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/**************************************************************************/
/* crash_handler_linuxbsd.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "crash_handler_linuxbsd.h"
#include "core/config/project_settings.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
#include "core/version.h"
#include "main/main.h"
#ifdef DEBUG_ENABLED
#define CRASH_HANDLER_ENABLED 1
#endif
#ifdef CRASH_HANDLER_ENABLED
#include <cxxabi.h>
#include <dlfcn.h>
#include <execinfo.h>
#include <link.h>
#include <signal.h>
#include <stdlib.h>
static void handle_crash(int sig) {
if (OS::get_singleton() == nullptr) {
abort();
}
void *bt_buffer[256];
size_t size = backtrace(bt_buffer, 256);
String _execpath = OS::get_singleton()->get_executable_path();
String msg;
const ProjectSettings *proj_settings = ProjectSettings::get_singleton();
if (proj_settings) {
msg = proj_settings->get("debug/settings/crash_handler/message");
}
// Tell MainLoop about the crash. This can be handled by users too in Node.
if (OS::get_singleton()->get_main_loop()) {
OS::get_singleton()->get_main_loop()->notification(MainLoop::NOTIFICATION_CRASH);
}
// Dump the backtrace to stderr with a message to the user
print_error("\n================================================================");
print_error(vformat("%s: Program crashed with signal %d", __FUNCTION__, sig));
// Print the engine version just before, so that people are reminded to include the version in backtrace reports.
if (String(VERSION_HASH).is_empty()) {
print_error(vformat("Engine version: %s", VERSION_FULL_NAME));
} else {
print_error(vformat("Engine version: %s (%s)", VERSION_FULL_NAME, VERSION_HASH));
}
print_error(vformat("Dumping the backtrace. %s", msg));
char **strings = backtrace_symbols(bt_buffer, size);
// PIE executable relocation, zero for non-PIE executables
uintptr_t relocation = _r_debug.r_map->l_addr;
if (strings) {
List<String> args;
for (size_t i = 0; i < size; i++) {
char str[1024];
snprintf(str, 1024, "%p", (void *)((uintptr_t)bt_buffer[i] - relocation));
args.push_back(str);
}
args.push_back("-e");
args.push_back(_execpath);
// Try to get the file/line number using addr2line
int ret;
String output = "";
Error err = OS::get_singleton()->execute(String("addr2line"), args, &output, &ret);
Vector<String> addr2line_results;
if (err == OK) {
addr2line_results = output.substr(0, output.length() - 1).split("\n", false);
}
for (size_t i = 1; i < size; i++) {
char fname[1024];
Dl_info info;
snprintf(fname, 1024, "%s", strings[i]);
// Try to demangle the function name to provide a more readable one
if (dladdr(bt_buffer[i], &info) && info.dli_sname) {
if (info.dli_sname[0] == '_') {
int status = 0;
char *demangled = abi::__cxa_demangle(info.dli_sname, nullptr, nullptr, &status);
if (status == 0 && demangled) {
snprintf(fname, 1024, "%s", demangled);
}
if (demangled) {
free(demangled);
}
}
}
print_error(vformat("[%d] %s (%s)", (int64_t)i, fname, err == OK ? addr2line_results[i] : ""));
}
free(strings);
}
print_error("-- END OF BACKTRACE --");
print_error("================================================================");
// Abort to pass the error to the OS
abort();
}
#endif
CrashHandler::CrashHandler() {
disabled = false;
}
CrashHandler::~CrashHandler() {
disable();
}
void CrashHandler::disable() {
if (disabled) {
return;
}
#ifdef CRASH_HANDLER_ENABLED
signal(SIGSEGV, nullptr);
signal(SIGFPE, nullptr);
signal(SIGILL, nullptr);
#endif
disabled = true;
}
void CrashHandler::initialize() {
#ifdef CRASH_HANDLER_ENABLED
signal(SIGSEGV, handle_crash);
signal(SIGFPE, handle_crash);
signal(SIGILL, handle_crash);
#endif
}
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