File: null-deref-static.m

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,998,520 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (35 lines) | stat: -rw-r--r-- 925 bytes parent folder | download | duplicates (12) 
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
 
// RUN: %clang_cc1 -w -fblocks -analyze -analyzer-checker=core,deadcode,alpha.core,debug.ExprInspection -verify %s

void *malloc(unsigned long);
void clang_analyzer_warnIfReached(void);

void test_static_from_block(void) {
  static int *x;
  ^{
    *x; // no-warning
  };
}

void test_static_within_block(void) {
  ^{
    static int *x;
    *x; // expected-warning{{Dereference of null pointer}}
  };
}

void test_static_control_flow(int y) {
  static int *x;
  if (x) {
    // FIXME: Should be reachable.
    clang_analyzer_warnIfReached(); // no-warning
  }
  if (y) {
    // We are not sure if this branch is possible, because the developer
    // may argue that function is always called with y == 1 for the first time.
    // In this case, we can only advise the developer to add assertions
    // for suppressing such path.
    *x; // expected-warning{{Dereference of null pointer}}
  } else {
    x = malloc(1);
  }
}