Driver.cpp revision 59c8457f01f908e75d0e61ec3bd99cebcd672cee 
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#ifdef HAVE_CLANG_CONFIG_H
11# include "clang/Config/config.h"
12#endif
13
14#include "clang/Driver/Driver.h"
15
16#include "clang/Driver/Action.h"
17#include "clang/Driver/Arg.h"
18#include "clang/Driver/ArgList.h"
19#include "clang/Driver/Compilation.h"
20#include "clang/Driver/DriverDiagnostic.h"
21#include "clang/Driver/HostInfo.h"
22#include "clang/Driver/Job.h"
23#include "clang/Driver/OptTable.h"
24#include "clang/Driver/Option.h"
25#include "clang/Driver/Options.h"
26#include "clang/Driver/Tool.h"
27#include "clang/Driver/ToolChain.h"
28#include "clang/Driver/Types.h"
29
30#include "clang/Basic/Version.h"
31
32#include "llvm/Config/config.h"
33#include "llvm/ADT/ArrayRef.h"
34#include "llvm/ADT/StringSet.h"
35#include "llvm/ADT/OwningPtr.h"
36#include "llvm/Support/PrettyStackTrace.h"
37#include "llvm/Support/raw_ostream.h"
38#include "llvm/Support/FileSystem.h"
39#include "llvm/Support/Path.h"
40#include "llvm/Support/Program.h"
41
42#include "InputInfo.h"
43
44#include <map>
45
46using namespace clang::driver;
47using namespace clang;
48
49Driver::Driver(llvm::StringRef ClangExecutable,
50               llvm::StringRef DefaultHostTriple,
51               llvm::StringRef DefaultImageName,
52               bool IsProduction, bool CXXIsProduction,
53               Diagnostic &Diags)
54  : Opts(createDriverOptTable()), Diags(Diags),
55    ClangExecutable(ClangExecutable), UseStdLib(true),
56    DefaultHostTriple(DefaultHostTriple), DefaultImageName(DefaultImageName),
57    DriverTitle("clang \"gcc-compatible\" driver"),
58    Host(0),
59    CCPrintOptionsFilename(0), CCPrintHeadersFilename(0),
60    CCLogDiagnosticsFilename(0), CCCIsCXX(false),
61    CCCIsCPP(false),CCCEcho(false), CCCPrintBindings(false),
62    CCPrintOptions(false), CCPrintHeaders(false), CCLogDiagnostics(false),
63    CCCGenericGCCName(""), CheckInputsExist(true), CCCUseClang(true),
64    CCCUseClangCXX(true), CCCUseClangCPP(true), CCCUsePCH(true),
65    SuppressMissingInputWarning(false) {
66  if (IsProduction) {
67    // In a "production" build, only use clang on architectures we expect to
68    // work, and don't use clang C++.
69    //
70    // During development its more convenient to always have the driver use
71    // clang, but we don't want users to be confused when things don't work, or
72    // to file bugs for things we don't support.
73    CCCClangArchs.insert(llvm::Triple::x86);
74    CCCClangArchs.insert(llvm::Triple::x86_64);
75    CCCClangArchs.insert(llvm::Triple::arm);
76
77    if (!CXXIsProduction)
78      CCCUseClangCXX = false;
79  }
80
81  Name = llvm::sys::path::stem(ClangExecutable);
82  Dir  = llvm::sys::path::parent_path(ClangExecutable);
83
84  // Compute the path to the resource directory.
85  llvm::StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
86  llvm::SmallString<128> P(Dir);
87  if (ClangResourceDir != "")
88    llvm::sys::path::append(P, ClangResourceDir);
89  else
90    llvm::sys::path::append(P, "..", "lib", "clang", CLANG_VERSION_STRING);
91  ResourceDir = P.str();
92}
93
94Driver::~Driver() {
95  delete Opts;
96  delete Host;
97}
98
99InputArgList *Driver::ParseArgStrings(llvm::ArrayRef<const char *> ArgList) {
100  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
101  unsigned MissingArgIndex, MissingArgCount;
102  InputArgList *Args = getOpts().ParseArgs(ArgList.begin(), ArgList.end(),
103                                           MissingArgIndex, MissingArgCount);
104
105  // Check for missing argument error.
106  if (MissingArgCount)
107    Diag(clang::diag::err_drv_missing_argument)
108      << Args->getArgString(MissingArgIndex) << MissingArgCount;
109
110  // Check for unsupported options.
111  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
112       it != ie; ++it) {
113    Arg *A = *it;
114    if (A->getOption().isUnsupported()) {
115      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
116      continue;
117    }
118  }
119
120  return Args;
121}
122
123DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
124  DerivedArgList *DAL = new DerivedArgList(Args);
125
126  bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
127  for (ArgList::const_iterator it = Args.begin(),
128         ie = Args.end(); it != ie; ++it) {
129    const Arg *A = *it;
130
131    // Unfortunately, we have to parse some forwarding options (-Xassembler,
132    // -Xlinker, -Xpreprocessor) because we either integrate their functionality
133    // (assembler and preprocessor), or bypass a previous driver ('collect2').
134
135    // Rewrite linker options, to replace --no-demangle with a custom internal
136    // option.
137    if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
138         A->getOption().matches(options::OPT_Xlinker)) &&
139        A->containsValue("--no-demangle")) {
140      // Add the rewritten no-demangle argument.
141      DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_Xlinker__no_demangle));
142
143      // Add the remaining values as Xlinker arguments.
144      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
145        if (llvm::StringRef(A->getValue(Args, i)) != "--no-demangle")
146          DAL->AddSeparateArg(A, Opts->getOption(options::OPT_Xlinker),
147                              A->getValue(Args, i));
148
149      continue;
150    }
151
152    // Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
153    // some build systems. We don't try to be complete here because we don't
154    // care to encourage this usage model.
155    if (A->getOption().matches(options::OPT_Wp_COMMA) &&
156        A->getNumValues() == 2 &&
157        (A->getValue(Args, 0) == llvm::StringRef("-MD") ||
158         A->getValue(Args, 0) == llvm::StringRef("-MMD"))) {
159      // Rewrite to -MD/-MMD along with -MF.
160      if (A->getValue(Args, 0) == llvm::StringRef("-MD"))
161        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MD));
162      else
163        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MMD));
164      DAL->AddSeparateArg(A, Opts->getOption(options::OPT_MF),
165                          A->getValue(Args, 1));
166      continue;
167    }
168
169    // Rewrite reserved library names.
170    if (A->getOption().matches(options::OPT_l)) {
171      llvm::StringRef Value = A->getValue(Args);
172
173      // Rewrite unless -nostdlib is present.
174      if (!HasNostdlib && Value == "stdc++") {
175        DAL->AddFlagArg(A, Opts->getOption(
176                              options::OPT_Z_reserved_lib_stdcxx));
177        continue;
178      }
179
180      // Rewrite unconditionally.
181      if (Value == "cc_kext") {
182        DAL->AddFlagArg(A, Opts->getOption(
183                              options::OPT_Z_reserved_lib_cckext));
184        continue;
185      }
186    }
187
188    DAL->append(*it);
189  }
190
191  // Add a default value of -mlinker-version=, if one was given and the user
192  // didn't specify one.
193#if defined(HOST_LINK_VERSION)
194  if (!Args.hasArg(options::OPT_mlinker_version_EQ)) {
195    DAL->AddJoinedArg(0, Opts->getOption(options::OPT_mlinker_version_EQ),
196                      HOST_LINK_VERSION);
197    DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
198  }
199#endif
200
201  return DAL;
202}
203
204Compilation *Driver::BuildCompilation(llvm::ArrayRef<const char *> ArgList) {
205  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
206
207  // FIXME: Handle environment options which effect driver behavior, somewhere
208  // (client?). GCC_EXEC_PREFIX, COMPILER_PATH, LIBRARY_PATH, LPATH,
209  // CC_PRINT_OPTIONS.
210
211  // FIXME: What are we going to do with -V and -b?
212
213  // FIXME: This stuff needs to go into the Compilation, not the driver.
214  bool CCCPrintOptions = false, CCCPrintActions = false;
215
216  InputArgList *Args = ParseArgStrings(ArgList.slice(1));
217
218  // -no-canonical-prefixes is used very early in main.
219  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
220
221  // Ignore -pipe.
222  Args->ClaimAllArgs(options::OPT_pipe);
223
224  // Extract -ccc args.
225  //
226  // FIXME: We need to figure out where this behavior should live. Most of it
227  // should be outside in the client; the parts that aren't should have proper
228  // options, either by introducing new ones or by overloading gcc ones like -V
229  // or -b.
230  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
231  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
232  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
233  CCCIsCXX = Args->hasArg(options::OPT_ccc_cxx) || CCCIsCXX;
234  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
235  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
236    CCCGenericGCCName = A->getValue(*Args);
237  CCCUseClangCXX = Args->hasFlag(options::OPT_ccc_clang_cxx,
238                                 options::OPT_ccc_no_clang_cxx,
239                                 CCCUseClangCXX);
240  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
241                            options::OPT_ccc_pch_is_pth);
242  CCCUseClang = !Args->hasArg(options::OPT_ccc_no_clang);
243  CCCUseClangCPP = !Args->hasArg(options::OPT_ccc_no_clang_cpp);
244  if (const Arg *A = Args->getLastArg(options::OPT_ccc_clang_archs)) {
245    llvm::StringRef Cur = A->getValue(*Args);
246
247    CCCClangArchs.clear();
248    while (!Cur.empty()) {
249      std::pair<llvm::StringRef, llvm::StringRef> Split = Cur.split(',');
250
251      if (!Split.first.empty()) {
252        llvm::Triple::ArchType Arch =
253          llvm::Triple(Split.first, "", "").getArch();
254
255        if (Arch == llvm::Triple::UnknownArch)
256          Diag(clang::diag::err_drv_invalid_arch_name) << Split.first;
257
258        CCCClangArchs.insert(Arch);
259      }
260
261      Cur = Split.second;
262    }
263  }
264  // FIXME: We shouldn't overwrite the default host triple here, but we have
265  // nowhere else to put this currently.
266  if (const Arg *A = Args->getLastArg(options::OPT_ccc_host_triple))
267    DefaultHostTriple = A->getValue(*Args);
268  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
269    Dir = InstalledDir = A->getValue(*Args);
270  for (arg_iterator it = Args->filtered_begin(options::OPT_B),
271         ie = Args->filtered_end(); it != ie; ++it) {
272    const Arg *A = *it;
273    A->claim();
274    PrefixDirs.push_back(A->getValue(*Args, 0));
275  }
276  if (const Arg *A = Args->getLastArg(options::OPT__sysroot_EQ))
277    SysRoot = A->getValue(*Args);
278  if (Args->hasArg(options::OPT_nostdlib))
279    UseStdLib = false;
280
281  Host = GetHostInfo(DefaultHostTriple.c_str());
282
283  // Perform the default argument translations.
284  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
285
286  // The compilation takes ownership of Args.
287  Compilation *C = new Compilation(*this, *Host->CreateToolChain(*Args), Args,
288                                   TranslatedArgs);
289
290  // FIXME: This behavior shouldn't be here.
291  if (CCCPrintOptions) {
292    PrintOptions(C->getInputArgs());
293    return C;
294  }
295
296  if (!HandleImmediateArgs(*C))
297    return C;
298
299  // Construct the list of abstract actions to perform for this compilation.
300  if (Host->useDriverDriver())
301    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
302                          C->getActions());
303  else
304    BuildActions(C->getDefaultToolChain(), C->getArgs(), C->getActions());
305
306  if (CCCPrintActions) {
307    PrintActions(*C);
308    return C;
309  }
310
311  BuildJobs(*C);
312
313  return C;
314}
315
316int Driver::ExecuteCompilation(const Compilation &C) const {
317  // Just print if -### was present.
318  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
319    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
320    return 0;
321  }
322
323  // If there were errors building the compilation, quit now.
324  if (getDiags().hasErrorOccurred())
325    return 1;
326
327  const Command *FailingCommand = 0;
328  int Res = C.ExecuteJob(C.getJobs(), FailingCommand);
329
330  // Remove temp files.
331  C.CleanupFileList(C.getTempFiles());
332
333  // If the command succeeded, we are done.
334  if (Res == 0)
335    return Res;
336
337  // Otherwise, remove result files as well.
338  if (!C.getArgs().hasArg(options::OPT_save_temps))
339    C.CleanupFileList(C.getResultFiles(), true);
340
341  // Print extra information about abnormal failures, if possible.
342  //
343  // This is ad-hoc, but we don't want to be excessively noisy. If the result
344  // status was 1, assume the command failed normally. In particular, if it was
345  // the compiler then assume it gave a reasonable error code. Failures in other
346  // tools are less common, and they generally have worse diagnostics, so always
347  // print the diagnostic there.
348  const Tool &FailingTool = FailingCommand->getCreator();
349
350  if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
351    // FIXME: See FIXME above regarding result code interpretation.
352    if (Res < 0)
353      Diag(clang::diag::err_drv_command_signalled)
354        << FailingTool.getShortName() << -Res;
355    else
356      Diag(clang::diag::err_drv_command_failed)
357        << FailingTool.getShortName() << Res;
358  }
359
360  return Res;
361}
362
363void Driver::PrintOptions(const ArgList &Args) const {
364  unsigned i = 0;
365  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
366       it != ie; ++it, ++i) {
367    Arg *A = *it;
368    llvm::errs() << "Option " << i << " - "
369                 << "Name: \"" << A->getOption().getName() << "\", "
370                 << "Values: {";
371    for (unsigned j = 0; j < A->getNumValues(); ++j) {
372      if (j)
373        llvm::errs() << ", ";
374      llvm::errs() << '"' << A->getValue(Args, j) << '"';
375    }
376    llvm::errs() << "}\n";
377  }
378}
379
380void Driver::PrintHelp(bool ShowHidden) const {
381  getOpts().PrintHelp(llvm::outs(), Name.c_str(), DriverTitle.c_str(),
382                      ShowHidden);
383}
384
385void Driver::PrintVersion(const Compilation &C, llvm::raw_ostream &OS) const {
386  // FIXME: The following handlers should use a callback mechanism, we don't
387  // know what the client would like to do.
388  OS << getClangFullVersion() << '\n';
389  const ToolChain &TC = C.getDefaultToolChain();
390  OS << "Target: " << TC.getTripleString() << '\n';
391
392  // Print the threading model.
393  //
394  // FIXME: Implement correctly.
395  OS << "Thread model: " << "posix" << '\n';
396}
397
398/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
399/// option.
400static void PrintDiagnosticCategories(llvm::raw_ostream &OS) {
401  // Skip the empty category.
402  for (unsigned i = 1, max = DiagnosticIDs::getNumberOfCategories();
403       i != max; ++i)
404    OS << i << ',' << DiagnosticIDs::getCategoryNameFromID(i) << '\n';
405}
406
407bool Driver::HandleImmediateArgs(const Compilation &C) {
408  // The order these options are handled in gcc is all over the place, but we
409  // don't expect inconsistencies w.r.t. that to matter in practice.
410
411  if (C.getArgs().hasArg(options::OPT_dumpmachine)) {
412    llvm::outs() << C.getDefaultToolChain().getTripleString() << '\n';
413    return false;
414  }
415
416  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
417    // Since -dumpversion is only implemented for pedantic GCC compatibility, we
418    // return an answer which matches our definition of __VERSION__.
419    //
420    // If we want to return a more correct answer some day, then we should
421    // introduce a non-pedantically GCC compatible mode to Clang in which we
422    // provide sensible definitions for -dumpversion, __VERSION__, etc.
423    llvm::outs() << "4.2.1\n";
424    return false;
425  }
426
427  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
428    PrintDiagnosticCategories(llvm::outs());
429    return false;
430  }
431
432  if (C.getArgs().hasArg(options::OPT__help) ||
433      C.getArgs().hasArg(options::OPT__help_hidden)) {
434    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
435    return false;
436  }
437
438  if (C.getArgs().hasArg(options::OPT__version)) {
439    // Follow gcc behavior and use stdout for --version and stderr for -v.
440    PrintVersion(C, llvm::outs());
441    return false;
442  }
443
444  if (C.getArgs().hasArg(options::OPT_v) ||
445      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
446    PrintVersion(C, llvm::errs());
447    SuppressMissingInputWarning = true;
448  }
449
450  const ToolChain &TC = C.getDefaultToolChain();
451  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
452    llvm::outs() << "programs: =";
453    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
454           ie = TC.getProgramPaths().end(); it != ie; ++it) {
455      if (it != TC.getProgramPaths().begin())
456        llvm::outs() << ':';
457      llvm::outs() << *it;
458    }
459    llvm::outs() << "\n";
460    llvm::outs() << "libraries: =";
461
462    std::string sysroot;
463    if (Arg *A = C.getArgs().getLastArg(options::OPT__sysroot_EQ))
464      sysroot = A->getValue(C.getArgs());
465
466    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
467           ie = TC.getFilePaths().end(); it != ie; ++it) {
468      if (it != TC.getFilePaths().begin())
469        llvm::outs() << ':';
470      const char *path = it->c_str();
471      if (path[0] == '=')
472        llvm::outs() << sysroot << path + 1;
473      else
474        llvm::outs() << path;
475    }
476    llvm::outs() << "\n";
477    return false;
478  }
479
480  // FIXME: The following handlers should use a callback mechanism, we don't
481  // know what the client would like to do.
482  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
483    llvm::outs() << GetFilePath(A->getValue(C.getArgs()), TC) << "\n";
484    return false;
485  }
486
487  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
488    llvm::outs() << GetProgramPath(A->getValue(C.getArgs()), TC) << "\n";
489    return false;
490  }
491
492  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
493    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
494    return false;
495  }
496
497  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
498    // FIXME: We need tool chain support for this.
499    llvm::outs() << ".;\n";
500
501    switch (C.getDefaultToolChain().getTriple().getArch()) {
502    default:
503      break;
504
505    case llvm::Triple::x86_64:
506      llvm::outs() << "x86_64;@m64" << "\n";
507      break;
508
509    case llvm::Triple::ppc64:
510      llvm::outs() << "ppc64;@m64" << "\n";
511      break;
512    }
513    return false;
514  }
515
516  // FIXME: What is the difference between print-multi-directory and
517  // print-multi-os-directory?
518  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
519      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
520    switch (C.getDefaultToolChain().getTriple().getArch()) {
521    default:
522    case llvm::Triple::x86:
523    case llvm::Triple::ppc:
524      llvm::outs() << "." << "\n";
525      break;
526
527    case llvm::Triple::x86_64:
528      llvm::outs() << "x86_64" << "\n";
529      break;
530
531    case llvm::Triple::ppc64:
532      llvm::outs() << "ppc64" << "\n";
533      break;
534    }
535    return false;
536  }
537
538  return true;
539}
540
541static unsigned PrintActions1(const Compilation &C, Action *A,
542                              std::map<Action*, unsigned> &Ids) {
543  if (Ids.count(A))
544    return Ids[A];
545
546  std::string str;
547  llvm::raw_string_ostream os(str);
548
549  os << Action::getClassName(A->getKind()) << ", ";
550  if (InputAction *IA = dyn_cast<InputAction>(A)) {
551    os << "\"" << IA->getInputArg().getValue(C.getArgs()) << "\"";
552  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
553    os << '"' << (BIA->getArchName() ? BIA->getArchName() :
554                  C.getDefaultToolChain().getArchName()) << '"'
555       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
556  } else {
557    os << "{";
558    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
559      os << PrintActions1(C, *it, Ids);
560      ++it;
561      if (it != ie)
562        os << ", ";
563    }
564    os << "}";
565  }
566
567  unsigned Id = Ids.size();
568  Ids[A] = Id;
569  llvm::errs() << Id << ": " << os.str() << ", "
570               << types::getTypeName(A->getType()) << "\n";
571
572  return Id;
573}
574
575void Driver::PrintActions(const Compilation &C) const {
576  std::map<Action*, unsigned> Ids;
577  for (ActionList::const_iterator it = C.getActions().begin(),
578         ie = C.getActions().end(); it != ie; ++it)
579    PrintActions1(C, *it, Ids);
580}
581
582/// \brief Check whether the given input tree contains any compilation or
583/// assembly actions.
584static bool ContainsCompileOrAssembleAction(const Action *A) {
585  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
586    return true;
587
588  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
589    if (ContainsCompileOrAssembleAction(*it))
590      return true;
591
592  return false;
593}
594
595void Driver::BuildUniversalActions(const ToolChain &TC,
596                                   const DerivedArgList &Args,
597                                   ActionList &Actions) const {
598  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
599  // Collect the list of architectures. Duplicates are allowed, but should only
600  // be handled once (in the order seen).
601  llvm::StringSet<> ArchNames;
602  llvm::SmallVector<const char *, 4> Archs;
603  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
604       it != ie; ++it) {
605    Arg *A = *it;
606
607    if (A->getOption().matches(options::OPT_arch)) {
608      // Validate the option here; we don't save the type here because its
609      // particular spelling may participate in other driver choices.
610      llvm::Triple::ArchType Arch =
611        llvm::Triple::getArchTypeForDarwinArchName(A->getValue(Args));
612      if (Arch == llvm::Triple::UnknownArch) {
613        Diag(clang::diag::err_drv_invalid_arch_name)
614          << A->getAsString(Args);
615        continue;
616      }
617
618      A->claim();
619      if (ArchNames.insert(A->getValue(Args)))
620        Archs.push_back(A->getValue(Args));
621    }
622  }
623
624  // When there is no explicit arch for this platform, make sure we still bind
625  // the architecture (to the default) so that -Xarch_ is handled correctly.
626  if (!Archs.size())
627    Archs.push_back(0);
628
629  // FIXME: We killed off some others but these aren't yet detected in a
630  // functional manner. If we added information to jobs about which "auxiliary"
631  // files they wrote then we could detect the conflict these cause downstream.
632  if (Archs.size() > 1) {
633    // No recovery needed, the point of this is just to prevent
634    // overwriting the same files.
635    if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
636      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
637        << A->getAsString(Args);
638  }
639
640  ActionList SingleActions;
641  BuildActions(TC, Args, SingleActions);
642
643  // Add in arch bindings for every top level action, as well as lipo and
644  // dsymutil steps if needed.
645  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
646    Action *Act = SingleActions[i];
647
648    // Make sure we can lipo this kind of output. If not (and it is an actual
649    // output) then we disallow, since we can't create an output file with the
650    // right name without overwriting it. We could remove this oddity by just
651    // changing the output names to include the arch, which would also fix
652    // -save-temps. Compatibility wins for now.
653
654    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
655      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
656        << types::getTypeName(Act->getType());
657
658    ActionList Inputs;
659    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
660      Inputs.push_back(new BindArchAction(Act, Archs[i]));
661      if (i != 0)
662        Inputs.back()->setOwnsInputs(false);
663    }
664
665    // Lipo if necessary, we do it this way because we need to set the arch flag
666    // so that -Xarch_ gets overwritten.
667    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
668      Actions.append(Inputs.begin(), Inputs.end());
669    else
670      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
671
672    // Add a 'dsymutil' step if necessary, when debug info is enabled and we
673    // have a compile input. We need to run 'dsymutil' ourselves in such cases
674    // because the debug info will refer to a temporary object file which is
675    // will be removed at the end of the compilation process.
676    if (Act->getType() == types::TY_Image) {
677      Arg *A = Args.getLastArg(options::OPT_g_Group);
678      if (A && !A->getOption().matches(options::OPT_g0) &&
679          !A->getOption().matches(options::OPT_gstabs) &&
680          ContainsCompileOrAssembleAction(Actions.back())) {
681        ActionList Inputs;
682        Inputs.push_back(Actions.back());
683        Actions.pop_back();
684
685        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
686      }
687    }
688  }
689}
690
691void Driver::BuildActions(const ToolChain &TC, const DerivedArgList &Args,
692                          ActionList &Actions) const {
693  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
694  // Start by constructing the list of inputs and their types.
695
696  // Track the current user specified (-x) input. We also explicitly track the
697  // argument used to set the type; we only want to claim the type when we
698  // actually use it, so we warn about unused -x arguments.
699  types::ID InputType = types::TY_Nothing;
700  Arg *InputTypeArg = 0;
701
702  llvm::SmallVector<std::pair<types::ID, const Arg*>, 16> Inputs;
703  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
704       it != ie; ++it) {
705    Arg *A = *it;
706
707    if (isa<InputOption>(A->getOption())) {
708      const char *Value = A->getValue(Args);
709      types::ID Ty = types::TY_INVALID;
710
711      // Infer the input type if necessary.
712      if (InputType == types::TY_Nothing) {
713        // If there was an explicit arg for this, claim it.
714        if (InputTypeArg)
715          InputTypeArg->claim();
716
717        // stdin must be handled specially.
718        if (memcmp(Value, "-", 2) == 0) {
719          // If running with -E, treat as a C input (this changes the builtin
720          // macros, for example). This may be overridden by -ObjC below.
721          //
722          // Otherwise emit an error but still use a valid type to avoid
723          // spurious errors (e.g., no inputs).
724          if (!Args.hasArgNoClaim(options::OPT_E) && !CCCIsCPP)
725            Diag(clang::diag::err_drv_unknown_stdin_type);
726          Ty = types::TY_C;
727        } else {
728          // Otherwise lookup by extension.
729          // Fallback is C if invoked as C preprocessor or Object otherwise.
730          // We use a host hook here because Darwin at least has its own
731          // idea of what .s is.
732          if (const char *Ext = strrchr(Value, '.'))
733            Ty = TC.LookupTypeForExtension(Ext + 1);
734
735          if (Ty == types::TY_INVALID) {
736            if (CCCIsCPP)
737              Ty = types::TY_C;
738            else
739              Ty = types::TY_Object;
740          }
741
742          // If the driver is invoked as C++ compiler (like clang++ or c++) it
743          // should autodetect some input files as C++ for g++ compatibility.
744          if (CCCIsCXX) {
745            types::ID OldTy = Ty;
746            Ty = types::lookupCXXTypeForCType(Ty);
747
748            if (Ty != OldTy)
749              Diag(clang::diag::warn_drv_treating_input_as_cxx)
750                << getTypeName(OldTy) << getTypeName(Ty);
751          }
752        }
753
754        // -ObjC and -ObjC++ override the default language, but only for "source
755        // files". We just treat everything that isn't a linker input as a
756        // source file.
757        //
758        // FIXME: Clean this up if we move the phase sequence into the type.
759        if (Ty != types::TY_Object) {
760          if (Args.hasArg(options::OPT_ObjC))
761            Ty = types::TY_ObjC;
762          else if (Args.hasArg(options::OPT_ObjCXX))
763            Ty = types::TY_ObjCXX;
764        }
765      } else {
766        assert(InputTypeArg && "InputType set w/o InputTypeArg");
767        InputTypeArg->claim();
768        Ty = InputType;
769      }
770
771      // Check that the file exists, if enabled.
772      if (CheckInputsExist && memcmp(Value, "-", 2) != 0) {
773        llvm::SmallString<64> Path(Value);
774        if (Arg *WorkDir = Args.getLastArg(options::OPT_working_directory))
775          if (llvm::sys::path::is_absolute(Path.str())) {
776            Path = WorkDir->getValue(Args);
777            llvm::sys::path::append(Path, Value);
778          }
779
780        bool exists = false;
781        if (/*error_code ec =*/llvm::sys::fs::exists(Value, exists) || !exists)
782          Diag(clang::diag::err_drv_no_such_file) << Path.str();
783        else
784          Inputs.push_back(std::make_pair(Ty, A));
785      } else
786        Inputs.push_back(std::make_pair(Ty, A));
787
788    } else if (A->getOption().isLinkerInput()) {
789      // Just treat as object type, we could make a special type for this if
790      // necessary.
791      Inputs.push_back(std::make_pair(types::TY_Object, A));
792
793    } else if (A->getOption().matches(options::OPT_x)) {
794      InputTypeArg = A;
795      InputType = types::lookupTypeForTypeSpecifier(A->getValue(Args));
796
797      // Follow gcc behavior and treat as linker input for invalid -x
798      // options. Its not clear why we shouldn't just revert to unknown; but
799      // this isn't very important, we might as well be bug compatible.
800      if (!InputType) {
801        Diag(clang::diag::err_drv_unknown_language) << A->getValue(Args);
802        InputType = types::TY_Object;
803      }
804    }
805  }
806
807  if (CCCIsCPP && Inputs.empty()) {
808    // If called as standalone preprocessor, stdin is processed
809    // if no other input is present.
810    unsigned Index = Args.getBaseArgs().MakeIndex("-");
811    Arg *A = Opts->ParseOneArg(Args, Index);
812    A->claim();
813    Inputs.push_back(std::make_pair(types::TY_C, A));
814  }
815
816  if (!SuppressMissingInputWarning && Inputs.empty()) {
817    Diag(clang::diag::err_drv_no_input_files);
818    return;
819  }
820
821  // Determine which compilation mode we are in. We look for options which
822  // affect the phase, starting with the earliest phases, and record which
823  // option we used to determine the final phase.
824  Arg *FinalPhaseArg = 0;
825  phases::ID FinalPhase;
826
827  // -{E,M,MM} only run the preprocessor.
828  if (CCCIsCPP ||
829      (FinalPhaseArg = Args.getLastArg(options::OPT_E)) ||
830      (FinalPhaseArg = Args.getLastArg(options::OPT_M, options::OPT_MM))) {
831    FinalPhase = phases::Preprocess;
832
833    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
834  } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_fsyntax_only)) ||
835             (FinalPhaseArg = Args.getLastArg(options::OPT_rewrite_objc)) ||
836             (FinalPhaseArg = Args.getLastArg(options::OPT__analyze,
837                                              options::OPT__analyze_auto)) ||
838             (FinalPhaseArg = Args.getLastArg(options::OPT_emit_ast)) ||
839             (FinalPhaseArg = Args.getLastArg(options::OPT_S))) {
840    FinalPhase = phases::Compile;
841
842    // -c only runs up to the assembler.
843  } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_c))) {
844    FinalPhase = phases::Assemble;
845
846    // Otherwise do everything.
847  } else
848    FinalPhase = phases::Link;
849
850  // Reject -Z* at the top level, these options should never have been exposed
851  // by gcc.
852  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
853    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
854
855  // Construct the actions to perform.
856  ActionList LinkerInputs;
857  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
858    types::ID InputType = Inputs[i].first;
859    const Arg *InputArg = Inputs[i].second;
860
861    unsigned NumSteps = types::getNumCompilationPhases(InputType);
862    assert(NumSteps && "Invalid number of steps!");
863
864    // If the first step comes after the final phase we are doing as part of
865    // this compilation, warn the user about it.
866    phases::ID InitialPhase = types::getCompilationPhase(InputType, 0);
867    if (InitialPhase > FinalPhase) {
868      // Claim here to avoid the more general unused warning.
869      InputArg->claim();
870
871      // Suppress all unused style warnings with -Qunused-arguments
872      if (Args.hasArg(options::OPT_Qunused_arguments))
873        continue;
874
875      // Special case '-E' warning on a previously preprocessed file to make
876      // more sense.
877      if (InitialPhase == phases::Compile && FinalPhase == phases::Preprocess &&
878          getPreprocessedType(InputType) == types::TY_INVALID)
879        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
880          << InputArg->getAsString(Args)
881          << FinalPhaseArg->getOption().getName();
882      else
883        Diag(clang::diag::warn_drv_input_file_unused)
884          << InputArg->getAsString(Args)
885          << getPhaseName(InitialPhase)
886          << FinalPhaseArg->getOption().getName();
887      continue;
888    }
889
890    // Build the pipeline for this file.
891    llvm::OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
892    for (unsigned i = 0; i != NumSteps; ++i) {
893      phases::ID Phase = types::getCompilationPhase(InputType, i);
894
895      // We are done if this step is past what the user requested.
896      if (Phase > FinalPhase)
897        break;
898
899      // Queue linker inputs.
900      if (Phase == phases::Link) {
901        assert(i + 1 == NumSteps && "linking must be final compilation step.");
902        LinkerInputs.push_back(Current.take());
903        break;
904      }
905
906      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
907      // encode this in the steps because the intermediate type depends on
908      // arguments. Just special case here.
909      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
910        continue;
911
912      // Otherwise construct the appropriate action.
913      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
914      if (Current->getType() == types::TY_Nothing)
915        break;
916    }
917
918    // If we ended with something, add to the output list.
919    if (Current)
920      Actions.push_back(Current.take());
921  }
922
923  // Add a link action if necessary.
924  if (!LinkerInputs.empty())
925    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
926
927  // If we are linking, claim any options which are obviously only used for
928  // compilation.
929  if (FinalPhase == phases::Link)
930    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
931}
932
933Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
934                                     Action *Input) const {
935  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
936  // Build the appropriate action.
937  switch (Phase) {
938  case phases::Link: assert(0 && "link action invalid here.");
939  case phases::Preprocess: {
940    types::ID OutputTy;
941    // -{M, MM} alter the output type.
942    if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
943      OutputTy = types::TY_Dependencies;
944    } else {
945      OutputTy = types::getPreprocessedType(Input->getType());
946      assert(OutputTy != types::TY_INVALID &&
947             "Cannot preprocess this input type!");
948    }
949    return new PreprocessJobAction(Input, OutputTy);
950  }
951  case phases::Precompile:
952    return new PrecompileJobAction(Input, types::TY_PCH);
953  case phases::Compile: {
954    if (Args.hasArg(options::OPT_fsyntax_only)) {
955      return new CompileJobAction(Input, types::TY_Nothing);
956    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
957      return new CompileJobAction(Input, types::TY_RewrittenObjC);
958    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
959      return new AnalyzeJobAction(Input, types::TY_Plist);
960    } else if (Args.hasArg(options::OPT_emit_ast)) {
961      return new CompileJobAction(Input, types::TY_AST);
962    } else if (IsUsingLTO(Args)) {
963      types::ID Output =
964        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
965      return new CompileJobAction(Input, Output);
966    } else {
967      return new CompileJobAction(Input, types::TY_PP_Asm);
968    }
969  }
970  case phases::Assemble:
971    return new AssembleJobAction(Input, types::TY_Object);
972  }
973
974  assert(0 && "invalid phase in ConstructPhaseAction");
975  return 0;
976}
977
978bool Driver::IsUsingLTO(const ArgList &Args) const {
979  // Check for -emit-llvm or -flto.
980  if (Args.hasArg(options::OPT_emit_llvm) ||
981      Args.hasFlag(options::OPT_flto, options::OPT_fno_lto, false))
982    return true;
983
984  // Check for -O4.
985  if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
986      return A->getOption().matches(options::OPT_O4);
987
988  return false;
989}
990
991void Driver::BuildJobs(Compilation &C) const {
992  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
993
994  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
995
996  // It is an error to provide a -o option if we are making multiple output
997  // files.
998  if (FinalOutput) {
999    unsigned NumOutputs = 0;
1000    for (ActionList::const_iterator it = C.getActions().begin(),
1001           ie = C.getActions().end(); it != ie; ++it)
1002      if ((*it)->getType() != types::TY_Nothing)
1003        ++NumOutputs;
1004
1005    if (NumOutputs > 1) {
1006      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
1007      FinalOutput = 0;
1008    }
1009  }
1010
1011  for (ActionList::const_iterator it = C.getActions().begin(),
1012         ie = C.getActions().end(); it != ie; ++it) {
1013    Action *A = *it;
1014
1015    // If we are linking an image for multiple archs then the linker wants
1016    // -arch_multiple and -final_output <final image name>. Unfortunately, this
1017    // doesn't fit in cleanly because we have to pass this information down.
1018    //
1019    // FIXME: This is a hack; find a cleaner way to integrate this into the
1020    // process.
1021    const char *LinkingOutput = 0;
1022    if (isa<LipoJobAction>(A)) {
1023      if (FinalOutput)
1024        LinkingOutput = FinalOutput->getValue(C.getArgs());
1025      else
1026        LinkingOutput = DefaultImageName.c_str();
1027    }
1028
1029    InputInfo II;
1030    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
1031                       /*BoundArch*/0,
1032                       /*AtTopLevel*/ true,
1033                       /*LinkingOutput*/ LinkingOutput,
1034                       II);
1035  }
1036
1037  // If the user passed -Qunused-arguments or there were errors, don't warn
1038  // about any unused arguments.
1039  if (Diags.hasErrorOccurred() ||
1040      C.getArgs().hasArg(options::OPT_Qunused_arguments))
1041    return;
1042
1043  // Claim -### here.
1044  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
1045
1046  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1047       it != ie; ++it) {
1048    Arg *A = *it;
1049
1050    // FIXME: It would be nice to be able to send the argument to the
1051    // Diagnostic, so that extra values, position, and so on could be printed.
1052    if (!A->isClaimed()) {
1053      if (A->getOption().hasNoArgumentUnused())
1054        continue;
1055
1056      // Suppress the warning automatically if this is just a flag, and it is an
1057      // instance of an argument we already claimed.
1058      const Option &Opt = A->getOption();
1059      if (isa<FlagOption>(Opt)) {
1060        bool DuplicateClaimed = false;
1061
1062        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
1063               ie = C.getArgs().filtered_end(); it != ie; ++it) {
1064          if ((*it)->isClaimed()) {
1065            DuplicateClaimed = true;
1066            break;
1067          }
1068        }
1069
1070        if (DuplicateClaimed)
1071          continue;
1072      }
1073
1074      Diag(clang::diag::warn_drv_unused_argument)
1075        << A->getAsString(C.getArgs());
1076    }
1077  }
1078}
1079
1080static const Tool &SelectToolForJob(Compilation &C, const ToolChain *TC,
1081                                    const JobAction *JA,
1082                                    const ActionList *&Inputs) {
1083  const Tool *ToolForJob = 0;
1084
1085  // See if we should look for a compiler with an integrated assembler. We match
1086  // bottom up, so what we are actually looking for is an assembler job with a
1087  // compiler input.
1088
1089  // FIXME: This doesn't belong here, but ideally we will support static soon
1090  // anyway.
1091  bool HasStatic = (C.getArgs().hasArg(options::OPT_mkernel) ||
1092                    C.getArgs().hasArg(options::OPT_static) ||
1093                    C.getArgs().hasArg(options::OPT_fapple_kext));
1094  bool IsDarwin = TC->getTriple().getOS() == llvm::Triple::Darwin;
1095  bool IsIADefault = TC->IsIntegratedAssemblerDefault() &&
1096    !(HasStatic && IsDarwin);
1097  if (C.getArgs().hasFlag(options::OPT_integrated_as,
1098                         options::OPT_no_integrated_as,
1099                         IsIADefault) &&
1100      !C.getArgs().hasArg(options::OPT_save_temps) &&
1101      isa<AssembleJobAction>(JA) &&
1102      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1103    const Tool &Compiler = TC->SelectTool(
1104      C, cast<JobAction>(**Inputs->begin()), (*Inputs)[0]->getInputs());
1105    if (Compiler.hasIntegratedAssembler()) {
1106      Inputs = &(*Inputs)[0]->getInputs();
1107      ToolForJob = &Compiler;
1108    }
1109  }
1110
1111  // Otherwise use the tool for the current job.
1112  if (!ToolForJob)
1113    ToolForJob = &TC->SelectTool(C, *JA, *Inputs);
1114
1115  // See if we should use an integrated preprocessor. We do so when we have
1116  // exactly one input, since this is the only use case we care about
1117  // (irrelevant since we don't support combine yet).
1118  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1119      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1120      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1121      !C.getArgs().hasArg(options::OPT_save_temps) &&
1122      ToolForJob->hasIntegratedCPP())
1123    Inputs = &(*Inputs)[0]->getInputs();
1124
1125  return *ToolForJob;
1126}
1127
1128void Driver::BuildJobsForAction(Compilation &C,
1129                                const Action *A,
1130                                const ToolChain *TC,
1131                                const char *BoundArch,
1132                                bool AtTopLevel,
1133                                const char *LinkingOutput,
1134                                InputInfo &Result) const {
1135  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1136
1137  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1138    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1139    // just using Args was better?
1140    const Arg &Input = IA->getInputArg();
1141    Input.claim();
1142    if (Input.getOption().matches(options::OPT_INPUT)) {
1143      const char *Name = Input.getValue(C.getArgs());
1144      Result = InputInfo(Name, A->getType(), Name);
1145    } else
1146      Result = InputInfo(&Input, A->getType(), "");
1147    return;
1148  }
1149
1150  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1151    const ToolChain *TC = &C.getDefaultToolChain();
1152
1153    std::string Arch;
1154    if (BAA->getArchName())
1155      TC = Host->CreateToolChain(C.getArgs(), BAA->getArchName());
1156
1157    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1158                       AtTopLevel, LinkingOutput, Result);
1159    return;
1160  }
1161
1162  const ActionList *Inputs = &A->getInputs();
1163
1164  const JobAction *JA = cast<JobAction>(A);
1165  const Tool &T = SelectToolForJob(C, TC, JA, Inputs);
1166
1167  // Only use pipes when there is exactly one input.
1168  InputInfoList InputInfos;
1169  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1170       it != ie; ++it) {
1171    // Treat dsymutil sub-jobs as being at the top-level too, they shouldn't get
1172    // temporary output names.
1173    //
1174    // FIXME: Clean this up.
1175    bool SubJobAtTopLevel = false;
1176    if (AtTopLevel && isa<DsymutilJobAction>(A))
1177      SubJobAtTopLevel = true;
1178
1179    InputInfo II;
1180    BuildJobsForAction(C, *it, TC, BoundArch,
1181                       SubJobAtTopLevel, LinkingOutput, II);
1182    InputInfos.push_back(II);
1183  }
1184
1185  // Always use the first input as the base input.
1186  const char *BaseInput = InputInfos[0].getBaseInput();
1187
1188  // ... except dsymutil actions, which use their actual input as the base
1189  // input.
1190  if (JA->getType() == types::TY_dSYM)
1191    BaseInput = InputInfos[0].getFilename();
1192
1193  // Determine the place to write output to, if any.
1194  if (JA->getType() == types::TY_Nothing) {
1195    Result = InputInfo(A->getType(), BaseInput);
1196  } else {
1197    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, AtTopLevel),
1198                       A->getType(), BaseInput);
1199  }
1200
1201  if (CCCPrintBindings) {
1202    llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
1203                 << " - \"" << T.getName() << "\", inputs: [";
1204    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1205      llvm::errs() << InputInfos[i].getAsString();
1206      if (i + 1 != e)
1207        llvm::errs() << ", ";
1208    }
1209    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1210  } else {
1211    T.ConstructJob(C, *JA, Result, InputInfos,
1212                   C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1213  }
1214}
1215
1216const char *Driver::GetNamedOutputPath(Compilation &C,
1217                                       const JobAction &JA,
1218                                       const char *BaseInput,
1219                                       bool AtTopLevel) const {
1220  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1221  // Output to a user requested destination?
1222  if (AtTopLevel && !isa<DsymutilJobAction>(JA)) {
1223    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1224      return C.addResultFile(FinalOutput->getValue(C.getArgs()));
1225  }
1226
1227  // Default to writing to stdout?
1228  if (AtTopLevel && isa<PreprocessJobAction>(JA))
1229    return "-";
1230
1231  // Output to a temporary file?
1232  if (!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) {
1233    std::string TmpName =
1234      GetTemporaryPath(types::getTypeTempSuffix(JA.getType()));
1235    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1236  }
1237
1238  llvm::SmallString<128> BasePath(BaseInput);
1239  llvm::StringRef BaseName;
1240
1241  // Dsymutil actions should use the full path.
1242  if (isa<DsymutilJobAction>(JA))
1243    BaseName = BasePath;
1244  else
1245    BaseName = llvm::sys::path::filename(BasePath);
1246
1247  // Determine what the derived output name should be.
1248  const char *NamedOutput;
1249  if (JA.getType() == types::TY_Image) {
1250    NamedOutput = DefaultImageName.c_str();
1251  } else {
1252    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1253    assert(Suffix && "All types used for output should have a suffix.");
1254
1255    std::string::size_type End = std::string::npos;
1256    if (!types::appendSuffixForType(JA.getType()))
1257      End = BaseName.rfind('.');
1258    std::string Suffixed(BaseName.substr(0, End));
1259    Suffixed += '.';
1260    Suffixed += Suffix;
1261    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1262  }
1263
1264  // If we're saving temps and the temp filename conflicts with the input
1265  // filename, then avoid overwriting input file.
1266  if (!AtTopLevel && C.getArgs().hasArg(options::OPT_save_temps) &&
1267    NamedOutput == BaseName) {
1268    std::string TmpName =
1269      GetTemporaryPath(types::getTypeTempSuffix(JA.getType()));
1270    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1271  }
1272
1273  // As an annoying special case, PCH generation doesn't strip the pathname.
1274  if (JA.getType() == types::TY_PCH) {
1275    llvm::sys::path::remove_filename(BasePath);
1276    if (BasePath.empty())
1277      BasePath = NamedOutput;
1278    else
1279      llvm::sys::path::append(BasePath, NamedOutput);
1280    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()));
1281  } else {
1282    return C.addResultFile(NamedOutput);
1283  }
1284}
1285
1286std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1287  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1288  // attempting to use this prefix when lokup up program paths.
1289  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1290       ie = PrefixDirs.end(); it != ie; ++it) {
1291    std::string Dir(*it);
1292    if (Dir.empty())
1293      continue;
1294    if (Dir[0] == '=')
1295      Dir = SysRoot + Dir.substr(1);
1296    llvm::sys::Path P(Dir);
1297    P.appendComponent(Name);
1298    bool Exists;
1299    if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1300      return P.str();
1301  }
1302
1303  const ToolChain::path_list &List = TC.getFilePaths();
1304  for (ToolChain::path_list::const_iterator
1305         it = List.begin(), ie = List.end(); it != ie; ++it) {
1306    std::string Dir(*it);
1307    if (Dir.empty())
1308      continue;
1309    if (Dir[0] == '=')
1310      Dir = SysRoot + Dir.substr(1);
1311    llvm::sys::Path P(Dir);
1312    P.appendComponent(Name);
1313    bool Exists;
1314    if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1315      return P.str();
1316  }
1317
1318  return Name;
1319}
1320
1321std::string Driver::GetProgramPath(const char *Name, const ToolChain &TC,
1322                                   bool WantFile) const {
1323  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1324  // attempting to use this prefix when lokup up program paths.
1325  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1326       ie = PrefixDirs.end(); it != ie; ++it) {
1327    llvm::sys::Path P(*it);
1328    P.appendComponent(Name);
1329    bool Exists;
1330    if (WantFile ? !llvm::sys::fs::exists(P.str(), Exists) && Exists
1331                 : P.canExecute())
1332      return P.str();
1333  }
1334
1335  const ToolChain::path_list &List = TC.getProgramPaths();
1336  for (ToolChain::path_list::const_iterator
1337         it = List.begin(), ie = List.end(); it != ie; ++it) {
1338    llvm::sys::Path P(*it);
1339    P.appendComponent(Name);
1340    bool Exists;
1341    if (WantFile ? !llvm::sys::fs::exists(P.str(), Exists) && Exists
1342                 : P.canExecute())
1343      return P.str();
1344  }
1345
1346  // If all else failed, search the path.
1347  llvm::sys::Path P(llvm::sys::Program::FindProgramByName(Name));
1348  if (!P.empty())
1349    return P.str();
1350
1351  return Name;
1352}
1353
1354std::string Driver::GetTemporaryPath(const char *Suffix) const {
1355  // FIXME: This is lame; sys::Path should provide this function (in particular,
1356  // it should know how to find the temporary files dir).
1357  std::string Error;
1358  const char *TmpDir = ::getenv("TMPDIR");
1359  if (!TmpDir)
1360    TmpDir = ::getenv("TEMP");
1361  if (!TmpDir)
1362    TmpDir = ::getenv("TMP");
1363  if (!TmpDir)
1364    TmpDir = "/tmp";
1365  llvm::sys::Path P(TmpDir);
1366  P.appendComponent("cc");
1367  if (P.makeUnique(false, &Error)) {
1368    Diag(clang::diag::err_drv_unable_to_make_temp) << Error;
1369    return "";
1370  }
1371
1372  // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
1373  P.eraseFromDisk(false, 0);
1374
1375  P.appendSuffix(Suffix);
1376  return P.str();
1377}
1378
1379const HostInfo *Driver::GetHostInfo(const char *TripleStr) const {
1380  llvm::PrettyStackTraceString CrashInfo("Constructing host");
1381  llvm::Triple Triple(llvm::Triple::normalize(TripleStr).c_str());
1382
1383  // TCE is an osless target
1384  if (Triple.getArchName() == "tce")
1385    return createTCEHostInfo(*this, Triple);
1386
1387  switch (Triple.getOS()) {
1388  case llvm::Triple::AuroraUX:
1389    return createAuroraUXHostInfo(*this, Triple);
1390  case llvm::Triple::Darwin:
1391    return createDarwinHostInfo(*this, Triple);
1392  case llvm::Triple::DragonFly:
1393    return createDragonFlyHostInfo(*this, Triple);
1394  case llvm::Triple::OpenBSD:
1395    return createOpenBSDHostInfo(*this, Triple);
1396  case llvm::Triple::NetBSD:
1397    return createNetBSDHostInfo(*this, Triple);
1398  case llvm::Triple::FreeBSD:
1399    return createFreeBSDHostInfo(*this, Triple);
1400  case llvm::Triple::Minix:
1401    return createMinixHostInfo(*this, Triple);
1402  case llvm::Triple::Linux:
1403    return createLinuxHostInfo(*this, Triple);
1404  case llvm::Triple::Win32:
1405    return createWindowsHostInfo(*this, Triple);
1406  case llvm::Triple::MinGW32:
1407    return createMinGWHostInfo(*this, Triple);
1408  default:
1409    return createUnknownHostInfo(*this, Triple);
1410  }
1411}
1412
1413bool Driver::ShouldUseClangCompiler(const Compilation &C, const JobAction &JA,
1414                                    const llvm::Triple &Triple) const {
1415  // Check if user requested no clang, or clang doesn't understand this type (we
1416  // only handle single inputs for now).
1417  if (!CCCUseClang || JA.size() != 1 ||
1418      !types::isAcceptedByClang((*JA.begin())->getType()))
1419    return false;
1420
1421  // Otherwise make sure this is an action clang understands.
1422  if (isa<PreprocessJobAction>(JA)) {
1423    if (!CCCUseClangCPP) {
1424      Diag(clang::diag::warn_drv_not_using_clang_cpp);
1425      return false;
1426    }
1427  } else if (!isa<PrecompileJobAction>(JA) && !isa<CompileJobAction>(JA))
1428    return false;
1429
1430  // Use clang for C++?
1431  if (!CCCUseClangCXX && types::isCXX((*JA.begin())->getType())) {
1432    Diag(clang::diag::warn_drv_not_using_clang_cxx);
1433    return false;
1434  }
1435
1436  // Always use clang for precompiling, AST generation, and rewriting,
1437  // regardless of archs.
1438  if (isa<PrecompileJobAction>(JA) ||
1439      types::isOnlyAcceptedByClang(JA.getType()))
1440    return true;
1441
1442  // Finally, don't use clang if this isn't one of the user specified archs to
1443  // build.
1444  if (!CCCClangArchs.empty() && !CCCClangArchs.count(Triple.getArch())) {
1445    Diag(clang::diag::warn_drv_not_using_clang_arch) << Triple.getArchName();
1446    return false;
1447  }
1448
1449  return true;
1450}
1451
1452/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1453/// grouped values as integers. Numbers which are not provided are set to 0.
1454///
1455/// \return True if the entire string was parsed (9.2), or all groups were
1456/// parsed (10.3.5extrastuff).
1457bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1458                               unsigned &Minor, unsigned &Micro,
1459                               bool &HadExtra) {
1460  HadExtra = false;
1461
1462  Major = Minor = Micro = 0;
1463  if (*Str == '\0')
1464    return true;
1465
1466  char *End;
1467  Major = (unsigned) strtol(Str, &End, 10);
1468  if (*Str != '\0' && *End == '\0')
1469    return true;
1470  if (*End != '.')
1471    return false;
1472
1473  Str = End+1;
1474  Minor = (unsigned) strtol(Str, &End, 10);
1475  if (*Str != '\0' && *End == '\0')
1476    return true;
1477  if (*End != '.')
1478    return false;
1479
1480  Str = End+1;
1481  Micro = (unsigned) strtol(Str, &End, 10);
1482  if (*Str != '\0' && *End == '\0')
1483    return true;
1484  if (Str == End)
1485    return false;
1486  HadExtra = true;
1487  return true;
1488}
1489