Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parOopClosures.inline.hpp @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
| author | coleenp |
|---|---|
| date | Sun, 13 Apr 2008 17:43:42 -0400 |
| parents | a61af66fc99e |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright (c) 2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
|
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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25 template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) { |
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26 assert (!oopDesc::is_null(*p), "null weak reference?"); |
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27 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 28 // weak references are sometimes scanned twice; must check |
| 29 // that to-space doesn't already contain this object | |
| 30 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { | |
| 31 // we need to ensure that it is copied (see comment in | |
| 32 // ParScanClosure::do_oop_work). | |
| 33 klassOop objK = obj->klass(); | |
| 34 markOop m = obj->mark(); | |
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35 oop new_obj; |
| 0 | 36 if (m->is_marked()) { // Contains forwarding pointer. |
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37 new_obj = ParNewGeneration::real_forwardee(obj); |
| 0 | 38 } else { |
| 39 size_t obj_sz = obj->size_given_klass(objK->klass_part()); | |
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40 new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state, |
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41 obj, obj_sz, m); |
| 0 | 42 } |
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43 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 44 } |
| 45 } | |
| 46 | |
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47 inline void ParScanWeakRefClosure::do_oop_nv(oop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
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48 inline void ParScanWeakRefClosure::do_oop_nv(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
| 0 | 49 |
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50 template <class T> inline void ParScanClosure::par_do_barrier(T* p) { |
| 0 | 51 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
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52 assert(!oopDesc::is_null(*p), "expected non-null object"); |
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53 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 54 // If p points to a younger generation, mark the card. |
| 55 if ((HeapWord*)obj < gen_boundary()) { | |
| 56 rs()->write_ref_field_gc_par(p, obj); | |
| 57 } | |
| 58 } | |
| 59 | |
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60 template <class T> |
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61 inline void ParScanClosure::do_oop_work(T* p, |
| 0 | 62 bool gc_barrier, |
| 63 bool root_scan) { | |
| 64 assert((!Universe::heap()->is_in_reserved(p) || | |
| 65 generation()->is_in_reserved(p)) | |
| 66 && (generation()->level() == 0 || gc_barrier), | |
| 67 "The gen must be right, and we must be doing the barrier " | |
| 68 "in older generations."); | |
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69 T heap_oop = oopDesc::load_heap_oop(p); |
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70 if (!oopDesc::is_null(heap_oop)) { |
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71 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 0 | 72 if ((HeapWord*)obj < _boundary) { |
| 73 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
| 74 // OK, we need to ensure that it is copied. | |
| 75 // We read the klass and mark in this order, so that we can reliably | |
| 76 // get the size of the object: if the mark we read is not a | |
| 77 // forwarding pointer, then the klass is valid: the klass is only | |
| 78 // overwritten with an overflow next pointer after the object is | |
| 79 // forwarded. | |
| 80 klassOop objK = obj->klass(); | |
| 81 markOop m = obj->mark(); | |
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82 oop new_obj; |
| 0 | 83 if (m->is_marked()) { // Contains forwarding pointer. |
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84 new_obj = ParNewGeneration::real_forwardee(obj); |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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85 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 86 } else { |
| 87 size_t obj_sz = obj->size_given_klass(objK->klass_part()); | |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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88 new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m); |
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ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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89 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 90 if (root_scan) { |
| 91 // This may have pushed an object. If we have a root | |
| 92 // category with a lot of roots, can't let the queue get too | |
| 93 // full: | |
| 94 (void)_par_scan_state->trim_queues(10 * ParallelGCThreads); | |
| 95 } | |
| 96 } | |
| 97 if (gc_barrier) { | |
| 98 // Now call parent closure | |
| 99 par_do_barrier(p); | |
| 100 } | |
| 101 } | |
| 102 } | |
| 103 } | |
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104 |
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105 inline void ParScanWithBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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106 inline void ParScanWithBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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107 |
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108 inline void ParScanWithoutBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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109 inline void ParScanWithoutBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); } |