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
48using namespace clang;
49using namespace driver;
50using namespace tools;
51using namespace llvm;
52using namespace llvm::opt;
53
54static 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
59static 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
74ToolChain::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
91void ToolChain::setTripleEnvironment(llvm::Triple::EnvironmentType Env) {
92  Triple.setEnvironment(Env);
93  if (EffectiveTriple != llvm::Triple())
94    EffectiveTriple.setEnvironment(Env);
95}
96
97ToolChain::~ToolChain() = default;
98
99llvm::vfs::FileSystem &ToolChain::getVFS() const {
100  return getDriver().getVFS();
101}
102
103bool ToolChain::useIntegratedAs() const {
104  return Args.hasFlag(options::OPT_fintegrated_as,
105                      options::OPT_fno_integrated_as,
106                      IsIntegratedAssemblerDefault());
107}
108
109bool ToolChain::useRelaxRelocations() const {
110  return ENABLE_X86_RELAX_RELOCATIONS;
111}
112
113bool ToolChain::isNoExecStackDefault() const {
114    return false;
115}
116
117const SanitizerArgs& ToolChain::getSanitizerArgs() const {
118  if (!SanitizerArguments.get())
119    SanitizerArguments.reset(new SanitizerArgs(*this, Args));
120  return *SanitizerArguments.get();
121}
122
123const XRayArgs& ToolChain::getXRayArgs() const {
124  if (!XRayArguments.get())
125    XRayArguments.reset(new XRayArgs(*this, Args));
126  return *XRayArguments.get();
127}
128
129namespace {
130
131struct DriverSuffix {
132  const char *Suffix;
133  const char *ModeFlag;
134};
135
136} // namespace
137
138static 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.
170static 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
179static 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
205ParsedClangName
206ToolChain::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
230StringRef 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
250std::string ToolChain::getInputFilename(const InputInfo &Input) const {
251  return Input.getFilename();
252}
253
254bool ToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
255  return false;
256}
257
258Tool *ToolChain::getClang() const {
259  if (!Clang)
260    Clang.reset(new tools::Clang(*this));
261  return Clang.get();
262}
263
264Tool *ToolChain::getFlang() const {
265  if (!Flang)
266    Flang.reset(new tools::Flang(*this));
267  return Flang.get();
268}
269
270Tool *ToolChain::buildAssembler() const {
271  return new tools::ClangAs(*this);
272}
273
274Tool *ToolChain::buildLinker() const {
275  llvm_unreachable("Linking is not supported by this toolchain");
276}
277
278Tool *ToolChain::buildStaticLibTool() const {
279  llvm_unreachable("Creating static lib is not supported by this toolchain");
280}
281
282Tool *ToolChain::getAssemble() const {
283  if (!Assemble)
284    Assemble.reset(buildAssembler());
285  return Assemble.get();
286}
287
288Tool *ToolChain::getClangAs() const {
289  if (!Assemble)
290    Assemble.reset(new tools::ClangAs(*this));
291  return Assemble.get();
292}
293
294Tool *ToolChain::getLink() const {
295  if (!Link)
296    Link.reset(buildLinker());
297  return Link.get();
298}
299
300Tool *ToolChain::getStaticLibTool() const {
301  if (!StaticLibTool)
302    StaticLibTool.reset(buildStaticLibTool());
303  return StaticLibTool.get();
304}
305
306Tool *ToolChain::getIfsMerge() const {
307  if (!IfsMerge)
308    IfsMerge.reset(new tools::ifstool::Merger(*this));
309  return IfsMerge.get();
310}
311
312Tool *ToolChain::getOffloadBundler() const {
313  if (!OffloadBundler)
314    OffloadBundler.reset(new tools::OffloadBundler(*this));
315  return OffloadBundler.get();
316}
317
318Tool *ToolChain::getOffloadWrapper() const {
319  if (!OffloadWrapper)
320    OffloadWrapper.reset(new tools::OffloadWrapper(*this));
321  return OffloadWrapper.get();
322}
323
324Tool *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
367static 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
384StringRef 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  default:
395    return getOS();
396  }
397}
398
399std::string ToolChain::getCompilerRTPath() const {
400  SmallString<128> Path(getDriver().ResourceDir);
401  if (Triple.isOSUnknown()) {
402    llvm::sys::path::append(Path, "lib");
403  } else {
404    llvm::sys::path::append(Path, "lib", getOSLibName());
405  }
406  return std::string(Path.str());
407}
408
409std::string ToolChain::getCompilerRTBasename(const ArgList &Args,
410                                             StringRef Component, FileType Type,
411                                             bool AddArch) const {
412  const llvm::Triple &TT = getTriple();
413  bool IsITANMSVCWindows =
414      TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
415
416  const char *Prefix =
417      IsITANMSVCWindows || Type == ToolChain::FT_Object ? "" : "lib";
418  const char *Suffix;
419  switch (Type) {
420  case ToolChain::FT_Object:
421    Suffix = IsITANMSVCWindows ? ".obj" : ".o";
422    break;
423  case ToolChain::FT_Static:
424    Suffix = IsITANMSVCWindows ? ".lib" : ".a";
425    break;
426  case ToolChain::FT_Shared:
427    Suffix = Triple.isOSWindows()
428                 ? (Triple.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
429                 : ".so";
430    break;
431  }
432
433  std::string ArchAndEnv;
434  if (AddArch) {
435    StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
436    const char *Env = TT.isAndroid() ? "-android" : "";
437    ArchAndEnv = ("-" + Arch + Env).str();
438  }
439  return (Prefix + Twine("clang_rt.") + Component + ArchAndEnv + Suffix).str();
440}
441
442std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
443                                     FileType Type) const {
444  // Check for runtime files in the new layout without the architecture first.
445  std::string CRTBasename =
446      getCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
447  for (const auto &LibPath : getLibraryPaths()) {
448    SmallString<128> P(LibPath);
449    llvm::sys::path::append(P, CRTBasename);
450    if (getVFS().exists(P))
451      return std::string(P.str());
452  }
453
454  // Fall back to the old expected compiler-rt name if the new one does not
455  // exist.
456  CRTBasename = getCompilerRTBasename(Args, Component, Type, /*AddArch=*/true);
457  SmallString<128> Path(getCompilerRTPath());
458  llvm::sys::path::append(Path, CRTBasename);
459  return std::string(Path.str());
460}
461
462const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
463                                              StringRef Component,
464                                              FileType Type) const {
465  return Args.MakeArgString(getCompilerRT(Args, Component, Type));
466}
467
468
469Optional<std::string> ToolChain::getRuntimePath() const {
470  SmallString<128> P;
471
472  // First try the triple passed to driver as --target=<triple>.
473  P.assign(D.ResourceDir);
474  llvm::sys::path::append(P, "lib", D.getTargetTriple());
475  if (getVFS().exists(P))
476    return llvm::Optional<std::string>(std::string(P.str()));
477
478  // Second try the normalized triple.
479  P.assign(D.ResourceDir);
480  llvm::sys::path::append(P, "lib", Triple.str());
481  if (getVFS().exists(P))
482    return llvm::Optional<std::string>(std::string(P.str()));
483
484  return None;
485}
486
487Optional<std::string> ToolChain::getCXXStdlibPath() const {
488  SmallString<128> P;
489
490  // First try the triple passed to driver as --target=<triple>.
491  P.assign(D.Dir);
492  llvm::sys::path::append(P, "..", "lib", D.getTargetTriple(), "c++");
493  if (getVFS().exists(P))
494    return llvm::Optional<std::string>(std::string(P.str()));
495
496  // Second try the normalized triple.
497  P.assign(D.Dir);
498  llvm::sys::path::append(P, "..", "lib", Triple.str(), "c++");
499  if (getVFS().exists(P))
500    return llvm::Optional<std::string>(std::string(P.str()));
501
502  return None;
503}
504
505std::string ToolChain::getArchSpecificLibPath() const {
506  SmallString<128> Path(getDriver().ResourceDir);
507  llvm::sys::path::append(Path, "lib", getOSLibName(),
508                          llvm::Triple::getArchTypeName(getArch()));
509  return std::string(Path.str());
510}
511
512bool ToolChain::needsProfileRT(const ArgList &Args) {
513  if (Args.hasArg(options::OPT_noprofilelib))
514    return false;
515
516  return Args.hasArg(options::OPT_fprofile_generate) ||
517         Args.hasArg(options::OPT_fprofile_generate_EQ) ||
518         Args.hasArg(options::OPT_fcs_profile_generate) ||
519         Args.hasArg(options::OPT_fcs_profile_generate_EQ) ||
520         Args.hasArg(options::OPT_fprofile_instr_generate) ||
521         Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
522         Args.hasArg(options::OPT_fcreate_profile) ||
523         Args.hasArg(options::OPT_forder_file_instrumentation);
524}
525
526bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
527  return Args.hasArg(options::OPT_coverage) ||
528         Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
529                      false);
530}
531
532Tool *ToolChain::SelectTool(const JobAction &JA) const {
533  if (D.IsFlangMode() && getDriver().ShouldUseFlangCompiler(JA)) return getFlang();
534  if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
535  Action::ActionClass AC = JA.getKind();
536  if (AC == Action::AssembleJobClass && useIntegratedAs())
537    return getClangAs();
538  return getTool(AC);
539}
540
541std::string ToolChain::GetFilePath(const char *Name) const {
542  return D.GetFilePath(Name, *this);
543}
544
545std::string ToolChain::GetProgramPath(const char *Name) const {
546  return D.GetProgramPath(Name, *this);
547}
548
549std::string ToolChain::GetLinkerPath() const {
550  const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ);
551  StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
552
553  if (llvm::sys::path::is_absolute(UseLinker)) {
554    // If we're passed what looks like an absolute path, don't attempt to
555    // second-guess that.
556    if (llvm::sys::fs::can_execute(UseLinker))
557      return std::string(UseLinker);
558  } else if (UseLinker.empty() || UseLinker == "ld") {
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    return GetProgramPath(getDefaultLinker());
562  } else {
563    llvm::SmallString<8> LinkerName;
564    if (Triple.isOSDarwin())
565      LinkerName.append("ld64.");
566    else
567      LinkerName.append("ld.");
568    LinkerName.append(UseLinker);
569
570    std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
571    if (llvm::sys::fs::can_execute(LinkerPath))
572      return LinkerPath;
573  }
574
575  if (A)
576    getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
577
578  return GetProgramPath(getDefaultLinker());
579}
580
581std::string ToolChain::GetStaticLibToolPath() const {
582  // TODO: Add support for static lib archiving on Windows
583  return GetProgramPath("llvm-ar");
584}
585
586types::ID ToolChain::LookupTypeForExtension(StringRef Ext) const {
587  types::ID id = types::lookupTypeForExtension(Ext);
588
589  // Flang always runs the preprocessor and has no notion of "preprocessed
590  // fortran". Here, TY_PP_Fortran is coerced to TY_Fortran to avoid treating
591  // them differently.
592  if (D.IsFlangMode() && id == types::TY_PP_Fortran)
593    id = types::TY_Fortran;
594
595  return id;
596}
597
598bool ToolChain::HasNativeLLVMSupport() const {
599  return false;
600}
601
602bool ToolChain::isCrossCompiling() const {
603  llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
604  switch (HostTriple.getArch()) {
605  // The A32/T32/T16 instruction sets are not separate architectures in this
606  // context.
607  case llvm::Triple::arm:
608  case llvm::Triple::armeb:
609  case llvm::Triple::thumb:
610  case llvm::Triple::thumbeb:
611    return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
612           getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
613  default:
614    return HostTriple.getArch() != getArch();
615  }
616}
617
618ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
619  return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
620                     VersionTuple());
621}
622
623llvm::ExceptionHandling
624ToolChain::GetExceptionModel(const llvm::opt::ArgList &Args) const {
625  return llvm::ExceptionHandling::None;
626}
627
628bool ToolChain::isThreadModelSupported(const StringRef Model) const {
629  if (Model == "single") {
630    // FIXME: 'single' is only supported on ARM and WebAssembly so far.
631    return Triple.getArch() == llvm::Triple::arm ||
632           Triple.getArch() == llvm::Triple::armeb ||
633           Triple.getArch() == llvm::Triple::thumb ||
634           Triple.getArch() == llvm::Triple::thumbeb ||
635           Triple.getArch() == llvm::Triple::wasm32 ||
636           Triple.getArch() == llvm::Triple::wasm64;
637  } else if (Model == "posix")
638    return true;
639
640  return false;
641}
642
643std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
644                                         types::ID InputType) const {
645  switch (getTriple().getArch()) {
646  default:
647    return getTripleString();
648
649  case llvm::Triple::x86_64: {
650    llvm::Triple Triple = getTriple();
651    if (!Triple.isOSBinFormatMachO())
652      return getTripleString();
653
654    if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
655      // x86_64h goes in the triple. Other -march options just use the
656      // vanilla triple we already have.
657      StringRef MArch = A->getValue();
658      if (MArch == "x86_64h")
659        Triple.setArchName(MArch);
660    }
661    return Triple.getTriple();
662  }
663  case llvm::Triple::aarch64: {
664    llvm::Triple Triple = getTriple();
665    if (!Triple.isOSBinFormatMachO())
666      return getTripleString();
667
668    // FIXME: older versions of ld64 expect the "arm64" component in the actual
669    // triple string and query it to determine whether an LTO file can be
670    // handled. Remove this when we don't care any more.
671    Triple.setArchName("arm64");
672    return Triple.getTriple();
673  }
674  case llvm::Triple::aarch64_32:
675    return getTripleString();
676  case llvm::Triple::arm:
677  case llvm::Triple::armeb:
678  case llvm::Triple::thumb:
679  case llvm::Triple::thumbeb: {
680    // FIXME: Factor into subclasses.
681    llvm::Triple Triple = getTriple();
682    bool IsBigEndian = getTriple().getArch() == llvm::Triple::armeb ||
683                       getTriple().getArch() == llvm::Triple::thumbeb;
684
685    // Handle pseudo-target flags '-mlittle-endian'/'-EL' and
686    // '-mbig-endian'/'-EB'.
687    if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
688                                 options::OPT_mbig_endian)) {
689      IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
690    }
691
692    // Thumb2 is the default for V7 on Darwin.
693    //
694    // FIXME: Thumb should just be another -target-feaure, not in the triple.
695    StringRef MCPU, MArch;
696    if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
697      MCPU = A->getValue();
698    if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
699      MArch = A->getValue();
700    std::string CPU =
701        Triple.isOSBinFormatMachO()
702            ? tools::arm::getARMCPUForMArch(MArch, Triple).str()
703            : tools::arm::getARMTargetCPU(MCPU, MArch, Triple);
704    StringRef Suffix =
705      tools::arm::getLLVMArchSuffixForARM(CPU, MArch, Triple);
706    bool IsMProfile = ARM::parseArchProfile(Suffix) == ARM::ProfileKind::M;
707    bool ThumbDefault = IsMProfile || (ARM::parseArchVersion(Suffix) == 7 &&
708                                       getTriple().isOSBinFormatMachO());
709    // FIXME: this is invalid for WindowsCE
710    if (getTriple().isOSWindows())
711      ThumbDefault = true;
712    std::string ArchName;
713    if (IsBigEndian)
714      ArchName = "armeb";
715    else
716      ArchName = "arm";
717
718    // Check if ARM ISA was explicitly selected (using -mno-thumb or -marm) for
719    // M-Class CPUs/architecture variants, which is not supported.
720    bool ARMModeRequested = !Args.hasFlag(options::OPT_mthumb,
721                                          options::OPT_mno_thumb, ThumbDefault);
722    if (IsMProfile && ARMModeRequested) {
723      if (!MCPU.empty())
724        getDriver().Diag(diag::err_cpu_unsupported_isa) << CPU << "ARM";
725       else
726        getDriver().Diag(diag::err_arch_unsupported_isa)
727          << tools::arm::getARMArch(MArch, getTriple()) << "ARM";
728    }
729
730    // Check to see if an explicit choice to use thumb has been made via
731    // -mthumb. For assembler files we must check for -mthumb in the options
732    // passed to the assembler via -Wa or -Xassembler.
733    bool IsThumb = false;
734    if (InputType != types::TY_PP_Asm)
735      IsThumb = Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb,
736                              ThumbDefault);
737    else {
738      // Ideally we would check for these flags in
739      // CollectArgsForIntegratedAssembler but we can't change the ArchName at
740      // that point. There is no assembler equivalent of -mno-thumb, -marm, or
741      // -mno-arm.
742      for (const auto *A :
743           Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler)) {
744        for (StringRef Value : A->getValues()) {
745          if (Value == "-mthumb")
746            IsThumb = true;
747        }
748      }
749    }
750    // Assembly files should start in ARM mode, unless arch is M-profile, or
751    // -mthumb has been passed explicitly to the assembler. Windows is always
752    // thumb.
753    if (IsThumb || IsMProfile || getTriple().isOSWindows()) {
754      if (IsBigEndian)
755        ArchName = "thumbeb";
756      else
757        ArchName = "thumb";
758    }
759    Triple.setArchName(ArchName + Suffix.str());
760
761    return Triple.getTriple();
762  }
763  }
764}
765
766std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
767                                                   types::ID InputType) const {
768  return ComputeLLVMTriple(Args, InputType);
769}
770
771std::string ToolChain::computeSysRoot() const {
772  return D.SysRoot;
773}
774
775void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
776                                          ArgStringList &CC1Args) const {
777  // Each toolchain should provide the appropriate include flags.
778}
779
780void ToolChain::addClangTargetOptions(
781    const ArgList &DriverArgs, ArgStringList &CC1Args,
782    Action::OffloadKind DeviceOffloadKind) const {}
783
784void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
785
786void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
787                                 llvm::opt::ArgStringList &CmdArgs) const {
788  if (!needsProfileRT(Args) && !needsGCovInstrumentation(Args))
789    return;
790
791  CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
792}
793
794ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
795    const ArgList &Args) const {
796  const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
797  StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
798
799  // Only use "platform" in tests to override CLANG_DEFAULT_RTLIB!
800  if (LibName == "compiler-rt")
801    return ToolChain::RLT_CompilerRT;
802  else if (LibName == "libgcc")
803    return ToolChain::RLT_Libgcc;
804  else if (LibName == "platform")
805    return GetDefaultRuntimeLibType();
806
807  if (A)
808    getDriver().Diag(diag::err_drv_invalid_rtlib_name) << A->getAsString(Args);
809
810  return GetDefaultRuntimeLibType();
811}
812
813ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
814    const ArgList &Args) const {
815  const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
816  StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
817
818  if (LibName == "none")
819    return ToolChain::UNW_None;
820  else if (LibName == "platform" || LibName == "") {
821    ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
822    if (RtLibType == ToolChain::RLT_CompilerRT)
823      return ToolChain::UNW_None;
824    else if (RtLibType == ToolChain::RLT_Libgcc)
825      return ToolChain::UNW_Libgcc;
826  } else if (LibName == "libunwind") {
827    if (GetRuntimeLibType(Args) == RLT_Libgcc)
828      getDriver().Diag(diag::err_drv_incompatible_unwindlib);
829    return ToolChain::UNW_CompilerRT;
830  } else if (LibName == "libgcc")
831    return ToolChain::UNW_Libgcc;
832
833  if (A)
834    getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
835        << A->getAsString(Args);
836
837  return GetDefaultUnwindLibType();
838}
839
840ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
841  const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
842  StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
843
844  // Only use "platform" in tests to override CLANG_DEFAULT_CXX_STDLIB!
845  if (LibName == "libc++")
846    return ToolChain::CST_Libcxx;
847  else if (LibName == "libstdc++")
848    return ToolChain::CST_Libstdcxx;
849  else if (LibName == "platform")
850    return GetDefaultCXXStdlibType();
851
852  if (A)
853    getDriver().Diag(diag::err_drv_invalid_stdlib_name) << A->getAsString(Args);
854
855  return GetDefaultCXXStdlibType();
856}
857
858/// Utility function to add a system include directory to CC1 arguments.
859/*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
860                                            ArgStringList &CC1Args,
861                                            const Twine &Path) {
862  CC1Args.push_back("-internal-isystem");
863  CC1Args.push_back(DriverArgs.MakeArgString(Path));
864}
865
866/// Utility function to add a system include directory with extern "C"
867/// semantics to CC1 arguments.
868///
869/// Note that this should be used rarely, and only for directories that
870/// historically and for legacy reasons are treated as having implicit extern
871/// "C" semantics. These semantics are *ignored* by and large today, but its
872/// important to preserve the preprocessor changes resulting from the
873/// classification.
874/*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
875                                                   ArgStringList &CC1Args,
876                                                   const Twine &Path) {
877  CC1Args.push_back("-internal-externc-isystem");
878  CC1Args.push_back(DriverArgs.MakeArgString(Path));
879}
880
881void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
882                                                ArgStringList &CC1Args,
883                                                const Twine &Path) {
884  if (llvm::sys::fs::exists(Path))
885    addExternCSystemInclude(DriverArgs, CC1Args, Path);
886}
887
888/// Utility function to add a list of system include directories to CC1.
889/*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
890                                             ArgStringList &CC1Args,
891                                             ArrayRef<StringRef> Paths) {
892  for (const auto &Path : Paths) {
893    CC1Args.push_back("-internal-isystem");
894    CC1Args.push_back(DriverArgs.MakeArgString(Path));
895  }
896}
897
898void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
899                                             ArgStringList &CC1Args) const {
900  // Header search paths should be handled by each of the subclasses.
901  // Historically, they have not been, and instead have been handled inside of
902  // the CC1-layer frontend. As the logic is hoisted out, this generic function
903  // will slowly stop being called.
904  //
905  // While it is being called, replicate a bit of a hack to propagate the
906  // '-stdlib=' flag down to CC1 so that it can in turn customize the C++
907  // header search paths with it. Once all systems are overriding this
908  // function, the CC1 flag and this line can be removed.
909  DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
910}
911
912void ToolChain::AddClangCXXStdlibIsystemArgs(
913    const llvm::opt::ArgList &DriverArgs,
914    llvm::opt::ArgStringList &CC1Args) const {
915  DriverArgs.ClaimAllArgs(options::OPT_stdlibxx_isystem);
916  if (!DriverArgs.hasArg(options::OPT_nostdincxx))
917    for (const auto &P :
918         DriverArgs.getAllArgValues(options::OPT_stdlibxx_isystem))
919      addSystemInclude(DriverArgs, CC1Args, P);
920}
921
922bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
923  return getDriver().CCCIsCXX() &&
924         !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
925                      options::OPT_nostdlibxx);
926}
927
928void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
929                                    ArgStringList &CmdArgs) const {
930  assert(!Args.hasArg(options::OPT_nostdlibxx) &&
931         "should not have called this");
932  CXXStdlibType Type = GetCXXStdlibType(Args);
933
934  switch (Type) {
935  case ToolChain::CST_Libcxx:
936    CmdArgs.push_back("-lc++");
937    break;
938
939  case ToolChain::CST_Libstdcxx:
940    CmdArgs.push_back("-lstdc++");
941    break;
942  }
943}
944
945void ToolChain::AddFilePathLibArgs(const ArgList &Args,
946                                   ArgStringList &CmdArgs) const {
947  for (const auto &LibPath : getFilePaths())
948    if(LibPath.length() > 0)
949      CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
950}
951
952void ToolChain::AddCCKextLibArgs(const ArgList &Args,
953                                 ArgStringList &CmdArgs) const {
954  CmdArgs.push_back("-lcc_kext");
955}
956
957bool ToolChain::isFastMathRuntimeAvailable(const ArgList &Args,
958                                           std::string &Path) const {
959  // Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
960  // (to keep the linker options consistent with gcc and clang itself).
961  if (!isOptimizationLevelFast(Args)) {
962    // Check if -ffast-math or -funsafe-math.
963    Arg *A =
964      Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
965                      options::OPT_funsafe_math_optimizations,
966                      options::OPT_fno_unsafe_math_optimizations);
967
968    if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
969        A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
970      return false;
971  }
972  // If crtfastmath.o exists add it to the arguments.
973  Path = GetFilePath("crtfastmath.o");
974  return (Path != "crtfastmath.o"); // Not found.
975}
976
977bool ToolChain::addFastMathRuntimeIfAvailable(const ArgList &Args,
978                                              ArgStringList &CmdArgs) const {
979  std::string Path;
980  if (isFastMathRuntimeAvailable(Args, Path)) {
981    CmdArgs.push_back(Args.MakeArgString(Path));
982    return true;
983  }
984
985  return false;
986}
987
988SanitizerMask ToolChain::getSupportedSanitizers() const {
989  // Return sanitizers which don't require runtime support and are not
990  // platform dependent.
991
992  SanitizerMask Res = (SanitizerKind::Undefined & ~SanitizerKind::Vptr &
993                       ~SanitizerKind::Function) |
994                      (SanitizerKind::CFI & ~SanitizerKind::CFIICall) |
995                      SanitizerKind::CFICastStrict |
996                      SanitizerKind::FloatDivideByZero |
997                      SanitizerKind::UnsignedIntegerOverflow |
998                      SanitizerKind::ImplicitConversion |
999                      SanitizerKind::Nullability | SanitizerKind::LocalBounds;
1000  if (getTriple().getArch() == llvm::Triple::x86 ||
1001      getTriple().getArch() == llvm::Triple::x86_64 ||
1002      getTriple().getArch() == llvm::Triple::arm ||
1003      getTriple().getArch() == llvm::Triple::wasm32 ||
1004      getTriple().getArch() == llvm::Triple::wasm64 || getTriple().isAArch64())
1005    Res |= SanitizerKind::CFIICall;
1006  if (getTriple().getArch() == llvm::Triple::x86_64 || getTriple().isAArch64())
1007    Res |= SanitizerKind::ShadowCallStack;
1008  if (getTriple().isAArch64())
1009    Res |= SanitizerKind::MemTag;
1010  return Res;
1011}
1012
1013void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
1014                                   ArgStringList &CC1Args) const {}
1015
1016void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
1017                                  ArgStringList &CC1Args) const {}
1018
1019void ToolChain::AddIAMCUIncludeArgs(const ArgList &DriverArgs,
1020                                    ArgStringList &CC1Args) const {}
1021
1022static 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
1035VersionTuple
1036ToolChain::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
1076llvm::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.
1146void 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 isDriverOption() as an approximation, although things
1167  // like -O4 are going to slip through.
1168  if (!XarchArg || Index > Prev + 1) {
1169    getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1170        << A->getAsString(Args);
1171    return;
1172  } else if (XarchArg->getOption().hasFlag(options::DriverOption)) {
1173    getDriver().Diag(diag::err_drv_invalid_Xarch_argument_isdriver)
1174        << A->getAsString(Args);
1175    return;
1176  }
1177  XarchArg->setBaseArg(A);
1178  A = XarchArg.release();
1179  if (!AllocatedArgs)
1180    DAL->AddSynthesizedArg(A);
1181  else
1182    AllocatedArgs->push_back(A);
1183}
1184
1185llvm::opt::DerivedArgList *ToolChain::TranslateXarchArgs(
1186    const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
1187    Action::OffloadKind OFK,
1188    SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const {
1189  DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1190  bool Modified = false;
1191
1192  bool IsGPU = OFK == Action::OFK_Cuda || OFK == Action::OFK_HIP;
1193  for (Arg *A : Args) {
1194    bool NeedTrans = false;
1195    bool Skip = false;
1196    if (A->getOption().matches(options::OPT_Xarch_device)) {
1197      NeedTrans = IsGPU;
1198      Skip = !IsGPU;
1199    } else if (A->getOption().matches(options::OPT_Xarch_host)) {
1200      NeedTrans = !IsGPU;
1201      Skip = IsGPU;
1202    } else if (A->getOption().matches(options::OPT_Xarch__) && IsGPU) {
1203      // Do not translate -Xarch_ options for non CUDA/HIP toolchain since
1204      // they may need special translation.
1205      // Skip this argument unless the architecture matches BoundArch
1206      if (BoundArch.empty() || A->getValue(0) != BoundArch)
1207        Skip = true;
1208      else
1209        NeedTrans = true;
1210    }
1211    if (NeedTrans || Skip)
1212      Modified = true;
1213    if (NeedTrans)
1214      TranslateXarchArgs(Args, A, DAL, AllocatedArgs);
1215    if (!Skip)
1216      DAL->append(A);
1217  }
1218
1219  if (Modified)
1220    return DAL;
1221
1222  delete DAL;
1223  return nullptr;
1224}
1225