399 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9#include "OpenBSD.h"10#include "Arch/ARM.h"11#include "Arch/Mips.h"12#include "Arch/Sparc.h"13#include "clang/Config/config.h"14#include "clang/Driver/CommonArgs.h"15#include "clang/Driver/Compilation.h"16#include "clang/Driver/SanitizerArgs.h"17#include "clang/Options/Options.h"18#include "llvm/Option/ArgList.h"19#include "llvm/Support/Path.h"20#include "llvm/Support/VirtualFileSystem.h"21 22using namespace clang::driver;23using namespace clang::driver::tools;24using namespace clang::driver::toolchains;25using namespace clang;26using namespace llvm::opt;27 28void 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 auto &ToolChain = static_cast<const OpenBSD &>(getToolChain());34 const Driver &D = ToolChain.getDriver();35 const llvm::Triple &Triple = ToolChain.getTriple();36 ArgStringList CmdArgs;37 38 claimNoWarnArgs(Args);39 40 switch (ToolChain.getArch()) {41 case llvm::Triple::x86:42 // When building 32-bit code on OpenBSD/amd64, we have to explicitly43 // instruct as in the base system to assemble 32-bit code.44 CmdArgs.push_back("--32");45 break;46 47 case llvm::Triple::arm: {48 StringRef MArch, MCPU;49 arm::getARMArchCPUFromArgs(Args, MArch, MCPU, /*FromAs*/ true);50 std::string Arch = arm::getARMTargetCPU(MCPU, MArch, Triple);51 CmdArgs.push_back(Args.MakeArgString("-mcpu=" + Arch));52 break;53 }54 55 case llvm::Triple::ppc:56 CmdArgs.push_back("-mppc");57 CmdArgs.push_back("-many");58 break;59 60 case llvm::Triple::sparcv9: {61 CmdArgs.push_back("-64");62 std::string CPU = getCPUName(D, Args, Triple);63 CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, Triple));64 AddAssemblerKPIC(ToolChain, Args, CmdArgs);65 break;66 }67 68 case llvm::Triple::mips64:69 case llvm::Triple::mips64el: {70 StringRef CPUName;71 StringRef ABIName;72 mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);73 74 CmdArgs.push_back("-march");75 CmdArgs.push_back(CPUName.data());76 77 CmdArgs.push_back("-mabi");78 CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());79 80 if (Triple.isLittleEndian())81 CmdArgs.push_back("-EL");82 else83 CmdArgs.push_back("-EB");84 85 AddAssemblerKPIC(ToolChain, Args, CmdArgs);86 break;87 }88 89 default:90 break;91 }92 93 Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);94 95 CmdArgs.push_back("-o");96 CmdArgs.push_back(Output.getFilename());97 98 for (const auto &II : Inputs)99 CmdArgs.push_back(II.getFilename());100 101 const char *Exec = Args.MakeArgString(ToolChain.GetProgramPath("as"));102 C.addCommand(std::make_unique<Command>(JA, *this,103 ResponseFileSupport::AtFileCurCP(),104 Exec, CmdArgs, Inputs, Output));105}106 107void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,108 const InputInfo &Output,109 const InputInfoList &Inputs,110 const ArgList &Args,111 const char *LinkingOutput) const {112 const auto &ToolChain = static_cast<const OpenBSD &>(getToolChain());113 const Driver &D = ToolChain.getDriver();114 const llvm::Triple &Triple = ToolChain.getTriple();115 const llvm::Triple::ArchType Arch = ToolChain.getArch();116 const bool Static = Args.hasArg(options::OPT_static);117 const bool Shared = Args.hasArg(options::OPT_shared);118 const bool Profiling = Args.hasArg(options::OPT_pg);119 const bool Pie = Args.hasArg(options::OPT_pie);120 const bool Nopie = Args.hasArg(options::OPT_no_pie, options::OPT_nopie);121 const bool Relocatable = Args.hasArg(options::OPT_r);122 ArgStringList CmdArgs;123 124 // Silence warning for "clang -g foo.o -o foo"125 Args.ClaimAllArgs(options::OPT_g_Group);126 // and "clang -emit-llvm foo.o -o foo"127 Args.ClaimAllArgs(options::OPT_emit_llvm);128 // and for "clang -w foo.o -o foo". Other warning options are already129 // handled somewhere else.130 Args.ClaimAllArgs(options::OPT_w);131 132 if (!D.SysRoot.empty())133 CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));134 135 if (Arch == llvm::Triple::mips64)136 CmdArgs.push_back("-EB");137 else if (Arch == llvm::Triple::mips64el)138 CmdArgs.push_back("-EL");139 140 if (!Args.hasArg(options::OPT_nostdlib) && !Shared && !Relocatable) {141 CmdArgs.push_back("-e");142 CmdArgs.push_back("__start");143 }144 145 CmdArgs.push_back("--eh-frame-hdr");146 if (Static) {147 CmdArgs.push_back("-Bstatic");148 } else {149 if (Args.hasArg(options::OPT_rdynamic))150 CmdArgs.push_back("-export-dynamic");151 if (Shared) {152 CmdArgs.push_back("-shared");153 } else if (!Relocatable) {154 CmdArgs.push_back("-dynamic-linker");155 CmdArgs.push_back("/usr/libexec/ld.so");156 }157 }158 159 if (Pie)160 CmdArgs.push_back("-pie");161 if (Nopie || Profiling)162 CmdArgs.push_back("-nopie");163 164 if (Triple.isLoongArch64() || Triple.isRISCV64()) {165 CmdArgs.push_back("-X");166 if (Args.hasArg(options::OPT_mno_relax))167 CmdArgs.push_back("--no-relax");168 }169 170 assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");171 if (Output.isFilename()) {172 CmdArgs.push_back("-o");173 CmdArgs.push_back(Output.getFilename());174 }175 176 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,177 options::OPT_r)) {178 const char *crt0 = nullptr;179 const char *crtbegin = nullptr;180 if (!Shared) {181 if (Profiling)182 crt0 = "gcrt0.o";183 else if (Static && !Nopie)184 crt0 = "rcrt0.o";185 else186 crt0 = "crt0.o";187 crtbegin = "crtbegin.o";188 } else {189 crtbegin = "crtbeginS.o";190 }191 192 if (crt0)193 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt0)));194 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));195 }196 197 Args.AddAllArgs(CmdArgs, options::OPT_L);198 ToolChain.AddFilePathLibArgs(Args, CmdArgs);199 Args.addAllArgs(CmdArgs,200 {options::OPT_T_Group, options::OPT_s, options::OPT_t});201 202 if (D.isUsingLTO())203 addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs,204 D.getLTOMode() == LTOK_Thin);205 206 bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);207 bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);208 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);209 210 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,211 options::OPT_r)) {212 // Use the static OpenMP runtime with -static-openmp213 bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) && !Static;214 addOpenMPRuntime(C, CmdArgs, ToolChain, Args, StaticOpenMP);215 216 if (D.CCCIsCXX()) {217 if (ToolChain.ShouldLinkCXXStdlib(Args))218 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);219 if (Profiling)220 CmdArgs.push_back("-lm_p");221 else222 CmdArgs.push_back("-lm");223 }224 225 // Silence warnings when linking C code with a C++ '-stdlib' argument.226 Args.ClaimAllArgs(options::OPT_stdlib_EQ);227 228 // Additional linker set-up and flags for Fortran. This is required in order229 // to generate executables. As Fortran runtime depends on the C runtime,230 // these dependencies need to be listed before the C runtime below (i.e.231 // AddRunTimeLibs).232 if (D.IsFlangMode() &&233 !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {234 ToolChain.addFortranRuntimeLibraryPath(Args, CmdArgs);235 ToolChain.addFortranRuntimeLibs(Args, CmdArgs);236 if (Profiling)237 CmdArgs.push_back("-lm_p");238 else239 CmdArgs.push_back("-lm");240 }241 242 if (NeedsSanitizerDeps) {243 CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));244 linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);245 }246 if (NeedsXRayDeps) {247 CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));248 linkXRayRuntimeDeps(ToolChain, Args, CmdArgs);249 }250 // FIXME: For some reason GCC passes -lgcc before adding251 // the default system libraries. Just mimic this for now.252 CmdArgs.push_back("-lcompiler_rt");253 254 if (Args.hasArg(options::OPT_pthread)) {255 if (!Shared && Profiling)256 CmdArgs.push_back("-lpthread_p");257 else258 CmdArgs.push_back("-lpthread");259 }260 261 if (!Shared) {262 if (Profiling)263 CmdArgs.push_back("-lc_p");264 else265 CmdArgs.push_back("-lc");266 }267 268 CmdArgs.push_back("-lcompiler_rt");269 }270 271 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,272 options::OPT_r)) {273 const char *crtend = nullptr;274 if (!Shared)275 crtend = "crtend.o";276 else277 crtend = "crtendS.o";278 279 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));280 }281 282 ToolChain.addProfileRTLibs(Args, CmdArgs);283 284 const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());285 C.addCommand(std::make_unique<Command>(JA, *this,286 ResponseFileSupport::AtFileCurCP(),287 Exec, CmdArgs, Inputs, Output));288}289 290SanitizerMask OpenBSD::getSupportedSanitizers() const {291 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;292 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;293 SanitizerMask Res = ToolChain::getSupportedSanitizers();294 if (IsX86 || IsX86_64) {295 Res |= SanitizerKind::Vptr;296 Res |= SanitizerKind::Fuzzer;297 Res |= SanitizerKind::FuzzerNoLink;298 }299 if (IsX86_64) {300 Res |= SanitizerKind::KernelAddress;301 }302 return Res;303}304 305/// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.306 307OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,308 const ArgList &Args)309 : Generic_ELF(D, Triple, Args) {310 getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib"));311}312 313void OpenBSD::AddClangSystemIncludeArgs(314 const llvm::opt::ArgList &DriverArgs,315 llvm::opt::ArgStringList &CC1Args) const {316 const Driver &D = getDriver();317 318 if (DriverArgs.hasArg(options::OPT_nostdinc))319 return;320 321 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {322 SmallString<128> Dir(D.ResourceDir);323 llvm::sys::path::append(Dir, "include");324 addSystemInclude(DriverArgs, CC1Args, Dir.str());325 }326 327 if (DriverArgs.hasArg(options::OPT_nostdlibinc))328 return;329 330 // Check for configure-time C include directories.331 StringRef CIncludeDirs(C_INCLUDE_DIRS);332 if (CIncludeDirs != "") {333 SmallVector<StringRef, 5> dirs;334 CIncludeDirs.split(dirs, ":");335 for (StringRef dir : dirs) {336 StringRef Prefix =337 llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";338 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);339 }340 return;341 }342 343 addExternCSystemInclude(DriverArgs, CC1Args,344 concat(D.SysRoot, "/usr/include"));345}346 347void OpenBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,348 llvm::opt::ArgStringList &CC1Args) const {349 addSystemInclude(DriverArgs, CC1Args,350 concat(getDriver().SysRoot, "/usr/include/c++/v1"));351}352 353void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args,354 ArgStringList &CmdArgs) const {355 bool Profiling = Args.hasArg(options::OPT_pg);356 357 CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");358 if (Args.hasArg(options::OPT_fexperimental_library))359 CmdArgs.push_back("-lc++experimental");360 CmdArgs.push_back(Profiling ? "-lc++abi_p" : "-lc++abi");361 CmdArgs.push_back(Profiling ? "-lpthread_p" : "-lpthread");362}363 364std::string OpenBSD::getCompilerRT(const ArgList &Args, StringRef Component,365 FileType Type, bool IsFortran) const {366 if (Component == "builtins") {367 SmallString<128> Path(getDriver().SysRoot);368 llvm::sys::path::append(Path, "/usr/lib/libcompiler_rt.a");369 if (getVFS().exists(Path))370 return std::string(Path);371 }372 SmallString<128> P(getDriver().ResourceDir);373 std::string CRTBasename = buildCompilerRTBasename(374 Args, Component, Type, /*AddArch=*/false, IsFortran);375 llvm::sys::path::append(P, "lib", CRTBasename);376 // Checks if this is the base system case which uses a different location.377 if (getVFS().exists(P))378 return std::string(P);379 return ToolChain::getCompilerRT(Args, Component, Type, IsFortran);380}381 382Tool *OpenBSD::buildAssembler() const {383 return new tools::openbsd::Assembler(*this);384}385 386Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }387 388bool OpenBSD::HasNativeLLVMSupport() const { return true; }389 390ToolChain::UnwindTableLevel391OpenBSD::getDefaultUnwindTableLevel(const ArgList &Args) const {392 switch (getArch()) {393 case llvm::Triple::arm:394 return UnwindTableLevel::None;395 default:396 return UnwindTableLevel::Asynchronous;397 }398}399