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annotate src/share/vm/memory/metachunk.cpp @ 12301:2c022e432e10

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8024974: Incorrect use of GC_locker::is_active() Summary: SymbolTable and StringTable can make calls to GC_locker::is_active() outside a safepoint. This isn't safe because the GC_locker active state (lock count) is only updated at a safepoint and only remains valid as long as _needs_gc is true. However, outside a safepoint_needs_gc can change to false at any time, which makes it impossible to do a correct call to is_active() in that context. In this case these calls can just be removed since the input argument to basic_add() should never be on the heap and so there's no need to check the GC_locker state. This change also adjusts the assert() in is_active() to makes sure all calls to this function are always done under a safepoint. Reviewed-by: brutisso, dcubed Contributed-by: per.liden@oracle.com
author stefank
date Fri, 20 Sep 2013 10:53:28 +0200
parents c23dbf0e8ab7
children bdfbb1fb19ca
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1 /*
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2 * Copyright (c) 2012, 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 #include "precompiled.hpp"
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26 #include "memory/allocation.hpp"
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27 #include "memory/metachunk.hpp"
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28 #include "utilities/copy.hpp"
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29 #include "utilities/debug.hpp"
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30
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31 class VirtualSpaceNode;
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32 //
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33 // Future modification
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34 //
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35 // The Metachunk can conceivable be replaced by the Chunk in
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36 // allocation.hpp. Note that the latter Chunk is the space for
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37 // allocation (allocations from the chunk are out of the space in
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38 // the Chunk after the header for the Chunk) where as Metachunks
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39 // point to space in a VirtualSpace. To replace Metachunks with
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40 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
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41
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42 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
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43
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44 size_t Metachunk::_overhead =
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45 Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord;
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46
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47 // Metachunk methods
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48
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49 Metachunk::Metachunk(size_t word_size,
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50 VirtualSpaceNode* container) :
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51 _word_size(word_size),
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52 _bottom(NULL),
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53 _end(NULL),
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54 _top(NULL),
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55 _next(NULL),
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56 _prev(NULL),
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57 _container(container)
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58 {
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59 _bottom = (MetaWord*)this;
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60 _top = (MetaWord*)this + _overhead;
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61 _end = (MetaWord*)this + word_size;
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62 #ifdef ASSERT
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63 set_is_free(false);
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64 size_t data_word_size = pointer_delta(end(),
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65 top(),
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66 sizeof(MetaWord));
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67 Copy::fill_to_words((HeapWord*) top(),
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68 data_word_size,
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69 metadata_chunk_initialize);
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70 #endif
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71 }
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72
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73 MetaWord* Metachunk::allocate(size_t word_size) {
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74 MetaWord* result = NULL;
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75 // If available, bump the pointer to allocate.
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76 if (free_word_size() >= word_size) {
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77 result = _top;
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78 _top = _top + word_size;
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79 }
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80 return result;
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81 }
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82
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83 // _bottom points to the start of the chunk including the overhead.
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84 size_t Metachunk::used_word_size() const {
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85 return pointer_delta(_top, _bottom, sizeof(MetaWord));
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86 }
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87
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88 size_t Metachunk::free_word_size() const {
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89 return pointer_delta(_end, _top, sizeof(MetaWord));
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90 }
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91
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92 size_t Metachunk::capacity_word_size() const {
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93 return pointer_delta(_end, _bottom, sizeof(MetaWord));
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94 }
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95
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96 void Metachunk::print_on(outputStream* st) const {
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97 st->print_cr("Metachunk:"
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98 " bottom " PTR_FORMAT " top " PTR_FORMAT
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99 " end " PTR_FORMAT " size " SIZE_FORMAT,
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100 bottom(), top(), end(), word_size());
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101 if (Verbose) {
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102 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
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103 used_word_size(), free_word_size());
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104 }
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105 }
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106
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107 #ifndef PRODUCT
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108 void Metachunk::mangle() {
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109 // Mangle the payload of the chunk and not the links that
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110 // maintain list of chunks.
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111 HeapWord* start = (HeapWord*)(bottom() + overhead());
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112 size_t word_size = capacity_word_size() - overhead();
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113 Copy::fill_to_words(start, word_size, metadata_chunk_initialize);
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114 }
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115 #endif // PRODUCT
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116
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117 void Metachunk::verify() {
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118 #ifdef ASSERT
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119 // Cannot walk through the blocks unless the blocks have
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120 // headers with sizes.
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121 assert(_bottom <= _top &&
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122 _top <= _end,
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123 "Chunk has been smashed");
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124 #endif
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125 return;
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126 }