Possible stdarg.h bug on Mips Ultrix?

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1 total messages Started by Paul N. Hilfinger Tue, 08 Sep 1992 07:46

#1086

Author: Paul N. Hilfinger
Date: Tue, 08 Sep 1992 07:46

25 lines
1253 bytes

In gcc 2.2.2, stdarg.h includes va-mips.h, which says

    #define va_arg(AP, mode)						\
      ((mode *)(AP = (char *) (__alignof(mode) > 4			\
				    ? ((int)AP + 2*8 - 1) & -8		\
				    : ((int)AP + 2*4 - 1) & -4)))[-1]


(if !lint).  However, under Ultrix V4.2A (Rev. 47) running on a
DecStation, I find the following:

    #ifdef __host_mips

     ...

	    /* va_arg aligns list and points past data */
    #define va_arg(list, mode) ((mode *)(list =\
     (va_list) ((((int)list + (__builtin_alignof(mode)<=4?3:7)) &\
     (__builtin_alignof(mode)<=4?-4:-8))+sizeof(mode))))[-1]

Notice that the va-mips.h code is insensitive to sizeof(mode).  As a
result, passing of sufficiently large structures does not work.  What
is going on?

P. Hilfinger

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