xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChain.cpp (revision 6580f5c38dd5b01aeeaed16b370f1a12423437f0) 
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/AArch64.h"
11 #include "ToolChains/Arch/ARM.h"
12 #include "ToolChains/Clang.h"
13 #include "ToolChains/CommonArgs.h"
14 #include "ToolChains/Flang.h"
15 #include "ToolChains/InterfaceStubs.h"
16 #include "clang/Basic/ObjCRuntime.h"
17 #include "clang/Basic/Sanitizers.h"
18 #include "clang/Config/config.h"
19 #include "clang/Driver/Action.h"
20 #include "clang/Driver/Driver.h"
21 #include "clang/Driver/DriverDiagnostic.h"
22 #include "clang/Driver/InputInfo.h"
23 #include "clang/Driver/Job.h"
24 #include "clang/Driver/Options.h"
25 #include "clang/Driver/SanitizerArgs.h"
26 #include "clang/Driver/XRayArgs.h"
27 #include "llvm/ADT/STLExtras.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/ADT/StringRef.h"
31 #include "llvm/ADT/Twine.h"
32 #include "llvm/Config/llvm-config.h"
33 #include "llvm/MC/MCTargetOptions.h"
34 #include "llvm/MC/TargetRegistry.h"
35 #include "llvm/Option/Arg.h"
36 #include "llvm/Option/ArgList.h"
37 #include "llvm/Option/OptTable.h"
38 #include "llvm/Option/Option.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/FileSystem.h"
41 #include "llvm/Support/FileUtilities.h"
42 #include "llvm/Support/Path.h"
43 #include "llvm/Support/VersionTuple.h"
44 #include "llvm/Support/VirtualFileSystem.h"
45 #include "llvm/TargetParser/AArch64TargetParser.h"
46 #include "llvm/TargetParser/TargetParser.h"
47 #include "llvm/TargetParser/Triple.h"
48 #include <cassert>
49 #include <cstddef>
50 #include <cstring>
51 #include <string>
52 
53 using namespace clang;
54 using namespace driver;
55 using namespace tools;
56 using namespace llvm;
57 using namespace llvm::opt;
58 
59 static llvm::opt::Arg *GetRTTIArgument(const ArgList &Args) {
60   return Args.getLastArg(options::OPT_mkernel, options::OPT_fapple_kext,
61                          options::OPT_fno_rtti, options::OPT_frtti);
62 }
63 
64 static ToolChain::RTTIMode CalculateRTTIMode(const ArgList &Args,
65                                              const llvm::Triple &Triple,
66                                              const Arg *CachedRTTIArg) {
67   // Explicit rtti/no-rtti args
68   if (CachedRTTIArg) {
69     if (CachedRTTIArg->getOption().matches(options::OPT_frtti))
70       return ToolChain::RM_Enabled;
71     else
72       return ToolChain::RM_Disabled;
73   }
74 
75   // -frtti is default, except for the PS4/PS5 and DriverKit.
76   bool NoRTTI = Triple.isPS() || Triple.isDriverKit();
77   return NoRTTI ? ToolChain::RM_Disabled : ToolChain::RM_Enabled;
78 }
79 
80 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
81                      const ArgList &Args)
82     : D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
83       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
84   auto addIfExists = [this](path_list &List, const std::string &Path) {
85     if (getVFS().exists(Path))
86       List.push_back(Path);
87   };
88 
89   if (std::optional<std::string> Path = getRuntimePath())
90     getLibraryPaths().push_back(*Path);
91   if (std::optional<std::string> Path = getStdlibPath())
92     getFilePaths().push_back(*Path);
93   for (const auto &Path : getArchSpecificLibPaths())
94     addIfExists(getFilePaths(), Path);
95 }
96 
97 llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>>
98 ToolChain::executeToolChainProgram(StringRef Executable) const {
99   llvm::SmallString<64> OutputFile;
100   llvm::sys::fs::createTemporaryFile("toolchain-program", "txt", OutputFile);
101   llvm::FileRemover OutputRemover(OutputFile.c_str());
102   std::optional<llvm::StringRef> Redirects[] = {
103       {""},
104       OutputFile.str(),
105       {""},
106   };
107 
108   std::string ErrorMessage;
109   if (llvm::sys::ExecuteAndWait(Executable, {}, {}, Redirects,
110                                 /* SecondsToWait */ 0,
111                                 /*MemoryLimit*/ 0, &ErrorMessage))
112     return llvm::createStringError(std::error_code(),
113                                    Executable + ": " + ErrorMessage);
114 
115   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> OutputBuf =
116       llvm::MemoryBuffer::getFile(OutputFile.c_str());
117   if (!OutputBuf)
118     return llvm::createStringError(OutputBuf.getError(),
119                                    "Failed to read stdout of " + Executable +
120                                        ": " + OutputBuf.getError().message());
121   return std::move(*OutputBuf);
122 }
123 
124 void ToolChain::setTripleEnvironment(llvm::Triple::EnvironmentType Env) {
125   Triple.setEnvironment(Env);
126   if (EffectiveTriple != llvm::Triple())
127     EffectiveTriple.setEnvironment(Env);
128 }
129 
130 ToolChain::~ToolChain() = default;
131 
132 llvm::vfs::FileSystem &ToolChain::getVFS() const {
133   return getDriver().getVFS();
134 }
135 
136 bool ToolChain::useIntegratedAs() const {
137   return Args.hasFlag(options::OPT_fintegrated_as,
138                       options::OPT_fno_integrated_as,
139                       IsIntegratedAssemblerDefault());
140 }
141 
142 bool ToolChain::useIntegratedBackend() const {
143   assert(
144       ((IsIntegratedBackendDefault() && IsIntegratedBackendSupported()) ||
145        (!IsIntegratedBackendDefault() || IsNonIntegratedBackendSupported())) &&
146       "(Non-)integrated backend set incorrectly!");
147 
148   bool IBackend = Args.hasFlag(options::OPT_fintegrated_objemitter,
149                                options::OPT_fno_integrated_objemitter,
150                                IsIntegratedBackendDefault());
151 
152   // Diagnose when integrated-objemitter options are not supported by this
153   // toolchain.
154   unsigned DiagID;
155   if ((IBackend && !IsIntegratedBackendSupported()) ||
156       (!IBackend && !IsNonIntegratedBackendSupported()))
157     DiagID = clang::diag::err_drv_unsupported_opt_for_target;
158   else
159     DiagID = clang::diag::warn_drv_unsupported_opt_for_target;
160   Arg *A = Args.getLastArg(options::OPT_fno_integrated_objemitter);
161   if (A && !IsNonIntegratedBackendSupported())
162     D.Diag(DiagID) << A->getAsString(Args) << Triple.getTriple();
163   A = Args.getLastArg(options::OPT_fintegrated_objemitter);
164   if (A && !IsIntegratedBackendSupported())
165     D.Diag(DiagID) << A->getAsString(Args) << Triple.getTriple();
166 
167   return IBackend;
168 }
169 
170 bool ToolChain::useRelaxRelocations() const {
171   return ENABLE_X86_RELAX_RELOCATIONS;
172 }
173 
174 bool ToolChain::defaultToIEEELongDouble() const {
175   return PPC_LINUX_DEFAULT_IEEELONGDOUBLE && getTriple().isOSLinux();
176 }
177 
178 static void getAArch64MultilibFlags(const Driver &D,
179                                           const llvm::Triple &Triple,
180                                           const llvm::opt::ArgList &Args,
181                                           Multilib::flags_list &Result) {
182   std::vector<StringRef> Features;
183   tools::aarch64::getAArch64TargetFeatures(D, Triple, Args, Features, false);
184   const auto UnifiedFeatures = tools::unifyTargetFeatures(Features);
185   llvm::DenseSet<StringRef> FeatureSet(UnifiedFeatures.begin(),
186                                        UnifiedFeatures.end());
187   std::vector<std::string> MArch;
188   for (const auto &Ext : AArch64::Extensions)
189     if (FeatureSet.contains(Ext.Feature))
190       MArch.push_back(Ext.Name.str());
191   for (const auto &Ext : AArch64::Extensions)
192     if (FeatureSet.contains(Ext.NegFeature))
193       MArch.push_back(("no" + Ext.Name).str());
194   MArch.insert(MArch.begin(), ("-march=" + Triple.getArchName()).str());
195   Result.push_back(llvm::join(MArch, "+"));
196 }
197 
198 static void getARMMultilibFlags(const Driver &D,
199                                       const llvm::Triple &Triple,
200                                       const llvm::opt::ArgList &Args,
201                                       Multilib::flags_list &Result) {
202   std::vector<StringRef> Features;
203   llvm::ARM::FPUKind FPUKind = tools::arm::getARMTargetFeatures(
204       D, Triple, Args, Features, false /*ForAs*/, true /*ForMultilib*/);
205   const auto UnifiedFeatures = tools::unifyTargetFeatures(Features);
206   llvm::DenseSet<StringRef> FeatureSet(UnifiedFeatures.begin(),
207                                        UnifiedFeatures.end());
208   std::vector<std::string> MArch;
209   for (const auto &Ext : ARM::ARCHExtNames)
210     if (FeatureSet.contains(Ext.Feature))
211       MArch.push_back(Ext.Name.str());
212   for (const auto &Ext : ARM::ARCHExtNames)
213     if (FeatureSet.contains(Ext.NegFeature))
214       MArch.push_back(("no" + Ext.Name).str());
215   MArch.insert(MArch.begin(), ("-march=" + Triple.getArchName()).str());
216   Result.push_back(llvm::join(MArch, "+"));
217 
218   switch (FPUKind) {
219 #define ARM_FPU(NAME, KIND, VERSION, NEON_SUPPORT, RESTRICTION)                \
220   case llvm::ARM::KIND:                                                        \
221     Result.push_back("-mfpu=" NAME);                                           \
222     break;
223 #include "llvm/TargetParser/ARMTargetParser.def"
224   default:
225     llvm_unreachable("Invalid FPUKind");
226   }
227 
228   switch (arm::getARMFloatABI(D, Triple, Args)) {
229   case arm::FloatABI::Soft:
230     Result.push_back("-mfloat-abi=soft");
231     break;
232   case arm::FloatABI::SoftFP:
233     Result.push_back("-mfloat-abi=softfp");
234     break;
235   case arm::FloatABI::Hard:
236     Result.push_back("-mfloat-abi=hard");
237     break;
238   case arm::FloatABI::Invalid:
239     llvm_unreachable("Invalid float ABI");
240   }
241 }
242 
243 Multilib::flags_list
244 ToolChain::getMultilibFlags(const llvm::opt::ArgList &Args) const {
245   using namespace clang::driver::options;
246 
247   std::vector<std::string> Result;
248   const llvm::Triple Triple(ComputeEffectiveClangTriple(Args));
249   Result.push_back("--target=" + Triple.str());
250 
251   switch (Triple.getArch()) {
252   case llvm::Triple::aarch64:
253   case llvm::Triple::aarch64_32:
254   case llvm::Triple::aarch64_be:
255     getAArch64MultilibFlags(D, Triple, Args, Result);
256     break;
257   case llvm::Triple::arm:
258   case llvm::Triple::armeb:
259   case llvm::Triple::thumb:
260   case llvm::Triple::thumbeb:
261     getARMMultilibFlags(D, Triple, Args, Result);
262     break;
263   default:
264     break;
265   }
266 
267   // Sort and remove duplicates.
268   std::sort(Result.begin(), Result.end());
269   Result.erase(std::unique(Result.begin(), Result.end()), Result.end());
270   return Result;
271 }
272 
273 SanitizerArgs
274 ToolChain::getSanitizerArgs(const llvm::opt::ArgList &JobArgs) const {
275   SanitizerArgs SanArgs(*this, JobArgs, !SanitizerArgsChecked);
276   SanitizerArgsChecked = true;
277   return SanArgs;
278 }
279 
280 const XRayArgs& ToolChain::getXRayArgs() const {
281   if (!XRayArguments)
282     XRayArguments.reset(new XRayArgs(*this, Args));
283   return *XRayArguments;
284 }
285 
286 namespace {
287 
288 struct DriverSuffix {
289   const char *Suffix;
290   const char *ModeFlag;
291 };
292 
293 } // namespace
294 
295 static const DriverSuffix *FindDriverSuffix(StringRef ProgName, size_t &Pos) {
296   // A list of known driver suffixes. Suffixes are compared against the
297   // program name in order. If there is a match, the frontend type is updated as
298   // necessary by applying the ModeFlag.
299   static const DriverSuffix DriverSuffixes[] = {
300       {"clang", nullptr},
301       {"clang++", "--driver-mode=g++"},
302       {"clang-c++", "--driver-mode=g++"},
303       {"clang-cc", nullptr},
304       {"clang-cpp", "--driver-mode=cpp"},
305       {"clang-g++", "--driver-mode=g++"},
306       {"clang-gcc", nullptr},
307       {"clang-cl", "--driver-mode=cl"},
308       {"cc", nullptr},
309       {"cpp", "--driver-mode=cpp"},
310       {"cl", "--driver-mode=cl"},
311       {"++", "--driver-mode=g++"},
312       {"flang", "--driver-mode=flang"},
313       {"clang-dxc", "--driver-mode=dxc"},
314   };
315 
316   for (const auto &DS : DriverSuffixes) {
317     StringRef Suffix(DS.Suffix);
318     if (ProgName.ends_with(Suffix)) {
319       Pos = ProgName.size() - Suffix.size();
320       return &DS;
321     }
322   }
323   return nullptr;
324 }
325 
326 /// Normalize the program name from argv[0] by stripping the file extension if
327 /// present and lower-casing the string on Windows.
328 static std::string normalizeProgramName(llvm::StringRef Argv0) {
329   std::string ProgName = std::string(llvm::sys::path::filename(Argv0));
330   if (is_style_windows(llvm::sys::path::Style::native)) {
331     // Transform to lowercase for case insensitive file systems.
332     std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(),
333                    ::tolower);
334   }
335   return ProgName;
336 }
337 
338 static const DriverSuffix *parseDriverSuffix(StringRef ProgName, size_t &Pos) {
339   // Try to infer frontend type and default target from the program name by
340   // comparing it against DriverSuffixes in order.
341 
342   // If there is a match, the function tries to identify a target as prefix.
343   // E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
344   // prefix "x86_64-linux". If such a target prefix is found, it may be
345   // added via -target as implicit first argument.
346   const DriverSuffix *DS = FindDriverSuffix(ProgName, Pos);
347 
348   if (!DS && ProgName.ends_with(".exe")) {
349     // Try again after stripping the executable suffix:
350     // clang++.exe -> clang++
351     ProgName = ProgName.drop_back(StringRef(".exe").size());
352     DS = FindDriverSuffix(ProgName, Pos);
353   }
354 
355   if (!DS) {
356     // Try again after stripping any trailing version number:
357     // clang++3.5 -> clang++
358     ProgName = ProgName.rtrim("0123456789.");
359     DS = FindDriverSuffix(ProgName, Pos);
360   }
361 
362   if (!DS) {
363     // Try again after stripping trailing -component.
364     // clang++-tot -> clang++
365     ProgName = ProgName.slice(0, ProgName.rfind('-'));
366     DS = FindDriverSuffix(ProgName, Pos);
367   }
368   return DS;
369 }
370 
371 ParsedClangName
372 ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
373   std::string ProgName = normalizeProgramName(PN);
374   size_t SuffixPos;
375   const DriverSuffix *DS = parseDriverSuffix(ProgName, SuffixPos);
376   if (!DS)
377     return {};
378   size_t SuffixEnd = SuffixPos + strlen(DS->Suffix);
379 
380   size_t LastComponent = ProgName.rfind('-', SuffixPos);
381   if (LastComponent == std::string::npos)
382     return ParsedClangName(ProgName.substr(0, SuffixEnd), DS->ModeFlag);
383   std::string ModeSuffix = ProgName.substr(LastComponent + 1,
384                                            SuffixEnd - LastComponent - 1);
385 
386   // Infer target from the prefix.
387   StringRef Prefix(ProgName);
388   Prefix = Prefix.slice(0, LastComponent);
389   std::string IgnoredError;
390   bool IsRegistered =
391       llvm::TargetRegistry::lookupTarget(std::string(Prefix), IgnoredError);
392   return ParsedClangName{std::string(Prefix), ModeSuffix, DS->ModeFlag,
393                          IsRegistered};
394 }
395 
396 StringRef ToolChain::getDefaultUniversalArchName() const {
397   // In universal driver terms, the arch name accepted by -arch isn't exactly
398   // the same as the ones that appear in the triple. Roughly speaking, this is
399   // an inverse of the darwin::getArchTypeForDarwinArchName() function.
400   switch (Triple.getArch()) {
401   case llvm::Triple::aarch64: {
402     if (getTriple().isArm64e())
403       return "arm64e";
404     return "arm64";
405   }
406   case llvm::Triple::aarch64_32:
407     return "arm64_32";
408   case llvm::Triple::ppc:
409     return "ppc";
410   case llvm::Triple::ppcle:
411     return "ppcle";
412   case llvm::Triple::ppc64:
413     return "ppc64";
414   case llvm::Triple::ppc64le:
415     return "ppc64le";
416   default:
417     return Triple.getArchName();
418   }
419 }
420 
421 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
422   return Input.getFilename();
423 }
424 
425 ToolChain::UnwindTableLevel
426 ToolChain::getDefaultUnwindTableLevel(const ArgList &Args) const {
427   return UnwindTableLevel::None;
428 }
429 
430 unsigned ToolChain::GetDefaultDwarfVersion() const {
431   // TODO: Remove the RISC-V special case when R_RISCV_SET_ULEB128 linker
432   // support becomes more widely available.
433   return getTriple().isRISCV() ? 4 : 5;
434 }
435 
436 Tool *ToolChain::getClang() const {
437   if (!Clang)
438     Clang.reset(new tools::Clang(*this, useIntegratedBackend()));
439   return Clang.get();
440 }
441 
442 Tool *ToolChain::getFlang() const {
443   if (!Flang)
444     Flang.reset(new tools::Flang(*this));
445   return Flang.get();
446 }
447 
448 Tool *ToolChain::buildAssembler() const {
449   return new tools::ClangAs(*this);
450 }
451 
452 Tool *ToolChain::buildLinker() const {
453   llvm_unreachable("Linking is not supported by this toolchain");
454 }
455 
456 Tool *ToolChain::buildStaticLibTool() const {
457   llvm_unreachable("Creating static lib is not supported by this toolchain");
458 }
459 
460 Tool *ToolChain::getAssemble() const {
461   if (!Assemble)
462     Assemble.reset(buildAssembler());
463   return Assemble.get();
464 }
465 
466 Tool *ToolChain::getClangAs() const {
467   if (!Assemble)
468     Assemble.reset(new tools::ClangAs(*this));
469   return Assemble.get();
470 }
471 
472 Tool *ToolChain::getLink() const {
473   if (!Link)
474     Link.reset(buildLinker());
475   return Link.get();
476 }
477 
478 Tool *ToolChain::getStaticLibTool() const {
479   if (!StaticLibTool)
480     StaticLibTool.reset(buildStaticLibTool());
481   return StaticLibTool.get();
482 }
483 
484 Tool *ToolChain::getIfsMerge() const {
485   if (!IfsMerge)
486     IfsMerge.reset(new tools::ifstool::Merger(*this));
487   return IfsMerge.get();
488 }
489 
490 Tool *ToolChain::getOffloadBundler() const {
491   if (!OffloadBundler)
492     OffloadBundler.reset(new tools::OffloadBundler(*this));
493   return OffloadBundler.get();
494 }
495 
496 Tool *ToolChain::getOffloadPackager() const {
497   if (!OffloadPackager)
498     OffloadPackager.reset(new tools::OffloadPackager(*this));
499   return OffloadPackager.get();
500 }
501 
502 Tool *ToolChain::getLinkerWrapper() const {
503   if (!LinkerWrapper)
504     LinkerWrapper.reset(new tools::LinkerWrapper(*this, getLink()));
505   return LinkerWrapper.get();
506 }
507 
508 Tool *ToolChain::getTool(Action::ActionClass AC) const {
509   switch (AC) {
510   case Action::AssembleJobClass:
511     return getAssemble();
512 
513   case Action::IfsMergeJobClass:
514     return getIfsMerge();
515 
516   case Action::LinkJobClass:
517     return getLink();
518 
519   case Action::StaticLibJobClass:
520     return getStaticLibTool();
521 
522   case Action::InputClass:
523   case Action::BindArchClass:
524   case Action::OffloadClass:
525   case Action::LipoJobClass:
526   case Action::DsymutilJobClass:
527   case Action::VerifyDebugInfoJobClass:
528   case Action::BinaryAnalyzeJobClass:
529     llvm_unreachable("Invalid tool kind.");
530 
531   case Action::CompileJobClass:
532   case Action::PrecompileJobClass:
533   case Action::PreprocessJobClass:
534   case Action::ExtractAPIJobClass:
535   case Action::AnalyzeJobClass:
536   case Action::MigrateJobClass:
537   case Action::VerifyPCHJobClass:
538   case Action::BackendJobClass:
539     return getClang();
540 
541   case Action::OffloadBundlingJobClass:
542   case Action::OffloadUnbundlingJobClass:
543     return getOffloadBundler();
544 
545   case Action::OffloadPackagerJobClass:
546     return getOffloadPackager();
547   case Action::LinkerWrapperJobClass:
548     return getLinkerWrapper();
549   }
550 
551   llvm_unreachable("Invalid tool kind.");
552 }
553 
554 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
555                                              const ArgList &Args) {
556   const llvm::Triple &Triple = TC.getTriple();
557   bool IsWindows = Triple.isOSWindows();
558 
559   if (TC.isBareMetal())
560     return Triple.getArchName();
561 
562   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
563     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
564                ? "armhf"
565                : "arm";
566 
567   // For historic reasons, Android library is using i686 instead of i386.
568   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
569     return "i686";
570 
571   if (TC.getArch() == llvm::Triple::x86_64 && Triple.isX32())
572     return "x32";
573 
574   return llvm::Triple::getArchTypeName(TC.getArch());
575 }
576 
577 StringRef ToolChain::getOSLibName() const {
578   if (Triple.isOSDarwin())
579     return "darwin";
580 
581   switch (Triple.getOS()) {
582   case llvm::Triple::FreeBSD:
583     return "freebsd";
584   case llvm::Triple::NetBSD:
585     return "netbsd";
586   case llvm::Triple::OpenBSD:
587     return "openbsd";
588   case llvm::Triple::Solaris:
589     return "sunos";
590   case llvm::Triple::AIX:
591     return "aix";
592   default:
593     return getOS();
594   }
595 }
596 
597 std::string ToolChain::getCompilerRTPath() const {
598   SmallString<128> Path(getDriver().ResourceDir);
599   if (isBareMetal()) {
600     llvm::sys::path::append(Path, "lib", getOSLibName());
601     if (!SelectedMultilibs.empty()) {
602       Path += SelectedMultilibs.back().gccSuffix();
603     }
604   } else if (Triple.isOSUnknown()) {
605     llvm::sys::path::append(Path, "lib");
606   } else {
607     llvm::sys::path::append(Path, "lib", getOSLibName());
608   }
609   return std::string(Path);
610 }
611 
612 std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
613                                              StringRef Component,
614                                              FileType Type) const {
615   std::string CRTAbsolutePath = getCompilerRT(Args, Component, Type);
616   return llvm::sys::path::filename(CRTAbsolutePath).str();
617 }
618 
619 std::string ToolChain::buildCompilerRTBasename(const llvm::opt::ArgList &Args,
620                                                StringRef Component,
621                                                FileType Type,
622                                                bool AddArch) const {
623   const llvm::Triple &TT = getTriple();
624   bool IsITANMSVCWindows =
625       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
626 
627   const char *Prefix =
628       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
629   const char *Suffix;
630   switch (Type) {
631   case ToolChain::FT_Object:
632     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
633     break;
634   case ToolChain::FT_Static:
635     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
636     break;
637   case ToolChain::FT_Shared:
638     Suffix = TT.isOSWindows()
639                  ? (TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
640                  : ".so";
641     break;
642   }
643 
644   std::string ArchAndEnv;
645   if (AddArch) {
646     StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
647     const char *Env = TT.isAndroid() ? "-android" : "";
648     ArchAndEnv = ("-" + Arch + Env).str();
649   }
650   return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
651 }
652 
653 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
654                                      FileType Type) const {
655   // Check for runtime files in the new layout without the architecture first.
656   std::string CRTBasename =
657       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
658   for (const auto &LibPath : getLibraryPaths()) {
659     SmallString<128> P(LibPath);
660     llvm::sys::path::append(P, CRTBasename);
661     if (getVFS().exists(P))
662       return std::string(P);
663   }
664 
665   // Fall back to the old expected compiler-rt name if the new one does not
666   // exist.
667   CRTBasename =
668       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
669   SmallString<128> Path(getCompilerRTPath());
670   llvm::sys::path::append(Path, CRTBasename);
671   return std::string(Path);
672 }
673 
674 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
675                                               StringRef Component,
676                                               FileType Type) const {
677   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
678 }
679 
680 // Android target triples contain a target version. If we don't have libraries
681 // for the exact target version, we should fall back to the next newest version
682 // or a versionless path, if any.
683 std::optional<std::string>
684 ToolChain::getFallbackAndroidTargetPath(StringRef BaseDir) const {
685   llvm::Triple TripleWithoutLevel(getTriple());
686   TripleWithoutLevel.setEnvironmentName("android"); // remove any version number
687   const std::string &TripleWithoutLevelStr = TripleWithoutLevel.str();
688   unsigned TripleVersion = getTriple().getEnvironmentVersion().getMajor();
689   unsigned BestVersion = 0;
690 
691   SmallString<32> TripleDir;
692   bool UsingUnversionedDir = false;
693   std::error_code EC;
694   for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(BaseDir, EC), LE;
695        !EC && LI != LE; LI = LI.increment(EC)) {
696     StringRef DirName = llvm::sys::path::filename(LI->path());
697     StringRef DirNameSuffix = DirName;
698     if (DirNameSuffix.consume_front(TripleWithoutLevelStr)) {
699       if (DirNameSuffix.empty() && TripleDir.empty()) {
700         TripleDir = DirName;
701         UsingUnversionedDir = true;
702       } else {
703         unsigned Version;
704         if (!DirNameSuffix.getAsInteger(10, Version) && Version > BestVersion &&
705             Version < TripleVersion) {
706           BestVersion = Version;
707           TripleDir = DirName;
708           UsingUnversionedDir = false;
709         }
710       }
711     }
712   }
713 
714   if (TripleDir.empty())
715     return {};
716 
717   SmallString<128> P(BaseDir);
718   llvm::sys::path::append(P, TripleDir);
719   if (UsingUnversionedDir)
720     D.Diag(diag::warn_android_unversioned_fallback) << P << getTripleString();
721   return std::string(P);
722 }
723 
724 std::optional<std::string>
725 ToolChain::getTargetSubDirPath(StringRef BaseDir) const {
726   auto getPathForTriple =
727       [&](const llvm::Triple &Triple) -> std::optional<std::string> {
728     SmallString<128> P(BaseDir);
729     llvm::sys::path::append(P, Triple.str());
730     if (getVFS().exists(P))
731       return std::string(P);
732     return {};
733   };
734 
735   if (auto Path = getPathForTriple(getTriple()))
736     return *Path;
737 
738   // When building with per target runtime directories, various ways of naming
739   // the Arm architecture may have been normalised to simply "arm".
740   // For example "armv8l" (Armv8 AArch32 little endian) is replaced with "arm".
741   // Since an armv8l system can use libraries built for earlier architecture
742   // versions assuming endian and float ABI match.
743   //
744   // Original triple: armv8l-unknown-linux-gnueabihf
745   //  Runtime triple: arm-unknown-linux-gnueabihf
746   //
747   // We do not do this for armeb (big endian) because doing so could make us
748   // select little endian libraries. In addition, all known armeb triples only
749   // use the "armeb" architecture name.
750   //
751   // M profile Arm is bare metal and we know they will not be using the per
752   // target runtime directory layout.
753   if (getTriple().getArch() == Triple::arm && !getTriple().isArmMClass()) {
754     llvm::Triple ArmTriple = getTriple();
755     ArmTriple.setArch(Triple::arm);
756     if (auto Path = getPathForTriple(ArmTriple))
757       return *Path;
758   }
759 
760   if (getTriple().isAndroid())
761     return getFallbackAndroidTargetPath(BaseDir);
762 
763   return {};
764 }
765 
766 std::optional<std::string> ToolChain::getRuntimePath() const {
767   SmallString<128> P(D.ResourceDir);
768   llvm::sys::path::append(P, "lib");
769   return getTargetSubDirPath(P);
770 }
771 
772 std::optional<std::string> ToolChain::getStdlibPath() const {
773   SmallString<128> P(D.Dir);
774   llvm::sys::path::append(P, "..", "lib");
775   return getTargetSubDirPath(P);
776 }
777 
778 ToolChain::path_list ToolChain::getArchSpecificLibPaths() const {
779   path_list Paths;
780 
781   auto AddPath = [&](const ArrayRef<StringRef> &SS) {
782     SmallString<128> Path(getDriver().ResourceDir);
783     llvm::sys::path::append(Path, "lib");
784     for (auto &S : SS)
785       llvm::sys::path::append(Path, S);
786     Paths.push_back(std::string(Path));
787   };
788 
789   AddPath({getTriple().str()});
790   AddPath({getOSLibName(), llvm::Triple::getArchTypeName(getArch())});
791   return Paths;
792 }
793 
794 bool ToolChain::needsProfileRT(const ArgList &Args) {
795   if (Args.hasArg(options::OPT_noprofilelib))
796     return false;
797 
798   return Args.hasArg(options::OPT_fprofile_generate) ||
799          Args.hasArg(options::OPT_fprofile_generate_EQ) ||
800          Args.hasArg(options::OPT_fcs_profile_generate) ||
801          Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
802          Args.hasArg(options::OPT_fprofile_instr_generate) ||
803          Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
804          Args.hasArg(options::OPT_fcreate_profile) ||
805          Args.hasArg(options::OPT_forder_file_instrumentation);
806 }
807 
808 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
809   return Args.hasArg(options::OPT_coverage) ||
810          Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
811                       false);
812 }
813 
814 Tool *ToolChain::SelectTool(const JobAction &JA) const {
815   if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
816   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
817   Action::ActionClass AC = JA.getKind();
818   if (AC == Action::AssembleJobClass && useIntegratedAs() &&
819       !getTriple().isOSAIX())
820     return getClangAs();
821   return getTool(AC);
822 }
823 
824 std::string ToolChain::GetFilePath(const char *Name) const {
825   return D.GetFilePath(Name, *this);
826 }
827 
828 std::string ToolChain::GetProgramPath(const char *Name) const {
829   return D.GetProgramPath(Name, *this);
830 }
831 
832 std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD) const {
833   if (LinkerIsLLD)
834     *LinkerIsLLD = false;
835 
836   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
837   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
838   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
839   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
840 
841   // --ld-path= takes precedence over -fuse-ld= and specifies the executable
842   // name. -B, COMPILER_PATH and PATH and consulted if the value does not
843   // contain a path component separator.
844   // -fuse-ld=lld can be used with --ld-path= to inform clang that the binary
845   // that --ld-path= points to is lld.
846   if (const Arg *A = Args.getLastArg(options::OPT_ld_path_EQ)) {
847     std::string Path(A->getValue());
848     if (!Path.empty()) {
849       if (llvm::sys::path::parent_path(Path).empty())
850         Path = GetProgramPath(A->getValue());
851       if (llvm::sys::fs::can_execute(Path)) {
852         if (LinkerIsLLD)
853           *LinkerIsLLD = UseLinker == "lld";
854         return std::string(Path);
855       }
856     }
857     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
858     return GetProgramPath(getDefaultLinker());
859   }
860   // If we're passed -fuse-ld= with no argument, or with the argument ld,
861   // then use whatever the default system linker is.
862   if (UseLinker.empty() || UseLinker == "ld") {
863     const char *DefaultLinker = getDefaultLinker();
864     if (llvm::sys::path::is_absolute(DefaultLinker))
865       return std::string(DefaultLinker);
866     else
867       return GetProgramPath(DefaultLinker);
868   }
869 
870   // Extending -fuse-ld= to an absolute or relative path is unexpected. Checking
871   // for the linker flavor is brittle. In addition, prepending "ld." or "ld64."
872   // to a relative path is surprising. This is more complex due to priorities
873   // among -B, COMPILER_PATH and PATH. --ld-path= should be used instead.
874   if (UseLinker.contains('/'))
875     getDriver().Diag(diag::warn_drv_fuse_ld_path);
876 
877   if (llvm::sys::path::is_absolute(UseLinker)) {
878     // If we're passed what looks like an absolute path, don't attempt to
879     // second-guess that.
880     if (llvm::sys::fs::can_execute(UseLinker))
881       return std::string(UseLinker);
882   } else {
883     llvm::SmallString<8> LinkerName;
884     if (Triple.isOSDarwin())
885       LinkerName.append("ld64.");
886     else
887       LinkerName.append("ld.");
888     LinkerName.append(UseLinker);
889 
890     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
891     if (llvm::sys::fs::can_execute(LinkerPath)) {
892       if (LinkerIsLLD)
893         *LinkerIsLLD = UseLinker == "lld";
894       return LinkerPath;
895     }
896   }
897 
898   if (A)
899     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
900 
901   return GetProgramPath(getDefaultLinker());
902 }
903 
904 std::string ToolChain::GetStaticLibToolPath() const {
905   // TODO: Add support for static lib archiving on Windows
906   if (Triple.isOSDarwin())
907     return GetProgramPath("libtool");
908   return GetProgramPath("llvm-ar");
909 }
910 
911 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
912   types::ID id = types::lookupTypeForExtension(Ext);
913 
914   // Flang always runs the preprocessor and has no notion of "preprocessed
915   // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
916   // them differently.
917   if (D.IsFlangMode() && id == types::TY_PP_Fortran)
918     id = types::TY_Fortran;
919 
920   return id;
921 }
922 
923 bool ToolChain::HasNativeLLVMSupport() const {
924   return false;
925 }
926 
927 bool ToolChain::isCrossCompiling() const {
928   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
929   switch (HostTriple.getArch()) {
930   // The A32/T32/T16 instruction sets are not separate architectures in this
931   // context.
932   case llvm::Triple::arm:
933   case llvm::Triple::armeb:
934   case llvm::Triple::thumb:
935   case llvm::Triple::thumbeb:
936     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
937            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
938   default:
939     return HostTriple.getArch() != getArch();
940   }
941 }
942 
943 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
944   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
945                      VersionTuple());
946 }
947 
948 llvm::ExceptionHandling
949 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
950   return llvm::ExceptionHandling::None;
951 }
952 
953 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
954   if (Model == "single") {
955     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
956     return Triple.getArch() == llvm::Triple::arm ||
957            Triple.getArch() == llvm::Triple::armeb ||
958            Triple.getArch() == llvm::Triple::thumb ||
959            Triple.getArch() == llvm::Triple::thumbeb || Triple.isWasm();
960   } else if (Model == "posix")
961     return true;
962 
963   return false;
964 }
965 
966 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
967                                          types::ID InputType) const {
968   switch (getTriple().getArch()) {
969   default:
970     return getTripleString();
971 
972   case llvm::Triple::x86_64: {
973     llvm::Triple Triple = getTriple();
974     if (!Triple.isOSBinFormatMachO())
975       return getTripleString();
976 
977     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
978       // x86_64h goes in the triple. Other -march options just use the
979       // vanilla triple we already have.
980       StringRef MArch = A->getValue();
981       if (MArch == "x86_64h")
982         Triple.setArchName(MArch);
983     }
984     return Triple.getTriple();
985   }
986   case llvm::Triple::aarch64: {
987     llvm::Triple Triple = getTriple();
988     if (!Triple.isOSBinFormatMachO())
989       return getTripleString();
990 
991     if (Triple.isArm64e())
992       return getTripleString();
993 
994     // FIXME: older versions of ld64 expect the "arm64" component in the actual
995     // triple string and query it to determine whether an LTO file can be
996     // handled. Remove this when we don't care any more.
997     Triple.setArchName("arm64");
998     return Triple.getTriple();
999   }
1000   case llvm::Triple::aarch64_32:
1001     return getTripleString();
1002   case llvm::Triple::arm:
1003   case llvm::Triple::armeb:
1004   case llvm::Triple::thumb:
1005   case llvm::Triple::thumbeb: {
1006     llvm::Triple Triple = getTriple();
1007     tools::arm::setArchNameInTriple(getDriver(), Args, InputType, Triple);
1008     tools::arm::setFloatABIInTriple(getDriver(), Args, Triple);
1009     return Triple.getTriple();
1010   }
1011   }
1012 }
1013 
1014 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
1015                                                    types::ID InputType) const {
1016   return ComputeLLVMTriple(Args, InputType);
1017 }
1018 
1019 std::string ToolChain::computeSysRoot() const {
1020   return D.SysRoot;
1021 }
1022 
1023 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
1024                                           ArgStringList &CC1Args) const {
1025   // Each toolchain should provide the appropriate include flags.
1026 }
1027 
1028 void ToolChain::addClangTargetOptions(
1029     const ArgList &DriverArgs, ArgStringList &CC1Args,
1030     Action::OffloadKind DeviceOffloadKind) const {}
1031 
1032 void ToolChain::addClangCC1ASTargetOptions(const ArgList &Args,
1033                                            ArgStringList &CC1ASArgs) const {}
1034 
1035 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
1036 
1037 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
1038                                  llvm::opt::ArgStringList &CmdArgs) const {
1039   if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
1040     return;
1041 
1042   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
1043 }
1044 
1045 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
1046     const ArgList &Args) const {
1047   if (runtimeLibType)
1048     return *runtimeLibType;
1049 
1050   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
1051   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
1052 
1053   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
1054   if (LibName == "compiler-rt")
1055     runtimeLibType = ToolChain::RLT_CompilerRT;
1056   else if (LibName == "libgcc")
1057     runtimeLibType = ToolChain::RLT_Libgcc;
1058   else if (LibName == "platform")
1059     runtimeLibType = GetDefaultRuntimeLibType();
1060   else {
1061     if (A)
1062       getDriver().Diag(diag::err_drv_invalid_rtlib_name)
1063           << A->getAsString(Args);
1064 
1065     runtimeLibType = GetDefaultRuntimeLibType();
1066   }
1067 
1068   return *runtimeLibType;
1069 }
1070 
1071 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
1072     const ArgList &Args) const {
1073   if (unwindLibType)
1074     return *unwindLibType;
1075 
1076   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
1077   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
1078 
1079   if (LibName == "none")
1080     unwindLibType = ToolChain::UNW_None;
1081   else if (LibName == "platform" || LibName == "") {
1082     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
1083     if (RtLibType == ToolChain::RLT_CompilerRT) {
1084       if (getTriple().isAndroid() || getTriple().isOSAIX())
1085         unwindLibType = ToolChain::UNW_CompilerRT;
1086       else
1087         unwindLibType = ToolChain::UNW_None;
1088     } else if (RtLibType == ToolChain::RLT_Libgcc)
1089       unwindLibType = ToolChain::UNW_Libgcc;
1090   } else if (LibName == "libunwind") {
1091     if (GetRuntimeLibType(Args) == RLT_Libgcc)
1092       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
1093     unwindLibType = ToolChain::UNW_CompilerRT;
1094   } else if (LibName == "libgcc")
1095     unwindLibType = ToolChain::UNW_Libgcc;
1096   else {
1097     if (A)
1098       getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
1099           << A->getAsString(Args);
1100 
1101     unwindLibType = GetDefaultUnwindLibType();
1102   }
1103 
1104   return *unwindLibType;
1105 }
1106 
1107 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
1108   if (cxxStdlibType)
1109     return *cxxStdlibType;
1110 
1111   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
1112   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
1113 
1114   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
1115   if (LibName == "libc++")
1116     cxxStdlibType = ToolChain::CST_Libcxx;
1117   else if (LibName == "libstdc++")
1118     cxxStdlibType = ToolChain::CST_Libstdcxx;
1119   else if (LibName == "platform")
1120     cxxStdlibType = GetDefaultCXXStdlibType();
1121   else {
1122     if (A)
1123       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
1124           << A->getAsString(Args);
1125 
1126     cxxStdlibType = GetDefaultCXXStdlibType();
1127   }
1128 
1129   return *cxxStdlibType;
1130 }
1131 
1132 /// Utility function to add a system include directory to CC1 arguments.
1133 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
1134                                             ArgStringList &CC1Args,
1135                                             const Twine &Path) {
1136   CC1Args.push_back("-internal-isystem");
1137   CC1Args.push_back(DriverArgs.MakeArgString(Path));
1138 }
1139 
1140 /// Utility function to add a system include directory with extern "C"
1141 /// semantics to CC1 arguments.
1142 ///
1143 /// Note that this should be used rarely, and only for directories that
1144 /// historically and for legacy reasons are treated as having implicit extern
1145 /// "C" semantics. These semantics are *ignored* by and large today, but its
1146 /// important to preserve the preprocessor changes resulting from the
1147 /// classification.
1148 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
1149                                                    ArgStringList &CC1Args,
1150                                                    const Twine &Path) {
1151   CC1Args.push_back("-internal-externc-isystem");
1152   CC1Args.push_back(DriverArgs.MakeArgString(Path));
1153 }
1154 
1155 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
1156                                                 ArgStringList &CC1Args,
1157                                                 const Twine &Path) {
1158   if (llvm::sys::fs::exists(Path))
1159     addExternCSystemInclude(DriverArgs, CC1Args, Path);
1160 }
1161 
1162 /// Utility function to add a list of system include directories to CC1.
1163 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
1164                                              ArgStringList &CC1Args,
1165                                              ArrayRef<StringRef> Paths) {
1166   for (const auto &Path : Paths) {
1167     CC1Args.push_back("-internal-isystem");
1168     CC1Args.push_back(DriverArgs.MakeArgString(Path));
1169   }
1170 }
1171 
1172 /*static*/ std::string ToolChain::concat(StringRef Path, const Twine &A,
1173                                          const Twine &B, const Twine &C,
1174                                          const Twine &D) {
1175   SmallString<128> Result(Path);
1176   llvm::sys::path::append(Result, llvm::sys::path::Style::posix, A, B, C, D);
1177   return std::string(Result);
1178 }
1179 
1180 std::string ToolChain::detectLibcxxVersion(StringRef IncludePath) const {
1181   std::error_code EC;
1182   int MaxVersion = 0;
1183   std::string MaxVersionString;
1184   SmallString<128> Path(IncludePath);
1185   llvm::sys::path::append(Path, "c++");
1186   for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(Path, EC), LE;
1187        !EC && LI != LE; LI = LI.increment(EC)) {
1188     StringRef VersionText = llvm::sys::path::filename(LI->path());
1189     int Version;
1190     if (VersionText[0] == 'v' &&
1191         !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
1192       if (Version > MaxVersion) {
1193         MaxVersion = Version;
1194         MaxVersionString = std::string(VersionText);
1195       }
1196     }
1197   }
1198   if (!MaxVersion)
1199     return "";
1200   return MaxVersionString;
1201 }
1202 
1203 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
1204                                              ArgStringList &CC1Args) const {
1205   // Header search paths should be handled by each of the subclasses.
1206   // Historically, they have not been, and instead have been handled inside of
1207   // the CC1-layer frontend. As the logic is hoisted out, this generic function
1208   // will slowly stop being called.
1209   //
1210   // While it is being called, replicate a bit of a hack to propagate the
1211   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
1212   // header search paths with it. Once all systems are overriding this
1213   // function, the CC1 flag and this line can be removed.
1214   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
1215 }
1216 
1217 void ToolChain::AddClangCXXStdlibIsystemArgs(
1218     const llvm::opt::ArgList &DriverArgs,
1219     llvm::opt::ArgStringList &CC1Args) const {
1220   DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
1221   // This intentionally only looks at -nostdinc++, and not -nostdinc or
1222   // -nostdlibinc. The purpose of -stdlib++-isystem is to support toolchain
1223   // setups with non-standard search logic for the C++ headers, while still
1224   // allowing users of the toolchain to bring their own C++ headers. Such a
1225   // toolchain likely also has non-standard search logic for the C headers and
1226   // uses -nostdinc to suppress the default logic, but -stdlib++-isystem should
1227   // still work in that case and only be suppressed by an explicit -nostdinc++
1228   // in a project using the toolchain.
1229   if (!DriverArgs.hasArg(options::OPT_nostdincxx))
1230     for (const auto &P :
1231          DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
1232       addSystemInclude(DriverArgs, CC1Args, P);
1233 }
1234 
1235 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
1236   return getDriver().CCCIsCXX() &&
1237          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
1238                       options::OPT_nostdlibxx);
1239 }
1240 
1241 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
1242                                     ArgStringList &CmdArgs) const {
1243   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
1244          "should not have called this");
1245   CXXStdlibType Type = GetCXXStdlibType(Args);
1246 
1247   switch (Type) {
1248   case ToolChain::CST_Libcxx:
1249     CmdArgs.push_back("-lc++");
1250     if (Args.hasArg(options::OPT_fexperimental_library))
1251       CmdArgs.push_back("-lc++experimental");
1252     break;
1253 
1254   case ToolChain::CST_Libstdcxx:
1255     CmdArgs.push_back("-lstdc++");
1256     break;
1257   }
1258 }
1259 
1260 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
1261                                    ArgStringList &CmdArgs) const {
1262   for (const auto &LibPath : getFilePaths())
1263     if(LibPath.length() > 0)
1264       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
1265 }
1266 
1267 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
1268                                  ArgStringList &CmdArgs) const {
1269   CmdArgs.push_back("-lcc_kext");
1270 }
1271 
1272 bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
1273                                            std::string &Path) const {
1274   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
1275   // (to keep the linker options consistent with gcc and clang itself).
1276   if (!isOptimizationLevelFast(Args)) {
1277     // Check if -ffast-math or -funsafe-math.
1278     Arg *A =
1279       Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
1280                       options::OPT_funsafe_math_optimizations,
1281                       options::OPT_fno_unsafe_math_optimizations);
1282 
1283     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
1284         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
1285       return false;
1286   }
1287   // If crtfastmath.o exists add it to the arguments.
1288   Path = GetFilePath("crtfastmath.o");
1289   return (Path != "crtfastmath.o"); // Not found.
1290 }
1291 
1292 bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
1293                                               ArgStringList &CmdArgs) const {
1294   std::string Path;
1295   if (isFastMathRuntimeAvailable(Args, Path)) {
1296     CmdArgs.push_back(Args.MakeArgString(Path));
1297     return true;
1298   }
1299 
1300   return false;
1301 }
1302 
1303 Expected<SmallVector<std::string>>
1304 ToolChain::getSystemGPUArchs(const llvm::opt::ArgList &Args) const {
1305   return SmallVector<std::string>();
1306 }
1307 
1308 SanitizerMask ToolChain::getSupportedSanitizers() const {
1309   // Return sanitizers which don't require runtime support and are not
1310   // platform dependent.
1311 
1312   SanitizerMask Res =
1313       (SanitizerKind::Undefined & ~SanitizerKind::Vptr) |
1314       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
1315       SanitizerKind::CFICastStrict | SanitizerKind::FloatDivideByZero |
1316       SanitizerKind::KCFI | SanitizerKind::UnsignedIntegerOverflow |
1317       SanitizerKind::UnsignedShiftBase | SanitizerKind::ImplicitConversion |
1318       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1319   if (getTriple().getArch() == llvm::Triple::x86 ||
1320       getTriple().getArch() == llvm::Triple::x86_64 ||
1321       getTriple().getArch() == llvm::Triple::arm || getTriple().isWasm() ||
1322       getTriple().isAArch64() || getTriple().isRISCV() ||
1323       getTriple().isLoongArch64())
1324     Res |= SanitizerKind::CFIICall;
1325   if (getTriple().getArch() == llvm::Triple::x86_64 ||
1326       getTriple().isAArch64(64) || getTriple().isRISCV())
1327     Res |= SanitizerKind::ShadowCallStack;
1328   if (getTriple().isAArch64(64))
1329     Res |= SanitizerKind::MemTag;
1330   return Res;
1331 }
1332 
1333 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1334                                    ArgStringList &CC1Args) const {}
1335 
1336 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1337                                   ArgStringList &CC1Args) const {}
1338 
1339 llvm::SmallVector<ToolChain::BitCodeLibraryInfo, 12>
1340 ToolChain::getDeviceLibs(const ArgList &DriverArgs) const {
1341   return {};
1342 }
1343 
1344 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1345                                     ArgStringList &CC1Args) const {}
1346 
1347 static VersionTuple separateMSVCFullVersion(unsigned Version) {
1348   if (Version < 100)
1349     return VersionTuple(Version);
1350 
1351   if (Version < 10000)
1352     return VersionTuple(Version / 100, Version % 100);
1353 
1354   unsigned Build = 0, Factor = 1;
1355   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
1356     Build = Build + (Version % 10) * Factor;
1357   return VersionTuple(Version / 100, Version % 100, Build);
1358 }
1359 
1360 VersionTuple
1361 ToolChain::computeMSVCVersion(const Driver *D,
1362                               const llvm::opt::ArgList &Args) const {
1363   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
1364   const Arg *MSCompatibilityVersion =
1365       Args.getLastArg(options::OPT_fms_compatibility_version);
1366 
1367   if (MSCVersion && MSCompatibilityVersion) {
1368     if (D)
1369       D->Diag(diag::err_drv_argument_not_allowed_with)
1370           << MSCVersion->getAsString(Args)
1371           << MSCompatibilityVersion->getAsString(Args);
1372     return VersionTuple();
1373   }
1374 
1375   if (MSCompatibilityVersion) {
1376     VersionTuple MSVT;
1377     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
1378       if (D)
1379         D->Diag(diag::err_drv_invalid_value)
1380             << MSCompatibilityVersion->getAsString(Args)
1381             << MSCompatibilityVersion->getValue();
1382     } else {
1383       return MSVT;
1384     }
1385   }
1386 
1387   if (MSCVersion) {
1388     unsigned Version = 0;
1389     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
1390       if (D)
1391         D->Diag(diag::err_drv_invalid_value)
1392             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
1393     } else {
1394       return separateMSVCFullVersion(Version);
1395     }
1396   }
1397 
1398   return VersionTuple();
1399 }
1400 
1401 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
1402     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
1403     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
1404   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1405   const OptTable &Opts = getDriver().getOpts();
1406   bool Modified = false;
1407 
1408   // Handle -Xopenmp-target flags
1409   for (auto *A : Args) {
1410     // Exclude flags which may only apply to the host toolchain.
1411     // Do not exclude flags when the host triple (AuxTriple)
1412     // matches the current toolchain triple. If it is not present
1413     // at all, target and host share a toolchain.
1414     if (A->getOption().matches(options::OPT_m_Group)) {
1415       // Pass code object version to device toolchain
1416       // to correctly set metadata in intermediate files.
1417       if (SameTripleAsHost ||
1418           A->getOption().matches(options::OPT_mcode_object_version_EQ))
1419         DAL->append(A);
1420       else
1421         Modified = true;
1422       continue;
1423     }
1424 
1425     unsigned Index;
1426     unsigned Prev;
1427     bool XOpenMPTargetNoTriple =
1428         A->getOption().matches(options::OPT_Xopenmp_target);
1429 
1430     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
1431       llvm::Triple TT(getOpenMPTriple(A->getValue(0)));
1432 
1433       // Passing device args: -Xopenmp-target=<triple> -opt=val.
1434       if (TT.getTriple() == getTripleString())
1435         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1436       else
1437         continue;
1438     } else if (XOpenMPTargetNoTriple) {
1439       // Passing device args: -Xopenmp-target -opt=val.
1440       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
1441     } else {
1442       DAL->append(A);
1443       continue;
1444     }
1445 
1446     // Parse the argument to -Xopenmp-target.
1447     Prev = Index;
1448     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
1449     if (!XOpenMPTargetArg || Index > Prev + 1) {
1450       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
1451           << A->getAsString(Args);
1452       continue;
1453     }
1454     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
1455         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
1456       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
1457       continue;
1458     }
1459     XOpenMPTargetArg->setBaseArg(A);
1460     A = XOpenMPTargetArg.release();
1461     AllocatedArgs.push_back(A);
1462     DAL->append(A);
1463     Modified = true;
1464   }
1465 
1466   if (Modified)
1467     return DAL;
1468 
1469   delete DAL;
1470   return nullptr;
1471 }
1472 
1473 // TODO: Currently argument values separated by space e.g.
1474 // -Xclang -mframe-pointer=no cannot be passed by -Xarch_. This should be
1475 // fixed.
1476 void ToolChain::TranslateXarchArgs(
1477     const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
1478     llvm::opt::DerivedArgList *DAL,
1479     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1480   const OptTable &Opts = getDriver().getOpts();
1481   unsigned ValuePos = 1;
1482   if (A->getOption().matches(options::OPT_Xarch_device) ||
1483       A->getOption().matches(options::OPT_Xarch_host))
1484     ValuePos = 0;
1485 
1486   unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(ValuePos));
1487   unsigned Prev = Index;
1488   std::unique_ptr<llvm::opt::Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1489 
1490   // If the argument parsing failed or more than one argument was
1491   // consumed, the -Xarch_ argument's parameter tried to consume
1492   // extra arguments. Emit an error and ignore.
1493   //
1494   // We also want to disallow any options which would alter the
1495   // driver behavior; that isn't going to work in our model. We
1496   // use options::NoXarchOption to control this.
1497   if (!XarchArg || Index > Prev + 1) {
1498     getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1499         << A->getAsString(Args);
1500     return;
1501   } else if (XarchArg->getOption().hasFlag(options::NoXarchOption)) {
1502     auto &Diags = getDriver().getDiags();
1503     unsigned DiagID =
1504         Diags.getCustomDiagID(DiagnosticsEngine::Error,
1505                               "invalid Xarch argument: '%0', not all driver "
1506                               "options can be forwared via Xarch argument");
1507     Diags.Report(DiagID) << A->getAsString(Args);
1508     return;
1509   }
1510   XarchArg->setBaseArg(A);
1511   A = XarchArg.release();
1512   if (!AllocatedArgs)
1513     DAL->AddSynthesizedArg(A);
1514   else
1515     AllocatedArgs->push_back(A);
1516 }
1517 
1518 llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1519     const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1520     Action::OffloadKind OFK,
1521     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1522   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1523   bool Modified = false;
1524 
1525   bool IsDevice = OFK != Action::OFK_None && OFK != Action::OFK_Host;
1526   for (Arg *A : Args) {
1527     bool NeedTrans = false;
1528     bool Skip = false;
1529     if (A->getOption().matches(options::OPT_Xarch_device)) {
1530       NeedTrans = IsDevice;
1531       Skip = !IsDevice;
1532     } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1533       NeedTrans = !IsDevice;
1534       Skip = IsDevice;
1535     } else if (A->getOption().matches(options::OPT_Xarch__) && IsDevice) {
1536       // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1537       // they may need special translation.
1538       // Skip this argument unless the architecture matches BoundArch
1539       if (BoundArch.empty() || A->getValue(0) != BoundArch)
1540         Skip = true;
1541       else
1542         NeedTrans = true;
1543     }
1544     if (NeedTrans || Skip)
1545       Modified = true;
1546     if (NeedTrans)
1547       TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1548     if (!Skip)
1549       DAL->append(A);
1550   }
1551 
1552   if (Modified)
1553     return DAL;
1554 
1555   delete DAL;
1556   return nullptr;
1557 }
1558