1 /* 2 * Copyright (C) 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 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 #ifndef TraceEvent_h 26 #define TraceEvent_h 27 28 #include "PlatformBridge.h" 29 30 // Implementation detail: trace event macros create temporary variables 31 // to keep instrumentation overhead low. These macros give each temporary 32 // variable a unique name based on the line number to prevent name collissions. 33 #define TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER3(a, b) a##b 34 #define TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER2(a, b) TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER3(a, b) 35 #define TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER(name_prefix) TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER2(name_prefix, __LINE__) 36 37 // Issues PlatformBridge::traceEventBegin and traceEventEnd calls for the enclosing scope 38 #define TRACE_EVENT(name, id, extra) WebCore::internal::ScopeTracer TRACE_EVENT_MAKE_UNIQUE_IDENTIFIER(__traceEventScope)(name, id, extra); 39 40 namespace WebCore { 41 42 namespace internal { 43 44 // Used by TRACE_EVENT macro. Do not use directly. 45 class ScopeTracer { 46 public: 47 ScopeTracer(const char* name, void*, const char* extra); 48 ~ScopeTracer(); 49 50 private: 51 const char* m_name; 52 void* m_id; 53 OwnPtr<char*> m_extra; 54 }; 55 56 inline ScopeTracer::ScopeTracer(const char* name, void* id, const char* extra) 57 : m_name(name) 58 , m_id(id) 59 { 60 PlatformBridge::traceEventBegin(name, id, extra); \ 61 if (extra) 62 m_extra = adoptPtr(strdup(extra)); 63 } 64 65 inline ScopeTracer::~ScopeTracer() 66 { 67 PlatformBridge::traceEventEnd(m_name, m_id, m_extra.get()); 68 } 69 70 } // namespace internal 71 72 } // namespace WebCore 73 74 #endif 75
