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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "logging.h"
     18 
     19 #include <iostream>
     20 #include <limits>
     21 #include <sstream>
     22 
     23 #include "base/mutex.h"
     24 #include "thread-inl.h"
     25 #include "utils.h"
     26 
     27 // Headers for LogMessage::LogLine.
     28 #ifdef ART_TARGET_ANDROID
     29 #include <log/log.h>
     30 #else
     31 #include <sys/types.h>
     32 #include <unistd.h>
     33 #endif
     34 
     35 namespace art {
     36 
     37 LogVerbosity gLogVerbosity;
     38 
     39 unsigned int gAborting = 0;
     40 
     41 static std::unique_ptr<std::string> gCmdLine;
     42 static std::unique_ptr<std::string> gProgramInvocationName;
     43 static std::unique_ptr<std::string> gProgramInvocationShortName;
     44 
     45 const char* GetCmdLine() {
     46   return (gCmdLine.get() != nullptr) ? gCmdLine->c_str() : nullptr;
     47 }
     48 
     49 const char* ProgramInvocationName() {
     50   return (gProgramInvocationName.get() != nullptr) ? gProgramInvocationName->c_str() : "art";
     51 }
     52 
     53 const char* ProgramInvocationShortName() {
     54   return (gProgramInvocationShortName.get() != nullptr) ? gProgramInvocationShortName->c_str()
     55                                                         : "art";
     56 }
     57 
     58 void InitLogging(char* argv[], AbortFunction& abort_function) {
     59   if (gCmdLine.get() != nullptr) {
     60     return;
     61   }
     62   // TODO: Move this to a more obvious InitART...
     63   Locks::Init();
     64 
     65   // Stash the command line for later use. We can use /proc/self/cmdline on Linux to recover this,
     66   // but we don't have that luxury on the Mac, and there are a couple of argv[0] variants that are
     67   // commonly used.
     68   if (argv != nullptr) {
     69     gCmdLine.reset(new std::string(argv[0]));
     70     for (size_t i = 1; argv[i] != nullptr; ++i) {
     71       gCmdLine->append(" ");
     72       gCmdLine->append(argv[i]);
     73     }
     74     gProgramInvocationName.reset(new std::string(argv[0]));
     75     const char* last_slash = strrchr(argv[0], '/');
     76     gProgramInvocationShortName.reset(new std::string((last_slash != nullptr) ? last_slash + 1
     77                                                                            : argv[0]));
     78   } else {
     79     // TODO: fall back to /proc/self/cmdline when argv is null on Linux.
     80     gCmdLine.reset(new std::string("<unset>"));
     81   }
     82 
     83 #ifdef ART_TARGET_ANDROID
     84 #define INIT_LOGGING_DEFAULT_LOGGER android::base::LogdLogger()
     85 #else
     86 #define INIT_LOGGING_DEFAULT_LOGGER android::base::StderrLogger
     87 #endif
     88   android::base::InitLogging(argv, INIT_LOGGING_DEFAULT_LOGGER,
     89                              std::move<AbortFunction>(abort_function));
     90 #undef INIT_LOGGING_DEFAULT_LOGGER
     91 }
     92 
     93 #ifdef ART_TARGET_ANDROID
     94 static const android_LogPriority kLogSeverityToAndroidLogPriority[] = {
     95   ANDROID_LOG_VERBOSE, ANDROID_LOG_DEBUG, ANDROID_LOG_INFO, ANDROID_LOG_WARN,
     96   ANDROID_LOG_ERROR, ANDROID_LOG_FATAL, ANDROID_LOG_FATAL
     97 };
     98 static_assert(arraysize(kLogSeverityToAndroidLogPriority) == ::android::base::FATAL + 1,
     99               "Mismatch in size of kLogSeverityToAndroidLogPriority and values in LogSeverity");
    100 #endif
    101 
    102 void LogHelper::LogLineLowStack(const char* file,
    103                                 unsigned int line,
    104                                 LogSeverity log_severity,
    105                                 const char* message) {
    106 #ifdef ART_TARGET_ANDROID
    107   // Use android_writeLog() to avoid stack-based buffers used by android_printLog().
    108   const char* tag = ProgramInvocationShortName();
    109   int priority = kLogSeverityToAndroidLogPriority[static_cast<size_t>(log_severity)];
    110   char* buf = nullptr;
    111   size_t buf_size = 0u;
    112   if (priority == ANDROID_LOG_FATAL) {
    113     // Allocate buffer for snprintf(buf, buf_size, "%s:%u] %s", file, line, message) below.
    114     // If allocation fails, fall back to printing only the message.
    115     buf_size = strlen(file) + 1 /* ':' */ + std::numeric_limits<typeof(line)>::max_digits10 +
    116         2 /* "] " */ + strlen(message) + 1 /* terminating 0 */;
    117     buf = reinterpret_cast<char*>(malloc(buf_size));
    118   }
    119   if (buf != nullptr) {
    120     snprintf(buf, buf_size, "%s:%u] %s", file, line, message);
    121     android_writeLog(priority, tag, buf);
    122     free(buf);
    123   } else {
    124     android_writeLog(priority, tag, message);
    125   }
    126 #else
    127   static constexpr char kLogCharacters[] = { 'V', 'D', 'I', 'W', 'E', 'F', 'F' };
    128   static_assert(
    129       arraysize(kLogCharacters) == static_cast<size_t>(::android::base::FATAL) + 1,
    130       "Wrong character array size");
    131 
    132   const char* program_name = ProgramInvocationShortName();
    133   TEMP_FAILURE_RETRY(write(STDERR_FILENO, program_name, strlen(program_name)));
    134   TEMP_FAILURE_RETRY(write(STDERR_FILENO, " ", 1));
    135   TEMP_FAILURE_RETRY(write(STDERR_FILENO, &kLogCharacters[static_cast<size_t>(log_severity)], 1));
    136   TEMP_FAILURE_RETRY(write(STDERR_FILENO, " ", 1));
    137   // TODO: pid and tid.
    138   TEMP_FAILURE_RETRY(write(STDERR_FILENO, file, strlen(file)));
    139   // TODO: line.
    140   UNUSED(line);
    141   TEMP_FAILURE_RETRY(write(STDERR_FILENO, "] ", 2));
    142   TEMP_FAILURE_RETRY(write(STDERR_FILENO, message, strlen(message)));
    143   TEMP_FAILURE_RETRY(write(STDERR_FILENO, "\n", 1));
    144 #endif  // ART_TARGET_ANDROID
    145 }
    146 
    147 }  // namespace art
    148