1 //===- ToolChain.cpp - Collections of tools for one platform --------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "clang/Driver/ToolChain.h"
10 #include "InputInfo.h"
11 #include "ToolChains/Arch/ARM.h"
12 #include "ToolChains/Clang.h"
13 #include "ToolChains/InterfaceStubs.h"
14 #include "ToolChains/Flang.h"
15 #include "clang/Basic/ObjCRuntime.h"
16 #include "clang/Basic/Sanitizers.h"
17 #include "clang/Config/config.h"
18 #include "clang/Driver/Action.h"
19 #include "clang/Driver/Driver.h"
20 #include "clang/Driver/DriverDiagnostic.h"
21 #include "clang/Driver/Job.h"
22 #include "clang/Driver/Options.h"
23 #include "clang/Driver/SanitizerArgs.h"
24 #include "clang/Driver/XRayArgs.h"
25 #include "llvm/ADT/STLExtras.h"
26 #include "llvm/ADT/SmallString.h"
27 #include "llvm/ADT/StringRef.h"
28 #include "llvm/ADT/Triple.h"
29 #include "llvm/ADT/Twine.h"
30 #include "llvm/Config/llvm-config.h"
31 #include "llvm/MC/MCTargetOptions.h"
32 #include "llvm/Option/Arg.h"
33 #include "llvm/Option/ArgList.h"
34 #include "llvm/Option/OptTable.h"
35 #include "llvm/Option/Option.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/FileSystem.h"
38 #include "llvm/Support/Path.h"
39 #include "llvm/Support/TargetParser.h"
40 #include "llvm/Support/TargetRegistry.h"
41 #include "llvm/Support/VersionTuple.h"
42 #include "llvm/Support/VirtualFileSystem.h"
43 #include <cassert>
44 #include <cstddef>
45 #include <cstring>
46 #include <string>
47 
48 using namespace clang;
49 using namespace driver;
50 using namespace tools;
51 using namespace llvm;
52 using namespace llvm::opt;
53 
54 static llvm::opt::Arg *GetRTTIArgument(const ArgList &Args) {
55   return Args.getLastArg(options::OPT_mkernel, options::OPT_fapple_kext,
56                          options::OPT_fno_rtti, options::OPT_frtti);
57 }
58 
59 static ToolChain::RTTIMode CalculateRTTIMode(const ArgList &Args,
60                                              const llvm::Triple &Triple,
61                                              const Arg *CachedRTTIArg) {
62   // Explicit rtti/no-rtti args
63   if (CachedRTTIArg) {
64     if (CachedRTTIArg->getOption().matches(options::OPT_frtti))
65       return ToolChain::RM_Enabled;
66     else
67       return ToolChain::RM_Disabled;
68   }
69 
70   // -frtti is default, except for the PS4 CPU.
71   return (Triple.isPS4CPU()) ? ToolChain::RM_Disabled : ToolChain::RM_Enabled;
72 }
73 
74 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
75                      const ArgList &Args)
76     : D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
77       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
78   if (D.CCCIsCXX()) {
79     if (auto CXXStdlibPath = getCXXStdlibPath())
80       getFilePaths().push_back(*CXXStdlibPath);
81   }
82 
83   if (auto RuntimePath = getRuntimePath())
84     getLibraryPaths().push_back(*RuntimePath);
85 
86   std::string CandidateLibPath = getArchSpecificLibPath();
87   if (getVFS().exists(CandidateLibPath))
88     getFilePaths().push_back(CandidateLibPath);
89 }
90 
91 void ToolChain::setTripleEnvironment(llvm::Triple::EnvironmentType Env) {
92   Triple.setEnvironment(Env);
93   if (EffectiveTriple != llvm::Triple())
94     EffectiveTriple.setEnvironment(Env);
95 }
96 
97 ToolChain::~ToolChain() = default;
98 
99 llvm::vfs::FileSystem &ToolChain::getVFS() const {
100   return getDriver().getVFS();
101 }
102 
103 bool ToolChain::useIntegratedAs() const {
104   return Args.hasFlag(options::OPT_fintegrated_as,
105                       options::OPT_fno_integrated_as,
106                       IsIntegratedAssemblerDefault());
107 }
108 
109 bool ToolChain::useRelaxRelocations() const {
110   return ENABLE_X86_RELAX_RELOCATIONS;
111 }
112 
113 bool ToolChain::isNoExecStackDefault() const {
114     return false;
115 }
116 
117 const SanitizerArgs& ToolChain::getSanitizerArgs() const {
118   if (!SanitizerArguments.get())
119     SanitizerArguments.reset(new SanitizerArgs(*this, Args));
120   return *SanitizerArguments.get();
121 }
122 
123 const XRayArgs& ToolChain::getXRayArgs() const {
124   if (!XRayArguments.get())
125     XRayArguments.reset(new XRayArgs(*this, Args));
126   return *XRayArguments.get();
127 }
128 
129 namespace {
130 
131 struct DriverSuffix {
132   const char *Suffix;
133   const char *ModeFlag;
134 };
135 
136 } // namespace
137 
138 static const DriverSuffix *FindDriverSuffix(StringRef ProgName, size_t &Pos) {
139   // A list of known driver suffixes. Suffixes are compared against the
140   // program name in order. If there is a match, the frontend type is updated as
141   // necessary by applying the ModeFlag.
142   static const DriverSuffix DriverSuffixes[] = {
143       {"clang", nullptr},
144       {"clang++", "--driver-mode=g++"},
145       {"clang-c++", "--driver-mode=g++"},
146       {"clang-cc", nullptr},
147       {"clang-cpp", "--driver-mode=cpp"},
148       {"clang-g++", "--driver-mode=g++"},
149       {"clang-gcc", nullptr},
150       {"clang-cl", "--driver-mode=cl"},
151       {"cc", nullptr},
152       {"cpp", "--driver-mode=cpp"},
153       {"cl", "--driver-mode=cl"},
154       {"++", "--driver-mode=g++"},
155       {"flang", "--driver-mode=flang"},
156   };
157 
158   for (size_t i = 0; i < llvm::array_lengthof(DriverSuffixes); ++i) {
159     StringRef Suffix(DriverSuffixes[i].Suffix);
160     if (ProgName.endswith(Suffix)) {
161       Pos = ProgName.size() - Suffix.size();
162       return &DriverSuffixes[i];
163     }
164   }
165   return nullptr;
166 }
167 
168 /// Normalize the program name from argv[0] by stripping the file extension if
169 /// present and lower-casing the string on Windows.
170 static std::string normalizeProgramName(llvm::StringRef Argv0) {
171   std::string ProgName = std::string(llvm::sys::path::stem(Argv0));
172 #ifdef _WIN32
173   // Transform to lowercase for case insensitive file systems.
174   std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(), ::tolower);
175 #endif
176   return ProgName;
177 }
178 
179 static const DriverSuffix *parseDriverSuffix(StringRef ProgName, size_t &Pos) {
180   // Try to infer frontend type and default target from the program name by
181   // comparing it against DriverSuffixes in order.
182 
183   // If there is a match, the function tries to identify a target as prefix.
184   // E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
185   // prefix "x86_64-linux". If such a target prefix is found, it may be
186   // added via -target as implicit first argument.
187   const DriverSuffix *DS = FindDriverSuffix(ProgName, Pos);
188 
189   if (!DS) {
190     // Try again after stripping any trailing version number:
191     // clang++3.5 -> clang++
192     ProgName = ProgName.rtrim("0123456789.");
193     DS = FindDriverSuffix(ProgName, Pos);
194   }
195 
196   if (!DS) {
197     // Try again after stripping trailing -component.
198     // clang++-tot -> clang++
199     ProgName = ProgName.slice(0, ProgName.rfind('-'));
200     DS = FindDriverSuffix(ProgName, Pos);
201   }
202   return DS;
203 }
204 
205 ParsedClangName
206 ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
207   std::string ProgName = normalizeProgramName(PN);
208   size_t SuffixPos;
209   const DriverSuffix *DS = parseDriverSuffix(ProgName, SuffixPos);
210   if (!DS)
211     return {};
212   size_t SuffixEnd = SuffixPos + strlen(DS->Suffix);
213 
214   size_t LastComponent = ProgName.rfind('-', SuffixPos);
215   if (LastComponent == std::string::npos)
216     return ParsedClangName(ProgName.substr(0, SuffixEnd), DS->ModeFlag);
217   std::string ModeSuffix = ProgName.substr(LastComponent + 1,
218                                            SuffixEnd - LastComponent - 1);
219 
220   // Infer target from the prefix.
221   StringRef Prefix(ProgName);
222   Prefix = Prefix.slice(0, LastComponent);
223   std::string IgnoredError;
224   bool IsRegistered =
225       llvm::TargetRegistry::lookupTarget(std::string(Prefix), IgnoredError);
226   return ParsedClangName{std::string(Prefix), ModeSuffix, DS->ModeFlag,
227                          IsRegistered};
228 }
229 
230 StringRef ToolChain::getDefaultUniversalArchName() const {
231   // In universal driver terms, the arch name accepted by -arch isn't exactly
232   // the same as the ones that appear in the triple. Roughly speaking, this is
233   // an inverse of the darwin::getArchTypeForDarwinArchName() function.
234   switch (Triple.getArch()) {
235   case llvm::Triple::aarch64:
236     return "arm64";
237   case llvm::Triple::aarch64_32:
238     return "arm64_32";
239   case llvm::Triple::ppc:
240     return "ppc";
241   case llvm::Triple::ppc64:
242     return "ppc64";
243   case llvm::Triple::ppc64le:
244     return "ppc64le";
245   default:
246     return Triple.getArchName();
247   }
248 }
249 
250 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
251   return Input.getFilename();
252 }
253 
254 bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
255   return false;
256 }
257 
258 Tool *ToolChain::getClang() const {
259   if (!Clang)
260     Clang.reset(new tools::Clang(*this));
261   return Clang.get();
262 }
263 
264 Tool *ToolChain::getFlang() const {
265   if (!Flang)
266     Flang.reset(new tools::Flang(*this));
267   return Flang.get();
268 }
269 
270 Tool *ToolChain::buildAssembler() const {
271   return new tools::ClangAs(*this);
272 }
273 
274 Tool *ToolChain::buildLinker() const {
275   llvm_unreachable("Linking is not supported by this toolchain");
276 }
277 
278 Tool *ToolChain::buildStaticLibTool() const {
279   llvm_unreachable("Creating static lib is not supported by this toolchain");
280 }
281 
282 Tool *ToolChain::getAssemble() const {
283   if (!Assemble)
284     Assemble.reset(buildAssembler());
285   return Assemble.get();
286 }
287 
288 Tool *ToolChain::getClangAs() const {
289   if (!Assemble)
290     Assemble.reset(new tools::ClangAs(*this));
291   return Assemble.get();
292 }
293 
294 Tool *ToolChain::getLink() const {
295   if (!Link)
296     Link.reset(buildLinker());
297   return Link.get();
298 }
299 
300 Tool *ToolChain::getStaticLibTool() const {
301   if (!StaticLibTool)
302     StaticLibTool.reset(buildStaticLibTool());
303   return StaticLibTool.get();
304 }
305 
306 Tool *ToolChain::getIfsMerge() const {
307   if (!IfsMerge)
308     IfsMerge.reset(new tools::ifstool::Merger(*this));
309   return IfsMerge.get();
310 }
311 
312 Tool *ToolChain::getOffloadBundler() const {
313   if (!OffloadBundler)
314     OffloadBundler.reset(new tools::OffloadBundler(*this));
315   return OffloadBundler.get();
316 }
317 
318 Tool *ToolChain::getOffloadWrapper() const {
319   if (!OffloadWrapper)
320     OffloadWrapper.reset(new tools::OffloadWrapper(*this));
321   return OffloadWrapper.get();
322 }
323 
324 Tool *ToolChain::getTool(Action::ActionClass AC) const {
325   switch (AC) {
326   case Action::AssembleJobClass:
327     return getAssemble();
328 
329   case Action::IfsMergeJobClass:
330     return getIfsMerge();
331 
332   case Action::LinkJobClass:
333     return getLink();
334 
335   case Action::StaticLibJobClass:
336     return getStaticLibTool();
337 
338   case Action::InputClass:
339   case Action::BindArchClass:
340   case Action::OffloadClass:
341   case Action::LipoJobClass:
342   case Action::DsymutilJobClass:
343   case Action::VerifyDebugInfoJobClass:
344     llvm_unreachable("Invalid tool kind.");
345 
346   case Action::CompileJobClass:
347   case Action::PrecompileJobClass:
348   case Action::HeaderModulePrecompileJobClass:
349   case Action::PreprocessJobClass:
350   case Action::AnalyzeJobClass:
351   case Action::MigrateJobClass:
352   case Action::VerifyPCHJobClass:
353   case Action::BackendJobClass:
354     return getClang();
355 
356   case Action::OffloadBundlingJobClass:
357   case Action::OffloadUnbundlingJobClass:
358     return getOffloadBundler();
359 
360   case Action::OffloadWrapperJobClass:
361     return getOffloadWrapper();
362   }
363 
364   llvm_unreachable("Invalid tool kind.");
365 }
366 
367 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
368                                              const ArgList &Args) {
369   const llvm::Triple &Triple = TC.getTriple();
370   bool IsWindows = Triple.isOSWindows();
371 
372   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
373     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
374                ? "armhf"
375                : "arm";
376 
377   // For historic reasons, Android library is using i686 instead of i386.
378   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
379     return "i686";
380 
381   return llvm::Triple::getArchTypeName(TC.getArch());
382 }
383 
384 StringRef ToolChain::getOSLibName() const {
385   switch (Triple.getOS()) {
386   case llvm::Triple::FreeBSD:
387     return "freebsd";
388   case llvm::Triple::NetBSD:
389     return "netbsd";
390   case llvm::Triple::OpenBSD:
391     return "openbsd";
392   case llvm::Triple::Solaris:
393     return "sunos";
394   case llvm::Triple::AIX:
395     return "aix";
396   default:
397     return getOS();
398   }
399 }
400 
401 std::string ToolChain::getCompilerRTPath() const {
402   SmallString<128> Path(getDriver().ResourceDir);
403   if (Triple.isOSUnknown()) {
404     llvm::sys::path::append(Path, "lib");
405   } else {
406     llvm::sys::path::append(Path, "lib", getOSLibName());
407   }
408   return std::string(Path.str());
409 }
410 
411 std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
412                                              StringRef Component, FileType Type,
413                                              bool AddArch) const {
414   const llvm::Triple &TT = getTriple();
415   bool IsITANMSVCWindows =
416       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
417 
418   const char *Prefix =
419       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
420   const char *Suffix;
421   switch (Type) {
422   case ToolChain::FT_Object:
423     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
424     break;
425   case ToolChain::FT_Static:
426     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
427     break;
428   case ToolChain::FT_Shared:
429     Suffix = Triple.isOSWindows()
430                  ? (Triple.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
431                  : ".so";
432     break;
433   }
434 
435   std::string ArchAndEnv;
436   if (AddArch) {
437     StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
438     const char *Env = TT.isAndroid() ? "-android" : "";
439     ArchAndEnv = ("-" + Arch + Env).str();
440   }
441   return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
442 }
443 
444 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
445                                      FileType Type) const {
446   // Check for runtime files in the new layout without the architecture first.
447   std::string CRTBasename =
448       getCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
449   for (const auto &LibPath : getLibraryPaths()) {
450     SmallString<128> P(LibPath);
451     llvm::sys::path::append(P, CRTBasename);
452     if (getVFS().exists(P))
453       return std::string(P.str());
454   }
455 
456   // Fall back to the old expected compiler-rt name if the new one does not
457   // exist.
458   CRTBasename = getCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
459   SmallString<128> Path(getCompilerRTPath());
460   llvm::sys::path::append(Path, CRTBasename);
461   return std::string(Path.str());
462 }
463 
464 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
465                                               StringRef Component,
466                                               FileType Type) const {
467   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
468 }
469 
470 
471 Optional<std::string> ToolChain::getRuntimePath() const {
472   SmallString<128> P;
473 
474   // First try the triple passed to driver as --target=<triple>.
475   P.assign(D.ResourceDir);
476   llvm::sys::path::append(P, "lib", D.getTargetTriple());
477   if (getVFS().exists(P))
478     return llvm::Optional<std::string>(std::string(P.str()));
479 
480   // Second try the normalized triple.
481   P.assign(D.ResourceDir);
482   llvm::sys::path::append(P, "lib", Triple.str());
483   if (getVFS().exists(P))
484     return llvm::Optional<std::string>(std::string(P.str()));
485 
486   return None;
487 }
488 
489 Optional<std::string> ToolChain::getCXXStdlibPath() const {
490   SmallString<128> P;
491 
492   // First try the triple passed to driver as --target=<triple>.
493   P.assign(D.Dir);
494   llvm::sys::path::append(P, "..", "lib", D.getTargetTriple(), "c++");
495   if (getVFS().exists(P))
496     return llvm::Optional<std::string>(std::string(P.str()));
497 
498   // Second try the normalized triple.
499   P.assign(D.Dir);
500   llvm::sys::path::append(P, "..", "lib", Triple.str(), "c++");
501   if (getVFS().exists(P))
502     return llvm::Optional<std::string>(std::string(P.str()));
503 
504   return None;
505 }
506 
507 std::string ToolChain::getArchSpecificLibPath() const {
508   SmallString<128> Path(getDriver().ResourceDir);
509   llvm::sys::path::append(Path, "lib", getOSLibName(),
510                           llvm::Triple::getArchTypeName(getArch()));
511   return std::string(Path.str());
512 }
513 
514 bool ToolChain::needsProfileRT(const ArgList &Args) {
515   if (Args.hasArg(options::OPT_noprofilelib))
516     return false;
517 
518   return Args.hasArg(options::OPT_fprofile_generate) ||
519          Args.hasArg(options::OPT_fprofile_generate_EQ) ||
520          Args.hasArg(options::OPT_fcs_profile_generate) ||
521          Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
522          Args.hasArg(options::OPT_fprofile_instr_generate) ||
523          Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
524          Args.hasArg(options::OPT_fcreate_profile) ||
525          Args.hasArg(options::OPT_forder_file_instrumentation);
526 }
527 
528 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
529   return Args.hasArg(options::OPT_coverage) ||
530          Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
531                       false);
532 }
533 
534 Tool *ToolChain::SelectTool(const JobAction &JA) const {
535   if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
536   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
537   Action::ActionClass AC = JA.getKind();
538   if (AC == Action::AssembleJobClass && useIntegratedAs())
539     return getClangAs();
540   return getTool(AC);
541 }
542 
543 std::string ToolChain::GetFilePath(const char *Name) const {
544   return D.GetFilePath(Name, *this);
545 }
546 
547 std::string ToolChain::GetProgramPath(const char *Name) const {
548   return D.GetProgramPath(Name, *this);
549 }
550 
551 std::string ToolChain::GetLinkerPath() const {
552   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
553   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
554   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
555   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
556 
557   // --ld-path= takes precedence over -fuse-ld= and specifies the executable
558   // name. -B, COMPILER_PATH and PATH and consulted if the value does not
559   // contain a path component separator.
560   if (const Arg *A = Args.getLastArg(options::OPT_ld_path_EQ)) {
561     std::string Path(A->getValue());
562     if (!Path.empty()) {
563       if (llvm::sys::path::parent_path(Path).empty())
564         Path = GetProgramPath(A->getValue());
565       if (llvm::sys::fs::can_execute(Path))
566         return std::string(Path);
567     }
568     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
569     return GetProgramPath(getDefaultLinker());
570   }
571   // If we're passed -fuse-ld= with no argument, or with the argument ld,
572   // then use whatever the default system linker is.
573   if (UseLinker.empty() || UseLinker == "ld") {
574     const char *DefaultLinker = getDefaultLinker();
575     if (llvm::sys::path::is_absolute(DefaultLinker))
576       return std::string(DefaultLinker);
577     else
578       return GetProgramPath(DefaultLinker);
579   }
580 
581   // Extending -fuse-ld= to an absolute or relative path is unexpected. Checking
582   // for the linker flavor is brittle. In addition, prepending "ld." or "ld64."
583   // to a relative path is surprising. This is more complex due to priorities
584   // among -B, COMPILER_PATH and PATH. --ld-path= should be used instead.
585   if (UseLinker.find('/') != StringRef::npos)
586     getDriver().Diag(diag::warn_drv_fuse_ld_path);
587 
588   if (llvm::sys::path::is_absolute(UseLinker)) {
589     // If we're passed what looks like an absolute path, don't attempt to
590     // second-guess that.
591     if (llvm::sys::fs::can_execute(UseLinker))
592       return std::string(UseLinker);
593   } else {
594     llvm::SmallString<8> LinkerName;
595     if (Triple.isOSDarwin())
596       LinkerName.append("ld64.");
597     else
598       LinkerName.append("ld.");
599     LinkerName.append(UseLinker);
600 
601     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
602     if (llvm::sys::fs::can_execute(LinkerPath))
603       return LinkerPath;
604   }
605 
606   if (A)
607     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
608 
609   return GetProgramPath(getDefaultLinker());
610 }
611 
612 std::string ToolChain::GetStaticLibToolPath() const {
613   // TODO: Add support for static lib archiving on Windows
614   return GetProgramPath("llvm-ar");
615 }
616 
617 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
618   types::ID id = types::lookupTypeForExtension(Ext);
619 
620   // Flang always runs the preprocessor and has no notion of "preprocessed
621   // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
622   // them differently.
623   if (D.IsFlangMode() && id == types::TY_PP_Fortran)
624     id = types::TY_Fortran;
625 
626   return id;
627 }
628 
629 bool ToolChain::HasNativeLLVMSupport() const {
630   return false;
631 }
632 
633 bool ToolChain::isCrossCompiling() const {
634   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
635   switch (HostTriple.getArch()) {
636   // The A32/T32/T16 instruction sets are not separate architectures in this
637   // context.
638   case llvm::Triple::arm:
639   case llvm::Triple::armeb:
640   case llvm::Triple::thumb:
641   case llvm::Triple::thumbeb:
642     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
643            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
644   default:
645     return HostTriple.getArch() != getArch();
646   }
647 }
648 
649 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
650   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
651                      VersionTuple());
652 }
653 
654 llvm::ExceptionHandling
655 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
656   return llvm::ExceptionHandling::None;
657 }
658 
659 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
660   if (Model == "single") {
661     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
662     return Triple.getArch() == llvm::Triple::arm ||
663            Triple.getArch() == llvm::Triple::armeb ||
664            Triple.getArch() == llvm::Triple::thumb ||
665            Triple.getArch() == llvm::Triple::thumbeb || Triple.isWasm();
666   } else if (Model == "posix")
667     return true;
668 
669   return false;
670 }
671 
672 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
673                                          types::ID InputType) const {
674   switch (getTriple().getArch()) {
675   default:
676     return getTripleString();
677 
678   case llvm::Triple::x86_64: {
679     llvm::Triple Triple = getTriple();
680     if (!Triple.isOSBinFormatMachO())
681       return getTripleString();
682 
683     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
684       // x86_64h goes in the triple. Other -march options just use the
685       // vanilla triple we already have.
686       StringRef MArch = A->getValue();
687       if (MArch == "x86_64h")
688         Triple.setArchName(MArch);
689     }
690     return Triple.getTriple();
691   }
692   case llvm::Triple::aarch64: {
693     llvm::Triple Triple = getTriple();
694     if (!Triple.isOSBinFormatMachO())
695       return getTripleString();
696 
697     // FIXME: older versions of ld64 expect the "arm64" component in the actual
698     // triple string and query it to determine whether an LTO file can be
699     // handled. Remove this when we don't care any more.
700     Triple.setArchName("arm64");
701     return Triple.getTriple();
702   }
703   case llvm::Triple::aarch64_32:
704     return getTripleString();
705   case llvm::Triple::arm:
706   case llvm::Triple::armeb:
707   case llvm::Triple::thumb:
708   case llvm::Triple::thumbeb: {
709     // FIXME: Factor into subclasses.
710     llvm::Triple Triple = getTriple();
711     bool IsBigEndian = getTriple().getArch() == llvm::Triple::armeb ||
712                        getTriple().getArch() == llvm::Triple::thumbeb;
713 
714     // Handle pseudo-target flags '-mlittle-endian'/'-EL' and
715     // '-mbig-endian'/'-EB'.
716     if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
717                                  options::OPT_mbig_endian)) {
718       IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
719     }
720 
721     // Thumb2 is the default for V7 on Darwin.
722     //
723     // FIXME: Thumb should just be another -target-feaure, not in the triple.
724     StringRef MCPU, MArch;
725     if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
726       MCPU = A->getValue();
727     if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
728       MArch = A->getValue();
729     std::string CPU =
730         Triple.isOSBinFormatMachO()
731             ? tools::arm::getARMCPUForMArch(MArch, Triple).str()
732             : tools::arm::getARMTargetCPU(MCPU, MArch, Triple);
733     StringRef Suffix =
734       tools::arm::getLLVMArchSuffixForARM(CPU, MArch, Triple);
735     bool IsMProfile = ARM::parseArchProfile(Suffix) == ARM::ProfileKind::M;
736     bool ThumbDefault = IsMProfile || (ARM::parseArchVersion(Suffix) == 7 &&
737                                        getTriple().isOSBinFormatMachO());
738     // FIXME: this is invalid for WindowsCE
739     if (getTriple().isOSWindows())
740       ThumbDefault = true;
741     std::string ArchName;
742     if (IsBigEndian)
743       ArchName = "armeb";
744     else
745       ArchName = "arm";
746 
747     // Check if ARM ISA was explicitly selected (using -mno-thumb or -marm) for
748     // M-Class CPUs/architecture variants, which is not supported.
749     bool ARMModeRequested = !Args.hasFlag(options::OPT_mthumb,
750                                           options::OPT_mno_thumb, ThumbDefault);
751     if (IsMProfile && ARMModeRequested) {
752       if (!MCPU.empty())
753         getDriver().Diag(diag::err_cpu_unsupported_isa) << CPU << "ARM";
754        else
755         getDriver().Diag(diag::err_arch_unsupported_isa)
756           << tools::arm::getARMArch(MArch, getTriple()) << "ARM";
757     }
758 
759     // Check to see if an explicit choice to use thumb has been made via
760     // -mthumb. For assembler files we must check for -mthumb in the options
761     // passed to the assembler via -Wa or -Xassembler.
762     bool IsThumb = false;
763     if (InputType != types::TY_PP_Asm)
764       IsThumb = Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb,
765                               ThumbDefault);
766     else {
767       // Ideally we would check for these flags in
768       // CollectArgsForIntegratedAssembler but we can't change the ArchName at
769       // that point. There is no assembler equivalent of -mno-thumb, -marm, or
770       // -mno-arm.
771       for (const auto *A :
772            Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler)) {
773         for (StringRef Value : A->getValues()) {
774           if (Value == "-mthumb")
775             IsThumb = true;
776         }
777       }
778     }
779     // Assembly files should start in ARM mode, unless arch is M-profile, or
780     // -mthumb has been passed explicitly to the assembler. Windows is always
781     // thumb.
782     if (IsThumb || IsMProfile || getTriple().isOSWindows()) {
783       if (IsBigEndian)
784         ArchName = "thumbeb";
785       else
786         ArchName = "thumb";
787     }
788     Triple.setArchName(ArchName + Suffix.str());
789 
790     bool isHardFloat =
791         (arm::getARMFloatABI(getDriver(), Triple, Args) == arm::FloatABI::Hard);
792     switch (Triple.getEnvironment()) {
793     case Triple::GNUEABI:
794     case Triple::GNUEABIHF:
795       Triple.setEnvironment(isHardFloat ? Triple::GNUEABIHF : Triple::GNUEABI);
796       break;
797     case Triple::EABI:
798     case Triple::EABIHF:
799       Triple.setEnvironment(isHardFloat ? Triple::EABIHF : Triple::EABI);
800       break;
801     case Triple::MuslEABI:
802     case Triple::MuslEABIHF:
803       Triple.setEnvironment(isHardFloat ? Triple::MuslEABIHF
804                                         : Triple::MuslEABI);
805       break;
806     default: {
807       arm::FloatABI DefaultABI = arm::getDefaultFloatABI(Triple);
808       if (DefaultABI != arm::FloatABI::Invalid &&
809           isHardFloat != (DefaultABI == arm::FloatABI::Hard)) {
810         Arg *ABIArg =
811             Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
812                             options::OPT_mfloat_abi_EQ);
813         assert(ABIArg && "Non-default float abi expected to be from arg");
814         D.Diag(diag::err_drv_unsupported_opt_for_target)
815             << ABIArg->getAsString(Args) << Triple.getTriple();
816       }
817       break;
818     }
819     }
820 
821     return Triple.getTriple();
822   }
823   }
824 }
825 
826 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
827                                                    types::ID InputType) const {
828   return ComputeLLVMTriple(Args, InputType);
829 }
830 
831 std::string ToolChain::computeSysRoot() const {
832   return D.SysRoot;
833 }
834 
835 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
836                                           ArgStringList &CC1Args) const {
837   // Each toolchain should provide the appropriate include flags.
838 }
839 
840 void ToolChain::addClangTargetOptions(
841     const ArgList &DriverArgs, ArgStringList &CC1Args,
842     Action::OffloadKind DeviceOffloadKind) const {}
843 
844 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
845 
846 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
847                                  llvm::opt::ArgStringList &CmdArgs) const {
848   if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
849     return;
850 
851   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
852 }
853 
854 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
855     const ArgList &Args) const {
856   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
857   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
858 
859   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
860   if (LibName == "compiler-rt")
861     return ToolChain::RLT_CompilerRT;
862   else if (LibName == "libgcc")
863     return ToolChain::RLT_Libgcc;
864   else if (LibName == "platform")
865     return GetDefaultRuntimeLibType();
866 
867   if (A)
868     getDriver().Diag(diag::err_drv_invalid_rtlib_name) << A->getAsString(Args);
869 
870   return GetDefaultRuntimeLibType();
871 }
872 
873 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
874     const ArgList &Args) const {
875   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
876   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
877 
878   if (LibName == "none")
879     return ToolChain::UNW_None;
880   else if (LibName == "platform" || LibName == "") {
881     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
882     if (RtLibType == ToolChain::RLT_CompilerRT)
883       return ToolChain::UNW_None;
884     else if (RtLibType == ToolChain::RLT_Libgcc)
885       return ToolChain::UNW_Libgcc;
886   } else if (LibName == "libunwind") {
887     if (GetRuntimeLibType(Args) == RLT_Libgcc)
888       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
889     return ToolChain::UNW_CompilerRT;
890   } else if (LibName == "libgcc")
891     return ToolChain::UNW_Libgcc;
892 
893   if (A)
894     getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
895         << A->getAsString(Args);
896 
897   return GetDefaultUnwindLibType();
898 }
899 
900 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
901   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
902   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
903 
904   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
905   if (LibName == "libc++")
906     return ToolChain::CST_Libcxx;
907   else if (LibName == "libstdc++")
908     return ToolChain::CST_Libstdcxx;
909   else if (LibName == "platform")
910     return GetDefaultCXXStdlibType();
911 
912   if (A)
913     getDriver().Diag(diag::err_drv_invalid_stdlib_name) << A->getAsString(Args);
914 
915   return GetDefaultCXXStdlibType();
916 }
917 
918 /// Utility function to add a system include directory to CC1 arguments.
919 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
920                                             ArgStringList &CC1Args,
921                                             const Twine &Path) {
922   CC1Args.push_back("-internal-isystem");
923   CC1Args.push_back(DriverArgs.MakeArgString(Path));
924 }
925 
926 /// Utility function to add a system include directory with extern "C"
927 /// semantics to CC1 arguments.
928 ///
929 /// Note that this should be used rarely, and only for directories that
930 /// historically and for legacy reasons are treated as having implicit extern
931 /// "C" semantics. These semantics are *ignored* by and large today, but its
932 /// important to preserve the preprocessor changes resulting from the
933 /// classification.
934 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
935                                                    ArgStringList &CC1Args,
936                                                    const Twine &Path) {
937   CC1Args.push_back("-internal-externc-isystem");
938   CC1Args.push_back(DriverArgs.MakeArgString(Path));
939 }
940 
941 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
942                                                 ArgStringList &CC1Args,
943                                                 const Twine &Path) {
944   if (llvm::sys::fs::exists(Path))
945     addExternCSystemInclude(DriverArgs, CC1Args, Path);
946 }
947 
948 /// Utility function to add a list of system include directories to CC1.
949 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
950                                              ArgStringList &CC1Args,
951                                              ArrayRef<StringRef> Paths) {
952   for (const auto &Path : Paths) {
953     CC1Args.push_back("-internal-isystem");
954     CC1Args.push_back(DriverArgs.MakeArgString(Path));
955   }
956 }
957 
958 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
959                                              ArgStringList &CC1Args) const {
960   // Header search paths should be handled by each of the subclasses.
961   // Historically, they have not been, and instead have been handled inside of
962   // the CC1-layer frontend. As the logic is hoisted out, this generic function
963   // will slowly stop being called.
964   //
965   // While it is being called, replicate a bit of a hack to propagate the
966   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
967   // header search paths with it. Once all systems are overriding this
968   // function, the CC1 flag and this line can be removed.
969   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
970 }
971 
972 void ToolChain::AddClangCXXStdlibIsystemArgs(
973     const llvm::opt::ArgList &DriverArgs,
974     llvm::opt::ArgStringList &CC1Args) const {
975   DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
976   if (!DriverArgs.hasArg(options::OPT_nostdincxx))
977     for (const auto &P :
978          DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
979       addSystemInclude(DriverArgs, CC1Args, P);
980 }
981 
982 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
983   return getDriver().CCCIsCXX() &&
984          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
985                       options::OPT_nostdlibxx);
986 }
987 
988 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
989                                     ArgStringList &CmdArgs) const {
990   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
991          "should not have called this");
992   CXXStdlibType Type = GetCXXStdlibType(Args);
993 
994   switch (Type) {
995   case ToolChain::CST_Libcxx:
996     CmdArgs.push_back("-lc++");
997     break;
998 
999   case ToolChain::CST_Libstdcxx:
1000     CmdArgs.push_back("-lstdc++");
1001     break;
1002   }
1003 }
1004 
1005 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
1006                                    ArgStringList &CmdArgs) const {
1007   for (const auto &LibPath : getFilePaths())
1008     if(LibPath.length() > 0)
1009       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
1010 }
1011 
1012 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
1013                                  ArgStringList &CmdArgs) const {
1014   CmdArgs.push_back("-lcc_kext");
1015 }
1016 
1017 bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
1018                                            std::string &Path) const {
1019   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
1020   // (to keep the linker options consistent with gcc and clang itself).
1021   if (!isOptimizationLevelFast(Args)) {
1022     // Check if -ffast-math or -funsafe-math.
1023     Arg *A =
1024       Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
1025                       options::OPT_funsafe_math_optimizations,
1026                       options::OPT_fno_unsafe_math_optimizations);
1027 
1028     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
1029         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
1030       return false;
1031   }
1032   // If crtfastmath.o exists add it to the arguments.
1033   Path = GetFilePath("crtfastmath.o");
1034   return (Path != "crtfastmath.o"); // Not found.
1035 }
1036 
1037 bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
1038                                               ArgStringList &CmdArgs) const {
1039   std::string Path;
1040   if (isFastMathRuntimeAvailable(Args, Path)) {
1041     CmdArgs.push_back(Args.MakeArgString(Path));
1042     return true;
1043   }
1044 
1045   return false;
1046 }
1047 
1048 SanitizerMask ToolChain::getSupportedSanitizers() const {
1049   // Return sanitizers which don't require runtime support and are not
1050   // platform dependent.
1051 
1052   SanitizerMask Res =
1053       (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
1054        ~SanitizerKind::Function) |
1055       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
1056       SanitizerKind::CFICastStrict | SanitizerKind::FloatDivideByZero |
1057       SanitizerKind::UnsignedIntegerOverflow |
1058       SanitizerKind::UnsignedShiftBase | SanitizerKind::ImplicitConversion |
1059       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1060   if (getTriple().getArch() == llvm::Triple::x86 ||
1061       getTriple().getArch() == llvm::Triple::x86_64 ||
1062       getTriple().getArch() == llvm::Triple::arm || getTriple().isWasm() ||
1063       getTriple().isAArch64())
1064     Res |= SanitizerKind::CFIICall;
1065   if (getTriple().getArch() == llvm::Triple::x86_64 ||
1066       getTriple().isAArch64() || getTriple().isRISCV())
1067     Res |= SanitizerKind::ShadowCallStack;
1068   if (getTriple().isAArch64())
1069     Res |= SanitizerKind::MemTag;
1070   return Res;
1071 }
1072 
1073 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1074                                    ArgStringList &CC1Args) const {}
1075 
1076 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1077                                   ArgStringList &CC1Args) const {}
1078 
1079 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1080                                     ArgStringList &CC1Args) const {}
1081 
1082 static VersionTuple separateMSVCFullVersion(unsigned Version) {
1083   if (Version < 100)
1084     return VersionTuple(Version);
1085 
1086   if (Version < 10000)
1087     return VersionTuple(Version / 100, Version % 100);
1088 
1089   unsigned Build = 0, Factor = 1;
1090   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
1091     Build = Build + (Version % 10) * Factor;
1092   return VersionTuple(Version / 100, Version % 100, Build);
1093 }
1094 
1095 VersionTuple
1096 ToolChain::computeMSVCVersion(const Driver *D,
1097                               const llvm::opt::ArgList &Args) const {
1098   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
1099   const Arg *MSCompatibilityVersion =
1100       Args.getLastArg(options::OPT_fms_compatibility_version);
1101 
1102   if (MSCVersion && MSCompatibilityVersion) {
1103     if (D)
1104       D->Diag(diag::err_drv_argument_not_allowed_with)
1105           << MSCVersion->getAsString(Args)
1106           << MSCompatibilityVersion->getAsString(Args);
1107     return VersionTuple();
1108   }
1109 
1110   if (MSCompatibilityVersion) {
1111     VersionTuple MSVT;
1112     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
1113       if (D)
1114         D->Diag(diag::err_drv_invalid_value)
1115             << MSCompatibilityVersion->getAsString(Args)
1116             << MSCompatibilityVersion->getValue();
1117     } else {
1118       return MSVT;
1119     }
1120   }
1121 
1122   if (MSCVersion) {
1123     unsigned Version = 0;
1124     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
1125       if (D)
1126         D->Diag(diag::err_drv_invalid_value)
1127             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
1128     } else {
1129       return separateMSVCFullVersion(Version);
1130     }
1131   }
1132 
1133   return VersionTuple();
1134 }
1135 
1136 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
1137     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
1138     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
1139   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1140   const OptTable &Opts = getDriver().getOpts();
1141   bool Modified = false;
1142 
1143   // Handle -Xopenmp-target flags
1144   for (auto *A : Args) {
1145     // Exclude flags which may only apply to the host toolchain.
1146     // Do not exclude flags when the host triple (AuxTriple)
1147     // matches the current toolchain triple. If it is not present
1148     // at all, target and host share a toolchain.
1149     if (A->getOption().matches(options::OPT_m_Group)) {
1150       if (SameTripleAsHost)
1151         DAL->append(A);
1152       else
1153         Modified = true;
1154       continue;
1155     }
1156 
1157     unsigned Index;
1158     unsigned Prev;
1159     bool XOpenMPTargetNoTriple =
1160         A->getOption().matches(options::OPT_Xopenmp_target);
1161 
1162     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
1163       // Passing device args: -Xopenmp-target=<triple> -opt=val.
1164       if (A->getValue(0) == getTripleString())
1165         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1166       else
1167         continue;
1168     } else if (XOpenMPTargetNoTriple) {
1169       // Passing device args: -Xopenmp-target -opt=val.
1170       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
1171     } else {
1172       DAL->append(A);
1173       continue;
1174     }
1175 
1176     // Parse the argument to -Xopenmp-target.
1177     Prev = Index;
1178     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
1179     if (!XOpenMPTargetArg || Index > Prev + 1) {
1180       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
1181           << A->getAsString(Args);
1182       continue;
1183     }
1184     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
1185         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
1186       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
1187       continue;
1188     }
1189     XOpenMPTargetArg->setBaseArg(A);
1190     A = XOpenMPTargetArg.release();
1191     AllocatedArgs.push_back(A);
1192     DAL->append(A);
1193     Modified = true;
1194   }
1195 
1196   if (Modified)
1197     return DAL;
1198 
1199   delete DAL;
1200   return nullptr;
1201 }
1202 
1203 // TODO: Currently argument values separated by space e.g.
1204 // -Xclang -mframe-pointer=no cannot be passed by -Xarch_. This should be
1205 // fixed.
1206 void ToolChain::TranslateXarchArgs(
1207     const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
1208     llvm::opt::DerivedArgList *DAL,
1209     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1210   const OptTable &Opts = getDriver().getOpts();
1211   unsigned ValuePos = 1;
1212   if (A->getOption().matches(options::OPT_Xarch_device) ||
1213       A->getOption().matches(options::OPT_Xarch_host))
1214     ValuePos = 0;
1215 
1216   unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(ValuePos));
1217   unsigned Prev = Index;
1218   std::unique_ptr<llvm::opt::Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1219 
1220   // If the argument parsing failed or more than one argument was
1221   // consumed, the -Xarch_ argument's parameter tried to consume
1222   // extra arguments. Emit an error and ignore.
1223   //
1224   // We also want to disallow any options which would alter the
1225   // driver behavior; that isn't going to work in our model. We
1226   // use options::NoXarchOption to control this.
1227   if (!XarchArg || Index > Prev + 1) {
1228     getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1229         << A->getAsString(Args);
1230     return;
1231   } else if (XarchArg->getOption().hasFlag(options::NoXarchOption)) {
1232     auto &Diags = getDriver().getDiags();
1233     unsigned DiagID =
1234         Diags.getCustomDiagID(DiagnosticsEngine::Error,
1235                               "invalid Xarch argument: '%0', not all driver "
1236                               "options can be forwared via Xarch argument");
1237     Diags.Report(DiagID) << A->getAsString(Args);
1238     return;
1239   }
1240   XarchArg->setBaseArg(A);
1241   A = XarchArg.release();
1242   if (!AllocatedArgs)
1243     DAL->AddSynthesizedArg(A);
1244   else
1245     AllocatedArgs->push_back(A);
1246 }
1247 
1248 llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1249     const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1250     Action::OffloadKind OFK,
1251     SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1252   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1253   bool Modified = false;
1254 
1255   bool IsGPU = OFK == Action::OFK_Cuda || OFK == Action::OFK_HIP;
1256   for (Arg *A : Args) {
1257     bool NeedTrans = false;
1258     bool Skip = false;
1259     if (A->getOption().matches(options::OPT_Xarch_device)) {
1260       NeedTrans = IsGPU;
1261       Skip = !IsGPU;
1262     } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1263       NeedTrans = !IsGPU;
1264       Skip = IsGPU;
1265     } else if (A->getOption().matches(options::OPT_Xarch__) && IsGPU) {
1266       // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1267       // they may need special translation.
1268       // Skip this argument unless the architecture matches BoundArch
1269       if (BoundArch.empty() || A->getValue(0) != BoundArch)
1270         Skip = true;
1271       else
1272         NeedTrans = true;
1273     }
1274     if (NeedTrans || Skip)
1275       Modified = true;
1276     if (NeedTrans)
1277       TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1278     if (!Skip)
1279       DAL->append(A);
1280   }
1281 
1282   if (Modified)
1283     return DAL;
1284 
1285   delete DAL;
1286   return nullptr;
1287 }
1288