843 lines
28 KiB
Ada
843 lines
28 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S E M _ D I S T --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Atree; use Atree;
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with Casing; use Casing;
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with Einfo; use Einfo;
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with Errout; use Errout;
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with Exp_Dist; use Exp_Dist;
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with Exp_Tss; use Exp_Tss;
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with Nlists; use Nlists;
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with Nmake; use Nmake;
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with Namet; use Namet;
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with Opt; use Opt;
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with Rtsfind; use Rtsfind;
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with Sem; use Sem;
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with Sem_Aux; use Sem_Aux;
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with Sem_Disp; use Sem_Disp;
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with Sem_Eval; use Sem_Eval;
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with Sem_Res; use Sem_Res;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Stand; use Stand;
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with Stringt; use Stringt;
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with Tbuild; use Tbuild;
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with Uintp; use Uintp;
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package body Sem_Dist is
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure RAS_E_Dereference (Pref : Node_Id);
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-- Handles explicit dereference of Remote Access to Subprograms
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function Full_Qualified_Name (E : Entity_Id) return String_Id;
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-- returns the full qualified name of the entity in lower case
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-------------------------
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-- Add_Stub_Constructs --
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-------------------------
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procedure Add_Stub_Constructs (N : Node_Id) is
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U : constant Node_Id := Unit (N);
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Spec : Entity_Id := Empty;
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Exp : Node_Id := U;
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-- Unit that will be expanded
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begin
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pragma Assert (Distribution_Stub_Mode /= No_Stubs);
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if Nkind (U) = N_Package_Declaration then
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Spec := Defining_Entity (Specification (U));
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elsif Nkind (U) = N_Package_Body then
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Spec := Corresponding_Spec (U);
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else pragma Assert (Nkind (U) = N_Package_Instantiation);
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Exp := Instance_Spec (U);
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Spec := Defining_Entity (Specification (Exp));
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end if;
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pragma Assert (Is_Shared_Passive (Spec)
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or else Is_Remote_Call_Interface (Spec));
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if Distribution_Stub_Mode = Generate_Caller_Stub_Body then
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if Is_Shared_Passive (Spec) then
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null;
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elsif Nkind (U) = N_Package_Body then
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Error_Msg_N
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("Specification file expected from command line", U);
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else
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Expand_Calling_Stubs_Bodies (Exp);
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end if;
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else
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if Is_Shared_Passive (Spec) then
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Build_Passive_Partition_Stub (Exp);
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else
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Expand_Receiving_Stubs_Bodies (Exp);
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end if;
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end if;
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end Add_Stub_Constructs;
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---------------------------------------
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-- Build_RAS_Primitive_Specification --
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---------------------------------------
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function Build_RAS_Primitive_Specification
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(Subp_Spec : Node_Id;
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Remote_Object_Type : Node_Id) return Node_Id
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is
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Loc : constant Source_Ptr := Sloc (Subp_Spec);
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Primitive_Spec : constant Node_Id :=
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Copy_Specification (Loc,
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Spec => Subp_Spec,
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New_Name => Name_uCall);
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Subtype_Mark_For_Self : Node_Id;
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begin
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if No (Parameter_Specifications (Primitive_Spec)) then
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Set_Parameter_Specifications (Primitive_Spec, New_List);
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end if;
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if Nkind (Remote_Object_Type) in N_Entity then
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Subtype_Mark_For_Self :=
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New_Occurrence_Of (Remote_Object_Type, Loc);
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else
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Subtype_Mark_For_Self := Remote_Object_Type;
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end if;
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Prepend_To (
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Parameter_Specifications (Primitive_Spec),
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Make_Parameter_Specification (Loc,
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Defining_Identifier =>
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Make_Defining_Identifier (Loc, Name_uS),
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Parameter_Type =>
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Make_Access_Definition (Loc,
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Subtype_Mark =>
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Subtype_Mark_For_Self)));
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-- Trick later semantic analysis into considering this operation as a
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-- primitive (dispatching) operation of tagged type Obj_Type.
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Set_Comes_From_Source (
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Defining_Unit_Name (Primitive_Spec), True);
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return Primitive_Spec;
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end Build_RAS_Primitive_Specification;
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-------------------------
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-- Full_Qualified_Name --
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-------------------------
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function Full_Qualified_Name (E : Entity_Id) return String_Id is
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Ent : Entity_Id := E;
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Parent_Name : String_Id := No_String;
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begin
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-- Deals properly with child units
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if Nkind (Ent) = N_Defining_Program_Unit_Name then
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Ent := Defining_Identifier (Ent);
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end if;
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-- Compute recursively the qualification (only "Standard" has no scope)
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if Present (Scope (Scope (Ent))) then
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Parent_Name := Full_Qualified_Name (Scope (Ent));
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end if;
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-- Every entity should have a name except some expanded blocks. Do not
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-- bother about those.
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if Chars (Ent) = No_Name then
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return Parent_Name;
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end if;
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-- Add a period between Name and qualification
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if Parent_Name /= No_String then
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Start_String (Parent_Name);
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Store_String_Char (Get_Char_Code ('.'));
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else
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Start_String;
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end if;
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-- Generates the entity name in upper case
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Get_Name_String (Chars (Ent));
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Set_Casing (All_Lower_Case);
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Store_String_Chars (Name_Buffer (1 .. Name_Len));
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return End_String;
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end Full_Qualified_Name;
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------------------
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-- Get_PCS_Name --
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------------------
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function Get_PCS_Name return PCS_Names is
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begin
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return
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Chars (Entity (Expression (Parent (RTE (RE_DSA_Implementation)))));
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end Get_PCS_Name;
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---------------------
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-- Get_PCS_Version --
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---------------------
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function Get_PCS_Version return Int is
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PCS_Version_Entity : Entity_Id;
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PCS_Version : Int;
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begin
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if RTE_Available (RE_PCS_Version) then
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PCS_Version_Entity := RTE (RE_PCS_Version);
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pragma Assert (Ekind (PCS_Version_Entity) = E_Named_Integer);
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PCS_Version :=
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UI_To_Int (Expr_Value (Constant_Value (PCS_Version_Entity)));
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else
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-- Case of System.Partition_Interface.PCS_Version not found:
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-- return a null version.
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PCS_Version := 0;
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end if;
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return PCS_Version;
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end Get_PCS_Version;
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------------------------
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-- Is_All_Remote_Call --
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------------------------
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function Is_All_Remote_Call (N : Node_Id) return Boolean is
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Par : Node_Id;
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begin
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if Nkind (N) in N_Subprogram_Call
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and then Nkind (Name (N)) in N_Has_Entity
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and then Is_Remote_Call_Interface (Entity (Name (N)))
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and then Has_All_Calls_Remote (Scope (Entity (Name (N))))
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and then Comes_From_Source (N)
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then
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Par := Parent (Entity (Name (N)));
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while Present (Par)
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and then (Nkind (Par) /= N_Package_Specification
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or else Is_Wrapper_Package (Defining_Entity (Par)))
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loop
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Par := Parent (Par);
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end loop;
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if Present (Par) then
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return
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not Scope_Within_Or_Same (Current_Scope, Defining_Entity (Par));
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else
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return False;
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end if;
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else
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return False;
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end if;
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end Is_All_Remote_Call;
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---------------------------------
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-- Is_RACW_Stub_Type_Operation --
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---------------------------------
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function Is_RACW_Stub_Type_Operation (Op : Entity_Id) return Boolean is
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Typ : Entity_Id;
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begin
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case Ekind (Op) is
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when E_Function
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| E_Procedure
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=>
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Typ := Find_Dispatching_Type (Op);
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return
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Present (Typ)
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and then Is_RACW_Stub_Type (Typ)
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and then not Is_Internal (Op);
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when others =>
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return False;
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end case;
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end Is_RACW_Stub_Type_Operation;
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---------------------------------
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-- Is_Valid_Remote_Object_Type --
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---------------------------------
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function Is_Valid_Remote_Object_Type (E : Entity_Id) return Boolean is
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P : constant Node_Id := Parent (E);
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begin
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pragma Assert (Is_Tagged_Type (E));
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-- Simple case: a limited private type
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if Nkind (P) = N_Private_Type_Declaration
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and then Is_Limited_Record (E)
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then
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return True;
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-- AI05-0060 (Binding Interpretation): A limited interface is a legal
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-- ancestor for the designated type of an RACW type.
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elsif Is_Limited_Record (E) and then Is_Limited_Interface (E) then
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return True;
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-- A generic tagged limited type is a valid candidate. Limitedness will
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-- be checked again on the actual at instantiation point.
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elsif Nkind (P) = N_Formal_Type_Declaration
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and then Ekind (E) = E_Record_Type_With_Private
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and then Is_Generic_Type (E)
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and then Is_Limited_Record (E)
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then
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return True;
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-- A private extension declaration is a valid candidate if its parent
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-- type is.
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elsif Nkind (P) = N_Private_Extension_Declaration then
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return Is_Valid_Remote_Object_Type (Etype (E));
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else
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return False;
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end if;
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end Is_Valid_Remote_Object_Type;
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------------------------------------
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-- Package_Specification_Of_Scope --
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------------------------------------
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function Package_Specification_Of_Scope (E : Entity_Id) return Node_Id is
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N : Node_Id;
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begin
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N := Parent (E);
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while Nkind (N) /= N_Package_Specification loop
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N := Parent (N);
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end loop;
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return N;
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end Package_Specification_Of_Scope;
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--------------------------
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-- Process_Partition_ID --
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--------------------------
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procedure Process_Partition_Id (N : Node_Id) is
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Loc : constant Source_Ptr := Sloc (N);
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Ety : Entity_Id;
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Get_Pt_Id : Node_Id;
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Get_Pt_Id_Call : Node_Id;
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Prefix_String : String_Id;
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Typ : constant Entity_Id := Etype (N);
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begin
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-- In case prefix is not a library unit entity, get the entity
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-- of library unit.
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Ety := Entity (Prefix (N));
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while (Present (Scope (Ety))
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and then Scope (Ety) /= Standard_Standard)
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and not Is_Child_Unit (Ety)
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loop
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Ety := Scope (Ety);
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end loop;
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-- Retrieve the proper function to call
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if Is_Remote_Call_Interface (Ety) then
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Get_Pt_Id := New_Occurrence_Of
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(RTE (RE_Get_Active_Partition_Id), Loc);
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elsif Is_Shared_Passive (Ety) then
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Get_Pt_Id := New_Occurrence_Of
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(RTE (RE_Get_Passive_Partition_Id), Loc);
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else
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Get_Pt_Id := New_Occurrence_Of
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(RTE (RE_Get_Local_Partition_Id), Loc);
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end if;
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-- Get and store the String_Id corresponding to the name of the
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-- library unit whose Partition_Id is needed.
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Get_Library_Unit_Name_String (Unit_Declaration_Node (Ety));
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Prefix_String := String_From_Name_Buffer;
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-- Build the function call which will replace the attribute
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if Is_Remote_Call_Interface (Ety) or else Is_Shared_Passive (Ety) then
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Get_Pt_Id_Call :=
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Make_Function_Call (Loc,
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Name => Get_Pt_Id,
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Parameter_Associations =>
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New_List (Make_String_Literal (Loc, Prefix_String)));
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else
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Get_Pt_Id_Call := Make_Function_Call (Loc, Get_Pt_Id);
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end if;
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-- Replace the attribute node by a conversion of the function call
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-- to the target type.
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Rewrite (N, Convert_To (Typ, Get_Pt_Id_Call));
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Analyze_And_Resolve (N, Typ);
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end Process_Partition_Id;
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----------------------------------
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-- Process_Remote_AST_Attribute --
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----------------------------------
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procedure Process_Remote_AST_Attribute
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(N : Node_Id;
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New_Type : Entity_Id)
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is
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Loc : constant Source_Ptr := Sloc (N);
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Remote_Subp : Entity_Id;
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Tick_Access_Conv_Call : Node_Id;
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Remote_Subp_Decl : Node_Id;
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RS_Pkg_Specif : Node_Id;
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RS_Pkg_E : Entity_Id;
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RAS_Type : Entity_Id := New_Type;
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Async_E : Entity_Id;
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All_Calls_Remote_E : Entity_Id;
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Attribute_Subp : Entity_Id;
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begin
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-- Check if we have to expand the access attribute
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Remote_Subp := Entity (Prefix (N));
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if not Expander_Active or else Get_PCS_Name = Name_No_DSA then
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return;
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end if;
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if Ekind (RAS_Type) /= E_Record_Type then
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RAS_Type := Equivalent_Type (RAS_Type);
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end if;
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Attribute_Subp := TSS (RAS_Type, TSS_RAS_Access);
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pragma Assert (Present (Attribute_Subp));
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Remote_Subp_Decl := Unit_Declaration_Node (Remote_Subp);
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if Nkind (Remote_Subp_Decl) = N_Subprogram_Body then
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Remote_Subp := Corresponding_Spec (Remote_Subp_Decl);
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Remote_Subp_Decl := Unit_Declaration_Node (Remote_Subp);
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end if;
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RS_Pkg_Specif := Parent (Remote_Subp_Decl);
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RS_Pkg_E := Defining_Entity (RS_Pkg_Specif);
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Async_E :=
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Boolean_Literals (Ekind (Remote_Subp) = E_Procedure
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and then Is_Asynchronous (Remote_Subp));
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All_Calls_Remote_E :=
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Boolean_Literals (Has_All_Calls_Remote (RS_Pkg_E));
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Tick_Access_Conv_Call :=
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Make_Function_Call (Loc,
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Name => New_Occurrence_Of (Attribute_Subp, Loc),
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Parameter_Associations =>
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New_List (
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Make_String_Literal (Loc,
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Strval => Full_Qualified_Name (RS_Pkg_E)),
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Build_Subprogram_Id (Loc, Remote_Subp),
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New_Occurrence_Of (Async_E, Loc),
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New_Occurrence_Of (All_Calls_Remote_E, Loc)));
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Rewrite (N, Tick_Access_Conv_Call);
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Analyze_And_Resolve (N, RAS_Type);
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end Process_Remote_AST_Attribute;
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------------------------------------
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-- Process_Remote_AST_Declaration --
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------------------------------------
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procedure Process_Remote_AST_Declaration (N : Node_Id) is
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Loc : constant Source_Ptr := Sloc (N);
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User_Type : constant Node_Id := Defining_Identifier (N);
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Scop : constant Entity_Id := Scope (User_Type);
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Is_RCI : constant Boolean := Is_Remote_Call_Interface (Scop);
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Is_RT : constant Boolean := Is_Remote_Types (Scop);
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Type_Def : constant Node_Id := Type_Definition (N);
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Parameter : Node_Id;
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Is_Degenerate : Boolean;
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-- True iff this RAS has an access formal parameter (see
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-- Exp_Dist.Add_RAS_Dereference_TSS for details).
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Subpkg : constant Entity_Id := Make_Temporary (Loc, 'S');
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Subpkg_Decl : Node_Id;
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Subpkg_Body : Node_Id;
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Vis_Decls : constant List_Id := New_List;
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Priv_Decls : constant List_Id := New_List;
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Obj_Type : constant Entity_Id :=
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Make_Defining_Identifier (Loc,
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New_External_Name (Chars (User_Type), 'R'));
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Full_Obj_Type : constant Entity_Id :=
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Make_Defining_Identifier (Loc, Chars (Obj_Type));
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RACW_Type : constant Entity_Id :=
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Make_Defining_Identifier (Loc,
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New_External_Name (Chars (User_Type), 'P'));
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Fat_Type : constant Entity_Id :=
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Make_Defining_Identifier (Loc, Chars (User_Type));
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Fat_Type_Decl : Node_Id;
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begin
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Is_Degenerate := False;
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Parameter := First (Parameter_Specifications (Type_Def));
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while Present (Parameter) loop
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if Nkind (Parameter_Type (Parameter)) = N_Access_Definition then
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Error_Msg_N
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("formal parameter& has anonymous access type??",
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Defining_Identifier (Parameter));
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Is_Degenerate := True;
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exit;
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end if;
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Next (Parameter);
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end loop;
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if Is_Degenerate then
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Error_Msg_NE
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("remote access-to-subprogram type& can only be null??",
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Defining_Identifier (Parameter), User_Type);
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-- The only legal value for a RAS with a formal parameter of an
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-- anonymous access type is null, because it cannot be subtype-
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-- conformant with any legal remote subprogram declaration. In this
|
|
-- case, we cannot generate a corresponding primitive operation.
|
|
|
|
end if;
|
|
|
|
if Get_PCS_Name = Name_No_DSA then
|
|
return;
|
|
end if;
|
|
|
|
-- The tagged private type, primitive operation and RACW type associated
|
|
-- with a RAS need to all be declared in a subpackage of the one that
|
|
-- contains the RAS declaration, because the primitive of the object
|
|
-- type, and the associated primitive of the stub type, need to be
|
|
-- dispatching operations of these types, and the profile of the RAS
|
|
-- might contain tagged types declared in the same scope.
|
|
|
|
Append_To (Vis_Decls,
|
|
Make_Private_Type_Declaration (Loc,
|
|
Defining_Identifier => Obj_Type,
|
|
Abstract_Present => True,
|
|
Tagged_Present => True,
|
|
Limited_Present => True));
|
|
|
|
Append_To (Priv_Decls,
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Full_Obj_Type,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Abstract_Present => True,
|
|
Tagged_Present => True,
|
|
Limited_Present => True,
|
|
Null_Present => True,
|
|
Component_List => Empty)));
|
|
|
|
-- Trick semantic analysis into swapping the public and full view when
|
|
-- freezing the public view.
|
|
|
|
Set_Comes_From_Source (Full_Obj_Type, True);
|
|
|
|
if not Is_Degenerate then
|
|
Append_To (Vis_Decls,
|
|
Make_Abstract_Subprogram_Declaration (Loc,
|
|
Specification => Build_RAS_Primitive_Specification (
|
|
Subp_Spec => Type_Def,
|
|
Remote_Object_Type => Obj_Type)));
|
|
end if;
|
|
|
|
Append_To (Vis_Decls,
|
|
Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => RACW_Type,
|
|
Type_Definition =>
|
|
Make_Access_To_Object_Definition (Loc,
|
|
All_Present => True,
|
|
Subtype_Indication =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Obj_Type, Loc),
|
|
Attribute_Name => Name_Class))));
|
|
|
|
Set_Is_Remote_Call_Interface (RACW_Type, Is_RCI);
|
|
Set_Is_Remote_Types (RACW_Type, Is_RT);
|
|
|
|
Subpkg_Decl :=
|
|
Make_Package_Declaration (Loc,
|
|
Make_Package_Specification (Loc,
|
|
Defining_Unit_Name => Subpkg,
|
|
Visible_Declarations => Vis_Decls,
|
|
Private_Declarations => Priv_Decls,
|
|
End_Label => New_Occurrence_Of (Subpkg, Loc)));
|
|
|
|
Set_Is_Remote_Call_Interface (Subpkg, Is_RCI);
|
|
Set_Is_Remote_Types (Subpkg, Is_RT);
|
|
Insert_After_And_Analyze (N, Subpkg_Decl);
|
|
|
|
-- Generate package body to receive RACW calling stubs
|
|
|
|
-- Note: Analyze_Declarations has an absolute requirement that the
|
|
-- declaration list be non-empty, so provide dummy null statement here.
|
|
|
|
Subpkg_Body :=
|
|
Make_Package_Body (Loc,
|
|
Defining_Unit_Name => Make_Defining_Identifier (Loc, Chars (Subpkg)),
|
|
Declarations => New_List (Make_Null_Statement (Loc)));
|
|
Insert_After_And_Analyze (Subpkg_Decl, Subpkg_Body);
|
|
|
|
-- Many parts of the analyzer and expander expect
|
|
-- that the fat pointer type used to implement remote
|
|
-- access to subprogram types be a record.
|
|
-- Note: The structure of this type must be kept consistent
|
|
-- with the code generated by Remote_AST_Null_Value for the
|
|
-- corresponding 'null' expression.
|
|
|
|
Fat_Type_Decl := Make_Full_Type_Declaration (Loc,
|
|
Defining_Identifier => Fat_Type,
|
|
Type_Definition =>
|
|
Make_Record_Definition (Loc,
|
|
Component_List =>
|
|
Make_Component_List (Loc,
|
|
Component_Items => New_List (
|
|
Make_Component_Declaration (Loc,
|
|
Defining_Identifier =>
|
|
Make_Defining_Identifier (Loc, Name_Ras),
|
|
Component_Definition =>
|
|
Make_Component_Definition (Loc,
|
|
Aliased_Present => False,
|
|
Subtype_Indication =>
|
|
New_Occurrence_Of (RACW_Type, Loc)))))));
|
|
|
|
Set_Equivalent_Type (User_Type, Fat_Type);
|
|
|
|
-- Set Fat_Type's Etype early so that we can use its
|
|
-- Corresponding_Remote_Type attribute, whose presence indicates that
|
|
-- this is the record type used to implement a RAS.
|
|
|
|
Set_Ekind (Fat_Type, E_Record_Type);
|
|
Set_Corresponding_Remote_Type (Fat_Type, User_Type);
|
|
|
|
Insert_After_And_Analyze (Subpkg_Body, Fat_Type_Decl);
|
|
|
|
-- The reason we suppress the initialization procedure is that we know
|
|
-- that no initialization is required (even if Initialize_Scalars mode
|
|
-- is active), and there are order of elaboration problems if we do try
|
|
-- to generate an init proc for this created record type.
|
|
|
|
Set_Suppress_Initialization (Fat_Type);
|
|
|
|
if Expander_Active then
|
|
Add_RAST_Features (Parent (User_Type));
|
|
end if;
|
|
end Process_Remote_AST_Declaration;
|
|
|
|
-----------------------
|
|
-- RAS_E_Dereference --
|
|
-----------------------
|
|
|
|
procedure RAS_E_Dereference (Pref : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (Pref);
|
|
Call_Node : Node_Id;
|
|
New_Type : constant Entity_Id := Etype (Pref);
|
|
Explicit_Deref : constant Node_Id := Parent (Pref);
|
|
Deref_Subp_Call : constant Node_Id := Parent (Explicit_Deref);
|
|
Deref_Proc : Entity_Id;
|
|
Params : List_Id;
|
|
|
|
begin
|
|
if Nkind (Deref_Subp_Call) = N_Procedure_Call_Statement then
|
|
Params := Parameter_Associations (Deref_Subp_Call);
|
|
|
|
if Present (Params) then
|
|
Prepend (Pref, Params);
|
|
else
|
|
Params := New_List (Pref);
|
|
end if;
|
|
|
|
elsif Nkind (Deref_Subp_Call) = N_Indexed_Component then
|
|
Params := Expressions (Deref_Subp_Call);
|
|
|
|
if Present (Params) then
|
|
Prepend (Pref, Params);
|
|
else
|
|
Params := New_List (Pref);
|
|
end if;
|
|
|
|
else
|
|
-- Context is not a call
|
|
|
|
return;
|
|
end if;
|
|
|
|
if not Expander_Active or else Get_PCS_Name = Name_No_DSA then
|
|
return;
|
|
end if;
|
|
|
|
Deref_Proc := TSS (New_Type, TSS_RAS_Dereference);
|
|
pragma Assert (Present (Deref_Proc));
|
|
|
|
if Ekind (Deref_Proc) = E_Function then
|
|
Call_Node :=
|
|
Make_Function_Call (Loc,
|
|
Name => New_Occurrence_Of (Deref_Proc, Loc),
|
|
Parameter_Associations => Params);
|
|
else
|
|
Call_Node :=
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Occurrence_Of (Deref_Proc, Loc),
|
|
Parameter_Associations => Params);
|
|
end if;
|
|
|
|
Rewrite (Deref_Subp_Call, Call_Node);
|
|
Analyze (Deref_Subp_Call);
|
|
end RAS_E_Dereference;
|
|
|
|
------------------------------
|
|
-- Remote_AST_E_Dereference --
|
|
------------------------------
|
|
|
|
function Remote_AST_E_Dereference (P : Node_Id) return Boolean is
|
|
ET : constant Entity_Id := Etype (P);
|
|
|
|
begin
|
|
-- Perform the changes only on original dereferences, and only if
|
|
-- we are generating code.
|
|
|
|
if Comes_From_Source (P)
|
|
and then Is_Record_Type (ET)
|
|
and then (Is_Remote_Call_Interface (ET)
|
|
or else Is_Remote_Types (ET))
|
|
and then Present (Corresponding_Remote_Type (ET))
|
|
and then Nkind_In (Parent (Parent (P)), N_Procedure_Call_Statement,
|
|
N_Indexed_Component)
|
|
and then Expander_Active
|
|
then
|
|
RAS_E_Dereference (P);
|
|
return True;
|
|
else
|
|
return False;
|
|
end if;
|
|
end Remote_AST_E_Dereference;
|
|
|
|
------------------------------
|
|
-- Remote_AST_I_Dereference --
|
|
------------------------------
|
|
|
|
function Remote_AST_I_Dereference (P : Node_Id) return Boolean is
|
|
ET : constant Entity_Id := Etype (P);
|
|
Deref : Node_Id;
|
|
|
|
begin
|
|
if Comes_From_Source (P)
|
|
and then (Is_Remote_Call_Interface (ET)
|
|
or else Is_Remote_Types (ET))
|
|
and then Present (Corresponding_Remote_Type (ET))
|
|
and then Ekind (Entity (P)) /= E_Function
|
|
then
|
|
Deref :=
|
|
Make_Explicit_Dereference (Sloc (P),
|
|
Prefix => Relocate_Node (P));
|
|
Rewrite (P, Deref);
|
|
Set_Etype (P, ET);
|
|
RAS_E_Dereference (Prefix (P));
|
|
return True;
|
|
end if;
|
|
|
|
return False;
|
|
end Remote_AST_I_Dereference;
|
|
|
|
---------------------------
|
|
-- Remote_AST_Null_Value --
|
|
---------------------------
|
|
|
|
function Remote_AST_Null_Value
|
|
(N : Node_Id;
|
|
Typ : Entity_Id) return Boolean
|
|
is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Target_Type : Entity_Id;
|
|
|
|
begin
|
|
if not Expander_Active or else Get_PCS_Name = Name_No_DSA then
|
|
return False;
|
|
|
|
elsif Ekind (Typ) = E_Access_Subprogram_Type
|
|
and then (Is_Remote_Call_Interface (Typ)
|
|
or else Is_Remote_Types (Typ))
|
|
and then Comes_From_Source (N)
|
|
and then Expander_Active
|
|
then
|
|
-- Any null that comes from source and is of the RAS type must
|
|
-- be expanded, except if expansion is not active (nothing
|
|
-- gets expanded into the equivalent record type).
|
|
|
|
Target_Type := Equivalent_Type (Typ);
|
|
|
|
elsif Ekind (Typ) = E_Record_Type
|
|
and then Present (Corresponding_Remote_Type (Typ))
|
|
then
|
|
-- This is a record type representing a RAS type, this must be
|
|
-- expanded.
|
|
|
|
Target_Type := Typ;
|
|
|
|
else
|
|
-- We do not have to handle this case
|
|
|
|
return False;
|
|
end if;
|
|
|
|
Rewrite (N,
|
|
Make_Aggregate (Loc,
|
|
Component_Associations => New_List (
|
|
Make_Component_Association (Loc,
|
|
Choices => New_List (Make_Identifier (Loc, Name_Ras)),
|
|
Expression => Make_Null (Loc)))));
|
|
Analyze_And_Resolve (N, Target_Type);
|
|
return True;
|
|
end Remote_AST_Null_Value;
|
|
|
|
end Sem_Dist;
|