runtime/JSProxy.cpp

   1 /*
   2  * Copyright (C) 2011, 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSProxy.h"
  28
  29 #include "JSGlobalObject.h"
  30 #include "JSCInlines.h"
  31
  32 namespace JSC {
  33
  34 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSProxy);
  35
  36 const ClassInfo JSProxy::s_info = { "JSProxy", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSProxy) };
  37
  38 void JSProxy::visitChildren(JSCell* cell, SlotVisitor& visitor)
  39 {
  40     JSProxy* thisObject = jsCast<JSProxy*>(cell);
  41     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
  42
  43     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  44     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  45
  46     Base::visitChildren(thisObject, visitor);
  47     visitor.append(&thisObject->m_target);
  48 }
  49
  50 void JSProxy::setTarget(VM& vm, JSGlobalObject* globalObject)
  51 {
  52     ASSERT_ARG(globalObject, globalObject);
  53     m_target.set(vm, this, globalObject);
  54     setPrototype(vm, globalObject->prototype());
  55
  56     PrototypeMap& prototypeMap = vm.prototypeMap;
  57     if (!prototypeMap.isPrototype(this))
  58         return;
  59
  60     // This is slow but constant time. We think it's very rare for a proxy
  61     // to be a prototype, and reasonably rare to retarget a proxy,
  62     // so slow constant time is OK.
  63     for (size_t i = 0; i <= JSFinalObject::maxInlineCapacity(); ++i)
  64         prototypeMap.clearEmptyObjectStructureForPrototype(this, i);
  65 }
  66
  67 String JSProxy::className(const JSObject* object)
  68 {
  69     const JSProxy* thisObject = jsCast<const JSProxy*>(object);
  70     return thisObject->target()->methodTable()->className(thisObject->target());
  71 }
  72
  73 bool JSProxy::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
  74 {
  75     JSProxy* thisObject = jsCast<JSProxy*>(object);
  76     return thisObject->target()->methodTable(exec->vm())->getOwnPropertySlot(thisObject->target(), exec, propertyName, slot);
  77 }
  78
  79 bool JSProxy::getOwnPropertySlotByIndex(JSObject* object, ExecState* exec, unsigned propertyName, PropertySlot& slot)
  80 {
  81     JSProxy* thisObject = jsCast<JSProxy*>(object);
  82     return thisObject->target()->methodTable(exec->vm())->getOwnPropertySlotByIndex(thisObject->target(), exec, propertyName, slot);
  83 }
  84
  85 void JSProxy::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
  86 {
  87     JSProxy* thisObject = jsCast<JSProxy*>(cell);
  88     thisObject->target()->methodTable(exec->vm())->put(thisObject->target(), exec, propertyName, value, slot);
  89 }
  90
  91 void JSProxy::putByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
  92 {
  93     JSProxy* thisObject = jsCast<JSProxy*>(cell);
  94     thisObject->target()->methodTable(exec->vm())->putByIndex(thisObject->target(), exec, propertyName, value, shouldThrow);
  95 }
  96
  97 bool JSProxy::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
  98 {
  99     JSProxy* thisObject = jsCast<JSProxy*>(object);
 100     return thisObject->target()->methodTable(exec->vm())->defineOwnProperty(thisObject->target(), exec, propertyName, descriptor, shouldThrow);
 101 }
 102
 103 bool JSProxy::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
 104 {
 105     JSProxy* thisObject = jsCast<JSProxy*>(cell);
 106     return thisObject->target()->methodTable(exec->vm())->deleteProperty(thisObject->target(), exec, propertyName);
 107 }
 108
 109 bool JSProxy::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned propertyName)
 110 {
 111     JSProxy* thisObject = jsCast<JSProxy*>(cell);
 112     return thisObject->target()->methodTable(exec->vm())->deletePropertyByIndex(thisObject->target(), exec, propertyName);
 113 }
 114
 115 void JSProxy::getPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 116 {
 117     JSProxy* thisObject = jsCast<JSProxy*>(object);
 118     thisObject->target()->methodTable(exec->vm())->getPropertyNames(thisObject->target(), exec, propertyNames, mode);
 119 }
 120
 121 void JSProxy::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 122 {
 123     JSProxy* thisObject = jsCast<JSProxy*>(object);
 124     thisObject->target()->methodTable(exec->vm())->getOwnPropertyNames(thisObject->target(), exec, propertyNames, mode);
 125 }
 126
 127 } // namespace JSC