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/*
* Copyright (C) 2011, 2015 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.
*/
#ifndef VirtualRegister_h
#define VirtualRegister_h
#include "CallFrame.h"
#include <wtf/PrintStream.h>
namespace JSC {
inline bool operandIsLocal(int operand)
{
return operand < 0;
}
inline bool operandIsArgument(int operand)
{
return operand >= 0;
}
class VirtualRegister {
public:
friend VirtualRegister virtualRegisterForLocal(int);
friend VirtualRegister virtualRegisterForArgument(int, int);
VirtualRegister()
: m_virtualRegister(s_invalidVirtualRegister)
{ }
explicit VirtualRegister(int virtualRegister)
: m_virtualRegister(virtualRegister)
{ }
bool isValid() const { return (m_virtualRegister != s_invalidVirtualRegister); }
bool isLocal() const { return operandIsLocal(m_virtualRegister); }
bool isArgument() const { return operandIsArgument(m_virtualRegister); }
bool isHeader() const { return m_virtualRegister >= 0 && m_virtualRegister < JSStack::ThisArgument; }
bool isConstant() const { return m_virtualRegister >= s_firstConstantRegisterIndex; }
int toLocal() const { ASSERT(isLocal()); return operandToLocal(m_virtualRegister); }
int toArgument() const { ASSERT(isArgument()); return operandToArgument(m_virtualRegister); }
int toConstantIndex() const { ASSERT(isConstant()); return m_virtualRegister - s_firstConstantRegisterIndex; }
int offset() const { return m_virtualRegister; }
int offsetInBytes() const { return m_virtualRegister * sizeof(Register); }
bool operator==(VirtualRegister other) const { return m_virtualRegister == other.m_virtualRegister; }
bool operator!=(VirtualRegister other) const { return m_virtualRegister != other.m_virtualRegister; }
bool operator<(VirtualRegister other) const { return m_virtualRegister < other.m_virtualRegister; }
bool operator>(VirtualRegister other) const { return m_virtualRegister > other.m_virtualRegister; }
bool operator<=(VirtualRegister other) const { return m_virtualRegister <= other.m_virtualRegister; }
bool operator>=(VirtualRegister other) const { return m_virtualRegister >= other.m_virtualRegister; }
VirtualRegister operator+(int value) const
{
return VirtualRegister(offset() + value);
}
VirtualRegister operator-(int value) const
{
return VirtualRegister(offset() - value);
}
VirtualRegister operator+(VirtualRegister value) const
{
return VirtualRegister(offset() + value.offset());
}
VirtualRegister operator-(VirtualRegister value) const
{
return VirtualRegister(offset() - value.offset());
}
VirtualRegister& operator+=(int value)
{
return *this = *this + value;
}
VirtualRegister& operator-=(int value)
{
return *this = *this - value;
}
void dump(PrintStream& out) const;
private:
static const int s_invalidVirtualRegister = 0x3fffffff;
static const int s_firstConstantRegisterIndex = 0x40000000;
static int localToOperand(int local) { return -1 - local; }
static int operandToLocal(int operand) { return -1 - operand; }
static int operandToArgument(int operand) { return operand - CallFrame::thisArgumentOffset(); }
static int argumentToOperand(int argument) { return argument + CallFrame::thisArgumentOffset(); }
int m_virtualRegister;
};
COMPILE_ASSERT(sizeof(VirtualRegister) == sizeof(int), VirtualRegister_is_32bit);
inline VirtualRegister virtualRegisterForLocal(int local)
{
return VirtualRegister(VirtualRegister::localToOperand(local));
}
inline VirtualRegister virtualRegisterForArgument(int argument, int offset = 0)
{
return VirtualRegister(VirtualRegister::argumentToOperand(argument) + offset);
}
} // namespace JSC
#endif // VirtualRegister_h
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