gcc/testsuite/gcc.dg/sequence-pt-1.c

   1 /* Test for sequence point warnings.  */
   2 /* Origin: Michael Meeks in
   3    <URL:http://gcc.gnu.org/ml/gcc-patches/1998-06/msg00316.html>,
   4    adapted to a testcase by Joseph Myers <jsm28@cam.ac.uk>.  */
   5 /* { dg-do compile } */
   6 /* { dg-options "-Wsequence-point" } */
   7
   8 struct s
   9 {
  10   int a;
  11 };
  12
  13 extern int fn (int);
  14 extern int fnb (int, int);
  15 extern int fnc (int *);
  16 extern int sprintf (char *, const char *, ...);
  17
  18 typedef __SIZE_TYPE__ size_t;
  19
  20 void
  21 foo (int a, int b, int n, int p, int *ptr, struct s *sptr,
  22      int *ap, int *bp, int **cp, char *ans, int (*fnp[8])(int))
  23 {
  24   int len;
  25
  26   a = a++; /* { dg-warning "undefined" "sequence point warning" } */
  27   a = --a; /* { dg-warning "undefined" "sequence point warning" } */
  28   a = ++a + b; /* { dg-warning "undefined" "sequence point warning" } */
  29   a = a-- + b; /* { dg-warning "undefined" "sequence point warning" } */
  30   ap[n] = bp[n++]; /* { dg-warning "undefined" "sequence point warning" } */
  31   ap[--n] = bp[n]; /* { dg-warning "undefined" "sequence point warning" } */
  32   ap[++n] = bp[--n]; /* { dg-warning "undefined" "sequence point warning" } */
  33   cp[n][n] = cp[n][n]++; /* { dg-warning "undefined" "sequence point warning" { xfail *-*-* } } */
  34   cp[n][p] = cp[n][n++]; /* { dg-warning "undefined" "sequence point warning" } */
  35   *ptr++ = (size_t)ptr++; /* { dg-warning "undefined" "sequence point warning" } */
  36   sptr->a = sptr->a++; /* { dg-warning "undefined" "sequence point warning" { xfail *-*-* } } */
  37   sptr->a = (size_t)(sptr++); /* { dg-warning "undefined" "sequence point warning" } */
  38   *ptr++ = fn (*ptr); /* { dg-warning "undefined" "sequence point warning" } */
  39   a = b = a++; /* { dg-warning "undefined" "sequence point warning" } */
  40   b = a = --b; /* { dg-warning "undefined" "sequence point warning" } */
  41   a = 1 + (a = 1); /* { dg-warning "undefined" "sequence point warning" } */
  42   a = (a = b); /* { dg-warning "undefined" "sequence point warning" } */
  43   a = (a = b) + 1; /* { dg-warning "undefined" "sequence point warning" } */
  44   a = (bp[a++] = b) + 1; /* { dg-warning "undefined" "sequence point warning" } */
  45   a = b++ * b++; /* { dg-warning "undefined" "sequence point warning" } */
  46   a = fnb (b++, b++); /* { dg-warning "undefined" "sequence point warning" } */
  47   a = (*fnp[b++]) (b++); /* { dg-warning "undefined" "sequence point warning" } */
  48   a = (*fnp[b]) (b++); /* { dg-warning "undefined" "sequence point warning" } */
  49   a = (*fnp[b++]) (b); /* { dg-warning "undefined" "sequence point warning" } */
  50   *ap = fnc (ap++); /* { dg-warning "undefined" "sequence point warning" } */
  51   (a += b) + (a += n); /* { dg-warning "undefined" "sequence point warning" } */
  52   a =  (b, b++) + (b++, b); /* { dg-warning "undefined" "sequence point warning" } */
  53   ap[a++] += a; /* { dg-warning "undefined" "sequence point warning" } */
  54   ap[a+=1] += a; /* { dg-warning "undefined" "sequence point warning" } */
  55   ap[a++] += a++; /* { dg-warning "undefined" "sequence point warning" } */
  56   ap[a+=1] += a++; /* { dg-warning "undefined" "sequence point warning" } */
  57   a = a++, b = a; /* { dg-warning "undefined" "sequence point warning" } */
  58   b = a, a = a++; /* { dg-warning "undefined" "sequence point warning" } */
  59   a = (b++ ? n : a) + b; /* { dg-warning "undefined" "sequence point warning" { xfail *-*-* } } */
  60   b ? a = a++ : a; /* { dg-warning "undefined" "sequence point warning" } */
  61   b ? a : a = a++; /* { dg-warning "undefined" "sequence point warning" } */
  62   b && (a = a++); /* { dg-warning "undefined" "sequence point warning" } */
  63   (a = a++) && b; /* { dg-warning "undefined" "sequence point warning" } */
  64   b, (a = a++); /* { dg-warning "undefined" "sequence point warning" } */
  65   (a = a++), b; /* { dg-warning "undefined" "sequence point warning" } */
  66   a ^= b ^= a ^= b; /* { dg-warning "undefined" "sequence point warning" } */
  67
  68   a = a; /* { dg-bogus "undefined" "bogus sequence point warning" } */
  69   a = (a++ && 4); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  70   a = ! (a++ && 4); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  71   a = - (a++ && 4); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  72   a = (double) (a++ && 4); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  73   len = sprintf (ans, "%d", len++); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  74   a = fn (a++); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  75   b++, (b + b); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  76   (a = b++), (a = b++); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  77   a = (b++, b++); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  78   a = b++ && b++; /* { dg-bogus "undefined" "bogus sequence point warning" } */
  79   a = b++ || b++; /* { dg-bogus "undefined" "bogus sequence point warning" } */
  80   a = (b++ ? b++ : a); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  81   a = (b++ ? a : b++); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  82   ap[a++] += bp[b]; /* { dg-bogus "undefined" "bogus sequence point warning" } */
  83   ap[a += 1] += 1; /* { dg-bogus "undefined" "bogus sequence point warning" } */
  84   *ptr < 128 ? *ptr++ : *(ptr += 2); /* { dg-bogus "undefined" "bogus sequence point warning" } */
  85
  86   /* The following will be represented internally with a tree consisting of
  87      many duplicated SAVE_EXPRs.  This caused the previous version of the
  88      sequence point warning code to fail by running out of virtual memory.  */
  89   a = ((b & 1 ? 21 : 0)
  90        | (b & 2 ? 22 : 0)
  91        | (b & 3 ? 23 : 0)
  92        | (b & 4 ? 24 : 0)
  93        | (b & 5 ? 25 : 0)
  94        | (b & 6 ? 26 : 0)
  95        | (b & 7 ? 27 : 0)
  96        | (b & 8 ? 28 : 0)
  97        | (b & 9 ? 29 : 0)
  98        | (b & 10 ? 30 : 0)
  99        | (b & 11 ? 31 : 0)
 100        | (b & 12 ? 32 : 0)
 101        | (b & 13 ? 1 : 0)
 102        | (b & 14 ? 2 : 0)
 103        | (b & 15 ? 3 : 0)
 104        | (b & 16 ? 4 : 0)
 105        | (b & 17 ? 5 : 0)
 106        | (b & 18 ? 6 : 0)
 107        | (b & 19 ? 7 : 0)
 108        | (b & 20 ? 8 : 0)
 109        | (b & 21 ? 9 : 0));
 110 }