/* 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;
}
/* Returns 0 (size) when an error occurs. */
uint64_t libEntry(char *Buffer, uint64_t MaxSize) {
uint64_t Size = __llvm_profile_get_size_for_buffer();
if (Size > MaxSize)
return 0;
__llvm_profile_reset_counters();
bar('1');
if (__llvm_profile_write_buffer(Buffer))
return 0;
/* Now check compatibility. Should return 0. */
if (__llvm_profile_check_compatibility(Buffer, Size))
return 0;
return Size;
}
