140 lines
4.2 KiB
C++
140 lines
4.2 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/logging_win.h"
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#include "base/memory/singleton.h"
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#include <initguid.h> // NOLINT
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namespace logging {
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using base::win::EtwEventLevel;
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using base::win::EtwMofEvent;
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DEFINE_GUID(kLogEventId,
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0x7fe69228, 0x633e, 0x4f06, 0x80, 0xc1, 0x52, 0x7f, 0xea, 0x23, 0xe3, 0xa7);
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LogEventProvider::LogEventProvider() : old_log_level_(LOG_NONE) {
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}
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LogEventProvider* LogEventProvider::GetInstance() {
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return Singleton<LogEventProvider,
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StaticMemorySingletonTraits<LogEventProvider> >::get();
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}
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bool LogEventProvider::LogMessage(logging::LogSeverity severity,
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const char* file, int line, size_t message_start,
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const std::string& message) {
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EtwEventLevel level = TRACE_LEVEL_NONE;
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// Convert the log severity to the most appropriate ETW trace level.
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if (severity >= 0) {
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switch (severity) {
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case LOG_INFO:
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level = TRACE_LEVEL_INFORMATION;
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break;
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case LOG_WARNING:
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level = TRACE_LEVEL_WARNING;
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break;
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case LOG_ERROR:
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case LOG_ERROR_REPORT:
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level = TRACE_LEVEL_ERROR;
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break;
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case LOG_FATAL:
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level = TRACE_LEVEL_FATAL;
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break;
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}
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} else { // severity < 0 is VLOG verbosity levels.
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level = TRACE_LEVEL_INFORMATION - severity;
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}
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// Bail if we're not logging, not at that level,
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// or if we're post-atexit handling.
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LogEventProvider* provider = LogEventProvider::GetInstance();
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if (provider == NULL || level > provider->enable_level())
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return false;
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// And now log the event.
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if (provider->enable_flags() & ENABLE_LOG_MESSAGE_ONLY) {
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EtwMofEvent<1> event(kLogEventId, LOG_MESSAGE, level);
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event.SetField(0, message.length() + 1 - message_start,
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message.c_str() + message_start);
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provider->Log(event.get());
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} else {
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const size_t kMaxBacktraceDepth = 32;
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void* backtrace[kMaxBacktraceDepth];
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DWORD depth = 0;
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// Capture a stack trace if one is requested.
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// requested per our enable flags.
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if (provider->enable_flags() & ENABLE_STACK_TRACE_CAPTURE)
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depth = CaptureStackBackTrace(2, kMaxBacktraceDepth, backtrace, NULL);
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EtwMofEvent<5> event(kLogEventId, LOG_MESSAGE_FULL, level);
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if (file == NULL)
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file = "";
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// Add the stack trace.
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event.SetField(0, sizeof(depth), &depth);
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event.SetField(1, sizeof(backtrace[0]) * depth, &backtrace);
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// The line.
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event.SetField(2, sizeof(line), &line);
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// The file.
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event.SetField(3, strlen(file) + 1, file);
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// And finally the message.
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event.SetField(4, message.length() + 1 - message_start,
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message.c_str() + message_start);
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provider->Log(event.get());
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}
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// Don't increase verbosity in other log destinations.
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if (severity < provider->old_log_level_)
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return true;
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return false;
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}
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void LogEventProvider::Initialize(const GUID& provider_name) {
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LogEventProvider* provider = LogEventProvider::GetInstance();
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provider->set_provider_name(provider_name);
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provider->Register();
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// Register our message handler with logging.
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SetLogMessageHandler(LogMessage);
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}
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void LogEventProvider::Uninitialize() {
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LogEventProvider::GetInstance()->Unregister();
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}
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void LogEventProvider::OnEventsEnabled() {
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// Grab the old log level so we can restore it later.
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old_log_level_ = GetMinLogLevel();
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// Convert the new trace level to a logging severity
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// and enable logging at that level.
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EtwEventLevel level = enable_level();
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if (level == TRACE_LEVEL_NONE || level == TRACE_LEVEL_FATAL) {
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SetMinLogLevel(LOG_FATAL);
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} else if (level == TRACE_LEVEL_ERROR) {
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SetMinLogLevel(LOG_ERROR);
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} else if (level == TRACE_LEVEL_WARNING) {
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SetMinLogLevel(LOG_WARNING);
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} else if (level == TRACE_LEVEL_INFORMATION) {
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SetMinLogLevel(LOG_INFO);
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} else if (level >= TRACE_LEVEL_VERBOSE) {
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// Above INFO, we enable verbose levels with negative severities.
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SetMinLogLevel(TRACE_LEVEL_INFORMATION - level);
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}
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}
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void LogEventProvider::OnEventsDisabled() {
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// Restore the old log level.
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SetMinLogLevel(old_log_level_);
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}
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} // namespace logging
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