src/elements.h

// Copyright 2011 the V8 project authors. All rights reserved.
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#ifndef V8_ELEMENTS_H_
#define V8_ELEMENTS_H_

#include "objects.h"

namespace v8 {
namespace internal {

// Abstract base class for handles that can operate on objects with differing
// ElementsKinds.
class ElementsAccessor {
 public:
  ElementsAccessor() { }
  virtual ~ElementsAccessor() { }
  virtual MaybeObject* GetWithReceiver(JSObject* obj,
                                       Object* receiver,
                                       uint32_t index) = 0;

  virtual MaybeObject* Delete(JSObject* obj,
                              uint32_t index,
                              JSReceiver::DeleteMode mode) = 0;

  virtual MaybeObject* AddElementsToFixedArray(FixedArrayBase* from,
                                               FixedArray* to) = 0;

  // Returns a shared ElementsAccessor for the specified ElementsKind.
  static ElementsAccessor* ForKind(JSObject::ElementsKind elements_kind) {
    ASSERT(elements_kind < JSObject::kElementsKindCount);
    return elements_accessors_[elements_kind];
  }

  static void InitializeOncePerProcess();

 private:
  static ElementsAccessor** elements_accessors_;

  DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
};

} }  // namespace v8::internal

#endif  // V8_ELEMENTS_H_