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Side by Side Diff: base/debug/trace_event_win.h

Issue 23934003: Have all trace points emit to ETW. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 7 years, 3 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // This file contains the Windows-specific declarations for trace_event.h. 5 // This file contains the Windows-specific declarations for trace_event.h.
6 #ifndef BASE_DEBUG_TRACE_EVENT_WIN_H_ 6 #ifndef BASE_DEBUG_TRACE_EVENT_WIN_H_
7 #define BASE_DEBUG_TRACE_EVENT_WIN_H_ 7 #define BASE_DEBUG_TRACE_EVENT_WIN_H_
8 8
9 #include <string> 9 #include <string>
10 10
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30 // Trace begin/end/instant events, this is the bottleneck implementation 30 // Trace begin/end/instant events, this is the bottleneck implementation
31 // all the others defer to. 31 // all the others defer to.
32 // Allowing the use of std::string for name or extra is a convenience, 32 // Allowing the use of std::string for name or extra is a convenience,
33 // whereas passing name or extra as a const char* avoids the construction 33 // whereas passing name or extra as a const char* avoids the construction
34 // of temporary std::string instances. 34 // of temporary std::string instances.
35 // If -1 is passed for name_len or extra_len, the strlen of the string will 35 // If -1 is passed for name_len or extra_len, the strlen of the string will
36 // be used for length. 36 // be used for length.
37 static void Trace(const char* name, 37 static void Trace(const char* name,
38 size_t name_len, 38 size_t name_len,
39 char type, 39 char type,
40 const void* id, 40 unsigned long long id,
41 const char* extra, 41 const char* extra,
42 size_t extra_len); 42 size_t extra_len);
43 43
44 // Allows passing extra as a std::string for convenience. 44 // Allows passing extra as a std::string for convenience.
45 static void Trace(const char* name, 45 static void Trace(const char* name,
46 char type, 46 char type,
47 const void* id, 47 unsigned long long id,
48 const std::string& extra) { 48 const std::string& extra) {
49 return Trace(name, -1, type, id, extra.c_str(), extra.length()); 49 return Trace(name, -1, type, id, extra.c_str(), extra.length());
50 } 50 }
51 51
52 // Allows passing extra as a const char* to avoid constructing temporary 52 // Allows passing extra as a const char* to avoid constructing temporary
53 // std::string instances where not needed. 53 // std::string instances where not needed.
54 static void Trace(const char* name, 54 static void Trace(const char* name,
55 char type, 55 char type,
56 const void* id, 56 unsigned long long id,
57 const char* extra) { 57 const char* extra) {
58 return Trace(name, -1, type, id, extra, -1); 58 return Trace(name, -1, type, id, extra, -1);
59 } 59 }
60 60
61 // Retrieves the singleton. 61 // Retrieves the singleton.
62 // Note that this may return NULL post-AtExit processing. 62 // Note that this may return NULL post-AtExit processing.
63 static TraceEventETWProvider* GetInstance(); 63 static TraceEventETWProvider* GetInstance();
64 64
65 // Returns true iff tracing is turned on. 65 // Returns true iff tracing is turned on.
66 bool IsTracing() { 66 bool IsTracing() {
67 return enable_level() >= TRACE_LEVEL_INFORMATION; 67 return enable_level() >= TRACE_LEVEL_INFORMATION;
68 } 68 }
69 69
70 // Emit a trace of type |type| containing |name|, |id|, and |extra|. 70 // Emit a trace of type |type| containing |name|, |id|, and |extra|.
71 // Note: |name| and |extra| must be NULL, or a zero-terminated string of 71 // Note: |name| and |extra| must be NULL, or a zero-terminated string of
72 // length |name_len| or |extra_len| respectively. 72 // length |name_len| or |extra_len| respectively.
73 // Note: if name_len or extra_len are -1, the length of the corresponding 73 // Note: if name_len or extra_len are -1, the length of the corresponding
74 // string will be used. 74 // string will be used.
75 void TraceEvent(const char* name, 75 void TraceEvent(const char* name,
76 size_t name_len, 76 size_t name_len,
77 char type, 77 char type,
78 const void* id, 78 unsigned long long id,
79 const char* extra, 79 const char* extra,
80 size_t extra_len); 80 size_t extra_len);
81 81
82 // Exposed for unittesting only, allows resurrecting our 82 // Exposed for unittesting only, allows resurrecting our
83 // singleton instance post-AtExit processing. 83 // singleton instance post-AtExit processing.
84 static void Resurrect(); 84 static void Resurrect();
85 85
86 private: 86 private:
87 // Ensure only the provider can construct us. 87 // Ensure only the provider can construct us.
88 friend struct StaticMemorySingletonTraits<TraceEventETWProvider>; 88 friend struct StaticMemorySingletonTraits<TraceEventETWProvider>;
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114 // The "name" string as a zero-terminated ASCII string. 114 // The "name" string as a zero-terminated ASCII string.
115 // The id pointer in the machine bitness. 115 // The id pointer in the machine bitness.
116 // The "extra" string as a zero-terminated ASCII string. 116 // The "extra" string as a zero-terminated ASCII string.
117 // Optionally the stack trace, consisting of a DWORD "depth", followed 117 // Optionally the stack trace, consisting of a DWORD "depth", followed
118 // by an array of void* (machine bitness) of length "depth". 118 // by an array of void* (machine bitness) of length "depth".
119 119
120 } // namespace debug 120 } // namespace debug
121 } // namespace base 121 } // namespace base
122 122
123 #endif // BASE_DEBUG_TRACE_EVENT_WIN_H_ 123 #endif // BASE_DEBUG_TRACE_EVENT_WIN_H_
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