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 "Options.h"
31#include "WasmContext.h"
32#include "WasmInstance.h"
33#include <mutex>
34#include <wtf/FastTLS.h>
35
36namespace JSC { namespace Wasm {
37
38inline bool Context::useFastTLS()
39{
40#if ENABLE(FAST_TLS_JIT)
41 return Options::useFastTLSForWasmContext();
42#else
43 return false;
44#endif
45}
46
47inline Instance* Context::load() const
48{
49#if ENABLE(FAST_TLS_JIT)
50 if (useFastTLS())
51 return bitwise_cast<Instance*>(_pthread_getspecific_direct(WTF_WASM_CONTEXT_KEY));
52#endif
53 return instance;
54}
55
56inline void Context::store(Instance* inst, void* softStackLimit)
57{
58 if (inst)
59 inst->setCachedStackLimit(softStackLimit);
60
61#if ENABLE(FAST_TLS_JIT)
62 if (useFastTLS())
63 _pthread_setspecific_direct(WTF_WASM_CONTEXT_KEY, bitwise_cast<void*>(inst));
64 else
65#endif
66 instance = inst;
67}
68
69} } // namespace JSC::Wasm
70
71#endif // ENABLE(WEBASSEMBLY)
72