1 /* 2 * Copyright (C) 2013 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/V8CustomElementLifecycleCallbacks.h" 33 34 #include "bindings/core/v8/V8Element.h" 35 #include "bindings/v8/CustomElementBinding.h" 36 #include "bindings/v8/DOMDataStore.h" 37 #include "bindings/v8/ScriptController.h" 38 #include "bindings/v8/V8Binding.h" 39 #include "bindings/v8/V8HiddenValue.h" 40 #include "bindings/v8/V8PerContextData.h" 41 #include "core/dom/ExecutionContext.h" 42 #include "core/inspector/InspectorInstrumentation.h" 43 #include "wtf/PassOwnPtr.h" 44 45 namespace WebCore { 46 47 #define CALLBACK_LIST(V) \ 48 V(created, Created) \ 49 V(attached, Attached) \ 50 V(detached, Detached) \ 51 V(attributeChanged, AttributeChanged) 52 53 PassRefPtr<V8CustomElementLifecycleCallbacks> V8CustomElementLifecycleCallbacks::create(ScriptState* scriptState, v8::Handle<v8::Object> prototype, v8::Handle<v8::Function> created, v8::Handle<v8::Function> attached, v8::Handle<v8::Function> detached, v8::Handle<v8::Function> attributeChanged) 54 { 55 v8::Isolate* isolate = scriptState->isolate(); 56 // A given object can only be used as a Custom Element prototype 57 // once; see customElementIsInterfacePrototypeObject 58 #define SET_HIDDEN_VALUE(Value, Name) \ 59 ASSERT(V8HiddenValue::getHiddenValue(isolate, prototype, V8HiddenValue::customElement##Name(isolate)).IsEmpty()); \ 60 if (!Value.IsEmpty()) \ 61 V8HiddenValue::setHiddenValue(isolate, prototype, V8HiddenValue::customElement##Name(isolate), Value); 62 63 CALLBACK_LIST(SET_HIDDEN_VALUE) 64 #undef SET_HIDDEN_VALUE 65 66 return adoptRef(new V8CustomElementLifecycleCallbacks(scriptState, prototype, created, attached, detached, attributeChanged)); 67 } 68 69 static CustomElementLifecycleCallbacks::CallbackType flagSet(v8::Handle<v8::Function> attached, v8::Handle<v8::Function> detached, v8::Handle<v8::Function> attributeChanged) 70 { 71 // V8 Custom Elements always run created to swizzle prototypes. 72 int flags = CustomElementLifecycleCallbacks::Created; 73 74 if (!attached.IsEmpty()) 75 flags |= CustomElementLifecycleCallbacks::Attached; 76 77 if (!detached.IsEmpty()) 78 flags |= CustomElementLifecycleCallbacks::Detached; 79 80 if (!attributeChanged.IsEmpty()) 81 flags |= CustomElementLifecycleCallbacks::AttributeChanged; 82 83 return CustomElementLifecycleCallbacks::CallbackType(flags); 84 } 85 86 template <typename T> 87 static void weakCallback(const v8::WeakCallbackData<T, ScopedPersistent<T> >& data) 88 { 89 data.GetParameter()->clear(); 90 } 91 92 V8CustomElementLifecycleCallbacks::V8CustomElementLifecycleCallbacks(ScriptState* scriptState, v8::Handle<v8::Object> prototype, v8::Handle<v8::Function> created, v8::Handle<v8::Function> attached, v8::Handle<v8::Function> detached, v8::Handle<v8::Function> attributeChanged) 93 : CustomElementLifecycleCallbacks(flagSet(attached, detached, attributeChanged)) 94 , ContextLifecycleObserver(scriptState->executionContext()) 95 , m_owner(0) 96 , m_scriptState(scriptState) 97 , m_prototype(scriptState->isolate(), prototype) 98 , m_created(scriptState->isolate(), created) 99 , m_attached(scriptState->isolate(), attached) 100 , m_detached(scriptState->isolate(), detached) 101 , m_attributeChanged(scriptState->isolate(), attributeChanged) 102 { 103 m_prototype.setWeak(&m_prototype, weakCallback<v8::Object>); 104 105 #define MAKE_WEAK(Var, _) \ 106 if (!m_##Var.isEmpty()) \ 107 m_##Var.setWeak(&m_##Var, weakCallback<v8::Function>); 108 109 CALLBACK_LIST(MAKE_WEAK) 110 #undef MAKE_WEAK 111 } 112 113 V8PerContextData* V8CustomElementLifecycleCallbacks::creationContextData() 114 { 115 if (!executionContext()) 116 return 0; 117 118 v8::Handle<v8::Context> context = m_scriptState->context(); 119 if (context.IsEmpty()) 120 return 0; 121 122 return V8PerContextData::from(context); 123 } 124 125 V8CustomElementLifecycleCallbacks::~V8CustomElementLifecycleCallbacks() 126 { 127 if (!m_owner) 128 return; 129 130 v8::HandleScope handleScope(m_scriptState->isolate()); 131 if (V8PerContextData* perContextData = creationContextData()) 132 perContextData->clearCustomElementBinding(m_owner); 133 } 134 135 bool V8CustomElementLifecycleCallbacks::setBinding(CustomElementDefinition* owner, PassOwnPtr<CustomElementBinding> binding) 136 { 137 ASSERT(!m_owner); 138 139 V8PerContextData* perContextData = creationContextData(); 140 if (!perContextData) 141 return false; 142 143 m_owner = owner; 144 145 // Bindings retrieve the prototype when needed from per-context data. 146 perContextData->addCustomElementBinding(owner, binding); 147 148 return true; 149 } 150 151 void V8CustomElementLifecycleCallbacks::created(Element* element) 152 { 153 // FIXME: callbacks while paused should be queued up for execution to 154 // continue then be delivered in order rather than delivered immediately. 155 // Bug 329665 tracks similar behavior for other synchronous events. 156 if (!executionContext() || executionContext()->activeDOMObjectsAreStopped()) 157 return; 158 159 element->setCustomElementState(Element::Upgraded); 160 161 if (m_scriptState->contextIsEmpty()) 162 return; 163 ScriptState::Scope scope(m_scriptState.get()); 164 v8::Isolate* isolate = m_scriptState->isolate(); 165 v8::Handle<v8::Context> context = m_scriptState->context(); 166 v8::Handle<v8::Object> receiver = m_scriptState->world().domDataStore().get<V8Element>(element, isolate); 167 if (!receiver.IsEmpty()) { 168 // Swizzle the prototype of the existing wrapper. We don't need to 169 // worry about non-existent wrappers; they will get the right 170 // prototype when wrapped. 171 v8::Handle<v8::Object> prototype = m_prototype.newLocal(isolate); 172 if (prototype.IsEmpty()) 173 return; 174 receiver->SetPrototype(prototype); 175 } 176 177 v8::Handle<v8::Function> callback = m_created.newLocal(isolate); 178 if (callback.IsEmpty()) 179 return; 180 181 if (receiver.IsEmpty()) 182 receiver = toV8(element, context->Global(), isolate).As<v8::Object>(); 183 184 ASSERT(!receiver.IsEmpty()); 185 186 InspectorInstrumentation::willExecuteCustomElementCallback(element); 187 188 v8::TryCatch exceptionCatcher; 189 exceptionCatcher.SetVerbose(true); 190 ScriptController::callFunction(executionContext(), callback, receiver, 0, 0, isolate); 191 } 192 193 void V8CustomElementLifecycleCallbacks::attached(Element* element) 194 { 195 call(m_attached, element); 196 } 197 198 void V8CustomElementLifecycleCallbacks::detached(Element* element) 199 { 200 call(m_detached, element); 201 } 202 203 void V8CustomElementLifecycleCallbacks::attributeChanged(Element* element, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue) 204 { 205 // FIXME: callbacks while paused should be queued up for execution to 206 // continue then be delivered in order rather than delivered immediately. 207 // Bug 329665 tracks similar behavior for other synchronous events. 208 if (!executionContext() || executionContext()->activeDOMObjectsAreStopped()) 209 return; 210 211 if (m_scriptState->contextIsEmpty()) 212 return; 213 ScriptState::Scope scope(m_scriptState.get()); 214 v8::Isolate* isolate = m_scriptState->isolate(); 215 v8::Handle<v8::Context> context = m_scriptState->context(); 216 v8::Handle<v8::Object> receiver = toV8(element, context->Global(), isolate).As<v8::Object>(); 217 ASSERT(!receiver.IsEmpty()); 218 219 v8::Handle<v8::Function> callback = m_attributeChanged.newLocal(isolate); 220 if (callback.IsEmpty()) 221 return; 222 223 v8::Handle<v8::Value> argv[] = { 224 v8String(isolate, name), 225 oldValue.isNull() ? v8::Handle<v8::Value>(v8::Null(isolate)) : v8::Handle<v8::Value>(v8String(isolate, oldValue)), 226 newValue.isNull() ? v8::Handle<v8::Value>(v8::Null(isolate)) : v8::Handle<v8::Value>(v8String(isolate, newValue)) 227 }; 228 229 InspectorInstrumentation::willExecuteCustomElementCallback(element); 230 231 v8::TryCatch exceptionCatcher; 232 exceptionCatcher.SetVerbose(true); 233 ScriptController::callFunction(executionContext(), callback, receiver, WTF_ARRAY_LENGTH(argv), argv, isolate); 234 } 235 236 void V8CustomElementLifecycleCallbacks::call(const ScopedPersistent<v8::Function>& weakCallback, Element* element) 237 { 238 // FIXME: callbacks while paused should be queued up for execution to 239 // continue then be delivered in order rather than delivered immediately. 240 // Bug 329665 tracks similar behavior for other synchronous events. 241 if (!executionContext() || executionContext()->activeDOMObjectsAreStopped()) 242 return; 243 244 if (m_scriptState->contextIsEmpty()) 245 return; 246 ScriptState::Scope scope(m_scriptState.get()); 247 v8::Isolate* isolate = m_scriptState->isolate(); 248 v8::Handle<v8::Context> context = m_scriptState->context(); 249 v8::Handle<v8::Function> callback = weakCallback.newLocal(isolate); 250 if (callback.IsEmpty()) 251 return; 252 253 v8::Handle<v8::Object> receiver = toV8(element, context->Global(), isolate).As<v8::Object>(); 254 ASSERT(!receiver.IsEmpty()); 255 256 InspectorInstrumentation::willExecuteCustomElementCallback(element); 257 258 v8::TryCatch exceptionCatcher; 259 exceptionCatcher.SetVerbose(true); 260 ScriptController::callFunction(executionContext(), callback, receiver, 0, 0, isolate); 261 } 262 263 } // namespace WebCore 264