xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/OpenBSD.cpp (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5)
1 //===--- OpenBSD.cpp - OpenBSD 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 "OpenBSD.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/Options.h"
17 #include "clang/Driver/SanitizerArgs.h"
18 #include "llvm/Option/ArgList.h"
19 #include "llvm/Support/Path.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 
28 void openbsd::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 toolchains::OpenBSD &ToolChain =
34       static_cast<const toolchains::OpenBSD &>(getToolChain());
35   const Driver &D = ToolChain.getDriver();
36   const llvm::Triple &Triple = ToolChain.getTriple();
37 
38   claimNoWarnArgs(Args);
39   ArgStringList CmdArgs;
40 
41   switch (ToolChain.getArch()) {
42   case llvm::Triple::x86:
43     // When building 32-bit code on OpenBSD/amd64, we have to explicitly
44     // instruct as in the base system to assemble 32-bit code.
45     CmdArgs.push_back("--32");
46     break;
47 
48   case llvm::Triple::arm:
49   case llvm::Triple::armeb: {
50     StringRef MArch, MCPU;
51     arm::getARMArchCPUFromArgs(Args, MArch, MCPU, /*FromAs*/ true);
52     std::string Arch = arm::getARMTargetCPU(MCPU, MArch, Triple);
53     CmdArgs.push_back(Args.MakeArgString("-mcpu=" + Arch));
54     break;
55   }
56 
57   case llvm::Triple::ppc:
58     CmdArgs.push_back("-mppc");
59     CmdArgs.push_back("-many");
60     break;
61 
62   case llvm::Triple::sparcv9: {
63     CmdArgs.push_back("-64");
64     std::string CPU = getCPUName(D, Args, Triple);
65     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, Triple));
66     AddAssemblerKPIC(ToolChain, Args, CmdArgs);
67     break;
68   }
69 
70   case llvm::Triple::mips64:
71   case llvm::Triple::mips64el: {
72     StringRef CPUName;
73     StringRef ABIName;
74     mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
75 
76     CmdArgs.push_back("-march");
77     CmdArgs.push_back(CPUName.data());
78 
79     CmdArgs.push_back("-mabi");
80     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
81 
82     if (Triple.isLittleEndian())
83       CmdArgs.push_back("-EL");
84     else
85       CmdArgs.push_back("-EB");
86 
87     AddAssemblerKPIC(ToolChain, Args, CmdArgs);
88     break;
89   }
90 
91   default:
92     break;
93   }
94 
95   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
96 
97   CmdArgs.push_back("-o");
98   CmdArgs.push_back(Output.getFilename());
99 
100   for (const auto &II : Inputs)
101     CmdArgs.push_back(II.getFilename());
102 
103   const char *Exec = Args.MakeArgString(ToolChain.GetProgramPath("as"));
104   C.addCommand(std::make_unique<Command>(JA, *this,
105                                          ResponseFileSupport::AtFileCurCP(),
106                                          Exec, CmdArgs, Inputs, Output));
107 }
108 
109 void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
110                                    const InputInfo &Output,
111                                    const InputInfoList &Inputs,
112                                    const ArgList &Args,
113                                    const char *LinkingOutput) const {
114   const toolchains::OpenBSD &ToolChain =
115       static_cast<const toolchains::OpenBSD &>(getToolChain());
116   const Driver &D = ToolChain.getDriver();
117   const llvm::Triple::ArchType Arch = ToolChain.getArch();
118   ArgStringList CmdArgs;
119 
120   // Silence warning for "clang -g foo.o -o foo"
121   Args.ClaimAllArgs(options::OPT_g_Group);
122   // and "clang -emit-llvm foo.o -o foo"
123   Args.ClaimAllArgs(options::OPT_emit_llvm);
124   // and for "clang -w foo.o -o foo". Other warning options are already
125   // handled somewhere else.
126   Args.ClaimAllArgs(options::OPT_w);
127 
128   if (!D.SysRoot.empty())
129     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
130 
131   if (Arch == llvm::Triple::mips64)
132     CmdArgs.push_back("-EB");
133   else if (Arch == llvm::Triple::mips64el)
134     CmdArgs.push_back("-EL");
135 
136   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared)) {
137     CmdArgs.push_back("-e");
138     CmdArgs.push_back("__start");
139   }
140 
141   CmdArgs.push_back("--eh-frame-hdr");
142   if (Args.hasArg(options::OPT_static)) {
143     CmdArgs.push_back("-Bstatic");
144   } else {
145     if (Args.hasArg(options::OPT_rdynamic))
146       CmdArgs.push_back("-export-dynamic");
147     CmdArgs.push_back("-Bdynamic");
148     if (Args.hasArg(options::OPT_shared)) {
149       CmdArgs.push_back("-shared");
150     } else if (!Args.hasArg(options::OPT_r)) {
151       CmdArgs.push_back("-dynamic-linker");
152       CmdArgs.push_back("/usr/libexec/ld.so");
153     }
154   }
155 
156   if (Args.hasArg(options::OPT_pie))
157     CmdArgs.push_back("-pie");
158   if (Args.hasArg(options::OPT_nopie) || Args.hasArg(options::OPT_pg))
159     CmdArgs.push_back("-nopie");
160 
161   if (Arch == llvm::Triple::riscv64)
162     CmdArgs.push_back("-X");
163 
164   if (Output.isFilename()) {
165     CmdArgs.push_back("-o");
166     CmdArgs.push_back(Output.getFilename());
167   } else {
168     assert(Output.isNothing() && "Invalid output.");
169   }
170 
171   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
172                    options::OPT_r)) {
173     const char *crt0 = nullptr;
174     const char *crtbegin = nullptr;
175     if (!Args.hasArg(options::OPT_shared)) {
176       if (Args.hasArg(options::OPT_pg))
177         crt0 = "gcrt0.o";
178       else if (Args.hasArg(options::OPT_static) &&
179                !Args.hasArg(options::OPT_nopie))
180         crt0 = "rcrt0.o";
181       else
182         crt0 = "crt0.o";
183       crtbegin = "crtbegin.o";
184     } else {
185       crtbegin = "crtbeginS.o";
186     }
187 
188     if (crt0)
189       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt0)));
190     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
191   }
192 
193   Args.AddAllArgs(CmdArgs, options::OPT_L);
194   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
195   Args.AddAllArgs(CmdArgs, {options::OPT_T_Group, options::OPT_e,
196                             options::OPT_s, options::OPT_t,
197                             options::OPT_Z_Flag, options::OPT_r});
198 
199   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
200   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
201   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
202 
203   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
204                    options::OPT_r)) {
205     // Use the static OpenMP runtime with -static-openmp
206     bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
207                         !Args.hasArg(options::OPT_static);
208     addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP);
209 
210     if (D.CCCIsCXX()) {
211       if (ToolChain.ShouldLinkCXXStdlib(Args))
212         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
213       if (Args.hasArg(options::OPT_pg))
214         CmdArgs.push_back("-lm_p");
215       else
216         CmdArgs.push_back("-lm");
217     }
218     if (NeedsSanitizerDeps) {
219       CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
220       linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
221     }
222     if (NeedsXRayDeps) {
223       CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
224       linkXRayRuntimeDeps(ToolChain, CmdArgs);
225     }
226     // FIXME: For some reason GCC passes -lgcc before adding
227     // the default system libraries. Just mimic this for now.
228     CmdArgs.push_back("-lcompiler_rt");
229 
230     if (Args.hasArg(options::OPT_pthread)) {
231       if (!Args.hasArg(options::OPT_shared) && Args.hasArg(options::OPT_pg))
232         CmdArgs.push_back("-lpthread_p");
233       else
234         CmdArgs.push_back("-lpthread");
235     }
236 
237     if (!Args.hasArg(options::OPT_shared)) {
238       if (Args.hasArg(options::OPT_pg))
239         CmdArgs.push_back("-lc_p");
240       else
241         CmdArgs.push_back("-lc");
242     }
243 
244     CmdArgs.push_back("-lcompiler_rt");
245   }
246 
247   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
248                    options::OPT_r)) {
249     const char *crtend = nullptr;
250     if (!Args.hasArg(options::OPT_shared))
251       crtend = "crtend.o";
252     else
253       crtend = "crtendS.o";
254 
255     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
256   }
257 
258   ToolChain.addProfileRTLibs(Args, CmdArgs);
259 
260   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
261   C.addCommand(std::make_unique<Command>(JA, *this,
262                                          ResponseFileSupport::AtFileCurCP(),
263                                          Exec, CmdArgs, Inputs, Output));
264 }
265 
266 SanitizerMask OpenBSD::getSupportedSanitizers() const {
267   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
268   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
269 
270   // For future use, only UBsan at the moment
271   SanitizerMask Res = ToolChain::getSupportedSanitizers();
272 
273   if (IsX86 || IsX86_64) {
274     Res |= SanitizerKind::Vptr;
275     Res |= SanitizerKind::Fuzzer;
276     Res |= SanitizerKind::FuzzerNoLink;
277   }
278 
279   return Res;
280 }
281 
282 /// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.
283 
284 OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,
285                  const ArgList &Args)
286     : Generic_ELF(D, Triple, Args) {
287   getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib"));
288 }
289 
290 void OpenBSD::AddClangSystemIncludeArgs(
291     const llvm::opt::ArgList &DriverArgs,
292     llvm::opt::ArgStringList &CC1Args) const {
293   const Driver &D = getDriver();
294 
295   if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
296     return;
297 
298   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
299     SmallString<128> Dir(D.ResourceDir);
300     llvm::sys::path::append(Dir, "include");
301     addSystemInclude(DriverArgs, CC1Args, Dir.str());
302   }
303 
304   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
305     return;
306 
307   // Check for configure-time C include directories.
308   StringRef CIncludeDirs(C_INCLUDE_DIRS);
309   if (CIncludeDirs != "") {
310     SmallVector<StringRef, 5> dirs;
311     CIncludeDirs.split(dirs, ":");
312     for (StringRef dir : dirs) {
313       StringRef Prefix =
314           llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
315       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
316     }
317     return;
318   }
319 
320   addExternCSystemInclude(DriverArgs, CC1Args,
321                           concat(D.SysRoot, "/usr/include"));
322 }
323 
324 void OpenBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
325                                     llvm::opt::ArgStringList &CC1Args) const {
326   addSystemInclude(DriverArgs, CC1Args,
327                    concat(getDriver().SysRoot, "/usr/include/c++/v1"));
328 }
329 
330 void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args,
331                                   ArgStringList &CmdArgs) const {
332   bool Profiling = Args.hasArg(options::OPT_pg);
333 
334   CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
335   if (Args.hasArg(options::OPT_fexperimental_library))
336     CmdArgs.push_back("-lc++experimental");
337   CmdArgs.push_back(Profiling ? "-lc++abi_p" : "-lc++abi");
338   CmdArgs.push_back(Profiling ? "-lpthread_p" : "-lpthread");
339 }
340 
341 std::string OpenBSD::getCompilerRT(const ArgList &Args, StringRef Component,
342                                    FileType Type) const {
343   if (Component == "builtins") {
344     SmallString<128> Path(getDriver().SysRoot);
345     llvm::sys::path::append(Path, "/usr/lib/libcompiler_rt.a");
346     return std::string(Path.str());
347   }
348   SmallString<128> P(getDriver().ResourceDir);
349   std::string CRTBasename =
350       buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/false);
351   llvm::sys::path::append(P, "lib", CRTBasename);
352   // Checks if this is the base system case which uses a different location.
353   if (getVFS().exists(P))
354     return std::string(P.str());
355   return ToolChain::getCompilerRT(Args, Component, Type);
356 }
357 
358 Tool *OpenBSD::buildAssembler() const {
359   return new tools::openbsd::Assembler(*this);
360 }
361 
362 Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }
363 
364 bool OpenBSD::HasNativeLLVMSupport() const { return true; }
365 
366 bool OpenBSD::IsUnwindTablesDefault(const ArgList &Args) const {
367     switch (getArch()) {
368       case llvm::Triple::arm:
369         return false;
370       default:
371         return true;
372     }
373 }
374