1/* 2 * Copyright (C) 2010 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef JSMainThreadExecState_h 27#define JSMainThreadExecState_h 28 29#include "InspectorInstrumentation.h" 30#include "JSDOMBinding.h" 31#include <runtime/Completion.h> 32#include <runtime/Executable.h> 33#ifndef NDEBUG 34#include <wtf/MainThread.h> 35#endif 36 37namespace WebCore { 38 39class ScriptExecutionContext; 40 41class JSMainThreadExecState { 42 WTF_MAKE_NONCOPYABLE(JSMainThreadExecState); 43public: 44 static JSC::ExecState* currentState() 45 { 46 ASSERT(isMainThread()); 47 return s_mainThreadState; 48 }; 49 50 static JSC::JSValue call(JSC::ExecState* exec, JSC::JSValue functionObject, JSC::CallType callType, const JSC::CallData& callData, JSC::JSValue thisValue, const JSC::ArgList& args) 51 { 52 JSMainThreadExecState currentState(exec); 53 // Ensure DOM global object is unwrapped to the shell. 54 if (thisValue.isObject()) 55 thisValue = thisValue.toThisObject(exec); 56 return JSC::call(exec, functionObject, callType, callData, thisValue, args); 57 }; 58 59 static inline InspectorInstrumentationCookie instrumentFunctionCall(ScriptExecutionContext* context, JSC::CallType callType, const JSC::CallData& callData) 60 { 61 if (!InspectorInstrumentation::timelineAgentEnabled(context)) 62 return InspectorInstrumentationCookie(); 63 String resourceName; 64 int lineNumber = 1; 65 if (callType == JSC::CallTypeJS) { 66 resourceName = callData.js.functionExecutable->sourceURL(); 67 lineNumber = callData.js.functionExecutable->lineNo(); 68 } else 69 resourceName = "undefined"; 70 return InspectorInstrumentation::willCallFunction(context, resourceName, lineNumber); 71 } 72 73 static JSC::JSValue evaluate(JSC::ExecState* exec, const JSC::SourceCode& source, JSC::JSValue thisValue, JSC::JSValue* exception) 74 { 75 JSMainThreadExecState currentState(exec); 76 JSC::JSLockHolder lock(exec); 77 return JSC::evaluate(exec, source, thisValue, exception); 78 }; 79 80protected: 81 explicit JSMainThreadExecState(JSC::ExecState* exec) 82 : m_previousState(s_mainThreadState) 83 { 84 ASSERT(isMainThread()); 85 s_mainThreadState = exec; 86 }; 87 88 ~JSMainThreadExecState() 89 { 90 ASSERT(isMainThread()); 91 92 bool didExitJavaScript = s_mainThreadState && !m_previousState; 93 94 s_mainThreadState = m_previousState; 95 96 if (didExitJavaScript) 97 didLeaveScriptContext(); 98 } 99 100private: 101 static JSC::ExecState* s_mainThreadState; 102 JSC::ExecState* m_previousState; 103 104 static void didLeaveScriptContext(); 105}; 106 107// Null state prevents origin security checks. 108// Used by non-JavaScript bindings (ObjC, GObject). 109class JSMainThreadNullState : private JSMainThreadExecState { 110public: 111 explicit JSMainThreadNullState() : JSMainThreadExecState(0) {}; 112}; 113 114} // namespace WebCore 115 116#endif // JSMainThreadExecState_h 117