diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index dae1566..d5cba50 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -30,7 +30,6 @@
 #include "gc/space/space-inl.h"
 #include "handle_scope.h"
 #include "jdwp/object_registry.h"
-#include "method_helper-inl.h"
 #include "mirror/art_field-inl.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/class.h"
@@ -3678,7 +3677,7 @@
 
     {
       StackHandleScope<3> hs(soa.Self());
-      MethodHelper mh(hs.NewHandle(m));
+      HandleWrapper<mirror::ArtMethod> h_m(hs.NewHandleWrapper(&m));
       HandleWrapper<mirror::Object> h_obj(hs.NewHandleWrapper(&receiver));
       HandleWrapper<mirror::Class> h_klass(hs.NewHandleWrapper(&c));
       const DexFile::TypeList* types = m->GetParameterTypeList();
@@ -3689,7 +3688,8 @@
 
         if (shorty[i + 1] == 'L') {
           // Did we really get an argument of an appropriate reference type?
-          mirror::Class* parameter_type = mh.GetClassFromTypeIdx(types->GetTypeItem(i).type_idx_);
+          mirror::Class* parameter_type =
+              h_m->GetClassFromTypeIndex(types->GetTypeItem(i).type_idx_, true);
           mirror::Object* argument = gRegistry->Get<mirror::Object*>(arg_values[i], &error);
           if (error != JDWP::ERR_NONE) {
             return JDWP::ERR_INVALID_OBJECT;
@@ -3703,8 +3703,6 @@
           v.l = gRegistry->GetJObject(arg_values[i]);
         }
       }
-      // Update in case it moved.
-      m = mh.GetMethod();
     }
 
     req->receiver = receiver;
diff --git a/runtime/interpreter/interpreter_common.cc b/runtime/interpreter/interpreter_common.cc
index 041650f..3c7db85 100644
--- a/runtime/interpreter/interpreter_common.cc
+++ b/runtime/interpreter/interpreter_common.cc
@@ -538,16 +538,6 @@
   va_end(args);
 }
 
-static mirror::Class* GetClassFromTypeIdx(mirror::ArtMethod* method, uint16_t type_idx)
-    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-  mirror::Class* type = method->GetDexCacheResolvedType(type_idx);
-  if (type == nullptr) {
-    type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method);
-    CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
-  }
-  return type;
-}
-
 template<bool is_range, bool do_assignability_check>
 bool DoCall(ArtMethod* called_method, Thread* self, ShadowFrame& shadow_frame,
             const Instruction* inst, uint16_t inst_data, JValue* result) {
@@ -610,8 +600,9 @@
         case 'L': {
           Object* o = shadow_frame.GetVRegReference(src_reg);
           if (do_assignability_check && o != NULL) {
-            Class* arg_type = GetClassFromTypeIdx(new_shadow_frame->GetMethod(),
-                                                  params->GetTypeItem(shorty_pos).type_idx_);
+            Class* arg_type =
+                new_shadow_frame->GetMethod()->GetClassFromTypeIndex(
+                    params->GetTypeItem(shorty_pos).type_idx_, true);
             if (arg_type == NULL) {
               CHECK(self->IsExceptionPending());
               return false;
diff --git a/runtime/method_helper-inl.h b/runtime/method_helper-inl.h
index 7a7949e..2c18205 100644
--- a/runtime/method_helper-inl.h
+++ b/runtime/method_helper-inl.h
@@ -20,9 +20,7 @@
 #include "method_helper.h"
 
 #include "class_linker.h"
-#include "mirror/object_array.h"
-#include "runtime.h"
-#include "thread-inl.h"
+#include "dex_file-inl.h"
 
 namespace art {
 
@@ -45,18 +43,6 @@
   return dex_file->GetMethodSignature(mid) == other_dex_file->GetMethodSignature(other_mid);
 }
 
-template <template <class T> class HandleKind>
-inline mirror::Class* MethodHelperT<HandleKind>::GetClassFromTypeIdx(uint16_t type_idx,
-                                                                     bool resolve) {
-  mirror::ArtMethod* method = GetMethod();
-  mirror::Class* type = method->GetDexCacheResolvedType(type_idx);
-  if (type == nullptr && resolve) {
-    type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method);
-    CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
-  }
-  return type;
-}
-
 }  // namespace art
 
 #endif  // ART_RUNTIME_METHOD_HELPER_INL_H_
diff --git a/runtime/method_helper.cc b/runtime/method_helper.cc
index 683d1bd..9ca29ce 100644
--- a/runtime/method_helper.cc
+++ b/runtime/method_helper.cc
@@ -48,9 +48,10 @@
     return false;
   }
   for (uint32_t i = 0; i < num_types; ++i) {
-    mirror::Class* param_type = GetClassFromTypeIdx(types->GetTypeItem(i).type_idx_);
+    mirror::Class* param_type =
+        method_->GetClassFromTypeIndex(types->GetTypeItem(i).type_idx_, true);
     mirror::Class* other_param_type =
-        other->GetClassFromTypeIdx(other_types->GetTypeItem(i).type_idx_);
+        other->method_->GetClassFromTypeIndex(other_types->GetTypeItem(i).type_idx_, true);
     if (UNLIKELY(param_type != other_param_type)) {
       return false;
     }
diff --git a/runtime/method_helper.h b/runtime/method_helper.h
index 2630608..babcc83 100644
--- a/runtime/method_helper.h
+++ b/runtime/method_helper.h
@@ -106,9 +106,6 @@
   bool HasSameSignatureWithDifferentClassLoaders(Thread* self, MethodHelperT<HandleKind2>* other)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  mirror::Class* GetClassFromTypeIdx(uint16_t type_idx, bool resolve = true)
-      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
-
  protected:
   HandleKind<mirror::ArtMethod> method_;
 
diff --git a/runtime/mirror/art_method-inl.h b/runtime/mirror/art_method-inl.h
index 85ef4e6..c29276a 100644
--- a/runtime/mirror/art_method-inl.h
+++ b/runtime/mirror/art_method-inl.h
@@ -140,6 +140,15 @@
   return GetDexCacheResolvedTypes() == other->GetDexCacheResolvedTypes();
 }
 
+inline mirror::Class* ArtMethod::GetClassFromTypeIndex(uint16_t type_idx, bool resolve) {
+  mirror::Class* type = GetDexCacheResolvedType(type_idx);
+  if (type == nullptr && resolve) {
+    type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, this);
+    CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
+  }
+  return type;
+}
+
 inline uint32_t ArtMethod::GetCodeSize() {
   DCHECK(!IsRuntimeMethod() && !IsProxyMethod()) << PrettyMethod(this);
   const void* code = EntryPointToCodePointer(GetEntryPointFromQuickCompiledCode());
diff --git a/runtime/mirror/art_method.cc b/runtime/mirror/art_method.cc
index 40c2b2c..0f13344 100644
--- a/runtime/mirror/art_method.cc
+++ b/runtime/mirror/art_method.cc
@@ -257,7 +257,6 @@
 
 uint32_t ArtMethod::FindCatchBlock(Handle<ArtMethod> h_this, Handle<Class> exception_type,
                                    uint32_t dex_pc, bool* has_no_move_exception) {
-  MethodHelper mh(h_this);
   const DexFile::CodeItem* code_item = h_this->GetCodeItem();
   // Set aside the exception while we resolve its type.
   Thread* self = Thread::Current();
@@ -277,7 +276,7 @@
       break;
     }
     // Does this catch exception type apply?
-    Class* iter_exception_type = mh.GetClassFromTypeIdx(iter_type_idx);
+    Class* iter_exception_type = h_this->GetClassFromTypeIndex(iter_type_idx, true);
     if (UNLIKELY(iter_exception_type == nullptr)) {
       // Now have a NoClassDefFoundError as exception. Ignore in case the exception class was
       // removed by a pro-guard like tool.
diff --git a/runtime/mirror/art_method.h b/runtime/mirror/art_method.h
index 04f8efc..2107944 100644
--- a/runtime/mirror/art_method.h
+++ b/runtime/mirror/art_method.h
@@ -237,6 +237,10 @@
   bool HasSameDexCacheResolvedTypes(ObjectArray<Class>* other_cache)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
+  // Get the Class* from the type index into this method's dex cache.
+  mirror::Class* GetClassFromTypeIndex(uint16_t type_idx, bool resolve)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
   // Find the method that this method overrides.
   ArtMethod* FindOverriddenMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
diff --git a/runtime/reflection.cc b/runtime/reflection.cc
index 07afcb6..85f9938 100644
--- a/runtime/reflection.cc
+++ b/runtime/reflection.cc
@@ -21,7 +21,6 @@
 #include "dex_file-inl.h"
 #include "entrypoints/entrypoint_utils.h"
 #include "jni_internal.h"
-#include "method_helper-inl.h"
 #include "mirror/art_field-inl.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/class-inl.h"
@@ -220,9 +219,10 @@
   }
 
   bool BuildArgArrayFromObjectArray(mirror::Object* receiver,
-                                    mirror::ObjectArray<mirror::Object>* args, MethodHelper& mh)
+                                    mirror::ObjectArray<mirror::Object>* args,
+                                    Handle<mirror::ArtMethod> h_m)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-    const DexFile::TypeList* classes = mh.GetMethod()->GetParameterTypeList();
+    const DexFile::TypeList* classes = h_m->GetParameterTypeList();
     // Set receiver if non-null (method is not static)
     if (receiver != nullptr) {
       Append(receiver);
@@ -231,11 +231,11 @@
       mirror::Object* arg = args->Get(args_offset);
       if (((shorty_[i] == 'L') && (arg != nullptr)) || ((arg == nullptr && shorty_[i] != 'L'))) {
         mirror::Class* dst_class =
-            mh.GetClassFromTypeIdx(classes->GetTypeItem(args_offset).type_idx_);
+            h_m->GetClassFromTypeIndex(classes->GetTypeItem(args_offset).type_idx_, true);
         if (UNLIKELY(arg == nullptr || !arg->InstanceOf(dst_class))) {
           ThrowIllegalArgumentException(nullptr,
               StringPrintf("method %s argument %zd has type %s, got %s",
-                  PrettyMethod(mh.GetMethod(), false).c_str(),
+                  PrettyMethod(h_m.Get(), false).c_str(),
                   args_offset + 1,  // Humans don't count from 0.
                   PrettyDescriptor(dst_class).c_str(),
                   PrettyTypeOf(arg).c_str()).c_str());
@@ -263,7 +263,7 @@
             } else { \
               ThrowIllegalArgumentException(nullptr, \
                   StringPrintf("method %s argument %zd has type %s, got %s", \
-                      PrettyMethod(mh.GetMethod(), false).c_str(), \
+                      PrettyMethod(h_m.Get(), false).c_str(), \
                       args_offset + 1, \
                       expected, \
                       PrettyTypeOf(arg).c_str()).c_str()); \
@@ -329,6 +329,7 @@
 #ifndef NDEBUG
         default:
           LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
+          UNREACHABLE();
 #endif
       }
 #undef DO_FIRST_ARG
@@ -360,14 +361,13 @@
   if (!m->IsStatic()) {
     offset = 1;
   }
-  // TODO: If args contain object references, it may cause problems
+  // TODO: If args contain object references, it may cause problems.
   Thread* self = Thread::Current();
   StackHandleScope<1> hs(self);
   Handle<mirror::ArtMethod> h_m(hs.NewHandle(m));
-  MethodHelper mh(h_m);
   for (uint32_t i = 0; i < num_params; i++) {
     uint16_t type_idx = params->GetTypeItem(i).type_idx_;
-    mirror::Class* param_type = mh.GetClassFromTypeIdx(type_idx);
+    mirror::Class* param_type = h_m->GetClassFromTypeIndex(type_idx, true);
     if (param_type == nullptr) {
       CHECK(self->IsExceptionPending());
       LOG(ERROR) << "Internal error: unresolvable type for argument type in JNI invoke: "
@@ -572,7 +572,7 @@
     // Check that the receiver is non-null and an instance of the field's declaring class.
     receiver = soa.Decode<mirror::Object*>(javaReceiver);
     if (!VerifyObjectIsClass(receiver, declaring_class)) {
-      return NULL;
+      return nullptr;
     }
 
     // Find the actual implementation of the virtual method.
@@ -586,10 +586,10 @@
   uint32_t classes_size = (classes == nullptr) ? 0 : classes->Size();
   uint32_t arg_count = (objects != nullptr) ? objects->GetLength() : 0;
   if (arg_count != classes_size) {
-    ThrowIllegalArgumentException(NULL,
+    ThrowIllegalArgumentException(nullptr,
                                   StringPrintf("Wrong number of arguments; expected %d, got %d",
                                                classes_size, arg_count).c_str());
-    return NULL;
+    return nullptr;
   }
 
   // If method is not set to be accessible, verify it can be accessed by the caller.
@@ -612,8 +612,8 @@
   const char* shorty = m->GetShorty(&shorty_len);
   ArgArray arg_array(shorty, shorty_len);
   StackHandleScope<1> hs(soa.Self());
-  MethodHelper mh(hs.NewHandle(m));
-  if (!arg_array.BuildArgArrayFromObjectArray(receiver, objects, mh)) {
+  Handle<mirror::ArtMethod> h_m(hs.NewHandle(m));
+  if (!arg_array.BuildArgArrayFromObjectArray(receiver, objects, h_m)) {
     CHECK(soa.Self()->IsExceptionPending());
     return nullptr;
   }
@@ -628,22 +628,21 @@
     jmethodID mid = soa.Env()->GetMethodID(exception_class, "<init>", "(Ljava/lang/Throwable;)V");
     jobject exception_instance = soa.Env()->NewObject(exception_class, mid, th);
     soa.Env()->Throw(reinterpret_cast<jthrowable>(exception_instance));
-    return NULL;
+    return nullptr;
   }
 
   // Box if necessary and return.
-  return soa.AddLocalReference<jobject>(
-      BoxPrimitive(Primitive::GetType(mh.GetMethod()->GetReturnTypeDescriptor()[0]), result));
+  return soa.AddLocalReference<jobject>(BoxPrimitive(Primitive::GetType(shorty[0]), result));
 }
 
 bool VerifyObjectIsClass(mirror::Object* o, mirror::Class* c) {
-  if (o == NULL) {
-    ThrowNullPointerException(NULL, "null receiver");
+  if (o == nullptr) {
+    ThrowNullPointerException(nullptr, "null receiver");
     return false;
   } else if (!o->InstanceOf(c)) {
     std::string expected_class_name(PrettyDescriptor(c));
     std::string actual_class_name(PrettyTypeOf(o));
-    ThrowIllegalArgumentException(NULL,
+    ThrowIllegalArgumentException(nullptr,
                                   StringPrintf("Expected receiver of type %s, but got %s",
                                                expected_class_name.c_str(),
                                                actual_class_name.c_str()).c_str());