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/*
* Copyright (C) 2014 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 PolymorphicGetByIdList_h
#define PolymorphicGetByIdList_h
#if ENABLE(JIT)
#include "CodeOrigin.h"
#include "MacroAssembler.h"
#include "Opcode.h"
#include "Structure.h"
#include <wtf/Vector.h>
namespace JSC {
class CodeBlock;
struct StructureStubInfo;
class GetByIdAccess {
public:
enum AccessType {
Invalid,
SimpleInline, // This is the patched inline access.
SimpleStub, // This is a stub.
WatchedStub,
Getter,
CustomGetter
};
GetByIdAccess()
: m_type(Invalid)
, m_chainCount(0)
{
}
GetByIdAccess(
VM&, JSCell* owner, AccessType, PassRefPtr<JITStubRoutine>, Structure*,
StructureChain* = 0, unsigned chainCount = 0);
~GetByIdAccess();
static GetByIdAccess fromStructureStubInfo(StructureStubInfo&);
bool isSet() const { return m_type != Invalid; }
bool operator!() const { return !isSet(); }
AccessType type() const { return m_type; }
Structure* structure() const { return m_structure.get(); }
StructureChain* chain() const { return m_chain.get(); }
unsigned chainCount() const { return m_chainCount; }
JITStubRoutine* stubRoutine() const
{
ASSERT(isSet());
return m_stubRoutine.get();
}
bool doesCalls() const { return type() == Getter || type() == CustomGetter; }
bool isWatched() const { return type() == WatchedStub; }
bool isSimple() const { return !doesCalls() && !isWatched(); }
bool visitWeak(RepatchBuffer&) const;
private:
friend class CodeBlock;
AccessType m_type;
unsigned m_chainCount;
WriteBarrier<Structure> m_structure;
WriteBarrier<StructureChain> m_chain;
RefPtr<JITStubRoutine> m_stubRoutine;
};
class PolymorphicGetByIdList {
WTF_MAKE_FAST_ALLOCATED;
public:
// Either creates a new polymorphic get list, or returns the one that is already in
// place.
static PolymorphicGetByIdList* from(StructureStubInfo&);
~PolymorphicGetByIdList();
MacroAssemblerCodePtr currentSlowPathTarget(StructureStubInfo& stubInfo) const;
void addAccess(const GetByIdAccess&);
bool isEmpty() const { return m_list.isEmpty(); }
unsigned size() const { return m_list.size(); }
bool isFull() const;
bool isAlmostFull() const; // True if adding an element would make isFull() true.
const GetByIdAccess& at(unsigned i) const { return m_list[i]; }
const GetByIdAccess& operator[](unsigned i) const { return m_list[i]; }
bool didSelfPatching() const; // Are any of the accesses SimpleInline?
bool visitWeak(RepatchBuffer&) const;
private:
friend class CodeBlock;
PolymorphicGetByIdList(StructureStubInfo&);
Vector<GetByIdAccess, 2> m_list;
};
} // namespace JSC
#endif // ENABLE(JIT)
#endif // PolymorphicGetByIdList_h
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