warn-cast-align.c source code [clang_source_code/test/Sema/warn-cast-align.c]

1	// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsyntax-only -Wcast-align -verify %s
2
3	// Simple casts.
4	void test0(char *P) {
5	char a = (char) P;
6	short b = (short) P; // expected-warning {{cast from 'char ' to 'short ' increases required alignment from 1 to 2}}
7	int c = (int) P; // expected-warning {{cast from 'char ' to 'int ' increases required alignment from 1 to 4}}
8	}
9
10	// Casts from void* are a special case.
11	void test1(void *P) {
12	char a = (char) P;
13	short b = (short) P;
14	int c = (int) P;
15
16	const volatile void *P2 = P;
17	char d = (char) P2;
18	short e = (short) P2;
19	int f = (int) P2;
20
21	const char g = (const char) P2;
22	const short h = (const short) P2;
23	const int i = (const int) P2;
24
25	const volatile char j = (const volatile char) P2;
26	const volatile short k = (const volatile short) P2;
27	const volatile int l = (const volatile int) P2;
28	}
29
30	// Aligned struct.
31	struct __attribute__((aligned(16))) A {
32	char buffer[16];
33	};
34	void test2(char *P) {
35	struct A a = (struct A) P; // expected-warning {{cast from 'char ' to 'struct A ' increases required alignment from 1 to 16}}
36	}
37
38	// Incomplete type.
39	void test3(char *P) {
40	struct B b = (struct B) P;
41	}
42
43	// Do not issue a warning. The aligned attribute changes the alignment of the
44	// variables and fields.
45	char __attribute__((aligned(4))) a[16];
46
47	struct S0 {
48	char a[16];
49	};
50
51	struct S {
52	char __attribute__((aligned(4))) a[16];
53	struct S0 __attribute__((aligned(4))) s0;
54	};
55
56	void test4() {
57	struct S s;
58	int i = (int )s.a;
59	i = (int *)&s.s0;
60	i = (int *)a;
61	}
62
63	// No warnings.
64	typedef int (*FnTy)(void);
65	unsigned int func5(void);
66
67	FnTy test5(void) {
68	return (FnTy)&func5;
69	}
70

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