clang/test/SemaCXX/warn-new-overaligned-3.cpp

   1 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned %s -isystem %S/Inputs -verify=precxx17 %std_cxx11-14
   2 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned %s -isystem %S/Inputs -verify %std_cxx17-
   3
   4 // expected-no-diagnostics
   5
   6 // This test ensures that we still get the warning even if we #include <new>
   7 // where the header here simulates <new>.
   8 #include <warn-new-overaligned-3.h>
   9
  10 namespace test1 {
  11 struct Test {
  12   template <typename T>
  13   struct SeparateCacheLines {
  14     T data;
  15   } __attribute__((aligned(256)));
  16
  17   SeparateCacheLines<int> high_contention_data[10];
  18 };
  19
  20 void helper() {
  21   Test t;
  22   new Test;  // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
  23   new Test[10];  // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
  24 }
  25 }
  26
  27 namespace test2 {
  28 struct helper { int i __attribute__((aligned(256))); };
  29
  30 struct Placement {
  31   Placement() {
  32     new (d) helper();
  33   }
  34   helper *d;
  35 };
  36 }