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::ppc64:
245     return "ppc64";
246   case llvm::Triple::ppc64le:
247     return "ppc64le";
248   default:
249     return Triple.getArchName();
250   }
251 }
252 
253 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
254   return Input.getFilename();
255 }
256 
257 bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
258   return false;
259 }
260 
261 Tool *ToolChain::getClang() const {
262   if (!Clang)
263     Clang.reset(new tools::Clang(*this));
264   return Clang.get();
265 }
266 
267 Tool *ToolChain::getFlang() const {
268   if (!Flang)
269     Flang.reset(new tools::Flang(*this));
270   return Flang.get();
271 }
272 
273 Tool *ToolChain::buildAssembler() const {
274   return new tools::ClangAs(*this);
275 }
276 
277 Tool *ToolChain::buildLinker() const {
278   llvm_unreachable("Linking is not supported by this toolchain");
279 }
280 
281 Tool *ToolChain::buildStaticLibTool() const {
282   llvm_unreachable("Creating static lib is not supported by this toolchain");
283 }
284 
285 Tool *ToolChain::getAssemble() const {
286   if (!Assemble)
287     Assemble.reset(buildAssembler());
288   return Assemble.get();
289 }
290 
291 Tool *ToolChain::getClangAs() const {
292   if (!Assemble)
293     Assemble.reset(new tools::ClangAs(*this));
294   return Assemble.get();
295 }
296 
297 Tool *ToolChain::getLink() const {
298   if (!Link)
299     Link.reset(buildLinker());
300   return Link.get();
301 }
302 
303 Tool *ToolChain::getStaticLibTool() const {
304   if (!StaticLibTool)
305     StaticLibTool.reset(buildStaticLibTool());
306   return StaticLibTool.get();
307 }
308 
309 Tool *ToolChain::getIfsMerge() const {
310   if (!IfsMerge)
311     IfsMerge.reset(new tools::ifstool::Merger(*this));
312   return IfsMerge.get();
313 }
314 
315 Tool *ToolChain::getOffloadBundler() const {
316   if (!OffloadBundler)
317     OffloadBundler.reset(new tools::OffloadBundler(*this));
318   return OffloadBundler.get();
319 }
320 
321 Tool *ToolChain::getOffloadWrapper() const {
322   if (!OffloadWrapper)
323     OffloadWrapper.reset(new tools::OffloadWrapper(*this));
324   return OffloadWrapper.get();
325 }
326 
327 Tool *ToolChain::getTool(Action::ActionClass AC) const {
328   switch (AC) {
329   case Action::AssembleJobClass:
330     return getAssemble();
331 
332   case Action::IfsMergeJobClass:
333     return getIfsMerge();
334 
335   case Action::LinkJobClass:
336     return getLink();
337 
338   case Action::StaticLibJobClass:
339     return getStaticLibTool();
340 
341   case Action::InputClass:
342   case Action::BindArchClass:
343   case Action::OffloadClass:
344   case Action::LipoJobClass:
345   case Action::DsymutilJobClass:
346   case Action::VerifyDebugInfoJobClass:
347     llvm_unreachable("Invalid tool kind.");
348 
349   case Action::CompileJobClass:
350   case Action::PrecompileJobClass:
351   case Action::HeaderModulePrecompileJobClass:
352   case Action::PreprocessJobClass:
353   case Action::AnalyzeJobClass:
354   case Action::MigrateJobClass:
355   case Action::VerifyPCHJobClass:
356   case Action::BackendJobClass:
357     return getClang();
358 
359   case Action::OffloadBundlingJobClass:
360   case Action::OffloadUnbundlingJobClass:
361     return getOffloadBundler();
362 
363   case Action::OffloadWrapperJobClass:
364     return getOffloadWrapper();
365   }
366 
367   llvm_unreachable("Invalid tool kind.");
368 }
369 
370 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
371                                              const ArgList &Args) {
372   const llvm::Triple &Triple = TC.getTriple();
373   bool IsWindows = Triple.isOSWindows();
374 
375   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
376     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
377                ? "armhf"
378                : "arm";
379 
380   // For historic reasons, Android library is using i686 instead of i386.
381   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
382     return "i686";
383 
384   return llvm::Triple::getArchTypeName(TC.getArch());
385 }
386 
387 StringRef ToolChain::getOSLibName() const {
388   switch (Triple.getOS()) {
389   case llvm::Triple::FreeBSD:
390     return "freebsd";
391   case llvm::Triple::NetBSD:
392     return "netbsd";
393   case llvm::Triple::OpenBSD:
394     return "openbsd";
395   case llvm::Triple::Solaris:
396     return "sunos";
397   case llvm::Triple::AIX:
398     return "aix";
399   default:
400     return getOS();
401   }
402 }
403 
404 std::string ToolChain::getCompilerRTPath() const {
405   SmallString<128> Path(getDriver().ResourceDir);
406   if (Triple.isOSUnknown()) {
407     llvm::sys::path::append(Path, "lib");
408   } else {
409     llvm::sys::path::append(Path, "lib", getOSLibName());
410   }
411   return std::string(Path.str());
412 }
413 
414 std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
415                                              StringRef Component, FileType Type,
416                                              bool AddArch) const {
417   const llvm::Triple &TT = getTriple();
418   bool IsITANMSVCWindows =
419       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
420 
421   const char *Prefix =
422       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
423   const char *Suffix;
424   switch (Type) {
425   case ToolChain::FT_Object:
426     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
427     break;
428   case ToolChain::FT_Static:
429     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
430     break;
431   case ToolChain::FT_Shared:
432     Suffix = Triple.isOSWindows()
433                  ? (Triple.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
434                  : ".so";
435     break;
436   }
437 
438   std::string ArchAndEnv;
439   if (AddArch) {
440     StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
441     const char *Env = TT.isAndroid() ? "-android" : "";
442     ArchAndEnv = ("-" + Arch + Env).str();
443   }
444   return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
445 }
446 
447 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
448                                      FileType Type) const {
449   // Check for runtime files in the new layout without the architecture first.
450   std::string CRTBasename =
451       getCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
452   for (const auto &LibPath : getLibraryPaths()) {
453     SmallString<128> P(LibPath);
454     llvm::sys::path::append(P, CRTBasename);
455     if (getVFS().exists(P))
456       return std::string(P.str());
457   }
458 
459   // Fall back to the old expected compiler-rt name if the new one does not
460   // exist.
461   CRTBasename = getCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
462   SmallString<128> Path(getCompilerRTPath());
463   llvm::sys::path::append(Path, CRTBasename);
464   return std::string(Path.str());
465 }
466 
467 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
468                                               StringRef Component,
469                                               FileType Type) const {
470   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
471 }
472 
473 
474 Optional<std::string> ToolChain::getRuntimePath() const {
475   SmallString<128> P;
476 
477   // First try the triple passed to driver as --target=<triple>.
478   P.assign(D.ResourceDir);
479   llvm::sys::path::append(P, "lib", D.getTargetTriple());
480   if (getVFS().exists(P))
481     return llvm::Optional<std::string>(std::string(P.str()));
482 
483   // Second try the normalized triple.
484   P.assign(D.ResourceDir);
485   llvm::sys::path::append(P, "lib", Triple.str());
486   if (getVFS().exists(P))
487     return llvm::Optional<std::string>(std::string(P.str()));
488 
489   return None;
490 }
491 
492 Optional<std::string> ToolChain::getCXXStdlibPath() const {
493   SmallString<128> P;
494 
495   // First try the triple passed to driver as --target=<triple>.
496   P.assign(D.Dir);
497   llvm::sys::path::append(P, "..", "lib", D.getTargetTriple(), "c++");
498   if (getVFS().exists(P))
499     return llvm::Optional<std::string>(std::string(P.str()));
500 
501   // Second try the normalized triple.
502   P.assign(D.Dir);
503   llvm::sys::path::append(P, "..", "lib", Triple.str(), "c++");
504   if (getVFS().exists(P))
505     return llvm::Optional<std::string>(std::string(P.str()));
506 
507   return None;
508 }
509 
510 std::string ToolChain::getArchSpecificLibPath() const {
511   SmallString<128> Path(getDriver().ResourceDir);
512   llvm::sys::path::append(Path, "lib", getOSLibName(),
513                           llvm::Triple::getArchTypeName(getArch()));
514   return std::string(Path.str());
515 }
516 
517 bool ToolChain::needsProfileRT(const ArgList &Args) {
518   if (Args.hasArg(options::OPT_noprofilelib))
519     return false;
520 
521   return Args.hasArg(options::OPT_fprofile_generate) ||
522          Args.hasArg(options::OPT_fprofile_generate_EQ) ||
523          Args.hasArg(options::OPT_fcs_profile_generate) ||
524          Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
525          Args.hasArg(options::OPT_fprofile_instr_generate) ||
526          Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
527          Args.hasArg(options::OPT_fcreate_profile) ||
528          Args.hasArg(options::OPT_forder_file_instrumentation);
529 }
530 
531 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
532   return Args.hasArg(options::OPT_coverage) ||
533          Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
534                       false);
535 }
536 
537 Tool *ToolChain::SelectTool(const JobAction &JA) const {
538   if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
539   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
540   Action::ActionClass AC = JA.getKind();
541   if (AC == Action::AssembleJobClass && useIntegratedAs())
542     return getClangAs();
543   return getTool(AC);
544 }
545 
546 std::string ToolChain::GetFilePath(const char *Name) const {
547   return D.GetFilePath(Name, *this);
548 }
549 
550 std::string ToolChain::GetProgramPath(const char *Name) const {
551   return D.GetProgramPath(Name, *this);
552 }
553 
554 std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD,
555                                      bool *LinkerIsLLDDarwinNew) const {
556   if (LinkerIsLLD)
557     *LinkerIsLLD = false;
558   if (LinkerIsLLDDarwinNew)
559     *LinkerIsLLDDarwinNew = false;
560 
561   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
562   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
563   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
564   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
565 
566   // --ld-path= takes precedence over -fuse-ld= and specifies the executable
567   // name. -B, COMPILER_PATH and PATH and consulted if the value does not
568   // contain a path component separator.
569   if (const Arg *A = Args.getLastArg(options::OPT_ld_path_EQ)) {
570     std::string Path(A->getValue());
571     if (!Path.empty()) {
572       if (llvm::sys::path::parent_path(Path).empty())
573         Path = GetProgramPath(A->getValue());
574       if (llvm::sys::fs::can_execute(Path))
575         return std::string(Path);
576     }
577     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
578     return GetProgramPath(getDefaultLinker());
579   }
580   // If we're passed -fuse-ld= with no argument, or with the argument ld,
581   // then use whatever the default system linker is.
582   if (UseLinker.empty() || UseLinker == "ld") {
583     const char *DefaultLinker = getDefaultLinker();
584     if (llvm::sys::path::is_absolute(DefaultLinker))
585       return std::string(DefaultLinker);
586     else
587       return GetProgramPath(DefaultLinker);
588   }
589 
590   // Extending -fuse-ld= to an absolute or relative path is unexpected. Checking
591   // for the linker flavor is brittle. In addition, prepending "ld." or "ld64."
592   // to a relative path is surprising. This is more complex due to priorities
593   // among -B, COMPILER_PATH and PATH. --ld-path= should be used instead.
594   if (UseLinker.find('/') != StringRef::npos)
595     getDriver().Diag(diag::warn_drv_fuse_ld_path);
596 
597   if (llvm::sys::path::is_absolute(UseLinker)) {
598     // If we're passed what looks like an absolute path, don't attempt to
599     // second-guess that.
600     if (llvm::sys::fs::can_execute(UseLinker))
601       return std::string(UseLinker);
602   } else {
603     llvm::SmallString<8> LinkerName;
604     if (Triple.isOSDarwin())
605       LinkerName.append("ld64.");
606     else
607       LinkerName.append("ld.");
608     LinkerName.append(UseLinker);
609 
610     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
611     if (llvm::sys::fs::can_execute(LinkerPath)) {
612       // FIXME: Remove lld.darwinnew here once it's the only MachO lld.
613       if (LinkerIsLLD)
614         *LinkerIsLLD = UseLinker == "lld" || UseLinker == "lld.darwinnew";
615       if (LinkerIsLLDDarwinNew)
616         *LinkerIsLLDDarwinNew = UseLinker == "lld.darwinnew";
617       return LinkerPath;
618     }
619   }
620 
621   if (A)
622     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
623 
624   return GetProgramPath(getDefaultLinker());
625 }
626 
627 std::string ToolChain::GetStaticLibToolPath() const {
628   // TODO: Add support for static lib archiving on Windows
629   return GetProgramPath("llvm-ar");
630 }
631 
632 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
633   types::ID id = types::lookupTypeForExtension(Ext);
634 
635   // Flang always runs the preprocessor and has no notion of "preprocessed
636   // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
637   // them differently.
638   if (D.IsFlangMode() && id == types::TY_PP_Fortran)
639     id = types::TY_Fortran;
640 
641   return id;
642 }
643 
644 bool ToolChain::HasNativeLLVMSupport() const {
645   return false;
646 }
647 
648 bool ToolChain::isCrossCompiling() const {
649   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
650   switch (HostTriple.getArch()) {
651   // The A32/T32/T16 instruction sets are not separate architectures in this
652   // context.
653   case llvm::Triple::arm:
654   case llvm::Triple::armeb:
655   case llvm::Triple::thumb:
656   case llvm::Triple::thumbeb:
657     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
658            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
659   default:
660     return HostTriple.getArch() != getArch();
661   }
662 }
663 
664 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
665   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
666                      VersionTuple());
667 }
668 
669 llvm::ExceptionHandling
670 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
671   return llvm::ExceptionHandling::None;
672 }
673 
674 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
675   if (Model == "single") {
676     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
677     return Triple.getArch() == llvm::Triple::arm ||
678            Triple.getArch() == llvm::Triple::armeb ||
679            Triple.getArch() == llvm::Triple::thumb ||
680            Triple.getArch() == llvm::Triple::thumbeb || Triple.isWasm();
681   } else if (Model == "posix")
682     return true;
683 
684   return false;
685 }
686 
687 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
688                                          types::ID InputType) const {
689   switch (getTriple().getArch()) {
690   default:
691     return getTripleString();
692 
693   case llvm::Triple::x86_64: {
694     llvm::Triple Triple = getTriple();
695     if (!Triple.isOSBinFormatMachO())
696       return getTripleString();
697 
698     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
699       // x86_64h goes in the triple. Other -march options just use the
700       // vanilla triple we already have.
701       StringRef MArch = A->getValue();
702       if (MArch == "x86_64h")
703         Triple.setArchName(MArch);
704     }
705     return Triple.getTriple();
706   }
707   case llvm::Triple::aarch64: {
708     llvm::Triple Triple = getTriple();
709     if (!Triple.isOSBinFormatMachO())
710       return getTripleString();
711 
712     if (Triple.isArm64e())
713       return getTripleString();
714 
715     // FIXME: older versions of ld64 expect the "arm64" component in the actual
716     // triple string and query it to determine whether an LTO file can be
717     // handled. Remove this when we don't care any more.
718     Triple.setArchName("arm64");
719     return Triple.getTriple();
720   }
721   case llvm::Triple::aarch64_32:
722     return getTripleString();
723   case llvm::Triple::arm:
724   case llvm::Triple::armeb:
725   case llvm::Triple::thumb:
726   case llvm::Triple::thumbeb: {
727     // FIXME: Factor into subclasses.
728     llvm::Triple Triple = getTriple();
729     bool IsBigEndian = getTriple().getArch() == llvm::Triple::armeb ||
730                        getTriple().getArch() == llvm::Triple::thumbeb;
731 
732     // Handle pseudo-target flags '-mlittle-endian'/'-EL' and
733     // '-mbig-endian'/'-EB'.
734     if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
735                                  options::OPT_mbig_endian)) {
736       IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
737     }
738 
739     // Thumb2 is the default for V7 on Darwin.
740     //
741     // FIXME: Thumb should just be another -target-feaure, not in the triple.
742     StringRef MCPU, MArch;
743     if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
744       MCPU = A->getValue();
745     if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
746       MArch = A->getValue();
747     std::string CPU =
748         Triple.isOSBinFormatMachO()
749             ? tools::arm::getARMCPUForMArch(MArch, Triple).str()
750             : tools::arm::getARMTargetCPU(MCPU, MArch, Triple);
751     StringRef Suffix =
752       tools::arm::getLLVMArchSuffixForARM(CPU, MArch, Triple);
753     bool IsMProfile = ARM::parseArchProfile(Suffix) == ARM::ProfileKind::M;
754     bool ThumbDefault = IsMProfile || (ARM::parseArchVersion(Suffix) == 7 &&
755                                        getTriple().isOSBinFormatMachO());
756     // FIXME: this is invalid for WindowsCE
757     if (getTriple().isOSWindows())
758       ThumbDefault = true;
759     std::string ArchName;
760     if (IsBigEndian)
761       ArchName = "armeb";
762     else
763       ArchName = "arm";
764 
765     // Check if ARM ISA was explicitly selected (using -mno-thumb or -marm) for
766     // M-Class CPUs/architecture variants, which is not supported.
767     bool ARMModeRequested = !Args.hasFlag(options::OPT_mthumb,
768                                           options::OPT_mno_thumb, ThumbDefault);
769     if (IsMProfile && ARMModeRequested) {
770       if (!MCPU.empty())
771         getDriver().Diag(diag::err_cpu_unsupported_isa) << CPU << "ARM";
772        else
773         getDriver().Diag(diag::err_arch_unsupported_isa)
774           << tools::arm::getARMArch(MArch, getTriple()) << "ARM";
775     }
776 
777     // Check to see if an explicit choice to use thumb has been made via
778     // -mthumb. For assembler files we must check for -mthumb in the options
779     // passed to the assembler via -Wa or -Xassembler.
780     bool IsThumb = false;
781     if (InputType != types::TY_PP_Asm)
782       IsThumb = Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb,
783                               ThumbDefault);
784     else {
785       // Ideally we would check for these flags in
786       // CollectArgsForIntegratedAssembler but we can't change the ArchName at
787       // that point. There is no assembler equivalent of -mno-thumb, -marm, or
788       // -mno-arm.
789       for (const auto *A :
790            Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler)) {
791         for (StringRef Value : A->getValues()) {
792           if (Value == "-mthumb")
793             IsThumb = true;
794         }
795       }
796     }
797     // Assembly files should start in ARM mode, unless arch is M-profile, or
798     // -mthumb has been passed explicitly to the assembler. Windows is always
799     // thumb.
800     if (IsThumb || IsMProfile || getTriple().isOSWindows()) {
801       if (IsBigEndian)
802         ArchName = "thumbeb";
803       else
804         ArchName = "thumb";
805     }
806     Triple.setArchName(ArchName + Suffix.str());
807 
808     bool isHardFloat =
809         (arm::getARMFloatABI(getDriver(), Triple, Args) == arm::FloatABI::Hard);
810     switch (Triple.getEnvironment()) {
811     case Triple::GNUEABI:
812     case Triple::GNUEABIHF:
813       Triple.setEnvironment(isHardFloat ? Triple::GNUEABIHF : Triple::GNUEABI);
814       break;
815     case Triple::EABI:
816     case Triple::EABIHF:
817       Triple.setEnvironment(isHardFloat ? Triple::EABIHF : Triple::EABI);
818       break;
819     case Triple::MuslEABI:
820     case Triple::MuslEABIHF:
821       Triple.setEnvironment(isHardFloat ? Triple::MuslEABIHF
822                                         : Triple::MuslEABI);
823       break;
824     default: {
825       arm::FloatABI DefaultABI = arm::getDefaultFloatABI(Triple);
826       if (DefaultABI != arm::FloatABI::Invalid &&
827           isHardFloat != (DefaultABI == arm::FloatABI::Hard)) {
828         Arg *ABIArg =
829             Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
830                             options::OPT_mfloat_abi_EQ);
831         assert(ABIArg && "Non-default float abi expected to be from arg");
832         D.Diag(diag::err_drv_unsupported_opt_for_target)
833             << ABIArg->getAsString(Args) << Triple.getTriple();
834       }
835       break;
836     }
837     }
838 
839     return Triple.getTriple();
840   }
841   }
842 }
843 
844 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
845                                                    types::ID InputType) const {
846   return ComputeLLVMTriple(Args, InputType);
847 }
848 
849 std::string ToolChain::computeSysRoot() const {
850   return D.SysRoot;
851 }
852 
853 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
854                                           ArgStringList &CC1Args) const {
855   // Each toolchain should provide the appropriate include flags.
856 }
857 
858 void ToolChain::addClangTargetOptions(
859     const ArgList &DriverArgs, ArgStringList &CC1Args,
860     Action::OffloadKind DeviceOffloadKind) const {}
861 
862 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
863 
864 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
865                                  llvm::opt::ArgStringList &CmdArgs) const {
866   if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
867     return;
868 
869   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
870 }
871 
872 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
873     const ArgList &Args) const {
874   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
875   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
876 
877   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
878   if (LibName == "compiler-rt")
879     return ToolChain::RLT_CompilerRT;
880   else if (LibName == "libgcc")
881     return ToolChain::RLT_Libgcc;
882   else if (LibName == "platform")
883     return GetDefaultRuntimeLibType();
884 
885   if (A)
886     getDriver().Diag(diag::err_drv_invalid_rtlib_name) << A->getAsString(Args);
887 
888   return GetDefaultRuntimeLibType();
889 }
890 
891 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
892     const ArgList &Args) const {
893   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
894   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
895 
896   if (LibName == "none")
897     return ToolChain::UNW_None;
898   else if (LibName == "platform" || LibName == "") {
899     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
900     if (RtLibType == ToolChain::RLT_CompilerRT)
901       return ToolChain::UNW_None;
902     else if (RtLibType == ToolChain::RLT_Libgcc)
903       return ToolChain::UNW_Libgcc;
904   } else if (LibName == "libunwind") {
905     if (GetRuntimeLibType(Args) == RLT_Libgcc)
906       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
907     return ToolChain::UNW_CompilerRT;
908   } else if (LibName == "libgcc")
909     return ToolChain::UNW_Libgcc;
910 
911   if (A)
912     getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
913         << A->getAsString(Args);
914 
915   return GetDefaultUnwindLibType();
916 }
917 
918 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
919   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
920   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
921 
922   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
923   if (LibName == "libc++")
924     return ToolChain::CST_Libcxx;
925   else if (LibName == "libstdc++")
926     return ToolChain::CST_Libstdcxx;
927   else if (LibName == "platform")
928     return GetDefaultCXXStdlibType();
929 
930   if (A)
931     getDriver().Diag(diag::err_drv_invalid_stdlib_name) << A->getAsString(Args);
932 
933   return GetDefaultCXXStdlibType();
934 }
935 
936 /// Utility function to add a system include directory to CC1 arguments.
937 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
938                                             ArgStringList &CC1Args,
939                                             const Twine &Path) {
940   CC1Args.push_back("-internal-isystem");
941   CC1Args.push_back(DriverArgs.MakeArgString(Path));
942 }
943 
944 /// Utility function to add a system include directory with extern "C"
945 /// semantics to CC1 arguments.
946 ///
947 /// Note that this should be used rarely, and only for directories that
948 /// historically and for legacy reasons are treated as having implicit extern
949 /// "C" semantics. These semantics are *ignored* by and large today, but its
950 /// important to preserve the preprocessor changes resulting from the
951 /// classification.
952 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
953                                                    ArgStringList &CC1Args,
954                                                    const Twine &Path) {
955   CC1Args.push_back("-internal-externc-isystem");
956   CC1Args.push_back(DriverArgs.MakeArgString(Path));
957 }
958 
959 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
960                                                 ArgStringList &CC1Args,
961                                                 const Twine &Path) {
962   if (llvm::sys::fs::exists(Path))
963     addExternCSystemInclude(DriverArgs, CC1Args, Path);
964 }
965 
966 /// Utility function to add a list of system include directories to CC1.
967 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
968                                              ArgStringList &CC1Args,
969                                              ArrayRef<StringRef> Paths) {
970   for (const auto &Path : Paths) {
971     CC1Args.push_back("-internal-isystem");
972     CC1Args.push_back(DriverArgs.MakeArgString(Path));
973   }
974 }
975 
976 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
977                                              ArgStringList &CC1Args) const {
978   // Header search paths should be handled by each of the subclasses.
979   // Historically, they have not been, and instead have been handled inside of
980   // the CC1-layer frontend. As the logic is hoisted out, this generic function
981   // will slowly stop being called.
982   //
983   // While it is being called, replicate a bit of a hack to propagate the
984   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
985   // header search paths with it. Once all systems are overriding this
986   // function, the CC1 flag and this line can be removed.
987   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
988 }
989 
990 void ToolChain::AddClangCXXStdlibIsystemArgs(
991     const llvm::opt::ArgList &DriverArgs,
992     llvm::opt::ArgStringList &CC1Args) const {
993   DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
994   if (!DriverArgs.hasArg(options::OPT_nostdincxx))
995     for (const auto &P :
996          DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
997       addSystemInclude(DriverArgs, CC1Args, P);
998 }
999 
1000 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
1001   return getDriver().CCCIsCXX() &&
1002          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
1003                       options::OPT_nostdlibxx);
1004 }
1005 
1006 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
1007                                     ArgStringList &CmdArgs) const {
1008   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
1009          "should not have called this");
1010   CXXStdlibType Type = GetCXXStdlibType(Args);
1011 
1012   switch (Type) {
1013   case ToolChain::CST_Libcxx:
1014     CmdArgs.push_back("-lc++");
1015     break;
1016 
1017   case ToolChain::CST_Libstdcxx:
1018     CmdArgs.push_back("-lstdc++");
1019     break;
1020   }
1021 }
1022 
1023 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
1024                                    ArgStringList &CmdArgs) const {
1025   for (const auto &LibPath : getFilePaths())
1026     if(LibPath.length() > 0)
1027       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
1028 }
1029 
1030 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
1031                                  ArgStringList &CmdArgs) const {
1032   CmdArgs.push_back("-lcc_kext");
1033 }
1034 
1035 bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
1036                                            std::string &Path) const {
1037   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
1038   // (to keep the linker options consistent with gcc and clang itself).
1039   if (!isOptimizationLevelFast(Args)) {
1040     // Check if -ffast-math or -funsafe-math.
1041     Arg *A =
1042       Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
1043                       options::OPT_funsafe_math_optimizations,
1044                       options::OPT_fno_unsafe_math_optimizations);
1045 
1046     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
1047         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
1048       return false;
1049   }
1050   // If crtfastmath.o exists add it to the arguments.
1051   Path = GetFilePath("crtfastmath.o");
1052   return (Path != "crtfastmath.o"); // Not found.
1053 }
1054 
1055 bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
1056                                               ArgStringList &CmdArgs) const {
1057   std::string Path;
1058   if (isFastMathRuntimeAvailable(Args, Path)) {
1059     CmdArgs.push_back(Args.MakeArgString(Path));
1060     return true;
1061   }
1062 
1063   return false;
1064 }
1065 
1066 SanitizerMask ToolChain::getSupportedSanitizers() const {
1067   // Return sanitizers which don't require runtime support and are not
1068   // platform dependent.
1069 
1070   SanitizerMask Res =
1071       (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
1072        ~SanitizerKind::Function) |
1073       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
1074       SanitizerKind::CFICastStrict | SanitizerKind::FloatDivideByZero |
1075       SanitizerKind::UnsignedIntegerOverflow |
1076       SanitizerKind::UnsignedShiftBase | SanitizerKind::ImplicitConversion |
1077       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1078   if (getTriple().getArch() == llvm::Triple::x86 ||
1079       getTriple().getArch() == llvm::Triple::x86_64 ||
1080       getTriple().getArch() == llvm::Triple::arm || getTriple().isWasm() ||
1081       getTriple().isAArch64())
1082     Res |= SanitizerKind::CFIICall;
1083   if (getTriple().getArch() == llvm::Triple::x86_64 ||
1084       getTriple().isAArch64(64) || getTriple().isRISCV())
1085     Res |= SanitizerKind::ShadowCallStack;
1086   if (getTriple().isAArch64(64))
1087     Res |= SanitizerKind::MemTag;
1088   return Res;
1089 }
1090 
1091 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1092                                    ArgStringList &CC1Args) const {}
1093 
1094 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1095                                   ArgStringList &CC1Args) const {}
1096 
1097 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1098                                     ArgStringList &CC1Args) const {}
1099 
1100 static VersionTuple separateMSVCFullVersion(unsigned Version) {
1101   if (Version < 100)
1102     return VersionTuple(Version);
1103 
1104   if (Version < 10000)
1105     return VersionTuple(Version / 100, Version % 100);
1106 
1107   unsigned Build = 0, Factor = 1;
1108   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
1109     Build = Build + (Version % 10) * Factor;
1110   return VersionTuple(Version / 100, Version % 100, Build);
1111 }
1112 
1113 VersionTuple
1114 ToolChain::computeMSVCVersion(const Driver *D,
1115                               const llvm::opt::ArgList &Args) const {
1116   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
1117   const Arg *MSCompatibilityVersion =
1118       Args.getLastArg(options::OPT_fms_compatibility_version);
1119 
1120   if (MSCVersion && MSCompatibilityVersion) {
1121     if (D)
1122       D->Diag(diag::err_drv_argument_not_allowed_with)
1123           << MSCVersion->getAsString(Args)
1124           << MSCompatibilityVersion->getAsString(Args);
1125     return VersionTuple();
1126   }
1127 
1128   if (MSCompatibilityVersion) {
1129     VersionTuple MSVT;
1130     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
1131       if (D)
1132         D->Diag(diag::err_drv_invalid_value)
1133             << MSCompatibilityVersion->getAsString(Args)
1134             << MSCompatibilityVersion->getValue();
1135     } else {
1136       return MSVT;
1137     }
1138   }
1139 
1140   if (MSCVersion) {
1141     unsigned Version = 0;
1142     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
1143       if (D)
1144         D->Diag(diag::err_drv_invalid_value)
1145             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
1146     } else {
1147       return separateMSVCFullVersion(Version);
1148     }
1149   }
1150 
1151   return VersionTuple();
1152 }
1153 
1154 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
1155     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
1156     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
1157   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1158   const OptTable &Opts = getDriver().getOpts();
1159   bool Modified = false;
1160 
1161   // Handle -Xopenmp-target flags
1162   for (auto *A : Args) {
1163     // Exclude flags which may only apply to the host toolchain.
1164     // Do not exclude flags when the host triple (AuxTriple)
1165     // matches the current toolchain triple. If it is not present
1166     // at all, target and host share a toolchain.
1167     if (A->getOption().matches(options::OPT_m_Group)) {
1168       if (SameTripleAsHost)
1169         DAL->append(A);
1170       else
1171         Modified = true;
1172       continue;
1173     }
1174 
1175     unsigned Index;
1176     unsigned Prev;
1177     bool XOpenMPTargetNoTriple =
1178         A->getOption().matches(options::OPT_Xopenmp_target);
1179 
1180     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
1181       // Passing device args: -Xopenmp-target=<triple> -opt=val.
1182       if (A->getValue(0) == getTripleString())
1183         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1184       else
1185         continue;
1186     } else if (XOpenMPTargetNoTriple) {
1187       // Passing device args: -Xopenmp-target -opt=val.
1188       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
1189     } else {
1190       DAL->append(A);
1191       continue;
1192     }
1193 
1194     // Parse the argument to -Xopenmp-target.
1195     Prev = Index;
1196     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
1197     if (!XOpenMPTargetArg || Index > Prev + 1) {
1198       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
1199           << A->getAsString(Args);
1200       continue;
1201     }
1202     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
1203         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
1204       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
1205       continue;
1206     }
1207     XOpenMPTargetArg->setBaseArg(A);
1208     A = XOpenMPTargetArg.release();
1209     AllocatedArgs.push_back(A);
1210     DAL->append(A);
1211     Modified = true;
1212   }
1213 
1214   if (Modified)
1215     return DAL;
1216 
1217   delete DAL;
1218   return nullptr;
1219 }
1220 
1221 // TODO: Currently argument values separated by space e.g.
1222 // -Xclang -mframe-pointer=no cannot be passed by -Xarch_. This should be
1223 // fixed.
1224 void ToolChain::TranslateXarchArgs(
1225     const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
1226     llvm::opt::DerivedArgList *DAL,
1227     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1228   const OptTable &Opts = getDriver().getOpts();
1229   unsigned ValuePos = 1;
1230   if (A->getOption().matches(options::OPT_Xarch_device) ||
1231       A->getOption().matches(options::OPT_Xarch_host))
1232     ValuePos = 0;
1233 
1234   unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(ValuePos));
1235   unsigned Prev = Index;
1236   std::unique_ptr<llvm::opt::Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1237 
1238   // If the argument parsing failed or more than one argument was
1239   // consumed, the -Xarch_ argument's parameter tried to consume
1240   // extra arguments. Emit an error and ignore.
1241   //
1242   // We also want to disallow any options which would alter the
1243   // driver behavior; that isn't going to work in our model. We
1244   // use options::NoXarchOption to control this.
1245   if (!XarchArg || Index > Prev + 1) {
1246     getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1247         << A->getAsString(Args);
1248     return;
1249   } else if (XarchArg->getOption().hasFlag(options::NoXarchOption)) {
1250     auto &Diags = getDriver().getDiags();
1251     unsigned DiagID =
1252         Diags.getCustomDiagID(DiagnosticsEngine::Error,
1253                               "invalid Xarch argument: '%0', not all driver "
1254                               "options can be forwared via Xarch argument");
1255     Diags.Report(DiagID) << A->getAsString(Args);
1256     return;
1257   }
1258   XarchArg->setBaseArg(A);
1259   A = XarchArg.release();
1260   if (!AllocatedArgs)
1261     DAL->AddSynthesizedArg(A);
1262   else
1263     AllocatedArgs->push_back(A);
1264 }
1265 
1266 llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1267     const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1268     Action::OffloadKind OFK,
1269     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1270   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1271   bool Modified = false;
1272 
1273   bool IsGPU = OFK == Action::OFK_Cuda || OFK == Action::OFK_HIP;
1274   for (Arg *A : Args) {
1275     bool NeedTrans = false;
1276     bool Skip = false;
1277     if (A->getOption().matches(options::OPT_Xarch_device)) {
1278       NeedTrans = IsGPU;
1279       Skip = !IsGPU;
1280     } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1281       NeedTrans = !IsGPU;
1282       Skip = IsGPU;
1283     } else if (A->getOption().matches(options::OPT_Xarch__) && IsGPU) {
1284       // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1285       // they may need special translation.
1286       // Skip this argument unless the architecture matches BoundArch
1287       if (BoundArch.empty() || A->getValue(0) != BoundArch)
1288         Skip = true;
1289       else
1290         NeedTrans = true;
1291     }
1292     if (NeedTrans || Skip)
1293       Modified = true;
1294     if (NeedTrans)
1295       TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1296     if (!Skip)
1297       DAL->append(A);
1298   }
1299 
1300   if (Modified)
1301     return DAL;
1302 
1303   delete DAL;
1304   return nullptr;
1305 }
1306