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, 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     Base::visitChildren(thisObject, visitor);
  43     visitor.append(&thisObject->m_target);
  44 }
  45
  46 void JSProxy::setTarget(VM& vm, JSGlobalObject* globalObject)
  47 {
  48     ASSERT_ARG(globalObject, globalObject);
  49     m_target.set(vm, this, globalObject);
  50     setPrototype(vm, globalObject->prototype());
  51
  52     PrototypeMap& prototypeMap = vm.prototypeMap;
  53     if (!prototypeMap.isPrototype(this))
  54         return;
  55
  56     // This is slow but constant time. We think it's very rare for a proxy
  57     // to be a prototype, and reasonably rare to retarget a proxy,
  58     // so slow constant time is OK.
  59     for (size_t i = 0; i <= JSFinalObject::maxInlineCapacity(); ++i)
  60         prototypeMap.clearEmptyObjectStructureForPrototype(this, i);
  61 }
  62
  63 String JSProxy::className(const JSObject* object)
  64 {
  65     const JSProxy* thisObject = jsCast<const JSProxy*>(object);
  66     return thisObject->target()->methodTable()->className(thisObject->target());
  67 }
  68
  69 bool JSProxy::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
  70 {
  71     JSProxy* thisObject = jsCast<JSProxy*>(object);
  72     return thisObject->target()->methodTable(exec->vm())->getOwnPropertySlot(thisObject->target(), exec, propertyName, slot);
  73 }
  74
  75 bool JSProxy::getOwnPropertySlotByIndex(JSObject* object, ExecState* exec, unsigned propertyName, PropertySlot& slot)
  76 {
  77     JSProxy* thisObject = jsCast<JSProxy*>(object);
  78     return thisObject->target()->methodTable(exec->vm())->getOwnPropertySlotByIndex(thisObject->target(), exec, propertyName, slot);
  79 }
  80
  81 void JSProxy::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
  82 {
  83     JSProxy* thisObject = jsCast<JSProxy*>(cell);
  84     thisObject->target()->methodTable(exec->vm())->put(thisObject->target(), exec, propertyName, value, slot);
  85 }
  86
  87 void JSProxy::putByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
  88 {
  89     JSProxy* thisObject = jsCast<JSProxy*>(cell);
  90     thisObject->target()->methodTable(exec->vm())->putByIndex(thisObject->target(), exec, propertyName, value, shouldThrow);
  91 }
  92
  93 bool JSProxy::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
  94 {
  95     JSProxy* thisObject = jsCast<JSProxy*>(object);
  96     return thisObject->target()->methodTable(exec->vm())->defineOwnProperty(thisObject->target(), exec, propertyName, descriptor, shouldThrow);
  97 }
  98
  99 bool JSProxy::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
 100 {
 101     JSProxy* thisObject = jsCast<JSProxy*>(cell);
 102     return thisObject->target()->methodTable(exec->vm())->deleteProperty(thisObject->target(), exec, propertyName);
 103 }
 104
 105 bool JSProxy::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned propertyName)
 106 {
 107     JSProxy* thisObject = jsCast<JSProxy*>(cell);
 108     return thisObject->target()->methodTable(exec->vm())->deletePropertyByIndex(thisObject->target(), exec, propertyName);
 109 }
 110
 111 void JSProxy::getPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 112 {
 113     JSProxy* thisObject = jsCast<JSProxy*>(object);
 114     thisObject->target()->methodTable(exec->vm())->getPropertyNames(thisObject->target(), exec, propertyNames, mode);
 115 }
 116
 117 uint32_t JSProxy::getEnumerableLength(ExecState* exec, JSObject* object)
 118 {
 119     JSProxy* thisObject = jsCast<JSProxy*>(object);
 120     return thisObject->target()->methodTable(exec->vm())->getEnumerableLength(exec, thisObject->target());
 121 }
 122
 123 void JSProxy::getStructurePropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode)
 124 {
 125     // Skip the structure loop, since it is invalid for proxies.
 126 }
 127
 128 void JSProxy::getGenericPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 129 {
 130     JSProxy* thisObject = jsCast<JSProxy*>(object);
 131     // Get *all* of the property names, not just the generic ones, since we skipped the structure
 132     // ones above.
 133     thisObject->target()->methodTable(exec->vm())->getPropertyNames(thisObject->target(), exec, propertyNames, mode);
 134 }
 135
 136 void JSProxy::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 137 {
 138     JSProxy* thisObject = jsCast<JSProxy*>(object);
 139     thisObject->target()->methodTable(exec->vm())->getOwnPropertyNames(thisObject->target(), exec, propertyNames, mode);
 140 }
 141
 142 } // namespace JSC