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/*
* Copyright (C) 2011 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 DFGDominators_h
#define DFGDominators_h
#include <wtf/Platform.h>
#if ENABLE(DFG_JIT)
#include "DFGCommon.h"
#include <wtf/FastBitVector.h>
namespace JSC { namespace DFG {
class Graph;
class Dominators {
public:
Dominators();
~Dominators();
void compute(Graph& graph);
void invalidate()
{
m_valid = false;
}
void computeIfNecessary(Graph& graph)
{
if (m_valid)
return;
compute(graph);
}
bool isValid() const { return m_valid; }
bool dominates(BlockIndex from, BlockIndex to) const
{
ASSERT(isValid());
return m_results[to].get(from);
}
private:
bool iterateForBlock(Graph& graph, BlockIndex);
Vector<FastBitVector> m_results;
FastBitVector m_scratch;
bool m_valid;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
#endif // DFGDominators_h
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