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6497639: 4/3 Profiling Swing application caused JVM crash

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Make RedefineClasses() interoperate better with class sharing.

Reviewed-by: sspitsyn, jmasa
This commit is contained in:
Daniel D. Daugherty 2008-03-12 18:06:50 -07:00
parent 493ac9ee8f
commit 0f1d30354a
4 changed files with 87 additions and 27 deletions
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17
hotspot/src/share/vm/oops/instanceKlass.hpp
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@ -838,11 +838,20 @@ class BreakpointInfo;
// A collection point for interesting information about the previous
// version(s) of an instanceKlass. This class uses weak references to
// the information so that the information may be collected as needed
// by the system. A GrowableArray of PreviousVersionNodes is attached
// by the system. If the information is shared, then a regular
// reference must be used because a weak reference would be seen as
// collectible. A GrowableArray of PreviousVersionNodes is attached
// to the instanceKlass as needed. See PreviousVersionWalker below.
class PreviousVersionNode : public CHeapObj {
private:
jweak _prev_constant_pool;
// A shared ConstantPool is never collected so we'll always have
// a reference to it so we can update items in the cache. We'll
// have a weak reference to a non-shared ConstantPool until all
// of the methods (EMCP or obsolete) have been collected; the
// non-shared ConstantPool becomes collectible at that point.
jobject _prev_constant_pool; // regular or weak reference
bool _prev_cp_is_weak; // true if not a shared ConstantPool
// If the previous version of the instanceKlass doesn't have any
// EMCP methods, then _prev_EMCP_methods will be NULL. If all the
// EMCP methods have been collected, then _prev_EMCP_methods can
@ -850,10 +859,10 @@ class PreviousVersionNode : public CHeapObj {
GrowableArray<jweak>* _prev_EMCP_methods;
public:
PreviousVersionNode(jweak prev_constant_pool,
PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
GrowableArray<jweak>* prev_EMCP_methods);
~PreviousVersionNode();
jweak prev_constant_pool() const {
jobject prev_constant_pool() const {
return _prev_constant_pool;
}
GrowableArray<jweak>* prev_EMCP_methods() const {