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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 10405:f2110083203d

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8005849: JEP 167: Event-Based JVM Tracing Reviewed-by: acorn, coleenp, sla Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
author sla
date Mon, 10 Jun 2013 11:30:51 +0200
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children 55a0da3d420b
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1 /*
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2 * Copyright (c) 1997, 2013, 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_SHARED_MARKSWEEP_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP
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27
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28 #include "gc_interface/collectedHeap.hpp"
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29 #include "memory/universe.hpp"
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30 #include "oops/markOop.hpp"
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31 #include "oops/oop.hpp"
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32 #include "runtime/timer.hpp"
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33 #include "utilities/growableArray.hpp"
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34 #include "utilities/stack.hpp"
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35 #include "utilities/taskqueue.hpp"
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36
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37 class ReferenceProcessor;
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38 class DataLayout;
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39 class SerialOldTracer;
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40 class STWGCTimer;
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41
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42 // MarkSweep takes care of global mark-compact garbage collection for a
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43 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All
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44 // generations are assumed to support marking; those that can also support
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45 // compaction.
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46 //
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47 // Class unloading will only occur when a full gc is invoked.
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48
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49 // declared at end
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50 class PreservedMark;
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51
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52 class MarkSweep : AllStatic {
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53 //
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54 // Inline closure decls
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55 //
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56 class FollowRootClosure: public OopsInGenClosure {
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57 public:
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58 virtual void do_oop(oop* p);
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59 virtual void do_oop(narrowOop* p);
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60 };
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61
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62 class MarkAndPushClosure: public OopClosure {
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63 public:
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64 virtual void do_oop(oop* p);
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65 virtual void do_oop(narrowOop* p);
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66 };
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67
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68 // The one and only place to start following the classes.
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69 // Should only be applied to the ClassLoaderData klasses list.
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70 class FollowKlassClosure : public KlassClosure {
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71 public:
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72 void do_klass(Klass* klass);
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73 };
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74 class AdjustKlassClosure : public KlassClosure {
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75 public:
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76 void do_klass(Klass* klass);
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77 };
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78
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79 class FollowStackClosure: public VoidClosure {
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80 public:
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81 virtual void do_void();
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82 };
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83
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84 class AdjustPointerClosure: public OopsInGenClosure {
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85 public:
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86 virtual void do_oop(oop* p);
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87 virtual void do_oop(narrowOop* p);
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88 };
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89
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90 // Used for java/lang/ref handling
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91 class IsAliveClosure: public BoolObjectClosure {
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92 public:
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93 virtual bool do_object_b(oop p);
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94 };
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95
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96 class KeepAliveClosure: public OopClosure {
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97 protected:
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98 template <class T> void do_oop_work(T* p);
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99 public:
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100 virtual void do_oop(oop* p);
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101 virtual void do_oop(narrowOop* p);
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102 };
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103
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104 //
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105 // Friend decls
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106 //
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107 friend class AdjustPointerClosure;
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108 friend class KeepAliveClosure;
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109 friend class VM_MarkSweep;
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110 friend void marksweep_init();
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111
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112 //
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113 // Vars
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114 //
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115 protected:
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116 // Total invocations of a MarkSweep collection
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117 static uint _total_invocations;
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118
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119 // Traversal stacks used during phase1
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120 static Stack<oop, mtGC> _marking_stack;
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121 static Stack<ObjArrayTask, mtGC> _objarray_stack;
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122
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123 // Space for storing/restoring mark word
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124 static Stack<markOop, mtGC> _preserved_mark_stack;
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125 static Stack<oop, mtGC> _preserved_oop_stack;
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126 static size_t _preserved_count;
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127 static size_t _preserved_count_max;
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128 static PreservedMark* _preserved_marks;
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129
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130 // Reference processing (used in ...follow_contents)
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131 static ReferenceProcessor* _ref_processor;
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132
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133 static STWGCTimer* _gc_timer;
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134 static SerialOldTracer* _gc_tracer;
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135
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136 // Non public closures
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137 static KeepAliveClosure keep_alive;
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138
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139 // Debugging
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140 static void trace(const char* msg) PRODUCT_RETURN;
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141
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142 public:
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143 // Public closures
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144 static IsAliveClosure is_alive;
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145 static FollowRootClosure follow_root_closure;
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146 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure
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147 static MarkAndPushClosure mark_and_push_closure;
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148 static FollowKlassClosure follow_klass_closure;
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149 static FollowStackClosure follow_stack_closure;
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150 static AdjustPointerClosure adjust_pointer_closure;
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151 static AdjustKlassClosure adjust_klass_closure;
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152
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153 // Accessors
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154 static uint total_invocations() { return _total_invocations; }
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155
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156 // Reference Processing
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157 static ReferenceProcessor* const ref_processor() { return _ref_processor; }
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158
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159 static STWGCTimer* gc_timer() { return _gc_timer; }
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160 static SerialOldTracer* gc_tracer() { return _gc_tracer; }
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161
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162 // Call backs for marking
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163 static void mark_object(oop obj);
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164 // Mark pointer and follow contents. Empty marking stack afterwards.
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165 template <class T> static inline void follow_root(T* p);
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166
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167 // Check mark and maybe push on marking stack
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168 template <class T> static void mark_and_push(T* p);
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169
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170 static inline void push_objarray(oop obj, size_t index);
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171
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172 static void follow_stack(); // Empty marking stack.
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173
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174 static void follow_klass(Klass* klass);
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175 static void adjust_klass(Klass* klass);
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176
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177 static void follow_class_loader(ClassLoaderData* cld);
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178 static void adjust_class_loader(ClassLoaderData* cld);
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179
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180 static void preserve_mark(oop p, markOop mark);
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181 // Save the mark word so it can be restored later
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182 static void adjust_marks(); // Adjust the pointers in the preserved marks table
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183 static void restore_marks(); // Restore the marks that we saved in preserve_mark
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184
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185 template <class T> static inline void adjust_pointer(T* p);
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186 };
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187
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188 class PreservedMark VALUE_OBJ_CLASS_SPEC {
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189 private:
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190 oop _obj;
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191 markOop _mark;
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192
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193 public:
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194 void init(oop obj, markOop mark) {
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195 _obj = obj;
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196 _mark = mark;
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197 }
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198
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199 void adjust_pointer() {
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200 MarkSweep::adjust_pointer(&_obj);
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201 }
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202
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203 void restore() {
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204 _obj->set_mark(_mark);
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205 }
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206 };
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207
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208 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP