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/FormatVariadic.h"
21 #include "llvm/Support/ManagedStatic.h"
22 #include "llvm/Support/RWMutex.h"
27 #include <memory> // for shared_ptr
28 #include <string> // for string
29 #include <type_traits> // for forward
34 //----------------------------------------------------------------------
36 //----------------------------------------------------------------------
37 #define LLDB_LOG_OPTION_THREADSAFE (1u << 0)
38 #define LLDB_LOG_OPTION_VERBOSE (1u << 1)
39 #define LLDB_LOG_OPTION_PREPEND_SEQUENCE (1u << 3)
40 #define LLDB_LOG_OPTION_PREPEND_TIMESTAMP (1u << 4)
41 #define LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD (1u << 5)
42 #define LLDB_LOG_OPTION_PREPEND_THREAD_NAME (1U << 6)
43 #define LLDB_LOG_OPTION_BACKTRACE (1U << 7)
44 #define LLDB_LOG_OPTION_APPEND (1U << 8)
45 #define LLDB_LOG_OPTION_PREPEND_FILE_FUNCTION (1U << 9)
47 //----------------------------------------------------------------------
49 //----------------------------------------------------------------------
50 namespace lldb_private {
54 // Description of a log channel category.
56 llvm::StringLiteral name;
57 llvm::StringLiteral description;
61 // This class describes a log channel. It also encapsulates the behavior
62 // necessary to enable a log channel in an atomic manner.
64 std::atomic<Log *> log_ptr;
68 const llvm::ArrayRef<Category> categories;
69 const uint32_t default_flags;
71 constexpr Channel(llvm::ArrayRef<Log::Category> categories,
72 uint32_t default_flags)
73 : log_ptr(nullptr), categories(categories),
74 default_flags(default_flags) {}
76 // This function is safe to call at any time
77 // If the channel is disabled after (or concurrently with) this function
78 // returning a non-null Log pointer, it is still safe to attempt to write to
79 // the Log object -- the output will be discarded.
80 Log *GetLogIfAll(uint32_t mask) {
81 Log *log = log_ptr.load(std::memory_order_relaxed);
82 if (log && log->GetMask().AllSet(mask))
87 // This function is safe to call at any time
88 // If the channel is disabled after (or concurrently with) this function
89 // returning a non-null Log pointer, it is still safe to attempt to write to
90 // the Log object -- the output will be discarded.
91 Log *GetLogIfAny(uint32_t mask) {
92 Log *log = log_ptr.load(std::memory_order_relaxed);
93 if (log && log->GetMask().AnySet(mask))
100 static void Initialize();
102 //------------------------------------------------------------------
103 // Static accessors for logging channels
104 //------------------------------------------------------------------
105 static void Register(llvm::StringRef name, Channel &channel);
106 static void Unregister(llvm::StringRef name);
109 EnableLogChannel(const std::shared_ptr<llvm::raw_ostream> &log_stream_sp,
110 uint32_t log_options, llvm::StringRef channel,
111 llvm::ArrayRef<const char *> categories,
112 llvm::raw_ostream &error_stream);
114 static bool DisableLogChannel(llvm::StringRef channel,
115 llvm::ArrayRef<const char *> categories,
116 llvm::raw_ostream &error_stream);
118 static bool ListChannelCategories(llvm::StringRef channel, llvm::raw_ostream &stream);
120 static void DisableAllLogChannels();
122 static void ListAllLogChannels(llvm::raw_ostream &stream);
124 //------------------------------------------------------------------
127 // These functions are safe to call at any time you have a Log* obtained from
128 // the Channel class. If logging is disabled between you obtaining the Log
129 // object and writing to it, the output will be silently discarded.
130 //------------------------------------------------------------------
131 Log(Channel &channel) : m_channel(channel) {}
134 void PutCString(const char *cstr);
135 void PutString(llvm::StringRef str);
137 template <typename... Args>
138 void Format(llvm::StringRef file, llvm::StringRef function,
139 const char *format, Args &&... args) {
140 Format(file, function, llvm::formatv(format, std::forward<Args>(args)...));
143 void Printf(const char *format, ...) __attribute__((format(printf, 2, 3)));
145 void VAPrintf(const char *format, va_list args);
147 void Error(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
149 void VAError(const char *format, va_list args);
151 void Verbose(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
153 void Warning(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
155 const Flags GetOptions() const;
157 const Flags GetMask() const;
159 bool GetVerbose() const;
164 // The mutex makes sure enable/disable operations are thread-safe. The options
165 // and mask variables are atomic to enable their reading in
166 // Channel::GetLogIfAny without taking the mutex to speed up the fast path.
167 // Their modification however, is still protected by this mutex.
168 llvm::sys::RWMutex m_mutex;
170 std::shared_ptr<llvm::raw_ostream> m_stream_sp;
171 std::atomic<uint32_t> m_options{0};
172 std::atomic<uint32_t> m_mask{0};
174 void WriteHeader(llvm::raw_ostream &OS, llvm::StringRef file,
175 llvm::StringRef function);
176 void WriteMessage(const std::string &message);
178 void Format(llvm::StringRef file, llvm::StringRef function,
179 const llvm::formatv_object_base &payload);
181 std::shared_ptr<llvm::raw_ostream> GetStream() {
182 llvm::sys::ScopedReader lock(m_mutex);
186 void Enable(const std::shared_ptr<llvm::raw_ostream> &stream_sp,
187 uint32_t options, uint32_t flags);
189 void Disable(uint32_t flags);
191 typedef llvm::StringMap<Log> ChannelMap;
192 static llvm::ManagedStatic<ChannelMap> g_channel_map;
194 static void ListCategories(llvm::raw_ostream &stream,
195 const ChannelMap::value_type &entry);
196 static uint32_t GetFlags(llvm::raw_ostream &stream, const ChannelMap::value_type &entry,
197 llvm::ArrayRef<const char *> categories);
199 static void DisableLoggingChild();
201 Log(const Log &) = delete;
202 void operator=(const Log &) = delete;
205 } // namespace lldb_private
207 #define LLDB_LOG(log, ...) \
209 ::lldb_private::Log *log_private = (log); \
211 log_private->Format(__FILE__, __FUNCTION__, __VA_ARGS__); \
214 #define LLDB_LOGV(log, ...) \
216 ::lldb_private::Log *log_private = (log); \
217 if (log_private && log_private->GetVerbose()) \
218 log_private->Format(__FILE__, __FUNCTION__, __VA_ARGS__); \
221 #endif // LLDB_UTILITY_LOG_H