1/*
2 * Copyright (C) 2013 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#include "config.h"
27#include "DFGLazyJSValue.h"
28
29#if ENABLE(DFG_JIT)
30
31#include "JSCInlines.h"
32
33namespace JSC { namespace DFG {
34
35JSValue LazyJSValue::getValue(VM& vm) const
36{
37    switch (m_kind) {
38    case KnownValue:
39        return value();
40    case SingleCharacterString:
41        return jsSingleCharacterString(&vm, u.character);
42    case KnownStringImpl:
43        return jsString(&vm, u.stringImpl);
44    }
45    RELEASE_ASSERT_NOT_REACHED();
46    return value();
47}
48
49static TriState equalToSingleCharacter(JSValue value, UChar character)
50{
51    if (!value.isString())
52        return FalseTriState;
53
54    JSString* jsString = asString(value);
55    if (jsString->length() != 1)
56        return FalseTriState;
57
58    const StringImpl* string = jsString->tryGetValueImpl();
59    if (!string)
60        return MixedTriState;
61
62    return triState(string->at(0) == character);
63}
64
65static TriState equalToStringImpl(JSValue value, StringImpl* stringImpl)
66{
67    if (!value.isString())
68        return FalseTriState;
69
70    JSString* jsString = asString(value);
71    const StringImpl* string = jsString->tryGetValueImpl();
72    if (!string)
73        return MixedTriState;
74
75    return triState(WTF::equal(stringImpl, string));
76}
77
78TriState LazyJSValue::strictEqual(const LazyJSValue& other) const
79{
80    switch (m_kind) {
81    case KnownValue:
82        switch (other.m_kind) {
83        case KnownValue:
84            return JSValue::pureStrictEqual(value(), other.value());
85        case SingleCharacterString:
86            return equalToSingleCharacter(value(), other.character());
87        case KnownStringImpl:
88            return equalToStringImpl(value(), other.stringImpl());
89        }
90        break;
91    case SingleCharacterString:
92        switch (other.m_kind) {
93        case SingleCharacterString:
94            return triState(character() == other.character());
95        case KnownStringImpl:
96            if (other.stringImpl()->length() != 1)
97                return FalseTriState;
98            return triState(other.stringImpl()->at(0) == character());
99        default:
100            return other.strictEqual(*this);
101        }
102        break;
103    case KnownStringImpl:
104        switch (other.m_kind) {
105        case KnownStringImpl:
106            return triState(WTF::equal(stringImpl(), other.stringImpl()));
107        default:
108            return other.strictEqual(*this);
109        }
110        break;
111    }
112    RELEASE_ASSERT_NOT_REACHED();
113    return FalseTriState;
114}
115
116void LazyJSValue::dumpInContext(PrintStream& out, DumpContext* context) const
117{
118    switch (m_kind) {
119    case KnownValue:
120        value().dumpInContext(out, context);
121        return;
122    case SingleCharacterString:
123        out.print("Lazy:SingleCharacterString(");
124        out.printf("%04X", static_cast<unsigned>(character()));
125        out.print(" / ", StringImpl::utf8ForCharacters(&u.character, 1), ")");
126        return;
127    case KnownStringImpl:
128        out.print("Lazy:String(", stringImpl(), ")");
129        return;
130    }
131    RELEASE_ASSERT_NOT_REACHED();
132}
133
134void LazyJSValue::dump(PrintStream& out) const
135{
136    dumpInContext(out, 0);
137}
138
139} } // namespace JSC::DFG
140
141#endif // ENABLE(DFG_JIT)
142
143