Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.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 | d1605aabd0a1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2002-2006 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 | |
| 25 inline void PSScavenge::save_to_space_top_before_gc() { | |
| 26 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 27 _to_space_top_before_gc = heap->young_gen()->to_space()->top(); | |
| 28 } | |
| 29 | |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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30 template <class T> inline bool PSScavenge::should_scavenge(T* p) { |
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31 T heap_oop = oopDesc::load_heap_oop(p); |
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32 if (oopDesc::is_null(heap_oop)) return false; |
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33 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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34 return PSScavenge::is_obj_in_young((HeapWord*)obj); |
| 0 | 35 } |
| 36 | |
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37 template <class T> |
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38 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) { |
| 0 | 39 if (should_scavenge(p)) { |
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40 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 41 // Skip objects copied to to_space since the scavenge started. |
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42 HeapWord* const addr = (HeapWord*)obj; |
| 0 | 43 return addr < to_space_top_before_gc() || addr >= to_space->end(); |
| 44 } | |
| 45 return false; | |
| 46 } | |
| 47 | |
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48 template <class T> |
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49 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) { |
| 0 | 50 if (check_to_space) { |
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51 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
| 0 | 52 return should_scavenge(p, heap->young_gen()->to_space()); |
| 53 } | |
| 54 return should_scavenge(p); | |
| 55 } | |
| 56 | |
| 57 // Attempt to "claim" oop at p via CAS, push the new obj if successful | |
| 58 // This version tests the oop* to make sure it is within the heap before | |
| 59 // attempting marking. | |
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60 template <class T> |
| 0 | 61 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm, |
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62 T* p) { |
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63 assert(should_scavenge(p, true), "revisiting object?"); |
| 0 | 64 |
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65 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
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66 oop new_obj = o->is_forwarded() |
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67 ? o->forwardee() |
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68 : pm->copy_to_survivor_space(o, pm->depth_first()); |
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69 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 70 |
| 71 // We cannot mark without test, as some code passes us pointers | |
| 72 // that are outside the heap. | |
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73 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && |
| 0 | 74 Universe::heap()->is_in_reserved(p)) { |
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75 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { |
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76 card_table()->inline_write_ref_field_gc(p, new_obj); |
| 0 | 77 } |
| 78 } | |
| 79 } |