Decode ic data and arguments descriptor passed in calls on ARM.

runtime/vm/code_patcher_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/code_patcher.h"
 
 #include "vm/instructions.h"
@@ skipping 15 matching lines @@
   ASSERT(code.ContainsInstructionAt(return_address));
   CallPattern call(return_address, code);
   call.SetTargetAddress(new_target);
 }
 
 
 void CodePatcher::PatchInstanceCallAt(uword return_address,
                                       const Code& code,
                                       uword new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
-  UNIMPLEMENTED();
+  CallPattern call(return_address, code);
+  call.SetTargetAddress(new_target);
 }
 
 
 void CodePatcher::InsertCallAt(uword start, uword target) {
   UNIMPLEMENTED();
 }
 
 
 uword CodePatcher::GetInstanceCallAt(uword return_address,
                                      const Code& code,
                                      ICData* ic_data,
                                      Array* arguments_descriptor) {
   ASSERT(code.ContainsInstructionAt(return_address));
-  UNIMPLEMENTED();
-  return 0;
+  CallPattern call(return_address, code);
+  if (ic_data != NULL) {
+    *ic_data = call.IcData();
+  }
+  if (arguments_descriptor != NULL) {
+    *arguments_descriptor = call.ArgumentsDescriptor();
+  }
+  return call.TargetAddress();
 }
 
 
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
-  UNIMPLEMENTED();
+  // The instance call instruction sequence has a variable size on ARM.
+  UNREACHABLE();
   return 0;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM