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comparison src/share/vm/memory/universe.cpp @ 3852:fdb992d83a87

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7071653: JSR 292: call site change notification should be pushed not pulled Reviewed-by: kvn, never, bdelsart
author twisti
date Tue, 16 Aug 2011 04:14:05 -0700
parents 6747fd0512e0
children b27c72d69fd1
comparison
equal deleted inserted replaced
3851:95134e034042 3852:fdb992d83a87
1175 1175
1176 // CodeCache can only be updated by a thread_in_VM and they will all be 1176 // CodeCache can only be updated by a thread_in_VM and they will all be
1177 // stopped dring the safepoint so CodeCache will be safe to update without 1177 // stopped dring the safepoint so CodeCache will be safe to update without
1178 // holding the CodeCache_lock. 1178 // holding the CodeCache_lock.
1179 1179
1180 DepChange changes(dependee); 1180 KlassDepChange changes(dependee);
1181 1181
1182 // Compute the dependent nmethods 1182 // Compute the dependent nmethods
1183 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1183 if (CodeCache::mark_for_deoptimization(changes) > 0) {
1184 // At least one nmethod has been marked for deoptimization
1185 VM_Deoptimize op;
1186 VMThread::execute(&op);
1187 }
1188 }
1189
1190 // Flushes compiled methods dependent on a particular CallSite
1191 // instance when its target is different than the given MethodHandle.
1192 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) {
1193 assert_lock_strong(Compile_lock);
1194
1195 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1196
1197 // CodeCache can only be updated by a thread_in_VM and they will all be
1198 // stopped dring the safepoint so CodeCache will be safe to update without
1199 // holding the CodeCache_lock.
1200
1201 CallSiteDepChange changes(call_site(), method_handle());
1202
1203 // Compute the dependent nmethods that have a reference to a
1204 // CallSite object. We use instanceKlass::mark_dependent_nmethod
1205 // directly instead of CodeCache::mark_for_deoptimization because we
1206 // want dependents on the class CallSite only not all classes in the
1207 // ContextStream.
1208 int marked = 0;
1209 {
1210 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1211 instanceKlass* call_site_klass = instanceKlass::cast(SystemDictionary::CallSite_klass());
1212 marked = call_site_klass->mark_dependent_nmethods(changes);
1213 }
1214 if (marked > 0) {
1184 // At least one nmethod has been marked for deoptimization 1215 // At least one nmethod has been marked for deoptimization
1185 VM_Deoptimize op; 1216 VM_Deoptimize op;
1186 VMThread::execute(&op); 1217 VMThread::execute(&op);
1187 } 1218 }
1188 } 1219 }