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      1 //===-------------------------- test_aux_runtime.cpp ----------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #include <typeinfo>
     11 #include <stdio.h>
     12 
     13 //  Test taken from 5.2.8.2
     14 //  When typeid is applied to a glvalue expression whose type is a polymorphic
     15 //  class type, (10.3), the result refers to a std::type_info object
     16 //  representing the type of the most derived object (1.8) (that is, the
     17 //  dynamic type) to which the glvalue refers. If the glvalue expression is
     18 //  obtained by applying the unary * operator to a pointer(68) and the pointer
     19 //  is a null pointer value (4.10), the typeid expression throws the
     20 //  std::bad_typeid exception (18.7.3).
     21 //
     22 //  68) If p is an expression of pointer type, then *p, (*p), *(p),
     23 //      ((*p)), *((p)), and so on all meet this requirement.
     24 bool bad_typeid_test () {
     25     class A { virtual void f() {}};
     26     class B { virtual void g() {}};
     27 
     28     B *bp = NULL;
     29     try {bool b = typeid(*bp) == typeid (A); }
     30     catch ( const std::bad_typeid &bc ) { return true; }
     31     return false;
     32     }
     33 
     34 
     35 //  The value of a failed cast to pointer type is the null pointer value of
     36 //  the required result type. A failed cast to reference type throws
     37 //  std::bad_cast (18.7.2).
     38 bool bad_cast_test () {
     39     class A { virtual void f() {}};
     40     class B { virtual void g() {}};
     41     class D : public virtual A, private B {};
     42 
     43     D d;
     44     B *bp = (B*)&d;     // cast needed to break protection
     45     try { D &dr = dynamic_cast<D&> (*bp); }
     46     catch ( const std::bad_cast &bc ) { return true; }
     47     return false;
     48     }
     49 
     50 int main ( int argc, char *argv [] ) {
     51     int ret_val = 0;
     52 
     53     if ( !bad_typeid_test ()) {
     54         fprintf(stderr, "TypeID test failed!\n");
     55         ret_val = 1;
     56     }
     57 
     58     if ( !bad_cast_test ()) {
     59         fprintf(stderr, "Bad cast test failed!\n");
     60         ret_val = 1;
     61     }
     62 
     63     return ret_val;
     64     }
     65