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#pragma once
27
28#include "Handle.h"
29#include "TypedArrayController.h"
30#include "WeakHandleOwner.h"
31
32namespace JSC {
33
34// The default controller used for managing the relationship between
35// array buffers and their wrappers in JavaScriptCore. This isn't what
36// WebCore uses, but it is what JSC uses when running standalone. This
37// is pretty simple:
38//
39// - If the JSArrayBuffer is live, then the ArrayBuffer stays alive.
40//
41// - If there is a JSArrayBufferView that is holding an ArrayBuffer
42// then any existing wrapper for that ArrayBuffer will be kept
43// alive.
44//
45// - If you ask an ArrayBuffer for a JSArrayBuffer after one had
46// already been created and it didn't die, then you get the same
47// one.
48
49class SimpleTypedArrayController : public TypedArrayController {
50public:
51 SimpleTypedArrayController();
52 virtual ~SimpleTypedArrayController();
53
54 JSArrayBuffer* toJS(ExecState*, JSGlobalObject*, ArrayBuffer*) override;
55 void registerWrapper(JSGlobalObject*, ArrayBuffer*, JSArrayBuffer*) override;
56 bool isAtomicsWaitAllowedOnCurrentThread() override;
57
58private:
59 class JSArrayBufferOwner : public WeakHandleOwner {
60 public:
61 bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, SlotVisitor&, const char** reason) override;
62 void finalize(JSC::Handle<JSC::Unknown>, void* context) override;
63 };
64
65 JSArrayBufferOwner m_owner;
66};
67
68} // namespace JSC
69