runtime/JSStaticScopeObject.cpp

   1 /*
   2  * Copyright (C) 2008, 2009 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
  28 #include "JSStaticScopeObject.h"
  29
  30 #include "Error.h"
  31
  32 namespace JSC {
  33 ASSERT_CLASS_FITS_IN_CELL(JSStaticScopeObject);
  34
  35 const ClassInfo JSStaticScopeObject::s_info = { "Object", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSStaticScopeObject) };
  36
  37 void JSStaticScopeObject::destroy(JSCell* cell)
  38 {
  39     jsCast<JSStaticScopeObject*>(cell)->JSStaticScopeObject::~JSStaticScopeObject();
  40 }
  41
  42 void JSStaticScopeObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
  43 {
  44     JSStaticScopeObject* thisObject = jsCast<JSStaticScopeObject*>(cell);
  45     ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
  46     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  47     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  48     JSVariableObject::visitChildren(thisObject, visitor);
  49     visitor.append(&thisObject->m_registerStore);
  50 }
  51
  52 JSObject* JSStaticScopeObject::toThisObject(JSCell*, ExecState* exec)
  53 {
  54     return exec->globalThisValue();
  55 }
  56
  57 void JSStaticScopeObject::put(JSCell* cell, ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
  58 {
  59     JSStaticScopeObject* thisObject = jsCast<JSStaticScopeObject*>(cell);
  60     if (slot.isStrictMode()) {
  61         // Double lookup in strict mode, but this only occurs when
  62         // a) indirectly writing to an exception slot
  63         // b) writing to a function expression name
  64         // (a) is unlikely, and (b) is an error.
  65         // Also with a single entry the symbol table lookup should simply be
  66         // a pointer compare.
  67         PropertySlot slot;
  68         bool isWritable = true;
  69         thisObject->symbolTableGet(propertyName, slot, isWritable);
  70         if (!isWritable) {
  71             throwError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
  72             return;
  73         }
  74     }
  75     if (thisObject->symbolTablePut(exec, propertyName, value, slot.isStrictMode()))
  76         return;
  77
  78     ASSERT_NOT_REACHED();
  79 }
  80
  81 void JSStaticScopeObject::putDirectVirtual(JSObject* object, ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes)
  82 {
  83     JSStaticScopeObject* thisObject = jsCast<JSStaticScopeObject*>(object);
  84     if (thisObject->symbolTablePutWithAttributes(exec->globalData(), propertyName, value, attributes))
  85         return;
  86
  87     ASSERT_NOT_REACHED();
  88 }
  89
  90 bool JSStaticScopeObject::getOwnPropertySlot(JSCell* cell, ExecState*, const Identifier& propertyName, PropertySlot& slot)
  91 {
  92     return jsCast<JSStaticScopeObject*>(cell)->symbolTableGet(propertyName, slot);
  93 }
  94
  95 }