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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 
ScopeTracer(const char * name,void * id,const char * extra)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 
~ScopeTracer()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