lib/Driver/Driver.cpp

   1 //===--- Driver.cpp - Clang GCC Compatible Driver -----------------------*-===//
   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 #include "clang/Driver/Driver.h"
  11
  12 #include "clang/Driver/Action.h"
  13 #include "clang/Driver/Arg.h"
  14 #include "clang/Driver/ArgList.h"
  15 #include "clang/Driver/Compilation.h"
  16 #include "clang/Driver/DriverDiagnostic.h"
  17 #include "clang/Driver/HostInfo.h"
  18 #include "clang/Driver/Job.h"
  19 #include "clang/Driver/Option.h"
  20 #include "clang/Driver/Options.h"
  21 #include "clang/Driver/Tool.h"
  22 #include "clang/Driver/ToolChain.h"
  23 #include "clang/Driver/Types.h"
  24
  25 #include "clang/Basic/Version.h"
  26
  27 #include "llvm/ADT/StringSet.h"
  28 #include "llvm/Support/PrettyStackTrace.h"
  29 #include "llvm/Support/raw_ostream.h"
  30 #include "llvm/System/Path.h"
  31 #include "llvm/System/Program.h"
  32
  33 #include "InputInfo.h"
  34
  35 #include <map>
  36
  37 using namespace clang::driver;
  38 using namespace clang;
  39
  40 Driver::Driver(const char *_Name, const char *_Dir,
  41                const char *_DefaultHostTriple,
  42                const char *_DefaultImageName,
  43                Diagnostic &_Diags)
  44   : Opts(new OptTable()), Diags(_Diags),
  45     Name(_Name), Dir(_Dir), DefaultHostTriple(_DefaultHostTriple),
  46     DefaultImageName(_DefaultImageName),
  47     Host(0),
  48     CCCIsCXX(false), CCCEcho(false), CCCPrintBindings(false),
  49     CCCGenericGCCName("gcc"), CCCUseClang(true), CCCUseClangCXX(false),
  50     CCCUseClangCPP(true), CCCUsePCH(true),
  51     SuppressMissingInputWarning(false)
  52 {
  53   // Only use clang on i386 and x86_64 by default.
  54   CCCClangArchs.insert("i386");
  55   CCCClangArchs.insert("x86_64");
  56 }
  57
  58 Driver::~Driver() {
  59   delete Opts;
  60   delete Host;
  61 }
  62
  63 InputArgList *Driver::ParseArgStrings(const char **ArgBegin,
  64                                       const char **ArgEnd) {
  65   llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
  66   InputArgList *Args = new InputArgList(ArgBegin, ArgEnd);
  67
  68   // FIXME: Handle '@' args (or at least error on them).
  69
  70   unsigned Index = 0, End = ArgEnd - ArgBegin;
  71   while (Index < End) {
  72     // gcc's handling of empty arguments doesn't make
  73     // sense, but this is not a common use case. :)
  74     //
  75     // We just ignore them here (note that other things may
  76     // still take them as arguments).
  77     if (Args->getArgString(Index)[0] == '\0') {
  78       ++Index;
  79       continue;
  80     }
  81
  82     unsigned Prev = Index;
  83     Arg *A = getOpts().ParseOneArg(*Args, Index);
  84     assert(Index > Prev && "Parser failed to consume argument.");
  85
  86     // Check for missing argument error.
  87     if (!A) {
  88       assert(Index >= End && "Unexpected parser error.");
  89       Diag(clang::diag::err_drv_missing_argument)
  90         << Args->getArgString(Prev)
  91         << (Index - Prev - 1);
  92       break;
  93     }
  94
  95     if (A->getOption().isUnsupported()) {
  96       Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
  97       continue;
  98     }
  99     Args->append(A);
 100   }
 101
 102   return Args;
 103 }
 104
 105 Compilation *Driver::BuildCompilation(int argc, const char **argv) {
 106   llvm::PrettyStackTraceString CrashInfo("Compilation construction");
 107
 108   // FIXME: Handle environment options which effect driver behavior,
 109   // somewhere (client?). GCC_EXEC_PREFIX, COMPILER_PATH,
 110   // LIBRARY_PATH, LPATH, CC_PRINT_OPTIONS, QA_OVERRIDE_GCC3_OPTIONS.
 111
 112   // FIXME: What are we going to do with -V and -b?
 113
 114   // FIXME: This stuff needs to go into the Compilation, not the
 115   // driver.
 116   bool CCCPrintOptions = false, CCCPrintActions = false;
 117
 118   const char **Start = argv + 1, **End = argv + argc;
 119   const char *HostTriple = DefaultHostTriple.c_str();
 120
 121   // Read -ccc args.
 122   //
 123   // FIXME: We need to figure out where this behavior should
 124   // live. Most of it should be outside in the client; the parts that
 125   // aren't should have proper options, either by introducing new ones
 126   // or by overloading gcc ones like -V or -b.
 127   for (; Start != End && memcmp(*Start, "-ccc-", 5) == 0; ++Start) {
 128     const char *Opt = *Start + 5;
 129
 130     if (!strcmp(Opt, "print-options")) {
 131       CCCPrintOptions = true;
 132     } else if (!strcmp(Opt, "print-phases")) {
 133       CCCPrintActions = true;
 134     } else if (!strcmp(Opt, "print-bindings")) {
 135       CCCPrintBindings = true;
 136     } else if (!strcmp(Opt, "cxx")) {
 137       CCCIsCXX = true;
 138     } else if (!strcmp(Opt, "echo")) {
 139       CCCEcho = true;
 140
 141     } else if (!strcmp(Opt, "gcc-name")) {
 142       assert(Start+1 < End && "FIXME: -ccc- argument handling.");
 143       CCCGenericGCCName = *++Start;
 144
 145     } else if (!strcmp(Opt, "clang-cxx")) {
 146       CCCUseClangCXX = true;
 147     } else if (!strcmp(Opt, "pch-is-pch")) {
 148       CCCUsePCH = true;
 149     } else if (!strcmp(Opt, "pch-is-pth")) {
 150       CCCUsePCH = false;
 151     } else if (!strcmp(Opt, "no-clang")) {
 152       CCCUseClang = false;
 153     } else if (!strcmp(Opt, "no-clang-cpp")) {
 154       CCCUseClangCPP = false;
 155     } else if (!strcmp(Opt, "clang-archs")) {
 156       assert(Start+1 < End && "FIXME: -ccc- argument handling.");
 157       const char *Cur = *++Start;
 158
 159       CCCClangArchs.clear();
 160       for (;;) {
 161         const char *Next = strchr(Cur, ',');
 162
 163         if (Next) {
 164           if (Cur != Next)
 165             CCCClangArchs.insert(std::string(Cur, Next));
 166           Cur = Next + 1;
 167         } else {
 168           if (*Cur != '\0')
 169             CCCClangArchs.insert(std::string(Cur));
 170           break;
 171         }
 172       }
 173
 174     } else if (!strcmp(Opt, "host-triple")) {
 175       assert(Start+1 < End && "FIXME: -ccc- argument handling.");
 176       HostTriple = *++Start;
 177
 178     } else {
 179       // FIXME: Error handling.
 180       llvm::errs() << "invalid option: " << *Start << "\n";
 181       exit(1);
 182     }
 183   }
 184
 185   InputArgList *Args = ParseArgStrings(Start, End);
 186
 187   Host = GetHostInfo(HostTriple);
 188
 189   // The compilation takes ownership of Args.
 190   Compilation *C = new Compilation(*this, *Host->getToolChain(*Args), Args);
 191
 192   // FIXME: This behavior shouldn't be here.
 193   if (CCCPrintOptions) {
 194     PrintOptions(C->getArgs());
 195     return C;
 196   }
 197
 198   if (!HandleImmediateArgs(*C))
 199     return C;
 200
 201   // Construct the list of abstract actions to perform for this
 202   // compilation. We avoid passing a Compilation here simply to
 203   // enforce the abstraction that pipelining is not host or toolchain
 204   // dependent (other than the driver driver test).
 205   if (Host->useDriverDriver())
 206     BuildUniversalActions(C->getArgs(), C->getActions());
 207   else
 208     BuildActions(C->getArgs(), C->getActions());
 209
 210   if (CCCPrintActions) {
 211     PrintActions(*C);
 212     return C;
 213   }
 214
 215   BuildJobs(*C);
 216
 217   return C;
 218 }
 219
 220 int Driver::ExecuteCompilation(const Compilation &C) const {
 221   // Just print if -### was present.
 222   if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
 223     C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
 224     return 0;
 225   }
 226
 227   // If there were errors building the compilation, quit now.
 228   if (getDiags().getNumErrors())
 229     return 1;
 230
 231   const Command *FailingCommand = 0;
 232   int Res = C.ExecuteJob(C.getJobs(), FailingCommand);
 233
 234   // Remove temp files.
 235   C.CleanupFileList(C.getTempFiles());
 236
 237   // If the compilation failed, remove result files as well.
 238   if (Res != 0 && !C.getArgs().hasArg(options::OPT_save_temps))
 239     C.CleanupFileList(C.getResultFiles(), true);
 240
 241   // Print extra information about abnormal failures, if possible.
 242   if (Res) {
 243     // This is ad-hoc, but we don't want to be excessively noisy. If the result
 244     // status was 1, assume the command failed normally. In particular, if it
 245     // was the compiler then assume it gave a reasonable error code. Failures in
 246     // other tools are less common, and they generally have worse diagnostics,
 247     // so always print the diagnostic there.
 248     const Action &Source = FailingCommand->getSource();
 249     bool IsFriendlyTool = (isa<PreprocessJobAction>(Source) ||
 250                            isa<PrecompileJobAction>(Source) ||
 251                            isa<AnalyzeJobAction>(Source) ||
 252                            isa<CompileJobAction>(Source));
 253
 254     if (!IsFriendlyTool || Res != 1) {
 255       // FIXME: See FIXME above regarding result code interpretation.
 256       if (Res < 0)
 257         Diag(clang::diag::err_drv_command_signalled)
 258           << Source.getClassName() << -Res;
 259       else
 260         Diag(clang::diag::err_drv_command_failed)
 261           << Source.getClassName() << Res;
 262     }
 263   }
 264
 265   return Res;
 266 }
 267
 268 void Driver::PrintOptions(const ArgList &Args) const {
 269   unsigned i = 0;
 270   for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
 271        it != ie; ++it, ++i) {
 272     Arg *A = *it;
 273     llvm::errs() << "Option " << i << " - "
 274                  << "Name: \"" << A->getOption().getName() << "\", "
 275                  << "Values: {";
 276     for (unsigned j = 0; j < A->getNumValues(); ++j) {
 277       if (j)
 278         llvm::errs() << ", ";
 279       llvm::errs() << '"' << A->getValue(Args, j) << '"';
 280     }
 281     llvm::errs() << "}\n";
 282   }
 283 }
 284
 285 static std::string getOptionHelpName(const OptTable &Opts, options::ID Id) {
 286   std::string Name = Opts.getOptionName(Id);
 287
 288   // Add metavar, if used.
 289   switch (Opts.getOptionKind(Id)) {
 290   case Option::GroupClass: case Option::InputClass: case Option::UnknownClass:
 291     assert(0 && "Invalid option with help text.");
 292
 293   case Option::MultiArgClass: case Option::JoinedAndSeparateClass:
 294     assert(0 && "Cannot print metavar for this kind of option.");
 295
 296   case Option::FlagClass:
 297     break;
 298
 299   case Option::SeparateClass: case Option::JoinedOrSeparateClass:
 300     Name += ' ';
 301     // FALLTHROUGH
 302   case Option::JoinedClass: case Option::CommaJoinedClass:
 303     Name += Opts.getOptionMetaVar(Id);
 304     break;
 305   }
 306
 307   return Name;
 308 }
 309
 310 void Driver::PrintHelp(bool ShowHidden) const {
 311   llvm::raw_ostream &OS = llvm::outs();
 312
 313   OS << "OVERVIEW: clang \"gcc-compatible\" driver\n";
 314   OS << '\n';
 315   OS << "USAGE: " << Name << " [options] <input files>\n";
 316   OS << '\n';
 317   OS << "OPTIONS:\n";
 318
 319   // Render help text into (option, help) pairs.
 320   std::vector< std::pair<std::string, const char*> > OptionHelp;
 321
 322   for (unsigned i = options::OPT_INPUT, e = options::LastOption; i != e; ++i) {
 323     options::ID Id = (options::ID) i;
 324     if (const char *Text = getOpts().getOptionHelpText(Id))
 325       OptionHelp.push_back(std::make_pair(getOptionHelpName(getOpts(), Id),
 326                                           Text));
 327   }
 328
 329   if (ShowHidden) {
 330     OptionHelp.push_back(std::make_pair("\nDRIVER OPTIONS:",""));
 331     OptionHelp.push_back(std::make_pair("-ccc-cxx",
 332                                         "Act as a C++ driver"));
 333     OptionHelp.push_back(std::make_pair("-ccc-gcc-name",
 334                                         "Name for native GCC compiler"));
 335     OptionHelp.push_back(std::make_pair("-ccc-clang-cxx",
 336                                         "Use the clang compiler for C++"));
 337     OptionHelp.push_back(std::make_pair("-ccc-no-clang",
 338                                         "Never use the clang compiler"));
 339     OptionHelp.push_back(std::make_pair("-ccc-no-clang-cpp",
 340                                         "Never use the clang preprocessor"));
 341     OptionHelp.push_back(std::make_pair("-ccc-clang-archs",
 342                                         "Comma separate list of architectures "
 343                                         "to use the clang compiler for"));
 344     OptionHelp.push_back(std::make_pair("-ccc-pch-is-pch",
 345                                      "Use lazy PCH for precompiled headers"));
 346     OptionHelp.push_back(std::make_pair("-ccc-pch-is-pth",
 347                          "Use pretokenized headers for precompiled headers"));
 348
 349     OptionHelp.push_back(std::make_pair("\nDEBUG/DEVELOPMENT OPTIONS:",""));
 350     OptionHelp.push_back(std::make_pair("-ccc-host-triple",
 351                                         "Simulate running on the given target"));
 352     OptionHelp.push_back(std::make_pair("-ccc-print-options",
 353                                         "Dump parsed command line arguments"));
 354     OptionHelp.push_back(std::make_pair("-ccc-print-phases",
 355                                         "Dump list of actions to perform"));
 356     OptionHelp.push_back(std::make_pair("-ccc-print-bindings",
 357                                         "Show bindings of tools to actions"));
 358     OptionHelp.push_back(std::make_pair("CCC_ADD_ARGS",
 359                                "(ENVIRONMENT VARIABLE) Comma separated list of "
 360                                "arguments to prepend to the command line"));
 361   }
 362
 363   // Find the maximum option length.
 364   unsigned OptionFieldWidth = 0;
 365   for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
 366     // Skip titles.
 367     if (!OptionHelp[i].second)
 368       continue;
 369
 370     // Limit the amount of padding we are willing to give up for
 371     // alignment.
 372     unsigned Length = OptionHelp[i].first.size();
 373     if (Length <= 23)
 374       OptionFieldWidth = std::max(OptionFieldWidth, Length);
 375   }
 376
 377   for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
 378     const std::string &Option = OptionHelp[i].first;
 379     OS << "  " << Option;
 380     for (int j = Option.length(), e = OptionFieldWidth; j < e; ++j)
 381       OS << ' ';
 382     OS << ' ' << OptionHelp[i].second << '\n';
 383   }
 384
 385   OS.flush();
 386 }
 387
 388 void Driver::PrintVersion(const Compilation &C) const {
 389   static char buf[] = "$URL$";
 390   char *zap = strstr(buf, "/lib/Driver");
 391   if (zap)
 392     *zap = 0;
 393   zap = strstr(buf, "/clang/tools/clang");
 394   if (zap)
 395     *zap = 0;
 396   const char *vers = buf+6;
 397   // FIXME: Add cmake support and remove #ifdef
 398 #ifdef SVN_REVISION
 399   const char *revision = SVN_REVISION;
 400 #else
 401   const char *revision = "";
 402 #endif
 403   // FIXME: The following handlers should use a callback mechanism, we
 404   // don't know what the client would like to do.
 405
 406   llvm::errs() << "clang version " CLANG_VERSION_STRING " ("
 407                << vers << " " << revision << ")" << '\n';
 408
 409   const ToolChain &TC = C.getDefaultToolChain();
 410   llvm::errs() << "Target: " << TC.getTripleString() << '\n';
 411
 412   // Print the threading model.
 413   //
 414   // FIXME: Implement correctly.
 415   llvm::errs() << "Thread model: " << "posix" << '\n';
 416 }
 417
 418 bool Driver::HandleImmediateArgs(const Compilation &C) {
 419   // The order these options are handled in in gcc is all over the
 420   // place, but we don't expect inconsistencies w.r.t. that to matter
 421   // in practice.
 422
 423   if (C.getArgs().hasArg(options::OPT_dumpversion)) {
 424     llvm::outs() << CLANG_VERSION_STRING "\n";
 425     return false;
 426   }
 427
 428   if (C.getArgs().hasArg(options::OPT__help) ||
 429       C.getArgs().hasArg(options::OPT__help_hidden)) {
 430     PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
 431     return false;
 432   }
 433
 434   if (C.getArgs().hasArg(options::OPT__version)) {
 435     PrintVersion(C);
 436     return false;
 437   }
 438
 439   if (C.getArgs().hasArg(options::OPT_v) ||
 440       C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
 441     PrintVersion(C);
 442     SuppressMissingInputWarning = true;
 443   }
 444
 445   const ToolChain &TC = C.getDefaultToolChain();
 446   if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
 447     llvm::outs() << "programs: =";
 448     for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
 449            ie = TC.getProgramPaths().end(); it != ie; ++it) {
 450       if (it != TC.getProgramPaths().begin())
 451         llvm::outs() << ':';
 452       llvm::outs() << *it;
 453     }
 454     llvm::outs() << "\n";
 455     llvm::outs() << "libraries: =";
 456     for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
 457            ie = TC.getFilePaths().end(); it != ie; ++it) {
 458       if (it != TC.getFilePaths().begin())
 459         llvm::outs() << ':';
 460       llvm::outs() << *it;
 461     }
 462     llvm::outs() << "\n";
 463     return false;
 464   }
 465
 466   // FIXME: The following handlers should use a callback mechanism, we
 467   // don't know what the client would like to do.
 468   if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
 469     llvm::outs() << GetFilePath(A->getValue(C.getArgs()), TC).toString()
 470                  << "\n";
 471     return false;
 472   }
 473
 474   if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
 475     llvm::outs() << GetProgramPath(A->getValue(C.getArgs()), TC).toString()
 476                  << "\n";
 477     return false;
 478   }
 479
 480   if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
 481     llvm::outs() << GetFilePath("libgcc.a", TC).toString() << "\n";
 482     return false;
 483   }
 484
 485   if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
 486     // FIXME: We need tool chain support for this.
 487     llvm::outs() << ".;\n";
 488
 489     switch (C.getDefaultToolChain().getTriple().getArch()) {
 490     default:
 491       break;
 492
 493     case llvm::Triple::x86_64:
 494       llvm::outs() << "x86_64;@m64" << "\n";
 495       break;
 496
 497     case llvm::Triple::ppc64:
 498       llvm::outs() << "ppc64;@m64" << "\n";
 499       break;
 500     }
 501     return false;
 502   }
 503
 504   // FIXME: What is the difference between print-multi-directory and
 505   // print-multi-os-directory?
 506   if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
 507       C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
 508     switch (C.getDefaultToolChain().getTriple().getArch()) {
 509     default:
 510     case llvm::Triple::x86:
 511     case llvm::Triple::ppc:
 512       llvm::outs() << "." << "\n";
 513       break;
 514
 515     case llvm::Triple::x86_64:
 516       llvm::outs() << "x86_64" << "\n";
 517       break;
 518
 519     case llvm::Triple::ppc64:
 520       llvm::outs() << "ppc64" << "\n";
 521       break;
 522     }
 523     return false;
 524   }
 525
 526   return true;
 527 }
 528
 529 static unsigned PrintActions1(const Compilation &C,
 530                               Action *A,
 531                               std::map<Action*, unsigned> &Ids) {
 532   if (Ids.count(A))
 533     return Ids[A];
 534
 535   std::string str;
 536   llvm::raw_string_ostream os(str);
 537
 538   os << Action::getClassName(A->getKind()) << ", ";
 539   if (InputAction *IA = dyn_cast<InputAction>(A)) {
 540     os << "\"" << IA->getInputArg().getValue(C.getArgs()) << "\"";
 541   } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
 542     os << '"' << (BIA->getArchName() ? BIA->getArchName() :
 543                   C.getDefaultToolChain().getArchName()) << '"'
 544        << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
 545   } else {
 546     os << "{";
 547     for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
 548       os << PrintActions1(C, *it, Ids);
 549       ++it;
 550       if (it != ie)
 551         os << ", ";
 552     }
 553     os << "}";
 554   }
 555
 556   unsigned Id = Ids.size();
 557   Ids[A] = Id;
 558   llvm::errs() << Id << ": " << os.str() << ", "
 559                << types::getTypeName(A->getType()) << "\n";
 560
 561   return Id;
 562 }
 563
 564 void Driver::PrintActions(const Compilation &C) const {
 565   std::map<Action*, unsigned> Ids;
 566   for (ActionList::const_iterator it = C.getActions().begin(),
 567          ie = C.getActions().end(); it != ie; ++it)
 568     PrintActions1(C, *it, Ids);
 569 }
 570
 571 void Driver::BuildUniversalActions(const ArgList &Args,
 572                                    ActionList &Actions) const {
 573   llvm::PrettyStackTraceString CrashInfo("Building actions for universal build");
 574   // Collect the list of architectures. Duplicates are allowed, but
 575   // should only be handled once (in the order seen).
 576   llvm::StringSet<> ArchNames;
 577   llvm::SmallVector<const char *, 4> Archs;
 578   for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
 579        it != ie; ++it) {
 580     Arg *A = *it;
 581
 582     if (A->getOption().getId() == options::OPT_arch) {
 583       const char *Name = A->getValue(Args);
 584
 585       // FIXME: We need to handle canonicalization of the specified
 586       // arch?
 587
 588       A->claim();
 589       if (ArchNames.insert(Name))
 590         Archs.push_back(Name);
 591     }
 592   }
 593
 594   // When there is no explicit arch for this platform, make sure we
 595   // still bind the architecture (to the default) so that -Xarch_ is
 596   // handled correctly.
 597   if (!Archs.size())
 598     Archs.push_back(0);
 599
 600   // FIXME: We killed off some others but these aren't yet detected in
 601   // a functional manner. If we added information to jobs about which
 602   // "auxiliary" files they wrote then we could detect the conflict
 603   // these cause downstream.
 604   if (Archs.size() > 1) {
 605     // No recovery needed, the point of this is just to prevent
 606     // overwriting the same files.
 607     if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
 608       Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
 609         << A->getAsString(Args);
 610   }
 611
 612   ActionList SingleActions;
 613   BuildActions(Args, SingleActions);
 614
 615   // Add in arch binding and lipo (if necessary) for every top level
 616   // action.
 617   for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
 618     Action *Act = SingleActions[i];
 619
 620     // Make sure we can lipo this kind of output. If not (and it is an
 621     // actual output) then we disallow, since we can't create an
 622     // output file with the right name without overwriting it. We
 623     // could remove this oddity by just changing the output names to
 624     // include the arch, which would also fix
 625     // -save-temps. Compatibility wins for now.
 626
 627     if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
 628       Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
 629         << types::getTypeName(Act->getType());
 630
 631     ActionList Inputs;
 632     for (unsigned i = 0, e = Archs.size(); i != e; ++i)
 633       Inputs.push_back(new BindArchAction(Act, Archs[i]));
 634
 635     // Lipo if necessary, We do it this way because we need to set the
 636     // arch flag so that -Xarch_ gets overwritten.
 637     if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
 638       Actions.append(Inputs.begin(), Inputs.end());
 639     else
 640       Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
 641   }
 642 }
 643
 644 void Driver::BuildActions(const ArgList &Args, ActionList &Actions) const {
 645   llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
 646   // Start by constructing the list of inputs and their types.
 647
 648   // Track the current user specified (-x) input. We also explicitly
 649   // track the argument used to set the type; we only want to claim
 650   // the type when we actually use it, so we warn about unused -x
 651   // arguments.
 652   types::ID InputType = types::TY_Nothing;
 653   Arg *InputTypeArg = 0;
 654
 655   llvm::SmallVector<std::pair<types::ID, const Arg*>, 16> Inputs;
 656   for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
 657        it != ie; ++it) {
 658     Arg *A = *it;
 659
 660     if (isa<InputOption>(A->getOption())) {
 661       const char *Value = A->getValue(Args);
 662       types::ID Ty = types::TY_INVALID;
 663
 664       // Infer the input type if necessary.
 665       if (InputType == types::TY_Nothing) {
 666         // If there was an explicit arg for this, claim it.
 667         if (InputTypeArg)
 668           InputTypeArg->claim();
 669
 670         // stdin must be handled specially.
 671         if (memcmp(Value, "-", 2) == 0) {
 672           // If running with -E, treat as a C input (this changes the
 673           // builtin macros, for example). This may be overridden by
 674           // -ObjC below.
 675           //
 676           // Otherwise emit an error but still use a valid type to
 677           // avoid spurious errors (e.g., no inputs).
 678           if (!Args.hasArg(options::OPT_E, false))
 679             Diag(clang::diag::err_drv_unknown_stdin_type);
 680           Ty = types::TY_C;
 681         } else {
 682           // Otherwise lookup by extension, and fallback to ObjectType
 683           // if not found. We use a host hook here because Darwin at
 684           // least has its own idea of what .s is.
 685           if (const char *Ext = strrchr(Value, '.'))
 686             Ty = Host->lookupTypeForExtension(Ext + 1);
 687
 688           if (Ty == types::TY_INVALID)
 689             Ty = types::TY_Object;
 690         }
 691
 692         // -ObjC and -ObjC++ override the default language, but only for "source
 693         // files". We just treat everything that isn't a linker input as a
 694         // source file.
 695         //
 696         // FIXME: Clean this up if we move the phase sequence into the type.
 697         if (Ty != types::TY_Object) {
 698           if (Args.hasArg(options::OPT_ObjC))
 699             Ty = types::TY_ObjC;
 700           else if (Args.hasArg(options::OPT_ObjCXX))
 701             Ty = types::TY_ObjCXX;
 702         }
 703       } else {
 704         assert(InputTypeArg && "InputType set w/o InputTypeArg");
 705         InputTypeArg->claim();
 706         Ty = InputType;
 707       }
 708
 709       // Check that the file exists. It isn't clear this is worth
 710       // doing, since the tool presumably does this anyway, and this
 711       // just adds an extra stat to the equation, but this is gcc
 712       // compatible.
 713       if (memcmp(Value, "-", 2) != 0 && !llvm::sys::Path(Value).exists())
 714         Diag(clang::diag::err_drv_no_such_file) << A->getValue(Args);
 715       else
 716         Inputs.push_back(std::make_pair(Ty, A));
 717
 718     } else if (A->getOption().isLinkerInput()) {
 719       // Just treat as object type, we could make a special type for
 720       // this if necessary.
 721       Inputs.push_back(std::make_pair(types::TY_Object, A));
 722
 723     } else if (A->getOption().getId() == options::OPT_x) {
 724       InputTypeArg = A;
 725       InputType = types::lookupTypeForTypeSpecifier(A->getValue(Args));
 726
 727       // Follow gcc behavior and treat as linker input for invalid -x
 728       // options. Its not clear why we shouldn't just revert to
 729       // unknown; but this isn't very important, we might as well be
 730       // bug comatible.
 731       if (!InputType) {
 732         Diag(clang::diag::err_drv_unknown_language) << A->getValue(Args);
 733         InputType = types::TY_Object;
 734       }
 735     }
 736   }
 737
 738   if (!SuppressMissingInputWarning && Inputs.empty()) {
 739     Diag(clang::diag::err_drv_no_input_files);
 740     return;
 741   }
 742
 743   // Determine which compilation mode we are in. We look for options
 744   // which affect the phase, starting with the earliest phases, and
 745   // record which option we used to determine the final phase.
 746   Arg *FinalPhaseArg = 0;
 747   phases::ID FinalPhase;
 748
 749   // -{E,M,MM} only run the preprocessor.
 750   if ((FinalPhaseArg = Args.getLastArg(options::OPT_E)) ||
 751       (FinalPhaseArg = Args.getLastArg(options::OPT_M)) ||
 752       (FinalPhaseArg = Args.getLastArg(options::OPT_MM))) {
 753     FinalPhase = phases::Preprocess;
 754
 755     // -{fsyntax-only,-analyze,emit-llvm,S} only run up to the compiler.
 756   } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_fsyntax_only)) ||
 757              (FinalPhaseArg = Args.getLastArg(options::OPT__analyze,
 758                                               options::OPT__analyze_auto)) ||
 759              (FinalPhaseArg = Args.getLastArg(options::OPT_S))) {
 760     FinalPhase = phases::Compile;
 761
 762     // -c only runs up to the assembler.
 763   } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_c))) {
 764     FinalPhase = phases::Assemble;
 765
 766     // Otherwise do everything.
 767   } else
 768     FinalPhase = phases::Link;
 769
 770   // Reject -Z* at the top level, these options should never have been
 771   // exposed by gcc.
 772   if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
 773     Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
 774
 775   // Construct the actions to perform.
 776   ActionList LinkerInputs;
 777   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
 778     types::ID InputType = Inputs[i].first;
 779     const Arg *InputArg = Inputs[i].second;
 780
 781     unsigned NumSteps = types::getNumCompilationPhases(InputType);
 782     assert(NumSteps && "Invalid number of steps!");
 783
 784     // If the first step comes after the final phase we are doing as
 785     // part of this compilation, warn the user about it.
 786     phases::ID InitialPhase = types::getCompilationPhase(InputType, 0);
 787     if (InitialPhase > FinalPhase) {
 788       // Claim here to avoid the more general unused warning.
 789       InputArg->claim();
 790       Diag(clang::diag::warn_drv_input_file_unused)
 791         << InputArg->getAsString(Args)
 792         << getPhaseName(InitialPhase)
 793         << FinalPhaseArg->getOption().getName();
 794       continue;
 795     }
 796
 797     // Build the pipeline for this file.
 798     Action *Current = new InputAction(*InputArg, InputType);
 799     for (unsigned i = 0; i != NumSteps; ++i) {
 800       phases::ID Phase = types::getCompilationPhase(InputType, i);
 801
 802       // We are done if this step is past what the user requested.
 803       if (Phase > FinalPhase)
 804         break;
 805
 806       // Queue linker inputs.
 807       if (Phase == phases::Link) {
 808         assert(i + 1 == NumSteps && "linking must be final compilation step.");
 809         LinkerInputs.push_back(Current);
 810         Current = 0;
 811         break;
 812       }
 813
 814       // Some types skip the assembler phase (e.g., llvm-bc), but we
 815       // can't encode this in the steps because the intermediate type
 816       // depends on arguments. Just special case here.
 817       if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
 818         continue;
 819
 820       // Otherwise construct the appropriate action.
 821       Current = ConstructPhaseAction(Args, Phase, Current);
 822       if (Current->getType() == types::TY_Nothing)
 823         break;
 824     }
 825
 826     // If we ended with something, add to the output list.
 827     if (Current)
 828       Actions.push_back(Current);
 829   }
 830
 831   // Add a link action if necessary.
 832   if (!LinkerInputs.empty())
 833     Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
 834 }
 835
 836 Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
 837                                      Action *Input) const {
 838   llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
 839   // Build the appropriate action.
 840   switch (Phase) {
 841   case phases::Link: assert(0 && "link action invalid here.");
 842   case phases::Preprocess: {
 843     types::ID OutputTy;
 844     // -{M, MM} alter the output type.
 845     if (Args.hasArg(options::OPT_M) || Args.hasArg(options::OPT_MM)) {
 846       OutputTy = types::TY_Dependencies;
 847     } else {
 848       OutputTy = types::getPreprocessedType(Input->getType());
 849       assert(OutputTy != types::TY_INVALID &&
 850              "Cannot preprocess this input type!");
 851     }
 852     return new PreprocessJobAction(Input, OutputTy);
 853   }
 854   case phases::Precompile:
 855     return new PrecompileJobAction(Input, types::TY_PCH);
 856   case phases::Compile: {
 857     if (Args.hasArg(options::OPT_fsyntax_only)) {
 858       return new CompileJobAction(Input, types::TY_Nothing);
 859     } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
 860       return new AnalyzeJobAction(Input, types::TY_Plist);
 861     } else if (Args.hasArg(options::OPT_emit_llvm) ||
 862                Args.hasArg(options::OPT_flto) ||
 863                Args.hasArg(options::OPT_O4)) {
 864       types::ID Output =
 865         Args.hasArg(options::OPT_S) ? types::TY_LLVMAsm : types::TY_LLVMBC;
 866       return new CompileJobAction(Input, Output);
 867     } else {
 868       return new CompileJobAction(Input, types::TY_PP_Asm);
 869     }
 870   }
 871   case phases::Assemble:
 872     return new AssembleJobAction(Input, types::TY_Object);
 873   }
 874
 875   assert(0 && "invalid phase in ConstructPhaseAction");
 876   return 0;
 877 }
 878
 879 void Driver::BuildJobs(Compilation &C) const {
 880   llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
 881   bool SaveTemps = C.getArgs().hasArg(options::OPT_save_temps);
 882   bool UsePipes = C.getArgs().hasArg(options::OPT_pipe);
 883
 884   // FIXME: Pipes are forcibly disabled until we support executing
 885   // them.
 886   if (!CCCPrintBindings)
 887     UsePipes = false;
 888
 889   // -save-temps inhibits pipes.
 890   if (SaveTemps && UsePipes) {
 891     Diag(clang::diag::warn_drv_pipe_ignored_with_save_temps);
 892     UsePipes = true;
 893   }
 894
 895   Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
 896
 897   // It is an error to provide a -o option if we are making multiple
 898   // output files.
 899   if (FinalOutput) {
 900     unsigned NumOutputs = 0;
 901     for (ActionList::const_iterator it = C.getActions().begin(),
 902            ie = C.getActions().end(); it != ie; ++it)
 903       if ((*it)->getType() != types::TY_Nothing)
 904         ++NumOutputs;
 905
 906     if (NumOutputs > 1) {
 907       Diag(clang::diag::err_drv_output_argument_with_multiple_files);
 908       FinalOutput = 0;
 909     }
 910   }
 911
 912   for (ActionList::const_iterator it = C.getActions().begin(),
 913          ie = C.getActions().end(); it != ie; ++it) {
 914     Action *A = *it;
 915
 916     // If we are linking an image for multiple archs then the linker
 917     // wants -arch_multiple and -final_output <final image
 918     // name>. Unfortunately, this doesn't fit in cleanly because we
 919     // have to pass this information down.
 920     //
 921     // FIXME: This is a hack; find a cleaner way to integrate this
 922     // into the process.
 923     const char *LinkingOutput = 0;
 924     if (isa<LipoJobAction>(A)) {
 925       if (FinalOutput)
 926         LinkingOutput = FinalOutput->getValue(C.getArgs());
 927       else
 928         LinkingOutput = DefaultImageName.c_str();
 929     }
 930
 931     InputInfo II;
 932     BuildJobsForAction(C, A, &C.getDefaultToolChain(),
 933                        /*CanAcceptPipe*/ true,
 934                        /*AtTopLevel*/ true,
 935                        /*LinkingOutput*/ LinkingOutput,
 936                        II);
 937   }
 938
 939   // If the user passed -Qunused-arguments or there were errors, don't
 940   // warn about any unused arguments.
 941   if (Diags.getNumErrors() ||
 942       C.getArgs().hasArg(options::OPT_Qunused_arguments))
 943     return;
 944
 945   // Claim -### here.
 946   (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
 947
 948   for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
 949        it != ie; ++it) {
 950     Arg *A = *it;
 951
 952     // FIXME: It would be nice to be able to send the argument to the
 953     // Diagnostic, so that extra values, position, and so on could be
 954     // printed.
 955     if (!A->isClaimed()) {
 956       if (A->getOption().hasNoArgumentUnused())
 957         continue;
 958
 959       // Suppress the warning automatically if this is just a flag,
 960       // and it is an instance of an argument we already claimed.
 961       const Option &Opt = A->getOption();
 962       if (isa<FlagOption>(Opt)) {
 963         bool DuplicateClaimed = false;
 964
 965         // FIXME: Use iterator.
 966         for (ArgList::const_iterator it = C.getArgs().begin(),
 967                ie = C.getArgs().end(); it != ie; ++it) {
 968           if ((*it)->isClaimed() && (*it)->getOption().matches(Opt.getId())) {
 969             DuplicateClaimed = true;
 970             break;
 971           }
 972         }
 973
 974         if (DuplicateClaimed)
 975           continue;
 976       }
 977
 978       Diag(clang::diag::warn_drv_unused_argument)
 979         << A->getAsString(C.getArgs());
 980     }
 981   }
 982 }
 983
 984 void Driver::BuildJobsForAction(Compilation &C,
 985                                 const Action *A,
 986                                 const ToolChain *TC,
 987                                 bool CanAcceptPipe,
 988                                 bool AtTopLevel,
 989                                 const char *LinkingOutput,
 990                                 InputInfo &Result) const {
 991   llvm::PrettyStackTraceString CrashInfo("Building compilation jobs for action");
 992
 993   bool UsePipes = C.getArgs().hasArg(options::OPT_pipe);
 994   // FIXME: Pipes are forcibly disabled until we support executing
 995   // them.
 996   if (!CCCPrintBindings)
 997     UsePipes = false;
 998
 999   if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1000     // FIXME: It would be nice to not claim this here; maybe the old
1001     // scheme of just using Args was better?
1002     const Arg &Input = IA->getInputArg();
1003     Input.claim();
1004     if (isa<PositionalArg>(Input)) {
1005       const char *Name = Input.getValue(C.getArgs());
1006       Result = InputInfo(Name, A->getType(), Name);
1007     } else
1008       Result = InputInfo(&Input, A->getType(), "");
1009     return;
1010   }
1011
1012   if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1013     const char *ArchName = BAA->getArchName();
1014     std::string Arch;
1015     if (!ArchName) {
1016       Arch = C.getDefaultToolChain().getArchName();
1017       ArchName = Arch.c_str();
1018     }
1019     BuildJobsForAction(C,
1020                        *BAA->begin(),
1021                        Host->getToolChain(C.getArgs(), ArchName),
1022                        CanAcceptPipe,
1023                        AtTopLevel,
1024                        LinkingOutput,
1025                        Result);
1026     return;
1027   }
1028
1029   const JobAction *JA = cast<JobAction>(A);
1030   const Tool &T = TC->SelectTool(C, *JA);
1031
1032   // See if we should use an integrated preprocessor. We do so when we
1033   // have exactly one input, since this is the only use case we care
1034   // about (irrelevant since we don't support combine yet).
1035   bool UseIntegratedCPP = false;
1036   const ActionList *Inputs = &A->getInputs();
1037   if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin())) {
1038     if (!C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1039         !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1040         !C.getArgs().hasArg(options::OPT_save_temps) &&
1041         T.hasIntegratedCPP()) {
1042       UseIntegratedCPP = true;
1043       Inputs = &(*Inputs)[0]->getInputs();
1044     }
1045   }
1046
1047   // Only use pipes when there is exactly one input.
1048   bool TryToUsePipeInput = Inputs->size() == 1 && T.acceptsPipedInput();
1049   InputInfoList InputInfos;
1050   for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1051        it != ie; ++it) {
1052     InputInfo II;
1053     BuildJobsForAction(C, *it, TC, TryToUsePipeInput,
1054                        /*AtTopLevel*/false,
1055                        LinkingOutput,
1056                        II);
1057     InputInfos.push_back(II);
1058   }
1059
1060   // Determine if we should output to a pipe.
1061   bool OutputToPipe = false;
1062   if (CanAcceptPipe && T.canPipeOutput()) {
1063     // Some actions default to writing to a pipe if they are the top
1064     // level phase and there was no user override.
1065     //
1066     // FIXME: Is there a better way to handle this?
1067     if (AtTopLevel) {
1068       if (isa<PreprocessJobAction>(A) && !C.getArgs().hasArg(options::OPT_o))
1069         OutputToPipe = true;
1070     } else if (UsePipes)
1071       OutputToPipe = true;
1072   }
1073
1074   // Figure out where to put the job (pipes).
1075   Job *Dest = &C.getJobs();
1076   if (InputInfos[0].isPipe()) {
1077     assert(TryToUsePipeInput && "Unrequested pipe!");
1078     assert(InputInfos.size() == 1 && "Unexpected pipe with multiple inputs.");
1079     Dest = &InputInfos[0].getPipe();
1080   }
1081
1082   // Always use the first input as the base input.
1083   const char *BaseInput = InputInfos[0].getBaseInput();
1084
1085   // Determine the place to write output to (nothing, pipe, or
1086   // filename) and where to put the new job.
1087   if (JA->getType() == types::TY_Nothing) {
1088     Result = InputInfo(A->getType(), BaseInput);
1089   } else if (OutputToPipe) {
1090     // Append to current piped job or create a new one as appropriate.
1091     PipedJob *PJ = dyn_cast<PipedJob>(Dest);
1092     if (!PJ) {
1093       PJ = new PipedJob();
1094       // FIXME: Temporary hack so that -ccc-print-bindings work until
1095       // we have pipe support. Please remove later.
1096       if (!CCCPrintBindings)
1097         cast<JobList>(Dest)->addJob(PJ);
1098       Dest = PJ;
1099     }
1100     Result = InputInfo(PJ, A->getType(), BaseInput);
1101   } else {
1102     Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, AtTopLevel),
1103                        A->getType(), BaseInput);
1104   }
1105
1106   if (CCCPrintBindings) {
1107     llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
1108                  << " - \"" << T.getName() << "\", inputs: [";
1109     for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1110       llvm::errs() << InputInfos[i].getAsString();
1111       if (i + 1 != e)
1112         llvm::errs() << ", ";
1113     }
1114     llvm::errs() << "], output: " << Result.getAsString() << "\n";
1115   } else {
1116     T.ConstructJob(C, *JA, *Dest, Result, InputInfos,
1117                    C.getArgsForToolChain(TC), LinkingOutput);
1118   }
1119 }
1120
1121 const char *Driver::GetNamedOutputPath(Compilation &C,
1122                                        const JobAction &JA,
1123                                        const char *BaseInput,
1124                                        bool AtTopLevel) const {
1125   llvm::PrettyStackTraceString CrashInfo("Computing output path");
1126   // Output to a user requested destination?
1127   if (AtTopLevel) {
1128     if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1129       return C.addResultFile(FinalOutput->getValue(C.getArgs()));
1130   }
1131
1132   // Output to a temporary file?
1133   if (!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) {
1134     std::string TmpName =
1135       GetTemporaryPath(types::getTypeTempSuffix(JA.getType()));
1136     return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1137   }
1138
1139   llvm::sys::Path BasePath(BaseInput);
1140   std::string BaseName(BasePath.getLast());
1141
1142   // Determine what the derived output name should be.
1143   const char *NamedOutput;
1144   if (JA.getType() == types::TY_Image) {
1145     NamedOutput = DefaultImageName.c_str();
1146   } else {
1147     const char *Suffix = types::getTypeTempSuffix(JA.getType());
1148     assert(Suffix && "All types used for output should have a suffix.");
1149
1150     std::string::size_type End = std::string::npos;
1151     if (!types::appendSuffixForType(JA.getType()))
1152       End = BaseName.rfind('.');
1153     std::string Suffixed(BaseName.substr(0, End));
1154     Suffixed += '.';
1155     Suffixed += Suffix;
1156     NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1157   }
1158
1159   // As an annoying special case, PCH generation doesn't strip the
1160   // pathname.
1161   if (JA.getType() == types::TY_PCH) {
1162     BasePath.eraseComponent();
1163     if (BasePath.isEmpty())
1164       BasePath = NamedOutput;
1165     else
1166       BasePath.appendComponent(NamedOutput);
1167     return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()));
1168   } else {
1169     return C.addResultFile(NamedOutput);
1170   }
1171 }
1172
1173 llvm::sys::Path Driver::GetFilePath(const char *Name,
1174                                     const ToolChain &TC) const {
1175   const ToolChain::path_list &List = TC.getFilePaths();
1176   for (ToolChain::path_list::const_iterator
1177          it = List.begin(), ie = List.end(); it != ie; ++it) {
1178     llvm::sys::Path P(*it);
1179     P.appendComponent(Name);
1180     if (P.exists())
1181       return P;
1182   }
1183
1184   return llvm::sys::Path(Name);
1185 }
1186
1187 llvm::sys::Path Driver::GetProgramPath(const char *Name,
1188                                        const ToolChain &TC,
1189                                        bool WantFile) const {
1190   const ToolChain::path_list &List = TC.getProgramPaths();
1191   for (ToolChain::path_list::const_iterator
1192          it = List.begin(), ie = List.end(); it != ie; ++it) {
1193     llvm::sys::Path P(*it);
1194     P.appendComponent(Name);
1195     if (WantFile ? P.exists() : P.canExecute())
1196       return P;
1197   }
1198
1199   // If all else failed, search the path.
1200   llvm::sys::Path P(llvm::sys::Program::FindProgramByName(Name));
1201   if (!P.empty())
1202     return P;
1203
1204   return llvm::sys::Path(Name);
1205 }
1206
1207 std::string Driver::GetTemporaryPath(const char *Suffix) const {
1208   // FIXME: This is lame; sys::Path should provide this function (in
1209   // particular, it should know how to find the temporary files dir).
1210   std::string Error;
1211   const char *TmpDir = ::getenv("TMPDIR");
1212   if (!TmpDir)
1213     TmpDir = ::getenv("TEMP");
1214   if (!TmpDir)
1215     TmpDir = ::getenv("TMP");
1216   if (!TmpDir)
1217     TmpDir = "/tmp";
1218   llvm::sys::Path P(TmpDir);
1219   P.appendComponent("cc");
1220   if (P.makeUnique(false, &Error)) {
1221     Diag(clang::diag::err_drv_unable_to_make_temp) << Error;
1222     return "";
1223   }
1224
1225   // FIXME: Grumble, makeUnique sometimes leaves the file around!?
1226   // PR3837.
1227   P.eraseFromDisk(false, 0);
1228
1229   P.appendSuffix(Suffix);
1230   return P.toString();
1231 }
1232
1233 const HostInfo *Driver::GetHostInfo(const char *TripleStr) const {
1234   llvm::PrettyStackTraceString CrashInfo("Constructing host");
1235   llvm::Triple Triple(TripleStr);
1236
1237   // Normalize Arch a bit.
1238   //
1239   // FIXME: We shouldn't need to do this once everything goes through the triple
1240   // interface.
1241   if (Triple.getArchName() == "i686")
1242     Triple.setArchName("i386");
1243   else if (Triple.getArchName() == "amd64")
1244     Triple.setArchName("x86_64");
1245   else if (Triple.getArchName() == "ppc" ||
1246            Triple.getArchName() == "Power Macintosh")
1247     Triple.setArchName("powerpc");
1248   else if (Triple.getArchName() == "ppc64")
1249     Triple.setArchName("powerpc64");
1250
1251   switch (Triple.getOS()) {
1252   case llvm::Triple::Darwin:
1253     return createDarwinHostInfo(*this, Triple);
1254   case llvm::Triple::DragonFly:
1255     return createDragonFlyHostInfo(*this, Triple);
1256   case llvm::Triple::OpenBSD:
1257     return createOpenBSDHostInfo(*this, Triple);
1258   case llvm::Triple::FreeBSD:
1259     return createFreeBSDHostInfo(*this, Triple);
1260   case llvm::Triple::Linux:
1261     return createLinuxHostInfo(*this, Triple);
1262   default:
1263     return createUnknownHostInfo(*this, Triple);
1264   }
1265 }
1266
1267 bool Driver::ShouldUseClangCompiler(const Compilation &C, const JobAction &JA,
1268                                     const std::string &ArchNameStr) const {
1269   // FIXME: Remove this hack.
1270   const char *ArchName = ArchNameStr.c_str();
1271   if (ArchNameStr == "powerpc")
1272     ArchName = "ppc";
1273   else if (ArchNameStr == "powerpc64")
1274     ArchName = "ppc64";
1275
1276   // Check if user requested no clang, or clang doesn't understand
1277   // this type (we only handle single inputs for now).
1278   if (!CCCUseClang || JA.size() != 1 ||
1279       !types::isAcceptedByClang((*JA.begin())->getType()))
1280     return false;
1281
1282   // Otherwise make sure this is an action clang understands.
1283   if (isa<PreprocessJobAction>(JA)) {
1284     if (!CCCUseClangCPP) {
1285       Diag(clang::diag::warn_drv_not_using_clang_cpp);
1286       return false;
1287     }
1288   } else if (!isa<PrecompileJobAction>(JA) && !isa<CompileJobAction>(JA))
1289     return false;
1290
1291   // Use clang for C++?
1292   if (!CCCUseClangCXX && types::isCXX((*JA.begin())->getType())) {
1293     Diag(clang::diag::warn_drv_not_using_clang_cxx);
1294     return false;
1295   }
1296
1297   // Always use clang for precompiling, regardless of archs. PTH is
1298   // platform independent, and this allows the use of the static
1299   // analyzer on platforms we don't have full IRgen support for.
1300   if (isa<PrecompileJobAction>(JA))
1301     return true;
1302
1303   // Finally, don't use clang if this isn't one of the user specified
1304   // archs to build.
1305   if (!CCCClangArchs.empty() && !CCCClangArchs.count(ArchName)) {
1306     Diag(clang::diag::warn_drv_not_using_clang_arch) << ArchName;
1307     return false;
1308   }
1309
1310   return true;
1311 }
1312
1313 /// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and
1314 /// return the grouped values as integers. Numbers which are not
1315 /// provided are set to 0.
1316 ///
1317 /// \return True if the entire string was parsed (9.2), or all groups
1318 /// were parsed (10.3.5extrastuff).
1319 bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1320                                unsigned &Minor, unsigned &Micro,
1321                                bool &HadExtra) {
1322   HadExtra = false;
1323
1324   Major = Minor = Micro = 0;
1325   if (*Str == '\0')
1326     return true;
1327
1328   char *End;
1329   Major = (unsigned) strtol(Str, &End, 10);
1330   if (*Str != '\0' && *End == '\0')
1331     return true;
1332   if (*End != '.')
1333     return false;
1334
1335   Str = End+1;
1336   Minor = (unsigned) strtol(Str, &End, 10);
1337   if (*Str != '\0' && *End == '\0')
1338     return true;
1339   if (*End != '.')
1340     return false;
1341
1342   Str = End+1;
1343   Micro = (unsigned) strtol(Str, &End, 10);
1344   if (*Str != '\0' && *End == '\0')
1345     return true;
1346   if (Str == End)
1347     return false;
1348   HadExtra = true;
1349   return true;
1350 }