ba1f4405c6
This avoids the test failure that was introduced in rG32bddad where this function pulls in the rest of InstrProfilingFile.c which is undesirable in use cases when profile runtime is being used without the rest of libc. This also allows additional cleanup by eliminating another variable from platforms that don't need it. Differential Revision: https://reviews.llvm.org/D76750
1141 lines
36 KiB
C
1141 lines
36 KiB
C
/*===- InstrProfilingFile.c - Write instrumentation to a file -------------===*\
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|*
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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|* See https://llvm.org/LICENSE.txt for license information.
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|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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|*
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\*===----------------------------------------------------------------------===*/
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#if !defined(__Fuchsia__)
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef _MSC_VER
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/* For _alloca. */
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#include <malloc.h>
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#endif
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#if defined(_WIN32)
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#include "WindowsMMap.h"
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/* For _chsize_s */
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#include <io.h>
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#include <process.h>
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#else
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#include <sys/file.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#if defined(__linux__)
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#include <sys/types.h>
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#endif
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#endif
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#include "InstrProfiling.h"
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#include "InstrProfilingInternal.h"
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#include "InstrProfilingPort.h"
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#include "InstrProfilingUtil.h"
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/* From where is profile name specified.
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* The order the enumerators define their
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* precedence. Re-order them may lead to
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* runtime behavior change. */
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typedef enum ProfileNameSpecifier {
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PNS_unknown = 0,
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PNS_default,
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PNS_command_line,
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PNS_environment,
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PNS_runtime_api
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} ProfileNameSpecifier;
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static const char *getPNSStr(ProfileNameSpecifier PNS) {
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switch (PNS) {
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case PNS_default:
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return "default setting";
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case PNS_command_line:
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return "command line";
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case PNS_environment:
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return "environment variable";
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case PNS_runtime_api:
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return "runtime API";
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default:
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return "Unknown";
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}
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}
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#define MAX_PID_SIZE 16
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/* Data structure holding the result of parsed filename pattern. */
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typedef struct lprofFilename {
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/* File name string possibly with %p or %h specifiers. */
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const char *FilenamePat;
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/* A flag indicating if FilenamePat's memory is allocated
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* by runtime. */
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unsigned OwnsFilenamePat;
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const char *ProfilePathPrefix;
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char PidChars[MAX_PID_SIZE];
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char Hostname[COMPILER_RT_MAX_HOSTLEN];
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unsigned NumPids;
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unsigned NumHosts;
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/* When in-process merging is enabled, this parameter specifies
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* the total number of profile data files shared by all the processes
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* spawned from the same binary. By default the value is 1. If merging
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* is not enabled, its value should be 0. This parameter is specified
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* by the %[0-9]m specifier. For instance %2m enables merging using
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* 2 profile data files. %1m is equivalent to %m. Also %m specifier
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* can only appear once at the end of the name pattern. */
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unsigned MergePoolSize;
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ProfileNameSpecifier PNS;
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} lprofFilename;
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static lprofFilename lprofCurFilename = {0, 0, 0, {0}, {0},
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0, 0, 0, PNS_unknown};
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static int ProfileMergeRequested = 0;
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static int isProfileMergeRequested() { return ProfileMergeRequested; }
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static void setProfileMergeRequested(int EnableMerge) {
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ProfileMergeRequested = EnableMerge;
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}
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static FILE *ProfileFile = NULL;
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static FILE *getProfileFile() { return ProfileFile; }
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static void setProfileFile(FILE *File) { ProfileFile = File; }
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COMPILER_RT_VISIBILITY void __llvm_profile_set_file_object(FILE *File,
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int EnableMerge) {
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if (__llvm_profile_is_continuous_mode_enabled()) {
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PROF_WARN("__llvm_profile_set_file_object(fd=%d) not supported, because "
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"continuous sync mode (%%c) is enabled",
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fileno(File));
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return;
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}
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setProfileFile(File);
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setProfileMergeRequested(EnableMerge);
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}
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static int getCurFilenameLength();
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static const char *getCurFilename(char *FilenameBuf, int ForceUseBuf);
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static unsigned doMerging() {
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return lprofCurFilename.MergePoolSize || isProfileMergeRequested();
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}
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/* Return 1 if there is an error, otherwise return 0. */
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static uint32_t fileWriter(ProfDataWriter *This, ProfDataIOVec *IOVecs,
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uint32_t NumIOVecs) {
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uint32_t I;
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FILE *File = (FILE *)This->WriterCtx;
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char Zeroes[sizeof(uint64_t)] = {0};
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for (I = 0; I < NumIOVecs; I++) {
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if (IOVecs[I].Data) {
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if (fwrite(IOVecs[I].Data, IOVecs[I].ElmSize, IOVecs[I].NumElm, File) !=
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IOVecs[I].NumElm)
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return 1;
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} else if (IOVecs[I].UseZeroPadding) {
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size_t BytesToWrite = IOVecs[I].ElmSize * IOVecs[I].NumElm;
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while (BytesToWrite > 0) {
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size_t PartialWriteLen =
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(sizeof(uint64_t) > BytesToWrite) ? BytesToWrite : sizeof(uint64_t);
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if (fwrite(Zeroes, sizeof(uint8_t), PartialWriteLen, File) !=
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PartialWriteLen) {
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return 1;
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}
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BytesToWrite -= PartialWriteLen;
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}
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} else {
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if (fseek(File, IOVecs[I].ElmSize * IOVecs[I].NumElm, SEEK_CUR) == -1)
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return 1;
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}
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}
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return 0;
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}
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/* TODO: make buffer size controllable by an internal option, and compiler can pass the size
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to runtime via a variable. */
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static uint32_t orderFileWriter(FILE *File, const uint32_t *DataStart) {
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if (fwrite(DataStart, sizeof(uint32_t), INSTR_ORDER_FILE_BUFFER_SIZE, File) !=
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INSTR_ORDER_FILE_BUFFER_SIZE)
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return 1;
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return 0;
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}
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static void initFileWriter(ProfDataWriter *This, FILE *File) {
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This->Write = fileWriter;
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This->WriterCtx = File;
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}
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COMPILER_RT_VISIBILITY ProfBufferIO *
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lprofCreateBufferIOInternal(void *File, uint32_t BufferSz) {
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FreeHook = &free;
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DynamicBufferIOBuffer = (uint8_t *)calloc(BufferSz, 1);
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VPBufferSize = BufferSz;
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ProfDataWriter *fileWriter =
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(ProfDataWriter *)calloc(sizeof(ProfDataWriter), 1);
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initFileWriter(fileWriter, File);
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ProfBufferIO *IO = lprofCreateBufferIO(fileWriter);
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IO->OwnFileWriter = 1;
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return IO;
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}
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static void setupIOBuffer() {
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const char *BufferSzStr = 0;
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BufferSzStr = getenv("LLVM_VP_BUFFER_SIZE");
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if (BufferSzStr && BufferSzStr[0]) {
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VPBufferSize = atoi(BufferSzStr);
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DynamicBufferIOBuffer = (uint8_t *)calloc(VPBufferSize, 1);
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}
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}
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/* Get the size of the profile file. If there are any errors, print the
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* message under the assumption that the profile is being read for merging
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* purposes, and return -1. Otherwise return the file size in the inout param
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* \p ProfileFileSize. */
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static int getProfileFileSizeForMerging(FILE *ProfileFile,
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uint64_t *ProfileFileSize) {
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if (fseek(ProfileFile, 0L, SEEK_END) == -1) {
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PROF_ERR("Unable to merge profile data, unable to get size: %s\n",
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strerror(errno));
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return -1;
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}
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*ProfileFileSize = ftell(ProfileFile);
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/* Restore file offset. */
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if (fseek(ProfileFile, 0L, SEEK_SET) == -1) {
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PROF_ERR("Unable to merge profile data, unable to rewind: %s\n",
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strerror(errno));
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return -1;
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}
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if (*ProfileFileSize > 0 &&
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*ProfileFileSize < sizeof(__llvm_profile_header)) {
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PROF_WARN("Unable to merge profile data: %s\n",
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"source profile file is too small.");
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return -1;
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}
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return 0;
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}
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/* mmap() \p ProfileFile for profile merging purposes, assuming that an
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* exclusive lock is held on the file and that \p ProfileFileSize is the
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* length of the file. Return the mmap'd buffer in the inout variable
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* \p ProfileBuffer. Returns -1 on failure. On success, the caller is
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* responsible for unmapping the mmap'd buffer in \p ProfileBuffer. */
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static int mmapProfileForMerging(FILE *ProfileFile, uint64_t ProfileFileSize,
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char **ProfileBuffer) {
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*ProfileBuffer = mmap(NULL, ProfileFileSize, PROT_READ, MAP_SHARED | MAP_FILE,
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fileno(ProfileFile), 0);
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if (*ProfileBuffer == MAP_FAILED) {
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PROF_ERR("Unable to merge profile data, mmap failed: %s\n",
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strerror(errno));
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return -1;
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}
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if (__llvm_profile_check_compatibility(*ProfileBuffer, ProfileFileSize)) {
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(void)munmap(*ProfileBuffer, ProfileFileSize);
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PROF_WARN("Unable to merge profile data: %s\n",
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"source profile file is not compatible.");
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return -1;
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}
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return 0;
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}
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/* Read profile data in \c ProfileFile and merge with in-memory
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profile counters. Returns -1 if there is fatal error, otheriwse
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0 is returned. Returning 0 does not mean merge is actually
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performed. If merge is actually done, *MergeDone is set to 1.
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*/
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static int doProfileMerging(FILE *ProfileFile, int *MergeDone) {
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uint64_t ProfileFileSize;
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char *ProfileBuffer;
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/* Get the size of the profile on disk. */
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if (getProfileFileSizeForMerging(ProfileFile, &ProfileFileSize) == -1)
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return -1;
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/* Nothing to merge. */
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if (!ProfileFileSize)
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return 0;
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/* mmap() the profile and check that it is compatible with the data in
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* the current image. */
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if (mmapProfileForMerging(ProfileFile, ProfileFileSize, &ProfileBuffer) == -1)
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return -1;
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/* Now start merging */
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__llvm_profile_merge_from_buffer(ProfileBuffer, ProfileFileSize);
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// Truncate the file in case merging of value profile did not happend to
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// prevent from leaving garbage data at the end of the profile file.
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COMPILER_RT_FTRUNCATE(ProfileFile, __llvm_profile_get_size_for_buffer());
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(void)munmap(ProfileBuffer, ProfileFileSize);
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*MergeDone = 1;
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return 0;
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}
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/* Create the directory holding the file, if needed. */
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static void createProfileDir(const char *Filename) {
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size_t Length = strlen(Filename);
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if (lprofFindFirstDirSeparator(Filename)) {
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char *Copy = (char *)COMPILER_RT_ALLOCA(Length + 1);
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strncpy(Copy, Filename, Length + 1);
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__llvm_profile_recursive_mkdir(Copy);
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}
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}
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/* Open the profile data for merging. It opens the file in r+b mode with
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* file locking. If the file has content which is compatible with the
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* current process, it also reads in the profile data in the file and merge
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* it with in-memory counters. After the profile data is merged in memory,
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* the original profile data is truncated and gets ready for the profile
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* dumper. With profile merging enabled, each executable as well as any of
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* its instrumented shared libraries dump profile data into their own data file.
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*/
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static FILE *openFileForMerging(const char *ProfileFileName, int *MergeDone) {
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FILE *ProfileFile = NULL;
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int rc;
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ProfileFile = getProfileFile();
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if (ProfileFile) {
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lprofLockFileHandle(ProfileFile);
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} else {
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createProfileDir(ProfileFileName);
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ProfileFile = lprofOpenFileEx(ProfileFileName);
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}
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if (!ProfileFile)
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return NULL;
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rc = doProfileMerging(ProfileFile, MergeDone);
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if (rc || (!*MergeDone && COMPILER_RT_FTRUNCATE(ProfileFile, 0L)) ||
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fseek(ProfileFile, 0L, SEEK_SET) == -1) {
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PROF_ERR("Profile Merging of file %s failed: %s\n", ProfileFileName,
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strerror(errno));
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fclose(ProfileFile);
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return NULL;
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}
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return ProfileFile;
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}
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static FILE *getFileObject(const char *OutputName) {
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FILE *File;
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File = getProfileFile();
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if (File != NULL) {
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return File;
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}
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return fopen(OutputName, "ab");
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}
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/* Write profile data to file \c OutputName. */
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static int writeFile(const char *OutputName) {
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int RetVal;
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FILE *OutputFile;
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int MergeDone = 0;
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VPMergeHook = &lprofMergeValueProfData;
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if (doMerging())
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OutputFile = openFileForMerging(OutputName, &MergeDone);
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else
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OutputFile = getFileObject(OutputName);
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if (!OutputFile)
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return -1;
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FreeHook = &free;
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setupIOBuffer();
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ProfDataWriter fileWriter;
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initFileWriter(&fileWriter, OutputFile);
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RetVal = lprofWriteData(&fileWriter, lprofGetVPDataReader(), MergeDone);
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if (OutputFile == getProfileFile()) {
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fflush(OutputFile);
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if (doMerging()) {
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lprofUnlockFileHandle(OutputFile);
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}
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} else {
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fclose(OutputFile);
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}
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return RetVal;
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}
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/* Write order data to file \c OutputName. */
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static int writeOrderFile(const char *OutputName) {
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int RetVal;
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FILE *OutputFile;
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OutputFile = fopen(OutputName, "w");
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if (!OutputFile) {
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PROF_WARN("can't open file with mode ab: %s\n", OutputName);
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return -1;
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}
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FreeHook = &free;
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setupIOBuffer();
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const uint32_t *DataBegin = __llvm_profile_begin_orderfile();
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RetVal = orderFileWriter(OutputFile, DataBegin);
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fclose(OutputFile);
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return RetVal;
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}
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#define LPROF_INIT_ONCE_ENV "__LLVM_PROFILE_RT_INIT_ONCE"
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static void truncateCurrentFile(void) {
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const char *Filename;
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char *FilenameBuf;
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FILE *File;
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int Length;
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Length = getCurFilenameLength();
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FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
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Filename = getCurFilename(FilenameBuf, 0);
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if (!Filename)
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return;
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/* Only create the profile directory and truncate an existing profile once.
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* In continuous mode, this is necessary, as the profile is written-to by the
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* runtime initializer. */
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int initialized = getenv(LPROF_INIT_ONCE_ENV) != NULL;
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if (initialized)
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return;
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#if defined(_WIN32)
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_putenv(LPROF_INIT_ONCE_ENV "=" LPROF_INIT_ONCE_ENV);
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#else
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setenv(LPROF_INIT_ONCE_ENV, LPROF_INIT_ONCE_ENV, 1);
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#endif
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/* Create the profile dir (even if online merging is enabled), so that
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* the profile file can be set up if continuous mode is enabled. */
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createProfileDir(Filename);
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/* By pass file truncation to allow online raw profile merging. */
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if (lprofCurFilename.MergePoolSize)
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return;
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/* Truncate the file. Later we'll reopen and append. */
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File = fopen(Filename, "w");
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if (!File)
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return;
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fclose(File);
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}
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#ifndef _MSC_VER
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static void assertIsZero(int *i) {
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if (*i)
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PROF_WARN("Expected flag to be 0, but got: %d\n", *i);
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}
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#endif
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#if !defined(__Fuchsia__) && !defined(_WIN32)
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/* Write a partial profile to \p Filename, which is required to be backed by
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* the open file object \p File. */
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static int writeProfileWithFileObject(const char *Filename, FILE *File) {
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setProfileFile(File);
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int rc = writeFile(Filename);
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if (rc)
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PROF_ERR("Failed to write file \"%s\": %s\n", Filename, strerror(errno));
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setProfileFile(NULL);
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return rc;
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}
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/* Unlock the profile \p File and clear the unlock flag. */
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static void unlockProfile(int *ProfileRequiresUnlock, FILE *File) {
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if (!*ProfileRequiresUnlock) {
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PROF_WARN("%s", "Expected to require profile unlock\n");
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}
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lprofUnlockFileHandle(File);
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*ProfileRequiresUnlock = 0;
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}
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#endif // !defined(__Fuchsia__) && !defined(_WIN32)
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static int writeMMappedFile(FILE *OutputFile, char **Profile) {
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if (!OutputFile)
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return -1;
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/* Write the data into a file. */
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setupIOBuffer();
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ProfDataWriter fileWriter;
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initFileWriter(&fileWriter, OutputFile);
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if (lprofWriteData(&fileWriter, NULL, 0)) {
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PROF_ERR("Failed to write profile: %s\n", strerror(errno));
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return -1;
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}
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fflush(OutputFile);
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/* Get the file size. */
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uint64_t FileSize = ftell(OutputFile);
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/* Map the profile. */
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*Profile = (char *)mmap(
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NULL, FileSize, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(OutputFile), 0);
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if (*Profile == MAP_FAILED) {
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PROF_ERR("Unable to mmap profile: %s\n", strerror(errno));
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return -1;
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}
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return 0;
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}
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|
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static void relocateCounters(void) {
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if (!__llvm_profile_is_continuous_mode_enabled() ||
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!lprofRuntimeCounterRelocation())
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return;
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|
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/* Get the sizes of various profile data sections. Taken from
|
|
* __llvm_profile_get_size_for_buffer(). */
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const __llvm_profile_data *DataBegin = __llvm_profile_begin_data();
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const __llvm_profile_data *DataEnd = __llvm_profile_end_data();
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uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd);
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const uint64_t CountersOffset = sizeof(__llvm_profile_header) +
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(DataSize * sizeof(__llvm_profile_data));
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int Length = getCurFilenameLength();
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char *FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
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const char *Filename = getCurFilename(FilenameBuf, 0);
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if (!Filename)
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return;
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FILE *File = NULL;
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char *Profile = NULL;
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|
|
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) {
|
|
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) {
|
|
fclose(File);
|
|
return;
|
|
}
|
|
}
|
|
|
|
lprofUnlockFileHandle(File);
|
|
}
|
|
|
|
/* Update the profile fields based on the current mapping. */
|
|
__llvm_profile_counter_bias = (intptr_t)Profile -
|
|
(uintptr_t)__llvm_profile_begin_counters() + CountersOffset;
|
|
}
|
|
|
|
static void initializeProfileForContinuousMode(void) {
|
|
if (!__llvm_profile_is_continuous_mode_enabled())
|
|
return;
|
|
|
|
#if defined(__Fuchsia__) || defined(_WIN32)
|
|
PROF_ERR("%s\n", "Continuous mode not yet supported on Fuchsia or Windows.");
|
|
#else // defined(__Fuchsia__) || defined(_WIN32)
|
|
/* 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();
|
|
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 = 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);
|
|
if (!Filename)
|
|
return;
|
|
|
|
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(assertIsZero) 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 {
|
|
/* 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
|
|
* section mapped. */
|
|
File = lprofOpenFileEx(Filename);
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
unlockProfile(&ProfileRequiresUnlock, File);
|
|
#endif // defined(__Fuchsia__) || defined(_WIN32)
|
|
}
|
|
|
|
static const char *DefaultProfileName = "default.profraw";
|
|
static void resetFilenameToDefault(void) {
|
|
if (lprofCurFilename.FilenamePat && lprofCurFilename.OwnsFilenamePat) {
|
|
free((void *)lprofCurFilename.FilenamePat);
|
|
}
|
|
memset(&lprofCurFilename, 0, sizeof(lprofCurFilename));
|
|
lprofCurFilename.FilenamePat = DefaultProfileName;
|
|
lprofCurFilename.PNS = PNS_default;
|
|
}
|
|
|
|
static unsigned getMergePoolSize(const char *FilenamePat, int *I) {
|
|
unsigned J = 0, Num = 0;
|
|
for (;; ++J) {
|
|
char C = FilenamePat[*I + J];
|
|
if (C == 'm') {
|
|
*I += J;
|
|
return Num ? Num : 1;
|
|
}
|
|
if (C < '0' || C > '9')
|
|
break;
|
|
Num = Num * 10 + C - '0';
|
|
|
|
/* If FilenamePat[*I+J] is between '0' and '9', the next byte is guaranteed
|
|
* to be in-bound as the string is null terminated. */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Parses the pattern string \p FilenamePat and stores the result to
|
|
* lprofcurFilename structure. */
|
|
static int parseFilenamePattern(const char *FilenamePat,
|
|
unsigned CopyFilenamePat) {
|
|
int NumPids = 0, NumHosts = 0, I;
|
|
char *PidChars = &lprofCurFilename.PidChars[0];
|
|
char *Hostname = &lprofCurFilename.Hostname[0];
|
|
int MergingEnabled = 0;
|
|
|
|
/* Clean up cached prefix and filename. */
|
|
if (lprofCurFilename.ProfilePathPrefix)
|
|
free((void *)lprofCurFilename.ProfilePathPrefix);
|
|
|
|
if (lprofCurFilename.FilenamePat && lprofCurFilename.OwnsFilenamePat) {
|
|
free((void *)lprofCurFilename.FilenamePat);
|
|
}
|
|
|
|
memset(&lprofCurFilename, 0, sizeof(lprofCurFilename));
|
|
|
|
if (!CopyFilenamePat)
|
|
lprofCurFilename.FilenamePat = FilenamePat;
|
|
else {
|
|
lprofCurFilename.FilenamePat = strdup(FilenamePat);
|
|
lprofCurFilename.OwnsFilenamePat = 1;
|
|
}
|
|
/* Check the filename for "%p", which indicates a pid-substitution. */
|
|
for (I = 0; FilenamePat[I]; ++I)
|
|
if (FilenamePat[I] == '%') {
|
|
if (FilenamePat[++I] == 'p') {
|
|
if (!NumPids++) {
|
|
if (snprintf(PidChars, MAX_PID_SIZE, "%ld", (long)getpid()) <= 0) {
|
|
PROF_WARN("Unable to get pid for filename pattern %s. Using the "
|
|
"default name.",
|
|
FilenamePat);
|
|
return -1;
|
|
}
|
|
}
|
|
} else if (FilenamePat[I] == 'h') {
|
|
if (!NumHosts++)
|
|
if (COMPILER_RT_GETHOSTNAME(Hostname, COMPILER_RT_MAX_HOSTLEN)) {
|
|
PROF_WARN("Unable to get hostname for filename pattern %s. Using "
|
|
"the default name.",
|
|
FilenamePat);
|
|
return -1;
|
|
}
|
|
} else if (FilenamePat[I] == 'c') {
|
|
if (__llvm_profile_is_continuous_mode_enabled()) {
|
|
PROF_WARN("%%c specifier can only be specified once in %s.\n",
|
|
FilenamePat);
|
|
return -1;
|
|
}
|
|
|
|
__llvm_profile_enable_continuous_mode();
|
|
I++; /* advance to 'c' */
|
|
} else {
|
|
unsigned MergePoolSize = getMergePoolSize(FilenamePat, &I);
|
|
if (!MergePoolSize)
|
|
continue;
|
|
if (MergingEnabled) {
|
|
PROF_WARN("%%m specifier can only be specified once in %s.\n",
|
|
FilenamePat);
|
|
return -1;
|
|
}
|
|
MergingEnabled = 1;
|
|
lprofCurFilename.MergePoolSize = MergePoolSize;
|
|
}
|
|
}
|
|
|
|
lprofCurFilename.NumPids = NumPids;
|
|
lprofCurFilename.NumHosts = NumHosts;
|
|
return 0;
|
|
}
|
|
|
|
static void parseAndSetFilename(const char *FilenamePat,
|
|
ProfileNameSpecifier PNS,
|
|
unsigned CopyFilenamePat) {
|
|
|
|
const char *OldFilenamePat = lprofCurFilename.FilenamePat;
|
|
ProfileNameSpecifier OldPNS = lprofCurFilename.PNS;
|
|
|
|
/* The old profile name specifier takes precedence over the old one. */
|
|
if (PNS < OldPNS)
|
|
return;
|
|
|
|
if (!FilenamePat)
|
|
FilenamePat = DefaultProfileName;
|
|
|
|
if (OldFilenamePat && !strcmp(OldFilenamePat, FilenamePat)) {
|
|
lprofCurFilename.PNS = PNS;
|
|
return;
|
|
}
|
|
|
|
/* When PNS >= OldPNS, the last one wins. */
|
|
if (!FilenamePat || parseFilenamePattern(FilenamePat, CopyFilenamePat))
|
|
resetFilenameToDefault();
|
|
lprofCurFilename.PNS = PNS;
|
|
|
|
if (!OldFilenamePat) {
|
|
if (getenv("LLVM_PROFILE_VERBOSE"))
|
|
PROF_NOTE("Set profile file path to \"%s\" via %s.\n",
|
|
lprofCurFilename.FilenamePat, getPNSStr(PNS));
|
|
} else {
|
|
if (getenv("LLVM_PROFILE_VERBOSE"))
|
|
PROF_NOTE("Override old profile path \"%s\" via %s to \"%s\" via %s.\n",
|
|
OldFilenamePat, getPNSStr(OldPNS), lprofCurFilename.FilenamePat,
|
|
getPNSStr(PNS));
|
|
}
|
|
|
|
truncateCurrentFile();
|
|
if (__llvm_profile_is_continuous_mode_enabled()) {
|
|
if (lprofRuntimeCounterRelocation())
|
|
relocateCounters();
|
|
else
|
|
initializeProfileForContinuousMode();
|
|
}
|
|
}
|
|
|
|
/* 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 24
|
|
static int getCurFilenameLength() {
|
|
int Len;
|
|
if (!lprofCurFilename.FilenamePat || !lprofCurFilename.FilenamePat[0])
|
|
return 0;
|
|
|
|
if (!(lprofCurFilename.NumPids || lprofCurFilename.NumHosts ||
|
|
lprofCurFilename.MergePoolSize))
|
|
return strlen(lprofCurFilename.FilenamePat);
|
|
|
|
Len = strlen(lprofCurFilename.FilenamePat) +
|
|
lprofCurFilename.NumPids * (strlen(lprofCurFilename.PidChars) - 2) +
|
|
lprofCurFilename.NumHosts * (strlen(lprofCurFilename.Hostname) - 2);
|
|
if (lprofCurFilename.MergePoolSize)
|
|
Len += SIGLEN;
|
|
return Len;
|
|
}
|
|
|
|
/* 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) {
|
|
int I, J, PidLength, HostNameLength, FilenamePatLength;
|
|
const char *FilenamePat = lprofCurFilename.FilenamePat;
|
|
|
|
if (!lprofCurFilename.FilenamePat || !lprofCurFilename.FilenamePat[0])
|
|
return 0;
|
|
|
|
if (!(lprofCurFilename.NumPids || lprofCurFilename.NumHosts ||
|
|
lprofCurFilename.MergePoolSize ||
|
|
__llvm_profile_is_continuous_mode_enabled())) {
|
|
if (!ForceUseBuf)
|
|
return lprofCurFilename.FilenamePat;
|
|
|
|
FilenamePatLength = strlen(lprofCurFilename.FilenamePat);
|
|
memcpy(FilenameBuf, lprofCurFilename.FilenamePat, FilenamePatLength);
|
|
FilenameBuf[FilenamePatLength] = '\0';
|
|
return FilenameBuf;
|
|
}
|
|
|
|
PidLength = strlen(lprofCurFilename.PidChars);
|
|
HostNameLength = strlen(lprofCurFilename.Hostname);
|
|
/* Construct the new filename. */
|
|
for (I = 0, J = 0; FilenamePat[I]; ++I)
|
|
if (FilenamePat[I] == '%') {
|
|
if (FilenamePat[++I] == 'p') {
|
|
memcpy(FilenameBuf + J, lprofCurFilename.PidChars, PidLength);
|
|
J += PidLength;
|
|
} else if (FilenamePat[I] == 'h') {
|
|
memcpy(FilenameBuf + J, lprofCurFilename.Hostname, HostNameLength);
|
|
J += HostNameLength;
|
|
} else {
|
|
if (!getMergePoolSize(FilenamePat, &I))
|
|
continue;
|
|
char LoadModuleSignature[SIGLEN + 1];
|
|
int S;
|
|
int ProfilePoolId = getpid() % lprofCurFilename.MergePoolSize;
|
|
S = snprintf(LoadModuleSignature, SIGLEN + 1, "%" PRIu64 "_%d",
|
|
lprofGetLoadModuleSignature(), ProfilePoolId);
|
|
if (S == -1 || S > SIGLEN)
|
|
S = SIGLEN;
|
|
memcpy(FilenameBuf + J, LoadModuleSignature, S);
|
|
J += S;
|
|
}
|
|
/* Drop any unknown substitutions. */
|
|
} else
|
|
FilenameBuf[J++] = FilenamePat[I];
|
|
FilenameBuf[J] = 0;
|
|
|
|
return FilenameBuf;
|
|
}
|
|
|
|
/* Returns the pointer to the environment variable
|
|
* string. Returns null if the env var is not set. */
|
|
static const char *getFilenamePatFromEnv(void) {
|
|
const char *Filename = getenv("LLVM_PROFILE_FILE");
|
|
if (!Filename || !Filename[0])
|
|
return 0;
|
|
return Filename;
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
const char *__llvm_profile_get_path_prefix(void) {
|
|
int Length;
|
|
char *FilenameBuf, *Prefix;
|
|
const char *Filename, *PrefixEnd;
|
|
|
|
if (lprofCurFilename.ProfilePathPrefix)
|
|
return lprofCurFilename.ProfilePathPrefix;
|
|
|
|
Length = getCurFilenameLength();
|
|
FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
|
|
Filename = getCurFilename(FilenameBuf, 0);
|
|
if (!Filename)
|
|
return "\0";
|
|
|
|
PrefixEnd = lprofFindLastDirSeparator(Filename);
|
|
if (!PrefixEnd)
|
|
return "\0";
|
|
|
|
Length = PrefixEnd - Filename + 1;
|
|
Prefix = (char *)malloc(Length + 1);
|
|
if (!Prefix) {
|
|
PROF_ERR("Failed to %s\n", "allocate memory.");
|
|
return "\0";
|
|
}
|
|
memcpy(Prefix, Filename, Length);
|
|
Prefix[Length] = '\0';
|
|
lprofCurFilename.ProfilePathPrefix = Prefix;
|
|
return Prefix;
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
const char *__llvm_profile_get_filename(void) {
|
|
int Length;
|
|
char *FilenameBuf;
|
|
const char *Filename;
|
|
|
|
Length = getCurFilenameLength();
|
|
FilenameBuf = (char *)malloc(Length + 1);
|
|
if (!FilenameBuf) {
|
|
PROF_ERR("Failed to %s\n", "allocate memory.");
|
|
return "\0";
|
|
}
|
|
Filename = getCurFilename(FilenameBuf, 1);
|
|
if (!Filename)
|
|
return "\0";
|
|
|
|
return FilenameBuf;
|
|
}
|
|
|
|
/* 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) {
|
|
const char *EnvFilenamePat;
|
|
const char *SelectedPat = NULL;
|
|
ProfileNameSpecifier PNS = PNS_unknown;
|
|
int hasCommandLineOverrider = (INSTR_PROF_PROFILE_NAME_VAR[0] != 0);
|
|
|
|
if (__llvm_profile_counter_bias != -1)
|
|
lprofSetRuntimeCounterRelocation(1);
|
|
|
|
EnvFilenamePat = getFilenamePatFromEnv();
|
|
if (EnvFilenamePat) {
|
|
/* Pass CopyFilenamePat = 1, to ensure that the filename would be valid
|
|
at the moment when __llvm_profile_write_file() gets executed. */
|
|
parseAndSetFilename(EnvFilenamePat, PNS_environment, 1);
|
|
return;
|
|
} else if (hasCommandLineOverrider) {
|
|
SelectedPat = INSTR_PROF_PROFILE_NAME_VAR;
|
|
PNS = PNS_command_line;
|
|
} else {
|
|
SelectedPat = NULL;
|
|
PNS = PNS_default;
|
|
}
|
|
|
|
parseAndSetFilename(SelectedPat, PNS, 0);
|
|
}
|
|
|
|
/* This method is invoked by the runtime initialization hook
|
|
* InstrProfilingRuntime.o if it is linked in.
|
|
*/
|
|
COMPILER_RT_VISIBILITY
|
|
void __llvm_profile_initialize(void) {
|
|
__llvm_profile_initialize_file();
|
|
if (!__llvm_profile_is_continuous_mode_enabled())
|
|
__llvm_profile_register_write_file_atexit();
|
|
}
|
|
|
|
/* 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) {
|
|
if (__llvm_profile_is_continuous_mode_enabled())
|
|
return;
|
|
parseAndSetFilename(FilenamePat, PNS_runtime_api, 1);
|
|
}
|
|
|
|
/* 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) {
|
|
int rc, Length;
|
|
const char *Filename;
|
|
char *FilenameBuf;
|
|
int PDeathSig = 0;
|
|
|
|
if (lprofProfileDumped() || __llvm_profile_is_continuous_mode_enabled()) {
|
|
PROF_NOTE("Profile data not written to file: %s.\n", "already written");
|
|
return 0;
|
|
}
|
|
|
|
Length = getCurFilenameLength();
|
|
FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
|
|
Filename = getCurFilename(FilenameBuf, 0);
|
|
|
|
/* Check the filename. */
|
|
if (!Filename) {
|
|
PROF_ERR("Failed to write file : %s\n", "Filename not set");
|
|
return -1;
|
|
}
|
|
|
|
/* Check if there is llvm/runtime version mismatch. */
|
|
if (GET_VERSION(__llvm_profile_get_version()) != INSTR_PROF_RAW_VERSION) {
|
|
PROF_ERR("Runtime and instrumentation version mismatch : "
|
|
"expected %d, but get %d\n",
|
|
INSTR_PROF_RAW_VERSION,
|
|
(int)GET_VERSION(__llvm_profile_get_version()));
|
|
return -1;
|
|
}
|
|
|
|
// Temporarily suspend getting SIGKILL when the parent exits.
|
|
PDeathSig = lprofSuspendSigKill();
|
|
|
|
/* Write profile data to the file. */
|
|
rc = writeFile(Filename);
|
|
if (rc)
|
|
PROF_ERR("Failed to write file \"%s\": %s\n", Filename, strerror(errno));
|
|
|
|
// Restore SIGKILL.
|
|
if (PDeathSig == 1)
|
|
lprofRestoreSigKill();
|
|
|
|
return rc;
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
int __llvm_profile_dump(void) {
|
|
if (!doMerging())
|
|
PROF_WARN("Later invocation of __llvm_profile_dump can lead to clobbering "
|
|
" of previously dumped profile data : %s. Either use %%m "
|
|
"in profile name or change profile name before dumping.\n",
|
|
"online profile merging is not on");
|
|
int rc = __llvm_profile_write_file();
|
|
lprofSetProfileDumped(1);
|
|
return rc;
|
|
}
|
|
|
|
/* Order file data will be saved in a file with suffx .order. */
|
|
static const char *OrderFileSuffix = ".order";
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
int __llvm_orderfile_write_file(void) {
|
|
int rc, Length, LengthBeforeAppend, SuffixLength;
|
|
const char *Filename;
|
|
char *FilenameBuf;
|
|
int PDeathSig = 0;
|
|
|
|
SuffixLength = strlen(OrderFileSuffix);
|
|
Length = getCurFilenameLength() + SuffixLength;
|
|
FilenameBuf = (char *)COMPILER_RT_ALLOCA(Length + 1);
|
|
Filename = getCurFilename(FilenameBuf, 1);
|
|
|
|
/* Check the filename. */
|
|
if (!Filename) {
|
|
PROF_ERR("Failed to write file : %s\n", "Filename not set");
|
|
return -1;
|
|
}
|
|
|
|
/* Append order file suffix */
|
|
LengthBeforeAppend = strlen(Filename);
|
|
memcpy(FilenameBuf + LengthBeforeAppend, OrderFileSuffix, SuffixLength);
|
|
FilenameBuf[LengthBeforeAppend + SuffixLength] = '\0';
|
|
|
|
/* Check if there is llvm/runtime version mismatch. */
|
|
if (GET_VERSION(__llvm_profile_get_version()) != INSTR_PROF_RAW_VERSION) {
|
|
PROF_ERR("Runtime and instrumentation version mismatch : "
|
|
"expected %d, but get %d\n",
|
|
INSTR_PROF_RAW_VERSION,
|
|
(int)GET_VERSION(__llvm_profile_get_version()));
|
|
return -1;
|
|
}
|
|
|
|
// Temporarily suspend getting SIGKILL when the parent exits.
|
|
PDeathSig = lprofSuspendSigKill();
|
|
|
|
/* Write order data to the file. */
|
|
rc = writeOrderFile(Filename);
|
|
if (rc)
|
|
PROF_ERR("Failed to write file \"%s\": %s\n", Filename, strerror(errno));
|
|
|
|
// Restore SIGKILL.
|
|
if (PDeathSig == 1)
|
|
lprofRestoreSigKill();
|
|
|
|
return rc;
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
int __llvm_orderfile_dump(void) {
|
|
int rc = __llvm_orderfile_write_file();
|
|
return rc;
|
|
}
|
|
|
|
static void writeFileWithoutReturn(void) { __llvm_profile_write_file(); }
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
int __llvm_profile_register_write_file_atexit(void) {
|
|
static int HasBeenRegistered = 0;
|
|
|
|
if (HasBeenRegistered)
|
|
return 0;
|
|
|
|
lprofSetupValueProfiler();
|
|
|
|
HasBeenRegistered = 1;
|
|
return atexit(writeFileWithoutReturn);
|
|
}
|
|
|
|
#endif
|