1 | // RUN: %clang -fsanitize=implicit-unsigned-integer-truncation %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK |
2 | |
3 | #include <stdint.h> |
4 | |
5 | int main() { |
6 | // CHECK-NOT: implicit-conversion |
7 | |
8 | // Negative tests. Even if they produce unexpected results, this sanitizer does not care. |
9 | int8_t n0 = (~((uint32_t)(0))); // ~0 -> -1, but do not warn. |
10 | uint8_t n2 = 128; |
11 | uint8_t n3 = 255; |
12 | // Bools do not count |
13 | _Bool b0 = (~((uint32_t)(0))); |
14 | _Bool b1 = 255; |
15 | |
16 | // Explicit and-ing of bits will silence it. |
17 | uint8_t nc0 = ((~((uint32_t)(0))) & 255); |
18 | |
19 | // Positive tests. |
20 | uint8_t t0 = (~((uint32_t)(0))); |
21 | // CHECK: implicit-conversion by 0x{{[[:xdigit:]]+$}} |
22 | // CHECK-NOT: implicit-conversion |
23 | |
24 | return 0; |
25 | } |
26 | |