1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "bindings/v8/V8ValueCache.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8Utilities.h"
#include "wtf/text/StringHash.h"
namespace WebCore {
static v8::Local<v8::String> makeExternalString(const String& string, v8::Isolate* isolate)
{
if (string.is8Bit()) {
WebCoreStringResource8* stringResource = new WebCoreStringResource8(string);
v8::Local<v8::String> newString = v8::String::NewExternal(isolate, stringResource);
if (newString.IsEmpty())
delete stringResource;
return newString;
}
WebCoreStringResource16* stringResource = new WebCoreStringResource16(string);
v8::Local<v8::String> newString = v8::String::NewExternal(isolate, stringResource);
if (newString.IsEmpty())
delete stringResource;
return newString;
}
v8::Handle<v8::String> StringCache::v8ExternalStringSlow(StringImpl* stringImpl, v8::Isolate* isolate)
{
if (!stringImpl->length())
return v8::String::Empty(isolate);
UnsafePersistent<v8::String> cachedV8String = m_stringCache.get(stringImpl);
if (!cachedV8String.isEmpty()) {
m_lastStringImpl = stringImpl;
m_lastV8String = cachedV8String;
return cachedV8String.newLocal(isolate);
}
return createStringAndInsertIntoCache(stringImpl, isolate);
}
void StringCache::setReturnValueFromStringSlow(v8::ReturnValue<v8::Value> returnValue, StringImpl* stringImpl)
{
if (!stringImpl->length()) {
returnValue.SetEmptyString();
return;
}
UnsafePersistent<v8::String> cachedV8String = m_stringCache.get(stringImpl);
if (!cachedV8String.isEmpty()) {
m_lastStringImpl = stringImpl;
m_lastV8String = cachedV8String;
returnValue.Set(*cachedV8String.persistent());
return;
}
returnValue.Set(createStringAndInsertIntoCache(stringImpl, returnValue.GetIsolate()));
}
v8::Local<v8::String> StringCache::createStringAndInsertIntoCache(StringImpl* stringImpl, v8::Isolate* isolate)
{
ASSERT(!m_stringCache.contains(stringImpl));
ASSERT(stringImpl->length());
v8::Local<v8::String> newString = makeExternalString(String(stringImpl), isolate);
if (newString.IsEmpty())
return newString;
v8::Persistent<v8::String> wrapper(isolate, newString);
stringImpl->ref();
wrapper.MarkIndependent();
wrapper.SetWeak(stringImpl, &setWeakCallback);
m_lastV8String = UnsafePersistent<v8::String>(wrapper);
m_lastStringImpl = stringImpl;
m_stringCache.set(stringImpl, m_lastV8String);
return newString;
}
void StringCache::setWeakCallback(const v8::WeakCallbackData<v8::String, StringImpl>& data)
{
StringCache* stringCache = V8PerIsolateData::from(data.GetIsolate())->stringCache();
stringCache->m_lastStringImpl = 0;
stringCache->m_lastV8String.clear();
ASSERT(stringCache->m_stringCache.contains(data.GetParameter()));
stringCache->m_stringCache.get(data.GetParameter()).dispose();
stringCache->m_stringCache.remove(data.GetParameter());
data.GetParameter()->deref();
}
} // namespace WebCore
|
