summaryrefslogtreecommitdiff
path: root/gcc/ada/fmap.adb
blob: 171f7a18e7d1eb5e1eadf1b7ffbbf59ec2b76ba8 (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
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                                 F M A P                                  --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 2001-2010, 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 Opt;    use Opt;
with Osint;  use Osint;
with Output; use Output;
with Table;
with Types;  use Types;

pragma Warnings (Off);
--  This package is used also by gnatcoll
with System.OS_Lib; use System.OS_Lib;
pragma Warnings (On);

with Unchecked_Conversion;

with GNAT.HTable;

package body Fmap is

   No_Mapping_File : Boolean := False;
   --  Set to True when the specified mapping file cannot be read in
   --  procedure Initialize, so that no attempt is made to open the mapping
   --  file in procedure Update_Mapping_File.

   function To_Big_String_Ptr is new Unchecked_Conversion
     (Source_Buffer_Ptr, Big_String_Ptr);

   Max_Buffer : constant := 1_500;
   Buffer : String (1 .. Max_Buffer);
   --  Used to bufferize output when writing to a new mapping file

   Buffer_Last : Natural := 0;
   --  Index of last valid character in Buffer

   type Mapping is record
      Uname : Unit_Name_Type;
      Fname : File_Name_Type;
   end record;

   package File_Mapping is new Table.Table (
     Table_Component_Type => Mapping,
     Table_Index_Type     => Int,
     Table_Low_Bound      => 0,
     Table_Initial        => 1_000,
     Table_Increment      => 1_000,
     Table_Name           => "Fmap.File_Mapping");
   --  Mapping table to map unit names to file names

   package Path_Mapping is new Table.Table (
     Table_Component_Type => Mapping,
     Table_Index_Type     => Int,
     Table_Low_Bound      => 0,
     Table_Initial        => 1_000,
     Table_Increment      => 1_000,
     Table_Name           => "Fmap.Path_Mapping");
   --  Mapping table to map file names to path names

   type Header_Num is range 0 .. 1_000;

   function Hash (F : Unit_Name_Type) return Header_Num;
   --  Function used to compute hash of unit name

   No_Entry : constant Int := -1;
   --  Signals no entry in following table

   package Unit_Hash_Table is new GNAT.HTable.Simple_HTable (
     Header_Num => Header_Num,
     Element    => Int,
     No_Element => No_Entry,
     Key        => Unit_Name_Type,
     Hash       => Hash,
     Equal      => "=");
   --  Hash table to map unit names to file names. Used in conjunction with
   --  table File_Mapping above.

   function Hash (F : File_Name_Type) return Header_Num;
   --  Function used to compute hash of file name

   package File_Hash_Table is new GNAT.HTable.Simple_HTable (
     Header_Num => Header_Num,
     Element    => Int,
     No_Element => No_Entry,
     Key        => File_Name_Type,
     Hash       => Hash,
     Equal      => "=");
   --  Hash table to map file names to path names. Used in conjunction with
   --  table Path_Mapping above.

   Last_In_Table : Int := 0;

   package Forbidden_Names is new GNAT.HTable.Simple_HTable (
     Header_Num => Header_Num,
     Element    => Boolean,
     No_Element => False,
     Key        => File_Name_Type,
     Hash       => Hash,
     Equal      => "=");

   -----------------------------
   -- Add_Forbidden_File_Name --
   -----------------------------

   procedure Add_Forbidden_File_Name (Name : File_Name_Type) is
   begin
      Forbidden_Names.Set (Name, True);
   end Add_Forbidden_File_Name;

   ---------------------
   -- Add_To_File_Map --
   ---------------------

   procedure Add_To_File_Map
     (Unit_Name : Unit_Name_Type;
      File_Name : File_Name_Type;
      Path_Name : File_Name_Type)
   is
      Unit_Entry : constant Int := Unit_Hash_Table.Get (Unit_Name);
      File_Entry : constant Int := File_Hash_Table.Get (File_Name);
   begin
      if Unit_Entry = No_Entry or else
        File_Mapping.Table (Unit_Entry).Fname /= File_Name
      then
         File_Mapping.Increment_Last;
         Unit_Hash_Table.Set (Unit_Name, File_Mapping.Last);
         File_Mapping.Table (File_Mapping.Last) :=
           (Uname => Unit_Name, Fname => File_Name);
      end if;

      if File_Entry = No_Entry or else
        Path_Mapping.Table (File_Entry).Fname /= Path_Name
      then
         Path_Mapping.Increment_Last;
         File_Hash_Table.Set (File_Name, Path_Mapping.Last);
         Path_Mapping.Table (Path_Mapping.Last) :=
           (Uname => Unit_Name, Fname => Path_Name);
      end if;
   end Add_To_File_Map;

   ----------
   -- Hash --
   ----------

   function Hash (F : File_Name_Type) return Header_Num is
   begin
      return Header_Num (Int (F) rem Header_Num'Range_Length);
   end Hash;

   function Hash (F : Unit_Name_Type) return Header_Num is
   begin
      return Header_Num (Int (F) rem Header_Num'Range_Length);
   end Hash;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize (File_Name : String) is
      Src : Source_Buffer_Ptr;
      Hi  : Source_Ptr;
      BS  : Big_String_Ptr;
      SP  : String_Ptr;

      First : Positive := 1;
      Last  : Natural  := 0;

      Uname : Unit_Name_Type;
      Fname : File_Name_Type;
      Pname : File_Name_Type;

      procedure Empty_Tables;
      --  Remove all entries in case of incorrect mapping file

      function Find_File_Name return File_Name_Type;
      --  Return Error_File_Name if the name buffer contains "/", otherwise
      --  call Name_Find. "/" is the path name in the mapping file to indicate
      --  that a source has been suppressed, and thus should not be found by
      --  the compiler.

      function Find_Unit_Name return Unit_Name_Type;
      --  Return the unit name in the name buffer. Return Error_Unit_Name if
      --  the name buffer contains "/".

      procedure Get_Line;
      --  Get a line from the mapping file, where a line is SP (First .. Last)

      procedure Report_Truncated;
      --  Report a warning when the mapping file is truncated
      --  (number of lines is not a multiple of 3).

      ------------------
      -- Empty_Tables --
      ------------------

      procedure Empty_Tables is
      begin
         Unit_Hash_Table.Reset;
         File_Hash_Table.Reset;
         Path_Mapping.Set_Last (0);
         File_Mapping.Set_Last (0);
         Last_In_Table := 0;
      end Empty_Tables;

      --------------------
      -- Find_File_Name --
      --------------------

      function Find_File_Name return File_Name_Type is
      begin
         if Name_Buffer (1 .. Name_Len) = "/" then

            --  A path name of "/" is the indication that the source has been
            --  "suppressed". Return Error_File_Name so that the compiler does
            --  not find the source, even if it is in the include path.

            return Error_File_Name;

         else
            return Name_Find;
         end if;
      end Find_File_Name;

      --------------------
      -- Find_Unit_Name --
      --------------------

      function Find_Unit_Name return Unit_Name_Type is
      begin
         return Unit_Name_Type (Find_File_Name);
      end Find_Unit_Name;

      --------------
      -- Get_Line --
      --------------

      procedure Get_Line is
         use ASCII;

      begin
         First := Last + 1;

         --  If not at the end of file, skip the end of line

         while First < SP'Last
           and then (SP (First) = CR
                      or else SP (First) = LF
                      or else SP (First) = EOF)
         loop
            First := First + 1;
         end loop;

         --  If not at the end of file, find the end of this new line

         if First < SP'Last and then SP (First) /= EOF then
            Last := First;

            while Last < SP'Last
              and then SP (Last + 1) /= CR
              and then SP (Last + 1) /= LF
              and then SP (Last + 1) /= EOF
            loop
               Last := Last + 1;
            end loop;

         end if;
      end Get_Line;

      ----------------------
      -- Report_Truncated --
      ----------------------

      procedure Report_Truncated is
      begin
         Write_Str ("warning: mapping file """);
         Write_Str (File_Name);
         Write_Line (""" is truncated");
      end Report_Truncated;

   --  Start of processing for Initialize

   begin
      Empty_Tables;
      Name_Len := File_Name'Length;
      Name_Buffer (1 .. Name_Len) := File_Name;
      Read_Source_File (Name_Enter, 0, Hi, Src, Config);

      if Src = null then
         Write_Str ("warning: could not read mapping file """);
         Write_Str (File_Name);
         Write_Line ("""");
         No_Mapping_File := True;

      else
         BS := To_Big_String_Ptr (Src);
         SP := BS (1 .. Natural (Hi))'Unrestricted_Access;

         loop
            --  Get the unit name

            Get_Line;

            --  Exit if end of file has been reached

            exit when First > Last;

            if (Last < First + 2) or else (SP (Last - 1) /= '%')
              or else (SP (Last) /= 's' and then SP (Last) /= 'b')
            then
               Write_Line
                 ("warning: mapping file """ & File_Name &
                  """ is incorrectly formatted");
               Write_Line ("Line = """ & SP (First .. Last) & '"');
               Empty_Tables;
               return;
            end if;

            Name_Len := Last - First + 1;
            Name_Buffer (1 .. Name_Len) := SP (First .. Last);
            Uname := Find_Unit_Name;

            --  Get the file name

            Get_Line;

            --  If end of line has been reached, file is truncated

            if First > Last then
               Report_Truncated;
               Empty_Tables;
               return;
            end if;

            Name_Len := Last - First + 1;
            Name_Buffer (1 .. Name_Len) := SP (First .. Last);
            Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
            Fname := Find_File_Name;

            --  Get the path name

            Get_Line;

            --  If end of line has been reached, file is truncated

            if First > Last then
               Report_Truncated;
               Empty_Tables;
               return;
            end if;

            Name_Len := Last - First + 1;
            Name_Buffer (1 .. Name_Len) := SP (First .. Last);
            Pname := Find_File_Name;

            --  Add the mappings for this unit name

            Add_To_File_Map (Uname, Fname, Pname);
         end loop;
      end if;

      --  Record the length of the two mapping tables

      Last_In_Table := File_Mapping.Last;
   end Initialize;

   ----------------------
   -- Mapped_File_Name --
   ----------------------

   function Mapped_File_Name (Unit : Unit_Name_Type) return File_Name_Type is
      The_Index : constant Int := Unit_Hash_Table.Get (Unit);

   begin
      if The_Index = No_Entry then
         return No_File;
      else
         return File_Mapping.Table (The_Index).Fname;
      end if;
   end Mapped_File_Name;

   ----------------------
   -- Mapped_Path_Name --
   ----------------------

   function Mapped_Path_Name (File : File_Name_Type) return File_Name_Type is
      Index : Int := No_Entry;

   begin
      if Forbidden_Names.Get (File) then
         return Error_File_Name;
      end if;

      Index := File_Hash_Table.Get (File);

      if Index = No_Entry then
         return No_File;
      else
         return Path_Mapping.Table (Index).Fname;
      end if;
   end Mapped_Path_Name;

   ------------------
   -- Reset_Tables --
   ------------------

   procedure Reset_Tables is
   begin
      File_Mapping.Init;
      Path_Mapping.Init;
      Unit_Hash_Table.Reset;
      File_Hash_Table.Reset;
      Forbidden_Names.Reset;
      Last_In_Table := 0;
   end Reset_Tables;

   -------------------------
   -- Update_Mapping_File --
   -------------------------

   procedure Update_Mapping_File (File_Name : String) is
      File    : File_Descriptor;
      N_Bytes : Integer;

      File_Entry : Int;

      Status : Boolean;
      --  For the call to Close

      procedure Put_Line (Name : Name_Id);
      --  Put Name as a line in the Mapping File

      --------------
      -- Put_Line --
      --------------

      procedure Put_Line (Name : Name_Id) is
      begin
         Get_Name_String (Name);

         --  If the Buffer is full, write it to the file

         if Buffer_Last + Name_Len + 1 > Buffer'Last then
            N_Bytes := Write (File, Buffer (1)'Address, Buffer_Last);

            if N_Bytes < Buffer_Last then
               Fail ("disk full");
            end if;

            Buffer_Last := 0;
         end if;

         --  Add the line to the Buffer

         Buffer (Buffer_Last + 1 .. Buffer_Last + Name_Len) :=
           Name_Buffer (1 .. Name_Len);
         Buffer_Last := Buffer_Last + Name_Len + 1;
         Buffer (Buffer_Last) := ASCII.LF;
      end Put_Line;

   --  Start of Update_Mapping_File

   begin
      --  If the mapping file could not be read, then it will not be possible
      --  to update it.

      if No_Mapping_File then
         return;
      end if;
      --  Only Update if there are new entries in the mappings

      if Last_In_Table < File_Mapping.Last then

         File := Open_Read_Write (Name => File_Name, Fmode => Binary);

         if File /= Invalid_FD then
            if Last_In_Table > 0 then
               Lseek (File, 0, Seek_End);
            end if;

            for Unit in Last_In_Table + 1 .. File_Mapping.Last loop
               Put_Line (Name_Id (File_Mapping.Table (Unit).Uname));
               Put_Line (Name_Id (File_Mapping.Table (Unit).Fname));
               File_Entry :=
                 File_Hash_Table.Get (File_Mapping.Table (Unit).Fname);
               Put_Line (Name_Id (Path_Mapping.Table (File_Entry).Fname));
            end loop;

            --  Before closing the file, write the buffer to the file. It is
            --  guaranteed that the Buffer is not empty, because Put_Line has
            --  been called at least 3 times, and after a call to Put_Line, the
            --  Buffer is not empty.

            N_Bytes := Write (File, Buffer (1)'Address, Buffer_Last);

            if N_Bytes < Buffer_Last then
               Fail ("disk full");
            end if;

            Close (File, Status);

            if not Status then
               Fail ("disk full");
            end if;

         elsif not Quiet_Output then
            Write_Str ("warning: could not open mapping file """);
            Write_Str (File_Name);
            Write_Line (""" for update");
         end if;

      end if;
   end Update_Mapping_File;

end Fmap;