1 /* |
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2 * Copyright (c) 2005, 2019, 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_GC_CMS_CMSVMOPERATIONS_HPP |
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26 #define SHARE_GC_CMS_CMSVMOPERATIONS_HPP |
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27 |
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28 #include "gc/cms/concurrentMarkSweepGeneration.hpp" |
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29 #include "gc/shared/gcCause.hpp" |
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30 #include "gc/shared/gcId.hpp" |
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31 #include "gc/shared/gcVMOperations.hpp" |
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32 #include "runtime/vmOperations.hpp" |
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33 |
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34 // The VM_CMS_Operation is slightly different from |
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35 // a VM_GC_Operation -- and would not have subclassed easily |
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36 // to VM_GC_Operation without several changes to VM_GC_Operation. |
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37 // To minimize the changes, we have replicated some of the VM_GC_Operation |
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38 // functionality here. We will consolidate that back by doing subclassing |
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39 // as appropriate in Dolphin. |
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40 // |
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41 // VM_Operation |
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42 // VM_CMS_Operation |
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43 // - implements the common portion of work done in support |
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44 // of CMS' stop-world phases (initial mark and remark). |
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45 // |
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46 // VM_CMS_Initial_Mark |
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47 // VM_CMS_Final_Mark |
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48 // |
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49 |
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50 // Forward decl. |
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51 class CMSCollector; |
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52 |
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53 class VM_CMS_Operation: public VM_Operation { |
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54 protected: |
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55 CMSCollector* _collector; // associated collector |
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56 bool _prologue_succeeded; // whether doit_prologue succeeded |
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57 uint _gc_id; |
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58 |
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59 bool lost_race() const; |
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60 |
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61 public: |
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62 VM_CMS_Operation(CMSCollector* collector): |
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63 _collector(collector), |
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64 _prologue_succeeded(false), |
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65 _gc_id(GCId::current()) {} |
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66 ~VM_CMS_Operation() {} |
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67 |
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68 // The legal collector state for executing this CMS op. |
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69 virtual const CMSCollector::CollectorState legal_state() const = 0; |
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70 |
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71 // Whether the pending list lock needs to be held |
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72 virtual const bool needs_pending_list_lock() const = 0; |
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73 |
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74 // Execute operations in the context of the caller, |
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75 // prior to execution of the vm operation itself. |
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76 virtual bool doit_prologue(); |
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77 // Execute operations in the context of the caller, |
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78 // following completion of the vm operation. |
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79 virtual void doit_epilogue(); |
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80 |
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81 virtual bool evaluate_at_safepoint() const { return true; } |
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82 virtual bool is_cheap_allocated() const { return false; } |
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83 virtual bool allow_nested_vm_operations() const { return false; } |
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84 bool prologue_succeeded() const { return _prologue_succeeded; } |
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85 |
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86 void verify_before_gc(); |
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87 void verify_after_gc(); |
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88 }; |
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89 |
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90 |
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91 // VM_CMS_Operation for the initial marking phase of CMS. |
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92 class VM_CMS_Initial_Mark: public VM_CMS_Operation { |
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93 public: |
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94 VM_CMS_Initial_Mark(CMSCollector* _collector) : |
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95 VM_CMS_Operation(_collector) {} |
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96 |
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97 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; } |
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98 virtual void doit(); |
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99 |
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100 virtual const CMSCollector::CollectorState legal_state() const { |
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101 return CMSCollector::InitialMarking; |
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102 } |
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103 |
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104 virtual const bool needs_pending_list_lock() const { |
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105 return false; |
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106 } |
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107 }; |
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108 |
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109 // VM_CMS_Operation for the final remark phase of CMS. |
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110 class VM_CMS_Final_Remark: public VM_CMS_Operation { |
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111 public: |
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112 VM_CMS_Final_Remark(CMSCollector* _collector) : |
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113 VM_CMS_Operation(_collector) {} |
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114 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; } |
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115 virtual void doit(); |
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116 |
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117 virtual const CMSCollector::CollectorState legal_state() const { |
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118 return CMSCollector::FinalMarking; |
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119 } |
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120 |
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121 virtual const bool needs_pending_list_lock() const { |
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122 return true; |
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123 } |
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124 }; |
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125 |
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126 |
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127 // VM operation to invoke a concurrent collection of the heap as a |
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128 // GenCollectedHeap heap. |
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129 class VM_GenCollectFullConcurrent: public VM_GC_Operation { |
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130 public: |
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131 VM_GenCollectFullConcurrent(uint gc_count_before, |
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132 uint full_gc_count_before, |
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133 GCCause::Cause gc_cause) |
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134 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */) |
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135 { |
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136 assert(FullGCCount_lock != NULL, "Error"); |
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137 } |
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138 ~VM_GenCollectFullConcurrent() {} |
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139 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; } |
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140 virtual void doit(); |
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141 virtual void doit_epilogue(); |
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142 virtual bool is_cheap_allocated() const { return false; } |
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143 virtual bool evaluate_at_safepoint() const; |
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144 }; |
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145 |
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146 #endif // SHARE_GC_CMS_CMSVMOPERATIONS_HPP |
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