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 #include <wtf/Platform.h>
  30
  31 #if ENABLE(JIT)
  32
  33 #include "CodeOrigin.h"
  34 #include "Instruction.h"
  35 #include "MacroAssembler.h"
  36 #include "Opcode.h"
  37 #include "Structure.h"
  38
  39 namespace JSC {
  40
  41     class PolymorphicPutByIdList;
  42
  43     enum AccessType {
  44         access_get_by_id_self,
  45         access_get_by_id_proto,
  46         access_get_by_id_chain,
  47         access_get_by_id_self_list,
  48         access_get_by_id_proto_list,
  49         access_put_by_id_transition_normal,
  50         access_put_by_id_transition_direct,
  51         access_put_by_id_replace,
  52         access_put_by_id_list,
  53         access_unset,
  54         access_get_by_id_generic,
  55         access_put_by_id_generic,
  56         access_get_array_length,
  57         access_get_string_length,
  58     };
  59
  60     inline bool isGetByIdAccess(AccessType accessType)
  61     {
  62         switch (accessType) {
  63         case access_get_by_id_self:
  64         case access_get_by_id_proto:
  65         case access_get_by_id_chain:
  66         case access_get_by_id_self_list:
  67         case access_get_by_id_proto_list:
  68         case access_get_by_id_generic:
  69         case access_get_array_length:
  70         case access_get_string_length:
  71             return true;
  72         default:
  73             return false;
  74         }
  75     }
  76
  77     inline bool isPutByIdAccess(AccessType accessType)
  78     {
  79         switch (accessType) {
  80         case access_put_by_id_transition_normal:
  81         case access_put_by_id_transition_direct:
  82         case access_put_by_id_replace:
  83         case access_put_by_id_list:
  84         case access_put_by_id_generic:
  85             return true;
  86         default:
  87             return false;
  88         }
  89     }
  90
  91     struct StructureStubInfo {
  92         StructureStubInfo()
  93             : accessType(access_unset)
  94             , seen(false)
  95         {
  96         }
  97
  98         void initGetByIdSelf(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure)
  99         {
 100             accessType = access_get_by_id_self;
 101
 102             u.getByIdSelf.baseObjectStructure.set(globalData, owner, baseObjectStructure);
 103         }
 104
 105         void initGetByIdProto(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure, Structure* prototypeStructure)
 106         {
 107             accessType = access_get_by_id_proto;
 108
 109             u.getByIdProto.baseObjectStructure.set(globalData, owner, baseObjectStructure);
 110             u.getByIdProto.prototypeStructure.set(globalData, owner, prototypeStructure);
 111         }
 112
 113         void initGetByIdChain(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure, StructureChain* chain)
 114         {
 115             accessType = access_get_by_id_chain;
 116
 117             u.getByIdChain.baseObjectStructure.set(globalData, owner, baseObjectStructure);
 118             u.getByIdChain.chain.set(globalData, owner, chain);
 119         }
 120
 121         void initGetByIdSelfList(PolymorphicAccessStructureList* structureList, int listSize)
 122         {
 123             accessType = access_get_by_id_self_list;
 124
 125             u.getByIdSelfList.structureList = structureList;
 126             u.getByIdSelfList.listSize = listSize;
 127         }
 128
 129         void initGetByIdProtoList(PolymorphicAccessStructureList* structureList, int listSize)
 130         {
 131             accessType = access_get_by_id_proto_list;
 132
 133             u.getByIdProtoList.structureList = structureList;
 134             u.getByIdProtoList.listSize = listSize;
 135         }
 136
 137         // PutById*
 138
 139         void initPutByIdTransition(JSGlobalData& globalData, JSCell* owner, Structure* previousStructure, Structure* structure, StructureChain* chain, bool isDirect)
 140         {
 141             if (isDirect)
 142                 accessType = access_put_by_id_transition_direct;
 143             else
 144                 accessType = access_put_by_id_transition_normal;
 145
 146             u.putByIdTransition.previousStructure.set(globalData, owner, previousStructure);
 147             u.putByIdTransition.structure.set(globalData, owner, structure);
 148             u.putByIdTransition.chain.set(globalData, owner, chain);
 149         }
 150
 151         void initPutByIdReplace(JSGlobalData& globalData, JSCell* owner, Structure* baseObjectStructure)
 152         {
 153             accessType = access_put_by_id_replace;
 154
 155             u.putByIdReplace.baseObjectStructure.set(globalData, owner, baseObjectStructure);
 156         }
 157
 158         void initPutByIdList(PolymorphicPutByIdList* list)
 159         {
 160             accessType = access_put_by_id_list;
 161             u.putByIdList.list = list;
 162         }
 163
 164         void reset()
 165         {
 166             deref();
 167             accessType = access_unset;
 168             stubRoutine = MacroAssemblerCodeRef();
 169         }
 170
 171         void deref();
 172
 173         bool visitWeakReferences();
 174
 175         bool seenOnce()
 176         {
 177             return seen;
 178         }
 179
 180         void setSeen()
 181         {
 182             seen = true;
 183         }
 184
 185         unsigned bytecodeIndex;
 186
 187         int8_t accessType;
 188         int8_t seen;
 189
 190 #if ENABLE(DFG_JIT)
 191         CodeOrigin codeOrigin;
 192 #endif // ENABLE(DFG_JIT)
 193
 194         union {
 195             struct {
 196                 int8_t registersFlushed;
 197                 int8_t baseGPR;
 198 #if USE(JSVALUE32_64)
 199                 int8_t valueTagGPR;
 200 #endif
 201                 int8_t valueGPR;
 202                 int8_t scratchGPR;
 203                 int16_t deltaCallToDone;
 204                 int16_t deltaCallToStructCheck;
 205                 int16_t deltaCallToSlowCase;
 206                 int16_t deltaCheckImmToCall;
 207 #if USE(JSVALUE64)
 208                 int16_t deltaCallToLoadOrStore;
 209 #else
 210                 int16_t deltaCallToTagLoadOrStore;
 211                 int16_t deltaCallToPayloadLoadOrStore;
 212 #endif
 213             } dfg;
 214             struct {
 215                 union {
 216                     struct {
 217                         int16_t structureToCompare;
 218                         int16_t structureCheck;
 219 #if USE(JSVALUE64)
 220                         int16_t displacementLabel;
 221 #else
 222                         int16_t displacementLabel1;
 223                         int16_t displacementLabel2;
 224 #endif
 225                         int16_t putResult;
 226                         int16_t coldPathBegin;
 227                     } get;
 228                     struct {
 229                         int16_t structureToCompare;
 230 #if USE(JSVALUE64)
 231                         int16_t displacementLabel;
 232 #else
 233                         int16_t displacementLabel1;
 234                         int16_t displacementLabel2;
 235 #endif
 236                     } put;
 237                 } u;
 238                 int16_t methodCheckProtoObj;
 239                 int16_t methodCheckProtoStructureToCompare;
 240                 int16_t methodCheckPutFunction;
 241             } baseline;
 242         } patch;
 243
 244         union {
 245             struct {
 246                 // It would be unwise to put anything here, as it will surely be overwritten.
 247             } unset;
 248             struct {
 249                 WriteBarrierBase<Structure> baseObjectStructure;
 250             } getByIdSelf;
 251             struct {
 252                 WriteBarrierBase<Structure> baseObjectStructure;
 253                 WriteBarrierBase<Structure> prototypeStructure;
 254             } getByIdProto;
 255             struct {
 256                 WriteBarrierBase<Structure> baseObjectStructure;
 257                 WriteBarrierBase<StructureChain> chain;
 258             } getByIdChain;
 259             struct {
 260                 PolymorphicAccessStructureList* structureList;
 261                 int listSize;
 262             } getByIdSelfList;
 263             struct {
 264                 PolymorphicAccessStructureList* structureList;
 265                 int listSize;
 266             } getByIdProtoList;
 267             struct {
 268                 WriteBarrierBase<Structure> previousStructure;
 269                 WriteBarrierBase<Structure> structure;
 270                 WriteBarrierBase<StructureChain> chain;
 271             } putByIdTransition;
 272             struct {
 273                 WriteBarrierBase<Structure> baseObjectStructure;
 274             } putByIdReplace;
 275             struct {
 276                 PolymorphicPutByIdList* list;
 277             } putByIdList;
 278         } u;
 279
 280         MacroAssemblerCodeRef stubRoutine;
 281         CodeLocationCall callReturnLocation;
 282         CodeLocationLabel hotPathBegin;
 283     };
 284
 285     inline void* getStructureStubInfoReturnLocation(StructureStubInfo* structureStubInfo)
 286     {
 287         return structureStubInfo->callReturnLocation.executableAddress();
 288     }
 289
 290     inline unsigned getStructureStubInfoBytecodeIndex(StructureStubInfo* structureStubInfo)
 291     {
 292         return structureStubInfo->bytecodeIndex;
 293     }
 294
 295 } // namespace JSC
 296
 297 #endif // ENABLE(JIT)
 298
 299 #endif // StructureStubInfo_h