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243 | /**************************************************************************/
/* crash_handler_windows.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_windows.h"
#include "core/os/os.h"
#include "core/print_string.h"
#include "core/project_settings.h"
#include "core/version.h"
#include "main/main.h"
#ifdef CRASH_HANDLER_EXCEPTION
// Backtrace code 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;
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) :<--- Class 'get_mod_info' has a constructor with 1 argument that is not explicit. [+]Class 'get_mod_info' has a constructor with 1 argument that is not explicit. Such constructors should in general be explicit for type safety reasons. Using the explicit keyword in the constructor means some mistakes when using the class can be avoided.
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;
}
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);
}
print_error("\n================================================================");
print_error(vformat("%s: Program crashed", __FUNCTION__));
// Print the engine version just before, so that people are reminded to include the version in backtrace reports.
if (String(VERSION_HASH).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));
// Load the symbols:
if (!SymInitialize(process, nullptr, false)) {
return EXCEPTION_CONTINUE_SEARCH;
}
SymSetOptions(SymGetOptions() | SYMOPT_LOAD_LINES | SYMOPT_UNDNAME | SYMOPT_EXACT_SYMBOLS);
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;<--- Assignment 'skip_first=false', assigned value is 0
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;
int n = 0;
do {
if (skip_first) {<--- Condition 'skip_first' is always false
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)) {
print_error(vformat("[%d] %s (%s:%d)", n, fnName.c_str(), (char *)line.FileName, (int)line.LineNumber));
} else {
print_error(vformat("[%d] %s", n, fnName.c_str()));
}
} else {
print_error(vformat("[%d] ???", n));
}
n++;
}
if (!StackWalk64(image_type, process, hThread, &frame, context, nullptr, SymFunctionTableAccess64, SymGetModuleBase64, nullptr)) {
break;
}
} while (frame.AddrReturn.Offset != 0 && n < 256);
print_error("-- END OF BACKTRACE --");
print_error("================================================================");
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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