1 // RUN: %check_clang_tidy %s bugprone-misplaced-pointer-arithmetic-in-alloc %t
2 
3 class C {
4   int num;
5 public:
6   explicit C(int n) : num(n) {}
7 };
8 
9 void 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 
32 void 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 
55 namespace std {
56 typedef decltype(sizeof(void*)) size_t;
57 }
58 
59 void* operator new(std::size_t, void*);
60 
61 void 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