Wed, 02 Jan 2013 20:28:09 -0500
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
Summary: Relocate functions with jsr's when rewriting so not repeated after reading shared archive
Reviewed-by: twisti, jrose
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25 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
28 #include "oops/instanceKlass.hpp"
30 // An InstanceRefKlass is a specialized InstanceKlass for Java
31 // classes that are subclasses of java/lang/ref/Reference.
32 //
33 // These classes are used to implement soft/weak/final/phantom
34 // references and finalization, and need special treatment by the
35 // garbage collector.
36 //
37 // During GC discovered reference objects are added (chained) to one
38 // of the four lists below, depending on the type of reference.
39 // The linked occurs through the next field in class java/lang/ref/Reference.
40 //
41 // Afterwards, the discovered references are processed in decreasing
42 // order of reachability. Reference objects eligible for notification
43 // are linked to the static pending_list in class java/lang/ref/Reference,
44 // and the pending list lock object in the same class is notified.
47 class InstanceRefKlass: public InstanceKlass {
48 friend class InstanceKlass;
50 // Constructor
51 InstanceRefKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)
52 : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
54 public:
55 InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
56 // Type testing
57 bool oop_is_instanceRef() const { return true; }
59 // Casting from Klass*
60 static InstanceRefKlass* cast(Klass* k) {
61 assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass");
62 return (InstanceRefKlass*) k;
63 }
65 // Garbage collection
66 int oop_adjust_pointers(oop obj);
67 void oop_follow_contents(oop obj);
69 // Parallel Scavenge and Parallel Old
70 PARALLEL_GC_DECLS
72 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
73 return oop_oop_iterate_v(obj, blk);
74 }
75 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
76 return oop_oop_iterate_v_m(obj, blk, mr);
77 }
79 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
80 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
81 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
83 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
84 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
86 #ifndef SERIALGC
87 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
88 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
90 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
91 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
92 #endif // !SERIALGC
94 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);
95 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);
96 static bool owns_pending_list_lock(JavaThread* thread);
98 // Update non-static oop maps so 'referent', 'nextPending' and
99 // 'discovered' will look like non-oops
100 static void update_nonstatic_oop_maps(Klass* k);
102 public:
103 // Verification
104 void oop_verify_on(oop obj, outputStream* st);
105 };
107 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP