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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/fml/backtrace.h"
#include <csignal>
#include <sstream>
#include "flutter/fml/build_config.h"
#include "flutter/fml/logging.h"
#include "flutter/fml/paths.h"
#include "flutter/third_party/abseil-cpp/absl/debugging/symbolize.h"
#ifdef FML_OS_WIN
#include <Windows.h>
#include <crtdbg.h>
#include <debugapi.h>
#else // FML_OS_WIN
#include <execinfo.h>
#endif // FML_OS_WIN
namespace fml {
static std::string kKUnknownFrameName = "Unknown";
static std::string GetSymbolName(void* symbol) {
char name[1024];
if (!absl::Symbolize(symbol, name, sizeof(name))) {
return kKUnknownFrameName;
}
return name;
}
static int Backtrace(void** symbols, int size) {
#if FML_OS_WIN
return CaptureStackBackTrace(0, size, symbols, NULL);
#else
return ::backtrace(symbols, size);
#endif // FML_OS_WIN
}
std::string BacktraceHere(size_t offset) {
constexpr size_t kMaxFrames = 256;
void* symbols[kMaxFrames];
const auto available_frames = Backtrace(symbols, kMaxFrames);
if (available_frames <= 0) {
return "";
}
// Exclude here.
offset += 2;
std::stringstream stream;
for (int i = offset; i < available_frames; ++i) {
stream << "Frame " << i - offset << ": " << symbols[i] << " "
<< GetSymbolName(symbols[i]) << std::endl;
}
return stream.str();
}
static size_t kKnownSignalHandlers[] = {
SIGABRT, // abort program
SIGFPE, // floating-point exception
SIGTERM, // software termination signal
SIGSEGV, // segmentation violation
#if !FML_OS_WIN
SIGBUS, // bus error
SIGSYS, // non-existent system call invoked
SIGPIPE, // write on a pipe with no reader
SIGALRM, // real-time timer expired
#endif // !FML_OS_WIN
};
static std::string SignalNameToString(int signal) {
switch (signal) {
case SIGABRT:
return "SIGABRT";
case SIGFPE:
return "SIGFPE";
case SIGSEGV:
return "SIGSEGV";
case SIGTERM:
return "SIGTERM";
#if !FML_OS_WIN
case SIGBUS:
return "SIGBUS";
case SIGSYS:
return "SIGSYS";
case SIGPIPE:
return "SIGPIPE";
case SIGALRM:
return "SIGALRM";
#endif // !FML_OS_WIN
};
return std::to_string(signal);
}
static void ToggleSignalHandlers(bool set);
static void SignalHandler(int signal) {
// We are a crash signal handler. This can only happen once. Since we don't
// want to catch crashes while we are generating the crash reports, disable
// all set signal handlers to their default values before reporting the crash
// and re-raising the signal.
ToggleSignalHandlers(false);
FML_LOG(ERROR) << "Caught signal " << SignalNameToString(signal)
<< " during program execution." << std::endl
<< BacktraceHere(3);
::raise(signal);
}
static void ToggleSignalHandlers(bool set) {
for (size_t i = 0; i < sizeof(kKnownSignalHandlers) / sizeof(size_t); ++i) {
auto signal_name = kKnownSignalHandlers[i];
auto handler = set ? &SignalHandler : SIG_DFL;
if (::signal(signal_name, handler) == SIG_ERR) {
FML_LOG(ERROR) << "Could not attach signal handler for " << signal_name;
}
}
}
void InstallCrashHandler() {
#if FML_OS_WIN
if (!IsDebuggerPresent()) {
_CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
_CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
}
#endif
auto exe_path = fml::paths::GetExecutablePath();
if (exe_path.first) {
absl::InitializeSymbolizer(exe_path.second.c_str());
}
ToggleSignalHandlers(true);
}
bool IsCrashHandlingSupported() {
return true;
}
} // namespace fml