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 void JSStaticScopeObject::visitChildren(SlotVisitor& visitor)
  36 {
  37     ASSERT_GC_OBJECT_INHERITS(this, &s_info);
  38     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  39     ASSERT(structure()->typeInfo().overridesVisitChildren());
  40     JSVariableObject::visitChildren(visitor);
  41     visitor.append(&m_registerStore);
  42 }
  43
  44 JSObject* JSStaticScopeObject::toThisObject(ExecState* exec) const
  45 {
  46     return exec->globalThisValue();
  47 }
  48
  49 JSValue JSStaticScopeObject::toStrictThisObject(ExecState*) const
  50 {
  51     return jsNull();
  52 }
  53
  54 void JSStaticScopeObject::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
  55 {
  56     if (slot.isStrictMode()) {
  57         // Double lookup in strict mode, but this only occurs when
  58         // a) indirectly writing to an exception slot
  59         // b) writing to a function expression name
  60         // (a) is unlikely, and (b) is an error.
  61         // Also with a single entry the symbol table lookup should simply be
  62         // a pointer compare.
  63         PropertySlot slot;
  64         bool isWritable = true;
  65         symbolTableGet(propertyName, slot, isWritable);
  66         if (!isWritable) {
  67             throwError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
  68             return;
  69         }
  70     }
  71     if (symbolTablePut(exec->globalData(), propertyName, value))
  72         return;
  73
  74     ASSERT_NOT_REACHED();
  75 }
  76
  77 void JSStaticScopeObject::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes)
  78 {
  79     if (symbolTablePutWithAttributes(exec->globalData(), propertyName, value, attributes))
  80         return;
  81
  82     ASSERT_NOT_REACHED();
  83 }
  84
  85 bool JSStaticScopeObject::isDynamicScope(bool&) const
  86 {
  87     return false;
  88 }
  89
  90 bool JSStaticScopeObject::getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot& slot)
  91 {
  92     return symbolTableGet(propertyName, slot);
  93 }
  94
  95 }