diff options
Diffstat (limited to 'Source/JavaScriptCore/bytecode/Instruction.h')
| -rw-r--r-- | Source/JavaScriptCore/bytecode/Instruction.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/bytecode/Instruction.h b/Source/JavaScriptCore/bytecode/Instruction.h new file mode 100644 index 0000000..c6468a5 --- /dev/null +++ b/Source/JavaScriptCore/bytecode/Instruction.h @@ -0,0 +1,169 @@ +/* + * 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 <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. +#if ENABLE(JIT) + typedef CodeLocationLabel PolymorphicAccessStructureListStubRoutineType; +#else + typedef void* PolymorphicAccessStructureListStubRoutineType; +#endif + + 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 : FastAllocBase { + struct PolymorphicStubInfo { + bool isChain; + PolymorphicAccessStructureListStubRoutineType stubRoutine; + Structure* base; + union { + Structure* proto; + StructureChain* chain; + } u; + + void set(PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base) + { + stubRoutine = _stubRoutine; + base = _base; + u.proto = 0; + isChain = false; + } + + void set(PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, Structure* _proto) + { + stubRoutine = _stubRoutine; + base = _base; + u.proto = _proto; + isChain = false; + } + + void set(PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, StructureChain* _chain) + { + stubRoutine = _stubRoutine; + base = _base; + u.chain = _chain; + isChain = true; + } + } list[POLYMORPHIC_LIST_CACHE_SIZE]; + + PolymorphicAccessStructureList(PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase) + { + list[0].set(stubRoutine, firstBase); + } + + PolymorphicAccessStructureList(PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, Structure* firstProto) + { + list[0].set(stubRoutine, firstBase, firstProto); + } + + PolymorphicAccessStructureList(PolymorphicAccessStructureListStubRoutineType 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) + { +#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 = 0; +#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 = 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; } + Instruction(PropertySlot::GetValueFunc getterFunc) { u.getterFunc = getterFunc; } + + union { + Opcode opcode; + int operand; + Structure* structure; + StructureChain* structureChain; + JSCell* jsCell; + PolymorphicAccessStructureList* polymorphicStructures; + PropertySlot::GetValueFunc getterFunc; + } u; + }; + +} // namespace JSC + +namespace WTF { + + template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { }; + +} // namespace WTF + +#endif // Instruction_h |