VTK  9.1.0
vtkLogger.h
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1 /*=========================================================================
2 
3  Program: Visualization Toolkit
4  Module: vtkLogger.h
5 
6  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7  All rights reserved.
8  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9 
10  This software is distributed WITHOUT ANY WARRANTY; without even
11  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12  PURPOSE. See the above copyright notice for more information.
13 
14 =========================================================================*/
150 #ifndef vtkLogger_h
151 #define vtkLogger_h
152 
153 #include "vtkObjectBase.h"
154 #include "vtkSetGet.h" // needed for macros
155 
156 #include <string> // needed for std::string
157 
158 #if defined(_MSC_VER)
159 #include <sal.h> // Needed for _In_z_ etc annotations
160 #endif
161 
162 // this is copied from `loguru.hpp`
163 #if defined(__clang__) || defined(__GNUC__)
164 // Helper macro for declaring functions as having similar signature to printf.
165 // This allows the compiler to catch format errors at compile-time.
166 #define VTK_PRINTF_LIKE(fmtarg, firstvararg) \
167  __attribute__((__format__(__printf__, fmtarg, firstvararg)))
168 #define VTK_FORMAT_STRING_TYPE const char*
169 #elif defined(_MSC_VER)
170 #define VTK_PRINTF_LIKE(fmtarg, firstvararg)
171 #define VTK_FORMAT_STRING_TYPE _In_z_ _Printf_format_string_ const char*
172 #else
173 #define VTK_PRINTF_LIKE(fmtarg, firstvararg)
174 #define VTK_FORMAT_STRING_TYPE const char*
175 #endif
176 
177 class VTKCOMMONCORE_EXPORT vtkLogger : public vtkObjectBase
178 {
179 public:
181  void PrintSelf(ostream& os, vtkIndent indent) override;
182 
184  {
185  // Used to mark an invalid verbosity. Do not log to this level.
186  VERBOSITY_INVALID = -10, // Never do LOG_F(INVALID)
187 
188  // You may use VERBOSITY_OFF on g_stderr_verbosity, but for nothing else!
189  VERBOSITY_OFF = -9, // Never do LOG_F(OFF)
190 
191  VERBOSITY_ERROR = -2,
192  VERBOSITY_WARNING = -1,
193 
194  // Normal messages. By default written to stderr.
195  VERBOSITY_INFO = 0,
196 
197  // Same as VERBOSITY_INFO in every way.
198  VERBOSITY_0 = 0,
199 
200  // Verbosity levels 1-9 are generally not written to stderr, but are written to file.
201  VERBOSITY_1 = +1,
202  VERBOSITY_2 = +2,
203  VERBOSITY_3 = +3,
204  VERBOSITY_4 = +4,
205  VERBOSITY_5 = +5,
206  VERBOSITY_6 = +6,
207  VERBOSITY_7 = +7,
208  VERBOSITY_8 = +8,
209  VERBOSITY_9 = +9,
210 
211  // trace level, same as VERBOSITY_9
212  VERBOSITY_TRACE = +9,
213 
214  // Don not use higher verbosity levels, as that will make grepping log files harder.
215  VERBOSITY_MAX = +9,
216  };
217 
255  static void Init(int& argc, char* argv[], const char* verbosity_flag = "-v");
256  static void Init();
266 
274 
279  enum FileMode
280  {
282  APPEND
283  };
284 
291  static void LogToFile(const char* path, FileMode filemode, Verbosity verbosity);
292 
296  static void EndLogToFile(const char* path);
297 
299 
302  static void SetThreadName(const std::string& name);
305 
310 
315  struct Message
316  {
317  // You would generally print a Message by just concatenating the buffers without spacing.
318  // Optionally, ignore preamble and indentation.
319  Verbosity verbosity; // Already part of preamble
320  const char* filename; // Already part of preamble
321  unsigned line; // Already part of preamble
322  const char* preamble; // Date, time, uptime, thread, file:line, verbosity.
323  const char* indentation; // Just a bunch of spacing.
324  const char* prefix; // Assertion failure info goes here (or "").
325  const char* message; // User message goes here.
326  };
327 
329 
332  using LogHandlerCallbackT = void (*)(void* user_data, const Message& message);
333  using CloseHandlerCallbackT = void (*)(void* user_data);
334  using FlushHandlerCallbackT = void (*)(void* user_data);
336 
346  static void AddCallback(const char* id, LogHandlerCallbackT callback, void* user_data,
347  Verbosity verbosity, CloseHandlerCallbackT on_close = nullptr,
348  FlushHandlerCallbackT on_flush = nullptr);
349 
354  static bool RemoveCallback(const char* id);
355 
359  static bool IsEnabled();
360 
367 
375 
382  static Verbosity ConvertToVerbosity(const char* text);
383 
385 
390  static void Log(
391  Verbosity verbosity, VTK_FILEPATH const char* fname, unsigned int lineno, const char* txt);
392  static void StartScope(
393  Verbosity verbosity, const char* id, VTK_FILEPATH const char* fname, unsigned int lineno);
394  static void EndScope(const char* id);
395 #if !defined(__WRAP__)
396  static void LogF(Verbosity verbosity, VTK_FILEPATH const char* fname, unsigned int lineno,
397  VTK_FORMAT_STRING_TYPE format, ...) VTK_PRINTF_LIKE(4, 5);
398  static void StartScopeF(Verbosity verbosity, const char* id, VTK_FILEPATH const char* fname,
399  unsigned int lineno, VTK_FORMAT_STRING_TYPE format, ...) VTK_PRINTF_LIKE(5, 6);
400 
401  class VTKCOMMONCORE_EXPORT LogScopeRAII
402  {
403  public:
405  LogScopeRAII(vtkLogger::Verbosity verbosity, const char* fname, unsigned int lineno,
406  VTK_FORMAT_STRING_TYPE format, ...) VTK_PRINTF_LIKE(5, 6);
408 #if defined(_MSC_VER) && _MSC_VER > 1800
409  // see loguru.hpp for the reason why this is needed on MSVC
410  LogScopeRAII(LogScopeRAII&& other)
411  : Internals(other.Internals)
412  {
413  other.Internals = nullptr;
414  }
415 #else
417 #endif
418 
419  private:
420  LogScopeRAII(const LogScopeRAII&) = delete;
421  void operator=(const LogScopeRAII&) = delete;
422  class LSInternals;
423  LSInternals* Internals;
424  };
425 #endif
427 
434 
435 protected:
437  ~vtkLogger() override;
438 
439 private:
440  vtkLogger(const vtkLogger&) = delete;
441  void operator=(const vtkLogger&) = delete;
442  static vtkLogger::Verbosity InternalVerbosityLevel;
443  static std::string ThreadName;
444 };
445 
447 
461 #define vtkVLogF(level, ...) \
462  ((level) > vtkLogger::GetCurrentVerbosityCutoff()) \
463  ? (void)0 \
464  : vtkLogger::LogF(level, __FILE__, __LINE__, __VA_ARGS__)
465 #define vtkLogF(verbosity_name, ...) vtkVLogF(vtkLogger::VERBOSITY_##verbosity_name, __VA_ARGS__)
466 #define vtkVLog(level, x) \
467  if ((level) <= vtkLogger::GetCurrentVerbosityCutoff()) \
468  { \
469  vtkOStrStreamWrapper::EndlType endl; \
470  vtkOStrStreamWrapper::UseEndl(endl); \
471  vtkOStrStreamWrapper vtkmsg; \
472  vtkmsg << "" x; \
473  vtkLogger::Log(level, __FILE__, __LINE__, vtkmsg.str()); \
474  vtkmsg.rdbuf()->freeze(0); \
475  }
476 #define vtkLog(verbosity_name, x) vtkVLog(vtkLogger::VERBOSITY_##verbosity_name, x)
478 
480 
492 #define vtkVLogIfF(level, cond, ...) \
493  ((level) > vtkLogger::GetCurrentVerbosityCutoff() || (cond) == false) \
494  ? (void)0 \
495  : vtkLogger::LogF(level, __FILE__, __LINE__, __VA_ARGS__)
496 
497 #define vtkLogIfF(verbosity_name, cond, ...) \
498  vtkVLogIfF(vtkLogger::VERBOSITY_##verbosity_name, cond, __VA_ARGS__)
499 
500 #define vtkVLogIf(level, cond, x) \
501  if ((level) <= vtkLogger::GetCurrentVerbosityCutoff() && (cond)) \
502  { \
503  vtkOStrStreamWrapper::EndlType endl; \
504  vtkOStrStreamWrapper::UseEndl(endl); \
505  vtkOStrStreamWrapper vtkmsg; \
506  vtkmsg << "" x; \
507  vtkLogger::Log(level, __FILE__, __LINE__, vtkmsg.str()); \
508  vtkmsg.rdbuf()->freeze(0); \
509  }
510 #define vtkLogIf(verbosity_name, cond, x) vtkVLogIf(vtkLogger::VERBOSITY_##verbosity_name, cond, x)
512 
513 #define VTKLOG_CONCAT_IMPL(s1, s2) s1##s2
514 #define VTKLOG_CONCAT(s1, s2) VTKLOG_CONCAT_IMPL(s1, s2)
515 #define VTKLOG_ANONYMOUS_VARIABLE(x) VTKLOG_CONCAT(x, __LINE__)
516 
517 #define vtkVLogScopeF(level, ...) \
518  auto VTKLOG_ANONYMOUS_VARIABLE(msg_context) = ((level) > vtkLogger::GetCurrentVerbosityCutoff()) \
519  ? vtkLogger::LogScopeRAII() \
520  : vtkLogger::LogScopeRAII(level, __FILE__, __LINE__, __VA_ARGS__)
521 
522 #define vtkLogScopeF(verbosity_name, ...) \
523  vtkVLogScopeF(vtkLogger::VERBOSITY_##verbosity_name, __VA_ARGS__)
524 
525 #define vtkLogScopeFunction(verbosity_name) vtkLogScopeF(verbosity_name, "%s", __func__)
526 #define vtkVLogScopeFunction(level) vtkVLogScopeF(level, "%s", __func__)
527 
529 
533 #define vtkLogStartScope(verbosity_name, id) \
534  vtkLogger::StartScope(vtkLogger::VERBOSITY_##verbosity_name, id, __FILE__, __LINE__)
535 #define vtkLogEndScope(id) vtkLogger::EndScope(id)
536 
537 #define vtkLogStartScopeF(verbosity_name, id, ...) \
538  vtkLogger::StartScopeF(vtkLogger::VERBOSITY_##verbosity_name, id, __FILE__, __LINE__, __VA_ARGS__)
539 
540 #define vtkVLogStartScope(level, id) vtkLogger::StartScope(level, id, __FILE__, __LINE__)
541 #define vtkVLogStartScopeF(level, id, ...) \
542  vtkLogger::StartScopeF(level, id, __FILE__, __LINE__, __VA_ARGS__)
544 
550 #define vtkLogIdentifier(vtkobject) vtkLogger::GetIdentifier(vtkobject).c_str()
551 
552 #endif
a simple class to control print indentation
Definition: vtkIndent.h:34
LogScopeRAII(vtkLogger::Verbosity verbosity, const char *fname, unsigned int lineno, VTK_FORMAT_STRING_TYPE format,...) VTK_PRINTF_LIKE(5
LogScopeRAII(LogScopeRAII &&)=default
logging framework for use in VTK and in applications based on VTK
Definition: vtkLogger.h:178
static bool EnableUnsafeSignalHandler
Flag to enable/disable the logging frameworks printing of a stack trace when catching signals,...
Definition: vtkLogger.h:433
static Verbosity ConvertToVerbosity(int value)
Convenience function to convert an integer to matching verbosity level.
void(*)(void *user_data) CloseHandlerCallbackT
Callback handle types.
Definition: vtkLogger.h:333
void(*)(void *user_data, const Message &message) LogHandlerCallbackT
Callback handle types.
Definition: vtkLogger.h:332
static bool RemoveCallback(const char *id)
Remove a callback using the id specified.
static std::string GetIdentifier(vtkObjectBase *obj)
Returns a printable string for a vtkObjectBase instance.
static void EndScope(const char *id)
vtkBaseTypeMacro(vtkLogger, vtkObjectBase)
static std::string GetThreadName()
Get/Set the name to identify the current thread in the log output.
static void SetInternalVerbosityLevel(Verbosity level)
Set internal messages verbosity level.
void(*)(void *user_data) FlushHandlerCallbackT
Callback handle types.
Definition: vtkLogger.h:334
static void AddCallback(const char *id, LogHandlerCallbackT callback, void *user_data, Verbosity verbosity, CloseHandlerCallbackT on_close=nullptr, FlushHandlerCallbackT on_flush=nullptr)
Add a callback to call on each log message with a verbosity less or equal to the given one.
static bool IsEnabled()
Returns true if VTK is built with logging support enabled.
static void SetThreadName(const std::string &name)
Get/Set the name to identify the current thread in the log output.
static Verbosity ConvertToVerbosity(const char *text)
Convenience function to convert a string to matching verbosity level.
static void Init()
Initializes logging.
static void EndLogToFile(const char *path)
Stop logging to a file at the given path.
static void Init(int &argc, char *argv[], const char *verbosity_flag="-v")
Initializes logging.
static void Log(Verbosity verbosity, VTK_FILEPATH const char *fname, unsigned int lineno, const char *txt)
static void SetStderrVerbosity(Verbosity level)
Set the verbosity level for the output logged to stderr.
FileMode
Support log file modes: TRUNCATE truncates the file clearing any existing contents while APPEND appen...
Definition: vtkLogger.h:280
static void LogF(Verbosity verbosity, VTK_FILEPATH const char *fname, unsigned int lineno, VTK_FORMAT_STRING_TYPE format,...) VTK_PRINTF_LIKE(4
static Verbosity GetCurrentVerbosityCutoff()
Returns the maximum verbosity of all log outputs.
void PrintSelf(ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses.
static void StartScope(Verbosity verbosity, const char *id, VTK_FILEPATH const char *fname, unsigned int lineno)
~vtkLogger() override
static void LogToFile(const char *path, FileMode filemode, Verbosity verbosity)
Enable logging to a file at the given path.
abstract base class for most VTK objects
Definition: vtkObjectBase.h:70
void operator=(const vtkObjectBase &)
@ level
Definition: vtkX3D.h:401
@ value
Definition: vtkX3D.h:226
@ name
Definition: vtkX3D.h:225
@ string
Definition: vtkX3D.h:496
The message structure that is passed to custom callbacks registered using vtkLogger::AddCallback.
Definition: vtkLogger.h:316
const char * filename
Definition: vtkLogger.h:320
const char * preamble
Definition: vtkLogger.h:322
Verbosity verbosity
Definition: vtkLogger.h:319
const char * message
Definition: vtkLogger.h:325
const char * indentation
Definition: vtkLogger.h:323
const char * prefix
Definition: vtkLogger.h:324
#define VTK_FORMAT_STRING_TYPE
Definition: vtkLogger.h:174
#define VTK_PRINTF_LIKE(fmtarg, firstvararg)
Definition: vtkLogger.h:173
#define VTK_FILEPATH