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1 /*
2  * Copyright (C) 2012 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 "bindings/core/v8/V8PerContextData.h"
33 
34 #include "bindings/core/v8/ScriptState.h"
35 #include "bindings/core/v8/V8Binding.h"
36 #include "bindings/core/v8/V8ObjectConstructor.h"
37 #include "wtf/StringExtras.h"
38 
39 #include <stdlib.h>
40 
41 namespace blink {
42 
V8PerContextData(v8::Handle<v8::Context> context)43 V8PerContextData::V8PerContextData(v8::Handle<v8::Context> context)
44     : m_isolate(context->GetIsolate())
45     , m_wrapperBoilerplates(m_isolate)
46     , m_constructorMap(m_isolate)
47     , m_contextHolder(adoptPtr(new gin::ContextHolder(m_isolate)))
48     , m_context(m_isolate, context)
49     , m_customElementBindings(adoptPtr(new CustomElementBindingMap()))
50     , m_activityLogger(0)
51     , m_compiledPrivateScript(m_isolate)
52 {
53     m_contextHolder->SetContext(context);
54 
55     v8::Context::Scope contextScope(context);
56     ASSERT(m_errorPrototype.isEmpty());
57     v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(context->Global()->Get(v8AtomicString(m_isolate, "Error")));
58     ASSERT(!object.IsEmpty());
59     v8::Handle<v8::Value> prototypeValue = object->Get(v8AtomicString(m_isolate, "prototype"));
60     ASSERT(!prototypeValue.IsEmpty());
61     m_errorPrototype.set(m_isolate, prototypeValue);
62 }
63 
~V8PerContextData()64 V8PerContextData::~V8PerContextData()
65 {
66 }
67 
create(v8::Handle<v8::Context> context)68 PassOwnPtr<V8PerContextData> V8PerContextData::create(v8::Handle<v8::Context> context)
69 {
70     return adoptPtr(new V8PerContextData(context));
71 }
72 
from(v8::Handle<v8::Context> context)73 V8PerContextData* V8PerContextData::from(v8::Handle<v8::Context> context)
74 {
75     return ScriptState::from(context)->perContextData();
76 }
77 
createWrapperFromCacheSlowCase(const WrapperTypeInfo * type)78 v8::Local<v8::Object> V8PerContextData::createWrapperFromCacheSlowCase(const WrapperTypeInfo* type)
79 {
80     ASSERT(!m_errorPrototype.isEmpty());
81 
82     v8::Context::Scope scope(context());
83     v8::Local<v8::Function> function = constructorForType(type);
84     v8::Local<v8::Object> instanceTemplate = V8ObjectConstructor::newInstance(m_isolate, function);
85     if (!instanceTemplate.IsEmpty()) {
86         m_wrapperBoilerplates.Set(type, instanceTemplate);
87         return instanceTemplate->Clone();
88     }
89     return v8::Local<v8::Object>();
90 }
91 
constructorForTypeSlowCase(const WrapperTypeInfo * type)92 v8::Local<v8::Function> V8PerContextData::constructorForTypeSlowCase(const WrapperTypeInfo* type)
93 {
94     ASSERT(!m_errorPrototype.isEmpty());
95 
96     v8::Context::Scope scope(context());
97     v8::Handle<v8::FunctionTemplate> functionTemplate = type->domTemplate(m_isolate);
98     // Getting the function might fail if we're running out of stack or memory.
99     v8::TryCatch tryCatch;
100     v8::Local<v8::Function> function = functionTemplate->GetFunction();
101     if (function.IsEmpty())
102         return v8::Local<v8::Function>();
103 
104     if (type->parentClass) {
105         v8::Local<v8::Object> prototypeTemplate = constructorForType(type->parentClass);
106         if (prototypeTemplate.IsEmpty())
107             return v8::Local<v8::Function>();
108         function->SetPrototype(prototypeTemplate);
109     }
110 
111     v8::Local<v8::Value> prototypeValue = function->Get(v8AtomicString(m_isolate, "prototype"));
112     if (!prototypeValue.IsEmpty() && prototypeValue->IsObject()) {
113         v8::Local<v8::Object> prototypeObject = v8::Local<v8::Object>::Cast(prototypeValue);
114         if (prototypeObject->InternalFieldCount() == v8PrototypeInternalFieldcount
115             && type->wrapperTypePrototype == WrapperTypeInfo::WrapperTypeObjectPrototype)
116             prototypeObject->SetAlignedPointerInInternalField(v8PrototypeTypeIndex, const_cast<WrapperTypeInfo*>(type));
117         type->installConditionallyEnabledMethods(prototypeObject, m_isolate);
118         if (type->wrapperTypePrototype == WrapperTypeInfo::WrapperTypeExceptionPrototype)
119             prototypeObject->SetPrototype(m_errorPrototype.newLocal(m_isolate));
120     }
121 
122     m_constructorMap.Set(type, function);
123 
124     return function;
125 }
126 
prototypeForType(const WrapperTypeInfo * type)127 v8::Local<v8::Object> V8PerContextData::prototypeForType(const WrapperTypeInfo* type)
128 {
129     v8::Local<v8::Object> constructor = constructorForType(type);
130     if (constructor.IsEmpty())
131         return v8::Local<v8::Object>();
132     return constructor->Get(v8String(m_isolate, "prototype")).As<v8::Object>();
133 }
134 
addCustomElementBinding(CustomElementDefinition * definition,PassOwnPtr<CustomElementBinding> binding)135 void V8PerContextData::addCustomElementBinding(CustomElementDefinition* definition, PassOwnPtr<CustomElementBinding> binding)
136 {
137     ASSERT(!m_customElementBindings->contains(definition));
138     m_customElementBindings->add(definition, binding);
139 }
140 
clearCustomElementBinding(CustomElementDefinition * definition)141 void V8PerContextData::clearCustomElementBinding(CustomElementDefinition* definition)
142 {
143     CustomElementBindingMap::iterator it = m_customElementBindings->find(definition);
144     ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end());
145     m_customElementBindings->remove(it);
146 }
147 
customElementBinding(CustomElementDefinition * definition)148 CustomElementBinding* V8PerContextData::customElementBinding(CustomElementDefinition* definition)
149 {
150     CustomElementBindingMap::const_iterator it = m_customElementBindings->find(definition);
151     ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end());
152     return it->value.get();
153 }
154 
155 
createDebugData(const char * worldName,int debugId,v8::Isolate * isolate)156 static v8::Handle<v8::Value> createDebugData(const char* worldName, int debugId, v8::Isolate* isolate)
157 {
158     char buffer[32];
159     unsigned wanted;
160     if (debugId == -1)
161         wanted = snprintf(buffer, sizeof(buffer), "%s", worldName);
162     else
163         wanted = snprintf(buffer, sizeof(buffer), "%s,%d", worldName, debugId);
164 
165     if (wanted < sizeof(buffer))
166         return v8AtomicString(isolate, buffer);
167 
168     return v8::Undefined(isolate);
169 }
170 
debugData(v8::Handle<v8::Context> context)171 static v8::Handle<v8::Value> debugData(v8::Handle<v8::Context> context)
172 {
173     v8::Context::Scope contextScope(context);
174     return context->GetEmbedderData(v8ContextDebugIdIndex);
175 }
176 
setDebugData(v8::Handle<v8::Context> context,v8::Handle<v8::Value> value)177 static void setDebugData(v8::Handle<v8::Context> context, v8::Handle<v8::Value> value)
178 {
179     v8::Context::Scope contextScope(context);
180     context->SetEmbedderData(v8ContextDebugIdIndex, value);
181 }
182 
setContextDebugData(v8::Handle<v8::Context> context,const char * worldName,int debugId)183 bool V8PerContextDebugData::setContextDebugData(v8::Handle<v8::Context> context, const char* worldName, int debugId)
184 {
185     if (!debugData(context)->IsUndefined())
186         return false;
187     v8::HandleScope scope(context->GetIsolate());
188     v8::Handle<v8::Value> debugData = createDebugData(worldName, debugId, context->GetIsolate());
189     setDebugData(context, debugData);
190     return true;
191 }
192 
contextDebugId(v8::Handle<v8::Context> context)193 int V8PerContextDebugData::contextDebugId(v8::Handle<v8::Context> context)
194 {
195     v8::HandleScope scope(context->GetIsolate());
196     v8::Handle<v8::Value> data = debugData(context);
197 
198     if (!data->IsString())
199         return -1;
200     v8::String::Utf8Value utf8(data);
201     char* comma = strnstr(*utf8, ",", utf8.length());
202     if (!comma)
203         return -1;
204     return atoi(comma + 1);
205 }
206 
compiledPrivateScript(String className)207 v8::Handle<v8::Value> V8PerContextData::compiledPrivateScript(String className)
208 {
209     return m_compiledPrivateScript.Get(className);
210 }
211 
setCompiledPrivateScript(String className,v8::Handle<v8::Value> compiledObject)212 void V8PerContextData::setCompiledPrivateScript(String className, v8::Handle<v8::Value> compiledObject)
213 {
214     m_compiledPrivateScript.Set(className, compiledObject);
215 }
216 
217 } // namespace blink
218