1 /*
2 * Copyright (c) 1997, 2009, 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 // The following classes are C++ `closures` for iterating over objects, roots and spaces
26
27 class CodeBlob;
28 class nmethod;
29 class ReferenceProcessor;
30 class DataLayout;
31
32 // Closure provides abortability.
33
34 class Closure : public StackObj {
35 protected:
36 bool _abort;
37 void set_abort() { _abort = true; }
38 public:
39 Closure() : _abort(false) {}
40 // A subtype can use this mechanism to indicate to some iterator mapping
41 // functions that the iteration should cease.
42 bool abort() { return _abort; }
43 void clear_abort() { _abort = false; }
44 };
308 // the current collection is an explicit collection. Turning
309 // on the checking in general for
310 // ExplicitGCInvokesConcurrentAndUnloadsClasses and
311 // UseConcMarkSweepGC should not lead to false positives.
312 _do_check =
313 ClassUnloading && !UseConcMarkSweepGC ||
314 CMSClassUnloadingEnabled && UseConcMarkSweepGC ||
315 ExplicitGCInvokesConcurrentAndUnloadsClasses && UseConcMarkSweepGC;
316 if (_do_check) {
317 _saved_state = OopClosure::must_remember_klasses();
318 OopClosure::set_must_remember_klasses(checking_on);
319 }
320 }
321 ~RememberKlassesChecker() {
322 if (_do_check) {
323 OopClosure::set_must_remember_klasses(_saved_state);
324 }
325 }
326 };
327 #endif // ASSERT
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1 /*
2 * Copyright (c) 1997, 2010, 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_MEMORY_ITERATOR_HPP
26 #define SHARE_VM_MEMORY_ITERATOR_HPP
27
28 #include "memory/allocation.hpp"
29 #include "memory/memRegion.hpp"
30 #include "runtime/prefetch.hpp"
31 #include "utilities/top.hpp"
32
33 // The following classes are C++ `closures` for iterating over objects, roots and spaces
34
35 class CodeBlob;
36 class nmethod;
37 class ReferenceProcessor;
38 class DataLayout;
39
40 // Closure provides abortability.
41
42 class Closure : public StackObj {
43 protected:
44 bool _abort;
45 void set_abort() { _abort = true; }
46 public:
47 Closure() : _abort(false) {}
48 // A subtype can use this mechanism to indicate to some iterator mapping
49 // functions that the iteration should cease.
50 bool abort() { return _abort; }
51 void clear_abort() { _abort = false; }
52 };
316 // the current collection is an explicit collection. Turning
317 // on the checking in general for
318 // ExplicitGCInvokesConcurrentAndUnloadsClasses and
319 // UseConcMarkSweepGC should not lead to false positives.
320 _do_check =
321 ClassUnloading && !UseConcMarkSweepGC ||
322 CMSClassUnloadingEnabled && UseConcMarkSweepGC ||
323 ExplicitGCInvokesConcurrentAndUnloadsClasses && UseConcMarkSweepGC;
324 if (_do_check) {
325 _saved_state = OopClosure::must_remember_klasses();
326 OopClosure::set_must_remember_klasses(checking_on);
327 }
328 }
329 ~RememberKlassesChecker() {
330 if (_do_check) {
331 OopClosure::set_must_remember_klasses(_saved_state);
332 }
333 }
334 };
335 #endif // ASSERT
336
337 #endif // SHARE_VM_MEMORY_ITERATOR_HPP
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