gcc/testsuite/gcc.dg/Wstringop-overflow-40.c

   1 /* PR c/50584 - No warning for passing small array to C99 static array
   2    declarator
   3    { dg-do compile }
   4    { dg-options "-Wall" } */
   5
   6 typedef __INT16_TYPE__ int16_t;
   7
   8 void fa2 (int16_t[2]);
   9 void fxa2 (int16_t[2]) __attribute__ ((nonnull));
  10
  11 void fas2 (int16_t[static 2]);
  12
  13 void fvla (unsigned n, int16_t[n]);
  14
  15 void test_array_1_dim (void)
  16 {
  17   int16_t a1[1];
  18   int16_t a2[2];
  19   int16_t i;
  20
  21   fa2 (0);
  22   fa2 (a2);
  23   fa2 (a1);                   // { dg-warning "'fa2' accessing 4 bytes in a region of size 2 " }
  24   fa2 (&i);                   // { dg-warning "'fa2' accessing 4 bytes in a region of size 2 " }
  25
  26   fxa2 (0);                   // { dg-warning "\\\[-Wnonnull" }
  27   fxa2 (a2);
  28   fxa2 (a1);                  // { dg-warning "'fxa2' accessing 4 bytes in a region of size 2 " }
  29   fxa2 (&i);                  // { dg-warning "'fxa2' accessing 4 bytes in a region of size 2 " }
  30
  31   fas2 (0);                   // { dg-warning "\\\[-Wnonnull" }
  32   fas2 (a2);
  33   fas2 (a1);                  // { dg-warning "'fas2' accessing 4 bytes in a region of size 2 " }
  34   fas2 (&i);                  // { dg-warning "'fas2' accessing 4 bytes in a region of size 2 " }
  35
  36   fvla (1, 0);                // { dg-warning "\\\[-Wnonnull" }
  37   fvla (1, &i);
  38   fvla (2, a2);
  39   fvla (2, a1);               // { dg-warning "'fvla' accessing 4 bytes in a region of size 2 " }
  40   fvla (2, &i);               // { dg-warning "'fvla' accessing 4 bytes in a region of size 2 " }
  41 }
  42
  43
  44 void fac2 (const int16_t[2]);
  45 void fxac2 (const int16_t[2]) __attribute__ ((nonnull));
  46
  47 void facs2 (const int16_t[static 2]);
  48
  49 void fvlac (unsigned n, const int16_t[n]);
  50
  51 void test_const_array_1_dim (void)
  52 {
  53   int16_t a1[1];
  54   int16_t a2[2];
  55   int16_t i;
  56
  57   fac2 (0);
  58   fac2 (a2);
  59   fac2 (a1);                  // { dg-warning "'fac2' reading 4 bytes from a region of size 2 " }
  60   fac2 (&i);                  // { dg-warning "'fac2' reading 4 bytes from a region of size 2 " }
  61
  62   fxac2 (0);                  // { dg-warning "\\\[-Wnonnull" }
  63   fxac2 (a2);
  64   fxac2 (a1);                 // { dg-warning "'fxac2' reading 4 bytes from a region of size 2 " }
  65   fxac2 (&i);                 // { dg-warning "'fxac2' reading 4 bytes from a region of size 2 " }
  66
  67   facs2 (0);                  // { dg-warning "\\\[-Wnonnull" }
  68   facs2 (a2);
  69   facs2 (a1);                 // { dg-warning "'facs2' reading 4 bytes from a region of size 2 " }
  70   facs2 (&i);                 // { dg-warning "'facs2' reading 4 bytes from a region of size 2 " }
  71
  72   fvlac (1, 0);               // { dg-warning "\\\[-Wnonnull" }
  73   fvlac (1, &i);
  74   fvlac (2, a2);
  75   fvlac (2, a1);              // { dg-warning "'fvlac' reading 4 bytes from a region of size 2 " }
  76   fvlac (2, &i);              // { dg-warning "'fvlac' reading 4 bytes from a region of size 2 " }
  77 }
  78
  79
  80 void fca3x5 (int16_t[3][5]);
  81 void fcas5x7 (int16_t[static 5][7]);
  82
  83 struct Snx5 { int16_t a3x5[3][5], a2x5[2][5], a1x5[1][5]; };
  84 struct Snx7 { int16_t a5x7[5][7], a4x7[4][7], a1x7[1][7]; };
  85 struct S0x7 { int x; int16_t a0x7[0][7]; };
  86
  87 void test_array_2_dim (struct Snx5 *px5, struct Snx7 *px7, struct S0x7 *p0x7)
  88 {
  89   int16_t a0x5[0][5], a1x5[1][5], a2x5[2][5], a3x5[3][5], a4x5[4][5];
  90
  91   fca3x5 (a3x5);
  92   fca3x5 (a4x5);
  93   fca3x5 (a2x5);              // { dg-warning "'fca3x5' accessing 30 bytes in a region of size 20" }
  94   fca3x5 (a1x5);              // { dg-warning "'fca3x5' accessing 30 bytes in a region of size 10" }
  95   fca3x5 (a0x5);              // { dg-warning "'fca3x5' accessing 30 bytes in a region of size 0" }
  96
  97   fca3x5 (px5->a3x5);
  98   fca3x5 (px5->a2x5);         // { dg-warning "'fca3x5' accessing 30 bytes in a region of size 20" }
  99   fca3x5 (px5->a1x5);         // { dg-warning "'fca3x5' accessing 30 bytes in a region of size 10" "pr96346" { xfail *-*-* } }
 100
 101   {
 102     int16_t (*pa2x5)[5] = &a2x5[0];
 103     fca3x5 (pa2x5);           // { dg-warning "'fca3x5' accessing 30 bytes in a region of size 10" }
 104     ++pa2x5;
 105     fca3x5 (pa2x5);           // { dg-warning "'fca3x5' accessing 30 bytes " }
 106   }
 107
 108   int16_t a0x7[0][7], a1x7[1][7], a4x7[4][7], a5x7[5][7], a99x7[99][7];
 109   fcas5x7 (a99x7);
 110   fcas5x7 (a5x7);
 111   fcas5x7 (a4x7);             // { dg-warning "'fcas5x7' accessing 70 bytes in a region of size 56" }
 112   fcas5x7 (a1x7);             // { dg-warning "'fcas5x7' accessing 70 bytes in a region of size 14" }
 113   fcas5x7 (a0x7);             // { dg-warning "'fcas5x7' accessing 70 bytes in a region of size 0" }
 114
 115   fcas5x7 (px7->a5x7);
 116   fcas5x7 (px7->a4x7);        // { dg-warning "'fcas5x7' accessing 70 bytes in a region of size 56" }
 117   fcas5x7 (px7->a1x7);        // { dg-warning "'fcas5x7' accessing 70 bytes in a region of size 14" "pr96346" { xfail *-*-* } }
 118
 119   fcas5x7 (p0x7->a0x7);       // { dg-warning "'fcas5x7' accessing 70 bytes in a region of size 0" "pr96346" { xfail *-*-* } }
 120 }