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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "logging.h"
#include <cstring>
#include <iostream>
#include <limits>
#include <sstream>
#include "aborting.h"
#include "os.h"
#include "unix_file/fd_file.h"
// Headers for LogMessage::LogLine.
#ifdef ART_TARGET_ANDROID
#include <log/log.h>
#else
#include <sys/types.h>
#include <unistd.h>
#endif
namespace art {
LogVerbosity gLogVerbosity;
std::atomic<unsigned int> gAborting(0);
static std::unique_ptr<std::string> gCmdLine;
static std::unique_ptr<std::string> gProgramInvocationName;
static std::unique_ptr<std::string> gProgramInvocationShortName;
const char* GetCmdLine() {
return (gCmdLine.get() != nullptr) ? gCmdLine->c_str() : nullptr;
}
const char* ProgramInvocationName() {
return (gProgramInvocationName.get() != nullptr) ? gProgramInvocationName->c_str() : "art";
}
const char* ProgramInvocationShortName() {
return (gProgramInvocationShortName.get() != nullptr) ? gProgramInvocationShortName->c_str()
: "art";
}
void InitLogging(char* argv[], AbortFunction& abort_function) {
if (gCmdLine.get() != nullptr) {
return;
}
// Stash the command line for later use. We can use /proc/self/cmdline on Linux to recover this,
// but we don't have that luxury on the Mac, and there are a couple of argv[0] variants that are
// commonly used.
if (argv != nullptr) {
gCmdLine.reset(new std::string(argv[0]));
for (size_t i = 1; argv[i] != nullptr; ++i) {
gCmdLine->append(" ");
gCmdLine->append(argv[i]);
}
gProgramInvocationName.reset(new std::string(argv[0]));
const char* last_slash = strrchr(argv[0], '/');
gProgramInvocationShortName.reset(new std::string((last_slash != nullptr) ? last_slash + 1
: argv[0]));
} else {
// TODO: fall back to /proc/self/cmdline when argv is null on Linux.
gCmdLine.reset(new std::string("<unset>"));
}
#ifdef ART_TARGET_ANDROID
#define INIT_LOGGING_DEFAULT_LOGGER android::base::LogdLogger()
#else
#define INIT_LOGGING_DEFAULT_LOGGER android::base::StderrLogger
#endif
android::base::InitLogging(argv, INIT_LOGGING_DEFAULT_LOGGER,
std::move<AbortFunction>(abort_function));
#undef INIT_LOGGING_DEFAULT_LOGGER
}
#ifdef ART_TARGET_ANDROID
static const android_LogPriority kLogSeverityToAndroidLogPriority[] = {
ANDROID_LOG_VERBOSE, ANDROID_LOG_DEBUG, ANDROID_LOG_INFO, ANDROID_LOG_WARN,
ANDROID_LOG_ERROR, ANDROID_LOG_FATAL, ANDROID_LOG_FATAL
};
static_assert(arraysize(kLogSeverityToAndroidLogPriority) == ::android::base::FATAL + 1,
"Mismatch in size of kLogSeverityToAndroidLogPriority and values in LogSeverity");
#endif
void LogHelper::LogLineLowStack(const char* file,
unsigned int line,
LogSeverity log_severity,
const char* message) {
#ifdef ART_TARGET_ANDROID
// Use android_writeLog() to avoid stack-based buffers used by android_printLog().
const char* tag = ProgramInvocationShortName();
int priority = kLogSeverityToAndroidLogPriority[static_cast<size_t>(log_severity)];
char* buf = nullptr;
size_t buf_size = 0u;
if (priority == ANDROID_LOG_FATAL) {
// Allocate buffer for snprintf(buf, buf_size, "%s:%u] %s", file, line, message) below.
// If allocation fails, fall back to printing only the message.
buf_size = strlen(file) + 1 /* ':' */ + std::numeric_limits<decltype(line)>::max_digits10 +
2 /* "] " */ + strlen(message) + 1 /* terminating 0 */;
buf = reinterpret_cast<char*>(malloc(buf_size));
}
if (buf != nullptr) {
snprintf(buf, buf_size, "%s:%u] %s", file, line, message);
android_writeLog(priority, tag, buf);
free(buf);
} else {
android_writeLog(priority, tag, message);
}
#else
static constexpr char kLogCharacters[] = { 'V', 'D', 'I', 'W', 'E', 'F', 'F' };
static_assert(
arraysize(kLogCharacters) == static_cast<size_t>(::android::base::FATAL) + 1,
"Wrong character array size");
const char* program_name = ProgramInvocationShortName();
TEMP_FAILURE_RETRY(write(STDERR_FILENO, program_name, strlen(program_name)));
TEMP_FAILURE_RETRY(write(STDERR_FILENO, " ", 1));
TEMP_FAILURE_RETRY(write(STDERR_FILENO, &kLogCharacters[static_cast<size_t>(log_severity)], 1));
TEMP_FAILURE_RETRY(write(STDERR_FILENO, " ", 1));
// TODO: pid and tid.
TEMP_FAILURE_RETRY(write(STDERR_FILENO, file, strlen(file)));
// TODO: line.
UNUSED(line);
TEMP_FAILURE_RETRY(write(STDERR_FILENO, "] ", 2));
TEMP_FAILURE_RETRY(write(STDERR_FILENO, message, strlen(message)));
TEMP_FAILURE_RETRY(write(STDERR_FILENO, "\n", 1));
#endif // ART_TARGET_ANDROID
}
bool PrintFileToLog(const std::string& file_name, android::base::LogSeverity level) {
File file(file_name, O_RDONLY, false);
if (!file.IsOpened()) {
return false;
}
constexpr size_t kBufSize = 256; // Small buffer. Avoid stack overflow and stack size warnings.
char buf[kBufSize + 1]; // +1 for terminator.
size_t filled_to = 0;
while (true) {
DCHECK_LT(filled_to, kBufSize);
int64_t n = TEMP_FAILURE_RETRY(read(file.Fd(), &buf[filled_to], kBufSize - filled_to));
if (n <= 0) {
// Print the rest of the buffer, if it exists.
if (filled_to > 0) {
buf[filled_to] = 0;
LOG(level) << buf;
}
return n == 0;
}
// Scan for '\n'.
size_t i = filled_to;
bool found_newline = false;
for (; i < filled_to + n; ++i) {
if (buf[i] == '\n') {
// Found a line break, that's something to print now.
buf[i] = 0;
LOG(level) << buf;
// Copy the rest to the front.
if (i + 1 < filled_to + n) {
memmove(&buf[0], &buf[i + 1], filled_to + n - i - 1);
filled_to = filled_to + n - i - 1;
} else {
filled_to = 0;
}
found_newline = true;
break;
}
}
if (found_newline) {
continue;
} else {
filled_to += n;
// Check if we must flush now.
if (filled_to == kBufSize) {
buf[kBufSize] = 0;
LOG(level) << buf;
filled_to = 0;
}
}
}
}
} // namespace art
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