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|
/*===- InstrProfilingFile.c - Write instrumentation to a file -------------===*\
|*
|* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
static int writeFile(FILE *File) {
/* Match logic in __llvm_profile_write_buffer(). */
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;
const uint64_t Padding = sizeof(uint64_t) - NamesSize % sizeof(uint64_t);
/* Enough zeroes for padding. */
const char Zeroes[sizeof(uint64_t)] = {0};
/* Create the header. */
uint64_t Header[PROFILE_HEADER_SIZE];
Header[0] = __llvm_profile_get_magic();
Header[1] = __llvm_profile_get_version();
Header[2] = DataSize;
Header[3] = CountersSize;
Header[4] = NamesSize;
Header[5] = (uintptr_t)CountersBegin;
Header[6] = (uintptr_t)NamesBegin;
/* Write the data. */
#define CHECK_fwrite(Data, Size, Length, File) \
do { if (fwrite(Data, Size, Length, File) != Length) return -1; } while (0)
CHECK_fwrite(Header, sizeof(uint64_t), PROFILE_HEADER_SIZE, File);
CHECK_fwrite(DataBegin, sizeof(__llvm_profile_data), DataSize, File);
CHECK_fwrite(CountersBegin, sizeof(uint64_t), CountersSize, File);
CHECK_fwrite(NamesBegin, sizeof(char), NamesSize, File);
CHECK_fwrite(Zeroes, sizeof(char), Padding, File);
#undef CHECK_fwrite
return 0;
}
typedef struct __llvm_profile_writer {
struct __llvm_profile_writer *Next;
int (*Data)(FILE *);
} __llvm_profile_writer;
__attribute__((weak)) __llvm_profile_writer *__llvm_profile_HeadWriter = NULL;
static __llvm_profile_writer Writer = {NULL, writeFile};
__attribute__((visibility("hidden")))
void __llvm_profile_register_write_file(void) {
static int HasBeenRegistered = 0;
if (HasBeenRegistered)
return;
HasBeenRegistered = 1;
Writer.Next = __llvm_profile_HeadWriter;
__llvm_profile_HeadWriter = &Writer;
}
static int writeFileWithName(const char *OutputName) {
int RetVal;
FILE *OutputFile;
if (!OutputName || !OutputName[0])
return -1;
OutputFile = fopen(OutputName, "w");
if (!OutputFile)
return -1;
__llvm_profile_writer *Writer = __llvm_profile_HeadWriter;
if (Writer)
for (; Writer; Writer = Writer->Next) {
RetVal = Writer->Data(OutputFile);
if (RetVal != 0)
break;
}
else
// Default to calling this executable's writeFile.
RetVal = writeFile(OutputFile);
fclose(OutputFile);
return RetVal;
}
__attribute__((weak)) const char *__llvm_profile_CurrentFilename = NULL;
__attribute__((weak)) void __llvm_profile_set_filename(const char *Filename) {
__llvm_profile_CurrentFilename = Filename;
}
int getpid(void);
__attribute__((weak)) int __llvm_profile_write_file(void) {
char *AllocatedFilename = NULL;
int I, J;
int RetVal;
#define MAX_PID_SIZE 16
char PidChars[MAX_PID_SIZE] = { 0 };
int PidLength = 0;
int NumPids = 0;
/* Get the filename. */
const char *Filename = __llvm_profile_CurrentFilename;
#define UPDATE_FILENAME(NextFilename) \
if (!Filename || !Filename[0]) Filename = NextFilename
UPDATE_FILENAME(getenv("LLVM_PROFILE_FILE"));
UPDATE_FILENAME("default.profraw");
#undef UPDATE_FILENAME
/* Check the filename for "%p", which indicates a pid-substitution. */
for (I = 0; Filename[I]; ++I)
if (Filename[I] == '%' && Filename[++I] == 'p')
if (!NumPids++) {
PidLength = snprintf(PidChars, MAX_PID_SIZE, "%d", getpid());
if (PidLength <= 0)
return -1;
}
if (NumPids) {
/* Allocate enough space for the substituted filename. */
AllocatedFilename = (char*)malloc(I + NumPids*(PidLength - 2) + 1);
if (!AllocatedFilename)
return -1;
/* Construct the new filename. */
for (I = 0, J = 0; Filename[I]; ++I)
if (Filename[I] == '%') {
if (Filename[++I] == 'p') {
memcpy(AllocatedFilename + J, PidChars, PidLength);
J += PidLength;
}
/* Drop any unknown substitutions. */
} else
AllocatedFilename[J++] = Filename[I];
AllocatedFilename[J] = 0;
/* Actually use the computed name. */
Filename = AllocatedFilename;
}
/* Write the file. */
RetVal = writeFileWithName(Filename);
/* Free the filename. */
if (AllocatedFilename)
free(AllocatedFilename);
return RetVal;
}
static void writeFileWithoutReturn(void) {
__llvm_profile_write_file();
}
__attribute__((weak)) int __llvm_profile_register_write_file_atexit(void) {
static int HasBeenRegistered = 0;
if (HasBeenRegistered)
return 0;
HasBeenRegistered = 1;
return atexit(writeFileWithoutReturn);
}
|
