hotspot/src/share/vm/ci/ciBaseObject.hpp
author coleenp
Sat, 01 Sep 2012 13:25:18 -0400
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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
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/*
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 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_CI_CIBASEOBJECT_HPP
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#define SHARE_VM_CI_CIBASEOBJECT_HPP
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#include "ci/ciClassList.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/handles.hpp"
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#include "runtime/jniHandles.hpp"
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// ciBaseObject
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//
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// This class represents an oop in the HotSpot virtual machine.
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// Its subclasses are structured in a hierarchy which mirrors
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// an aggregate of the VM's oop and klass hierarchies (see
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// oopHierarchy.hpp).  Each instance of ciBaseObject holds a handle
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// to a corresponding oop on the VM side and provides routines
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// for accessing the information in its oop.  By using the ciBaseObject
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// hierarchy for accessing oops in the VM, the compiler ensures
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// that it is safe with respect to garbage collection; that is,
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// GC and compilation can proceed independently without
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// interference.
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//
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// Within the VM, the oop and klass hierarchies are separate.
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// The compiler interface does not preserve this separation --
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// the distinction between `Klass*' and `Klass' are not
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// reflected in the interface and instead the Klass hierarchy
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// is directly modeled as the subclasses of ciKlass.
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class ciBaseObject : public ResourceObj {
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  CI_PACKAGE_ACCESS
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  friend class ciEnv;
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protected:
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  uint     _ident;
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  enum { FLAG_BITS   = 1 };
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  enum {
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         SCAVENGABLE_FLAG = 1
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       };
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protected:
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  ciBaseObject(): _ident(0) {}
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  virtual const char* type_string() { return "ciBaseObject"; }
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  void set_ident(uint id);
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public:
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  // A number unique to this object.
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  uint ident();
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  // What kind of ciBaseObject is this?
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  virtual bool is_symbol() const       { return false; }
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  virtual bool is_object() const       { return false; }
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  virtual bool is_metadata() const     { return false; }
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  ciSymbol* as_symbol() {
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    assert(is_symbol(), "must be");
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    return (ciSymbol*)this;
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  }
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  ciObject* as_object() {
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    assert(is_object(), "must be");
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    return (ciObject*)this;
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  }
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  ciMetadata* as_metadata() {
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    assert(is_metadata(), "must be");
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    return (ciMetadata*)this;
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  }
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};
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#endif // SHARE_VM_CI_CIBASEOBJECT_HPP