| // RUN: %clang_cc1 -std=c++11 -triple=x86_64-pc-linux-gnu -fsyntax-only -DUNSIGNED -verify %s |
| // RUN: %clang_cc1 -std=c++11 -triple=x86_64-pc-win32 -fsyntax-only -DSIGNED -verify %s |
| // RUN: %clang_cc1 -std=c++11 -triple=x86_64-pc-win32 -fsyntax-only -DSILENCE -Wno-tautological-unsigned-enum-zero-compare -verify %s |
| |
| // Okay, this is where it gets complicated. |
| // Then default enum sigdness is target-specific. |
| // On windows, it is signed by default. We do not want to warn in that case. |
| |
| int main() { |
| enum A { A_foo = 0, A_bar, }; |
| enum A a; |
| |
| enum B : unsigned { B_foo = 0, B_bar, }; |
| enum B b; |
| |
| enum C : signed { C_foo = 0, C_bar, }; |
| enum C c; |
| |
| #ifdef UNSIGNED |
| if (a < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0 >= a) |
| return 0; |
| if (a > 0) |
| return 0; |
| if (0 <= a) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (a <= 0) |
| return 0; |
| if (0 > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (a >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0 < a) |
| return 0; |
| |
| if (a < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= a) |
| return 0; |
| if (a > 0U) |
| return 0; |
| if (0U <= a) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (a <= 0U) |
| return 0; |
| if (0U > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (a >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < a) |
| return 0; |
| |
| if (b < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0 >= b) |
| return 0; |
| if (b > 0) |
| return 0; |
| if (0 <= b) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (b <= 0) |
| return 0; |
| if (0 > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (b >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0 < b) |
| return 0; |
| |
| if (b < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= b) |
| return 0; |
| if (b > 0U) |
| return 0; |
| if (0U <= b) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (b <= 0U) |
| return 0; |
| if (0U > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (b >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < b) |
| return 0; |
| |
| if (c < 0) |
| return 0; |
| if (0 >= c) // expected-warning {{comparison 0 >= 'enum C' is always true}} |
| return 0; |
| if (c > 0) // expected-warning {{comparison 'enum C' > 0 is always false}} |
| return 0; |
| if (0 <= c) |
| return 0; |
| if (c <= 0) // expected-warning {{comparison 'enum C' <= 0 is always true}} |
| return 0; |
| if (0 > c) |
| return 0; |
| if (c >= 0) |
| return 0; |
| if (0 < c) // expected-warning {{0 < 'enum C' is always false}} |
| return 0; |
| |
| if (c < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= c) |
| return 0; |
| if (c > 0U) |
| return 0; |
| if (0U <= c) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (c <= 0U) |
| return 0; |
| if (0U > c) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (c >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < c) |
| return 0; |
| #elif defined(SIGNED) |
| if (a < 0) |
| return 0; |
| if (0 >= a) // expected-warning {{comparison 0 >= 'enum A' is always true}} |
| return 0; |
| if (a > 0) // expected-warning {{comparison 'enum A' > 0 is always false}} |
| return 0; |
| if (0 <= a) |
| return 0; |
| if (a <= 0) // expected-warning {{comparison 'enum A' <= 0 is always true}} |
| return 0; |
| if (0 > a) |
| return 0; |
| if (a >= 0) |
| return 0; |
| if (0 < a) // expected-warning {{comparison 0 < 'enum A' is always false}} |
| return 0; |
| |
| if (a < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= a) |
| return 0; |
| if (a > 0U) |
| return 0; |
| if (0U <= a) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (a <= 0U) |
| return 0; |
| if (0U > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (a >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < a) |
| return 0; |
| |
| if (b < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0 >= b) |
| return 0; |
| if (b > 0) |
| return 0; |
| if (0 <= b) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (b <= 0) |
| return 0; |
| if (0 > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (b >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0 < b) |
| return 0; |
| |
| if (b < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= b) |
| return 0; |
| if (b > 0U) |
| return 0; |
| if (0U <= b) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (b <= 0U) |
| return 0; |
| if (0U > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (b >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < b) |
| return 0; |
| |
| if (c < 0) |
| return 0; |
| if (0 >= c) // expected-warning {{comparison 0 >= 'enum C' is always true}} |
| return 0; |
| if (c > 0) // expected-warning {{comparison 'enum C' > 0 is always false}} |
| return 0; |
| if (0 <= c) |
| return 0; |
| if (c <= 0) // expected-warning {{comparison 'enum C' <= 0 is always true}} |
| return 0; |
| if (0 > c) |
| return 0; |
| if (c >= 0) |
| return 0; |
| if (0 < c) // expected-warning {{0 < 'enum C' is always false}} |
| return 0; |
| |
| if (c < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= c) |
| return 0; |
| if (c > 0U) |
| return 0; |
| if (0U <= c) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (c <= 0U) |
| return 0; |
| if (0U > c) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (c >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < c) |
| return 0; |
| #else |
| if (a < 0) |
| return 0; |
| if (0 >= a) // expected-warning {{comparison 0 >= 'enum A' is always true}} |
| return 0; |
| if (a > 0) // expected-warning {{comparison 'enum A' > 0 is always false}} |
| return 0; |
| if (0 <= a) |
| return 0; |
| if (a <= 0) // expected-warning {{comparison 'enum A' <= 0 is always true}} |
| return 0; |
| if (0 > a) |
| return 0; |
| if (a >= 0) |
| return 0; |
| if (0 < a) // expected-warning {{comparison 0 < 'enum A' is always false}} |
| return 0; |
| |
| if (a < 0U) |
| return 0; |
| if (0U >= a) |
| return 0; |
| if (a > 0U) |
| return 0; |
| if (0U <= a) |
| return 0; |
| if (a <= 0U) |
| return 0; |
| if (0U > a) |
| return 0; |
| if (a >= 0U) |
| return 0; |
| if (0U < a) |
| return 0; |
| |
| if (b < 0) |
| return 0; |
| if (0 >= b) |
| return 0; |
| if (b > 0) |
| return 0; |
| if (0 <= b) |
| return 0; |
| if (b <= 0) |
| return 0; |
| if (0 > b) |
| return 0; |
| if (b >= 0) |
| return 0; |
| if (0 < b) |
| return 0; |
| |
| if (b < 0U) |
| return 0; |
| if (0U >= b) |
| return 0; |
| if (b > 0U) |
| return 0; |
| if (0U <= b) |
| return 0; |
| if (b <= 0U) |
| return 0; |
| if (0U > b) |
| return 0; |
| if (b >= 0U) |
| return 0; |
| if (0U < b) |
| return 0; |
| |
| if (c < 0) |
| return 0; |
| if (0 >= c) // expected-warning {{comparison 0 >= 'enum C' is always true}} |
| return 0; |
| if (c > 0) // expected-warning {{comparison 'enum C' > 0 is always false}} |
| return 0; |
| if (0 <= c) |
| return 0; |
| if (c <= 0) // expected-warning {{comparison 'enum C' <= 0 is always true}} |
| return 0; |
| if (0 > c) |
| return 0; |
| if (c >= 0) |
| return 0; |
| if (0 < c) // expected-warning {{0 < 'enum C' is always false}} |
| return 0; |
| |
| if (c < 0U) |
| return 0; |
| if (0U >= c) |
| return 0; |
| if (c > 0U) |
| return 0; |
| if (0U <= c) |
| return 0; |
| if (c <= 0U) |
| return 0; |
| if (0U > c) |
| return 0; |
| if (c >= 0U) |
| return 0; |
| if (0U < c) |
| return 0; |
| #endif |
| |
| return 1; |
| } |
| |
| namespace crash_enum_zero_width { |
| int test() { |
| enum A : unsigned { |
| A_foo = 0 |
| }; |
| enum A a; |
| |
| // used to crash in llvm::APSInt::getMaxValue() |
| #ifndef SILENCE |
| if (a < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} |
| #else |
| if (a > 0) |
| #endif |
| return 0; |
| |
| return 1; |
| } |
| } // namespace crash_enum_zero_width |
