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log: document the assign() macro

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Provide a concise description of the assert() macro. Point out that the
tested expression is always executed, irrespective of the value of _DEBUG.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2019-07-27 20:21:06 +02:00
committed by Tom Rini
parent 102b0b1119
commit b236f8c086
1 changed files with 12 additions and 0 deletions
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12
include/log.h
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@@ -183,6 +183,18 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
*/ */
void __assert_fail(const char *assertion, const char *file, unsigned int line, void __assert_fail(const char *assertion, const char *file, unsigned int line,
const char *function); const char *function);
/**
* assert() - assert expression is true
*
* If the expression x evaluates to false and _DEBUG evaluates to true, a panic
* message is written and the system stalls. The value of _DEBUG is set to true
* if DEBUG is defined before including common.h.
*
* The expression x is always executed irrespective of the value of _DEBUG.
*
* @x: expression to test
*/
#define assert(x) \ #define assert(x) \
({ if (!(x) && _DEBUG) \ ({ if (!(x) && _DEBUG) \
__assert_fail(#x, __FILE__, __LINE__, __func__); }) __assert_fail(#x, __FILE__, __LINE__, __func__); })