Driver.cpp revision 33530b8e99085f736b0af5e1bc8fedaf80b5c90e 
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/ADT/StringSwitch.h"
25#include "llvm/Option/Arg.h"
26#include "llvm/Option/ArgList.h"
27#include "llvm/Option/OptTable.h"
28#include "llvm/Option/Option.h"
29#include "llvm/Option/OptSpecifier.h"
30#include "llvm/Support/Debug.h"
31#include "llvm/Support/ErrorHandling.h"
32#include "llvm/Support/FileSystem.h"
33#include "llvm/Support/Path.h"
34#include "llvm/Support/PrettyStackTrace.h"
35#include "llvm/Support/Program.h"
36#include "llvm/Support/raw_ostream.h"
37#include <map>
38
39// FIXME: It would prevent us from including llvm-config.h
40// if config.h were included before system_error.h.
41#include "clang/Config/config.h"
42
43using namespace clang::driver;
44using namespace clang;
45using namespace llvm::opt;
46
47Driver::Driver(StringRef ClangExecutable,
48               StringRef DefaultTargetTriple,
49               StringRef DefaultImageName,
50               DiagnosticsEngine &Diags)
51  : Opts(createDriverOptTable()), Diags(Diags), Mode(GCCMode),
52    ClangExecutable(ClangExecutable), SysRoot(DEFAULT_SYSROOT),
53    UseStdLib(true), DefaultTargetTriple(DefaultTargetTriple),
54    DefaultImageName(DefaultImageName),
55    DriverTitle("clang LLVM compiler"),
56    CCPrintOptionsFilename(0), CCPrintHeadersFilename(0),
57    CCLogDiagnosticsFilename(0),
58    CCCEcho(false), CCCPrintBindings(false),
59    CCPrintOptions(false), CCPrintHeaders(false), CCLogDiagnostics(false),
60    CCGenDiagnostics(false), CCCGenericGCCName(""), CheckInputsExist(true),
61    CCCUsePCH(true), SuppressMissingInputWarning(false) {
62
63  Name = llvm::sys::path::stem(ClangExecutable);
64  Dir  = llvm::sys::path::parent_path(ClangExecutable);
65
66  // Compute the path to the resource directory.
67  StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
68  SmallString<128> P(Dir);
69  if (ClangResourceDir != "")
70    llvm::sys::path::append(P, ClangResourceDir);
71  else
72    llvm::sys::path::append(P, "..", "lib", "clang", CLANG_VERSION_STRING);
73  ResourceDir = P.str();
74}
75
76Driver::~Driver() {
77  delete Opts;
78
79  for (llvm::StringMap<ToolChain *>::iterator I = ToolChains.begin(),
80                                              E = ToolChains.end();
81       I != E; ++I)
82    delete I->second;
83}
84
85void Driver::ParseDriverMode(ArrayRef<const char *> Args) {
86  const std::string OptName =
87    getOpts().getOption(options::OPT_driver_mode).getPrefixedName();
88
89  for (size_t I = 0, E = Args.size(); I != E; ++I) {
90    const StringRef Arg = Args[I];
91    if (!Arg.startswith(OptName))
92      continue;
93
94    const StringRef Value = Arg.drop_front(OptName.size());
95    const unsigned M = llvm::StringSwitch<unsigned>(Value)
96        .Case("gcc", GCCMode)
97        .Case("g++", GXXMode)
98        .Case("cpp", CPPMode)
99        .Default(~0U);
100
101    if (M != ~0U)
102      Mode = static_cast<DriverMode>(M);
103    else
104      Diag(diag::err_drv_unsupported_option_argument) << OptName << Value;
105  }
106}
107
108InputArgList *Driver::ParseArgStrings(ArrayRef<const char *> ArgList) {
109  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
110  unsigned MissingArgIndex, MissingArgCount;
111  InputArgList *Args = getOpts().ParseArgs(ArgList.begin(), ArgList.end(),
112                                           MissingArgIndex, MissingArgCount);
113
114  // Check for missing argument error.
115  if (MissingArgCount)
116    Diag(clang::diag::err_drv_missing_argument)
117      << Args->getArgString(MissingArgIndex) << MissingArgCount;
118
119  // Check for unsupported options.
120  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
121       it != ie; ++it) {
122    Arg *A = *it;
123    if (A->getOption().hasFlag(options::Unsupported)) {
124      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
125      continue;
126    }
127
128    // Warn about -mcpu= without an argument.
129    if (A->getOption().matches(options::OPT_mcpu_EQ) &&
130        A->containsValue("")) {
131      Diag(clang::diag::warn_drv_empty_joined_argument) <<
132        A->getAsString(*Args);
133    }
134  }
135
136  return Args;
137}
138
139// Determine which compilation mode we are in. We look for options which
140// affect the phase, starting with the earliest phases, and record which
141// option we used to determine the final phase.
142phases::ID Driver::getFinalPhase(const DerivedArgList &DAL, Arg **FinalPhaseArg)
143const {
144  Arg *PhaseArg = 0;
145  phases::ID FinalPhase;
146
147  // -{E,M,MM} only run the preprocessor.
148  if (CCCIsCPP() ||
149      (PhaseArg = DAL.getLastArg(options::OPT_E)) ||
150      (PhaseArg = DAL.getLastArg(options::OPT_M, options::OPT_MM))) {
151    FinalPhase = phases::Preprocess;
152
153    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
154  } else if ((PhaseArg = DAL.getLastArg(options::OPT_fsyntax_only)) ||
155             (PhaseArg = DAL.getLastArg(options::OPT_module_file_info)) ||
156             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_objc)) ||
157             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_legacy_objc)) ||
158             (PhaseArg = DAL.getLastArg(options::OPT__migrate)) ||
159             (PhaseArg = DAL.getLastArg(options::OPT__analyze,
160                                        options::OPT__analyze_auto)) ||
161             (PhaseArg = DAL.getLastArg(options::OPT_emit_ast)) ||
162             (PhaseArg = DAL.getLastArg(options::OPT_S))) {
163    FinalPhase = phases::Compile;
164
165    // -c only runs up to the assembler.
166  } else if ((PhaseArg = DAL.getLastArg(options::OPT_c))) {
167    FinalPhase = phases::Assemble;
168
169    // Otherwise do everything.
170  } else
171    FinalPhase = phases::Link;
172
173  if (FinalPhaseArg)
174    *FinalPhaseArg = PhaseArg;
175
176  return FinalPhase;
177}
178
179DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
180  DerivedArgList *DAL = new DerivedArgList(Args);
181
182  bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
183  for (ArgList::const_iterator it = Args.begin(),
184         ie = Args.end(); it != ie; ++it) {
185    const Arg *A = *it;
186
187    // Unfortunately, we have to parse some forwarding options (-Xassembler,
188    // -Xlinker, -Xpreprocessor) because we either integrate their functionality
189    // (assembler and preprocessor), or bypass a previous driver ('collect2').
190
191    // Rewrite linker options, to replace --no-demangle with a custom internal
192    // option.
193    if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
194         A->getOption().matches(options::OPT_Xlinker)) &&
195        A->containsValue("--no-demangle")) {
196      // Add the rewritten no-demangle argument.
197      DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_Xlinker__no_demangle));
198
199      // Add the remaining values as Xlinker arguments.
200      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
201        if (StringRef(A->getValue(i)) != "--no-demangle")
202          DAL->AddSeparateArg(A, Opts->getOption(options::OPT_Xlinker),
203                              A->getValue(i));
204
205      continue;
206    }
207
208    // Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
209    // some build systems. We don't try to be complete here because we don't
210    // care to encourage this usage model.
211    if (A->getOption().matches(options::OPT_Wp_COMMA) &&
212        (A->getValue(0) == StringRef("-MD") ||
213         A->getValue(0) == StringRef("-MMD"))) {
214      // Rewrite to -MD/-MMD along with -MF.
215      if (A->getValue(0) == StringRef("-MD"))
216        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MD));
217      else
218        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MMD));
219      if (A->getNumValues() == 2)
220        DAL->AddSeparateArg(A, Opts->getOption(options::OPT_MF),
221                            A->getValue(1));
222      continue;
223    }
224
225    // Rewrite reserved library names.
226    if (A->getOption().matches(options::OPT_l)) {
227      StringRef Value = A->getValue();
228
229      // Rewrite unless -nostdlib is present.
230      if (!HasNostdlib && Value == "stdc++") {
231        DAL->AddFlagArg(A, Opts->getOption(
232                              options::OPT_Z_reserved_lib_stdcxx));
233        continue;
234      }
235
236      // Rewrite unconditionally.
237      if (Value == "cc_kext") {
238        DAL->AddFlagArg(A, Opts->getOption(
239                              options::OPT_Z_reserved_lib_cckext));
240        continue;
241      }
242    }
243
244    DAL->append(*it);
245  }
246
247  // Add a default value of -mlinker-version=, if one was given and the user
248  // didn't specify one.
249#if defined(HOST_LINK_VERSION)
250  if (!Args.hasArg(options::OPT_mlinker_version_EQ)) {
251    DAL->AddJoinedArg(0, Opts->getOption(options::OPT_mlinker_version_EQ),
252                      HOST_LINK_VERSION);
253    DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
254  }
255#endif
256
257  return DAL;
258}
259
260Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
261  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
262
263  // FIXME: Handle environment options which affect driver behavior, somewhere
264  // (client?). GCC_EXEC_PREFIX, LPATH, CC_PRINT_OPTIONS.
265
266  if (char *env = ::getenv("COMPILER_PATH")) {
267    StringRef CompilerPath = env;
268    while (!CompilerPath.empty()) {
269      std::pair<StringRef, StringRef> Split
270        = CompilerPath.split(llvm::sys::EnvPathSeparator);
271      PrefixDirs.push_back(Split.first);
272      CompilerPath = Split.second;
273    }
274  }
275
276  // We look for the driver mode option early, because the mode can affect
277  // how other options are parsed.
278  ParseDriverMode(ArgList.slice(1));
279
280  // FIXME: What are we going to do with -V and -b?
281
282  // FIXME: This stuff needs to go into the Compilation, not the driver.
283  bool CCCPrintOptions, CCCPrintActions;
284
285  InputArgList *Args = ParseArgStrings(ArgList.slice(1));
286
287  // -no-canonical-prefixes is used very early in main.
288  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
289
290  // Ignore -pipe.
291  Args->ClaimAllArgs(options::OPT_pipe);
292
293  // Extract -ccc args.
294  //
295  // FIXME: We need to figure out where this behavior should live. Most of it
296  // should be outside in the client; the parts that aren't should have proper
297  // options, either by introducing new ones or by overloading gcc ones like -V
298  // or -b.
299  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
300  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
301  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
302  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
303  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
304    CCCGenericGCCName = A->getValue();
305  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
306                            options::OPT_ccc_pch_is_pth);
307  // FIXME: DefaultTargetTriple is used by the target-prefixed calls to as/ld
308  // and getToolChain is const.
309  if (const Arg *A = Args->getLastArg(options::OPT_target))
310    DefaultTargetTriple = A->getValue();
311  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
312    Dir = InstalledDir = A->getValue();
313  for (arg_iterator it = Args->filtered_begin(options::OPT_B),
314         ie = Args->filtered_end(); it != ie; ++it) {
315    const Arg *A = *it;
316    A->claim();
317    PrefixDirs.push_back(A->getValue(0));
318  }
319  if (const Arg *A = Args->getLastArg(options::OPT__sysroot_EQ))
320    SysRoot = A->getValue();
321  if (const Arg *A = Args->getLastArg(options::OPT__dyld_prefix_EQ))
322    DyldPrefix = A->getValue();
323  if (Args->hasArg(options::OPT_nostdlib))
324    UseStdLib = false;
325
326  if (const Arg *A = Args->getLastArg(options::OPT_resource_dir))
327    ResourceDir = A->getValue();
328
329  // Perform the default argument translations.
330  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
331
332  // Owned by the host.
333  const ToolChain &TC = getToolChain(*Args);
334
335  // The compilation takes ownership of Args.
336  Compilation *C = new Compilation(*this, TC, Args, TranslatedArgs);
337
338  // FIXME: This behavior shouldn't be here.
339  if (CCCPrintOptions) {
340    PrintOptions(C->getInputArgs());
341    return C;
342  }
343
344  if (!HandleImmediateArgs(*C))
345    return C;
346
347  // Construct the list of inputs.
348  InputList Inputs;
349  BuildInputs(C->getDefaultToolChain(), C->getArgs(), Inputs);
350
351  // Construct the list of abstract actions to perform for this compilation. On
352  // Darwin target OSes this uses the driver-driver and universal actions.
353  if (TC.getTriple().isOSDarwin())
354    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
355                          Inputs, C->getActions());
356  else
357    BuildActions(C->getDefaultToolChain(), C->getArgs(), Inputs,
358                 C->getActions());
359
360  if (CCCPrintActions) {
361    PrintActions(*C);
362    return C;
363  }
364
365  BuildJobs(*C);
366
367  return C;
368}
369
370// When clang crashes, produce diagnostic information including the fully
371// preprocessed source file(s).  Request that the developer attach the
372// diagnostic information to a bug report.
373void Driver::generateCompilationDiagnostics(Compilation &C,
374                                            const Command *FailingCommand) {
375  if (C.getArgs().hasArg(options::OPT_fno_crash_diagnostics))
376    return;
377
378  // Don't try to generate diagnostics for link or dsymutil jobs.
379  if (FailingCommand && (FailingCommand->getCreator().isLinkJob() ||
380                         FailingCommand->getCreator().isDsymutilJob()))
381    return;
382
383  // Print the version of the compiler.
384  PrintVersion(C, llvm::errs());
385
386  Diag(clang::diag::note_drv_command_failed_diag_msg)
387    << "PLEASE submit a bug report to " BUG_REPORT_URL " and include the "
388    "crash backtrace, preprocessed source, and associated run script.";
389
390  // Suppress driver output and emit preprocessor output to temp file.
391  Mode = CPPMode;
392  CCGenDiagnostics = true;
393  C.getArgs().AddFlagArg(0, Opts->getOption(options::OPT_frewrite_includes));
394
395  // Save the original job command(s).
396  std::string Cmd;
397  llvm::raw_string_ostream OS(Cmd);
398  if (FailingCommand)
399    C.PrintDiagnosticJob(OS, *FailingCommand);
400  else
401    // Crash triggered by FORCE_CLANG_DIAGNOSTICS_CRASH, which doesn't have an
402    // associated FailingCommand, so just pass all jobs.
403    C.PrintDiagnosticJob(OS, C.getJobs());
404  OS.flush();
405
406  // Keep track of whether we produce any errors while trying to produce
407  // preprocessed sources.
408  DiagnosticErrorTrap Trap(Diags);
409
410  // Suppress tool output.
411  C.initCompilationForDiagnostics();
412
413  // Construct the list of inputs.
414  InputList Inputs;
415  BuildInputs(C.getDefaultToolChain(), C.getArgs(), Inputs);
416
417  for (InputList::iterator it = Inputs.begin(), ie = Inputs.end(); it != ie;) {
418    bool IgnoreInput = false;
419
420    // Ignore input from stdin or any inputs that cannot be preprocessed.
421    if (!strcmp(it->second->getValue(), "-")) {
422      Diag(clang::diag::note_drv_command_failed_diag_msg)
423        << "Error generating preprocessed source(s) - ignoring input from stdin"
424        ".";
425      IgnoreInput = true;
426    } else if (types::getPreprocessedType(it->first) == types::TY_INVALID) {
427      IgnoreInput = true;
428    }
429
430    if (IgnoreInput) {
431      it = Inputs.erase(it);
432      ie = Inputs.end();
433    } else {
434      ++it;
435    }
436  }
437
438  if (Inputs.empty()) {
439    Diag(clang::diag::note_drv_command_failed_diag_msg)
440      << "Error generating preprocessed source(s) - no preprocessable inputs.";
441    return;
442  }
443
444  // Don't attempt to generate preprocessed files if multiple -arch options are
445  // used, unless they're all duplicates.
446  llvm::StringSet<> ArchNames;
447  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
448       it != ie; ++it) {
449    Arg *A = *it;
450    if (A->getOption().matches(options::OPT_arch)) {
451      StringRef ArchName = A->getValue();
452      ArchNames.insert(ArchName);
453    }
454  }
455  if (ArchNames.size() > 1) {
456    Diag(clang::diag::note_drv_command_failed_diag_msg)
457      << "Error generating preprocessed source(s) - cannot generate "
458      "preprocessed source with multiple -arch options.";
459    return;
460  }
461
462  // Construct the list of abstract actions to perform for this compilation. On
463  // Darwin OSes this uses the driver-driver and builds universal actions.
464  const ToolChain &TC = C.getDefaultToolChain();
465  if (TC.getTriple().isOSDarwin())
466    BuildUniversalActions(TC, C.getArgs(), Inputs, C.getActions());
467  else
468    BuildActions(TC, C.getArgs(), Inputs, C.getActions());
469
470  BuildJobs(C);
471
472  // If there were errors building the compilation, quit now.
473  if (Trap.hasErrorOccurred()) {
474    Diag(clang::diag::note_drv_command_failed_diag_msg)
475      << "Error generating preprocessed source(s).";
476    return;
477  }
478
479  // Generate preprocessed output.
480  SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
481  C.ExecuteJob(C.getJobs(), FailingCommands);
482
483  // If the command succeeded, we are done.
484  if (FailingCommands.empty()) {
485    Diag(clang::diag::note_drv_command_failed_diag_msg)
486      << "\n********************\n\n"
487      "PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:\n"
488      "Preprocessed source(s) and associated run script(s) are located at:";
489    ArgStringList Files = C.getTempFiles();
490    for (ArgStringList::const_iterator it = Files.begin(), ie = Files.end();
491         it != ie; ++it) {
492      Diag(clang::diag::note_drv_command_failed_diag_msg) << *it;
493
494      std::string Err;
495      std::string Script = StringRef(*it).rsplit('.').first;
496      Script += ".sh";
497      llvm::raw_fd_ostream ScriptOS(
498          Script.c_str(), Err, llvm::sys::fs::F_Excl | llvm::sys::fs::F_Binary);
499      if (!Err.empty()) {
500        Diag(clang::diag::note_drv_command_failed_diag_msg)
501          << "Error generating run script: " + Script + " " + Err;
502      } else {
503        // Append the new filename with correct preprocessed suffix.
504        size_t I, E;
505        I = Cmd.find("-main-file-name ");
506        assert (I != std::string::npos && "Expected to find -main-file-name");
507        I += 16;
508        E = Cmd.find(" ", I);
509        assert (E != std::string::npos && "-main-file-name missing argument?");
510        StringRef OldFilename = StringRef(Cmd).slice(I, E);
511        StringRef NewFilename = llvm::sys::path::filename(*it);
512        I = StringRef(Cmd).rfind(OldFilename);
513        E = I + OldFilename.size();
514        I = Cmd.rfind(" ", I) + 1;
515        Cmd.replace(I, E - I, NewFilename.data(), NewFilename.size());
516        ScriptOS << Cmd;
517        Diag(clang::diag::note_drv_command_failed_diag_msg) << Script;
518      }
519    }
520    Diag(clang::diag::note_drv_command_failed_diag_msg)
521      << "\n\n********************";
522  } else {
523    // Failure, remove preprocessed files.
524    if (!C.getArgs().hasArg(options::OPT_save_temps))
525      C.CleanupFileList(C.getTempFiles(), true);
526
527    Diag(clang::diag::note_drv_command_failed_diag_msg)
528      << "Error generating preprocessed source(s).";
529  }
530}
531
532int Driver::ExecuteCompilation(const Compilation &C,
533    SmallVectorImpl< std::pair<int, const Command *> > &FailingCommands) const {
534  // Just print if -### was present.
535  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
536    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
537    return 0;
538  }
539
540  // If there were errors building the compilation, quit now.
541  if (Diags.hasErrorOccurred())
542    return 1;
543
544  C.ExecuteJob(C.getJobs(), FailingCommands);
545
546  // Remove temp files.
547  C.CleanupFileList(C.getTempFiles());
548
549  // If the command succeeded, we are done.
550  if (FailingCommands.empty())
551    return 0;
552
553  // Otherwise, remove result files and print extra information about abnormal
554  // failures.
555  for (SmallVectorImpl< std::pair<int, const Command *> >::iterator it =
556         FailingCommands.begin(), ie = FailingCommands.end(); it != ie; ++it) {
557    int Res = it->first;
558    const Command *FailingCommand = it->second;
559
560    // Remove result files if we're not saving temps.
561    if (!C.getArgs().hasArg(options::OPT_save_temps)) {
562      const JobAction *JA = cast<JobAction>(&FailingCommand->getSource());
563      C.CleanupFileMap(C.getResultFiles(), JA, true);
564
565      // Failure result files are valid unless we crashed.
566      if (Res < 0)
567        C.CleanupFileMap(C.getFailureResultFiles(), JA, true);
568    }
569
570    // Print extra information about abnormal failures, if possible.
571    //
572    // This is ad-hoc, but we don't want to be excessively noisy. If the result
573    // status was 1, assume the command failed normally. In particular, if it
574    // was the compiler then assume it gave a reasonable error code. Failures
575    // in other tools are less common, and they generally have worse
576    // diagnostics, so always print the diagnostic there.
577    const Tool &FailingTool = FailingCommand->getCreator();
578
579    if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
580      // FIXME: See FIXME above regarding result code interpretation.
581      if (Res < 0)
582        Diag(clang::diag::err_drv_command_signalled)
583          << FailingTool.getShortName();
584      else
585        Diag(clang::diag::err_drv_command_failed)
586          << FailingTool.getShortName() << Res;
587    }
588  }
589  return 0;
590}
591
592void Driver::PrintOptions(const ArgList &Args) const {
593  unsigned i = 0;
594  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
595       it != ie; ++it, ++i) {
596    Arg *A = *it;
597    llvm::errs() << "Option " << i << " - "
598                 << "Name: \"" << A->getOption().getPrefixedName() << "\", "
599                 << "Values: {";
600    for (unsigned j = 0; j < A->getNumValues(); ++j) {
601      if (j)
602        llvm::errs() << ", ";
603      llvm::errs() << '"' << A->getValue(j) << '"';
604    }
605    llvm::errs() << "}\n";
606  }
607}
608
609void Driver::PrintHelp(bool ShowHidden) const {
610  getOpts().PrintHelp(
611      llvm::outs(), Name.c_str(), DriverTitle.c_str(), /*Include*/ 0,
612      /*Exclude*/ options::NoDriverOption | (ShowHidden ? 0 : HelpHidden));
613}
614
615void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
616  // FIXME: The following handlers should use a callback mechanism, we don't
617  // know what the client would like to do.
618  OS << getClangFullVersion() << '\n';
619  const ToolChain &TC = C.getDefaultToolChain();
620  OS << "Target: " << TC.getTripleString() << '\n';
621
622  // Print the threading model.
623  //
624  // FIXME: Implement correctly.
625  OS << "Thread model: " << "posix" << '\n';
626}
627
628/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
629/// option.
630static void PrintDiagnosticCategories(raw_ostream &OS) {
631  // Skip the empty category.
632  for (unsigned i = 1, max = DiagnosticIDs::getNumberOfCategories();
633       i != max; ++i)
634    OS << i << ',' << DiagnosticIDs::getCategoryNameFromID(i) << '\n';
635}
636
637bool Driver::HandleImmediateArgs(const Compilation &C) {
638  // The order these options are handled in gcc is all over the place, but we
639  // don't expect inconsistencies w.r.t. that to matter in practice.
640
641  if (C.getArgs().hasArg(options::OPT_dumpmachine)) {
642    llvm::outs() << C.getDefaultToolChain().getTripleString() << '\n';
643    return false;
644  }
645
646  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
647    // Since -dumpversion is only implemented for pedantic GCC compatibility, we
648    // return an answer which matches our definition of __VERSION__.
649    //
650    // If we want to return a more correct answer some day, then we should
651    // introduce a non-pedantically GCC compatible mode to Clang in which we
652    // provide sensible definitions for -dumpversion, __VERSION__, etc.
653    llvm::outs() << "4.2.1\n";
654    return false;
655  }
656
657  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
658    PrintDiagnosticCategories(llvm::outs());
659    return false;
660  }
661
662  if (C.getArgs().hasArg(options::OPT_help) ||
663      C.getArgs().hasArg(options::OPT__help_hidden)) {
664    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
665    return false;
666  }
667
668  if (C.getArgs().hasArg(options::OPT__version)) {
669    // Follow gcc behavior and use stdout for --version and stderr for -v.
670    PrintVersion(C, llvm::outs());
671    return false;
672  }
673
674  if (C.getArgs().hasArg(options::OPT_v) ||
675      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
676    PrintVersion(C, llvm::errs());
677    SuppressMissingInputWarning = true;
678  }
679
680  const ToolChain &TC = C.getDefaultToolChain();
681  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
682    llvm::outs() << "programs: =";
683    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
684           ie = TC.getProgramPaths().end(); it != ie; ++it) {
685      if (it != TC.getProgramPaths().begin())
686        llvm::outs() << ':';
687      llvm::outs() << *it;
688    }
689    llvm::outs() << "\n";
690    llvm::outs() << "libraries: =" << ResourceDir;
691
692    StringRef sysroot = C.getSysRoot();
693
694    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
695           ie = TC.getFilePaths().end(); it != ie; ++it) {
696      llvm::outs() << ':';
697      const char *path = it->c_str();
698      if (path[0] == '=')
699        llvm::outs() << sysroot << path + 1;
700      else
701        llvm::outs() << path;
702    }
703    llvm::outs() << "\n";
704    return false;
705  }
706
707  // FIXME: The following handlers should use a callback mechanism, we don't
708  // know what the client would like to do.
709  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
710    llvm::outs() << GetFilePath(A->getValue(), TC) << "\n";
711    return false;
712  }
713
714  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
715    llvm::outs() << GetProgramPath(A->getValue(), TC) << "\n";
716    return false;
717  }
718
719  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
720    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
721    return false;
722  }
723
724  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
725    // FIXME: We need tool chain support for this.
726    llvm::outs() << ".;\n";
727
728    switch (C.getDefaultToolChain().getTriple().getArch()) {
729    default:
730      break;
731
732    case llvm::Triple::x86_64:
733      llvm::outs() << "x86_64;@m64" << "\n";
734      break;
735
736    case llvm::Triple::ppc64:
737      llvm::outs() << "ppc64;@m64" << "\n";
738      break;
739    }
740    return false;
741  }
742
743  // FIXME: What is the difference between print-multi-directory and
744  // print-multi-os-directory?
745  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
746      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
747    switch (C.getDefaultToolChain().getTriple().getArch()) {
748    default:
749    case llvm::Triple::x86:
750    case llvm::Triple::ppc:
751      llvm::outs() << "." << "\n";
752      break;
753
754    case llvm::Triple::x86_64:
755      llvm::outs() << "x86_64" << "\n";
756      break;
757
758    case llvm::Triple::ppc64:
759      llvm::outs() << "ppc64" << "\n";
760      break;
761    }
762    return false;
763  }
764
765  return true;
766}
767
768static unsigned PrintActions1(const Compilation &C, Action *A,
769                              std::map<Action*, unsigned> &Ids) {
770  if (Ids.count(A))
771    return Ids[A];
772
773  std::string str;
774  llvm::raw_string_ostream os(str);
775
776  os << Action::getClassName(A->getKind()) << ", ";
777  if (InputAction *IA = dyn_cast<InputAction>(A)) {
778    os << "\"" << IA->getInputArg().getValue() << "\"";
779  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
780    os << '"' << BIA->getArchName() << '"'
781       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
782  } else {
783    os << "{";
784    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
785      os << PrintActions1(C, *it, Ids);
786      ++it;
787      if (it != ie)
788        os << ", ";
789    }
790    os << "}";
791  }
792
793  unsigned Id = Ids.size();
794  Ids[A] = Id;
795  llvm::errs() << Id << ": " << os.str() << ", "
796               << types::getTypeName(A->getType()) << "\n";
797
798  return Id;
799}
800
801void Driver::PrintActions(const Compilation &C) const {
802  std::map<Action*, unsigned> Ids;
803  for (ActionList::const_iterator it = C.getActions().begin(),
804         ie = C.getActions().end(); it != ie; ++it)
805    PrintActions1(C, *it, Ids);
806}
807
808/// \brief Check whether the given input tree contains any compilation or
809/// assembly actions.
810static bool ContainsCompileOrAssembleAction(const Action *A) {
811  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
812    return true;
813
814  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
815    if (ContainsCompileOrAssembleAction(*it))
816      return true;
817
818  return false;
819}
820
821void Driver::BuildUniversalActions(const ToolChain &TC,
822                                   const DerivedArgList &Args,
823                                   const InputList &BAInputs,
824                                   ActionList &Actions) const {
825  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
826  // Collect the list of architectures. Duplicates are allowed, but should only
827  // be handled once (in the order seen).
828  llvm::StringSet<> ArchNames;
829  SmallVector<const char *, 4> Archs;
830  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
831       it != ie; ++it) {
832    Arg *A = *it;
833
834    if (A->getOption().matches(options::OPT_arch)) {
835      // Validate the option here; we don't save the type here because its
836      // particular spelling may participate in other driver choices.
837      llvm::Triple::ArchType Arch =
838        tools::darwin::getArchTypeForDarwinArchName(A->getValue());
839      if (Arch == llvm::Triple::UnknownArch) {
840        Diag(clang::diag::err_drv_invalid_arch_name)
841          << A->getAsString(Args);
842        continue;
843      }
844
845      A->claim();
846      if (ArchNames.insert(A->getValue()))
847        Archs.push_back(A->getValue());
848    }
849  }
850
851  // When there is no explicit arch for this platform, make sure we still bind
852  // the architecture (to the default) so that -Xarch_ is handled correctly.
853  if (!Archs.size())
854    Archs.push_back(Args.MakeArgString(TC.getDefaultUniversalArchName()));
855
856  ActionList SingleActions;
857  BuildActions(TC, Args, BAInputs, SingleActions);
858
859  // Add in arch bindings for every top level action, as well as lipo and
860  // dsymutil steps if needed.
861  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
862    Action *Act = SingleActions[i];
863
864    // Make sure we can lipo this kind of output. If not (and it is an actual
865    // output) then we disallow, since we can't create an output file with the
866    // right name without overwriting it. We could remove this oddity by just
867    // changing the output names to include the arch, which would also fix
868    // -save-temps. Compatibility wins for now.
869
870    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
871      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
872        << types::getTypeName(Act->getType());
873
874    ActionList Inputs;
875    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
876      Inputs.push_back(new BindArchAction(Act, Archs[i]));
877      if (i != 0)
878        Inputs.back()->setOwnsInputs(false);
879    }
880
881    // Lipo if necessary, we do it this way because we need to set the arch flag
882    // so that -Xarch_ gets overwritten.
883    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
884      Actions.append(Inputs.begin(), Inputs.end());
885    else
886      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
887
888    // Handle debug info queries.
889    Arg *A = Args.getLastArg(options::OPT_g_Group);
890    if (A && !A->getOption().matches(options::OPT_g0) &&
891        !A->getOption().matches(options::OPT_gstabs) &&
892        ContainsCompileOrAssembleAction(Actions.back())) {
893
894      // Add a 'dsymutil' step if necessary, when debug info is enabled and we
895      // have a compile input. We need to run 'dsymutil' ourselves in such cases
896      // because the debug info will refer to a temporary object file which
897      // will be removed at the end of the compilation process.
898      if (Act->getType() == types::TY_Image) {
899        ActionList Inputs;
900        Inputs.push_back(Actions.back());
901        Actions.pop_back();
902        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
903      }
904
905      // Verify the output (debug information only) if we passed '-verify'.
906      if (Args.hasArg(options::OPT_verify)) {
907        ActionList VerifyInputs;
908        VerifyInputs.push_back(Actions.back());
909        Actions.pop_back();
910        Actions.push_back(new VerifyJobAction(VerifyInputs,
911                                              types::TY_Nothing));
912      }
913    }
914  }
915}
916
917// Construct a the list of inputs and their types.
918void Driver::BuildInputs(const ToolChain &TC, const DerivedArgList &Args,
919                         InputList &Inputs) const {
920  // Track the current user specified (-x) input. We also explicitly track the
921  // argument used to set the type; we only want to claim the type when we
922  // actually use it, so we warn about unused -x arguments.
923  types::ID InputType = types::TY_Nothing;
924  Arg *InputTypeArg = 0;
925
926  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
927       it != ie; ++it) {
928    Arg *A = *it;
929
930    if (A->getOption().getKind() == Option::InputClass) {
931      const char *Value = A->getValue();
932      types::ID Ty = types::TY_INVALID;
933
934      // Infer the input type if necessary.
935      if (InputType == types::TY_Nothing) {
936        // If there was an explicit arg for this, claim it.
937        if (InputTypeArg)
938          InputTypeArg->claim();
939
940        // stdin must be handled specially.
941        if (memcmp(Value, "-", 2) == 0) {
942          // If running with -E, treat as a C input (this changes the builtin
943          // macros, for example). This may be overridden by -ObjC below.
944          //
945          // Otherwise emit an error but still use a valid type to avoid
946          // spurious errors (e.g., no inputs).
947          if (!Args.hasArgNoClaim(options::OPT_E) && !CCCIsCPP())
948            Diag(clang::diag::err_drv_unknown_stdin_type);
949          Ty = types::TY_C;
950        } else {
951          // Otherwise lookup by extension.
952          // Fallback is C if invoked as C preprocessor or Object otherwise.
953          // We use a host hook here because Darwin at least has its own
954          // idea of what .s is.
955          if (const char *Ext = strrchr(Value, '.'))
956            Ty = TC.LookupTypeForExtension(Ext + 1);
957
958          if (Ty == types::TY_INVALID) {
959            if (CCCIsCPP())
960              Ty = types::TY_C;
961            else
962              Ty = types::TY_Object;
963          }
964
965          // If the driver is invoked as C++ compiler (like clang++ or c++) it
966          // should autodetect some input files as C++ for g++ compatibility.
967          if (CCCIsCXX()) {
968            types::ID OldTy = Ty;
969            Ty = types::lookupCXXTypeForCType(Ty);
970
971            if (Ty != OldTy)
972              Diag(clang::diag::warn_drv_treating_input_as_cxx)
973                << getTypeName(OldTy) << getTypeName(Ty);
974          }
975        }
976
977        // -ObjC and -ObjC++ override the default language, but only for "source
978        // files". We just treat everything that isn't a linker input as a
979        // source file.
980        //
981        // FIXME: Clean this up if we move the phase sequence into the type.
982        if (Ty != types::TY_Object) {
983          if (Args.hasArg(options::OPT_ObjC))
984            Ty = types::TY_ObjC;
985          else if (Args.hasArg(options::OPT_ObjCXX))
986            Ty = types::TY_ObjCXX;
987        }
988      } else {
989        assert(InputTypeArg && "InputType set w/o InputTypeArg");
990        InputTypeArg->claim();
991        Ty = InputType;
992      }
993
994      // Check that the file exists, if enabled.
995      if (CheckInputsExist && memcmp(Value, "-", 2) != 0) {
996        SmallString<64> Path(Value);
997        if (Arg *WorkDir = Args.getLastArg(options::OPT_working_directory)) {
998          if (!llvm::sys::path::is_absolute(Path.str())) {
999            SmallString<64> Directory(WorkDir->getValue());
1000            llvm::sys::path::append(Directory, Value);
1001            Path.assign(Directory);
1002          }
1003        }
1004
1005        if (!llvm::sys::fs::exists(Twine(Path)))
1006          Diag(clang::diag::err_drv_no_such_file) << Path.str();
1007        else
1008          Inputs.push_back(std::make_pair(Ty, A));
1009      } else
1010        Inputs.push_back(std::make_pair(Ty, A));
1011
1012    } else if (A->getOption().hasFlag(options::LinkerInput)) {
1013      // Just treat as object type, we could make a special type for this if
1014      // necessary.
1015      Inputs.push_back(std::make_pair(types::TY_Object, A));
1016
1017    } else if (A->getOption().matches(options::OPT_x)) {
1018      InputTypeArg = A;
1019      InputType = types::lookupTypeForTypeSpecifier(A->getValue());
1020      A->claim();
1021
1022      // Follow gcc behavior and treat as linker input for invalid -x
1023      // options. Its not clear why we shouldn't just revert to unknown; but
1024      // this isn't very important, we might as well be bug compatible.
1025      if (!InputType) {
1026        Diag(clang::diag::err_drv_unknown_language) << A->getValue();
1027        InputType = types::TY_Object;
1028      }
1029    }
1030  }
1031  if (CCCIsCPP() && Inputs.empty()) {
1032    // If called as standalone preprocessor, stdin is processed
1033    // if no other input is present.
1034    unsigned Index = Args.getBaseArgs().MakeIndex("-");
1035    Arg *A = Opts->ParseOneArg(Args, Index);
1036    A->claim();
1037    Inputs.push_back(std::make_pair(types::TY_C, A));
1038  }
1039}
1040
1041void Driver::BuildActions(const ToolChain &TC, const DerivedArgList &Args,
1042                          const InputList &Inputs, ActionList &Actions) const {
1043  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
1044
1045  if (!SuppressMissingInputWarning && Inputs.empty()) {
1046    Diag(clang::diag::err_drv_no_input_files);
1047    return;
1048  }
1049
1050  Arg *FinalPhaseArg;
1051  phases::ID FinalPhase = getFinalPhase(Args, &FinalPhaseArg);
1052
1053  // Reject -Z* at the top level, these options should never have been exposed
1054  // by gcc.
1055  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
1056    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
1057
1058  // Construct the actions to perform.
1059  ActionList LinkerInputs;
1060  ActionList SplitInputs;
1061  llvm::SmallVector<phases::ID, phases::MaxNumberOfPhases> PL;
1062  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1063    types::ID InputType = Inputs[i].first;
1064    const Arg *InputArg = Inputs[i].second;
1065
1066    PL.clear();
1067    types::getCompilationPhases(InputType, PL);
1068
1069    // If the first step comes after the final phase we are doing as part of
1070    // this compilation, warn the user about it.
1071    phases::ID InitialPhase = PL[0];
1072    if (InitialPhase > FinalPhase) {
1073      // Claim here to avoid the more general unused warning.
1074      InputArg->claim();
1075
1076      // Suppress all unused style warnings with -Qunused-arguments
1077      if (Args.hasArg(options::OPT_Qunused_arguments))
1078        continue;
1079
1080      // Special case when final phase determined by binary name, rather than
1081      // by a command-line argument with a corresponding Arg.
1082      if (CCCIsCPP())
1083        Diag(clang::diag::warn_drv_input_file_unused_by_cpp)
1084          << InputArg->getAsString(Args)
1085          << getPhaseName(InitialPhase);
1086      // Special case '-E' warning on a previously preprocessed file to make
1087      // more sense.
1088      else if (InitialPhase == phases::Compile &&
1089               FinalPhase == phases::Preprocess &&
1090               getPreprocessedType(InputType) == types::TY_INVALID)
1091        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
1092          << InputArg->getAsString(Args)
1093          << !!FinalPhaseArg
1094          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1095      else
1096        Diag(clang::diag::warn_drv_input_file_unused)
1097          << InputArg->getAsString(Args)
1098          << getPhaseName(InitialPhase)
1099          << !!FinalPhaseArg
1100          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1101      continue;
1102    }
1103
1104    // Build the pipeline for this file.
1105    OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
1106    for (SmallVectorImpl<phases::ID>::iterator
1107           i = PL.begin(), e = PL.end(); i != e; ++i) {
1108      phases::ID Phase = *i;
1109
1110      // We are done if this step is past what the user requested.
1111      if (Phase > FinalPhase)
1112        break;
1113
1114      // Queue linker inputs.
1115      if (Phase == phases::Link) {
1116        assert((i + 1) == e && "linking must be final compilation step.");
1117        LinkerInputs.push_back(Current.take());
1118        break;
1119      }
1120
1121      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
1122      // encode this in the steps because the intermediate type depends on
1123      // arguments. Just special case here.
1124      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
1125        continue;
1126
1127      // Otherwise construct the appropriate action.
1128      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
1129      if (Current->getType() == types::TY_Nothing)
1130        break;
1131    }
1132
1133    // If we ended with something, add to the output list.
1134    if (Current)
1135      Actions.push_back(Current.take());
1136  }
1137
1138  // Add a link action if necessary.
1139  if (!LinkerInputs.empty())
1140    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
1141
1142  // If we are linking, claim any options which are obviously only used for
1143  // compilation.
1144  if (FinalPhase == phases::Link && PL.size() == 1)
1145    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
1146}
1147
1148Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
1149                                     Action *Input) const {
1150  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
1151  // Build the appropriate action.
1152  switch (Phase) {
1153  case phases::Link: llvm_unreachable("link action invalid here.");
1154  case phases::Preprocess: {
1155    types::ID OutputTy;
1156    // -{M, MM} alter the output type.
1157    if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
1158      OutputTy = types::TY_Dependencies;
1159    } else {
1160      OutputTy = Input->getType();
1161      if (!Args.hasFlag(options::OPT_frewrite_includes,
1162                        options::OPT_fno_rewrite_includes, false))
1163        OutputTy = types::getPreprocessedType(OutputTy);
1164      assert(OutputTy != types::TY_INVALID &&
1165             "Cannot preprocess this input type!");
1166    }
1167    return new PreprocessJobAction(Input, OutputTy);
1168  }
1169  case phases::Precompile: {
1170    types::ID OutputTy = types::TY_PCH;
1171    if (Args.hasArg(options::OPT_fsyntax_only)) {
1172      // Syntax checks should not emit a PCH file
1173      OutputTy = types::TY_Nothing;
1174    }
1175    return new PrecompileJobAction(Input, OutputTy);
1176  }
1177  case phases::Compile: {
1178    if (Args.hasArg(options::OPT_fsyntax_only)) {
1179      return new CompileJobAction(Input, types::TY_Nothing);
1180    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
1181      return new CompileJobAction(Input, types::TY_RewrittenObjC);
1182    } else if (Args.hasArg(options::OPT_rewrite_legacy_objc)) {
1183      return new CompileJobAction(Input, types::TY_RewrittenLegacyObjC);
1184    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
1185      return new AnalyzeJobAction(Input, types::TY_Plist);
1186    } else if (Args.hasArg(options::OPT__migrate)) {
1187      return new MigrateJobAction(Input, types::TY_Remap);
1188    } else if (Args.hasArg(options::OPT_emit_ast)) {
1189      return new CompileJobAction(Input, types::TY_AST);
1190    } else if (Args.hasArg(options::OPT_module_file_info)) {
1191      return new CompileJobAction(Input, types::TY_ModuleFile);
1192    } else if (IsUsingLTO(Args)) {
1193      types::ID Output =
1194        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
1195      return new CompileJobAction(Input, Output);
1196    } else {
1197      return new CompileJobAction(Input, types::TY_PP_Asm);
1198    }
1199  }
1200  case phases::Assemble:
1201    return new AssembleJobAction(Input, types::TY_Object);
1202  }
1203
1204  llvm_unreachable("invalid phase in ConstructPhaseAction");
1205}
1206
1207bool Driver::IsUsingLTO(const ArgList &Args) const {
1208  // Check for -emit-llvm or -flto.
1209  if (Args.hasArg(options::OPT_emit_llvm) ||
1210      Args.hasFlag(options::OPT_flto, options::OPT_fno_lto, false))
1211    return true;
1212
1213  // Check for -O4.
1214  if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
1215      return A->getOption().matches(options::OPT_O4);
1216
1217  return false;
1218}
1219
1220void Driver::BuildJobs(Compilation &C) const {
1221  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1222
1223  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
1224
1225  // It is an error to provide a -o option if we are making multiple output
1226  // files.
1227  if (FinalOutput) {
1228    unsigned NumOutputs = 0;
1229    for (ActionList::const_iterator it = C.getActions().begin(),
1230           ie = C.getActions().end(); it != ie; ++it)
1231      if ((*it)->getType() != types::TY_Nothing)
1232        ++NumOutputs;
1233
1234    if (NumOutputs > 1) {
1235      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
1236      FinalOutput = 0;
1237    }
1238  }
1239
1240  // Collect the list of architectures.
1241  llvm::StringSet<> ArchNames;
1242  if (C.getDefaultToolChain().getTriple().isOSDarwin()) {
1243    for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1244         it != ie; ++it) {
1245      Arg *A = *it;
1246      if (A->getOption().matches(options::OPT_arch))
1247        ArchNames.insert(A->getValue());
1248    }
1249  }
1250
1251  for (ActionList::const_iterator it = C.getActions().begin(),
1252         ie = C.getActions().end(); it != ie; ++it) {
1253    Action *A = *it;
1254
1255    // If we are linking an image for multiple archs then the linker wants
1256    // -arch_multiple and -final_output <final image name>. Unfortunately, this
1257    // doesn't fit in cleanly because we have to pass this information down.
1258    //
1259    // FIXME: This is a hack; find a cleaner way to integrate this into the
1260    // process.
1261    const char *LinkingOutput = 0;
1262    if (isa<LipoJobAction>(A)) {
1263      if (FinalOutput)
1264        LinkingOutput = FinalOutput->getValue();
1265      else
1266        LinkingOutput = DefaultImageName.c_str();
1267    }
1268
1269    InputInfo II;
1270    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
1271                       /*BoundArch*/0,
1272                       /*AtTopLevel*/ true,
1273                       /*MultipleArchs*/ ArchNames.size() > 1,
1274                       /*LinkingOutput*/ LinkingOutput,
1275                       II);
1276  }
1277
1278  // If the user passed -Qunused-arguments or there were errors, don't warn
1279  // about any unused arguments.
1280  if (Diags.hasErrorOccurred() ||
1281      C.getArgs().hasArg(options::OPT_Qunused_arguments))
1282    return;
1283
1284  // Claim -### here.
1285  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
1286
1287  // Claim --driver-mode, it was handled earlier.
1288  (void) C.getArgs().hasArg(options::OPT_driver_mode);
1289
1290  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1291       it != ie; ++it) {
1292    Arg *A = *it;
1293
1294    // FIXME: It would be nice to be able to send the argument to the
1295    // DiagnosticsEngine, so that extra values, position, and so on could be
1296    // printed.
1297    if (!A->isClaimed()) {
1298      if (A->getOption().hasFlag(options::NoArgumentUnused))
1299        continue;
1300
1301      // Suppress the warning automatically if this is just a flag, and it is an
1302      // instance of an argument we already claimed.
1303      const Option &Opt = A->getOption();
1304      if (Opt.getKind() == Option::FlagClass) {
1305        bool DuplicateClaimed = false;
1306
1307        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
1308               ie = C.getArgs().filtered_end(); it != ie; ++it) {
1309          if ((*it)->isClaimed()) {
1310            DuplicateClaimed = true;
1311            break;
1312          }
1313        }
1314
1315        if (DuplicateClaimed)
1316          continue;
1317      }
1318
1319      Diag(clang::diag::warn_drv_unused_argument)
1320        << A->getAsString(C.getArgs());
1321    }
1322  }
1323}
1324
1325static const Tool *SelectToolForJob(Compilation &C, const ToolChain *TC,
1326                                    const JobAction *JA,
1327                                    const ActionList *&Inputs) {
1328  const Tool *ToolForJob = 0;
1329
1330  // See if we should look for a compiler with an integrated assembler. We match
1331  // bottom up, so what we are actually looking for is an assembler job with a
1332  // compiler input.
1333
1334  if (TC->useIntegratedAs() &&
1335      !C.getArgs().hasArg(options::OPT_save_temps) &&
1336      isa<AssembleJobAction>(JA) &&
1337      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1338    const Tool *Compiler =
1339      TC->SelectTool(cast<JobAction>(**Inputs->begin()));
1340    if (!Compiler)
1341      return NULL;
1342    if (Compiler->hasIntegratedAssembler()) {
1343      Inputs = &(*Inputs)[0]->getInputs();
1344      ToolForJob = Compiler;
1345    }
1346  }
1347
1348  // Otherwise use the tool for the current job.
1349  if (!ToolForJob)
1350    ToolForJob = TC->SelectTool(*JA);
1351
1352  // See if we should use an integrated preprocessor. We do so when we have
1353  // exactly one input, since this is the only use case we care about
1354  // (irrelevant since we don't support combine yet).
1355  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1356      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1357      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1358      !C.getArgs().hasArg(options::OPT_save_temps) &&
1359      !C.getArgs().hasArg(options::OPT_rewrite_objc) &&
1360      ToolForJob->hasIntegratedCPP())
1361    Inputs = &(*Inputs)[0]->getInputs();
1362
1363  return ToolForJob;
1364}
1365
1366void Driver::BuildJobsForAction(Compilation &C,
1367                                const Action *A,
1368                                const ToolChain *TC,
1369                                const char *BoundArch,
1370                                bool AtTopLevel,
1371                                bool MultipleArchs,
1372                                const char *LinkingOutput,
1373                                InputInfo &Result) const {
1374  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1375
1376  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1377    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1378    // just using Args was better?
1379    const Arg &Input = IA->getInputArg();
1380    Input.claim();
1381    if (Input.getOption().matches(options::OPT_INPUT)) {
1382      const char *Name = Input.getValue();
1383      Result = InputInfo(Name, A->getType(), Name);
1384    } else
1385      Result = InputInfo(&Input, A->getType(), "");
1386    return;
1387  }
1388
1389  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1390    const ToolChain *TC;
1391    const char *ArchName = BAA->getArchName();
1392
1393    if (ArchName)
1394      TC = &getToolChain(C.getArgs(), ArchName);
1395    else
1396      TC = &C.getDefaultToolChain();
1397
1398    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1399                       AtTopLevel, MultipleArchs, LinkingOutput, Result);
1400    return;
1401  }
1402
1403  const ActionList *Inputs = &A->getInputs();
1404
1405  const JobAction *JA = cast<JobAction>(A);
1406  const Tool *T = SelectToolForJob(C, TC, JA, Inputs);
1407  if (!T)
1408    return;
1409
1410  // Only use pipes when there is exactly one input.
1411  InputInfoList InputInfos;
1412  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1413       it != ie; ++it) {
1414    // Treat dsymutil and verify sub-jobs as being at the top-level too, they
1415    // shouldn't get temporary output names.
1416    // FIXME: Clean this up.
1417    bool SubJobAtTopLevel = false;
1418    if (AtTopLevel && (isa<DsymutilJobAction>(A) || isa<VerifyJobAction>(A)))
1419      SubJobAtTopLevel = true;
1420
1421    InputInfo II;
1422    BuildJobsForAction(C, *it, TC, BoundArch, SubJobAtTopLevel, MultipleArchs,
1423                       LinkingOutput, II);
1424    InputInfos.push_back(II);
1425  }
1426
1427  // Always use the first input as the base input.
1428  const char *BaseInput = InputInfos[0].getBaseInput();
1429
1430  // ... except dsymutil actions, which use their actual input as the base
1431  // input.
1432  if (JA->getType() == types::TY_dSYM)
1433    BaseInput = InputInfos[0].getFilename();
1434
1435  // Determine the place to write output to, if any.
1436  if (JA->getType() == types::TY_Nothing)
1437    Result = InputInfo(A->getType(), BaseInput);
1438  else
1439    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, BoundArch,
1440                                          AtTopLevel, MultipleArchs),
1441                       A->getType(), BaseInput);
1442
1443  if (CCCPrintBindings && !CCGenDiagnostics) {
1444    llvm::errs() << "# \"" << T->getToolChain().getTripleString() << '"'
1445                 << " - \"" << T->getName() << "\", inputs: [";
1446    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1447      llvm::errs() << InputInfos[i].getAsString();
1448      if (i + 1 != e)
1449        llvm::errs() << ", ";
1450    }
1451    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1452  } else {
1453    T->ConstructJob(C, *JA, Result, InputInfos,
1454                    C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1455  }
1456}
1457
1458const char *Driver::GetNamedOutputPath(Compilation &C,
1459                                       const JobAction &JA,
1460                                       const char *BaseInput,
1461                                       const char *BoundArch,
1462                                       bool AtTopLevel,
1463                                       bool MultipleArchs) const {
1464  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1465  // Output to a user requested destination?
1466  if (AtTopLevel && !isa<DsymutilJobAction>(JA) &&
1467      !isa<VerifyJobAction>(JA)) {
1468    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1469      return C.addResultFile(FinalOutput->getValue(), &JA);
1470  }
1471
1472  // Default to writing to stdout?
1473  if (AtTopLevel && !CCGenDiagnostics &&
1474      (isa<PreprocessJobAction>(JA) || JA.getType() == types::TY_ModuleFile))
1475    return "-";
1476
1477  // Output to a temporary file?
1478  if ((!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) ||
1479      CCGenDiagnostics) {
1480    StringRef Name = llvm::sys::path::filename(BaseInput);
1481    std::pair<StringRef, StringRef> Split = Name.split('.');
1482    std::string TmpName =
1483      GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1484    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1485  }
1486
1487  SmallString<128> BasePath(BaseInput);
1488  StringRef BaseName;
1489
1490  // Dsymutil actions should use the full path.
1491  if (isa<DsymutilJobAction>(JA) || isa<VerifyJobAction>(JA))
1492    BaseName = BasePath;
1493  else
1494    BaseName = llvm::sys::path::filename(BasePath);
1495
1496  // Determine what the derived output name should be.
1497  const char *NamedOutput;
1498  if (JA.getType() == types::TY_Image) {
1499    if (MultipleArchs && BoundArch) {
1500      SmallString<128> Output(DefaultImageName.c_str());
1501      Output += "-";
1502      Output.append(BoundArch);
1503      NamedOutput = C.getArgs().MakeArgString(Output.c_str());
1504    } else
1505      NamedOutput = DefaultImageName.c_str();
1506  } else {
1507    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1508    assert(Suffix && "All types used for output should have a suffix.");
1509
1510    std::string::size_type End = std::string::npos;
1511    if (!types::appendSuffixForType(JA.getType()))
1512      End = BaseName.rfind('.');
1513    SmallString<128> Suffixed(BaseName.substr(0, End));
1514    if (MultipleArchs && BoundArch) {
1515      Suffixed += "-";
1516      Suffixed.append(BoundArch);
1517    }
1518    Suffixed += '.';
1519    Suffixed += Suffix;
1520    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1521  }
1522
1523  // If we're saving temps and the temp file conflicts with the input file,
1524  // then avoid overwriting input file.
1525  if (!AtTopLevel && C.getArgs().hasArg(options::OPT_save_temps) &&
1526      NamedOutput == BaseName) {
1527
1528    bool SameFile = false;
1529    SmallString<256> Result;
1530    llvm::sys::fs::current_path(Result);
1531    llvm::sys::path::append(Result, BaseName);
1532    llvm::sys::fs::equivalent(BaseInput, Result.c_str(), SameFile);
1533    // Must share the same path to conflict.
1534    if (SameFile) {
1535      StringRef Name = llvm::sys::path::filename(BaseInput);
1536      std::pair<StringRef, StringRef> Split = Name.split('.');
1537      std::string TmpName =
1538        GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1539      return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1540    }
1541  }
1542
1543  // As an annoying special case, PCH generation doesn't strip the pathname.
1544  if (JA.getType() == types::TY_PCH) {
1545    llvm::sys::path::remove_filename(BasePath);
1546    if (BasePath.empty())
1547      BasePath = NamedOutput;
1548    else
1549      llvm::sys::path::append(BasePath, NamedOutput);
1550    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()), &JA);
1551  } else {
1552    return C.addResultFile(NamedOutput, &JA);
1553  }
1554}
1555
1556std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1557  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1558  // attempting to use this prefix when looking for file paths.
1559  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1560       ie = PrefixDirs.end(); it != ie; ++it) {
1561    std::string Dir(*it);
1562    if (Dir.empty())
1563      continue;
1564    if (Dir[0] == '=')
1565      Dir = SysRoot + Dir.substr(1);
1566    SmallString<128> P(Dir);
1567    llvm::sys::path::append(P, Name);
1568    if (llvm::sys::fs::exists(Twine(P)))
1569      return P.str();
1570  }
1571
1572  SmallString<128> P(ResourceDir);
1573  llvm::sys::path::append(P, Name);
1574  if (llvm::sys::fs::exists(Twine(P)))
1575    return P.str();
1576
1577  const ToolChain::path_list &List = TC.getFilePaths();
1578  for (ToolChain::path_list::const_iterator
1579         it = List.begin(), ie = List.end(); it != ie; ++it) {
1580    std::string Dir(*it);
1581    if (Dir.empty())
1582      continue;
1583    if (Dir[0] == '=')
1584      Dir = SysRoot + Dir.substr(1);
1585    SmallString<128> P(Dir);
1586    llvm::sys::path::append(P, Name);
1587    if (llvm::sys::fs::exists(Twine(P)))
1588      return P.str();
1589  }
1590
1591  return Name;
1592}
1593
1594std::string Driver::GetProgramPath(const char *Name,
1595                                   const ToolChain &TC) const {
1596  // FIXME: Needs a better variable than DefaultTargetTriple
1597  std::string TargetSpecificExecutable(DefaultTargetTriple + "-" + Name);
1598  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1599  // attempting to use this prefix when looking for program paths.
1600  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1601       ie = PrefixDirs.end(); it != ie; ++it) {
1602    if (llvm::sys::fs::is_directory(*it)) {
1603      SmallString<128> P(*it);
1604      llvm::sys::path::append(P, TargetSpecificExecutable);
1605      if (llvm::sys::fs::can_execute(Twine(P)))
1606        return P.str();
1607      llvm::sys::path::remove_filename(P);
1608      llvm::sys::path::append(P, Name);
1609      if (llvm::sys::fs::can_execute(Twine(P)))
1610        return P.str();
1611    } else {
1612      SmallString<128> P(*it + Name);
1613      if (llvm::sys::fs::can_execute(Twine(P)))
1614        return P.str();
1615    }
1616  }
1617
1618  const ToolChain::path_list &List = TC.getProgramPaths();
1619  for (ToolChain::path_list::const_iterator
1620         it = List.begin(), ie = List.end(); it != ie; ++it) {
1621    SmallString<128> P(*it);
1622    llvm::sys::path::append(P, TargetSpecificExecutable);
1623    if (llvm::sys::fs::can_execute(Twine(P)))
1624      return P.str();
1625    llvm::sys::path::remove_filename(P);
1626    llvm::sys::path::append(P, Name);
1627    if (llvm::sys::fs::can_execute(Twine(P)))
1628      return P.str();
1629  }
1630
1631  // If all else failed, search the path.
1632  std::string P(llvm::sys::FindProgramByName(TargetSpecificExecutable));
1633  if (!P.empty())
1634    return P;
1635
1636  P = llvm::sys::FindProgramByName(Name);
1637  if (!P.empty())
1638    return P;
1639
1640  return Name;
1641}
1642
1643std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
1644  const {
1645  SmallString<128> Path;
1646  llvm::error_code EC =
1647      llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
1648  if (EC) {
1649    Diag(clang::diag::err_unable_to_make_temp) << EC.message();
1650    return "";
1651  }
1652
1653  return Path.str();
1654}
1655
1656/// \brief Compute target triple from args.
1657///
1658/// This routine provides the logic to compute a target triple from various
1659/// args passed to the driver and the default triple string.
1660static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
1661                                        const ArgList &Args,
1662                                        StringRef DarwinArchName) {
1663  // FIXME: Already done in Compilation *Driver::BuildCompilation
1664  if (const Arg *A = Args.getLastArg(options::OPT_target))
1665    DefaultTargetTriple = A->getValue();
1666
1667  llvm::Triple Target(llvm::Triple::normalize(DefaultTargetTriple));
1668
1669  // Handle Darwin-specific options available here.
1670  if (Target.isOSDarwin()) {
1671    // If an explict Darwin arch name is given, that trumps all.
1672    if (!DarwinArchName.empty()) {
1673      Target.setArch(
1674        tools::darwin::getArchTypeForDarwinArchName(DarwinArchName));
1675      return Target;
1676    }
1677
1678    // Handle the Darwin '-arch' flag.
1679    if (Arg *A = Args.getLastArg(options::OPT_arch)) {
1680      llvm::Triple::ArchType DarwinArch
1681        = tools::darwin::getArchTypeForDarwinArchName(A->getValue());
1682      if (DarwinArch != llvm::Triple::UnknownArch)
1683        Target.setArch(DarwinArch);
1684    }
1685  }
1686
1687  // Handle pseudo-target flags '-EL' and '-EB'.
1688  if (Arg *A = Args.getLastArg(options::OPT_EL, options::OPT_EB)) {
1689    if (A->getOption().matches(options::OPT_EL)) {
1690      if (Target.getArch() == llvm::Triple::mips)
1691        Target.setArch(llvm::Triple::mipsel);
1692      else if (Target.getArch() == llvm::Triple::mips64)
1693        Target.setArch(llvm::Triple::mips64el);
1694    } else {
1695      if (Target.getArch() == llvm::Triple::mipsel)
1696        Target.setArch(llvm::Triple::mips);
1697      else if (Target.getArch() == llvm::Triple::mips64el)
1698        Target.setArch(llvm::Triple::mips64);
1699    }
1700  }
1701
1702  // Skip further flag support on OSes which don't support '-m32' or '-m64'.
1703  if (Target.getArchName() == "tce" ||
1704      Target.getOS() == llvm::Triple::AuroraUX ||
1705      Target.getOS() == llvm::Triple::Minix)
1706    return Target;
1707
1708  // Handle pseudo-target flags '-m32' and '-m64'.
1709  // FIXME: Should this information be in llvm::Triple?
1710  if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
1711    if (A->getOption().matches(options::OPT_m32)) {
1712      if (Target.getArch() == llvm::Triple::x86_64)
1713        Target.setArch(llvm::Triple::x86);
1714      if (Target.getArch() == llvm::Triple::ppc64)
1715        Target.setArch(llvm::Triple::ppc);
1716    } else {
1717      if (Target.getArch() == llvm::Triple::x86)
1718        Target.setArch(llvm::Triple::x86_64);
1719      if (Target.getArch() == llvm::Triple::ppc)
1720        Target.setArch(llvm::Triple::ppc64);
1721    }
1722  }
1723
1724  return Target;
1725}
1726
1727const ToolChain &Driver::getToolChain(const ArgList &Args,
1728                                      StringRef DarwinArchName) const {
1729  llvm::Triple Target = computeTargetTriple(DefaultTargetTriple, Args,
1730                                            DarwinArchName);
1731
1732  ToolChain *&TC = ToolChains[Target.str()];
1733  if (!TC) {
1734    switch (Target.getOS()) {
1735    case llvm::Triple::AuroraUX:
1736      TC = new toolchains::AuroraUX(*this, Target, Args);
1737      break;
1738    case llvm::Triple::Darwin:
1739    case llvm::Triple::MacOSX:
1740    case llvm::Triple::IOS:
1741      if (Target.getArch() == llvm::Triple::x86 ||
1742          Target.getArch() == llvm::Triple::x86_64 ||
1743          Target.getArch() == llvm::Triple::arm ||
1744          Target.getArch() == llvm::Triple::thumb)
1745        TC = new toolchains::DarwinClang(*this, Target, Args);
1746      else
1747        TC = new toolchains::Darwin_Generic_GCC(*this, Target, Args);
1748      break;
1749    case llvm::Triple::DragonFly:
1750      TC = new toolchains::DragonFly(*this, Target, Args);
1751      break;
1752    case llvm::Triple::OpenBSD:
1753      TC = new toolchains::OpenBSD(*this, Target, Args);
1754      break;
1755    case llvm::Triple::Bitrig:
1756      TC = new toolchains::Bitrig(*this, Target, Args);
1757      break;
1758    case llvm::Triple::NetBSD:
1759      TC = new toolchains::NetBSD(*this, Target, Args);
1760      break;
1761    case llvm::Triple::FreeBSD:
1762      TC = new toolchains::FreeBSD(*this, Target, Args);
1763      break;
1764    case llvm::Triple::Minix:
1765      TC = new toolchains::Minix(*this, Target, Args);
1766      break;
1767    case llvm::Triple::Linux:
1768      if (Target.getArch() == llvm::Triple::hexagon)
1769        TC = new toolchains::Hexagon_TC(*this, Target, Args);
1770      else
1771        TC = new toolchains::Linux(*this, Target, Args);
1772      break;
1773    case llvm::Triple::Solaris:
1774      TC = new toolchains::Solaris(*this, Target, Args);
1775      break;
1776    case llvm::Triple::Win32:
1777      TC = new toolchains::Windows(*this, Target, Args);
1778      break;
1779    case llvm::Triple::MinGW32:
1780      // FIXME: We need a MinGW toolchain. Fallthrough for now.
1781    default:
1782      // TCE is an OSless target
1783      if (Target.getArchName() == "tce") {
1784        TC = new toolchains::TCEToolChain(*this, Target, Args);
1785        break;
1786      }
1787      // If Hexagon is configured as an OSless target
1788      if (Target.getArch() == llvm::Triple::hexagon) {
1789        TC = new toolchains::Hexagon_TC(*this, Target, Args);
1790        break;
1791      }
1792      TC = new toolchains::Generic_GCC(*this, Target, Args);
1793      break;
1794    }
1795  }
1796  return *TC;
1797}
1798
1799bool Driver::ShouldUseClangCompiler(const JobAction &JA) const {
1800  // Check if user requested no clang, or clang doesn't understand this type (we
1801  // only handle single inputs for now).
1802  if (JA.size() != 1 ||
1803      !types::isAcceptedByClang((*JA.begin())->getType()))
1804    return false;
1805
1806  // Otherwise make sure this is an action clang understands.
1807  if (!isa<PreprocessJobAction>(JA) && !isa<PrecompileJobAction>(JA) &&
1808      !isa<CompileJobAction>(JA))
1809    return false;
1810
1811  return true;
1812}
1813
1814/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1815/// grouped values as integers. Numbers which are not provided are set to 0.
1816///
1817/// \return True if the entire string was parsed (9.2), or all groups were
1818/// parsed (10.3.5extrastuff).
1819bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1820                               unsigned &Minor, unsigned &Micro,
1821                               bool &HadExtra) {
1822  HadExtra = false;
1823
1824  Major = Minor = Micro = 0;
1825  if (*Str == '\0')
1826    return true;
1827
1828  char *End;
1829  Major = (unsigned) strtol(Str, &End, 10);
1830  if (*Str != '\0' && *End == '\0')
1831    return true;
1832  if (*End != '.')
1833    return false;
1834
1835  Str = End+1;
1836  Minor = (unsigned) strtol(Str, &End, 10);
1837  if (*Str != '\0' && *End == '\0')
1838    return true;
1839  if (*End != '.')
1840    return false;
1841
1842  Str = End+1;
1843  Micro = (unsigned) strtol(Str, &End, 10);
1844  if (*Str != '\0' && *End == '\0')
1845    return true;
1846  if (Str == End)
1847    return false;
1848  HadExtra = true;
1849  return true;
1850}
1851