Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP

 #define SHARE_VM_OOPS_ARRAYKLASS_HPP

 #include "memory/universe.hpp"

 #include "oops/klass.hpp"

 class klassVtable;

 // ArrayKlass is the abstract baseclass for all array classes

 class ArrayKlass: public Klass {

   friend class VMStructs;

  private:

   int      _dimension;         // This is n'th-dimensional array.

   Klass* volatile _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).

   Klass* volatile _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).

   int      _vtable_len;        // size of vtable for this klass

   juint    _alloc_size;        // allocation profiling support

   oop      _component_mirror;  // component type, as a java/lang/Class

  protected:

   // Constructors

   // The constructor with the Symbol argument does the real array

   // initialization, the other is a dummy

   ArrayKlass(Symbol* name);

   ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }

  public:

   // Testing operation

   bool oop_is_array_slow() const { return true; }

   // Instance variables

   int dimension() const                 { return _dimension;      }

   void set_dimension(int dimension)     { _dimension = dimension; }

   Klass* higher_dimension() const     { return _higher_dimension; }

   void set_higher_dimension(Klass* k) { _higher_dimension = k; }

   Klass** adr_higher_dimension()      { return (Klass**)&this->_higher_dimension;}

   Klass* lower_dimension() const      { return _lower_dimension; }

   void set_lower_dimension(Klass* k)  { _lower_dimension = k; }

   Klass** adr_lower_dimension()       { return (Klass**)&this->_lower_dimension;}

   // Allocation profiling support

   juint alloc_size() const              { return _alloc_size; }

   void set_alloc_size(juint n)          { _alloc_size = n; }

   // offset of first element, including any padding for the sake of alignment

   int  array_header_in_bytes() const    { return layout_helper_header_size(layout_helper()); }

   int  log2_element_size() const        { return layout_helper_log2_element_size(layout_helper()); }

   // type of elements (T_OBJECT for both oop arrays and array-arrays)

   BasicType element_type() const        { return layout_helper_element_type(layout_helper()); }

   oop  component_mirror() const         { return _component_mirror; }

   void set_component_mirror(oop m)      { klass_oop_store(&_component_mirror, m); }

   oop* adr_component_mirror()           { return (oop*)&this->_component_mirror;}

   // Compiler/Interpreter offset

   static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(ArrayKlass, _component_mirror)); }

   virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); }

   // Allocation

   // Sizes points to the first dimension of the array, subsequent dimensions

   // are always in higher memory.  The callers of these set that up.

   virtual oop multi_allocate(int rank, jint* sizes, TRAPS);

   objArrayOop allocate_arrayArray(int n, int length, TRAPS);

   // Lookup operations

   Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;

   // Casting from Klass*

   static ArrayKlass* cast(Klass* k) {

     assert(k->oop_is_array(), "cast to ArrayKlass");

     return (ArrayKlass*) k;

   }

   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);

   bool compute_is_subtype_of(Klass* k);

   // Sizing

   static int header_size()                 { return sizeof(ArrayKlass)/HeapWordSize; }

   static int static_size(int header_size);

 #if INCLUDE_SERVICES

   virtual void collect_statistics(KlassSizeStats *sz) const {

     Klass::collect_statistics(sz);

     // Do nothing for now, but remember to modify if you add new

     // stuff to ArrayKlass.

   }

 #endif

   // Java vtable

   klassVtable* vtable() const;             // return new klassVtable

   int  vtable_length() const               { return _vtable_len; }

   static int base_vtable_length()          { return Universe::base_vtable_size(); }

   void set_vtable_length(int len)          { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }

  protected:

   inline intptr_t* start_of_vtable() const;

  public:

   // Iterators

   void array_klasses_do(void f(Klass* k));

   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);

   void with_array_klasses_do(void f(Klass* k));

   // GC support

   virtual void oops_do(OopClosure* cl);

   // Return a handle.

   static void     complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS);

   // jvm support

   jint compute_modifier_flags(TRAPS) const;

   // JVMTI support

   jint jvmti_class_status() const;

   // CDS support - remove and restore oops from metadata. Oops are not shared.

   virtual void remove_unshareable_info();

   virtual void restore_unshareable_info(TRAPS);

   // Printing

   void print_on(outputStream* st) const;

   void print_value_on(outputStream* st) const;

   void oop_print_on(oop obj, outputStream* st);

   // Verification

   void verify_on(outputStream* st);

   void oop_verify_on(oop obj, outputStream* st);

 };

 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP