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annotate src/share/vm/memory/barrierSet.inline.hpp @ 1721:413ad0331a0c

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6977924: Changes for 6975078 produce build error with certain gcc versions Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error. Reviewed-by: jcoomes, ysr, phh
author johnc
date Wed, 18 Aug 2010 10:59:06 -0700
parents c18cbe5936b8
children f95d63e2154a
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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 }