1 /* 2 * Copyright (C) 2006, 2007, 2008, 2009 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 V8Utilities_h 32 #define V8Utilities_h 33 34 #include <v8.h> 35 36 namespace WebCore { 37 38 class EventListener; 39 class Frame; 40 class KURL; 41 class ScriptExecutionContext; 42 class ScriptState; 43 class String; 44 45 // Use an array to hold dependents. It works like a ref-counted scheme. A value can be added more than once to the DOM object. 46 void createHiddenDependency(v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex); 47 void removeHiddenDependency(v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex); 48 49 // Combo create/remove, for generated event-handler-setter bindings: 50 void transferHiddenDependency(v8::Handle<v8::Object>, EventListener* oldValue, v8::Local<v8::Value> newValue, int cacheIndex); 51 52 bool processingUserGesture(); 53 bool shouldAllowNavigation(Frame*); 54 KURL completeURL(const String& relativeURL); 55 void navigateIfAllowed(Frame*, const KURL&, bool lockHistory, bool lockBackForwardList); 56 57 ScriptExecutionContext* getScriptExecutionContext(ScriptState*); getScriptExecutionContext()58 inline ScriptExecutionContext* getScriptExecutionContext() { 59 return getScriptExecutionContext(0); 60 } 61 62 void reportException(ScriptState*, v8::TryCatch&); 63 64 class AllowAllocation { 65 public: AllowAllocation()66 inline AllowAllocation() 67 { 68 m_previous = m_current; 69 m_current = true; 70 } 71 ~AllowAllocation()72 inline ~AllowAllocation() 73 { 74 m_current = m_previous; 75 } 76 77 static bool m_current; 78 79 private: 80 bool m_previous; 81 }; 82 83 class SafeAllocation { 84 public: 85 static inline v8::Local<v8::Object> newInstance(v8::Handle<v8::Function>); 86 static inline v8::Local<v8::Object> newInstance(v8::Handle<v8::ObjectTemplate>); 87 static inline v8::Local<v8::Object> newInstance(v8::Handle<v8::Function>, int argc, v8::Handle<v8::Value> argv[]); 88 }; 89 newInstance(v8::Handle<v8::Function> function)90 v8::Local<v8::Object> SafeAllocation::newInstance(v8::Handle<v8::Function> function) 91 { 92 if (function.IsEmpty()) 93 return v8::Local<v8::Object>(); 94 AllowAllocation allow; 95 return function->NewInstance(); 96 } 97 newInstance(v8::Handle<v8::ObjectTemplate> objectTemplate)98 v8::Local<v8::Object> SafeAllocation::newInstance(v8::Handle<v8::ObjectTemplate> objectTemplate) 99 { 100 if (objectTemplate.IsEmpty()) 101 return v8::Local<v8::Object>(); 102 AllowAllocation allow; 103 return objectTemplate->NewInstance(); 104 } 105 newInstance(v8::Handle<v8::Function> function,int argc,v8::Handle<v8::Value> argv[])106 v8::Local<v8::Object> SafeAllocation::newInstance(v8::Handle<v8::Function> function, int argc, v8::Handle<v8::Value> argv[]) 107 { 108 if (function.IsEmpty()) 109 return v8::Local<v8::Object>(); 110 AllowAllocation allow; 111 return function->NewInstance(argc, argv); 112 } 113 114 } // namespace WebCore 115 116 #endif // V8Utilities_h 117