gcc/testsuite/gcc.target/i386/iamcu/test_varargs.c

   1 /* Test variable number of arguments passed to functions.  */
   2
   3 #include <stdarg.h>
   4 #include "defines.h"
   5
   6
   7 #define ARG_INT     1
   8 #define ARG_DOUBLE  2
   9 #define ARG_POINTER 3
  10
  11 union types
  12 {
  13   int ivalue;
  14   double dvalue;
  15   void *pvalue;
  16 };
  17
  18 struct arg
  19 {
  20   int type;
  21   union types value;
  22 };
  23
  24 struct arg *arglist;
  25
  26 /* This tests the argumentlist to see if it matches the format string which
  27    is printf-like. Nothing will be printed of course. It can handle ints,
  28    doubles and void pointers. The given value will be tested against the
  29    values given in arglist.
  30    This test only assures that the variable argument passing is working.
  31    No attempt is made to see if argument passing is done the right way.  */
  32 void
  33 __attribute__ ((noinline))
  34 noprintf (char *format, ...)
  35 {
  36   va_list va_arglist;
  37   char *c;
  38
  39   int ivalue;
  40   double dvalue;
  41   void *pvalue;
  42   struct arg *argp = arglist;
  43
  44   va_start (va_arglist, format);
  45   for (c = format; *c; c++)
  46     if (*c == '%')
  47       {
  48         switch (*++c)
  49           {
  50           case 'd':
  51             assert (argp->type == ARG_INT);
  52             ivalue = va_arg (va_arglist, int);
  53             assert (argp->value.ivalue == ivalue);
  54             break;
  55           case 'f':
  56             assert (argp->type == ARG_DOUBLE);
  57             dvalue = va_arg (va_arglist, double);
  58             assert (argp->value.dvalue == dvalue);
  59             break;
  60           case 'p':
  61             assert (argp->type == ARG_POINTER);
  62             pvalue = va_arg (va_arglist, void *);
  63             assert (argp->value.pvalue == pvalue);
  64             break;
  65           default:
  66             abort ();
  67           }
  68
  69         argp++;
  70       }
  71 }
  72
  73 extern void iamcu_noprintf (char *, ...);
  74
  75 int
  76 main (void)
  77 {
  78 #ifdef CHECK_VARARGS
  79   float f = 258.0;
  80   struct arg al[5];
  81
  82   al[0].type = ARG_INT;
  83   al[0].value.ivalue = 256;
  84   al[1].type = ARG_DOUBLE;
  85   al[1].value.dvalue = 257.0;
  86   al[2].type = ARG_POINTER;
  87   al[2].value.pvalue = al;
  88   al[3].type = ARG_DOUBLE;
  89   al[3].value.dvalue = f;
  90   al[4].type = ARG_INT;
  91   al[4].value.ivalue = 259;
  92
  93   arglist = al;
  94   noprintf("%d%f%p%f%d", 256, 257.0, al, f, 259);
  95
  96   iamcu_noprintf ((char *) 0xabadbeef, 256, 257.0,
  97                   (void *) 0xbbadbeef, f, 259);
  98 #endif
  99
 100   return 0;
 101 }