Darwin.cpp revision 317019 
1//===--- Darwin.cpp - Darwin Tool and ToolChain Implementations -*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "Darwin.h"
11#include "Arch/ARM.h"
12#include "CommonArgs.h"
13#include "clang/Basic/ObjCRuntime.h"
14#include "clang/Basic/VirtualFileSystem.h"
15#include "clang/Driver/Compilation.h"
16#include "clang/Driver/Driver.h"
17#include "clang/Driver/DriverDiagnostic.h"
18#include "clang/Driver/Options.h"
19#include "clang/Driver/SanitizerArgs.h"
20#include "llvm/ADT/StringSwitch.h"
21#include "llvm/Option/ArgList.h"
22#include "llvm/Support/Path.h"
23#include "llvm/Support/ScopedPrinter.h"
24#include "llvm/Support/TargetParser.h"
25#include <cstdlib> // ::getenv
26
27using namespace clang::driver;
28using namespace clang::driver::tools;
29using namespace clang::driver::toolchains;
30using namespace clang;
31using namespace llvm::opt;
32
33llvm::Triple::ArchType darwin::getArchTypeForMachOArchName(StringRef Str) {
34  // See arch(3) and llvm-gcc's driver-driver.c. We don't implement support for
35  // archs which Darwin doesn't use.
36
37  // The matching this routine does is fairly pointless, since it is neither the
38  // complete architecture list, nor a reasonable subset. The problem is that
39  // historically the driver driver accepts this and also ties its -march=
40  // handling to the architecture name, so we need to be careful before removing
41  // support for it.
42
43  // This code must be kept in sync with Clang's Darwin specific argument
44  // translation.
45
46  return llvm::StringSwitch<llvm::Triple::ArchType>(Str)
47      .Cases("ppc", "ppc601", "ppc603", "ppc604", "ppc604e", llvm::Triple::ppc)
48      .Cases("ppc750", "ppc7400", "ppc7450", "ppc970", llvm::Triple::ppc)
49      .Case("ppc64", llvm::Triple::ppc64)
50      .Cases("i386", "i486", "i486SX", "i586", "i686", llvm::Triple::x86)
51      .Cases("pentium", "pentpro", "pentIIm3", "pentIIm5", "pentium4",
52             llvm::Triple::x86)
53      .Cases("x86_64", "x86_64h", llvm::Triple::x86_64)
54      // This is derived from the driver driver.
55      .Cases("arm", "armv4t", "armv5", "armv6", "armv6m", llvm::Triple::arm)
56      .Cases("armv7", "armv7em", "armv7k", "armv7m", llvm::Triple::arm)
57      .Cases("armv7s", "xscale", llvm::Triple::arm)
58      .Case("arm64", llvm::Triple::aarch64)
59      .Case("r600", llvm::Triple::r600)
60      .Case("amdgcn", llvm::Triple::amdgcn)
61      .Case("nvptx", llvm::Triple::nvptx)
62      .Case("nvptx64", llvm::Triple::nvptx64)
63      .Case("amdil", llvm::Triple::amdil)
64      .Case("spir", llvm::Triple::spir)
65      .Default(llvm::Triple::UnknownArch);
66}
67
68void darwin::setTripleTypeForMachOArchName(llvm::Triple &T, StringRef Str) {
69  const llvm::Triple::ArchType Arch = getArchTypeForMachOArchName(Str);
70  unsigned ArchKind = llvm::ARM::parseArch(Str);
71  T.setArch(Arch);
72
73  if (Str == "x86_64h")
74    T.setArchName(Str);
75  else if (ArchKind == llvm::ARM::AK_ARMV6M ||
76           ArchKind == llvm::ARM::AK_ARMV7M ||
77           ArchKind == llvm::ARM::AK_ARMV7EM) {
78    T.setOS(llvm::Triple::UnknownOS);
79    T.setObjectFormat(llvm::Triple::MachO);
80  }
81}
82
83void darwin::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
84                                     const InputInfo &Output,
85                                     const InputInfoList &Inputs,
86                                     const ArgList &Args,
87                                     const char *LinkingOutput) const {
88  ArgStringList CmdArgs;
89
90  assert(Inputs.size() == 1 && "Unexpected number of inputs.");
91  const InputInfo &Input = Inputs[0];
92
93  // Determine the original source input.
94  const Action *SourceAction = &JA;
95  while (SourceAction->getKind() != Action::InputClass) {
96    assert(!SourceAction->getInputs().empty() && "unexpected root action!");
97    SourceAction = SourceAction->getInputs()[0];
98  }
99
100  // If -fno-integrated-as is used add -Q to the darwin assember driver to make
101  // sure it runs its system assembler not clang's integrated assembler.
102  // Applicable to darwin11+ and Xcode 4+.  darwin<10 lacked integrated-as.
103  // FIXME: at run-time detect assembler capabilities or rely on version
104  // information forwarded by -target-assembler-version.
105  if (Args.hasArg(options::OPT_fno_integrated_as)) {
106    const llvm::Triple &T(getToolChain().getTriple());
107    if (!(T.isMacOSX() && T.isMacOSXVersionLT(10, 7)))
108      CmdArgs.push_back("-Q");
109  }
110
111  // Forward -g, assuming we are dealing with an actual assembly file.
112  if (SourceAction->getType() == types::TY_Asm ||
113      SourceAction->getType() == types::TY_PP_Asm) {
114    if (Args.hasArg(options::OPT_gstabs))
115      CmdArgs.push_back("--gstabs");
116    else if (Args.hasArg(options::OPT_g_Group))
117      CmdArgs.push_back("-g");
118  }
119
120  // Derived from asm spec.
121  AddMachOArch(Args, CmdArgs);
122
123  // Use -force_cpusubtype_ALL on x86 by default.
124  if (getToolChain().getArch() == llvm::Triple::x86 ||
125      getToolChain().getArch() == llvm::Triple::x86_64 ||
126      Args.hasArg(options::OPT_force__cpusubtype__ALL))
127    CmdArgs.push_back("-force_cpusubtype_ALL");
128
129  if (getToolChain().getArch() != llvm::Triple::x86_64 &&
130      (((Args.hasArg(options::OPT_mkernel) ||
131         Args.hasArg(options::OPT_fapple_kext)) &&
132        getMachOToolChain().isKernelStatic()) ||
133       Args.hasArg(options::OPT_static)))
134    CmdArgs.push_back("-static");
135
136  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
137
138  assert(Output.isFilename() && "Unexpected lipo output.");
139  CmdArgs.push_back("-o");
140  CmdArgs.push_back(Output.getFilename());
141
142  assert(Input.isFilename() && "Invalid input.");
143  CmdArgs.push_back(Input.getFilename());
144
145  // asm_final spec is empty.
146
147  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
148  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
149}
150
151void darwin::MachOTool::anchor() {}
152
153void darwin::MachOTool::AddMachOArch(const ArgList &Args,
154                                     ArgStringList &CmdArgs) const {
155  StringRef ArchName = getMachOToolChain().getMachOArchName(Args);
156
157  // Derived from darwin_arch spec.
158  CmdArgs.push_back("-arch");
159  CmdArgs.push_back(Args.MakeArgString(ArchName));
160
161  // FIXME: Is this needed anymore?
162  if (ArchName == "arm")
163    CmdArgs.push_back("-force_cpusubtype_ALL");
164}
165
166bool darwin::Linker::NeedsTempPath(const InputInfoList &Inputs) const {
167  // We only need to generate a temp path for LTO if we aren't compiling object
168  // files. When compiling source files, we run 'dsymutil' after linking. We
169  // don't run 'dsymutil' when compiling object files.
170  for (const auto &Input : Inputs)
171    if (Input.getType() != types::TY_Object)
172      return true;
173
174  return false;
175}
176
177/// \brief Pass -no_deduplicate to ld64 under certain conditions:
178///
179/// - Either -O0 or -O1 is explicitly specified
180/// - No -O option is specified *and* this is a compile+link (implicit -O0)
181///
182/// Also do *not* add -no_deduplicate when no -O option is specified and this
183/// is just a link (we can't imply -O0)
184static bool shouldLinkerNotDedup(bool IsLinkerOnlyAction, const ArgList &Args) {
185  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
186    if (A->getOption().matches(options::OPT_O0))
187      return true;
188    if (A->getOption().matches(options::OPT_O))
189      return llvm::StringSwitch<bool>(A->getValue())
190                    .Case("1", true)
191                    .Default(false);
192    return false; // OPT_Ofast & OPT_O4
193  }
194
195  if (!IsLinkerOnlyAction) // Implicit -O0 for compile+linker only.
196    return true;
197  return false;
198}
199
200void darwin::Linker::AddLinkArgs(Compilation &C, const ArgList &Args,
201                                 ArgStringList &CmdArgs,
202                                 const InputInfoList &Inputs) const {
203  const Driver &D = getToolChain().getDriver();
204  const toolchains::MachO &MachOTC = getMachOToolChain();
205
206  unsigned Version[5] = {0, 0, 0, 0, 0};
207  if (Arg *A = Args.getLastArg(options::OPT_mlinker_version_EQ)) {
208    if (!Driver::GetReleaseVersion(A->getValue(), Version))
209      D.Diag(diag::err_drv_invalid_version_number) << A->getAsString(Args);
210  }
211
212  // Newer linkers support -demangle. Pass it if supported and not disabled by
213  // the user.
214  if (Version[0] >= 100 && !Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
215    CmdArgs.push_back("-demangle");
216
217  if (Args.hasArg(options::OPT_rdynamic) && Version[0] >= 137)
218    CmdArgs.push_back("-export_dynamic");
219
220  // If we are using App Extension restrictions, pass a flag to the linker
221  // telling it that the compiled code has been audited.
222  if (Args.hasFlag(options::OPT_fapplication_extension,
223                   options::OPT_fno_application_extension, false))
224    CmdArgs.push_back("-application_extension");
225
226  if (D.isUsingLTO()) {
227    // If we are using LTO, then automatically create a temporary file path for
228    // the linker to use, so that it's lifetime will extend past a possible
229    // dsymutil step.
230    if (Version[0] >= 116 && NeedsTempPath(Inputs)) {
231      const char *TmpPath = C.getArgs().MakeArgString(
232          D.GetTemporaryPath("cc", types::getTypeTempSuffix(types::TY_Object)));
233      C.addTempFile(TmpPath);
234      CmdArgs.push_back("-object_path_lto");
235      CmdArgs.push_back(TmpPath);
236    }
237  }
238
239  // Use -lto_library option to specify the libLTO.dylib path. Try to find
240  // it in clang installed libraries. ld64 will only look at this argument
241  // when it actually uses LTO, so libLTO.dylib only needs to exist at link
242  // time if ld64 decides that it needs to use LTO.
243  // Since this is passed unconditionally, ld64 will never look for libLTO.dylib
244  // next to it. That's ok since ld64 using a libLTO.dylib not matching the
245  // clang version won't work anyways.
246  if (Version[0] >= 133) {
247    // Search for libLTO in <InstalledDir>/../lib/libLTO.dylib
248    StringRef P = llvm::sys::path::parent_path(D.Dir);
249    SmallString<128> LibLTOPath(P);
250    llvm::sys::path::append(LibLTOPath, "lib");
251    llvm::sys::path::append(LibLTOPath, "libLTO.dylib");
252    CmdArgs.push_back("-lto_library");
253    CmdArgs.push_back(C.getArgs().MakeArgString(LibLTOPath));
254  }
255
256  // ld64 version 262 and above run the deduplicate pass by default.
257  if (Version[0] >= 262 && shouldLinkerNotDedup(C.getJobs().empty(), Args))
258    CmdArgs.push_back("-no_deduplicate");
259
260  // Derived from the "link" spec.
261  Args.AddAllArgs(CmdArgs, options::OPT_static);
262  if (!Args.hasArg(options::OPT_static))
263    CmdArgs.push_back("-dynamic");
264  if (Args.hasArg(options::OPT_fgnu_runtime)) {
265    // FIXME: gcc replaces -lobjc in forward args with -lobjc-gnu
266    // here. How do we wish to handle such things?
267  }
268
269  if (!Args.hasArg(options::OPT_dynamiclib)) {
270    AddMachOArch(Args, CmdArgs);
271    // FIXME: Why do this only on this path?
272    Args.AddLastArg(CmdArgs, options::OPT_force__cpusubtype__ALL);
273
274    Args.AddLastArg(CmdArgs, options::OPT_bundle);
275    Args.AddAllArgs(CmdArgs, options::OPT_bundle__loader);
276    Args.AddAllArgs(CmdArgs, options::OPT_client__name);
277
278    Arg *A;
279    if ((A = Args.getLastArg(options::OPT_compatibility__version)) ||
280        (A = Args.getLastArg(options::OPT_current__version)) ||
281        (A = Args.getLastArg(options::OPT_install__name)))
282      D.Diag(diag::err_drv_argument_only_allowed_with) << A->getAsString(Args)
283                                                       << "-dynamiclib";
284
285    Args.AddLastArg(CmdArgs, options::OPT_force__flat__namespace);
286    Args.AddLastArg(CmdArgs, options::OPT_keep__private__externs);
287    Args.AddLastArg(CmdArgs, options::OPT_private__bundle);
288  } else {
289    CmdArgs.push_back("-dylib");
290
291    Arg *A;
292    if ((A = Args.getLastArg(options::OPT_bundle)) ||
293        (A = Args.getLastArg(options::OPT_bundle__loader)) ||
294        (A = Args.getLastArg(options::OPT_client__name)) ||
295        (A = Args.getLastArg(options::OPT_force__flat__namespace)) ||
296        (A = Args.getLastArg(options::OPT_keep__private__externs)) ||
297        (A = Args.getLastArg(options::OPT_private__bundle)))
298      D.Diag(diag::err_drv_argument_not_allowed_with) << A->getAsString(Args)
299                                                      << "-dynamiclib";
300
301    Args.AddAllArgsTranslated(CmdArgs, options::OPT_compatibility__version,
302                              "-dylib_compatibility_version");
303    Args.AddAllArgsTranslated(CmdArgs, options::OPT_current__version,
304                              "-dylib_current_version");
305
306    AddMachOArch(Args, CmdArgs);
307
308    Args.AddAllArgsTranslated(CmdArgs, options::OPT_install__name,
309                              "-dylib_install_name");
310  }
311
312  Args.AddLastArg(CmdArgs, options::OPT_all__load);
313  Args.AddAllArgs(CmdArgs, options::OPT_allowable__client);
314  Args.AddLastArg(CmdArgs, options::OPT_bind__at__load);
315  if (MachOTC.isTargetIOSBased())
316    Args.AddLastArg(CmdArgs, options::OPT_arch__errors__fatal);
317  Args.AddLastArg(CmdArgs, options::OPT_dead__strip);
318  Args.AddLastArg(CmdArgs, options::OPT_no__dead__strip__inits__and__terms);
319  Args.AddAllArgs(CmdArgs, options::OPT_dylib__file);
320  Args.AddLastArg(CmdArgs, options::OPT_dynamic);
321  Args.AddAllArgs(CmdArgs, options::OPT_exported__symbols__list);
322  Args.AddLastArg(CmdArgs, options::OPT_flat__namespace);
323  Args.AddAllArgs(CmdArgs, options::OPT_force__load);
324  Args.AddAllArgs(CmdArgs, options::OPT_headerpad__max__install__names);
325  Args.AddAllArgs(CmdArgs, options::OPT_image__base);
326  Args.AddAllArgs(CmdArgs, options::OPT_init);
327
328  // Add the deployment target.
329  MachOTC.addMinVersionArgs(Args, CmdArgs);
330
331  Args.AddLastArg(CmdArgs, options::OPT_nomultidefs);
332  Args.AddLastArg(CmdArgs, options::OPT_multi__module);
333  Args.AddLastArg(CmdArgs, options::OPT_single__module);
334  Args.AddAllArgs(CmdArgs, options::OPT_multiply__defined);
335  Args.AddAllArgs(CmdArgs, options::OPT_multiply__defined__unused);
336
337  if (const Arg *A =
338          Args.getLastArg(options::OPT_fpie, options::OPT_fPIE,
339                          options::OPT_fno_pie, options::OPT_fno_PIE)) {
340    if (A->getOption().matches(options::OPT_fpie) ||
341        A->getOption().matches(options::OPT_fPIE))
342      CmdArgs.push_back("-pie");
343    else
344      CmdArgs.push_back("-no_pie");
345  }
346
347  // for embed-bitcode, use -bitcode_bundle in linker command
348  if (C.getDriver().embedBitcodeEnabled()) {
349    // Check if the toolchain supports bitcode build flow.
350    if (MachOTC.SupportsEmbeddedBitcode()) {
351      CmdArgs.push_back("-bitcode_bundle");
352      if (C.getDriver().embedBitcodeMarkerOnly() && Version[0] >= 278) {
353        CmdArgs.push_back("-bitcode_process_mode");
354        CmdArgs.push_back("marker");
355      }
356    } else
357      D.Diag(diag::err_drv_bitcode_unsupported_on_toolchain);
358  }
359
360  Args.AddLastArg(CmdArgs, options::OPT_prebind);
361  Args.AddLastArg(CmdArgs, options::OPT_noprebind);
362  Args.AddLastArg(CmdArgs, options::OPT_nofixprebinding);
363  Args.AddLastArg(CmdArgs, options::OPT_prebind__all__twolevel__modules);
364  Args.AddLastArg(CmdArgs, options::OPT_read__only__relocs);
365  Args.AddAllArgs(CmdArgs, options::OPT_sectcreate);
366  Args.AddAllArgs(CmdArgs, options::OPT_sectorder);
367  Args.AddAllArgs(CmdArgs, options::OPT_seg1addr);
368  Args.AddAllArgs(CmdArgs, options::OPT_segprot);
369  Args.AddAllArgs(CmdArgs, options::OPT_segaddr);
370  Args.AddAllArgs(CmdArgs, options::OPT_segs__read__only__addr);
371  Args.AddAllArgs(CmdArgs, options::OPT_segs__read__write__addr);
372  Args.AddAllArgs(CmdArgs, options::OPT_seg__addr__table);
373  Args.AddAllArgs(CmdArgs, options::OPT_seg__addr__table__filename);
374  Args.AddAllArgs(CmdArgs, options::OPT_sub__library);
375  Args.AddAllArgs(CmdArgs, options::OPT_sub__umbrella);
376
377  // Give --sysroot= preference, over the Apple specific behavior to also use
378  // --isysroot as the syslibroot.
379  StringRef sysroot = C.getSysRoot();
380  if (sysroot != "") {
381    CmdArgs.push_back("-syslibroot");
382    CmdArgs.push_back(C.getArgs().MakeArgString(sysroot));
383  } else if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
384    CmdArgs.push_back("-syslibroot");
385    CmdArgs.push_back(A->getValue());
386  }
387
388  Args.AddLastArg(CmdArgs, options::OPT_twolevel__namespace);
389  Args.AddLastArg(CmdArgs, options::OPT_twolevel__namespace__hints);
390  Args.AddAllArgs(CmdArgs, options::OPT_umbrella);
391  Args.AddAllArgs(CmdArgs, options::OPT_undefined);
392  Args.AddAllArgs(CmdArgs, options::OPT_unexported__symbols__list);
393  Args.AddAllArgs(CmdArgs, options::OPT_weak__reference__mismatches);
394  Args.AddLastArg(CmdArgs, options::OPT_X_Flag);
395  Args.AddAllArgs(CmdArgs, options::OPT_y);
396  Args.AddLastArg(CmdArgs, options::OPT_w);
397  Args.AddAllArgs(CmdArgs, options::OPT_pagezero__size);
398  Args.AddAllArgs(CmdArgs, options::OPT_segs__read__);
399  Args.AddLastArg(CmdArgs, options::OPT_seglinkedit);
400  Args.AddLastArg(CmdArgs, options::OPT_noseglinkedit);
401  Args.AddAllArgs(CmdArgs, options::OPT_sectalign);
402  Args.AddAllArgs(CmdArgs, options::OPT_sectobjectsymbols);
403  Args.AddAllArgs(CmdArgs, options::OPT_segcreate);
404  Args.AddLastArg(CmdArgs, options::OPT_whyload);
405  Args.AddLastArg(CmdArgs, options::OPT_whatsloaded);
406  Args.AddAllArgs(CmdArgs, options::OPT_dylinker__install__name);
407  Args.AddLastArg(CmdArgs, options::OPT_dylinker);
408  Args.AddLastArg(CmdArgs, options::OPT_Mach);
409}
410
411/// \brief Determine whether we are linking the ObjC runtime.
412static bool isObjCRuntimeLinked(const ArgList &Args) {
413  if (isObjCAutoRefCount(Args)) {
414    Args.ClaimAllArgs(options::OPT_fobjc_link_runtime);
415    return true;
416  }
417  return Args.hasArg(options::OPT_fobjc_link_runtime);
418}
419
420void darwin::Linker::ConstructJob(Compilation &C, const JobAction &JA,
421                                  const InputInfo &Output,
422                                  const InputInfoList &Inputs,
423                                  const ArgList &Args,
424                                  const char *LinkingOutput) const {
425  assert(Output.getType() == types::TY_Image && "Invalid linker output type.");
426
427  // If the number of arguments surpasses the system limits, we will encode the
428  // input files in a separate file, shortening the command line. To this end,
429  // build a list of input file names that can be passed via a file with the
430  // -filelist linker option.
431  llvm::opt::ArgStringList InputFileList;
432
433  // The logic here is derived from gcc's behavior; most of which
434  // comes from specs (starting with link_command). Consult gcc for
435  // more information.
436  ArgStringList CmdArgs;
437
438  /// Hack(tm) to ignore linking errors when we are doing ARC migration.
439  if (Args.hasArg(options::OPT_ccc_arcmt_check,
440                  options::OPT_ccc_arcmt_migrate)) {
441    for (const auto &Arg : Args)
442      Arg->claim();
443    const char *Exec =
444        Args.MakeArgString(getToolChain().GetProgramPath("touch"));
445    CmdArgs.push_back(Output.getFilename());
446    C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, None));
447    return;
448  }
449
450  // I'm not sure why this particular decomposition exists in gcc, but
451  // we follow suite for ease of comparison.
452  AddLinkArgs(C, Args, CmdArgs, Inputs);
453
454  // For LTO, pass the name of the optimization record file.
455  if (Args.hasFlag(options::OPT_fsave_optimization_record,
456                   options::OPT_fno_save_optimization_record, false)) {
457    CmdArgs.push_back("-mllvm");
458    CmdArgs.push_back("-lto-pass-remarks-output");
459    CmdArgs.push_back("-mllvm");
460
461    SmallString<128> F;
462    F = Output.getFilename();
463    F += ".opt.yaml";
464    CmdArgs.push_back(Args.MakeArgString(F));
465
466    if (getLastProfileUseArg(Args)) {
467      CmdArgs.push_back("-mllvm");
468      CmdArgs.push_back("-lto-pass-remarks-with-hotness");
469    }
470  }
471
472  // It seems that the 'e' option is completely ignored for dynamic executables
473  // (the default), and with static executables, the last one wins, as expected.
474  Args.AddAllArgs(CmdArgs, {options::OPT_d_Flag, options::OPT_s, options::OPT_t,
475                            options::OPT_Z_Flag, options::OPT_u_Group,
476                            options::OPT_e, options::OPT_r});
477
478  // Forward -ObjC when either -ObjC or -ObjC++ is used, to force loading
479  // members of static archive libraries which implement Objective-C classes or
480  // categories.
481  if (Args.hasArg(options::OPT_ObjC) || Args.hasArg(options::OPT_ObjCXX))
482    CmdArgs.push_back("-ObjC");
483
484  CmdArgs.push_back("-o");
485  CmdArgs.push_back(Output.getFilename());
486
487  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
488    getMachOToolChain().addStartObjectFileArgs(Args, CmdArgs);
489
490  // SafeStack requires its own runtime libraries
491  // These libraries should be linked first, to make sure the
492  // __safestack_init constructor executes before everything else
493  if (getToolChain().getSanitizerArgs().needsSafeStackRt()) {
494    getMachOToolChain().AddLinkRuntimeLib(Args, CmdArgs,
495                                          "libclang_rt.safestack_osx.a",
496                                          /*AlwaysLink=*/true);
497  }
498
499  Args.AddAllArgs(CmdArgs, options::OPT_L);
500
501  AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
502  // Build the input file for -filelist (list of linker input files) in case we
503  // need it later
504  for (const auto &II : Inputs) {
505    if (!II.isFilename()) {
506      // This is a linker input argument.
507      // We cannot mix input arguments and file names in a -filelist input, thus
508      // we prematurely stop our list (remaining files shall be passed as
509      // arguments).
510      if (InputFileList.size() > 0)
511        break;
512
513      continue;
514    }
515
516    InputFileList.push_back(II.getFilename());
517  }
518
519  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs))
520    addOpenMPRuntime(CmdArgs, getToolChain(), Args);
521
522  if (isObjCRuntimeLinked(Args) &&
523      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
524    // We use arclite library for both ARC and subscripting support.
525    getMachOToolChain().AddLinkARCArgs(Args, CmdArgs);
526
527    CmdArgs.push_back("-framework");
528    CmdArgs.push_back("Foundation");
529    // Link libobj.
530    CmdArgs.push_back("-lobjc");
531  }
532
533  if (LinkingOutput) {
534    CmdArgs.push_back("-arch_multiple");
535    CmdArgs.push_back("-final_output");
536    CmdArgs.push_back(LinkingOutput);
537  }
538
539  if (Args.hasArg(options::OPT_fnested_functions))
540    CmdArgs.push_back("-allow_stack_execute");
541
542  getMachOToolChain().addProfileRTLibs(Args, CmdArgs);
543
544  if (unsigned Parallelism =
545          getLTOParallelism(Args, getToolChain().getDriver())) {
546    CmdArgs.push_back("-mllvm");
547    CmdArgs.push_back(
548        Args.MakeArgString(Twine("-threads=") + llvm::to_string(Parallelism)));
549  }
550
551  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
552    if (getToolChain().getDriver().CCCIsCXX())
553      getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
554
555    // link_ssp spec is empty.
556
557    // Let the tool chain choose which runtime library to link.
558    getMachOToolChain().AddLinkRuntimeLibArgs(Args, CmdArgs);
559
560    // No need to do anything for pthreads. Claim argument to avoid warning.
561    Args.ClaimAllArgs(options::OPT_pthread);
562    Args.ClaimAllArgs(options::OPT_pthreads);
563  }
564
565  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
566    // endfile_spec is empty.
567  }
568
569  Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
570  Args.AddAllArgs(CmdArgs, options::OPT_F);
571
572  // -iframework should be forwarded as -F.
573  for (const Arg *A : Args.filtered(options::OPT_iframework))
574    CmdArgs.push_back(Args.MakeArgString(std::string("-F") + A->getValue()));
575
576  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
577    if (Arg *A = Args.getLastArg(options::OPT_fveclib)) {
578      if (A->getValue() == StringRef("Accelerate")) {
579        CmdArgs.push_back("-framework");
580        CmdArgs.push_back("Accelerate");
581      }
582    }
583  }
584
585  const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
586  std::unique_ptr<Command> Cmd =
587      llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs);
588  Cmd->setInputFileList(std::move(InputFileList));
589  C.addCommand(std::move(Cmd));
590}
591
592void darwin::Lipo::ConstructJob(Compilation &C, const JobAction &JA,
593                                const InputInfo &Output,
594                                const InputInfoList &Inputs,
595                                const ArgList &Args,
596                                const char *LinkingOutput) const {
597  ArgStringList CmdArgs;
598
599  CmdArgs.push_back("-create");
600  assert(Output.isFilename() && "Unexpected lipo output.");
601
602  CmdArgs.push_back("-output");
603  CmdArgs.push_back(Output.getFilename());
604
605  for (const auto &II : Inputs) {
606    assert(II.isFilename() && "Unexpected lipo input.");
607    CmdArgs.push_back(II.getFilename());
608  }
609
610  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("lipo"));
611  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
612}
613
614void darwin::Dsymutil::ConstructJob(Compilation &C, const JobAction &JA,
615                                    const InputInfo &Output,
616                                    const InputInfoList &Inputs,
617                                    const ArgList &Args,
618                                    const char *LinkingOutput) const {
619  ArgStringList CmdArgs;
620
621  CmdArgs.push_back("-o");
622  CmdArgs.push_back(Output.getFilename());
623
624  assert(Inputs.size() == 1 && "Unable to handle multiple inputs.");
625  const InputInfo &Input = Inputs[0];
626  assert(Input.isFilename() && "Unexpected dsymutil input.");
627  CmdArgs.push_back(Input.getFilename());
628
629  const char *Exec =
630      Args.MakeArgString(getToolChain().GetProgramPath("dsymutil"));
631  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
632}
633
634void darwin::VerifyDebug::ConstructJob(Compilation &C, const JobAction &JA,
635                                       const InputInfo &Output,
636                                       const InputInfoList &Inputs,
637                                       const ArgList &Args,
638                                       const char *LinkingOutput) const {
639  ArgStringList CmdArgs;
640  CmdArgs.push_back("--verify");
641  CmdArgs.push_back("--debug-info");
642  CmdArgs.push_back("--eh-frame");
643  CmdArgs.push_back("--quiet");
644
645  assert(Inputs.size() == 1 && "Unable to handle multiple inputs.");
646  const InputInfo &Input = Inputs[0];
647  assert(Input.isFilename() && "Unexpected verify input");
648
649  // Grabbing the output of the earlier dsymutil run.
650  CmdArgs.push_back(Input.getFilename());
651
652  const char *Exec =
653      Args.MakeArgString(getToolChain().GetProgramPath("dwarfdump"));
654  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
655}
656
657MachO::MachO(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
658    : ToolChain(D, Triple, Args) {
659  // We expect 'as', 'ld', etc. to be adjacent to our install dir.
660  getProgramPaths().push_back(getDriver().getInstalledDir());
661  if (getDriver().getInstalledDir() != getDriver().Dir)
662    getProgramPaths().push_back(getDriver().Dir);
663}
664
665/// Darwin - Darwin tool chain for i386 and x86_64.
666Darwin::Darwin(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
667    : MachO(D, Triple, Args), TargetInitialized(false),
668      CudaInstallation(D, Triple, Args) {}
669
670types::ID MachO::LookupTypeForExtension(StringRef Ext) const {
671  types::ID Ty = types::lookupTypeForExtension(Ext);
672
673  // Darwin always preprocesses assembly files (unless -x is used explicitly).
674  if (Ty == types::TY_PP_Asm)
675    return types::TY_Asm;
676
677  return Ty;
678}
679
680bool MachO::HasNativeLLVMSupport() const { return true; }
681
682ToolChain::CXXStdlibType Darwin::GetDefaultCXXStdlibType() const {
683  // Default to use libc++ on OS X 10.9+ and iOS 7+.
684  if ((isTargetMacOS() && !isMacosxVersionLT(10, 9)) ||
685       (isTargetIOSBased() && !isIPhoneOSVersionLT(7, 0)) ||
686       isTargetWatchOSBased())
687    return ToolChain::CST_Libcxx;
688
689  return ToolChain::CST_Libstdcxx;
690}
691
692/// Darwin provides an ARC runtime starting in MacOS X 10.7 and iOS 5.0.
693ObjCRuntime Darwin::getDefaultObjCRuntime(bool isNonFragile) const {
694  if (isTargetWatchOSBased())
695    return ObjCRuntime(ObjCRuntime::WatchOS, TargetVersion);
696  if (isTargetIOSBased())
697    return ObjCRuntime(ObjCRuntime::iOS, TargetVersion);
698  if (isNonFragile)
699    return ObjCRuntime(ObjCRuntime::MacOSX, TargetVersion);
700  return ObjCRuntime(ObjCRuntime::FragileMacOSX, TargetVersion);
701}
702
703/// Darwin provides a blocks runtime starting in MacOS X 10.6 and iOS 3.2.
704bool Darwin::hasBlocksRuntime() const {
705  if (isTargetWatchOSBased())
706    return true;
707  else if (isTargetIOSBased())
708    return !isIPhoneOSVersionLT(3, 2);
709  else {
710    assert(isTargetMacOS() && "unexpected darwin target");
711    return !isMacosxVersionLT(10, 6);
712  }
713}
714
715void Darwin::AddCudaIncludeArgs(const ArgList &DriverArgs,
716                                ArgStringList &CC1Args) const {
717  CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
718}
719
720// This is just a MachO name translation routine and there's no
721// way to join this into ARMTargetParser without breaking all
722// other assumptions. Maybe MachO should consider standardising
723// their nomenclature.
724static const char *ArmMachOArchName(StringRef Arch) {
725  return llvm::StringSwitch<const char *>(Arch)
726      .Case("armv6k", "armv6")
727      .Case("armv6m", "armv6m")
728      .Case("armv5tej", "armv5")
729      .Case("xscale", "xscale")
730      .Case("armv4t", "armv4t")
731      .Case("armv7", "armv7")
732      .Cases("armv7a", "armv7-a", "armv7")
733      .Cases("armv7r", "armv7-r", "armv7")
734      .Cases("armv7em", "armv7e-m", "armv7em")
735      .Cases("armv7k", "armv7-k", "armv7k")
736      .Cases("armv7m", "armv7-m", "armv7m")
737      .Cases("armv7s", "armv7-s", "armv7s")
738      .Default(nullptr);
739}
740
741static const char *ArmMachOArchNameCPU(StringRef CPU) {
742  unsigned ArchKind = llvm::ARM::parseCPUArch(CPU);
743  if (ArchKind == llvm::ARM::AK_INVALID)
744    return nullptr;
745  StringRef Arch = llvm::ARM::getArchName(ArchKind);
746
747  // FIXME: Make sure this MachO triple mangling is really necessary.
748  // ARMv5* normalises to ARMv5.
749  if (Arch.startswith("armv5"))
750    Arch = Arch.substr(0, 5);
751  // ARMv6*, except ARMv6M, normalises to ARMv6.
752  else if (Arch.startswith("armv6") && !Arch.endswith("6m"))
753    Arch = Arch.substr(0, 5);
754  // ARMv7A normalises to ARMv7.
755  else if (Arch.endswith("v7a"))
756    Arch = Arch.substr(0, 5);
757  return Arch.data();
758}
759
760StringRef MachO::getMachOArchName(const ArgList &Args) const {
761  switch (getTriple().getArch()) {
762  default:
763    return getDefaultUniversalArchName();
764
765  case llvm::Triple::aarch64:
766    return "arm64";
767
768  case llvm::Triple::thumb:
769  case llvm::Triple::arm:
770    if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_march_EQ))
771      if (const char *Arch = ArmMachOArchName(A->getValue()))
772        return Arch;
773
774    if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
775      if (const char *Arch = ArmMachOArchNameCPU(A->getValue()))
776        return Arch;
777
778    return "arm";
779  }
780}
781
782Darwin::~Darwin() {}
783
784MachO::~MachO() {}
785
786std::string Darwin::ComputeEffectiveClangTriple(const ArgList &Args,
787                                                types::ID InputType) const {
788  llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
789
790  // If the target isn't initialized (e.g., an unknown Darwin platform, return
791  // the default triple).
792  if (!isTargetInitialized())
793    return Triple.getTriple();
794
795  SmallString<16> Str;
796  if (isTargetWatchOSBased())
797    Str += "watchos";
798  else if (isTargetTvOSBased())
799    Str += "tvos";
800  else if (isTargetIOSBased())
801    Str += "ios";
802  else
803    Str += "macosx";
804  Str += getTargetVersion().getAsString();
805  Triple.setOSName(Str);
806
807  return Triple.getTriple();
808}
809
810Tool *MachO::getTool(Action::ActionClass AC) const {
811  switch (AC) {
812  case Action::LipoJobClass:
813    if (!Lipo)
814      Lipo.reset(new tools::darwin::Lipo(*this));
815    return Lipo.get();
816  case Action::DsymutilJobClass:
817    if (!Dsymutil)
818      Dsymutil.reset(new tools::darwin::Dsymutil(*this));
819    return Dsymutil.get();
820  case Action::VerifyDebugInfoJobClass:
821    if (!VerifyDebug)
822      VerifyDebug.reset(new tools::darwin::VerifyDebug(*this));
823    return VerifyDebug.get();
824  default:
825    return ToolChain::getTool(AC);
826  }
827}
828
829Tool *MachO::buildLinker() const { return new tools::darwin::Linker(*this); }
830
831Tool *MachO::buildAssembler() const {
832  return new tools::darwin::Assembler(*this);
833}
834
835DarwinClang::DarwinClang(const Driver &D, const llvm::Triple &Triple,
836                         const ArgList &Args)
837    : Darwin(D, Triple, Args) {}
838
839void DarwinClang::addClangWarningOptions(ArgStringList &CC1Args) const {
840  // For modern targets, promote certain warnings to errors.
841  if (isTargetWatchOSBased() || getTriple().isArch64Bit()) {
842    // Always enable -Wdeprecated-objc-isa-usage and promote it
843    // to an error.
844    CC1Args.push_back("-Wdeprecated-objc-isa-usage");
845    CC1Args.push_back("-Werror=deprecated-objc-isa-usage");
846
847    // For iOS and watchOS, also error about implicit function declarations,
848    // as that can impact calling conventions.
849    if (!isTargetMacOS())
850      CC1Args.push_back("-Werror=implicit-function-declaration");
851  }
852}
853
854void DarwinClang::AddLinkARCArgs(const ArgList &Args,
855                                 ArgStringList &CmdArgs) const {
856  // Avoid linking compatibility stubs on i386 mac.
857  if (isTargetMacOS() && getArch() == llvm::Triple::x86)
858    return;
859
860  ObjCRuntime runtime = getDefaultObjCRuntime(/*nonfragile*/ true);
861
862  if ((runtime.hasNativeARC() || !isObjCAutoRefCount(Args)) &&
863      runtime.hasSubscripting())
864    return;
865
866  CmdArgs.push_back("-force_load");
867  SmallString<128> P(getDriver().ClangExecutable);
868  llvm::sys::path::remove_filename(P); // 'clang'
869  llvm::sys::path::remove_filename(P); // 'bin'
870  llvm::sys::path::append(P, "lib", "arc", "libarclite_");
871  // Mash in the platform.
872  if (isTargetWatchOSSimulator())
873    P += "watchsimulator";
874  else if (isTargetWatchOS())
875    P += "watchos";
876  else if (isTargetTvOSSimulator())
877    P += "appletvsimulator";
878  else if (isTargetTvOS())
879    P += "appletvos";
880  else if (isTargetIOSSimulator())
881    P += "iphonesimulator";
882  else if (isTargetIPhoneOS())
883    P += "iphoneos";
884  else
885    P += "macosx";
886  P += ".a";
887
888  CmdArgs.push_back(Args.MakeArgString(P));
889}
890
891unsigned DarwinClang::GetDefaultDwarfVersion() const {
892  // Default to use DWARF 2 on OS X 10.10 / iOS 8 and lower.
893  if ((isTargetMacOS() && isMacosxVersionLT(10, 11)) ||
894      (isTargetIOSBased() && isIPhoneOSVersionLT(9)))
895    return 2;
896  return 4;
897}
898
899void MachO::AddLinkRuntimeLib(const ArgList &Args, ArgStringList &CmdArgs,
900                              StringRef DarwinLibName, bool AlwaysLink,
901                              bool IsEmbedded, bool AddRPath) const {
902  SmallString<128> Dir(getDriver().ResourceDir);
903  llvm::sys::path::append(Dir, "lib", IsEmbedded ? "macho_embedded" : "darwin");
904
905  SmallString<128> P(Dir);
906  llvm::sys::path::append(P, DarwinLibName);
907
908  // For now, allow missing resource libraries to support developers who may
909  // not have compiler-rt checked out or integrated into their build (unless
910  // we explicitly force linking with this library).
911  if (AlwaysLink || getVFS().exists(P))
912    CmdArgs.push_back(Args.MakeArgString(P));
913
914  // Adding the rpaths might negatively interact when other rpaths are involved,
915  // so we should make sure we add the rpaths last, after all user-specified
916  // rpaths. This is currently true from this place, but we need to be
917  // careful if this function is ever called before user's rpaths are emitted.
918  if (AddRPath) {
919    assert(DarwinLibName.endswith(".dylib") && "must be a dynamic library");
920
921    // Add @executable_path to rpath to support having the dylib copied with
922    // the executable.
923    CmdArgs.push_back("-rpath");
924    CmdArgs.push_back("@executable_path");
925
926    // Add the path to the resource dir to rpath to support using the dylib
927    // from the default location without copying.
928    CmdArgs.push_back("-rpath");
929    CmdArgs.push_back(Args.MakeArgString(Dir));
930  }
931}
932
933StringRef Darwin::getPlatformFamily() const {
934  switch (TargetPlatform) {
935    case DarwinPlatformKind::MacOS:
936      return "MacOSX";
937    case DarwinPlatformKind::IPhoneOS:
938    case DarwinPlatformKind::IPhoneOSSimulator:
939      return "iPhone";
940    case DarwinPlatformKind::TvOS:
941    case DarwinPlatformKind::TvOSSimulator:
942      return "AppleTV";
943    case DarwinPlatformKind::WatchOS:
944    case DarwinPlatformKind::WatchOSSimulator:
945      return "Watch";
946  }
947  llvm_unreachable("Unsupported platform");
948}
949
950StringRef Darwin::getSDKName(StringRef isysroot) {
951  // Assume SDK has path: SOME_PATH/SDKs/PlatformXX.YY.sdk
952  llvm::sys::path::const_iterator SDKDir;
953  auto BeginSDK = llvm::sys::path::begin(isysroot);
954  auto EndSDK = llvm::sys::path::end(isysroot);
955  for (auto IT = BeginSDK; IT != EndSDK; ++IT) {
956    StringRef SDK = *IT;
957    if (SDK.endswith(".sdk"))
958      return SDK.slice(0, SDK.size() - 4);
959  }
960  return "";
961}
962
963StringRef Darwin::getOSLibraryNameSuffix() const {
964  switch(TargetPlatform) {
965  case DarwinPlatformKind::MacOS:
966    return "osx";
967  case DarwinPlatformKind::IPhoneOS:
968    return "ios";
969  case DarwinPlatformKind::IPhoneOSSimulator:
970    return "iossim";
971  case DarwinPlatformKind::TvOS:
972    return "tvos";
973  case DarwinPlatformKind::TvOSSimulator:
974    return "tvossim";
975  case DarwinPlatformKind::WatchOS:
976    return "watchos";
977  case DarwinPlatformKind::WatchOSSimulator:
978    return "watchossim";
979  }
980  llvm_unreachable("Unsupported platform");
981}
982
983void Darwin::addProfileRTLibs(const ArgList &Args,
984                              ArgStringList &CmdArgs) const {
985  if (!needsProfileRT(Args)) return;
986
987  AddLinkRuntimeLib(Args, CmdArgs, (Twine("libclang_rt.profile_") +
988       getOSLibraryNameSuffix() + ".a").str(),
989                    /*AlwaysLink*/ true);
990}
991
992void DarwinClang::AddLinkSanitizerLibArgs(const ArgList &Args,
993                                          ArgStringList &CmdArgs,
994                                          StringRef Sanitizer) const {
995  AddLinkRuntimeLib(
996      Args, CmdArgs,
997      (Twine("libclang_rt.") + Sanitizer + "_" +
998       getOSLibraryNameSuffix() + "_dynamic.dylib").str(),
999      /*AlwaysLink*/ true, /*IsEmbedded*/ false,
1000      /*AddRPath*/ true);
1001}
1002
1003ToolChain::RuntimeLibType DarwinClang::GetRuntimeLibType(
1004    const ArgList &Args) const {
1005  if (Arg* A = Args.getLastArg(options::OPT_rtlib_EQ)) {
1006    StringRef Value = A->getValue();
1007    if (Value != "compiler-rt")
1008      getDriver().Diag(clang::diag::err_drv_unsupported_rtlib_for_platform)
1009          << Value << "darwin";
1010  }
1011
1012  return ToolChain::RLT_CompilerRT;
1013}
1014
1015void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
1016                                        ArgStringList &CmdArgs) const {
1017  // Call once to ensure diagnostic is printed if wrong value was specified
1018  GetRuntimeLibType(Args);
1019
1020  // Darwin doesn't support real static executables, don't link any runtime
1021  // libraries with -static.
1022  if (Args.hasArg(options::OPT_static) ||
1023      Args.hasArg(options::OPT_fapple_kext) ||
1024      Args.hasArg(options::OPT_mkernel))
1025    return;
1026
1027  // Reject -static-libgcc for now, we can deal with this when and if someone
1028  // cares. This is useful in situations where someone wants to statically link
1029  // something like libstdc++, and needs its runtime support routines.
1030  if (const Arg *A = Args.getLastArg(options::OPT_static_libgcc)) {
1031    getDriver().Diag(diag::err_drv_unsupported_opt) << A->getAsString(Args);
1032    return;
1033  }
1034
1035  const SanitizerArgs &Sanitize = getSanitizerArgs();
1036  if (Sanitize.needsAsanRt())
1037    AddLinkSanitizerLibArgs(Args, CmdArgs, "asan");
1038  if (Sanitize.needsUbsanRt())
1039    AddLinkSanitizerLibArgs(Args, CmdArgs, "ubsan");
1040  if (Sanitize.needsTsanRt())
1041    AddLinkSanitizerLibArgs(Args, CmdArgs, "tsan");
1042  if (Sanitize.needsStatsRt()) {
1043    StringRef OS = isTargetMacOS() ? "osx" : "iossim";
1044    AddLinkRuntimeLib(Args, CmdArgs,
1045                      (Twine("libclang_rt.stats_client_") + OS + ".a").str(),
1046                      /*AlwaysLink=*/true);
1047    AddLinkSanitizerLibArgs(Args, CmdArgs, "stats");
1048  }
1049  if (Sanitize.needsEsanRt())
1050    AddLinkSanitizerLibArgs(Args, CmdArgs, "esan");
1051
1052  // Otherwise link libSystem, then the dynamic runtime library, and finally any
1053  // target specific static runtime library.
1054  CmdArgs.push_back("-lSystem");
1055
1056  // Select the dynamic runtime library and the target specific static library.
1057  if (isTargetWatchOSBased()) {
1058    // We currently always need a static runtime library for watchOS.
1059    AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.watchos.a");
1060  } else if (isTargetTvOSBased()) {
1061    // We currently always need a static runtime library for tvOS.
1062    AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.tvos.a");
1063  } else if (isTargetIOSBased()) {
1064    // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
1065    // it never went into the SDK.
1066    // Linking against libgcc_s.1 isn't needed for iOS 5.0+
1067    if (isIPhoneOSVersionLT(5, 0) && !isTargetIOSSimulator() &&
1068        getTriple().getArch() != llvm::Triple::aarch64)
1069      CmdArgs.push_back("-lgcc_s.1");
1070
1071    // We currently always need a static runtime library for iOS.
1072    AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.ios.a");
1073  } else {
1074    assert(isTargetMacOS() && "unexpected non MacOS platform");
1075    // The dynamic runtime library was merged with libSystem for 10.6 and
1076    // beyond; only 10.4 and 10.5 need an additional runtime library.
1077    if (isMacosxVersionLT(10, 5))
1078      CmdArgs.push_back("-lgcc_s.10.4");
1079    else if (isMacosxVersionLT(10, 6))
1080      CmdArgs.push_back("-lgcc_s.10.5");
1081
1082    // Originally for OS X, we thought we would only need a static runtime
1083    // library when targeting 10.4, to provide versions of the static functions
1084    // which were omitted from 10.4.dylib. This led to the creation of the 10.4
1085    // builtins library.
1086    //
1087    // Unfortunately, that turned out to not be true, because Darwin system
1088    // headers can still use eprintf on i386, and it is not exported from
1089    // libSystem. Therefore, we still must provide a runtime library just for
1090    // the tiny tiny handful of projects that *might* use that symbol.
1091    //
1092    // Then over time, we figured out it was useful to add more things to the
1093    // runtime so we created libclang_rt.osx.a to provide new functions when
1094    // deploying to old OS builds, and for a long time we had both eprintf and
1095    // osx builtin libraries. Which just seems excessive. So with PR 28855, we
1096    // are removing the eprintf library and expecting eprintf to be provided by
1097    // the OS X builtins library.
1098    if (isMacosxVersionLT(10, 5))
1099      AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.10.4.a");
1100    else
1101      AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.osx.a");
1102  }
1103}
1104
1105void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
1106  const OptTable &Opts = getDriver().getOpts();
1107
1108  // Support allowing the SDKROOT environment variable used by xcrun and other
1109  // Xcode tools to define the default sysroot, by making it the default for
1110  // isysroot.
1111  if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
1112    // Warn if the path does not exist.
1113    if (!getVFS().exists(A->getValue()))
1114      getDriver().Diag(clang::diag::warn_missing_sysroot) << A->getValue();
1115  } else {
1116    if (char *env = ::getenv("SDKROOT")) {
1117      // We only use this value as the default if it is an absolute path,
1118      // exists, and it is not the root path.
1119      if (llvm::sys::path::is_absolute(env) && getVFS().exists(env) &&
1120          StringRef(env) != "/") {
1121        Args.append(Args.MakeSeparateArg(
1122            nullptr, Opts.getOption(options::OPT_isysroot), env));
1123      }
1124    }
1125  }
1126
1127  Arg *OSXVersion = Args.getLastArg(options::OPT_mmacosx_version_min_EQ);
1128  Arg *iOSVersion = Args.getLastArg(options::OPT_miphoneos_version_min_EQ,
1129                                    options::OPT_mios_simulator_version_min_EQ);
1130  Arg *TvOSVersion =
1131      Args.getLastArg(options::OPT_mtvos_version_min_EQ,
1132                      options::OPT_mtvos_simulator_version_min_EQ);
1133  Arg *WatchOSVersion =
1134      Args.getLastArg(options::OPT_mwatchos_version_min_EQ,
1135                      options::OPT_mwatchos_simulator_version_min_EQ);
1136
1137  // Add a macro to differentiate between m(iphone|tv|watch)os-version-min=X.Y and
1138  // -m(iphone|tv|watch)simulator-version-min=X.Y.
1139  if (Args.hasArg(options::OPT_mios_simulator_version_min_EQ) ||
1140      Args.hasArg(options::OPT_mtvos_simulator_version_min_EQ) ||
1141      Args.hasArg(options::OPT_mwatchos_simulator_version_min_EQ))
1142    Args.append(Args.MakeSeparateArg(nullptr, Opts.getOption(options::OPT_D),
1143                                     " __APPLE_EMBEDDED_SIMULATOR__=1"));
1144
1145  if (OSXVersion && (iOSVersion || TvOSVersion || WatchOSVersion)) {
1146    getDriver().Diag(diag::err_drv_argument_not_allowed_with)
1147        << OSXVersion->getAsString(Args)
1148        << (iOSVersion ? iOSVersion :
1149            TvOSVersion ? TvOSVersion : WatchOSVersion)->getAsString(Args);
1150    iOSVersion = TvOSVersion = WatchOSVersion = nullptr;
1151  } else if (iOSVersion && (TvOSVersion || WatchOSVersion)) {
1152    getDriver().Diag(diag::err_drv_argument_not_allowed_with)
1153        << iOSVersion->getAsString(Args)
1154        << (TvOSVersion ? TvOSVersion : WatchOSVersion)->getAsString(Args);
1155    TvOSVersion = WatchOSVersion = nullptr;
1156  } else if (TvOSVersion && WatchOSVersion) {
1157     getDriver().Diag(diag::err_drv_argument_not_allowed_with)
1158        << TvOSVersion->getAsString(Args)
1159        << WatchOSVersion->getAsString(Args);
1160    WatchOSVersion = nullptr;
1161  } else if (!OSXVersion && !iOSVersion && !TvOSVersion && !WatchOSVersion) {
1162    // If no deployment target was specified on the command line, check for
1163    // environment defines.
1164    std::string OSXTarget;
1165    std::string iOSTarget;
1166    std::string TvOSTarget;
1167    std::string WatchOSTarget;
1168
1169    if (char *env = ::getenv("MACOSX_DEPLOYMENT_TARGET"))
1170      OSXTarget = env;
1171    if (char *env = ::getenv("IPHONEOS_DEPLOYMENT_TARGET"))
1172      iOSTarget = env;
1173    if (char *env = ::getenv("TVOS_DEPLOYMENT_TARGET"))
1174      TvOSTarget = env;
1175    if (char *env = ::getenv("WATCHOS_DEPLOYMENT_TARGET"))
1176      WatchOSTarget = env;
1177
1178    // If there is no command-line argument to specify the Target version and
1179    // no environment variable defined, see if we can set the default based
1180    // on -isysroot.
1181    if (OSXTarget.empty() && iOSTarget.empty() && WatchOSTarget.empty() &&
1182        TvOSTarget.empty() && Args.hasArg(options::OPT_isysroot)) {
1183      if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
1184        StringRef isysroot = A->getValue();
1185        StringRef SDK = getSDKName(isysroot);
1186        if (SDK.size() > 0) {
1187          // Slice the version number out.
1188          // Version number is between the first and the last number.
1189          size_t StartVer = SDK.find_first_of("0123456789");
1190          size_t EndVer = SDK.find_last_of("0123456789");
1191          if (StartVer != StringRef::npos && EndVer > StartVer) {
1192            StringRef Version = SDK.slice(StartVer, EndVer + 1);
1193            if (SDK.startswith("iPhoneOS") ||
1194                SDK.startswith("iPhoneSimulator"))
1195              iOSTarget = Version;
1196            else if (SDK.startswith("MacOSX"))
1197              OSXTarget = Version;
1198            else if (SDK.startswith("WatchOS") ||
1199                     SDK.startswith("WatchSimulator"))
1200              WatchOSTarget = Version;
1201            else if (SDK.startswith("AppleTVOS") ||
1202                     SDK.startswith("AppleTVSimulator"))
1203              TvOSTarget = Version;
1204          }
1205        }
1206      }
1207    }
1208
1209    // If no OSX or iOS target has been specified, try to guess platform
1210    // from arch name and compute the version from the triple.
1211    if (OSXTarget.empty() && iOSTarget.empty() && TvOSTarget.empty() &&
1212        WatchOSTarget.empty()) {
1213      StringRef MachOArchName = getMachOArchName(Args);
1214      unsigned Major, Minor, Micro;
1215      if (MachOArchName == "armv7" || MachOArchName == "armv7s" ||
1216          MachOArchName == "arm64") {
1217        getTriple().getiOSVersion(Major, Minor, Micro);
1218        llvm::raw_string_ostream(iOSTarget) << Major << '.' << Minor << '.'
1219                                            << Micro;
1220      } else if (MachOArchName == "armv7k") {
1221        getTriple().getWatchOSVersion(Major, Minor, Micro);
1222        llvm::raw_string_ostream(WatchOSTarget) << Major << '.' << Minor << '.'
1223                                                << Micro;
1224      } else if (MachOArchName != "armv6m" && MachOArchName != "armv7m" &&
1225                 MachOArchName != "armv7em") {
1226        if (!getTriple().getMacOSXVersion(Major, Minor, Micro)) {
1227          getDriver().Diag(diag::err_drv_invalid_darwin_version)
1228              << getTriple().getOSName();
1229        }
1230        llvm::raw_string_ostream(OSXTarget) << Major << '.' << Minor << '.'
1231                                            << Micro;
1232      }
1233    }
1234
1235    // Do not allow conflicts with the watchOS target.
1236    if (!WatchOSTarget.empty() && (!iOSTarget.empty() || !TvOSTarget.empty())) {
1237      getDriver().Diag(diag::err_drv_conflicting_deployment_targets)
1238        << "WATCHOS_DEPLOYMENT_TARGET"
1239        << (!iOSTarget.empty() ? "IPHONEOS_DEPLOYMENT_TARGET" :
1240            "TVOS_DEPLOYMENT_TARGET");
1241    }
1242
1243    // Do not allow conflicts with the tvOS target.
1244    if (!TvOSTarget.empty() && !iOSTarget.empty()) {
1245      getDriver().Diag(diag::err_drv_conflicting_deployment_targets)
1246        << "TVOS_DEPLOYMENT_TARGET"
1247        << "IPHONEOS_DEPLOYMENT_TARGET";
1248    }
1249
1250    // Allow conflicts among OSX and iOS for historical reasons, but choose the
1251    // default platform.
1252    if (!OSXTarget.empty() && (!iOSTarget.empty() ||
1253                               !WatchOSTarget.empty() ||
1254                               !TvOSTarget.empty())) {
1255      if (getTriple().getArch() == llvm::Triple::arm ||
1256          getTriple().getArch() == llvm::Triple::aarch64 ||
1257          getTriple().getArch() == llvm::Triple::thumb)
1258        OSXTarget = "";
1259      else
1260        iOSTarget = WatchOSTarget = TvOSTarget = "";
1261    }
1262
1263    if (!OSXTarget.empty()) {
1264      const Option O = Opts.getOption(options::OPT_mmacosx_version_min_EQ);
1265      OSXVersion = Args.MakeJoinedArg(nullptr, O, OSXTarget);
1266      Args.append(OSXVersion);
1267    } else if (!iOSTarget.empty()) {
1268      const Option O = Opts.getOption(options::OPT_miphoneos_version_min_EQ);
1269      iOSVersion = Args.MakeJoinedArg(nullptr, O, iOSTarget);
1270      Args.append(iOSVersion);
1271    } else if (!TvOSTarget.empty()) {
1272      const Option O = Opts.getOption(options::OPT_mtvos_version_min_EQ);
1273      TvOSVersion = Args.MakeJoinedArg(nullptr, O, TvOSTarget);
1274      Args.append(TvOSVersion);
1275    } else if (!WatchOSTarget.empty()) {
1276      const Option O = Opts.getOption(options::OPT_mwatchos_version_min_EQ);
1277      WatchOSVersion = Args.MakeJoinedArg(nullptr, O, WatchOSTarget);
1278      Args.append(WatchOSVersion);
1279    }
1280  }
1281
1282  DarwinPlatformKind Platform;
1283  if (OSXVersion)
1284    Platform = MacOS;
1285  else if (iOSVersion)
1286    Platform = IPhoneOS;
1287  else if (TvOSVersion)
1288    Platform = TvOS;
1289  else if (WatchOSVersion)
1290    Platform = WatchOS;
1291  else
1292    llvm_unreachable("Unable to infer Darwin variant");
1293
1294  // Set the tool chain target information.
1295  unsigned Major, Minor, Micro;
1296  bool HadExtra;
1297  if (Platform == MacOS) {
1298    assert((!iOSVersion && !TvOSVersion && !WatchOSVersion) &&
1299           "Unknown target platform!");
1300    if (!Driver::GetReleaseVersion(OSXVersion->getValue(), Major, Minor, Micro,
1301                                   HadExtra) ||
1302        HadExtra || Major != 10 || Minor >= 100 || Micro >= 100)
1303      getDriver().Diag(diag::err_drv_invalid_version_number)
1304          << OSXVersion->getAsString(Args);
1305  } else if (Platform == IPhoneOS) {
1306    assert(iOSVersion && "Unknown target platform!");
1307    if (!Driver::GetReleaseVersion(iOSVersion->getValue(), Major, Minor, Micro,
1308                                   HadExtra) ||
1309        HadExtra || Major >= 100 || Minor >= 100 || Micro >= 100)
1310      getDriver().Diag(diag::err_drv_invalid_version_number)
1311          << iOSVersion->getAsString(Args);
1312  } else if (Platform == TvOS) {
1313    if (!Driver::GetReleaseVersion(TvOSVersion->getValue(), Major, Minor,
1314                                   Micro, HadExtra) || HadExtra ||
1315        Major >= 100 || Minor >= 100 || Micro >= 100)
1316      getDriver().Diag(diag::err_drv_invalid_version_number)
1317          << TvOSVersion->getAsString(Args);
1318  } else if (Platform == WatchOS) {
1319    if (!Driver::GetReleaseVersion(WatchOSVersion->getValue(), Major, Minor,
1320                                   Micro, HadExtra) || HadExtra ||
1321        Major >= 10 || Minor >= 100 || Micro >= 100)
1322      getDriver().Diag(diag::err_drv_invalid_version_number)
1323          << WatchOSVersion->getAsString(Args);
1324  } else
1325    llvm_unreachable("unknown kind of Darwin platform");
1326
1327  // Recognize iOS targets with an x86 architecture as the iOS simulator.
1328  if (iOSVersion && (getTriple().getArch() == llvm::Triple::x86 ||
1329                     getTriple().getArch() == llvm::Triple::x86_64))
1330    Platform = IPhoneOSSimulator;
1331  if (TvOSVersion && (getTriple().getArch() == llvm::Triple::x86 ||
1332                      getTriple().getArch() == llvm::Triple::x86_64))
1333    Platform = TvOSSimulator;
1334  if (WatchOSVersion && (getTriple().getArch() == llvm::Triple::x86 ||
1335                         getTriple().getArch() == llvm::Triple::x86_64))
1336    Platform = WatchOSSimulator;
1337
1338  setTarget(Platform, Major, Minor, Micro);
1339
1340  if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
1341    StringRef SDK = getSDKName(A->getValue());
1342    if (SDK.size() > 0) {
1343      size_t StartVer = SDK.find_first_of("0123456789");
1344      StringRef SDKName = SDK.slice(0, StartVer);
1345      if (!SDKName.startswith(getPlatformFamily()))
1346        getDriver().Diag(diag::warn_incompatible_sysroot)
1347            << SDKName << getPlatformFamily();
1348    }
1349  }
1350}
1351
1352void DarwinClang::AddCXXStdlibLibArgs(const ArgList &Args,
1353                                      ArgStringList &CmdArgs) const {
1354  CXXStdlibType Type = GetCXXStdlibType(Args);
1355
1356  switch (Type) {
1357  case ToolChain::CST_Libcxx:
1358    CmdArgs.push_back("-lc++");
1359    break;
1360
1361  case ToolChain::CST_Libstdcxx:
1362    // Unfortunately, -lstdc++ doesn't always exist in the standard search path;
1363    // it was previously found in the gcc lib dir. However, for all the Darwin
1364    // platforms we care about it was -lstdc++.6, so we search for that
1365    // explicitly if we can't see an obvious -lstdc++ candidate.
1366
1367    // Check in the sysroot first.
1368    if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
1369      SmallString<128> P(A->getValue());
1370      llvm::sys::path::append(P, "usr", "lib", "libstdc++.dylib");
1371
1372      if (!getVFS().exists(P)) {
1373        llvm::sys::path::remove_filename(P);
1374        llvm::sys::path::append(P, "libstdc++.6.dylib");
1375        if (getVFS().exists(P)) {
1376          CmdArgs.push_back(Args.MakeArgString(P));
1377          return;
1378        }
1379      }
1380    }
1381
1382    // Otherwise, look in the root.
1383    // FIXME: This should be removed someday when we don't have to care about
1384    // 10.6 and earlier, where /usr/lib/libstdc++.dylib does not exist.
1385    if (!getVFS().exists("/usr/lib/libstdc++.dylib") &&
1386        getVFS().exists("/usr/lib/libstdc++.6.dylib")) {
1387      CmdArgs.push_back("/usr/lib/libstdc++.6.dylib");
1388      return;
1389    }
1390
1391    // Otherwise, let the linker search.
1392    CmdArgs.push_back("-lstdc++");
1393    break;
1394  }
1395}
1396
1397void DarwinClang::AddCCKextLibArgs(const ArgList &Args,
1398                                   ArgStringList &CmdArgs) const {
1399  // For Darwin platforms, use the compiler-rt-based support library
1400  // instead of the gcc-provided one (which is also incidentally
1401  // only present in the gcc lib dir, which makes it hard to find).
1402
1403  SmallString<128> P(getDriver().ResourceDir);
1404  llvm::sys::path::append(P, "lib", "darwin");
1405
1406  // Use the newer cc_kext for iOS ARM after 6.0.
1407  if (isTargetWatchOS()) {
1408    llvm::sys::path::append(P, "libclang_rt.cc_kext_watchos.a");
1409  } else if (isTargetTvOS()) {
1410    llvm::sys::path::append(P, "libclang_rt.cc_kext_tvos.a");
1411  } else if (isTargetIPhoneOS()) {
1412    llvm::sys::path::append(P, "libclang_rt.cc_kext_ios.a");
1413  } else {
1414    llvm::sys::path::append(P, "libclang_rt.cc_kext.a");
1415  }
1416
1417  // For now, allow missing resource libraries to support developers who may
1418  // not have compiler-rt checked out or integrated into their build.
1419  if (getVFS().exists(P))
1420    CmdArgs.push_back(Args.MakeArgString(P));
1421}
1422
1423DerivedArgList *MachO::TranslateArgs(const DerivedArgList &Args,
1424                                     StringRef BoundArch,
1425                                     Action::OffloadKind) const {
1426  DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1427  const OptTable &Opts = getDriver().getOpts();
1428
1429  // FIXME: We really want to get out of the tool chain level argument
1430  // translation business, as it makes the driver functionality much
1431  // more opaque. For now, we follow gcc closely solely for the
1432  // purpose of easily achieving feature parity & testability. Once we
1433  // have something that works, we should reevaluate each translation
1434  // and try to push it down into tool specific logic.
1435
1436  for (Arg *A : Args) {
1437    if (A->getOption().matches(options::OPT_Xarch__)) {
1438      // Skip this argument unless the architecture matches either the toolchain
1439      // triple arch, or the arch being bound.
1440      llvm::Triple::ArchType XarchArch =
1441          tools::darwin::getArchTypeForMachOArchName(A->getValue(0));
1442      if (!(XarchArch == getArch() ||
1443            (!BoundArch.empty() &&
1444             XarchArch ==
1445                 tools::darwin::getArchTypeForMachOArchName(BoundArch))))
1446        continue;
1447
1448      Arg *OriginalArg = A;
1449      unsigned Index = Args.getBaseArgs().MakeIndex(A->getValue(1));
1450      unsigned Prev = Index;
1451      std::unique_ptr<Arg> XarchArg(Opts.ParseOneArg(Args, Index));
1452
1453      // If the argument parsing failed or more than one argument was
1454      // consumed, the -Xarch_ argument's parameter tried to consume
1455      // extra arguments. Emit an error and ignore.
1456      //
1457      // We also want to disallow any options which would alter the
1458      // driver behavior; that isn't going to work in our model. We
1459      // use isDriverOption() as an approximation, although things
1460      // like -O4 are going to slip through.
1461      if (!XarchArg || Index > Prev + 1) {
1462        getDriver().Diag(diag::err_drv_invalid_Xarch_argument_with_args)
1463            << A->getAsString(Args);
1464        continue;
1465      } else if (XarchArg->getOption().hasFlag(options::DriverOption)) {
1466        getDriver().Diag(diag::err_drv_invalid_Xarch_argument_isdriver)
1467            << A->getAsString(Args);
1468        continue;
1469      }
1470
1471      XarchArg->setBaseArg(A);
1472
1473      A = XarchArg.release();
1474      DAL->AddSynthesizedArg(A);
1475
1476      // Linker input arguments require custom handling. The problem is that we
1477      // have already constructed the phase actions, so we can not treat them as
1478      // "input arguments".
1479      if (A->getOption().hasFlag(options::LinkerInput)) {
1480        // Convert the argument into individual Zlinker_input_args.
1481        for (const char *Value : A->getValues()) {
1482          DAL->AddSeparateArg(
1483              OriginalArg, Opts.getOption(options::OPT_Zlinker_input), Value);
1484        }
1485        continue;
1486      }
1487    }
1488
1489    // Sob. These is strictly gcc compatible for the time being. Apple
1490    // gcc translates options twice, which means that self-expanding
1491    // options add duplicates.
1492    switch ((options::ID)A->getOption().getID()) {
1493    default:
1494      DAL->append(A);
1495      break;
1496
1497    case options::OPT_mkernel:
1498    case options::OPT_fapple_kext:
1499      DAL->append(A);
1500      DAL->AddFlagArg(A, Opts.getOption(options::OPT_static));
1501      break;
1502
1503    case options::OPT_dependency_file:
1504      DAL->AddSeparateArg(A, Opts.getOption(options::OPT_MF), A->getValue());
1505      break;
1506
1507    case options::OPT_gfull:
1508      DAL->AddFlagArg(A, Opts.getOption(options::OPT_g_Flag));
1509      DAL->AddFlagArg(
1510          A, Opts.getOption(options::OPT_fno_eliminate_unused_debug_symbols));
1511      break;
1512
1513    case options::OPT_gused:
1514      DAL->AddFlagArg(A, Opts.getOption(options::OPT_g_Flag));
1515      DAL->AddFlagArg(
1516          A, Opts.getOption(options::OPT_feliminate_unused_debug_symbols));
1517      break;
1518
1519    case options::OPT_shared:
1520      DAL->AddFlagArg(A, Opts.getOption(options::OPT_dynamiclib));
1521      break;
1522
1523    case options::OPT_fconstant_cfstrings:
1524      DAL->AddFlagArg(A, Opts.getOption(options::OPT_mconstant_cfstrings));
1525      break;
1526
1527    case options::OPT_fno_constant_cfstrings:
1528      DAL->AddFlagArg(A, Opts.getOption(options::OPT_mno_constant_cfstrings));
1529      break;
1530
1531    case options::OPT_Wnonportable_cfstrings:
1532      DAL->AddFlagArg(A,
1533                      Opts.getOption(options::OPT_mwarn_nonportable_cfstrings));
1534      break;
1535
1536    case options::OPT_Wno_nonportable_cfstrings:
1537      DAL->AddFlagArg(
1538          A, Opts.getOption(options::OPT_mno_warn_nonportable_cfstrings));
1539      break;
1540
1541    case options::OPT_fpascal_strings:
1542      DAL->AddFlagArg(A, Opts.getOption(options::OPT_mpascal_strings));
1543      break;
1544
1545    case options::OPT_fno_pascal_strings:
1546      DAL->AddFlagArg(A, Opts.getOption(options::OPT_mno_pascal_strings));
1547      break;
1548    }
1549  }
1550
1551  if (getTriple().getArch() == llvm::Triple::x86 ||
1552      getTriple().getArch() == llvm::Triple::x86_64)
1553    if (!Args.hasArgNoClaim(options::OPT_mtune_EQ))
1554      DAL->AddJoinedArg(nullptr, Opts.getOption(options::OPT_mtune_EQ),
1555                        "core2");
1556
1557  // Add the arch options based on the particular spelling of -arch, to match
1558  // how the driver driver works.
1559  if (!BoundArch.empty()) {
1560    StringRef Name = BoundArch;
1561    const Option MCpu = Opts.getOption(options::OPT_mcpu_EQ);
1562    const Option MArch = Opts.getOption(clang::driver::options::OPT_march_EQ);
1563
1564    // This code must be kept in sync with LLVM's getArchTypeForDarwinArch,
1565    // which defines the list of which architectures we accept.
1566    if (Name == "ppc")
1567      ;
1568    else if (Name == "ppc601")
1569      DAL->AddJoinedArg(nullptr, MCpu, "601");
1570    else if (Name == "ppc603")
1571      DAL->AddJoinedArg(nullptr, MCpu, "603");
1572    else if (Name == "ppc604")
1573      DAL->AddJoinedArg(nullptr, MCpu, "604");
1574    else if (Name == "ppc604e")
1575      DAL->AddJoinedArg(nullptr, MCpu, "604e");
1576    else if (Name == "ppc750")
1577      DAL->AddJoinedArg(nullptr, MCpu, "750");
1578    else if (Name == "ppc7400")
1579      DAL->AddJoinedArg(nullptr, MCpu, "7400");
1580    else if (Name == "ppc7450")
1581      DAL->AddJoinedArg(nullptr, MCpu, "7450");
1582    else if (Name == "ppc970")
1583      DAL->AddJoinedArg(nullptr, MCpu, "970");
1584
1585    else if (Name == "ppc64" || Name == "ppc64le")
1586      DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_m64));
1587
1588    else if (Name == "i386")
1589      ;
1590    else if (Name == "i486")
1591      DAL->AddJoinedArg(nullptr, MArch, "i486");
1592    else if (Name == "i586")
1593      DAL->AddJoinedArg(nullptr, MArch, "i586");
1594    else if (Name == "i686")
1595      DAL->AddJoinedArg(nullptr, MArch, "i686");
1596    else if (Name == "pentium")
1597      DAL->AddJoinedArg(nullptr, MArch, "pentium");
1598    else if (Name == "pentium2")
1599      DAL->AddJoinedArg(nullptr, MArch, "pentium2");
1600    else if (Name == "pentpro")
1601      DAL->AddJoinedArg(nullptr, MArch, "pentiumpro");
1602    else if (Name == "pentIIm3")
1603      DAL->AddJoinedArg(nullptr, MArch, "pentium2");
1604
1605    else if (Name == "x86_64")
1606      DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_m64));
1607    else if (Name == "x86_64h") {
1608      DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_m64));
1609      DAL->AddJoinedArg(nullptr, MArch, "x86_64h");
1610    }
1611
1612    else if (Name == "arm")
1613      DAL->AddJoinedArg(nullptr, MArch, "armv4t");
1614    else if (Name == "armv4t")
1615      DAL->AddJoinedArg(nullptr, MArch, "armv4t");
1616    else if (Name == "armv5")
1617      DAL->AddJoinedArg(nullptr, MArch, "armv5tej");
1618    else if (Name == "xscale")
1619      DAL->AddJoinedArg(nullptr, MArch, "xscale");
1620    else if (Name == "armv6")
1621      DAL->AddJoinedArg(nullptr, MArch, "armv6k");
1622    else if (Name == "armv6m")
1623      DAL->AddJoinedArg(nullptr, MArch, "armv6m");
1624    else if (Name == "armv7")
1625      DAL->AddJoinedArg(nullptr, MArch, "armv7a");
1626    else if (Name == "armv7em")
1627      DAL->AddJoinedArg(nullptr, MArch, "armv7em");
1628    else if (Name == "armv7k")
1629      DAL->AddJoinedArg(nullptr, MArch, "armv7k");
1630    else if (Name == "armv7m")
1631      DAL->AddJoinedArg(nullptr, MArch, "armv7m");
1632    else if (Name == "armv7s")
1633      DAL->AddJoinedArg(nullptr, MArch, "armv7s");
1634  }
1635
1636  return DAL;
1637}
1638
1639void MachO::AddLinkRuntimeLibArgs(const ArgList &Args,
1640                                  ArgStringList &CmdArgs) const {
1641  // Embedded targets are simple at the moment, not supporting sanitizers and
1642  // with different libraries for each member of the product { static, PIC } x
1643  // { hard-float, soft-float }
1644  llvm::SmallString<32> CompilerRT = StringRef("libclang_rt.");
1645  CompilerRT +=
1646      (tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)
1647          ? "hard"
1648          : "soft";
1649  CompilerRT += Args.hasArg(options::OPT_fPIC) ? "_pic.a" : "_static.a";
1650
1651  AddLinkRuntimeLib(Args, CmdArgs, CompilerRT, false, true);
1652}
1653
1654DerivedArgList *
1655Darwin::TranslateArgs(const DerivedArgList &Args, StringRef BoundArch,
1656                      Action::OffloadKind DeviceOffloadKind) const {
1657  // First get the generic Apple args, before moving onto Darwin-specific ones.
1658  DerivedArgList *DAL =
1659      MachO::TranslateArgs(Args, BoundArch, DeviceOffloadKind);
1660  const OptTable &Opts = getDriver().getOpts();
1661
1662  // If no architecture is bound, none of the translations here are relevant.
1663  if (BoundArch.empty())
1664    return DAL;
1665
1666  // Add an explicit version min argument for the deployment target. We do this
1667  // after argument translation because -Xarch_ arguments may add a version min
1668  // argument.
1669  AddDeploymentTarget(*DAL);
1670
1671  // For iOS 6, undo the translation to add -static for -mkernel/-fapple-kext.
1672  // FIXME: It would be far better to avoid inserting those -static arguments,
1673  // but we can't check the deployment target in the translation code until
1674  // it is set here.
1675  if (isTargetWatchOSBased() ||
1676      (isTargetIOSBased() && !isIPhoneOSVersionLT(6, 0))) {
1677    for (ArgList::iterator it = DAL->begin(), ie = DAL->end(); it != ie; ) {
1678      Arg *A = *it;
1679      ++it;
1680      if (A->getOption().getID() != options::OPT_mkernel &&
1681          A->getOption().getID() != options::OPT_fapple_kext)
1682        continue;
1683      assert(it != ie && "unexpected argument translation");
1684      A = *it;
1685      assert(A->getOption().getID() == options::OPT_static &&
1686             "missing expected -static argument");
1687      *it = nullptr;
1688      ++it;
1689    }
1690  }
1691
1692  if (!Args.getLastArg(options::OPT_stdlib_EQ) &&
1693      GetCXXStdlibType(Args) == ToolChain::CST_Libcxx)
1694    DAL->AddJoinedArg(nullptr, Opts.getOption(options::OPT_stdlib_EQ),
1695                      "libc++");
1696
1697  // Validate the C++ standard library choice.
1698  CXXStdlibType Type = GetCXXStdlibType(*DAL);
1699  if (Type == ToolChain::CST_Libcxx) {
1700    // Check whether the target provides libc++.
1701    StringRef where;
1702
1703    // Complain about targeting iOS < 5.0 in any way.
1704    if (isTargetIOSBased() && isIPhoneOSVersionLT(5, 0))
1705      where = "iOS 5.0";
1706
1707    if (where != StringRef()) {
1708      getDriver().Diag(clang::diag::err_drv_invalid_libcxx_deployment) << where;
1709    }
1710  }
1711
1712  auto Arch = tools::darwin::getArchTypeForMachOArchName(BoundArch);
1713  if ((Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb)) {
1714    if (Args.hasFlag(options::OPT_fomit_frame_pointer,
1715                     options::OPT_fno_omit_frame_pointer, false))
1716      getDriver().Diag(clang::diag::warn_drv_unsupported_opt_for_target)
1717          << "-fomit-frame-pointer" << BoundArch;
1718  }
1719
1720  return DAL;
1721}
1722
1723bool MachO::IsUnwindTablesDefault() const {
1724  return getArch() == llvm::Triple::x86_64;
1725}
1726
1727bool MachO::UseDwarfDebugFlags() const {
1728  if (const char *S = ::getenv("RC_DEBUG_OPTIONS"))
1729    return S[0] != '\0';
1730  return false;
1731}
1732
1733bool Darwin::UseSjLjExceptions(const ArgList &Args) const {
1734  // Darwin uses SjLj exceptions on ARM.
1735  if (getTriple().getArch() != llvm::Triple::arm &&
1736      getTriple().getArch() != llvm::Triple::thumb)
1737    return false;
1738
1739  // Only watchOS uses the new DWARF/Compact unwinding method.
1740  llvm::Triple Triple(ComputeLLVMTriple(Args));
1741  return !Triple.isWatchABI();
1742}
1743
1744bool Darwin::SupportsEmbeddedBitcode() const {
1745  assert(TargetInitialized && "Target not initialized!");
1746  if (isTargetIPhoneOS() && isIPhoneOSVersionLT(6, 0))
1747    return false;
1748  return true;
1749}
1750
1751bool MachO::isPICDefault() const { return true; }
1752
1753bool MachO::isPIEDefault() const { return false; }
1754
1755bool MachO::isPICDefaultForced() const {
1756  return (getArch() == llvm::Triple::x86_64 ||
1757          getArch() == llvm::Triple::aarch64);
1758}
1759
1760bool MachO::SupportsProfiling() const {
1761  // Profiling instrumentation is only supported on x86.
1762  return getArch() == llvm::Triple::x86 || getArch() == llvm::Triple::x86_64;
1763}
1764
1765void Darwin::addMinVersionArgs(const ArgList &Args,
1766                               ArgStringList &CmdArgs) const {
1767  VersionTuple TargetVersion = getTargetVersion();
1768
1769  if (isTargetWatchOS())
1770    CmdArgs.push_back("-watchos_version_min");
1771  else if (isTargetWatchOSSimulator())
1772    CmdArgs.push_back("-watchos_simulator_version_min");
1773  else if (isTargetTvOS())
1774    CmdArgs.push_back("-tvos_version_min");
1775  else if (isTargetTvOSSimulator())
1776    CmdArgs.push_back("-tvos_simulator_version_min");
1777  else if (isTargetIOSSimulator())
1778    CmdArgs.push_back("-ios_simulator_version_min");
1779  else if (isTargetIOSBased())
1780    CmdArgs.push_back("-iphoneos_version_min");
1781  else {
1782    assert(isTargetMacOS() && "unexpected target");
1783    CmdArgs.push_back("-macosx_version_min");
1784  }
1785
1786  CmdArgs.push_back(Args.MakeArgString(TargetVersion.getAsString()));
1787}
1788
1789void Darwin::addStartObjectFileArgs(const ArgList &Args,
1790                                    ArgStringList &CmdArgs) const {
1791  // Derived from startfile spec.
1792  if (Args.hasArg(options::OPT_dynamiclib)) {
1793    // Derived from darwin_dylib1 spec.
1794    if (isTargetWatchOSBased()) {
1795      ; // watchOS does not need dylib1.o.
1796    } else if (isTargetIOSSimulator()) {
1797      ; // iOS simulator does not need dylib1.o.
1798    } else if (isTargetIPhoneOS()) {
1799      if (isIPhoneOSVersionLT(3, 1))
1800        CmdArgs.push_back("-ldylib1.o");
1801    } else {
1802      if (isMacosxVersionLT(10, 5))
1803        CmdArgs.push_back("-ldylib1.o");
1804      else if (isMacosxVersionLT(10, 6))
1805        CmdArgs.push_back("-ldylib1.10.5.o");
1806    }
1807  } else {
1808    if (Args.hasArg(options::OPT_bundle)) {
1809      if (!Args.hasArg(options::OPT_static)) {
1810        // Derived from darwin_bundle1 spec.
1811        if (isTargetWatchOSBased()) {
1812          ; // watchOS does not need bundle1.o.
1813        } else if (isTargetIOSSimulator()) {
1814          ; // iOS simulator does not need bundle1.o.
1815        } else if (isTargetIPhoneOS()) {
1816          if (isIPhoneOSVersionLT(3, 1))
1817            CmdArgs.push_back("-lbundle1.o");
1818        } else {
1819          if (isMacosxVersionLT(10, 6))
1820            CmdArgs.push_back("-lbundle1.o");
1821        }
1822      }
1823    } else {
1824      if (Args.hasArg(options::OPT_pg) && SupportsProfiling()) {
1825        if (Args.hasArg(options::OPT_static) ||
1826            Args.hasArg(options::OPT_object) ||
1827            Args.hasArg(options::OPT_preload)) {
1828          CmdArgs.push_back("-lgcrt0.o");
1829        } else {
1830          CmdArgs.push_back("-lgcrt1.o");
1831
1832          // darwin_crt2 spec is empty.
1833        }
1834        // By default on OS X 10.8 and later, we don't link with a crt1.o
1835        // file and the linker knows to use _main as the entry point.  But,
1836        // when compiling with -pg, we need to link with the gcrt1.o file,
1837        // so pass the -no_new_main option to tell the linker to use the
1838        // "start" symbol as the entry point.
1839        if (isTargetMacOS() && !isMacosxVersionLT(10, 8))
1840          CmdArgs.push_back("-no_new_main");
1841      } else {
1842        if (Args.hasArg(options::OPT_static) ||
1843            Args.hasArg(options::OPT_object) ||
1844            Args.hasArg(options::OPT_preload)) {
1845          CmdArgs.push_back("-lcrt0.o");
1846        } else {
1847          // Derived from darwin_crt1 spec.
1848          if (isTargetWatchOSBased()) {
1849            ; // watchOS does not need crt1.o.
1850          } else if (isTargetIOSSimulator()) {
1851            ; // iOS simulator does not need crt1.o.
1852          } else if (isTargetIPhoneOS()) {
1853            if (getArch() == llvm::Triple::aarch64)
1854              ; // iOS does not need any crt1 files for arm64
1855            else if (isIPhoneOSVersionLT(3, 1))
1856              CmdArgs.push_back("-lcrt1.o");
1857            else if (isIPhoneOSVersionLT(6, 0))
1858              CmdArgs.push_back("-lcrt1.3.1.o");
1859          } else {
1860            if (isMacosxVersionLT(10, 5))
1861              CmdArgs.push_back("-lcrt1.o");
1862            else if (isMacosxVersionLT(10, 6))
1863              CmdArgs.push_back("-lcrt1.10.5.o");
1864            else if (isMacosxVersionLT(10, 8))
1865              CmdArgs.push_back("-lcrt1.10.6.o");
1866
1867            // darwin_crt2 spec is empty.
1868          }
1869        }
1870      }
1871    }
1872  }
1873
1874  if (!isTargetIPhoneOS() && Args.hasArg(options::OPT_shared_libgcc) &&
1875      !isTargetWatchOS() &&
1876      isMacosxVersionLT(10, 5)) {
1877    const char *Str = Args.MakeArgString(GetFilePath("crt3.o"));
1878    CmdArgs.push_back(Str);
1879  }
1880}
1881
1882bool Darwin::SupportsObjCGC() const { return isTargetMacOS(); }
1883
1884void Darwin::CheckObjCARC() const {
1885  if (isTargetIOSBased() || isTargetWatchOSBased() ||
1886      (isTargetMacOS() && !isMacosxVersionLT(10, 6)))
1887    return;
1888  getDriver().Diag(diag::err_arc_unsupported_on_toolchain);
1889}
1890
1891SanitizerMask Darwin::getSupportedSanitizers() const {
1892  const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
1893  SanitizerMask Res = ToolChain::getSupportedSanitizers();
1894  Res |= SanitizerKind::Address;
1895  if (isTargetMacOS()) {
1896    if (!isMacosxVersionLT(10, 9))
1897      Res |= SanitizerKind::Vptr;
1898    Res |= SanitizerKind::SafeStack;
1899    if (IsX86_64)
1900      Res |= SanitizerKind::Thread;
1901  } else if (isTargetIOSSimulator() || isTargetTvOSSimulator()) {
1902    if (IsX86_64)
1903      Res |= SanitizerKind::Thread;
1904  }
1905  return Res;
1906}
1907
1908void Darwin::printVerboseInfo(raw_ostream &OS) const {
1909  CudaInstallation.print(OS);
1910}
1911