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/Config/config.h"
15#include "clang/Driver/Action.h"
16#include "clang/Driver/Compilation.h"
17#include "clang/Driver/DriverDiagnostic.h"
18#include "clang/Driver/Job.h"
19#include "clang/Driver/Options.h"
20#include "clang/Driver/Tool.h"
21#include "clang/Driver/ToolChain.h"
22#include "llvm/ADT/ArrayRef.h"
23#include "llvm/ADT/STLExtras.h"
24#include "llvm/ADT/StringExtras.h"
25#include "llvm/ADT/StringSet.h"
26#include "llvm/ADT/StringSwitch.h"
27#include "llvm/Option/Arg.h"
28#include "llvm/Option/ArgList.h"
29#include "llvm/Option/OptSpecifier.h"
30#include "llvm/Option/OptTable.h"
31#include "llvm/Option/Option.h"
32#include "llvm/Support/Debug.h"
33#include "llvm/Support/ErrorHandling.h"
34#include "llvm/Support/FileSystem.h"
35#include "llvm/Support/Path.h"
36#include "llvm/Support/PrettyStackTrace.h"
37#include "llvm/Support/Process.h"
38#include "llvm/Support/Program.h"
39#include "llvm/Support/raw_ostream.h"
40#include <map>
41#include <memory>
42
43using namespace clang::driver;
44using namespace clang;
45using namespace llvm::opt;
46
47Driver::Driver(StringRef ClangExecutable,
48               StringRef DefaultTargetTriple,
49               DiagnosticsEngine &Diags)
50  : Opts(createDriverOptTable()), Diags(Diags), Mode(GCCMode),
51    ClangExecutable(ClangExecutable), SysRoot(DEFAULT_SYSROOT),
52    UseStdLib(true), DefaultTargetTriple(DefaultTargetTriple),
53    DefaultImageName("a.out"),
54    DriverTitle("clang LLVM compiler"),
55    CCPrintOptionsFilename(nullptr), CCPrintHeadersFilename(nullptr),
56    CCLogDiagnosticsFilename(nullptr),
57    CCCPrintBindings(false),
58    CCPrintHeaders(false), CCLogDiagnostics(false),
59    CCGenDiagnostics(false), CCCGenericGCCName(""), CheckInputsExist(true),
60    CCCUsePCH(true), SuppressMissingInputWarning(false) {
61
62  Name = llvm::sys::path::stem(ClangExecutable);
63  Dir  = llvm::sys::path::parent_path(ClangExecutable);
64
65  // Compute the path to the resource directory.
66  StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
67  SmallString<128> P(Dir);
68  if (ClangResourceDir != "")
69    llvm::sys::path::append(P, ClangResourceDir);
70  else
71    llvm::sys::path::append(P, "..", "lib", "clang", CLANG_VERSION_STRING);
72  ResourceDir = P.str();
73}
74
75Driver::~Driver() {
76  delete Opts;
77
78  llvm::DeleteContainerSeconds(ToolChains);
79}
80
81void Driver::ParseDriverMode(ArrayRef<const char *> Args) {
82  const std::string OptName =
83    getOpts().getOption(options::OPT_driver_mode).getPrefixedName();
84
85  for (size_t I = 0, E = Args.size(); I != E; ++I) {
86    const StringRef Arg = Args[I];
87    if (!Arg.startswith(OptName))
88      continue;
89
90    const StringRef Value = Arg.drop_front(OptName.size());
91    const unsigned M = llvm::StringSwitch<unsigned>(Value)
92        .Case("gcc", GCCMode)
93        .Case("g++", GXXMode)
94        .Case("cpp", CPPMode)
95        .Case("cl",  CLMode)
96        .Default(~0U);
97
98    if (M != ~0U)
99      Mode = static_cast<DriverMode>(M);
100    else
101      Diag(diag::err_drv_unsupported_option_argument) << OptName << Value;
102  }
103}
104
105InputArgList *Driver::ParseArgStrings(ArrayRef<const char *> ArgList) {
106  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
107
108  unsigned IncludedFlagsBitmask;
109  unsigned ExcludedFlagsBitmask;
110  std::tie(IncludedFlagsBitmask, ExcludedFlagsBitmask) =
111    getIncludeExcludeOptionFlagMasks();
112
113  unsigned MissingArgIndex, MissingArgCount;
114  InputArgList *Args = getOpts().ParseArgs(ArgList.begin(), ArgList.end(),
115                                           MissingArgIndex, MissingArgCount,
116                                           IncludedFlagsBitmask,
117                                           ExcludedFlagsBitmask);
118
119  // Check for missing argument error.
120  if (MissingArgCount)
121    Diag(clang::diag::err_drv_missing_argument)
122      << Args->getArgString(MissingArgIndex) << MissingArgCount;
123
124  // Check for unsupported options.
125  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
126       it != ie; ++it) {
127    Arg *A = *it;
128    if (A->getOption().hasFlag(options::Unsupported)) {
129      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
130      continue;
131    }
132
133    // Warn about -mcpu= without an argument.
134    if (A->getOption().matches(options::OPT_mcpu_EQ) &&
135        A->containsValue("")) {
136      Diag(clang::diag::warn_drv_empty_joined_argument) <<
137        A->getAsString(*Args);
138    }
139  }
140
141  for (arg_iterator it = Args->filtered_begin(options::OPT_UNKNOWN),
142         ie = Args->filtered_end(); it != ie; ++it) {
143    Diags.Report(diag::err_drv_unknown_argument) << (*it) ->getAsString(*Args);
144  }
145
146  return Args;
147}
148
149// Determine which compilation mode we are in. We look for options which
150// affect the phase, starting with the earliest phases, and record which
151// option we used to determine the final phase.
152phases::ID Driver::getFinalPhase(const DerivedArgList &DAL, Arg **FinalPhaseArg)
153const {
154  Arg *PhaseArg = nullptr;
155  phases::ID FinalPhase;
156
157  // -{E,EP,P,M,MM} only run the preprocessor.
158  if (CCCIsCPP() ||
159      (PhaseArg = DAL.getLastArg(options::OPT_E)) ||
160      (PhaseArg = DAL.getLastArg(options::OPT__SLASH_EP)) ||
161      (PhaseArg = DAL.getLastArg(options::OPT_M, options::OPT_MM)) ||
162      (PhaseArg = DAL.getLastArg(options::OPT__SLASH_P))) {
163    FinalPhase = phases::Preprocess;
164
165    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
166  } else if ((PhaseArg = DAL.getLastArg(options::OPT_fsyntax_only)) ||
167             (PhaseArg = DAL.getLastArg(options::OPT_module_file_info)) ||
168             (PhaseArg = DAL.getLastArg(options::OPT_verify_pch)) ||
169             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_objc)) ||
170             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_legacy_objc)) ||
171             (PhaseArg = DAL.getLastArg(options::OPT__migrate)) ||
172             (PhaseArg = DAL.getLastArg(options::OPT__analyze,
173                                        options::OPT__analyze_auto)) ||
174             (PhaseArg = DAL.getLastArg(options::OPT_emit_ast)) ||
175             (PhaseArg = DAL.getLastArg(options::OPT_S))) {
176    FinalPhase = phases::Compile;
177
178    // -c only runs up to the assembler.
179  } else if ((PhaseArg = DAL.getLastArg(options::OPT_c))) {
180    FinalPhase = phases::Assemble;
181
182    // Otherwise do everything.
183  } else
184    FinalPhase = phases::Link;
185
186  if (FinalPhaseArg)
187    *FinalPhaseArg = PhaseArg;
188
189  return FinalPhase;
190}
191
192static Arg* MakeInputArg(DerivedArgList &Args, OptTable *Opts,
193                         StringRef Value) {
194  Arg *A = new Arg(Opts->getOption(options::OPT_INPUT), Value,
195                   Args.getBaseArgs().MakeIndex(Value), Value.data());
196  Args.AddSynthesizedArg(A);
197  A->claim();
198  return A;
199}
200
201DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
202  DerivedArgList *DAL = new DerivedArgList(Args);
203
204  bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
205  for (ArgList::const_iterator it = Args.begin(),
206         ie = Args.end(); it != ie; ++it) {
207    const Arg *A = *it;
208
209    // Unfortunately, we have to parse some forwarding options (-Xassembler,
210    // -Xlinker, -Xpreprocessor) because we either integrate their functionality
211    // (assembler and preprocessor), or bypass a previous driver ('collect2').
212
213    // Rewrite linker options, to replace --no-demangle with a custom internal
214    // option.
215    if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
216         A->getOption().matches(options::OPT_Xlinker)) &&
217        A->containsValue("--no-demangle")) {
218      // Add the rewritten no-demangle argument.
219      DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_Xlinker__no_demangle));
220
221      // Add the remaining values as Xlinker arguments.
222      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
223        if (StringRef(A->getValue(i)) != "--no-demangle")
224          DAL->AddSeparateArg(A, Opts->getOption(options::OPT_Xlinker),
225                              A->getValue(i));
226
227      continue;
228    }
229
230    // Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
231    // some build systems. We don't try to be complete here because we don't
232    // care to encourage this usage model.
233    if (A->getOption().matches(options::OPT_Wp_COMMA) &&
234        (A->getValue(0) == StringRef("-MD") ||
235         A->getValue(0) == StringRef("-MMD"))) {
236      // Rewrite to -MD/-MMD along with -MF.
237      if (A->getValue(0) == StringRef("-MD"))
238        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MD));
239      else
240        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MMD));
241      if (A->getNumValues() == 2)
242        DAL->AddSeparateArg(A, Opts->getOption(options::OPT_MF),
243                            A->getValue(1));
244      continue;
245    }
246
247    // Rewrite reserved library names.
248    if (A->getOption().matches(options::OPT_l)) {
249      StringRef Value = A->getValue();
250
251      // Rewrite unless -nostdlib is present.
252      if (!HasNostdlib && Value == "stdc++") {
253        DAL->AddFlagArg(A, Opts->getOption(
254                              options::OPT_Z_reserved_lib_stdcxx));
255        continue;
256      }
257
258      // Rewrite unconditionally.
259      if (Value == "cc_kext") {
260        DAL->AddFlagArg(A, Opts->getOption(
261                              options::OPT_Z_reserved_lib_cckext));
262        continue;
263      }
264    }
265
266    // Pick up inputs via the -- option.
267    if (A->getOption().matches(options::OPT__DASH_DASH)) {
268      A->claim();
269      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
270        DAL->append(MakeInputArg(*DAL, Opts, A->getValue(i)));
271      continue;
272    }
273
274    DAL->append(*it);
275  }
276
277  // Add a default value of -mlinker-version=, if one was given and the user
278  // didn't specify one.
279#if defined(HOST_LINK_VERSION)
280  if (!Args.hasArg(options::OPT_mlinker_version_EQ)) {
281    DAL->AddJoinedArg(0, Opts->getOption(options::OPT_mlinker_version_EQ),
282                      HOST_LINK_VERSION);
283    DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
284  }
285#endif
286
287  return DAL;
288}
289
290Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
291  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
292
293  // FIXME: Handle environment options which affect driver behavior, somewhere
294  // (client?). GCC_EXEC_PREFIX, LPATH, CC_PRINT_OPTIONS.
295
296  if (char *env = ::getenv("COMPILER_PATH")) {
297    StringRef CompilerPath = env;
298    while (!CompilerPath.empty()) {
299      std::pair<StringRef, StringRef> Split
300        = CompilerPath.split(llvm::sys::EnvPathSeparator);
301      PrefixDirs.push_back(Split.first);
302      CompilerPath = Split.second;
303    }
304  }
305
306  // We look for the driver mode option early, because the mode can affect
307  // how other options are parsed.
308  ParseDriverMode(ArgList.slice(1));
309
310  // FIXME: What are we going to do with -V and -b?
311
312  // FIXME: This stuff needs to go into the Compilation, not the driver.
313  bool CCCPrintActions;
314
315  InputArgList *Args = ParseArgStrings(ArgList.slice(1));
316
317  // -no-canonical-prefixes is used very early in main.
318  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
319
320  // Ignore -pipe.
321  Args->ClaimAllArgs(options::OPT_pipe);
322
323  // Extract -ccc args.
324  //
325  // FIXME: We need to figure out where this behavior should live. Most of it
326  // should be outside in the client; the parts that aren't should have proper
327  // options, either by introducing new ones or by overloading gcc ones like -V
328  // or -b.
329  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
330  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
331  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
332    CCCGenericGCCName = A->getValue();
333  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
334                            options::OPT_ccc_pch_is_pth);
335  // FIXME: DefaultTargetTriple is used by the target-prefixed calls to as/ld
336  // and getToolChain is const.
337  if (IsCLMode()) {
338    // clang-cl targets MSVC-style Win32.
339    llvm::Triple T(DefaultTargetTriple);
340    T.setOS(llvm::Triple::Win32);
341    T.setEnvironment(llvm::Triple::MSVC);
342    DefaultTargetTriple = T.str();
343  }
344  if (const Arg *A = Args->getLastArg(options::OPT_target))
345    DefaultTargetTriple = A->getValue();
346  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
347    Dir = InstalledDir = A->getValue();
348  for (arg_iterator it = Args->filtered_begin(options::OPT_B),
349         ie = Args->filtered_end(); it != ie; ++it) {
350    const Arg *A = *it;
351    A->claim();
352    PrefixDirs.push_back(A->getValue(0));
353  }
354  if (const Arg *A = Args->getLastArg(options::OPT__sysroot_EQ))
355    SysRoot = A->getValue();
356  if (const Arg *A = Args->getLastArg(options::OPT__dyld_prefix_EQ))
357    DyldPrefix = A->getValue();
358  if (Args->hasArg(options::OPT_nostdlib))
359    UseStdLib = false;
360
361  if (const Arg *A = Args->getLastArg(options::OPT_resource_dir))
362    ResourceDir = A->getValue();
363
364  // Perform the default argument translations.
365  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
366
367  // Owned by the host.
368  const ToolChain &TC = getToolChain(*Args);
369
370  // The compilation takes ownership of Args.
371  Compilation *C = new Compilation(*this, TC, Args, TranslatedArgs);
372
373  if (!HandleImmediateArgs(*C))
374    return C;
375
376  // Construct the list of inputs.
377  InputList Inputs;
378  BuildInputs(C->getDefaultToolChain(), *TranslatedArgs, Inputs);
379
380  // Construct the list of abstract actions to perform for this compilation. On
381  // MachO targets this uses the driver-driver and universal actions.
382  if (TC.getTriple().isOSBinFormatMachO())
383    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
384                          Inputs, C->getActions());
385  else
386    BuildActions(C->getDefaultToolChain(), C->getArgs(), Inputs,
387                 C->getActions());
388
389  if (CCCPrintActions) {
390    PrintActions(*C);
391    return C;
392  }
393
394  BuildJobs(*C);
395
396  return C;
397}
398
399// When clang crashes, produce diagnostic information including the fully
400// preprocessed source file(s).  Request that the developer attach the
401// diagnostic information to a bug report.
402void Driver::generateCompilationDiagnostics(Compilation &C,
403                                            const Command *FailingCommand) {
404  if (C.getArgs().hasArg(options::OPT_fno_crash_diagnostics))
405    return;
406
407  // Don't try to generate diagnostics for link or dsymutil jobs.
408  if (FailingCommand && (FailingCommand->getCreator().isLinkJob() ||
409                         FailingCommand->getCreator().isDsymutilJob()))
410    return;
411
412  // Print the version of the compiler.
413  PrintVersion(C, llvm::errs());
414
415  Diag(clang::diag::note_drv_command_failed_diag_msg)
416    << "PLEASE submit a bug report to " BUG_REPORT_URL " and include the "
417    "crash backtrace, preprocessed source, and associated run script.";
418
419  // Suppress driver output and emit preprocessor output to temp file.
420  Mode = CPPMode;
421  CCGenDiagnostics = true;
422
423  // Save the original job command(s).
424  std::string Cmd;
425  llvm::raw_string_ostream OS(Cmd);
426  if (FailingCommand)
427    FailingCommand->Print(OS, "\n", /*Quote*/ false, /*CrashReport*/ true);
428  else
429    // Crash triggered by FORCE_CLANG_DIAGNOSTICS_CRASH, which doesn't have an
430    // associated FailingCommand, so just pass all jobs.
431    C.getJobs().Print(OS, "\n", /*Quote*/ false, /*CrashReport*/ true);
432  OS.flush();
433
434  // Keep track of whether we produce any errors while trying to produce
435  // preprocessed sources.
436  DiagnosticErrorTrap Trap(Diags);
437
438  // Suppress tool output.
439  C.initCompilationForDiagnostics();
440
441  // Construct the list of inputs.
442  InputList Inputs;
443  BuildInputs(C.getDefaultToolChain(), C.getArgs(), Inputs);
444
445  for (InputList::iterator it = Inputs.begin(), ie = Inputs.end(); it != ie;) {
446    bool IgnoreInput = false;
447
448    // Ignore input from stdin or any inputs that cannot be preprocessed.
449    // Check type first as not all linker inputs have a value.
450   if (types::getPreprocessedType(it->first) == types::TY_INVALID) {
451      IgnoreInput = true;
452    } else if (!strcmp(it->second->getValue(), "-")) {
453      Diag(clang::diag::note_drv_command_failed_diag_msg)
454        << "Error generating preprocessed source(s) - ignoring input from stdin"
455        ".";
456      IgnoreInput = true;
457    }
458
459    if (IgnoreInput) {
460      it = Inputs.erase(it);
461      ie = Inputs.end();
462    } else {
463      ++it;
464    }
465  }
466
467  if (Inputs.empty()) {
468    Diag(clang::diag::note_drv_command_failed_diag_msg)
469      << "Error generating preprocessed source(s) - no preprocessable inputs.";
470    return;
471  }
472
473  // Don't attempt to generate preprocessed files if multiple -arch options are
474  // used, unless they're all duplicates.
475  llvm::StringSet<> ArchNames;
476  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
477       it != ie; ++it) {
478    Arg *A = *it;
479    if (A->getOption().matches(options::OPT_arch)) {
480      StringRef ArchName = A->getValue();
481      ArchNames.insert(ArchName);
482    }
483  }
484  if (ArchNames.size() > 1) {
485    Diag(clang::diag::note_drv_command_failed_diag_msg)
486      << "Error generating preprocessed source(s) - cannot generate "
487      "preprocessed source with multiple -arch options.";
488    return;
489  }
490
491  // Construct the list of abstract actions to perform for this compilation. On
492  // Darwin OSes this uses the driver-driver and builds universal actions.
493  const ToolChain &TC = C.getDefaultToolChain();
494  if (TC.getTriple().isOSBinFormatMachO())
495    BuildUniversalActions(TC, C.getArgs(), Inputs, C.getActions());
496  else
497    BuildActions(TC, C.getArgs(), Inputs, C.getActions());
498
499  BuildJobs(C);
500
501  // If there were errors building the compilation, quit now.
502  if (Trap.hasErrorOccurred()) {
503    Diag(clang::diag::note_drv_command_failed_diag_msg)
504      << "Error generating preprocessed source(s).";
505    return;
506  }
507
508  // Generate preprocessed output.
509  SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
510  C.ExecuteJob(C.getJobs(), FailingCommands);
511
512  // If the command succeeded, we are done.
513  if (FailingCommands.empty()) {
514    Diag(clang::diag::note_drv_command_failed_diag_msg)
515      << "\n********************\n\n"
516      "PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:\n"
517      "Preprocessed source(s) and associated run script(s) are located at:";
518    ArgStringList Files = C.getTempFiles();
519    for (ArgStringList::const_iterator it = Files.begin(), ie = Files.end();
520         it != ie; ++it) {
521      Diag(clang::diag::note_drv_command_failed_diag_msg) << *it;
522      std::string Script = StringRef(*it).rsplit('.').first;
523      // In some cases (modules) we'll dump extra data to help with reproducing
524      // the crash into a directory next to the output.
525      SmallString<128> VFS;
526      if (llvm::sys::fs::exists(Script + ".cache")) {
527        Diag(clang::diag::note_drv_command_failed_diag_msg)
528            << Script + ".cache";
529        VFS = llvm::sys::path::filename(Script + ".cache");
530        llvm::sys::path::append(VFS, "vfs", "vfs.yaml");
531      }
532
533      std::string Err;
534      Script += ".sh";
535      llvm::raw_fd_ostream ScriptOS(Script.c_str(), Err, llvm::sys::fs::F_Excl);
536      if (!Err.empty()) {
537        Diag(clang::diag::note_drv_command_failed_diag_msg)
538          << "Error generating run script: " + Script + " " + Err;
539      } else {
540        // Replace the original filename with the preprocessed one.
541        size_t I, E;
542        I = Cmd.find("-main-file-name ");
543        assert (I != std::string::npos && "Expected to find -main-file-name");
544        I += 16;
545        E = Cmd.find(" ", I);
546        assert (E != std::string::npos && "-main-file-name missing argument?");
547        StringRef OldFilename = StringRef(Cmd).slice(I, E);
548        StringRef NewFilename = llvm::sys::path::filename(*it);
549        I = StringRef(Cmd).rfind(OldFilename);
550        E = I + OldFilename.size();
551        I = Cmd.rfind(" ", I) + 1;
552        Cmd.replace(I, E - I, NewFilename.data(), NewFilename.size());
553        if (!VFS.empty()) {
554          // Add the VFS overlay to the reproduction script.
555          I += NewFilename.size();
556          Cmd.insert(I, std::string(" -ivfsoverlay ") + VFS.c_str());
557        }
558        ScriptOS << Cmd;
559        Diag(clang::diag::note_drv_command_failed_diag_msg) << Script;
560      }
561    }
562    Diag(clang::diag::note_drv_command_failed_diag_msg)
563      << "\n\n********************";
564  } else {
565    // Failure, remove preprocessed files.
566    if (!C.getArgs().hasArg(options::OPT_save_temps))
567      C.CleanupFileList(C.getTempFiles(), true);
568
569    Diag(clang::diag::note_drv_command_failed_diag_msg)
570      << "Error generating preprocessed source(s).";
571  }
572}
573
574int Driver::ExecuteCompilation(const Compilation &C,
575    SmallVectorImpl< std::pair<int, const Command *> > &FailingCommands) const {
576  // Just print if -### was present.
577  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
578    C.getJobs().Print(llvm::errs(), "\n", true);
579    return 0;
580  }
581
582  // If there were errors building the compilation, quit now.
583  if (Diags.hasErrorOccurred())
584    return 1;
585
586  C.ExecuteJob(C.getJobs(), FailingCommands);
587
588  // Remove temp files.
589  C.CleanupFileList(C.getTempFiles());
590
591  // If the command succeeded, we are done.
592  if (FailingCommands.empty())
593    return 0;
594
595  // Otherwise, remove result files and print extra information about abnormal
596  // failures.
597  for (SmallVectorImpl< std::pair<int, const Command *> >::iterator it =
598         FailingCommands.begin(), ie = FailingCommands.end(); it != ie; ++it) {
599    int Res = it->first;
600    const Command *FailingCommand = it->second;
601
602    // Remove result files if we're not saving temps.
603    if (!C.getArgs().hasArg(options::OPT_save_temps)) {
604      const JobAction *JA = cast<JobAction>(&FailingCommand->getSource());
605      C.CleanupFileMap(C.getResultFiles(), JA, true);
606
607      // Failure result files are valid unless we crashed.
608      if (Res < 0)
609        C.CleanupFileMap(C.getFailureResultFiles(), JA, true);
610    }
611
612    // Print extra information about abnormal failures, if possible.
613    //
614    // This is ad-hoc, but we don't want to be excessively noisy. If the result
615    // status was 1, assume the command failed normally. In particular, if it
616    // was the compiler then assume it gave a reasonable error code. Failures
617    // in other tools are less common, and they generally have worse
618    // diagnostics, so always print the diagnostic there.
619    const Tool &FailingTool = FailingCommand->getCreator();
620
621    if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
622      // FIXME: See FIXME above regarding result code interpretation.
623      if (Res < 0)
624        Diag(clang::diag::err_drv_command_signalled)
625          << FailingTool.getShortName();
626      else
627        Diag(clang::diag::err_drv_command_failed)
628          << FailingTool.getShortName() << Res;
629    }
630  }
631  return 0;
632}
633
634void Driver::PrintHelp(bool ShowHidden) const {
635  unsigned IncludedFlagsBitmask;
636  unsigned ExcludedFlagsBitmask;
637  std::tie(IncludedFlagsBitmask, ExcludedFlagsBitmask) =
638    getIncludeExcludeOptionFlagMasks();
639
640  ExcludedFlagsBitmask |= options::NoDriverOption;
641  if (!ShowHidden)
642    ExcludedFlagsBitmask |= HelpHidden;
643
644  getOpts().PrintHelp(llvm::outs(), Name.c_str(), DriverTitle.c_str(),
645                      IncludedFlagsBitmask, ExcludedFlagsBitmask);
646}
647
648void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
649  // FIXME: The following handlers should use a callback mechanism, we don't
650  // know what the client would like to do.
651  OS << getClangFullVersion() << '\n';
652  const ToolChain &TC = C.getDefaultToolChain();
653  OS << "Target: " << TC.getTripleString() << '\n';
654
655  // Print the threading model.
656  //
657  // FIXME: Implement correctly.
658  OS << "Thread model: " << "posix" << '\n';
659}
660
661/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
662/// option.
663static void PrintDiagnosticCategories(raw_ostream &OS) {
664  // Skip the empty category.
665  for (unsigned i = 1, max = DiagnosticIDs::getNumberOfCategories();
666       i != max; ++i)
667    OS << i << ',' << DiagnosticIDs::getCategoryNameFromID(i) << '\n';
668}
669
670bool Driver::HandleImmediateArgs(const Compilation &C) {
671  // The order these options are handled in gcc is all over the place, but we
672  // don't expect inconsistencies w.r.t. that to matter in practice.
673
674  if (C.getArgs().hasArg(options::OPT_dumpmachine)) {
675    llvm::outs() << C.getDefaultToolChain().getTripleString() << '\n';
676    return false;
677  }
678
679  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
680    // Since -dumpversion is only implemented for pedantic GCC compatibility, we
681    // return an answer which matches our definition of __VERSION__.
682    //
683    // If we want to return a more correct answer some day, then we should
684    // introduce a non-pedantically GCC compatible mode to Clang in which we
685    // provide sensible definitions for -dumpversion, __VERSION__, etc.
686    llvm::outs() << "4.2.1\n";
687    return false;
688  }
689
690  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
691    PrintDiagnosticCategories(llvm::outs());
692    return false;
693  }
694
695  if (C.getArgs().hasArg(options::OPT_help) ||
696      C.getArgs().hasArg(options::OPT__help_hidden)) {
697    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
698    return false;
699  }
700
701  if (C.getArgs().hasArg(options::OPT__version)) {
702    // Follow gcc behavior and use stdout for --version and stderr for -v.
703    PrintVersion(C, llvm::outs());
704    return false;
705  }
706
707  if (C.getArgs().hasArg(options::OPT_v) ||
708      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
709    PrintVersion(C, llvm::errs());
710    SuppressMissingInputWarning = true;
711  }
712
713  const ToolChain &TC = C.getDefaultToolChain();
714
715  if (C.getArgs().hasArg(options::OPT_v))
716    TC.printVerboseInfo(llvm::errs());
717
718  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
719    llvm::outs() << "programs: =";
720    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
721           ie = TC.getProgramPaths().end(); it != ie; ++it) {
722      if (it != TC.getProgramPaths().begin())
723        llvm::outs() << ':';
724      llvm::outs() << *it;
725    }
726    llvm::outs() << "\n";
727    llvm::outs() << "libraries: =" << ResourceDir;
728
729    StringRef sysroot = C.getSysRoot();
730
731    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
732           ie = TC.getFilePaths().end(); it != ie; ++it) {
733      llvm::outs() << ':';
734      const char *path = it->c_str();
735      if (path[0] == '=')
736        llvm::outs() << sysroot << path + 1;
737      else
738        llvm::outs() << path;
739    }
740    llvm::outs() << "\n";
741    return false;
742  }
743
744  // FIXME: The following handlers should use a callback mechanism, we don't
745  // know what the client would like to do.
746  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
747    llvm::outs() << GetFilePath(A->getValue(), TC) << "\n";
748    return false;
749  }
750
751  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
752    llvm::outs() << GetProgramPath(A->getValue(), TC) << "\n";
753    return false;
754  }
755
756  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
757    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
758    return false;
759  }
760
761  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
762    const MultilibSet &Multilibs = TC.getMultilibs();
763
764    for (MultilibSet::const_iterator I = Multilibs.begin(), E = Multilibs.end();
765         I != E; ++I) {
766      llvm::outs() << *I << "\n";
767    }
768    return false;
769  }
770
771  if (C.getArgs().hasArg(options::OPT_print_multi_directory)) {
772    const MultilibSet &Multilibs = TC.getMultilibs();
773    for (MultilibSet::const_iterator I = Multilibs.begin(), E = Multilibs.end();
774         I != E; ++I) {
775      if (I->gccSuffix().empty())
776        llvm::outs() << ".\n";
777      else {
778        StringRef Suffix(I->gccSuffix());
779        assert(Suffix.front() == '/');
780        llvm::outs() << Suffix.substr(1) << "\n";
781      }
782    }
783    return false;
784  }
785
786  if (C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
787    // FIXME: This should print out "lib/../lib", "lib/../lib64", or
788    // "lib/../lib32" as appropriate for the toolchain. For now, print
789    // nothing because it's not supported yet.
790    return false;
791  }
792
793  return true;
794}
795
796static unsigned PrintActions1(const Compilation &C, Action *A,
797                              std::map<Action*, unsigned> &Ids) {
798  if (Ids.count(A))
799    return Ids[A];
800
801  std::string str;
802  llvm::raw_string_ostream os(str);
803
804  os << Action::getClassName(A->getKind()) << ", ";
805  if (InputAction *IA = dyn_cast<InputAction>(A)) {
806    os << "\"" << IA->getInputArg().getValue() << "\"";
807  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
808    os << '"' << BIA->getArchName() << '"'
809       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
810  } else {
811    os << "{";
812    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
813      os << PrintActions1(C, *it, Ids);
814      ++it;
815      if (it != ie)
816        os << ", ";
817    }
818    os << "}";
819  }
820
821  unsigned Id = Ids.size();
822  Ids[A] = Id;
823  llvm::errs() << Id << ": " << os.str() << ", "
824               << types::getTypeName(A->getType()) << "\n";
825
826  return Id;
827}
828
829void Driver::PrintActions(const Compilation &C) const {
830  std::map<Action*, unsigned> Ids;
831  for (ActionList::const_iterator it = C.getActions().begin(),
832         ie = C.getActions().end(); it != ie; ++it)
833    PrintActions1(C, *it, Ids);
834}
835
836/// \brief Check whether the given input tree contains any compilation or
837/// assembly actions.
838static bool ContainsCompileOrAssembleAction(const Action *A) {
839  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
840    return true;
841
842  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
843    if (ContainsCompileOrAssembleAction(*it))
844      return true;
845
846  return false;
847}
848
849void Driver::BuildUniversalActions(const ToolChain &TC,
850                                   DerivedArgList &Args,
851                                   const InputList &BAInputs,
852                                   ActionList &Actions) const {
853  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
854  // Collect the list of architectures. Duplicates are allowed, but should only
855  // be handled once (in the order seen).
856  llvm::StringSet<> ArchNames;
857  SmallVector<const char *, 4> Archs;
858  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
859       it != ie; ++it) {
860    Arg *A = *it;
861
862    if (A->getOption().matches(options::OPT_arch)) {
863      // Validate the option here; we don't save the type here because its
864      // particular spelling may participate in other driver choices.
865      llvm::Triple::ArchType Arch =
866        tools::darwin::getArchTypeForMachOArchName(A->getValue());
867      if (Arch == llvm::Triple::UnknownArch) {
868        Diag(clang::diag::err_drv_invalid_arch_name)
869          << A->getAsString(Args);
870        continue;
871      }
872
873      A->claim();
874      if (ArchNames.insert(A->getValue()))
875        Archs.push_back(A->getValue());
876    }
877  }
878
879  // When there is no explicit arch for this platform, make sure we still bind
880  // the architecture (to the default) so that -Xarch_ is handled correctly.
881  if (!Archs.size())
882    Archs.push_back(Args.MakeArgString(TC.getDefaultUniversalArchName()));
883
884  ActionList SingleActions;
885  BuildActions(TC, Args, BAInputs, SingleActions);
886
887  // Add in arch bindings for every top level action, as well as lipo and
888  // dsymutil steps if needed.
889  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
890    Action *Act = SingleActions[i];
891
892    // Make sure we can lipo this kind of output. If not (and it is an actual
893    // output) then we disallow, since we can't create an output file with the
894    // right name without overwriting it. We could remove this oddity by just
895    // changing the output names to include the arch, which would also fix
896    // -save-temps. Compatibility wins for now.
897
898    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
899      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
900        << types::getTypeName(Act->getType());
901
902    ActionList Inputs;
903    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
904      Inputs.push_back(new BindArchAction(Act, Archs[i]));
905      if (i != 0)
906        Inputs.back()->setOwnsInputs(false);
907    }
908
909    // Lipo if necessary, we do it this way because we need to set the arch flag
910    // so that -Xarch_ gets overwritten.
911    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
912      Actions.append(Inputs.begin(), Inputs.end());
913    else
914      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
915
916    // Handle debug info queries.
917    Arg *A = Args.getLastArg(options::OPT_g_Group);
918    if (A && !A->getOption().matches(options::OPT_g0) &&
919        !A->getOption().matches(options::OPT_gstabs) &&
920        ContainsCompileOrAssembleAction(Actions.back())) {
921
922      // Add a 'dsymutil' step if necessary, when debug info is enabled and we
923      // have a compile input. We need to run 'dsymutil' ourselves in such cases
924      // because the debug info will refer to a temporary object file which
925      // will be removed at the end of the compilation process.
926      if (Act->getType() == types::TY_Image) {
927        ActionList Inputs;
928        Inputs.push_back(Actions.back());
929        Actions.pop_back();
930        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
931      }
932
933      // Verify the debug info output.
934      if (Args.hasArg(options::OPT_verify_debug_info)) {
935        Action *VerifyInput = Actions.back();
936        Actions.pop_back();
937        Actions.push_back(new VerifyDebugInfoJobAction(VerifyInput,
938                                                       types::TY_Nothing));
939      }
940    }
941  }
942}
943
944/// \brief Check that the file referenced by Value exists. If it doesn't,
945/// issue a diagnostic and return false.
946static bool DiagnoseInputExistence(const Driver &D, const DerivedArgList &Args,
947                                   StringRef Value) {
948  if (!D.getCheckInputsExist())
949    return true;
950
951  // stdin always exists.
952  if (Value == "-")
953    return true;
954
955  SmallString<64> Path(Value);
956  if (Arg *WorkDir = Args.getLastArg(options::OPT_working_directory)) {
957    if (!llvm::sys::path::is_absolute(Path.str())) {
958      SmallString<64> Directory(WorkDir->getValue());
959      llvm::sys::path::append(Directory, Value);
960      Path.assign(Directory);
961    }
962  }
963
964  if (llvm::sys::fs::exists(Twine(Path)))
965    return true;
966
967  if (D.IsCLMode() && llvm::sys::Process::FindInEnvPath("LIB", Value))
968    return true;
969
970  D.Diag(clang::diag::err_drv_no_such_file) << Path.str();
971  return false;
972}
973
974// Construct a the list of inputs and their types.
975void Driver::BuildInputs(const ToolChain &TC, DerivedArgList &Args,
976                         InputList &Inputs) const {
977  // Track the current user specified (-x) input. We also explicitly track the
978  // argument used to set the type; we only want to claim the type when we
979  // actually use it, so we warn about unused -x arguments.
980  types::ID InputType = types::TY_Nothing;
981  Arg *InputTypeArg = nullptr;
982
983  // The last /TC or /TP option sets the input type to C or C++ globally.
984  if (Arg *TCTP = Args.getLastArg(options::OPT__SLASH_TC,
985                                  options::OPT__SLASH_TP)) {
986    InputTypeArg = TCTP;
987    InputType = TCTP->getOption().matches(options::OPT__SLASH_TC)
988        ? types::TY_C : types::TY_CXX;
989
990    arg_iterator it = Args.filtered_begin(options::OPT__SLASH_TC,
991                                          options::OPT__SLASH_TP);
992    const arg_iterator ie = Args.filtered_end();
993    Arg *Previous = *it++;
994    bool ShowNote = false;
995    while (it != ie) {
996      Diag(clang::diag::warn_drv_overriding_flag_option)
997          << Previous->getSpelling() << (*it)->getSpelling();
998      Previous = *it++;
999      ShowNote = true;
1000    }
1001    if (ShowNote)
1002      Diag(clang::diag::note_drv_t_option_is_global);
1003
1004    // No driver mode exposes -x and /TC or /TP; we don't support mixing them.
1005    assert(!Args.hasArg(options::OPT_x) && "-x and /TC or /TP is not allowed");
1006  }
1007
1008  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
1009       it != ie; ++it) {
1010    Arg *A = *it;
1011
1012    if (A->getOption().getKind() == Option::InputClass) {
1013      const char *Value = A->getValue();
1014      types::ID Ty = types::TY_INVALID;
1015
1016      // Infer the input type if necessary.
1017      if (InputType == types::TY_Nothing) {
1018        // If there was an explicit arg for this, claim it.
1019        if (InputTypeArg)
1020          InputTypeArg->claim();
1021
1022        // stdin must be handled specially.
1023        if (memcmp(Value, "-", 2) == 0) {
1024          // If running with -E, treat as a C input (this changes the builtin
1025          // macros, for example). This may be overridden by -ObjC below.
1026          //
1027          // Otherwise emit an error but still use a valid type to avoid
1028          // spurious errors (e.g., no inputs).
1029          if (!Args.hasArgNoClaim(options::OPT_E) && !CCCIsCPP())
1030            Diag(IsCLMode() ? clang::diag::err_drv_unknown_stdin_type_clang_cl
1031                            : clang::diag::err_drv_unknown_stdin_type);
1032          Ty = types::TY_C;
1033        } else {
1034          // Otherwise lookup by extension.
1035          // Fallback is C if invoked as C preprocessor or Object otherwise.
1036          // We use a host hook here because Darwin at least has its own
1037          // idea of what .s is.
1038          if (const char *Ext = strrchr(Value, '.'))
1039            Ty = TC.LookupTypeForExtension(Ext + 1);
1040
1041          if (Ty == types::TY_INVALID) {
1042            if (CCCIsCPP())
1043              Ty = types::TY_C;
1044            else
1045              Ty = types::TY_Object;
1046          }
1047
1048          // If the driver is invoked as C++ compiler (like clang++ or c++) it
1049          // should autodetect some input files as C++ for g++ compatibility.
1050          if (CCCIsCXX()) {
1051            types::ID OldTy = Ty;
1052            Ty = types::lookupCXXTypeForCType(Ty);
1053
1054            if (Ty != OldTy)
1055              Diag(clang::diag::warn_drv_treating_input_as_cxx)
1056                << getTypeName(OldTy) << getTypeName(Ty);
1057          }
1058        }
1059
1060        // -ObjC and -ObjC++ override the default language, but only for "source
1061        // files". We just treat everything that isn't a linker input as a
1062        // source file.
1063        //
1064        // FIXME: Clean this up if we move the phase sequence into the type.
1065        if (Ty != types::TY_Object) {
1066          if (Args.hasArg(options::OPT_ObjC))
1067            Ty = types::TY_ObjC;
1068          else if (Args.hasArg(options::OPT_ObjCXX))
1069            Ty = types::TY_ObjCXX;
1070        }
1071      } else {
1072        assert(InputTypeArg && "InputType set w/o InputTypeArg");
1073        InputTypeArg->claim();
1074        Ty = InputType;
1075      }
1076
1077      if (DiagnoseInputExistence(*this, Args, Value))
1078        Inputs.push_back(std::make_pair(Ty, A));
1079
1080    } else if (A->getOption().matches(options::OPT__SLASH_Tc)) {
1081      StringRef Value = A->getValue();
1082      if (DiagnoseInputExistence(*this, Args, Value)) {
1083        Arg *InputArg = MakeInputArg(Args, Opts, A->getValue());
1084        Inputs.push_back(std::make_pair(types::TY_C, InputArg));
1085      }
1086      A->claim();
1087    } else if (A->getOption().matches(options::OPT__SLASH_Tp)) {
1088      StringRef Value = A->getValue();
1089      if (DiagnoseInputExistence(*this, Args, Value)) {
1090        Arg *InputArg = MakeInputArg(Args, Opts, A->getValue());
1091        Inputs.push_back(std::make_pair(types::TY_CXX, InputArg));
1092      }
1093      A->claim();
1094    } else if (A->getOption().hasFlag(options::LinkerInput)) {
1095      // Just treat as object type, we could make a special type for this if
1096      // necessary.
1097      Inputs.push_back(std::make_pair(types::TY_Object, A));
1098
1099    } else if (A->getOption().matches(options::OPT_x)) {
1100      InputTypeArg = A;
1101      InputType = types::lookupTypeForTypeSpecifier(A->getValue());
1102      A->claim();
1103
1104      // Follow gcc behavior and treat as linker input for invalid -x
1105      // options. Its not clear why we shouldn't just revert to unknown; but
1106      // this isn't very important, we might as well be bug compatible.
1107      if (!InputType) {
1108        Diag(clang::diag::err_drv_unknown_language) << A->getValue();
1109        InputType = types::TY_Object;
1110      }
1111    }
1112  }
1113  if (CCCIsCPP() && Inputs.empty()) {
1114    // If called as standalone preprocessor, stdin is processed
1115    // if no other input is present.
1116    Arg *A = MakeInputArg(Args, Opts, "-");
1117    Inputs.push_back(std::make_pair(types::TY_C, A));
1118  }
1119}
1120
1121void Driver::BuildActions(const ToolChain &TC, DerivedArgList &Args,
1122                          const InputList &Inputs, ActionList &Actions) const {
1123  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
1124
1125  if (!SuppressMissingInputWarning && Inputs.empty()) {
1126    Diag(clang::diag::err_drv_no_input_files);
1127    return;
1128  }
1129
1130  Arg *FinalPhaseArg;
1131  phases::ID FinalPhase = getFinalPhase(Args, &FinalPhaseArg);
1132
1133  if (FinalPhase == phases::Link && Args.hasArg(options::OPT_emit_llvm)) {
1134    Diag(clang::diag::err_drv_emit_llvm_link);
1135  }
1136
1137  // Reject -Z* at the top level, these options should never have been exposed
1138  // by gcc.
1139  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
1140    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
1141
1142  // Diagnose misuse of /Fo.
1143  if (Arg *A = Args.getLastArg(options::OPT__SLASH_Fo)) {
1144    StringRef V = A->getValue();
1145    if (V.empty()) {
1146      // It has to have a value.
1147      Diag(clang::diag::err_drv_missing_argument) << A->getSpelling() << 1;
1148      Args.eraseArg(options::OPT__SLASH_Fo);
1149    } else if (Inputs.size() > 1 && !llvm::sys::path::is_separator(V.back())) {
1150      // Check whether /Fo tries to name an output file for multiple inputs.
1151      Diag(clang::diag::err_drv_out_file_argument_with_multiple_sources)
1152        << A->getSpelling() << V;
1153      Args.eraseArg(options::OPT__SLASH_Fo);
1154    }
1155  }
1156
1157  // Diagnose misuse of /Fa.
1158  if (Arg *A = Args.getLastArg(options::OPT__SLASH_Fa)) {
1159    StringRef V = A->getValue();
1160    if (Inputs.size() > 1 && !llvm::sys::path::is_separator(V.back())) {
1161      // Check whether /Fa tries to name an asm file for multiple inputs.
1162      Diag(clang::diag::err_drv_out_file_argument_with_multiple_sources)
1163        << A->getSpelling() << V;
1164      Args.eraseArg(options::OPT__SLASH_Fa);
1165    }
1166  }
1167
1168  // Diagnose misuse of /Fe.
1169  if (Arg *A = Args.getLastArg(options::OPT__SLASH_Fe)) {
1170    if (A->getValue()[0] == '\0') {
1171      // It has to have a value.
1172      Diag(clang::diag::err_drv_missing_argument) << A->getSpelling() << 1;
1173      Args.eraseArg(options::OPT__SLASH_Fe);
1174    }
1175  }
1176
1177  // Construct the actions to perform.
1178  ActionList LinkerInputs;
1179
1180  llvm::SmallVector<phases::ID, phases::MaxNumberOfPhases> PL;
1181  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1182    types::ID InputType = Inputs[i].first;
1183    const Arg *InputArg = Inputs[i].second;
1184
1185    PL.clear();
1186    types::getCompilationPhases(InputType, PL);
1187
1188    // If the first step comes after the final phase we are doing as part of
1189    // this compilation, warn the user about it.
1190    phases::ID InitialPhase = PL[0];
1191    if (InitialPhase > FinalPhase) {
1192      // Claim here to avoid the more general unused warning.
1193      InputArg->claim();
1194
1195      // Suppress all unused style warnings with -Qunused-arguments
1196      if (Args.hasArg(options::OPT_Qunused_arguments))
1197        continue;
1198
1199      // Special case when final phase determined by binary name, rather than
1200      // by a command-line argument with a corresponding Arg.
1201      if (CCCIsCPP())
1202        Diag(clang::diag::warn_drv_input_file_unused_by_cpp)
1203          << InputArg->getAsString(Args)
1204          << getPhaseName(InitialPhase);
1205      // Special case '-E' warning on a previously preprocessed file to make
1206      // more sense.
1207      else if (InitialPhase == phases::Compile &&
1208               FinalPhase == phases::Preprocess &&
1209               getPreprocessedType(InputType) == types::TY_INVALID)
1210        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
1211          << InputArg->getAsString(Args)
1212          << !!FinalPhaseArg
1213          << (FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "");
1214      else
1215        Diag(clang::diag::warn_drv_input_file_unused)
1216          << InputArg->getAsString(Args)
1217          << getPhaseName(InitialPhase)
1218          << !!FinalPhaseArg
1219          << (FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "");
1220      continue;
1221    }
1222
1223    // Build the pipeline for this file.
1224    std::unique_ptr<Action> Current(new InputAction(*InputArg, InputType));
1225    for (SmallVectorImpl<phases::ID>::iterator
1226           i = PL.begin(), e = PL.end(); i != e; ++i) {
1227      phases::ID Phase = *i;
1228
1229      // We are done if this step is past what the user requested.
1230      if (Phase > FinalPhase)
1231        break;
1232
1233      // Queue linker inputs.
1234      if (Phase == phases::Link) {
1235        assert((i + 1) == e && "linking must be final compilation step.");
1236        LinkerInputs.push_back(Current.release());
1237        break;
1238      }
1239
1240      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
1241      // encode this in the steps because the intermediate type depends on
1242      // arguments. Just special case here.
1243      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
1244        continue;
1245
1246      // Otherwise construct the appropriate action.
1247      Current.reset(ConstructPhaseAction(Args, Phase, Current.release()));
1248      if (Current->getType() == types::TY_Nothing)
1249        break;
1250    }
1251
1252    // If we ended with something, add to the output list.
1253    if (Current)
1254      Actions.push_back(Current.release());
1255  }
1256
1257  // Add a link action if necessary.
1258  if (!LinkerInputs.empty())
1259    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
1260
1261  // If we are linking, claim any options which are obviously only used for
1262  // compilation.
1263  if (FinalPhase == phases::Link && PL.size() == 1) {
1264    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
1265    Args.ClaimAllArgs(options::OPT_cl_compile_Group);
1266  }
1267
1268  // Claim ignored clang-cl options.
1269  Args.ClaimAllArgs(options::OPT_cl_ignored_Group);
1270}
1271
1272Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
1273                                     Action *Input) const {
1274  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
1275  // Build the appropriate action.
1276  switch (Phase) {
1277  case phases::Link: llvm_unreachable("link action invalid here.");
1278  case phases::Preprocess: {
1279    types::ID OutputTy;
1280    // -{M, MM} alter the output type.
1281    if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
1282      OutputTy = types::TY_Dependencies;
1283    } else {
1284      OutputTy = Input->getType();
1285      if (!Args.hasFlag(options::OPT_frewrite_includes,
1286                        options::OPT_fno_rewrite_includes, false) &&
1287          !CCGenDiagnostics)
1288        OutputTy = types::getPreprocessedType(OutputTy);
1289      assert(OutputTy != types::TY_INVALID &&
1290             "Cannot preprocess this input type!");
1291    }
1292    return new PreprocessJobAction(Input, OutputTy);
1293  }
1294  case phases::Precompile: {
1295    types::ID OutputTy = types::TY_PCH;
1296    if (Args.hasArg(options::OPT_fsyntax_only)) {
1297      // Syntax checks should not emit a PCH file
1298      OutputTy = types::TY_Nothing;
1299    }
1300    return new PrecompileJobAction(Input, OutputTy);
1301  }
1302  case phases::Compile: {
1303    if (Args.hasArg(options::OPT_fsyntax_only)) {
1304      return new CompileJobAction(Input, types::TY_Nothing);
1305    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
1306      return new CompileJobAction(Input, types::TY_RewrittenObjC);
1307    } else if (Args.hasArg(options::OPT_rewrite_legacy_objc)) {
1308      return new CompileJobAction(Input, types::TY_RewrittenLegacyObjC);
1309    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
1310      return new AnalyzeJobAction(Input, types::TY_Plist);
1311    } else if (Args.hasArg(options::OPT__migrate)) {
1312      return new MigrateJobAction(Input, types::TY_Remap);
1313    } else if (Args.hasArg(options::OPT_emit_ast)) {
1314      return new CompileJobAction(Input, types::TY_AST);
1315    } else if (Args.hasArg(options::OPT_module_file_info)) {
1316      return new CompileJobAction(Input, types::TY_ModuleFile);
1317    } else if (Args.hasArg(options::OPT_verify_pch)) {
1318      return new VerifyPCHJobAction(Input, types::TY_Nothing);
1319    } else if (IsUsingLTO(Args)) {
1320      types::ID Output =
1321        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
1322      return new CompileJobAction(Input, Output);
1323    } else if (Args.hasArg(options::OPT_emit_llvm)) {
1324      types::ID Output =
1325        Args.hasArg(options::OPT_S) ? types::TY_LLVM_IR : types::TY_LLVM_BC;
1326      return new CompileJobAction(Input, Output);
1327    } else {
1328      return new CompileJobAction(Input, types::TY_PP_Asm);
1329    }
1330  }
1331  case phases::Assemble:
1332    return new AssembleJobAction(Input, types::TY_Object);
1333  }
1334
1335  llvm_unreachable("invalid phase in ConstructPhaseAction");
1336}
1337
1338bool Driver::IsUsingLTO(const ArgList &Args) const {
1339  if (Args.hasFlag(options::OPT_flto, options::OPT_fno_lto, false))
1340    return true;
1341
1342  return false;
1343}
1344
1345void Driver::BuildJobs(Compilation &C) const {
1346  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1347
1348  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
1349
1350  // It is an error to provide a -o option if we are making multiple output
1351  // files.
1352  if (FinalOutput) {
1353    unsigned NumOutputs = 0;
1354    for (ActionList::const_iterator it = C.getActions().begin(),
1355           ie = C.getActions().end(); it != ie; ++it)
1356      if ((*it)->getType() != types::TY_Nothing)
1357        ++NumOutputs;
1358
1359    if (NumOutputs > 1) {
1360      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
1361      FinalOutput = nullptr;
1362    }
1363  }
1364
1365  // Collect the list of architectures.
1366  llvm::StringSet<> ArchNames;
1367  if (C.getDefaultToolChain().getTriple().isOSBinFormatMachO()) {
1368    for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1369         it != ie; ++it) {
1370      Arg *A = *it;
1371      if (A->getOption().matches(options::OPT_arch))
1372        ArchNames.insert(A->getValue());
1373    }
1374  }
1375
1376  for (ActionList::const_iterator it = C.getActions().begin(),
1377         ie = C.getActions().end(); it != ie; ++it) {
1378    Action *A = *it;
1379
1380    // If we are linking an image for multiple archs then the linker wants
1381    // -arch_multiple and -final_output <final image name>. Unfortunately, this
1382    // doesn't fit in cleanly because we have to pass this information down.
1383    //
1384    // FIXME: This is a hack; find a cleaner way to integrate this into the
1385    // process.
1386    const char *LinkingOutput = nullptr;
1387    if (isa<LipoJobAction>(A)) {
1388      if (FinalOutput)
1389        LinkingOutput = FinalOutput->getValue();
1390      else
1391        LinkingOutput = DefaultImageName.c_str();
1392    }
1393
1394    InputInfo II;
1395    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
1396                       /*BoundArch*/nullptr,
1397                       /*AtTopLevel*/ true,
1398                       /*MultipleArchs*/ ArchNames.size() > 1,
1399                       /*LinkingOutput*/ LinkingOutput,
1400                       II);
1401  }
1402
1403  // If the user passed -Qunused-arguments or there were errors, don't warn
1404  // about any unused arguments.
1405  if (Diags.hasErrorOccurred() ||
1406      C.getArgs().hasArg(options::OPT_Qunused_arguments))
1407    return;
1408
1409  // Claim -### here.
1410  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
1411
1412  // Claim --driver-mode, it was handled earlier.
1413  (void) C.getArgs().hasArg(options::OPT_driver_mode);
1414
1415  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1416       it != ie; ++it) {
1417    Arg *A = *it;
1418
1419    // FIXME: It would be nice to be able to send the argument to the
1420    // DiagnosticsEngine, so that extra values, position, and so on could be
1421    // printed.
1422    if (!A->isClaimed()) {
1423      if (A->getOption().hasFlag(options::NoArgumentUnused))
1424        continue;
1425
1426      // Suppress the warning automatically if this is just a flag, and it is an
1427      // instance of an argument we already claimed.
1428      const Option &Opt = A->getOption();
1429      if (Opt.getKind() == Option::FlagClass) {
1430        bool DuplicateClaimed = false;
1431
1432        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
1433               ie = C.getArgs().filtered_end(); it != ie; ++it) {
1434          if ((*it)->isClaimed()) {
1435            DuplicateClaimed = true;
1436            break;
1437          }
1438        }
1439
1440        if (DuplicateClaimed)
1441          continue;
1442      }
1443
1444      Diag(clang::diag::warn_drv_unused_argument)
1445        << A->getAsString(C.getArgs());
1446    }
1447  }
1448}
1449
1450static const Tool *SelectToolForJob(Compilation &C, const ToolChain *TC,
1451                                    const JobAction *JA,
1452                                    const ActionList *&Inputs) {
1453  const Tool *ToolForJob = nullptr;
1454
1455  // See if we should look for a compiler with an integrated assembler. We match
1456  // bottom up, so what we are actually looking for is an assembler job with a
1457  // compiler input.
1458
1459  if (TC->useIntegratedAs() &&
1460      !C.getArgs().hasArg(options::OPT_save_temps) &&
1461      !C.getArgs().hasArg(options::OPT_via_file_asm) &&
1462      !C.getArgs().hasArg(options::OPT__SLASH_FA) &&
1463      !C.getArgs().hasArg(options::OPT__SLASH_Fa) &&
1464      isa<AssembleJobAction>(JA) &&
1465      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1466    const Tool *Compiler =
1467      TC->SelectTool(cast<JobAction>(**Inputs->begin()));
1468    if (!Compiler)
1469      return nullptr;
1470    if (Compiler->hasIntegratedAssembler()) {
1471      Inputs = &(*Inputs)[0]->getInputs();
1472      ToolForJob = Compiler;
1473    }
1474  }
1475
1476  // Otherwise use the tool for the current job.
1477  if (!ToolForJob)
1478    ToolForJob = TC->SelectTool(*JA);
1479
1480  // See if we should use an integrated preprocessor. We do so when we have
1481  // exactly one input, since this is the only use case we care about
1482  // (irrelevant since we don't support combine yet).
1483  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1484      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1485      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1486      !C.getArgs().hasArg(options::OPT_save_temps) &&
1487      !C.getArgs().hasArg(options::OPT_rewrite_objc) &&
1488      ToolForJob->hasIntegratedCPP())
1489    Inputs = &(*Inputs)[0]->getInputs();
1490
1491  return ToolForJob;
1492}
1493
1494void Driver::BuildJobsForAction(Compilation &C,
1495                                const Action *A,
1496                                const ToolChain *TC,
1497                                const char *BoundArch,
1498                                bool AtTopLevel,
1499                                bool MultipleArchs,
1500                                const char *LinkingOutput,
1501                                InputInfo &Result) const {
1502  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1503
1504  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1505    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1506    // just using Args was better?
1507    const Arg &Input = IA->getInputArg();
1508    Input.claim();
1509    if (Input.getOption().matches(options::OPT_INPUT)) {
1510      const char *Name = Input.getValue();
1511      Result = InputInfo(Name, A->getType(), Name);
1512    } else
1513      Result = InputInfo(&Input, A->getType(), "");
1514    return;
1515  }
1516
1517  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1518    const ToolChain *TC;
1519    const char *ArchName = BAA->getArchName();
1520
1521    if (ArchName)
1522      TC = &getToolChain(C.getArgs(), ArchName);
1523    else
1524      TC = &C.getDefaultToolChain();
1525
1526    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1527                       AtTopLevel, MultipleArchs, LinkingOutput, Result);
1528    return;
1529  }
1530
1531  const ActionList *Inputs = &A->getInputs();
1532
1533  const JobAction *JA = cast<JobAction>(A);
1534  const Tool *T = SelectToolForJob(C, TC, JA, Inputs);
1535  if (!T)
1536    return;
1537
1538  // Only use pipes when there is exactly one input.
1539  InputInfoList InputInfos;
1540  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1541       it != ie; ++it) {
1542    // Treat dsymutil and verify sub-jobs as being at the top-level too, they
1543    // shouldn't get temporary output names.
1544    // FIXME: Clean this up.
1545    bool SubJobAtTopLevel = false;
1546    if (AtTopLevel && (isa<DsymutilJobAction>(A) || isa<VerifyJobAction>(A)))
1547      SubJobAtTopLevel = true;
1548
1549    InputInfo II;
1550    BuildJobsForAction(C, *it, TC, BoundArch, SubJobAtTopLevel, MultipleArchs,
1551                       LinkingOutput, II);
1552    InputInfos.push_back(II);
1553  }
1554
1555  // Always use the first input as the base input.
1556  const char *BaseInput = InputInfos[0].getBaseInput();
1557
1558  // ... except dsymutil actions, which use their actual input as the base
1559  // input.
1560  if (JA->getType() == types::TY_dSYM)
1561    BaseInput = InputInfos[0].getFilename();
1562
1563  // Determine the place to write output to, if any.
1564  if (JA->getType() == types::TY_Nothing)
1565    Result = InputInfo(A->getType(), BaseInput);
1566  else
1567    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, BoundArch,
1568                                          AtTopLevel, MultipleArchs),
1569                       A->getType(), BaseInput);
1570
1571  if (CCCPrintBindings && !CCGenDiagnostics) {
1572    llvm::errs() << "# \"" << T->getToolChain().getTripleString() << '"'
1573                 << " - \"" << T->getName() << "\", inputs: [";
1574    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1575      llvm::errs() << InputInfos[i].getAsString();
1576      if (i + 1 != e)
1577        llvm::errs() << ", ";
1578    }
1579    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1580  } else {
1581    T->ConstructJob(C, *JA, Result, InputInfos,
1582                    C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1583  }
1584}
1585
1586/// \brief Create output filename based on ArgValue, which could either be a
1587/// full filename, filename without extension, or a directory. If ArgValue
1588/// does not provide a filename, then use BaseName, and use the extension
1589/// suitable for FileType.
1590static const char *MakeCLOutputFilename(const ArgList &Args, StringRef ArgValue,
1591                                        StringRef BaseName, types::ID FileType) {
1592  SmallString<128> Filename = ArgValue;
1593
1594  if (ArgValue.empty()) {
1595    // If the argument is empty, output to BaseName in the current dir.
1596    Filename = BaseName;
1597  } else if (llvm::sys::path::is_separator(Filename.back())) {
1598    // If the argument is a directory, output to BaseName in that dir.
1599    llvm::sys::path::append(Filename, BaseName);
1600  }
1601
1602  if (!llvm::sys::path::has_extension(ArgValue)) {
1603    // If the argument didn't provide an extension, then set it.
1604    const char *Extension = types::getTypeTempSuffix(FileType, true);
1605
1606    if (FileType == types::TY_Image &&
1607        Args.hasArg(options::OPT__SLASH_LD, options::OPT__SLASH_LDd)) {
1608      // The output file is a dll.
1609      Extension = "dll";
1610    }
1611
1612    llvm::sys::path::replace_extension(Filename, Extension);
1613  }
1614
1615  return Args.MakeArgString(Filename.c_str());
1616}
1617
1618const char *Driver::GetNamedOutputPath(Compilation &C,
1619                                       const JobAction &JA,
1620                                       const char *BaseInput,
1621                                       const char *BoundArch,
1622                                       bool AtTopLevel,
1623                                       bool MultipleArchs) const {
1624  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1625  // Output to a user requested destination?
1626  if (AtTopLevel && !isa<DsymutilJobAction>(JA) &&
1627      !isa<VerifyJobAction>(JA)) {
1628    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1629      return C.addResultFile(FinalOutput->getValue(), &JA);
1630  }
1631
1632  // For /P, preprocess to file named after BaseInput.
1633  if (C.getArgs().hasArg(options::OPT__SLASH_P)) {
1634    assert(AtTopLevel && isa<PreprocessJobAction>(JA));
1635    StringRef BaseName = llvm::sys::path::filename(BaseInput);
1636    StringRef NameArg;
1637    if (Arg *A = C.getArgs().getLastArg(options::OPT__SLASH_Fi))
1638      NameArg = A->getValue();
1639    return C.addResultFile(MakeCLOutputFilename(C.getArgs(), NameArg, BaseName,
1640                                                types::TY_PP_C), &JA);
1641  }
1642
1643  // Default to writing to stdout?
1644  if (AtTopLevel && !CCGenDiagnostics &&
1645      (isa<PreprocessJobAction>(JA) || JA.getType() == types::TY_ModuleFile))
1646    return "-";
1647
1648  // Is this the assembly listing for /FA?
1649  if (JA.getType() == types::TY_PP_Asm &&
1650      (C.getArgs().hasArg(options::OPT__SLASH_FA) ||
1651       C.getArgs().hasArg(options::OPT__SLASH_Fa))) {
1652    // Use /Fa and the input filename to determine the asm file name.
1653    StringRef BaseName = llvm::sys::path::filename(BaseInput);
1654    StringRef FaValue = C.getArgs().getLastArgValue(options::OPT__SLASH_Fa);
1655    return C.addResultFile(MakeCLOutputFilename(C.getArgs(), FaValue, BaseName,
1656                                                JA.getType()), &JA);
1657  }
1658
1659  // Output to a temporary file?
1660  if ((!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps) &&
1661        !C.getArgs().hasArg(options::OPT__SLASH_Fo)) ||
1662      CCGenDiagnostics) {
1663    StringRef Name = llvm::sys::path::filename(BaseInput);
1664    std::pair<StringRef, StringRef> Split = Name.split('.');
1665    std::string TmpName =
1666      GetTemporaryPath(Split.first,
1667          types::getTypeTempSuffix(JA.getType(), IsCLMode()));
1668    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1669  }
1670
1671  SmallString<128> BasePath(BaseInput);
1672  StringRef BaseName;
1673
1674  // Dsymutil actions should use the full path.
1675  if (isa<DsymutilJobAction>(JA) || isa<VerifyJobAction>(JA))
1676    BaseName = BasePath;
1677  else
1678    BaseName = llvm::sys::path::filename(BasePath);
1679
1680  // Determine what the derived output name should be.
1681  const char *NamedOutput;
1682
1683  if (JA.getType() == types::TY_Object &&
1684      C.getArgs().hasArg(options::OPT__SLASH_Fo)) {
1685    // The /Fo flag decides the object filename.
1686    StringRef Val = C.getArgs().getLastArg(options::OPT__SLASH_Fo)->getValue();
1687    NamedOutput = MakeCLOutputFilename(C.getArgs(), Val, BaseName,
1688                                       types::TY_Object);
1689  } else if (JA.getType() == types::TY_Image &&
1690             C.getArgs().hasArg(options::OPT__SLASH_Fe)) {
1691    // The /Fe flag names the linked file.
1692    StringRef Val = C.getArgs().getLastArg(options::OPT__SLASH_Fe)->getValue();
1693    NamedOutput = MakeCLOutputFilename(C.getArgs(), Val, BaseName,
1694                                       types::TY_Image);
1695  } else if (JA.getType() == types::TY_Image) {
1696    if (IsCLMode()) {
1697      // clang-cl uses BaseName for the executable name.
1698      NamedOutput = MakeCLOutputFilename(C.getArgs(), "", BaseName,
1699                                         types::TY_Image);
1700    } else if (MultipleArchs && BoundArch) {
1701      SmallString<128> Output(DefaultImageName.c_str());
1702      Output += "-";
1703      Output.append(BoundArch);
1704      NamedOutput = C.getArgs().MakeArgString(Output.c_str());
1705    } else
1706      NamedOutput = DefaultImageName.c_str();
1707  } else {
1708    const char *Suffix = types::getTypeTempSuffix(JA.getType(), IsCLMode());
1709    assert(Suffix && "All types used for output should have a suffix.");
1710
1711    std::string::size_type End = std::string::npos;
1712    if (!types::appendSuffixForType(JA.getType()))
1713      End = BaseName.rfind('.');
1714    SmallString<128> Suffixed(BaseName.substr(0, End));
1715    if (MultipleArchs && BoundArch) {
1716      Suffixed += "-";
1717      Suffixed.append(BoundArch);
1718    }
1719    Suffixed += '.';
1720    Suffixed += Suffix;
1721    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1722  }
1723
1724  // If we're saving temps and the temp file conflicts with the input file,
1725  // then avoid overwriting input file.
1726  if (!AtTopLevel && C.getArgs().hasArg(options::OPT_save_temps) &&
1727      NamedOutput == BaseName) {
1728
1729    bool SameFile = false;
1730    SmallString<256> Result;
1731    llvm::sys::fs::current_path(Result);
1732    llvm::sys::path::append(Result, BaseName);
1733    llvm::sys::fs::equivalent(BaseInput, Result.c_str(), SameFile);
1734    // Must share the same path to conflict.
1735    if (SameFile) {
1736      StringRef Name = llvm::sys::path::filename(BaseInput);
1737      std::pair<StringRef, StringRef> Split = Name.split('.');
1738      std::string TmpName =
1739        GetTemporaryPath(Split.first,
1740            types::getTypeTempSuffix(JA.getType(), IsCLMode()));
1741      return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1742    }
1743  }
1744
1745  // As an annoying special case, PCH generation doesn't strip the pathname.
1746  if (JA.getType() == types::TY_PCH) {
1747    llvm::sys::path::remove_filename(BasePath);
1748    if (BasePath.empty())
1749      BasePath = NamedOutput;
1750    else
1751      llvm::sys::path::append(BasePath, NamedOutput);
1752    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()), &JA);
1753  } else {
1754    return C.addResultFile(NamedOutput, &JA);
1755  }
1756}
1757
1758std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1759  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1760  // attempting to use this prefix when looking for file paths.
1761  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1762       ie = PrefixDirs.end(); it != ie; ++it) {
1763    std::string Dir(*it);
1764    if (Dir.empty())
1765      continue;
1766    if (Dir[0] == '=')
1767      Dir = SysRoot + Dir.substr(1);
1768    SmallString<128> P(Dir);
1769    llvm::sys::path::append(P, Name);
1770    if (llvm::sys::fs::exists(Twine(P)))
1771      return P.str();
1772  }
1773
1774  SmallString<128> P(ResourceDir);
1775  llvm::sys::path::append(P, Name);
1776  if (llvm::sys::fs::exists(Twine(P)))
1777    return P.str();
1778
1779  const ToolChain::path_list &List = TC.getFilePaths();
1780  for (ToolChain::path_list::const_iterator
1781         it = List.begin(), ie = List.end(); it != ie; ++it) {
1782    std::string Dir(*it);
1783    if (Dir.empty())
1784      continue;
1785    if (Dir[0] == '=')
1786      Dir = SysRoot + Dir.substr(1);
1787    SmallString<128> P(Dir);
1788    llvm::sys::path::append(P, Name);
1789    if (llvm::sys::fs::exists(Twine(P)))
1790      return P.str();
1791  }
1792
1793  return Name;
1794}
1795
1796std::string Driver::GetProgramPath(const char *Name,
1797                                   const ToolChain &TC) const {
1798  // FIXME: Needs a better variable than DefaultTargetTriple
1799  std::string TargetSpecificExecutable(DefaultTargetTriple + "-" + Name);
1800  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1801  // attempting to use this prefix when looking for program paths.
1802  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1803       ie = PrefixDirs.end(); it != ie; ++it) {
1804    if (llvm::sys::fs::is_directory(*it)) {
1805      SmallString<128> P(*it);
1806      llvm::sys::path::append(P, TargetSpecificExecutable);
1807      if (llvm::sys::fs::can_execute(Twine(P)))
1808        return P.str();
1809      llvm::sys::path::remove_filename(P);
1810      llvm::sys::path::append(P, Name);
1811      if (llvm::sys::fs::can_execute(Twine(P)))
1812        return P.str();
1813    } else {
1814      SmallString<128> P(*it + Name);
1815      if (llvm::sys::fs::can_execute(Twine(P)))
1816        return P.str();
1817    }
1818  }
1819
1820  const ToolChain::path_list &List = TC.getProgramPaths();
1821  for (ToolChain::path_list::const_iterator
1822         it = List.begin(), ie = List.end(); it != ie; ++it) {
1823    SmallString<128> P(*it);
1824    llvm::sys::path::append(P, TargetSpecificExecutable);
1825    if (llvm::sys::fs::can_execute(Twine(P)))
1826      return P.str();
1827    llvm::sys::path::remove_filename(P);
1828    llvm::sys::path::append(P, Name);
1829    if (llvm::sys::fs::can_execute(Twine(P)))
1830      return P.str();
1831  }
1832
1833  // If all else failed, search the path.
1834  std::string P(llvm::sys::FindProgramByName(TargetSpecificExecutable));
1835  if (!P.empty())
1836    return P;
1837
1838  P = llvm::sys::FindProgramByName(Name);
1839  if (!P.empty())
1840    return P;
1841
1842  return Name;
1843}
1844
1845std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
1846  const {
1847  SmallString<128> Path;
1848  std::error_code EC = llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
1849  if (EC) {
1850    Diag(clang::diag::err_unable_to_make_temp) << EC.message();
1851    return "";
1852  }
1853
1854  return Path.str();
1855}
1856
1857/// \brief Compute target triple from args.
1858///
1859/// This routine provides the logic to compute a target triple from various
1860/// args passed to the driver and the default triple string.
1861static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
1862                                        const ArgList &Args,
1863                                        StringRef DarwinArchName) {
1864  // FIXME: Already done in Compilation *Driver::BuildCompilation
1865  if (const Arg *A = Args.getLastArg(options::OPT_target))
1866    DefaultTargetTriple = A->getValue();
1867
1868  llvm::Triple Target(llvm::Triple::normalize(DefaultTargetTriple));
1869
1870  // Handle Apple-specific options available here.
1871  if (Target.isOSBinFormatMachO()) {
1872    // If an explict Darwin arch name is given, that trumps all.
1873    if (!DarwinArchName.empty()) {
1874      tools::darwin::setTripleTypeForMachOArchName(Target, DarwinArchName);
1875      return Target;
1876    }
1877
1878    // Handle the Darwin '-arch' flag.
1879    if (Arg *A = Args.getLastArg(options::OPT_arch)) {
1880      StringRef ArchName = A->getValue();
1881      tools::darwin::setTripleTypeForMachOArchName(Target, ArchName);
1882    }
1883  }
1884
1885  // Handle pseudo-target flags '-mlittle-endian'/'-EL' and
1886  // '-mbig-endian'/'-EB'.
1887  if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
1888                               options::OPT_mbig_endian)) {
1889    if (A->getOption().matches(options::OPT_mlittle_endian)) {
1890      if (Target.getArch() == llvm::Triple::mips)
1891        Target.setArch(llvm::Triple::mipsel);
1892      else if (Target.getArch() == llvm::Triple::mips64)
1893        Target.setArch(llvm::Triple::mips64el);
1894      else if (Target.getArch() == llvm::Triple::aarch64_be)
1895        Target.setArch(llvm::Triple::aarch64);
1896      else if (Target.getArch() == llvm::Triple::arm64_be)
1897        Target.setArch(llvm::Triple::arm64);
1898    } else {
1899      if (Target.getArch() == llvm::Triple::mipsel)
1900        Target.setArch(llvm::Triple::mips);
1901      else if (Target.getArch() == llvm::Triple::mips64el)
1902        Target.setArch(llvm::Triple::mips64);
1903      else if (Target.getArch() == llvm::Triple::aarch64)
1904        Target.setArch(llvm::Triple::aarch64_be);
1905      else if (Target.getArch() == llvm::Triple::arm64)
1906        Target.setArch(llvm::Triple::arm64_be);
1907    }
1908  }
1909
1910  // Skip further flag support on OSes which don't support '-m32' or '-m64'.
1911  if (Target.getArchName() == "tce" ||
1912      Target.getOS() == llvm::Triple::AuroraUX ||
1913      Target.getOS() == llvm::Triple::Minix)
1914    return Target;
1915
1916  // Handle pseudo-target flags '-m64', '-m32' and '-m16'.
1917  if (Arg *A = Args.getLastArg(options::OPT_m64, options::OPT_m32,
1918                               options::OPT_m16)) {
1919    llvm::Triple::ArchType AT = llvm::Triple::UnknownArch;
1920
1921    if (A->getOption().matches(options::OPT_m64))
1922      AT = Target.get64BitArchVariant().getArch();
1923    else if (A->getOption().matches(options::OPT_m32))
1924      AT = Target.get32BitArchVariant().getArch();
1925    else if (A->getOption().matches(options::OPT_m16) &&
1926             Target.get32BitArchVariant().getArch() == llvm::Triple::x86) {
1927      AT = llvm::Triple::x86;
1928      Target.setEnvironment(llvm::Triple::CODE16);
1929    }
1930
1931    if (AT != llvm::Triple::UnknownArch)
1932      Target.setArch(AT);
1933  }
1934
1935  return Target;
1936}
1937
1938const ToolChain &Driver::getToolChain(const ArgList &Args,
1939                                      StringRef DarwinArchName) const {
1940  llvm::Triple Target = computeTargetTriple(DefaultTargetTriple, Args,
1941                                            DarwinArchName);
1942
1943  ToolChain *&TC = ToolChains[Target.str()];
1944  if (!TC) {
1945    switch (Target.getOS()) {
1946    case llvm::Triple::AuroraUX:
1947      TC = new toolchains::AuroraUX(*this, Target, Args);
1948      break;
1949    case llvm::Triple::Darwin:
1950    case llvm::Triple::MacOSX:
1951    case llvm::Triple::IOS:
1952      TC = new toolchains::DarwinClang(*this, Target, Args);
1953      break;
1954    case llvm::Triple::DragonFly:
1955      TC = new toolchains::DragonFly(*this, Target, Args);
1956      break;
1957    case llvm::Triple::OpenBSD:
1958      TC = new toolchains::OpenBSD(*this, Target, Args);
1959      break;
1960    case llvm::Triple::Bitrig:
1961      TC = new toolchains::Bitrig(*this, Target, Args);
1962      break;
1963    case llvm::Triple::NetBSD:
1964      TC = new toolchains::NetBSD(*this, Target, Args);
1965      break;
1966    case llvm::Triple::FreeBSD:
1967      TC = new toolchains::FreeBSD(*this, Target, Args);
1968      break;
1969    case llvm::Triple::Minix:
1970      TC = new toolchains::Minix(*this, Target, Args);
1971      break;
1972    case llvm::Triple::Linux:
1973      if (Target.getArch() == llvm::Triple::hexagon)
1974        TC = new toolchains::Hexagon_TC(*this, Target, Args);
1975      else
1976        TC = new toolchains::Linux(*this, Target, Args);
1977      break;
1978    case llvm::Triple::Solaris:
1979      TC = new toolchains::Solaris(*this, Target, Args);
1980      break;
1981    case llvm::Triple::Win32:
1982      switch (Target.getEnvironment()) {
1983      default:
1984        if (Target.isOSBinFormatELF())
1985          TC = new toolchains::Generic_ELF(*this, Target, Args);
1986        else if (Target.isOSBinFormatMachO())
1987          TC = new toolchains::MachO(*this, Target, Args);
1988        else
1989          TC = new toolchains::Generic_GCC(*this, Target, Args);
1990        break;
1991      case llvm::Triple::GNU:
1992        // FIXME: We need a MinGW toolchain.  Use the default Generic_GCC
1993        // toolchain for now as the default case would below otherwise.
1994        if (Target.isOSBinFormatELF())
1995          TC = new toolchains::Generic_ELF(*this, Target, Args);
1996        else
1997          TC = new toolchains::Generic_GCC(*this, Target, Args);
1998        break;
1999      case llvm::Triple::MSVC:
2000      case llvm::Triple::UnknownEnvironment:
2001        TC = new toolchains::Windows(*this, Target, Args);
2002        break;
2003      }
2004      break;
2005    default:
2006      // TCE is an OSless target
2007      if (Target.getArchName() == "tce") {
2008        TC = new toolchains::TCEToolChain(*this, Target, Args);
2009        break;
2010      }
2011      // If Hexagon is configured as an OSless target
2012      if (Target.getArch() == llvm::Triple::hexagon) {
2013        TC = new toolchains::Hexagon_TC(*this, Target, Args);
2014        break;
2015      }
2016      if (Target.getArch() == llvm::Triple::xcore) {
2017        TC = new toolchains::XCore(*this, Target, Args);
2018        break;
2019      }
2020      if (Target.isOSBinFormatELF()) {
2021        TC = new toolchains::Generic_ELF(*this, Target, Args);
2022        break;
2023      }
2024      if (Target.getObjectFormat() == llvm::Triple::MachO) {
2025        TC = new toolchains::MachO(*this, Target, Args);
2026        break;
2027      }
2028      TC = new toolchains::Generic_GCC(*this, Target, Args);
2029      break;
2030    }
2031  }
2032  return *TC;
2033}
2034
2035bool Driver::ShouldUseClangCompiler(const JobAction &JA) const {
2036  // Check if user requested no clang, or clang doesn't understand this type (we
2037  // only handle single inputs for now).
2038  if (JA.size() != 1 ||
2039      !types::isAcceptedByClang((*JA.begin())->getType()))
2040    return false;
2041
2042  // Otherwise make sure this is an action clang understands.
2043  if (!isa<PreprocessJobAction>(JA) && !isa<PrecompileJobAction>(JA) &&
2044      !isa<CompileJobAction>(JA))
2045    return false;
2046
2047  return true;
2048}
2049
2050/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
2051/// grouped values as integers. Numbers which are not provided are set to 0.
2052///
2053/// \return True if the entire string was parsed (9.2), or all groups were
2054/// parsed (10.3.5extrastuff).
2055bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
2056                               unsigned &Minor, unsigned &Micro,
2057                               bool &HadExtra) {
2058  HadExtra = false;
2059
2060  Major = Minor = Micro = 0;
2061  if (*Str == '\0')
2062    return true;
2063
2064  char *End;
2065  Major = (unsigned) strtol(Str, &End, 10);
2066  if (*Str != '\0' && *End == '\0')
2067    return true;
2068  if (*End != '.')
2069    return false;
2070
2071  Str = End+1;
2072  Minor = (unsigned) strtol(Str, &End, 10);
2073  if (*Str != '\0' && *End == '\0')
2074    return true;
2075  if (*End != '.')
2076    return false;
2077
2078  Str = End+1;
2079  Micro = (unsigned) strtol(Str, &End, 10);
2080  if (*Str != '\0' && *End == '\0')
2081    return true;
2082  if (Str == End)
2083    return false;
2084  HadExtra = true;
2085  return true;
2086}
2087
2088std::pair<unsigned, unsigned> Driver::getIncludeExcludeOptionFlagMasks() const {
2089  unsigned IncludedFlagsBitmask = 0;
2090  unsigned ExcludedFlagsBitmask = options::NoDriverOption;
2091
2092  if (Mode == CLMode) {
2093    // Include CL and Core options.
2094    IncludedFlagsBitmask |= options::CLOption;
2095    IncludedFlagsBitmask |= options::CoreOption;
2096  } else {
2097    ExcludedFlagsBitmask |= options::CLOption;
2098  }
2099
2100  return std::make_pair(IncludedFlagsBitmask, ExcludedFlagsBitmask);
2101}
2102
2103bool clang::driver::isOptimizationLevelFast(const llvm::opt::ArgList &Args) {
2104  return Args.hasFlag(options::OPT_Ofast, options::OPT_O_Group, false);
2105}
2106