| // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only -DUNSIGNED -Wtautological-constant-in-range-compare -verify %s |
| // RUN: %clang_cc1 -triple=x86_64-pc-win32 -fsyntax-only -DSIGNED -Wtautological-constant-in-range-compare -verify %s |
| // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only -DUNSIGNED -DSILENCE -Wno-tautological-constant-compare -verify %s |
| // RUN: %clang_cc1 -triple=x86_64-pc-win32 -fsyntax-only -DSIGNED -DSILENCE -Wno-tautological-constant-compare -verify %s |
| |
| int main() { |
| enum A { A_a = 2 }; |
| enum A a; |
| |
| #ifdef SILENCE |
| // expected-no-diagnostics |
| #else |
| // If we promote to unsigned, it doesn't matter whether the enum's underlying |
| // type was signed. |
| 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 (a < 4294967295U) |
| return 0; |
| if (4294967295U >= a) // expected-warning {{comparison 4294967295 >= 'enum A' is always true}} |
| return 0; |
| if (a > 4294967295U) // expected-warning {{comparison 'enum A' > 4294967295 is always false}} |
| return 0; |
| if (4294967295U <= a) |
| return 0; |
| if (a <= 4294967295U) // expected-warning {{comparison 'enum A' <= 4294967295 is always true}} |
| return 0; |
| if (4294967295U > a) |
| return 0; |
| if (a >= 4294967295U) |
| return 0; |
| if (4294967295U < a) // expected-warning {{comparison 4294967295 < 'enum A' is always false}} |
| return 0; |
| |
| if (a < 2147483647U) |
| return 0; |
| if (2147483647U >= a) |
| return 0; |
| if (a > 2147483647U) |
| return 0; |
| if (2147483647U <= a) |
| return 0; |
| if (a <= 2147483647U) |
| return 0; |
| if (2147483647U > a) |
| return 0; |
| if (a >= 2147483647U) |
| return 0; |
| if (2147483647U < a) |
| return 0; |
| #endif |
| |
| #if defined(UNSIGNED) && !defined(SILENCE) |
| 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 < 4294967295) |
| return 0; |
| if (4294967295 >= a) // expected-warning {{comparison 4294967295 >= 'enum A' is always true}} |
| return 0; |
| if (a > 4294967295) // expected-warning {{comparison 'enum A' > 4294967295 is always false}} |
| return 0; |
| if (4294967295 <= a) |
| return 0; |
| if (a <= 4294967295) // expected-warning {{comparison 'enum A' <= 4294967295 is always true}} |
| return 0; |
| if (4294967295 > a) |
| return 0; |
| if (a >= 4294967295) |
| return 0; |
| if (4294967295 < a) // expected-warning {{comparison 4294967295 < 'enum A' is always false}} |
| return 0; |
| #else // SIGNED || SILENCE |
| if (a < 0) |
| return 0; |
| if (0 >= a) |
| return 0; |
| if (a > 0) |
| return 0; |
| if (0 <= a) |
| return 0; |
| if (a <= 0) |
| return 0; |
| if (0 > a) |
| return 0; |
| if (a >= 0) |
| return 0; |
| if (0 < a) |
| return 0; |
| |
| #ifndef SILENCE |
| if (a < 4294967295) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always true}} |
| return 0; |
| if (4294967295 >= a) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always true}} |
| return 0; |
| if (a > 4294967295) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always false}} |
| return 0; |
| if (4294967295 <= a) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always false}} |
| return 0; |
| if (a <= 4294967295) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always true}} |
| return 0; |
| if (4294967295 > a) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always true}} |
| return 0; |
| if (a >= 4294967295) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always false}} |
| return 0; |
| if (4294967295 < a) // expected-warning {{comparison of constant 4294967295 with expression of type 'enum A' is always false}} |
| return 0; |
| #else |
| if (a < 4294967295) |
| return 0; |
| if (4294967295 >= a) |
| return 0; |
| if (a > 4294967295) |
| return 0; |
| if (4294967295 <= a) |
| return 0; |
| if (a <= 4294967295) |
| return 0; |
| if (4294967295 > a) |
| return 0; |
| if (a >= 4294967295) |
| return 0; |
| if (4294967295 < a) |
| return 0; |
| #endif |
| #endif |
| |
| #if defined(SIGNED) && !defined(SILENCE) |
| if (a < -2147483648) // expected-warning {{comparison 'enum A' < -2147483648 is always false}} |
| return 0; |
| if (-2147483648 >= a) |
| return 0; |
| if (a > -2147483648) |
| return 0; |
| if (-2147483648 <= a) // expected-warning {{comparison -2147483648 <= 'enum A' is always true}} |
| return 0; |
| if (a <= -2147483648) |
| return 0; |
| if (-2147483648 > a) // expected-warning {{comparison -2147483648 > 'enum A' is always false}} |
| return 0; |
| if (a >= -2147483648) // expected-warning {{comparison 'enum A' >= -2147483648 is always true}} |
| return 0; |
| if (-2147483648 < a) |
| return 0; |
| |
| if (a < 2147483647) |
| return 0; |
| if (2147483647 >= a) // expected-warning {{comparison 2147483647 >= 'enum A' is always true}} |
| return 0; |
| if (a > 2147483647) // expected-warning {{comparison 'enum A' > 2147483647 is always false}} |
| return 0; |
| if (2147483647 <= a) |
| return 0; |
| if (a <= 2147483647) // expected-warning {{comparison 'enum A' <= 2147483647 is always true}} |
| return 0; |
| if (2147483647 > a) |
| return 0; |
| if (a >= 2147483647) |
| return 0; |
| if (2147483647 < a) // expected-warning {{comparison 2147483647 < 'enum A' is always false}} |
| return 0; |
| #elif defined(UNSIGNED) && !defined(SILENCE) |
| #ifndef SILENCE |
| if (a < -2147483648) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always false}} |
| return 0; |
| if (-2147483648 >= a) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always false}} |
| return 0; |
| if (a > -2147483648) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always true}} |
| return 0; |
| if (-2147483648 <= a) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always true}} |
| return 0; |
| if (a <= -2147483648) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always false}} |
| return 0; |
| if (-2147483648 > a) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always false}} |
| return 0; |
| if (a >= -2147483648) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always true}} |
| return 0; |
| if (-2147483648 < a) // expected-warning {{comparison of constant -2147483648 with expression of type 'enum A' is always true}} |
| return 0; |
| #else |
| if (a < -2147483648) |
| return 0; |
| if (-2147483648 >= a) |
| return 0; |
| if (a > -2147483648) |
| return 0; |
| if (-2147483648 <= a) |
| return 0; |
| if (a <= -2147483648) |
| return 0; |
| if (-2147483648 > a) |
| return 0; |
| if (a >= -2147483648) |
| return 0; |
| if (-2147483648 < a) |
| return 0; |
| #endif |
| |
| if (a < 2147483647) |
| return 0; |
| if (2147483647 >= a) |
| return 0; |
| if (a > 2147483647) |
| return 0; |
| if (2147483647 <= a) |
| return 0; |
| if (a <= 2147483647) |
| return 0; |
| if (2147483647 > a) |
| return 0; |
| if (a >= 2147483647) |
| return 0; |
| if (2147483647 < a) |
| return 0; |
| #endif |
| |
| return 1; |
| } |
| |
| // https://bugs.llvm.org/show_bug.cgi?id=35009 |
| int PR35009() { |
| enum A { A_a = 2 }; |
| enum A a; |
| |
| // in C, this should not warn. |
| |
| if (a < 1) |
| return 0; |
| if (1 >= a) |
| return 0; |
| if (a > 1) |
| return 0; |
| if (1 <= a) |
| return 0; |
| if (a <= 1) |
| return 0; |
| if (1 > a) |
| return 0; |
| if (a >= 1) |
| return 0; |
| if (1 < a) |
| return 0; |
| if (a == 1) |
| return 0; |
| if (1 != a) |
| return 0; |
| if (a != 1) |
| return 0; |
| if (1 == a) |
| return 0; |
| |
| if (a < 1U) |
| return 0; |
| if (1U >= a) |
| return 0; |
| if (a > 1U) |
| return 0; |
| if (1U <= a) |
| return 0; |
| if (a <= 1U) |
| return 0; |
| if (1U > a) |
| return 0; |
| if (a >= 1U) |
| return 0; |
| if (1U < a) |
| return 0; |
| if (a == 1U) |
| return 0; |
| if (1U != a) |
| return 0; |
| if (a != 1U) |
| return 0; |
| if (1U == a) |
| return 0; |
| |
| if (a < 2) |
| return 0; |
| if (2 >= a) |
| return 0; |
| if (a > 2) |
| return 0; |
| if (2 <= a) |
| return 0; |
| if (a <= 2) |
| return 0; |
| if (2 > a) |
| return 0; |
| if (a >= 2) |
| return 0; |
| if (2 < a) |
| return 0; |
| if (a == 2) |
| return 0; |
| if (2 != a) |
| return 0; |
| if (a != 2) |
| return 0; |
| if (2 == a) |
| return 0; |
| |
| if (a < 2U) |
| return 0; |
| if (2U >= a) |
| return 0; |
| if (a > 2U) |
| return 0; |
| if (2U <= a) |
| return 0; |
| if (a <= 2U) |
| return 0; |
| if (2U > a) |
| return 0; |
| if (a >= 2U) |
| return 0; |
| if (2U < a) |
| return 0; |
| if (a == 2U) |
| return 0; |
| if (2U != a) |
| return 0; |
| if (a != 2U) |
| return 0; |
| if (2U == a) |
| return 0; |
| |
| if (a < 3) |
| return 0; |
| if (3 >= a) |
| return 0; |
| if (a > 3) |
| return 0; |
| if (3 <= a) |
| return 0; |
| if (a <= 3) |
| return 0; |
| if (3 > a) |
| return 0; |
| if (a >= 3) |
| return 0; |
| if (3 < a) |
| return 0; |
| if (a == 3) |
| return 0; |
| if (3 != a) |
| return 0; |
| if (a != 3) |
| return 0; |
| if (3 == a) |
| return 0; |
| |
| if (a < 3U) |
| return 0; |
| if (3U >= a) |
| return 0; |
| if (a > 3U) |
| return 0; |
| if (3U <= a) |
| return 0; |
| if (a <= 3U) |
| return 0; |
| if (3U > a) |
| return 0; |
| if (a >= 3U) |
| return 0; |
| if (3U < a) |
| return 0; |
| if (a == 3U) |
| return 0; |
| if (3U != a) |
| return 0; |
| if (a != 3U) |
| return 0; |
| if (3U == a) |
| return 0; |
| |
| return 1; |
| } |
