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/*
* Copyright (C) 2008 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 Instruction_h
#define Instruction_h
#include "Opcode.h"
#include "Structure.h"
#include <wtf/VectorTraits.h>
#define POLYMORPHIC_LIST_CACHE_SIZE 4
namespace JSC {
class JSCell;
class Structure;
class StructureChain;
// 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 {
struct PolymorphicStubInfo {
bool isChain;
void* stubRoutine;
Structure* base;
union {
Structure* proto;
StructureChain* chain;
} u;
void set(void* _stubRoutine, Structure* _base)
{
stubRoutine = _stubRoutine;
base = _base;
u.proto = 0;
isChain = false;
}
void set(void* _stubRoutine, Structure* _base, Structure* _proto)
{
stubRoutine = _stubRoutine;
base = _base;
u.proto = _proto;
isChain = false;
}
void set(void* _stubRoutine, Structure* _base, StructureChain* _chain)
{
stubRoutine = _stubRoutine;
base = _base;
u.chain = _chain;
isChain = true;
}
} list[POLYMORPHIC_LIST_CACHE_SIZE];
PolymorphicAccessStructureList(void* stubRoutine, Structure* firstBase)
{
list[0].set(stubRoutine, firstBase);
}
PolymorphicAccessStructureList(void* stubRoutine, Structure* firstBase, Structure* firstProto)
{
list[0].set(stubRoutine, firstBase, firstProto);
}
PolymorphicAccessStructureList(void* stubRoutine, Structure* firstBase, StructureChain* firstChain)
{
list[0].set(stubRoutine, firstBase, firstChain);
}
void derefStructures(int count)
{
for (int i = 0; i < count; ++i) {
PolymorphicStubInfo& info = list[i];
ASSERT(info.base);
info.base->deref();
if (info.u.proto) {
if (info.isChain)
info.u.chain->deref();
else
info.u.proto->deref();
}
}
}
};
struct Instruction {
Instruction(Opcode opcode) { u.opcode = opcode; }
Instruction(int operand)
{
// We have to initialize one of the pointer members to ensure that
// the entire struct is initialised in 64-bit.
u.jsCell = 0;
u.operand = operand;
}
Instruction(Structure* structure) { u.structure = structure; }
Instruction(StructureChain* structureChain) { u.structureChain = structureChain; }
Instruction(JSCell* jsCell) { u.jsCell = jsCell; }
Instruction(PolymorphicAccessStructureList* polymorphicStructures) { u.polymorphicStructures = polymorphicStructures; }
union {
Opcode opcode;
int operand;
Structure* structure;
StructureChain* structureChain;
JSCell* jsCell;
PolymorphicAccessStructureList* polymorphicStructures;
} u;
};
} // namespace JSC
namespace WTF {
template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { };
} // namespace WTF
#endif // Instruction_h
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