diff --git a/clang-tools-extra/clang-reorder-fields/tool/ClangReorderFields.cpp b/clang-tools-extra/clang-reorder-fields/tool/ClangReorderFields.cpp
@@ -0,0 +1,93 @@
+//===-- tools/extra/clang-reorder-fields/tool/ClangReorderFields.cpp -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains the implementation of clang-reorder-fields tool
+///
+//===----------------------------------------------------------------------===//
+
+#include "../ReorderFieldsAction.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/CommonOptionsParser.h"
+#include "clang/Tooling/Refactoring.h"
+#include "clang/Tooling/Tooling.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
+#include <cstdlib>
+#include <string>
+#include <system_error>
+
+using namespace llvm;
+using namespace clang;
+
+cl::OptionCategory ClangReorderFieldsCategory("clang-reorder-fields options");
+
+static cl::opt<std::string>
+    RecordName("record-name", cl::Required,
+               cl::desc("The name of the struct/class."),
+               cl::cat(ClangReorderFieldsCategory));
+
+static cl::list<std::string> FieldsOrder("fields-order", cl::CommaSeparated,
+                                         cl::OneOrMore,
+                                         cl::desc("The desired fields order."),
+                                         cl::cat(ClangReorderFieldsCategory));
+
+static cl::opt<bool> Inplace("i", cl::desc("Overwrite edited files."),
+                             cl::cat(ClangReorderFieldsCategory));
+
+const char Usage[] = "A tool to reorder fields in C/C++ structs/classes.\n";
+
+int main(int argc, const char **argv) {
+  tooling::CommonOptionsParser OP(argc, argv, ClangReorderFieldsCategory,
+                                  Usage);
+
+  auto Files = OP.getSourcePathList();
+  tooling::RefactoringTool Tool(OP.getCompilations(), Files);
+
+  reorder_fields::ReorderFieldsAction Action(RecordName, FieldsOrder,
+                                             Tool.getReplacements());
+
+  auto Factory = tooling::newFrontendActionFactory(&Action);
+
+  if (Inplace)
+    return Tool.runAndSave(Factory.get());
+
+  int ExitCode = Tool.run(Factory.get());
+  LangOptions DefaultLangOptions;
+  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts(new DiagnosticOptions());
+  TextDiagnosticPrinter DiagnosticPrinter(errs(), &*DiagOpts);
+  DiagnosticsEngine Diagnostics(
+      IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
+      &DiagnosticPrinter, false);
+
+  auto &FileMgr = Tool.getFiles();
+  SourceManager Sources(Diagnostics, FileMgr);
+  Rewriter Rewrite(Sources, DefaultLangOptions);
+  Tool.applyAllReplacements(Rewrite);
+
+  for (const auto &File : Files) {
+    const auto *Entry = FileMgr.getFile(File);
+    const auto ID = Sources.translateFile(Entry);
+    // The method Rewriter::getRewriteBufferFor returns nullptr if
+    // the file has not been changed.
+    if (const auto *RB = Rewrite.getRewriteBufferFor(ID))
+      RB->write(outs());
+    else
+      outs() << Sources.getMemoryBufferForFile(Entry)->getBuffer();
+  }
+
+  return ExitCode;
+}
diff --git a/clang-tools-extra/test/CMakeLists.txt b/clang-tools-extra/test/CMakeLists.txt
@@ -45,6 +45,7 @@ set(CLANG_TOOLS_TEST_DEPS
   clang-include-fixer
   clang-query
   clang-rename
+  clang-reorder-fields
   clang-tidy
   find-all-symbols
   modularize

diff --git a/clang-tools-extra/test/clang-reorder-fields/AggregatePartialInitialization.cpp b/clang-tools-extra/test/clang-reorder-fields/AggregatePartialInitialization.cpp
@@ -0,0 +1,14 @@
+// RUN: clang-reorder-fields -record-name Foo -fields-order z,y,x %s -- | FileCheck %s
+
+// The order of fields should not change.
+class Foo {
+public:
+  int x;  // CHECK:       {{^  int x;}}
+  int y;  // CHECK-NEXT:  {{^  int y;}}
+  int z;  // CHECK-NEXT:  {{^  int z;}}
+};
+
+int main() {
+  Foo foo = { 0, 1 }; // CHECK: {{^  Foo foo = { 0, 1 };}}
+  return 0;
+}
diff --git a/clang-tools-extra/test/clang-reorder-fields/CStructAmbiguousName.cpp b/clang-tools-extra/test/clang-reorder-fields/CStructAmbiguousName.cpp
@@ -0,0 +1,18 @@
+// RUN: clang-reorder-fields -record-name ::Foo -fields-order y,x %s -- | FileCheck %s
+
+struct Foo {
+  int x;    // CHECK:      {{^  double y;}}
+  double y; // CHECK-NEXT: {{^  int x;}}
+};
+
+namespace bar {
+struct Foo {
+  int x;    // CHECK:      {{^  int x;}}
+  double y; // CHECK-NEXT: {{^  double y;}}
+};
+} // end namespace bar
+
+int main() {
+  bar::Foo foo = { 1, 1.7 }; // CHECK: {{^  bar::Foo foo = { 1, 1.7 };}}
+  return 0;
+}
diff --git a/clang-tools-extra/test/clang-reorder-fields/CStructFieldsOrder.cpp b/clang-tools-extra/test/clang-reorder-fields/CStructFieldsOrder.cpp
@@ -0,0 +1,16 @@
+// RUN: clang-reorder-fields -record-name ::bar::Foo -fields-order z,w,y,x %s -- | FileCheck %s
+
+namespace bar {
+struct Foo {
+  const int* x; // CHECK:      {{^  double z;}}
+  int y;        // CHECK-NEXT: {{^  int w;}}
+  double z;     // CHECK-NEXT: {{^  int y;}}
+  int w;        // CHECK-NEXT: {{^  const int\* x}}
+};
+} // end namespace bar
+
+int main() {
+  const int x = 13;
+  bar::Foo foo = { &x, 0, 1.29, 17 }; // CHECK: {{^  bar::Foo foo = { 1.29, 17, 0, &x };}} 
+  return 0;
+}
diff --git a/clang-tools-extra/test/clang-reorder-fields/ClassDifferentFieldsAccesses.cpp b/clang-tools-extra/test/clang-reorder-fields/ClassDifferentFieldsAccesses.cpp
@@ -0,0 +1,16 @@
+// RUN: clang-reorder-fields -record-name Foo -fields-order z,y,x %s -- | FileCheck %s
+
+// The order of fields should not change.
+class Foo {
+public:
+  int x;  // CHECK:       {{^  int x;}}
+
+private:
+  int y;  // CHECK:       {{^  int y;}}
+  int z;  // CHECK-NEXT:  {{^  int z;}}
+};
+
+int main() {
+  Foo foo;
+  return 0;
+}
diff --git a/clang-tools-extra/test/clang-reorder-fields/ClassMixedInitialization.cpp b/clang-tools-extra/test/clang-reorder-fields/ClassMixedInitialization.cpp
@@ -0,0 +1,24 @@
+// RUN: clang-reorder-fields -record-name Foo -fields-order e,x,pi,s2,s1 %s -- -std=c++11 | FileCheck %s
+
+class Foo {
+public:
+  Foo();
+
+private:
+  int x;              // CHECK:      {{^  double e = 2.71;}}
+  const char *s1;     // CHECK-NEXT: {{^  int x;}}
+  const char *s2;     // CHECK-NEXT: {{^  double pi = 3.14;}}
+  double pi = 3.14;   // CHECK-NEXT: {{^  const char \*s2;}}
+  double e = 2.71;    // CHECK-NEXT: {{^  const char \*s1;}}
+};
+
+Foo::Foo():
+  x(12),      // CHECK:      {{^  x\(12\)}},
+  s1("abc"),  // CHECK-NEXT: {{^  s2\("def"\)}},
+  s2("def")   // CHECK-NEXT: {{^  s1\("abc"\)}}
+{}
+
+int main() {
+  Foo foo;
+  return 0;
+}
diff --git a/clang-tools-extra/test/clang-reorder-fields/ClassSimpleCtor.cpp b/clang-tools-extra/test/clang-reorder-fields/ClassSimpleCtor.cpp
@@ -0,0 +1,24 @@
+// RUN: clang-reorder-fields -record-name Foo -fields-order s1,x,z,s2 %s -- | FileCheck %s
+
+class Foo {
+public:
+  Foo();
+
+private:
+  int x;              // CHECK:      {{^  const char \*s1;}}
+  const char *s1;     // CHECK-NEXT: {{^  int x;}}
+  const char *s2;     // CHECK-NEXT: {{^  double z;}}
+  double z;           // CHECK-NEXT: {{^  const char \*s2;}}
+};
+
+Foo::Foo():
+  x(12),      // CHECK:      {{^  s1\("abc"\),}}
+  s1("abc"),  // CHECK-NEXT: {{^  x\(12\),}}
+  s2("def"),  // CHECK-NEXT: {{^  z\(3.14\),}}
+  z(3.14)     // CHECK-NEXT: {{^  s2\("def"\)}}
+{}
+
+int main() {
+  Foo foo;
+  return 0;
+}