File: bitwise-pointer-cast.cpp

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.8-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,388 kB
  • sloc: cpp: 7,438,767; ansic: 1,393,871; asm: 1,012,926; python: 241,728; f90: 86,635; objc: 75,411; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (41 lines) | stat: -rw-r--r-- 913 bytes parent folder | download | duplicates (11) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
// RUN: %check_clang_tidy %s bugprone-bitwise-pointer-cast %t

void memcpy(void* to, void* dst, unsigned long long size)
{
  // Dummy implementation for the purpose of the test
}

namespace std
{
using ::memcpy;
}

void pointer2pointer()
{
  int x{};
  int* px{};
  float y{};
  float* py{};

  memcpy(&py, &px, sizeof(px));
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not use 'memcpy' to cast between pointers [bugprone-bitwise-pointer-cast]
  std::memcpy(&py, &px, sizeof(px));
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not use 'memcpy' to cast between pointers [bugprone-bitwise-pointer-cast]

  std::memcpy(&y, &x, sizeof(x));
}

// Pointer-integer conversions are allowed by this check
void int2pointer()
{
  unsigned long long addr{};
  float* p{};
  std::memcpy(&p, &addr, sizeof(addr));
}

void pointer2int()
{
  unsigned long long addr{};
  float* p{};
  std::memcpy(&addr, &p, sizeof(p));
}