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/*
* Copyright (C) 2012, 2013, 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.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "DFGDoubleFormatState.h"
#include "DFGVariableAccessData.h"
#include "DFGVariableAccessDataDump.h"
#include "SpeculatedType.h"
namespace JSC { namespace DFG {
class ArgumentPosition {
public:
ArgumentPosition()
: m_prediction(SpecNone)
, m_doubleFormatState(EmptyDoubleFormatState)
, m_isProfitableToUnbox(false)
, m_shouldNeverUnbox(false)
{
}
void addVariable(VariableAccessData* variable)
{
m_variables.append(variable);
// We may set this early. Merging it here saves us time in prediction propagation.
variable->mergeShouldNeverUnbox(m_shouldNeverUnbox);
}
VariableAccessData* someVariable() const
{
if (m_variables.isEmpty())
return nullptr;
return m_variables[0]->find();
}
FlushFormat flushFormat() const
{
if (VariableAccessData* variable = someVariable())
return variable->flushFormat();
return DeadFlush;
}
bool mergeShouldNeverUnbox(bool shouldNeverUnbox)
{
return checkAndSet(m_shouldNeverUnbox, m_shouldNeverUnbox || shouldNeverUnbox);
}
bool mergeArgumentPredictionAwareness()
{
bool changed = false;
for (unsigned i = 0; i < m_variables.size(); ++i) {
VariableAccessData* variable = m_variables[i]->find();
changed |= mergeSpeculation(m_prediction, variable->argumentAwarePrediction());
changed |= mergeDoubleFormatState(m_doubleFormatState, variable->doubleFormatState());
changed |= mergeShouldNeverUnbox(variable->shouldNeverUnbox());
}
if (!changed)
return false;
changed = false;
for (unsigned i = 0; i < m_variables.size(); ++i) {
VariableAccessData* variable = m_variables[i]->find();
changed |= variable->mergeArgumentAwarePrediction(m_prediction);
changed |= variable->mergeDoubleFormatState(m_doubleFormatState);
changed |= variable->mergeShouldNeverUnbox(m_shouldNeverUnbox);
}
return changed;
}
bool mergeArgumentUnboxingAwareness()
{
bool changed = false;
for (unsigned i = 0; i < m_variables.size(); ++i) {
VariableAccessData* variable = m_variables[i]->find();
changed |= checkAndSet(m_isProfitableToUnbox, m_isProfitableToUnbox || variable->isProfitableToUnbox());
}
if (!changed)
return false;
changed = false;
for (unsigned i = 0; i < m_variables.size(); ++i) {
VariableAccessData* variable = m_variables[i]->find();
changed |= variable->mergeIsProfitableToUnbox(m_isProfitableToUnbox);
}
return changed;
}
bool shouldUnboxIfPossible() const { return m_isProfitableToUnbox && !m_shouldNeverUnbox; }
SpeculatedType prediction() const { return m_prediction; }
DoubleFormatState doubleFormatState() const { return m_doubleFormatState; }
bool shouldUseDoubleFormat() const
{
return doubleFormatState() == UsingDoubleFormat && shouldUnboxIfPossible();
}
void dump(PrintStream& out, Graph* graph)
{
for (unsigned i = 0; i < m_variables.size(); ++i) {
VariableAccessData* variable = m_variables[i]->find();
Operand operand = variable->operand();
if (i)
out.print(" ");
out.print(operand, "(", VariableAccessDataDump(*graph, variable), ")");
}
out.print("\n");
}
private:
SpeculatedType m_prediction;
DoubleFormatState m_doubleFormatState;
bool m_isProfitableToUnbox;
bool m_shouldNeverUnbox;
Vector<VariableAccessData*, 2> m_variables;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
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