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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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* Get(FixedArrayBase* backing_store,
uint32_t key,
JSObject* holder,
Object* receiver) = 0;
virtual MaybeObject* Delete(JSObject* holder,
uint32_t key,
JSReceiver::DeleteMode mode) = 0;
virtual MaybeObject* AddElementsToFixedArray(FixedArrayBase* from,
FixedArray* to,
JSObject* holder,
Object* receiver) = 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 ElementsAccessor* ForArray(FixedArrayBase* array);
static void InitializeOncePerProcess();
protected:
friend class NonStrictArgumentsElementsAccessor;
virtual uint32_t GetCapacity(FixedArrayBase* backing_store) = 0;
virtual bool HasElementAtIndex(FixedArrayBase* backing_store,
uint32_t index,
JSObject* holder,
Object* receiver) = 0;
// Element handlers distinguish between indexes and keys when the manipulate
// elements. Indexes refer to elements in terms of their location in the
// underlying storage's backing store representation, and are between 0
// GetCapacity. Keys refer to elements in terms of the value that would be
// specific in JavaScript to access the element. In most implementations, keys
// are equivalent to indexes, and GetKeyForIndex returns the same value it is
// passed. In the NumberDictionary ElementsAccessor, GetKeyForIndex maps the
// index to a key using the KeyAt method on the NumberDictionary.
virtual uint32_t GetKeyForIndex(FixedArrayBase* backing_store,
uint32_t index) = 0;
private:
static ElementsAccessor** elements_accessors_;
DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
};
} } // namespace v8::internal
#endif // V8_ELEMENTS_H_
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