gcc/testsuite/c-c++-common/Warray-bounds-10.c

   1 /* PR tree-optimization/99475 - bogus -Warray-bounds accessing an array
   2    element of empty structs
   3    { dg-do compile }
   4    { dg-options "-O2 -Wall" } */
   5
   6 struct S
   7 {
   8 #if SOME_CONFIG_MACRO
   9   /* Suppose the contents are empty in the development configuration
  10      but non-empty in others.  Out of bounds accesses to elements of
  11      the arrays below should be diagnosed in all configurations,
  12      including when S is empty, even if they are folded away.  */
  13   int member;
  14 #endif
  15 };
  16
  17 extern struct S sa3[3];
  18 extern struct S sa2_3[2][3];
  19 extern struct S sa3_4_5[3][4][5];
  20
  21 void sink (void*);
  22
  23
  24 void access_sa3 (struct S s)
  25 {
  26   sa3[0] = s;
  27   sa3[1] = s;
  28   sa3[2] = s;
  29   sa3[3] = s;       // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  30 }
  31
  32 void access_sa3_ptr (struct S s)
  33 {
  34   struct S *p = &sa3[0];
  35
  36   p[0] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  37   p[1] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  38   p[2] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  39   p[3] = s;         // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  40 }
  41
  42 void access_sa2_3_ptr (struct S s)
  43 {
  44   struct S *p = &sa2_3[0][0];
  45
  46   p[0] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  47   p[1] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  48   p[2] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  49   p[6] = s;         // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  50 }
  51
  52 void access_sa3_4_5_ptr (struct S s, int i)
  53 {
  54   struct S *p = &sa3_4_5[0][0][0];
  55
  56   p[0] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  57   p[1] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  58   p[2] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  59   p[60] = s;        // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  60 }
  61
  62
  63 void access_vla3 (struct S s, unsigned n)
  64 {
  65   struct S vla3[3 < n ? 3 : n];
  66
  67   vla3[0] = s;
  68   vla3[1] = s;
  69   vla3[2] = s;
  70   vla3[3] = s;       // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  71
  72   sink (vla3);
  73 }
  74
  75 void access_vla3_ptr (struct S s, unsigned n)
  76 {
  77   struct S vla3[3 < n ? 3 : n];
  78   struct S *p = &vla3[0];
  79
  80   p[0] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  81   p[1] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  82   p[2] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  83   p[3] = s;         // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  84
  85   sink (vla3);
  86 }
  87
  88 void access_vla2_3_ptr (struct S s, unsigned n)
  89 {
  90   struct S vla2_3[2 < n ? 2 : n][3 < n ? 3 : n];
  91   struct S *p = &vla2_3[0][0];
  92
  93   p[0] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  94   p[1] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  95   p[2] = s;         // { dg-bogus "\\\[-Warray-bounds" }
  96   p[6] = s;         // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
  97
  98   sink (vla2_3);
  99 }
 100
 101 void access_vla3_4_5_ptr (struct S s, unsigned n)
 102 {
 103   struct S vla3_4_5[3 < n ? 3 : n][4 < n ? 4 : n][5 < n ? 5 : n];
 104   struct S *p = &vla3_4_5[0][0][0];
 105
 106   p[0] = s;         // { dg-bogus "\\\[-Warray-bounds" }
 107   p[1] = s;         // { dg-bogus "\\\[-Warray-bounds" }
 108   p[2] = s;         // { dg-bogus "\\\[-Warray-bounds" }
 109   p[60] = s;        // { dg-warning "\\\[-Warray-bounds" "pr?????" { xfail *-*-* } }
 110
 111   sink (vla3_4_5);
 112 }
 113
 114 // { dg-prune-output "empty struct has size 0 in C" }