34 lines · cpp
1// RUN: %clang_cc1 %s -verify2// RUN: %clang_cc1 %s -verify -Wms-bitfield-padding 3 4// expected-no-diagnostics5 6namespace PromotionVersusMutation {7 typedef unsigned Unsigned;8 typedef signed Signed;9 10 struct T { unsigned n : 2; } t;11 12 typedef __typeof__(t.n) Unsigned; // Bitfield is unsigned13 typedef __typeof__(+t.n) Signed; // ... but promotes to signed.14 15 typedef __typeof__(t.n + 0) Signed; // Arithmetic promotes.16 17 typedef __typeof__(t.n = 0) Unsigned; // Assignment produces an lvalue...18 typedef __typeof__(t.n += 0) Unsigned;19 typedef __typeof__(t.n *= 0) Unsigned;20 typedef __typeof__(+(t.n = 0)) Signed; // ... which is a bit-field.21 typedef __typeof__(+(t.n += 0)) Signed;22 typedef __typeof__(+(t.n *= 0)) Signed;23 24 typedef __typeof__(++t.n) Unsigned; // Increment is equivalent to compound-assignment.25 typedef __typeof__(--t.n) Unsigned;26 typedef __typeof__(+(++t.n)) Signed;27 typedef __typeof__(+(--t.n)) Signed;28 29 typedef __typeof__(t.n++) Unsigned; // Post-increment's result has the type30 typedef __typeof__(t.n--) Unsigned; // of the operand...31 typedef __typeof__(+(t.n++)) Unsigned; // ... and is not a bit-field (because32 typedef __typeof__(+(t.n--)) Unsigned; // it's not a glvalue).33}34