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d13988bd5f
This doesn't have a working symbolicator yet, but it does build and it can obtain a basic backtrace. It also doesn't include a working `swift-backtrace` program yet. rdar://101623384
122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
//===--- CrashHandlerWindows.cpp - Swift crash handler for Windows ------- ===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2025 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// The Windows crash handler implementation.
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//
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//===----------------------------------------------------------------------===//
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include "swift/Runtime/Backtrace.h"
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#include "BacktracePrivate.h"
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using namespace swift::runtime::backtrace;
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namespace {
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SRWLOCK crashLock = SRWLOCK_INIT;
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CrashInfo crashInfo;
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void *pcFromContext(PCONTEXT Context);
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LONG handleException(EXCEPTION_POINTERS *ExceptionInfo);
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LONG reinstallUnhandledExceptionFilter(EXCEPTION_POINTERS *ExceptionInfo);
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}
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namespace swift {
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namespace runtime {
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namespace backtrace {
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SWIFT_RUNTIME_STDLIB_INTERNAL ErrorCode
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_swift_installCrashHandler()
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{
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AddVectoredExceptionHandler(0, reinstallUnhandledExceptionFilter);
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SetUnhandledExceptionFilter(handleException);
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return ERROR_SUCCESS;
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}
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} // namespace backtrace
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} // namespace runtime
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} // namespace swift
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namespace {
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LPTOP_LEVEL_EXCEPTION_FILTER pOldFilter = NULL;
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// Yuck. This is horrible because the C runtime's startup code sets the
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// unhandled exception filter, but that happens *after*
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// _swift_installCrashHandler() has run because *that* is called during DLL
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// initialization.
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//
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// Since we don't have a top-of-main() entry point for Swift, for now we
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// hack things by reinstalling our filter from the vectored exception
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// handler. This is utterly horrible.
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LONG reinstallUnhandledExceptionFilter(EXCEPTION_POINTERS *ExceptionInfo) {
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LPTOP_LEVEL_EXCEPTION_FILTER pFilter = SetUnhandledExceptionFilter(handleException);
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if (pFilter != handleException)
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pOldFilter = pFilter;
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return EXCEPTION_CONTINUE_SEARCH;
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}
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LONG handleException(EXCEPTION_POINTERS *ExceptionInfo) {
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HANDLE hOutput;
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if (_swift_backtraceSettings.outputTo == OutputTo::Stderr)
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hOutput = GetStdHandle(STD_ERROR_HANDLE);
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else
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hOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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AcquireSRWLockExclusive(&crashLock);
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crashInfo.crashing_thread = GetCurrentThreadId();
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crashInfo.signal = ExceptionInfo->ExceptionRecord->ExceptionCode;
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crashInfo.fault_address = (uint64_t)(ExceptionInfo->ExceptionRecord->ExceptionAddress);
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crashInfo.exception_info = (uint64_t)ExceptionInfo;
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_swift_displayCrashMessage(ExceptionInfo->ExceptionRecord->ExceptionCode,
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pcFromContext(ExceptionInfo->ContextRecord));
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// It isn't safe to try to stop all the threads here on Windows, so we
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// delegate doing that to the backtracer process.
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if (!_swift_spawnBacktracer(&crashInfo)) {
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const char *message = _swift_backtraceSettings.color == OnOffTty::On
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? " failed\n\n" : " failed ***\n\n";
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WriteFile(hOutput, message, strlen(message), NULL, NULL);
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}
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ReleaseSRWLockExclusive(&crashLock);
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if (pOldFilter)
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return pOldFilter(ExceptionInfo);
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return EXCEPTION_EXECUTE_HANDLER;
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}
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void *pcFromContext(PCONTEXT Context) {
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#if defined(_M_X64)
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return (void *)(Context->Rip);
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#elif defined(_M_IX86)
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return (void *)(Context->Eip);
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#elif defined(_M_ARM) || defined(_M_ARM64)
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return (void *)(Context->Pc);
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#endif
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}
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} // namespace
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#endif // _WIN32
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