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annotate src/share/vm/gc_implementation/g1/heapRegion.inline.hpp @ 20278:2c6ef90f030a

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8049421: G1 Class Unloading after completing a concurrent mark cycle Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
author stefank
date Mon, 07 Jul 2014 10:12:40 +0200
parents 1526a938e670
children f3aeae1f9fc5
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1 /*
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2 * Copyright (c) 2001, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_INLINE_HPP
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27
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28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp"
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29 #include "gc_implementation/g1/g1CollectedHeap.hpp"
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30 #include "gc_implementation/g1/heapRegion.hpp"
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31 #include "memory/space.hpp"
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32 #include "runtime/atomic.inline.hpp"
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33
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34 // This version requires locking.
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35 inline HeapWord* G1OffsetTableContigSpace::allocate_impl(size_t size,
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36 HeapWord* const end_value) {
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37 HeapWord* obj = top();
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38 if (pointer_delta(end_value, obj) >= size) {
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39 HeapWord* new_top = obj + size;
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40 set_top(new_top);
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41 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");
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42 return obj;
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43 } else {
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44 return NULL;
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45 }
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46 }
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47
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48 // This version is lock-free.
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49 inline HeapWord* G1OffsetTableContigSpace::par_allocate_impl(size_t size,
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50 HeapWord* const end_value) {
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51 do {
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52 HeapWord* obj = top();
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53 if (pointer_delta(end_value, obj) >= size) {
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54 HeapWord* new_top = obj + size;
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55 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj);
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56 // result can be one of two:
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57 // the old top value: the exchange succeeded
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58 // otherwise: the new value of the top is returned.
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59 if (result == obj) {
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60 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");
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61 return obj;
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62 }
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63 } else {
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64 return NULL;
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65 }
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66 } while (true);
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67 }
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68
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69 inline HeapWord* G1OffsetTableContigSpace::allocate(size_t size) {
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70 HeapWord* res = allocate_impl(size, end());
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71 if (res != NULL) {
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72 _offsets.alloc_block(res, size);
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73 }
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74 return res;
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75 }
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76
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77 // Because of the requirement of keeping "_offsets" up to date with the
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78 // allocations, we sequentialize these with a lock. Therefore, best if
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79 // this is used for larger LAB allocations only.
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80 inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t size) {
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81 MutexLocker x(&_par_alloc_lock);
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82 return allocate(size);
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83 }
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84
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85 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) {
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86 return _offsets.block_start(p);
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87 }
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88
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89 inline HeapWord*
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90 G1OffsetTableContigSpace::block_start_const(const void* p) const {
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91 return _offsets.block_start_const(p);
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92 }
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93
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94 inline bool
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95 HeapRegion::block_is_obj(const HeapWord* p) const {
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96 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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97 return !g1h->is_obj_dead(oop(p), this);
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98 }
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99
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100 inline size_t
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101 HeapRegion::block_size(const HeapWord *addr) const {
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102 // Old regions' dead objects may have dead classes
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103 // We need to find the next live object in some other
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104 // manner than getting the oop size
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105 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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106 if (g1h->is_obj_dead(oop(addr), this)) {
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107 HeapWord* next = g1h->concurrent_mark()->prevMarkBitMap()->
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108 getNextMarkedWordAddress(addr, prev_top_at_mark_start());
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109
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110 assert(next > addr, "must get the next live object");
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111
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112 return pointer_delta(next, addr);
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113 } else if (addr == top()) {
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114 return pointer_delta(end(), addr);
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115 }
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116 return oop(addr)->size();
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117 }
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118
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119 inline HeapWord* HeapRegion::par_allocate_no_bot_updates(size_t word_size) {
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120 assert(is_young(), "we can only skip BOT updates on young regions");
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121 return par_allocate_impl(word_size, end());
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122 }
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123
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124 inline HeapWord* HeapRegion::allocate_no_bot_updates(size_t word_size) {
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125 assert(is_young(), "we can only skip BOT updates on young regions");
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126 return allocate_impl(word_size, end());
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127 }
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128
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129 inline void HeapRegion::note_start_of_marking() {
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130 _next_marked_bytes = 0;
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131 _next_top_at_mark_start = top();
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132 }
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133
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134 inline void HeapRegion::note_end_of_marking() {
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135 _prev_top_at_mark_start = _next_top_at_mark_start;
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136 _prev_marked_bytes = _next_marked_bytes;
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137 _next_marked_bytes = 0;
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138
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139 assert(_prev_marked_bytes <=
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140 (size_t) pointer_delta(prev_top_at_mark_start(), bottom()) *
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141 HeapWordSize, "invariant");
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142 }
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143
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144 inline void HeapRegion::note_start_of_copying(bool during_initial_mark) {
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145 if (is_survivor()) {
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146 // This is how we always allocate survivors.
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147 assert(_next_top_at_mark_start == bottom(), "invariant");
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148 } else {
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149 if (during_initial_mark) {
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150 // During initial-mark we'll explicitly mark any objects on old
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151 // regions that are pointed to by roots. Given that explicit
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152 // marks only make sense under NTAMS it'd be nice if we could
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153 // check that condition if we wanted to. Given that we don't
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154 // know where the top of this region will end up, we simply set
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155 // NTAMS to the end of the region so all marks will be below
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156 // NTAMS. We'll set it to the actual top when we retire this region.
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157 _next_top_at_mark_start = end();
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158 } else {
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159 // We could have re-used this old region as to-space over a
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160 // couple of GCs since the start of the concurrent marking
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161 // cycle. This means that [bottom,NTAMS) will contain objects
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162 // copied up to and including initial-mark and [NTAMS, top)
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163 // will contain objects copied during the concurrent marking cycle.
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164 assert(top() >= _next_top_at_mark_start, "invariant");
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165 }
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166 }
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167 }
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168
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169 inline void HeapRegion::note_end_of_copying(bool during_initial_mark) {
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170 if (is_survivor()) {
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171 // This is how we always allocate survivors.
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172 assert(_next_top_at_mark_start == bottom(), "invariant");
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173 } else {
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174 if (during_initial_mark) {
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175 // See the comment for note_start_of_copying() for the details
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176 // on this.
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177 assert(_next_top_at_mark_start == end(), "pre-condition");
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178 _next_top_at_mark_start = top();
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179 } else {
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180 // See the comment for note_start_of_copying() for the details
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181 // on this.
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182 assert(top() >= _next_top_at_mark_start, "invariant");
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183 }
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184 }
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185 }
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186
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187 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_INLINE_HPP