hotspot/src/share/vm/oops/constantPoolKlass.hpp
author coleenp
Sun, 13 Apr 2008 17:43:42 -0400
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permissions -rw-r--r--
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
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/*
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 * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// A constantPoolKlass is the klass of a constantPoolOop
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class constantPoolKlass : public Klass {
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  juint    _alloc_size;        // allocation profiling support
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  // Dispatched klass operations
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  bool oop_is_constantPool() const  { return true; }
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  int oop_size(oop obj) const;
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  int klass_oop_size() const        { return object_size(); }
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  // Allocation
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  DEFINE_ALLOCATE_PERMANENT(constantPoolKlass);
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  constantPoolOop allocate(int length, TRAPS);
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  static klassOop create_klass(TRAPS);
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  // Casting from klassOop
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  static constantPoolKlass* cast(klassOop k) {
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    assert(k->klass_part()->oop_is_constantPool(), "cast to constantPoolKlass");
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    return (constantPoolKlass*) k->klass_part();
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  }
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  // Sizing
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  static int header_size()        { return oopDesc::header_size() + sizeof(constantPoolKlass)/HeapWordSize; }
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  int object_size() const        { return align_object_size(header_size()); }
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  // Garbage collection
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  void oop_follow_contents(oop obj);
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  int oop_adjust_pointers(oop obj);
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  // Parallel Scavenge and Parallel Old
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  PARALLEL_GC_DECLS
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  // Iterators
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  int oop_oop_iterate(oop obj, OopClosure* blk);
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  int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
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  // Allocation profiling support
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  // no idea why this is pure virtual and not in Klass ???
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  juint alloc_size() const              { return _alloc_size; }
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  void set_alloc_size(juint n)          { _alloc_size = n; }
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#ifndef PRODUCT
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  // Printing
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  void oop_print_on(oop obj, outputStream* st);
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#endif
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  // Verification
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  const char* internal_name() const;
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  void oop_verify_on(oop obj, outputStream* st);
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  // tells whether obj is partially constructed (gc during class loading)
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  bool oop_partially_loaded(oop obj) const;
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  void oop_set_partially_loaded(oop obj);
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#ifndef PRODUCT
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  // Compile the world support
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  static void preload_and_initialize_all_classes(oop constant_pool, TRAPS);
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#endif
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};