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/*************************************************************************/
/* crash_handler_windows.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_windows.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 CRASH_HANDLER_EXCEPTION
// Backtrace code based on: https://stackoverflow.com/questions/6205981/windows-c-stack-trace-from-a-running-app
#include <algorithm>
#include <iterator>
#include <string>
#include <vector>
#include <psapi.h>
#pragma comment(lib, "psapi.lib")
#pragma comment(lib, "dbghelp.lib")
// Some versions of imagehlp.dll lack the proper packing directives themselves
// so we need to do it.
#pragma pack(push, before_imagehlp, 8)
#include <imagehlp.h>
#pragma pack(pop, before_imagehlp)
struct module_data {
std::string image_name;
std::string module_name;
void *base_address = nullptr;
DWORD load_size;
};
class symbol {
typedef IMAGEHLP_SYMBOL64 sym_type;
sym_type *sym;
static const int max_name_len = 1024;
public:
symbol(HANDLE process, DWORD64 address) :
sym((sym_type *)::operator new(sizeof(*sym) + max_name_len)) {
memset(sym, '\0', sizeof(*sym) + max_name_len);
sym->SizeOfStruct = sizeof(*sym);
sym->MaxNameLength = max_name_len;
DWORD64 displacement;
SymGetSymFromAddr64(process, address, &displacement, sym);
}
std::string name() { return std::string(sym->Name); }
std::string undecorated_name() {
if (*sym->Name == '\0')
return "<couldn't map PC to fn name>";
std::vector<char> und_name(max_name_len);
UnDecorateSymbolName(sym->Name, &und_name[0], max_name_len, UNDNAME_COMPLETE);
return std::string(&und_name[0], strlen(&und_name[0]));
}
};
class get_mod_info {
HANDLE process;
public:
get_mod_info(HANDLE h) :
process(h) {}
module_data operator()(HMODULE module) {
module_data ret;
char temp[4096];
MODULEINFO mi;
GetModuleInformation(process, module, &mi, sizeof(mi));
ret.base_address = mi.lpBaseOfDll;
ret.load_size = mi.SizeOfImage;
GetModuleFileNameEx(process, module, temp, sizeof(temp));
ret.image_name = temp;
GetModuleBaseName(process, module, temp, sizeof(temp));
ret.module_name = temp;
std::vector<char> img(ret.image_name.begin(), ret.image_name.end());
std::vector<char> mod(ret.module_name.begin(), ret.module_name.end());
SymLoadModule64(process, 0, &img[0], &mod[0], (DWORD64)ret.base_address, ret.load_size);
return ret;
}
};
DWORD CrashHandlerException(EXCEPTION_POINTERS *ep) {
HANDLE process = GetCurrentProcess();
HANDLE hThread = GetCurrentThread();
DWORD offset_from_symbol = 0;
IMAGEHLP_LINE64 line = { 0 };
std::vector<module_data> modules;
DWORD cbNeeded;
std::vector<HMODULE> module_handles(1);
if (OS::get_singleton() == nullptr || OS::get_singleton()->is_disable_crash_handler() || IsDebuggerPresent()) {
return EXCEPTION_CONTINUE_SEARCH;
}
fprintf(stderr, "\n================================================================\n");
fprintf(stderr, "%s: Program crashed\n", __FUNCTION__);
if (OS::get_singleton()->get_main_loop())
OS::get_singleton()->get_main_loop()->notification(MainLoop::NOTIFICATION_CRASH);
// Load the symbols:
if (!SymInitialize(process, nullptr, false))
return EXCEPTION_CONTINUE_SEARCH;
SymSetOptions(SymGetOptions() | SYMOPT_LOAD_LINES | SYMOPT_UNDNAME);
EnumProcessModules(process, &module_handles[0], module_handles.size() * sizeof(HMODULE), &cbNeeded);
module_handles.resize(cbNeeded / sizeof(HMODULE));
EnumProcessModules(process, &module_handles[0], module_handles.size() * sizeof(HMODULE), &cbNeeded);
std::transform(module_handles.begin(), module_handles.end(), std::back_inserter(modules), get_mod_info(process));
void *base = modules[0].base_address;
// Setup stuff:
CONTEXT *context = ep->ContextRecord;
STACKFRAME64 frame;
bool skip_first = false;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrStack.Mode = AddrModeFlat;
frame.AddrFrame.Mode = AddrModeFlat;
#ifdef _M_X64
frame.AddrPC.Offset = context->Rip;
frame.AddrStack.Offset = context->Rsp;
frame.AddrFrame.Offset = context->Rbp;
#else
frame.AddrPC.Offset = context->Eip;
frame.AddrStack.Offset = context->Esp;
frame.AddrFrame.Offset = context->Ebp;
// Skip the first one to avoid a duplicate on 32-bit mode
skip_first = true;
#endif
line.SizeOfStruct = sizeof(line);
IMAGE_NT_HEADERS *h = ImageNtHeader(base);
DWORD image_type = h->FileHeader.Machine;
String msg;
const ProjectSettings *proj_settings = ProjectSettings::get_singleton();
if (proj_settings) {
msg = proj_settings->get("debug/settings/crash_handler/message");
}
// 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());
int n = 0;
do {
if (skip_first) {
skip_first = false;
} else {
if (frame.AddrPC.Offset != 0) {
std::string fnName = symbol(process, frame.AddrPC.Offset).undecorated_name();
if (SymGetLineFromAddr64(process, frame.AddrPC.Offset, &offset_from_symbol, &line))
fprintf(stderr, "[%d] %s (%s:%d)\n", n, fnName.c_str(), line.FileName, line.LineNumber);
else
fprintf(stderr, "[%d] %s\n", n, fnName.c_str());
} else
fprintf(stderr, "[%d] ???\n", n);
n++;
}
if (!StackWalk64(image_type, process, hThread, &frame, context, nullptr, SymFunctionTableAccess64, SymGetModuleBase64, nullptr))
break;
} while (frame.AddrReturn.Offset != 0 && n < 256);
fprintf(stderr, "-- END OF BACKTRACE --\n");
fprintf(stderr, "================================================================\n");
SymCleanup(process);
// Pass the exception to the OS
return EXCEPTION_CONTINUE_SEARCH;
}
#endif
CrashHandler::CrashHandler() {
disabled = false;
}
CrashHandler::~CrashHandler() {
}
void CrashHandler::disable() {
if (disabled)
return;
disabled = true;
}
void CrashHandler::initialize() {
}
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