/*===- InstrProfilingFile.c - Write instrumentation to a file -------------===*\ |* |* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |* See https://llvm.org/LICENSE.txt for license information. |* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |* \*===----------------------------------------------------------------------===*/ #if !defined(__Fuchsia__) #include <assert.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #ifdef _MSC_VER /* For _alloca. */ #include <malloc.h> #endif #if defined(_WIN32) #include "WindowsMMap.h" /* For _chsize_s */ #include <io.h> #include <process.h> #else #include <sys/file.h> #include <sys/mman.h> #include <unistd.h> #if defined(__linux__) #include <sys/types.h> #endif #endif #include "InstrProfiling.h" #include "InstrProfilingInternal.h" #include "InstrProfilingPort.h" #include "InstrProfilingUtil.h" /* From where is profile name specified. * The order the enumerators define their * precedence. Re-order them may lead to * runtime behavior change. */ ProfileNameSpecifier; static const char *getPNSStr(ProfileNameSpecifier PNS) { … } #define MAX_PID_SIZE … /* Data structure holding the result of parsed filename pattern. */ lprofFilename; static lprofFilename lprofCurFilename = …; static int ProfileMergeRequested = …; static int getProfileFileSizeForMerging(FILE *ProfileFile, uint64_t *ProfileFileSize); #if defined(__APPLE__) static const int ContinuousModeSupported = 1; static const int UseBiasVar = 0; static const char *FileOpenMode = "a+b"; static void *BiasAddr = NULL; static void *BiasDefaultAddr = NULL; static void *BitmapBiasAddr = NULL; static void *BitmapBiasDefaultAddr = NULL; static int mmapForContinuousMode(uint64_t CurrentFileOffset, FILE *File) { /* 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 char *CountersBegin = __llvm_profile_begin_counters(); const char *CountersEnd = __llvm_profile_end_counters(); const char *BitmapBegin = __llvm_profile_begin_bitmap(); const char *BitmapEnd = __llvm_profile_end_bitmap(); const char *NamesBegin = __llvm_profile_begin_names(); const char *NamesEnd = __llvm_profile_end_names(); const uint64_t NamesSize = (NamesEnd - NamesBegin) * sizeof(char); uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd); uint64_t CountersSize = __llvm_profile_get_counters_size(CountersBegin, CountersEnd); uint64_t NumBitmapBytes = __llvm_profile_get_num_bitmap_bytes(BitmapBegin, BitmapEnd); /* Check that the counter, bitmap, 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 1; } if ((intptr_t)BitmapBegin % PageSize != 0) { PROF_ERR("Bitmap section not page-aligned (start = %p, pagesz = %u).\n", BitmapBegin, PageSize); return 1; } if ((intptr_t)DataBegin % PageSize != 0) { PROF_ERR("Data section not page-aligned (start = %p, pagesz = %u).\n", DataBegin, PageSize); return 1; } int Fileno = fileno(File); /* Determine how much padding is needed before/after the counters and * after the names. */ uint64_t PaddingBytesBeforeCounters, PaddingBytesAfterCounters, PaddingBytesAfterNames, PaddingBytesAfterBitmapBytes, PaddingBytesAfterVTable, PaddingBytesAfterVNames; __llvm_profile_get_padding_sizes_for_counters( DataSize, CountersSize, NumBitmapBytes, NamesSize, /*VTableSize=*/0, /*VNameSize=*/0, &PaddingBytesBeforeCounters, &PaddingBytesAfterCounters, &PaddingBytesAfterBitmapBytes, &PaddingBytesAfterNames, &PaddingBytesAfterVTable, &PaddingBytesAfterVNames); uint64_t PageAlignedCountersLength = CountersSize + PaddingBytesAfterCounters; uint64_t FileOffsetToCounters = CurrentFileOffset + sizeof(__llvm_profile_header) + DataSize + PaddingBytesBeforeCounters; void *CounterMmap = 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); return 1; } /* Also mmap MCDC bitmap bytes. If there aren't any bitmap bytes, mmap() * will fail with EINVAL. */ if (NumBitmapBytes == 0) return 0; uint64_t PageAlignedBitmapLength = NumBitmapBytes + PaddingBytesAfterBitmapBytes; uint64_t FileOffsetToBitmap = FileOffsetToCounters + CountersSize + PaddingBytesAfterCounters; void *BitmapMmap = mmap((void *)BitmapBegin, PageAlignedBitmapLength, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, Fileno, FileOffsetToBitmap); if (BitmapMmap != BitmapBegin) { PROF_ERR( "Continuous counter sync mode is enabled, but mmap() failed (%s).\n" " - BitmapBegin: %p\n" " - PageAlignedBitmapLength: %" PRIu64 "\n" " - Fileno: %d\n" " - FileOffsetToBitmap: %" PRIu64 "\n", strerror(errno), BitmapBegin, PageAlignedBitmapLength, Fileno, FileOffsetToBitmap); return 1; } return 0; } #elif defined(__ELF__) || defined(_WIN32) #define INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR … COMPILER_RT_VISIBILITY intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR = …; #define INSTR_PROF_PROFILE_BITMAP_BIAS_DEFAULT_VAR … COMPILER_RT_VISIBILITY intptr_t INSTR_PROF_PROFILE_BITMAP_BIAS_DEFAULT_VAR = …; /* This variable is a weak external reference which could be used to detect * whether or not the compiler defined this symbol. */ #if defined(_MSC_VER) COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR; COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_BITMAP_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)) #pragma comment( \ linker, "/alternatename:" WIN_SYM_PREFIX INSTR_PROF_QUOTE( \ INSTR_PROF_PROFILE_BITMAP_BIAS_VAR) "=" WIN_SYM_PREFIX \ INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_BITMAP_BIAS_DEFAULT_VAR)) #else COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR __attribute__((weak …, alias …)); COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_BITMAP_BIAS_VAR __attribute__((weak …, alias …)); #endif static const int ContinuousModeSupported = …; static const int UseBiasVar = …; /* TODO: If there are two DSOs, the second DSO initilization will truncate the * first profile file. */ static const char *FileOpenMode = …; /* 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 = …; static void *BiasDefaultAddr = …; static void *BitmapBiasAddr = …; static void *BitmapBiasDefaultAddr = …; static int mmapForContinuousMode(uint64_t CurrentFileOffset, FILE *File) { … } #else static const int ContinuousModeSupported = 0; static const int UseBiasVar = 0; static const char *FileOpenMode = "a+b"; static void *BiasAddr = NULL; static void *BiasDefaultAddr = NULL; static void *BitmapBiasAddr = NULL; static void *BitmapBiasDefaultAddr = NULL; static int mmapForContinuousMode(uint64_t CurrentFileOffset, FILE *File) { return 0; } #endif static int isProfileMergeRequested(void) { … } static void setProfileMergeRequested(int EnableMerge) { … } static FILE *ProfileFile = …; static FILE *getProfileFile(void) { … } static void setProfileFile(FILE *File) { … } static int getCurFilenameLength(void); static const char *getCurFilename(char *FilenameBuf, int ForceUseBuf); static unsigned doMerging(void) { … } /* Return 1 if there is an error, otherwise return 0. */ static uint32_t fileWriter(ProfDataWriter *This, ProfDataIOVec *IOVecs, uint32_t NumIOVecs) { … } /* TODO: make buffer size controllable by an internal option, and compiler can pass the size to runtime via a variable. */ static uint32_t orderFileWriter(FILE *File, const uint32_t *DataStart) { … } static void initFileWriter(ProfDataWriter *This, FILE *File) { … } COMPILER_RT_VISIBILITY ProfBufferIO * lprofCreateBufferIOInternal(void *File, uint32_t BufferSz) { … } static void setupIOBuffer(void) { … } /* Get the size of the profile file. If there are any errors, print the * message under the assumption that the profile is being read for merging * purposes, and return -1. Otherwise return the file size in the inout param * \p ProfileFileSize. */ static int getProfileFileSizeForMerging(FILE *ProfileFile, uint64_t *ProfileFileSize) { … } /* mmap() \p ProfileFile for profile merging purposes, assuming that an * exclusive lock is held on the file and that \p ProfileFileSize is the * length of the file. Return the mmap'd buffer in the inout variable * \p ProfileBuffer. Returns -1 on failure. On success, the caller is * responsible for unmapping the mmap'd buffer in \p ProfileBuffer. */ static int mmapProfileForMerging(FILE *ProfileFile, uint64_t ProfileFileSize, char **ProfileBuffer) { … } /* Read profile data in \c ProfileFile and merge with in-memory profile counters. Returns -1 if there is fatal error, otheriwse 0 is returned. Returning 0 does not mean merge is actually performed. If merge is actually done, *MergeDone is set to 1. */ static int doProfileMerging(FILE *ProfileFile, int *MergeDone) { … } /* Create the directory holding the file, if needed. */ static void createProfileDir(const char *Filename) { … } /* Open the profile data for merging. It opens the file in r+b mode with * file locking. If the file has content which is compatible with the * current process, it also reads in the profile data in the file and merge * it with in-memory counters. After the profile data is merged in memory, * the original profile data is truncated and gets ready for the profile * dumper. With profile merging enabled, each executable as well as any of * its instrumented shared libraries dump profile data into their own data file. */ static FILE *openFileForMerging(const char *ProfileFileName, int *MergeDone) { … } static FILE *getFileObject(const char *OutputName) { … } /* Write profile data to file \c OutputName. */ static int writeFile(const char *OutputName) { … } /* Write order data to file \c OutputName. */ static int writeOrderFile(const char *OutputName) { … } #define LPROF_INIT_ONCE_ENV … static void truncateCurrentFile(void) { … } /* 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) { … } static void initializeProfileForContinuousMode(void) { … } static const char *DefaultProfileName = …; static void resetFilenameToDefault(void) { … } static unsigned getMergePoolSize(const char *FilenamePat, int *I) { … } /* Assert that Idx does index past a string null terminator. Return the * result of the check. */ static int checkBounds(int Idx, int Strlen) { … } /* Parses the pattern string \p FilenamePat and stores the result to * lprofcurFilename structure. */ static int parseFilenamePattern(const char *FilenamePat, unsigned CopyFilenamePat) { … } static void parseAndSetFilename(const char *FilenamePat, ProfileNameSpecifier PNS, unsigned CopyFilenamePat) { … } /* Return buffer length that is required to store the current profile * filename with PID and hostname substitutions. */ /* The length to hold uint64_t followed by 3 digits pool id including '_' */ #define SIGLEN … static int getCurFilenameLength(void) { … } /* Return the pointer to the current profile file name (after substituting * PIDs and Hostnames in filename pattern. \p FilenameBuf is the buffer * to store the resulting filename. If no substitution is needed, the * current filename pattern string is directly returned, unless ForceUseBuf * is enabled. */ static const char *getCurFilename(char *FilenameBuf, int ForceUseBuf) { … } /* Returns the pointer to the environment variable * string. Returns null if the env var is not set. */ static const char *getFilenamePatFromEnv(void) { … } COMPILER_RT_VISIBILITY const char *__llvm_profile_get_path_prefix(void) { … } COMPILER_RT_VISIBILITY const char *__llvm_profile_get_filename(void) { … } /* This API initializes the file handling, both user specified * profile path via -fprofile-instr-generate= and LLVM_PROFILE_FILE * environment variable can override this default value. */ COMPILER_RT_VISIBILITY void __llvm_profile_initialize_file(void) { … } /* This method is invoked by the runtime initialization hook * InstrProfilingRuntime.o if it is linked in. */ COMPILER_RT_VISIBILITY void __llvm_profile_initialize(void) { … } /* This API is directly called by the user application code. It has the * highest precedence compared with LLVM_PROFILE_FILE environment variable * and command line option -fprofile-instr-generate=<profile_name>. */ COMPILER_RT_VISIBILITY void __llvm_profile_set_filename(const char *FilenamePat) { … } /* The public API for writing profile data into the file with name * set by previous calls to __llvm_profile_set_filename or * __llvm_profile_override_default_filename or * __llvm_profile_initialize_file. */ COMPILER_RT_VISIBILITY int __llvm_profile_write_file(void) { … } COMPILER_RT_VISIBILITY int __llvm_profile_dump(void) { … } /* Order file data will be saved in a file with suffx .order. */ static const char *OrderFileSuffix = …; COMPILER_RT_VISIBILITY int __llvm_orderfile_write_file(void) { … } COMPILER_RT_VISIBILITY int __llvm_orderfile_dump(void) { … } static void writeFileWithoutReturn(void) { … } COMPILER_RT_VISIBILITY int __llvm_profile_register_write_file_atexit(void) { … } COMPILER_RT_VISIBILITY int __llvm_profile_set_file_object(FILE *File, int EnableMerge) { … } #endif
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