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68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
#ifndef _ASSERT_H
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#define _ASSERT_H
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/** @file
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*
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* Assertions
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*
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* This file provides two assertion macros: assert() (for run-time
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* assertions) and linker_assert() (for link-time assertions).
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#ifdef NDEBUG
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#define ASSERTING 0
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#else
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#define ASSERTING 1
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#endif
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/** printf() for assertions
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*
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* This function exists so that the assert() macro can expand to
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* printf() calls without dragging the printf() prototype into scope.
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*
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* As far as the compiler is concerned, assert_printf() and printf() are
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* completely unrelated calls; it's only at the assembly stage that
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* references to the assert_printf symbol are collapsed into references
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* to the printf symbol.
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*/
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extern int __attribute__ (( format ( printf, 1, 2 ) ))
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assert_printf ( const char *fmt, ... ) asm ( "printf" );
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/**
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* Assert a condition at run-time.
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*
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* If the condition is not true, a debug message will be printed.
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* Assertions only take effect in debug-enabled builds (see DBG()).
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*
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* @todo Make an assertion failure abort the program
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*
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*/
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#define assert( condition ) \
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do { \
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if ( ASSERTING && ! (condition) ) { \
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assert_printf ( "assert(%s) failed at %s line %d\n", \
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#condition, __FILE__, __LINE__ ); \
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} \
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} while ( 0 )
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/**
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* Assert a condition at link-time.
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*
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* If the condition is not true, the link will fail with an unresolved
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* symbol (error_symbol).
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*
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* This macro is iPXE-specific. Do not use this macro in code
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* intended to be portable.
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*
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*/
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#define linker_assert( condition, error_symbol ) \
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if ( ! (condition) ) { \
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extern void error_symbol ( void ); \
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error_symbol(); \
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}
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#endif /* _ASSERT_H */
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