1 /*
   2  * Copyright (c) 2017, 2018, 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
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP
  26 #define SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP
  27 
  28 #include "memory/iterator.hpp"
  29 #include "memory/universe.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   G1CMBitMap* _bitmap;
  39 
  40 public:
  41   G1IsAliveClosure(G1CMBitMap* bitmap) : _bitmap(bitmap) { }
  42 
  43   virtual bool do_object_b(oop p);
  44 };
  45 
  46 class G1FullKeepAliveClosure: public OopClosure {
  47   G1FullGCMarker* _marker;
  48   template <class T>
  49   inline void do_oop_work(T* p);
  50 
  51 public:
  52   G1FullKeepAliveClosure(G1FullGCMarker* pm) : _marker(pm) { }
  53 
  54   virtual void do_oop(oop* p);
  55   virtual void do_oop(narrowOop* p);
  56 };
  57 
  58 class G1MarkAndPushClosure : public OopIterateClosure {
  59   G1FullGCMarker* _marker;
  60   uint _worker_id;
  61 
  62 public:
  63   G1MarkAndPushClosure(uint worker, G1FullGCMarker* marker, ReferenceDiscoverer* ref) :
  64     _marker(marker),
  65     _worker_id(worker),
  66     OopIterateClosure(ref) { }
  67 
  68   template <class T> inline void do_oop_work(T* p);
  69   virtual void do_oop(oop* p);
  70   virtual void do_oop(narrowOop* p);
  71 
  72   virtual bool do_metadata();
  73   virtual void do_klass(Klass* k);
  74   virtual void do_cld(ClassLoaderData* cld);
  75 };
  76 
  77 class G1AdjustClosure : public BasicOopIterateClosure {
  78   template <class T> static inline void adjust_pointer(T* p);
  79 public:
  80   template <class T> void do_oop_work(T* p) { adjust_pointer(p); }
  81   virtual void do_oop(oop* p);
  82   virtual void do_oop(narrowOop* p);
  83 
  84   virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
  85 };
  86 
  87 class G1VerifyOopClosure: public OopClosure {
  88 private:
  89   G1CollectedHeap* _g1h;
  90   bool             _failures;
  91   oop              _containing_obj;
  92   VerifyOption     _verify_option;
  93 
  94 public:
  95   int _cc;
  96   G1VerifyOopClosure(VerifyOption option);
  97 
  98   void set_containing_obj(oop obj) {
  99     _containing_obj = obj;
 100   }
 101 
 102   bool failures() { return _failures; }
 103   void print_object(outputStream* out, oop obj);
 104 
 105   template <class T> void do_oop_work(T* p);
 106 
 107   void do_oop(oop* p)       { do_oop_work(p); }
 108   void do_oop(narrowOop* p) { do_oop_work(p); }
 109 };
 110 
 111 class G1FollowStackClosure: public VoidClosure {
 112   G1FullGCMarker* _marker;
 113 
 114 public:
 115   G1FollowStackClosure(G1FullGCMarker* marker) : _marker(marker) {}
 116   virtual void do_void();
 117 };
 118 
 119 #endif // SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP