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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [macrotab.c] - Blame information for rev 157

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1 24 jeremybenn
/* C preprocessor macro tables for GDB.
2
   Copyright (C) 2002, 2007, 2008 Free Software Foundation, Inc.
3
   Contributed by Red Hat, Inc.
4
 
5
   This file is part of GDB.
6
 
7
   This program is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 3 of the License, or
10
   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
 
20
#include "defs.h"
21
#include "gdb_obstack.h"
22
#include "splay-tree.h"
23
#include "symtab.h"
24
#include "symfile.h"
25
#include "objfiles.h"
26
#include "macrotab.h"
27
#include "gdb_assert.h"
28
#include "bcache.h"
29
#include "complaints.h"
30
 
31
 
32
/* The macro table structure.  */
33
 
34
struct macro_table
35
{
36
  /* The obstack this table's data should be allocated in, or zero if
37
     we should use xmalloc.  */
38
  struct obstack *obstack;
39
 
40
  /* The bcache we should use to hold macro names, argument names, and
41
     definitions, or zero if we should use xmalloc.  */
42
  struct bcache *bcache;
43
 
44
  /* The main source file for this compilation unit --- the one whose
45
     name was given to the compiler.  This is the root of the
46
     #inclusion tree; everything else is #included from here.  */
47
  struct macro_source_file *main_source;
48
 
49
  /* The table of macro definitions.  This is a splay tree (an ordered
50
     binary tree that stays balanced, effectively), sorted by macro
51
     name.  Where a macro gets defined more than once (presumably with
52
     an #undefinition in between), we sort the definitions by the
53
     order they would appear in the preprocessor's output.  That is,
54
     if `a.c' #includes `m.h' and then #includes `n.h', and both
55
     header files #define X (with an #undef somewhere in between),
56
     then the definition from `m.h' appears in our splay tree before
57
     the one from `n.h'.
58
 
59
     The splay tree's keys are `struct macro_key' pointers;
60
     the values are `struct macro_definition' pointers.
61
 
62
     The splay tree, its nodes, and the keys and values are allocated
63
     in obstack, if it's non-zero, or with xmalloc otherwise.  The
64
     macro names, argument names, argument name arrays, and definition
65
     strings are all allocated in bcache, if non-zero, or with xmalloc
66
     otherwise.  */
67
  splay_tree definitions;
68
};
69
 
70
 
71
 
72
/* Allocation and freeing functions.  */
73
 
74
/* Allocate SIZE bytes of memory appropriately for the macro table T.
75
   This just checks whether T has an obstack, or whether its pieces
76
   should be allocated with xmalloc.  */
77
static void *
78
macro_alloc (int size, struct macro_table *t)
79
{
80
  if (t->obstack)
81
    return obstack_alloc (t->obstack, size);
82
  else
83
    return xmalloc (size);
84
}
85
 
86
 
87
static void
88
macro_free (void *object, struct macro_table *t)
89
{
90
  if (t->obstack)
91
    /* There are cases where we need to remove entries from a macro
92
       table, even when reading debugging information.  This should be
93
       rare, and there's no easy way to free arbitrary data from an
94
       obstack, so we just leak it.  */
95
    ;
96
  else
97
    xfree (object);
98
}
99
 
100
 
101
/* If the macro table T has a bcache, then cache the LEN bytes at ADDR
102
   there, and return the cached copy.  Otherwise, just xmalloc a copy
103
   of the bytes, and return a pointer to that.  */
104
static const void *
105
macro_bcache (struct macro_table *t, const void *addr, int len)
106
{
107
  if (t->bcache)
108
    return bcache (addr, len, t->bcache);
109
  else
110
    {
111
      void *copy = xmalloc (len);
112
      memcpy (copy, addr, len);
113
      return copy;
114
    }
115
}
116
 
117
 
118
/* If the macro table T has a bcache, cache the null-terminated string
119
   S there, and return a pointer to the cached copy.  Otherwise,
120
   xmalloc a copy and return that.  */
121
static const char *
122
macro_bcache_str (struct macro_table *t, const char *s)
123
{
124
  return (char *) macro_bcache (t, s, strlen (s) + 1);
125
}
126
 
127
 
128
/* Free a possibly bcached object OBJ.  That is, if the macro table T
129
   has a bcache, do nothing; otherwise, xfree OBJ.  */
130
static void
131
macro_bcache_free (struct macro_table *t, void *obj)
132
{
133
  if (t->bcache)
134
    /* There are cases where we need to remove entries from a macro
135
       table, even when reading debugging information.  This should be
136
       rare, and there's no easy way to free data from a bcache, so we
137
       just leak it.  */
138
    ;
139
  else
140
    xfree (obj);
141
}
142
 
143
 
144
 
145
/* Macro tree keys, w/their comparison, allocation, and freeing functions.  */
146
 
147
/* A key in the splay tree.  */
148
struct macro_key
149
{
150
  /* The table we're in.  We only need this in order to free it, since
151
     the splay tree library's key and value freeing functions require
152
     that the key or value contain all the information needed to free
153
     themselves.  */
154
  struct macro_table *table;
155
 
156
  /* The name of the macro.  This is in the table's bcache, if it has
157
     one. */
158
  const char *name;
159
 
160
  /* The source file and line number where the definition's scope
161
     begins.  This is also the line of the definition itself.  */
162
  struct macro_source_file *start_file;
163
  int start_line;
164
 
165
  /* The first source file and line after the definition's scope.
166
     (That is, the scope does not include this endpoint.)  If end_file
167
     is zero, then the definition extends to the end of the
168
     compilation unit.  */
169
  struct macro_source_file *end_file;
170
  int end_line;
171
};
172
 
173
 
174
/* Return the #inclusion depth of the source file FILE.  This is the
175
   number of #inclusions it took to reach this file.  For the main
176
   source file, the #inclusion depth is zero; for a file it #includes
177
   directly, the depth would be one; and so on.  */
178
static int
179
inclusion_depth (struct macro_source_file *file)
180
{
181
  int depth;
182
 
183
  for (depth = 0; file->included_by; depth++)
184
    file = file->included_by;
185
 
186
  return depth;
187
}
188
 
189
 
190
/* Compare two source locations (from the same compilation unit).
191
   This is part of the comparison function for the tree of
192
   definitions.
193
 
194
   LINE1 and LINE2 are line numbers in the source files FILE1 and
195
   FILE2.  Return a value:
196
   - less than zero if {LINE,FILE}1 comes before {LINE,FILE}2,
197
   - greater than zero if {LINE,FILE}1 comes after {LINE,FILE}2, or
198
   - zero if they are equal.
199
 
200
   When the two locations are in different source files --- perhaps
201
   one is in a header, while another is in the main source file --- we
202
   order them by where they would appear in the fully pre-processed
203
   sources, where all the #included files have been substituted into
204
   their places.  */
205
static int
206
compare_locations (struct macro_source_file *file1, int line1,
207
                   struct macro_source_file *file2, int line2)
208
{
209
  /* We want to treat positions in an #included file as coming *after*
210
     the line containing the #include, but *before* the line after the
211
     include.  As we walk up the #inclusion tree toward the main
212
     source file, we update fileX and lineX as we go; includedX
213
     indicates whether the original position was from the #included
214
     file.  */
215
  int included1 = 0;
216
  int included2 = 0;
217
 
218
  /* If a file is zero, that means "end of compilation unit."  Handle
219
     that specially.  */
220
  if (! file1)
221
    {
222
      if (! file2)
223
        return 0;
224
      else
225
        return 1;
226
    }
227
  else if (! file2)
228
    return -1;
229
 
230
  /* If the two files are not the same, find their common ancestor in
231
     the #inclusion tree.  */
232
  if (file1 != file2)
233
    {
234
      /* If one file is deeper than the other, walk up the #inclusion
235
         chain until the two files are at least at the same *depth*.
236
         Then, walk up both files in synchrony until they're the same
237
         file.  That file is the common ancestor.  */
238
      int depth1 = inclusion_depth (file1);
239
      int depth2 = inclusion_depth (file2);
240
 
241
      /* Only one of these while loops will ever execute in any given
242
         case.  */
243
      while (depth1 > depth2)
244
        {
245
          line1 = file1->included_at_line;
246
          file1 = file1->included_by;
247
          included1 = 1;
248
          depth1--;
249
        }
250
      while (depth2 > depth1)
251
        {
252
          line2 = file2->included_at_line;
253
          file2 = file2->included_by;
254
          included2 = 1;
255
          depth2--;
256
        }
257
 
258
      /* Now both file1 and file2 are at the same depth.  Walk toward
259
         the root of the tree until we find where the branches meet.  */
260
      while (file1 != file2)
261
        {
262
          line1 = file1->included_at_line;
263
          file1 = file1->included_by;
264
          /* At this point, we know that the case the includedX flags
265
             are trying to deal with won't come up, but we'll just
266
             maintain them anyway.  */
267
          included1 = 1;
268
 
269
          line2 = file2->included_at_line;
270
          file2 = file2->included_by;
271
          included2 = 1;
272
 
273
          /* Sanity check.  If file1 and file2 are really from the
274
             same compilation unit, then they should both be part of
275
             the same tree, and this shouldn't happen.  */
276
          gdb_assert (file1 && file2);
277
        }
278
    }
279
 
280
  /* Now we've got two line numbers in the same file.  */
281
  if (line1 == line2)
282
    {
283
      /* They can't both be from #included files.  Then we shouldn't
284
         have walked up this far.  */
285
      gdb_assert (! included1 || ! included2);
286
 
287
      /* Any #included position comes after a non-#included position
288
         with the same line number in the #including file.  */
289
      if (included1)
290
        return 1;
291
      else if (included2)
292
        return -1;
293
      else
294
        return 0;
295
    }
296
  else
297
    return line1 - line2;
298
}
299
 
300
 
301
/* Compare a macro key KEY against NAME, the source file FILE, and
302
   line number LINE.
303
 
304
   Sort definitions by name; for two definitions with the same name,
305
   place the one whose definition comes earlier before the one whose
306
   definition comes later.
307
 
308
   Return -1, 0, or 1 if key comes before, is identical to, or comes
309
   after NAME, FILE, and LINE.  */
310
static int
311
key_compare (struct macro_key *key,
312
             const char *name, struct macro_source_file *file, int line)
313
{
314
  int names = strcmp (key->name, name);
315
  if (names)
316
    return names;
317
 
318
  return compare_locations (key->start_file, key->start_line,
319
                            file, line);
320
}
321
 
322
 
323
/* The macro tree comparison function, typed for the splay tree
324
   library's happiness.  */
325
static int
326
macro_tree_compare (splay_tree_key untyped_key1,
327
                    splay_tree_key untyped_key2)
328
{
329
  struct macro_key *key1 = (struct macro_key *) untyped_key1;
330
  struct macro_key *key2 = (struct macro_key *) untyped_key2;
331
 
332
  return key_compare (key1, key2->name, key2->start_file, key2->start_line);
333
}
334
 
335
 
336
/* Construct a new macro key node for a macro in table T whose name is
337
   NAME, and whose scope starts at LINE in FILE; register the name in
338
   the bcache.  */
339
static struct macro_key *
340
new_macro_key (struct macro_table *t,
341
               const char *name,
342
               struct macro_source_file *file,
343
               int line)
344
{
345
  struct macro_key *k = macro_alloc (sizeof (*k), t);
346
 
347
  memset (k, 0, sizeof (*k));
348
  k->table = t;
349
  k->name = macro_bcache_str (t, name);
350
  k->start_file = file;
351
  k->start_line = line;
352
  k->end_file = 0;
353
 
354
  return k;
355
}
356
 
357
 
358
static void
359
macro_tree_delete_key (void *untyped_key)
360
{
361
  struct macro_key *key = (struct macro_key *) untyped_key;
362
 
363
  macro_bcache_free (key->table, (char *) key->name);
364
  macro_free (key, key->table);
365
}
366
 
367
 
368
 
369
/* Building and querying the tree of #included files.  */
370
 
371
 
372
/* Allocate and initialize a new source file structure.  */
373
static struct macro_source_file *
374
new_source_file (struct macro_table *t,
375
                 const char *filename)
376
{
377
  /* Get space for the source file structure itself.  */
378
  struct macro_source_file *f = macro_alloc (sizeof (*f), t);
379
 
380
  memset (f, 0, sizeof (*f));
381
  f->table = t;
382
  f->filename = macro_bcache_str (t, filename);
383
  f->includes = 0;
384
 
385
  return f;
386
}
387
 
388
 
389
/* Free a source file, and all the source files it #included.  */
390
static void
391
free_macro_source_file (struct macro_source_file *src)
392
{
393
  struct macro_source_file *child, *next_child;
394
 
395
  /* Free this file's children.  */
396
  for (child = src->includes; child; child = next_child)
397
    {
398
      next_child = child->next_included;
399
      free_macro_source_file (child);
400
    }
401
 
402
  macro_bcache_free (src->table, (char *) src->filename);
403
  macro_free (src, src->table);
404
}
405
 
406
 
407
struct macro_source_file *
408
macro_set_main (struct macro_table *t,
409
                const char *filename)
410
{
411
  /* You can't change a table's main source file.  What would that do
412
     to the tree?  */
413
  gdb_assert (! t->main_source);
414
 
415
  t->main_source = new_source_file (t, filename);
416
 
417
  return t->main_source;
418
}
419
 
420
 
421
struct macro_source_file *
422
macro_main (struct macro_table *t)
423
{
424
  gdb_assert (t->main_source);
425
 
426
  return t->main_source;
427
}
428
 
429
 
430
struct macro_source_file *
431
macro_include (struct macro_source_file *source,
432
               int line,
433
               const char *included)
434
{
435
  struct macro_source_file *new;
436
  struct macro_source_file **link;
437
 
438
  /* Find the right position in SOURCE's `includes' list for the new
439
     file.  Skip inclusions at earlier lines, until we find one at the
440
     same line or later --- or until the end of the list.  */
441
  for (link = &source->includes;
442
       *link && (*link)->included_at_line < line;
443
       link = &(*link)->next_included)
444
    ;
445
 
446
  /* Did we find another file already #included at the same line as
447
     the new one?  */
448
  if (*link && line == (*link)->included_at_line)
449
    {
450
      /* This means the compiler is emitting bogus debug info.  (GCC
451
         circa March 2002 did this.)  It also means that the splay
452
         tree ordering function, macro_tree_compare, will abort,
453
         because it can't tell which #inclusion came first.  But GDB
454
         should tolerate bad debug info.  So:
455
 
456
         First, squawk.  */
457
      complaint (&symfile_complaints,
458
                 _("both `%s' and `%s' allegedly #included at %s:%d"), included,
459
                 (*link)->filename, source->filename, line);
460
 
461
      /* Now, choose a new, unoccupied line number for this
462
         #inclusion, after the alleged #inclusion line.  */
463
      while (*link && line == (*link)->included_at_line)
464
        {
465
          /* This line number is taken, so try the next line.  */
466
          line++;
467
          link = &(*link)->next_included;
468
        }
469
    }
470
 
471
  /* At this point, we know that LINE is an unused line number, and
472
     *LINK points to the entry an #inclusion at that line should
473
     precede.  */
474
  new = new_source_file (source->table, included);
475
  new->included_by = source;
476
  new->included_at_line = line;
477
  new->next_included = *link;
478
  *link = new;
479
 
480
  return new;
481
}
482
 
483
 
484
struct macro_source_file *
485
macro_lookup_inclusion (struct macro_source_file *source, const char *name)
486
{
487
  /* Is SOURCE itself named NAME?  */
488
  if (strcmp (name, source->filename) == 0)
489
    return source;
490
 
491
  /* The filename in the source structure is probably a full path, but
492
     NAME could be just the final component of the name.  */
493
  {
494
    int name_len = strlen (name);
495
    int src_name_len = strlen (source->filename);
496
 
497
    /* We do mean < here, and not <=; if the lengths are the same,
498
       then the strcmp above should have triggered, and we need to
499
       check for a slash here.  */
500
    if (name_len < src_name_len
501
        && source->filename[src_name_len - name_len - 1] == '/'
502
        && strcmp (name, source->filename + src_name_len - name_len) == 0)
503
      return source;
504
  }
505
 
506
  /* It's not us.  Try all our children, and return the lowest.  */
507
  {
508
    struct macro_source_file *child;
509
    struct macro_source_file *best = NULL;
510
    int best_depth = 0;
511
 
512
    for (child = source->includes; child; child = child->next_included)
513
      {
514
        struct macro_source_file *result
515
          = macro_lookup_inclusion (child, name);
516
 
517
        if (result)
518
          {
519
            int result_depth = inclusion_depth (result);
520
 
521
            if (! best || result_depth < best_depth)
522
              {
523
                best = result;
524
                best_depth = result_depth;
525
              }
526
          }
527
      }
528
 
529
    return best;
530
  }
531
}
532
 
533
 
534
 
535
/* Registering and looking up macro definitions.  */
536
 
537
 
538
/* Construct a definition for a macro in table T.  Cache all strings,
539
   and the macro_definition structure itself, in T's bcache.  */
540
static struct macro_definition *
541
new_macro_definition (struct macro_table *t,
542
                      enum macro_kind kind,
543
                      int argc, const char **argv,
544
                      const char *replacement)
545
{
546
  struct macro_definition *d = macro_alloc (sizeof (*d), t);
547
 
548
  memset (d, 0, sizeof (*d));
549
  d->table = t;
550
  d->kind = kind;
551
  d->replacement = macro_bcache_str (t, replacement);
552
 
553
  if (kind == macro_function_like)
554
    {
555
      int i;
556
      const char **cached_argv;
557
      int cached_argv_size = argc * sizeof (*cached_argv);
558
 
559
      /* Bcache all the arguments.  */
560
      cached_argv = alloca (cached_argv_size);
561
      for (i = 0; i < argc; i++)
562
        cached_argv[i] = macro_bcache_str (t, argv[i]);
563
 
564
      /* Now bcache the array of argument pointers itself.  */
565
      d->argv = macro_bcache (t, cached_argv, cached_argv_size);
566
      d->argc = argc;
567
    }
568
 
569
  /* We don't bcache the entire definition structure because it's got
570
     a pointer to the macro table in it; since each compilation unit
571
     has its own macro table, you'd only get bcache hits for identical
572
     definitions within a compilation unit, which seems unlikely.
573
 
574
     "So, why do macro definitions have pointers to their macro tables
575
     at all?"  Well, when the splay tree library wants to free a
576
     node's value, it calls the value freeing function with nothing
577
     but the value itself.  It makes the (apparently reasonable)
578
     assumption that the value carries enough information to free
579
     itself.  But not all macro tables have bcaches, so not all macro
580
     definitions would be bcached.  There's no way to tell whether a
581
     given definition is bcached without knowing which table the
582
     definition belongs to.  ...  blah.  The thing's only sixteen
583
     bytes anyway, and we can still bcache the name, args, and
584
     definition, so we just don't bother bcaching the definition
585
     structure itself.  */
586
  return d;
587
}
588
 
589
 
590
/* Free a macro definition.  */
591
static void
592
macro_tree_delete_value (void *untyped_definition)
593
{
594
  struct macro_definition *d = (struct macro_definition *) untyped_definition;
595
  struct macro_table *t = d->table;
596
 
597
  if (d->kind == macro_function_like)
598
    {
599
      int i;
600
 
601
      for (i = 0; i < d->argc; i++)
602
        macro_bcache_free (t, (char *) d->argv[i]);
603
      macro_bcache_free (t, (char **) d->argv);
604
    }
605
 
606
  macro_bcache_free (t, (char *) d->replacement);
607
  macro_free (d, t);
608
}
609
 
610
 
611
/* Find the splay tree node for the definition of NAME at LINE in
612
   SOURCE, or zero if there is none.  */
613
static splay_tree_node
614
find_definition (const char *name,
615
                 struct macro_source_file *file,
616
                 int line)
617
{
618
  struct macro_table *t = file->table;
619
  splay_tree_node n;
620
 
621
  /* Construct a macro_key object, just for the query.  */
622
  struct macro_key query;
623
 
624
  query.name = name;
625
  query.start_file = file;
626
  query.start_line = line;
627
  query.end_file = NULL;
628
 
629
  n = splay_tree_lookup (t->definitions, (splay_tree_key) &query);
630
  if (! n)
631
    {
632
      /* It's okay for us to do two queries like this: the real work
633
         of the searching is done when we splay, and splaying the tree
634
         a second time at the same key is a constant time operation.
635
         If this still bugs you, you could always just extend the
636
         splay tree library with a predecessor-or-equal operation, and
637
         use that.  */
638
      splay_tree_node pred = splay_tree_predecessor (t->definitions,
639
                                                     (splay_tree_key) &query);
640
 
641
      if (pred)
642
        {
643
          /* Make sure this predecessor actually has the right name.
644
             We just want to search within a given name's definitions.  */
645
          struct macro_key *found = (struct macro_key *) pred->key;
646
 
647
          if (strcmp (found->name, name) == 0)
648
            n = pred;
649
        }
650
    }
651
 
652
  if (n)
653
    {
654
      struct macro_key *found = (struct macro_key *) n->key;
655
 
656
      /* Okay, so this definition has the right name, and its scope
657
         begins before the given source location.  But does its scope
658
         end after the given source location?  */
659
      if (compare_locations (file, line, found->end_file, found->end_line) < 0)
660
        return n;
661
      else
662
        return 0;
663
    }
664
  else
665
    return 0;
666
}
667
 
668
 
669
/* If NAME already has a definition in scope at LINE in SOURCE, return
670
   the key.  If the old definition is different from the definition
671
   given by KIND, ARGC, ARGV, and REPLACEMENT, complain, too.
672
   Otherwise, return zero.  (ARGC and ARGV are meaningless unless KIND
673
   is `macro_function_like'.)  */
674
static struct macro_key *
675
check_for_redefinition (struct macro_source_file *source, int line,
676
                        const char *name, enum macro_kind kind,
677
                        int argc, const char **argv,
678
                        const char *replacement)
679
{
680
  splay_tree_node n = find_definition (name, source, line);
681
 
682
  if (n)
683
    {
684
      struct macro_key *found_key = (struct macro_key *) n->key;
685
      struct macro_definition *found_def
686
        = (struct macro_definition *) n->value;
687
      int same = 1;
688
 
689
      /* Is this definition the same as the existing one?
690
         According to the standard, this comparison needs to be done
691
         on lists of tokens, not byte-by-byte, as we do here.  But
692
         that's too hard for us at the moment, and comparing
693
         byte-by-byte will only yield false negatives (i.e., extra
694
         warning messages), not false positives (i.e., unnoticed
695
         definition changes).  */
696
      if (kind != found_def->kind)
697
        same = 0;
698
      else if (strcmp (replacement, found_def->replacement))
699
        same = 0;
700
      else if (kind == macro_function_like)
701
        {
702
          if (argc != found_def->argc)
703
            same = 0;
704
          else
705
            {
706
              int i;
707
 
708
              for (i = 0; i < argc; i++)
709
                if (strcmp (argv[i], found_def->argv[i]))
710
                  same = 0;
711
            }
712
        }
713
 
714
      if (! same)
715
        {
716
          complaint (&symfile_complaints,
717
                     _("macro `%s' redefined at %s:%d; original definition at %s:%d"),
718
                     name, source->filename, line,
719
                     found_key->start_file->filename, found_key->start_line);
720
        }
721
 
722
      return found_key;
723
    }
724
  else
725
    return 0;
726
}
727
 
728
 
729
void
730
macro_define_object (struct macro_source_file *source, int line,
731
                     const char *name, const char *replacement)
732
{
733
  struct macro_table *t = source->table;
734
  struct macro_key *k;
735
  struct macro_definition *d;
736
 
737
  k = check_for_redefinition (source, line,
738
                              name, macro_object_like,
739
                              0, 0,
740
                              replacement);
741
 
742
  /* If we're redefining a symbol, and the existing key would be
743
     identical to our new key, then the splay_tree_insert function
744
     will try to delete the old definition.  When the definition is
745
     living on an obstack, this isn't a happy thing.
746
 
747
     Since this only happens in the presence of questionable debug
748
     info, we just ignore all definitions after the first.  The only
749
     case I know of where this arises is in GCC's output for
750
     predefined macros, and all the definitions are the same in that
751
     case.  */
752
  if (k && ! key_compare (k, name, source, line))
753
    return;
754
 
755
  k = new_macro_key (t, name, source, line);
756
  d = new_macro_definition (t, macro_object_like, 0, 0, replacement);
757
  splay_tree_insert (t->definitions, (splay_tree_key) k, (splay_tree_value) d);
758
}
759
 
760
 
761
void
762
macro_define_function (struct macro_source_file *source, int line,
763
                       const char *name, int argc, const char **argv,
764
                       const char *replacement)
765
{
766
  struct macro_table *t = source->table;
767
  struct macro_key *k;
768
  struct macro_definition *d;
769
 
770
  k = check_for_redefinition (source, line,
771
                              name, macro_function_like,
772
                              argc, argv,
773
                              replacement);
774
 
775
  /* See comments about duplicate keys in macro_define_object.  */
776
  if (k && ! key_compare (k, name, source, line))
777
    return;
778
 
779
  /* We should also check here that all the argument names in ARGV are
780
     distinct.  */
781
 
782
  k = new_macro_key (t, name, source, line);
783
  d = new_macro_definition (t, macro_function_like, argc, argv, replacement);
784
  splay_tree_insert (t->definitions, (splay_tree_key) k, (splay_tree_value) d);
785
}
786
 
787
 
788
void
789
macro_undef (struct macro_source_file *source, int line,
790
             const char *name)
791
{
792
  splay_tree_node n = find_definition (name, source, line);
793
 
794
  if (n)
795
    {
796
      struct macro_key *key = (struct macro_key *) n->key;
797
 
798
      /* If we're removing a definition at exactly the same point that
799
         we defined it, then just delete the entry altogether.  GCC
800
         4.1.2 will generate DWARF that says to do this if you pass it
801
         arguments like '-DFOO -UFOO -DFOO=2'.  */
802
      if (source == key->start_file
803
          && line == key->start_line)
804
        splay_tree_remove (source->table->definitions, n->key);
805
 
806
      else
807
        {
808
          /* This function is the only place a macro's end-of-scope
809
             location gets set to anything other than "end of the
810
             compilation unit" (i.e., end_file is zero).  So if this
811
             macro already has its end-of-scope set, then we're
812
             probably seeing a second #undefinition for the same
813
             #definition.  */
814
          if (key->end_file)
815
            {
816
              complaint (&symfile_complaints,
817
                         _("macro '%s' is #undefined twice,"
818
                           " at %s:%d and %s:%d"),
819
                         name,
820
                         source->filename, line,
821
                         key->end_file->filename, key->end_line);
822
            }
823
 
824
          /* Whether or not we've seen a prior #undefinition, wipe out
825
             the old ending point, and make this the ending point.  */
826
          key->end_file = source;
827
          key->end_line = line;
828
        }
829
    }
830
  else
831
    {
832
      /* According to the ISO C standard, an #undef for a symbol that
833
         has no macro definition in scope is ignored.  So we should
834
         ignore it too.  */
835
#if 0
836
      complaint (&symfile_complaints,
837
                 _("no definition for macro `%s' in scope to #undef at %s:%d"),
838
                 name, source->filename, line);
839
#endif
840
    }
841
}
842
 
843
 
844
struct macro_definition *
845
macro_lookup_definition (struct macro_source_file *source,
846
                         int line, const char *name)
847
{
848
  splay_tree_node n = find_definition (name, source, line);
849
 
850
  if (n)
851
    return (struct macro_definition *) n->value;
852
  else
853
    return 0;
854
}
855
 
856
 
857
struct macro_source_file *
858
macro_definition_location (struct macro_source_file *source,
859
                           int line,
860
                           const char *name,
861
                           int *definition_line)
862
{
863
  splay_tree_node n = find_definition (name, source, line);
864
 
865
  if (n)
866
    {
867
      struct macro_key *key = (struct macro_key *) n->key;
868
      *definition_line = key->start_line;
869
      return key->start_file;
870
    }
871
  else
872
    return 0;
873
}
874
 
875
 
876
 
877
/* Creating and freeing macro tables.  */
878
 
879
 
880
struct macro_table *
881
new_macro_table (struct obstack *obstack,
882
                 struct bcache *b)
883
{
884
  struct macro_table *t;
885
 
886
  /* First, get storage for the `struct macro_table' itself.  */
887
  if (obstack)
888
    t = obstack_alloc (obstack, sizeof (*t));
889
  else
890
    t = xmalloc (sizeof (*t));
891
 
892
  memset (t, 0, sizeof (*t));
893
  t->obstack = obstack;
894
  t->bcache = b;
895
  t->main_source = NULL;
896
  t->definitions = (splay_tree_new_with_allocator
897
                    (macro_tree_compare,
898
                     ((splay_tree_delete_key_fn) macro_tree_delete_key),
899
                     ((splay_tree_delete_value_fn) macro_tree_delete_value),
900
                     ((splay_tree_allocate_fn) macro_alloc),
901
                     ((splay_tree_deallocate_fn) macro_free),
902
                     t));
903
 
904
  return t;
905
}
906
 
907
 
908
void
909
free_macro_table (struct macro_table *table)
910
{
911
  /* Free the source file tree.  */
912
  free_macro_source_file (table->main_source);
913
 
914
  /* Free the table of macro definitions.  */
915
  splay_tree_delete (table->definitions);
916
}

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