(stabs.info.gz) Macro define and undefine

 
 6 Representation of #define and #undef
 **************************************
 
 This section describes the stabs support for macro define and undefine
 information, supported on some systems.  (e.g., with `-g3' `-gstabs'
 when using GCC).
 
    A `#define MACRO-NAME MACRO-BODY' is represented with an
 `N_MAC_DEFINE' stab with a string field of `MACRO-NAME MACRO-BODY'.  
 
    An `#undef MACRO-NAME' is represented with an `N_MAC_UNDEF' stabs
 with a string field of simply `MACRO-NAME'.  
 
    For both `N_MAC_DEFINE' and `N_MAC_UNDEF', the desc field is the
 line number within the file where the corresponding `#define' or
 `#undef' occurred.
 
    For example, the following C code:
 
          #define NONE	42
          #define TWO(a, b)	(a + (a) + 2 * b)
          #define ONE(c)	(c + 19)
 
          main(int argc, char *argv[])
          {
            func(NONE, TWO(10, 11));
            func(NONE, ONE(23));
 
          #undef ONE
          #define ONE(c)	(c + 23)
 
            func(NONE, ONE(-23));
 
            return (0);
          }
 
          int global;
 
          func(int arg1, int arg2)
          {
            global = arg1 + arg2;
          }
 
 produces the following stabs (as well as many others):
 
          .stabs	"NONE 42",54,0,1,0
          .stabs	"TWO(a,b) (a + (a) + 2 * b)",54,0,2,0
          .stabs	"ONE(c) (c + 19)",54,0,3,0
          .stabs	"ONE",58,0,10,0
          .stabs	"ONE(c) (c + 23)",54,0,11,0
 
 NOTE: In the above example, `54' is `N_MAC_DEFINE' and `58' is
 `N_MAC_UNDEF'.

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