Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/code_patcher_dbc.cc

 // Copyright (c) 2016, 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_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/code_patcher.h"
 
 #include "vm/flow_graph_compiler.h"
@@ skipping 50 matching lines @@
   ICData& ic_data = ICData::Handle();
   ic_data ^= static_call.IcData();
   if (ic_data_result != NULL) {
     *ic_data_result = ic_data.raw();
   }
   return ic_data.GetTargetAt(0);
 }
 
 
 void CodePatcher::PatchSwitchableCallAt(uword return_address,
-                                        const Code& code,
-                                        const ICData& ic_data,
-                                        const MegamorphicCache& cache,
-                                        const Code& lookup_stub) {
-  ASSERT(code.ContainsInstructionAt(return_address));
-  SwitchableCallPattern call(return_address, code);
-  ASSERT(call.cache() == ic_data.raw());
-  call.SetLookupStub(lookup_stub);
-  call.SetCache(cache);
+                                        const Code& caller_code,
+                                        const Object& data,
+                                        const Code& target) {
+  ASSERT(caller_code.ContainsInstructionAt(return_address));
+  SwitchableCallPattern call(return_address, caller_code);
+  call.SetData(data);
+  call.SetTarget(target);
 }
 
 
+RawCode* CodePatcher::GetSwitchableCallTargetAt(uword return_address,
+                                                const Code& caller_code) {
+  ASSERT(caller_code.ContainsInstructionAt(return_address));
+  SwitchableCallPattern call(return_address, caller_code);
+  return call.target();
+}
+
+
+RawObject* CodePatcher::GetSwitchableCallDataAt(uword return_address,
+                                                const Code& caller_code) {
+  ASSERT(caller_code.ContainsInstructionAt(return_address));
+  SwitchableCallPattern call(return_address, caller_code);
+  return call.data();
+}
+
+
 void CodePatcher::PatchNativeCallAt(uword return_address,
                                     const Code& code,
                                     NativeFunction target,
                                     const Code& trampoline) {
   ASSERT(code.ContainsInstructionAt(return_address));
   NativeCallPattern call(return_address, code);
   call.set_target(trampoline);
   call.set_native_function(target);
 }
 
 
 RawCode* CodePatcher::GetNativeCallAt(uword return_address,
                                      const Code& code,
                                      NativeFunction* target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   NativeCallPattern call(return_address, code);
   *target = call.native_function();
   return call.target();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC