1/*
2 * Copyright (C) 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#include "CacheUpdate.h"
29#include "LeafExecutable.h"
30#include "ParserModes.h"
31#include <wtf/MallocPtr.h>
32#include <wtf/Noncopyable.h>
33#include <wtf/RefCounted.h>
34#include <wtf/Vector.h>
35
36namespace JSC {
37
38class UnlinkedFunctionExecutable;
39
40class CachedBytecode : public RefCounted<CachedBytecode> {
41 WTF_MAKE_NONCOPYABLE(CachedBytecode);
42
43public:
44 static Ref<CachedBytecode> create()
45 {
46 return adoptRef(*new CachedBytecode(CachePayload::makeEmptyPayload()));
47 }
48
49#if !OS(WINDOWS)
50 static Ref<CachedBytecode> create(void* data, size_t size)
51 {
52 return adoptRef(*new CachedBytecode(CachePayload::makeMappedPayload(data, size)));
53 }
54#endif
55
56 static Ref<CachedBytecode> create(MallocPtr<uint8_t>&& data, size_t size, LeafExecutableMap&& leafExecutables)
57 {
58 return adoptRef(*new CachedBytecode(CachePayload::makeMallocPayload(WTFMove(data), size), WTFMove(leafExecutables)));
59 }
60
61 LeafExecutableMap& leafExecutables() { return m_leafExecutables; }
62
63 JS_EXPORT_PRIVATE void addGlobalUpdate(Ref<CachedBytecode>);
64 JS_EXPORT_PRIVATE void addFunctionUpdate(const UnlinkedFunctionExecutable*, CodeSpecializationKind, Ref<CachedBytecode>);
65
66 using ForEachUpdateCallback = Function<void(off_t, const void*, size_t)>;
67 JS_EXPORT_PRIVATE void commitUpdates(const ForEachUpdateCallback&) const;
68
69 const uint8_t* data() const { return m_payload.data(); }
70 size_t size() const { return m_payload.size(); }
71 bool hasUpdates() const { return !m_updates.isEmpty(); }
72 size_t sizeForUpdate() const { return m_size; }
73
74private:
75 CachedBytecode(CachePayload&& payload, LeafExecutableMap&& leafExecutables = { })
76 : m_size(payload.size())
77 , m_payload(WTFMove(payload))
78 , m_leafExecutables(WTFMove(leafExecutables))
79 {
80 }
81
82 void copyLeafExecutables(const CachedBytecode&);
83
84 size_t m_size { 0 };
85 CachePayload m_payload;
86 LeafExecutableMap m_leafExecutables;
87 Vector<CacheUpdate> m_updates;
88};
89
90
91} // namespace JSC
92