clang/test/Analysis/diagnostics/dtors.cpp

   1 // RUN: %clang_analyze_cc1 -std=c++14 -w -analyzer-checker=core,cplusplus -analyzer-output=text -verify %s
   2
   3 namespace no_crash_on_delete_dtor {
   4 // We were crashing when producing diagnostics for this code, but not for the
   5 // report that it currently emits. Instead, Static Analyzer was thinking that
   6 // p.get()->foo() is a null dereference because it was dropping
   7 // constraints over x too early and took a different branch next time
   8 // we call .get().
   9 struct S {
  10   void foo();
  11   ~S();
  12 };
  13
  14 struct smart_ptr {
  15   int x;
  16   S *s;
  17   smart_ptr(S *);
  18   S *get() {
  19     return (x || 0) ? nullptr : s; // expected-note{{Field 'x' is 0}}
  20                                    // expected-note@-1{{Left side of '||' is false}}
  21                                    // expected-note@-2{{'?' condition is false}}
  22                                    // expected-warning@-3{{Use of memory after it is freed}}
  23                                    // expected-note@-4{{Use of memory after it is freed}}
  24   }
  25 };
  26
  27 void bar(smart_ptr p) {
  28   delete p.get(); // expected-note{{Memory is released}}
  29   p.get()->foo(); // expected-note{{Calling 'smart_ptr::get'}}
  30 }
  31 } // namespace no_crash_on_delete_dtor