1 /* 2 * Copyright (C) 2009, 2011 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 "ScriptState.h" 33 34 #include "Frame.h" 35 #include "Node.h" 36 #include "Page.h" 37 #include "ScriptController.h" 38 #include "V8HiddenPropertyName.h" 39 40 #include "WorkerContext.h" 41 #include "WorkerContextExecutionProxy.h" 42 #include "WorkerScriptController.h" 43 44 #include <v8.h> 45 #include <wtf/Assertions.h> 46 47 namespace WebCore { 48 49 ScriptState::ScriptState(v8::Handle<v8::Context> context) 50 : m_context(v8::Persistent<v8::Context>::New(context)) 51 { 52 m_context.MakeWeak(this, &ScriptState::weakReferenceCallback); 53 } 54 55 ScriptState::~ScriptState() 56 { 57 m_context.Dispose(); 58 m_context.Clear(); 59 } 60 61 ScriptState* ScriptState::forContext(v8::Local<v8::Context> context) 62 { 63 v8::Context::Scope contextScope(context); 64 65 v8::Local<v8::Object> global = context->Global(); 66 // Skip proxy object. The proxy object will survive page navigation while we need 67 // an object whose lifetime consides with that of the inspected context. 68 global = v8::Local<v8::Object>::Cast(global->GetPrototype()); 69 70 v8::Handle<v8::String> key = V8HiddenPropertyName::scriptState(); 71 v8::Local<v8::Value> val = global->GetHiddenValue(key); 72 if (!val.IsEmpty() && val->IsExternal()) 73 return static_cast<ScriptState*>(v8::External::Cast(*val)->Value()); 74 75 ScriptState* state = new ScriptState(context); 76 global->SetHiddenValue(key, v8::External::New(state)); 77 return state; 78 } 79 80 ScriptState* ScriptState::current() 81 { 82 v8::HandleScope handleScope; 83 v8::Local<v8::Context> context = v8::Context::GetCurrent(); 84 if (context.IsEmpty()) { 85 ASSERT_NOT_REACHED(); 86 return 0; 87 } 88 return ScriptState::forContext(context); 89 } 90 91 void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter) 92 { 93 ScriptState* scriptState = static_cast<ScriptState*>(parameter); 94 delete scriptState; 95 } 96 97 ScriptState* mainWorldScriptState(Frame* frame) 98 { 99 v8::HandleScope handleScope; 100 V8Proxy* proxy = frame->script()->proxy(); 101 return ScriptState::forContext(proxy->mainWorldContext()); 102 } 103 104 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node* node) 105 { 106 // This should be never reached with V8 bindings (WebKit only uses it 107 // for non-JS bindings) 108 ASSERT_NOT_REACHED(); 109 return 0; 110 } 111 112 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page* page) 113 { 114 // This should be only reached with V8 bindings from single process layout tests. 115 return mainWorldScriptState(page->mainFrame()); 116 } 117 118 #if ENABLE(WORKERS) 119 ScriptState* scriptStateFromWorkerContext(WorkerContext* workerContext) 120 { 121 WorkerContextExecutionProxy* proxy = workerContext->script()->proxy(); 122 if (!proxy) 123 return 0; 124 125 v8::HandleScope handleScope; 126 v8::Local<v8::Context> context = proxy->context(); 127 return ScriptState::forContext(context); 128 } 129 #endif 130 131 } 132