Mercurial > hg > truffle
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 |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | src/share/vm/oops/compiledICHolderOop.hpp@f95d63e2154a |
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6724:36d1d483d5d6 | 6725:da91efe96a93 |
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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 |