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/*
* Copyright (C) 2016-2023 Apple Inc. All rights reserved.
*
* 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.
*/
#pragma once
#include <wtf/Compiler.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#include <JavaScriptCore/VM.h>
#include <wtf/StackPointer.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
namespace JSC {
class Exception;
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
#define EXCEPTION_ASSERT(assertion) RELEASE_ASSERT(assertion)
#define EXCEPTION_ASSERT_UNUSED(variable, assertion) RELEASE_ASSERT(assertion)
#define EXCEPTION_ASSERT_WITH_MESSAGE(assertion, message) RELEASE_ASSERT_WITH_MESSAGE(assertion, message)
#if ENABLE(C_LOOP)
#define EXCEPTION_SCOPE_POSITION_FOR_ASAN(vm__) (vm__).currentCLoopStackPointer()
#elif ASAN_ENABLED
#define EXCEPTION_SCOPE_POSITION_FOR_ASAN(vm__) currentStackPointer()
#else
#define EXCEPTION_SCOPE_POSITION_FOR_ASAN(vm__) nullptr
#endif
class ExceptionScope {
public:
VM& vm() const { return m_vm; }
unsigned recursionDepth() const { return m_recursionDepth; }
ALWAYS_INLINE Exception* exception() const { return m_vm.exception(); }
ALWAYS_INLINE void assertNoException() { RELEASE_ASSERT_WITH_MESSAGE(!exception(), "%s", unexpectedExceptionMessage().data()); }
ALWAYS_INLINE void releaseAssertNoException() { RELEASE_ASSERT_WITH_MESSAGE(!exception(), "%s", unexpectedExceptionMessage().data()); }
ALWAYS_INLINE void assertNoExceptionExceptTermination() { RELEASE_ASSERT_WITH_MESSAGE(!exception() || m_vm.hasPendingTerminationException(), "%s", unexpectedExceptionMessage().data()); }
ALWAYS_INLINE void releaseAssertNoExceptionExceptTermination() { RELEASE_ASSERT_WITH_MESSAGE(!exception() || m_vm.hasPendingTerminationException(), "%s", unexpectedExceptionMessage().data()); }
#if ASAN_ENABLED || ENABLE(C_LOOP)
const void* stackPosition() const { return m_location.stackPosition; }
#else
const void* stackPosition() const { return this; }
#endif
[[nodiscard]] inline bool tryClearException();
protected:
ExceptionScope(VM&, ExceptionEventLocation);
ExceptionScope(const ExceptionScope&) = delete;
ExceptionScope(ExceptionScope&&) = default;
~ExceptionScope();
JS_EXPORT_PRIVATE CString unexpectedExceptionMessage();
VM& m_vm;
ExceptionScope* m_previousScope;
ExceptionEventLocation m_location;
unsigned m_recursionDepth;
};
#else // not ENABLE(EXCEPTION_SCOPE_VERIFICATION)
#define EXCEPTION_ASSERT(x) ASSERT(x)
#define EXCEPTION_ASSERT_UNUSED(variable, assertion) ASSERT_UNUSED(variable, assertion)
#define EXCEPTION_ASSERT_WITH_MESSAGE(assertion, message) ASSERT_WITH_MESSAGE(assertion, message)
class ExceptionScope {
public:
ALWAYS_INLINE VM& vm() const { return m_vm; }
ALWAYS_INLINE Exception* exception() const { return m_vm.exception(); }
ALWAYS_INLINE void assertNoException() { ASSERT(!exception()); }
ALWAYS_INLINE void releaseAssertNoException() { RELEASE_ASSERT(!exception()); }
ALWAYS_INLINE void assertNoExceptionExceptTermination() { ASSERT(!exception() || m_vm.hasPendingTerminationException()); }
ALWAYS_INLINE void releaseAssertNoExceptionExceptTermination() { RELEASE_ASSERT(!exception() || m_vm.hasPendingTerminationException()); }
[[nodiscard]] ALWAYS_INLINE bool tryClearException();
protected:
ALWAYS_INLINE ExceptionScope(VM& vm)
: m_vm(vm)
{ }
ExceptionScope(const ExceptionScope&) = delete;
ExceptionScope(ExceptionScope&&) = default;
ALWAYS_INLINE CString unexpectedExceptionMessage() { return { }; }
VM& m_vm;
};
#endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
bool ExceptionScope::tryClearException()
{
SUPPRESS_FORWARD_DECL_ARG Exception* exception = this->exception();
SUPPRESS_FORWARD_DECL_ARG if (exception && m_vm.isTerminationException(exception)) [[unlikely]]
return false;
m_vm.clearException();
return true;
}
#define RETURN_IF_EXCEPTION(scope__, value__) do { \
SUPPRESS_UNCOUNTED_LOCAL JSC::VM& vm = (scope__).vm(); \
EXCEPTION_ASSERT(!!(scope__).exception() == vm.traps().needHandling(JSC::VMTraps::NeedExceptionHandling)); \
if (vm.traps().maybeNeedHandling()) [[unlikely]] { \
if (vm.hasExceptionsAfterHandlingTraps()) \
return value__; \
} \
} while (false)
#define TRY_CLEAR_EXCEPTION(scope__, value__) do { \
if (!(scope__).tryClearException()) [[unlikely]] \
return value__; \
} while (false)
#define RETURN_IF_EXCEPTION_WITH_TRAPS_DEFERRED(scope__, value__) do { \
if ((scope__).exception()) [[unlikely]] \
return value__; \
} while (false)
#define RELEASE_AND_RETURN(scope__, expression__) do { \
scope__.release(); \
return expression__; \
} while (false)
} // namespace JSC
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