--- old/src/hotspot/share/runtime/javaCalls.cpp	2018-05-15 20:58:01.334636635 -0700
+++ new/src/hotspot/share/runtime/javaCalls.cpp	2018-05-15 20:57:59.054550009 -0700
@@ -199,13 +199,13 @@
 
 
 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
-  JavaCallArguments args(receiver); // One oop argument
+  JavaCallArguments args(receiver);
   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 }
 
 
 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
-  JavaCallArguments args(receiver); // One oop argument
+  JavaCallArguments args(receiver);
   args.push_oop(arg1);
   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 }
@@ -213,7 +213,7 @@
 
 
 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
-  JavaCallArguments args(receiver); // One oop argument
+  JavaCallArguments args(receiver);
   args.push_oop(arg1);
   args.push_oop(arg2);
   call_virtual(result, spec_klass, name, signature, &args, CHECK);
@@ -235,20 +235,20 @@
 
 
 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
-  JavaCallArguments args(receiver); // One oop argument
+  JavaCallArguments args(receiver);
   call_special(result, klass, name, signature, &args, CHECK);
 }
 
 
 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
-  JavaCallArguments args(receiver); // One oop argument
+  JavaCallArguments args(receiver);
   args.push_oop(arg1);
   call_special(result, klass, name, signature, &args, CHECK);
 }
 
 
 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
-  JavaCallArguments args(receiver); // One oop argument
+  JavaCallArguments args(receiver);
   args.push_oop(arg1);
   args.push_oop(arg2);
   call_special(result, klass, name, signature, &args, CHECK);
@@ -270,19 +270,19 @@
 
 
 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
-  JavaCallArguments args; // No argument
+  JavaCallArguments args;
   call_static(result, klass, name, signature, &args, CHECK);
 }
 
 
 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
-  JavaCallArguments args(arg1); // One oop argument
+  JavaCallArguments args(arg1);
   call_static(result, klass, name, signature, &args, CHECK);
 }
 
 
 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
-  JavaCallArguments args; // One oop argument
+  JavaCallArguments args;
   args.push_oop(arg1);
   args.push_oop(arg2);
   call_static(result, klass, name, signature, &args, CHECK);
@@ -290,13 +290,44 @@
 
 
 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) {
-  JavaCallArguments args; // One oop argument
+  JavaCallArguments args;
   args.push_oop(arg1);
   args.push_oop(arg2);
   args.push_oop(arg3);
   call_static(result, klass, name, signature, &args, CHECK);
 }
 
+// ============ allocate and initialize new object instance ============
+
+Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, JavaCallArguments* args, TRAPS) {
+  klass->initialize(CHECK_NH); // Quick no-op if already initialized.
+  Handle obj = klass->allocate_instance_handle(CHECK_NH);
+  JavaValue void_result(T_VOID);
+  args->set_receiver(obj); // inserts <obj> as the first argument.
+  JavaCalls::call_special(&void_result, klass,
+                          vmSymbols::object_initializer_name(),
+                          constructor_signature, args, CHECK_NH);
+  return obj;
+}
+
+Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
+  JavaCallArguments args;
+  return JavaCalls::construct_new_instance(klass, constructor_signature, &args, CHECK_NH);
+}
+
+Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, TRAPS) {
+  JavaCallArguments args;
+  args.push_oop(arg1);
+  return JavaCalls::construct_new_instance(klass, constructor_signature, &args, CHECK_NH);
+}
+
+Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
+  JavaCallArguments args;
+  args.push_oop(arg1);
+  args.push_oop(arg2);
+  return JavaCalls::construct_new_instance(klass, constructor_signature, &args, CHECK_NH);
+}
+
 // -------------------------------------------------
 // Implementation of JavaCalls (low level)