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 return Init_Proc (Corresponding_Record_Type (Base_Type (Full_Type)));
63 Proc := Init_Proc (Base_Type (Full_Type));
66 and then Is_Composite_Type (Full_Type)
67 and then Is_Derived_Type (Full_Type)
69 return Init_Proc (Root_Type (Full_Type));
80 -- Note: internally this routine is also used to initially set up
81 -- a TSS entry for a new type (case of being called from Set_TSS)
83 procedure Copy_TSS (TSS : Entity_Id; Typ : Entity_Id) is
87 Ensure_Freeze_Node (Typ);
88 FN := Freeze_Node (Typ);
90 if No (TSS_Elist (FN)) then
91 Set_TSS_Elist (FN, New_Elmt_List);
94 -- We prepend here, so that a second call overrides the first, it
95 -- is not clear that this is required, but it seems reasonable.
97 Prepend_Elmt (TSS, TSS_Elist (FN));
100 ------------------------
101 -- Find_Inherited_TSS --
102 ------------------------
104 function Find_Inherited_TSS
106 Nam : TSS_Name_Type) return Entity_Id
108 Btyp : Entity_Id := Typ;
113 Btyp := Base_Type (Btyp);
114 Proc := TSS (Btyp, Nam);
116 exit when Present (Proc)
117 or else not Is_Derived_Type (Btyp);
119 -- If Typ is a derived type, it may inherit attributes from some
122 Btyp := Etype (Btyp);
127 -- If nothing else, use the TSS of the root type
129 Proc := TSS (Base_Type (Underlying_Type (Typ)), Nam);
133 end Find_Inherited_TSS;
135 -----------------------
136 -- Get_TSS_Name_Type --
137 -----------------------
139 function Get_TSS_Name (E : Entity_Id) return TSS_Name_Type is
145 Get_Last_Two_Chars (Chars (E), C1, C2);
147 if C1 in 'A' .. 'Z' and then C2 in 'A' .. 'Z' then
150 for J in TSS_Names'Range loop
151 if Nm = TSS_Names (J) then
160 ---------------------------------
161 -- Has_Non_Null_Base_Init_Proc --
162 ---------------------------------
164 -- Note: if a base Init_Proc is present, and No_Default_Initialization is
165 -- present, then we must avoid testing for a null init proc, since there
166 -- is no init proc present in this case.
168 function Has_Non_Null_Base_Init_Proc (Typ : Entity_Id) return Boolean is
169 BIP : constant Entity_Id := Base_Init_Proc (Typ);
172 and then (Restriction_Active (No_Default_Initialization)
173 or else not Is_Null_Init_Proc (BIP));
174 end Has_Non_Null_Base_Init_Proc;
180 function Init_Proc (Typ : Entity_Id) return Entity_Id is
181 FN : constant Node_Id := Freeze_Node (Typ);
188 elsif No (TSS_Elist (FN)) then
192 Elmt := First_Elmt (TSS_Elist (FN));
193 while Present (Elmt) loop
194 if Is_Init_Proc (Node (Elmt)) then
209 function Is_Init_Proc (E : Entity_Id) return Boolean is
213 Get_Last_Two_Chars (Chars (E), C1, C2);
214 return C1 = TSS_Init_Proc (1) and then C2 = TSS_Init_Proc (2);
221 function Is_TSS (E : Entity_Id; Nam : TSS_Name_Type) return Boolean is
225 Get_Last_Two_Chars (Chars (E), C1, C2);
226 return C1 = Nam (1) and then C2 = Nam (2);
229 function Is_TSS (N : Name_Id; Nam : TSS_Name_Type) return Boolean is
233 Get_Last_Two_Chars (N, C1, C2);
234 return C1 = Nam (1) and then C2 = Nam (2);
237 -------------------------
238 -- Make_Init_Proc_Name --
239 -------------------------
241 function Make_Init_Proc_Name (Typ : Entity_Id) return Name_Id is
243 return Make_TSS_Name (Typ, TSS_Init_Proc);
244 end Make_Init_Proc_Name;
250 function Make_TSS_Name
252 Nam : TSS_Name_Type) return Name_Id
255 Get_Name_String (Chars (Typ));
256 Add_Char_To_Name_Buffer (Nam (1));
257 Add_Char_To_Name_Buffer (Nam (2));
261 -------------------------
262 -- Make_TSS_Name_Local --
263 -------------------------
265 function Make_TSS_Name_Local
267 Nam : TSS_Name_Type) return Name_Id
270 Get_Name_String (Chars (Typ));
271 Add_Char_To_Name_Buffer ('_');
272 Add_Nat_To_Name_Buffer (Increment_Serial_Number);
273 Add_Char_To_Name_Buffer (Nam (1));
274 Add_Char_To_Name_Buffer (Nam (2));
276 end Make_TSS_Name_Local;
282 function Same_TSS (E1, E2 : Entity_Id) return Boolean is
289 Get_Last_Two_Chars (Chars (E1), E1C1, E1C2);
290 Get_Last_Two_Chars (Chars (E2), E2C1, E2C2);
306 procedure Set_Init_Proc (Typ : Entity_Id; Init : Entity_Id) is
315 procedure Set_TSS (Typ : Entity_Id; TSS : Entity_Id) is
317 -- Make sure body of subprogram is frozen
319 -- Skip this for Init_Proc with No_Default_Initialization, since the
320 -- Init proc is a dummy void entity in this case to be ignored.
322 if Is_Init_Proc (TSS)
323 and then Restriction_Active (No_Default_Initialization)
327 -- Skip this if not in the same code unit (since it means we are using
328 -- an already existing TSS in another unit)
330 elsif not In_Same_Code_Unit (Typ, TSS) then
333 -- Otherwise make sure body is frozen
336 Append_Freeze_Action (Typ, Unit_Declaration_Node (TSS));
348 function TSS (Typ : Entity_Id; Nam : TSS_Name_Type) return Entity_Id is
349 FN : constant Node_Id := Freeze_Node (Typ);
357 elsif No (TSS_Elist (FN)) then
361 Elmt := First_Elmt (TSS_Elist (FN));
362 while Present (Elmt) loop
363 if Is_TSS (Node (Elmt), Nam) then
366 -- For stream subprograms, the TSS entity may be a renaming-
367 -- as-body of an already generated entity. Use that one rather
368 -- the one introduced by the renaming, which is an artifact of
369 -- current stream handling.
371 if Nkind (Parent (Parent (Subp))) =
372 N_Subprogram_Renaming_Declaration
374 Present (Corresponding_Spec (Parent (Parent (Subp))))
376 return Corresponding_Spec (Parent (Parent (Subp)));
390 function TSS (Typ : Entity_Id; Nam : Name_Id) return Entity_Id is
391 FN : constant Node_Id := Freeze_Node (Typ);
399 elsif No (TSS_Elist (FN)) then
403 Elmt := First_Elmt (TSS_Elist (FN));
404 while Present (Elmt) loop
405 if Chars (Node (Elmt)) = Nam then
408 -- For stream subprograms, the TSS entity may be a renaming-
409 -- as-body of an already generated entity. Use that one rather
410 -- the one introduced by the renaming, which is an artifact of
411 -- current stream handling.
413 if Nkind (Parent (Parent (Subp))) =
414 N_Subprogram_Renaming_Declaration
416 Present (Corresponding_Spec (Parent (Parent (Subp))))
418 return Corresponding_Spec (Parent (Parent (Subp)));