1// RUN: %check_clang_tidy %s bugprone-sizeof-expression %t -- -config="{CheckOptions: {bugprone-sizeof-expression.WarnOnSizeOfPointerToAggregate: false}}" --
2
3class C {
4 int size() { return sizeof(this); }
5 // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: suspicious usage of 'sizeof(this)'
6};
7
8#pragma pack(1)
9struct S { char a, b, c; };
10
11int Test5() {
12 typedef int Array10[10];
13 typedef C ArrayC[10];
14
15 struct MyStruct {
16 Array10 arr;
17 Array10* ptr;
18 };
19 typedef const MyStruct TMyStruct;
20 typedef const MyStruct *PMyStruct;
21 typedef TMyStruct *PMyStruct2;
22
23 static TMyStruct kGlocalMyStruct = {};
24 static TMyStruct volatile * kGlocalMyStructPtr = &kGlocalMyStruct;
25
26 MyStruct S;
27 PMyStruct PS;
28 PMyStruct2 PS2;
29 Array10 A10;
30 C *PtrArray[10];
31 C *PC;
32
33 int sum = 0;
34 sum += sizeof(&S.arr);
35 // No warning.
36 sum += sizeof(&kGlocalMyStruct.arr);
37 // No warning.
38 sum += sizeof(&kGlocalMyStructPtr->arr);
39 // No warning.
40 sum += sizeof(S.arr + 0);
41 // No warning.
42 sum += sizeof(+ S.arr);
43 // No warning.
44 sum += sizeof((int*)S.arr);
45 // No warning.
46
47 sum += sizeof(S.ptr);
48 // No warning.
49 sum += sizeof(kGlocalMyStruct.ptr);
50 // No warning.
51 sum += sizeof(kGlocalMyStructPtr->ptr);
52 // No warning.
53
54 sum += sizeof(&kGlocalMyStruct);
55 // No warning.
56 sum += sizeof(&S);
57 // No warning.
58 sum += sizeof(MyStruct*);
59 sum += sizeof(PMyStruct);
60 sum += sizeof(PS);
61 // No warning.
62 sum += sizeof(PS2);
63 // No warning.
64 sum += sizeof(&A10);
65 // No warning.
66 sum += sizeof(PtrArray) / sizeof(PtrArray[1]);
67 // No warning.
68 sum += sizeof(A10) / sizeof(PtrArray[0]);
69 // No warning.
70 sum += sizeof(PC) / sizeof(PtrArray[0]);
71 // CHECK-MESSAGES: :[[@LINE-1]]:21: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; both expressions have the same type
72 sum += sizeof(ArrayC) / sizeof(PtrArray[0]);
73 // CHECK-MESSAGES: :[[@LINE-1]]:25: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; numerator is not a multiple of denominator
74
75 return sum;
76}
77

source code of clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-warn-on-sizeof-pointer-to-aggregate.cpp