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     BasicBlock &EntryBB = F.getEntryBlock();
 353     BasicBlock::const_iterator BI = EntryBB.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 != EntryBB.begin());
 365     return false;
 366   }
 367
 368   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 369     AU.setPreservesAll();
 370   }
 371 };
 372
 373 char BreakpointPrinter::ID = 0;
 374
 375 inline void addPass(PassManagerBase &PM, Pass *P) {
 376   // Add the pass to the pass manager...
 377   PM.add(P);
 378
 379   // If we are verifying all of the intermediate steps, add the verifier...
 380   if (VerifyEach) PM.add(createVerifierPass());
 381 }
 382
 383 /// AddOptimizationPasses - This routine adds optimization passes
 384 /// based on selected optimization level, OptLevel. This routine
 385 /// duplicates llvm-gcc behaviour.
 386 ///
 387 /// OptLevel - Optimization Level
 388 void AddOptimizationPasses(PassManagerBase &MPM, PassManagerBase &FPM,
 389                            unsigned OptLevel) {
 390   createStandardFunctionPasses(&FPM, OptLevel);
 391
 392   llvm::Pass *InliningPass = 0;
 393   if (DisableInline) {
 394     // No inlining pass
 395   } else if (OptLevel) {
 396     unsigned Threshold = 225;
 397     if (OptLevel > 2)
 398       Threshold = 275;
 399     InliningPass = createFunctionInliningPass(Threshold);
 400   } else {
 401     InliningPass = createAlwaysInlinerPass();
 402   }
 403   createStandardModulePasses(&MPM, OptLevel,
 404                              /*OptimizeSize=*/ false,
 405                              UnitAtATime,
 406                              /*UnrollLoops=*/ OptLevel > 1,
 407                              !DisableSimplifyLibCalls,
 408                              /*HaveExceptions=*/ true,
 409                              InliningPass);
 410 }
 411
 412 void AddStandardCompilePasses(PassManagerBase &PM) {
 413   PM.add(createVerifierPass());                  // Verify that input is correct
 414
 415   addPass(PM, createLowerSetJmpPass());          // Lower llvm.setjmp/.longjmp
 416
 417   // If the -strip-debug command line option was specified, do it.
 418   if (StripDebug)
 419     addPass(PM, createStripSymbolsPass(true));
 420
 421   if (DisableOptimizations) return;
 422
 423   llvm::Pass *InliningPass = !DisableInline ? createFunctionInliningPass() : 0;
 424
 425   // -std-compile-opts adds the same module passes as -O3.
 426   createStandardModulePasses(&PM, 3,
 427                              /*OptimizeSize=*/ false,
 428                              /*UnitAtATime=*/ true,
 429                              /*UnrollLoops=*/ true,
 430                              /*SimplifyLibCalls=*/ true,
 431                              /*HaveExceptions=*/ true,
 432                              InliningPass);
 433 }
 434
 435 void AddStandardLinkPasses(PassManagerBase &PM) {
 436   PM.add(createVerifierPass());                  // Verify that input is correct
 437
 438   // If the -strip-debug command line option was specified, do it.
 439   if (StripDebug)
 440     addPass(PM, createStripSymbolsPass(true));
 441
 442   if (DisableOptimizations) return;
 443
 444   createStandardLTOPasses(&PM, /*Internalize=*/ !DisableInternalize,
 445                           /*RunInliner=*/ !DisableInline,
 446                           /*VerifyEach=*/ VerifyEach);
 447 }
 448
 449 } // anonymous namespace
 450
 451
 452 //===----------------------------------------------------------------------===//
 453 // main for opt
 454 //
 455 int main(int argc, char **argv) {
 456   sys::PrintStackTraceOnErrorSignal();
 457   llvm::PrettyStackTraceProgram X(argc, argv);
 458
 459   // Enable debug stream buffering.
 460   EnableDebugBuffering = true;
 461
 462   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 463   LLVMContext &Context = getGlobalContext();
 464
 465   // Initialize passes
 466   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 467   initializeCore(Registry);
 468   initializeScalarOpts(Registry);
 469   initializeIPO(Registry);
 470   initializeAnalysis(Registry);
 471   initializeIPA(Registry);
 472   initializeTransformUtils(Registry);
 473   initializeInstCombine(Registry);
 474   initializeInstrumentation(Registry);
 475   initializeTarget(Registry);
 476
 477   cl::ParseCommandLineOptions(argc, argv,
 478     "llvm .bc -> .bc modular optimizer and analysis printer\n");
 479
 480   if (AnalyzeOnly && NoOutput) {
 481     errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
 482     return 1;
 483   }
 484
 485   // Allocate a full target machine description only if necessary.
 486   // FIXME: The choice of target should be controllable on the command line.
 487   std::auto_ptr<TargetMachine> target;
 488
 489   SMDiagnostic Err;
 490
 491   // Load the input module...
 492   std::auto_ptr<Module> M;
 493   M.reset(ParseIRFile(InputFilename, Err, Context));
 494
 495   if (M.get() == 0) {
 496     Err.Print(argv[0], errs());
 497     return 1;
 498   }
 499
 500   // Figure out what stream we are supposed to write to...
 501   OwningPtr<tool_output_file> Out;
 502   if (NoOutput) {
 503     if (!OutputFilename.empty())
 504       errs() << "WARNING: The -o (output filename) option is ignored when\n"
 505                 "the --disable-output option is used.\n";
 506   } else {
 507     // Default to standard output.
 508     if (OutputFilename.empty())
 509       OutputFilename = "-";
 510
 511     std::string ErrorInfo;
 512     Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 513                                    raw_fd_ostream::F_Binary));
 514     if (!ErrorInfo.empty()) {
 515       errs() << ErrorInfo << '\n';
 516       return 1;
 517     }
 518   }
 519
 520   // If the output is set to be emitted to standard out, and standard out is a
 521   // console, print out a warning message and refuse to do it.  We don't
 522   // impress anyone by spewing tons of binary goo to a terminal.
 523   if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
 524     if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
 525       NoOutput = true;
 526
 527   // Create a PassManager to hold and optimize the collection of passes we are
 528   // about to build...
 529   //
 530   PassManager Passes;
 531
 532   // Add an appropriate TargetData instance for this module...
 533   TargetData *TD = 0;
 534   const std::string &ModuleDataLayout = M.get()->getDataLayout();
 535   if (!ModuleDataLayout.empty())
 536     TD = new TargetData(ModuleDataLayout);
 537   else if (!DefaultDataLayout.empty())
 538     TD = new TargetData(DefaultDataLayout);
 539
 540   if (TD)
 541     Passes.add(TD);
 542
 543   OwningPtr<PassManager> FPasses;
 544   if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
 545     FPasses.reset(new PassManager());
 546     if (TD)
 547       FPasses->add(new TargetData(*TD));
 548   }
 549
 550   if (PrintBreakpoints) {
 551     // Default to standard output.
 552     if (!Out) {
 553       if (OutputFilename.empty())
 554         OutputFilename = "-";
 555
 556       std::string ErrorInfo;
 557       Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 558                                      raw_fd_ostream::F_Binary));
 559       if (!ErrorInfo.empty()) {
 560         errs() << ErrorInfo << '\n';
 561         return 1;
 562       }
 563     }
 564     Passes.add(new BreakpointPrinter(Out->os()));
 565     NoOutput = true;
 566   }
 567
 568   // If the -strip-debug command line option was specified, add it.  If
 569   // -std-compile-opts was also specified, it will handle StripDebug.
 570   if (StripDebug && !StandardCompileOpts)
 571     addPass(Passes, createStripSymbolsPass(true));
 572
 573   // Create a new optimization pass for each one specified on the command line
 574   for (unsigned i = 0; i < PassList.size(); ++i) {
 575     // Check to see if -std-compile-opts was specified before this option.  If
 576     // so, handle it.
 577     if (StandardCompileOpts &&
 578         StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
 579       AddStandardCompilePasses(Passes);
 580       StandardCompileOpts = false;
 581     }
 582
 583     if (StandardLinkOpts &&
 584         StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
 585       AddStandardLinkPasses(Passes);
 586       StandardLinkOpts = false;
 587     }
 588
 589     if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
 590       AddOptimizationPasses(Passes, *FPasses, 1);
 591       OptLevelO1 = false;
 592     }
 593
 594     if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
 595       AddOptimizationPasses(Passes, *FPasses, 2);
 596       OptLevelO2 = false;
 597     }
 598
 599     if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
 600       AddOptimizationPasses(Passes, *FPasses, 3);
 601       OptLevelO3 = false;
 602     }
 603
 604     const PassInfo *PassInf = PassList[i];
 605     Pass *P = 0;
 606     if (PassInf->getNormalCtor())
 607       P = PassInf->getNormalCtor()();
 608     else
 609       errs() << argv[0] << ": cannot create pass: "
 610              << PassInf->getPassName() << "\n";
 611     if (P) {
 612       PassKind Kind = P->getPassKind();
 613       addPass(Passes, P);
 614
 615       if (AnalyzeOnly) {
 616         switch (Kind) {
 617         case PT_BasicBlock:
 618           Passes.add(new BasicBlockPassPrinter(PassInf, Out->os()));
 619           break;
 620         case PT_Region:
 621           Passes.add(new RegionPassPrinter(PassInf, Out->os()));
 622           break;
 623         case PT_Loop:
 624           Passes.add(new LoopPassPrinter(PassInf, Out->os()));
 625           break;
 626         case PT_Function:
 627           Passes.add(new FunctionPassPrinter(PassInf, Out->os()));
 628           break;
 629         case PT_CallGraphSCC:
 630           Passes.add(new CallGraphSCCPassPrinter(PassInf, Out->os()));
 631           break;
 632         default:
 633           Passes.add(new ModulePassPrinter(PassInf, Out->os()));
 634           break;
 635         }
 636       }
 637     }
 638
 639     if (PrintEachXForm)
 640       Passes.add(createPrintModulePass(&errs()));
 641   }
 642
 643   // If -std-compile-opts was specified at the end of the pass list, add them.
 644   if (StandardCompileOpts) {
 645     AddStandardCompilePasses(Passes);
 646     StandardCompileOpts = false;
 647   }
 648
 649   if (StandardLinkOpts) {
 650     AddStandardLinkPasses(Passes);
 651     StandardLinkOpts = false;
 652   }
 653
 654   if (OptLevelO1)
 655     AddOptimizationPasses(Passes, *FPasses, 1);
 656
 657   if (OptLevelO2)
 658     AddOptimizationPasses(Passes, *FPasses, 2);
 659
 660   if (OptLevelO3)
 661     AddOptimizationPasses(Passes, *FPasses, 3);
 662
 663   if (OptLevelO1 || OptLevelO2 || OptLevelO3)
 664     FPasses->run(*M.get());
 665
 666   // Check that the module is well formed on completion of optimization
 667   if (!NoVerify && !VerifyEach)
 668     Passes.add(createVerifierPass());
 669
 670   // Write bitcode or assembly to the output as the last step...
 671   if (!NoOutput && !AnalyzeOnly) {
 672     if (OutputAssembly)
 673       Passes.add(createPrintModulePass(&Out->os()));
 674     else
 675       Passes.add(createBitcodeWriterPass(Out->os()));
 676   }
 677
 678   // Now that we have all of the passes ready, run them.
 679   Passes.run(*M.get());
 680
 681   // Declare success.
 682   if (!NoOutput || PrintBreakpoints)
 683     Out->keep();
 684
 685   return 0;
 686 }