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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 "base/mutex.h"
     20 #include "runtime.h"
     21 #include "thread-inl.h"
     22 #include "utils.h"
     23 
     24 namespace art {
     25 
     26 LogVerbosity gLogVerbosity;
     27 
     28 std::vector<std::string> gVerboseMethods;
     29 
     30 unsigned int gAborting = 0;
     31 
     32 static LogSeverity gMinimumLogSeverity = INFO;
     33 static std::unique_ptr<std::string> gCmdLine;
     34 static std::unique_ptr<std::string> gProgramInvocationName;
     35 static std::unique_ptr<std::string> gProgramInvocationShortName;
     36 
     37 const char* GetCmdLine() {
     38   return (gCmdLine.get() != nullptr) ? gCmdLine->c_str() : nullptr;
     39 }
     40 
     41 const char* ProgramInvocationName() {
     42   return (gProgramInvocationName.get() != nullptr) ? gProgramInvocationName->c_str() : "art";
     43 }
     44 
     45 const char* ProgramInvocationShortName() {
     46   return (gProgramInvocationShortName.get() != nullptr) ? gProgramInvocationShortName->c_str()
     47                                                         : "art";
     48 }
     49 
     50 // Configure logging based on ANDROID_LOG_TAGS environment variable.
     51 // We need to parse a string that looks like
     52 //
     53 //      *:v jdwp:d dalvikvm:d dalvikvm-gc:i dalvikvmi:i
     54 //
     55 // The tag (or '*' for the global level) comes first, followed by a colon
     56 // and a letter indicating the minimum priority level we're expected to log.
     57 // This can be used to reveal or conceal logs with specific tags.
     58 void InitLogging(char* argv[]) {
     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 != NULL) {
     69     gCmdLine.reset(new std::string(argv[0]));
     70     for (size_t i = 1; argv[i] != NULL; ++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 != NULL) ? 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   const char* tags = getenv("ANDROID_LOG_TAGS");
     83   if (tags == NULL) {
     84     return;
     85   }
     86 
     87   std::vector<std::string> specs;
     88   Split(tags, ' ', specs);
     89   for (size_t i = 0; i < specs.size(); ++i) {
     90     // "tag-pattern:[vdiwefs]"
     91     std::string spec(specs[i]);
     92     if (spec.size() == 3 && StartsWith(spec, "*:")) {
     93       switch (spec[2]) {
     94         case 'v':
     95           gMinimumLogSeverity = VERBOSE;
     96           continue;
     97         case 'd':
     98           gMinimumLogSeverity = DEBUG;
     99           continue;
    100         case 'i':
    101           gMinimumLogSeverity = INFO;
    102           continue;
    103         case 'w':
    104           gMinimumLogSeverity = WARNING;
    105           continue;
    106         case 'e':
    107           gMinimumLogSeverity = ERROR;
    108           continue;
    109         case 'f':
    110           gMinimumLogSeverity = FATAL;
    111           continue;
    112         // liblog will even suppress FATAL if you say 's' for silent, but that's crazy!
    113         case 's':
    114           gMinimumLogSeverity = FATAL;
    115           continue;
    116       }
    117     }
    118     LOG(FATAL) << "unsupported '" << spec << "' in ANDROID_LOG_TAGS (" << tags << ")";
    119   }
    120 }
    121 
    122 LogMessageData::LogMessageData(const char* file, int line, LogSeverity severity, int error)
    123     : file(file),
    124       line_number(line),
    125       severity(severity),
    126       error(error) {
    127   const char* last_slash = strrchr(file, '/');
    128   file = (last_slash == NULL) ? file : last_slash + 1;
    129 }
    130 
    131 LogMessage::~LogMessage() {
    132   if (data_->severity < gMinimumLogSeverity) {
    133     return;  // No need to format something we're not going to output.
    134   }
    135 
    136   // Finish constructing the message.
    137   if (data_->error != -1) {
    138     data_->buffer << ": " << strerror(data_->error);
    139   }
    140   std::string msg(data_->buffer.str());
    141 
    142   // Do the actual logging with the lock held.
    143   {
    144     MutexLock mu(Thread::Current(), *Locks::logging_lock_);
    145     if (msg.find('\n') == std::string::npos) {
    146       LogLine(*data_, msg.c_str());
    147     } else {
    148       msg += '\n';
    149       size_t i = 0;
    150       while (i < msg.size()) {
    151         size_t nl = msg.find('\n', i);
    152         msg[nl] = '\0';
    153         LogLine(*data_, &msg[i]);
    154         i = nl + 1;
    155       }
    156     }
    157   }
    158 
    159   // Abort if necessary.
    160   if (data_->severity == FATAL) {
    161     Runtime::Abort();
    162   }
    163 }
    164 
    165 }  // namespace art
    166