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comparison src/share/vm/ci/ciBaseObject.hpp @ 6725:da91efe96a93

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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>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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6724:36d1d483d5d6 6725:da91efe96a93
1 /*
2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CI_CIBASEOBJECT_HPP
26 #define SHARE_VM_CI_CIBASEOBJECT_HPP
27
28 #include "ci/ciClassList.hpp"
29 #include "memory/allocation.hpp"
30 #include "runtime/handles.hpp"
31 #include "runtime/jniHandles.hpp"
32
33 // ciBaseObject
34 //
35 // This class represents an oop in the HotSpot virtual machine.
36 // Its subclasses are structured in a hierarchy which mirrors
37 // an aggregate of the VM's oop and klass hierarchies (see
38 // oopHierarchy.hpp). Each instance of ciBaseObject holds a handle
39 // to a corresponding oop on the VM side and provides routines
40 // for accessing the information in its oop. By using the ciBaseObject
41 // hierarchy for accessing oops in the VM, the compiler ensures
42 // that it is safe with respect to garbage collection; that is,
43 // GC and compilation can proceed independently without
44 // interference.
45 //
46 // Within the VM, the oop and klass hierarchies are separate.
47 // The compiler interface does not preserve this separation --
48 // the distinction between `Klass*' and `Klass' are not
49 // reflected in the interface and instead the Klass hierarchy
50 // is directly modeled as the subclasses of ciKlass.
51 class ciBaseObject : public ResourceObj {
52 CI_PACKAGE_ACCESS
53 friend class ciEnv;
54
55 protected:
56 uint _ident;
57
58 enum { FLAG_BITS = 1 };
59 enum {
60 SCAVENGABLE_FLAG = 1
61 };
62 protected:
63 ciBaseObject(): _ident(0) {}
64
65 virtual const char* type_string() { return "ciBaseObject"; }
66
67 void set_ident(uint id);
68
69 public:
70 // A number unique to this object.
71 uint ident();
72
73 // What kind of ciBaseObject is this?
74 virtual bool is_symbol() const { return false; }
75 virtual bool is_object() const { return false; }
76 virtual bool is_metadata() const { return false; }
77
78 ciSymbol* as_symbol() {
79 assert(is_symbol(), "must be");
80 return (ciSymbol*)this;
81 }
82 ciObject* as_object() {
83 assert(is_object(), "must be");
84 return (ciObject*)this;
85 }
86 ciMetadata* as_metadata() {
87 assert(is_metadata(), "must be");
88 return (ciMetadata*)this;
89 }
90 };
91 #endif // SHARE_VM_CI_CIBASEOBJECT_HPP