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/*
* Copyright (C) 2012 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 PutByIdStatus_h
#define PutByIdStatus_h
#include "PropertyOffset.h"
#include <wtf/NotFound.h>
namespace JSC {
class CodeBlock;
class Identifier;
class VM;
class JSGlobalObject;
class Structure;
class StructureChain;
class PutByIdStatus {
public:
enum State {
// It's uncached so we have no information.
NoInformation,
// It's cached as a direct store into an object property for cases where the object
// already has the property.
SimpleReplace,
// It's cached as a transition from one structure that lacks the property to one that
// includes the property, and a direct store to this new property.
SimpleTransition,
// It's known to often take slow path.
TakesSlowPath
};
PutByIdStatus()
: m_state(NoInformation)
, m_oldStructure(0)
, m_newStructure(0)
, m_structureChain(0)
, m_offset(invalidOffset)
{
}
explicit PutByIdStatus(State state)
: m_state(state)
, m_oldStructure(0)
, m_newStructure(0)
, m_structureChain(0)
, m_offset(invalidOffset)
{
ASSERT(m_state == NoInformation || m_state == TakesSlowPath);
}
PutByIdStatus(
State state,
Structure* oldStructure,
Structure* newStructure,
StructureChain* structureChain,
PropertyOffset offset)
: m_state(state)
, m_oldStructure(oldStructure)
, m_newStructure(newStructure)
, m_structureChain(structureChain)
, m_offset(offset)
{
ASSERT((m_state == NoInformation || m_state == TakesSlowPath) == !m_oldStructure);
ASSERT((m_state != SimpleTransition) == !m_newStructure);
ASSERT((m_state != SimpleTransition) == !m_structureChain);
ASSERT((m_state == NoInformation || m_state == TakesSlowPath) == (m_offset == invalidOffset));
}
static PutByIdStatus computeFor(CodeBlock*, unsigned bytecodeIndex, Identifier&);
static PutByIdStatus computeFor(VM&, JSGlobalObject*, Structure*, Identifier&, bool isDirect);
State state() const { return m_state; }
bool isSet() const { return m_state != NoInformation; }
bool operator!() const { return m_state == NoInformation; }
bool isSimpleReplace() const { return m_state == SimpleReplace; }
bool isSimpleTransition() const { return m_state == SimpleTransition; }
bool takesSlowPath() const { return m_state == TakesSlowPath; }
Structure* oldStructure() const { return m_oldStructure; }
Structure* newStructure() const { return m_newStructure; }
StructureChain* structureChain() const { return m_structureChain; }
PropertyOffset offset() const { return m_offset; }
private:
static PutByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, Identifier&);
State m_state;
Structure* m_oldStructure;
Structure* m_newStructure;
StructureChain* m_structureChain;
PropertyOffset m_offset;
};
} // namespace JSC
#endif // PutByIdStatus_h
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