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|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ T S S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2013, 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_Util; use Exp_Util;
with Nlists; use Nlists;
with Lib; use Lib;
with Restrict; use Restrict;
with Rident; use Rident;
with Sem_Aux; use Sem_Aux;
with Sem_Util; use Sem_Util;
with Sinfo; use Sinfo;
package body Exp_Tss is
--------------------
-- Base_Init_Proc --
--------------------
function Base_Init_Proc
(Typ : Entity_Id;
Ref : Entity_Id := Empty) return Entity_Id
is
Full_Type : E;
Proc : Entity_Id;
begin
pragma Assert (Is_Type (Typ));
if Is_Private_Type (Typ) then
Full_Type := Underlying_Type (Base_Type (Typ));
else
Full_Type := Typ;
end if;
if No (Full_Type) then
return Empty;
elsif Is_Concurrent_Type (Full_Type)
and then Present (Corresponding_Record_Type (Base_Type (Full_Type)))
then
-- The initialization routine to be called is that of the base type
-- of the corresponding record type, which may itself be a subtype
-- and possibly an itype.
return Init_Proc
(Base_Type (Corresponding_Record_Type (Base_Type (Full_Type))),
Ref);
else
Proc := Init_Proc (Base_Type (Full_Type), Ref);
if No (Proc)
and then Is_Composite_Type (Full_Type)
and then Is_Derived_Type (Full_Type)
then
return Init_Proc (Root_Type (Full_Type), Ref);
else
return Proc;
end if;
end if;
end Base_Init_Proc;
--------------
-- Copy_TSS --
--------------
-- Note: internally this routine is also used to initially set up
-- a TSS entry for a new type (case of being called from Set_TSS)
procedure Copy_TSS (TSS : Entity_Id; Typ : Entity_Id) is
FN : Node_Id;
begin
Ensure_Freeze_Node (Typ);
FN := Freeze_Node (Typ);
if No (TSS_Elist (FN)) then
Set_TSS_Elist (FN, New_Elmt_List);
end if;
-- We prepend here, so that a second call overrides the first, it
-- is not clear that this is required, but it seems reasonable.
Prepend_Elmt (TSS, TSS_Elist (FN));
end Copy_TSS;
-------------------
-- CPP_Init_Proc --
-------------------
function CPP_Init_Proc (Typ : Entity_Id) return Entity_Id is
FN : constant Node_Id := Freeze_Node (Typ);
Elmt : Elmt_Id;
begin
if not Is_CPP_Class (Root_Type (Typ))
or else No (FN)
or else No (TSS_Elist (FN))
then
return Empty;
else
Elmt := First_Elmt (TSS_Elist (FN));
while Present (Elmt) loop
if Is_CPP_Init_Proc (Node (Elmt)) then
return Node (Elmt);
end if;
Next_Elmt (Elmt);
end loop;
end if;
return Empty;
end CPP_Init_Proc;
------------------------
-- Find_Inherited_TSS --
------------------------
function Find_Inherited_TSS
(Typ : Entity_Id;
Nam : TSS_Name_Type) return Entity_Id
is
Btyp : Entity_Id := Typ;
Proc : Entity_Id;
begin
loop
Btyp := Base_Type (Btyp);
Proc := TSS (Btyp, Nam);
exit when Present (Proc)
or else not Is_Derived_Type (Btyp);
-- If Typ is a derived type, it may inherit attributes from some
-- ancestor.
Btyp := Etype (Btyp);
end loop;
if No (Proc) then
-- If nothing else, use the TSS of the root type
Proc := TSS (Base_Type (Underlying_Type (Typ)), Nam);
end if;
return Proc;
end Find_Inherited_TSS;
-----------------------
-- Get_TSS_Name_Type --
-----------------------
function Get_TSS_Name (E : Entity_Id) return TSS_Name_Type is
C1 : Character;
C2 : Character;
Nm : TSS_Name_Type;
begin
Get_Last_Two_Chars (Chars (E), C1, C2);
if C1 in 'A' .. 'Z' and then C2 in 'A' .. 'Z' then
Nm := (C1, C2);
for J in TSS_Names'Range loop
if Nm = TSS_Names (J) then
return Nm;
end if;
end loop;
end if;
return TSS_Null;
end Get_TSS_Name;
---------------------------------
-- Has_Non_Null_Base_Init_Proc --
---------------------------------
-- Note: if a base Init_Proc is present, and No_Default_Initialization is
-- present, then we must avoid testing for a null init proc, since there
-- is no init proc present in this case.
function Has_Non_Null_Base_Init_Proc (Typ : Entity_Id) return Boolean is
BIP : constant Entity_Id := Base_Init_Proc (Typ);
begin
return Present (BIP)
and then (Restriction_Active (No_Default_Initialization)
or else not Is_Null_Init_Proc (BIP));
end Has_Non_Null_Base_Init_Proc;
---------------
-- Init_Proc --
---------------
function Init_Proc
(Typ : Entity_Id;
Ref : Entity_Id := Empty) return Entity_Id
is
FN : constant Node_Id := Freeze_Node (Typ);
Elmt : Elmt_Id;
E1 : Entity_Id;
E2 : Entity_Id;
begin
if No (FN) then
return Empty;
elsif No (TSS_Elist (FN)) then
return Empty;
elsif No (Ref) then
Elmt := First_Elmt (TSS_Elist (FN));
while Present (Elmt) loop
if Is_Init_Proc (Node (Elmt)) then
if not Is_CPP_Class (Typ) then
return Node (Elmt);
-- For CPP classes, we are looking for the default constructor,
-- and so we must skip any non-default constructor.
elsif
No (Next
(First
(Parameter_Specifications (Parent (Node (Elmt))))))
then
return Node (Elmt);
end if;
end if;
Next_Elmt (Elmt);
end loop;
-- Non-default constructors are currently supported only in the context
-- of interfacing with C++.
else pragma Assert (Is_CPP_Class (Typ));
-- Use the referenced function to locate the init_proc matching
-- the C++ constructor.
Elmt := First_Elmt (TSS_Elist (FN));
while Present (Elmt) loop
if Is_Init_Proc (Node (Elmt)) then
E1 := Next_Formal (First_Formal (Node (Elmt)));
E2 := First_Formal (Ref);
while Present (E1) and then Present (E2) loop
if Chars (E1) /= Chars (E2)
or else Ekind (E1) /= Ekind (E2)
then
exit;
elsif Ekind (Etype (E1)) /= E_Anonymous_Access_Type
and then Ekind (Etype (E2)) /= E_Anonymous_Access_Type
and then Etype (E1) /= Etype (E2)
then
exit;
elsif Ekind (Etype (E1)) = E_Anonymous_Access_Type
and then Ekind (Etype (E2)) = E_Anonymous_Access_Type
and then Directly_Designated_Type (Etype (E1))
/= Directly_Designated_Type (Etype (E2))
then
exit;
end if;
E1 := Next_Formal (E1);
E2 := Next_Formal (E2);
end loop;
if No (E1) and then No (E2) then
return Node (Elmt);
end if;
end if;
Next_Elmt (Elmt);
end loop;
end if;
return Empty;
end Init_Proc;
----------------------
-- Is_CPP_Init_Proc --
----------------------
function Is_CPP_Init_Proc (E : Entity_Id) return Boolean is
C1 : Character;
C2 : Character;
begin
Get_Last_Two_Chars (Chars (E), C1, C2);
return C1 = TSS_CPP_Init_Proc (1) and then C2 = TSS_CPP_Init_Proc (2);
end Is_CPP_Init_Proc;
------------------
-- Is_Init_Proc --
------------------
function Is_Init_Proc (E : Entity_Id) return Boolean is
C1 : Character;
C2 : Character;
begin
Get_Last_Two_Chars (Chars (E), C1, C2);
return C1 = TSS_Init_Proc (1) and then C2 = TSS_Init_Proc (2);
end Is_Init_Proc;
------------
-- Is_TSS --
------------
function Is_TSS (E : Entity_Id; Nam : TSS_Name_Type) return Boolean is
C1 : Character;
C2 : Character;
begin
Get_Last_Two_Chars (Chars (E), C1, C2);
return C1 = Nam (1) and then C2 = Nam (2);
end Is_TSS;
function Is_TSS (N : Name_Id; Nam : TSS_Name_Type) return Boolean is
C1 : Character;
C2 : Character;
begin
Get_Last_Two_Chars (N, C1, C2);
return C1 = Nam (1) and then C2 = Nam (2);
end Is_TSS;
-------------------------
-- Make_Init_Proc_Name --
-------------------------
function Make_Init_Proc_Name (Typ : Entity_Id) return Name_Id is
begin
return Make_TSS_Name (Typ, TSS_Init_Proc);
end Make_Init_Proc_Name;
-------------------
-- Make_TSS_Name --
-------------------
function Make_TSS_Name
(Typ : Entity_Id;
Nam : TSS_Name_Type) return Name_Id
is
begin
Get_Name_String (Chars (Typ));
Add_Char_To_Name_Buffer (Nam (1));
Add_Char_To_Name_Buffer (Nam (2));
return Name_Find;
end Make_TSS_Name;
-------------------------
-- Make_TSS_Name_Local --
-------------------------
function Make_TSS_Name_Local
(Typ : Entity_Id;
Nam : TSS_Name_Type) return Name_Id
is
begin
Get_Name_String (Chars (Typ));
Add_Char_To_Name_Buffer ('_');
Add_Nat_To_Name_Buffer (Increment_Serial_Number);
Add_Char_To_Name_Buffer (Nam (1));
Add_Char_To_Name_Buffer (Nam (2));
return Name_Find;
end Make_TSS_Name_Local;
--------------
-- Same_TSS --
--------------
function Same_TSS (E1, E2 : Entity_Id) return Boolean is
E1C1 : Character;
E1C2 : Character;
E2C1 : Character;
E2C2 : Character;
begin
Get_Last_Two_Chars (Chars (E1), E1C1, E1C2);
Get_Last_Two_Chars (Chars (E2), E2C1, E2C2);
return
E1C1 = E2C1
and then
E1C2 = E2C2
and then
E1C1 in 'A' .. 'Z'
and then
E1C2 in 'A' .. 'Z';
end Same_TSS;
-------------------
-- Set_Init_Proc --
-------------------
procedure Set_Init_Proc (Typ : Entity_Id; Init : Entity_Id) is
begin
Set_TSS (Typ, Init);
end Set_Init_Proc;
-------------
-- Set_TSS --
-------------
procedure Set_TSS (Typ : Entity_Id; TSS : Entity_Id) is
begin
-- Make sure body of subprogram is frozen
-- Skip this for Init_Proc with No_Default_Initialization, since the
-- Init proc is a dummy void entity in this case to be ignored.
if (Is_Init_Proc (TSS) or else Is_CPP_Init_Proc (TSS))
and then Restriction_Active (No_Default_Initialization)
then
null;
-- Skip this if not in the same code unit (since it means we are using
-- an already existing TSS in another unit)
elsif not In_Same_Code_Unit (Typ, TSS) then
null;
-- Otherwise make sure body is frozen
else
Append_Freeze_Action (Typ, Unit_Declaration_Node (TSS));
end if;
-- Set TSS entry
Copy_TSS (TSS, Typ);
end Set_TSS;
---------
-- TSS --
---------
function TSS (Typ : Entity_Id; Nam : TSS_Name_Type) return Entity_Id is
FN : constant Node_Id := Freeze_Node (Typ);
Elmt : Elmt_Id;
Subp : Entity_Id;
begin
if No (FN) then
return Empty;
elsif No (TSS_Elist (FN)) then
return Empty;
else
Elmt := First_Elmt (TSS_Elist (FN));
while Present (Elmt) loop
if Is_TSS (Node (Elmt), Nam) then
Subp := Node (Elmt);
-- For stream subprograms, the TSS entity may be a renaming-
-- as-body of an already generated entity. Use that one rather
-- the one introduced by the renaming, which is an artifact of
-- current stream handling.
if Nkind (Parent (Parent (Subp))) =
N_Subprogram_Renaming_Declaration
and then
Present (Corresponding_Spec (Parent (Parent (Subp))))
then
return Corresponding_Spec (Parent (Parent (Subp)));
else
return Subp;
end if;
else
Next_Elmt (Elmt);
end if;
end loop;
end if;
return Empty;
end TSS;
function TSS (Typ : Entity_Id; Nam : Name_Id) return Entity_Id is
FN : constant Node_Id := Freeze_Node (Typ);
Elmt : Elmt_Id;
Subp : Entity_Id;
begin
if No (FN) then
return Empty;
elsif No (TSS_Elist (FN)) then
return Empty;
else
Elmt := First_Elmt (TSS_Elist (FN));
while Present (Elmt) loop
if Chars (Node (Elmt)) = Nam then
Subp := Node (Elmt);
-- For stream subprograms, the TSS entity may be a renaming-
-- as-body of an already generated entity. Use that one rather
-- the one introduced by the renaming, which is an artifact of
-- current stream handling.
if Nkind (Parent (Parent (Subp))) =
N_Subprogram_Renaming_Declaration
and then
Present (Corresponding_Spec (Parent (Parent (Subp))))
then
return Corresponding_Spec (Parent (Parent (Subp)));
else
return Subp;
end if;
else
Next_Elmt (Elmt);
end if;
end loop;
end if;
return Empty;
end TSS;
end Exp_Tss;
|
