Move LTO support library to a component, allowing it to be tested

more reliably across platforms.  Patch by Tom Roeder!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191343 91177308-0d34-0410-b5e6-96231b3b80d8

7 files changed, 27 insertions, 1692 deletions

diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
index c71aac1..8b26ddd 100644
--- a/tools/lto/CMakeLists.txt
+++ b/tools/lto/CMakeLists.txt
@@ -1,14 +1,12 @@
 set(LLVM_LINK_COMPONENTS
   ${LLVM_TARGETS_TO_BUILD}
-  ipo scalaropts linker bitreader bitwriter mcdisassembler vectorize)
+  ipo scalaropts linker bitreader bitwriter lto mcdisassembler vectorize)
 
 add_definitions( -DLLVM_VERSION_INFO=\"${PACKAGE_VERSION}\" )
 
 set(SOURCES
-  LTOCodeGenerator.cpp
   LTODisassembler.cpp
   lto.cpp
-  LTOModule.cpp
   )
 
 if( NOT WIN32 AND LLVM_ENABLE_PIC )
diff --git a/tools/lto/LTOCodeGenerator.cpp b/tools/lto/LTOCodeGenerator.cpp
deleted file mode 100644
index 19e8c4c..0000000
--- a/tools/lto/LTOCodeGenerator.cpp
+++ /dev/null
@@ -1,458 +0,0 @@
-//===-LTOCodeGenerator.cpp - LLVM Link Time Optimizer ---------------------===//
-//
-//                     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 Link Time Optimization library. This library is
-// intended to be used by linker to optimize code at link time.
-//
-//===----------------------------------------------------------------------===//
-
-#include "LTOCodeGenerator.h"
-#include "LTOModule.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/Analysis/Passes.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/Config/config.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Module.h"
-#include "llvm/InitializePasses.h"
-#include "llvm/Linker.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/SubtargetFeature.h"
-#include "llvm/PassManager.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/Host.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Signals.h"
-#include "llvm/Support/TargetRegistry.h"
-#include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/system_error.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/IPO/PassManagerBuilder.h"
-#include "llvm/Transforms/ObjCARC.h"
-using namespace llvm;
-
-static cl::opt<bool>
-DisableOpt("disable-opt", cl::init(false),
-  cl::desc("Do not run any optimization passes"));
-
-static cl::opt<bool>
-DisableInline("disable-inlining", cl::init(false),
-  cl::desc("Do not run the inliner pass"));
-
-static cl::opt<bool>
-DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
-  cl::desc("Do not run the GVN load PRE pass"));
-
-const char* LTOCodeGenerator::getVersionString() {
-#ifdef LLVM_VERSION_INFO
-  return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
-#else
-  return PACKAGE_NAME " version " PACKAGE_VERSION;
-#endif
-}
-
-LTOCodeGenerator::LTOCodeGenerator()
-    : Context(getGlobalContext()), Linker(new Module("ld-temp.o", Context)),
-      TargetMach(NULL), EmitDwarfDebugInfo(false), ScopeRestrictionsDone(false),
-      CodeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC), NativeObjectFile(NULL) {
-  InitializeAllTargets();
-  InitializeAllTargetMCs();
-  InitializeAllAsmPrinters();
-  initializeLTOPasses();
-}
-
-LTOCodeGenerator::~LTOCodeGenerator() {
-  delete TargetMach;
-  delete NativeObjectFile;
-  delete Linker.getModule();
-
-  for (std::vector<char *>::iterator I = CodegenOptions.begin(),
-                                     E = CodegenOptions.end();
-       I != E; ++I)
-    free(*I);
-}
-
-// Initialize LTO passes. Please keep this funciton in sync with
-// PassManagerBuilder::populateLTOPassManager(), and make sure all LTO
-// passes are initialized. 
-//
-void LTOCodeGenerator::initializeLTOPasses() {
-  PassRegistry &R = *PassRegistry::getPassRegistry();
-
-  initializeInternalizePassPass(R);
-  initializeIPSCCPPass(R);
-  initializeGlobalOptPass(R);
-  initializeConstantMergePass(R);
-  initializeDAHPass(R);
-  initializeInstCombinerPass(R);
-  initializeSimpleInlinerPass(R);
-  initializePruneEHPass(R);
-  initializeGlobalDCEPass(R);
-  initializeArgPromotionPass(R);
-  initializeJumpThreadingPass(R);
-  initializeSROAPass(R);
-  initializeSROA_DTPass(R);
-  initializeSROA_SSAUpPass(R);
-  initializeFunctionAttrsPass(R);
-  initializeGlobalsModRefPass(R);
-  initializeLICMPass(R);
-  initializeGVNPass(R);
-  initializeMemCpyOptPass(R);
-  initializeDCEPass(R);
-  initializeCFGSimplifyPassPass(R);
-}
-
-bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg) {
-  bool ret = Linker.linkInModule(mod->getLLVVMModule(), &errMsg);
-
-  const std::vector<const char*> &undefs = mod->getAsmUndefinedRefs();
-  for (int i = 0, e = undefs.size(); i != e; ++i)
-    AsmUndefinedRefs[undefs[i]] = 1;
-
-  return !ret;
-}
-
-void LTOCodeGenerator::setDebugInfo(lto_debug_model debug) {
-  switch (debug) {
-  case LTO_DEBUG_MODEL_NONE:
-    EmitDwarfDebugInfo = false;
-    return;
-
-  case LTO_DEBUG_MODEL_DWARF:
-    EmitDwarfDebugInfo = true;
-    return;
-  }
-  llvm_unreachable("Unknown debug format!");
-}
-
-void LTOCodeGenerator::setCodePICModel(lto_codegen_model model) {
-  switch (model) {
-  case LTO_CODEGEN_PIC_MODEL_STATIC:
-  case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
-  case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
-    CodeModel = model;
-    return;
-  }
-  llvm_unreachable("Unknown PIC model!");
-}
-
-bool LTOCodeGenerator::writeMergedModules(const char *path,
-                                          std::string &errMsg) {
-  if (!determineTarget(errMsg))
-    return false;
-
-  // mark which symbols can not be internalized
-  applyScopeRestrictions();
-
-  // create output file
-  std::string ErrInfo;
-  tool_output_file Out(path, ErrInfo, sys::fs::F_Binary);
-  if (!ErrInfo.empty()) {
-    errMsg = "could not open bitcode file for writing: ";
-    errMsg += path;
-    return false;
-  }
-
-  // write bitcode to it
-  WriteBitcodeToFile(Linker.getModule(), Out.os());
-  Out.os().close();
-
-  if (Out.os().has_error()) {
-    errMsg = "could not write bitcode file: ";
-    errMsg += path;
-    Out.os().clear_error();
-    return false;
-  }
-
-  Out.keep();
-  return true;
-}
-
-bool LTOCodeGenerator::compile_to_file(const char** name, std::string& errMsg) {
-  // make unique temp .o file to put generated object file
-  SmallString<128> Filename;
-  int FD;
-  error_code EC = sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
-  if (EC) {
-    errMsg = EC.message();
-    return false;
-  }
-
-  // generate object file
-  tool_output_file objFile(Filename.c_str(), FD);
-
-  bool genResult = generateObjectFile(objFile.os(), errMsg);
-  objFile.os().close();
-  if (objFile.os().has_error()) {
-    objFile.os().clear_error();
-    sys::fs::remove(Twine(Filename));
-    return false;
-  }
-
-  objFile.keep();
-  if (!genResult) {
-    sys::fs::remove(Twine(Filename));
-    return false;
-  }
-
-  NativeObjectPath = Filename.c_str();
-  *name = NativeObjectPath.c_str();
-  return true;
-}
-
-const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg) {
-  const char *name;
-  if (!compile_to_file(&name, errMsg))
-    return NULL;
-
-  // remove old buffer if compile() called twice
-  delete NativeObjectFile;
-
-  // read .o file into memory buffer
-  OwningPtr<MemoryBuffer> BuffPtr;
-  if (error_code ec = MemoryBuffer::getFile(name, BuffPtr, -1, false)) {
-    errMsg = ec.message();
-    sys::fs::remove(NativeObjectPath);
-    return NULL;
-  }
-  NativeObjectFile = BuffPtr.take();
-
-  // remove temp files
-  sys::fs::remove(NativeObjectPath);
-
-  // return buffer, unless error
-  if (NativeObjectFile == NULL)
-    return NULL;
-  *length = NativeObjectFile->getBufferSize();
-  return NativeObjectFile->getBufferStart();
-}
-
-bool LTOCodeGenerator::determineTarget(std::string &errMsg) {
-  if (TargetMach != NULL)
-    return true;
-
-  // if options were requested, set them
-  if (!CodegenOptions.empty())
-    cl::ParseCommandLineOptions(CodegenOptions.size(),
-                                const_cast<char **>(&CodegenOptions[0]));
-
-  std::string TripleStr = Linker.getModule()->getTargetTriple();
-  if (TripleStr.empty())
-    TripleStr = sys::getDefaultTargetTriple();
-  llvm::Triple Triple(TripleStr);
-
-  // create target machine from info for merged modules
-  const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
-  if (march == NULL)
-    return false;
-
-  // The relocation model is actually a static member of TargetMachine and
-  // needs to be set before the TargetMachine is instantiated.
-  Reloc::Model RelocModel = Reloc::Default;
-  switch (CodeModel) {
-  case LTO_CODEGEN_PIC_MODEL_STATIC:
-    RelocModel = Reloc::Static;
-    break;
-  case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
-    RelocModel = Reloc::PIC_;
-    break;
-  case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
-    RelocModel = Reloc::DynamicNoPIC;
-    break;
-  }
-
-  // construct LTOModule, hand over ownership of module and target
-  SubtargetFeatures Features;
-  Features.getDefaultSubtargetFeatures(Triple);
-  std::string FeatureStr = Features.getString();
-  // Set a default CPU for Darwin triples.
-  if (MCpu.empty() && Triple.isOSDarwin()) {
-    if (Triple.getArch() == llvm::Triple::x86_64)
-      MCpu = "core2";
-    else if (Triple.getArch() == llvm::Triple::x86)
-      MCpu = "yonah";
-  }
-  TargetOptions Options;
-  LTOModule::getTargetOptions(Options);
-  TargetMach = march->createTargetMachine(TripleStr, MCpu, FeatureStr, Options,
-                                          RelocModel, CodeModel::Default,
-                                          CodeGenOpt::Aggressive);
-  return true;
-}
-
-void LTOCodeGenerator::
-applyRestriction(GlobalValue &GV,
-                 std::vector<const char*> &MustPreserveList,
-                 SmallPtrSet<GlobalValue*, 8> &AsmUsed,
-                 Mangler &Mangler) {
-  SmallString<64> Buffer;
-  Mangler.getNameWithPrefix(Buffer, &GV, false);
-
-  if (GV.isDeclaration())
-    return;
-  if (MustPreserveSymbols.count(Buffer))
-    MustPreserveList.push_back(GV.getName().data());
-  if (AsmUndefinedRefs.count(Buffer))
-    AsmUsed.insert(&GV);
-}
-
-static void findUsedValues(GlobalVariable *LLVMUsed,
-                           SmallPtrSet<GlobalValue*, 8> &UsedValues) {
-  if (LLVMUsed == 0) return;
-
-  ConstantArray *Inits = cast<ConstantArray>(LLVMUsed->getInitializer());
-  for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
-    if (GlobalValue *GV =
-        dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
-      UsedValues.insert(GV);
-}
-
-void LTOCodeGenerator::applyScopeRestrictions() {
-  if (ScopeRestrictionsDone)
-    return;
-  Module *mergedModule = Linker.getModule();
-
-  // Start off with a verification pass.
-  PassManager passes;
-  passes.add(createVerifierPass());
-
-  // mark which symbols can not be internalized
-  MCContext MContext(TargetMach->getMCAsmInfo(), TargetMach->getRegisterInfo(),
-                     NULL);
-  Mangler Mangler(MContext, TargetMach);
-  std::vector<const char*> MustPreserveList;
-  SmallPtrSet<GlobalValue*, 8> AsmUsed;
-
-  for (Module::iterator f = mergedModule->begin(),
-         e = mergedModule->end(); f != e; ++f)
-    applyRestriction(*f, MustPreserveList, AsmUsed, Mangler);
-  for (Module::global_iterator v = mergedModule->global_begin(),
-         e = mergedModule->global_end(); v !=  e; ++v)
-    applyRestriction(*v, MustPreserveList, AsmUsed, Mangler);
-  for (Module::alias_iterator a = mergedModule->alias_begin(),
-         e = mergedModule->alias_end(); a != e; ++a)
-    applyRestriction(*a, MustPreserveList, AsmUsed, Mangler);
-
-  GlobalVariable *LLVMCompilerUsed =
-    mergedModule->getGlobalVariable("llvm.compiler.used");
-  findUsedValues(LLVMCompilerUsed, AsmUsed);
-  if (LLVMCompilerUsed)
-    LLVMCompilerUsed->eraseFromParent();
-
-  if (!AsmUsed.empty()) {
-    llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(Context);
-    std::vector<Constant*> asmUsed2;
-    for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = AsmUsed.begin(),
-           e = AsmUsed.end(); i !=e; ++i) {
-      GlobalValue *GV = *i;
-      Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
-      asmUsed2.push_back(c);
-    }
-
-    llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
-    LLVMCompilerUsed =
-      new llvm::GlobalVariable(*mergedModule, ATy, false,
-                               llvm::GlobalValue::AppendingLinkage,
-                               llvm::ConstantArray::get(ATy, asmUsed2),
-                               "llvm.compiler.used");
-
-    LLVMCompilerUsed->setSection("llvm.metadata");
-  }
-
-  passes.add(createInternalizePass(MustPreserveList));
-
-  // apply scope restrictions
-  passes.run(*mergedModule);
-
-  ScopeRestrictionsDone = true;
-}
-
-/// Optimize merged modules using various IPO passes
-bool LTOCodeGenerator::generateObjectFile(raw_ostream &out,
-                                          std::string &errMsg) {
-  if (!this->determineTarget(errMsg))
-    return false;
-
-  Module *mergedModule = Linker.getModule();
-
-  // Mark which symbols can not be internalized
-  this->applyScopeRestrictions();
-
-  // Instantiate the pass manager to organize the passes.
-  PassManager passes;
-
-  // Start off with a verification pass.
-  passes.add(createVerifierPass());
-
-  // Add an appropriate DataLayout instance for this module...
-  passes.add(new DataLayout(*TargetMach->getDataLayout()));
-  TargetMach->addAnalysisPasses(passes);
-
-  // Enabling internalize here would use its AllButMain variant. It
-  // keeps only main if it exists and does nothing for libraries. Instead
-  // we create the pass ourselves with the symbol list provided by the linker.
-  if (!DisableOpt)
-    PassManagerBuilder().populateLTOPassManager(passes,
-                                              /*Internalize=*/false,
-                                              !DisableInline,
-                                              DisableGVNLoadPRE);
-
-  // Make sure everything is still good.
-  passes.add(createVerifierPass());
-
-  PassManager codeGenPasses;
-
-  codeGenPasses.add(new DataLayout(*TargetMach->getDataLayout()));
-  TargetMach->addAnalysisPasses(codeGenPasses);
-
-  formatted_raw_ostream Out(out);
-
-  // If the bitcode files contain ARC code and were compiled with optimization,
-  // the ObjCARCContractPass must be run, so do it unconditionally here.
-  codeGenPasses.add(createObjCARCContractPass());
-
-  if (TargetMach->addPassesToEmitFile(codeGenPasses, Out,
-                                      TargetMachine::CGFT_ObjectFile)) {
-    errMsg = "target file type not supported";
-    return false;
-  }
-
-  // Run our queue of passes all at once now, efficiently.
-  passes.run(*mergedModule);
-
-  // Run the code generator, and write assembly file
-  codeGenPasses.run(*mergedModule);
-
-  return true;
-}
-
-/// setCodeGenDebugOptions - Set codegen debugging options to aid in debugging
-/// LTO problems.
-void LTOCodeGenerator::setCodeGenDebugOptions(const char *options) {
-  for (std::pair<StringRef, StringRef> o = getToken(options);
-       !o.first.empty(); o = getToken(o.second)) {
-    // ParseCommandLineOptions() expects argv[0] to be program name. Lazily add
-    // that.
-    if (CodegenOptions.empty())
-      CodegenOptions.push_back(strdup("libLTO"));
-    CodegenOptions.push_back(strdup(o.first.str().c_str()));
-  }
-}
diff --git a/tools/lto/LTOCodeGenerator.h b/tools/lto/LTOCodeGenerator.h
deleted file mode 100644
index 0263362..0000000
--- a/tools/lto/LTOCodeGenerator.h
+++ /dev/null
@@ -1,130 +0,0 @@
-//===-LTOCodeGenerator.h - LLVM Link Time Optimizer -----------------------===//
-//
-//                     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 LTOCodeGenerator class.
-//
-//   LTO compilation consists of three phases: Pre-IPO, IPO and Post-IPO. 
-//
-//   The Pre-IPO phase compiles source code into bitcode file. The resulting
-// bitcode files, along with object files and libraries, will be fed to the
-// linker to through the IPO and Post-IPO phases. By using obj-file extension,
-// the resulting bitcode file disguises itself as an object file, and therefore
-// obviates the need of writing a special set of the make-rules only for LTO
-// compilation.
-//
-//   The IPO phase perform inter-procedural analyses and optimizations, and
-// the Post-IPO consists two sub-phases: intra-procedural scalar optimizations
-// (SOPT), and intra-procedural target-dependent code generator (CG).
-// 
-//   As of this writing, we don't separate IPO and the Post-IPO SOPT. They
-// are intermingled together, and are driven by a single pass manager (see
-// PassManagerBuilder::populateLTOPassManager()).
-// 
-//   The "LTOCodeGenerator" is the driver for the IPO and Post-IPO stages. 
-// The "CodeGenerator" here is bit confusing. Don't confuse the "CodeGenerator"
-// with the machine specific code generator.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LTO_CODE_GENERATOR_H
-#define LTO_CODE_GENERATOR_H
-
-#include "llvm-c/lto.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/Linker.h"
-#include <string>
-#include <vector>
-
-namespace llvm {
-  class LLVMContext;
-  class GlobalValue;
-  class Mangler;
-  class MemoryBuffer;
-  class TargetMachine;
-  class raw_ostream;
-}
-
-//===----------------------------------------------------------------------===//
-/// LTOCodeGenerator - C++ class which implements the opaque lto_code_gen_t
-/// type.
-///
-struct LTOCodeGenerator {
-  static const char *getVersionString();
-
-  LTOCodeGenerator();
-  ~LTOCodeGenerator();
-
-  // Merge given module, return true on success.
-  bool addModule(struct LTOModule*, std::string &errMsg);
-
-  void setDebugInfo(lto_debug_model);
-  void setCodePICModel(lto_codegen_model);
-
-  void setCpu(const char *mCpu) { MCpu = mCpu; }
-
-  void addMustPreserveSymbol(const char *sym) { MustPreserveSymbols[sym] = 1; }
-
-  // To pass options to the driver and optimization passes. These options are
-  // not necessarily for debugging purpose (The function name is misleading).
-  // This function should be called before LTOCodeGenerator::compilexxx(),
-  // and LTOCodeGenerator::writeMergedModules().
-  //
-  void setCodeGenDebugOptions(const char *opts);
-
-  // Write the merged module to the file specified by the given path.
-  // Return true on success.
-  bool writeMergedModules(const char *path, std::string &errMsg);
-
-  // Compile the merged module into a *single* object file; the path to object
-  // file is returned to the caller via argument "name". Return true on
-  // success.
-  //
-  // NOTE that it is up to the linker to remove the intermediate object file.
-  //  Do not try to remove the object file in LTOCodeGenerator's destructor
-  //  as we don't who (LTOCodeGenerator or the obj file) will last longer.
-  // 
-  bool compile_to_file(const char **name, std::string &errMsg);
-
-  // As with compile_to_file(), this function compiles the merged module into
-  // single object file. Instead of returning the object-file-path to the caller
-  // (linker), it brings the object to a buffer, and return the buffer to the
-  // caller. This function should delete intermediate object file once its content
-  // is brought to memory. Return NULL is the compilation was not successful. 
-  //
-  const void *compile(size_t *length, std::string &errMsg);
-
-private:
-  void initializeLTOPasses();
-
-  bool generateObjectFile(llvm::raw_ostream &out, std::string &errMsg);
-  void applyScopeRestrictions();
-  void applyRestriction(llvm::GlobalValue &GV,
-                        std::vector<const char*> &MustPreserveList,
-                        llvm::SmallPtrSet<llvm::GlobalValue*, 8> &AsmUsed,
-                        llvm::Mangler &Mangler);
-  bool determineTarget(std::string &errMsg);
-
-  typedef llvm::StringMap<uint8_t> StringSet;
-
-  llvm::LLVMContext &Context;
-  llvm::Linker Linker;
-  llvm::TargetMachine *TargetMach;
-  bool EmitDwarfDebugInfo;
-  bool ScopeRestrictionsDone;
-  lto_codegen_model CodeModel;
-  StringSet MustPreserveSymbols;
-  StringSet AsmUndefinedRefs;
-  llvm::MemoryBuffer *NativeObjectFile;
-  std::vector<char *> CodegenOptions;
-  std::string MCpu;
-  std::string NativeObjectPath;
-};
-
-#endif // LTO_CODE_GENERATOR_H
diff --git a/tools/lto/LTOModule.cpp b/tools/lto/LTOModule.cpp
deleted file mode 100644
index 87e3573..0000000
--- a/tools/lto/LTOModule.cpp
+++ /dev/null
@@ -1,908 +0,0 @@
-//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
-//
-//                     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 Link Time Optimization library. This library is
-// intended to be used by linker to optimize code at link time.
-//
-//===----------------------------------------------------------------------===//
-
-#include "LTOModule.h"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/Triple.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Module.h"
-#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCInst.h"
-#include "llvm/MC/MCInstrInfo.h"
-#include "llvm/MC/MCParser/MCAsmParser.h"
-#include "llvm/MC/MCStreamer.h"
-#include "llvm/MC/MCSubtargetInfo.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCTargetAsmParser.h"
-#include "llvm/MC/SubtargetFeature.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Host.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/TargetRegistry.h"
-#include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/system_error.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-using namespace llvm;
-
-static cl::opt<bool>
-EnableFPMAD("enable-fp-mad",
-  cl::desc("Enable less precise MAD instructions to be generated"),
-  cl::init(false));
-
-static cl::opt<bool>
-DisableFPElim("disable-fp-elim",
-  cl::desc("Disable frame pointer elimination optimization"),
-  cl::init(false));
-
-static cl::opt<bool>
-EnableUnsafeFPMath("enable-unsafe-fp-math",
-  cl::desc("Enable optimizations that may decrease FP precision"),
-  cl::init(false));
-
-static cl::opt<bool>
-EnableNoInfsFPMath("enable-no-infs-fp-math",
-  cl::desc("Enable FP math optimizations that assume no +-Infs"),
-  cl::init(false));
-
-static cl::opt<bool>
-EnableNoNaNsFPMath("enable-no-nans-fp-math",
-  cl::desc("Enable FP math optimizations that assume no NaNs"),
-  cl::init(false));
-
-static cl::opt<bool>
-EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
-  cl::Hidden,
-  cl::desc("Force codegen to assume rounding mode can change dynamically"),
-  cl::init(false));
-
-static cl::opt<bool>
-GenerateSoftFloatCalls("soft-float",
-  cl::desc("Generate software floating point library calls"),
-  cl::init(false));
-
-static cl::opt<llvm::FloatABI::ABIType>
-FloatABIForCalls("float-abi",
-  cl::desc("Choose float ABI type"),
-  cl::init(FloatABI::Default),
-  cl::values(
-    clEnumValN(FloatABI::Default, "default",
-               "Target default float ABI type"),
-    clEnumValN(FloatABI::Soft, "soft",
-               "Soft float ABI (implied by -soft-float)"),
-    clEnumValN(FloatABI::Hard, "hard",
-               "Hard float ABI (uses FP registers)"),
-    clEnumValEnd));
-
-static cl::opt<llvm::FPOpFusion::FPOpFusionMode>
-FuseFPOps("fp-contract",
-  cl::desc("Enable aggresive formation of fused FP ops"),
-  cl::init(FPOpFusion::Standard),
-  cl::values(
-    clEnumValN(FPOpFusion::Fast, "fast",
-               "Fuse FP ops whenever profitable"),
-    clEnumValN(FPOpFusion::Standard, "on",
-               "Only fuse 'blessed' FP ops."),
-    clEnumValN(FPOpFusion::Strict, "off",
-               "Only fuse FP ops when the result won't be effected."),
-    clEnumValEnd));
-
-static cl::opt<bool>
-DontPlaceZerosInBSS("nozero-initialized-in-bss",
-  cl::desc("Don't place zero-initialized symbols into bss section"),
-  cl::init(false));
-
-static cl::opt<bool>
-EnableGuaranteedTailCallOpt("tailcallopt",
-  cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
-  cl::init(false));
-
-static cl::opt<bool>
-DisableTailCalls("disable-tail-calls",
-  cl::desc("Never emit tail calls"),
-  cl::init(false));
-
-static cl::opt<unsigned>
-OverrideStackAlignment("stack-alignment",
-  cl::desc("Override default stack alignment"),
-  cl::init(0));
-
-static cl::opt<std::string>
-TrapFuncName("trap-func", cl::Hidden,
-  cl::desc("Emit a call to trap function rather than a trap instruction"),
-  cl::init(""));
-
-static cl::opt<bool>
-EnablePIE("enable-pie",
-  cl::desc("Assume the creation of a position independent executable."),
-  cl::init(false));
-
-static cl::opt<bool>
-SegmentedStacks("segmented-stacks",
-  cl::desc("Use segmented stacks if possible."),
-  cl::init(false));
-
-static cl::opt<bool>
-UseInitArray("use-init-array",
-  cl::desc("Use .init_array instead of .ctors."),
-  cl::init(false));
-
-LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
-  : _module(m), _target(t),
-    _context(_target->getMCAsmInfo(), _target->getRegisterInfo(), NULL),
-    _mangler(_context, t) {}
-
-/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
-/// bitcode.
-bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
-  return sys::fs::identify_magic(StringRef((const char *)mem, length)) ==
-         sys::fs::file_magic::bitcode;
-}
-
-bool LTOModule::isBitcodeFile(const char *path) {
-  sys::fs::file_magic type;
-  if (sys::fs::identify_magic(path, type))
-    return false;
-  return type == sys::fs::file_magic::bitcode;
-}
-
-/// isBitcodeFileForTarget - Returns 'true' if the file (or memory contents) is
-/// LLVM bitcode for the specified triple.
-bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
-                                       const char *triplePrefix) {
-  MemoryBuffer *buffer = makeBuffer(mem, length);
-  if (!buffer)
-    return false;
-  return isTargetMatch(buffer, triplePrefix);
-}
-
-bool LTOModule::isBitcodeFileForTarget(const char *path,
-                                       const char *triplePrefix) {
-  OwningPtr<MemoryBuffer> buffer;
-  if (MemoryBuffer::getFile(path, buffer))
-    return false;
-  return isTargetMatch(buffer.take(), triplePrefix);
-}
-
-/// isTargetMatch - Returns 'true' if the memory buffer is for the specified
-/// target triple.
-bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
-  std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
-  delete buffer;
-  return strncmp(Triple.c_str(), triplePrefix, strlen(triplePrefix)) == 0;
-}
-
-/// makeLTOModule - Create an LTOModule. N.B. These methods take ownership of
-/// the buffer.
-LTOModule *LTOModule::makeLTOModule(const char *path, std::string &errMsg) {
-  OwningPtr<MemoryBuffer> buffer;
-  if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
-    errMsg = ec.message();
-    return NULL;
-  }
-  return makeLTOModule(buffer.take(), errMsg);
-}
-
-LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
-                                    size_t size, std::string &errMsg) {
-  return makeLTOModule(fd, path, size, 0, errMsg);
-}
-
-LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
-                                    size_t map_size,
-                                    off_t offset,
-                                    std::string &errMsg) {
-  OwningPtr<MemoryBuffer> buffer;
-  if (error_code ec =
-          MemoryBuffer::getOpenFileSlice(fd, path, buffer, map_size, offset)) {
-    errMsg = ec.message();
-    return NULL;
-  }
-  return makeLTOModule(buffer.take(), errMsg);
-}
-
-LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
-                                    std::string &errMsg) {
-  OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
-  if (!buffer)
-    return NULL;
-  return makeLTOModule(buffer.take(), errMsg);
-}
-
-void LTOModule::getTargetOptions(TargetOptions &Options) {
-  Options.LessPreciseFPMADOption = EnableFPMAD;
-  Options.NoFramePointerElim = DisableFPElim;
-  Options.AllowFPOpFusion = FuseFPOps;
-  Options.UnsafeFPMath = EnableUnsafeFPMath;
-  Options.NoInfsFPMath = EnableNoInfsFPMath;
-  Options.NoNaNsFPMath = EnableNoNaNsFPMath;
-  Options.HonorSignDependentRoundingFPMathOption =
-    EnableHonorSignDependentRoundingFPMath;
-  Options.UseSoftFloat = GenerateSoftFloatCalls;
-  if (FloatABIForCalls != FloatABI::Default)
-    Options.FloatABIType = FloatABIForCalls;
-  Options.NoZerosInBSS = DontPlaceZerosInBSS;
-  Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
-  Options.DisableTailCalls = DisableTailCalls;
-  Options.StackAlignmentOverride = OverrideStackAlignment;
-  Options.TrapFuncName = TrapFuncName;
-  Options.PositionIndependentExecutable = EnablePIE;
-  Options.EnableSegmentedStacks = SegmentedStacks;
-  Options.UseInitArray = UseInitArray;
-}
-
-LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
-                                    std::string &errMsg) {
-  static bool Initialized = false;
-  if (!Initialized) {
-    InitializeAllTargets();
-    InitializeAllTargetMCs();
-    InitializeAllAsmParsers();
-    Initialized = true;
-  }
-
-  // parse bitcode buffer
-  OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext(),
-                                           &errMsg));
-  if (!m) {
-    delete buffer;
-    return NULL;
-  }
-
-  std::string TripleStr = m->getTargetTriple();
-  if (TripleStr.empty())
-    TripleStr = sys::getDefaultTargetTriple();
-  llvm::Triple Triple(TripleStr);
-
-  // find machine architecture for this module
-  const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
-  if (!march)
-    return NULL;
-
-  // construct LTOModule, hand over ownership of module and target
-  SubtargetFeatures Features;
-  Features.getDefaultSubtargetFeatures(Triple);
-  std::string FeatureStr = Features.getString();
-  // Set a default CPU for Darwin triples.
-  std::string CPU;
-  if (Triple.isOSDarwin()) {
-    if (Triple.getArch() == llvm::Triple::x86_64)
-      CPU = "core2";
-    else if (Triple.getArch() == llvm::Triple::x86)
-      CPU = "yonah";
-  }
-  TargetOptions Options;
-  getTargetOptions(Options);
-  TargetMachine *target = march->createTargetMachine(TripleStr, CPU, FeatureStr,
-                                                     Options);
-  LTOModule *Ret = new LTOModule(m.take(), target);
-  if (Ret->parseSymbols(errMsg)) {
-    delete Ret;
-    return NULL;
-  }
-
-  return Ret;
-}
-
-/// makeBuffer - Create a MemoryBuffer from a memory range.
-MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
-  const char *startPtr = (const char*)mem;
-  return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
-}
-
-/// objcClassNameFromExpression - Get string that the data pointer points to.
-bool
-LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
-  if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
-    Constant *op = ce->getOperand(0);
-    if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
-      Constant *cn = gvn->getInitializer();
-      if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
-        if (ca->isCString()) {
-          name = ".objc_class_name_" + ca->getAsCString().str();
-          return true;
-        }
-      }
-    }
-  }
-  return false;
-}
-
-/// addObjCClass - Parse i386/ppc ObjC class data structure.
-void LTOModule::addObjCClass(const GlobalVariable *clgv) {
-  const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
-  if (!c) return;
-
-  // second slot in __OBJC,__class is pointer to superclass name
-  std::string superclassName;
-  if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
-    NameAndAttributes info;
-    StringMap<NameAndAttributes>::value_type &entry =
-      _undefines.GetOrCreateValue(superclassName);
-    if (!entry.getValue().name) {
-      const char *symbolName = entry.getKey().data();
-      info.name = symbolName;
-      info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
-      info.isFunction = false;
-      info.symbol = clgv;
-      entry.setValue(info);
-    }
-  }
-
-  // third slot in __OBJC,__class is pointer to class name
-  std::string className;
-  if (objcClassNameFromExpression(c->getOperand(2), className)) {
-    StringSet::value_type &entry = _defines.GetOrCreateValue(className);
-    entry.setValue(1);
-
-    NameAndAttributes info;
-    info.name = entry.getKey().data();
-    info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
-      LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
-    info.isFunction = false;
-    info.symbol = clgv;
-    _symbols.push_back(info);
-  }
-}
-
-/// addObjCCategory - Parse i386/ppc ObjC category data structure.
-void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
-  const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
-  if (!c) return;
-
-  // second slot in __OBJC,__category is pointer to target class name
-  std::string targetclassName;
-  if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
-    return;
-
-  NameAndAttributes info;
-  StringMap<NameAndAttributes>::value_type &entry =
-    _undefines.GetOrCreateValue(targetclassName);
-
-  if (entry.getValue().name)
-    return;
-
-  const char *symbolName = entry.getKey().data();
-  info.name = symbolName;
-  info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
-  info.isFunction = false;
-  info.symbol = clgv;
-  entry.setValue(info);
-}
-
-/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
-void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
-  std::string targetclassName;
-  if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
-    return;
-
-  NameAndAttributes info;
-  StringMap<NameAndAttributes>::value_type &entry =
-    _undefines.GetOrCreateValue(targetclassName);
-  if (entry.getValue().name)
-    return;
-
-  const char *symbolName = entry.getKey().data();
-  info.name = symbolName;
-  info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
-  info.isFunction = false;
-  info.symbol = clgv;
-  entry.setValue(info);
-}
-
-/// addDefinedDataSymbol - Add a data symbol as defined to the list.
-void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
-  // Add to list of defined symbols.
-  addDefinedSymbol(v, false);
-
-  if (!v->hasSection() /* || !isTargetDarwin */)
-    return;
-
-  // Special case i386/ppc ObjC data structures in magic sections:
-  // The issue is that the old ObjC object format did some strange
-  // contortions to avoid real linker symbols.  For instance, the
-  // ObjC class data structure is allocated statically in the executable
-  // that defines that class.  That data structures contains a pointer to
-  // its superclass.  But instead of just initializing that part of the
-  // struct to the address of its superclass, and letting the static and
-  // dynamic linkers do the rest, the runtime works by having that field
-  // instead point to a C-string that is the name of the superclass.
-  // At runtime the objc initialization updates that pointer and sets
-  // it to point to the actual super class.  As far as the linker
-  // knows it is just a pointer to a string.  But then someone wanted the
-  // linker to issue errors at build time if the superclass was not found.
-  // So they figured out a way in mach-o object format to use an absolute
-  // symbols (.objc_class_name_Foo = 0) and a floating reference
-  // (.reference .objc_class_name_Bar) to cause the linker into erroring when
-  // a class was missing.
-  // The following synthesizes the implicit .objc_* symbols for the linker
-  // from the ObjC data structures generated by the front end.
-
-  // special case if this data blob is an ObjC class definition
-  if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
-    if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
-      addObjCClass(gv);
-    }
-  }
-
-  // special case if this data blob is an ObjC category definition
-  else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
-    if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
-      addObjCCategory(gv);
-    }
-  }
-
-  // special case if this data blob is the list of referenced classes
-  else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
-    if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
-      addObjCClassRef(gv);
-    }
-  }
-}
-
-/// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
-void LTOModule::addDefinedFunctionSymbol(const Function *f) {
-  // add to list of defined symbols
-  addDefinedSymbol(f, true);
-}
-
-/// addDefinedSymbol - Add a defined symbol to the list.
-void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
-  // ignore all llvm.* symbols
-  if (def->getName().startswith("llvm."))
-    return;
-
-  // string is owned by _defines
-  SmallString<64> Buffer;
-  _mangler.getNameWithPrefix(Buffer, def, false);
-
-  // set alignment part log2() can have rounding errors
-  uint32_t align = def->getAlignment();
-  uint32_t attr = align ? countTrailingZeros(def->getAlignment()) : 0;
-
-  // set permissions part
-  if (isFunction) {
-    attr |= LTO_SYMBOL_PERMISSIONS_CODE;
-  } else {
-    const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
-    if (gv && gv->isConstant())
-      attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
-    else
-      attr |= LTO_SYMBOL_PERMISSIONS_DATA;
-  }
-
-  // set definition part
-  if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
-      def->hasLinkerPrivateWeakLinkage())
-    attr |= LTO_SYMBOL_DEFINITION_WEAK;
-  else if (def->hasCommonLinkage())
-    attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
-  else
-    attr |= LTO_SYMBOL_DEFINITION_REGULAR;
-
-  // set scope part
-  if (def->hasHiddenVisibility())
-    attr |= LTO_SYMBOL_SCOPE_HIDDEN;
-  else if (def->hasProtectedVisibility())
-    attr |= LTO_SYMBOL_SCOPE_PROTECTED;
-  else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
-           def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
-           def->hasLinkerPrivateWeakLinkage())
-    attr |= LTO_SYMBOL_SCOPE_DEFAULT;
-  else if (def->hasLinkOnceODRAutoHideLinkage())
-    attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
-  else
-    attr |= LTO_SYMBOL_SCOPE_INTERNAL;
-
-  StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
-  entry.setValue(1);
-
-  // fill information structure
-  NameAndAttributes info;
-  StringRef Name = entry.getKey();
-  info.name = Name.data();
-  assert(info.name[Name.size()] == '\0');
-  info.attributes = attr;
-  info.isFunction = isFunction;
-  info.symbol = def;
-
-  // add to table of symbols
-  _symbols.push_back(info);
-}
-
-/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
-/// defined list.
-void LTOModule::addAsmGlobalSymbol(const char *name,
-                                   lto_symbol_attributes scope) {
-  StringSet::value_type &entry = _defines.GetOrCreateValue(name);
-
-  // only add new define if not already defined
-  if (entry.getValue())
-    return;
-
-  entry.setValue(1);
-
-  NameAndAttributes &info = _undefines[entry.getKey().data()];
-
-  if (info.symbol == 0) {
-    // FIXME: This is trying to take care of module ASM like this:
-    //
-    //   module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
-    //
-    // but is gross and its mother dresses it funny. Have the ASM parser give us
-    // more details for this type of situation so that we're not guessing so
-    // much.
-
-    // fill information structure
-    info.name = entry.getKey().data();
-    info.attributes =
-      LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
-    info.isFunction = false;
-    info.symbol = 0;
-
-    // add to table of symbols
-    _symbols.push_back(info);
-    return;
-  }
-
-  if (info.isFunction)
-    addDefinedFunctionSymbol(cast<Function>(info.symbol));
-  else
-    addDefinedDataSymbol(info.symbol);
-
-  _symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
-  _symbols.back().attributes |= scope;
-}
-
-/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
-/// undefined list.
-void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
-  StringMap<NameAndAttributes>::value_type &entry =
-    _undefines.GetOrCreateValue(name);
-
-  _asm_undefines.push_back(entry.getKey().data());
-
-  // we already have the symbol
-  if (entry.getValue().name)
-    return;
-
-  uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
-  attr |= LTO_SYMBOL_SCOPE_DEFAULT;
-  NameAndAttributes info;
-  info.name = entry.getKey().data();
-  info.attributes = attr;
-  info.isFunction = false;
-  info.symbol = 0;
-
-  entry.setValue(info);
-}
-
-/// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet to a
-/// list to be resolved later.
-void
-LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
-  // ignore all llvm.* symbols
-  if (decl->getName().startswith("llvm."))
-    return;
-
-  // ignore all aliases
-  if (isa<GlobalAlias>(decl))
-    return;
-
-  SmallString<64> name;
-  _mangler.getNameWithPrefix(name, decl, false);
-
-  StringMap<NameAndAttributes>::value_type &entry =
-    _undefines.GetOrCreateValue(name);
-
-  // we already have the symbol
-  if (entry.getValue().name)
-    return;
-
-  NameAndAttributes info;
-
-  info.name = entry.getKey().data();
-
-  if (decl->hasExternalWeakLinkage())
-    info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
-  else
-    info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
-
-  info.isFunction = isFunc;
-  info.symbol = decl;
-
-  entry.setValue(info);
-}
-
-namespace {
-  class RecordStreamer : public MCStreamer {
-  public:
-    enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
-
-  private:
-    StringMap<State> Symbols;
-
-    void markDefined(const MCSymbol &Symbol) {
-      State &S = Symbols[Symbol.getName()];
-      switch (S) {
-      case DefinedGlobal:
-      case Global:
-        S = DefinedGlobal;
-        break;
-      case NeverSeen:
-      case Defined:
-      case Used:
-        S = Defined;
-        break;
-      }
-    }
-    void markGlobal(const MCSymbol &Symbol) {
-      State &S = Symbols[Symbol.getName()];
-      switch (S) {
-      case DefinedGlobal:
-      case Defined:
-        S = DefinedGlobal;
-        break;
-
-      case NeverSeen:
-      case Global:
-      case Used:
-        S = Global;
-        break;
-      }
-    }
-    void markUsed(const MCSymbol &Symbol) {
-      State &S = Symbols[Symbol.getName()];
-      switch (S) {
-      case DefinedGlobal:
-      case Defined:
-      case Global:
-        break;
-
-      case NeverSeen:
-      case Used:
-        S = Used;
-        break;
-      }
-    }
-
-    // FIXME: mostly copied for the obj streamer.
-    void AddValueSymbols(const MCExpr *Value) {
-      switch (Value->getKind()) {
-      case MCExpr::Target:
-        // FIXME: What should we do in here?
-        break;
-
-      case MCExpr::Constant:
-        break;
-
-      case MCExpr::Binary: {
-        const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
-        AddValueSymbols(BE->getLHS());
-        AddValueSymbols(BE->getRHS());
-        break;
-      }
-
-      case MCExpr::SymbolRef:
-        markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
-        break;
-
-      case MCExpr::Unary:
-        AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
-        break;
-      }
-    }
-
-  public:
-    typedef StringMap<State>::const_iterator const_iterator;
-
-    const_iterator begin() {
-      return Symbols.begin();
-    }
-
-    const_iterator end() {
-      return Symbols.end();
-    }
-
-    RecordStreamer(MCContext &Context)
-        : MCStreamer(SK_RecordStreamer, Context) {}
-
-    virtual void EmitInstruction(const MCInst &Inst) {
-      // Scan for values.
-      for (unsigned i = Inst.getNumOperands(); i--; )
-        if (Inst.getOperand(i).isExpr())
-          AddValueSymbols(Inst.getOperand(i).getExpr());
-    }
-    virtual void EmitLabel(MCSymbol *Symbol) {
-      Symbol->setSection(*getCurrentSection().first);
-      markDefined(*Symbol);
-    }
-    virtual void EmitDebugLabel(MCSymbol *Symbol) {
-      EmitLabel(Symbol);
-    }
-    virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
-      // FIXME: should we handle aliases?
-      markDefined(*Symbol);
-    }
-    virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
-      if (Attribute == MCSA_Global)
-        markGlobal(*Symbol);
-      return true;
-    }
-    virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
-                              uint64_t Size , unsigned ByteAlignment) {
-      markDefined(*Symbol);
-    }
-    virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
-                                  unsigned ByteAlignment) {
-      markDefined(*Symbol);
-    }
-
-    virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
-    virtual void EmitBundleLock(bool AlignToEnd) {}
-    virtual void EmitBundleUnlock() {}
-
-    // Noop calls.
-    virtual void ChangeSection(const MCSection *Section,
-                               const MCExpr *Subsection) {}
-    virtual void InitToTextSection() {}
-    virtual void InitSections() {}
-    virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
-    virtual void EmitThumbFunc(MCSymbol *Func) {}
-    virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
-    virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
-    virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
-    virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
-    virtual void EmitCOFFSymbolType(int Type) {}
-    virtual void EndCOFFSymbolDef() {}
-    virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
-    virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
-                                       unsigned ByteAlignment) {}
-    virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
-                                uint64_t Size, unsigned ByteAlignment) {}
-    virtual void EmitBytes(StringRef Data) {}
-    virtual void EmitValueImpl(const MCExpr *Value, unsigned Size) {}
-    virtual void EmitULEB128Value(const MCExpr *Value) {}
-    virtual void EmitSLEB128Value(const MCExpr *Value) {}
-    virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
-                                      unsigned ValueSize,
-                                      unsigned MaxBytesToEmit) {}
-    virtual void EmitCodeAlignment(unsigned ByteAlignment,
-                                   unsigned MaxBytesToEmit) {}
-    virtual bool EmitValueToOffset(const MCExpr *Offset,
-                                   unsigned char Value ) { return false; }
-    virtual void EmitFileDirective(StringRef Filename) {}
-    virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
-                                          const MCSymbol *LastLabel,
-                                          const MCSymbol *Label,
-                                          unsigned PointerSize) {}
-    virtual void FinishImpl() {}
-    virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
-      RecordProcEnd(Frame);
-    }
-
-    static bool classof(const MCStreamer *S) {
-      return S->getKind() == SK_RecordStreamer;
-    }
-  };
-} // end anonymous namespace
-
-/// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
-/// defined or undefined lists.
-bool LTOModule::addAsmGlobalSymbols(std::string &errMsg) {
-  const std::string &inlineAsm = _module->getModuleInlineAsm();
-  if (inlineAsm.empty())
-    return false;
-
-  OwningPtr<RecordStreamer> Streamer(new RecordStreamer(_context));
-  MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
-  SourceMgr SrcMgr;
-  SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
-  OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr,
-                                                  _context, *Streamer,
-                                                  *_target->getMCAsmInfo()));
-  const Target &T = _target->getTarget();
-  OwningPtr<MCInstrInfo> MCII(T.createMCInstrInfo());
-  OwningPtr<MCSubtargetInfo>
-    STI(T.createMCSubtargetInfo(_target->getTargetTriple(),
-                                _target->getTargetCPU(),
-                                _target->getTargetFeatureString()));
-  OwningPtr<MCTargetAsmParser> TAP(T.createMCAsmParser(*STI, *Parser.get(), *MCII));
-  if (!TAP) {
-    errMsg = "target " + std::string(T.getName()) +
-      " does not define AsmParser.";
-    return true;
-  }
-
-  Parser->setTargetParser(*TAP);
-  if (Parser->Run(false))
-    return true;
-
-  for (RecordStreamer::const_iterator i = Streamer->begin(),
-         e = Streamer->end(); i != e; ++i) {
-    StringRef Key = i->first();
-    RecordStreamer::State Value = i->second;
-    if (Value == RecordStreamer::DefinedGlobal)
-      addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
-    else if (Value == RecordStreamer::Defined)
-      addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
-    else if (Value == RecordStreamer::Global ||
-             Value == RecordStreamer::Used)
-      addAsmGlobalSymbolUndef(Key.data());
-  }
-
-  return false;
-}
-
-/// isDeclaration - Return 'true' if the global value is a declaration.
-static bool isDeclaration(const GlobalValue &V) {
-  if (V.hasAvailableExternallyLinkage())
-    return true;
-
-  if (V.isMaterializable())
-    return false;
-
-  return V.isDeclaration();
-}
-
-/// parseSymbols - Parse the symbols from the module and model-level ASM and add
-/// them to either the defined or undefined lists.
-bool LTOModule::parseSymbols(std::string &errMsg) {
-  // add functions
-  for (Module::iterator f = _module->begin(), e = _module->end(); f != e; ++f) {
-    if (isDeclaration(*f))
-      addPotentialUndefinedSymbol(f, true);
-    else
-      addDefinedFunctionSymbol(f);
-  }
-
-  // add data
-  for (Module::global_iterator v = _module->global_begin(),
-         e = _module->global_end(); v !=  e; ++v) {
-    if (isDeclaration(*v))
-      addPotentialUndefinedSymbol(v, false);
-    else
-      addDefinedDataSymbol(v);
-  }
-
-  // add asm globals
-  if (addAsmGlobalSymbols(errMsg))
-    return true;
-
-  // add aliases
-  for (Module::alias_iterator a = _module->alias_begin(),
-         e = _module->alias_end(); a != e; ++a) {
-    if (isDeclaration(*a->getAliasedGlobal()))
-      // Is an alias to a declaration.
-      addPotentialUndefinedSymbol(a, false);
-    else
-      addDefinedDataSymbol(a);
-  }
-
-  // make symbols for all undefines
-  for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
-         e = _undefines.end(); u != e; ++u) {
-    // If this symbol also has a definition, then don't make an undefine because
-    // it is a tentative definition.
-    if (_defines.count(u->getKey())) continue;
-    NameAndAttributes info = u->getValue();
-    _symbols.push_back(info);
-  }
-
-  return false;
-}
diff --git a/tools/lto/LTOModule.h b/tools/lto/LTOModule.h
deleted file mode 100644
index 902e9c5..0000000
--- a/tools/lto/LTOModule.h
+++ /dev/null
@@ -1,190 +0,0 @@
-//===-LTOModule.h - LLVM Link Time Optimizer ------------------------------===//
-//
-//                     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 LTOModule class.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LTO_MODULE_H
-#define LTO_MODULE_H
-
-#include "llvm-c/lto.h"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/IR/Module.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Target/TargetMachine.h"
-#include <string>
-#include <vector>
-
-// Forward references to llvm classes.
-namespace llvm {
-  class Function;
-  class GlobalValue;
-  class MemoryBuffer;
-  class TargetOptions;
-  class Value;
-}
-
-//===----------------------------------------------------------------------===//
-/// LTOModule - C++ class which implements the opaque lto_module_t type.
-///
-struct LTOModule {
-private:
-  typedef llvm::StringMap<uint8_t> StringSet;
-
-  struct NameAndAttributes {
-    const char        *name;
-    uint32_t           attributes;
-    bool               isFunction;
-    const llvm::GlobalValue *symbol;
-  };
-
-  llvm::OwningPtr<llvm::Module>           _module;
-  llvm::OwningPtr<llvm::TargetMachine>    _target;
-  std::vector<NameAndAttributes>          _symbols;
-
-  // _defines and _undefines only needed to disambiguate tentative definitions
-  StringSet                               _defines;
-  llvm::StringMap<NameAndAttributes>      _undefines;
-  std::vector<const char*>                _asm_undefines;
-  llvm::MCContext                         _context;
-
-  // Use mangler to add GlobalPrefix to names to match linker names.
-  llvm::Mangler                           _mangler;
-
-  LTOModule(llvm::Module *m, llvm::TargetMachine *t);
-public:
-  /// isBitcodeFile - Returns 'true' if the file or memory contents is LLVM
-  /// bitcode.
-  static bool isBitcodeFile(const void *mem, size_t length);
-  static bool isBitcodeFile(const char *path);
-
-  /// isBitcodeFileForTarget - Returns 'true' if the file or memory contents
-  /// is LLVM bitcode for the specified triple.
-  static bool isBitcodeFileForTarget(const void *mem,
-                                     size_t length,
-                                     const char *triplePrefix);
-  static bool isBitcodeFileForTarget(const char *path,
-                                     const char *triplePrefix);
-
-  /// makeLTOModule - Create an LTOModule. N.B. These methods take ownership
-  /// of the buffer.
-  static LTOModule *makeLTOModule(const char* path,
-                                  std::string &errMsg);
-  static LTOModule *makeLTOModule(int fd, const char *path,
-                                  size_t size, std::string &errMsg);
-  static LTOModule *makeLTOModule(int fd, const char *path,
-                                  size_t map_size,
-                                  off_t offset,
-                                  std::string& errMsg);
-  static LTOModule *makeLTOModule(const void *mem, size_t length,
-                                  std::string &errMsg);
-
-  /// getTargetTriple - Return the Module's target triple.
-  const char *getTargetTriple() {
-    return _module->getTargetTriple().c_str();
-  }
-
-  /// setTargetTriple - Set the Module's target triple.
-  void setTargetTriple(const char *triple) {
-    _module->setTargetTriple(triple);
-  }
-
-  /// getSymbolCount - Get the number of symbols
-  uint32_t getSymbolCount() {
-    return _symbols.size();
-  }
-
-  /// getSymbolAttributes - Get the attributes for a symbol at the specified
-  /// index.
-  lto_symbol_attributes getSymbolAttributes(uint32_t index) {
-    if (index < _symbols.size())
-      return lto_symbol_attributes(_symbols[index].attributes);
-    return lto_symbol_attributes(0);
-  }
-
-  /// getSymbolName - Get the name of the symbol at the specified index.
-  const char *getSymbolName(uint32_t index) {
-    if (index < _symbols.size())
-      return _symbols[index].name;
-    return NULL;
-  }
-
-  /// getLLVVMModule - Return the Module.
-  llvm::Module *getLLVVMModule() { return _module.get(); }
-
-  /// getAsmUndefinedRefs -
-  const std::vector<const char*> &getAsmUndefinedRefs() {
-    return _asm_undefines;
-  }
-
-  /// getTargetOptions - Fill the TargetOptions object with the options
-  /// specified on the command line.
-  static void getTargetOptions(llvm::TargetOptions &Options);
-
-private:
-  /// parseSymbols - Parse the symbols from the module and model-level ASM and
-  /// add them to either the defined or undefined lists.
-  bool parseSymbols(std::string &errMsg);
-
-  /// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet
-  /// to a list to be resolved later.
-  void addPotentialUndefinedSymbol(const llvm::GlobalValue *dcl, bool isFunc);
-
-  /// addDefinedSymbol - Add a defined symbol to the list.
-  void addDefinedSymbol(const llvm::GlobalValue *def, bool isFunction);
-
-  /// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
-  void addDefinedFunctionSymbol(const llvm::Function *f);
-
-  /// addDefinedDataSymbol - Add a data symbol as defined to the list.
-  void addDefinedDataSymbol(const llvm::GlobalValue *v);
-
-  /// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
-  /// defined or undefined lists.
-  bool addAsmGlobalSymbols(std::string &errMsg);
-
-  /// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
-  /// defined list.
-  void addAsmGlobalSymbol(const char *, lto_symbol_attributes scope);
-
-  /// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to
-  /// the undefined list.
-  void addAsmGlobalSymbolUndef(const char *);
-
-  /// addObjCClass - Parse i386/ppc ObjC class data structure.
-  void addObjCClass(const llvm::GlobalVariable *clgv);
-
-  /// addObjCCategory - Parse i386/ppc ObjC category data structure.
-  void addObjCCategory(const llvm::GlobalVariable *clgv);
-
-  /// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
-  void addObjCClassRef(const llvm::GlobalVariable *clgv);
-
-  /// objcClassNameFromExpression - Get string that the data pointer points
-  /// to.
-  bool objcClassNameFromExpression(const llvm::Constant* c, std::string &name);
-
-  /// isTargetMatch - Returns 'true' if the memory buffer is for the specified
-  /// target triple.
-  static bool isTargetMatch(llvm::MemoryBuffer *memBuffer,
-                            const char *triplePrefix);
-
-  /// makeLTOModule - Create an LTOModule (private version). N.B. This
-  /// method takes ownership of the buffer.
-  static LTOModule *makeLTOModule(llvm::MemoryBuffer *buffer,
-                                  std::string &errMsg);
-
-  /// makeBuffer - Create a MemoryBuffer from a memory range.
-  static llvm::MemoryBuffer *makeBuffer(const void *mem, size_t length);
-};
-
-#endif // LTO_MODULE_H
diff --git a/tools/lto/Makefile b/tools/lto/Makefile
index 56c67df..672fef4 100644
--- a/tools/lto/Makefile
+++ b/tools/lto/Makefile
@@ -10,7 +10,7 @@
 LEVEL := ../..
 LIBRARYNAME := LTO
 LINK_COMPONENTS := all-targets ipo scalaropts linker bitreader bitwriter \
-                   mcdisassembler vectorize
+                   lto mcdisassembler vectorize
 LINK_LIBS_IN_SHARED := 1
 SHARED_LIBRARY := 1
 
diff --git a/tools/lto/lto.cpp b/tools/lto/lto.cpp
index db7147c..441bc77 100644
--- a/tools/lto/lto.cpp
+++ b/tools/lto/lto.cpp
@@ -13,15 +13,33 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm-c/lto.h"
-#include "LTOCodeGenerator.h"
-#include "LTOModule.h"
+#include "llvm/LTO/LTOCodeGenerator.h"
+#include "llvm/LTO/LTOModule.h"
 #include "llvm-c/Core.h"
+#include "llvm-c/Target.h"
 
 
 // Holds most recent error string.
 // *** Not thread safe ***
 static std::string sLastErrorString;
 
+// Holds the initialization state of the LTO module.
+// *** Not thread safe ***
+static bool initialized = false;
+
+// Initialize the configured targets if they have not been initialized.
+static void lto_initialize() {
+  if (!initialized) {
+    LLVMInitializeAllTargetInfos();
+    LLVMInitializeAllTargets();
+    LLVMInitializeAllTargetMCs();
+    LLVMInitializeAllAsmParsers();
+    LLVMInitializeAllAsmPrinters();
+    LLVMInitializeAllDisassemblers();
+    initialized = true;
+  }
+}
+
 /// lto_get_version - Returns a printable string.
 extern const char* lto_get_version() {
   return LTOCodeGenerator::getVersionString();
@@ -63,12 +81,14 @@ lto_module_is_object_file_in_memory_for_target(const void* mem,
 /// lto_module_create - Loads an object file from disk. Returns NULL on error
 /// (check lto_get_error_message() for details).
 lto_module_t lto_module_create(const char* path) {
+  lto_initialize();
   return LTOModule::makeLTOModule(path, sLastErrorString);
 }
 
 /// lto_module_create_from_fd - Loads an object file from disk. Returns NULL on
 /// error (check lto_get_error_message() for details).
 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
+  lto_initialize();
   return LTOModule::makeLTOModule(fd, path, size, sLastErrorString);
 }
 
@@ -78,12 +98,14 @@ lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
                                                  size_t file_size,
                                                  size_t map_size,
                                                  off_t offset) {
+  lto_initialize();
   return LTOModule::makeLTOModule(fd, path, map_size, offset, sLastErrorString);
 }
 
 /// lto_module_create_from_memory - Loads an object file from memory. Returns
 /// NULL on error (check lto_get_error_message() for details).
 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
+  lto_initialize();
   return LTOModule::makeLTOModule(mem, length, sLastErrorString);
 }
 
@@ -127,6 +149,7 @@ lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
 /// lto_codegen_create - Instantiates a code generator. Returns NULL if there
 /// is an error.
 lto_code_gen_t lto_codegen_create(void) {
+  lto_initialize();
   return new LTOCodeGenerator();
 }