lldb/test/API/functionalities/vtable/main.cpp

   1 class Shape {
   2 public:
   3   virtual double Area() { return 1.0; }
   4   virtual double Perimeter() { return 1.0; }
   5   // Note that destructors generate two entries in the vtable: base object
   6   // destructor and deleting destructor.
   7   virtual ~Shape() = default;
   8 };
   9
  10 class Rectangle : public Shape {
  11 public:
  12   ~Rectangle() override = default;
  13   double Area() override { return 2.0; }
  14   double Perimeter() override { return 2.0; }
  15   virtual void RectangleOnly() {}
  16   // This *shouldn't* show up in the vtable.
  17   void RectangleSpecific() { return; }
  18 };
  19
  20 // Make a class that looks like it would be virtual because the first ivar is
  21 // a virtual class and if we inspect memory at the address of this class it
  22 // would appear to be a virtual class. We need to make sure we don't get a
  23 // valid vtable from this object.
  24 class NotVirtual {
  25   Rectangle m_rect;
  26 public:
  27   NotVirtual() = default;
  28 };
  29
  30 int main(int argc, const char **argv) {
  31   Shape shape;
  32   Rectangle rect;
  33   Shape *shape_ptr = &rect;
  34   Shape &shape_ref = shape;
  35   shape_ptr = &shape; // Shape is Rectangle
  36   NotVirtual not_virtual; // Shape is Shape
  37   return 0; // At the end
  38 }