blob: 2158de6bd387117aa786fb5b8219b2b9ce437a0e [file] [log] [blame]
/*
* Copyright (C) 2016-2018 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 "CatchScope.h"
#include "StackAlignment.h"
#include "VM.h"
namespace JSC {
struct EntryFrame;
class SuspendExceptionScope {
public:
SuspendExceptionScope(VM* vm)
: m_vm(vm)
{
auto scope = DECLARE_CATCH_SCOPE(*vm);
oldException = scope.exception();
scope.clearException();
}
~SuspendExceptionScope()
{
m_vm->restorePreviousException(oldException);
}
private:
Exception* oldException;
VM* m_vm;
};
class TopCallFrameSetter {
public:
TopCallFrameSetter(VM& currentVM, CallFrame* callFrame)
: vm(currentVM)
, oldCallFrame(currentVM.topCallFrame)
{
currentVM.topCallFrame = callFrame;
}
~TopCallFrameSetter()
{
vm.topCallFrame = oldCallFrame;
}
private:
VM& vm;
CallFrame* oldCallFrame;
};
ALWAYS_INLINE static void assertStackPointerIsAligned()
{
#ifndef NDEBUG
#if CPU(X86) && !OS(WINDOWS)
uintptr_t stackPointer;
asm("movl %%esp,%0" : "=r"(stackPointer));
ASSERT(!(stackPointer % stackAlignmentBytes()));
#endif
#endif
}
class NativeCallFrameTracer {
public:
ALWAYS_INLINE NativeCallFrameTracer(VM* vm, CallFrame* callFrame)
{
ASSERT(vm);
ASSERT(callFrame);
ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm->topEntryFrame));
assertStackPointerIsAligned();
vm->topCallFrame = callFrame;
}
};
} // namespace JSC