137 lines
5.2 KiB
C++
137 lines
5.2 KiB
C++
/*
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* Copyright (C) 2011-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "BytecodeConventions.h"
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#include "CallFrame.h"
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#include <wtf/PrintStream.h>
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namespace JSC {
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inline bool virtualRegisterIsLocal(int operand)
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{
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return operand < 0;
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}
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inline bool virtualRegisterIsArgument(int operand)
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{
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return operand >= 0;
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}
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class RegisterID;
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class VirtualRegister {
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public:
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friend VirtualRegister virtualRegisterForLocal(int);
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friend VirtualRegister virtualRegisterForArgumentIncludingThis(int, int);
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static constexpr int invalidVirtualRegister = 0x3fffffff;
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static constexpr int firstConstantRegisterIndex = FirstConstantRegisterIndex;
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VirtualRegister(RegisterID*);
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VirtualRegister(RefPtr<RegisterID>);
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VirtualRegister()
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: m_virtualRegister(invalidVirtualRegister)
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{ }
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explicit VirtualRegister(int virtualRegister)
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: m_virtualRegister(virtualRegister)
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{ }
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VirtualRegister(CallFrameSlot slot)
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: m_virtualRegister(static_cast<int>(slot))
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{ }
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bool isValid() const { return (m_virtualRegister != invalidVirtualRegister); }
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bool isLocal() const { return virtualRegisterIsLocal(m_virtualRegister); }
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bool isArgument() const { return virtualRegisterIsArgument(m_virtualRegister); }
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bool isHeader() const { return m_virtualRegister >= 0 && m_virtualRegister < CallFrameSlot::thisArgument; }
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bool isConstant() const { return m_virtualRegister >= firstConstantRegisterIndex; }
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int toLocal() const { ASSERT(isLocal()); return operandToLocal(m_virtualRegister); }
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int toArgument() const { ASSERT(isArgument()); return operandToArgument(m_virtualRegister); }
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int toConstantIndex() const { ASSERT(isConstant()); return m_virtualRegister - firstConstantRegisterIndex; }
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int offset() const { return m_virtualRegister; }
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int offsetInBytes() const { return m_virtualRegister * sizeof(Register); }
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bool operator==(VirtualRegister other) const { return m_virtualRegister == other.m_virtualRegister; }
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bool operator!=(VirtualRegister other) const { return m_virtualRegister != other.m_virtualRegister; }
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bool operator<(VirtualRegister other) const { return m_virtualRegister < other.m_virtualRegister; }
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bool operator>(VirtualRegister other) const { return m_virtualRegister > other.m_virtualRegister; }
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bool operator<=(VirtualRegister other) const { return m_virtualRegister <= other.m_virtualRegister; }
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bool operator>=(VirtualRegister other) const { return m_virtualRegister >= other.m_virtualRegister; }
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VirtualRegister operator+(int value) const
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{
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return VirtualRegister(offset() + value);
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}
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VirtualRegister operator-(int value) const
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{
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return VirtualRegister(offset() - value);
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}
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VirtualRegister operator+(VirtualRegister value) const
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{
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return VirtualRegister(offset() + value.offset());
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}
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VirtualRegister operator-(VirtualRegister value) const
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{
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return VirtualRegister(offset() - value.offset());
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}
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VirtualRegister& operator+=(int value)
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{
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return *this = *this + value;
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}
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VirtualRegister& operator-=(int value)
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{
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return *this = *this - value;
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}
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void dump(PrintStream& out) const;
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private:
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static int localToOperand(int local) { return -1 - local; }
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static int operandToLocal(int operand) { return -1 - operand; }
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static int operandToArgument(int operand) { return operand - CallFrame::thisArgumentOffset(); }
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static int argumentToOperand(int argument) { return argument + CallFrame::thisArgumentOffset(); }
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int m_virtualRegister;
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};
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COMPILE_ASSERT(sizeof(VirtualRegister) == sizeof(int), VirtualRegister_is_32bit);
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inline VirtualRegister virtualRegisterForLocal(int local)
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{
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return VirtualRegister(VirtualRegister::localToOperand(local));
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}
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inline VirtualRegister virtualRegisterForArgumentIncludingThis(int argument, int offset = 0)
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{
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return VirtualRegister(VirtualRegister::argumentToOperand(argument) + offset);
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}
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} // namespace JSC
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