clang/test/Sema/tls_alignment.cpp

   1 // TLS variable cannot be aligned to more than 32 bytes on PS4.
   2
   3 // RUN: %clang_cc1 -triple x86_64-scei-ps4 -fsyntax-only -verify %s
   4
   5
   6 // A non-aligned type.
   7 struct non_aligned_struct {
   8     int some_data[16]; // 64 bytes of stuff, non aligned.
   9 };
  10
  11 // An aligned type.
  12 struct __attribute__(( aligned(64) )) aligned_struct {
  13     int some_data[12]; // 48 bytes of stuff, aligned to 64.
  14 };
  15
  16 // A type with an aligned field.
  17 struct  struct_with_aligned_field {
  18     int some_aligned_data[12] __attribute__(( aligned(64) )); // 48 bytes of stuff, aligned to 64.
  19 };
  20
  21 // A typedef of the aligned struct.
  22 typedef aligned_struct another_aligned_struct;
  23
  24 // A typedef to redefine a non-aligned struct as aligned.
  25 typedef __attribute__(( aligned(64) )) non_aligned_struct yet_another_aligned_struct;
  26
  27 // Non aligned variable doesn't cause an error.
  28 __thread non_aligned_struct foo;
  29
  30 // Variable aligned because of its type should cause an error.
  31 __thread aligned_struct                    bar; // expected-error{{alignment (64) of thread-local variable}}
  32
  33 // Variable explicitly aligned in the declaration should cause an error.
  34 __thread non_aligned_struct                bar2 __attribute__(( aligned(64) )); // expected-error{{alignment (64) of thread-local variable}}
  35
  36 // Variable aligned because of one of its fields should cause an error.
  37 __thread struct_with_aligned_field         bar3; // expected-error{{alignment (64) of thread-local variable}}
  38
  39 // Variable aligned because of typedef, first case.
  40 __thread another_aligned_struct            bar4; // expected-error{{alignment (64) of thread-local variable}}
  41
  42 // Variable aligned because of typedef, second case.
  43 __thread yet_another_aligned_struct        bar5; // expected-error{{alignment (64) of thread-local variable}}
  44
  45 int baz ()
  46 {
  47     return foo.some_data[0] + bar.some_data[1] + bar2.some_data[2] +
  48            bar3.some_aligned_data[3] + bar4.some_data[4] +
  49            bar5.some_data[5];
  50 }
  51
  52
  53 // Verify alignment check where a dependent type is involved.
  54 // The check is (correctly) not performed on "t", but the check still is
  55 // performed on the structure as a whole once it has been instantiated.
  56
  57 template<class T> struct templated_tls {
  58     static __thread T t;
  59     T other_t __attribute__(( aligned(64) ));
  60 };
  61 __thread templated_tls<int> blah; // expected-error{{alignment (64) of thread-local variable}}
  62
  63 int blag() {
  64     return blah.other_t * 2;
  65 }
  66
  67
  68 // Verify alignment check where the alignment is a template parameter.
  69 // The check is only performed during instantiation.
  70 template <int N>
  71 struct S {
  72   static int __thread __attribute__((aligned(N))) x; // expected-error{{alignment (64) of thread-local variable}}
  73 };
  74
  75 S<64> s_instance; // expected-note{{in instantiation of template class 'S<64>' requested here}}