1 #ifdef USE_PRAGMA_IDENT_HDR
2 #pragma ident "@(#)psScavenge.inline.hpp 1.18 07/05/05 17:05:29 JVM"
3 #endif
4 /*
5 * Copyright 2002-2006 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28
29 inline void PSScavenge::save_to_space_top_before_gc() {
30 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
31 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
32 }
33
34 inline bool PSScavenge::should_scavenge(oop p) {
35 return p == NULL ? false : PSScavenge::is_obj_in_young((HeapWord*) p);
36 }
37
38 inline bool PSScavenge::should_scavenge(oop p, MutableSpace* to_space) {
39 if (should_scavenge(p)) {
40 // Skip objects copied to to_space since the scavenge started.
41 HeapWord* const addr = (HeapWord*) p;
42 return addr < to_space_top_before_gc() || addr >= to_space->end();
43 }
44 return false;
45 }
46
47 inline bool PSScavenge::should_scavenge(oop p, bool check_to_space) {
48 if (check_to_space) {
49 ParallelScavengeHeap* heap = (ParallelScavengeHeap*) Universe::heap();
50 return should_scavenge(p, heap->young_gen()->to_space());
51 }
52 return should_scavenge(p);
53 }
54
55 // Attempt to "claim" oop at p via CAS, push the new obj if successful
56 // This version tests the oop* to make sure it is within the heap before
57 // attempting marking.
58 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
59 oop* p) {
60 assert(should_scavenge(*p, true), "revisiting object?");
61
62 oop o = *p;
63 if (o->is_forwarded()) {
64 *p = o->forwardee();
65 } else {
66 *p = pm->copy_to_survivor_space(o, pm->depth_first());
67 }
68
69 // We cannot mark without test, as some code passes us pointers
70 // that are outside the heap.
71 if ((!PSScavenge::is_obj_in_young((HeapWord*) p)) &&
72 Universe::heap()->is_in_reserved(p)) {
73 o = *p;
74 if (PSScavenge::is_obj_in_young((HeapWord*) o)) {
75 card_table()->inline_write_ref_field_gc(p, o);
76 }
77 }
78 }
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1 #ifdef USE_PRAGMA_IDENT_HDR
2 #pragma ident "@(#)psScavenge.inline.hpp 1.18 07/05/05 17:05:29 JVM"
3 #endif
4 /*
5 * Copyright 2002-2008 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 inline void PSScavenge::save_to_space_top_before_gc() {
29 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
30 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
31 }
32
33 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
34 T heap_oop = oopDesc::load_heap_oop(p);
35 if (oopDesc::is_null(heap_oop)) return false;
36 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
37 return PSScavenge::is_obj_in_young((HeapWord*)obj);
38 }
39
40 template <class T>
41 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
42 if (should_scavenge(p)) {
43 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
44 // Skip objects copied to to_space since the scavenge started.
45 HeapWord* const addr = (HeapWord*)obj;
46 return addr < to_space_top_before_gc() || addr >= to_space->end();
47 }
48 return false;
49 }
50
51 template <class T>
52 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
53 if (check_to_space) {
54 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
55 return should_scavenge(p, heap->young_gen()->to_space());
56 }
57 return should_scavenge(p);
58 }
59
60 // Attempt to "claim" oop at p via CAS, push the new obj if successful
61 // This version tests the oop* to make sure it is within the heap before
62 // attempting marking.
63 template <class T>
64 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
65 T* p) {
66 assert(should_scavenge(p, true), "revisiting object?");
67
68 oop o = oopDesc::load_decode_heap_oop_not_null(p);
69 oop new_obj = o->is_forwarded()
70 ? o->forwardee()
71 : pm->copy_to_survivor_space(o, pm->depth_first());
72 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
73
74 // We cannot mark without test, as some code passes us pointers
75 // that are outside the heap.
76 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
77 Universe::heap()->is_in_reserved(p)) {
78 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
79 card_table()->inline_write_ref_field_gc(p, new_obj);
80 }
81 }
82 }
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