diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /tools/profiler/core/ProfilerCodeAddressService.cpp | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.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/ProfilerCodeAddressService.cpp | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/tools/profiler/core/ProfilerCodeAddressService.cpp b/tools/profiler/core/ProfilerCodeAddressService.cpp new file mode 100644 index 0000000000..5a65e06379 --- /dev/null +++ b/tools/profiler/core/ProfilerCodeAddressService.cpp @@ -0,0 +1,75 @@ +/* -*- 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 "ProfilerCodeAddressService.h" + +#include "platform.h" +#include "mozilla/StackWalk.h" + +using namespace mozilla; + +#if defined(XP_LINUX) || defined(XP_FREEBSD) +static char* SearchSymbolTable(SymbolTable& aTable, uint32_t aOffset) { + size_t index; + bool exact = + BinarySearch(aTable.mAddrs, 0, aTable.mAddrs.Length(), aOffset, &index); + + if (index == 0 && !exact) { + // Our offset is before the first symbol in the table; no result. + return nullptr; + } + + // Extract the (mangled) symbol name out of the string table. + auto strings = reinterpret_cast<char*>(aTable.mBuffer.Elements()); + nsCString symbol; + symbol.Append(strings + aTable.mIndex[index - 1], + aTable.mIndex[index] - aTable.mIndex[index - 1]); + + // First try demangling as a Rust identifier. + char demangled[1024]; + if (!profiler_demangle_rust(symbol.get(), demangled, + ArrayLength(demangled))) { + // Then as a C++ identifier. + DemangleSymbol(symbol.get(), demangled, ArrayLength(demangled)); + } + demangled[ArrayLength(demangled) - 1] = '\0'; + + // Use the mangled name if we didn't successfully demangle. + return strdup(demangled[0] != '\0' ? demangled : symbol.get()); +} +#endif + +bool ProfilerCodeAddressService::GetFunction(const void* aPc, + nsACString& aResult) { + Entry& entry = GetEntry(aPc); + +#if defined(XP_LINUX) || defined(XP_FREEBSD) + // On Linux, most symbols will not be found by the MozDescribeCodeAddress call + // that GetEntry does. So we read the symbol table directly from the ELF + // image. + + // SymbolTable currently assumes library offsets will not be larger than + // 4 GiB. + if (entry.mLOffset <= 0xFFFFFFFF && !entry.mFunction) { + auto p = mSymbolTables.lookupForAdd(entry.mLibrary); + if (!p) { + if (!mSymbolTables.add(p, entry.mLibrary, SymbolTable())) { + MOZ_CRASH("ProfilerCodeAddressService OOM"); + } + profiler_get_symbol_table(entry.mLibrary, nullptr, &p->value()); + } + entry.mFunction = + SearchSymbolTable(p->value(), static_cast<uint32_t>(entry.mLOffset)); + } +#endif + + if (!entry.mFunction || entry.mFunction[0] == '\0') { + return false; + } + + aResult = nsDependentCString(entry.mFunction); + return true; +} |