bytecode/StructureStubInfo.h

   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 visitAggregate(SlotVisitor&);
 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