summaryrefslogtreecommitdiff
path: root/gcc/vec.c
blob: bd0af2dc4ed00db961444750ac924efa8271bdba (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
/* Vector API for GNU compiler.
   Copyright (C) 2004-2014 Free Software Foundation, Inc.
   Contributed by Nathan Sidwell <nathan@codesourcery.com>
   Re-implemented in C++ by Diego Novillo <dnovillo@google.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 "coretypes.h"
#include "ggc.h"
#include "vec.h"
#include "diagnostic-core.h"
#include "hashtab.h"

/* vNULL is an empty type with a template cast operation that returns
   a zero-initialized vec<T, A, L> instance.  Use this when you want
   to assign nil values to new vec instances or pass a nil vector as
   a function call argument.

   We use this technique because vec<T, A, L> must be PODs (they are
   stored in unions and passed in vararg functions), this means that
   they cannot have ctors/dtors.  */
vnull vNULL;


/* 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.  */

void
vec_prefix::register_overhead (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 = this;
  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, this, htab_hash_pointer (this),
				   INSERT);
  gcc_assert (!*slot);
  *slot = p;

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


/* Notice that the memory allocated for the vector has been freed.  */

void
vec_prefix::release_overhead (void)
{
  PTR *slot = htab_find_slot_with_hash (ptr_hash, this,
					htab_hash_pointer (this),
					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);
}


/* Calculate the number of slots to reserve a vector, making sure that
   RESERVE slots are free.  If EXACT grow exactly, otherwise grow
   exponentially.  PFX is the control data for the vector.  */

unsigned
vec_prefix::calculate_allocation (vec_prefix *pfx, unsigned reserve,
				  bool exact)
{
  unsigned alloc = 0;
  unsigned num = 0;

  if (pfx)
    {
      alloc = pfx->m_alloc;
      num = pfx->m_num;
    }
  else if (!reserve)
    gcc_unreachable ();

  /* We must have run out of room.  */
  gcc_assert (alloc - num < 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;
}


/* 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.  */

void
dump_vec_loc_statistics (void)
{
  int nentries = 0;
  char s[4096];
  size_t allocated = 0;
  size_t times = 0;
  int i;

  if (! GATHER_STATISTICS)
    return;

  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");
}