src/include/assert.h

   1 #ifndef _ASSERT_H
   2 #define _ASSERT_H
   3
   4 /** @file
   5  *
   6  * Assertions
   7  *
   8  * This file provides two assertion macros: assert() (for run-time
   9  * assertions) and linker_assert() (for link-time assertions).
  10  *
  11  */
  12
  13 #ifdef NDEBUG
  14 #define ASSERTING 0
  15 #else
  16 #define ASSERTING 1
  17 #endif
  18
  19 /** printf() for assertions
  20  *
  21  * This function exists so that the assert() macro can expand to
  22  * printf() calls without dragging the printf() prototype into scope.
  23  *
  24  * As far as the compiler is concerned, assert_printf() and printf() are
  25  * completely unrelated calls; it's only at the assembly stage that
  26  * references to the assert_printf symbol are collapsed into references
  27  * to the printf symbol.
  28  */
  29 extern int __attribute__ (( format ( printf, 1, 2 ) ))
  30 assert_printf ( const char *fmt, ... ) asm ( "printf" );
  31
  32 /**
  33  * Assert a condition at run-time.
  34  *
  35  * If the condition is not true, a debug message will be printed.
  36  * Assertions only take effect in debug-enabled builds (see DBG()).
  37  *
  38  * @todo Make an assertion failure abort the program
  39  *
  40  */
  41 #define assert( condition )                                                  \
  42         do {                                                                 \
  43                 if ( ASSERTING && ! (condition) ) {                          \
  44                         assert_printf ( "assert(%s) failed at %s line %d\n", \
  45                                         #condition, __FILE__, __LINE__ );    \
  46                 }                                                            \
  47         } while ( 0 )
  48
  49 /**
  50  * Assert a condition at link-time.
  51  *
  52  * If the condition is not true, the link will fail with an unresolved
  53  * symbol (error_symbol).
  54  *
  55  * This macro is gPXE-specific.  Do not use this macro in code
  56  * intended to be portable.
  57  *
  58  */
  59 #define linker_assert( condition, error_symbol )        \
  60         if ( ! (condition) ) {                          \
  61                 extern void error_symbol ( void );      \
  62                 error_symbol();                         \
  63         }
  64
  65 #endif /* _ASSERT_H */