302 lines
8.7 KiB
C++
302 lines
8.7 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "base/logging.h"
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#include <iostream>
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#include <limits>
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#include <sstream>
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#include <string>
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#include <vector>
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#include "base/strings.h"
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#include "cutils/threads.h"
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// Headers for LogMessage::LogLine.
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#ifdef __ANDROID__
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#include <android/set_abort_message.h>
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#include "cutils/log.h"
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#else
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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namespace android {
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namespace base {
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static std::mutex logging_lock;
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static LogSeverity gMinimumLogSeverity = INFO;
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static std::unique_ptr<std::string> gCmdLine;
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static std::unique_ptr<std::string> gProgramInvocationName;
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static std::unique_ptr<std::string> gProgramInvocationShortName;
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const char* GetCmdLine() {
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return (gCmdLine.get() != nullptr) ? gCmdLine->c_str() : nullptr;
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}
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const char* ProgramInvocationName() {
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return (gProgramInvocationName.get() != nullptr)
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? gProgramInvocationName->c_str()
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: "unknown";
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}
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const char* ProgramInvocationShortName() {
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return (gProgramInvocationShortName.get() != nullptr)
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? gProgramInvocationShortName->c_str()
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: "unknown";
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}
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void InitLogging(char* argv[]) {
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if (gCmdLine.get() != nullptr) {
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return;
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}
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// Stash the command line for later use. We can use /proc/self/cmdline on
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// Linux to recover this, but we don't have that luxury on the Mac, and there
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// are a couple of argv[0] variants that are commonly used.
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if (argv != nullptr) {
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gCmdLine.reset(new std::string(argv[0]));
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for (size_t i = 1; argv[i] != nullptr; ++i) {
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gCmdLine->append(" ");
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gCmdLine->append(argv[i]);
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}
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gProgramInvocationName.reset(new std::string(argv[0]));
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const char* last_slash = strrchr(argv[0], '/');
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gProgramInvocationShortName.reset(
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new std::string((last_slash != nullptr) ? last_slash + 1 : argv[0]));
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} else {
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// TODO: fall back to /proc/self/cmdline when argv is NULL on Linux.
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gCmdLine.reset(new std::string("<unset>"));
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}
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const char* tags = getenv("ANDROID_LOG_TAGS");
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if (tags == nullptr) {
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return;
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}
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std::vector<std::string> specs = Split(tags, " ");
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for (size_t i = 0; i < specs.size(); ++i) {
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// "tag-pattern:[vdiwefs]"
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std::string spec(specs[i]);
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if (spec.size() == 3 && StartsWith(spec, "*:")) {
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switch (spec[2]) {
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case 'v':
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gMinimumLogSeverity = VERBOSE;
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continue;
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case 'd':
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gMinimumLogSeverity = DEBUG;
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continue;
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case 'i':
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gMinimumLogSeverity = INFO;
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continue;
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case 'w':
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gMinimumLogSeverity = WARNING;
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continue;
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case 'e':
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gMinimumLogSeverity = ERROR;
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continue;
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case 'f':
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gMinimumLogSeverity = FATAL;
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continue;
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// liblog will even suppress FATAL if you say 's' for silent, but that's
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// crazy!
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case 's':
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gMinimumLogSeverity = FATAL;
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continue;
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}
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}
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LOG(FATAL) << "unsupported '" << spec << "' in ANDROID_LOG_TAGS (" << tags
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<< ")";
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}
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}
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// This indirection greatly reduces the stack impact of having lots of
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// checks/logging in a function.
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class LogMessageData {
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public:
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LogMessageData(const char* file, unsigned int line, LogSeverity severity,
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int error)
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: file_(file), line_number_(line), severity_(severity), error_(error) {
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const char* last_slash = strrchr(file, '/');
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file = (last_slash == nullptr) ? file : last_slash + 1;
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}
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const char* GetFile() const {
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return file_;
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}
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unsigned int GetLineNumber() const {
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return line_number_;
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}
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LogSeverity GetSeverity() const {
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return severity_;
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}
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int GetError() const {
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return error_;
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}
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std::ostream& GetBuffer() {
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return buffer_;
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}
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std::string ToString() const {
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return buffer_.str();
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}
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private:
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std::ostringstream buffer_;
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const char* const file_;
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const unsigned int line_number_;
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const LogSeverity severity_;
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const int error_;
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DISALLOW_COPY_AND_ASSIGN(LogMessageData);
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};
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LogMessage::LogMessage(const char* file, unsigned int line,
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LogSeverity severity, int error)
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: data_(new LogMessageData(file, line, severity, error)) {
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}
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LogMessage::~LogMessage() {
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if (data_->GetSeverity() < gMinimumLogSeverity) {
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return; // No need to format something we're not going to output.
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}
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// Finish constructing the message.
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if (data_->GetError() != -1) {
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data_->GetBuffer() << ": " << strerror(data_->GetError());
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}
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std::string msg(data_->ToString());
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// Do the actual logging with the lock held.
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{
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std::lock_guard<std::mutex> lock(logging_lock);
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if (msg.find('\n') == std::string::npos) {
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LogLine(data_->GetFile(), data_->GetLineNumber(), data_->GetSeverity(),
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msg.c_str());
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} else {
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msg += '\n';
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size_t i = 0;
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while (i < msg.size()) {
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size_t nl = msg.find('\n', i);
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msg[nl] = '\0';
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LogLine(data_->GetFile(), data_->GetLineNumber(), data_->GetSeverity(),
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&msg[i]);
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i = nl + 1;
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}
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}
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}
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// Abort if necessary.
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if (data_->GetSeverity() == FATAL) {
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#ifdef __ANDROID__
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android_set_abort_message(msg.c_str());
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#endif
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abort();
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}
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}
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std::ostream& LogMessage::stream() {
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return data_->GetBuffer();
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}
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#ifdef __ANDROID__
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static const android_LogPriority kLogSeverityToAndroidLogPriority[] = {
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ANDROID_LOG_VERBOSE, ANDROID_LOG_DEBUG, ANDROID_LOG_INFO,
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ANDROID_LOG_WARN, ANDROID_LOG_ERROR, ANDROID_LOG_FATAL};
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static_assert(arraysize(kLogSeverityToAndroidLogPriority) == FATAL + 1,
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"Mismatch in size of kLogSeverityToAndroidLogPriority and values "
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"in LogSeverity");
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#endif
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void LogMessage::LogLine(const char* file, unsigned int line,
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LogSeverity log_severity, const char* message) {
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#ifdef __ANDROID__
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const char* tag = ProgramInvocationShortName();
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int priority = kLogSeverityToAndroidLogPriority[log_severity];
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if (priority == ANDROID_LOG_FATAL) {
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LOG_PRI(priority, tag, "%s:%u] %s", file, line, message);
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} else {
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LOG_PRI(priority, tag, "%s", message);
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}
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#else
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static const char* log_characters = "VDIWEF";
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CHECK_EQ(strlen(log_characters), FATAL + 1U);
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char severity = log_characters[log_severity];
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fprintf(stderr, "%s %c %5d %5d %s:%u] %s\n", ProgramInvocationShortName(),
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severity, getpid(), gettid(), file, line, message);
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#endif
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}
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void LogMessage::LogLineLowStack(const char* file, unsigned int line,
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LogSeverity log_severity, const char* message) {
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#ifdef __ANDROID__
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// Use android_writeLog() to avoid stack-based buffers used by
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// android_printLog().
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const char* tag = ProgramInvocationShortName();
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int priority = kLogSeverityToAndroidLogPriority[log_severity];
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char* buf = nullptr;
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size_t buf_size = 0u;
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if (priority == ANDROID_LOG_FATAL) {
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// Allocate buffer for snprintf(buf, buf_size, "%s:%u] %s", file, line,
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// message) below. If allocation fails, fall back to printing only the
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// message.
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buf_size = strlen(file) + 1 /* ':' */ +
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std::numeric_limits<typeof(line)>::max_digits10 + 2 /* "] " */ +
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strlen(message) + 1 /* terminating 0 */;
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buf = reinterpret_cast<char*>(malloc(buf_size));
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}
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if (buf != nullptr) {
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snprintf(buf, buf_size, "%s:%u] %s", file, line, message);
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android_writeLog(priority, tag, buf);
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free(buf);
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} else {
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android_writeLog(priority, tag, message);
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}
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#else
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static const char* log_characters = "VDIWEF";
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CHECK_EQ(strlen(log_characters), FATAL + 1U);
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const char* program_name = ProgramInvocationShortName();
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write(STDERR_FILENO, program_name, strlen(program_name));
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write(STDERR_FILENO, " ", 1);
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write(STDERR_FILENO, &log_characters[log_severity], 1);
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write(STDERR_FILENO, " ", 1);
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// TODO: pid and tid.
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write(STDERR_FILENO, file, strlen(file));
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// TODO: line.
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UNUSED(line);
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write(STDERR_FILENO, "] ", 2);
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write(STDERR_FILENO, message, strlen(message));
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write(STDERR_FILENO, "\n", 1);
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#endif
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}
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ScopedLogSeverity::ScopedLogSeverity(LogSeverity level) {
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old_ = gMinimumLogSeverity;
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gMinimumLogSeverity = level;
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}
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ScopedLogSeverity::~ScopedLogSeverity() {
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gMinimumLogSeverity = old_;
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}
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} // namespace base
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} // namespace android
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