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comparison src/share/vm/oops/instanceKlass.hpp @ 47:2c106685d6d0

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6497639: 4/3 Profiling Swing application caused JVM crash Summary: Make RedefineClasses() interoperate better with class sharing. Reviewed-by: sspitsyn, jmasa
author dcubed
date Wed, 12 Mar 2008 18:06:50 -0700
parents a61af66fc99e
children 31000d79ec71
comparison
equal deleted inserted replaced
2:7836be3e92d0 47:2c106685d6d0
836 836
837 837
838 // A collection point for interesting information about the previous 838 // A collection point for interesting information about the previous
839 // version(s) of an instanceKlass. This class uses weak references to 839 // version(s) of an instanceKlass. This class uses weak references to
840 // the information so that the information may be collected as needed 840 // the information so that the information may be collected as needed
841 // by the system. A GrowableArray of PreviousVersionNodes is attached 841 // by the system. If the information is shared, then a regular
842 // reference must be used because a weak reference would be seen as
843 // collectible. A GrowableArray of PreviousVersionNodes is attached
842 // to the instanceKlass as needed. See PreviousVersionWalker below. 844 // to the instanceKlass as needed. See PreviousVersionWalker below.
843 class PreviousVersionNode : public CHeapObj { 845 class PreviousVersionNode : public CHeapObj {
844 private: 846 private:
845 jweak _prev_constant_pool; 847 // A shared ConstantPool is never collected so we'll always have
848 // a reference to it so we can update items in the cache. We'll
849 // have a weak reference to a non-shared ConstantPool until all
850 // of the methods (EMCP or obsolete) have been collected; the
851 // non-shared ConstantPool becomes collectible at that point.
852 jobject _prev_constant_pool; // regular or weak reference
853 bool _prev_cp_is_weak; // true if not a shared ConstantPool
854
846 // If the previous version of the instanceKlass doesn't have any 855 // If the previous version of the instanceKlass doesn't have any
847 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 856 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
848 // EMCP methods have been collected, then _prev_EMCP_methods can 857 // EMCP methods have been collected, then _prev_EMCP_methods can
849 // have a length of zero. 858 // have a length of zero.
850 GrowableArray<jweak>* _prev_EMCP_methods; 859 GrowableArray<jweak>* _prev_EMCP_methods;
851 860
852 public: 861 public:
853 PreviousVersionNode(jweak prev_constant_pool, 862 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
854 GrowableArray<jweak>* prev_EMCP_methods); 863 GrowableArray<jweak>* prev_EMCP_methods);
855 ~PreviousVersionNode(); 864 ~PreviousVersionNode();
856 jweak prev_constant_pool() const { 865 jobject prev_constant_pool() const {
857 return _prev_constant_pool; 866 return _prev_constant_pool;
858 } 867 }
859 GrowableArray<jweak>* prev_EMCP_methods() const { 868 GrowableArray<jweak>* prev_EMCP_methods() const {
860 return _prev_EMCP_methods; 869 return _prev_EMCP_methods;
861 } 870 }