xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/FreeBSD.cpp (revision a4a491e2238b12ccd64d3faf9e6401487f6f1f1b) 
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(D, 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.contains('='))
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(Args));
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 if (!Args.hasArg(options::OPT_r)) {
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     CmdArgs.push_back("-X");
227     break;
228   case llvm::Triple::riscv64:
229     CmdArgs.push_back("-m");
230     CmdArgs.push_back("elf64lriscv");
231     CmdArgs.push_back("-X");
232     break;
233   default:
234     break;
235   }
236 
237   if (Arg *A = Args.getLastArg(options::OPT_G)) {
238     if (ToolChain.getTriple().isMIPS()) {
239       StringRef v = A->getValue();
240       CmdArgs.push_back(Args.MakeArgString("-G" + v));
241       A->claim();
242     }
243   }
244 
245   if (Output.isFilename()) {
246     CmdArgs.push_back("-o");
247     CmdArgs.push_back(Output.getFilename());
248   } else {
249     assert(Output.isNothing() && "Invalid output.");
250   }
251 
252   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
253                    options::OPT_r)) {
254     const char *crt1 = nullptr;
255     if (!Args.hasArg(options::OPT_shared)) {
256       if (Args.hasArg(options::OPT_pg))
257         crt1 = "gcrt1.o";
258       else if (IsPIE)
259         crt1 = "Scrt1.o";
260       else
261         crt1 = "crt1.o";
262     }
263     if (crt1)
264       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
265 
266     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
267 
268     const char *crtbegin = nullptr;
269     if (Args.hasArg(options::OPT_static))
270       crtbegin = "crtbeginT.o";
271     else if (Args.hasArg(options::OPT_shared) || IsPIE)
272       crtbegin = "crtbeginS.o";
273     else
274       crtbegin = "crtbegin.o";
275 
276     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
277   }
278 
279   Args.AddAllArgs(CmdArgs, options::OPT_L);
280   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
281   Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
282   Args.AddAllArgs(CmdArgs, options::OPT_e);
283   Args.AddAllArgs(CmdArgs, options::OPT_s);
284   Args.AddAllArgs(CmdArgs, options::OPT_t);
285   Args.AddAllArgs(CmdArgs, options::OPT_Z_Flag);
286   Args.AddAllArgs(CmdArgs, options::OPT_r);
287 
288   if (D.isUsingLTO()) {
289     assert(!Inputs.empty() && "Must have at least one input.");
290     addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],
291                   D.getLTOMode() == LTOK_Thin);
292   }
293 
294   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
295   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
296   addLinkerCompressDebugSectionsOption(ToolChain, Args, CmdArgs);
297   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
298 
299   unsigned Major = ToolChain.getTriple().getOSMajorVersion();
300   bool Profiling = Args.hasArg(options::OPT_pg) && Major != 0 && Major < 14;
301   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
302                    options::OPT_r)) {
303     // Use the static OpenMP runtime with -static-openmp
304     bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
305                         !Args.hasArg(options::OPT_static);
306     addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP);
307 
308     if (D.CCCIsCXX()) {
309       if (ToolChain.ShouldLinkCXXStdlib(Args))
310         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
311       if (Profiling)
312         CmdArgs.push_back("-lm_p");
313       else
314         CmdArgs.push_back("-lm");
315     }
316     if (NeedsSanitizerDeps)
317       linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
318     if (NeedsXRayDeps)
319       linkXRayRuntimeDeps(ToolChain, CmdArgs);
320     // FIXME: For some reason GCC passes -lgcc and -lgcc_s before adding
321     // the default system libraries. Just mimic this for now.
322     if (Profiling)
323       CmdArgs.push_back("-lgcc_p");
324     else
325       CmdArgs.push_back("-lgcc");
326     if (Args.hasArg(options::OPT_static)) {
327       CmdArgs.push_back("-lgcc_eh");
328     } else if (Profiling) {
329       CmdArgs.push_back("-lgcc_eh_p");
330     } else {
331       CmdArgs.push_back("--as-needed");
332       CmdArgs.push_back("-lgcc_s");
333       CmdArgs.push_back("--no-as-needed");
334     }
335 
336     if (Args.hasArg(options::OPT_pthread)) {
337       if (Profiling)
338         CmdArgs.push_back("-lpthread_p");
339       else
340         CmdArgs.push_back("-lpthread");
341     }
342 
343     if (Profiling) {
344       if (Args.hasArg(options::OPT_shared))
345         CmdArgs.push_back("-lc");
346       else
347         CmdArgs.push_back("-lc_p");
348       CmdArgs.push_back("-lgcc_p");
349     } else {
350       CmdArgs.push_back("-lc");
351       CmdArgs.push_back("-lgcc");
352     }
353 
354     if (Args.hasArg(options::OPT_static)) {
355       CmdArgs.push_back("-lgcc_eh");
356     } else if (Profiling) {
357       CmdArgs.push_back("-lgcc_eh_p");
358     } else {
359       CmdArgs.push_back("--as-needed");
360       CmdArgs.push_back("-lgcc_s");
361       CmdArgs.push_back("--no-as-needed");
362     }
363   }
364 
365   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
366                    options::OPT_r)) {
367     if (Args.hasArg(options::OPT_shared) || IsPIE)
368       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtendS.o")));
369     else
370       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
371     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
372   }
373 
374   ToolChain.addProfileRTLibs(Args, CmdArgs);
375 
376   const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
377   C.addCommand(std::make_unique<Command>(JA, *this,
378                                          ResponseFileSupport::AtFileCurCP(),
379                                          Exec, CmdArgs, Inputs, Output));
380 }
381 
382 /// FreeBSD - FreeBSD tool chain which can call as(1) and ld(1) directly.
383 
384 FreeBSD::FreeBSD(const Driver &D, const llvm::Triple &Triple,
385                  const ArgList &Args)
386     : Generic_ELF(D, Triple, Args) {
387 
388   // When targeting 32-bit platforms, look for '/usr/lib32/crt1.o' and fall
389   // back to '/usr/lib' if it doesn't exist.
390   if ((Triple.getArch() == llvm::Triple::x86 || Triple.isMIPS32() ||
391        Triple.isPPC32()) &&
392       D.getVFS().exists(concat(getDriver().SysRoot, "/usr/lib32/crt1.o")))
393     getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib32"));
394   else
395     getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib"));
396 }
397 
398 ToolChain::CXXStdlibType FreeBSD::GetDefaultCXXStdlibType() const {
399   unsigned Major = getTriple().getOSMajorVersion();
400   if (Major >= 10 || Major == 0)
401     return ToolChain::CST_Libcxx;
402   return ToolChain::CST_Libstdcxx;
403 }
404 
405 unsigned FreeBSD::GetDefaultDwarfVersion() const {
406   if (getTriple().getOSMajorVersion() < 12)
407     return 2;
408   return 4;
409 }
410 
411 void FreeBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
412                                     llvm::opt::ArgStringList &CC1Args) const {
413   addSystemInclude(DriverArgs, CC1Args,
414                    concat(getDriver().SysRoot, "/usr/include/c++/v1"));
415 }
416 
417 void FreeBSD::addLibStdCxxIncludePaths(
418     const llvm::opt::ArgList &DriverArgs,
419     llvm::opt::ArgStringList &CC1Args) const {
420   addLibStdCXXIncludePaths(concat(getDriver().SysRoot, "/usr/include/c++/4.2"),
421                            "", "", DriverArgs, CC1Args);
422 }
423 
424 void FreeBSD::AddCXXStdlibLibArgs(const ArgList &Args,
425                                   ArgStringList &CmdArgs) const {
426   CXXStdlibType Type = GetCXXStdlibType(Args);
427   unsigned Major = getTriple().getOSMajorVersion();
428   bool Profiling = Args.hasArg(options::OPT_pg) && Major != 0 && Major < 14;
429 
430   switch (Type) {
431   case ToolChain::CST_Libcxx:
432     CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
433     if (Args.hasArg(options::OPT_fexperimental_library))
434       CmdArgs.push_back("-lc++experimental");
435     break;
436 
437   case ToolChain::CST_Libstdcxx:
438     CmdArgs.push_back(Profiling ? "-lstdc++_p" : "-lstdc++");
439     break;
440   }
441 }
442 
443 void FreeBSD::AddCudaIncludeArgs(const ArgList &DriverArgs,
444                                  ArgStringList &CC1Args) const {
445   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
446 }
447 
448 void FreeBSD::AddHIPIncludeArgs(const ArgList &DriverArgs,
449                                 ArgStringList &CC1Args) const {
450   RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
451 }
452 
453 Tool *FreeBSD::buildAssembler() const {
454   return new tools::freebsd::Assembler(*this);
455 }
456 
457 Tool *FreeBSD::buildLinker() const { return new tools::freebsd::Linker(*this); }
458 
459 llvm::ExceptionHandling FreeBSD::GetExceptionModel(const ArgList &Args) const {
460   // FreeBSD uses SjLj exceptions on ARM oabi.
461   switch (getTriple().getEnvironment()) {
462   case llvm::Triple::GNUEABIHF:
463   case llvm::Triple::GNUEABI:
464   case llvm::Triple::EABI:
465     return llvm::ExceptionHandling::None;
466   default:
467     if (getTriple().getArch() == llvm::Triple::arm ||
468         getTriple().getArch() == llvm::Triple::thumb)
469       return llvm::ExceptionHandling::SjLj;
470     return llvm::ExceptionHandling::None;
471   }
472 }
473 
474 bool FreeBSD::HasNativeLLVMSupport() const { return true; }
475 
476 bool FreeBSD::IsUnwindTablesDefault(const ArgList &Args) const { return true; }
477 
478 bool FreeBSD::isPIEDefault(const llvm::opt::ArgList &Args) const {
479   return getSanitizerArgs(Args).requiresPIE();
480 }
481 
482 SanitizerMask FreeBSD::getSupportedSanitizers() const {
483   const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64;
484   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
485   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
486   const bool IsMIPS64 = getTriple().isMIPS64();
487   SanitizerMask Res = ToolChain::getSupportedSanitizers();
488   Res |= SanitizerKind::Address;
489   Res |= SanitizerKind::PointerCompare;
490   Res |= SanitizerKind::PointerSubtract;
491   Res |= SanitizerKind::Vptr;
492   if (IsAArch64 || IsX86_64 || IsMIPS64) {
493     Res |= SanitizerKind::Leak;
494     Res |= SanitizerKind::Thread;
495   }
496   if (IsX86 || IsX86_64) {
497     Res |= SanitizerKind::Function;
498   }
499   if (IsAArch64 || IsX86 || IsX86_64) {
500     Res |= SanitizerKind::SafeStack;
501     Res |= SanitizerKind::Fuzzer;
502     Res |= SanitizerKind::FuzzerNoLink;
503   }
504   if (IsAArch64 || IsX86_64) {
505     Res |= SanitizerKind::KernelAddress;
506     Res |= SanitizerKind::KernelMemory;
507     Res |= SanitizerKind::Memory;
508   }
509   return Res;
510 }
511 
512 void FreeBSD::addClangTargetOptions(const ArgList &DriverArgs,
513                                     ArgStringList &CC1Args,
514                                     Action::OffloadKind) const {
515   if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
516                           options::OPT_fno_use_init_array,
517                           getTriple().getOSMajorVersion() >= 12))
518     CC1Args.push_back("-fno-use-init-array");
519 }
520