1 //===-- driver.cpp - Clang GCC-Compatible Driver --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is the entry point to the clang driver; it is a thin wrapper
11 // for functionality in the Driver clang library.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Basic/DiagnosticOptions.h"
16 #include "clang/Driver/Compilation.h"
17 #include "clang/Driver/Driver.h"
18 #include "clang/Driver/DriverDiagnostic.h"
19 #include "clang/Driver/Options.h"
20 #include "clang/Driver/ToolChain.h"
21 #include "clang/Frontend/ChainedDiagnosticConsumer.h"
22 #include "clang/Frontend/CompilerInvocation.h"
23 #include "clang/Frontend/SerializedDiagnosticPrinter.h"
24 #include "clang/Frontend/TextDiagnosticPrinter.h"
25 #include "clang/Frontend/Utils.h"
26 #include "llvm/ADT/ArrayRef.h"
27 #include "llvm/ADT/SmallString.h"
28 #include "llvm/ADT/SmallVector.h"
29 #include "llvm/Config/llvm-config.h"
30 #include "llvm/Option/ArgList.h"
31 #include "llvm/Option/OptTable.h"
32 #include "llvm/Option/Option.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/FileSystem.h"
36 #include "llvm/Support/Host.h"
37 #include "llvm/Support/ManagedStatic.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/StringSaver.h"
45 #include "llvm/Support/TargetSelect.h"
46 #include "llvm/Support/Timer.h"
47 #include "llvm/Support/raw_ostream.h"
50 #include <system_error>
51 using namespace clang;
52 using namespace clang::driver;
53 using namespace llvm::opt;
55 std::string GetExecutablePath(const char *Argv0, bool CanonicalPrefixes) {
56 if (!CanonicalPrefixes)
59 // This just needs to be some symbol in the binary; C++ doesn't
60 // allow taking the address of ::main however.
61 void *P = (void*) (intptr_t) GetExecutablePath;
62 return llvm::sys::fs::getMainExecutable(Argv0, P);
65 static const char *GetStableCStr(std::set<std::string> &SavedStrings,
67 return SavedStrings.insert(S).first->c_str();
70 /// ApplyQAOverride - Apply a list of edits to the input argument lists.
72 /// The input string is a space separate list of edits to perform,
73 /// they are applied in order to the input argument lists. Edits
74 /// should be one of the following forms:
76 /// '#': Silence information about the changes to the command line arguments.
78 /// '^': Add FOO as a new argument at the beginning of the command line.
80 /// '+': Add FOO as a new argument at the end of the command line.
82 /// 's/XXX/YYY/': Substitute the regular expression XXX with YYY in the command
85 /// 'xOPTION': Removes all instances of the literal argument OPTION.
87 /// 'XOPTION': Removes all instances of the literal argument OPTION,
88 /// and the following argument.
90 /// 'Ox': Removes all flags matching 'O' or 'O[sz0-9]' and adds 'Ox'
91 /// at the end of the command line.
93 /// \param OS - The stream to write edit information to.
94 /// \param Args - The vector of command line arguments.
95 /// \param Edit - The override command to perform.
96 /// \param SavedStrings - Set to use for storing string representations.
97 static void ApplyOneQAOverride(raw_ostream &OS,
98 SmallVectorImpl<const char*> &Args,
100 std::set<std::string> &SavedStrings) {
101 // This does not need to be efficient.
103 if (Edit[0] == '^') {
105 GetStableCStr(SavedStrings, Edit.substr(1));
106 OS << "### Adding argument " << Str << " at beginning\n";
107 Args.insert(Args.begin() + 1, Str);
108 } else if (Edit[0] == '+') {
110 GetStableCStr(SavedStrings, Edit.substr(1));
111 OS << "### Adding argument " << Str << " at end\n";
113 } else if (Edit[0] == 's' && Edit[1] == '/' && Edit.endswith("/") &&
114 Edit.slice(2, Edit.size()-1).find('/') != StringRef::npos) {
115 StringRef MatchPattern = Edit.substr(2).split('/').first;
116 StringRef ReplPattern = Edit.substr(2).split('/').second;
117 ReplPattern = ReplPattern.slice(0, ReplPattern.size()-1);
119 for (unsigned i = 1, e = Args.size(); i != e; ++i) {
120 // Ignore end-of-line response file markers
121 if (Args[i] == nullptr)
123 std::string Repl = llvm::Regex(MatchPattern).sub(ReplPattern, Args[i]);
125 if (Repl != Args[i]) {
126 OS << "### Replacing '" << Args[i] << "' with '" << Repl << "'\n";
127 Args[i] = GetStableCStr(SavedStrings, Repl);
130 } else if (Edit[0] == 'x' || Edit[0] == 'X') {
131 auto Option = Edit.substr(1);
132 for (unsigned i = 1; i < Args.size();) {
133 if (Option == Args[i]) {
134 OS << "### Deleting argument " << Args[i] << '\n';
135 Args.erase(Args.begin() + i);
136 if (Edit[0] == 'X') {
137 if (i < Args.size()) {
138 OS << "### Deleting argument " << Args[i] << '\n';
139 Args.erase(Args.begin() + i);
141 OS << "### Invalid X edit, end of command line!\n";
146 } else if (Edit[0] == 'O') {
147 for (unsigned i = 1; i < Args.size();) {
148 const char *A = Args[i];
149 // Ignore end-of-line response file markers
152 if (A[0] == '-' && A[1] == 'O' &&
154 (A[3] == '\0' && (A[2] == 's' || A[2] == 'z' ||
155 ('0' <= A[2] && A[2] <= '9'))))) {
156 OS << "### Deleting argument " << Args[i] << '\n';
157 Args.erase(Args.begin() + i);
161 OS << "### Adding argument " << Edit << " at end\n";
162 Args.push_back(GetStableCStr(SavedStrings, '-' + Edit.str()));
164 OS << "### Unrecognized edit: " << Edit << "\n";
168 /// ApplyQAOverride - Apply a comma separate list of edits to the
169 /// input argument lists. See ApplyOneQAOverride.
170 static void ApplyQAOverride(SmallVectorImpl<const char*> &Args,
171 const char *OverrideStr,
172 std::set<std::string> &SavedStrings) {
173 raw_ostream *OS = &llvm::errs();
175 if (OverrideStr[0] == '#') {
180 *OS << "### CCC_OVERRIDE_OPTIONS: " << OverrideStr << "\n";
182 // This does not need to be efficient.
184 const char *S = OverrideStr;
186 const char *End = ::strchr(S, ' ');
190 ApplyOneQAOverride(*OS, Args, std::string(S, End), SavedStrings);
197 extern int cc1_main(ArrayRef<const char *> Argv, const char *Argv0,
199 extern int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0,
202 static void insertTargetAndModeArgs(StringRef Target, StringRef Mode,
203 SmallVectorImpl<const char *> &ArgVector,
204 std::set<std::string> &SavedStrings) {
206 // Add the mode flag to the arguments.
207 auto it = ArgVector.begin();
208 if (it != ArgVector.end())
210 ArgVector.insert(it, GetStableCStr(SavedStrings, Mode));
213 if (!Target.empty()) {
214 auto it = ArgVector.begin();
215 if (it != ArgVector.end())
217 const char *arr[] = {"-target", GetStableCStr(SavedStrings, Target)};
218 ArgVector.insert(it, std::begin(arr), std::end(arr));
222 static void getCLEnvVarOptions(std::string &EnvValue, llvm::StringSaver &Saver,
223 SmallVectorImpl<const char *> &Opts) {
224 llvm::cl::TokenizeWindowsCommandLine(EnvValue, Saver, Opts);
225 // The first instance of '#' should be replaced with '=' in each option.
226 for (const char *Opt : Opts)
227 if (char *NumberSignPtr = const_cast<char *>(::strchr(Opt, '#')))
228 *NumberSignPtr = '=';
231 static void SetBackdoorDriverOutputsFromEnvVars(Driver &TheDriver) {
232 // Handle CC_PRINT_OPTIONS and CC_PRINT_OPTIONS_FILE.
233 TheDriver.CCPrintOptions = !!::getenv("CC_PRINT_OPTIONS");
234 if (TheDriver.CCPrintOptions)
235 TheDriver.CCPrintOptionsFilename = ::getenv("CC_PRINT_OPTIONS_FILE");
237 // Handle CC_PRINT_HEADERS and CC_PRINT_HEADERS_FILE.
238 TheDriver.CCPrintHeaders = !!::getenv("CC_PRINT_HEADERS");
239 if (TheDriver.CCPrintHeaders)
240 TheDriver.CCPrintHeadersFilename = ::getenv("CC_PRINT_HEADERS_FILE");
242 // Handle CC_LOG_DIAGNOSTICS and CC_LOG_DIAGNOSTICS_FILE.
243 TheDriver.CCLogDiagnostics = !!::getenv("CC_LOG_DIAGNOSTICS");
244 if (TheDriver.CCLogDiagnostics)
245 TheDriver.CCLogDiagnosticsFilename = ::getenv("CC_LOG_DIAGNOSTICS_FILE");
248 static void FixupDiagPrefixExeName(TextDiagnosticPrinter *DiagClient,
249 const std::string &Path) {
250 // If the clang binary happens to be named cl.exe for compatibility reasons,
251 // use clang-cl.exe as the prefix to avoid confusion between clang and MSVC.
252 StringRef ExeBasename(llvm::sys::path::filename(Path));
253 if (ExeBasename.equals_lower("cl.exe"))
254 ExeBasename = "clang-cl.exe";
255 DiagClient->setPrefix(ExeBasename);
258 // This lets us create the DiagnosticsEngine with a properly-filled-out
259 // DiagnosticOptions instance.
260 static DiagnosticOptions *
261 CreateAndPopulateDiagOpts(ArrayRef<const char *> argv) {
262 auto *DiagOpts = new DiagnosticOptions;
263 std::unique_ptr<OptTable> Opts(createDriverOptTable());
264 unsigned MissingArgIndex, MissingArgCount;
266 Opts->ParseArgs(argv.slice(1), MissingArgIndex, MissingArgCount);
267 // We ignore MissingArgCount and the return value of ParseDiagnosticArgs.
268 // Any errors that would be diagnosed here will also be diagnosed later,
269 // when the DiagnosticsEngine actually exists.
270 (void)ParseDiagnosticArgs(*DiagOpts, Args);
274 static void SetInstallDir(SmallVectorImpl<const char *> &argv,
275 Driver &TheDriver, bool CanonicalPrefixes) {
276 // Attempt to find the original path used to invoke the driver, to determine
277 // the installed path. We do this manually, because we want to support that
278 // path being a symlink.
279 SmallString<128> InstalledPath(argv[0]);
281 // Do a PATH lookup, if there are no directory components.
282 if (llvm::sys::path::filename(InstalledPath) == InstalledPath)
283 if (llvm::ErrorOr<std::string> Tmp = llvm::sys::findProgramByName(
284 llvm::sys::path::filename(InstalledPath.str())))
285 InstalledPath = *Tmp;
287 // FIXME: We don't actually canonicalize this, we just make it absolute.
288 if (CanonicalPrefixes)
289 llvm::sys::fs::make_absolute(InstalledPath);
291 StringRef InstalledPathParent(llvm::sys::path::parent_path(InstalledPath));
292 if (llvm::sys::fs::exists(InstalledPathParent))
293 TheDriver.setInstalledDir(InstalledPathParent);
296 static int ExecuteCC1Tool(ArrayRef<const char *> argv, StringRef Tool) {
297 void *GetExecutablePathVP = (void *)(intptr_t) GetExecutablePath;
299 return cc1_main(argv.slice(2), argv[0], GetExecutablePathVP);
301 return cc1as_main(argv.slice(2), argv[0], GetExecutablePathVP);
303 // Reject unknown tools.
304 llvm::errs() << "error: unknown integrated tool '" << Tool << "'\n";
308 int main(int argc_, const char **argv_) {
309 llvm::sys::PrintStackTraceOnErrorSignal(argv_[0]);
310 llvm::PrettyStackTraceProgram X(argc_, argv_);
311 llvm::llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
313 if (llvm::sys::Process::FixupStandardFileDescriptors())
316 SmallVector<const char *, 256> argv;
317 llvm::SpecificBumpPtrAllocator<char> ArgAllocator;
318 std::error_code EC = llvm::sys::Process::GetArgumentVector(
319 argv, llvm::makeArrayRef(argv_, argc_), ArgAllocator);
321 llvm::errs() << "error: couldn't get arguments: " << EC.message() << '\n';
325 llvm::InitializeAllTargets();
326 std::string ProgName = argv[0];
327 std::pair<std::string, std::string> TargetAndMode =
328 ToolChain::getTargetAndModeFromProgramName(ProgName);
330 llvm::BumpPtrAllocator A;
331 llvm::StringSaver Saver(A);
333 // Parse response files using the GNU syntax, unless we're in CL mode. There
334 // are two ways to put clang in CL compatibility mode: argv[0] is either
335 // clang-cl or cl, or --driver-mode=cl is on the command line. The normal
336 // command line parsing can't happen until after response file parsing, so we
337 // have to manually search for a --driver-mode=cl argument the hard way.
338 // Finally, our -cc1 tools don't care which tokenization mode we use because
339 // response files written by clang will tokenize the same way in either mode.
340 bool ClangCLMode = false;
341 if (TargetAndMode.second == "--driver-mode=cl" ||
342 std::find_if(argv.begin(), argv.end(), [](const char *F) {
343 return F && strcmp(F, "--driver-mode=cl") == 0;
347 enum { Default, POSIX, Windows } RSPQuoting = Default;
348 for (const char *F : argv) {
349 if (strcmp(F, "--rsp-quoting=posix") == 0)
351 else if (strcmp(F, "--rsp-quoting=windows") == 0)
352 RSPQuoting = Windows;
355 // Determines whether we want nullptr markers in argv to indicate response
356 // files end-of-lines. We only use this for the /LINK driver argument with
357 // clang-cl.exe on Windows.
358 bool MarkEOLs = ClangCLMode;
360 llvm::cl::TokenizerCallback Tokenizer;
361 if (RSPQuoting == Windows || (RSPQuoting == Default && ClangCLMode))
362 Tokenizer = &llvm::cl::TokenizeWindowsCommandLine;
364 Tokenizer = &llvm::cl::TokenizeGNUCommandLine;
366 if (MarkEOLs && argv.size() > 1 && StringRef(argv[1]).startswith("-cc1"))
368 llvm::cl::ExpandResponseFiles(Saver, Tokenizer, argv, MarkEOLs);
370 // Handle -cc1 integrated tools, even if -cc1 was expanded from a response
372 auto FirstArg = std::find_if(argv.begin() + 1, argv.end(),
373 [](const char *A) { return A != nullptr; });
374 if (FirstArg != argv.end() && StringRef(*FirstArg).startswith("-cc1")) {
375 // If -cc1 came from a response file, remove the EOL sentinels.
377 auto newEnd = std::remove(argv.begin(), argv.end(), nullptr);
378 argv.resize(newEnd - argv.begin());
380 return ExecuteCC1Tool(argv, argv[1] + 4);
383 bool CanonicalPrefixes = true;
384 for (int i = 1, size = argv.size(); i < size; ++i) {
385 // Skip end-of-line response file markers
386 if (argv[i] == nullptr)
388 if (StringRef(argv[i]) == "-no-canonical-prefixes") {
389 CanonicalPrefixes = false;
394 // Handle CL and _CL_ which permits additional command line options to be
395 // prepended or appended.
397 // Arguments in "CL" are prepended.
398 llvm::Optional<std::string> OptCL = llvm::sys::Process::GetEnv("CL");
399 if (OptCL.hasValue()) {
400 SmallVector<const char *, 8> PrependedOpts;
401 getCLEnvVarOptions(OptCL.getValue(), Saver, PrependedOpts);
403 // Insert right after the program name to prepend to the argument list.
404 argv.insert(argv.begin() + 1, PrependedOpts.begin(), PrependedOpts.end());
406 // Arguments in "_CL_" are appended.
407 llvm::Optional<std::string> Opt_CL_ = llvm::sys::Process::GetEnv("_CL_");
408 if (Opt_CL_.hasValue()) {
409 SmallVector<const char *, 8> AppendedOpts;
410 getCLEnvVarOptions(Opt_CL_.getValue(), Saver, AppendedOpts);
412 // Insert at the end of the argument list to append.
413 argv.append(AppendedOpts.begin(), AppendedOpts.end());
417 std::set<std::string> SavedStrings;
418 // Handle CCC_OVERRIDE_OPTIONS, used for editing a command line behind the
420 if (const char *OverrideStr = ::getenv("CCC_OVERRIDE_OPTIONS")) {
421 // FIXME: Driver shouldn't take extra initial argument.
422 ApplyQAOverride(argv, OverrideStr, SavedStrings);
425 std::string Path = GetExecutablePath(argv[0], CanonicalPrefixes);
427 IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts =
428 CreateAndPopulateDiagOpts(argv);
430 TextDiagnosticPrinter *DiagClient
431 = new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
432 FixupDiagPrefixExeName(DiagClient, Path);
434 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
436 DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
438 if (!DiagOpts->DiagnosticSerializationFile.empty()) {
439 auto SerializedConsumer =
440 clang::serialized_diags::create(DiagOpts->DiagnosticSerializationFile,
441 &*DiagOpts, /*MergeChildRecords=*/true);
442 Diags.setClient(new ChainedDiagnosticConsumer(
443 Diags.takeClient(), std::move(SerializedConsumer)));
446 ProcessWarningOptions(Diags, *DiagOpts, /*ReportDiags=*/false);
448 Driver TheDriver(Path, llvm::sys::getDefaultTargetTriple(), Diags);
449 SetInstallDir(argv, TheDriver, CanonicalPrefixes);
451 insertTargetAndModeArgs(TargetAndMode.first, TargetAndMode.second, argv,
454 SetBackdoorDriverOutputsFromEnvVars(TheDriver);
456 std::unique_ptr<Compilation> C(TheDriver.BuildCompilation(argv));
458 SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
460 Res = TheDriver.ExecuteCompilation(*C, FailingCommands);
462 // Force a crash to test the diagnostics.
463 if (TheDriver.GenReproducer) {
464 Diags.Report(diag::err_drv_force_crash)
465 << !::getenv("FORCE_CLANG_DIAGNOSTICS_CRASH");
467 // Pretend that every command failed.
468 FailingCommands.clear();
469 for (const auto &J : C->getJobs())
470 if (const Command *C = dyn_cast<Command>(&J))
471 FailingCommands.push_back(std::make_pair(-1, C));
474 for (const auto &P : FailingCommands) {
475 int CommandRes = P.first;
476 const Command *FailingCommand = P.second;
480 // If result status is < 0, then the driver command signalled an error.
481 // If result status is 70, then the driver command reported a fatal error.
482 // On Windows, abort will return an exit code of 3. In these cases,
483 // generate additional diagnostic information if possible.
484 bool DiagnoseCrash = CommandRes < 0 || CommandRes == 70;
486 DiagnoseCrash |= CommandRes == 3;
489 TheDriver.generateCompilationDiagnostics(*C, *FailingCommand);
494 Diags.getClient()->finish();
496 // If any timers were active but haven't been destroyed yet, print their
497 // results now. This happens in -disable-free mode.
498 llvm::TimerGroup::printAll(llvm::errs());
501 // Exit status should not be negative on Win32, unless abnormal termination.
502 // Once abnormal termiation was caught, negative status should not be
508 // If we have multiple failing commands, we return the result of the first