1 /*===- GCDAProfiling.c - Support library for GCDA file emission -----------===*\
8 |*===----------------------------------------------------------------------===*|
10 |* This file implements the call back routines for the gcov profiling
12 |* the -insert-gcov-profiling LLVM pass.
14 |* We emit files in a corrupt version of GCOV's "gcda" file format. These files
18 |* TODO: gcov is multi-process safe by having each exit open the existing file
19 |* and append to it. We'd like to achieve that and be thread-safe too.
21 \*===----------------------------------------------------------------------===*/
54  * FreeBSD 10, r232261) when compiled in 32-bit mode.
64  * --- GCOV file format I/O primitives ---
86 static int fd = -1;
118   size = (size - 1) / WRITE_BUFFER_SIZE + 1;  in resize_write_buffer()
131   write_bytes((char*)&i, 4);  in write_32bit_value()
139   return (strlen(s) / 4) + 1;  in length_of_string()
146   write_bytes("\0\0\0\0", 4 - (strlen(s) % 4));  in write_string()
153     return (uint32_t)-1;  in read_32bit_value()
156   cur_pos += 4;  in read_32bit_value()
164     return (uint64_t)-1;  in read_64bit_value()
208   if (prefix[prefix_len - 1] != '/')  in mangle_filename()
222     return -1;  in map_file()
226   if (write_buffer == (void *)-1) {  in map_file()
230     return -1;  in map_file()
236   if (msync(write_buffer, file_size, MS_SYNC) == -1) {  in unmap_file()
251  * --- LLVM line counter API ---
258 void llvm_gcda_start_file(const char *orig_filename, const char version[4],  in llvm_gcda_start_file()  argument
267   if (fd == -1) {  in llvm_gcda_start_file()
272     if (fd == -1) {  in llvm_gcda_start_file()
276       if (fd == -1) {  in llvm_gcda_start_file()
302     if (map_file() == -1) {  in llvm_gcda_start_file()
313   write_bytes("adcg", 4);  in llvm_gcda_start_file()
314   write_bytes(version, 4);  in llvm_gcda_start_file()
322 /* Given an array of pointers to counters (counters), increment the n-th one,
361   write_bytes("\0\0\0\1", 4);  in llvm_gcda_emit_function()
383   if (val != (uint32_t)-1) {  in llvm_gcda_emit_arcs()
393     if (val == (uint32_t)-1 || val / 2 != num_counters) {  in llvm_gcda_emit_arcs()
408   write_bytes("\0\0\xa1\1", 4);  in llvm_gcda_emit_arcs()
425   const uint32_t obj_summary_len = 9; /* Length for gcov compatibility. */  in llvm_gcda_summary_info()
435   if (val != (uint32_t)-1) {  in llvm_gcda_summary_info()
460   write_bytes("\0\0\0\xa1", 4);  in llvm_gcda_summary_info()
469   write_bytes("\0\0\0\xa3", 4); /* tag indicates 1 program */  in llvm_gcda_summary_info()
497   fprintf(stderr, "llvmgcda: -----\n");  in llvm_gcda_end_file()
503   new_node->fn = fn;  in llvm_register_writeout_function()
504   new_node->next = NULL;  in llvm_register_writeout_function()
509     writeout_fn_tail->next = new_node;  in llvm_register_writeout_function()
518     curr->fn();  in llvm_writeout_files()
519     curr = curr->next;  in llvm_writeout_files()
526     writeout_fn_head = writeout_fn_head->next;  in llvm_delete_writeout_function_list()
535   new_node->fn = fn;  in llvm_register_flush_function()
536   new_node->next = NULL;  in llvm_register_flush_function()
541     flush_fn_tail->next = new_node;  in llvm_register_flush_function()
550     curr->fn();  in __gcov_flush()
551     curr = curr->next;  in __gcov_flush()
558     flush_fn_head = flush_fn_head->next;  in llvm_delete_flush_function_list()