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/*===- InstrProfiling.c - Support library for PGO instrumentation ---------===*\
|*
|* The LLVM Compiler Infrastructure
|*
|* This file is distributed under the University of Illinois Open Source
|* License. See LICENSE.TXT for details.
|*
\*===----------------------------------------------------------------------===*/
#include "InstrProfiling.h"
#include <string.h>
/* TODO: void __llvm_profile_get_size_for_buffer(void); */
static uint64_t getMagic(void) {
return
(uint64_t)'l' << 56 |
(uint64_t)'p' << 48 |
(uint64_t)'r' << 40 |
(uint64_t)'o' << 32 |
(uint64_t)'f' << 24 |
(uint64_t)'r' << 16 |
(uint64_t)'a' << 8 |
(uint64_t)'w';
}
static uint64_t getVersion(void) {
return 1;
}
int __llvm_profile_write_buffer(FILE *OutputFile) {
/* TODO: Requires libc: break requirement by taking a char* buffer instead of
* a FILE stream.
*/
const __llvm_profile_data *DataBegin = __llvm_profile_data_begin();
const __llvm_profile_data *DataEnd = __llvm_profile_data_end();
const uint64_t *CountersBegin = __llvm_profile_counters_begin();
const uint64_t *CountersEnd = __llvm_profile_counters_end();
const char *NamesBegin = __llvm_profile_names_begin();
const char *NamesEnd = __llvm_profile_names_end();
/* Calculate size of sections. */
const uint64_t DataSize = DataEnd - DataBegin;
const uint64_t CountersSize = CountersEnd - CountersBegin;
const uint64_t NamesSize = NamesEnd - NamesBegin;
/* Get rest of header data. */
const uint64_t Magic = getMagic();
const uint64_t Version = getVersion();
const uint64_t CountersDelta = (uint64_t)CountersBegin;
const uint64_t NamesDelta = (uint64_t)NamesBegin;
#define CHECK_fwrite(Data, Size, Length, File) \
do { if (fwrite(Data, Size, Length, File) != Length) return -1; } while (0)
/* Write the header. */
CHECK_fwrite(&Magic, sizeof(uint64_t), 1, OutputFile);
CHECK_fwrite(&Version, sizeof(uint64_t), 1, OutputFile);
CHECK_fwrite(&DataSize, sizeof(uint64_t), 1, OutputFile);
CHECK_fwrite(&CountersSize, sizeof(uint64_t), 1, OutputFile);
CHECK_fwrite(&NamesSize, sizeof(uint64_t), 1, OutputFile);
CHECK_fwrite(&CountersDelta, sizeof(uint64_t), 1, OutputFile);
CHECK_fwrite(&NamesDelta, sizeof(uint64_t), 1, OutputFile);
/* Write the data. */
CHECK_fwrite(DataBegin, sizeof(__llvm_profile_data), DataSize, OutputFile);
CHECK_fwrite(CountersBegin, sizeof(uint64_t), CountersSize, OutputFile);
CHECK_fwrite(NamesBegin, sizeof(char), NamesSize, OutputFile);
#undef CHECK_fwrite
return 0;
}
void __llvm_profile_reset_counters(void) {
uint64_t *I = __llvm_profile_counters_begin();
uint64_t *E = __llvm_profile_counters_end();
memset(I, 0, sizeof(uint64_t)*(E - I));
}
|
