AOT: Add a separate switchable call state for unlinked calls.

runtime/vm/stub_code_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"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 2149 matching lines @@
   __ jmp(RCX);
 
   __ Bind(&miss);
   __ LoadIsolate(RAX);
   __ movq(CODE_REG, Address(RAX, Isolate::ic_miss_code_offset()));
   __ movq(RCX, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ jmp(RCX);
 }
 
 
+//  RDI: receiver
+//  RBX: UnlinkedCall
+void StubCode::GenerateUnlinkedCallStub(Assembler* assembler) {
+  __ NoMonomorphicCheckedEntry();
+
+  __ EnterStubFrame();
+  __ pushq(RDI);  // Preserve receiver.
+
+  __ PushObject(Object::null_object());  // Result.
+  __ pushq(RDI);                         // Arg0: Receiver
+  __ pushq(RBX);                         // Arg1: UnlinkedCall
+  __ CallRuntime(kUnlinkedCallRuntimeEntry, 2);
+  __ popq(RBX);
+  __ popq(RBX);
+  __ popq(RBX);  // result = IC
+
+  __ popq(RDI);  // Restore receiver.
+  __ LeaveStubFrame();
+
+  __ movq(CODE_REG, Address(THR, Thread::ic_lookup_through_code_stub_offset()));
+  __ movq(RCX, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
+  __ jmp(RCX);
+}
+
+
 // Called from switchable IC calls.
 //  RDI: receiver
 //  RBX: SingleTargetCache
 // Passed to target::
 //  CODE_REG: target Code object
 void StubCode::GenerateSingleTargetCallStub(Assembler* assembler) {
   __ NoMonomorphicCheckedEntry();
 
   Label miss;
   __ LoadClassIdMayBeSmi(RAX, RDI);
@@ skipping 47 matching lines @@
 }
 
 
 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64