clang/test/CodeGenCXX/microsoft-abi-array-cookies.cpp

   1 // RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 | FileCheck %s
   2
   3 struct ClassWithoutDtor {
   4   char x;
   5 };
   6
   7 void check_array_no_cookies() {
   8 // CHECK: define dso_local void @"?check_array_no_cookies@@YAXXZ"() [[NUW:#[0-9]+]]
   9
  10 // CHECK: call noalias noundef nonnull i8* @"??_U@YAPAXI@Z"(i32 noundef 42)
  11   ClassWithoutDtor *array = new ClassWithoutDtor[42];
  12
  13 // CHECK: call void @"??_V@YAXPAX@Z"(
  14   delete [] array;
  15
  16 }
  17
  18 struct ClassWithDtor {
  19   char x;
  20   ~ClassWithDtor() {}
  21 };
  22
  23 void check_array_cookies_simple() {
  24 // CHECK: define {{.*}} @"?check_array_cookies_simple@@YAXXZ"()
  25
  26   ClassWithDtor *array = new ClassWithDtor[42];
  27 // CHECK: [[ALLOCATED:%.*]] = call noalias noundef nonnull i8* @"??_U@YAPAXI@Z"(i32 noundef 46)
  28 // 46 = 42 + size of cookie (4)
  29 // CHECK: [[COOKIE:%.*]] = bitcast i8* [[ALLOCATED]] to i32*
  30 // CHECK: store i32 42, i32* [[COOKIE]]
  31 // CHECK: [[ARRAY:%.*]] = getelementptr inbounds i8, i8* [[ALLOCATED]], i32 4
  32 // CHECK: bitcast i8* [[ARRAY]] to [[CLASS:%.*]]*
  33
  34   delete [] array;
  35 // CHECK: [[ARRAY_AS_CHAR:%.*]] = bitcast [[CLASS]]* {{%.*}} to i8*
  36 // CHECK: getelementptr inbounds i8, i8* [[ARRAY_AS_CHAR]], i32 -4
  37 }
  38
  39 struct __attribute__((aligned(8))) ClassWithAlignment {
  40   // FIXME: replace __attribute__((aligned(8))) with __declspec(align(8)) once
  41   // http://llvm.org/bugs/show_bug.cgi?id=12631 is fixed.
  42   int *x, *y;
  43   ~ClassWithAlignment() {}
  44 };
  45
  46 void check_array_cookies_aligned() {
  47 // CHECK: define {{.*}} @"?check_array_cookies_aligned@@YAXXZ"()
  48   ClassWithAlignment *array = new ClassWithAlignment[42];
  49 // CHECK: [[ALLOCATED:%.*]] = call noalias noundef nonnull i8* @"??_U@YAPAXI@Z"(i32 noundef 344)
  50 //   344 = 42*8 + size of cookie (8, due to alignment)
  51 // CHECK: [[COOKIE:%.*]] = bitcast i8* [[ALLOCATED]] to i32*
  52 // CHECK: store i32 42, i32* [[COOKIE]]
  53 // CHECK: [[ARRAY:%.*]] = getelementptr inbounds i8, i8* [[ALLOCATED]], i32 8
  54 // CHECK: bitcast i8* [[ARRAY]] to [[CLASS:%.*]]*
  55
  56   delete [] array;
  57 // CHECK: [[ARRAY_AS_CHAR:%.*]] = bitcast [[CLASS]]*
  58 // CHECK: getelementptr inbounds i8, i8* [[ARRAY_AS_CHAR]], i32 -8
  59 }
  60
  61 namespace PR23990 {
  62 struct S {
  63   char x[42];
  64   void operator delete[](void *p, __SIZE_TYPE__);
  65   // CHECK-LABEL: define dso_local void @"?delete_s@PR23990@@YAXPAUS@1@@Z"(
  66   // CHECK: call void @"??_VS@PR23990@@SAXPAXI@Z"(i8* noundef {{.*}}, i32 noundef 42)
  67 };
  68 void delete_s(S *s) { delete[] s; }
  69 }
  70
  71 // CHECK: attributes [[NUW]] = { mustprogress noinline nounwind{{.*}} }