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 "ToolChains/Arch/ARM.h"
11 #include "ToolChains/Clang.h"
12 #include "ToolChains/Flang.h"
13 #include "ToolChains/InterfaceStubs.h"
14 #include "clang/Basic/ObjCRuntime.h"
15 #include "clang/Basic/Sanitizers.h"
16 #include "clang/Config/config.h"
17 #include "clang/Driver/Action.h"
18 #include "clang/Driver/Driver.h"
19 #include "clang/Driver/DriverDiagnostic.h"
20 #include "clang/Driver/InputInfo.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/MC/TargetRegistry.h"
33 #include "llvm/Option/Arg.h"
34 #include "llvm/Option/ArgList.h"
35 #include "llvm/Option/OptTable.h"
36 #include "llvm/Option/Option.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/FileSystem.h"
39 #include "llvm/Support/Path.h"
40 #include "llvm/Support/TargetParser.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   std::string RuntimePath = getRuntimePath();
79   if (getVFS().exists(RuntimePath))
80     getLibraryPaths().push_back(RuntimePath);
81 
82   std::string StdlibPath = getStdlibPath();
83   if (getVFS().exists(StdlibPath))
84     getFilePaths().push_back(StdlibPath);
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   if (is_style_windows(llvm::sys::path::Style::native)) {
173     // Transform to lowercase for case insensitive file systems.
174     std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(),
175                    ::tolower);
176   }
177   return ProgName;
178 }
179 
180 static const DriverSuffix *parseDriverSuffix(StringRef ProgName, size_t &Pos) {
181   // Try to infer frontend type and default target from the program name by
182   // comparing it against DriverSuffixes in order.
183 
184   // If there is a match, the function tries to identify a target as prefix.
185   // E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
186   // prefix "x86_64-linux". If such a target prefix is found, it may be
187   // added via -target as implicit first argument.
188   const DriverSuffix *DS = FindDriverSuffix(ProgName, Pos);
189 
190   if (!DS) {
191     // Try again after stripping any trailing version number:
192     // clang++3.5 -> clang++
193     ProgName = ProgName.rtrim("0123456789.");
194     DS = FindDriverSuffix(ProgName, Pos);
195   }
196 
197   if (!DS) {
198     // Try again after stripping trailing -component.
199     // clang++-tot -> clang++
200     ProgName = ProgName.slice(0, ProgName.rfind('-'));
201     DS = FindDriverSuffix(ProgName, Pos);
202   }
203   return DS;
204 }
205 
206 ParsedClangName
207 ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
208   std::string ProgName = normalizeProgramName(PN);
209   size_t SuffixPos;
210   const DriverSuffix *DS = parseDriverSuffix(ProgName, SuffixPos);
211   if (!DS)
212     return {};
213   size_t SuffixEnd = SuffixPos + strlen(DS->Suffix);
214 
215   size_t LastComponent = ProgName.rfind('-', SuffixPos);
216   if (LastComponent == std::string::npos)
217     return ParsedClangName(ProgName.substr(0, SuffixEnd), DS->ModeFlag);
218   std::string ModeSuffix = ProgName.substr(LastComponent + 1,
219                                            SuffixEnd - LastComponent - 1);
220 
221   // Infer target from the prefix.
222   StringRef Prefix(ProgName);
223   Prefix = Prefix.slice(0, LastComponent);
224   std::string IgnoredError;
225   bool IsRegistered =
226       llvm::TargetRegistry::lookupTarget(std::string(Prefix), IgnoredError);
227   return ParsedClangName{std::string(Prefix), ModeSuffix, DS->ModeFlag,
228                          IsRegistered};
229 }
230 
231 StringRef ToolChain::getDefaultUniversalArchName() const {
232   // In universal driver terms, the arch name accepted by -arch isn't exactly
233   // the same as the ones that appear in the triple. Roughly speaking, this is
234   // an inverse of the darwin::getArchTypeForDarwinArchName() function.
235   switch (Triple.getArch()) {
236   case llvm::Triple::aarch64: {
237     if (getTriple().isArm64e())
238       return "arm64e";
239     return "arm64";
240   }
241   case llvm::Triple::aarch64_32:
242     return "arm64_32";
243   case llvm::Triple::ppc:
244     return "ppc";
245   case llvm::Triple::ppcle:
246     return "ppcle";
247   case llvm::Triple::ppc64:
248     return "ppc64";
249   case llvm::Triple::ppc64le:
250     return "ppc64le";
251   default:
252     return Triple.getArchName();
253   }
254 }
255 
256 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
257   return Input.getFilename();
258 }
259 
260 bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
261   return false;
262 }
263 
264 Tool *ToolChain::getClang() const {
265   if (!Clang)
266     Clang.reset(new tools::Clang(*this));
267   return Clang.get();
268 }
269 
270 Tool *ToolChain::getFlang() const {
271   if (!Flang)
272     Flang.reset(new tools::Flang(*this));
273   return Flang.get();
274 }
275 
276 Tool *ToolChain::buildAssembler() const {
277   return new tools::ClangAs(*this);
278 }
279 
280 Tool *ToolChain::buildLinker() const {
281   llvm_unreachable("Linking is not supported by this toolchain");
282 }
283 
284 Tool *ToolChain::buildStaticLibTool() const {
285   llvm_unreachable("Creating static lib is not supported by this toolchain");
286 }
287 
288 Tool *ToolChain::getAssemble() const {
289   if (!Assemble)
290     Assemble.reset(buildAssembler());
291   return Assemble.get();
292 }
293 
294 Tool *ToolChain::getClangAs() const {
295   if (!Assemble)
296     Assemble.reset(new tools::ClangAs(*this));
297   return Assemble.get();
298 }
299 
300 Tool *ToolChain::getLink() const {
301   if (!Link)
302     Link.reset(buildLinker());
303   return Link.get();
304 }
305 
306 Tool *ToolChain::getStaticLibTool() const {
307   if (!StaticLibTool)
308     StaticLibTool.reset(buildStaticLibTool());
309   return StaticLibTool.get();
310 }
311 
312 Tool *ToolChain::getIfsMerge() const {
313   if (!IfsMerge)
314     IfsMerge.reset(new tools::ifstool::Merger(*this));
315   return IfsMerge.get();
316 }
317 
318 Tool *ToolChain::getOffloadBundler() const {
319   if (!OffloadBundler)
320     OffloadBundler.reset(new tools::OffloadBundler(*this));
321   return OffloadBundler.get();
322 }
323 
324 Tool *ToolChain::getOffloadWrapper() const {
325   if (!OffloadWrapper)
326     OffloadWrapper.reset(new tools::OffloadWrapper(*this));
327   return OffloadWrapper.get();
328 }
329 
330 Tool *ToolChain::getTool(Action::ActionClass AC) const {
331   switch (AC) {
332   case Action::AssembleJobClass:
333     return getAssemble();
334 
335   case Action::IfsMergeJobClass:
336     return getIfsMerge();
337 
338   case Action::LinkJobClass:
339     return getLink();
340 
341   case Action::StaticLibJobClass:
342     return getStaticLibTool();
343 
344   case Action::InputClass:
345   case Action::BindArchClass:
346   case Action::OffloadClass:
347   case Action::LipoJobClass:
348   case Action::DsymutilJobClass:
349   case Action::VerifyDebugInfoJobClass:
350     llvm_unreachable("Invalid tool kind.");
351 
352   case Action::CompileJobClass:
353   case Action::PrecompileJobClass:
354   case Action::HeaderModulePrecompileJobClass:
355   case Action::PreprocessJobClass:
356   case Action::AnalyzeJobClass:
357   case Action::MigrateJobClass:
358   case Action::VerifyPCHJobClass:
359   case Action::BackendJobClass:
360     return getClang();
361 
362   case Action::OffloadBundlingJobClass:
363   case Action::OffloadUnbundlingJobClass:
364     return getOffloadBundler();
365 
366   case Action::OffloadWrapperJobClass:
367     return getOffloadWrapper();
368   }
369 
370   llvm_unreachable("Invalid tool kind.");
371 }
372 
373 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
374                                              const ArgList &Args) {
375   const llvm::Triple &Triple = TC.getTriple();
376   bool IsWindows = Triple.isOSWindows();
377 
378   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
379     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
380                ? "armhf"
381                : "arm";
382 
383   // For historic reasons, Android library is using i686 instead of i386.
384   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
385     return "i686";
386 
387   if (TC.getArch() == llvm::Triple::x86_64 && Triple.isX32())
388     return "x32";
389 
390   return llvm::Triple::getArchTypeName(TC.getArch());
391 }
392 
393 StringRef ToolChain::getOSLibName() const {
394   if (Triple.isOSDarwin())
395     return "darwin";
396 
397   switch (Triple.getOS()) {
398   case llvm::Triple::FreeBSD:
399     return "freebsd";
400   case llvm::Triple::NetBSD:
401     return "netbsd";
402   case llvm::Triple::OpenBSD:
403     return "openbsd";
404   case llvm::Triple::Solaris:
405     return "sunos";
406   case llvm::Triple::AIX:
407     return "aix";
408   default:
409     return getOS();
410   }
411 }
412 
413 std::string ToolChain::getCompilerRTPath() const {
414   SmallString<128> Path(getDriver().ResourceDir);
415   if (Triple.isOSUnknown()) {
416     llvm::sys::path::append(Path, "lib");
417   } else {
418     llvm::sys::path::append(Path, "lib", getOSLibName());
419   }
420   return std::string(Path.str());
421 }
422 
423 std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
424                                              StringRef Component,
425                                              FileType Type) const {
426   std::string CRTAbsolutePath = getCompilerRT(Args, Component, Type);
427   return llvm::sys::path::filename(CRTAbsolutePath).str();
428 }
429 
430 std::string ToolChain::buildCompilerRTBasename(const llvm::opt::ArgList &Args,
431                                                StringRef Component,
432                                                FileType Type,
433                                                bool AddArch) const {
434   const llvm::Triple &TT = getTriple();
435   bool IsITANMSVCWindows =
436       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
437 
438   const char *Prefix =
439       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
440   const char *Suffix;
441   switch (Type) {
442   case ToolChain::FT_Object:
443     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
444     break;
445   case ToolChain::FT_Static:
446     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
447     break;
448   case ToolChain::FT_Shared:
449     Suffix = TT.isOSWindows()
450                  ? (TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
451                  : ".so";
452     break;
453   }
454 
455   std::string ArchAndEnv;
456   if (AddArch) {
457     StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
458     const char *Env = TT.isAndroid() ? "-android" : "";
459     ArchAndEnv = ("-" + Arch + Env).str();
460   }
461   return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
462 }
463 
464 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
465                                      FileType Type) const {
466   // Check for runtime files in the new layout without the architecture first.
467   std::string CRTBasename =
468       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
469   for (const auto &LibPath : getLibraryPaths()) {
470     SmallString<128> P(LibPath);
471     llvm::sys::path::append(P, CRTBasename);
472     if (getVFS().exists(P))
473       return std::string(P.str());
474   }
475 
476   // Fall back to the old expected compiler-rt name if the new one does not
477   // exist.
478   CRTBasename =
479       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
480   SmallString<128> Path(getCompilerRTPath());
481   llvm::sys::path::append(Path, CRTBasename);
482   return std::string(Path.str());
483 }
484 
485 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
486                                               StringRef Component,
487                                               FileType Type) const {
488   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
489 }
490 
491 std::string ToolChain::getRuntimePath() const {
492   SmallString<128> P(D.ResourceDir);
493   llvm::sys::path::append(P, "lib", getTripleString());
494   return std::string(P.str());
495 }
496 
497 std::string ToolChain::getStdlibPath() const {
498   SmallString<128> P(D.Dir);
499   llvm::sys::path::append(P, "..", "lib", getTripleString());
500   return std::string(P.str());
501 }
502 
503 std::string ToolChain::getArchSpecificLibPath() const {
504   SmallString<128> Path(getDriver().ResourceDir);
505   llvm::sys::path::append(Path, "lib", getOSLibName(),
506                           llvm::Triple::getArchTypeName(getArch()));
507   return std::string(Path.str());
508 }
509 
510 bool ToolChain::needsProfileRT(const ArgList &Args) {
511   if (Args.hasArg(options::OPT_noprofilelib))
512     return false;
513 
514   return Args.hasArg(options::OPT_fprofile_generate) ||
515          Args.hasArg(options::OPT_fprofile_generate_EQ) ||
516          Args.hasArg(options::OPT_fcs_profile_generate) ||
517          Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
518          Args.hasArg(options::OPT_fprofile_instr_generate) ||
519          Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
520          Args.hasArg(options::OPT_fcreate_profile) ||
521          Args.hasArg(options::OPT_forder_file_instrumentation);
522 }
523 
524 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
525   return Args.hasArg(options::OPT_coverage) ||
526          Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
527                       false);
528 }
529 
530 Tool *ToolChain::SelectTool(const JobAction &JA) const {
531   if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
532   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
533   Action::ActionClass AC = JA.getKind();
534   if (AC == Action::AssembleJobClass && useIntegratedAs())
535     return getClangAs();
536   return getTool(AC);
537 }
538 
539 std::string ToolChain::GetFilePath(const char *Name) const {
540   return D.GetFilePath(Name, *this);
541 }
542 
543 std::string ToolChain::GetProgramPath(const char *Name) const {
544   return D.GetProgramPath(Name, *this);
545 }
546 
547 std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD,
548                                      bool *LinkerIsLLDDarwinNew) const {
549   if (LinkerIsLLD)
550     *LinkerIsLLD = false;
551   if (LinkerIsLLDDarwinNew)
552     *LinkerIsLLDDarwinNew = false;
553 
554   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
555   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
556   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
557   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
558 
559   // --ld-path= takes precedence over -fuse-ld= and specifies the executable
560   // name. -B, COMPILER_PATH and PATH and consulted if the value does not
561   // contain a path component separator.
562   if (const Arg *A = Args.getLastArg(options::OPT_ld_path_EQ)) {
563     std::string Path(A->getValue());
564     if (!Path.empty()) {
565       if (llvm::sys::path::parent_path(Path).empty())
566         Path = GetProgramPath(A->getValue());
567       if (llvm::sys::fs::can_execute(Path))
568         return std::string(Path);
569     }
570     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
571     return GetProgramPath(getDefaultLinker());
572   }
573   // If we're passed -fuse-ld= with no argument, or with the argument ld,
574   // then use whatever the default system linker is.
575   if (UseLinker.empty() || UseLinker == "ld") {
576     const char *DefaultLinker = getDefaultLinker();
577     if (llvm::sys::path::is_absolute(DefaultLinker))
578       return std::string(DefaultLinker);
579     else
580       return GetProgramPath(DefaultLinker);
581   }
582 
583   // Extending -fuse-ld= to an absolute or relative path is unexpected. Checking
584   // for the linker flavor is brittle. In addition, prepending "ld." or "ld64."
585   // to a relative path is surprising. This is more complex due to priorities
586   // among -B, COMPILER_PATH and PATH. --ld-path= should be used instead.
587   if (UseLinker.contains('/'))
588     getDriver().Diag(diag::warn_drv_fuse_ld_path);
589 
590   if (llvm::sys::path::is_absolute(UseLinker)) {
591     // If we're passed what looks like an absolute path, don't attempt to
592     // second-guess that.
593     if (llvm::sys::fs::can_execute(UseLinker))
594       return std::string(UseLinker);
595   } else {
596     llvm::SmallString<8> LinkerName;
597     if (Triple.isOSDarwin())
598       LinkerName.append("ld64.");
599     else
600       LinkerName.append("ld.");
601     LinkerName.append(UseLinker);
602 
603     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
604     if (llvm::sys::fs::can_execute(LinkerPath)) {
605       // FIXME: Remove LinkerIsLLDDarwinNew once there's only one MachO lld.
606       if (LinkerIsLLD)
607         *LinkerIsLLD = UseLinker == "lld" || UseLinker == "lld.darwinold";
608       if (LinkerIsLLDDarwinNew)
609         *LinkerIsLLDDarwinNew = UseLinker == "lld";
610       return LinkerPath;
611     }
612   }
613 
614   if (A)
615     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
616 
617   return GetProgramPath(getDefaultLinker());
618 }
619 
620 std::string ToolChain::GetStaticLibToolPath() const {
621   // TODO: Add support for static lib archiving on Windows
622   if (Triple.isOSDarwin())
623     return GetProgramPath("libtool");
624   return GetProgramPath("llvm-ar");
625 }
626 
627 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
628   types::ID id = types::lookupTypeForExtension(Ext);
629 
630   // Flang always runs the preprocessor and has no notion of "preprocessed
631   // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
632   // them differently.
633   if (D.IsFlangMode() && id == types::TY_PP_Fortran)
634     id = types::TY_Fortran;
635 
636   return id;
637 }
638 
639 bool ToolChain::HasNativeLLVMSupport() const {
640   return false;
641 }
642 
643 bool ToolChain::isCrossCompiling() const {
644   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
645   switch (HostTriple.getArch()) {
646   // The A32/T32/T16 instruction sets are not separate architectures in this
647   // context.
648   case llvm::Triple::arm:
649   case llvm::Triple::armeb:
650   case llvm::Triple::thumb:
651   case llvm::Triple::thumbeb:
652     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
653            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
654   default:
655     return HostTriple.getArch() != getArch();
656   }
657 }
658 
659 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
660   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
661                      VersionTuple());
662 }
663 
664 llvm::ExceptionHandling
665 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
666   return llvm::ExceptionHandling::None;
667 }
668 
669 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
670   if (Model == "single") {
671     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
672     return Triple.getArch() == llvm::Triple::arm ||
673            Triple.getArch() == llvm::Triple::armeb ||
674            Triple.getArch() == llvm::Triple::thumb ||
675            Triple.getArch() == llvm::Triple::thumbeb || Triple.isWasm();
676   } else if (Model == "posix")
677     return true;
678 
679   return false;
680 }
681 
682 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
683                                          types::ID InputType) const {
684   switch (getTriple().getArch()) {
685   default:
686     return getTripleString();
687 
688   case llvm::Triple::x86_64: {
689     llvm::Triple Triple = getTriple();
690     if (!Triple.isOSBinFormatMachO())
691       return getTripleString();
692 
693     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
694       // x86_64h goes in the triple. Other -march options just use the
695       // vanilla triple we already have.
696       StringRef MArch = A->getValue();
697       if (MArch == "x86_64h")
698         Triple.setArchName(MArch);
699     }
700     return Triple.getTriple();
701   }
702   case llvm::Triple::aarch64: {
703     llvm::Triple Triple = getTriple();
704     if (!Triple.isOSBinFormatMachO())
705       return getTripleString();
706 
707     if (Triple.isArm64e())
708       return getTripleString();
709 
710     // FIXME: older versions of ld64 expect the "arm64" component in the actual
711     // triple string and query it to determine whether an LTO file can be
712     // handled. Remove this when we don't care any more.
713     Triple.setArchName("arm64");
714     return Triple.getTriple();
715   }
716   case llvm::Triple::aarch64_32:
717     return getTripleString();
718   case llvm::Triple::arm:
719   case llvm::Triple::armeb:
720   case llvm::Triple::thumb:
721   case llvm::Triple::thumbeb: {
722     llvm::Triple Triple = getTriple();
723     tools::arm::setArchNameInTriple(getDriver(), Args, InputType, Triple);
724     tools::arm::setFloatABIInTriple(getDriver(), Args, Triple);
725     return Triple.getTriple();
726   }
727   }
728 }
729 
730 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
731                                                    types::ID InputType) const {
732   return ComputeLLVMTriple(Args, InputType);
733 }
734 
735 std::string ToolChain::computeSysRoot() const {
736   return D.SysRoot;
737 }
738 
739 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
740                                           ArgStringList &CC1Args) const {
741   // Each toolchain should provide the appropriate include flags.
742 }
743 
744 void ToolChain::addClangTargetOptions(
745     const ArgList &DriverArgs, ArgStringList &CC1Args,
746     Action::OffloadKind DeviceOffloadKind) const {}
747 
748 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
749 
750 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
751                                  llvm::opt::ArgStringList &CmdArgs) const {
752   if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
753     return;
754 
755   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
756 }
757 
758 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
759     const ArgList &Args) const {
760   if (runtimeLibType)
761     return *runtimeLibType;
762 
763   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
764   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
765 
766   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
767   if (LibName == "compiler-rt")
768     runtimeLibType = ToolChain::RLT_CompilerRT;
769   else if (LibName == "libgcc")
770     runtimeLibType = ToolChain::RLT_Libgcc;
771   else if (LibName == "platform")
772     runtimeLibType = GetDefaultRuntimeLibType();
773   else {
774     if (A)
775       getDriver().Diag(diag::err_drv_invalid_rtlib_name)
776           << A->getAsString(Args);
777 
778     runtimeLibType = GetDefaultRuntimeLibType();
779   }
780 
781   return *runtimeLibType;
782 }
783 
784 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
785     const ArgList &Args) const {
786   if (unwindLibType)
787     return *unwindLibType;
788 
789   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
790   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
791 
792   if (LibName == "none")
793     unwindLibType = ToolChain::UNW_None;
794   else if (LibName == "platform" || LibName == "") {
795     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
796     if (RtLibType == ToolChain::RLT_CompilerRT) {
797       if (getTriple().isAndroid() || getTriple().isOSAIX())
798         unwindLibType = ToolChain::UNW_CompilerRT;
799       else
800         unwindLibType = ToolChain::UNW_None;
801     } else if (RtLibType == ToolChain::RLT_Libgcc)
802       unwindLibType = ToolChain::UNW_Libgcc;
803   } else if (LibName == "libunwind") {
804     if (GetRuntimeLibType(Args) == RLT_Libgcc)
805       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
806     unwindLibType = ToolChain::UNW_CompilerRT;
807   } else if (LibName == "libgcc")
808     unwindLibType = ToolChain::UNW_Libgcc;
809   else {
810     if (A)
811       getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
812           << A->getAsString(Args);
813 
814     unwindLibType = GetDefaultUnwindLibType();
815   }
816 
817   return *unwindLibType;
818 }
819 
820 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
821   if (cxxStdlibType)
822     return *cxxStdlibType;
823 
824   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
825   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
826 
827   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
828   if (LibName == "libc++")
829     cxxStdlibType = ToolChain::CST_Libcxx;
830   else if (LibName == "libstdc++")
831     cxxStdlibType = ToolChain::CST_Libstdcxx;
832   else if (LibName == "platform")
833     cxxStdlibType = GetDefaultCXXStdlibType();
834   else {
835     if (A)
836       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
837           << A->getAsString(Args);
838 
839     cxxStdlibType = GetDefaultCXXStdlibType();
840   }
841 
842   return *cxxStdlibType;
843 }
844 
845 /// Utility function to add a system include directory to CC1 arguments.
846 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
847                                             ArgStringList &CC1Args,
848                                             const Twine &Path) {
849   CC1Args.push_back("-internal-isystem");
850   CC1Args.push_back(DriverArgs.MakeArgString(Path));
851 }
852 
853 /// Utility function to add a system include directory with extern "C"
854 /// semantics to CC1 arguments.
855 ///
856 /// Note that this should be used rarely, and only for directories that
857 /// historically and for legacy reasons are treated as having implicit extern
858 /// "C" semantics. These semantics are *ignored* by and large today, but its
859 /// important to preserve the preprocessor changes resulting from the
860 /// classification.
861 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
862                                                    ArgStringList &CC1Args,
863                                                    const Twine &Path) {
864   CC1Args.push_back("-internal-externc-isystem");
865   CC1Args.push_back(DriverArgs.MakeArgString(Path));
866 }
867 
868 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
869                                                 ArgStringList &CC1Args,
870                                                 const Twine &Path) {
871   if (llvm::sys::fs::exists(Path))
872     addExternCSystemInclude(DriverArgs, CC1Args, Path);
873 }
874 
875 /// Utility function to add a list of system include directories to CC1.
876 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
877                                              ArgStringList &CC1Args,
878                                              ArrayRef<StringRef> Paths) {
879   for (const auto &Path : Paths) {
880     CC1Args.push_back("-internal-isystem");
881     CC1Args.push_back(DriverArgs.MakeArgString(Path));
882   }
883 }
884 
885 std::string ToolChain::detectLibcxxVersion(StringRef IncludePath) const {
886   std::error_code EC;
887   int MaxVersion = 0;
888   std::string MaxVersionString;
889   SmallString<128> Path(IncludePath);
890   llvm::sys::path::append(Path, "c++");
891   for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(Path, EC), LE;
892        !EC && LI != LE; LI = LI.increment(EC)) {
893     StringRef VersionText = llvm::sys::path::filename(LI->path());
894     int Version;
895     if (VersionText[0] == 'v' &&
896         !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
897       if (Version > MaxVersion) {
898         MaxVersion = Version;
899         MaxVersionString = std::string(VersionText);
900       }
901     }
902   }
903   if (!MaxVersion)
904     return "";
905   return MaxVersionString;
906 }
907 
908 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
909                                              ArgStringList &CC1Args) const {
910   // Header search paths should be handled by each of the subclasses.
911   // Historically, they have not been, and instead have been handled inside of
912   // the CC1-layer frontend. As the logic is hoisted out, this generic function
913   // will slowly stop being called.
914   //
915   // While it is being called, replicate a bit of a hack to propagate the
916   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
917   // header search paths with it. Once all systems are overriding this
918   // function, the CC1 flag and this line can be removed.
919   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
920 }
921 
922 void ToolChain::AddClangCXXStdlibIsystemArgs(
923     const llvm::opt::ArgList &DriverArgs,
924     llvm::opt::ArgStringList &CC1Args) const {
925   DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
926   if (!DriverArgs.hasArg(options::OPT_nostdinc, options::OPT_nostdincxx,
927                          options::OPT_nostdlibinc))
928     for (const auto &P :
929          DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
930       addSystemInclude(DriverArgs, CC1Args, P);
931 }
932 
933 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
934   return getDriver().CCCIsCXX() &&
935          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
936                       options::OPT_nostdlibxx);
937 }
938 
939 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
940                                     ArgStringList &CmdArgs) const {
941   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
942          "should not have called this");
943   CXXStdlibType Type = GetCXXStdlibType(Args);
944 
945   switch (Type) {
946   case ToolChain::CST_Libcxx:
947     CmdArgs.push_back("-lc++");
948     break;
949 
950   case ToolChain::CST_Libstdcxx:
951     CmdArgs.push_back("-lstdc++");
952     break;
953   }
954 }
955 
956 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
957                                    ArgStringList &CmdArgs) const {
958   for (const auto &LibPath : getFilePaths())
959     if(LibPath.length() > 0)
960       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
961 }
962 
963 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
964                                  ArgStringList &CmdArgs) const {
965   CmdArgs.push_back("-lcc_kext");
966 }
967 
968 bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
969                                            std::string &Path) const {
970   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
971   // (to keep the linker options consistent with gcc and clang itself).
972   if (!isOptimizationLevelFast(Args)) {
973     // Check if -ffast-math or -funsafe-math.
974     Arg *A =
975       Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
976                       options::OPT_funsafe_math_optimizations,
977                       options::OPT_fno_unsafe_math_optimizations);
978 
979     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
980         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
981       return false;
982   }
983   // If crtfastmath.o exists add it to the arguments.
984   Path = GetFilePath("crtfastmath.o");
985   return (Path != "crtfastmath.o"); // Not found.
986 }
987 
988 bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
989                                               ArgStringList &CmdArgs) const {
990   std::string Path;
991   if (isFastMathRuntimeAvailable(Args, Path)) {
992     CmdArgs.push_back(Args.MakeArgString(Path));
993     return true;
994   }
995 
996   return false;
997 }
998 
999 SanitizerMask ToolChain::getSupportedSanitizers() const {
1000   // Return sanitizers which don't require runtime support and are not
1001   // platform dependent.
1002 
1003   SanitizerMask Res =
1004       (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
1005        ~SanitizerKind::Function) |
1006       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
1007       SanitizerKind::CFICastStrict | SanitizerKind::FloatDivideByZero |
1008       SanitizerKind::UnsignedIntegerOverflow |
1009       SanitizerKind::UnsignedShiftBase | SanitizerKind::ImplicitConversion |
1010       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1011   if (getTriple().getArch() == llvm::Triple::x86 ||
1012       getTriple().getArch() == llvm::Triple::x86_64 ||
1013       getTriple().getArch() == llvm::Triple::arm || getTriple().isWasm() ||
1014       getTriple().isAArch64())
1015     Res |= SanitizerKind::CFIICall;
1016   if (getTriple().getArch() == llvm::Triple::x86_64 ||
1017       getTriple().isAArch64(64) || getTriple().isRISCV())
1018     Res |= SanitizerKind::ShadowCallStack;
1019   if (getTriple().isAArch64(64))
1020     Res |= SanitizerKind::MemTag;
1021   return Res;
1022 }
1023 
1024 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1025                                    ArgStringList &CC1Args) const {}
1026 
1027 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1028                                   ArgStringList &CC1Args) const {}
1029 
1030 llvm::SmallVector<ToolChain::BitCodeLibraryInfo, 12>
1031 ToolChain::getHIPDeviceLibs(const ArgList &DriverArgs) const {
1032   return {};
1033 }
1034 
1035 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1036                                     ArgStringList &CC1Args) const {}
1037 
1038 static VersionTuple separateMSVCFullVersion(unsigned Version) {
1039   if (Version < 100)
1040     return VersionTuple(Version);
1041 
1042   if (Version < 10000)
1043     return VersionTuple(Version / 100, Version % 100);
1044 
1045   unsigned Build = 0, Factor = 1;
1046   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
1047     Build = Build + (Version % 10) * Factor;
1048   return VersionTuple(Version / 100, Version % 100, Build);
1049 }
1050 
1051 VersionTuple
1052 ToolChain::computeMSVCVersion(const Driver *D,
1053                               const llvm::opt::ArgList &Args) const {
1054   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
1055   const Arg *MSCompatibilityVersion =
1056       Args.getLastArg(options::OPT_fms_compatibility_version);
1057 
1058   if (MSCVersion && MSCompatibilityVersion) {
1059     if (D)
1060       D->Diag(diag::err_drv_argument_not_allowed_with)
1061           << MSCVersion->getAsString(Args)
1062           << MSCompatibilityVersion->getAsString(Args);
1063     return VersionTuple();
1064   }
1065 
1066   if (MSCompatibilityVersion) {
1067     VersionTuple MSVT;
1068     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
1069       if (D)
1070         D->Diag(diag::err_drv_invalid_value)
1071             << MSCompatibilityVersion->getAsString(Args)
1072             << MSCompatibilityVersion->getValue();
1073     } else {
1074       return MSVT;
1075     }
1076   }
1077 
1078   if (MSCVersion) {
1079     unsigned Version = 0;
1080     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
1081       if (D)
1082         D->Diag(diag::err_drv_invalid_value)
1083             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
1084     } else {
1085       return separateMSVCFullVersion(Version);
1086     }
1087   }
1088 
1089   return VersionTuple();
1090 }
1091 
1092 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
1093     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
1094     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
1095   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1096   const OptTable &Opts = getDriver().getOpts();
1097   bool Modified = false;
1098 
1099   // Handle -Xopenmp-target flags
1100   for (auto *A : Args) {
1101     // Exclude flags which may only apply to the host toolchain.
1102     // Do not exclude flags when the host triple (AuxTriple)
1103     // matches the current toolchain triple. If it is not present
1104     // at all, target and host share a toolchain.
1105     if (A->getOption().matches(options::OPT_m_Group)) {
1106       if (SameTripleAsHost)
1107         DAL->append(A);
1108       else
1109         Modified = true;
1110       continue;
1111     }
1112 
1113     unsigned Index;
1114     unsigned Prev;
1115     bool XOpenMPTargetNoTriple =
1116         A->getOption().matches(options::OPT_Xopenmp_target);
1117 
1118     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
1119       // Passing device args: -Xopenmp-target=<triple> -opt=val.
1120       if (A->getValue(0) == getTripleString())
1121         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1122       else
1123         continue;
1124     } else if (XOpenMPTargetNoTriple) {
1125       // Passing device args: -Xopenmp-target -opt=val.
1126       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
1127     } else {
1128       DAL->append(A);
1129       continue;
1130     }
1131 
1132     // Parse the argument to -Xopenmp-target.
1133     Prev = Index;
1134     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
1135     if (!XOpenMPTargetArg || Index > Prev + 1) {
1136       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
1137           << A->getAsString(Args);
1138       continue;
1139     }
1140     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
1141         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
1142       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
1143       continue;
1144     }
1145     XOpenMPTargetArg->setBaseArg(A);
1146     A = XOpenMPTargetArg.release();
1147     AllocatedArgs.push_back(A);
1148     DAL->append(A);
1149     Modified = true;
1150   }
1151 
1152   if (Modified)
1153     return DAL;
1154 
1155   delete DAL;
1156   return nullptr;
1157 }
1158 
1159 // TODO: Currently argument values separated by space e.g.
1160 // -Xclang -mframe-pointer=no cannot be passed by -Xarch_. This should be
1161 // fixed.
1162 void ToolChain::TranslateXarchArgs(
1163     const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
1164     llvm::opt::DerivedArgList *DAL,
1165     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1166   const OptTable &Opts = getDriver().getOpts();
1167   unsigned ValuePos = 1;
1168   if (A->getOption().matches(options::OPT_Xarch_device) ||
1169       A->getOption().matches(options::OPT_Xarch_host))
1170     ValuePos = 0;
1171 
1172   unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(ValuePos));
1173   unsigned Prev = Index;
1174   std::unique_ptr<llvm::opt::Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1175 
1176   // If the argument parsing failed or more than one argument was
1177   // consumed, the -Xarch_ argument's parameter tried to consume
1178   // extra arguments. Emit an error and ignore.
1179   //
1180   // We also want to disallow any options which would alter the
1181   // driver behavior; that isn't going to work in our model. We
1182   // use options::NoXarchOption to control this.
1183   if (!XarchArg || Index > Prev + 1) {
1184     getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1185         << A->getAsString(Args);
1186     return;
1187   } else if (XarchArg->getOption().hasFlag(options::NoXarchOption)) {
1188     auto &Diags = getDriver().getDiags();
1189     unsigned DiagID =
1190         Diags.getCustomDiagID(DiagnosticsEngine::Error,
1191                               "invalid Xarch argument: '%0', not all driver "
1192                               "options can be forwared via Xarch argument");
1193     Diags.Report(DiagID) << A->getAsString(Args);
1194     return;
1195   }
1196   XarchArg->setBaseArg(A);
1197   A = XarchArg.release();
1198   if (!AllocatedArgs)
1199     DAL->AddSynthesizedArg(A);
1200   else
1201     AllocatedArgs->push_back(A);
1202 }
1203 
1204 llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1205     const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1206     Action::OffloadKind OFK,
1207     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1208   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1209   bool Modified = false;
1210 
1211   bool IsGPU = OFK == Action::OFK_Cuda || OFK == Action::OFK_HIP;
1212   for (Arg *A : Args) {
1213     bool NeedTrans = false;
1214     bool Skip = false;
1215     if (A->getOption().matches(options::OPT_Xarch_device)) {
1216       NeedTrans = IsGPU;
1217       Skip = !IsGPU;
1218     } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1219       NeedTrans = !IsGPU;
1220       Skip = IsGPU;
1221     } else if (A->getOption().matches(options::OPT_Xarch__) && IsGPU) {
1222       // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1223       // they may need special translation.
1224       // Skip this argument unless the architecture matches BoundArch
1225       if (BoundArch.empty() || A->getValue(0) != BoundArch)
1226         Skip = true;
1227       else
1228         NeedTrans = true;
1229     }
1230     if (NeedTrans || Skip)
1231       Modified = true;
1232     if (NeedTrans)
1233       TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1234     if (!Skip)
1235       DAL->append(A);
1236   }
1237 
1238   if (Modified)
1239     return DAL;
1240 
1241   delete DAL;
1242   return nullptr;
1243 }
1244