clang/test/Analysis/null-deref-path-notes.cpp

   1 // RUN: %clang_analyze_cc1 -w -x c++ -analyzer-checker=core -analyzer-output=text -verify %s
   2
   3 namespace pr34731 {
   4 int b;
   5 class c {
   6   class B {
   7    public:
   8     double ***d;
   9     B();
  10   };
  11   void e(double **, int);
  12   void f(B &, int &);
  13 };
  14
  15 // Properly track the null pointer in the array field back to the default
  16 // constructor of 'h'.
  17 void c::f(B &g, int &i) {
  18   e(g.d[9], i); // expected-warning{{Array access (via field 'd') results in a null pointer dereference}}
  19                 // expected-note@-1{{Array access (via field 'd') results in a null pointer dereference}}
  20   B h, a; // expected-note{{Value assigned to 'h.d'}}
  21   a.d == __null; // expected-note{{Assuming the condition is true}}
  22   a.d != h.d; // expected-note{{Assuming 'a.d' is equal to 'h.d'}}
  23   f(h, b); // expected-note{{Calling 'c::f'}}
  24 }
  25 }
  26
  27 namespace GH124975 {
  28 void no_crash_in_br_visitors(int *p) {
  29   if (p) {}
  30   // expected-note@-1 {{Assuming 'p' is null}}
  31   // expected-note@-2 {{Taking false branch}}
  32
  33   extern bool ExternLocalCoin;
  34   // expected-note@+2 {{Assuming 'ExternLocalCoin' is false}}
  35   // expected-note@+1 {{Taking false branch}}
  36   if (ExternLocalCoin)
  37     return;
  38
  39   *p = 4;
  40   // expected-warning@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  41   // expected-note@-2    {{Dereference of null pointer (loaded from variable 'p')}}
  42 }
  43
  44 // Thread local variables are implicitly static, so let's test them too.
  45 void thread_local_alternative(int *p) {
  46   if (p) {}
  47   // expected-note@-1 {{Assuming 'p' is null}}
  48   // expected-note@-2 {{Taking false branch}}
  49
  50   thread_local bool ThreadLocalCoin;
  51   // expected-note@+2 {{'ThreadLocalCoin' is false}}
  52   // expected-note@+1 {{Taking false branch}}
  53   if (ThreadLocalCoin)
  54     return;
  55
  56   *p = 4;
  57   // expected-warning@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  58   // expected-note@-2    {{Dereference of null pointer (loaded from variable 'p')}}
  59 }
  60 } // namespace GH124975