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| 1 | +// RUN: %clang_cc1 -verify -triple x86_64-unknown-linux-gnu -fsyntax-only -std=c23 %s -pedantic -Wall |
| 2 | + |
| 3 | +#include <limits.h> |
| 4 | + |
| 5 | +enum us : unsigned short { |
| 6 | + us_max = USHRT_MAX, |
| 7 | + us_violation, // expected-error {{enumerator value 65536 is not representable in the underlying type 'unsigned short'}} |
| 8 | + us_violation_2 = us_max + 1, // expected-error {{enumerator value is not representable in the underlying type 'unsigned short'}} |
| 9 | + us_wrap_around_to_zero = (unsigned short)(USHRT_MAX + 1) /* Okay: conversion |
| 10 | + done in constant expression before conversion to |
| 11 | + underlying type: unsigned semantics okay. */ |
| 12 | +}; |
| 13 | + |
| 14 | +enum ui : unsigned int { |
| 15 | + ui_max = UINT_MAX, |
| 16 | + ui_violation, // expected-error {{enumerator value 4294967296 is not representable in the underlying type 'unsigned int'}} |
| 17 | + ui_no_violation = ui_max + 1, |
| 18 | + ui_wrap_around_to_zero = (unsigned int)(UINT_MAX + 1) |
| 19 | +}; |
| 20 | + |
| 21 | +enum E1 : short; |
| 22 | +enum E2 : short; // expected-note {{previous}} |
| 23 | +enum E3; // expected-warning {{ISO C forbids forward references to 'enum' types}} |
| 24 | +enum E4 : unsigned long long; |
| 25 | + |
| 26 | +enum E1 : short { m11, m12 }; |
| 27 | +enum E1 x = m11; |
| 28 | + |
| 29 | +enum E2 : long { // expected-error {{enumeration redeclared with different underlying type 'long' (was 'short')}} |
| 30 | + m21, |
| 31 | + m22 |
| 32 | +}; |
| 33 | + |
| 34 | +enum E3 { // expected-note {{definition of 'enum E3' is not complete until the closing '}'}} |
| 35 | + // expected-note@-1 {{previous}} |
| 36 | + m31, |
| 37 | + m32, |
| 38 | + m33 = sizeof(enum E3) // expected-error {{invalid application of 'sizeof' to an incomplete type 'enum E3'}} |
| 39 | +}; |
| 40 | +enum E3 : int; // expected-error {{enumeration previously declared with nonfixed underlying type}} |
| 41 | + |
| 42 | +enum E4 : unsigned long long { |
| 43 | + m40 = sizeof(enum E4), |
| 44 | + m41 = ULLONG_MAX, |
| 45 | + m42 // expected-error {{enumerator value 18446744073709551616 is not representable in the underlying type 'unsigned long long'}} |
| 46 | +}; |
| 47 | + |
| 48 | +enum E5 y; // expected-error {{tentative definition has type 'enum E5' that is never completed}} |
| 49 | + // expected-warning@-1 {{ISO C forbids forward references to 'enum' types}} |
| 50 | + // expected-note@-2 {{forward declaration of 'enum E5'}} |
| 51 | +enum E6 : long int z; // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 52 | +enum E7 : long int = 0; // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 53 | + // expected-error@-1 {{expected identifier or '('}} |
| 54 | + |
| 55 | +enum underlying : unsigned char { b0 }; |
| 56 | + |
| 57 | +constexpr int a = _Generic(b0, int: 2, unsigned char: 1, default: 0); |
| 58 | +constexpr int b = _Generic((enum underlying)b0, int: 2, unsigned char: 1, default: 0); |
| 59 | +static_assert(a == 1); |
| 60 | +static_assert(b == 1); |
| 61 | + |
| 62 | +void f1(enum a : long b); // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 63 | + // expected-warning@-1 {{declaration of 'enum a' will not be visible outside of this function}} |
| 64 | +void f2(enum c : long{x} d); // expected-warning {{declaration of 'enum c' will not be visible outside of this function}} |
| 65 | +enum e : int f3(); // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 66 | + |
| 67 | +typedef enum t u; // expected-warning {{ISO C forbids forward references to 'enum' types}} |
| 68 | +typedef enum v : short W; // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 69 | +typedef enum q : short { s } R; |
| 70 | + |
| 71 | +struct s1 { |
| 72 | + int x; |
| 73 | + enum e:int : 1; // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 74 | + int y; |
| 75 | +}; |
| 76 | + |
| 77 | +enum forward; // expected-warning {{ISO C forbids forward references to 'enum' types}} |
| 78 | +extern enum forward fwd_val0; /* Constraint violation: incomplete type */ |
| 79 | +extern enum forward *fwd_ptr0; // expected-note {{previous}} |
| 80 | +extern int |
| 81 | + *fwd_ptr0; // expected-error {{redeclaration of 'fwd_ptr0' with a different type: 'int *' vs 'enum forward *'}} |
| 82 | + |
| 83 | +enum forward1 : int; |
| 84 | +extern enum forward1 fwd_val1; |
| 85 | +extern int fwd_val1; |
| 86 | +extern enum forward1 *fwd_ptr1; |
| 87 | +extern int *fwd_ptr1; |
| 88 | + |
| 89 | +enum ee1 : short; |
| 90 | +enum e : short f = 0; // expected-error {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}} |
| 91 | +enum g : short { yyy } h = yyy; |
| 92 | + |
| 93 | +enum ee2 : typeof ((enum ee3 : short { A })0, (short)0); |
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