1/*
2 * Copyright (C) 2016-2019 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#if ENABLE(WEBASSEMBLY)
29
30#include "JSDestructibleObject.h"
31#include "JSObject.h"
32#include "WasmMemory.h"
33#include <wtf/Ref.h>
34#include <wtf/RefPtr.h>
35
36namespace JSC {
37
38class ArrayBuffer;
39class JSArrayBuffer;
40
41class JSWebAssemblyMemory final : public JSDestructibleObject {
42public:
43 typedef JSDestructibleObject Base;
44
45 template<typename CellType, SubspaceAccess>
46 static CompleteSubspace* subspaceFor(VM& vm)
47 {
48 // We hold onto a lot of memory, so it makes a lot of sense to be swept eagerly.
49 return &vm.eagerlySweptDestructibleObjectSpace;
50 }
51
52 static JSWebAssemblyMemory* create(ExecState*, VM&, Structure*);
53 static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
54
55 DECLARE_EXPORT_INFO;
56
57 void adopt(Ref<Wasm::Memory>&&);
58 Wasm::Memory& memory() { return m_memory.get(); }
59 JSArrayBuffer* buffer(VM& vm, JSGlobalObject*);
60 Wasm::PageCount grow(VM&, ExecState*, uint32_t delta);
61 void growSuccessCallback(VM&, Wasm::PageCount oldPageCount, Wasm::PageCount newPageCount);
62
63private:
64 JSWebAssemblyMemory(VM&, Structure*);
65 void finishCreation(VM&);
66 static void destroy(JSCell*);
67 static void visitChildren(JSCell*, SlotVisitor&);
68
69 Ref<Wasm::Memory> m_memory;
70 WriteBarrier<JSArrayBuffer> m_bufferWrapper;
71 RefPtr<ArrayBuffer> m_buffer;
72};
73
74} // namespace JSC
75
76#endif // ENABLE(WEBASSEMBLY)
77