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Diffstat (limited to 'Source/JavaScriptCore/bytecode/StructureStubInfo.h')
| -rw-r--r-- | Source/JavaScriptCore/bytecode/StructureStubInfo.h | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/bytecode/StructureStubInfo.h b/Source/JavaScriptCore/bytecode/StructureStubInfo.h new file mode 100644 index 000000000..e6c1ceed9 --- /dev/null +++ b/Source/JavaScriptCore/bytecode/StructureStubInfo.h @@ -0,0 +1,261 @@ +/* + * Copyright (C) 2008, 2012-2015 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 StructureStubInfo_h +#define StructureStubInfo_h + +#include "CodeOrigin.h" +#include "Instruction.h" +#include "JITStubRoutine.h" +#include "MacroAssembler.h" +#include "ObjectPropertyConditionSet.h" +#include "Opcode.h" +#include "PolymorphicAccessStructureList.h" +#include "RegisterSet.h" +#include "SpillRegistersMode.h" +#include "Structure.h" +#include "StructureStubClearingWatchpoint.h" + +namespace JSC { + +#if ENABLE(JIT) + +class PolymorphicGetByIdList; +class PolymorphicPutByIdList; + +enum AccessType { + access_get_by_id_self, + access_get_by_id_list, + access_put_by_id_transition_normal, + access_put_by_id_transition_direct, + access_put_by_id_replace, + access_put_by_id_list, + access_unset, + access_in_list +}; + +inline bool isGetByIdAccess(AccessType accessType) +{ + switch (accessType) { + case access_get_by_id_self: + case access_get_by_id_list: + return true; + default: + return false; + } +} + +inline bool isPutByIdAccess(AccessType accessType) +{ + switch (accessType) { + case access_put_by_id_transition_normal: + case access_put_by_id_transition_direct: + case access_put_by_id_replace: + case access_put_by_id_list: + return true; + default: + return false; + } +} + +inline bool isInAccess(AccessType accessType) +{ + switch (accessType) { + case access_in_list: + return true; + default: + return false; + } +} + +struct StructureStubInfo { + StructureStubInfo() + : accessType(access_unset) + , seen(false) + , resetByGC(false) + , tookSlowPath(false) + { + } + + void initGetByIdSelf(VM& vm, JSCell* owner, Structure* baseObjectStructure) + { + accessType = access_get_by_id_self; + + u.getByIdSelf.baseObjectStructure.set(vm, owner, baseObjectStructure); + } + + void initGetByIdList(PolymorphicGetByIdList* list) + { + accessType = access_get_by_id_list; + u.getByIdList.list = list; + } + + // PutById* + + void initPutByIdTransition(VM& vm, JSCell* owner, Structure* previousStructure, Structure* structure, ObjectPropertyConditionSet conditionSet, bool isDirect) + { + if (isDirect) + accessType = access_put_by_id_transition_direct; + else + accessType = access_put_by_id_transition_normal; + + u.putByIdTransition.previousStructure.set(vm, owner, previousStructure); + u.putByIdTransition.structure.set(vm, owner, structure); + u.putByIdTransition.rawConditionSet = conditionSet.releaseRawPointer(); + } + + void initPutByIdReplace(VM& vm, JSCell* owner, Structure* baseObjectStructure) + { + accessType = access_put_by_id_replace; + + u.putByIdReplace.baseObjectStructure.set(vm, owner, baseObjectStructure); + } + + void initPutByIdList(PolymorphicPutByIdList* list) + { + accessType = access_put_by_id_list; + u.putByIdList.list = list; + } + + void initInList(PolymorphicAccessStructureList* list, int listSize) + { + accessType = access_in_list; + u.inList.structureList = list; + u.inList.listSize = listSize; + } + + void reset() + { + deref(); + accessType = access_unset; + stubRoutine = nullptr; + watchpoints = nullptr; + } + + void deref(); + + // Check if the stub has weak references that are dead. If there are dead ones that imply + // that the stub should be entirely reset, this should return false. If there are dead ones + // that can be handled internally by the stub and don't require a full reset, then this + // should reset them and return true. If there are no dead weak references, return true. + // If this method returns true it means that it has left the stub in a state where all + // outgoing GC pointers are known to point to currently marked objects; this method is + // allowed to accomplish this by either clearing those pointers somehow or by proving that + // they have already been marked. It is not allowed to mark new objects. + bool visitWeakReferences(RepatchBuffer&); + + bool seenOnce() + { + return seen; + } + + void setSeen() + { + seen = true; + } + + StructureStubClearingWatchpoint* addWatchpoint( + CodeBlock* codeBlock, const ObjectPropertyCondition& condition = ObjectPropertyCondition()) + { + return WatchpointsOnStructureStubInfo::ensureReferenceAndAddWatchpoint( + watchpoints, codeBlock, this, condition); + } + + int8_t accessType; + bool seen : 1; + bool resetByGC : 1; + bool tookSlowPath : 1; + + CodeOrigin codeOrigin; + + struct { + unsigned spillMode : 8; + int8_t baseGPR; +#if USE(JSVALUE32_64) + int8_t valueTagGPR; +#endif + int8_t valueGPR; + RegisterSet usedRegisters; + int32_t deltaCallToDone; + int32_t deltaCallToStorageLoad; + int32_t deltaCallToJump; + int32_t deltaCallToSlowCase; + int32_t deltaCheckImmToCall; +#if USE(JSVALUE64) + int32_t deltaCallToLoadOrStore; +#else + int32_t deltaCallToTagLoadOrStore; + int32_t deltaCallToPayloadLoadOrStore; +#endif + } patch; + + union { + struct { + // It would be unwise to put anything here, as it will surely be overwritten. + } unset; + struct { + WriteBarrierBase<Structure> baseObjectStructure; + } getByIdSelf; + struct { + PolymorphicGetByIdList* list; + } getByIdList; + struct { + WriteBarrierBase<Structure> previousStructure; + WriteBarrierBase<Structure> structure; + void* rawConditionSet; + } putByIdTransition; + struct { + WriteBarrierBase<Structure> baseObjectStructure; + } putByIdReplace; + struct { + PolymorphicPutByIdList* list; + } putByIdList; + struct { + PolymorphicAccessStructureList* structureList; + int listSize; + } inList; + } u; + + RefPtr<JITStubRoutine> stubRoutine; + CodeLocationCall callReturnLocation; + RefPtr<WatchpointsOnStructureStubInfo> watchpoints; +}; + +inline CodeOrigin getStructureStubInfoCodeOrigin(StructureStubInfo& structureStubInfo) +{ + return structureStubInfo.codeOrigin; +} + +typedef HashMap<CodeOrigin, StructureStubInfo*, CodeOriginApproximateHash> StubInfoMap; + +#else + +typedef HashMap<int, void*> StubInfoMap; + +#endif // ENABLE(JIT) + +} // namespace JSC + +#endif // StructureStubInfo_h |