COMPILER_RT_VISIBILITY FILE *lprofOpenFileEx(const char *ProfileName) {
FILE *f;
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;
fd = open(ProfileName, O_RDWR | O_CREAT, 0666);
if (fd < 0)
return NULL;
while (fcntl(fd, F_SETLKW, &s_flock) == -1) {
if (errno != EINTR) {
if (errno == ENOLCK) {
PROF_WARN("Data may be corrupted during profile merging : %s\n",
"Fail to obtain file lock due to system limit.");
}
break;
}
}
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, 0, 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;
}
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;
}
/* Parses the pattern string \p FilenamePat and stores the result to
* lprofcurFilename structure. */
static int parseFilenamePattern(const char *FilenamePat) {
int NumPids = 0, NumHosts = 0, I;
char *PidChars = &lprofCurFilename.PidChars[0];
char *Hostname = &lprofCurFilename.Hostname[0];
int MergingEnabled = 0;
lprofCurFilename.FilenamePat = FilenamePat;
/* Check the filename for "%p", which indicates a pid-substitution. */
for (I = 0; FilenamePat[I]; ++I)
if (FilenamePat[I] == '%') {
if (FilenamePat[++I] == 'p') {
if (!NumPids++) {
if (snprintf(PidChars, MAX_PID_SIZE, "%d", getpid()) <= 0) {
PROF_WARN(
"Unable to parse filename pattern %s. Using the default name.",
FilenamePat);
return -1;
}
}
} else if (FilenamePat[I] == 'h') {
if (!NumHosts++)
if (COMPILER_RT_GETHOSTNAME(Hostname, COMPILER_RT_MAX_HOSTLEN)) {
PROF_WARN(
"Unable to parse filename pattern %s. Using the default name.",
FilenamePat);
return -1;
}
} else if (containsMergeSpecifier(FilenamePat, I)) {
if (MergingEnabled) {
PROF_WARN(
"%%m specifier can only be specified once at the end of %s.\n",
FilenamePat);
return -1;
}
MergingEnabled = 1;
if (FilenamePat[I] == 'm')
lprofCurFilename.MergePoolSize = 1;
else {
lprofCurFilename.MergePoolSize = FilenamePat[I] - '0';
I++; /* advance to 'm' */
}
}
}
lprofCurFilename.NumPids = NumPids;
lprofCurFilename.NumHosts = NumHosts;
return 0;
}
/* Read profile data in \c ProfileFile and merge with in-memory
profile counters. Returns -1 if there is fatal error, otheriwse
0 is returned.
*/
static int doProfileMerging(FILE *ProfileFile) {
uint64_t ProfileFileSize;
char *ProfileBuffer;
if (fseek(ProfileFile, 0L, SEEK_END) == -1) {
PROF_ERR("Unable to merge profile data, unable to get size: %s\n",
strerror(errno));
return -1;
}
ProfileFileSize = ftell(ProfileFile);
/* Restore file offset. */
if (fseek(ProfileFile, 0L, SEEK_SET) == -1) {
PROF_ERR("Unable to merge profile data, unable to rewind: %s\n",
strerror(errno));
return -1;
}
/* Nothing to merge. */
if (ProfileFileSize < sizeof(__llvm_profile_header)) {
if (ProfileFileSize)
PROF_WARN("Unable to merge profile data: %s\n",
"source profile file is too small.");
return 0;
}
ProfileBuffer = mmap(NULL, ProfileFileSize, PROT_READ, MAP_SHARED | MAP_FILE,
fileno(ProfileFile), 0);
if (ProfileBuffer == MAP_FAILED) {
PROF_ERR("Unable to merge profile data, mmap failed: %s\n",
strerror(errno));
return -1;
}
if (__llvm_profile_check_compatibility(ProfileBuffer, ProfileFileSize)) {
(void)munmap(ProfileBuffer, ProfileFileSize);
PROF_WARN("Unable to merge profile data: %s\n",
"source profile file is not compatible.");
return 0;
}
/* Now start merging */
__llvm_profile_merge_from_buffer(ProfileBuffer, ProfileFileSize);
(void)munmap(ProfileBuffer, ProfileFileSize);
return 0;
}
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, 0, 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;
}
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;
}