1 /* 2 * Copyright (C) 2008, 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 #ifndef ScriptState_h 32 #define ScriptState_h 33 34 #include "bindings/v8/ScopedPersistent.h" 35 #include "bindings/v8/V8Utilities.h" 36 #include <v8.h> 37 #include "wtf/Noncopyable.h" 38 39 namespace WebCore { 40 41 class DOMWindow; 42 class DOMWrapperWorld; 43 class Frame; 44 class ScriptExecutionContext; 45 class WorkerGlobalScope; 46 47 class ScriptState { 48 WTF_MAKE_NONCOPYABLE(ScriptState); 49 public: 50 bool hadException() { return !m_exception.isEmpty(); } 51 void setException(v8::Local<v8::Value> exception) 52 { 53 m_exception.set(m_isolate, exception); 54 } 55 v8::Local<v8::Value> exception() { return m_exception.newLocal(m_isolate); } 56 void clearException() { m_exception.clear(); } 57 58 v8::Local<v8::Context> context() const 59 { 60 return m_context.newLocal(m_isolate); 61 } 62 63 v8::Isolate* isolate() 64 { 65 return m_isolate; 66 } 67 68 DOMWindow* domWindow() const; 69 ScriptExecutionContext* scriptExecutionContext() const; 70 bool evalEnabled() const; 71 void setEvalEnabled(bool); 72 73 static ScriptState* forContext(v8::Handle<v8::Context>); 74 static ScriptState* current(); 75 76 protected: 77 ScriptState() 78 : m_isolate(v8::Isolate::GetCurrent()) 79 { 80 } 81 82 ~ScriptState(); 83 84 private: 85 friend ScriptState* mainWorldScriptState(Frame*); 86 explicit ScriptState(v8::Handle<v8::Context>); 87 88 static void makeWeakCallback(v8::Isolate*, v8::Persistent<v8::Context>*, ScriptState*); 89 90 ScopedPersistent<v8::Value> m_exception; 91 ScopedPersistent<v8::Context> m_context; 92 v8::Isolate* m_isolate; 93 }; 94 95 class EmptyScriptState : public ScriptState { 96 public: 97 EmptyScriptState() : ScriptState() { } 98 ~EmptyScriptState() { } 99 }; 100 101 class ScriptStateProtectedPtr { 102 WTF_MAKE_NONCOPYABLE(ScriptStateProtectedPtr); 103 public: 104 ScriptStateProtectedPtr() 105 : m_scriptState(0) 106 { 107 } 108 109 ScriptStateProtectedPtr(ScriptState* scriptState) 110 : m_scriptState(scriptState) 111 { 112 v8::HandleScope handleScope; 113 // Keep the context from being GC'ed. ScriptState is guaranteed to be live while the context is live. 114 m_context.set(scriptState->isolate(), scriptState->context()); 115 } 116 117 ScriptState* get() const { return m_scriptState; } 118 119 private: 120 ScriptState* m_scriptState; 121 ScopedPersistent<v8::Context> m_context; 122 }; 123 124 ScriptState* mainWorldScriptState(Frame*); 125 126 ScriptState* scriptStateFromWorkerGlobalScope(WorkerGlobalScope*); 127 128 } 129 130 #endif // ScriptState_h 131