757 lines
28 KiB
Ada
757 lines
28 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ C H 1 3 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Atree; use Atree;
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with Checks; use Checks;
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with Einfo; use Einfo;
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with Exp_Ch3; use Exp_Ch3;
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with Exp_Ch6; use Exp_Ch6;
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with Exp_Imgv; use Exp_Imgv;
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with Exp_Tss; use Exp_Tss;
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with Exp_Util; use Exp_Util;
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with Freeze; use Freeze;
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with Ghost; use Ghost;
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with Namet; use Namet;
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with Nlists; use Nlists;
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with Nmake; use Nmake;
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with Opt; use Opt;
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with Restrict; use Restrict;
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with Rident; use Rident;
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with Rtsfind; use Rtsfind;
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with Sem; use Sem;
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with Sem_Aux; use Sem_Aux;
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with Sem_Ch7; use Sem_Ch7;
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with Sem_Ch8; use Sem_Ch8;
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with Sem_Eval; use Sem_Eval;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Snames; use Snames;
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with Tbuild; use Tbuild;
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with Uintp; use Uintp;
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with Validsw; use Validsw;
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package body Exp_Ch13 is
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------------------------------------------
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-- Expand_N_Attribute_Definition_Clause --
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------------------------------------------
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-- Expansion action depends on attribute involved
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procedure Expand_N_Attribute_Definition_Clause (N : Node_Id) is
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Loc : constant Source_Ptr := Sloc (N);
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Exp : constant Node_Id := Expression (N);
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Ent : Entity_Id;
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V : Node_Id;
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begin
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Ent := Entity (Name (N));
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if Is_Type (Ent) then
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Ent := Underlying_Type (Ent);
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end if;
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case Get_Attribute_Id (Chars (N)) is
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-------------
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-- Address --
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-------------
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when Attribute_Address =>
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-- If there is an initialization which did not come from the
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-- source program, then it is an artifact of our expansion, and we
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-- suppress it. The case we are most concerned about here is the
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-- initialization of a packed array to all false, which seems
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-- inappropriate for variable to which an address clause is
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-- applied. The expression may itself have been rewritten if the
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-- type is packed array, so we need to examine whether the
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-- original node is in the source. An exception though is the case
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-- of an access variable which is default initialized to null, and
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-- such initialization is retained.
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-- Furthermore, if the initialization is the equivalent aggregate
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-- of the type initialization procedure, it replaces an implicit
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-- call to the init proc, and must be respected. Note that for
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-- packed types we do not build equivalent aggregates.
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-- Also, if Init_Or_Norm_Scalars applies, then we need to retain
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-- any default initialization for objects of scalar types and
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-- types with scalar components. Normally a composite type will
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-- have an init_proc in the presence of Init_Or_Norm_Scalars,
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-- so when that flag is set we have just have to do a test for
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-- scalar and string types (the predefined string types such as
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-- String and Wide_String don't have an init_proc).
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declare
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Decl : constant Node_Id := Declaration_Node (Ent);
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Typ : constant Entity_Id := Etype (Ent);
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begin
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if Nkind (Decl) = N_Object_Declaration
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and then Present (Expression (Decl))
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and then Nkind (Expression (Decl)) /= N_Null
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and then
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not Comes_From_Source (Original_Node (Expression (Decl)))
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then
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if Present (Base_Init_Proc (Typ))
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and then
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Present (Static_Initialization (Base_Init_Proc (Typ)))
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then
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null;
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elsif Init_Or_Norm_Scalars
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and then
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(Is_Scalar_Type (Typ) or else Is_String_Type (Typ))
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then
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null;
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else
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Set_Expression (Decl, Empty);
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end if;
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-- An object declaration to which an address clause applies
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-- has a delayed freeze, but the address expression itself
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-- must be elaborated at the point it appears. If the object
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-- is controlled, additional checks apply elsewhere.
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-- If the attribute comes from an aspect specification it
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-- is being elaborated at the freeze point and side effects
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-- need not be removed (and shouldn't, if the expression
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-- depends on other entities that have delayed freeze).
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-- This is another consequence of the delayed analysis of
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-- aspects, and a real semantic difference.
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elsif Nkind (Decl) = N_Object_Declaration
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and then not Needs_Constant_Address (Decl, Typ)
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and then not From_Aspect_Specification (N)
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then
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Remove_Side_Effects (Exp);
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end if;
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end;
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---------------
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-- Alignment --
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---------------
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when Attribute_Alignment =>
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-- As required by Gigi, we guarantee that the operand is an
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-- integer literal (this simplifies things in Gigi).
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if Nkind (Exp) /= N_Integer_Literal then
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Rewrite
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(Exp, Make_Integer_Literal (Loc, Expr_Value (Exp)));
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end if;
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-- A complex case arises if the alignment clause applies to an
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-- unconstrained object initialized with a function call. The
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-- result of the call is placed on the secondary stack, and the
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-- declaration is rewritten as a renaming of a dereference, which
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-- fails expansion. We must introduce a temporary and assign its
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-- value to the existing entity.
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if Nkind (Parent (Ent)) = N_Object_Renaming_Declaration
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and then not Is_Entity_Name (Renamed_Object (Ent))
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then
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declare
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Loc : constant Source_Ptr := Sloc (N);
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Decl : constant Node_Id := Parent (Ent);
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Temp : constant Entity_Id := Make_Temporary (Loc, 'T');
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New_Decl : Node_Id;
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begin
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-- Replace entity with temporary and reanalyze
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Set_Defining_Identifier (Decl, Temp);
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Set_Analyzed (Decl, False);
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Analyze (Decl);
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-- Introduce new declaration for entity but do not reanalyze
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-- because entity is already in scope. Type and expression
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-- are already resolved.
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New_Decl :=
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Make_Object_Declaration (Loc,
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Defining_Identifier => Ent,
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Object_Definition =>
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New_Occurrence_Of (Etype (Ent), Loc),
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Expression => New_Occurrence_Of (Temp, Loc));
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Set_Renamed_Object (Ent, Empty);
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Insert_After (Decl, New_Decl);
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Set_Analyzed (Decl);
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end;
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end if;
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------------------
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-- Storage_Size --
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------------------
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when Attribute_Storage_Size =>
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-- If the type is a task type, then assign the value of the
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-- storage size to the Size variable associated with the task.
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-- Insert the assignment right after the declaration of the Size
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-- variable.
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-- Generate:
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-- task_typeZ := expression
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if Ekind (Ent) = E_Task_Type then
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declare
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Assign : Node_Id;
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begin
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Assign :=
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Make_Assignment_Statement (Loc,
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Name =>
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New_Occurrence_Of (Storage_Size_Variable (Ent), Loc),
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Expression =>
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Convert_To (RTE (RE_Size_Type), Expression (N)));
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-- If the clause is not generated by an aspect, insert
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-- the assignment here. Freezing rules ensure that this
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-- is safe, or clause will have been rejected already.
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if Is_List_Member (N) then
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Insert_After (N, Assign);
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-- Otherwise, insert assignment after task declaration.
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else
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Insert_After
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(Parent (Storage_Size_Variable (Entity (N))), Assign);
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end if;
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Analyze (Assign);
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end;
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-- For Storage_Size for an access type, create a variable to hold
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-- the value of the specified size with name typeV and expand an
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-- assignment statement to initialize this value.
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elsif Is_Access_Type (Ent) then
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-- We don't need the variable for a storage size of zero
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if not No_Pool_Assigned (Ent) then
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V :=
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Make_Defining_Identifier (Loc,
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Chars => New_External_Name (Chars (Ent), 'V'));
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-- Insert the declaration of the object
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Insert_Action (N,
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Make_Object_Declaration (Loc,
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Defining_Identifier => V,
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Object_Definition =>
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New_Occurrence_Of (RTE (RE_Storage_Offset), Loc),
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Expression =>
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Convert_To (RTE (RE_Storage_Offset), Expression (N))));
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Set_Storage_Size_Variable (Ent, Entity_Id (V));
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end if;
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end if;
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-- Other attributes require no expansion
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when others =>
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null;
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end case;
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end Expand_N_Attribute_Definition_Clause;
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-----------------------------
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-- Expand_N_Free_Statement --
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-----------------------------
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procedure Expand_N_Free_Statement (N : Node_Id) is
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Expr : constant Node_Id := Expression (N);
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Typ : Entity_Id;
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begin
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-- Certain run-time configurations and targets do not provide support
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-- for controlled types.
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if Restriction_Active (No_Finalization) then
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return;
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end if;
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-- Use the base type to perform the check for finalization master
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Typ := Etype (Expr);
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if Ekind (Typ) = E_Access_Subtype then
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Typ := Etype (Typ);
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end if;
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-- Handle private access types
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if Is_Private_Type (Typ)
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and then Present (Full_View (Typ))
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then
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Typ := Full_View (Typ);
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end if;
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-- Do not create a custom Deallocate when freeing an object with
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-- suppressed finalization. In such cases the object is never attached
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-- to a master, so it does not need to be detached. Use a regular free
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-- statement instead.
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if No (Finalization_Master (Typ)) then
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return;
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end if;
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-- Use a temporary to store the result of a complex expression. Perform
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-- the following transformation:
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--
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-- Free (Complex_Expression);
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--
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-- Temp : constant Type_Of_Expression := Complex_Expression;
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-- Free (Temp);
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if Nkind (Expr) /= N_Identifier then
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declare
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Expr_Typ : constant Entity_Id := Etype (Expr);
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Loc : constant Source_Ptr := Sloc (N);
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New_Expr : Node_Id;
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Temp_Id : Entity_Id;
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begin
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Temp_Id := Make_Temporary (Loc, 'T');
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Insert_Action (N,
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Make_Object_Declaration (Loc,
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Defining_Identifier => Temp_Id,
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Object_Definition =>
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New_Occurrence_Of (Expr_Typ, Loc),
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Expression =>
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Relocate_Node (Expr)));
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New_Expr := New_Occurrence_Of (Temp_Id, Loc);
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Set_Etype (New_Expr, Expr_Typ);
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Set_Expression (N, New_Expr);
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end;
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end if;
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-- Create a custom Deallocate for a controlled object. This routine
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-- ensures that the hidden list header will be deallocated along with
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-- the actual object.
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Build_Allocate_Deallocate_Proc (N, Is_Allocate => False);
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end Expand_N_Free_Statement;
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----------------------------
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-- Expand_N_Freeze_Entity --
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----------------------------
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procedure Expand_N_Freeze_Entity (N : Node_Id) is
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E : constant Entity_Id := Entity (N);
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Save_Ghost_Mode : constant Ghost_Mode_Type := Ghost_Mode;
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Decl : Node_Id;
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Delete : Boolean := False;
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E_Scope : Entity_Id;
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In_Other_Scope : Boolean;
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In_Outer_Scope : Boolean;
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begin
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-- Ensure that all freezing activities are properly flagged as Ghost
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Set_Ghost_Mode_From_Entity (E);
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-- If there are delayed aspect specifications, we insert them just
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-- before the freeze node. They are already analyzed so we don't need
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-- to reanalyze them (they were analyzed before the type was frozen),
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-- but we want them in the tree for the back end, and so that the
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-- listing from sprint is clearer on where these occur logically.
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if Has_Delayed_Aspects (E) then
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declare
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Aitem : Node_Id;
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Ritem : Node_Id;
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begin
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-- Look for aspect specs for this entity
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Ritem := First_Rep_Item (E);
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while Present (Ritem) loop
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if Nkind (Ritem) = N_Aspect_Specification
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and then Entity (Ritem) = E
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then
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Aitem := Aspect_Rep_Item (Ritem);
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-- Skip this for aspects (e.g. Current_Value) for which
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-- there is no corresponding pragma or attribute.
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if Present (Aitem)
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-- Also skip if we have a null statement rather than a
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-- delayed aspect (this happens when we are ignoring rep
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-- items from use of the -gnatI switch).
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and then Nkind (Aitem) /= N_Null_Statement
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then
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pragma Assert (Is_Delayed_Aspect (Aitem));
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Insert_Before (N, Aitem);
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end if;
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end if;
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Next_Rep_Item (Ritem);
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end loop;
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end;
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end if;
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-- Processing for objects
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if Is_Object (E) then
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if Present (Address_Clause (E)) then
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Apply_Address_Clause_Check (E, N);
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end if;
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-- Analyze actions in freeze node, if any
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if Present (Actions (N)) then
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declare
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Act : Node_Id;
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begin
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Act := First (Actions (N));
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while Present (Act) loop
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Analyze (Act);
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Next (Act);
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end loop;
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end;
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end if;
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-- If initialization statements have been captured in a compound
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-- statement, insert them back into the tree now.
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Explode_Initialization_Compound_Statement (E);
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Ghost_Mode := Save_Ghost_Mode;
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return;
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-- Only other items requiring any front end action are types and
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-- subprograms.
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elsif not Is_Type (E) and then not Is_Subprogram (E) then
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Ghost_Mode := Save_Ghost_Mode;
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return;
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end if;
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-- Here E is a type or a subprogram
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E_Scope := Scope (E);
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-- This is an error protection against previous errors
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if No (E_Scope) then
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Check_Error_Detected;
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Ghost_Mode := Save_Ghost_Mode;
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return;
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end if;
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-- The entity may be a subtype declared for a constrained record
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-- component, in which case the relevant scope is the scope of
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-- the record. This happens for class-wide subtypes created for
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-- a constrained type extension with inherited discriminants.
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if Is_Type (E_Scope)
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and then Ekind (E_Scope) not in Concurrent_Kind
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then
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E_Scope := Scope (E_Scope);
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end if;
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-- Remember that we are processing a freezing entity and its freezing
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-- nodes. This flag (non-zero = set) is used to avoid the need of
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-- climbing through the tree while processing the freezing actions (ie.
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-- to avoid generating spurious warnings or to avoid killing constant
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-- indications while processing the code associated with freezing
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-- actions). We use a counter to deal with nesting.
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Inside_Freezing_Actions := Inside_Freezing_Actions + 1;
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-- If we are freezing entities defined in protected types, they belong
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-- in the enclosing scope, given that the original type has been
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-- expanded away. The same is true for entities in task types, in
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-- particular the parameter records of entries (Entities in bodies are
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-- all frozen within the body). If we are in the task body, this is a
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-- proper scope. If we are within a subprogram body, the proper scope
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-- is the corresponding spec. This may happen for itypes generated in
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-- the bodies of protected operations.
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if Ekind (E_Scope) = E_Protected_Type
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or else (Ekind (E_Scope) = E_Task_Type
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and then not Has_Completion (E_Scope))
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then
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E_Scope := Scope (E_Scope);
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elsif Ekind (E_Scope) = E_Subprogram_Body then
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E_Scope := Corresponding_Spec (Unit_Declaration_Node (E_Scope));
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end if;
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-- If the scope of the entity is in open scopes, it is the current one
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-- or an enclosing one, including a loop, a block, or a subprogram.
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if In_Open_Scopes (E_Scope) then
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In_Other_Scope := False;
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In_Outer_Scope := E_Scope /= Current_Scope;
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-- Otherwise it is a local package or a different compilation unit
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else
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In_Other_Scope := True;
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In_Outer_Scope := False;
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end if;
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-- If the entity being frozen is defined in a scope that is not
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-- currently on the scope stack, we must establish the proper
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-- visibility before freezing the entity and related subprograms.
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if In_Other_Scope then
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Push_Scope (E_Scope);
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-- Finalizers are little odd in terms of freezing. The spec of the
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-- procedure appears in the declarations while the body appears in
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-- the statement part of a single construct. Since the finalizer must
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-- be called by the At_End handler of the construct, the spec is
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-- manually frozen right after its declaration. The only side effect
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-- of this action appears in contexts where the construct is not in
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-- its final resting place. These contexts are:
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-- * Entry bodies - The declarations and statements are moved to
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-- the procedure equivalen of the entry.
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-- * Protected subprograms - The declarations and statements are
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-- moved to the non-protected version of the subprogram.
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-- * Task bodies - The declarations and statements are moved to the
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-- task body procedure.
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-- Visible declarations do not need to be installed in these three
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-- cases since it does not make semantic sense to do so. All entities
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-- referenced by a finalizer are visible and already resolved, plus
|
|
-- the enclosing scope may not have visible declarations at all.
|
|
|
|
if Ekind (E) = E_Procedure
|
|
and then Is_Finalizer (E)
|
|
and then
|
|
(Is_Entry (E_Scope)
|
|
or else (Is_Subprogram (E_Scope)
|
|
and then Is_Protected_Type (Scope (E_Scope)))
|
|
or else Is_Task_Type (E_Scope))
|
|
then
|
|
null;
|
|
else
|
|
Install_Visible_Declarations (E_Scope);
|
|
end if;
|
|
|
|
if Is_Package_Or_Generic_Package (E_Scope) or else
|
|
Is_Protected_Type (E_Scope) or else
|
|
Is_Task_Type (E_Scope)
|
|
then
|
|
Install_Private_Declarations (E_Scope);
|
|
end if;
|
|
|
|
-- If the entity is in an outer scope, then that scope needs to
|
|
-- temporarily become the current scope so that operations created
|
|
-- during type freezing will be declared in the right scope and
|
|
-- can properly override any corresponding inherited operations.
|
|
|
|
elsif In_Outer_Scope then
|
|
Push_Scope (E_Scope);
|
|
end if;
|
|
|
|
-- If type, freeze the type
|
|
|
|
if Is_Type (E) then
|
|
Delete := Freeze_Type (N);
|
|
|
|
-- And for enumeration type, build the enumeration tables
|
|
|
|
if Is_Enumeration_Type (E) then
|
|
Build_Enumeration_Image_Tables (E, N);
|
|
end if;
|
|
|
|
-- If subprogram, freeze the subprogram
|
|
|
|
elsif Is_Subprogram (E) then
|
|
Exp_Ch6.Freeze_Subprogram (N);
|
|
|
|
-- Ada 2005 (AI-251): Remove the freezing node associated with the
|
|
-- entities internally used by the frontend to register primitives
|
|
-- covering abstract interfaces. The call to Freeze_Subprogram has
|
|
-- already expanded the code that fills the corresponding entry in
|
|
-- its secondary dispatch table and therefore the code generator
|
|
-- has nothing else to do with this freezing node.
|
|
|
|
Delete := Present (Interface_Alias (E));
|
|
end if;
|
|
|
|
-- Analyze actions generated by freezing. The init_proc contains source
|
|
-- expressions that may raise Constraint_Error, and the assignment
|
|
-- procedure for complex types needs checks on individual component
|
|
-- assignments, but all other freezing actions should be compiled with
|
|
-- all checks off.
|
|
|
|
if Present (Actions (N)) then
|
|
Decl := First (Actions (N));
|
|
while Present (Decl) loop
|
|
if Nkind (Decl) = N_Subprogram_Body
|
|
and then (Is_Init_Proc (Defining_Entity (Decl))
|
|
or else
|
|
Chars (Defining_Entity (Decl)) = Name_uAssign)
|
|
then
|
|
Analyze (Decl);
|
|
|
|
-- A subprogram body created for a renaming_as_body completes
|
|
-- a previous declaration, which may be in a different scope.
|
|
-- Establish the proper scope before analysis.
|
|
|
|
elsif Nkind (Decl) = N_Subprogram_Body
|
|
and then Present (Corresponding_Spec (Decl))
|
|
and then Scope (Corresponding_Spec (Decl)) /= Current_Scope
|
|
then
|
|
Push_Scope (Scope (Corresponding_Spec (Decl)));
|
|
Analyze (Decl, Suppress => All_Checks);
|
|
Pop_Scope;
|
|
|
|
-- We treat generated equality specially, if validity checks are
|
|
-- enabled, in order to detect components default-initialized
|
|
-- with invalid values.
|
|
|
|
elsif Nkind (Decl) = N_Subprogram_Body
|
|
and then Chars (Defining_Entity (Decl)) = Name_Op_Eq
|
|
and then Validity_Checks_On
|
|
and then Initialize_Scalars
|
|
then
|
|
declare
|
|
Save_Force : constant Boolean := Force_Validity_Checks;
|
|
begin
|
|
Force_Validity_Checks := True;
|
|
Analyze (Decl);
|
|
Force_Validity_Checks := Save_Force;
|
|
end;
|
|
|
|
-- All other freezing actions
|
|
|
|
else
|
|
Analyze (Decl, Suppress => All_Checks);
|
|
end if;
|
|
|
|
Next (Decl);
|
|
end loop;
|
|
end if;
|
|
|
|
-- If we are to delete this N_Freeze_Entity, do so by rewriting so that
|
|
-- a loop on all nodes being inserted will work propertly.
|
|
|
|
if Delete then
|
|
Rewrite (N, Make_Null_Statement (Sloc (N)));
|
|
end if;
|
|
|
|
-- Pop scope if we installed one for the analysis
|
|
|
|
if In_Other_Scope then
|
|
if Ekind (Current_Scope) = E_Package then
|
|
End_Package_Scope (E_Scope);
|
|
else
|
|
End_Scope;
|
|
end if;
|
|
|
|
elsif In_Outer_Scope then
|
|
Pop_Scope;
|
|
end if;
|
|
|
|
-- Restore previous value of the nesting-level counter that records
|
|
-- whether we are inside a (possibly nested) call to this procedure.
|
|
|
|
Inside_Freezing_Actions := Inside_Freezing_Actions - 1;
|
|
Ghost_Mode := Save_Ghost_Mode;
|
|
end Expand_N_Freeze_Entity;
|
|
|
|
-------------------------------------------
|
|
-- Expand_N_Record_Representation_Clause --
|
|
-------------------------------------------
|
|
|
|
-- The only expansion required is for the case of a mod clause present,
|
|
-- which is removed, and translated into an alignment representation
|
|
-- clause inserted immediately after the record rep clause with any
|
|
-- initial pragmas inserted at the start of the component clause list.
|
|
|
|
procedure Expand_N_Record_Representation_Clause (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Rectype : constant Entity_Id := Entity (Identifier (N));
|
|
Mod_Val : Uint;
|
|
Citems : List_Id;
|
|
Repitem : Node_Id;
|
|
AtM_Nod : Node_Id;
|
|
|
|
begin
|
|
if Present (Mod_Clause (N)) and then not Ignore_Rep_Clauses then
|
|
Mod_Val := Expr_Value (Expression (Mod_Clause (N)));
|
|
Citems := Pragmas_Before (Mod_Clause (N));
|
|
|
|
if Present (Citems) then
|
|
Append_List_To (Citems, Component_Clauses (N));
|
|
Set_Component_Clauses (N, Citems);
|
|
end if;
|
|
|
|
AtM_Nod :=
|
|
Make_Attribute_Definition_Clause (Loc,
|
|
Name => New_Occurrence_Of (Base_Type (Rectype), Loc),
|
|
Chars => Name_Alignment,
|
|
Expression => Make_Integer_Literal (Loc, Mod_Val));
|
|
|
|
Set_From_At_Mod (AtM_Nod);
|
|
Insert_After (N, AtM_Nod);
|
|
Set_Mod_Clause (N, Empty);
|
|
end if;
|
|
|
|
-- If the record representation clause has no components, then
|
|
-- completely remove it. Note that we also have to remove
|
|
-- ourself from the Rep Item list.
|
|
|
|
if Is_Empty_List (Component_Clauses (N)) then
|
|
if First_Rep_Item (Rectype) = N then
|
|
Set_First_Rep_Item (Rectype, Next_Rep_Item (N));
|
|
else
|
|
Repitem := First_Rep_Item (Rectype);
|
|
while Present (Next_Rep_Item (Repitem)) loop
|
|
if Next_Rep_Item (Repitem) = N then
|
|
Set_Next_Rep_Item (Repitem, Next_Rep_Item (N));
|
|
exit;
|
|
end if;
|
|
|
|
Next_Rep_Item (Repitem);
|
|
end loop;
|
|
end if;
|
|
|
|
Rewrite (N,
|
|
Make_Null_Statement (Loc));
|
|
end if;
|
|
end Expand_N_Record_Representation_Clause;
|
|
|
|
end Exp_Ch13;
|