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/*
* Copyright (C) 2011, 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.
*/
#ifndef Operands_h
#define Operands_h
#include "CallFrame.h"
#include "JSObject.h"
#include "ScopeChain.h"
#include <wtf/Vector.h>
namespace JSC {
// argument 0 is 'this'.
inline bool operandIsArgument(int operand) { return operand < 0; }
inline int operandToArgument(int operand) { return -operand + CallFrame::thisArgumentOffset(); }
inline int argumentToOperand(int argument) { return -argument + CallFrame::thisArgumentOffset(); }
template<typename T> struct OperandValueTraits;
template<typename T>
struct OperandValueTraits {
static T defaultValue() { return T(); }
static void dump(const T& value, FILE* out) { value.dump(out); }
};
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);
}
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]; }
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 = operandToArgument(operand);
return m_arguments[argument];
}
return m_locals[operand];
}
const T& operand(int operand) const { return const_cast<const T&>(const_cast<Operands*>(this)->operand(operand)); }
void setOperand(int operand, const T& value)
{
if (operandIsArgument(operand)) {
int argument = operandToArgument(operand);
m_arguments[argument] = value;
return;
}
setLocal(operand, value);
}
void clear()
{
for (size_t i = 0; i < m_arguments.size(); ++i)
m_arguments[i] = Traits::defaultValue();
for (size_t i = 0; i < m_locals.size(); ++i)
m_locals[i] = Traits::defaultValue();
}
private:
Vector<T, 8> m_arguments;
Vector<T, 16> m_locals;
};
template<typename T, typename Traits>
void dumpOperands(Operands<T, Traits>& operands, FILE* out)
{
for (size_t argument = 0; argument < operands.numberOfArguments(); ++argument) {
if (argument)
fprintf(out, " ");
Traits::dump(operands.argument(argument), out);
}
fprintf(out, " : ");
for (size_t local = 0; local < operands.numberOfLocals(); ++local) {
if (local)
fprintf(out, " ");
Traits::dump(operands.local(local), out);
}
}
} // namespace JSC
#endif // Operands_h
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