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