1// RUN: %check_clang_tidy %s bugprone-misplaced-pointer-arithmetic-in-alloc %t
2
3class C {
4 int num;
5public:
6 explicit C(int n) : num(n) {}
7};
8
9void bad_new(int n, int m) {
10 C *p = new C(n) + 10;
11 // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: arithmetic operation is applied to the result of operator new() instead of its size-like argument
12 // CHECK-FIXES: C *p = new C(n + 10);
13
14 p = new C(n) - 10;
15 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new() instead of its size-like argument
16 // CHECK-FIXES: p = new C(n - 10);
17
18 p = new C(n) + m;
19 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new() instead of its size-like argument
20 // CHECK-FIXES: p = new C(n + m);
21
22 p = new C(n) - (m + 10);
23 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new() instead of its size-like argument
24 // CHECK-FIXES: p = new C(n - (m + 10));
25
26 p = new C(n) - m + 10;
27 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new() instead of its size-like argument
28 // CHECK-FIXES: p = new C(n - m) + 10;
29 // FIXME: Should be p = new C(n - m + 10);
30}
31
32void bad_new_array(int n, int m) {
33 char *p = new char[n] + 10;
34 // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: arithmetic operation is applied to the result of operator new[]() instead of its size-like argument
35 // CHECK-FIXES: char *p = new char[n + 10];
36
37 p = new char[n] - 10;
38 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new[]() instead of its size-like argument
39 // CHECK-FIXES: p = new char[n - 10];
40
41 p = new char[n] + m;
42 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new[]() instead of its size-like argument
43 // CHECK-FIXES: p = new char[n + m];
44
45 p = new char[n] - (m + 10);
46 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new[]() instead of its size-like argument
47 // CHECK-FIXES: p = new char[n - (m + 10)];
48
49 p = new char[n] - m + 10;
50 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: arithmetic operation is applied to the result of operator new[]() instead of its size-like argument
51 // CHECK-FIXES: p = new char[n - m] + 10;
52 // FIXME: should be p = new char[n - m + 10];
53}
54
55namespace std {
56typedef decltype(sizeof(void*)) size_t;
57}
58
59void* operator new(std::size_t, void*);
60
61void placement_new_ptr(void *buf, C *old) {
62 C **p = new (buf) C*(old) + 1;
63 // CHECK-MESSAGES-NOT: :[[@LINE-1]]:11: warning: arithmetic operation is applied to the result of operator new() instead of its size-like argument
64}
65

source code of clang-tools-extra/test/clang-tidy/checkers/bugprone/misplaced-pointer-arithmetic-in-alloc.cpp