1/*
2 * Copyright (C) 2017 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 <wtf/Lock.h>
31#include <wtf/UniqueArray.h>
32#include <wtf/Vector.h>
33
34namespace JSC { namespace Wasm {
35
36class Instance;
37
38struct Context {
39 Instance* load() const;
40 void store(Instance*, void* softStackLimit);
41
42 static bool useFastTLS();
43
44 Instance** pointerToInstance()
45 {
46 ASSERT(!useFastTLS());
47 return &instance;
48 }
49
50 static Instance* tryLoadInstanceFromTLS();
51
52 uint64_t* scratchBufferForSize(size_t numberOfSlots);
53
54private:
55 Instance* instance { nullptr };
56 Vector<UniqueArray<uint64_t>> m_scratchBuffers;
57 size_t m_sizeOfLastScratchBuffer { 0 };
58 Lock m_scratchBufferLock;
59};
60
61} } // namespace JSC::Wasm
62
63#endif // ENABLE(WEBASSEMBLY)
64