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/Config/config.h"
15 #include "clang/Driver/Compilation.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/Options.h"
18 #include "clang/Driver/SanitizerArgs.h"
19 #include "llvm/Option/ArgList.h"
20 #include "llvm/Support/VirtualFileSystem.h"
21 
22 using namespace clang::driver;
23 using namespace clang::driver::tools;
24 using namespace clang::driver::toolchains;
25 using namespace clang;
26 using namespace llvm::opt;
27 
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const28 void freebsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
29                                       const InputInfo &Output,
30                                       const InputInfoList &Inputs,
31                                       const ArgList &Args,
32                                       const char *LinkingOutput) const {
33   const auto &ToolChain = static_cast<const FreeBSD &>(getToolChain());
34   const auto &D = getToolChain().getDriver();
35   const llvm::Triple &Triple = ToolChain.getTriple();
36   ArgStringList CmdArgs;
37 
38   claimNoWarnArgs(Args);
39 
40   // When building 32-bit code on FreeBSD/amd64, we have to explicitly
41   // instruct as in the base system to assemble 32-bit code.
42   switch (ToolChain.getArch()) {
43   default:
44     break;
45   case llvm::Triple::x86:
46     CmdArgs.push_back("--32");
47     break;
48   case llvm::Triple::ppc:
49   case llvm::Triple::ppcle:
50     CmdArgs.push_back("-a32");
51     break;
52   case llvm::Triple::mips:
53   case llvm::Triple::mipsel:
54   case llvm::Triple::mips64:
55   case llvm::Triple::mips64el: {
56     StringRef CPUName;
57     StringRef ABIName;
58     mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
59 
60     CmdArgs.push_back("-march");
61     CmdArgs.push_back(CPUName.data());
62 
63     CmdArgs.push_back("-mabi");
64     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
65 
66     if (Triple.isLittleEndian())
67       CmdArgs.push_back("-EL");
68     else
69       CmdArgs.push_back("-EB");
70 
71     if (Arg *A = Args.getLastArg(options::OPT_G)) {
72       StringRef v = A->getValue();
73       CmdArgs.push_back(Args.MakeArgString("-G" + v));
74       A->claim();
75     }
76 
77     AddAssemblerKPIC(ToolChain, Args, CmdArgs);
78     break;
79   }
80   case llvm::Triple::arm:
81   case llvm::Triple::armeb:
82   case llvm::Triple::thumb:
83   case llvm::Triple::thumbeb: {
84     arm::FloatABI ABI = arm::getARMFloatABI(ToolChain, Args);
85 
86     if (ABI == arm::FloatABI::Hard)
87       CmdArgs.push_back("-mfpu=vfp");
88     else
89       CmdArgs.push_back("-mfpu=softvfp");
90 
91     CmdArgs.push_back("-meabi=5");
92     break;
93   }
94   case llvm::Triple::sparcv9: {
95     std::string CPU = getCPUName(D, Args, Triple);
96     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, Triple));
97     AddAssemblerKPIC(ToolChain, Args, CmdArgs);
98     break;
99   }
100   }
101 
102   for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
103                                     options::OPT_fdebug_prefix_map_EQ)) {
104     StringRef Map = A->getValue();
105     if (!Map.contains('='))
106       D.Diag(diag::err_drv_invalid_argument_to_option)
107           << Map << A->getOption().getName();
108     else {
109       CmdArgs.push_back(Args.MakeArgString("--debug-prefix-map"));
110       CmdArgs.push_back(Args.MakeArgString(Map));
111     }
112     A->claim();
113   }
114 
115   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
116 
117   CmdArgs.push_back("-o");
118   CmdArgs.push_back(Output.getFilename());
119 
120   for (const auto &II : Inputs)
121     CmdArgs.push_back(II.getFilename());
122 
123   const char *Exec = Args.MakeArgString(ToolChain.GetProgramPath("as"));
124   C.addCommand(std::make_unique<Command>(JA, *this,
125                                          ResponseFileSupport::AtFileCurCP(),
126                                          Exec, CmdArgs, Inputs, Output));
127 }
128 
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const129 void freebsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
130                                    const InputInfo &Output,
131                                    const InputInfoList &Inputs,
132                                    const ArgList &Args,
133                                    const char *LinkingOutput) const {
134   const auto &ToolChain = static_cast<const FreeBSD &>(getToolChain());
135   const Driver &D = ToolChain.getDriver();
136   const llvm::Triple::ArchType Arch = ToolChain.getArch();
137   const bool IsPIE =
138       !Args.hasArg(options::OPT_shared) &&
139       (Args.hasArg(options::OPT_pie) || ToolChain.isPIEDefault(Args));
140   ArgStringList CmdArgs;
141 
142   // Silence warning for "clang -g foo.o -o foo"
143   Args.ClaimAllArgs(options::OPT_g_Group);
144   // and "clang -emit-llvm foo.o -o foo"
145   Args.ClaimAllArgs(options::OPT_emit_llvm);
146   // and for "clang -w foo.o -o foo". Other warning options are already
147   // handled somewhere else.
148   Args.ClaimAllArgs(options::OPT_w);
149 
150   if (!D.SysRoot.empty())
151     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
152 
153   if (IsPIE)
154     CmdArgs.push_back("-pie");
155 
156   CmdArgs.push_back("--eh-frame-hdr");
157   if (Args.hasArg(options::OPT_static)) {
158     CmdArgs.push_back("-Bstatic");
159   } else {
160     if (Args.hasArg(options::OPT_rdynamic))
161       CmdArgs.push_back("-export-dynamic");
162     if (Args.hasArg(options::OPT_shared)) {
163       CmdArgs.push_back("-shared");
164     } else if (!Args.hasArg(options::OPT_r)) {
165       CmdArgs.push_back("-dynamic-linker");
166       CmdArgs.push_back("/libexec/ld-elf.so.1");
167     }
168     const llvm::Triple &T = ToolChain.getTriple();
169     if (Arch == llvm::Triple::arm || T.isX86())
170       CmdArgs.push_back("--hash-style=both");
171     CmdArgs.push_back("--enable-new-dtags");
172   }
173 
174   // Explicitly set the linker emulation for platforms that might not
175   // be the default emulation for the linker.
176   switch (Arch) {
177   case llvm::Triple::x86:
178     CmdArgs.push_back("-m");
179     CmdArgs.push_back("elf_i386_fbsd");
180     break;
181   case llvm::Triple::ppc:
182     CmdArgs.push_back("-m");
183     CmdArgs.push_back("elf32ppc_fbsd");
184     break;
185   case llvm::Triple::ppcle:
186     CmdArgs.push_back("-m");
187     // Use generic -- only usage is for freestanding.
188     CmdArgs.push_back("elf32lppc");
189     break;
190   case llvm::Triple::mips:
191     CmdArgs.push_back("-m");
192     CmdArgs.push_back("elf32btsmip_fbsd");
193     break;
194   case llvm::Triple::mipsel:
195     CmdArgs.push_back("-m");
196     CmdArgs.push_back("elf32ltsmip_fbsd");
197     break;
198   case llvm::Triple::mips64:
199     CmdArgs.push_back("-m");
200     if (tools::mips::hasMipsAbiArg(Args, "n32"))
201       CmdArgs.push_back("elf32btsmipn32_fbsd");
202     else
203       CmdArgs.push_back("elf64btsmip_fbsd");
204     break;
205   case llvm::Triple::mips64el:
206     CmdArgs.push_back("-m");
207     if (tools::mips::hasMipsAbiArg(Args, "n32"))
208       CmdArgs.push_back("elf32ltsmipn32_fbsd");
209     else
210       CmdArgs.push_back("elf64ltsmip_fbsd");
211     break;
212   case llvm::Triple::riscv64:
213     CmdArgs.push_back("-m");
214     CmdArgs.push_back("elf64lriscv");
215     CmdArgs.push_back("-X");
216     break;
217   default:
218     break;
219   }
220 
221   if (Arg *A = Args.getLastArg(options::OPT_G)) {
222     if (ToolChain.getTriple().isMIPS()) {
223       StringRef v = A->getValue();
224       CmdArgs.push_back(Args.MakeArgString("-G" + v));
225       A->claim();
226     }
227   }
228 
229   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
230   if (Output.isFilename()) {
231     CmdArgs.push_back("-o");
232     CmdArgs.push_back(Output.getFilename());
233   }
234 
235   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
236                    options::OPT_r)) {
237     const char *crt1 = nullptr;
238     if (!Args.hasArg(options::OPT_shared)) {
239       if (Args.hasArg(options::OPT_pg))
240         crt1 = "gcrt1.o";
241       else if (IsPIE)
242         crt1 = "Scrt1.o";
243       else
244         crt1 = "crt1.o";
245     }
246     if (crt1)
247       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
248 
249     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
250 
251     const char *crtbegin = nullptr;
252     if (Args.hasArg(options::OPT_static))
253       crtbegin = "crtbeginT.o";
254     else if (Args.hasArg(options::OPT_shared) || IsPIE)
255       crtbegin = "crtbeginS.o";
256     else
257       crtbegin = "crtbegin.o";
258 
259     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
260   }
261 
262   Args.AddAllArgs(CmdArgs, options::OPT_L);
263   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
264   Args.addAllArgs(CmdArgs, {options::OPT_T_Group, options::OPT_s,
265                             options::OPT_t, options::OPT_r});
266 
267   if (D.isUsingLTO()) {
268     assert(!Inputs.empty() && "Must have at least one input.");
269     // Find the first filename InputInfo object.
270     auto Input = llvm::find_if(
271         Inputs, [](const InputInfo &II) -> bool { return II.isFilename(); });
272     if (Input == Inputs.end())
273       // For a very rare case, all of the inputs to the linker are
274       // InputArg. If that happens, just use the first InputInfo.
275       Input = Inputs.begin();
276 
277     addLTOOptions(ToolChain, Args, CmdArgs, Output, *Input,
278                   D.getLTOMode() == LTOK_Thin);
279   }
280 
281   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
282   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
283   addLinkerCompressDebugSectionsOption(ToolChain, Args, CmdArgs);
284   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
285 
286   unsigned Major = ToolChain.getTriple().getOSMajorVersion();
287   bool Profiling = Args.hasArg(options::OPT_pg) && Major != 0 && Major < 14;
288   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
289                    options::OPT_r)) {
290     // Use the static OpenMP runtime with -static-openmp
291     bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
292                         !Args.hasArg(options::OPT_static);
293     addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP);
294 
295     if (D.CCCIsCXX()) {
296       if (ToolChain.ShouldLinkCXXStdlib(Args))
297         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
298       if (Profiling)
299         CmdArgs.push_back("-lm_p");
300       else
301         CmdArgs.push_back("-lm");
302     }
303 
304     // Silence warnings when linking C code with a C++ '-stdlib' argument.
305     Args.ClaimAllArgs(options::OPT_stdlib_EQ);
306 
307     // Additional linker set-up and flags for Fortran. This is required in order
308     // to generate executables. As Fortran runtime depends on the C runtime,
309     // these dependencies need to be listed before the C runtime below (i.e.
310     // AddRunTimeLibs).
311     if (D.IsFlangMode()) {
312       addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
313       addFortranRuntimeLibs(ToolChain, Args, CmdArgs);
314       if (Profiling)
315         CmdArgs.push_back("-lm_p");
316       else
317         CmdArgs.push_back("-lm");
318     }
319 
320     if (NeedsSanitizerDeps)
321       linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);
322     if (NeedsXRayDeps)
323       linkXRayRuntimeDeps(ToolChain, Args, CmdArgs);
324     // FIXME: For some reason GCC passes -lgcc and -lgcc_s before adding
325     // the default system libraries. Just mimic this for now.
326     if (Profiling)
327       CmdArgs.push_back("-lgcc_p");
328     else
329       CmdArgs.push_back("-lgcc");
330     if (Args.hasArg(options::OPT_static)) {
331       CmdArgs.push_back("-lgcc_eh");
332     } else if (Profiling) {
333       CmdArgs.push_back("-lgcc_eh_p");
334     } else {
335       CmdArgs.push_back("--as-needed");
336       CmdArgs.push_back("-lgcc_s");
337       CmdArgs.push_back("--no-as-needed");
338     }
339 
340     if (Args.hasArg(options::OPT_pthread)) {
341       if (Profiling)
342         CmdArgs.push_back("-lpthread_p");
343       else
344         CmdArgs.push_back("-lpthread");
345     }
346 
347     if (Profiling) {
348       if (Args.hasArg(options::OPT_shared))
349         CmdArgs.push_back("-lc");
350       else
351         CmdArgs.push_back("-lc_p");
352       CmdArgs.push_back("-lgcc_p");
353     } else {
354       CmdArgs.push_back("-lc");
355       CmdArgs.push_back("-lgcc");
356     }
357 
358     if (Args.hasArg(options::OPT_static)) {
359       CmdArgs.push_back("-lgcc_eh");
360     } else if (Profiling) {
361       CmdArgs.push_back("-lgcc_eh_p");
362     } else {
363       CmdArgs.push_back("--as-needed");
364       CmdArgs.push_back("-lgcc_s");
365       CmdArgs.push_back("--no-as-needed");
366     }
367   }
368 
369   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
370                    options::OPT_r)) {
371     const char *crtend = nullptr;
372     if (Args.hasArg(options::OPT_shared) || IsPIE)
373       crtend = "crtendS.o";
374     else
375       crtend = "crtend.o";
376     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
377     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
378   }
379 
380   ToolChain.addProfileRTLibs(Args, CmdArgs);
381 
382   const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
383   C.addCommand(std::make_unique<Command>(JA, *this,
384                                          ResponseFileSupport::AtFileCurCP(),
385                                          Exec, CmdArgs, Inputs, Output));
386 }
387 
388 /// FreeBSD - FreeBSD tool chain which can call as(1) and ld(1) directly.
389 
FreeBSD(const Driver & D,const llvm::Triple & Triple,const ArgList & Args)390 FreeBSD::FreeBSD(const Driver &D, const llvm::Triple &Triple,
391                  const ArgList &Args)
392     : Generic_ELF(D, Triple, Args) {
393 
394   // When targeting 32-bit platforms, look for '/usr/lib32/crt1.o' and fall
395   // back to '/usr/lib' if it doesn't exist.
396   if (Triple.isArch32Bit() &&
397       D.getVFS().exists(concat(getDriver().SysRoot, "/usr/lib32/crt1.o")))
398     getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib32"));
399   else
400     getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib"));
401 }
402 
AddClangSystemIncludeArgs(const llvm::opt::ArgList & DriverArgs,llvm::opt::ArgStringList & CC1Args) const403 void FreeBSD::AddClangSystemIncludeArgs(
404     const llvm::opt::ArgList &DriverArgs,
405     llvm::opt::ArgStringList &CC1Args) const {
406   const Driver &D = getDriver();
407 
408   if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
409     return;
410 
411   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
412     SmallString<128> Dir(D.ResourceDir);
413     llvm::sys::path::append(Dir, "include");
414     addSystemInclude(DriverArgs, CC1Args, Dir.str());
415   }
416 
417   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
418     return;
419 
420   // Check for configure-time C include directories.
421   StringRef CIncludeDirs(C_INCLUDE_DIRS);
422   if (CIncludeDirs != "") {
423     SmallVector<StringRef, 5> dirs;
424     CIncludeDirs.split(dirs, ":");
425     for (StringRef dir : dirs) {
426       StringRef Prefix =
427           llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
428       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
429     }
430     return;
431   }
432 
433   addExternCSystemInclude(DriverArgs, CC1Args,
434                           concat(D.SysRoot, "/usr/include"));
435 }
436 
addLibCxxIncludePaths(const llvm::opt::ArgList & DriverArgs,llvm::opt::ArgStringList & CC1Args) const437 void FreeBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
438                                     llvm::opt::ArgStringList &CC1Args) const {
439   addSystemInclude(DriverArgs, CC1Args,
440                    concat(getDriver().SysRoot, "/usr/include/c++/v1"));
441 }
442 
AddCXXStdlibLibArgs(const ArgList & Args,ArgStringList & CmdArgs) const443 void FreeBSD::AddCXXStdlibLibArgs(const ArgList &Args,
444                                   ArgStringList &CmdArgs) const {
445   unsigned Major = getTriple().getOSMajorVersion();
446   bool Profiling = Args.hasArg(options::OPT_pg) && Major != 0 && Major < 14;
447 
448   CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
449   if (Args.hasArg(options::OPT_fexperimental_library))
450     CmdArgs.push_back("-lc++experimental");
451 }
452 
AddCudaIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const453 void FreeBSD::AddCudaIncludeArgs(const ArgList &DriverArgs,
454                                  ArgStringList &CC1Args) const {
455   CudaInstallation->AddCudaIncludeArgs(DriverArgs, CC1Args);
456 }
457 
AddHIPIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const458 void FreeBSD::AddHIPIncludeArgs(const ArgList &DriverArgs,
459                                 ArgStringList &CC1Args) const {
460   RocmInstallation->AddHIPIncludeArgs(DriverArgs, CC1Args);
461 }
462 
buildAssembler() const463 Tool *FreeBSD::buildAssembler() const {
464   return new tools::freebsd::Assembler(*this);
465 }
466 
buildLinker() const467 Tool *FreeBSD::buildLinker() const { return new tools::freebsd::Linker(*this); }
468 
HasNativeLLVMSupport() const469 bool FreeBSD::HasNativeLLVMSupport() const { return true; }
470 
471 ToolChain::UnwindTableLevel
getDefaultUnwindTableLevel(const ArgList & Args) const472 FreeBSD::getDefaultUnwindTableLevel(const ArgList &Args) const {
473   return UnwindTableLevel::Asynchronous;
474 }
475 
isPIEDefault(const llvm::opt::ArgList & Args) const476 bool FreeBSD::isPIEDefault(const llvm::opt::ArgList &Args) const {
477   return getSanitizerArgs(Args).requiresPIE();
478 }
479 
getSupportedSanitizers() const480 SanitizerMask FreeBSD::getSupportedSanitizers() const {
481   const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64;
482   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
483   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
484   const bool IsMIPS64 = getTriple().isMIPS64();
485   SanitizerMask Res = ToolChain::getSupportedSanitizers();
486   Res |= SanitizerKind::Address;
487   Res |= SanitizerKind::PointerCompare;
488   Res |= SanitizerKind::PointerSubtract;
489   Res |= SanitizerKind::Vptr;
490   if (IsAArch64 || IsX86_64 || IsMIPS64) {
491     Res |= SanitizerKind::Leak;
492     Res |= SanitizerKind::Thread;
493   }
494   if (IsAArch64 || IsX86 || IsX86_64) {
495     Res |= SanitizerKind::SafeStack;
496     Res |= SanitizerKind::Fuzzer;
497     Res |= SanitizerKind::FuzzerNoLink;
498   }
499   if (IsAArch64 || IsX86_64) {
500     Res |= SanitizerKind::KernelAddress;
501     Res |= SanitizerKind::KernelMemory;
502     Res |= SanitizerKind::Memory;
503   }
504   return Res;
505 }
506