Пример #1
0
// Revised lookup semantics   introduced 1.3 (Kestral beta)
void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) {

  // Note:  Arrays can have intermediate array supers.  Use java_super to skip them.
  KlassHandle super (THREAD, klass()->java_super());
  int nofNewEntries = 0;


  if (PrintVtables && !klass()->oop_is_array()) {
    ResourceMark rm(THREAD);
    tty->print_cr("Initializing: %s", _klass->name()->as_C_string());
  }

#ifdef ASSERT
  oop* end_of_obj = (oop*)_klass() + _klass()->size();
  oop* end_of_vtable = (oop*)&table()[_length];
  assert(end_of_vtable <= end_of_obj, "vtable extends beyond end");
#endif

  if (Universe::is_bootstrapping()) {
    // just clear everything
    for (int i = 0; i < _length; i++) table()[i].clear();
    return;
  }

  int super_vtable_len = initialize_from_super(super);
  if (klass()->oop_is_array()) {
    assert(super_vtable_len == _length, "arrays shouldn't introduce new methods");
  } else {
    assert(_klass->oop_is_instance(), "must be instanceKlass");

    objArrayHandle methods(THREAD, ik()->methods());
    int len = methods()->length();
    int initialized = super_vtable_len;

    // update_inherited_vtable can stop for gc - ensure using handles
    for (int i = 0; i < len; i++) {
      HandleMark hm(THREAD);
      assert(methods()->obj_at(i)->is_method(), "must be a methodOop");
      methodHandle mh(THREAD, (methodOop)methods()->obj_at(i));

      bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK);

      if (needs_new_entry) {
        put_method_at(mh(), initialized);
        mh()->set_vtable_index(initialized); // set primary vtable index
        initialized++;
      }
    }

    // add miranda methods; it will also update the value of initialized
    fill_in_mirandas(initialized);

    // In class hierarchies where the accessibility is not increasing (i.e., going from private ->
    // package_private -> publicprotected), the vtable might actually be smaller than our initial
    // calculation.
    assert(initialized <= _length, "vtable initialization failed");
    for(;initialized < _length; initialized++) {
      put_method_at(NULL, initialized);
    }
    NOT_PRODUCT(verify(tty, true));
  }
}
Пример #2
0
inline instanceKlass* klassVtable::ik() const {
  Klass* k = _klass()->klass_part();
  assert(k->oop_is_instance(), "not an instanceKlass");
  return (instanceKlass*)k;
}
Пример #3
0
 // accessors
 vtableEntry* table() const      { return (vtableEntry*)(address(_klass()) + _tableOffset); }