Driver.cpp revision 1ec4a86a867fc04f35d13bc9e33b04cf2171fe41 
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#include "InputInfo.h"
12#include "ToolChains.h"
13#include "clang/Basic/Version.h"
14#include "clang/Driver/Action.h"
15#include "clang/Driver/Compilation.h"
16#include "clang/Driver/DriverDiagnostic.h"
17#include "clang/Driver/Job.h"
18#include "clang/Driver/Options.h"
19#include "clang/Driver/Tool.h"
20#include "clang/Driver/ToolChain.h"
21#include "llvm/ADT/ArrayRef.h"
22#include "llvm/ADT/OwningPtr.h"
23#include "llvm/ADT/StringSet.h"
24#include "llvm/Option/Arg.h"
25#include "llvm/Option/ArgList.h"
26#include "llvm/Option/OptTable.h"
27#include "llvm/Option/Option.h"
28#include "llvm/Option/OptSpecifier.h"
29#include "llvm/Support/Debug.h"
30#include "llvm/Support/ErrorHandling.h"
31#include "llvm/Support/FileSystem.h"
32#include "llvm/Support/Path.h"
33#include "llvm/Support/PrettyStackTrace.h"
34#include "llvm/Support/Program.h"
35#include "llvm/Support/raw_ostream.h"
36#include <map>
37
38// FIXME: It would prevent us from including llvm-config.h
39// if config.h were included before system_error.h.
40#include "clang/Config/config.h"
41
42using namespace clang::driver;
43using namespace clang;
44using namespace llvm::opt;
45
46Driver::Driver(StringRef ClangExecutable,
47               StringRef DefaultTargetTriple,
48               StringRef DefaultImageName,
49               DiagnosticsEngine &Diags)
50  : Opts(createDriverOptTable()), Diags(Diags),
51    ClangExecutable(ClangExecutable), SysRoot(DEFAULT_SYSROOT),
52    UseStdLib(true), DefaultTargetTriple(DefaultTargetTriple),
53    DefaultImageName(DefaultImageName),
54    DriverTitle("clang LLVM compiler"),
55    CCPrintOptionsFilename(0), CCPrintHeadersFilename(0),
56    CCLogDiagnosticsFilename(0), CCCIsCXX(false),
57    CCCIsCPP(false),CCCEcho(false), CCCPrintBindings(false),
58    CCPrintOptions(false), CCPrintHeaders(false), CCLogDiagnostics(false),
59    CCGenDiagnostics(false), CCCGenericGCCName(""), CheckInputsExist(true),
60    CCCUsePCH(true), SuppressMissingInputWarning(false) {
61
62  Name = llvm::sys::path::stem(ClangExecutable);
63  Dir  = llvm::sys::path::parent_path(ClangExecutable);
64
65  // Compute the path to the resource directory.
66  StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
67  SmallString<128> P(Dir);
68  if (ClangResourceDir != "")
69    llvm::sys::path::append(P, ClangResourceDir);
70  else
71    llvm::sys::path::append(P, "..", "lib", "clang", CLANG_VERSION_STRING);
72  ResourceDir = P.str();
73}
74
75Driver::~Driver() {
76  delete Opts;
77
78  for (llvm::StringMap<ToolChain *>::iterator I = ToolChains.begin(),
79                                              E = ToolChains.end();
80       I != E; ++I)
81    delete I->second;
82}
83
84InputArgList *Driver::ParseArgStrings(ArrayRef<const char *> ArgList) {
85  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
86  unsigned MissingArgIndex, MissingArgCount;
87  InputArgList *Args = getOpts().ParseArgs(ArgList.begin(), ArgList.end(),
88                                           MissingArgIndex, MissingArgCount);
89
90  // Check for missing argument error.
91  if (MissingArgCount)
92    Diag(clang::diag::err_drv_missing_argument)
93      << Args->getArgString(MissingArgIndex) << MissingArgCount;
94
95  // Check for unsupported options.
96  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
97       it != ie; ++it) {
98    Arg *A = *it;
99    if (A->getOption().hasFlag(options::Unsupported)) {
100      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
101      continue;
102    }
103
104    // Warn about -mcpu= without an argument.
105    if (A->getOption().matches(options::OPT_mcpu_EQ) &&
106        A->containsValue("")) {
107      Diag(clang::diag::warn_drv_empty_joined_argument) <<
108        A->getAsString(*Args);
109    }
110  }
111
112  return Args;
113}
114
115// Determine which compilation mode we are in. We look for options which
116// affect the phase, starting with the earliest phases, and record which
117// option we used to determine the final phase.
118phases::ID Driver::getFinalPhase(const DerivedArgList &DAL, Arg **FinalPhaseArg)
119const {
120  Arg *PhaseArg = 0;
121  phases::ID FinalPhase;
122
123  // -{E,M,MM} only run the preprocessor.
124  if (CCCIsCPP ||
125      (PhaseArg = DAL.getLastArg(options::OPT_E)) ||
126      (PhaseArg = DAL.getLastArg(options::OPT_M, options::OPT_MM))) {
127    FinalPhase = phases::Preprocess;
128
129    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
130  } else if ((PhaseArg = DAL.getLastArg(options::OPT_fsyntax_only)) ||
131             (PhaseArg = DAL.getLastArg(options::OPT_module_file_info)) ||
132             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_objc)) ||
133             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_legacy_objc)) ||
134             (PhaseArg = DAL.getLastArg(options::OPT__migrate)) ||
135             (PhaseArg = DAL.getLastArg(options::OPT__analyze,
136                                        options::OPT__analyze_auto)) ||
137             (PhaseArg = DAL.getLastArg(options::OPT_emit_ast)) ||
138             (PhaseArg = DAL.getLastArg(options::OPT_S))) {
139    FinalPhase = phases::Compile;
140
141    // -c only runs up to the assembler.
142  } else if ((PhaseArg = DAL.getLastArg(options::OPT_c))) {
143    FinalPhase = phases::Assemble;
144
145    // Otherwise do everything.
146  } else
147    FinalPhase = phases::Link;
148
149  if (FinalPhaseArg)
150    *FinalPhaseArg = PhaseArg;
151
152  return FinalPhase;
153}
154
155DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
156  DerivedArgList *DAL = new DerivedArgList(Args);
157
158  bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
159  for (ArgList::const_iterator it = Args.begin(),
160         ie = Args.end(); it != ie; ++it) {
161    const Arg *A = *it;
162
163    // Unfortunately, we have to parse some forwarding options (-Xassembler,
164    // -Xlinker, -Xpreprocessor) because we either integrate their functionality
165    // (assembler and preprocessor), or bypass a previous driver ('collect2').
166
167    // Rewrite linker options, to replace --no-demangle with a custom internal
168    // option.
169    if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
170         A->getOption().matches(options::OPT_Xlinker)) &&
171        A->containsValue("--no-demangle")) {
172      // Add the rewritten no-demangle argument.
173      DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_Xlinker__no_demangle));
174
175      // Add the remaining values as Xlinker arguments.
176      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
177        if (StringRef(A->getValue(i)) != "--no-demangle")
178          DAL->AddSeparateArg(A, Opts->getOption(options::OPT_Xlinker),
179                              A->getValue(i));
180
181      continue;
182    }
183
184    // Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
185    // some build systems. We don't try to be complete here because we don't
186    // care to encourage this usage model.
187    if (A->getOption().matches(options::OPT_Wp_COMMA) &&
188        (A->getValue(0) == StringRef("-MD") ||
189         A->getValue(0) == StringRef("-MMD"))) {
190      // Rewrite to -MD/-MMD along with -MF.
191      if (A->getValue(0) == StringRef("-MD"))
192        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MD));
193      else
194        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MMD));
195      if (A->getNumValues() == 2)
196        DAL->AddSeparateArg(A, Opts->getOption(options::OPT_MF),
197                            A->getValue(1));
198      continue;
199    }
200
201    // Rewrite reserved library names.
202    if (A->getOption().matches(options::OPT_l)) {
203      StringRef Value = A->getValue();
204
205      // Rewrite unless -nostdlib is present.
206      if (!HasNostdlib && Value == "stdc++") {
207        DAL->AddFlagArg(A, Opts->getOption(
208                              options::OPT_Z_reserved_lib_stdcxx));
209        continue;
210      }
211
212      // Rewrite unconditionally.
213      if (Value == "cc_kext") {
214        DAL->AddFlagArg(A, Opts->getOption(
215                              options::OPT_Z_reserved_lib_cckext));
216        continue;
217      }
218    }
219
220    DAL->append(*it);
221  }
222
223  // Add a default value of -mlinker-version=, if one was given and the user
224  // didn't specify one.
225#if defined(HOST_LINK_VERSION)
226  if (!Args.hasArg(options::OPT_mlinker_version_EQ)) {
227    DAL->AddJoinedArg(0, Opts->getOption(options::OPT_mlinker_version_EQ),
228                      HOST_LINK_VERSION);
229    DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
230  }
231#endif
232
233  return DAL;
234}
235
236Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
237  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
238
239  // FIXME: Handle environment options which affect driver behavior, somewhere
240  // (client?). GCC_EXEC_PREFIX, LPATH, CC_PRINT_OPTIONS.
241
242  if (char *env = ::getenv("COMPILER_PATH")) {
243    StringRef CompilerPath = env;
244    while (!CompilerPath.empty()) {
245      std::pair<StringRef, StringRef> Split
246        = CompilerPath.split(llvm::sys::EnvPathSeparator);
247      PrefixDirs.push_back(Split.first);
248      CompilerPath = Split.second;
249    }
250  }
251
252  // FIXME: What are we going to do with -V and -b?
253
254  // FIXME: This stuff needs to go into the Compilation, not the driver.
255  bool CCCPrintOptions, CCCPrintActions;
256
257  InputArgList *Args = ParseArgStrings(ArgList.slice(1));
258
259  // -no-canonical-prefixes is used very early in main.
260  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
261
262  // Ignore -pipe.
263  Args->ClaimAllArgs(options::OPT_pipe);
264
265  // Extract -ccc args.
266  //
267  // FIXME: We need to figure out where this behavior should live. Most of it
268  // should be outside in the client; the parts that aren't should have proper
269  // options, either by introducing new ones or by overloading gcc ones like -V
270  // or -b.
271  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
272  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
273  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
274  CCCIsCXX = Args->hasArg(options::OPT_ccc_cxx) || CCCIsCXX;
275  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
276  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
277    CCCGenericGCCName = A->getValue();
278  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
279                            options::OPT_ccc_pch_is_pth);
280  // FIXME: DefaultTargetTriple is used by the target-prefixed calls to as/ld
281  // and getToolChain is const.
282  if (const Arg *A = Args->getLastArg(options::OPT_target))
283    DefaultTargetTriple = A->getValue();
284  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
285    Dir = InstalledDir = A->getValue();
286  for (arg_iterator it = Args->filtered_begin(options::OPT_B),
287         ie = Args->filtered_end(); it != ie; ++it) {
288    const Arg *A = *it;
289    A->claim();
290    PrefixDirs.push_back(A->getValue(0));
291  }
292  if (const Arg *A = Args->getLastArg(options::OPT__sysroot_EQ))
293    SysRoot = A->getValue();
294  if (const Arg *A = Args->getLastArg(options::OPT__dyld_prefix_EQ))
295    DyldPrefix = A->getValue();
296  if (Args->hasArg(options::OPT_nostdlib))
297    UseStdLib = false;
298
299  if (const Arg *A = Args->getLastArg(options::OPT_resource_dir))
300    ResourceDir = A->getValue();
301
302  // Perform the default argument translations.
303  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
304
305  // Owned by the host.
306  const ToolChain &TC = getToolChain(*Args);
307
308  // The compilation takes ownership of Args.
309  Compilation *C = new Compilation(*this, TC, Args, TranslatedArgs);
310
311  // FIXME: This behavior shouldn't be here.
312  if (CCCPrintOptions) {
313    PrintOptions(C->getInputArgs());
314    return C;
315  }
316
317  if (!HandleImmediateArgs(*C))
318    return C;
319
320  // Construct the list of inputs.
321  InputList Inputs;
322  BuildInputs(C->getDefaultToolChain(), C->getArgs(), Inputs);
323
324  // Construct the list of abstract actions to perform for this compilation. On
325  // Darwin target OSes this uses the driver-driver and universal actions.
326  if (TC.getTriple().isOSDarwin())
327    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
328                          Inputs, C->getActions());
329  else
330    BuildActions(C->getDefaultToolChain(), C->getArgs(), Inputs,
331                 C->getActions());
332
333  if (CCCPrintActions) {
334    PrintActions(*C);
335    return C;
336  }
337
338  BuildJobs(*C);
339
340  return C;
341}
342
343// When clang crashes, produce diagnostic information including the fully
344// preprocessed source file(s).  Request that the developer attach the
345// diagnostic information to a bug report.
346void Driver::generateCompilationDiagnostics(Compilation &C,
347                                            const Command *FailingCommand) {
348  if (C.getArgs().hasArg(options::OPT_fno_crash_diagnostics))
349    return;
350
351  // Don't try to generate diagnostics for link or dsymutil jobs.
352  if (FailingCommand && (FailingCommand->getCreator().isLinkJob() ||
353                         FailingCommand->getCreator().isDsymutilJob()))
354    return;
355
356  // Print the version of the compiler.
357  PrintVersion(C, llvm::errs());
358
359  Diag(clang::diag::note_drv_command_failed_diag_msg)
360    << "PLEASE submit a bug report to " BUG_REPORT_URL " and include the "
361    "crash backtrace, preprocessed source, and associated run script.";
362
363  // Suppress driver output and emit preprocessor output to temp file.
364  CCCIsCPP = true;
365  CCGenDiagnostics = true;
366  C.getArgs().AddFlagArg(0, Opts->getOption(options::OPT_frewrite_includes));
367
368  // Save the original job command(s).
369  std::string Cmd;
370  llvm::raw_string_ostream OS(Cmd);
371  if (FailingCommand)
372    C.PrintDiagnosticJob(OS, *FailingCommand);
373  else
374    // Crash triggered by FORCE_CLANG_DIAGNOSTICS_CRASH, which doesn't have an
375    // associated FailingCommand, so just pass all jobs.
376    C.PrintDiagnosticJob(OS, C.getJobs());
377  OS.flush();
378
379  // Keep track of whether we produce any errors while trying to produce
380  // preprocessed sources.
381  DiagnosticErrorTrap Trap(Diags);
382
383  // Suppress tool output.
384  C.initCompilationForDiagnostics();
385
386  // Construct the list of inputs.
387  InputList Inputs;
388  BuildInputs(C.getDefaultToolChain(), C.getArgs(), Inputs);
389
390  for (InputList::iterator it = Inputs.begin(), ie = Inputs.end(); it != ie;) {
391    bool IgnoreInput = false;
392
393    // Ignore input from stdin or any inputs that cannot be preprocessed.
394    if (!strcmp(it->second->getValue(), "-")) {
395      Diag(clang::diag::note_drv_command_failed_diag_msg)
396        << "Error generating preprocessed source(s) - ignoring input from stdin"
397        ".";
398      IgnoreInput = true;
399    } else if (types::getPreprocessedType(it->first) == types::TY_INVALID) {
400      IgnoreInput = true;
401    }
402
403    if (IgnoreInput) {
404      it = Inputs.erase(it);
405      ie = Inputs.end();
406    } else {
407      ++it;
408    }
409  }
410
411  if (Inputs.empty()) {
412    Diag(clang::diag::note_drv_command_failed_diag_msg)
413      << "Error generating preprocessed source(s) - no preprocessable inputs.";
414    return;
415  }
416
417  // Don't attempt to generate preprocessed files if multiple -arch options are
418  // used, unless they're all duplicates.
419  llvm::StringSet<> ArchNames;
420  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
421       it != ie; ++it) {
422    Arg *A = *it;
423    if (A->getOption().matches(options::OPT_arch)) {
424      StringRef ArchName = A->getValue();
425      ArchNames.insert(ArchName);
426    }
427  }
428  if (ArchNames.size() > 1) {
429    Diag(clang::diag::note_drv_command_failed_diag_msg)
430      << "Error generating preprocessed source(s) - cannot generate "
431      "preprocessed source with multiple -arch options.";
432    return;
433  }
434
435  // Construct the list of abstract actions to perform for this compilation. On
436  // Darwin OSes this uses the driver-driver and builds universal actions.
437  const ToolChain &TC = C.getDefaultToolChain();
438  if (TC.getTriple().isOSDarwin())
439    BuildUniversalActions(TC, C.getArgs(), Inputs, C.getActions());
440  else
441    BuildActions(TC, C.getArgs(), Inputs, C.getActions());
442
443  BuildJobs(C);
444
445  // If there were errors building the compilation, quit now.
446  if (Trap.hasErrorOccurred()) {
447    Diag(clang::diag::note_drv_command_failed_diag_msg)
448      << "Error generating preprocessed source(s).";
449    return;
450  }
451
452  // Generate preprocessed output.
453  SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
454  C.ExecuteJob(C.getJobs(), FailingCommands);
455
456  // If the command succeeded, we are done.
457  if (FailingCommands.empty()) {
458    Diag(clang::diag::note_drv_command_failed_diag_msg)
459      << "\n********************\n\n"
460      "PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:\n"
461      "Preprocessed source(s) and associated run script(s) are located at:";
462    ArgStringList Files = C.getTempFiles();
463    for (ArgStringList::const_iterator it = Files.begin(), ie = Files.end();
464         it != ie; ++it) {
465      Diag(clang::diag::note_drv_command_failed_diag_msg) << *it;
466
467      std::string Err;
468      std::string Script = StringRef(*it).rsplit('.').first;
469      Script += ".sh";
470      llvm::raw_fd_ostream ScriptOS(Script.c_str(), Err,
471                                    llvm::raw_fd_ostream::F_Excl |
472                                    llvm::raw_fd_ostream::F_Binary);
473      if (!Err.empty()) {
474        Diag(clang::diag::note_drv_command_failed_diag_msg)
475          << "Error generating run script: " + Script + " " + Err;
476      } else {
477        // Append the new filename with correct preprocessed suffix.
478        size_t I, E;
479        I = Cmd.find("-main-file-name ");
480        assert (I != std::string::npos && "Expected to find -main-file-name");
481        I += 16;
482        E = Cmd.find(" ", I);
483        assert (E != std::string::npos && "-main-file-name missing argument?");
484        StringRef OldFilename = StringRef(Cmd).slice(I, E);
485        StringRef NewFilename = llvm::sys::path::filename(*it);
486        I = StringRef(Cmd).rfind(OldFilename);
487        E = I + OldFilename.size();
488        I = Cmd.rfind(" ", I) + 1;
489        Cmd.replace(I, E - I, NewFilename.data(), NewFilename.size());
490        ScriptOS << Cmd;
491        Diag(clang::diag::note_drv_command_failed_diag_msg) << Script;
492      }
493    }
494    Diag(clang::diag::note_drv_command_failed_diag_msg)
495      << "\n\n********************";
496  } else {
497    // Failure, remove preprocessed files.
498    if (!C.getArgs().hasArg(options::OPT_save_temps))
499      C.CleanupFileList(C.getTempFiles(), true);
500
501    Diag(clang::diag::note_drv_command_failed_diag_msg)
502      << "Error generating preprocessed source(s).";
503  }
504}
505
506int Driver::ExecuteCompilation(const Compilation &C,
507    SmallVectorImpl< std::pair<int, const Command *> > &FailingCommands) const {
508  // Just print if -### was present.
509  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
510    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
511    return 0;
512  }
513
514  // If there were errors building the compilation, quit now.
515  if (Diags.hasErrorOccurred())
516    return 1;
517
518  C.ExecuteJob(C.getJobs(), FailingCommands);
519
520  // Remove temp files.
521  C.CleanupFileList(C.getTempFiles());
522
523  // If the command succeeded, we are done.
524  if (FailingCommands.empty())
525    return 0;
526
527  // Otherwise, remove result files and print extra information about abnormal
528  // failures.
529  for (SmallVectorImpl< std::pair<int, const Command *> >::iterator it =
530         FailingCommands.begin(), ie = FailingCommands.end(); it != ie; ++it) {
531    int Res = it->first;
532    const Command *FailingCommand = it->second;
533
534    // Remove result files if we're not saving temps.
535    if (!C.getArgs().hasArg(options::OPT_save_temps)) {
536      const JobAction *JA = cast<JobAction>(&FailingCommand->getSource());
537      C.CleanupFileMap(C.getResultFiles(), JA, true);
538
539      // Failure result files are valid unless we crashed.
540      if (Res < 0)
541        C.CleanupFileMap(C.getFailureResultFiles(), JA, true);
542    }
543
544    // Print extra information about abnormal failures, if possible.
545    //
546    // This is ad-hoc, but we don't want to be excessively noisy. If the result
547    // status was 1, assume the command failed normally. In particular, if it
548    // was the compiler then assume it gave a reasonable error code. Failures
549    // in other tools are less common, and they generally have worse
550    // diagnostics, so always print the diagnostic there.
551    const Tool &FailingTool = FailingCommand->getCreator();
552
553    if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
554      // FIXME: See FIXME above regarding result code interpretation.
555      if (Res < 0)
556        Diag(clang::diag::err_drv_command_signalled)
557          << FailingTool.getShortName();
558      else
559        Diag(clang::diag::err_drv_command_failed)
560          << FailingTool.getShortName() << Res;
561    }
562  }
563  return 0;
564}
565
566void Driver::PrintOptions(const ArgList &Args) const {
567  unsigned i = 0;
568  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
569       it != ie; ++it, ++i) {
570    Arg *A = *it;
571    llvm::errs() << "Option " << i << " - "
572                 << "Name: \"" << A->getOption().getPrefixedName() << "\", "
573                 << "Values: {";
574    for (unsigned j = 0; j < A->getNumValues(); ++j) {
575      if (j)
576        llvm::errs() << ", ";
577      llvm::errs() << '"' << A->getValue(j) << '"';
578    }
579    llvm::errs() << "}\n";
580  }
581}
582
583void Driver::PrintHelp(bool ShowHidden) const {
584  getOpts().PrintHelp(
585      llvm::outs(), Name.c_str(), DriverTitle.c_str(), /*Include*/ 0,
586      /*Exclude*/ options::NoDriverOption | (ShowHidden ? 0 : HelpHidden));
587}
588
589void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
590  // FIXME: The following handlers should use a callback mechanism, we don't
591  // know what the client would like to do.
592  OS << getClangFullVersion() << '\n';
593  const ToolChain &TC = C.getDefaultToolChain();
594  OS << "Target: " << TC.getTripleString() << '\n';
595
596  // Print the threading model.
597  //
598  // FIXME: Implement correctly.
599  OS << "Thread model: " << "posix" << '\n';
600}
601
602/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
603/// option.
604static void PrintDiagnosticCategories(raw_ostream &OS) {
605  // Skip the empty category.
606  for (unsigned i = 1, max = DiagnosticIDs::getNumberOfCategories();
607       i != max; ++i)
608    OS << i << ',' << DiagnosticIDs::getCategoryNameFromID(i) << '\n';
609}
610
611bool Driver::HandleImmediateArgs(const Compilation &C) {
612  // The order these options are handled in gcc is all over the place, but we
613  // don't expect inconsistencies w.r.t. that to matter in practice.
614
615  if (C.getArgs().hasArg(options::OPT_dumpmachine)) {
616    llvm::outs() << C.getDefaultToolChain().getTripleString() << '\n';
617    return false;
618  }
619
620  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
621    // Since -dumpversion is only implemented for pedantic GCC compatibility, we
622    // return an answer which matches our definition of __VERSION__.
623    //
624    // If we want to return a more correct answer some day, then we should
625    // introduce a non-pedantically GCC compatible mode to Clang in which we
626    // provide sensible definitions for -dumpversion, __VERSION__, etc.
627    llvm::outs() << "4.2.1\n";
628    return false;
629  }
630
631  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
632    PrintDiagnosticCategories(llvm::outs());
633    return false;
634  }
635
636  if (C.getArgs().hasArg(options::OPT_help) ||
637      C.getArgs().hasArg(options::OPT__help_hidden)) {
638    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
639    return false;
640  }
641
642  if (C.getArgs().hasArg(options::OPT__version)) {
643    // Follow gcc behavior and use stdout for --version and stderr for -v.
644    PrintVersion(C, llvm::outs());
645    return false;
646  }
647
648  if (C.getArgs().hasArg(options::OPT_v) ||
649      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
650    PrintVersion(C, llvm::errs());
651    SuppressMissingInputWarning = true;
652  }
653
654  const ToolChain &TC = C.getDefaultToolChain();
655  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
656    llvm::outs() << "programs: =";
657    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
658           ie = TC.getProgramPaths().end(); it != ie; ++it) {
659      if (it != TC.getProgramPaths().begin())
660        llvm::outs() << ':';
661      llvm::outs() << *it;
662    }
663    llvm::outs() << "\n";
664    llvm::outs() << "libraries: =" << ResourceDir;
665
666    StringRef sysroot = C.getSysRoot();
667
668    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
669           ie = TC.getFilePaths().end(); it != ie; ++it) {
670      llvm::outs() << ':';
671      const char *path = it->c_str();
672      if (path[0] == '=')
673        llvm::outs() << sysroot << path + 1;
674      else
675        llvm::outs() << path;
676    }
677    llvm::outs() << "\n";
678    return false;
679  }
680
681  // FIXME: The following handlers should use a callback mechanism, we don't
682  // know what the client would like to do.
683  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
684    llvm::outs() << GetFilePath(A->getValue(), TC) << "\n";
685    return false;
686  }
687
688  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
689    llvm::outs() << GetProgramPath(A->getValue(), TC) << "\n";
690    return false;
691  }
692
693  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
694    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
695    return false;
696  }
697
698  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
699    // FIXME: We need tool chain support for this.
700    llvm::outs() << ".;\n";
701
702    switch (C.getDefaultToolChain().getTriple().getArch()) {
703    default:
704      break;
705
706    case llvm::Triple::x86_64:
707      llvm::outs() << "x86_64;@m64" << "\n";
708      break;
709
710    case llvm::Triple::ppc64:
711      llvm::outs() << "ppc64;@m64" << "\n";
712      break;
713    }
714    return false;
715  }
716
717  // FIXME: What is the difference between print-multi-directory and
718  // print-multi-os-directory?
719  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
720      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
721    switch (C.getDefaultToolChain().getTriple().getArch()) {
722    default:
723    case llvm::Triple::x86:
724    case llvm::Triple::ppc:
725      llvm::outs() << "." << "\n";
726      break;
727
728    case llvm::Triple::x86_64:
729      llvm::outs() << "x86_64" << "\n";
730      break;
731
732    case llvm::Triple::ppc64:
733      llvm::outs() << "ppc64" << "\n";
734      break;
735    }
736    return false;
737  }
738
739  return true;
740}
741
742static unsigned PrintActions1(const Compilation &C, Action *A,
743                              std::map<Action*, unsigned> &Ids) {
744  if (Ids.count(A))
745    return Ids[A];
746
747  std::string str;
748  llvm::raw_string_ostream os(str);
749
750  os << Action::getClassName(A->getKind()) << ", ";
751  if (InputAction *IA = dyn_cast<InputAction>(A)) {
752    os << "\"" << IA->getInputArg().getValue() << "\"";
753  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
754    os << '"' << BIA->getArchName() << '"'
755       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
756  } else {
757    os << "{";
758    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
759      os << PrintActions1(C, *it, Ids);
760      ++it;
761      if (it != ie)
762        os << ", ";
763    }
764    os << "}";
765  }
766
767  unsigned Id = Ids.size();
768  Ids[A] = Id;
769  llvm::errs() << Id << ": " << os.str() << ", "
770               << types::getTypeName(A->getType()) << "\n";
771
772  return Id;
773}
774
775void Driver::PrintActions(const Compilation &C) const {
776  std::map<Action*, unsigned> Ids;
777  for (ActionList::const_iterator it = C.getActions().begin(),
778         ie = C.getActions().end(); it != ie; ++it)
779    PrintActions1(C, *it, Ids);
780}
781
782/// \brief Check whether the given input tree contains any compilation or
783/// assembly actions.
784static bool ContainsCompileOrAssembleAction(const Action *A) {
785  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
786    return true;
787
788  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
789    if (ContainsCompileOrAssembleAction(*it))
790      return true;
791
792  return false;
793}
794
795void Driver::BuildUniversalActions(const ToolChain &TC,
796                                   const DerivedArgList &Args,
797                                   const InputList &BAInputs,
798                                   ActionList &Actions) const {
799  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
800  // Collect the list of architectures. Duplicates are allowed, but should only
801  // be handled once (in the order seen).
802  llvm::StringSet<> ArchNames;
803  SmallVector<const char *, 4> Archs;
804  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
805       it != ie; ++it) {
806    Arg *A = *it;
807
808    if (A->getOption().matches(options::OPT_arch)) {
809      // Validate the option here; we don't save the type here because its
810      // particular spelling may participate in other driver choices.
811      llvm::Triple::ArchType Arch =
812        tools::darwin::getArchTypeForDarwinArchName(A->getValue());
813      if (Arch == llvm::Triple::UnknownArch) {
814        Diag(clang::diag::err_drv_invalid_arch_name)
815          << A->getAsString(Args);
816        continue;
817      }
818
819      A->claim();
820      if (ArchNames.insert(A->getValue()))
821        Archs.push_back(A->getValue());
822    }
823  }
824
825  // When there is no explicit arch for this platform, make sure we still bind
826  // the architecture (to the default) so that -Xarch_ is handled correctly.
827  if (!Archs.size())
828    Archs.push_back(Args.MakeArgString(TC.getDefaultUniversalArchName()));
829
830  ActionList SingleActions;
831  BuildActions(TC, Args, BAInputs, SingleActions);
832
833  // Add in arch bindings for every top level action, as well as lipo and
834  // dsymutil steps if needed.
835  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
836    Action *Act = SingleActions[i];
837
838    // Make sure we can lipo this kind of output. If not (and it is an actual
839    // output) then we disallow, since we can't create an output file with the
840    // right name without overwriting it. We could remove this oddity by just
841    // changing the output names to include the arch, which would also fix
842    // -save-temps. Compatibility wins for now.
843
844    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
845      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
846        << types::getTypeName(Act->getType());
847
848    ActionList Inputs;
849    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
850      Inputs.push_back(new BindArchAction(Act, Archs[i]));
851      if (i != 0)
852        Inputs.back()->setOwnsInputs(false);
853    }
854
855    // Lipo if necessary, we do it this way because we need to set the arch flag
856    // so that -Xarch_ gets overwritten.
857    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
858      Actions.append(Inputs.begin(), Inputs.end());
859    else
860      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
861
862    // Handle debug info queries.
863    Arg *A = Args.getLastArg(options::OPT_g_Group);
864    if (A && !A->getOption().matches(options::OPT_g0) &&
865        !A->getOption().matches(options::OPT_gstabs) &&
866        ContainsCompileOrAssembleAction(Actions.back())) {
867
868      // Add a 'dsymutil' step if necessary, when debug info is enabled and we
869      // have a compile input. We need to run 'dsymutil' ourselves in such cases
870      // because the debug info will refer to a temporary object file which
871      // will be removed at the end of the compilation process.
872      if (Act->getType() == types::TY_Image) {
873        ActionList Inputs;
874        Inputs.push_back(Actions.back());
875        Actions.pop_back();
876        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
877      }
878
879      // Verify the output (debug information only) if we passed '-verify'.
880      if (Args.hasArg(options::OPT_verify)) {
881        ActionList VerifyInputs;
882        VerifyInputs.push_back(Actions.back());
883        Actions.pop_back();
884        Actions.push_back(new VerifyJobAction(VerifyInputs,
885                                              types::TY_Nothing));
886      }
887    }
888  }
889}
890
891// Construct a the list of inputs and their types.
892void Driver::BuildInputs(const ToolChain &TC, const DerivedArgList &Args,
893                         InputList &Inputs) const {
894  // Track the current user specified (-x) input. We also explicitly track the
895  // argument used to set the type; we only want to claim the type when we
896  // actually use it, so we warn about unused -x arguments.
897  types::ID InputType = types::TY_Nothing;
898  Arg *InputTypeArg = 0;
899
900  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
901       it != ie; ++it) {
902    Arg *A = *it;
903
904    if (A->getOption().getKind() == Option::InputClass) {
905      const char *Value = A->getValue();
906      types::ID Ty = types::TY_INVALID;
907
908      // Infer the input type if necessary.
909      if (InputType == types::TY_Nothing) {
910        // If there was an explicit arg for this, claim it.
911        if (InputTypeArg)
912          InputTypeArg->claim();
913
914        // stdin must be handled specially.
915        if (memcmp(Value, "-", 2) == 0) {
916          // If running with -E, treat as a C input (this changes the builtin
917          // macros, for example). This may be overridden by -ObjC below.
918          //
919          // Otherwise emit an error but still use a valid type to avoid
920          // spurious errors (e.g., no inputs).
921          if (!Args.hasArgNoClaim(options::OPT_E) && !CCCIsCPP)
922            Diag(clang::diag::err_drv_unknown_stdin_type);
923          Ty = types::TY_C;
924        } else {
925          // Otherwise lookup by extension.
926          // Fallback is C if invoked as C preprocessor or Object otherwise.
927          // We use a host hook here because Darwin at least has its own
928          // idea of what .s is.
929          if (const char *Ext = strrchr(Value, '.'))
930            Ty = TC.LookupTypeForExtension(Ext + 1);
931
932          if (Ty == types::TY_INVALID) {
933            if (CCCIsCPP)
934              Ty = types::TY_C;
935            else
936              Ty = types::TY_Object;
937          }
938
939          // If the driver is invoked as C++ compiler (like clang++ or c++) it
940          // should autodetect some input files as C++ for g++ compatibility.
941          if (CCCIsCXX) {
942            types::ID OldTy = Ty;
943            Ty = types::lookupCXXTypeForCType(Ty);
944
945            if (Ty != OldTy)
946              Diag(clang::diag::warn_drv_treating_input_as_cxx)
947                << getTypeName(OldTy) << getTypeName(Ty);
948          }
949        }
950
951        // -ObjC and -ObjC++ override the default language, but only for "source
952        // files". We just treat everything that isn't a linker input as a
953        // source file.
954        //
955        // FIXME: Clean this up if we move the phase sequence into the type.
956        if (Ty != types::TY_Object) {
957          if (Args.hasArg(options::OPT_ObjC))
958            Ty = types::TY_ObjC;
959          else if (Args.hasArg(options::OPT_ObjCXX))
960            Ty = types::TY_ObjCXX;
961        }
962      } else {
963        assert(InputTypeArg && "InputType set w/o InputTypeArg");
964        InputTypeArg->claim();
965        Ty = InputType;
966      }
967
968      // Check that the file exists, if enabled.
969      if (CheckInputsExist && memcmp(Value, "-", 2) != 0) {
970        SmallString<64> Path(Value);
971        if (Arg *WorkDir = Args.getLastArg(options::OPT_working_directory)) {
972          if (!llvm::sys::path::is_absolute(Path.str())) {
973            SmallString<64> Directory(WorkDir->getValue());
974            llvm::sys::path::append(Directory, Value);
975            Path.assign(Directory);
976          }
977        }
978
979        if (!llvm::sys::fs::exists(Twine(Path)))
980          Diag(clang::diag::err_drv_no_such_file) << Path.str();
981        else
982          Inputs.push_back(std::make_pair(Ty, A));
983      } else
984        Inputs.push_back(std::make_pair(Ty, A));
985
986    } else if (A->getOption().hasFlag(options::LinkerInput)) {
987      // Just treat as object type, we could make a special type for this if
988      // necessary.
989      Inputs.push_back(std::make_pair(types::TY_Object, A));
990
991    } else if (A->getOption().matches(options::OPT_x)) {
992      InputTypeArg = A;
993      InputType = types::lookupTypeForTypeSpecifier(A->getValue());
994      A->claim();
995
996      // Follow gcc behavior and treat as linker input for invalid -x
997      // options. Its not clear why we shouldn't just revert to unknown; but
998      // this isn't very important, we might as well be bug compatible.
999      if (!InputType) {
1000        Diag(clang::diag::err_drv_unknown_language) << A->getValue();
1001        InputType = types::TY_Object;
1002      }
1003    }
1004  }
1005  if (CCCIsCPP && Inputs.empty()) {
1006    // If called as standalone preprocessor, stdin is processed
1007    // if no other input is present.
1008    unsigned Index = Args.getBaseArgs().MakeIndex("-");
1009    Arg *A = Opts->ParseOneArg(Args, Index);
1010    A->claim();
1011    Inputs.push_back(std::make_pair(types::TY_C, A));
1012  }
1013}
1014
1015void Driver::BuildActions(const ToolChain &TC, const DerivedArgList &Args,
1016                          const InputList &Inputs, ActionList &Actions) const {
1017  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
1018
1019  if (!SuppressMissingInputWarning && Inputs.empty()) {
1020    Diag(clang::diag::err_drv_no_input_files);
1021    return;
1022  }
1023
1024  Arg *FinalPhaseArg;
1025  phases::ID FinalPhase = getFinalPhase(Args, &FinalPhaseArg);
1026
1027  // Reject -Z* at the top level, these options should never have been exposed
1028  // by gcc.
1029  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
1030    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
1031
1032  // Construct the actions to perform.
1033  ActionList LinkerInputs;
1034  ActionList SplitInputs;
1035  llvm::SmallVector<phases::ID, phases::MaxNumberOfPhases> PL;
1036  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1037    types::ID InputType = Inputs[i].first;
1038    const Arg *InputArg = Inputs[i].second;
1039
1040    PL.clear();
1041    types::getCompilationPhases(InputType, PL);
1042
1043    // If the first step comes after the final phase we are doing as part of
1044    // this compilation, warn the user about it.
1045    phases::ID InitialPhase = PL[0];
1046    if (InitialPhase > FinalPhase) {
1047      // Claim here to avoid the more general unused warning.
1048      InputArg->claim();
1049
1050      // Suppress all unused style warnings with -Qunused-arguments
1051      if (Args.hasArg(options::OPT_Qunused_arguments))
1052        continue;
1053
1054      // Special case when final phase determined by binary name, rather than
1055      // by a command-line argument with a corresponding Arg.
1056      if (CCCIsCPP)
1057        Diag(clang::diag::warn_drv_input_file_unused_by_cpp)
1058          << InputArg->getAsString(Args)
1059          << getPhaseName(InitialPhase);
1060      // Special case '-E' warning on a previously preprocessed file to make
1061      // more sense.
1062      else if (InitialPhase == phases::Compile &&
1063               FinalPhase == phases::Preprocess &&
1064               getPreprocessedType(InputType) == types::TY_INVALID)
1065        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
1066          << InputArg->getAsString(Args)
1067          << !!FinalPhaseArg
1068          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1069      else
1070        Diag(clang::diag::warn_drv_input_file_unused)
1071          << InputArg->getAsString(Args)
1072          << getPhaseName(InitialPhase)
1073          << !!FinalPhaseArg
1074          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1075      continue;
1076    }
1077
1078    // Build the pipeline for this file.
1079    OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
1080    for (SmallVectorImpl<phases::ID>::iterator
1081           i = PL.begin(), e = PL.end(); i != e; ++i) {
1082      phases::ID Phase = *i;
1083
1084      // We are done if this step is past what the user requested.
1085      if (Phase > FinalPhase)
1086        break;
1087
1088      // Queue linker inputs.
1089      if (Phase == phases::Link) {
1090        assert((i + 1) == e && "linking must be final compilation step.");
1091        LinkerInputs.push_back(Current.take());
1092        break;
1093      }
1094
1095      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
1096      // encode this in the steps because the intermediate type depends on
1097      // arguments. Just special case here.
1098      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
1099        continue;
1100
1101      // Otherwise construct the appropriate action.
1102      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
1103      if (Current->getType() == types::TY_Nothing)
1104        break;
1105    }
1106
1107    // If we ended with something, add to the output list.
1108    if (Current)
1109      Actions.push_back(Current.take());
1110  }
1111
1112  // Add a link action if necessary.
1113  if (!LinkerInputs.empty())
1114    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
1115
1116  // If we are linking, claim any options which are obviously only used for
1117  // compilation.
1118  if (FinalPhase == phases::Link && PL.size() == 1)
1119    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
1120}
1121
1122Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
1123                                     Action *Input) const {
1124  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
1125  // Build the appropriate action.
1126  switch (Phase) {
1127  case phases::Link: llvm_unreachable("link action invalid here.");
1128  case phases::Preprocess: {
1129    types::ID OutputTy;
1130    // -{M, MM} alter the output type.
1131    if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
1132      OutputTy = types::TY_Dependencies;
1133    } else {
1134      OutputTy = Input->getType();
1135      if (!Args.hasFlag(options::OPT_frewrite_includes,
1136                        options::OPT_fno_rewrite_includes, false))
1137        OutputTy = types::getPreprocessedType(OutputTy);
1138      assert(OutputTy != types::TY_INVALID &&
1139             "Cannot preprocess this input type!");
1140    }
1141    return new PreprocessJobAction(Input, OutputTy);
1142  }
1143  case phases::Precompile: {
1144    types::ID OutputTy = types::TY_PCH;
1145    if (Args.hasArg(options::OPT_fsyntax_only)) {
1146      // Syntax checks should not emit a PCH file
1147      OutputTy = types::TY_Nothing;
1148    }
1149    return new PrecompileJobAction(Input, OutputTy);
1150  }
1151  case phases::Compile: {
1152    if (Args.hasArg(options::OPT_fsyntax_only)) {
1153      return new CompileJobAction(Input, types::TY_Nothing);
1154    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
1155      return new CompileJobAction(Input, types::TY_RewrittenObjC);
1156    } else if (Args.hasArg(options::OPT_rewrite_legacy_objc)) {
1157      return new CompileJobAction(Input, types::TY_RewrittenLegacyObjC);
1158    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
1159      return new AnalyzeJobAction(Input, types::TY_Plist);
1160    } else if (Args.hasArg(options::OPT__migrate)) {
1161      return new MigrateJobAction(Input, types::TY_Remap);
1162    } else if (Args.hasArg(options::OPT_emit_ast)) {
1163      return new CompileJobAction(Input, types::TY_AST);
1164    } else if (Args.hasArg(options::OPT_module_file_info)) {
1165      return new CompileJobAction(Input, types::TY_ModuleFile);
1166    } else if (IsUsingLTO(Args)) {
1167      types::ID Output =
1168        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
1169      return new CompileJobAction(Input, Output);
1170    } else {
1171      return new CompileJobAction(Input, types::TY_PP_Asm);
1172    }
1173  }
1174  case phases::Assemble:
1175    return new AssembleJobAction(Input, types::TY_Object);
1176  }
1177
1178  llvm_unreachable("invalid phase in ConstructPhaseAction");
1179}
1180
1181bool Driver::IsUsingLTO(const ArgList &Args) const {
1182  // Check for -emit-llvm or -flto.
1183  if (Args.hasArg(options::OPT_emit_llvm) ||
1184      Args.hasFlag(options::OPT_flto, options::OPT_fno_lto, false))
1185    return true;
1186
1187  // Check for -O4.
1188  if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
1189      return A->getOption().matches(options::OPT_O4);
1190
1191  return false;
1192}
1193
1194void Driver::BuildJobs(Compilation &C) const {
1195  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1196
1197  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
1198
1199  // It is an error to provide a -o option if we are making multiple output
1200  // files.
1201  if (FinalOutput) {
1202    unsigned NumOutputs = 0;
1203    for (ActionList::const_iterator it = C.getActions().begin(),
1204           ie = C.getActions().end(); it != ie; ++it)
1205      if ((*it)->getType() != types::TY_Nothing)
1206        ++NumOutputs;
1207
1208    if (NumOutputs > 1) {
1209      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
1210      FinalOutput = 0;
1211    }
1212  }
1213
1214  // Collect the list of architectures.
1215  llvm::StringSet<> ArchNames;
1216  if (C.getDefaultToolChain().getTriple().isOSDarwin()) {
1217    for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1218         it != ie; ++it) {
1219      Arg *A = *it;
1220      if (A->getOption().matches(options::OPT_arch))
1221        ArchNames.insert(A->getValue());
1222    }
1223  }
1224
1225  for (ActionList::const_iterator it = C.getActions().begin(),
1226         ie = C.getActions().end(); it != ie; ++it) {
1227    Action *A = *it;
1228
1229    // If we are linking an image for multiple archs then the linker wants
1230    // -arch_multiple and -final_output <final image name>. Unfortunately, this
1231    // doesn't fit in cleanly because we have to pass this information down.
1232    //
1233    // FIXME: This is a hack; find a cleaner way to integrate this into the
1234    // process.
1235    const char *LinkingOutput = 0;
1236    if (isa<LipoJobAction>(A)) {
1237      if (FinalOutput)
1238        LinkingOutput = FinalOutput->getValue();
1239      else
1240        LinkingOutput = DefaultImageName.c_str();
1241    }
1242
1243    InputInfo II;
1244    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
1245                       /*BoundArch*/0,
1246                       /*AtTopLevel*/ true,
1247                       /*MultipleArchs*/ ArchNames.size() > 1,
1248                       /*LinkingOutput*/ LinkingOutput,
1249                       II);
1250  }
1251
1252  // If the user passed -Qunused-arguments or there were errors, don't warn
1253  // about any unused arguments.
1254  if (Diags.hasErrorOccurred() ||
1255      C.getArgs().hasArg(options::OPT_Qunused_arguments))
1256    return;
1257
1258  // Claim -### here.
1259  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
1260
1261  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1262       it != ie; ++it) {
1263    Arg *A = *it;
1264
1265    // FIXME: It would be nice to be able to send the argument to the
1266    // DiagnosticsEngine, so that extra values, position, and so on could be
1267    // printed.
1268    if (!A->isClaimed()) {
1269      if (A->getOption().hasFlag(options::NoArgumentUnused))
1270        continue;
1271
1272      // Suppress the warning automatically if this is just a flag, and it is an
1273      // instance of an argument we already claimed.
1274      const Option &Opt = A->getOption();
1275      if (Opt.getKind() == Option::FlagClass) {
1276        bool DuplicateClaimed = false;
1277
1278        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
1279               ie = C.getArgs().filtered_end(); it != ie; ++it) {
1280          if ((*it)->isClaimed()) {
1281            DuplicateClaimed = true;
1282            break;
1283          }
1284        }
1285
1286        if (DuplicateClaimed)
1287          continue;
1288      }
1289
1290      Diag(clang::diag::warn_drv_unused_argument)
1291        << A->getAsString(C.getArgs());
1292    }
1293  }
1294}
1295
1296static const Tool *SelectToolForJob(Compilation &C, const ToolChain *TC,
1297                                    const JobAction *JA,
1298                                    const ActionList *&Inputs) {
1299  const Tool *ToolForJob = 0;
1300
1301  // See if we should look for a compiler with an integrated assembler. We match
1302  // bottom up, so what we are actually looking for is an assembler job with a
1303  // compiler input.
1304
1305  if (TC->useIntegratedAs() &&
1306      !C.getArgs().hasArg(options::OPT_save_temps) &&
1307      isa<AssembleJobAction>(JA) &&
1308      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1309    const Tool *Compiler =
1310      TC->SelectTool(cast<JobAction>(**Inputs->begin()));
1311    if (!Compiler)
1312      return NULL;
1313    if (Compiler->hasIntegratedAssembler()) {
1314      Inputs = &(*Inputs)[0]->getInputs();
1315      ToolForJob = Compiler;
1316    }
1317  }
1318
1319  // Otherwise use the tool for the current job.
1320  if (!ToolForJob)
1321    ToolForJob = TC->SelectTool(*JA);
1322
1323  // See if we should use an integrated preprocessor. We do so when we have
1324  // exactly one input, since this is the only use case we care about
1325  // (irrelevant since we don't support combine yet).
1326  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1327      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1328      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1329      !C.getArgs().hasArg(options::OPT_save_temps) &&
1330      !C.getArgs().hasArg(options::OPT_rewrite_objc) &&
1331      ToolForJob->hasIntegratedCPP())
1332    Inputs = &(*Inputs)[0]->getInputs();
1333
1334  return ToolForJob;
1335}
1336
1337void Driver::BuildJobsForAction(Compilation &C,
1338                                const Action *A,
1339                                const ToolChain *TC,
1340                                const char *BoundArch,
1341                                bool AtTopLevel,
1342                                bool MultipleArchs,
1343                                const char *LinkingOutput,
1344                                InputInfo &Result) const {
1345  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1346
1347  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1348    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1349    // just using Args was better?
1350    const Arg &Input = IA->getInputArg();
1351    Input.claim();
1352    if (Input.getOption().matches(options::OPT_INPUT)) {
1353      const char *Name = Input.getValue();
1354      Result = InputInfo(Name, A->getType(), Name);
1355    } else
1356      Result = InputInfo(&Input, A->getType(), "");
1357    return;
1358  }
1359
1360  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1361    const ToolChain *TC;
1362    const char *ArchName = BAA->getArchName();
1363
1364    if (ArchName)
1365      TC = &getToolChain(C.getArgs(), ArchName);
1366    else
1367      TC = &C.getDefaultToolChain();
1368
1369    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1370                       AtTopLevel, MultipleArchs, LinkingOutput, Result);
1371    return;
1372  }
1373
1374  const ActionList *Inputs = &A->getInputs();
1375
1376  const JobAction *JA = cast<JobAction>(A);
1377  const Tool *T = SelectToolForJob(C, TC, JA, Inputs);
1378  if (!T)
1379    return;
1380
1381  // Only use pipes when there is exactly one input.
1382  InputInfoList InputInfos;
1383  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1384       it != ie; ++it) {
1385    // Treat dsymutil and verify sub-jobs as being at the top-level too, they
1386    // shouldn't get temporary output names.
1387    // FIXME: Clean this up.
1388    bool SubJobAtTopLevel = false;
1389    if (AtTopLevel && (isa<DsymutilJobAction>(A) || isa<VerifyJobAction>(A)))
1390      SubJobAtTopLevel = true;
1391
1392    InputInfo II;
1393    BuildJobsForAction(C, *it, TC, BoundArch, SubJobAtTopLevel, MultipleArchs,
1394                       LinkingOutput, II);
1395    InputInfos.push_back(II);
1396  }
1397
1398  // Always use the first input as the base input.
1399  const char *BaseInput = InputInfos[0].getBaseInput();
1400
1401  // ... except dsymutil actions, which use their actual input as the base
1402  // input.
1403  if (JA->getType() == types::TY_dSYM)
1404    BaseInput = InputInfos[0].getFilename();
1405
1406  // Determine the place to write output to, if any.
1407  if (JA->getType() == types::TY_Nothing)
1408    Result = InputInfo(A->getType(), BaseInput);
1409  else
1410    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, BoundArch,
1411                                          AtTopLevel, MultipleArchs),
1412                       A->getType(), BaseInput);
1413
1414  if (CCCPrintBindings && !CCGenDiagnostics) {
1415    llvm::errs() << "# \"" << T->getToolChain().getTripleString() << '"'
1416                 << " - \"" << T->getName() << "\", inputs: [";
1417    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1418      llvm::errs() << InputInfos[i].getAsString();
1419      if (i + 1 != e)
1420        llvm::errs() << ", ";
1421    }
1422    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1423  } else {
1424    T->ConstructJob(C, *JA, Result, InputInfos,
1425                    C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1426  }
1427}
1428
1429const char *Driver::GetNamedOutputPath(Compilation &C,
1430                                       const JobAction &JA,
1431                                       const char *BaseInput,
1432                                       const char *BoundArch,
1433                                       bool AtTopLevel,
1434                                       bool MultipleArchs) const {
1435  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1436  // Output to a user requested destination?
1437  if (AtTopLevel && !isa<DsymutilJobAction>(JA) &&
1438      !isa<VerifyJobAction>(JA)) {
1439    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1440      return C.addResultFile(FinalOutput->getValue(), &JA);
1441  }
1442
1443  // Default to writing to stdout?
1444  if (AtTopLevel && !CCGenDiagnostics &&
1445      (isa<PreprocessJobAction>(JA) || JA.getType() == types::TY_ModuleFile))
1446    return "-";
1447
1448  // Output to a temporary file?
1449  if ((!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) ||
1450      CCGenDiagnostics) {
1451    StringRef Name = llvm::sys::path::filename(BaseInput);
1452    std::pair<StringRef, StringRef> Split = Name.split('.');
1453    std::string TmpName =
1454      GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1455    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1456  }
1457
1458  SmallString<128> BasePath(BaseInput);
1459  StringRef BaseName;
1460
1461  // Dsymutil actions should use the full path.
1462  if (isa<DsymutilJobAction>(JA) || isa<VerifyJobAction>(JA))
1463    BaseName = BasePath;
1464  else
1465    BaseName = llvm::sys::path::filename(BasePath);
1466
1467  // Determine what the derived output name should be.
1468  const char *NamedOutput;
1469  if (JA.getType() == types::TY_Image) {
1470    if (MultipleArchs && BoundArch) {
1471      SmallString<128> Output(DefaultImageName.c_str());
1472      Output += "-";
1473      Output.append(BoundArch);
1474      NamedOutput = C.getArgs().MakeArgString(Output.c_str());
1475    } else
1476      NamedOutput = DefaultImageName.c_str();
1477  } else {
1478    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1479    assert(Suffix && "All types used for output should have a suffix.");
1480
1481    std::string::size_type End = std::string::npos;
1482    if (!types::appendSuffixForType(JA.getType()))
1483      End = BaseName.rfind('.');
1484    SmallString<128> Suffixed(BaseName.substr(0, End));
1485    if (MultipleArchs && BoundArch) {
1486      Suffixed += "-";
1487      Suffixed.append(BoundArch);
1488    }
1489    Suffixed += '.';
1490    Suffixed += Suffix;
1491    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1492  }
1493
1494  // If we're saving temps and the temp file conflicts with the input file,
1495  // then avoid overwriting input file.
1496  if (!AtTopLevel && C.getArgs().hasArg(options::OPT_save_temps) &&
1497      NamedOutput == BaseName) {
1498
1499    bool SameFile = false;
1500    SmallString<256> Result;
1501    llvm::sys::fs::current_path(Result);
1502    llvm::sys::path::append(Result, BaseName);
1503    llvm::sys::fs::equivalent(BaseInput, Result.c_str(), SameFile);
1504    // Must share the same path to conflict.
1505    if (SameFile) {
1506      StringRef Name = llvm::sys::path::filename(BaseInput);
1507      std::pair<StringRef, StringRef> Split = Name.split('.');
1508      std::string TmpName =
1509        GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1510      return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1511    }
1512  }
1513
1514  // As an annoying special case, PCH generation doesn't strip the pathname.
1515  if (JA.getType() == types::TY_PCH) {
1516    llvm::sys::path::remove_filename(BasePath);
1517    if (BasePath.empty())
1518      BasePath = NamedOutput;
1519    else
1520      llvm::sys::path::append(BasePath, NamedOutput);
1521    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()), &JA);
1522  } else {
1523    return C.addResultFile(NamedOutput, &JA);
1524  }
1525}
1526
1527std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1528  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1529  // attempting to use this prefix when looking for file paths.
1530  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1531       ie = PrefixDirs.end(); it != ie; ++it) {
1532    std::string Dir(*it);
1533    if (Dir.empty())
1534      continue;
1535    if (Dir[0] == '=')
1536      Dir = SysRoot + Dir.substr(1);
1537    SmallString<128> P(Dir);
1538    llvm::sys::path::append(P, Name);
1539    if (llvm::sys::fs::exists(Twine(P)))
1540      return P.str();
1541  }
1542
1543  SmallString<128> P(ResourceDir);
1544  llvm::sys::path::append(P, Name);
1545  if (llvm::sys::fs::exists(Twine(P)))
1546    return P.str();
1547
1548  const ToolChain::path_list &List = TC.getFilePaths();
1549  for (ToolChain::path_list::const_iterator
1550         it = List.begin(), ie = List.end(); it != ie; ++it) {
1551    std::string Dir(*it);
1552    if (Dir.empty())
1553      continue;
1554    if (Dir[0] == '=')
1555      Dir = SysRoot + Dir.substr(1);
1556    SmallString<128> P(Dir);
1557    llvm::sys::path::append(P, Name);
1558    if (llvm::sys::fs::exists(Twine(P)))
1559      return P.str();
1560  }
1561
1562  return Name;
1563}
1564
1565std::string Driver::GetProgramPath(const char *Name,
1566                                   const ToolChain &TC) const {
1567  // FIXME: Needs a better variable than DefaultTargetTriple
1568  std::string TargetSpecificExecutable(DefaultTargetTriple + "-" + Name);
1569  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1570  // attempting to use this prefix when looking for program paths.
1571  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1572       ie = PrefixDirs.end(); it != ie; ++it) {
1573    bool IsDirectory;
1574    if (!llvm::sys::fs::is_directory(*it, IsDirectory) && IsDirectory) {
1575      SmallString<128> P(*it);
1576      llvm::sys::path::append(P, TargetSpecificExecutable);
1577      if (llvm::sys::fs::can_execute(Twine(P)))
1578        return P.str();
1579      llvm::sys::path::remove_filename(P);
1580      llvm::sys::path::append(P, Name);
1581      if (llvm::sys::fs::can_execute(Twine(P)))
1582        return P.str();
1583    } else {
1584      SmallString<128> P(*it + Name);
1585      if (llvm::sys::fs::can_execute(Twine(P)))
1586        return P.str();
1587    }
1588  }
1589
1590  const ToolChain::path_list &List = TC.getProgramPaths();
1591  for (ToolChain::path_list::const_iterator
1592         it = List.begin(), ie = List.end(); it != ie; ++it) {
1593    SmallString<128> P(*it);
1594    llvm::sys::path::append(P, TargetSpecificExecutable);
1595    if (llvm::sys::fs::can_execute(Twine(P)))
1596      return P.str();
1597    llvm::sys::path::remove_filename(P);
1598    llvm::sys::path::append(P, Name);
1599    if (llvm::sys::fs::can_execute(Twine(P)))
1600      return P.str();
1601  }
1602
1603  // If all else failed, search the path.
1604  std::string P(llvm::sys::FindProgramByName(TargetSpecificExecutable));
1605  if (!P.empty())
1606    return P;
1607
1608  P = llvm::sys::FindProgramByName(Name);
1609  if (!P.empty())
1610    return P;
1611
1612  return Name;
1613}
1614
1615std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
1616  const {
1617  SmallString<128> Path;
1618  llvm::error_code EC =
1619      llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
1620  if (EC) {
1621    Diag(clang::diag::err_unable_to_make_temp) << EC.message();
1622    return "";
1623  }
1624
1625  return Path.str();
1626}
1627
1628/// \brief Compute target triple from args.
1629///
1630/// This routine provides the logic to compute a target triple from various
1631/// args passed to the driver and the default triple string.
1632static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
1633                                        const ArgList &Args,
1634                                        StringRef DarwinArchName) {
1635  // FIXME: Already done in Compilation *Driver::BuildCompilation
1636  if (const Arg *A = Args.getLastArg(options::OPT_target))
1637    DefaultTargetTriple = A->getValue();
1638
1639  llvm::Triple Target(llvm::Triple::normalize(DefaultTargetTriple));
1640
1641  // Handle Darwin-specific options available here.
1642  if (Target.isOSDarwin()) {
1643    // If an explict Darwin arch name is given, that trumps all.
1644    if (!DarwinArchName.empty()) {
1645      Target.setArch(
1646        tools::darwin::getArchTypeForDarwinArchName(DarwinArchName));
1647      return Target;
1648    }
1649
1650    // Handle the Darwin '-arch' flag.
1651    if (Arg *A = Args.getLastArg(options::OPT_arch)) {
1652      llvm::Triple::ArchType DarwinArch
1653        = tools::darwin::getArchTypeForDarwinArchName(A->getValue());
1654      if (DarwinArch != llvm::Triple::UnknownArch)
1655        Target.setArch(DarwinArch);
1656    }
1657  }
1658
1659  // Handle pseudo-target flags '-EL' and '-EB'.
1660  if (Arg *A = Args.getLastArg(options::OPT_EL, options::OPT_EB)) {
1661    if (A->getOption().matches(options::OPT_EL)) {
1662      if (Target.getArch() == llvm::Triple::mips)
1663        Target.setArch(llvm::Triple::mipsel);
1664      else if (Target.getArch() == llvm::Triple::mips64)
1665        Target.setArch(llvm::Triple::mips64el);
1666    } else {
1667      if (Target.getArch() == llvm::Triple::mipsel)
1668        Target.setArch(llvm::Triple::mips);
1669      else if (Target.getArch() == llvm::Triple::mips64el)
1670        Target.setArch(llvm::Triple::mips64);
1671    }
1672  }
1673
1674  // Skip further flag support on OSes which don't support '-m32' or '-m64'.
1675  if (Target.getArchName() == "tce" ||
1676      Target.getOS() == llvm::Triple::AuroraUX ||
1677      Target.getOS() == llvm::Triple::Minix)
1678    return Target;
1679
1680  // Handle pseudo-target flags '-m32' and '-m64'.
1681  // FIXME: Should this information be in llvm::Triple?
1682  if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
1683    if (A->getOption().matches(options::OPT_m32)) {
1684      if (Target.getArch() == llvm::Triple::x86_64)
1685        Target.setArch(llvm::Triple::x86);
1686      if (Target.getArch() == llvm::Triple::ppc64)
1687        Target.setArch(llvm::Triple::ppc);
1688    } else {
1689      if (Target.getArch() == llvm::Triple::x86)
1690        Target.setArch(llvm::Triple::x86_64);
1691      if (Target.getArch() == llvm::Triple::ppc)
1692        Target.setArch(llvm::Triple::ppc64);
1693    }
1694  }
1695
1696  return Target;
1697}
1698
1699const ToolChain &Driver::getToolChain(const ArgList &Args,
1700                                      StringRef DarwinArchName) const {
1701  llvm::Triple Target = computeTargetTriple(DefaultTargetTriple, Args,
1702                                            DarwinArchName);
1703
1704  ToolChain *&TC = ToolChains[Target.str()];
1705  if (!TC) {
1706    switch (Target.getOS()) {
1707    case llvm::Triple::AuroraUX:
1708      TC = new toolchains::AuroraUX(*this, Target, Args);
1709      break;
1710    case llvm::Triple::Darwin:
1711    case llvm::Triple::MacOSX:
1712    case llvm::Triple::IOS:
1713      if (Target.getArch() == llvm::Triple::x86 ||
1714          Target.getArch() == llvm::Triple::x86_64 ||
1715          Target.getArch() == llvm::Triple::arm ||
1716          Target.getArch() == llvm::Triple::thumb)
1717        TC = new toolchains::DarwinClang(*this, Target, Args);
1718      else
1719        TC = new toolchains::Darwin_Generic_GCC(*this, Target, Args);
1720      break;
1721    case llvm::Triple::DragonFly:
1722      TC = new toolchains::DragonFly(*this, Target, Args);
1723      break;
1724    case llvm::Triple::OpenBSD:
1725      TC = new toolchains::OpenBSD(*this, Target, Args);
1726      break;
1727    case llvm::Triple::Bitrig:
1728      TC = new toolchains::Bitrig(*this, Target, Args);
1729      break;
1730    case llvm::Triple::NetBSD:
1731      TC = new toolchains::NetBSD(*this, Target, Args);
1732      break;
1733    case llvm::Triple::FreeBSD:
1734      TC = new toolchains::FreeBSD(*this, Target, Args);
1735      break;
1736    case llvm::Triple::Minix:
1737      TC = new toolchains::Minix(*this, Target, Args);
1738      break;
1739    case llvm::Triple::Linux:
1740      if (Target.getArch() == llvm::Triple::hexagon)
1741        TC = new toolchains::Hexagon_TC(*this, Target, Args);
1742      else
1743        TC = new toolchains::Linux(*this, Target, Args);
1744      break;
1745    case llvm::Triple::Solaris:
1746      TC = new toolchains::Solaris(*this, Target, Args);
1747      break;
1748    case llvm::Triple::Win32:
1749      TC = new toolchains::Windows(*this, Target, Args);
1750      break;
1751    case llvm::Triple::MinGW32:
1752      // FIXME: We need a MinGW toolchain. Fallthrough for now.
1753    default:
1754      // TCE is an OSless target
1755      if (Target.getArchName() == "tce") {
1756        TC = new toolchains::TCEToolChain(*this, Target, Args);
1757        break;
1758      }
1759      // If Hexagon is configured as an OSless target
1760      if (Target.getArch() == llvm::Triple::hexagon) {
1761        TC = new toolchains::Hexagon_TC(*this, Target, Args);
1762        break;
1763      }
1764      TC = new toolchains::Generic_GCC(*this, Target, Args);
1765      break;
1766    }
1767  }
1768  return *TC;
1769}
1770
1771bool Driver::ShouldUseClangCompiler(const JobAction &JA) const {
1772  // Check if user requested no clang, or clang doesn't understand this type (we
1773  // only handle single inputs for now).
1774  if (JA.size() != 1 ||
1775      !types::isAcceptedByClang((*JA.begin())->getType()))
1776    return false;
1777
1778  // Otherwise make sure this is an action clang understands.
1779  if (!isa<PreprocessJobAction>(JA) && !isa<PrecompileJobAction>(JA) &&
1780      !isa<CompileJobAction>(JA))
1781    return false;
1782
1783  return true;
1784}
1785
1786/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1787/// grouped values as integers. Numbers which are not provided are set to 0.
1788///
1789/// \return True if the entire string was parsed (9.2), or all groups were
1790/// parsed (10.3.5extrastuff).
1791bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1792                               unsigned &Minor, unsigned &Micro,
1793                               bool &HadExtra) {
1794  HadExtra = false;
1795
1796  Major = Minor = Micro = 0;
1797  if (*Str == '\0')
1798    return true;
1799
1800  char *End;
1801  Major = (unsigned) strtol(Str, &End, 10);
1802  if (*Str != '\0' && *End == '\0')
1803    return true;
1804  if (*End != '.')
1805    return false;
1806
1807  Str = End+1;
1808  Minor = (unsigned) strtol(Str, &End, 10);
1809  if (*Str != '\0' && *End == '\0')
1810    return true;
1811  if (*End != '.')
1812    return false;
1813
1814  Str = End+1;
1815  Micro = (unsigned) strtol(Str, &End, 10);
1816  if (*Str != '\0' && *End == '\0')
1817    return true;
1818  if (Str == End)
1819    return false;
1820  HadExtra = true;
1821  return true;
1822}
1823