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

   1 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=precxx17 %std_cxx98-14 %s
   2 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=cxx17 %std_cxx17- %s
   3
   4 namespace test1 {
   5 struct 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
  14 void 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
  21 namespace test2 {
  22 struct S {
  23   char c[256];
  24 };
  25
  26 class Test {
  27   typedef S __attribute__((aligned(256))) alignedS;
  28   alignedS high_contention_data[10];
  29 };
  30
  31 void 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
  38 namespace test3 {
  39 struct 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
  53 void 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
  60 namespace test4 {
  61 struct 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
  75 void 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 }