1 /*
2 * Copyright (C) 2009 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "DateExtension.h"
33
34 #include "V8Proxy.h"
35 #include "V8HiddenPropertyName.h"
36
37 namespace WebCore {
38
39 DateExtension* DateExtension::extension;
40
41 static const char* dateExtensionName = "v8/DateExtension";
42 static const char* dateExtensionScript =
43 "(function () {"
44 " var counter;"
45 " var orig_getTime;"
46 " function getTimeOverride() {"
47 " if (++counter > 1000)"
48 " OnSleepDetected();"
49 " return orig_getTime.call(this);"
50 " };"
51 " function enableSleepDetection(enable) {"
52 " if (enable) {"
53 " counter = 0;"
54 " orig_getTime = Date.prototype.getTime;"
55 " Date.prototype.getTime = getTimeOverride;"
56 " } else {"
57 " Date.prototype.getTime = orig_getTime;"
58 " }"
59 " };"
60 " native function Setup();"
61 " native function OnSleepDetected();"
62 " Setup(Date, enableSleepDetection);"
63 "})()";
64
DateExtension()65 DateExtension::DateExtension() : v8::Extension(dateExtensionName, dateExtensionScript)
66 {
67 }
68
get()69 DateExtension* DateExtension::get()
70 {
71 if (!extension)
72 extension = new DateExtension();
73 return extension;
74 }
75
setAllowSleep(bool allow)76 void DateExtension::setAllowSleep(bool allow)
77 {
78 v8::Local<v8::Value> result = V8Proxy::currentContext()->Global()->Get(v8::String::New("Date"));
79 if (result.IsEmpty() || !result->IsObject())
80 return;
81
82 v8::Handle<v8::Object> dateObject = v8::Handle<v8::Object>::Cast(result);
83 if (dateObject.IsEmpty())
84 return;
85
86 v8::Local<v8::Value> sleepFunctionHandle = dateObject->GetHiddenValue(V8HiddenPropertyName::sleepFunction());
87 if (sleepFunctionHandle.IsEmpty() || !sleepFunctionHandle->IsFunction())
88 return;
89
90 v8::Handle<v8::Value> argv[1];
91 argv[0] = v8::Boolean::New(!allow);
92 v8::Handle<v8::Function>::Cast(sleepFunctionHandle)->Call(v8::Object::New(), 1, argv);
93 }
94
GetNativeFunction(v8::Handle<v8::String> name)95 v8::Handle<v8::FunctionTemplate> DateExtension::GetNativeFunction(v8::Handle<v8::String> name)
96 {
97 if (name->Equals(v8::String::New("Setup")))
98 return v8::FunctionTemplate::New(Setup);
99 if (name->Equals(v8::String::New("OnSleepDetected")))
100 return v8::FunctionTemplate::New(OnSleepDetected);
101
102 return v8::Handle<v8::FunctionTemplate>();
103 }
104
Setup(const v8::Arguments & args)105 v8::Handle<v8::Value> DateExtension::Setup(const v8::Arguments& args)
106 {
107 if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsFunction())
108 return v8::Undefined();
109
110 v8::Handle<v8::Object> dateObject = v8::Handle<v8::Object>::Cast(args[0]);
111 v8::Handle<v8::Function> enableSleepDetectionFunction = v8::Handle<v8::Function>::Cast(args[1]);
112
113 dateObject->SetHiddenValue(V8HiddenPropertyName::sleepFunction(), enableSleepDetectionFunction);
114 return v8::Undefined();
115 }
116
OnSleepDetected(const v8::Arguments &)117 v8::Handle<v8::Value> DateExtension::OnSleepDetected(const v8::Arguments&)
118 {
119 V8Proxy::throwError(V8Proxy::GeneralError, "Too much time spent in unload handler.");
120 return v8::Undefined();
121 }
122
123 } // namespace WebCore
124