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8073705: more performance issues in class redefinition

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Optimize the method pointer adjustments for prev klass versions and MNT

Reviewed-by: dcubed, coleenp
This commit is contained in:
Serguei Spitsyn 2015-04-27 19:51:00 -07:00
parent 8cb760c280
commit f7c143cbb2
7 changed files with 36 additions and 94 deletions
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38
hotspot/src/share/vm/oops/cpCache.cpp
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@ -604,44 +604,6 @@ void ConstantPoolCache::initialize(const intArray& inverse_index_map,
#if INCLUDE_JVMTI
// RedefineClasses() API support:
// If any entry of this ConstantPoolCache points to any of
// old_methods, replace it with the corresponding new_method.
void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods,
int methods_length, bool * trace_name_printed) {
if (methods_length == 0) {
// nothing to do if there are no methods
return;
}
// get shorthand for the interesting class
Klass* old_holder = old_methods[0]->method_holder();
for (int i = 0; i < length(); i++) {
if (entry_at(i)->get_interesting_method_entry(old_holder) == NULL) {
// skip uninteresting methods
continue;
}
// The ConstantPoolCache contains entries for several different
// things, but we only care about methods. In fact, we only care
// about methods in the same class as the one that contains the
// old_methods. At this point, we have an interesting entry.
for (int j = 0; j < methods_length; j++) {
Method* old_method = old_methods[j];
Method* new_method = new_methods[j];
if (entry_at(i)->adjust_method_entry(old_method, new_method,
trace_name_printed)) {
// current old_method matched this entry and we updated it so
// break out and get to the next interesting entry if there one
break;
}
}
}
}
// If any entry of this ConstantPoolCache points to any of
// old_methods, replace it with the corresponding new_method.
void ConstantPoolCache::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {