Driver.cpp revision 9fcbc050a704cc5bb46e1c493940aca7c79aebf9 
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/ADT/StringSet.h"
29#include "llvm/ADT/OwningPtr.h"
30#include "llvm/Support/PrettyStackTrace.h"
31#include "llvm/Support/raw_ostream.h"
32#include "llvm/System/Path.h"
33#include "llvm/System/Program.h"
34
35#include "InputInfo.h"
36
37#include <map>
38
39using namespace clang::driver;
40using namespace clang;
41
42// Used to set values for "production" clang, for releases.
43// #define USE_PRODUCTION_CLANG
44
45Driver::Driver(llvm::StringRef _Name, llvm::StringRef _Dir,
46               llvm::StringRef _DefaultHostTriple,
47               llvm::StringRef _DefaultImageName,
48               bool IsProduction, bool CXXIsProduction,
49               Diagnostic &_Diags)
50  : Opts(createDriverOptTable()), Diags(_Diags),
51    Name(_Name), Dir(_Dir), DefaultHostTriple(_DefaultHostTriple),
52    DefaultImageName(_DefaultImageName),
53    DriverTitle("clang \"gcc-compatible\" driver"),
54    Host(0),
55    CCCGenericGCCName("gcc"), CCPrintOptionsFilename(0), CCCIsCXX(false),
56    CCCEcho(false), CCCPrintBindings(false), CCPrintOptions(false),
57    CheckInputsExist(true), CCCUseClang(true), CCCUseClangCXX(true),
58    CCCUseClangCPP(true), CCCUsePCH(true), SuppressMissingInputWarning(false) {
59  if (IsProduction) {
60    // In a "production" build, only use clang on architectures we expect to
61    // work, and don't use clang C++.
62    //
63    // During development its more convenient to always have the driver use
64    // clang, but we don't want users to be confused when things don't work, or
65    // to file bugs for things we don't support.
66    CCCClangArchs.insert(llvm::Triple::x86);
67    CCCClangArchs.insert(llvm::Triple::x86_64);
68    CCCClangArchs.insert(llvm::Triple::arm);
69
70    if (!CXXIsProduction)
71      CCCUseClangCXX = false;
72  }
73
74  // Compute the path to the resource directory.
75  llvm::sys::Path P(Dir);
76  P.eraseComponent(); // Remove /bin from foo/bin
77  P.appendComponent("lib");
78  P.appendComponent("clang");
79  P.appendComponent(CLANG_VERSION_STRING);
80  ResourceDir = P.str();
81}
82
83Driver::~Driver() {
84  delete Opts;
85  delete Host;
86}
87
88InputArgList *Driver::ParseArgStrings(const char **ArgBegin,
89                                      const char **ArgEnd) {
90  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
91  unsigned MissingArgIndex, MissingArgCount;
92  InputArgList *Args = getOpts().ParseArgs(ArgBegin, ArgEnd,
93                                           MissingArgIndex, MissingArgCount);
94
95  // Check for missing argument error.
96  if (MissingArgCount)
97    Diag(clang::diag::err_drv_missing_argument)
98      << Args->getArgString(MissingArgIndex) << MissingArgCount;
99
100  // Check for unsupported options.
101  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
102       it != ie; ++it) {
103    Arg *A = *it;
104    if (A->getOption().isUnsupported()) {
105      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
106      continue;
107    }
108  }
109
110  return Args;
111}
112
113Compilation *Driver::BuildCompilation(int argc, const char **argv) {
114  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
115
116  // FIXME: Handle environment options which effect driver behavior, somewhere
117  // (client?). GCC_EXEC_PREFIX, COMPILER_PATH, LIBRARY_PATH, LPATH,
118  // CC_PRINT_OPTIONS.
119
120  // FIXME: What are we going to do with -V and -b?
121
122  // FIXME: This stuff needs to go into the Compilation, not the driver.
123  bool CCCPrintOptions = false, CCCPrintActions = false;
124
125  const char **Start = argv + 1, **End = argv + argc;
126  const char *HostTriple = DefaultHostTriple.c_str();
127
128  InputArgList *Args = ParseArgStrings(Start, End);
129
130  // -no-canonical-prefixes is used very early in main.
131  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
132
133  // Extract -ccc args.
134  //
135  // FIXME: We need to figure out where this behavior should live. Most of it
136  // should be outside in the client; the parts that aren't should have proper
137  // options, either by introducing new ones or by overloading gcc ones like -V
138  // or -b.
139  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
140  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
141  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
142  CCCIsCXX = Args->hasArg(options::OPT_ccc_cxx) || CCCIsCXX;
143  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
144  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
145    CCCGenericGCCName = A->getValue(*Args);
146  CCCUseClangCXX = Args->hasFlag(options::OPT_ccc_clang_cxx,
147                                 options::OPT_ccc_no_clang_cxx,
148                                 CCCUseClangCXX);
149  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
150                            options::OPT_ccc_pch_is_pth);
151  CCCUseClang = !Args->hasArg(options::OPT_ccc_no_clang);
152  CCCUseClangCPP = !Args->hasArg(options::OPT_ccc_no_clang_cpp);
153  if (const Arg *A = Args->getLastArg(options::OPT_ccc_clang_archs)) {
154    llvm::StringRef Cur = A->getValue(*Args);
155
156    CCCClangArchs.clear();
157    while (!Cur.empty()) {
158      std::pair<llvm::StringRef, llvm::StringRef> Split = Cur.split(',');
159
160      if (!Split.first.empty()) {
161        llvm::Triple::ArchType Arch =
162          llvm::Triple(Split.first, "", "").getArch();
163
164        if (Arch == llvm::Triple::UnknownArch)
165          Diag(clang::diag::err_drv_invalid_arch_name) << Split.first;
166
167        CCCClangArchs.insert(Arch);
168      }
169
170      Cur = Split.second;
171    }
172  }
173  if (const Arg *A = Args->getLastArg(options::OPT_ccc_host_triple))
174    HostTriple = A->getValue(*Args);
175  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
176    Dir = A->getValue(*Args);
177  if (const Arg *A = Args->getLastArg(options::OPT_B))
178    PrefixDir = A->getValue(*Args);
179
180  Host = GetHostInfo(HostTriple);
181
182  // The compilation takes ownership of Args.
183  Compilation *C = new Compilation(*this, *Host->CreateToolChain(*Args), Args);
184
185  // FIXME: This behavior shouldn't be here.
186  if (CCCPrintOptions) {
187    PrintOptions(C->getArgs());
188    return C;
189  }
190
191  if (!HandleImmediateArgs(*C))
192    return C;
193
194  // Construct the list of abstract actions to perform for this compilation. We
195  // avoid passing a Compilation here simply to enforce the abstraction that
196  // pipelining is not host or toolchain dependent (other than the driver driver
197  // test).
198  if (Host->useDriverDriver())
199    BuildUniversalActions(C->getArgs(), C->getActions());
200  else
201    BuildActions(C->getArgs(), C->getActions());
202
203  if (CCCPrintActions) {
204    PrintActions(*C);
205    return C;
206  }
207
208  BuildJobs(*C);
209
210  return C;
211}
212
213int Driver::ExecuteCompilation(const Compilation &C) const {
214  // Just print if -### was present.
215  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
216    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
217    return 0;
218  }
219
220  // If there were errors building the compilation, quit now.
221  if (getDiags().getNumErrors())
222    return 1;
223
224  const Command *FailingCommand = 0;
225  int Res = C.ExecuteJob(C.getJobs(), FailingCommand);
226
227  // Remove temp files.
228  C.CleanupFileList(C.getTempFiles());
229
230  // If the command succeeded, we are done.
231  if (Res == 0)
232    return Res;
233
234  // Otherwise, remove result files as well.
235  if (!C.getArgs().hasArg(options::OPT_save_temps))
236    C.CleanupFileList(C.getResultFiles(), true);
237
238  // Print extra information about abnormal failures, if possible.
239  //
240  // This is ad-hoc, but we don't want to be excessively noisy. If the result
241  // status was 1, assume the command failed normally. In particular, if it was
242  // the compiler then assume it gave a reasonable error code. Failures in other
243  // tools are less common, and they generally have worse diagnostics, so always
244  // print the diagnostic there.
245  const Tool &FailingTool = FailingCommand->getCreator();
246
247  if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
248    // FIXME: See FIXME above regarding result code interpretation.
249    if (Res < 0)
250      Diag(clang::diag::err_drv_command_signalled)
251        << FailingTool.getShortName() << -Res;
252    else
253      Diag(clang::diag::err_drv_command_failed)
254        << FailingTool.getShortName() << Res;
255  }
256
257  return Res;
258}
259
260void Driver::PrintOptions(const ArgList &Args) const {
261  unsigned i = 0;
262  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
263       it != ie; ++it, ++i) {
264    Arg *A = *it;
265    llvm::errs() << "Option " << i << " - "
266                 << "Name: \"" << A->getOption().getName() << "\", "
267                 << "Values: {";
268    for (unsigned j = 0; j < A->getNumValues(); ++j) {
269      if (j)
270        llvm::errs() << ", ";
271      llvm::errs() << '"' << A->getValue(Args, j) << '"';
272    }
273    llvm::errs() << "}\n";
274  }
275}
276
277// FIXME: Move -ccc options to real options in the .td file (or eliminate), and
278// then move to using OptTable::PrintHelp.
279void Driver::PrintHelp(bool ShowHidden) const {
280  getOpts().PrintHelp(llvm::outs(), Name.c_str(), DriverTitle.c_str(),
281                      ShowHidden);
282}
283
284void Driver::PrintVersion(const Compilation &C, llvm::raw_ostream &OS) const {
285  // FIXME: The following handlers should use a callback mechanism, we don't
286  // know what the client would like to do.
287  OS << getClangFullVersion() << '\n';
288  const ToolChain &TC = C.getDefaultToolChain();
289  OS << "Target: " << TC.getTripleString() << '\n';
290
291  // Print the threading model.
292  //
293  // FIXME: Implement correctly.
294  OS << "Thread model: " << "posix" << '\n';
295}
296
297/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
298/// option.
299static void PrintDiagnosticCategories(llvm::raw_ostream &OS) {
300  for (unsigned i = 1; // Skip the empty category.
301       const char *CategoryName = Diagnostic::getCategoryNameFromID(i); ++i)
302    OS << i << ',' << CategoryName << '\n';
303}
304
305bool Driver::HandleImmediateArgs(const Compilation &C) {
306  // The order these options are handled in in gcc is all over the place, but we
307  // don't expect inconsistencies w.r.t. that to matter in practice.
308
309  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
310    llvm::outs() << CLANG_VERSION_STRING "\n";
311    return false;
312  }
313
314  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
315    PrintDiagnosticCategories(llvm::outs());
316    return false;
317  }
318
319  if (C.getArgs().hasArg(options::OPT__help) ||
320      C.getArgs().hasArg(options::OPT__help_hidden)) {
321    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
322    return false;
323  }
324
325  if (C.getArgs().hasArg(options::OPT__version)) {
326    // Follow gcc behavior and use stdout for --version and stderr for -v.
327    PrintVersion(C, llvm::outs());
328    return false;
329  }
330
331  if (C.getArgs().hasArg(options::OPT_v) ||
332      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
333    PrintVersion(C, llvm::errs());
334    SuppressMissingInputWarning = true;
335  }
336
337  const ToolChain &TC = C.getDefaultToolChain();
338  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
339    llvm::outs() << "programs: =";
340    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
341           ie = TC.getProgramPaths().end(); it != ie; ++it) {
342      if (it != TC.getProgramPaths().begin())
343        llvm::outs() << ':';
344      llvm::outs() << *it;
345    }
346    llvm::outs() << "\n";
347    llvm::outs() << "libraries: =";
348    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
349           ie = TC.getFilePaths().end(); it != ie; ++it) {
350      if (it != TC.getFilePaths().begin())
351        llvm::outs() << ':';
352      llvm::outs() << *it;
353    }
354    llvm::outs() << "\n";
355    return false;
356  }
357
358  // FIXME: The following handlers should use a callback mechanism, we don't
359  // know what the client would like to do.
360  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
361    llvm::outs() << GetFilePath(A->getValue(C.getArgs()), TC) << "\n";
362    return false;
363  }
364
365  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
366    llvm::outs() << GetProgramPath(A->getValue(C.getArgs()), TC) << "\n";
367    return false;
368  }
369
370  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
371    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
372    return false;
373  }
374
375  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
376    // FIXME: We need tool chain support for this.
377    llvm::outs() << ".;\n";
378
379    switch (C.getDefaultToolChain().getTriple().getArch()) {
380    default:
381      break;
382
383    case llvm::Triple::x86_64:
384      llvm::outs() << "x86_64;@m64" << "\n";
385      break;
386
387    case llvm::Triple::ppc64:
388      llvm::outs() << "ppc64;@m64" << "\n";
389      break;
390    }
391    return false;
392  }
393
394  // FIXME: What is the difference between print-multi-directory and
395  // print-multi-os-directory?
396  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
397      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
398    switch (C.getDefaultToolChain().getTriple().getArch()) {
399    default:
400    case llvm::Triple::x86:
401    case llvm::Triple::ppc:
402      llvm::outs() << "." << "\n";
403      break;
404
405    case llvm::Triple::x86_64:
406      llvm::outs() << "x86_64" << "\n";
407      break;
408
409    case llvm::Triple::ppc64:
410      llvm::outs() << "ppc64" << "\n";
411      break;
412    }
413    return false;
414  }
415
416  return true;
417}
418
419static unsigned PrintActions1(const Compilation &C, Action *A,
420                              std::map<Action*, unsigned> &Ids) {
421  if (Ids.count(A))
422    return Ids[A];
423
424  std::string str;
425  llvm::raw_string_ostream os(str);
426
427  os << Action::getClassName(A->getKind()) << ", ";
428  if (InputAction *IA = dyn_cast<InputAction>(A)) {
429    os << "\"" << IA->getInputArg().getValue(C.getArgs()) << "\"";
430  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
431    os << '"' << (BIA->getArchName() ? BIA->getArchName() :
432                  C.getDefaultToolChain().getArchName()) << '"'
433       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
434  } else {
435    os << "{";
436    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
437      os << PrintActions1(C, *it, Ids);
438      ++it;
439      if (it != ie)
440        os << ", ";
441    }
442    os << "}";
443  }
444
445  unsigned Id = Ids.size();
446  Ids[A] = Id;
447  llvm::errs() << Id << ": " << os.str() << ", "
448               << types::getTypeName(A->getType()) << "\n";
449
450  return Id;
451}
452
453void Driver::PrintActions(const Compilation &C) const {
454  std::map<Action*, unsigned> Ids;
455  for (ActionList::const_iterator it = C.getActions().begin(),
456         ie = C.getActions().end(); it != ie; ++it)
457    PrintActions1(C, *it, Ids);
458}
459
460void Driver::BuildUniversalActions(const ArgList &Args,
461                                   ActionList &Actions) const {
462  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
463  // Collect the list of architectures. Duplicates are allowed, but should only
464  // be handled once (in the order seen).
465  llvm::StringSet<> ArchNames;
466  llvm::SmallVector<const char *, 4> Archs;
467  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
468       it != ie; ++it) {
469    Arg *A = *it;
470
471    if (A->getOption().matches(options::OPT_arch)) {
472      // Validate the option here; we don't save the type here because its
473      // particular spelling may participate in other driver choices.
474      llvm::Triple::ArchType Arch =
475        llvm::Triple::getArchTypeForDarwinArchName(A->getValue(Args));
476      if (Arch == llvm::Triple::UnknownArch) {
477        Diag(clang::diag::err_drv_invalid_arch_name)
478          << A->getAsString(Args);
479        continue;
480      }
481
482      A->claim();
483      if (ArchNames.insert(A->getValue(Args)))
484        Archs.push_back(A->getValue(Args));
485    }
486  }
487
488  // When there is no explicit arch for this platform, make sure we still bind
489  // the architecture (to the default) so that -Xarch_ is handled correctly.
490  if (!Archs.size())
491    Archs.push_back(0);
492
493  // FIXME: We killed off some others but these aren't yet detected in a
494  // functional manner. If we added information to jobs about which "auxiliary"
495  // files they wrote then we could detect the conflict these cause downstream.
496  if (Archs.size() > 1) {
497    // No recovery needed, the point of this is just to prevent
498    // overwriting the same files.
499    if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
500      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
501        << A->getAsString(Args);
502  }
503
504  ActionList SingleActions;
505  BuildActions(Args, SingleActions);
506
507  // Add in arch binding and lipo (if necessary) for every top level action.
508  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
509    Action *Act = SingleActions[i];
510
511    // Make sure we can lipo this kind of output. If not (and it is an actual
512    // output) then we disallow, since we can't create an output file with the
513    // right name without overwriting it. We could remove this oddity by just
514    // changing the output names to include the arch, which would also fix
515    // -save-temps. Compatibility wins for now.
516
517    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
518      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
519        << types::getTypeName(Act->getType());
520
521    ActionList Inputs;
522    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
523      Inputs.push_back(new BindArchAction(Act, Archs[i]));
524      if (i != 0)
525        Inputs.back()->setOwnsInputs(false);
526    }
527
528    // Lipo if necessary, we do it this way because we need to set the arch flag
529    // so that -Xarch_ gets overwritten.
530    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
531      Actions.append(Inputs.begin(), Inputs.end());
532    else
533      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
534  }
535}
536
537void Driver::BuildActions(const ArgList &Args, ActionList &Actions) const {
538  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
539  // Start by constructing the list of inputs and their types.
540
541  // Track the current user specified (-x) input. We also explicitly track the
542  // argument used to set the type; we only want to claim the type when we
543  // actually use it, so we warn about unused -x arguments.
544  types::ID InputType = types::TY_Nothing;
545  Arg *InputTypeArg = 0;
546
547  llvm::SmallVector<std::pair<types::ID, const Arg*>, 16> Inputs;
548  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
549       it != ie; ++it) {
550    Arg *A = *it;
551
552    if (isa<InputOption>(A->getOption())) {
553      const char *Value = A->getValue(Args);
554      types::ID Ty = types::TY_INVALID;
555
556      // Infer the input type if necessary.
557      if (InputType == types::TY_Nothing) {
558        // If there was an explicit arg for this, claim it.
559        if (InputTypeArg)
560          InputTypeArg->claim();
561
562        // stdin must be handled specially.
563        if (memcmp(Value, "-", 2) == 0) {
564          // If running with -E, treat as a C input (this changes the builtin
565          // macros, for example). This may be overridden by -ObjC below.
566          //
567          // Otherwise emit an error but still use a valid type to avoid
568          // spurious errors (e.g., no inputs).
569          if (!Args.hasArgNoClaim(options::OPT_E))
570            Diag(clang::diag::err_drv_unknown_stdin_type);
571          Ty = types::TY_C;
572        } else {
573          // Otherwise lookup by extension, and fallback to ObjectType if not
574          // found. We use a host hook here because Darwin at least has its own
575          // idea of what .s is.
576          if (const char *Ext = strrchr(Value, '.'))
577            Ty = Host->lookupTypeForExtension(Ext + 1);
578
579          if (Ty == types::TY_INVALID)
580            Ty = types::TY_Object;
581
582          // If the driver is invoked as C++ compiler (like clang++ or c++) it
583          // should autodetect some input files as C++ for g++ compatibility.
584          if (CCCIsCXX) {
585            types::ID OldTy = Ty;
586            Ty = types::lookupCXXTypeForCType(Ty);
587
588            if (Ty != OldTy)
589              Diag(clang::diag::warn_drv_treating_input_as_cxx)
590                << getTypeName(OldTy) << getTypeName(Ty);
591          }
592        }
593
594        // -ObjC and -ObjC++ override the default language, but only for "source
595        // files". We just treat everything that isn't a linker input as a
596        // source file.
597        //
598        // FIXME: Clean this up if we move the phase sequence into the type.
599        if (Ty != types::TY_Object) {
600          if (Args.hasArg(options::OPT_ObjC))
601            Ty = types::TY_ObjC;
602          else if (Args.hasArg(options::OPT_ObjCXX))
603            Ty = types::TY_ObjCXX;
604        }
605      } else {
606        assert(InputTypeArg && "InputType set w/o InputTypeArg");
607        InputTypeArg->claim();
608        Ty = InputType;
609      }
610
611      // Check that the file exists, if enabled.
612      if (CheckInputsExist && memcmp(Value, "-", 2) != 0 &&
613          !llvm::sys::Path(Value).exists())
614        Diag(clang::diag::err_drv_no_such_file) << A->getValue(Args);
615      else
616        Inputs.push_back(std::make_pair(Ty, A));
617
618    } else if (A->getOption().isLinkerInput()) {
619      // Just treat as object type, we could make a special type for this if
620      // necessary.
621      Inputs.push_back(std::make_pair(types::TY_Object, A));
622
623    } else if (A->getOption().matches(options::OPT_x)) {
624      InputTypeArg = A;
625      InputType = types::lookupTypeForTypeSpecifier(A->getValue(Args));
626
627      // Follow gcc behavior and treat as linker input for invalid -x
628      // options. Its not clear why we shouldn't just revert to unknown; but
629      // this isn't very important, we might as well be bug comatible.
630      if (!InputType) {
631        Diag(clang::diag::err_drv_unknown_language) << A->getValue(Args);
632        InputType = types::TY_Object;
633      }
634    }
635  }
636
637  if (!SuppressMissingInputWarning && Inputs.empty()) {
638    Diag(clang::diag::err_drv_no_input_files);
639    return;
640  }
641
642  // Determine which compilation mode we are in. We look for options which
643  // affect the phase, starting with the earliest phases, and record which
644  // option we used to determine the final phase.
645  Arg *FinalPhaseArg = 0;
646  phases::ID FinalPhase;
647
648  // -{E,M,MM} only run the preprocessor.
649  if ((FinalPhaseArg = Args.getLastArg(options::OPT_E)) ||
650      (FinalPhaseArg = Args.getLastArg(options::OPT_M)) ||
651      (FinalPhaseArg = Args.getLastArg(options::OPT_MM))) {
652    FinalPhase = phases::Preprocess;
653
654    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
655  } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_fsyntax_only)) ||
656             (FinalPhaseArg = Args.getLastArg(options::OPT_rewrite_objc)) ||
657             (FinalPhaseArg = Args.getLastArg(options::OPT__analyze,
658                                              options::OPT__analyze_auto)) ||
659             (FinalPhaseArg = Args.getLastArg(options::OPT_emit_ast)) ||
660             (FinalPhaseArg = Args.getLastArg(options::OPT_S))) {
661    FinalPhase = phases::Compile;
662
663    // -c only runs up to the assembler.
664  } else if ((FinalPhaseArg = Args.getLastArg(options::OPT_c))) {
665    FinalPhase = phases::Assemble;
666
667    // Otherwise do everything.
668  } else
669    FinalPhase = phases::Link;
670
671  // Reject -Z* at the top level, these options should never have been exposed
672  // by gcc.
673  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
674    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
675
676  // Construct the actions to perform.
677  ActionList LinkerInputs;
678  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
679    types::ID InputType = Inputs[i].first;
680    const Arg *InputArg = Inputs[i].second;
681
682    unsigned NumSteps = types::getNumCompilationPhases(InputType);
683    assert(NumSteps && "Invalid number of steps!");
684
685    // If the first step comes after the final phase we are doing as part of
686    // this compilation, warn the user about it.
687    phases::ID InitialPhase = types::getCompilationPhase(InputType, 0);
688    if (InitialPhase > FinalPhase) {
689      // Claim here to avoid the more general unused warning.
690      InputArg->claim();
691
692      // Special case '-E' warning on a previously preprocessed file to make
693      // more sense.
694      if (InitialPhase == phases::Compile && FinalPhase == phases::Preprocess &&
695          getPreprocessedType(InputType) == types::TY_INVALID)
696        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
697          << InputArg->getAsString(Args)
698          << FinalPhaseArg->getOption().getName();
699      else
700        Diag(clang::diag::warn_drv_input_file_unused)
701          << InputArg->getAsString(Args)
702          << getPhaseName(InitialPhase)
703          << FinalPhaseArg->getOption().getName();
704      continue;
705    }
706
707    // Build the pipeline for this file.
708    llvm::OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
709    for (unsigned i = 0; i != NumSteps; ++i) {
710      phases::ID Phase = types::getCompilationPhase(InputType, i);
711
712      // We are done if this step is past what the user requested.
713      if (Phase > FinalPhase)
714        break;
715
716      // Queue linker inputs.
717      if (Phase == phases::Link) {
718        assert(i + 1 == NumSteps && "linking must be final compilation step.");
719        LinkerInputs.push_back(Current.take());
720        break;
721      }
722
723      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
724      // encode this in the steps because the intermediate type depends on
725      // arguments. Just special case here.
726      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
727        continue;
728
729      // Otherwise construct the appropriate action.
730      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
731      if (Current->getType() == types::TY_Nothing)
732        break;
733    }
734
735    // If we ended with something, add to the output list.
736    if (Current)
737      Actions.push_back(Current.take());
738  }
739
740  // Add a link action if necessary.
741  if (!LinkerInputs.empty())
742    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
743
744  // If we are linking, claim any options which are obviously only used for
745  // compilation.
746  if (FinalPhase == phases::Link)
747    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
748}
749
750Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
751                                     Action *Input) const {
752  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
753  // Build the appropriate action.
754  switch (Phase) {
755  case phases::Link: assert(0 && "link action invalid here.");
756  case phases::Preprocess: {
757    types::ID OutputTy;
758    // -{M, MM} alter the output type.
759    if (Args.hasArg(options::OPT_M) || Args.hasArg(options::OPT_MM)) {
760      OutputTy = types::TY_Dependencies;
761    } else {
762      OutputTy = types::getPreprocessedType(Input->getType());
763      assert(OutputTy != types::TY_INVALID &&
764             "Cannot preprocess this input type!");
765    }
766    return new PreprocessJobAction(Input, OutputTy);
767  }
768  case phases::Precompile:
769    return new PrecompileJobAction(Input, types::TY_PCH);
770  case phases::Compile: {
771    bool HasO4 = false;
772    if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
773      HasO4 = A->getOption().matches(options::OPT_O4);
774
775    if (Args.hasArg(options::OPT_fsyntax_only)) {
776      return new CompileJobAction(Input, types::TY_Nothing);
777    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
778      return new CompileJobAction(Input, types::TY_RewrittenObjC);
779    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
780      return new AnalyzeJobAction(Input, types::TY_Plist);
781    } else if (Args.hasArg(options::OPT_emit_ast)) {
782      return new CompileJobAction(Input, types::TY_AST);
783    } else if (Args.hasArg(options::OPT_emit_llvm) ||
784               Args.hasArg(options::OPT_flto) || HasO4) {
785      types::ID Output =
786        Args.hasArg(options::OPT_S) ? types::TY_LLVMAsm : types::TY_LLVMBC;
787      return new CompileJobAction(Input, Output);
788    } else {
789      return new CompileJobAction(Input, types::TY_PP_Asm);
790    }
791  }
792  case phases::Assemble:
793    return new AssembleJobAction(Input, types::TY_Object);
794  }
795
796  assert(0 && "invalid phase in ConstructPhaseAction");
797  return 0;
798}
799
800void Driver::BuildJobs(Compilation &C) const {
801  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
802  bool SaveTemps = C.getArgs().hasArg(options::OPT_save_temps);
803  bool UsePipes = C.getArgs().hasArg(options::OPT_pipe);
804
805  // FIXME: Pipes are forcibly disabled until we support executing them.
806  if (!CCCPrintBindings)
807    UsePipes = false;
808
809  // -save-temps inhibits pipes.
810  if (SaveTemps && UsePipes)
811    Diag(clang::diag::warn_drv_pipe_ignored_with_save_temps);
812
813  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
814
815  // It is an error to provide a -o option if we are making multiple output
816  // files.
817  if (FinalOutput) {
818    unsigned NumOutputs = 0;
819    for (ActionList::const_iterator it = C.getActions().begin(),
820           ie = C.getActions().end(); it != ie; ++it)
821      if ((*it)->getType() != types::TY_Nothing)
822        ++NumOutputs;
823
824    if (NumOutputs > 1) {
825      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
826      FinalOutput = 0;
827    }
828  }
829
830  for (ActionList::const_iterator it = C.getActions().begin(),
831         ie = C.getActions().end(); it != ie; ++it) {
832    Action *A = *it;
833
834    // If we are linking an image for multiple archs then the linker wants
835    // -arch_multiple and -final_output <final image name>. Unfortunately, this
836    // doesn't fit in cleanly because we have to pass this information down.
837    //
838    // FIXME: This is a hack; find a cleaner way to integrate this into the
839    // process.
840    const char *LinkingOutput = 0;
841    if (isa<LipoJobAction>(A)) {
842      if (FinalOutput)
843        LinkingOutput = FinalOutput->getValue(C.getArgs());
844      else
845        LinkingOutput = DefaultImageName.c_str();
846    }
847
848    InputInfo II;
849    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
850                       /*BoundArch*/0,
851                       /*CanAcceptPipe*/ true,
852                       /*AtTopLevel*/ true,
853                       /*LinkingOutput*/ LinkingOutput,
854                       II);
855  }
856
857  // If the user passed -Qunused-arguments or there were errors, don't warn
858  // about any unused arguments.
859  if (Diags.getNumErrors() ||
860      C.getArgs().hasArg(options::OPT_Qunused_arguments))
861    return;
862
863  // Claim -### here.
864  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
865
866  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
867       it != ie; ++it) {
868    Arg *A = *it;
869
870    // FIXME: It would be nice to be able to send the argument to the
871    // Diagnostic, so that extra values, position, and so on could be printed.
872    if (!A->isClaimed()) {
873      if (A->getOption().hasNoArgumentUnused())
874        continue;
875
876      // Suppress the warning automatically if this is just a flag, and it is an
877      // instance of an argument we already claimed.
878      const Option &Opt = A->getOption();
879      if (isa<FlagOption>(Opt)) {
880        bool DuplicateClaimed = false;
881
882        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
883               ie = C.getArgs().filtered_end(); it != ie; ++it) {
884          if ((*it)->isClaimed()) {
885            DuplicateClaimed = true;
886            break;
887          }
888        }
889
890        if (DuplicateClaimed)
891          continue;
892      }
893
894      Diag(clang::diag::warn_drv_unused_argument)
895        << A->getAsString(C.getArgs());
896    }
897  }
898}
899
900static const Tool &SelectToolForJob(Compilation &C, const ToolChain *TC,
901                                    const JobAction *JA,
902                                    const ActionList *&Inputs) {
903  const Tool *ToolForJob = 0;
904
905  // See if we should look for a compiler with an integrated assembler. We match
906  // bottom up, so what we are actually looking for is an assembler job with a
907  // compiler input.
908
909  // FIXME: This doesn't belong here, but ideally we will support static soon
910  // anyway.
911  bool HasStatic = (C.getArgs().hasArg(options::OPT_mkernel) ||
912                    C.getArgs().hasArg(options::OPT_static) ||
913                    C.getArgs().hasArg(options::OPT_fapple_kext));
914  bool IsIADefault = (TC->IsIntegratedAssemblerDefault() && !HasStatic);
915  if (C.getArgs().hasFlag(options::OPT_integrated_as,
916                         options::OPT_no_integrated_as,
917                         IsIADefault) &&
918      !C.getArgs().hasArg(options::OPT_save_temps) &&
919      isa<AssembleJobAction>(JA) &&
920      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
921    const Tool &Compiler = TC->SelectTool(C,cast<JobAction>(**Inputs->begin()));
922    if (Compiler.hasIntegratedAssembler()) {
923      Inputs = &(*Inputs)[0]->getInputs();
924      ToolForJob = &Compiler;
925    }
926  }
927
928  // Otherwise use the tool for the current job.
929  if (!ToolForJob)
930    ToolForJob = &TC->SelectTool(C, *JA);
931
932  // See if we should use an integrated preprocessor. We do so when we have
933  // exactly one input, since this is the only use case we care about
934  // (irrelevant since we don't support combine yet).
935  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
936      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
937      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
938      !C.getArgs().hasArg(options::OPT_save_temps) &&
939      ToolForJob->hasIntegratedCPP())
940    Inputs = &(*Inputs)[0]->getInputs();
941
942  return *ToolForJob;
943}
944
945void Driver::BuildJobsForAction(Compilation &C,
946                                const Action *A,
947                                const ToolChain *TC,
948                                const char *BoundArch,
949                                bool CanAcceptPipe,
950                                bool AtTopLevel,
951                                const char *LinkingOutput,
952                                InputInfo &Result) const {
953  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
954
955  bool UsePipes = C.getArgs().hasArg(options::OPT_pipe);
956  // FIXME: Pipes are forcibly disabled until we support executing them.
957  if (!CCCPrintBindings)
958    UsePipes = false;
959
960  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
961    // FIXME: It would be nice to not claim this here; maybe the old scheme of
962    // just using Args was better?
963    const Arg &Input = IA->getInputArg();
964    Input.claim();
965    if (isa<PositionalArg>(Input)) {
966      const char *Name = Input.getValue(C.getArgs());
967      Result = InputInfo(Name, A->getType(), Name);
968    } else
969      Result = InputInfo(&Input, A->getType(), "");
970    return;
971  }
972
973  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
974    const ToolChain *TC = &C.getDefaultToolChain();
975
976    std::string Arch;
977    if (BAA->getArchName())
978      TC = Host->CreateToolChain(C.getArgs(), BAA->getArchName());
979
980    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
981                       CanAcceptPipe, AtTopLevel, LinkingOutput, Result);
982    return;
983  }
984
985  const ActionList *Inputs = &A->getInputs();
986
987  const JobAction *JA = cast<JobAction>(A);
988  const Tool &T = SelectToolForJob(C, TC, JA, Inputs);
989
990  // Only use pipes when there is exactly one input.
991  bool TryToUsePipeInput = Inputs->size() == 1 && T.acceptsPipedInput();
992  InputInfoList InputInfos;
993  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
994       it != ie; ++it) {
995    InputInfo II;
996    BuildJobsForAction(C, *it, TC, BoundArch, TryToUsePipeInput,
997                       /*AtTopLevel*/false, LinkingOutput, II);
998    InputInfos.push_back(II);
999  }
1000
1001  // Determine if we should output to a pipe.
1002  bool OutputToPipe = false;
1003  if (CanAcceptPipe && T.canPipeOutput()) {
1004    // Some actions default to writing to a pipe if they are the top level phase
1005    // and there was no user override.
1006    //
1007    // FIXME: Is there a better way to handle this?
1008    if (AtTopLevel) {
1009      if (isa<PreprocessJobAction>(A) && !C.getArgs().hasArg(options::OPT_o))
1010        OutputToPipe = true;
1011    } else if (UsePipes)
1012      OutputToPipe = true;
1013  }
1014
1015  // Figure out where to put the job (pipes).
1016  Job *Dest = &C.getJobs();
1017  if (InputInfos[0].isPipe()) {
1018    assert(TryToUsePipeInput && "Unrequested pipe!");
1019    assert(InputInfos.size() == 1 && "Unexpected pipe with multiple inputs.");
1020    Dest = &InputInfos[0].getPipe();
1021  }
1022
1023  // Always use the first input as the base input.
1024  const char *BaseInput = InputInfos[0].getBaseInput();
1025
1026  // Determine the place to write output to (nothing, pipe, or filename) and
1027  // where to put the new job.
1028  if (JA->getType() == types::TY_Nothing) {
1029    Result = InputInfo(A->getType(), BaseInput);
1030  } else if (OutputToPipe) {
1031    // Append to current piped job or create a new one as appropriate.
1032    PipedJob *PJ = dyn_cast<PipedJob>(Dest);
1033    if (!PJ) {
1034      PJ = new PipedJob();
1035      // FIXME: Temporary hack so that -ccc-print-bindings work until we have
1036      // pipe support. Please remove later.
1037      if (!CCCPrintBindings)
1038        cast<JobList>(Dest)->addJob(PJ);
1039      Dest = PJ;
1040    }
1041    Result = InputInfo(PJ, A->getType(), BaseInput);
1042  } else {
1043    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, AtTopLevel),
1044                       A->getType(), BaseInput);
1045  }
1046
1047  if (CCCPrintBindings) {
1048    llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
1049                 << " - \"" << T.getName() << "\", inputs: [";
1050    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1051      llvm::errs() << InputInfos[i].getAsString();
1052      if (i + 1 != e)
1053        llvm::errs() << ", ";
1054    }
1055    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1056  } else {
1057    T.ConstructJob(C, *JA, *Dest, Result, InputInfos,
1058                   C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1059  }
1060}
1061
1062const char *Driver::GetNamedOutputPath(Compilation &C,
1063                                       const JobAction &JA,
1064                                       const char *BaseInput,
1065                                       bool AtTopLevel) const {
1066  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1067  // Output to a user requested destination?
1068  if (AtTopLevel) {
1069    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1070      return C.addResultFile(FinalOutput->getValue(C.getArgs()));
1071  }
1072
1073  // Output to a temporary file?
1074  if (!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) {
1075    std::string TmpName =
1076      GetTemporaryPath(types::getTypeTempSuffix(JA.getType()));
1077    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1078  }
1079
1080  llvm::sys::Path BasePath(BaseInput);
1081  std::string BaseName(BasePath.getLast());
1082
1083  // Determine what the derived output name should be.
1084  const char *NamedOutput;
1085  if (JA.getType() == types::TY_Image) {
1086    NamedOutput = DefaultImageName.c_str();
1087  } else {
1088    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1089    assert(Suffix && "All types used for output should have a suffix.");
1090
1091    std::string::size_type End = std::string::npos;
1092    if (!types::appendSuffixForType(JA.getType()))
1093      End = BaseName.rfind('.');
1094    std::string Suffixed(BaseName.substr(0, End));
1095    Suffixed += '.';
1096    Suffixed += Suffix;
1097    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1098  }
1099
1100  // As an annoying special case, PCH generation doesn't strip the pathname.
1101  if (JA.getType() == types::TY_PCH) {
1102    BasePath.eraseComponent();
1103    if (BasePath.isEmpty())
1104      BasePath = NamedOutput;
1105    else
1106      BasePath.appendComponent(NamedOutput);
1107    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()));
1108  } else {
1109    return C.addResultFile(NamedOutput);
1110  }
1111}
1112
1113std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1114  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1115  // attempting to use this prefix when lokup up program paths.
1116  if (!PrefixDir.empty()) {
1117    llvm::sys::Path P(PrefixDir);
1118    P.appendComponent(Name);
1119    if (P.exists())
1120      return P.str();
1121  }
1122
1123  const ToolChain::path_list &List = TC.getFilePaths();
1124  for (ToolChain::path_list::const_iterator
1125         it = List.begin(), ie = List.end(); it != ie; ++it) {
1126    llvm::sys::Path P(*it);
1127    P.appendComponent(Name);
1128    if (P.exists())
1129      return P.str();
1130  }
1131
1132  return Name;
1133}
1134
1135std::string Driver::GetProgramPath(const char *Name, const ToolChain &TC,
1136                                   bool WantFile) const {
1137  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1138  // attempting to use this prefix when lokup up program paths.
1139  if (!PrefixDir.empty()) {
1140    llvm::sys::Path P(PrefixDir);
1141    P.appendComponent(Name);
1142    if (WantFile ? P.exists() : P.canExecute())
1143      return P.str();
1144  }
1145
1146  const ToolChain::path_list &List = TC.getProgramPaths();
1147  for (ToolChain::path_list::const_iterator
1148         it = List.begin(), ie = List.end(); it != ie; ++it) {
1149    llvm::sys::Path P(*it);
1150    P.appendComponent(Name);
1151    if (WantFile ? P.exists() : P.canExecute())
1152      return P.str();
1153  }
1154
1155  // If all else failed, search the path.
1156  llvm::sys::Path P(llvm::sys::Program::FindProgramByName(Name));
1157  if (!P.empty())
1158    return P.str();
1159
1160  return Name;
1161}
1162
1163std::string Driver::GetTemporaryPath(const char *Suffix) const {
1164  // FIXME: This is lame; sys::Path should provide this function (in particular,
1165  // it should know how to find the temporary files dir).
1166  std::string Error;
1167  const char *TmpDir = ::getenv("TMPDIR");
1168  if (!TmpDir)
1169    TmpDir = ::getenv("TEMP");
1170  if (!TmpDir)
1171    TmpDir = ::getenv("TMP");
1172  if (!TmpDir)
1173    TmpDir = "/tmp";
1174  llvm::sys::Path P(TmpDir);
1175  P.appendComponent("cc");
1176  if (P.makeUnique(false, &Error)) {
1177    Diag(clang::diag::err_drv_unable_to_make_temp) << Error;
1178    return "";
1179  }
1180
1181  // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
1182  P.eraseFromDisk(false, 0);
1183
1184  P.appendSuffix(Suffix);
1185  return P.str();
1186}
1187
1188const HostInfo *Driver::GetHostInfo(const char *TripleStr) const {
1189  llvm::PrettyStackTraceString CrashInfo("Constructing host");
1190  llvm::Triple Triple(TripleStr);
1191
1192  // TCE is an osless target
1193  if (Triple.getArchName() == "tce")
1194    return createTCEHostInfo(*this, Triple);
1195
1196  switch (Triple.getOS()) {
1197  case llvm::Triple::AuroraUX:
1198    return createAuroraUXHostInfo(*this, Triple);
1199  case llvm::Triple::Darwin:
1200    return createDarwinHostInfo(*this, Triple);
1201  case llvm::Triple::DragonFly:
1202    return createDragonFlyHostInfo(*this, Triple);
1203  case llvm::Triple::OpenBSD:
1204    return createOpenBSDHostInfo(*this, Triple);
1205  case llvm::Triple::FreeBSD:
1206    return createFreeBSDHostInfo(*this, Triple);
1207  case llvm::Triple::Linux:
1208    return createLinuxHostInfo(*this, Triple);
1209  default:
1210    return createUnknownHostInfo(*this, Triple);
1211  }
1212}
1213
1214bool Driver::ShouldUseClangCompiler(const Compilation &C, const JobAction &JA,
1215                                    const llvm::Triple &Triple) const {
1216  // Check if user requested no clang, or clang doesn't understand this type (we
1217  // only handle single inputs for now).
1218  if (!CCCUseClang || JA.size() != 1 ||
1219      !types::isAcceptedByClang((*JA.begin())->getType()))
1220    return false;
1221
1222  // Otherwise make sure this is an action clang understands.
1223  if (isa<PreprocessJobAction>(JA)) {
1224    if (!CCCUseClangCPP) {
1225      Diag(clang::diag::warn_drv_not_using_clang_cpp);
1226      return false;
1227    }
1228  } else if (!isa<PrecompileJobAction>(JA) && !isa<CompileJobAction>(JA))
1229    return false;
1230
1231  // Use clang for C++?
1232  if (!CCCUseClangCXX && types::isCXX((*JA.begin())->getType())) {
1233    Diag(clang::diag::warn_drv_not_using_clang_cxx);
1234    return false;
1235  }
1236
1237  // Always use clang for precompiling, AST generation, and rewriting,
1238  // regardless of archs.
1239  if (isa<PrecompileJobAction>(JA) || JA.getType() == types::TY_AST ||
1240      JA.getType() == types::TY_RewrittenObjC)
1241    return true;
1242
1243  // Finally, don't use clang if this isn't one of the user specified archs to
1244  // build.
1245  if (!CCCClangArchs.empty() && !CCCClangArchs.count(Triple.getArch())) {
1246    Diag(clang::diag::warn_drv_not_using_clang_arch) << Triple.getArchName();
1247    return false;
1248  }
1249
1250  return true;
1251}
1252
1253/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1254/// grouped values as integers. Numbers which are not provided are set to 0.
1255///
1256/// \return True if the entire string was parsed (9.2), or all groups were
1257/// parsed (10.3.5extrastuff).
1258bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1259                               unsigned &Minor, unsigned &Micro,
1260                               bool &HadExtra) {
1261  HadExtra = false;
1262
1263  Major = Minor = Micro = 0;
1264  if (*Str == '\0')
1265    return true;
1266
1267  char *End;
1268  Major = (unsigned) strtol(Str, &End, 10);
1269  if (*Str != '\0' && *End == '\0')
1270    return true;
1271  if (*End != '.')
1272    return false;
1273
1274  Str = End+1;
1275  Minor = (unsigned) strtol(Str, &End, 10);
1276  if (*Str != '\0' && *End == '\0')
1277    return true;
1278  if (*End != '.')
1279    return false;
1280
1281  Str = End+1;
1282  Micro = (unsigned) strtol(Str, &End, 10);
1283  if (*Str != '\0' && *End == '\0')
1284    return true;
1285  if (Str == End)
1286    return false;
1287  HadExtra = true;
1288  return true;
1289}
1290