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|
/*===- InstrProfilingWriter.c - Write instrumentation to a file or buffer -===*\
|*
|* 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 "InstrProfilingInternal.h"
#include <string.h>
#define INSTR_PROF_VALUE_PROF_DATA
#include "InstrProfData.inc"
COMPILER_RT_VISIBILITY void (*FreeHook)(void *) = NULL;
COMPILER_RT_VISIBILITY void *(*CallocHook)(size_t, size_t) = NULL;
uint32_t VPBufferSize = 0;
/* The buffer writer is reponsponsible in keeping writer state
* across the call.
*/
COMPILER_RT_VISIBILITY uint32_t lprofBufferWriter(ProfDataIOVec *IOVecs,
uint32_t NumIOVecs,
void **WriterCtx) {
uint32_t I;
char **Buffer = (char **)WriterCtx;
for (I = 0; I < NumIOVecs; I++) {
size_t Length = IOVecs[I].ElmSize * IOVecs[I].NumElm;
memcpy(*Buffer, IOVecs[I].Data, Length);
*Buffer += Length;
}
return 0;
}
static void llvmInitBufferIO(ProfBufferIO *BufferIO, WriterCallback FileWriter,
void *File, uint8_t *Buffer, uint32_t BufferSz) {
BufferIO->File = File;
BufferIO->FileWriter = FileWriter;
BufferIO->BufferStart = Buffer;
BufferIO->BufferSz = BufferSz;
BufferIO->CurOffset = 0;
}
COMPILER_RT_VISIBILITY ProfBufferIO *
lprofCreateBufferIO(WriterCallback FileWriter, void *File, uint32_t BufferSz) {
ProfBufferIO *BufferIO = (ProfBufferIO *)CallocHook(1, sizeof(ProfBufferIO));
uint8_t *Buffer = (uint8_t *)CallocHook(1, BufferSz);
if (!Buffer) {
FreeHook(BufferIO);
return 0;
}
llvmInitBufferIO(BufferIO, FileWriter, File, Buffer, BufferSz);
return BufferIO;
}
COMPILER_RT_VISIBILITY void lprofDeleteBufferIO(ProfBufferIO *BufferIO) {
FreeHook(BufferIO->BufferStart);
FreeHook(BufferIO);
}
COMPILER_RT_VISIBILITY int
lprofBufferIOWrite(ProfBufferIO *BufferIO, const uint8_t *Data, uint32_t Size) {
/* Buffer is not large enough, it is time to flush. */
if (Size + BufferIO->CurOffset > BufferIO->BufferSz) {
if (lprofBufferIOFlush(BufferIO) != 0)
return -1;
}
/* Special case, bypass the buffer completely. */
ProfDataIOVec IO[] = {{Data, sizeof(uint8_t), Size}};
if (Size > BufferIO->BufferSz) {
if (BufferIO->FileWriter(IO, 1, &BufferIO->File))
return -1;
} else {
/* Write the data to buffer */
uint8_t *Buffer = BufferIO->BufferStart + BufferIO->CurOffset;
lprofBufferWriter(IO, 1, (void **)&Buffer);
BufferIO->CurOffset = Buffer - BufferIO->BufferStart;
}
return 0;
}
COMPILER_RT_VISIBILITY int lprofBufferIOFlush(ProfBufferIO *BufferIO) {
if (BufferIO->CurOffset) {
ProfDataIOVec IO[] = {
{BufferIO->BufferStart, sizeof(uint8_t), BufferIO->CurOffset}};
if (BufferIO->FileWriter(IO, 1, &BufferIO->File))
return -1;
BufferIO->CurOffset = 0;
}
return 0;
}
#define VP_BUFFER_SIZE 8 * 1024
static int writeOneValueProfData(ProfBufferIO *BufferIO,
VPGatherHookType VPDataGatherer,
const __llvm_profile_data *Data) {
ValueProfData *CurVData = VPDataGatherer(Data);
if (!CurVData)
return 0;
if (lprofBufferIOWrite(BufferIO, (const uint8_t *)CurVData,
CurVData->TotalSize) != 0)
return -1;
FreeHook(CurVData);
return 0;
}
static int writeValueProfData(WriterCallback Writer, void *WriterCtx,
VPGatherHookType VPDataGatherer,
const __llvm_profile_data *DataBegin,
const __llvm_profile_data *DataEnd) {
ProfBufferIO *BufferIO;
uint32_t BufferSz;
const __llvm_profile_data *DI = 0;
if (!VPDataGatherer)
return 0;
BufferSz = VPBufferSize ? VPBufferSize : VP_BUFFER_SIZE;
BufferIO = lprofCreateBufferIO(Writer, WriterCtx, BufferSz);
for (DI = DataBegin; DI < DataEnd; DI++) {
if (writeOneValueProfData(BufferIO, VPDataGatherer, DI))
return -1;
}
if (lprofBufferIOFlush(BufferIO) != 0)
return -1;
lprofDeleteBufferIO(BufferIO);
return 0;
}
COMPILER_RT_VISIBILITY int lprofWriteData(WriterCallback Writer,
void *WriterCtx,
VPGatherHookType VPDataGatherer) {
/* Match logic in __llvm_profile_write_buffer(). */
const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
const uint64_t *CountersBegin = __llvm_profile_begin_counters();
const uint64_t *CountersEnd = __llvm_profile_end_counters();
const char *NamesBegin = __llvm_profile_begin_names();
const char *NamesEnd = __llvm_profile_end_names();
return lprofWriteDataImpl(Writer, WriterCtx, DataBegin, DataEnd,
CountersBegin, CountersEnd, VPDataGatherer,
NamesBegin, NamesEnd);
}
COMPILER_RT_VISIBILITY int
lprofWriteDataImpl(WriterCallback Writer, void *WriterCtx,
const __llvm_profile_data *DataBegin,
const __llvm_profile_data *DataEnd,
const uint64_t *CountersBegin, const uint64_t *CountersEnd,
VPGatherHookType VPDataGatherer, const char *NamesBegin,
const char *NamesEnd) {
/* Calculate size of sections. */
const uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd);
const uint64_t CountersSize = CountersEnd - CountersBegin;
const uint64_t NamesSize = NamesEnd - NamesBegin;
const uint64_t Padding = __llvm_profile_get_num_padding_bytes(NamesSize);
/* Enough zeroes for padding. */
const char Zeroes[sizeof(uint64_t)] = {0};
/* Create the header. */
__llvm_profile_header Header;
if (!DataSize)
return 0;
/* Initialize header structure. */
#define INSTR_PROF_RAW_HEADER(Type, Name, Init) Header.Name = Init;
#include "InstrProfData.inc"
/* Write the data. */
ProfDataIOVec IOVec[] = {{&Header, sizeof(__llvm_profile_header), 1},
{DataBegin, sizeof(__llvm_profile_data), DataSize},
{CountersBegin, sizeof(uint64_t), CountersSize},
{NamesBegin, sizeof(uint8_t), NamesSize},
{Zeroes, sizeof(uint8_t), Padding}};
if (Writer(IOVec, sizeof(IOVec) / sizeof(*IOVec), &WriterCtx))
return -1;
return writeValueProfData(Writer, WriterCtx, VPDataGatherer, DataBegin,
DataEnd);
}
|
