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[Profile][NFC] Clean up initializeProfileForContinuousMode 

Merge two versions of `initializeProfileForContinuousMode` function into one.

Differential Revision: https://reviews.llvm.org/D107591
This commit is contained in:
Zequan Wu 2021-08-05 12:08:04 -07:00
parent d238b60285
commit 8c4208d5c1
3 changed files with 160 additions and 234 deletions
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386
compiler-rt/lib/profile/InstrProfilingFile.c
View File

@ -92,6 +92,56 @@ static lprofFilename lprofCurFilename = {0, 0, 0, {0}, NULL,
{0}, 0, 0, 0, PNS_unknown};
static int ProfileMergeRequested = 0;
#if defined(__APPLE__)
static const int ContinuousModeSupported = 1;
static const int UseBiasVar = 0;
static const char *FileOpenMode = "a+b";
static intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
static void *BiasAddr = NULL;
static void *BiasDefaultAddr = NULL;
#elif defined(__ELF__) || defined(_WIN32)
#define INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR \
INSTR_PROF_CONCAT(INSTR_PROF_PROFILE_COUNTER_BIAS_VAR, _default)
intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR = 0;
/* This variable is a weak external reference which could be used to detect
* whether or not the compiler defined this symbol. */
#if defined(_WIN32)
COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
#if defined(_M_IX86) || defined(__i386__)
#define WIN_SYM_PREFIX "_"
#else
#define WIN_SYM_PREFIX
#endif
#pragma comment( \
linker, "/alternatename:" WIN_SYM_PREFIX INSTR_PROF_QUOTE( \
INSTR_PROF_PROFILE_COUNTER_BIAS_VAR) "=" WIN_SYM_PREFIX \
INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR))
#else
COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR
__attribute__((weak, alias(INSTR_PROF_QUOTE(
INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR))));
#endif
static const int ContinuousModeSupported = 1;
static const int UseBiasVar = 1;
/* TODO: If there are two DSOs, the second DSO initilization will truncate the
* first profile file. */
static const char *FileOpenMode = "w+b";
/* This symbol is defined by the compiler when runtime counter relocation is
* used and runtime provides a weak alias so we can check if it's defined. */
static void *BiasAddr = &INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
static void *BiasDefaultAddr = &INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR;
#else
static const int ContinuousModeSupported = 0;
static const int UseBiasVar = 0;
static const char *FileOpenMode = "a+b";
static intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
static void *BiasAddr = NULL;
static void *BiasDefaultAddr = NULL;
#endif
static int isProfileMergeRequested() { return ProfileMergeRequested; }
static void setProfileMergeRequested(int EnableMerge) {
ProfileMergeRequested = EnableMerge;
@ -426,8 +476,6 @@ static void truncateCurrentFile(void) {
fclose(File);
}
// TODO: Move these functions into InstrProfilingPlatform* files.
#if defined(__APPLE__)
/* Write a partial profile to \p Filename, which is required to be backed by
* the open file object \p File. */
static int writeProfileWithFileObject(const char *Filename, FILE *File) {
@ -439,19 +487,17 @@ static int writeProfileWithFileObject(const char *Filename, FILE *File) {
return rc;
}
/* Unlock the profile \p File and clear the unlock flag. */
static void unlockProfile(int *ProfileRequiresUnlock, FILE *File) {
if (!*ProfileRequiresUnlock) {
PROF_WARN("%s", "Expected to require profile unlock\n");
}
lprofUnlockFileHandle(File);
*ProfileRequiresUnlock = 0;
}
static void initializeProfileForContinuousMode(void) {
if (!__llvm_profile_is_continuous_mode_enabled())
return;
if (!ContinuousModeSupported) {
PROF_ERR("%s\n", "continuous mode is unsupported on this platform");
return;
}
if (UseBiasVar && BiasAddr == BiasDefaultAddr) {
PROF_ERR("%s\n", "__llvm_profile_counter_bias is undefined");
return;
}
/* Get the sizes of various profile data sections. Taken from
* __llvm_profile_get_size_for_buffer(). */
@ -465,19 +511,6 @@ static void initializeProfileForContinuousMode(void) {
uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd);
uint64_t CountersSize = CountersEnd - CountersBegin;
/* Check that the counter and data sections in this image are page-aligned. */
unsigned PageSize = getpagesize();
if ((intptr_t)CountersBegin % PageSize != 0) {
PROF_ERR("Counters section not page-aligned (start = %p, pagesz = %u).\n",
CountersBegin, PageSize);
return;
}
if ((intptr_t)DataBegin % PageSize != 0) {
PROF_ERR("Data section not page-aligned (start = %p, pagesz = %u).\n",
DataBegin, PageSize);
return;
}
int Length = getCurFilenameLength();
char *FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
const char *Filename = getCurFilename(FilenameBuf, 0);
@ -486,33 +519,7 @@ static void initializeProfileForContinuousMode(void) {
FILE *File = NULL;
off_t CurrentFileOffset = 0;
off_t OffsetModPage = 0;
/* Whether an exclusive lock on the profile must be dropped after init.
* Use a cleanup to warn if the unlock does not occur. */
COMPILER_RT_CLEANUP(warnIfNonZero) int ProfileRequiresUnlock = 0;
if (!doMerging()) {
/* We are not merging profiles, so open the raw profile in append mode. */
File = fopen(Filename, "a+b");
if (!File)
return;
/* Check that the offset within the file is page-aligned. */
CurrentFileOffset = ftello(File);
OffsetModPage = CurrentFileOffset % PageSize;
if (OffsetModPage != 0) {
PROF_ERR("Continuous counter sync mode is enabled, but raw profile is not"
"page-aligned. CurrentFileOffset = %" PRIu64 ", pagesz = %u.\n",
(uint64_t)CurrentFileOffset, PageSize);
return;
}
/* Grow the profile so that mmap() can succeed. Leak the file handle, as
* the file should stay open. */
if (writeProfileWithFileObject(Filename, File) != 0)
return;
} else {
if (doMerging()) {
/* We are merging profiles. Map the counter section as shared memory into
* the profile, i.e. into each participating process. An increment in one
* process should be visible to every other process with the same counter
@ -521,200 +528,127 @@ static void initializeProfileForContinuousMode(void) {
if (!File)
return;
ProfileRequiresUnlock = 1;
uint64_t ProfileFileSize;
if (getProfileFileSizeForMerging(File, &ProfileFileSize) == -1)
return unlockProfile(&ProfileRequiresUnlock, File);
if (ProfileFileSize == 0) {
/* Grow the profile so that mmap() can succeed. Leak the file handle, as
* the file should stay open. */
if (writeProfileWithFileObject(Filename, File) != 0)
return unlockProfile(&ProfileRequiresUnlock, File);
} else {
/* The merged profile has a non-zero length. Check that it is compatible
* with the data in this process. */
char *ProfileBuffer;
if (mmapProfileForMerging(File, ProfileFileSize, &ProfileBuffer) == -1 ||
munmap(ProfileBuffer, ProfileFileSize) == -1)
return unlockProfile(&ProfileRequiresUnlock, File);
}
}
/* mmap() the profile counters so long as there is at least one counter.
* If there aren't any counters, mmap() would fail with EINVAL. */
if (CountersSize > 0) {
int Fileno = fileno(File);
/* Determine how much padding is needed before/after the counters and after
* the names. */
uint64_t PaddingBytesBeforeCounters, PaddingBytesAfterCounters,
PaddingBytesAfterNames;
__llvm_profile_get_padding_sizes_for_counters(
DataSize, CountersSize, NamesSize, &PaddingBytesBeforeCounters,
&PaddingBytesAfterCounters, &PaddingBytesAfterNames);
uint64_t PageAlignedCountersLength =
(CountersSize * sizeof(uint64_t)) + PaddingBytesAfterCounters;
uint64_t FileOffsetToCounters =
CurrentFileOffset + sizeof(__llvm_profile_header) +
(DataSize * sizeof(__llvm_profile_data)) + PaddingBytesBeforeCounters;
uint64_t *CounterMmap = (uint64_t *)mmap(
(void *)CountersBegin, PageAlignedCountersLength, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, Fileno, FileOffsetToCounters);
if (CounterMmap != CountersBegin) {
PROF_ERR(
"Continuous counter sync mode is enabled, but mmap() failed (%s).\n"
" - CountersBegin: %p\n"
" - PageAlignedCountersLength: %" PRIu64 "\n"
" - Fileno: %d\n"
" - FileOffsetToCounters: %" PRIu64 "\n",
strerror(errno), CountersBegin, PageAlignedCountersLength, Fileno,
FileOffsetToCounters);
}
}
if (ProfileRequiresUnlock)
unlockProfile(&ProfileRequiresUnlock, File);
}
#elif defined(__ELF__) || defined(_WIN32)
#define INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR \
INSTR_PROF_CONCAT(INSTR_PROF_PROFILE_COUNTER_BIAS_VAR, _default)
intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR = 0;
/* This variable is a weak external reference which could be used to detect
* whether or not the compiler defined this symbol. */
#if defined(_WIN32)
COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
#if defined(_M_IX86) || defined(__i386__)
#define WIN_SYM_PREFIX "_"
#else
#define WIN_SYM_PREFIX
#endif
#pragma comment( \
linker, "/alternatename:" WIN_SYM_PREFIX INSTR_PROF_QUOTE( \
INSTR_PROF_PROFILE_COUNTER_BIAS_VAR) "=" WIN_SYM_PREFIX \
INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR))
#else
COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR
__attribute__((weak, alias(INSTR_PROF_QUOTE(
INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR))));
#endif
static int writeMMappedFile(FILE *OutputFile, char **Profile) {
if (!OutputFile)
return -1;
/* Write the data into a file. */
setupIOBuffer();
ProfDataWriter fileWriter;
initFileWriter(&fileWriter, OutputFile);
if (lprofWriteData(&fileWriter, NULL, 0)) {
PROF_ERR("Failed to write profile: %s\n", strerror(errno));
return -1;
}
fflush(OutputFile);
/* Get the file size. */
uint64_t FileSize = ftell(OutputFile);
/* Map the profile. */
*Profile = (char *)mmap(
NULL, FileSize, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(OutputFile), 0);
if (*Profile == MAP_FAILED) {
PROF_ERR("Unable to mmap profile: %s\n", strerror(errno));
return -1;
}
return 0;
}
static void initializeProfileForContinuousMode(void) {
if (!__llvm_profile_is_continuous_mode_enabled())
return;
/* This symbol is defined by the compiler when runtime counter relocation is
* used and runtime provides a weak alias so we can check if it's defined. */
void *BiasAddr = &INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
void *BiasDefaultAddr = &INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR;
if (BiasAddr == BiasDefaultAddr) {
PROF_ERR("%s\n", "__llvm_profile_counter_bias is undefined");
return;
}
/* Get the sizes of various profile data sections. Taken from
* __llvm_profile_get_size_for_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();
uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd);
const uint64_t CountersOffset =
sizeof(__llvm_profile_header) + (DataSize * sizeof(__llvm_profile_data));
int Length = getCurFilenameLength();
char *FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
const char *Filename = getCurFilename(FilenameBuf, 0);
if (!Filename)
return;
FILE *File = NULL;
char *Profile = NULL;
if (!doMerging()) {
File = fopen(Filename, "w+b");
if (!File)
return;
if (writeMMappedFile(File, &Profile) == -1) {
fclose(File);
return;
}
} else {
File = lprofOpenFileEx(Filename);
if (!File)
return;
uint64_t ProfileFileSize = 0;
if (getProfileFileSizeForMerging(File, &ProfileFileSize) == -1) {
lprofUnlockFileHandle(File);
fclose(File);
return;
}
if (!ProfileFileSize) {
if (writeMMappedFile(File, &Profile) == -1) {
if (ProfileFileSize == 0) {
/* Grow the profile so that mmap() can succeed. Leak the file handle, as
* the file should stay open. */
if (writeProfileWithFileObject(Filename, File) != 0) {
lprofUnlockFileHandle(File);
fclose(File);
return;
}
} else {
/* The merged profile has a non-zero length. Check that it is compatible
* with the data in this process. */
if (mmapProfileForMerging(File, ProfileFileSize, &Profile) == -1) {
char *ProfileBuffer;
if (mmapProfileForMerging(File, ProfileFileSize, &ProfileBuffer) == -1 ||
munmap(ProfileBuffer, ProfileFileSize)) {
lprofUnlockFileHandle(File);
fclose(File);
return;
}
}
lprofUnlockFileHandle(File);
} else {
File = fopen(Filename, FileOpenMode);
if (!File)
return;
/* Check that the offset within the file is page-aligned. */
CurrentFileOffset = ftello(File);
unsigned PageSize = getpagesize();
if (CurrentFileOffset % PageSize != 0) {
PROF_ERR("Continuous counter sync mode is enabled, but raw profile is not"
"page-aligned. CurrentFileOffset = %" PRIu64 ", pagesz = %u.\n",
(uint64_t)CurrentFileOffset, PageSize);
return;
}
if (writeProfileWithFileObject(Filename, File) != 0) {
fclose(File);
return;
}
}
/* Update the profile fields based on the current mapping. */
INSTR_PROF_PROFILE_COUNTER_BIAS_VAR =
(intptr_t)Profile - (uintptr_t)CountersBegin +
CountersOffset;
/* mmap() the profile counters so long as there is at least one counter.
* If there aren't any counters, mmap() would fail with EINVAL. */
if (CountersSize > 0) {
int Fileno = fileno(File);
if (UseBiasVar) {
/* Get the file size. */
uint64_t FileSize = ftell(File);
/* Return the memory allocated for counters to OS. */
lprofReleaseMemoryPagesToOS((uintptr_t)CountersBegin, (uintptr_t)CountersEnd);
/* Map the profile. */
char *Profile = (char *)mmap(NULL, FileSize, PROT_READ | PROT_WRITE,
MAP_SHARED, Fileno, 0);
if (Profile == MAP_FAILED) {
PROF_ERR("Unable to mmap profile: %s\n", strerror(errno));
return;
}
const uint64_t CountersOffsetInBiasMode =
sizeof(__llvm_profile_header) +
(DataSize * sizeof(__llvm_profile_data));
/* Update the profile fields based on the current mapping. */
INSTR_PROF_PROFILE_COUNTER_BIAS_VAR = (intptr_t)Profile -
(uintptr_t)CountersBegin +
CountersOffsetInBiasMode;
/* Return the memory allocated for counters to OS. */
lprofReleaseMemoryPagesToOS((uintptr_t)CountersBegin,
(uintptr_t)CountersEnd);
} else {
/* Check that the counter and data sections in this image are
* page-aligned. */
unsigned PageSize = getpagesize();
if ((intptr_t)CountersBegin % PageSize != 0) {
PROF_ERR(
"Counters section not page-aligned (start = %p, pagesz = %u).\n",
CountersBegin, PageSize);
return;
}
if ((intptr_t)DataBegin % PageSize != 0) {
PROF_ERR("Data section not page-aligned (start = %p, pagesz = %u).\n",
DataBegin, PageSize);
return;
}
/* Determine how much padding is needed before/after the counters and
* after the names. */
uint64_t PaddingBytesBeforeCounters, PaddingBytesAfterCounters,
PaddingBytesAfterNames;
__llvm_profile_get_padding_sizes_for_counters(
DataSize, CountersSize, NamesSize, &PaddingBytesBeforeCounters,
&PaddingBytesAfterCounters, &PaddingBytesAfterNames);
uint64_t PageAlignedCountersLength =
(CountersSize * sizeof(uint64_t)) + PaddingBytesAfterCounters;
uint64_t FileOffsetToCounters =
CurrentFileOffset + sizeof(__llvm_profile_header) +
(DataSize * sizeof(__llvm_profile_data)) + PaddingBytesBeforeCounters;
uint64_t *CounterMmap =
(uint64_t *)mmap((void *)CountersBegin, PageAlignedCountersLength,
PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED,
Fileno, FileOffsetToCounters);
if (CounterMmap != CountersBegin) {
PROF_ERR(
"Continuous counter sync mode is enabled, but mmap() failed (%s).\n"
" - CountersBegin: %p\n"
" - PageAlignedCountersLength: %" PRIu64 "\n"
" - Fileno: %d\n"
" - FileOffsetToCounters: %" PRIu64 "\n",
strerror(errno), CountersBegin, PageAlignedCountersLength, Fileno,
FileOffsetToCounters);
}
}
}
if (doMerging()) {
lprofUnlockFileHandle(File);
fclose(File);
}
}
#else
static void initializeProfileForContinuousMode(void) {
PROF_ERR("%s\n", "continuous mode is unsupported on this platform");
}
#endif
static const char *DefaultProfileName = "default.profraw";
static void resetFilenameToDefault(void) {

5
compiler-rt/lib/profile/InstrProfilingUtil.c
View File

@ -353,8 +353,3 @@ COMPILER_RT_VISIBILITY int lprofReleaseMemoryPagesToOS(uintptr_t Begin,
}
return 0;
}
COMPILER_RT_VISIBILITY void warnIfNonZero(int *i) {
if (*i)
PROF_WARN("Expected flag to be 0, but got: %d\n", *i);
}

3
compiler-rt/lib/profile/InstrProfilingUtil.h
View File

@ -84,7 +84,4 @@ static inline size_t lprofRoundDownTo(size_t x, size_t boundary) {
int lprofReleaseMemoryPagesToOS(uintptr_t Begin, uintptr_t End);
/// Noisly warn if *i is non-zero. Intended for use with COMPILER_RT_CLEANUP.
void warnIfNonZero(int *i);
#endif /* PROFILE_INSTRPROFILINGUTIL_H */