Optimizing noSuchMethod invocation with no arguments.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
===================================================================
--- runtime/vm/code_generator.cc	(revision 24189)
+++ runtime/vm/code_generator.cc	(working copy)
@@ -881,8 +881,9 @@
     // Let the megamorphic stub handle special cases: NoSuchMethod,
     // closure calls.
     if (FLAG_trace_ic) {
-      OS::PrintErr("InlineCacheMissHandler NULL code for receiver: %s\n",
-          receiver.ToCString());
+      OS::PrintErr("InlineCacheMissHandler NULL code for %s receiver: %s\n",
+                   String::Handle(ic_data.target_name()).ToCString(),
+                   receiver.ToCString());
     }
     return Function::null();
   }
@@ -1157,7 +1158,9 @@
                                                getter_name,
                                                kNumArguments,
                                                kNumNamedArguments));
-  if (getter.IsNull() || getter.IsMethodExtractor()) {
+  if (getter.IsNull() ||
+      getter.IsMethodExtractor() ||
+      getter.IsNoSuchMethodDispatcher()) {
     return false;
   }
 
@@ -1182,6 +1185,41 @@
 }
 
 
+// Create a method for noSuchMethod invocation and attach it to the receiver
+// class.
+static RawFunction* CreateNoSuchMethodDispatcher(
+    const String& target_name,
+    const Class& receiver_class,
+    const Array& arguments_descriptor) {
+  Function& invocation = Function::Handle(
+      Function::New(String::Handle(Symbols::New(target_name)),
+                    RawFunction::kNoSuchMethodDispatcher,
+                    false,  // Not static.
+                    false,  // Not const.
+                    false,  // Not abstract.
+                    false,  // Not external.
+                    receiver_class,
+                    0));  // No token position.
+
+  // Initialize signature: receiver is a single fixed parameter.
+  const intptr_t kNumParameters = 1;
+  invocation.set_num_fixed_parameters(kNumParameters);
+  invocation.SetNumOptionalParameters(0, 0);
+  invocation.set_parameter_types(Array::Handle(Array::New(kNumParameters,
+                                                         Heap::kOld)));
+  invocation.set_parameter_names(Array::Handle(Array::New(kNumParameters,
+                                                         Heap::kOld)));
+  invocation.SetParameterTypeAt(0, Type::Handle(Type::DynamicType()));
+  invocation.SetParameterNameAt(0, Symbols::This());
+  invocation.set_result_type(Type::Handle(Type::DynamicType()));
+  invocation.set_is_visible(false);  // Not visible in stack trace.
+
+  receiver_class.AddFunction(invocation);
+
+  return invocation.raw();
+}
+
+
 // The IC miss handler has failed to find a (cacheable) instance function to
 // invoke.  Handle three possibilities:
 //
@@ -1216,10 +1254,32 @@
                                 args_descriptor,
                                 args,
                                 &result)) {
-    result = DartEntry::InvokeNoSuchMethod(receiver,
-                                           target_name,
-                                           args,
-                                           args_descriptor);
+    ArgumentsDescriptor desc(args_descriptor);
+    // TODO(fschneider): Handle multiple arguments.
+    if ((desc.Count() == 1) && (desc.PositionalCount() == 1)) {
+      // Create Function for noSuchMethodInvocation and add it to the class.
+      Function& target_function = Function::Handle();
+      target_function ^= CreateNoSuchMethodDispatcher(target_name,
+                                                      receiver_class,
+                                                      args_descriptor);
+
+      // Update IC data.
+      ASSERT(!target_function.IsNull());
+      ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
+      if (FLAG_trace_ic) {
+        OS::PrintErr("NoSuchMethod IC miss: adding <%s> id:%"Pd" -> <%s>\n",
+            Class::Handle(receiver.clazz()).ToCString(),
+            receiver.GetClassId(),
+            target_function.ToCString());
+      }
+      result =
+          DartEntry::InvokeFunction(target_function, args, args_descriptor);
+    } else {
+      result = DartEntry::InvokeNoSuchMethod(receiver,
+                                             target_name,
+                                             args,
+                                             args_descriptor);
+    }
   }
   CheckResultError(result);
   arguments.SetReturn(result);