tools/opt/opt.cpp

   1 //===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Optimizations may be specified an arbitrary number of times on the command
  11 // line, They are run in the order specified.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/LLVMContext.h"
  16 #include "llvm/Module.h"
  17 #include "llvm/PassManager.h"
  18 #include "llvm/CallGraphSCCPass.h"
  19 #include "llvm/Bitcode/ReaderWriter.h"
  20 #include "llvm/Assembly/PrintModulePass.h"
  21 #include "llvm/Analysis/DebugInfo.h"
  22 #include "llvm/Analysis/Verifier.h"
  23 #include "llvm/Analysis/LoopPass.h"
  24 #include "llvm/Analysis/RegionPass.h"
  25 #include "llvm/Analysis/CallGraph.h"
  26 #include "llvm/Target/TargetData.h"
  27 #include "llvm/Target/TargetMachine.h"
  28 #include "llvm/Support/PassNameParser.h"
  29 #include "llvm/Support/Signals.h"
  30 #include "llvm/Support/Debug.h"
  31 #include "llvm/Support/IRReader.h"
  32 #include "llvm/Support/ManagedStatic.h"
  33 #include "llvm/Support/PluginLoader.h"
  34 #include "llvm/Support/PrettyStackTrace.h"
  35 #include "llvm/Support/StandardPasses.h"
  36 #include "llvm/Support/SystemUtils.h"
  37 #include "llvm/Support/ToolOutputFile.h"
  38 #include "llvm/LinkAllPasses.h"
  39 #include "llvm/LinkAllVMCore.h"
  40 #include <memory>
  41 #include <algorithm>
  42 using namespace llvm;
  43
  44 // The OptimizationList is automatically populated with registered Passes by the
  45 // PassNameParser.
  46 //
  47 static cl::list<const PassInfo*, bool, PassNameParser>
  48 PassList(cl::desc("Optimizations available:"));
  49
  50 // Other command line options...
  51 //
  52 static cl::opt<std::string>
  53 InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
  54     cl::init("-"), cl::value_desc("filename"));
  55
  56 static cl::opt<std::string>
  57 OutputFilename("o", cl::desc("Override output filename"),
  58                cl::value_desc("filename"));
  59
  60 static cl::opt<bool>
  61 Force("f", cl::desc("Enable binary output on terminals"));
  62
  63 static cl::opt<bool>
  64 PrintEachXForm("p", cl::desc("Print module after each transformation"));
  65
  66 static cl::opt<bool>
  67 NoOutput("disable-output",
  68          cl::desc("Do not write result bitcode file"), cl::Hidden);
  69
  70 static cl::opt<bool>
  71 OutputAssembly("S", cl::desc("Write output as LLVM assembly"));
  72
  73 static cl::opt<bool>
  74 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
  75
  76 static cl::opt<bool>
  77 VerifyEach("verify-each", cl::desc("Verify after each transform"));
  78
  79 static cl::opt<bool>
  80 StripDebug("strip-debug",
  81            cl::desc("Strip debugger symbol info from translation unit"));
  82
  83 static cl::opt<bool>
  84 DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
  85
  86 static cl::opt<bool>
  87 DisableOptimizations("disable-opt",
  88                      cl::desc("Do not run any optimization passes"));
  89
  90 static cl::opt<bool>
  91 DisableInternalize("disable-internalize",
  92                    cl::desc("Do not mark all symbols as internal"));
  93
  94 static cl::opt<bool>
  95 StandardCompileOpts("std-compile-opts",
  96                    cl::desc("Include the standard compile time optimizations"));
  97
  98 static cl::opt<bool>
  99 StandardLinkOpts("std-link-opts",
 100                  cl::desc("Include the standard link time optimizations"));
 101
 102 static cl::opt<bool>
 103 OptLevelO1("O1",
 104            cl::desc("Optimization level 1. Similar to llvm-gcc -O1"));
 105
 106 static cl::opt<bool>
 107 OptLevelO2("O2",
 108            cl::desc("Optimization level 2. Similar to llvm-gcc -O2"));
 109
 110 static cl::opt<bool>
 111 OptLevelO3("O3",
 112            cl::desc("Optimization level 3. Similar to llvm-gcc -O3"));
 113
 114 static cl::opt<bool>
 115 UnitAtATime("funit-at-a-time",
 116             cl::desc("Enable IPO. This is same as llvm-gcc's -funit-at-a-time"),
 117             cl::init(true));
 118
 119 static cl::opt<bool>
 120 DisableSimplifyLibCalls("disable-simplify-libcalls",
 121                         cl::desc("Disable simplify-libcalls"));
 122
 123 static cl::opt<bool>
 124 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
 125
 126 static cl::alias
 127 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
 128
 129 static cl::opt<bool>
 130 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
 131
 132 static cl::opt<bool>
 133 PrintBreakpoints("print-breakpoints-for-testing",
 134                  cl::desc("Print select breakpoints location for testing"));
 135
 136 static cl::opt<std::string>
 137 DefaultDataLayout("default-data-layout",
 138           cl::desc("data layout string to use if not specified by module"),
 139           cl::value_desc("layout-string"), cl::init(""));
 140
 141 // ---------- Define Printers for module and function passes ------------
 142 namespace {
 143
 144 struct CallGraphSCCPassPrinter : public CallGraphSCCPass {
 145   static char ID;
 146   const PassInfo *PassToPrint;
 147   raw_ostream &Out;
 148   std::string PassName;
 149
 150   CallGraphSCCPassPrinter(const PassInfo *PI, raw_ostream &out) :
 151     CallGraphSCCPass(ID), PassToPrint(PI), Out(out) {
 152       std::string PassToPrintName =  PassToPrint->getPassName();
 153       PassName = "CallGraphSCCPass Printer: " + PassToPrintName;
 154     }
 155
 156   virtual bool runOnSCC(CallGraphSCC &SCC) {
 157     if (!Quiet)
 158       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 159
 160     // Get and print pass...
 161     for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
 162       Function *F = (*I)->getFunction();
 163       if (F)
 164         getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 165                                                               F->getParent());
 166     }
 167     return false;
 168   }
 169
 170   virtual const char *getPassName() const { return PassName.c_str(); }
 171
 172   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 173     AU.addRequiredID(PassToPrint->getTypeInfo());
 174     AU.setPreservesAll();
 175   }
 176 };
 177
 178 char CallGraphSCCPassPrinter::ID = 0;
 179
 180 struct ModulePassPrinter : public ModulePass {
 181   static char ID;
 182   const PassInfo *PassToPrint;
 183   raw_ostream &Out;
 184   std::string PassName;
 185
 186   ModulePassPrinter(const PassInfo *PI, raw_ostream &out)
 187     : ModulePass(ID), PassToPrint(PI), Out(out) {
 188       std::string PassToPrintName =  PassToPrint->getPassName();
 189       PassName = "ModulePass Printer: " + PassToPrintName;
 190     }
 191
 192   virtual bool runOnModule(Module &M) {
 193     if (!Quiet)
 194       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 195
 196     // Get and print pass...
 197     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out, &M);
 198     return false;
 199   }
 200
 201   virtual const char *getPassName() const { return PassName.c_str(); }
 202
 203   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 204     AU.addRequiredID(PassToPrint->getTypeInfo());
 205     AU.setPreservesAll();
 206   }
 207 };
 208
 209 char ModulePassPrinter::ID = 0;
 210 struct FunctionPassPrinter : public FunctionPass {
 211   const PassInfo *PassToPrint;
 212   raw_ostream &Out;
 213   static char ID;
 214   std::string PassName;
 215
 216   FunctionPassPrinter(const PassInfo *PI, raw_ostream &out)
 217     : FunctionPass(ID), PassToPrint(PI), Out(out) {
 218       std::string PassToPrintName =  PassToPrint->getPassName();
 219       PassName = "FunctionPass Printer: " + PassToPrintName;
 220     }
 221
 222   virtual bool runOnFunction(Function &F) {
 223     if (!Quiet)
 224       Out << "Printing analysis '" << PassToPrint->getPassName()
 225           << "' for function '" << F.getName() << "':\n";
 226
 227     // Get and print pass...
 228     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 229             F.getParent());
 230     return false;
 231   }
 232
 233   virtual const char *getPassName() const { return PassName.c_str(); }
 234
 235   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 236     AU.addRequiredID(PassToPrint->getTypeInfo());
 237     AU.setPreservesAll();
 238   }
 239 };
 240
 241 char FunctionPassPrinter::ID = 0;
 242
 243 struct LoopPassPrinter : public LoopPass {
 244   static char ID;
 245   const PassInfo *PassToPrint;
 246   raw_ostream &Out;
 247   std::string PassName;
 248
 249   LoopPassPrinter(const PassInfo *PI, raw_ostream &out) :
 250     LoopPass(ID), PassToPrint(PI), Out(out) {
 251       std::string PassToPrintName =  PassToPrint->getPassName();
 252       PassName = "LoopPass Printer: " + PassToPrintName;
 253     }
 254
 255
 256   virtual bool runOnLoop(Loop *L, LPPassManager &LPM) {
 257     if (!Quiet)
 258       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 259
 260     // Get and print pass...
 261     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 262                         L->getHeader()->getParent()->getParent());
 263     return false;
 264   }
 265
 266   virtual const char *getPassName() const { return PassName.c_str(); }
 267
 268   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 269     AU.addRequiredID(PassToPrint->getTypeInfo());
 270     AU.setPreservesAll();
 271   }
 272 };
 273
 274 char LoopPassPrinter::ID = 0;
 275
 276 struct RegionPassPrinter : public RegionPass {
 277   static char ID;
 278   const PassInfo *PassToPrint;
 279   raw_ostream &Out;
 280   std::string PassName;
 281
 282   RegionPassPrinter(const PassInfo *PI, raw_ostream &out) : RegionPass(ID),
 283     PassToPrint(PI), Out(out) {
 284     std::string PassToPrintName =  PassToPrint->getPassName();
 285     PassName = "RegionPass Printer: " + PassToPrintName;
 286   }
 287
 288   virtual bool runOnRegion(Region *R, RGPassManager &RGM) {
 289     if (!Quiet) {
 290       Out << "Printing analysis '" << PassToPrint->getPassName() << "' for "
 291         << "region: '" << R->getNameStr() << "' in function '"
 292         << R->getEntry()->getParent()->getNameStr() << "':\n";
 293     }
 294     // Get and print pass...
 295    getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 296                        R->getEntry()->getParent()->getParent());
 297     return false;
 298   }
 299
 300   virtual const char *getPassName() const { return PassName.c_str(); }
 301
 302   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 303     AU.addRequiredID(PassToPrint->getTypeInfo());
 304     AU.setPreservesAll();
 305   }
 306 };
 307
 308 char RegionPassPrinter::ID = 0;
 309
 310 struct BasicBlockPassPrinter : public BasicBlockPass {
 311   const PassInfo *PassToPrint;
 312   raw_ostream &Out;
 313   static char ID;
 314   std::string PassName;
 315
 316   BasicBlockPassPrinter(const PassInfo *PI, raw_ostream &out)
 317     : BasicBlockPass(ID), PassToPrint(PI), Out(out) {
 318       std::string PassToPrintName =  PassToPrint->getPassName();
 319       PassName = "BasicBlockPass Printer: " + PassToPrintName;
 320     }
 321
 322   virtual bool runOnBasicBlock(BasicBlock &BB) {
 323     if (!Quiet)
 324       Out << "Printing Analysis info for BasicBlock '" << BB.getName()
 325           << "': Pass " << PassToPrint->getPassName() << ":\n";
 326
 327     // Get and print pass...
 328     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 329             BB.getParent()->getParent());
 330     return false;
 331   }
 332
 333   virtual const char *getPassName() const { return PassName.c_str(); }
 334
 335   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 336     AU.addRequiredID(PassToPrint->getTypeInfo());
 337     AU.setPreservesAll();
 338   }
 339 };
 340
 341 char BasicBlockPassPrinter::ID = 0;
 342
 343 struct BreakpointPrinter : public FunctionPass {
 344   raw_ostream &Out;
 345   static char ID;
 346
 347   BreakpointPrinter(raw_ostream &out)
 348     : FunctionPass(ID), Out(out) {
 349     }
 350
 351   virtual bool runOnFunction(Function &F) {
 352     for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
 353       BasicBlock::const_iterator BI = I->end();
 354       --BI;
 355       do {
 356         const Instruction *In = BI;
 357         const DebugLoc DL = In->getDebugLoc();
 358         if (!DL.isUnknown()) {
 359           DIScope S(DL.getScope(getGlobalContext()));
 360           Out << S.getFilename() << " " << DL.getLine() << "\n";
 361           break;
 362         }
 363         --BI;
 364       } while (BI != I->begin());
 365       break;
 366     }
 367     BasicBlock &EntryBB = F.getEntryBlock();
 368     for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
 369       BasicBlock *BB = I;
 370       if (BB == &EntryBB) continue;
 371       for (BasicBlock::iterator BI = I->begin(), BE = I->end(); BI != BE; ++BI)
 372         if (CallInst *CI = dyn_cast<CallInst>(BI)) {
 373           const DebugLoc DL = CI->getDebugLoc();
 374           if (!DL.isUnknown()) {
 375             DIScope S(DL.getScope(getGlobalContext()));
 376             Out << S.getFilename() << " " << DL.getLine() << "\n";
 377           }
 378         }
 379     }
 380     return false;
 381   }
 382
 383   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 384     AU.setPreservesAll();
 385   }
 386 };
 387
 388 char BreakpointPrinter::ID = 0;
 389
 390 inline void addPass(PassManagerBase &PM, Pass *P) {
 391   // Add the pass to the pass manager...
 392   PM.add(P);
 393
 394   // If we are verifying all of the intermediate steps, add the verifier...
 395   if (VerifyEach) PM.add(createVerifierPass());
 396 }
 397
 398 /// AddOptimizationPasses - This routine adds optimization passes
 399 /// based on selected optimization level, OptLevel. This routine
 400 /// duplicates llvm-gcc behaviour.
 401 ///
 402 /// OptLevel - Optimization Level
 403 void AddOptimizationPasses(PassManagerBase &MPM, PassManagerBase &FPM,
 404                            unsigned OptLevel) {
 405   createStandardFunctionPasses(&FPM, OptLevel);
 406
 407   llvm::Pass *InliningPass = 0;
 408   if (DisableInline) {
 409     // No inlining pass
 410   } else if (OptLevel) {
 411     unsigned Threshold = 225;
 412     if (OptLevel > 2)
 413       Threshold = 275;
 414     InliningPass = createFunctionInliningPass(Threshold);
 415   } else {
 416     InliningPass = createAlwaysInlinerPass();
 417   }
 418   createStandardModulePasses(&MPM, OptLevel,
 419                              /*OptimizeSize=*/ false,
 420                              UnitAtATime,
 421                              /*UnrollLoops=*/ OptLevel > 1,
 422                              !DisableSimplifyLibCalls,
 423                              /*HaveExceptions=*/ true,
 424                              InliningPass);
 425 }
 426
 427 void AddStandardCompilePasses(PassManagerBase &PM) {
 428   PM.add(createVerifierPass());                  // Verify that input is correct
 429
 430   addPass(PM, createLowerSetJmpPass());          // Lower llvm.setjmp/.longjmp
 431
 432   // If the -strip-debug command line option was specified, do it.
 433   if (StripDebug)
 434     addPass(PM, createStripSymbolsPass(true));
 435
 436   if (DisableOptimizations) return;
 437
 438   llvm::Pass *InliningPass = !DisableInline ? createFunctionInliningPass() : 0;
 439
 440   // -std-compile-opts adds the same module passes as -O3.
 441   createStandardModulePasses(&PM, 3,
 442                              /*OptimizeSize=*/ false,
 443                              /*UnitAtATime=*/ true,
 444                              /*UnrollLoops=*/ true,
 445                              /*SimplifyLibCalls=*/ true,
 446                              /*HaveExceptions=*/ true,
 447                              InliningPass);
 448 }
 449
 450 void AddStandardLinkPasses(PassManagerBase &PM) {
 451   PM.add(createVerifierPass());                  // Verify that input is correct
 452
 453   // If the -strip-debug command line option was specified, do it.
 454   if (StripDebug)
 455     addPass(PM, createStripSymbolsPass(true));
 456
 457   if (DisableOptimizations) return;
 458
 459   createStandardLTOPasses(&PM, /*Internalize=*/ !DisableInternalize,
 460                           /*RunInliner=*/ !DisableInline,
 461                           /*VerifyEach=*/ VerifyEach);
 462 }
 463
 464 } // anonymous namespace
 465
 466
 467 //===----------------------------------------------------------------------===//
 468 // main for opt
 469 //
 470 int main(int argc, char **argv) {
 471   sys::PrintStackTraceOnErrorSignal();
 472   llvm::PrettyStackTraceProgram X(argc, argv);
 473
 474   // Enable debug stream buffering.
 475   EnableDebugBuffering = true;
 476
 477   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 478   LLVMContext &Context = getGlobalContext();
 479
 480   // Initialize passes
 481   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 482   initializeCore(Registry);
 483   initializeScalarOpts(Registry);
 484   initializeIPO(Registry);
 485   initializeAnalysis(Registry);
 486   initializeIPA(Registry);
 487   initializeTransformUtils(Registry);
 488   initializeInstCombine(Registry);
 489   initializeInstrumentation(Registry);
 490   initializeTarget(Registry);
 491
 492   cl::ParseCommandLineOptions(argc, argv,
 493     "llvm .bc -> .bc modular optimizer and analysis printer\n");
 494
 495   if (AnalyzeOnly && NoOutput) {
 496     errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
 497     return 1;
 498   }
 499
 500   // Allocate a full target machine description only if necessary.
 501   // FIXME: The choice of target should be controllable on the command line.
 502   std::auto_ptr<TargetMachine> target;
 503
 504   SMDiagnostic Err;
 505
 506   // Load the input module...
 507   std::auto_ptr<Module> M;
 508   M.reset(ParseIRFile(InputFilename, Err, Context));
 509
 510   if (M.get() == 0) {
 511     Err.Print(argv[0], errs());
 512     return 1;
 513   }
 514
 515   // Figure out what stream we are supposed to write to...
 516   OwningPtr<tool_output_file> Out;
 517   if (NoOutput) {
 518     if (!OutputFilename.empty())
 519       errs() << "WARNING: The -o (output filename) option is ignored when\n"
 520                 "the --disable-output option is used.\n";
 521   } else {
 522     // Default to standard output.
 523     if (OutputFilename.empty())
 524       OutputFilename = "-";
 525
 526     std::string ErrorInfo;
 527     Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 528                                    raw_fd_ostream::F_Binary));
 529     if (!ErrorInfo.empty()) {
 530       errs() << ErrorInfo << '\n';
 531       return 1;
 532     }
 533   }
 534
 535   // If the output is set to be emitted to standard out, and standard out is a
 536   // console, print out a warning message and refuse to do it.  We don't
 537   // impress anyone by spewing tons of binary goo to a terminal.
 538   if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
 539     if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
 540       NoOutput = true;
 541
 542   // Create a PassManager to hold and optimize the collection of passes we are
 543   // about to build...
 544   //
 545   PassManager Passes;
 546
 547   // Add an appropriate TargetData instance for this module...
 548   TargetData *TD = 0;
 549   const std::string &ModuleDataLayout = M.get()->getDataLayout();
 550   if (!ModuleDataLayout.empty())
 551     TD = new TargetData(ModuleDataLayout);
 552   else if (!DefaultDataLayout.empty())
 553     TD = new TargetData(DefaultDataLayout);
 554
 555   if (TD)
 556     Passes.add(TD);
 557
 558   OwningPtr<PassManager> FPasses;
 559   if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
 560     FPasses.reset(new PassManager());
 561     if (TD)
 562       FPasses->add(new TargetData(*TD));
 563   }
 564
 565   if (PrintBreakpoints) {
 566     // Default to standard output.
 567     if (!Out) {
 568       if (OutputFilename.empty())
 569         OutputFilename = "-";
 570
 571       std::string ErrorInfo;
 572       Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 573                                      raw_fd_ostream::F_Binary));
 574       if (!ErrorInfo.empty()) {
 575         errs() << ErrorInfo << '\n';
 576         return 1;
 577       }
 578     }
 579     Passes.add(new BreakpointPrinter(Out->os()));
 580     NoOutput = true;
 581   }
 582
 583   // If the -strip-debug command line option was specified, add it.  If
 584   // -std-compile-opts was also specified, it will handle StripDebug.
 585   if (StripDebug && !StandardCompileOpts)
 586     addPass(Passes, createStripSymbolsPass(true));
 587
 588   // Create a new optimization pass for each one specified on the command line
 589   for (unsigned i = 0; i < PassList.size(); ++i) {
 590     // Check to see if -std-compile-opts was specified before this option.  If
 591     // so, handle it.
 592     if (StandardCompileOpts &&
 593         StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
 594       AddStandardCompilePasses(Passes);
 595       StandardCompileOpts = false;
 596     }
 597
 598     if (StandardLinkOpts &&
 599         StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
 600       AddStandardLinkPasses(Passes);
 601       StandardLinkOpts = false;
 602     }
 603
 604     if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
 605       AddOptimizationPasses(Passes, *FPasses, 1);
 606       OptLevelO1 = false;
 607     }
 608
 609     if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
 610       AddOptimizationPasses(Passes, *FPasses, 2);
 611       OptLevelO2 = false;
 612     }
 613
 614     if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
 615       AddOptimizationPasses(Passes, *FPasses, 3);
 616       OptLevelO3 = false;
 617     }
 618
 619     const PassInfo *PassInf = PassList[i];
 620     Pass *P = 0;
 621     if (PassInf->getNormalCtor())
 622       P = PassInf->getNormalCtor()();
 623     else
 624       errs() << argv[0] << ": cannot create pass: "
 625              << PassInf->getPassName() << "\n";
 626     if (P) {
 627       PassKind Kind = P->getPassKind();
 628       addPass(Passes, P);
 629
 630       if (AnalyzeOnly) {
 631         switch (Kind) {
 632         case PT_BasicBlock:
 633           Passes.add(new BasicBlockPassPrinter(PassInf, Out->os()));
 634           break;
 635         case PT_Region:
 636           Passes.add(new RegionPassPrinter(PassInf, Out->os()));
 637           break;
 638         case PT_Loop:
 639           Passes.add(new LoopPassPrinter(PassInf, Out->os()));
 640           break;
 641         case PT_Function:
 642           Passes.add(new FunctionPassPrinter(PassInf, Out->os()));
 643           break;
 644         case PT_CallGraphSCC:
 645           Passes.add(new CallGraphSCCPassPrinter(PassInf, Out->os()));
 646           break;
 647         default:
 648           Passes.add(new ModulePassPrinter(PassInf, Out->os()));
 649           break;
 650         }
 651       }
 652     }
 653
 654     if (PrintEachXForm)
 655       Passes.add(createPrintModulePass(&errs()));
 656   }
 657
 658   // If -std-compile-opts was specified at the end of the pass list, add them.
 659   if (StandardCompileOpts) {
 660     AddStandardCompilePasses(Passes);
 661     StandardCompileOpts = false;
 662   }
 663
 664   if (StandardLinkOpts) {
 665     AddStandardLinkPasses(Passes);
 666     StandardLinkOpts = false;
 667   }
 668
 669   if (OptLevelO1)
 670     AddOptimizationPasses(Passes, *FPasses, 1);
 671
 672   if (OptLevelO2)
 673     AddOptimizationPasses(Passes, *FPasses, 2);
 674
 675   if (OptLevelO3)
 676     AddOptimizationPasses(Passes, *FPasses, 3);
 677
 678   if (OptLevelO1 || OptLevelO2 || OptLevelO3)
 679     FPasses->run(*M.get());
 680
 681   // Check that the module is well formed on completion of optimization
 682   if (!NoVerify && !VerifyEach)
 683     Passes.add(createVerifierPass());
 684
 685   // Write bitcode or assembly to the output as the last step...
 686   if (!NoOutput && !AnalyzeOnly) {
 687     if (OutputAssembly)
 688       Passes.add(createPrintModulePass(&Out->os()));
 689     else
 690       Passes.add(createBitcodeWriterPass(Out->os()));
 691   }
 692
 693   // Now that we have all of the passes ready, run them.
 694   Passes.run(*M.get());
 695
 696   // Declare success.
 697   if (!NoOutput || PrintBreakpoints)
 698     Out->keep();
 699
 700   return 0;
 701 }