bytecode/StructureStubInfo.cpp

   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 #include "config.h"
  27 #include "StructureStubInfo.h"
  28
  29 #include "JSObject.h"
  30 #include "PolymorphicPutByIdList.h"
  31
  32
  33 namespace JSC {
  34
  35 #if ENABLE(JIT)
  36 void StructureStubInfo::deref()
  37 {
  38     switch (accessType) {
  39     case access_get_by_id_self_list: {
  40         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
  41         delete polymorphicStructures;
  42         return;
  43     }
  44     case access_get_by_id_proto_list: {
  45         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdProtoList.structureList;
  46         delete polymorphicStructures;
  47         return;
  48     }
  49     case access_put_by_id_list:
  50         delete u.putByIdList.list;
  51         return;
  52     case access_get_by_id_self:
  53     case access_get_by_id_proto:
  54     case access_get_by_id_chain:
  55     case access_put_by_id_transition_normal:
  56     case access_put_by_id_transition_direct:
  57     case access_put_by_id_replace:
  58     case access_unset:
  59     case access_get_by_id_generic:
  60     case access_put_by_id_generic:
  61     case access_get_array_length:
  62     case access_get_string_length:
  63         // These instructions don't have to release any allocated memory
  64         return;
  65     default:
  66         RELEASE_ASSERT_NOT_REACHED();
  67     }
  68 }
  69
  70 bool StructureStubInfo::visitWeakReferences()
  71 {
  72     switch (accessType) {
  73     case access_get_by_id_self:
  74         if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
  75             return false;
  76         break;
  77     case access_get_by_id_proto:
  78         if (!Heap::isMarked(u.getByIdProto.baseObjectStructure.get())
  79             || !Heap::isMarked(u.getByIdProto.prototypeStructure.get()))
  80             return false;
  81         break;
  82     case access_get_by_id_chain:
  83         if (!Heap::isMarked(u.getByIdChain.baseObjectStructure.get())
  84             || !Heap::isMarked(u.getByIdChain.chain.get()))
  85             return false;
  86         break;
  87     case access_get_by_id_self_list: {
  88         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
  89         if (!polymorphicStructures->visitWeak(u.getByIdSelfList.listSize))
  90             return false;
  91         break;
  92     }
  93     case access_get_by_id_proto_list: {
  94         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdProtoList.structureList;
  95         if (!polymorphicStructures->visitWeak(u.getByIdProtoList.listSize))
  96             return false;
  97         break;
  98     }
  99     case access_put_by_id_transition_normal:
 100     case access_put_by_id_transition_direct:
 101         if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
 102             || !Heap::isMarked(u.putByIdTransition.structure.get())
 103             || !Heap::isMarked(u.putByIdTransition.chain.get()))
 104             return false;
 105         break;
 106     case access_put_by_id_replace:
 107         if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
 108             return false;
 109         break;
 110     case access_put_by_id_list:
 111         if (!u.putByIdList.list->visitWeak())
 112             return false;
 113         break;
 114     default:
 115         // The rest of the instructions don't require references, so there is no need to
 116         // do anything.
 117         break;
 118     }
 119     return true;
 120 }
 121 #endif
 122
 123 } // namespace JSC