Create and cache method extraction stub in the ICData.

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
diff --git a/runtime/vm/stub_code_ia32.cc b/runtime/vm/stub_code_ia32.cc
index efa7b9171a21538b5cf8a830e368ca1575c690d0..5a1ed20d669e9036799f9d1705c19f9611af31b4 100644
--- a/runtime/vm/stub_code_ia32.cc
+++ b/runtime/vm/stub_code_ia32.cc
@@ -1181,6 +1181,38 @@ void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
 }
 
 
+void StubCode::GenerateMethodExtractor(Assembler* assembler,
+                                       const Function& closure_function) {
+  const Immediate raw_null =
+      Immediate(reinterpret_cast<intptr_t>(Object::null()));
+
+  AssemblerMacros::EnterStubFrame(assembler);
+  __ movl(EAX, Address(EBP, 2 * kWordSize));
+  __ pushl(EAX);  // Push receiver.
+
+  __ LoadClass(ECX, EAX, EBX);
+  // Compute instance type arguments into EBX.
+  Label has_no_type_arguments;
+  __ movl(EBX, raw_null);
+  __ movl(EDI, FieldAddress(ECX,
+      Class::type_arguments_field_offset_in_words_offset()));
+  __ cmpl(EDI, Immediate(Class::kNoTypeArguments));
+  __ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump);
+  __ movl(EBX, FieldAddress(EAX, EDI, TIMES_4, 0));
+  __ Bind(&has_no_type_arguments);
+  __ pushl(EBX);  // 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 closures.
 // Input parameters:
 //   ESP + 8 : receiver (null if not an implicit instance closure).