logging_win.cc revision c407dc5cd9bdc5668497f21b26b09d988ab439de 
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/atomicops.h"
7#include "base/singleton.h"
8#include <initguid.h>  // NOLINT
9
10namespace {
11
12typedef StaticMemorySingletonTraits<logging::LogEventProvider>
13    LogEventSingletonTraits;
14Singleton<logging::LogEventProvider, LogEventSingletonTraits> log_provider;
15
16}  // namespace
17
18namespace logging {
19
20DEFINE_GUID(kLogEventId,
21    0x7fe69228, 0x633e, 0x4f06, 0x80, 0xc1, 0x52, 0x7f, 0xea, 0x23, 0xe3, 0xa7);
22
23LogEventProvider::LogEventProvider() : old_log_level_(LOG_NONE) {
24}
25
26bool LogEventProvider::LogMessage(int severity, const std::string& message) {
27  EtwEventLevel level = TRACE_LEVEL_NONE;
28
29  // Convert the log severity to the most appropriate ETW trace level.
30  switch (severity) {
31    case LOG_INFO:
32      level = TRACE_LEVEL_INFORMATION;
33      break;
34    case LOG_WARNING:
35      level = TRACE_LEVEL_WARNING;
36      break;
37    case LOG_ERROR:
38    case LOG_ERROR_REPORT:
39      level = TRACE_LEVEL_ERROR;
40      break;
41    case LOG_FATAL:
42      level = TRACE_LEVEL_FATAL;
43      break;
44  };
45
46  // Bail if we're not logging, not at that level,
47  // or if we're post-atexit handling.
48  LogEventProvider* provider = log_provider.get();
49  if (provider == NULL || level > provider->enable_level())
50    return false;
51
52  // And now log the event, with stack trace if one is
53  // requested per our enable flags.
54  if (provider->enable_flags() & ENABLE_STACK_TRACE_CAPTURE) {
55    const size_t kMaxBacktraceDepth = 32;
56    void* backtrace[kMaxBacktraceDepth];
57    DWORD depth = CaptureStackBackTrace(2, kMaxBacktraceDepth, backtrace, NULL);
58    EtwMofEvent<3> event(kLogEventId, LOG_MESSAGE_WITH_STACKTRACE, level);
59
60    event.SetField(0, sizeof(depth), &depth);
61    event.SetField(1, sizeof(backtrace[0]) * depth, &backtrace);
62    event.SetField(2, message.length() + 1, message.c_str());
63
64    provider->Log(event.get());
65  } else {
66    EtwMofEvent<1> event(kLogEventId, LOG_MESSAGE, level);
67    event.SetField(0, message.length() + 1, message.c_str());
68    provider->Log(event.get());
69  }
70
71  // Don't increase verbosity in other log destinations.
72  if (severity >= provider->old_log_level_)
73    return true;
74
75  return false;
76}
77
78void LogEventProvider::Initialize(const GUID& provider_name) {
79  LogEventProvider* provider = log_provider.get();
80
81  provider->set_provider_name(provider_name);
82  provider->Register();
83
84  // Register our message handler with logging.
85  SetLogMessageHandler(LogMessage);
86}
87
88void LogEventProvider::Uninitialize() {
89  log_provider.get()->Unregister();
90}
91
92void LogEventProvider::OnEventsEnabled() {
93  // Grab the old log level so we can restore it later.
94  old_log_level_ = GetMinLogLevel();
95
96  // Convert the new trace level to a logging severity
97  // and enable logging at that level.
98  EtwEventLevel level = enable_level();
99  switch (level) {
100    case TRACE_LEVEL_NONE:
101    case TRACE_LEVEL_FATAL:
102      SetMinLogLevel(LOG_FATAL);
103      break;
104    case TRACE_LEVEL_ERROR:
105      SetMinLogLevel(LOG_ERROR);
106      break;
107    case TRACE_LEVEL_WARNING:
108      SetMinLogLevel(LOG_WARNING);
109      break;
110    case TRACE_LEVEL_INFORMATION:
111    case TRACE_LEVEL_VERBOSE:
112      SetMinLogLevel(LOG_INFO);
113      break;
114  }
115}
116
117void LogEventProvider::OnEventsDisabled() {
118  // Restore the old log level.
119  SetMinLogLevel(old_log_level_);
120}
121
122}  // namespace logging
123