Driver.cpp revision e5a37f48388c7e4cc081f44d13a4910bfa56cd35 
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/OptTable.h"
20#include "clang/Driver/Option.h"
21#include "clang/Driver/Options.h"
22#include "clang/Driver/Tool.h"
23#include "clang/Driver/ToolChain.h"
24#include "clang/Driver/Types.h"
25
26#include "clang/Basic/Version.h"
27
28#include "llvm/Config/config.h"
29#include "llvm/ADT/StringSet.h"
30#include "llvm/ADT/OwningPtr.h"
31#include "llvm/Support/PrettyStackTrace.h"
32#include "llvm/Support/raw_ostream.h"
33#include "llvm/System/Path.h"
34#include "llvm/System/Program.h"
35
36#include "InputInfo.h"
37
38#include <map>
39
40using namespace clang::driver;
41using namespace clang;
42
43Driver::Driver(llvm::StringRef _ClangExecutable,
44               llvm::StringRef _DefaultHostTriple,
45               llvm::StringRef _DefaultImageName,
46               bool IsProduction, bool CXXIsProduction,
47               Diagnostic &_Diags)
48  : Opts(createDriverOptTable()), Diags(_Diags),
49    ClangExecutable(_ClangExecutable), DefaultHostTriple(_DefaultHostTriple),
50    DefaultImageName(_DefaultImageName),
51    DriverTitle("clang \"gcc-compatible\" driver"),
52    Host(0),
53    CCPrintOptionsFilename(0), CCCIsCXX(false),
54    CCCEcho(false), CCCPrintBindings(false), CCPrintOptions(false), CCCGenericGCCName("gcc"),
55    CheckInputsExist(true), CCCUseClang(true), CCCUseClangCXX(true),
56    CCCUseClangCPP(true), CCCUsePCH(true), SuppressMissingInputWarning(false) {
57  if (IsProduction) {
58    // In a "production" build, only use clang on architectures we expect to
59    // work, and don't use clang C++.
60    //
61    // During development its more convenient to always have the driver use
62    // clang, but we don't want users to be confused when things don't work, or
63    // to file bugs for things we don't support.
64    CCCClangArchs.insert(llvm::Triple::x86);
65    CCCClangArchs.insert(llvm::Triple::x86_64);
66    CCCClangArchs.insert(llvm::Triple::arm);
67
68    if (!CXXIsProduction)
69      CCCUseClangCXX = false;
70  }
71
72  llvm::sys::Path Executable(ClangExecutable);
73  Name = Executable.getBasename();
74  Dir = Executable.getDirname();
75
76  // Compute the path to the resource directory.
77  llvm::sys::Path P(Dir);
78  P.eraseComponent(); // Remove /bin from foo/bin
79  P.appendComponent("lib");
80  P.appendComponent("clang");
81  P.appendComponent(CLANG_VERSION_STRING);
82  ResourceDir = P.str();
83}
84
85Driver::~Driver() {
86  delete Opts;
87  delete Host;
88}
89
90InputArgList *Driver::ParseArgStrings(const char **ArgBegin,
91                                      const char **ArgEnd) {
92  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
93  unsigned MissingArgIndex, MissingArgCount;
94  InputArgList *Args = getOpts().ParseArgs(ArgBegin, ArgEnd,
95                                           MissingArgIndex, MissingArgCount);
96
97  // Check for missing argument error.
98  if (MissingArgCount)
99    Diag(clang::diag::err_drv_missing_argument)
100      << Args->getArgString(MissingArgIndex) << MissingArgCount;
101
102  // Check for unsupported options.
103  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
104       it != ie; ++it) {
105    Arg *A = *it;
106    if (A->getOption().isUnsupported()) {
107      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
108      continue;
109    }
110  }
111
112  return Args;
113}
114
115DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
116  DerivedArgList *DAL = new DerivedArgList(Args);
117
118  bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
119  for (ArgList::const_iterator it = Args.begin(),
120         ie = Args.end(); it != ie; ++it) {
121    const Arg *A = *it;
122
123    // Unfortunately, we have to parse some forwarding options (-Xassembler,
124    // -Xlinker, -Xpreprocessor) because we either integrate their functionality
125    // (assembler and preprocessor), or bypass a previous driver ('collect2').
126
127    // Rewrite linker options, to replace --no-demangle with a custom internal
128    // option.
129    if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
130         A->getOption().matches(options::OPT_Xlinker)) &&
131        A->containsValue("--no-demangle")) {
132      // Add the rewritten no-demangle argument.
133      DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_Xlinker__no_demangle));
134
135      // Add the remaining values as Xlinker arguments.
136      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
137        if (llvm::StringRef(A->getValue(Args, i)) != "--no-demangle")
138          DAL->AddSeparateArg(A, Opts->getOption(options::OPT_Xlinker),
139                              A->getValue(Args, i));
140
141      continue;
142    }
143
144    // Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
145    // some build systems. We don't try to be complete here because we don't
146    // care to encourage this usage model.
147    if (A->getOption().matches(options::OPT_Wp_COMMA) &&
148        A->getNumValues() == 2 &&
149        (A->getValue(Args, 0) == llvm::StringRef("-MD") ||
150         A->getValue(Args, 0) == llvm::StringRef("-MMD"))) {
151      // Rewrite to -MD/-MMD along with -MF.
152      if (A->getValue(Args, 0) == llvm::StringRef("-MD"))
153        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MD));
154      else
155        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MMD));
156      DAL->AddSeparateArg(A, Opts->getOption(options::OPT_MF),
157                          A->getValue(Args, 1));
158      continue;
159    }
160
161    // Rewrite reserved library names, unless -nostdlib is present.
162    if (!HasNostdlib && A->getOption().matches(options::OPT_l)) {
163      llvm::StringRef Value = A->getValue(Args);
164
165      if (Value == "stdc++") {
166        DAL->AddFlagArg(A, Opts->getOption(
167                              options::OPT_Z_reserved_lib_stdcxx));
168        continue;
169      }
170    }
171
172    DAL->append(*it);
173  }
174
175  // Add a default value of -mlinker-version=, if one was given and the user
176  // didn't specify one.
177#if defined(HOST_LINK_VERSION)
178  if (!Args.hasArg(options::OPT_mlinker_version_EQ)) {
179    DAL->AddJoinedArg(0, Opts->getOption(options::OPT_mlinker_version_EQ),
180                      HOST_LINK_VERSION);
181    DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
182  }
183#endif
184
185  return DAL;
186}
187
188Compilation *Driver::BuildCompilation(int argc, const char **argv) {
189  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
190
191  // FIXME: Handle environment options which effect driver behavior, somewhere
192  // (client?). GCC_EXEC_PREFIX, COMPILER_PATH, LIBRARY_PATH, LPATH,
193  // CC_PRINT_OPTIONS.
194
195  // FIXME: What are we going to do with -V and -b?
196
197  // FIXME: This stuff needs to go into the Compilation, not the driver.
198  bool CCCPrintOptions = false, CCCPrintActions = false;
199
200  const char **Start = argv + 1, **End = argv + argc;
201
202  InputArgList *Args = ParseArgStrings(Start, End);
203
204  // -no-canonical-prefixes is used very early in main.
205  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
206
207  // Ignore -pipe.
208  Args->ClaimAllArgs(options::OPT_pipe);
209
210  // Extract -ccc args.
211  //
212  // FIXME: We need to figure out where this behavior should live. Most of it
213  // should be outside in the client; the parts that aren't should have proper
214  // options, either by introducing new ones or by overloading gcc ones like -V
215  // or -b.
216  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
217  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
218  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
219  CCCIsCXX = Args->hasArg(options::OPT_ccc_cxx) || CCCIsCXX;
220  if (CCCIsCXX)
221    CCCGenericGCCName = "g++";
222  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
223  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
224    CCCGenericGCCName = A->getValue(*Args);
225  CCCUseClangCXX = Args->hasFlag(options::OPT_ccc_clang_cxx,
226                                 options::OPT_ccc_no_clang_cxx,
227                                 CCCUseClangCXX);
228  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
229                            options::OPT_ccc_pch_is_pth);
230  CCCUseClang = !Args->hasArg(options::OPT_ccc_no_clang);
231  CCCUseClangCPP = !Args->hasArg(options::OPT_ccc_no_clang_cpp);
232  if (const Arg *A = Args->getLastArg(options::OPT_ccc_clang_archs)) {
233    llvm::StringRef Cur = A->getValue(*Args);
234
235    CCCClangArchs.clear();
236    while (!Cur.empty()) {
237      std::pair<llvm::StringRef, llvm::StringRef> Split = Cur.split(',');
238
239      if (!Split.first.empty()) {
240        llvm::Triple::ArchType Arch =
241          llvm::Triple(Split.first, "", "").getArch();
242
243        if (Arch == llvm::Triple::UnknownArch)
244          Diag(clang::diag::err_drv_invalid_arch_name) << Split.first;
245
246        CCCClangArchs.insert(Arch);
247      }
248
249      Cur = Split.second;
250    }
251  }
252  // FIXME: We shouldn't overwrite the default host triple here, but we have
253  // nowhere else to put this currently.
254  if (const Arg *A = Args->getLastArg(options::OPT_ccc_host_triple))
255    DefaultHostTriple = A->getValue(*Args);
256  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
257    Dir = InstalledDir = A->getValue(*Args);
258  if (const Arg *A = Args->getLastArg(options::OPT_B))
259    PrefixDir = A->getValue(*Args);
260
261  Host = GetHostInfo(DefaultHostTriple.c_str());
262
263  // Perform the default argument translations.
264  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
265
266  // The compilation takes ownership of Args.
267  Compilation *C = new Compilation(*this, *Host->CreateToolChain(*Args), Args,
268                                   TranslatedArgs);
269
270  // FIXME: This behavior shouldn't be here.
271  if (CCCPrintOptions) {
272    PrintOptions(C->getInputArgs());
273    return C;
274  }
275
276  if (!HandleImmediateArgs(*C))
277    return C;
278
279  // Construct the list of abstract actions to perform for this compilation.
280  if (Host->useDriverDriver())
281    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
282                          C->getActions());
283  else
284    BuildActions(C->getDefaultToolChain(), C->getArgs(), C->getActions());
285
286  if (CCCPrintActions) {
287    PrintActions(*C);
288    return C;
289  }
290
291  BuildJobs(*C);
292
293  return C;
294}
295
296int Driver::ExecuteCompilation(const Compilation &C) const {
297  // Just print if -### was present.
298  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
299    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
300    return 0;
301  }
302
303  // If there were errors building the compilation, quit now.
304  if (getDiags().getNumErrors())
305    return 1;
306
307  const Command *FailingCommand = 0;
308  int Res = C.ExecuteJob(C.getJobs(), FailingCommand);
309
310  // Remove temp files.
311  C.CleanupFileList(C.getTempFiles());
312
313  // If the command succeeded, we are done.
314  if (Res == 0)
315    return Res;
316
317  // Otherwise, remove result files as well.
318  if (!C.getArgs().hasArg(options::OPT_save_temps))
319    C.CleanupFileList(C.getResultFiles(), true);
320
321  // Print extra information about abnormal failures, if possible.
322  //
323  // This is ad-hoc, but we don't want to be excessively noisy. If the result
324  // status was 1, assume the command failed normally. In particular, if it was
325  // the compiler then assume it gave a reasonable error code. Failures in other
326  // tools are less common, and they generally have worse diagnostics, so always
327  // print the diagnostic there.
328  const Tool &FailingTool = FailingCommand->getCreator();
329
330  if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
331    // FIXME: See FIXME above regarding result code interpretation.
332    if (Res < 0)
333      Diag(clang::diag::err_drv_command_signalled)
334        << FailingTool.getShortName() << -Res;
335    else
336      Diag(clang::diag::err_drv_command_failed)
337        << FailingTool.getShortName() << Res;
338  }
339
340  return Res;
341}
342
343void Driver::PrintOptions(const ArgList &Args) const {
344  unsigned i = 0;
345  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
346       it != ie; ++it, ++i) {
347    Arg *A = *it;
348    llvm::errs() << "Option " << i << " - "
349                 << "Name: \"" << A->getOption().getName() << "\", "
350                 << "Values: {";
351    for (unsigned j = 0; j < A->getNumValues(); ++j) {
352      if (j)
353        llvm::errs() << ", ";
354      llvm::errs() << '"' << A->getValue(Args, j) << '"';
355    }
356    llvm::errs() << "}\n";
357  }
358}
359
360void Driver::PrintHelp(bool ShowHidden) const {
361  getOpts().PrintHelp(llvm::outs(), Name.c_str(), DriverTitle.c_str(),
362                      ShowHidden);
363}
364
365void Driver::PrintVersion(const Compilation &C, llvm::raw_ostream &OS) const {
366  // FIXME: The following handlers should use a callback mechanism, we don't
367  // know what the client would like to do.
368  OS << getClangFullVersion() << '\n';
369  const ToolChain &TC = C.getDefaultToolChain();
370  OS << "Target: " << TC.getTripleString() << '\n';
371
372  // Print the threading model.
373  //
374  // FIXME: Implement correctly.
375  OS << "Thread model: " << "posix" << '\n';
376}
377
378/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
379/// option.
380static void PrintDiagnosticCategories(llvm::raw_ostream &OS) {
381  for (unsigned i = 1; // Skip the empty category.
382       const char *CategoryName = Diagnostic::getCategoryNameFromID(i); ++i)
383    OS << i << ',' << CategoryName << '\n';
384}
385
386bool Driver::HandleImmediateArgs(const Compilation &C) {
387  // The order these options are handled in gcc is all over the place, but we
388  // don't expect inconsistencies w.r.t. that to matter in practice.
389
390  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
391    llvm::outs() << CLANG_VERSION_STRING "\n";
392    return false;
393  }
394
395  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
396    PrintDiagnosticCategories(llvm::outs());
397    return false;
398  }
399
400  if (C.getArgs().hasArg(options::OPT__help) ||
401      C.getArgs().hasArg(options::OPT__help_hidden)) {
402    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
403    return false;
404  }
405
406  if (C.getArgs().hasArg(options::OPT__version)) {
407    // Follow gcc behavior and use stdout for --version and stderr for -v.
408    PrintVersion(C, llvm::outs());
409    return false;
410  }
411
412  if (C.getArgs().hasArg(options::OPT_v) ||
413      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
414    PrintVersion(C, llvm::errs());
415    SuppressMissingInputWarning = true;
416  }
417
418  const ToolChain &TC = C.getDefaultToolChain();
419  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
420    llvm::outs() << "programs: =";
421    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
422           ie = TC.getProgramPaths().end(); it != ie; ++it) {
423      if (it != TC.getProgramPaths().begin())
424        llvm::outs() << ':';
425      llvm::outs() << *it;
426    }
427    llvm::outs() << "\n";
428    llvm::outs() << "libraries: =";
429    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
430           ie = TC.getFilePaths().end(); it != ie; ++it) {
431      if (it != TC.getFilePaths().begin())
432        llvm::outs() << ':';
433      llvm::outs() << *it;
434    }
435    llvm::outs() << "\n";
436    return false;
437  }
438
439  // FIXME: The following handlers should use a callback mechanism, we don't
440  // know what the client would like to do.
441  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
442    llvm::outs() << GetFilePath(A->getValue(C.getArgs()), TC) << "\n";
443    return false;
444  }
445
446  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
447    llvm::outs() << GetProgramPath(A->getValue(C.getArgs()), TC) << "\n";
448    return false;
449  }
450
451  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
452    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
453    return false;
454  }
455
456  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
457    // FIXME: We need tool chain support for this.
458    llvm::outs() << ".;\n";
459
460    switch (C.getDefaultToolChain().getTriple().getArch()) {
461    default:
462      break;
463
464    case llvm::Triple::x86_64:
465      llvm::outs() << "x86_64;@m64" << "\n";
466      break;
467
468    case llvm::Triple::ppc64:
469      llvm::outs() << "ppc64;@m64" << "\n";
470      break;
471    }
472    return false;
473  }
474
475  // FIXME: What is the difference between print-multi-directory and
476  // print-multi-os-directory?
477  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
478      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
479    switch (C.getDefaultToolChain().getTriple().getArch()) {
480    default:
481    case llvm::Triple::x86:
482    case llvm::Triple::ppc:
483      llvm::outs() << "." << "\n";
484      break;
485
486    case llvm::Triple::x86_64:
487      llvm::outs() << "x86_64" << "\n";
488      break;
489
490    case llvm::Triple::ppc64:
491      llvm::outs() << "ppc64" << "\n";
492      break;
493    }
494    return false;
495  }
496
497  return true;
498}
499
500static unsigned PrintActions1(const Compilation &C, Action *A,
501                              std::map<Action*, unsigned> &Ids) {
502  if (Ids.count(A))
503    return Ids[A];
504
505  std::string str;
506  llvm::raw_string_ostream os(str);
507
508  os << Action::getClassName(A->getKind()) << ", ";
509  if (InputAction *IA = dyn_cast<InputAction>(A)) {
510    os << "\"" << IA->getInputArg().getValue(C.getArgs()) << "\"";
511  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
512    os << '"' << (BIA->getArchName() ? BIA->getArchName() :
513                  C.getDefaultToolChain().getArchName()) << '"'
514       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
515  } else {
516    os << "{";
517    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
518      os << PrintActions1(C, *it, Ids);
519      ++it;
520      if (it != ie)
521        os << ", ";
522    }
523    os << "}";
524  }
525
526  unsigned Id = Ids.size();
527  Ids[A] = Id;
528  llvm::errs() << Id << ": " << os.str() << ", "
529               << types::getTypeName(A->getType()) << "\n";
530
531  return Id;
532}
533
534void Driver::PrintActions(const Compilation &C) const {
535  std::map<Action*, unsigned> Ids;
536  for (ActionList::const_iterator it = C.getActions().begin(),
537         ie = C.getActions().end(); it != ie; ++it)
538    PrintActions1(C, *it, Ids);
539}
540
541/// \brief Check whether the given input tree contains any compilation (or
542/// assembly) actions.
543static bool ContainsCompileAction(const Action *A) {
544  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
545    return true;
546
547  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
548    if (ContainsCompileAction(*it))
549      return true;
550
551  return false;
552}
553
554void Driver::BuildUniversalActions(const ToolChain &TC,
555                                   const ArgList &Args,
556                                   ActionList &Actions) const {
557  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
558  // Collect the list of architectures. Duplicates are allowed, but should only
559  // be handled once (in the order seen).
560  llvm::StringSet<> ArchNames;
561  llvm::SmallVector<const char *, 4> Archs;
562  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
563       it != ie; ++it) {
564    Arg *A = *it;
565
566    if (A->getOption().matches(options::OPT_arch)) {
567      // Validate the option here; we don't save the type here because its
568      // particular spelling may participate in other driver choices.
569      llvm::Triple::ArchType Arch =
570        llvm::Triple::getArchTypeForDarwinArchName(A->getValue(Args));
571      if (Arch == llvm::Triple::UnknownArch) {
572        Diag(clang::diag::err_drv_invalid_arch_name)
573          << A->getAsString(Args);
574        continue;
575      }
576
577      A->claim();
578      if (ArchNames.insert(A->getValue(Args)))
579        Archs.push_back(A->getValue(Args));
580    }
581  }
582
583  // When there is no explicit arch for this platform, make sure we still bind
584  // the architecture (to the default) so that -Xarch_ is handled correctly.
585  if (!Archs.size())
586    Archs.push_back(0);
587
588  // FIXME: We killed off some others but these aren't yet detected in a
589  // functional manner. If we added information to jobs about which "auxiliary"
590  // files they wrote then we could detect the conflict these cause downstream.
591  if (Archs.size() > 1) {
592    // No recovery needed, the point of this is just to prevent
593    // overwriting the same files.
594    if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
595      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
596        << A->getAsString(Args);
597  }
598
599  ActionList SingleActions;
600  BuildActions(TC, Args, SingleActions);
601
602  // Add in arch bindings for every top level action, as well as lipo and
603  // dsymutil steps if needed.
604  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
605    Action *Act = SingleActions[i];
606
607    // Make sure we can lipo this kind of output. If not (and it is an actual
608    // output) then we disallow, since we can't create an output file with the
609    // right name without overwriting it. We could remove this oddity by just
610    // changing the output names to include the arch, which would also fix
611    // -save-temps. Compatibility wins for now.
612
613    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
614      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
615        << types::getTypeName(Act->getType());
616
617    ActionList Inputs;
618    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
619      Inputs.push_back(new BindArchAction(Act, Archs[i]));
620      if (i != 0)
621        Inputs.back()->setOwnsInputs(false);
622    }
623
624    // Lipo if necessary, we do it this way because we need to set the arch flag
625    // so that -Xarch_ gets overwritten.
626    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
627      Actions.append(Inputs.begin(), Inputs.end());
628    else
629      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
630
631    // Add a 'dsymutil' step if necessary, when debug info is enabled and we
632    // have a compile input. We need to run 'dsymutil' ourselves in such cases
633    // because the debug info will refer to a temporary object file which is
634    // will be removed at the end of the compilation process.
635    if (Act->getType() == types::TY_Image) {
636      Arg *A = Args.getLastArg(options::OPT_g_Group);
637      if (A && !A->getOption().matches(options::OPT_g0) &&
638          !A->getOption().matches(options::OPT_gstabs) &&
639          ContainsCompileAction(Actions.back())) {
640        ActionList Inputs;
641        Inputs.push_back(Actions.back());
642        Actions.pop_back();
643
644        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
645      }
646    }
647  }
648}
649
650void Driver::BuildActions(const ToolChain &TC, const ArgList &Args,
651                          ActionList &Actions) const {
652  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
653  // Start by constructing the list of inputs and their types.
654
655  // Track the current user specified (-x) input. We also explicitly track the
656  // argument used to set the type; we only want to claim the type when we
657  // actually use it, so we warn about unused -x arguments.
658  types::ID InputType = types::TY_Nothing;
659  Arg *InputTypeArg = 0;
660
661  llvm::SmallVector<std::pair<types::ID, const Arg*>, 16> Inputs;
662  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
663       it != ie; ++it) {
664    Arg *A = *it;
665
666    if (isa<InputOption>(A->getOption())) {
667      const char *Value = A->getValue(Args);
668      types::ID Ty = types::TY_INVALID;
669
670      // Infer the input type if necessary.
671      if (InputType == types::TY_Nothing) {
672        // If there was an explicit arg for this, claim it.
673        if (InputTypeArg)
674          InputTypeArg->claim();
675
676        // stdin must be handled specially.
677        if (memcmp(Value, "-", 2) == 0) {
678          // If running with -E, treat as a C input (this changes the builtin
679          // macros, for example). This may be overridden by -ObjC below.
680          //
681          // Otherwise emit an error but still use a valid type to avoid
682          // spurious errors (e.g., no inputs).
683          if (!Args.hasArgNoClaim(options::OPT_E))
684            Diag(clang::diag::err_drv_unknown_stdin_type);
685          Ty = types::TY_C;
686        } else {
687          // Otherwise lookup by extension, and fallback to ObjectType if not
688          // found. We use a host hook here because Darwin at least has its own
689          // idea of what .s is.
690          if (const char *Ext = strrchr(Value, '.'))
691            Ty = TC.LookupTypeForExtension(Ext + 1);
692
693          if (Ty == types::TY_INVALID)
694            Ty = types::TY_Object;
695
696          // If the driver is invoked as C++ compiler (like clang++ or c++) it
697          // should autodetect some input files as C++ for g++ compatibility.
698          if (CCCIsCXX) {
699            types::ID OldTy = Ty;
700            Ty = types::lookupCXXTypeForCType(Ty);
701
702            if (Ty != OldTy)
703              Diag(clang::diag::warn_drv_treating_input_as_cxx)
704                << getTypeName(OldTy) << getTypeName(Ty);
705          }
706        }
707
708        // -ObjC and -ObjC++ override the default language, but only for "source
709        // files". We just treat everything that isn't a linker input as a
710        // source file.
711        //
712        // FIXME: Clean this up if we move the phase sequence into the type.
713        if (Ty != types::TY_Object) {
714          if (Args.hasArg(options::OPT_ObjC))
715            Ty = types::TY_ObjC;
716          else if (Args.hasArg(options::OPT_ObjCXX))
717            Ty = types::TY_ObjCXX;
718        }
719      } else {
720        assert(InputTypeArg && "InputType set w/o InputTypeArg");
721        InputTypeArg->claim();
722        Ty = InputType;
723      }
724
725      // Check that the file exists, if enabled.
726      if (CheckInputsExist && memcmp(Value, "-", 2) != 0 &&
727          !llvm::sys::Path(Value).exists())
728        Diag(clang::diag::err_drv_no_such_file) << A->getValue(Args);
729      else
730        Inputs.push_back(std::make_pair(Ty, A));
731
732    } else if (A->getOption().isLinkerInput()) {
733      // Just treat as object type, we could make a special type for this if
734      // necessary.
735      Inputs.push_back(std::make_pair(types::TY_Object, A));
736
737    } else if (A->getOption().matches(options::OPT_x)) {
738      InputTypeArg = A;
739      InputType = types::lookupTypeForTypeSpecifier(A->getValue(Args));
740
741      // Follow gcc behavior and treat as linker input for invalid -x
742      // options. Its not clear why we shouldn't just revert to unknown; but
743      // this isn't very important, we might as well be bug comatible.
744      if (!InputType) {
745        Diag(clang::diag::err_drv_unknown_language) << A->getValue(Args);
746        InputType = types::TY_Object;
747      }
748    }
749  }
750
751  if (!SuppressMissingInputWarning && Inputs.empty()) {
752    Diag(clang::diag::err_drv_no_input_files);
753    return;
754  }
755
756  // Determine which compilation mode we are in. We look for options which
757  // affect the phase, starting with the earliest phases, and record which
758  // option we used to determine the final phase.
759  Arg *FinalPhaseArg = 0;
760  phases::ID FinalPhase;
761
762  // -{E,M,MM} only run the preprocessor.
763  if ((FinalPhaseArg = Args.getLastArg(options::OPT_E)) ||
764      (FinalPhaseArg = Args.getLastArg(options::OPT_M)) ||
765      (FinalPhaseArg = Args.getLastArg(options::OPT_MM))) {
766    FinalPhase = phases::Preprocess;
767
768    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
769  } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_fsyntax_only)) ||
770             (FinalPhaseArg = Args.getLastArg(options::OPT_rewrite_objc)) ||
771             (FinalPhaseArg = Args.getLastArg(options::OPT__analyze,
772                                              options::OPT__analyze_auto)) ||
773             (FinalPhaseArg = Args.getLastArg(options::OPT_emit_ast)) ||
774             (FinalPhaseArg = Args.getLastArg(options::OPT_S))) {
775    FinalPhase = phases::Compile;
776
777    // -c only runs up to the assembler.
778  } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_c))) {
779    FinalPhase = phases::Assemble;
780
781    // Otherwise do everything.
782  } else
783    FinalPhase = phases::Link;
784
785  // Reject -Z* at the top level, these options should never have been exposed
786  // by gcc.
787  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
788    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
789
790  // Construct the actions to perform.
791  ActionList LinkerInputs;
792  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
793    types::ID InputType = Inputs[i].first;
794    const Arg *InputArg = Inputs[i].second;
795
796    unsigned NumSteps = types::getNumCompilationPhases(InputType);
797    assert(NumSteps && "Invalid number of steps!");
798
799    // If the first step comes after the final phase we are doing as part of
800    // this compilation, warn the user about it.
801    phases::ID InitialPhase = types::getCompilationPhase(InputType, 0);
802    if (InitialPhase > FinalPhase) {
803      // Claim here to avoid the more general unused warning.
804      InputArg->claim();
805
806      // Special case '-E' warning on a previously preprocessed file to make
807      // more sense.
808      if (InitialPhase == phases::Compile && FinalPhase == phases::Preprocess &&
809          getPreprocessedType(InputType) == types::TY_INVALID)
810        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
811          << InputArg->getAsString(Args)
812          << FinalPhaseArg->getOption().getName();
813      else
814        Diag(clang::diag::warn_drv_input_file_unused)
815          << InputArg->getAsString(Args)
816          << getPhaseName(InitialPhase)
817          << FinalPhaseArg->getOption().getName();
818      continue;
819    }
820
821    // Build the pipeline for this file.
822    llvm::OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
823    for (unsigned i = 0; i != NumSteps; ++i) {
824      phases::ID Phase = types::getCompilationPhase(InputType, i);
825
826      // We are done if this step is past what the user requested.
827      if (Phase > FinalPhase)
828        break;
829
830      // Queue linker inputs.
831      if (Phase == phases::Link) {
832        assert(i + 1 == NumSteps && "linking must be final compilation step.");
833        LinkerInputs.push_back(Current.take());
834        break;
835      }
836
837      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
838      // encode this in the steps because the intermediate type depends on
839      // arguments. Just special case here.
840      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
841        continue;
842
843      // Otherwise construct the appropriate action.
844      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
845      if (Current->getType() == types::TY_Nothing)
846        break;
847    }
848
849    // If we ended with something, add to the output list.
850    if (Current)
851      Actions.push_back(Current.take());
852  }
853
854  // Add a link action if necessary.
855  if (!LinkerInputs.empty())
856    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
857
858  // If we are linking, claim any options which are obviously only used for
859  // compilation.
860  if (FinalPhase == phases::Link)
861    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
862}
863
864Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
865                                     Action *Input) const {
866  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
867  // Build the appropriate action.
868  switch (Phase) {
869  case phases::Link: assert(0 && "link action invalid here.");
870  case phases::Preprocess: {
871    types::ID OutputTy;
872    // -{M, MM} alter the output type.
873    if (Args.hasArg(options::OPT_M) || Args.hasArg(options::OPT_MM)) {
874      OutputTy = types::TY_Dependencies;
875    } else {
876      OutputTy = types::getPreprocessedType(Input->getType());
877      assert(OutputTy != types::TY_INVALID &&
878             "Cannot preprocess this input type!");
879    }
880    return new PreprocessJobAction(Input, OutputTy);
881  }
882  case phases::Precompile:
883    return new PrecompileJobAction(Input, types::TY_PCH);
884  case phases::Compile: {
885    bool HasO4 = false;
886    if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
887      HasO4 = A->getOption().matches(options::OPT_O4);
888
889    if (Args.hasArg(options::OPT_fsyntax_only)) {
890      return new CompileJobAction(Input, types::TY_Nothing);
891    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
892      return new CompileJobAction(Input, types::TY_RewrittenObjC);
893    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
894      return new AnalyzeJobAction(Input, types::TY_Plist);
895    } else if (Args.hasArg(options::OPT_emit_ast)) {
896      return new CompileJobAction(Input, types::TY_AST);
897    } else if (Args.hasArg(options::OPT_emit_llvm) ||
898               Args.hasArg(options::OPT_flto) || HasO4) {
899      types::ID Output =
900        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
901      return new CompileJobAction(Input, Output);
902    } else {
903      return new CompileJobAction(Input, types::TY_PP_Asm);
904    }
905  }
906  case phases::Assemble:
907    return new AssembleJobAction(Input, types::TY_Object);
908  }
909
910  assert(0 && "invalid phase in ConstructPhaseAction");
911  return 0;
912}
913
914void Driver::BuildJobs(Compilation &C) const {
915  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
916
917  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
918
919  // It is an error to provide a -o option if we are making multiple output
920  // files.
921  if (FinalOutput) {
922    unsigned NumOutputs = 0;
923    for (ActionList::const_iterator it = C.getActions().begin(),
924           ie = C.getActions().end(); it != ie; ++it)
925      if ((*it)->getType() != types::TY_Nothing)
926        ++NumOutputs;
927
928    if (NumOutputs > 1) {
929      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
930      FinalOutput = 0;
931    }
932  }
933
934  for (ActionList::const_iterator it = C.getActions().begin(),
935         ie = C.getActions().end(); it != ie; ++it) {
936    Action *A = *it;
937
938    // If we are linking an image for multiple archs then the linker wants
939    // -arch_multiple and -final_output <final image name>. Unfortunately, this
940    // doesn't fit in cleanly because we have to pass this information down.
941    //
942    // FIXME: This is a hack; find a cleaner way to integrate this into the
943    // process.
944    const char *LinkingOutput = 0;
945    if (isa<LipoJobAction>(A)) {
946      if (FinalOutput)
947        LinkingOutput = FinalOutput->getValue(C.getArgs());
948      else
949        LinkingOutput = DefaultImageName.c_str();
950    }
951
952    InputInfo II;
953    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
954                       /*BoundArch*/0,
955                       /*AtTopLevel*/ true,
956                       /*LinkingOutput*/ LinkingOutput,
957                       II);
958  }
959
960  // If the user passed -Qunused-arguments or there were errors, don't warn
961  // about any unused arguments.
962  if (Diags.getNumErrors() ||
963      C.getArgs().hasArg(options::OPT_Qunused_arguments))
964    return;
965
966  // Claim -### here.
967  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
968
969  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
970       it != ie; ++it) {
971    Arg *A = *it;
972
973    // FIXME: It would be nice to be able to send the argument to the
974    // Diagnostic, so that extra values, position, and so on could be printed.
975    if (!A->isClaimed()) {
976      if (A->getOption().hasNoArgumentUnused())
977        continue;
978
979      // Suppress the warning automatically if this is just a flag, and it is an
980      // instance of an argument we already claimed.
981      const Option &Opt = A->getOption();
982      if (isa<FlagOption>(Opt)) {
983        bool DuplicateClaimed = false;
984
985        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
986               ie = C.getArgs().filtered_end(); it != ie; ++it) {
987          if ((*it)->isClaimed()) {
988            DuplicateClaimed = true;
989            break;
990          }
991        }
992
993        if (DuplicateClaimed)
994          continue;
995      }
996
997      Diag(clang::diag::warn_drv_unused_argument)
998        << A->getAsString(C.getArgs());
999    }
1000  }
1001}
1002
1003static const Tool &SelectToolForJob(Compilation &C, const ToolChain *TC,
1004                                    const JobAction *JA,
1005                                    const ActionList *&Inputs) {
1006  const Tool *ToolForJob = 0;
1007
1008  // See if we should look for a compiler with an integrated assembler. We match
1009  // bottom up, so what we are actually looking for is an assembler job with a
1010  // compiler input.
1011
1012  // FIXME: This doesn't belong here, but ideally we will support static soon
1013  // anyway.
1014  bool HasStatic = (C.getArgs().hasArg(options::OPT_mkernel) ||
1015                    C.getArgs().hasArg(options::OPT_static) ||
1016                    C.getArgs().hasArg(options::OPT_fapple_kext));
1017  bool IsIADefault = (TC->IsIntegratedAssemblerDefault() && !HasStatic);
1018  if (C.getArgs().hasFlag(options::OPT_integrated_as,
1019                         options::OPT_no_integrated_as,
1020                         IsIADefault) &&
1021      !C.getArgs().hasArg(options::OPT_save_temps) &&
1022      isa<AssembleJobAction>(JA) &&
1023      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1024    const Tool &Compiler = TC->SelectTool(C,cast<JobAction>(**Inputs->begin()));
1025    if (Compiler.hasIntegratedAssembler()) {
1026      Inputs = &(*Inputs)[0]->getInputs();
1027      ToolForJob = &Compiler;
1028    }
1029  }
1030
1031  // Otherwise use the tool for the current job.
1032  if (!ToolForJob)
1033    ToolForJob = &TC->SelectTool(C, *JA);
1034
1035  // See if we should use an integrated preprocessor. We do so when we have
1036  // exactly one input, since this is the only use case we care about
1037  // (irrelevant since we don't support combine yet).
1038  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1039      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1040      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1041      !C.getArgs().hasArg(options::OPT_save_temps) &&
1042      ToolForJob->hasIntegratedCPP())
1043    Inputs = &(*Inputs)[0]->getInputs();
1044
1045  return *ToolForJob;
1046}
1047
1048void Driver::BuildJobsForAction(Compilation &C,
1049                                const Action *A,
1050                                const ToolChain *TC,
1051                                const char *BoundArch,
1052                                bool AtTopLevel,
1053                                const char *LinkingOutput,
1054                                InputInfo &Result) const {
1055  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1056
1057  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1058    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1059    // just using Args was better?
1060    const Arg &Input = IA->getInputArg();
1061    Input.claim();
1062    if (Input.getOption().matches(options::OPT_INPUT)) {
1063      const char *Name = Input.getValue(C.getArgs());
1064      Result = InputInfo(Name, A->getType(), Name);
1065    } else
1066      Result = InputInfo(&Input, A->getType(), "");
1067    return;
1068  }
1069
1070  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1071    const ToolChain *TC = &C.getDefaultToolChain();
1072
1073    std::string Arch;
1074    if (BAA->getArchName())
1075      TC = Host->CreateToolChain(C.getArgs(), BAA->getArchName());
1076
1077    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1078                       AtTopLevel, LinkingOutput, Result);
1079    return;
1080  }
1081
1082  const ActionList *Inputs = &A->getInputs();
1083
1084  const JobAction *JA = cast<JobAction>(A);
1085  const Tool &T = SelectToolForJob(C, TC, JA, Inputs);
1086
1087  // Only use pipes when there is exactly one input.
1088  InputInfoList InputInfos;
1089  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1090       it != ie; ++it) {
1091    // Treat dsymutil sub-jobs as being at the top-level too, they shouldn't get
1092    // temporary output names.
1093    //
1094    // FIXME: Clean this up.
1095    bool SubJobAtTopLevel = false;
1096    if (AtTopLevel && isa<DsymutilJobAction>(A))
1097      SubJobAtTopLevel = true;
1098
1099    InputInfo II;
1100    BuildJobsForAction(C, *it, TC, BoundArch,
1101                       SubJobAtTopLevel, LinkingOutput, II);
1102    InputInfos.push_back(II);
1103  }
1104
1105  // Always use the first input as the base input.
1106  const char *BaseInput = InputInfos[0].getBaseInput();
1107
1108  // ... except dsymutil actions, which use their actual input as the base
1109  // input.
1110  if (JA->getType() == types::TY_dSYM)
1111    BaseInput = InputInfos[0].getFilename();
1112
1113  // Determine the place to write output to, if any.
1114  if (JA->getType() == types::TY_Nothing) {
1115    Result = InputInfo(A->getType(), BaseInput);
1116  } else {
1117    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, AtTopLevel),
1118                       A->getType(), BaseInput);
1119  }
1120
1121  if (CCCPrintBindings) {
1122    llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
1123                 << " - \"" << T.getName() << "\", inputs: [";
1124    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1125      llvm::errs() << InputInfos[i].getAsString();
1126      if (i + 1 != e)
1127        llvm::errs() << ", ";
1128    }
1129    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1130  } else {
1131    T.ConstructJob(C, *JA, Result, InputInfos,
1132                   C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1133  }
1134}
1135
1136const char *Driver::GetNamedOutputPath(Compilation &C,
1137                                       const JobAction &JA,
1138                                       const char *BaseInput,
1139                                       bool AtTopLevel) const {
1140  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1141  // Output to a user requested destination?
1142  if (AtTopLevel && !isa<DsymutilJobAction>(JA)) {
1143    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1144      return C.addResultFile(FinalOutput->getValue(C.getArgs()));
1145  }
1146
1147  // Default to writing to stdout?
1148  if (AtTopLevel && isa<PreprocessJobAction>(JA))
1149    return "-";
1150
1151  // Output to a temporary file?
1152  if (!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) {
1153    std::string TmpName =
1154      GetTemporaryPath(types::getTypeTempSuffix(JA.getType()));
1155    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1156  }
1157
1158  llvm::sys::Path BasePath(BaseInput);
1159  std::string BaseName(BasePath.getLast());
1160
1161  // Determine what the derived output name should be.
1162  const char *NamedOutput;
1163  if (JA.getType() == types::TY_Image) {
1164    NamedOutput = DefaultImageName.c_str();
1165  } else {
1166    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1167    assert(Suffix && "All types used for output should have a suffix.");
1168
1169    std::string::size_type End = std::string::npos;
1170    if (!types::appendSuffixForType(JA.getType()))
1171      End = BaseName.rfind('.');
1172    std::string Suffixed(BaseName.substr(0, End));
1173    Suffixed += '.';
1174    Suffixed += Suffix;
1175    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1176  }
1177
1178  // As an annoying special case, PCH generation doesn't strip the pathname.
1179  if (JA.getType() == types::TY_PCH) {
1180    BasePath.eraseComponent();
1181    if (BasePath.isEmpty())
1182      BasePath = NamedOutput;
1183    else
1184      BasePath.appendComponent(NamedOutput);
1185    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()));
1186  } else {
1187    return C.addResultFile(NamedOutput);
1188  }
1189}
1190
1191std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1192  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1193  // attempting to use this prefix when lokup up program paths.
1194  if (!PrefixDir.empty()) {
1195    llvm::sys::Path P(PrefixDir);
1196    P.appendComponent(Name);
1197    if (P.exists())
1198      return P.str();
1199  }
1200
1201  const ToolChain::path_list &List = TC.getFilePaths();
1202  for (ToolChain::path_list::const_iterator
1203         it = List.begin(), ie = List.end(); it != ie; ++it) {
1204    llvm::sys::Path P(*it);
1205    P.appendComponent(Name);
1206    if (P.exists())
1207      return P.str();
1208  }
1209
1210  return Name;
1211}
1212
1213std::string Driver::GetProgramPath(const char *Name, const ToolChain &TC,
1214                                   bool WantFile) const {
1215  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1216  // attempting to use this prefix when lokup up program paths.
1217  if (!PrefixDir.empty()) {
1218    llvm::sys::Path P(PrefixDir);
1219    P.appendComponent(Name);
1220    if (WantFile ? P.exists() : P.canExecute())
1221      return P.str();
1222  }
1223
1224  const ToolChain::path_list &List = TC.getProgramPaths();
1225  for (ToolChain::path_list::const_iterator
1226         it = List.begin(), ie = List.end(); it != ie; ++it) {
1227    llvm::sys::Path P(*it);
1228    P.appendComponent(Name);
1229    if (WantFile ? P.exists() : P.canExecute())
1230      return P.str();
1231  }
1232
1233  // If all else failed, search the path.
1234  llvm::sys::Path P(llvm::sys::Program::FindProgramByName(Name));
1235  if (!P.empty())
1236    return P.str();
1237
1238  return Name;
1239}
1240
1241std::string Driver::GetTemporaryPath(const char *Suffix) const {
1242  // FIXME: This is lame; sys::Path should provide this function (in particular,
1243  // it should know how to find the temporary files dir).
1244  std::string Error;
1245  const char *TmpDir = ::getenv("TMPDIR");
1246  if (!TmpDir)
1247    TmpDir = ::getenv("TEMP");
1248  if (!TmpDir)
1249    TmpDir = ::getenv("TMP");
1250  if (!TmpDir)
1251    TmpDir = "/tmp";
1252  llvm::sys::Path P(TmpDir);
1253  P.appendComponent("cc");
1254  if (P.makeUnique(false, &Error)) {
1255    Diag(clang::diag::err_drv_unable_to_make_temp) << Error;
1256    return "";
1257  }
1258
1259  // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
1260  P.eraseFromDisk(false, 0);
1261
1262  P.appendSuffix(Suffix);
1263  return P.str();
1264}
1265
1266const HostInfo *Driver::GetHostInfo(const char *TripleStr) const {
1267  llvm::PrettyStackTraceString CrashInfo("Constructing host");
1268  llvm::Triple Triple(TripleStr);
1269
1270  // TCE is an osless target
1271  if (Triple.getArchName() == "tce")
1272    return createTCEHostInfo(*this, Triple);
1273
1274  switch (Triple.getOS()) {
1275  case llvm::Triple::AuroraUX:
1276    return createAuroraUXHostInfo(*this, Triple);
1277  case llvm::Triple::Darwin:
1278    return createDarwinHostInfo(*this, Triple);
1279  case llvm::Triple::DragonFly:
1280    return createDragonFlyHostInfo(*this, Triple);
1281  case llvm::Triple::OpenBSD:
1282    return createOpenBSDHostInfo(*this, Triple);
1283  case llvm::Triple::FreeBSD:
1284    return createFreeBSDHostInfo(*this, Triple);
1285  case llvm::Triple::Minix:
1286    return createMinixHostInfo(*this, Triple);
1287  case llvm::Triple::Linux:
1288    return createLinuxHostInfo(*this, Triple);
1289  case llvm::Triple::Win32:
1290    return createWindowsHostInfo(*this, Triple);
1291  case llvm::Triple::MinGW32:
1292  case llvm::Triple::MinGW64:
1293    return createMinGWHostInfo(*this, Triple);
1294  default:
1295    return createUnknownHostInfo(*this, Triple);
1296  }
1297}
1298
1299bool Driver::ShouldUseClangCompiler(const Compilation &C, const JobAction &JA,
1300                                    const llvm::Triple &Triple) const {
1301  // Check if user requested no clang, or clang doesn't understand this type (we
1302  // only handle single inputs for now).
1303  if (!CCCUseClang || JA.size() != 1 ||
1304      !types::isAcceptedByClang((*JA.begin())->getType()))
1305    return false;
1306
1307  // Otherwise make sure this is an action clang understands.
1308  if (isa<PreprocessJobAction>(JA)) {
1309    if (!CCCUseClangCPP) {
1310      Diag(clang::diag::warn_drv_not_using_clang_cpp);
1311      return false;
1312    }
1313  } else if (!isa<PrecompileJobAction>(JA) && !isa<CompileJobAction>(JA))
1314    return false;
1315
1316  // Use clang for C++?
1317  if (!CCCUseClangCXX && types::isCXX((*JA.begin())->getType())) {
1318    Diag(clang::diag::warn_drv_not_using_clang_cxx);
1319    return false;
1320  }
1321
1322  // Always use clang for precompiling, AST generation, and rewriting,
1323  // regardless of archs.
1324  if (isa<PrecompileJobAction>(JA) ||
1325      types::isOnlyAcceptedByClang(JA.getType()))
1326    return true;
1327
1328  // Finally, don't use clang if this isn't one of the user specified archs to
1329  // build.
1330  if (!CCCClangArchs.empty() && !CCCClangArchs.count(Triple.getArch())) {
1331    Diag(clang::diag::warn_drv_not_using_clang_arch) << Triple.getArchName();
1332    return false;
1333  }
1334
1335  return true;
1336}
1337
1338/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1339/// grouped values as integers. Numbers which are not provided are set to 0.
1340///
1341/// \return True if the entire string was parsed (9.2), or all groups were
1342/// parsed (10.3.5extrastuff).
1343bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1344                               unsigned &Minor, unsigned &Micro,
1345                               bool &HadExtra) {
1346  HadExtra = false;
1347
1348  Major = Minor = Micro = 0;
1349  if (*Str == '\0')
1350    return true;
1351
1352  char *End;
1353  Major = (unsigned) strtol(Str, &End, 10);
1354  if (*Str != '\0' && *End == '\0')
1355    return true;
1356  if (*End != '.')
1357    return false;
1358
1359  Str = End+1;
1360  Minor = (unsigned) strtol(Str, &End, 10);
1361  if (*Str != '\0' && *End == '\0')
1362    return true;
1363  if (*End != '.')
1364    return false;
1365
1366  Str = End+1;
1367  Micro = (unsigned) strtol(Str, &End, 10);
1368  if (*Str != '\0' && *End == '\0')
1369    return true;
1370  if (Str == End)
1371    return false;
1372  HadExtra = true;
1373  return true;
1374}
1375