src/llvm/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/DebugInfo.h"
  17 #include "llvm/Module.h"
  18 #include "llvm/PassManager.h"
  19 #include "llvm/CallGraphSCCPass.h"
  20 #include "llvm/Bitcode/ReaderWriter.h"
  21 #include "llvm/Assembly/PrintModulePass.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/SystemUtils.h"
  39 #include "llvm/Support/ToolOutputFile.h"
  40 #include "llvm/LinkAllPasses.h"
  41 #include "llvm/LinkAllVMCore.h"
  42 #include "llvm/Transforms/IPO/PassManagerBuilder.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 clang -O1"));
 108
 109 static cl::opt<bool>
 110 OptLevelO2("O2",
 111            cl::desc("Optimization level 2. Similar to clang -O2"));
 112
 113 static cl::opt<bool>
 114 OptLevelOs("Os",
 115            cl::desc("Like -O2 with extra optimizations for size. Similar to clang -Os"));
 116
 117 static cl::opt<bool>
 118 OptLevelOz("Oz",
 119            cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
 120
 121 static cl::opt<bool>
 122 OptLevelO3("O3",
 123            cl::desc("Optimization level 3. Similar to clang -O3"));
 124
 125 static cl::opt<std::string>
 126 TargetTriple("mtriple", cl::desc("Override target triple for module"));
 127
 128 static cl::opt<bool>
 129 UnitAtATime("funit-at-a-time",
 130             cl::desc("Enable IPO. This is same as llvm-gcc's -funit-at-a-time"),
 131             cl::init(true));
 132
 133 static cl::opt<bool>
 134 DisableSimplifyLibCalls("disable-simplify-libcalls",
 135                         cl::desc("Disable simplify-libcalls"));
 136
 137 static cl::opt<bool>
 138 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
 139
 140 static cl::alias
 141 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
 142
 143 static cl::opt<bool>
 144 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
 145
 146 static cl::opt<bool>
 147 PrintBreakpoints("print-breakpoints-for-testing",
 148                  cl::desc("Print select breakpoints location for testing"));
 149
 150 static cl::opt<std::string>
 151 DefaultDataLayout("default-data-layout",
 152           cl::desc("data layout string to use if not specified by module"),
 153           cl::value_desc("layout-string"), cl::init(""));
 154
 155 // ---------- Define Printers for module and function passes ------------
 156 namespace {
 157
 158 struct CallGraphSCCPassPrinter : public CallGraphSCCPass {
 159   static char ID;
 160   const PassInfo *PassToPrint;
 161   raw_ostream &Out;
 162   std::string PassName;
 163
 164   CallGraphSCCPassPrinter(const PassInfo *PI, raw_ostream &out) :
 165     CallGraphSCCPass(ID), PassToPrint(PI), Out(out) {
 166       std::string PassToPrintName =  PassToPrint->getPassName();
 167       PassName = "CallGraphSCCPass Printer: " + PassToPrintName;
 168     }
 169
 170   virtual bool runOnSCC(CallGraphSCC &SCC) {
 171     if (!Quiet)
 172       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 173
 174     // Get and print pass...
 175     for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
 176       Function *F = (*I)->getFunction();
 177       if (F)
 178         getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 179                                                               F->getParent());
 180     }
 181     return false;
 182   }
 183
 184   virtual const char *getPassName() const { return PassName.c_str(); }
 185
 186   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 187     AU.addRequiredID(PassToPrint->getTypeInfo());
 188     AU.setPreservesAll();
 189   }
 190 };
 191
 192 char CallGraphSCCPassPrinter::ID = 0;
 193
 194 struct ModulePassPrinter : public ModulePass {
 195   static char ID;
 196   const PassInfo *PassToPrint;
 197   raw_ostream &Out;
 198   std::string PassName;
 199
 200   ModulePassPrinter(const PassInfo *PI, raw_ostream &out)
 201     : ModulePass(ID), PassToPrint(PI), Out(out) {
 202       std::string PassToPrintName =  PassToPrint->getPassName();
 203       PassName = "ModulePass Printer: " + PassToPrintName;
 204     }
 205
 206   virtual bool runOnModule(Module &M) {
 207     if (!Quiet)
 208       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 209
 210     // Get and print pass...
 211     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out, &M);
 212     return false;
 213   }
 214
 215   virtual const char *getPassName() const { return PassName.c_str(); }
 216
 217   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 218     AU.addRequiredID(PassToPrint->getTypeInfo());
 219     AU.setPreservesAll();
 220   }
 221 };
 222
 223 char ModulePassPrinter::ID = 0;
 224 struct FunctionPassPrinter : public FunctionPass {
 225   const PassInfo *PassToPrint;
 226   raw_ostream &Out;
 227   static char ID;
 228   std::string PassName;
 229
 230   FunctionPassPrinter(const PassInfo *PI, raw_ostream &out)
 231     : FunctionPass(ID), PassToPrint(PI), Out(out) {
 232       std::string PassToPrintName =  PassToPrint->getPassName();
 233       PassName = "FunctionPass Printer: " + PassToPrintName;
 234     }
 235
 236   virtual bool runOnFunction(Function &F) {
 237     if (!Quiet)
 238       Out << "Printing analysis '" << PassToPrint->getPassName()
 239           << "' for function '" << F.getName() << "':\n";
 240
 241     // Get and print pass...
 242     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 243             F.getParent());
 244     return false;
 245   }
 246
 247   virtual const char *getPassName() const { return PassName.c_str(); }
 248
 249   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 250     AU.addRequiredID(PassToPrint->getTypeInfo());
 251     AU.setPreservesAll();
 252   }
 253 };
 254
 255 char FunctionPassPrinter::ID = 0;
 256
 257 struct LoopPassPrinter : public LoopPass {
 258   static char ID;
 259   const PassInfo *PassToPrint;
 260   raw_ostream &Out;
 261   std::string PassName;
 262
 263   LoopPassPrinter(const PassInfo *PI, raw_ostream &out) :
 264     LoopPass(ID), PassToPrint(PI), Out(out) {
 265       std::string PassToPrintName =  PassToPrint->getPassName();
 266       PassName = "LoopPass Printer: " + PassToPrintName;
 267     }
 268
 269
 270   virtual bool runOnLoop(Loop *L, LPPassManager &LPM) {
 271     if (!Quiet)
 272       Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
 273
 274     // Get and print pass...
 275     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 276                         L->getHeader()->getParent()->getParent());
 277     return false;
 278   }
 279
 280   virtual const char *getPassName() const { return PassName.c_str(); }
 281
 282   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 283     AU.addRequiredID(PassToPrint->getTypeInfo());
 284     AU.setPreservesAll();
 285   }
 286 };
 287
 288 char LoopPassPrinter::ID = 0;
 289
 290 struct RegionPassPrinter : public RegionPass {
 291   static char ID;
 292   const PassInfo *PassToPrint;
 293   raw_ostream &Out;
 294   std::string PassName;
 295
 296   RegionPassPrinter(const PassInfo *PI, raw_ostream &out) : RegionPass(ID),
 297     PassToPrint(PI), Out(out) {
 298     std::string PassToPrintName =  PassToPrint->getPassName();
 299     PassName = "RegionPass Printer: " + PassToPrintName;
 300   }
 301
 302   virtual bool runOnRegion(Region *R, RGPassManager &RGM) {
 303     if (!Quiet) {
 304       Out << "Printing analysis '" << PassToPrint->getPassName() << "' for "
 305           << "region: '" << R->getNameStr() << "' in function '"
 306           << R->getEntry()->getParent()->getName() << "':\n";
 307     }
 308     // Get and print pass...
 309    getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 310                        R->getEntry()->getParent()->getParent());
 311     return false;
 312   }
 313
 314   virtual const char *getPassName() const { return PassName.c_str(); }
 315
 316   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 317     AU.addRequiredID(PassToPrint->getTypeInfo());
 318     AU.setPreservesAll();
 319   }
 320 };
 321
 322 char RegionPassPrinter::ID = 0;
 323
 324 struct BasicBlockPassPrinter : public BasicBlockPass {
 325   const PassInfo *PassToPrint;
 326   raw_ostream &Out;
 327   static char ID;
 328   std::string PassName;
 329
 330   BasicBlockPassPrinter(const PassInfo *PI, raw_ostream &out)
 331     : BasicBlockPass(ID), PassToPrint(PI), Out(out) {
 332       std::string PassToPrintName =  PassToPrint->getPassName();
 333       PassName = "BasicBlockPass Printer: " + PassToPrintName;
 334     }
 335
 336   virtual bool runOnBasicBlock(BasicBlock &BB) {
 337     if (!Quiet)
 338       Out << "Printing Analysis info for BasicBlock '" << BB.getName()
 339           << "': Pass " << PassToPrint->getPassName() << ":\n";
 340
 341     // Get and print pass...
 342     getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
 343             BB.getParent()->getParent());
 344     return false;
 345   }
 346
 347   virtual const char *getPassName() const { return PassName.c_str(); }
 348
 349   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 350     AU.addRequiredID(PassToPrint->getTypeInfo());
 351     AU.setPreservesAll();
 352   }
 353 };
 354
 355 char BasicBlockPassPrinter::ID = 0;
 356
 357 struct BreakpointPrinter : public ModulePass {
 358   raw_ostream &Out;
 359   static char ID;
 360
 361   BreakpointPrinter(raw_ostream &out)
 362     : ModulePass(ID), Out(out) {
 363     }
 364
 365   void getContextName(DIDescriptor Context, std::string &N) {
 366     if (Context.isNameSpace()) {
 367       DINameSpace NS(Context);
 368       if (!NS.getName().empty()) {
 369         getContextName(NS.getContext(), N);
 370         N = N + NS.getName().str() + "::";
 371       }
 372     } else if (Context.isType()) {
 373       DIType TY(Context);
 374       if (!TY.getName().empty()) {
 375         getContextName(TY.getContext(), N);
 376         N = N + TY.getName().str() + "::";
 377       }
 378     }
 379   }
 380
 381   virtual bool runOnModule(Module &M) {
 382     StringSet<> Processed;
 383     if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp"))
 384       for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
 385         std::string Name;
 386         DISubprogram SP(NMD->getOperand(i));
 387         if (SP.Verify())
 388           getContextName(SP.getContext(), Name);
 389         Name = Name + SP.getDisplayName().str();
 390         if (!Name.empty() && Processed.insert(Name)) {
 391           Out << Name << "\n";
 392         }
 393       }
 394     return false;
 395   }
 396
 397   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
 398     AU.setPreservesAll();
 399   }
 400 };
 401
 402 } // anonymous namespace
 403
 404 char BreakpointPrinter::ID = 0;
 405
 406 static inline void addPass(PassManagerBase &PM, Pass *P) {
 407   // Add the pass to the pass manager...
 408   PM.add(P);
 409
 410   // If we are verifying all of the intermediate steps, add the verifier...
 411   if (VerifyEach) PM.add(createVerifierPass());
 412 }
 413
 414 /// AddOptimizationPasses - This routine adds optimization passes
 415 /// based on selected optimization level, OptLevel. This routine
 416 /// duplicates llvm-gcc behaviour.
 417 ///
 418 /// OptLevel - Optimization Level
 419 static void AddOptimizationPasses(PassManagerBase &MPM,FunctionPassManager &FPM,
 420                                   unsigned OptLevel, unsigned SizeLevel) {
 421   FPM.add(createVerifierPass());                  // Verify that input is correct
 422
 423   PassManagerBuilder Builder;
 424   Builder.OptLevel = OptLevel;
 425   Builder.SizeLevel = SizeLevel;
 426
 427   if (DisableInline) {
 428     // No inlining pass
 429   } else if (OptLevel > 1) {
 430     unsigned Threshold = 225;
 431     if (SizeLevel == 1)      // -Os
 432       Threshold = 75;
 433     else if (SizeLevel == 2) // -Oz
 434       Threshold = 25;
 435     if (OptLevel > 2)
 436       Threshold = 275;
 437     Builder.Inliner = createFunctionInliningPass(Threshold);
 438   } else {
 439     Builder.Inliner = createAlwaysInlinerPass();
 440   }
 441   Builder.DisableUnitAtATime = !UnitAtATime;
 442   Builder.DisableUnrollLoops = OptLevel == 0;
 443   Builder.DisableSimplifyLibCalls = DisableSimplifyLibCalls;
 444
 445   Builder.populateFunctionPassManager(FPM);
 446   Builder.populateModulePassManager(MPM);
 447 }
 448
 449 static void AddStandardCompilePasses(PassManagerBase &PM) {
 450   PM.add(createVerifierPass());                  // Verify that input is correct
 451
 452   // If the -strip-debug command line option was specified, do it.
 453   if (StripDebug)
 454     addPass(PM, createStripSymbolsPass(true));
 455
 456   if (DisableOptimizations) return;
 457
 458   // -std-compile-opts adds the same module passes as -O3.
 459   PassManagerBuilder Builder;
 460   if (!DisableInline)
 461     Builder.Inliner = createFunctionInliningPass();
 462   Builder.OptLevel = 3;
 463   Builder.DisableSimplifyLibCalls = DisableSimplifyLibCalls;
 464   Builder.populateModulePassManager(PM);
 465 }
 466
 467 static void AddStandardLinkPasses(PassManagerBase &PM) {
 468   PM.add(createVerifierPass());                  // Verify that input is correct
 469
 470   // If the -strip-debug command line option was specified, do it.
 471   if (StripDebug)
 472     addPass(PM, createStripSymbolsPass(true));
 473
 474   if (DisableOptimizations) return;
 475
 476   PassManagerBuilder Builder;
 477   Builder.populateLTOPassManager(PM, /*Internalize=*/ !DisableInternalize,
 478                                  /*RunInliner=*/ !DisableInline);
 479 }
 480
 481
 482 //===----------------------------------------------------------------------===//
 483 // main for opt
 484 //
 485 int main(int argc, char **argv) {
 486   sys::PrintStackTraceOnErrorSignal();
 487   llvm::PrettyStackTraceProgram X(argc, argv);
 488
 489   // Enable debug stream buffering.
 490   EnableDebugBuffering = true;
 491
 492   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 493   LLVMContext &Context = getGlobalContext();
 494
 495   // Initialize passes
 496   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 497   initializeCore(Registry);
 498   initializeScalarOpts(Registry);
 499   initializeVectorization(Registry);
 500   initializeIPO(Registry);
 501   initializeAnalysis(Registry);
 502   initializeIPA(Registry);
 503   initializeTransformUtils(Registry);
 504   initializeInstCombine(Registry);
 505   initializeInstrumentation(Registry);
 506   initializeTarget(Registry);
 507
 508   cl::ParseCommandLineOptions(argc, argv,
 509     "llvm .bc -> .bc modular optimizer and analysis printer\n");
 510
 511   if (AnalyzeOnly && NoOutput) {
 512     errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
 513     return 1;
 514   }
 515
 516   SMDiagnostic Err;
 517
 518   // Load the input module...
 519   std::auto_ptr<Module> M;
 520   M.reset(ParseIRFile(InputFilename, Err, Context));
 521
 522   if (M.get() == 0) {
 523     Err.print(argv[0], errs());
 524     return 1;
 525   }
 526
 527   // If we are supposed to override the target triple, do so now.
 528   if (!TargetTriple.empty())
 529     M->setTargetTriple(Triple::normalize(TargetTriple));
 530
 531   // Figure out what stream we are supposed to write to...
 532   OwningPtr<tool_output_file> Out;
 533   if (NoOutput) {
 534     if (!OutputFilename.empty())
 535       errs() << "WARNING: The -o (output filename) option is ignored when\n"
 536                 "the --disable-output option is used.\n";
 537   } else {
 538     // Default to standard output.
 539     if (OutputFilename.empty())
 540       OutputFilename = "-";
 541
 542     std::string ErrorInfo;
 543     Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 544                                    raw_fd_ostream::F_Binary));
 545     if (!ErrorInfo.empty()) {
 546       errs() << ErrorInfo << '\n';
 547       return 1;
 548     }
 549   }
 550
 551   // If the output is set to be emitted to standard out, and standard out is a
 552   // console, print out a warning message and refuse to do it.  We don't
 553   // impress anyone by spewing tons of binary goo to a terminal.
 554   if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
 555     if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
 556       NoOutput = true;
 557
 558   // Create a PassManager to hold and optimize the collection of passes we are
 559   // about to build.
 560   //
 561   PassManager Passes;
 562
 563   // Add an appropriate TargetLibraryInfo pass for the module's triple.
 564   TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));
 565
 566   // The -disable-simplify-libcalls flag actually disables all builtin optzns.
 567   if (DisableSimplifyLibCalls)
 568     TLI->disableAllFunctions();
 569   Passes.add(TLI);
 570
 571   // Add an appropriate TargetData instance for this module.
 572   TargetData *TD = 0;
 573   const std::string &ModuleDataLayout = M.get()->getDataLayout();
 574   if (!ModuleDataLayout.empty())
 575     TD = new TargetData(ModuleDataLayout);
 576   else if (!DefaultDataLayout.empty())
 577     TD = new TargetData(DefaultDataLayout);
 578
 579   if (TD)
 580     Passes.add(TD);
 581
 582   OwningPtr<FunctionPassManager> FPasses;
 583   if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
 584     FPasses.reset(new FunctionPassManager(M.get()));
 585     if (TD)
 586       FPasses->add(new TargetData(*TD));
 587   }
 588
 589   if (PrintBreakpoints) {
 590     // Default to standard output.
 591     if (!Out) {
 592       if (OutputFilename.empty())
 593         OutputFilename = "-";
 594
 595       std::string ErrorInfo;
 596       Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
 597                                      raw_fd_ostream::F_Binary));
 598       if (!ErrorInfo.empty()) {
 599         errs() << ErrorInfo << '\n';
 600         return 1;
 601       }
 602     }
 603     Passes.add(new BreakpointPrinter(Out->os()));
 604     NoOutput = true;
 605   }
 606
 607   // If the -strip-debug command line option was specified, add it.  If
 608   // -std-compile-opts was also specified, it will handle StripDebug.
 609   if (StripDebug && !StandardCompileOpts)
 610     addPass(Passes, createStripSymbolsPass(true));
 611
 612   // Create a new optimization pass for each one specified on the command line
 613   for (unsigned i = 0; i < PassList.size(); ++i) {
 614     // Check to see if -std-compile-opts was specified before this option.  If
 615     // so, handle it.
 616     if (StandardCompileOpts &&
 617         StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
 618       AddStandardCompilePasses(Passes);
 619       StandardCompileOpts = false;
 620     }
 621
 622     if (StandardLinkOpts &&
 623         StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
 624       AddStandardLinkPasses(Passes);
 625       StandardLinkOpts = false;
 626     }
 627
 628     if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
 629       AddOptimizationPasses(Passes, *FPasses, 1, 0);
 630       OptLevelO1 = false;
 631     }
 632
 633     if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
 634       AddOptimizationPasses(Passes, *FPasses, 2, 0);
 635       OptLevelO2 = false;
 636     }
 637
 638     if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
 639       AddOptimizationPasses(Passes, *FPasses, 2, 1);
 640       OptLevelOs = false;
 641     }
 642
 643     if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
 644       AddOptimizationPasses(Passes, *FPasses, 2, 2);
 645       OptLevelOz = false;
 646     }
 647
 648     if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
 649       AddOptimizationPasses(Passes, *FPasses, 3, 0);
 650       OptLevelO3 = false;
 651     }
 652
 653     const PassInfo *PassInf = PassList[i];
 654     Pass *P = 0;
 655     if (PassInf->getNormalCtor())
 656       P = PassInf->getNormalCtor()();
 657     else
 658       errs() << argv[0] << ": cannot create pass: "
 659              << PassInf->getPassName() << "\n";
 660     if (P) {
 661       PassKind Kind = P->getPassKind();
 662       addPass(Passes, P);
 663
 664       if (AnalyzeOnly) {
 665         switch (Kind) {
 666         case PT_BasicBlock:
 667           Passes.add(new BasicBlockPassPrinter(PassInf, Out->os()));
 668           break;
 669         case PT_Region:
 670           Passes.add(new RegionPassPrinter(PassInf, Out->os()));
 671           break;
 672         case PT_Loop:
 673           Passes.add(new LoopPassPrinter(PassInf, Out->os()));
 674           break;
 675         case PT_Function:
 676           Passes.add(new FunctionPassPrinter(PassInf, Out->os()));
 677           break;
 678         case PT_CallGraphSCC:
 679           Passes.add(new CallGraphSCCPassPrinter(PassInf, Out->os()));
 680           break;
 681         default:
 682           Passes.add(new ModulePassPrinter(PassInf, Out->os()));
 683           break;
 684         }
 685       }
 686     }
 687
 688     if (PrintEachXForm)
 689       Passes.add(createPrintModulePass(&errs()));
 690   }
 691
 692   // If -std-compile-opts was specified at the end of the pass list, add them.
 693   if (StandardCompileOpts) {
 694     AddStandardCompilePasses(Passes);
 695     StandardCompileOpts = false;
 696   }
 697
 698   if (StandardLinkOpts) {
 699     AddStandardLinkPasses(Passes);
 700     StandardLinkOpts = false;
 701   }
 702
 703   if (OptLevelO1)
 704     AddOptimizationPasses(Passes, *FPasses, 1, 0);
 705
 706   if (OptLevelO2)
 707     AddOptimizationPasses(Passes, *FPasses, 2, 0);
 708
 709   if (OptLevelOs)
 710     AddOptimizationPasses(Passes, *FPasses, 2, 1);
 711
 712   if (OptLevelOz)
 713     AddOptimizationPasses(Passes, *FPasses, 2, 2);
 714
 715   if (OptLevelO3)
 716     AddOptimizationPasses(Passes, *FPasses, 3, 0);
 717
 718   if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
 719     FPasses->doInitialization();
 720     for (Module::iterator F = M->begin(), E = M->end(); F != E; ++F)
 721       FPasses->run(*F);
 722     FPasses->doFinalization();
 723   }
 724
 725   // Check that the module is well formed on completion of optimization
 726   if (!NoVerify && !VerifyEach)
 727     Passes.add(createVerifierPass());
 728
 729   // Write bitcode or assembly to the output as the last step...
 730   if (!NoOutput && !AnalyzeOnly) {
 731     if (OutputAssembly)
 732       Passes.add(createPrintModulePass(&Out->os()));
 733     else
 734       Passes.add(createBitcodeWriterPass(Out->os()));
 735   }
 736
 737   // Before executing passes, print the final values of the LLVM options.
 738   cl::PrintOptionValues();
 739
 740   // Now that we have all of the passes ready, run them.
 741   Passes.run(*M.get());
 742
 743   // Declare success.
 744   if (!NoOutput || PrintBreakpoints)
 745     Out->keep();
 746
 747   return 0;
 748 }