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/TargetLibraryInfo.h"
  28 #include "llvm/Target/TargetMachine.h"
  29 #include "llvm/ADT/StringSet.h"
  30 #include "llvm/ADT/Triple.h"
  31 #include "llvm/Support/PassNameParser.h"
  32 #include "llvm/Support/Signals.h"
  33 #include "llvm/Support/Debug.h"
  34 #include "llvm/Support/IRReader.h"
  35 #include "llvm/Support/ManagedStatic.h"
  36 #include "llvm/Support/PluginLoader.h"
  37 #include "llvm/Support/PrettyStackTrace.h"
  38 #include "llvm/Support/StandardPasses.h"
  39 #include "llvm/Support/SystemUtils.h"
  40 #include "llvm/Support/ToolOutputFile.h"
  41 #include "llvm/LinkAllPasses.h"
  42 #include "llvm/LinkAllVMCore.h"
  43 #include <memory>
  44 #include <algorithm>
  45 using namespace llvm;
  46
  47 // The OptimizationList is automatically populated with registered Passes by the
  48 // PassNameParser.
  49 //
  50 static cl::list<const PassInfo*, bool, PassNameParser>
  51 PassList(cl::desc("Optimizations available:"));
  52
  53 // Other command line options...
  54 //
  55 static cl::opt<std::string>
  56 InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
  57     cl::init("-"), cl::value_desc("filename"));
  58
  59 static cl::opt<std::string>
  60 OutputFilename("o", cl::desc("Override output filename"),
  61                cl::value_desc("filename"));
  62
  63 static cl::opt<bool>
  64 Force("f", cl::desc("Enable binary output on terminals"));
  65
  66 static cl::opt<bool>
  67 PrintEachXForm("p", cl::desc("Print module after each transformation"));
  68
  69 static cl::opt<bool>
  70 NoOutput("disable-output",
  71          cl::desc("Do not write result bitcode file"), cl::Hidden);
  72
  73 static cl::opt<bool>
  74 OutputAssembly("S", cl::desc("Write output as LLVM assembly"));
  75
  76 static cl::opt<bool>
  77 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
  78
  79 static cl::opt<bool>
  80 VerifyEach("verify-each", cl::desc("Verify after each transform"));
  81
  82 static cl::opt<bool>
  83 StripDebug("strip-debug",
  84            cl::desc("Strip debugger symbol info from translation unit"));
  85
  86 static cl::opt<bool>
  87 DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
  88
  89 static cl::opt<bool>
  90 DisableOptimizations("disable-opt",
  91                      cl::desc("Do not run any optimization passes"));
  92
  93 static cl::opt<bool>
  94 DisableInternalize("disable-internalize",
  95                    cl::desc("Do not mark all symbols as internal"));
  96
  97 static cl::opt<bool>
  98 StandardCompileOpts("std-compile-opts",
  99                    cl::desc("Include the standard compile time optimizations"));
 100
 101 static cl::opt<bool>
 102 StandardLinkOpts("std-link-opts",
 103                  cl::desc("Include the standard link time optimizations"));
 104
 105 static cl::opt<bool>
 106 OptLevelO1("O1",
 107            cl::desc("Optimization level 1. Similar to llvm-gcc -O1"));
 108
 109 static cl::opt<bool>
 110 OptLevelO2("O2",
 111            cl::desc("Optimization level 2. Similar to llvm-gcc -O2"));
 112
 113 static cl::opt<bool>
 114 OptLevelO3("O3",
 115            cl::desc("Optimization level 3. Similar to llvm-gcc -O3"));
 116
 117 static cl::opt<bool>
 118 UnitAtATime("funit-at-a-time",
 119             cl::desc("Enable IPO. This is same as llvm-gcc's -funit-at-a-time"),
 120             cl::init(true));
 121
 122 static cl::opt<bool>
 123 DisableSimplifyLibCalls("disable-simplify-libcalls",
 124                         cl::desc("Disable simplify-libcalls"));
 125
 126 static cl::opt<bool>
 127 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
 128
 129 static cl::alias
 130 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
 131
 132 static cl::opt<bool>
 133 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
 134
 135 static cl::opt<bool>
 136 PrintBreakpoints("print-breakpoints-for-testing",
 137                  cl::desc("Print select breakpoints location for testing"));
 138
 139 static cl::opt<std::string>
 140 DefaultDataLayout("default-data-layout",
 141           cl::desc("data layout string to use if not specified by module"),
 142           cl::value_desc("layout-string"), cl::init(""));
 143
 144 // ---------- Define Printers for module and function passes ------------
 145 namespace {
 146
 147 struct CallGraphSCCPassPrinter : public CallGraphSCCPass {
 148   static char ID;
 149   const PassInfo *PassToPrint;
 150   raw_ostream &Out;
 151   std::string PassName;
 152
 153   CallGraphSCCPassPrinter(const PassInfo *PI, raw_ostream &out) :
 154     CallGraphSCCPass(ID), PassToPrint(PI), Out(out) {
 155       std::string PassToPrintName =  PassToPrint->getPassName();
 156       PassName = "CallGraphSCCPass Printer: " + PassToPrintName;
 157     }
 158
 159   virtual bool runOnSCC(CallGraphSCC &SCC) {
 160     if (!Quiet)
 161       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 162
 163     // Get and print pass...
 164     for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
 165       Function *F = (*I)->getFunction();
 166       if (F)
 167         getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 168                                                               F->getParent());
 169     }
 170     return false;
 171   }
 172
 173   virtual const char *getPassName() const { return PassName.c_str(); }
 174
 175   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 176     AU.addRequiredID(PassToPrint->getTypeInfo());
 177     AU.setPreservesAll();
 178   }
 179 };
 180
 181 char CallGraphSCCPassPrinter::ID = 0;
 182
 183 struct ModulePassPrinter : public ModulePass {
 184   static char ID;
 185   const PassInfo *PassToPrint;
 186   raw_ostream &Out;
 187   std::string PassName;
 188
 189   ModulePassPrinter(const PassInfo *PI, raw_ostream &out)
 190     : ModulePass(ID), PassToPrint(PI), Out(out) {
 191       std::string PassToPrintName =  PassToPrint->getPassName();
 192       PassName = "ModulePass Printer: " + PassToPrintName;
 193     }
 194
 195   virtual bool runOnModule(Module &M) {
 196     if (!Quiet)
 197       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 198
 199     // Get and print pass...
 200     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out, &M);
 201     return false;
 202   }
 203
 204   virtual const char *getPassName() const { return PassName.c_str(); }
 205
 206   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 207     AU.addRequiredID(PassToPrint->getTypeInfo());
 208     AU.setPreservesAll();
 209   }
 210 };
 211
 212 char ModulePassPrinter::ID = 0;
 213 struct FunctionPassPrinter : public FunctionPass {
 214   const PassInfo *PassToPrint;
 215   raw_ostream &Out;
 216   static char ID;
 217   std::string PassName;
 218
 219   FunctionPassPrinter(const PassInfo *PI, raw_ostream &out)
 220     : FunctionPass(ID), PassToPrint(PI), Out(out) {
 221       std::string PassToPrintName =  PassToPrint->getPassName();
 222       PassName = "FunctionPass Printer: " + PassToPrintName;
 223     }
 224
 225   virtual bool runOnFunction(Function &F) {
 226     if (!Quiet)
 227       Out << "Printing analysis '" << PassToPrint->getPassName()
 228           << "' for function '" << F.getName() << "':\n";
 229
 230     // Get and print pass...
 231     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 232             F.getParent());
 233     return false;
 234   }
 235
 236   virtual const char *getPassName() const { return PassName.c_str(); }
 237
 238   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 239     AU.addRequiredID(PassToPrint->getTypeInfo());
 240     AU.setPreservesAll();
 241   }
 242 };
 243
 244 char FunctionPassPrinter::ID = 0;
 245
 246 struct LoopPassPrinter : public LoopPass {
 247   static char ID;
 248   const PassInfo *PassToPrint;
 249   raw_ostream &Out;
 250   std::string PassName;
 251
 252   LoopPassPrinter(const PassInfo *PI, raw_ostream &out) :
 253     LoopPass(ID), PassToPrint(PI), Out(out) {
 254       std::string PassToPrintName =  PassToPrint->getPassName();
 255       PassName = "LoopPass Printer: " + PassToPrintName;
 256     }
 257
 258
 259   virtual bool runOnLoop(Loop *L, LPPassManager &LPM) {
 260     if (!Quiet)
 261       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 262
 263     // Get and print pass...
 264     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 265                         L->getHeader()->getParent()->getParent());
 266     return false;
 267   }
 268
 269   virtual const char *getPassName() const { return PassName.c_str(); }
 270
 271   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 272     AU.addRequiredID(PassToPrint->getTypeInfo());
 273     AU.setPreservesAll();
 274   }
 275 };
 276
 277 char LoopPassPrinter::ID = 0;
 278
 279 struct RegionPassPrinter : public RegionPass {
 280   static char ID;
 281   const PassInfo *PassToPrint;
 282   raw_ostream &Out;
 283   std::string PassName;
 284
 285   RegionPassPrinter(const PassInfo *PI, raw_ostream &out) : RegionPass(ID),
 286     PassToPrint(PI), Out(out) {
 287     std::string PassToPrintName =  PassToPrint->getPassName();
 288     PassName = "RegionPass Printer: " + PassToPrintName;
 289   }
 290
 291   virtual bool runOnRegion(Region *R, RGPassManager &RGM) {
 292     if (!Quiet) {
 293       Out << "Printing analysis '" << PassToPrint->getPassName() << "' for "
 294         << "region: '" << R->getNameStr() << "' in function '"
 295         << R->getEntry()->getParent()->getNameStr() << "':\n";
 296     }
 297     // Get and print pass...
 298    getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 299                        R->getEntry()->getParent()->getParent());
 300     return false;
 301   }
 302
 303   virtual const char *getPassName() const { return PassName.c_str(); }
 304
 305   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 306     AU.addRequiredID(PassToPrint->getTypeInfo());
 307     AU.setPreservesAll();
 308   }
 309 };
 310
 311 char RegionPassPrinter::ID = 0;
 312
 313 struct BasicBlockPassPrinter : public BasicBlockPass {
 314   const PassInfo *PassToPrint;
 315   raw_ostream &Out;
 316   static char ID;
 317   std::string PassName;
 318
 319   BasicBlockPassPrinter(const PassInfo *PI, raw_ostream &out)
 320     : BasicBlockPass(ID), PassToPrint(PI), Out(out) {
 321       std::string PassToPrintName =  PassToPrint->getPassName();
 322       PassName = "BasicBlockPass Printer: " + PassToPrintName;
 323     }
 324
 325   virtual bool runOnBasicBlock(BasicBlock &BB) {
 326     if (!Quiet)
 327       Out << "Printing Analysis info for BasicBlock '" << BB.getName()
 328           << "': Pass " << PassToPrint->getPassName() << ":\n";
 329
 330     // Get and print pass...
 331     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 332             BB.getParent()->getParent());
 333     return false;
 334   }
 335
 336   virtual const char *getPassName() const { return PassName.c_str(); }
 337
 338   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 339     AU.addRequiredID(PassToPrint->getTypeInfo());
 340     AU.setPreservesAll();
 341   }
 342 };
 343
 344 char BasicBlockPassPrinter::ID = 0;
 345
 346 struct BreakpointPrinter : public ModulePass {
 347   raw_ostream &Out;
 348   static char ID;
 349
 350   BreakpointPrinter(raw_ostream &out)
 351     : ModulePass(ID), Out(out) {
 352     }
 353
 354   void getContextName(DIDescriptor Context, std::string &N) {
 355     if (Context.isNameSpace()) {
 356       DINameSpace NS(Context);
 357       if (!NS.getName().empty()) {
 358         getContextName(NS.getContext(), N);
 359         N = N + NS.getName().str() + "::";
 360       }
 361     } else if (Context.isType()) {
 362       DIType TY(Context);
 363       if (!TY.getName().empty()) {
 364         getContextName(TY.getContext(), N);
 365         N = N + TY.getName().str() + "::";
 366       }
 367     }
 368   }
 369
 370   virtual bool runOnModule(Module &M) {
 371     StringSet<> Processed;
 372     if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp"))
 373       for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
 374         std::string Name;
 375         DISubprogram SP(NMD->getOperand(i));
 376         if (SP.Verify())
 377           getContextName(SP.getContext(), Name);
 378         Name = Name + SP.getDisplayName().str();
 379         if (!Name.empty() && Processed.insert(Name)) {
 380           Out << Name << "\n";
 381         }
 382       }
 383     return false;
 384   }
 385
 386   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 387     AU.setPreservesAll();
 388   }
 389 };
 390
 391 char BreakpointPrinter::ID = 0;
 392
 393 inline void addPass(PassManagerBase &PM, Pass *P) {
 394   // Add the pass to the pass manager...
 395   PM.add(P);
 396
 397   // If we are verifying all of the intermediate steps, add the verifier...
 398   if (VerifyEach) PM.add(createVerifierPass());
 399 }
 400
 401 /// AddOptimizationPasses - This routine adds optimization passes
 402 /// based on selected optimization level, OptLevel. This routine
 403 /// duplicates llvm-gcc behaviour.
 404 ///
 405 /// OptLevel - Optimization Level
 406 void AddOptimizationPasses(PassManagerBase &MPM, PassManagerBase &FPM,
 407                            unsigned OptLevel) {
 408   createStandardFunctionPasses(&FPM, OptLevel);
 409
 410   llvm::Pass *InliningPass = 0;
 411   if (DisableInline) {
 412     // No inlining pass
 413   } else if (OptLevel) {
 414     unsigned Threshold = 225;
 415     if (OptLevel > 2)
 416       Threshold = 275;
 417     InliningPass = createFunctionInliningPass(Threshold);
 418   } else {
 419     InliningPass = createAlwaysInlinerPass();
 420   }
 421   createStandardModulePasses(&MPM, OptLevel,
 422                              /*OptimizeSize=*/ false,
 423                              UnitAtATime,
 424                              /*UnrollLoops=*/ OptLevel > 1,
 425                              !DisableSimplifyLibCalls,
 426                              /*HaveExceptions=*/ true,
 427                              InliningPass);
 428 }
 429
 430 void AddStandardCompilePasses(PassManagerBase &PM) {
 431   PM.add(createVerifierPass());                  // Verify that input is correct
 432
 433   addPass(PM, createLowerSetJmpPass());          // Lower llvm.setjmp/.longjmp
 434
 435   // If the -strip-debug command line option was specified, do it.
 436   if (StripDebug)
 437     addPass(PM, createStripSymbolsPass(true));
 438
 439   if (DisableOptimizations) return;
 440
 441   llvm::Pass *InliningPass = !DisableInline ? createFunctionInliningPass() : 0;
 442
 443   // -std-compile-opts adds the same module passes as -O3.
 444   createStandardModulePasses(&PM, 3,
 445                              /*OptimizeSize=*/ false,
 446                              /*UnitAtATime=*/ true,
 447                              /*UnrollLoops=*/ true,
 448                              !DisableSimplifyLibCalls,
 449                              /*HaveExceptions=*/ true,
 450                              InliningPass);
 451 }
 452
 453 void AddStandardLinkPasses(PassManagerBase &PM) {
 454   PM.add(createVerifierPass());                  // Verify that input is correct
 455
 456   // If the -strip-debug command line option was specified, do it.
 457   if (StripDebug)
 458     addPass(PM, createStripSymbolsPass(true));
 459
 460   if (DisableOptimizations) return;
 461
 462   createStandardLTOPasses(&PM, /*Internalize=*/ !DisableInternalize,
 463                           /*RunInliner=*/ !DisableInline,
 464                           /*VerifyEach=*/ VerifyEach);
 465 }
 466
 467 } // anonymous namespace
 468
 469
 470 //===----------------------------------------------------------------------===//
 471 // main for opt
 472 //
 473 int main(int argc, char **argv) {
 474   sys::PrintStackTraceOnErrorSignal();
 475   llvm::PrettyStackTraceProgram X(argc, argv);
 476
 477   // Enable debug stream buffering.
 478   EnableDebugBuffering = true;
 479
 480   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 481   LLVMContext &Context = getGlobalContext();
 482
 483   // Initialize passes
 484   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 485   initializeCore(Registry);
 486   initializeScalarOpts(Registry);
 487   initializeIPO(Registry);
 488   initializeAnalysis(Registry);
 489   initializeIPA(Registry);
 490   initializeTransformUtils(Registry);
 491   initializeInstCombine(Registry);
 492   initializeInstrumentation(Registry);
 493   initializeTarget(Registry);
 494
 495   cl::ParseCommandLineOptions(argc, argv,
 496     "llvm .bc -> .bc modular optimizer and analysis printer\n");
 497
 498   if (AnalyzeOnly && NoOutput) {
 499     errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
 500     return 1;
 501   }
 502
 503   // Allocate a full target machine description only if necessary.
 504   // FIXME: The choice of target should be controllable on the command line.
 505   std::auto_ptr<TargetMachine> target;
 506
 507   SMDiagnostic Err;
 508
 509   // Load the input module...
 510   std::auto_ptr<Module> M;
 511   M.reset(ParseIRFile(InputFilename, Err, Context));
 512
 513   if (M.get() == 0) {
 514     Err.Print(argv[0], errs());
 515     return 1;
 516   }
 517
 518   // Figure out what stream we are supposed to write to...
 519   OwningPtr<tool_output_file> Out;
 520   if (NoOutput) {
 521     if (!OutputFilename.empty())
 522       errs() << "WARNING: The -o (output filename) option is ignored when\n"
 523                 "the --disable-output option is used.\n";
 524   } else {
 525     // Default to standard output.
 526     if (OutputFilename.empty())
 527       OutputFilename = "-";
 528
 529     std::string ErrorInfo;
 530     Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 531                                    raw_fd_ostream::F_Binary));
 532     if (!ErrorInfo.empty()) {
 533       errs() << ErrorInfo << '\n';
 534       return 1;
 535     }
 536   }
 537
 538   // If the output is set to be emitted to standard out, and standard out is a
 539   // console, print out a warning message and refuse to do it.  We don't
 540   // impress anyone by spewing tons of binary goo to a terminal.
 541   if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
 542     if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
 543       NoOutput = true;
 544
 545   // Create a PassManager to hold and optimize the collection of passes we are
 546   // about to build.
 547   //
 548   PassManager Passes;
 549
 550   // Add an appropriate TargetLibraryInfo pass for the module's triple.
 551   TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));
 552
 553   // The -disable-simplify-libcalls flag actually disables all builtin optzns.
 554   if (DisableSimplifyLibCalls)
 555     TLI->disableAllFunctions();
 556   Passes.add(TLI);
 557
 558   // Add an appropriate TargetData instance for this module.
 559   TargetData *TD = 0;
 560   const std::string &ModuleDataLayout = M.get()->getDataLayout();
 561   if (!ModuleDataLayout.empty())
 562     TD = new TargetData(ModuleDataLayout);
 563   else if (!DefaultDataLayout.empty())
 564     TD = new TargetData(DefaultDataLayout);
 565
 566   if (TD)
 567     Passes.add(TD);
 568
 569   OwningPtr<PassManager> FPasses;
 570   if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
 571     FPasses.reset(new PassManager());
 572     if (TD)
 573       FPasses->add(new TargetData(*TD));
 574   }
 575
 576   if (PrintBreakpoints) {
 577     // Default to standard output.
 578     if (!Out) {
 579       if (OutputFilename.empty())
 580         OutputFilename = "-";
 581
 582       std::string ErrorInfo;
 583       Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 584                                      raw_fd_ostream::F_Binary));
 585       if (!ErrorInfo.empty()) {
 586         errs() << ErrorInfo << '\n';
 587         return 1;
 588       }
 589     }
 590     Passes.add(new BreakpointPrinter(Out->os()));
 591     NoOutput = true;
 592   }
 593
 594   // If the -strip-debug command line option was specified, add it.  If
 595   // -std-compile-opts was also specified, it will handle StripDebug.
 596   if (StripDebug && !StandardCompileOpts)
 597     addPass(Passes, createStripSymbolsPass(true));
 598
 599   // Create a new optimization pass for each one specified on the command line
 600   for (unsigned i = 0; i < PassList.size(); ++i) {
 601     // Check to see if -std-compile-opts was specified before this option.  If
 602     // so, handle it.
 603     if (StandardCompileOpts &&
 604         StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
 605       AddStandardCompilePasses(Passes);
 606       StandardCompileOpts = false;
 607     }
 608
 609     if (StandardLinkOpts &&
 610         StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
 611       AddStandardLinkPasses(Passes);
 612       StandardLinkOpts = false;
 613     }
 614
 615     if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
 616       AddOptimizationPasses(Passes, *FPasses, 1);
 617       OptLevelO1 = false;
 618     }
 619
 620     if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
 621       AddOptimizationPasses(Passes, *FPasses, 2);
 622       OptLevelO2 = false;
 623     }
 624
 625     if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
 626       AddOptimizationPasses(Passes, *FPasses, 3);
 627       OptLevelO3 = false;
 628     }
 629
 630     const PassInfo *PassInf = PassList[i];
 631     Pass *P = 0;
 632     if (PassInf->getNormalCtor())
 633       P = PassInf->getNormalCtor()();
 634     else
 635       errs() << argv[0] << ": cannot create pass: "
 636              << PassInf->getPassName() << "\n";
 637     if (P) {
 638       PassKind Kind = P->getPassKind();
 639       addPass(Passes, P);
 640
 641       if (AnalyzeOnly) {
 642         switch (Kind) {
 643         case PT_BasicBlock:
 644           Passes.add(new BasicBlockPassPrinter(PassInf, Out->os()));
 645           break;
 646         case PT_Region:
 647           Passes.add(new RegionPassPrinter(PassInf, Out->os()));
 648           break;
 649         case PT_Loop:
 650           Passes.add(new LoopPassPrinter(PassInf, Out->os()));
 651           break;
 652         case PT_Function:
 653           Passes.add(new FunctionPassPrinter(PassInf, Out->os()));
 654           break;
 655         case PT_CallGraphSCC:
 656           Passes.add(new CallGraphSCCPassPrinter(PassInf, Out->os()));
 657           break;
 658         default:
 659           Passes.add(new ModulePassPrinter(PassInf, Out->os()));
 660           break;
 661         }
 662       }
 663     }
 664
 665     if (PrintEachXForm)
 666       Passes.add(createPrintModulePass(&errs()));
 667   }
 668
 669   // If -std-compile-opts was specified at the end of the pass list, add them.
 670   if (StandardCompileOpts) {
 671     AddStandardCompilePasses(Passes);
 672     StandardCompileOpts = false;
 673   }
 674
 675   if (StandardLinkOpts) {
 676     AddStandardLinkPasses(Passes);
 677     StandardLinkOpts = false;
 678   }
 679
 680   if (OptLevelO1)
 681     AddOptimizationPasses(Passes, *FPasses, 1);
 682
 683   if (OptLevelO2)
 684     AddOptimizationPasses(Passes, *FPasses, 2);
 685
 686   if (OptLevelO3)
 687     AddOptimizationPasses(Passes, *FPasses, 3);
 688
 689   if (OptLevelO1 || OptLevelO2 || OptLevelO3)
 690     FPasses->run(*M.get());
 691
 692   // Check that the module is well formed on completion of optimization
 693   if (!NoVerify && !VerifyEach)
 694     Passes.add(createVerifierPass());
 695
 696   // Write bitcode or assembly to the output as the last step...
 697   if (!NoOutput && !AnalyzeOnly) {
 698     if (OutputAssembly)
 699       Passes.add(createPrintModulePass(&Out->os()));
 700     else
 701       Passes.add(createBitcodeWriterPass(Out->os()));
 702   }
 703
 704   // Before executing passes, print the final values of the LLVM options.
 705   cl::PrintOptionValues();
 706
 707   // Now that we have all of the passes ready, run them.
 708   Passes.run(*M.get());
 709
 710   // Declare success.
 711   if (!NoOutput || PrintBreakpoints)
 712     Out->keep();
 713
 714   return 0;
 715 }