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// This is the entry point to the clang driver; it is a thin wrapper
11// for functionality in the Driver clang library.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/Basic/CharInfo.h"
16#include "clang/Basic/DiagnosticOptions.h"
17#include "clang/Driver/Compilation.h"
18#include "clang/Driver/Driver.h"
19#include "clang/Driver/DriverDiagnostic.h"
20#include "clang/Driver/Options.h"
21#include "clang/Frontend/CompilerInvocation.h"
22#include "clang/Frontend/TextDiagnosticPrinter.h"
23#include "clang/Frontend/Utils.h"
24#include "llvm/ADT/ArrayRef.h"
25#include "llvm/ADT/OwningPtr.h"
26#include "llvm/ADT/SmallString.h"
27#include "llvm/ADT/SmallVector.h"
28#include "llvm/ADT/STLExtras.h"
29#include "llvm/Option/ArgList.h"
30#include "llvm/Option/OptTable.h"
31#include "llvm/Option/Option.h"
32#include "llvm/Support/CommandLine.h"
33#include "llvm/Support/ErrorHandling.h"
34#include "llvm/Support/FileSystem.h"
35#include "llvm/Support/Host.h"
36#include "llvm/Support/ManagedStatic.h"
37#include "llvm/Support/MemoryBuffer.h"
38#include "llvm/Support/Path.h"
39#include "llvm/Support/PrettyStackTrace.h"
40#include "llvm/Support/Process.h"
41#include "llvm/Support/Program.h"
42#include "llvm/Support/Regex.h"
43#include "llvm/Support/Signals.h"
44#include "llvm/Support/TargetRegistry.h"
45#include "llvm/Support/TargetSelect.h"
46#include "llvm/Support/Timer.h"
47#include "llvm/Support/raw_ostream.h"
48#include "llvm/Support/system_error.h"
49using namespace clang;
50using namespace clang::driver;
51using namespace llvm::opt;
52
53std::string GetExecutablePath(const char *Argv0, bool CanonicalPrefixes) {
54  if (!CanonicalPrefixes)
55    return Argv0;
56
57  // This just needs to be some symbol in the binary; C++ doesn't
58  // allow taking the address of ::main however.
59  void *P = (void*) (intptr_t) GetExecutablePath;
60  return llvm::sys::fs::getMainExecutable(Argv0, P);
61}
62
63static const char *SaveStringInSet(std::set<std::string> &SavedStrings,
64                                   StringRef S) {
65  return SavedStrings.insert(S).first->c_str();
66}
67
68/// ApplyQAOverride - Apply a list of edits to the input argument lists.
69///
70/// The input string is a space separate list of edits to perform,
71/// they are applied in order to the input argument lists. Edits
72/// should be one of the following forms:
73///
74///  '#': Silence information about the changes to the command line arguments.
75///
76///  '^': Add FOO as a new argument at the beginning of the command line.
77///
78///  '+': Add FOO as a new argument at the end of the command line.
79///
80///  's/XXX/YYY/': Substitute the regular expression XXX with YYY in the command
81///  line.
82///
83///  'xOPTION': Removes all instances of the literal argument OPTION.
84///
85///  'XOPTION': Removes all instances of the literal argument OPTION,
86///  and the following argument.
87///
88///  'Ox': Removes all flags matching 'O' or 'O[sz0-9]' and adds 'Ox'
89///  at the end of the command line.
90///
91/// \param OS - The stream to write edit information to.
92/// \param Args - The vector of command line arguments.
93/// \param Edit - The override command to perform.
94/// \param SavedStrings - Set to use for storing string representations.
95static void ApplyOneQAOverride(raw_ostream &OS,
96                               SmallVectorImpl<const char*> &Args,
97                               StringRef Edit,
98                               std::set<std::string> &SavedStrings) {
99  // This does not need to be efficient.
100
101  if (Edit[0] == '^') {
102    const char *Str =
103      SaveStringInSet(SavedStrings, Edit.substr(1));
104    OS << "### Adding argument " << Str << " at beginning\n";
105    Args.insert(Args.begin() + 1, Str);
106  } else if (Edit[0] == '+') {
107    const char *Str =
108      SaveStringInSet(SavedStrings, Edit.substr(1));
109    OS << "### Adding argument " << Str << " at end\n";
110    Args.push_back(Str);
111  } else if (Edit[0] == 's' && Edit[1] == '/' && Edit.endswith("/") &&
112             Edit.slice(2, Edit.size()-1).find('/') != StringRef::npos) {
113    StringRef MatchPattern = Edit.substr(2).split('/').first;
114    StringRef ReplPattern = Edit.substr(2).split('/').second;
115    ReplPattern = ReplPattern.slice(0, ReplPattern.size()-1);
116
117    for (unsigned i = 1, e = Args.size(); i != e; ++i) {
118      std::string Repl = llvm::Regex(MatchPattern).sub(ReplPattern, Args[i]);
119
120      if (Repl != Args[i]) {
121        OS << "### Replacing '" << Args[i] << "' with '" << Repl << "'\n";
122        Args[i] = SaveStringInSet(SavedStrings, Repl);
123      }
124    }
125  } else if (Edit[0] == 'x' || Edit[0] == 'X') {
126    std::string Option = Edit.substr(1, std::string::npos);
127    for (unsigned i = 1; i < Args.size();) {
128      if (Option == Args[i]) {
129        OS << "### Deleting argument " << Args[i] << '\n';
130        Args.erase(Args.begin() + i);
131        if (Edit[0] == 'X') {
132          if (i < Args.size()) {
133            OS << "### Deleting argument " << Args[i] << '\n';
134            Args.erase(Args.begin() + i);
135          } else
136            OS << "### Invalid X edit, end of command line!\n";
137        }
138      } else
139        ++i;
140    }
141  } else if (Edit[0] == 'O') {
142    for (unsigned i = 1; i < Args.size();) {
143      const char *A = Args[i];
144      if (A[0] == '-' && A[1] == 'O' &&
145          (A[2] == '\0' ||
146           (A[3] == '\0' && (A[2] == 's' || A[2] == 'z' ||
147                             ('0' <= A[2] && A[2] <= '9'))))) {
148        OS << "### Deleting argument " << Args[i] << '\n';
149        Args.erase(Args.begin() + i);
150      } else
151        ++i;
152    }
153    OS << "### Adding argument " << Edit << " at end\n";
154    Args.push_back(SaveStringInSet(SavedStrings, '-' + Edit.str()));
155  } else {
156    OS << "### Unrecognized edit: " << Edit << "\n";
157  }
158}
159
160/// ApplyQAOverride - Apply a comma separate list of edits to the
161/// input argument lists. See ApplyOneQAOverride.
162static void ApplyQAOverride(SmallVectorImpl<const char*> &Args,
163                            const char *OverrideStr,
164                            std::set<std::string> &SavedStrings) {
165  raw_ostream *OS = &llvm::errs();
166
167  if (OverrideStr[0] == '#') {
168    ++OverrideStr;
169    OS = &llvm::nulls();
170  }
171
172  *OS << "### QA_OVERRIDE_GCC3_OPTIONS: " << OverrideStr << "\n";
173
174  // This does not need to be efficient.
175
176  const char *S = OverrideStr;
177  while (*S) {
178    const char *End = ::strchr(S, ' ');
179    if (!End)
180      End = S + strlen(S);
181    if (End != S)
182      ApplyOneQAOverride(*OS, Args, std::string(S, End), SavedStrings);
183    S = End;
184    if (*S != '\0')
185      ++S;
186  }
187}
188
189extern int cc1_main(const char **ArgBegin, const char **ArgEnd,
190                    const char *Argv0, void *MainAddr);
191extern int cc1as_main(const char **ArgBegin, const char **ArgEnd,
192                      const char *Argv0, void *MainAddr);
193
194static void ParseProgName(SmallVectorImpl<const char *> &ArgVector,
195                          std::set<std::string> &SavedStrings,
196                          Driver &TheDriver)
197{
198  // Try to infer frontend type and default target from the program name.
199
200  // suffixes[] contains the list of known driver suffixes.
201  // Suffixes are compared against the program name in order.
202  // If there is a match, the frontend type is updated as necessary (CPP/C++).
203  // If there is no match, a second round is done after stripping the last
204  // hyphen and everything following it. This allows using something like
205  // "clang++-2.9".
206
207  // If there is a match in either the first or second round,
208  // the function tries to identify a target as prefix. E.g.
209  // "x86_64-linux-clang" as interpreted as suffix "clang" with
210  // target prefix "x86_64-linux". If such a target prefix is found,
211  // is gets added via -target as implicit first argument.
212  static const struct {
213    const char *Suffix;
214    const char *ModeFlag;
215  } suffixes [] = {
216    { "clang",     0 },
217    { "clang++",   "--driver-mode=g++" },
218    { "clang-CC",  "--driver-mode=g++" },
219    { "clang-c++", "--driver-mode=g++" },
220    { "clang-cc",  0 },
221    { "clang-cpp", "--driver-mode=cpp" },
222    { "clang-g++", "--driver-mode=g++" },
223    { "clang-gcc", 0 },
224    { "clang-cl",  "--driver-mode=cl"  },
225    { "CC",        "--driver-mode=g++" },
226    { "cc",        0 },
227    { "cpp",       "--driver-mode=cpp" },
228    { "cl" ,       "--driver-mode=cl"  },
229    { "++",        "--driver-mode=g++" },
230  };
231  std::string ProgName(llvm::sys::path::stem(ArgVector[0]));
232#ifdef _WIN32
233  std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(),
234                 toLowercase);
235#endif
236  StringRef ProgNameRef(ProgName);
237  StringRef Prefix;
238
239  for (int Components = 2; Components; --Components) {
240    bool FoundMatch = false;
241    size_t i;
242
243    for (i = 0; i < sizeof(suffixes) / sizeof(suffixes[0]); ++i) {
244      if (ProgNameRef.endswith(suffixes[i].Suffix)) {
245        FoundMatch = true;
246        SmallVectorImpl<const char *>::iterator it = ArgVector.begin();
247        if (it != ArgVector.end())
248          ++it;
249        if (suffixes[i].ModeFlag)
250          ArgVector.insert(it, suffixes[i].ModeFlag);
251        break;
252      }
253    }
254
255    if (FoundMatch) {
256      StringRef::size_type LastComponent = ProgNameRef.rfind('-',
257        ProgNameRef.size() - strlen(suffixes[i].Suffix));
258      if (LastComponent != StringRef::npos)
259        Prefix = ProgNameRef.slice(0, LastComponent);
260      break;
261    }
262
263    StringRef::size_type LastComponent = ProgNameRef.rfind('-');
264    if (LastComponent == StringRef::npos)
265      break;
266    ProgNameRef = ProgNameRef.slice(0, LastComponent);
267  }
268
269  if (Prefix.empty())
270    return;
271
272  std::string IgnoredError;
273  if (llvm::TargetRegistry::lookupTarget(Prefix, IgnoredError)) {
274    SmallVectorImpl<const char *>::iterator it = ArgVector.begin();
275    if (it != ArgVector.end())
276      ++it;
277    const char* Strings[] =
278      { SaveStringInSet(SavedStrings, std::string("-target")),
279        SaveStringInSet(SavedStrings, Prefix) };
280    ArgVector.insert(it, Strings, Strings + llvm::array_lengthof(Strings));
281  }
282}
283
284namespace {
285  class StringSetSaver : public llvm::cl::StringSaver {
286  public:
287    StringSetSaver(std::set<std::string> &Storage) : Storage(Storage) {}
288    const char *SaveString(const char *Str) LLVM_OVERRIDE {
289      return SaveStringInSet(Storage, Str);
290    }
291  private:
292    std::set<std::string> &Storage;
293  };
294}
295
296int main(int argc_, const char **argv_) {
297  llvm::sys::PrintStackTraceOnErrorSignal();
298  llvm::PrettyStackTraceProgram X(argc_, argv_);
299
300  SmallVector<const char *, 256> argv;
301  llvm::SpecificBumpPtrAllocator<char> ArgAllocator;
302  llvm::error_code EC = llvm::sys::Process::GetArgumentVector(
303      argv, llvm::ArrayRef<const char *>(argv_, argc_), ArgAllocator);
304  if (EC) {
305    llvm::errs() << "error: couldn't get arguments: " << EC.message() << '\n';
306    return 1;
307  }
308
309  std::set<std::string> SavedStrings;
310  StringSetSaver Saver(SavedStrings);
311  llvm::cl::ExpandResponseFiles(Saver, llvm::cl::TokenizeGNUCommandLine, argv);
312
313  // Handle -cc1 integrated tools.
314  if (argv.size() > 1 && StringRef(argv[1]).startswith("-cc1")) {
315    StringRef Tool = argv[1] + 4;
316
317    if (Tool == "")
318      return cc1_main(argv.data()+2, argv.data()+argv.size(), argv[0],
319                      (void*) (intptr_t) GetExecutablePath);
320    if (Tool == "as")
321      return cc1as_main(argv.data()+2, argv.data()+argv.size(), argv[0],
322                      (void*) (intptr_t) GetExecutablePath);
323
324    // Reject unknown tools.
325    llvm::errs() << "error: unknown integrated tool '" << Tool << "'\n";
326    return 1;
327  }
328
329  bool CanonicalPrefixes = true;
330  for (int i = 1, size = argv.size(); i < size; ++i) {
331    if (StringRef(argv[i]) == "-no-canonical-prefixes") {
332      CanonicalPrefixes = false;
333      break;
334    }
335  }
336
337  // Handle QA_OVERRIDE_GCC3_OPTIONS and CCC_ADD_ARGS, used for editing a
338  // command line behind the scenes.
339  if (const char *OverrideStr = ::getenv("QA_OVERRIDE_GCC3_OPTIONS")) {
340    // FIXME: Driver shouldn't take extra initial argument.
341    ApplyQAOverride(argv, OverrideStr, SavedStrings);
342  }
343
344  std::string Path = GetExecutablePath(argv[0], CanonicalPrefixes);
345
346  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions;
347  {
348    OwningPtr<OptTable> Opts(createDriverOptTable());
349    unsigned MissingArgIndex, MissingArgCount;
350    OwningPtr<InputArgList> Args(Opts->ParseArgs(argv.begin()+1, argv.end(),
351                                                 MissingArgIndex,
352                                                 MissingArgCount));
353    // We ignore MissingArgCount and the return value of ParseDiagnosticArgs.
354    // Any errors that would be diagnosed here will also be diagnosed later,
355    // when the DiagnosticsEngine actually exists.
356    (void) ParseDiagnosticArgs(*DiagOpts, *Args);
357  }
358  // Now we can create the DiagnosticsEngine with a properly-filled-out
359  // DiagnosticOptions instance.
360  TextDiagnosticPrinter *DiagClient
361    = new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
362
363  // If the clang binary happens to be named cl.exe for compatibility reasons,
364  // use clang-cl.exe as the prefix to avoid confusion between clang and MSVC.
365  StringRef ExeBasename(llvm::sys::path::filename(Path));
366  if (ExeBasename.equals_lower("cl.exe"))
367    ExeBasename = "clang-cl.exe";
368  DiagClient->setPrefix(ExeBasename);
369
370  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
371
372  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
373  ProcessWarningOptions(Diags, *DiagOpts, /*ReportDiags=*/false);
374
375  Driver TheDriver(Path, llvm::sys::getDefaultTargetTriple(), "a.out", Diags);
376
377  // Attempt to find the original path used to invoke the driver, to determine
378  // the installed path. We do this manually, because we want to support that
379  // path being a symlink.
380  {
381    SmallString<128> InstalledPath(argv[0]);
382
383    // Do a PATH lookup, if there are no directory components.
384    if (llvm::sys::path::filename(InstalledPath) == InstalledPath) {
385      std::string Tmp = llvm::sys::FindProgramByName(
386        llvm::sys::path::filename(InstalledPath.str()));
387      if (!Tmp.empty())
388        InstalledPath = Tmp;
389    }
390    llvm::sys::fs::make_absolute(InstalledPath);
391    InstalledPath = llvm::sys::path::parent_path(InstalledPath);
392    bool exists;
393    if (!llvm::sys::fs::exists(InstalledPath.str(), exists) && exists)
394      TheDriver.setInstalledDir(InstalledPath);
395  }
396
397  llvm::InitializeAllTargets();
398  ParseProgName(argv, SavedStrings, TheDriver);
399
400  // Handle CC_PRINT_OPTIONS and CC_PRINT_OPTIONS_FILE.
401  TheDriver.CCPrintOptions = !!::getenv("CC_PRINT_OPTIONS");
402  if (TheDriver.CCPrintOptions)
403    TheDriver.CCPrintOptionsFilename = ::getenv("CC_PRINT_OPTIONS_FILE");
404
405  // Handle CC_PRINT_HEADERS and CC_PRINT_HEADERS_FILE.
406  TheDriver.CCPrintHeaders = !!::getenv("CC_PRINT_HEADERS");
407  if (TheDriver.CCPrintHeaders)
408    TheDriver.CCPrintHeadersFilename = ::getenv("CC_PRINT_HEADERS_FILE");
409
410  // Handle CC_LOG_DIAGNOSTICS and CC_LOG_DIAGNOSTICS_FILE.
411  TheDriver.CCLogDiagnostics = !!::getenv("CC_LOG_DIAGNOSTICS");
412  if (TheDriver.CCLogDiagnostics)
413    TheDriver.CCLogDiagnosticsFilename = ::getenv("CC_LOG_DIAGNOSTICS_FILE");
414
415  OwningPtr<Compilation> C(TheDriver.BuildCompilation(argv));
416  int Res = 0;
417  SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
418  if (C.get())
419    Res = TheDriver.ExecuteCompilation(*C, FailingCommands);
420
421  // Force a crash to test the diagnostics.
422  if (::getenv("FORCE_CLANG_DIAGNOSTICS_CRASH")) {
423    Diags.Report(diag::err_drv_force_crash) << "FORCE_CLANG_DIAGNOSTICS_CRASH";
424    const Command *FailingCommand = 0;
425    FailingCommands.push_back(std::make_pair(-1, FailingCommand));
426  }
427
428  for (SmallVectorImpl< std::pair<int, const Command *> >::iterator it =
429         FailingCommands.begin(), ie = FailingCommands.end(); it != ie; ++it) {
430    int CommandRes = it->first;
431    const Command *FailingCommand = it->second;
432    if (!Res)
433      Res = CommandRes;
434
435    // If result status is < 0, then the driver command signalled an error.
436    // If result status is 70, then the driver command reported a fatal error.
437    // In these cases, generate additional diagnostic information if possible.
438    if (CommandRes < 0 || CommandRes == 70) {
439      TheDriver.generateCompilationDiagnostics(*C, FailingCommand);
440      break;
441    }
442  }
443
444  // If any timers were active but haven't been destroyed yet, print their
445  // results now.  This happens in -disable-free mode.
446  llvm::TimerGroup::printAll(llvm::errs());
447
448  llvm::llvm_shutdown();
449
450#ifdef _WIN32
451  // Exit status should not be negative on Win32, unless abnormal termination.
452  // Once abnormal termiation was caught, negative status should not be
453  // propagated.
454  if (Res < 0)
455    Res = 1;
456#endif
457
458  // If we have multiple failing commands, we return the result of the first
459  // failing command.
460  return Res;
461}
462