Optimizing noSuchMethod invocation with no arguments.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 1126 matching lines @@
   // No such checking code is generated if only fixed parameters are declared,
   // unless we are in debug mode or unless we are compiling a closure.
   LocalVariable* saved_args_desc_var =
       parsed_function().GetSavedArgumentsDescriptorVar();
   if (num_copied_params == 0) {
 #ifdef DEBUG
     ASSERT(!parsed_function().function().HasOptionalParameters());
     const bool check_arguments = !flow_graph().IsCompiledForOsr();
 #else
     const bool check_arguments =
-        function.IsClosureFunction() && !flow_graph().IsCompiledForOsr();
+        (function.IsClosureFunction() || function.IsNoSuchMethodDispatcher()) &&
+        !flow_graph().IsCompiledForOsr();
 #endif
     if (check_arguments) {
       __ Comment("Check argument count");
       // Check that exactly num_fixed arguments are passed in.
       Label correct_num_arguments, wrong_num_arguments;
       __ movq(RAX, FieldAddress(R10, ArgumentsDescriptor::count_offset()));
       __ cmpq(RAX, Immediate(Smi::RawValue(num_fixed_params)));
       __ j(NOT_EQUAL, &wrong_num_arguments, Assembler::kNearJump);
       __ cmpq(RAX,
               FieldAddress(R10,
                            ArgumentsDescriptor::positional_count_offset()));
       __ j(EQUAL, &correct_num_arguments, Assembler::kNearJump);
 
       __ Bind(&wrong_num_arguments);
-      if (function.IsClosureFunction()) {
+      if (function.IsClosureFunction() || function.IsNoSuchMethodDispatcher()) {
         if (StackSize() != 0) {
           // We need to unwind the space we reserved for locals and copied
           // parameters. The NoSuchMethodFunction stub does not expect to see
           // that area on the stack.
           __ addq(RSP, Immediate(StackSize() * kWordSize));
         }
         // The call below has an empty stackmap because we have just
         // dropped the spill slots.
         BitmapBuilder* empty_stack_bitmap = new BitmapBuilder();
 
-        // Invoke noSuchMethod function passing "call" as the function name.
+        // Invoke noSuchMethod function passing the original function name.
+        // For closure functions, use "call" as the original name.
+        const String& name =
+            String::Handle(function.IsClosureFunction()
+                             ? Symbols::Call().raw()
+                             : function.name());
         const int kNumArgsChecked = 1;
         const ICData& ic_data = ICData::ZoneHandle(
-            ICData::New(function, Symbols::Call(),
-                        Isolate::kNoDeoptId, kNumArgsChecked));
+            ICData::New(function, name, Isolate::kNoDeoptId, kNumArgsChecked));
         __ LoadObject(RBX, ic_data);
         // RBP - 8 : PC marker, for easy identification of RawInstruction obj.
         // RBP : points to previous frame pointer.
         // RBP + 8 : points to return address.
         // RBP + 16 : address of last argument (arg n-1).
         // RSP + 16 + 8*(n-1) : address of first argument (arg 0).
         // RBX : ic-data.
         // R10 : arguments descriptor array.
         __ call(&StubCode::CallNoSuchMethodFunctionLabel());
         // Emit descriptors in order to provide correct postion in stacktrace.
@@ skipping 716 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ addq(RSP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64