1 /*
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 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 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).
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24 
25 #ifndef SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP
27 
28 #include "oops/instanceKlass.hpp"
29 #include "utilities/macros.hpp"
30 
31 class ClassFileParser;
32 
33 // An InstanceClassLoaderKlass is a specialization of the InstanceKlass. It does
34 // not add any field.  It is added to walk the dependencies for the class loader
35 // key that this class loader points to.  This is how the loader_data graph is
36 // walked and dependant class loaders are kept alive.  I thought we walked
37 // the list later?
38 
39 class InstanceClassLoaderKlass: public InstanceKlass {
40   friend class VMStructs;
41   friend class InstanceKlass;
42 public:
43   static const KlassID ID = InstanceClassLoaderKlassID;
44 
45 private:
46   InstanceClassLoaderKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_class_loader, ID) {}
47 
48 public:
49   InstanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
50 
51   // GC specific object visitors
52   //
53 #if INCLUDE_PARALLELGC
54   // Parallel Compact
55   void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
56   void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
57 #endif
58 
59   // Oop fields (and metadata) iterators
60   //
61   // The InstanceClassLoaderKlass iterators also visit the CLD pointer (or mirror of anonymous klasses.)
62 
63  public:
64   // Forward iteration
65   // Iterate over the oop fields and metadata.
66   template <typename T, class OopClosureType>
67   inline void oop_oop_iterate(oop obj, OopClosureType* closure);
68 
69   // Reverse iteration
70   // Iterate over the oop fields and metadata.
71   template <typename T, class OopClosureType>
72   inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
73 
74   // Bounded range iteration
75   // Iterate over the oop fields and metadata.
76   template <typename T, class OopClosureType>
77   inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
78 };
79 
80 #endif // SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP