1 //===- ToolChain.cpp - Collections of tools for one platform --------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "clang/Driver/ToolChain.h"
10 #include "InputInfo.h"
11 #include "ToolChains/Arch/ARM.h"
12 #include "ToolChains/Clang.h"
13 #include "ToolChains/InterfaceStubs.h"
14 #include "ToolChains/Flang.h"
15 #include "clang/Basic/ObjCRuntime.h"
16 #include "clang/Basic/Sanitizers.h"
17 #include "clang/Config/config.h"
18 #include "clang/Driver/Action.h"
19 #include "clang/Driver/Driver.h"
20 #include "clang/Driver/DriverDiagnostic.h"
21 #include "clang/Driver/Job.h"
22 #include "clang/Driver/Options.h"
23 #include "clang/Driver/SanitizerArgs.h"
24 #include "clang/Driver/XRayArgs.h"
25 #include "llvm/ADT/STLExtras.h"
26 #include "llvm/ADT/SmallString.h"
27 #include "llvm/ADT/StringRef.h"
28 #include "llvm/ADT/Triple.h"
29 #include "llvm/ADT/Twine.h"
30 #include "llvm/Config/llvm-config.h"
31 #include "llvm/MC/MCTargetOptions.h"
32 #include "llvm/Option/Arg.h"
33 #include "llvm/Option/ArgList.h"
34 #include "llvm/Option/OptTable.h"
35 #include "llvm/Option/Option.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/FileSystem.h"
38 #include "llvm/Support/Path.h"
39 #include "llvm/Support/TargetParser.h"
40 #include "llvm/Support/TargetRegistry.h"
41 #include "llvm/Support/VersionTuple.h"
42 #include "llvm/Support/VirtualFileSystem.h"
43 #include <cassert>
44 #include <cstddef>
45 #include <cstring>
46 #include <string>
47 
48 using namespace clang;
49 using namespace driver;
50 using namespace tools;
51 using namespace llvm;
52 using namespace llvm::opt;
53 
54 static llvm::opt::Arg *GetRTTIArgument(const ArgList &Args) {
55   return Args.getLastArg(options::OPT_mkernel, options::OPT_fapple_kext,
56                          options::OPT_fno_rtti, options::OPT_frtti);
57 }
58 
59 static ToolChain::RTTIMode CalculateRTTIMode(const ArgList &Args,
60                                              const llvm::Triple &Triple,
61                                              const Arg *CachedRTTIArg) {
62   // Explicit rtti/no-rtti args
63   if (CachedRTTIArg) {
64     if (CachedRTTIArg->getOption().matches(options::OPT_frtti))
65       return ToolChain::RM_Enabled;
66     else
67       return ToolChain::RM_Disabled;
68   }
69 
70   // -frtti is default, except for the PS4 CPU.
71   return (Triple.isPS4CPU()) ? ToolChain::RM_Disabled : ToolChain::RM_Enabled;
72 }
73 
74 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
75                      const ArgList &Args)
76     : D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
77       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
78   if (D.CCCIsCXX()) {
79     if (auto CXXStdlibPath = getCXXStdlibPath())
80       getFilePaths().push_back(*CXXStdlibPath);
81   }
82 
83   if (auto RuntimePath = getRuntimePath())
84     getLibraryPaths().push_back(*RuntimePath);
85 
86   std::string CandidateLibPath = getArchSpecificLibPath();
87   if (getVFS().exists(CandidateLibPath))
88     getFilePaths().push_back(CandidateLibPath);
89 }
90 
91 void ToolChain::setTripleEnvironment(llvm::Triple::EnvironmentType Env) {
92   Triple.setEnvironment(Env);
93   if (EffectiveTriple != llvm::Triple())
94     EffectiveTriple.setEnvironment(Env);
95 }
96 
97 ToolChain::~ToolChain() = default;
98 
99 llvm::vfs::FileSystem &ToolChain::getVFS() const {
100   return getDriver().getVFS();
101 }
102 
103 bool ToolChain::useIntegratedAs() const {
104   return Args.hasFlag(options::OPT_fintegrated_as,
105                       options::OPT_fno_integrated_as,
106                       IsIntegratedAssemblerDefault());
107 }
108 
109 bool ToolChain::useRelaxRelocations() const {
110   return ENABLE_X86_RELAX_RELOCATIONS;
111 }
112 
113 bool ToolChain::isNoExecStackDefault() const {
114     return false;
115 }
116 
117 const SanitizerArgs& ToolChain::getSanitizerArgs() const {
118   if (!SanitizerArguments.get())
119     SanitizerArguments.reset(new SanitizerArgs(*this, Args));
120   return *SanitizerArguments.get();
121 }
122 
123 const XRayArgs& ToolChain::getXRayArgs() const {
124   if (!XRayArguments.get())
125     XRayArguments.reset(new XRayArgs(*this, Args));
126   return *XRayArguments.get();
127 }
128 
129 namespace {
130 
131 struct DriverSuffix {
132   const char *Suffix;
133   const char *ModeFlag;
134 };
135 
136 } // namespace
137 
138 static const DriverSuffix *FindDriverSuffix(StringRef ProgName, size_t &Pos) {
139   // A list of known driver suffixes. Suffixes are compared against the
140   // program name in order. If there is a match, the frontend type is updated as
141   // necessary by applying the ModeFlag.
142   static const DriverSuffix DriverSuffixes[] = {
143       {"clang", nullptr},
144       {"clang++", "--driver-mode=g++"},
145       {"clang-c++", "--driver-mode=g++"},
146       {"clang-cc", nullptr},
147       {"clang-cpp", "--driver-mode=cpp"},
148       {"clang-g++", "--driver-mode=g++"},
149       {"clang-gcc", nullptr},
150       {"clang-cl", "--driver-mode=cl"},
151       {"cc", nullptr},
152       {"cpp", "--driver-mode=cpp"},
153       {"cl", "--driver-mode=cl"},
154       {"++", "--driver-mode=g++"},
155       {"flang", "--driver-mode=flang"},
156   };
157 
158   for (size_t i = 0; i < llvm::array_lengthof(DriverSuffixes); ++i) {
159     StringRef Suffix(DriverSuffixes[i].Suffix);
160     if (ProgName.endswith(Suffix)) {
161       Pos = ProgName.size() - Suffix.size();
162       return &DriverSuffixes[i];
163     }
164   }
165   return nullptr;
166 }
167 
168 /// Normalize the program name from argv[0] by stripping the file extension if
169 /// present and lower-casing the string on Windows.
170 static std::string normalizeProgramName(llvm::StringRef Argv0) {
171   std::string ProgName = std::string(llvm::sys::path::stem(Argv0));
172 #ifdef _WIN32
173   // Transform to lowercase for case insensitive file systems.
174   std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(), ::tolower);
175 #endif
176   return ProgName;
177 }
178 
179 static const DriverSuffix *parseDriverSuffix(StringRef ProgName, size_t &Pos) {
180   // Try to infer frontend type and default target from the program name by
181   // comparing it against DriverSuffixes in order.
182 
183   // If there is a match, the function tries to identify a target as prefix.
184   // E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
185   // prefix "x86_64-linux". If such a target prefix is found, it may be
186   // added via -target as implicit first argument.
187   const DriverSuffix *DS = FindDriverSuffix(ProgName, Pos);
188 
189   if (!DS) {
190     // Try again after stripping any trailing version number:
191     // clang++3.5 -> clang++
192     ProgName = ProgName.rtrim("0123456789.");
193     DS = FindDriverSuffix(ProgName, Pos);
194   }
195 
196   if (!DS) {
197     // Try again after stripping trailing -component.
198     // clang++-tot -> clang++
199     ProgName = ProgName.slice(0, ProgName.rfind('-'));
200     DS = FindDriverSuffix(ProgName, Pos);
201   }
202   return DS;
203 }
204 
205 ParsedClangName
206 ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
207   std::string ProgName = normalizeProgramName(PN);
208   size_t SuffixPos;
209   const DriverSuffix *DS = parseDriverSuffix(ProgName, SuffixPos);
210   if (!DS)
211     return {};
212   size_t SuffixEnd = SuffixPos + strlen(DS->Suffix);
213 
214   size_t LastComponent = ProgName.rfind('-', SuffixPos);
215   if (LastComponent == std::string::npos)
216     return ParsedClangName(ProgName.substr(0, SuffixEnd), DS->ModeFlag);
217   std::string ModeSuffix = ProgName.substr(LastComponent + 1,
218                                            SuffixEnd - LastComponent - 1);
219 
220   // Infer target from the prefix.
221   StringRef Prefix(ProgName);
222   Prefix = Prefix.slice(0, LastComponent);
223   std::string IgnoredError;
224   bool IsRegistered =
225       llvm::TargetRegistry::lookupTarget(std::string(Prefix), IgnoredError);
226   return ParsedClangName{std::string(Prefix), ModeSuffix, DS->ModeFlag,
227                          IsRegistered};
228 }
229 
230 StringRef ToolChain::getDefaultUniversalArchName() const {
231   // In universal driver terms, the arch name accepted by -arch isn't exactly
232   // the same as the ones that appear in the triple. Roughly speaking, this is
233   // an inverse of the darwin::getArchTypeForDarwinArchName() function.
234   switch (Triple.getArch()) {
235   case llvm::Triple::aarch64: {
236     if (getTriple().isArm64e())
237       return "arm64e";
238     return "arm64";
239   }
240   case llvm::Triple::aarch64_32:
241     return "arm64_32";
242   case llvm::Triple::ppc:
243     return "ppc";
244   case llvm::Triple::ppcle:
245     return "ppcle";
246   case llvm::Triple::ppc64:
247     return "ppc64";
248   case llvm::Triple::ppc64le:
249     return "ppc64le";
250   default:
251     return Triple.getArchName();
252   }
253 }
254 
255 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
256   return Input.getFilename();
257 }
258 
259 bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
260   return false;
261 }
262 
263 Tool *ToolChain::getClang() const {
264   if (!Clang)
265     Clang.reset(new tools::Clang(*this));
266   return Clang.get();
267 }
268 
269 Tool *ToolChain::getFlang() const {
270   if (!Flang)
271     Flang.reset(new tools::Flang(*this));
272   return Flang.get();
273 }
274 
275 Tool *ToolChain::buildAssembler() const {
276   return new tools::ClangAs(*this);
277 }
278 
279 Tool *ToolChain::buildLinker() const {
280   llvm_unreachable("Linking is not supported by this toolchain");
281 }
282 
283 Tool *ToolChain::buildStaticLibTool() const {
284   llvm_unreachable("Creating static lib is not supported by this toolchain");
285 }
286 
287 Tool *ToolChain::getAssemble() const {
288   if (!Assemble)
289     Assemble.reset(buildAssembler());
290   return Assemble.get();
291 }
292 
293 Tool *ToolChain::getClangAs() const {
294   if (!Assemble)
295     Assemble.reset(new tools::ClangAs(*this));
296   return Assemble.get();
297 }
298 
299 Tool *ToolChain::getLink() const {
300   if (!Link)
301     Link.reset(buildLinker());
302   return Link.get();
303 }
304 
305 Tool *ToolChain::getStaticLibTool() const {
306   if (!StaticLibTool)
307     StaticLibTool.reset(buildStaticLibTool());
308   return StaticLibTool.get();
309 }
310 
311 Tool *ToolChain::getIfsMerge() const {
312   if (!IfsMerge)
313     IfsMerge.reset(new tools::ifstool::Merger(*this));
314   return IfsMerge.get();
315 }
316 
317 Tool *ToolChain::getOffloadBundler() const {
318   if (!OffloadBundler)
319     OffloadBundler.reset(new tools::OffloadBundler(*this));
320   return OffloadBundler.get();
321 }
322 
323 Tool *ToolChain::getOffloadWrapper() const {
324   if (!OffloadWrapper)
325     OffloadWrapper.reset(new tools::OffloadWrapper(*this));
326   return OffloadWrapper.get();
327 }
328 
329 Tool *ToolChain::getTool(Action::ActionClass AC) const {
330   switch (AC) {
331   case Action::AssembleJobClass:
332     return getAssemble();
333 
334   case Action::IfsMergeJobClass:
335     return getIfsMerge();
336 
337   case Action::LinkJobClass:
338     return getLink();
339 
340   case Action::StaticLibJobClass:
341     return getStaticLibTool();
342 
343   case Action::InputClass:
344   case Action::BindArchClass:
345   case Action::OffloadClass:
346   case Action::LipoJobClass:
347   case Action::DsymutilJobClass:
348   case Action::VerifyDebugInfoJobClass:
349     llvm_unreachable("Invalid tool kind.");
350 
351   case Action::CompileJobClass:
352   case Action::PrecompileJobClass:
353   case Action::HeaderModulePrecompileJobClass:
354   case Action::PreprocessJobClass:
355   case Action::AnalyzeJobClass:
356   case Action::MigrateJobClass:
357   case Action::VerifyPCHJobClass:
358   case Action::BackendJobClass:
359     return getClang();
360 
361   case Action::OffloadBundlingJobClass:
362   case Action::OffloadUnbundlingJobClass:
363     return getOffloadBundler();
364 
365   case Action::OffloadWrapperJobClass:
366     return getOffloadWrapper();
367   }
368 
369   llvm_unreachable("Invalid tool kind.");
370 }
371 
372 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
373                                              const ArgList &Args) {
374   const llvm::Triple &Triple = TC.getTriple();
375   bool IsWindows = Triple.isOSWindows();
376 
377   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
378     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
379                ? "armhf"
380                : "arm";
381 
382   // For historic reasons, Android library is using i686 instead of i386.
383   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
384     return "i686";
385 
386   return llvm::Triple::getArchTypeName(TC.getArch());
387 }
388 
389 StringRef ToolChain::getOSLibName() const {
390   switch (Triple.getOS()) {
391   case llvm::Triple::FreeBSD:
392     return "freebsd";
393   case llvm::Triple::NetBSD:
394     return "netbsd";
395   case llvm::Triple::OpenBSD:
396     return "openbsd";
397   case llvm::Triple::Solaris:
398     return "sunos";
399   case llvm::Triple::AIX:
400     return "aix";
401   default:
402     return getOS();
403   }
404 }
405 
406 std::string ToolChain::getCompilerRTPath() const {
407   SmallString<128> Path(getDriver().ResourceDir);
408   if (Triple.isOSUnknown()) {
409     llvm::sys::path::append(Path, "lib");
410   } else {
411     llvm::sys::path::append(Path, "lib", getOSLibName());
412   }
413   return std::string(Path.str());
414 }
415 
416 std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
417                                              StringRef Component,
418                                              FileType Type) const {
419   std::string CRTAbsolutePath = getCompilerRT(Args, Component, Type);
420   return llvm::sys::path::filename(CRTAbsolutePath).str();
421 }
422 
423 std::string ToolChain::buildCompilerRTBasename(const llvm::opt::ArgList &Args,
424                                                StringRef Component,
425                                                FileType Type,
426                                                bool AddArch) const {
427   const llvm::Triple &TT = getTriple();
428   bool IsITANMSVCWindows =
429       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
430 
431   const char *Prefix =
432       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
433   const char *Suffix;
434   switch (Type) {
435   case ToolChain::FT_Object:
436     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
437     break;
438   case ToolChain::FT_Static:
439     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
440     break;
441   case ToolChain::FT_Shared:
442     Suffix = TT.isOSWindows()
443                  ? (TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
444                  : ".so";
445     break;
446   }
447 
448   std::string ArchAndEnv;
449   if (AddArch) {
450     StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
451     const char *Env = TT.isAndroid() ? "-android" : "";
452     ArchAndEnv = ("-" + Arch + Env).str();
453   }
454   return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
455 }
456 
457 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
458                                      FileType Type) const {
459   // Check for runtime files in the new layout without the architecture first.
460   std::string CRTBasename =
461       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
462   for (const auto &LibPath : getLibraryPaths()) {
463     SmallString<128> P(LibPath);
464     llvm::sys::path::append(P, CRTBasename);
465     if (getVFS().exists(P))
466       return std::string(P.str());
467   }
468 
469   // Fall back to the old expected compiler-rt name if the new one does not
470   // exist.
471   CRTBasename =
472       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
473   SmallString<128> Path(getCompilerRTPath());
474   llvm::sys::path::append(Path, CRTBasename);
475   return std::string(Path.str());
476 }
477 
478 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
479                                               StringRef Component,
480                                               FileType Type) const {
481   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
482 }
483 
484 
485 Optional<std::string> ToolChain::getRuntimePath() const {
486   SmallString<128> P;
487 
488   // First try the triple passed to driver as --target=<triple>.
489   P.assign(D.ResourceDir);
490   llvm::sys::path::append(P, "lib", D.getTargetTriple());
491   if (getVFS().exists(P))
492     return llvm::Optional<std::string>(std::string(P.str()));
493 
494   // Second try the normalized triple.
495   P.assign(D.ResourceDir);
496   llvm::sys::path::append(P, "lib", Triple.str());
497   if (getVFS().exists(P))
498     return llvm::Optional<std::string>(std::string(P.str()));
499 
500   return None;
501 }
502 
503 Optional<std::string> ToolChain::getCXXStdlibPath() const {
504   SmallString<128> P;
505 
506   // First try the triple passed to driver as --target=<triple>.
507   P.assign(D.Dir);
508   llvm::sys::path::append(P, "..", "lib", D.getTargetTriple(), "c++");
509   if (getVFS().exists(P))
510     return llvm::Optional<std::string>(std::string(P.str()));
511 
512   // Second try the normalized triple.
513   P.assign(D.Dir);
514   llvm::sys::path::append(P, "..", "lib", Triple.str(), "c++");
515   if (getVFS().exists(P))
516     return llvm::Optional<std::string>(std::string(P.str()));
517 
518   return None;
519 }
520 
521 std::string ToolChain::getArchSpecificLibPath() const {
522   SmallString<128> Path(getDriver().ResourceDir);
523   llvm::sys::path::append(Path, "lib", getOSLibName(),
524                           llvm::Triple::getArchTypeName(getArch()));
525   return std::string(Path.str());
526 }
527 
528 bool ToolChain::needsProfileRT(const ArgList &Args) {
529   if (Args.hasArg(options::OPT_noprofilelib))
530     return false;
531 
532   return Args.hasArg(options::OPT_fprofile_generate) ||
533          Args.hasArg(options::OPT_fprofile_generate_EQ) ||
534          Args.hasArg(options::OPT_fcs_profile_generate) ||
535          Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
536          Args.hasArg(options::OPT_fprofile_instr_generate) ||
537          Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
538          Args.hasArg(options::OPT_fcreate_profile) ||
539          Args.hasArg(options::OPT_forder_file_instrumentation);
540 }
541 
542 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
543   return Args.hasArg(options::OPT_coverage) ||
544          Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
545                       false);
546 }
547 
548 Tool *ToolChain::SelectTool(const JobAction &JA) const {
549   if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
550   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
551   Action::ActionClass AC = JA.getKind();
552   if (AC == Action::AssembleJobClass && useIntegratedAs())
553     return getClangAs();
554   return getTool(AC);
555 }
556 
557 std::string ToolChain::GetFilePath(const char *Name) const {
558   return D.GetFilePath(Name, *this);
559 }
560 
561 std::string ToolChain::GetProgramPath(const char *Name) const {
562   return D.GetProgramPath(Name, *this);
563 }
564 
565 std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD,
566                                      bool *LinkerIsLLDDarwinNew) const {
567   if (LinkerIsLLD)
568     *LinkerIsLLD = false;
569   if (LinkerIsLLDDarwinNew)
570     *LinkerIsLLDDarwinNew = false;
571 
572   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
573   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
574   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
575   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
576 
577   // --ld-path= takes precedence over -fuse-ld= and specifies the executable
578   // name. -B, COMPILER_PATH and PATH and consulted if the value does not
579   // contain a path component separator.
580   if (const Arg *A = Args.getLastArg(options::OPT_ld_path_EQ)) {
581     std::string Path(A->getValue());
582     if (!Path.empty()) {
583       if (llvm::sys::path::parent_path(Path).empty())
584         Path = GetProgramPath(A->getValue());
585       if (llvm::sys::fs::can_execute(Path))
586         return std::string(Path);
587     }
588     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
589     return GetProgramPath(getDefaultLinker());
590   }
591   // If we're passed -fuse-ld= with no argument, or with the argument ld,
592   // then use whatever the default system linker is.
593   if (UseLinker.empty() || UseLinker == "ld") {
594     const char *DefaultLinker = getDefaultLinker();
595     if (llvm::sys::path::is_absolute(DefaultLinker))
596       return std::string(DefaultLinker);
597     else
598       return GetProgramPath(DefaultLinker);
599   }
600 
601   // Extending -fuse-ld= to an absolute or relative path is unexpected. Checking
602   // for the linker flavor is brittle. In addition, prepending "ld." or "ld64."
603   // to a relative path is surprising. This is more complex due to priorities
604   // among -B, COMPILER_PATH and PATH. --ld-path= should be used instead.
605   if (UseLinker.find('/') != StringRef::npos)
606     getDriver().Diag(diag::warn_drv_fuse_ld_path);
607 
608   if (llvm::sys::path::is_absolute(UseLinker)) {
609     // If we're passed what looks like an absolute path, don't attempt to
610     // second-guess that.
611     if (llvm::sys::fs::can_execute(UseLinker))
612       return std::string(UseLinker);
613   } else {
614     llvm::SmallString<8> LinkerName;
615     if (Triple.isOSDarwin())
616       LinkerName.append("ld64.");
617     else
618       LinkerName.append("ld.");
619     LinkerName.append(UseLinker);
620 
621     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
622     if (llvm::sys::fs::can_execute(LinkerPath)) {
623       // FIXME: Remove LinkerIsLLDDarwinNew once there's only one MachO lld.
624       if (LinkerIsLLD)
625         *LinkerIsLLD = UseLinker == "lld" || UseLinker == "lld.darwinold";
626       if (LinkerIsLLDDarwinNew)
627         *LinkerIsLLDDarwinNew = UseLinker == "lld";
628       return LinkerPath;
629     }
630   }
631 
632   if (A)
633     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
634 
635   return GetProgramPath(getDefaultLinker());
636 }
637 
638 std::string ToolChain::GetStaticLibToolPath() const {
639   // TODO: Add support for static lib archiving on Windows
640   return GetProgramPath("llvm-ar");
641 }
642 
643 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
644   types::ID id = types::lookupTypeForExtension(Ext);
645 
646   // Flang always runs the preprocessor and has no notion of "preprocessed
647   // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
648   // them differently.
649   if (D.IsFlangMode() && id == types::TY_PP_Fortran)
650     id = types::TY_Fortran;
651 
652   return id;
653 }
654 
655 bool ToolChain::HasNativeLLVMSupport() const {
656   return false;
657 }
658 
659 bool ToolChain::isCrossCompiling() const {
660   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
661   switch (HostTriple.getArch()) {
662   // The A32/T32/T16 instruction sets are not separate architectures in this
663   // context.
664   case llvm::Triple::arm:
665   case llvm::Triple::armeb:
666   case llvm::Triple::thumb:
667   case llvm::Triple::thumbeb:
668     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
669            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
670   default:
671     return HostTriple.getArch() != getArch();
672   }
673 }
674 
675 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
676   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
677                      VersionTuple());
678 }
679 
680 llvm::ExceptionHandling
681 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
682   return llvm::ExceptionHandling::None;
683 }
684 
685 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
686   if (Model == "single") {
687     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
688     return Triple.getArch() == llvm::Triple::arm ||
689            Triple.getArch() == llvm::Triple::armeb ||
690            Triple.getArch() == llvm::Triple::thumb ||
691            Triple.getArch() == llvm::Triple::thumbeb || Triple.isWasm();
692   } else if (Model == "posix")
693     return true;
694 
695   return false;
696 }
697 
698 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
699                                          types::ID InputType) const {
700   switch (getTriple().getArch()) {
701   default:
702     return getTripleString();
703 
704   case llvm::Triple::x86_64: {
705     llvm::Triple Triple = getTriple();
706     if (!Triple.isOSBinFormatMachO())
707       return getTripleString();
708 
709     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
710       // x86_64h goes in the triple. Other -march options just use the
711       // vanilla triple we already have.
712       StringRef MArch = A->getValue();
713       if (MArch == "x86_64h")
714         Triple.setArchName(MArch);
715     }
716     return Triple.getTriple();
717   }
718   case llvm::Triple::aarch64: {
719     llvm::Triple Triple = getTriple();
720     if (!Triple.isOSBinFormatMachO())
721       return getTripleString();
722 
723     if (Triple.isArm64e())
724       return getTripleString();
725 
726     // FIXME: older versions of ld64 expect the "arm64" component in the actual
727     // triple string and query it to determine whether an LTO file can be
728     // handled. Remove this when we don't care any more.
729     Triple.setArchName("arm64");
730     return Triple.getTriple();
731   }
732   case llvm::Triple::aarch64_32:
733     return getTripleString();
734   case llvm::Triple::arm:
735   case llvm::Triple::armeb:
736   case llvm::Triple::thumb:
737   case llvm::Triple::thumbeb: {
738     llvm::Triple Triple = getTriple();
739     tools::arm::setArchNameInTriple(getDriver(), Args, InputType, Triple);
740     tools::arm::setFloatABIInTriple(getDriver(), Args, Triple);
741     return Triple.getTriple();
742   }
743   }
744 }
745 
746 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
747                                                    types::ID InputType) const {
748   return ComputeLLVMTriple(Args, InputType);
749 }
750 
751 std::string ToolChain::computeSysRoot() const {
752   return D.SysRoot;
753 }
754 
755 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
756                                           ArgStringList &CC1Args) const {
757   // Each toolchain should provide the appropriate include flags.
758 }
759 
760 void ToolChain::addClangTargetOptions(
761     const ArgList &DriverArgs, ArgStringList &CC1Args,
762     Action::OffloadKind DeviceOffloadKind) const {}
763 
764 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
765 
766 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
767                                  llvm::opt::ArgStringList &CmdArgs) const {
768   if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
769     return;
770 
771   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
772 }
773 
774 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
775     const ArgList &Args) const {
776   if (runtimeLibType)
777     return *runtimeLibType;
778 
779   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
780   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
781 
782   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
783   if (LibName == "compiler-rt")
784     runtimeLibType = ToolChain::RLT_CompilerRT;
785   else if (LibName == "libgcc")
786     runtimeLibType = ToolChain::RLT_Libgcc;
787   else if (LibName == "platform")
788     runtimeLibType = GetDefaultRuntimeLibType();
789   else {
790     if (A)
791       getDriver().Diag(diag::err_drv_invalid_rtlib_name)
792           << A->getAsString(Args);
793 
794     runtimeLibType = GetDefaultRuntimeLibType();
795   }
796 
797   return *runtimeLibType;
798 }
799 
800 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
801     const ArgList &Args) const {
802   if (unwindLibType)
803     return *unwindLibType;
804 
805   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
806   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
807 
808   if (LibName == "none")
809     unwindLibType = ToolChain::UNW_None;
810   else if (LibName == "platform" || LibName == "") {
811     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
812     if (RtLibType == ToolChain::RLT_CompilerRT) {
813       if (getTriple().isAndroid())
814         unwindLibType = ToolChain::UNW_CompilerRT;
815       else
816         unwindLibType = ToolChain::UNW_None;
817     } else if (RtLibType == ToolChain::RLT_Libgcc)
818       unwindLibType = ToolChain::UNW_Libgcc;
819   } else if (LibName == "libunwind") {
820     if (GetRuntimeLibType(Args) == RLT_Libgcc)
821       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
822     unwindLibType = ToolChain::UNW_CompilerRT;
823   } else if (LibName == "libgcc")
824     unwindLibType = ToolChain::UNW_Libgcc;
825   else {
826     if (A)
827       getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
828           << A->getAsString(Args);
829 
830     unwindLibType = GetDefaultUnwindLibType();
831   }
832 
833   return *unwindLibType;
834 }
835 
836 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
837   if (cxxStdlibType)
838     return *cxxStdlibType;
839 
840   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
841   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
842 
843   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
844   if (LibName == "libc++")
845     cxxStdlibType = ToolChain::CST_Libcxx;
846   else if (LibName == "libstdc++")
847     cxxStdlibType = ToolChain::CST_Libstdcxx;
848   else if (LibName == "platform")
849     cxxStdlibType = GetDefaultCXXStdlibType();
850   else {
851     if (A)
852       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
853           << A->getAsString(Args);
854 
855     cxxStdlibType = GetDefaultCXXStdlibType();
856   }
857 
858   return *cxxStdlibType;
859 }
860 
861 /// Utility function to add a system include directory to CC1 arguments.
862 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
863                                             ArgStringList &CC1Args,
864                                             const Twine &Path) {
865   CC1Args.push_back("-internal-isystem");
866   CC1Args.push_back(DriverArgs.MakeArgString(Path));
867 }
868 
869 /// Utility function to add a system include directory with extern "C"
870 /// semantics to CC1 arguments.
871 ///
872 /// Note that this should be used rarely, and only for directories that
873 /// historically and for legacy reasons are treated as having implicit extern
874 /// "C" semantics. These semantics are *ignored* by and large today, but its
875 /// important to preserve the preprocessor changes resulting from the
876 /// classification.
877 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
878                                                    ArgStringList &CC1Args,
879                                                    const Twine &Path) {
880   CC1Args.push_back("-internal-externc-isystem");
881   CC1Args.push_back(DriverArgs.MakeArgString(Path));
882 }
883 
884 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
885                                                 ArgStringList &CC1Args,
886                                                 const Twine &Path) {
887   if (llvm::sys::fs::exists(Path))
888     addExternCSystemInclude(DriverArgs, CC1Args, Path);
889 }
890 
891 /// Utility function to add a list of system include directories to CC1.
892 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
893                                              ArgStringList &CC1Args,
894                                              ArrayRef<StringRef> Paths) {
895   for (const auto &Path : Paths) {
896     CC1Args.push_back("-internal-isystem");
897     CC1Args.push_back(DriverArgs.MakeArgString(Path));
898   }
899 }
900 
901 std::string ToolChain::detectLibcxxVersion(StringRef IncludePath) const {
902   std::error_code EC;
903   int MaxVersion = 0;
904   std::string MaxVersionString;
905   SmallString<128> Path(IncludePath);
906   llvm::sys::path::append(Path, "c++");
907   for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(Path, EC), LE;
908        !EC && LI != LE; LI = LI.increment(EC)) {
909     StringRef VersionText = llvm::sys::path::filename(LI->path());
910     int Version;
911     if (VersionText[0] == 'v' &&
912         !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
913       if (Version > MaxVersion) {
914         MaxVersion = Version;
915         MaxVersionString = std::string(VersionText);
916       }
917     }
918   }
919   if (!MaxVersion)
920     return "";
921   return MaxVersionString;
922 }
923 
924 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
925                                              ArgStringList &CC1Args) const {
926   // Header search paths should be handled by each of the subclasses.
927   // Historically, they have not been, and instead have been handled inside of
928   // the CC1-layer frontend. As the logic is hoisted out, this generic function
929   // will slowly stop being called.
930   //
931   // While it is being called, replicate a bit of a hack to propagate the
932   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
933   // header search paths with it. Once all systems are overriding this
934   // function, the CC1 flag and this line can be removed.
935   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
936 }
937 
938 void ToolChain::AddClangCXXStdlibIsystemArgs(
939     const llvm::opt::ArgList &DriverArgs,
940     llvm::opt::ArgStringList &CC1Args) const {
941   DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
942   if (!DriverArgs.hasArg(options::OPT_nostdinc, options::OPT_nostdincxx,
943                          options::OPT_nostdlibinc))
944     for (const auto &P :
945          DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
946       addSystemInclude(DriverArgs, CC1Args, P);
947 }
948 
949 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
950   return getDriver().CCCIsCXX() &&
951          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
952                       options::OPT_nostdlibxx);
953 }
954 
955 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
956                                     ArgStringList &CmdArgs) const {
957   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
958          "should not have called this");
959   CXXStdlibType Type = GetCXXStdlibType(Args);
960 
961   switch (Type) {
962   case ToolChain::CST_Libcxx:
963     CmdArgs.push_back("-lc++");
964     break;
965 
966   case ToolChain::CST_Libstdcxx:
967     CmdArgs.push_back("-lstdc++");
968     break;
969   }
970 }
971 
972 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
973                                    ArgStringList &CmdArgs) const {
974   for (const auto &LibPath : getFilePaths())
975     if(LibPath.length() > 0)
976       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
977 }
978 
979 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
980                                  ArgStringList &CmdArgs) const {
981   CmdArgs.push_back("-lcc_kext");
982 }
983 
984 bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
985                                            std::string &Path) const {
986   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
987   // (to keep the linker options consistent with gcc and clang itself).
988   if (!isOptimizationLevelFast(Args)) {
989     // Check if -ffast-math or -funsafe-math.
990     Arg *A =
991       Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
992                       options::OPT_funsafe_math_optimizations,
993                       options::OPT_fno_unsafe_math_optimizations);
994 
995     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
996         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
997       return false;
998   }
999   // If crtfastmath.o exists add it to the arguments.
1000   Path = GetFilePath("crtfastmath.o");
1001   return (Path != "crtfastmath.o"); // Not found.
1002 }
1003 
1004 bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
1005                                               ArgStringList &CmdArgs) const {
1006   std::string Path;
1007   if (isFastMathRuntimeAvailable(Args, Path)) {
1008     CmdArgs.push_back(Args.MakeArgString(Path));
1009     return true;
1010   }
1011 
1012   return false;
1013 }
1014 
1015 SanitizerMask ToolChain::getSupportedSanitizers() const {
1016   // Return sanitizers which don't require runtime support and are not
1017   // platform dependent.
1018 
1019   SanitizerMask Res =
1020       (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
1021        ~SanitizerKind::Function) |
1022       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
1023       SanitizerKind::CFICastStrict | SanitizerKind::FloatDivideByZero |
1024       SanitizerKind::UnsignedIntegerOverflow |
1025       SanitizerKind::UnsignedShiftBase | SanitizerKind::ImplicitConversion |
1026       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1027   if (getTriple().getArch() == llvm::Triple::x86 ||
1028       getTriple().getArch() == llvm::Triple::x86_64 ||
1029       getTriple().getArch() == llvm::Triple::arm || getTriple().isWasm() ||
1030       getTriple().isAArch64())
1031     Res |= SanitizerKind::CFIICall;
1032   if (getTriple().getArch() == llvm::Triple::x86_64 ||
1033       getTriple().isAArch64(64) || getTriple().isRISCV())
1034     Res |= SanitizerKind::ShadowCallStack;
1035   if (getTriple().isAArch64(64))
1036     Res |= SanitizerKind::MemTag;
1037   return Res;
1038 }
1039 
1040 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1041                                    ArgStringList &CC1Args) const {}
1042 
1043 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1044                                   ArgStringList &CC1Args) const {}
1045 
1046 llvm::SmallVector<std::string, 12>
1047 ToolChain::getHIPDeviceLibs(const ArgList &DriverArgs) const {
1048   return {};
1049 }
1050 
1051 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1052                                     ArgStringList &CC1Args) const {}
1053 
1054 static VersionTuple separateMSVCFullVersion(unsigned Version) {
1055   if (Version < 100)
1056     return VersionTuple(Version);
1057 
1058   if (Version < 10000)
1059     return VersionTuple(Version / 100, Version % 100);
1060 
1061   unsigned Build = 0, Factor = 1;
1062   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
1063     Build = Build + (Version % 10) * Factor;
1064   return VersionTuple(Version / 100, Version % 100, Build);
1065 }
1066 
1067 VersionTuple
1068 ToolChain::computeMSVCVersion(const Driver *D,
1069                               const llvm::opt::ArgList &Args) const {
1070   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
1071   const Arg *MSCompatibilityVersion =
1072       Args.getLastArg(options::OPT_fms_compatibility_version);
1073 
1074   if (MSCVersion && MSCompatibilityVersion) {
1075     if (D)
1076       D->Diag(diag::err_drv_argument_not_allowed_with)
1077           << MSCVersion->getAsString(Args)
1078           << MSCompatibilityVersion->getAsString(Args);
1079     return VersionTuple();
1080   }
1081 
1082   if (MSCompatibilityVersion) {
1083     VersionTuple MSVT;
1084     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
1085       if (D)
1086         D->Diag(diag::err_drv_invalid_value)
1087             << MSCompatibilityVersion->getAsString(Args)
1088             << MSCompatibilityVersion->getValue();
1089     } else {
1090       return MSVT;
1091     }
1092   }
1093 
1094   if (MSCVersion) {
1095     unsigned Version = 0;
1096     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
1097       if (D)
1098         D->Diag(diag::err_drv_invalid_value)
1099             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
1100     } else {
1101       return separateMSVCFullVersion(Version);
1102     }
1103   }
1104 
1105   return VersionTuple();
1106 }
1107 
1108 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
1109     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
1110     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
1111   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1112   const OptTable &Opts = getDriver().getOpts();
1113   bool Modified = false;
1114 
1115   // Handle -Xopenmp-target flags
1116   for (auto *A : Args) {
1117     // Exclude flags which may only apply to the host toolchain.
1118     // Do not exclude flags when the host triple (AuxTriple)
1119     // matches the current toolchain triple. If it is not present
1120     // at all, target and host share a toolchain.
1121     if (A->getOption().matches(options::OPT_m_Group)) {
1122       if (SameTripleAsHost)
1123         DAL->append(A);
1124       else
1125         Modified = true;
1126       continue;
1127     }
1128 
1129     unsigned Index;
1130     unsigned Prev;
1131     bool XOpenMPTargetNoTriple =
1132         A->getOption().matches(options::OPT_Xopenmp_target);
1133 
1134     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
1135       // Passing device args: -Xopenmp-target=<triple> -opt=val.
1136       if (A->getValue(0) == getTripleString())
1137         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1138       else
1139         continue;
1140     } else if (XOpenMPTargetNoTriple) {
1141       // Passing device args: -Xopenmp-target -opt=val.
1142       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
1143     } else {
1144       DAL->append(A);
1145       continue;
1146     }
1147 
1148     // Parse the argument to -Xopenmp-target.
1149     Prev = Index;
1150     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
1151     if (!XOpenMPTargetArg || Index > Prev + 1) {
1152       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
1153           << A->getAsString(Args);
1154       continue;
1155     }
1156     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
1157         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
1158       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
1159       continue;
1160     }
1161     XOpenMPTargetArg->setBaseArg(A);
1162     A = XOpenMPTargetArg.release();
1163     AllocatedArgs.push_back(A);
1164     DAL->append(A);
1165     Modified = true;
1166   }
1167 
1168   if (Modified)
1169     return DAL;
1170 
1171   delete DAL;
1172   return nullptr;
1173 }
1174 
1175 // TODO: Currently argument values separated by space e.g.
1176 // -Xclang -mframe-pointer=no cannot be passed by -Xarch_. This should be
1177 // fixed.
1178 void ToolChain::TranslateXarchArgs(
1179     const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
1180     llvm::opt::DerivedArgList *DAL,
1181     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1182   const OptTable &Opts = getDriver().getOpts();
1183   unsigned ValuePos = 1;
1184   if (A->getOption().matches(options::OPT_Xarch_device) ||
1185       A->getOption().matches(options::OPT_Xarch_host))
1186     ValuePos = 0;
1187 
1188   unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(ValuePos));
1189   unsigned Prev = Index;
1190   std::unique_ptr<llvm::opt::Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1191 
1192   // If the argument parsing failed or more than one argument was
1193   // consumed, the -Xarch_ argument's parameter tried to consume
1194   // extra arguments. Emit an error and ignore.
1195   //
1196   // We also want to disallow any options which would alter the
1197   // driver behavior; that isn't going to work in our model. We
1198   // use options::NoXarchOption to control this.
1199   if (!XarchArg || Index > Prev + 1) {
1200     getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1201         << A->getAsString(Args);
1202     return;
1203   } else if (XarchArg->getOption().hasFlag(options::NoXarchOption)) {
1204     auto &Diags = getDriver().getDiags();
1205     unsigned DiagID =
1206         Diags.getCustomDiagID(DiagnosticsEngine::Error,
1207                               "invalid Xarch argument: '%0', not all driver "
1208                               "options can be forwared via Xarch argument");
1209     Diags.Report(DiagID) << A->getAsString(Args);
1210     return;
1211   }
1212   XarchArg->setBaseArg(A);
1213   A = XarchArg.release();
1214   if (!AllocatedArgs)
1215     DAL->AddSynthesizedArg(A);
1216   else
1217     AllocatedArgs->push_back(A);
1218 }
1219 
1220 llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1221     const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1222     Action::OffloadKind OFK,
1223     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1224   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1225   bool Modified = false;
1226 
1227   bool IsGPU = OFK == Action::OFK_Cuda || OFK == Action::OFK_HIP;
1228   for (Arg *A : Args) {
1229     bool NeedTrans = false;
1230     bool Skip = false;
1231     if (A->getOption().matches(options::OPT_Xarch_device)) {
1232       NeedTrans = IsGPU;
1233       Skip = !IsGPU;
1234     } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1235       NeedTrans = !IsGPU;
1236       Skip = IsGPU;
1237     } else if (A->getOption().matches(options::OPT_Xarch__) && IsGPU) {
1238       // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1239       // they may need special translation.
1240       // Skip this argument unless the architecture matches BoundArch
1241       if (BoundArch.empty() || A->getValue(0) != BoundArch)
1242         Skip = true;
1243       else
1244         NeedTrans = true;
1245     }
1246     if (NeedTrans || Skip)
1247       Modified = true;
1248     if (NeedTrans)
1249       TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1250     if (!Skip)
1251       DAL->append(A);
1252   }
1253 
1254   if (Modified)
1255     return DAL;
1256 
1257   delete DAL;
1258   return nullptr;
1259 }
1260