aboutsummaryrefslogtreecommitdiffstats
path: root/src/vhdl/vhdl-sem_lib.adb
blob: 35e92f93d7cd6fd3793f1d071b19088b9f471336 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
--  VHDL libraries handling.
--  Copyright (C) 2018 Tristan Gingold
--
--  GHDL is free software; you can redistribute it and/or modify it under
--  the terms of the GNU General Public License as published by the Free
--  Software Foundation; either version 2, or (at your option) any later
--  version.
--
--  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
--  along with GHDL; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
with Flags;
with Name_Table;
with Files_Map;
with Vhdl.Utils; use Vhdl.Utils;
with Errorout; use Errorout;
with Vhdl.Errors; use Vhdl.Errors;
with Libraries; use Libraries;
with Vhdl.Scanner;
with Vhdl.Parse;
with Vhdl.Disp_Tree;
with Vhdl.Prints;
with Vhdl.Sem;
with Vhdl.Post_Sems;
with Vhdl.Canon;
with Vhdl.Nodes_GC;

package body Vhdl.Sem_Lib is
   procedure Error_Lib_Msg (Msg : String; Arg1 : Earg_Type) is
   begin
      Report_Msg (Msgid_Error, Library, No_Source_Coord, Msg, (1 => Arg1));
   end Error_Lib_Msg;

   function Load_File (File : Source_File_Entry) return Iir_Design_File
   is
      Res : Iir_Design_File;
   begin
      Vhdl.Scanner.Set_File (File);
      if Vhdl.Scanner.Detect_Encoding_Errors then
         --  Don't even try to parse such a file.  The BOM will be interpreted
         --  as an identifier, which is not valid at the beginning of a file.
         Res := Null_Iir;
      else
         Res := Vhdl.Parse.Parse_Design_File;
      end if;
      Vhdl.Scanner.Close_File;

      if Res /= Null_Iir then
         Set_Parent (Res, Work_Library);
         Set_Design_File_Filename (Res, Files_Map.Get_File_Name (File));
         Set_Design_File_Source (Res, File);
      end if;
      return Res;
   end Load_File;

   -- parse a file.
   -- Return a design_file without putting it into the library
   -- (because it was not analyzed).
   function Load_File_Name (File_Name: Name_Id) return Iir_Design_File
   is
      Fe : Source_File_Entry;
   begin
      Fe := Files_Map.Read_Source_File (Local_Directory, File_Name);
      if Fe = No_Source_File_Entry then
         Error_Msg_Option ("cannot open " & Name_Table.Image (File_Name));
         return Null_Iir;
      end if;
      return Load_File (Fe);
   end Load_File_Name;

   procedure Finish_Compilation
     (Unit : Iir_Design_Unit; Main : Boolean := False)
   is
      Lib_Unit : Iir;
   begin
      Lib_Unit := Get_Library_Unit (Unit);
      if (Main or Flags.Dump_All) and then Flags.Dump_Parse then
         Vhdl.Disp_Tree.Disp_Tree (Unit);
      end if;

      if Flags.Check_Ast_Level > 0 then
         Vhdl.Nodes_GC.Check_Tree (Unit);
      end if;

      if Flags.Verbose then
         Report_Msg (Msgid_Note, Semantic, +Lib_Unit,
                     "analyze %n", (1 => +Lib_Unit));
      end if;

      Sem.Semantic (Unit);

      if (Main or Flags.Dump_All) and then Flags.Dump_Sem then
         Vhdl.Disp_Tree.Disp_Tree (Unit);
      end if;

      if Errorout.Nbr_Errors > 0 then
         return;
      end if;

      if (Main or Flags.List_All) and then Flags.List_Sem then
         Vhdl.Prints.Disp_Vhdl (Unit);
      end if;

      if Flags.Check_Ast_Level > 0 then
         Vhdl.Nodes_GC.Check_Tree (Unit);
      end if;

      --  Post checks
      ----------------

      Vhdl.Post_Sems.Post_Sem_Checks (Unit);

      if Errorout.Nbr_Errors > 0 then
         return;
      end if;

      --  Canonalisation.
      ------------------

      if Flags.Verbose then
         Report_Msg (Msgid_Note, Semantic, +Lib_Unit,
                     "canonicalize %n", (1 => +Lib_Unit));
      end if;

      Vhdl.Canon.Canonicalize (Unit);

      if (Main or Flags.Dump_All) and then Flags.Dump_Canon then
         Vhdl.Disp_Tree.Disp_Tree (Unit);
      end if;

      if Errorout.Nbr_Errors > 0 then
         return;
      end if;

      if (Main or Flags.List_All) and then Flags.List_Canon then
         Vhdl.Prints.Disp_Vhdl (Unit);
      end if;

      if Flags.Check_Ast_Level > 0 then
         Vhdl.Nodes_GC.Check_Tree (Unit);
      end if;
   end Finish_Compilation;

   procedure Free_Dependence_List (Design : Iir_Design_Unit)
   is
      List : Iir_List;
      It : List_Iterator;
      El : Iir;
   begin
      List := Get_Dependence_List (Design);
      if List = Null_Iir_List then
         return;
      end if;

      It := List_Iterate (List);
      while Is_Valid (It) loop
         El := Get_Element (It);
         case Get_Kind (El) is
            when Iir_Kind_Design_Unit =>
               null;
            when Iir_Kind_Entity_Aspect_Entity =>
               Free_Recursive (El);
            when others =>
               Error_Kind ("free_dependence_list", El);
         end case;
         Next (It);
      end loop;
      Destroy_Iir_List (List);
      Set_Dependence_List (Design, Null_Iir_List);
   end Free_Dependence_List;

   procedure Load_Parse_Design_Unit (Design_Unit: Iir_Design_Unit; Loc : Iir)
   is
      use Vhdl.Scanner;
      Design_File : constant Iir_Design_File := Get_Design_File (Design_Unit);
      Fe : Source_File_Entry;
      Line, Off: Natural;
      Pos: Source_Ptr;
      Res: Iir;
      Checksum : File_Checksum_Id;
   begin
      --  The unit must not be loaded.
      pragma Assert (Get_Date_State (Design_Unit) = Date_Disk);

      Fe := Get_Design_File_Source (Design_File);
      if Fe = No_Source_File_Entry then
         --  Load the file in memory.
         Fe := Files_Map.Read_Source_File
           (Get_Design_File_Directory (Design_File),
            Get_Design_File_Filename (Design_File));
         if Fe = No_Source_File_Entry then
            Error_Lib_Msg ("cannot load %n", +Get_Library_Unit (Design_Unit));
            raise Compilation_Error;
         end if;
         Set_Design_File_Source (Design_File, Fe);

         --  Check if the file has changed (but only if it has a checksum).
         Checksum := Get_File_Checksum (Design_File);
         if Checksum /= No_File_Checksum_Id
           and then
           not Files_Map.Is_Eq (Files_Map.Get_File_Checksum (Fe), Checksum)
         then
            Error_Msg_Sem (+Loc, "file %i has changed and must be reanalysed",
                           +Get_Design_File_Filename (Design_File));
            raise Compilation_Error;
         end if;
      end if;

      if Get_Date (Design_Unit) = Date_Obsolete then
         Error_Msg_Sem (+Loc, "%n has been obsoleted",
                        +Get_Library_Unit (Design_Unit));
         raise Compilation_Error;
      end if;

      --  Set the position of the lexer
      Set_File (Fe);
      Pos := Get_Design_Unit_Source_Pos (Design_Unit);
      Line := Natural (Get_Design_Unit_Source_Line (Design_Unit));
      Off := Natural (Get_Design_Unit_Source_Col (Design_Unit));
      Files_Map.File_Add_Line_Number (Get_Current_Source_File, Line, Pos);
      Set_Current_Position (Pos + Source_Ptr (Off));

      --  Parse
      Scan;
      Res := Vhdl.Parse.Parse_Design_Unit;
      Close_File;
      if Res = Null_Iir then
         raise Compilation_Error;
      end if;

      Set_Date_State (Design_Unit, Date_Parse);

      --  FIXME: check the library unit read is the one expected.

      --  Move the unit in the library: keep the design_unit of the library,
      --  but replace the library_unit by the one that has been parsed.  Do
      --  not forget to relocate parents.
      Vhdl.Utils.Free_Recursive (Get_Library_Unit (Design_Unit));
      Set_Library_Unit (Design_Unit, Get_Library_Unit (Res));
      Set_Design_Unit (Get_Library_Unit (Res), Design_Unit);
      Set_Parent (Get_Library_Unit (Res), Design_Unit);
      declare
         Item : Iir;
      begin
         Item := Get_Context_Items (Res);
         Set_Context_Items (Design_Unit, Item);
         while Is_Valid (Item) loop
            Set_Parent (Item, Design_Unit);
            Item := Get_Chain (Item);
         end loop;
      end;
      Location_Copy (Design_Unit, Res);
      Free_Dependence_List (Design_Unit);
      Set_Dependence_List (Design_Unit, Get_Dependence_List (Res));
      Set_Dependence_List (Res, Null_Iir_List);
      Free_Iir (Res);
   end Load_Parse_Design_Unit;

   procedure Error_Obsolete (Loc : Iir; Msg : String; Args : Earg_Arr) is
   begin
      if not Flags.Flag_Elaborate_With_Outdated then
         if Loc = Null_Iir then
            Error_Msg_Sem (Command_Line_Location, Msg, Args);
         else
            Error_Msg_Sem (+Loc, Msg, Args);
         end if;
      end if;
   end Error_Obsolete;

   --  Check if one of its dependency makes this unit obsolete.
   function Check_Obsolete_Dependence (Design_Unit : Iir; Loc : Iir)
                                      return Boolean
   is
      List : constant Iir_List := Get_Dependence_List (Design_Unit);
      Du_Ts : constant Time_Stamp_Id :=
        Get_Analysis_Time_Stamp (Get_Design_File (Design_Unit));
      U_Ts : Time_Stamp_Id;
      El : Iir;
      It : List_Iterator;
   begin
      if List = Null_Iir_List then
         return False;
      end if;

      It := List_Iterate (List);
      while Is_Valid (It) loop
         El := Get_Element (It);
         if Get_Kind (El) = Iir_Kind_Design_Unit then
            U_Ts := Get_Analysis_Time_Stamp (Get_Design_File (El));
            if Files_Map.Is_Gt (U_Ts, Du_Ts) then
               Error_Obsolete
                 (Loc, "%n is obsoleted by %n", (+Design_Unit, +El));
               return True;
            end if;
         end if;
         Next (It);
      end loop;

      return False;
   end Check_Obsolete_Dependence;

   procedure Explain_Obsolete (Design_Unit : Iir_Design_Unit; Loc : Iir)
   is
      List : Iir_List;
      It : List_Iterator;
      El : Iir;
   begin
      pragma Assert (Get_Date_State (Design_Unit) = Date_Analyze);
      pragma Assert (Get_Date (Design_Unit) = Date_Obsolete);

      List := Get_Dependence_List (Design_Unit);
      if List = Null_Iir_List then
         --  Argh, we don't know why.
         Error_Obsolete (Loc, "%n is obsolete", (1 => +Design_Unit));
         return;
      end if;

      It := List_Iterate (List);
      while Is_Valid (It) loop
         El := Get_Element (It);
         if Get_Date (El) = Date_Obsolete then
            Error_Obsolete (Loc, "%n is obsoleted by %n", (+Design_Unit, +El));
            return;
         end if;
         Next (It);
      end loop;
   end Explain_Obsolete;

   -- Load, parse, analyze, back-end a design_unit if necessary.
   procedure Load_Design_Unit (Design_Unit : Iir_Design_Unit; Loc : Iir)
   is
      Prev_Nbr_Errors : Natural;
      Warnings : Warnings_Setting;
   begin
      if Get_Date (Design_Unit) = Date_Replacing then
         Error_Msg_Sem (+Loc, "circular reference of %n", +Design_Unit);
         return;
      end if;

      --  Save and clear Nbr_Errors so that the unit is fully analyzed even
      --  if there were errors.
      Prev_Nbr_Errors := Errorout.Nbr_Errors;
      Errorout.Nbr_Errors := 0;

      if Get_Date_State (Design_Unit) = Date_Disk then
         Load_Parse_Design_Unit (Design_Unit, Loc);
      end if;

      if Get_Date_State (Design_Unit) = Date_Parse then
         --  Analyze the design unit.

         if Get_Date (Design_Unit) = Date_Analyzed then
            --  Work-around for an internal check in sem.
            --  FIXME: to be removed ?
            Set_Date (Design_Unit, Date_Parsed);
         end if;

         --  Avoid infinite recursion, if the unit is self-referenced.
         Set_Date_State (Design_Unit, Date_Analyze);

         --  Disable all warnings.  Warnings are emitted only when the unit
         --  is analyzed.
         Save_Warnings_Setting (Warnings);
         Disable_All_Warnings;

         --  Analyze unit.
         Finish_Compilation (Design_Unit);

         --  Restore warnings.
         Restore_Warnings_Setting (Warnings);

         --  Check if one of its dependency makes this unit obsolete.
         --  FIXME: to do when the dependency is added ?
         if not Flags.Flag_Elaborate_With_Outdated
           and then Check_Obsolete_Dependence (Design_Unit, Loc)
         then
            Set_Date (Design_Unit, Date_Obsolete);
            Errorout.Nbr_Errors := Prev_Nbr_Errors + Errorout.Nbr_Errors;
            return;
         end if;
      end if;

      --  Restore nbr_errors (accumulate).
      Errorout.Nbr_Errors := Prev_Nbr_Errors + Errorout.Nbr_Errors;

      case Get_Date (Design_Unit) is
         when Date_Parsed =>
            raise Internal_Error;
         when Date_Analyzing =>
            --  Self-referenced unit.
            return;
         when Date_Analyzed =>
            --  FIXME: Accept it silently ?
            --  Note: this is used when Flag_Elaborate_With_Outdated is set.
            --  This is also used by anonymous configuration declaration.
            null;
         when Date_Uptodate =>
            return;
         when Date_Valid =>
            null;
         when Date_Obsolete =>
            if not Flags.Flag_Elaborate_With_Outdated then
               Explain_Obsolete (Design_Unit, Loc);
            end if;
         when others =>
            raise Internal_Error;
      end case;
   end Load_Design_Unit;

   function Load_Primary_Unit
     (Library: Iir_Library_Declaration; Name: Name_Id; Loc : Iir)
      return Iir_Design_Unit
   is
      Design_Unit: Iir_Design_Unit;
   begin
      Design_Unit := Find_Primary_Unit (Library, Name);
      if Design_Unit /= Null_Iir then
         Load_Design_Unit (Design_Unit, Loc);
      end if;
      return Design_Unit;
   end Load_Primary_Unit;

   -- Load an secondary unit and analyse it.
   function Load_Secondary_Unit
     (Primary: Iir_Design_Unit; Name: Name_Id; Loc : Iir)
     return Iir_Design_Unit
   is
      Design_Unit: Iir_Design_Unit;
   begin
      Design_Unit := Find_Secondary_Unit (Primary, Name);
      if Design_Unit /= Null_Iir then
         Load_Design_Unit (Design_Unit, Loc);
      end if;
      return Design_Unit;
   end Load_Secondary_Unit;
end Vhdl.Sem_Lib;