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_put_by_id_transition_normal:
  53     case access_put_by_id_transition_direct:
  54     case access_put_by_id_replace:
  55     case access_unset:
  56         // These instructions don't have to release any allocated memory
  57         return;
  58     default:
  59         RELEASE_ASSERT_NOT_REACHED();
  60     }
  61 }
  62
  63 bool StructureStubInfo::visitWeakReferences(RepatchBuffer& repatchBuffer)
  64 {
  65     switch (accessType) {
  66     case access_get_by_id_self:
  67         if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
  68             return false;
  69         break;
  70     case access_get_by_id_list: {
  71         if (!u.getByIdList.list->visitWeak(repatchBuffer))
  72             return false;
  73         break;
  74     }
  75     case access_put_by_id_transition_normal:
  76     case access_put_by_id_transition_direct:
  77         if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
  78             || !Heap::isMarked(u.putByIdTransition.structure.get())
  79             || !Heap::isMarked(u.putByIdTransition.chain.get()))
  80             return false;
  81         break;
  82     case access_put_by_id_replace:
  83         if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
  84             return false;
  85         break;
  86     case access_put_by_id_list:
  87         if (!u.putByIdList.list->visitWeak(repatchBuffer))
  88             return false;
  89         break;
  90     case access_in_list: {
  91         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
  92         if (!polymorphicStructures->visitWeak(u.inList.listSize))
  93             return false;
  94         break;
  95     }
  96     default:
  97         // The rest of the instructions don't require references, so there is no need to
  98         // do anything.
  99         break;
 100     }
 101     return true;
 102 }
 103 #endif
 104
 105 } // namespace JSC