logging_win.cc revision 3345a6884c488ff3a535c2c9acdd33d74b37e311 
1// Copyright (c) 2009 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/logging_win.h"
6#include "base/singleton.h"
7#include <initguid.h>  // NOLINT
8
9namespace {
10
11typedef StaticMemorySingletonTraits<logging::LogEventProvider>
12    LogEventSingletonTraits;
13Singleton<logging::LogEventProvider, LogEventSingletonTraits> log_provider;
14
15}  // namespace
16
17namespace logging {
18
19DEFINE_GUID(kLogEventId,
20    0x7fe69228, 0x633e, 0x4f06, 0x80, 0xc1, 0x52, 0x7f, 0xea, 0x23, 0xe3, 0xa7);
21
22LogEventProvider::LogEventProvider() : old_log_level_(LOG_NONE) {
23}
24
25bool LogEventProvider::LogMessage(int severity, const std::string& message) {
26  EtwEventLevel level = TRACE_LEVEL_NONE;
27
28  // Convert the log severity to the most appropriate ETW trace level.
29  switch (severity) {
30    case LOG_INFO:
31      level = TRACE_LEVEL_INFORMATION;
32      break;
33    case LOG_WARNING:
34      level = TRACE_LEVEL_WARNING;
35      break;
36    case LOG_ERROR:
37    case LOG_ERROR_REPORT:
38      level = TRACE_LEVEL_ERROR;
39      break;
40    case LOG_FATAL:
41      level = TRACE_LEVEL_FATAL;
42      break;
43  };
44
45  // Bail if we're not logging, not at that level,
46  // or if we're post-atexit handling.
47  LogEventProvider* provider = log_provider.get();
48  if (provider == NULL || level > provider->enable_level())
49    return false;
50
51  // And now log the event, with stack trace if one is
52  // requested per our enable flags.
53  if (provider->enable_flags() & ENABLE_STACK_TRACE_CAPTURE) {
54    const size_t kMaxBacktraceDepth = 32;
55    void* backtrace[kMaxBacktraceDepth];
56    DWORD depth = CaptureStackBackTrace(2, kMaxBacktraceDepth, backtrace, NULL);
57    EtwMofEvent<3> event(kLogEventId, LOG_MESSAGE_WITH_STACKTRACE, level);
58
59    event.SetField(0, sizeof(depth), &depth);
60    event.SetField(1, sizeof(backtrace[0]) * depth, &backtrace);
61    event.SetField(2, message.length() + 1, message.c_str());
62
63    provider->Log(event.get());
64  } else {
65    EtwMofEvent<1> event(kLogEventId, LOG_MESSAGE, level);
66    event.SetField(0, message.length() + 1, message.c_str());
67    provider->Log(event.get());
68  }
69
70  // Don't increase verbosity in other log destinations.
71  if (severity >= provider->old_log_level_)
72    return true;
73
74  return false;
75}
76
77void LogEventProvider::Initialize(const GUID& provider_name) {
78  LogEventProvider* provider = log_provider.get();
79
80  provider->set_provider_name(provider_name);
81  provider->Register();
82
83  // Register our message handler with logging.
84  SetLogMessageHandler(LogMessage);
85}
86
87void LogEventProvider::Uninitialize() {
88  log_provider.get()->Unregister();
89}
90
91void LogEventProvider::OnEventsEnabled() {
92  // Grab the old log level so we can restore it later.
93  old_log_level_ = GetMinLogLevel();
94
95  // Convert the new trace level to a logging severity
96  // and enable logging at that level.
97  EtwEventLevel level = enable_level();
98  switch (level) {
99    case TRACE_LEVEL_NONE:
100    case TRACE_LEVEL_FATAL:
101      SetMinLogLevel(LOG_FATAL);
102      break;
103    case TRACE_LEVEL_ERROR:
104      SetMinLogLevel(LOG_ERROR);
105      break;
106    case TRACE_LEVEL_WARNING:
107      SetMinLogLevel(LOG_WARNING);
108      break;
109    case TRACE_LEVEL_INFORMATION:
110    case TRACE_LEVEL_VERBOSE:
111      SetMinLogLevel(LOG_INFO);
112      break;
113  }
114}
115
116void LogEventProvider::OnEventsDisabled() {
117  // Restore the old log level.
118  SetMinLogLevel(old_log_level_);
119}
120
121}  // namespace logging
122