gcc/testsuite/g++.dg/tree-ssa/pr27549.C

   1 // PR tree-optimization/27549
   2 // { dg-do compile }
   3 // { dg-options "-O2" }
   4
   5 typedef __SIZE_TYPE__ size_t;
   6
   7 struct E
   8 {
   9   virtual ~E () {}
  10   virtual size_t e () const = 0;
  11   virtual void f (char *x) const = 0;
  12 };
  13
  14 struct F : public E
  15 {
  16   virtual ~F () {}
  17   virtual size_t e () const { return 0; }
  18   virtual void f (char *x) const { *x = '\0'; }
  19 };
  20
  21 struct S
  22 {
  23   S () { a = new char[32]; b = 32; c = 0; a[0] = 0; }
  24   void s (const char *x, size_t y) { v (c + y + 1); __builtin_memcpy(a + c, x, y); c += y; a[c] = '\0'; }
  25   void s (const E *x) { size_t l = x->e(); v (c + l + 1); x->f (a + c); c += l; }
  26   const char *t () { return a; }
  27   void v (size_t n)
  28     {
  29       if (b >= n) return;
  30
  31       size_t b2 = b;
  32       char *a2 = a;
  33
  34       for (;;)
  35         {
  36           b *= 2;
  37           if (b >= n)
  38             break;
  39         }
  40
  41       a = new char[b];
  42
  43       if (b2)
  44         {
  45           __builtin_memcpy(a, a2, c);
  46           a2[0] = 0;
  47           for (size_t i = 1; i < b2; i++)
  48             a2[i] = a2[i - 1];
  49           delete[] a2;
  50         }
  51     }
  52
  53   ~S ()
  54     {
  55       if (b)
  56         {
  57           a[0] = 0;
  58           for (size_t i = 1; i < b; i++)
  59             a[i] = a[i - 1];
  60         }
  61       delete[] a;
  62     }
  63   char * a;
  64   size_t b, c;
  65 };
  66
  67 const char *p;
  68 size_t q;
  69 const F u;
  70
  71 const char *
  72 foo ()
  73 {
  74   S s;
  75   s.s (p, q);
  76   s.s (&u);
  77   return s.t ();
  78 }