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Operands.h
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269 lines (225 loc) · 8.05 KB
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/*
* Copyright (C) 2011, 2012, 2013 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 Operands_h
#define Operands_h
#include "CallFrame.h"
#include "JSObject.h"
#include "VirtualRegister.h"
#include <wtf/PrintStream.h>
#include <wtf/Vector.h>
namespace JSC {
template<typename T> struct OperandValueTraits;
template<typename T>
struct OperandValueTraits {
static T defaultValue() { return T(); }
static bool isEmptyForDump(const T& value) { return !value; }
};
enum OperandKind { ArgumentOperand, LocalOperand };
enum OperandsLikeTag { OperandsLike };
template<typename T, typename Traits = OperandValueTraits<T>>
class Operands {
public:
Operands() { }
explicit Operands(size_t numArguments, size_t numLocals)
{
m_arguments.fill(Traits::defaultValue(), numArguments);
m_locals.fill(Traits::defaultValue(), numLocals);
}
template<typename U, typename OtherTraits>
explicit Operands(OperandsLikeTag, const Operands<U, OtherTraits>& other)
{
m_arguments.fill(Traits::defaultValue(), other.numberOfArguments());
m_locals.fill(Traits::defaultValue(), other.numberOfLocals());
}
size_t numberOfArguments() const { return m_arguments.size(); }
size_t numberOfLocals() const { return m_locals.size(); }
T& argument(size_t idx) { return m_arguments[idx]; }
const T& argument(size_t idx) const { return m_arguments[idx]; }
T& local(size_t idx) { return m_locals[idx]; }
const T& local(size_t idx) const { return m_locals[idx]; }
template<OperandKind operandKind>
size_t sizeFor() const
{
if (operandKind == ArgumentOperand)
return numberOfArguments();
return numberOfLocals();
}
template<OperandKind operandKind>
T& atFor(size_t idx)
{
if (operandKind == ArgumentOperand)
return argument(idx);
return local(idx);
}
template<OperandKind operandKind>
const T& atFor(size_t idx) const
{
if (operandKind == ArgumentOperand)
return argument(idx);
return local(idx);
}
void ensureLocals(size_t size)
{
if (size <= m_locals.size())
return;
size_t oldSize = m_locals.size();
m_locals.resize(size);
for (size_t i = oldSize; i < m_locals.size(); ++i)
m_locals[i] = Traits::defaultValue();
}
void setLocal(size_t idx, const T& value)
{
ensureLocals(idx + 1);
m_locals[idx] = value;
}
T getLocal(size_t idx)
{
if (idx >= m_locals.size())
return Traits::defaultValue();
return m_locals[idx];
}
void setArgumentFirstTime(size_t idx, const T& value)
{
ASSERT(m_arguments[idx] == Traits::defaultValue());
argument(idx) = value;
}
void setLocalFirstTime(size_t idx, const T& value)
{
ASSERT(idx >= m_locals.size() || m_locals[idx] == Traits::defaultValue());
setLocal(idx, value);
}
T& operand(int operand)
{
if (operandIsArgument(operand)) {
int argument = VirtualRegister(operand).toArgument();
return m_arguments[argument];
}
return m_locals[VirtualRegister(operand).toLocal()];
}
T& operand(VirtualRegister virtualRegister)
{
return operand(virtualRegister.offset());
}
const T& operand(int operand) const { return const_cast<const T&>(const_cast<Operands*>(this)->operand(operand)); }
bool hasOperand(int operand) const
{
if (operandIsArgument(operand))
return true;
return static_cast<size_t>(VirtualRegister(operand).toLocal()) < numberOfLocals();
}
bool hasOperand(VirtualRegister reg) const
{
return hasOperand(reg.offset());
}
void setOperand(int operand, const T& value)
{
if (operandIsArgument(operand)) {
int argument = VirtualRegister(operand).toArgument();
m_arguments[argument] = value;
return;
}
setLocal(VirtualRegister(operand).toLocal(), value);
}
void setOperand(VirtualRegister virtualRegister, const T& value)
{
setOperand(virtualRegister.offset(), value);
}
size_t size() const { return numberOfArguments() + numberOfLocals(); }
const T& at(size_t index) const
{
if (index < numberOfArguments())
return m_arguments[index];
return m_locals[index - numberOfArguments()];
}
T& at(size_t index)
{
if (index < numberOfArguments())
return m_arguments[index];
return m_locals[index - numberOfArguments()];
}
const T& operator[](size_t index) const { return at(index); }
T& operator[](size_t index) { return at(index); }
bool isArgument(size_t index) const { return index < numberOfArguments(); }
bool isVariable(size_t index) const { return !isArgument(index); }
int argumentForIndex(size_t index) const
{
return index;
}
int variableForIndex(size_t index) const
{
return index - m_arguments.size();
}
int operandForIndex(size_t index) const
{
if (index < numberOfArguments())
return virtualRegisterForArgument(index).offset();
return virtualRegisterForLocal(index - numberOfArguments()).offset();
}
size_t indexForOperand(int operand) const
{
if (operandIsArgument(operand))
return static_cast<size_t>(VirtualRegister(operand).toArgument());
return static_cast<size_t>(VirtualRegister(operand).toLocal()) + numberOfArguments();
}
size_t indexForOperand(VirtualRegister reg) const
{
return indexForOperand(reg.offset());
}
void setOperandFirstTime(int operand, const T& value)
{
if (operandIsArgument(operand)) {
setArgumentFirstTime(VirtualRegister(operand).toArgument(), value);
return;
}
setLocalFirstTime(VirtualRegister(operand).toLocal(), value);
}
void fill(T value)
{
for (size_t i = 0; i < m_arguments.size(); ++i)
m_arguments[i] = value;
for (size_t i = 0; i < m_locals.size(); ++i)
m_locals[i] = value;
}
void clear()
{
fill(Traits::defaultValue());
}
bool operator==(const Operands& other) const
{
ASSERT(numberOfArguments() == other.numberOfArguments());
ASSERT(numberOfLocals() == other.numberOfLocals());
return m_arguments == other.m_arguments && m_locals == other.m_locals;
}
void dumpInContext(PrintStream& out, DumpContext* context) const;
void dump(PrintStream& out) const
{
dumpInContext(out, 0);
}
private:
Vector<T, 8> m_arguments;
Vector<T, 16> m_locals;
};
} // namespace JSC
#endif // Operands_h