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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ A T A G --
-- --
-- S p e c --
-- --
-- Copyright (C) 2006-2018, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Atree; use Atree;
with Einfo; use Einfo;
with Elists; use Elists;
with Exp_Disp; use Exp_Disp;
with Exp_Util; use Exp_Util;
with Namet; use Namet;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
with Rtsfind; use Rtsfind;
with Sinfo; use Sinfo;
with Sem_Aux; use Sem_Aux;
with Sem_Disp; use Sem_Disp;
with Sem_Util; use Sem_Util;
with Stand; use Stand;
with Snames; use Snames;
with Tbuild; use Tbuild;
package body Exp_Atag is
-----------------------
-- Local Subprograms --
-----------------------
function Build_DT
(Loc : Source_Ptr;
Tag_Node : Node_Id) return Node_Id;
-- Build code that displaces the Tag to reference the base of the wrapper
-- record
--
-- Generates:
-- To_Dispatch_Table_Ptr
-- (To_Address (Tag_Node) - Tag_Node.Prims_Ptr'Position);
function Build_TSD
(Loc : Source_Ptr;
Tag_Node_Addr : Node_Id) return Node_Id;
-- Build code that retrieves the address of the record containing the Type
-- Specific Data generated by GNAT.
--
-- Generate: To_Type_Specific_Data_Ptr
-- (To_Addr_Ptr (Tag_Node_Addr - Typeinfo_Offset).all);
------------------------------------------------
-- Build_Common_Dispatching_Select_Statements --
------------------------------------------------
procedure Build_Common_Dispatching_Select_Statements
(Typ : Entity_Id;
Stmts : List_Id)
is
Loc : constant Source_Ptr := Sloc (Typ);
Tag_Node : Node_Id;
begin
-- Generate:
-- C := get_prim_op_kind (tag! (<type>VP), S);
-- where C is the out parameter capturing the call kind and S is the
-- dispatch table slot number.
if Tagged_Type_Expansion then
Tag_Node :=
Unchecked_Convert_To (RTE (RE_Tag),
New_Occurrence_Of
(Node (First_Elmt (Access_Disp_Table (Typ))), Loc));
else
Tag_Node :=
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Typ, Loc),
Attribute_Name => Name_Tag);
end if;
Append_To (Stmts,
Make_Assignment_Statement (Loc,
Name => Make_Identifier (Loc, Name_uC),
Expression =>
Make_Function_Call (Loc,
Name =>
New_Occurrence_Of (RTE (RE_Get_Prim_Op_Kind), Loc),
Parameter_Associations => New_List (
Tag_Node,
Make_Identifier (Loc, Name_uS)))));
-- Generate:
-- if C = POK_Procedure
-- or else C = POK_Protected_Procedure
-- or else C = POK_Task_Procedure;
-- then
-- F := True;
-- return;
-- where F is the out parameter capturing the status of a potential
-- entry call.
Append_To (Stmts,
Make_If_Statement (Loc,
Condition =>
Make_Or_Else (Loc,
Left_Opnd =>
Make_Op_Eq (Loc,
Left_Opnd => Make_Identifier (Loc, Name_uC),
Right_Opnd =>
New_Occurrence_Of (RTE (RE_POK_Procedure), Loc)),
Right_Opnd =>
Make_Or_Else (Loc,
Left_Opnd =>
Make_Op_Eq (Loc,
Left_Opnd => Make_Identifier (Loc, Name_uC),
Right_Opnd =>
New_Occurrence_Of
(RTE (RE_POK_Protected_Procedure), Loc)),
Right_Opnd =>
Make_Op_Eq (Loc,
Left_Opnd => Make_Identifier (Loc, Name_uC),
Right_Opnd =>
New_Occurrence_Of
(RTE (RE_POK_Task_Procedure), Loc)))),
Then_Statements =>
New_List (
Make_Assignment_Statement (Loc,
Name => Make_Identifier (Loc, Name_uF),
Expression => New_Occurrence_Of (Standard_True, Loc)),
Make_Simple_Return_Statement (Loc))));
end Build_Common_Dispatching_Select_Statements;
-------------------------
-- Build_CW_Membership --
-------------------------
procedure Build_CW_Membership
(Loc : Source_Ptr;
Obj_Tag_Node : in out Node_Id;
Typ_Tag_Node : Node_Id;
Related_Nod : Node_Id;
New_Node : out Node_Id)
is
Tag_Addr : constant Entity_Id := Make_Temporary (Loc, 'D', Obj_Tag_Node);
Obj_TSD : constant Entity_Id := Make_Temporary (Loc, 'D');
Typ_TSD : constant Entity_Id := Make_Temporary (Loc, 'D');
Index : constant Entity_Id := Make_Temporary (Loc, 'D');
begin
-- Generate:
-- Tag_Addr : constant Tag := Address!(Obj_Tag);
-- Obj_TSD : constant Type_Specific_Data_Ptr
-- := Build_TSD (Tag_Addr);
-- Typ_TSD : constant Type_Specific_Data_Ptr
-- := Build_TSD (Address!(Typ_Tag));
-- Index : constant Integer := Obj_TSD.Idepth - Typ_TSD.Idepth
-- Index >= 0 and then Obj_TSD.Tags_Table (Index) = Typ'Tag
Insert_Action (Related_Nod,
Make_Object_Declaration (Loc,
Defining_Identifier => Tag_Addr,
Constant_Present => True,
Object_Definition => New_Occurrence_Of (RTE (RE_Address), Loc),
Expression => Unchecked_Convert_To
(RTE (RE_Address), Obj_Tag_Node)));
-- Unchecked_Convert_To relocates Obj_Tag_Node and therefore we must
-- update it.
Obj_Tag_Node := Expression (Expression (Parent (Tag_Addr)));
Insert_Action (Related_Nod,
Make_Object_Declaration (Loc,
Defining_Identifier => Obj_TSD,
Constant_Present => True,
Object_Definition =>
New_Occurrence_Of (RTE (RE_Type_Specific_Data_Ptr), Loc),
Expression =>
Build_TSD (Loc, New_Occurrence_Of (Tag_Addr, Loc))),
Suppress => All_Checks);
Insert_Action (Related_Nod,
Make_Object_Declaration (Loc,
Defining_Identifier => Typ_TSD,
Constant_Present => True,
Object_Definition =>
New_Occurrence_Of (RTE (RE_Type_Specific_Data_Ptr), Loc),
Expression =>
Build_TSD (Loc,
Unchecked_Convert_To (RTE (RE_Address), Typ_Tag_Node))),
Suppress => All_Checks);
Insert_Action (Related_Nod,
Make_Object_Declaration (Loc,
Defining_Identifier => Index,
Constant_Present => True,
Object_Definition => New_Occurrence_Of (Standard_Integer, Loc),
Expression =>
Make_Op_Subtract (Loc,
Left_Opnd =>
Make_Selected_Component (Loc,
Prefix => New_Occurrence_Of (Obj_TSD, Loc),
Selector_Name =>
New_Occurrence_Of
(RTE_Record_Component (RE_Idepth), Loc)),
Right_Opnd =>
Make_Selected_Component (Loc,
Prefix => New_Occurrence_Of (Typ_TSD, Loc),
Selector_Name =>
New_Occurrence_Of
(RTE_Record_Component (RE_Idepth), Loc)))),
Suppress => All_Checks);
New_Node :=
Make_And_Then (Loc,
Left_Opnd =>
Make_Op_Ge (Loc,
Left_Opnd => New_Occurrence_Of (Index, Loc),
Right_Opnd => Make_Integer_Literal (Loc, Uint_0)),
Right_Opnd =>
Make_Op_Eq (Loc,
Left_Opnd =>
Make_Indexed_Component (Loc,
Prefix =>
Make_Selected_Component (Loc,
Prefix => New_Occurrence_Of (Obj_TSD, Loc),
Selector_Name =>
New_Occurrence_Of
(RTE_Record_Component (RE_Tags_Table), Loc)),
Expressions =>
New_List (New_Occurrence_Of (Index, Loc))),
Right_Opnd => Typ_Tag_Node));
end Build_CW_Membership;
--------------
-- Build_DT --
--------------
function Build_DT
(Loc : Source_Ptr;
Tag_Node : Node_Id) return Node_Id
is
begin
return
Make_Function_Call (Loc,
Name => New_Occurrence_Of (RTE (RE_DT), Loc),
Parameter_Associations => New_List (
Unchecked_Convert_To (RTE (RE_Tag), Tag_Node)));
end Build_DT;
----------------------------
-- Build_Get_Access_Level --
----------------------------
function Build_Get_Access_Level
(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_Access_Level), Loc));
end Build_Get_Access_Level;
-------------------------
-- Build_Get_Alignment --
-------------------------
function Build_Get_Alignment
(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_Alignment), Loc));
end Build_Get_Alignment;
------------------------------------------
-- Build_Get_Predefined_Prim_Op_Address --
------------------------------------------
procedure Build_Get_Predefined_Prim_Op_Address
(Loc : Source_Ptr;
Position : Uint;
Tag_Node : in out Node_Id;
New_Node : out Node_Id)
is
Ctrl_Tag : Node_Id;
begin
Ctrl_Tag := Unchecked_Convert_To (RTE (RE_Address), Tag_Node);
-- Unchecked_Convert_To relocates the controlling tag node and therefore
-- we must update it.
Tag_Node := Expression (Ctrl_Tag);
-- Build code that retrieves the address of the dispatch table
-- containing the predefined Ada primitives:
--
-- Generate:
-- To_Predef_Prims_Table_Ptr
-- (To_Addr_Ptr (To_Address (Tag) - Predef_Prims_Offset).all);
New_Node :=
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),
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 (
Ctrl_Tag,
New_Occurrence_Of
(RTE (RE_DT_Predef_Prims_Offset), Loc)))))),
Expressions =>
New_List (Make_Integer_Literal (Loc, Position)));
end Build_Get_Predefined_Prim_Op_Address;
-----------------------------
-- Build_Inherit_CPP_Prims --
-----------------------------
function Build_Inherit_CPP_Prims (Typ : Entity_Id) return List_Id is
Loc : constant Source_Ptr := Sloc (Typ);
CPP_Nb_Prims : constant Nat := CPP_Num_Prims (Typ);
CPP_Table : array (1 .. CPP_Nb_Prims) of Boolean := (others => False);
CPP_Typ : constant Entity_Id := Enclosing_CPP_Parent (Typ);
Result : constant List_Id := New_List;
Parent_Typ : constant Entity_Id := Etype (Typ);
E : Entity_Id;
Elmt : Elmt_Id;
Parent_Tag : Entity_Id;
Prim : Entity_Id;
Prim_Pos : Nat;
Typ_Tag : Entity_Id;
begin
pragma Assert (not Is_CPP_Class (Typ));
-- No code needed if this type has no primitives inherited from C++
if CPP_Nb_Prims = 0 then
return Result;
end if;
-- Stage 1: Inherit and override C++ slots of the primary dispatch table
-- Generate:
-- Typ'Tag (Prim_Pos) := Prim'Unrestricted_Access;
Parent_Tag := Node (First_Elmt (Access_Disp_Table (Parent_Typ)));
Typ_Tag := Node (First_Elmt (Access_Disp_Table (Typ)));
Elmt := First_Elmt (Primitive_Operations (Typ));
while Present (Elmt) loop
Prim := Node (Elmt);
E := Ultimate_Alias (Prim);
Prim_Pos := UI_To_Int (DT_Position (E));
-- Skip predefined, abstract, and eliminated primitives. Skip also
-- primitives not located in the C++ part of the dispatch table.
if not Is_Predefined_Dispatching_Operation (Prim)
and then not Is_Predefined_Dispatching_Operation (E)
and then not Present (Interface_Alias (Prim))
and then not Is_Abstract_Subprogram (E)
and then not Is_Eliminated (E)
and then Prim_Pos <= CPP_Nb_Prims
and then Find_Dispatching_Type (E) = Typ
then
-- Remember that this slot is used
pragma Assert (CPP_Table (Prim_Pos) = False);
CPP_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 (Typ))),
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;
-- If all primitives have been overridden then there is no need to copy
-- from Typ's parent its dispatch table. Otherwise, if some primitive is
-- inherited from the parent we copy only the C++ part of the dispatch
-- table from the parent before the assignments that initialize the
-- overridden primitives.
-- Generate:
-- type CPP_TypG is array (1 .. CPP_Nb_Prims) ofd Prim_Ptr;
-- type CPP_TypH is access CPP_TypG;
-- CPP_TypG!(Typ_Tag).all := CPP_TypG!(Parent_Tag).all;
-- Note: There is no need to duplicate the declarations of CPP_TypG and
-- CPP_TypH because, for expansion of dispatching calls, these
-- entities are stored in the last elements of Access_Disp_Table.
for J in CPP_Table'Range loop
if not CPP_Table (J) then
Prepend_To (Result,
Make_Assignment_Statement (Loc,
Name =>
Make_Explicit_Dereference (Loc,
Unchecked_Convert_To
(Node (Last_Elmt (Access_Disp_Table (CPP_Typ))),
New_Occurrence_Of (Typ_Tag, Loc))),
Expression =>
Make_Explicit_Dereference (Loc,
Unchecked_Convert_To
(Node (Last_Elmt (Access_Disp_Table (CPP_Typ))),
New_Occurrence_Of (Parent_Tag, Loc)))));
exit;
end if;
end loop;
-- Stage 2: Inherit and override C++ slots of secondary dispatch tables
declare
Iface : Entity_Id;
Iface_Nb_Prims : Nat;
Parent_Ifaces_List : Elist_Id;
Parent_Ifaces_Comp_List : Elist_Id;
Parent_Ifaces_Tag_List : Elist_Id;
Parent_Iface_Tag_Elmt : Elmt_Id;
Typ_Ifaces_List : Elist_Id;
Typ_Ifaces_Comp_List : Elist_Id;
Typ_Ifaces_Tag_List : Elist_Id;
Typ_Iface_Tag_Elmt : Elmt_Id;
begin
Collect_Interfaces_Info
(T => Parent_Typ,
Ifaces_List => Parent_Ifaces_List,
Components_List => Parent_Ifaces_Comp_List,
Tags_List => Parent_Ifaces_Tag_List);
Collect_Interfaces_Info
(T => Typ,
Ifaces_List => Typ_Ifaces_List,
Components_List => Typ_Ifaces_Comp_List,
Tags_List => Typ_Ifaces_Tag_List);
Parent_Iface_Tag_Elmt := First_Elmt (Parent_Ifaces_Tag_List);
Typ_Iface_Tag_Elmt := First_Elmt (Typ_Ifaces_Tag_List);
while Present (Parent_Iface_Tag_Elmt) loop
Parent_Tag := Node (Parent_Iface_Tag_Elmt);
Typ_Tag := Node (Typ_Iface_Tag_Elmt);
pragma Assert
(Related_Type (Parent_Tag) = Related_Type (Typ_Tag));
Iface := Related_Type (Parent_Tag);
Iface_Nb_Prims :=
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;