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 "clang/Basic/ObjCRuntime.h"
14 #include "clang/Basic/Sanitizers.h"
15 #include "clang/Config/config.h"
16 #include "clang/Driver/Action.h"
17 #include "clang/Driver/Driver.h"
18 #include "clang/Driver/DriverDiagnostic.h"
19 #include "clang/Driver/Job.h"
20 #include "clang/Driver/Options.h"
21 #include "clang/Driver/SanitizerArgs.h"
22 #include "clang/Driver/XRayArgs.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/SmallString.h"
25 #include "llvm/ADT/StringRef.h"
26 #include "llvm/ADT/Triple.h"
27 #include "llvm/ADT/Twine.h"
28 #include "llvm/Config/llvm-config.h"
29 #include "llvm/MC/MCTargetOptions.h"
30 #include "llvm/Option/Arg.h"
31 #include "llvm/Option/ArgList.h"
32 #include "llvm/Option/OptTable.h"
33 #include "llvm/Option/Option.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/FileSystem.h"
36 #include "llvm/Support/Path.h"
37 #include "llvm/Support/TargetParser.h"
38 #include "llvm/Support/TargetRegistry.h"
39 #include "llvm/Support/VersionTuple.h"
40 #include "llvm/Support/VirtualFileSystem.h"
41 #include <cassert>
42 #include <cstddef>
43 #include <cstring>
44 #include <string>
45 
46 using namespace clang;
47 using namespace driver;
48 using namespace tools;
49 using namespace llvm;
50 using namespace llvm::opt;
51 
52 static llvm::opt::Arg *GetRTTIArgument(const ArgList &Args) {
53   return Args.getLastArg(options::OPT_mkernel, options::OPT_fapple_kext,
54                          options::OPT_fno_rtti, options::OPT_frtti);
55 }
56 
57 static ToolChain::RTTIMode CalculateRTTIMode(const ArgList &Args,
58                                              const llvm::Triple &Triple,
59                                              const Arg *CachedRTTIArg) {
60   // Explicit rtti/no-rtti args
61   if (CachedRTTIArg) {
62     if (CachedRTTIArg->getOption().matches(options::OPT_frtti))
63       return ToolChain::RM_Enabled;
64     else
65       return ToolChain::RM_Disabled;
66   }
67 
68   // -frtti is default, except for the PS4 CPU.
69   return (Triple.isPS4CPU()) ? ToolChain::RM_Disabled : ToolChain::RM_Enabled;
70 }
71 
72 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
73                      const ArgList &Args)
74     : D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
75       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
76   SmallString<128> P;
77 
78   P.assign(D.ResourceDir);
79   llvm::sys::path::append(P, D.getTargetTriple(), "lib");
80   if (getVFS().exists(P))
81     getLibraryPaths().push_back(P.str());
82 
83   P.assign(D.ResourceDir);
84   llvm::sys::path::append(P, Triple.str(), "lib");
85   if (getVFS().exists(P))
86     getLibraryPaths().push_back(P.str());
87 
88   std::string CandidateLibPath = getArchSpecificLibPath();
89   if (getVFS().exists(CandidateLibPath))
90     getFilePaths().push_back(CandidateLibPath);
91 }
92 
93 void ToolChain::setTripleEnvironment(llvm::Triple::EnvironmentType Env) {
94   Triple.setEnvironment(Env);
95   if (EffectiveTriple != llvm::Triple())
96     EffectiveTriple.setEnvironment(Env);
97 }
98 
99 ToolChain::~ToolChain() = default;
100 
101 llvm::vfs::FileSystem &ToolChain::getVFS() const {
102   return getDriver().getVFS();
103 }
104 
105 bool ToolChain::useIntegratedAs() const {
106   return Args.hasFlag(options::OPT_fintegrated_as,
107                       options::OPT_fno_integrated_as,
108                       IsIntegratedAssemblerDefault());
109 }
110 
111 bool ToolChain::useRelaxRelocations() const {
112   return ENABLE_X86_RELAX_RELOCATIONS;
113 }
114 
115 bool ToolChain::isNoExecStackDefault() const {
116     return false;
117 }
118 
119 const SanitizerArgs& ToolChain::getSanitizerArgs() const {
120   if (!SanitizerArguments.get())
121     SanitizerArguments.reset(new SanitizerArgs(*this, Args));
122   return *SanitizerArguments.get();
123 }
124 
125 const XRayArgs& ToolChain::getXRayArgs() const {
126   if (!XRayArguments.get())
127     XRayArguments.reset(new XRayArgs(*this, Args));
128   return *XRayArguments.get();
129 }
130 
131 namespace {
132 
133 struct DriverSuffix {
134   const char *Suffix;
135   const char *ModeFlag;
136 };
137 
138 } // namespace
139 
140 static const DriverSuffix *FindDriverSuffix(StringRef ProgName, size_t &Pos) {
141   // A list of known driver suffixes. Suffixes are compared against the
142   // program name in order. If there is a match, the frontend type is updated as
143   // necessary by applying the ModeFlag.
144   static const DriverSuffix DriverSuffixes[] = {
145       {"clang", nullptr},
146       {"clang++", "--driver-mode=g++"},
147       {"clang-c++", "--driver-mode=g++"},
148       {"clang-cc", nullptr},
149       {"clang-cpp", "--driver-mode=cpp"},
150       {"clang-g++", "--driver-mode=g++"},
151       {"clang-gcc", nullptr},
152       {"clang-cl", "--driver-mode=cl"},
153       {"cc", nullptr},
154       {"cpp", "--driver-mode=cpp"},
155       {"cl", "--driver-mode=cl"},
156       {"++", "--driver-mode=g++"},
157   };
158 
159   for (size_t i = 0; i < llvm::array_lengthof(DriverSuffixes); ++i) {
160     StringRef Suffix(DriverSuffixes[i].Suffix);
161     if (ProgName.endswith(Suffix)) {
162       Pos = ProgName.size() - Suffix.size();
163       return &DriverSuffixes[i];
164     }
165   }
166   return nullptr;
167 }
168 
169 /// Normalize the program name from argv[0] by stripping the file extension if
170 /// present and lower-casing the string on Windows.
171 static std::string normalizeProgramName(llvm::StringRef Argv0) {
172   std::string ProgName = llvm::sys::path::stem(Argv0);
173 #ifdef _WIN32
174   // Transform to lowercase for case insensitive file systems.
175   std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(), ::tolower);
176 #endif
177   return ProgName;
178 }
179 
180 static const DriverSuffix *parseDriverSuffix(StringRef ProgName, size_t &Pos) {
181   // Try to infer frontend type and default target from the program name by
182   // comparing it against DriverSuffixes in order.
183 
184   // If there is a match, the function tries to identify a target as prefix.
185   // E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
186   // prefix "x86_64-linux". If such a target prefix is found, it may be
187   // added via -target as implicit first argument.
188   const DriverSuffix *DS = FindDriverSuffix(ProgName, Pos);
189 
190   if (!DS) {
191     // Try again after stripping any trailing version number:
192     // clang++3.5 -> clang++
193     ProgName = ProgName.rtrim("0123456789.");
194     DS = FindDriverSuffix(ProgName, Pos);
195   }
196 
197   if (!DS) {
198     // Try again after stripping trailing -component.
199     // clang++-tot -> clang++
200     ProgName = ProgName.slice(0, ProgName.rfind('-'));
201     DS = FindDriverSuffix(ProgName, Pos);
202   }
203   return DS;
204 }
205 
206 ParsedClangName
207 ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
208   std::string ProgName = normalizeProgramName(PN);
209   size_t SuffixPos;
210   const DriverSuffix *DS = parseDriverSuffix(ProgName, SuffixPos);
211   if (!DS)
212     return {};
213   size_t SuffixEnd = SuffixPos + strlen(DS->Suffix);
214 
215   size_t LastComponent = ProgName.rfind('-', SuffixPos);
216   if (LastComponent == std::string::npos)
217     return ParsedClangName(ProgName.substr(0, SuffixEnd), DS->ModeFlag);
218   std::string ModeSuffix = ProgName.substr(LastComponent + 1,
219                                            SuffixEnd - LastComponent - 1);
220 
221   // Infer target from the prefix.
222   StringRef Prefix(ProgName);
223   Prefix = Prefix.slice(0, LastComponent);
224   std::string IgnoredError;
225   bool IsRegistered = llvm::TargetRegistry::lookupTarget(Prefix, IgnoredError);
226   return ParsedClangName{Prefix, ModeSuffix, DS->ModeFlag, IsRegistered};
227 }
228 
229 StringRef ToolChain::getDefaultUniversalArchName() const {
230   // In universal driver terms, the arch name accepted by -arch isn't exactly
231   // the same as the ones that appear in the triple. Roughly speaking, this is
232   // an inverse of the darwin::getArchTypeForDarwinArchName() function, but the
233   // only interesting special case is powerpc.
234   switch (Triple.getArch()) {
235   case llvm::Triple::ppc:
236     return "ppc";
237   case llvm::Triple::ppc64:
238     return "ppc64";
239   case llvm::Triple::ppc64le:
240     return "ppc64le";
241   default:
242     return Triple.getArchName();
243   }
244 }
245 
246 std::string ToolChain::getInputFilename(const InputInfo &Input) const {
247   return Input.getFilename();
248 }
249 
250 bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
251   return false;
252 }
253 
254 Tool *ToolChain::getClang() const {
255   if (!Clang)
256     Clang.reset(new tools::Clang(*this));
257   return Clang.get();
258 }
259 
260 Tool *ToolChain::buildAssembler() const {
261   return new tools::ClangAs(*this);
262 }
263 
264 Tool *ToolChain::buildLinker() const {
265   llvm_unreachable("Linking is not supported by this toolchain");
266 }
267 
268 Tool *ToolChain::getAssemble() const {
269   if (!Assemble)
270     Assemble.reset(buildAssembler());
271   return Assemble.get();
272 }
273 
274 Tool *ToolChain::getClangAs() const {
275   if (!Assemble)
276     Assemble.reset(new tools::ClangAs(*this));
277   return Assemble.get();
278 }
279 
280 Tool *ToolChain::getLink() const {
281   if (!Link)
282     Link.reset(buildLinker());
283   return Link.get();
284 }
285 
286 Tool *ToolChain::getOffloadBundler() const {
287   if (!OffloadBundler)
288     OffloadBundler.reset(new tools::OffloadBundler(*this));
289   return OffloadBundler.get();
290 }
291 
292 Tool *ToolChain::getTool(Action::ActionClass AC) const {
293   switch (AC) {
294   case Action::AssembleJobClass:
295     return getAssemble();
296 
297   case Action::LinkJobClass:
298     return getLink();
299 
300   case Action::InputClass:
301   case Action::BindArchClass:
302   case Action::OffloadClass:
303   case Action::LipoJobClass:
304   case Action::DsymutilJobClass:
305   case Action::VerifyDebugInfoJobClass:
306     llvm_unreachable("Invalid tool kind.");
307 
308   case Action::CompileJobClass:
309   case Action::PrecompileJobClass:
310   case Action::HeaderModulePrecompileJobClass:
311   case Action::PreprocessJobClass:
312   case Action::AnalyzeJobClass:
313   case Action::MigrateJobClass:
314   case Action::VerifyPCHJobClass:
315   case Action::BackendJobClass:
316     return getClang();
317 
318   case Action::OffloadBundlingJobClass:
319   case Action::OffloadUnbundlingJobClass:
320     return getOffloadBundler();
321   }
322 
323   llvm_unreachable("Invalid tool kind.");
324 }
325 
326 static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
327                                              const ArgList &Args) {
328   const llvm::Triple &Triple = TC.getTriple();
329   bool IsWindows = Triple.isOSWindows();
330 
331   if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
332     return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
333                ? "armhf"
334                : "arm";
335 
336   // For historic reasons, Android library is using i686 instead of i386.
337   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
338     return "i686";
339 
340   return llvm::Triple::getArchTypeName(TC.getArch());
341 }
342 
343 StringRef ToolChain::getOSLibName() const {
344   switch (Triple.getOS()) {
345   case llvm::Triple::FreeBSD:
346     return "freebsd";
347   case llvm::Triple::NetBSD:
348     return "netbsd";
349   case llvm::Triple::OpenBSD:
350     return "openbsd";
351   case llvm::Triple::Solaris:
352     return "sunos";
353   default:
354     return getOS();
355   }
356 }
357 
358 std::string ToolChain::getCompilerRTPath() const {
359   SmallString<128> Path(getDriver().ResourceDir);
360   if (Triple.isOSUnknown()) {
361     llvm::sys::path::append(Path, "lib");
362   } else {
363     llvm::sys::path::append(Path, "lib", getOSLibName());
364   }
365   return Path.str();
366 }
367 
368 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
369                                      FileType Type) const {
370   const llvm::Triple &TT = getTriple();
371   bool IsITANMSVCWindows =
372       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
373 
374   const char *Prefix =
375       IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
376   const char *Suffix;
377   switch (Type) {
378   case ToolChain::FT_Object:
379     Suffix = IsITANMSVCWindows ? ".obj" : ".o";
380     break;
381   case ToolChain::FT_Static:
382     Suffix = IsITANMSVCWindows ? ".lib" : ".a";
383     break;
384   case ToolChain::FT_Shared:
385     Suffix = Triple.isOSWindows()
386                  ? (Triple.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
387                  : ".so";
388     break;
389   }
390 
391   for (const auto &LibPath : getLibraryPaths()) {
392     SmallString<128> P(LibPath);
393     llvm::sys::path::append(P, Prefix + Twine("clang_rt.") + Component + Suffix);
394     if (getVFS().exists(P))
395       return P.str();
396   }
397 
398   StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
399   const char *Env = TT.isAndroid() ? "-android" : "";
400   SmallString<128> Path(getCompilerRTPath());
401   llvm::sys::path::append(Path, Prefix + Twine("clang_rt.") + Component + "-" +
402                                     Arch + Env + Suffix);
403   return Path.str();
404 }
405 
406 const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
407                                               StringRef Component,
408                                               FileType Type) const {
409   return Args.MakeArgString(getCompilerRT(Args, Component, Type));
410 }
411 
412 std::string ToolChain::getArchSpecificLibPath() const {
413   SmallString<128> Path(getDriver().ResourceDir);
414   llvm::sys::path::append(Path, "lib", getOSLibName(),
415                           llvm::Triple::getArchTypeName(getArch()));
416   return Path.str();
417 }
418 
419 bool ToolChain::needsProfileRT(const ArgList &Args) {
420   if (needsGCovInstrumentation(Args) ||
421       Args.hasArg(options::OPT_fprofile_generate) ||
422       Args.hasArg(options::OPT_fprofile_generate_EQ) ||
423       Args.hasArg(options::OPT_fcs_profile_generate) ||
424       Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
425       Args.hasArg(options::OPT_fprofile_instr_generate) ||
426       Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
427       Args.hasArg(options::OPT_fcreate_profile) ||
428       Args.hasArg(options::OPT_forder_file_instrumentation))
429     return true;
430 
431   return false;
432 }
433 
434 bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
435   return Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
436                       false) ||
437          Args.hasArg(options::OPT_coverage);
438 }
439 
440 Tool *ToolChain::SelectTool(const JobAction &JA) const {
441   if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
442   Action::ActionClass AC = JA.getKind();
443   if (AC == Action::AssembleJobClass && useIntegratedAs())
444     return getClangAs();
445   return getTool(AC);
446 }
447 
448 std::string ToolChain::GetFilePath(const char *Name) const {
449   return D.GetFilePath(Name, *this);
450 }
451 
452 std::string ToolChain::GetProgramPath(const char *Name) const {
453   return D.GetProgramPath(Name, *this);
454 }
455 
456 std::string ToolChain::GetLinkerPath() const {
457   const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
458   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
459 
460   if (llvm::sys::path::is_absolute(UseLinker)) {
461     // If we're passed what looks like an absolute path, don't attempt to
462     // second-guess that.
463     if (llvm::sys::fs::can_execute(UseLinker))
464       return UseLinker;
465   } else if (UseLinker.empty() || UseLinker == "ld") {
466     // If we're passed -fuse-ld= with no argument, or with the argument ld,
467     // then use whatever the default system linker is.
468     return GetProgramPath(getDefaultLinker());
469   } else {
470     llvm::SmallString<8> LinkerName;
471     if (Triple.isOSDarwin())
472       LinkerName.append("ld64.");
473     else
474       LinkerName.append("ld.");
475     LinkerName.append(UseLinker);
476 
477     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
478     if (llvm::sys::fs::can_execute(LinkerPath))
479       return LinkerPath;
480   }
481 
482   if (A)
483     getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
484 
485   return GetProgramPath(getDefaultLinker());
486 }
487 
488 types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
489   return types::lookupTypeForExtension(Ext);
490 }
491 
492 bool ToolChain::HasNativeLLVMSupport() const {
493   return false;
494 }
495 
496 bool ToolChain::isCrossCompiling() const {
497   llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
498   switch (HostTriple.getArch()) {
499   // The A32/T32/T16 instruction sets are not separate architectures in this
500   // context.
501   case llvm::Triple::arm:
502   case llvm::Triple::armeb:
503   case llvm::Triple::thumb:
504   case llvm::Triple::thumbeb:
505     return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
506            getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
507   default:
508     return HostTriple.getArch() != getArch();
509   }
510 }
511 
512 ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
513   return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
514                      VersionTuple());
515 }
516 
517 llvm::ExceptionHandling
518 ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
519   return llvm::ExceptionHandling::None;
520 }
521 
522 bool ToolChain::isThreadModelSupported(const StringRef Model) const {
523   if (Model == "single") {
524     // FIXME: 'single' is only supported on ARM and WebAssembly so far.
525     return Triple.getArch() == llvm::Triple::arm ||
526            Triple.getArch() == llvm::Triple::armeb ||
527            Triple.getArch() == llvm::Triple::thumb ||
528            Triple.getArch() == llvm::Triple::thumbeb ||
529            Triple.getArch() == llvm::Triple::wasm32 ||
530            Triple.getArch() == llvm::Triple::wasm64;
531   } else if (Model == "posix")
532     return true;
533 
534   return false;
535 }
536 
537 std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
538                                          types::ID InputType) const {
539   switch (getTriple().getArch()) {
540   default:
541     return getTripleString();
542 
543   case llvm::Triple::x86_64: {
544     llvm::Triple Triple = getTriple();
545     if (!Triple.isOSBinFormatMachO())
546       return getTripleString();
547 
548     if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
549       // x86_64h goes in the triple. Other -march options just use the
550       // vanilla triple we already have.
551       StringRef MArch = A->getValue();
552       if (MArch == "x86_64h")
553         Triple.setArchName(MArch);
554     }
555     return Triple.getTriple();
556   }
557   case llvm::Triple::aarch64: {
558     llvm::Triple Triple = getTriple();
559     if (!Triple.isOSBinFormatMachO())
560       return getTripleString();
561 
562     // FIXME: older versions of ld64 expect the "arm64" component in the actual
563     // triple string and query it to determine whether an LTO file can be
564     // handled. Remove this when we don't care any more.
565     Triple.setArchName("arm64");
566     return Triple.getTriple();
567   }
568   case llvm::Triple::arm:
569   case llvm::Triple::armeb:
570   case llvm::Triple::thumb:
571   case llvm::Triple::thumbeb: {
572     // FIXME: Factor into subclasses.
573     llvm::Triple Triple = getTriple();
574     bool IsBigEndian = getTriple().getArch() == llvm::Triple::armeb ||
575                        getTriple().getArch() == llvm::Triple::thumbeb;
576 
577     // Handle pseudo-target flags '-mlittle-endian'/'-EL' and
578     // '-mbig-endian'/'-EB'.
579     if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
580                                  options::OPT_mbig_endian)) {
581       IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
582     }
583 
584     // Thumb2 is the default for V7 on Darwin.
585     //
586     // FIXME: Thumb should just be another -target-feaure, not in the triple.
587     StringRef MCPU, MArch;
588     if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
589       MCPU = A->getValue();
590     if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
591       MArch = A->getValue();
592     std::string CPU =
593         Triple.isOSBinFormatMachO()
594             ? tools::arm::getARMCPUForMArch(MArch, Triple).str()
595             : tools::arm::getARMTargetCPU(MCPU, MArch, Triple);
596     StringRef Suffix =
597       tools::arm::getLLVMArchSuffixForARM(CPU, MArch, Triple);
598     bool IsMProfile = ARM::parseArchProfile(Suffix) == ARM::ProfileKind::M;
599     bool ThumbDefault = IsMProfile || (ARM::parseArchVersion(Suffix) == 7 &&
600                                        getTriple().isOSBinFormatMachO());
601     // FIXME: this is invalid for WindowsCE
602     if (getTriple().isOSWindows())
603       ThumbDefault = true;
604     std::string ArchName;
605     if (IsBigEndian)
606       ArchName = "armeb";
607     else
608       ArchName = "arm";
609 
610     // Check if ARM ISA was explicitly selected (using -mno-thumb or -marm) for
611     // M-Class CPUs/architecture variants, which is not supported.
612     bool ARMModeRequested = !Args.hasFlag(options::OPT_mthumb,
613                                           options::OPT_mno_thumb, ThumbDefault);
614     if (IsMProfile && ARMModeRequested) {
615       if (!MCPU.empty())
616         getDriver().Diag(diag::err_cpu_unsupported_isa) << CPU << "ARM";
617        else
618         getDriver().Diag(diag::err_arch_unsupported_isa)
619           << tools::arm::getARMArch(MArch, getTriple()) << "ARM";
620     }
621 
622     // Check to see if an explicit choice to use thumb has been made via
623     // -mthumb. For assembler files we must check for -mthumb in the options
624     // passed to the assembler via -Wa or -Xassembler.
625     bool IsThumb = false;
626     if (InputType != types::TY_PP_Asm)
627       IsThumb = Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb,
628                               ThumbDefault);
629     else {
630       // Ideally we would check for these flags in
631       // CollectArgsForIntegratedAssembler but we can't change the ArchName at
632       // that point. There is no assembler equivalent of -mno-thumb, -marm, or
633       // -mno-arm.
634       for (const auto *A :
635            Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler)) {
636         for (StringRef Value : A->getValues()) {
637           if (Value == "-mthumb")
638             IsThumb = true;
639         }
640       }
641     }
642     // Assembly files should start in ARM mode, unless arch is M-profile, or
643     // -mthumb has been passed explicitly to the assembler. Windows is always
644     // thumb.
645     if (IsThumb || IsMProfile || getTriple().isOSWindows()) {
646       if (IsBigEndian)
647         ArchName = "thumbeb";
648       else
649         ArchName = "thumb";
650     }
651     Triple.setArchName(ArchName + Suffix.str());
652 
653     return Triple.getTriple();
654   }
655   }
656 }
657 
658 std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
659                                                    types::ID InputType) const {
660   return ComputeLLVMTriple(Args, InputType);
661 }
662 
663 void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
664                                           ArgStringList &CC1Args) const {
665   // Each toolchain should provide the appropriate include flags.
666 }
667 
668 void ToolChain::addClangTargetOptions(
669     const ArgList &DriverArgs, ArgStringList &CC1Args,
670     Action::OffloadKind DeviceOffloadKind) const {}
671 
672 void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
673 
674 void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
675                                  llvm::opt::ArgStringList &CmdArgs) const {
676   if (!needsProfileRT(Args)) return;
677 
678   CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
679 }
680 
681 ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
682     const ArgList &Args) const {
683   const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
684   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
685 
686   // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
687   if (LibName == "compiler-rt")
688     return ToolChain::RLT_CompilerRT;
689   else if (LibName == "libgcc")
690     return ToolChain::RLT_Libgcc;
691   else if (LibName == "platform")
692     return GetDefaultRuntimeLibType();
693 
694   if (A)
695     getDriver().Diag(diag::err_drv_invalid_rtlib_name) << A->getAsString(Args);
696 
697   return GetDefaultRuntimeLibType();
698 }
699 
700 ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
701     const ArgList &Args) const {
702   const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
703   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
704 
705   if (LibName == "none")
706     return ToolChain::UNW_None;
707   else if (LibName == "platform" || LibName == "") {
708     ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
709     if (RtLibType == ToolChain::RLT_CompilerRT)
710       return ToolChain::UNW_None;
711     else if (RtLibType == ToolChain::RLT_Libgcc)
712       return ToolChain::UNW_Libgcc;
713   } else if (LibName == "libunwind") {
714     if (GetRuntimeLibType(Args) == RLT_Libgcc)
715       getDriver().Diag(diag::err_drv_incompatible_unwindlib);
716     return ToolChain::UNW_CompilerRT;
717   } else if (LibName == "libgcc")
718     return ToolChain::UNW_Libgcc;
719 
720   if (A)
721     getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
722         << A->getAsString(Args);
723 
724   return GetDefaultUnwindLibType();
725 }
726 
727 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
728   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
729   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
730 
731   // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
732   if (LibName == "libc++")
733     return ToolChain::CST_Libcxx;
734   else if (LibName == "libstdc++")
735     return ToolChain::CST_Libstdcxx;
736   else if (LibName == "platform")
737     return GetDefaultCXXStdlibType();
738 
739   if (A)
740     getDriver().Diag(diag::err_drv_invalid_stdlib_name) << A->getAsString(Args);
741 
742   return GetDefaultCXXStdlibType();
743 }
744 
745 /// Utility function to add a system include directory to CC1 arguments.
746 /*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
747                                             ArgStringList &CC1Args,
748                                             const Twine &Path) {
749   CC1Args.push_back("-internal-isystem");
750   CC1Args.push_back(DriverArgs.MakeArgString(Path));
751 }
752 
753 /// Utility function to add a system include directory with extern "C"
754 /// semantics to CC1 arguments.
755 ///
756 /// Note that this should be used rarely, and only for directories that
757 /// historically and for legacy reasons are treated as having implicit extern
758 /// "C" semantics. These semantics are *ignored* by and large today, but its
759 /// important to preserve the preprocessor changes resulting from the
760 /// classification.
761 /*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
762                                                    ArgStringList &CC1Args,
763                                                    const Twine &Path) {
764   CC1Args.push_back("-internal-externc-isystem");
765   CC1Args.push_back(DriverArgs.MakeArgString(Path));
766 }
767 
768 void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
769                                                 ArgStringList &CC1Args,
770                                                 const Twine &Path) {
771   if (llvm::sys::fs::exists(Path))
772     addExternCSystemInclude(DriverArgs, CC1Args, Path);
773 }
774 
775 /// Utility function to add a list of system include directories to CC1.
776 /*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
777                                              ArgStringList &CC1Args,
778                                              ArrayRef<StringRef> Paths) {
779   for (const auto Path : Paths) {
780     CC1Args.push_back("-internal-isystem");
781     CC1Args.push_back(DriverArgs.MakeArgString(Path));
782   }
783 }
784 
785 void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
786                                              ArgStringList &CC1Args) const {
787   // Header search paths should be handled by each of the subclasses.
788   // Historically, they have not been, and instead have been handled inside of
789   // the CC1-layer frontend. As the logic is hoisted out, this generic function
790   // will slowly stop being called.
791   //
792   // While it is being called, replicate a bit of a hack to propagate the
793   // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
794   // header search paths with it. Once all systems are overriding this
795   // function, the CC1 flag and this line can be removed.
796   DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
797 }
798 
799 bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
800   return getDriver().CCCIsCXX() &&
801          !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
802                       options::OPT_nostdlibxx);
803 }
804 
805 void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
806                                     ArgStringList &CmdArgs) const {
807   assert(!Args.hasArg(options::OPT_nostdlibxx) &&
808          "should not have called this");
809   CXXStdlibType Type = GetCXXStdlibType(Args);
810 
811   switch (Type) {
812   case ToolChain::CST_Libcxx:
813     CmdArgs.push_back("-lc++");
814     break;
815 
816   case ToolChain::CST_Libstdcxx:
817     CmdArgs.push_back("-lstdc++");
818     break;
819   }
820 }
821 
822 void ToolChain::AddFilePathLibArgs(const ArgList &Args,
823                                    ArgStringList &CmdArgs) const {
824   for (const auto &LibPath : getLibraryPaths())
825     if(LibPath.length() > 0)
826       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
827 
828   for (const auto &LibPath : getFilePaths())
829     if(LibPath.length() > 0)
830       CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
831 }
832 
833 void ToolChain::AddCCKextLibArgs(const ArgList &Args,
834                                  ArgStringList &CmdArgs) const {
835   CmdArgs.push_back("-lcc_kext");
836 }
837 
838 bool ToolChain::AddFastMathRuntimeIfAvailable(const ArgList &Args,
839                                               ArgStringList &CmdArgs) const {
840   // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
841   // (to keep the linker options consistent with gcc and clang itself).
842   if (!isOptimizationLevelFast(Args)) {
843     // Check if -ffast-math or -funsafe-math.
844     Arg *A =
845         Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
846                         options::OPT_funsafe_math_optimizations,
847                         options::OPT_fno_unsafe_math_optimizations);
848 
849     if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
850         A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
851       return false;
852   }
853   // If crtfastmath.o exists add it to the arguments.
854   std::string Path = GetFilePath("crtfastmath.o");
855   if (Path == "crtfastmath.o") // Not found.
856     return false;
857 
858   CmdArgs.push_back(Args.MakeArgString(Path));
859   return true;
860 }
861 
862 SanitizerMask ToolChain::getSupportedSanitizers() const {
863   // Return sanitizers which don't require runtime support and are not
864   // platform dependent.
865 
866   SanitizerMask Res = (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
867                        ~SanitizerKind::Function) |
868                       (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
869                       SanitizerKind::CFICastStrict |
870                       SanitizerKind::UnsignedIntegerOverflow |
871                       SanitizerKind::ImplicitConversion |
872                       SanitizerKind::Nullability | SanitizerKind::LocalBounds;
873   if (getTriple().getArch() == llvm::Triple::x86 ||
874       getTriple().getArch() == llvm::Triple::x86_64 ||
875       getTriple().getArch() == llvm::Triple::arm ||
876       getTriple().getArch() == llvm::Triple::aarch64 ||
877       getTriple().getArch() == llvm::Triple::wasm32 ||
878       getTriple().getArch() == llvm::Triple::wasm64)
879     Res |= SanitizerKind::CFIICall;
880   if (getTriple().getArch() == llvm::Triple::x86_64 ||
881       getTriple().getArch() == llvm::Triple::aarch64)
882     Res |= SanitizerKind::ShadowCallStack;
883   return Res;
884 }
885 
886 void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
887                                    ArgStringList &CC1Args) const {}
888 
889 void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
890                                     ArgStringList &CC1Args) const {}
891 
892 static VersionTuple separateMSVCFullVersion(unsigned Version) {
893   if (Version < 100)
894     return VersionTuple(Version);
895 
896   if (Version < 10000)
897     return VersionTuple(Version / 100, Version % 100);
898 
899   unsigned Build = 0, Factor = 1;
900   for (; Version > 10000; Version = Version / 10, Factor = Factor * 10)
901     Build = Build + (Version % 10) * Factor;
902   return VersionTuple(Version / 100, Version % 100, Build);
903 }
904 
905 VersionTuple
906 ToolChain::computeMSVCVersion(const Driver *D,
907                               const llvm::opt::ArgList &Args) const {
908   const Arg *MSCVersion = Args.getLastArg(options::OPT_fmsc_version);
909   const Arg *MSCompatibilityVersion =
910       Args.getLastArg(options::OPT_fms_compatibility_version);
911 
912   if (MSCVersion && MSCompatibilityVersion) {
913     if (D)
914       D->Diag(diag::err_drv_argument_not_allowed_with)
915           << MSCVersion->getAsString(Args)
916           << MSCompatibilityVersion->getAsString(Args);
917     return VersionTuple();
918   }
919 
920   if (MSCompatibilityVersion) {
921     VersionTuple MSVT;
922     if (MSVT.tryParse(MSCompatibilityVersion->getValue())) {
923       if (D)
924         D->Diag(diag::err_drv_invalid_value)
925             << MSCompatibilityVersion->getAsString(Args)
926             << MSCompatibilityVersion->getValue();
927     } else {
928       return MSVT;
929     }
930   }
931 
932   if (MSCVersion) {
933     unsigned Version = 0;
934     if (StringRef(MSCVersion->getValue()).getAsInteger(10, Version)) {
935       if (D)
936         D->Diag(diag::err_drv_invalid_value)
937             << MSCVersion->getAsString(Args) << MSCVersion->getValue();
938     } else {
939       return separateMSVCFullVersion(Version);
940     }
941   }
942 
943   return VersionTuple();
944 }
945 
946 llvm::opt::DerivedArgList *ToolChain::TranslateOpenMPTargetArgs(
947     const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
948     SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const {
949   DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
950   const OptTable &Opts = getDriver().getOpts();
951   bool Modified = false;
952 
953   // Handle -Xopenmp-target flags
954   for (auto *A : Args) {
955     // Exclude flags which may only apply to the host toolchain.
956     // Do not exclude flags when the host triple (AuxTriple)
957     // matches the current toolchain triple. If it is not present
958     // at all, target and host share a toolchain.
959     if (A->getOption().matches(options::OPT_m_Group)) {
960       if (SameTripleAsHost)
961         DAL->append(A);
962       else
963         Modified = true;
964       continue;
965     }
966 
967     unsigned Index;
968     unsigned Prev;
969     bool XOpenMPTargetNoTriple =
970         A->getOption().matches(options::OPT_Xopenmp_target);
971 
972     if (A->getOption().matches(options::OPT_Xopenmp_target_EQ)) {
973       // Passing device args: -Xopenmp-target=<triple> -opt=val.
974       if (A->getValue(0) == getTripleString())
975         Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
976       else
977         continue;
978     } else if (XOpenMPTargetNoTriple) {
979       // Passing device args: -Xopenmp-target -opt=val.
980       Index = Args.getBaseArgs().MakeIndex(A->getValue(0));
981     } else {
982       DAL->append(A);
983       continue;
984     }
985 
986     // Parse the argument to -Xopenmp-target.
987     Prev = Index;
988     std::unique_ptr<Arg> XOpenMPTargetArg(Opts.ParseOneArg(Args, Index));
989     if (!XOpenMPTargetArg || Index > Prev + 1) {
990       getDriver().Diag(diag::err_drv_invalid_Xopenmp_target_with_args)
991           << A->getAsString(Args);
992       continue;
993     }
994     if (XOpenMPTargetNoTriple && XOpenMPTargetArg &&
995         Args.getAllArgValues(options::OPT_fopenmp_targets_EQ).size() != 1) {
996       getDriver().Diag(diag::err_drv_Xopenmp_target_missing_triple);
997       continue;
998     }
999     XOpenMPTargetArg->setBaseArg(A);
1000     A = XOpenMPTargetArg.release();
1001     AllocatedArgs.push_back(A);
1002     DAL->append(A);
1003     Modified = true;
1004   }
1005 
1006   if (Modified)
1007     return DAL;
1008 
1009   delete DAL;
1010   return nullptr;
1011 }
1012