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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 #ifndef ART_LIBARTBASE_BASE_LOGGING_H_
18 #define ART_LIBARTBASE_BASE_LOGGING_H_
19 
20 #include <sstream>
21 #include <variant>
22 
23 #include "android-base/logging.h"
24 #include "macros.h"
25 
26 namespace art {
27 
28 // Make libbase's LogSeverity more easily available.
29 using ::android::base::LogSeverity;
30 using ::android::base::ScopedLogSeverity;
31 
32 // Abort function.
33 using AbortFunction = void(const char*);
34 
35 // The members of this struct are the valid arguments to VLOG and VLOG_IS_ON in code,
36 // and the "-verbose:" command line argument.
37 struct LogVerbosity {
38   bool class_linker;  // Enabled with "-verbose:class".
39   bool collector;
40   bool compiler;
41   bool deopt;
42   bool gc;
43   bool heap;
44   bool interpreter;  // Enabled with "-verbose:interpreter".
45   bool jdwp;
46   bool jit;
47   bool jni;
48   bool monitor;
49   bool oat;
50   bool profiler;
51   bool signals;
52   bool simulator;
53   bool startup;
54   bool third_party_jni;  // Enabled with "-verbose:third-party-jni".
55   bool threads;
56   bool verifier;
57   bool verifier_debug;   // Only works in debug builds.
58   bool image;
59   bool systrace_lock_logging;  // Enabled with "-verbose:sys-locks".
60   bool agents;
61   bool dex;  // Some dex access output etc.
62   bool plugin;  // Used by some plugins.
63 };
64 
65 // Global log verbosity setting, initialized by InitLogging.
66 extern LogVerbosity gLogVerbosity;
67 
68 // Configure logging based on ANDROID_LOG_TAGS environment variable.
69 // We need to parse a string that looks like
70 //
71 //      *:v jdwp:d dalvikvm:d dalvikvm-gc:i dalvikvmi:i
72 //
73 // The tag (or '*' for the global level) comes first, followed by a colon
74 // and a letter indicating the minimum priority level we're expected to log.
75 // This can be used to reveal or conceal logs with specific tags.
76 extern void InitLogging(char* argv[], AbortFunction& default_aborter);
77 
78 // Returns the command line used to invoke the current tool or null if InitLogging hasn't been
79 // performed.
80 extern const char* GetCmdLine();
81 
82 // The command used to start the ART runtime, such as "/apex/com.android.art/bin/dalvikvm". If
83 // InitLogging hasn't been performed then just returns "art".
84 extern const char* ProgramInvocationName();
85 
86 // A short version of the command used to start the ART runtime, such as "dalvikvm". If InitLogging
87 // hasn't been performed then just returns "art".
88 extern const char* ProgramInvocationShortName();
89 
90 class LogHelper {
91  public:
92   // A logging helper for logging a single line. Can be used with little stack.
93   static void LogLineLowStack(const char* file,
94                               unsigned int line,
95                               android::base::LogSeverity severity,
96                               const char* msg);
97 
98  private:
99   DISALLOW_ALLOCATION();
100   DISALLOW_COPY_AND_ASSIGN(LogHelper);
101 };
102 
103 // Copy the contents of file_name to the log stream for level.
104 bool PrintFileToLog(const std::string& file_name, android::base::LogSeverity level);
105 
106 // Is verbose logging enabled for the given module? Where the module is defined in LogVerbosity.
107 #define VLOG_IS_ON(module) UNLIKELY(::art::gLogVerbosity.module)
108 
109 // Variant of LOG that logs when verbose logging is enabled for a module. For example,
110 // VLOG(jni) << "A JNI operation was performed";
111 #define VLOG(module) if (VLOG_IS_ON(module)) LOG(INFO)
112 
113 // Holder to implement VLOG_STREAM.
114 class VlogMessage {
115  public:
116   // TODO Taken from android_base.
VlogMessage(bool enable,const char * file,unsigned int line,::android::base::LogSeverity severity,const char * tag,int error)117   VlogMessage(bool enable,
118               const char* file,
119               unsigned int line,
120               ::android::base::LogSeverity severity,
121               const char* tag,
122               int error)
123       : msg_(std::in_place_type<std::ostringstream>) {
124     if (enable) {
125       msg_.emplace<::android::base::LogMessage>(file, line, severity, tag, error);
126     }
127   }
128 
stream()129   std::ostream& stream() {
130     if (std::holds_alternative<std::ostringstream>(msg_)) {
131       return std::get<std::ostringstream>(msg_);
132     } else {
133       return std::get<::android::base::LogMessage>(msg_).stream();
134     }
135   }
136 
137  private:
138   std::variant<::android::base::LogMessage, std::ostringstream> msg_;
139 };
140 
141 // Return the stream associated with logging for the given module. NB Unlike VLOG function calls
142 // will still be performed. Output will be suppressed if the module is not on.
143 #define VLOG_STREAM(module)                    \
144   ::art::VlogMessage(VLOG_IS_ON(module),       \
145                      __FILE__,                 \
146                      __LINE__,                 \
147                      ::android::base::INFO,    \
148                      _LOG_TAG_INTERNAL,        \
149                      -1)                       \
150       .stream()
151 
152 }  // namespace art
153 
154 #endif  // ART_LIBARTBASE_BASE_LOGGING_H_
155