1/*
2 * Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
3 * Copyright (C) 2018 Igalia S.L.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "JSWeakValue.h"
29
30#include "JSCInlines.h"
31#include "WeakHandleOwner.h"
32
33namespace JSC {
34
35JSWeakValue::~JSWeakValue()
36{
37 clear();
38}
39
40void JSWeakValue::clear()
41{
42 switch (m_tag) {
43 case WeakTypeTag::NotSet:
44 return;
45 case WeakTypeTag::Primitive:
46 m_value.primitive = JSValue();
47 return;
48 case WeakTypeTag::Object:
49 m_value.object.clear();
50 return;
51 case WeakTypeTag::String:
52 m_value.string.clear();
53 return;
54 }
55 RELEASE_ASSERT_NOT_REACHED();
56}
57
58bool JSWeakValue::isClear() const
59{
60 switch (m_tag) {
61 case WeakTypeTag::NotSet:
62 return true;
63 case WeakTypeTag::Primitive:
64 return !m_value.primitive;
65 case WeakTypeTag::Object:
66 return !m_value.object;
67 case WeakTypeTag::String:
68 return !m_value.string;
69 }
70 RELEASE_ASSERT_NOT_REACHED();
71}
72
73void JSWeakValue::setPrimitive(JSValue primitive)
74{
75 ASSERT(!isSet());
76 ASSERT(!m_value.primitive);
77 ASSERT(primitive.isPrimitive());
78 m_tag = WeakTypeTag::Primitive;
79 m_value.primitive = primitive;
80}
81
82void JSWeakValue::setObject(JSObject* object, WeakHandleOwner& owner, void* context)
83{
84 ASSERT(!isSet());
85 ASSERT(!m_value.object);
86 m_tag = WeakTypeTag::Object;
87 Weak<JSObject> weak(object, &owner, context);
88 m_value.object.swap(weak);
89}
90
91void JSWeakValue::setString(JSString* string, WeakHandleOwner& owner, void* context)
92{
93 ASSERT(!isSet());
94 ASSERT(!m_value.string);
95 m_tag = WeakTypeTag::String;
96 Weak<JSString> weak(string, &owner, context);
97 m_value.string.swap(weak);
98}
99
100} // namespace JSC
101