diff options
Diffstat (limited to 'gcc-4.9/gcc/testsuite/c-c++-common/ubsan/overflow-sub-1.c')
-rw-r--r-- | gcc-4.9/gcc/testsuite/c-c++-common/ubsan/overflow-sub-1.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/c-c++-common/ubsan/overflow-sub-1.c b/gcc-4.9/gcc/testsuite/c-c++-common/ubsan/overflow-sub-1.c new file mode 100644 index 000000000..15f04455e --- /dev/null +++ b/gcc-4.9/gcc/testsuite/c-c++-common/ubsan/overflow-sub-1.c @@ -0,0 +1,69 @@ +/* { dg-do run } */ +/* { dg-options "-fsanitize=signed-integer-overflow -Wno-unused-variable" } */ + +#include <stdio.h> + +#define SCHAR_MAX __SCHAR_MAX__ +#define SCHAR_MIN (-__SCHAR_MAX__ - 1) +#define SHRT_MAX __SHRT_MAX__ +#define SHRT_MIN (-__SHRT_MAX__ - 1) +#define INT_MAX __INT_MAX__ +#define INT_MIN (-__INT_MAX__ - 1) + +void __attribute__((noinline,noclone)) +check (int i, int j) +{ + if (i != j) + __builtin_abort (); +} + +int +main (void) +{ + fputs ("UBSAN TEST START\n", stderr); + +#if __INT_MAX__ == 2147483647 + /* Here, nothing should fail. */ + volatile int i = -1; + volatile int j = INT_MIN; + volatile int k = j - i; + check (k, -2147483647); + k = i - j; + check (k, 2147483647); + j++; + check (j, -2147483647); + + i = 1; + j = INT_MAX; + k = i - j; + check (k, -2147483646); + k = j - i; + check (k, 2147483646); + j--; + check (k, 2147483646); +#endif + + /* Test integer promotion. */ +#if __SCHAR_MAX__ == 127 + volatile signed char a = SCHAR_MIN; + volatile signed char b = 1; + volatile signed char c = a - b; + check (c, 127); + a--; + check (a, 127); +#endif + +#if __SHRT_MAX__ == 32767 + volatile short d = SHRT_MIN; + volatile short e = 1; + volatile short f = d - e; + check (f, 32767); + d--; + check (d, 32767); +#endif + + fputs ("UBSAN TEST END\n", stderr); + return 0; +} + +/* { dg-output "UBSAN TEST START(\n|\r\n|\r)UBSAN TEST END" } */ |