Sat, 01 Dec 2007 00:00:00 +0000
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duke@435 | 1 | /* |
duke@435 | 2 | * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | inline void ParScanWeakRefClosure::do_oop(oop* p) |
duke@435 | 26 | { |
duke@435 | 27 | oop obj = *p; |
duke@435 | 28 | assert (obj != NULL, "null weak reference?"); |
duke@435 | 29 | // weak references are sometimes scanned twice; must check |
duke@435 | 30 | // that to-space doesn't already contain this object |
duke@435 | 31 | if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { |
duke@435 | 32 | // we need to ensure that it is copied (see comment in |
duke@435 | 33 | // ParScanClosure::do_oop_work). |
duke@435 | 34 | klassOop objK = obj->klass(); |
duke@435 | 35 | markOop m = obj->mark(); |
duke@435 | 36 | if (m->is_marked()) { // Contains forwarding pointer. |
duke@435 | 37 | *p = ParNewGeneration::real_forwardee(obj); |
duke@435 | 38 | } else { |
duke@435 | 39 | size_t obj_sz = obj->size_given_klass(objK->klass_part()); |
duke@435 | 40 | *p = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state, |
duke@435 | 41 | obj, obj_sz, m); |
duke@435 | 42 | } |
duke@435 | 43 | } |
duke@435 | 44 | } |
duke@435 | 45 | |
duke@435 | 46 | inline void ParScanWeakRefClosure::do_oop_nv(oop* p) |
duke@435 | 47 | { |
duke@435 | 48 | ParScanWeakRefClosure::do_oop(p); |
duke@435 | 49 | } |
duke@435 | 50 | |
duke@435 | 51 | inline void ParScanClosure::par_do_barrier(oop* p) { |
duke@435 | 52 | assert(generation()->is_in_reserved(p), "expected ref in generation"); |
duke@435 | 53 | oop obj = *p; |
duke@435 | 54 | assert(obj != NULL, "expected non-null object"); |
duke@435 | 55 | // If p points to a younger generation, mark the card. |
duke@435 | 56 | if ((HeapWord*)obj < gen_boundary()) { |
duke@435 | 57 | rs()->write_ref_field_gc_par(p, obj); |
duke@435 | 58 | } |
duke@435 | 59 | } |
duke@435 | 60 | |
duke@435 | 61 | inline void ParScanClosure::do_oop_work(oop* p, |
duke@435 | 62 | bool gc_barrier, |
duke@435 | 63 | bool root_scan) { |
duke@435 | 64 | oop obj = *p; |
duke@435 | 65 | assert((!Universe::heap()->is_in_reserved(p) || |
duke@435 | 66 | generation()->is_in_reserved(p)) |
duke@435 | 67 | && (generation()->level() == 0 || gc_barrier), |
duke@435 | 68 | "The gen must be right, and we must be doing the barrier " |
duke@435 | 69 | "in older generations."); |
duke@435 | 70 | if (obj != NULL) { |
duke@435 | 71 | if ((HeapWord*)obj < _boundary) { |
duke@435 | 72 | assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); |
duke@435 | 73 | // OK, we need to ensure that it is copied. |
duke@435 | 74 | // We read the klass and mark in this order, so that we can reliably |
duke@435 | 75 | // get the size of the object: if the mark we read is not a |
duke@435 | 76 | // forwarding pointer, then the klass is valid: the klass is only |
duke@435 | 77 | // overwritten with an overflow next pointer after the object is |
duke@435 | 78 | // forwarded. |
duke@435 | 79 | klassOop objK = obj->klass(); |
duke@435 | 80 | markOop m = obj->mark(); |
duke@435 | 81 | if (m->is_marked()) { // Contains forwarding pointer. |
duke@435 | 82 | *p = ParNewGeneration::real_forwardee(obj); |
duke@435 | 83 | } else { |
duke@435 | 84 | size_t obj_sz = obj->size_given_klass(objK->klass_part()); |
duke@435 | 85 | *p = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m); |
duke@435 | 86 | if (root_scan) { |
duke@435 | 87 | // This may have pushed an object. If we have a root |
duke@435 | 88 | // category with a lot of roots, can't let the queue get too |
duke@435 | 89 | // full: |
duke@435 | 90 | (void)_par_scan_state->trim_queues(10 * ParallelGCThreads); |
duke@435 | 91 | } |
duke@435 | 92 | } |
duke@435 | 93 | if (gc_barrier) { |
duke@435 | 94 | // Now call parent closure |
duke@435 | 95 | par_do_barrier(p); |
duke@435 | 96 | } |
duke@435 | 97 | } |
duke@435 | 98 | } |
duke@435 | 99 | } |