File: pointer-arithmetic.c

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (30 lines) | stat: -rw-r--r-- 711 bytes parent folder | download | duplicates (13) 
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
 
// RUN: %clang_analyze_cc1 -analyzer-checker=core -verify %s

int test1(void) {
  int *p = (int *)sizeof(int);
  p -= 1;
  return *p; // expected-warning {{Dereference of null pointer}}
}

int test2(void) {
  int *p = (int *)sizeof(int);
  p -= 2;
  p += 1;
  return *p; // expected-warning {{Dereference of null pointer}}
}

int test3(void) {
  int *p = (int *)sizeof(int);
  p++;
  p--;
  p--;
  return *p; // expected-warning {{Dereference of null pointer}}
}

int test4(void) {
  // This is a special case where pointer arithmetic is not calculated to
  // preserve useful warnings on dereferences of null pointers.
  int *p = 0;
  p += 1;
  return *p; // expected-warning {{Dereference of null pointer}}
}