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|
/*===- GCDAProfiling.c - Support library for GCDA file emission -----------===*\
|*
|* The LLVM Compiler Infrastructure
|*
|* This file is distributed under the University of Illinois Open Source
|* License. See LICENSE.TXT for details.
|*
|*===----------------------------------------------------------------------===*|
|*
|* This file implements the call back routines for the gcov profiling
|* instrumentation pass. Link against this library when running code through
|* the -insert-gcov-profiling LLVM pass.
|*
|* We emit files in a corrupt version of GCOV's "gcda" file format. These files
|* are only close enough that LCOV will happily parse them. Anything that lcov
|* ignores is missing.
|*
|* TODO: gcov is multi-process safe by having each exit open the existing file
|* and append to it. We'd like to achieve that and be thread-safe too.
|*
\*===----------------------------------------------------------------------===*/
#include "llvm/Support/DataTypes.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* #define DEBUG_GCDAPROFILING */
/*
* --- GCOV file format I/O primitives ---
*/
static FILE *output_file = NULL;
static void write_int32(uint32_t i) {
fwrite(&i, 4, 1, output_file);
}
static void write_int64(uint64_t i) {
uint32_t lo, hi;
lo = i >> 0;
hi = i >> 32;
write_int32(lo);
write_int32(hi);
}
/*
* --- LLVM line counter API ---
*/
/* 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 *filename) {
output_file = fopen(filename, "w+");
/* gcda file, version 404*, stamp LLVM. */
fwrite("adcg*404MVLL", 12, 1, output_file);
#ifdef DEBUG_GCDAPROFILING
printf("llvmgcda: [%s]\n", filename);
#endif
}
/* Given an array of pointers to counters (counters), increment the n-th one,
* where we're also given a pointer to n (predecessor).
*/
void llvm_gcda_increment_indirect_counter(uint32_t *predecessor,
uint64_t **counters) {
uint64_t *counter;
if (*predecessor == 0xffffffff)
return;
/* Don't crash if the pred# is out of sync. This can happen due to threads,
or because of a TODO in GCOVProfiling.cpp buildEdgeLookupTable(). */
if ((counter = counters[*predecessor]))
++*counter;
#ifdef DEBUG_GCDAPROFILING
else
printf("llvmgcda: increment_indirect_counter counters=%x, pred=%u\n",
state_table_row, *predecessor);
#endif
}
void llvm_gcda_emit_function(uint32_t ident) {
#ifdef DEBUG_GCDAPROFILING
printf("llvmgcda: function id=%x\n", ident);
#endif
/* function tag */
fwrite("\0\0\0\1", 4, 1, output_file);
write_int32(2);
write_int32(ident);
write_int32(0);
}
void llvm_gcda_emit_arcs(uint32_t num_counters, uint64_t *counters) {
uint32_t i;
/* counter #1 (arcs) tag */
fwrite("\0\0\xa1\1", 4, 1, output_file);
write_int32(num_counters * 2);
for (i = 0; i < num_counters; ++i) {
write_int64(counters[i]);
}
#ifdef DEBUG_GCDAPROFILING
printf("llvmgcda: %u arcs\n", num_counters);
for (i = 0; i < num_counters; ++i) {
printf("llvmgcda: %llu\n", (unsigned long long)counters[i]);
}
#endif
}
void llvm_gcda_end_file() {
/* Write out EOF record. */
fwrite("\0\0\0\0\0\0\0\0", 8, 1, output_file);
fclose(output_file);
output_file = NULL;
#ifdef DEBUG_GCDAPROFILING
printf("llvmgcda: -----\n");
#endif
}
|
