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