runtime/JSWithScope.h

   1 /*
   2  * Copyright (C) 2012 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 JSWithScope_h
  27 #define JSWithScope_h
  28
  29 #include "JSGlobalObject.h"
  30
  31 namespace JSC {
  32
  33 class JSWithScope : public JSScope {
  34 public:
  35     typedef JSScope Base;
  36
  37     static JSWithScope* create(ExecState* exec, JSObject* object)
  38     {
  39         JSWithScope* withScope = new (NotNull, allocateCell<JSWithScope>(*exec->heap())) JSWithScope(exec, object);
  40         withScope->finishCreation(exec->vm());
  41         return withScope;
  42     }
  43
  44     static JSWithScope* create(ExecState* exec, JSObject* object, JSScope* next)
  45     {
  46         JSWithScope* withScope = new (NotNull, allocateCell<JSWithScope>(*exec->heap())) JSWithScope(exec, object, next);
  47         withScope->finishCreation(exec->vm());
  48         return withScope;
  49     }
  50
  51     JSObject* object() { return m_object.get(); }
  52
  53     static void visitChildren(JSCell*, SlotVisitor&);
  54
  55     static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto)
  56     {
  57         return Structure::create(vm, globalObject, proto, TypeInfo(WithScopeType, StructureFlags), info());
  58     }
  59
  60     DECLARE_EXPORT_INFO;
  61
  62 protected:
  63     static const unsigned StructureFlags = OverridesVisitChildren | Base::StructureFlags;
  64
  65 private:
  66     JSWithScope(ExecState* exec, JSObject* object)
  67         : Base(
  68             exec->vm(),
  69             exec->lexicalGlobalObject()->withScopeStructure(),
  70             exec->scope()
  71         )
  72         , m_object(exec->vm(), this, object)
  73     {
  74     }
  75
  76     JSWithScope(ExecState* exec, JSObject* object, JSScope* next)
  77         : Base(
  78             exec->vm(),
  79             exec->lexicalGlobalObject()->withScopeStructure(),
  80             next
  81         )
  82         , m_object(exec->vm(), this, object)
  83     {
  84     }
  85
  86     WriteBarrier<JSObject> m_object;
  87 };
  88
  89 } // namespace JSC
  90
  91 #endif // JSWithScope_h