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Better macros for unreachable code.

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This adds a `CRYB_UNREACHABLE` macro which will cause a segfault if reached, and modifies `CRYB_NO_DEFAULT_CASE` to have essentially the same semantics.  It also removes the conditionals since the coverage macros are always defined.
This commit is contained in:
Dag-Erling Smørgrav 2017-09-04 21:01:39 +02:00
parent 06c2f1280a
commit 636bd7a259
1 changed files with 15 additions and 7 deletions
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22
include/cryb/coverage.h
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@ -45,16 +45,24 @@
#endif
/*
* Use at end of switch which has no default case
* Some switch constructs may leave you trapped between a static analyzer
* that complains about the lack of a default case and a dynamic analyzer
* that complains about dead code. Use this macro at the end of a switch
* that does not need a default case.
*/
#if CRYB_COVERAGE
#define CRYB_NO_DEFAULT_CASE \
CRYB_DISABLE_COVERAGE \
default: \
(void)0; \
break; default: do { *(volatile int *)0 = 0; } while (0) \
CRYB_RESTORE_COVERAGE
/*
* Use wherever a static analyzer is unable to correctly determine that a
* loop will never terminate, an if-else chain will always cover all
* possible cases, etc.
*/
#define CRYB_UNREACHABLE \
CRYB_DISABLE_COVERAGE \
do { *(volatile int *)0 = 0; } while (0) \
CRYB_RESTORE_COVERAGE
#else
#define CRYB_NO_DEFAULT_CASE
#endif
#endif