6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode

Summary: Remove DecodeNNode::decode() and EncodePNode::encode() methods.
Reviewed-by: rasbold, never

src/cpu/sparc/vm/sparc.ad

@@ -5955,7 +5955,7 @@ instruct storeA8B(memory mem, regD src) %{
 
 // Convert oop pointer into compressed form
 instruct encodeHeapOop(iRegN dst, iRegP src) %{
-  predicate(n->bottom_type()->is_narrowoop()->make_oopptr()->ptr() != TypePtr::NotNull);
+  predicate(n->bottom_type()->make_ptr()->ptr() != TypePtr::NotNull);
   match(Set dst (EncodeP src));
   format %{ "encode_heap_oop $src, $dst" %}
   ins_encode %{
@@ -5965,7 +5965,7 @@ instruct encodeHeapOop(iRegN dst, iRegP src) %{
 %}
 
 instruct encodeHeapOop_not_null(iRegN dst, iRegP src) %{
-  predicate(n->bottom_type()->is_narrowoop()->make_oopptr()->ptr() == TypePtr::NotNull);
+  predicate(n->bottom_type()->make_ptr()->ptr() == TypePtr::NotNull);
   match(Set dst (EncodeP src));
   format %{ "encode_heap_oop_not_null $src, $dst" %}
   ins_encode %{

src/cpu/x86/vm/x86_64.ad

@@ -7060,7 +7060,7 @@ instruct castP2X(rRegL dst, rRegP src)
 
 // Convert oop pointer into compressed form
 instruct encodeHeapOop(rRegN dst, rRegP src, rFlagsReg cr) %{
-  predicate(n->bottom_type()->is_narrowoop()->make_oopptr()->ptr() != TypePtr::NotNull);
+  predicate(n->bottom_type()->make_ptr()->ptr() != TypePtr::NotNull);
   match(Set dst (EncodeP src));
   effect(KILL cr);
   format %{ "encode_heap_oop $dst,$src" %}
@@ -7076,7 +7076,7 @@ instruct encodeHeapOop(rRegN dst, rRegP src, rFlagsReg cr) %{
 %}
 
 instruct encodeHeapOop_not_null(rRegN dst, rRegP src, rFlagsReg cr) %{
-  predicate(n->bottom_type()->is_narrowoop()->make_oopptr()->ptr() == TypePtr::NotNull);
+  predicate(n->bottom_type()->make_ptr()->ptr() == TypePtr::NotNull);
   match(Set dst (EncodeP src));
   effect(KILL cr);
   format %{ "encode_heap_oop_not_null $dst,$src" %}

src/share/vm/opto/cfgnode.cpp

@@ -854,7 +854,8 @@ const Type *PhiNode::Value( PhaseTransform *phase ) const {
   // Until we have harmony between classes and interfaces in the type
   // lattice, we must tread carefully around phis which implicitly
   // convert the one to the other.
-  const TypeInstPtr* ttip = _type->isa_narrowoop() ? _type->isa_narrowoop()->make_oopptr()->isa_instptr() :_type->isa_instptr();
+  const TypePtr* ttp = _type->make_ptr();
+  const TypeInstPtr* ttip = (ttp != NULL) ? ttp->isa_instptr() : NULL;
   bool is_intf = false;
   if (ttip != NULL) {
     ciKlass* k = ttip->klass();
@@ -873,7 +874,8 @@ const Type *PhiNode::Value( PhaseTransform *phase ) const {
       // of all the input types.  The lattice is not distributive in
       // such cases.  Ward off asserts in type.cpp by refusing to do
       // meets between interfaces and proper classes.
-      const TypeInstPtr* tiip = ti->isa_narrowoop() ? ti->is_narrowoop()->make_oopptr()->isa_instptr() : ti->isa_instptr();
+      const TypePtr* tip = ti->make_ptr();
+      const TypeInstPtr* tiip = (tip != NULL) ? tip->isa_instptr() : NULL;
       if (tiip) {
         bool ti_is_intf = false;
         ciKlass* k = tiip->klass();
@@ -930,13 +932,14 @@ const Type *PhiNode::Value( PhaseTransform *phase ) const {
     // class-typed Phi and an interface flows in, it's possible that the meet &
     // join report an interface back out.  This isn't possible but happens
     // because the type system doesn't interact well with interfaces.
-    const TypeInstPtr *jtip = jt->isa_narrowoop() ? jt->isa_narrowoop()->make_oopptr()->isa_instptr() : jt->isa_instptr();
+    const TypePtr *jtp = jt->make_ptr();
+    const TypeInstPtr *jtip = (jtp != NULL) ? jtp->isa_instptr() : NULL;
     if( jtip && ttip ) {
       if( jtip->is_loaded() &&  jtip->klass()->is_interface() &&
           ttip->is_loaded() && !ttip->klass()->is_interface() ) {
         // Happens in a CTW of rt.jar, 320-341, no extra flags
         assert(ft == ttip->cast_to_ptr_type(jtip->ptr()) ||
-               ft->isa_narrowoop() && ft->isa_narrowoop()->make_oopptr() == ttip->cast_to_ptr_type(jtip->ptr()), "");
+               ft->isa_narrowoop() && ft->make_ptr() == ttip->cast_to_ptr_type(jtip->ptr()), "");
         jt = ft;
       }
     }

src/share/vm/opto/compile.cpp

@@ -2017,7 +2017,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &fpu ) {
         for (uint i = 0; i < cnt; i++) {
           Node* m = r->raw_out(i);
           if (m!= NULL && m->Opcode() == Op_ConN &&
-              m->bottom_type()->is_narrowoop()->make_oopptr() == t) {
+              m->bottom_type()->make_ptr() == t) {
             nn = m;
             break;
           }
@@ -2070,7 +2070,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &fpu ) {
             }
           }
         } else if (t->isa_oopptr()) {
-          in2 = ConNode::make(C, t->is_oopptr()->make_narrowoop());
+          in2 = ConNode::make(C, t->make_narrowoop());
         }
       }
       if( in2 != NULL ) {

src/share/vm/opto/connode.cpp

@@ -570,23 +570,7 @@ const Type *DecodeNNode::Value( PhaseTransform *phase ) const {
   if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR;
 
   assert(t->isa_narrowoop(), "only  narrowoop here");
-  return t->is_narrowoop()->make_oopptr();
-}
-
-Node* DecodeNNode::decode(PhaseTransform* phase, Node* value) {
-  if (value->is_EncodeP()) {
-    // (DecodeN (EncodeP p)) -> p
-    return value->in(1);
-  }
-  const Type* newtype = value->bottom_type();
-  if (newtype == TypeNarrowOop::NULL_PTR) {
-    return phase->transform(new (phase->C, 1) ConPNode(TypePtr::NULL_PTR));
-  } else if (newtype->isa_narrowoop()) {
-    return phase->transform(new (phase->C, 2) DecodeNNode(value, newtype->is_narrowoop()->make_oopptr()));
-  } else {
-    ShouldNotReachHere();
-    return NULL; // to make C++ compiler happy.
-  }
+  return t->make_ptr();
 }
 
 Node* EncodePNode::Identity(PhaseTransform* phase) {
@@ -606,24 +590,9 @@ const Type *EncodePNode::Value( PhaseTransform *phase ) const {
   if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR;
 
   assert(t->isa_oopptr(), "only oopptr here");
-  return t->is_oopptr()->make_narrowoop();
+  return t->make_narrowoop();
 }
 
-Node* EncodePNode::encode(PhaseTransform* phase, Node* value) {
-  if (value->is_DecodeN()) {
-    // (EncodeP (DecodeN p)) -> p
-    return value->in(1);
-  }
-  const Type* newtype = value->bottom_type();
-  if (newtype == TypePtr::NULL_PTR) {
-    return phase->transform(new (phase->C, 1) ConNNode(TypeNarrowOop::NULL_PTR));
-  } else if (newtype->isa_oopptr()) {
-    return phase->transform(new (phase->C, 2) EncodePNode(value, newtype->is_oopptr()->make_narrowoop()));
-  } else {
-    ShouldNotReachHere();
-    return NULL; // to make C++ compiler happy.
-  }
-}
 
 Node *EncodePNode::Ideal_DU_postCCP( PhaseCCP *ccp ) {
   return MemNode::Ideal_common_DU_postCCP(ccp, this, in(1));

src/share/vm/opto/connode.hpp

@@ -280,7 +280,6 @@ class EncodePNode : public TypeNode {
   virtual const Type *Value( PhaseTransform *phase ) const;
   virtual uint  ideal_reg() const { return Op_RegN; }
 
-  static Node* encode(PhaseTransform* phase, Node* value);
   virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp );
 };
 
@@ -300,8 +299,6 @@ class DecodeNNode : public TypeNode {
   virtual Node *Identity( PhaseTransform *phase );
   virtual const Type *Value( PhaseTransform *phase ) const;
   virtual uint  ideal_reg() const { return Op_RegP; }
-
-  static Node* decode(PhaseTransform* phase, Node* value);
 };
 
 //------------------------------Conv2BNode-------------------------------------

src/share/vm/opto/escape.cpp

@@ -962,13 +962,8 @@ void ConnectionGraph::split_unique_types(GrowableArray<Node *>  &alloc_worklist)
         assert(tinst != NULL && tinst->is_instance() &&
                tinst->instance_id() == elem , "instance type expected.");
 
-        const TypeOopPtr *tn_t = NULL;
         const Type *tn_type = igvn->type(tn);
-        if (tn_type->isa_narrowoop()) {
-          tn_t = tn_type->is_narrowoop()->make_oopptr()->isa_oopptr();
-        } else {
-          tn_t = tn_type->isa_oopptr();
-        }
+        const TypeOopPtr *tn_t = tn_type->make_ptr()->isa_oopptr();
 
         if (tn_t != NULL &&
  tinst->cast_to_instance(TypeOopPtr::UNKNOWN_INSTANCE)->higher_equal(tn_t)) {
@@ -1921,9 +1916,7 @@ void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase)
     case Op_StoreN:
     {
       const Type *adr_type = phase->type(n->in(MemNode::Address));
-      if (adr_type->isa_narrowoop()) {
-        adr_type = adr_type->is_narrowoop()->make_oopptr();
-      }
+      adr_type = adr_type->make_ptr();
       if (adr_type->isa_oopptr()) {
         add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false);
       } else {
@@ -1948,9 +1941,7 @@ void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase)
     case Op_CompareAndSwapN:
     {
       const Type *adr_type = phase->type(n->in(MemNode::Address));
-      if (adr_type->isa_narrowoop()) {
-        adr_type = adr_type->is_narrowoop()->make_oopptr();
-      }
+      adr_type = adr_type->make_ptr();
       if (adr_type->isa_oopptr()) {
         add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false);
       } else {
@@ -2131,10 +2122,7 @@ void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) {
     case Op_CompareAndSwapN:
     {
       Node *adr = n->in(MemNode::Address);
-      const Type *adr_type = phase->type(adr);
-      if (adr_type->isa_narrowoop()) {
-        adr_type = adr_type->is_narrowoop()->make_oopptr();
-      }
+      const Type *adr_type = phase->type(adr)->make_ptr();
 #ifdef ASSERT
       if (!adr_type->isa_oopptr())
         assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP");

src/share/vm/opto/library_call.cpp

@@ -2194,9 +2194,10 @@ bool LibraryCallKit::inline_unsafe_CAS(BasicType type) {
     pre_barrier(control(), base, adr, alias_idx, newval, value_type, T_OBJECT);
 #ifdef _LP64
     if (adr->bottom_type()->is_ptr_to_narrowoop()) {
+      Node *newval_enc = _gvn.transform(new (C, 2) EncodePNode(newval, newval->bottom_type()->make_narrowoop()));
+      Node *oldval_enc = _gvn.transform(new (C, 2) EncodePNode(oldval, oldval->bottom_type()->make_narrowoop()));
       cas = _gvn.transform(new (C, 5) CompareAndSwapNNode(control(), mem, adr,
-                                                           EncodePNode::encode(&_gvn, newval),
-                                                           EncodePNode::encode(&_gvn, oldval)));
+                                                          newval_enc, oldval_enc));
     } else
 #endif
     {

src/share/vm/opto/machnode.cpp

@@ -262,19 +262,19 @@ const Node* MachNode::get_base_and_disp(intptr_t &offset, const TypePtr* &adr_ty
     // Now we have collected every part of the ADLC MEMORY_INTER.
     // See if it adds up to a base + offset.
     if (index != NULL) {
-      const TypeNarrowOop* narrowoop = index->bottom_type()->isa_narrowoop();
-      if (narrowoop != NULL) { // EncodeN, LoadN, LoadConN, LoadNKlass.
+      const Type* t_index = index->bottom_type();
+      if (t_index->isa_narrowoop()) { // EncodeN, LoadN, LoadConN, LoadNKlass.
         // Memory references through narrow oops have a
         // funny base so grab the type from the index:
         // [R12 + narrow_oop_reg<<3 + offset]
         assert(base == NULL, "Memory references through narrow oops have no base");
         offset = disp;
-        adr_type = narrowoop->make_oopptr()->add_offset(offset);
+        adr_type = t_index->make_ptr()->add_offset(offset);
         return NULL;
       } else if (!index->is_Con()) {
         disp = Type::OffsetBot;
       } else if (disp != Type::OffsetBot) {
-        const TypeX* ti = index->bottom_type()->isa_intptr_t();
+        const TypeX* ti = t_index->isa_intptr_t();
         if (ti == NULL) {
           disp = Type::OffsetBot;  // a random constant??
         } else {

src/share/vm/opto/macro.cpp

@@ -598,7 +598,7 @@ bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <Sa
           field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
         }
         if (UseCompressedOops) {
-          field_type = field_type->is_oopptr()->make_narrowoop();
+          field_type = field_type->make_narrowoop();
           basic_elem_type = T_NARROWOOP;
         }
       } else {
@@ -666,9 +666,11 @@ bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <Sa
       if (UseCompressedOops && field_type->isa_narrowoop()) {
         // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
         // to be able scalar replace the allocation.
-        _igvn.set_delay_transform(false);
-        field_val = DecodeNNode::decode(&_igvn, field_val);
-        _igvn.set_delay_transform(true);
+        if (field_val->is_EncodeP()) {
+          field_val = field_val->in(1);
+        } else {
+          field_val = transform_later(new (C, 2) DecodeNNode(field_val, field_val->bottom_type()->make_ptr()));
+        }
       }
       sfpt->add_req(field_val);
     }

src/share/vm/opto/matcher.cpp

@@ -1766,8 +1766,8 @@ void Matcher::find_shared( Node *n ) {
       }
       case Op_ConN: {  // Convert narrow pointers above the centerline to NUL
         TypeNode *tn = n->as_Type(); // Constants derive from type nodes
-        const TypePtr* tp = tn->type()->is_narrowoop()->make_oopptr();
-        if (tp->_ptr == TypePtr::AnyNull) {
+        const TypePtr* tp = tn->type()->make_ptr();
+        if (tp && tp->_ptr == TypePtr::AnyNull) {
           tn->set_type(TypeNarrowOop::NULL_PTR);
         }
         break;

src/share/vm/opto/memnode.cpp

@@ -769,15 +769,8 @@ Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const Type
   case T_OBJECT:
 #ifdef _LP64
     if (adr->bottom_type()->is_ptr_to_narrowoop()) {
-      const TypeNarrowOop* narrowtype;
-      if (rt->isa_narrowoop()) {
-        narrowtype = rt->is_narrowoop();
-      } else {
-        narrowtype = rt->is_oopptr()->make_narrowoop();
-      }
-      Node* load  = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, narrowtype));
-
-      return DecodeNNode::decode(&gvn, load);
+      Node* load  = gvn.transform(new (C, 3) LoadNNode(ctl, mem, adr, adr_type, rt->make_narrowoop()));
+      return new (C, 2) DecodeNNode(load, load->bottom_type()->make_ptr());
     } else
 #endif
     {
@@ -1631,9 +1624,8 @@ Node *LoadKlassNode::make( PhaseGVN& gvn, Node *mem, Node *adr, const TypePtr* a
   assert(adr_type != NULL, "expecting TypeOopPtr");
 #ifdef _LP64
   if (adr_type->is_ptr_to_narrowoop()) {
-    const TypeNarrowOop* narrowtype = tk->is_oopptr()->make_narrowoop();
-    Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, narrowtype));
-    return DecodeNNode::decode(&gvn, load_klass);
+    Node* load_klass = gvn.transform(new (C, 3) LoadNKlassNode(ctl, mem, adr, at, tk->make_narrowoop()));
+    return new (C, 2) DecodeNNode(load_klass, load_klass->bottom_type()->make_ptr());
   }
 #endif
   assert(!adr_type->is_ptr_to_narrowoop(), "should have got back a narrow oop");
@@ -1843,15 +1835,10 @@ Node* LoadNode::klass_identity_common(PhaseTransform *phase ) {
 //------------------------------Value------------------------------------------
 const Type *LoadNKlassNode::Value( PhaseTransform *phase ) const {
   const Type *t = klass_value_common(phase);
-
-  if (t == TypePtr::NULL_PTR) {
-    return TypeNarrowOop::NULL_PTR;
-  }
-  if (t != Type::TOP && !t->isa_narrowoop()) {
-    assert(t->is_oopptr(), "sanity");
-    t = t->is_oopptr()->make_narrowoop();
-  }
+  if (t == Type::TOP)
     return t;
+
+  return t->make_narrowoop();
 }
 
 //------------------------------Identity---------------------------------------
@@ -1864,7 +1851,7 @@ Node* LoadNKlassNode::Identity( PhaseTransform *phase ) {
   if( t == Type::TOP ) return x;
   if( t->isa_narrowoop()) return x;
 
-  return EncodePNode::encode(phase, x);
+  return phase->transform(new (phase->C, 2) EncodePNode(x, t->make_narrowoop()));
 }
 
 //------------------------------Value-----------------------------------------
@@ -1930,9 +1917,8 @@ StoreNode* StoreNode::make( PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, cons
     if (adr->bottom_type()->is_ptr_to_narrowoop() ||
         (UseCompressedOops && val->bottom_type()->isa_klassptr() &&
          adr->bottom_type()->isa_rawptr())) {
-      const TypePtr* type = val->bottom_type()->is_ptr();
-      Node* cp = EncodePNode::encode(&gvn, val);
-      return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, cp);
+      val = gvn.transform(new (C, 2) EncodePNode(val, val->bottom_type()->make_narrowoop()));
+      return new (C, 4) StoreNNode(ctl, mem, adr, adr_type, val);
     } else
 #endif
     {

src/share/vm/opto/parse2.cpp

@@ -67,12 +67,9 @@ Node* Parse::array_addressing(BasicType type, int vals, const Type* *result2) {
   const Type*       elemtype = arytype->elem();
 
   if (UseUniqueSubclasses && result2 != NULL) {
-    const Type* el = elemtype;
-    if (elemtype->isa_narrowoop()) {
-      el = elemtype->is_narrowoop()->make_oopptr();
-    }
-    const TypeInstPtr* toop = el->isa_instptr();
-    if (toop) {
+    const Type* el = elemtype->make_ptr();
+    if (el && el->isa_instptr()) {
+      const TypeInstPtr* toop = el->is_instptr();
       if (toop->klass()->as_instance_klass()->unique_concrete_subklass()) {
         // If we load from "AbstractClass[]" we must see "ConcreteSubClass".
         const Type* subklass = Type::get_const_type(toop->klass());

src/share/vm/opto/subnode.cpp

@@ -743,8 +743,8 @@ Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) {
 // Simplify an CmpN (compare 2 pointers) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpNNode::sub( const Type *t1, const Type *t2 ) const {
-  const TypePtr *r0 = t1->is_narrowoop()->make_oopptr(); // Handy access
-  const TypePtr *r1 = t2->is_narrowoop()->make_oopptr();
+  const TypePtr *r0 = t1->make_ptr(); // Handy access
+  const TypePtr *r1 = t2->make_ptr();
 
   // Undefined inputs makes for an undefined result
   if( TypePtr::above_centerline(r0->_ptr) ||

src/share/vm/opto/superword.cpp

@@ -1424,9 +1424,9 @@ int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) {
 //---------------------------container_type---------------------------
 // Smallest type containing range of values
 const Type* SuperWord::container_type(const Type* t) {
-  if (t->isa_narrowoop()) t = t->is_narrowoop()->make_oopptr();
-  if (t->isa_aryptr()) {
-    t = t->is_aryptr()->elem();
+  const Type* tp = t->make_ptr();
+  if (tp && tp->isa_aryptr()) {
+    t = tp->is_aryptr()->elem();
   }
   if (t->basic_type() == T_INT) {
     if (t->higher_equal(TypeInt::BOOL))  return TypeInt::BOOL;

src/share/vm/opto/type.cpp

@@ -168,7 +168,20 @@ const Type* Type::get_typeflow_type(ciType* type) {
 const Type *Type::make( enum TYPES t ) {
   return (new Type(t))->hashcons();
 }
+/*
+//------------------------------make_ptr---------------------------------------
+// Returns this ptr type or the equivalent ptr type for this compressed pointer.
+const TypePtr* Type::make_ptr() const {
+  return (_base == NarrowOop) ? is_narrowoop()->make_oopptr() : is_ptr();
+}
 
+//------------------------------make_narrowoop---------------------------------
+// Returns this compressed pointer or the equivalent compressed version
+// of this pointer type.
+const TypeNarrowOop* Type::make_narrowoop() const {
+  return (_base == NarrowOop) ? is_narrowoop() : TypeNarrowOop::make(is_ptr());
+}
+*/
 //------------------------------cmp--------------------------------------------
 int Type::cmp( const Type *const t1, const Type *const t2 ) {
   if( t1->_base != t2->_base )
@@ -491,14 +504,8 @@ bool Type::is_nan()    const {
 // commutative and the lattice is symmetric.
 const Type *Type::meet( const Type *t ) const {
   if (isa_narrowoop() && t->isa_narrowoop()) {
-    const Type* result = is_narrowoop()->make_oopptr()->meet(t->is_narrowoop()->make_oopptr());
-    if (result->isa_oopptr()) {
-      return result->isa_oopptr()->make_narrowoop();
-    } else if (result == TypePtr::NULL_PTR) {
-      return TypeNarrowOop::NULL_PTR;
-    } else {
-      return result;
-    }
+    const Type* result = make_ptr()->meet(t->make_ptr());
+    return result->make_narrowoop();
   }
 
   const Type *mt = xmeet(t);
@@ -1764,7 +1771,7 @@ inline const TypeInt* normalize_array_size(const TypeInt* size) {
 //------------------------------make-------------------------------------------
 const TypeAry *TypeAry::make( const Type *elem, const TypeInt *size) {
   if (UseCompressedOops && elem->isa_oopptr()) {
-    elem = elem->is_oopptr()->make_narrowoop();
+    elem = elem->make_narrowoop();
   }
   size = normalize_array_size(size);
   return (TypeAry*)(new TypeAry(elem,size))->hashcons();
@@ -1849,9 +1856,8 @@ bool TypeAry::ary_must_be_exact() const {
   if (_elem == BOTTOM)      return false;  // general array not exact
   if (_elem == TOP   )      return false;  // inverted general array not exact
   const TypeOopPtr*  toop = NULL;
-  if (UseCompressedOops) {
-    const TypeNarrowOop* noop = _elem->isa_narrowoop();
-    if (noop) toop = noop->make_oopptr()->isa_oopptr();
+  if (UseCompressedOops && _elem->isa_narrowoop()) {
+    toop = _elem->make_ptr()->isa_oopptr();
   } else {
     toop = _elem->isa_oopptr();
   }
@@ -1861,16 +1867,18 @@ bool TypeAry::ary_must_be_exact() const {
   if (!tklass->is_loaded()) return false;  // unloaded class
   const TypeInstPtr* tinst;
   if (_elem->isa_narrowoop())
-    tinst = _elem->is_narrowoop()->make_oopptr()->isa_instptr();
+    tinst = _elem->make_ptr()->isa_instptr();
   else
     tinst = _elem->isa_instptr();
-  if (tinst)                return tklass->as_instance_klass()->is_final();
+  if (tinst)
+    return tklass->as_instance_klass()->is_final();
   const TypeAryPtr*  tap;
   if (_elem->isa_narrowoop())
-    tap = _elem->is_narrowoop()->make_oopptr()->isa_aryptr();
+    tap = _elem->make_ptr()->isa_aryptr();
   else
     tap = _elem->isa_aryptr();
-  if (tap)                  return tap->ary()->ary_must_be_exact();
+  if (tap)
+    return tap->ary()->ary_must_be_exact();
   return false;
 }
 
@@ -2579,10 +2587,6 @@ const TypePtr *TypeOopPtr::add_offset( int offset ) const {
   return make( _ptr, xadd_offset(offset) );
 }
 
-const TypeNarrowOop* TypeOopPtr::make_narrowoop() const {
-  return TypeNarrowOop::make(this);
-}
-
 int TypeOopPtr::meet_instance(int iid) const {
   if (iid == 0) {
     return (_instance_id < 0)  ? _instance_id : UNKNOWN_INSTANCE;
@@ -3494,7 +3498,7 @@ const Type *TypeNarrowOop::xmeet( const Type *t ) const {
     return this;
 
   case NarrowOop: {
-    const Type* result = _ooptype->xmeet(t->is_narrowoop()->make_oopptr());
+    const Type* result = _ooptype->xmeet(t->make_ptr());
     if (result->isa_ptr()) {
       return TypeNarrowOop::make(result->is_ptr());
     }
@@ -3604,7 +3608,7 @@ ciKlass* TypeAryPtr::klass() const {
   const TypeAryPtr *tary;
   const Type* el = elem();
   if (el->isa_narrowoop()) {
-    el = el->is_narrowoop()->make_oopptr();
+    el = el->make_ptr();
   }
 
   // Get element klass

src/share/vm/opto/type.hpp

@@ -225,6 +225,12 @@ public:
   virtual bool      is_finite() const;           // Has a finite value
   virtual bool      is_nan()    const;           // Is not a number (NaN)
 
+  // Returns this ptr type or the equivalent ptr type for this compressed pointer.
+  const TypePtr* make_ptr() const;
+  // Returns this compressed pointer or the equivalent compressed version
+  // of this pointer type.
+  const TypeNarrowOop* make_narrowoop() const;
+
   // Special test for register pressure heuristic
   bool is_floatingpoint() const;        // True if Float or Double base type
 
@@ -718,9 +724,6 @@ public:
 
   virtual const TypePtr *add_offset( int offset ) const;
 
-  // returns the equivalent compressed version of this pointer type
-  virtual const TypeNarrowOop* make_narrowoop() const;
-
   virtual const Type *xmeet( const Type *t ) const;
   virtual const Type *xdual() const;    // Compute dual right now.
 
@@ -911,7 +914,7 @@ public:
 // between the normal and the compressed form.
 class TypeNarrowOop : public Type {
 protected:
-  const TypePtr* _ooptype;
+  const TypePtr* _ooptype; // Could be TypePtr::NULL_PTR
 
   TypeNarrowOop( const TypePtr* ooptype): Type(NarrowOop),
     _ooptype(ooptype) {
@@ -940,8 +943,8 @@ public:
     return make(TypeOopPtr::make_from_constant(con));
   }
 
-  // returns the equivalent oopptr type for this compressed pointer
-  virtual const TypePtr *make_oopptr() const {
+  // returns the equivalent ptr type for this compressed pointer
+  const TypePtr *make_oopptr() const {
     return _ooptype;
   }
 
@@ -1128,6 +1131,16 @@ inline const TypeKlassPtr *Type::is_klassptr() const {
   return (TypeKlassPtr*)this;
 }
 
+inline const TypePtr* Type::make_ptr() const {
+  return (_base == NarrowOop) ? is_narrowoop()->make_oopptr() :
+                                (isa_ptr() ? is_ptr() : NULL);
+}
+
+inline const TypeNarrowOop* Type::make_narrowoop() const {
+  return (_base == NarrowOop) ? is_narrowoop() :
+                                (isa_ptr() ? TypeNarrowOop::make(is_ptr()) : NULL);
+}
+
 inline bool Type::is_floatingpoint() const {
   if( (_base == FloatCon)  || (_base == FloatBot) ||
       (_base == DoubleCon) || (_base == DoubleBot) )