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/*
* Copyright (C) 2016-2022 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 StructureStubInfo;
class SuspendExceptionScope {
public:
SuspendExceptionScope(VM& vm)
: m_vm(vm)
, m_exceptionWasSet(vm.m_exception)
, m_savedException(vm.m_exception, nullptr)
, m_savedLastException(vm.m_lastException, nullptr)
{
if (m_exceptionWasSet)
m_vm.traps().clearTrapBit(VMTraps::NeedExceptionHandling);
}
~SuspendExceptionScope()
{
if (m_exceptionWasSet)
m_vm.traps().setTrapBit(VMTraps::NeedExceptionHandling);
}
private:
VM& m_vm;
bool m_exceptionWasSet;
SetForScope<Exception*> m_savedException;
SetForScope<Exception*> m_savedLastException;
};
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 SlowPathFrameTracer {
public:
ALWAYS_INLINE SlowPathFrameTracer(VM& vm, CallFrame* callFrame)
{
ASSERT(callFrame);
ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm.topEntryFrame));
assertStackPointerIsAligned();
vm.topCallFrame = callFrame;
}
};
class NativeCallFrameTracer {
public:
ALWAYS_INLINE NativeCallFrameTracer(VM& vm, CallFrame* callFrame)
{
ASSERT(callFrame);
ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm.topEntryFrame));
assertStackPointerIsAligned();
vm.topCallFrame = callFrame;
}
};
class JITOperationPrologueCallFrameTracer {
public:
ALWAYS_INLINE JITOperationPrologueCallFrameTracer(VM& vm, CallFrame* callFrame)
#if ASSERT_ENABLED
: m_vm(vm)
#endif
{
UNUSED_PARAM(vm);
UNUSED_PARAM(callFrame);
ASSERT(callFrame);
ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm.topEntryFrame));
assertStackPointerIsAligned();
#if USE(BUILTIN_FRAME_ADDRESS)
// If ASSERT_ENABLED and USE(BUILTIN_FRAME_ADDRESS), prepareCallOperation() will put the frame pointer into vm.topCallFrame.
// We can ensure here that a call to prepareCallOperation() (or its equivalent) is not missing by comparing vm.topCallFrame to
// the result of __builtin_frame_address which is passed in as callFrame.
ASSERT(vm.topCallFrame == callFrame);
vm.topCallFrame = callFrame;
#endif
}
#if ASSERT_ENABLED
~JITOperationPrologueCallFrameTracer()
{
// Fill vm.topCallFrame with invalid value when leaving from JIT operation functions.
m_vm.topCallFrame = std::bit_cast<CallFrame*>(static_cast<uintptr_t>(0x0badbeef0badbeefULL));
}
VM& m_vm;
#endif
};
class ICSlowPathCallFrameTracer {
public:
inline ICSlowPathCallFrameTracer(VM&, CallFrame*, StructureStubInfo*);
#if ASSERT_ENABLED
~ICSlowPathCallFrameTracer()
{
// Fill vm.topCallFrame with invalid value when leaving from JIT operation functions.
m_vm.topCallFrame = std::bit_cast<CallFrame*>(static_cast<uintptr_t>(0x0badbeef0badbeefULL));
}
VM& m_vm;
#endif
};
} // namespace JSC
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