81 lines · cpp
1// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=precxx17 %std_cxx98-14 %s2// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=cxx17 %std_cxx17- %s3 4namespace test1 {5struct Test {6 template <typename T>7 struct SeparateCacheLines {8 T data;9 } __attribute__((aligned(256)));10 11 SeparateCacheLines<int> high_contention_data[10];12};13 14void helper() {15 Test t;16 new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}17 new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}18}19}20 21namespace test2 {22struct S {23 char c[256];24};25 26class Test {27 typedef S __attribute__((aligned(256))) alignedS;28 alignedS high_contention_data[10];29};30 31void helper() {32 Test t;33 new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}34 new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}35}36}37 38namespace test3 {39struct Test {40 template <typename T>41 struct SeparateCacheLines {42 T data;43 } __attribute__((aligned(256)));44 45 void* operator new(unsigned long) {46 return 0; // precxx17-warning {{'operator new' should not return a null pointer unless it is declared 'throw()'}} \47 cxx17-warning {{'operator new' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}}48 }49 50 SeparateCacheLines<int> high_contention_data[10];51};52 53void helper() {54 Test t;55 new Test;56 new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}57}58}59 60namespace test4 {61struct Test {62 template <typename T>63 struct SeparateCacheLines {64 T data;65 } __attribute__((aligned(256)));66 67 void* operator new[](unsigned long) {68 return 0; // precxx17-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()'}} \69 cxx17-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}}70 }71 72 SeparateCacheLines<int> high_contention_data[10];73};74 75void helper() {76 Test t;77 new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}78 new Test[10];79}80}81