diff --git a/runtime/field_helper.cc b/runtime/field_helper.cc
new file mode 100644
index 0000000..40daa6d
--- /dev/null
+++ b/runtime/field_helper.cc
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "field_helper.h"
+
+#include "class_linker-inl.h"
+#include "dex_file.h"
+#include "mirror/dex_cache.h"
+#include "runtime.h"
+#include "thread-inl.h"
+
+namespace art {
+
+mirror::Class* FieldHelper::GetType(bool resolve) {
+  uint32_t field_index = field_->GetDexFieldIndex();
+  if (UNLIKELY(field_->GetDeclaringClass()->IsProxyClass())) {
+    return Runtime::Current()->GetClassLinker()->FindSystemClass(Thread::Current(),
+                                                                 field_->GetTypeDescriptor());
+  }
+  const DexFile* dex_file = field_->GetDexFile();
+  const DexFile::FieldId& field_id = dex_file->GetFieldId(field_index);
+  mirror::Class* type = field_->GetDexCache()->GetResolvedType(field_id.type_idx_);
+  if (resolve && (type == nullptr)) {
+    type = Runtime::Current()->GetClassLinker()->ResolveType(field_id.type_idx_, field_.Get());
+    CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
+  }
+  return type;
+}
+
+const char* FieldHelper::GetDeclaringClassDescriptor() {
+  uint32_t field_index = field_->GetDexFieldIndex();
+  if (UNLIKELY(field_->GetDeclaringClass()->IsProxyClass())) {
+    DCHECK(field_->IsStatic());
+    DCHECK_LT(field_index, 2U);
+    // 0 == Class[] interfaces; 1 == Class[][] throws;
+    declaring_class_descriptor_ = field_->GetDeclaringClass()->GetDescriptor();
+    return declaring_class_descriptor_.c_str();
+  }
+  const DexFile* dex_file = field_->GetDexFile();
+  const DexFile::FieldId& field_id = dex_file->GetFieldId(field_index);
+  return dex_file->GetFieldDeclaringClassDescriptor(field_id);
+}
+
+}  // namespace art