1/*
2 * Copyright (C) 2017-2019 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 "DeferGC.h"
29#include "DisallowVMReentry.h"
30#include "VM.h"
31
32namespace JSC {
33
34class VM;
35class JSObject;
36
37#ifdef NDEBUG
38
39class ObjectInitializationScope {
40public:
41 ALWAYS_INLINE ObjectInitializationScope(VM& vm)
42 : m_vm(vm)
43 { }
44 ALWAYS_INLINE ~ObjectInitializationScope()
45 {
46 m_vm.heap.mutatorFence();
47 }
48
49 ALWAYS_INLINE VM& vm() const { return m_vm; }
50 ALWAYS_INLINE void notifyAllocated(JSObject*, bool) { }
51 ALWAYS_INLINE void notifyInitialized(JSObject*) { }
52
53private:
54 VM& m_vm;
55};
56
57#else // not NDEBUG
58
59class ObjectInitializationScope {
60public:
61 JS_EXPORT_PRIVATE ObjectInitializationScope(VM&);
62 JS_EXPORT_PRIVATE ~ObjectInitializationScope();
63
64 VM& vm() const { return m_vm; }
65 void notifyAllocated(JSObject*, bool wasCreatedUninitialized);
66 void notifyInitialized(JSObject*);
67
68private:
69 void verifyPropertiesAreInitialized(JSObject*);
70
71 VM& m_vm;
72 DisallowGC m_disallowGC;
73 DisallowVMReentry m_disallowVMReentry;
74 JSObject* m_object { nullptr };
75};
76
77#endif // NDEBUG
78
79} // namespace JSC
80