comparison src/share/vm/oops/compiledICHolder.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
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/share/vm/oops/compiledICHolderOop.hpp@f95d63e2154a
children
comparison
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6724:36d1d483d5d6 6725:da91efe96a93
1 /*
2 * Copyright (c) 1998, 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_COMPILEDICHOLDEROOP_HPP
26 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
27
28 #include "oops/oop.hpp"
29
30 // A CompiledICHolder* is a helper object for the inline cache implementation.
31 // It holds an intermediate value (method+klass pair) used when converting from
32 // compiled to an interpreted call.
33 //
34 // These are always allocated in the C heap and are freed during a
35 // safepoint by the ICBuffer logic. It's unsafe to free them earlier
36 // since they might be in use.
37 //
38
39
40 class CompiledICHolder : public CHeapObj<mtCompiler> {
41 friend class VMStructs;
42 private:
43 static volatile int _live_count; // allocated
44 static volatile int _live_not_claimed_count; // allocated but not yet in use so not
45 // reachable by iterating over nmethods
46
47 Method* _holder_method;
48 Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass
49 CompiledICHolder* _next;
50
51 public:
52 // Constructor
53 CompiledICHolder(Method* method, Klass* klass)
54 : _holder_method(method), _holder_klass(klass) {
55 #ifdef ASSERT
56 Atomic::inc(&_live_count);
57 Atomic::inc(&_live_not_claimed_count);
58 #endif
59 }
60
61 ~CompiledICHolder() {
62 #ifdef ASSERT
63 assert(_live_count > 0, "underflow");
64 Atomic::dec(&_live_count);
65 #endif
66 }
67
68 static int live_count() { return _live_count; }
69 static int live_not_claimed_count() { return _live_not_claimed_count; }
70
71 // accessors
72 Method* holder_method() const { return _holder_method; }
73 Klass* holder_klass() const { return _holder_klass; }
74
75 void set_holder_method(Method* m) { _holder_method = m; }
76 void set_holder_klass(Klass* k) { _holder_klass = k; }
77
78 // interpreter support (offsets in bytes)
79 static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); }
80 static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); }
81
82 CompiledICHolder* next() { return _next; }
83 void set_next(CompiledICHolder* n) { _next = n; }
84
85 // Verify
86 void verify_on(outputStream* st);
87
88 // Printing
89 void print_on(outputStream* st) const;
90 void print_value_on(outputStream* st) const;
91
92 const char* internal_name() const { return "{compiledICHolder}"; }
93
94 void claim() {
95 #ifdef ASSERT
96 Atomic::dec(&_live_not_claimed_count);
97 #endif
98 }
99 };
100
101 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP