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