938 lines
34 KiB
Ada
938 lines
34 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ A T A G --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2006-2014, 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 Einfo; use Einfo;
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with Elists; use Elists;
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with Exp_Disp; use Exp_Disp;
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with Exp_Util; use Exp_Util;
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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 Rtsfind; use Rtsfind;
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with Sinfo; use Sinfo;
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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_Util; use Sem_Util;
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with Stand; use Stand;
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with Snames; use Snames;
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with Tbuild; use Tbuild;
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package body Exp_Atag is
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-----------------------
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-- Local Subprograms --
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-----------------------
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function Build_DT
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id;
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-- Build code that displaces the Tag to reference the base of the wrapper
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-- record
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--
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-- Generates:
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-- To_Dispatch_Table_Ptr
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-- (To_Address (Tag_Node) - Tag_Node.Prims_Ptr'Position);
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function Build_TSD
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(Loc : Source_Ptr;
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Tag_Node_Addr : Node_Id) return Node_Id;
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-- Build code that retrieves the address of the record containing the Type
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-- Specific Data generated by GNAT.
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--
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-- Generate: To_Type_Specific_Data_Ptr
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-- (To_Addr_Ptr (Tag_Node_Addr - Typeinfo_Offset).all);
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------------------------------------------------
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-- Build_Common_Dispatching_Select_Statements --
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------------------------------------------------
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procedure Build_Common_Dispatching_Select_Statements
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(Typ : Entity_Id;
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Stmts : List_Id)
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is
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Loc : constant Source_Ptr := Sloc (Typ);
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Tag_Node : Node_Id;
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begin
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-- Generate:
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-- C := get_prim_op_kind (tag! (<type>VP), S);
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-- where C is the out parameter capturing the call kind and S is the
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-- dispatch table slot number.
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if Tagged_Type_Expansion then
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Tag_Node :=
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Unchecked_Convert_To (RTE (RE_Tag),
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New_Occurrence_Of
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(Node (First_Elmt (Access_Disp_Table (Typ))), Loc));
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else
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Tag_Node :=
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Make_Attribute_Reference (Loc,
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Prefix => New_Occurrence_Of (Typ, Loc),
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Attribute_Name => Name_Tag);
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end if;
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Append_To (Stmts,
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Make_Assignment_Statement (Loc,
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Name => Make_Identifier (Loc, Name_uC),
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Expression =>
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Make_Function_Call (Loc,
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Name =>
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New_Occurrence_Of (RTE (RE_Get_Prim_Op_Kind), Loc),
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Parameter_Associations => New_List (
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Tag_Node,
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Make_Identifier (Loc, Name_uS)))));
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-- Generate:
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-- if C = POK_Procedure
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-- or else C = POK_Protected_Procedure
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-- or else C = POK_Task_Procedure;
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-- then
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-- F := True;
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-- return;
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-- where F is the out parameter capturing the status of a potential
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-- entry call.
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Append_To (Stmts,
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Make_If_Statement (Loc,
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Condition =>
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Make_Or_Else (Loc,
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Left_Opnd =>
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Make_Op_Eq (Loc,
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Left_Opnd => Make_Identifier (Loc, Name_uC),
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Right_Opnd =>
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New_Occurrence_Of (RTE (RE_POK_Procedure), Loc)),
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Right_Opnd =>
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Make_Or_Else (Loc,
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Left_Opnd =>
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Make_Op_Eq (Loc,
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Left_Opnd => Make_Identifier (Loc, Name_uC),
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Right_Opnd =>
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New_Occurrence_Of
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(RTE (RE_POK_Protected_Procedure), Loc)),
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Right_Opnd =>
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Make_Op_Eq (Loc,
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Left_Opnd => Make_Identifier (Loc, Name_uC),
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Right_Opnd =>
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New_Occurrence_Of
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(RTE (RE_POK_Task_Procedure), Loc)))),
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Then_Statements =>
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New_List (
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Make_Assignment_Statement (Loc,
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Name => Make_Identifier (Loc, Name_uF),
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Expression => New_Occurrence_Of (Standard_True, Loc)),
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Make_Simple_Return_Statement (Loc))));
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end Build_Common_Dispatching_Select_Statements;
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-------------------------
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-- Build_CW_Membership --
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-------------------------
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procedure Build_CW_Membership
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(Loc : Source_Ptr;
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Obj_Tag_Node : in out Node_Id;
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Typ_Tag_Node : Node_Id;
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Related_Nod : Node_Id;
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New_Node : out Node_Id)
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is
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Tag_Addr : constant Entity_Id := Make_Temporary (Loc, 'D', Obj_Tag_Node);
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Obj_TSD : constant Entity_Id := Make_Temporary (Loc, 'D');
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Typ_TSD : constant Entity_Id := Make_Temporary (Loc, 'D');
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Index : constant Entity_Id := Make_Temporary (Loc, 'D');
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begin
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-- Generate:
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-- Tag_Addr : constant Tag := Address!(Obj_Tag);
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-- Obj_TSD : constant Type_Specific_Data_Ptr
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-- := Build_TSD (Tag_Addr);
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-- Typ_TSD : constant Type_Specific_Data_Ptr
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-- := Build_TSD (Address!(Typ_Tag));
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-- Index : constant Integer := Obj_TSD.Idepth - Typ_TSD.Idepth
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-- Index > 0 and then Obj_TSD.Tags_Table (Index) = Typ'Tag
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Insert_Action (Related_Nod,
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Make_Object_Declaration (Loc,
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Defining_Identifier => Tag_Addr,
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Constant_Present => True,
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Object_Definition => New_Occurrence_Of (RTE (RE_Address), Loc),
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Expression => Unchecked_Convert_To
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(RTE (RE_Address), Obj_Tag_Node)));
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-- Unchecked_Convert_To relocates Obj_Tag_Node and therefore we must
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-- update it.
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Obj_Tag_Node := Expression (Expression (Parent (Tag_Addr)));
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Insert_Action (Related_Nod,
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Make_Object_Declaration (Loc,
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Defining_Identifier => Obj_TSD,
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Constant_Present => True,
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Object_Definition => New_Occurrence_Of
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(RTE (RE_Type_Specific_Data_Ptr), Loc),
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Expression => Build_TSD (Loc, New_Occurrence_Of (Tag_Addr, Loc))));
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Insert_Action (Related_Nod,
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Make_Object_Declaration (Loc,
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Defining_Identifier => Typ_TSD,
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Constant_Present => True,
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Object_Definition => New_Occurrence_Of
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(RTE (RE_Type_Specific_Data_Ptr), Loc),
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Expression => Build_TSD (Loc,
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Unchecked_Convert_To (RTE (RE_Address),
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Typ_Tag_Node))));
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Insert_Action (Related_Nod,
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Make_Object_Declaration (Loc,
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Defining_Identifier => Index,
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Constant_Present => True,
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Object_Definition => New_Occurrence_Of (Standard_Integer, Loc),
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Expression =>
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Make_Op_Subtract (Loc,
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Left_Opnd =>
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Make_Selected_Component (Loc,
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Prefix => New_Occurrence_Of (Obj_TSD, Loc),
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Selector_Name =>
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New_Occurrence_Of
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(RTE_Record_Component (RE_Idepth), Loc)),
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Right_Opnd =>
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Make_Selected_Component (Loc,
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Prefix => New_Occurrence_Of (Typ_TSD, Loc),
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Selector_Name =>
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New_Occurrence_Of
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(RTE_Record_Component (RE_Idepth), Loc)))));
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New_Node :=
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Make_And_Then (Loc,
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Left_Opnd =>
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Make_Op_Ge (Loc,
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Left_Opnd => New_Occurrence_Of (Index, Loc),
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Right_Opnd => Make_Integer_Literal (Loc, Uint_0)),
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Right_Opnd =>
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Make_Op_Eq (Loc,
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Left_Opnd =>
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Make_Indexed_Component (Loc,
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Prefix =>
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Make_Selected_Component (Loc,
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Prefix => New_Occurrence_Of (Obj_TSD, Loc),
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Selector_Name =>
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New_Occurrence_Of
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(RTE_Record_Component (RE_Tags_Table), Loc)),
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Expressions =>
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New_List (New_Occurrence_Of (Index, Loc))),
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Right_Opnd => Typ_Tag_Node));
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end Build_CW_Membership;
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--------------
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-- Build_DT --
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--------------
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function Build_DT
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id
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is
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begin
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return
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Make_Function_Call (Loc,
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Name => New_Occurrence_Of (RTE (RE_DT), Loc),
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Parameter_Associations => New_List (
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Unchecked_Convert_To (RTE (RE_Tag), Tag_Node)));
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end Build_DT;
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----------------------------
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-- Build_Get_Access_Level --
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----------------------------
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function Build_Get_Access_Level
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id
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is
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begin
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return
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Make_Selected_Component (Loc,
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Prefix =>
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Build_TSD (Loc,
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Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
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Selector_Name =>
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New_Occurrence_Of
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(RTE_Record_Component (RE_Access_Level), Loc));
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end Build_Get_Access_Level;
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-------------------------
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-- Build_Get_Alignment --
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-------------------------
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function Build_Get_Alignment
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id
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is
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begin
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return
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Make_Selected_Component (Loc,
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Prefix =>
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Build_TSD (Loc, Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
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Selector_Name =>
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New_Occurrence_Of (RTE_Record_Component (RE_Alignment), Loc));
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end Build_Get_Alignment;
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------------------------------------------
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-- Build_Get_Predefined_Prim_Op_Address --
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------------------------------------------
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procedure Build_Get_Predefined_Prim_Op_Address
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(Loc : Source_Ptr;
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Position : Uint;
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Tag_Node : in out Node_Id;
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New_Node : out Node_Id)
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is
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Ctrl_Tag : Node_Id;
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begin
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Ctrl_Tag := Unchecked_Convert_To (RTE (RE_Address), Tag_Node);
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-- Unchecked_Convert_To relocates the controlling tag node and therefore
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-- we must update it.
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Tag_Node := Expression (Ctrl_Tag);
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-- Build code that retrieves the address of the dispatch table
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-- containing the predefined Ada primitives:
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--
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-- Generate:
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-- To_Predef_Prims_Table_Ptr
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-- (To_Addr_Ptr (To_Address (Tag) - Predef_Prims_Offset).all);
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New_Node :=
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Make_Indexed_Component (Loc,
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Prefix =>
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Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
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Make_Explicit_Dereference (Loc,
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Unchecked_Convert_To (RTE (RE_Addr_Ptr),
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Make_Function_Call (Loc,
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Name =>
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Make_Expanded_Name (Loc,
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Chars => Name_Op_Subtract,
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Prefix =>
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New_Occurrence_Of
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(RTU_Entity (System_Storage_Elements), Loc),
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Selector_Name =>
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Make_Identifier (Loc, Name_Op_Subtract)),
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Parameter_Associations => New_List (
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Ctrl_Tag,
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New_Occurrence_Of
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(RTE (RE_DT_Predef_Prims_Offset), Loc)))))),
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Expressions =>
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New_List (Make_Integer_Literal (Loc, Position)));
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end Build_Get_Predefined_Prim_Op_Address;
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-----------------------------
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-- Build_Inherit_CPP_Prims --
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-----------------------------
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function Build_Inherit_CPP_Prims (Typ : Entity_Id) return List_Id is
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Loc : constant Source_Ptr := Sloc (Typ);
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CPP_Nb_Prims : constant Nat := CPP_Num_Prims (Typ);
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CPP_Table : array (1 .. CPP_Nb_Prims) of Boolean := (others => False);
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CPP_Typ : constant Entity_Id := Enclosing_CPP_Parent (Typ);
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Result : constant List_Id := New_List;
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Parent_Typ : constant Entity_Id := Etype (Typ);
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E : Entity_Id;
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Elmt : Elmt_Id;
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Parent_Tag : Entity_Id;
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Prim : Entity_Id;
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Prim_Pos : Nat;
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Typ_Tag : Entity_Id;
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begin
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pragma Assert (not Is_CPP_Class (Typ));
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-- No code needed if this type has no primitives inherited from C++
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if CPP_Nb_Prims = 0 then
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return Result;
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end if;
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-- Stage 1: Inherit and override C++ slots of the primary dispatch table
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-- Generate:
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-- Typ'Tag (Prim_Pos) := Prim'Unrestricted_Access;
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Parent_Tag := Node (First_Elmt (Access_Disp_Table (Parent_Typ)));
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Typ_Tag := Node (First_Elmt (Access_Disp_Table (Typ)));
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Elmt := First_Elmt (Primitive_Operations (Typ));
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while Present (Elmt) loop
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Prim := Node (Elmt);
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E := Ultimate_Alias (Prim);
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Prim_Pos := UI_To_Int (DT_Position (E));
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-- Skip predefined, abstract, and eliminated primitives. Skip also
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-- primitives not located in the C++ part of the dispatch table.
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if not Is_Predefined_Dispatching_Operation (Prim)
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and then not Is_Predefined_Dispatching_Operation (E)
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and then not Present (Interface_Alias (Prim))
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and then not Is_Abstract_Subprogram (E)
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and then not Is_Eliminated (E)
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and then Prim_Pos <= CPP_Nb_Prims
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and then Find_Dispatching_Type (E) = Typ
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then
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-- Remember that this slot is used
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pragma Assert (CPP_Table (Prim_Pos) = False);
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CPP_Table (Prim_Pos) := True;
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Append_To (Result,
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Make_Assignment_Statement (Loc,
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Name =>
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Make_Indexed_Component (Loc,
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Prefix =>
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Make_Explicit_Dereference (Loc,
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Unchecked_Convert_To
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(Node (Last_Elmt (Access_Disp_Table (Typ))),
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New_Occurrence_Of (Typ_Tag, Loc))),
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Expressions =>
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New_List (Make_Integer_Literal (Loc, Prim_Pos))),
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Expression =>
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Unchecked_Convert_To (RTE (RE_Prim_Ptr),
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Make_Attribute_Reference (Loc,
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Prefix => New_Occurrence_Of (E, Loc),
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Attribute_Name => Name_Unrestricted_Access))));
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end if;
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Next_Elmt (Elmt);
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end loop;
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-- If all primitives have been overridden then there is no need to copy
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-- from Typ's parent its dispatch table. Otherwise, if some primitive is
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-- inherited from the parent we copy only the C++ part of the dispatch
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-- table from the parent before the assignments that initialize the
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-- overridden primitives.
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-- Generate:
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-- type CPP_TypG is array (1 .. CPP_Nb_Prims) ofd Prim_Ptr;
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-- type CPP_TypH is access CPP_TypG;
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-- CPP_TypG!(Typ_Tag).all := CPP_TypG!(Parent_Tag).all;
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|
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-- Note: There is no need to duplicate the declarations of CPP_TypG and
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-- CPP_TypH because, for expansion of dispatching calls, these
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-- entities are stored in the last elements of Access_Disp_Table.
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for J in CPP_Table'Range loop
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if not CPP_Table (J) then
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Prepend_To (Result,
|
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Make_Assignment_Statement (Loc,
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Name =>
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Make_Explicit_Dereference (Loc,
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Unchecked_Convert_To
|
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(Node (Last_Elmt (Access_Disp_Table (CPP_Typ))),
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New_Occurrence_Of (Typ_Tag, Loc))),
|
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Expression =>
|
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Make_Explicit_Dereference (Loc,
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Unchecked_Convert_To
|
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(Node (Last_Elmt (Access_Disp_Table (CPP_Typ))),
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New_Occurrence_Of (Parent_Tag, Loc)))));
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exit;
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end if;
|
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end loop;
|
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|
|
-- Stage 2: Inherit and override C++ slots of secondary dispatch tables
|
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|
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declare
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Iface : Entity_Id;
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Iface_Nb_Prims : Nat;
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Parent_Ifaces_List : Elist_Id;
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Parent_Ifaces_Comp_List : Elist_Id;
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Parent_Ifaces_Tag_List : Elist_Id;
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Parent_Iface_Tag_Elmt : Elmt_Id;
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Typ_Ifaces_List : Elist_Id;
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Typ_Ifaces_Comp_List : Elist_Id;
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Typ_Ifaces_Tag_List : Elist_Id;
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Typ_Iface_Tag_Elmt : Elmt_Id;
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begin
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Collect_Interfaces_Info
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(T => Parent_Typ,
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Ifaces_List => Parent_Ifaces_List,
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Components_List => Parent_Ifaces_Comp_List,
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Tags_List => Parent_Ifaces_Tag_List);
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|
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Collect_Interfaces_Info
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(T => Typ,
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Ifaces_List => Typ_Ifaces_List,
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Components_List => Typ_Ifaces_Comp_List,
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Tags_List => Typ_Ifaces_Tag_List);
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Parent_Iface_Tag_Elmt := First_Elmt (Parent_Ifaces_Tag_List);
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Typ_Iface_Tag_Elmt := First_Elmt (Typ_Ifaces_Tag_List);
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while Present (Parent_Iface_Tag_Elmt) loop
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Parent_Tag := Node (Parent_Iface_Tag_Elmt);
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Typ_Tag := Node (Typ_Iface_Tag_Elmt);
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|
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pragma Assert
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(Related_Type (Parent_Tag) = Related_Type (Typ_Tag));
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Iface := Related_Type (Parent_Tag);
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Iface_Nb_Prims :=
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UI_To_Int (DT_Entry_Count (First_Tag_Component (Iface)));
|
|
|
|
if Iface_Nb_Prims > 0 then
|
|
|
|
-- Update slots of overridden primitives
|
|
|
|
declare
|
|
Last_Nod : constant Node_Id := Last (Result);
|
|
Nb_Prims : constant Nat := UI_To_Int
|
|
(DT_Entry_Count
|
|
(First_Tag_Component (Iface)));
|
|
Elmt : Elmt_Id;
|
|
Prim : Entity_Id;
|
|
E : Entity_Id;
|
|
Prim_Pos : Nat;
|
|
|
|
Prims_Table : array (1 .. Nb_Prims) of Boolean;
|
|
|
|
begin
|
|
Prims_Table := (others => False);
|
|
|
|
Elmt := First_Elmt (Primitive_Operations (Typ));
|
|
while Present (Elmt) loop
|
|
Prim := Node (Elmt);
|
|
E := Ultimate_Alias (Prim);
|
|
|
|
if not Is_Predefined_Dispatching_Operation (Prim)
|
|
and then Present (Interface_Alias (Prim))
|
|
and then Find_Dispatching_Type (Interface_Alias (Prim))
|
|
= Iface
|
|
and then not Is_Abstract_Subprogram (E)
|
|
and then not Is_Eliminated (E)
|
|
and then Find_Dispatching_Type (E) = Typ
|
|
then
|
|
Prim_Pos := UI_To_Int (DT_Position (Prim));
|
|
|
|
-- Remember that this slot is already initialized
|
|
|
|
pragma Assert (Prims_Table (Prim_Pos) = False);
|
|
Prims_Table (Prim_Pos) := True;
|
|
|
|
Append_To (Result,
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Indexed_Component (Loc,
|
|
Prefix =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To
|
|
(Node
|
|
(Last_Elmt
|
|
(Access_Disp_Table (Iface))),
|
|
New_Occurrence_Of (Typ_Tag, Loc))),
|
|
Expressions =>
|
|
New_List
|
|
(Make_Integer_Literal (Loc, Prim_Pos))),
|
|
|
|
Expression =>
|
|
Unchecked_Convert_To (RTE (RE_Prim_Ptr),
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (E, Loc),
|
|
Attribute_Name =>
|
|
Name_Unrestricted_Access))));
|
|
end if;
|
|
|
|
Next_Elmt (Elmt);
|
|
end loop;
|
|
|
|
-- Check if all primitives from the parent have been
|
|
-- overridden (to avoid copying the whole secondary
|
|
-- table from the parent).
|
|
|
|
-- IfaceG!(Typ_Sec_Tag).all := IfaceG!(Parent_Sec_Tag).all;
|
|
|
|
for J in Prims_Table'Range loop
|
|
if not Prims_Table (J) then
|
|
Insert_After (Last_Nod,
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To
|
|
(Node (Last_Elmt (Access_Disp_Table (Iface))),
|
|
New_Occurrence_Of (Typ_Tag, Loc))),
|
|
Expression =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To
|
|
(Node (Last_Elmt (Access_Disp_Table (Iface))),
|
|
New_Occurrence_Of (Parent_Tag, Loc)))));
|
|
exit;
|
|
end if;
|
|
end loop;
|
|
end;
|
|
end if;
|
|
|
|
Next_Elmt (Typ_Iface_Tag_Elmt);
|
|
Next_Elmt (Parent_Iface_Tag_Elmt);
|
|
end loop;
|
|
end;
|
|
|
|
return Result;
|
|
end Build_Inherit_CPP_Prims;
|
|
|
|
-------------------------
|
|
-- Build_Inherit_Prims --
|
|
-------------------------
|
|
|
|
function Build_Inherit_Prims
|
|
(Loc : Source_Ptr;
|
|
Typ : Entity_Id;
|
|
Old_Tag_Node : Node_Id;
|
|
New_Tag_Node : Node_Id;
|
|
Num_Prims : Nat) return Node_Id
|
|
is
|
|
begin
|
|
if RTE_Available (RE_DT) then
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Slice (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Build_DT (Loc, New_Tag_Node),
|
|
Selector_Name =>
|
|
New_Occurrence_Of
|
|
(RTE_Record_Component (RE_Prims_Ptr), Loc)),
|
|
Discrete_Range =>
|
|
Make_Range (Loc,
|
|
Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
High_Bound => Make_Integer_Literal (Loc, Num_Prims))),
|
|
|
|
Expression =>
|
|
Make_Slice (Loc,
|
|
Prefix =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Build_DT (Loc, Old_Tag_Node),
|
|
Selector_Name =>
|
|
New_Occurrence_Of
|
|
(RTE_Record_Component (RE_Prims_Ptr), Loc)),
|
|
Discrete_Range =>
|
|
Make_Range (Loc,
|
|
Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
High_Bound => Make_Integer_Literal (Loc, Num_Prims))));
|
|
else
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Slice (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To
|
|
(Node (Last_Elmt (Access_Disp_Table (Typ))),
|
|
New_Tag_Node),
|
|
Discrete_Range =>
|
|
Make_Range (Loc,
|
|
Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
High_Bound => Make_Integer_Literal (Loc, Num_Prims))),
|
|
|
|
Expression =>
|
|
Make_Slice (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To
|
|
(Node (Last_Elmt (Access_Disp_Table (Typ))),
|
|
Old_Tag_Node),
|
|
Discrete_Range =>
|
|
Make_Range (Loc,
|
|
Low_Bound => Make_Integer_Literal (Loc, 1),
|
|
High_Bound => Make_Integer_Literal (Loc, Num_Prims))));
|
|
end if;
|
|
end Build_Inherit_Prims;
|
|
|
|
-------------------------------
|
|
-- Build_Get_Prim_Op_Address --
|
|
-------------------------------
|
|
|
|
procedure Build_Get_Prim_Op_Address
|
|
(Loc : Source_Ptr;
|
|
Typ : Entity_Id;
|
|
Position : Uint;
|
|
Tag_Node : in out Node_Id;
|
|
New_Node : out Node_Id)
|
|
is
|
|
New_Prefix : Node_Id;
|
|
|
|
begin
|
|
pragma Assert
|
|
(Position <= DT_Entry_Count (First_Tag_Component (Typ)));
|
|
|
|
-- At the end of the Access_Disp_Table list we have the type
|
|
-- declaration required to convert the tag into a pointer to
|
|
-- the prims_ptr table (see Freeze_Record_Type).
|
|
|
|
New_Prefix :=
|
|
Unchecked_Convert_To
|
|
(Node (Last_Elmt (Access_Disp_Table (Typ))), Tag_Node);
|
|
|
|
-- Unchecked_Convert_To relocates the controlling tag node and therefore
|
|
-- we must update it.
|
|
|
|
Tag_Node := Expression (New_Prefix);
|
|
|
|
New_Node :=
|
|
Make_Indexed_Component (Loc,
|
|
Prefix => New_Prefix,
|
|
Expressions => New_List (Make_Integer_Literal (Loc, Position)));
|
|
end Build_Get_Prim_Op_Address;
|
|
|
|
-----------------------------
|
|
-- Build_Get_Transportable --
|
|
-----------------------------
|
|
|
|
function Build_Get_Transportable
|
|
(Loc : Source_Ptr;
|
|
Tag_Node : Node_Id) return Node_Id
|
|
is
|
|
begin
|
|
return
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Build_TSD (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
|
|
Selector_Name =>
|
|
New_Occurrence_Of
|
|
(RTE_Record_Component (RE_Transportable), Loc));
|
|
end Build_Get_Transportable;
|
|
|
|
------------------------------------
|
|
-- Build_Inherit_Predefined_Prims --
|
|
------------------------------------
|
|
|
|
function Build_Inherit_Predefined_Prims
|
|
(Loc : Source_Ptr;
|
|
Old_Tag_Node : Node_Id;
|
|
New_Tag_Node : Node_Id) return Node_Id
|
|
is
|
|
begin
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Slice (Loc,
|
|
Prefix =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Addr_Ptr),
|
|
New_Tag_Node)))),
|
|
Discrete_Range => Make_Range (Loc,
|
|
Make_Integer_Literal (Loc, Uint_1),
|
|
New_Occurrence_Of (RTE (RE_Max_Predef_Prims), Loc))),
|
|
|
|
Expression =>
|
|
Make_Slice (Loc,
|
|
Prefix =>
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Addr_Ptr),
|
|
Old_Tag_Node)))),
|
|
Discrete_Range =>
|
|
Make_Range (Loc,
|
|
Make_Integer_Literal (Loc, 1),
|
|
New_Occurrence_Of (RTE (RE_Max_Predef_Prims), Loc))));
|
|
end Build_Inherit_Predefined_Prims;
|
|
|
|
-------------------------
|
|
-- Build_Offset_To_Top --
|
|
-------------------------
|
|
|
|
function Build_Offset_To_Top
|
|
(Loc : Source_Ptr;
|
|
This_Node : Node_Id) return Node_Id
|
|
is
|
|
Tag_Node : Node_Id;
|
|
|
|
begin
|
|
Tag_Node :=
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Tag_Ptr), This_Node));
|
|
|
|
return
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Offset_To_Top_Ptr),
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
Make_Expanded_Name (Loc,
|
|
Chars => Name_Op_Subtract,
|
|
Prefix =>
|
|
New_Occurrence_Of
|
|
(RTU_Entity (System_Storage_Elements), Loc),
|
|
Selector_Name => Make_Identifier (Loc, Name_Op_Subtract)),
|
|
Parameter_Associations => New_List (
|
|
Unchecked_Convert_To (RTE (RE_Address), Tag_Node),
|
|
New_Occurrence_Of
|
|
(RTE (RE_DT_Offset_To_Top_Offset), Loc)))));
|
|
end Build_Offset_To_Top;
|
|
|
|
------------------------------------------
|
|
-- Build_Set_Predefined_Prim_Op_Address --
|
|
------------------------------------------
|
|
|
|
function Build_Set_Predefined_Prim_Op_Address
|
|
(Loc : Source_Ptr;
|
|
Tag_Node : Node_Id;
|
|
Position : Uint;
|
|
Address_Node : Node_Id) return Node_Id
|
|
is
|
|
begin
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Indexed_Component (Loc,
|
|
Prefix =>
|
|
Unchecked_Convert_To (RTE (RE_Predef_Prims_Table_Ptr),
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Addr_Ptr), Tag_Node))),
|
|
Expressions =>
|
|
New_List (Make_Integer_Literal (Loc, Position))),
|
|
|
|
Expression => Address_Node);
|
|
end Build_Set_Predefined_Prim_Op_Address;
|
|
|
|
-------------------------------
|
|
-- Build_Set_Prim_Op_Address --
|
|
-------------------------------
|
|
|
|
function Build_Set_Prim_Op_Address
|
|
(Loc : Source_Ptr;
|
|
Typ : Entity_Id;
|
|
Tag_Node : Node_Id;
|
|
Position : Uint;
|
|
Address_Node : Node_Id) return Node_Id
|
|
is
|
|
Ctrl_Tag : Node_Id := Tag_Node;
|
|
New_Node : Node_Id;
|
|
|
|
begin
|
|
Build_Get_Prim_Op_Address (Loc, Typ, Position, Ctrl_Tag, New_Node);
|
|
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name => New_Node,
|
|
Expression => Address_Node);
|
|
end Build_Set_Prim_Op_Address;
|
|
|
|
-----------------------------
|
|
-- Build_Set_Size_Function --
|
|
-----------------------------
|
|
|
|
function Build_Set_Size_Function
|
|
(Loc : Source_Ptr;
|
|
Tag_Node : Node_Id;
|
|
Size_Func : Entity_Id) return Node_Id is
|
|
begin
|
|
pragma Assert (Chars (Size_Func) = Name_uSize
|
|
and then RTE_Record_Component_Available (RE_Size_Func));
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Name =>
|
|
Make_Selected_Component (Loc,
|
|
Prefix =>
|
|
Build_TSD (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Address), Tag_Node)),
|
|
Selector_Name =>
|
|
New_Occurrence_Of
|
|
(RTE_Record_Component (RE_Size_Func), Loc)),
|
|
Expression =>
|
|
Unchecked_Convert_To (RTE (RE_Size_Ptr),
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix => New_Occurrence_Of (Size_Func, Loc),
|
|
Attribute_Name => Name_Unrestricted_Access)));
|
|
end Build_Set_Size_Function;
|
|
|
|
------------------------------------
|
|
-- Build_Set_Static_Offset_To_Top --
|
|
------------------------------------
|
|
|
|
function Build_Set_Static_Offset_To_Top
|
|
(Loc : Source_Ptr;
|
|
Iface_Tag : Node_Id;
|
|
Offset_Value : Node_Id) return Node_Id is
|
|
begin
|
|
return
|
|
Make_Assignment_Statement (Loc,
|
|
Make_Explicit_Dereference (Loc,
|
|
Unchecked_Convert_To (RTE (RE_Offset_To_Top_Ptr),
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
Make_Expanded_Name (Loc,
|
|
Chars => Name_Op_Subtract,
|
|
Prefix =>
|
|
New_Occurrence_Of
|
|
(RTU_Entity (System_Storage_Elements), Loc),
|
|
Selector_Name => Make_Identifier (Loc, Name_Op_Subtract)),
|
|
Parameter_Associations => New_List (
|
|
Unchecked_Convert_To (RTE (RE_Address), Iface_Tag),
|
|
New_Occurrence_Of
|
|
(RTE (RE_DT_Offset_To_Top_Offset), Loc))))),
|
|
Offset_Value);
|
|
end Build_Set_Static_Offset_To_Top;
|
|
|
|
---------------
|
|
-- Build_TSD --
|
|
---------------
|
|
|
|
function Build_TSD
|
|
(Loc : Source_Ptr;
|
|
Tag_Node_Addr : Node_Id) return Node_Id is
|
|
begin
|
|
return
|
|
Unchecked_Convert_To (RTE (RE_Type_Specific_Data_Ptr),
|
|
Make_Explicit_Dereference (Loc,
|
|
Prefix => Unchecked_Convert_To (RTE (RE_Addr_Ptr),
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
Make_Expanded_Name (Loc,
|
|
Chars => Name_Op_Subtract,
|
|
Prefix =>
|
|
New_Occurrence_Of
|
|
(RTU_Entity (System_Storage_Elements), Loc),
|
|
Selector_Name => Make_Identifier (Loc, Name_Op_Subtract)),
|
|
|
|
Parameter_Associations => New_List (
|
|
Tag_Node_Addr,
|
|
New_Occurrence_Of
|
|
(RTE (RE_DT_Typeinfo_Ptr_Size), Loc))))));
|
|
end Build_TSD;
|
|
|
|
end Exp_Atag;
|