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annotate src/share/vm/memory/metachunk.cpp @ 7446:e51c9860cf66

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8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders Reviewed-by: johnc, coleenp
author jmasa
date Mon, 03 Dec 2012 15:09:39 -0800
parents eade6b2e4782
children c23dbf0e8ab7
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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 //
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32 // Future modification
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33 //
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34 // The Metachunk can conceivable be replaced by the Chunk in
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35 // allocation.hpp. Note that the latter Chunk is the space for
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36 // allocation (allocations from the chunk are out of the space in
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37 // the Chunk after the header for the Chunk) where as Metachunks
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38 // point to space in a VirtualSpace. To replace Metachunks with
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39 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
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40
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41 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
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42
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43 size_t Metachunk::_overhead =
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44 Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord;
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45
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46 // Metachunk methods
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47
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48 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) {
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49 // Set bottom, top, and end. Allow space for the Metachunk itself
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50 Metachunk* chunk = (Metachunk*) ptr;
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51
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52 MetaWord* chunk_bottom = ptr + _overhead;
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53 chunk->set_bottom(ptr);
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54 chunk->set_top(chunk_bottom);
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55 MetaWord* chunk_end = ptr + word_size;
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56 assert(chunk_end > chunk_bottom, "Chunk must be too small");
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57 chunk->set_end(chunk_end);
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58 chunk->set_next(NULL);
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59 chunk->set_prev(NULL);
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60 chunk->set_word_size(word_size);
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61 #ifdef ASSERT
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62 size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord));
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63 Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize);
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64 #endif
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65 return chunk;
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66 }
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67
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68
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69 MetaWord* Metachunk::allocate(size_t word_size) {
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70 MetaWord* result = NULL;
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71 // If available, bump the pointer to allocate.
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72 if (free_word_size() >= word_size) {
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73 result = _top;
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74 _top = _top + word_size;
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75 }
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76 return result;
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77 }
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78
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79 // _bottom points to the start of the chunk including the overhead.
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80 size_t Metachunk::used_word_size() const {
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81 return pointer_delta(_top, _bottom, sizeof(MetaWord));
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82 }
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83
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84 size_t Metachunk::free_word_size() const {
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85 return pointer_delta(_end, _top, sizeof(MetaWord));
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86 }
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87
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88 size_t Metachunk::capacity_word_size() const {
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89 return pointer_delta(_end, _bottom, sizeof(MetaWord));
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90 }
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91
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92 void Metachunk::print_on(outputStream* st) const {
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93 st->print_cr("Metachunk:"
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94 " bottom " PTR_FORMAT " top " PTR_FORMAT
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95 " end " PTR_FORMAT " size " SIZE_FORMAT,
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96 bottom(), top(), end(), word_size());
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97 if (Verbose) {
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98 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
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99 used_word_size(), free_word_size());
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100 }
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101 }
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102
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103 #ifndef PRODUCT
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104 void Metachunk::mangle() {
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105 // Mangle the payload of the chunk and not the links that
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106 // maintain list of chunks.
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107 HeapWord* start = (HeapWord*)(bottom() + overhead());
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108 size_t word_size = capacity_word_size() - overhead();
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109 Copy::fill_to_words(start, word_size, metadata_chunk_initialize);
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110 }
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111 #endif // PRODUCT
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112
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113 void Metachunk::verify() {
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114 #ifdef ASSERT
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115 // Cannot walk through the blocks unless the blocks have
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116 // headers with sizes.
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117 assert(_bottom <= _top &&
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118 _top <= _end,
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119 "Chunk has been smashed");
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120 #endif
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121 return;
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122 }