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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef StructureStubInfo_h
     27 #define StructureStubInfo_h
     28 
     29 #if ENABLE(JIT)
     30 
     31 #include "Instruction.h"
     32 #include "MacroAssembler.h"
     33 #include "Opcode.h"
     34 #include "Structure.h"
     35 
     36 namespace JSC {
     37 
     38     enum AccessType {
     39         access_get_by_id_self,
     40         access_get_by_id_proto,
     41         access_get_by_id_chain,
     42         access_get_by_id_self_list,
     43         access_get_by_id_proto_list,
     44         access_put_by_id_transition,
     45         access_put_by_id_replace,
     46         access_get_by_id,
     47         access_put_by_id,
     48         access_get_by_id_generic,
     49         access_put_by_id_generic,
     50         access_get_array_length,
     51         access_get_string_length,
     52     };
     53 
     54     struct StructureStubInfo {
     55         StructureStubInfo(AccessType accessType)
     56             : accessType(accessType)
     57             , seen(false)
     58         {
     59         }
     60 
     61         void initGetByIdSelf(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure)
     62         {
     63             accessType = access_get_by_id_self;
     64 
     65             u.getByIdSelf.baseObjectStructure.set(globalData, owner, baseObjectStructure);
     66         }
     67 
     68         void initGetByIdProto(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure, Structure* prototypeStructure)
     69         {
     70             accessType = access_get_by_id_proto;
     71 
     72             u.getByIdProto.baseObjectStructure.set(globalData, owner, baseObjectStructure);
     73             u.getByIdProto.prototypeStructure.set(globalData, owner, prototypeStructure);
     74         }
     75 
     76         void initGetByIdChain(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure, StructureChain* chain)
     77         {
     78             accessType = access_get_by_id_chain;
     79 
     80             u.getByIdChain.baseObjectStructure.set(globalData, owner, baseObjectStructure);
     81             u.getByIdChain.chain.set(globalData, owner, chain);
     82         }
     83 
     84         void initGetByIdSelfList(PolymorphicAccessStructureList* structureList, int listSize)
     85         {
     86             accessType = access_get_by_id_self_list;
     87 
     88             u.getByIdProtoList.structureList = structureList;
     89             u.getByIdProtoList.listSize = listSize;
     90         }
     91 
     92         void initGetByIdProtoList(PolymorphicAccessStructureList* structureList, int listSize)
     93         {
     94             accessType = access_get_by_id_proto_list;
     95 
     96             u.getByIdProtoList.structureList = structureList;
     97             u.getByIdProtoList.listSize = listSize;
     98         }
     99 
    100         // PutById*
    101 
    102         void initPutByIdTransition(JSGlobalData& globalData, JSCell* owner, Structure* previousStructure, Structure* structure, StructureChain* chain)
    103         {
    104             accessType = access_put_by_id_transition;
    105 
    106             u.putByIdTransition.previousStructure.set(globalData, owner, previousStructure);
    107             u.putByIdTransition.structure.set(globalData, owner, structure);
    108             u.putByIdTransition.chain.set(globalData, owner, chain);
    109         }
    110 
    111         void initPutByIdReplace(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure)
    112         {
    113             accessType = access_put_by_id_replace;
    114 
    115             u.putByIdReplace.baseObjectStructure.set(globalData, owner, baseObjectStructure);
    116         }
    117 
    118         void deref();
    119         void markAggregate(MarkStack&);
    120 
    121         bool seenOnce()
    122         {
    123             return seen;
    124         }
    125 
    126         void setSeen()
    127         {
    128             seen = true;
    129         }
    130 
    131         int accessType : 31;
    132         int seen : 1;
    133 
    134         union {
    135             struct {
    136                 WriteBarrierBase<Structure> baseObjectStructure;
    137             } getByIdSelf;
    138             struct {
    139                 WriteBarrierBase<Structure> baseObjectStructure;
    140                 WriteBarrierBase<Structure> prototypeStructure;
    141             } getByIdProto;
    142             struct {
    143                 WriteBarrierBase<Structure> baseObjectStructure;
    144                 WriteBarrierBase<StructureChain> chain;
    145             } getByIdChain;
    146             struct {
    147                 PolymorphicAccessStructureList* structureList;
    148                 int listSize;
    149             } getByIdSelfList;
    150             struct {
    151                 PolymorphicAccessStructureList* structureList;
    152                 int listSize;
    153             } getByIdProtoList;
    154             struct {
    155                 WriteBarrierBase<Structure> previousStructure;
    156                 WriteBarrierBase<Structure> structure;
    157                 WriteBarrierBase<StructureChain> chain;
    158             } putByIdTransition;
    159             struct {
    160                 WriteBarrierBase<Structure> baseObjectStructure;
    161             } putByIdReplace;
    162         } u;
    163 
    164         CodeLocationLabel stubRoutine;
    165         CodeLocationCall callReturnLocation;
    166         CodeLocationLabel hotPathBegin;
    167     };
    168 
    169 } // namespace JSC
    170 
    171 #endif
    172 
    173 #endif // StructureStubInfo_h
    174