aboutsummaryrefslogtreecommitdiff
path: root/gcc/vec.c
blob: 3e60580992d14d48c274638eda6d850ba0bd347d (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
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
/* Vector API for GNU compiler.
   Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   Contributed by Nathan Sidwell <nathan@codesourcery.com>

This file is part of GCC.

GCC 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 3, or (at your option) any later
version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* This file is compiled twice: once for the generator programs
   once for the compiler.  */
#ifdef GENERATOR_FILE
#include "bconfig.h"
#else
#include "config.h"
#endif

#include "system.h"
#include "ggc.h"
#include "vec.h"
#include "coretypes.h"
#include "toplev.h"
#include "hashtab.h"

struct vec_prefix 
{
  unsigned num;
  unsigned alloc;
  void *vec[1];
};


#ifdef GATHER_STATISTICS

/* Store information about each particular vector.  */
struct vec_descriptor
{
  const char *function;
  const char *file;
  int line;
  size_t allocated;
  size_t times;
  size_t peak;
};


/* Hashtable mapping vec addresses to descriptors.  */
static htab_t vec_desc_hash;

/* Hashtable helpers.  */
static hashval_t
hash_descriptor (const void *p)
{
  const struct vec_descriptor *const d =
    (const struct vec_descriptor *) p;
  return htab_hash_pointer (d->file) + d->line;
}
static int
eq_descriptor (const void *p1, const void *p2)
{
  const struct vec_descriptor *const d = (const struct vec_descriptor *) p1;
  const struct vec_descriptor *const l = (const struct vec_descriptor *) p2;
  return d->file == l->file && d->function == l->function && d->line == l->line;
}

/* Hashtable converting address of allocated field to loc descriptor.  */
static htab_t ptr_hash;
struct ptr_hash_entry
{
  void *ptr;
  struct vec_descriptor *loc;
  size_t allocated;
};

/* Hash table helpers functions.  */
static hashval_t
hash_ptr (const void *p)
{
  const struct ptr_hash_entry *const d = (const struct ptr_hash_entry *) p;

  return htab_hash_pointer (d->ptr);
}

static int
eq_ptr (const void *p1, const void *p2)
{
  const struct ptr_hash_entry *const p = (const struct ptr_hash_entry *) p1;

  return (p->ptr == p2);
}

/* Return descriptor for given call site, create new one if needed.  */
static struct vec_descriptor *
vec_descriptor (const char *name, int line, const char *function)
{
  struct vec_descriptor loc;
  struct vec_descriptor **slot;

  loc.file = name;
  loc.line = line;
  loc.function = function;
  if (!vec_desc_hash)
    vec_desc_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL);

  slot = (struct vec_descriptor **) htab_find_slot (vec_desc_hash, &loc,
						    INSERT);
  if (*slot)
    return *slot;
  *slot = XCNEW (struct vec_descriptor);
  (*slot)->file = name;
  (*slot)->line = line;
  (*slot)->function = function;
  (*slot)->allocated = 0;
  (*slot)->peak = 0;
  return *slot;
}

/* Account the overhead.  */
static void
register_overhead (struct vec_prefix *ptr, size_t size,
		   const char *name, int line, const char *function)
{
  struct vec_descriptor *loc = vec_descriptor (name, line, function);
  struct ptr_hash_entry *p = XNEW (struct ptr_hash_entry);
  PTR *slot;

  p->ptr = ptr;
  p->loc = loc;
  p->allocated = size;
  if (!ptr_hash)
    ptr_hash = htab_create (10, hash_ptr, eq_ptr, NULL);
  slot = htab_find_slot_with_hash (ptr_hash, ptr, htab_hash_pointer (ptr), INSERT);
  gcc_assert (!*slot);
  *slot = p;

  loc->allocated += size;
  if (loc->peak < loc->allocated)
    loc->peak += loc->allocated;
  loc->times++;
}

/* Notice that the pointer has been freed.  */
static void
free_overhead (struct vec_prefix *ptr)
{
  PTR *slot = htab_find_slot_with_hash (ptr_hash, ptr, htab_hash_pointer (ptr),
					NO_INSERT);
  struct ptr_hash_entry *p = (struct ptr_hash_entry *) *slot;
  p->loc->allocated -= p->allocated;
  htab_clear_slot (ptr_hash, slot);
  free (p);
}

void
vec_heap_free (void *ptr)
{
  free_overhead ((struct vec_prefix *)ptr);
  free (ptr);
}
#endif

/* Calculate the new ALLOC value, making sure that RESERVE slots are
   free.  If EXACT grow exactly, otherwise grow exponentially.  */

static inline unsigned
calculate_allocation (const struct vec_prefix *pfx, int reserve, bool exact)
{
  unsigned alloc = 0;
  unsigned num = 0;

  gcc_assert (reserve >= 0);

  if (pfx)
    {
      alloc = pfx->alloc;
      num = pfx->num;
    }
  else if (!reserve)
    /* If there's no prefix, and we've not requested anything, then we
       will create a NULL vector.  */
    return 0;
  
  /* We must have run out of room.  */
  gcc_assert (alloc - num < (unsigned) reserve);
  
  if (exact)
    /* Exact size.  */
    alloc = num + reserve;
  else
    {
      /* Exponential growth. */
      if (!alloc)
	alloc = 4;
      else if (alloc < 16)
	/* Double when small.  */
	alloc = alloc * 2;
      else
	/* Grow slower when large.  */
	alloc = (alloc * 3 / 2);
      
      /* If this is still too small, set it to the right size. */
      if (alloc < num + reserve)
	alloc = num + reserve;
    }
  return alloc;
}

/* Ensure there are at least RESERVE free slots in VEC.  If EXACT grow
   exactly, else grow exponentially.  As a special case, if VEC is
   NULL and RESERVE is 0, no vector will be created.  The vector's
   trailing array is at VEC_OFFSET offset and consists of ELT_SIZE
   sized elements.  */

static void *
vec_gc_o_reserve_1 (void *vec, int reserve, size_t vec_offset, size_t elt_size,
		    bool exact MEM_STAT_DECL)
{
  struct vec_prefix *pfx = (struct vec_prefix *) vec;
  unsigned alloc = calculate_allocation (pfx, reserve, exact);
  
  if (!alloc)
    {
      if (pfx)
        ggc_free (pfx);
      return NULL;
    }
  
  vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT);
  ((struct vec_prefix *)vec)->alloc = alloc;
  if (!pfx)
    ((struct vec_prefix *)vec)->num = 0;
  
  return vec;
}

/* Ensure there are at least RESERVE free slots in VEC, growing
   exponentially.  If RESERVE < 0 grow exactly, else grow
   exponentially.  As a special case, if VEC is NULL, and RESERVE is
   0, no vector will be created. */

void *
vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
{
  return vec_gc_o_reserve_1 (vec, reserve,
			     offsetof (struct vec_prefix, vec),
			     sizeof (void *), false
			     PASS_MEM_STAT);
}

/* Ensure there are at least RESERVE free slots in VEC, growing
   exactly.  If RESERVE < 0 grow exactly, else grow exponentially.  As
   a special case, if VEC is NULL, and RESERVE is 0, no vector will be
   created. */

void *
vec_gc_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
{
  return vec_gc_o_reserve_1 (vec, reserve,
			     offsetof (struct vec_prefix, vec),
			     sizeof (void *), true
			     PASS_MEM_STAT);
}

/* As for vec_gc_p_reserve, but for object vectors.  The vector's
   trailing array is at VEC_OFFSET offset and consists of ELT_SIZE
   sized elements.  */

void *
vec_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
		  MEM_STAT_DECL)
{
  return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
			     PASS_MEM_STAT);
}

/* As for vec_gc_p_reserve_exact, but for object vectors.  The
   vector's trailing array is at VEC_OFFSET offset and consists of
   ELT_SIZE sized elements.  */

void *
vec_gc_o_reserve_exact (void *vec, int reserve, size_t vec_offset,
			size_t elt_size MEM_STAT_DECL)
{
  return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
			     PASS_MEM_STAT);
}

/* As for vec_gc_o_reserve_1, but for heap allocated vectors.  */

static void *
vec_heap_o_reserve_1 (void *vec, int reserve, size_t vec_offset,
		      size_t elt_size, bool exact MEM_STAT_DECL)
{
  struct vec_prefix *pfx = (struct vec_prefix *) vec;
  unsigned alloc = calculate_allocation (pfx, reserve, exact);

  if (!alloc)
    {
      if (pfx)
        vec_heap_free (pfx);
      return NULL;
    }

#ifdef GATHER_STATISTICS
  if (vec)
    free_overhead (pfx);
#endif
  
  vec = xrealloc (vec, vec_offset + alloc * elt_size);
  ((struct vec_prefix *)vec)->alloc = alloc;
  if (!pfx)
    ((struct vec_prefix *)vec)->num = 0;
#ifdef GATHER_STATISTICS
  if (vec)
    register_overhead ((struct vec_prefix *)vec,
    		       vec_offset + alloc * elt_size PASS_MEM_STAT);
#endif
  
  return vec;
}

/* As for vec_gc_p_reserve, but for heap allocated vectors.  */

void *
vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
{
  return vec_heap_o_reserve_1 (vec, reserve,
			       offsetof (struct vec_prefix, vec),
			       sizeof (void *), false
			       PASS_MEM_STAT);
}

/* As for vec_gc_p_reserve_exact, but for heap allocated vectors.  */

void *
vec_heap_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
{
  return vec_heap_o_reserve_1 (vec, reserve,
			       offsetof (struct vec_prefix, vec),
			       sizeof (void *), true
			       PASS_MEM_STAT);
}

/* As for vec_gc_o_reserve, but for heap allocated vectors.  */

void *
vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
		    MEM_STAT_DECL)
{
  return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
			       PASS_MEM_STAT);
}

/* As for vec_gc_o_reserve_exact, but for heap allocated vectors.  */

void *
vec_heap_o_reserve_exact (void *vec, int reserve, size_t vec_offset,
			  size_t elt_size MEM_STAT_DECL)
{
  return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
			       PASS_MEM_STAT);
}

/* Stack vectors are a little different.  VEC_alloc turns into a call
   to vec_stack_p_reserve_exact1 and passes in space allocated via a
   call to alloca.  We record that pointer so that we know that we
   shouldn't free it.  If the vector is resized, we resize it on the
   heap.  We record the pointers in a vector and search it in LIFO
   order--i.e., we look for the newest stack vectors first.  We don't
   expect too many stack vectors at any one level, and searching from
   the end should normally be efficient even if they are used in a
   recursive function.  */

typedef void *void_p;
DEF_VEC_P(void_p);
DEF_VEC_ALLOC_P(void_p,heap);

static VEC(void_p,heap) *stack_vecs;

/* Allocate a vector which uses alloca for the initial allocation.
   SPACE is space allocated using alloca, ALLOC is the number of
   entries allocated.  */

void *
vec_stack_p_reserve_exact_1 (int alloc, void *space)
{
  struct vec_prefix *pfx = (struct vec_prefix *) space;

  VEC_safe_push (void_p, heap, stack_vecs, space);

  pfx->num = 0;
  pfx->alloc = alloc;

  return space;
}

/* Grow a vector allocated using alloca.  When this happens, we switch
   back to heap allocation.  We remove the vector from stack_vecs, if
   it is there, since we no longer need to avoid freeing it.  */

static void *
vec_stack_o_reserve_1 (void *vec, int reserve, size_t vec_offset,
		       size_t elt_size, bool exact MEM_STAT_DECL)
{
  bool found;
  unsigned int ix;
  void *newvec;

  found = false;
  for (ix = VEC_length (void_p, stack_vecs); ix > 0; --ix)
    {
      if (VEC_index (void_p, stack_vecs, ix - 1) == vec)
	{
	  VEC_unordered_remove (void_p, stack_vecs, ix - 1);
	  found = true;
	  break;
	}
    }

  if (!found)
    {
      /* VEC is already on the heap.  */
      return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size,
				   exact PASS_MEM_STAT);
    }

  /* Move VEC to the heap.  */
  reserve += ((struct vec_prefix *) vec)->num;
  newvec = vec_heap_o_reserve_1 (NULL, reserve, vec_offset, elt_size,
				 exact PASS_MEM_STAT);
  if (newvec && vec)
    {
      ((struct vec_prefix *) newvec)->num = ((struct vec_prefix *) vec)->num;
      memcpy (((struct vec_prefix *) newvec)->vec,
	      ((struct vec_prefix *) vec)->vec,
	      ((struct vec_prefix *) vec)->num * elt_size);
    }
  return newvec;
}

/* Grow a vector allocated on the stack.  */

void *
vec_stack_p_reserve (void *vec, int reserve MEM_STAT_DECL)
{
  return vec_stack_o_reserve_1 (vec, reserve,
				offsetof (struct vec_prefix, vec),
				sizeof (void *), false
				PASS_MEM_STAT);
}

/* Exact version of vec_stack_p_reserve.  */

void *
vec_stack_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
{
  return vec_stack_o_reserve_1 (vec, reserve,
				offsetof (struct vec_prefix, vec),
				sizeof (void *), true
				PASS_MEM_STAT);
}

/* Like vec_stack_p_reserve, but for objects.  */

void *
vec_stack_o_reserve (void *vec, int reserve, size_t vec_offset,
		     size_t elt_size MEM_STAT_DECL)
{
  return vec_stack_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
				PASS_MEM_STAT);
}

/* Like vec_stack_p_reserve_exact, but for objects.  */

void *
vec_stack_o_reserve_exact (void *vec, int reserve, size_t vec_offset,
			    size_t elt_size MEM_STAT_DECL)
{
  return vec_stack_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
				PASS_MEM_STAT);
}

/* Free a vector allocated on the stack.  Don't actually free it if we
   find it in the hash table.  */

void
vec_stack_free (void *vec)
{
  unsigned int ix;

  for (ix = VEC_length (void_p, stack_vecs); ix > 0; --ix)
    {
      if (VEC_index (void_p, stack_vecs, ix - 1) == vec)
	{
	  VEC_unordered_remove (void_p, stack_vecs, ix - 1);
	  return;
	}
    }

  /* VEC was not on the list of vecs allocated on the stack, so it
     must be allocated on the heap.  */
  vec_heap_free (vec);
}

#if ENABLE_CHECKING
/* Issue a vector domain error, and then fall over.  */

void
vec_assert_fail (const char *op, const char *struct_name,
		 const char *file, unsigned int line, const char *function)
{
  internal_error ("vector %s %s domain error, in %s at %s:%u",
		  struct_name, op, function, trim_filename (file), line);
}
#endif

#ifdef GATHER_STATISTICS
/* Helper for qsort; sort descriptors by amount of memory consumed.  */
static int
cmp_statistic (const void *loc1, const void *loc2)
{
  const struct vec_descriptor *const l1 =
    *(const struct vec_descriptor *const *) loc1;
  const struct vec_descriptor *const l2 =
    *(const struct vec_descriptor *const *) loc2;
  long diff;
  diff = l1->allocated - l2->allocated;
  if (!diff)
    diff = l1->peak - l2->peak;
  if (!diff)
    diff = l1->times - l2->times;
  return diff > 0 ? 1 : diff < 0 ? -1 : 0;
}
/* Collect array of the descriptors from hashtable.  */
static struct vec_descriptor **loc_array;
static int
add_statistics (void **slot, void *b)
{
  int *n = (int *)b;
  loc_array[*n] = (struct vec_descriptor *) *slot;
  (*n)++;
  return 1;
}

/* Dump per-site memory statistics.  */
#endif
void
dump_vec_loc_statistics (void)
{
#ifdef GATHER_STATISTICS
  int nentries = 0;
  char s[4096];
  size_t allocated = 0;
  size_t times = 0;
  int i;

  loc_array = XCNEWVEC (struct vec_descriptor *, vec_desc_hash->n_elements);
  fprintf (stderr, "Heap vectors:\n");
  fprintf (stderr, "\n%-48s %10s       %10s       %10s\n",
	   "source location", "Leak", "Peak", "Times");
  fprintf (stderr, "-------------------------------------------------------\n");
  htab_traverse (vec_desc_hash, add_statistics, &nentries);
  qsort (loc_array, nentries, sizeof (*loc_array), cmp_statistic);
  for (i = 0; i < nentries; i++)
    {
      struct vec_descriptor *d = loc_array[i];
      allocated += d->allocated;
      times += d->times;
    }
  for (i = 0; i < nentries; i++)
    {
      struct vec_descriptor *d = loc_array[i];
      const char *s1 = d->file;
      const char *s2;
      while ((s2 = strstr (s1, "gcc/")))
	s1 = s2 + 4;
      sprintf (s, "%s:%i (%s)", s1, d->line, d->function);
      s[48] = 0;
      fprintf (stderr, "%-48s %10li:%4.1f%% %10li      %10li:%4.1f%% \n", s,
	       (long)d->allocated,
	       (d->allocated) * 100.0 / allocated,
	       (long)d->peak,
	       (long)d->times,
	       (d->times) * 100.0 / times);
    }
  fprintf (stderr, "%-48s %10ld                        %10ld\n",
	   "Total", (long)allocated, (long)times);
  fprintf (stderr, "\n%-48s %10s       %10s       %10s\n",
	   "source location", "Leak", "Peak", "Times");
  fprintf (stderr, "-------------------------------------------------------\n");
#endif
}