forked from mirrors/gecko-dev
e5e885ae31
# ignore-this-changeset --HG-- extra : amend_source : 7221c8d15a765df71171099468e7c7faa648f37c extra : histedit_source : a0cce6015636202bff09e35a13f72e03257a7695
117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#if XP_WIN && HAVE_64BIT_BUILD
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# include "MozStackFrameSymbolizer.h"
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# include "MinidumpAnalyzerUtils.h"
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# include "processor/cfi_frame_info.h"
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# include <iostream>
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# include <sstream>
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# include <fstream>
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namespace CrashReporter {
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extern MinidumpAnalyzerOptions gMinidumpAnalyzerOptions;
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using google_breakpad::CFIFrameInfo;
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MozStackFrameSymbolizer::MozStackFrameSymbolizer()
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: StackFrameSymbolizer(nullptr, nullptr) {}
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MozStackFrameSymbolizer::SymbolizerResult
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MozStackFrameSymbolizer::FillSourceLineInfo(const CodeModules* modules,
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const CodeModules* unloaded_modules,
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const SystemInfo* system_info,
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StackFrame* stack_frame) {
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SymbolizerResult ret = StackFrameSymbolizer::FillSourceLineInfo(
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modules, unloaded_modules, system_info, stack_frame);
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if (ret == kNoError && this->HasImplementation() &&
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stack_frame->function_name.empty()) {
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// Breakpad's Stackwalker::InstructionAddressSeemsValid only considers an
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// address valid if it has associated symbols.
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//
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// This makes sense for complete & accurate symbols, but ours may be
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// incomplete or wrong. Returning a function name tells Breakpad we
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// recognize this address as code, so it's OK to use in stack scanning.
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// This function is only called with addresses that land in this module.
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//
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// This allows us to fall back to stack scanning in the case where we were
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// unable to provide CFI.
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stack_frame->function_name = "<unknown code>";
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}
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return ret;
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}
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CFIFrameInfo* MozStackFrameSymbolizer::FindCFIFrameInfo(
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const StackFrame* frame) {
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std::string modulePath;
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// For unit testing, support loading a specified module instead of
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// the real one.
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bool moduleHasBeenReplaced = false;
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if (gMinidumpAnalyzerOptions.forceUseModule.size() > 0) {
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modulePath = gMinidumpAnalyzerOptions.forceUseModule;
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moduleHasBeenReplaced = true;
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} else {
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if (!frame->module) {
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return nullptr;
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}
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modulePath = frame->module->code_file();
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}
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// Get/create the unwind parser.
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auto itMod = mModuleMap.find(modulePath);
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std::shared_ptr<ModuleUnwindParser> unwindParser;
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if (itMod != mModuleMap.end()) {
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unwindParser = itMod->second;
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} else {
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unwindParser.reset(new ModuleUnwindParser(modulePath));
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mModuleMap[modulePath] = unwindParser;
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}
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UnwindCFI cfi;
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DWORD offsetAddr;
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if (moduleHasBeenReplaced) {
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// If we are replacing a module, addresses will never line up.
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// So just act like the 1st entry is correct.
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offsetAddr = unwindParser->GetAnyOffsetAddr();
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} else {
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offsetAddr = frame->instruction - frame->module->base_address();
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}
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if (!unwindParser->GetCFI(offsetAddr, cfi)) {
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return nullptr;
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}
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std::unique_ptr<CFIFrameInfo> rules(new CFIFrameInfo());
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static const size_t exprSize = 50;
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char expr[exprSize];
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if (cfi.stackSize == 0) {
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snprintf(expr, exprSize, "$rsp");
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} else {
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snprintf(expr, exprSize, "$rsp %d +", cfi.stackSize);
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}
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rules->SetCFARule(expr);
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if (cfi.ripOffset == 0) {
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snprintf(expr, exprSize, ".cfa ^");
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} else {
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snprintf(expr, exprSize, ".cfa %d - ^", cfi.ripOffset);
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}
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rules->SetRARule(expr);
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return rules.release();
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}
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} // namespace CrashReporter
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#endif // XP_WIN && HAVE_64BIT_BUILD
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