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comparison src/share/vm/classfile/metadataOnStackMark.cpp @ 7949:5daaddd917a1

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8006040: NPG: on_stack processing wastes space in ConstantPool Summary: Added on_stack bit to flags. Also MetadataMarkOnStack is used for more than JVMTI so had to be moved. Reviewed-by: dholmes, stefank
author coleenp
date Wed, 23 Jan 2013 10:34:29 -0500
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children 910026b800b8
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7632:2ef7061f13b4 7949:5daaddd917a1
1 /*
2 * Copyright (c) 2013, 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 #include "precompiled.hpp"
26 #include "classfile/metadataOnStackMark.hpp"
27 #include "code/codeCache.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "oops/metadata.hpp"
30 #include "runtime/synchronizer.hpp"
31 #include "runtime/thread.hpp"
32 #include "utilities/growableArray.hpp"
33
34
35 // Keep track of marked on-stack metadata so it can be cleared.
36 GrowableArray<Metadata*>* _marked_objects = NULL;
37 NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
38
39 // Walk metadata on the stack and mark it so that redefinition doesn't delete
40 // it. Class unloading also walks the previous versions and might try to
41 // delete it, so this class is used by class unloading also.
42 MetadataOnStackMark::MetadataOnStackMark() {
43 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
44 NOT_PRODUCT(_is_active = true;)
45 if (_marked_objects == NULL) {
46 _marked_objects = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(1000, true);
47 }
48 Threads::metadata_do(Metadata::mark_on_stack);
49 CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
50 CompileBroker::mark_on_stack();
51 }
52
53 MetadataOnStackMark::~MetadataOnStackMark() {
54 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
55 // Unmark everything that was marked. Can't do the same walk because
56 // redefine classes messes up the code cache so the set of methods
57 // might not be the same.
58 for (int i = 0; i< _marked_objects->length(); i++) {
59 _marked_objects->at(i)->set_on_stack(false);
60 }
61 _marked_objects->clear(); // reuse growable array for next time.
62 NOT_PRODUCT(_is_active = false;)
63 }
64
65 // Record which objects are marked so we can unmark the same objects.
66 void MetadataOnStackMark::record(Metadata* m) {
67 assert(_is_active, "metadata on stack marking is active");
68 _marked_objects->push(m);
69 }