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/*
* Copyright (C) 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 PolymorphicAccessStructureList_h
#define PolymorphicAccessStructureList_h
#include "JITStubRoutine.h"
#include "Structure.h"
#include "StructureChain.h"
#include <wtf/Platform.h>
#define POLYMORPHIC_LIST_CACHE_SIZE 8
namespace JSC {
// *Sigh*, If the JIT is enabled we need to track the stubRountine (of type CodeLocationLabel),
// If the JIT is not in use we don't actually need the variable (that said, if the JIT is not in use we don't
// curently actually use PolymorphicAccessStructureLists, which we should). Anyway, this seems like the best
// solution for now - will need to something smarter if/when we actually want mixed-mode operation.
#if ENABLE(JIT)
// Structure used by op_get_by_id_self_list and op_get_by_id_proto_list instruction to hold data off the main opcode stream.
struct PolymorphicAccessStructureList {
WTF_MAKE_FAST_ALLOCATED;
public:
struct PolymorphicStubInfo {
bool isChain;
bool isDirect;
RefPtr<JITStubRoutine> stubRoutine;
WriteBarrier<Structure> base;
union {
WriteBarrierBase<Structure> proto;
WriteBarrierBase<StructureChain> chain;
} u;
PolymorphicStubInfo()
{
u.proto.clear();
}
void set(VM& vm, JSCell* owner, PassRefPtr<JITStubRoutine> _stubRoutine, Structure* _base, bool isDirect)
{
stubRoutine = _stubRoutine;
base.set(vm, owner, _base);
u.proto.clear();
isChain = false;
this->isDirect = isDirect;
}
void set(VM& vm, JSCell* owner, PassRefPtr<JITStubRoutine> _stubRoutine, Structure* _base, Structure* _proto, bool isDirect)
{
stubRoutine = _stubRoutine;
base.set(vm, owner, _base);
u.proto.set(vm, owner, _proto);
isChain = false;
this->isDirect = isDirect;
}
void set(VM& vm, JSCell* owner, PassRefPtr<JITStubRoutine> _stubRoutine, Structure* _base, StructureChain* _chain, bool isDirect)
{
stubRoutine = _stubRoutine;
base.set(vm, owner, _base);
u.chain.set(vm, owner, _chain);
isChain = true;
this->isDirect = isDirect;
}
} list[POLYMORPHIC_LIST_CACHE_SIZE];
PolymorphicAccessStructureList()
{
}
PolymorphicAccessStructureList(VM& vm, JSCell* owner, PassRefPtr<JITStubRoutine> stubRoutine, Structure* firstBase, bool isDirect)
{
list[0].set(vm, owner, stubRoutine, firstBase, isDirect);
}
PolymorphicAccessStructureList(VM& vm, JSCell* owner, PassRefPtr<JITStubRoutine> stubRoutine, Structure* firstBase, Structure* firstProto, bool isDirect)
{
list[0].set(vm, owner, stubRoutine, firstBase, firstProto, isDirect);
}
PolymorphicAccessStructureList(VM& vm, JSCell* owner, PassRefPtr<JITStubRoutine> stubRoutine, Structure* firstBase, StructureChain* firstChain, bool isDirect)
{
list[0].set(vm, owner, stubRoutine, firstBase, firstChain, isDirect);
}
bool visitWeak(int count)
{
for (int i = 0; i < count; ++i) {
PolymorphicStubInfo& info = list[i];
if (!info.base) {
// We're being marked during initialisation of an entry
ASSERT(!info.u.proto);
continue;
}
if (!Heap::isMarked(info.base.get()))
return false;
if (info.u.proto && !info.isChain
&& !Heap::isMarked(info.u.proto.get()))
return false;
if (info.u.chain && info.isChain
&& !Heap::isMarked(info.u.chain.get()))
return false;
}
return true;
}
};
#endif // ENABLE(JIT)
} // namespace JSC
#endif // PolymorphicAccessStructureList_h
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