1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
//===-- Log.h ---------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_UTILITY_LOG_H
#define LLDB_UTILITY_LOG_H
#include "lldb/Utility/Flags.h"
#include "lldb/Utility/Logging.h"
#include "lldb/lldb-defines.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringMap.h" // for StringMap
#include "llvm/ADT/StringRef.h" // for StringRef, StringLiteral
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/RWMutex.h"
#include <atomic>
#include <cstdarg>
#include <cstdint>
#include <memory> // for shared_ptr
#include <string> // for string
#include <type_traits> // for forward
namespace llvm {
class raw_ostream;
}
//----------------------------------------------------------------------
// Logging Options
//----------------------------------------------------------------------
#define LLDB_LOG_OPTION_THREADSAFE (1u << 0)
#define LLDB_LOG_OPTION_VERBOSE (1u << 1)
#define LLDB_LOG_OPTION_PREPEND_SEQUENCE (1u << 3)
#define LLDB_LOG_OPTION_PREPEND_TIMESTAMP (1u << 4)
#define LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD (1u << 5)
#define LLDB_LOG_OPTION_PREPEND_THREAD_NAME (1U << 6)
#define LLDB_LOG_OPTION_BACKTRACE (1U << 7)
#define LLDB_LOG_OPTION_APPEND (1U << 8)
#define LLDB_LOG_OPTION_PREPEND_FILE_FUNCTION (1U << 9)
//----------------------------------------------------------------------
// Logging Functions
//----------------------------------------------------------------------
namespace lldb_private {
class Log final {
public:
// Description of a log channel category.
struct Category {
llvm::StringLiteral name;
llvm::StringLiteral description;
uint32_t flag;
};
// This class describes a log channel. It also encapsulates the behavior
// necessary to enable a log channel in an atomic manner.
class Channel {
std::atomic<Log *> log_ptr;
friend class Log;
public:
const llvm::ArrayRef<Category> categories;
const uint32_t default_flags;
constexpr Channel(llvm::ArrayRef<Log::Category> categories,
uint32_t default_flags)
: log_ptr(nullptr), categories(categories),
default_flags(default_flags) {}
// This function is safe to call at any time
// If the channel is disabled after (or concurrently with) this function
// returning a non-null Log pointer, it is still safe to attempt to write to
// the Log object -- the output will be discarded.
Log *GetLogIfAll(uint32_t mask) {
Log *log = log_ptr.load(std::memory_order_relaxed);
if (log && log->GetMask().AllSet(mask))
return log;
return nullptr;
}
// This function is safe to call at any time
// If the channel is disabled after (or concurrently with) this function
// returning a non-null Log pointer, it is still safe to attempt to write to
// the Log object -- the output will be discarded.
Log *GetLogIfAny(uint32_t mask) {
Log *log = log_ptr.load(std::memory_order_relaxed);
if (log && log->GetMask().AnySet(mask))
return log;
return nullptr;
}
};
//------------------------------------------------------------------
// Static accessors for logging channels
//------------------------------------------------------------------
static void Register(llvm::StringRef name, Channel &channel);
static void Unregister(llvm::StringRef name);
static bool
EnableLogChannel(const std::shared_ptr<llvm::raw_ostream> &log_stream_sp,
uint32_t log_options, llvm::StringRef channel,
llvm::ArrayRef<const char *> categories,
llvm::raw_ostream &error_stream);
static bool DisableLogChannel(llvm::StringRef channel,
llvm::ArrayRef<const char *> categories,
llvm::raw_ostream &error_stream);
static bool ListChannelCategories(llvm::StringRef channel, llvm::raw_ostream &stream);
static void DisableAllLogChannels();
static void ListAllLogChannels(llvm::raw_ostream &stream);
//------------------------------------------------------------------
// Member functions
//
// These functions are safe to call at any time you have a Log* obtained from
// the Channel class. If logging is disabled between you obtaining the Log
// object and writing to it, the output will be silently discarded.
//------------------------------------------------------------------
Log(Channel &channel) : m_channel(channel) {}
~Log() = default;
void PutCString(const char *cstr);
void PutString(llvm::StringRef str);
template <typename... Args>
void Format(llvm::StringRef file, llvm::StringRef function,
const char *format, Args &&... args) {
Format(file, function, llvm::formatv(format, std::forward<Args>(args)...));
}
void Printf(const char *format, ...) __attribute__((format(printf, 2, 3)));
void VAPrintf(const char *format, va_list args);
void Error(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
void VAError(const char *format, va_list args);
void Verbose(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
void Warning(const char *fmt, ...) __attribute__((format(printf, 2, 3)));
const Flags GetOptions() const;
const Flags GetMask() const;
bool GetVerbose() const;
private:
Channel &m_channel;
// The mutex makes sure enable/disable operations are thread-safe. The options
// and mask variables are atomic to enable their reading in
// Channel::GetLogIfAny without taking the mutex to speed up the fast path.
// Their modification however, is still protected by this mutex.
llvm::sys::RWMutex m_mutex;
std::shared_ptr<llvm::raw_ostream> m_stream_sp;
std::atomic<uint32_t> m_options{0};
std::atomic<uint32_t> m_mask{0};
void WriteHeader(llvm::raw_ostream &OS, llvm::StringRef file,
llvm::StringRef function);
void WriteMessage(const std::string &message);
void Format(llvm::StringRef file, llvm::StringRef function,
const llvm::formatv_object_base &payload);
std::shared_ptr<llvm::raw_ostream> GetStream() {
llvm::sys::ScopedReader lock(m_mutex);
return m_stream_sp;
}
void Enable(const std::shared_ptr<llvm::raw_ostream> &stream_sp,
uint32_t options, uint32_t flags);
void Disable(uint32_t flags);
typedef llvm::StringMap<Log> ChannelMap;
static llvm::ManagedStatic<ChannelMap> g_channel_map;
static void ListCategories(llvm::raw_ostream &stream,
const ChannelMap::value_type &entry);
static uint32_t GetFlags(llvm::raw_ostream &stream, const ChannelMap::value_type &entry,
llvm::ArrayRef<const char *> categories);
Log(const Log &) = delete;
void operator=(const Log &) = delete;
};
} // namespace lldb_private
#define LLDB_LOG(log, ...) \
do { \
::lldb_private::Log *log_private = (log); \
if (log_private) \
log_private->Format(__FILE__, __FUNCTION__, __VA_ARGS__); \
} while (0)
#define LLDB_LOGV(log, ...) \
do { \
::lldb_private::Log *log_private = (log); \
if (log_private && log_private->GetVerbose()) \
log_private->Format(__FILE__, __FUNCTION__, __VA_ARGS__); \
} while (0)
#endif // LLDB_UTILITY_LOG_H
|
