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 and DriverKit.
71   bool NoRTTI = Triple.isPS4() || Triple.isDriverKit();
72   return NoRTTI ? ToolChain::RM_Disabled : ToolChain::RM_Enabled;
73 }
74 
75 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
76                      const ArgList &Args)
77     : D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
78       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
79   auto addIfExists = [this](path_list &List, const std::string &Path) {
80     if (getVFS().exists(Path))
81       List.push_back(Path);
82   };
83 
84   for (const auto &Path : getRuntimePaths())
85     addIfExists(getLibraryPaths(), Path);
86   for (const auto &Path : getStdlibPaths())
87     addIfExists(getFilePaths(), Path);
88   addIfExists(getFilePaths(), getArchSpecificLibPath());
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::defaultToIEEELongDouble() const {
114   return PPC_LINUX_DEFAULT_IEEELONGDOUBLE && getTriple().isOSLinux();
115 }
116 
117 SanitizerArgs
118 ToolChain::getSanitizerArgs(const llvm::opt::ArgList &JobArgs) const {
119   SanitizerArgs SanArgs(*this, JobArgs, !SanitizerArgsChecked);
120   SanitizerArgsChecked = true;
121   return SanArgs;
122 }
123 
124 const XRayArgs& ToolChain::getXRayArgs() const {
125   if (!XRayArguments.get())
126     XRayArguments.reset(new XRayArgs(*this, Args));
127   return *XRayArguments.get();
128 }
129 
130 namespace {
131 
132 struct DriverSuffix {
133   const char *Suffix;
134   const char *ModeFlag;
135 };
136 
137 } // namespace
138 
139 static const DriverSuffix *FindDriverSuffix(StringRef ProgName, size_t &Pos) {
140   // A list of known driver suffixes. Suffixes are compared against the
141   // program name in order. If there is a match, the frontend type is updated as
142   // necessary by applying the ModeFlag.
143   static const DriverSuffix DriverSuffixes[] = {
144       {"clang", nullptr},
145       {"clang++", "--driver-mode=g++"},
146       {"clang-c++", "--driver-mode=g++"},
147       {"clang-cc", nullptr},
148       {"clang-cpp", "--driver-mode=cpp"},
149       {"clang-g++", "--driver-mode=g++"},
150       {"clang-gcc", nullptr},
151       {"clang-cl", "--driver-mode=cl"},
152       {"cc", nullptr},
153       {"cpp", "--driver-mode=cpp"},
154       {"cl", "--driver-mode=cl"},
155       {"++", "--driver-mode=g++"},
156       {"flang", "--driver-mode=flang"},
157       {"clang-dxc", "--driver-mode=dxc"},
158   };
159 
160   for (size_t i = 0; i < llvm::array_lengthof(DriverSuffixes); ++i) {
161     StringRef Suffix(DriverSuffixes[i].Suffix);
162     if (ProgName.endswith(Suffix)) {
163       Pos = ProgName.size() - Suffix.size();
164       return &DriverSuffixes[i];
165     }
166   }
167   return nullptr;
168 }
169 
170 /// Normalize the program name from argv[0] by stripping the file extension if
171 /// present and lower-casing the string on Windows.
172 static std::string normalizeProgramName(llvm::StringRef Argv0) {
173   std::string ProgName = std::string(llvm::sys::path::stem(Argv0));
174   if (is_style_windows(llvm::sys::path::Style::native)) {
175     // Transform to lowercase for case insensitive file systems.
176     std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(),
177                    ::tolower);
178   }
179   return ProgName;
180 }
181 
182 static const DriverSuffix *parseDriverSuffix(StringRef ProgName, size_t &Pos) {
183   // Try to infer frontend type and default target from the program name by
184   // comparing it against DriverSuffixes in order.
185 
186   // If there is a match, the function tries to identify a target as prefix.
187   // E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
188   // prefix "x86_64-linux". If such a target prefix is found, it may be
189   // added via -target as implicit first argument.
190   const DriverSuffix *DS = FindDriverSuffix(ProgName, Pos);
191 
192   if (!DS) {
193     // Try again after stripping any trailing version number:
194     // clang++3.5 -> clang++
195     ProgName = ProgName.rtrim("0123456789.");
196     DS = FindDriverSuffix(ProgName, Pos);
197   }
198 
199   if (!DS) {
200     // Try again after stripping trailing -component.
201     // clang++-tot -> clang++
202     ProgName = ProgName.slice(0, ProgName.rfind('-'));
203     DS = FindDriverSuffix(ProgName, Pos);
204   }
205   return DS;
206 }
207 
208 ParsedClangName
209 ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
210   std::string ProgName = normalizeProgramName(PN);
211   size_t SuffixPos;
212   const DriverSuffix *DS = parseDriverSuffix(ProgName, SuffixPos);
213   if (!DS)
214     return {};
215   size_t SuffixEnd = SuffixPos + strlen(DS->Suffix);
216 
217   size_t LastComponent = ProgName.rfind('-', SuffixPos);
218   if (LastComponent == std::string::npos)
219     return ParsedClangName(ProgName.substr(0, SuffixEnd), DS->ModeFlag);
220   std::string ModeSuffix = ProgName.substr(LastComponent + 1,
221                                            SuffixEnd - LastComponent - 1);
222 
223   // Infer target from the prefix.
224   StringRef Prefix(ProgName);
225   Prefix = Prefix.slice(0, LastComponent);
226   std::string IgnoredError;
227   bool IsRegistered =
228       llvm::TargetRegistry::lookupTarget(std::string(Prefix), IgnoredError);
229   return ParsedClangName{std::string(Prefix), ModeSuffix, DS->ModeFlag,
230                          IsRegistered};
231 }
232 
233 StringRef ToolChain::getDefaultUniversalArchName() const {
234   // In universal driver terms, the arch name accepted by -arch isn't exactly
235   // the same as the ones that appear in the triple. Roughly speaking, this is
236   // an inverse of the darwin::getArchTypeForDarwinArchName() function.
237   switch (Triple.getArch()) {
238   case llvm::Triple::aarch64: {
239     if (getTriple().isArm64e())
240       return "arm64e";
241     return "arm64";
242   }
243   case llvm::Triple::aarch64_32:
244     return "arm64_32";
245   case llvm::Triple::ppc:
246     return "ppc";
247   case llvm::Triple::ppcle:
248     return "ppcle";
249   case llvm::Triple::ppc64:
250     return "ppc64";
251   case llvm::Triple::ppc64le:
252     return "ppc64le";
253   default:
254     return Triple.getArchName();
255   }
256 }
257 
258 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
259   return Input.getFilename();
260 }
261 
262 bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
263   return false;
264 }
265 
266 Tool *ToolChain::getClang() const {
267   if (!Clang)
268     Clang.reset(new tools::Clang(*this, useIntegratedBackend()));
269   return Clang.get();
270 }
271 
272 Tool *ToolChain::getFlang() const {
273   if (!Flang)
274     Flang.reset(new tools::Flang(*this));
275   return Flang.get();
276 }
277 
278 Tool *ToolChain::buildAssembler() const {
279   return new tools::ClangAs(*this);
280 }
281 
282 Tool *ToolChain::buildLinker() const {
283   llvm_unreachable("Linking is not supported by this toolchain");
284 }
285 
286 Tool *ToolChain::buildStaticLibTool() const {
287   llvm_unreachable("Creating static lib is not supported by this toolchain");
288 }
289 
290 Tool *ToolChain::getAssemble() const {
291   if (!Assemble)
292     Assemble.reset(buildAssembler());
293   return Assemble.get();
294 }
295 
296 Tool *ToolChain::getClangAs() const {
297   if (!Assemble)
298     Assemble.reset(new tools::ClangAs(*this));
299   return Assemble.get();
300 }
301 
302 Tool *ToolChain::getLink() const {
303   if (!Link)
304     Link.reset(buildLinker());
305   return Link.get();
306 }
307 
308 Tool *ToolChain::getStaticLibTool() const {
309   if (!StaticLibTool)
310     StaticLibTool.reset(buildStaticLibTool());
311   return StaticLibTool.get();
312 }
313 
314 Tool *ToolChain::getIfsMerge() const {
315   if (!IfsMerge)
316     IfsMerge.reset(new tools::ifstool::Merger(*this));
317   return IfsMerge.get();
318 }
319 
320 Tool *ToolChain::getOffloadBundler() const {
321   if (!OffloadBundler)
322     OffloadBundler.reset(new tools::OffloadBundler(*this));
323   return OffloadBundler.get();
324 }
325 
326 Tool *ToolChain::getOffloadWrapper() const {
327   if (!OffloadWrapper)
328     OffloadWrapper.reset(new tools::OffloadWrapper(*this));
329   return OffloadWrapper.get();
330 }
331 
332 Tool *ToolChain::getOffloadPackager() const {
333   if (!OffloadPackager)
334     OffloadPackager.reset(new tools::OffloadPackager(*this));
335   return OffloadPackager.get();
336 }
337 
338 Tool *ToolChain::getLinkerWrapper() const {
339   if (!LinkerWrapper)
340     LinkerWrapper.reset(new tools::LinkerWrapper(*this, getLink()));
341   return LinkerWrapper.get();
342 }
343 
344 Tool *ToolChain::getTool(Action::ActionClass AC) const {
345   switch (AC) {
346   case Action::AssembleJobClass:
347     return getAssemble();
348 
349   case Action::IfsMergeJobClass:
350     return getIfsMerge();
351 
352   case Action::LinkJobClass:
353     return getLink();
354 
355   case Action::StaticLibJobClass:
356     return getStaticLibTool();
357 
358   case Action::InputClass:
359   case Action::BindArchClass:
360   case Action::OffloadClass:
361   case Action::LipoJobClass:
362   case Action::DsymutilJobClass:
363   case Action::VerifyDebugInfoJobClass:
364     llvm_unreachable("Invalid tool kind.");
365 
366   case Action::CompileJobClass:
367   case Action::PrecompileJobClass:
368   case Action::HeaderModulePrecompileJobClass:
369   case Action::PreprocessJobClass:
370   case Action::ExtractAPIJobClass:
371   case Action::AnalyzeJobClass:
372   case Action::MigrateJobClass:
373   case Action::VerifyPCHJobClass:
374   case Action::BackendJobClass:
375     return getClang();
376 
377   case Action::OffloadBundlingJobClass:
378   case Action::OffloadUnbundlingJobClass:
379     return getOffloadBundler();
380 
381   case Action::OffloadWrapperJobClass:
382     return getOffloadWrapper();
383   case Action::OffloadPackagerJobClass:
384     return getOffloadPackager();
385   case Action::LinkerWrapperJobClass:
386     return getLinkerWrapper();
387   }
388 
389   llvm_unreachable("Invalid tool kind.");
390 }
391 
392 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
393                                              const ArgList &Args) {
394   const llvm::Triple &Triple = TC.getTriple();
395   bool IsWindows = Triple.isOSWindows();
396 
397   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
398     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
399                ? "armhf"
400                : "arm";
401 
402   // For historic reasons, Android library is using i686 instead of i386.
403   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
404     return "i686";
405 
406   if (TC.getArch() == llvm::Triple::x86_64 && Triple.isX32())
407     return "x32";
408 
409   return llvm::Triple::getArchTypeName(TC.getArch());
410 }
411 
412 StringRef ToolChain::getOSLibName() const {
413   if (Triple.isOSDarwin())
414     return "darwin";
415 
416   switch (Triple.getOS()) {
417   case llvm::Triple::FreeBSD:
418     return "freebsd";
419   case llvm::Triple::NetBSD:
420     return "netbsd";
421   case llvm::Triple::OpenBSD:
422     return "openbsd";
423   case llvm::Triple::Solaris:
424     return "sunos";
425   case llvm::Triple::AIX:
426     return "aix";
427   default:
428     return getOS();
429   }
430 }
431 
432 std::string ToolChain::getCompilerRTPath() const {
433   SmallString<128> Path(getDriver().ResourceDir);
434   if (Triple.isOSUnknown()) {
435     llvm::sys::path::append(Path, "lib");
436   } else {
437     llvm::sys::path::append(Path, "lib", getOSLibName());
438   }
439   return std::string(Path.str());
440 }
441 
442 std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
443                                              StringRef Component,
444                                              FileType Type) const {
445   std::string CRTAbsolutePath = getCompilerRT(Args, Component, Type);
446   return llvm::sys::path::filename(CRTAbsolutePath).str();
447 }
448 
449 std::string ToolChain::buildCompilerRTBasename(const llvm::opt::ArgList &Args,
450                                                StringRef Component,
451                                                FileType Type,
452                                                bool AddArch) const {
453   const llvm::Triple &TT = getTriple();
454   bool IsITANMSVCWindows =
455       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
456 
457   const char *Prefix =
458       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
459   const char *Suffix;
460   switch (Type) {
461   case ToolChain::FT_Object:
462     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
463     break;
464   case ToolChain::FT_Static:
465     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
466     break;
467   case ToolChain::FT_Shared:
468     Suffix = TT.isOSWindows()
469                  ? (TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
470                  : ".so";
471     break;
472   }
473 
474   std::string ArchAndEnv;
475   if (AddArch) {
476     StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
477     const char *Env = TT.isAndroid() ? "-android" : "";
478     ArchAndEnv = ("-" + Arch + Env).str();
479   }
480   return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
481 }
482 
483 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
484                                      FileType Type) const {
485   // Check for runtime files in the new layout without the architecture first.
486   std::string CRTBasename =
487       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
488   for (const auto &LibPath : getLibraryPaths()) {
489     SmallString<128> P(LibPath);
490     llvm::sys::path::append(P, CRTBasename);
491     if (getVFS().exists(P))
492       return std::string(P.str());
493   }
494 
495   // Fall back to the old expected compiler-rt name if the new one does not
496   // exist.
497   CRTBasename =
498       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
499   SmallString<128> Path(getCompilerRTPath());
500   llvm::sys::path::append(Path, CRTBasename);
501   return std::string(Path.str());
502 }
503 
504 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
505                                               StringRef Component,
506                                               FileType Type) const {
507   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
508 }
509 
510 ToolChain::path_list ToolChain::getRuntimePaths() const {
511   path_list Paths;
512   auto addPathForTriple = [this, &Paths](const llvm::Triple &Triple) {
513     SmallString<128> P(D.ResourceDir);
514     llvm::sys::path::append(P, "lib", Triple.str());
515     Paths.push_back(std::string(P.str()));
516   };
517 
518   addPathForTriple(getTriple());
519 
520   // Android targets may include an API level at the end. We still want to fall
521   // back on a path without the API level.
522   if (getTriple().isAndroid() &&
523       getTriple().getEnvironmentName() != "android") {
524     llvm::Triple TripleWithoutLevel = getTriple();
525     TripleWithoutLevel.setEnvironmentName("android");
526     addPathForTriple(TripleWithoutLevel);
527   }
528 
529   return Paths;
530 }
531 
532 ToolChain::path_list ToolChain::getStdlibPaths() const {
533   path_list Paths;
534   SmallString<128> P(D.Dir);
535   llvm::sys::path::append(P, "..", "lib", getTripleString());
536   Paths.push_back(std::string(P.str()));
537 
538   return Paths;
539 }
540 
541 std::string ToolChain::getArchSpecificLibPath() const {
542   SmallString<128> Path(getDriver().ResourceDir);
543   llvm::sys::path::append(Path, "lib", getOSLibName(),
544                           llvm::Triple::getArchTypeName(getArch()));
545   return std::string(Path.str());
546 }
547 
548 bool ToolChain::needsProfileRT(const ArgList &Args) {
549   if (Args.hasArg(options::OPT_noprofilelib))
550     return false;
551 
552   return Args.hasArg(options::OPT_fprofile_generate) ||
553          Args.hasArg(options::OPT_fprofile_generate_EQ) ||
554          Args.hasArg(options::OPT_fcs_profile_generate) ||
555          Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
556          Args.hasArg(options::OPT_fprofile_instr_generate) ||
557          Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
558          Args.hasArg(options::OPT_fcreate_profile) ||
559          Args.hasArg(options::OPT_forder_file_instrumentation);
560 }
561 
562 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
563   return Args.hasArg(options::OPT_coverage) ||
564          Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
565                       false);
566 }
567 
568 Tool *ToolChain::SelectTool(const JobAction &JA) const {
569   if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
570   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
571   Action::ActionClass AC = JA.getKind();
572   if (AC == Action::AssembleJobClass && useIntegratedAs())
573     return getClangAs();
574   return getTool(AC);
575 }
576 
577 std::string ToolChain::GetFilePath(const char *Name) const {
578   return D.GetFilePath(Name, *this);
579 }
580 
581 std::string ToolChain::GetProgramPath(const char *Name) const {
582   return D.GetProgramPath(Name, *this);
583 }
584 
585 std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD) const {
586   if (LinkerIsLLD)
587     *LinkerIsLLD = false;
588 
589   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
590   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
591   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
592   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
593 
594   // --ld-path= takes precedence over -fuse-ld= and specifies the executable
595   // name. -B, COMPILER_PATH and PATH and consulted if the value does not
596   // contain a path component separator.
597   if (const Arg *A = Args.getLastArg(options::OPT_ld_path_EQ)) {
598     std::string Path(A->getValue());
599     if (!Path.empty()) {
600       if (llvm::sys::path::parent_path(Path).empty())
601         Path = GetProgramPath(A->getValue());
602       if (llvm::sys::fs::can_execute(Path))
603         return std::string(Path);
604     }
605     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
606     return GetProgramPath(getDefaultLinker());
607   }
608   // If we're passed -fuse-ld= with no argument, or with the argument ld,
609   // then use whatever the default system linker is.
610   if (UseLinker.empty() || UseLinker == "ld") {
611     const char *DefaultLinker = getDefaultLinker();
612     if (llvm::sys::path::is_absolute(DefaultLinker))
613       return std::string(DefaultLinker);
614     else
615       return GetProgramPath(DefaultLinker);
616   }
617 
618   // Extending -fuse-ld= to an absolute or relative path is unexpected. Checking
619   // for the linker flavor is brittle. In addition, prepending "ld." or "ld64."
620   // to a relative path is surprising. This is more complex due to priorities
621   // among -B, COMPILER_PATH and PATH. --ld-path= should be used instead.
622   if (UseLinker.contains('/'))
623     getDriver().Diag(diag::warn_drv_fuse_ld_path);
624 
625   if (llvm::sys::path::is_absolute(UseLinker)) {
626     // If we're passed what looks like an absolute path, don't attempt to
627     // second-guess that.
628     if (llvm::sys::fs::can_execute(UseLinker))
629       return std::string(UseLinker);
630   } else {
631     llvm::SmallString<8> LinkerName;
632     if (Triple.isOSDarwin())
633       LinkerName.append("ld64.");
634     else
635       LinkerName.append("ld.");
636     LinkerName.append(UseLinker);
637 
638     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
639     if (llvm::sys::fs::can_execute(LinkerPath)) {
640       if (LinkerIsLLD)
641         *LinkerIsLLD = UseLinker == "lld";
642       return LinkerPath;
643     }
644   }
645 
646   if (A)
647     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
648 
649   return GetProgramPath(getDefaultLinker());
650 }
651 
652 std::string ToolChain::GetStaticLibToolPath() const {
653   // TODO: Add support for static lib archiving on Windows
654   if (Triple.isOSDarwin())
655     return GetProgramPath("libtool");
656   return GetProgramPath("llvm-ar");
657 }
658 
659 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
660   types::ID id = types::lookupTypeForExtension(Ext);
661 
662   // Flang always runs the preprocessor and has no notion of "preprocessed
663   // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
664   // them differently.
665   if (D.IsFlangMode() && id == types::TY_PP_Fortran)
666     id = types::TY_Fortran;
667 
668   return id;
669 }
670 
671 bool ToolChain::HasNativeLLVMSupport() const {
672   return false;
673 }
674 
675 bool ToolChain::isCrossCompiling() const {
676   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
677   switch (HostTriple.getArch()) {
678   // The A32/T32/T16 instruction sets are not separate architectures in this
679   // context.
680   case llvm::Triple::arm:
681   case llvm::Triple::armeb:
682   case llvm::Triple::thumb:
683   case llvm::Triple::thumbeb:
684     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
685            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
686   default:
687     return HostTriple.getArch() != getArch();
688   }
689 }
690 
691 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
692   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
693                      VersionTuple());
694 }
695 
696 llvm::ExceptionHandling
697 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
698   return llvm::ExceptionHandling::None;
699 }
700 
701 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
702   if (Model == "single") {
703     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
704     return Triple.getArch() == llvm::Triple::arm ||
705            Triple.getArch() == llvm::Triple::armeb ||
706            Triple.getArch() == llvm::Triple::thumb ||
707            Triple.getArch() == llvm::Triple::thumbeb || Triple.isWasm();
708   } else if (Model == "posix")
709     return true;
710 
711   return false;
712 }
713 
714 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
715                                          types::ID InputType) const {
716   switch (getTriple().getArch()) {
717   default:
718     return getTripleString();
719 
720   case llvm::Triple::x86_64: {
721     llvm::Triple Triple = getTriple();
722     if (!Triple.isOSBinFormatMachO())
723       return getTripleString();
724 
725     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
726       // x86_64h goes in the triple. Other -march options just use the
727       // vanilla triple we already have.
728       StringRef MArch = A->getValue();
729       if (MArch == "x86_64h")
730         Triple.setArchName(MArch);
731     }
732     return Triple.getTriple();
733   }
734   case llvm::Triple::aarch64: {
735     llvm::Triple Triple = getTriple();
736     if (!Triple.isOSBinFormatMachO())
737       return getTripleString();
738 
739     if (Triple.isArm64e())
740       return getTripleString();
741 
742     // FIXME: older versions of ld64 expect the "arm64" component in the actual
743     // triple string and query it to determine whether an LTO file can be
744     // handled. Remove this when we don't care any more.
745     Triple.setArchName("arm64");
746     return Triple.getTriple();
747   }
748   case llvm::Triple::aarch64_32:
749     return getTripleString();
750   case llvm::Triple::arm:
751   case llvm::Triple::armeb:
752   case llvm::Triple::thumb:
753   case llvm::Triple::thumbeb: {
754     llvm::Triple Triple = getTriple();
755     tools::arm::setArchNameInTriple(getDriver(), Args, InputType, Triple);
756     tools::arm::setFloatABIInTriple(getDriver(), Args, Triple);
757     return Triple.getTriple();
758   }
759   }
760 }
761 
762 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
763                                                    types::ID InputType) const {
764   return ComputeLLVMTriple(Args, InputType);
765 }
766 
767 std::string ToolChain::computeSysRoot() const {
768   return D.SysRoot;
769 }
770 
771 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
772                                           ArgStringList &CC1Args) const {
773   // Each toolchain should provide the appropriate include flags.
774 }
775 
776 void ToolChain::addClangTargetOptions(
777     const ArgList &DriverArgs, ArgStringList &CC1Args,
778     Action::OffloadKind DeviceOffloadKind) const {}
779 
780 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
781 
782 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
783                                  llvm::opt::ArgStringList &CmdArgs) const {
784   if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
785     return;
786 
787   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
788 }
789 
790 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
791     const ArgList &Args) const {
792   if (runtimeLibType)
793     return *runtimeLibType;
794 
795   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
796   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
797 
798   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
799   if (LibName == "compiler-rt")
800     runtimeLibType = ToolChain::RLT_CompilerRT;
801   else if (LibName == "libgcc")
802     runtimeLibType = ToolChain::RLT_Libgcc;
803   else if (LibName == "platform")
804     runtimeLibType = GetDefaultRuntimeLibType();
805   else {
806     if (A)
807       getDriver().Diag(diag::err_drv_invalid_rtlib_name)
808           << A->getAsString(Args);
809 
810     runtimeLibType = GetDefaultRuntimeLibType();
811   }
812 
813   return *runtimeLibType;
814 }
815 
816 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
817     const ArgList &Args) const {
818   if (unwindLibType)
819     return *unwindLibType;
820 
821   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
822   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
823 
824   if (LibName == "none")
825     unwindLibType = ToolChain::UNW_None;
826   else if (LibName == "platform" || LibName == "") {
827     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
828     if (RtLibType == ToolChain::RLT_CompilerRT) {
829       if (getTriple().isAndroid() || getTriple().isOSAIX())
830         unwindLibType = ToolChain::UNW_CompilerRT;
831       else
832         unwindLibType = ToolChain::UNW_None;
833     } else if (RtLibType == ToolChain::RLT_Libgcc)
834       unwindLibType = ToolChain::UNW_Libgcc;
835   } else if (LibName == "libunwind") {
836     if (GetRuntimeLibType(Args) == RLT_Libgcc)
837       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
838     unwindLibType = ToolChain::UNW_CompilerRT;
839   } else if (LibName == "libgcc")
840     unwindLibType = ToolChain::UNW_Libgcc;
841   else {
842     if (A)
843       getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
844           << A->getAsString(Args);
845 
846     unwindLibType = GetDefaultUnwindLibType();
847   }
848 
849   return *unwindLibType;
850 }
851 
852 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
853   if (cxxStdlibType)
854     return *cxxStdlibType;
855 
856   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
857   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
858 
859   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
860   if (LibName == "libc++")
861     cxxStdlibType = ToolChain::CST_Libcxx;
862   else if (LibName == "libstdc++")
863     cxxStdlibType = ToolChain::CST_Libstdcxx;
864   else if (LibName == "platform")
865     cxxStdlibType = GetDefaultCXXStdlibType();
866   else {
867     if (A)
868       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
869           << A->getAsString(Args);
870 
871     cxxStdlibType = GetDefaultCXXStdlibType();
872   }
873 
874   return *cxxStdlibType;
875 }
876 
877 /// Utility function to add a system include directory to CC1 arguments.
878 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
879                                             ArgStringList &CC1Args,
880                                             const Twine &Path) {
881   CC1Args.push_back("-internal-isystem");
882   CC1Args.push_back(DriverArgs.MakeArgString(Path));
883 }
884 
885 /// Utility function to add a system include directory with extern "C"
886 /// semantics to CC1 arguments.
887 ///
888 /// Note that this should be used rarely, and only for directories that
889 /// historically and for legacy reasons are treated as having implicit extern
890 /// "C" semantics. These semantics are *ignored* by and large today, but its
891 /// important to preserve the preprocessor changes resulting from the
892 /// classification.
893 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
894                                                    ArgStringList &CC1Args,
895                                                    const Twine &Path) {
896   CC1Args.push_back("-internal-externc-isystem");
897   CC1Args.push_back(DriverArgs.MakeArgString(Path));
898 }
899 
900 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
901                                                 ArgStringList &CC1Args,
902                                                 const Twine &Path) {
903   if (llvm::sys::fs::exists(Path))
904     addExternCSystemInclude(DriverArgs, CC1Args, Path);
905 }
906 
907 /// Utility function to add a list of system include directories to CC1.
908 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
909                                              ArgStringList &CC1Args,
910                                              ArrayRef<StringRef> Paths) {
911   for (const auto &Path : Paths) {
912     CC1Args.push_back("-internal-isystem");
913     CC1Args.push_back(DriverArgs.MakeArgString(Path));
914   }
915 }
916 
917 std::string ToolChain::detectLibcxxVersion(StringRef IncludePath) const {
918   std::error_code EC;
919   int MaxVersion = 0;
920   std::string MaxVersionString;
921   SmallString<128> Path(IncludePath);
922   llvm::sys::path::append(Path, "c++");
923   for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(Path, EC), LE;
924        !EC && LI != LE; LI = LI.increment(EC)) {
925     StringRef VersionText = llvm::sys::path::filename(LI->path());
926     int Version;
927     if (VersionText[0] == 'v' &&
928         !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
929       if (Version > MaxVersion) {
930         MaxVersion = Version;
931         MaxVersionString = std::string(VersionText);
932       }
933     }
934   }
935   if (!MaxVersion)
936     return "";
937   return MaxVersionString;
938 }
939 
940 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
941                                              ArgStringList &CC1Args) const {
942   // Header search paths should be handled by each of the subclasses.
943   // Historically, they have not been, and instead have been handled inside of
944   // the CC1-layer frontend. As the logic is hoisted out, this generic function
945   // will slowly stop being called.
946   //
947   // While it is being called, replicate a bit of a hack to propagate the
948   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
949   // header search paths with it. Once all systems are overriding this
950   // function, the CC1 flag and this line can be removed.
951   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
952 }
953 
954 void ToolChain::AddClangCXXStdlibIsystemArgs(
955     const llvm::opt::ArgList &DriverArgs,
956     llvm::opt::ArgStringList &CC1Args) const {
957   DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
958   if (!DriverArgs.hasArg(options::OPT_nostdinc, options::OPT_nostdincxx,
959                          options::OPT_nostdlibinc))
960     for (const auto &P :
961          DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
962       addSystemInclude(DriverArgs, CC1Args, P);
963 }
964 
965 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
966   return getDriver().CCCIsCXX() &&
967          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
968                       options::OPT_nostdlibxx);
969 }
970 
971 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
972                                     ArgStringList &CmdArgs) const {
973   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
974          "should not have called this");
975   CXXStdlibType Type = GetCXXStdlibType(Args);
976 
977   switch (Type) {
978   case ToolChain::CST_Libcxx:
979     CmdArgs.push_back("-lc++");
980     break;
981 
982   case ToolChain::CST_Libstdcxx:
983     CmdArgs.push_back("-lstdc++");
984     break;
985   }
986 }
987 
988 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
989                                    ArgStringList &CmdArgs) const {
990   for (const auto &LibPath : getFilePaths())
991     if(LibPath.length() > 0)
992       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
993 }
994 
995 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
996                                  ArgStringList &CmdArgs) const {
997   CmdArgs.push_back("-lcc_kext");
998 }
999 
1000 bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
1001                                            std::string &Path) const {
1002   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
1003   // (to keep the linker options consistent with gcc and clang itself).
1004   if (!isOptimizationLevelFast(Args)) {
1005     // Check if -ffast-math or -funsafe-math.
1006     Arg *A =
1007       Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
1008                       options::OPT_funsafe_math_optimizations,
1009                       options::OPT_fno_unsafe_math_optimizations);
1010 
1011     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
1012         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
1013       return false;
1014   }
1015   // If crtfastmath.o exists add it to the arguments.
1016   Path = GetFilePath("crtfastmath.o");
1017   return (Path != "crtfastmath.o"); // Not found.
1018 }
1019 
1020 bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
1021                                               ArgStringList &CmdArgs) const {
1022   std::string Path;
1023   if (isFastMathRuntimeAvailable(Args, Path)) {
1024     CmdArgs.push_back(Args.MakeArgString(Path));
1025     return true;
1026   }
1027 
1028   return false;
1029 }
1030 
1031 SanitizerMask ToolChain::getSupportedSanitizers() const {
1032   // Return sanitizers which don't require runtime support and are not
1033   // platform dependent.
1034 
1035   SanitizerMask Res =
1036       (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
1037        ~SanitizerKind::Function) |
1038       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
1039       SanitizerKind::CFICastStrict | SanitizerKind::FloatDivideByZero |
1040       SanitizerKind::UnsignedIntegerOverflow |
1041       SanitizerKind::UnsignedShiftBase | SanitizerKind::ImplicitConversion |
1042       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1043   if (getTriple().getArch() == llvm::Triple::x86 ||
1044       getTriple().getArch() == llvm::Triple::x86_64 ||
1045       getTriple().getArch() == llvm::Triple::arm || getTriple().isWasm() ||
1046       getTriple().isAArch64() || getTriple().isRISCV())
1047     Res |= SanitizerKind::CFIICall;
1048   if (getTriple().getArch() == llvm::Triple::x86_64 ||
1049       getTriple().isAArch64(64) || getTriple().isRISCV())
1050     Res |= SanitizerKind::ShadowCallStack;
1051   if (getTriple().isAArch64(64))
1052     Res |= SanitizerKind::MemTag;
1053   return Res;
1054 }
1055 
1056 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1057                                    ArgStringList &CC1Args) const {}
1058 
1059 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1060                                   ArgStringList &CC1Args) const {}
1061 
1062 llvm::SmallVector<ToolChain::BitCodeLibraryInfo, 12>
1063 ToolChain::getHIPDeviceLibs(const ArgList &DriverArgs) const {
1064   return {};
1065 }
1066 
1067 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1068                                     ArgStringList &CC1Args) const {}
1069 
1070 static VersionTuple separateMSVCFullVersion(unsigned Version) {
1071   if (Version < 100)
1072     return VersionTuple(Version);
1073 
1074   if (Version < 10000)
1075     return VersionTuple(Version / 100, Version % 100);
1076 
1077   unsigned Build = 0, Factor = 1;
1078   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
1079     Build = Build + (Version % 10) * Factor;
1080   return VersionTuple(Version / 100, Version % 100, Build);
1081 }
1082 
1083 VersionTuple
1084 ToolChain::computeMSVCVersion(const Driver *D,
1085                               const llvm::opt::ArgList &Args) const {
1086   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
1087   const Arg *MSCompatibilityVersion =
1088       Args.getLastArg(options::OPT_fms_compatibility_version);
1089 
1090   if (MSCVersion && MSCompatibilityVersion) {
1091     if (D)
1092       D->Diag(diag::err_drv_argument_not_allowed_with)
1093           << MSCVersion->getAsString(Args)
1094           << MSCompatibilityVersion->getAsString(Args);
1095     return VersionTuple();
1096   }
1097 
1098   if (MSCompatibilityVersion) {
1099     VersionTuple MSVT;
1100     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
1101       if (D)
1102         D->Diag(diag::err_drv_invalid_value)
1103             << MSCompatibilityVersion->getAsString(Args)
1104             << MSCompatibilityVersion->getValue();
1105     } else {
1106       return MSVT;
1107     }
1108   }
1109 
1110   if (MSCVersion) {
1111     unsigned Version = 0;
1112     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
1113       if (D)
1114         D->Diag(diag::err_drv_invalid_value)
1115             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
1116     } else {
1117       return separateMSVCFullVersion(Version);
1118     }
1119   }
1120 
1121   return VersionTuple();
1122 }
1123 
1124 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
1125     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
1126     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
1127   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1128   const OptTable &Opts = getDriver().getOpts();
1129   bool Modified = false;
1130 
1131   // Handle -Xopenmp-target flags
1132   for (auto *A : Args) {
1133     // Exclude flags which may only apply to the host toolchain.
1134     // Do not exclude flags when the host triple (AuxTriple)
1135     // matches the current toolchain triple. If it is not present
1136     // at all, target and host share a toolchain.
1137     if (A->getOption().matches(options::OPT_m_Group)) {
1138       if (SameTripleAsHost)
1139         DAL->append(A);
1140       else
1141         Modified = true;
1142       continue;
1143     }
1144 
1145     unsigned Index;
1146     unsigned Prev;
1147     bool XOpenMPTargetNoTriple =
1148         A->getOption().matches(options::OPT_Xopenmp_target);
1149 
1150     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
1151       llvm::Triple TT(getOpenMPTriple(A->getValue(0)));
1152 
1153       // Passing device args: -Xopenmp-target=<triple> -opt=val.
1154       if (TT.getTriple() == getTripleString())
1155         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1156       else
1157         continue;
1158     } else if (XOpenMPTargetNoTriple) {
1159       // Passing device args: -Xopenmp-target -opt=val.
1160       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
1161     } else {
1162       DAL->append(A);
1163       continue;
1164     }
1165 
1166     // Parse the argument to -Xopenmp-target.
1167     Prev = Index;
1168     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
1169     if (!XOpenMPTargetArg || Index > Prev + 1) {
1170       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
1171           << A->getAsString(Args);
1172       continue;
1173     }
1174     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
1175         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
1176       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
1177       continue;
1178     }
1179     XOpenMPTargetArg->setBaseArg(A);
1180     A = XOpenMPTargetArg.release();
1181     AllocatedArgs.push_back(A);
1182     DAL->append(A);
1183     Modified = true;
1184   }
1185 
1186   if (Modified)
1187     return DAL;
1188 
1189   delete DAL;
1190   return nullptr;
1191 }
1192 
1193 // TODO: Currently argument values separated by space e.g.
1194 // -Xclang -mframe-pointer=no cannot be passed by -Xarch_. This should be
1195 // fixed.
1196 void ToolChain::TranslateXarchArgs(
1197     const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
1198     llvm::opt::DerivedArgList *DAL,
1199     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1200   const OptTable &Opts = getDriver().getOpts();
1201   unsigned ValuePos = 1;
1202   if (A->getOption().matches(options::OPT_Xarch_device) ||
1203       A->getOption().matches(options::OPT_Xarch_host))
1204     ValuePos = 0;
1205 
1206   unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(ValuePos));
1207   unsigned Prev = Index;
1208   std::unique_ptr<llvm::opt::Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1209 
1210   // If the argument parsing failed or more than one argument was
1211   // consumed, the -Xarch_ argument's parameter tried to consume
1212   // extra arguments. Emit an error and ignore.
1213   //
1214   // We also want to disallow any options which would alter the
1215   // driver behavior; that isn't going to work in our model. We
1216   // use options::NoXarchOption to control this.
1217   if (!XarchArg || Index > Prev + 1) {
1218     getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1219         << A->getAsString(Args);
1220     return;
1221   } else if (XarchArg->getOption().hasFlag(options::NoXarchOption)) {
1222     auto &Diags = getDriver().getDiags();
1223     unsigned DiagID =
1224         Diags.getCustomDiagID(DiagnosticsEngine::Error,
1225                               "invalid Xarch argument: '%0', not all driver "
1226                               "options can be forwared via Xarch argument");
1227     Diags.Report(DiagID) << A->getAsString(Args);
1228     return;
1229   }
1230   XarchArg->setBaseArg(A);
1231   A = XarchArg.release();
1232   if (!AllocatedArgs)
1233     DAL->AddSynthesizedArg(A);
1234   else
1235     AllocatedArgs->push_back(A);
1236 }
1237 
1238 llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1239     const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1240     Action::OffloadKind OFK,
1241     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1242   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1243   bool Modified = false;
1244 
1245   bool IsGPU = OFK == Action::OFK_Cuda || OFK == Action::OFK_HIP;
1246   for (Arg *A : Args) {
1247     bool NeedTrans = false;
1248     bool Skip = false;
1249     if (A->getOption().matches(options::OPT_Xarch_device)) {
1250       NeedTrans = IsGPU;
1251       Skip = !IsGPU;
1252     } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1253       NeedTrans = !IsGPU;
1254       Skip = IsGPU;
1255     } else if (A->getOption().matches(options::OPT_Xarch__) && IsGPU) {
1256       // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1257       // they may need special translation.
1258       // Skip this argument unless the architecture matches BoundArch
1259       if (BoundArch.empty() || A->getValue(0) != BoundArch)
1260         Skip = true;
1261       else
1262         NeedTrans = true;
1263     }
1264     if (NeedTrans || Skip)
1265       Modified = true;
1266     if (NeedTrans)
1267       TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1268     if (!Skip)
1269       DAL->append(A);
1270   }
1271 
1272   if (Modified)
1273     return DAL;
1274 
1275   delete DAL;
1276   return nullptr;
1277 }
1278