tools/llvmc/CompilerDriver.cpp

   1 //===- CompilerDriver.cpp - The LLVM Compiler Driver ------------*- C++ -*-===//
   2 //
   3 //
   4 //                     The LLVM Compiler Infrastructure
   5 //
   6 // This file was developed by Reid Spencer and is distributed under the
   7 // University of Illinois Open Source License. See LICENSE.TXT for details.
   8 //
   9 //===----------------------------------------------------------------------===//
  10 //
  11 // This file implements the bulk of the LLVM Compiler Driver (llvmc).
  12 //
  13 //===------------------------------------------------------------------------===
  14
  15 #include "CompilerDriver.h"
  16 #include "ConfigLexer.h"
  17 #include "llvm/Module.h"
  18 #include "llvm/Bytecode/Reader.h"
  19 #include "llvm/System/Signals.h"
  20 #include "llvm/Support/FileUtilities.h"
  21 #include "llvm/ADT/SetVector.h"
  22 #include "llvm/ADT/StringExtras.h"
  23 #include <iostream>
  24
  25 using namespace llvm;
  26
  27 namespace {
  28
  29   void WriteAction(CompilerDriver::Action* action ) {
  30     std::cerr << action->program.c_str();
  31     std::vector<std::string>::iterator I = action->args.begin();
  32     while (I != action->args.end()) {
  33       std::cerr << " " + *I;
  34       ++I;
  35     }
  36     std::cerr << "\n";
  37   }
  38
  39   void DumpAction(CompilerDriver::Action* action) {
  40     std::cerr << "command = " << action->program.c_str();
  41     std::vector<std::string>::iterator I = action->args.begin();
  42     while (I != action->args.end()) {
  43       std::cerr << " " + *I;
  44       ++I;
  45     }
  46     std::cerr << "\n";
  47     std::cerr << "flags = " << action->flags << "\n";
  48   }
  49
  50   void DumpConfigData(CompilerDriver::ConfigData* cd, const std::string& type ){
  51     std::cerr << "Configuration Data For '" << cd->langName << "' (" << type
  52       << ")\n";
  53     std::cerr << "PreProcessor: ";
  54     DumpAction(&cd->PreProcessor);
  55     std::cerr << "Translator: ";
  56     DumpAction(&cd->Translator);
  57     std::cerr << "Optimizer: ";
  58     DumpAction(&cd->Optimizer);
  59     std::cerr << "Assembler: ";
  60     DumpAction(&cd->Assembler);
  61     std::cerr << "Linker: ";
  62     DumpAction(&cd->Linker);
  63   }
  64
  65   /// This specifies the passes to run for OPT_FAST_COMPILE (-O1)
  66   /// which should reduce the volume of code and make compilation
  67   /// faster. This is also safe on any llvm module.
  68   static const char* DefaultFastCompileOptimizations[] = {
  69     "-simplifycfg", "-mem2reg", "-instcombine"
  70   };
  71
  72   class CompilerDriverImpl : public CompilerDriver {
  73     /// @name Constructors
  74     /// @{
  75     public:
  76       CompilerDriverImpl(ConfigDataProvider& confDatProv )
  77         : cdp(&confDatProv)
  78         , finalPhase(LINKING)
  79         , optLevel(OPT_FAST_COMPILE)
  80         , Flags(0)
  81         , machine()
  82         , LibraryPaths()
  83         , TempDir()
  84         , AdditionalArgs()
  85       {
  86         TempDir = sys::Path::GetTemporaryDirectory();
  87         sys::RemoveDirectoryOnSignal(TempDir);
  88         AdditionalArgs.reserve(NUM_PHASES);
  89         StringVector emptyVec;
  90         for (unsigned i = 0; i < NUM_PHASES; ++i)
  91           AdditionalArgs.push_back(emptyVec);
  92       }
  93
  94       virtual ~CompilerDriverImpl() {
  95         cleanup();
  96         cdp = 0;
  97         LibraryPaths.clear();
  98         AdditionalArgs.clear();
  99       }
 100
 101     /// @}
 102     /// @name Methods
 103     /// @{
 104     public:
 105       virtual void setFinalPhase( Phases phase ) {
 106         finalPhase = phase;
 107       }
 108
 109       virtual void setOptimization( OptimizationLevels level ) {
 110         optLevel = level;
 111       }
 112
 113       virtual void setDriverFlags( unsigned flags ) {
 114         Flags = flags & DRIVER_FLAGS_MASK;
 115       }
 116
 117       virtual void setOutputMachine( const std::string& machineName ) {
 118         machine = machineName;
 119       }
 120
 121       virtual void setPhaseArgs(Phases phase, const StringVector& opts) {
 122         assert(phase <= LINKING && phase >= PREPROCESSING);
 123         AdditionalArgs[phase] = opts;
 124       }
 125
 126       virtual void setIncludePaths(const StringVector& paths) {
 127         StringVector::const_iterator I = paths.begin();
 128         StringVector::const_iterator E = paths.end();
 129         while (I != E) {
 130           sys::Path tmp;
 131           tmp.set_directory(*I);
 132           IncludePaths.push_back(tmp);
 133           ++I;
 134         }
 135       }
 136
 137       virtual void setSymbolDefines(const StringVector& defs) {
 138         Defines = defs;
 139       }
 140
 141       virtual void setLibraryPaths(const StringVector& paths) {
 142         StringVector::const_iterator I = paths.begin();
 143         StringVector::const_iterator E = paths.end();
 144         while (I != E) {
 145           sys::Path tmp;
 146           tmp.set_directory(*I);
 147           LibraryPaths.push_back(tmp);
 148           ++I;
 149         }
 150       }
 151
 152       virtual void addLibraryPath( const sys::Path& libPath ) {
 153         LibraryPaths.push_back(libPath);
 154       }
 155
 156     /// @}
 157     /// @name Functions
 158     /// @{
 159     private:
 160       bool isSet(DriverFlags flag) {
 161         return 0 != ((flag & DRIVER_FLAGS_MASK) & Flags);
 162       }
 163
 164       void cleanup() {
 165         if (!isSet(KEEP_TEMPS_FLAG)) {
 166           if (TempDir.is_directory() && TempDir.writable())
 167             TempDir.destroy_directory(/*remove_contents=*/true);
 168         } else {
 169           std::cout << "Temporary files are in " << TempDir.get() << "\n";
 170         }
 171       }
 172
 173       sys::Path MakeTempFile(const std::string& basename, const std::string& suffix ) {
 174         sys::Path result(TempDir);
 175         if (!result.append_file(basename))
 176           throw basename + ": can't use this file name";
 177         if (!result.append_suffix(suffix))
 178           throw suffix + ": can't use this file suffix";
 179         return result;
 180       }
 181
 182       Action* GetAction(ConfigData* cd,
 183                         const sys::Path& input,
 184                         const sys::Path& output,
 185                         Phases phase)
 186       {
 187         Action* pat = 0; ///< The pattern/template for the action
 188         Action* action = new Action; ///< The actual action to execute
 189
 190         // Get the action pattern
 191         switch (phase) {
 192           case PREPROCESSING: pat = &cd->PreProcessor; break;
 193           case TRANSLATION:   pat = &cd->Translator; break;
 194           case OPTIMIZATION:  pat = &cd->Optimizer; break;
 195           case ASSEMBLY:      pat = &cd->Assembler; break;
 196           case LINKING:       pat = &cd->Linker; break;
 197           default:
 198             assert(!"Invalid driver phase!");
 199             break;
 200         }
 201         assert(pat != 0 && "Invalid command pattern");
 202
 203         // Copy over some pattern things that don't need to change
 204         action->program = pat->program;
 205         action->flags = pat->flags;
 206
 207         // Do the substitutions from the pattern to the actual
 208         StringVector::iterator PI = pat->args.begin();
 209         StringVector::iterator PE = pat->args.end();
 210         while (PI != PE) {
 211           if ((*PI)[0] == '%' && PI->length() >2) {
 212             bool found = true;
 213             switch ((*PI)[1]) {
 214               case 'a':
 215                 if (*PI == "%args%") {
 216                   if (AdditionalArgs.size() > unsigned(phase))
 217                     if (!AdditionalArgs[phase].empty()) {
 218                       // Get specific options for each kind of action type
 219                       StringVector& addargs = AdditionalArgs[phase];
 220                       // Add specific options for each kind of action type
 221                       action->args.insert(action->args.end(), addargs.begin(), addargs.end());
 222                     }
 223                 } else
 224                   found = false;
 225                 break;
 226               case 'd':
 227                 if (*PI == "%defs%") {
 228                   StringVector::iterator I = Defines.begin();
 229                   StringVector::iterator E = Defines.end();
 230                   while (I != E) {
 231                     action->args.push_back( std::string("-D") + *I);
 232                     ++I;
 233                   }
 234                 } else
 235                   found = false;
 236                 break;
 237               case 'f':
 238                 if (*PI == "%force%") {
 239                   if (isSet(FORCE_FLAG))
 240                     action->args.push_back("-f");
 241                 } else
 242                   found = false;
 243                 break;
 244               case 'i':
 245                 if (*PI == "%in%") {
 246                   action->args.push_back(input.get());
 247                 } else if (*PI == "%incls%") {
 248                   PathVector::iterator I = IncludePaths.begin();
 249                   PathVector::iterator E = IncludePaths.end();
 250                   while (I != E) {
 251                     action->args.push_back( std::string("-I") + I->get() );
 252                     ++I;
 253                   }
 254                 } else
 255                   found = false;
 256                 break;
 257               case 'l':
 258                 if (*PI == "%libs%") {
 259                   PathVector::iterator I = LibraryPaths.begin();
 260                   PathVector::iterator E = LibraryPaths.end();
 261                   while (I != E) {
 262                     action->args.push_back( std::string("-L") + I->get() );
 263                     ++I;
 264                   }
 265                 } else
 266                   found = false;
 267                 break;
 268               case 'o':
 269                 if (*PI == "%out%") {
 270                   action->args.push_back(output.get());
 271                 } else if (*PI == "%opt%") {
 272                   if (!isSet(EMIT_RAW_FLAG)) {
 273                     if (cd->opts.size() > static_cast<unsigned>(optLevel) &&
 274                         !cd->opts[optLevel].empty())
 275                       action->args.insert(action->args.end(), cd->opts[optLevel].begin(),
 276                           cd->opts[optLevel].end());
 277                     else
 278                       throw std::string("Optimization options for level ") +
 279                             utostr(unsigned(optLevel)) + " were not specified";
 280                   }
 281                 } else
 282                   found = false;
 283                 break;
 284               case 's':
 285                 if (*PI == "%stats%") {
 286                   if (isSet(SHOW_STATS_FLAG))
 287                     action->args.push_back("-stats");
 288                 } else
 289                   found = false;
 290                 break;
 291               case 't':
 292                 if (*PI == "%target%") {
 293                   action->args.push_back(std::string("-march=") + machine);
 294                 } else if (*PI == "%time%") {
 295                   if (isSet(TIME_PASSES_FLAG))
 296                     action->args.push_back("-time-passes");
 297                 } else
 298                   found = false;
 299                 break;
 300               case 'v':
 301                 if (*PI == "%verbose%") {
 302                   if (isSet(VERBOSE_FLAG))
 303                     action->args.push_back("-v");
 304                 } else
 305                   found  = false;
 306                 break;
 307               default:
 308                 found = false;
 309                 break;
 310             }
 311             if (!found) {
 312               // Did it even look like a substitution?
 313               if (PI->length()>1 && (*PI)[0] == '%' &&
 314                   (*PI)[PI->length()-1] == '%') {
 315                 throw std::string("Invalid substitution token: '") + *PI +
 316                       "' for command '" + pat->program.get() + "'";
 317               } else {
 318                 // It's not a legal substitution, just pass it through
 319                 action->args.push_back(*PI);
 320               }
 321             }
 322           } else {
 323             // Its not a substitution, just put it in the action
 324             action->args.push_back(*PI);
 325           }
 326           PI++;
 327         }
 328
 329         // Finally, we're done
 330         return action;
 331       }
 332
 333       bool DoAction(Action*action) {
 334         assert(action != 0 && "Invalid Action!");
 335         if (isSet(VERBOSE_FLAG))
 336           WriteAction(action);
 337         if (!isSet(DRY_RUN_FLAG)) {
 338           action->program = sys::Program::FindProgramByName(action->program.get());
 339           if (action->program.is_empty())
 340             throw std::string("Can't find program '") + action->program.get() + "'";
 341
 342           // Invoke the program
 343           return 0 == action->program.ExecuteAndWait(action->args);
 344         }
 345         return true;
 346       }
 347
 348       /// This method tries various variants of a linkage item's file
 349       /// name to see if it can find an appropriate file to link with
 350       /// in the directory specified.
 351       llvm::sys::Path GetPathForLinkageItem(const std::string& link_item,
 352                                             const sys::Path& dir) {
 353         sys::Path fullpath(dir);
 354         fullpath.append_file(link_item);
 355         fullpath.append_suffix("bc");
 356         if (fullpath.readable())
 357           return fullpath;
 358         fullpath.elide_suffix();
 359         fullpath.append_suffix("o");
 360         if (fullpath.readable())
 361           return fullpath;
 362         fullpath = dir;
 363         fullpath.append_file(std::string("lib") + link_item);
 364         fullpath.append_suffix("a");
 365         if (fullpath.readable())
 366           return fullpath;
 367         fullpath.elide_suffix();
 368         fullpath.append_suffix("so");
 369         if (fullpath.readable())
 370           return fullpath;
 371
 372         // Didn't find one.
 373         fullpath.clear();
 374         return fullpath;
 375       }
 376
 377       /// This method processes a linkage item. The item could be a
 378       /// Bytecode file needing translation to native code and that is
 379       /// dependent on other bytecode libraries, or a native code
 380       /// library that should just be linked into the program.
 381       bool ProcessLinkageItem(const llvm::sys::Path& link_item,
 382                               SetVector<sys::Path>& set,
 383                               std::string& err) {
 384         // First, see if the unadorned file name is not readable. If so,
 385         // we must track down the file in the lib search path.
 386         sys::Path fullpath;
 387         if (!link_item.readable()) {
 388           // First, look for the library using the -L arguments specified
 389           // on the command line.
 390           PathVector::iterator PI = LibraryPaths.begin();
 391           PathVector::iterator PE = LibraryPaths.end();
 392           while (PI != PE && fullpath.is_empty()) {
 393             fullpath = GetPathForLinkageItem(link_item.get(),*PI);
 394             ++PI;
 395           }
 396
 397           // If we didn't find the file in any of the library search paths
 398           // so we have to bail. No where else to look.
 399           if (fullpath.is_empty()) {
 400             err = std::string("Can't find linkage item '") + link_item.get() + "'";
 401             return false;
 402           }
 403         } else {
 404           fullpath = link_item;
 405         }
 406
 407         // If we got here fullpath is the path to the file, and its readable.
 408         set.insert(fullpath);
 409
 410         // If its an LLVM bytecode file ...
 411         if (CheckMagic(fullpath.get(), "llvm")) {
 412           // Process the dependent libraries recursively
 413           Module::LibraryListType modlibs;
 414           if (GetBytecodeDependentLibraries(fullpath.get(),modlibs)) {
 415             // Traverse the dependent libraries list
 416             Module::lib_iterator LI = modlibs.begin();
 417             Module::lib_iterator LE = modlibs.end();
 418             while ( LI != LE ) {
 419               if (!ProcessLinkageItem(sys::Path(*LI),set,err)) {
 420                 if (err.empty()) {
 421                   err = std::string("Library '") + *LI +
 422                         "' is not valid for linking but is required by file '" +
 423                         fullpath.get() + "'";
 424                 } else {
 425                   err += " which is required by file '" + fullpath.get() + "'";
 426                 }
 427                 return false;
 428               }
 429               ++LI;
 430             }
 431           } else if (err.empty()) {
 432             err = std::string("The dependent libraries could not be extracted from '")
 433                               + fullpath.get();
 434             return false;
 435           }
 436         }
 437         return true;
 438       }
 439
 440     /// @}
 441     /// @name Methods
 442     /// @{
 443     public:
 444       virtual int execute(const InputList& InpList, const sys::Path& Output ) {
 445         try {
 446           // Echo the configuration of options if we're running verbose
 447           if (isSet(DEBUG_FLAG)) {
 448             std::cerr << "Compiler Driver Options:\n";
 449             std::cerr << "DryRun = " << isSet(DRY_RUN_FLAG) << "\n";
 450             std::cerr << "Verbose = " << isSet(VERBOSE_FLAG) << " \n";
 451             std::cerr << "TimeActions = " << isSet(TIME_ACTIONS_FLAG) << "\n";
 452             std::cerr << "TimePasses = " << isSet(TIME_PASSES_FLAG) << "\n";
 453             std::cerr << "ShowStats = " << isSet(SHOW_STATS_FLAG) << "\n";
 454             std::cerr << "EmitRawCode = " << isSet(EMIT_RAW_FLAG) << "\n";
 455             std::cerr << "EmitNativeCode = " << isSet(EMIT_NATIVE_FLAG) << "\n";
 456             std::cerr << "ForceOutput = " << isSet(FORCE_FLAG) << "\n";
 457             std::cerr << "KeepTemps = " << isSet(KEEP_TEMPS_FLAG) << "\n";
 458             std::cerr << "OutputMachine = " << machine << "\n";
 459             InputList::const_iterator I = InpList.begin();
 460             while ( I != InpList.end() ) {
 461               std::cerr << "Input: " << I->first.get() << "(" << I->second << ")\n";
 462               ++I;
 463             }
 464             std::cerr << "Output: " << Output.get() << "\n";
 465           }
 466
 467           // If there's no input, we're done.
 468           if (InpList.empty())
 469             throw std::string("Nothing to compile.");
 470
 471           // If they are asking for linking and didn't provide an output
 472           // file then its an error (no way for us to "make up" a meaningful
 473           // file name based on the various linker input files).
 474           if (finalPhase == LINKING && Output.is_empty())
 475             throw std::string(
 476               "An output file name must be specified for linker output");
 477
 478           // This vector holds all the resulting actions of the following loop.
 479           std::vector<Action*> actions;
 480
 481           /// PRE-PROCESSING / TRANSLATION / OPTIMIZATION / ASSEMBLY phases
 482           // for each input item
 483           SetVector<sys::Path> LinkageItems;
 484           sys::Path OutFile(Output);
 485           InputList::const_iterator I = InpList.begin();
 486           while ( I != InpList.end() ) {
 487             // Get the suffix of the file name
 488             const std::string& ftype = I->second;
 489
 490             // If its a library, bytecode file, or object file, save
 491             // it for linking below and short circuit the
 492             // pre-processing/translation/assembly phases
 493             if (ftype.empty() ||  ftype == "o" || ftype == "bc") {
 494               // We shouldn't get any of these types of files unless we're
 495               // later going to link. Enforce this limit now.
 496               if (finalPhase != LINKING) {
 497                 throw std::string(
 498                   "Pre-compiled objects found but linking not requested");
 499               }
 500               LinkageItems.insert(I->first);
 501               ++I; continue; // short circuit remainder of loop
 502             }
 503
 504             // At this point, we know its something we need to translate
 505             // and/or optimize. See if we can get the configuration data
 506             // for this kind of file.
 507             ConfigData* cd = cdp->ProvideConfigData(I->second);
 508             if (cd == 0)
 509               throw std::string("Files of type '") + I->second +
 510                     "' are not recognized.";
 511             if (isSet(DEBUG_FLAG))
 512               DumpConfigData(cd,I->second);
 513
 514             // Initialize the input file
 515             sys::Path InFile(I->first);
 516
 517             // PRE-PROCESSING PHASE
 518             Action& action = cd->PreProcessor;
 519
 520             // Get the preprocessing action, if needed, or error if appropriate
 521             if (!action.program.is_empty()) {
 522               if (action.isSet(REQUIRED_FLAG) || finalPhase == PREPROCESSING) {
 523                 if (finalPhase == PREPROCESSING)
 524                   actions.push_back(GetAction(cd,InFile,OutFile,PREPROCESSING));
 525                 else {
 526                   sys::Path TempFile(MakeTempFile(I->first.get(),"E"));
 527                   actions.push_back(GetAction(cd,InFile,TempFile,PREPROCESSING));
 528                   InFile = TempFile;
 529                 }
 530               }
 531             } else if (finalPhase == PREPROCESSING) {
 532               throw cd->langName + " does not support pre-processing";
 533             } else if (action.isSet(REQUIRED_FLAG)) {
 534               throw std::string("Don't know how to pre-process ") +
 535                     cd->langName + " files";
 536             }
 537
 538             // Short-circuit remaining actions if all they want is pre-processing
 539             if (finalPhase == PREPROCESSING) { ++I; continue; };
 540
 541             /// TRANSLATION PHASE
 542             action = cd->Translator;
 543
 544             // Get the translation action, if needed, or error if appropriate
 545             if (!action.program.is_empty()) {
 546               if (action.isSet(REQUIRED_FLAG) || finalPhase == TRANSLATION) {
 547                 if (finalPhase == TRANSLATION)
 548                   actions.push_back(GetAction(cd,InFile,OutFile,TRANSLATION));
 549                 else {
 550                   sys::Path TempFile(MakeTempFile(I->first.get(),"trans"));
 551                   actions.push_back(GetAction(cd,InFile,TempFile,TRANSLATION));
 552                   InFile = TempFile;
 553                 }
 554
 555                 // ll -> bc Helper
 556                 if (action.isSet(OUTPUT_IS_ASM_FLAG)) {
 557                   /// The output of the translator is an LLVM Assembly program
 558                   /// We need to translate it to bytecode
 559                   Action* action = new Action();
 560                   action->program.set_file("llvm-as");
 561                   action->args.push_back(InFile.get());
 562                   action->args.push_back("-o");
 563                   InFile.append_suffix("bc");
 564                   action->args.push_back(InFile.get());
 565                   actions.push_back(action);
 566                 }
 567               }
 568             } else if (finalPhase == TRANSLATION) {
 569               throw cd->langName + " does not support translation";
 570             } else if (action.isSet(REQUIRED_FLAG)) {
 571               throw std::string("Don't know how to translate ") +
 572                     cd->langName + " files";
 573             }
 574
 575             // Short-circuit remaining actions if all they want is translation
 576             if (finalPhase == TRANSLATION) { ++I; continue; }
 577
 578             /// OPTIMIZATION PHASE
 579             action = cd->Optimizer;
 580
 581             // Get the optimization action, if needed, or error if appropriate
 582             if (!isSet(EMIT_RAW_FLAG)) {
 583               if (!action.program.is_empty()) {
 584                 if (action.isSet(REQUIRED_FLAG) || finalPhase == OPTIMIZATION) {
 585                   if (finalPhase == OPTIMIZATION)
 586                     actions.push_back(GetAction(cd,InFile,OutFile,OPTIMIZATION));
 587                   else {
 588                     sys::Path TempFile(MakeTempFile(I->first.get(),"opt"));
 589                     actions.push_back(GetAction(cd,InFile,TempFile,OPTIMIZATION));
 590                     InFile = TempFile;
 591                   }
 592                   // ll -> bc Helper
 593                   if (action.isSet(OUTPUT_IS_ASM_FLAG)) {
 594                     /// The output of the translator is an LLVM Assembly program
 595                     /// We need to translate it to bytecode
 596                     Action* action = new Action();
 597                     action->program.set_file("llvm-as");
 598                     action->args.push_back(InFile.get());
 599                     action->args.push_back("-f");
 600                     action->args.push_back("-o");
 601                     InFile.append_suffix("bc");
 602                     action->args.push_back(InFile.get());
 603                     actions.push_back(action);
 604                   }
 605                 }
 606               } else if (finalPhase == OPTIMIZATION) {
 607                 throw cd->langName + " does not support optimization";
 608               } else if (action.isSet(REQUIRED_FLAG)) {
 609                 throw std::string("Don't know how to optimize ") +
 610                     cd->langName + " files";
 611               }
 612             }
 613
 614             // Short-circuit remaining actions if all they want is optimization
 615             if (finalPhase == OPTIMIZATION) { ++I; continue; }
 616
 617             /// ASSEMBLY PHASE
 618             action = cd->Assembler;
 619
 620             if (finalPhase == ASSEMBLY || isSet(EMIT_NATIVE_FLAG)) {
 621               if (isSet(EMIT_NATIVE_FLAG)) {
 622                 if (action.program.is_empty()) {
 623                   throw std::string("Native Assembler not specified for ") +
 624                         cd->langName + " files";
 625                 } else if (finalPhase == ASSEMBLY) {
 626                   actions.push_back(GetAction(cd,InFile,OutFile,ASSEMBLY));
 627                 } else {
 628                   sys::Path TempFile(MakeTempFile(I->first.get(),"S"));
 629                   actions.push_back(GetAction(cd,InFile,TempFile,ASSEMBLY));
 630                   InFile = TempFile;
 631                 }
 632               } else {
 633                 // Just convert back to llvm assembly with llvm-dis
 634                 Action* action = new Action();
 635                 action->program.set_file("llvm-dis");
 636                 action->args.push_back(InFile.get());
 637                 action->args.push_back("-f");
 638                 action->args.push_back("-o");
 639                 action->args.push_back(OutFile.get());
 640                 actions.push_back(action);
 641               }
 642             }
 643
 644             // Short-circuit remaining actions if all they want is assembly output
 645             if (finalPhase == ASSEMBLY) { ++I; continue; }
 646
 647             // Register the OutFile as a link candidate
 648             LinkageItems.insert(InFile);
 649
 650             // Go to next file to be processed
 651             ++I;
 652           }
 653
 654           /// RUN THE COMPILATION ACTIONS
 655           std::vector<Action*>::iterator AI = actions.begin();
 656           std::vector<Action*>::iterator AE = actions.end();
 657           while (AI != AE) {
 658             if (!DoAction(*AI))
 659               throw std::string("Action failed");
 660             AI++;
 661           }
 662
 663           /// LINKING PHASE
 664           actions.clear();
 665           if (finalPhase == LINKING) {
 666             if (isSet(EMIT_NATIVE_FLAG)) {
 667               throw std::string(
 668                 "llvmc doesn't know how to link native code yet");
 669             } else {
 670               // First, we need to examine the files to ensure that they all contain
 671               // bytecode files. Since the final output is bytecode, we can only
 672               // link bytecode.
 673               SetVector<sys::Path>::const_iterator I = LinkageItems.begin();
 674               SetVector<sys::Path>::const_iterator E = LinkageItems.end();
 675               std::string errmsg;
 676
 677               while (I != E && ProcessLinkageItem(*I,LinkageItems,errmsg))
 678                 ++I;
 679
 680               if (!errmsg.empty())
 681                 throw errmsg;
 682
 683               // Insert the system libraries.
 684               LibraryPaths.push_back(sys::Path::GetSystemLibraryPath1());
 685               LibraryPaths.push_back(sys::Path::GetSystemLibraryPath2());
 686
 687               // We're emitting bytecode so let's build an llvm-link Action
 688               Action* link = new Action();
 689               link->program.set_file("llvm-link");
 690               for (PathVector::const_iterator I=LinkageItems.begin(),
 691                    E=LinkageItems.end(); I != E; ++I )
 692                 link->args.push_back(I->get());
 693               if (isSet(VERBOSE_FLAG))
 694                 link->args.push_back("-v");
 695               link->args.push_back("-f");
 696               link->args.push_back("-o");
 697               link->args.push_back(OutFile.get());
 698               if (isSet(TIME_PASSES_FLAG))
 699                 link->args.push_back("-time-passes");
 700               if (isSet(SHOW_STATS_FLAG))
 701                 link->args.push_back("-stats");
 702               actions.push_back(link);
 703             }
 704           }
 705
 706           /// RUN THE LINKING ACTIONS
 707           AI = actions.begin();
 708           AE = actions.end();
 709           while (AI != AE) {
 710             if (!DoAction(*AI))
 711               throw std::string("Action failed");
 712             AI++;
 713           }
 714         } catch (std::string& msg) {
 715           cleanup();
 716           throw;
 717         } catch (...) {
 718           cleanup();
 719           throw std::string("Unspecified error");
 720         }
 721         cleanup();
 722         return 0;
 723       }
 724
 725     /// @}
 726     /// @name Data
 727     /// @{
 728     private:
 729       ConfigDataProvider* cdp;      ///< Where we get configuration data from
 730       Phases finalPhase;            ///< The final phase of compilation
 731       OptimizationLevels optLevel;  ///< The optimization level to apply
 732       unsigned Flags;               ///< The driver flags
 733       std::string machine;          ///< Target machine name
 734       PathVector LibraryPaths;      ///< -L options
 735       PathVector IncludePaths;      ///< -I options
 736       StringVector Defines;         ///< -D options
 737       sys::Path TempDir;            ///< Name of the temporary directory.
 738       StringTable AdditionalArgs;   ///< The -Txyz options
 739
 740     /// @}
 741   };
 742 }
 743
 744 CompilerDriver::~CompilerDriver() {
 745 }
 746
 747 CompilerDriver*
 748 CompilerDriver::Get(ConfigDataProvider& CDP) {
 749   return new CompilerDriverImpl(CDP);
 750 }
 751
 752 CompilerDriver::ConfigData::ConfigData()
 753   : langName()
 754   , PreProcessor()
 755   , Translator()
 756   , Optimizer()
 757   , Assembler()
 758   , Linker()
 759 {
 760   StringVector emptyVec;
 761   for (unsigned i = 0; i < NUM_PHASES; ++i)
 762     opts.push_back(emptyVec);
 763 }
 764
 765 // vim: sw=2 smartindent smarttab tw=80 autoindent expandtab