Fri, 15 Apr 2011 09:36:28 -0400
7032407: Crash in LinkResolver::runtime_resolve_virtual_method()
Summary: Make CDS reorder vtables so that dump time vtables match run time order, so when redefine classes reinitializes them, they aren't in the wrong order.
Reviewed-by: dcubed, acorn
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25 #ifndef SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP
26 #define SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP
28 #include "memory/cardTableRS.hpp"
29 #include "memory/defNewGeneration.hpp"
30 #include "memory/genCollectedHeap.hpp"
31 #include "memory/genOopClosures.hpp"
32 #include "memory/genRemSet.hpp"
33 #include "memory/generation.hpp"
34 #include "memory/sharedHeap.hpp"
35 #include "memory/space.hpp"
37 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :
38 OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
39 set_generation(gen);
40 }
42 inline void OopsInGenClosure::set_generation(Generation* gen) {
43 _gen = gen;
44 _gen_boundary = _gen->reserved().start();
45 // Barrier set for the heap, must be set after heap is initialized
46 if (_rs == NULL) {
47 GenRemSet* rs = SharedHeap::heap()->rem_set();
48 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind");
49 _rs = (CardTableRS*)rs;
50 }
51 }
53 template <class T> inline void OopsInGenClosure::do_barrier(T* p) {
54 assert(generation()->is_in_reserved(p), "expected ref in generation");
55 T heap_oop = oopDesc::load_heap_oop(p);
56 assert(!oopDesc::is_null(heap_oop), "expected non-null oop");
57 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
58 // If p points to a younger generation, mark the card.
59 if ((HeapWord*)obj < _gen_boundary) {
60 _rs->inline_write_ref_field_gc(p, obj);
61 }
62 }
64 template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) {
65 assert(generation()->is_in_reserved(p), "expected ref in generation");
66 T heap_oop = oopDesc::load_heap_oop(p);
67 assert(!oopDesc::is_null(heap_oop), "expected non-null oop");
68 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
69 // If p points to a younger generation, mark the card.
70 if ((HeapWord*)obj < gen_boundary()) {
71 rs()->write_ref_field_gc_par(p, obj);
72 }
73 }
75 // NOTE! Any changes made here should also be made
76 // in FastScanClosure::do_oop_work()
77 template <class T> inline void ScanClosure::do_oop_work(T* p) {
78 T heap_oop = oopDesc::load_heap_oop(p);
79 // Should we copy the obj?
80 if (!oopDesc::is_null(heap_oop)) {
81 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
82 if ((HeapWord*)obj < _boundary) {
83 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
84 oop new_obj = obj->is_forwarded() ? obj->forwardee()
85 : _g->copy_to_survivor_space(obj);
86 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
87 }
88 if (_gc_barrier) {
89 // Now call parent closure
90 do_barrier(p);
91 }
92 }
93 }
95 inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); }
96 inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); }
98 // NOTE! Any changes made here should also be made
99 // in ScanClosure::do_oop_work()
100 template <class T> inline void FastScanClosure::do_oop_work(T* p) {
101 T heap_oop = oopDesc::load_heap_oop(p);
102 // Should we copy the obj?
103 if (!oopDesc::is_null(heap_oop)) {
104 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
105 if ((HeapWord*)obj < _boundary) {
106 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
107 oop new_obj = obj->is_forwarded() ? obj->forwardee()
108 : _g->copy_to_survivor_space(obj);
109 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
110 if (_gc_barrier) {
111 // Now call parent closure
112 do_barrier(p);
113 }
114 }
115 }
116 }
118 inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); }
119 inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); }
121 // Note similarity to ScanClosure; the difference is that
122 // the barrier set is taken care of outside this closure.
123 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
124 assert(!oopDesc::is_null(*p), "null weak reference?");
125 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
126 // weak references are sometimes scanned twice; must check
127 // that to-space doesn't already contain this object
128 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
129 oop new_obj = obj->is_forwarded() ? obj->forwardee()
130 : _g->copy_to_survivor_space(obj);
131 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
132 }
133 }
135 inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); }
136 inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }
138 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP