1// PR tree-optimization/27549 2// { dg-do compile } 3// { dg-options "-O2" } 4 5typedef __SIZE_TYPE__ size_t; 6 7struct E 8{ 9 virtual ~E () {} 10 virtual size_t e () const = 0; 11 virtual void f (char *x) const = 0; 12}; 13 14struct 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 21struct 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 67const char *p; 68size_t q; 69const F u; 70 71const char * 72foo () 73{ 74 S s; 75 s.s (p, q); 76 s.s (&u); 77 return s.t (); 78} 79