70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
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// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsyntax-only -Wcast-align -verify %s
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// Simple casts.
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void test0(char *P) {
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char *a = (char*) P;
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short *b = (short*) P; // expected-warning {{cast from 'char *' to 'short *' increases required alignment from 1 to 2}}
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int *c = (int*) P; // expected-warning {{cast from 'char *' to 'int *' increases required alignment from 1 to 4}}
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}
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// Casts from void* are a special case.
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void test1(void *P) {
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char *a = (char*) P;
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short *b = (short*) P;
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int *c = (int*) P;
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const volatile void *P2 = P;
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char *d = (char*) P2;
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short *e = (short*) P2;
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int *f = (int*) P2;
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const char *g = (const char*) P2;
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const short *h = (const short*) P2;
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const int *i = (const int*) P2;
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const volatile char *j = (const volatile char*) P2;
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const volatile short *k = (const volatile short*) P2;
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const volatile int *l = (const volatile int*) P2;
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}
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// Aligned struct.
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struct __attribute__((aligned(16))) A {
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char buffer[16];
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};
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void test2(char *P) {
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struct A *a = (struct A*) P; // expected-warning {{cast from 'char *' to 'struct A *' increases required alignment from 1 to 16}}
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}
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// Incomplete type.
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void test3(char *P) {
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struct B *b = (struct B*) P;
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}
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// Do not issue a warning. The aligned attribute changes the alignment of the
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// variables and fields.
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char __attribute__((aligned(4))) a[16];
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struct S0 {
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char a[16];
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};
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struct S {
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char __attribute__((aligned(4))) a[16];
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struct S0 __attribute__((aligned(4))) s0;
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};
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void test4() {
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struct S s;
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int *i = (int *)s.a;
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i = (int *)&s.s0;
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i = (int *)a;
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}
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// No warnings.
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typedef int (*FnTy)(void);
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unsigned int func5(void);
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FnTy test5(void) {
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return (FnTy)&func5;
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}
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