60 bool _prologue_succeeded; // whether doit_prologue succeeded
61 uint _gc_id;
62
63 bool lost_race() const;
64
65 // java.lang.ref.Reference support
66 void acquire_pending_list_lock();
67 void release_and_notify_pending_list_lock();
68
69 public:
70 VM_CMS_Operation(CMSCollector* collector):
71 _collector(collector),
72 _prologue_succeeded(false),
73 _gc_id(GCId::current()) {}
74 ~VM_CMS_Operation() {}
75
76 // The legal collector state for executing this CMS op.
77 virtual const CMSCollector::CollectorState legal_state() const = 0;
78
79 // Whether the pending list lock needs to be held
80 virtual const bool needs_pll() const = 0;
81
82 // Execute operations in the context of the caller,
83 // prior to execution of the vm operation itself.
84 virtual bool doit_prologue();
85 // Execute operations in the context of the caller,
86 // following completion of the vm operation.
87 virtual void doit_epilogue();
88
89 virtual bool evaluate_at_safepoint() const { return true; }
90 virtual bool is_cheap_allocated() const { return false; }
91 virtual bool allow_nested_vm_operations() const { return false; }
92 bool prologue_succeeded() const { return _prologue_succeeded; }
93
94 void verify_before_gc();
95 void verify_after_gc();
96 };
97
98
99 // VM_CMS_Operation for the initial marking phase of CMS.
100 class VM_CMS_Initial_Mark: public VM_CMS_Operation {
101 public:
102 VM_CMS_Initial_Mark(CMSCollector* _collector) :
103 VM_CMS_Operation(_collector) {}
104
105 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
106 virtual void doit();
107
108 virtual const CMSCollector::CollectorState legal_state() const {
109 return CMSCollector::InitialMarking;
110 }
111
112 virtual const bool needs_pll() const {
113 return false;
114 }
115 };
116
117 // VM_CMS_Operation for the final remark phase of CMS.
118 class VM_CMS_Final_Remark: public VM_CMS_Operation {
119 public:
120 VM_CMS_Final_Remark(CMSCollector* _collector) :
121 VM_CMS_Operation(_collector) {}
122 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
123 virtual void doit();
124
125 virtual const CMSCollector::CollectorState legal_state() const {
126 return CMSCollector::FinalMarking;
127 }
128
129 virtual const bool needs_pll() const {
130 return true;
131 }
132 };
133
134
135 // VM operation to invoke a concurrent collection of the heap as a
136 // GenCollectedHeap heap.
137 class VM_GenCollectFullConcurrent: public VM_GC_Operation {
138 public:
139 VM_GenCollectFullConcurrent(uint gc_count_before,
140 uint full_gc_count_before,
141 GCCause::Cause gc_cause)
142 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */)
143 {
144 assert(FullGCCount_lock != NULL, "Error");
145 }
146 ~VM_GenCollectFullConcurrent() {}
147 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
148 virtual void doit();
149 virtual void doit_epilogue();
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60 bool _prologue_succeeded; // whether doit_prologue succeeded
61 uint _gc_id;
62
63 bool lost_race() const;
64
65 // java.lang.ref.Reference support
66 void acquire_pending_list_lock();
67 void release_and_notify_pending_list_lock();
68
69 public:
70 VM_CMS_Operation(CMSCollector* collector):
71 _collector(collector),
72 _prologue_succeeded(false),
73 _gc_id(GCId::current()) {}
74 ~VM_CMS_Operation() {}
75
76 // The legal collector state for executing this CMS op.
77 virtual const CMSCollector::CollectorState legal_state() const = 0;
78
79 // Whether the pending list lock needs to be held
80 virtual const bool needs_pending_list_lock() const = 0;
81
82 // Execute operations in the context of the caller,
83 // prior to execution of the vm operation itself.
84 virtual bool doit_prologue();
85 // Execute operations in the context of the caller,
86 // following completion of the vm operation.
87 virtual void doit_epilogue();
88
89 virtual bool evaluate_at_safepoint() const { return true; }
90 virtual bool is_cheap_allocated() const { return false; }
91 virtual bool allow_nested_vm_operations() const { return false; }
92 bool prologue_succeeded() const { return _prologue_succeeded; }
93
94 void verify_before_gc();
95 void verify_after_gc();
96 };
97
98
99 // VM_CMS_Operation for the initial marking phase of CMS.
100 class VM_CMS_Initial_Mark: public VM_CMS_Operation {
101 public:
102 VM_CMS_Initial_Mark(CMSCollector* _collector) :
103 VM_CMS_Operation(_collector) {}
104
105 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
106 virtual void doit();
107
108 virtual const CMSCollector::CollectorState legal_state() const {
109 return CMSCollector::InitialMarking;
110 }
111
112 virtual const bool needs_pending_list_lock() const {
113 return false;
114 }
115 };
116
117 // VM_CMS_Operation for the final remark phase of CMS.
118 class VM_CMS_Final_Remark: public VM_CMS_Operation {
119 public:
120 VM_CMS_Final_Remark(CMSCollector* _collector) :
121 VM_CMS_Operation(_collector) {}
122 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
123 virtual void doit();
124
125 virtual const CMSCollector::CollectorState legal_state() const {
126 return CMSCollector::FinalMarking;
127 }
128
129 virtual const bool needs_pending_list_lock() const {
130 return true;
131 }
132 };
133
134
135 // VM operation to invoke a concurrent collection of the heap as a
136 // GenCollectedHeap heap.
137 class VM_GenCollectFullConcurrent: public VM_GC_Operation {
138 public:
139 VM_GenCollectFullConcurrent(uint gc_count_before,
140 uint full_gc_count_before,
141 GCCause::Cause gc_cause)
142 : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */)
143 {
144 assert(FullGCCount_lock != NULL, "Error");
145 }
146 ~VM_GenCollectFullConcurrent() {}
147 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
148 virtual void doit();
149 virtual void doit_epilogue();
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