diff --git a/llvm/include/llvm/Object/FunctionIndexObjectFile.h b/llvm/include/llvm/Object/FunctionIndexObjectFile.h
@@ -0,0 +1,99 @@
+//===- FunctionIndexObjectFile.h - Function index file implementation -----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the FunctionIndexObjectFile template class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECT_FUNCTIONINDEXOBJECTFILE_H
+#define LLVM_OBJECT_FUNCTIONINDEXOBJECTFILE_H
+
+#include "llvm/Object/SymbolicFile.h"
+
+namespace llvm {
+class FunctionInfoIndex;
+
+namespace object {
+class ObjectFile;
+
+/// This class is used to read just the function summary index related
+/// sections out of the given object (which may contain a single module's
+/// bitcode or be a combined index bitcode file). It builds a FunctionInfoIndex
+/// object.
+class FunctionIndexObjectFile : public SymbolicFile {
+  std::unique_ptr<FunctionInfoIndex> Index;
+
+ public:
+  FunctionIndexObjectFile(MemoryBufferRef Object,
+                          std::unique_ptr<FunctionInfoIndex> I);
+  ~FunctionIndexObjectFile() override;
+
+  // TODO: Walk through FunctionMap entries for function symbols.
+  // However, currently these interfaces are not used by any consumers.
+  void moveSymbolNext(DataRefImpl &Symb) const override {
+    llvm_unreachable("not implemented");
+  }
+  std::error_code printSymbolName(raw_ostream &OS,
+                                  DataRefImpl Symb) const override {
+    llvm_unreachable("not implemented");
+    return std::error_code();
+  }
+  uint32_t getSymbolFlags(DataRefImpl Symb) const override {
+    llvm_unreachable("not implemented");
+    return 0;
+  }
+  basic_symbol_iterator symbol_begin_impl() const override {
+    llvm_unreachable("not implemented");
+    return basic_symbol_iterator(BasicSymbolRef());
+  }
+  basic_symbol_iterator symbol_end_impl() const override {
+    llvm_unreachable("not implemented");
+    return basic_symbol_iterator(BasicSymbolRef());
+  }
+
+  const FunctionInfoIndex &getIndex() const {
+    return const_cast<FunctionIndexObjectFile *>(this)->getIndex();
+  }
+  FunctionInfoIndex &getIndex() { return *Index; }
+  std::unique_ptr<FunctionInfoIndex> takeIndex();
+
+  static inline bool classof(const Binary *v) { return v->isFunctionIndex(); }
+
+  /// \brief Finds and returns bitcode embedded in the given object file, or an
+  /// error code if not found.
+  static ErrorOr<MemoryBufferRef> findBitcodeInObject(const ObjectFile &Obj);
+
+  /// \brief Finds and returns bitcode in the given memory buffer (which may
+  /// be either a bitcode file or a native object file with embedded bitcode),
+  /// or an error code if not found.
+  static ErrorOr<MemoryBufferRef> findBitcodeInMemBuffer(
+      MemoryBufferRef Object);
+
+  /// \brief Looks for function summary in the given memory buffer,
+  /// returns true if found, else false.
+  static bool hasFunctionSummaryInMemBuffer(MemoryBufferRef Object,
+                                            LLVMContext &Context);
+
+  /// \brief Parse function index in the given memory buffer.
+  /// Return new FunctionIndexObjectFile instance containing parsed function
+  /// summary/index.
+  static ErrorOr<std::unique_ptr<FunctionIndexObjectFile>> create(
+      MemoryBufferRef Object, LLVMContext &Context, bool IsLazy = false);
+
+  /// \brief Parse the function summary information for function with the
+  /// given name out of the given buffer. Parsed information is
+  /// stored on the index object saved in this object.
+  std::error_code findFunctionSummaryInMemBuffer(MemoryBufferRef Object,
+                                                 LLVMContext &Context,
+                                                 StringRef FunctionName);
+};
+}
+}
+
+#endif
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriterPass.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriterPass.cpp
@@ -19,25 +19,29 @@
 using namespace llvm;
 
 PreservedAnalyses BitcodeWriterPass::run(Module &M) {
-  WriteBitcodeToFile(&M, OS, ShouldPreserveUseListOrder);
+  WriteBitcodeToFile(&M, OS, ShouldPreserveUseListOrder, EmitFunctionSummary);
   return PreservedAnalyses::all();
 }
 
 namespace {
   class WriteBitcodePass : public ModulePass {
     raw_ostream &OS; // raw_ostream to print on
     bool ShouldPreserveUseListOrder;
+    bool EmitFunctionSummary;
 
   public:
     static char ID; // Pass identification, replacement for typeid
-    explicit WriteBitcodePass(raw_ostream &o, bool ShouldPreserveUseListOrder)
+    explicit WriteBitcodePass(raw_ostream &o, bool ShouldPreserveUseListOrder,
+                              bool EmitFunctionSummary)
         : ModulePass(ID), OS(o),
-          ShouldPreserveUseListOrder(ShouldPreserveUseListOrder) {}
+          ShouldPreserveUseListOrder(ShouldPreserveUseListOrder),
+          EmitFunctionSummary(EmitFunctionSummary) {}
 
     const char *getPassName() const override { return "Bitcode Writer"; }
 
     bool runOnModule(Module &M) override {
-      WriteBitcodeToFile(&M, OS, ShouldPreserveUseListOrder);
+      WriteBitcodeToFile(&M, OS, ShouldPreserveUseListOrder,
+                         EmitFunctionSummary);
       return false;
     }
   };
@@ -46,6 +50,8 @@ namespace {
 char WriteBitcodePass::ID = 0;
 
 ModulePass *llvm::createBitcodeWriterPass(raw_ostream &Str,
-                                          bool ShouldPreserveUseListOrder) {
-  return new WriteBitcodePass(Str, ShouldPreserveUseListOrder);
+                                          bool ShouldPreserveUseListOrder,
+                                          bool EmitFunctionSummary) {
+  return new WriteBitcodePass(Str, ShouldPreserveUseListOrder,
+                              EmitFunctionSummary);
 }
diff --git a/llvm/lib/IR/CMakeLists.txt b/llvm/lib/IR/CMakeLists.txt
@@ -39,6 +39,7 @@ add_llvm_library(LLVMCore
   PassManager.cpp
   PassRegistry.cpp
   Statepoint.cpp
+  FunctionInfo.cpp
   Type.cpp
   TypeFinder.cpp
   Use.cpp

diff --git a/llvm/lib/IR/FunctionInfo.cpp b/llvm/lib/IR/FunctionInfo.cpp
@@ -0,0 +1,63 @@
+//===-- FunctionInfo.cpp - Function Info Index ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the function info index and summary classes for the
+// IR library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/FunctionInfo.h"
+#include "llvm/ADT/StringMap.h"
+using namespace llvm;
+
+// Create the combined function index/summary from multiple
+// per-module instances.
+void FunctionInfoIndex::mergeFrom(std::unique_ptr<FunctionInfoIndex> Other,
+                                  uint64_t NextModuleId) {
+
+  StringRef ModPath;
+  for (auto &OtherFuncInfoLists : *Other) {
+    StringRef FuncName = OtherFuncInfoLists.getKey();
+    FunctionInfoList &List = OtherFuncInfoLists.second;
+
+    // Assert that the func info list only has one entry, since we shouldn't
+    // have duplicate names within a single per-module index.
+    assert(List.size() == 1);
+    std::unique_ptr<FunctionInfo> Info = std::move(List.front());
+
+    // Add the module path string ref for this module if we haven't already
+    // saved a reference to it.
+    if (ModPath.empty())
+      ModPath =
+          addModulePath(Info->functionSummary()->modulePath(), NextModuleId);
+    else
+      assert(ModPath == Info->functionSummary()->modulePath() &&
+             "Each module in the combined map should have a unique ID");
+
+    // Note the module path string ref was copied above and is still owned by
+    // the original per-module index. Reset it to the new module path
+    // string reference owned by the combined index.
+    Info->functionSummary()->setModulePath(ModPath);
+
+    // If it is a local function, rename it.
+    if (Info->functionSummary()->isLocalFunction()) {
+      // Any local functions are virtually renamed when being added to the
+      // combined index map, to disambiguate from other functions with
+      // the same name. The symbol table created for the combined index
+      // file should contain the renamed symbols.
+      FuncName =
+          FunctionInfoIndex::getGlobalNameForLocal(FuncName, NextModuleId);
+    }
+
+    // Add new function info to existing list. There may be duplicates when
+    // combining FunctionMap entries, due to COMDAT functions. Any local
+    // functions were virtually renamed above.
+    addFunctionInfo(FuncName, std::move(Info));
+  }
+}
diff --git a/llvm/lib/Object/CMakeLists.txt b/llvm/lib/Object/CMakeLists.txt
@@ -16,6 +16,7 @@ add_llvm_library(LLVMObject
   RecordStreamer.cpp
   SymbolicFile.cpp
   SymbolSize.cpp
+  FunctionIndexObjectFile.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Object

diff --git a/llvm/lib/Object/FunctionIndexObjectFile.cpp b/llvm/lib/Object/FunctionIndexObjectFile.cpp
@@ -0,0 +1,114 @@
+//===- FunctionIndexObjectFile.cpp - Function index file implementation ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Part of the FunctionIndexObjectFile class implementation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/FunctionIndexObjectFile.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/IR/FunctionInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+using namespace object;
+
+FunctionIndexObjectFile::FunctionIndexObjectFile(
+    MemoryBufferRef Object, std::unique_ptr<FunctionInfoIndex> I)
+    : SymbolicFile(Binary::ID_FunctionIndex, Object), Index(std::move(I)) {}
+
+FunctionIndexObjectFile::~FunctionIndexObjectFile() {}
+
+std::unique_ptr<FunctionInfoIndex> FunctionIndexObjectFile::takeIndex() {
+  return std::move(Index);
+}
+
+ErrorOr<MemoryBufferRef> FunctionIndexObjectFile::findBitcodeInObject(
+    const ObjectFile &Obj) {
+  for (const SectionRef &Sec : Obj.sections()) {
+    StringRef SecName;
+    if (std::error_code EC = Sec.getName(SecName)) return EC;
+    if (SecName == ".llvmbc") {
+      StringRef SecContents;
+      if (std::error_code EC = Sec.getContents(SecContents)) return EC;
+      return MemoryBufferRef(SecContents, Obj.getFileName());
+    }
+  }
+
+  return object_error::bitcode_section_not_found;
+}
+
+ErrorOr<MemoryBufferRef> FunctionIndexObjectFile::findBitcodeInMemBuffer(
+    MemoryBufferRef Object) {
+  sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
+  switch (Type) {
+    case sys::fs::file_magic::bitcode:
+      return Object;
+    case sys::fs::file_magic::elf_relocatable:
+    case sys::fs::file_magic::macho_object:
+    case sys::fs::file_magic::coff_object: {
+      ErrorOr<std::unique_ptr<ObjectFile>> ObjFile =
+          ObjectFile::createObjectFile(Object, Type);
+      if (!ObjFile) return ObjFile.getError();
+      return findBitcodeInObject(*ObjFile->get());
+    }
+    default:
+      return object_error::invalid_file_type;
+  }
+}
+
+// Looks for function index in the given memory buffer.
+// returns true if found, else false.
+bool FunctionIndexObjectFile::hasFunctionSummaryInMemBuffer(
+    MemoryBufferRef Object, LLVMContext &Context) {
+  ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
+  if (!BCOrErr) return false;
+
+  return hasFunctionSummary(BCOrErr.get(), Context, nullptr);
+}
+
+// Parse function index in the given memory buffer.
+// Return new FunctionIndexObjectFile instance containing parsed
+// function summary/index.
+ErrorOr<std::unique_ptr<FunctionIndexObjectFile>>
+FunctionIndexObjectFile::create(MemoryBufferRef Object, LLVMContext &Context,
+                                bool IsLazy) {
+  std::unique_ptr<FunctionInfoIndex> Index;
+
+  ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
+  if (!BCOrErr) return BCOrErr.getError();
+
+  ErrorOr<std::unique_ptr<FunctionInfoIndex>> IOrErr =
+      getFunctionInfoIndex(BCOrErr.get(), Context, nullptr, IsLazy);
+
+  if (std::error_code EC = IOrErr.getError()) return EC;
+
+  Index = std::move(IOrErr.get());
+
+  return llvm::make_unique<FunctionIndexObjectFile>(Object, std::move(Index));
+}
+
+// Parse the function summary information for function with the
+// given name out of the given buffer. Parsed information is
+// stored on the index object saved in this object.
+std::error_code FunctionIndexObjectFile::findFunctionSummaryInMemBuffer(
+    MemoryBufferRef Object, LLVMContext &Context, StringRef FunctionName) {
+  sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
+  switch (Type) {
+    case sys::fs::file_magic::bitcode: {
+      return readFunctionSummary(Object, Context, nullptr, FunctionName,
+                                 std::move(Index));
+    }
+    default:
+      return object_error::invalid_file_type;
+  }
+}
diff --git a/llvm/test/Bitcode/thinlto-function-summary.ll b/llvm/test/Bitcode/thinlto-function-summary.ll
@@ -0,0 +1,45 @@
+; RUN: llvm-as -function-summary < %s | llvm-bcanalyzer -dump | FileCheck %s -check-prefix=BC
+; Check for function summary block/records.
+
+; BC: <FUNCTION_SUMMARY_BLOCK
+; BC-NEXT: <PERMODULE_ENTRY
+; BC-NEXT: <PERMODULE_ENTRY
+; BC-NEXT: <PERMODULE_ENTRY
+; BC-NEXT: </FUNCTION_SUMMARY_BLOCK
+
+; RUN: llvm-as -function-summary < %s | llvm-dis | FileCheck %s
+; Check that this round-trips correctly.
+
+; ModuleID = '<stdin>'
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; CHECK: define i32 @foo()
+
+; Function Attrs: nounwind uwtable
+define i32 @foo() #0 {
+entry:
+  ret i32 1
+}
+
+; CHECK: define i32 @bar(i32 %x)
+
+; Function Attrs: nounwind uwtable
+define i32 @bar(i32 %x) #0 {
+entry:
+  ret i32 %x
+}
+
+; Check an anonymous function as well, since in that case only the alias
+; ends up in the value symbol table and having a summary.
+@f = alias void (), void ()* @0   ; <void ()*> [#uses=0]
+@h = external global void ()*     ; <void ()*> [#uses=0]
+
+define internal void @0() nounwind {
+entry:
+  store void()* @0, void()** @h
+        br label %return
+
+return:         ; preds = %entry
+        ret void
+}
diff --git a/llvm/test/tools/gold/X86/Inputs/thinlto.ll b/llvm/test/tools/gold/X86/Inputs/thinlto.ll
@@ -0,0 +1,4 @@
+define void @g() {
+entry:
+  ret void
+}
diff --git a/llvm/test/tools/gold/X86/thinlto.ll b/llvm/test/tools/gold/X86/thinlto.ll
@@ -0,0 +1,22 @@
+; RUN: llvm-as -function-summary %s -o %t.o
+; RUN: llvm-as -function-summary %p/Inputs/thinlto.ll -o %t2.o
+
+; RUN: %gold -plugin %llvmshlibdir/LLVMgold.so \
+; RUN:    --plugin-opt=thinlto \
+; RUN:    -shared %t.o %t2.o -o %t3
+; RUN: llvm-bcanalyzer -dump %t3.thinlto.bc | FileCheck %s --check-prefix=COMBINED
+; RUN: not test -e %t3
+
+; COMBINED: <MODULE_STRTAB_BLOCK
+; COMBINED-NEXT: <ENTRY
+; COMBINED-NEXT: <ENTRY
+; COMBINED-NEXT: </MODULE_STRTAB_BLOCK
+; COMBINED-NEXT: <FUNCTION_SUMMARY_BLOCK
+; COMBINED-NEXT: <COMBINED_ENTRY
+; COMBINED-NEXT: <COMBINED_ENTRY
+; COMBINED-NEXT: </FUNCTION_SUMMARY_BLOCK
+
+define void @f() {
+entry:
+  ret void
+}
diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
@@ -32,6 +32,7 @@
 #include "llvm/Linker/Linker.h"
 #include "llvm/MC/SubtargetFeature.h"
 #include "llvm/Object/IRObjectFile.h"
+#include "llvm/Object/FunctionIndexObjectFile.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/ManagedStatic.h"
@@ -103,6 +104,10 @@ namespace options {
   static std::string extra_library_path;
   static std::string triple;
   static std::string mcpu;
+  // When the thinlto plugin option is specified, only read the function
+  // the information from intermediate files and write a combined
+  // global index for the ThinLTO backends.
+  static bool thinlto = false;
   // Additional options to pass into the code generator.
   // Note: This array will contain all plugin options which are not claimed
   // as plugin exclusive to pass to the code generator.
@@ -132,6 +137,8 @@ namespace options {
       TheOutputType = OT_SAVE_TEMPS;
     } else if (opt == "disable-output") {
       TheOutputType = OT_DISABLE;
+    } else if (opt == "thinlto") {
+      thinlto = true;
     } else if (opt.size() == 2 && opt[0] == 'O') {
       if (opt[1] < '0' || opt[1] > '3')
         message(LDPL_FATAL, "Optimization level must be between 0 and 3");
@@ -376,6 +383,10 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
 
   cf.handle = file->handle;
 
+  // If we are doing ThinLTO compilation, don't need to process the symbols.
+  // Later we simply build a combined index file after all files are claimed.
+  if (options::thinlto) return LDPS_OK;
+
   for (auto &Sym : Obj->symbols()) {
     uint32_t Symflags = Sym.getFlags();
     if (shouldSkip(Symflags))
@@ -591,6 +602,30 @@ static void freeSymName(ld_plugin_symbol &Sym) {
   Sym.comdat_key = nullptr;
 }
 
+static std::unique_ptr<FunctionInfoIndex> getFunctionIndexForFile(
+    LLVMContext &Context, claimed_file &F, ld_plugin_input_file &Info) {
+
+  if (get_symbols(F.handle, F.syms.size(), &F.syms[0]) != LDPS_OK)
+    message(LDPL_FATAL, "Failed to get symbol information");
+
+  const void *View;
+  if (get_view(F.handle, &View) != LDPS_OK)
+    message(LDPL_FATAL, "Failed to get a view of file");
+
+  MemoryBufferRef BufferRef(StringRef((const char *)View, Info.filesize),
+                            Info.name);
+  ErrorOr<std::unique_ptr<object::FunctionIndexObjectFile>> ObjOrErr =
+      object::FunctionIndexObjectFile::create(BufferRef, Context);
+
+  if (std::error_code EC = ObjOrErr.getError())
+    message(LDPL_FATAL, "Could not read function index bitcode from file : %s",
+            EC.message().c_str());
+
+  object::FunctionIndexObjectFile &Obj = **ObjOrErr;
+
+  return Obj.takeIndex();
+}
+
 static std::unique_ptr<Module>
 getModuleForFile(LLVMContext &Context, claimed_file &F,
                  ld_plugin_input_file &Info, raw_fd_ostream *ApiFile,
@@ -857,6 +892,35 @@ static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
   LLVMContext Context;
   Context.setDiagnosticHandler(diagnosticHandler, nullptr, true);
 
+  // If we are doing ThinLTO compilation, simply build the combined
+  // function index/summary and emit it. We don't need to parse the modules
+  // and link them in this case.
+  if (options::thinlto) {
+    std::unique_ptr<FunctionInfoIndex> CombinedIndex(new FunctionInfoIndex());
+    uint64_t NextModuleId = 0;
+    for (claimed_file &F : Modules) {
+      ld_plugin_input_file File;
+      if (get_input_file(F.handle, &File) != LDPS_OK)
+        message(LDPL_FATAL, "Failed to get file information");
+
+      std::unique_ptr<FunctionInfoIndex> Index =
+          getFunctionIndexForFile(Context, F, File);
+      CombinedIndex->mergeFrom(std::move(Index), ++NextModuleId);
+    }
+
+    std::error_code EC;
+    raw_fd_ostream OS(output_name + ".thinlto.bc", EC,
+                      sys::fs::OpenFlags::F_None);
+    if (EC)
+      message(LDPL_FATAL, "Unable to open %s.thinlto.bc for writing: %s",
+              output_name.data(), EC.message().c_str());
+    WriteFunctionSummaryToFile(CombinedIndex.get(), OS);
+    OS.close();
+
+    cleanup_hook();
+    exit(0);
+  }
+
   std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
   Linker L(Combined.get());
 

diff --git a/llvm/tools/llvm-as/llvm-as.cpp b/llvm/tools/llvm-as/llvm-as.cpp
@@ -44,6 +44,10 @@ Force("f", cl::desc("Enable binary output on terminals"));
 static cl::opt<bool>
 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
 
+static cl::opt<bool>
+EmitFunctionSummary("function-summary", cl::desc("Emit function summary index"),
+                    cl::init(false));
+
 static cl::opt<bool>
 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
 
@@ -77,7 +81,8 @@ static void WriteOutputFile(const Module *M) {
   }
 
   if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
-    WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder);
+    WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder,
+                       EmitFunctionSummary);
 
   // Declare success.
   Out->keep();

diff --git a/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -114,6 +114,9 @@ static const char *GetBlockName(unsigned BlockID,
   case bitc::METADATA_BLOCK_ID:        return "METADATA_BLOCK";
   case bitc::METADATA_ATTACHMENT_ID:   return "METADATA_ATTACHMENT_BLOCK";
   case bitc::USELIST_BLOCK_ID:         return "USELIST_BLOCK_ID";
+  case bitc::FUNCTION_SUMMARY_BLOCK_ID:
+                                       return "FUNCTION_SUMMARY_BLOCK";
+  case bitc::MODULE_STRTAB_BLOCK_ID:   return "MODULE_STRTAB_BLOCK";
   }
 }
 
@@ -268,6 +271,18 @@ static const char *GetCodeName(unsigned CodeID, unsigned BlockID,
     STRINGIFY_CODE(VST_CODE, ENTRY)
     STRINGIFY_CODE(VST_CODE, BBENTRY)
     STRINGIFY_CODE(VST_CODE, FNENTRY)
+    STRINGIFY_CODE(VST_CODE, COMBINED_FNENTRY)
+    }
+  case bitc::MODULE_STRTAB_BLOCK_ID:
+    switch (CodeID) {
+    default: return nullptr;
+    STRINGIFY_CODE(MST_CODE, ENTRY)
+    }
+  case bitc::FUNCTION_SUMMARY_BLOCK_ID:
+    switch (CodeID) {
+    default: return nullptr;
+    STRINGIFY_CODE(FS_CODE, PERMODULE_ENTRY)
+    STRINGIFY_CODE(FS_CODE, COMBINED_ENTRY)
     }
   case bitc::METADATA_ATTACHMENT_ID:
     switch(CodeID) {