116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
/* ******************************************************************
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* debug
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* Part of FSE library
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* You can contact the author at :
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* - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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****************************************************************** */
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/*
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* The purpose of this header is to enable debug functions.
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* They regroup assert(), DEBUGLOG() and RAWLOG() for run-time,
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* and DEBUG_STATIC_ASSERT() for compile-time.
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*
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* By default, DEBUGLEVEL==0, which means run-time debug is disabled.
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*
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* Level 1 enables assert() only.
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* Starting level 2, traces can be generated and pushed to stderr.
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* The higher the level, the more verbose the traces.
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*
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* It's possible to dynamically adjust level using variable g_debug_level,
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* which is only declared if DEBUGLEVEL>=2,
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* and is a global variable, not multi-thread protected (use with care)
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*/
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#ifndef DEBUG_H_12987983217
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#define DEBUG_H_12987983217
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/* static assert is triggered at compile time, leaving no runtime artefact.
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* static assert only works with compile-time constants.
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* Also, this variant can only be used inside a function. */
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#define DEBUG_STATIC_ASSERT(c) (void)sizeof(char[(c) ? 1 : -1])
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/* DEBUGLEVEL is expected to be defined externally,
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* typically through compiler command line.
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* Value must be a number. */
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#ifndef DEBUGLEVEL
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# define DEBUGLEVEL 0
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#endif
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/* recommended values for DEBUGLEVEL :
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* 0 : release mode, no debug, all run-time checks disabled
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* 1 : enables assert() only, no display
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* 2 : reserved, for currently active debug path
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* 3 : events once per object lifetime (CCtx, CDict, etc.)
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* 4 : events once per frame
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* 5 : events once per block
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* 6 : events once per sequence (verbose)
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* 7+: events at every position (*very* verbose)
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*
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* It's generally inconvenient to output traces > 5.
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* In which case, it's possible to selectively trigger high verbosity levels
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* by modifying g_debug_level.
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*/
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#if (DEBUGLEVEL>=1)
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# define ZSTD_DEPS_NEED_ASSERT
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# include "zstd_deps.h"
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#else
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# ifndef assert /* assert may be already defined, due to prior #include <assert.h> */
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# define assert(condition) ((void)0) /* disable assert (default) */
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# endif
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#endif
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#if (DEBUGLEVEL>=2)
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# define ZSTD_DEPS_NEED_IO
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# include "zstd_deps.h"
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extern int g_debuglevel; /* the variable is only declared,
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it actually lives in debug.c,
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and is shared by the whole process.
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It's not thread-safe.
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It's useful when enabling very verbose levels
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on selective conditions (such as position in src) */
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# define RAWLOG(l, ...) \
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do { \
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if (l<=g_debuglevel) { \
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ZSTD_DEBUG_PRINT(__VA_ARGS__); \
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} \
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} while (0)
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#define STRINGIFY(x) #x
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#define TOSTRING(x) STRINGIFY(x)
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#define LINE_AS_STRING TOSTRING(__LINE__)
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# define DEBUGLOG(l, ...) \
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do { \
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if (l<=g_debuglevel) { \
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ZSTD_DEBUG_PRINT(__FILE__ ":" LINE_AS_STRING ": " __VA_ARGS__); \
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ZSTD_DEBUG_PRINT(" \n"); \
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} \
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} while (0)
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#else
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# define RAWLOG(l, ...) do { } while (0) /* disabled */
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# define DEBUGLOG(l, ...) do { } while (0) /* disabled */
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#endif
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#if defined (__cplusplus)
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}
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#endif
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#endif /* DEBUG_H_12987983217 */
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