xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/FreeBSD.cpp (revision 0d8fe2373503aeac48492f28073049a8bfa4feb5) 
1 //===--- FreeBSD.cpp - FreeBSD ToolChain Implementations --------*- C++ -*-===//
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 "FreeBSD.h"
10 #include "Arch/ARM.h"
11 #include "Arch/Mips.h"
12 #include "Arch/Sparc.h"
13 #include "CommonArgs.h"
14 #include "clang/Driver/Compilation.h"
15 #include "clang/Driver/DriverDiagnostic.h"
16 #include "clang/Driver/Options.h"
17 #include "clang/Driver/SanitizerArgs.h"
18 #include "llvm/Option/ArgList.h"
19 #include "llvm/Support/VirtualFileSystem.h"
20 
21 using namespace clang::driver;
22 using namespace clang::driver::tools;
23 using namespace clang::driver::toolchains;
24 using namespace clang;
25 using namespace llvm::opt;
26 
27 void freebsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
28                                       const InputInfo &Output,
29                                       const InputInfoList &Inputs,
30                                       const ArgList &Args,
31                                       const char *LinkingOutput) const {
32   claimNoWarnArgs(Args);
33   ArgStringList CmdArgs;
34   const auto &D = getToolChain().getDriver();
35 
36   // When building 32-bit code on FreeBSD/amd64, we have to explicitly
37   // instruct as in the base system to assemble 32-bit code.
38   switch (getToolChain().getArch()) {
39   default:
40     break;
41   case llvm::Triple::x86:
42     CmdArgs.push_back("--32");
43     break;
44   case llvm::Triple::ppc:
45   case llvm::Triple::ppcle:
46     CmdArgs.push_back("-a32");
47     break;
48   case llvm::Triple::mips:
49   case llvm::Triple::mipsel:
50   case llvm::Triple::mips64:
51   case llvm::Triple::mips64el: {
52     StringRef CPUName;
53     StringRef ABIName;
54     mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
55 
56     CmdArgs.push_back("-march");
57     CmdArgs.push_back(CPUName.data());
58 
59     CmdArgs.push_back("-mabi");
60     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
61 
62     if (getToolChain().getTriple().isLittleEndian())
63       CmdArgs.push_back("-EL");
64     else
65       CmdArgs.push_back("-EB");
66 
67     if (Arg *A = Args.getLastArg(options::OPT_G)) {
68       StringRef v = A->getValue();
69       CmdArgs.push_back(Args.MakeArgString("-G" + v));
70       A->claim();
71     }
72 
73     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
74     break;
75   }
76   case llvm::Triple::arm:
77   case llvm::Triple::armeb:
78   case llvm::Triple::thumb:
79   case llvm::Triple::thumbeb: {
80     arm::FloatABI ABI = arm::getARMFloatABI(getToolChain(), Args);
81 
82     if (ABI == arm::FloatABI::Hard)
83       CmdArgs.push_back("-mfpu=vfp");
84     else
85       CmdArgs.push_back("-mfpu=softvfp");
86 
87     switch (getToolChain().getTriple().getEnvironment()) {
88     case llvm::Triple::GNUEABIHF:
89     case llvm::Triple::GNUEABI:
90     case llvm::Triple::EABI:
91       CmdArgs.push_back("-meabi=5");
92       break;
93 
94     default:
95       CmdArgs.push_back("-matpcs");
96     }
97     break;
98   }
99   case llvm::Triple::sparc:
100   case llvm::Triple::sparcel:
101   case llvm::Triple::sparcv9: {
102     std::string CPU = getCPUName(Args, getToolChain().getTriple());
103     CmdArgs.push_back(
104         sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
105     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
106     break;
107   }
108   }
109 
110   for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
111                                     options::OPT_fdebug_prefix_map_EQ)) {
112     StringRef Map = A->getValue();
113     if (Map.find('=') == StringRef::npos)
114       D.Diag(diag::err_drv_invalid_argument_to_option)
115           << Map << A->getOption().getName();
116     else {
117       CmdArgs.push_back(Args.MakeArgString("--debug-prefix-map"));
118       CmdArgs.push_back(Args.MakeArgString(Map));
119     }
120     A->claim();
121   }
122 
123   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
124 
125   CmdArgs.push_back("-o");
126   CmdArgs.push_back(Output.getFilename());
127 
128   for (const auto &II : Inputs)
129     CmdArgs.push_back(II.getFilename());
130 
131   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
132   C.addCommand(std::make_unique<Command>(JA, *this,
133                                          ResponseFileSupport::AtFileCurCP(),
134                                          Exec, CmdArgs, Inputs, Output));
135 }
136 
137 void freebsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
138                                    const InputInfo &Output,
139                                    const InputInfoList &Inputs,
140                                    const ArgList &Args,
141                                    const char *LinkingOutput) const {
142   const toolchains::FreeBSD &ToolChain =
143       static_cast<const toolchains::FreeBSD &>(getToolChain());
144   const Driver &D = ToolChain.getDriver();
145   const llvm::Triple::ArchType Arch = ToolChain.getArch();
146   const bool IsPIE =
147       !Args.hasArg(options::OPT_shared) &&
148       (Args.hasArg(options::OPT_pie) || ToolChain.isPIEDefault());
149   ArgStringList CmdArgs;
150 
151   // Silence warning for "clang -g foo.o -o foo"
152   Args.ClaimAllArgs(options::OPT_g_Group);
153   // and "clang -emit-llvm foo.o -o foo"
154   Args.ClaimAllArgs(options::OPT_emit_llvm);
155   // and for "clang -w foo.o -o foo". Other warning options are already
156   // handled somewhere else.
157   Args.ClaimAllArgs(options::OPT_w);
158 
159   if (!D.SysRoot.empty())
160     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
161 
162   if (IsPIE)
163     CmdArgs.push_back("-pie");
164 
165   CmdArgs.push_back("--eh-frame-hdr");
166   if (Args.hasArg(options::OPT_static)) {
167     CmdArgs.push_back("-Bstatic");
168   } else {
169     if (Args.hasArg(options::OPT_rdynamic))
170       CmdArgs.push_back("-export-dynamic");
171     if (Args.hasArg(options::OPT_shared)) {
172       CmdArgs.push_back("-Bshareable");
173     } else {
174       CmdArgs.push_back("-dynamic-linker");
175       CmdArgs.push_back("/libexec/ld-elf.so.1");
176     }
177     const llvm::Triple &T = ToolChain.getTriple();
178     if (T.getOSMajorVersion() >= 9) {
179       if (Arch == llvm::Triple::arm || Arch == llvm::Triple::sparc || T.isX86())
180         CmdArgs.push_back("--hash-style=both");
181     }
182     CmdArgs.push_back("--enable-new-dtags");
183   }
184 
185   // Explicitly set the linker emulation for platforms that might not
186   // be the default emulation for the linker.
187   switch (Arch) {
188   case llvm::Triple::x86:
189     CmdArgs.push_back("-m");
190     CmdArgs.push_back("elf_i386_fbsd");
191     break;
192   case llvm::Triple::ppc:
193     CmdArgs.push_back("-m");
194     CmdArgs.push_back("elf32ppc_fbsd");
195     break;
196   case llvm::Triple::ppcle:
197     CmdArgs.push_back("-m");
198     // Use generic -- only usage is for freestanding.
199     CmdArgs.push_back("elf32lppc");
200     break;
201   case llvm::Triple::mips:
202     CmdArgs.push_back("-m");
203     CmdArgs.push_back("elf32btsmip_fbsd");
204     break;
205   case llvm::Triple::mipsel:
206     CmdArgs.push_back("-m");
207     CmdArgs.push_back("elf32ltsmip_fbsd");
208     break;
209   case llvm::Triple::mips64:
210     CmdArgs.push_back("-m");
211     if (tools::mips::hasMipsAbiArg(Args, "n32"))
212       CmdArgs.push_back("elf32btsmipn32_fbsd");
213     else
214       CmdArgs.push_back("elf64btsmip_fbsd");
215     break;
216   case llvm::Triple::mips64el:
217     CmdArgs.push_back("-m");
218     if (tools::mips::hasMipsAbiArg(Args, "n32"))
219       CmdArgs.push_back("elf32ltsmipn32_fbsd");
220     else
221       CmdArgs.push_back("elf64ltsmip_fbsd");
222     break;
223   case llvm::Triple::riscv32:
224     CmdArgs.push_back("-m");
225     CmdArgs.push_back("elf32lriscv");
226     break;
227   case llvm::Triple::riscv64:
228     CmdArgs.push_back("-m");
229     CmdArgs.push_back("elf64lriscv");
230     break;
231   default:
232     break;
233   }
234 
235   if (Arg *A = Args.getLastArg(options::OPT_G)) {
236     if (ToolChain.getTriple().isMIPS()) {
237       StringRef v = A->getValue();
238       CmdArgs.push_back(Args.MakeArgString("-G" + v));
239       A->claim();
240     }
241   }
242 
243   if (Output.isFilename()) {
244     CmdArgs.push_back("-o");
245     CmdArgs.push_back(Output.getFilename());
246   } else {
247     assert(Output.isNothing() && "Invalid output.");
248   }
249 
250   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
251     const char *crt1 = nullptr;
252     if (!Args.hasArg(options::OPT_shared)) {
253       if (Args.hasArg(options::OPT_pg))
254         crt1 = "gcrt1.o";
255       else if (IsPIE)
256         crt1 = "Scrt1.o";
257       else
258         crt1 = "crt1.o";
259     }
260     if (crt1)
261       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
262 
263     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
264 
265     const char *crtbegin = nullptr;
266     if (Args.hasArg(options::OPT_static))
267       crtbegin = "crtbeginT.o";
268     else if (Args.hasArg(options::OPT_shared) || IsPIE)
269       crtbegin = "crtbeginS.o";
270     else
271       crtbegin = "crtbegin.o";
272 
273     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
274   }
275 
276   Args.AddAllArgs(CmdArgs, options::OPT_L);
277   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
278   Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
279   Args.AddAllArgs(CmdArgs, options::OPT_e);
280   Args.AddAllArgs(CmdArgs, options::OPT_s);
281   Args.AddAllArgs(CmdArgs, options::OPT_t);
282   Args.AddAllArgs(CmdArgs, options::OPT_Z_Flag);
283   Args.AddAllArgs(CmdArgs, options::OPT_r);
284 
285   if (D.isUsingLTO()) {
286     assert(!Inputs.empty() && "Must have at least one input.");
287     addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],
288                   D.getLTOMode() == LTOK_Thin);
289   }
290 
291   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
292   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
293   addLinkerCompressDebugSectionsOption(ToolChain, Args, CmdArgs);
294   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
295 
296   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
297     // Use the static OpenMP runtime with -static-openmp
298     bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
299                         !Args.hasArg(options::OPT_static);
300     addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP);
301 
302     if (D.CCCIsCXX()) {
303       if (ToolChain.ShouldLinkCXXStdlib(Args))
304         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
305       if (Args.hasArg(options::OPT_pg))
306         CmdArgs.push_back("-lm_p");
307       else
308         CmdArgs.push_back("-lm");
309     }
310     if (NeedsSanitizerDeps)
311       linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
312     if (NeedsXRayDeps)
313       linkXRayRuntimeDeps(ToolChain, CmdArgs);
314     // FIXME: For some reason GCC passes -lgcc and -lgcc_s before adding
315     // the default system libraries. Just mimic this for now.
316     if (Args.hasArg(options::OPT_pg))
317       CmdArgs.push_back("-lgcc_p");
318     else
319       CmdArgs.push_back("-lgcc");
320     if (Args.hasArg(options::OPT_static)) {
321       CmdArgs.push_back("-lgcc_eh");
322     } else if (Args.hasArg(options::OPT_pg)) {
323       CmdArgs.push_back("-lgcc_eh_p");
324     } else {
325       CmdArgs.push_back("--as-needed");
326       CmdArgs.push_back("-lgcc_s");
327       CmdArgs.push_back("--no-as-needed");
328     }
329 
330     if (Args.hasArg(options::OPT_pthread)) {
331       if (Args.hasArg(options::OPT_pg))
332         CmdArgs.push_back("-lpthread_p");
333       else
334         CmdArgs.push_back("-lpthread");
335     }
336 
337     if (Args.hasArg(options::OPT_pg)) {
338       if (Args.hasArg(options::OPT_shared))
339         CmdArgs.push_back("-lc");
340       else
341         CmdArgs.push_back("-lc_p");
342       CmdArgs.push_back("-lgcc_p");
343     } else {
344       CmdArgs.push_back("-lc");
345       CmdArgs.push_back("-lgcc");
346     }
347 
348     if (Args.hasArg(options::OPT_static)) {
349       CmdArgs.push_back("-lgcc_eh");
350     } else if (Args.hasArg(options::OPT_pg)) {
351       CmdArgs.push_back("-lgcc_eh_p");
352     } else {
353       CmdArgs.push_back("--as-needed");
354       CmdArgs.push_back("-lgcc_s");
355       CmdArgs.push_back("--no-as-needed");
356     }
357   }
358 
359   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
360     if (Args.hasArg(options::OPT_shared) || IsPIE)
361       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtendS.o")));
362     else
363       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
364     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
365   }
366 
367   ToolChain.addProfileRTLibs(Args, CmdArgs);
368 
369   const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
370   C.addCommand(std::make_unique<Command>(JA, *this,
371                                          ResponseFileSupport::AtFileCurCP(),
372                                          Exec, CmdArgs, Inputs, Output));
373 }
374 
375 /// FreeBSD - FreeBSD tool chain which can call as(1) and ld(1) directly.
376 
377 FreeBSD::FreeBSD(const Driver &D, const llvm::Triple &Triple,
378                  const ArgList &Args)
379     : Generic_ELF(D, Triple, Args) {
380 
381   // When targeting 32-bit platforms, look for '/usr/lib32/crt1.o' and fall
382   // back to '/usr/lib' if it doesn't exist.
383   if ((Triple.getArch() == llvm::Triple::x86 || Triple.isMIPS32() ||
384        Triple.isPPC32()) &&
385       D.getVFS().exists(getDriver().SysRoot + "/usr/lib32/crt1.o"))
386     getFilePaths().push_back(getDriver().SysRoot + "/usr/lib32");
387   else
388     getFilePaths().push_back(getDriver().SysRoot + "/usr/lib");
389 }
390 
391 ToolChain::CXXStdlibType FreeBSD::GetDefaultCXXStdlibType() const {
392   if (getTriple().getOSMajorVersion() >= 10)
393     return ToolChain::CST_Libcxx;
394   return ToolChain::CST_Libstdcxx;
395 }
396 
397 unsigned FreeBSD::GetDefaultDwarfVersion() const {
398   if (getTriple().getOSMajorVersion() < 12)
399     return 2;
400   return 4;
401 }
402 
403 void FreeBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
404                                     llvm::opt::ArgStringList &CC1Args) const {
405   addSystemInclude(DriverArgs, CC1Args,
406                    getDriver().SysRoot + "/usr/include/c++/v1");
407 }
408 
409 void FreeBSD::addLibStdCxxIncludePaths(
410     const llvm::opt::ArgList &DriverArgs,
411     llvm::opt::ArgStringList &CC1Args) const {
412   addLibStdCXXIncludePaths(getDriver().SysRoot, "/usr/include/c++/4.2", "", "",
413                            "", "", DriverArgs, CC1Args);
414 }
415 
416 void FreeBSD::AddCXXStdlibLibArgs(const ArgList &Args,
417                                   ArgStringList &CmdArgs) const {
418   CXXStdlibType Type = GetCXXStdlibType(Args);
419   bool Profiling = Args.hasArg(options::OPT_pg);
420 
421   switch (Type) {
422   case ToolChain::CST_Libcxx:
423     CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
424     break;
425 
426   case ToolChain::CST_Libstdcxx:
427     CmdArgs.push_back(Profiling ? "-lstdc++_p" : "-lstdc++");
428     break;
429   }
430 }
431 
432 void FreeBSD::AddCudaIncludeArgs(const ArgList &DriverArgs,
433                                  ArgStringList &CC1Args) const {
434   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
435 }
436 
437 void FreeBSD::AddHIPIncludeArgs(const ArgList &DriverArgs,
438                                 ArgStringList &CC1Args) const {
439   RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
440 }
441 
442 Tool *FreeBSD::buildAssembler() const {
443   return new tools::freebsd::Assembler(*this);
444 }
445 
446 Tool *FreeBSD::buildLinker() const { return new tools::freebsd::Linker(*this); }
447 
448 llvm::ExceptionHandling FreeBSD::GetExceptionModel(const ArgList &Args) const {
449   // FreeBSD uses SjLj exceptions on ARM oabi.
450   switch (getTriple().getEnvironment()) {
451   case llvm::Triple::GNUEABIHF:
452   case llvm::Triple::GNUEABI:
453   case llvm::Triple::EABI:
454     return llvm::ExceptionHandling::None;
455   default:
456     if (getTriple().getArch() == llvm::Triple::arm ||
457         getTriple().getArch() == llvm::Triple::thumb)
458       return llvm::ExceptionHandling::SjLj;
459     return llvm::ExceptionHandling::None;
460   }
461 }
462 
463 bool FreeBSD::HasNativeLLVMSupport() const { return true; }
464 
465 bool FreeBSD::IsUnwindTablesDefault(const ArgList &Args) const { return true; }
466 
467 bool FreeBSD::isPIEDefault() const { return getSanitizerArgs().requiresPIE(); }
468 
469 SanitizerMask FreeBSD::getSupportedSanitizers() const {
470   const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64;
471   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
472   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
473   const bool IsMIPS64 = getTriple().isMIPS64();
474   SanitizerMask Res = ToolChain::getSupportedSanitizers();
475   Res |= SanitizerKind::Address;
476   Res |= SanitizerKind::PointerCompare;
477   Res |= SanitizerKind::PointerSubtract;
478   Res |= SanitizerKind::Vptr;
479   if (IsX86_64 || IsMIPS64) {
480     Res |= SanitizerKind::Leak;
481     Res |= SanitizerKind::Thread;
482   }
483   if (IsX86 || IsX86_64) {
484     Res |= SanitizerKind::Function;
485     Res |= SanitizerKind::SafeStack;
486     Res |= SanitizerKind::Fuzzer;
487     Res |= SanitizerKind::FuzzerNoLink;
488   }
489   if (IsAArch64 || IsX86_64) {
490     Res |= SanitizerKind::KernelAddress;
491     Res |= SanitizerKind::KernelMemory;
492   }
493   if (IsX86_64) {
494     Res |= SanitizerKind::Memory;
495   }
496   return Res;
497 }
498 
499 void FreeBSD::addClangTargetOptions(const ArgList &DriverArgs,
500                                     ArgStringList &CC1Args,
501                                     Action::OffloadKind) const {
502   if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
503                           options::OPT_fno_use_init_array,
504                           getTriple().getOSMajorVersion() >= 12))
505     CC1Args.push_back("-fno-use-init-array");
506 }
507