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Diffstat (limited to 'Source/JavaScriptCore/bytecode/Instruction.h')
| -rw-r--r-- | Source/JavaScriptCore/bytecode/Instruction.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/bytecode/Instruction.h b/Source/JavaScriptCore/bytecode/Instruction.h new file mode 100644 index 000000000..7e4413065 --- /dev/null +++ b/Source/JavaScriptCore/bytecode/Instruction.h @@ -0,0 +1,202 @@ +/* + * 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 "MacroAssembler.h" +#include "Opcode.h" +#include "PropertySlot.h" +#include "Structure.h" +#include "StructureChain.h" +#include <wtf/VectorTraits.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. + + class JSCell; + class Structure; + class StructureChain; + +#if ENABLE(JIT) + typedef MacroAssemblerCodeRef PolymorphicAccessStructureListStubRoutineType; + + // 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; + PolymorphicAccessStructureListStubRoutineType stubRoutine; + WriteBarrier<Structure> base; + union { + WriteBarrierBase<Structure> proto; + WriteBarrierBase<StructureChain> chain; + } u; + + PolymorphicStubInfo() + { + u.proto.clear(); + } + + void set(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, bool isDirect) + { + stubRoutine = _stubRoutine; + base.set(globalData, owner, _base); + u.proto.clear(); + isChain = false; + this->isDirect = isDirect; + } + + void set(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, Structure* _proto, bool isDirect) + { + stubRoutine = _stubRoutine; + base.set(globalData, owner, _base); + u.proto.set(globalData, owner, _proto); + isChain = false; + this->isDirect = isDirect; + } + + void set(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, StructureChain* _chain, bool isDirect) + { + stubRoutine = _stubRoutine; + base.set(globalData, owner, _base); + u.chain.set(globalData, owner, _chain); + isChain = true; + this->isDirect = isDirect; + } + } list[POLYMORPHIC_LIST_CACHE_SIZE]; + + PolymorphicAccessStructureList(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, bool isDirect) + { + list[0].set(globalData, owner, stubRoutine, firstBase, isDirect); + } + + PolymorphicAccessStructureList(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, Structure* firstProto, bool isDirect) + { + list[0].set(globalData, owner, stubRoutine, firstBase, firstProto, isDirect); + } + + PolymorphicAccessStructureList(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, StructureChain* firstChain, bool isDirect) + { + list[0].set(globalData, 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 + + struct Instruction { + Instruction(Opcode opcode) + { +#if !ENABLE(COMPUTED_GOTO_INTERPRETER) + // We have to initialize one of the pointer members to ensure that + // the entire struct is initialized, when opcode is not a pointer. + u.jsCell.clear(); +#endif + u.opcode = opcode; + } + + Instruction(int operand) + { + // We have to initialize one of the pointer members to ensure that + // the entire struct is initialized in 64-bit. + u.jsCell.clear(); + u.operand = operand; + } + + Instruction(JSGlobalData& globalData, JSCell* owner, Structure* structure) + { + u.structure.clear(); + u.structure.set(globalData, owner, structure); + } + Instruction(JSGlobalData& globalData, JSCell* owner, StructureChain* structureChain) + { + u.structureChain.clear(); + u.structureChain.set(globalData, owner, structureChain); + } + Instruction(JSGlobalData& globalData, JSCell* owner, JSCell* jsCell) + { + u.jsCell.clear(); + u.jsCell.set(globalData, owner, jsCell); + } + + Instruction(PropertySlot::GetValueFunc getterFunc) { u.getterFunc = getterFunc; } + + union { + Opcode opcode; + int operand; + WriteBarrierBase<Structure> structure; + WriteBarrierBase<StructureChain> structureChain; + WriteBarrierBase<JSCell> jsCell; + PropertySlot::GetValueFunc getterFunc; + } u; + + private: + Instruction(StructureChain*); + Instruction(Structure*); + }; + +} // namespace JSC + +namespace WTF { + + template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { }; + +} // namespace WTF + +#endif // Instruction_h |