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/*
* Copyright (C) 2011, 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 DFGBasicBlock_h
#define DFGBasicBlock_h
#if ENABLE(DFG_JIT)
#include "DFGAbstractValue.h"
#include "DFGBranchDirection.h"
#include "DFGNode.h"
#include "DFGVariadicFunction.h"
#include "Operands.h"
#include <wtf/OwnPtr.h>
#include <wtf/Vector.h>
namespace JSC { namespace DFG {
class Graph;
typedef Vector <BlockIndex, 2> PredecessorList;
struct BasicBlock : Vector<Node*, 8> {
BasicBlock(unsigned bytecodeBegin, unsigned numArguments, unsigned numLocals)
: bytecodeBegin(bytecodeBegin)
, isOSRTarget(false)
, cfaHasVisited(false)
, cfaShouldRevisit(false)
, cfaFoundConstants(false)
, cfaDidFinish(true)
, cfaBranchDirection(InvalidBranchDirection)
#if !ASSERT_DISABLED
, isLinked(false)
#endif
, isReachable(false)
, variablesAtHead(numArguments, numLocals)
, variablesAtTail(numArguments, numLocals)
, valuesAtHead(numArguments, numLocals)
, valuesAtTail(numArguments, numLocals)
{
}
~BasicBlock()
{
}
void ensureLocals(unsigned newNumLocals)
{
variablesAtHead.ensureLocals(newNumLocals);
variablesAtTail.ensureLocals(newNumLocals);
valuesAtHead.ensureLocals(newNumLocals);
valuesAtTail.ensureLocals(newNumLocals);
}
size_t numNodes() const { return phis.size() + size(); }
Node* node(size_t i) const
{
if (i < phis.size())
return phis[i];
return at(i - phis.size());
}
bool isPhiIndex(size_t i) const { return i < phis.size(); }
bool isInPhis(Node* node) const
{
for (size_t i = 0; i < phis.size(); ++i) {
if (phis[i] == node)
return true;
}
return false;
}
bool isInBlock(Node* myNode) const
{
for (size_t i = 0; i < numNodes(); ++i) {
if (node(i) == myNode)
return true;
}
return false;
}
#define DFG_DEFINE_APPEND_NODE(templatePre, templatePost, typeParams, valueParamsComma, valueParams, valueArgs) \
templatePre typeParams templatePost Node* appendNode(Graph&, SpeculatedType valueParamsComma valueParams);
DFG_VARIADIC_TEMPLATE_FUNCTION(DFG_DEFINE_APPEND_NODE)
#undef DFG_DEFINE_APPEND_NODE
// This value is used internally for block linking and OSR entry. It is mostly meaningless
// for other purposes due to inlining.
unsigned bytecodeBegin;
bool isOSRTarget;
bool cfaHasVisited;
bool cfaShouldRevisit;
bool cfaFoundConstants;
bool cfaDidFinish;
BranchDirection cfaBranchDirection;
#if !ASSERT_DISABLED
bool isLinked;
#endif
bool isReachable;
Vector<Node*> phis;
PredecessorList m_predecessors;
Operands<Node*, NodePointerTraits> variablesAtHead;
Operands<Node*, NodePointerTraits> variablesAtTail;
Operands<AbstractValue> valuesAtHead;
Operands<AbstractValue> valuesAtTail;
};
struct UnlinkedBlock {
BlockIndex m_blockIndex;
bool m_needsNormalLinking;
bool m_needsEarlyReturnLinking;
UnlinkedBlock() { }
explicit UnlinkedBlock(BlockIndex blockIndex)
: m_blockIndex(blockIndex)
, m_needsNormalLinking(true)
, m_needsEarlyReturnLinking(false)
{
}
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
#endif // DFGBasicBlock_h
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