runtime/GenericArguments.h

   1 /*
   2  * Copyright (C) 2015 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 GenericArguments_h
  27 #define GenericArguments_h
  28
  29 #include "JSObject.h"
  30
  31 namespace JSC {
  32
  33 // This is a mixin for the two kinds of Arguments-class objects that arise when you say
  34 // "arguments" inside a function. This class doesn't show up in the JSCell inheritance hierarchy.
  35 template<typename Type>
  36 class GenericArguments : public JSNonFinalObject {
  37 public:
  38     typedef JSNonFinalObject Base;
  39     static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | OverridesGetPropertyNames;
  40
  41 protected:
  42     GenericArguments(VM& vm, Structure* structure)
  43         : Base(vm, structure)
  44     {
  45     }
  46
  47     static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
  48     static bool getOwnPropertySlotByIndex(JSObject*, ExecState*, unsigned propertyName, PropertySlot&);
  49     static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
  50     static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
  51     static void putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
  52     static bool deleteProperty(JSCell*, ExecState*, PropertyName);
  53     static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
  54     static bool defineOwnProperty(JSObject*, ExecState*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
  55
  56     void copyToArguments(ExecState*, VirtualRegister firstElementDest, unsigned offset, unsigned length);
  57 };
  58
  59 } // namespace JSC
  60
  61 #endif // GenericArguments_h
  62