14875 lines
520 KiB
Ada
14875 lines
520 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ C H 9 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Atree; use Atree;
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with Checks; use Checks;
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with Einfo; use Einfo;
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with Elists; use Elists;
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with Errout; use Errout;
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with Exp_Ch3; use Exp_Ch3;
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with Exp_Ch6; use Exp_Ch6;
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with Exp_Ch11; use Exp_Ch11;
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with Exp_Dbug; use Exp_Dbug;
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with Exp_Disp; use Exp_Disp;
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with Exp_Sel; use Exp_Sel;
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with Exp_Smem; use Exp_Smem;
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with Exp_Tss; use Exp_Tss;
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with Exp_Util; use Exp_Util;
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with Freeze; use Freeze;
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with Hostparm;
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with Itypes; use Itypes;
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with Namet; use Namet;
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with Nlists; use Nlists;
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with Nmake; use Nmake;
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with Opt; use Opt;
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with Restrict; use Restrict;
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with Rident; use Rident;
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with Rtsfind; use Rtsfind;
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with Sem; use Sem;
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with Sem_Aux; use Sem_Aux;
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with Sem_Ch6; use Sem_Ch6;
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with Sem_Ch8; use Sem_Ch8;
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with Sem_Ch9; use Sem_Ch9;
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with Sem_Ch11; use Sem_Ch11;
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with Sem_Elab; use Sem_Elab;
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with Sem_Eval; use Sem_Eval;
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with Sem_Res; use Sem_Res;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Snames; use Snames;
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with Stand; use Stand;
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with Stringt; use Stringt;
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with Targparm; use Targparm;
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with Tbuild; use Tbuild;
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with Uintp; use Uintp;
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package body Exp_Ch9 is
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-- The following constant establishes the upper bound for the index of
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-- an entry family. It is used to limit the allocated size of protected
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-- types with defaulted discriminant of an integer type, when the bound
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-- of some entry family depends on a discriminant. The limitation to entry
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-- families of 128K should be reasonable in all cases, and is a documented
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-- implementation restriction.
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Entry_Family_Bound : constant Pos := 2**16;
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-----------------------
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-- Local Subprograms --
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-----------------------
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function Actual_Index_Expression
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(Sloc : Source_Ptr;
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Ent : Entity_Id;
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Index : Node_Id;
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Tsk : Entity_Id) return Node_Id;
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-- Compute the index position for an entry call. Tsk is the target task. If
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-- the bounds of some entry family depend on discriminants, the expression
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-- computed by this function uses the discriminants of the target task.
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procedure Add_Object_Pointer
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(Loc : Source_Ptr;
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Conc_Typ : Entity_Id;
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Decls : List_Id);
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-- Prepend an object pointer declaration to the declaration list Decls.
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-- This object pointer is initialized to a type conversion of the System.
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-- Address pointer passed to entry barrier functions and entry body
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-- procedures.
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procedure Add_Formal_Renamings
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(Spec : Node_Id;
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Decls : List_Id;
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Ent : Entity_Id;
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Loc : Source_Ptr);
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-- Create renaming declarations for the formals, inside the procedure that
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-- implements an entry body. The renamings make the original names of the
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-- formals accessible to gdb, and serve no other purpose.
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-- Spec is the specification of the procedure being built.
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-- Decls is the list of declarations to be enhanced.
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-- Ent is the entity for the original entry body.
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function Build_Accept_Body (Astat : Node_Id) return Node_Id;
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-- Transform accept statement into a block with added exception handler.
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-- Used both for simple accept statements and for accept alternatives in
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-- select statements. Astat is the accept statement.
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function Build_Barrier_Function
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(N : Node_Id;
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Ent : Entity_Id;
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Pid : Node_Id) return Node_Id;
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-- Build the function body returning the value of the barrier expression
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-- for the specified entry body.
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function Build_Barrier_Function_Specification
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(Loc : Source_Ptr;
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Def_Id : Entity_Id) return Node_Id;
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-- Build a specification for a function implementing the protected entry
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-- barrier of the specified entry body.
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procedure Build_Contract_Wrapper (E : Entity_Id; Decl : Node_Id);
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-- Build the body of a wrapper procedure for an entry or entry family that
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-- has contract cases, preconditions, or postconditions. The body gathers
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-- the executable contract items and expands them in the usual way, and
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-- performs the entry call itself. This way preconditions are evaluated
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-- before the call is queued. E is the entry in question, and Decl is the
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-- enclosing synchronized type declaration at whose freeze point the
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-- generated body is analyzed.
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function Build_Corresponding_Record
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(N : Node_Id;
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Ctyp : Node_Id;
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Loc : Source_Ptr) return Node_Id;
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-- Common to tasks and protected types. Copy discriminant specifications,
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-- build record declaration. N is the type declaration, Ctyp is the
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-- concurrent entity (task type or protected type).
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function Build_Dispatching_Tag_Check
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(K : Entity_Id;
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N : Node_Id) return Node_Id;
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-- Utility to create the tree to check whether the dispatching call in
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-- a timed entry call, a conditional entry call, or an asynchronous
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-- transfer of control is a call to a primitive of a non-synchronized type.
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-- K is the temporary that holds the tagged kind of the target object, and
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-- N is the enclosing construct.
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function Build_Entry_Count_Expression
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(Concurrent_Type : Node_Id;
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Component_List : List_Id;
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Loc : Source_Ptr) return Node_Id;
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-- Compute number of entries for concurrent object. This is a count of
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-- simple entries, followed by an expression that computes the length
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-- of the range of each entry family. A single array with that size is
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-- allocated for each concurrent object of the type.
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function Build_Find_Body_Index (Typ : Entity_Id) return Node_Id;
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-- Build the function that translates the entry index in the call
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-- (which depends on the size of entry families) into an index into the
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-- Entry_Bodies_Array, to determine the body and barrier function used
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-- in a protected entry call. A pointer to this function appears in every
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-- protected object.
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function Build_Find_Body_Index_Spec (Typ : Entity_Id) return Node_Id;
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-- Build subprogram declaration for previous one
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function Build_Lock_Free_Protected_Subprogram_Body
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(N : Node_Id;
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Prot_Typ : Node_Id;
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Unprot_Spec : Node_Id) return Node_Id;
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-- N denotes a subprogram body of protected type Prot_Typ. Unprot_Spec is
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-- the subprogram specification of the unprotected version of N. Transform
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-- N such that it invokes the unprotected version of the body.
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function Build_Lock_Free_Unprotected_Subprogram_Body
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(N : Node_Id;
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Prot_Typ : Node_Id) return Node_Id;
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-- N denotes a subprogram body of protected type Prot_Typ. Build a version
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-- of N where the original statements of N are synchronized through atomic
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-- actions such as compare and exchange. Prior to invoking this routine, it
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-- has been established that N can be implemented in a lock-free fashion.
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function Build_Parameter_Block
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(Loc : Source_Ptr;
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Actuals : List_Id;
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Formals : List_Id;
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Decls : List_Id) return Entity_Id;
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-- Generate an access type for each actual parameter in the list Actuals.
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-- Create an encapsulating record that contains all the actuals and return
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-- its type. Generate:
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-- type Ann1 is access all <actual1-type>
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-- ...
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-- type AnnN is access all <actualN-type>
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-- type Pnn is record
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-- <formal1> : Ann1;
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-- ...
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-- <formalN> : AnnN;
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-- end record;
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function Build_Protected_Entry
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(N : Node_Id;
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Ent : Entity_Id;
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Pid : Node_Id) return Node_Id;
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-- Build the procedure implementing the statement sequence of the specified
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-- entry body.
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function Build_Protected_Entry_Specification
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(Loc : Source_Ptr;
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Def_Id : Entity_Id;
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Ent_Id : Entity_Id) return Node_Id;
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-- Build a specification for the procedure implementing the statements of
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-- the specified entry body. Add attributes associating it with the entry
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-- defining identifier Ent_Id.
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function Build_Protected_Spec
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(N : Node_Id;
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Obj_Type : Entity_Id;
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Ident : Entity_Id;
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Unprotected : Boolean := False) return List_Id;
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-- Utility shared by Build_Protected_Sub_Spec and Expand_Access_Protected_
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-- Subprogram_Type. Builds signature of protected subprogram, adding the
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-- formal that corresponds to the object itself. For an access to protected
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-- subprogram, there is no object type to specify, so the parameter has
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-- type Address and mode In. An indirect call through such a pointer will
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-- convert the address to a reference to the actual object. The object is
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-- a limited record and therefore a by_reference type.
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function Build_Protected_Subprogram_Body
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(N : Node_Id;
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Pid : Node_Id;
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N_Op_Spec : Node_Id) return Node_Id;
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-- This function is used to construct the protected version of a protected
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-- subprogram. Its statement sequence first defers abort, then locks the
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-- associated protected object, and then enters a block that contains a
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-- call to the unprotected version of the subprogram (for details, see
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-- Build_Unprotected_Subprogram_Body). This block statement requires a
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-- cleanup handler that unlocks the object in all cases. For details,
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-- see Exp_Ch7.Expand_Cleanup_Actions.
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function Build_Renamed_Formal_Declaration
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(New_F : Entity_Id;
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Formal : Entity_Id;
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Comp : Entity_Id;
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Renamed_Formal : Node_Id) return Node_Id;
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-- Create a renaming declaration for a formal, within a protected entry
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-- body or an accept body. The renamed object is a component of the
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-- parameter block that is a parameter in the entry call.
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--
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-- In Ada 2012, if the formal is an incomplete tagged type, the renaming
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-- does not dereference the corresponding component to prevent an illegal
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-- use of the incomplete type (AI05-0151).
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function Build_Selected_Name
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(Prefix : Entity_Id;
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Selector : Entity_Id;
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Append_Char : Character := ' ') return Name_Id;
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-- Build a name in the form of Prefix__Selector, with an optional character
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-- appended. This is used for internal subprograms generated for operations
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-- of protected types, including barrier functions. For the subprograms
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-- generated for entry bodies and entry barriers, the generated name
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-- includes a sequence number that makes names unique in the presence of
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-- entry overloading. This is necessary because entry body procedures and
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-- barrier functions all have the same signature.
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procedure Build_Simple_Entry_Call
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(N : Node_Id;
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Concval : Node_Id;
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Ename : Node_Id;
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Index : Node_Id);
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-- Some comments here would be useful ???
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function Build_Task_Proc_Specification (T : Entity_Id) return Node_Id;
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-- This routine constructs a specification for the procedure that we will
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-- build for the task body for task type T. The spec has the form:
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--
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-- procedure tnameB (_Task : access tnameV);
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--
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-- where name is the character name taken from the task type entity that
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-- is passed as the argument to the procedure, and tnameV is the task
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-- value type that is associated with the task type.
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function Build_Unprotected_Subprogram_Body
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(N : Node_Id;
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Pid : Node_Id) return Node_Id;
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-- This routine constructs the unprotected version of a protected
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-- subprogram body, which is contains all of the code in the original,
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-- unexpanded body. This is the version of the protected subprogram that is
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-- called from all protected operations on the same object, including the
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-- protected version of the same subprogram.
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procedure Build_Wrapper_Bodies
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(Loc : Source_Ptr;
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Typ : Entity_Id;
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N : Node_Id);
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-- Ada 2005 (AI-345): Typ is either a concurrent type or the corresponding
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-- record of a concurrent type. N is the insertion node where all bodies
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-- will be placed. This routine builds the bodies of the subprograms which
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-- serve as an indirection mechanism to overriding primitives of concurrent
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-- types, entries and protected procedures. Any new body is analyzed.
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procedure Build_Wrapper_Specs
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(Loc : Source_Ptr;
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Typ : Entity_Id;
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N : in out Node_Id);
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-- Ada 2005 (AI-345): Typ is either a concurrent type or the corresponding
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-- record of a concurrent type. N is the insertion node where all specs
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-- will be placed. This routine builds the specs of the subprograms which
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-- serve as an indirection mechanism to overriding primitives of concurrent
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-- types, entries and protected procedures. Any new spec is analyzed.
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procedure Collect_Entry_Families
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(Loc : Source_Ptr;
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Cdecls : List_Id;
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Current_Node : in out Node_Id;
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Conctyp : Entity_Id);
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-- For each entry family in a concurrent type, create an anonymous array
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-- type of the right size, and add a component to the corresponding_record.
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function Concurrent_Object
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(Spec_Id : Entity_Id;
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Conc_Typ : Entity_Id) return Entity_Id;
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-- Given a subprogram entity Spec_Id and concurrent type Conc_Typ, return
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-- the entity associated with the concurrent object in the Protected_Body_
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-- Subprogram or the Task_Body_Procedure of Spec_Id. The returned entity
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-- denotes formal parameter _O, _object or _task.
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function Copy_Result_Type (Res : Node_Id) return Node_Id;
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-- Copy the result type of a function specification, when building the
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-- internal operation corresponding to a protected function, or when
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-- expanding an access to protected function. If the result is an anonymous
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-- access to subprogram itself, we need to create a new signature with the
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-- same parameter names and the same resolved types, but with new entities
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-- for the formals.
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procedure Debug_Private_Data_Declarations (Decls : List_Id);
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-- Decls is a list which may contain the declarations created by Install_
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-- Private_Data_Declarations. All generated entities are marked as needing
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-- debug info and debug nodes are manually generation where necessary. This
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-- step of the expansion must to be done after private data has been moved
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-- to its final resting scope to ensure proper visibility of debug objects.
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procedure Ensure_Statement_Present (Loc : Source_Ptr; Alt : Node_Id);
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-- If control flow optimizations are suppressed, and Alt is an accept,
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-- delay, or entry call alternative with no trailing statements, insert
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-- a null trailing statement with the given Loc (which is the sloc of
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-- the accept, delay, or entry call statement). There might not be any
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-- generated code for the accept, delay, or entry call itself (the effect
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-- of these statements is part of the general processsing done for the
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-- enclosing selective accept, timed entry call, or asynchronous select),
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-- and the null statement is there to carry the sloc of that statement to
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-- the back-end for trace-based coverage analysis purposes.
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procedure Extract_Dispatching_Call
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(N : Node_Id;
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Call_Ent : out Entity_Id;
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Object : out Entity_Id;
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Actuals : out List_Id;
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Formals : out List_Id);
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-- Given a dispatching call, extract the entity of the name of the call,
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-- its actual dispatching object, its actual parameters and the formal
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-- parameters of the overridden interface-level version. If the type of
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-- the dispatching object is an access type then an explicit dereference
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-- is returned in Object.
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procedure Extract_Entry
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(N : Node_Id;
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Concval : out Node_Id;
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Ename : out Node_Id;
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Index : out Node_Id);
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-- Given an entry call, returns the associated concurrent object, the entry
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-- name, and the entry family index.
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function Family_Offset
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(Loc : Source_Ptr;
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Hi : Node_Id;
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Lo : Node_Id;
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Ttyp : Entity_Id;
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Cap : Boolean) return Node_Id;
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-- Compute (Hi - Lo) for two entry family indexes. Hi is the index in an
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-- accept statement, or the upper bound in the discrete subtype of an entry
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-- declaration. Lo is the corresponding lower bound. Ttyp is the concurrent
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-- type of the entry. If Cap is true, the result is capped according to
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-- Entry_Family_Bound.
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function Family_Size
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(Loc : Source_Ptr;
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Hi : Node_Id;
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Lo : Node_Id;
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Ttyp : Entity_Id;
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Cap : Boolean) return Node_Id;
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-- Compute (Hi - Lo) + 1 Max 0, to determine the number of entries in a
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-- family, and handle properly the superflat case. This is equivalent to
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-- the use of 'Length on the index type, but must use Family_Offset to
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-- handle properly the case of bounds that depend on discriminants. If
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-- Cap is true, the result is capped according to Entry_Family_Bound.
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procedure Find_Enclosing_Context
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(N : Node_Id;
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Context : out Node_Id;
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Context_Id : out Entity_Id;
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Context_Decls : out List_Id);
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-- Subsidiary routine to procedures Build_Activation_Chain_Entity and
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-- Build_Master_Entity. Given an arbitrary node in the tree, find the
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-- nearest enclosing body, block, package, or return statement and return
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-- its constituents. Context is the enclosing construct, Context_Id is
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-- the scope of Context_Id and Context_Decls is the declarative list of
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-- Context.
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function Index_Object (Spec_Id : Entity_Id) return Entity_Id;
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-- Given a subprogram identifier, return the entity which is associated
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-- with the protection entry index in the Protected_Body_Subprogram or
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-- the Task_Body_Procedure of Spec_Id. The returned entity denotes formal
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-- parameter _E.
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function Is_Exception_Safe (Subprogram : Node_Id) return Boolean;
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-- Tell whether a given subprogram cannot raise an exception
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function Is_Potentially_Large_Family
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(Base_Index : Entity_Id;
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Conctyp : Entity_Id;
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Lo : Node_Id;
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Hi : Node_Id) return Boolean;
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function Is_Private_Primitive_Subprogram (Id : Entity_Id) return Boolean;
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-- Determine whether Id is a function or a procedure and is marked as a
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-- private primitive.
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function Null_Statements (Stats : List_Id) return Boolean;
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-- Used to check DO-END sequence. Checks for equivalent of DO NULL; END.
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-- Allows labels, and pragma Warnings/Unreferenced in the sequence as well
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-- to still count as null. Returns True for a null sequence. The argument
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-- is the list of statements from the DO-END sequence.
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function Parameter_Block_Pack
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(Loc : Source_Ptr;
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Blk_Typ : Entity_Id;
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Actuals : List_Id;
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Formals : List_Id;
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Decls : List_Id;
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Stmts : List_Id) return Entity_Id;
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-- Set the components of the generated parameter block with the values
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-- of the actual parameters. Generate aliased temporaries to capture the
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-- values for types that are passed by copy. Otherwise generate a reference
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-- to the actual's value. Return the address of the aggregate block.
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-- Generate:
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-- Jnn1 : alias <formal-type1>;
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-- Jnn1 := <actual1>;
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-- ...
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-- P : Blk_Typ := (
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-- Jnn1'unchecked_access;
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-- <actual2>'reference;
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-- ...);
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function Parameter_Block_Unpack
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(Loc : Source_Ptr;
|
|
P : Entity_Id;
|
|
Actuals : List_Id;
|
|
Formals : List_Id) return List_Id;
|
|
-- Retrieve the values of the components from the parameter block and
|
|
-- assign then to the original actual parameters. Generate:
|
|
-- <actual1> := P.<formal1>;
|
|
-- ...
|
|
-- <actualN> := P.<formalN>;
|
|
|
|
function Trivial_Accept_OK return Boolean;
|
|
-- If there is no DO-END block for an accept, or if the DO-END block has
|
|
-- only null statements, then it is possible to do the Rendezvous with much
|
|
-- less overhead using the Accept_Trivial routine in the run-time library.
|
|
-- However, this is not always a valid optimization. Whether it is valid or
|
|
-- not depends on the Task_Dispatching_Policy. The issue is whether a full
|
|
-- rescheduling action is required or not. In FIFO_Within_Priorities, such
|
|
-- a rescheduling is required, so this optimization is not allowed. This
|
|
-- function returns True if the optimization is permitted.
|
|
|
|
-----------------------------
|
|
-- Actual_Index_Expression --
|
|
-----------------------------
|
|
|
|
function Actual_Index_Expression
|
|
(Sloc : Source_Ptr;
|
|
Ent : Entity_Id;
|
|
Index : Node_Id;
|
|
Tsk : Entity_Id) return Node_Id
|
|
is
|
|
Ttyp : constant Entity_Id := Etype (Tsk);
|
|
Expr : Node_Id;
|
|
Num : Node_Id;
|
|
Lo : Node_Id;
|
|
Hi : Node_Id;
|
|
Prev : Entity_Id;
|
|
S : Node_Id;
|
|
|
|
function Actual_Family_Offset (Hi, Lo : Node_Id) return Node_Id;
|
|
-- Compute difference between bounds of entry family
|
|
|
|
--------------------------
|
|
-- Actual_Family_Offset --
|
|
--------------------------
|
|
|
|
function Actual_Family_Offset (Hi, Lo : Node_Id) return Node_Id is
|
|
|
|
function Actual_Discriminant_Ref (Bound : Node_Id) return Node_Id;
|
|
-- Replace a reference to a discriminant with a selected component
|
|
-- denoting the discriminant of the target task.
|
|
|
|
-----------------------------
|
|
-- Actual_Discriminant_Ref --
|
|
-----------------------------
|
|
|
|
function Actual_Discriminant_Ref (Bound : Node_Id) return Node_Id is
|
|
Typ : constant Entity_Id := Etype (Bound);
|
|
B : Node_Id;
|
|
|
|
begin
|
|
if not Is_Entity_Name (Bound)
|
|
or else Ekind (Entity (Bound)) /= E_Discriminant
|
|
then
|
|
if Nkind (Bound) = N_Attribute_Reference then
|
|
return Bound;
|
|
else
|
|
B := New_Copy_Tree (Bound);
|
|
end if;
|
|
|
|
else
|
|
B :=
|
|
Make_Selected_Component (Sloc,
|
|
Prefix => New_Copy_Tree (Tsk),
|
|
Selector_Name => New_Occurrence_Of (Entity (Bound), Sloc));
|
|
|
|
Analyze_And_Resolve (B, Typ);
|
|
end if;
|
|
|
|
return
|
|
Make_Attribute_Reference (Sloc,
|
|
Attribute_Name => Name_Pos,
|
|
Prefix => New_Occurrence_Of (Etype (Bound), Sloc),
|
|
Expressions => New_List (B));
|
|
end Actual_Discriminant_Ref;
|
|
|
|
-- Start of processing for Actual_Family_Offset
|
|
|
|
begin
|
|
return
|
|
Make_Op_Subtract (Sloc,
|
|
Left_Opnd => Actual_Discriminant_Ref (Hi),
|
|
Right_Opnd => Actual_Discriminant_Ref (Lo));
|
|
end Actual_Family_Offset;
|
|
|
|
-- Start of processing for Actual_Index_Expression
|
|
|
|
begin
|
|
-- The queues of entries and entry families appear in textual order in
|
|
-- the associated record. The entry index is computed as the sum of the
|
|
-- number of queues for all entries that precede the designated one, to
|
|
-- which is added the index expression, if this expression denotes a
|
|
-- member of a family.
|
|
|
|
-- The following is a place holder for the count of simple entries
|
|
|
|
Num := Make_Integer_Literal (Sloc, 1);
|
|
|
|
-- We construct an expression which is a series of addition operations.
|
|
-- See comments in Entry_Index_Expression, which is identical in
|
|
-- structure.
|
|
|
|
if Present (Index) then
|
|
S := Etype (Discrete_Subtype_Definition (Declaration_Node (Ent)));
|
|
|
|
Expr :=
|
|
Make_Op_Add (Sloc,
|
|
Left_Opnd => Num,
|
|
Right_Opnd =>
|
|
Actual_Family_Offset (
|
|
Make_Attribute_Reference (Sloc,
|
|
Attribute_Name => Name_Pos,
|
|
Prefix => New_Occurrence_Of (Base_Type (S), Sloc),
|
|
Expressions => New_List (Relocate_Node (Index))),
|
|
Type_Low_Bound (S)));
|
|
else
|
|
Expr := Num;
|
|
end if;
|
|
|
|
-- Now add lengths of preceding entries and entry families
|
|
|
|
Prev := First_Entity (Ttyp);
|
|
while Chars (Prev) /= Chars (Ent)
|
|
or else (Ekind (Prev) /= Ekind (Ent))
|
|
or else not Sem_Ch6.Type_Conformant (Ent, Prev)
|
|
loop
|
|
if Ekind (Prev) = E_Entry then
|
|
Set_Intval (Num, Intval (Num) + 1);
|
|
|
|
elsif Ekind (Prev) = E_Entry_Family then
|
|
S :=
|
|
Etype (Discrete_Subtype_Definition (Declaration_Node (Prev)));
|
|
|
|
-- The need for the following full view retrieval stems from this
|
|
-- complex case of nested generics and tasking:
|
|
|
|
-- generic
|
|
-- type Formal_Index is range <>;
|
|
-- ...
|
|
-- package Outer is
|
|
-- type Index is private;
|
|
-- generic
|
|
-- ...
|
|
-- package Inner is
|
|
-- procedure P;
|
|
-- end Inner;
|
|
-- private
|
|
-- type Index is new Formal_Index range 1 .. 10;
|
|
-- end Outer;
|
|
|
|
-- package body Outer is
|
|
-- task type T is
|
|
-- entry Fam (Index); -- (2)
|
|
-- entry E;
|
|
-- end T;
|
|
-- package body Inner is -- (3)
|
|
-- procedure P is
|
|
-- begin
|
|
-- T.E; -- (1)
|
|
-- end P;
|
|
-- end Inner;
|
|
-- ...
|
|
|
|
-- We are currently building the index expression for the entry
|
|
-- call "T.E" (1). Part of the expansion must mention the range
|
|
-- of the discrete type "Index" (2) of entry family "Fam".
|
|
|
|
-- However only the private view of type "Index" is available to
|
|
-- the inner generic (3) because there was no prior mention of
|
|
-- the type inside "Inner". This visibility requirement is
|
|
-- implicit and cannot be detected during the construction of
|
|
-- the generic trees and needs special handling.
|
|
|
|
if In_Instance_Body
|
|
and then Is_Private_Type (S)
|
|
and then Present (Full_View (S))
|
|
then
|
|
S := Full_View (S);
|
|
end if;
|
|
|
|
Lo := Type_Low_Bound (S);
|
|
Hi := Type_High_Bound (S);
|
|
|
|
Expr :=
|
|
Make_Op_Add (Sloc,
|
|
Left_Opnd => Expr,
|
|
Right_Opnd =>
|
|
Make_Op_Add (Sloc,
|
|
Left_Opnd => Actual_Family_Offset (Hi, Lo),
|
|
Right_Opnd => Make_Integer_Literal (Sloc, 1)));
|
|
|
|
-- Other components are anonymous types to be ignored
|
|
|
|
else
|
|
null;
|
|
end if;
|
|
|
|
Next_Entity (Prev);
|
|
end loop;
|
|
|
|
return Expr;
|
|
end Actual_Index_Expression;
|
|
|
|
--------------------------
|
|
-- Add_Formal_Renamings --
|
|
--------------------------
|
|
|
|
procedure Add_Formal_Renamings
|
|
(Spec : Node_Id;
|
|
Decls : List_Id;
|
|
Ent : Entity_Id;
|
|
Loc : Source_Ptr)
|
|
is
|
|
Ptr : constant Entity_Id :=
|
|
Defining_Identifier
|
|
(Next (First (Parameter_Specifications (Spec))));
|
|
-- The name of the formal that holds the address of the parameter block
|
|
-- for the call.
|
|
|
|
Comp : Entity_Id;
|
|
Decl : Node_Id;
|
|
Formal : Entity_Id;
|
|
New_F : Entity_Id;
|
|
Renamed_Formal : Node_Id;
|
|
|
|
begin
|
|
Formal := First_Formal (Ent);
|
|
while Present (Formal) loop
|
|
Comp := Entry_Component (Formal);
|
|
New_F :=
|
|
Make_Defining_Identifier (Sloc (Formal),
|
|
Chars => Chars (Formal));
|
|
Set_Etype (New_F, Etype (Formal));
|
|
Set_Scope (New_F, Ent);
|
|
|
|
-- Now we set debug info needed on New_F even though it does not come
|
|
-- from source, so that the debugger will get the right information
|
|
-- for these generated names.
|
|
|
|
Set_Debug_Info_Needed (New_F);
|
|
|
|
if Ekind (Formal) = E_In_Parameter then
|
|
Set_Ekind (New_F, E_Constant);
|
|
else
|
|
Set_Ekind (New_F, E_Variable);
|
|
Set_Extra_Constrained (New_F, Extra_Constrained (Formal));
|
|
end if;
|
|
|
|
Set_Actual_Subtype (New_F, Actual_Subtype (Formal));
|
|
|
|
Renamed_Formal :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (Entry_Parameters_Type (Ent),
|
|
Make_Identifier (Loc, Chars (Ptr))),
|
|
Selector_Name => New_Occurrence_Of (Comp, Loc));
|
|
|
|
Decl :=
|
|
Build_Renamed_Formal_Declaration
|
|
(New_F, Formal, Comp, Renamed_Formal);
|
|
|
|
Append (Decl, Decls);
|
|
Set_Renamed_Object (Formal, New_F);
|
|
Next_Formal (Formal);
|
|
end loop;
|
|
end Add_Formal_Renamings;
|
|
|
|
------------------------
|
|
-- Add_Object_Pointer --
|
|
------------------------
|
|
|
|
procedure Add_Object_Pointer
|
|
(Loc : Source_Ptr;
|
|
Conc_Typ : Entity_Id;
|
|
Decls : List_Id)
|
|
is
|
|
Rec_Typ : constant Entity_Id := Corresponding_Record_Type (Conc_Typ);
|
|
Decl : Node_Id;
|
|
Obj_Ptr : Node_Id;
|
|
|
|
begin
|
|
-- Create the renaming declaration for the Protection object of a
|
|
-- protected type. _Object is used by Complete_Entry_Body.
|
|
-- ??? An attempt to make this a renaming was unsuccessful.
|
|
|
|
-- Build the entity for the access type
|
|
|
|
Obj_Ptr :=
|
|
Make_Defining_Identifier (Loc,
|
|
New_External_Name (Chars (Rec_Typ), 'P'));
|
|
|
|
-- Generate:
|
|
-- _object : poVP := poVP!O;
|
|
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Make_Defining_Identifier (Loc, Name_uObject),
|
|
Object_Definition => New_Occurrence_Of (Obj_Ptr, Loc),
|
|
Expression =>
|
|
Unchecked_Convert_To (Obj_Ptr, Make_Identifier (Loc, Name_uO)));
|
|
Set_Debug_Info_Needed (Defining_Identifier (Decl));
|
|
Prepend_To (Decls, Decl);
|
|
|
|
-- Generate:
|
|
-- type poVP is access poV;
|
|
|
|
Decl :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Obj_Ptr,
|
|
Type_Definition =>
|
|
Make_Access_To_Object_Definition (Loc,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (Rec_Typ, Loc)));
|
|
Set_Debug_Info_Needed (Defining_Identifier (Decl));
|
|
Prepend_To (Decls, Decl);
|
|
end Add_Object_Pointer;
|
|
|
|
-----------------------
|
|
-- Build_Accept_Body --
|
|
-----------------------
|
|
|
|
function Build_Accept_Body (Astat : Node_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (Astat);
|
|
Stats : constant Node_Id := Handled_Statement_Sequence (Astat);
|
|
New_S : Node_Id;
|
|
Hand : Node_Id;
|
|
Call : Node_Id;
|
|
Ohandle : Node_Id;
|
|
|
|
begin
|
|
-- At the end of the statement sequence, Complete_Rendezvous is called.
|
|
-- A label skipping the Complete_Rendezvous, and all other accept
|
|
-- processing, has already been added for the expansion of requeue
|
|
-- statements. The Sloc is copied from the last statement since it
|
|
-- is really part of this last statement.
|
|
|
|
Call :=
|
|
Build_Runtime_Call
|
|
(Sloc (Last (Statements (Stats))), RE_Complete_Rendezvous);
|
|
Insert_Before (Last (Statements (Stats)), Call);
|
|
Analyze (Call);
|
|
|
|
-- If exception handlers are present, then append Complete_Rendezvous
|
|
-- calls to the handlers, and construct the required outer block. As
|
|
-- above, the Sloc is copied from the last statement in the sequence.
|
|
|
|
if Present (Exception_Handlers (Stats)) then
|
|
Hand := First (Exception_Handlers (Stats));
|
|
while Present (Hand) loop
|
|
Call :=
|
|
Build_Runtime_Call
|
|
(Sloc (Last (Statements (Hand))), RE_Complete_Rendezvous);
|
|
Append (Call, Statements (Hand));
|
|
Analyze (Call);
|
|
Next (Hand);
|
|
end loop;
|
|
|
|
New_S :=
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (
|
|
Make_Block_Statement (Loc,
|
|
Handled_Statement_Sequence => Stats)));
|
|
|
|
else
|
|
New_S := Stats;
|
|
end if;
|
|
|
|
-- At this stage we know that the new statement sequence does
|
|
-- not have an exception handler part, so we supply one to call
|
|
-- Exceptional_Complete_Rendezvous. This handler is
|
|
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
|
|
|
|
-- We handle Abort_Signal to make sure that we properly catch the abort
|
|
-- case and wake up the caller.
|
|
|
|
Ohandle := Make_Others_Choice (Loc);
|
|
Set_All_Others (Ohandle);
|
|
|
|
Set_Exception_Handlers (New_S,
|
|
New_List (
|
|
Make_Implicit_Exception_Handler (Loc,
|
|
Exception_Choices => New_List (Ohandle),
|
|
|
|
Statements => New_List (
|
|
Make_Procedure_Call_Statement (Sloc (Stats),
|
|
Name => New_Occurrence_Of (
|
|
RTE (RE_Exceptional_Complete_Rendezvous), Sloc (Stats)),
|
|
Parameter_Associations => New_List (
|
|
Make_Function_Call (Sloc (Stats),
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Get_GNAT_Exception), Sloc (Stats)))))))));
|
|
|
|
Set_Parent (New_S, Astat); -- temp parent for Analyze call
|
|
Analyze_Exception_Handlers (Exception_Handlers (New_S));
|
|
Expand_Exception_Handlers (New_S);
|
|
|
|
-- Exceptional_Complete_Rendezvous must be called with abort still
|
|
-- deferred, which is the case for a "when all others" handler.
|
|
|
|
return New_S;
|
|
end Build_Accept_Body;
|
|
|
|
-----------------------------------
|
|
-- Build_Activation_Chain_Entity --
|
|
-----------------------------------
|
|
|
|
procedure Build_Activation_Chain_Entity (N : Node_Id) is
|
|
function Has_Activation_Chain (Stmt : Node_Id) return Boolean;
|
|
-- Determine whether an extended return statement has activation chain
|
|
|
|
--------------------------
|
|
-- Has_Activation_Chain --
|
|
--------------------------
|
|
|
|
function Has_Activation_Chain (Stmt : Node_Id) return Boolean is
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
Decl := First (Return_Object_Declarations (Stmt));
|
|
while Present (Decl) loop
|
|
if Nkind (Decl) = N_Object_Declaration
|
|
and then Chars (Defining_Identifier (Decl)) = Name_uChain
|
|
then
|
|
return True;
|
|
end if;
|
|
|
|
Next (Decl);
|
|
end loop;
|
|
|
|
return False;
|
|
end Has_Activation_Chain;
|
|
|
|
-- Local variables
|
|
|
|
Context : Node_Id;
|
|
Context_Id : Entity_Id;
|
|
Decls : List_Id;
|
|
|
|
-- Start of processing for Build_Activation_Chain_Entity
|
|
|
|
begin
|
|
-- Activation chain is never used for sequential elaboration policy, see
|
|
-- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
|
|
|
|
if Partition_Elaboration_Policy = 'S' then
|
|
return;
|
|
end if;
|
|
|
|
Find_Enclosing_Context (N, Context, Context_Id, Decls);
|
|
|
|
-- If activation chain entity has not been declared already, create one
|
|
|
|
if Nkind (Context) = N_Extended_Return_Statement
|
|
or else No (Activation_Chain_Entity (Context))
|
|
then
|
|
-- Since extended return statements do not store the entity of the
|
|
-- chain, examine the return object declarations to avoid creating
|
|
-- a duplicate.
|
|
|
|
if Nkind (Context) = N_Extended_Return_Statement
|
|
and then Has_Activation_Chain (Context)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
declare
|
|
Loc : constant Source_Ptr := Sloc (Context);
|
|
Chain : Entity_Id;
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
Chain := Make_Defining_Identifier (Sloc (N), Name_uChain);
|
|
|
|
-- Note: An extended return statement is not really a task
|
|
-- activator, but it does have an activation chain on which to
|
|
-- store the tasks temporarily. On successful return, the tasks
|
|
-- on this chain are moved to the chain passed in by the caller.
|
|
-- We do not build an Activation_Chain_Entity for an extended
|
|
-- return statement, because we do not want to build a call to
|
|
-- Activate_Tasks. Task activation is the responsibility of the
|
|
-- caller.
|
|
|
|
if Nkind (Context) /= N_Extended_Return_Statement then
|
|
Set_Activation_Chain_Entity (Context, Chain);
|
|
end if;
|
|
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Chain,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Activation_Chain), Loc));
|
|
|
|
Prepend_To (Decls, Decl);
|
|
|
|
-- Ensure that _chain appears in the proper scope of the context
|
|
|
|
if Context_Id /= Current_Scope then
|
|
Push_Scope (Context_Id);
|
|
Analyze (Decl);
|
|
Pop_Scope;
|
|
else
|
|
Analyze (Decl);
|
|
end if;
|
|
end;
|
|
end if;
|
|
end Build_Activation_Chain_Entity;
|
|
|
|
----------------------------
|
|
-- Build_Barrier_Function --
|
|
----------------------------
|
|
|
|
function Build_Barrier_Function
|
|
(N : Node_Id;
|
|
Ent : Entity_Id;
|
|
Pid : Node_Id) return Node_Id
|
|
is
|
|
Ent_Formals : constant Node_Id := Entry_Body_Formal_Part (N);
|
|
Cond : constant Node_Id := Condition (Ent_Formals);
|
|
Loc : constant Source_Ptr := Sloc (Cond);
|
|
Func_Id : constant Entity_Id := Barrier_Function (Ent);
|
|
Op_Decls : constant List_Id := New_List;
|
|
Stmt : Node_Id;
|
|
Func_Body : Node_Id;
|
|
|
|
begin
|
|
-- Add a declaration for the Protection object, renaming declarations
|
|
-- for the discriminals and privals and finally a declaration for the
|
|
-- entry family index (if applicable).
|
|
|
|
Install_Private_Data_Declarations (Sloc (N),
|
|
Spec_Id => Func_Id,
|
|
Conc_Typ => Pid,
|
|
Body_Nod => N,
|
|
Decls => Op_Decls,
|
|
Barrier => True,
|
|
Family => Ekind (Ent) = E_Entry_Family);
|
|
|
|
-- If compiling with -fpreserve-control-flow, make sure we insert an
|
|
-- IF statement so that the back-end knows to generate a conditional
|
|
-- branch instruction, even if the condition is just the name of a
|
|
-- boolean object. Note that Expand_N_If_Statement knows to preserve
|
|
-- such redundant IF statements under -fpreserve-control-flow
|
|
-- (whether coming from this routine, or directly from source).
|
|
|
|
if Opt.Suppress_Control_Flow_Optimizations then
|
|
Stmt :=
|
|
Make_Implicit_If_Statement (Cond,
|
|
Condition => Cond,
|
|
Then_Statements => New_List (
|
|
Make_Simple_Return_Statement (Loc,
|
|
New_Occurrence_Of (Standard_True, Loc))),
|
|
|
|
Else_Statements => New_List (
|
|
Make_Simple_Return_Statement (Loc,
|
|
New_Occurrence_Of (Standard_False, Loc))));
|
|
|
|
else
|
|
Stmt := Make_Simple_Return_Statement (Loc, Cond);
|
|
end if;
|
|
|
|
-- Note: the condition in the barrier function needs to be properly
|
|
-- processed for the C/Fortran boolean possibility, but this happens
|
|
-- automatically since the return statement does this normalization.
|
|
|
|
Func_Body :=
|
|
Make_Subprogram_Body (Loc,
|
|
Specification =>
|
|
Build_Barrier_Function_Specification (Loc,
|
|
Make_Defining_Identifier (Loc, Chars (Func_Id))),
|
|
Declarations => Op_Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Stmt)));
|
|
Set_Is_Entry_Barrier_Function (Func_Body);
|
|
|
|
return Func_Body;
|
|
end Build_Barrier_Function;
|
|
|
|
------------------------------------------
|
|
-- Build_Barrier_Function_Specification --
|
|
------------------------------------------
|
|
|
|
function Build_Barrier_Function_Specification
|
|
(Loc : Source_Ptr;
|
|
Def_Id : Entity_Id) return Node_Id
|
|
is
|
|
begin
|
|
Set_Debug_Info_Needed (Def_Id);
|
|
|
|
return
|
|
Make_Function_Specification (Loc,
|
|
Defining_Unit_Name => Def_Id,
|
|
Parameter_Specifications => New_List (
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uO),
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc)),
|
|
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uE),
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Protected_Entry_Index), Loc))),
|
|
|
|
Result_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc));
|
|
end Build_Barrier_Function_Specification;
|
|
|
|
--------------------------
|
|
-- Build_Call_With_Task --
|
|
--------------------------
|
|
|
|
function Build_Call_With_Task
|
|
(N : Node_Id;
|
|
E : Entity_Id) return Node_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
begin
|
|
return
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (E, Loc),
|
|
Parameter_Associations => New_List (Concurrent_Ref (N)));
|
|
end Build_Call_With_Task;
|
|
|
|
-----------------------------
|
|
-- Build_Class_Wide_Master --
|
|
-----------------------------
|
|
|
|
procedure Build_Class_Wide_Master (Typ : Entity_Id) is
|
|
Loc : constant Source_Ptr := Sloc (Typ);
|
|
Master_Decl : Node_Id;
|
|
Master_Id : Entity_Id;
|
|
Master_Scope : Entity_Id;
|
|
Name_Id : Node_Id;
|
|
Related_Node : Node_Id;
|
|
Ren_Decl : Node_Id;
|
|
|
|
begin
|
|
-- Nothing to do if there is no task hierarchy
|
|
|
|
if Restriction_Active (No_Task_Hierarchy) then
|
|
return;
|
|
end if;
|
|
|
|
-- Find the declaration that created the access type, which is either a
|
|
-- type declaration, or an object declaration with an access definition,
|
|
-- in which case the type is anonymous.
|
|
|
|
if Is_Itype (Typ) then
|
|
Related_Node := Associated_Node_For_Itype (Typ);
|
|
else
|
|
Related_Node := Parent (Typ);
|
|
end if;
|
|
|
|
Master_Scope := Find_Master_Scope (Typ);
|
|
|
|
-- Nothing to do if the master scope already contains a _master entity.
|
|
-- The only exception to this is the following scenario:
|
|
|
|
-- Source_Scope
|
|
-- Transient_Scope_1
|
|
-- _master
|
|
|
|
-- Transient_Scope_2
|
|
-- use of master
|
|
|
|
-- In this case the source scope is marked as having the master entity
|
|
-- even though the actual declaration appears inside an inner scope. If
|
|
-- the second transient scope requires a _master, it cannot use the one
|
|
-- already declared because the entity is not visible.
|
|
|
|
Name_Id := Make_Identifier (Loc, Name_uMaster);
|
|
Master_Decl := Empty;
|
|
|
|
if not Has_Master_Entity (Master_Scope)
|
|
or else No (Current_Entity_In_Scope (Name_Id))
|
|
then
|
|
begin
|
|
Set_Has_Master_Entity (Master_Scope);
|
|
|
|
-- Generate:
|
|
-- _master : constant Integer := Current_Master.all;
|
|
|
|
Master_Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uMaster),
|
|
Constant_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Integer, Loc),
|
|
Expression =>
|
|
Make_Explicit_Dereference (Loc,
|
|
New_Occurrence_Of (RTE (RE_Current_Master), Loc)));
|
|
|
|
Insert_Action (Find_Hook_Context (Related_Node), Master_Decl);
|
|
Analyze (Master_Decl);
|
|
|
|
-- Mark the containing scope as a task master. Masters associated
|
|
-- with return statements are already marked at this stage (see
|
|
-- Analyze_Subprogram_Body).
|
|
|
|
if Ekind (Current_Scope) /= E_Return_Statement then
|
|
declare
|
|
Par : Node_Id := Related_Node;
|
|
|
|
begin
|
|
while Nkind (Par) /= N_Compilation_Unit loop
|
|
Par := Parent (Par);
|
|
|
|
-- If we fall off the top, we are at the outer level,
|
|
-- and the environment task is our effective master,
|
|
-- so nothing to mark.
|
|
|
|
if Nkind_In (Par, N_Block_Statement,
|
|
N_Subprogram_Body,
|
|
N_Task_Body)
|
|
then
|
|
Set_Is_Task_Master (Par);
|
|
exit;
|
|
end if;
|
|
end loop;
|
|
end;
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
Master_Id :=
|
|
Make_Defining_Identifier (Loc, New_External_Name (Chars (Typ), 'M'));
|
|
|
|
-- Generate:
|
|
-- typeMnn renames _master;
|
|
|
|
Ren_Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => Master_Id,
|
|
Subtype_Mark => New_Occurrence_Of (Standard_Integer, Loc),
|
|
Name => Name_Id);
|
|
|
|
-- If the master is declared locally, add the renaming declaration
|
|
-- immediately after it, to prevent access-before-elaboration in the
|
|
-- back-end.
|
|
|
|
if Present (Master_Decl) then
|
|
Insert_After (Master_Decl, Ren_Decl);
|
|
Analyze (Ren_Decl);
|
|
|
|
else
|
|
Insert_Action (Related_Node, Ren_Decl);
|
|
end if;
|
|
|
|
Set_Master_Id (Typ, Master_Id);
|
|
end Build_Class_Wide_Master;
|
|
|
|
----------------------------
|
|
-- Build_Contract_Wrapper --
|
|
----------------------------
|
|
|
|
procedure Build_Contract_Wrapper (E : Entity_Id; Decl : Node_Id) is
|
|
Conc_Typ : constant Entity_Id := Scope (E);
|
|
Loc : constant Source_Ptr := Sloc (E);
|
|
|
|
procedure Add_Discriminant_Renamings
|
|
(Obj_Id : Entity_Id;
|
|
Decls : List_Id);
|
|
-- Add renaming declarations for all discriminants of concurrent type
|
|
-- Conc_Typ. Obj_Id is the entity of the wrapper formal parameter which
|
|
-- represents the concurrent object.
|
|
|
|
procedure Add_Matching_Formals
|
|
(Formals : List_Id;
|
|
Actuals : in out List_Id);
|
|
-- Add formal parameters that match those of entry E to list Formals.
|
|
-- The routine also adds matching actuals for the new formals to list
|
|
-- Actuals.
|
|
|
|
procedure Transfer_Pragma (Prag : Node_Id; To : in out List_Id);
|
|
-- Relocate pragma Prag to list To. The routine creates a new list if
|
|
-- To does not exist.
|
|
|
|
--------------------------------
|
|
-- Add_Discriminant_Renamings --
|
|
--------------------------------
|
|
|
|
procedure Add_Discriminant_Renamings
|
|
(Obj_Id : Entity_Id;
|
|
Decls : List_Id)
|
|
is
|
|
Discr : Entity_Id;
|
|
|
|
begin
|
|
-- Inspect the discriminants of the concurrent type and generate a
|
|
-- renaming for each one.
|
|
|
|
if Has_Discriminants (Conc_Typ) then
|
|
Discr := First_Discriminant (Conc_Typ);
|
|
while Present (Discr) loop
|
|
Prepend_To (Decls,
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Chars (Discr)),
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Etype (Discr), Loc),
|
|
Name =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Occurrence_Of (Obj_Id, Loc),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Chars (Discr)))));
|
|
|
|
Next_Discriminant (Discr);
|
|
end loop;
|
|
end if;
|
|
end Add_Discriminant_Renamings;
|
|
|
|
--------------------------
|
|
-- Add_Matching_Formals --
|
|
--------------------------
|
|
|
|
procedure Add_Matching_Formals
|
|
(Formals : List_Id;
|
|
Actuals : in out List_Id)
|
|
is
|
|
Formal : Entity_Id;
|
|
New_Formal : Entity_Id;
|
|
|
|
begin
|
|
-- Inspect the formal parameters of the entry and generate a new
|
|
-- matching formal with the same name for the wrapper. A reference
|
|
-- to the new formal becomes an actual in the entry call.
|
|
|
|
Formal := First_Formal (E);
|
|
while Present (Formal) loop
|
|
New_Formal := Make_Defining_Identifier (Loc, Chars (Formal));
|
|
Append_To (Formals,
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier => New_Formal,
|
|
In_Present => In_Present (Parent (Formal)),
|
|
Out_Present => Out_Present (Parent (Formal)),
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (Etype (Formal), Loc)));
|
|
|
|
if No (Actuals) then
|
|
Actuals := New_List;
|
|
end if;
|
|
|
|
Append_To (Actuals, New_Occurrence_Of (New_Formal, Loc));
|
|
Next_Formal (Formal);
|
|
end loop;
|
|
end Add_Matching_Formals;
|
|
|
|
---------------------
|
|
-- Transfer_Pragma --
|
|
---------------------
|
|
|
|
procedure Transfer_Pragma (Prag : Node_Id; To : in out List_Id) is
|
|
New_Prag : Node_Id;
|
|
|
|
begin
|
|
if No (To) then
|
|
To := New_List;
|
|
end if;
|
|
|
|
New_Prag := Relocate_Node (Prag);
|
|
|
|
Set_Analyzed (New_Prag, False);
|
|
Append (New_Prag, To);
|
|
end Transfer_Pragma;
|
|
|
|
-- Local variables
|
|
|
|
Items : constant Node_Id := Contract (E);
|
|
Actuals : List_Id := No_List;
|
|
Call : Node_Id;
|
|
Call_Nam : Node_Id;
|
|
Decls : List_Id := No_List;
|
|
Formals : List_Id;
|
|
Has_Pragma : Boolean := False;
|
|
Index_Id : Entity_Id;
|
|
Obj_Id : Entity_Id;
|
|
Prag : Node_Id;
|
|
Wrapper_Id : Entity_Id;
|
|
|
|
-- Start of processing for Build_Contract_Wrapper
|
|
|
|
begin
|
|
-- This routine generates a specialized wrapper for a protected or task
|
|
-- entry [family] which implements precondition/postcondition semantics.
|
|
-- Preconditions and case guards of contract cases are checked before
|
|
-- the protected action or rendezvous takes place. Postconditions and
|
|
-- consequences of contract cases are checked after the protected action
|
|
-- or rendezvous takes place. The structure of the generated wrapper is
|
|
-- as follows:
|
|
|
|
-- procedure Wrapper
|
|
-- (Obj_Id : Conc_Typ; -- concurrent object
|
|
-- [Index : Index_Typ;] -- index of entry family
|
|
-- [Formal_1 : ...; -- parameters of original entry
|
|
-- Formal_N : ...])
|
|
-- is
|
|
-- [Discr_1 : ... renames Obj_Id.Discr_1; -- discriminant
|
|
-- Discr_N : ... renames Obj_Id.Discr_N;] -- renamings
|
|
|
|
-- <precondition checks>
|
|
-- <case guard checks>
|
|
|
|
-- procedure _Postconditions is
|
|
-- begin
|
|
-- <postcondition checks>
|
|
-- <consequence checks>
|
|
-- end _Postconditions;
|
|
|
|
-- begin
|
|
-- Entry_Call (Obj_Id, [Index,] [Formal_1, Formal_N]);
|
|
-- _Postconditions;
|
|
-- end Wrapper;
|
|
|
|
-- Create the wrapper only when the entry has at least one executable
|
|
-- contract item such as contract cases, precondition or postcondition.
|
|
|
|
if Present (Items) then
|
|
|
|
-- Inspect the list of pre/postconditions and transfer all available
|
|
-- pragmas to the declarative list of the wrapper.
|
|
|
|
Prag := Pre_Post_Conditions (Items);
|
|
while Present (Prag) loop
|
|
if Nam_In (Pragma_Name (Prag), Name_Postcondition,
|
|
Name_Precondition)
|
|
and then Is_Checked (Prag)
|
|
then
|
|
Has_Pragma := True;
|
|
Transfer_Pragma (Prag, To => Decls);
|
|
end if;
|
|
|
|
Prag := Next_Pragma (Prag);
|
|
end loop;
|
|
|
|
-- Inspect the list of test/contract cases and transfer only contract
|
|
-- cases pragmas to the declarative part of the wrapper.
|
|
|
|
Prag := Contract_Test_Cases (Items);
|
|
while Present (Prag) loop
|
|
if Pragma_Name (Prag) = Name_Contract_Cases
|
|
and then Is_Checked (Prag)
|
|
then
|
|
Has_Pragma := True;
|
|
Transfer_Pragma (Prag, To => Decls);
|
|
end if;
|
|
|
|
Prag := Next_Pragma (Prag);
|
|
end loop;
|
|
end if;
|
|
|
|
-- The entry lacks executable contract items and a wrapper is not needed
|
|
|
|
if not Has_Pragma then
|
|
return;
|
|
end if;
|
|
|
|
-- Create the profile of the wrapper. The first formal parameter is the
|
|
-- concurrent object.
|
|
|
|
Obj_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => New_External_Name (Chars (Conc_Typ), 'A'));
|
|
|
|
Formals := New_List (
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier => Obj_Id,
|
|
Out_Present => True,
|
|
In_Present => True,
|
|
Parameter_Type => New_Occurrence_Of (Conc_Typ, Loc)));
|
|
|
|
-- Construct the call to the original entry. The call will be gradually
|
|
-- augmented with an optional entry index and extra parameters.
|
|
|
|
Call_Nam :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Occurrence_Of (Obj_Id, Loc),
|
|
Selector_Name => New_Occurrence_Of (E, Loc));
|
|
|
|
-- When creating a wrapper for an entry family, the second formal is the
|
|
-- entry index.
|
|
|
|
if Ekind (E) = E_Entry_Family then
|
|
Index_Id := Make_Defining_Identifier (Loc, Name_I);
|
|
|
|
Append_To (Formals,
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier => Index_Id,
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (Entry_Index_Type (E), Loc)));
|
|
|
|
-- The call to the original entry becomes an indexed component to
|
|
-- accommodate the entry index.
|
|
|
|
Call_Nam :=
|
|
Make_Indexed_Component (Loc,
|
|
Prefix => Call_Nam,
|
|
Expressions => New_List (New_Occurrence_Of (Index_Id, Loc)));
|
|
end if;
|
|
|
|
-- Add formal parameters to match those of the entry and build actuals
|
|
-- for the entry call.
|
|
|
|
Add_Matching_Formals (Formals, Actuals);
|
|
|
|
Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Call_Nam,
|
|
Parameter_Associations => Actuals);
|
|
|
|
-- Add renaming declarations for the discriminants of the enclosing type
|
|
-- as the various contract items may reference them.
|
|
|
|
Add_Discriminant_Renamings (Obj_Id, Decls);
|
|
|
|
Wrapper_Id :=
|
|
Make_Defining_Identifier (Loc, New_External_Name (Chars (E), 'E'));
|
|
Set_Contract_Wrapper (E, Wrapper_Id);
|
|
|
|
-- The wrapper body is analyzed when the enclosing type is frozen
|
|
|
|
Append_Freeze_Action (Defining_Entity (Decl),
|
|
Make_Subprogram_Body (Loc,
|
|
Specification =>
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name => Wrapper_Id,
|
|
Parameter_Specifications => Formals),
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Call))));
|
|
end Build_Contract_Wrapper;
|
|
|
|
--------------------------------
|
|
-- Build_Corresponding_Record --
|
|
--------------------------------
|
|
|
|
function Build_Corresponding_Record
|
|
(N : Node_Id;
|
|
Ctyp : Entity_Id;
|
|
Loc : Source_Ptr) return Node_Id
|
|
is
|
|
Rec_Ent : constant Entity_Id :=
|
|
Make_Defining_Identifier
|
|
(Loc, New_External_Name (Chars (Ctyp), 'V'));
|
|
Disc : Entity_Id;
|
|
Dlist : List_Id;
|
|
New_Disc : Entity_Id;
|
|
Cdecls : List_Id;
|
|
|
|
begin
|
|
Set_Corresponding_Record_Type (Ctyp, Rec_Ent);
|
|
Set_Ekind (Rec_Ent, E_Record_Type);
|
|
Set_Has_Delayed_Freeze (Rec_Ent, Has_Delayed_Freeze (Ctyp));
|
|
Set_Is_Concurrent_Record_Type (Rec_Ent, True);
|
|
Set_Corresponding_Concurrent_Type (Rec_Ent, Ctyp);
|
|
Set_Stored_Constraint (Rec_Ent, No_Elist);
|
|
Cdecls := New_List;
|
|
|
|
-- Use discriminals to create list of discriminants for record, and
|
|
-- create new discriminals for use in default expressions, etc. It is
|
|
-- worth noting that a task discriminant gives rise to 5 entities;
|
|
|
|
-- a) The original discriminant.
|
|
-- b) The discriminal for use in the task.
|
|
-- c) The discriminant of the corresponding record.
|
|
-- d) The discriminal for the init proc of the corresponding record.
|
|
-- e) The local variable that renames the discriminant in the procedure
|
|
-- for the task body.
|
|
|
|
-- In fact the discriminals b) are used in the renaming declarations
|
|
-- for e). See details in einfo (Handling of Discriminants).
|
|
|
|
if Present (Discriminant_Specifications (N)) then
|
|
Dlist := New_List;
|
|
Disc := First_Discriminant (Ctyp);
|
|
|
|
while Present (Disc) loop
|
|
New_Disc := CR_Discriminant (Disc);
|
|
|
|
Append_To (Dlist,
|
|
Make_Discriminant_Specification (Loc,
|
|
Defining_Identifier => New_Disc,
|
|
Discriminant_Type =>
|
|
New_Occurrence_Of (Etype (Disc), Loc),
|
|
Expression =>
|
|
New_Copy (Discriminant_Default_Value (Disc))));
|
|
|
|
Next_Discriminant (Disc);
|
|
end loop;
|
|
|
|
else
|
|
Dlist := No_List;
|
|
end if;
|
|
|
|
-- Now we can construct the record type declaration. Note that this
|
|
-- record is "limited tagged". It is "limited" to reflect the underlying
|
|
-- limitedness of the task or protected object that it represents, and
|
|
-- ensuring for example that it is properly passed by reference. It is
|
|
-- "tagged" to give support to dispatching calls through interfaces. We
|
|
-- propagate here the list of interfaces covered by the concurrent type
|
|
-- (Ada 2005: AI-345).
|
|
|
|
return
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Rec_Ent,
|
|
Discriminant_Specifications => Dlist,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Component_List =>
|
|
Make_Component_List (Loc, Component_Items => Cdecls),
|
|
Tagged_Present =>
|
|
Ada_Version >= Ada_2005 and then Is_Tagged_Type (Ctyp),
|
|
Interface_List => Interface_List (N),
|
|
Limited_Present => True));
|
|
end Build_Corresponding_Record;
|
|
|
|
---------------------------------
|
|
-- Build_Dispatching_Tag_Check --
|
|
---------------------------------
|
|
|
|
function Build_Dispatching_Tag_Check
|
|
(K : Entity_Id;
|
|
N : Node_Id) return Node_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
begin
|
|
return
|
|
Make_Op_Or (Loc,
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (K, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_TK_Limited_Tagged), Loc)),
|
|
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (K, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_TK_Tagged), Loc)));
|
|
end Build_Dispatching_Tag_Check;
|
|
|
|
----------------------------------
|
|
-- Build_Entry_Count_Expression --
|
|
----------------------------------
|
|
|
|
function Build_Entry_Count_Expression
|
|
(Concurrent_Type : Node_Id;
|
|
Component_List : List_Id;
|
|
Loc : Source_Ptr) return Node_Id
|
|
is
|
|
Eindx : Nat;
|
|
Ent : Entity_Id;
|
|
Ecount : Node_Id;
|
|
Comp : Node_Id;
|
|
Lo : Node_Id;
|
|
Hi : Node_Id;
|
|
Typ : Entity_Id;
|
|
Large : Boolean;
|
|
|
|
begin
|
|
-- Count number of non-family entries
|
|
|
|
Eindx := 0;
|
|
Ent := First_Entity (Concurrent_Type);
|
|
while Present (Ent) loop
|
|
if Ekind (Ent) = E_Entry then
|
|
Eindx := Eindx + 1;
|
|
end if;
|
|
|
|
Next_Entity (Ent);
|
|
end loop;
|
|
|
|
Ecount := Make_Integer_Literal (Loc, Eindx);
|
|
|
|
-- Loop through entry families building the addition nodes
|
|
|
|
Ent := First_Entity (Concurrent_Type);
|
|
Comp := First (Component_List);
|
|
while Present (Ent) loop
|
|
if Ekind (Ent) = E_Entry_Family then
|
|
while Chars (Ent) /= Chars (Defining_Identifier (Comp)) loop
|
|
Next (Comp);
|
|
end loop;
|
|
|
|
Typ := Etype (Discrete_Subtype_Definition (Parent (Ent)));
|
|
Hi := Type_High_Bound (Typ);
|
|
Lo := Type_Low_Bound (Typ);
|
|
Large := Is_Potentially_Large_Family
|
|
(Base_Type (Typ), Concurrent_Type, Lo, Hi);
|
|
Ecount :=
|
|
Make_Op_Add (Loc,
|
|
Left_Opnd => Ecount,
|
|
Right_Opnd =>
|
|
Family_Size (Loc, Hi, Lo, Concurrent_Type, Large));
|
|
end if;
|
|
|
|
Next_Entity (Ent);
|
|
end loop;
|
|
|
|
return Ecount;
|
|
end Build_Entry_Count_Expression;
|
|
|
|
-----------------------
|
|
-- Build_Entry_Names --
|
|
-----------------------
|
|
|
|
procedure Build_Entry_Names
|
|
(Obj_Ref : Node_Id;
|
|
Obj_Typ : Entity_Id;
|
|
Stmts : List_Id)
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (Obj_Ref);
|
|
Data : Entity_Id := Empty;
|
|
Index : Entity_Id := Empty;
|
|
Typ : Entity_Id := Obj_Typ;
|
|
|
|
procedure Build_Entry_Name (Comp_Id : Entity_Id);
|
|
-- Given an entry [family], create a static string which denotes the
|
|
-- name of Comp_Id and assign it to the underlying data structure which
|
|
-- contains the entry names of a concurrent object.
|
|
|
|
function Object_Reference return Node_Id;
|
|
-- Return a reference to field _object or _task_id depending on the
|
|
-- concurrent object being processed.
|
|
|
|
----------------------
|
|
-- Build_Entry_Name --
|
|
----------------------
|
|
|
|
procedure Build_Entry_Name (Comp_Id : Entity_Id) is
|
|
function Build_Range (Def : Node_Id) return Node_Id;
|
|
-- Given a discrete subtype definition of an entry family, generate a
|
|
-- range node which covers the range of Def's type.
|
|
|
|
procedure Create_Index_And_Data;
|
|
-- Generate the declarations of variables Index and Data. Subsequent
|
|
-- calls do nothing.
|
|
|
|
function Increment_Index return Node_Id;
|
|
-- Increment the index used in the assignment of string names to the
|
|
-- Data array.
|
|
|
|
function Name_Declaration (Def_Id : Entity_Id) return Node_Id;
|
|
-- Given the name of a temporary variable, create the following
|
|
-- declaration for it:
|
|
--
|
|
-- Def_Id : aliased constant String := <String_Name_From_Buffer>;
|
|
|
|
function Set_Entry_Name (Def_Id : Entity_Id) return Node_Id;
|
|
-- Given the name of a temporary variable, place it in the array of
|
|
-- string names. Generate:
|
|
--
|
|
-- Data (Index) := Def_Id'Unchecked_Access;
|
|
|
|
-----------------
|
|
-- Build_Range --
|
|
-----------------
|
|
|
|
function Build_Range (Def : Node_Id) return Node_Id is
|
|
High : Node_Id := Type_High_Bound (Etype (Def));
|
|
Low : Node_Id := Type_Low_Bound (Etype (Def));
|
|
|
|
begin
|
|
-- If a bound references a discriminant, generate an identifier
|
|
-- with the same name. Resolution will map it to the formals of
|
|
-- the init proc.
|
|
|
|
if Is_Entity_Name (Low)
|
|
and then Ekind (Entity (Low)) = E_Discriminant
|
|
then
|
|
Low :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Copy_Tree (Obj_Ref),
|
|
Selector_Name => Make_Identifier (Loc, Chars (Low)));
|
|
else
|
|
Low := New_Copy_Tree (Low);
|
|
end if;
|
|
|
|
if Is_Entity_Name (High)
|
|
and then Ekind (Entity (High)) = E_Discriminant
|
|
then
|
|
High :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Copy_Tree (Obj_Ref),
|
|
Selector_Name => Make_Identifier (Loc, Chars (High)));
|
|
else
|
|
High := New_Copy_Tree (High);
|
|
end if;
|
|
|
|
return
|
|
Make_Range (Loc,
|
|
Low_Bound => Low,
|
|
High_Bound => High);
|
|
end Build_Range;
|
|
|
|
---------------------------
|
|
-- Create_Index_And_Data --
|
|
---------------------------
|
|
|
|
procedure Create_Index_And_Data is
|
|
begin
|
|
if No (Index) and then No (Data) then
|
|
declare
|
|
Count : RE_Id;
|
|
Data_Typ : RE_Id;
|
|
Size : Entity_Id;
|
|
|
|
begin
|
|
if Is_Protected_Type (Typ) then
|
|
Count := RO_PE_Number_Of_Entries;
|
|
Data_Typ := RE_Protected_Entry_Names_Array;
|
|
else
|
|
Count := RO_ST_Number_Of_Entries;
|
|
Data_Typ := RE_Task_Entry_Names_Array;
|
|
end if;
|
|
|
|
-- Step 1: Generate the declaration of the index variable:
|
|
|
|
-- Index : Entry_Index := 1;
|
|
|
|
Index := Make_Temporary (Loc, 'I');
|
|
|
|
Append_To (Stmts,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Index,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Entry_Index), Loc),
|
|
Expression => Make_Integer_Literal (Loc, 1)));
|
|
|
|
-- Step 2: Generate the declaration of an array to house all
|
|
-- names:
|
|
|
|
-- Size : constant Entry_Index := <Count> (Obj_Ref);
|
|
-- Data : aliased <Data_Typ> := (1 .. Size => null);
|
|
|
|
Size := Make_Temporary (Loc, 'S');
|
|
|
|
Append_To (Stmts,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Size,
|
|
Constant_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Entry_Index), Loc),
|
|
Expression =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (Count), Loc),
|
|
Parameter_Associations =>
|
|
New_List (Object_Reference))));
|
|
|
|
Data := Make_Temporary (Loc, 'A');
|
|
|
|
Append_To (Stmts,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Data,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (Data_Typ), Loc),
|
|
Expression =>
|
|
Make_Aggregate (Loc,
|
|
Component_Associations => New_List (
|
|
Make_Component_Association (Loc,
|
|
Choices => New_List (
|
|
Make_Range (Loc,
|
|
Low_Bound =>
|
|
Make_Integer_Literal (Loc, 1),
|
|
High_Bound =>
|
|
New_Occurrence_Of (Size, Loc))),
|
|
Expression => Make_Null (Loc))))));
|
|
end;
|
|
end if;
|
|
end Create_Index_And_Data;
|
|
|
|
---------------------
|
|
-- Increment_Index --
|
|
---------------------
|
|
|
|
function Increment_Index return Node_Id is
|
|
begin
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Index, Loc),
|
|
Expression =>
|
|
Make_Op_Add (Loc,
|
|
Left_Opnd => New_Occurrence_Of (Index, Loc),
|
|
Right_Opnd => Make_Integer_Literal (Loc, 1)));
|
|
end Increment_Index;
|
|
|
|
----------------------
|
|
-- Name_Declaration --
|
|
----------------------
|
|
|
|
function Name_Declaration (Def_Id : Entity_Id) return Node_Id is
|
|
begin
|
|
return
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Def_Id,
|
|
Aliased_Present => True,
|
|
Constant_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_String, Loc),
|
|
Expression =>
|
|
Make_String_Literal (Loc, String_From_Name_Buffer));
|
|
end Name_Declaration;
|
|
|
|
--------------------
|
|
-- Set_Entry_Name --
|
|
--------------------
|
|
|
|
function Set_Entry_Name (Def_Id : Entity_Id) return Node_Id is
|
|
begin
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Indexed_Component (Loc,
|
|
Prefix => New_Occurrence_Of (Data, Loc),
|
|
Expressions => New_List (New_Occurrence_Of (Index, Loc))),
|
|
|
|
Expression =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Def_Id, Loc),
|
|
Attribute_Name => Name_Unchecked_Access));
|
|
end Set_Entry_Name;
|
|
|
|
-- Local variables
|
|
|
|
Temp_Id : Entity_Id;
|
|
Subt_Def : Node_Id;
|
|
|
|
-- Start of processing for Build_Entry_Name
|
|
|
|
begin
|
|
if Ekind (Comp_Id) = E_Entry_Family then
|
|
Subt_Def := Discrete_Subtype_Definition (Parent (Comp_Id));
|
|
|
|
Create_Index_And_Data;
|
|
|
|
-- Step 1: Create the string name of the entry family.
|
|
-- Generate:
|
|
-- Temp : aliased constant String := "name ()";
|
|
|
|
Temp_Id := Make_Temporary (Loc, 'S');
|
|
Get_Name_String (Chars (Comp_Id));
|
|
Add_Char_To_Name_Buffer (' ');
|
|
Add_Char_To_Name_Buffer ('(');
|
|
Add_Char_To_Name_Buffer (')');
|
|
|
|
Append_To (Stmts, Name_Declaration (Temp_Id));
|
|
|
|
-- Generate:
|
|
-- for Member in Family_Low .. Family_High loop
|
|
-- Set_Entry_Name (...);
|
|
-- Index := Index + 1;
|
|
-- end loop;
|
|
|
|
Append_To (Stmts,
|
|
Make_Loop_Statement (Loc,
|
|
Iteration_Scheme =>
|
|
Make_Iteration_Scheme (Loc,
|
|
Loop_Parameter_Specification =>
|
|
Make_Loop_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Temporary (Loc, 'L'),
|
|
Discrete_Subtype_Definition =>
|
|
Build_Range (Subt_Def))),
|
|
|
|
Statements => New_List (
|
|
Set_Entry_Name (Temp_Id),
|
|
Increment_Index),
|
|
End_Label => Empty));
|
|
|
|
-- Entry
|
|
|
|
else
|
|
Create_Index_And_Data;
|
|
|
|
-- Step 1: Create the string name of the entry. Generate:
|
|
-- Temp : aliased constant String := "name";
|
|
|
|
Temp_Id := Make_Temporary (Loc, 'S');
|
|
Get_Name_String (Chars (Comp_Id));
|
|
|
|
Append_To (Stmts, Name_Declaration (Temp_Id));
|
|
|
|
-- Step 2: Associate the string name with the underlying data
|
|
-- structure.
|
|
|
|
Append_To (Stmts, Set_Entry_Name (Temp_Id));
|
|
Append_To (Stmts, Increment_Index);
|
|
end if;
|
|
end Build_Entry_Name;
|
|
|
|
----------------------
|
|
-- Object_Reference --
|
|
----------------------
|
|
|
|
function Object_Reference return Node_Id is
|
|
Conc_Typ : constant Entity_Id := Corresponding_Record_Type (Typ);
|
|
Field : Name_Id;
|
|
Ref : Node_Id;
|
|
|
|
begin
|
|
if Is_Protected_Type (Typ) then
|
|
Field := Name_uObject;
|
|
else
|
|
Field := Name_uTask_Id;
|
|
end if;
|
|
|
|
Ref :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (Conc_Typ, New_Copy_Tree (Obj_Ref)),
|
|
Selector_Name => Make_Identifier (Loc, Field));
|
|
|
|
if Is_Protected_Type (Typ) then
|
|
Ref :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Ref,
|
|
Attribute_Name => Name_Unchecked_Access);
|
|
end if;
|
|
|
|
return Ref;
|
|
end Object_Reference;
|
|
|
|
-- Local variables
|
|
|
|
Comp : Node_Id;
|
|
Proc : RE_Id;
|
|
|
|
-- Start of processing for Build_Entry_Names
|
|
|
|
begin
|
|
-- Retrieve the original concurrent type
|
|
|
|
if Is_Concurrent_Record_Type (Typ) then
|
|
Typ := Corresponding_Concurrent_Type (Typ);
|
|
end if;
|
|
|
|
pragma Assert (Is_Concurrent_Type (Typ));
|
|
|
|
-- Nothing to do if the type has no entries
|
|
|
|
if not Has_Entries (Typ) then
|
|
return;
|
|
end if;
|
|
|
|
-- Avoid generating entry names for a protected type with only one entry
|
|
|
|
if Is_Protected_Type (Typ)
|
|
and then Find_Protection_Type (Base_Type (Typ)) /=
|
|
RTE (RE_Protection_Entries)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Step 1: Populate the array with statically generated strings denoting
|
|
-- entries and entry family names.
|
|
|
|
Comp := First_Entity (Typ);
|
|
while Present (Comp) loop
|
|
if Comes_From_Source (Comp)
|
|
and then Ekind_In (Comp, E_Entry, E_Entry_Family)
|
|
then
|
|
Build_Entry_Name (Comp);
|
|
end if;
|
|
|
|
Next_Entity (Comp);
|
|
end loop;
|
|
|
|
-- Step 2: Associate the array with the related concurrent object:
|
|
|
|
-- Set_Entry_Names (Obj_Ref, <Data>'Unchecked_Access);
|
|
|
|
if Present (Data) then
|
|
if Is_Protected_Type (Typ) then
|
|
Proc := RO_PE_Set_Entry_Names;
|
|
else
|
|
Proc := RO_ST_Set_Entry_Names;
|
|
end if;
|
|
|
|
Append_To (Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (Proc), Loc),
|
|
Parameter_Associations => New_List (
|
|
Object_Reference,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Data, Loc),
|
|
Attribute_Name => Name_Unchecked_Access))));
|
|
end if;
|
|
end Build_Entry_Names;
|
|
|
|
---------------------------
|
|
-- Build_Parameter_Block --
|
|
---------------------------
|
|
|
|
function Build_Parameter_Block
|
|
(Loc : Source_Ptr;
|
|
Actuals : List_Id;
|
|
Formals : List_Id;
|
|
Decls : List_Id) return Entity_Id
|
|
is
|
|
Actual : Entity_Id;
|
|
Comp_Nam : Node_Id;
|
|
Comps : List_Id;
|
|
Formal : Entity_Id;
|
|
Has_Comp : Boolean := False;
|
|
Rec_Nam : Node_Id;
|
|
|
|
begin
|
|
Actual := First (Actuals);
|
|
Comps := New_List;
|
|
Formal := Defining_Identifier (First (Formals));
|
|
|
|
while Present (Actual) loop
|
|
if not Is_Controlling_Actual (Actual) then
|
|
|
|
-- Generate:
|
|
-- type Ann is access all <actual-type>
|
|
|
|
Comp_Nam := Make_Temporary (Loc, 'A');
|
|
Set_Is_Param_Block_Component_Type (Comp_Nam);
|
|
|
|
Append_To (Decls,
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Comp_Nam,
|
|
Type_Definition =>
|
|
Make_Access_To_Object_Definition (Loc,
|
|
All_Present => True,
|
|
Constant_Present => Ekind (Formal) = E_In_Parameter,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (Etype (Actual), Loc))));
|
|
|
|
-- Generate:
|
|
-- Param : Ann;
|
|
|
|
Append_To (Comps,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Chars (Formal)),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present =>
|
|
False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (Comp_Nam, Loc))));
|
|
|
|
Has_Comp := True;
|
|
end if;
|
|
|
|
Next_Actual (Actual);
|
|
Next_Formal_With_Extras (Formal);
|
|
end loop;
|
|
|
|
Rec_Nam := Make_Temporary (Loc, 'P');
|
|
|
|
if Has_Comp then
|
|
|
|
-- Generate:
|
|
-- type Pnn is record
|
|
-- Param1 : Ann1;
|
|
-- ...
|
|
-- ParamN : AnnN;
|
|
|
|
-- where Pnn is a parameter wrapping record, Param1 .. ParamN are
|
|
-- the original parameter names and Ann1 .. AnnN are the access to
|
|
-- actual types.
|
|
|
|
Append_To (Decls,
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Rec_Nam,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Component_List =>
|
|
Make_Component_List (Loc, Comps))));
|
|
else
|
|
-- Generate:
|
|
-- type Pnn is null record;
|
|
|
|
Append_To (Decls,
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Rec_Nam,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Null_Present => True,
|
|
Component_List => Empty)));
|
|
end if;
|
|
|
|
return Rec_Nam;
|
|
end Build_Parameter_Block;
|
|
|
|
--------------------------------------
|
|
-- Build_Renamed_Formal_Declaration --
|
|
--------------------------------------
|
|
|
|
function Build_Renamed_Formal_Declaration
|
|
(New_F : Entity_Id;
|
|
Formal : Entity_Id;
|
|
Comp : Entity_Id;
|
|
Renamed_Formal : Node_Id) return Node_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (New_F);
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
-- If the formal is a tagged incomplete type, it is already passed
|
|
-- by reference, so it is sufficient to rename the pointer component
|
|
-- that corresponds to the actual. Otherwise we need to dereference
|
|
-- the pointer component to obtain the actual.
|
|
|
|
if Is_Incomplete_Type (Etype (Formal))
|
|
and then Is_Tagged_Type (Etype (Formal))
|
|
then
|
|
Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => New_F,
|
|
Subtype_Mark => New_Occurrence_Of (Etype (Comp), Loc),
|
|
Name => Renamed_Formal);
|
|
|
|
else
|
|
Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => New_F,
|
|
Subtype_Mark => New_Occurrence_Of (Etype (Formal), Loc),
|
|
Name =>
|
|
Make_Explicit_Dereference (Loc, Renamed_Formal));
|
|
end if;
|
|
|
|
return Decl;
|
|
end Build_Renamed_Formal_Declaration;
|
|
|
|
--------------------------
|
|
-- Build_Wrapper_Bodies --
|
|
--------------------------
|
|
|
|
procedure Build_Wrapper_Bodies
|
|
(Loc : Source_Ptr;
|
|
Typ : Entity_Id;
|
|
N : Node_Id)
|
|
is
|
|
Rec_Typ : Entity_Id;
|
|
|
|
function Build_Wrapper_Body
|
|
(Loc : Source_Ptr;
|
|
Subp_Id : Entity_Id;
|
|
Obj_Typ : Entity_Id;
|
|
Formals : List_Id) return Node_Id;
|
|
-- Ada 2005 (AI-345): Build the body that wraps a primitive operation
|
|
-- associated with a protected or task type. Subp_Id is the subprogram
|
|
-- name which will be wrapped. Obj_Typ is the type of the new formal
|
|
-- parameter which handles dispatching and object notation. Formals are
|
|
-- the original formals of Subp_Id which will be explicitly replicated.
|
|
|
|
------------------------
|
|
-- Build_Wrapper_Body --
|
|
------------------------
|
|
|
|
function Build_Wrapper_Body
|
|
(Loc : Source_Ptr;
|
|
Subp_Id : Entity_Id;
|
|
Obj_Typ : Entity_Id;
|
|
Formals : List_Id) return Node_Id
|
|
is
|
|
Body_Spec : Node_Id;
|
|
|
|
begin
|
|
Body_Spec := Build_Wrapper_Spec (Subp_Id, Obj_Typ, Formals);
|
|
|
|
-- The subprogram is not overriding or is not a primitive declared
|
|
-- between two views.
|
|
|
|
if No (Body_Spec) then
|
|
return Empty;
|
|
end if;
|
|
|
|
declare
|
|
Actuals : List_Id := No_List;
|
|
Conv_Id : Node_Id;
|
|
First_Form : Node_Id;
|
|
Formal : Node_Id;
|
|
Nam : Node_Id;
|
|
|
|
begin
|
|
-- Map formals to actuals. Use the list built for the wrapper
|
|
-- spec, skipping the object notation parameter.
|
|
|
|
First_Form := First (Parameter_Specifications (Body_Spec));
|
|
|
|
Formal := First_Form;
|
|
Next (Formal);
|
|
|
|
if Present (Formal) then
|
|
Actuals := New_List;
|
|
while Present (Formal) loop
|
|
Append_To (Actuals,
|
|
Make_Identifier (Loc,
|
|
Chars => Chars (Defining_Identifier (Formal))));
|
|
Next (Formal);
|
|
end loop;
|
|
end if;
|
|
|
|
-- Special processing for primitives declared between a private
|
|
-- type and its completion: the wrapper needs a properly typed
|
|
-- parameter if the wrapped operation has a controlling first
|
|
-- parameter. Note that this might not be the case for a function
|
|
-- with a controlling result.
|
|
|
|
if Is_Private_Primitive_Subprogram (Subp_Id) then
|
|
if No (Actuals) then
|
|
Actuals := New_List;
|
|
end if;
|
|
|
|
if Is_Controlling_Formal (First_Formal (Subp_Id)) then
|
|
Prepend_To (Actuals,
|
|
Unchecked_Convert_To
|
|
(Corresponding_Concurrent_Type (Obj_Typ),
|
|
Make_Identifier (Loc, Name_uO)));
|
|
|
|
else
|
|
Prepend_To (Actuals,
|
|
Make_Identifier (Loc,
|
|
Chars => Chars (Defining_Identifier (First_Form))));
|
|
end if;
|
|
|
|
Nam := New_Occurrence_Of (Subp_Id, Loc);
|
|
else
|
|
-- An access-to-variable object parameter requires an explicit
|
|
-- dereference in the unchecked conversion. This case occurs
|
|
-- when a protected entry wrapper must override an interface
|
|
-- level procedure with interface access as first parameter.
|
|
|
|
-- O.all.Subp_Id (Formal_1, ..., Formal_N)
|
|
|
|
if Nkind (Parameter_Type (First_Form)) =
|
|
N_Access_Definition
|
|
then
|
|
Conv_Id :=
|
|
Make_Explicit_Dereference (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uO));
|
|
else
|
|
Conv_Id := Make_Identifier (Loc, Name_uO);
|
|
end if;
|
|
|
|
Nam :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To
|
|
(Corresponding_Concurrent_Type (Obj_Typ), Conv_Id),
|
|
Selector_Name => New_Occurrence_Of (Subp_Id, Loc));
|
|
end if;
|
|
|
|
-- Create the subprogram body. For a function, the call to the
|
|
-- actual subprogram has to be converted to the corresponding
|
|
-- record if it is a controlling result.
|
|
|
|
if Ekind (Subp_Id) = E_Function then
|
|
declare
|
|
Res : Node_Id;
|
|
|
|
begin
|
|
Res :=
|
|
Make_Function_Call (Loc,
|
|
Name => Nam,
|
|
Parameter_Associations => Actuals);
|
|
|
|
if Has_Controlling_Result (Subp_Id) then
|
|
Res :=
|
|
Unchecked_Convert_To
|
|
(Corresponding_Record_Type (Etype (Subp_Id)), Res);
|
|
end if;
|
|
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Specification => Body_Spec,
|
|
Declarations => Empty_List,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (
|
|
Make_Simple_Return_Statement (Loc, Res))));
|
|
end;
|
|
|
|
else
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Specification => Body_Spec,
|
|
Declarations => Empty_List,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Nam,
|
|
Parameter_Associations => Actuals))));
|
|
end if;
|
|
end;
|
|
end Build_Wrapper_Body;
|
|
|
|
-- Start of processing for Build_Wrapper_Bodies
|
|
|
|
begin
|
|
if Is_Concurrent_Type (Typ) then
|
|
Rec_Typ := Corresponding_Record_Type (Typ);
|
|
else
|
|
Rec_Typ := Typ;
|
|
end if;
|
|
|
|
-- Generate wrapper bodies for a concurrent type which implements an
|
|
-- interface.
|
|
|
|
if Present (Interfaces (Rec_Typ)) then
|
|
declare
|
|
Insert_Nod : Node_Id;
|
|
Prim : Entity_Id;
|
|
Prim_Elmt : Elmt_Id;
|
|
Prim_Decl : Node_Id;
|
|
Subp : Entity_Id;
|
|
Wrap_Body : Node_Id;
|
|
Wrap_Id : Entity_Id;
|
|
|
|
begin
|
|
Insert_Nod := N;
|
|
|
|
-- Examine all primitive operations of the corresponding record
|
|
-- type, looking for wrapper specs. Generate bodies in order to
|
|
-- complete them.
|
|
|
|
Prim_Elmt := First_Elmt (Primitive_Operations (Rec_Typ));
|
|
while Present (Prim_Elmt) loop
|
|
Prim := Node (Prim_Elmt);
|
|
|
|
if (Ekind (Prim) = E_Function
|
|
or else Ekind (Prim) = E_Procedure)
|
|
and then Is_Primitive_Wrapper (Prim)
|
|
then
|
|
Subp := Wrapped_Entity (Prim);
|
|
Prim_Decl := Parent (Parent (Prim));
|
|
|
|
Wrap_Body :=
|
|
Build_Wrapper_Body (Loc,
|
|
Subp_Id => Subp,
|
|
Obj_Typ => Rec_Typ,
|
|
Formals => Parameter_Specifications (Parent (Subp)));
|
|
Wrap_Id := Defining_Unit_Name (Specification (Wrap_Body));
|
|
|
|
Set_Corresponding_Spec (Wrap_Body, Prim);
|
|
Set_Corresponding_Body (Prim_Decl, Wrap_Id);
|
|
|
|
Insert_After (Insert_Nod, Wrap_Body);
|
|
Insert_Nod := Wrap_Body;
|
|
|
|
Analyze (Wrap_Body);
|
|
end if;
|
|
|
|
Next_Elmt (Prim_Elmt);
|
|
end loop;
|
|
end;
|
|
end if;
|
|
end Build_Wrapper_Bodies;
|
|
|
|
------------------------
|
|
-- Build_Wrapper_Spec --
|
|
------------------------
|
|
|
|
function Build_Wrapper_Spec
|
|
(Subp_Id : Entity_Id;
|
|
Obj_Typ : Entity_Id;
|
|
Formals : List_Id) return Node_Id
|
|
is
|
|
function Overriding_Possible
|
|
(Iface_Op : Entity_Id;
|
|
Wrapper : Entity_Id) return Boolean;
|
|
-- Determine whether a primitive operation can be overridden by Wrapper.
|
|
-- Iface_Op is the candidate primitive operation of an interface type,
|
|
-- Wrapper is the generated entry wrapper.
|
|
|
|
function Replicate_Formals
|
|
(Loc : Source_Ptr;
|
|
Formals : List_Id) return List_Id;
|
|
-- An explicit parameter replication is required due to the Is_Entry_
|
|
-- Formal flag being set for all the formals of an entry. The explicit
|
|
-- replication removes the flag that would otherwise cause a different
|
|
-- path of analysis.
|
|
|
|
-------------------------
|
|
-- Overriding_Possible --
|
|
-------------------------
|
|
|
|
function Overriding_Possible
|
|
(Iface_Op : Entity_Id;
|
|
Wrapper : Entity_Id) return Boolean
|
|
is
|
|
Iface_Op_Spec : constant Node_Id := Parent (Iface_Op);
|
|
Wrapper_Spec : constant Node_Id := Parent (Wrapper);
|
|
|
|
function Type_Conformant_Parameters
|
|
(Iface_Op_Params : List_Id;
|
|
Wrapper_Params : List_Id) return Boolean;
|
|
-- Determine whether the parameters of the generated entry wrapper
|
|
-- and those of a primitive operation are type conformant. During
|
|
-- this check, the first parameter of the primitive operation is
|
|
-- skipped if it is a controlling argument: protected functions
|
|
-- may have a controlling result.
|
|
|
|
--------------------------------
|
|
-- Type_Conformant_Parameters --
|
|
--------------------------------
|
|
|
|
function Type_Conformant_Parameters
|
|
(Iface_Op_Params : List_Id;
|
|
Wrapper_Params : List_Id) return Boolean
|
|
is
|
|
Iface_Op_Param : Node_Id;
|
|
Iface_Op_Typ : Entity_Id;
|
|
Wrapper_Param : Node_Id;
|
|
Wrapper_Typ : Entity_Id;
|
|
|
|
begin
|
|
-- Skip the first (controlling) parameter of primitive operation
|
|
|
|
Iface_Op_Param := First (Iface_Op_Params);
|
|
|
|
if Present (First_Formal (Iface_Op))
|
|
and then Is_Controlling_Formal (First_Formal (Iface_Op))
|
|
then
|
|
Iface_Op_Param := Next (Iface_Op_Param);
|
|
end if;
|
|
|
|
Wrapper_Param := First (Wrapper_Params);
|
|
while Present (Iface_Op_Param)
|
|
and then Present (Wrapper_Param)
|
|
loop
|
|
Iface_Op_Typ := Find_Parameter_Type (Iface_Op_Param);
|
|
Wrapper_Typ := Find_Parameter_Type (Wrapper_Param);
|
|
|
|
-- The two parameters must be mode conformant
|
|
|
|
if not Conforming_Types
|
|
(Iface_Op_Typ, Wrapper_Typ, Mode_Conformant)
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
Next (Iface_Op_Param);
|
|
Next (Wrapper_Param);
|
|
end loop;
|
|
|
|
-- One of the lists is longer than the other
|
|
|
|
if Present (Iface_Op_Param) or else Present (Wrapper_Param) then
|
|
return False;
|
|
end if;
|
|
|
|
return True;
|
|
end Type_Conformant_Parameters;
|
|
|
|
-- Start of processing for Overriding_Possible
|
|
|
|
begin
|
|
if Chars (Iface_Op) /= Chars (Wrapper) then
|
|
return False;
|
|
end if;
|
|
|
|
-- If an inherited subprogram is implemented by a protected procedure
|
|
-- or an entry, then the first parameter of the inherited subprogram
|
|
-- must be of mode OUT or IN OUT, or access-to-variable parameter.
|
|
|
|
if Ekind (Iface_Op) = E_Procedure
|
|
and then Present (Parameter_Specifications (Iface_Op_Spec))
|
|
then
|
|
declare
|
|
Obj_Param : constant Node_Id :=
|
|
First (Parameter_Specifications (Iface_Op_Spec));
|
|
begin
|
|
if not Out_Present (Obj_Param)
|
|
and then Nkind (Parameter_Type (Obj_Param)) /=
|
|
N_Access_Definition
|
|
then
|
|
return False;
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
return
|
|
Type_Conformant_Parameters
|
|
(Parameter_Specifications (Iface_Op_Spec),
|
|
Parameter_Specifications (Wrapper_Spec));
|
|
end Overriding_Possible;
|
|
|
|
-----------------------
|
|
-- Replicate_Formals --
|
|
-----------------------
|
|
|
|
function Replicate_Formals
|
|
(Loc : Source_Ptr;
|
|
Formals : List_Id) return List_Id
|
|
is
|
|
New_Formals : constant List_Id := New_List;
|
|
Formal : Node_Id;
|
|
Param_Type : Node_Id;
|
|
|
|
begin
|
|
Formal := First (Formals);
|
|
|
|
-- Skip the object parameter when dealing with primitives declared
|
|
-- between two views.
|
|
|
|
if Is_Private_Primitive_Subprogram (Subp_Id)
|
|
and then not Has_Controlling_Result (Subp_Id)
|
|
then
|
|
Formal := Next (Formal);
|
|
end if;
|
|
|
|
while Present (Formal) loop
|
|
|
|
-- Create an explicit copy of the entry parameter
|
|
|
|
-- When creating the wrapper subprogram for a primitive operation
|
|
-- of a protected interface we must construct an equivalent
|
|
-- signature to that of the overriding operation. For regular
|
|
-- parameters we can just use the type of the formal, but for
|
|
-- access to subprogram parameters we need to reanalyze the
|
|
-- parameter type to create local entities for the signature of
|
|
-- the subprogram type. Using the entities of the overriding
|
|
-- subprogram will result in out-of-scope errors in the back-end.
|
|
|
|
if Nkind (Parameter_Type (Formal)) = N_Access_Definition then
|
|
Param_Type := Copy_Separate_Tree (Parameter_Type (Formal));
|
|
else
|
|
Param_Type :=
|
|
New_Occurrence_Of (Etype (Parameter_Type (Formal)), Loc);
|
|
end if;
|
|
|
|
Append_To (New_Formals,
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => Chars (Defining_Identifier (Formal))),
|
|
In_Present => In_Present (Formal),
|
|
Out_Present => Out_Present (Formal),
|
|
Null_Exclusion_Present => Null_Exclusion_Present (Formal),
|
|
Parameter_Type => Param_Type));
|
|
|
|
Next (Formal);
|
|
end loop;
|
|
|
|
return New_Formals;
|
|
end Replicate_Formals;
|
|
|
|
-- Local variables
|
|
|
|
Loc : constant Source_Ptr := Sloc (Subp_Id);
|
|
First_Param : Node_Id := Empty;
|
|
Iface : Entity_Id;
|
|
Iface_Elmt : Elmt_Id;
|
|
Iface_Op : Entity_Id;
|
|
Iface_Op_Elmt : Elmt_Id;
|
|
Overridden_Subp : Entity_Id;
|
|
|
|
-- Start of processing for Build_Wrapper_Spec
|
|
|
|
begin
|
|
-- No point in building wrappers for untagged concurrent types
|
|
|
|
pragma Assert (Is_Tagged_Type (Obj_Typ));
|
|
|
|
-- Check if this subprogram has a profile that matches some interface
|
|
-- primitive.
|
|
|
|
Check_Synchronized_Overriding (Subp_Id, Overridden_Subp);
|
|
|
|
if Present (Overridden_Subp) then
|
|
First_Param :=
|
|
First (Parameter_Specifications (Parent (Overridden_Subp)));
|
|
|
|
-- An entry or a protected procedure can override a routine where the
|
|
-- controlling formal is either IN OUT, OUT or is of access-to-variable
|
|
-- type. Since the wrapper must have the exact same signature as that of
|
|
-- the overridden subprogram, we try to find the overriding candidate
|
|
-- and use its controlling formal.
|
|
|
|
-- Check every implemented interface
|
|
|
|
elsif Present (Interfaces (Obj_Typ)) then
|
|
Iface_Elmt := First_Elmt (Interfaces (Obj_Typ));
|
|
Search : while Present (Iface_Elmt) loop
|
|
Iface := Node (Iface_Elmt);
|
|
|
|
-- Check every interface primitive
|
|
|
|
if Present (Primitive_Operations (Iface)) then
|
|
Iface_Op_Elmt := First_Elmt (Primitive_Operations (Iface));
|
|
while Present (Iface_Op_Elmt) loop
|
|
Iface_Op := Node (Iface_Op_Elmt);
|
|
|
|
-- Ignore predefined primitives
|
|
|
|
if not Is_Predefined_Dispatching_Operation (Iface_Op) then
|
|
Iface_Op := Ultimate_Alias (Iface_Op);
|
|
|
|
-- The current primitive operation can be overridden by
|
|
-- the generated entry wrapper.
|
|
|
|
if Overriding_Possible (Iface_Op, Subp_Id) then
|
|
First_Param :=
|
|
First (Parameter_Specifications (Parent (Iface_Op)));
|
|
|
|
exit Search;
|
|
end if;
|
|
end if;
|
|
|
|
Next_Elmt (Iface_Op_Elmt);
|
|
end loop;
|
|
end if;
|
|
|
|
Next_Elmt (Iface_Elmt);
|
|
end loop Search;
|
|
end if;
|
|
|
|
-- Do not generate the wrapper if no interface primitive is covered by
|
|
-- the subprogram and it is not a primitive declared between two views
|
|
-- (see Process_Full_View).
|
|
|
|
if No (First_Param)
|
|
and then not Is_Private_Primitive_Subprogram (Subp_Id)
|
|
then
|
|
return Empty;
|
|
end if;
|
|
|
|
declare
|
|
Wrapper_Id : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, Chars (Subp_Id));
|
|
New_Formals : List_Id;
|
|
Obj_Param : Node_Id;
|
|
Obj_Param_Typ : Entity_Id;
|
|
|
|
begin
|
|
-- Minimum decoration is needed to catch the entity in
|
|
-- Sem_Ch6.Override_Dispatching_Operation.
|
|
|
|
if Ekind (Subp_Id) = E_Function then
|
|
Set_Ekind (Wrapper_Id, E_Function);
|
|
else
|
|
Set_Ekind (Wrapper_Id, E_Procedure);
|
|
end if;
|
|
|
|
Set_Is_Primitive_Wrapper (Wrapper_Id);
|
|
Set_Wrapped_Entity (Wrapper_Id, Subp_Id);
|
|
Set_Is_Private_Primitive (Wrapper_Id,
|
|
Is_Private_Primitive_Subprogram (Subp_Id));
|
|
|
|
-- Process the formals
|
|
|
|
New_Formals := Replicate_Formals (Loc, Formals);
|
|
|
|
-- A function with a controlling result and no first controlling
|
|
-- formal needs no additional parameter.
|
|
|
|
if Has_Controlling_Result (Subp_Id)
|
|
and then
|
|
(No (First_Formal (Subp_Id))
|
|
or else not Is_Controlling_Formal (First_Formal (Subp_Id)))
|
|
then
|
|
null;
|
|
|
|
-- Routine Subp_Id has been found to override an interface primitive.
|
|
-- If the interface operation has an access parameter, create a copy
|
|
-- of it, with the same null exclusion indicator if present.
|
|
|
|
elsif Present (First_Param) then
|
|
if Nkind (Parameter_Type (First_Param)) = N_Access_Definition then
|
|
Obj_Param_Typ :=
|
|
Make_Access_Definition (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Obj_Typ, Loc),
|
|
Null_Exclusion_Present =>
|
|
Null_Exclusion_Present (Parameter_Type (First_Param)),
|
|
Constant_Present =>
|
|
Constant_Present (Parameter_Type (First_Param)));
|
|
else
|
|
Obj_Param_Typ := New_Occurrence_Of (Obj_Typ, Loc);
|
|
end if;
|
|
|
|
Obj_Param :=
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => Name_uO),
|
|
In_Present => In_Present (First_Param),
|
|
Out_Present => Out_Present (First_Param),
|
|
Parameter_Type => Obj_Param_Typ);
|
|
|
|
Prepend_To (New_Formals, Obj_Param);
|
|
|
|
-- If we are dealing with a primitive declared between two views,
|
|
-- implemented by a synchronized operation, we need to create
|
|
-- a default parameter. The mode of the parameter must match that
|
|
-- of the primitive operation.
|
|
|
|
else
|
|
pragma Assert (Is_Private_Primitive_Subprogram (Subp_Id));
|
|
|
|
Obj_Param :=
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uO),
|
|
In_Present =>
|
|
In_Present (Parent (First_Entity (Subp_Id))),
|
|
Out_Present => Ekind (Subp_Id) /= E_Function,
|
|
Parameter_Type => New_Occurrence_Of (Obj_Typ, Loc));
|
|
|
|
Prepend_To (New_Formals, Obj_Param);
|
|
end if;
|
|
|
|
-- Build the final spec. If it is a function with a controlling
|
|
-- result, it is a primitive operation of the corresponding
|
|
-- record type, so mark the spec accordingly.
|
|
|
|
if Ekind (Subp_Id) = E_Function then
|
|
declare
|
|
Res_Def : Node_Id;
|
|
|
|
begin
|
|
if Has_Controlling_Result (Subp_Id) then
|
|
Res_Def :=
|
|
New_Occurrence_Of
|
|
(Corresponding_Record_Type (Etype (Subp_Id)), Loc);
|
|
else
|
|
Res_Def := New_Copy (Result_Definition (Parent (Subp_Id)));
|
|
end if;
|
|
|
|
return
|
|
Make_Function_Specification (Loc,
|
|
Defining_Unit_Name => Wrapper_Id,
|
|
Parameter_Specifications => New_Formals,
|
|
Result_Definition => Res_Def);
|
|
end;
|
|
else
|
|
return
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name => Wrapper_Id,
|
|
Parameter_Specifications => New_Formals);
|
|
end if;
|
|
end;
|
|
end Build_Wrapper_Spec;
|
|
|
|
-------------------------
|
|
-- Build_Wrapper_Specs --
|
|
-------------------------
|
|
|
|
procedure Build_Wrapper_Specs
|
|
(Loc : Source_Ptr;
|
|
Typ : Entity_Id;
|
|
N : in out Node_Id)
|
|
is
|
|
Def : Node_Id;
|
|
Rec_Typ : Entity_Id;
|
|
procedure Scan_Declarations (L : List_Id);
|
|
-- Common processing for visible and private declarations
|
|
-- of a protected type.
|
|
|
|
procedure Scan_Declarations (L : List_Id) is
|
|
Decl : Node_Id;
|
|
Wrap_Decl : Node_Id;
|
|
Wrap_Spec : Node_Id;
|
|
|
|
begin
|
|
if No (L) then
|
|
return;
|
|
end if;
|
|
|
|
Decl := First (L);
|
|
while Present (Decl) loop
|
|
Wrap_Spec := Empty;
|
|
|
|
if Nkind (Decl) = N_Entry_Declaration
|
|
and then Ekind (Defining_Identifier (Decl)) = E_Entry
|
|
then
|
|
Wrap_Spec :=
|
|
Build_Wrapper_Spec
|
|
(Subp_Id => Defining_Identifier (Decl),
|
|
Obj_Typ => Rec_Typ,
|
|
Formals => Parameter_Specifications (Decl));
|
|
|
|
elsif Nkind (Decl) = N_Subprogram_Declaration then
|
|
Wrap_Spec :=
|
|
Build_Wrapper_Spec
|
|
(Subp_Id => Defining_Unit_Name (Specification (Decl)),
|
|
Obj_Typ => Rec_Typ,
|
|
Formals =>
|
|
Parameter_Specifications (Specification (Decl)));
|
|
end if;
|
|
|
|
if Present (Wrap_Spec) then
|
|
Wrap_Decl :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification => Wrap_Spec);
|
|
|
|
Insert_After (N, Wrap_Decl);
|
|
N := Wrap_Decl;
|
|
|
|
Analyze (Wrap_Decl);
|
|
end if;
|
|
|
|
Next (Decl);
|
|
end loop;
|
|
end Scan_Declarations;
|
|
|
|
-- start of processing for Build_Wrapper_Specs
|
|
|
|
begin
|
|
if Is_Protected_Type (Typ) then
|
|
Def := Protected_Definition (Parent (Typ));
|
|
else pragma Assert (Is_Task_Type (Typ));
|
|
Def := Task_Definition (Parent (Typ));
|
|
end if;
|
|
|
|
Rec_Typ := Corresponding_Record_Type (Typ);
|
|
|
|
-- Generate wrapper specs for a concurrent type which implements an
|
|
-- interface. Operations in both the visible and private parts may
|
|
-- implement progenitor operations.
|
|
|
|
if Present (Interfaces (Rec_Typ)) and then Present (Def) then
|
|
Scan_Declarations (Visible_Declarations (Def));
|
|
Scan_Declarations (Private_Declarations (Def));
|
|
end if;
|
|
end Build_Wrapper_Specs;
|
|
|
|
---------------------------
|
|
-- Build_Find_Body_Index --
|
|
---------------------------
|
|
|
|
function Build_Find_Body_Index (Typ : Entity_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (Typ);
|
|
Ent : Entity_Id;
|
|
E_Typ : Entity_Id;
|
|
Has_F : Boolean := False;
|
|
Index : Nat;
|
|
If_St : Node_Id := Empty;
|
|
Lo : Node_Id;
|
|
Hi : Node_Id;
|
|
Decls : List_Id := New_List;
|
|
Ret : Node_Id;
|
|
Spec : Node_Id;
|
|
Siz : Node_Id := Empty;
|
|
|
|
procedure Add_If_Clause (Expr : Node_Id);
|
|
-- Add test for range of current entry
|
|
|
|
function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id;
|
|
-- If a bound of an entry is given by a discriminant, retrieve the
|
|
-- actual value of the discriminant from the enclosing object.
|
|
|
|
-------------------
|
|
-- Add_If_Clause --
|
|
-------------------
|
|
|
|
procedure Add_If_Clause (Expr : Node_Id) is
|
|
Cond : Node_Id;
|
|
Stats : constant List_Id :=
|
|
New_List (
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression => Make_Integer_Literal (Loc, Index + 1)));
|
|
|
|
begin
|
|
-- Index for current entry body
|
|
|
|
Index := Index + 1;
|
|
|
|
-- Compute total length of entry queues so far
|
|
|
|
if No (Siz) then
|
|
Siz := Expr;
|
|
else
|
|
Siz :=
|
|
Make_Op_Add (Loc,
|
|
Left_Opnd => Siz,
|
|
Right_Opnd => Expr);
|
|
end if;
|
|
|
|
Cond :=
|
|
Make_Op_Le (Loc,
|
|
Left_Opnd => Make_Identifier (Loc, Name_uE),
|
|
Right_Opnd => Siz);
|
|
|
|
-- Map entry queue indexes in the range of the current family
|
|
-- into the current index, that designates the entry body.
|
|
|
|
if No (If_St) then
|
|
If_St :=
|
|
Make_Implicit_If_Statement (Typ,
|
|
Condition => Cond,
|
|
Then_Statements => Stats,
|
|
Elsif_Parts => New_List);
|
|
Ret := If_St;
|
|
|
|
else
|
|
Append_To (Elsif_Parts (If_St),
|
|
Make_Elsif_Part (Loc,
|
|
Condition => Cond,
|
|
Then_Statements => Stats));
|
|
end if;
|
|
end Add_If_Clause;
|
|
|
|
------------------------------
|
|
-- Convert_Discriminant_Ref --
|
|
------------------------------
|
|
|
|
function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id is
|
|
B : Node_Id;
|
|
|
|
begin
|
|
if Is_Entity_Name (Bound)
|
|
and then Ekind (Entity (Bound)) = E_Discriminant
|
|
then
|
|
B :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (Corresponding_Record_Type (Typ),
|
|
Make_Explicit_Dereference (Loc,
|
|
Make_Identifier (Loc, Name_uObject))),
|
|
Selector_Name => Make_Identifier (Loc, Chars (Bound)));
|
|
Set_Etype (B, Etype (Entity (Bound)));
|
|
else
|
|
B := New_Copy_Tree (Bound);
|
|
end if;
|
|
|
|
return B;
|
|
end Convert_Discriminant_Ref;
|
|
|
|
-- Start of processing for Build_Find_Body_Index
|
|
|
|
begin
|
|
Spec := Build_Find_Body_Index_Spec (Typ);
|
|
|
|
Ent := First_Entity (Typ);
|
|
while Present (Ent) loop
|
|
if Ekind (Ent) = E_Entry_Family then
|
|
Has_F := True;
|
|
exit;
|
|
end if;
|
|
|
|
Next_Entity (Ent);
|
|
end loop;
|
|
|
|
if not Has_F then
|
|
|
|
-- If the protected type has no entry families, there is a one-one
|
|
-- correspondence between entry queue and entry body.
|
|
|
|
Ret :=
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression => Make_Identifier (Loc, Name_uE));
|
|
|
|
else
|
|
-- Suppose entries e1, e2, ... have size l1, l2, ... we generate
|
|
-- the following:
|
|
|
|
-- if E <= l1 then return 1;
|
|
-- elsif E <= l1 + l2 then return 2;
|
|
-- ...
|
|
|
|
Index := 0;
|
|
Siz := Empty;
|
|
Ent := First_Entity (Typ);
|
|
|
|
Add_Object_Pointer (Loc, Typ, Decls);
|
|
|
|
while Present (Ent) loop
|
|
if Ekind (Ent) = E_Entry then
|
|
Add_If_Clause (Make_Integer_Literal (Loc, 1));
|
|
|
|
elsif Ekind (Ent) = E_Entry_Family then
|
|
E_Typ := Etype (Discrete_Subtype_Definition (Parent (Ent)));
|
|
Hi := Convert_Discriminant_Ref (Type_High_Bound (E_Typ));
|
|
Lo := Convert_Discriminant_Ref (Type_Low_Bound (E_Typ));
|
|
Add_If_Clause (Family_Size (Loc, Hi, Lo, Typ, False));
|
|
end if;
|
|
|
|
Next_Entity (Ent);
|
|
end loop;
|
|
|
|
if Index = 1 then
|
|
Decls := New_List;
|
|
Ret :=
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression => Make_Integer_Literal (Loc, 1));
|
|
|
|
elsif Nkind (Ret) = N_If_Statement then
|
|
|
|
-- Ranges are in increasing order, so last one doesn't need guard
|
|
|
|
declare
|
|
Nod : constant Node_Id := Last (Elsif_Parts (Ret));
|
|
begin
|
|
Remove (Nod);
|
|
Set_Else_Statements (Ret, Then_Statements (Nod));
|
|
end;
|
|
end if;
|
|
end if;
|
|
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Specification => Spec,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Ret)));
|
|
end Build_Find_Body_Index;
|
|
|
|
--------------------------------
|
|
-- Build_Find_Body_Index_Spec --
|
|
--------------------------------
|
|
|
|
function Build_Find_Body_Index_Spec (Typ : Entity_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (Typ);
|
|
Id : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => New_External_Name (Chars (Typ), 'F'));
|
|
Parm1 : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uO);
|
|
Parm2 : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uE);
|
|
|
|
begin
|
|
return
|
|
Make_Function_Specification (Loc,
|
|
Defining_Unit_Name => Id,
|
|
Parameter_Specifications => New_List (
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier => Parm1,
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc)),
|
|
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier => Parm2,
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Protected_Entry_Index), Loc))),
|
|
|
|
Result_Definition => New_Occurrence_Of (
|
|
RTE (RE_Protected_Entry_Index), Loc));
|
|
end Build_Find_Body_Index_Spec;
|
|
|
|
-----------------------------------------------
|
|
-- Build_Lock_Free_Protected_Subprogram_Body --
|
|
-----------------------------------------------
|
|
|
|
function Build_Lock_Free_Protected_Subprogram_Body
|
|
(N : Node_Id;
|
|
Prot_Typ : Node_Id;
|
|
Unprot_Spec : Node_Id) return Node_Id
|
|
is
|
|
Actuals : constant List_Id := New_List;
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Spec : constant Node_Id := Specification (N);
|
|
Unprot_Id : constant Entity_Id := Defining_Unit_Name (Unprot_Spec);
|
|
Formal : Node_Id;
|
|
Prot_Spec : Node_Id;
|
|
Stmt : Node_Id;
|
|
|
|
begin
|
|
-- Create the protected version of the body
|
|
|
|
Prot_Spec :=
|
|
Build_Protected_Sub_Specification (N, Prot_Typ, Protected_Mode);
|
|
|
|
-- Build the actual parameters which appear in the call to the
|
|
-- unprotected version of the body.
|
|
|
|
Formal := First (Parameter_Specifications (Prot_Spec));
|
|
while Present (Formal) loop
|
|
Append_To (Actuals,
|
|
Make_Identifier (Loc, Chars (Defining_Identifier (Formal))));
|
|
|
|
Next (Formal);
|
|
end loop;
|
|
|
|
-- Function case, generate:
|
|
-- return <Unprot_Func_Call>;
|
|
|
|
if Nkind (Spec) = N_Function_Specification then
|
|
Stmt :=
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
Make_Identifier (Loc, Chars (Unprot_Id)),
|
|
Parameter_Associations => Actuals));
|
|
|
|
-- Procedure case, call the unprotected version
|
|
|
|
else
|
|
Stmt :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
Make_Identifier (Loc, Chars (Unprot_Id)),
|
|
Parameter_Associations => Actuals);
|
|
end if;
|
|
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Declarations => Empty_List,
|
|
Specification => Prot_Spec,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Stmt)));
|
|
end Build_Lock_Free_Protected_Subprogram_Body;
|
|
|
|
-------------------------------------------------
|
|
-- Build_Lock_Free_Unprotected_Subprogram_Body --
|
|
-------------------------------------------------
|
|
|
|
-- Procedures which meet the lock-free implementation requirements and
|
|
-- reference a unique scalar component Comp are expanded in the following
|
|
-- manner:
|
|
|
|
-- procedure P (...) is
|
|
-- Expected_Comp : constant Comp_Type :=
|
|
-- Comp_Type
|
|
-- (System.Atomic_Primitives.Lock_Free_Read_N
|
|
-- (_Object.Comp'Address));
|
|
-- begin
|
|
-- loop
|
|
-- declare
|
|
-- <original declarations before the object renaming declaration
|
|
-- of Comp>
|
|
--
|
|
-- Desired_Comp : Comp_Type := Expected_Comp;
|
|
-- Comp : Comp_Type renames Desired_Comp;
|
|
--
|
|
-- <original delarations after the object renaming declaration
|
|
-- of Comp>
|
|
--
|
|
-- begin
|
|
-- <original statements>
|
|
-- exit when System.Atomic_Primitives.Lock_Free_Try_Write_N
|
|
-- (_Object.Comp'Address,
|
|
-- Interfaces.Unsigned_N (Expected_Comp),
|
|
-- Interfaces.Unsigned_N (Desired_Comp));
|
|
-- end;
|
|
-- end loop;
|
|
-- end P;
|
|
|
|
-- Each return and raise statement of P is transformed into an atomic
|
|
-- status check:
|
|
|
|
-- if System.Atomic_Primitives.Lock_Free_Try_Write_N
|
|
-- (_Object.Comp'Address,
|
|
-- Interfaces.Unsigned_N (Expected_Comp),
|
|
-- Interfaces.Unsigned_N (Desired_Comp));
|
|
-- then
|
|
-- <original statement>
|
|
-- else
|
|
-- goto L0;
|
|
-- end if;
|
|
|
|
-- Functions which meet the lock-free implementation requirements and
|
|
-- reference a unique scalar component Comp are expanded in the following
|
|
-- manner:
|
|
|
|
-- function F (...) return ... is
|
|
-- <original declarations before the object renaming declaration
|
|
-- of Comp>
|
|
--
|
|
-- Expected_Comp : constant Comp_Type :=
|
|
-- Comp_Type
|
|
-- (System.Atomic_Primitives.Lock_Free_Read_N
|
|
-- (_Object.Comp'Address));
|
|
-- Comp : Comp_Type renames Expected_Comp;
|
|
--
|
|
-- <original delarations after the object renaming declaration of
|
|
-- Comp>
|
|
--
|
|
-- begin
|
|
-- <original statements>
|
|
-- end F;
|
|
|
|
function Build_Lock_Free_Unprotected_Subprogram_Body
|
|
(N : Node_Id;
|
|
Prot_Typ : Node_Id) return Node_Id
|
|
is
|
|
function Referenced_Component (N : Node_Id) return Entity_Id;
|
|
-- Subprograms which meet the lock-free implementation criteria are
|
|
-- allowed to reference only one unique component. Return the prival
|
|
-- of the said component.
|
|
|
|
--------------------------
|
|
-- Referenced_Component --
|
|
--------------------------
|
|
|
|
function Referenced_Component (N : Node_Id) return Entity_Id is
|
|
Comp : Entity_Id;
|
|
Decl : Node_Id;
|
|
Source_Comp : Entity_Id := Empty;
|
|
|
|
begin
|
|
-- Find the unique source component which N references in its
|
|
-- statements.
|
|
|
|
for Index in 1 .. Lock_Free_Subprogram_Table.Last loop
|
|
declare
|
|
Element : Lock_Free_Subprogram renames
|
|
Lock_Free_Subprogram_Table.Table (Index);
|
|
begin
|
|
if Element.Sub_Body = N then
|
|
Source_Comp := Element.Comp_Id;
|
|
exit;
|
|
end if;
|
|
end;
|
|
end loop;
|
|
|
|
if No (Source_Comp) then
|
|
return Empty;
|
|
end if;
|
|
|
|
-- Find the prival which corresponds to the source component within
|
|
-- the declarations of N.
|
|
|
|
Decl := First (Declarations (N));
|
|
while Present (Decl) loop
|
|
|
|
-- Privals appear as object renamings
|
|
|
|
if Nkind (Decl) = N_Object_Renaming_Declaration then
|
|
Comp := Defining_Identifier (Decl);
|
|
|
|
if Present (Prival_Link (Comp))
|
|
and then Prival_Link (Comp) = Source_Comp
|
|
then
|
|
return Comp;
|
|
end if;
|
|
end if;
|
|
|
|
Next (Decl);
|
|
end loop;
|
|
|
|
return Empty;
|
|
end Referenced_Component;
|
|
|
|
-- Local variables
|
|
|
|
Comp : constant Entity_Id := Referenced_Component (N);
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Hand_Stmt_Seq : Node_Id := Handled_Statement_Sequence (N);
|
|
Decls : List_Id := Declarations (N);
|
|
|
|
-- Start of processing for Build_Lock_Free_Unprotected_Subprogram_Body
|
|
|
|
begin
|
|
-- Add renamings for the protection object, discriminals, privals, and
|
|
-- the entry index constant for use by debugger.
|
|
|
|
Debug_Private_Data_Declarations (Decls);
|
|
|
|
-- Perform the lock-free expansion when the subprogram references a
|
|
-- protected component.
|
|
|
|
if Present (Comp) then
|
|
Protected_Component_Ref : declare
|
|
Comp_Decl : constant Node_Id := Parent (Comp);
|
|
Comp_Sel_Nam : constant Node_Id := Name (Comp_Decl);
|
|
Comp_Type : constant Entity_Id := Etype (Comp);
|
|
|
|
Is_Procedure : constant Boolean :=
|
|
Ekind (Corresponding_Spec (N)) = E_Procedure;
|
|
-- Indicates if N is a protected procedure body
|
|
|
|
Block_Decls : List_Id;
|
|
Try_Write : Entity_Id;
|
|
Desired_Comp : Entity_Id;
|
|
Decl : Node_Id;
|
|
Label : Node_Id;
|
|
Label_Id : Entity_Id := Empty;
|
|
Read : Entity_Id;
|
|
Expected_Comp : Entity_Id;
|
|
Stmt : Node_Id;
|
|
Stmts : List_Id :=
|
|
New_Copy_List (Statements (Hand_Stmt_Seq));
|
|
Typ_Size : Int;
|
|
Unsigned : Entity_Id;
|
|
|
|
function Process_Node (N : Node_Id) return Traverse_Result;
|
|
-- Transform a single node if it is a return statement, a raise
|
|
-- statement or a reference to Comp.
|
|
|
|
procedure Process_Stmts (Stmts : List_Id);
|
|
-- Given a statement sequence Stmts, wrap any return or raise
|
|
-- statements in the following manner:
|
|
--
|
|
-- if System.Atomic_Primitives.Lock_Free_Try_Write_N
|
|
-- (_Object.Comp'Address,
|
|
-- Interfaces.Unsigned_N (Expected_Comp),
|
|
-- Interfaces.Unsigned_N (Desired_Comp))
|
|
-- then
|
|
-- <Stmt>;
|
|
-- else
|
|
-- goto L0;
|
|
-- end if;
|
|
|
|
------------------
|
|
-- Process_Node --
|
|
------------------
|
|
|
|
function Process_Node (N : Node_Id) return Traverse_Result is
|
|
|
|
procedure Wrap_Statement (Stmt : Node_Id);
|
|
-- Wrap an arbitrary statement inside an if statement where the
|
|
-- condition does an atomic check on the state of the object.
|
|
|
|
--------------------
|
|
-- Wrap_Statement --
|
|
--------------------
|
|
|
|
procedure Wrap_Statement (Stmt : Node_Id) is
|
|
begin
|
|
-- The first time through, create the declaration of a label
|
|
-- which is used to skip the remainder of source statements
|
|
-- if the state of the object has changed.
|
|
|
|
if No (Label_Id) then
|
|
Label_Id :=
|
|
Make_Identifier (Loc, New_External_Name ('L', 0));
|
|
Set_Entity (Label_Id,
|
|
Make_Defining_Identifier (Loc, Chars (Label_Id)));
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- if System.Atomic_Primitives.Lock_Free_Try_Write_N
|
|
-- (_Object.Comp'Address,
|
|
-- Interfaces.Unsigned_N (Expected_Comp),
|
|
-- Interfaces.Unsigned_N (Desired_Comp))
|
|
-- then
|
|
-- <Stmt>;
|
|
-- else
|
|
-- goto L0;
|
|
-- end if;
|
|
|
|
Rewrite (Stmt,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Try_Write, Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Relocate_Node (Comp_Sel_Nam),
|
|
Attribute_Name => Name_Address),
|
|
|
|
Unchecked_Convert_To (Unsigned,
|
|
New_Occurrence_Of (Expected_Comp, Loc)),
|
|
|
|
Unchecked_Convert_To (Unsigned,
|
|
New_Occurrence_Of (Desired_Comp, Loc)))),
|
|
|
|
Then_Statements => New_List (Relocate_Node (Stmt)),
|
|
|
|
Else_Statements => New_List (
|
|
Make_Goto_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Entity (Label_Id), Loc)))));
|
|
end Wrap_Statement;
|
|
|
|
-- Start of processing for Process_Node
|
|
|
|
begin
|
|
-- Wrap each return and raise statement that appear inside a
|
|
-- procedure. Skip the last return statement which is added by
|
|
-- default since it is transformed into an exit statement.
|
|
|
|
if Is_Procedure
|
|
and then ((Nkind (N) = N_Simple_Return_Statement
|
|
and then N /= Last (Stmts))
|
|
or else Nkind (N) = N_Extended_Return_Statement
|
|
or else (Nkind_In (N, N_Raise_Constraint_Error,
|
|
N_Raise_Program_Error,
|
|
N_Raise_Statement,
|
|
N_Raise_Storage_Error)
|
|
and then Comes_From_Source (N)))
|
|
then
|
|
Wrap_Statement (N);
|
|
return Skip;
|
|
end if;
|
|
|
|
-- Force reanalysis
|
|
|
|
Set_Analyzed (N, False);
|
|
|
|
return OK;
|
|
end Process_Node;
|
|
|
|
procedure Process_Nodes is new Traverse_Proc (Process_Node);
|
|
|
|
-------------------
|
|
-- Process_Stmts --
|
|
-------------------
|
|
|
|
procedure Process_Stmts (Stmts : List_Id) is
|
|
Stmt : Node_Id;
|
|
begin
|
|
Stmt := First (Stmts);
|
|
while Present (Stmt) loop
|
|
Process_Nodes (Stmt);
|
|
Next (Stmt);
|
|
end loop;
|
|
end Process_Stmts;
|
|
|
|
-- Start of processing for Protected_Component_Ref
|
|
|
|
begin
|
|
-- Get the type size
|
|
|
|
if Known_Static_Esize (Comp_Type) then
|
|
Typ_Size := UI_To_Int (Esize (Comp_Type));
|
|
|
|
-- If the Esize (Object_Size) is unknown at compile time, look at
|
|
-- the RM_Size (Value_Size) since it may have been set by an
|
|
-- explicit representation clause.
|
|
|
|
elsif Known_Static_RM_Size (Comp_Type) then
|
|
Typ_Size := UI_To_Int (RM_Size (Comp_Type));
|
|
|
|
-- Should not happen since this has already been checked in
|
|
-- Allows_Lock_Free_Implementation (see Sem_Ch9).
|
|
|
|
else
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
-- Retrieve all relevant atomic routines and types
|
|
|
|
case Typ_Size is
|
|
when 8 =>
|
|
Try_Write := RTE (RE_Lock_Free_Try_Write_8);
|
|
Read := RTE (RE_Lock_Free_Read_8);
|
|
Unsigned := RTE (RE_Uint8);
|
|
|
|
when 16 =>
|
|
Try_Write := RTE (RE_Lock_Free_Try_Write_16);
|
|
Read := RTE (RE_Lock_Free_Read_16);
|
|
Unsigned := RTE (RE_Uint16);
|
|
|
|
when 32 =>
|
|
Try_Write := RTE (RE_Lock_Free_Try_Write_32);
|
|
Read := RTE (RE_Lock_Free_Read_32);
|
|
Unsigned := RTE (RE_Uint32);
|
|
|
|
when 64 =>
|
|
Try_Write := RTE (RE_Lock_Free_Try_Write_64);
|
|
Read := RTE (RE_Lock_Free_Read_64);
|
|
Unsigned := RTE (RE_Uint64);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- Generate:
|
|
-- Expected_Comp : constant Comp_Type :=
|
|
-- Comp_Type
|
|
-- (System.Atomic_Primitives.Lock_Free_Read_N
|
|
-- (_Object.Comp'Address));
|
|
|
|
Expected_Comp :=
|
|
Make_Defining_Identifier (Loc,
|
|
New_External_Name (Chars (Comp), Suffix => "_saved"));
|
|
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Expected_Comp,
|
|
Object_Definition => New_Occurrence_Of (Comp_Type, Loc),
|
|
Constant_Present => True,
|
|
Expression =>
|
|
Unchecked_Convert_To (Comp_Type,
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (Read, Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Relocate_Node (Comp_Sel_Nam),
|
|
Attribute_Name => Name_Address)))));
|
|
|
|
-- Protected procedures
|
|
|
|
if Is_Procedure then
|
|
-- Move the original declarations inside the generated block
|
|
|
|
Block_Decls := Decls;
|
|
|
|
-- Reset the declarations list of the protected procedure to
|
|
-- contain only Decl.
|
|
|
|
Decls := New_List (Decl);
|
|
|
|
-- Generate:
|
|
-- Desired_Comp : Comp_Type := Expected_Comp;
|
|
|
|
Desired_Comp :=
|
|
Make_Defining_Identifier (Loc,
|
|
New_External_Name (Chars (Comp), Suffix => "_current"));
|
|
|
|
-- Insert the declarations of Expected_Comp and Desired_Comp in
|
|
-- the block declarations right before the renaming of the
|
|
-- protected component.
|
|
|
|
Insert_Before (Comp_Decl,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Desired_Comp,
|
|
Object_Definition => New_Occurrence_Of (Comp_Type, Loc),
|
|
Expression =>
|
|
New_Occurrence_Of (Expected_Comp, Loc)));
|
|
|
|
-- Protected function
|
|
|
|
else
|
|
Desired_Comp := Expected_Comp;
|
|
|
|
-- Insert the declaration of Expected_Comp in the function
|
|
-- declarations right before the renaming of the protected
|
|
-- component.
|
|
|
|
Insert_Before (Comp_Decl, Decl);
|
|
end if;
|
|
|
|
-- Rewrite the protected component renaming declaration to be a
|
|
-- renaming of Desired_Comp.
|
|
|
|
-- Generate:
|
|
-- Comp : Comp_Type renames Desired_Comp;
|
|
|
|
Rewrite (Comp_Decl,
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Defining_Identifier (Comp_Decl),
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Comp_Type, Loc),
|
|
Name =>
|
|
New_Occurrence_Of (Desired_Comp, Loc)));
|
|
|
|
-- Wrap any return or raise statements in Stmts in same the manner
|
|
-- described in Process_Stmts.
|
|
|
|
Process_Stmts (Stmts);
|
|
|
|
-- Generate:
|
|
-- exit when System.Atomic_Primitives.Lock_Free_Try_Write_N
|
|
-- (_Object.Comp'Address,
|
|
-- Interfaces.Unsigned_N (Expected_Comp),
|
|
-- Interfaces.Unsigned_N (Desired_Comp))
|
|
|
|
if Is_Procedure then
|
|
Stmt :=
|
|
Make_Exit_Statement (Loc,
|
|
Condition =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Try_Write, Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Relocate_Node (Comp_Sel_Nam),
|
|
Attribute_Name => Name_Address),
|
|
|
|
Unchecked_Convert_To (Unsigned,
|
|
New_Occurrence_Of (Expected_Comp, Loc)),
|
|
|
|
Unchecked_Convert_To (Unsigned,
|
|
New_Occurrence_Of (Desired_Comp, Loc)))));
|
|
|
|
-- Small optimization: transform the default return statement
|
|
-- of a procedure into the atomic exit statement.
|
|
|
|
if Nkind (Last (Stmts)) = N_Simple_Return_Statement then
|
|
Rewrite (Last (Stmts), Stmt);
|
|
else
|
|
Append_To (Stmts, Stmt);
|
|
end if;
|
|
end if;
|
|
|
|
-- Create the declaration of the label used to skip the rest of
|
|
-- the source statements when the object state changes.
|
|
|
|
if Present (Label_Id) then
|
|
Label := Make_Label (Loc, Label_Id);
|
|
Append_To (Decls,
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Entity (Label_Id),
|
|
Label_Construct => Label));
|
|
Append_To (Stmts, Label);
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- loop
|
|
-- declare
|
|
-- <Decls>
|
|
-- begin
|
|
-- <Stmts>
|
|
-- end;
|
|
-- end loop;
|
|
|
|
if Is_Procedure then
|
|
Stmts :=
|
|
New_List (
|
|
Make_Loop_Statement (Loc,
|
|
Statements => New_List (
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Block_Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Stmts))),
|
|
End_Label => Empty));
|
|
end if;
|
|
|
|
Hand_Stmt_Seq :=
|
|
Make_Handled_Sequence_Of_Statements (Loc, Statements => Stmts);
|
|
end Protected_Component_Ref;
|
|
end if;
|
|
|
|
-- Make an unprotected version of the subprogram for use within the same
|
|
-- object, with new name and extra parameter representing the object.
|
|
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Specification =>
|
|
Build_Protected_Sub_Specification (N, Prot_Typ, Unprotected_Mode),
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence => Hand_Stmt_Seq);
|
|
end Build_Lock_Free_Unprotected_Subprogram_Body;
|
|
|
|
-------------------------
|
|
-- Build_Master_Entity --
|
|
-------------------------
|
|
|
|
procedure Build_Master_Entity (Obj_Or_Typ : Entity_Id) is
|
|
Loc : constant Source_Ptr := Sloc (Obj_Or_Typ);
|
|
Context : Node_Id;
|
|
Context_Id : Entity_Id;
|
|
Decl : Node_Id;
|
|
Decls : List_Id;
|
|
Par : Node_Id;
|
|
|
|
begin
|
|
if Is_Itype (Obj_Or_Typ) then
|
|
Par := Associated_Node_For_Itype (Obj_Or_Typ);
|
|
else
|
|
Par := Parent (Obj_Or_Typ);
|
|
end if;
|
|
|
|
-- When creating a master for a record component which is either a task
|
|
-- or access-to-task, the enclosing record is the master scope and the
|
|
-- proper insertion point is the component list.
|
|
|
|
if Is_Record_Type (Current_Scope) then
|
|
Context := Par;
|
|
Context_Id := Current_Scope;
|
|
Decls := List_Containing (Context);
|
|
|
|
-- Default case for object declarations and access types. Note that the
|
|
-- context is updated to the nearest enclosing body, block, package, or
|
|
-- return statement.
|
|
|
|
else
|
|
Find_Enclosing_Context (Par, Context, Context_Id, Decls);
|
|
end if;
|
|
|
|
-- Do not create a master if one already exists or there is no task
|
|
-- hierarchy.
|
|
|
|
if Has_Master_Entity (Context_Id)
|
|
or else Restriction_Active (No_Task_Hierarchy)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Create a master, generate:
|
|
-- _Master : constant Master_Id := Current_Master.all;
|
|
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uMaster),
|
|
Constant_Present => True,
|
|
Object_Definition => New_Occurrence_Of (RTE (RE_Master_Id), Loc),
|
|
Expression =>
|
|
Make_Explicit_Dereference (Loc,
|
|
New_Occurrence_Of (RTE (RE_Current_Master), Loc)));
|
|
|
|
-- The master is inserted at the start of the declarative list of the
|
|
-- context.
|
|
|
|
Prepend_To (Decls, Decl);
|
|
|
|
-- In certain cases where transient scopes are involved, the immediate
|
|
-- scope is not always the proper master scope. Ensure that the master
|
|
-- declaration and entity appear in the same context.
|
|
|
|
if Context_Id /= Current_Scope then
|
|
Push_Scope (Context_Id);
|
|
Analyze (Decl);
|
|
Pop_Scope;
|
|
else
|
|
Analyze (Decl);
|
|
end if;
|
|
|
|
-- Mark the enclosing scope and its associated construct as being task
|
|
-- masters.
|
|
|
|
Set_Has_Master_Entity (Context_Id);
|
|
|
|
while Present (Context)
|
|
and then Nkind (Context) /= N_Compilation_Unit
|
|
loop
|
|
if Nkind_In (Context, N_Block_Statement,
|
|
N_Subprogram_Body,
|
|
N_Task_Body)
|
|
then
|
|
Set_Is_Task_Master (Context);
|
|
exit;
|
|
|
|
elsif Nkind (Parent (Context)) = N_Subunit then
|
|
Context := Corresponding_Stub (Parent (Context));
|
|
end if;
|
|
|
|
Context := Parent (Context);
|
|
end loop;
|
|
end Build_Master_Entity;
|
|
|
|
---------------------------
|
|
-- Build_Master_Renaming --
|
|
---------------------------
|
|
|
|
procedure Build_Master_Renaming
|
|
(Ptr_Typ : Entity_Id;
|
|
Ins_Nod : Node_Id := Empty)
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (Ptr_Typ);
|
|
Context : Node_Id;
|
|
Master_Decl : Node_Id;
|
|
Master_Id : Entity_Id;
|
|
|
|
begin
|
|
-- Nothing to do if there is no task hierarchy
|
|
|
|
if Restriction_Active (No_Task_Hierarchy) then
|
|
return;
|
|
end if;
|
|
|
|
-- Determine the proper context to insert the master renaming
|
|
|
|
if Present (Ins_Nod) then
|
|
Context := Ins_Nod;
|
|
elsif Is_Itype (Ptr_Typ) then
|
|
Context := Associated_Node_For_Itype (Ptr_Typ);
|
|
else
|
|
Context := Parent (Ptr_Typ);
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- <Ptr_Typ>M : Master_Id renames _Master;
|
|
|
|
Master_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
New_External_Name (Chars (Ptr_Typ), 'M'));
|
|
|
|
Master_Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => Master_Id,
|
|
Subtype_Mark => New_Occurrence_Of (RTE (RE_Master_Id), Loc),
|
|
Name => Make_Identifier (Loc, Name_uMaster));
|
|
|
|
Insert_Action (Context, Master_Decl);
|
|
|
|
-- The renamed master now services the access type
|
|
|
|
Set_Master_Id (Ptr_Typ, Master_Id);
|
|
end Build_Master_Renaming;
|
|
|
|
-----------------------------------------
|
|
-- Build_Private_Protected_Declaration --
|
|
-----------------------------------------
|
|
|
|
function Build_Private_Protected_Declaration
|
|
(N : Node_Id) return Entity_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Body_Id : constant Entity_Id := Defining_Entity (N);
|
|
Decl : Node_Id;
|
|
Plist : List_Id;
|
|
Formal : Entity_Id;
|
|
New_Spec : Node_Id;
|
|
Spec_Id : Entity_Id;
|
|
|
|
begin
|
|
Formal := First_Formal (Body_Id);
|
|
|
|
-- The protected operation always has at least one formal, namely the
|
|
-- object itself, but it is only placed in the parameter list if
|
|
-- expansion is enabled.
|
|
|
|
if Present (Formal) or else Expander_Active then
|
|
Plist := Copy_Parameter_List (Body_Id);
|
|
else
|
|
Plist := No_List;
|
|
end if;
|
|
|
|
if Nkind (Specification (N)) = N_Procedure_Specification then
|
|
New_Spec :=
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name =>
|
|
Make_Defining_Identifier (Sloc (Body_Id),
|
|
Chars => Chars (Body_Id)),
|
|
Parameter_Specifications =>
|
|
Plist);
|
|
else
|
|
New_Spec :=
|
|
Make_Function_Specification (Loc,
|
|
Defining_Unit_Name =>
|
|
Make_Defining_Identifier (Sloc (Body_Id),
|
|
Chars => Chars (Body_Id)),
|
|
Parameter_Specifications => Plist,
|
|
Result_Definition =>
|
|
New_Occurrence_Of (Etype (Body_Id), Loc));
|
|
end if;
|
|
|
|
Decl := Make_Subprogram_Declaration (Loc, Specification => New_Spec);
|
|
Insert_Before (N, Decl);
|
|
Spec_Id := Defining_Unit_Name (New_Spec);
|
|
|
|
-- Indicate that the entity comes from source, to ensure that cross-
|
|
-- reference information is properly generated. The body itself is
|
|
-- rewritten during expansion, and the body entity will not appear in
|
|
-- calls to the operation.
|
|
|
|
Set_Comes_From_Source (Spec_Id, True);
|
|
Analyze (Decl);
|
|
Set_Has_Completion (Spec_Id);
|
|
Set_Convention (Spec_Id, Convention_Protected);
|
|
return Spec_Id;
|
|
end Build_Private_Protected_Declaration;
|
|
|
|
---------------------------
|
|
-- Build_Protected_Entry --
|
|
---------------------------
|
|
|
|
function Build_Protected_Entry
|
|
(N : Node_Id;
|
|
Ent : Entity_Id;
|
|
Pid : Node_Id) return Node_Id
|
|
is
|
|
Bod_Decls : constant List_Id := New_List;
|
|
Decls : constant List_Id := Declarations (N);
|
|
End_Lab : constant Node_Id :=
|
|
End_Label (Handled_Statement_Sequence (N));
|
|
End_Loc : constant Source_Ptr :=
|
|
Sloc (Last (Statements (Handled_Statement_Sequence (N))));
|
|
-- Used for the generated call to Complete_Entry_Body
|
|
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
Bod_Id : Entity_Id;
|
|
Bod_Spec : Node_Id;
|
|
Bod_Stmts : List_Id;
|
|
Complete : Node_Id;
|
|
Ohandle : Node_Id;
|
|
|
|
EH_Loc : Source_Ptr;
|
|
-- Used for the exception handler, inserted at end of the body
|
|
|
|
begin
|
|
-- Set the source location on the exception handler only when debugging
|
|
-- the expanded code (see Make_Implicit_Exception_Handler).
|
|
|
|
if Debug_Generated_Code then
|
|
EH_Loc := End_Loc;
|
|
|
|
-- Otherwise the inserted code should not be visible to the debugger
|
|
|
|
else
|
|
EH_Loc := No_Location;
|
|
end if;
|
|
|
|
Bod_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => Chars (Protected_Body_Subprogram (Ent)));
|
|
Bod_Spec := Build_Protected_Entry_Specification (Loc, Bod_Id, Empty);
|
|
|
|
-- Add the following declarations:
|
|
|
|
-- type poVP is access poV;
|
|
-- _object : poVP := poVP (_O);
|
|
|
|
-- where _O is the formal parameter associated with the concurrent
|
|
-- object. These declarations are needed for Complete_Entry_Body.
|
|
|
|
Add_Object_Pointer (Loc, Pid, Bod_Decls);
|
|
|
|
-- Add renamings for all formals, the Protection object, discriminals,
|
|
-- privals and the entry index constant for use by debugger.
|
|
|
|
Add_Formal_Renamings (Bod_Spec, Bod_Decls, Ent, Loc);
|
|
Debug_Private_Data_Declarations (Decls);
|
|
|
|
-- Put the declarations and the statements from the entry
|
|
|
|
Bod_Stmts :=
|
|
New_List (
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence => Handled_Statement_Sequence (N)));
|
|
|
|
case Corresponding_Runtime_Package (Pid) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Append_To (Bod_Stmts,
|
|
Make_Procedure_Call_Statement (End_Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Complete_Entry_Body), Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (End_Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (End_Loc,
|
|
Prefix =>
|
|
Make_Identifier (End_Loc, Name_uObject),
|
|
Selector_Name =>
|
|
Make_Identifier (End_Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access))));
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
|
|
-- Historically, a call to Complete_Single_Entry_Body was
|
|
-- inserted, but it was a null procedure.
|
|
|
|
null;
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- When exceptions can not be propagated, we never need to call
|
|
-- Exception_Complete_Entry_Body.
|
|
|
|
if No_Exception_Handlers_Set then
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Specification => Bod_Spec,
|
|
Declarations => Bod_Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Bod_Stmts,
|
|
End_Label => End_Lab));
|
|
|
|
else
|
|
Ohandle := Make_Others_Choice (Loc);
|
|
Set_All_Others (Ohandle);
|
|
|
|
case Corresponding_Runtime_Package (Pid) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Complete :=
|
|
New_Occurrence_Of
|
|
(RTE (RE_Exceptional_Complete_Entry_Body), Loc);
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Complete :=
|
|
New_Occurrence_Of
|
|
(RTE (RE_Exceptional_Complete_Single_Entry_Body), Loc);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- Establish link between subprogram body entity and source entry
|
|
|
|
Set_Corresponding_Protected_Entry (Bod_Id, Ent);
|
|
|
|
-- Create body of entry procedure. The renaming declarations are
|
|
-- placed ahead of the block that contains the actual entry body.
|
|
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Specification => Bod_Spec,
|
|
Declarations => Bod_Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Bod_Stmts,
|
|
End_Label => End_Lab,
|
|
Exception_Handlers => New_List (
|
|
Make_Implicit_Exception_Handler (EH_Loc,
|
|
Exception_Choices => New_List (Ohandle),
|
|
|
|
Statements => New_List (
|
|
Make_Procedure_Call_Statement (EH_Loc,
|
|
Name => Complete,
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (EH_Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (EH_Loc,
|
|
Prefix =>
|
|
Make_Identifier (EH_Loc, Name_uObject),
|
|
Selector_Name =>
|
|
Make_Identifier (EH_Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access),
|
|
|
|
Make_Function_Call (EH_Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Get_GNAT_Exception), Loc)))))))));
|
|
end if;
|
|
end Build_Protected_Entry;
|
|
|
|
-----------------------------------------
|
|
-- Build_Protected_Entry_Specification --
|
|
-----------------------------------------
|
|
|
|
function Build_Protected_Entry_Specification
|
|
(Loc : Source_Ptr;
|
|
Def_Id : Entity_Id;
|
|
Ent_Id : Entity_Id) return Node_Id
|
|
is
|
|
P : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uP);
|
|
|
|
begin
|
|
Set_Debug_Info_Needed (Def_Id);
|
|
|
|
if Present (Ent_Id) then
|
|
Append_Elmt (P, Accept_Address (Ent_Id));
|
|
end if;
|
|
|
|
return
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name => Def_Id,
|
|
Parameter_Specifications => New_List (
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uO),
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc)),
|
|
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier => P,
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc)),
|
|
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uE),
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (RTE (RE_Protected_Entry_Index), Loc))));
|
|
end Build_Protected_Entry_Specification;
|
|
|
|
--------------------------
|
|
-- Build_Protected_Spec --
|
|
--------------------------
|
|
|
|
function Build_Protected_Spec
|
|
(N : Node_Id;
|
|
Obj_Type : Entity_Id;
|
|
Ident : Entity_Id;
|
|
Unprotected : Boolean := False) return List_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Decl : Node_Id;
|
|
Formal : Entity_Id;
|
|
New_Plist : List_Id;
|
|
New_Param : Node_Id;
|
|
|
|
begin
|
|
New_Plist := New_List;
|
|
|
|
Formal := First_Formal (Ident);
|
|
while Present (Formal) loop
|
|
New_Param :=
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Sloc (Formal), Chars (Formal)),
|
|
Aliased_Present => Aliased_Present (Parent (Formal)),
|
|
In_Present => In_Present (Parent (Formal)),
|
|
Out_Present => Out_Present (Parent (Formal)),
|
|
Parameter_Type => New_Occurrence_Of (Etype (Formal), Loc));
|
|
|
|
if Unprotected then
|
|
Set_Protected_Formal (Formal, Defining_Identifier (New_Param));
|
|
end if;
|
|
|
|
Append (New_Param, New_Plist);
|
|
Next_Formal (Formal);
|
|
end loop;
|
|
|
|
-- If the subprogram is a procedure and the context is not an access
|
|
-- to protected subprogram, the parameter is in-out. Otherwise it is
|
|
-- an in parameter.
|
|
|
|
Decl :=
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uObject),
|
|
In_Present => True,
|
|
Out_Present =>
|
|
(Etype (Ident) = Standard_Void_Type
|
|
and then not Is_RTE (Obj_Type, RE_Address)),
|
|
Parameter_Type =>
|
|
New_Occurrence_Of (Obj_Type, Loc));
|
|
Set_Debug_Info_Needed (Defining_Identifier (Decl));
|
|
Prepend_To (New_Plist, Decl);
|
|
|
|
return New_Plist;
|
|
end Build_Protected_Spec;
|
|
|
|
---------------------------------------
|
|
-- Build_Protected_Sub_Specification --
|
|
---------------------------------------
|
|
|
|
function Build_Protected_Sub_Specification
|
|
(N : Node_Id;
|
|
Prot_Typ : Entity_Id;
|
|
Mode : Subprogram_Protection_Mode) return Node_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Decl : Node_Id;
|
|
Def_Id : Entity_Id;
|
|
New_Id : Entity_Id;
|
|
New_Plist : List_Id;
|
|
New_Spec : Node_Id;
|
|
|
|
Append_Chr : constant array (Subprogram_Protection_Mode) of Character :=
|
|
(Dispatching_Mode => ' ',
|
|
Protected_Mode => 'P',
|
|
Unprotected_Mode => 'N');
|
|
|
|
begin
|
|
if Ekind (Defining_Unit_Name (Specification (N))) = E_Subprogram_Body
|
|
then
|
|
Decl := Unit_Declaration_Node (Corresponding_Spec (N));
|
|
else
|
|
Decl := N;
|
|
end if;
|
|
|
|
Def_Id := Defining_Unit_Name (Specification (Decl));
|
|
|
|
New_Plist :=
|
|
Build_Protected_Spec
|
|
(Decl, Corresponding_Record_Type (Prot_Typ), Def_Id,
|
|
Mode = Unprotected_Mode);
|
|
New_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => Build_Selected_Name (Prot_Typ, Def_Id, Append_Chr (Mode)));
|
|
|
|
-- Reference the original nondispatching subprogram since the analysis
|
|
-- of the object.operation notation may need its original name (see
|
|
-- Sem_Ch4.Names_Match).
|
|
|
|
if Mode = Dispatching_Mode then
|
|
Set_Ekind (New_Id, Ekind (Def_Id));
|
|
Set_Original_Protected_Subprogram (New_Id, Def_Id);
|
|
end if;
|
|
|
|
-- The unprotected operation carries the user code, and debugging
|
|
-- information must be generated for it, even though this spec does
|
|
-- not come from source. It is also convenient to allow gdb to step
|
|
-- into the protected operation, even though it only contains lock/
|
|
-- unlock calls.
|
|
|
|
Set_Debug_Info_Needed (New_Id);
|
|
|
|
-- If a pragma Eliminate applies to the source entity, the internal
|
|
-- subprograms will be eliminated as well.
|
|
|
|
Set_Is_Eliminated (New_Id, Is_Eliminated (Def_Id));
|
|
|
|
if Nkind (Specification (Decl)) = N_Procedure_Specification then
|
|
New_Spec :=
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name => New_Id,
|
|
Parameter_Specifications => New_Plist);
|
|
|
|
-- Create a new specification for the anonymous subprogram type
|
|
|
|
else
|
|
New_Spec :=
|
|
Make_Function_Specification (Loc,
|
|
Defining_Unit_Name => New_Id,
|
|
Parameter_Specifications => New_Plist,
|
|
Result_Definition =>
|
|
Copy_Result_Type (Result_Definition (Specification (Decl))));
|
|
|
|
Set_Return_Present (Defining_Unit_Name (New_Spec));
|
|
end if;
|
|
|
|
return New_Spec;
|
|
end Build_Protected_Sub_Specification;
|
|
|
|
-------------------------------------
|
|
-- Build_Protected_Subprogram_Body --
|
|
-------------------------------------
|
|
|
|
function Build_Protected_Subprogram_Body
|
|
(N : Node_Id;
|
|
Pid : Node_Id;
|
|
N_Op_Spec : Node_Id) return Node_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Op_Spec : Node_Id;
|
|
P_Op_Spec : Node_Id;
|
|
Uactuals : List_Id;
|
|
Pformal : Node_Id;
|
|
Unprot_Call : Node_Id;
|
|
Sub_Body : Node_Id;
|
|
Lock_Name : Node_Id;
|
|
Lock_Stmt : Node_Id;
|
|
R : Node_Id;
|
|
Return_Stmt : Node_Id := Empty; -- init to avoid gcc 3 warning
|
|
Pre_Stmts : List_Id := No_List; -- init to avoid gcc 3 warning
|
|
Stmts : List_Id;
|
|
Object_Parm : Node_Id;
|
|
Exc_Safe : Boolean;
|
|
Lock_Kind : RE_Id;
|
|
|
|
begin
|
|
Op_Spec := Specification (N);
|
|
Exc_Safe := Is_Exception_Safe (N);
|
|
|
|
P_Op_Spec :=
|
|
Build_Protected_Sub_Specification (N, Pid, Protected_Mode);
|
|
|
|
-- Build a list of the formal parameters of the protected version of
|
|
-- the subprogram to use as the actual parameters of the unprotected
|
|
-- version.
|
|
|
|
Uactuals := New_List;
|
|
Pformal := First (Parameter_Specifications (P_Op_Spec));
|
|
while Present (Pformal) loop
|
|
Append_To (Uactuals,
|
|
Make_Identifier (Loc, Chars (Defining_Identifier (Pformal))));
|
|
Next (Pformal);
|
|
end loop;
|
|
|
|
-- Make a call to the unprotected version of the subprogram built above
|
|
-- for use by the protected version built below.
|
|
|
|
if Nkind (Op_Spec) = N_Function_Specification then
|
|
if Exc_Safe then
|
|
R := Make_Temporary (Loc, 'R');
|
|
|
|
Unprot_Call :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => R,
|
|
Constant_Present => True,
|
|
Object_Definition =>
|
|
New_Copy (Result_Definition (N_Op_Spec)),
|
|
Expression =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
Make_Identifier (Loc,
|
|
Chars => Chars (Defining_Unit_Name (N_Op_Spec))),
|
|
Parameter_Associations => Uactuals));
|
|
|
|
Return_Stmt :=
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression => New_Occurrence_Of (R, Loc));
|
|
|
|
else
|
|
Unprot_Call :=
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
Make_Identifier (Loc,
|
|
Chars => Chars (Defining_Unit_Name (N_Op_Spec))),
|
|
Parameter_Associations => Uactuals));
|
|
end if;
|
|
|
|
Lock_Kind := RE_Lock_Read_Only;
|
|
|
|
else
|
|
Unprot_Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
Make_Identifier (Loc, Chars (Defining_Unit_Name (N_Op_Spec))),
|
|
Parameter_Associations => Uactuals);
|
|
|
|
Lock_Kind := RE_Lock;
|
|
end if;
|
|
|
|
-- Wrap call in block that will be covered by an at_end handler
|
|
|
|
if not Exc_Safe then
|
|
Unprot_Call :=
|
|
Make_Block_Statement (Loc,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Unprot_Call)));
|
|
end if;
|
|
|
|
-- Make the protected subprogram body. This locks the protected
|
|
-- object and calls the unprotected version of the subprogram.
|
|
|
|
case Corresponding_Runtime_Package (Pid) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Lock_Name := New_Occurrence_Of (RTE (RE_Lock_Entries), Loc);
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Lock_Name := New_Occurrence_Of (RTE (RE_Lock_Entry), Loc);
|
|
|
|
when System_Tasking_Protected_Objects =>
|
|
Lock_Name := New_Occurrence_Of (RTE (Lock_Kind), Loc);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
Object_Parm :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uObject),
|
|
Selector_Name => Make_Identifier (Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access);
|
|
|
|
Lock_Stmt :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Lock_Name,
|
|
Parameter_Associations => New_List (Object_Parm));
|
|
|
|
if Abort_Allowed then
|
|
Stmts := New_List (
|
|
Build_Runtime_Call (Loc, RE_Abort_Defer),
|
|
Lock_Stmt);
|
|
|
|
else
|
|
Stmts := New_List (Lock_Stmt);
|
|
end if;
|
|
|
|
if not Exc_Safe then
|
|
Append (Unprot_Call, Stmts);
|
|
else
|
|
if Nkind (Op_Spec) = N_Function_Specification then
|
|
Pre_Stmts := Stmts;
|
|
Stmts := Empty_List;
|
|
else
|
|
Append (Unprot_Call, Stmts);
|
|
end if;
|
|
|
|
-- Historical note: Previously, call to the cleanup was inserted
|
|
-- here. This is now done by Build_Protected_Subprogram_Call_Cleanup,
|
|
-- which is also shared by the 'not Exc_Safe' path.
|
|
|
|
Build_Protected_Subprogram_Call_Cleanup (Op_Spec, Pid, Loc, Stmts);
|
|
|
|
if Nkind (Op_Spec) = N_Function_Specification then
|
|
Append_To (Stmts, Return_Stmt);
|
|
Append_To (Pre_Stmts,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => New_List (Unprot_Call),
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Stmts)));
|
|
Stmts := Pre_Stmts;
|
|
end if;
|
|
end if;
|
|
|
|
Sub_Body :=
|
|
Make_Subprogram_Body (Loc,
|
|
Declarations => Empty_List,
|
|
Specification => P_Op_Spec,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Statements => Stmts));
|
|
|
|
-- Mark this subprogram as a protected subprogram body so that the
|
|
-- cleanup will be inserted. This is done only in the 'not Exc_Safe'
|
|
-- path as otherwise the cleanup has already been inserted.
|
|
|
|
if not Exc_Safe then
|
|
Set_Is_Protected_Subprogram_Body (Sub_Body);
|
|
end if;
|
|
|
|
return Sub_Body;
|
|
end Build_Protected_Subprogram_Body;
|
|
|
|
-------------------------------------
|
|
-- Build_Protected_Subprogram_Call --
|
|
-------------------------------------
|
|
|
|
procedure Build_Protected_Subprogram_Call
|
|
(N : Node_Id;
|
|
Name : Node_Id;
|
|
Rec : Node_Id;
|
|
External : Boolean := True)
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Sub : constant Entity_Id := Entity (Name);
|
|
New_Sub : Node_Id;
|
|
Params : List_Id;
|
|
|
|
begin
|
|
if External then
|
|
New_Sub := New_Occurrence_Of (External_Subprogram (Sub), Loc);
|
|
else
|
|
New_Sub :=
|
|
New_Occurrence_Of (Protected_Body_Subprogram (Sub), Loc);
|
|
end if;
|
|
|
|
if Present (Parameter_Associations (N)) then
|
|
Params := New_Copy_List_Tree (Parameter_Associations (N));
|
|
else
|
|
Params := New_List;
|
|
end if;
|
|
|
|
-- If the type is an untagged derived type, convert to the root type,
|
|
-- which is the one on which the operations are defined.
|
|
|
|
if Nkind (Rec) = N_Unchecked_Type_Conversion
|
|
and then not Is_Tagged_Type (Etype (Rec))
|
|
and then Is_Derived_Type (Etype (Rec))
|
|
then
|
|
Set_Etype (Rec, Root_Type (Etype (Rec)));
|
|
Set_Subtype_Mark (Rec,
|
|
New_Occurrence_Of (Root_Type (Etype (Rec)), Sloc (N)));
|
|
end if;
|
|
|
|
Prepend (Rec, Params);
|
|
|
|
if Ekind (Sub) = E_Procedure then
|
|
Rewrite (N,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Sub,
|
|
Parameter_Associations => Params));
|
|
|
|
else
|
|
pragma Assert (Ekind (Sub) = E_Function);
|
|
Rewrite (N,
|
|
Make_Function_Call (Loc,
|
|
Name => New_Sub,
|
|
Parameter_Associations => Params));
|
|
|
|
-- Preserve type of call for subsequent processing (required for
|
|
-- call to Wrap_Transient_Expression in the case of a shared passive
|
|
-- protected).
|
|
|
|
Set_Etype (N, Etype (New_Sub));
|
|
end if;
|
|
|
|
if External
|
|
and then Nkind (Rec) = N_Unchecked_Type_Conversion
|
|
and then Is_Entity_Name (Expression (Rec))
|
|
and then Is_Shared_Passive (Entity (Expression (Rec)))
|
|
then
|
|
Add_Shared_Var_Lock_Procs (N);
|
|
end if;
|
|
end Build_Protected_Subprogram_Call;
|
|
|
|
---------------------------------------------
|
|
-- Build_Protected_Subprogram_Call_Cleanup --
|
|
---------------------------------------------
|
|
|
|
procedure Build_Protected_Subprogram_Call_Cleanup
|
|
(Op_Spec : Node_Id;
|
|
Conc_Typ : Node_Id;
|
|
Loc : Source_Ptr;
|
|
Stmts : List_Id)
|
|
is
|
|
Nam : Node_Id;
|
|
|
|
begin
|
|
-- If the associated protected object has entries, a protected
|
|
-- procedure has to service entry queues. In this case generate:
|
|
|
|
-- Service_Entries (_object._object'Access);
|
|
|
|
if Nkind (Op_Spec) = N_Procedure_Specification
|
|
and then Has_Entries (Conc_Typ)
|
|
then
|
|
case Corresponding_Runtime_Package (Conc_Typ) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Nam := New_Occurrence_Of (RTE (RE_Service_Entries), Loc);
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Nam := New_Occurrence_Of (RTE (RE_Service_Entry), Loc);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
Append_To (Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Nam,
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uObject),
|
|
Selector_Name => Make_Identifier (Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access))));
|
|
|
|
else
|
|
-- Generate:
|
|
-- Unlock (_object._object'Access);
|
|
|
|
case Corresponding_Runtime_Package (Conc_Typ) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Nam := New_Occurrence_Of (RTE (RE_Unlock_Entries), Loc);
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Nam := New_Occurrence_Of (RTE (RE_Unlock_Entry), Loc);
|
|
|
|
when System_Tasking_Protected_Objects =>
|
|
Nam := New_Occurrence_Of (RTE (RE_Unlock), Loc);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
Append_To (Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Nam,
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uObject),
|
|
Selector_Name => Make_Identifier (Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access))));
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- Abort_Undefer;
|
|
|
|
if Abort_Allowed then
|
|
Append_To (Stmts, Build_Runtime_Call (Loc, RE_Abort_Undefer));
|
|
end if;
|
|
end Build_Protected_Subprogram_Call_Cleanup;
|
|
|
|
-------------------------
|
|
-- Build_Selected_Name --
|
|
-------------------------
|
|
|
|
function Build_Selected_Name
|
|
(Prefix : Entity_Id;
|
|
Selector : Entity_Id;
|
|
Append_Char : Character := ' ') return Name_Id
|
|
is
|
|
Select_Buffer : String (1 .. Hostparm.Max_Name_Length);
|
|
Select_Len : Natural;
|
|
|
|
begin
|
|
Get_Name_String (Chars (Selector));
|
|
Select_Len := Name_Len;
|
|
Select_Buffer (1 .. Select_Len) := Name_Buffer (1 .. Name_Len);
|
|
Get_Name_String (Chars (Prefix));
|
|
|
|
-- If scope is anonymous type, discard suffix to recover name of
|
|
-- single protected object. Otherwise use protected type name.
|
|
|
|
if Name_Buffer (Name_Len) = 'T' then
|
|
Name_Len := Name_Len - 1;
|
|
end if;
|
|
|
|
Add_Str_To_Name_Buffer ("__");
|
|
for J in 1 .. Select_Len loop
|
|
Add_Char_To_Name_Buffer (Select_Buffer (J));
|
|
end loop;
|
|
|
|
-- Now add the Append_Char if specified. The encoding to follow
|
|
-- depends on the type of entity. If Append_Char is either 'N' or 'P',
|
|
-- then the entity is associated to a protected type subprogram.
|
|
-- Otherwise, it is a protected type entry. For each case, the
|
|
-- encoding to follow for the suffix is documented in exp_dbug.ads.
|
|
|
|
-- It would be better to encapsulate this as a routine in Exp_Dbug ???
|
|
|
|
if Append_Char /= ' ' then
|
|
if Append_Char = 'P' or Append_Char = 'N' then
|
|
Add_Char_To_Name_Buffer (Append_Char);
|
|
return Name_Find;
|
|
else
|
|
Add_Str_To_Name_Buffer ((1 => '_', 2 => Append_Char));
|
|
return New_External_Name (Name_Find, ' ', -1);
|
|
end if;
|
|
else
|
|
return Name_Find;
|
|
end if;
|
|
end Build_Selected_Name;
|
|
|
|
-----------------------------
|
|
-- Build_Simple_Entry_Call --
|
|
-----------------------------
|
|
|
|
-- A task entry call is converted to a call to Call_Simple
|
|
|
|
-- declare
|
|
-- P : parms := (parm, parm, parm);
|
|
-- begin
|
|
-- Call_Simple (acceptor-task, entry-index, P'Address);
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- end;
|
|
|
|
-- Here Pnn is an aggregate of the type constructed for the entry to hold
|
|
-- the parameters, and the constructed aggregate value contains either the
|
|
-- parameters or, in the case of non-elementary types, references to these
|
|
-- parameters. Then the address of this aggregate is passed to the runtime
|
|
-- routine, along with the task id value and the task entry index value.
|
|
-- Pnn is only required if parameters are present.
|
|
|
|
-- The assignments after the call are present only in the case of in-out
|
|
-- or out parameters for elementary types, and are used to assign back the
|
|
-- resulting values of such parameters.
|
|
|
|
-- Note: the reason that we insert a block here is that in the context
|
|
-- of selects, conditional entry calls etc. the entry call statement
|
|
-- appears on its own, not as an element of a list.
|
|
|
|
-- A protected entry call is converted to a Protected_Entry_Call:
|
|
|
|
-- declare
|
|
-- P : E1_Params := (param, param, param);
|
|
-- Pnn : Boolean;
|
|
-- Bnn : Communications_Block;
|
|
|
|
-- declare
|
|
-- P : E1_Params := (param, param, param);
|
|
-- Bnn : Communications_Block;
|
|
|
|
-- begin
|
|
-- Protected_Entry_Call (
|
|
-- Object => po._object'Access,
|
|
-- E => <entry index>;
|
|
-- Uninterpreted_Data => P'Address;
|
|
-- Mode => Simple_Call;
|
|
-- Block => Bnn);
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- end;
|
|
|
|
procedure Build_Simple_Entry_Call
|
|
(N : Node_Id;
|
|
Concval : Node_Id;
|
|
Ename : Node_Id;
|
|
Index : Node_Id)
|
|
is
|
|
begin
|
|
Expand_Call (N);
|
|
|
|
-- If call has been inlined, nothing left to do
|
|
|
|
if Nkind (N) = N_Block_Statement then
|
|
return;
|
|
end if;
|
|
|
|
-- Convert entry call to Call_Simple call
|
|
|
|
declare
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Parms : constant List_Id := Parameter_Associations (N);
|
|
Stats : constant List_Id := New_List;
|
|
Actual : Node_Id;
|
|
Call : Node_Id;
|
|
Comm_Name : Entity_Id;
|
|
Conctyp : Node_Id;
|
|
Decls : List_Id;
|
|
Ent : Entity_Id;
|
|
Ent_Acc : Entity_Id;
|
|
Formal : Node_Id;
|
|
Iface_Tag : Entity_Id;
|
|
Iface_Typ : Entity_Id;
|
|
N_Node : Node_Id;
|
|
N_Var : Node_Id;
|
|
P : Entity_Id;
|
|
Parm1 : Node_Id;
|
|
Parm2 : Node_Id;
|
|
Parm3 : Node_Id;
|
|
Pdecl : Node_Id;
|
|
Plist : List_Id;
|
|
X : Entity_Id;
|
|
Xdecl : Node_Id;
|
|
|
|
begin
|
|
-- Simple entry and entry family cases merge here
|
|
|
|
Ent := Entity (Ename);
|
|
Ent_Acc := Entry_Parameters_Type (Ent);
|
|
Conctyp := Etype (Concval);
|
|
|
|
-- If prefix is an access type, dereference to obtain the task type
|
|
|
|
if Is_Access_Type (Conctyp) then
|
|
Conctyp := Designated_Type (Conctyp);
|
|
end if;
|
|
|
|
-- Special case for protected subprogram calls
|
|
|
|
if Is_Protected_Type (Conctyp)
|
|
and then Is_Subprogram (Entity (Ename))
|
|
then
|
|
if not Is_Eliminated (Entity (Ename)) then
|
|
Build_Protected_Subprogram_Call
|
|
(N, Ename, Convert_Concurrent (Concval, Conctyp));
|
|
Analyze (N);
|
|
end if;
|
|
|
|
return;
|
|
end if;
|
|
|
|
-- First parameter is the Task_Id value from the task value or the
|
|
-- Object from the protected object value, obtained by selecting
|
|
-- the _Task_Id or _Object from the result of doing an unchecked
|
|
-- conversion to convert the value to the corresponding record type.
|
|
|
|
if Nkind (Concval) = N_Function_Call
|
|
and then Is_Task_Type (Conctyp)
|
|
and then Ada_Version >= Ada_2005
|
|
then
|
|
declare
|
|
ExpR : constant Node_Id := Relocate_Node (Concval);
|
|
Obj : constant Entity_Id := Make_Temporary (Loc, 'F', ExpR);
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Obj,
|
|
Object_Definition => New_Occurrence_Of (Conctyp, Loc),
|
|
Expression => ExpR);
|
|
Set_Etype (Obj, Conctyp);
|
|
Decls := New_List (Decl);
|
|
Rewrite (Concval, New_Occurrence_Of (Obj, Loc));
|
|
end;
|
|
|
|
else
|
|
Decls := New_List;
|
|
end if;
|
|
|
|
Parm1 := Concurrent_Ref (Concval);
|
|
|
|
-- Second parameter is the entry index, computed by the routine
|
|
-- provided for this purpose. The value of this expression is
|
|
-- assigned to an intermediate variable to assure that any entry
|
|
-- family index expressions are evaluated before the entry
|
|
-- parameters.
|
|
|
|
if not Is_Protected_Type (Conctyp)
|
|
or else
|
|
Corresponding_Runtime_Package (Conctyp) =
|
|
System_Tasking_Protected_Objects_Entries
|
|
then
|
|
X := Make_Defining_Identifier (Loc, Name_uX);
|
|
|
|
Xdecl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => X,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Task_Entry_Index), Loc),
|
|
Expression => Actual_Index_Expression (
|
|
Loc, Entity (Ename), Index, Concval));
|
|
|
|
Append_To (Decls, Xdecl);
|
|
Parm2 := New_Occurrence_Of (X, Loc);
|
|
|
|
else
|
|
Xdecl := Empty;
|
|
Parm2 := Empty;
|
|
end if;
|
|
|
|
-- The third parameter is the packaged parameters. If there are
|
|
-- none, then it is just the null address, since nothing is passed.
|
|
|
|
if No (Parms) then
|
|
Parm3 := New_Occurrence_Of (RTE (RE_Null_Address), Loc);
|
|
P := Empty;
|
|
|
|
-- Case of parameters present, where third argument is the address
|
|
-- of a packaged record containing the required parameter values.
|
|
|
|
else
|
|
-- First build a list of parameter values, which are references to
|
|
-- objects of the parameter types.
|
|
|
|
Plist := New_List;
|
|
|
|
Actual := First_Actual (N);
|
|
Formal := First_Formal (Ent);
|
|
while Present (Actual) loop
|
|
|
|
-- If it is a by-copy type, copy it to a new variable. The
|
|
-- packaged record has a field that points to this variable.
|
|
|
|
if Is_By_Copy_Type (Etype (Actual)) then
|
|
N_Node :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Make_Temporary (Loc, 'J'),
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Etype (Formal), Loc));
|
|
|
|
-- Mark the object as not needing initialization since the
|
|
-- initialization is performed separately, avoiding errors
|
|
-- on cases such as formals of null-excluding access types.
|
|
|
|
Set_No_Initialization (N_Node);
|
|
|
|
-- We must make a separate assignment statement for the
|
|
-- case of limited types. We cannot assign it unless the
|
|
-- Assignment_OK flag is set first. An out formal of an
|
|
-- access type or whose type has a Default_Value must also
|
|
-- be initialized from the actual (see RM 6.4.1 (13-13.1)),
|
|
-- but no constraint, predicate, or null-exclusion check is
|
|
-- applied before the call.
|
|
|
|
if Ekind (Formal) /= E_Out_Parameter
|
|
or else Is_Access_Type (Etype (Formal))
|
|
or else
|
|
(Is_Scalar_Type (Etype (Formal))
|
|
and then
|
|
Present (Default_Aspect_Value (Etype (Formal))))
|
|
then
|
|
N_Var :=
|
|
New_Occurrence_Of (Defining_Identifier (N_Node), Loc);
|
|
Set_Assignment_OK (N_Var);
|
|
Append_To (Stats,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => N_Var,
|
|
Expression => Relocate_Node (Actual)));
|
|
|
|
-- Mark the object as internal, so we don't later reset
|
|
-- No_Initialization flag in Default_Initialize_Object,
|
|
-- which would lead to needless default initialization.
|
|
-- We don't set this outside the if statement, because
|
|
-- out scalar parameters without Default_Value do require
|
|
-- default initialization if Initialize_Scalars applies.
|
|
|
|
Set_Is_Internal (Defining_Identifier (N_Node));
|
|
|
|
-- If actual is an out parameter of a null-excluding
|
|
-- access type, there is access check on entry, so set
|
|
-- Suppress_Assignment_Checks on the generated statement
|
|
-- that assigns the actual to the parameter block
|
|
|
|
Set_Suppress_Assignment_Checks (Last (Stats));
|
|
end if;
|
|
|
|
Append (N_Node, Decls);
|
|
|
|
Append_To (Plist,
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Unchecked_Access,
|
|
Prefix =>
|
|
New_Occurrence_Of
|
|
(Defining_Identifier (N_Node), Loc)));
|
|
|
|
else
|
|
-- Interface class-wide formal
|
|
|
|
if Ada_Version >= Ada_2005
|
|
and then Ekind (Etype (Formal)) = E_Class_Wide_Type
|
|
and then Is_Interface (Etype (Formal))
|
|
then
|
|
Iface_Typ := Etype (Etype (Formal));
|
|
|
|
-- Generate:
|
|
-- formal_iface_type! (actual.iface_tag)'reference
|
|
|
|
Iface_Tag :=
|
|
Find_Interface_Tag (Etype (Actual), Iface_Typ);
|
|
pragma Assert (Present (Iface_Tag));
|
|
|
|
Append_To (Plist,
|
|
Make_Reference (Loc,
|
|
Unchecked_Convert_To (Iface_Typ,
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Relocate_Node (Actual),
|
|
Selector_Name =>
|
|
New_Occurrence_Of (Iface_Tag, Loc)))));
|
|
else
|
|
-- Generate:
|
|
-- actual'reference
|
|
|
|
Append_To (Plist,
|
|
Make_Reference (Loc, Relocate_Node (Actual)));
|
|
end if;
|
|
end if;
|
|
|
|
Next_Actual (Actual);
|
|
Next_Formal_With_Extras (Formal);
|
|
end loop;
|
|
|
|
-- Now build the declaration of parameters initialized with the
|
|
-- aggregate containing this constructed parameter list.
|
|
|
|
P := Make_Defining_Identifier (Loc, Name_uP);
|
|
|
|
Pdecl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => P,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Designated_Type (Ent_Acc), Loc),
|
|
Expression =>
|
|
Make_Aggregate (Loc, Expressions => Plist));
|
|
|
|
Parm3 :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (P, Loc),
|
|
Attribute_Name => Name_Address);
|
|
|
|
Append (Pdecl, Decls);
|
|
end if;
|
|
|
|
-- Now we can create the call, case of protected type
|
|
|
|
if Is_Protected_Type (Conctyp) then
|
|
case Corresponding_Runtime_Package (Conctyp) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
|
|
-- Change the type of the index declaration
|
|
|
|
Set_Object_Definition (Xdecl,
|
|
New_Occurrence_Of (RTE (RE_Protected_Entry_Index), Loc));
|
|
|
|
-- Some additional declarations for protected entry calls
|
|
|
|
if No (Decls) then
|
|
Decls := New_List;
|
|
end if;
|
|
|
|
-- Bnn : Communications_Block;
|
|
|
|
Comm_Name := Make_Temporary (Loc, 'B');
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Comm_Name,
|
|
Object_Definition =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Communication_Block), Loc)));
|
|
|
|
-- Some additional statements for protected entry calls
|
|
|
|
-- Protected_Entry_Call (
|
|
-- Object => po._object'Access,
|
|
-- E => <entry index>;
|
|
-- Uninterpreted_Data => P'Address;
|
|
-- Mode => Simple_Call;
|
|
-- Block => Bnn);
|
|
|
|
Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Protected_Entry_Call), Loc),
|
|
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Unchecked_Access,
|
|
Prefix => Parm1),
|
|
Parm2,
|
|
Parm3,
|
|
New_Occurrence_Of (RTE (RE_Simple_Call), Loc),
|
|
New_Occurrence_Of (Comm_Name, Loc)));
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
-- Protected_Single_Entry_Call (
|
|
-- Object => po._object'Access,
|
|
-- Uninterpreted_Data => P'Address);
|
|
|
|
Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Protected_Single_Entry_Call), Loc),
|
|
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Unchecked_Access,
|
|
Prefix => Parm1),
|
|
Parm3));
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- Case of task type
|
|
|
|
else
|
|
Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Call_Simple), Loc),
|
|
Parameter_Associations => New_List (Parm1, Parm2, Parm3));
|
|
|
|
end if;
|
|
|
|
Append_To (Stats, Call);
|
|
|
|
-- If there are out or in/out parameters by copy add assignment
|
|
-- statements for the result values.
|
|
|
|
if Present (Parms) then
|
|
Actual := First_Actual (N);
|
|
Formal := First_Formal (Ent);
|
|
|
|
Set_Assignment_OK (Actual);
|
|
while Present (Actual) loop
|
|
if Is_By_Copy_Type (Etype (Actual))
|
|
and then Ekind (Formal) /= E_In_Parameter
|
|
then
|
|
N_Node :=
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Copy (Actual),
|
|
Expression =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Occurrence_Of (P, Loc),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Chars (Formal)))));
|
|
|
|
-- In all cases (including limited private types) we want
|
|
-- the assignment to be valid.
|
|
|
|
Set_Assignment_OK (Name (N_Node));
|
|
|
|
-- If the call is the triggering alternative in an
|
|
-- asynchronous select, or the entry_call alternative of a
|
|
-- conditional entry call, the assignments for in-out
|
|
-- parameters are incorporated into the statement list that
|
|
-- follows, so that there are executed only if the entry
|
|
-- call succeeds.
|
|
|
|
if (Nkind (Parent (N)) = N_Triggering_Alternative
|
|
and then N = Triggering_Statement (Parent (N)))
|
|
or else
|
|
(Nkind (Parent (N)) = N_Entry_Call_Alternative
|
|
and then N = Entry_Call_Statement (Parent (N)))
|
|
then
|
|
if No (Statements (Parent (N))) then
|
|
Set_Statements (Parent (N), New_List);
|
|
end if;
|
|
|
|
Prepend (N_Node, Statements (Parent (N)));
|
|
|
|
else
|
|
Insert_After (Call, N_Node);
|
|
end if;
|
|
end if;
|
|
|
|
Next_Actual (Actual);
|
|
Next_Formal_With_Extras (Formal);
|
|
end loop;
|
|
end if;
|
|
|
|
-- Finally, create block and analyze it
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Stats)));
|
|
|
|
Analyze (N);
|
|
end;
|
|
end Build_Simple_Entry_Call;
|
|
|
|
--------------------------------
|
|
-- Build_Task_Activation_Call --
|
|
--------------------------------
|
|
|
|
procedure Build_Task_Activation_Call (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Chain : Entity_Id;
|
|
Call : Node_Id;
|
|
Name : Node_Id;
|
|
P : Node_Id;
|
|
|
|
begin
|
|
-- For sequential elaboration policy, all the tasks will be activated at
|
|
-- the end of the elaboration.
|
|
|
|
if Partition_Elaboration_Policy = 'S' then
|
|
return;
|
|
end if;
|
|
|
|
-- Get the activation chain entity. Except in the case of a package
|
|
-- body, this is in the node that was passed. For a package body, we
|
|
-- have to find the corresponding package declaration node.
|
|
|
|
if Nkind (N) = N_Package_Body then
|
|
P := Corresponding_Spec (N);
|
|
loop
|
|
P := Parent (P);
|
|
exit when Nkind (P) = N_Package_Declaration;
|
|
end loop;
|
|
|
|
Chain := Activation_Chain_Entity (P);
|
|
|
|
else
|
|
Chain := Activation_Chain_Entity (N);
|
|
end if;
|
|
|
|
if Present (Chain) then
|
|
if Restricted_Profile then
|
|
Name := New_Occurrence_Of
|
|
(RTE (RE_Activate_Restricted_Tasks), Loc);
|
|
else
|
|
Name := New_Occurrence_Of
|
|
(RTE (RE_Activate_Tasks), Loc);
|
|
end if;
|
|
|
|
Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Name,
|
|
Parameter_Associations =>
|
|
New_List (Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Chain, Loc),
|
|
Attribute_Name => Name_Unchecked_Access)));
|
|
|
|
if Nkind (N) = N_Package_Declaration then
|
|
if Present (Corresponding_Body (N)) then
|
|
null;
|
|
|
|
elsif Present (Private_Declarations (Specification (N))) then
|
|
Append (Call, Private_Declarations (Specification (N)));
|
|
|
|
else
|
|
Append (Call, Visible_Declarations (Specification (N)));
|
|
end if;
|
|
|
|
else
|
|
if Present (Handled_Statement_Sequence (N)) then
|
|
|
|
-- The call goes at the start of the statement sequence after
|
|
-- the start of exception range label if one is present.
|
|
|
|
declare
|
|
Stm : Node_Id;
|
|
|
|
begin
|
|
Stm := First (Statements (Handled_Statement_Sequence (N)));
|
|
|
|
-- A special case, skip exception range label if one is
|
|
-- present (from front end zcx processing).
|
|
|
|
if Nkind (Stm) = N_Label and then Exception_Junk (Stm) then
|
|
Next (Stm);
|
|
end if;
|
|
|
|
-- Another special case, if the first statement is a block
|
|
-- from optimization of a local raise to a goto, then the
|
|
-- call goes inside this block.
|
|
|
|
if Nkind (Stm) = N_Block_Statement
|
|
and then Exception_Junk (Stm)
|
|
then
|
|
Stm :=
|
|
First (Statements (Handled_Statement_Sequence (Stm)));
|
|
end if;
|
|
|
|
-- Insertion point is after any exception label pushes,
|
|
-- since we want it covered by any local handlers.
|
|
|
|
while Nkind (Stm) in N_Push_xxx_Label loop
|
|
Next (Stm);
|
|
end loop;
|
|
|
|
-- Now we have the proper insertion point
|
|
|
|
Insert_Before (Stm, Call);
|
|
end;
|
|
|
|
else
|
|
Set_Handled_Statement_Sequence (N,
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Call)));
|
|
end if;
|
|
end if;
|
|
|
|
Analyze (Call);
|
|
Check_Task_Activation (N);
|
|
end if;
|
|
end Build_Task_Activation_Call;
|
|
|
|
-------------------------------
|
|
-- Build_Task_Allocate_Block --
|
|
-------------------------------
|
|
|
|
procedure Build_Task_Allocate_Block
|
|
(Actions : List_Id;
|
|
N : Node_Id;
|
|
Args : List_Id)
|
|
is
|
|
T : constant Entity_Id := Entity (Expression (N));
|
|
Init : constant Entity_Id := Base_Init_Proc (T);
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Chain : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, Name_uChain);
|
|
Blkent : constant Entity_Id := Make_Temporary (Loc, 'A');
|
|
Block : Node_Id;
|
|
|
|
begin
|
|
Block :=
|
|
Make_Block_Statement (Loc,
|
|
Identifier => New_Occurrence_Of (Blkent, Loc),
|
|
Declarations => New_List (
|
|
|
|
-- _Chain : Activation_Chain;
|
|
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Chain,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Activation_Chain), Loc))),
|
|
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
|
|
Statements => New_List (
|
|
|
|
-- Init (Args);
|
|
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (Init, Loc),
|
|
Parameter_Associations => Args),
|
|
|
|
-- Activate_Tasks (_Chain);
|
|
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Activate_Tasks), Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Chain, Loc),
|
|
Attribute_Name => Name_Unchecked_Access))))),
|
|
|
|
Has_Created_Identifier => True,
|
|
Is_Task_Allocation_Block => True);
|
|
|
|
Append_To (Actions,
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Blkent,
|
|
Label_Construct => Block));
|
|
|
|
Append_To (Actions, Block);
|
|
|
|
Set_Activation_Chain_Entity (Block, Chain);
|
|
end Build_Task_Allocate_Block;
|
|
|
|
-----------------------------------------------
|
|
-- Build_Task_Allocate_Block_With_Init_Stmts --
|
|
-----------------------------------------------
|
|
|
|
procedure Build_Task_Allocate_Block_With_Init_Stmts
|
|
(Actions : List_Id;
|
|
N : Node_Id;
|
|
Init_Stmts : List_Id)
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Chain : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, Name_uChain);
|
|
Blkent : constant Entity_Id := Make_Temporary (Loc, 'A');
|
|
Block : Node_Id;
|
|
|
|
begin
|
|
Append_To (Init_Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Activate_Tasks), Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Chain, Loc),
|
|
Attribute_Name => Name_Unchecked_Access))));
|
|
|
|
Block :=
|
|
Make_Block_Statement (Loc,
|
|
Identifier => New_Occurrence_Of (Blkent, Loc),
|
|
Declarations => New_List (
|
|
|
|
-- _Chain : Activation_Chain;
|
|
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Chain,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Activation_Chain), Loc))),
|
|
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Init_Stmts),
|
|
|
|
Has_Created_Identifier => True,
|
|
Is_Task_Allocation_Block => True);
|
|
|
|
Append_To (Actions,
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Blkent,
|
|
Label_Construct => Block));
|
|
|
|
Append_To (Actions, Block);
|
|
|
|
Set_Activation_Chain_Entity (Block, Chain);
|
|
end Build_Task_Allocate_Block_With_Init_Stmts;
|
|
|
|
-----------------------------------
|
|
-- Build_Task_Proc_Specification --
|
|
-----------------------------------
|
|
|
|
function Build_Task_Proc_Specification (T : Entity_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (T);
|
|
Spec_Id : Entity_Id;
|
|
|
|
begin
|
|
-- Case of explicit task type, suffix TB
|
|
|
|
if Comes_From_Source (T) then
|
|
Spec_Id :=
|
|
Make_Defining_Identifier (Loc, New_External_Name (Chars (T), "TB"));
|
|
|
|
-- Case of anonymous task type, suffix B
|
|
|
|
else
|
|
Spec_Id :=
|
|
Make_Defining_Identifier (Loc, New_External_Name (Chars (T), 'B'));
|
|
end if;
|
|
|
|
Set_Is_Internal (Spec_Id);
|
|
|
|
-- Associate the procedure with the task, if this is the declaration
|
|
-- (and not the body) of the procedure.
|
|
|
|
if No (Task_Body_Procedure (T)) then
|
|
Set_Task_Body_Procedure (T, Spec_Id);
|
|
end if;
|
|
|
|
return
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name => Spec_Id,
|
|
Parameter_Specifications => New_List (
|
|
Make_Parameter_Specification (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uTask),
|
|
Parameter_Type =>
|
|
Make_Access_Definition (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Corresponding_Record_Type (T), Loc)))));
|
|
end Build_Task_Proc_Specification;
|
|
|
|
---------------------------------------
|
|
-- Build_Unprotected_Subprogram_Body --
|
|
---------------------------------------
|
|
|
|
function Build_Unprotected_Subprogram_Body
|
|
(N : Node_Id;
|
|
Pid : Node_Id) return Node_Id
|
|
is
|
|
Decls : constant List_Id := Declarations (N);
|
|
|
|
begin
|
|
-- Add renamings for the Protection object, discriminals, privals, and
|
|
-- the entry index constant for use by debugger.
|
|
|
|
Debug_Private_Data_Declarations (Decls);
|
|
|
|
-- Make an unprotected version of the subprogram for use within the same
|
|
-- object, with a new name and an additional parameter representing the
|
|
-- object.
|
|
|
|
return
|
|
Make_Subprogram_Body (Sloc (N),
|
|
Specification =>
|
|
Build_Protected_Sub_Specification (N, Pid, Unprotected_Mode),
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence => Handled_Statement_Sequence (N));
|
|
end Build_Unprotected_Subprogram_Body;
|
|
|
|
----------------------------
|
|
-- Collect_Entry_Families --
|
|
----------------------------
|
|
|
|
procedure Collect_Entry_Families
|
|
(Loc : Source_Ptr;
|
|
Cdecls : List_Id;
|
|
Current_Node : in out Node_Id;
|
|
Conctyp : Entity_Id)
|
|
is
|
|
Efam : Entity_Id;
|
|
Efam_Decl : Node_Id;
|
|
Efam_Type : Entity_Id;
|
|
|
|
begin
|
|
Efam := First_Entity (Conctyp);
|
|
while Present (Efam) loop
|
|
if Ekind (Efam) = E_Entry_Family then
|
|
Efam_Type := Make_Temporary (Loc, 'F');
|
|
|
|
declare
|
|
Bas : Entity_Id :=
|
|
Base_Type
|
|
(Etype (Discrete_Subtype_Definition (Parent (Efam))));
|
|
|
|
Bas_Decl : Node_Id := Empty;
|
|
Lo, Hi : Node_Id;
|
|
|
|
begin
|
|
Get_Index_Bounds
|
|
(Discrete_Subtype_Definition (Parent (Efam)), Lo, Hi);
|
|
|
|
if Is_Potentially_Large_Family (Bas, Conctyp, Lo, Hi) then
|
|
Bas := Make_Temporary (Loc, 'B');
|
|
|
|
Bas_Decl :=
|
|
Make_Subtype_Declaration (Loc,
|
|
Defining_Identifier => Bas,
|
|
Subtype_Indication =>
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Standard_Integer, Loc),
|
|
Constraint =>
|
|
Make_Range_Constraint (Loc,
|
|
Range_Expression => Make_Range (Loc,
|
|
Make_Integer_Literal
|
|
(Loc, -Entry_Family_Bound),
|
|
Make_Integer_Literal
|
|
(Loc, Entry_Family_Bound - 1)))));
|
|
|
|
Insert_After (Current_Node, Bas_Decl);
|
|
Current_Node := Bas_Decl;
|
|
Analyze (Bas_Decl);
|
|
end if;
|
|
|
|
Efam_Decl :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Efam_Type,
|
|
Type_Definition =>
|
|
Make_Unconstrained_Array_Definition (Loc,
|
|
Subtype_Marks =>
|
|
(New_List (New_Occurrence_Of (Bas, Loc))),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (Standard_Character, Loc))));
|
|
end;
|
|
|
|
Insert_After (Current_Node, Efam_Decl);
|
|
Current_Node := Efam_Decl;
|
|
Analyze (Efam_Decl);
|
|
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Chars (Efam)),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Efam_Type, Loc),
|
|
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints => New_List (
|
|
New_Occurrence_Of
|
|
(Etype (Discrete_Subtype_Definition
|
|
(Parent (Efam))), Loc)))))));
|
|
|
|
end if;
|
|
|
|
Next_Entity (Efam);
|
|
end loop;
|
|
end Collect_Entry_Families;
|
|
|
|
-----------------------
|
|
-- Concurrent_Object --
|
|
-----------------------
|
|
|
|
function Concurrent_Object
|
|
(Spec_Id : Entity_Id;
|
|
Conc_Typ : Entity_Id) return Entity_Id
|
|
is
|
|
begin
|
|
-- Parameter _O or _object
|
|
|
|
if Is_Protected_Type (Conc_Typ) then
|
|
return First_Formal (Protected_Body_Subprogram (Spec_Id));
|
|
|
|
-- Parameter _task
|
|
|
|
else
|
|
pragma Assert (Is_Task_Type (Conc_Typ));
|
|
return First_Formal (Task_Body_Procedure (Conc_Typ));
|
|
end if;
|
|
end Concurrent_Object;
|
|
|
|
----------------------
|
|
-- Copy_Result_Type --
|
|
----------------------
|
|
|
|
function Copy_Result_Type (Res : Node_Id) return Node_Id is
|
|
New_Res : constant Node_Id := New_Copy_Tree (Res);
|
|
Par_Spec : Node_Id;
|
|
Formal : Entity_Id;
|
|
|
|
begin
|
|
-- If the result type is an access_to_subprogram, we must create new
|
|
-- entities for its spec.
|
|
|
|
if Nkind (New_Res) = N_Access_Definition
|
|
and then Present (Access_To_Subprogram_Definition (New_Res))
|
|
then
|
|
-- Provide new entities for the formals
|
|
|
|
Par_Spec := First (Parameter_Specifications
|
|
(Access_To_Subprogram_Definition (New_Res)));
|
|
while Present (Par_Spec) loop
|
|
Formal := Defining_Identifier (Par_Spec);
|
|
Set_Defining_Identifier (Par_Spec,
|
|
Make_Defining_Identifier (Sloc (Formal), Chars (Formal)));
|
|
Next (Par_Spec);
|
|
end loop;
|
|
end if;
|
|
|
|
return New_Res;
|
|
end Copy_Result_Type;
|
|
|
|
--------------------
|
|
-- Concurrent_Ref --
|
|
--------------------
|
|
|
|
-- The expression returned for a reference to a concurrent object has the
|
|
-- form:
|
|
|
|
-- taskV!(name)._Task_Id
|
|
|
|
-- for a task, and
|
|
|
|
-- objectV!(name)._Object
|
|
|
|
-- for a protected object. For the case of an access to a concurrent
|
|
-- object, there is an extra explicit dereference:
|
|
|
|
-- taskV!(name.all)._Task_Id
|
|
-- objectV!(name.all)._Object
|
|
|
|
-- here taskV and objectV are the types for the associated records, which
|
|
-- contain the required _Task_Id and _Object fields for tasks and protected
|
|
-- objects, respectively.
|
|
|
|
-- For the case of a task type name, the expression is
|
|
|
|
-- Self;
|
|
|
|
-- i.e. a call to the Self function which returns precisely this Task_Id
|
|
|
|
-- For the case of a protected type name, the expression is
|
|
|
|
-- objectR
|
|
|
|
-- which is a renaming of the _object field of the current object
|
|
-- record, passed into protected operations as a parameter.
|
|
|
|
function Concurrent_Ref (N : Node_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Ntyp : constant Entity_Id := Etype (N);
|
|
Dtyp : Entity_Id;
|
|
Sel : Name_Id;
|
|
|
|
function Is_Current_Task (T : Entity_Id) return Boolean;
|
|
-- Check whether the reference is to the immediately enclosing task
|
|
-- type, or to an outer one (rare but legal).
|
|
|
|
---------------------
|
|
-- Is_Current_Task --
|
|
---------------------
|
|
|
|
function Is_Current_Task (T : Entity_Id) return Boolean is
|
|
Scop : Entity_Id;
|
|
|
|
begin
|
|
Scop := Current_Scope;
|
|
while Present (Scop) and then Scop /= Standard_Standard loop
|
|
if Scop = T then
|
|
return True;
|
|
|
|
elsif Is_Task_Type (Scop) then
|
|
return False;
|
|
|
|
-- If this is a procedure nested within the task type, we must
|
|
-- assume that it can be called from an inner task, and therefore
|
|
-- cannot treat it as a local reference.
|
|
|
|
elsif Is_Overloadable (Scop) and then In_Open_Scopes (T) then
|
|
return False;
|
|
|
|
else
|
|
Scop := Scope (Scop);
|
|
end if;
|
|
end loop;
|
|
|
|
-- We know that we are within the task body, so should have found it
|
|
-- in scope.
|
|
|
|
raise Program_Error;
|
|
end Is_Current_Task;
|
|
|
|
-- Start of processing for Concurrent_Ref
|
|
|
|
begin
|
|
if Is_Access_Type (Ntyp) then
|
|
Dtyp := Designated_Type (Ntyp);
|
|
|
|
if Is_Protected_Type (Dtyp) then
|
|
Sel := Name_uObject;
|
|
else
|
|
Sel := Name_uTask_Id;
|
|
end if;
|
|
|
|
return
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (Corresponding_Record_Type (Dtyp),
|
|
Make_Explicit_Dereference (Loc, N)),
|
|
Selector_Name => Make_Identifier (Loc, Sel));
|
|
|
|
elsif Is_Entity_Name (N) and then Is_Concurrent_Type (Entity (N)) then
|
|
if Is_Task_Type (Entity (N)) then
|
|
|
|
if Is_Current_Task (Entity (N)) then
|
|
return
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Self), Loc));
|
|
|
|
else
|
|
declare
|
|
Decl : Node_Id;
|
|
T_Self : constant Entity_Id := Make_Temporary (Loc, 'T');
|
|
T_Body : constant Node_Id :=
|
|
Parent (Corresponding_Body (Parent (Entity (N))));
|
|
|
|
begin
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => T_Self,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RO_ST_Task_Id), Loc),
|
|
Expression =>
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Self), Loc)));
|
|
Prepend (Decl, Declarations (T_Body));
|
|
Analyze (Decl);
|
|
Set_Scope (T_Self, Entity (N));
|
|
return New_Occurrence_Of (T_Self, Loc);
|
|
end;
|
|
end if;
|
|
|
|
else
|
|
pragma Assert (Is_Protected_Type (Entity (N)));
|
|
|
|
return
|
|
New_Occurrence_Of (Find_Protection_Object (Current_Scope), Loc);
|
|
end if;
|
|
|
|
else
|
|
if Is_Protected_Type (Ntyp) then
|
|
Sel := Name_uObject;
|
|
elsif Is_Task_Type (Ntyp) then
|
|
Sel := Name_uTask_Id;
|
|
else
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
return
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (Corresponding_Record_Type (Ntyp),
|
|
New_Copy_Tree (N)),
|
|
Selector_Name => Make_Identifier (Loc, Sel));
|
|
end if;
|
|
end Concurrent_Ref;
|
|
|
|
------------------------
|
|
-- Convert_Concurrent --
|
|
------------------------
|
|
|
|
function Convert_Concurrent
|
|
(N : Node_Id;
|
|
Typ : Entity_Id) return Node_Id
|
|
is
|
|
begin
|
|
if not Is_Concurrent_Type (Typ) then
|
|
return N;
|
|
else
|
|
return
|
|
Unchecked_Convert_To
|
|
(Corresponding_Record_Type (Typ), New_Copy_Tree (N));
|
|
end if;
|
|
end Convert_Concurrent;
|
|
|
|
-------------------------------------
|
|
-- Debug_Private_Data_Declarations --
|
|
-------------------------------------
|
|
|
|
procedure Debug_Private_Data_Declarations (Decls : List_Id) is
|
|
Debug_Nod : Node_Id;
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
Decl := First (Decls);
|
|
while Present (Decl) and then not Comes_From_Source (Decl) loop
|
|
|
|
-- Declaration for concurrent entity _object and its access type,
|
|
-- along with the entry index subtype:
|
|
-- type prot_typVP is access prot_typV;
|
|
-- _object : prot_typVP := prot_typV (_O);
|
|
-- subtype Jnn is <Type of Index> range Low .. High;
|
|
|
|
if Nkind_In (Decl, N_Full_Type_Declaration, N_Object_Declaration) then
|
|
Set_Debug_Info_Needed (Defining_Identifier (Decl));
|
|
|
|
-- Declaration for the Protection object, discriminals, privals, and
|
|
-- entry index constant:
|
|
-- conc_typR : protection_typ renames _object._object;
|
|
-- discr_nameD : discr_typ renames _object.discr_name;
|
|
-- discr_nameD : discr_typ renames _task.discr_name;
|
|
-- prival_name : comp_typ renames _object.comp_name;
|
|
-- J : constant Jnn :=
|
|
-- Jnn'Val (_E - <Index expression> + Jnn'Pos (Jnn'First));
|
|
|
|
elsif Nkind (Decl) = N_Object_Renaming_Declaration then
|
|
Set_Debug_Info_Needed (Defining_Identifier (Decl));
|
|
Debug_Nod := Debug_Renaming_Declaration (Decl);
|
|
|
|
if Present (Debug_Nod) then
|
|
Insert_After (Decl, Debug_Nod);
|
|
end if;
|
|
end if;
|
|
|
|
Next (Decl);
|
|
end loop;
|
|
end Debug_Private_Data_Declarations;
|
|
|
|
------------------------------
|
|
-- Ensure_Statement_Present --
|
|
------------------------------
|
|
|
|
procedure Ensure_Statement_Present (Loc : Source_Ptr; Alt : Node_Id) is
|
|
Stmt : Node_Id;
|
|
|
|
begin
|
|
if Opt.Suppress_Control_Flow_Optimizations
|
|
and then Is_Empty_List (Statements (Alt))
|
|
then
|
|
Stmt := Make_Null_Statement (Loc);
|
|
|
|
-- Mark NULL statement as coming from source so that it is not
|
|
-- eliminated by GIGI.
|
|
|
|
-- Another covert channel. If this is a requirement, it must be
|
|
-- documented in sinfo/einfo ???
|
|
|
|
Set_Comes_From_Source (Stmt, True);
|
|
|
|
Set_Statements (Alt, New_List (Stmt));
|
|
end if;
|
|
end Ensure_Statement_Present;
|
|
|
|
----------------------------
|
|
-- Entry_Index_Expression --
|
|
----------------------------
|
|
|
|
function Entry_Index_Expression
|
|
(Sloc : Source_Ptr;
|
|
Ent : Entity_Id;
|
|
Index : Node_Id;
|
|
Ttyp : Entity_Id) return Node_Id
|
|
is
|
|
Expr : Node_Id;
|
|
Num : Node_Id;
|
|
Lo : Node_Id;
|
|
Hi : Node_Id;
|
|
Prev : Entity_Id;
|
|
S : Node_Id;
|
|
|
|
begin
|
|
-- The queues of entries and entry families appear in textual order in
|
|
-- the associated record. The entry index is computed as the sum of the
|
|
-- number of queues for all entries that precede the designated one, to
|
|
-- which is added the index expression, if this expression denotes a
|
|
-- member of a family.
|
|
|
|
-- The following is a place holder for the count of simple entries
|
|
|
|
Num := Make_Integer_Literal (Sloc, 1);
|
|
|
|
-- We construct an expression which is a series of addition operations.
|
|
-- The first operand is the number of single entries that precede this
|
|
-- one, the second operand is the index value relative to the start of
|
|
-- the referenced family, and the remaining operands are the lengths of
|
|
-- the entry families that precede this entry, i.e. the constructed
|
|
-- expression is:
|
|
|
|
-- number_simple_entries +
|
|
-- (s'pos (index-value) - s'pos (family'first)) + 1 +
|
|
-- family'length + ...
|
|
|
|
-- where index-value is the given index value, and s is the index
|
|
-- subtype (we have to use pos because the subtype might be an
|
|
-- enumeration type preventing direct subtraction). Note that the task
|
|
-- entry array is one-indexed.
|
|
|
|
-- The upper bound of the entry family may be a discriminant, so we
|
|
-- retrieve the lower bound explicitly to compute offset, rather than
|
|
-- using the index subtype which may mention a discriminant.
|
|
|
|
if Present (Index) then
|
|
S := Etype (Discrete_Subtype_Definition (Declaration_Node (Ent)));
|
|
|
|
Expr :=
|
|
Make_Op_Add (Sloc,
|
|
Left_Opnd => Num,
|
|
Right_Opnd =>
|
|
Family_Offset
|
|
(Sloc,
|
|
Make_Attribute_Reference (Sloc,
|
|
Attribute_Name => Name_Pos,
|
|
Prefix => New_Occurrence_Of (Base_Type (S), Sloc),
|
|
Expressions => New_List (Relocate_Node (Index))),
|
|
Type_Low_Bound (S),
|
|
Ttyp,
|
|
False));
|
|
else
|
|
Expr := Num;
|
|
end if;
|
|
|
|
-- Now add lengths of preceding entries and entry families
|
|
|
|
Prev := First_Entity (Ttyp);
|
|
while Chars (Prev) /= Chars (Ent)
|
|
or else (Ekind (Prev) /= Ekind (Ent))
|
|
or else not Sem_Ch6.Type_Conformant (Ent, Prev)
|
|
loop
|
|
if Ekind (Prev) = E_Entry then
|
|
Set_Intval (Num, Intval (Num) + 1);
|
|
|
|
elsif Ekind (Prev) = E_Entry_Family then
|
|
S := Etype (Discrete_Subtype_Definition (Declaration_Node (Prev)));
|
|
Lo := Type_Low_Bound (S);
|
|
Hi := Type_High_Bound (S);
|
|
|
|
Expr :=
|
|
Make_Op_Add (Sloc,
|
|
Left_Opnd => Expr,
|
|
Right_Opnd => Family_Size (Sloc, Hi, Lo, Ttyp, False));
|
|
|
|
-- Other components are anonymous types to be ignored
|
|
|
|
else
|
|
null;
|
|
end if;
|
|
|
|
Next_Entity (Prev);
|
|
end loop;
|
|
|
|
return Expr;
|
|
end Entry_Index_Expression;
|
|
|
|
---------------------------
|
|
-- Establish_Task_Master --
|
|
---------------------------
|
|
|
|
procedure Establish_Task_Master (N : Node_Id) is
|
|
Call : Node_Id;
|
|
|
|
begin
|
|
if Restriction_Active (No_Task_Hierarchy) = False then
|
|
Call := Build_Runtime_Call (Sloc (N), RE_Enter_Master);
|
|
|
|
-- The block may have no declarations (and nevertheless be a task
|
|
-- master) if it contains a call that may return an object that
|
|
-- contains tasks.
|
|
|
|
if No (Declarations (N)) then
|
|
Set_Declarations (N, New_List (Call));
|
|
else
|
|
Prepend_To (Declarations (N), Call);
|
|
end if;
|
|
|
|
Analyze (Call);
|
|
end if;
|
|
end Establish_Task_Master;
|
|
|
|
--------------------------------
|
|
-- Expand_Accept_Declarations --
|
|
--------------------------------
|
|
|
|
-- Part of the expansion of an accept statement involves the creation of
|
|
-- a declaration that can be referenced from the statement sequence of
|
|
-- the accept:
|
|
|
|
-- Ann : Address;
|
|
|
|
-- This declaration is inserted immediately before the accept statement
|
|
-- and it is important that it be inserted before the statements of the
|
|
-- statement sequence are analyzed. Thus it would be too late to create
|
|
-- this declaration in the Expand_N_Accept_Statement routine, which is
|
|
-- why there is a separate procedure to be called directly from Sem_Ch9.
|
|
|
|
-- Ann is used to hold the address of the record containing the parameters
|
|
-- (see Expand_N_Entry_Call for more details on how this record is built).
|
|
-- References to the parameters do an unchecked conversion of this address
|
|
-- to a pointer to the required record type, and then access the field that
|
|
-- holds the value of the required parameter. The entity for the address
|
|
-- variable is held as the top stack element (i.e. the last element) of the
|
|
-- Accept_Address stack in the corresponding entry entity, and this element
|
|
-- must be set in place before the statements are processed.
|
|
|
|
-- The above description applies to the case of a stand alone accept
|
|
-- statement, i.e. one not appearing as part of a select alternative.
|
|
|
|
-- For the case of an accept that appears as part of a select alternative
|
|
-- of a selective accept, we must still create the declaration right away,
|
|
-- since Ann is needed immediately, but there is an important difference:
|
|
|
|
-- The declaration is inserted before the selective accept, not before
|
|
-- the accept statement (which is not part of a list anyway, and so would
|
|
-- not accommodate inserted declarations)
|
|
|
|
-- We only need one address variable for the entire selective accept. So
|
|
-- the Ann declaration is created only for the first accept alternative,
|
|
-- and subsequent accept alternatives reference the same Ann variable.
|
|
|
|
-- We can distinguish the two cases by seeing whether the accept statement
|
|
-- is part of a list. If not, then it must be in an accept alternative.
|
|
|
|
-- To expand the requeue statement, a label is provided at the end of the
|
|
-- accept statement or alternative of which it is a part, so that the
|
|
-- statement can be skipped after the requeue is complete. This label is
|
|
-- created here rather than during the expansion of the accept statement,
|
|
-- because it will be needed by any requeue statements within the accept,
|
|
-- which are expanded before the accept.
|
|
|
|
procedure Expand_Accept_Declarations (N : Node_Id; Ent : Entity_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Stats : constant Node_Id := Handled_Statement_Sequence (N);
|
|
Ann : Entity_Id := Empty;
|
|
Adecl : Node_Id;
|
|
Lab : Node_Id;
|
|
Ldecl : Node_Id;
|
|
Ldecl2 : Node_Id;
|
|
|
|
begin
|
|
if Expander_Active then
|
|
|
|
-- If we have no handled statement sequence, we may need to build
|
|
-- a dummy sequence consisting of a null statement. This can be
|
|
-- skipped if the trivial accept optimization is permitted.
|
|
|
|
if not Trivial_Accept_OK
|
|
and then (No (Stats) or else Null_Statements (Statements (Stats)))
|
|
then
|
|
Set_Handled_Statement_Sequence (N,
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (Make_Null_Statement (Loc))));
|
|
end if;
|
|
|
|
-- Create and declare two labels to be placed at the end of the
|
|
-- accept statement. The first label is used to allow requeues to
|
|
-- skip the remainder of entry processing. The second label is used
|
|
-- to skip the remainder of entry processing if the rendezvous
|
|
-- completes in the middle of the accept body.
|
|
|
|
if Present (Handled_Statement_Sequence (N)) then
|
|
declare
|
|
Ent : Entity_Id;
|
|
|
|
begin
|
|
Ent := Make_Temporary (Loc, 'L');
|
|
Lab := Make_Label (Loc, New_Occurrence_Of (Ent, Loc));
|
|
Ldecl :=
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Ent,
|
|
Label_Construct => Lab);
|
|
Append (Lab, Statements (Handled_Statement_Sequence (N)));
|
|
|
|
Ent := Make_Temporary (Loc, 'L');
|
|
Lab := Make_Label (Loc, New_Occurrence_Of (Ent, Loc));
|
|
Ldecl2 :=
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Ent,
|
|
Label_Construct => Lab);
|
|
Append (Lab, Statements (Handled_Statement_Sequence (N)));
|
|
end;
|
|
|
|
else
|
|
Ldecl := Empty;
|
|
Ldecl2 := Empty;
|
|
end if;
|
|
|
|
-- Case of stand alone accept statement
|
|
|
|
if Is_List_Member (N) then
|
|
|
|
if Present (Handled_Statement_Sequence (N)) then
|
|
Ann := Make_Temporary (Loc, 'A');
|
|
|
|
Adecl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Ann,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc));
|
|
|
|
Insert_Before_And_Analyze (N, Adecl);
|
|
Insert_Before_And_Analyze (N, Ldecl);
|
|
Insert_Before_And_Analyze (N, Ldecl2);
|
|
end if;
|
|
|
|
-- Case of accept statement which is in an accept alternative
|
|
|
|
else
|
|
declare
|
|
Acc_Alt : constant Node_Id := Parent (N);
|
|
Sel_Acc : constant Node_Id := Parent (Acc_Alt);
|
|
Alt : Node_Id;
|
|
|
|
begin
|
|
pragma Assert (Nkind (Acc_Alt) = N_Accept_Alternative);
|
|
pragma Assert (Nkind (Sel_Acc) = N_Selective_Accept);
|
|
|
|
-- ??? Consider a single label for select statements
|
|
|
|
if Present (Handled_Statement_Sequence (N)) then
|
|
Prepend (Ldecl2,
|
|
Statements (Handled_Statement_Sequence (N)));
|
|
Analyze (Ldecl2);
|
|
|
|
Prepend (Ldecl,
|
|
Statements (Handled_Statement_Sequence (N)));
|
|
Analyze (Ldecl);
|
|
end if;
|
|
|
|
-- Find first accept alternative of the selective accept. A
|
|
-- valid selective accept must have at least one accept in it.
|
|
|
|
Alt := First (Select_Alternatives (Sel_Acc));
|
|
|
|
while Nkind (Alt) /= N_Accept_Alternative loop
|
|
Next (Alt);
|
|
end loop;
|
|
|
|
-- If this is the first accept statement, then we have to
|
|
-- create the Ann variable, as for the stand alone case, except
|
|
-- that it is inserted before the selective accept. Similarly,
|
|
-- a label for requeue expansion must be declared.
|
|
|
|
if N = Accept_Statement (Alt) then
|
|
Ann := Make_Temporary (Loc, 'A');
|
|
Adecl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Ann,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc));
|
|
|
|
Insert_Before_And_Analyze (Sel_Acc, Adecl);
|
|
|
|
-- If this is not the first accept statement, then find the Ann
|
|
-- variable allocated by the first accept and use it.
|
|
|
|
else
|
|
Ann :=
|
|
Node (Last_Elmt (Accept_Address
|
|
(Entity (Entry_Direct_Name (Accept_Statement (Alt))))));
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
-- Merge here with Ann either created or referenced, and Adecl
|
|
-- pointing to the corresponding declaration. Remaining processing
|
|
-- is the same for the two cases.
|
|
|
|
if Present (Ann) then
|
|
Append_Elmt (Ann, Accept_Address (Ent));
|
|
Set_Debug_Info_Needed (Ann);
|
|
end if;
|
|
|
|
-- Create renaming declarations for the entry formals. Each reference
|
|
-- to a formal becomes a dereference of a component of the parameter
|
|
-- block, whose address is held in Ann. These declarations are
|
|
-- eventually inserted into the accept block, and analyzed there so
|
|
-- that they have the proper scope for gdb and do not conflict with
|
|
-- other declarations.
|
|
|
|
if Present (Parameter_Specifications (N))
|
|
and then Present (Handled_Statement_Sequence (N))
|
|
then
|
|
declare
|
|
Comp : Entity_Id;
|
|
Decl : Node_Id;
|
|
Formal : Entity_Id;
|
|
New_F : Entity_Id;
|
|
Renamed_Formal : Node_Id;
|
|
|
|
begin
|
|
Push_Scope (Ent);
|
|
Formal := First_Formal (Ent);
|
|
|
|
while Present (Formal) loop
|
|
Comp := Entry_Component (Formal);
|
|
New_F := Make_Defining_Identifier (Loc, Chars (Formal));
|
|
|
|
Set_Etype (New_F, Etype (Formal));
|
|
Set_Scope (New_F, Ent);
|
|
|
|
-- Now we set debug info needed on New_F even though it does
|
|
-- not come from source, so that the debugger will get the
|
|
-- right information for these generated names.
|
|
|
|
Set_Debug_Info_Needed (New_F);
|
|
|
|
if Ekind (Formal) = E_In_Parameter then
|
|
Set_Ekind (New_F, E_Constant);
|
|
else
|
|
Set_Ekind (New_F, E_Variable);
|
|
Set_Extra_Constrained (New_F, Extra_Constrained (Formal));
|
|
end if;
|
|
|
|
Set_Actual_Subtype (New_F, Actual_Subtype (Formal));
|
|
|
|
Renamed_Formal :=
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (
|
|
Entry_Parameters_Type (Ent),
|
|
New_Occurrence_Of (Ann, Loc)),
|
|
Selector_Name =>
|
|
New_Occurrence_Of (Comp, Loc));
|
|
|
|
Decl :=
|
|
Build_Renamed_Formal_Declaration
|
|
(New_F, Formal, Comp, Renamed_Formal);
|
|
|
|
if No (Declarations (N)) then
|
|
Set_Declarations (N, New_List);
|
|
end if;
|
|
|
|
Append (Decl, Declarations (N));
|
|
Set_Renamed_Object (Formal, New_F);
|
|
Next_Formal (Formal);
|
|
end loop;
|
|
|
|
End_Scope;
|
|
end;
|
|
end if;
|
|
end if;
|
|
end Expand_Accept_Declarations;
|
|
|
|
---------------------------------------------
|
|
-- Expand_Access_Protected_Subprogram_Type --
|
|
---------------------------------------------
|
|
|
|
procedure Expand_Access_Protected_Subprogram_Type (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
T : constant Entity_Id := Defining_Identifier (N);
|
|
D_T : constant Entity_Id := Designated_Type (T);
|
|
D_T2 : constant Entity_Id := Make_Temporary (Loc, 'D');
|
|
E_T : constant Entity_Id := Make_Temporary (Loc, 'E');
|
|
P_List : constant List_Id :=
|
|
Build_Protected_Spec (N, RTE (RE_Address), D_T, False);
|
|
|
|
Comps : List_Id;
|
|
Decl1 : Node_Id;
|
|
Decl2 : Node_Id;
|
|
Def1 : Node_Id;
|
|
|
|
begin
|
|
-- Create access to subprogram with full signature
|
|
|
|
if Etype (D_T) /= Standard_Void_Type then
|
|
Def1 :=
|
|
Make_Access_Function_Definition (Loc,
|
|
Parameter_Specifications => P_List,
|
|
Result_Definition =>
|
|
Copy_Result_Type (Result_Definition (Type_Definition (N))));
|
|
|
|
else
|
|
Def1 :=
|
|
Make_Access_Procedure_Definition (Loc,
|
|
Parameter_Specifications => P_List);
|
|
end if;
|
|
|
|
Decl1 :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => D_T2,
|
|
Type_Definition => Def1);
|
|
|
|
-- Declare the new types before the original one since the latter will
|
|
-- refer to them through the Equivalent_Type slot.
|
|
|
|
Insert_Before_And_Analyze (N, Decl1);
|
|
|
|
-- Associate the access to subprogram with its original access to
|
|
-- protected subprogram type. Needed by the backend to know that this
|
|
-- type corresponds with an access to protected subprogram type.
|
|
|
|
Set_Original_Access_Type (D_T2, T);
|
|
|
|
-- Create Equivalent_Type, a record with two components for an access to
|
|
-- object and an access to subprogram.
|
|
|
|
Comps := New_List (
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier => Make_Temporary (Loc, 'P'),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (RTE (RE_Address), Loc))),
|
|
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier => Make_Temporary (Loc, 'S'),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication => New_Occurrence_Of (D_T2, Loc))));
|
|
|
|
Decl2 :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => E_T,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Component_List =>
|
|
Make_Component_List (Loc, Component_Items => Comps)));
|
|
|
|
Insert_Before_And_Analyze (N, Decl2);
|
|
Set_Equivalent_Type (T, E_T);
|
|
end Expand_Access_Protected_Subprogram_Type;
|
|
|
|
--------------------------
|
|
-- Expand_Entry_Barrier --
|
|
--------------------------
|
|
|
|
procedure Expand_Entry_Barrier (N : Node_Id; Ent : Entity_Id) is
|
|
Cond : constant Node_Id :=
|
|
Condition (Entry_Body_Formal_Part (N));
|
|
Prot : constant Entity_Id := Scope (Ent);
|
|
Spec_Decl : constant Node_Id := Parent (Prot);
|
|
Func : Entity_Id := Empty;
|
|
B_F : Node_Id;
|
|
Body_Decl : Node_Id;
|
|
|
|
function Is_Global_Entity (N : Node_Id) return Traverse_Result;
|
|
-- Check whether entity in Barrier is external to protected type.
|
|
-- If so, barrier may not be properly synchronized.
|
|
|
|
function Is_Pure_Barrier (N : Node_Id) return Traverse_Result;
|
|
-- Check whether N follows the Pure_Barriers restriction. Return OK if
|
|
-- so.
|
|
|
|
function Is_Simple_Barrier_Name (N : Node_Id) return Boolean;
|
|
-- Check whether entity name N denotes a component of the protected
|
|
-- object. This is used to check the Simple_Barrier restriction.
|
|
|
|
----------------------
|
|
-- Is_Global_Entity --
|
|
----------------------
|
|
|
|
function Is_Global_Entity (N : Node_Id) return Traverse_Result is
|
|
E : Entity_Id;
|
|
S : Entity_Id;
|
|
|
|
begin
|
|
if Is_Entity_Name (N) and then Present (Entity (N)) then
|
|
E := Entity (N);
|
|
S := Scope (E);
|
|
|
|
if Ekind (E) = E_Variable then
|
|
|
|
-- If the variable is local to the barrier function generated
|
|
-- during expansion, it is ok. If expansion is not performed,
|
|
-- then Func is Empty so this test cannot succeed.
|
|
|
|
if Scope (E) = Func then
|
|
null;
|
|
|
|
-- A protected call from a barrier to another object is ok
|
|
|
|
elsif Ekind (Etype (E)) = E_Protected_Type then
|
|
null;
|
|
|
|
-- If the variable is within the package body we consider
|
|
-- this safe. This is a common (if dubious) idiom.
|
|
|
|
elsif S = Scope (Prot)
|
|
and then Ekind_In (S, E_Package, E_Generic_Package)
|
|
and then Nkind (Parent (E)) = N_Object_Declaration
|
|
and then Nkind (Parent (Parent (E))) = N_Package_Body
|
|
then
|
|
null;
|
|
|
|
else
|
|
Error_Msg_N ("potentially unsynchronized barrier??", N);
|
|
Error_Msg_N ("\& should be private component of type??", N);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
return OK;
|
|
end Is_Global_Entity;
|
|
|
|
procedure Check_Unprotected_Barrier is
|
|
new Traverse_Proc (Is_Global_Entity);
|
|
|
|
----------------------------
|
|
-- Is_Simple_Barrier_Name --
|
|
----------------------------
|
|
|
|
function Is_Simple_Barrier_Name (N : Node_Id) return Boolean is
|
|
Renamed : Node_Id;
|
|
|
|
begin
|
|
-- Check for case of _object.all.field (note that the explicit
|
|
-- dereference gets inserted by analyze/expand of _object.field).
|
|
|
|
if Expander_Active then
|
|
Renamed := Renamed_Object (Entity (N));
|
|
|
|
return
|
|
Present (Renamed)
|
|
and then Nkind (Renamed) = N_Selected_Component
|
|
and then Chars (Prefix (Prefix (Renamed))) = Name_uObject;
|
|
else
|
|
return Scope (Entity (N)) = Current_Scope;
|
|
end if;
|
|
end Is_Simple_Barrier_Name;
|
|
|
|
---------------------
|
|
-- Is_Pure_Barrier --
|
|
---------------------
|
|
|
|
function Is_Pure_Barrier (N : Node_Id) return Traverse_Result is
|
|
begin
|
|
case Nkind (N) is
|
|
when N_Expanded_Name |
|
|
N_Identifier =>
|
|
if No (Entity (N)) then
|
|
return Abandon;
|
|
end if;
|
|
|
|
case Ekind (Entity (N)) is
|
|
when E_Constant |
|
|
E_Discriminant |
|
|
E_Named_Integer |
|
|
E_Named_Real |
|
|
E_Enumeration_Literal =>
|
|
return OK;
|
|
|
|
when E_Component |
|
|
E_Variable =>
|
|
|
|
-- A variable in the protected type is expanded as a
|
|
-- component.
|
|
|
|
if Is_Simple_Barrier_Name (N) then
|
|
return OK;
|
|
end if;
|
|
|
|
when others =>
|
|
null;
|
|
end case;
|
|
|
|
when N_Integer_Literal |
|
|
N_Real_Literal |
|
|
N_Character_Literal =>
|
|
return OK;
|
|
|
|
when N_Op_Boolean |
|
|
N_Op_Not =>
|
|
if Ekind (Entity (N)) = E_Operator then
|
|
return OK;
|
|
end if;
|
|
|
|
when N_Short_Circuit =>
|
|
return OK;
|
|
|
|
when others =>
|
|
null;
|
|
end case;
|
|
|
|
return Abandon;
|
|
end Is_Pure_Barrier;
|
|
|
|
function Check_Pure_Barriers is new Traverse_Func (Is_Pure_Barrier);
|
|
|
|
-- Start of processing for Expand_Entry_Barrier
|
|
|
|
begin
|
|
if No_Run_Time_Mode then
|
|
Error_Msg_CRT ("entry barrier", N);
|
|
return;
|
|
end if;
|
|
|
|
-- The body of the entry barrier must be analyzed in the context of the
|
|
-- protected object, but its scope is external to it, just as any other
|
|
-- unprotected version of a protected operation. The specification has
|
|
-- been produced when the protected type declaration was elaborated. We
|
|
-- build the body, insert it in the enclosing scope, but analyze it in
|
|
-- the current context. A more uniform approach would be to treat the
|
|
-- barrier just as a protected function, and discard the protected
|
|
-- version of it because it is never called.
|
|
|
|
if Expander_Active then
|
|
B_F := Build_Barrier_Function (N, Ent, Prot);
|
|
Func := Barrier_Function (Ent);
|
|
Set_Corresponding_Spec (B_F, Func);
|
|
|
|
Body_Decl := Parent (Corresponding_Body (Spec_Decl));
|
|
|
|
if Nkind (Parent (Body_Decl)) = N_Subunit then
|
|
Body_Decl := Corresponding_Stub (Parent (Body_Decl));
|
|
end if;
|
|
|
|
Insert_Before_And_Analyze (Body_Decl, B_F);
|
|
|
|
Set_Discriminals (Spec_Decl);
|
|
Set_Scope (Func, Scope (Prot));
|
|
|
|
else
|
|
Analyze_And_Resolve (Cond, Any_Boolean);
|
|
end if;
|
|
|
|
-- Check Pure_Barriers restriction
|
|
|
|
if Check_Pure_Barriers (Cond) = Abandon then
|
|
Check_Restriction (Pure_Barriers, Cond);
|
|
end if;
|
|
|
|
-- The Ravenscar profile restricts barriers to simple variables declared
|
|
-- within the protected object. We also allow Boolean constants, since
|
|
-- these appear in several published examples and are also allowed by
|
|
-- other compilers.
|
|
|
|
-- Note that after analysis variables in this context will be replaced
|
|
-- by the corresponding prival, that is to say a renaming of a selected
|
|
-- component of the form _Object.Var. If expansion is disabled, as
|
|
-- within a generic, we check that the entity appears in the current
|
|
-- scope.
|
|
|
|
if Is_Entity_Name (Cond) then
|
|
|
|
-- A small optimization of useless renamings. If the scope of the
|
|
-- entity of the condition is not the barrier function, then the
|
|
-- condition does not reference any of the generated renamings
|
|
-- within the function.
|
|
|
|
if Expander_Active and then Scope (Entity (Cond)) /= Func then
|
|
Set_Declarations (B_F, Empty_List);
|
|
end if;
|
|
|
|
if Entity (Cond) = Standard_False
|
|
or else
|
|
Entity (Cond) = Standard_True
|
|
then
|
|
return;
|
|
|
|
elsif Is_Simple_Barrier_Name (Cond) then
|
|
return;
|
|
end if;
|
|
end if;
|
|
|
|
-- It is not a boolean variable or literal, so check the restriction.
|
|
-- Note that it is safe to be calling Check_Restriction from here, even
|
|
-- though this is part of the expander, since Expand_Entry_Barrier is
|
|
-- called from Sem_Ch9 even in -gnatc mode.
|
|
|
|
Check_Restriction (Simple_Barriers, Cond);
|
|
|
|
-- Emit warning if barrier contains global entities and is thus
|
|
-- potentially unsynchronized.
|
|
|
|
Check_Unprotected_Barrier (Cond);
|
|
end Expand_Entry_Barrier;
|
|
|
|
------------------------------
|
|
-- Expand_N_Abort_Statement --
|
|
------------------------------
|
|
|
|
-- Expand abort T1, T2, .. Tn; into:
|
|
-- Abort_Tasks (Task_List'(1 => T1.Task_Id, 2 => T2.Task_Id ...))
|
|
|
|
procedure Expand_N_Abort_Statement (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Tlist : constant List_Id := Names (N);
|
|
Count : Nat;
|
|
Aggr : Node_Id;
|
|
Tasknm : Node_Id;
|
|
|
|
begin
|
|
Aggr := Make_Aggregate (Loc, Component_Associations => New_List);
|
|
Count := 0;
|
|
|
|
Tasknm := First (Tlist);
|
|
|
|
while Present (Tasknm) loop
|
|
Count := Count + 1;
|
|
|
|
-- A task interface class-wide type object is being aborted. Retrieve
|
|
-- its _task_id by calling a dispatching routine.
|
|
|
|
if Ada_Version >= Ada_2005
|
|
and then Ekind (Etype (Tasknm)) = E_Class_Wide_Type
|
|
and then Is_Interface (Etype (Tasknm))
|
|
and then Is_Task_Interface (Etype (Tasknm))
|
|
then
|
|
Append_To (Component_Associations (Aggr),
|
|
Make_Component_Association (Loc,
|
|
Choices => New_List (Make_Integer_Literal (Loc, Count)),
|
|
Expression =>
|
|
|
|
-- Task_Id (Tasknm._disp_get_task_id)
|
|
|
|
Make_Unchecked_Type_Conversion (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (RO_ST_Task_Id), Loc),
|
|
Expression =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Copy_Tree (Tasknm),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Name_uDisp_Get_Task_Id)))));
|
|
|
|
else
|
|
Append_To (Component_Associations (Aggr),
|
|
Make_Component_Association (Loc,
|
|
Choices => New_List (Make_Integer_Literal (Loc, Count)),
|
|
Expression => Concurrent_Ref (Tasknm)));
|
|
end if;
|
|
|
|
Next (Tasknm);
|
|
end loop;
|
|
|
|
Rewrite (N,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Abort_Tasks), Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Qualified_Expression (Loc,
|
|
Subtype_Mark => New_Occurrence_Of (RTE (RE_Task_List), Loc),
|
|
Expression => Aggr))));
|
|
|
|
Analyze (N);
|
|
end Expand_N_Abort_Statement;
|
|
|
|
-------------------------------
|
|
-- Expand_N_Accept_Statement --
|
|
-------------------------------
|
|
|
|
-- This procedure handles expansion of accept statements that stand alone,
|
|
-- i.e. they are not part of an accept alternative. The expansion of
|
|
-- accept statement in accept alternatives is handled by the routines
|
|
-- Expand_N_Accept_Alternative and Expand_N_Selective_Accept. The
|
|
-- following description applies only to stand alone accept statements.
|
|
|
|
-- If there is no handled statement sequence, or only null statements, then
|
|
-- this is called a trivial accept, and the expansion is:
|
|
|
|
-- Accept_Trivial (entry-index)
|
|
|
|
-- If there is a handled statement sequence, then the expansion is:
|
|
|
|
-- Ann : Address;
|
|
-- {Lnn : Label}
|
|
|
|
-- begin
|
|
-- begin
|
|
-- Accept_Call (entry-index, Ann);
|
|
-- Renaming_Declarations for formals
|
|
-- <statement sequence from N_Accept_Statement node>
|
|
-- Complete_Rendezvous;
|
|
-- <<Lnn>>
|
|
--
|
|
-- exception
|
|
-- when ... =>
|
|
-- <exception handler from N_Accept_Statement node>
|
|
-- Complete_Rendezvous;
|
|
-- when ... =>
|
|
-- <exception handler from N_Accept_Statement node>
|
|
-- Complete_Rendezvous;
|
|
-- ...
|
|
-- end;
|
|
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
|
|
-- end;
|
|
|
|
-- The first three declarations were already inserted ahead of the accept
|
|
-- statement by the Expand_Accept_Declarations procedure, which was called
|
|
-- directly from the semantics during analysis of the accept statement,
|
|
-- before analyzing its contained statements.
|
|
|
|
-- The declarations from the N_Accept_Statement, as noted in Sinfo, come
|
|
-- from possible expansion activity (the original source of course does
|
|
-- not have any declarations associated with the accept statement, since
|
|
-- an accept statement has no declarative part). In particular, if the
|
|
-- expander is active, the first such declaration is the declaration of
|
|
-- the Accept_Params_Ptr entity (see Sem_Ch9.Analyze_Accept_Statement).
|
|
|
|
-- The two blocks are merged into a single block if the inner block has
|
|
-- no exception handlers, but otherwise two blocks are required, since
|
|
-- exceptions might be raised in the exception handlers of the inner
|
|
-- block, and Exceptional_Complete_Rendezvous must be called.
|
|
|
|
procedure Expand_N_Accept_Statement (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Stats : constant Node_Id := Handled_Statement_Sequence (N);
|
|
Ename : constant Node_Id := Entry_Direct_Name (N);
|
|
Eindx : constant Node_Id := Entry_Index (N);
|
|
Eent : constant Entity_Id := Entity (Ename);
|
|
Acstack : constant Elist_Id := Accept_Address (Eent);
|
|
Ann : constant Entity_Id := Node (Last_Elmt (Acstack));
|
|
Ttyp : constant Entity_Id := Etype (Scope (Eent));
|
|
Blkent : Entity_Id;
|
|
Call : Node_Id;
|
|
Block : Node_Id;
|
|
|
|
begin
|
|
-- If the accept statement is not part of a list, then its parent must
|
|
-- be an accept alternative, and, as described above, we do not do any
|
|
-- expansion for such accept statements at this level.
|
|
|
|
if not Is_List_Member (N) then
|
|
pragma Assert (Nkind (Parent (N)) = N_Accept_Alternative);
|
|
return;
|
|
|
|
-- Trivial accept case (no statement sequence, or null statements).
|
|
-- If the accept statement has declarations, then just insert them
|
|
-- before the procedure call.
|
|
|
|
elsif Trivial_Accept_OK
|
|
and then (No (Stats) or else Null_Statements (Statements (Stats)))
|
|
then
|
|
-- Remove declarations for renamings, because the parameter block
|
|
-- will not be assigned.
|
|
|
|
declare
|
|
D : Node_Id;
|
|
Next_D : Node_Id;
|
|
|
|
begin
|
|
D := First (Declarations (N));
|
|
while Present (D) loop
|
|
Next_D := Next (D);
|
|
if Nkind (D) = N_Object_Renaming_Declaration then
|
|
Remove (D);
|
|
end if;
|
|
|
|
D := Next_D;
|
|
end loop;
|
|
end;
|
|
|
|
if Present (Declarations (N)) then
|
|
Insert_Actions (N, Declarations (N));
|
|
end if;
|
|
|
|
Rewrite (N,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Accept_Trivial), Loc),
|
|
Parameter_Associations => New_List (
|
|
Entry_Index_Expression (Loc, Entity (Ename), Eindx, Ttyp))));
|
|
|
|
Analyze (N);
|
|
|
|
-- Discard Entry_Address that was created for it, so it will not be
|
|
-- emitted if this accept statement is in the statement part of a
|
|
-- delay alternative.
|
|
|
|
if Present (Stats) then
|
|
Remove_Last_Elmt (Acstack);
|
|
end if;
|
|
|
|
-- Case of statement sequence present
|
|
|
|
else
|
|
-- Construct the block, using the declarations from the accept
|
|
-- statement if any to initialize the declarations of the block.
|
|
|
|
Blkent := Make_Temporary (Loc, 'A');
|
|
Set_Ekind (Blkent, E_Block);
|
|
Set_Etype (Blkent, Standard_Void_Type);
|
|
Set_Scope (Blkent, Current_Scope);
|
|
|
|
Block :=
|
|
Make_Block_Statement (Loc,
|
|
Identifier => New_Occurrence_Of (Blkent, Loc),
|
|
Declarations => Declarations (N),
|
|
Handled_Statement_Sequence => Build_Accept_Body (N));
|
|
|
|
-- For the analysis of the generated declarations, the parent node
|
|
-- must be properly set.
|
|
|
|
Set_Parent (Block, Parent (N));
|
|
|
|
-- Prepend call to Accept_Call to main statement sequence If the
|
|
-- accept has exception handlers, the statement sequence is wrapped
|
|
-- in a block. Insert call and renaming declarations in the
|
|
-- declarations of the block, so they are elaborated before the
|
|
-- handlers.
|
|
|
|
Call :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Accept_Call), Loc),
|
|
Parameter_Associations => New_List (
|
|
Entry_Index_Expression (Loc, Entity (Ename), Eindx, Ttyp),
|
|
New_Occurrence_Of (Ann, Loc)));
|
|
|
|
if Parent (Stats) = N then
|
|
Prepend (Call, Statements (Stats));
|
|
else
|
|
Set_Declarations (Parent (Stats), New_List (Call));
|
|
end if;
|
|
|
|
Analyze (Call);
|
|
|
|
Push_Scope (Blkent);
|
|
|
|
declare
|
|
D : Node_Id;
|
|
Next_D : Node_Id;
|
|
Typ : Entity_Id;
|
|
|
|
begin
|
|
D := First (Declarations (N));
|
|
while Present (D) loop
|
|
Next_D := Next (D);
|
|
|
|
if Nkind (D) = N_Object_Renaming_Declaration then
|
|
|
|
-- The renaming declarations for the formals were created
|
|
-- during analysis of the accept statement, and attached to
|
|
-- the list of declarations. Place them now in the context
|
|
-- of the accept block or subprogram.
|
|
|
|
Remove (D);
|
|
Typ := Entity (Subtype_Mark (D));
|
|
Insert_After (Call, D);
|
|
Analyze (D);
|
|
|
|
-- If the formal is class_wide, it does not have an actual
|
|
-- subtype. The analysis of the renaming declaration creates
|
|
-- one, but we need to retain the class-wide nature of the
|
|
-- entity.
|
|
|
|
if Is_Class_Wide_Type (Typ) then
|
|
Set_Etype (Defining_Identifier (D), Typ);
|
|
end if;
|
|
|
|
end if;
|
|
|
|
D := Next_D;
|
|
end loop;
|
|
end;
|
|
|
|
End_Scope;
|
|
|
|
-- Replace the accept statement by the new block
|
|
|
|
Rewrite (N, Block);
|
|
Analyze (N);
|
|
|
|
-- Last step is to unstack the Accept_Address value
|
|
|
|
Remove_Last_Elmt (Acstack);
|
|
end if;
|
|
end Expand_N_Accept_Statement;
|
|
|
|
----------------------------------
|
|
-- Expand_N_Asynchronous_Select --
|
|
----------------------------------
|
|
|
|
-- This procedure assumes that the trigger statement is an entry call or
|
|
-- a dispatching procedure call. A delay alternative should already have
|
|
-- been expanded into an entry call to the appropriate delay object Wait
|
|
-- entry.
|
|
|
|
-- If the trigger is a task entry call, the select is implemented with
|
|
-- a Task_Entry_Call:
|
|
|
|
-- declare
|
|
-- B : Boolean;
|
|
-- C : Boolean;
|
|
-- P : parms := (parm, parm, parm);
|
|
|
|
-- -- Clean is added by Exp_Ch7.Expand_Cleanup_Actions
|
|
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- ...
|
|
-- Cancel_Task_Entry_Call (C);
|
|
-- ...
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- Abort_Defer;
|
|
-- Task_Entry_Call
|
|
-- (<acceptor-task>, -- Acceptor
|
|
-- <entry-index>, -- E
|
|
-- P'Address, -- Uninterpreted_Data
|
|
-- Asynchronous_Call, -- Mode
|
|
-- B); -- Rendezvous_Successful
|
|
|
|
-- begin
|
|
-- begin
|
|
-- Abort_Undefer;
|
|
-- <abortable-part>
|
|
-- at end
|
|
-- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
|
|
-- end;
|
|
-- exception
|
|
-- when Abort_Signal => Abort_Undefer;
|
|
-- end;
|
|
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- if not C then
|
|
-- <triggered-statements>
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- Note that Build_Simple_Entry_Call is used to expand the entry of the
|
|
-- asynchronous entry call (by Expand_N_Entry_Call_Statement procedure)
|
|
-- as follows:
|
|
|
|
-- declare
|
|
-- P : parms := (parm, parm, parm);
|
|
-- begin
|
|
-- Call_Simple (acceptor-task, entry-index, P'Address);
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- end;
|
|
|
|
-- so the task at hand is to convert the latter expansion into the former
|
|
|
|
-- If the trigger is a protected entry call, the select is implemented
|
|
-- with Protected_Entry_Call:
|
|
|
|
-- declare
|
|
-- P : E1_Params := (param, param, param);
|
|
-- Bnn : Communications_Block;
|
|
|
|
-- begin
|
|
-- declare
|
|
|
|
-- -- Clean is added by Exp_Ch7.Expand_Cleanup_Actions
|
|
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- ...
|
|
-- if Enqueued (Bnn) then
|
|
-- Cancel_Protected_Entry_Call (Bnn);
|
|
-- end if;
|
|
-- ...
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- begin
|
|
-- Protected_Entry_Call
|
|
-- (po._object'Access, -- Object
|
|
-- <entry index>, -- E
|
|
-- P'Address, -- Uninterpreted_Data
|
|
-- Asynchronous_Call, -- Mode
|
|
-- Bnn); -- Block
|
|
|
|
-- if Enqueued (Bnn) then
|
|
-- <abortable-part>
|
|
-- end if;
|
|
-- at end
|
|
-- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
|
|
-- end;
|
|
-- exception
|
|
-- when Abort_Signal => Abort_Undefer;
|
|
-- end;
|
|
|
|
-- if not Cancelled (Bnn) then
|
|
-- <triggered-statements>
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- Build_Simple_Entry_Call is used to expand the all to a simple protected
|
|
-- entry call:
|
|
|
|
-- declare
|
|
-- P : E1_Params := (param, param, param);
|
|
-- Bnn : Communications_Block;
|
|
|
|
-- begin
|
|
-- Protected_Entry_Call
|
|
-- (po._object'Access, -- Object
|
|
-- <entry index>, -- E
|
|
-- P'Address, -- Uninterpreted_Data
|
|
-- Simple_Call, -- Mode
|
|
-- Bnn); -- Block
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- end;
|
|
|
|
-- Ada 2005 (AI-345): If the trigger is a dispatching call, the select is
|
|
-- expanded into:
|
|
|
|
-- declare
|
|
-- B : Boolean := False;
|
|
-- Bnn : Communication_Block;
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
-- D : System.Storage_Elements.Dummy_Communication_Block;
|
|
-- K : Ada.Tags.Tagged_Kind :=
|
|
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
|
|
-- P : Parameters := (Param1 .. ParamN);
|
|
-- S : Integer;
|
|
-- U : Boolean;
|
|
|
|
-- begin
|
|
-- if K = Ada.Tags.TK_Limited_Tagged
|
|
-- or else K = Ada.Tags.TK_Tagged
|
|
-- then
|
|
-- <dispatching-call>;
|
|
-- <triggering-statements>;
|
|
|
|
-- else
|
|
-- S :=
|
|
-- Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (<object>), DT_Position (<dispatching-call>));
|
|
|
|
-- _Disp_Get_Prim_Op_Kind (<object>, S, C);
|
|
|
|
-- if C = POK_Protected_Entry then
|
|
-- declare
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- if Enqueued (Bnn) then
|
|
-- Cancel_Protected_Entry_Call (Bnn);
|
|
-- end if;
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- begin
|
|
-- _Disp_Asynchronous_Select
|
|
-- (<object>, S, P'Address, D, B);
|
|
-- Bnn := Communication_Block (D);
|
|
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
|
|
-- if Enqueued (Bnn) then
|
|
-- <abortable-statements>
|
|
-- end if;
|
|
-- at end
|
|
-- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
|
|
-- end;
|
|
-- exception
|
|
-- when Abort_Signal => Abort_Undefer;
|
|
-- end;
|
|
|
|
-- if not Cancelled (Bnn) then
|
|
-- <triggering-statements>
|
|
-- end if;
|
|
|
|
-- elsif C = POK_Task_Entry then
|
|
-- declare
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- Cancel_Task_Entry_Call (U);
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- Abort_Defer;
|
|
|
|
-- _Disp_Asynchronous_Select
|
|
-- (<object>, S, P'Address, D, B);
|
|
-- Bnn := Communication_Bloc (D);
|
|
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
|
|
-- begin
|
|
-- begin
|
|
-- Abort_Undefer;
|
|
-- <abortable-statements>
|
|
-- at end
|
|
-- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
|
|
-- end;
|
|
-- exception
|
|
-- when Abort_Signal => Abort_Undefer;
|
|
-- end;
|
|
|
|
-- if not U then
|
|
-- <triggering-statements>
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- else
|
|
-- <dispatching-call>;
|
|
-- <triggering-statements>
|
|
-- end if;
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- The job is to convert this to the asynchronous form
|
|
|
|
-- If the trigger is a delay statement, it will have been expanded into
|
|
-- a call to one of the GNARL delay procedures. This routine will convert
|
|
-- this into a protected entry call on a delay object and then continue
|
|
-- processing as for a protected entry call trigger. This requires
|
|
-- declaring a Delay_Block object and adding a pointer to this object to
|
|
-- the parameter list of the delay procedure to form the parameter list of
|
|
-- the entry call. This object is used by the runtime to queue the delay
|
|
-- request.
|
|
|
|
-- For a description of the use of P and the assignments after the call,
|
|
-- see Expand_N_Entry_Call_Statement.
|
|
|
|
procedure Expand_N_Asynchronous_Select (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Abrt : constant Node_Id := Abortable_Part (N);
|
|
Trig : constant Node_Id := Triggering_Alternative (N);
|
|
|
|
Abort_Block_Ent : Entity_Id;
|
|
Abortable_Block : Node_Id;
|
|
Actuals : List_Id;
|
|
Astats : List_Id;
|
|
Blk_Ent : constant Entity_Id := Make_Temporary (Loc, 'A');
|
|
Blk_Typ : Entity_Id;
|
|
Call : Node_Id;
|
|
Call_Ent : Entity_Id;
|
|
Cancel_Param : Entity_Id;
|
|
Cleanup_Block : Node_Id;
|
|
Cleanup_Block_Ent : Entity_Id;
|
|
Cleanup_Stmts : List_Id;
|
|
Conc_Typ_Stmts : List_Id;
|
|
Concval : Node_Id;
|
|
Dblock_Ent : Entity_Id;
|
|
Decl : Node_Id;
|
|
Decls : List_Id;
|
|
Ecall : Node_Id;
|
|
Ename : Node_Id;
|
|
Enqueue_Call : Node_Id;
|
|
Formals : List_Id;
|
|
Hdle : List_Id;
|
|
Handler_Stmt : Node_Id;
|
|
Index : Node_Id;
|
|
Lim_Typ_Stmts : List_Id;
|
|
N_Orig : Node_Id;
|
|
Obj : Entity_Id;
|
|
Param : Node_Id;
|
|
Params : List_Id;
|
|
Pdef : Entity_Id;
|
|
ProtE_Stmts : List_Id;
|
|
ProtP_Stmts : List_Id;
|
|
Stmt : Node_Id;
|
|
Stmts : List_Id;
|
|
TaskE_Stmts : List_Id;
|
|
Tstats : List_Id;
|
|
|
|
B : Entity_Id; -- Call status flag
|
|
Bnn : Entity_Id; -- Communication block
|
|
C : Entity_Id; -- Call kind
|
|
K : Entity_Id; -- Tagged kind
|
|
P : Entity_Id; -- Parameter block
|
|
S : Entity_Id; -- Primitive operation slot
|
|
T : Entity_Id; -- Additional status flag
|
|
|
|
procedure Rewrite_Abortable_Part;
|
|
-- If the trigger is a dispatching call, the expansion inserts multiple
|
|
-- copies of the abortable part. This is both inefficient, and may lead
|
|
-- to duplicate definitions that the back-end will reject, when the
|
|
-- abortable part includes loops. This procedure rewrites the abortable
|
|
-- part into a call to a generated procedure.
|
|
|
|
----------------------------
|
|
-- Rewrite_Abortable_Part --
|
|
----------------------------
|
|
|
|
procedure Rewrite_Abortable_Part is
|
|
Proc : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uA);
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
Decl :=
|
|
Make_Subprogram_Body (Loc,
|
|
Specification =>
|
|
Make_Procedure_Specification (Loc, Defining_Unit_Name => Proc),
|
|
Declarations => New_List,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Astats));
|
|
Insert_Before (N, Decl);
|
|
Analyze (Decl);
|
|
|
|
-- Rewrite abortable part into a call to this procedure.
|
|
|
|
Astats :=
|
|
New_List (
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (Proc, Loc)));
|
|
end Rewrite_Abortable_Part;
|
|
|
|
-- Start of processing for Expand_N_Asynchronous_Select
|
|
|
|
begin
|
|
-- Asynchronous select is not supported on restricted runtimes. Don't
|
|
-- try to expand.
|
|
|
|
if Restricted_Profile then
|
|
return;
|
|
end if;
|
|
|
|
Process_Statements_For_Controlled_Objects (Trig);
|
|
Process_Statements_For_Controlled_Objects (Abrt);
|
|
|
|
Ecall := Triggering_Statement (Trig);
|
|
|
|
Ensure_Statement_Present (Sloc (Ecall), Trig);
|
|
|
|
-- Retrieve Astats and Tstats now because the finalization machinery may
|
|
-- wrap them in blocks.
|
|
|
|
Astats := Statements (Abrt);
|
|
Tstats := Statements (Trig);
|
|
|
|
-- The arguments in the call may require dynamic allocation, and the
|
|
-- call statement may have been transformed into a block. The block
|
|
-- may contain additional declarations for internal entities, and the
|
|
-- original call is found by sequential search.
|
|
|
|
if Nkind (Ecall) = N_Block_Statement then
|
|
Ecall := First (Statements (Handled_Statement_Sequence (Ecall)));
|
|
while not Nkind_In (Ecall, N_Procedure_Call_Statement,
|
|
N_Entry_Call_Statement)
|
|
loop
|
|
Next (Ecall);
|
|
end loop;
|
|
end if;
|
|
|
|
-- This is either a dispatching call or a delay statement used as a
|
|
-- trigger which was expanded into a procedure call.
|
|
|
|
if Nkind (Ecall) = N_Procedure_Call_Statement then
|
|
if Ada_Version >= Ada_2005
|
|
and then
|
|
(No (Original_Node (Ecall))
|
|
or else not Nkind_In (Original_Node (Ecall),
|
|
N_Delay_Relative_Statement,
|
|
N_Delay_Until_Statement))
|
|
then
|
|
Extract_Dispatching_Call (Ecall, Call_Ent, Obj, Actuals, Formals);
|
|
|
|
Rewrite_Abortable_Part;
|
|
Decls := New_List;
|
|
Stmts := New_List;
|
|
|
|
-- Call status flag processing, generate:
|
|
-- B : Boolean := False;
|
|
|
|
B := Build_B (Loc, Decls);
|
|
|
|
-- Communication block processing, generate:
|
|
-- Bnn : Communication_Block;
|
|
|
|
Bnn := Make_Temporary (Loc, 'B');
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Bnn,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Communication_Block), Loc)));
|
|
|
|
-- Call kind processing, generate:
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
|
|
C := Build_C (Loc, Decls);
|
|
|
|
-- Tagged kind processing, generate:
|
|
-- K : Ada.Tags.Tagged_Kind :=
|
|
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
|
|
|
|
-- Dummy communication block, generate:
|
|
-- D : Dummy_Communication_Block;
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uD),
|
|
Object_Definition =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Dummy_Communication_Block), Loc)));
|
|
|
|
K := Build_K (Loc, Decls, Obj);
|
|
|
|
-- Parameter block processing
|
|
|
|
Blk_Typ := Build_Parameter_Block
|
|
(Loc, Actuals, Formals, Decls);
|
|
P := Parameter_Block_Pack
|
|
(Loc, Blk_Typ, Actuals, Formals, Decls, Stmts);
|
|
|
|
-- Dispatch table slot processing, generate:
|
|
-- S : Integer;
|
|
|
|
S := Build_S (Loc, Decls);
|
|
|
|
-- Additional status flag processing, generate:
|
|
-- Tnn : Boolean;
|
|
|
|
T := Make_Temporary (Loc, 'T');
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => T,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc)));
|
|
|
|
------------------------------
|
|
-- Protected entry handling --
|
|
------------------------------
|
|
|
|
-- Generate:
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
|
|
Cleanup_Stmts := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
|
|
|
|
-- Generate:
|
|
-- Bnn := Communication_Block (D);
|
|
|
|
Prepend_To (Cleanup_Stmts,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Bnn, Loc),
|
|
Expression =>
|
|
Make_Unchecked_Type_Conversion (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (RE_Communication_Block), Loc),
|
|
Expression => Make_Identifier (Loc, Name_uD))));
|
|
|
|
-- Generate:
|
|
-- _Disp_Asynchronous_Select (<object>, S, P'Address, D, B);
|
|
|
|
Prepend_To (Cleanup_Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(Find_Prim_Op
|
|
(Etype (Etype (Obj)), Name_uDisp_Asynchronous_Select),
|
|
Loc),
|
|
Parameter_Associations =>
|
|
New_List (
|
|
New_Copy_Tree (Obj), -- <object>
|
|
New_Occurrence_Of (S, Loc), -- S
|
|
Make_Attribute_Reference (Loc, -- P'Address
|
|
Prefix => New_Occurrence_Of (P, Loc),
|
|
Attribute_Name => Name_Address),
|
|
Make_Identifier (Loc, Name_uD), -- D
|
|
New_Occurrence_Of (B, Loc)))); -- B
|
|
|
|
-- Generate:
|
|
-- if Enqueued (Bnn) then
|
|
-- <abortable-statements>
|
|
-- end if;
|
|
|
|
Append_To (Cleanup_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Enqueued), Loc),
|
|
Parameter_Associations =>
|
|
New_List (New_Occurrence_Of (Bnn, Loc))),
|
|
|
|
Then_Statements =>
|
|
New_Copy_List_Tree (Astats)));
|
|
|
|
-- Wrap the statements in a block. Exp_Ch7.Expand_Cleanup_Actions
|
|
-- will then generate a _clean for the communication block Bnn.
|
|
|
|
-- Generate:
|
|
-- declare
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- if Enqueued (Bnn) then
|
|
-- Cancel_Protected_Entry_Call (Bnn);
|
|
-- end if;
|
|
-- end _clean;
|
|
-- begin
|
|
-- Cleanup_Stmts
|
|
-- at end
|
|
-- _clean;
|
|
-- end;
|
|
|
|
Cleanup_Block_Ent := Make_Temporary (Loc, 'C');
|
|
Cleanup_Block :=
|
|
Build_Cleanup_Block (Loc, Cleanup_Block_Ent, Cleanup_Stmts, Bnn);
|
|
|
|
-- Wrap the cleanup block in an exception handling block
|
|
|
|
-- Generate:
|
|
-- begin
|
|
-- Cleanup_Block
|
|
-- exception
|
|
-- when Abort_Signal => Abort_Undefer;
|
|
-- end;
|
|
|
|
Abort_Block_Ent := Make_Temporary (Loc, 'A');
|
|
ProtE_Stmts :=
|
|
New_List (
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Abort_Block_Ent),
|
|
|
|
Build_Abort_Block
|
|
(Loc, Abort_Block_Ent, Cleanup_Block_Ent, Cleanup_Block));
|
|
|
|
-- Generate:
|
|
-- if not Cancelled (Bnn) then
|
|
-- <triggering-statements>
|
|
-- end if;
|
|
|
|
Append_To (ProtE_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Op_Not (Loc,
|
|
Right_Opnd =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Cancelled), Loc),
|
|
Parameter_Associations =>
|
|
New_List (New_Occurrence_Of (Bnn, Loc)))),
|
|
|
|
Then_Statements =>
|
|
New_Copy_List_Tree (Tstats)));
|
|
|
|
-------------------------
|
|
-- Task entry handling --
|
|
-------------------------
|
|
|
|
-- Generate:
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
|
|
TaskE_Stmts := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
|
|
|
|
-- Generate:
|
|
-- Bnn := Communication_Block (D);
|
|
|
|
Append_To (TaskE_Stmts,
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Bnn, Loc),
|
|
Expression =>
|
|
Make_Unchecked_Type_Conversion (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (RE_Communication_Block), Loc),
|
|
Expression => Make_Identifier (Loc, Name_uD))));
|
|
|
|
-- Generate:
|
|
-- _Disp_Asynchronous_Select (<object>, S, P'Address, D, B);
|
|
|
|
Prepend_To (TaskE_Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (
|
|
Find_Prim_Op (Etype (Etype (Obj)),
|
|
Name_uDisp_Asynchronous_Select),
|
|
Loc),
|
|
|
|
Parameter_Associations => New_List (
|
|
New_Copy_Tree (Obj), -- <object>
|
|
New_Occurrence_Of (S, Loc), -- S
|
|
Make_Attribute_Reference (Loc, -- P'Address
|
|
Prefix => New_Occurrence_Of (P, Loc),
|
|
Attribute_Name => Name_Address),
|
|
Make_Identifier (Loc, Name_uD), -- D
|
|
New_Occurrence_Of (B, Loc)))); -- B
|
|
|
|
-- Generate:
|
|
-- Abort_Defer;
|
|
|
|
Prepend_To (TaskE_Stmts, Build_Runtime_Call (Loc, RE_Abort_Defer));
|
|
|
|
-- Generate:
|
|
-- Abort_Undefer;
|
|
-- <abortable-statements>
|
|
|
|
Cleanup_Stmts := New_Copy_List_Tree (Astats);
|
|
|
|
Prepend_To
|
|
(Cleanup_Stmts, Build_Runtime_Call (Loc, RE_Abort_Undefer));
|
|
|
|
-- Wrap the statements in a block. Exp_Ch7.Expand_Cleanup_Actions
|
|
-- will generate a _clean for the additional status flag.
|
|
|
|
-- Generate:
|
|
-- declare
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- Cancel_Task_Entry_Call (U);
|
|
-- end _clean;
|
|
-- begin
|
|
-- Cleanup_Stmts
|
|
-- at end
|
|
-- _clean;
|
|
-- end;
|
|
|
|
Cleanup_Block_Ent := Make_Temporary (Loc, 'C');
|
|
Cleanup_Block :=
|
|
Build_Cleanup_Block (Loc, Cleanup_Block_Ent, Cleanup_Stmts, T);
|
|
|
|
-- Wrap the cleanup block in an exception handling block
|
|
|
|
-- Generate:
|
|
-- begin
|
|
-- Cleanup_Block
|
|
-- exception
|
|
-- when Abort_Signal => Abort_Undefer;
|
|
-- end;
|
|
|
|
Abort_Block_Ent := Make_Temporary (Loc, 'A');
|
|
|
|
Append_To (TaskE_Stmts,
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Abort_Block_Ent));
|
|
|
|
Append_To (TaskE_Stmts,
|
|
Build_Abort_Block
|
|
(Loc, Abort_Block_Ent, Cleanup_Block_Ent, Cleanup_Block));
|
|
|
|
-- Generate:
|
|
-- if not T then
|
|
-- <triggering-statements>
|
|
-- end if;
|
|
|
|
Append_To (TaskE_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Op_Not (Loc, Right_Opnd => New_Occurrence_Of (T, Loc)),
|
|
|
|
Then_Statements =>
|
|
New_Copy_List_Tree (Tstats)));
|
|
|
|
----------------------------------
|
|
-- Protected procedure handling --
|
|
----------------------------------
|
|
|
|
-- Generate:
|
|
-- <dispatching-call>;
|
|
-- <triggering-statements>
|
|
|
|
ProtP_Stmts := New_Copy_List_Tree (Tstats);
|
|
Prepend_To (ProtP_Stmts, New_Copy_Tree (Ecall));
|
|
|
|
-- Generate:
|
|
-- S := Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (<object>), DT_Position (Call_Ent));
|
|
|
|
Conc_Typ_Stmts :=
|
|
New_List (Build_S_Assignment (Loc, S, Obj, Call_Ent));
|
|
|
|
-- Generate:
|
|
-- _Disp_Get_Prim_Op_Kind (<object>, S, C);
|
|
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(Find_Prim_Op (Etype (Etype (Obj)),
|
|
Name_uDisp_Get_Prim_Op_Kind),
|
|
Loc),
|
|
Parameter_Associations =>
|
|
New_List (
|
|
New_Copy_Tree (Obj),
|
|
New_Occurrence_Of (S, Loc),
|
|
New_Occurrence_Of (C, Loc))));
|
|
|
|
-- Generate:
|
|
-- if C = POK_Procedure_Entry then
|
|
-- ProtE_Stmts
|
|
-- elsif C = POK_Task_Entry then
|
|
-- TaskE_Stmts
|
|
-- else
|
|
-- ProtP_Stmts
|
|
-- end if;
|
|
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Protected_Entry), Loc)),
|
|
|
|
Then_Statements =>
|
|
ProtE_Stmts,
|
|
|
|
Elsif_Parts =>
|
|
New_List (
|
|
Make_Elsif_Part (Loc,
|
|
Condition =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Task_Entry), Loc)),
|
|
|
|
Then_Statements =>
|
|
TaskE_Stmts)),
|
|
|
|
Else_Statements =>
|
|
ProtP_Stmts));
|
|
|
|
-- Generate:
|
|
-- <dispatching-call>;
|
|
-- <triggering-statements>
|
|
|
|
Lim_Typ_Stmts := New_Copy_List_Tree (Tstats);
|
|
Prepend_To (Lim_Typ_Stmts, New_Copy_Tree (Ecall));
|
|
|
|
-- Generate:
|
|
-- if K = Ada.Tags.TK_Limited_Tagged
|
|
-- or else K = Ada.Tags.TK_Tagged
|
|
-- then
|
|
-- Lim_Typ_Stmts
|
|
-- else
|
|
-- Conc_Typ_Stmts
|
|
-- end if;
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Build_Dispatching_Tag_Check (K, N),
|
|
Then_Statements => Lim_Typ_Stmts,
|
|
Else_Statements => Conc_Typ_Stmts));
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations =>
|
|
Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
|
|
|
|
Analyze (N);
|
|
return;
|
|
|
|
-- Delay triggering statement processing
|
|
|
|
else
|
|
-- Add a Delay_Block object to the parameter list of the delay
|
|
-- procedure to form the parameter list of the Wait entry call.
|
|
|
|
Dblock_Ent := Make_Temporary (Loc, 'D');
|
|
|
|
Pdef := Entity (Name (Ecall));
|
|
|
|
if Is_RTE (Pdef, RO_CA_Delay_For) then
|
|
Enqueue_Call :=
|
|
New_Occurrence_Of (RTE (RE_Enqueue_Duration), Loc);
|
|
|
|
elsif Is_RTE (Pdef, RO_CA_Delay_Until) then
|
|
Enqueue_Call :=
|
|
New_Occurrence_Of (RTE (RE_Enqueue_Calendar), Loc);
|
|
|
|
else pragma Assert (Is_RTE (Pdef, RO_RT_Delay_Until));
|
|
Enqueue_Call := New_Occurrence_Of (RTE (RE_Enqueue_RT), Loc);
|
|
end if;
|
|
|
|
Append_To (Parameter_Associations (Ecall),
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Dblock_Ent, Loc),
|
|
Attribute_Name => Name_Unchecked_Access));
|
|
|
|
-- Create the inner block to protect the abortable part
|
|
|
|
Hdle := New_List (Build_Abort_Block_Handler (Loc));
|
|
|
|
Prepend_To (Astats, Build_Runtime_Call (Loc, RE_Abort_Undefer));
|
|
|
|
Abortable_Block :=
|
|
Make_Block_Statement (Loc,
|
|
Identifier => New_Occurrence_Of (Blk_Ent, Loc),
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Astats),
|
|
Has_Created_Identifier => True,
|
|
Is_Asynchronous_Call_Block => True);
|
|
|
|
-- Append call to if Enqueue (When, DB'Unchecked_Access) then
|
|
|
|
Rewrite (Ecall,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Function_Call (Loc,
|
|
Name => Enqueue_Call,
|
|
Parameter_Associations => Parameter_Associations (Ecall)),
|
|
Then_Statements =>
|
|
New_List (Make_Block_Statement (Loc,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Blk_Ent,
|
|
Label_Construct => Abortable_Block),
|
|
Abortable_Block),
|
|
Exception_Handlers => Hdle)))));
|
|
|
|
Stmts := New_List (Ecall);
|
|
|
|
-- Construct statement sequence for new block
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (
|
|
RTE (RE_Timed_Out), Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Dblock_Ent, Loc),
|
|
Attribute_Name => Name_Unchecked_Access))),
|
|
Then_Statements => Tstats));
|
|
|
|
-- The result is the new block
|
|
|
|
Set_Entry_Cancel_Parameter (Blk_Ent, Dblock_Ent);
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => New_List (
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Dblock_Ent,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Delay_Block), Loc))),
|
|
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
|
|
|
|
Analyze (N);
|
|
return;
|
|
end if;
|
|
|
|
else
|
|
N_Orig := N;
|
|
end if;
|
|
|
|
Extract_Entry (Ecall, Concval, Ename, Index);
|
|
Build_Simple_Entry_Call (Ecall, Concval, Ename, Index);
|
|
|
|
Stmts := Statements (Handled_Statement_Sequence (Ecall));
|
|
Decls := Declarations (Ecall);
|
|
|
|
if Is_Protected_Type (Etype (Concval)) then
|
|
|
|
-- Get the declarations of the block expanded from the entry call
|
|
|
|
Decl := First (Decls);
|
|
while Present (Decl)
|
|
and then (Nkind (Decl) /= N_Object_Declaration
|
|
or else not Is_RTE (Etype (Object_Definition (Decl)),
|
|
RE_Communication_Block))
|
|
loop
|
|
Next (Decl);
|
|
end loop;
|
|
|
|
pragma Assert (Present (Decl));
|
|
Cancel_Param := Defining_Identifier (Decl);
|
|
|
|
-- Change the mode of the Protected_Entry_Call call
|
|
|
|
-- Protected_Entry_Call (
|
|
-- Object => po._object'Access,
|
|
-- E => <entry index>;
|
|
-- Uninterpreted_Data => P'Address;
|
|
-- Mode => Asynchronous_Call;
|
|
-- Block => Bnn);
|
|
|
|
-- Skip assignments to temporaries created for in-out parameters
|
|
|
|
-- This makes unwarranted assumptions about the shape of the expanded
|
|
-- tree for the call, and should be cleaned up ???
|
|
|
|
Stmt := First (Stmts);
|
|
while Nkind (Stmt) /= N_Procedure_Call_Statement loop
|
|
Next (Stmt);
|
|
end loop;
|
|
|
|
Call := Stmt;
|
|
|
|
Param := First (Parameter_Associations (Call));
|
|
while Present (Param)
|
|
and then not Is_RTE (Etype (Param), RE_Call_Modes)
|
|
loop
|
|
Next (Param);
|
|
end loop;
|
|
|
|
pragma Assert (Present (Param));
|
|
Rewrite (Param, New_Occurrence_Of (RTE (RE_Asynchronous_Call), Loc));
|
|
Analyze (Param);
|
|
|
|
-- Append an if statement to execute the abortable part
|
|
|
|
-- Generate:
|
|
-- if Enqueued (Bnn) then
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Enqueued), Loc),
|
|
Parameter_Associations => New_List (
|
|
New_Occurrence_Of (Cancel_Param, Loc))),
|
|
Then_Statements => Astats));
|
|
|
|
Abortable_Block :=
|
|
Make_Block_Statement (Loc,
|
|
Identifier => New_Occurrence_Of (Blk_Ent, Loc),
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Statements => Stmts),
|
|
Has_Created_Identifier => True,
|
|
Is_Asynchronous_Call_Block => True);
|
|
|
|
-- Aborts are not deferred at beginning of exception handlers in
|
|
-- ZCX mode.
|
|
|
|
if ZCX_Exceptions then
|
|
Handler_Stmt := Make_Null_Statement (Loc);
|
|
|
|
else
|
|
Handler_Stmt := Build_Runtime_Call (Loc, RE_Abort_Undefer);
|
|
end if;
|
|
|
|
Stmts := New_List (
|
|
Make_Block_Statement (Loc,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Blk_Ent,
|
|
Label_Construct => Abortable_Block),
|
|
Abortable_Block),
|
|
|
|
-- exception
|
|
|
|
Exception_Handlers => New_List (
|
|
Make_Implicit_Exception_Handler (Loc,
|
|
|
|
-- when Abort_Signal =>
|
|
-- Abort_Undefer.all;
|
|
|
|
Exception_Choices =>
|
|
New_List (New_Occurrence_Of (Stand.Abort_Signal, Loc)),
|
|
Statements => New_List (Handler_Stmt))))),
|
|
|
|
-- if not Cancelled (Bnn) then
|
|
-- triggered statements
|
|
-- end if;
|
|
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Make_Op_Not (Loc,
|
|
Right_Opnd =>
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Cancelled), Loc),
|
|
Parameter_Associations => New_List (
|
|
New_Occurrence_Of (Cancel_Param, Loc)))),
|
|
Then_Statements => Tstats));
|
|
|
|
-- Asynchronous task entry call
|
|
|
|
else
|
|
if No (Decls) then
|
|
Decls := New_List;
|
|
end if;
|
|
|
|
B := Make_Defining_Identifier (Loc, Name_uB);
|
|
|
|
-- Insert declaration of B in declarations of existing block
|
|
|
|
Prepend_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => B,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc)));
|
|
|
|
Cancel_Param := Make_Defining_Identifier (Loc, Name_uC);
|
|
|
|
-- Insert declaration of C in declarations of existing block
|
|
|
|
Prepend_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Cancel_Param,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc)));
|
|
|
|
-- Remove and save the call to Call_Simple
|
|
|
|
Stmt := First (Stmts);
|
|
|
|
-- Skip assignments to temporaries created for in-out parameters.
|
|
-- This makes unwarranted assumptions about the shape of the expanded
|
|
-- tree for the call, and should be cleaned up ???
|
|
|
|
while Nkind (Stmt) /= N_Procedure_Call_Statement loop
|
|
Next (Stmt);
|
|
end loop;
|
|
|
|
Call := Stmt;
|
|
|
|
-- Create the inner block to protect the abortable part
|
|
|
|
Hdle := New_List (Build_Abort_Block_Handler (Loc));
|
|
|
|
Prepend_To (Astats, Build_Runtime_Call (Loc, RE_Abort_Undefer));
|
|
|
|
Abortable_Block :=
|
|
Make_Block_Statement (Loc,
|
|
Identifier => New_Occurrence_Of (Blk_Ent, Loc),
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Statements => Astats),
|
|
Has_Created_Identifier => True,
|
|
Is_Asynchronous_Call_Block => True);
|
|
|
|
Insert_After (Call,
|
|
Make_Block_Statement (Loc,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => New_List (
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier => Blk_Ent,
|
|
Label_Construct => Abortable_Block),
|
|
Abortable_Block),
|
|
Exception_Handlers => Hdle)));
|
|
|
|
-- Create new call statement
|
|
|
|
Params := Parameter_Associations (Call);
|
|
|
|
Append_To (Params,
|
|
New_Occurrence_Of (RTE (RE_Asynchronous_Call), Loc));
|
|
Append_To (Params, New_Occurrence_Of (B, Loc));
|
|
|
|
Rewrite (Call,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Task_Entry_Call), Loc),
|
|
Parameter_Associations => Params));
|
|
|
|
-- Construct statement sequence for new block
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Op_Not (Loc, New_Occurrence_Of (Cancel_Param, Loc)),
|
|
Then_Statements => Tstats));
|
|
|
|
-- Protected the call against abort
|
|
|
|
Prepend_To (Stmts, Build_Runtime_Call (Loc, RE_Abort_Defer));
|
|
end if;
|
|
|
|
Set_Entry_Cancel_Parameter (Blk_Ent, Cancel_Param);
|
|
|
|
-- The result is the new block
|
|
|
|
Rewrite (N_Orig,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
|
|
|
|
Analyze (N_Orig);
|
|
end Expand_N_Asynchronous_Select;
|
|
|
|
-------------------------------------
|
|
-- Expand_N_Conditional_Entry_Call --
|
|
-------------------------------------
|
|
|
|
-- The conditional task entry call is converted to a call to
|
|
-- Task_Entry_Call:
|
|
|
|
-- declare
|
|
-- B : Boolean;
|
|
-- P : parms := (parm, parm, parm);
|
|
|
|
-- begin
|
|
-- Task_Entry_Call
|
|
-- (<acceptor-task>, -- Acceptor
|
|
-- <entry-index>, -- E
|
|
-- P'Address, -- Uninterpreted_Data
|
|
-- Conditional_Call, -- Mode
|
|
-- B); -- Rendezvous_Successful
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- if B then
|
|
-- normal-statements
|
|
-- else
|
|
-- else-statements
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- For a description of the use of P and the assignments after the call,
|
|
-- see Expand_N_Entry_Call_Statement. Note that the entry call of the
|
|
-- conditional entry call has already been expanded (by the Expand_N_Entry
|
|
-- _Call_Statement procedure) as follows:
|
|
|
|
-- declare
|
|
-- P : parms := (parm, parm, parm);
|
|
-- begin
|
|
-- ... info for in-out parameters
|
|
-- Call_Simple (acceptor-task, entry-index, P'Address);
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- end;
|
|
|
|
-- so the task at hand is to convert the latter expansion into the former
|
|
|
|
-- The conditional protected entry call is converted to a call to
|
|
-- Protected_Entry_Call:
|
|
|
|
-- declare
|
|
-- P : parms := (parm, parm, parm);
|
|
-- Bnn : Communications_Block;
|
|
|
|
-- begin
|
|
-- Protected_Entry_Call
|
|
-- (po._object'Access, -- Object
|
|
-- <entry index>, -- E
|
|
-- P'Address, -- Uninterpreted_Data
|
|
-- Conditional_Call, -- Mode
|
|
-- Bnn); -- Block
|
|
-- parm := P.param;
|
|
-- parm := P.param;
|
|
-- ...
|
|
-- if Cancelled (Bnn) then
|
|
-- else-statements
|
|
-- else
|
|
-- normal-statements
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- Ada 2005 (AI-345): A dispatching conditional entry call is converted
|
|
-- into:
|
|
|
|
-- declare
|
|
-- B : Boolean := False;
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
-- K : Ada.Tags.Tagged_Kind :=
|
|
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
|
|
-- P : Parameters := (Param1 .. ParamN);
|
|
-- S : Integer;
|
|
|
|
-- begin
|
|
-- if K = Ada.Tags.TK_Limited_Tagged
|
|
-- or else K = Ada.Tags.TK_Tagged
|
|
-- then
|
|
-- <dispatching-call>;
|
|
-- <triggering-statements>
|
|
|
|
-- else
|
|
-- S :=
|
|
-- Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (<object>), DT_Position (<dispatching-call>));
|
|
|
|
-- _Disp_Conditional_Select (<object>, S, P'Address, C, B);
|
|
|
|
-- if C = POK_Protected_Entry
|
|
-- or else C = POK_Task_Entry
|
|
-- then
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
-- end if;
|
|
|
|
-- if B then
|
|
-- if C = POK_Procedure
|
|
-- or else C = POK_Protected_Procedure
|
|
-- or else C = POK_Task_Procedure
|
|
-- then
|
|
-- <dispatching-call>;
|
|
-- end if;
|
|
|
|
-- <triggering-statements>
|
|
-- else
|
|
-- <else-statements>
|
|
-- end if;
|
|
-- end if;
|
|
-- end;
|
|
|
|
procedure Expand_N_Conditional_Entry_Call (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Alt : constant Node_Id := Entry_Call_Alternative (N);
|
|
Blk : Node_Id := Entry_Call_Statement (Alt);
|
|
|
|
Actuals : List_Id;
|
|
Blk_Typ : Entity_Id;
|
|
Call : Node_Id;
|
|
Call_Ent : Entity_Id;
|
|
Conc_Typ_Stmts : List_Id;
|
|
Decl : Node_Id;
|
|
Decls : List_Id;
|
|
Formals : List_Id;
|
|
Lim_Typ_Stmts : List_Id;
|
|
N_Stats : List_Id;
|
|
Obj : Entity_Id;
|
|
Param : Node_Id;
|
|
Params : List_Id;
|
|
Stmt : Node_Id;
|
|
Stmts : List_Id;
|
|
Transient_Blk : Node_Id;
|
|
Unpack : List_Id;
|
|
|
|
B : Entity_Id; -- Call status flag
|
|
C : Entity_Id; -- Call kind
|
|
K : Entity_Id; -- Tagged kind
|
|
P : Entity_Id; -- Parameter block
|
|
S : Entity_Id; -- Primitive operation slot
|
|
|
|
begin
|
|
Process_Statements_For_Controlled_Objects (N);
|
|
|
|
if Ada_Version >= Ada_2005
|
|
and then Nkind (Blk) = N_Procedure_Call_Statement
|
|
then
|
|
Extract_Dispatching_Call (Blk, Call_Ent, Obj, Actuals, Formals);
|
|
|
|
Decls := New_List;
|
|
Stmts := New_List;
|
|
|
|
-- Call status flag processing, generate:
|
|
-- B : Boolean := False;
|
|
|
|
B := Build_B (Loc, Decls);
|
|
|
|
-- Call kind processing, generate:
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
|
|
C := Build_C (Loc, Decls);
|
|
|
|
-- Tagged kind processing, generate:
|
|
-- K : Ada.Tags.Tagged_Kind :=
|
|
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
|
|
|
|
K := Build_K (Loc, Decls, Obj);
|
|
|
|
-- Parameter block processing
|
|
|
|
Blk_Typ := Build_Parameter_Block (Loc, Actuals, Formals, Decls);
|
|
P := Parameter_Block_Pack
|
|
(Loc, Blk_Typ, Actuals, Formals, Decls, Stmts);
|
|
|
|
-- Dispatch table slot processing, generate:
|
|
-- S : Integer;
|
|
|
|
S := Build_S (Loc, Decls);
|
|
|
|
-- Generate:
|
|
-- S := Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (<object>), DT_Position (Call_Ent));
|
|
|
|
Conc_Typ_Stmts :=
|
|
New_List (Build_S_Assignment (Loc, S, Obj, Call_Ent));
|
|
|
|
-- Generate:
|
|
-- _Disp_Conditional_Select (<object>, S, P'Address, C, B);
|
|
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (
|
|
Find_Prim_Op (Etype (Etype (Obj)),
|
|
Name_uDisp_Conditional_Select),
|
|
Loc),
|
|
Parameter_Associations =>
|
|
New_List (
|
|
New_Copy_Tree (Obj), -- <object>
|
|
New_Occurrence_Of (S, Loc), -- S
|
|
Make_Attribute_Reference (Loc, -- P'Address
|
|
Prefix => New_Occurrence_Of (P, Loc),
|
|
Attribute_Name => Name_Address),
|
|
New_Occurrence_Of (C, Loc), -- C
|
|
New_Occurrence_Of (B, Loc)))); -- B
|
|
|
|
-- Generate:
|
|
-- if C = POK_Protected_Entry
|
|
-- or else C = POK_Task_Entry
|
|
-- then
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
-- end if;
|
|
|
|
Unpack := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
|
|
|
|
-- Generate the if statement only when the packed parameters need
|
|
-- explicit assignments to their corresponding actuals.
|
|
|
|
if Present (Unpack) then
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Or_Else (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (
|
|
RE_POK_Protected_Entry), Loc)),
|
|
|
|
Right_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Task_Entry), Loc))),
|
|
|
|
Then_Statements => Unpack));
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- if B then
|
|
-- if C = POK_Procedure
|
|
-- or else C = POK_Protected_Procedure
|
|
-- or else C = POK_Task_Procedure
|
|
-- then
|
|
-- <dispatching-call>
|
|
-- end if;
|
|
-- <normal-statements>
|
|
-- else
|
|
-- <else-statements>
|
|
-- end if;
|
|
|
|
N_Stats := New_Copy_List_Tree (Statements (Alt));
|
|
|
|
Prepend_To (N_Stats,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Or_Else (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Procedure), Loc)),
|
|
|
|
Right_Opnd =>
|
|
Make_Or_Else (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (
|
|
RE_POK_Protected_Procedure), Loc)),
|
|
|
|
Right_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (
|
|
RE_POK_Task_Procedure), Loc)))),
|
|
|
|
Then_Statements =>
|
|
New_List (Blk)));
|
|
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => New_Occurrence_Of (B, Loc),
|
|
Then_Statements => N_Stats,
|
|
Else_Statements => Else_Statements (N)));
|
|
|
|
-- Generate:
|
|
-- <dispatching-call>;
|
|
-- <triggering-statements>
|
|
|
|
Lim_Typ_Stmts := New_Copy_List_Tree (Statements (Alt));
|
|
Prepend_To (Lim_Typ_Stmts, New_Copy_Tree (Blk));
|
|
|
|
-- Generate:
|
|
-- if K = Ada.Tags.TK_Limited_Tagged
|
|
-- or else K = Ada.Tags.TK_Tagged
|
|
-- then
|
|
-- Lim_Typ_Stmts
|
|
-- else
|
|
-- Conc_Typ_Stmts
|
|
-- end if;
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Build_Dispatching_Tag_Check (K, N),
|
|
Then_Statements => Lim_Typ_Stmts,
|
|
Else_Statements => Conc_Typ_Stmts));
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations =>
|
|
Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
|
|
|
|
-- As described above, the entry alternative is transformed into a
|
|
-- block that contains the gnulli call, and possibly assignment
|
|
-- statements for in-out parameters. The gnulli call may itself be
|
|
-- rewritten into a transient block if some unconstrained parameters
|
|
-- require it. We need to retrieve the call to complete its parameter
|
|
-- list.
|
|
|
|
else
|
|
Transient_Blk :=
|
|
First_Real_Statement (Handled_Statement_Sequence (Blk));
|
|
|
|
if Present (Transient_Blk)
|
|
and then Nkind (Transient_Blk) = N_Block_Statement
|
|
then
|
|
Blk := Transient_Blk;
|
|
end if;
|
|
|
|
Stmts := Statements (Handled_Statement_Sequence (Blk));
|
|
Stmt := First (Stmts);
|
|
while Nkind (Stmt) /= N_Procedure_Call_Statement loop
|
|
Next (Stmt);
|
|
end loop;
|
|
|
|
Call := Stmt;
|
|
Params := Parameter_Associations (Call);
|
|
|
|
if Is_RTE (Entity (Name (Call)), RE_Protected_Entry_Call) then
|
|
|
|
-- Substitute Conditional_Entry_Call for Simple_Call parameter
|
|
|
|
Param := First (Params);
|
|
while Present (Param)
|
|
and then not Is_RTE (Etype (Param), RE_Call_Modes)
|
|
loop
|
|
Next (Param);
|
|
end loop;
|
|
|
|
pragma Assert (Present (Param));
|
|
Rewrite (Param,
|
|
New_Occurrence_Of (RTE (RE_Conditional_Call), Loc));
|
|
|
|
Analyze (Param);
|
|
|
|
-- Find the Communication_Block parameter for the call to the
|
|
-- Cancelled function.
|
|
|
|
Decl := First (Declarations (Blk));
|
|
while Present (Decl)
|
|
and then not Is_RTE (Etype (Object_Definition (Decl)),
|
|
RE_Communication_Block)
|
|
loop
|
|
Next (Decl);
|
|
end loop;
|
|
|
|
-- Add an if statement to execute the else part if the call
|
|
-- does not succeed (as indicated by the Cancelled predicate).
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Cancelled), Loc),
|
|
Parameter_Associations => New_List (
|
|
New_Occurrence_Of (Defining_Identifier (Decl), Loc))),
|
|
Then_Statements => Else_Statements (N),
|
|
Else_Statements => Statements (Alt)));
|
|
|
|
else
|
|
B := Make_Defining_Identifier (Loc, Name_uB);
|
|
|
|
-- Insert declaration of B in declarations of existing block
|
|
|
|
if No (Declarations (Blk)) then
|
|
Set_Declarations (Blk, New_List);
|
|
end if;
|
|
|
|
Prepend_To (Declarations (Blk),
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => B,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc)));
|
|
|
|
-- Create new call statement
|
|
|
|
Append_To (Params,
|
|
New_Occurrence_Of (RTE (RE_Conditional_Call), Loc));
|
|
Append_To (Params, New_Occurrence_Of (B, Loc));
|
|
|
|
Rewrite (Call,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Task_Entry_Call), Loc),
|
|
Parameter_Associations => Params));
|
|
|
|
-- Construct statement sequence for new block
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => New_Occurrence_Of (B, Loc),
|
|
Then_Statements => Statements (Alt),
|
|
Else_Statements => Else_Statements (N)));
|
|
end if;
|
|
|
|
-- The result is the new block
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Declarations (Blk),
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
|
|
end if;
|
|
|
|
Analyze (N);
|
|
end Expand_N_Conditional_Entry_Call;
|
|
|
|
---------------------------------------
|
|
-- Expand_N_Delay_Relative_Statement --
|
|
---------------------------------------
|
|
|
|
-- Delay statement is implemented as a procedure call to Delay_For
|
|
-- defined in Ada.Calendar.Delays in order to reduce the overhead of
|
|
-- simple delays imposed by the use of Protected Objects.
|
|
|
|
procedure Expand_N_Delay_Relative_Statement (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Proc : Entity_Id;
|
|
|
|
begin
|
|
-- Try to use System.Relative_Delays.Delay_For only if available. This
|
|
-- is the implementation used on restricted platforms when Ada.Calendar
|
|
-- is not available.
|
|
|
|
if RTE_Available (RO_RD_Delay_For) then
|
|
Proc := RTE (RO_RD_Delay_For);
|
|
|
|
-- Otherwise, use Ada.Calendar.Delays.Delay_For and emit an error
|
|
-- message if not available.
|
|
|
|
else
|
|
Proc := RTE (RO_CA_Delay_For);
|
|
end if;
|
|
|
|
Rewrite (N,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (Proc, Loc),
|
|
Parameter_Associations => New_List (Expression (N))));
|
|
Analyze (N);
|
|
end Expand_N_Delay_Relative_Statement;
|
|
|
|
------------------------------------
|
|
-- Expand_N_Delay_Until_Statement --
|
|
------------------------------------
|
|
|
|
-- Delay Until statement is implemented as a procedure call to
|
|
-- Delay_Until defined in Ada.Calendar.Delays and Ada.Real_Time.Delays.
|
|
|
|
procedure Expand_N_Delay_Until_Statement (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Typ : Entity_Id;
|
|
|
|
begin
|
|
if Is_RTE (Base_Type (Etype (Expression (N))), RO_CA_Time) then
|
|
Typ := RTE (RO_CA_Delay_Until);
|
|
else
|
|
Typ := RTE (RO_RT_Delay_Until);
|
|
end if;
|
|
|
|
Rewrite (N,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (Typ, Loc),
|
|
Parameter_Associations => New_List (Expression (N))));
|
|
|
|
Analyze (N);
|
|
end Expand_N_Delay_Until_Statement;
|
|
|
|
-------------------------
|
|
-- Expand_N_Entry_Body --
|
|
-------------------------
|
|
|
|
procedure Expand_N_Entry_Body (N : Node_Id) is
|
|
begin
|
|
-- Associate discriminals with the next protected operation body to be
|
|
-- expanded.
|
|
|
|
if Present (Next_Protected_Operation (N)) then
|
|
Set_Discriminals (Parent (Current_Scope));
|
|
end if;
|
|
end Expand_N_Entry_Body;
|
|
|
|
-----------------------------------
|
|
-- Expand_N_Entry_Call_Statement --
|
|
-----------------------------------
|
|
|
|
-- An entry call is expanded into GNARLI calls to implement a simple entry
|
|
-- call (see Build_Simple_Entry_Call).
|
|
|
|
procedure Expand_N_Entry_Call_Statement (N : Node_Id) is
|
|
Concval : Node_Id;
|
|
Ename : Node_Id;
|
|
Index : Node_Id;
|
|
|
|
begin
|
|
if No_Run_Time_Mode then
|
|
Error_Msg_CRT ("entry call", N);
|
|
return;
|
|
end if;
|
|
|
|
-- If this entry call is part of an asynchronous select, don't expand it
|
|
-- here; it will be expanded with the select statement. Don't expand
|
|
-- timed entry calls either, as they are translated into asynchronous
|
|
-- entry calls.
|
|
|
|
-- ??? This whole approach is questionable; it may be better to go back
|
|
-- to allowing the expansion to take place and then attempting to fix it
|
|
-- up in Expand_N_Asynchronous_Select. The tricky part is figuring out
|
|
-- whether the expanded call is on a task or protected entry.
|
|
|
|
if (Nkind (Parent (N)) /= N_Triggering_Alternative
|
|
or else N /= Triggering_Statement (Parent (N)))
|
|
and then (Nkind (Parent (N)) /= N_Entry_Call_Alternative
|
|
or else N /= Entry_Call_Statement (Parent (N))
|
|
or else Nkind (Parent (Parent (N))) /= N_Timed_Entry_Call)
|
|
then
|
|
Extract_Entry (N, Concval, Ename, Index);
|
|
Build_Simple_Entry_Call (N, Concval, Ename, Index);
|
|
end if;
|
|
end Expand_N_Entry_Call_Statement;
|
|
|
|
--------------------------------
|
|
-- Expand_N_Entry_Declaration --
|
|
--------------------------------
|
|
|
|
-- If there are parameters, then first, each of the formals is marked by
|
|
-- setting Is_Entry_Formal. Next a record type is built which is used to
|
|
-- hold the parameter values. The name of this record type is entryP where
|
|
-- entry is the name of the entry, with an additional corresponding access
|
|
-- type called entryPA. The record type has matching components for each
|
|
-- formal (the component names are the same as the formal names). For
|
|
-- elementary types, the component type matches the formal type. For
|
|
-- composite types, an access type is declared (with the name formalA)
|
|
-- which designates the formal type, and the type of the component is this
|
|
-- access type. Finally the Entry_Component of each formal is set to
|
|
-- reference the corresponding record component.
|
|
|
|
procedure Expand_N_Entry_Declaration (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Entry_Ent : constant Entity_Id := Defining_Identifier (N);
|
|
Components : List_Id;
|
|
Formal : Node_Id;
|
|
Ftype : Entity_Id;
|
|
Last_Decl : Node_Id;
|
|
Component : Entity_Id;
|
|
Ctype : Entity_Id;
|
|
Decl : Node_Id;
|
|
Rec_Ent : Entity_Id;
|
|
Acc_Ent : Entity_Id;
|
|
|
|
begin
|
|
Formal := First_Formal (Entry_Ent);
|
|
Last_Decl := N;
|
|
|
|
-- Most processing is done only if parameters are present
|
|
|
|
if Present (Formal) then
|
|
Components := New_List;
|
|
|
|
-- Loop through formals
|
|
|
|
while Present (Formal) loop
|
|
Set_Is_Entry_Formal (Formal);
|
|
Component :=
|
|
Make_Defining_Identifier (Sloc (Formal), Chars (Formal));
|
|
Set_Entry_Component (Formal, Component);
|
|
Set_Entry_Formal (Component, Formal);
|
|
Ftype := Etype (Formal);
|
|
|
|
-- Declare new access type and then append
|
|
|
|
Ctype := Make_Temporary (Loc, 'A');
|
|
Set_Is_Param_Block_Component_Type (Ctype);
|
|
|
|
Decl :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Ctype,
|
|
Type_Definition =>
|
|
Make_Access_To_Object_Definition (Loc,
|
|
All_Present => True,
|
|
Constant_Present => Ekind (Formal) = E_In_Parameter,
|
|
Subtype_Indication => New_Occurrence_Of (Ftype, Loc)));
|
|
|
|
Insert_After (Last_Decl, Decl);
|
|
Last_Decl := Decl;
|
|
|
|
Append_To (Components,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier => Component,
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication => New_Occurrence_Of (Ctype, Loc))));
|
|
|
|
Next_Formal_With_Extras (Formal);
|
|
end loop;
|
|
|
|
-- Create the Entry_Parameter_Record declaration
|
|
|
|
Rec_Ent := Make_Temporary (Loc, 'P');
|
|
|
|
Decl :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Rec_Ent,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Component_List =>
|
|
Make_Component_List (Loc,
|
|
Component_Items => Components)));
|
|
|
|
Insert_After (Last_Decl, Decl);
|
|
Last_Decl := Decl;
|
|
|
|
-- Construct and link in the corresponding access type
|
|
|
|
Acc_Ent := Make_Temporary (Loc, 'A');
|
|
|
|
Set_Entry_Parameters_Type (Entry_Ent, Acc_Ent);
|
|
|
|
Decl :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Acc_Ent,
|
|
Type_Definition =>
|
|
Make_Access_To_Object_Definition (Loc,
|
|
All_Present => True,
|
|
Subtype_Indication => New_Occurrence_Of (Rec_Ent, Loc)));
|
|
|
|
Insert_After (Last_Decl, Decl);
|
|
end if;
|
|
end Expand_N_Entry_Declaration;
|
|
|
|
-----------------------------
|
|
-- Expand_N_Protected_Body --
|
|
-----------------------------
|
|
|
|
-- Protected bodies are expanded to the completion of the subprograms
|
|
-- created for the corresponding protected type. These are a protected and
|
|
-- unprotected version of each protected subprogram in the object, a
|
|
-- function to calculate each entry barrier, and a procedure to execute the
|
|
-- sequence of statements of each protected entry body. For example, for
|
|
-- protected type ptype:
|
|
|
|
-- function entB
|
|
-- (O : System.Address;
|
|
-- E : Protected_Entry_Index)
|
|
-- return Boolean
|
|
-- is
|
|
-- <discriminant renamings>
|
|
-- <private object renamings>
|
|
-- begin
|
|
-- return <barrier expression>;
|
|
-- end entB;
|
|
|
|
-- procedure pprocN (_object : in out poV;...) is
|
|
-- <discriminant renamings>
|
|
-- <private object renamings>
|
|
-- begin
|
|
-- <sequence of statements>
|
|
-- end pprocN;
|
|
|
|
-- procedure pprocP (_object : in out poV;...) is
|
|
-- procedure _clean is
|
|
-- Pn : Boolean;
|
|
-- begin
|
|
-- ptypeS (_object, Pn);
|
|
-- Unlock (_object._object'Access);
|
|
-- Abort_Undefer.all;
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- Abort_Defer.all;
|
|
-- Lock (_object._object'Access);
|
|
-- pprocN (_object;...);
|
|
-- at end
|
|
-- _clean;
|
|
-- end pproc;
|
|
|
|
-- function pfuncN (_object : poV;...) return Return_Type is
|
|
-- <discriminant renamings>
|
|
-- <private object renamings>
|
|
-- begin
|
|
-- <sequence of statements>
|
|
-- end pfuncN;
|
|
|
|
-- function pfuncP (_object : poV) return Return_Type is
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- Unlock (_object._object'Access);
|
|
-- Abort_Undefer.all;
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- Abort_Defer.all;
|
|
-- Lock (_object._object'Access);
|
|
-- return pfuncN (_object);
|
|
|
|
-- at end
|
|
-- _clean;
|
|
-- end pfunc;
|
|
|
|
-- procedure entE
|
|
-- (O : System.Address;
|
|
-- P : System.Address;
|
|
-- E : Protected_Entry_Index)
|
|
-- is
|
|
-- <discriminant renamings>
|
|
-- <private object renamings>
|
|
-- type poVP is access poV;
|
|
-- _Object : ptVP := ptVP!(O);
|
|
|
|
-- begin
|
|
-- begin
|
|
-- <statement sequence>
|
|
-- Complete_Entry_Body (_Object._Object);
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Entry_Body (
|
|
-- _Object._Object, Get_GNAT_Exception);
|
|
-- end;
|
|
-- end entE;
|
|
|
|
-- The type poV is the record created for the protected type to hold
|
|
-- the state of the protected object.
|
|
|
|
procedure Expand_N_Protected_Body (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Pid : constant Entity_Id := Corresponding_Spec (N);
|
|
|
|
Lock_Free_Active : constant Boolean := Uses_Lock_Free (Pid);
|
|
-- This flag indicates whether the lock free implementation is active
|
|
|
|
Current_Node : Node_Id;
|
|
Disp_Op_Body : Node_Id;
|
|
New_Op_Body : Node_Id;
|
|
Op_Body : Node_Id;
|
|
Op_Id : Entity_Id;
|
|
|
|
function Build_Dispatching_Subprogram_Body
|
|
(N : Node_Id;
|
|
Pid : Node_Id;
|
|
Prot_Bod : Node_Id) return Node_Id;
|
|
-- Build a dispatching version of the protected subprogram body. The
|
|
-- newly generated subprogram contains a call to the original protected
|
|
-- body. The following code is generated:
|
|
--
|
|
-- function <protected-function-name> (Param1 .. ParamN) return
|
|
-- <return-type> is
|
|
-- begin
|
|
-- return <protected-function-name>P (Param1 .. ParamN);
|
|
-- end <protected-function-name>;
|
|
--
|
|
-- or
|
|
--
|
|
-- procedure <protected-procedure-name> (Param1 .. ParamN) is
|
|
-- begin
|
|
-- <protected-procedure-name>P (Param1 .. ParamN);
|
|
-- end <protected-procedure-name>
|
|
|
|
---------------------------------------
|
|
-- Build_Dispatching_Subprogram_Body --
|
|
---------------------------------------
|
|
|
|
function Build_Dispatching_Subprogram_Body
|
|
(N : Node_Id;
|
|
Pid : Node_Id;
|
|
Prot_Bod : Node_Id) return Node_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Actuals : List_Id;
|
|
Formal : Node_Id;
|
|
Spec : Node_Id;
|
|
Stmts : List_Id;
|
|
|
|
begin
|
|
-- Generate a specification without a letter suffix in order to
|
|
-- override an interface function or procedure.
|
|
|
|
Spec := Build_Protected_Sub_Specification (N, Pid, Dispatching_Mode);
|
|
|
|
-- The formal parameters become the actuals of the protected function
|
|
-- or procedure call.
|
|
|
|
Actuals := New_List;
|
|
Formal := First (Parameter_Specifications (Spec));
|
|
while Present (Formal) loop
|
|
Append_To (Actuals,
|
|
Make_Identifier (Loc, Chars (Defining_Identifier (Formal))));
|
|
Next (Formal);
|
|
end loop;
|
|
|
|
if Nkind (Spec) = N_Procedure_Specification then
|
|
Stmts :=
|
|
New_List (
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Corresponding_Spec (Prot_Bod), Loc),
|
|
Parameter_Associations => Actuals));
|
|
|
|
else
|
|
pragma Assert (Nkind (Spec) = N_Function_Specification);
|
|
|
|
Stmts :=
|
|
New_List (
|
|
Make_Simple_Return_Statement (Loc,
|
|
Expression =>
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Corresponding_Spec (Prot_Bod), Loc),
|
|
Parameter_Associations => Actuals)));
|
|
end if;
|
|
|
|
return
|
|
Make_Subprogram_Body (Loc,
|
|
Declarations => Empty_List,
|
|
Specification => Spec,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts));
|
|
end Build_Dispatching_Subprogram_Body;
|
|
|
|
-- Start of processing for Expand_N_Protected_Body
|
|
|
|
begin
|
|
if No_Run_Time_Mode then
|
|
Error_Msg_CRT ("protected body", N);
|
|
return;
|
|
end if;
|
|
|
|
-- This is the proper body corresponding to a stub. The declarations
|
|
-- must be inserted at the point of the stub, which in turn is in the
|
|
-- declarative part of the parent unit.
|
|
|
|
if Nkind (Parent (N)) = N_Subunit then
|
|
Current_Node := Corresponding_Stub (Parent (N));
|
|
else
|
|
Current_Node := N;
|
|
end if;
|
|
|
|
Op_Body := First (Declarations (N));
|
|
|
|
-- The protected body is replaced with the bodies of its
|
|
-- protected operations, and the declarations for internal objects
|
|
-- that may have been created for entry family bounds.
|
|
|
|
Rewrite (N, Make_Null_Statement (Sloc (N)));
|
|
Analyze (N);
|
|
|
|
while Present (Op_Body) loop
|
|
case Nkind (Op_Body) is
|
|
when N_Subprogram_Declaration =>
|
|
null;
|
|
|
|
when N_Subprogram_Body =>
|
|
|
|
-- Do not create bodies for eliminated operations
|
|
|
|
if not Is_Eliminated (Defining_Entity (Op_Body))
|
|
and then not Is_Eliminated (Corresponding_Spec (Op_Body))
|
|
then
|
|
if Lock_Free_Active then
|
|
New_Op_Body :=
|
|
Build_Lock_Free_Unprotected_Subprogram_Body
|
|
(Op_Body, Pid);
|
|
else
|
|
New_Op_Body :=
|
|
Build_Unprotected_Subprogram_Body (Op_Body, Pid);
|
|
end if;
|
|
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Current_Node := New_Op_Body;
|
|
Analyze (New_Op_Body);
|
|
|
|
-- Build the corresponding protected operation. It may
|
|
-- appear that this is needed only if this is a visible
|
|
-- operation of the type, or if it is an interrupt handler,
|
|
-- and this was the strategy used previously in GNAT.
|
|
|
|
-- However, the operation may be exported through a 'Access
|
|
-- to an external caller. This is the common idiom in code
|
|
-- that uses the Ada 2005 Timing_Events package. As a result
|
|
-- we need to produce the protected body for both visible
|
|
-- and private operations, as well as operations that only
|
|
-- have a body in the source, and for which we create a
|
|
-- declaration in the protected body itself.
|
|
|
|
if Present (Corresponding_Spec (Op_Body)) then
|
|
if Lock_Free_Active then
|
|
New_Op_Body :=
|
|
Build_Lock_Free_Protected_Subprogram_Body
|
|
(Op_Body, Pid, Specification (New_Op_Body));
|
|
else
|
|
New_Op_Body :=
|
|
Build_Protected_Subprogram_Body
|
|
(Op_Body, Pid, Specification (New_Op_Body));
|
|
end if;
|
|
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Analyze (New_Op_Body);
|
|
|
|
Current_Node := New_Op_Body;
|
|
|
|
-- Generate an overriding primitive operation body for
|
|
-- this subprogram if the protected type implements an
|
|
-- interface.
|
|
|
|
if Ada_Version >= Ada_2005
|
|
and then
|
|
Present (Interfaces (Corresponding_Record_Type (Pid)))
|
|
then
|
|
Disp_Op_Body :=
|
|
Build_Dispatching_Subprogram_Body
|
|
(Op_Body, Pid, New_Op_Body);
|
|
|
|
Insert_After (Current_Node, Disp_Op_Body);
|
|
Analyze (Disp_Op_Body);
|
|
|
|
Current_Node := Disp_Op_Body;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
when N_Entry_Body =>
|
|
Op_Id := Defining_Identifier (Op_Body);
|
|
New_Op_Body := Build_Protected_Entry (Op_Body, Op_Id, Pid);
|
|
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Current_Node := New_Op_Body;
|
|
Analyze (New_Op_Body);
|
|
|
|
when N_Implicit_Label_Declaration =>
|
|
null;
|
|
|
|
when N_Itype_Reference =>
|
|
Insert_After (Current_Node, New_Copy (Op_Body));
|
|
|
|
when N_Freeze_Entity =>
|
|
New_Op_Body := New_Copy (Op_Body);
|
|
|
|
if Present (Entity (Op_Body))
|
|
and then Freeze_Node (Entity (Op_Body)) = Op_Body
|
|
then
|
|
Set_Freeze_Node (Entity (Op_Body), New_Op_Body);
|
|
end if;
|
|
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Current_Node := New_Op_Body;
|
|
Analyze (New_Op_Body);
|
|
|
|
when N_Pragma =>
|
|
New_Op_Body := New_Copy (Op_Body);
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Current_Node := New_Op_Body;
|
|
Analyze (New_Op_Body);
|
|
|
|
when N_Object_Declaration =>
|
|
pragma Assert (not Comes_From_Source (Op_Body));
|
|
New_Op_Body := New_Copy (Op_Body);
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Current_Node := New_Op_Body;
|
|
Analyze (New_Op_Body);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
|
|
end case;
|
|
|
|
Next (Op_Body);
|
|
end loop;
|
|
|
|
-- Finally, create the body of the function that maps an entry index
|
|
-- into the corresponding body index, except when there is no entry, or
|
|
-- in a Ravenscar-like profile.
|
|
|
|
if Corresponding_Runtime_Package (Pid) =
|
|
System_Tasking_Protected_Objects_Entries
|
|
then
|
|
New_Op_Body := Build_Find_Body_Index (Pid);
|
|
Insert_After (Current_Node, New_Op_Body);
|
|
Current_Node := New_Op_Body;
|
|
Analyze (New_Op_Body);
|
|
end if;
|
|
|
|
-- Ada 2005 (AI-345): Construct the primitive wrapper bodies after the
|
|
-- protected body. At this point all wrapper specs have been created,
|
|
-- frozen and included in the dispatch table for the protected type.
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
Build_Wrapper_Bodies (Loc, Pid, Current_Node);
|
|
end if;
|
|
end Expand_N_Protected_Body;
|
|
|
|
-----------------------------------------
|
|
-- Expand_N_Protected_Type_Declaration --
|
|
-----------------------------------------
|
|
|
|
-- First we create a corresponding record type declaration used to
|
|
-- represent values of this protected type.
|
|
-- The general form of this type declaration is
|
|
|
|
-- type poV (discriminants) is record
|
|
-- _Object : aliased <kind>Protection
|
|
-- [(<entry count> [, <handler count>])];
|
|
-- [entry_family : array (bounds) of Void;]
|
|
-- <private data fields>
|
|
-- end record;
|
|
|
|
-- The discriminants are present only if the corresponding protected type
|
|
-- has discriminants, and they exactly mirror the protected type
|
|
-- discriminants. The private data fields similarly mirror the private
|
|
-- declarations of the protected type.
|
|
|
|
-- The Object field is always present. It contains RTS specific data used
|
|
-- to control the protected object. It is declared as Aliased so that it
|
|
-- can be passed as a pointer to the RTS. This allows the protected record
|
|
-- to be referenced within RTS data structures. An appropriate Protection
|
|
-- type and discriminant are generated.
|
|
|
|
-- The Service field is present for protected objects with entries. It
|
|
-- contains sufficient information to allow the entry service procedure for
|
|
-- this object to be called when the object is not known till runtime.
|
|
|
|
-- One entry_family component is present for each entry family in the
|
|
-- task definition (see Expand_N_Task_Type_Declaration).
|
|
|
|
-- When a protected object is declared, an instance of the protected type
|
|
-- value record is created. The elaboration of this declaration creates the
|
|
-- correct bounds for the entry families, and also evaluates the priority
|
|
-- expression if needed. The initialization routine for the protected type
|
|
-- itself then calls Initialize_Protection with appropriate parameters to
|
|
-- initialize the value of the Task_Id field. Install_Handlers may be also
|
|
-- called if a pragma Attach_Handler applies.
|
|
|
|
-- Note: this record is passed to the subprograms created by the expansion
|
|
-- of protected subprograms and entries. It is an in parameter to protected
|
|
-- functions and an in out parameter to procedures and entry bodies. The
|
|
-- Entity_Id for this created record type is placed in the
|
|
-- Corresponding_Record_Type field of the associated protected type entity.
|
|
|
|
-- Next we create a procedure specifications for protected subprograms and
|
|
-- entry bodies. For each protected subprograms two subprograms are
|
|
-- created, an unprotected and a protected version. The unprotected version
|
|
-- is called from within other operations of the same protected object.
|
|
|
|
-- We also build the call to register the procedure if a pragma
|
|
-- Interrupt_Handler applies.
|
|
|
|
-- A single subprogram is created to service all entry bodies; it has an
|
|
-- additional boolean out parameter indicating that the previous entry call
|
|
-- made by the current task was serviced immediately, i.e. not by proxy.
|
|
-- The O parameter contains a pointer to a record object of the type
|
|
-- described above. An untyped interface is used here to allow this
|
|
-- procedure to be called in places where the type of the object to be
|
|
-- serviced is not known. This must be done, for example, when a call that
|
|
-- may have been requeued is cancelled; the corresponding object must be
|
|
-- serviced, but which object that is not known till runtime.
|
|
|
|
-- procedure ptypeS
|
|
-- (O : System.Address; P : out Boolean);
|
|
-- procedure pprocN (_object : in out poV);
|
|
-- procedure pproc (_object : in out poV);
|
|
-- function pfuncN (_object : poV);
|
|
-- function pfunc (_object : poV);
|
|
-- ...
|
|
|
|
-- Note that this must come after the record type declaration, since
|
|
-- the specs refer to this type.
|
|
|
|
procedure Expand_N_Protected_Type_Declaration (N : Node_Id) is
|
|
Discr_Map : constant Elist_Id := New_Elmt_List;
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Prot_Typ : constant Entity_Id := Defining_Identifier (N);
|
|
|
|
Lock_Free_Active : constant Boolean := Uses_Lock_Free (Prot_Typ);
|
|
-- This flag indicates whether the lock free implementation is active
|
|
|
|
Pdef : constant Node_Id := Protected_Definition (N);
|
|
-- This contains two lists; one for visible and one for private decls
|
|
|
|
Body_Arr : Node_Id;
|
|
Body_Id : Entity_Id;
|
|
Cdecls : List_Id;
|
|
Comp : Node_Id;
|
|
Current_Node : Node_Id := N;
|
|
E_Count : Int;
|
|
Entries_Aggr : Node_Id;
|
|
New_Priv : Node_Id;
|
|
Object_Comp : Node_Id;
|
|
Priv : Node_Id;
|
|
Rec_Decl : Node_Id;
|
|
|
|
procedure Check_Inlining (Subp : Entity_Id);
|
|
-- If the original operation has a pragma Inline, propagate the flag
|
|
-- to the internal body, for possible inlining later on. The source
|
|
-- operation is invisible to the back-end and is never actually called.
|
|
|
|
function Discriminated_Size (Comp : Entity_Id) return Boolean;
|
|
-- If a component size is not static then a warning will be emitted
|
|
-- in Ravenscar or other restricted contexts. When a component is non-
|
|
-- static because of a discriminant constraint we can specialize the
|
|
-- warning by mentioning discriminants explicitly.
|
|
|
|
procedure Expand_Entry_Declaration (Decl : Node_Id);
|
|
-- Create the entry barrier and the procedure body for entry declaration
|
|
-- Decl. All generated subprograms are added to Entry_Bodies_Array.
|
|
|
|
function Static_Component_Size (Comp : Entity_Id) return Boolean;
|
|
-- When compiling under the Ravenscar profile, private components must
|
|
-- have a static size, or else a protected object will require heap
|
|
-- allocation, violating the corresponding restriction. It is preferable
|
|
-- to make this check here, because it provides a better error message
|
|
-- than the back-end, which refers to the object as a whole.
|
|
|
|
procedure Register_Handler;
|
|
-- For a protected operation that is an interrupt handler, add the
|
|
-- freeze action that will register it as such.
|
|
|
|
--------------------
|
|
-- Check_Inlining --
|
|
--------------------
|
|
|
|
procedure Check_Inlining (Subp : Entity_Id) is
|
|
begin
|
|
if Is_Inlined (Subp) then
|
|
Set_Is_Inlined (Protected_Body_Subprogram (Subp));
|
|
Set_Is_Inlined (Subp, False);
|
|
end if;
|
|
end Check_Inlining;
|
|
|
|
------------------------
|
|
-- Discriminated_Size --
|
|
------------------------
|
|
|
|
function Discriminated_Size (Comp : Entity_Id) return Boolean is
|
|
Typ : constant Entity_Id := Etype (Comp);
|
|
Index : Node_Id;
|
|
|
|
function Non_Static_Bound (Bound : Node_Id) return Boolean;
|
|
-- Check whether the bound of an index is non-static and does denote
|
|
-- a discriminant, in which case any protected object of the type
|
|
-- will have a non-static size.
|
|
|
|
----------------------
|
|
-- Non_Static_Bound --
|
|
----------------------
|
|
|
|
function Non_Static_Bound (Bound : Node_Id) return Boolean is
|
|
begin
|
|
if Is_OK_Static_Expression (Bound) then
|
|
return False;
|
|
|
|
elsif Is_Entity_Name (Bound)
|
|
and then Present (Discriminal_Link (Entity (Bound)))
|
|
then
|
|
return False;
|
|
|
|
else
|
|
return True;
|
|
end if;
|
|
end Non_Static_Bound;
|
|
|
|
-- Start of processing for Discriminated_Size
|
|
|
|
begin
|
|
if not Is_Array_Type (Typ) then
|
|
return False;
|
|
end if;
|
|
|
|
if Ekind (Typ) = E_Array_Subtype then
|
|
Index := First_Index (Typ);
|
|
while Present (Index) loop
|
|
if Non_Static_Bound (Low_Bound (Index))
|
|
or else Non_Static_Bound (High_Bound (Index))
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
Next_Index (Index);
|
|
end loop;
|
|
|
|
return True;
|
|
end if;
|
|
|
|
return False;
|
|
end Discriminated_Size;
|
|
|
|
---------------------------
|
|
-- Static_Component_Size --
|
|
---------------------------
|
|
|
|
function Static_Component_Size (Comp : Entity_Id) return Boolean is
|
|
Typ : constant Entity_Id := Etype (Comp);
|
|
C : Entity_Id;
|
|
|
|
begin
|
|
if Is_Scalar_Type (Typ) then
|
|
return True;
|
|
|
|
elsif Is_Array_Type (Typ) then
|
|
return Compile_Time_Known_Bounds (Typ);
|
|
|
|
elsif Is_Record_Type (Typ) then
|
|
C := First_Component (Typ);
|
|
while Present (C) loop
|
|
if not Static_Component_Size (C) then
|
|
return False;
|
|
end if;
|
|
|
|
Next_Component (C);
|
|
end loop;
|
|
|
|
return True;
|
|
|
|
-- Any other type will be checked by the back-end
|
|
|
|
else
|
|
return True;
|
|
end if;
|
|
end Static_Component_Size;
|
|
|
|
------------------------------
|
|
-- Expand_Entry_Declaration --
|
|
------------------------------
|
|
|
|
procedure Expand_Entry_Declaration (Decl : Node_Id) is
|
|
Ent_Id : constant Entity_Id := Defining_Entity (Decl);
|
|
Bar_Id : Entity_Id;
|
|
Bod_Id : Entity_Id;
|
|
Subp : Node_Id;
|
|
|
|
begin
|
|
E_Count := E_Count + 1;
|
|
|
|
-- Create the protected body subprogram
|
|
|
|
Bod_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => Build_Selected_Name (Prot_Typ, Ent_Id, 'E'));
|
|
Set_Protected_Body_Subprogram (Ent_Id, Bod_Id);
|
|
|
|
Subp :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Protected_Entry_Specification (Loc, Bod_Id, Ent_Id));
|
|
|
|
Insert_After (Current_Node, Subp);
|
|
Current_Node := Subp;
|
|
|
|
Analyze (Subp);
|
|
|
|
-- Build a wrapper procedure to handle contract cases, preconditions,
|
|
-- and postconditions.
|
|
|
|
Build_Contract_Wrapper (Ent_Id, N);
|
|
|
|
-- Create the barrier function
|
|
|
|
Bar_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => Build_Selected_Name (Prot_Typ, Ent_Id, 'B'));
|
|
Set_Barrier_Function (Ent_Id, Bar_Id);
|
|
|
|
Subp :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Barrier_Function_Specification (Loc, Bar_Id));
|
|
Set_Is_Entry_Barrier_Function (Subp);
|
|
|
|
Insert_After (Current_Node, Subp);
|
|
Current_Node := Subp;
|
|
|
|
Analyze (Subp);
|
|
|
|
Set_Protected_Body_Subprogram (Bar_Id, Bar_Id);
|
|
Set_Scope (Bar_Id, Scope (Ent_Id));
|
|
|
|
-- Collect pointers to the protected subprogram and the barrier
|
|
-- of the current entry, for insertion into Entry_Bodies_Array.
|
|
|
|
Append_To (Expressions (Entries_Aggr),
|
|
Make_Aggregate (Loc,
|
|
Expressions => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Bar_Id, Loc),
|
|
Attribute_Name => Name_Unrestricted_Access),
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Bod_Id, Loc),
|
|
Attribute_Name => Name_Unrestricted_Access))));
|
|
end Expand_Entry_Declaration;
|
|
|
|
----------------------
|
|
-- Register_Handler --
|
|
----------------------
|
|
|
|
procedure Register_Handler is
|
|
|
|
-- All semantic checks already done in Sem_Prag
|
|
|
|
Prot_Proc : constant Entity_Id :=
|
|
Defining_Unit_Name (Specification (Current_Node));
|
|
|
|
Proc_Address : constant Node_Id :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Prot_Proc, Loc),
|
|
Attribute_Name => Name_Address);
|
|
|
|
RTS_Call : constant Entity_Id :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Register_Interrupt_Handler), Loc),
|
|
Parameter_Associations => New_List (Proc_Address));
|
|
begin
|
|
Append_Freeze_Action (Prot_Proc, RTS_Call);
|
|
end Register_Handler;
|
|
|
|
-- Local variables
|
|
|
|
Sub : Node_Id;
|
|
|
|
-- Start of processing for Expand_N_Protected_Type_Declaration
|
|
|
|
begin
|
|
if Present (Corresponding_Record_Type (Prot_Typ)) then
|
|
return;
|
|
else
|
|
Rec_Decl := Build_Corresponding_Record (N, Prot_Typ, Loc);
|
|
end if;
|
|
|
|
Cdecls := Component_Items (Component_List (Type_Definition (Rec_Decl)));
|
|
|
|
Qualify_Entity_Names (N);
|
|
|
|
-- If the type has discriminants, their occurrences in the declaration
|
|
-- have been replaced by the corresponding discriminals. For components
|
|
-- that are constrained by discriminants, their homologues in the
|
|
-- corresponding record type must refer to the discriminants of that
|
|
-- record, so we must apply a new renaming to subtypes_indications:
|
|
|
|
-- protected discriminant => discriminal => record discriminant
|
|
|
|
-- This replacement is not applied to default expressions, for which
|
|
-- the discriminal is correct.
|
|
|
|
if Has_Discriminants (Prot_Typ) then
|
|
declare
|
|
Disc : Entity_Id;
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
Disc := First_Discriminant (Prot_Typ);
|
|
Decl := First (Discriminant_Specifications (Rec_Decl));
|
|
while Present (Disc) loop
|
|
Append_Elmt (Discriminal (Disc), Discr_Map);
|
|
Append_Elmt (Defining_Identifier (Decl), Discr_Map);
|
|
Next_Discriminant (Disc);
|
|
Next (Decl);
|
|
end loop;
|
|
end;
|
|
end if;
|
|
|
|
-- Fill in the component declarations
|
|
|
|
-- Add components for entry families. For each entry family, create an
|
|
-- anonymous type declaration with the same size, and analyze the type.
|
|
|
|
Collect_Entry_Families (Loc, Cdecls, Current_Node, Prot_Typ);
|
|
|
|
pragma Assert (Present (Pdef));
|
|
|
|
Insert_After (Current_Node, Rec_Decl);
|
|
Current_Node := Rec_Decl;
|
|
|
|
-- Add private field components
|
|
|
|
if Present (Private_Declarations (Pdef)) then
|
|
Priv := First (Private_Declarations (Pdef));
|
|
while Present (Priv) loop
|
|
if Nkind (Priv) = N_Component_Declaration then
|
|
if not Static_Component_Size (Defining_Identifier (Priv)) then
|
|
|
|
-- When compiling for a restricted profile, the private
|
|
-- components must have a static size. If not, this is an
|
|
-- error for a single protected declaration, and rates a
|
|
-- warning on a protected type declaration.
|
|
|
|
if not Comes_From_Source (Prot_Typ) then
|
|
|
|
-- It's ok to be checking this restriction at expansion
|
|
-- time, because this is only for the restricted profile,
|
|
-- which is not subject to strict RM conformance, so it
|
|
-- is OK to miss this check in -gnatc mode.
|
|
|
|
Check_Restriction (No_Implicit_Heap_Allocations, Priv);
|
|
Check_Restriction
|
|
(No_Implicit_Protected_Object_Allocations, Priv);
|
|
|
|
elsif Restriction_Active (No_Implicit_Heap_Allocations) then
|
|
if not Discriminated_Size (Defining_Identifier (Priv))
|
|
then
|
|
-- Any object of the type will be non-static.
|
|
|
|
Error_Msg_N ("component has non-static size??", Priv);
|
|
Error_Msg_NE
|
|
("\creation of protected object of type& will "
|
|
& "violate restriction "
|
|
& "No_Implicit_Heap_Allocations??", Priv, Prot_Typ);
|
|
else
|
|
|
|
-- Object will be non-static if discriminants are.
|
|
|
|
Error_Msg_NE
|
|
("creation of protected object of type& with "
|
|
& "non-static discriminants will violate"
|
|
& " restriction No_Implicit_Heap_Allocations??",
|
|
Priv, Prot_Typ);
|
|
end if;
|
|
|
|
-- Likewise for No_Implicit_Protected_Object_Allocations
|
|
|
|
elsif Restriction_Active
|
|
(No_Implicit_Protected_Object_Allocations)
|
|
then
|
|
if not Discriminated_Size (Defining_Identifier (Priv))
|
|
then
|
|
-- Any object of the type will be non-static.
|
|
|
|
Error_Msg_N ("component has non-static size??", Priv);
|
|
Error_Msg_NE
|
|
("\creation of protected object of type& will "
|
|
& "violate restriction "
|
|
& "No_Implicit_Protected_Object_Allocations??",
|
|
Priv, Prot_Typ);
|
|
else
|
|
-- Object will be non-static if discriminants are.
|
|
|
|
Error_Msg_NE
|
|
("creation of protected object of type& with "
|
|
& "non-static discriminants will violate "
|
|
& "restriction "
|
|
& "No_Implicit_Protected_Object_Allocations??",
|
|
Priv, Prot_Typ);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
-- The component definition consists of a subtype indication,
|
|
-- or (in Ada 2005) an access definition. Make a copy of the
|
|
-- proper definition.
|
|
|
|
declare
|
|
Old_Comp : constant Node_Id := Component_Definition (Priv);
|
|
Oent : constant Entity_Id := Defining_Identifier (Priv);
|
|
Nent : constant Entity_Id :=
|
|
Make_Defining_Identifier (Sloc (Oent),
|
|
Chars => Chars (Oent));
|
|
New_Comp : Node_Id;
|
|
|
|
begin
|
|
if Present (Subtype_Indication (Old_Comp)) then
|
|
New_Comp :=
|
|
Make_Component_Definition (Sloc (Oent),
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Copy_Tree
|
|
(Subtype_Indication (Old_Comp), Discr_Map));
|
|
else
|
|
New_Comp :=
|
|
Make_Component_Definition (Sloc (Oent),
|
|
Aliased_Present => False,
|
|
Access_Definition =>
|
|
New_Copy_Tree
|
|
(Access_Definition (Old_Comp), Discr_Map));
|
|
end if;
|
|
|
|
New_Priv :=
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier => Nent,
|
|
Component_Definition => New_Comp,
|
|
Expression => Expression (Priv));
|
|
|
|
Set_Has_Per_Object_Constraint (Nent,
|
|
Has_Per_Object_Constraint (Oent));
|
|
|
|
Append_To (Cdecls, New_Priv);
|
|
end;
|
|
|
|
elsif Nkind (Priv) = N_Subprogram_Declaration then
|
|
|
|
-- Make the unprotected version of the subprogram available
|
|
-- for expansion of intra object calls. There is need for
|
|
-- a protected version only if the subprogram is an interrupt
|
|
-- handler, otherwise this operation can only be called from
|
|
-- within the body.
|
|
|
|
Sub :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Protected_Sub_Specification
|
|
(Priv, Prot_Typ, Unprotected_Mode));
|
|
|
|
Insert_After (Current_Node, Sub);
|
|
Analyze (Sub);
|
|
|
|
Set_Protected_Body_Subprogram
|
|
(Defining_Unit_Name (Specification (Priv)),
|
|
Defining_Unit_Name (Specification (Sub)));
|
|
Check_Inlining (Defining_Unit_Name (Specification (Priv)));
|
|
Current_Node := Sub;
|
|
|
|
Sub :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Protected_Sub_Specification
|
|
(Priv, Prot_Typ, Protected_Mode));
|
|
|
|
Insert_After (Current_Node, Sub);
|
|
Analyze (Sub);
|
|
Current_Node := Sub;
|
|
|
|
if Is_Interrupt_Handler
|
|
(Defining_Unit_Name (Specification (Priv)))
|
|
then
|
|
if not Restricted_Profile then
|
|
Register_Handler;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
Next (Priv);
|
|
end loop;
|
|
end if;
|
|
|
|
-- Except for the lock-free implementation, append the _Object field
|
|
-- with the right type to the component list. We need to compute the
|
|
-- number of entries, and in some cases the number of Attach_Handler
|
|
-- pragmas.
|
|
|
|
if not Lock_Free_Active then
|
|
declare
|
|
Entry_Count_Expr : constant Node_Id :=
|
|
Build_Entry_Count_Expression
|
|
(Prot_Typ, Cdecls, Loc);
|
|
Num_Attach_Handler : Nat := 0;
|
|
Protection_Subtype : Node_Id;
|
|
Ritem : Node_Id;
|
|
|
|
begin
|
|
if Has_Attach_Handler (Prot_Typ) then
|
|
Ritem := First_Rep_Item (Prot_Typ);
|
|
while Present (Ritem) loop
|
|
if Nkind (Ritem) = N_Pragma
|
|
and then Pragma_Name (Ritem) = Name_Attach_Handler
|
|
then
|
|
Num_Attach_Handler := Num_Attach_Handler + 1;
|
|
end if;
|
|
|
|
Next_Rep_Item (Ritem);
|
|
end loop;
|
|
end if;
|
|
|
|
-- Determine the proper protection type. There are two special
|
|
-- cases: 1) when the protected type has dynamic interrupt
|
|
-- handlers, and 2) when it has static handlers and we use a
|
|
-- restricted profile.
|
|
|
|
if Has_Attach_Handler (Prot_Typ)
|
|
and then not Restricted_Profile
|
|
then
|
|
Protection_Subtype :=
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Static_Interrupt_Protection), Loc),
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints => New_List (
|
|
Entry_Count_Expr,
|
|
Make_Integer_Literal (Loc, Num_Attach_Handler))));
|
|
|
|
elsif Has_Interrupt_Handler (Prot_Typ)
|
|
and then not Restriction_Active (No_Dynamic_Attachment)
|
|
then
|
|
Protection_Subtype :=
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Dynamic_Interrupt_Protection), Loc),
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints => New_List (Entry_Count_Expr)));
|
|
|
|
else
|
|
case Corresponding_Runtime_Package (Prot_Typ) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Protection_Subtype :=
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Protection_Entries), Loc),
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints => New_List (Entry_Count_Expr)));
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Protection_Subtype :=
|
|
New_Occurrence_Of (RTE (RE_Protection_Entry), Loc);
|
|
|
|
when System_Tasking_Protected_Objects =>
|
|
Protection_Subtype :=
|
|
New_Occurrence_Of (RTE (RE_Protection), Loc);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
end if;
|
|
|
|
Object_Comp :=
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uObject),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => True,
|
|
Subtype_Indication => Protection_Subtype));
|
|
end;
|
|
|
|
-- Put the _Object component after the private component so that it
|
|
-- be finalized early as required by 9.4 (20)
|
|
|
|
Append_To (Cdecls, Object_Comp);
|
|
end if;
|
|
|
|
-- Analyze the record declaration immediately after construction,
|
|
-- because the initialization procedure is needed for single object
|
|
-- declarations before the next entity is analyzed (the freeze call
|
|
-- that generates this initialization procedure is found below).
|
|
|
|
Analyze (Rec_Decl, Suppress => All_Checks);
|
|
|
|
-- Ada 2005 (AI-345): Construct the primitive entry wrappers before
|
|
-- the corresponding record is frozen. If any wrappers are generated,
|
|
-- Current_Node is updated accordingly.
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
Build_Wrapper_Specs (Loc, Prot_Typ, Current_Node);
|
|
end if;
|
|
|
|
-- Collect pointers to entry bodies and their barriers, to be placed
|
|
-- in the Entry_Bodies_Array for the type. For each entry/family we
|
|
-- add an expression to the aggregate which is the initial value of
|
|
-- this array. The array is declared after all protected subprograms.
|
|
|
|
if Has_Entries (Prot_Typ) then
|
|
Entries_Aggr := Make_Aggregate (Loc, Expressions => New_List);
|
|
else
|
|
Entries_Aggr := Empty;
|
|
end if;
|
|
|
|
-- Build two new procedure specifications for each protected subprogram;
|
|
-- one to call from outside the object and one to call from inside.
|
|
-- Build a barrier function and an entry body action procedure
|
|
-- specification for each protected entry. Initialize the entry body
|
|
-- array. If subprogram is flagged as eliminated, do not generate any
|
|
-- internal operations.
|
|
|
|
E_Count := 0;
|
|
Comp := First (Visible_Declarations (Pdef));
|
|
while Present (Comp) loop
|
|
if Nkind (Comp) = N_Subprogram_Declaration then
|
|
Sub :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Protected_Sub_Specification
|
|
(Comp, Prot_Typ, Unprotected_Mode));
|
|
|
|
Insert_After (Current_Node, Sub);
|
|
Analyze (Sub);
|
|
|
|
Set_Protected_Body_Subprogram
|
|
(Defining_Unit_Name (Specification (Comp)),
|
|
Defining_Unit_Name (Specification (Sub)));
|
|
Check_Inlining (Defining_Unit_Name (Specification (Comp)));
|
|
|
|
-- Make the protected version of the subprogram available for
|
|
-- expansion of external calls.
|
|
|
|
Current_Node := Sub;
|
|
|
|
Sub :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Protected_Sub_Specification
|
|
(Comp, Prot_Typ, Protected_Mode));
|
|
|
|
Insert_After (Current_Node, Sub);
|
|
Analyze (Sub);
|
|
|
|
Current_Node := Sub;
|
|
|
|
-- Generate an overriding primitive operation specification for
|
|
-- this subprogram if the protected type implements an interface
|
|
-- and Build_Wrapper_Spec did not generate its wrapper.
|
|
|
|
if Ada_Version >= Ada_2005
|
|
and then
|
|
Present (Interfaces (Corresponding_Record_Type (Prot_Typ)))
|
|
then
|
|
declare
|
|
Found : Boolean := False;
|
|
Prim_Elmt : Elmt_Id;
|
|
Prim_Op : Node_Id;
|
|
|
|
begin
|
|
Prim_Elmt :=
|
|
First_Elmt
|
|
(Primitive_Operations
|
|
(Corresponding_Record_Type (Prot_Typ)));
|
|
|
|
while Present (Prim_Elmt) loop
|
|
Prim_Op := Node (Prim_Elmt);
|
|
|
|
if Is_Primitive_Wrapper (Prim_Op)
|
|
and then Wrapped_Entity (Prim_Op) =
|
|
Defining_Entity (Specification (Comp))
|
|
then
|
|
Found := True;
|
|
exit;
|
|
end if;
|
|
|
|
Next_Elmt (Prim_Elmt);
|
|
end loop;
|
|
|
|
if not Found then
|
|
Sub :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification =>
|
|
Build_Protected_Sub_Specification
|
|
(Comp, Prot_Typ, Dispatching_Mode));
|
|
|
|
Insert_After (Current_Node, Sub);
|
|
Analyze (Sub);
|
|
|
|
Current_Node := Sub;
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
-- If a pragma Interrupt_Handler applies, build and add a call to
|
|
-- Register_Interrupt_Handler to the freezing actions of the
|
|
-- protected version (Current_Node) of the subprogram:
|
|
|
|
-- system.interrupts.register_interrupt_handler
|
|
-- (prot_procP'address);
|
|
|
|
if not Restricted_Profile
|
|
and then Is_Interrupt_Handler
|
|
(Defining_Unit_Name (Specification (Comp)))
|
|
then
|
|
Register_Handler;
|
|
end if;
|
|
|
|
elsif Nkind (Comp) = N_Entry_Declaration then
|
|
Expand_Entry_Declaration (Comp);
|
|
end if;
|
|
|
|
Next (Comp);
|
|
end loop;
|
|
|
|
-- If there are some private entry declarations, expand it as if they
|
|
-- were visible entries.
|
|
|
|
if Present (Private_Declarations (Pdef)) then
|
|
Comp := First (Private_Declarations (Pdef));
|
|
while Present (Comp) loop
|
|
if Nkind (Comp) = N_Entry_Declaration then
|
|
Expand_Entry_Declaration (Comp);
|
|
end if;
|
|
|
|
Next (Comp);
|
|
end loop;
|
|
end if;
|
|
|
|
-- Emit declaration for Entry_Bodies_Array, now that the addresses of
|
|
-- all protected subprograms have been collected.
|
|
|
|
if Has_Entries (Prot_Typ) then
|
|
Body_Id :=
|
|
Make_Defining_Identifier (Sloc (Prot_Typ),
|
|
Chars => New_External_Name (Chars (Prot_Typ), 'A'));
|
|
|
|
case Corresponding_Runtime_Package (Prot_Typ) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Body_Arr :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Body_Id,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Protected_Entry_Body_Array), Loc),
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints => New_List (
|
|
Make_Range (Loc,
|
|
Make_Integer_Literal (Loc, 1),
|
|
Make_Integer_Literal (Loc, E_Count))))),
|
|
Expression => Entries_Aggr);
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Body_Arr :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Body_Id,
|
|
Aliased_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Entry_Body), Loc),
|
|
Expression =>
|
|
Remove_Head (Expressions (Entries_Aggr)));
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- A pointer to this array will be placed in the corresponding record
|
|
-- by its initialization procedure so this needs to be analyzed here.
|
|
|
|
Insert_After (Current_Node, Body_Arr);
|
|
Current_Node := Body_Arr;
|
|
Analyze (Body_Arr);
|
|
|
|
Set_Entry_Bodies_Array (Prot_Typ, Body_Id);
|
|
|
|
-- Finally, build the function that maps an entry index into the
|
|
-- corresponding body. A pointer to this function is placed in each
|
|
-- object of the type. Except for a ravenscar-like profile (no abort,
|
|
-- no entry queue, 1 entry)
|
|
|
|
if Corresponding_Runtime_Package (Prot_Typ) =
|
|
System_Tasking_Protected_Objects_Entries
|
|
then
|
|
Sub :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification => Build_Find_Body_Index_Spec (Prot_Typ));
|
|
Insert_After (Current_Node, Sub);
|
|
Analyze (Sub);
|
|
end if;
|
|
end if;
|
|
end Expand_N_Protected_Type_Declaration;
|
|
|
|
--------------------------------
|
|
-- Expand_N_Requeue_Statement --
|
|
--------------------------------
|
|
|
|
-- A nondispatching requeue statement is expanded into one of four GNARLI
|
|
-- operations, depending on the source and destination (task or protected
|
|
-- object). A dispatching requeue statement is expanded into a call to the
|
|
-- predefined primitive _Disp_Requeue. In addition, code is generated to
|
|
-- jump around the remainder of processing for the original entry and, if
|
|
-- the destination is (different) protected object, to attempt to service
|
|
-- it. The following illustrates the various cases:
|
|
|
|
-- procedure entE
|
|
-- (O : System.Address;
|
|
-- P : System.Address;
|
|
-- E : Protected_Entry_Index)
|
|
-- is
|
|
-- <discriminant renamings>
|
|
-- <private object renamings>
|
|
-- type poVP is access poV;
|
|
-- _object : ptVP := ptVP!(O);
|
|
|
|
-- begin
|
|
-- begin
|
|
-- <start of statement sequence for entry>
|
|
|
|
-- -- Requeue from one protected entry body to another protected
|
|
-- -- entry.
|
|
|
|
-- Requeue_Protected_Entry (
|
|
-- _object._object'Access,
|
|
-- new._object'Access,
|
|
-- E,
|
|
-- Abort_Present);
|
|
-- return;
|
|
|
|
-- <some more of the statement sequence for entry>
|
|
|
|
-- -- Requeue from an entry body to a task entry
|
|
|
|
-- Requeue_Protected_To_Task_Entry (
|
|
-- New._task_id,
|
|
-- E,
|
|
-- Abort_Present);
|
|
-- return;
|
|
|
|
-- <rest of statement sequence for entry>
|
|
-- Complete_Entry_Body (_object._object);
|
|
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Entry_Body (
|
|
-- _object._object, Get_GNAT_Exception);
|
|
-- end;
|
|
-- end entE;
|
|
|
|
-- Requeue of a task entry call to a task entry
|
|
|
|
-- Accept_Call (E, Ann);
|
|
-- <start of statement sequence for accept statement>
|
|
-- Requeue_Task_Entry (New._task_id, E, Abort_Present);
|
|
-- goto Lnn;
|
|
-- <rest of statement sequence for accept statement>
|
|
-- <<Lnn>>
|
|
-- Complete_Rendezvous;
|
|
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
|
|
|
|
-- Requeue of a task entry call to a protected entry
|
|
|
|
-- Accept_Call (E, Ann);
|
|
-- <start of statement sequence for accept statement>
|
|
-- Requeue_Task_To_Protected_Entry (
|
|
-- new._object'Access,
|
|
-- E,
|
|
-- Abort_Present);
|
|
-- newS (new, Pnn);
|
|
-- goto Lnn;
|
|
-- <rest of statement sequence for accept statement>
|
|
-- <<Lnn>>
|
|
-- Complete_Rendezvous;
|
|
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
|
|
|
|
-- Ada 2012 (AI05-0030): Dispatching requeue to an interface primitive
|
|
-- marked by pragma Implemented (XXX, By_Entry).
|
|
|
|
-- The requeue is inside a protected entry:
|
|
|
|
-- procedure entE
|
|
-- (O : System.Address;
|
|
-- P : System.Address;
|
|
-- E : Protected_Entry_Index)
|
|
-- is
|
|
-- <discriminant renamings>
|
|
-- <private object renamings>
|
|
-- type poVP is access poV;
|
|
-- _object : ptVP := ptVP!(O);
|
|
|
|
-- begin
|
|
-- begin
|
|
-- <start of statement sequence for entry>
|
|
|
|
-- _Disp_Requeue
|
|
-- (<interface class-wide object>,
|
|
-- True,
|
|
-- _object'Address,
|
|
-- Ada.Tags.Get_Offset_Index
|
|
-- (Tag (_object),
|
|
-- <interface dispatch table index of target entry>),
|
|
-- Abort_Present);
|
|
-- return;
|
|
|
|
-- <rest of statement sequence for entry>
|
|
-- Complete_Entry_Body (_object._object);
|
|
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Entry_Body (
|
|
-- _object._object, Get_GNAT_Exception);
|
|
-- end;
|
|
-- end entE;
|
|
|
|
-- The requeue is inside a task entry:
|
|
|
|
-- Accept_Call (E, Ann);
|
|
-- <start of statement sequence for accept statement>
|
|
-- _Disp_Requeue
|
|
-- (<interface class-wide object>,
|
|
-- False,
|
|
-- null,
|
|
-- Ada.Tags.Get_Offset_Index
|
|
-- (Tag (_object),
|
|
-- <interface dispatch table index of target entrt>),
|
|
-- Abort_Present);
|
|
-- newS (new, Pnn);
|
|
-- goto Lnn;
|
|
-- <rest of statement sequence for accept statement>
|
|
-- <<Lnn>>
|
|
-- Complete_Rendezvous;
|
|
|
|
-- exception
|
|
-- when all others =>
|
|
-- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
|
|
|
|
-- Ada 2012 (AI05-0030): Dispatching requeue to an interface primitive
|
|
-- marked by pragma Implemented (XXX, By_Protected_Procedure). The requeue
|
|
-- statement is replaced by a dispatching call with actual parameters taken
|
|
-- from the inner-most accept statement or entry body.
|
|
|
|
-- Target.Primitive (Param1, ..., ParamN);
|
|
|
|
-- Ada 2012 (AI05-0030): Dispatching requeue to an interface primitive
|
|
-- marked by pragma Implemented (XXX, By_Any | Optional) or not marked
|
|
-- at all.
|
|
|
|
-- declare
|
|
-- S : constant Offset_Index :=
|
|
-- Get_Offset_Index (Tag (Concval), DT_Position (Ename));
|
|
-- C : constant Prim_Op_Kind := Get_Prim_Op_Kind (Tag (Concval), S);
|
|
|
|
-- begin
|
|
-- if C = POK_Protected_Entry
|
|
-- or else C = POK_Task_Entry
|
|
-- then
|
|
-- <statements for dispatching requeue>
|
|
|
|
-- elsif C = POK_Protected_Procedure then
|
|
-- <dispatching call equivalent>
|
|
|
|
-- else
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
-- end;
|
|
|
|
procedure Expand_N_Requeue_Statement (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Conc_Typ : Entity_Id;
|
|
Concval : Node_Id;
|
|
Ename : Node_Id;
|
|
Index : Node_Id;
|
|
Old_Typ : Entity_Id;
|
|
|
|
function Build_Dispatching_Call_Equivalent return Node_Id;
|
|
-- Ada 2012 (AI05-0030): N denotes a dispatching requeue statement of
|
|
-- the form Concval.Ename. It is statically known that Ename is allowed
|
|
-- to be implemented by a protected procedure. Create a dispatching call
|
|
-- equivalent of Concval.Ename taking the actual parameters from the
|
|
-- inner-most accept statement or entry body.
|
|
|
|
function Build_Dispatching_Requeue return Node_Id;
|
|
-- Ada 2012 (AI05-0030): N denotes a dispatching requeue statement of
|
|
-- the form Concval.Ename. It is statically known that Ename is allowed
|
|
-- to be implemented by a protected or a task entry. Create a call to
|
|
-- primitive _Disp_Requeue which handles the low-level actions.
|
|
|
|
function Build_Dispatching_Requeue_To_Any return Node_Id;
|
|
-- Ada 2012 (AI05-0030): N denotes a dispatching requeue statement of
|
|
-- the form Concval.Ename. Ename is either marked by pragma Implemented
|
|
-- (XXX, By_Any | Optional) or not marked at all. Create a block which
|
|
-- determines at runtime whether Ename denotes an entry or a procedure
|
|
-- and perform the appropriate kind of dispatching select.
|
|
|
|
function Build_Normal_Requeue return Node_Id;
|
|
-- N denotes a nondispatching requeue statement to either a task or a
|
|
-- protected entry. Build the appropriate runtime call to perform the
|
|
-- action.
|
|
|
|
function Build_Skip_Statement (Search : Node_Id) return Node_Id;
|
|
-- For a protected entry, create a return statement to skip the rest of
|
|
-- the entry body. Otherwise, create a goto statement to skip the rest
|
|
-- of a task accept statement. The lookup for the enclosing entry body
|
|
-- or accept statement starts from Search.
|
|
|
|
---------------------------------------
|
|
-- Build_Dispatching_Call_Equivalent --
|
|
---------------------------------------
|
|
|
|
function Build_Dispatching_Call_Equivalent return Node_Id is
|
|
Call_Ent : constant Entity_Id := Entity (Ename);
|
|
Obj : constant Node_Id := Original_Node (Concval);
|
|
Acc_Ent : Node_Id;
|
|
Actuals : List_Id;
|
|
Formal : Node_Id;
|
|
Formals : List_Id;
|
|
|
|
begin
|
|
-- Climb the parent chain looking for the inner-most entry body or
|
|
-- accept statement.
|
|
|
|
Acc_Ent := N;
|
|
while Present (Acc_Ent)
|
|
and then not Nkind_In (Acc_Ent, N_Accept_Statement,
|
|
N_Entry_Body)
|
|
loop
|
|
Acc_Ent := Parent (Acc_Ent);
|
|
end loop;
|
|
|
|
-- A requeue statement should be housed inside an entry body or an
|
|
-- accept statement at some level. If this is not the case, then the
|
|
-- tree is malformed.
|
|
|
|
pragma Assert (Present (Acc_Ent));
|
|
|
|
-- Recover the list of formal parameters
|
|
|
|
if Nkind (Acc_Ent) = N_Entry_Body then
|
|
Acc_Ent := Entry_Body_Formal_Part (Acc_Ent);
|
|
end if;
|
|
|
|
Formals := Parameter_Specifications (Acc_Ent);
|
|
|
|
-- Create the actual parameters for the dispatching call. These are
|
|
-- simply copies of the entry body or accept statement formals in the
|
|
-- same order as they appear.
|
|
|
|
Actuals := No_List;
|
|
|
|
if Present (Formals) then
|
|
Actuals := New_List;
|
|
Formal := First (Formals);
|
|
while Present (Formal) loop
|
|
Append_To (Actuals,
|
|
Make_Identifier (Loc, Chars (Defining_Identifier (Formal))));
|
|
Next (Formal);
|
|
end loop;
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- Obj.Call_Ent (Actuals);
|
|
|
|
return
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Chars (Obj)),
|
|
Selector_Name => Make_Identifier (Loc, Chars (Call_Ent))),
|
|
|
|
Parameter_Associations => Actuals);
|
|
end Build_Dispatching_Call_Equivalent;
|
|
|
|
-------------------------------
|
|
-- Build_Dispatching_Requeue --
|
|
-------------------------------
|
|
|
|
function Build_Dispatching_Requeue return Node_Id is
|
|
Params : constant List_Id := New_List;
|
|
|
|
begin
|
|
-- Process the "with abort" parameter
|
|
|
|
Prepend_To (Params,
|
|
New_Occurrence_Of (Boolean_Literals (Abort_Present (N)), Loc));
|
|
|
|
-- Process the entry wrapper's position in the primary dispatch
|
|
-- table parameter. Generate:
|
|
|
|
-- Ada.Tags.Get_Entry_Index
|
|
-- (T => To_Tag_Ptr (Obj'Address).all,
|
|
-- Position =>
|
|
-- Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (Concval),
|
|
-- <interface dispatch table position of Ename>));
|
|
|
|
-- Note that Obj'Address is recursively expanded into a call to
|
|
-- Base_Address (Obj).
|
|
|
|
if Tagged_Type_Expansion then
|
|
Prepend_To (Params,
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Get_Entry_Index), Loc),
|
|
Parameter_Associations => New_List (
|
|
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Tag_Ptr),
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Copy_Tree (Concval),
|
|
Attribute_Name => Name_Address))),
|
|
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Get_Offset_Index), Loc),
|
|
Parameter_Associations => New_List (
|
|
Unchecked_Convert_To (RTE (RE_Tag), Concval),
|
|
Make_Integer_Literal (Loc,
|
|
DT_Position (Entity (Ename))))))));
|
|
|
|
-- VM targets
|
|
|
|
else
|
|
Prepend_To (Params,
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Get_Entry_Index), Loc),
|
|
Parameter_Associations => New_List (
|
|
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Concval,
|
|
Attribute_Name => Name_Tag),
|
|
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Get_Offset_Index), Loc),
|
|
|
|
Parameter_Associations => New_List (
|
|
|
|
-- Obj_Tag
|
|
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Concval,
|
|
Attribute_Name => Name_Tag),
|
|
|
|
-- Tag_Typ
|
|
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Etype (Concval), Loc),
|
|
Attribute_Name => Name_Tag),
|
|
|
|
-- Position
|
|
|
|
Make_Integer_Literal (Loc,
|
|
DT_Position (Entity (Ename))))))));
|
|
end if;
|
|
|
|
-- Specific actuals for protected to XXX requeue
|
|
|
|
if Is_Protected_Type (Old_Typ) then
|
|
Prepend_To (Params,
|
|
Make_Attribute_Reference (Loc, -- _object'Address
|
|
Prefix =>
|
|
Concurrent_Ref (New_Occurrence_Of (Old_Typ, Loc)),
|
|
Attribute_Name => Name_Address));
|
|
|
|
Prepend_To (Params, -- True
|
|
New_Occurrence_Of (Standard_True, Loc));
|
|
|
|
-- Specific actuals for task to XXX requeue
|
|
|
|
else
|
|
pragma Assert (Is_Task_Type (Old_Typ));
|
|
|
|
Prepend_To (Params, -- null
|
|
New_Occurrence_Of (RTE (RE_Null_Address), Loc));
|
|
|
|
Prepend_To (Params, -- False
|
|
New_Occurrence_Of (Standard_False, Loc));
|
|
end if;
|
|
|
|
-- Add the object parameter
|
|
|
|
Prepend_To (Params, New_Copy_Tree (Concval));
|
|
|
|
-- Generate:
|
|
-- _Disp_Requeue (<Params>);
|
|
|
|
-- Find entity for Disp_Requeue operation, which belongs to
|
|
-- the type and may not be directly visible.
|
|
|
|
declare
|
|
Elmt : Elmt_Id;
|
|
Op : Entity_Id;
|
|
|
|
begin
|
|
Elmt := First_Elmt (Primitive_Operations (Etype (Conc_Typ)));
|
|
while Present (Elmt) loop
|
|
Op := Node (Elmt);
|
|
exit when Chars (Op) = Name_uDisp_Requeue;
|
|
Next_Elmt (Elmt);
|
|
end loop;
|
|
|
|
return
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (Op, Loc),
|
|
Parameter_Associations => Params);
|
|
end;
|
|
end Build_Dispatching_Requeue;
|
|
|
|
--------------------------------------
|
|
-- Build_Dispatching_Requeue_To_Any --
|
|
--------------------------------------
|
|
|
|
function Build_Dispatching_Requeue_To_Any return Node_Id is
|
|
Call_Ent : constant Entity_Id := Entity (Ename);
|
|
Obj : constant Node_Id := Original_Node (Concval);
|
|
Skip : constant Node_Id := Build_Skip_Statement (N);
|
|
C : Entity_Id;
|
|
Decls : List_Id;
|
|
S : Entity_Id;
|
|
Stmts : List_Id;
|
|
|
|
begin
|
|
Decls := New_List;
|
|
Stmts := New_List;
|
|
|
|
-- Dispatch table slot processing, generate:
|
|
-- S : Integer;
|
|
|
|
S := Build_S (Loc, Decls);
|
|
|
|
-- Call kind processing, generate:
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
|
|
C := Build_C (Loc, Decls);
|
|
|
|
-- Generate:
|
|
-- S := Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (Obj), DT_Position (Call_Ent));
|
|
|
|
Append_To (Stmts, Build_S_Assignment (Loc, S, Obj, Call_Ent));
|
|
|
|
-- Generate:
|
|
-- _Disp_Get_Prim_Op_Kind (Obj, S, C);
|
|
|
|
Append_To (Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (
|
|
Find_Prim_Op (Etype (Etype (Obj)),
|
|
Name_uDisp_Get_Prim_Op_Kind),
|
|
Loc),
|
|
Parameter_Associations => New_List (
|
|
New_Copy_Tree (Obj),
|
|
New_Occurrence_Of (S, Loc),
|
|
New_Occurrence_Of (C, Loc))));
|
|
|
|
Append_To (Stmts,
|
|
|
|
-- if C = POK_Protected_Entry
|
|
-- or else C = POK_Task_Entry
|
|
-- then
|
|
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Op_Or (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Protected_Entry), Loc)),
|
|
|
|
Right_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Task_Entry), Loc))),
|
|
|
|
-- Dispatching requeue equivalent
|
|
|
|
Then_Statements => New_List (
|
|
Build_Dispatching_Requeue,
|
|
Skip),
|
|
|
|
-- elsif C = POK_Protected_Procedure then
|
|
|
|
Elsif_Parts => New_List (
|
|
Make_Elsif_Part (Loc,
|
|
Condition =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd =>
|
|
New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (
|
|
RTE (RE_POK_Protected_Procedure), Loc)),
|
|
|
|
-- Dispatching call equivalent
|
|
|
|
Then_Statements => New_List (
|
|
Build_Dispatching_Call_Equivalent))),
|
|
|
|
-- else
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
|
|
Else_Statements => New_List (
|
|
Make_Raise_Program_Error (Loc,
|
|
Reason => PE_Explicit_Raise))));
|
|
|
|
-- Wrap everything into a block
|
|
|
|
return
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Stmts));
|
|
end Build_Dispatching_Requeue_To_Any;
|
|
|
|
--------------------------
|
|
-- Build_Normal_Requeue --
|
|
--------------------------
|
|
|
|
function Build_Normal_Requeue return Node_Id is
|
|
Params : constant List_Id := New_List;
|
|
Param : Node_Id;
|
|
RT_Call : Node_Id;
|
|
|
|
begin
|
|
-- Process the "with abort" parameter
|
|
|
|
Prepend_To (Params,
|
|
New_Occurrence_Of (Boolean_Literals (Abort_Present (N)), Loc));
|
|
|
|
-- Add the index expression to the parameters. It is common among all
|
|
-- four cases.
|
|
|
|
Prepend_To (Params,
|
|
Entry_Index_Expression (Loc, Entity (Ename), Index, Conc_Typ));
|
|
|
|
if Is_Protected_Type (Old_Typ) then
|
|
declare
|
|
Self_Param : Node_Id;
|
|
|
|
begin
|
|
Self_Param :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Concurrent_Ref (New_Occurrence_Of (Old_Typ, Loc)),
|
|
Attribute_Name =>
|
|
Name_Unchecked_Access);
|
|
|
|
-- Protected to protected requeue
|
|
|
|
if Is_Protected_Type (Conc_Typ) then
|
|
RT_Call :=
|
|
New_Occurrence_Of (
|
|
RTE (RE_Requeue_Protected_Entry), Loc);
|
|
|
|
Param :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Concurrent_Ref (Concval),
|
|
Attribute_Name =>
|
|
Name_Unchecked_Access);
|
|
|
|
-- Protected to task requeue
|
|
|
|
else pragma Assert (Is_Task_Type (Conc_Typ));
|
|
RT_Call :=
|
|
New_Occurrence_Of (
|
|
RTE (RE_Requeue_Protected_To_Task_Entry), Loc);
|
|
|
|
Param := Concurrent_Ref (Concval);
|
|
end if;
|
|
|
|
Prepend_To (Params, Param);
|
|
Prepend_To (Params, Self_Param);
|
|
end;
|
|
|
|
else pragma Assert (Is_Task_Type (Old_Typ));
|
|
|
|
-- Task to protected requeue
|
|
|
|
if Is_Protected_Type (Conc_Typ) then
|
|
RT_Call :=
|
|
New_Occurrence_Of (
|
|
RTE (RE_Requeue_Task_To_Protected_Entry), Loc);
|
|
|
|
Param :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Concurrent_Ref (Concval),
|
|
Attribute_Name =>
|
|
Name_Unchecked_Access);
|
|
|
|
-- Task to task requeue
|
|
|
|
else pragma Assert (Is_Task_Type (Conc_Typ));
|
|
RT_Call :=
|
|
New_Occurrence_Of (RTE (RE_Requeue_Task_Entry), Loc);
|
|
|
|
Param := Concurrent_Ref (Concval);
|
|
end if;
|
|
|
|
Prepend_To (Params, Param);
|
|
end if;
|
|
|
|
return
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => RT_Call,
|
|
Parameter_Associations => Params);
|
|
end Build_Normal_Requeue;
|
|
|
|
--------------------------
|
|
-- Build_Skip_Statement --
|
|
--------------------------
|
|
|
|
function Build_Skip_Statement (Search : Node_Id) return Node_Id is
|
|
Skip_Stmt : Node_Id;
|
|
|
|
begin
|
|
-- Build a return statement to skip the rest of the entire body
|
|
|
|
if Is_Protected_Type (Old_Typ) then
|
|
Skip_Stmt := Make_Simple_Return_Statement (Loc);
|
|
|
|
-- If the requeue is within a task, find the end label of the
|
|
-- enclosing accept statement and create a goto statement to it.
|
|
|
|
else
|
|
declare
|
|
Acc : Node_Id;
|
|
Label : Node_Id;
|
|
|
|
begin
|
|
-- Climb the parent chain looking for the enclosing accept
|
|
-- statement.
|
|
|
|
Acc := Parent (Search);
|
|
while Present (Acc)
|
|
and then Nkind (Acc) /= N_Accept_Statement
|
|
loop
|
|
Acc := Parent (Acc);
|
|
end loop;
|
|
|
|
-- The last statement is the second label used for completing
|
|
-- the rendezvous the usual way. The label we are looking for
|
|
-- is right before it.
|
|
|
|
Label :=
|
|
Prev (Last (Statements (Handled_Statement_Sequence (Acc))));
|
|
|
|
pragma Assert (Nkind (Label) = N_Label);
|
|
|
|
-- Generate a goto statement to skip the rest of the accept
|
|
|
|
Skip_Stmt :=
|
|
Make_Goto_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (Entity (Identifier (Label)), Loc));
|
|
end;
|
|
end if;
|
|
|
|
Set_Analyzed (Skip_Stmt);
|
|
|
|
return Skip_Stmt;
|
|
end Build_Skip_Statement;
|
|
|
|
-- Start of processing for Expand_N_Requeue_Statement
|
|
|
|
begin
|
|
-- Extract the components of the entry call
|
|
|
|
Extract_Entry (N, Concval, Ename, Index);
|
|
Conc_Typ := Etype (Concval);
|
|
|
|
-- If the prefix is an access to class-wide type, dereference to get
|
|
-- object and entry type.
|
|
|
|
if Is_Access_Type (Conc_Typ) then
|
|
Conc_Typ := Designated_Type (Conc_Typ);
|
|
Rewrite (Concval,
|
|
Make_Explicit_Dereference (Loc, Relocate_Node (Concval)));
|
|
Analyze_And_Resolve (Concval, Conc_Typ);
|
|
end if;
|
|
|
|
-- Examine the scope stack in order to find nearest enclosing protected
|
|
-- or task type. This will constitute our invocation source.
|
|
|
|
Old_Typ := Current_Scope;
|
|
while Present (Old_Typ)
|
|
and then not Is_Protected_Type (Old_Typ)
|
|
and then not Is_Task_Type (Old_Typ)
|
|
loop
|
|
Old_Typ := Scope (Old_Typ);
|
|
end loop;
|
|
|
|
-- Ada 2012 (AI05-0030): We have a dispatching requeue of the form
|
|
-- Concval.Ename where the type of Concval is class-wide concurrent
|
|
-- interface.
|
|
|
|
if Ada_Version >= Ada_2012
|
|
and then Present (Concval)
|
|
and then Is_Class_Wide_Type (Conc_Typ)
|
|
and then Is_Concurrent_Interface (Conc_Typ)
|
|
then
|
|
declare
|
|
Has_Impl : Boolean := False;
|
|
Impl_Kind : Name_Id := No_Name;
|
|
|
|
begin
|
|
-- Check whether the Ename is flagged by pragma Implemented
|
|
|
|
if Has_Rep_Pragma (Entity (Ename), Name_Implemented) then
|
|
Has_Impl := True;
|
|
Impl_Kind := Implementation_Kind (Entity (Ename));
|
|
end if;
|
|
|
|
-- The procedure_or_entry_NAME is guaranteed to be overridden by
|
|
-- an entry. Create a call to predefined primitive _Disp_Requeue.
|
|
|
|
if Has_Impl and then Impl_Kind = Name_By_Entry then
|
|
Rewrite (N, Build_Dispatching_Requeue);
|
|
Analyze (N);
|
|
Insert_After (N, Build_Skip_Statement (N));
|
|
|
|
-- The procedure_or_entry_NAME is guaranteed to be overridden by
|
|
-- a protected procedure. In this case the requeue is transformed
|
|
-- into a dispatching call.
|
|
|
|
elsif Has_Impl
|
|
and then Impl_Kind = Name_By_Protected_Procedure
|
|
then
|
|
Rewrite (N, Build_Dispatching_Call_Equivalent);
|
|
Analyze (N);
|
|
|
|
-- The procedure_or_entry_NAME's implementation kind is either
|
|
-- By_Any, Optional, or pragma Implemented was not applied at all.
|
|
-- In this case a runtime test determines whether Ename denotes an
|
|
-- entry or a protected procedure and performs the appropriate
|
|
-- call.
|
|
|
|
else
|
|
Rewrite (N, Build_Dispatching_Requeue_To_Any);
|
|
Analyze (N);
|
|
end if;
|
|
end;
|
|
|
|
-- Processing for regular (nondispatching) requeues
|
|
|
|
else
|
|
Rewrite (N, Build_Normal_Requeue);
|
|
Analyze (N);
|
|
Insert_After (N, Build_Skip_Statement (N));
|
|
end if;
|
|
end Expand_N_Requeue_Statement;
|
|
|
|
-------------------------------
|
|
-- Expand_N_Selective_Accept --
|
|
-------------------------------
|
|
|
|
procedure Expand_N_Selective_Accept (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Alts : constant List_Id := Select_Alternatives (N);
|
|
|
|
-- Note: in the below declarations a lot of new lists are allocated
|
|
-- unconditionally which may well not end up being used. That's not
|
|
-- a good idea since it wastes space gratuitously ???
|
|
|
|
Accept_Case : List_Id;
|
|
Accept_List : constant List_Id := New_List;
|
|
|
|
Alt : Node_Id;
|
|
Alt_List : constant List_Id := New_List;
|
|
Alt_Stats : List_Id;
|
|
Ann : Entity_Id := Empty;
|
|
|
|
Check_Guard : Boolean := True;
|
|
|
|
Decls : constant List_Id := New_List;
|
|
Stats : constant List_Id := New_List;
|
|
Body_List : constant List_Id := New_List;
|
|
Trailing_List : constant List_Id := New_List;
|
|
|
|
Choices : List_Id;
|
|
Else_Present : Boolean := False;
|
|
Terminate_Alt : Node_Id := Empty;
|
|
Select_Mode : Node_Id;
|
|
|
|
Delay_Case : List_Id;
|
|
Delay_Count : Integer := 0;
|
|
Delay_Val : Entity_Id;
|
|
Delay_Index : Entity_Id;
|
|
Delay_Min : Entity_Id;
|
|
Delay_Num : Pos := 1;
|
|
Delay_Alt_List : List_Id := New_List;
|
|
Delay_List : constant List_Id := New_List;
|
|
D : Entity_Id;
|
|
M : Entity_Id;
|
|
|
|
First_Delay : Boolean := True;
|
|
Guard_Open : Entity_Id;
|
|
|
|
End_Lab : Node_Id;
|
|
Index : Pos := 1;
|
|
Lab : Node_Id;
|
|
Num_Alts : Nat;
|
|
Num_Accept : Nat := 0;
|
|
Proc : Node_Id;
|
|
Time_Type : Entity_Id;
|
|
Select_Call : Node_Id;
|
|
|
|
Qnam : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, New_External_Name ('S', 0));
|
|
|
|
Xnam : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, New_External_Name ('J', 1));
|
|
|
|
-----------------------
|
|
-- Local subprograms --
|
|
-----------------------
|
|
|
|
function Accept_Or_Raise return List_Id;
|
|
-- For the rare case where delay alternatives all have guards, and
|
|
-- all of them are closed, it is still possible that there were open
|
|
-- accept alternatives with no callers. We must reexamine the
|
|
-- Accept_List, and execute a selective wait with no else if some
|
|
-- accept is open. If none, we raise program_error.
|
|
|
|
procedure Add_Accept (Alt : Node_Id);
|
|
-- Process a single accept statement in a select alternative. Build
|
|
-- procedure for body of accept, and add entry to dispatch table with
|
|
-- expression for guard, in preparation for call to run time select.
|
|
|
|
function Make_And_Declare_Label (Num : Int) return Node_Id;
|
|
-- Manufacture a label using Num as a serial number and declare it.
|
|
-- The declaration is appended to Decls. The label marks the trailing
|
|
-- statements of an accept or delay alternative.
|
|
|
|
function Make_Select_Call (Select_Mode : Entity_Id) return Node_Id;
|
|
-- Build call to Selective_Wait runtime routine
|
|
|
|
procedure Process_Delay_Alternative (Alt : Node_Id; Index : Int);
|
|
-- Add code to compare value of delay with previous values, and
|
|
-- generate case entry for trailing statements.
|
|
|
|
procedure Process_Accept_Alternative
|
|
(Alt : Node_Id;
|
|
Index : Int;
|
|
Proc : Node_Id);
|
|
-- Add code to call corresponding procedure, and branch to
|
|
-- trailing statements, if any.
|
|
|
|
---------------------
|
|
-- Accept_Or_Raise --
|
|
---------------------
|
|
|
|
function Accept_Or_Raise return List_Id is
|
|
Cond : Node_Id;
|
|
Stats : List_Id;
|
|
J : constant Entity_Id := Make_Temporary (Loc, 'J');
|
|
|
|
begin
|
|
-- We generate the following:
|
|
|
|
-- for J in q'range loop
|
|
-- if q(J).S /=null_task_entry then
|
|
-- selective_wait (simple_mode,...);
|
|
-- done := True;
|
|
-- exit;
|
|
-- end if;
|
|
-- end loop;
|
|
--
|
|
-- if no rendez_vous then
|
|
-- raise program_error;
|
|
-- end if;
|
|
|
|
-- Note that the code needs to know that the selector name
|
|
-- in an Accept_Alternative is named S.
|
|
|
|
Cond := Make_Op_Ne (Loc,
|
|
Left_Opnd =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Make_Indexed_Component (Loc,
|
|
Prefix => New_Occurrence_Of (Qnam, Loc),
|
|
Expressions => New_List (New_Occurrence_Of (J, Loc))),
|
|
Selector_Name => Make_Identifier (Loc, Name_S)),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_Null_Task_Entry), Loc));
|
|
|
|
Stats := New_List (
|
|
Make_Implicit_Loop_Statement (N,
|
|
Iteration_Scheme =>
|
|
Make_Iteration_Scheme (Loc,
|
|
Loop_Parameter_Specification =>
|
|
Make_Loop_Parameter_Specification (Loc,
|
|
Defining_Identifier => J,
|
|
Discrete_Subtype_Definition =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Qnam, Loc),
|
|
Attribute_Name => Name_Range,
|
|
Expressions => New_List (
|
|
Make_Integer_Literal (Loc, 1))))),
|
|
|
|
Statements => New_List (
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Cond,
|
|
Then_Statements => New_List (
|
|
Make_Select_Call (
|
|
New_Occurrence_Of (RTE (RE_Simple_Mode), Loc)),
|
|
Make_Exit_Statement (Loc))))));
|
|
|
|
Append_To (Stats,
|
|
Make_Raise_Program_Error (Loc,
|
|
Condition => Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (Xnam, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_No_Rendezvous), Loc)),
|
|
Reason => PE_All_Guards_Closed));
|
|
|
|
return Stats;
|
|
end Accept_Or_Raise;
|
|
|
|
----------------
|
|
-- Add_Accept --
|
|
----------------
|
|
|
|
procedure Add_Accept (Alt : Node_Id) is
|
|
Acc_Stm : constant Node_Id := Accept_Statement (Alt);
|
|
Ename : constant Node_Id := Entry_Direct_Name (Acc_Stm);
|
|
Eloc : constant Source_Ptr := Sloc (Ename);
|
|
Eent : constant Entity_Id := Entity (Ename);
|
|
Index : constant Node_Id := Entry_Index (Acc_Stm);
|
|
Null_Body : Node_Id;
|
|
Proc_Body : Node_Id;
|
|
PB_Ent : Entity_Id;
|
|
Expr : Node_Id;
|
|
Call : Node_Id;
|
|
|
|
begin
|
|
if No (Ann) then
|
|
Ann := Node (Last_Elmt (Accept_Address (Eent)));
|
|
end if;
|
|
|
|
if Present (Condition (Alt)) then
|
|
Expr :=
|
|
Make_If_Expression (Eloc, New_List (
|
|
Condition (Alt),
|
|
Entry_Index_Expression (Eloc, Eent, Index, Scope (Eent)),
|
|
New_Occurrence_Of (RTE (RE_Null_Task_Entry), Eloc)));
|
|
else
|
|
Expr :=
|
|
Entry_Index_Expression
|
|
(Eloc, Eent, Index, Scope (Eent));
|
|
end if;
|
|
|
|
if Present (Handled_Statement_Sequence (Accept_Statement (Alt))) then
|
|
Null_Body := New_Occurrence_Of (Standard_False, Eloc);
|
|
|
|
-- Always add call to Abort_Undefer when generating code, since
|
|
-- this is what the runtime expects (abort deferred in
|
|
-- Selective_Wait). In CodePeer mode this only confuses the
|
|
-- analysis with unknown calls, so don't do it.
|
|
|
|
if not CodePeer_Mode then
|
|
Call := Build_Runtime_Call (Loc, RE_Abort_Undefer);
|
|
Insert_Before
|
|
(First (Statements (Handled_Statement_Sequence
|
|
(Accept_Statement (Alt)))),
|
|
Call);
|
|
Analyze (Call);
|
|
end if;
|
|
|
|
PB_Ent :=
|
|
Make_Defining_Identifier (Eloc,
|
|
New_External_Name (Chars (Ename), 'A', Num_Accept));
|
|
|
|
if Comes_From_Source (Alt) then
|
|
Set_Debug_Info_Needed (PB_Ent);
|
|
end if;
|
|
|
|
Proc_Body :=
|
|
Make_Subprogram_Body (Eloc,
|
|
Specification =>
|
|
Make_Procedure_Specification (Eloc,
|
|
Defining_Unit_Name => PB_Ent),
|
|
Declarations => Declarations (Acc_Stm),
|
|
Handled_Statement_Sequence =>
|
|
Build_Accept_Body (Accept_Statement (Alt)));
|
|
|
|
-- During the analysis of the body of the accept statement, any
|
|
-- zero cost exception handler records were collected in the
|
|
-- Accept_Handler_Records field of the N_Accept_Alternative node.
|
|
-- This is where we move them to where they belong, namely the
|
|
-- newly created procedure.
|
|
|
|
Set_Handler_Records (PB_Ent, Accept_Handler_Records (Alt));
|
|
Append (Proc_Body, Body_List);
|
|
|
|
else
|
|
Null_Body := New_Occurrence_Of (Standard_True, Eloc);
|
|
|
|
-- if accept statement has declarations, insert above, given that
|
|
-- we are not creating a body for the accept.
|
|
|
|
if Present (Declarations (Acc_Stm)) then
|
|
Insert_Actions (N, Declarations (Acc_Stm));
|
|
end if;
|
|
end if;
|
|
|
|
Append_To (Accept_List,
|
|
Make_Aggregate (Eloc, Expressions => New_List (Null_Body, Expr)));
|
|
|
|
Num_Accept := Num_Accept + 1;
|
|
end Add_Accept;
|
|
|
|
----------------------------
|
|
-- Make_And_Declare_Label --
|
|
----------------------------
|
|
|
|
function Make_And_Declare_Label (Num : Int) return Node_Id is
|
|
Lab_Id : Node_Id;
|
|
|
|
begin
|
|
Lab_Id := Make_Identifier (Loc, New_External_Name ('L', Num));
|
|
Lab :=
|
|
Make_Label (Loc, Lab_Id);
|
|
|
|
Append_To (Decls,
|
|
Make_Implicit_Label_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Chars (Lab_Id)),
|
|
Label_Construct => Lab));
|
|
|
|
return Lab;
|
|
end Make_And_Declare_Label;
|
|
|
|
----------------------
|
|
-- Make_Select_Call --
|
|
----------------------
|
|
|
|
function Make_Select_Call (Select_Mode : Entity_Id) return Node_Id is
|
|
Params : constant List_Id := New_List;
|
|
|
|
begin
|
|
Append_To (Params,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Qnam, Loc),
|
|
Attribute_Name => Name_Unchecked_Access));
|
|
Append_To (Params, Select_Mode);
|
|
Append_To (Params, New_Occurrence_Of (Ann, Loc));
|
|
Append_To (Params, New_Occurrence_Of (Xnam, Loc));
|
|
|
|
return
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Selective_Wait), Loc),
|
|
Parameter_Associations => Params);
|
|
end Make_Select_Call;
|
|
|
|
--------------------------------
|
|
-- Process_Accept_Alternative --
|
|
--------------------------------
|
|
|
|
procedure Process_Accept_Alternative
|
|
(Alt : Node_Id;
|
|
Index : Int;
|
|
Proc : Node_Id)
|
|
is
|
|
Astmt : constant Node_Id := Accept_Statement (Alt);
|
|
Alt_Stats : List_Id;
|
|
|
|
begin
|
|
Adjust_Condition (Condition (Alt));
|
|
|
|
-- Accept with body
|
|
|
|
if Present (Handled_Statement_Sequence (Astmt)) then
|
|
Alt_Stats :=
|
|
New_List (
|
|
Make_Procedure_Call_Statement (Sloc (Proc),
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(Defining_Unit_Name (Specification (Proc)),
|
|
Sloc (Proc))));
|
|
|
|
-- Accept with no body (followed by trailing statements)
|
|
|
|
else
|
|
Alt_Stats := Empty_List;
|
|
end if;
|
|
|
|
Ensure_Statement_Present (Sloc (Astmt), Alt);
|
|
|
|
-- After the call, if any, branch to trailing statements, if any.
|
|
-- We create a label for each, as well as the corresponding label
|
|
-- declaration.
|
|
|
|
if not Is_Empty_List (Statements (Alt)) then
|
|
Lab := Make_And_Declare_Label (Index);
|
|
Append (Lab, Trailing_List);
|
|
Append_List (Statements (Alt), Trailing_List);
|
|
Append_To (Trailing_List,
|
|
Make_Goto_Statement (Loc,
|
|
Name => New_Copy (Identifier (End_Lab))));
|
|
|
|
else
|
|
Lab := End_Lab;
|
|
end if;
|
|
|
|
Append_To (Alt_Stats,
|
|
Make_Goto_Statement (Loc, Name => New_Copy (Identifier (Lab))));
|
|
|
|
Append_To (Alt_List,
|
|
Make_Case_Statement_Alternative (Loc,
|
|
Discrete_Choices => New_List (Make_Integer_Literal (Loc, Index)),
|
|
Statements => Alt_Stats));
|
|
end Process_Accept_Alternative;
|
|
|
|
-------------------------------
|
|
-- Process_Delay_Alternative --
|
|
-------------------------------
|
|
|
|
procedure Process_Delay_Alternative (Alt : Node_Id; Index : Int) is
|
|
Dloc : constant Source_Ptr := Sloc (Delay_Statement (Alt));
|
|
Cond : Node_Id;
|
|
Delay_Alt : List_Id;
|
|
|
|
begin
|
|
-- Deal with C/Fortran boolean as delay condition
|
|
|
|
Adjust_Condition (Condition (Alt));
|
|
|
|
-- Determine the smallest specified delay
|
|
|
|
-- for each delay alternative generate:
|
|
|
|
-- if guard-expression then
|
|
-- Delay_Val := delay-expression;
|
|
-- Guard_Open := True;
|
|
-- if Delay_Val < Delay_Min then
|
|
-- Delay_Min := Delay_Val;
|
|
-- Delay_Index := Index;
|
|
-- end if;
|
|
-- end if;
|
|
|
|
-- The enclosing if-statement is omitted if there is no guard
|
|
|
|
if Delay_Count = 1 or else First_Delay then
|
|
First_Delay := False;
|
|
|
|
Delay_Alt := New_List (
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Delay_Min, Loc),
|
|
Expression => Expression (Delay_Statement (Alt))));
|
|
|
|
if Delay_Count > 1 then
|
|
Append_To (Delay_Alt,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Delay_Index, Loc),
|
|
Expression => Make_Integer_Literal (Loc, Index)));
|
|
end if;
|
|
|
|
else
|
|
Delay_Alt := New_List (
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Delay_Val, Loc),
|
|
Expression => Expression (Delay_Statement (Alt))));
|
|
|
|
if Time_Type = Standard_Duration then
|
|
Cond :=
|
|
Make_Op_Lt (Loc,
|
|
Left_Opnd => New_Occurrence_Of (Delay_Val, Loc),
|
|
Right_Opnd => New_Occurrence_Of (Delay_Min, Loc));
|
|
|
|
else
|
|
-- The scope of the time type must define a comparison
|
|
-- operator. The scope itself may not be visible, so we
|
|
-- construct a node with entity information to insure that
|
|
-- semantic analysis can find the proper operator.
|
|
|
|
Cond :=
|
|
Make_Function_Call (Loc,
|
|
Name => Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Scope (Time_Type), Loc),
|
|
Selector_Name =>
|
|
Make_Operator_Symbol (Loc,
|
|
Chars => Name_Op_Lt,
|
|
Strval => No_String)),
|
|
Parameter_Associations =>
|
|
New_List (
|
|
New_Occurrence_Of (Delay_Val, Loc),
|
|
New_Occurrence_Of (Delay_Min, Loc)));
|
|
|
|
Set_Entity (Prefix (Name (Cond)), Scope (Time_Type));
|
|
end if;
|
|
|
|
Append_To (Delay_Alt,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Cond,
|
|
Then_Statements => New_List (
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Delay_Min, Loc),
|
|
Expression => New_Occurrence_Of (Delay_Val, Loc)),
|
|
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Delay_Index, Loc),
|
|
Expression => Make_Integer_Literal (Loc, Index)))));
|
|
end if;
|
|
|
|
if Check_Guard then
|
|
Append_To (Delay_Alt,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (Guard_Open, Loc),
|
|
Expression => New_Occurrence_Of (Standard_True, Loc)));
|
|
end if;
|
|
|
|
if Present (Condition (Alt)) then
|
|
Delay_Alt := New_List (
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Condition (Alt),
|
|
Then_Statements => Delay_Alt));
|
|
end if;
|
|
|
|
Append_List (Delay_Alt, Delay_List);
|
|
|
|
Ensure_Statement_Present (Dloc, Alt);
|
|
|
|
-- If the delay alternative has a statement part, add choice to the
|
|
-- case statements for delays.
|
|
|
|
if not Is_Empty_List (Statements (Alt)) then
|
|
|
|
if Delay_Count = 1 then
|
|
Append_List (Statements (Alt), Delay_Alt_List);
|
|
|
|
else
|
|
Append_To (Delay_Alt_List,
|
|
Make_Case_Statement_Alternative (Loc,
|
|
Discrete_Choices => New_List (
|
|
Make_Integer_Literal (Loc, Index)),
|
|
Statements => Statements (Alt)));
|
|
end if;
|
|
|
|
elsif Delay_Count = 1 then
|
|
|
|
-- If the single delay has no trailing statements, add a branch
|
|
-- to the exit label to the selective wait.
|
|
|
|
Delay_Alt_List := New_List (
|
|
Make_Goto_Statement (Loc,
|
|
Name => New_Copy (Identifier (End_Lab))));
|
|
|
|
end if;
|
|
end Process_Delay_Alternative;
|
|
|
|
-- Start of processing for Expand_N_Selective_Accept
|
|
|
|
begin
|
|
Process_Statements_For_Controlled_Objects (N);
|
|
|
|
-- First insert some declarations before the select. The first is:
|
|
|
|
-- Ann : Address
|
|
|
|
-- This variable holds the parameters passed to the accept body. This
|
|
-- declaration has already been inserted by the time we get here by
|
|
-- a call to Expand_Accept_Declarations made from the semantics when
|
|
-- processing the first accept statement contained in the select. We
|
|
-- can find this entity as Accept_Address (E), where E is any of the
|
|
-- entries references by contained accept statements.
|
|
|
|
-- The first step is to scan the list of Selective_Accept_Statements
|
|
-- to find this entity, and also count the number of accepts, and
|
|
-- determine if terminated, delay or else is present:
|
|
|
|
Num_Alts := 0;
|
|
|
|
Alt := First (Alts);
|
|
while Present (Alt) loop
|
|
Process_Statements_For_Controlled_Objects (Alt);
|
|
|
|
if Nkind (Alt) = N_Accept_Alternative then
|
|
Add_Accept (Alt);
|
|
|
|
elsif Nkind (Alt) = N_Delay_Alternative then
|
|
Delay_Count := Delay_Count + 1;
|
|
|
|
-- If the delays are relative delays, the delay expressions have
|
|
-- type Standard_Duration. Otherwise they must have some time type
|
|
-- recognized by GNAT.
|
|
|
|
if Nkind (Delay_Statement (Alt)) = N_Delay_Relative_Statement then
|
|
Time_Type := Standard_Duration;
|
|
else
|
|
Time_Type := Etype (Expression (Delay_Statement (Alt)));
|
|
|
|
if Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time)
|
|
or else Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time)
|
|
then
|
|
null;
|
|
else
|
|
Error_Msg_NE (
|
|
"& is not a time type (RM 9.6(6))",
|
|
Expression (Delay_Statement (Alt)), Time_Type);
|
|
Time_Type := Standard_Duration;
|
|
Set_Etype (Expression (Delay_Statement (Alt)), Any_Type);
|
|
end if;
|
|
end if;
|
|
|
|
if No (Condition (Alt)) then
|
|
|
|
-- This guard will always be open
|
|
|
|
Check_Guard := False;
|
|
end if;
|
|
|
|
elsif Nkind (Alt) = N_Terminate_Alternative then
|
|
Adjust_Condition (Condition (Alt));
|
|
Terminate_Alt := Alt;
|
|
end if;
|
|
|
|
Num_Alts := Num_Alts + 1;
|
|
Next (Alt);
|
|
end loop;
|
|
|
|
Else_Present := Present (Else_Statements (N));
|
|
|
|
-- At the same time (see procedure Add_Accept) we build the accept list:
|
|
|
|
-- Qnn : Accept_List (1 .. num-select) := (
|
|
-- (null-body, entry-index),
|
|
-- (null-body, entry-index),
|
|
-- ..
|
|
-- (null_body, entry-index));
|
|
|
|
-- In the above declaration, null-body is True if the corresponding
|
|
-- accept has no body, and false otherwise. The entry is either the
|
|
-- entry index expression if there is no guard, or if a guard is
|
|
-- present, then an if expression of the form:
|
|
|
|
-- (if guard then entry-index else Null_Task_Entry)
|
|
|
|
-- If a guard is statically known to be false, the entry can simply
|
|
-- be omitted from the accept list.
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Qnam,
|
|
Object_Definition => New_Occurrence_Of (RTE (RE_Accept_List), Loc),
|
|
Aliased_Present => True,
|
|
Expression =>
|
|
Make_Qualified_Expression (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (RE_Accept_List), Loc),
|
|
Expression =>
|
|
Make_Aggregate (Loc, Expressions => Accept_List))));
|
|
|
|
-- Then we declare the variable that holds the index for the accept
|
|
-- that will be selected for service:
|
|
|
|
-- Xnn : Select_Index;
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Xnam,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Select_Index), Loc),
|
|
Expression =>
|
|
New_Occurrence_Of (RTE (RE_No_Rendezvous), Loc)));
|
|
|
|
-- After this follow procedure declarations for each accept body
|
|
|
|
-- procedure Pnn is
|
|
-- begin
|
|
-- ...
|
|
-- end;
|
|
|
|
-- where the ... are statements from the corresponding procedure body.
|
|
-- No parameters are involved, since the parameters are passed via Ann
|
|
-- and the parameter references have already been expanded to be direct
|
|
-- references to Ann (see Exp_Ch2.Expand_Entry_Parameter). Furthermore,
|
|
-- any embedded tasking statements (which would normally be illegal in
|
|
-- procedures), have been converted to calls to the tasking runtime so
|
|
-- there is no problem in putting them into procedures.
|
|
|
|
-- The original accept statement has been expanded into a block in
|
|
-- the same fashion as for simple accepts (see Build_Accept_Body).
|
|
|
|
-- Note: we don't really need to build these procedures for the case
|
|
-- where no delay statement is present, but it is just as easy to
|
|
-- build them unconditionally, and not significantly inefficient,
|
|
-- since if they are short they will be inlined anyway.
|
|
|
|
-- The procedure declarations have been assembled in Body_List
|
|
|
|
-- If delays are present, we must compute the required delay.
|
|
-- We first generate the declarations:
|
|
|
|
-- Delay_Index : Boolean := 0;
|
|
-- Delay_Min : Some_Time_Type.Time;
|
|
-- Delay_Val : Some_Time_Type.Time;
|
|
|
|
-- Delay_Index will be set to the index of the minimum delay, i.e. the
|
|
-- active delay that is actually chosen as the basis for the possible
|
|
-- delay if an immediate rendez-vous is not possible.
|
|
|
|
-- In the most common case there is a single delay statement, and this
|
|
-- is handled specially.
|
|
|
|
if Delay_Count > 0 then
|
|
|
|
-- Generate the required declarations
|
|
|
|
Delay_Val :=
|
|
Make_Defining_Identifier (Loc, New_External_Name ('D', 1));
|
|
Delay_Index :=
|
|
Make_Defining_Identifier (Loc, New_External_Name ('D', 2));
|
|
Delay_Min :=
|
|
Make_Defining_Identifier (Loc, New_External_Name ('D', 3));
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Delay_Val,
|
|
Object_Definition => New_Occurrence_Of (Time_Type, Loc)));
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Delay_Index,
|
|
Object_Definition => New_Occurrence_Of (Standard_Integer, Loc),
|
|
Expression => Make_Integer_Literal (Loc, 0)));
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Delay_Min,
|
|
Object_Definition => New_Occurrence_Of (Time_Type, Loc),
|
|
Expression =>
|
|
Unchecked_Convert_To (Time_Type,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Underlying_Type (Time_Type), Loc),
|
|
Attribute_Name => Name_Last))));
|
|
|
|
-- Create Duration and Delay_Mode objects used for passing a delay
|
|
-- value to RTS
|
|
|
|
D := Make_Temporary (Loc, 'D');
|
|
M := Make_Temporary (Loc, 'M');
|
|
|
|
declare
|
|
Discr : Entity_Id;
|
|
|
|
begin
|
|
-- Note that these values are defined in s-osprim.ads and must
|
|
-- be kept in sync:
|
|
--
|
|
-- Relative : constant := 0;
|
|
-- Absolute_Calendar : constant := 1;
|
|
-- Absolute_RT : constant := 2;
|
|
|
|
if Time_Type = Standard_Duration then
|
|
Discr := Make_Integer_Literal (Loc, 0);
|
|
|
|
elsif Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time) then
|
|
Discr := Make_Integer_Literal (Loc, 1);
|
|
|
|
else
|
|
pragma Assert
|
|
(Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time));
|
|
Discr := Make_Integer_Literal (Loc, 2);
|
|
end if;
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => D,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Duration, Loc)));
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => M,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Integer, Loc),
|
|
Expression => Discr));
|
|
end;
|
|
|
|
if Check_Guard then
|
|
Guard_Open :=
|
|
Make_Defining_Identifier (Loc, New_External_Name ('G', 1));
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Guard_Open,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc),
|
|
Expression =>
|
|
New_Occurrence_Of (Standard_False, Loc)));
|
|
end if;
|
|
|
|
-- Delay_Count is zero, don't need M and D set (suppress warning)
|
|
|
|
else
|
|
M := Empty;
|
|
D := Empty;
|
|
end if;
|
|
|
|
if Present (Terminate_Alt) then
|
|
|
|
-- If the terminate alternative guard is False, use
|
|
-- Simple_Mode; otherwise use Terminate_Mode.
|
|
|
|
if Present (Condition (Terminate_Alt)) then
|
|
Select_Mode := Make_If_Expression (Loc,
|
|
New_List (Condition (Terminate_Alt),
|
|
New_Occurrence_Of (RTE (RE_Terminate_Mode), Loc),
|
|
New_Occurrence_Of (RTE (RE_Simple_Mode), Loc)));
|
|
else
|
|
Select_Mode := New_Occurrence_Of (RTE (RE_Terminate_Mode), Loc);
|
|
end if;
|
|
|
|
elsif Else_Present or Delay_Count > 0 then
|
|
Select_Mode := New_Occurrence_Of (RTE (RE_Else_Mode), Loc);
|
|
|
|
else
|
|
Select_Mode := New_Occurrence_Of (RTE (RE_Simple_Mode), Loc);
|
|
end if;
|
|
|
|
Select_Call := Make_Select_Call (Select_Mode);
|
|
Append (Select_Call, Stats);
|
|
|
|
-- Now generate code to act on the result. There is an entry
|
|
-- in this case for each accept statement with a non-null body,
|
|
-- followed by a branch to the statements that follow the Accept.
|
|
-- In the absence of delay alternatives, we generate:
|
|
|
|
-- case X is
|
|
-- when No_Rendezvous => -- omitted if simple mode
|
|
-- goto Lab0;
|
|
|
|
-- when 1 =>
|
|
-- P1n;
|
|
-- goto Lab1;
|
|
|
|
-- when 2 =>
|
|
-- P2n;
|
|
-- goto Lab2;
|
|
|
|
-- when others =>
|
|
-- goto Exit;
|
|
-- end case;
|
|
--
|
|
-- Lab0: Else_Statements;
|
|
-- goto exit;
|
|
|
|
-- Lab1: Trailing_Statements1;
|
|
-- goto Exit;
|
|
--
|
|
-- Lab2: Trailing_Statements2;
|
|
-- goto Exit;
|
|
-- ...
|
|
-- Exit:
|
|
|
|
-- Generate label for common exit
|
|
|
|
End_Lab := Make_And_Declare_Label (Num_Alts + 1);
|
|
|
|
-- First entry is the default case, when no rendezvous is possible
|
|
|
|
Choices := New_List (New_Occurrence_Of (RTE (RE_No_Rendezvous), Loc));
|
|
|
|
if Else_Present then
|
|
|
|
-- If no rendezvous is possible, the else part is executed
|
|
|
|
Lab := Make_And_Declare_Label (0);
|
|
Alt_Stats := New_List (
|
|
Make_Goto_Statement (Loc,
|
|
Name => New_Copy (Identifier (Lab))));
|
|
|
|
Append (Lab, Trailing_List);
|
|
Append_List (Else_Statements (N), Trailing_List);
|
|
Append_To (Trailing_List,
|
|
Make_Goto_Statement (Loc,
|
|
Name => New_Copy (Identifier (End_Lab))));
|
|
else
|
|
Alt_Stats := New_List (
|
|
Make_Goto_Statement (Loc,
|
|
Name => New_Copy (Identifier (End_Lab))));
|
|
end if;
|
|
|
|
Append_To (Alt_List,
|
|
Make_Case_Statement_Alternative (Loc,
|
|
Discrete_Choices => Choices,
|
|
Statements => Alt_Stats));
|
|
|
|
-- We make use of the fact that Accept_Index is an integer type, and
|
|
-- generate successive literals for entries for each accept. Only those
|
|
-- for which there is a body or trailing statements get a case entry.
|
|
|
|
Alt := First (Select_Alternatives (N));
|
|
Proc := First (Body_List);
|
|
while Present (Alt) loop
|
|
|
|
if Nkind (Alt) = N_Accept_Alternative then
|
|
Process_Accept_Alternative (Alt, Index, Proc);
|
|
Index := Index + 1;
|
|
|
|
if Present
|
|
(Handled_Statement_Sequence (Accept_Statement (Alt)))
|
|
then
|
|
Next (Proc);
|
|
end if;
|
|
|
|
elsif Nkind (Alt) = N_Delay_Alternative then
|
|
Process_Delay_Alternative (Alt, Delay_Num);
|
|
Delay_Num := Delay_Num + 1;
|
|
end if;
|
|
|
|
Next (Alt);
|
|
end loop;
|
|
|
|
-- An others choice is always added to the main case, as well
|
|
-- as the delay case (to satisfy the compiler).
|
|
|
|
Append_To (Alt_List,
|
|
Make_Case_Statement_Alternative (Loc,
|
|
Discrete_Choices =>
|
|
New_List (Make_Others_Choice (Loc)),
|
|
Statements =>
|
|
New_List (Make_Goto_Statement (Loc,
|
|
Name => New_Copy (Identifier (End_Lab))))));
|
|
|
|
Accept_Case := New_List (
|
|
Make_Case_Statement (Loc,
|
|
Expression => New_Occurrence_Of (Xnam, Loc),
|
|
Alternatives => Alt_List));
|
|
|
|
Append_List (Trailing_List, Accept_Case);
|
|
Append_List (Body_List, Decls);
|
|
|
|
-- Construct case statement for trailing statements of delay
|
|
-- alternatives, if there are several of them.
|
|
|
|
if Delay_Count > 1 then
|
|
Append_To (Delay_Alt_List,
|
|
Make_Case_Statement_Alternative (Loc,
|
|
Discrete_Choices =>
|
|
New_List (Make_Others_Choice (Loc)),
|
|
Statements =>
|
|
New_List (Make_Null_Statement (Loc))));
|
|
|
|
Delay_Case := New_List (
|
|
Make_Case_Statement (Loc,
|
|
Expression => New_Occurrence_Of (Delay_Index, Loc),
|
|
Alternatives => Delay_Alt_List));
|
|
else
|
|
Delay_Case := Delay_Alt_List;
|
|
end if;
|
|
|
|
-- If there are no delay alternatives, we append the case statement
|
|
-- to the statement list.
|
|
|
|
if Delay_Count = 0 then
|
|
Append_List (Accept_Case, Stats);
|
|
|
|
-- Delay alternatives present
|
|
|
|
else
|
|
-- If delay alternatives are present we generate:
|
|
|
|
-- find minimum delay.
|
|
-- DX := minimum delay;
|
|
-- M := <delay mode>;
|
|
-- Timed_Selective_Wait (Q'Unchecked_Access, Delay_Mode, P,
|
|
-- DX, MX, X);
|
|
--
|
|
-- if X = No_Rendezvous then
|
|
-- case statement for delay statements.
|
|
-- else
|
|
-- case statement for accept alternatives.
|
|
-- end if;
|
|
|
|
declare
|
|
Cases : Node_Id;
|
|
Stmt : Node_Id;
|
|
Parms : List_Id;
|
|
Parm : Node_Id;
|
|
Conv : Node_Id;
|
|
|
|
begin
|
|
-- The type of the delay expression is known to be legal
|
|
|
|
if Time_Type = Standard_Duration then
|
|
Conv := New_Occurrence_Of (Delay_Min, Loc);
|
|
|
|
elsif Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time) then
|
|
Conv := Make_Function_Call (Loc,
|
|
New_Occurrence_Of (RTE (RO_CA_To_Duration), Loc),
|
|
New_List (New_Occurrence_Of (Delay_Min, Loc)));
|
|
|
|
else
|
|
pragma Assert
|
|
(Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time));
|
|
|
|
Conv := Make_Function_Call (Loc,
|
|
New_Occurrence_Of (RTE (RO_RT_To_Duration), Loc),
|
|
New_List (New_Occurrence_Of (Delay_Min, Loc)));
|
|
end if;
|
|
|
|
Stmt := Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (D, Loc),
|
|
Expression => Conv);
|
|
|
|
-- Change the value for Accept_Modes. (Else_Mode -> Delay_Mode)
|
|
|
|
Parms := Parameter_Associations (Select_Call);
|
|
|
|
Parm := First (Parms);
|
|
while Present (Parm) and then Parm /= Select_Mode loop
|
|
Next (Parm);
|
|
end loop;
|
|
|
|
pragma Assert (Present (Parm));
|
|
Rewrite (Parm, New_Occurrence_Of (RTE (RE_Delay_Mode), Loc));
|
|
Analyze (Parm);
|
|
|
|
-- Prepare two new parameters of Duration and Delay_Mode type
|
|
-- which represent the value and the mode of the minimum delay.
|
|
|
|
Next (Parm);
|
|
Insert_After (Parm, New_Occurrence_Of (M, Loc));
|
|
Insert_After (Parm, New_Occurrence_Of (D, Loc));
|
|
|
|
-- Create a call to RTS
|
|
|
|
Rewrite (Select_Call,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (RTE (RE_Timed_Selective_Wait), Loc),
|
|
Parameter_Associations => Parms));
|
|
|
|
-- This new call should follow the calculation of the minimum
|
|
-- delay.
|
|
|
|
Insert_List_Before (Select_Call, Delay_List);
|
|
|
|
if Check_Guard then
|
|
Stmt :=
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => New_Occurrence_Of (Guard_Open, Loc),
|
|
Then_Statements => New_List (
|
|
New_Copy_Tree (Stmt),
|
|
New_Copy_Tree (Select_Call)),
|
|
Else_Statements => Accept_Or_Raise);
|
|
Rewrite (Select_Call, Stmt);
|
|
else
|
|
Insert_Before (Select_Call, Stmt);
|
|
end if;
|
|
|
|
Cases :=
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (Xnam, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_No_Rendezvous), Loc)),
|
|
|
|
Then_Statements => Delay_Case,
|
|
Else_Statements => Accept_Case);
|
|
|
|
Append (Cases, Stats);
|
|
end;
|
|
end if;
|
|
|
|
Append (End_Lab, Stats);
|
|
|
|
-- Replace accept statement with appropriate block
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Statements => Stats)));
|
|
Analyze (N);
|
|
|
|
-- Note: have to worry more about abort deferral in above code ???
|
|
|
|
-- Final step is to unstack the Accept_Address entries for all accept
|
|
-- statements appearing in accept alternatives in the select statement
|
|
|
|
Alt := First (Alts);
|
|
while Present (Alt) loop
|
|
if Nkind (Alt) = N_Accept_Alternative then
|
|
Remove_Last_Elmt (Accept_Address
|
|
(Entity (Entry_Direct_Name (Accept_Statement (Alt)))));
|
|
end if;
|
|
|
|
Next (Alt);
|
|
end loop;
|
|
end Expand_N_Selective_Accept;
|
|
|
|
-------------------------------------------
|
|
-- Expand_N_Single_Protected_Declaration --
|
|
-------------------------------------------
|
|
|
|
-- A single protected declaration should never be present after semantic
|
|
-- analysis because it is transformed into a protected type declaration
|
|
-- and an accompanying anonymous object. This routine ensures that the
|
|
-- transformation takes place.
|
|
|
|
procedure Expand_N_Single_Protected_Declaration (N : Node_Id) is
|
|
begin
|
|
raise Program_Error;
|
|
end Expand_N_Single_Protected_Declaration;
|
|
|
|
--------------------------------------
|
|
-- Expand_N_Single_Task_Declaration --
|
|
--------------------------------------
|
|
|
|
-- A single task declaration should never be present after semantic
|
|
-- analysis because it is transformed into a task type declaration and
|
|
-- an accompanying anonymous object. This routine ensures that the
|
|
-- transformation takes place.
|
|
|
|
procedure Expand_N_Single_Task_Declaration (N : Node_Id) is
|
|
begin
|
|
raise Program_Error;
|
|
end Expand_N_Single_Task_Declaration;
|
|
|
|
------------------------
|
|
-- Expand_N_Task_Body --
|
|
------------------------
|
|
|
|
-- Given a task body
|
|
|
|
-- task body tname is
|
|
-- <declarations>
|
|
-- begin
|
|
-- <statements>
|
|
-- end x;
|
|
|
|
-- This expansion routine converts it into a procedure and sets the
|
|
-- elaboration flag for the procedure to true, to represent the fact
|
|
-- that the task body is now elaborated:
|
|
|
|
-- procedure tnameB (_Task : access tnameV) is
|
|
-- discriminal : dtype renames _Task.discriminant;
|
|
|
|
-- procedure _clean is
|
|
-- begin
|
|
-- Abort_Defer.all;
|
|
-- Complete_Task;
|
|
-- Abort_Undefer.all;
|
|
-- return;
|
|
-- end _clean;
|
|
|
|
-- begin
|
|
-- Abort_Undefer.all;
|
|
-- <declarations>
|
|
-- System.Task_Stages.Complete_Activation;
|
|
-- <statements>
|
|
-- at end
|
|
-- _clean;
|
|
-- end tnameB;
|
|
|
|
-- tnameE := True;
|
|
|
|
-- In addition, if the task body is an activator, then a call to activate
|
|
-- tasks is added at the start of the statements, before the call to
|
|
-- Complete_Activation, and if in addition the task is a master then it
|
|
-- must be established as a master. These calls are inserted and analyzed
|
|
-- in Expand_Cleanup_Actions, when the Handled_Sequence_Of_Statements is
|
|
-- expanded.
|
|
|
|
-- There is one discriminal declaration line generated for each
|
|
-- discriminant that is present to provide an easy reference point for
|
|
-- discriminant references inside the body (see Exp_Ch2.Expand_Name).
|
|
|
|
-- Note on relationship to GNARLI definition. In the GNARLI definition,
|
|
-- task body procedures have a profile (Arg : System.Address). That is
|
|
-- needed because GNARLI has to use the same access-to-subprogram type
|
|
-- for all task types. We depend here on knowing that in GNAT, passing
|
|
-- an address argument by value is identical to passing a record value
|
|
-- by access (in either case a single pointer is passed), so even though
|
|
-- this procedure has the wrong profile. In fact it's all OK, since the
|
|
-- callings sequence is identical.
|
|
|
|
procedure Expand_N_Task_Body (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Ttyp : constant Entity_Id := Corresponding_Spec (N);
|
|
Call : Node_Id;
|
|
New_N : Node_Id;
|
|
|
|
Insert_Nod : Node_Id;
|
|
-- Used to determine the proper location of wrapper body insertions
|
|
|
|
begin
|
|
-- if no task body procedure, means we had an error in configurable
|
|
-- run-time mode, and there is no point in proceeding further.
|
|
|
|
if No (Task_Body_Procedure (Ttyp)) then
|
|
return;
|
|
end if;
|
|
|
|
-- Add renaming declarations for discriminals and a declaration for the
|
|
-- entry family index (if applicable).
|
|
|
|
Install_Private_Data_Declarations
|
|
(Loc, Task_Body_Procedure (Ttyp), Ttyp, N, Declarations (N));
|
|
|
|
-- Add a call to Abort_Undefer at the very beginning of the task
|
|
-- body since this body is called with abort still deferred.
|
|
|
|
if Abort_Allowed then
|
|
Call := Build_Runtime_Call (Loc, RE_Abort_Undefer);
|
|
Insert_Before
|
|
(First (Statements (Handled_Statement_Sequence (N))), Call);
|
|
Analyze (Call);
|
|
end if;
|
|
|
|
-- The statement part has already been protected with an at_end and
|
|
-- cleanup actions. The call to Complete_Activation must be placed
|
|
-- at the head of the sequence of statements of that block. The
|
|
-- declarations have been merged in this sequence of statements but
|
|
-- the first real statement is accessible from the First_Real_Statement
|
|
-- field (which was set for exactly this purpose).
|
|
|
|
if Restricted_Profile then
|
|
Call := Build_Runtime_Call (Loc, RE_Complete_Restricted_Activation);
|
|
else
|
|
Call := Build_Runtime_Call (Loc, RE_Complete_Activation);
|
|
end if;
|
|
|
|
Insert_Before
|
|
(First_Real_Statement (Handled_Statement_Sequence (N)), Call);
|
|
Analyze (Call);
|
|
|
|
New_N :=
|
|
Make_Subprogram_Body (Loc,
|
|
Specification => Build_Task_Proc_Specification (Ttyp),
|
|
Declarations => Declarations (N),
|
|
Handled_Statement_Sequence => Handled_Statement_Sequence (N));
|
|
Set_Is_Task_Body_Procedure (New_N);
|
|
|
|
-- If the task contains generic instantiations, cleanup actions are
|
|
-- delayed until after instantiation. Transfer the activation chain to
|
|
-- the subprogram, to insure that the activation call is properly
|
|
-- generated. It the task body contains inner tasks, indicate that the
|
|
-- subprogram is a task master.
|
|
|
|
if Delay_Cleanups (Ttyp) then
|
|
Set_Activation_Chain_Entity (New_N, Activation_Chain_Entity (N));
|
|
Set_Is_Task_Master (New_N, Is_Task_Master (N));
|
|
end if;
|
|
|
|
Rewrite (N, New_N);
|
|
Analyze (N);
|
|
|
|
-- Set elaboration flag immediately after task body. If the body is a
|
|
-- subunit, the flag is set in the declarative part containing the stub.
|
|
|
|
if Nkind (Parent (N)) /= N_Subunit then
|
|
Insert_After (N,
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Identifier (Loc, New_External_Name (Chars (Ttyp), 'E')),
|
|
Expression => New_Occurrence_Of (Standard_True, Loc)));
|
|
end if;
|
|
|
|
-- Ada 2005 (AI-345): Construct the primitive entry wrapper bodies after
|
|
-- the task body. At this point all wrapper specs have been created,
|
|
-- frozen and included in the dispatch table for the task type.
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
if Nkind (Parent (N)) = N_Subunit then
|
|
Insert_Nod := Corresponding_Stub (Parent (N));
|
|
else
|
|
Insert_Nod := N;
|
|
end if;
|
|
|
|
Build_Wrapper_Bodies (Loc, Ttyp, Insert_Nod);
|
|
end if;
|
|
end Expand_N_Task_Body;
|
|
|
|
------------------------------------
|
|
-- Expand_N_Task_Type_Declaration --
|
|
------------------------------------
|
|
|
|
-- We have several things to do. First we must create a Boolean flag used
|
|
-- to mark if the body is elaborated yet. This variable gets set to True
|
|
-- when the body of the task is elaborated (we can't rely on the normal
|
|
-- ABE mechanism for the task body, since we need to pass an access to
|
|
-- this elaboration boolean to the runtime routines).
|
|
|
|
-- taskE : aliased Boolean := False;
|
|
|
|
-- Next a variable is declared to hold the task stack size (either the
|
|
-- default : Unspecified_Size, or a value that is set by a pragma
|
|
-- Storage_Size). If the value of the pragma Storage_Size is static, then
|
|
-- the variable is initialized with this value:
|
|
|
|
-- taskZ : Size_Type := Unspecified_Size;
|
|
-- or
|
|
-- taskZ : Size_Type := Size_Type (size_expression);
|
|
|
|
-- Note: No variable is needed to hold the task relative deadline since
|
|
-- its value would never be static because the parameter is of a private
|
|
-- type (Ada.Real_Time.Time_Span).
|
|
|
|
-- Next we create a corresponding record type declaration used to represent
|
|
-- values of this task. The general form of this type declaration is
|
|
|
|
-- type taskV (discriminants) is record
|
|
-- _Task_Id : Task_Id;
|
|
-- entry_family : array (bounds) of Void;
|
|
-- _Priority : Integer := priority_expression;
|
|
-- _Size : Size_Type := size_expression;
|
|
-- _Task_Info : Task_Info_Type := task_info_expression;
|
|
-- _CPU : Integer := cpu_range_expression;
|
|
-- _Relative_Deadline : Time_Span := time_span_expression;
|
|
-- _Domain : Dispatching_Domain := dd_expression;
|
|
-- end record;
|
|
|
|
-- The discriminants are present only if the corresponding task type has
|
|
-- discriminants, and they exactly mirror the task type discriminants.
|
|
|
|
-- The Id field is always present. It contains the Task_Id value, as set by
|
|
-- the call to Create_Task. Note that although the task is limited, the
|
|
-- task value record type is not limited, so there is no problem in passing
|
|
-- this field as an out parameter to Create_Task.
|
|
|
|
-- One entry_family component is present for each entry family in the task
|
|
-- definition. The bounds correspond to the bounds of the entry family
|
|
-- (which may depend on discriminants). The element type is void, since we
|
|
-- only need the bounds information for determining the entry index. Note
|
|
-- that the use of an anonymous array would normally be illegal in this
|
|
-- context, but this is a parser check, and the semantics is quite prepared
|
|
-- to handle such a case.
|
|
|
|
-- The _Size field is present only if a Storage_Size pragma appears in the
|
|
-- task definition. The expression captures the argument that was present
|
|
-- in the pragma, and is used to override the task stack size otherwise
|
|
-- associated with the task type.
|
|
|
|
-- The _Priority field is present only if the task entity has a Priority or
|
|
-- Interrupt_Priority rep item (pragma, aspect specification or attribute
|
|
-- definition clause). It will be filled at the freeze point, when the
|
|
-- record init proc is built, to capture the expression of the rep item
|
|
-- (see Build_Record_Init_Proc in Exp_Ch3). Note that it cannot be filled
|
|
-- here since aspect evaluations are delayed till the freeze point.
|
|
|
|
-- The _Task_Info field is present only if a Task_Info pragma appears in
|
|
-- the task definition. The expression captures the argument that was
|
|
-- present in the pragma, and is used to provide the Task_Image parameter
|
|
-- to the call to Create_Task.
|
|
|
|
-- The _CPU field is present only if the task entity has a CPU rep item
|
|
-- (pragma, aspect specification or attribute definition clause). It will
|
|
-- be filled at the freeze point, when the record init proc is built, to
|
|
-- capture the expression of the rep item (see Build_Record_Init_Proc in
|
|
-- Exp_Ch3). Note that it cannot be filled here since aspect evaluations
|
|
-- are delayed till the freeze point.
|
|
|
|
-- The _Relative_Deadline field is present only if a Relative_Deadline
|
|
-- pragma appears in the task definition. The expression captures the
|
|
-- argument that was present in the pragma, and is used to provide the
|
|
-- Relative_Deadline parameter to the call to Create_Task.
|
|
|
|
-- The _Domain field is present only if the task entity has a
|
|
-- Dispatching_Domain rep item (pragma, aspect specification or attribute
|
|
-- definition clause). It will be filled at the freeze point, when the
|
|
-- record init proc is built, to capture the expression of the rep item
|
|
-- (see Build_Record_Init_Proc in Exp_Ch3). Note that it cannot be filled
|
|
-- here since aspect evaluations are delayed till the freeze point.
|
|
|
|
-- When a task is declared, an instance of the task value record is
|
|
-- created. The elaboration of this declaration creates the correct bounds
|
|
-- for the entry families, and also evaluates the size, priority, and
|
|
-- task_Info expressions if needed. The initialization routine for the task
|
|
-- type itself then calls Create_Task with appropriate parameters to
|
|
-- initialize the value of the Task_Id field.
|
|
|
|
-- Note: the address of this record is passed as the "Discriminants"
|
|
-- parameter for Create_Task. Since Create_Task merely passes this onto the
|
|
-- body procedure, it does not matter that it does not quite match the
|
|
-- GNARLI model of what is being passed (the record contains more than just
|
|
-- the discriminants, but the discriminants can be found from the record
|
|
-- value).
|
|
|
|
-- The Entity_Id for this created record type is placed in the
|
|
-- Corresponding_Record_Type field of the associated task type entity.
|
|
|
|
-- Next we create a procedure specification for the task body procedure:
|
|
|
|
-- procedure taskB (_Task : access taskV);
|
|
|
|
-- Note that this must come after the record type declaration, since
|
|
-- the spec refers to this type. It turns out that the initialization
|
|
-- procedure for the value type references the task body spec, but that's
|
|
-- fine, since it won't be generated till the freeze point for the type,
|
|
-- which is certainly after the task body spec declaration.
|
|
|
|
-- Finally, we set the task index value field of the entry attribute in
|
|
-- the case of a simple entry.
|
|
|
|
procedure Expand_N_Task_Type_Declaration (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
TaskId : constant Entity_Id := Defining_Identifier (N);
|
|
Tasktyp : constant Entity_Id := Etype (Defining_Identifier (N));
|
|
Tasknm : constant Name_Id := Chars (Tasktyp);
|
|
Taskdef : constant Node_Id := Task_Definition (N);
|
|
|
|
Body_Decl : Node_Id;
|
|
Cdecls : List_Id;
|
|
Decl_Stack : Node_Id;
|
|
Elab_Decl : Node_Id;
|
|
Ent_Stack : Entity_Id;
|
|
Proc_Spec : Node_Id;
|
|
Rec_Decl : Node_Id;
|
|
Rec_Ent : Entity_Id;
|
|
Size_Decl : Entity_Id;
|
|
Task_Size : Node_Id;
|
|
|
|
function Get_Relative_Deadline_Pragma (T : Node_Id) return Node_Id;
|
|
-- Searches the task definition T for the first occurrence of the pragma
|
|
-- Relative Deadline. The caller has ensured that the pragma is present
|
|
-- in the task definition. Note that this routine cannot be implemented
|
|
-- with the Rep Item chain mechanism since Relative_Deadline pragmas are
|
|
-- not chained because their expansion into a procedure call statement
|
|
-- would cause a break in the chain.
|
|
|
|
----------------------------------
|
|
-- Get_Relative_Deadline_Pragma --
|
|
----------------------------------
|
|
|
|
function Get_Relative_Deadline_Pragma (T : Node_Id) return Node_Id is
|
|
N : Node_Id;
|
|
|
|
begin
|
|
N := First (Visible_Declarations (T));
|
|
while Present (N) loop
|
|
if Nkind (N) = N_Pragma
|
|
and then Pragma_Name (N) = Name_Relative_Deadline
|
|
then
|
|
return N;
|
|
end if;
|
|
|
|
Next (N);
|
|
end loop;
|
|
|
|
N := First (Private_Declarations (T));
|
|
while Present (N) loop
|
|
if Nkind (N) = N_Pragma
|
|
and then Pragma_Name (N) = Name_Relative_Deadline
|
|
then
|
|
return N;
|
|
end if;
|
|
|
|
Next (N);
|
|
end loop;
|
|
|
|
raise Program_Error;
|
|
end Get_Relative_Deadline_Pragma;
|
|
|
|
-- Start of processing for Expand_N_Task_Type_Declaration
|
|
|
|
begin
|
|
-- If already expanded, nothing to do
|
|
|
|
if Present (Corresponding_Record_Type (Tasktyp)) then
|
|
return;
|
|
end if;
|
|
|
|
-- Here we will do the expansion
|
|
|
|
Rec_Decl := Build_Corresponding_Record (N, Tasktyp, Loc);
|
|
|
|
Rec_Ent := Defining_Identifier (Rec_Decl);
|
|
Cdecls := Component_Items (Component_List
|
|
(Type_Definition (Rec_Decl)));
|
|
|
|
Qualify_Entity_Names (N);
|
|
|
|
-- First create the elaboration variable
|
|
|
|
Elab_Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Sloc (Tasktyp),
|
|
Chars => New_External_Name (Tasknm, 'E')),
|
|
Aliased_Present => True,
|
|
Object_Definition => New_Occurrence_Of (Standard_Boolean, Loc),
|
|
Expression => New_Occurrence_Of (Standard_False, Loc));
|
|
|
|
Insert_After (N, Elab_Decl);
|
|
|
|
-- Next create the declaration of the size variable (tasknmZ)
|
|
|
|
Set_Storage_Size_Variable (Tasktyp,
|
|
Make_Defining_Identifier (Sloc (Tasktyp),
|
|
Chars => New_External_Name (Tasknm, 'Z')));
|
|
|
|
if Present (Taskdef)
|
|
and then Has_Storage_Size_Pragma (Taskdef)
|
|
and then
|
|
Is_OK_Static_Expression
|
|
(Expression
|
|
(First (Pragma_Argument_Associations
|
|
(Get_Rep_Pragma (TaskId, Name_Storage_Size)))))
|
|
then
|
|
Size_Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Storage_Size_Variable (Tasktyp),
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Size_Type), Loc),
|
|
Expression =>
|
|
Convert_To (RTE (RE_Size_Type),
|
|
Relocate_Node
|
|
(Expression (First (Pragma_Argument_Associations
|
|
(Get_Rep_Pragma
|
|
(TaskId, Name_Storage_Size)))))));
|
|
|
|
else
|
|
Size_Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Storage_Size_Variable (Tasktyp),
|
|
Object_Definition =>
|
|
New_Occurrence_Of (RTE (RE_Size_Type), Loc),
|
|
Expression =>
|
|
New_Occurrence_Of (RTE (RE_Unspecified_Size), Loc));
|
|
end if;
|
|
|
|
Insert_After (Elab_Decl, Size_Decl);
|
|
|
|
-- Next build the rest of the corresponding record declaration. This is
|
|
-- done last, since the corresponding record initialization procedure
|
|
-- will reference the previously created entities.
|
|
|
|
-- Fill in the component declarations -- first the _Task_Id field
|
|
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uTask_Id),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication => New_Occurrence_Of (RTE (RO_ST_Task_Id),
|
|
Loc))));
|
|
|
|
-- Declare static ATCB (that is, created by the expander) if we are
|
|
-- using the Restricted run time.
|
|
|
|
if Restricted_Profile then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uATCB),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => True,
|
|
Subtype_Indication => Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (RE_Ada_Task_Control_Block), Loc),
|
|
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints =>
|
|
New_List (Make_Integer_Literal (Loc, 0)))))));
|
|
|
|
end if;
|
|
|
|
-- Declare static stack (that is, created by the expander) if we are
|
|
-- using the Restricted run time on a bare board configuration.
|
|
|
|
if Restricted_Profile and then Preallocated_Stacks_On_Target then
|
|
|
|
-- First we need to extract the appropriate stack size
|
|
|
|
Ent_Stack := Make_Defining_Identifier (Loc, Name_uStack);
|
|
|
|
if Present (Taskdef) and then Has_Storage_Size_Pragma (Taskdef) then
|
|
declare
|
|
Expr_N : constant Node_Id :=
|
|
Expression (First (
|
|
Pragma_Argument_Associations (
|
|
Get_Rep_Pragma (TaskId, Name_Storage_Size))));
|
|
Etyp : constant Entity_Id := Etype (Expr_N);
|
|
P : constant Node_Id := Parent (Expr_N);
|
|
|
|
begin
|
|
-- The stack is defined inside the corresponding record.
|
|
-- Therefore if the size of the stack is set by means of
|
|
-- a discriminant, we must reference the discriminant of the
|
|
-- corresponding record type.
|
|
|
|
if Nkind (Expr_N) in N_Has_Entity
|
|
and then Present (Discriminal_Link (Entity (Expr_N)))
|
|
then
|
|
Task_Size :=
|
|
New_Occurrence_Of
|
|
(CR_Discriminant (Discriminal_Link (Entity (Expr_N))),
|
|
Loc);
|
|
Set_Parent (Task_Size, P);
|
|
Set_Etype (Task_Size, Etyp);
|
|
Set_Analyzed (Task_Size);
|
|
|
|
else
|
|
Task_Size := Relocate_Node (Expr_N);
|
|
end if;
|
|
end;
|
|
|
|
else
|
|
Task_Size :=
|
|
New_Occurrence_Of (RTE (RE_Default_Stack_Size), Loc);
|
|
end if;
|
|
|
|
Decl_Stack := Make_Component_Declaration (Loc,
|
|
Defining_Identifier => Ent_Stack,
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => True,
|
|
Subtype_Indication => Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (RE_Storage_Array), Loc),
|
|
|
|
Constraint =>
|
|
Make_Index_Or_Discriminant_Constraint (Loc,
|
|
Constraints => New_List (Make_Range (Loc,
|
|
Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
High_Bound => Convert_To (RTE (RE_Storage_Offset),
|
|
Task_Size)))))));
|
|
|
|
Append_To (Cdecls, Decl_Stack);
|
|
|
|
-- The appropriate alignment for the stack is ensured by the run-time
|
|
-- code in charge of task creation.
|
|
|
|
end if;
|
|
|
|
-- Add components for entry families
|
|
|
|
Collect_Entry_Families (Loc, Cdecls, Size_Decl, Tasktyp);
|
|
|
|
-- Add the _Priority component if a Interrupt_Priority or Priority rep
|
|
-- item is present.
|
|
|
|
if Has_Rep_Item (TaskId, Name_Priority, Check_Parents => False) then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uPriority),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (Standard_Integer, Loc))));
|
|
end if;
|
|
|
|
-- Add the _Size component if a Storage_Size pragma is present
|
|
|
|
if Present (Taskdef) and then Has_Storage_Size_Pragma (Taskdef) then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uSize),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (RTE (RE_Size_Type), Loc)),
|
|
|
|
Expression =>
|
|
Convert_To (RTE (RE_Size_Type),
|
|
Relocate_Node (
|
|
Expression (First (
|
|
Pragma_Argument_Associations (
|
|
Get_Rep_Pragma (TaskId, Name_Storage_Size))))))));
|
|
end if;
|
|
|
|
-- Add the _Task_Info component if a Task_Info pragma is present
|
|
|
|
if Has_Rep_Pragma (TaskId, Name_Task_Info, Check_Parents => False) then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uTask_Info),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (RTE (RE_Task_Info_Type), Loc)),
|
|
|
|
Expression => New_Copy (
|
|
Expression (First (
|
|
Pragma_Argument_Associations (
|
|
Get_Rep_Pragma
|
|
(TaskId, Name_Task_Info, Check_Parents => False)))))));
|
|
end if;
|
|
|
|
-- Add the _CPU component if a CPU rep item is present
|
|
|
|
if Has_Rep_Item (TaskId, Name_CPU, Check_Parents => False) then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uCPU),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (RTE (RE_CPU_Range), Loc))));
|
|
end if;
|
|
|
|
-- Add the _Relative_Deadline component if a Relative_Deadline pragma is
|
|
-- present. If we are using a restricted run time this component will
|
|
-- not be added (deadlines are not allowed by the Ravenscar profile).
|
|
|
|
if not Restricted_Profile
|
|
and then Present (Taskdef)
|
|
and then Has_Relative_Deadline_Pragma (Taskdef)
|
|
then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uRelative_Deadline),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (RTE (RE_Time_Span), Loc)),
|
|
|
|
Expression =>
|
|
Convert_To (RTE (RE_Time_Span),
|
|
Relocate_Node (
|
|
Expression (First (
|
|
Pragma_Argument_Associations (
|
|
Get_Relative_Deadline_Pragma (Taskdef))))))));
|
|
end if;
|
|
|
|
-- Add the _Dispatching_Domain component if a Dispatching_Domain rep
|
|
-- item is present. If we are using a restricted run time this component
|
|
-- will not be added (dispatching domains are not allowed by the
|
|
-- Ravenscar profile).
|
|
|
|
if not Restricted_Profile
|
|
and then
|
|
Has_Rep_Item
|
|
(TaskId, Name_Dispatching_Domain, Check_Parents => False)
|
|
then
|
|
Append_To (Cdecls,
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uDispatching_Domain),
|
|
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Dispatching_Domain_Access), Loc))));
|
|
end if;
|
|
|
|
Insert_After (Size_Decl, Rec_Decl);
|
|
|
|
-- Analyze the record declaration immediately after construction,
|
|
-- because the initialization procedure is needed for single task
|
|
-- declarations before the next entity is analyzed.
|
|
|
|
Analyze (Rec_Decl);
|
|
|
|
-- Create the declaration of the task body procedure
|
|
|
|
Proc_Spec := Build_Task_Proc_Specification (Tasktyp);
|
|
Body_Decl :=
|
|
Make_Subprogram_Declaration (Loc,
|
|
Specification => Proc_Spec);
|
|
Set_Is_Task_Body_Procedure (Body_Decl);
|
|
|
|
Insert_After (Rec_Decl, Body_Decl);
|
|
|
|
-- The subprogram does not comes from source, so we have to indicate the
|
|
-- need for debugging information explicitly.
|
|
|
|
if Comes_From_Source (Original_Node (N)) then
|
|
Set_Debug_Info_Needed (Defining_Entity (Proc_Spec));
|
|
end if;
|
|
|
|
-- Ada 2005 (AI-345): Construct the primitive entry wrapper specs before
|
|
-- the corresponding record has been frozen.
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
Build_Wrapper_Specs (Loc, Tasktyp, Rec_Decl);
|
|
end if;
|
|
|
|
-- Ada 2005 (AI-345): We must defer freezing to allow further
|
|
-- declaration of primitive subprograms covering task interfaces
|
|
|
|
if Ada_Version <= Ada_95 then
|
|
|
|
-- Now we can freeze the corresponding record. This needs manually
|
|
-- freezing, since it is really part of the task type, and the task
|
|
-- type is frozen at this stage. We of course need the initialization
|
|
-- procedure for this corresponding record type and we won't get it
|
|
-- in time if we don't freeze now.
|
|
|
|
declare
|
|
L : constant List_Id := Freeze_Entity (Rec_Ent, N);
|
|
begin
|
|
if Is_Non_Empty_List (L) then
|
|
Insert_List_After (Body_Decl, L);
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
-- Complete the expansion of access types to the current task type, if
|
|
-- any were declared.
|
|
|
|
Expand_Previous_Access_Type (Tasktyp);
|
|
|
|
-- Create wrappers for entries that have contract cases, preconditions
|
|
-- and postconditions.
|
|
|
|
declare
|
|
Ent : Entity_Id;
|
|
|
|
begin
|
|
Ent := First_Entity (Tasktyp);
|
|
while Present (Ent) loop
|
|
if Ekind_In (Ent, E_Entry, E_Entry_Family) then
|
|
Build_Contract_Wrapper (Ent, N);
|
|
end if;
|
|
|
|
Next_Entity (Ent);
|
|
end loop;
|
|
end;
|
|
end Expand_N_Task_Type_Declaration;
|
|
|
|
-------------------------------
|
|
-- Expand_N_Timed_Entry_Call --
|
|
-------------------------------
|
|
|
|
-- A timed entry call in normal case is not implemented using ATC mechanism
|
|
-- anymore for efficiency reason.
|
|
|
|
-- select
|
|
-- T.E;
|
|
-- S1;
|
|
-- or
|
|
-- delay D;
|
|
-- S2;
|
|
-- end select;
|
|
|
|
-- is expanded as follows:
|
|
|
|
-- 1) When T.E is a task entry_call;
|
|
|
|
-- declare
|
|
-- B : Boolean;
|
|
-- X : Task_Entry_Index := <entry index>;
|
|
-- DX : Duration := To_Duration (D);
|
|
-- M : Delay_Mode := <discriminant>;
|
|
-- P : parms := (parm, parm, parm);
|
|
|
|
-- begin
|
|
-- Timed_Protected_Entry_Call
|
|
-- (<acceptor-task>, X, P'Address, DX, M, B);
|
|
-- if B then
|
|
-- S1;
|
|
-- else
|
|
-- S2;
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- 2) When T.E is a protected entry_call;
|
|
|
|
-- declare
|
|
-- B : Boolean;
|
|
-- X : Protected_Entry_Index := <entry index>;
|
|
-- DX : Duration := To_Duration (D);
|
|
-- M : Delay_Mode := <discriminant>;
|
|
-- P : parms := (parm, parm, parm);
|
|
|
|
-- begin
|
|
-- Timed_Protected_Entry_Call
|
|
-- (<object>'unchecked_access, X, P'Address, DX, M, B);
|
|
-- if B then
|
|
-- S1;
|
|
-- else
|
|
-- S2;
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- 3) Ada 2005 (AI-345): When T.E is a dispatching procedure call, there
|
|
-- is no delay and the triggering statements are executed. We first
|
|
-- determine the kind of the triggering call and then execute a
|
|
-- synchronized operation or a direct call.
|
|
|
|
-- declare
|
|
-- B : Boolean := False;
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
-- DX : Duration := To_Duration (D)
|
|
-- K : Ada.Tags.Tagged_Kind :=
|
|
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
|
|
-- M : Integer :=...;
|
|
-- P : Parameters := (Param1 .. ParamN);
|
|
-- S : Integer;
|
|
|
|
-- begin
|
|
-- if K = Ada.Tags.TK_Limited_Tagged
|
|
-- or else K = Ada.Tags.TK_Tagged
|
|
-- then
|
|
-- <dispatching-call>;
|
|
-- B := True;
|
|
|
|
-- else
|
|
-- S :=
|
|
-- Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (<object>), DT_Position (<dispatching-call>));
|
|
|
|
-- _Disp_Timed_Select (<object>, S, P'Address, DX, M, C, B);
|
|
|
|
-- if C = POK_Protected_Entry
|
|
-- or else C = POK_Task_Entry
|
|
-- then
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
-- end if;
|
|
|
|
-- if B then
|
|
-- if C = POK_Procedure
|
|
-- or else C = POK_Protected_Procedure
|
|
-- or else C = POK_Task_Procedure
|
|
-- then
|
|
-- <dispatching-call>;
|
|
-- end if;
|
|
-- end if;
|
|
-- end if;
|
|
|
|
-- if B then
|
|
-- <triggering-statements>
|
|
-- else
|
|
-- <timed-statements>
|
|
-- end if;
|
|
-- end;
|
|
|
|
-- The triggering statement and the sequence of timed statements have not
|
|
-- been analyzed yet (see Analyzed_Timed_Entry_Call), but they may contain
|
|
-- global references if within an instantiation.
|
|
|
|
procedure Expand_N_Timed_Entry_Call (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
Actuals : List_Id;
|
|
Blk_Typ : Entity_Id;
|
|
Call : Node_Id;
|
|
Call_Ent : Entity_Id;
|
|
Conc_Typ_Stmts : List_Id;
|
|
Concval : Node_Id;
|
|
D_Alt : constant Node_Id := Delay_Alternative (N);
|
|
D_Conv : Node_Id;
|
|
D_Disc : Node_Id;
|
|
D_Stat : Node_Id := Delay_Statement (D_Alt);
|
|
D_Stats : List_Id;
|
|
D_Type : Entity_Id;
|
|
Decls : List_Id;
|
|
Dummy : Node_Id;
|
|
E_Alt : constant Node_Id := Entry_Call_Alternative (N);
|
|
E_Call : Node_Id := Entry_Call_Statement (E_Alt);
|
|
E_Stats : List_Id;
|
|
Ename : Node_Id;
|
|
Formals : List_Id;
|
|
Index : Node_Id;
|
|
Is_Disp_Select : Boolean;
|
|
Lim_Typ_Stmts : List_Id;
|
|
N_Stats : List_Id;
|
|
Obj : Entity_Id;
|
|
Param : Node_Id;
|
|
Params : List_Id;
|
|
Stmt : Node_Id;
|
|
Stmts : List_Id;
|
|
Unpack : List_Id;
|
|
|
|
B : Entity_Id; -- Call status flag
|
|
C : Entity_Id; -- Call kind
|
|
D : Entity_Id; -- Delay
|
|
K : Entity_Id; -- Tagged kind
|
|
M : Entity_Id; -- Delay mode
|
|
P : Entity_Id; -- Parameter block
|
|
S : Entity_Id; -- Primitive operation slot
|
|
|
|
-- Start of processing for Expand_N_Timed_Entry_Call
|
|
|
|
begin
|
|
-- Under the Ravenscar profile, timed entry calls are excluded. An error
|
|
-- was already reported on spec, so do not attempt to expand the call.
|
|
|
|
if Restriction_Active (No_Select_Statements) then
|
|
return;
|
|
end if;
|
|
|
|
Process_Statements_For_Controlled_Objects (E_Alt);
|
|
Process_Statements_For_Controlled_Objects (D_Alt);
|
|
|
|
Ensure_Statement_Present (Sloc (D_Stat), D_Alt);
|
|
|
|
-- Retrieve E_Stats and D_Stats now because the finalization machinery
|
|
-- may wrap them in blocks.
|
|
|
|
E_Stats := Statements (E_Alt);
|
|
D_Stats := Statements (D_Alt);
|
|
|
|
-- The arguments in the call may require dynamic allocation, and the
|
|
-- call statement may have been transformed into a block. The block
|
|
-- may contain additional declarations for internal entities, and the
|
|
-- original call is found by sequential search.
|
|
|
|
if Nkind (E_Call) = N_Block_Statement then
|
|
E_Call := First (Statements (Handled_Statement_Sequence (E_Call)));
|
|
while not Nkind_In (E_Call, N_Procedure_Call_Statement,
|
|
N_Entry_Call_Statement)
|
|
loop
|
|
Next (E_Call);
|
|
end loop;
|
|
end if;
|
|
|
|
Is_Disp_Select :=
|
|
Ada_Version >= Ada_2005
|
|
and then Nkind (E_Call) = N_Procedure_Call_Statement;
|
|
|
|
if Is_Disp_Select then
|
|
Extract_Dispatching_Call (E_Call, Call_Ent, Obj, Actuals, Formals);
|
|
Decls := New_List;
|
|
|
|
Stmts := New_List;
|
|
|
|
-- Generate:
|
|
-- B : Boolean := False;
|
|
|
|
B := Build_B (Loc, Decls);
|
|
|
|
-- Generate:
|
|
-- C : Ada.Tags.Prim_Op_Kind;
|
|
|
|
C := Build_C (Loc, Decls);
|
|
|
|
-- Because the analysis of all statements was disabled, manually
|
|
-- analyze the delay statement.
|
|
|
|
Analyze (D_Stat);
|
|
D_Stat := Original_Node (D_Stat);
|
|
|
|
else
|
|
-- Build an entry call using Simple_Entry_Call
|
|
|
|
Extract_Entry (E_Call, Concval, Ename, Index);
|
|
Build_Simple_Entry_Call (E_Call, Concval, Ename, Index);
|
|
|
|
Decls := Declarations (E_Call);
|
|
Stmts := Statements (Handled_Statement_Sequence (E_Call));
|
|
|
|
if No (Decls) then
|
|
Decls := New_List;
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- B : Boolean;
|
|
|
|
B := Make_Defining_Identifier (Loc, Name_uB);
|
|
|
|
Prepend_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => B,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Boolean, Loc)));
|
|
end if;
|
|
|
|
-- Duration and mode processing
|
|
|
|
D_Type := Base_Type (Etype (Expression (D_Stat)));
|
|
|
|
-- Use the type of the delay expression (Calendar or Real_Time) to
|
|
-- generate the appropriate conversion.
|
|
|
|
if Nkind (D_Stat) = N_Delay_Relative_Statement then
|
|
D_Disc := Make_Integer_Literal (Loc, 0);
|
|
D_Conv := Relocate_Node (Expression (D_Stat));
|
|
|
|
elsif Is_RTE (D_Type, RO_CA_Time) then
|
|
D_Disc := Make_Integer_Literal (Loc, 1);
|
|
D_Conv :=
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RO_CA_To_Duration), Loc),
|
|
Parameter_Associations =>
|
|
New_List (New_Copy (Expression (D_Stat))));
|
|
|
|
else pragma Assert (Is_RTE (D_Type, RO_RT_Time));
|
|
D_Disc := Make_Integer_Literal (Loc, 2);
|
|
D_Conv :=
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (RTE (RO_RT_To_Duration), Loc),
|
|
Parameter_Associations =>
|
|
New_List (New_Copy (Expression (D_Stat))));
|
|
end if;
|
|
|
|
D := Make_Temporary (Loc, 'D');
|
|
|
|
-- Generate:
|
|
-- D : Duration;
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => D,
|
|
Object_Definition => New_Occurrence_Of (Standard_Duration, Loc)));
|
|
|
|
M := Make_Temporary (Loc, 'M');
|
|
|
|
-- Generate:
|
|
-- M : Integer := (0 | 1 | 2);
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => M,
|
|
Object_Definition => New_Occurrence_Of (Standard_Integer, Loc),
|
|
Expression => D_Disc));
|
|
|
|
-- Do the assignment at this stage only because the evaluation of the
|
|
-- expression must not occur before (see ACVC C97302A).
|
|
|
|
Append_To (Stmts,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (D, Loc),
|
|
Expression => D_Conv));
|
|
|
|
-- Parameter block processing
|
|
|
|
-- Manually create the parameter block for dispatching calls. In the
|
|
-- case of entries, the block has already been created during the call
|
|
-- to Build_Simple_Entry_Call.
|
|
|
|
if Is_Disp_Select then
|
|
|
|
-- Tagged kind processing, generate:
|
|
-- K : Ada.Tags.Tagged_Kind :=
|
|
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag <object>));
|
|
|
|
K := Build_K (Loc, Decls, Obj);
|
|
|
|
Blk_Typ := Build_Parameter_Block (Loc, Actuals, Formals, Decls);
|
|
P :=
|
|
Parameter_Block_Pack (Loc, Blk_Typ, Actuals, Formals, Decls, Stmts);
|
|
|
|
-- Dispatch table slot processing, generate:
|
|
-- S : Integer;
|
|
|
|
S := Build_S (Loc, Decls);
|
|
|
|
-- Generate:
|
|
-- S := Ada.Tags.Get_Offset_Index
|
|
-- (Ada.Tags.Tag (<object>), DT_Position (Call_Ent));
|
|
|
|
Conc_Typ_Stmts :=
|
|
New_List (Build_S_Assignment (Loc, S, Obj, Call_Ent));
|
|
|
|
-- Generate:
|
|
-- _Disp_Timed_Select (<object>, S, P'Address, D, M, C, B);
|
|
|
|
-- where Obj is the controlling formal parameter, S is the dispatch
|
|
-- table slot number of the dispatching operation, P is the wrapped
|
|
-- parameter block, D is the duration, M is the duration mode, C is
|
|
-- the call kind and B is the call status.
|
|
|
|
Params := New_List;
|
|
|
|
Append_To (Params, New_Copy_Tree (Obj));
|
|
Append_To (Params, New_Occurrence_Of (S, Loc));
|
|
Append_To (Params,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (P, Loc),
|
|
Attribute_Name => Name_Address));
|
|
Append_To (Params, New_Occurrence_Of (D, Loc));
|
|
Append_To (Params, New_Occurrence_Of (M, Loc));
|
|
Append_To (Params, New_Occurrence_Of (C, Loc));
|
|
Append_To (Params, New_Occurrence_Of (B, Loc));
|
|
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(Find_Prim_Op
|
|
(Etype (Etype (Obj)), Name_uDisp_Timed_Select), Loc),
|
|
Parameter_Associations => Params));
|
|
|
|
-- Generate:
|
|
-- if C = POK_Protected_Entry
|
|
-- or else C = POK_Task_Entry
|
|
-- then
|
|
-- Param1 := P.Param1;
|
|
-- ...
|
|
-- ParamN := P.ParamN;
|
|
-- end if;
|
|
|
|
Unpack := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
|
|
|
|
-- Generate the if statement only when the packed parameters need
|
|
-- explicit assignments to their corresponding actuals.
|
|
|
|
if Present (Unpack) then
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
|
|
Condition =>
|
|
Make_Or_Else (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_POK_Protected_Entry), Loc)),
|
|
|
|
Right_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Task_Entry), Loc))),
|
|
|
|
Then_Statements => Unpack));
|
|
end if;
|
|
|
|
-- Generate:
|
|
|
|
-- if B then
|
|
-- if C = POK_Procedure
|
|
-- or else C = POK_Protected_Procedure
|
|
-- or else C = POK_Task_Procedure
|
|
-- then
|
|
-- <dispatching-call>
|
|
-- end if;
|
|
-- end if;
|
|
|
|
N_Stats := New_List (
|
|
Make_Implicit_If_Statement (N,
|
|
Condition =>
|
|
Make_Or_Else (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (RE_POK_Procedure), Loc)),
|
|
|
|
Right_Opnd =>
|
|
Make_Or_Else (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of (RTE (
|
|
RE_POK_Protected_Procedure), Loc)),
|
|
Right_Opnd =>
|
|
Make_Op_Eq (Loc,
|
|
Left_Opnd => New_Occurrence_Of (C, Loc),
|
|
Right_Opnd =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_POK_Task_Procedure), Loc)))),
|
|
|
|
Then_Statements => New_List (E_Call)));
|
|
|
|
Append_To (Conc_Typ_Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => New_Occurrence_Of (B, Loc),
|
|
Then_Statements => N_Stats));
|
|
|
|
-- Generate:
|
|
-- <dispatching-call>;
|
|
-- B := True;
|
|
|
|
Lim_Typ_Stmts :=
|
|
New_List (New_Copy_Tree (E_Call),
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (B, Loc),
|
|
Expression => New_Occurrence_Of (Standard_True, Loc)));
|
|
|
|
-- Generate:
|
|
-- if K = Ada.Tags.TK_Limited_Tagged
|
|
-- or else K = Ada.Tags.TK_Tagged
|
|
-- then
|
|
-- Lim_Typ_Stmts
|
|
-- else
|
|
-- Conc_Typ_Stmts
|
|
-- end if;
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => Build_Dispatching_Tag_Check (K, N),
|
|
Then_Statements => Lim_Typ_Stmts,
|
|
Else_Statements => Conc_Typ_Stmts));
|
|
|
|
-- Generate:
|
|
|
|
-- if B then
|
|
-- <triggering-statements>
|
|
-- else
|
|
-- <timed-statements>
|
|
-- end if;
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => New_Occurrence_Of (B, Loc),
|
|
Then_Statements => E_Stats,
|
|
Else_Statements => D_Stats));
|
|
|
|
else
|
|
-- Simple case of a nondispatching trigger. Skip assignments to
|
|
-- temporaries created for in-out parameters.
|
|
|
|
-- This makes unwarranted assumptions about the shape of the expanded
|
|
-- tree for the call, and should be cleaned up ???
|
|
|
|
Stmt := First (Stmts);
|
|
while Nkind (Stmt) /= N_Procedure_Call_Statement loop
|
|
Next (Stmt);
|
|
end loop;
|
|
|
|
-- Do the assignment at this stage only because the evaluation
|
|
-- of the expression must not occur before (see ACVC C97302A).
|
|
|
|
Insert_Before (Stmt,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Occurrence_Of (D, Loc),
|
|
Expression => D_Conv));
|
|
|
|
Call := Stmt;
|
|
Params := Parameter_Associations (Call);
|
|
|
|
-- For a protected type, we build a Timed_Protected_Entry_Call
|
|
|
|
if Is_Protected_Type (Etype (Concval)) then
|
|
|
|
-- Create a new call statement
|
|
|
|
Param := First (Params);
|
|
while Present (Param)
|
|
and then not Is_RTE (Etype (Param), RE_Call_Modes)
|
|
loop
|
|
Next (Param);
|
|
end loop;
|
|
|
|
Dummy := Remove_Next (Next (Param));
|
|
|
|
-- Remove garbage is following the Cancel_Param if present
|
|
|
|
Dummy := Next (Param);
|
|
|
|
-- Remove the mode of the Protected_Entry_Call call, then remove
|
|
-- the Communication_Block of the Protected_Entry_Call call, and
|
|
-- finally add Duration and a Delay_Mode parameter
|
|
|
|
pragma Assert (Present (Param));
|
|
Rewrite (Param, New_Occurrence_Of (D, Loc));
|
|
|
|
Rewrite (Dummy, New_Occurrence_Of (M, Loc));
|
|
|
|
-- Add a Boolean flag for successful entry call
|
|
|
|
Append_To (Params, New_Occurrence_Of (B, Loc));
|
|
|
|
case Corresponding_Runtime_Package (Etype (Concval)) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Rewrite (Call,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Timed_Protected_Entry_Call), Loc),
|
|
Parameter_Associations => Params));
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- For the task case, build a Timed_Task_Entry_Call
|
|
|
|
else
|
|
-- Create a new call statement
|
|
|
|
Append_To (Params, New_Occurrence_Of (D, Loc));
|
|
Append_To (Params, New_Occurrence_Of (M, Loc));
|
|
Append_To (Params, New_Occurrence_Of (B, Loc));
|
|
|
|
Rewrite (Call,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Timed_Task_Entry_Call), Loc),
|
|
Parameter_Associations => Params));
|
|
end if;
|
|
|
|
Append_To (Stmts,
|
|
Make_Implicit_If_Statement (N,
|
|
Condition => New_Occurrence_Of (B, Loc),
|
|
Then_Statements => E_Stats,
|
|
Else_Statements => D_Stats));
|
|
end if;
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Declarations => Decls,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
|
|
|
|
Analyze (N);
|
|
end Expand_N_Timed_Entry_Call;
|
|
|
|
----------------------------------------
|
|
-- Expand_Protected_Body_Declarations --
|
|
----------------------------------------
|
|
|
|
procedure Expand_Protected_Body_Declarations
|
|
(N : Node_Id;
|
|
Spec_Id : Entity_Id)
|
|
is
|
|
begin
|
|
if No_Run_Time_Mode then
|
|
Error_Msg_CRT ("protected body", N);
|
|
return;
|
|
|
|
elsif Expander_Active then
|
|
|
|
-- Associate discriminals with the first subprogram or entry body to
|
|
-- be expanded.
|
|
|
|
if Present (First_Protected_Operation (Declarations (N))) then
|
|
Set_Discriminals (Parent (Spec_Id));
|
|
end if;
|
|
end if;
|
|
end Expand_Protected_Body_Declarations;
|
|
|
|
-------------------------
|
|
-- External_Subprogram --
|
|
-------------------------
|
|
|
|
function External_Subprogram (E : Entity_Id) return Entity_Id is
|
|
Subp : constant Entity_Id := Protected_Body_Subprogram (E);
|
|
|
|
begin
|
|
-- The internal and external subprograms follow each other on the entity
|
|
-- chain. Note that previously private operations had no separate
|
|
-- external subprogram. We now create one in all cases, because a
|
|
-- private operation may actually appear in an external call, through
|
|
-- a 'Access reference used for a callback.
|
|
|
|
-- If the operation is a function that returns an anonymous access type,
|
|
-- the corresponding itype appears before the operation, and must be
|
|
-- skipped.
|
|
|
|
-- This mechanism is fragile, there should be a real link between the
|
|
-- two versions of the operation, but there is no place to put it ???
|
|
|
|
if Is_Access_Type (Next_Entity (Subp)) then
|
|
return Next_Entity (Next_Entity (Subp));
|
|
else
|
|
return Next_Entity (Subp);
|
|
end if;
|
|
end External_Subprogram;
|
|
|
|
------------------------------
|
|
-- Extract_Dispatching_Call --
|
|
------------------------------
|
|
|
|
procedure Extract_Dispatching_Call
|
|
(N : Node_Id;
|
|
Call_Ent : out Entity_Id;
|
|
Object : out Entity_Id;
|
|
Actuals : out List_Id;
|
|
Formals : out List_Id)
|
|
is
|
|
Call_Nam : Node_Id;
|
|
|
|
begin
|
|
pragma Assert (Nkind (N) = N_Procedure_Call_Statement);
|
|
|
|
if Present (Original_Node (N)) then
|
|
Call_Nam := Name (Original_Node (N));
|
|
else
|
|
Call_Nam := Name (N);
|
|
end if;
|
|
|
|
-- Retrieve the name of the dispatching procedure. It contains the
|
|
-- dispatch table slot number.
|
|
|
|
loop
|
|
case Nkind (Call_Nam) is
|
|
when N_Identifier =>
|
|
exit;
|
|
|
|
when N_Selected_Component =>
|
|
Call_Nam := Selector_Name (Call_Nam);
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
|
|
end case;
|
|
end loop;
|
|
|
|
Actuals := Parameter_Associations (N);
|
|
Call_Ent := Entity (Call_Nam);
|
|
Formals := Parameter_Specifications (Parent (Call_Ent));
|
|
Object := First (Actuals);
|
|
|
|
if Present (Original_Node (Object)) then
|
|
Object := Original_Node (Object);
|
|
end if;
|
|
|
|
-- If the type of the dispatching object is an access type then return
|
|
-- an explicit dereference.
|
|
|
|
if Is_Access_Type (Etype (Object)) then
|
|
Object := Make_Explicit_Dereference (Sloc (N), Object);
|
|
Analyze (Object);
|
|
end if;
|
|
end Extract_Dispatching_Call;
|
|
|
|
-------------------
|
|
-- Extract_Entry --
|
|
-------------------
|
|
|
|
procedure Extract_Entry
|
|
(N : Node_Id;
|
|
Concval : out Node_Id;
|
|
Ename : out Node_Id;
|
|
Index : out Node_Id)
|
|
is
|
|
Nam : constant Node_Id := Name (N);
|
|
|
|
begin
|
|
-- For a simple entry, the name is a selected component, with the
|
|
-- prefix being the task value, and the selector being the entry.
|
|
|
|
if Nkind (Nam) = N_Selected_Component then
|
|
Concval := Prefix (Nam);
|
|
Ename := Selector_Name (Nam);
|
|
Index := Empty;
|
|
|
|
-- For a member of an entry family, the name is an indexed component
|
|
-- where the prefix is a selected component, whose prefix in turn is
|
|
-- the task value, and whose selector is the entry family. The single
|
|
-- expression in the expressions list of the indexed component is the
|
|
-- subscript for the family.
|
|
|
|
else pragma Assert (Nkind (Nam) = N_Indexed_Component);
|
|
Concval := Prefix (Prefix (Nam));
|
|
Ename := Selector_Name (Prefix (Nam));
|
|
Index := First (Expressions (Nam));
|
|
end if;
|
|
|
|
-- Through indirection, the type may actually be a limited view of a
|
|
-- concurrent type. When compiling a call, the non-limited view of the
|
|
-- type is visible.
|
|
|
|
if From_Limited_With (Etype (Concval)) then
|
|
Set_Etype (Concval, Non_Limited_View (Etype (Concval)));
|
|
end if;
|
|
end Extract_Entry;
|
|
|
|
-------------------
|
|
-- Family_Offset --
|
|
-------------------
|
|
|
|
function Family_Offset
|
|
(Loc : Source_Ptr;
|
|
Hi : Node_Id;
|
|
Lo : Node_Id;
|
|
Ttyp : Entity_Id;
|
|
Cap : Boolean) return Node_Id
|
|
is
|
|
Ityp : Entity_Id;
|
|
Real_Hi : Node_Id;
|
|
Real_Lo : Node_Id;
|
|
|
|
function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id;
|
|
-- If one of the bounds is a reference to a discriminant, replace with
|
|
-- corresponding discriminal of type. Within the body of a task retrieve
|
|
-- the renamed discriminant by simple visibility, using its generated
|
|
-- name. Within a protected object, find the original discriminant and
|
|
-- replace it with the discriminal of the current protected operation.
|
|
|
|
------------------------------
|
|
-- Convert_Discriminant_Ref --
|
|
------------------------------
|
|
|
|
function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (Bound);
|
|
B : Node_Id;
|
|
D : Entity_Id;
|
|
|
|
begin
|
|
if Is_Entity_Name (Bound)
|
|
and then Ekind (Entity (Bound)) = E_Discriminant
|
|
then
|
|
if Is_Task_Type (Ttyp) and then Has_Completion (Ttyp) then
|
|
B := Make_Identifier (Loc, Chars (Entity (Bound)));
|
|
Find_Direct_Name (B);
|
|
|
|
elsif Is_Protected_Type (Ttyp) then
|
|
D := First_Discriminant (Ttyp);
|
|
while Chars (D) /= Chars (Entity (Bound)) loop
|
|
Next_Discriminant (D);
|
|
end loop;
|
|
|
|
B := New_Occurrence_Of (Discriminal (D), Loc);
|
|
|
|
else
|
|
B := New_Occurrence_Of (Discriminal (Entity (Bound)), Loc);
|
|
end if;
|
|
|
|
elsif Nkind (Bound) = N_Attribute_Reference then
|
|
return Bound;
|
|
|
|
else
|
|
B := New_Copy_Tree (Bound);
|
|
end if;
|
|
|
|
return
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Pos,
|
|
Prefix => New_Occurrence_Of (Etype (Bound), Loc),
|
|
Expressions => New_List (B));
|
|
end Convert_Discriminant_Ref;
|
|
|
|
-- Start of processing for Family_Offset
|
|
|
|
begin
|
|
Real_Hi := Convert_Discriminant_Ref (Hi);
|
|
Real_Lo := Convert_Discriminant_Ref (Lo);
|
|
|
|
if Cap then
|
|
if Is_Task_Type (Ttyp) then
|
|
Ityp := RTE (RE_Task_Entry_Index);
|
|
else
|
|
Ityp := RTE (RE_Protected_Entry_Index);
|
|
end if;
|
|
|
|
Real_Hi :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Ityp, Loc),
|
|
Attribute_Name => Name_Min,
|
|
Expressions => New_List (
|
|
Real_Hi,
|
|
Make_Integer_Literal (Loc, Entry_Family_Bound - 1)));
|
|
|
|
Real_Lo :=
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Ityp, Loc),
|
|
Attribute_Name => Name_Max,
|
|
Expressions => New_List (
|
|
Real_Lo,
|
|
Make_Integer_Literal (Loc, -Entry_Family_Bound)));
|
|
end if;
|
|
|
|
return Make_Op_Subtract (Loc, Real_Hi, Real_Lo);
|
|
end Family_Offset;
|
|
|
|
-----------------
|
|
-- Family_Size --
|
|
-----------------
|
|
|
|
function Family_Size
|
|
(Loc : Source_Ptr;
|
|
Hi : Node_Id;
|
|
Lo : Node_Id;
|
|
Ttyp : Entity_Id;
|
|
Cap : Boolean) return Node_Id
|
|
is
|
|
Ityp : Entity_Id;
|
|
|
|
begin
|
|
if Is_Task_Type (Ttyp) then
|
|
Ityp := RTE (RE_Task_Entry_Index);
|
|
else
|
|
Ityp := RTE (RE_Protected_Entry_Index);
|
|
end if;
|
|
|
|
return
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Ityp, Loc),
|
|
Attribute_Name => Name_Max,
|
|
Expressions => New_List (
|
|
Make_Op_Add (Loc,
|
|
Left_Opnd => Family_Offset (Loc, Hi, Lo, Ttyp, Cap),
|
|
Right_Opnd => Make_Integer_Literal (Loc, 1)),
|
|
Make_Integer_Literal (Loc, 0)));
|
|
end Family_Size;
|
|
|
|
----------------------------
|
|
-- Find_Enclosing_Context --
|
|
----------------------------
|
|
|
|
procedure Find_Enclosing_Context
|
|
(N : Node_Id;
|
|
Context : out Node_Id;
|
|
Context_Id : out Entity_Id;
|
|
Context_Decls : out List_Id)
|
|
is
|
|
begin
|
|
-- Traverse the parent chain looking for an enclosing body, block,
|
|
-- package or return statement.
|
|
|
|
Context := Parent (N);
|
|
while Present (Context) loop
|
|
if Nkind_In (Context, N_Entry_Body,
|
|
N_Extended_Return_Statement,
|
|
N_Package_Body,
|
|
N_Package_Declaration,
|
|
N_Subprogram_Body,
|
|
N_Task_Body)
|
|
then
|
|
exit;
|
|
|
|
-- Do not consider block created to protect a list of statements with
|
|
-- an Abort_Defer / Abort_Undefer_Direct pair.
|
|
|
|
elsif Nkind (Context) = N_Block_Statement
|
|
and then not Is_Abort_Block (Context)
|
|
then
|
|
exit;
|
|
end if;
|
|
|
|
Context := Parent (Context);
|
|
end loop;
|
|
|
|
pragma Assert (Present (Context));
|
|
|
|
-- Extract the constituents of the context
|
|
|
|
if Nkind (Context) = N_Extended_Return_Statement then
|
|
Context_Decls := Return_Object_Declarations (Context);
|
|
Context_Id := Return_Statement_Entity (Context);
|
|
|
|
-- Package declarations and bodies use a common library-level activation
|
|
-- chain or task master, therefore return the package declaration as the
|
|
-- proper carrier for the appropriate flag.
|
|
|
|
elsif Nkind (Context) = N_Package_Body then
|
|
Context_Decls := Declarations (Context);
|
|
Context_Id := Corresponding_Spec (Context);
|
|
Context := Parent (Context_Id);
|
|
|
|
if Nkind (Context) = N_Defining_Program_Unit_Name then
|
|
Context := Parent (Parent (Context));
|
|
else
|
|
Context := Parent (Context);
|
|
end if;
|
|
|
|
elsif Nkind (Context) = N_Package_Declaration then
|
|
Context_Decls := Visible_Declarations (Specification (Context));
|
|
Context_Id := Defining_Unit_Name (Specification (Context));
|
|
|
|
if Nkind (Context_Id) = N_Defining_Program_Unit_Name then
|
|
Context_Id := Defining_Identifier (Context_Id);
|
|
end if;
|
|
|
|
else
|
|
if Nkind (Context) = N_Block_Statement then
|
|
Context_Id := Entity (Identifier (Context));
|
|
|
|
elsif Nkind (Context) = N_Entry_Body then
|
|
Context_Id := Defining_Identifier (Context);
|
|
|
|
elsif Nkind (Context) = N_Subprogram_Body then
|
|
if Present (Corresponding_Spec (Context)) then
|
|
Context_Id := Corresponding_Spec (Context);
|
|
else
|
|
Context_Id := Defining_Unit_Name (Specification (Context));
|
|
|
|
if Nkind (Context_Id) = N_Defining_Program_Unit_Name then
|
|
Context_Id := Defining_Identifier (Context_Id);
|
|
end if;
|
|
end if;
|
|
|
|
elsif Nkind (Context) = N_Task_Body then
|
|
Context_Id := Corresponding_Spec (Context);
|
|
|
|
else
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
Context_Decls := Declarations (Context);
|
|
end if;
|
|
|
|
pragma Assert (Present (Context_Id));
|
|
pragma Assert (Present (Context_Decls));
|
|
end Find_Enclosing_Context;
|
|
|
|
-----------------------
|
|
-- Find_Master_Scope --
|
|
-----------------------
|
|
|
|
function Find_Master_Scope (E : Entity_Id) return Entity_Id is
|
|
S : Entity_Id;
|
|
|
|
begin
|
|
-- In Ada 2005, the master is the innermost enclosing scope that is not
|
|
-- transient. If the enclosing block is the rewriting of a call or the
|
|
-- scope is an extended return statement this is valid master. The
|
|
-- master in an extended return is only used within the return, and is
|
|
-- subsequently overwritten in Move_Activation_Chain, but it must exist
|
|
-- now before that overwriting occurs.
|
|
|
|
S := Scope (E);
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
while Is_Internal (S) loop
|
|
if Nkind (Parent (S)) = N_Block_Statement
|
|
and then
|
|
Nkind (Original_Node (Parent (S))) = N_Procedure_Call_Statement
|
|
then
|
|
exit;
|
|
|
|
elsif Ekind (S) = E_Return_Statement then
|
|
exit;
|
|
|
|
else
|
|
S := Scope (S);
|
|
end if;
|
|
end loop;
|
|
end if;
|
|
|
|
return S;
|
|
end Find_Master_Scope;
|
|
|
|
-------------------------------
|
|
-- First_Protected_Operation --
|
|
-------------------------------
|
|
|
|
function First_Protected_Operation (D : List_Id) return Node_Id is
|
|
First_Op : Node_Id;
|
|
|
|
begin
|
|
First_Op := First (D);
|
|
while Present (First_Op)
|
|
and then not Nkind_In (First_Op, N_Subprogram_Body, N_Entry_Body)
|
|
loop
|
|
Next (First_Op);
|
|
end loop;
|
|
|
|
return First_Op;
|
|
end First_Protected_Operation;
|
|
|
|
---------------------------------------
|
|
-- Install_Private_Data_Declarations --
|
|
---------------------------------------
|
|
|
|
procedure Install_Private_Data_Declarations
|
|
(Loc : Source_Ptr;
|
|
Spec_Id : Entity_Id;
|
|
Conc_Typ : Entity_Id;
|
|
Body_Nod : Node_Id;
|
|
Decls : List_Id;
|
|
Barrier : Boolean := False;
|
|
Family : Boolean := False)
|
|
is
|
|
Is_Protected : constant Boolean := Is_Protected_Type (Conc_Typ);
|
|
Decl : Node_Id;
|
|
Def : Node_Id;
|
|
Insert_Node : Node_Id := Empty;
|
|
Obj_Ent : Entity_Id;
|
|
|
|
procedure Add (Decl : Node_Id);
|
|
-- Add a single declaration after Insert_Node. If this is the first
|
|
-- addition, Decl is added to the front of Decls and it becomes the
|
|
-- insertion node.
|
|
|
|
function Replace_Bound (Bound : Node_Id) return Node_Id;
|
|
-- The bounds of an entry index may depend on discriminants, create a
|
|
-- reference to the corresponding prival. Otherwise return a duplicate
|
|
-- of the original bound.
|
|
|
|
---------
|
|
-- Add --
|
|
---------
|
|
|
|
procedure Add (Decl : Node_Id) is
|
|
begin
|
|
if No (Insert_Node) then
|
|
Prepend_To (Decls, Decl);
|
|
else
|
|
Insert_After (Insert_Node, Decl);
|
|
end if;
|
|
|
|
Insert_Node := Decl;
|
|
end Add;
|
|
|
|
--------------------------
|
|
-- Replace_Discriminant --
|
|
--------------------------
|
|
|
|
function Replace_Bound (Bound : Node_Id) return Node_Id is
|
|
begin
|
|
if Nkind (Bound) = N_Identifier
|
|
and then Is_Discriminal (Entity (Bound))
|
|
then
|
|
return Make_Identifier (Loc, Chars (Entity (Bound)));
|
|
else
|
|
return Duplicate_Subexpr (Bound);
|
|
end if;
|
|
end Replace_Bound;
|
|
|
|
-- Start of processing for Install_Private_Data_Declarations
|
|
|
|
begin
|
|
-- Step 1: Retrieve the concurrent object entity. Obj_Ent can denote
|
|
-- formal parameter _O, _object or _task depending on the context.
|
|
|
|
Obj_Ent := Concurrent_Object (Spec_Id, Conc_Typ);
|
|
|
|
-- Special processing of _O for barrier functions, protected entries
|
|
-- and families.
|
|
|
|
if Barrier
|
|
or else
|
|
(Is_Protected
|
|
and then
|
|
(Ekind (Spec_Id) = E_Entry
|
|
or else Ekind (Spec_Id) = E_Entry_Family))
|
|
then
|
|
declare
|
|
Conc_Rec : constant Entity_Id :=
|
|
Corresponding_Record_Type (Conc_Typ);
|
|
Typ_Id : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
New_External_Name (Chars (Conc_Rec), 'P'));
|
|
begin
|
|
-- Generate:
|
|
-- type prot_typVP is access prot_typV;
|
|
|
|
Decl :=
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Typ_Id,
|
|
Type_Definition =>
|
|
Make_Access_To_Object_Definition (Loc,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (Conc_Rec, Loc)));
|
|
Add (Decl);
|
|
|
|
-- Generate:
|
|
-- _object : prot_typVP := prot_typV (_O);
|
|
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_uObject),
|
|
Object_Definition => New_Occurrence_Of (Typ_Id, Loc),
|
|
Expression =>
|
|
Unchecked_Convert_To (Typ_Id,
|
|
New_Occurrence_Of (Obj_Ent, Loc)));
|
|
Add (Decl);
|
|
|
|
-- Set the reference to the concurrent object
|
|
|
|
Obj_Ent := Defining_Identifier (Decl);
|
|
end;
|
|
end if;
|
|
|
|
-- Step 2: Create the Protection object and build its declaration for
|
|
-- any protected entry (family) of subprogram. Note for the lock-free
|
|
-- implementation, the Protection object is not needed anymore.
|
|
|
|
if Is_Protected and then not Uses_Lock_Free (Conc_Typ) then
|
|
declare
|
|
Prot_Ent : constant Entity_Id := Make_Temporary (Loc, 'R');
|
|
Prot_Typ : RE_Id;
|
|
|
|
begin
|
|
Set_Protection_Object (Spec_Id, Prot_Ent);
|
|
|
|
-- Determine the proper protection type
|
|
|
|
if Has_Attach_Handler (Conc_Typ)
|
|
and then not Restricted_Profile
|
|
then
|
|
Prot_Typ := RE_Static_Interrupt_Protection;
|
|
|
|
elsif Has_Interrupt_Handler (Conc_Typ)
|
|
and then not Restriction_Active (No_Dynamic_Attachment)
|
|
then
|
|
Prot_Typ := RE_Dynamic_Interrupt_Protection;
|
|
|
|
else
|
|
case Corresponding_Runtime_Package (Conc_Typ) is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Prot_Typ := RE_Protection_Entries;
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Prot_Typ := RE_Protection_Entry;
|
|
|
|
when System_Tasking_Protected_Objects =>
|
|
Prot_Typ := RE_Protection;
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- conc_typR : protection_typ renames _object._object;
|
|
|
|
Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => Prot_Ent,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (RTE (Prot_Typ), Loc),
|
|
Name =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Occurrence_Of (Obj_Ent, Loc),
|
|
Selector_Name => Make_Identifier (Loc, Name_uObject)));
|
|
Add (Decl);
|
|
end;
|
|
end if;
|
|
|
|
-- Step 3: Add discriminant renamings (if any)
|
|
|
|
if Has_Discriminants (Conc_Typ) then
|
|
declare
|
|
D : Entity_Id;
|
|
|
|
begin
|
|
D := First_Discriminant (Conc_Typ);
|
|
while Present (D) loop
|
|
|
|
-- Adjust the source location
|
|
|
|
Set_Sloc (Discriminal (D), Loc);
|
|
|
|
-- Generate:
|
|
-- discr_name : discr_typ renames _object.discr_name;
|
|
-- or
|
|
-- discr_name : discr_typ renames _task.discr_name;
|
|
|
|
Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => Discriminal (D),
|
|
Subtype_Mark => New_Occurrence_Of (Etype (D), Loc),
|
|
Name =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => New_Occurrence_Of (Obj_Ent, Loc),
|
|
Selector_Name => Make_Identifier (Loc, Chars (D))));
|
|
Add (Decl);
|
|
|
|
Next_Discriminant (D);
|
|
end loop;
|
|
end;
|
|
end if;
|
|
|
|
-- Step 4: Add private component renamings (if any)
|
|
|
|
if Is_Protected then
|
|
Def := Protected_Definition (Parent (Conc_Typ));
|
|
|
|
if Present (Private_Declarations (Def)) then
|
|
declare
|
|
Comp : Node_Id;
|
|
Comp_Id : Entity_Id;
|
|
Decl_Id : Entity_Id;
|
|
|
|
begin
|
|
Comp := First (Private_Declarations (Def));
|
|
while Present (Comp) loop
|
|
if Nkind (Comp) = N_Component_Declaration then
|
|
Comp_Id := Defining_Identifier (Comp);
|
|
Decl_Id :=
|
|
Make_Defining_Identifier (Loc, Chars (Comp_Id));
|
|
|
|
-- Minimal decoration
|
|
|
|
if Ekind (Spec_Id) = E_Function then
|
|
Set_Ekind (Decl_Id, E_Constant);
|
|
else
|
|
Set_Ekind (Decl_Id, E_Variable);
|
|
end if;
|
|
|
|
Set_Prival (Comp_Id, Decl_Id);
|
|
Set_Prival_Link (Decl_Id, Comp_Id);
|
|
Set_Is_Aliased (Decl_Id, Is_Aliased (Comp_Id));
|
|
|
|
-- Generate:
|
|
-- comp_name : comp_typ renames _object.comp_name;
|
|
|
|
Decl :=
|
|
Make_Object_Renaming_Declaration (Loc,
|
|
Defining_Identifier => Decl_Id,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Etype (Comp_Id), Loc),
|
|
Name =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Obj_Ent, Loc),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Chars (Comp_Id))));
|
|
Add (Decl);
|
|
end if;
|
|
|
|
Next (Comp);
|
|
end loop;
|
|
end;
|
|
end if;
|
|
end if;
|
|
|
|
-- Step 5: Add the declaration of the entry index and the associated
|
|
-- type for barrier functions and entry families.
|
|
|
|
if (Barrier and Family) or else Ekind (Spec_Id) = E_Entry_Family then
|
|
declare
|
|
E : constant Entity_Id := Index_Object (Spec_Id);
|
|
Index : constant Entity_Id :=
|
|
Defining_Identifier
|
|
(Entry_Index_Specification
|
|
(Entry_Body_Formal_Part (Body_Nod)));
|
|
Index_Con : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, Chars (Index));
|
|
High : Node_Id;
|
|
Index_Typ : Entity_Id;
|
|
Low : Node_Id;
|
|
|
|
begin
|
|
-- Minimal decoration
|
|
|
|
Set_Ekind (Index_Con, E_Constant);
|
|
Set_Entry_Index_Constant (Index, Index_Con);
|
|
Set_Discriminal_Link (Index_Con, Index);
|
|
|
|
-- Retrieve the bounds of the entry family
|
|
|
|
High := Type_High_Bound (Etype (Index));
|
|
Low := Type_Low_Bound (Etype (Index));
|
|
|
|
-- In the simple case the entry family is given by a subtype
|
|
-- mark and the index constant has the same type.
|
|
|
|
if Is_Entity_Name (Original_Node (
|
|
Discrete_Subtype_Definition (Parent (Index))))
|
|
then
|
|
Index_Typ := Etype (Index);
|
|
|
|
-- Otherwise a new subtype declaration is required
|
|
|
|
else
|
|
High := Replace_Bound (High);
|
|
Low := Replace_Bound (Low);
|
|
|
|
Index_Typ := Make_Temporary (Loc, 'J');
|
|
|
|
-- Generate:
|
|
-- subtype Jnn is <Etype of Index> range Low .. High;
|
|
|
|
Decl :=
|
|
Make_Subtype_Declaration (Loc,
|
|
Defining_Identifier => Index_Typ,
|
|
Subtype_Indication =>
|
|
Make_Subtype_Indication (Loc,
|
|
Subtype_Mark =>
|
|
New_Occurrence_Of (Base_Type (Etype (Index)), Loc),
|
|
Constraint =>
|
|
Make_Range_Constraint (Loc,
|
|
Range_Expression =>
|
|
Make_Range (Loc, Low, High))));
|
|
Add (Decl);
|
|
end if;
|
|
|
|
Set_Etype (Index_Con, Index_Typ);
|
|
|
|
-- Create the object which designates the index:
|
|
-- J : constant Jnn :=
|
|
-- Jnn'Val (_E - <index expr> + Jnn'Pos (Jnn'First));
|
|
--
|
|
-- where Jnn is the subtype created above or the original type of
|
|
-- the index, _E is a formal of the protected body subprogram and
|
|
-- <index expr> is the index of the first family member.
|
|
|
|
Decl :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Index_Con,
|
|
Constant_Present => True,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Index_Typ, Loc),
|
|
|
|
Expression =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Index_Typ, Loc),
|
|
Attribute_Name => Name_Val,
|
|
|
|
Expressions => New_List (
|
|
|
|
Make_Op_Add (Loc,
|
|
Left_Opnd =>
|
|
Make_Op_Subtract (Loc,
|
|
Left_Opnd => New_Occurrence_Of (E, Loc),
|
|
Right_Opnd =>
|
|
Entry_Index_Expression (Loc,
|
|
Defining_Identifier (Body_Nod),
|
|
Empty, Conc_Typ)),
|
|
|
|
Right_Opnd =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Index_Typ, Loc),
|
|
Attribute_Name => Name_Pos,
|
|
Expressions => New_List (
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (Index_Typ, Loc),
|
|
Attribute_Name => Name_First)))))));
|
|
Add (Decl);
|
|
end;
|
|
end if;
|
|
end Install_Private_Data_Declarations;
|
|
|
|
-----------------------
|
|
-- Is_Exception_Safe --
|
|
-----------------------
|
|
|
|
function Is_Exception_Safe (Subprogram : Node_Id) return Boolean is
|
|
|
|
function Has_Side_Effect (N : Node_Id) return Boolean;
|
|
-- Return True whenever encountering a subprogram call or raise
|
|
-- statement of any kind in the sequence of statements
|
|
|
|
---------------------
|
|
-- Has_Side_Effect --
|
|
---------------------
|
|
|
|
-- What is this doing buried two levels down in exp_ch9. It seems like a
|
|
-- generally useful function, and indeed there may be code duplication
|
|
-- going on here ???
|
|
|
|
function Has_Side_Effect (N : Node_Id) return Boolean is
|
|
Stmt : Node_Id;
|
|
Expr : Node_Id;
|
|
|
|
function Is_Call_Or_Raise (N : Node_Id) return Boolean;
|
|
-- Indicate whether N is a subprogram call or a raise statement
|
|
|
|
----------------------
|
|
-- Is_Call_Or_Raise --
|
|
----------------------
|
|
|
|
function Is_Call_Or_Raise (N : Node_Id) return Boolean is
|
|
begin
|
|
return Nkind_In (N, N_Procedure_Call_Statement,
|
|
N_Function_Call,
|
|
N_Raise_Statement,
|
|
N_Raise_Constraint_Error,
|
|
N_Raise_Program_Error,
|
|
N_Raise_Storage_Error);
|
|
end Is_Call_Or_Raise;
|
|
|
|
-- Start of processing for Has_Side_Effect
|
|
|
|
begin
|
|
Stmt := N;
|
|
while Present (Stmt) loop
|
|
if Is_Call_Or_Raise (Stmt) then
|
|
return True;
|
|
end if;
|
|
|
|
-- An object declaration can also contain a function call or a
|
|
-- raise statement.
|
|
|
|
if Nkind (Stmt) = N_Object_Declaration then
|
|
Expr := Expression (Stmt);
|
|
|
|
if Present (Expr) and then Is_Call_Or_Raise (Expr) then
|
|
return True;
|
|
end if;
|
|
end if;
|
|
|
|
Next (Stmt);
|
|
end loop;
|
|
|
|
return False;
|
|
end Has_Side_Effect;
|
|
|
|
-- Start of processing for Is_Exception_Safe
|
|
|
|
begin
|
|
-- When exceptions can't be propagated, the subprogram returns normally
|
|
|
|
if No_Exception_Handlers_Set then
|
|
return True;
|
|
end if;
|
|
|
|
-- If the checks handled by the back end are not disabled, we cannot
|
|
-- ensure that no exception will be raised.
|
|
|
|
if not Access_Checks_Suppressed (Empty)
|
|
or else not Discriminant_Checks_Suppressed (Empty)
|
|
or else not Range_Checks_Suppressed (Empty)
|
|
or else not Index_Checks_Suppressed (Empty)
|
|
or else Opt.Stack_Checking_Enabled
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
if Has_Side_Effect (First (Declarations (Subprogram)))
|
|
or else
|
|
Has_Side_Effect
|
|
(First (Statements (Handled_Statement_Sequence (Subprogram))))
|
|
then
|
|
return False;
|
|
else
|
|
return True;
|
|
end if;
|
|
end Is_Exception_Safe;
|
|
|
|
---------------------------------
|
|
-- Is_Potentially_Large_Family --
|
|
---------------------------------
|
|
|
|
function Is_Potentially_Large_Family
|
|
(Base_Index : Entity_Id;
|
|
Conctyp : Entity_Id;
|
|
Lo : Node_Id;
|
|
Hi : Node_Id) return Boolean
|
|
is
|
|
begin
|
|
return Scope (Base_Index) = Standard_Standard
|
|
and then Base_Index = Base_Type (Standard_Integer)
|
|
and then Has_Discriminants (Conctyp)
|
|
and then
|
|
Present (Discriminant_Default_Value (First_Discriminant (Conctyp)))
|
|
and then
|
|
(Denotes_Discriminant (Lo, True)
|
|
or else
|
|
Denotes_Discriminant (Hi, True));
|
|
end Is_Potentially_Large_Family;
|
|
|
|
-------------------------------------
|
|
-- Is_Private_Primitive_Subprogram --
|
|
-------------------------------------
|
|
|
|
function Is_Private_Primitive_Subprogram (Id : Entity_Id) return Boolean is
|
|
begin
|
|
return
|
|
(Ekind (Id) = E_Function or else Ekind (Id) = E_Procedure)
|
|
and then Is_Private_Primitive (Id);
|
|
end Is_Private_Primitive_Subprogram;
|
|
|
|
------------------
|
|
-- Index_Object --
|
|
------------------
|
|
|
|
function Index_Object (Spec_Id : Entity_Id) return Entity_Id is
|
|
Bod_Subp : constant Entity_Id := Protected_Body_Subprogram (Spec_Id);
|
|
Formal : Entity_Id;
|
|
|
|
begin
|
|
Formal := First_Formal (Bod_Subp);
|
|
while Present (Formal) loop
|
|
|
|
-- Look for formal parameter _E
|
|
|
|
if Chars (Formal) = Name_uE then
|
|
return Formal;
|
|
end if;
|
|
|
|
Next_Formal (Formal);
|
|
end loop;
|
|
|
|
-- A protected body subprogram should always have the parameter in
|
|
-- question.
|
|
|
|
raise Program_Error;
|
|
end Index_Object;
|
|
|
|
--------------------------------
|
|
-- Make_Initialize_Protection --
|
|
--------------------------------
|
|
|
|
function Make_Initialize_Protection
|
|
(Protect_Rec : Entity_Id) return List_Id
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (Protect_Rec);
|
|
P_Arr : Entity_Id;
|
|
Pdec : Node_Id;
|
|
Ptyp : constant Node_Id :=
|
|
Corresponding_Concurrent_Type (Protect_Rec);
|
|
Args : List_Id;
|
|
L : constant List_Id := New_List;
|
|
Has_Entry : constant Boolean := Has_Entries (Ptyp);
|
|
Prio_Type : Entity_Id;
|
|
Prio_Var : Entity_Id := Empty;
|
|
Restricted : constant Boolean := Restricted_Profile;
|
|
|
|
begin
|
|
-- We may need two calls to properly initialize the object, one to
|
|
-- Initialize_Protection, and possibly one to Install_Handlers if we
|
|
-- have a pragma Attach_Handler.
|
|
|
|
-- Get protected declaration. In the case of a task type declaration,
|
|
-- this is simply the parent of the protected type entity. In the single
|
|
-- protected object declaration, this parent will be the implicit type,
|
|
-- and we can find the corresponding single protected object declaration
|
|
-- by searching forward in the declaration list in the tree.
|
|
|
|
-- Is the test for N_Single_Protected_Declaration needed here??? Nodes
|
|
-- of this type should have been removed during semantic analysis.
|
|
|
|
Pdec := Parent (Ptyp);
|
|
while not Nkind_In (Pdec, N_Protected_Type_Declaration,
|
|
N_Single_Protected_Declaration)
|
|
loop
|
|
Next (Pdec);
|
|
end loop;
|
|
|
|
-- Build the parameter list for the call. Note that _Init is the name
|
|
-- of the formal for the object to be initialized, which is the task
|
|
-- value record itself.
|
|
|
|
Args := New_List;
|
|
|
|
-- For lock-free implementation, skip initializations of the Protection
|
|
-- object.
|
|
|
|
if not Uses_Lock_Free (Defining_Identifier (Pdec)) then
|
|
|
|
-- Object parameter. This is a pointer to the object of type
|
|
-- Protection used by the GNARL to control the protected object.
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access));
|
|
|
|
-- Priority parameter. Set to Unspecified_Priority unless there is a
|
|
-- Priority rep item, in which case we take the value from the pragma
|
|
-- or attribute definition clause, or there is an Interrupt_Priority
|
|
-- rep item and no Priority rep item, and we set the ceiling to
|
|
-- Interrupt_Priority'Last, an implementation-defined value, see
|
|
-- (RM D.3(10)).
|
|
|
|
if Has_Rep_Item (Ptyp, Name_Priority, Check_Parents => False) then
|
|
declare
|
|
Prio_Clause : constant Node_Id :=
|
|
Get_Rep_Item
|
|
(Ptyp, Name_Priority, Check_Parents => False);
|
|
|
|
Prio : Node_Id;
|
|
|
|
begin
|
|
-- Pragma Priority
|
|
|
|
if Nkind (Prio_Clause) = N_Pragma then
|
|
Prio :=
|
|
Expression
|
|
(First (Pragma_Argument_Associations (Prio_Clause)));
|
|
|
|
-- Get_Rep_Item returns either priority pragma.
|
|
|
|
if Pragma_Name (Prio_Clause) = Name_Priority then
|
|
Prio_Type := RTE (RE_Any_Priority);
|
|
else
|
|
Prio_Type := RTE (RE_Interrupt_Priority);
|
|
end if;
|
|
|
|
-- Attribute definition clause Priority
|
|
|
|
else
|
|
if Chars (Prio_Clause) = Name_Priority then
|
|
Prio_Type := RTE (RE_Any_Priority);
|
|
else
|
|
Prio_Type := RTE (RE_Interrupt_Priority);
|
|
end if;
|
|
|
|
Prio := Expression (Prio_Clause);
|
|
end if;
|
|
|
|
-- Always create a locale variable to capture the priority.
|
|
-- The priority is also passed to Install_Restriced_Handlers.
|
|
-- Note that it is really necessary to create this variable
|
|
-- explicitly. It might be thought that removing side effects
|
|
-- would the appropriate approach, but that could generate
|
|
-- declarations improperly placed in the enclosing scope.
|
|
|
|
Prio_Var := Make_Temporary (Loc, 'R', Prio);
|
|
Append_To (L,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Prio_Var,
|
|
Object_Definition => New_Occurrence_Of (Prio_Type, Loc),
|
|
Expression => Relocate_Node (Prio)));
|
|
|
|
Append_To (Args, New_Occurrence_Of (Prio_Var, Loc));
|
|
end;
|
|
|
|
-- When no priority is specified but an xx_Handler pragma is, we
|
|
-- default to System.Interrupts.Default_Interrupt_Priority, see
|
|
-- D.3(10).
|
|
|
|
elsif Has_Attach_Handler (Ptyp)
|
|
or else Has_Interrupt_Handler (Ptyp)
|
|
then
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Default_Interrupt_Priority), Loc));
|
|
|
|
-- Normal case, no priority or xx_Handler specified, default priority
|
|
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Unspecified_Priority), Loc));
|
|
end if;
|
|
|
|
-- Test for Compiler_Info parameter. This parameter allows entry body
|
|
-- procedures and barrier functions to be called from the runtime. It
|
|
-- is a pointer to the record generated by the compiler to represent
|
|
-- the protected object.
|
|
|
|
-- A protected type without entries that covers an interface and
|
|
-- overrides the abstract routines with protected procedures is
|
|
-- considered equivalent to a protected type with entries in the
|
|
-- context of dispatching select statements.
|
|
|
|
-- Protected types with interrupt handlers (when not using a
|
|
-- restricted profile) are also considered equivalent to protected
|
|
-- types with entries.
|
|
|
|
-- The types which are used (Static_Interrupt_Protection and
|
|
-- Dynamic_Interrupt_Protection) are derived from Protection_Entries.
|
|
|
|
declare
|
|
Pkg_Id : constant RTU_Id := Corresponding_Runtime_Package (Ptyp);
|
|
|
|
Called_Subp : RE_Id;
|
|
|
|
begin
|
|
case Pkg_Id is
|
|
when System_Tasking_Protected_Objects_Entries =>
|
|
Called_Subp := RE_Initialize_Protection_Entries;
|
|
|
|
-- Argument Compiler_Info
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Attribute_Name => Name_Address));
|
|
|
|
when System_Tasking_Protected_Objects_Single_Entry =>
|
|
Called_Subp := RE_Initialize_Protection_Entry;
|
|
|
|
-- Argument Compiler_Info
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Attribute_Name => Name_Address));
|
|
|
|
when System_Tasking_Protected_Objects =>
|
|
Called_Subp := RE_Initialize_Protection;
|
|
|
|
when others =>
|
|
raise Program_Error;
|
|
end case;
|
|
|
|
-- Entry_Bodies parameter. This is a pointer to an array of
|
|
-- pointers to the entry body procedures and barrier functions of
|
|
-- the object. If the protected type has no entries this object
|
|
-- will not exist, in this case, pass a null (it can happen when
|
|
-- there are protected interrupt handlers or interfaces).
|
|
|
|
if Has_Entry then
|
|
P_Arr := Entry_Bodies_Array (Ptyp);
|
|
|
|
-- Argument Entry_Body (for single entry) or Entry_Bodies (for
|
|
-- multiple entries).
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (P_Arr, Loc),
|
|
Attribute_Name => Name_Unrestricted_Access));
|
|
|
|
if Pkg_Id = System_Tasking_Protected_Objects_Entries then
|
|
|
|
-- Find index mapping function (clumsy but ok for now)
|
|
|
|
while Ekind (P_Arr) /= E_Function loop
|
|
Next_Entity (P_Arr);
|
|
end loop;
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (P_Arr, Loc),
|
|
Attribute_Name => Name_Unrestricted_Access));
|
|
end if;
|
|
|
|
elsif Pkg_Id = System_Tasking_Protected_Objects_Single_Entry then
|
|
|
|
-- This is the case where we have a protected object with
|
|
-- interfaces and no entries, and the single entry restriction
|
|
-- is in effect. We pass a null pointer for the entry
|
|
-- parameter because there is no actual entry.
|
|
|
|
Append_To (Args, Make_Null (Loc));
|
|
|
|
elsif Pkg_Id = System_Tasking_Protected_Objects_Entries then
|
|
|
|
-- This is the case where we have a protected object with no
|
|
-- entries and:
|
|
-- - either interrupt handlers with non restricted profile,
|
|
-- - or interfaces
|
|
-- Note that the types which are used for interrupt handlers
|
|
-- (Static/Dynamic_Interrupt_Protection) are derived from
|
|
-- Protection_Entries. We pass two null pointers because there
|
|
-- is no actual entry, and the initialization procedure needs
|
|
-- both Entry_Bodies and Find_Body_Index.
|
|
|
|
Append_To (Args, Make_Null (Loc));
|
|
Append_To (Args, Make_Null (Loc));
|
|
end if;
|
|
|
|
Append_To (L,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (Called_Subp), Loc),
|
|
Parameter_Associations => Args));
|
|
end;
|
|
end if;
|
|
|
|
if Has_Attach_Handler (Ptyp) then
|
|
|
|
-- We have a list of N Attach_Handler (ProcI, ExprI), and we have to
|
|
-- make the following call:
|
|
|
|
-- Install_Handlers (_object,
|
|
-- ((Expr1, Proc1'access), ...., (ExprN, ProcN'access));
|
|
|
|
-- or, in the case of Ravenscar:
|
|
|
|
-- Install_Restricted_Handlers
|
|
-- (Prio, ((Expr1, Proc1'access), ...., (ExprN, ProcN'access)));
|
|
|
|
declare
|
|
Args : constant List_Id := New_List;
|
|
Table : constant List_Id := New_List;
|
|
Ritem : Node_Id := First_Rep_Item (Ptyp);
|
|
|
|
begin
|
|
-- Build the Priority parameter (only for ravenscar)
|
|
|
|
if Restricted then
|
|
|
|
-- Priority comes from a pragma
|
|
|
|
if Present (Prio_Var) then
|
|
Append_To (Args, New_Occurrence_Of (Prio_Var, Loc));
|
|
|
|
-- Priority is the default one
|
|
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of
|
|
(RTE (RE_Default_Interrupt_Priority), Loc));
|
|
end if;
|
|
end if;
|
|
|
|
-- Build the Attach_Handler table argument
|
|
|
|
while Present (Ritem) loop
|
|
if Nkind (Ritem) = N_Pragma
|
|
and then Pragma_Name (Ritem) = Name_Attach_Handler
|
|
then
|
|
declare
|
|
Handler : constant Node_Id :=
|
|
First (Pragma_Argument_Associations (Ritem));
|
|
|
|
Interrupt : constant Node_Id := Next (Handler);
|
|
Expr : constant Node_Id := Expression (Interrupt);
|
|
|
|
begin
|
|
Append_To (Table,
|
|
Make_Aggregate (Loc, Expressions => New_List (
|
|
Unchecked_Convert_To
|
|
(RTE (RE_System_Interrupt_Id), Expr),
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name =>
|
|
Duplicate_Subexpr_No_Checks
|
|
(Expression (Handler))),
|
|
Attribute_Name => Name_Access))));
|
|
end;
|
|
end if;
|
|
|
|
Next_Rep_Item (Ritem);
|
|
end loop;
|
|
|
|
-- Append the table argument we just built
|
|
|
|
Append_To (Args, Make_Aggregate (Loc, Table));
|
|
|
|
-- Append the Install_Handlers (or Install_Restricted_Handlers)
|
|
-- call to the statements.
|
|
|
|
if Restricted then
|
|
-- Call a simplified version of Install_Handlers to be used
|
|
-- when the Ravenscar restrictions are in effect
|
|
-- (Install_Restricted_Handlers).
|
|
|
|
Append_To (L,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of
|
|
(RTE (RE_Install_Restricted_Handlers), Loc),
|
|
Parameter_Associations => Args));
|
|
|
|
else
|
|
if not Uses_Lock_Free (Defining_Identifier (Pdec)) then
|
|
|
|
-- First, prepends the _object argument
|
|
|
|
Prepend_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Name_uObject)),
|
|
Attribute_Name => Name_Unchecked_Access));
|
|
end if;
|
|
|
|
-- Then, insert call to Install_Handlers
|
|
|
|
Append_To (L,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Occurrence_Of (RTE (RE_Install_Handlers), Loc),
|
|
Parameter_Associations => Args));
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
return L;
|
|
end Make_Initialize_Protection;
|
|
|
|
---------------------------
|
|
-- Make_Task_Create_Call --
|
|
---------------------------
|
|
|
|
function Make_Task_Create_Call (Task_Rec : Entity_Id) return Node_Id is
|
|
Loc : constant Source_Ptr := Sloc (Task_Rec);
|
|
Args : List_Id;
|
|
Ecount : Node_Id;
|
|
Name : Node_Id;
|
|
Tdec : Node_Id;
|
|
Tdef : Node_Id;
|
|
Tnam : Name_Id;
|
|
Ttyp : Node_Id;
|
|
|
|
begin
|
|
Ttyp := Corresponding_Concurrent_Type (Task_Rec);
|
|
Tnam := Chars (Ttyp);
|
|
|
|
-- Get task declaration. In the case of a task type declaration, this is
|
|
-- simply the parent of the task type entity. In the single task
|
|
-- declaration, this parent will be the implicit type, and we can find
|
|
-- the corresponding single task declaration by searching forward in the
|
|
-- declaration list in the tree.
|
|
|
|
-- Is the test for N_Single_Task_Declaration needed here??? Nodes of
|
|
-- this type should have been removed during semantic analysis.
|
|
|
|
Tdec := Parent (Ttyp);
|
|
while not Nkind_In (Tdec, N_Task_Type_Declaration,
|
|
N_Single_Task_Declaration)
|
|
loop
|
|
Next (Tdec);
|
|
end loop;
|
|
|
|
-- Now we can find the task definition from this declaration
|
|
|
|
Tdef := Task_Definition (Tdec);
|
|
|
|
-- Build the parameter list for the call. Note that _Init is the name
|
|
-- of the formal for the object to be initialized, which is the task
|
|
-- value record itself.
|
|
|
|
Args := New_List;
|
|
|
|
-- Priority parameter. Set to Unspecified_Priority unless there is a
|
|
-- Priority rep item, in which case we take the value from the rep item.
|
|
|
|
if Has_Rep_Item (Ttyp, Name_Priority, Check_Parents => False) then
|
|
Append_To (Args,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uPriority)));
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Unspecified_Priority), Loc));
|
|
end if;
|
|
|
|
-- Optional Stack parameter
|
|
|
|
if Restricted_Profile then
|
|
|
|
-- If the stack has been preallocated by the expander then
|
|
-- pass its address. Otherwise, pass a null address.
|
|
|
|
if Preallocated_Stacks_On_Target then
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uStack)),
|
|
Attribute_Name => Name_Address));
|
|
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Null_Address), Loc));
|
|
end if;
|
|
end if;
|
|
|
|
-- Size parameter. If no Storage_Size pragma is present, then
|
|
-- the size is taken from the taskZ variable for the type, which
|
|
-- is either Unspecified_Size, or has been reset by the use of
|
|
-- a Storage_Size attribute definition clause. If a pragma is
|
|
-- present, then the size is taken from the _Size field of the
|
|
-- task value record, which was set from the pragma value.
|
|
|
|
if Present (Tdef) and then Has_Storage_Size_Pragma (Tdef) then
|
|
Append_To (Args,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uSize)));
|
|
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (Storage_Size_Variable (Ttyp), Loc));
|
|
end if;
|
|
|
|
-- Task_Info parameter. Set to Unspecified_Task_Info unless there is a
|
|
-- Task_Info pragma, in which case we take the value from the pragma.
|
|
|
|
if Has_Rep_Pragma (Ttyp, Name_Task_Info, Check_Parents => False) then
|
|
Append_To (Args,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uTask_Info)));
|
|
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Unspecified_Task_Info), Loc));
|
|
end if;
|
|
|
|
-- CPU parameter. Set to Unspecified_CPU unless there is a CPU rep item,
|
|
-- in which case we take the value from the rep item. The parameter is
|
|
-- passed as an Integer because in the case of unspecified CPU the
|
|
-- value is not in the range of CPU_Range.
|
|
|
|
if Has_Rep_Item (Ttyp, Name_CPU, Check_Parents => False) then
|
|
Append_To (Args,
|
|
Convert_To (Standard_Integer,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uCPU))));
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Unspecified_CPU), Loc));
|
|
end if;
|
|
|
|
if not Restricted_Profile then
|
|
|
|
-- Deadline parameter. If no Relative_Deadline pragma is present,
|
|
-- then the deadline is Time_Span_Zero. If a pragma is present, then
|
|
-- the deadline is taken from the _Relative_Deadline field of the
|
|
-- task value record, which was set from the pragma value. Note that
|
|
-- this parameter must not be generated for the restricted profiles
|
|
-- since Ravenscar does not allow deadlines.
|
|
|
|
-- Case where pragma Relative_Deadline applies: use given value
|
|
|
|
if Present (Tdef) and then Has_Relative_Deadline_Pragma (Tdef) then
|
|
Append_To (Args,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Name_uRelative_Deadline)));
|
|
|
|
-- No pragma Relative_Deadline apply to the task
|
|
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Time_Span_Zero), Loc));
|
|
end if;
|
|
|
|
-- Dispatching_Domain parameter. If no Dispatching_Domain rep item is
|
|
-- present, then the dispatching domain is null. If a rep item is
|
|
-- present, then the dispatching domain is taken from the
|
|
-- _Dispatching_Domain field of the task value record, which was set
|
|
-- from the rep item value.
|
|
|
|
-- Case where Dispatching_Domain rep item applies: use given value
|
|
|
|
if Has_Rep_Item
|
|
(Ttyp, Name_Dispatching_Domain, Check_Parents => False)
|
|
then
|
|
Append_To (Args,
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Name_uDispatching_Domain)));
|
|
|
|
-- No pragma or aspect Dispatching_Domain applies to the task
|
|
|
|
else
|
|
Append_To (Args, Make_Null (Loc));
|
|
end if;
|
|
|
|
-- Number of entries. This is an expression of the form:
|
|
|
|
-- n + _Init.a'Length + _Init.a'B'Length + ...
|
|
|
|
-- where a,b... are the entry family names for the task definition
|
|
|
|
Ecount :=
|
|
Build_Entry_Count_Expression
|
|
(Ttyp,
|
|
Component_Items
|
|
(Component_List
|
|
(Type_Definition
|
|
(Parent (Corresponding_Record_Type (Ttyp))))),
|
|
Loc);
|
|
Append_To (Args, Ecount);
|
|
|
|
-- Master parameter. This is a reference to the _Master parameter of
|
|
-- the initialization procedure, except in the case of the pragma
|
|
-- Restrictions (No_Task_Hierarchy) where the value is fixed to
|
|
-- System.Tasking.Library_Task_Level.
|
|
|
|
if Restriction_Active (No_Task_Hierarchy) = False then
|
|
Append_To (Args, Make_Identifier (Loc, Name_uMaster));
|
|
else
|
|
Append_To (Args,
|
|
New_Occurrence_Of (RTE (RE_Library_Task_Level), Loc));
|
|
end if;
|
|
end if;
|
|
|
|
-- State parameter. This is a pointer to the task body procedure. The
|
|
-- required value is obtained by taking 'Unrestricted_Access of the task
|
|
-- body procedure and converting it (with an unchecked conversion) to
|
|
-- the type required by the task kernel. For further details, see the
|
|
-- description of Expand_N_Task_Body. We use 'Unrestricted_Access rather
|
|
-- than 'Address in order to avoid creating trampolines.
|
|
|
|
declare
|
|
Body_Proc : constant Node_Id := Get_Task_Body_Procedure (Ttyp);
|
|
Subp_Ptr_Typ : constant Node_Id :=
|
|
Create_Itype (E_Access_Subprogram_Type, Tdec);
|
|
Ref : constant Node_Id := Make_Itype_Reference (Loc);
|
|
|
|
begin
|
|
Set_Directly_Designated_Type (Subp_Ptr_Typ, Body_Proc);
|
|
Set_Etype (Subp_Ptr_Typ, Subp_Ptr_Typ);
|
|
|
|
-- Be sure to freeze a reference to the access-to-subprogram type,
|
|
-- otherwise gigi will complain that it's in the wrong scope, because
|
|
-- it's actually inside the init procedure for the record type that
|
|
-- corresponds to the task type.
|
|
|
|
Set_Itype (Ref, Subp_Ptr_Typ);
|
|
Append_Freeze_Action (Task_Rec, Ref);
|
|
|
|
Append_To (Args,
|
|
Unchecked_Convert_To (RTE (RE_Task_Procedure_Access),
|
|
Make_Qualified_Expression (Loc,
|
|
Subtype_Mark => New_Occurrence_Of (Subp_Ptr_Typ, Loc),
|
|
Expression =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Body_Proc, Loc),
|
|
Attribute_Name => Name_Unrestricted_Access))));
|
|
end;
|
|
|
|
-- Discriminants parameter. This is just the address of the task
|
|
-- value record itself (which contains the discriminant values
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Attribute_Name => Name_Address));
|
|
|
|
-- Elaborated parameter. This is an access to the elaboration Boolean
|
|
|
|
Append_To (Args,
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => Make_Identifier (Loc, New_External_Name (Tnam, 'E')),
|
|
Attribute_Name => Name_Unchecked_Access));
|
|
|
|
-- Add Chain parameter (not done for sequential elaboration policy, see
|
|
-- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
|
|
|
|
if Partition_Elaboration_Policy /= 'S' then
|
|
Append_To (Args, Make_Identifier (Loc, Name_uChain));
|
|
end if;
|
|
|
|
-- Task name parameter. Take this from the _Task_Id parameter to the
|
|
-- init call unless there is a Task_Name pragma, in which case we take
|
|
-- the value from the pragma.
|
|
|
|
if Has_Rep_Pragma (Ttyp, Name_Task_Name, Check_Parents => False) then
|
|
-- Copy expression in full, because it may be dynamic and have
|
|
-- side effects.
|
|
|
|
Append_To (Args,
|
|
New_Copy_Tree
|
|
(Expression
|
|
(First
|
|
(Pragma_Argument_Associations
|
|
(Get_Rep_Pragma
|
|
(Ttyp, Name_Task_Name, Check_Parents => False))))));
|
|
|
|
else
|
|
Append_To (Args, Make_Identifier (Loc, Name_uTask_Name));
|
|
end if;
|
|
|
|
-- Created_Task parameter. This is the _Task_Id field of the task
|
|
-- record value
|
|
|
|
Append_To (Args,
|
|
Make_Selected_Component (Loc,
|
|
Prefix => Make_Identifier (Loc, Name_uInit),
|
|
Selector_Name => Make_Identifier (Loc, Name_uTask_Id)));
|
|
|
|
declare
|
|
Create_RE : RE_Id;
|
|
|
|
begin
|
|
if Restricted_Profile then
|
|
if Partition_Elaboration_Policy = 'S' then
|
|
Create_RE := RE_Create_Restricted_Task_Sequential;
|
|
else
|
|
Create_RE := RE_Create_Restricted_Task;
|
|
end if;
|
|
else
|
|
Create_RE := RE_Create_Task;
|
|
end if;
|
|
|
|
Name := New_Occurrence_Of (RTE (Create_RE), Loc);
|
|
end;
|
|
|
|
return
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => Name,
|
|
Parameter_Associations => Args);
|
|
end Make_Task_Create_Call;
|
|
|
|
------------------------------
|
|
-- Next_Protected_Operation --
|
|
------------------------------
|
|
|
|
function Next_Protected_Operation (N : Node_Id) return Node_Id is
|
|
Next_Op : Node_Id;
|
|
|
|
begin
|
|
-- Check whether there is a subsequent body for a protected operation
|
|
-- in the current protected body. In Ada2012 that includes expression
|
|
-- functions that are completions.
|
|
|
|
Next_Op := Next (N);
|
|
while Present (Next_Op)
|
|
and then not Nkind_In (Next_Op,
|
|
N_Subprogram_Body, N_Entry_Body, N_Expression_Function)
|
|
loop
|
|
Next (Next_Op);
|
|
end loop;
|
|
|
|
return Next_Op;
|
|
end Next_Protected_Operation;
|
|
|
|
---------------------
|
|
-- Null_Statements --
|
|
---------------------
|
|
|
|
function Null_Statements (Stats : List_Id) return Boolean is
|
|
Stmt : Node_Id;
|
|
|
|
begin
|
|
Stmt := First (Stats);
|
|
while Nkind (Stmt) /= N_Empty
|
|
and then (Nkind_In (Stmt, N_Null_Statement, N_Label)
|
|
or else
|
|
(Nkind (Stmt) = N_Pragma
|
|
and then
|
|
Nam_In (Pragma_Name (Stmt), Name_Unreferenced,
|
|
Name_Unmodified,
|
|
Name_Warnings)))
|
|
loop
|
|
Next (Stmt);
|
|
end loop;
|
|
|
|
return Nkind (Stmt) = N_Empty;
|
|
end Null_Statements;
|
|
|
|
--------------------------
|
|
-- Parameter_Block_Pack --
|
|
--------------------------
|
|
|
|
function Parameter_Block_Pack
|
|
(Loc : Source_Ptr;
|
|
Blk_Typ : Entity_Id;
|
|
Actuals : List_Id;
|
|
Formals : List_Id;
|
|
Decls : List_Id;
|
|
Stmts : List_Id) return Node_Id
|
|
is
|
|
Actual : Entity_Id;
|
|
Expr : Node_Id := Empty;
|
|
Formal : Entity_Id;
|
|
Has_Param : Boolean := False;
|
|
P : Entity_Id;
|
|
Params : List_Id;
|
|
Temp_Asn : Node_Id;
|
|
Temp_Nam : Node_Id;
|
|
|
|
begin
|
|
Actual := First (Actuals);
|
|
Formal := Defining_Identifier (First (Formals));
|
|
Params := New_List;
|
|
while Present (Actual) loop
|
|
if Is_By_Copy_Type (Etype (Actual)) then
|
|
-- Generate:
|
|
-- Jnn : aliased <formal-type>
|
|
|
|
Temp_Nam := Make_Temporary (Loc, 'J');
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Aliased_Present => True,
|
|
Defining_Identifier => Temp_Nam,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Etype (Formal), Loc)));
|
|
|
|
if Ekind (Formal) /= E_Out_Parameter then
|
|
|
|
-- Generate:
|
|
-- Jnn := <actual>
|
|
|
|
Temp_Asn :=
|
|
New_Occurrence_Of (Temp_Nam, Loc);
|
|
|
|
Set_Assignment_OK (Temp_Asn);
|
|
|
|
Append_To (Stmts,
|
|
Make_Assignment_Statement (Loc,
|
|
Name => Temp_Asn,
|
|
Expression => New_Copy_Tree (Actual)));
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- Jnn'unchecked_access
|
|
|
|
Append_To (Params,
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Unchecked_Access,
|
|
Prefix => New_Occurrence_Of (Temp_Nam, Loc)));
|
|
|
|
Has_Param := True;
|
|
|
|
-- The controlling parameter is omitted
|
|
|
|
else
|
|
if not Is_Controlling_Actual (Actual) then
|
|
Append_To (Params,
|
|
Make_Reference (Loc, New_Copy_Tree (Actual)));
|
|
|
|
Has_Param := True;
|
|
end if;
|
|
end if;
|
|
|
|
Next_Actual (Actual);
|
|
Next_Formal_With_Extras (Formal);
|
|
end loop;
|
|
|
|
if Has_Param then
|
|
Expr := Make_Aggregate (Loc, Params);
|
|
end if;
|
|
|
|
-- Generate:
|
|
-- P : Ann := (
|
|
-- J1'unchecked_access;
|
|
-- <actual2>'reference;
|
|
-- ...);
|
|
|
|
P := Make_Temporary (Loc, 'P');
|
|
|
|
Append_To (Decls,
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => P,
|
|
Object_Definition => New_Occurrence_Of (Blk_Typ, Loc),
|
|
Expression => Expr));
|
|
|
|
return P;
|
|
end Parameter_Block_Pack;
|
|
|
|
----------------------------
|
|
-- Parameter_Block_Unpack --
|
|
----------------------------
|
|
|
|
function Parameter_Block_Unpack
|
|
(Loc : Source_Ptr;
|
|
P : Entity_Id;
|
|
Actuals : List_Id;
|
|
Formals : List_Id) return List_Id
|
|
is
|
|
Actual : Entity_Id;
|
|
Asnmt : Node_Id;
|
|
Formal : Entity_Id;
|
|
Has_Asnmt : Boolean := False;
|
|
Result : constant List_Id := New_List;
|
|
|
|
begin
|
|
Actual := First (Actuals);
|
|
Formal := Defining_Identifier (First (Formals));
|
|
while Present (Actual) loop
|
|
if Is_By_Copy_Type (Etype (Actual))
|
|
and then Ekind (Formal) /= E_In_Parameter
|
|
then
|
|
-- Generate:
|
|
-- <actual> := P.<formal>;
|
|
|
|
Asnmt :=
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
New_Copy (Actual),
|
|
Expression =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (P, Loc),
|
|
Selector_Name =>
|
|
Make_Identifier (Loc, Chars (Formal)))));
|
|
|
|
Set_Assignment_OK (Name (Asnmt));
|
|
Append_To (Result, Asnmt);
|
|
|
|
Has_Asnmt := True;
|
|
end if;
|
|
|
|
Next_Actual (Actual);
|
|
Next_Formal_With_Extras (Formal);
|
|
end loop;
|
|
|
|
if Has_Asnmt then
|
|
return Result;
|
|
else
|
|
return New_List (Make_Null_Statement (Loc));
|
|
end if;
|
|
end Parameter_Block_Unpack;
|
|
|
|
----------------------
|
|
-- Set_Discriminals --
|
|
----------------------
|
|
|
|
procedure Set_Discriminals (Dec : Node_Id) is
|
|
D : Entity_Id;
|
|
Pdef : Entity_Id;
|
|
D_Minal : Entity_Id;
|
|
|
|
begin
|
|
pragma Assert (Nkind (Dec) = N_Protected_Type_Declaration);
|
|
Pdef := Defining_Identifier (Dec);
|
|
|
|
if Has_Discriminants (Pdef) then
|
|
D := First_Discriminant (Pdef);
|
|
while Present (D) loop
|
|
D_Minal :=
|
|
Make_Defining_Identifier (Sloc (D),
|
|
Chars => New_External_Name (Chars (D), 'D'));
|
|
|
|
Set_Ekind (D_Minal, E_Constant);
|
|
Set_Etype (D_Minal, Etype (D));
|
|
Set_Scope (D_Minal, Pdef);
|
|
Set_Discriminal (D, D_Minal);
|
|
Set_Discriminal_Link (D_Minal, D);
|
|
|
|
Next_Discriminant (D);
|
|
end loop;
|
|
end if;
|
|
end Set_Discriminals;
|
|
|
|
-----------------------
|
|
-- Trivial_Accept_OK --
|
|
-----------------------
|
|
|
|
function Trivial_Accept_OK return Boolean is
|
|
begin
|
|
case Opt.Task_Dispatching_Policy is
|
|
|
|
-- If we have the default task dispatching policy in effect, we can
|
|
-- definitely do the optimization (one way of looking at this is to
|
|
-- think of the formal definition of the default policy being allowed
|
|
-- to run any task it likes after a rendezvous, so even if notionally
|
|
-- a full rescheduling occurs, we can say that our dispatching policy
|
|
-- (i.e. the default dispatching policy) reorders the queue to be the
|
|
-- same as just before the call.
|
|
|
|
when ' ' =>
|
|
return True;
|
|
|
|
-- FIFO_Within_Priorities certainly does not permit this
|
|
-- optimization since the Rendezvous is a scheduling action that may
|
|
-- require some other task to be run.
|
|
|
|
when 'F' =>
|
|
return False;
|
|
|
|
-- For now, disallow the optimization for all other policies. This
|
|
-- may be over-conservative, but it is certainly not incorrect.
|
|
|
|
when others =>
|
|
return False;
|
|
|
|
end case;
|
|
end Trivial_Accept_OK;
|
|
|
|
end Exp_Ch9;
|