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/V8Binding.h" 35 #include "bindings/v8/V8ObjectConstructor.h" 36 #include "wtf/StringExtras.h" 37 38 #include <stdlib.h> 39 40 namespace WebCore { 41 42 template<typename Map> 43 static void disposeMapWithUnsafePersistentValues(Map* map) 44 { 45 typename Map::iterator it = map->begin(); 46 for (; it != map->end(); ++it) 47 it->value.dispose(); 48 map->clear(); 49 } 50 51 void V8PerContextData::dispose() 52 { 53 v8::HandleScope handleScope(m_isolate); 54 V8PerContextDataHolder::from(v8::Local<v8::Context>::New(m_isolate, m_context))->setPerContextData(0); 55 56 disposeMapWithUnsafePersistentValues(&m_wrapperBoilerplates); 57 disposeMapWithUnsafePersistentValues(&m_constructorMap); 58 m_customElementBindings.clear(); 59 60 m_context.Reset(); 61 } 62 63 #define V8_STORE_PRIMORDIAL(name, Name) \ 64 { \ 65 ASSERT(m_##name##Prototype.isEmpty()); \ 66 v8::Handle<v8::String> symbol = v8::String::NewFromUtf8(m_isolate, #Name, v8::String::kInternalizedString); \ 67 if (symbol.IsEmpty()) \ 68 return false; \ 69 v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(v8::Local<v8::Context>::New(m_isolate, m_context)->Global()->Get(symbol)); \ 70 if (object.IsEmpty()) \ 71 return false; \ 72 v8::Handle<v8::Value> prototypeValue = object->Get(prototypeString); \ 73 if (prototypeValue.IsEmpty()) \ 74 return false; \ 75 m_##name##Prototype.set(m_isolate, prototypeValue); \ 76 } 77 78 bool V8PerContextData::init() 79 { 80 v8::Handle<v8::Context> context = v8::Local<v8::Context>::New(m_isolate, m_context); 81 V8PerContextDataHolder::from(context)->setPerContextData(this); 82 83 v8::Handle<v8::String> prototypeString = v8AtomicString(m_isolate, "prototype"); 84 if (prototypeString.IsEmpty()) 85 return false; 86 87 V8_STORE_PRIMORDIAL(error, Error); 88 89 return true; 90 } 91 92 #undef V8_STORE_PRIMORDIAL 93 94 v8::Local<v8::Object> V8PerContextData::createWrapperFromCacheSlowCase(const WrapperTypeInfo* type) 95 { 96 ASSERT(!m_errorPrototype.isEmpty()); 97 98 v8::Context::Scope scope(v8::Local<v8::Context>::New(m_isolate, m_context)); 99 v8::Local<v8::Function> function = constructorForType(type); 100 v8::Local<v8::Object> instanceTemplate = V8ObjectConstructor::newInstance(function); 101 if (!instanceTemplate.IsEmpty()) { 102 m_wrapperBoilerplates.set(type, UnsafePersistent<v8::Object>(m_isolate, instanceTemplate)); 103 return instanceTemplate->Clone(); 104 } 105 return v8::Local<v8::Object>(); 106 } 107 108 v8::Local<v8::Function> V8PerContextData::constructorForTypeSlowCase(const WrapperTypeInfo* type) 109 { 110 ASSERT(!m_errorPrototype.isEmpty()); 111 112 v8::Context::Scope scope(v8::Local<v8::Context>::New(m_isolate, m_context)); 113 v8::Handle<v8::FunctionTemplate> functionTemplate = type->domTemplate(m_isolate, worldType(m_isolate)); 114 // Getting the function might fail if we're running out of stack or memory. 115 v8::TryCatch tryCatch; 116 v8::Local<v8::Function> function = functionTemplate->GetFunction(); 117 if (function.IsEmpty()) 118 return v8::Local<v8::Function>(); 119 120 if (type->parentClass) { 121 v8::Local<v8::Object> prototypeTemplate = constructorForType(type->parentClass); 122 if (prototypeTemplate.IsEmpty()) 123 return v8::Local<v8::Function>(); 124 function->SetPrototype(prototypeTemplate); 125 } 126 127 v8::Local<v8::Value> prototypeValue = function->Get(v8AtomicString(m_isolate, "prototype")); 128 if (!prototypeValue.IsEmpty() && prototypeValue->IsObject()) { 129 v8::Local<v8::Object> prototypeObject = v8::Local<v8::Object>::Cast(prototypeValue); 130 if (prototypeObject->InternalFieldCount() == v8PrototypeInternalFieldcount 131 && type->wrapperTypePrototype == WrapperTypeObjectPrototype) 132 prototypeObject->SetAlignedPointerInInternalField(v8PrototypeTypeIndex, const_cast<WrapperTypeInfo*>(type)); 133 type->installPerContextEnabledMethods(prototypeObject, m_isolate); 134 if (type->wrapperTypePrototype == WrapperTypeErrorPrototype) 135 prototypeObject->SetPrototype(m_errorPrototype.newLocal(m_isolate)); 136 } 137 138 m_constructorMap.set(type, UnsafePersistent<v8::Function>(m_isolate, function)); 139 140 return function; 141 } 142 143 v8::Local<v8::Object> V8PerContextData::prototypeForType(const WrapperTypeInfo* type) 144 { 145 v8::Local<v8::Object> constructor = constructorForType(type); 146 if (constructor.IsEmpty()) 147 return v8::Local<v8::Object>(); 148 return constructor->Get(v8String(m_isolate, "prototype")).As<v8::Object>(); 149 } 150 151 void V8PerContextData::addCustomElementBinding(CustomElementDefinition* definition, PassOwnPtr<CustomElementBinding> binding) 152 { 153 ASSERT(!m_customElementBindings->contains(definition)); 154 m_customElementBindings->add(definition, binding); 155 } 156 157 void V8PerContextData::clearCustomElementBinding(CustomElementDefinition* definition) 158 { 159 CustomElementBindingMap::iterator it = m_customElementBindings->find(definition); 160 ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end()); 161 m_customElementBindings->remove(it); 162 } 163 164 CustomElementBinding* V8PerContextData::customElementBinding(CustomElementDefinition* definition) 165 { 166 CustomElementBindingMap::const_iterator it = m_customElementBindings->find(definition); 167 ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end()); 168 return it->value.get(); 169 } 170 171 172 static v8::Handle<v8::Value> createDebugData(const char* worldName, int debugId, v8::Isolate* isolate) 173 { 174 char buffer[32]; 175 unsigned wanted; 176 if (debugId == -1) 177 wanted = snprintf(buffer, sizeof(buffer), "%s", worldName); 178 else 179 wanted = snprintf(buffer, sizeof(buffer), "%s,%d", worldName, debugId); 180 181 if (wanted < sizeof(buffer)) 182 return v8AtomicString(isolate, buffer); 183 184 return v8::Undefined(isolate); 185 } 186 187 static v8::Handle<v8::Value> debugData(v8::Handle<v8::Context> context) 188 { 189 v8::Context::Scope contextScope(context); 190 return context->GetEmbedderData(v8ContextDebugIdIndex); 191 } 192 193 static void setDebugData(v8::Handle<v8::Context> context, v8::Handle<v8::Value> value) 194 { 195 v8::Context::Scope contextScope(context); 196 context->SetEmbedderData(v8ContextDebugIdIndex, value); 197 } 198 199 bool V8PerContextDebugData::setContextDebugData(v8::Handle<v8::Context> context, const char* worldName, int debugId) 200 { 201 if (!debugData(context)->IsUndefined()) 202 return false; 203 v8::HandleScope scope(context->GetIsolate()); 204 v8::Handle<v8::Value> debugData = createDebugData(worldName, debugId, context->GetIsolate()); 205 setDebugData(context, debugData); 206 return true; 207 } 208 209 int V8PerContextDebugData::contextDebugId(v8::Handle<v8::Context> context) 210 { 211 v8::HandleScope scope(context->GetIsolate()); 212 v8::Handle<v8::Value> data = debugData(context); 213 214 if (!data->IsString()) 215 return -1; 216 v8::String::Utf8Value utf8(data); 217 char* comma = strnstr(*utf8, ",", utf8.length()); 218 if (!comma) 219 return -1; 220 return atoi(comma + 1); 221 } 222 223 } // namespace WebCore 224
