clang/test/Sema/struct-packed-align.c

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify
   2 // RUN: %clang_cc1 %s -fsyntax-only -triple=x86_64-windows-coff -verify
   3 // RUN: %clang_cc1 %s -fsyntax-only -triple=x86_64-scei-ps4 -verify
   4 // RUN: %clang_cc1 %s -fsyntax-only -triple=x86_64-sie-ps5 -verify
   5
   6 // Packed structs.
   7 struct s {
   8     char a;
   9     int b  __attribute__((packed));
  10     char c;
  11     int d;
  12 };
  13
  14 extern int a1[sizeof(struct s) == 12 ? 1 : -1];
  15 extern int a2[__alignof(struct s) == 4 ? 1 : -1];
  16
  17 struct __attribute__((packed)) packed_s {
  18     char a;
  19     int b  __attribute__((packed));
  20     char c;
  21     int d;
  22 };
  23
  24 extern int b1[sizeof(struct packed_s) == 10 ? 1 : -1];
  25 extern int b2[__alignof(struct packed_s) == 1 ? 1 : -1];
  26
  27 struct fas {
  28     char a;
  29     int b[];
  30 };
  31
  32 extern int c1[sizeof(struct fas) == 4 ? 1 : -1];
  33 extern int c2[__alignof(struct fas) == 4 ? 1 : -1];
  34
  35 struct __attribute__((packed)) packed_fas {
  36     char a;
  37     int b[];
  38 };
  39
  40 extern int d1[sizeof(struct packed_fas) == 1 ? 1 : -1];
  41 extern int d2[__alignof(struct packed_fas) == 1 ? 1 : -1];
  42
  43 struct packed_after_fas {
  44     char a;
  45     int b[];
  46 } __attribute__((packed));
  47
  48 extern int d1_2[sizeof(struct packed_after_fas) == 1 ? 1 : -1];
  49 extern int d2_2[__alignof(struct packed_after_fas) == 1 ? 1 : -1];
  50
  51 // Alignment
  52
  53 struct __attribute__((aligned(8))) as1 {
  54     char c;
  55 };
  56
  57 extern int e1[sizeof(struct as1) == 8 ? 1 : -1];
  58 extern int e2[__alignof(struct as1) == 8 ? 1 : -1];
  59
  60 struct __attribute__((aligned)) as1_2 {
  61     char c;
  62 };
  63 #if ( defined(__s390x__) || ( defined (__ARM_32BIT_STATE) && ! defined(__ANDROID__) ) )
  64 extern int e1_2[sizeof(struct as1_2) == 8 ? 1 : -1];
  65 extern int e2_2[__alignof(struct as1_2) == 8 ? 1 : -1];
  66 #else
  67 extern int e1_2[sizeof(struct as1_2) == 16 ? 1 : -1];
  68 extern int e2_2[__alignof(struct as1_2) == 16 ? 1 : -1];
  69 #endif
  70
  71 struct as2 {
  72     char c;
  73     int __attribute__((aligned(8))) a;
  74 };
  75
  76 extern int f1[sizeof(struct as2) == 16 ? 1 : -1];
  77 extern int f2[__alignof(struct as2) == 8 ? 1 : -1];
  78
  79 struct __attribute__((packed)) as3 {
  80     char c;
  81     int a;
  82     int __attribute__((aligned(8))) b;
  83 };
  84
  85 extern int g1[sizeof(struct as3) == 16 ? 1 : -1];
  86 extern int g2[__alignof(struct as3) == 8 ? 1 : -1];
  87
  88
  89 struct packedtest {
  90   int ted_likes_cheese;
  91   void *args[] __attribute__((packed));
  92 };
  93
  94 // Packed union
  95 union __attribute__((packed)) au4 {char c; int x;};
  96 extern int h1[sizeof(union au4) == 4 ? 1 : -1];
  97 extern int h2[__alignof(union au4) == 1 ? 1 : -1];
  98
  99 // Aligned union
 100 union au5 {__attribute__((aligned(4))) char c;};
 101 extern int h1[sizeof(union au5) == 4 ? 1 : -1];
 102 extern int h2[__alignof(union au5) == 4 ? 1 : -1];
 103
 104 // Alignment+packed
 105 struct as6 {char c; __attribute__((packed, aligned(2))) int x;};
 106 extern int i1[sizeof(struct as6) == 6 ? 1 : -1];
 107 extern int i2[__alignof(struct as6) == 2 ? 1 : -1];
 108
 109 union au6 {char c; __attribute__((packed, aligned(2))) int x;};
 110 extern int k1[sizeof(union au6) == 4 ? 1 : -1];
 111 extern int k2[__alignof(union au6) == 2 ? 1 : -1];
 112
 113 // Check postfix attributes
 114 union au7 {char c; int x;} __attribute__((packed));
 115 extern int l1[sizeof(union au7) == 4 ? 1 : -1];
 116 extern int l2[__alignof(union au7) == 1 ? 1 : -1];
 117
 118 struct packed_fas2 {
 119     char a;
 120     int b[];
 121 } __attribute__((packed));
 122
 123 extern int m1[sizeof(struct packed_fas2) == 1 ? 1 : -1];
 124 extern int m2[__alignof(struct packed_fas2) == 1 ? 1 : -1];
 125
 126 // Attribute aligned can round down typedefs.  PR9253
 127 typedef long long  __attribute__((aligned(1))) nt;
 128
 129 struct nS {
 130   char buf_nr;
 131   nt start_lba;
 132 };
 133
 134 #if defined(_WIN32) && !defined(__declspec) // _MSC_VER is unavailable in cc1.
 135 // Alignment doesn't affect packing in MS mode.
 136 extern int n1[sizeof(struct nS) == 16 ? 1 : -1];
 137 extern int n2[__alignof(struct nS) == 8 ? 1 : -1];
 138 #else
 139 extern int n1[sizeof(struct nS) == 9 ? 1 : -1];
 140 extern int n2[__alignof(struct nS) == 1 ? 1 : -1];
 141 #endif
 142
 143 // Packed attribute shouldn't be ignored for bit-field of char types.
 144 // Note from GCC reference manual: The 4.1, 4.2 and 4.3 series of GCC ignore
 145 // the packed attribute on bit-fields of type char. This has been fixed in
 146 // GCC 4.4 but the change can lead to differences in the structure layout.
 147 // See the documentation of -Wpacked-bitfield-compat for more information.
 148 struct packed_chars {
 149   char a : 8, b : 8, c : 8, d : 4;
 150 #ifdef __SCE__
 151   // Test for pre-r254596 clang behavior on the PS4/PS5 targets, which must
 152   // maintain ABI backwards compatibility.
 153   char e : 8 __attribute__((packed));
 154   // expected-warning@-1 {{'packed' attribute ignored for field of type 'char'}}
 155 #else
 156   char e : 8 __attribute__((packed));
 157   // expected-warning@-1 {{'packed' attribute was ignored on bit-fields with single-byte alignment in older versions of GCC and Clang}}
 158 #endif
 159   char f : 4, g : 8, h : 8, i : 8;
 160 };
 161
 162 #if (defined(_WIN32) || defined(__SCE__)) && !defined(__declspec) // _MSC_VER is unavailable in cc1.
 163 // On Windows clang uses MSVC compatible layout in this case.
 164 //
 165 // Additionally, test for pre-r254596 clang behavior on the PS4/PS5 targets.
 166 // They must maintain ABI backwards compatibility.
 167 extern int o1[sizeof(struct packed_chars) == 9 ? 1 : -1];
 168 extern int o2[__alignof(struct packed_chars) == 1 ? 1 : -1];
 169 #elif defined(_AIX)
 170 // On AIX, char bitfields have the same alignment as unsigned int.
 171 extern int o1[sizeof(struct packed_chars) == 8 ? 1 : -1];
 172 extern int o2[__alignof(struct packed_chars) == 4 ? 1 : -1];
 173 #else
 174 extern int o1[sizeof(struct packed_chars) == 8 ? 1 : -1];
 175 extern int o2[__alignof(struct packed_chars) == 1 ? 1 : -1];
 176 #endif