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