| 1 | // RUN: %clang_cc1 -std=c++11 -triple x86_64-windows-msvc -verify %s -Wbitfield-enum-conversion |
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| 2 | // RUN: %clang_cc1 -std=c++11 -triple x86_64-linux -verify %s -Wbitfield-enum-conversion |
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| 3 | |
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| 4 | enum TwoBits { Hi1 = 3 } two_bits; |
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| 5 | enum TwoBitsSigned { Lo2 = -2, Hi2 = 1 } two_bits_signed; |
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| 6 | enum ThreeBits { Hi3 = 7 } three_bits; |
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| 7 | enum ThreeBitsSigned { Lo4 = -4, Hi4 = 3 } three_bits_signed; |
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| 8 | enum TwoBitsFixed : unsigned { Hi5 = 3 } two_bits_fixed; |
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| 9 | |
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| 10 | struct Foo { |
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| 11 | unsigned two_bits : 2; // expected-note 2 {{widen this field to 3 bits}} expected-note 2 {{type signed}} |
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| 12 | int two_bits_signed : 2; // expected-note 2 {{widen this field to 3 bits}} expected-note 1 {{type unsigned}} |
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| 13 | unsigned three_bits : 3; // expected-note 2 {{type signed}} |
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| 14 | int three_bits_signed : 3; // expected-note 1 {{type unsigned}} |
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| 15 | |
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| 16 | #ifdef _WIN32 |
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| 17 | // expected-note@+2 {{type unsigned}} |
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| 18 | #endif |
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| 19 | ThreeBits three_bits_enum : 3; |
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| 20 | ThreeBits four_bits_enum : 4; |
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| 21 | }; |
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| 22 | |
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| 23 | void f() { |
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| 24 | Foo f; |
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| 25 | |
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| 26 | f.two_bits = two_bits; |
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| 27 | f.two_bits = two_bits_signed; // expected-warning {{negative enumerators}} |
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| 28 | f.two_bits = three_bits; // expected-warning {{not wide enough}} |
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| 29 | f.two_bits = three_bits_signed; // expected-warning {{negative enumerators}} expected-warning {{not wide enough}} |
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| 30 | f.two_bits = two_bits_fixed; |
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| 31 | |
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| 32 | f.two_bits_signed = two_bits; // expected-warning {{needs an extra bit}} |
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| 33 | f.two_bits_signed = two_bits_signed; |
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| 34 | f.two_bits_signed = three_bits; // expected-warning {{not wide enough}} |
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| 35 | f.two_bits_signed = three_bits_signed; // expected-warning {{not wide enough}} |
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| 36 | |
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| 37 | f.three_bits = two_bits; |
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| 38 | f.three_bits = two_bits_signed; // expected-warning {{negative enumerators}} |
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| 39 | f.three_bits = three_bits; |
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| 40 | f.three_bits = three_bits_signed; // expected-warning {{negative enumerators}} |
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| 41 | |
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| 42 | f.three_bits_signed = two_bits; |
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| 43 | f.three_bits_signed = two_bits_signed; |
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| 44 | f.three_bits_signed = three_bits; // expected-warning {{needs an extra bit}} |
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| 45 | f.three_bits_signed = three_bits_signed; |
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| 46 | |
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| 47 | #ifdef _WIN32 |
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| 48 | // Enums on Windows are always implicitly 'int', which is signed, so you need |
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| 49 | // an extra bit to store values that set the MSB. This is not true on SysV |
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| 50 | // platforms like Linux. |
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| 51 | // expected-warning@+2 {{needs an extra bit}} |
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| 52 | #endif |
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| 53 | f.three_bits_enum = three_bits; |
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| 54 | f.four_bits_enum = three_bits; |
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| 55 | |
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| 56 | // Explicit casts suppress the warning. |
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| 57 | f.two_bits = (unsigned)three_bits_signed; |
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| 58 | f.two_bits = static_cast<unsigned>(three_bits_signed); |
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| 59 | } |
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| 60 | |
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