1 //===-- Log.h ---------------------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLDB_UTILITY_LOG_H
11 #define LLDB_UTILITY_LOG_H
13 #include "lldb/Utility/Flags.h"
14 #include "lldb/Utility/Logging.h"
15 #include "lldb/lldb-defines.h"
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/StringMap.h" // for StringMap
19 #include "llvm/ADT/StringRef.h" // for StringRef, StringLiteral
20 #include "llvm/Support/Error.h"
21 #include "llvm/Support/FormatVariadic.h"
22 #include "llvm/Support/ManagedStatic.h"
23 #include "llvm/Support/RWMutex.h"
28 #include <memory> // for shared_ptr
29 #include <string> // for string
30 #include <type_traits> // for forward
35 //----------------------------------------------------------------------
37 //----------------------------------------------------------------------
38 #define LLDB_LOG_OPTION_THREADSAFE (1u << 0)
39 #define LLDB_LOG_OPTION_VERBOSE (1u << 1)
40 #define LLDB_LOG_OPTION_PREPEND_SEQUENCE (1u << 3)
41 #define LLDB_LOG_OPTION_PREPEND_TIMESTAMP (1u << 4)
42 #define LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD (1u << 5)
43 #define LLDB_LOG_OPTION_PREPEND_THREAD_NAME (1U << 6)
44 #define LLDB_LOG_OPTION_BACKTRACE (1U << 7)
45 #define LLDB_LOG_OPTION_APPEND (1U << 8)
46 #define LLDB_LOG_OPTION_PREPEND_FILE_FUNCTION (1U << 9)
48 //----------------------------------------------------------------------
50 //----------------------------------------------------------------------
51 namespace lldb_private {
55 // Description of a log channel category.
57 llvm::StringLiteral name;
58 llvm::StringLiteral description;
62 // This class describes a log channel. It also encapsulates the behavior
63 // necessary to enable a log channel in an atomic manner.
65 std::atomic<Log *> log_ptr;
69 const llvm::ArrayRef<Category> categories;
70 const uint32_t default_flags;
72 constexpr Channel(llvm::ArrayRef<Log::Category> categories,
73 uint32_t default_flags)
74 : log_ptr(nullptr), categories(categories),
75 default_flags(default_flags) {}
77 // This function is safe to call at any time If the channel is disabled
78 // after (or concurrently with) this function returning a non-null Log
79 // pointer, it is still safe to attempt to write to the Log object -- the
80 // output will be discarded.
81 Log *GetLogIfAll(uint32_t mask) {
82 Log *log = log_ptr.load(std::memory_order_relaxed);
83 if (log && log->GetMask().AllSet(mask))
88 // This function is safe to call at any time If the channel is disabled
89 // after (or concurrently with) this function returning a non-null Log
90 // pointer, it is still safe to attempt to write to the Log object -- the
91 // output will be discarded.
92 Log *GetLogIfAny(uint32_t mask) {
93 Log *log = log_ptr.load(std::memory_order_relaxed);
94 if (log && log->GetMask().AnySet(mask))
101 static void Initialize();
103 //------------------------------------------------------------------
104 // Static accessors for logging channels
105 //------------------------------------------------------------------
106 static void Register(llvm::StringRef name, Channel &channel);
107 static void Unregister(llvm::StringRef name);
110 EnableLogChannel(const std::shared_ptr<llvm::raw_ostream> &log_stream_sp,
111 uint32_t log_options, llvm::StringRef channel,
112 llvm::ArrayRef<const char *> categories,
113 llvm::raw_ostream &error_stream);
115 static bool DisableLogChannel(llvm::StringRef channel,
116 llvm::ArrayRef<const char *> categories,
117 llvm::raw_ostream &error_stream);
119 static bool ListChannelCategories(llvm::StringRef channel, llvm::raw_ostream &stream);
121 static void DisableAllLogChannels();
123 static void ListAllLogChannels(llvm::raw_ostream &stream);
125 //------------------------------------------------------------------
128 // These functions are safe to call at any time you have a Log* obtained from
129 // the Channel class. If logging is disabled between you obtaining the Log
130 // object and writing to it, the output will be silently discarded.
131 //------------------------------------------------------------------
132 Log(Channel &channel) : m_channel(channel) {}
135 void PutCString(const char *cstr);
136 void PutString(llvm::StringRef str);
138 template <typename... Args>
139 void Format(llvm::StringRef file, llvm::StringRef function,
140 const char *format, Args &&... args) {
141 Format(file, function, llvm::formatv(format, std::forward<Args>(args)...));
144 template <typename... Args>
145 void FormatError(llvm::Error error, llvm::StringRef file,
146 llvm::StringRef function, const char *format,
148 Format(file, function,
149 llvm::formatv(format, llvm::toString(std::move(error)),
150 std::forward<Args>(args)...));
153 void Printf(const char *format, ...) __attribute__((format(printf, 2, 3)));
155 void VAPrintf(const char *format, va_list args);
157 void Error(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
159 void VAError(const char *format, va_list args);
161 void Verbose(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
163 void Warning(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
165 const Flags GetOptions() const;
167 const Flags GetMask() const;
169 bool GetVerbose() const;
174 // The mutex makes sure enable/disable operations are thread-safe. The
175 // options and mask variables are atomic to enable their reading in
176 // Channel::GetLogIfAny without taking the mutex to speed up the fast path.
177 // Their modification however, is still protected by this mutex.
178 llvm::sys::RWMutex m_mutex;
180 std::shared_ptr<llvm::raw_ostream> m_stream_sp;
181 std::atomic<uint32_t> m_options{0};
182 std::atomic<uint32_t> m_mask{0};
184 void WriteHeader(llvm::raw_ostream &OS, llvm::StringRef file,
185 llvm::StringRef function);
186 void WriteMessage(const std::string &message);
188 void Format(llvm::StringRef file, llvm::StringRef function,
189 const llvm::formatv_object_base &payload);
191 std::shared_ptr<llvm::raw_ostream> GetStream() {
192 llvm::sys::ScopedReader lock(m_mutex);
196 void Enable(const std::shared_ptr<llvm::raw_ostream> &stream_sp,
197 uint32_t options, uint32_t flags);
199 void Disable(uint32_t flags);
201 typedef llvm::StringMap<Log> ChannelMap;
202 static llvm::ManagedStatic<ChannelMap> g_channel_map;
204 static void ListCategories(llvm::raw_ostream &stream,
205 const ChannelMap::value_type &entry);
206 static uint32_t GetFlags(llvm::raw_ostream &stream, const ChannelMap::value_type &entry,
207 llvm::ArrayRef<const char *> categories);
209 static void DisableLoggingChild();
211 Log(const Log &) = delete;
212 void operator=(const Log &) = delete;
215 } // namespace lldb_private
217 #define LLDB_LOG(log, ...) \
219 ::lldb_private::Log *log_private = (log); \
221 log_private->Format(__FILE__, __func__, __VA_ARGS__); \
224 #define LLDB_LOGV(log, ...) \
226 ::lldb_private::Log *log_private = (log); \
227 if (log_private && log_private->GetVerbose()) \
228 log_private->Format(__FILE__, __func__, __VA_ARGS__); \
231 // Write message to log, if error is set. In the log message refer to the error
232 // with {0}. Error is cleared regardless of whether logging is enabled.
233 #define LLDB_LOG_ERROR(log, error, ...) \
235 ::lldb_private::Log *log_private = (log); \
236 ::llvm::Error error_private = (error); \
237 if (log_private && error_private) { \
238 log_private->FormatError(::std::move(error_private), __FILE__, __func__, \
241 ::llvm::consumeError(::std::move(error_private)); \
244 #endif // LLDB_UTILITY_LOG_H