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src/hotspot/share/oops/klassVtable.cpp

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1213                        method_holder->class_in_module_of_loader(false, true));
1214             THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
1215           }
1216         }
1217       }
1218     }
1219     ime++;
1220   }
1221 }
1222 
1223 void klassItable::initialize_itable_and_check_constraints(TRAPS) {
1224   // Save a super interface from each itable entry to do constraint checking
1225   ResourceMark rm(THREAD);
1226   GrowableArray<Method*>* supers =
1227     new GrowableArray<Method*>(_size_method_table, _size_method_table, nullptr);
1228   initialize_itable(supers);
1229   check_constraints(supers, CHECK);
1230 }
1231 
1232 inline bool interface_method_needs_itable_index(Method* m) {
1233   if (m->is_static())             return false; // e.g., Stream.empty
1234   if (m->is_object_initializer()) return false; // <init>
1235   if (m->is_static_initializer()) return false; // <clinit>
1236   if (m->is_private())            return false; // uses direct call
1237   // If an interface redeclares a method from java.lang.Object,
1238   // it should already have a vtable index, don't touch it.
1239   // e.g., CharSequence.toString (from initialize_vtable)
1240   // if (m->has_vtable_index())  return false; // NO!
1241   return true;
1242 }
1243 
1244 int klassItable::assign_itable_indices_for_interface(InstanceKlass* klass) {
1245   // an interface does not have an itable, but its methods need to be numbered
1246   if (log_develop_is_enabled(Trace, itables)) {
1247     ResourceMark rm;
1248     log_develop_debug(itables)("%3d: Initializing itable indices for interface %s",
1249                                ++initialize_count, klass->name()->as_C_string());
1250   }
1251 
1252   Array<Method*>* methods = klass->methods();
1253   int nof_methods = methods->length();
1254   int ime_num = 0;
1255   for (int i = 0; i < nof_methods; i++) {
1256     Method* m = methods->at(i);

1423       tty->print("      (%5d)  ", i);
1424       m->access_flags().print_on(tty);
1425       if (m->is_default_method()) {
1426         tty->print("default ");
1427       }
1428       tty->print(" --  ");
1429       m->print_name(tty);
1430       tty->cr();
1431     }
1432     ime++;
1433   }
1434 }
1435 #endif // INCLUDE_JVMTI
1436 
1437 // Setup
1438 class InterfaceVisiterClosure : public StackObj {
1439  public:
1440   virtual void doit(InstanceKlass* intf, int method_count) = 0;
1441 };
1442 












1443 // Visit all interfaces with at least one itable method
1444 static void visit_all_interfaces(Array<InstanceKlass*>* transitive_intf, InterfaceVisiterClosure *blk) {
1445   // Handle array argument
1446   for(int i = 0; i < transitive_intf->length(); i++) {
1447     InstanceKlass* intf = transitive_intf->at(i);
1448     assert(intf->is_interface(), "sanity check");
1449 
1450     // Find no. of itable methods
1451     int method_count = 0;
1452     // method_count = klassItable::method_count_for_interface(intf);
1453     Array<Method*>* methods = intf->methods();
1454     if (methods->length() > 0) {
1455       for (int i = methods->length(); --i >= 0; ) {
1456         if (interface_method_needs_itable_index(methods->at(i))) {
1457           method_count++;
1458         }
1459       }
1460     }
1461 
1462     // Visit all interfaces which either have any methods or can participate in receiver type check.

1213                        method_holder->class_in_module_of_loader(false, true));
1214             THROW_MSG(vmSymbols::java_lang_LinkageError(), ss.as_string());
1215           }
1216         }
1217       }
1218     }
1219     ime++;
1220   }
1221 }
1222 
1223 void klassItable::initialize_itable_and_check_constraints(TRAPS) {
1224   // Save a super interface from each itable entry to do constraint checking
1225   ResourceMark rm(THREAD);
1226   GrowableArray<Method*>* supers =
1227     new GrowableArray<Method*>(_size_method_table, _size_method_table, nullptr);
1228   initialize_itable(supers);
1229   check_constraints(supers, CHECK);
1230 }
1231 
1232 inline bool interface_method_needs_itable_index(Method* m) {
1233   if (m->is_static())             return false;   // e.g., Stream.empty
1234   if (m->is_private())            return false;   // uses direct call
1235   if (m->is_object_constructor()) return false;   // <init>(...)V
1236   if (m->is_class_initializer())  return false;   // <clinit>()V
1237   // If an interface redeclares a method from java.lang.Object,
1238   // it should already have a vtable index, don't touch it.
1239   // e.g., CharSequence.toString (from initialize_vtable)
1240   // if (m->has_vtable_index())  return false; // NO!
1241   return true;
1242 }
1243 
1244 int klassItable::assign_itable_indices_for_interface(InstanceKlass* klass) {
1245   // an interface does not have an itable, but its methods need to be numbered
1246   if (log_develop_is_enabled(Trace, itables)) {
1247     ResourceMark rm;
1248     log_develop_debug(itables)("%3d: Initializing itable indices for interface %s",
1249                                ++initialize_count, klass->name()->as_C_string());
1250   }
1251 
1252   Array<Method*>* methods = klass->methods();
1253   int nof_methods = methods->length();
1254   int ime_num = 0;
1255   for (int i = 0; i < nof_methods; i++) {
1256     Method* m = methods->at(i);

1423       tty->print("      (%5d)  ", i);
1424       m->access_flags().print_on(tty);
1425       if (m->is_default_method()) {
1426         tty->print("default ");
1427       }
1428       tty->print(" --  ");
1429       m->print_name(tty);
1430       tty->cr();
1431     }
1432     ime++;
1433   }
1434 }
1435 #endif // INCLUDE_JVMTI
1436 
1437 // Setup
1438 class InterfaceVisiterClosure : public StackObj {
1439  public:
1440   virtual void doit(InstanceKlass* intf, int method_count) = 0;
1441 };
1442 
1443 int count_interface_methods_needing_itable_index(Array<Method*>* methods) {
1444   int method_count = 0;
1445   if (methods->length() > 0) {
1446     for (int i = methods->length(); --i >= 0; ) {
1447       if (interface_method_needs_itable_index(methods->at(i))) {
1448         method_count++;
1449       }
1450     }
1451   }
1452   return method_count;
1453 }
1454 
1455 // Visit all interfaces with at least one itable method
1456 static void visit_all_interfaces(Array<InstanceKlass*>* transitive_intf, InterfaceVisiterClosure *blk) {
1457   // Handle array argument
1458   for(int i = 0; i < transitive_intf->length(); i++) {
1459     InstanceKlass* intf = transitive_intf->at(i);
1460     assert(intf->is_interface(), "sanity check");
1461 
1462     // Find no. of itable methods
1463     int method_count = 0;
1464     // method_count = klassItable::method_count_for_interface(intf);
1465     Array<Method*>* methods = intf->methods();
1466     if (methods->length() > 0) {
1467       for (int i = methods->length(); --i >= 0; ) {
1468         if (interface_method_needs_itable_index(methods->at(i))) {
1469           method_count++;
1470         }
1471       }
1472     }
1473 
1474     // Visit all interfaces which either have any methods or can participate in receiver type check.
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