74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ProfilerCodeAddressService.h"
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#include "platform.h"
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#include "mozilla/StackWalk.h"
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using namespace mozilla;
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#if defined(XP_LINUX) || defined(XP_FREEBSD)
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static char* SearchSymbolTable(SymbolTable& aTable, uint32_t aOffset) {
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size_t index;
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bool exact =
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BinarySearch(aTable.mAddrs, 0, aTable.mAddrs.Length(), aOffset, &index);
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if (index == 0 && !exact) {
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// Our offset is before the first symbol in the table; no result.
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return nullptr;
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}
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// Extract the (mangled) symbol name out of the string table.
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auto strings = reinterpret_cast<char*>(aTable.mBuffer.Elements());
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nsCString symbol;
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symbol.Append(strings + aTable.mIndex[index - 1],
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aTable.mIndex[index] - aTable.mIndex[index - 1]);
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// First try demangling as a Rust identifier.
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char demangled[1024];
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if (!profiler_demangle_rust(symbol.get(), demangled, std::size(demangled))) {
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// Then as a C++ identifier.
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DemangleSymbol(symbol.get(), demangled, std::size(demangled));
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}
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demangled[std::size(demangled) - 1] = '\0';
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// Use the mangled name if we didn't successfully demangle.
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return strdup(demangled[0] != '\0' ? demangled : symbol.get());
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}
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#endif
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bool ProfilerCodeAddressService::GetFunction(const void* aPc,
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nsACString& aResult) {
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Entry& entry = GetEntry(aPc);
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#if defined(XP_LINUX) || defined(XP_FREEBSD)
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// On Linux, most symbols will not be found by the MozDescribeCodeAddress call
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// that GetEntry does. So we read the symbol table directly from the ELF
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// image.
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// SymbolTable currently assumes library offsets will not be larger than
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// 4 GiB.
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if (entry.mLOffset <= 0xFFFFFFFF && !entry.mFunction) {
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auto p = mSymbolTables.lookupForAdd(entry.mLibrary);
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if (!p) {
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if (!mSymbolTables.add(p, entry.mLibrary, SymbolTable())) {
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MOZ_CRASH("ProfilerCodeAddressService OOM");
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}
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profiler_get_symbol_table(entry.mLibrary, nullptr, &p->value());
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}
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entry.mFunction =
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SearchSymbolTable(p->value(), static_cast<uint32_t>(entry.mLOffset));
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}
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#endif
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if (!entry.mFunction || entry.mFunction[0] == '\0') {
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return false;
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}
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aResult = nsDependentCString(entry.mFunction);
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return true;
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}
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