1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Einfo; use Einfo;
28 with Elists; use Elists;
29 with Exp_Util; use Exp_Util;
30 with Nlists; use Nlists;
32 with Restrict; use Restrict;
33 with Rident; use Rident;
34 with Sem_Aux; use Sem_Aux;
35 with Sem_Util; use Sem_Util;
36 with Sinfo; use Sinfo;
38 package body Exp_Tss is
44 function Base_Init_Proc
46 Ref : Entity_Id := Empty) return Entity_Id
52 pragma Assert (Is_Type (Typ));
54 if Is_Private_Type (Typ) then
55 Full_Type := Underlying_Type (Base_Type (Typ));
60 if No (Full_Type) then
63 elsif Is_Concurrent_Type (Full_Type)
64 and then Present (Corresponding_Record_Type (Base_Type (Full_Type)))
66 -- The initialization routine to be called is that of the base type
67 -- of the corresponding record type, which may itself be a subtype
68 -- and possibly an itype.
71 (Base_Type (Corresponding_Record_Type (Base_Type (Full_Type))),
75 Proc := Init_Proc (Base_Type (Full_Type), Ref);
78 and then Is_Composite_Type (Full_Type)
79 and then Is_Derived_Type (Full_Type)
81 return Init_Proc (Root_Type (Full_Type), Ref);
92 -- Note: internally this routine is also used to initially set up
93 -- a TSS entry for a new type (case of being called from Set_TSS)
95 procedure Copy_TSS (TSS : Entity_Id; Typ : Entity_Id) is
99 Ensure_Freeze_Node (Typ);
100 FN := Freeze_Node (Typ);
102 if No (TSS_Elist (FN)) then
103 Set_TSS_Elist (FN, New_Elmt_List);
106 -- We prepend here, so that a second call overrides the first, it
107 -- is not clear that this is required, but it seems reasonable.
109 Prepend_Elmt (TSS, TSS_Elist (FN));
116 function CPP_Init_Proc (Typ : Entity_Id) return Entity_Id is
117 FN : constant Node_Id := Freeze_Node (Typ);
121 if not Is_CPP_Class (Root_Type (Typ))
123 or else No (TSS_Elist (FN))
128 Elmt := First_Elmt (TSS_Elist (FN));
129 while Present (Elmt) loop
130 if Is_CPP_Init_Proc (Node (Elmt)) then
141 ------------------------
142 -- Find_Inherited_TSS --
143 ------------------------
145 function Find_Inherited_TSS
147 Nam : TSS_Name_Type) return Entity_Id
149 Btyp : Entity_Id := Typ;
154 Btyp := Base_Type (Btyp);
155 Proc := TSS (Btyp, Nam);
157 exit when Present (Proc)
158 or else not Is_Derived_Type (Btyp);
160 -- If Typ is a derived type, it may inherit attributes from some
163 Btyp := Etype (Btyp);
168 -- If nothing else, use the TSS of the root type
170 Proc := TSS (Base_Type (Underlying_Type (Typ)), Nam);
174 end Find_Inherited_TSS;
176 -----------------------
177 -- Get_TSS_Name_Type --
178 -----------------------
180 function Get_TSS_Name (E : Entity_Id) return TSS_Name_Type is
186 Get_Last_Two_Chars (Chars (E), C1, C2);
188 if C1 in 'A' .. 'Z' and then C2 in 'A' .. 'Z' then
191 for J in TSS_Names'Range loop
192 if Nm = TSS_Names (J) then
201 ---------------------------------
202 -- Has_Non_Null_Base_Init_Proc --
203 ---------------------------------
205 -- Note: if a base Init_Proc is present, and No_Default_Initialization is
206 -- present, then we must avoid testing for a null init proc, since there
207 -- is no init proc present in this case.
209 function Has_Non_Null_Base_Init_Proc (Typ : Entity_Id) return Boolean is
210 BIP : constant Entity_Id := Base_Init_Proc (Typ);
213 and then (Restriction_Active (No_Default_Initialization)
214 or else not Is_Null_Init_Proc (BIP));
215 end Has_Non_Null_Base_Init_Proc;
223 Ref : Entity_Id := Empty) return Entity_Id
225 FN : constant Node_Id := Freeze_Node (Typ);
234 elsif No (TSS_Elist (FN)) then
238 Elmt := First_Elmt (TSS_Elist (FN));
239 while Present (Elmt) loop
240 if Is_Init_Proc (Node (Elmt)) then
241 if not Is_CPP_Class (Typ) then
244 -- For CPP classes, we are looking for the default constructor,
245 -- and so we must skip any non-default constructor.
250 (Parameter_Specifications (Parent (Node (Elmt))))))
259 -- Non-default constructors are currently supported only in the context
260 -- of interfacing with C++.
262 else pragma Assert (Is_CPP_Class (Typ));
264 -- Use the referenced function to locate the init_proc matching
265 -- the C++ constructor.
267 Elmt := First_Elmt (TSS_Elist (FN));
268 while Present (Elmt) loop
269 if Is_Init_Proc (Node (Elmt)) then
270 E1 := Next_Formal (First_Formal (Node (Elmt)));
271 E2 := First_Formal (Ref);
272 while Present (E1) and then Present (E2) loop
273 if Chars (E1) /= Chars (E2)
274 or else Ekind (E1) /= Ekind (E2)
278 elsif Ekind (Etype (E1)) /= E_Anonymous_Access_Type
279 and then Ekind (Etype (E2)) /= E_Anonymous_Access_Type
280 and then Etype (E1) /= Etype (E2)
284 elsif Ekind (Etype (E1)) = E_Anonymous_Access_Type
285 and then Ekind (Etype (E2)) = E_Anonymous_Access_Type
286 and then Directly_Designated_Type (Etype (E1))
287 /= Directly_Designated_Type (Etype (E2))
292 E1 := Next_Formal (E1);
293 E2 := Next_Formal (E2);
296 if No (E1) and then No (E2) then
308 ----------------------
309 -- Is_CPP_Init_Proc --
310 ----------------------
312 function Is_CPP_Init_Proc (E : Entity_Id) return Boolean is
316 Get_Last_Two_Chars (Chars (E), C1, C2);
317 return C1 = TSS_CPP_Init_Proc (1) and then C2 = TSS_CPP_Init_Proc (2);
318 end Is_CPP_Init_Proc;
324 function Is_Init_Proc (E : Entity_Id) return Boolean is
328 Get_Last_Two_Chars (Chars (E), C1, C2);
329 return C1 = TSS_Init_Proc (1) and then C2 = TSS_Init_Proc (2);
336 function Is_TSS (E : Entity_Id; Nam : TSS_Name_Type) return Boolean is
340 Get_Last_Two_Chars (Chars (E), C1, C2);
341 return C1 = Nam (1) and then C2 = Nam (2);
344 function Is_TSS (N : Name_Id; Nam : TSS_Name_Type) return Boolean is
348 Get_Last_Two_Chars (N, C1, C2);
349 return C1 = Nam (1) and then C2 = Nam (2);
352 -------------------------
353 -- Make_Init_Proc_Name --
354 -------------------------
356 function Make_Init_Proc_Name (Typ : Entity_Id) return Name_Id is
358 return Make_TSS_Name (Typ, TSS_Init_Proc);
359 end Make_Init_Proc_Name;
365 function Make_TSS_Name
367 Nam : TSS_Name_Type) return Name_Id
370 Get_Name_String (Chars (Typ));
371 Add_Char_To_Name_Buffer (Nam (1));
372 Add_Char_To_Name_Buffer (Nam (2));
376 -------------------------
377 -- Make_TSS_Name_Local --
378 -------------------------
380 function Make_TSS_Name_Local
382 Nam : TSS_Name_Type) return Name_Id
385 Get_Name_String (Chars (Typ));
386 Add_Char_To_Name_Buffer ('_');
387 Add_Nat_To_Name_Buffer (Increment_Serial_Number);
388 Add_Char_To_Name_Buffer (Nam (1));
389 Add_Char_To_Name_Buffer (Nam (2));
391 end Make_TSS_Name_Local;
397 function Same_TSS (E1, E2 : Entity_Id) return Boolean is
404 Get_Last_Two_Chars (Chars (E1), E1C1, E1C2);
405 Get_Last_Two_Chars (Chars (E2), E2C1, E2C2);
421 procedure Set_Init_Proc (Typ : Entity_Id; Init : Entity_Id) is
430 procedure Set_TSS (Typ : Entity_Id; TSS : Entity_Id) is
432 -- Make sure body of subprogram is frozen
434 -- Skip this for Init_Proc with No_Default_Initialization, since the
435 -- Init proc is a dummy void entity in this case to be ignored.
437 if (Is_Init_Proc (TSS) or else Is_CPP_Init_Proc (TSS))
438 and then Restriction_Active (No_Default_Initialization)
442 -- Skip this if not in the same code unit (since it means we are using
443 -- an already existing TSS in another unit)
445 elsif not In_Same_Code_Unit (Typ, TSS) then
448 -- Otherwise make sure body is frozen
451 Append_Freeze_Action (Typ, Unit_Declaration_Node (TSS));
463 function TSS (Typ : Entity_Id; Nam : TSS_Name_Type) return Entity_Id is
464 FN : constant Node_Id := Freeze_Node (Typ);
472 elsif No (TSS_Elist (FN)) then
476 Elmt := First_Elmt (TSS_Elist (FN));
477 while Present (Elmt) loop
478 if Is_TSS (Node (Elmt), Nam) then
481 -- For stream subprograms, the TSS entity may be a renaming-
482 -- as-body of an already generated entity. Use that one rather
483 -- the one introduced by the renaming, which is an artifact of
484 -- current stream handling.
486 if Nkind (Parent (Parent (Subp))) =
487 N_Subprogram_Renaming_Declaration
489 Present (Corresponding_Spec (Parent (Parent (Subp))))
491 return Corresponding_Spec (Parent (Parent (Subp)));
505 function TSS (Typ : Entity_Id; Nam : Name_Id) return Entity_Id is
506 FN : constant Node_Id := Freeze_Node (Typ);
514 elsif No (TSS_Elist (FN)) then
518 Elmt := First_Elmt (TSS_Elist (FN));
519 while Present (Elmt) loop
520 if Chars (Node (Elmt)) = Nam then
523 -- For stream subprograms, the TSS entity may be a renaming-
524 -- as-body of an already generated entity. Use that one rather
525 -- the one introduced by the renaming, which is an artifact of
526 -- current stream handling.
528 if Nkind (Parent (Parent (Subp))) =
529 N_Subprogram_Renaming_Declaration
531 Present (Corresponding_Spec (Parent (Parent (Subp))))
533 return Corresponding_Spec (Parent (Parent (Subp)));