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annotate src/share/vm/memory/barrierSet.inline.hpp @ 12146:9758d9f36299

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8021954: VM SIGSEGV during classloading on MacOS; hs_err_pid file produced Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung Contributed-by: lois.foltan@oracle.com
author coleenp
date Thu, 29 Aug 2013 18:56:29 -0400
parents f95d63e2154a
children 3205e78d8193
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1 /*
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2 * Copyright (c) 2001, 2010, 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 #ifndef SHARE_VM_MEMORY_BARRIERSET_INLINE_HPP
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26 #define SHARE_VM_MEMORY_BARRIERSET_INLINE_HPP
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27
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28 #include "memory/barrierSet.hpp"
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29 #include "memory/cardTableModRefBS.hpp"
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30
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31 // Inline functions of BarrierSet, which de-virtualize certain
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32 // performance-critical calls when the barrier is the most common
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33 // card-table kind.
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34
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35 template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) {
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36 if (kind() == CardTableModRef) {
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37 ((CardTableModRefBS*)this)->inline_write_ref_field_pre(field, new_val);
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38 } else {
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39 write_ref_field_pre_work(field, new_val);
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40 }
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41 }
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42
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43 void BarrierSet::write_ref_field(void* field, oop new_val) {
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44 if (kind() == CardTableModRef) {
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45 ((CardTableModRefBS*)this)->inline_write_ref_field(field, new_val);
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46 } else {
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47 write_ref_field_work(field, new_val);
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48 }
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49 }
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50
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51 // count is number of array elements being written
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52 void BarrierSet::write_ref_array(HeapWord* start, size_t count) {
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53 assert(count <= (size_t)max_intx, "count too large");
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54 HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));
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55 // In the case of compressed oops, start and end may potentially be misaligned;
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56 // so we need to conservatively align the first downward (this is not
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57 // strictly necessary for current uses, but a case of good hygiene and,
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58 // if you will, aesthetics) and the second upward (this is essential for
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59 // current uses) to a HeapWord boundary, so we mark all cards overlapping
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60 // this write. If this evolves in the future to calling a
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61 // logging barrier of narrow oop granularity, like the pre-barrier for G1
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62 // (mentioned here merely by way of example), we will need to change this
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63 // interface, so it is "exactly precise" (if i may be allowed the adverbial
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64 // redundancy for emphasis) and does not include narrow oop slots not
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65 // included in the original write interval.
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66 HeapWord* aligned_start = (HeapWord*)align_size_down((uintptr_t)start, HeapWordSize);
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67 HeapWord* aligned_end = (HeapWord*)align_size_up ((uintptr_t)end, HeapWordSize);
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68 // If compressed oops were not being used, these should already be aligned
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69 assert(UseCompressedOops || (aligned_start == start && aligned_end == end),
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70 "Expected heap word alignment of start and end");
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71 #if 0
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72 warning("Post:\t" INTPTR_FORMAT "[" SIZE_FORMAT "] : [" INTPTR_FORMAT","INTPTR_FORMAT")\t",
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73 start, count, aligned_start, aligned_end);
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74 #endif
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75 write_ref_array_work(MemRegion(aligned_start, aligned_end));
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76 }
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78
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79 void BarrierSet::write_region(MemRegion mr) {
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80 if (kind() == CardTableModRef) {
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81 ((CardTableModRefBS*)this)->inline_write_region(mr);
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82 } else {
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83 write_region_work(mr);
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84 }
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85 }
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86
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87 #endif // SHARE_VM_MEMORY_BARRIERSET_INLINE_HPP