X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Fllc%2Fllc.cpp;h=e33cd795d3ae2d01b2fe708ad6e8c70d6779d16a;hb=00552e3875ee5f382db6c98286a241a7d0efe1b8;hp=bd915ae7d6f769dda882b3863dfdfe5e4bcced0d;hpb=0d9eb9b4917340acbfc831890655b8e9724959f6;p=oota-llvm.git

diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp
index bd915ae7d6f..e33cd795d3a 100644
--- a/tools/llc/llc.cpp
+++ b/tools/llc/llc.cpp
@@ -13,31 +13,38 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/CodeGen/FileWriters.h"
-#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/CodeGen/CommandFlags.h"
 #include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
-#include "llvm/Target/SubtargetFeature.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachineRegistry.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Module.h"
-#include "llvm/ModuleProvider.h"
-#include "llvm/PassManager.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/CodeGen/MIRParser/MIRParser.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/IRPrintingPasses.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/MC/SubtargetFeature.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/PluginLoader.h"
-#include "llvm/Support/FileUtilities.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/System/Signals.h"
-#include "llvm/Config/config.h"
-#include "llvm/LinkAllVMCore.h"
-#include <fstream>
-#include <iostream>
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
 #include <memory>
 using namespace llvm;
 
@@ -51,275 +58,332 @@ InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
 static cl::opt<std::string>
 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
 
-static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
+static cl::opt<unsigned>
+TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
+                 cl::value_desc("N"),
+                 cl::desc("Repeat compilation N times for timing"));
 
-static cl::opt<bool> Fast("fast", 
-      cl::desc("Generate code quickly, potentially sacrificing code quality"));
+static cl::opt<bool>
+NoIntegratedAssembler("no-integrated-as", cl::Hidden,
+                      cl::desc("Disable integrated assembler"));
+
+// Determine optimization level.
+static cl::opt<char>
+OptLevel("O",
+         cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
+                  "(default = '-O2')"),
+         cl::Prefix,
+         cl::ZeroOrMore,
+         cl::init(' '));
 
 static cl::opt<std::string>
 TargetTriple("mtriple", cl::desc("Override target triple for module"));
 
-static cl::opt<const TargetMachineRegistry::entry*, false,
-               TargetMachineRegistry::Parser>
-MArch("march", cl::desc("Architecture to generate code for:"));
+static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
+                              cl::desc("Do not verify input module"));
 
-static cl::opt<std::string>
-MCPU("mcpu", 
-  cl::desc("Target a specific cpu type (-mcpu=help for details)"),
-  cl::value_desc("cpu-name"),
-  cl::init(""));
-
-static cl::list<std::string>
-MAttrs("mattr", 
-  cl::CommaSeparated,
-  cl::desc("Target specific attributes (-mattr=help for details)"),
-  cl::value_desc("a1,+a2,-a3,..."));
-
-cl::opt<TargetMachine::CodeGenFileType>
-FileType("filetype", cl::init(TargetMachine::AssemblyFile),
-  cl::desc("Choose a file type (not all types are supported by all targets):"),
-  cl::values(
-       clEnumValN(TargetMachine::AssemblyFile,    "asm",
-                  "Emit an assembly ('.s') file"),
-       clEnumValN(TargetMachine::ObjectFile,    "obj",
-                  "Emit a native object ('.o') file [experimental]"),
-       clEnumValN(TargetMachine::DynamicLibrary, "dynlib",
-                  "Emit a native dynamic library ('.so') file"
-                  " [experimental]"),
-       clEnumValEnd));
-
-cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
-                       cl::desc("Do not verify input module"));
-
-
-// GetFileNameRoot - Helper function to get the basename of a filename.
-static inline std::string
-GetFileNameRoot(const std::string &InputFilename) {
-  std::string IFN = InputFilename;
-  std::string outputFilename;
-  int Len = IFN.length();
-  if ((Len > 2) &&
-      IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
-    outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
-  } else {
-    outputFilename = IFN;
-  }
-  return outputFilename;
-}
+static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls",
+                                             cl::desc("Disable simplify-libcalls"));
 
-static raw_ostream *GetOutputStream(const char *ProgName) {
-  if (OutputFilename != "") {
-    if (OutputFilename == "-")
-      return &outs();
-
-    // Specified an output filename?
-    if (!Force && std::ifstream(OutputFilename.c_str())) {
-      // If force is not specified, make sure not to overwrite a file!
-      std::cerr << ProgName << ": error opening '" << OutputFilename
-                << "': file exists!\n"
-                << "Use -f command line argument to force output\n";
-      return 0;
-    }
-    // Make sure that the Out file gets unlinked from the disk if we get a
-    // SIGINT
-    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-
-    std::string error;
-    raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), true, error);
-    if (!error.empty()) {
-      std::cerr << error << '\n';
-      delete Out;
-      return 0;
-    }
+static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
+                                    cl::desc("Show encoding in .s output"));
 
-    return Out;
-  }
-  
-  if (InputFilename == "-") {
-    OutputFilename = "-";
-    return &outs();
+static cl::opt<bool> EnableDwarfDirectory(
+    "enable-dwarf-directory", cl::Hidden,
+    cl::desc("Use .file directives with an explicit directory."));
+
+static cl::opt<bool> AsmVerbose("asm-verbose",
+                                cl::desc("Add comments to directives."),
+                                cl::init(true));
+
+static int compileModule(char **, LLVMContext &);
+
+static std::unique_ptr<tool_output_file>
+GetOutputStream(const char *TargetName, Triple::OSType OS,
+                const char *ProgName) {
+  // If we don't yet have an output filename, make one.
+  if (OutputFilename.empty()) {
+    if (InputFilename == "-")
+      OutputFilename = "-";
+    else {
+      // If InputFilename ends in .bc or .ll, remove it.
+      StringRef IFN = InputFilename;
+      if (IFN.endswith(".bc") || IFN.endswith(".ll"))
+        OutputFilename = IFN.drop_back(3);
+      else if (IFN.endswith(".mir"))
+        OutputFilename = IFN.drop_back(4);
+      else
+        OutputFilename = IFN;
+
+      switch (FileType) {
+      case TargetMachine::CGFT_AssemblyFile:
+        if (TargetName[0] == 'c') {
+          if (TargetName[1] == 0)
+            OutputFilename += ".cbe.c";
+          else if (TargetName[1] == 'p' && TargetName[2] == 'p')
+            OutputFilename += ".cpp";
+          else
+            OutputFilename += ".s";
+        } else
+          OutputFilename += ".s";
+        break;
+      case TargetMachine::CGFT_ObjectFile:
+        if (OS == Triple::Win32)
+          OutputFilename += ".obj";
+        else
+          OutputFilename += ".o";
+        break;
+      case TargetMachine::CGFT_Null:
+        OutputFilename += ".null";
+        break;
+      }
+    }
   }
 
-  OutputFilename = GetFileNameRoot(InputFilename);
-    
+  // Decide if we need "binary" output.
   bool Binary = false;
   switch (FileType) {
-  case TargetMachine::AssemblyFile:
-    if (MArch->Name[0] == 'c') {
-      if (MArch->Name[1] == 0)
-        OutputFilename += ".cbe.c";
-      else if (MArch->Name[1] == 'p' && MArch->Name[2] == 'p')
-        OutputFilename += ".cpp";
-      else
-        OutputFilename += ".s";
-    } else
-      OutputFilename += ".s";
-    break;
-  case TargetMachine::ObjectFile:
-    OutputFilename += ".o";
-    Binary = true;
+  case TargetMachine::CGFT_AssemblyFile:
     break;
-  case TargetMachine::DynamicLibrary:
-    OutputFilename += LTDL_SHLIB_EXT;
+  case TargetMachine::CGFT_ObjectFile:
+  case TargetMachine::CGFT_Null:
     Binary = true;
     break;
   }
-  
-  if (!Force && std::ifstream(OutputFilename.c_str())) {
-    // If force is not specified, make sure not to overwrite a file!
-    std::cerr << ProgName << ": error opening '" << OutputFilename
-                          << "': file exists!\n"
-                          << "Use -f command line argument to force output\n";
-    return 0;
-  }
-  
-  // Make sure that the Out file gets unlinked from the disk if we get a
-  // SIGINT
-  sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-  
-  std::string error;
-  raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), Binary, error);
-  if (!error.empty()) {
-    std::cerr << error << '\n';
-    delete Out;
-    return 0;
+
+  // Open the file.
+  std::error_code EC;
+  sys::fs::OpenFlags OpenFlags = sys::fs::F_None;
+  if (!Binary)
+    OpenFlags |= sys::fs::F_Text;
+  auto FDOut = llvm::make_unique<tool_output_file>(OutputFilename, EC,
+                                                   OpenFlags);
+  if (EC) {
+    errs() << EC.message() << '\n';
+    return nullptr;
   }
-  
-  return Out;
+
+  return FDOut;
 }
 
 // main - Entry point for the llc compiler.
 //
 int main(int argc, char **argv) {
-  llvm_shutdown_obj X;  // Call llvm_shutdown() on exit.
-  cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
   sys::PrintStackTraceOnErrorSignal();
+  PrettyStackTraceProgram X(argc, argv);
+
+  // Enable debug stream buffering.
+  EnableDebugBuffering = true;
 
+  LLVMContext &Context = getGlobalContext();
+  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
+
+  // Initialize targets first, so that --version shows registered targets.
+  InitializeAllTargets();
+  InitializeAllTargetMCs();
+  InitializeAllAsmPrinters();
+  InitializeAllAsmParsers();
+
+  // Initialize codegen and IR passes used by llc so that the -print-after,
+  // -print-before, and -stop-after options work.
+  PassRegistry *Registry = PassRegistry::getPassRegistry();
+  initializeCore(*Registry);
+  initializeCodeGen(*Registry);
+  initializeLoopStrengthReducePass(*Registry);
+  initializeLowerIntrinsicsPass(*Registry);
+  initializeUnreachableBlockElimPass(*Registry);
+
+  // Register the target printer for --version.
+  cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
+
+  cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+
+  // Compile the module TimeCompilations times to give better compile time
+  // metrics.
+  for (unsigned I = TimeCompilations; I; --I)
+    if (int RetVal = compileModule(argv, Context))
+      return RetVal;
+  return 0;
+}
+
+static int compileModule(char **argv, LLVMContext &Context) {
   // Load the module to be compiled...
-  std::string ErrorMessage;
-  std::auto_ptr<Module> M;
-  
-  std::auto_ptr<MemoryBuffer> Buffer(
-                   MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage));
-  if (Buffer.get())
-    M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage));
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": bitcode didn't read correctly.\n";
-    std::cerr << "Reason: " << ErrorMessage << "\n";
-    return 1;
-  }
-  Module &mod = *M.get();
-  
-  // If we are supposed to override the target triple, do so now.
-  if (!TargetTriple.empty())
-    mod.setTargetTriple(TargetTriple);
-  
-  // Allocate target machine.  First, check whether the user has
-  // explicitly specified an architecture to compile for.
-  if (MArch == 0) {
-    std::string Err;
-    MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
-    if (MArch == 0) {
-      std::cerr << argv[0] << ": error auto-selecting target for module '"
-                << Err << "'.  Please use the -march option to explicitly "
-                << "pick a target.\n";
+  SMDiagnostic Err;
+  std::unique_ptr<Module> M;
+  std::unique_ptr<MIRParser> MIR;
+  Triple TheTriple;
+
+  bool SkipModule = MCPU == "help" ||
+                    (!MAttrs.empty() && MAttrs.front() == "help");
+
+  // If user just wants to list available options, skip module loading
+  if (!SkipModule) {
+    if (StringRef(InputFilename).endswith_lower(".mir")) {
+      MIR = createMIRParserFromFile(InputFilename, Err, Context);
+      if (MIR) {
+        M = MIR->parseLLVMModule();
+        assert(M && "parseLLVMModule should exit on failure");
+      }
+    } else
+      M = parseIRFile(InputFilename, Err, Context);
+    if (!M) {
+      Err.print(argv[0], errs());
       return 1;
     }
-  }
 
-  // Package up features to be passed to target/subtarget
-  std::string FeaturesStr;
-  if (MCPU.size() || MAttrs.size()) {
-    SubtargetFeatures Features;
-    Features.setCPU(MCPU);
-    for (unsigned i = 0; i != MAttrs.size(); ++i)
-      Features.AddFeature(MAttrs[i]);
-    FeaturesStr = Features.getString();
-  }
-  
-  std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
-  assert(target.get() && "Could not allocate target machine!");
-  TargetMachine &Target = *target.get();
-
-  // Figure out where we are going to send the output...
-  raw_ostream *Out = GetOutputStream(argv[0]);
-  if (Out == 0) return 1;
-  
-  // If this target requires addPassesToEmitWholeFile, do it now.  This is
-  // used by strange things like the C backend.
-  if (Target.WantsWholeFile()) {
-    PassManager PM;
-    PM.add(new TargetData(*Target.getTargetData()));
-    if (!NoVerify)
-      PM.add(createVerifierPass());
-    
-    // Ask the target to add backend passes as necessary.
-    if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, Fast)) {
-      std::cerr << argv[0] << ": target does not support generation of this"
-                << " file type!\n";
-      if (Out != &outs()) delete Out;
-      // And the Out file is empty and useless, so remove it now.
-      sys::Path(OutputFilename).eraseFromDisk();
+    // Verify module immediately to catch problems before doInitialization() is
+    // called on any passes.
+    if (!NoVerify && verifyModule(*M, &errs())) {
+      errs() << argv[0] << ": " << InputFilename
+             << ": error: input module is broken!\n";
       return 1;
     }
-    PM.run(mod);
+
+    // If we are supposed to override the target triple, do so now.
+    if (!TargetTriple.empty())
+      M->setTargetTriple(Triple::normalize(TargetTriple));
+    TheTriple = Triple(M->getTargetTriple());
   } else {
-    // Build up all of the passes that we want to do to the module.
-    ExistingModuleProvider Provider(M.release());
-    FunctionPassManager Passes(&Provider);
-    Passes.add(new TargetData(*Target.getTargetData()));
-    
-#ifndef NDEBUG
-    if (!NoVerify)
-      Passes.add(createVerifierPass());
-#endif
-  
-    // Ask the target to add backend passes as necessary.
-    MachineCodeEmitter *MCE = 0;
+    TheTriple = Triple(Triple::normalize(TargetTriple));
+  }
 
-    switch (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) {
-    default:
-      assert(0 && "Invalid file model!");
-      return 1;
-    case FileModel::Error:
-      std::cerr << argv[0] << ": target does not support generation of this"
-                << " file type!\n";
-      if (Out != &outs()) delete Out;
-      // And the Out file is empty and useless, so remove it now.
-      sys::Path(OutputFilename).eraseFromDisk();
-      return 1;
-    case FileModel::AsmFile:
-      break;
-    case FileModel::MachOFile:
-      MCE = AddMachOWriter(Passes, *Out, Target);
-      break;
-    case FileModel::ElfFile:
-      MCE = AddELFWriter(Passes, *Out, Target);
-      break;
+  if (TheTriple.getTriple().empty())
+    TheTriple.setTriple(sys::getDefaultTargetTriple());
+
+  // Get the target specific parser.
+  std::string Error;
+  const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
+                                                         Error);
+  if (!TheTarget) {
+    errs() << argv[0] << ": " << Error;
+    return 1;
+  }
+
+  std::string CPUStr = getCPUStr(), FeaturesStr = getFeaturesStr();
+
+  CodeGenOpt::Level OLvl = CodeGenOpt::Default;
+  switch (OptLevel) {
+  default:
+    errs() << argv[0] << ": invalid optimization level.\n";
+    return 1;
+  case ' ': break;
+  case '0': OLvl = CodeGenOpt::None; break;
+  case '1': OLvl = CodeGenOpt::Less; break;
+  case '2': OLvl = CodeGenOpt::Default; break;
+  case '3': OLvl = CodeGenOpt::Aggressive; break;
+  }
+
+  TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
+  Options.DisableIntegratedAS = NoIntegratedAssembler;
+  Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
+  Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory;
+  Options.MCOptions.AsmVerbose = AsmVerbose;
+
+  std::unique_ptr<TargetMachine> Target(
+      TheTarget->createTargetMachine(TheTriple.getTriple(), CPUStr, FeaturesStr,
+                                     Options, RelocModel, CMModel, OLvl));
+
+  assert(Target && "Could not allocate target machine!");
+
+  // If we don't have a module then just exit now. We do this down
+  // here since the CPU/Feature help is underneath the target machine
+  // creation.
+  if (SkipModule)
+    return 0;
+
+  assert(M && "Should have exited if we didn't have a module!");
+  if (FloatABIForCalls != FloatABI::Default)
+    Options.FloatABIType = FloatABIForCalls;
+
+  // Figure out where we are going to send the output.
+  std::unique_ptr<tool_output_file> Out =
+      GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]);
+  if (!Out) return 1;
+
+  // Build up all of the passes that we want to do to the module.
+  legacy::PassManager PM;
+
+  // Add an appropriate TargetLibraryInfo pass for the module's triple.
+  TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
+
+  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
+  if (DisableSimplifyLibCalls)
+    TLII.disableAllFunctions();
+  PM.add(new TargetLibraryInfoWrapperPass(TLII));
+
+  // Add the target data from the target machine, if it exists, or the module.
+  if (const DataLayout *DL = Target->getDataLayout())
+    M->setDataLayout(*DL);
+
+  // Override function attributes based on CPUStr, FeaturesStr, and command line
+  // flags.
+  setFunctionAttributes(CPUStr, FeaturesStr, *M);
+
+  if (RelaxAll.getNumOccurrences() > 0 &&
+      FileType != TargetMachine::CGFT_ObjectFile)
+    errs() << argv[0]
+             << ": warning: ignoring -mc-relax-all because filetype != obj";
+
+  {
+    raw_pwrite_stream *OS = &Out->os();
+    std::unique_ptr<buffer_ostream> BOS;
+    if (FileType != TargetMachine::CGFT_AssemblyFile &&
+        !Out->os().supportsSeeking()) {
+      BOS = make_unique<buffer_ostream>(*OS);
+      OS = BOS.get();
+    }
+
+    AnalysisID StartBeforeID = nullptr;
+    AnalysisID StartAfterID = nullptr;
+    AnalysisID StopAfterID = nullptr;
+    const PassRegistry *PR = PassRegistry::getPassRegistry();
+    if (!RunPass.empty()) {
+      if (!StartAfter.empty() || !StopAfter.empty()) {
+        errs() << argv[0] << ": start-after and/or stop-after passes are "
+                             "redundant when run-pass is specified.\n";
+        return 1;
+      }
+      const PassInfo *PI = PR->getPassInfo(RunPass);
+      if (!PI) {
+        errs() << argv[0] << ": run-pass pass is not registered.\n";
+        return 1;
+      }
+      StopAfterID = StartBeforeID = PI->getTypeInfo();
+    } else {
+      if (!StartAfter.empty()) {
+        const PassInfo *PI = PR->getPassInfo(StartAfter);
+        if (!PI) {
+          errs() << argv[0] << ": start-after pass is not registered.\n";
+          return 1;
+        }
+        StartAfterID = PI->getTypeInfo();
+      }
+      if (!StopAfter.empty()) {
+        const PassInfo *PI = PR->getPassInfo(StopAfter);
+        if (!PI) {
+          errs() << argv[0] << ": stop-after pass is not registered.\n";
+          return 1;
+        }
+        StopAfterID = PI->getTypeInfo();
+      }
     }
 
-    if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) {
-      std::cerr << argv[0] << ": target does not support generation of this"
-                << " file type!\n";
-      if (Out != &outs()) delete Out;
-      // And the Out file is empty and useless, so remove it now.
-      sys::Path(OutputFilename).eraseFromDisk();
+    // Ask the target to add backend passes as necessary.
+    if (Target->addPassesToEmitFile(PM, *OS, FileType, NoVerify, StartBeforeID,
+                                    StartAfterID, StopAfterID, MIR.get())) {
+      errs() << argv[0] << ": target does not support generation of this"
+             << " file type!\n";
       return 1;
     }
-  
-    Passes.doInitialization();
-  
-    // Run our queue of passes all at once now, efficiently.
-    // TODO: this could lazily stream functions out of the module.
-    for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I)
-      if (!I->isDeclaration())
-        Passes.run(*I);
-    
-    Passes.doFinalization();
+
+    // Before executing passes, print the final values of the LLVM options.
+    cl::PrintOptionValues();
+
+    PM.run(*M);
   }
-    
-  // Delete the ostream if it's not a stdout stream
-  if (Out != &outs()) delete Out;
+
+  // Declare success.
+  Out->keep();
 
   return 0;
 }