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d4d9c257e0
Add support for switch and indirectbr edges. This works by densely numbering all blocks which have such terminators, and then separately numbering the possible successors. The predecessors write down a number, the successor knows its own number (as a ConstantInt) and sends that and the pointer to the number the predecessor wrote down to the runtime, who looks up the counter in a per-function table. Coverage data should now be functional, but I haven't tested it on anything other than my 2-file synthetic test program for coverage. llvm-svn: 130186
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*===- GCDAProfiling.c - Support library for GCDA file emission -----------===*\
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|*
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|* The LLVM Compiler Infrastructure
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|*
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|* This file is distributed under the University of Illinois Open Source
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|* License. See LICENSE.TXT for details.
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|*
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|*===----------------------------------------------------------------------===*|
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|*
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|* This file implements the call back routines for the gcov profiling
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|* instrumentation pass. Link against this library when running code through
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|* the -insert-gcov-profiling LLVM pass.
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|*
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|* We emit files in a corrupt version of GCOV's "gcda" file format. These files
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|* are only close enough that LCOV will happily parse them. Anything that lcov
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|* ignores is missing.
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|*
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|* TODO: gcov is multi-process safe by having each exit open the existing file
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|* and append to it. We'd like to achieve that and be thread-safe too.
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|*
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\*===----------------------------------------------------------------------===*/
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#include "llvm/Support/DataTypes.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* #define DEBUG_GCDAPROFILING */
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/*
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* --- GCOV file format I/O primitives ---
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*/
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static FILE *output_file = NULL;
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static void write_int32(uint32_t i) {
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fwrite(&i, 4, 1, output_file);
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}
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static void write_int64(uint64_t i) {
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uint32_t lo, hi;
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lo = i >> 0;
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hi = i >> 32;
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write_int32(lo);
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write_int32(hi);
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}
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/*
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* --- LLVM line counter API ---
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*/
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/* A file in this case is a translation unit. Each .o file built with line
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* profiling enabled will emit to a different file. Only one file may be
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* started at a time.
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*/
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void llvm_gcda_start_file(const char *filename) {
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output_file = fopen(filename, "w+");
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/* gcda file, version 404*, stamp LLVM. */
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fwrite("adcg*404MVLL", 12, 1, output_file);
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#ifdef DEBUG_GCDAPROFILING
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printf("llvmgcda: [%s]\n", filename);
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#endif
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}
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/* Given an array of pointers to counters (counters), increment the n-th one,
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* where we're also given a pointer to n (predecessor).
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*/
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void llvm_gcda_increment_indirect_counter(uint32_t *predecessor,
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uint64_t **counters) {
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uint64_t *counter;
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if (*predecessor == 0xffffffff)
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return;
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/* Don't crash if the pred# is out of sync. This can happen due to threads,
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or because of a TODO in GCOVProfiling.cpp buildEdgeLookupTable(). */
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if ((counter = counters[*predecessor]))
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++*counter;
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#ifdef DEBUG_GCDAPROFILING
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else
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printf("llvmgcda: increment_indirect_counter counters=%x, pred=%u\n",
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state_table_row, *predecessor);
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#endif
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}
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void llvm_gcda_emit_function(uint32_t ident) {
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#ifdef DEBUG_GCDAPROFILING
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printf("llvmgcda: function id=%x\n", ident);
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#endif
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/* function tag */
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fwrite("\0\0\0\1", 4, 1, output_file);
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write_int32(2);
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write_int32(ident);
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write_int32(0);
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}
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void llvm_gcda_emit_arcs(uint32_t num_counters, uint64_t *counters) {
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uint32_t i;
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/* counter #1 (arcs) tag */
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fwrite("\0\0\xa1\1", 4, 1, output_file);
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write_int32(num_counters * 2);
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for (i = 0; i < num_counters; ++i) {
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write_int64(counters[i]);
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}
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#ifdef DEBUG_GCDAPROFILING
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printf("llvmgcda: %u arcs\n", num_counters);
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for (i = 0; i < num_counters; ++i) {
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printf("llvmgcda: %llu\n", (unsigned long long)counters[i]);
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}
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#endif
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}
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void llvm_gcda_end_file() {
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/* Write out EOF record. */
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fwrite("\0\0\0\0\0\0\0\0", 8, 1, output_file);
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fclose(output_file);
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output_file = NULL;
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#ifdef DEBUG_GCDAPROFILING
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printf("llvmgcda: -----\n");
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#endif
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}
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