/* A file in this case is a translation unit. Each .o file built with line
* profiling enabled will emit to a different file. Only one file may be
* started at a time.
*/
void llvm_gcda_start_file(const char *orig_filename, const char version[4],
uint32_t checksum) {
const char *mode = "r+b";
filename = mangle_filename(orig_filename);
/* Try just opening the file. */
new_file = 0;
fd = open(filename, O_RDWR);
if (fd == -1) {
/* Try opening the file, creating it if necessary. */
new_file = 1;
mode = "w+b";
fd = open(filename, O_RDWR | O_CREAT, 0644);
if (fd == -1) {
/* Try creating the directories first then opening the file. */
recursive_mkdir(filename);
fd = open(filename, O_RDWR | O_CREAT, 0644);
if (fd == -1) {
/* Bah! It's hopeless. */
int errnum = errno;
fprintf(stderr, "profiling: %s: cannot open: %s\n", filename,
strerror(errnum));
return;
}
}
}
output_file = fdopen(fd, mode);
/* Initialize the write buffer. */
write_buffer = NULL;
cur_buffer_size = 0;
cur_pos = 0;
if (new_file) {
resize_write_buffer(WRITE_BUFFER_SIZE);
memset(write_buffer, 0, WRITE_BUFFER_SIZE);
} else {
if (map_file() == -1) {
/* mmap failed, try to recover by clobbering */
new_file = 1;
write_buffer = NULL;
cur_buffer_size = 0;
resize_write_buffer(WRITE_BUFFER_SIZE);
memset(write_buffer, 0, WRITE_BUFFER_SIZE);
}
}
/* gcda file, version, stamp checksum. */
write_bytes("adcg", 4);
write_bytes(version, 4);
write_32bit_value(checksum);
#ifdef DEBUG_GCDAPROFILING
fprintf(stderr, "llvmgcda: [%s]\n", orig_filename);
#endif
}
static void write_bytes(const char *s, size_t len) {
resize_write_buffer(len);
memcpy(&write_buffer[cur_pos], s, len);
cur_pos += len;
}
/* A file in this case is a translation unit. Each .o file built with line
* profiling enabled will emit to a different file. Only one file may be
* started at a time.
*/
void llvm_gcda_start_file(const char *orig_filename, const char version[4],
uint32_t checksum) {
const char *mode = "r+b";
filename = mangle_filename(orig_filename);
/* Try just opening the file. */
new_file = 0;
fd = open(filename, O_RDWR);
if (fd == -1) {
/* Try opening the file, creating it if necessary. */
new_file = 1;
mode = "w+b";
fd = open(filename, O_RDWR | O_CREAT, 0644);
if (fd == -1) {
/* Try creating the directories first then opening the file. */
__llvm_profile_recursive_mkdir(filename);
fd = open(filename, O_RDWR | O_CREAT, 0644);
if (fd == -1) {
/* Bah! It's hopeless. */
int errnum = errno;
fprintf(stderr, "profiling: %s: cannot open: %s\n", filename,
strerror(errnum));
return;
}
}
}
/* Try to flock the file to serialize concurrent processes writing out to the
* same GCDA. This can fail if the filesystem doesn't support it, but in that
* case we'll just carry on with the old racy behaviour and hope for the best.
*/
flock(fd, LOCK_EX);
output_file = fdopen(fd, mode);
/* Initialize the write buffer. */
write_buffer = NULL;
cur_buffer_size = 0;
cur_pos = 0;
if (new_file) {
resize_write_buffer(WRITE_BUFFER_SIZE);
memset(write_buffer, 0, WRITE_BUFFER_SIZE);
} else {
if (map_file() == -1) {
/* mmap failed, try to recover by clobbering */
new_file = 1;
write_buffer = NULL;
cur_buffer_size = 0;
resize_write_buffer(WRITE_BUFFER_SIZE);
memset(write_buffer, 0, WRITE_BUFFER_SIZE);
}
}
/* gcda file, version, stamp checksum. */
write_bytes("adcg", 4);
write_bytes(version, 4);
write_32bit_value(checksum);
#ifdef DEBUG_GCDAPROFILING
fprintf(stderr, "llvmgcda: [%s]\n", orig_filename);
#endif
}
