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* Copyright (C) 2011 Apple Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef DFGBasicBlock_h
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#define DFGBasicBlock_h
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#include "DFGAbstractValue.h"
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#include "DFGBranchDirection.h"
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#include <wtf/OwnPtr.h>
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#include <wtf/Vector.h>
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namespace JSC { namespace DFG {
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typedef Vector <BlockIndex, 2> PredecessorList;
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struct BasicBlock : Vector<NodeIndex, 8> {
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BasicBlock(unsigned bytecodeBegin, unsigned numArguments, unsigned numLocals)
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: bytecodeBegin(bytecodeBegin)
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, cfaHasVisited(false)
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, cfaShouldRevisit(false)
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, cfaFoundConstants(false)
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, cfaBranchDirection(InvalidBranchDirection)
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, variablesAtHead(numArguments, numLocals)
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, variablesAtTail(numArguments, numLocals)
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, valuesAtHead(numArguments, numLocals)
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, valuesAtTail(numArguments, numLocals)
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void ensureLocals(unsigned newNumLocals)
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variablesAtHead.ensureLocals(newNumLocals);
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variablesAtTail.ensureLocals(newNumLocals);
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valuesAtHead.ensureLocals(newNumLocals);
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valuesAtTail.ensureLocals(newNumLocals);
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size_t numNodes() const { return phis.size() + size(); }
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NodeIndex nodeIndex(size_t i) const
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return at(i - phis.size());
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bool isPhiIndex(size_t i) const { return i < phis.size(); }
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bool isInPhis(NodeIndex nodeIndex) const
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for (size_t i = 0; i < phis.size(); ++i) {
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if (phis[i] == nodeIndex)
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bool isInBlock(NodeIndex index) const
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for (size_t i = 0; i < numNodes(); ++i) {
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if (nodeIndex(i) == index)
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// This value is used internally for block linking and OSR entry. It is mostly meaningless
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// for other purposes due to inlining.
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unsigned bytecodeBegin;
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bool cfaShouldRevisit;
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bool cfaFoundConstants;
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BranchDirection cfaBranchDirection;
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Vector<NodeIndex> phis;
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PredecessorList m_predecessors;
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Operands<NodeIndex, NodeIndexTraits> variablesAtHead;
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Operands<NodeIndex, NodeIndexTraits> variablesAtTail;
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Operands<AbstractValue> valuesAtHead;
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Operands<AbstractValue> valuesAtTail;
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struct UnlinkedBlock {
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BlockIndex m_blockIndex;
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bool m_needsNormalLinking;
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bool m_needsEarlyReturnLinking;
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explicit UnlinkedBlock(BlockIndex blockIndex)
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: m_blockIndex(blockIndex)
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, m_needsNormalLinking(true)
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, m_needsEarlyReturnLinking(false)
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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#endif // DFGBasicBlock_h