gcc/testsuite/gcc.dg/uninit-10.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -Wall" } */
   3 /* On Alpha EV4, dead code elimination and cfg simplification conspired
   4    to leave the register containing 'C' marked live, though all references
   5    to the variable had been removed.  */
   6
   7 struct operand_data
   8 {
   9   struct operand_data *next;
  10   int index;
  11   const char *predicate;
  12   const char *constraint;
  13   int mode;
  14   unsigned char n_alternatives;
  15   char address_p;
  16   char strict_low;
  17   char eliminable;
  18   char seen;
  19 };
  20
  21 struct data
  22 {
  23   struct data *next;
  24   const char *name;
  25   const char *template;
  26   int code_number;
  27   int index_number;
  28   int lineno;
  29   int n_operands;
  30   int n_dups;
  31   int n_alternatives;
  32   int operand_number;
  33   int output_format;
  34   struct operand_data operand[40];
  35 };
  36
  37 extern void message_with_line (int, const char *, ...)
  38      __attribute__ ((__format__ (__printf__, 2, 3)));
  39 extern int have_error;
  40
  41 extern char *strchr (__const char *__s, int __c) __attribute__ ((__pure__));
  42
  43 void
  44 validate_insn_alternatives (d)
  45      struct data *d;
  46 {
  47   int n = 0, start;
  48
  49   for (start = 0; start < d->n_operands; start++)
  50     if (d->operand[start].n_alternatives > 0)
  51       {
  52         int len, i;
  53         const char *p;
  54         char c;  /* { dg-bogus "used uninitialized" "uninitialized variable warning" } */
  55         int which_alternative = 0;
  56         int alternative_count_unsure = 0;
  57
  58         for (p = d->operand[start].constraint; (c = *p); p += len)
  59           {
  60             len = 1;
  61
  62             if (len < 1 || (len > 1 && strchr (",#*+=&%!0123456789", c)))
  63               {
  64                 message_with_line (d->lineno,
  65                                    "invalid length %d for char '%c' in alternative %d of operand %d",
  66                                     len, c, which_alternative, start);
  67                 len = 1;
  68                 have_error = 1;
  69               }
  70
  71             if (c == ',')
  72               {
  73                 which_alternative++;
  74                 continue;
  75               }
  76
  77             for (i = 1; i < len; i++)
  78               if (p[i] == '\0')
  79                 {
  80                   message_with_line (d->lineno,
  81                                      "NUL in alternative %d of operand %d",
  82                                      which_alternative, start);
  83                   alternative_count_unsure = 1;
  84                   break;
  85                 }
  86               else if (strchr (",#*", p[i]))
  87                 {
  88                   message_with_line (d->lineno,
  89                                      "'%c' in alternative %d of operand %d",
  90                                      p[i], which_alternative, start);
  91                   alternative_count_unsure = 1;
  92                 }
  93           }
  94         if (alternative_count_unsure)
  95           have_error = 1;
  96         else if (n == 0)
  97           n = d->operand[start].n_alternatives;
  98         else if (n != d->operand[start].n_alternatives)
  99           {
 100             message_with_line (d->lineno,
 101                                "wrong number of alternatives in operand %d",
 102                                start);
 103             have_error = 1;
 104           }
 105       }
 106
 107
 108   d->n_alternatives = n;
 109 }