1/*
2 * Copyright (C) 2013 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 JSArrayBufferViewInlines_h
27#define JSArrayBufferViewInlines_h
28
29#include "ArrayBufferView.h"
30#include "JSArrayBufferView.h"
31#include "JSDataView.h"
32
33namespace JSC {
34
35inline ArrayBuffer* JSArrayBufferView::buffer()
36{
37 switch (m_mode) {
38 case WastefulTypedArray:
39 return existingBufferInButterfly();
40 case DataViewMode:
41 return jsCast<JSDataView*>(this)->buffer();
42 default:
43 return methodTable()->slowDownAndWasteMemory(this);
44 }
45}
46
47inline ArrayBuffer* JSArrayBufferView::existingBufferInButterfly()
48{
49 ASSERT(m_mode == WastefulTypedArray);
50 return butterfly()->indexingHeader()->arrayBuffer();
51}
52
53inline PassRefPtr<ArrayBufferView> JSArrayBufferView::impl()
54{
55 return methodTable()->getTypedArrayImpl(this);
56}
57
58inline void JSArrayBufferView::neuter()
59{
60 ASSERT(hasArrayBuffer());
61 m_length = 0;
62 m_vector.clear();
63}
64
65inline unsigned JSArrayBufferView::byteOffset()
66{
67 if (!hasArrayBuffer())
68 return 0;
69
70 ASSERT(!vector() == !buffer()->data());
71
72 ptrdiff_t delta =
73 bitwise_cast<uint8_t*>(vector()) - static_cast<uint8_t*>(buffer()->data());
74
75 unsigned result = static_cast<unsigned>(delta);
76 ASSERT(static_cast<ptrdiff_t>(result) == delta);
77 return result;
78}
79
80} // namespace JSC
81
82#endif // JSArrayBufferViewInlines_h
83
84