29 #include "memory/memRegion.hpp"
30 #include "oops/oopsHierarchy.hpp"
31
32 class CodeBlob;
33 class nmethod;
34 class ReferenceDiscoverer;
35 class DataLayout;
36 class KlassClosure;
37 class ClassLoaderData;
38 class Symbol;
39
40 // The following classes are C++ `closures` for iterating over objects, roots and spaces
41
42 class Closure : public StackObj { };
43
44 // OopClosure is used for iterating through references to Java objects.
45 class OopClosure : public Closure {
46 public:
47 virtual void do_oop(oop* o) = 0;
48 virtual void do_oop(narrowOop* o) = 0;
49 };
50
51 class DoNothingClosure : public OopClosure {
52 public:
53 virtual void do_oop(oop* p) {}
54 virtual void do_oop(narrowOop* p) {}
55 };
56 extern DoNothingClosure do_nothing_cl;
57
58 // OopIterateClosure adds extra code to be run during oop iterations.
59 // This is needed by the GC and is extracted to a separate type to not
60 // pollute the OopClosure interface.
61 class OopIterateClosure : public OopClosure {
62 private:
63 ReferenceDiscoverer* _ref_discoverer;
64
65 protected:
66 OopIterateClosure(ReferenceDiscoverer* rd) : _ref_discoverer(rd) { }
67 OopIterateClosure() : _ref_discoverer(NULL) { }
68 ~OopIterateClosure() { }
95 virtual void do_klass(Klass* k) = 0;
96 virtual void do_cld(ClassLoaderData* cld) = 0;
97
98 #ifdef ASSERT
99 // Default verification of each visited oop field.
100 template <typename T> void verify(T* p);
101
102 // Can be used by subclasses to turn off the default verification of oop fields.
103 virtual bool should_verify_oops() { return true; }
104 #endif
105 };
106
107 // An OopIterateClosure that can be used when there's no need to visit the Metadata.
108 class BasicOopIterateClosure : public OopIterateClosure {
109 public:
110 BasicOopIterateClosure(ReferenceDiscoverer* rd = NULL) : OopIterateClosure(rd) {}
111
112 virtual bool do_metadata() { return false; }
113 virtual void do_klass(Klass* k) { ShouldNotReachHere(); }
114 virtual void do_cld(ClassLoaderData* cld) { ShouldNotReachHere(); }
115 };
116
117 class KlassClosure : public Closure {
118 public:
119 virtual void do_klass(Klass* k) = 0;
120 };
121
122 class CLDClosure : public Closure {
123 public:
124 virtual void do_cld(ClassLoaderData* cld) = 0;
125 };
126
127
128 class CLDToOopClosure : public CLDClosure {
129 OopClosure* _oop_closure;
130 int _cld_claim;
131
132 public:
133 CLDToOopClosure(OopClosure* oop_closure,
134 int cld_claim) :
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29 #include "memory/memRegion.hpp"
30 #include "oops/oopsHierarchy.hpp"
31
32 class CodeBlob;
33 class nmethod;
34 class ReferenceDiscoverer;
35 class DataLayout;
36 class KlassClosure;
37 class ClassLoaderData;
38 class Symbol;
39
40 // The following classes are C++ `closures` for iterating over objects, roots and spaces
41
42 class Closure : public StackObj { };
43
44 // OopClosure is used for iterating through references to Java objects.
45 class OopClosure : public Closure {
46 public:
47 virtual void do_oop(oop* o) = 0;
48 virtual void do_oop(narrowOop* o) = 0;
49 virtual void do_oop_no_buffering(oop* o) { do_oop(o); }
50 virtual void do_oop_no_buffering(narrowOop* o) { do_oop(o); }
51 };
52
53 class DoNothingClosure : public OopClosure {
54 public:
55 virtual void do_oop(oop* p) {}
56 virtual void do_oop(narrowOop* p) {}
57 };
58 extern DoNothingClosure do_nothing_cl;
59
60 // OopIterateClosure adds extra code to be run during oop iterations.
61 // This is needed by the GC and is extracted to a separate type to not
62 // pollute the OopClosure interface.
63 class OopIterateClosure : public OopClosure {
64 private:
65 ReferenceDiscoverer* _ref_discoverer;
66
67 protected:
68 OopIterateClosure(ReferenceDiscoverer* rd) : _ref_discoverer(rd) { }
69 OopIterateClosure() : _ref_discoverer(NULL) { }
70 ~OopIterateClosure() { }
97 virtual void do_klass(Klass* k) = 0;
98 virtual void do_cld(ClassLoaderData* cld) = 0;
99
100 #ifdef ASSERT
101 // Default verification of each visited oop field.
102 template <typename T> void verify(T* p);
103
104 // Can be used by subclasses to turn off the default verification of oop fields.
105 virtual bool should_verify_oops() { return true; }
106 #endif
107 };
108
109 // An OopIterateClosure that can be used when there's no need to visit the Metadata.
110 class BasicOopIterateClosure : public OopIterateClosure {
111 public:
112 BasicOopIterateClosure(ReferenceDiscoverer* rd = NULL) : OopIterateClosure(rd) {}
113
114 virtual bool do_metadata() { return false; }
115 virtual void do_klass(Klass* k) { ShouldNotReachHere(); }
116 virtual void do_cld(ClassLoaderData* cld) { ShouldNotReachHere(); }
117 };
118
119 class BufferedValueClosure : public Closure {
120 public:
121 virtual void do_buffered_value(oop* p) = 0;
122 };
123
124 class KlassClosure : public Closure {
125 public:
126 virtual void do_klass(Klass* k) = 0;
127 };
128
129 class CLDClosure : public Closure {
130 public:
131 virtual void do_cld(ClassLoaderData* cld) = 0;
132 };
133
134
135 class CLDToOopClosure : public CLDClosure {
136 OopClosure* _oop_closure;
137 int _cld_claim;
138
139 public:
140 CLDToOopClosure(OopClosure* oop_closure,
141 int cld_claim) :
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