Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/liveRange.hpp @ 1941:79d04223b8a5
Added caching for resolved types and resolved fields.
This is crucial, because the local load elimination will lead to wrong results, if field equality (of two RiField objects with the same object and the same RiType) is not given. The caching makes sure that the default equals implementation is sufficient.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Tue, 28 Dec 2010 18:33:26 +0100 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved. |
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| 5 * This code is free software; you can redistribute it and/or modify it | |
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| 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). | |
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| 15 * You should have received a copy of the GNU General Public License version | |
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| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // This is a shared helper class used during phase 3 and 4 to move all the objects | |
| 26 // Dead regions in a Space are linked together to keep track of the live regions | |
| 27 // so that the live data can be traversed quickly without having to look at each | |
| 28 // object. | |
| 29 | |
| 30 class LiveRange: public MemRegion { | |
| 31 public: | |
| 32 LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {} | |
| 33 | |
| 34 void set_end(HeapWord* e) { | |
| 35 assert(e >= start(), "should be a non-zero range"); | |
| 36 MemRegion::set_end(e); | |
| 37 } | |
| 38 void set_word_size(size_t ws) { | |
| 39 assert(ws >= 0, "should be a non-zero range"); | |
| 40 MemRegion::set_word_size(ws); | |
| 41 } | |
| 42 | |
| 43 LiveRange * next() { return (LiveRange *) end(); } | |
| 44 | |
| 45 void move_to(HeapWord* destination) { | |
| 46 Copy::aligned_conjoint_words(start(), destination, word_size()); | |
| 47 } | |
| 48 }; |