runtime/JSWrapperObject.h

   1 /*
   2  *  Copyright (C) 2006 Maks Orlovich
   3  *  Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Library General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Library General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Library General Public License
  16  *  along with this library; see the file COPYING.LIB.  If not, write to
  17  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  *  Boston, MA 02110-1301, USA.
  19  *
  20  */
  21
  22 #ifndef JSWrapperObject_h
  23 #define JSWrapperObject_h
  24
  25 #include "JSDestructibleObject.h"
  26
  27 namespace JSC {
  28
  29 // This class is used as a base for classes such as String,
  30 // Number, Boolean and Date which are wrappers for primitive types.
  31 class JSWrapperObject : public JSDestructibleObject {
  32 public:
  33     typedef JSDestructibleObject Base;
  34
  35     static size_t allocationSize(size_t inlineCapacity)
  36     {
  37         ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
  38         return sizeof(JSWrapperObject);
  39     }
  40
  41     JSValue internalValue() const;
  42     void setInternalValue(VM&, JSValue);
  43
  44     static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
  45     {
  46         return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
  47     }
  48
  49     static ptrdiff_t internalValueOffset() { return OBJECT_OFFSETOF(JSWrapperObject, m_internalValue); }
  50     static ptrdiff_t internalValueCellOffset()
  51     {
  52 #if USE(JSVALUE64)
  53         return internalValueOffset();
  54 #else
  55         return internalValueOffset() + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload);
  56 #endif
  57     }
  58
  59 protected:
  60     explicit JSWrapperObject(VM&, Structure*);
  61
  62     JS_EXPORT_PRIVATE static void visitChildren(JSCell*, SlotVisitor&);
  63
  64 private:
  65     WriteBarrier<Unknown> m_internalValue;
  66 };
  67
  68 inline JSWrapperObject::JSWrapperObject(VM& vm, Structure* structure)
  69     : JSDestructibleObject(vm, structure)
  70 {
  71 }
  72
  73 inline JSValue JSWrapperObject::internalValue() const
  74 {
  75     return m_internalValue.get();
  76 }
  77
  78 inline void JSWrapperObject::setInternalValue(VM& vm, JSValue value)
  79 {
  80     ASSERT(value);
  81     ASSERT(!value.isObject());
  82     m_internalValue.set(vm, this, value);
  83 }
  84
  85 } // namespace JSC
  86
  87 #endif // JSWrapperObject_h