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/*
* Copyright (C) 2012 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 "MacroAssemblerCodeRef.h"
namespace JSC {
class VM;
class ExecState;
struct Instruction;
class AbstractPC {
public:
AbstractPC()
: m_mode(None)
{
}
AbstractPC(VM&, ExecState*);
#if ENABLE(JIT)
AbstractPC(ReturnAddressPtr ptr)
: m_pointer(ptr.value())
, m_mode(JIT)
{
}
bool hasJITReturnAddress() const { return m_mode == JIT; }
ReturnAddressPtr jitReturnAddress() const
{
ASSERT(hasJITReturnAddress());
return ReturnAddressPtr(m_pointer);
}
#endif
bool isSet() const { return m_mode != None; }
bool operator!() const { return !isSet(); }
private:
#if ENABLE(JIT)
const void* m_pointer { nullptr };
#endif
enum Mode { None, JIT, Interpreter };
Mode m_mode;
};
} // namespace JSC