p5.cpp source code [clang_source_code/test/CXX/dcl.dcl/dcl.attr/dcl.align/p5.cpp]

1	// RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -verify %s
2
3	alignas(1) int n1; // expected-error {{requested alignment is less than minimum alignment of 4 for type 'int'}}
4	alignas(1) alignas(2) int n2; // expected-error {{less than minimum alignment}}
5	alignas(1) alignas(2) alignas(4) int n3; // ok
6	alignas(1) alignas(2) alignas(0) int n4; // expected-error {{less than minimum alignment}}
7	alignas(1) alignas(2) int n5 alignas(4); // ok
8	alignas(1) alignas(4) int n6 alignas(2); // ok
9	alignas(1) int n7 alignas(2), // expected-error {{less than minimum alignment}}
10	n8 alignas(4); // ok
11	alignas(8) int n9 alignas(2); // ok, overaligned
12	alignas(1) extern int n10; // expected-error {{less than minimum alignment}}
13
14	enum alignas(1) E1 {}; // expected-error {{requested alignment is less than minimum alignment of 4 for type 'E1'}}
15	enum alignas(1) E2 : char {}; // ok
16	enum alignas(4) E3 { e3 = 0 }; // ok
17	enum alignas(4) E4 { e4 = 1ull << 33 }; // expected-error {{requested alignment is less than minimum alignment of 8 for type 'E4'}}
18	enum alignas(8) E5 {};
19	static_assert(alignof(E5) == 8, "");
20
21	typedef __attribute__((aligned(16))) int IntAlign16;
22	enum E6 : IntAlign16 {};
23	static_assert(alignof(E6) == 4, "");
24
25	struct S1 {
26	alignas(8) int n;
27	};
28	struct alignas(2) S2 { // expected-error {{requested alignment is less than minimum alignment of 4 for type 'S2'}}
29	int n;
30	};
31	struct alignas(2) S3 { // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S3'}}
32	S1 s1;
33	};
34	struct alignas(2) S4 : S1 { // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S4'}}
35	};
36	struct S5 : S1 {
37	alignas(2) S1 s1; // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S1'}}
38	};
39	struct S6 {
40	S1 s1;
41	};
42	struct S7 : S1 {
43	};
44	struct alignas(2) alignas(8) alignas(1) S8 : S1 {
45	};
46
47	S1 s1 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S1'}}
48	S6 s6 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S6'}}
49	S7 s7 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S7'}}
50
51	template<int N, int M, typename T>
52	struct alignas(N) X { // expected-error 3{{requested alignment is less than minimum}}
53	alignas(M) T t; // expected-error 3{{requested alignment is less than minimum}}
54	};
55
56	template struct X<1, 1, char>;
57	template struct X<4, 1, char>;
58	template struct X<1, 2, char>; // expected-note {{instantiation}}
59	template struct X<1, 1, short>; // expected-note {{instantiation}}
60	template struct X<2, 1, short>; // expected-note {{instantiation}}
61	template struct X<2, 2, short>;
62	template struct X<16, 8, S1>;
63	template struct X<4, 4, S1>; // expected-note {{instantiation}}
64
65	template<int N, typename T>
66	struct Y {
67	enum alignas(N) E : T {}; // expected-error {{requested alignment is less than minimum}}
68	};
69	template struct Y<1, char>;
70	template struct Y<2, char>;
71	template struct Y<1, short>; // expected-note {{instantiation}}
72	template struct Y<2, short>;
73
74	template<int N, typename T>
75	void f() {
76	alignas(N) T v; // expected-error {{requested alignment is less than minimum}}
77	};
78	template void f<1, char>();
79	template void f<2, char>();
80	template void f<1, short>(); // expected-note {{instantiation}}
81	template void f<2, short>();
82

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