00214.c (1333B)
1 /* Check some way in where code suppression caused various 2 miscompilations. */ 3 extern int printf (const char *, ...); 4 typedef unsigned long size_t; 5 6 size_t _brk_start, _brk_end; 7 void * extend_brk(size_t size, size_t align) 8 { 9 size_t mask = align - 1; 10 void *ret = 0; 11 12 do { 13 if (__builtin_expect(!!(_brk_start == 0), 0)) 14 do { 15 printf("wrong1\n"); 16 } while (0); 17 } while (0); 18 _brk_end = (_brk_end + mask) & ~mask; 19 ret = (void *)_brk_end; 20 _brk_end += size; 21 22 return ret; 23 } 24 25 static void get_args (int a, int b) 26 { 27 if (a != 1) 28 printf("wrong2\n"); 29 else 30 printf("okay\n"); 31 } 32 33 void bla(void) 34 { 35 int __ret = 42; 36 ({ 37 if (__builtin_expect(!!(0), 0)) { 38 if (__builtin_expect(!!__ret, 0)) 39 printf("wrong3\n"); 40 int x = !!(__ret); 41 } 42 __ret; 43 }); 44 get_args(!!__ret, sizeof(__ret)); 45 } 46 47 _Bool chk(unsigned long addr, unsigned long limit, unsigned long size) 48 { 49 _Bool ret; 50 /* This just needs to compile, no runtime test. (And it doesn't compile 51 only with certain internal checking added that's not committed). */ 52 if (0) 53 ret = 0 != (!!(addr > limit - size)); 54 } 55 56 int main() 57 { 58 void *r; 59 _brk_start = 1024; 60 _brk_end = 1024; 61 r = extend_brk (4096, 16); 62 if (!r) 63 printf("wrong4\n"); 64 else 65 printf("okay\n"); 66 bla(); 67 return 0; 68 }