1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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;
31 with Restrict; use Restrict;
32 with Rident; use Rident;
33 with Sem_Util; use Sem_Util;
34 with Sinfo; use Sinfo;
36 package body Exp_Tss is
42 function Base_Init_Proc (Typ : Entity_Id) return Entity_Id is
47 pragma Assert (Is_Type (Typ));
49 if Is_Private_Type (Typ) then
50 Full_Type := Underlying_Type (Base_Type (Typ));
55 if No (Full_Type) then
57 elsif Is_Concurrent_Type (Full_Type)
58 and then Present (Corresponding_Record_Type (Base_Type (Full_Type)))
60 -- The initialization routine to be called is that of the base type
61 -- of the corresponding record type, which may itself be a subtype
62 -- and possibly an itype.
65 (Base_Type (Corresponding_Record_Type (Base_Type (Full_Type))));
68 Proc := Init_Proc (Base_Type (Full_Type));
71 and then Is_Composite_Type (Full_Type)
72 and then Is_Derived_Type (Full_Type)
74 return Init_Proc (Root_Type (Full_Type));
85 -- Note: internally this routine is also used to initially set up
86 -- a TSS entry for a new type (case of being called from Set_TSS)
88 procedure Copy_TSS (TSS : Entity_Id; Typ : Entity_Id) is
92 Ensure_Freeze_Node (Typ);
93 FN := Freeze_Node (Typ);
95 if No (TSS_Elist (FN)) then
96 Set_TSS_Elist (FN, New_Elmt_List);
99 -- We prepend here, so that a second call overrides the first, it
100 -- is not clear that this is required, but it seems reasonable.
102 Prepend_Elmt (TSS, TSS_Elist (FN));
105 ------------------------
106 -- Find_Inherited_TSS --
107 ------------------------
109 function Find_Inherited_TSS
111 Nam : TSS_Name_Type) return Entity_Id
113 Btyp : Entity_Id := Typ;
118 Btyp := Base_Type (Btyp);
119 Proc := TSS (Btyp, Nam);
121 exit when Present (Proc)
122 or else not Is_Derived_Type (Btyp);
124 -- If Typ is a derived type, it may inherit attributes from some
127 Btyp := Etype (Btyp);
132 -- If nothing else, use the TSS of the root type
134 Proc := TSS (Base_Type (Underlying_Type (Typ)), Nam);
138 end Find_Inherited_TSS;
140 -----------------------
141 -- Get_TSS_Name_Type --
142 -----------------------
144 function Get_TSS_Name (E : Entity_Id) return TSS_Name_Type is
150 Get_Last_Two_Chars (Chars (E), C1, C2);
152 if C1 in 'A' .. 'Z' and then C2 in 'A' .. 'Z' then
155 for J in TSS_Names'Range loop
156 if Nm = TSS_Names (J) then
165 ---------------------------------
166 -- Has_Non_Null_Base_Init_Proc --
167 ---------------------------------
169 -- Note: if a base Init_Proc is present, and No_Default_Initialization is
170 -- present, then we must avoid testing for a null init proc, since there
171 -- is no init proc present in this case.
173 function Has_Non_Null_Base_Init_Proc (Typ : Entity_Id) return Boolean is
174 BIP : constant Entity_Id := Base_Init_Proc (Typ);
177 and then (Restriction_Active (No_Default_Initialization)
178 or else not Is_Null_Init_Proc (BIP));
179 end Has_Non_Null_Base_Init_Proc;
185 function Init_Proc (Typ : Entity_Id) return Entity_Id is
186 FN : constant Node_Id := Freeze_Node (Typ);
193 elsif No (TSS_Elist (FN)) then
197 Elmt := First_Elmt (TSS_Elist (FN));
198 while Present (Elmt) loop
199 if Is_Init_Proc (Node (Elmt)) then
214 function Is_Init_Proc (E : Entity_Id) return Boolean is
218 Get_Last_Two_Chars (Chars (E), C1, C2);
219 return C1 = TSS_Init_Proc (1) and then C2 = TSS_Init_Proc (2);
226 function Is_TSS (E : Entity_Id; Nam : TSS_Name_Type) return Boolean is
230 Get_Last_Two_Chars (Chars (E), C1, C2);
231 return C1 = Nam (1) and then C2 = Nam (2);
234 function Is_TSS (N : Name_Id; Nam : TSS_Name_Type) return Boolean is
238 Get_Last_Two_Chars (N, C1, C2);
239 return C1 = Nam (1) and then C2 = Nam (2);
242 -------------------------
243 -- Make_Init_Proc_Name --
244 -------------------------
246 function Make_Init_Proc_Name (Typ : Entity_Id) return Name_Id is
248 return Make_TSS_Name (Typ, TSS_Init_Proc);
249 end Make_Init_Proc_Name;
255 function Make_TSS_Name
257 Nam : TSS_Name_Type) return Name_Id
260 Get_Name_String (Chars (Typ));
261 Add_Char_To_Name_Buffer (Nam (1));
262 Add_Char_To_Name_Buffer (Nam (2));
266 -------------------------
267 -- Make_TSS_Name_Local --
268 -------------------------
270 function Make_TSS_Name_Local
272 Nam : TSS_Name_Type) return Name_Id
275 Get_Name_String (Chars (Typ));
276 Add_Char_To_Name_Buffer ('_');
277 Add_Nat_To_Name_Buffer (Increment_Serial_Number);
278 Add_Char_To_Name_Buffer (Nam (1));
279 Add_Char_To_Name_Buffer (Nam (2));
281 end Make_TSS_Name_Local;
287 function Same_TSS (E1, E2 : Entity_Id) return Boolean is
294 Get_Last_Two_Chars (Chars (E1), E1C1, E1C2);
295 Get_Last_Two_Chars (Chars (E2), E2C1, E2C2);
311 procedure Set_Init_Proc (Typ : Entity_Id; Init : Entity_Id) is
320 procedure Set_TSS (Typ : Entity_Id; TSS : Entity_Id) is
322 -- Make sure body of subprogram is frozen
324 -- Skip this for Init_Proc with No_Default_Initialization, since the
325 -- Init proc is a dummy void entity in this case to be ignored.
327 if Is_Init_Proc (TSS)
328 and then Restriction_Active (No_Default_Initialization)
332 -- Skip this if not in the same code unit (since it means we are using
333 -- an already existing TSS in another unit)
335 elsif not In_Same_Code_Unit (Typ, TSS) then
338 -- Otherwise make sure body is frozen
341 Append_Freeze_Action (Typ, Unit_Declaration_Node (TSS));
353 function TSS (Typ : Entity_Id; Nam : TSS_Name_Type) return Entity_Id is
354 FN : constant Node_Id := Freeze_Node (Typ);
362 elsif No (TSS_Elist (FN)) then
366 Elmt := First_Elmt (TSS_Elist (FN));
367 while Present (Elmt) loop
368 if Is_TSS (Node (Elmt), Nam) then
371 -- For stream subprograms, the TSS entity may be a renaming-
372 -- as-body of an already generated entity. Use that one rather
373 -- the one introduced by the renaming, which is an artifact of
374 -- current stream handling.
376 if Nkind (Parent (Parent (Subp))) =
377 N_Subprogram_Renaming_Declaration
379 Present (Corresponding_Spec (Parent (Parent (Subp))))
381 return Corresponding_Spec (Parent (Parent (Subp)));
395 function TSS (Typ : Entity_Id; Nam : Name_Id) return Entity_Id is
396 FN : constant Node_Id := Freeze_Node (Typ);
404 elsif No (TSS_Elist (FN)) then
408 Elmt := First_Elmt (TSS_Elist (FN));
409 while Present (Elmt) loop
410 if Chars (Node (Elmt)) = Nam then
413 -- For stream subprograms, the TSS entity may be a renaming-
414 -- as-body of an already generated entity. Use that one rather
415 -- the one introduced by the renaming, which is an artifact of
416 -- current stream handling.
418 if Nkind (Parent (Parent (Subp))) =
419 N_Subprogram_Renaming_Declaration
421 Present (Corresponding_Spec (Parent (Parent (Subp))))
423 return Corresponding_Spec (Parent (Parent (Subp)));