src/share/vm/opto/graphKit.cpp

*** 2563,2573 ****
    // For some types like interfaces the following loadKlass is from a 1-word
    // cache which is mutable so can't use immutable memory.  Other
    // types load from the super-class display table which is immutable.
    m = mem->memory_at(C->get_alias_index(gvn->type(p2)->is_ptr()));
    Node *kmem = might_be_cache ? m : C->immutable_memory();
!   Node *nkls = gvn->transform(LoadKlassNode::make(*gvn, NULL, kmem, p2, gvn->type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL));
  
    // Compile speed common case: ARE a subtype and we canNOT fail
    if( superklass == nkls )
      return C->top();             // false path is dead; no test needed.
  
--- 2563,2573 ----
    // For some types like interfaces the following loadKlass is from a 1-word
    // cache which is mutable so can't use immutable memory.  Other
    // types load from the super-class display table which is immutable.
    m = mem->memory_at(C->get_alias_index(gvn->type(p2)->is_ptr()));
    Node *kmem = might_be_cache ? m : C->immutable_memory();
!   Node *nkls = gvn->transform(LoadKlassNode::make(*gvn, NULL, kmem, p2, gvn->type(p2)->is_ptr(), TypeKlassPtr::BOTTOM));
  
    // Compile speed common case: ARE a subtype and we canNOT fail
    if( superklass == nkls )
      return C->top();             // false path is dead; no test needed.
  
*** 2915,2924 ****
--- 2915,2925 ----
  // uncommon trap or exception is thrown.
  Node* GraphKit::gen_checkcast(Node *obj, Node* superklass,
                                Node* *failure_control) {
    kill_dead_locals();           // Benefit all the uncommon traps
    const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr();
+   assert(tk->is_loaded(), "must be loaded");
    const Type *toop = TypeOopPtr::make_from_klass(tk->klass());
  
    // Fast cutout:  Check the case that the cast is vacuously true.
    // This detects the common cases where the test will short-circuit
    // away completely.  We do this before we perform the null check,
*** 3221,3230 ****
--- 3222,3232 ----
  // almost always feature constant types.
  Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) {
    const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr();
    if (!StressReflectiveCode && inst_klass != NULL) {
      ciKlass* klass = inst_klass->klass();
+     assert(klass != NULL, "klass should not be NULL");
      bool    xklass = inst_klass->klass_is_exact();
      if (xklass || klass->is_array_klass()) {
        jint lhelper = klass->layout_helper();
        if (lhelper != Klass::_lh_neutral_value) {
          constant_value = lhelper;