Driver.cpp revision 243830 
1//===--- Driver.cpp - Clang GCC Compatible Driver -------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "clang/Driver/Driver.h"
11
12#include "clang/Driver/Action.h"
13#include "clang/Driver/Arg.h"
14#include "clang/Driver/ArgList.h"
15#include "clang/Driver/Compilation.h"
16#include "clang/Driver/DriverDiagnostic.h"
17#include "clang/Driver/Job.h"
18#include "clang/Driver/OptTable.h"
19#include "clang/Driver/Option.h"
20#include "clang/Driver/Options.h"
21#include "clang/Driver/Tool.h"
22#include "clang/Driver/ToolChain.h"
23
24#include "clang/Basic/Version.h"
25
26#include "llvm/ADT/ArrayRef.h"
27#include "llvm/ADT/StringSet.h"
28#include "llvm/ADT/OwningPtr.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/PrettyStackTrace.h"
31#include "llvm/Support/raw_ostream.h"
32#include "llvm/Support/FileSystem.h"
33#include "llvm/Support/Path.h"
34#include "llvm/Support/Program.h"
35
36#include "InputInfo.h"
37#include "ToolChains.h"
38
39#include <map>
40
41#include "clang/Config/config.h"
42
43using namespace clang::driver;
44using namespace clang;
45
46Driver::Driver(StringRef ClangExecutable,
47               StringRef DefaultTargetTriple,
48               StringRef DefaultImageName,
49               bool IsProduction,
50               DiagnosticsEngine &Diags)
51  : Opts(createDriverOptTable()), Diags(Diags),
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), CCCIsCXX(false),
58    CCCIsCPP(false),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
85InputArgList *Driver::ParseArgStrings(ArrayRef<const char *> ArgList) {
86  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
87  unsigned MissingArgIndex, MissingArgCount;
88  InputArgList *Args = getOpts().ParseArgs(ArgList.begin(), ArgList.end(),
89                                           MissingArgIndex, MissingArgCount);
90
91  // Check for missing argument error.
92  if (MissingArgCount)
93    Diag(clang::diag::err_drv_missing_argument)
94      << Args->getArgString(MissingArgIndex) << MissingArgCount;
95
96  // Check for unsupported options.
97  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
98       it != ie; ++it) {
99    Arg *A = *it;
100    if (A->getOption().hasFlag(options::Unsupported)) {
101      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
102      continue;
103    }
104
105    // Warn about -mcpu= without an argument.
106    if (A->getOption().matches(options::OPT_mcpu_EQ) &&
107        A->containsValue("")) {
108      Diag(clang::diag::warn_drv_empty_joined_argument) <<
109        A->getAsString(*Args);
110    }
111  }
112
113  return Args;
114}
115
116// Determine which compilation mode we are in. We look for options which
117// affect the phase, starting with the earliest phases, and record which
118// option we used to determine the final phase.
119phases::ID Driver::getFinalPhase(const DerivedArgList &DAL, Arg **FinalPhaseArg)
120const {
121  Arg *PhaseArg = 0;
122  phases::ID FinalPhase;
123
124  // -{E,M,MM} only run the preprocessor.
125  if (CCCIsCPP ||
126      (PhaseArg = DAL.getLastArg(options::OPT_E)) ||
127      (PhaseArg = DAL.getLastArg(options::OPT_M, options::OPT_MM))) {
128    FinalPhase = phases::Preprocess;
129
130    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
131  } else if ((PhaseArg = DAL.getLastArg(options::OPT_fsyntax_only)) ||
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 = CompilerPath.split(':');
246      PrefixDirs.push_back(Split.first);
247      CompilerPath = Split.second;
248    }
249  }
250
251  // FIXME: What are we going to do with -V and -b?
252
253  // FIXME: This stuff needs to go into the Compilation, not the driver.
254  bool CCCPrintOptions = false, CCCPrintActions = false;
255
256  InputArgList *Args = ParseArgStrings(ArgList.slice(1));
257
258  // -no-canonical-prefixes is used very early in main.
259  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
260
261  // Ignore -pipe.
262  Args->ClaimAllArgs(options::OPT_pipe);
263
264  // Extract -ccc args.
265  //
266  // FIXME: We need to figure out where this behavior should live. Most of it
267  // should be outside in the client; the parts that aren't should have proper
268  // options, either by introducing new ones or by overloading gcc ones like -V
269  // or -b.
270  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
271  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
272  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
273  CCCIsCXX = Args->hasArg(options::OPT_ccc_cxx) || CCCIsCXX;
274  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
275  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
276    CCCGenericGCCName = A->getValue();
277  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
278                            options::OPT_ccc_pch_is_pth);
279  // FIXME: DefaultTargetTriple is used by the target-prefixed calls to as/ld
280  // and getToolChain is const.
281  if (const Arg *A = Args->getLastArg(options::OPT_target))
282    DefaultTargetTriple = A->getValue();
283  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
284    Dir = InstalledDir = A->getValue();
285  for (arg_iterator it = Args->filtered_begin(options::OPT_B),
286         ie = Args->filtered_end(); it != ie; ++it) {
287    const Arg *A = *it;
288    A->claim();
289    PrefixDirs.push_back(A->getValue(0));
290  }
291  if (const Arg *A = Args->getLastArg(options::OPT__sysroot_EQ))
292    SysRoot = A->getValue();
293  if (Args->hasArg(options::OPT_nostdlib))
294    UseStdLib = false;
295
296  // Perform the default argument translations.
297  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
298
299  // Owned by the host.
300  const ToolChain &TC = getToolChain(*Args);
301
302  // The compilation takes ownership of Args.
303  Compilation *C = new Compilation(*this, TC, Args, TranslatedArgs);
304
305  // FIXME: This behavior shouldn't be here.
306  if (CCCPrintOptions) {
307    PrintOptions(C->getInputArgs());
308    return C;
309  }
310
311  if (!HandleImmediateArgs(*C))
312    return C;
313
314  // Construct the list of inputs.
315  InputList Inputs;
316  BuildInputs(C->getDefaultToolChain(), C->getArgs(), Inputs);
317
318  // Construct the list of abstract actions to perform for this compilation. On
319  // Darwin target OSes this uses the driver-driver and universal actions.
320  if (TC.getTriple().isOSDarwin())
321    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
322                          Inputs, C->getActions());
323  else
324    BuildActions(C->getDefaultToolChain(), C->getArgs(), Inputs,
325                 C->getActions());
326
327  if (CCCPrintActions) {
328    PrintActions(*C);
329    return C;
330  }
331
332  BuildJobs(*C);
333
334  return C;
335}
336
337// When clang crashes, produce diagnostic information including the fully
338// preprocessed source file(s).  Request that the developer attach the
339// diagnostic information to a bug report.
340void Driver::generateCompilationDiagnostics(Compilation &C,
341                                            const Command *FailingCommand) {
342  if (C.getArgs().hasArg(options::OPT_fno_crash_diagnostics))
343    return;
344
345  // Don't try to generate diagnostics for link jobs.
346  if (FailingCommand && FailingCommand->getCreator().isLinkJob())
347    return;
348
349  // Print the version of the compiler.
350  PrintVersion(C, llvm::errs());
351
352  Diag(clang::diag::note_drv_command_failed_diag_msg)
353    << "PLEASE submit a bug report to " BUG_REPORT_URL " and include the "
354    "crash backtrace, preprocessed source, and associated run script.";
355
356  // Suppress driver output and emit preprocessor output to temp file.
357  CCCIsCPP = true;
358  CCGenDiagnostics = true;
359  C.getArgs().AddFlagArg(0, Opts->getOption(options::OPT_frewrite_includes));
360
361  // Save the original job command(s).
362  std::string Cmd;
363  llvm::raw_string_ostream OS(Cmd);
364  if (FailingCommand)
365    C.PrintDiagnosticJob(OS, *FailingCommand);
366  else
367    // Crash triggered by FORCE_CLANG_DIAGNOSTICS_CRASH, which doesn't have an
368    // associated FailingCommand, so just pass all jobs.
369    C.PrintDiagnosticJob(OS, C.getJobs());
370  OS.flush();
371
372  // Clear stale state and suppress tool output.
373  C.initCompilationForDiagnostics();
374  Diags.Reset();
375
376  // Construct the list of inputs.
377  InputList Inputs;
378  BuildInputs(C.getDefaultToolChain(), C.getArgs(), Inputs);
379
380  for (InputList::iterator it = Inputs.begin(), ie = Inputs.end(); it != ie;) {
381    bool IgnoreInput = false;
382
383    // Ignore input from stdin or any inputs that cannot be preprocessed.
384    if (!strcmp(it->second->getValue(), "-")) {
385      Diag(clang::diag::note_drv_command_failed_diag_msg)
386        << "Error generating preprocessed source(s) - ignoring input from stdin"
387        ".";
388      IgnoreInput = true;
389    } else if (types::getPreprocessedType(it->first) == types::TY_INVALID) {
390      IgnoreInput = true;
391    }
392
393    if (IgnoreInput) {
394      it = Inputs.erase(it);
395      ie = Inputs.end();
396    } else {
397      ++it;
398    }
399  }
400
401  // Don't attempt to generate preprocessed files if multiple -arch options are
402  // used, unless they're all duplicates.
403  llvm::StringSet<> ArchNames;
404  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
405       it != ie; ++it) {
406    Arg *A = *it;
407    if (A->getOption().matches(options::OPT_arch)) {
408      StringRef ArchName = A->getValue();
409      ArchNames.insert(ArchName);
410    }
411  }
412  if (ArchNames.size() > 1) {
413    Diag(clang::diag::note_drv_command_failed_diag_msg)
414      << "Error generating preprocessed source(s) - cannot generate "
415      "preprocessed source with multiple -arch options.";
416    return;
417  }
418
419  if (Inputs.empty()) {
420    Diag(clang::diag::note_drv_command_failed_diag_msg)
421      << "Error generating preprocessed source(s) - no preprocessable inputs.";
422    return;
423  }
424
425  // Construct the list of abstract actions to perform for this compilation. On
426  // Darwin OSes this uses the driver-driver and builds universal actions.
427  const ToolChain &TC = C.getDefaultToolChain();
428  if (TC.getTriple().isOSDarwin())
429    BuildUniversalActions(TC, C.getArgs(), Inputs, C.getActions());
430  else
431    BuildActions(TC, C.getArgs(), Inputs, C.getActions());
432
433  BuildJobs(C);
434
435  // If there were errors building the compilation, quit now.
436  if (Diags.hasErrorOccurred()) {
437    Diag(clang::diag::note_drv_command_failed_diag_msg)
438      << "Error generating preprocessed source(s).";
439    return;
440  }
441
442  // Generate preprocessed output.
443  FailingCommand = 0;
444  int Res = C.ExecuteJob(C.getJobs(), FailingCommand);
445
446  // If the command succeeded, we are done.
447  if (Res == 0) {
448    Diag(clang::diag::note_drv_command_failed_diag_msg)
449      << "\n********************\n\n"
450      "PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:\n"
451      "Preprocessed source(s) and associated run script(s) are located at:";
452    ArgStringList Files = C.getTempFiles();
453    for (ArgStringList::const_iterator it = Files.begin(), ie = Files.end();
454         it != ie; ++it) {
455      Diag(clang::diag::note_drv_command_failed_diag_msg) << *it;
456
457      std::string Err;
458      std::string Script = StringRef(*it).rsplit('.').first;
459      Script += ".sh";
460      llvm::raw_fd_ostream ScriptOS(Script.c_str(), Err,
461                                    llvm::raw_fd_ostream::F_Excl |
462                                    llvm::raw_fd_ostream::F_Binary);
463      if (!Err.empty()) {
464        Diag(clang::diag::note_drv_command_failed_diag_msg)
465          << "Error generating run script: " + Script + " " + Err;
466      } else {
467        // Append the new filename with correct preprocessed suffix.
468        size_t I, E;
469        I = Cmd.find("-main-file-name ");
470        assert (I != std::string::npos && "Expected to find -main-file-name");
471        I += 16;
472        E = Cmd.find(" ", I);
473        assert (E != std::string::npos && "-main-file-name missing argument?");
474        StringRef OldFilename = StringRef(Cmd).slice(I, E);
475        StringRef NewFilename = llvm::sys::path::filename(*it);
476        I = StringRef(Cmd).rfind(OldFilename);
477        E = I + OldFilename.size();
478        I = Cmd.rfind(" ", I) + 1;
479        Cmd.replace(I, E - I, NewFilename.data(), NewFilename.size());
480        ScriptOS << Cmd;
481        Diag(clang::diag::note_drv_command_failed_diag_msg) << Script;
482      }
483    }
484    Diag(clang::diag::note_drv_command_failed_diag_msg)
485      << "\n\n********************";
486  } else {
487    // Failure, remove preprocessed files.
488    if (!C.getArgs().hasArg(options::OPT_save_temps))
489      C.CleanupFileList(C.getTempFiles(), true);
490
491    Diag(clang::diag::note_drv_command_failed_diag_msg)
492      << "Error generating preprocessed source(s).";
493  }
494}
495
496int Driver::ExecuteCompilation(const Compilation &C,
497                               const Command *&FailingCommand) const {
498  // Just print if -### was present.
499  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
500    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
501    return 0;
502  }
503
504  // If there were errors building the compilation, quit now.
505  if (Diags.hasErrorOccurred())
506    return 1;
507
508  int Res = C.ExecuteJob(C.getJobs(), FailingCommand);
509
510  // Remove temp files.
511  C.CleanupFileList(C.getTempFiles());
512
513  // If the command succeeded, we are done.
514  if (Res == 0)
515    return Res;
516
517  // Otherwise, remove result files as well.
518  if (!C.getArgs().hasArg(options::OPT_save_temps)) {
519    C.CleanupFileList(C.getResultFiles(), true);
520
521    // Failure result files are valid unless we crashed.
522    if (Res < 0)
523      C.CleanupFileList(C.getFailureResultFiles(), true);
524  }
525
526  // Print extra information about abnormal failures, if possible.
527  //
528  // This is ad-hoc, but we don't want to be excessively noisy. If the result
529  // status was 1, assume the command failed normally. In particular, if it was
530  // the compiler then assume it gave a reasonable error code. Failures in other
531  // tools are less common, and they generally have worse diagnostics, so always
532  // print the diagnostic there.
533  const Tool &FailingTool = FailingCommand->getCreator();
534
535  if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
536    // FIXME: See FIXME above regarding result code interpretation.
537    if (Res < 0)
538      Diag(clang::diag::err_drv_command_signalled)
539        << FailingTool.getShortName();
540    else
541      Diag(clang::diag::err_drv_command_failed)
542        << FailingTool.getShortName() << Res;
543  }
544
545  return Res;
546}
547
548void Driver::PrintOptions(const ArgList &Args) const {
549  unsigned i = 0;
550  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
551       it != ie; ++it, ++i) {
552    Arg *A = *it;
553    llvm::errs() << "Option " << i << " - "
554                 << "Name: \"" << A->getOption().getPrefixedName() << "\", "
555                 << "Values: {";
556    for (unsigned j = 0; j < A->getNumValues(); ++j) {
557      if (j)
558        llvm::errs() << ", ";
559      llvm::errs() << '"' << A->getValue(j) << '"';
560    }
561    llvm::errs() << "}\n";
562  }
563}
564
565void Driver::PrintHelp(bool ShowHidden) const {
566  getOpts().PrintHelp(llvm::outs(), Name.c_str(), DriverTitle.c_str(),
567                      /*Include*/0,
568                      /*Exclude*/options::NoDriverOption |
569                      (ShowHidden ? 0 : options::HelpHidden));
570}
571
572void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
573  // FIXME: The following handlers should use a callback mechanism, we don't
574  // know what the client would like to do.
575  OS << getClangFullVersion() << '\n';
576  const ToolChain &TC = C.getDefaultToolChain();
577  OS << "Target: " << TC.getTripleString() << '\n';
578
579  // Print the threading model.
580  //
581  // FIXME: Implement correctly.
582  OS << "Thread model: " << "posix" << '\n';
583}
584
585/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
586/// option.
587static void PrintDiagnosticCategories(raw_ostream &OS) {
588  // Skip the empty category.
589  for (unsigned i = 1, max = DiagnosticIDs::getNumberOfCategories();
590       i != max; ++i)
591    OS << i << ',' << DiagnosticIDs::getCategoryNameFromID(i) << '\n';
592}
593
594bool Driver::HandleImmediateArgs(const Compilation &C) {
595  // The order these options are handled in gcc is all over the place, but we
596  // don't expect inconsistencies w.r.t. that to matter in practice.
597
598  if (C.getArgs().hasArg(options::OPT_dumpmachine)) {
599    llvm::outs() << C.getDefaultToolChain().getTripleString() << '\n';
600    return false;
601  }
602
603  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
604    // Since -dumpversion is only implemented for pedantic GCC compatibility, we
605    // return an answer which matches our definition of __VERSION__.
606    //
607    // If we want to return a more correct answer some day, then we should
608    // introduce a non-pedantically GCC compatible mode to Clang in which we
609    // provide sensible definitions for -dumpversion, __VERSION__, etc.
610    llvm::outs() << "4.2.1\n";
611    return false;
612  }
613
614  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
615    PrintDiagnosticCategories(llvm::outs());
616    return false;
617  }
618
619  if (C.getArgs().hasArg(options::OPT_help) ||
620      C.getArgs().hasArg(options::OPT__help_hidden)) {
621    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
622    return false;
623  }
624
625  if (C.getArgs().hasArg(options::OPT__version)) {
626    // Follow gcc behavior and use stdout for --version and stderr for -v.
627    PrintVersion(C, llvm::outs());
628    return false;
629  }
630
631  if (C.getArgs().hasArg(options::OPT_v) ||
632      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
633    PrintVersion(C, llvm::errs());
634    SuppressMissingInputWarning = true;
635  }
636
637  const ToolChain &TC = C.getDefaultToolChain();
638  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
639    llvm::outs() << "programs: =";
640    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
641           ie = TC.getProgramPaths().end(); it != ie; ++it) {
642      if (it != TC.getProgramPaths().begin())
643        llvm::outs() << ':';
644      llvm::outs() << *it;
645    }
646    llvm::outs() << "\n";
647    llvm::outs() << "libraries: =" << ResourceDir;
648
649    StringRef sysroot = C.getSysRoot();
650
651    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
652           ie = TC.getFilePaths().end(); it != ie; ++it) {
653      llvm::outs() << ':';
654      const char *path = it->c_str();
655      if (path[0] == '=')
656        llvm::outs() << sysroot << path + 1;
657      else
658        llvm::outs() << path;
659    }
660    llvm::outs() << "\n";
661    return false;
662  }
663
664  // FIXME: The following handlers should use a callback mechanism, we don't
665  // know what the client would like to do.
666  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
667    llvm::outs() << GetFilePath(A->getValue(), TC) << "\n";
668    return false;
669  }
670
671  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
672    llvm::outs() << GetProgramPath(A->getValue(), TC) << "\n";
673    return false;
674  }
675
676  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
677    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
678    return false;
679  }
680
681  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
682    // FIXME: We need tool chain support for this.
683    llvm::outs() << ".;\n";
684
685    switch (C.getDefaultToolChain().getTriple().getArch()) {
686    default:
687      break;
688
689    case llvm::Triple::x86_64:
690      llvm::outs() << "x86_64;@m64" << "\n";
691      break;
692
693    case llvm::Triple::ppc64:
694      llvm::outs() << "ppc64;@m64" << "\n";
695      break;
696    }
697    return false;
698  }
699
700  // FIXME: What is the difference between print-multi-directory and
701  // print-multi-os-directory?
702  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
703      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
704    switch (C.getDefaultToolChain().getTriple().getArch()) {
705    default:
706    case llvm::Triple::x86:
707    case llvm::Triple::ppc:
708      llvm::outs() << "." << "\n";
709      break;
710
711    case llvm::Triple::x86_64:
712      llvm::outs() << "." << "\n";
713      break;
714
715    case llvm::Triple::ppc64:
716      llvm::outs() << "ppc64" << "\n";
717      break;
718    }
719    return false;
720  }
721
722  return true;
723}
724
725static unsigned PrintActions1(const Compilation &C, Action *A,
726                              std::map<Action*, unsigned> &Ids) {
727  if (Ids.count(A))
728    return Ids[A];
729
730  std::string str;
731  llvm::raw_string_ostream os(str);
732
733  os << Action::getClassName(A->getKind()) << ", ";
734  if (InputAction *IA = dyn_cast<InputAction>(A)) {
735    os << "\"" << IA->getInputArg().getValue() << "\"";
736  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
737    os << '"' << BIA->getArchName() << '"'
738       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
739  } else {
740    os << "{";
741    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
742      os << PrintActions1(C, *it, Ids);
743      ++it;
744      if (it != ie)
745        os << ", ";
746    }
747    os << "}";
748  }
749
750  unsigned Id = Ids.size();
751  Ids[A] = Id;
752  llvm::errs() << Id << ": " << os.str() << ", "
753               << types::getTypeName(A->getType()) << "\n";
754
755  return Id;
756}
757
758void Driver::PrintActions(const Compilation &C) const {
759  std::map<Action*, unsigned> Ids;
760  for (ActionList::const_iterator it = C.getActions().begin(),
761         ie = C.getActions().end(); it != ie; ++it)
762    PrintActions1(C, *it, Ids);
763}
764
765/// \brief Check whether the given input tree contains any compilation or
766/// assembly actions.
767static bool ContainsCompileOrAssembleAction(const Action *A) {
768  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
769    return true;
770
771  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
772    if (ContainsCompileOrAssembleAction(*it))
773      return true;
774
775  return false;
776}
777
778void Driver::BuildUniversalActions(const ToolChain &TC,
779                                   const DerivedArgList &Args,
780                                   const InputList &BAInputs,
781                                   ActionList &Actions) const {
782  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
783  // Collect the list of architectures. Duplicates are allowed, but should only
784  // be handled once (in the order seen).
785  llvm::StringSet<> ArchNames;
786  SmallVector<const char *, 4> Archs;
787  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
788       it != ie; ++it) {
789    Arg *A = *it;
790
791    if (A->getOption().matches(options::OPT_arch)) {
792      // Validate the option here; we don't save the type here because its
793      // particular spelling may participate in other driver choices.
794      llvm::Triple::ArchType Arch =
795        tools::darwin::getArchTypeForDarwinArchName(A->getValue());
796      if (Arch == llvm::Triple::UnknownArch) {
797        Diag(clang::diag::err_drv_invalid_arch_name)
798          << A->getAsString(Args);
799        continue;
800      }
801
802      A->claim();
803      if (ArchNames.insert(A->getValue()))
804        Archs.push_back(A->getValue());
805    }
806  }
807
808  // When there is no explicit arch for this platform, make sure we still bind
809  // the architecture (to the default) so that -Xarch_ is handled correctly.
810  if (!Archs.size())
811    Archs.push_back(Args.MakeArgString(TC.getDefaultUniversalArchName()));
812
813  // FIXME: We killed off some others but these aren't yet detected in a
814  // functional manner. If we added information to jobs about which "auxiliary"
815  // files they wrote then we could detect the conflict these cause downstream.
816  if (Archs.size() > 1) {
817    // No recovery needed, the point of this is just to prevent
818    // overwriting the same files.
819    if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
820      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
821        << A->getAsString(Args);
822  }
823
824  ActionList SingleActions;
825  BuildActions(TC, Args, BAInputs, SingleActions);
826
827  // Add in arch bindings for every top level action, as well as lipo and
828  // dsymutil steps if needed.
829  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
830    Action *Act = SingleActions[i];
831
832    // Make sure we can lipo this kind of output. If not (and it is an actual
833    // output) then we disallow, since we can't create an output file with the
834    // right name without overwriting it. We could remove this oddity by just
835    // changing the output names to include the arch, which would also fix
836    // -save-temps. Compatibility wins for now.
837
838    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
839      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
840        << types::getTypeName(Act->getType());
841
842    ActionList Inputs;
843    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
844      Inputs.push_back(new BindArchAction(Act, Archs[i]));
845      if (i != 0)
846        Inputs.back()->setOwnsInputs(false);
847    }
848
849    // Lipo if necessary, we do it this way because we need to set the arch flag
850    // so that -Xarch_ gets overwritten.
851    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
852      Actions.append(Inputs.begin(), Inputs.end());
853    else
854      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
855
856    // Handle debug info queries.
857    Arg *A = Args.getLastArg(options::OPT_g_Group);
858    if (A && !A->getOption().matches(options::OPT_g0) &&
859        !A->getOption().matches(options::OPT_gstabs) &&
860        ContainsCompileOrAssembleAction(Actions.back())) {
861
862      // Add a 'dsymutil' step if necessary, when debug info is enabled and we
863      // have a compile input. We need to run 'dsymutil' ourselves in such cases
864      // because the debug info will refer to a temporary object file which is
865      // will be removed at the end of the compilation process.
866      if (Act->getType() == types::TY_Image) {
867        ActionList Inputs;
868        Inputs.push_back(Actions.back());
869        Actions.pop_back();
870        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
871      }
872
873      // Verify the output (debug information only) if we passed '-verify'.
874      if (Args.hasArg(options::OPT_verify)) {
875        ActionList VerifyInputs;
876        VerifyInputs.push_back(Actions.back());
877        Actions.pop_back();
878        Actions.push_back(new VerifyJobAction(VerifyInputs,
879                                              types::TY_Nothing));
880      }
881    }
882  }
883}
884
885// Construct a the list of inputs and their types.
886void Driver::BuildInputs(const ToolChain &TC, const DerivedArgList &Args,
887                         InputList &Inputs) const {
888  // Track the current user specified (-x) input. We also explicitly track the
889  // argument used to set the type; we only want to claim the type when we
890  // actually use it, so we warn about unused -x arguments.
891  types::ID InputType = types::TY_Nothing;
892  Arg *InputTypeArg = 0;
893
894  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
895       it != ie; ++it) {
896    Arg *A = *it;
897
898    if (A->getOption().getKind() == Option::InputClass) {
899      const char *Value = A->getValue();
900      types::ID Ty = types::TY_INVALID;
901
902      // Infer the input type if necessary.
903      if (InputType == types::TY_Nothing) {
904        // If there was an explicit arg for this, claim it.
905        if (InputTypeArg)
906          InputTypeArg->claim();
907
908        // stdin must be handled specially.
909        if (memcmp(Value, "-", 2) == 0) {
910          // If running with -E, treat as a C input (this changes the builtin
911          // macros, for example). This may be overridden by -ObjC below.
912          //
913          // Otherwise emit an error but still use a valid type to avoid
914          // spurious errors (e.g., no inputs).
915          if (!Args.hasArgNoClaim(options::OPT_E) && !CCCIsCPP)
916            Diag(clang::diag::err_drv_unknown_stdin_type);
917          Ty = types::TY_C;
918        } else {
919          // Otherwise lookup by extension.
920          // Fallback is C if invoked as C preprocessor or Object otherwise.
921          // We use a host hook here because Darwin at least has its own
922          // idea of what .s is.
923          if (const char *Ext = strrchr(Value, '.'))
924            Ty = TC.LookupTypeForExtension(Ext + 1);
925
926          if (Ty == types::TY_INVALID) {
927            if (CCCIsCPP)
928              Ty = types::TY_C;
929            else
930              Ty = types::TY_Object;
931          }
932
933          // If the driver is invoked as C++ compiler (like clang++ or c++) it
934          // should autodetect some input files as C++ for g++ compatibility.
935          if (CCCIsCXX) {
936            types::ID OldTy = Ty;
937            Ty = types::lookupCXXTypeForCType(Ty);
938
939            if (Ty != OldTy)
940              Diag(clang::diag::warn_drv_treating_input_as_cxx)
941                << getTypeName(OldTy) << getTypeName(Ty);
942          }
943        }
944
945        // -ObjC and -ObjC++ override the default language, but only for "source
946        // files". We just treat everything that isn't a linker input as a
947        // source file.
948        //
949        // FIXME: Clean this up if we move the phase sequence into the type.
950        if (Ty != types::TY_Object) {
951          if (Args.hasArg(options::OPT_ObjC))
952            Ty = types::TY_ObjC;
953          else if (Args.hasArg(options::OPT_ObjCXX))
954            Ty = types::TY_ObjCXX;
955        }
956      } else {
957        assert(InputTypeArg && "InputType set w/o InputTypeArg");
958        InputTypeArg->claim();
959        Ty = InputType;
960      }
961
962      // Check that the file exists, if enabled.
963      if (CheckInputsExist && memcmp(Value, "-", 2) != 0) {
964        SmallString<64> Path(Value);
965        if (Arg *WorkDir = Args.getLastArg(options::OPT_working_directory)) {
966          if (!llvm::sys::path::is_absolute(Path.str())) {
967            SmallString<64> Directory(WorkDir->getValue());
968            llvm::sys::path::append(Directory, Value);
969            Path.assign(Directory);
970          }
971        }
972
973        bool exists = false;
974        if (llvm::sys::fs::exists(Path.c_str(), exists) || !exists)
975          Diag(clang::diag::err_drv_no_such_file) << Path.str();
976        else
977          Inputs.push_back(std::make_pair(Ty, A));
978      } else
979        Inputs.push_back(std::make_pair(Ty, A));
980
981    } else if (A->getOption().hasFlag(options::LinkerInput)) {
982      // Just treat as object type, we could make a special type for this if
983      // necessary.
984      Inputs.push_back(std::make_pair(types::TY_Object, A));
985
986    } else if (A->getOption().matches(options::OPT_x)) {
987      InputTypeArg = A;
988      InputType = types::lookupTypeForTypeSpecifier(A->getValue());
989      A->claim();
990
991      // Follow gcc behavior and treat as linker input for invalid -x
992      // options. Its not clear why we shouldn't just revert to unknown; but
993      // this isn't very important, we might as well be bug compatible.
994      if (!InputType) {
995        Diag(clang::diag::err_drv_unknown_language) << A->getValue();
996        InputType = types::TY_Object;
997      }
998    }
999  }
1000  if (CCCIsCPP && Inputs.empty()) {
1001    // If called as standalone preprocessor, stdin is processed
1002    // if no other input is present.
1003    unsigned Index = Args.getBaseArgs().MakeIndex("-");
1004    Arg *A = Opts->ParseOneArg(Args, Index);
1005    A->claim();
1006    Inputs.push_back(std::make_pair(types::TY_C, A));
1007  }
1008}
1009
1010void Driver::BuildActions(const ToolChain &TC, const DerivedArgList &Args,
1011                          const InputList &Inputs, ActionList &Actions) const {
1012  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
1013
1014  if (!SuppressMissingInputWarning && Inputs.empty()) {
1015    Diag(clang::diag::err_drv_no_input_files);
1016    return;
1017  }
1018
1019  Arg *FinalPhaseArg;
1020  phases::ID FinalPhase = getFinalPhase(Args, &FinalPhaseArg);
1021
1022  // Reject -Z* at the top level, these options should never have been exposed
1023  // by gcc.
1024  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
1025    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
1026
1027  // Construct the actions to perform.
1028  ActionList LinkerInputs;
1029  unsigned NumSteps = 0;
1030  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1031    types::ID InputType = Inputs[i].first;
1032    const Arg *InputArg = Inputs[i].second;
1033
1034    NumSteps = types::getNumCompilationPhases(InputType);
1035    assert(NumSteps && "Invalid number of steps!");
1036
1037    // If the first step comes after the final phase we are doing as part of
1038    // this compilation, warn the user about it.
1039    phases::ID InitialPhase = types::getCompilationPhase(InputType, 0);
1040    if (InitialPhase > FinalPhase) {
1041      // Claim here to avoid the more general unused warning.
1042      InputArg->claim();
1043
1044      // Suppress all unused style warnings with -Qunused-arguments
1045      if (Args.hasArg(options::OPT_Qunused_arguments))
1046        continue;
1047
1048      // Special case when final phase determined by binary name, rather than
1049      // by a command-line argument with a corresponding Arg.
1050      if (CCCIsCPP)
1051        Diag(clang::diag::warn_drv_input_file_unused_by_cpp)
1052          << InputArg->getAsString(Args)
1053          << getPhaseName(InitialPhase);
1054      // Special case '-E' warning on a previously preprocessed file to make
1055      // more sense.
1056      else if (InitialPhase == phases::Compile &&
1057               FinalPhase == phases::Preprocess &&
1058               getPreprocessedType(InputType) == types::TY_INVALID)
1059        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
1060          << InputArg->getAsString(Args)
1061          << !!FinalPhaseArg
1062          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1063      else
1064        Diag(clang::diag::warn_drv_input_file_unused)
1065          << InputArg->getAsString(Args)
1066          << getPhaseName(InitialPhase)
1067          << !!FinalPhaseArg
1068          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1069      continue;
1070    }
1071
1072    // Build the pipeline for this file.
1073    OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
1074    for (unsigned i = 0; i != NumSteps; ++i) {
1075      phases::ID Phase = types::getCompilationPhase(InputType, i);
1076
1077      // We are done if this step is past what the user requested.
1078      if (Phase > FinalPhase)
1079        break;
1080
1081      // Queue linker inputs.
1082      if (Phase == phases::Link) {
1083        assert(i + 1 == NumSteps && "linking must be final compilation step.");
1084        LinkerInputs.push_back(Current.take());
1085        break;
1086      }
1087
1088      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
1089      // encode this in the steps because the intermediate type depends on
1090      // arguments. Just special case here.
1091      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
1092        continue;
1093
1094      // Otherwise construct the appropriate action.
1095      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
1096      if (Current->getType() == types::TY_Nothing)
1097        break;
1098    }
1099
1100    // If we ended with something, add to the output list.
1101    if (Current)
1102      Actions.push_back(Current.take());
1103  }
1104
1105  // Add a link action if necessary.
1106  if (!LinkerInputs.empty())
1107    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
1108
1109  // If we are linking, claim any options which are obviously only used for
1110  // compilation.
1111  if (FinalPhase == phases::Link && (NumSteps == 1))
1112    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
1113}
1114
1115Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
1116                                     Action *Input) const {
1117  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
1118  // Build the appropriate action.
1119  switch (Phase) {
1120  case phases::Link: llvm_unreachable("link action invalid here.");
1121  case phases::Preprocess: {
1122    types::ID OutputTy;
1123    // -{M, MM} alter the output type.
1124    if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
1125      OutputTy = types::TY_Dependencies;
1126    } else {
1127      OutputTy = Input->getType();
1128      if (!Args.hasFlag(options::OPT_frewrite_includes,
1129                        options::OPT_fno_rewrite_includes, false))
1130        OutputTy = types::getPreprocessedType(OutputTy);
1131      assert(OutputTy != types::TY_INVALID &&
1132             "Cannot preprocess this input type!");
1133    }
1134    return new PreprocessJobAction(Input, OutputTy);
1135  }
1136  case phases::Precompile: {
1137    types::ID OutputTy = types::TY_PCH;
1138    if (Args.hasArg(options::OPT_fsyntax_only)) {
1139      // Syntax checks should not emit a PCH file
1140      OutputTy = types::TY_Nothing;
1141    }
1142    return new PrecompileJobAction(Input, OutputTy);
1143  }
1144  case phases::Compile: {
1145    if (Args.hasArg(options::OPT_fsyntax_only)) {
1146      return new CompileJobAction(Input, types::TY_Nothing);
1147    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
1148      return new CompileJobAction(Input, types::TY_RewrittenObjC);
1149    } else if (Args.hasArg(options::OPT_rewrite_legacy_objc)) {
1150      return new CompileJobAction(Input, types::TY_RewrittenLegacyObjC);
1151    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
1152      return new AnalyzeJobAction(Input, types::TY_Plist);
1153    } else if (Args.hasArg(options::OPT__migrate)) {
1154      return new MigrateJobAction(Input, types::TY_Remap);
1155    } else if (Args.hasArg(options::OPT_emit_ast)) {
1156      return new CompileJobAction(Input, types::TY_AST);
1157    } else if (IsUsingLTO(Args)) {
1158      types::ID Output =
1159        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
1160      return new CompileJobAction(Input, Output);
1161    } else {
1162      return new CompileJobAction(Input, types::TY_PP_Asm);
1163    }
1164  }
1165  case phases::Assemble:
1166    return new AssembleJobAction(Input, types::TY_Object);
1167  }
1168
1169  llvm_unreachable("invalid phase in ConstructPhaseAction");
1170}
1171
1172bool Driver::IsUsingLTO(const ArgList &Args) const {
1173  // Check for -emit-llvm or -flto.
1174  if (Args.hasArg(options::OPT_emit_llvm) ||
1175      Args.hasFlag(options::OPT_flto, options::OPT_fno_lto, false))
1176    return true;
1177
1178  // Check for -O4.
1179  if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
1180      return A->getOption().matches(options::OPT_O4);
1181
1182  return false;
1183}
1184
1185void Driver::BuildJobs(Compilation &C) const {
1186  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1187
1188  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
1189
1190  // It is an error to provide a -o option if we are making multiple output
1191  // files.
1192  if (FinalOutput) {
1193    unsigned NumOutputs = 0;
1194    for (ActionList::const_iterator it = C.getActions().begin(),
1195           ie = C.getActions().end(); it != ie; ++it)
1196      if ((*it)->getType() != types::TY_Nothing)
1197        ++NumOutputs;
1198
1199    if (NumOutputs > 1) {
1200      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
1201      FinalOutput = 0;
1202    }
1203  }
1204
1205  for (ActionList::const_iterator it = C.getActions().begin(),
1206         ie = C.getActions().end(); it != ie; ++it) {
1207    Action *A = *it;
1208
1209    // If we are linking an image for multiple archs then the linker wants
1210    // -arch_multiple and -final_output <final image name>. Unfortunately, this
1211    // doesn't fit in cleanly because we have to pass this information down.
1212    //
1213    // FIXME: This is a hack; find a cleaner way to integrate this into the
1214    // process.
1215    const char *LinkingOutput = 0;
1216    if (isa<LipoJobAction>(A)) {
1217      if (FinalOutput)
1218        LinkingOutput = FinalOutput->getValue();
1219      else
1220        LinkingOutput = DefaultImageName.c_str();
1221    }
1222
1223    InputInfo II;
1224    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
1225                       /*BoundArch*/0,
1226                       /*AtTopLevel*/ true,
1227                       /*LinkingOutput*/ LinkingOutput,
1228                       II);
1229  }
1230
1231  // If the user passed -Qunused-arguments or there were errors, don't warn
1232  // about any unused arguments.
1233  if (Diags.hasErrorOccurred() ||
1234      C.getArgs().hasArg(options::OPT_Qunused_arguments))
1235    return;
1236
1237  // Claim -### here.
1238  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
1239
1240  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1241       it != ie; ++it) {
1242    Arg *A = *it;
1243
1244    // FIXME: It would be nice to be able to send the argument to the
1245    // DiagnosticsEngine, so that extra values, position, and so on could be
1246    // printed.
1247    if (!A->isClaimed()) {
1248      if (A->getOption().hasFlag(options::NoArgumentUnused))
1249        continue;
1250
1251      // Suppress the warning automatically if this is just a flag, and it is an
1252      // instance of an argument we already claimed.
1253      const Option &Opt = A->getOption();
1254      if (Opt.getKind() == Option::FlagClass) {
1255        bool DuplicateClaimed = false;
1256
1257        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
1258               ie = C.getArgs().filtered_end(); it != ie; ++it) {
1259          if ((*it)->isClaimed()) {
1260            DuplicateClaimed = true;
1261            break;
1262          }
1263        }
1264
1265        if (DuplicateClaimed)
1266          continue;
1267      }
1268
1269      Diag(clang::diag::warn_drv_unused_argument)
1270        << A->getAsString(C.getArgs());
1271    }
1272  }
1273}
1274
1275static const Tool &SelectToolForJob(Compilation &C, const ToolChain *TC,
1276                                    const JobAction *JA,
1277                                    const ActionList *&Inputs) {
1278  const Tool *ToolForJob = 0;
1279
1280  // See if we should look for a compiler with an integrated assembler. We match
1281  // bottom up, so what we are actually looking for is an assembler job with a
1282  // compiler input.
1283
1284  if (C.getArgs().hasFlag(options::OPT_integrated_as,
1285                          options::OPT_no_integrated_as,
1286                          TC->IsIntegratedAssemblerDefault()) &&
1287      !C.getArgs().hasArg(options::OPT_save_temps) &&
1288      isa<AssembleJobAction>(JA) &&
1289      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1290    const Tool &Compiler = TC->SelectTool(
1291      C, cast<JobAction>(**Inputs->begin()), (*Inputs)[0]->getInputs());
1292    if (Compiler.hasIntegratedAssembler()) {
1293      Inputs = &(*Inputs)[0]->getInputs();
1294      ToolForJob = &Compiler;
1295    }
1296  }
1297
1298  // Otherwise use the tool for the current job.
1299  if (!ToolForJob)
1300    ToolForJob = &TC->SelectTool(C, *JA, *Inputs);
1301
1302  // See if we should use an integrated preprocessor. We do so when we have
1303  // exactly one input, since this is the only use case we care about
1304  // (irrelevant since we don't support combine yet).
1305  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1306      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1307      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1308      !C.getArgs().hasArg(options::OPT_save_temps) &&
1309      !C.getArgs().hasArg(options::OPT_rewrite_objc) &&
1310      ToolForJob->hasIntegratedCPP())
1311    Inputs = &(*Inputs)[0]->getInputs();
1312
1313  return *ToolForJob;
1314}
1315
1316void Driver::BuildJobsForAction(Compilation &C,
1317                                const Action *A,
1318                                const ToolChain *TC,
1319                                const char *BoundArch,
1320                                bool AtTopLevel,
1321                                const char *LinkingOutput,
1322                                InputInfo &Result) const {
1323  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1324
1325  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1326    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1327    // just using Args was better?
1328    const Arg &Input = IA->getInputArg();
1329    Input.claim();
1330    if (Input.getOption().matches(options::OPT_INPUT)) {
1331      const char *Name = Input.getValue();
1332      Result = InputInfo(Name, A->getType(), Name);
1333    } else
1334      Result = InputInfo(&Input, A->getType(), "");
1335    return;
1336  }
1337
1338  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1339    const ToolChain *TC;
1340    const char *ArchName = BAA->getArchName();
1341
1342    if (ArchName)
1343      TC = &getToolChain(C.getArgs(), ArchName);
1344    else
1345      TC = &C.getDefaultToolChain();
1346
1347    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1348                       AtTopLevel, LinkingOutput, Result);
1349    return;
1350  }
1351
1352  const ActionList *Inputs = &A->getInputs();
1353
1354  const JobAction *JA = cast<JobAction>(A);
1355  const Tool &T = SelectToolForJob(C, TC, JA, Inputs);
1356
1357  // Only use pipes when there is exactly one input.
1358  InputInfoList InputInfos;
1359  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1360       it != ie; ++it) {
1361    // Treat dsymutil sub-jobs as being at the top-level too, they shouldn't get
1362    // temporary output names.
1363    //
1364    // FIXME: Clean this up.
1365    bool SubJobAtTopLevel = false;
1366    if (AtTopLevel && isa<DsymutilJobAction>(A))
1367      SubJobAtTopLevel = true;
1368
1369    // Also treat verify sub-jobs as being at the top-level. They don't
1370    // produce any output and so don't need temporary output names.
1371    if (AtTopLevel && isa<VerifyJobAction>(A))
1372      SubJobAtTopLevel = true;
1373
1374    InputInfo II;
1375    BuildJobsForAction(C, *it, TC, BoundArch,
1376                       SubJobAtTopLevel, LinkingOutput, II);
1377    InputInfos.push_back(II);
1378  }
1379
1380  // Always use the first input as the base input.
1381  const char *BaseInput = InputInfos[0].getBaseInput();
1382
1383  // ... except dsymutil actions, which use their actual input as the base
1384  // input.
1385  if (JA->getType() == types::TY_dSYM)
1386    BaseInput = InputInfos[0].getFilename();
1387
1388  // Determine the place to write output to, if any.
1389  if (JA->getType() == types::TY_Nothing) {
1390    Result = InputInfo(A->getType(), BaseInput);
1391  } else {
1392    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, AtTopLevel),
1393                       A->getType(), BaseInput);
1394  }
1395
1396  if (CCCPrintBindings && !CCGenDiagnostics) {
1397    llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
1398                 << " - \"" << T.getName() << "\", inputs: [";
1399    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1400      llvm::errs() << InputInfos[i].getAsString();
1401      if (i + 1 != e)
1402        llvm::errs() << ", ";
1403    }
1404    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1405  } else {
1406    T.ConstructJob(C, *JA, Result, InputInfos,
1407                   C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1408  }
1409}
1410
1411const char *Driver::GetNamedOutputPath(Compilation &C,
1412                                       const JobAction &JA,
1413                                       const char *BaseInput,
1414                                       bool AtTopLevel) const {
1415  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1416  // Output to a user requested destination?
1417  if (AtTopLevel && !isa<DsymutilJobAction>(JA) &&
1418      !isa<VerifyJobAction>(JA)) {
1419    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1420      return C.addResultFile(FinalOutput->getValue());
1421  }
1422
1423  // Default to writing to stdout?
1424  if (AtTopLevel && isa<PreprocessJobAction>(JA) && !CCGenDiagnostics)
1425    return "-";
1426
1427  // Output to a temporary file?
1428  if ((!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) ||
1429      CCGenDiagnostics) {
1430    StringRef Name = llvm::sys::path::filename(BaseInput);
1431    std::pair<StringRef, StringRef> Split = Name.split('.');
1432    std::string TmpName =
1433      GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1434    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1435  }
1436
1437  SmallString<128> BasePath(BaseInput);
1438  StringRef BaseName;
1439
1440  // Dsymutil actions should use the full path.
1441  if (isa<DsymutilJobAction>(JA) || isa<VerifyJobAction>(JA))
1442    BaseName = BasePath;
1443  else
1444    BaseName = llvm::sys::path::filename(BasePath);
1445
1446  // Determine what the derived output name should be.
1447  const char *NamedOutput;
1448  if (JA.getType() == types::TY_Image) {
1449    NamedOutput = DefaultImageName.c_str();
1450  } else {
1451    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1452    assert(Suffix && "All types used for output should have a suffix.");
1453
1454    std::string::size_type End = std::string::npos;
1455    if (!types::appendSuffixForType(JA.getType()))
1456      End = BaseName.rfind('.');
1457    std::string Suffixed(BaseName.substr(0, End));
1458    Suffixed += '.';
1459    Suffixed += Suffix;
1460    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1461  }
1462
1463  // If we're saving temps and the temp file conflicts with the input file,
1464  // then avoid overwriting input file.
1465  if (!AtTopLevel && C.getArgs().hasArg(options::OPT_save_temps) &&
1466      NamedOutput == BaseName) {
1467
1468    bool SameFile = false;
1469    SmallString<256> Result;
1470    llvm::sys::fs::current_path(Result);
1471    llvm::sys::path::append(Result, BaseName);
1472    llvm::sys::fs::equivalent(BaseInput, Result.c_str(), SameFile);
1473    // Must share the same path to conflict.
1474    if (SameFile) {
1475      StringRef Name = llvm::sys::path::filename(BaseInput);
1476      std::pair<StringRef, StringRef> Split = Name.split('.');
1477      std::string TmpName =
1478        GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1479      return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1480    }
1481  }
1482
1483  // As an annoying special case, PCH generation doesn't strip the pathname.
1484  if (JA.getType() == types::TY_PCH) {
1485    llvm::sys::path::remove_filename(BasePath);
1486    if (BasePath.empty())
1487      BasePath = NamedOutput;
1488    else
1489      llvm::sys::path::append(BasePath, NamedOutput);
1490    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()));
1491  } else {
1492    return C.addResultFile(NamedOutput);
1493  }
1494}
1495
1496std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1497  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1498  // attempting to use this prefix when looking for file paths.
1499  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1500       ie = PrefixDirs.end(); it != ie; ++it) {
1501    std::string Dir(*it);
1502    if (Dir.empty())
1503      continue;
1504    if (Dir[0] == '=')
1505      Dir = SysRoot + Dir.substr(1);
1506    llvm::sys::Path P(Dir);
1507    P.appendComponent(Name);
1508    bool Exists;
1509    if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1510      return P.str();
1511  }
1512
1513  llvm::sys::Path P(ResourceDir);
1514  P.appendComponent(Name);
1515  bool Exists;
1516  if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1517    return P.str();
1518
1519  const ToolChain::path_list &List = TC.getFilePaths();
1520  for (ToolChain::path_list::const_iterator
1521         it = List.begin(), ie = List.end(); it != ie; ++it) {
1522    std::string Dir(*it);
1523    if (Dir.empty())
1524      continue;
1525    if (Dir[0] == '=')
1526      Dir = SysRoot + Dir.substr(1);
1527    llvm::sys::Path P(Dir);
1528    P.appendComponent(Name);
1529    bool Exists;
1530    if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1531      return P.str();
1532  }
1533
1534  return Name;
1535}
1536
1537std::string Driver::GetProgramPath(const char *Name,
1538                                   const ToolChain &TC) const {
1539  // FIXME: Needs a better variable than DefaultTargetTriple
1540  std::string TargetSpecificExecutable(DefaultTargetTriple + "-" + Name);
1541  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1542  // attempting to use this prefix when looking for program paths.
1543  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1544       ie = PrefixDirs.end(); it != ie; ++it) {
1545    bool IsDirectory;
1546    if (!llvm::sys::fs::is_directory(*it, IsDirectory) && IsDirectory) {
1547      llvm::sys::Path P(*it);
1548      P.appendComponent(TargetSpecificExecutable);
1549      if (P.canExecute()) return P.str();
1550      P.eraseComponent();
1551      P.appendComponent(Name);
1552      if (P.canExecute()) return P.str();
1553    } else {
1554      llvm::sys::Path P(*it + Name);
1555      if (P.canExecute()) return P.str();
1556    }
1557  }
1558
1559  const ToolChain::path_list &List = TC.getProgramPaths();
1560  for (ToolChain::path_list::const_iterator
1561         it = List.begin(), ie = List.end(); it != ie; ++it) {
1562    llvm::sys::Path P(*it);
1563    P.appendComponent(TargetSpecificExecutable);
1564    if (P.canExecute()) return P.str();
1565    P.eraseComponent();
1566    P.appendComponent(Name);
1567    if (P.canExecute()) return P.str();
1568  }
1569
1570  // If all else failed, search the path.
1571  llvm::sys::Path
1572      P(llvm::sys::Program::FindProgramByName(TargetSpecificExecutable));
1573  if (!P.empty())
1574    return P.str();
1575
1576  P = llvm::sys::Path(llvm::sys::Program::FindProgramByName(Name));
1577  if (!P.empty())
1578    return P.str();
1579
1580  return Name;
1581}
1582
1583std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
1584  const {
1585  // FIXME: This is lame; sys::Path should provide this function (in particular,
1586  // it should know how to find the temporary files dir).
1587  std::string Error;
1588  const char *TmpDir = ::getenv("TMPDIR");
1589  if (!TmpDir)
1590    TmpDir = ::getenv("TEMP");
1591  if (!TmpDir)
1592    TmpDir = ::getenv("TMP");
1593  if (!TmpDir)
1594    TmpDir = "/tmp";
1595  llvm::sys::Path P(TmpDir);
1596  P.appendComponent(Prefix);
1597  if (P.makeUnique(false, &Error)) {
1598    Diag(clang::diag::err_unable_to_make_temp) << Error;
1599    return "";
1600  }
1601
1602  // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
1603  P.eraseFromDisk(false, 0);
1604
1605  if (Suffix)
1606    P.appendSuffix(Suffix);
1607  return P.str();
1608}
1609
1610/// \brief Compute target triple from args.
1611///
1612/// This routine provides the logic to compute a target triple from various
1613/// args passed to the driver and the default triple string.
1614static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
1615                                        const ArgList &Args,
1616                                        StringRef DarwinArchName) {
1617  // FIXME: Already done in Compilation *Driver::BuildCompilation
1618  if (const Arg *A = Args.getLastArg(options::OPT_target))
1619    DefaultTargetTriple = A->getValue();
1620
1621  llvm::Triple Target(llvm::Triple::normalize(DefaultTargetTriple));
1622
1623  // Handle Darwin-specific options available here.
1624  if (Target.isOSDarwin()) {
1625    // If an explict Darwin arch name is given, that trumps all.
1626    if (!DarwinArchName.empty()) {
1627      Target.setArch(
1628        tools::darwin::getArchTypeForDarwinArchName(DarwinArchName));
1629      return Target;
1630    }
1631
1632    // Handle the Darwin '-arch' flag.
1633    if (Arg *A = Args.getLastArg(options::OPT_arch)) {
1634      llvm::Triple::ArchType DarwinArch
1635        = tools::darwin::getArchTypeForDarwinArchName(A->getValue());
1636      if (DarwinArch != llvm::Triple::UnknownArch)
1637        Target.setArch(DarwinArch);
1638    }
1639  }
1640
1641  // Skip further flag support on OSes which don't support '-m32' or '-m64'.
1642  if (Target.getArchName() == "tce" ||
1643      Target.getOS() == llvm::Triple::AuroraUX ||
1644      Target.getOS() == llvm::Triple::Minix)
1645    return Target;
1646
1647  // Handle pseudo-target flags '-m32' and '-m64'.
1648  // FIXME: Should this information be in llvm::Triple?
1649  if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
1650    if (A->getOption().matches(options::OPT_m32)) {
1651      if (Target.getArch() == llvm::Triple::x86_64)
1652        Target.setArch(llvm::Triple::x86);
1653      if (Target.getArch() == llvm::Triple::ppc64)
1654        Target.setArch(llvm::Triple::ppc);
1655    } else {
1656      if (Target.getArch() == llvm::Triple::x86)
1657        Target.setArch(llvm::Triple::x86_64);
1658      if (Target.getArch() == llvm::Triple::ppc)
1659        Target.setArch(llvm::Triple::ppc64);
1660    }
1661  }
1662
1663  return Target;
1664}
1665
1666const ToolChain &Driver::getToolChain(const ArgList &Args,
1667                                      StringRef DarwinArchName) const {
1668  llvm::Triple Target = computeTargetTriple(DefaultTargetTriple, Args,
1669                                            DarwinArchName);
1670
1671  ToolChain *&TC = ToolChains[Target.str()];
1672  if (!TC) {
1673    switch (Target.getOS()) {
1674    case llvm::Triple::AuroraUX:
1675      TC = new toolchains::AuroraUX(*this, Target, Args);
1676      break;
1677    case llvm::Triple::Darwin:
1678    case llvm::Triple::MacOSX:
1679    case llvm::Triple::IOS:
1680      if (Target.getArch() == llvm::Triple::x86 ||
1681          Target.getArch() == llvm::Triple::x86_64 ||
1682          Target.getArch() == llvm::Triple::arm ||
1683          Target.getArch() == llvm::Triple::thumb)
1684        TC = new toolchains::DarwinClang(*this, Target);
1685      else
1686        TC = new toolchains::Darwin_Generic_GCC(*this, Target, Args);
1687      break;
1688    case llvm::Triple::DragonFly:
1689      TC = new toolchains::DragonFly(*this, Target, Args);
1690      break;
1691    case llvm::Triple::OpenBSD:
1692      TC = new toolchains::OpenBSD(*this, Target, Args);
1693      break;
1694    case llvm::Triple::Bitrig:
1695      TC = new toolchains::Bitrig(*this, Target, Args);
1696      break;
1697    case llvm::Triple::NetBSD:
1698      TC = new toolchains::NetBSD(*this, Target, Args);
1699      break;
1700    case llvm::Triple::FreeBSD:
1701      TC = new toolchains::FreeBSD(*this, Target, Args);
1702      break;
1703    case llvm::Triple::Minix:
1704      TC = new toolchains::Minix(*this, Target, Args);
1705      break;
1706    case llvm::Triple::Linux:
1707      if (Target.getArch() == llvm::Triple::hexagon)
1708        TC = new toolchains::Hexagon_TC(*this, Target);
1709      else
1710        TC = new toolchains::Linux(*this, Target, Args);
1711      break;
1712    case llvm::Triple::Solaris:
1713      TC = new toolchains::Solaris(*this, Target, Args);
1714      break;
1715    case llvm::Triple::Win32:
1716      TC = new toolchains::Windows(*this, Target);
1717      break;
1718    case llvm::Triple::MinGW32:
1719      // FIXME: We need a MinGW toolchain. Fallthrough for now.
1720    default:
1721      // TCE is an OSless target
1722      if (Target.getArchName() == "tce") {
1723        TC = new toolchains::TCEToolChain(*this, Target);
1724        break;
1725      }
1726
1727      TC = new toolchains::Generic_GCC(*this, Target, Args);
1728      break;
1729    }
1730  }
1731  return *TC;
1732}
1733
1734bool Driver::ShouldUseClangCompiler(const Compilation &C, const JobAction &JA,
1735                                    const llvm::Triple &Triple) const {
1736  // Check if user requested no clang, or clang doesn't understand this type (we
1737  // only handle single inputs for now).
1738  if (JA.size() != 1 ||
1739      !types::isAcceptedByClang((*JA.begin())->getType()))
1740    return false;
1741
1742  // Otherwise make sure this is an action clang understands.
1743  if (!isa<PreprocessJobAction>(JA) && !isa<PrecompileJobAction>(JA) &&
1744      !isa<CompileJobAction>(JA))
1745    return false;
1746
1747  return true;
1748}
1749
1750/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1751/// grouped values as integers. Numbers which are not provided are set to 0.
1752///
1753/// \return True if the entire string was parsed (9.2), or all groups were
1754/// parsed (10.3.5extrastuff).
1755bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1756                               unsigned &Minor, unsigned &Micro,
1757                               bool &HadExtra) {
1758  HadExtra = false;
1759
1760  Major = Minor = Micro = 0;
1761  if (*Str == '\0')
1762    return true;
1763
1764  char *End;
1765  Major = (unsigned) strtol(Str, &End, 10);
1766  if (*Str != '\0' && *End == '\0')
1767    return true;
1768  if (*End != '.')
1769    return false;
1770
1771  Str = End+1;
1772  Minor = (unsigned) strtol(Str, &End, 10);
1773  if (*Str != '\0' && *End == '\0')
1774    return true;
1775  if (*End != '.')
1776    return false;
1777
1778  Str = End+1;
1779  Micro = (unsigned) strtol(Str, &End, 10);
1780  if (*Str != '\0' && *End == '\0')
1781    return true;
1782  if (Str == End)
1783    return false;
1784  HadExtra = true;
1785  return true;
1786}
1787