3790 lines
130 KiB
Ada
3790 lines
130 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S E M _ E L A B --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1997-2016, 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 Debug; use Debug;
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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_Tss; use Exp_Tss;
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with Exp_Util; use Exp_Util;
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with Expander; use Expander;
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with Fname; use Fname;
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with Lib; use Lib;
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with Lib.Load; use Lib.Load;
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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 Output; use Output;
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with Restrict; use Restrict;
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with Rident; use Rident;
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with Sem; use Sem;
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with Sem_Aux; use Sem_Aux;
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with Sem_Cat; use Sem_Cat;
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with Sem_Ch7; use Sem_Ch7;
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with Sem_Ch8; use Sem_Ch8;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Sinput; use Sinput;
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with Snames; use Snames;
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with Stand; use Stand;
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with Table;
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with Tbuild; use Tbuild;
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with Uintp; use Uintp;
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with Uname; use Uname;
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package body Sem_Elab is
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-- The following table records the recursive call chain for output in the
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-- Output routine. Each entry records the call node and the entity of the
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-- called routine. The number of entries in the table (i.e. the value of
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-- Elab_Call.Last) indicates the current depth of recursion and is used to
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-- identify the outer level.
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type Elab_Call_Entry is record
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Cloc : Source_Ptr;
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Ent : Entity_Id;
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end record;
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package Elab_Call is new Table.Table (
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Table_Component_Type => Elab_Call_Entry,
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Table_Index_Type => Int,
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Table_Low_Bound => 1,
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Table_Initial => 50,
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Table_Increment => 100,
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Table_Name => "Elab_Call");
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-- This table is initialized at the start of each outer level call. It
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-- holds the entities for all subprograms that have been examined for this
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-- particular outer level call, and is used to prevent both infinite
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-- recursion, and useless reanalysis of bodies already seen
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package Elab_Visited is new Table.Table (
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Table_Component_Type => Entity_Id,
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Table_Index_Type => Int,
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Table_Low_Bound => 1,
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Table_Initial => 200,
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Table_Increment => 100,
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Table_Name => "Elab_Visited");
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-- This table stores calls to Check_Internal_Call that are delayed until
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-- all generics are instantiated and in particular until after all generic
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-- bodies have been inserted. We need to delay, because we need to be able
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-- to look through the inserted bodies.
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type Delay_Element is record
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N : Node_Id;
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-- The parameter N from the call to Check_Internal_Call. Note that this
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-- node may get rewritten over the delay period by expansion in the call
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-- case (but not in the instantiation case).
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E : Entity_Id;
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-- The parameter E from the call to Check_Internal_Call
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Orig_Ent : Entity_Id;
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-- The parameter Orig_Ent from the call to Check_Internal_Call
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Curscop : Entity_Id;
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-- The current scope of the call. This is restored when we complete the
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-- delayed call, so that we do this in the right scope.
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From_Elab_Code : Boolean;
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-- Save indication of whether this call is from elaboration code
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Outer_Scope : Entity_Id;
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-- Save scope of outer level call
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end record;
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package Delay_Check is new Table.Table (
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Table_Component_Type => Delay_Element,
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Table_Index_Type => Int,
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Table_Low_Bound => 1,
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Table_Initial => 1000,
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Table_Increment => 100,
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Table_Name => "Delay_Check");
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C_Scope : Entity_Id;
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-- Top-level scope of current scope. Compute this only once at the outer
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-- level, i.e. for a call to Check_Elab_Call from outside this unit.
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Outer_Level_Sloc : Source_Ptr;
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-- Save Sloc value for outer level call node for comparisons of source
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-- locations. A body is too late if it appears after the *outer* level
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-- call, not the particular call that is being analyzed.
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From_Elab_Code : Boolean;
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-- This flag shows whether the outer level call currently being examined
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-- is or is not in elaboration code. We are only interested in calls to
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-- routines in other units if this flag is True.
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In_Task_Activation : Boolean := False;
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-- This flag indicates whether we are performing elaboration checks on
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-- task procedures, at the point of activation. If true, we do not trace
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-- internal calls in these procedures, because all local bodies are known
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-- to be elaborated.
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Delaying_Elab_Checks : Boolean := True;
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-- This is set True till the compilation is complete, including the
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-- insertion of all instance bodies. Then when Check_Elab_Calls is called,
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-- the delay table is used to make the delayed calls and this flag is reset
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-- to False, so that the calls are processed.
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-----------------------
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-- Local Subprograms --
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-----------------------
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-- Note: Outer_Scope in all following specs represents the scope of
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-- interest of the outer level call. If it is set to Standard_Standard,
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-- then it means the outer level call was at elaboration level, and that
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-- thus all calls are of interest. If it was set to some other scope,
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-- then the original call was an inner call, and we are not interested
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-- in calls that go outside this scope.
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procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id);
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-- Analysis of construct N shows that we should set Elaborate_All_Desirable
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-- for the WITH clause for unit U (which will always be present). A special
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-- case is when N is a function or procedure instantiation, in which case
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-- it is sufficient to set Elaborate_Desirable, since in this case there is
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-- no possibility of transitive elaboration issues.
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procedure Check_A_Call
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(N : Node_Id;
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E : Entity_Id;
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Outer_Scope : Entity_Id;
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Inter_Unit_Only : Boolean;
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Generate_Warnings : Boolean := True;
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In_Init_Proc : Boolean := False);
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-- This is the internal recursive routine that is called to check for
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-- possible elaboration error. The argument N is a subprogram call or
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-- generic instantiation, or 'Access attribute reference to be checked, and
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-- E is the entity of the called subprogram, or instantiated generic unit,
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-- or subprogram referenced by 'Access.
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--
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-- In SPARK mode, N can also be a variable reference, since in SPARK this
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-- also triggers a requirement for Elaborate_All, and in this case E is the
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-- entity being referenced.
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--
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-- Outer_Scope is the outer level scope for the original reference.
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-- Inter_Unit_Only is set if the call is only to be checked in the
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-- case where it is to another unit (and skipped if within a unit).
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-- Generate_Warnings is set to False to suppress warning messages about
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-- missing pragma Elaborate_All's. These messages are not wanted for
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-- inner calls in the dynamic model. Note that an instance of the Access
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-- attribute applied to a subprogram also generates a call to this
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-- procedure (since the referenced subprogram may be called later
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-- indirectly). Flag In_Init_Proc should be set whenever the current
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-- context is a type init proc.
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--
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-- Note: this might better be called Check_A_Reference to recognize the
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-- variable case for SPARK, but we prefer to retain the historical name
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-- since in practice this is mostly about checking calls for the possible
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-- occurrence of an access-before-elaboration exception.
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procedure Check_Bad_Instantiation (N : Node_Id);
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-- N is a node for an instantiation (if called with any other node kind,
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-- Check_Bad_Instantiation ignores the call). This subprogram checks for
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-- the special case of a generic instantiation of a generic spec in the
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-- same declarative part as the instantiation where a body is present and
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-- has not yet been seen. This is an obvious error, but needs to be checked
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-- specially at the time of the instantiation, since it is a case where we
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-- cannot insert the body anywhere. If this case is detected, warnings are
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-- generated, and a raise of Program_Error is inserted. In addition any
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-- subprograms in the generic spec are stubbed, and the Bad_Instantiation
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-- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
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-- flag as an indication that no attempt should be made to insert an
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-- instance body.
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procedure Check_Internal_Call
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(N : Node_Id;
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E : Entity_Id;
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Outer_Scope : Entity_Id;
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Orig_Ent : Entity_Id);
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-- N is a function call or procedure statement call node and E is the
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-- entity of the called function, which is within the current compilation
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-- unit (where subunits count as part of the parent). This call checks if
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-- this call, or any call within any accessed body could cause an ABE, and
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-- if so, outputs a warning. Orig_Ent differs from E only in the case of
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-- renamings, and points to the original name of the entity. This is used
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-- for error messages. Outer_Scope is the outer level scope for the
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-- original call.
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procedure Check_Internal_Call_Continue
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(N : Node_Id;
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E : Entity_Id;
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Outer_Scope : Entity_Id;
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Orig_Ent : Entity_Id);
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-- The processing for Check_Internal_Call is divided up into two phases,
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-- and this represents the second phase. The second phase is delayed if
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-- Delaying_Elab_Calls is set to True. In this delayed case, the first
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-- phase makes an entry in the Delay_Check table, which is processed when
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-- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
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-- Check_Internal_Call. Outer_Scope is the outer level scope for the
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-- original call.
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function Has_Generic_Body (N : Node_Id) return Boolean;
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-- N is a generic package instantiation node, and this routine determines
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-- if this package spec does in fact have a generic body. If so, then
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-- True is returned, otherwise False. Note that this is not at all the
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-- same as checking if the unit requires a body, since it deals with
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-- the case of optional bodies accurately (i.e. if a body is optional,
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-- then it looks to see if a body is actually present). Note: this
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-- function can only do a fully correct job if in generating code mode
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-- where all bodies have to be present. If we are operating in semantics
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-- check only mode, then in some cases of optional bodies, a result of
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-- False may incorrectly be given. In practice this simply means that
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-- some cases of warnings for incorrect order of elaboration will only
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-- be given when generating code, which is not a big problem (and is
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-- inevitable, given the optional body semantics of Ada).
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procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
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-- Given code for an elaboration check (or unconditional raise if the check
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-- is not needed), inserts the code in the appropriate place. N is the call
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-- or instantiation node for which the check code is required. C is the
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-- test whose failure triggers the raise.
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function Is_Call_Of_Generic_Formal (N : Node_Id) return Boolean;
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-- Returns True if node N is a call to a generic formal subprogram
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function Is_Finalization_Procedure (Id : Entity_Id) return Boolean;
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-- Determine whether entity Id denotes a [Deep_]Finalize procedure
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procedure Output_Calls
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(N : Node_Id;
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Check_Elab_Flag : Boolean);
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-- Outputs chain of calls stored in the Elab_Call table. The caller has
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-- already generated the main warning message, so the warnings generated
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-- are all continuation messages. The argument is the call node at which
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-- the messages are to be placed. When Check_Elab_Flag is set, calls are
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-- enumerated only when flag Elab_Warning is set for the dynamic case or
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-- when flag Elab_Info_Messages is set for the static case.
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function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
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-- Given two scopes, determine whether they are the same scope from an
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-- elaboration point of view, i.e. packages and blocks are ignored.
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procedure Set_C_Scope;
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-- On entry C_Scope is set to some scope. On return, C_Scope is reset
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-- to be the enclosing compilation unit of this scope.
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function Get_Referenced_Ent (N : Node_Id) return Entity_Id;
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-- N is either a function or procedure call or an access attribute that
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-- references a subprogram. This call retrieves the relevant entity. If
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-- this is a call to a protected subprogram, the entity is a selected
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-- component. The callable entity may be absent, in which case Empty is
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-- returned. This happens with non-analyzed calls in nested generics.
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--
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-- If SPARK_Mode is On, then N can also be a reference to an E_Variable
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-- entity, in which case, the value returned is simply this entity.
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procedure Set_Elaboration_Constraint
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(Call : Node_Id;
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Subp : Entity_Id;
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Scop : Entity_Id);
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-- The current unit U may depend semantically on some unit P which is not
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-- in the current context. If there is an elaboration call that reaches P,
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-- we need to indicate that P requires an Elaborate_All, but this is not
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-- effective in U's ali file, if there is no with_clause for P. In this
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-- case we add the Elaborate_All on the unit Q that directly or indirectly
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-- makes P available. This can happen in two cases:
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--
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-- a) Q declares a subtype of a type declared in P, and the call is an
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-- initialization call for an object of that subtype.
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--
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-- b) Q declares an object of some tagged type whose root type is
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-- declared in P, and the initialization call uses object notation on
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-- that object to reach a primitive operation or a classwide operation
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-- declared in P.
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--
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-- If P appears in the context of U, the current processing is correct.
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-- Otherwise we must identify these two cases to retrieve Q and place the
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-- Elaborate_All_Desirable on it.
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function Spec_Entity (E : Entity_Id) return Entity_Id;
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-- Given a compilation unit entity, if it is a spec entity, it is returned
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-- unchanged. If it is a body entity, then the spec for the corresponding
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-- spec is returned
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procedure Supply_Bodies (N : Node_Id);
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-- Given a node, N, that is either a subprogram declaration or a package
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-- declaration, this procedure supplies dummy bodies for the subprogram
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-- or for all subprograms in the package. If the given node is not one of
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-- these two possibilities, then Supply_Bodies does nothing. The dummy body
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-- contains a single Raise statement.
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procedure Supply_Bodies (L : List_Id);
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-- Calls Supply_Bodies for all elements of the given list L
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function Within (E1, E2 : Entity_Id) return Boolean;
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-- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
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-- of its contained scopes, False otherwise.
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function Within_Elaborate_All
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(Unit : Unit_Number_Type;
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E : Entity_Id) return Boolean;
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-- Return True if we are within the scope of an Elaborate_All for E, or if
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-- we are within the scope of an Elaborate_All for some other unit U, and U
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-- with's E. This prevents spurious warnings when the called entity is
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-- renamed within U, or in case of generic instances.
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--------------------------------------
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-- Activate_Elaborate_All_Desirable --
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--------------------------------------
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procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id) is
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UN : constant Unit_Number_Type := Get_Code_Unit (N);
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CU : constant Node_Id := Cunit (UN);
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UE : constant Entity_Id := Cunit_Entity (UN);
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Unm : constant Unit_Name_Type := Unit_Name (UN);
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CI : constant List_Id := Context_Items (CU);
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Itm : Node_Id;
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Ent : Entity_Id;
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procedure Add_To_Context_And_Mark (Itm : Node_Id);
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-- This procedure is called when the elaborate indication must be
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-- applied to a unit not in the context of the referencing unit. The
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-- unit gets added to the context as an implicit with.
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function In_Withs_Of (UEs : Entity_Id) return Boolean;
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-- UEs is the spec entity of a unit. If the unit to be marked is
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-- in the context item list of this unit spec, then the call returns
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-- True and Itm is left set to point to the relevant N_With_Clause node.
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procedure Set_Elab_Flag (Itm : Node_Id);
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-- Sets Elaborate_[All_]Desirable as appropriate on Itm
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-----------------------------
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-- Add_To_Context_And_Mark --
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-----------------------------
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procedure Add_To_Context_And_Mark (Itm : Node_Id) is
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CW : constant Node_Id :=
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Make_With_Clause (Sloc (Itm),
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Name => Name (Itm));
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begin
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Set_Library_Unit (CW, Library_Unit (Itm));
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Set_Implicit_With (CW, True);
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-- Set elaborate all desirable on copy and then append the copy to
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-- the list of body with's and we are done.
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Set_Elab_Flag (CW);
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Append_To (CI, CW);
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end Add_To_Context_And_Mark;
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-----------------
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-- In_Withs_Of --
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-----------------
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function In_Withs_Of (UEs : Entity_Id) return Boolean is
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UNs : constant Unit_Number_Type := Get_Source_Unit (UEs);
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CUs : constant Node_Id := Cunit (UNs);
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CIs : constant List_Id := Context_Items (CUs);
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begin
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Itm := First (CIs);
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while Present (Itm) loop
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if Nkind (Itm) = N_With_Clause then
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Ent :=
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Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
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if U = Ent then
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return True;
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end if;
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end if;
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Next (Itm);
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end loop;
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return False;
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end In_Withs_Of;
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-------------------
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-- Set_Elab_Flag --
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-------------------
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procedure Set_Elab_Flag (Itm : Node_Id) is
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begin
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if Nkind (N) in N_Subprogram_Instantiation then
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Set_Elaborate_Desirable (Itm);
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else
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Set_Elaborate_All_Desirable (Itm);
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end if;
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end Set_Elab_Flag;
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-- Start of processing for Activate_Elaborate_All_Desirable
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begin
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-- Do not set binder indication if expansion is disabled, as when
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-- compiling a generic unit.
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if not Expander_Active then
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return;
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end if;
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Itm := First (CI);
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while Present (Itm) loop
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if Nkind (Itm) = N_With_Clause then
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Ent := Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
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-- If we find it, then mark elaborate all desirable and return
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if U = Ent then
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Set_Elab_Flag (Itm);
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return;
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end if;
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end if;
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Next (Itm);
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end loop;
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-- If we fall through then the with clause is not present in the
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-- current unit. One legitimate possibility is that the with clause
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|
-- is present in the spec when we are a body.
|
|
|
|
if Is_Body_Name (Unm)
|
|
and then In_Withs_Of (Spec_Entity (UE))
|
|
then
|
|
Add_To_Context_And_Mark (Itm);
|
|
return;
|
|
end if;
|
|
|
|
-- Similarly, we may be in the spec or body of a child unit, where
|
|
-- the unit in question is with'ed by some ancestor of the child unit.
|
|
|
|
if Is_Child_Name (Unm) then
|
|
declare
|
|
Pkg : Entity_Id;
|
|
|
|
begin
|
|
Pkg := UE;
|
|
loop
|
|
Pkg := Scope (Pkg);
|
|
exit when Pkg = Standard_Standard;
|
|
|
|
if In_Withs_Of (Pkg) then
|
|
Add_To_Context_And_Mark (Itm);
|
|
return;
|
|
end if;
|
|
end loop;
|
|
end;
|
|
end if;
|
|
|
|
-- Here if we do not find with clause on spec or body. We just ignore
|
|
-- this case, it means that the elaboration involves some other unit
|
|
-- than the unit being compiled, and will be caught elsewhere.
|
|
|
|
null;
|
|
end Activate_Elaborate_All_Desirable;
|
|
|
|
------------------
|
|
-- Check_A_Call --
|
|
------------------
|
|
|
|
procedure Check_A_Call
|
|
(N : Node_Id;
|
|
E : Entity_Id;
|
|
Outer_Scope : Entity_Id;
|
|
Inter_Unit_Only : Boolean;
|
|
Generate_Warnings : Boolean := True;
|
|
In_Init_Proc : Boolean := False)
|
|
is
|
|
Access_Case : constant Boolean := Nkind (N) = N_Attribute_Reference;
|
|
-- Indicates if we have Access attribute case
|
|
|
|
function Call_To_Instance_From_Outside (Id : Entity_Id) return Boolean;
|
|
-- True if we're calling an instance of a generic subprogram, or a
|
|
-- subprogram in an instance of a generic package, and the call is
|
|
-- outside that instance.
|
|
|
|
procedure Elab_Warning
|
|
(Msg_D : String;
|
|
Msg_S : String;
|
|
Ent : Node_Or_Entity_Id);
|
|
-- Generate a call to Error_Msg_NE with parameters Msg_D or Msg_S (for
|
|
-- dynamic or static elaboration model), N and Ent. Msg_D is a real
|
|
-- warning (output if Msg_D is non-null and Elab_Warnings is set),
|
|
-- Msg_S is an info message (output if Elab_Info_Messages is set.
|
|
|
|
function Find_W_Scope return Entity_Id;
|
|
-- Find top-level scope for called entity (not following renamings
|
|
-- or derivations). This is where the Elaborate_All will go if it is
|
|
-- needed. We start with the called entity, except in the case of an
|
|
-- initialization procedure outside the current package, where the init
|
|
-- proc is in the root package, and we start from the entity of the name
|
|
-- in the call.
|
|
|
|
-----------------------------------
|
|
-- Call_To_Instance_From_Outside --
|
|
-----------------------------------
|
|
|
|
function Call_To_Instance_From_Outside (Id : Entity_Id) return Boolean is
|
|
Scop : Entity_Id := Id;
|
|
|
|
begin
|
|
loop
|
|
if Scop = Standard_Standard then
|
|
return False;
|
|
end if;
|
|
|
|
if Is_Generic_Instance (Scop) then
|
|
return not In_Open_Scopes (Scop);
|
|
end if;
|
|
|
|
Scop := Scope (Scop);
|
|
end loop;
|
|
end Call_To_Instance_From_Outside;
|
|
|
|
------------------
|
|
-- Elab_Warning --
|
|
------------------
|
|
|
|
procedure Elab_Warning
|
|
(Msg_D : String;
|
|
Msg_S : String;
|
|
Ent : Node_Or_Entity_Id)
|
|
is
|
|
begin
|
|
-- Dynamic elaboration checks, real warning
|
|
|
|
if Dynamic_Elaboration_Checks then
|
|
if not Access_Case then
|
|
if Msg_D /= "" and then Elab_Warnings then
|
|
Error_Msg_NE (Msg_D, N, Ent);
|
|
end if;
|
|
|
|
-- In the access case emit first warning message as well,
|
|
-- otherwise list of calls will appear as errors.
|
|
|
|
elsif Elab_Warnings then
|
|
Error_Msg_NE (Msg_S, N, Ent);
|
|
end if;
|
|
|
|
-- Static elaboration checks, info message
|
|
|
|
else
|
|
if Elab_Info_Messages then
|
|
Error_Msg_NE (Msg_S, N, Ent);
|
|
end if;
|
|
end if;
|
|
end Elab_Warning;
|
|
|
|
------------------
|
|
-- Find_W_Scope --
|
|
------------------
|
|
|
|
function Find_W_Scope return Entity_Id is
|
|
Refed_Ent : constant Entity_Id := Get_Referenced_Ent (N);
|
|
W_Scope : Entity_Id;
|
|
|
|
begin
|
|
if Is_Init_Proc (Refed_Ent)
|
|
and then not In_Same_Extended_Unit (N, Refed_Ent)
|
|
then
|
|
W_Scope := Scope (Refed_Ent);
|
|
else
|
|
W_Scope := E;
|
|
end if;
|
|
|
|
-- Now loop through scopes to get to the enclosing compilation unit
|
|
|
|
while not Is_Compilation_Unit (W_Scope) loop
|
|
W_Scope := Scope (W_Scope);
|
|
end loop;
|
|
|
|
return W_Scope;
|
|
end Find_W_Scope;
|
|
|
|
-- Locals
|
|
|
|
Variable_Case : constant Boolean :=
|
|
Nkind (N) in N_Has_Entity
|
|
and then Present (Entity (N))
|
|
and then Ekind (Entity (N)) = E_Variable;
|
|
-- Indicates if we have variable reference case
|
|
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
|
|
-- Indicates if we have instantiation case
|
|
|
|
Ent : Entity_Id;
|
|
Callee_Unit_Internal : Boolean;
|
|
Caller_Unit_Internal : Boolean;
|
|
Decl : Node_Id;
|
|
Inst_Callee : Source_Ptr;
|
|
Inst_Caller : Source_Ptr;
|
|
Unit_Callee : Unit_Number_Type;
|
|
Unit_Caller : Unit_Number_Type;
|
|
|
|
Body_Acts_As_Spec : Boolean;
|
|
-- Set to true if call is to body acting as spec (no separate spec)
|
|
|
|
Cunit_SC : Boolean := False;
|
|
-- Set to suppress dynamic elaboration checks where one of the
|
|
-- enclosing scopes has Elaboration_Checks_Suppressed set, or else
|
|
-- if a pragma Elaborate[_All] applies to that scope, in which case
|
|
-- warnings on the scope are also suppressed. For the internal case,
|
|
-- we ignore this flag.
|
|
|
|
E_Scope : Entity_Id;
|
|
-- Top-level scope of entity for called subprogram. This value includes
|
|
-- following renamings and derivations, so this scope can be in a
|
|
-- non-visible unit. This is the scope that is to be investigated to
|
|
-- see whether an elaboration check is required.
|
|
|
|
Is_DIC_Proc : Boolean := False;
|
|
-- Flag set when the call denotes the Default_Initial_Condition
|
|
-- procedure of a private type that wraps a nontrivial assertion
|
|
-- expression.
|
|
|
|
Issue_In_SPARK : Boolean;
|
|
-- Flag set when a source entity is called during elaboration in SPARK
|
|
|
|
W_Scope : constant Entity_Id := Find_W_Scope;
|
|
-- Top-level scope of directly called entity for subprogram. This
|
|
-- differs from E_Scope in the case where renamings or derivations
|
|
-- are involved, since it does not follow these links. W_Scope is
|
|
-- generally in a visible unit, and it is this scope that may require
|
|
-- an Elaborate_All. However, there are some cases (initialization
|
|
-- calls and calls involving object notation) where W_Scope might not
|
|
-- be in the context of the current unit, and there is an intermediate
|
|
-- package that is, in which case the Elaborate_All has to be placed
|
|
-- on this intermediate package. These special cases are handled in
|
|
-- Set_Elaboration_Constraint.
|
|
|
|
-- Start of processing for Check_A_Call
|
|
|
|
begin
|
|
-- If the call is known to be within a local Suppress Elaboration
|
|
-- pragma, nothing to check. This can happen in task bodies. But
|
|
-- we ignore this for a call to a generic formal.
|
|
|
|
if Nkind (N) in N_Subprogram_Call
|
|
and then No_Elaboration_Check (N)
|
|
and then not Is_Call_Of_Generic_Formal (N)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- If this is a rewrite of a Valid_Scalars attribute, then nothing to
|
|
-- check, we don't mind in this case if the call occurs before the body
|
|
-- since this is all generated code.
|
|
|
|
if Nkind (Original_Node (N)) = N_Attribute_Reference
|
|
and then Attribute_Name (Original_Node (N)) = Name_Valid_Scalars
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Intrinsics such as instances of Unchecked_Deallocation do not have
|
|
-- any body, so elaboration checking is not needed, and would be wrong.
|
|
|
|
if Is_Intrinsic_Subprogram (E) then
|
|
return;
|
|
end if;
|
|
|
|
-- Proceed with check
|
|
|
|
Ent := E;
|
|
|
|
-- For a variable reference, just set Body_Acts_As_Spec to False
|
|
|
|
if Variable_Case then
|
|
Body_Acts_As_Spec := False;
|
|
|
|
-- Additional checks for all other cases
|
|
|
|
else
|
|
-- Go to parent for derived subprogram, or to original subprogram in
|
|
-- the case of a renaming (Alias covers both these cases).
|
|
|
|
loop
|
|
if (Suppress_Elaboration_Warnings (Ent)
|
|
or else Elaboration_Checks_Suppressed (Ent))
|
|
and then (Inst_Case or else No (Alias (Ent)))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do for imported entities
|
|
|
|
if Is_Imported (Ent) then
|
|
return;
|
|
end if;
|
|
|
|
exit when Inst_Case or else No (Alias (Ent));
|
|
Ent := Alias (Ent);
|
|
end loop;
|
|
|
|
Decl := Unit_Declaration_Node (Ent);
|
|
|
|
if Nkind (Decl) = N_Subprogram_Body then
|
|
Body_Acts_As_Spec := True;
|
|
|
|
elsif Nkind_In (Decl, N_Subprogram_Declaration,
|
|
N_Subprogram_Body_Stub)
|
|
or else Inst_Case
|
|
then
|
|
Body_Acts_As_Spec := False;
|
|
|
|
-- If we have none of an instantiation, subprogram body or subprogram
|
|
-- declaration, or in the SPARK case, a variable reference, then
|
|
-- it is not a case that we want to check. (One case is a call to a
|
|
-- generic formal subprogram, where we do not want the check in the
|
|
-- template).
|
|
|
|
else
|
|
return;
|
|
end if;
|
|
end if;
|
|
|
|
E_Scope := Ent;
|
|
loop
|
|
if Elaboration_Checks_Suppressed (E_Scope)
|
|
or else Suppress_Elaboration_Warnings (E_Scope)
|
|
then
|
|
Cunit_SC := True;
|
|
end if;
|
|
|
|
-- Exit when we get to compilation unit, not counting subunits
|
|
|
|
exit when Is_Compilation_Unit (E_Scope)
|
|
and then (Is_Child_Unit (E_Scope)
|
|
or else Scope (E_Scope) = Standard_Standard);
|
|
|
|
pragma Assert (E_Scope /= Standard_Standard);
|
|
|
|
-- Move up a scope looking for compilation unit
|
|
|
|
E_Scope := Scope (E_Scope);
|
|
end loop;
|
|
|
|
-- No checks needed for pure or preelaborated compilation units
|
|
|
|
if Is_Pure (E_Scope) or else Is_Preelaborated (E_Scope) then
|
|
return;
|
|
end if;
|
|
|
|
-- If the generic entity is within a deeper instance than we are, then
|
|
-- either the instantiation to which we refer itself caused an ABE, in
|
|
-- which case that will be handled separately, or else we know that the
|
|
-- body we need appears as needed at the point of the instantiation.
|
|
-- However, this assumption is only valid if we are in static mode.
|
|
|
|
if not Dynamic_Elaboration_Checks
|
|
and then
|
|
Instantiation_Depth (Sloc (Ent)) > Instantiation_Depth (Sloc (N))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Do not give a warning for a package with no body
|
|
|
|
if Ekind (Ent) = E_Generic_Package and then not Has_Generic_Body (N) then
|
|
return;
|
|
end if;
|
|
|
|
-- Case of entity is in same unit as call or instantiation. In the
|
|
-- instantiation case, W_Scope may be different from E_Scope; we want
|
|
-- the unit in which the instantiation occurs, since we're analyzing
|
|
-- based on the expansion.
|
|
|
|
if W_Scope = C_Scope then
|
|
if not Inter_Unit_Only then
|
|
Check_Internal_Call (N, Ent, Outer_Scope, E);
|
|
end if;
|
|
|
|
return;
|
|
end if;
|
|
|
|
-- Case of entity is not in current unit (i.e. with'ed unit case)
|
|
|
|
-- We are only interested in such calls if the outer call was from
|
|
-- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
|
|
|
|
if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if some scope said that no checks were required
|
|
|
|
if Cunit_SC then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do for a generic instance, because a call to an instance
|
|
-- cannot fail the elaboration check, because the body of the instance
|
|
-- is always elaborated immediately after the spec.
|
|
|
|
if Call_To_Instance_From_Outside (Ent) then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if subprogram with no separate spec. However, a call
|
|
-- to Deep_Initialize may result in a call to a user-defined Initialize
|
|
-- procedure, which imposes a body dependency. This happens only if the
|
|
-- type is controlled and the Initialize procedure is not inherited.
|
|
|
|
if Body_Acts_As_Spec then
|
|
if Is_TSS (Ent, TSS_Deep_Initialize) then
|
|
declare
|
|
Typ : constant Entity_Id := Etype (First_Formal (Ent));
|
|
Init : Entity_Id;
|
|
|
|
begin
|
|
if not Is_Controlled (Typ) then
|
|
return;
|
|
else
|
|
Init := Find_Prim_Op (Typ, Name_Initialize);
|
|
|
|
if Comes_From_Source (Init) then
|
|
Ent := Init;
|
|
else
|
|
return;
|
|
end if;
|
|
end if;
|
|
end;
|
|
|
|
else
|
|
return;
|
|
end if;
|
|
end if;
|
|
|
|
-- Check cases of internal units
|
|
|
|
Callee_Unit_Internal :=
|
|
Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E_Scope)));
|
|
|
|
-- Do not give a warning if the with'ed unit is internal and this is
|
|
-- the generic instantiation case (this saves a lot of hassle dealing
|
|
-- with the Text_IO special child units)
|
|
|
|
if Callee_Unit_Internal and Inst_Case then
|
|
return;
|
|
end if;
|
|
|
|
if C_Scope = Standard_Standard then
|
|
Caller_Unit_Internal := False;
|
|
else
|
|
Caller_Unit_Internal :=
|
|
Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (C_Scope)));
|
|
end if;
|
|
|
|
-- Do not give a warning if the with'ed unit is internal and the
|
|
-- caller is not internal (since the binder always elaborates
|
|
-- internal units first).
|
|
|
|
if Callee_Unit_Internal and (not Caller_Unit_Internal) then
|
|
return;
|
|
end if;
|
|
|
|
-- For now, if debug flag -gnatdE is not set, do no checking for
|
|
-- one internal unit withing another. This fixes the problem with
|
|
-- the sgi build and storage errors. To be resolved later ???
|
|
|
|
if (Callee_Unit_Internal and Caller_Unit_Internal)
|
|
and not Debug_Flag_EE
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
if Is_TSS (E, TSS_Deep_Initialize) then
|
|
Ent := E;
|
|
end if;
|
|
|
|
-- If the call is in an instance, and the called entity is not
|
|
-- defined in the same instance, then the elaboration issue focuses
|
|
-- around the unit containing the template, it is this unit which
|
|
-- requires an Elaborate_All.
|
|
|
|
-- However, if we are doing dynamic elaboration, we need to chase the
|
|
-- call in the usual manner.
|
|
|
|
-- We also need to chase the call in the usual manner if it is a call
|
|
-- to a generic formal parameter, since that case was not handled as
|
|
-- part of the processing of the template.
|
|
|
|
Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
|
|
Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
|
|
|
|
if Inst_Caller = No_Location then
|
|
Unit_Caller := No_Unit;
|
|
else
|
|
Unit_Caller := Get_Source_Unit (N);
|
|
end if;
|
|
|
|
if Inst_Callee = No_Location then
|
|
Unit_Callee := No_Unit;
|
|
else
|
|
Unit_Callee := Get_Source_Unit (Ent);
|
|
end if;
|
|
|
|
if Unit_Caller /= No_Unit
|
|
and then Unit_Callee /= Unit_Caller
|
|
and then not Dynamic_Elaboration_Checks
|
|
and then not Is_Call_Of_Generic_Formal (N)
|
|
then
|
|
E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
|
|
|
|
-- If we don't get a spec entity, just ignore call. Not quite
|
|
-- clear why this check is necessary. ???
|
|
|
|
if No (E_Scope) then
|
|
return;
|
|
end if;
|
|
|
|
-- Otherwise step to enclosing compilation unit
|
|
|
|
while not Is_Compilation_Unit (E_Scope) loop
|
|
E_Scope := Scope (E_Scope);
|
|
end loop;
|
|
|
|
-- For the case where N is not an instance, and is not a call within
|
|
-- instance to other than a generic formal, we recompute E_Scope
|
|
-- for the error message, since we do NOT want to go to the unit
|
|
-- which has the ultimate declaration in the case of renaming and
|
|
-- derivation and we also want to go to the generic unit in the
|
|
-- case of an instance, and no further.
|
|
|
|
else
|
|
-- Loop to carefully follow renamings and derivations one step
|
|
-- outside the current unit, but not further.
|
|
|
|
if not (Inst_Case or Variable_Case)
|
|
and then Present (Alias (Ent))
|
|
then
|
|
E_Scope := Alias (Ent);
|
|
else
|
|
E_Scope := Ent;
|
|
end if;
|
|
|
|
loop
|
|
while not Is_Compilation_Unit (E_Scope) loop
|
|
E_Scope := Scope (E_Scope);
|
|
end loop;
|
|
|
|
-- If E_Scope is the same as C_Scope, it means that there
|
|
-- definitely was a local renaming or derivation, and we
|
|
-- are not yet out of the current unit.
|
|
|
|
exit when E_Scope /= C_Scope;
|
|
Ent := Alias (Ent);
|
|
E_Scope := Ent;
|
|
|
|
-- If no alias, there could be a previous error, but not if we've
|
|
-- already reached the outermost level (Standard).
|
|
|
|
if No (Ent) then
|
|
return;
|
|
end if;
|
|
end loop;
|
|
end if;
|
|
|
|
if Within_Elaborate_All (Current_Sem_Unit, E_Scope) then
|
|
return;
|
|
end if;
|
|
|
|
Is_DIC_Proc := Is_Nontrivial_Default_Init_Cond_Procedure (Ent);
|
|
|
|
-- Elaboration issues in SPARK are reported only for source constructs
|
|
-- and for nontrivial Default_Initial_Condition procedures. The latter
|
|
-- must be checked because the default initialization of an object of a
|
|
-- private type triggers the evaluation of the Default_Initial_Condition
|
|
-- expression, which in turn may have side effects.
|
|
|
|
Issue_In_SPARK :=
|
|
SPARK_Mode = On
|
|
and then Dynamic_Elaboration_Checks
|
|
and then (Comes_From_Source (Ent) or Is_DIC_Proc);
|
|
|
|
-- Now check if an Elaborate_All (or dynamic check) is needed
|
|
|
|
if not Suppress_Elaboration_Warnings (Ent)
|
|
and then not Elaboration_Checks_Suppressed (Ent)
|
|
and then not Suppress_Elaboration_Warnings (E_Scope)
|
|
and then not Elaboration_Checks_Suppressed (E_Scope)
|
|
and then ((Elab_Warnings or Elab_Info_Messages)
|
|
or else SPARK_Mode = On)
|
|
and then Generate_Warnings
|
|
then
|
|
-- Instantiation case
|
|
|
|
if Inst_Case then
|
|
if Issue_In_SPARK then
|
|
Error_Msg_NE
|
|
("instantiation of & during elaboration in SPARK", N, Ent);
|
|
else
|
|
Elab_Warning
|
|
("instantiation of & may raise Program_Error?l?",
|
|
"info: instantiation of & during elaboration?$?", Ent);
|
|
end if;
|
|
|
|
-- Indirect call case, info message only in static elaboration
|
|
-- case, because the attribute reference itself cannot raise an
|
|
-- exception. Note that SPARK does not permit indirect calls.
|
|
|
|
elsif Access_Case then
|
|
Elab_Warning ("", "info: access to & during elaboration?$?", Ent);
|
|
|
|
-- Variable reference in SPARK mode
|
|
|
|
elsif Variable_Case and Issue_In_SPARK then
|
|
Error_Msg_NE
|
|
("reference to & during elaboration in SPARK", N, Ent);
|
|
|
|
-- Subprogram call case
|
|
|
|
else
|
|
if Nkind (Name (N)) in N_Has_Entity
|
|
and then Is_Init_Proc (Entity (Name (N)))
|
|
and then Comes_From_Source (Ent)
|
|
then
|
|
Elab_Warning
|
|
("implicit call to & may raise Program_Error?l?",
|
|
"info: implicit call to & during elaboration?$?",
|
|
Ent);
|
|
|
|
elsif Issue_In_SPARK then
|
|
|
|
-- Emit a specialized error message when the elaboration of an
|
|
-- object of a private type evaluates the expression of pragma
|
|
-- Default_Initial_Condition. This prevents the internal name
|
|
-- of the procedure from appearing in the error message.
|
|
|
|
if Is_DIC_Proc then
|
|
Error_Msg_N
|
|
("call to Default_Initial_Condition during elaboration in "
|
|
& "SPARK", N);
|
|
else
|
|
Error_Msg_NE
|
|
("call to & during elaboration in SPARK", N, Ent);
|
|
end if;
|
|
|
|
else
|
|
Elab_Warning
|
|
("call to & may raise Program_Error?l?",
|
|
"info: call to & during elaboration?$?",
|
|
Ent);
|
|
end if;
|
|
end if;
|
|
|
|
Error_Msg_Qual_Level := Nat'Last;
|
|
|
|
-- Case of Elaborate_All not present and required, for SPARK this
|
|
-- is an error, so give an error message.
|
|
|
|
if Issue_In_SPARK then
|
|
Error_Msg_NE -- CODEFIX
|
|
("\Elaborate_All pragma required for&", N, W_Scope);
|
|
|
|
-- Otherwise we generate an implicit pragma. For a subprogram
|
|
-- instantiation, Elaborate is good enough, since no transitive
|
|
-- call is possible at elaboration time in this case.
|
|
|
|
elsif Nkind (N) in N_Subprogram_Instantiation then
|
|
Elab_Warning
|
|
("\missing pragma Elaborate for&?l?",
|
|
"\implicit pragma Elaborate for& generated?$?",
|
|
W_Scope);
|
|
|
|
-- For all other cases, we need an implicit Elaborate_All
|
|
|
|
else
|
|
Elab_Warning
|
|
("\missing pragma Elaborate_All for&?l?",
|
|
"\implicit pragma Elaborate_All for & generated?$?",
|
|
W_Scope);
|
|
end if;
|
|
|
|
Error_Msg_Qual_Level := 0;
|
|
|
|
-- Take into account the flags related to elaboration warning
|
|
-- messages when enumerating the various calls involved. This
|
|
-- ensures the proper pairing of the main warning and the
|
|
-- clarification messages generated by Output_Calls.
|
|
|
|
Output_Calls (N, Check_Elab_Flag => True);
|
|
|
|
-- Set flag to prevent further warnings for same unit unless in
|
|
-- All_Errors_Mode.
|
|
|
|
if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
|
|
Set_Suppress_Elaboration_Warnings (W_Scope, True);
|
|
end if;
|
|
end if;
|
|
|
|
-- Check for runtime elaboration check required
|
|
|
|
if Dynamic_Elaboration_Checks then
|
|
if not Elaboration_Checks_Suppressed (Ent)
|
|
and then not Elaboration_Checks_Suppressed (W_Scope)
|
|
and then not Elaboration_Checks_Suppressed (E_Scope)
|
|
and then not Cunit_SC
|
|
then
|
|
-- Runtime elaboration check required. Generate check of the
|
|
-- elaboration Boolean for the unit containing the entity.
|
|
|
|
-- Note that for this case, we do check the real unit (the one
|
|
-- from following renamings, since that is the issue).
|
|
|
|
-- Could this possibly miss a useless but required PE???
|
|
|
|
Insert_Elab_Check (N,
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Elaborated,
|
|
Prefix =>
|
|
New_Occurrence_Of (Spec_Entity (E_Scope), Loc)));
|
|
|
|
-- Prevent duplicate elaboration checks on the same call,
|
|
-- which can happen if the body enclosing the call appears
|
|
-- itself in a call whose elaboration check is delayed.
|
|
|
|
if Nkind (N) in N_Subprogram_Call then
|
|
Set_No_Elaboration_Check (N);
|
|
end if;
|
|
end if;
|
|
|
|
-- Case of static elaboration model
|
|
|
|
else
|
|
-- Do not do anything if elaboration checks suppressed. Note that
|
|
-- we check Ent here, not E, since we want the real entity for the
|
|
-- body to see if checks are suppressed for it, not the dummy
|
|
-- entry for renamings or derivations.
|
|
|
|
if Elaboration_Checks_Suppressed (Ent)
|
|
or else Elaboration_Checks_Suppressed (E_Scope)
|
|
or else Elaboration_Checks_Suppressed (W_Scope)
|
|
then
|
|
null;
|
|
|
|
-- Do not generate an Elaborate_All for finalization routines
|
|
-- which perform partial clean up as part of initialization.
|
|
|
|
elsif In_Init_Proc and then Is_Finalization_Procedure (Ent) then
|
|
null;
|
|
|
|
-- Here we need to generate an implicit elaborate all
|
|
|
|
else
|
|
-- Generate Elaborate_All warning unless suppressed
|
|
|
|
if (Elab_Info_Messages and Generate_Warnings and not Inst_Case)
|
|
and then not Suppress_Elaboration_Warnings (Ent)
|
|
and then not Suppress_Elaboration_Warnings (E_Scope)
|
|
and then not Suppress_Elaboration_Warnings (W_Scope)
|
|
then
|
|
Error_Msg_Node_2 := W_Scope;
|
|
Error_Msg_NE
|
|
("info: call to& in elaboration code " &
|
|
"requires pragma Elaborate_All on&?$?", N, E);
|
|
end if;
|
|
|
|
-- Set indication for binder to generate Elaborate_All
|
|
|
|
Set_Elaboration_Constraint (N, E, W_Scope);
|
|
end if;
|
|
end if;
|
|
end Check_A_Call;
|
|
|
|
-----------------------------
|
|
-- Check_Bad_Instantiation --
|
|
-----------------------------
|
|
|
|
procedure Check_Bad_Instantiation (N : Node_Id) is
|
|
Ent : Entity_Id;
|
|
|
|
begin
|
|
-- Nothing to do if we do not have an instantiation (happens in some
|
|
-- error cases, and also in the formal package declaration case)
|
|
|
|
if Nkind (N) not in N_Generic_Instantiation then
|
|
return;
|
|
|
|
-- Nothing to do if serious errors detected (avoid cascaded errors)
|
|
|
|
elsif Serious_Errors_Detected /= 0 then
|
|
return;
|
|
|
|
-- Nothing to do if not in full analysis mode
|
|
|
|
elsif not Full_Analysis then
|
|
return;
|
|
|
|
-- Nothing to do if inside a generic template
|
|
|
|
elsif Inside_A_Generic then
|
|
return;
|
|
|
|
-- Nothing to do if a library level instantiation
|
|
|
|
elsif Nkind (Parent (N)) = N_Compilation_Unit then
|
|
return;
|
|
|
|
-- Nothing to do if we are compiling a proper body for semantic
|
|
-- purposes only. The generic body may be in another proper body.
|
|
|
|
elsif
|
|
Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
Ent := Get_Generic_Entity (N);
|
|
|
|
-- The case we are interested in is when the generic spec is in the
|
|
-- current declarative part
|
|
|
|
if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
|
|
or else not In_Same_Extended_Unit (N, Ent)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- If the generic entity is within a deeper instance than we are, then
|
|
-- either the instantiation to which we refer itself caused an ABE, in
|
|
-- which case that will be handled separately. Otherwise, we know that
|
|
-- the body we need appears as needed at the point of the instantiation.
|
|
-- If they are both at the same level but not within the same instance
|
|
-- then the body of the generic will be in the earlier instance.
|
|
|
|
declare
|
|
D1 : constant Nat := Instantiation_Depth (Sloc (Ent));
|
|
D2 : constant Nat := Instantiation_Depth (Sloc (N));
|
|
|
|
begin
|
|
if D1 > D2 then
|
|
return;
|
|
|
|
elsif D1 = D2
|
|
and then Is_Generic_Instance (Scope (Ent))
|
|
and then not In_Open_Scopes (Scope (Ent))
|
|
then
|
|
return;
|
|
end if;
|
|
end;
|
|
|
|
-- Now we can proceed, if the entity being called has a completion,
|
|
-- then we are definitely OK, since we have already seen the body.
|
|
|
|
if Has_Completion (Ent) then
|
|
return;
|
|
end if;
|
|
|
|
-- If there is no body, then nothing to do
|
|
|
|
if not Has_Generic_Body (N) then
|
|
return;
|
|
end if;
|
|
|
|
-- Here we definitely have a bad instantiation
|
|
|
|
Error_Msg_Warn := SPARK_Mode /= On;
|
|
Error_Msg_NE ("cannot instantiate& before body seen<<", N, Ent);
|
|
|
|
if Present (Instance_Spec (N)) then
|
|
Supply_Bodies (Instance_Spec (N));
|
|
end if;
|
|
|
|
Error_Msg_N ("\Program_Error [<<", N);
|
|
Insert_Elab_Check (N);
|
|
Set_ABE_Is_Certain (N);
|
|
end Check_Bad_Instantiation;
|
|
|
|
---------------------
|
|
-- Check_Elab_Call --
|
|
---------------------
|
|
|
|
procedure Check_Elab_Call
|
|
(N : Node_Id;
|
|
Outer_Scope : Entity_Id := Empty;
|
|
In_Init_Proc : Boolean := False)
|
|
is
|
|
Ent : Entity_Id;
|
|
P : Node_Id;
|
|
|
|
begin
|
|
-- If the reference is not in the main unit, there is nothing to check.
|
|
-- Elaboration call from units in the context of the main unit will lead
|
|
-- to semantic dependencies when those units are compiled.
|
|
|
|
if not In_Extended_Main_Code_Unit (N) then
|
|
return;
|
|
end if;
|
|
|
|
-- For an entry call, check relevant restriction
|
|
|
|
if Nkind (N) = N_Entry_Call_Statement
|
|
and then not In_Subprogram_Or_Concurrent_Unit
|
|
then
|
|
Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
|
|
|
|
-- Nothing to do if this is not an expected type of reference (happens
|
|
-- in some error conditions, and in some cases where rewriting occurs).
|
|
|
|
elsif Nkind (N) not in N_Subprogram_Call
|
|
and then Nkind (N) /= N_Attribute_Reference
|
|
and then (SPARK_Mode /= On
|
|
or else Nkind (N) not in N_Has_Entity
|
|
or else No (Entity (N))
|
|
or else Ekind (Entity (N)) /= E_Variable)
|
|
then
|
|
return;
|
|
|
|
-- Nothing to do if this is a call already rewritten for elab checking.
|
|
-- Such calls appear as the targets of If_Expressions.
|
|
|
|
-- This check MUST be wrong, it catches far too much
|
|
|
|
elsif Nkind (Parent (N)) = N_If_Expression then
|
|
return;
|
|
|
|
-- Nothing to do if inside a generic template
|
|
|
|
elsif Inside_A_Generic
|
|
and then No (Enclosing_Generic_Body (N))
|
|
then
|
|
return;
|
|
|
|
-- Nothing to do if call is being pre-analyzed, as when within a
|
|
-- pre/postcondition, a predicate, or an invariant.
|
|
|
|
elsif In_Spec_Expression then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if this is a call to a postcondition, which is always
|
|
-- within a subprogram body, even though the current scope may be the
|
|
-- enclosing scope of the subprogram.
|
|
|
|
if Nkind (N) = N_Procedure_Call_Statement
|
|
and then Is_Entity_Name (Name (N))
|
|
and then Chars (Entity (Name (N))) = Name_uPostconditions
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Here we have a reference at elaboration time which must be checked
|
|
|
|
if Debug_Flag_LL then
|
|
Write_Str (" Check_Elab_Ref: ");
|
|
|
|
if Nkind (N) = N_Attribute_Reference then
|
|
if not Is_Entity_Name (Prefix (N)) then
|
|
Write_Str ("<<not entity name>>");
|
|
else
|
|
Write_Name (Chars (Entity (Prefix (N))));
|
|
end if;
|
|
|
|
Write_Str ("'Access");
|
|
|
|
elsif No (Name (N)) or else not Is_Entity_Name (Name (N)) then
|
|
Write_Str ("<<not entity name>> ");
|
|
|
|
else
|
|
Write_Name (Chars (Entity (Name (N))));
|
|
end if;
|
|
|
|
Write_Str (" reference at ");
|
|
Write_Location (Sloc (N));
|
|
Write_Eol;
|
|
end if;
|
|
|
|
-- Climb up the tree to make sure we are not inside default expression
|
|
-- of a parameter specification or a record component, since in both
|
|
-- these cases, we will be doing the actual reference later, not now,
|
|
-- and it is at the time of the actual reference (statically speaking)
|
|
-- that we must do our static check, not at the time of its initial
|
|
-- analysis).
|
|
|
|
-- However, we have to check references within component definitions
|
|
-- (e.g. a function call that determines an array component bound),
|
|
-- so we terminate the loop in that case.
|
|
|
|
P := Parent (N);
|
|
while Present (P) loop
|
|
if Nkind_In (P, N_Parameter_Specification,
|
|
N_Component_Declaration)
|
|
then
|
|
return;
|
|
|
|
-- The reference occurs within the constraint of a component,
|
|
-- so it must be checked.
|
|
|
|
elsif Nkind (P) = N_Component_Definition then
|
|
exit;
|
|
|
|
else
|
|
P := Parent (P);
|
|
end if;
|
|
end loop;
|
|
|
|
-- Stuff that happens only at the outer level
|
|
|
|
if No (Outer_Scope) then
|
|
Elab_Visited.Set_Last (0);
|
|
|
|
-- Nothing to do if current scope is Standard (this is a bit odd, but
|
|
-- it happens in the case of generic instantiations).
|
|
|
|
C_Scope := Current_Scope;
|
|
|
|
if C_Scope = Standard_Standard then
|
|
return;
|
|
end if;
|
|
|
|
-- First case, we are in elaboration code
|
|
|
|
From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
|
|
|
|
if From_Elab_Code then
|
|
|
|
-- Complain if ref that comes from source in preelaborated unit
|
|
-- and we are not inside a subprogram (i.e. we are in elab code).
|
|
|
|
if Comes_From_Source (N)
|
|
and then In_Preelaborated_Unit
|
|
and then not In_Inlined_Body
|
|
and then Nkind (N) /= N_Attribute_Reference
|
|
then
|
|
-- This is a warning in GNAT mode allowing such calls to be
|
|
-- used in the predefined library with appropriate care.
|
|
|
|
Error_Msg_Warn := GNAT_Mode;
|
|
Error_Msg_N
|
|
("<<non-static call not allowed in preelaborated unit", N);
|
|
return;
|
|
end if;
|
|
|
|
-- Second case, we are inside a subprogram or concurrent unit, which
|
|
-- means we are not in elaboration code.
|
|
|
|
else
|
|
-- In this case, the issue is whether we are inside the
|
|
-- declarative part of the unit in which we live, or inside its
|
|
-- statements. In the latter case, there is no issue of ABE calls
|
|
-- at this level (a call from outside to the unit in which we live
|
|
-- might cause an ABE, but that will be detected when we analyze
|
|
-- that outer level call, as it recurses into the called unit).
|
|
|
|
-- Climb up the tree, doing this test, and also testing for being
|
|
-- inside a default expression, which, as discussed above, is not
|
|
-- checked at this stage.
|
|
|
|
declare
|
|
P : Node_Id;
|
|
L : List_Id;
|
|
|
|
begin
|
|
P := N;
|
|
loop
|
|
-- If we find a parentless subtree, it seems safe to assume
|
|
-- that we are not in a declarative part and that no
|
|
-- checking is required.
|
|
|
|
if No (P) then
|
|
return;
|
|
end if;
|
|
|
|
if Is_List_Member (P) then
|
|
L := List_Containing (P);
|
|
P := Parent (L);
|
|
else
|
|
L := No_List;
|
|
P := Parent (P);
|
|
end if;
|
|
|
|
exit when Nkind (P) = N_Subunit;
|
|
|
|
-- Filter out case of default expressions, where we do not
|
|
-- do the check at this stage.
|
|
|
|
if Nkind_In (P, N_Parameter_Specification,
|
|
N_Component_Declaration)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- A protected body has no elaboration code and contains
|
|
-- only other bodies.
|
|
|
|
if Nkind (P) = N_Protected_Body then
|
|
return;
|
|
|
|
elsif Nkind_In (P, N_Subprogram_Body,
|
|
N_Task_Body,
|
|
N_Block_Statement,
|
|
N_Entry_Body)
|
|
then
|
|
if L = Declarations (P) then
|
|
exit;
|
|
|
|
-- We are not in elaboration code, but we are doing
|
|
-- dynamic elaboration checks, in this case, we still
|
|
-- need to do the reference, since the subprogram we are
|
|
-- in could be called from another unit, also in dynamic
|
|
-- elaboration check mode, at elaboration time.
|
|
|
|
elsif Dynamic_Elaboration_Checks then
|
|
|
|
-- We provide a debug flag to disable this check. That
|
|
-- way we have an easy work around for regressions
|
|
-- that are caused by this new check. This debug flag
|
|
-- can be removed later.
|
|
|
|
if Debug_Flag_DD then
|
|
return;
|
|
end if;
|
|
|
|
-- Do the check in this case
|
|
|
|
exit;
|
|
|
|
elsif Nkind (P) = N_Task_Body then
|
|
|
|
-- The check is deferred until Check_Task_Activation
|
|
-- but we need to capture local suppress pragmas
|
|
-- that may inhibit checks on this call.
|
|
|
|
Ent := Get_Referenced_Ent (N);
|
|
|
|
if No (Ent) then
|
|
return;
|
|
|
|
elsif Elaboration_Checks_Suppressed (Current_Scope)
|
|
or else Elaboration_Checks_Suppressed (Ent)
|
|
or else Elaboration_Checks_Suppressed (Scope (Ent))
|
|
then
|
|
if Nkind (N) in N_Subprogram_Call then
|
|
Set_No_Elaboration_Check (N);
|
|
end if;
|
|
end if;
|
|
|
|
return;
|
|
|
|
-- Static model, call is not in elaboration code, we
|
|
-- never need to worry, because in the static model the
|
|
-- top-level caller always takes care of things.
|
|
|
|
else
|
|
return;
|
|
end if;
|
|
end if;
|
|
end loop;
|
|
end;
|
|
end if;
|
|
end if;
|
|
|
|
Ent := Get_Referenced_Ent (N);
|
|
|
|
if No (Ent) then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if this is a recursive call (i.e. a call to
|
|
-- an entity that is already in the Elab_Call stack)
|
|
|
|
for J in 1 .. Elab_Visited.Last loop
|
|
if Ent = Elab_Visited.Table (J) then
|
|
return;
|
|
end if;
|
|
end loop;
|
|
|
|
-- See if we need to analyze this reference. We analyze it if either of
|
|
-- the following conditions is met:
|
|
|
|
-- It is an inner level call (since in this case it was triggered
|
|
-- by an outer level call from elaboration code), but only if the
|
|
-- call is within the scope of the original outer level call.
|
|
|
|
-- It is an outer level reference from elaboration code, or a call to
|
|
-- an entity is in the same elaboration scope.
|
|
|
|
-- And in these cases, we will check both inter-unit calls and
|
|
-- intra-unit (within a single unit) calls.
|
|
|
|
C_Scope := Current_Scope;
|
|
|
|
-- If not outer level reference, then we follow it if it is within the
|
|
-- original scope of the outer reference.
|
|
|
|
if Present (Outer_Scope)
|
|
and then Within (Scope (Ent), Outer_Scope)
|
|
then
|
|
Set_C_Scope;
|
|
Check_A_Call
|
|
(N => N,
|
|
E => Ent,
|
|
Outer_Scope => Outer_Scope,
|
|
Inter_Unit_Only => False,
|
|
In_Init_Proc => In_Init_Proc);
|
|
|
|
-- Nothing to do if elaboration checks suppressed for this scope.
|
|
-- However, an interesting exception, the fact that elaboration checks
|
|
-- are suppressed within an instance (because we can trace the body when
|
|
-- we process the template) does not extend to calls to generic formal
|
|
-- subprograms.
|
|
|
|
elsif Elaboration_Checks_Suppressed (Current_Scope)
|
|
and then not Is_Call_Of_Generic_Formal (N)
|
|
then
|
|
null;
|
|
|
|
elsif From_Elab_Code then
|
|
Set_C_Scope;
|
|
Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
|
|
|
|
elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
|
|
Set_C_Scope;
|
|
Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
|
|
|
|
-- If none of those cases holds, but Dynamic_Elaboration_Checks mode
|
|
-- is set, then we will do the check, but only in the inter-unit case
|
|
-- (this is to accommodate unguarded elaboration calls from other units
|
|
-- in which this same mode is set). We don't want warnings in this case,
|
|
-- it would generate warnings having nothing to do with elaboration.
|
|
|
|
elsif Dynamic_Elaboration_Checks then
|
|
Set_C_Scope;
|
|
Check_A_Call
|
|
(N,
|
|
Ent,
|
|
Standard_Standard,
|
|
Inter_Unit_Only => True,
|
|
Generate_Warnings => False);
|
|
|
|
-- Otherwise nothing to do
|
|
|
|
else
|
|
return;
|
|
end if;
|
|
|
|
-- A call to an Init_Proc in elaboration code may bring additional
|
|
-- dependencies, if some of the record components thereof have
|
|
-- initializations that are function calls that come from source. We
|
|
-- treat the current node as a call to each of these functions, to check
|
|
-- their elaboration impact.
|
|
|
|
if Is_Init_Proc (Ent) and then From_Elab_Code then
|
|
Process_Init_Proc : declare
|
|
Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
|
|
|
|
function Check_Init_Call (Nod : Node_Id) return Traverse_Result;
|
|
-- Find subprogram calls within body of Init_Proc for Traverse
|
|
-- instantiation below.
|
|
|
|
procedure Traverse_Body is new Traverse_Proc (Check_Init_Call);
|
|
-- Traversal procedure to find all calls with body of Init_Proc
|
|
|
|
---------------------
|
|
-- Check_Init_Call --
|
|
---------------------
|
|
|
|
function Check_Init_Call (Nod : Node_Id) return Traverse_Result is
|
|
Func : Entity_Id;
|
|
|
|
begin
|
|
if Nkind (Nod) in N_Subprogram_Call
|
|
and then Is_Entity_Name (Name (Nod))
|
|
then
|
|
Func := Entity (Name (Nod));
|
|
|
|
if Comes_From_Source (Func) then
|
|
Check_A_Call
|
|
(N, Func, Standard_Standard, Inter_Unit_Only => True);
|
|
end if;
|
|
|
|
return OK;
|
|
|
|
else
|
|
return OK;
|
|
end if;
|
|
end Check_Init_Call;
|
|
|
|
-- Start of processing for Process_Init_Proc
|
|
|
|
begin
|
|
if Nkind (Unit_Decl) = N_Subprogram_Body then
|
|
Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
|
|
end if;
|
|
end Process_Init_Proc;
|
|
end if;
|
|
end Check_Elab_Call;
|
|
|
|
-----------------------
|
|
-- Check_Elab_Assign --
|
|
-----------------------
|
|
|
|
procedure Check_Elab_Assign (N : Node_Id) is
|
|
Ent : Entity_Id;
|
|
Scop : Entity_Id;
|
|
|
|
Pkg_Spec : Entity_Id;
|
|
Pkg_Body : Entity_Id;
|
|
|
|
begin
|
|
-- For record or array component, check prefix. If it is an access type,
|
|
-- then there is nothing to do (we do not know what is being assigned),
|
|
-- but otherwise this is an assignment to the prefix.
|
|
|
|
if Nkind_In (N, N_Indexed_Component,
|
|
N_Selected_Component,
|
|
N_Slice)
|
|
then
|
|
if not Is_Access_Type (Etype (Prefix (N))) then
|
|
Check_Elab_Assign (Prefix (N));
|
|
end if;
|
|
|
|
return;
|
|
end if;
|
|
|
|
-- For type conversion, check expression
|
|
|
|
if Nkind (N) = N_Type_Conversion then
|
|
Check_Elab_Assign (Expression (N));
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if this is not an entity reference otherwise get entity
|
|
|
|
if Is_Entity_Name (N) then
|
|
Ent := Entity (N);
|
|
else
|
|
return;
|
|
end if;
|
|
|
|
-- What we are looking for is a reference in the body of a package that
|
|
-- modifies a variable declared in the visible part of the package spec.
|
|
|
|
if Present (Ent)
|
|
and then Comes_From_Source (N)
|
|
and then not Suppress_Elaboration_Warnings (Ent)
|
|
and then Ekind (Ent) = E_Variable
|
|
and then not In_Private_Part (Ent)
|
|
and then Is_Library_Level_Entity (Ent)
|
|
then
|
|
Scop := Current_Scope;
|
|
loop
|
|
if No (Scop) or else Scop = Standard_Standard then
|
|
return;
|
|
elsif Ekind (Scop) = E_Package
|
|
and then Is_Compilation_Unit (Scop)
|
|
then
|
|
exit;
|
|
else
|
|
Scop := Scope (Scop);
|
|
end if;
|
|
end loop;
|
|
|
|
-- Here Scop points to the containing library package
|
|
|
|
Pkg_Spec := Scop;
|
|
Pkg_Body := Body_Entity (Pkg_Spec);
|
|
|
|
-- All OK if the package has an Elaborate_Body pragma
|
|
|
|
if Has_Pragma_Elaborate_Body (Scop) then
|
|
return;
|
|
end if;
|
|
|
|
-- OK if entity being modified is not in containing package spec
|
|
|
|
if not In_Same_Source_Unit (Scop, Ent) then
|
|
return;
|
|
end if;
|
|
|
|
-- All OK if entity appears in generic package or generic instance.
|
|
-- We just get too messed up trying to give proper warnings in the
|
|
-- presence of generics. Better no message than a junk one.
|
|
|
|
Scop := Scope (Ent);
|
|
while Present (Scop) and then Scop /= Pkg_Spec loop
|
|
if Ekind (Scop) = E_Generic_Package then
|
|
return;
|
|
elsif Ekind (Scop) = E_Package
|
|
and then Is_Generic_Instance (Scop)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
Scop := Scope (Scop);
|
|
end loop;
|
|
|
|
-- All OK if in task, don't issue warnings there
|
|
|
|
if In_Task_Activation then
|
|
return;
|
|
end if;
|
|
|
|
-- OK if no package body
|
|
|
|
if No (Pkg_Body) then
|
|
return;
|
|
end if;
|
|
|
|
-- OK if reference is not in package body
|
|
|
|
if not In_Same_Source_Unit (Pkg_Body, N) then
|
|
return;
|
|
end if;
|
|
|
|
-- OK if package body has no handled statement sequence
|
|
|
|
declare
|
|
HSS : constant Node_Id :=
|
|
Handled_Statement_Sequence (Declaration_Node (Pkg_Body));
|
|
begin
|
|
if No (HSS) or else not Comes_From_Source (HSS) then
|
|
return;
|
|
end if;
|
|
end;
|
|
|
|
-- We definitely have a case of a modification of an entity in
|
|
-- the package spec from the elaboration code of the package body.
|
|
-- We may not give the warning (because there are some additional
|
|
-- checks to avoid too many false positives), but it would be a good
|
|
-- idea for the binder to try to keep the body elaboration close to
|
|
-- the spec elaboration.
|
|
|
|
Set_Elaborate_Body_Desirable (Pkg_Spec);
|
|
|
|
-- All OK in gnat mode (we know what we are doing)
|
|
|
|
if GNAT_Mode then
|
|
return;
|
|
end if;
|
|
|
|
-- All OK if all warnings suppressed
|
|
|
|
if Warning_Mode = Suppress then
|
|
return;
|
|
end if;
|
|
|
|
-- All OK if elaboration checks suppressed for entity
|
|
|
|
if Checks_May_Be_Suppressed (Ent)
|
|
and then Is_Check_Suppressed (Ent, Elaboration_Check)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- OK if the entity is initialized. Note that the No_Initialization
|
|
-- flag usually means that the initialization has been rewritten into
|
|
-- assignments, but that still counts for us.
|
|
|
|
declare
|
|
Decl : constant Node_Id := Declaration_Node (Ent);
|
|
begin
|
|
if Nkind (Decl) = N_Object_Declaration
|
|
and then (Present (Expression (Decl))
|
|
or else No_Initialization (Decl))
|
|
then
|
|
return;
|
|
end if;
|
|
end;
|
|
|
|
-- Here is where we give the warning
|
|
|
|
-- All OK if warnings suppressed on the entity
|
|
|
|
if not Has_Warnings_Off (Ent) then
|
|
Error_Msg_Sloc := Sloc (Ent);
|
|
|
|
Error_Msg_NE
|
|
("??& can be accessed by clients before this initialization",
|
|
N, Ent);
|
|
Error_Msg_NE
|
|
("\??add Elaborate_Body to spec to ensure & is initialized",
|
|
N, Ent);
|
|
end if;
|
|
|
|
if not All_Errors_Mode then
|
|
Set_Suppress_Elaboration_Warnings (Ent);
|
|
end if;
|
|
end if;
|
|
end Check_Elab_Assign;
|
|
|
|
----------------------
|
|
-- Check_Elab_Calls --
|
|
----------------------
|
|
|
|
procedure Check_Elab_Calls is
|
|
begin
|
|
-- If expansion is disabled, do not generate any checks. Also skip
|
|
-- checks if any subunits are missing because in either case we lack the
|
|
-- full information that we need, and no object file will be created in
|
|
-- any case.
|
|
|
|
if not Expander_Active
|
|
or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
|
|
or else Subunits_Missing
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Skip delayed calls if we had any errors
|
|
|
|
if Serious_Errors_Detected = 0 then
|
|
Delaying_Elab_Checks := False;
|
|
Expander_Mode_Save_And_Set (True);
|
|
|
|
for J in Delay_Check.First .. Delay_Check.Last loop
|
|
Push_Scope (Delay_Check.Table (J).Curscop);
|
|
From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
|
|
|
|
Check_Internal_Call_Continue (
|
|
N => Delay_Check.Table (J).N,
|
|
E => Delay_Check.Table (J).E,
|
|
Outer_Scope => Delay_Check.Table (J).Outer_Scope,
|
|
Orig_Ent => Delay_Check.Table (J).Orig_Ent);
|
|
|
|
Pop_Scope;
|
|
end loop;
|
|
|
|
-- Set Delaying_Elab_Checks back on for next main compilation
|
|
|
|
Expander_Mode_Restore;
|
|
Delaying_Elab_Checks := True;
|
|
end if;
|
|
end Check_Elab_Calls;
|
|
|
|
------------------------------
|
|
-- Check_Elab_Instantiation --
|
|
------------------------------
|
|
|
|
procedure Check_Elab_Instantiation
|
|
(N : Node_Id;
|
|
Outer_Scope : Entity_Id := Empty)
|
|
is
|
|
Ent : Entity_Id;
|
|
|
|
begin
|
|
-- Check for and deal with bad instantiation case. There is some
|
|
-- duplicated code here, but we will worry about this later ???
|
|
|
|
Check_Bad_Instantiation (N);
|
|
|
|
if ABE_Is_Certain (N) then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if we do not have an instantiation (happens in some
|
|
-- error cases, and also in the formal package declaration case)
|
|
|
|
if Nkind (N) not in N_Generic_Instantiation then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if inside a generic template
|
|
|
|
if Inside_A_Generic then
|
|
return;
|
|
end if;
|
|
|
|
-- Nothing to do if the instantiation is not in the main unit
|
|
|
|
if not In_Extended_Main_Code_Unit (N) then
|
|
return;
|
|
end if;
|
|
|
|
Ent := Get_Generic_Entity (N);
|
|
From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
|
|
|
|
-- See if we need to analyze this instantiation. We analyze it if
|
|
-- either of the following conditions is met:
|
|
|
|
-- It is an inner level instantiation (since in this case it was
|
|
-- triggered by an outer level call from elaboration code), but
|
|
-- only if the instantiation is within the scope of the original
|
|
-- outer level call.
|
|
|
|
-- It is an outer level instantiation from elaboration code, or the
|
|
-- instantiated entity is in the same elaboration scope.
|
|
|
|
-- And in these cases, we will check both the inter-unit case and
|
|
-- the intra-unit (within a single unit) case.
|
|
|
|
C_Scope := Current_Scope;
|
|
|
|
if Present (Outer_Scope) and then Within (Scope (Ent), Outer_Scope) then
|
|
Set_C_Scope;
|
|
Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
|
|
|
|
elsif From_Elab_Code then
|
|
Set_C_Scope;
|
|
Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
|
|
|
|
elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
|
|
Set_C_Scope;
|
|
Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
|
|
|
|
-- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
|
|
-- set, then we will do the check, but only in the inter-unit case (this
|
|
-- is to accommodate unguarded elaboration calls from other units in
|
|
-- which this same mode is set). We inhibit warnings in this case, since
|
|
-- this instantiation is not occurring in elaboration code.
|
|
|
|
elsif Dynamic_Elaboration_Checks then
|
|
Set_C_Scope;
|
|
Check_A_Call
|
|
(N,
|
|
Ent,
|
|
Standard_Standard,
|
|
Inter_Unit_Only => True,
|
|
Generate_Warnings => False);
|
|
|
|
else
|
|
return;
|
|
end if;
|
|
end Check_Elab_Instantiation;
|
|
|
|
-------------------------
|
|
-- Check_Internal_Call --
|
|
-------------------------
|
|
|
|
procedure Check_Internal_Call
|
|
(N : Node_Id;
|
|
E : Entity_Id;
|
|
Outer_Scope : Entity_Id;
|
|
Orig_Ent : Entity_Id)
|
|
is
|
|
function Within_Initial_Condition (Call : Node_Id) return Boolean;
|
|
-- Determine whether call Call occurs within pragma Initial_Condition or
|
|
-- pragma Check with check_kind set to Initial_Condition.
|
|
|
|
------------------------------
|
|
-- Within_Initial_Condition --
|
|
------------------------------
|
|
|
|
function Within_Initial_Condition (Call : Node_Id) return Boolean is
|
|
Args : List_Id;
|
|
Nam : Name_Id;
|
|
Par : Node_Id;
|
|
|
|
begin
|
|
-- Traverse the parent chain looking for an enclosing pragma
|
|
|
|
Par := Call;
|
|
while Present (Par) loop
|
|
if Nkind (Par) = N_Pragma then
|
|
Nam := Pragma_Name (Par);
|
|
|
|
-- Pragma Initial_Condition appears in its alternative from as
|
|
-- Check (Initial_Condition, ...).
|
|
|
|
if Nam = Name_Check then
|
|
Args := Pragma_Argument_Associations (Par);
|
|
|
|
-- Pragma Check should have at least two arguments
|
|
|
|
pragma Assert (Present (Args));
|
|
|
|
return
|
|
Chars (Expression (First (Args))) = Name_Initial_Condition;
|
|
|
|
-- Direct match
|
|
|
|
elsif Nam = Name_Initial_Condition then
|
|
return True;
|
|
|
|
-- Since pragmas are never nested within other pragmas, stop
|
|
-- the traversal.
|
|
|
|
else
|
|
return False;
|
|
end if;
|
|
|
|
-- Prevent the search from going too far
|
|
|
|
elsif Is_Body_Or_Package_Declaration (Par) then
|
|
exit;
|
|
end if;
|
|
|
|
Par := Parent (Par);
|
|
|
|
-- If assertions are not enabled, the check pragma is rewritten
|
|
-- as an if_statement in sem_prag, to generate various warnings
|
|
-- on boolean expressions. Retrieve the original pragma.
|
|
|
|
if Nkind (Original_Node (Par)) = N_Pragma then
|
|
Par := Original_Node (Par);
|
|
end if;
|
|
end loop;
|
|
|
|
return False;
|
|
end Within_Initial_Condition;
|
|
|
|
-- Local variables
|
|
|
|
Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
|
|
|
|
-- Start of processing for Check_Internal_Call
|
|
|
|
begin
|
|
-- For P'Access, we want to warn if the -gnatw.f switch is set, and the
|
|
-- node comes from source.
|
|
|
|
if Nkind (N) = N_Attribute_Reference
|
|
and then ((not Warn_On_Elab_Access and then not Debug_Flag_Dot_O)
|
|
or else not Comes_From_Source (N))
|
|
then
|
|
return;
|
|
|
|
-- If not function or procedure call, instantiation, or 'Access, then
|
|
-- ignore call (this happens in some error cases and rewriting cases).
|
|
|
|
elsif not Nkind_In (N, N_Attribute_Reference,
|
|
N_Function_Call,
|
|
N_Procedure_Call_Statement)
|
|
and then not Inst_Case
|
|
then
|
|
return;
|
|
|
|
-- Nothing to do if this is a call or instantiation that has already
|
|
-- been found to be a sure ABE.
|
|
|
|
elsif Nkind (N) /= N_Attribute_Reference and then ABE_Is_Certain (N) then
|
|
return;
|
|
|
|
-- Nothing to do if errors already detected (avoid cascaded errors)
|
|
|
|
elsif Serious_Errors_Detected /= 0 then
|
|
return;
|
|
|
|
-- Nothing to do if not in full analysis mode
|
|
|
|
elsif not Full_Analysis then
|
|
return;
|
|
|
|
-- Nothing to do if analyzing in special spec-expression mode, since the
|
|
-- call is not actually being made at this time.
|
|
|
|
elsif In_Spec_Expression then
|
|
return;
|
|
|
|
-- Nothing to do for call to intrinsic subprogram
|
|
|
|
elsif Is_Intrinsic_Subprogram (E) then
|
|
return;
|
|
|
|
-- No need to trace local calls if checking task activation, because
|
|
-- other local bodies are elaborated already.
|
|
|
|
elsif In_Task_Activation then
|
|
return;
|
|
|
|
-- Nothing to do if call is within a generic unit
|
|
|
|
elsif Inside_A_Generic then
|
|
return;
|
|
|
|
-- Nothing to do when the call appears within pragma Initial_Condition.
|
|
-- The pragma is part of the elaboration statements of a package body
|
|
-- and may only call external subprograms or subprograms whose body is
|
|
-- already available.
|
|
|
|
elsif Within_Initial_Condition (N) then
|
|
return;
|
|
end if;
|
|
|
|
-- Delay this call if we are still delaying calls
|
|
|
|
if Delaying_Elab_Checks then
|
|
Delay_Check.Append (
|
|
(N => N,
|
|
E => E,
|
|
Orig_Ent => Orig_Ent,
|
|
Curscop => Current_Scope,
|
|
Outer_Scope => Outer_Scope,
|
|
From_Elab_Code => From_Elab_Code));
|
|
return;
|
|
|
|
-- Otherwise, call phase 2 continuation right now
|
|
|
|
else
|
|
Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
|
|
end if;
|
|
end Check_Internal_Call;
|
|
|
|
----------------------------------
|
|
-- Check_Internal_Call_Continue --
|
|
----------------------------------
|
|
|
|
procedure Check_Internal_Call_Continue
|
|
(N : Node_Id;
|
|
E : Entity_Id;
|
|
Outer_Scope : Entity_Id;
|
|
Orig_Ent : Entity_Id)
|
|
is
|
|
function Find_Elab_Reference (N : Node_Id) return Traverse_Result;
|
|
-- Function applied to each node as we traverse the body. Checks for
|
|
-- call or entity reference that needs checking, and if so checks it.
|
|
-- Always returns OK, so entire tree is traversed, except that as
|
|
-- described below subprogram bodies are skipped for now.
|
|
|
|
procedure Traverse is new Atree.Traverse_Proc (Find_Elab_Reference);
|
|
-- Traverse procedure using above Find_Elab_Reference function
|
|
|
|
-------------------------
|
|
-- Find_Elab_Reference --
|
|
-------------------------
|
|
|
|
function Find_Elab_Reference (N : Node_Id) return Traverse_Result is
|
|
Actual : Node_Id;
|
|
|
|
begin
|
|
-- If user has specified that there are no entry calls in elaboration
|
|
-- code, do not trace past an accept statement, because the rendez-
|
|
-- vous will happen after elaboration.
|
|
|
|
if Nkind_In (Original_Node (N), N_Accept_Statement,
|
|
N_Selective_Accept)
|
|
and then Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
|
|
then
|
|
return Abandon;
|
|
|
|
-- If we have a function call, check it
|
|
|
|
elsif Nkind (N) = N_Function_Call then
|
|
Check_Elab_Call (N, Outer_Scope);
|
|
return OK;
|
|
|
|
-- If we have a procedure call, check the call, and also check
|
|
-- arguments that are assignments (OUT or IN OUT mode formals).
|
|
|
|
elsif Nkind (N) = N_Procedure_Call_Statement then
|
|
Check_Elab_Call (N, Outer_Scope, In_Init_Proc => Is_Init_Proc (E));
|
|
|
|
Actual := First_Actual (N);
|
|
while Present (Actual) loop
|
|
if Known_To_Be_Assigned (Actual) then
|
|
Check_Elab_Assign (Actual);
|
|
end if;
|
|
|
|
Next_Actual (Actual);
|
|
end loop;
|
|
|
|
return OK;
|
|
|
|
-- If we have an access attribute for a subprogram, check it.
|
|
-- Suppress this behavior under debug flag.
|
|
|
|
elsif not Debug_Flag_Dot_UU
|
|
and then Nkind (N) = N_Attribute_Reference
|
|
and then Nam_In (Attribute_Name (N), Name_Access,
|
|
Name_Unrestricted_Access)
|
|
and then Is_Entity_Name (Prefix (N))
|
|
and then Is_Subprogram (Entity (Prefix (N)))
|
|
then
|
|
Check_Elab_Call (N, Outer_Scope);
|
|
return OK;
|
|
|
|
-- In SPARK mode, if we have an entity reference to a variable, then
|
|
-- check it. For now we consider any reference.
|
|
|
|
elsif SPARK_Mode = On
|
|
and then Nkind (N) in N_Has_Entity
|
|
and then Present (Entity (N))
|
|
and then Ekind (Entity (N)) = E_Variable
|
|
then
|
|
Check_Elab_Call (N, Outer_Scope);
|
|
return OK;
|
|
|
|
-- If we have a generic instantiation, check it
|
|
|
|
elsif Nkind (N) in N_Generic_Instantiation then
|
|
Check_Elab_Instantiation (N, Outer_Scope);
|
|
return OK;
|
|
|
|
-- Skip subprogram bodies that come from source (wait for call to
|
|
-- analyze these). The reason for the come from source test is to
|
|
-- avoid catching task bodies.
|
|
|
|
-- For task bodies, we should really avoid these too, waiting for the
|
|
-- task activation, but that's too much trouble to catch for now, so
|
|
-- we go in unconditionally. This is not so terrible, it means the
|
|
-- error backtrace is not quite complete, and we are too eager to
|
|
-- scan bodies of tasks that are unused, but this is hardly very
|
|
-- significant.
|
|
|
|
elsif Nkind (N) = N_Subprogram_Body
|
|
and then Comes_From_Source (N)
|
|
then
|
|
return Skip;
|
|
|
|
elsif Nkind (N) = N_Assignment_Statement
|
|
and then Comes_From_Source (N)
|
|
then
|
|
Check_Elab_Assign (Name (N));
|
|
return OK;
|
|
|
|
else
|
|
return OK;
|
|
end if;
|
|
end Find_Elab_Reference;
|
|
|
|
Inst_Case : constant Boolean := Is_Generic_Unit (E);
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
Ebody : Entity_Id;
|
|
Sbody : Node_Id;
|
|
|
|
-- Start of processing for Check_Internal_Call_Continue
|
|
|
|
begin
|
|
-- Save outer level call if at outer level
|
|
|
|
if Elab_Call.Last = 0 then
|
|
Outer_Level_Sloc := Loc;
|
|
end if;
|
|
|
|
Elab_Visited.Append (E);
|
|
|
|
-- If the call is to a function that renames a literal, no check needed
|
|
|
|
if Ekind (E) = E_Enumeration_Literal then
|
|
return;
|
|
end if;
|
|
|
|
Sbody := Unit_Declaration_Node (E);
|
|
|
|
if not Nkind_In (Sbody, N_Subprogram_Body, N_Package_Body) then
|
|
Ebody := Corresponding_Body (Sbody);
|
|
|
|
if No (Ebody) then
|
|
return;
|
|
else
|
|
Sbody := Unit_Declaration_Node (Ebody);
|
|
end if;
|
|
end if;
|
|
|
|
-- If the body appears after the outer level call or instantiation then
|
|
-- we have an error case handled below.
|
|
|
|
if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
|
|
and then not In_Task_Activation
|
|
then
|
|
null;
|
|
|
|
-- If we have the instantiation case we are done, since we now
|
|
-- know that the body of the generic appeared earlier.
|
|
|
|
elsif Inst_Case then
|
|
return;
|
|
|
|
-- Otherwise we have a call, so we trace through the called body to see
|
|
-- if it has any problems.
|
|
|
|
else
|
|
pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
|
|
|
|
Elab_Call.Append ((Cloc => Loc, Ent => E));
|
|
|
|
if Debug_Flag_LL then
|
|
Write_Str ("Elab_Call.Last = ");
|
|
Write_Int (Int (Elab_Call.Last));
|
|
Write_Str (" Ent = ");
|
|
Write_Name (Chars (E));
|
|
Write_Str (" at ");
|
|
Write_Location (Sloc (N));
|
|
Write_Eol;
|
|
end if;
|
|
|
|
-- Now traverse declarations and statements of subprogram body. Note
|
|
-- that we cannot simply Traverse (Sbody), since traverse does not
|
|
-- normally visit subprogram bodies.
|
|
|
|
declare
|
|
Decl : Node_Id;
|
|
begin
|
|
Decl := First (Declarations (Sbody));
|
|
while Present (Decl) loop
|
|
Traverse (Decl);
|
|
Next (Decl);
|
|
end loop;
|
|
end;
|
|
|
|
Traverse (Handled_Statement_Sequence (Sbody));
|
|
|
|
Elab_Call.Decrement_Last;
|
|
return;
|
|
end if;
|
|
|
|
-- Here is the case of calling a subprogram where the body has not yet
|
|
-- been encountered. A warning message is needed, except if this is the
|
|
-- case of appearing within an aspect specification that results in
|
|
-- a check call, we do not really have such a situation, so no warning
|
|
-- is needed (e.g. the case of a precondition, where the call appears
|
|
-- textually before the body, but in actual fact is moved to the
|
|
-- appropriate subprogram body and so does not need a check).
|
|
|
|
declare
|
|
P : Node_Id;
|
|
O : Node_Id;
|
|
|
|
begin
|
|
P := Parent (N);
|
|
loop
|
|
-- Keep looking at parents if we are still in the subexpression
|
|
|
|
if Nkind (P) in N_Subexpr then
|
|
P := Parent (P);
|
|
|
|
-- Here P is the parent of the expression, check for special case
|
|
|
|
else
|
|
O := Original_Node (P);
|
|
|
|
-- Definitely not the special case if orig node is not a pragma
|
|
|
|
exit when Nkind (O) /= N_Pragma;
|
|
|
|
-- Check we have an If statement or a null statement (happens
|
|
-- when the If has been expanded to be True).
|
|
|
|
exit when not Nkind_In (P, N_If_Statement, N_Null_Statement);
|
|
|
|
-- Our special case will be indicated either by the pragma
|
|
-- coming from an aspect ...
|
|
|
|
if Present (Corresponding_Aspect (O)) then
|
|
return;
|
|
|
|
-- Or, in the case of an initial condition, specifically by a
|
|
-- Check pragma specifying an Initial_Condition check.
|
|
|
|
elsif Pragma_Name (O) = Name_Check
|
|
and then
|
|
Chars
|
|
(Expression (First (Pragma_Argument_Associations (O)))) =
|
|
Name_Initial_Condition
|
|
then
|
|
return;
|
|
|
|
-- For anything else, we have an error
|
|
|
|
else
|
|
exit;
|
|
end if;
|
|
end if;
|
|
end loop;
|
|
end;
|
|
|
|
-- Not that special case, warning and dynamic check is required
|
|
|
|
-- If we have nothing in the call stack, then this is at the outer
|
|
-- level, and the ABE is bound to occur, unless it's a 'Access, or
|
|
-- it's a renaming.
|
|
|
|
if Elab_Call.Last = 0 then
|
|
Error_Msg_Warn := SPARK_Mode /= On;
|
|
|
|
declare
|
|
Insert_Check : Boolean := True;
|
|
-- This flag is set to True if an elaboration check should be
|
|
-- inserted.
|
|
|
|
begin
|
|
if Inst_Case then
|
|
Error_Msg_NE
|
|
("cannot instantiate& before body seen<<", N, Orig_Ent);
|
|
|
|
elsif Nkind (N) = N_Attribute_Reference then
|
|
Error_Msg_NE
|
|
("Access attribute of & before body seen<<", N, Orig_Ent);
|
|
Error_Msg_N ("\possible Program_Error on later references<", N);
|
|
Insert_Check := False;
|
|
|
|
elsif Nkind (Unit_Declaration_Node (Orig_Ent)) /=
|
|
N_Subprogram_Renaming_Declaration
|
|
then
|
|
Error_Msg_NE
|
|
("cannot call& before body seen<<", N, Orig_Ent);
|
|
|
|
elsif not Is_Generic_Actual_Subprogram (Orig_Ent) then
|
|
Insert_Check := False;
|
|
end if;
|
|
|
|
if Insert_Check then
|
|
Error_Msg_N ("\Program_Error [<<", N);
|
|
Insert_Elab_Check (N);
|
|
end if;
|
|
end;
|
|
|
|
-- Call is not at outer level
|
|
|
|
else
|
|
-- Deal with dynamic elaboration check
|
|
|
|
if not Elaboration_Checks_Suppressed (E) then
|
|
Set_Elaboration_Entity_Required (E);
|
|
|
|
-- Case of no elaboration entity allocated yet
|
|
|
|
if No (Elaboration_Entity (E)) then
|
|
|
|
-- Create object declaration for elaboration entity, and put it
|
|
-- just in front of the spec of the subprogram or generic unit,
|
|
-- in the same scope as this unit. The subprogram may be over-
|
|
-- loaded, so make the name of elaboration entity unique by
|
|
-- means of a numeric suffix.
|
|
|
|
declare
|
|
Loce : constant Source_Ptr := Sloc (E);
|
|
Ent : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc,
|
|
Chars => New_External_Name (Chars (E), 'E', -1));
|
|
|
|
begin
|
|
Set_Elaboration_Entity (E, Ent);
|
|
Push_Scope (Scope (E));
|
|
|
|
Insert_Action (Declaration_Node (E),
|
|
Make_Object_Declaration (Loce,
|
|
Defining_Identifier => Ent,
|
|
Object_Definition =>
|
|
New_Occurrence_Of (Standard_Short_Integer, Loce),
|
|
Expression =>
|
|
Make_Integer_Literal (Loc, Uint_0)));
|
|
|
|
-- Set elaboration flag at the point of the body
|
|
|
|
Set_Elaboration_Flag (Sbody, E);
|
|
|
|
-- Kill current value indication. This is necessary because
|
|
-- the tests of this flag are inserted out of sequence and
|
|
-- must not pick up bogus indications of the wrong constant
|
|
-- value. Also, this is never a true constant, since one way
|
|
-- or another, it gets reset.
|
|
|
|
Set_Current_Value (Ent, Empty);
|
|
Set_Last_Assignment (Ent, Empty);
|
|
Set_Is_True_Constant (Ent, False);
|
|
Pop_Scope;
|
|
end;
|
|
end if;
|
|
|
|
-- Generate check of the elaboration counter
|
|
|
|
Insert_Elab_Check (N,
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Elaborated,
|
|
Prefix => New_Occurrence_Of (E, Loc)));
|
|
end if;
|
|
|
|
-- Generate the warning
|
|
|
|
if not Suppress_Elaboration_Warnings (E)
|
|
and then not Elaboration_Checks_Suppressed (E)
|
|
|
|
-- Suppress this warning if we have a function call that occurred
|
|
-- within an assertion expression, since we can get false warnings
|
|
-- in this case, due to the out of order handling in this case.
|
|
|
|
and then
|
|
(Nkind (Original_Node (N)) /= N_Function_Call
|
|
or else not In_Assertion_Expression_Pragma (Original_Node (N)))
|
|
then
|
|
Error_Msg_Warn := SPARK_Mode /= On;
|
|
|
|
if Inst_Case then
|
|
Error_Msg_NE
|
|
("instantiation of& may occur before body is seen<l<",
|
|
N, Orig_Ent);
|
|
else
|
|
-- A rather specific check. For Finalize/Adjust/Initialize,
|
|
-- if the type has Warnings_Off set, suppress the warning.
|
|
|
|
if Nam_In (Chars (E), Name_Adjust,
|
|
Name_Finalize,
|
|
Name_Initialize)
|
|
and then Present (First_Formal (E))
|
|
then
|
|
declare
|
|
T : constant Entity_Id := Etype (First_Formal (E));
|
|
begin
|
|
if Is_Controlled (T) then
|
|
if Warnings_Off (T)
|
|
or else (Ekind (T) = E_Private_Type
|
|
and then Warnings_Off (Full_View (T)))
|
|
then
|
|
goto Output;
|
|
end if;
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
-- Go ahead and give warning if not this special case
|
|
|
|
Error_Msg_NE
|
|
("call to& may occur before body is seen<l<", N, Orig_Ent);
|
|
end if;
|
|
|
|
Error_Msg_N ("\Program_Error ]<l<", N);
|
|
|
|
-- There is no need to query the elaboration warning message flags
|
|
-- because the main message is an error, not a warning, therefore
|
|
-- all the clarification messages produces by Output_Calls must be
|
|
-- emitted unconditionally.
|
|
|
|
<<Output>>
|
|
|
|
Output_Calls (N, Check_Elab_Flag => False);
|
|
end if;
|
|
end if;
|
|
|
|
-- Set flag to suppress further warnings on same subprogram
|
|
-- unless in all errors mode
|
|
|
|
if not All_Errors_Mode then
|
|
Set_Suppress_Elaboration_Warnings (E);
|
|
end if;
|
|
end Check_Internal_Call_Continue;
|
|
|
|
---------------------------
|
|
-- Check_Task_Activation --
|
|
---------------------------
|
|
|
|
procedure Check_Task_Activation (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Inter_Procs : constant Elist_Id := New_Elmt_List;
|
|
Intra_Procs : constant Elist_Id := New_Elmt_List;
|
|
Ent : Entity_Id;
|
|
P : Entity_Id;
|
|
Task_Scope : Entity_Id;
|
|
Cunit_SC : Boolean := False;
|
|
Decl : Node_Id;
|
|
Elmt : Elmt_Id;
|
|
Enclosing : Entity_Id;
|
|
|
|
procedure Add_Task_Proc (Typ : Entity_Id);
|
|
-- Add to Task_Procs the task body procedure(s) of task types in Typ.
|
|
-- For record types, this procedure recurses over component types.
|
|
|
|
procedure Collect_Tasks (Decls : List_Id);
|
|
-- Collect the types of the tasks that are to be activated in the given
|
|
-- list of declarations, in order to perform elaboration checks on the
|
|
-- corresponding task procedures which are called implicitly here.
|
|
|
|
function Outer_Unit (E : Entity_Id) return Entity_Id;
|
|
-- find enclosing compilation unit of Entity, ignoring subunits, or
|
|
-- else enclosing subprogram. If E is not a package, there is no need
|
|
-- for inter-unit elaboration checks.
|
|
|
|
-------------------
|
|
-- Add_Task_Proc --
|
|
-------------------
|
|
|
|
procedure Add_Task_Proc (Typ : Entity_Id) is
|
|
Comp : Entity_Id;
|
|
Proc : Entity_Id := Empty;
|
|
|
|
begin
|
|
if Is_Task_Type (Typ) then
|
|
Proc := Get_Task_Body_Procedure (Typ);
|
|
|
|
elsif Is_Array_Type (Typ)
|
|
and then Has_Task (Base_Type (Typ))
|
|
then
|
|
Add_Task_Proc (Component_Type (Typ));
|
|
|
|
elsif Is_Record_Type (Typ)
|
|
and then Has_Task (Base_Type (Typ))
|
|
then
|
|
Comp := First_Component (Typ);
|
|
while Present (Comp) loop
|
|
Add_Task_Proc (Etype (Comp));
|
|
Comp := Next_Component (Comp);
|
|
end loop;
|
|
end if;
|
|
|
|
-- If the task type is another unit, we will perform the usual
|
|
-- elaboration check on its enclosing unit. If the type is in the
|
|
-- same unit, we can trace the task body as for an internal call,
|
|
-- but we only need to examine other external calls, because at
|
|
-- the point the task is activated, internal subprogram bodies
|
|
-- will have been elaborated already. We keep separate lists for
|
|
-- each kind of task.
|
|
|
|
-- Skip this test if errors have occurred, since in this case
|
|
-- we can get false indications.
|
|
|
|
if Serious_Errors_Detected /= 0 then
|
|
return;
|
|
end if;
|
|
|
|
if Present (Proc) then
|
|
if Outer_Unit (Scope (Proc)) = Enclosing then
|
|
|
|
if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
|
|
and then
|
|
(not Is_Generic_Instance (Scope (Proc))
|
|
or else Scope (Proc) = Scope (Defining_Identifier (Decl)))
|
|
then
|
|
Error_Msg_Warn := SPARK_Mode /= On;
|
|
Error_Msg_N
|
|
("task will be activated before elaboration of its body<<",
|
|
Decl);
|
|
Error_Msg_N ("\Program_Error [<<", Decl);
|
|
|
|
elsif Present
|
|
(Corresponding_Body (Unit_Declaration_Node (Proc)))
|
|
then
|
|
Append_Elmt (Proc, Intra_Procs);
|
|
end if;
|
|
|
|
else
|
|
-- No need for multiple entries of the same type
|
|
|
|
Elmt := First_Elmt (Inter_Procs);
|
|
while Present (Elmt) loop
|
|
if Node (Elmt) = Proc then
|
|
return;
|
|
end if;
|
|
|
|
Next_Elmt (Elmt);
|
|
end loop;
|
|
|
|
Append_Elmt (Proc, Inter_Procs);
|
|
end if;
|
|
end if;
|
|
end Add_Task_Proc;
|
|
|
|
-------------------
|
|
-- Collect_Tasks --
|
|
-------------------
|
|
|
|
procedure Collect_Tasks (Decls : List_Id) is
|
|
begin
|
|
if Present (Decls) then
|
|
Decl := First (Decls);
|
|
while Present (Decl) loop
|
|
if Nkind (Decl) = N_Object_Declaration
|
|
and then Has_Task (Etype (Defining_Identifier (Decl)))
|
|
then
|
|
Add_Task_Proc (Etype (Defining_Identifier (Decl)));
|
|
end if;
|
|
|
|
Next (Decl);
|
|
end loop;
|
|
end if;
|
|
end Collect_Tasks;
|
|
|
|
----------------
|
|
-- Outer_Unit --
|
|
----------------
|
|
|
|
function Outer_Unit (E : Entity_Id) return Entity_Id is
|
|
Outer : Entity_Id;
|
|
|
|
begin
|
|
Outer := E;
|
|
while Present (Outer) loop
|
|
if Elaboration_Checks_Suppressed (Outer) then
|
|
Cunit_SC := True;
|
|
end if;
|
|
|
|
exit when Is_Child_Unit (Outer)
|
|
or else Scope (Outer) = Standard_Standard
|
|
or else Ekind (Outer) /= E_Package;
|
|
Outer := Scope (Outer);
|
|
end loop;
|
|
|
|
return Outer;
|
|
end Outer_Unit;
|
|
|
|
-- Start of processing for Check_Task_Activation
|
|
|
|
begin
|
|
Enclosing := Outer_Unit (Current_Scope);
|
|
|
|
-- Find all tasks declared in the current unit
|
|
|
|
if Nkind (N) = N_Package_Body then
|
|
P := Unit_Declaration_Node (Corresponding_Spec (N));
|
|
|
|
Collect_Tasks (Declarations (N));
|
|
Collect_Tasks (Visible_Declarations (Specification (P)));
|
|
Collect_Tasks (Private_Declarations (Specification (P)));
|
|
|
|
elsif Nkind (N) = N_Package_Declaration then
|
|
Collect_Tasks (Visible_Declarations (Specification (N)));
|
|
Collect_Tasks (Private_Declarations (Specification (N)));
|
|
|
|
else
|
|
Collect_Tasks (Declarations (N));
|
|
end if;
|
|
|
|
-- We only perform detailed checks in all tasks that are library level
|
|
-- entities. If the master is a subprogram or task, activation will
|
|
-- depend on the activation of the master itself.
|
|
|
|
-- Should dynamic checks be added in the more general case???
|
|
|
|
if Ekind (Enclosing) /= E_Package then
|
|
return;
|
|
end if;
|
|
|
|
-- For task types defined in other units, we want the unit containing
|
|
-- the task body to be elaborated before the current one.
|
|
|
|
Elmt := First_Elmt (Inter_Procs);
|
|
while Present (Elmt) loop
|
|
Ent := Node (Elmt);
|
|
Task_Scope := Outer_Unit (Scope (Ent));
|
|
|
|
if not Is_Compilation_Unit (Task_Scope) then
|
|
null;
|
|
|
|
elsif Suppress_Elaboration_Warnings (Task_Scope)
|
|
or else Elaboration_Checks_Suppressed (Task_Scope)
|
|
then
|
|
null;
|
|
|
|
elsif Dynamic_Elaboration_Checks then
|
|
if not Elaboration_Checks_Suppressed (Ent)
|
|
and then not Cunit_SC
|
|
and then
|
|
not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
|
|
then
|
|
-- Runtime elaboration check required. Generate check of the
|
|
-- elaboration counter for the unit containing the entity.
|
|
|
|
Insert_Elab_Check (N,
|
|
Make_Attribute_Reference (Loc,
|
|
Attribute_Name => Name_Elaborated,
|
|
Prefix =>
|
|
New_Occurrence_Of (Spec_Entity (Task_Scope), Loc)));
|
|
end if;
|
|
|
|
else
|
|
-- Force the binder to elaborate other unit first
|
|
|
|
if not Suppress_Elaboration_Warnings (Ent)
|
|
and then not Elaboration_Checks_Suppressed (Ent)
|
|
and then Elab_Info_Messages
|
|
and then not Suppress_Elaboration_Warnings (Task_Scope)
|
|
and then not Elaboration_Checks_Suppressed (Task_Scope)
|
|
then
|
|
Error_Msg_Node_2 := Task_Scope;
|
|
Error_Msg_NE
|
|
("info: activation of an instance of task type&" &
|
|
" requires pragma Elaborate_All on &?$?", N, Ent);
|
|
end if;
|
|
|
|
Activate_Elaborate_All_Desirable (N, Task_Scope);
|
|
Set_Suppress_Elaboration_Warnings (Task_Scope);
|
|
end if;
|
|
|
|
Next_Elmt (Elmt);
|
|
end loop;
|
|
|
|
-- For tasks declared in the current unit, trace other calls within
|
|
-- the task procedure bodies, which are available.
|
|
|
|
In_Task_Activation := True;
|
|
|
|
Elmt := First_Elmt (Intra_Procs);
|
|
while Present (Elmt) loop
|
|
Ent := Node (Elmt);
|
|
Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
|
|
Next_Elmt (Elmt);
|
|
end loop;
|
|
|
|
In_Task_Activation := False;
|
|
end Check_Task_Activation;
|
|
|
|
-------------------------------
|
|
-- Is_Call_Of_Generic_Formal --
|
|
-------------------------------
|
|
|
|
function Is_Call_Of_Generic_Formal (N : Node_Id) return Boolean is
|
|
begin
|
|
return Nkind_In (N, N_Function_Call, N_Procedure_Call_Statement)
|
|
|
|
-- Always return False if debug flag -gnatd.G is set
|
|
|
|
and then not Debug_Flag_Dot_GG
|
|
|
|
-- For now, we detect this by looking for the strange identifier
|
|
-- node, whose Chars reflect the name of the generic formal, but
|
|
-- the Chars of the Entity references the generic actual.
|
|
|
|
and then Nkind (Name (N)) = N_Identifier
|
|
and then Chars (Name (N)) /= Chars (Entity (Name (N)));
|
|
end Is_Call_Of_Generic_Formal;
|
|
|
|
--------------------------------
|
|
-- Set_Elaboration_Constraint --
|
|
--------------------------------
|
|
|
|
procedure Set_Elaboration_Constraint
|
|
(Call : Node_Id;
|
|
Subp : Entity_Id;
|
|
Scop : Entity_Id)
|
|
is
|
|
Elab_Unit : Entity_Id;
|
|
|
|
-- Check whether this is a call to an Initialize subprogram for a
|
|
-- controlled type. Note that Call can also be a 'Access attribute
|
|
-- reference, which now generates an elaboration check.
|
|
|
|
Init_Call : constant Boolean :=
|
|
Nkind (Call) = N_Procedure_Call_Statement
|
|
and then Chars (Subp) = Name_Initialize
|
|
and then Comes_From_Source (Subp)
|
|
and then Present (Parameter_Associations (Call))
|
|
and then Is_Controlled (Etype (First_Actual (Call)));
|
|
begin
|
|
-- If the unit is mentioned in a with_clause of the current unit, it is
|
|
-- visible, and we can set the elaboration flag.
|
|
|
|
if Is_Immediately_Visible (Scop)
|
|
or else (Is_Child_Unit (Scop) and then Is_Visible_Lib_Unit (Scop))
|
|
then
|
|
Activate_Elaborate_All_Desirable (Call, Scop);
|
|
Set_Suppress_Elaboration_Warnings (Scop, True);
|
|
return;
|
|
end if;
|
|
|
|
-- If this is not an initialization call or a call using object notation
|
|
-- we know that the unit of the called entity is in the context, and
|
|
-- we can set the flag as well. The unit need not be visible if the call
|
|
-- occurs within an instantiation.
|
|
|
|
if Is_Init_Proc (Subp)
|
|
or else Init_Call
|
|
or else Nkind (Original_Node (Call)) = N_Selected_Component
|
|
then
|
|
null; -- detailed processing follows.
|
|
|
|
else
|
|
Activate_Elaborate_All_Desirable (Call, Scop);
|
|
Set_Suppress_Elaboration_Warnings (Scop, True);
|
|
return;
|
|
end if;
|
|
|
|
-- If the unit is not in the context, there must be an intermediate unit
|
|
-- that is, on which we need to place to elaboration flag. This happens
|
|
-- with init proc calls.
|
|
|
|
if Is_Init_Proc (Subp) or else Init_Call then
|
|
|
|
-- The initialization call is on an object whose type is not declared
|
|
-- in the same scope as the subprogram. The type of the object must
|
|
-- be a subtype of the type of operation. This object is the first
|
|
-- actual in the call.
|
|
|
|
declare
|
|
Typ : constant Entity_Id :=
|
|
Etype (First (Parameter_Associations (Call)));
|
|
begin
|
|
Elab_Unit := Scope (Typ);
|
|
while (Present (Elab_Unit))
|
|
and then not Is_Compilation_Unit (Elab_Unit)
|
|
loop
|
|
Elab_Unit := Scope (Elab_Unit);
|
|
end loop;
|
|
end;
|
|
|
|
-- If original node uses selected component notation, the prefix is
|
|
-- visible and determines the scope that must be elaborated. After
|
|
-- rewriting, the prefix is the first actual in the call.
|
|
|
|
elsif Nkind (Original_Node (Call)) = N_Selected_Component then
|
|
Elab_Unit := Scope (Etype (First (Parameter_Associations (Call))));
|
|
|
|
-- Not one of special cases above
|
|
|
|
else
|
|
-- Using previously computed scope. If the elaboration check is
|
|
-- done after analysis, the scope is not visible any longer, but
|
|
-- must still be in the context.
|
|
|
|
Elab_Unit := Scop;
|
|
end if;
|
|
|
|
Activate_Elaborate_All_Desirable (Call, Elab_Unit);
|
|
Set_Suppress_Elaboration_Warnings (Elab_Unit, True);
|
|
end Set_Elaboration_Constraint;
|
|
|
|
------------------------
|
|
-- Get_Referenced_Ent --
|
|
------------------------
|
|
|
|
function Get_Referenced_Ent (N : Node_Id) return Entity_Id is
|
|
Nam : Node_Id;
|
|
|
|
begin
|
|
if Nkind (N) in N_Has_Entity
|
|
and then Present (Entity (N))
|
|
and then Ekind (Entity (N)) = E_Variable
|
|
then
|
|
return Entity (N);
|
|
end if;
|
|
|
|
if Nkind (N) = N_Attribute_Reference then
|
|
Nam := Prefix (N);
|
|
else
|
|
Nam := Name (N);
|
|
end if;
|
|
|
|
if No (Nam) then
|
|
return Empty;
|
|
elsif Nkind (Nam) = N_Selected_Component then
|
|
return Entity (Selector_Name (Nam));
|
|
elsif not Is_Entity_Name (Nam) then
|
|
return Empty;
|
|
else
|
|
return Entity (Nam);
|
|
end if;
|
|
end Get_Referenced_Ent;
|
|
|
|
----------------------
|
|
-- Has_Generic_Body --
|
|
----------------------
|
|
|
|
function Has_Generic_Body (N : Node_Id) return Boolean is
|
|
Ent : constant Entity_Id := Get_Generic_Entity (N);
|
|
Decl : constant Node_Id := Unit_Declaration_Node (Ent);
|
|
Scop : Entity_Id;
|
|
|
|
function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
|
|
-- Determine if the list of nodes headed by N and linked by Next
|
|
-- contains a package body for the package spec entity E, and if so
|
|
-- return the package body. If not, then returns Empty.
|
|
|
|
function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
|
|
-- This procedure is called load the unit whose name is given by Nam.
|
|
-- This unit is being loaded to see whether it contains an optional
|
|
-- generic body. The returned value is the loaded unit, which is always
|
|
-- a package body (only package bodies can contain other entities in the
|
|
-- sense in which Has_Generic_Body is interested). We only attempt to
|
|
-- load bodies if we are generating code. If we are in semantics check
|
|
-- only mode, then it would be wrong to load bodies that are not
|
|
-- required from a semantic point of view, so in this case we return
|
|
-- Empty. The result is that the caller may incorrectly decide that a
|
|
-- generic spec does not have a body when in fact it does, but the only
|
|
-- harm in this is that some warnings on elaboration problems may be
|
|
-- lost in semantic checks only mode, which is not big loss. We also
|
|
-- return Empty if we go for a body and it is not there.
|
|
|
|
function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
|
|
-- PE is the entity for a package spec. This function locates the
|
|
-- corresponding package body, returning Empty if none is found. The
|
|
-- package body returned is fully parsed but may not yet be analyzed,
|
|
-- so only syntactic fields should be referenced.
|
|
|
|
------------------
|
|
-- Find_Body_In --
|
|
------------------
|
|
|
|
function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
|
|
Nod : Node_Id;
|
|
|
|
begin
|
|
Nod := N;
|
|
while Present (Nod) loop
|
|
|
|
-- If we found the package body we are looking for, return it
|
|
|
|
if Nkind (Nod) = N_Package_Body
|
|
and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
|
|
then
|
|
return Nod;
|
|
|
|
-- If we found the stub for the body, go after the subunit,
|
|
-- loading it if necessary.
|
|
|
|
elsif Nkind (Nod) = N_Package_Body_Stub
|
|
and then Chars (Defining_Identifier (Nod)) = Chars (E)
|
|
then
|
|
if Present (Library_Unit (Nod)) then
|
|
return Unit (Library_Unit (Nod));
|
|
|
|
else
|
|
return Load_Package_Body (Get_Unit_Name (Nod));
|
|
end if;
|
|
|
|
-- If neither package body nor stub, keep looking on chain
|
|
|
|
else
|
|
Next (Nod);
|
|
end if;
|
|
end loop;
|
|
|
|
return Empty;
|
|
end Find_Body_In;
|
|
|
|
-----------------------
|
|
-- Load_Package_Body --
|
|
-----------------------
|
|
|
|
function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
|
|
U : Unit_Number_Type;
|
|
|
|
begin
|
|
if Operating_Mode /= Generate_Code then
|
|
return Empty;
|
|
else
|
|
U :=
|
|
Load_Unit
|
|
(Load_Name => Nam,
|
|
Required => False,
|
|
Subunit => False,
|
|
Error_Node => N);
|
|
|
|
if U = No_Unit then
|
|
return Empty;
|
|
else
|
|
return Unit (Cunit (U));
|
|
end if;
|
|
end if;
|
|
end Load_Package_Body;
|
|
|
|
-------------------------------
|
|
-- Locate_Corresponding_Body --
|
|
-------------------------------
|
|
|
|
function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
|
|
Spec : constant Node_Id := Declaration_Node (PE);
|
|
Decl : constant Node_Id := Parent (Spec);
|
|
Scop : constant Entity_Id := Scope (PE);
|
|
PBody : Node_Id;
|
|
|
|
begin
|
|
if Is_Library_Level_Entity (PE) then
|
|
|
|
-- If package is a library unit that requires a body, we have no
|
|
-- choice but to go after that body because it might contain an
|
|
-- optional body for the original generic package.
|
|
|
|
if Unit_Requires_Body (PE) then
|
|
|
|
-- Load the body. Note that we are a little careful here to use
|
|
-- Spec to get the unit number, rather than PE or Decl, since
|
|
-- in the case where the package is itself a library level
|
|
-- instantiation, Spec will properly reference the generic
|
|
-- template, which is what we really want.
|
|
|
|
return
|
|
Load_Package_Body
|
|
(Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
|
|
|
|
-- But if the package is a library unit that does NOT require
|
|
-- a body, then no body is permitted, so we are sure that there
|
|
-- is no body for the original generic package.
|
|
|
|
else
|
|
return Empty;
|
|
end if;
|
|
|
|
-- Otherwise look and see if we are embedded in a further package
|
|
|
|
elsif Is_Package_Or_Generic_Package (Scop) then
|
|
|
|
-- If so, get the body of the enclosing package, and look in
|
|
-- its package body for the package body we are looking for.
|
|
|
|
PBody := Locate_Corresponding_Body (Scop);
|
|
|
|
if No (PBody) then
|
|
return Empty;
|
|
else
|
|
return Find_Body_In (PE, First (Declarations (PBody)));
|
|
end if;
|
|
|
|
-- If we are not embedded in a further package, then the body
|
|
-- must be in the same declarative part as we are.
|
|
|
|
else
|
|
return Find_Body_In (PE, Next (Decl));
|
|
end if;
|
|
end Locate_Corresponding_Body;
|
|
|
|
-- Start of processing for Has_Generic_Body
|
|
|
|
begin
|
|
if Present (Corresponding_Body (Decl)) then
|
|
return True;
|
|
|
|
elsif Unit_Requires_Body (Ent) then
|
|
return True;
|
|
|
|
-- Compilation units cannot have optional bodies
|
|
|
|
elsif Is_Compilation_Unit (Ent) then
|
|
return False;
|
|
|
|
-- Otherwise look at what scope we are in
|
|
|
|
else
|
|
Scop := Scope (Ent);
|
|
|
|
-- Case of entity is in other than a package spec, in this case
|
|
-- the body, if present, must be in the same declarative part.
|
|
|
|
if not Is_Package_Or_Generic_Package (Scop) then
|
|
declare
|
|
P : Node_Id;
|
|
|
|
begin
|
|
-- Declaration node may get us a spec, so if so, go to
|
|
-- the parent declaration.
|
|
|
|
P := Declaration_Node (Ent);
|
|
while not Is_List_Member (P) loop
|
|
P := Parent (P);
|
|
end loop;
|
|
|
|
return Present (Find_Body_In (Ent, Next (P)));
|
|
end;
|
|
|
|
-- If the entity is in a package spec, then we have to locate
|
|
-- the corresponding package body, and look there.
|
|
|
|
else
|
|
declare
|
|
PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
|
|
|
|
begin
|
|
if No (PBody) then
|
|
return False;
|
|
else
|
|
return
|
|
Present
|
|
(Find_Body_In (Ent, (First (Declarations (PBody)))));
|
|
end if;
|
|
end;
|
|
end if;
|
|
end if;
|
|
end Has_Generic_Body;
|
|
|
|
-----------------------
|
|
-- Insert_Elab_Check --
|
|
-----------------------
|
|
|
|
procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
|
|
Nod : Node_Id;
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
Chk : Node_Id;
|
|
-- The check (N_Raise_Program_Error) node to be inserted
|
|
|
|
begin
|
|
-- If expansion is disabled, do not generate any checks. Also
|
|
-- skip checks if any subunits are missing because in either
|
|
-- case we lack the full information that we need, and no object
|
|
-- file will be created in any case.
|
|
|
|
if not Expander_Active or else Subunits_Missing then
|
|
return;
|
|
end if;
|
|
|
|
-- If we have a generic instantiation, where Instance_Spec is set,
|
|
-- then this field points to a generic instance spec that has
|
|
-- been inserted before the instantiation node itself, so that
|
|
-- is where we want to insert a check.
|
|
|
|
if Nkind (N) in N_Generic_Instantiation
|
|
and then Present (Instance_Spec (N))
|
|
then
|
|
Nod := Instance_Spec (N);
|
|
else
|
|
Nod := N;
|
|
end if;
|
|
|
|
-- Build check node, possibly with condition
|
|
|
|
Chk :=
|
|
Make_Raise_Program_Error (Loc, Reason => PE_Access_Before_Elaboration);
|
|
|
|
if Present (C) then
|
|
Set_Condition (Chk, Make_Op_Not (Loc, Right_Opnd => C));
|
|
end if;
|
|
|
|
-- If we are inserting at the top level, insert in Aux_Decls
|
|
|
|
if Nkind (Parent (Nod)) = N_Compilation_Unit then
|
|
declare
|
|
ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
|
|
|
|
begin
|
|
if No (Declarations (ADN)) then
|
|
Set_Declarations (ADN, New_List (Chk));
|
|
else
|
|
Append_To (Declarations (ADN), Chk);
|
|
end if;
|
|
|
|
Analyze (Chk);
|
|
end;
|
|
|
|
-- Otherwise just insert as an action on the node in question
|
|
|
|
else
|
|
Insert_Action (Nod, Chk);
|
|
end if;
|
|
end Insert_Elab_Check;
|
|
|
|
-------------------------------
|
|
-- Is_Finalization_Procedure --
|
|
-------------------------------
|
|
|
|
function Is_Finalization_Procedure (Id : Entity_Id) return Boolean is
|
|
begin
|
|
-- Check whether Id is a procedure with at least one parameter
|
|
|
|
if Ekind (Id) = E_Procedure and then Present (First_Formal (Id)) then
|
|
declare
|
|
Typ : constant Entity_Id := Etype (First_Formal (Id));
|
|
Deep_Fin : Entity_Id := Empty;
|
|
Fin : Entity_Id := Empty;
|
|
|
|
begin
|
|
-- If the type of the first formal does not require finalization
|
|
-- actions, then this is definitely not [Deep_]Finalize.
|
|
|
|
if not Needs_Finalization (Typ) then
|
|
return False;
|
|
end if;
|
|
|
|
-- At this point we have the following scenario:
|
|
|
|
-- procedure Name (Param1 : [in] [out] Ctrl[; Param2 : ...]);
|
|
|
|
-- Recover the two possible versions of [Deep_]Finalize using the
|
|
-- type of the first parameter and compare with the input.
|
|
|
|
Deep_Fin := TSS (Typ, TSS_Deep_Finalize);
|
|
|
|
if Is_Controlled (Typ) then
|
|
Fin := Find_Prim_Op (Typ, Name_Finalize);
|
|
end if;
|
|
|
|
return (Present (Deep_Fin) and then Id = Deep_Fin)
|
|
or else (Present (Fin) and then Id = Fin);
|
|
end;
|
|
end if;
|
|
|
|
return False;
|
|
end Is_Finalization_Procedure;
|
|
|
|
------------------
|
|
-- Output_Calls --
|
|
------------------
|
|
|
|
procedure Output_Calls
|
|
(N : Node_Id;
|
|
Check_Elab_Flag : Boolean)
|
|
is
|
|
function Emit (Flag : Boolean) return Boolean;
|
|
-- Determine whether to emit an error message based on the combination
|
|
-- of flags Check_Elab_Flag and Flag.
|
|
|
|
function Is_Printable_Error_Name return Boolean;
|
|
-- An internal function, used to determine if a name, stored in the
|
|
-- Name_Buffer, is either a non-internal name, or is an internal name
|
|
-- that is printable by the error message circuits (i.e. it has a single
|
|
-- upper case letter at the end).
|
|
|
|
----------
|
|
-- Emit --
|
|
----------
|
|
|
|
function Emit (Flag : Boolean) return Boolean is
|
|
begin
|
|
if Check_Elab_Flag then
|
|
return Flag;
|
|
else
|
|
return True;
|
|
end if;
|
|
end Emit;
|
|
|
|
-----------------------------
|
|
-- Is_Printable_Error_Name --
|
|
-----------------------------
|
|
|
|
function Is_Printable_Error_Name return Boolean is
|
|
begin
|
|
if not Is_Internal_Name then
|
|
return True;
|
|
|
|
elsif Name_Len = 1 then
|
|
return False;
|
|
|
|
else
|
|
Name_Len := Name_Len - 1;
|
|
return not Is_Internal_Name;
|
|
end if;
|
|
end Is_Printable_Error_Name;
|
|
|
|
-- Local variables
|
|
|
|
Ent : Entity_Id;
|
|
|
|
-- Start of processing for Output_Calls
|
|
|
|
begin
|
|
for J in reverse 1 .. Elab_Call.Last loop
|
|
Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
|
|
|
|
Ent := Elab_Call.Table (J).Ent;
|
|
Get_Name_String (Chars (Ent));
|
|
|
|
-- Dynamic elaboration model, warnings controlled by -gnatwl
|
|
|
|
if Dynamic_Elaboration_Checks then
|
|
if Emit (Elab_Warnings) then
|
|
if Is_Generic_Unit (Ent) then
|
|
Error_Msg_NE ("\\?l?& instantiated #", N, Ent);
|
|
elsif Is_Init_Proc (Ent) then
|
|
Error_Msg_N ("\\?l?initialization procedure called #", N);
|
|
elsif Is_Printable_Error_Name then
|
|
Error_Msg_NE ("\\?l?& called #", N, Ent);
|
|
else
|
|
Error_Msg_N ("\\?l?called #", N);
|
|
end if;
|
|
end if;
|
|
|
|
-- Static elaboration model, info messages controlled by -gnatel
|
|
|
|
else
|
|
if Emit (Elab_Info_Messages) then
|
|
if Is_Generic_Unit (Ent) then
|
|
Error_Msg_NE ("\\?$?& instantiated #", N, Ent);
|
|
elsif Is_Init_Proc (Ent) then
|
|
Error_Msg_N ("\\?$?initialization procedure called #", N);
|
|
elsif Is_Printable_Error_Name then
|
|
Error_Msg_NE ("\\?$?& called #", N, Ent);
|
|
else
|
|
Error_Msg_N ("\\?$?called #", N);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end loop;
|
|
end Output_Calls;
|
|
|
|
----------------------------
|
|
-- Same_Elaboration_Scope --
|
|
----------------------------
|
|
|
|
function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
|
|
S1 : Entity_Id;
|
|
S2 : Entity_Id;
|
|
|
|
begin
|
|
-- Find elaboration scope for Scop1
|
|
-- This is either a subprogram or a compilation unit.
|
|
|
|
S1 := Scop1;
|
|
while S1 /= Standard_Standard
|
|
and then not Is_Compilation_Unit (S1)
|
|
and then Ekind_In (S1, E_Package, E_Protected_Type, E_Block)
|
|
loop
|
|
S1 := Scope (S1);
|
|
end loop;
|
|
|
|
-- Find elaboration scope for Scop2
|
|
|
|
S2 := Scop2;
|
|
while S2 /= Standard_Standard
|
|
and then not Is_Compilation_Unit (S2)
|
|
and then Ekind_In (S2, E_Package, E_Protected_Type, E_Block)
|
|
loop
|
|
S2 := Scope (S2);
|
|
end loop;
|
|
|
|
return S1 = S2;
|
|
end Same_Elaboration_Scope;
|
|
|
|
-----------------
|
|
-- Set_C_Scope --
|
|
-----------------
|
|
|
|
procedure Set_C_Scope is
|
|
begin
|
|
while not Is_Compilation_Unit (C_Scope) loop
|
|
C_Scope := Scope (C_Scope);
|
|
end loop;
|
|
end Set_C_Scope;
|
|
|
|
-----------------
|
|
-- Spec_Entity --
|
|
-----------------
|
|
|
|
function Spec_Entity (E : Entity_Id) return Entity_Id is
|
|
Decl : Node_Id;
|
|
|
|
begin
|
|
-- Check for case of body entity
|
|
-- Why is the check for E_Void needed???
|
|
|
|
if Ekind_In (E, E_Void, E_Subprogram_Body, E_Package_Body) then
|
|
Decl := E;
|
|
|
|
loop
|
|
Decl := Parent (Decl);
|
|
exit when Nkind (Decl) in N_Proper_Body;
|
|
end loop;
|
|
|
|
return Corresponding_Spec (Decl);
|
|
|
|
else
|
|
return E;
|
|
end if;
|
|
end Spec_Entity;
|
|
|
|
-------------------
|
|
-- Supply_Bodies --
|
|
-------------------
|
|
|
|
procedure Supply_Bodies (N : Node_Id) is
|
|
begin
|
|
if Nkind (N) = N_Subprogram_Declaration then
|
|
declare
|
|
Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
|
|
|
|
begin
|
|
-- Internal subprograms will already have a generated body, so
|
|
-- there is no need to provide a stub for them.
|
|
|
|
if No (Corresponding_Body (N)) then
|
|
declare
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
B : Node_Id;
|
|
Formals : constant List_Id := Copy_Parameter_List (Ent);
|
|
Nam : constant Entity_Id :=
|
|
Make_Defining_Identifier (Loc, Chars (Ent));
|
|
Spec : Node_Id;
|
|
Stats : constant List_Id :=
|
|
New_List
|
|
(Make_Raise_Program_Error (Loc,
|
|
Reason => PE_Access_Before_Elaboration));
|
|
|
|
begin
|
|
if Ekind (Ent) = E_Function then
|
|
Spec :=
|
|
Make_Function_Specification (Loc,
|
|
Defining_Unit_Name => Nam,
|
|
Parameter_Specifications => Formals,
|
|
Result_Definition =>
|
|
New_Copy_Tree
|
|
(Result_Definition (Specification (N))));
|
|
|
|
-- We cannot reliably make a return statement for this
|
|
-- body, but none is needed because the call raises
|
|
-- program error.
|
|
|
|
Set_Return_Present (Ent);
|
|
|
|
else
|
|
Spec :=
|
|
Make_Procedure_Specification (Loc,
|
|
Defining_Unit_Name => Nam,
|
|
Parameter_Specifications => Formals);
|
|
end if;
|
|
|
|
B := Make_Subprogram_Body (Loc,
|
|
Specification => Spec,
|
|
Declarations => New_List,
|
|
Handled_Statement_Sequence =>
|
|
Make_Handled_Sequence_Of_Statements (Loc, Stats));
|
|
Insert_After (N, B);
|
|
Analyze (B);
|
|
end;
|
|
end if;
|
|
end;
|
|
|
|
elsif Nkind (N) = N_Package_Declaration then
|
|
declare
|
|
Spec : constant Node_Id := Specification (N);
|
|
begin
|
|
Push_Scope (Defining_Unit_Name (Spec));
|
|
Supply_Bodies (Visible_Declarations (Spec));
|
|
Supply_Bodies (Private_Declarations (Spec));
|
|
Pop_Scope;
|
|
end;
|
|
end if;
|
|
end Supply_Bodies;
|
|
|
|
procedure Supply_Bodies (L : List_Id) is
|
|
Elmt : Node_Id;
|
|
begin
|
|
if Present (L) then
|
|
Elmt := First (L);
|
|
while Present (Elmt) loop
|
|
Supply_Bodies (Elmt);
|
|
Next (Elmt);
|
|
end loop;
|
|
end if;
|
|
end Supply_Bodies;
|
|
|
|
------------
|
|
-- Within --
|
|
------------
|
|
|
|
function Within (E1, E2 : Entity_Id) return Boolean is
|
|
Scop : Entity_Id;
|
|
begin
|
|
Scop := E1;
|
|
loop
|
|
if Scop = E2 then
|
|
return True;
|
|
elsif Scop = Standard_Standard then
|
|
return False;
|
|
else
|
|
Scop := Scope (Scop);
|
|
end if;
|
|
end loop;
|
|
end Within;
|
|
|
|
--------------------------
|
|
-- Within_Elaborate_All --
|
|
--------------------------
|
|
|
|
function Within_Elaborate_All
|
|
(Unit : Unit_Number_Type;
|
|
E : Entity_Id) return Boolean
|
|
is
|
|
type Unit_Number_Set is array (Main_Unit .. Last_Unit) of Boolean;
|
|
pragma Pack (Unit_Number_Set);
|
|
|
|
Seen : Unit_Number_Set := (others => False);
|
|
-- Seen (X) is True after we have seen unit X in the walk. This is used
|
|
-- to prevent processing the same unit more than once.
|
|
|
|
Result : Boolean := False;
|
|
|
|
procedure Helper (Unit : Unit_Number_Type);
|
|
-- This helper procedure does all the work for Within_Elaborate_All. It
|
|
-- walks the dependency graph, and sets Result to True if it finds an
|
|
-- appropriate Elaborate_All.
|
|
|
|
------------
|
|
-- Helper --
|
|
------------
|
|
|
|
procedure Helper (Unit : Unit_Number_Type) is
|
|
CU : constant Node_Id := Cunit (Unit);
|
|
|
|
Item : Node_Id;
|
|
Item2 : Node_Id;
|
|
Elab_Id : Entity_Id;
|
|
Par : Node_Id;
|
|
|
|
begin
|
|
if Seen (Unit) then
|
|
return;
|
|
else
|
|
Seen (Unit) := True;
|
|
end if;
|
|
|
|
-- First, check for Elaborate_Alls on this unit
|
|
|
|
Item := First (Context_Items (CU));
|
|
while Present (Item) loop
|
|
if Nkind (Item) = N_Pragma
|
|
and then Pragma_Name (Item) = Name_Elaborate_All
|
|
then
|
|
-- Return if some previous error on the pragma itself. The
|
|
-- pragma may be unanalyzed, because of a previous error, or
|
|
-- if it is the context of a subunit, inherited by its parent.
|
|
|
|
if Error_Posted (Item) or else not Analyzed (Item) then
|
|
return;
|
|
end if;
|
|
|
|
Elab_Id :=
|
|
Entity
|
|
(Expression (First (Pragma_Argument_Associations (Item))));
|
|
|
|
if E = Elab_Id then
|
|
Result := True;
|
|
return;
|
|
end if;
|
|
|
|
Par := Parent (Unit_Declaration_Node (Elab_Id));
|
|
|
|
Item2 := First (Context_Items (Par));
|
|
while Present (Item2) loop
|
|
if Nkind (Item2) = N_With_Clause
|
|
and then Entity (Name (Item2)) = E
|
|
and then not Limited_Present (Item2)
|
|
then
|
|
Result := True;
|
|
return;
|
|
end if;
|
|
|
|
Next (Item2);
|
|
end loop;
|
|
end if;
|
|
|
|
Next (Item);
|
|
end loop;
|
|
|
|
-- Second, recurse on with's. We could do this as part of the above
|
|
-- loop, but it's probably more efficient to have two loops, because
|
|
-- the relevant Elaborate_All is likely to be on the initial unit. In
|
|
-- other words, we're walking the with's breadth-first. This part is
|
|
-- only necessary in the dynamic elaboration model.
|
|
|
|
if Dynamic_Elaboration_Checks then
|
|
Item := First (Context_Items (CU));
|
|
while Present (Item) loop
|
|
if Nkind (Item) = N_With_Clause
|
|
and then not Limited_Present (Item)
|
|
then
|
|
-- Note: the following call to Get_Cunit_Unit_Number does a
|
|
-- linear search, which could be slow, but it's OK because
|
|
-- we're about to give a warning anyway. Also, there might
|
|
-- be hundreds of units, but not millions. If it turns out
|
|
-- to be a problem, we could store the Get_Cunit_Unit_Number
|
|
-- in each N_Compilation_Unit node, but that would involve
|
|
-- rearranging N_Compilation_Unit_Aux to make room.
|
|
|
|
Helper (Get_Cunit_Unit_Number (Library_Unit (Item)));
|
|
|
|
if Result then
|
|
return;
|
|
end if;
|
|
end if;
|
|
|
|
Next (Item);
|
|
end loop;
|
|
end if;
|
|
end Helper;
|
|
|
|
-- Start of processing for Within_Elaborate_All
|
|
|
|
begin
|
|
Helper (Unit);
|
|
return Result;
|
|
end Within_Elaborate_All;
|
|
|
|
end Sem_Elab;
|