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comparison src/share/vm/oops/metadata.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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children cd6b3f1a94ff
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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_OOPS_METADATA_HPP
26 #define SHARE_VM_OOPS_METADATA_HPP
27
28 #include "utilities/exceptions.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/ostream.hpp"
31
32 // This is the base class for an internal Class related metadata
33 class Metadata : public MetaspaceObj {
34 // Debugging hook to check that the metadata has not been deleted.
35 NOT_PRODUCT(int _valid;)
36 public:
37 NOT_PRODUCT(Metadata() { _valid = 0; })
38 NOT_PRODUCT(bool is_valid() const volatile { return _valid == 0; })
39
40 int identity_hash() { return (int)(uintptr_t)this; }
41
42 // Rehashing support for tables containing pointers to this
43 unsigned int new_hash(jint seed) { ShouldNotReachHere(); return 0; }
44
45 virtual bool is_klass() const volatile { return false; }
46 virtual bool is_method() const volatile { return false; }
47 virtual bool is_methodData() const volatile { return false; }
48 virtual bool is_constantPool() const volatile { return false; }
49
50 virtual const char* internal_name() const = 0;
51
52 void print() const { print_on(tty); }
53 void print_value() const { print_value_on(tty); }
54
55 void print_maybe_null() const { print_on_maybe_null(tty); }
56 void print_on_maybe_null(outputStream* st) const {
57 if (this == NULL)
58 st->print("NULL");
59 else
60 print_on(tty);
61 }
62 void print_value_on_maybe_null(outputStream* st) const {
63 if (this == NULL)
64 st->print("NULL");
65 else
66 print_value_on(tty);
67 }
68
69 virtual void print_on(outputStream* st) const; // First level print
70 virtual void print_value_on(outputStream* st) const = 0; // Second level print
71
72 char* print_value_string() const;
73
74 // Used to keep metadata alive during class redefinition
75 // Can't assert because is called for delete functions (as an assert)
76 virtual bool on_stack() const { return false; }
77 virtual void set_on_stack(const bool value);
78
79 // Set on_stack bit, so that the metadata is not cleared
80 // during class redefinition. This is a virtual call because only methods
81 // and constant pools need to be set, but someday instanceKlasses might also.
82 static void mark_on_stack(Metadata* m) { m->set_on_stack(true); }
83 };
84
85 #endif // SHARE_VM_OOPS_METADATA_HPP