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/*
* Copyright (C) 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 FTLLoweredNodeValue_h
#define FTLLoweredNodeValue_h
#if ENABLE(FTL_JIT)
#include "DFGBasicBlock.h"
#include "FTLAbbreviatedTypes.h"
namespace JSC { namespace FTL {
// Represents the act of having lowered a DFG::Node to an LValue, and records the
// DFG::BasicBlock that did the lowering. The LValue is what we use most often, but
// we need to verify that we're in a block that is dominated by the one that did
// the lowering. We're guaranteed that for each DFG::Node, there will be one
// LoweredNodeValue that always dominates all uses of the DFG::Node; but there may
// be others that don't dominate and we're effectively doing opportunistic GVN on
// the lowering code.
class LoweredNodeValue {
public:
LoweredNodeValue()
: m_value(0)
, m_block(0)
{
}
LoweredNodeValue(LValue value, DFG::BasicBlock* block)
: m_value(value)
, m_block(block)
{
ASSERT(m_value);
ASSERT(m_block);
}
bool isSet() const { return !!m_value; }
bool operator!() const { return !isSet(); }
LValue value() const { return m_value; }
DFG::BasicBlock* block() const { return m_block; }
private:
LValue m_value;
DFG::BasicBlock* m_block;
};
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
#endif // FTLLoweredNodeValue_h
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