Mercurial > hg > truffle
comparison src/share/vm/ci/ciBaseObject.hpp @ 6725:da91efe96a93
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 |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
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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 |