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updated DEBUG_STATIC_ASSERT()

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following suggestion from #1209
This commit is contained in:
Yann Collet 2018-06-26 12:04:59 -07:00
parent b426bcc097
commit f98ec46979
2 changed files with 27 additions and 4 deletions
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22
doc/zstd_manual.html
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@ -872,6 +872,28 @@ size_t ZSTD_decodingBufferSize_min(unsigned long long windowSize, unsigned long
ZSTD_p_forceMaxWindow=1100, </b>/* Force back-reference distances to remain < windowSize,<b>
* even when referencing into Dictionary content (default:0) */
ZSTD_p_forceAttachDict, </b>/* ZSTD supports usage of a CDict in-place<b>
* (avoiding having to copy the compression tables
* from the CDict into the working context). Using
* a CDict in this way saves an initial setup step,
* but comes at the cost of more work per byte of
* input. ZSTD has a simple internal heuristic that
* guesses which strategy will be faster. You can
* use this flag to override that guess.
*
* Note that the by-reference, in-place strategy is
* only used when reusing a compression context
* with compatible compression parameters. (If
* incompatible / uninitialized, the working
* context needs to be cleared anyways, which is
* about as expensive as overwriting it with the
* dictionary context, so there's no savings in
* using the CDict by-ref.)
*
* Values greater than 0 force attaching the dict.
* Values less than 0 force copying the dict.
* 0 selects the default heuristic-guided behavior.
*/
} ZSTD_cParameter;
</b></pre><BR>

9
lib/common/debug.h
View File

@ -35,9 +35,10 @@
/*
* The purpose of this header is to enable debug functions.
* They regroup assert(), DEBUGLOG() and RAWLOG().
* They regroup assert(), DEBUGLOG() and RAWLOG() for run-time,
* and DEBUG_STATIC_ASSERT() for compile-time.
*
* By default, DEBUGLEVEL==0, which means debug is disabled.
* 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.
@ -58,7 +59,7 @@ extern "C" {
/* static assert is triggered at compile time, leaving no runtime artefact,
* but can only work with compile-time constants */
#define DEBUG_STATIC_ASSERT(c) { enum { DEBUG_static_assert = 1/(int)(!!(c)) }; }
#define DEBUG_STATIC_ASSERT(c) { extern char DEBUG_static_assert[(c) ? 1 : -1]; }
/* DEBUGLEVEL is expected to be defined externally,
@ -69,7 +70,7 @@ extern "C" {
#endif
/* recommended values for DEBUGLEVEL :
* 0 : no debug, all functions disabled (except DEBUG_STATIC_ASSERT)
* 0 : no debug, all run-time functions disabled
* 1 : no display, enables assert() only
* 2 : reserved, for currently active debug path
* 3 : events once per object lifetime (CCtx, CDict, etc.)