godot/platform/linuxbsd/crash_handler_linuxbsd.cpp
Hugo Locurcio 8556dd1bef
Improve crash handler message display
- State the Godot version and full hash in the backtrace.
- Add decoration around the crash backtrace, both to make it stand out
  from other messages and help the user figure out what they should copy.
2021-06-17 20:05:16 +02:00

163 lines
5.4 KiB
C++

/*************************************************************************/
/* crash_handler_linuxbsd.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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/version.h"
#include "core/version_hash.gen.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 <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");
}
// Dump the backtrace to stderr with a message to the user
fprintf(stderr, "\n================================================================\n");
fprintf(stderr, "%s: Program crashed with signal %d\n", __FUNCTION__, sig);
if (OS::get_singleton()->get_main_loop()) {
OS::get_singleton()->get_main_loop()->notification(MainLoop::NOTIFICATION_CRASH);
}
// Print the engine version just before, so that people are reminded to include the version in backtrace reports.
if (String(VERSION_HASH).length() != 0) {
fprintf(stderr, "Engine version: " VERSION_FULL_NAME " (" VERSION_HASH ")\n");
} else {
fprintf(stderr, "Engine version: " VERSION_FULL_NAME "\n");
}
fprintf(stderr, "Dumping the backtrace. %s\n", msg.utf8().get_data());
char **strings = backtrace_symbols(bt_buffer, size);
if (strings) {
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;
char *demangled = abi::__cxa_demangle(info.dli_sname, nullptr, nullptr, &status);
if (status == 0 && demangled) {
snprintf(fname, 1024, "%s", demangled);
}
if (demangled) {
free(demangled);
}
}
}
List<String> args;
char str[1024];
snprintf(str, 1024, "%p", bt_buffer[i]);
args.push_back(str);
args.push_back("-e");
args.push_back(_execpath);
String output = "";
// Try to get the file/line number using addr2line
int ret;
Error err = OS::get_singleton()->execute(String("addr2line"), args, &output, &ret);
if (err == OK) {
output.erase(output.length() - 1, 1);
}
fprintf(stderr, "[%ld] %s (%s)\n", (long int)i, fname, output.utf8().get_data());
}
free(strings);
}
fprintf(stderr, "-- END OF BACKTRACE --\n");
fprintf(stderr, "================================================================\n");
// 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
}