1 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify %s 2 3 namespace test1 { 4 struct Test { 5 template <typename T> 6 struct SeparateCacheLines { 7 T data; 8 } __attribute__((aligned(256))); 9 10 SeparateCacheLines<int> high_contention_data[10]; 11 }; 12 13 void helper() { 14 Test t; 15 new Test; // expected-warning {{type 'test1::Test' requires 256 bytes of alignment and the default allocator only guarantees}} 16 new Test[10]; // expected-warning {{type 'test1::Test' requires 256 bytes of alignment and the default allocator only guarantees}} 17 } 18 } 19 20 namespace test2 { 21 class Test { 22 typedef int __attribute__((aligned(256))) aligned_int; 23 aligned_int high_contention_data[10]; 24 }; 25 26 void helper() { 27 Test t; 28 new Test; // expected-warning {{type 'test2::Test' requires 256 bytes of alignment and the default allocator only guarantees}} 29 new Test[10]; // expected-warning {{type 'test2::Test' requires 256 bytes of alignment and the default allocator only guarantees}} 30 } 31 } 32 33 namespace test3 { 34 struct Test { 35 template <typename T> 36 struct SeparateCacheLines { 37 T data; 38 } __attribute__((aligned(256))); 39 40 void* operator new(unsigned long) { 41 return 0; // expected-warning {{'operator new' should not return a null pointer unless it is declared 'throw()'}} 42 } 43 44 SeparateCacheLines<int> high_contention_data[10]; 45 }; 46 47 void helper() { 48 Test t; 49 new Test; 50 new Test[10]; // expected-warning {{type 'test3::Test' requires 256 bytes of alignment and the default allocator only guarantees}} 51 } 52 } 53 54 namespace test4 { 55 struct Test { 56 template <typename T> 57 struct SeparateCacheLines { 58 T data; 59 } __attribute__((aligned(256))); 60 61 void* operator new[](unsigned long) { 62 return 0; // expected-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()'}} 63 } 64 65 SeparateCacheLines<int> high_contention_data[10]; 66 }; 67 68 void helper() { 69 Test t; 70 new Test; // expected-warning {{type 'test4::Test' requires 256 bytes of alignment and the default allocator only guarantees}} 71 new Test[10]; 72 } 73 } 74
