1 /*
  2  * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
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 24 
 25 #ifndef SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP
 26 #define SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP
 27 
 28 #include "gc/shared/verifyOption.hpp"
 29 #include "memory/iterator.hpp"
 30 
 31 class G1CollectedHeap;
 32 class G1FullCollector;
 33 class G1CMBitMap;
 34 class G1FullGCMarker;
 35 
 36 // Below are closures used by the G1 Full GC.
 37 class G1IsAliveClosure : public BoolObjectClosure {
 38   G1FullCollector* _collector;
 39   G1CMBitMap* _bitmap;
 40 
 41 public:
 42   G1IsAliveClosure(G1FullCollector* collector);
 43   G1IsAliveClosure(G1FullCollector* collector, G1CMBitMap* bitmap) :
 44     _collector(collector), _bitmap(bitmap) { }
 45 
 46   virtual bool do_object_b(oop p);
 47 };
 48 
 49 class G1FullKeepAliveClosure: public OopClosure {
 50   G1FullGCMarker* _marker;
 51   template <class T>
 52   inline void do_oop_work(T* p);
 53 
 54 public:
 55   G1FullKeepAliveClosure(G1FullGCMarker* pm) : _marker(pm) { }
 56 
 57   virtual void do_oop(oop* p);
 58   virtual void do_oop(narrowOop* p);
 59 };
 60 
 61 class G1MarkAndPushClosure : public OopIterateClosure {
 62   G1FullGCMarker* _marker;
 63   uint _worker_id;
 64 
 65 public:
 66   G1MarkAndPushClosure(uint worker, G1FullGCMarker* marker, ReferenceDiscoverer* ref) :
 67     OopIterateClosure(ref),
 68     _marker(marker),
 69     _worker_id(worker) { }
 70 
 71   template <class T> inline void do_oop_work(T* p);
 72   virtual void do_oop(oop* p);
 73   virtual void do_oop(narrowOop* p);
 74 
 75   virtual bool do_metadata();
 76   virtual void do_klass(Klass* k);
 77   virtual void do_cld(ClassLoaderData* cld);
 78   virtual void do_method(Method* m);
 79   virtual void do_nmethod(nmethod* nm);
 80 };
 81 
 82 class G1AdjustClosure : public BasicOopIterateClosure {
 83   G1FullCollector* _collector;
 84 
 85   template <class T> inline void adjust_pointer(T* p);
 86 public:
 87   G1AdjustClosure(G1FullCollector* collector) : _collector(collector) { }
 88   template <class T> void do_oop_work(T* p) { adjust_pointer(p); }
 89   virtual void do_oop(oop* p);
 90   virtual void do_oop(narrowOop* p);
 91 
 92   virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
 93 };
 94 
 95 class G1VerifyOopClosure: public BasicOopIterateClosure {
 96 private:
 97   G1CollectedHeap* _g1h;
 98   bool             _failures;
 99   oop              _containing_obj;
100   VerifyOption     _verify_option;
101 
102 public:
103   int _cc;
104   G1VerifyOopClosure(VerifyOption option);
105 
106   void set_containing_obj(oop obj) {
107     _containing_obj = obj;
108   }
109 
110   bool failures() { return _failures; }
111   void print_object(outputStream* out, oop obj);
112 
113   template <class T> void do_oop_work(T* p);
114 
115   void do_oop(oop* p)       { do_oop_work(p); }
116   void do_oop(narrowOop* p) { do_oop_work(p); }
117 };
118 
119 class G1FollowStackClosure: public VoidClosure {
120   G1FullGCMarker* _marker;
121 
122 public:
123   G1FollowStackClosure(G1FullGCMarker* marker) : _marker(marker) {}
124   virtual void do_void();
125 };
126 
127 #endif // SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP
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