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comparison src/share/vm/memory/compactingPermGenGen.cpp @ 113:ba764ed4b6f2

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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author coleenp
date Sun, 13 Apr 2008 17:43:42 -0400
parents 2c106685d6d0
children d1605aabd0a1
comparison
equal deleted inserted replaced
110:a49a647afe9a 113:ba764ed4b6f2
47 // An OopClosure helper: Recursively adjust all pointers in an object 47 // An OopClosure helper: Recursively adjust all pointers in an object
48 // and all objects by referenced it. Clear marks on objects in order 48 // and all objects by referenced it. Clear marks on objects in order
49 // to prevent visiting any object twice. 49 // to prevent visiting any object twice.
50 50
51 class RecursiveAdjustSharedObjectClosure : public OopClosure { 51 class RecursiveAdjustSharedObjectClosure : public OopClosure {
52 public: 52 protected:
53 void do_oop(oop* o) { 53 template <class T> inline void do_oop_work(T* p) {
54 oop obj = *o; 54 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
55 if (obj->is_shared_readwrite()) { 55 if (obj->is_shared_readwrite()) {
56 if (obj->mark()->is_marked()) { 56 if (obj->mark()->is_marked()) {
57 obj->init_mark(); // Don't revisit this object. 57 obj->init_mark(); // Don't revisit this object.
58 obj->oop_iterate(this); // Recurse - adjust objects referenced. 58 obj->oop_iterate(this); // Recurse - adjust objects referenced.
59 obj->adjust_pointers(); // Adjust this object's references. 59 obj->adjust_pointers(); // Adjust this object's references.
69 cp->oop_iterate(this); 69 cp->oop_iterate(this);
70 } 70 }
71 } 71 }
72 } 72 }
73 } 73 }
74 }; 74 }
75 public:
76 virtual void do_oop(oop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); }
77 virtual void do_oop(narrowOop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); }
75 }; 78 };
76 79
77 80
78 // We need to go through all placeholders in the system dictionary and 81 // We need to go through all placeholders in the system dictionary and
79 // try to resolve them into shared classes. Other threads might be in 82 // try to resolve them into shared classes. Other threads might be in
84 // RecursiveAdjustSharedObjectClosure to the SystemDictionary. Note 87 // RecursiveAdjustSharedObjectClosure to the SystemDictionary. Note
85 // that we must not call find_shared_class with non-read-only symbols 88 // that we must not call find_shared_class with non-read-only symbols
86 // as doing so can cause hash codes to be computed, destroying 89 // as doing so can cause hash codes to be computed, destroying
87 // forwarding pointers. 90 // forwarding pointers.
88 class TraversePlaceholdersClosure : public OopClosure { 91 class TraversePlaceholdersClosure : public OopClosure {
89 public: 92 protected:
90 void do_oop(oop* o) { 93 template <class T> inline void do_oop_work(T* p) {
91 oop obj = *o; 94 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
92 if (obj->klass() == Universe::symbolKlassObj() && 95 if (obj->klass() == Universe::symbolKlassObj() &&
93 obj->is_shared_readonly()) { 96 obj->is_shared_readonly()) {
94 symbolHandle sym((symbolOop) obj); 97 symbolHandle sym((symbolOop) obj);
95 oop k = SystemDictionary::find_shared_class(sym); 98 oop k = SystemDictionary::find_shared_class(sym);
96 if (k != NULL) { 99 if (k != NULL) {
97 RecursiveAdjustSharedObjectClosure clo; 100 RecursiveAdjustSharedObjectClosure clo;
98 clo.do_oop(&k); 101 clo.do_oop(&k);
99 } 102 }
100 } 103 }
101 } 104 }
105 public:
106 virtual void do_oop(oop* p) { TraversePlaceholdersClosure::do_oop_work(p); }
107 virtual void do_oop(narrowOop* p) { TraversePlaceholdersClosure::do_oop_work(p); }
108
102 }; 109 };
103 110
104 111
105 void CompactingPermGenGen::initialize_performance_counters() { 112 void CompactingPermGenGen::initialize_performance_counters() {
106 113