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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 95f6641e38e0
children 47bdfb3d010f
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1 /*
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2 * Copyright (c) 2002, 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_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
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27
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28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
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29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
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30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
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31 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
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32 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
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33 #include "memory/iterator.hpp"
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34
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35 inline void PSScavenge::save_to_space_top_before_gc() {
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36 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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37 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
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38 }
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39
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40 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
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41 T heap_oop = oopDesc::load_heap_oop(p);
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42 if (oopDesc::is_null(heap_oop)) return false;
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43 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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44 return PSScavenge::is_obj_in_young((HeapWord*)obj);
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45 }
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46
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47 template <class T>
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48 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
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49 if (should_scavenge(p)) {
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50 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
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51 // Skip objects copied to to_space since the scavenge started.
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52 HeapWord* const addr = (HeapWord*)obj;
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53 return addr < to_space_top_before_gc() || addr >= to_space->end();
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54 }
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55 return false;
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56 }
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57
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58 template <class T>
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59 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
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60 if (check_to_space) {
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61 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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62 return should_scavenge(p, heap->young_gen()->to_space());
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63 }
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64 return should_scavenge(p);
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65 }
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66
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67 // Attempt to "claim" oop at p via CAS, push the new obj if successful
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68 // This version tests the oop* to make sure it is within the heap before
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69 // attempting marking.
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70 template <class T, bool promote_immediately>
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71 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
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72 T* p) {
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73 assert(should_scavenge(p, true), "revisiting object?");
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74
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75 oop o = oopDesc::load_decode_heap_oop_not_null(p);
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76 oop new_obj = o->is_forwarded()
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77 ? o->forwardee()
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78 : pm->copy_to_survivor_space<promote_immediately>(o);
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79
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80 #ifndef PRODUCT
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81 // This code must come after the CAS test, or it will print incorrect
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82 // information.
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83 if (TraceScavenge && o->is_forwarded()) {
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84 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
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85 "forwarding",
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86 new_obj->klass()->internal_name(), o, new_obj, new_obj->size());
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87 }
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88 #endif
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89
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90 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
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91
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92 // We cannot mark without test, as some code passes us pointers
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93 // that are outside the heap. These pointers are either from roots
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94 // or from metadata.
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95 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
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96 Universe::heap()->is_in_reserved(p)) {
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97 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
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98 card_table()->inline_write_ref_field_gc(p, new_obj);
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99 }
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100 }
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101 }
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102
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103 template<bool promote_immediately>
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104 class PSRootsClosure: public OopClosure {
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105 private:
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106 PSPromotionManager* _promotion_manager;
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107
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108 protected:
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109 template <class T> void do_oop_work(T *p) {
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110 if (PSScavenge::should_scavenge(p)) {
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111 // We never card mark roots, maybe call a func without test?
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112 PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, p);
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113 }
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114 }
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115 public:
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116 PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
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117 void do_oop(oop* p) { PSRootsClosure::do_oop_work(p); }
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118 void do_oop(narrowOop* p) { PSRootsClosure::do_oop_work(p); }
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119 };
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120
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121 typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure;
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122 typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure;
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123
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124 // Scavenges a single oop in a Klass.
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125 class PSScavengeFromKlassClosure: public OopClosure {
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126 private:
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127 PSPromotionManager* _pm;
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128 // Used to redirty a scanned klass if it has oops
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129 // pointing to the young generation after being scanned.
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130 Klass* _scanned_klass;
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131 public:
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132 PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { }
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133 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
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134 void do_oop(oop* p) {
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135 ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
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136 assert(!psh->is_in_reserved(p), "GC barrier needed");
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137 if (PSScavenge::should_scavenge(p)) {
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138 assert(!Universe::heap()->is_in_reserved(p), "Not from meta-data?");
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139 assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
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140
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141 oop o = *p;
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142 oop new_obj;
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143 if (o->is_forwarded()) {
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144 new_obj = o->forwardee();
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145 } else {
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146 new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o);
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147 }
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148 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
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149
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150 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
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151 do_klass_barrier();
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152 }
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153 }
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154 }
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155
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156 void set_scanned_klass(Klass* klass) {
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157 assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time");
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158 _scanned_klass = klass;
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159 }
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160
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161 private:
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162 void do_klass_barrier() {
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163 assert(_scanned_klass != NULL, "Should not be called without having a scanned klass");
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164 _scanned_klass->record_modified_oops();
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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 // Scavenges the oop in a Klass.
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170 class PSScavengeKlassClosure: public KlassClosure {
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171 private:
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172 PSScavengeFromKlassClosure _oop_closure;
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173 protected:
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174 public:
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175 PSScavengeKlassClosure(PSPromotionManager* pm) : _oop_closure(pm) { }
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176 void do_klass(Klass* klass) {
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177 // If the klass has not been dirtied we know that there's
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178 // no references into the young gen and we can skip it.
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179
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180 #ifndef PRODUCT
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181 if (TraceScavenge) {
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182 ResourceMark rm;
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183 gclog_or_tty->print_cr("PSScavengeKlassClosure::do_klass %p, %s, dirty: %s",
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184 klass,
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185 klass->external_name(),
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186 klass->has_modified_oops() ? "true" : "false");
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187 }
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188 #endif
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189
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190 if (klass->has_modified_oops()) {
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191 // Clean the klass since we're going to scavenge all the metadata.
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192 klass->clear_modified_oops();
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193
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194 // Setup the promotion manager to redirty this klass
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195 // if references are left in the young gen.
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196 _oop_closure.set_scanned_klass(klass);
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197
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198 klass->oops_do(&_oop_closure);
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199
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200 _oop_closure.set_scanned_klass(NULL);
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201 }
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202 }
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203 };
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204
1972
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205 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP