Mercurial > hg > truffle
annotate src/share/vm/memory/defNewGeneration.inline.hpp @ 362:f8199438385b
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author | apetrusenko |
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date | Wed, 17 Sep 2008 16:49:18 +0400 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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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25 // Methods of protected closure types |
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26 |
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27 template <class T> |
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28 inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) { |
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29 #ifdef ASSERT |
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30 { |
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31 // We never expect to see a null reference being processed |
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32 // as a weak reference. |
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33 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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34 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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35 assert (obj->is_oop(), "expected an oop while scanning weak refs"); |
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36 } |
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37 #endif // ASSERT |
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38 |
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39 _cl->do_oop_nv(p); |
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40 |
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41 // Card marking is trickier for weak refs. |
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42 // This oop is a 'next' field which was filled in while we |
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43 // were discovering weak references. While we might not need |
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44 // to take a special action to keep this reference alive, we |
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45 // will need to dirty a card as the field was modified. |
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46 // |
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47 // Alternatively, we could create a method which iterates through |
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48 // each generation, allowing them in turn to examine the modified |
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49 // field. |
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50 // |
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51 // We could check that p is also in an older generation, but |
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52 // dirty cards in the youngest gen are never scanned, so the |
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53 // extra check probably isn't worthwhile. |
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54 if (Universe::heap()->is_in_reserved(p)) { |
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55 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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56 _rs->inline_write_ref_field_gc(p, obj); |
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57 } |
0 | 58 } |
59 | |
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60 template <class T> |
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61 inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) { |
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62 #ifdef ASSERT |
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63 { |
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64 // We never expect to see a null reference being processed |
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65 // as a weak reference. |
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66 assert (!oopDesc::is_null(*p), "expected non-null ref"); |
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67 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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68 assert (obj->is_oop(), "expected an oop while scanning weak refs"); |
0 | 69 } |
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70 #endif // ASSERT |
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71 |
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72 _cl->do_oop_nv(p); |
0 | 73 |
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74 // Optimized for Defnew generation if it's the youngest generation: |
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75 // we set a younger_gen card if we have an older->youngest |
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76 // generation pointer. |
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77 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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78 if (((HeapWord*)obj < _boundary) && Universe::heap()->is_in_reserved(p)) { |
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79 _rs->inline_write_ref_field_gc(p, obj); |
0 | 80 } |
81 } |