aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/clang14-rt/lib/profile/InstrProfilingUtil.c
blob: 33dcdd3c2f995c8bc4d0cfdb70c4f33684d7ddf0 (plain) (blame)
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
/*===- InstrProfilingUtil.c - Support library for PGO instrumentation -----===*\
|*
|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|* See https://llvm.org/LICENSE.txt for license information.
|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|*
\*===----------------------------------------------------------------------===*/

#ifdef _WIN32
#include <direct.h>
#include <process.h>
#include <windows.h>
#include "WindowsMMap.h"
#else
#include <errno.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#endif

#ifdef COMPILER_RT_HAS_UNAME
#include <sys/utsname.h>
#endif

#include <stdlib.h>
#include <string.h>

#if defined(__linux__)
#include <signal.h>
#include <sys/prctl.h>
#endif

#if defined(__Fuchsia__)
#error #include <zircon/process.h>
#error #include <zircon/syscalls.h>
#endif

#if defined(__FreeBSD__)
#include <signal.h>
#error #include <sys/procctl.h>
#endif

#include "InstrProfiling.h"
#include "InstrProfilingUtil.h"

COMPILER_RT_WEAK unsigned lprofDirMode = 0755;

COMPILER_RT_VISIBILITY
void __llvm_profile_recursive_mkdir(char *path) {
  int i;
  int start = 1;

#if defined(__ANDROID__) && defined(__ANDROID_API__) &&                        \
    defined(__ANDROID_API_FUTURE__) &&                                         \
    __ANDROID_API__ == __ANDROID_API_FUTURE__
  // Avoid spammy selinux denial messages in Android by not attempting to
  // create directories in GCOV_PREFIX.  These denials occur when creating (or
  // even attempting to stat()) top-level directories like "/data".
  //
  // Do so by ignoring ${GCOV_PREFIX} when invoking mkdir().
  const char *gcov_prefix = getenv("GCOV_PREFIX");
  if (gcov_prefix != NULL) {
    const int gcov_prefix_len = strlen(gcov_prefix);
    if (strncmp(path, gcov_prefix, gcov_prefix_len) == 0)
      start = gcov_prefix_len;
  }
#endif

  for (i = start; path[i] != '\0'; ++i) {
    char save = path[i];
    if (!IS_DIR_SEPARATOR(path[i]))
      continue;
    path[i] = '\0';
#ifdef _WIN32
    _mkdir(path);
#else
    /* Some of these will fail, ignore it. */
    mkdir(path, __llvm_profile_get_dir_mode());
#endif
    path[i] = save;
  }
}

COMPILER_RT_VISIBILITY
void __llvm_profile_set_dir_mode(unsigned Mode) { lprofDirMode = Mode; }

COMPILER_RT_VISIBILITY
unsigned __llvm_profile_get_dir_mode(void) { return lprofDirMode; }

#if COMPILER_RT_HAS_ATOMICS != 1
COMPILER_RT_VISIBILITY
uint32_t lprofBoolCmpXchg(void **Ptr, void *OldV, void *NewV) {
  void *R = *Ptr;
  if (R == OldV) {
    *Ptr = NewV;
    return 1;
  }
  return 0;
}
COMPILER_RT_VISIBILITY
void *lprofPtrFetchAdd(void **Mem, long ByteIncr) {
  void *Old = *Mem;
  *((char **)Mem) += ByteIncr;
  return Old;
}

#endif

#ifdef _WIN32
COMPILER_RT_VISIBILITY int lprofGetHostName(char *Name, int Len) {
  WCHAR Buffer[COMPILER_RT_MAX_HOSTLEN];
  DWORD BufferSize = sizeof(Buffer);
  BOOL Result =
      GetComputerNameExW(ComputerNameDnsFullyQualified, Buffer, &BufferSize);
  if (!Result)
    return -1;
  if (WideCharToMultiByte(CP_UTF8, 0, Buffer, -1, Name, Len, NULL, NULL) == 0)
    return -1;
  return 0;
}
#elif defined(COMPILER_RT_HAS_UNAME)
COMPILER_RT_VISIBILITY int lprofGetHostName(char *Name, int Len) {
  struct utsname N;
  int R = uname(&N);
  if (R >= 0) {
    strncpy(Name, N.nodename, Len);
    return 0;
  }
  return R;
}
#endif

COMPILER_RT_VISIBILITY int lprofLockFd(int fd) {
#ifdef COMPILER_RT_HAS_FCNTL_LCK
  struct flock s_flock;

  s_flock.l_whence = SEEK_SET;
  s_flock.l_start = 0;
  s_flock.l_len = 0; /* Until EOF.  */
  s_flock.l_pid = getpid();
  s_flock.l_type = F_WRLCK;

  while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
    if (errno != EINTR) {
      if (errno == ENOLCK) {
        return -1;
      }
      break;
    }
  }
  return 0;
#else
  flock(fd, LOCK_EX);
  return 0;
#endif
}

COMPILER_RT_VISIBILITY int lprofUnlockFd(int fd) {
#ifdef COMPILER_RT_HAS_FCNTL_LCK
  struct flock s_flock;

  s_flock.l_whence = SEEK_SET;
  s_flock.l_start = 0;
  s_flock.l_len = 0; /* Until EOF.  */
  s_flock.l_pid = getpid();
  s_flock.l_type = F_UNLCK;

  while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
    if (errno != EINTR) {
      if (errno == ENOLCK) {
        return -1;
      }
      break;
    }
  }
  return 0;
#else
  flock(fd, LOCK_UN);
  return 0;
#endif
}

COMPILER_RT_VISIBILITY int lprofLockFileHandle(FILE *F) {
  int fd;
#if defined(_WIN32)
  fd = _fileno(F);
#else
  fd = fileno(F);
#endif
  return lprofLockFd(fd);
}

COMPILER_RT_VISIBILITY int lprofUnlockFileHandle(FILE *F) {
  int fd;
#if defined(_WIN32)
  fd = _fileno(F);
#else
  fd = fileno(F);
#endif
  return lprofUnlockFd(fd);
}

COMPILER_RT_VISIBILITY FILE *lprofOpenFileEx(const char *ProfileName) {
  FILE *f;
  int fd;
#ifdef COMPILER_RT_HAS_FCNTL_LCK
  fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
  if (fd < 0)
    return NULL;

  if (lprofLockFd(fd) != 0)
    PROF_WARN("Data may be corrupted during profile merging : %s\n",
              "Fail to obtain file lock due to system limit.");

  f = fdopen(fd, "r+b");
#elif defined(_WIN32)
  // FIXME: Use the wide variants to handle Unicode filenames.
  HANDLE h = CreateFileA(ProfileName, GENERIC_READ | GENERIC_WRITE,
                         FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_ALWAYS,
                         FILE_ATTRIBUTE_NORMAL, 0);
  if (h == INVALID_HANDLE_VALUE)
    return NULL;

  fd = _open_osfhandle((intptr_t)h, 0);
  if (fd == -1) {
    CloseHandle(h);
    return NULL;
  }

  if (lprofLockFd(fd) != 0)
    PROF_WARN("Data may be corrupted during profile merging : %s\n",
              "Fail to obtain file lock due to system limit.");

  f = _fdopen(fd, "r+b");
  if (f == 0) {
    CloseHandle(h);
    return NULL;
  }
#else
  /* Worst case no locking applied.  */
  PROF_WARN("Concurrent file access is not supported : %s\n",
            "lack file locking");
  fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
  if (fd < 0)
    return NULL;
  f = fdopen(fd, "r+b");
#endif

  return f;
}

COMPILER_RT_VISIBILITY const char *lprofGetPathPrefix(int *PrefixStrip,
                                                      size_t *PrefixLen) {
  const char *Prefix = getenv("GCOV_PREFIX");
  const char *PrefixStripStr = getenv("GCOV_PREFIX_STRIP");

  *PrefixLen = 0;
  *PrefixStrip = 0;
  if (Prefix == NULL || Prefix[0] == '\0')
    return NULL;

  if (PrefixStripStr) {
    *PrefixStrip = atoi(PrefixStripStr);

    /* Negative GCOV_PREFIX_STRIP values are ignored */
    if (*PrefixStrip < 0)
      *PrefixStrip = 0;
  } else {
    *PrefixStrip = 0;
  }
  *PrefixLen = strlen(Prefix);

  return Prefix;
}

COMPILER_RT_VISIBILITY void
lprofApplyPathPrefix(char *Dest, const char *PathStr, const char *Prefix,
                     size_t PrefixLen, int PrefixStrip) {

  const char *Ptr;
  int Level;
  const char *StrippedPathStr = PathStr;

  for (Level = 0, Ptr = PathStr + 1; Level < PrefixStrip; ++Ptr) {
    if (*Ptr == '\0')
      break;

    if (!IS_DIR_SEPARATOR(*Ptr))
      continue;

    StrippedPathStr = Ptr;
    ++Level;
  }

  memcpy(Dest, Prefix, PrefixLen);

  if (!IS_DIR_SEPARATOR(Prefix[PrefixLen - 1]))
    Dest[PrefixLen++] = DIR_SEPARATOR;

  memcpy(Dest + PrefixLen, StrippedPathStr, strlen(StrippedPathStr) + 1);
}

COMPILER_RT_VISIBILITY const char *
lprofFindFirstDirSeparator(const char *Path) {
  const char *Sep = strchr(Path, DIR_SEPARATOR);
#if defined(DIR_SEPARATOR_2)
  const char *Sep2 = strchr(Path, DIR_SEPARATOR_2);
  if (Sep2 && (!Sep || Sep2 < Sep))
    Sep = Sep2;
#endif
  return Sep;
}

COMPILER_RT_VISIBILITY const char *lprofFindLastDirSeparator(const char *Path) {
  const char *Sep = strrchr(Path, DIR_SEPARATOR);
#if defined(DIR_SEPARATOR_2)
  const char *Sep2 = strrchr(Path, DIR_SEPARATOR_2);
  if (Sep2 && (!Sep || Sep2 > Sep))
    Sep = Sep2;
#endif
  return Sep;
}

COMPILER_RT_VISIBILITY int lprofSuspendSigKill() {
#if defined(__linux__)
  int PDeachSig = 0;
  /* Temporarily suspend getting SIGKILL upon exit of the parent process. */
  if (prctl(PR_GET_PDEATHSIG, &PDeachSig) == 0 && PDeachSig == SIGKILL)
    prctl(PR_SET_PDEATHSIG, 0);
  return (PDeachSig == SIGKILL);
#elif defined(__FreeBSD__)
  int PDeachSig = 0, PDisableSig = 0;
  if (procctl(P_PID, 0, PROC_PDEATHSIG_STATUS, &PDeachSig) == 0 &&
      PDeachSig == SIGKILL)
    procctl(P_PID, 0, PROC_PDEATHSIG_CTL, &PDisableSig);
  return (PDeachSig == SIGKILL);
#else
  return 0;
#endif
}

COMPILER_RT_VISIBILITY void lprofRestoreSigKill() {
#if defined(__linux__)
  prctl(PR_SET_PDEATHSIG, SIGKILL);
#elif defined(__FreeBSD__)
  int PEnableSig = SIGKILL;
  procctl(P_PID, 0, PROC_PDEATHSIG_CTL, &PEnableSig);
#endif
}

COMPILER_RT_VISIBILITY int lprofReleaseMemoryPagesToOS(uintptr_t Begin,
                                                       uintptr_t End) {
#if defined(__ve__)
  // VE doesn't support madvise.
  return 0;
#else
  size_t PageSize = getpagesize();
  uintptr_t BeginAligned = lprofRoundUpTo((uintptr_t)Begin, PageSize);
  uintptr_t EndAligned = lprofRoundDownTo((uintptr_t)End, PageSize);
  if (BeginAligned < EndAligned) {
#if defined(__Fuchsia__)
    return _zx_vmar_op_range(_zx_vmar_root_self(), ZX_VMAR_OP_DECOMMIT,
                             (zx_vaddr_t)BeginAligned,
                             EndAligned - BeginAligned, NULL, 0);
#else
    return madvise((void *)BeginAligned, EndAligned - BeginAligned,
                   MADV_DONTNEED);
#endif
  }
  return 0;
#endif
}