clang/test/SemaCXX/align-x86.cpp

   1 // RUN: %clang_cc1 -std=c++11 -triple i386-apple-darwin9 -fsyntax-only -verify %s
   2
   3 using size_t = decltype(sizeof(0));
   4
   5 struct complex_double {
   6   double real;
   7   double imag;
   8 };
   9
  10 template <typename T, size_t ABI, size_t Preferred>
  11 struct check_alignment {
  12   using type = T;
  13   static type value;
  14
  15   static_assert(__alignof__(value) == Preferred, "__alignof__(value) != Preferred");
  16   static_assert(__alignof__(type) == Preferred, "__alignof__(type) != Preferred");
  17   static_assert(alignof(type) == ABI, "alignof(type) != ABI");
  18 };
  19
  20 // PR3433
  21 template struct check_alignment<double, 4, 8>;
  22 template struct check_alignment<long long, 4, 8>;
  23 template struct check_alignment<unsigned long long, 4, 8>;
  24 template struct check_alignment<complex_double, 4, 4>;
  25
  26 // PR6362
  27 struct __attribute__((packed))
  28 packed_struct {
  29   unsigned int a;
  30 } g_packedstruct;
  31 template struct check_alignment<packed_struct, 1, 1>;
  32 static_assert(__alignof__(g_packedstruct.a) == 1, "__alignof__(packed_struct.member) != 1");
  33
  34 template struct check_alignment<double[3], 4, 8>;
  35
  36 enum big_enum { x = 18446744073709551615ULL };
  37 template struct check_alignment<big_enum, 4, 8>;
  38
  39 // PR5637
  40
  41 #define ALIGNED(x) __attribute__((aligned(x)))
  42
  43 typedef ALIGNED(2) struct {
  44   char a[3];
  45 } aligned_before_struct;
  46
  47 static_assert(sizeof(aligned_before_struct)       == 3, "");
  48 static_assert(sizeof(aligned_before_struct[1])    == 4, ""); // expected-error {{size of array element}}
  49 static_assert(sizeof(aligned_before_struct[2])    == 6, ""); // expected-error {{size of array element}}
  50 static_assert(sizeof(aligned_before_struct[2][1]) == 8, ""); // expected-error {{size of array element}}
  51 static_assert(sizeof(aligned_before_struct[1][2]) == 6, ""); // expected-error {{size of array element}}
  52
  53 typedef struct ALIGNED(2) {
  54   char a[3];
  55 } aligned_after_struct;
  56
  57 static_assert(sizeof(aligned_after_struct)       == 4, "");
  58 static_assert(sizeof(aligned_after_struct[1])    == 4, "");
  59 static_assert(sizeof(aligned_after_struct[2])    == 8, "");
  60 static_assert(sizeof(aligned_after_struct[2][1]) == 8, "");
  61 static_assert(sizeof(aligned_after_struct[1][2]) == 8, "");