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annotate src/share/vm/memory/barrierSet.inline.hpp @ 1552:c18cbe5936b8

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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
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date Thu, 27 May 2010 19:08:38 -0700
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1 /*
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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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.
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22 *
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23 */
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24
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25 // Inline functions of BarrierSet, which de-virtualize certain
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26 // performance-critical calls when the barrier is the most common
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27 // card-table kind.
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28
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29 template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) {
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30 if (kind() == CardTableModRef) {
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31 ((CardTableModRefBS*)this)->inline_write_ref_field_pre(field, new_val);
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32 } else {
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33 write_ref_field_pre_work(field, new_val);
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34 }
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35 }
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36
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37 void BarrierSet::write_ref_field(void* field, oop new_val) {
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38 if (kind() == CardTableModRef) {
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39 ((CardTableModRefBS*)this)->inline_write_ref_field(field, new_val);
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40 } else {
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41 write_ref_field_work(field, new_val);
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42 }
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43 }
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44
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45 // count is number of array elements being written
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46 void BarrierSet::write_ref_array(HeapWord* start, size_t count) {
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47 assert(count <= (size_t)max_intx, "count too large");
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48 HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));
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49 // In the case of compressed oops, start and end may potentially be misaligned;
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50 // so we need to conservatively align the first downward (this is not
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51 // strictly necessary for current uses, but a case of good hygiene and,
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52 // if you will, aesthetics) and the second upward (this is essential for
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53 // current uses) to a HeapWord boundary, so we mark all cards overlapping
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54 // this write. If this evolves in the future to calling a
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55 // logging barrier of narrow oop granularity, like the pre-barrier for G1
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56 // (mentioned here merely by way of example), we will need to change this
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57 // interface, so it is "exactly precise" (if i may be allowed the adverbial
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58 // redundancy for emphasis) and does not include narrow oop slots not
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59 // included in the original write interval.
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60 HeapWord* aligned_start = (HeapWord*)align_size_down((uintptr_t)start, HeapWordSize);
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61 HeapWord* aligned_end = (HeapWord*)align_size_up ((uintptr_t)end, HeapWordSize);
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62 // If compressed oops were not being used, these should already be aligned
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63 assert(UseCompressedOops || (aligned_start == start && aligned_end == end),
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64 "Expected heap word alignment of start and end");
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65 #if 0
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66 warning("Post:\t" INTPTR_FORMAT "[" SIZE_FORMAT "] : [" INTPTR_FORMAT","INTPTR_FORMAT")\t",
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67 start, count, aligned_start, aligned_end);
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68 #endif
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69 write_ref_array_work(MemRegion(aligned_start, aligned_end));
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70 }
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73 void BarrierSet::write_region(MemRegion mr) {
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74 if (kind() == CardTableModRef) {
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75 ((CardTableModRefBS*)this)->inline_write_region(mr);
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76 } else {
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77 write_region_work(mr);
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78 }
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79 }