bytecode/StructureStubInfo.cpp

   1 /*
   2  * Copyright (C) 2008, 2014 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 "PolymorphicGetByIdList.h"
  31 #include "PolymorphicPutByIdList.h"
  32
  33 namespace JSC {
  34
  35 #if ENABLE(JIT)
  36 void StructureStubInfo::deref()
  37 {
  38     switch (accessType) {
  39     case access_get_by_id_list: {
  40         delete u.getByIdList.list;
  41         return;
  42     }
  43     case access_put_by_id_list:
  44         delete u.putByIdList.list;
  45         return;
  46     case access_in_list: {
  47         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
  48         delete polymorphicStructures;
  49         return;
  50     }
  51     case access_get_by_id_self:
  52     case access_get_by_id_chain:
  53     case access_put_by_id_transition_normal:
  54     case access_put_by_id_transition_direct:
  55     case access_put_by_id_replace:
  56     case access_unset:
  57         // These instructions don't have to release any allocated memory
  58         return;
  59     default:
  60         RELEASE_ASSERT_NOT_REACHED();
  61     }
  62 }
  63
  64 bool StructureStubInfo::visitWeakReferences(RepatchBuffer& repatchBuffer)
  65 {
  66     switch (accessType) {
  67     case access_get_by_id_self:
  68         if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
  69             return false;
  70         break;
  71     case access_get_by_id_chain:
  72         if (!Heap::isMarked(u.getByIdChain.baseObjectStructure.get())
  73             || !Heap::isMarked(u.getByIdChain.chain.get()))
  74             return false;
  75         break;
  76     case access_get_by_id_list: {
  77         if (!u.getByIdList.list->visitWeak(repatchBuffer))
  78             return false;
  79         break;
  80     }
  81     case access_put_by_id_transition_normal:
  82     case access_put_by_id_transition_direct:
  83         if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
  84             || !Heap::isMarked(u.putByIdTransition.structure.get())
  85             || !Heap::isMarked(u.putByIdTransition.chain.get()))
  86             return false;
  87         break;
  88     case access_put_by_id_replace:
  89         if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
  90             return false;
  91         break;
  92     case access_put_by_id_list:
  93         if (!u.putByIdList.list->visitWeak(repatchBuffer))
  94             return false;
  95         break;
  96     case access_in_list: {
  97         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
  98         if (!polymorphicStructures->visitWeak(u.inList.listSize))
  99             return false;
 100         break;
 101     }
 102     default:
 103         // The rest of the instructions don't require references, so there is no need to
 104         // do anything.
 105         break;
 106     }
 107     return true;
 108 }
 109 #endif
 110
 111 } // namespace JSC