aboutsummaryrefslogtreecommitdiff
path: root/libgcc/libgcov-interface.c
blob: 61089e970064910fc91e8ab5d1b0019a16d0a3b6 (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
/* Routines required for instrumenting a program.  */
/* Compile this one with gcc.  */
/* Copyright (C) 1989-2017 Free Software Foundation, Inc.

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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "libgcov.h"
#include "gthr.h"

#if defined(inhibit_libc)

#ifdef L_gcov_flush
void __gcov_flush (void) {}
#endif

#ifdef L_gcov_reset
void __gcov_reset (void) {}
#endif

#ifdef L_gcov_dump
void __gcov_dump (void) {}
#endif

#else

/* Some functions we want to bind in this dynamic object, but have an
   overridable global alias.  Unfortunately not all targets support
   aliases, so we just have a forwarding function.  That'll be tail
   called, so the cost is a single jump instruction.*/

#define ALIAS_void_fn(src,dst) \
  void dst (void)	    \
  { src (); }

extern __gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN;
extern __gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN;

#ifdef L_gcov_flush
#ifdef __GTHREAD_MUTEX_INIT
__gthread_mutex_t __gcov_flush_mx = __GTHREAD_MUTEX_INIT;
#define init_mx_once()
#else
__gthread_mutex_t __gcov_flush_mx;

static void
init_mx (void)
{
  __GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx);
}

static void
init_mx_once (void)
{
  static __gthread_once_t once = __GTHREAD_ONCE_INIT;
  __gthread_once (&once, init_mx);
}
#endif

/* Called before fork or exec - write out profile information gathered so
   far and reset it to zero.  This avoids duplication or loss of the
   profile information gathered so far.  */

void
__gcov_flush (void)
{
  init_mx_once ();
  __gthread_mutex_lock (&__gcov_flush_mx);

  __gcov_dump_int ();
  __gcov_reset_int ();

  __gthread_mutex_unlock (&__gcov_flush_mx);
}

#endif /* L_gcov_flush */

#ifdef L_gcov_reset

/* Reset all counters to zero.  */

static void
gcov_clear (const struct gcov_info *list)
{
  const struct gcov_info *gi_ptr;

  for (gi_ptr = list; gi_ptr; gi_ptr = gi_ptr->next)
    {
      unsigned f_ix;

      for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)
        {
          unsigned t_ix;
          const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];

          if (!gfi_ptr || gfi_ptr->key != gi_ptr)
            continue;
          const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
          for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
            {
              if (!gi_ptr->merge[t_ix])
                continue;

              memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num);
              ci_ptr++;
            }
        }
    }
}

/* Function that can be called from application to reset counters to zero,
   in order to collect profile in region of interest.  */

void
__gcov_reset_int (void)
{
  struct gcov_root *root;

  /* If we're compatible with the master, iterate over everything,
     otherise just do us.  */
  for (root = __gcov_master.version == GCOV_VERSION
	 ? __gcov_master.root : &__gcov_root; root; root = root->next)
    {
      gcov_clear (root->list);
      root->dumped = 0;
    }
}

ALIAS_void_fn (__gcov_reset_int, __gcov_reset);

#endif /* L_gcov_reset */

#ifdef L_gcov_dump
/* Function that can be called from application to write profile collected
   so far, in order to collect profile in region of interest.  */

void
__gcov_dump_int (void)
{
  struct gcov_root *root;

  /* If we're compatible with the master, iterate over everything,
     otherise just do us.  */
  for (root = __gcov_master.version == GCOV_VERSION
	 ? __gcov_master.root : &__gcov_root; root; root = root->next)
    __gcov_dump_one (root);
}

ALIAS_void_fn (__gcov_dump_int, __gcov_dump);

#endif /* L_gcov_dump */

#ifdef L_gcov_fork
/* A wrapper for the fork function.  Flushes the accumulated profiling data, so
   that they are not counted twice.  */

pid_t
__gcov_fork (void)
{
  pid_t pid;
  __gcov_flush ();
  pid = fork ();
  if (pid == 0)
    __GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx);
  return pid;
}
#endif

#ifdef L_gcov_execl
/* A wrapper for the execl function.  Flushes the accumulated
   profiling data, so that they are not lost.  */

int
__gcov_execl (const char *path, char *arg, ...)
{
  va_list ap, aq;
  unsigned i, length;
  char **args;

  __gcov_flush ();

  va_start (ap, arg);
  va_copy (aq, ap);

  length = 2;
  while (va_arg (ap, char *))
    length++;
  va_end (ap);

  args = (char **) alloca (length * sizeof (void *));
  args[0] = arg;
  for (i = 1; i < length; i++)
    args[i] = va_arg (aq, char *);
  va_end (aq);

  return execv (path, args);
}
#endif

#ifdef L_gcov_execlp
/* A wrapper for the execlp function.  Flushes the accumulated
   profiling data, so that they are not lost.  */

int
__gcov_execlp (const char *path, char *arg, ...)
{
  va_list ap, aq;
  unsigned i, length;
  char **args;

  __gcov_flush ();

  va_start (ap, arg);
  va_copy (aq, ap);

  length = 2;
  while (va_arg (ap, char *))
    length++;
  va_end (ap);

  args = (char **) alloca (length * sizeof (void *));
  args[0] = arg;
  for (i = 1; i < length; i++)
    args[i] = va_arg (aq, char *);
  va_end (aq);

  return execvp (path, args);
}
#endif

#ifdef L_gcov_execle
/* A wrapper for the execle function.  Flushes the accumulated
   profiling data, so that they are not lost.  */

int
__gcov_execle (const char *path, char *arg, ...)
{
  va_list ap, aq;
  unsigned i, length;
  char **args;
  char **envp;

  __gcov_flush ();

  va_start (ap, arg);
  va_copy (aq, ap);

  length = 2;
  while (va_arg (ap, char *))
    length++;
  va_end (ap);

  args = (char **) alloca (length * sizeof (void *));
  args[0] = arg;
  for (i = 1; i < length; i++)
    args[i] = va_arg (aq, char *);
  envp = va_arg (aq, char **);
  va_end (aq);

  return execve (path, args, envp);
}
#endif

#ifdef L_gcov_execv
/* A wrapper for the execv function.  Flushes the accumulated
   profiling data, so that they are not lost.  */

int
__gcov_execv (const char *path, char *const argv[])
{
  __gcov_flush ();
  return execv (path, argv);
}
#endif

#ifdef L_gcov_execvp
/* A wrapper for the execvp function.  Flushes the accumulated
   profiling data, so that they are not lost.  */

int
__gcov_execvp (const char *path, char *const argv[])
{
  __gcov_flush ();
  return execvp (path, argv);
}
#endif

#ifdef L_gcov_execve
/* A wrapper for the execve function.  Flushes the accumulated
   profiling data, so that they are not lost.  */

int
__gcov_execve (const char *path, char *const argv[], char *const envp[])
{
  __gcov_flush ();
  return execve (path, argv, envp);
}
#endif
#endif /* inhibit_libc */