Create and cache method extraction stub in the ICData.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2012, 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"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/assembler_macros.h"
 #include "vm/compiler.h"
@@ skipping 972 matching lines @@
   __ Bind(&L);
   // Setup frame, push callee-saved registers.
   __ EnterCallRuntimeFrame(0);
   __ movq(RDI, FieldAddress(CTX, Context::isolate_offset()));
   __ CallRuntime(kStoreBufferBlockProcessRuntimeEntry);
   __ LeaveCallRuntimeFrame();
   __ ret();
 }
 
 
+void StubCode::GenerateMethodExtractor(Assembler* assembler,
+                                       const Function& closure_function) {
+  const Immediate raw_null =
+      Immediate(reinterpret_cast<intptr_t>(Object::null()));
+
+  AssemblerMacros::EnterStubFrame(assembler);
+  __ movq(RAX, Address(RBP, 2 * kWordSize));
+  __ pushq(RAX);  // Push receiver.
+
+  __ LoadClass(R10, RAX);
+  // Compute instance type arguments into R13.
+  Label has_no_type_arguments;
+  __ movq(R13, raw_null);
+  __ movq(RDI, FieldAddress(R10,
+      Class::type_arguments_field_offset_in_words_offset()));
+  __ cmpq(RDI, Immediate(Class::kNoTypeArguments));
+  __ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump);
+  __ movq(R13, FieldAddress(RAX, RDI, TIMES_8, 0));
+  __ Bind(&has_no_type_arguments);
+  __ pushq(R13);  // Push type arguments.
+
+  const Code& stub = Code::Handle(
+      GetAllocationStubForClosure(
+          Function::ZoneHandle(closure_function.raw())));
+  const ExternalLabel label(closure_function.ToCString(), stub.EntryPoint());
+  __ call(&label);
+  __ Drop(2);  // Drop receiver and type arguments.
+  __ LeaveFrame();
+  __ ret();
+}
+
+
 // Called for inline allocation of objects.
 // Input parameters:
 //   RSP + 16 : type arguments object (only if class is parameterized).
 //   RSP + 8 : type arguments of instantiator (only if class is parameterized).
 //   RSP : points to return address.
 void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
                                               const Class& cls) {
   const intptr_t kObjectTypeArgumentsOffset = 2 * kWordSize;
   const intptr_t kInstantiatorTypeArgumentsOffset = 1 * kWordSize;
   const Immediate raw_null =
@@ skipping 1063 matching lines @@
   __ cmpq(left, right);
   __ Bind(&done);
   __ popq(right);
   __ popq(left);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64