92 lines · c
1// RUN: %clang_cc1 %s -fsyntax-only -Wno-strict-prototypes -verify -pedantic -std=c112// RUN: %clang_cc1 %s -fsyntax-only -Wno-strict-prototypes -verify -pedantic -std=c11 -fexperimental-new-constant-interpreter3 4__auto_type a = 5; // expected-warning {{'__auto_type' is a GNU extension}}5__extension__ __auto_type a1 = 5;6#pragma clang diagnostic ignored "-Wgnu-auto-type"7__auto_type b = 5.0;8__auto_type c = &b;9__auto_type d = (struct {int a;}) {5};10_Static_assert(__builtin_types_compatible_p(__typeof(a), int), "");11__auto_type e = e; // expected-error {{variable 'e' declared with deduced type '__auto_type' cannot appear in its own initializer}}12 13struct s { __auto_type a; }; // expected-error {{'__auto_type' not allowed in struct member}}14 15__auto_type f = 1, g = 1.0; // expected-error {{'__auto_type' deduced as 'int' in declaration of 'f' and deduced as 'double' in declaration of 'g'}}16 17__auto_type h() {} // expected-error {{'__auto_type' not allowed in function return type}}18 19int i() {20 struct bitfield { int field:2; };21 __auto_type j = (struct bitfield){1}.field; // expected-error {{cannot pass bit-field as __auto_type initializer in C}}22 23}24 25int k(l)26__auto_type l; // expected-error {{'__auto_type' not allowed in K&R-style function parameter}}27{}28 29void Issue53652(void) {30 // Ensure that qualifiers all work the same way as GCC.31 const __auto_type cat = a;32 const __auto_type pcat = &a;33 volatile __auto_type vat = a;34 volatile __auto_type pvat = &a;35 restrict __auto_type rat = &a;36 _Atomic __auto_type aat1 = a;37 _Atomic __auto_type paat = &a;38 39 // GCC does not accept this either, for the same reason.40 _Atomic(__auto_type) aat2 = a; // expected-error {{'__auto_type' not allowed here}} \41 // expected-error {{type specifier missing, defaults to 'int'}}42 43 // Ensure the types are what we expect them to be, regardless of order we44 // pass the types.45 _Static_assert(__builtin_types_compatible_p(__typeof(cat), const int), "");46 _Static_assert(__builtin_types_compatible_p(const int, __typeof(cat)), "");47 _Static_assert(__builtin_types_compatible_p(__typeof(pcat), int *const), "");48 _Static_assert(__builtin_types_compatible_p(int *const, __typeof(pcat)), "");49 _Static_assert(__builtin_types_compatible_p(__typeof(vat), volatile int), "");50 _Static_assert(__builtin_types_compatible_p(volatile int, __typeof(vat)), "");51 _Static_assert(__builtin_types_compatible_p(__typeof(pvat), int *volatile), "");52 _Static_assert(__builtin_types_compatible_p(int *volatile, __typeof(pvat)), "");53 _Static_assert(__builtin_types_compatible_p(__typeof(rat), int *restrict), "");54 _Static_assert(__builtin_types_compatible_p(int *restrict, __typeof(rat)), "");55 _Static_assert(__builtin_types_compatible_p(__typeof(aat1), _Atomic int), "");56 _Static_assert(__builtin_types_compatible_p(_Atomic int, __typeof(aat1)), "");57 _Static_assert(__builtin_types_compatible_p(__typeof(paat), _Atomic(int *)), "");58 _Static_assert(__builtin_types_compatible_p(_Atomic(int *), __typeof(paat)), "");59 60 // Ensure the types also work in generic selection expressions. Remember, the61 // type of the expression argument to _Generic is treated as-if it undergoes62 // lvalue to rvalue conversion, which drops qualifiers. We're making sure the63 // use of __auto_type doesn't impact that.64 (void)_Generic(cat, int : 0);65 (void)_Generic(pcat, int * : 0);66 (void)_Generic(vat, int : 0);67 (void)_Generic(pvat, int * : 0);68 (void)_Generic(rat, int * : 0);69 (void)_Generic(aat1, int : 0);70 (void)_Generic(paat, int * : 0);71 72 // Ensure that trying to merge two different __auto_type types does not73 // decide that they are both the same type when they're actually different,74 // and that we reject when the types are the same.75 __auto_type i = 12;76 __auto_type f = 1.2f;77 (void)_Generic(a, __typeof__(i) : 0, __typeof__(f) : 1);78 (void)_Generic(a,79 __typeof__(i) : 0, // expected-note {{compatible type 'typeof (i)' (aka 'int') specified here}}80 __typeof__(a) : 1); // expected-error {{type 'typeof (a)' (aka 'int') in generic association compatible with previously specified type 'typeof (i)' (aka 'int')}}81}82 83void Issue55702(void) {84 // A controlling expression which uses __auto_type should not be85 // automatically compatible with every association; we should be using the86 // canonical type for that comparison.87 void *ptr = 0;88 __auto_type v = ptr;89 (void)_Generic(v, long double : 0, double : 0, default : 1); // OK90 _Static_assert(_Generic(v, long double : 0, default : 1) == 1, "fail");91}92