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1 /*
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2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The VM_CMS_Operation is slightly different from
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26 // a VM_GC_Operation -- and would not have subclassed easily
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27 // to VM_GC_Operation without several changes to VM_GC_Operation.
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28 // To minimize the changes, we have replicated some of the VM_GC_Operation
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29 // functionality here. We will consolidate that back by doing subclassing
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30 // as appropriate in Dolphin.
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31 //
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32 // VM_Operation
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33 // VM_CMS_Operation
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34 // - implements the common portion of work done in support
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35 // of CMS' stop-world phases (initial mark and remark).
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36 //
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37 // VM_CMS_Initial_Mark
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38 // VM_CMS_Final_Mark
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39 //
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40
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41 // Forward decl.
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42 class CMSCollector;
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43
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44 class VM_CMS_Operation: public VM_Operation {
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45 protected:
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46 CMSCollector* _collector; // associated collector
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47 bool _prologue_succeeded; // whether doit_prologue succeeded
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48
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49 bool lost_race() const;
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50
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51 // java.lang.ref.Reference support
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52 void acquire_pending_list_lock();
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53 void release_and_notify_pending_list_lock();
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54
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55 public:
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56 VM_CMS_Operation(CMSCollector* collector):
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57 _collector(collector),
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58 _prologue_succeeded(false) {}
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59 ~VM_CMS_Operation() {}
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60
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61 // The legal collector state for executing this CMS op.
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62 virtual const CMSCollector::CollectorState legal_state() const = 0;
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63
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64 // Whether the pending list lock needs to be held
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65 virtual const bool needs_pll() const = 0;
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66
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67 // Execute operations in the context of the caller,
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68 // prior to execution of the vm operation itself.
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69 virtual bool doit_prologue();
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70 // Execute operations in the context of the caller,
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71 // following completion of the vm operation.
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72 virtual void doit_epilogue();
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73
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74 virtual bool evaluate_at_safepoint() const { return true; }
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75 virtual bool is_cheap_allocated() const { return false; }
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76 virtual bool allow_nested_vm_operations() const { return false; }
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77 bool prologue_succeeded() const { return _prologue_succeeded; }
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78
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79 void verify_before_gc();
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80 void verify_after_gc();
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81 };
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82
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83
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84 // VM_CMS_Operation for the initial marking phase of CMS.
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85 class VM_CMS_Initial_Mark: public VM_CMS_Operation {
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86 public:
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87 VM_CMS_Initial_Mark(CMSCollector* _collector) :
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88 VM_CMS_Operation(_collector) {}
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89
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90 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
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91 virtual void doit();
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92
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93 virtual const CMSCollector::CollectorState legal_state() const {
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94 return CMSCollector::InitialMarking;
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95 }
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96
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97 virtual const bool needs_pll() const {
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98 return false;
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99 }
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100 };
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101
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102 // VM_CMS_Operation for the final remark phase of CMS.
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103 class VM_CMS_Final_Remark: public VM_CMS_Operation {
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104 public:
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105 VM_CMS_Final_Remark(CMSCollector* _collector) :
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106 VM_CMS_Operation(_collector) {}
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107 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
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108 virtual void doit();
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109
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110 virtual const CMSCollector::CollectorState legal_state() const {
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111 return CMSCollector::FinalMarking;
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112 }
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113
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114 virtual const bool needs_pll() const {
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115 return true;
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116 }
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117 };
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118
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119
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120 // VM operation to invoke a concurrent collection of the heap as a
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121 // GenCollectedHeap heap.
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122 class VM_GenCollectFullConcurrent: public VM_GC_Operation {
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123 public:
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124 VM_GenCollectFullConcurrent(unsigned int gc_count_before,
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125 unsigned int full_gc_count_before,
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126 GCCause::Cause gc_cause)
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127 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) {
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128 _gc_cause = gc_cause;
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129 assert(FullGCCount_lock != NULL && UseConcMarkSweepGC &&
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130 ExplicitGCInvokesConcurrent, "Otherwise shouldn't be here");
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131 assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
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132 }
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133 ~VM_GenCollectFullConcurrent() {}
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134 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
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135 virtual void doit();
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136 virtual void doit_epilogue();
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137 virtual bool is_cheap_allocated() const { return false; }
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138 virtual bool evaluate_at_safepoint() const;
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139 };
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