25 #ifndef SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP
26 #define SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP
27
28 #include "memory/iterator.hpp"
29 #include "oops/oop.hpp"
30
31 class Generation;
32 class HeapWord;
33 class CardTableRS;
34 class CardTableModRefBS;
35 class DefNewGeneration;
36 class KlassRemSet;
37
38 // Closure for iterating roots from a particular generation
39 // Note: all classes deriving from this MUST call this do_barrier
40 // method at the end of their own do_oop method!
41 // Note: no do_oop defined, this is an abstract class.
42
43 class OopsInGenClosure : public ExtendedOopClosure {
44 private:
45 Generation* _orig_gen; // generation originally set in ctor
46 Generation* _gen; // generation being scanned
47
48 protected:
49 // Some subtypes need access.
50 HeapWord* _gen_boundary; // start of generation
51 CardTableRS* _rs; // remembered set
52
53 // For assertions
54 Generation* generation() { return _gen; }
55 CardTableRS* rs() { return _rs; }
56
57 // Derived classes that modify oops so that they might be old-to-young
58 // pointers must call the method below.
59 template <class T> void do_barrier(T* p);
60
61 // Version for use by closures that may be called in parallel code.
62 template <class T> void par_do_barrier(T* p);
63
64 public:
65 OopsInGenClosure() : ExtendedOopClosure(NULL),
66 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
67
68 OopsInGenClosure(Generation* gen);
69 void set_generation(Generation* gen);
70
71 void reset_generation() { _gen = _orig_gen; }
72
73 // Problem with static closures: must have _gen_boundary set at some point,
74 // but cannot do this until after the heap is initialized.
75 void set_orig_generation(Generation* gen) {
76 _orig_gen = gen;
77 set_generation(gen);
78 }
79
80 HeapWord* gen_boundary() { return _gen_boundary; }
81
82 };
83
84 // Super class for scan closures. It contains code to dirty scanned Klasses.
85 class OopsInKlassOrGenClosure: public OopsInGenClosure {
86 Klass* _scanned_klass;
87 public:
88 OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {}
89 void set_scanned_klass(Klass* k) {
90 assert(k == NULL || _scanned_klass == NULL, "Must be");
91 _scanned_klass = k;
92 }
93 bool is_scanning_a_klass() { return _scanned_klass != NULL; }
94 void do_klass_barrier();
95 };
96
97 // Closure for scanning DefNewGeneration.
98 //
99 // This closure will perform barrier store calls for ALL
100 // pointers in scanned oops.
101 class ScanClosure: public OopsInKlassOrGenClosure {
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25 #ifndef SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP
26 #define SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP
27
28 #include "memory/iterator.hpp"
29 #include "oops/oop.hpp"
30
31 class Generation;
32 class HeapWord;
33 class CardTableRS;
34 class CardTableModRefBS;
35 class DefNewGeneration;
36 class KlassRemSet;
37
38 // Closure for iterating roots from a particular generation
39 // Note: all classes deriving from this MUST call this do_barrier
40 // method at the end of their own do_oop method!
41 // Note: no do_oop defined, this is an abstract class.
42
43 class OopsInGenClosure : public ExtendedOopClosure {
44 private:
45 Generation* _gen; // generation being scanned
46
47 protected:
48 // Some subtypes need access.
49 HeapWord* _gen_boundary; // start of generation
50 CardTableRS* _rs; // remembered set
51
52 // For assertions
53 Generation* generation() { return _gen; }
54 CardTableRS* rs() { return _rs; }
55
56 // Derived classes that modify oops so that they might be old-to-young
57 // pointers must call the method below.
58 template <class T> void do_barrier(T* p);
59
60 // Version for use by closures that may be called in parallel code.
61 template <class T> void par_do_barrier(T* p);
62
63 public:
64 OopsInGenClosure() : ExtendedOopClosure(NULL),
65 _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
66
67 OopsInGenClosure(Generation* gen);
68
69 // Problem with static closures: must have _gen_boundary set at some point,
70 // but cannot do this until after the heap is initialized.
71 void set_generation(Generation* gen);
72 void assert_generation(Generation* gen);
73
74 HeapWord* gen_boundary() { return _gen_boundary; }
75 };
76
77 // Super class for scan closures. It contains code to dirty scanned Klasses.
78 class OopsInKlassOrGenClosure: public OopsInGenClosure {
79 Klass* _scanned_klass;
80 public:
81 OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {}
82 void set_scanned_klass(Klass* k) {
83 assert(k == NULL || _scanned_klass == NULL, "Must be");
84 _scanned_klass = k;
85 }
86 bool is_scanning_a_klass() { return _scanned_klass != NULL; }
87 void do_klass_barrier();
88 };
89
90 // Closure for scanning DefNewGeneration.
91 //
92 // This closure will perform barrier store calls for ALL
93 // pointers in scanned oops.
94 class ScanClosure: public OopsInKlassOrGenClosure {
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