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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /tools/profiler/core/shared-libraries-linux.cc | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tools/profiler/core/shared-libraries-linux.cc | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/tools/profiler/core/shared-libraries-linux.cc b/tools/profiler/core/shared-libraries-linux.cc new file mode 100644 index 0000000000..2991e64909 --- /dev/null +++ b/tools/profiler/core/shared-libraries-linux.cc @@ -0,0 +1,280 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "shared-libraries.h" + +#define PATH_MAX_TOSTRING(x) #x +#define PATH_MAX_STRING(x) PATH_MAX_TOSTRING(x) +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <limits.h> +#include <unistd.h> +#include <fstream> +#include "platform.h" +#include "shared-libraries.h" +#include "GeckoProfiler.h" +#include "mozilla/Sprintf.h" +#include "mozilla/Unused.h" +#include "nsDebug.h" +#include "nsNativeCharsetUtils.h" +#include <nsTArray.h> + +#include "common/linux/file_id.h" +#include <algorithm> +#include <dlfcn.h> +#if defined(GP_OS_linux) || defined(GP_OS_android) +# include <features.h> +#endif +#include <sys/types.h> + +#if defined(GP_OS_linux) || defined(GP_OS_android) || defined(GP_OS_freebsd) +# include <link.h> // dl_phdr_info +#else +# error "Unexpected configuration" +#endif + +#if defined(GP_OS_android) +extern "C" MOZ_EXPORT __attribute__((weak)) int dl_iterate_phdr( + int (*callback)(struct dl_phdr_info* info, size_t size, void* data), + void* data); +#endif + +struct LoadedLibraryInfo { + LoadedLibraryInfo(const char* aName, unsigned long aBaseAddress, + unsigned long aFirstMappingStart, + unsigned long aLastMappingEnd) + : mName(aName), + mBaseAddress(aBaseAddress), + mFirstMappingStart(aFirstMappingStart), + mLastMappingEnd(aLastMappingEnd) {} + + nsCString mName; + unsigned long mBaseAddress; + unsigned long mFirstMappingStart; + unsigned long mLastMappingEnd; +}; + +static nsCString IDtoUUIDString( + const google_breakpad::wasteful_vector<uint8_t>& aIdentifier) { + using namespace google_breakpad; + + nsCString uuid; + const std::string str = FileID::ConvertIdentifierToUUIDString(aIdentifier); + uuid.Append(str.c_str(), str.size()); + // This is '0', not '\0', since it represents the breakpad id age. + uuid.Append('0'); + return uuid; +} + +// Return raw Build ID in hex. +static nsCString IDtoString( + const google_breakpad::wasteful_vector<uint8_t>& aIdentifier) { + using namespace google_breakpad; + + nsCString uuid; + const std::string str = FileID::ConvertIdentifierToString(aIdentifier); + uuid.Append(str.c_str(), str.size()); + return uuid; +} + +// Get the breakpad Id for the binary file pointed by bin_name +static nsCString getBreakpadId(const char* bin_name) { + using namespace google_breakpad; + + PageAllocator allocator; + auto_wasteful_vector<uint8_t, kDefaultBuildIdSize> identifier(&allocator); + + FileID file_id(bin_name); + if (file_id.ElfFileIdentifier(identifier)) { + return IDtoUUIDString(identifier); + } + + return ""_ns; +} + +// Get the code Id for the binary file pointed by bin_name +static nsCString getCodeId(const char* bin_name) { + using namespace google_breakpad; + + PageAllocator allocator; + auto_wasteful_vector<uint8_t, kDefaultBuildIdSize> identifier(&allocator); + + FileID file_id(bin_name); + if (file_id.ElfFileIdentifier(identifier)) { + return IDtoString(identifier); + } + + return ""_ns; +} + +static SharedLibrary SharedLibraryAtPath(const char* path, + unsigned long libStart, + unsigned long libEnd, + unsigned long offset = 0) { + nsAutoString pathStr; + mozilla::Unused << NS_WARN_IF( + NS_FAILED(NS_CopyNativeToUnicode(nsDependentCString(path), pathStr))); + + nsAutoString nameStr = pathStr; + int32_t pos = nameStr.RFindChar('/'); + if (pos != kNotFound) { + nameStr.Cut(0, pos + 1); + } + + return SharedLibrary(libStart, libEnd, offset, getBreakpadId(path), + getCodeId(path), nameStr, pathStr, nameStr, pathStr, + ""_ns, ""); +} + +static int dl_iterate_callback(struct dl_phdr_info* dl_info, size_t size, + void* data) { + auto libInfoList = reinterpret_cast<nsTArray<LoadedLibraryInfo>*>(data); + + if (dl_info->dlpi_phnum <= 0) return 0; + + unsigned long baseAddress = dl_info->dlpi_addr; + unsigned long firstMappingStart = -1; + unsigned long lastMappingEnd = 0; + + for (size_t i = 0; i < dl_info->dlpi_phnum; i++) { + if (dl_info->dlpi_phdr[i].p_type != PT_LOAD) { + continue; + } + unsigned long start = dl_info->dlpi_addr + dl_info->dlpi_phdr[i].p_vaddr; + unsigned long end = start + dl_info->dlpi_phdr[i].p_memsz; + if (start < firstMappingStart) { + firstMappingStart = start; + } + if (end > lastMappingEnd) { + lastMappingEnd = end; + } + } + + libInfoList->AppendElement(LoadedLibraryInfo( + dl_info->dlpi_name, baseAddress, firstMappingStart, lastMappingEnd)); + + return 0; +} + +SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf() { + SharedLibraryInfo info; + +#if defined(GP_OS_linux) + // We need to find the name of the executable (exeName, exeNameLen) and the + // address of its executable section (exeExeAddr) in the running image. + char exeName[PATH_MAX]; + memset(exeName, 0, sizeof(exeName)); + + ssize_t exeNameLen = readlink("/proc/self/exe", exeName, sizeof(exeName) - 1); + if (exeNameLen == -1) { + // readlink failed for whatever reason. Note this, but keep going. + exeName[0] = '\0'; + exeNameLen = 0; + LOG("SharedLibraryInfo::GetInfoForSelf(): readlink failed"); + } else { + // Assert no buffer overflow. + MOZ_RELEASE_ASSERT(exeNameLen >= 0 && + exeNameLen < static_cast<ssize_t>(sizeof(exeName))); + } + + unsigned long exeExeAddr = 0; +#endif + +#if defined(GP_OS_android) + // If dl_iterate_phdr doesn't exist, we give up immediately. + if (!dl_iterate_phdr) { + // On ARM Android, dl_iterate_phdr is provided by the custom linker. + // So if libxul was loaded by the system linker (e.g. as part of + // xpcshell when running tests), it won't be available and we should + // not call it. + return info; + } +#endif + +#if defined(GP_OS_linux) || defined(GP_OS_android) + // Read info from /proc/self/maps. We ignore most of it. + pid_t pid = profiler_current_process_id().ToNumber(); + char path[PATH_MAX]; + SprintfLiteral(path, "/proc/%d/maps", pid); + std::ifstream maps(path); + std::string line; + while (std::getline(maps, line)) { + int ret; + unsigned long start; + unsigned long end; + char perm[6 + 1] = ""; + unsigned long offset; + char modulePath[PATH_MAX + 1] = ""; + ret = sscanf(line.c_str(), + "%lx-%lx %6s %lx %*s %*x %" PATH_MAX_STRING(PATH_MAX) "s\n", + &start, &end, perm, &offset, modulePath); + if (!strchr(perm, 'x')) { + // Ignore non executable entries + continue; + } + if (ret != 5 && ret != 4) { + LOG("SharedLibraryInfo::GetInfoForSelf(): " + "reading /proc/self/maps failed"); + continue; + } + +# if defined(GP_OS_linux) + // Try to establish the main executable's load address. + if (exeNameLen > 0 && strcmp(modulePath, exeName) == 0) { + exeExeAddr = start; + } +# elif defined(GP_OS_android) + // Use /proc/pid/maps to get the dalvik-jit section since it has no + // associated phdrs. + if (0 == strcmp(modulePath, "/dev/ashmem/dalvik-jit-code-cache")) { + info.AddSharedLibrary( + SharedLibraryAtPath(modulePath, start, end, offset)); + if (info.GetSize() > 10000) { + LOG("SharedLibraryInfo::GetInfoForSelf(): " + "implausibly large number of mappings acquired"); + break; + } + } +# endif + } +#endif + + nsTArray<LoadedLibraryInfo> libInfoList; + + // We collect the bulk of the library info using dl_iterate_phdr. + dl_iterate_phdr(dl_iterate_callback, &libInfoList); + + for (const auto& libInfo : libInfoList) { + info.AddSharedLibrary( + SharedLibraryAtPath(libInfo.mName.get(), libInfo.mFirstMappingStart, + libInfo.mLastMappingEnd, + libInfo.mFirstMappingStart - libInfo.mBaseAddress)); + } + +#if defined(GP_OS_linux) + // Make another pass over the information we just harvested from + // dl_iterate_phdr. If we see a nameless object mapped at what we earlier + // established to be the main executable's load address, attach the + // executable's name to that entry. + for (size_t i = 0; i < info.GetSize(); i++) { + SharedLibrary& lib = info.GetMutableEntry(i); + if (lib.GetStart() <= exeExeAddr && exeExeAddr <= lib.GetEnd() && + lib.GetNativeDebugPath().empty()) { + lib = SharedLibraryAtPath(exeName, lib.GetStart(), lib.GetEnd(), + lib.GetOffset()); + + // We only expect to see one such entry. + break; + } + } +#endif + + return info; +} + +void SharedLibraryInfo::Initialize() { /* do nothing */ +} |