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