/* * 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 #if ENABLE(DFG_JIT) #include "DFGAnalysis.h" #include "DFGBasicBlock.h" #include "DFGCommon.h" #include <wtf/FastBitVector.h> namespace JSC { namespace DFG { class Graph; class Dominators : public Analysis<Dominators> { public: Dominators(); ~Dominators(); void compute(Graph&); bool dominates(BlockIndex from, BlockIndex to) const { ASSERT(isValid()); return m_results[to].get(from); } bool dominates(BasicBlock* from, BasicBlock* to) const { return dominates(from->index, to->index); } void dump(Graph&, PrintStream&) const; private: bool pruneDominators(Graph&, BlockIndex); Vector<FastBitVector> m_results; // For each block, the bitvector of blocks that dominate it. FastBitVector m_scratch; // A temporary bitvector with bit for each block. We recycle this to save new/deletes. }; } } // namespace JSC::DFG #endif // ENABLE(DFG_JIT) #endif // DFGDominators_h