mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-17 03:26:48 +00:00
adaf62ced2
alignments In the following code, the first element is aligned on a 16-byte boundary, but the remaining elements aren't: ``` typedef char int8_a16 __attribute__((aligned(16))); int8_a16 array[4]; ``` Currently clang doesn't reject the code, but it should since it can cause crashes at runtime. This patch also fixes assertion failures in CodeGen caused by the changes in https://reviews.llvm.org/D123649. Differential Revision: https://reviews.llvm.org/D133711
62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
// RUN: %clang_cc1 -std=c++11 -triple i386-apple-darwin9 -fsyntax-only -verify %s
|
|
|
|
using size_t = decltype(sizeof(0));
|
|
|
|
struct complex_double {
|
|
double real;
|
|
double imag;
|
|
};
|
|
|
|
template <typename T, size_t ABI, size_t Preferred>
|
|
struct check_alignment {
|
|
using type = T;
|
|
static type value;
|
|
|
|
static_assert(__alignof__(value) == Preferred, "__alignof__(value) != Preferred");
|
|
static_assert(__alignof__(type) == Preferred, "__alignof__(type) != Preferred");
|
|
static_assert(alignof(type) == ABI, "alignof(type) != ABI");
|
|
};
|
|
|
|
// PR3433
|
|
template struct check_alignment<double, 4, 8>;
|
|
template struct check_alignment<long long, 4, 8>;
|
|
template struct check_alignment<unsigned long long, 4, 8>;
|
|
template struct check_alignment<complex_double, 4, 4>;
|
|
|
|
// PR6362
|
|
struct __attribute__((packed))
|
|
packed_struct {
|
|
unsigned int a;
|
|
} g_packedstruct;
|
|
template struct check_alignment<packed_struct, 1, 1>;
|
|
static_assert(__alignof__(g_packedstruct.a) == 1, "__alignof__(packed_struct.member) != 1");
|
|
|
|
template struct check_alignment<double[3], 4, 8>;
|
|
|
|
enum big_enum { x = 18446744073709551615ULL };
|
|
template struct check_alignment<big_enum, 4, 8>;
|
|
|
|
// PR5637
|
|
|
|
#define ALIGNED(x) __attribute__((aligned(x)))
|
|
|
|
typedef ALIGNED(2) struct {
|
|
char a[3];
|
|
} aligned_before_struct;
|
|
|
|
static_assert(sizeof(aligned_before_struct) == 3, "");
|
|
static_assert(sizeof(aligned_before_struct[1]) == 4, ""); // expected-error {{size of array element}}
|
|
static_assert(sizeof(aligned_before_struct[2]) == 6, ""); // expected-error {{size of array element}}
|
|
static_assert(sizeof(aligned_before_struct[2][1]) == 8, ""); // expected-error {{size of array element}}
|
|
static_assert(sizeof(aligned_before_struct[1][2]) == 6, ""); // expected-error {{size of array element}}
|
|
|
|
typedef struct ALIGNED(2) {
|
|
char a[3];
|
|
} aligned_after_struct;
|
|
|
|
static_assert(sizeof(aligned_after_struct) == 4, "");
|
|
static_assert(sizeof(aligned_after_struct[1]) == 4, "");
|
|
static_assert(sizeof(aligned_after_struct[2]) == 8, "");
|
|
static_assert(sizeof(aligned_after_struct[2][1]) == 8, "");
|
|
static_assert(sizeof(aligned_after_struct[1][2]) == 8, "");
|