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Signals.cpp implementation for Windows #16396
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| * Copyright (C) 2023 Ian Grunert <ian.grunert@gmail.com> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in the | ||
| * documentation and/or other materials provided with the distribution. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | ||
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | ||
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | ||
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | ||
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
|
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| #include "config.h" | ||
| #include <wtf/threads/Signals.h> | ||
|
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| #if OS(WINDOWS) | ||
|
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| #include <cstdio> | ||
| #include <mutex> | ||
| #include <signal.h> | ||
| #include <winnt.h> | ||
|
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| #include <wtf/Atomics.h> | ||
| #include <wtf/DataLog.h> | ||
| #include <wtf/MathExtras.h> | ||
| #include <wtf/NeverDestroyed.h> | ||
| #include <wtf/PlatformRegisters.h> | ||
| #include <wtf/ThreadGroup.h> | ||
| #include <wtf/Threading.h> | ||
| #include <wtf/WTFConfig.h> | ||
|
|
||
| namespace WTF { | ||
|
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| void SignalHandlers::add(Signal signal, SignalHandler&& handler) | ||
| { | ||
| Config::AssertNotFrozenScope assertScope; | ||
| static Lock lock; | ||
| Locker locker { lock }; | ||
|
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| size_t signalIndex = static_cast<size_t>(signal); | ||
| size_t nextFree = numberOfHandlers[signalIndex]; | ||
| RELEASE_ASSERT(nextFree < maxNumberOfHandlers); | ||
| SignalHandlerMemory* memory = &handlers[signalIndex][nextFree]; | ||
| new (memory) SignalHandler(WTFMove(handler)); | ||
|
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| // We deliberately do not want to increment the count until after we've | ||
| // fully initialized the memory. This way, forEachHandler() won't see a | ||
| // partially initialized handler. | ||
| storeStoreFence(); | ||
| numberOfHandlers[signalIndex]++; | ||
| loadLoadFence(); | ||
| } | ||
|
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| template<typename Func> | ||
| inline void SignalHandlers::forEachHandler(Signal signal, const Func& func) const | ||
| { | ||
| size_t signalIndex = static_cast<size_t>(signal); | ||
| size_t handlerIndex = numberOfHandlers[signalIndex]; | ||
| while (handlerIndex--) { | ||
| auto* memory = const_cast<SignalHandlerMemory*>(&handlers[signalIndex][handlerIndex]); | ||
| const SignalHandler& handler = *bitwise_cast<SignalHandler*>(memory); | ||
| func(handler); | ||
| } | ||
| } | ||
|
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| inline Signal fromSystemException(int signal) | ||
| { | ||
| switch (signal) { | ||
| case EXCEPTION_FLT_DENORMAL_OPERAND: | ||
| case EXCEPTION_FLT_DIVIDE_BY_ZERO: | ||
| case EXCEPTION_FLT_INEXACT_RESULT: | ||
| case EXCEPTION_FLT_INVALID_OPERATION: | ||
| case EXCEPTION_FLT_OVERFLOW: | ||
| case EXCEPTION_FLT_STACK_CHECK: | ||
| case EXCEPTION_FLT_UNDERFLOW: | ||
| return Signal::FloatingPoint; | ||
| case EXCEPTION_ILLEGAL_INSTRUCTION: | ||
| return Signal::IllegalInstruction; | ||
| case EXCEPTION_ACCESS_VIOLATION: | ||
| return Signal::AccessFault; | ||
| default: | ||
| return Signal::Unknown; | ||
| } | ||
| } | ||
|
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| LONG WINAPI vectoredHandler(struct _EXCEPTION_POINTERS *exceptionInfo) | ||
| { | ||
| Signal signal = fromSystemException(exceptionInfo->ExceptionRecord->ExceptionCode); | ||
| SignalHandlers& handlers = g_wtfConfig.signalHandlers; | ||
|
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| SigInfo sigInfo; | ||
| if (signal == Signal::AccessFault) { | ||
| // The second array element specifies the virtual address of the inaccessible data. | ||
| // https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-exception_record | ||
| sigInfo.faultingAddress = reinterpret_cast<void*>(exceptionInfo->ExceptionRecord->ExceptionInformation[1]); | ||
| } | ||
|
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| PlatformRegisters& registers = *(exceptionInfo->ContextRecord); | ||
|
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| long result = EXCEPTION_EXECUTE_HANDLER; | ||
| handlers.forEachHandler(signal, [&] (const SignalHandler& handler) { | ||
| switch (handler(signal, sigInfo, registers)) { | ||
| case SignalAction::Handled: | ||
| result = EXCEPTION_CONTINUE_EXECUTION; | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
| }); | ||
|
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| return result; | ||
| } | ||
|
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| void addSignalHandler(Signal signal, SignalHandler&& handler) | ||
| { | ||
| Config::AssertNotFrozenScope assertScope; | ||
| SignalHandlers& handlers = g_wtfConfig.signalHandlers; | ||
| ASSERT(signal < Signal::Unknown); | ||
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| static std::once_flag initializeOnceFlags[static_cast<size_t>(Signal::NumberOfSignals)]; | ||
| std::call_once(initializeOnceFlags[static_cast<size_t>(signal)], [&] { | ||
| Config::AssertNotFrozenScope assertScope; | ||
| AddVectoredExceptionHandler(1, vectoredHandler); | ||
| }); | ||
|
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| handlers.add(signal, WTFMove(handler)); | ||
| } | ||
|
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| void activateSignalHandlersFor(Signal signal) | ||
| { | ||
| UNUSED_PARAM(signal); | ||
| } | ||
|
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| void SignalHandlers::initialize() | ||
| { | ||
| // noop | ||
| } | ||
|
|
||
| } // namespace WTF | ||
|
|
||
| #endif // OS(WINDOWS) |
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Put this at the top of the block and the build should go back to green.