1 //===--- RISCVToolchain.cpp - RISCV 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 "RISCVToolchain.h" 10 #include "CommonArgs.h" 11 #include "clang/Driver/Compilation.h" 12 #include "clang/Driver/InputInfo.h" 13 #include "clang/Driver/Options.h" 14 #include "llvm/Option/ArgList.h" 15 #include "llvm/Support/FileSystem.h" 16 #include "llvm/Support/Path.h" 17 #include "llvm/Support/raw_ostream.h" 18 19 using namespace clang::driver; 20 using namespace clang::driver::toolchains; 21 using namespace clang::driver::tools; 22 using namespace clang; 23 using namespace llvm::opt; 24 25 static void addMultilibsFilePaths(const Driver &D, const MultilibSet &Multilibs, 26 const Multilib &Multilib, 27 StringRef InstallPath, 28 ToolChain::path_list &Paths) { 29 if (const auto &PathsCallback = Multilibs.filePathsCallback()) 30 for (const auto &Path : PathsCallback(Multilib)) 31 addPathIfExists(D, InstallPath + Path, Paths); 32 } 33 34 // This function tests whether a gcc installation is present either 35 // through gcc-toolchain argument or in the same prefix where clang 36 // is installed. This helps decide whether to instantiate this toolchain 37 // or Baremetal toolchain. 38 bool RISCVToolChain::hasGCCToolchain(const Driver &D, 39 const llvm::opt::ArgList &Args) { 40 if (Args.getLastArg(options::OPT_gcc_toolchain)) 41 return true; 42 43 SmallString<128> GCCDir; 44 llvm::sys::path::append(GCCDir, D.Dir, "..", D.getTargetTriple(), 45 "lib/crt0.o"); 46 return llvm::sys::fs::exists(GCCDir); 47 } 48 49 /// RISCV Toolchain 50 RISCVToolChain::RISCVToolChain(const Driver &D, const llvm::Triple &Triple, 51 const ArgList &Args) 52 : Generic_ELF(D, Triple, Args) { 53 GCCInstallation.init(Triple, Args); 54 if (GCCInstallation.isValid()) { 55 Multilibs = GCCInstallation.getMultilibs(); 56 SelectedMultilib = GCCInstallation.getMultilib(); 57 path_list &Paths = getFilePaths(); 58 // Add toolchain/multilib specific file paths. 59 addMultilibsFilePaths(D, Multilibs, SelectedMultilib, 60 GCCInstallation.getInstallPath(), Paths); 61 getFilePaths().push_back(GCCInstallation.getInstallPath().str()); 62 ToolChain::path_list &PPaths = getProgramPaths(); 63 // Multilib cross-compiler GCC installations put ld in a triple-prefixed 64 // directory off of the parent of the GCC installation. 65 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" + 66 GCCInstallation.getTriple().str() + "/bin") 67 .str()); 68 PPaths.push_back((GCCInstallation.getParentLibPath() + "/../bin").str()); 69 } else { 70 getProgramPaths().push_back(D.Dir); 71 } 72 getFilePaths().push_back(computeSysRoot() + "/lib"); 73 } 74 75 Tool *RISCVToolChain::buildLinker() const { 76 return new tools::RISCV::Linker(*this); 77 } 78 79 ToolChain::RuntimeLibType RISCVToolChain::GetDefaultRuntimeLibType() const { 80 return GCCInstallation.isValid() ? 81 ToolChain::RLT_Libgcc : ToolChain::RLT_CompilerRT; 82 } 83 84 ToolChain::UnwindLibType 85 RISCVToolChain::GetUnwindLibType(const llvm::opt::ArgList &Args) const { 86 return ToolChain::UNW_None; 87 } 88 89 void RISCVToolChain::addClangTargetOptions( 90 const llvm::opt::ArgList &DriverArgs, 91 llvm::opt::ArgStringList &CC1Args, 92 Action::OffloadKind) const { 93 CC1Args.push_back("-nostdsysteminc"); 94 } 95 96 void RISCVToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 97 ArgStringList &CC1Args) const { 98 if (DriverArgs.hasArg(options::OPT_nostdinc)) 99 return; 100 101 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) { 102 SmallString<128> Dir(getDriver().ResourceDir); 103 llvm::sys::path::append(Dir, "include"); 104 addSystemInclude(DriverArgs, CC1Args, Dir.str()); 105 } 106 107 if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) { 108 SmallString<128> Dir(computeSysRoot()); 109 llvm::sys::path::append(Dir, "include"); 110 addSystemInclude(DriverArgs, CC1Args, Dir.str()); 111 } 112 } 113 114 void RISCVToolChain::addLibStdCxxIncludePaths( 115 const llvm::opt::ArgList &DriverArgs, 116 llvm::opt::ArgStringList &CC1Args) const { 117 const GCCVersion &Version = GCCInstallation.getVersion(); 118 StringRef TripleStr = GCCInstallation.getTriple().str(); 119 const Multilib &Multilib = GCCInstallation.getMultilib(); 120 addLibStdCXXIncludePaths(computeSysRoot() + "/include/c++/" + Version.Text, 121 TripleStr, Multilib.includeSuffix(), DriverArgs, 122 CC1Args); 123 } 124 125 std::string RISCVToolChain::computeSysRoot() const { 126 if (!getDriver().SysRoot.empty()) 127 return getDriver().SysRoot; 128 129 SmallString<128> SysRootDir; 130 if (GCCInstallation.isValid()) { 131 StringRef LibDir = GCCInstallation.getParentLibPath(); 132 StringRef TripleStr = GCCInstallation.getTriple().str(); 133 llvm::sys::path::append(SysRootDir, LibDir, "..", TripleStr); 134 } else { 135 // Use the triple as provided to the driver. Unlike the parsed triple 136 // this has not been normalized to always contain every field. 137 llvm::sys::path::append(SysRootDir, getDriver().Dir, "..", 138 getDriver().getTargetTriple()); 139 } 140 141 if (!llvm::sys::fs::exists(SysRootDir)) 142 return std::string(); 143 144 return std::string(SysRootDir.str()); 145 } 146 147 void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA, 148 const InputInfo &Output, 149 const InputInfoList &Inputs, 150 const ArgList &Args, 151 const char *LinkingOutput) const { 152 const ToolChain &ToolChain = getToolChain(); 153 const Driver &D = ToolChain.getDriver(); 154 ArgStringList CmdArgs; 155 156 if (!D.SysRoot.empty()) 157 CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot)); 158 159 bool IsRV64 = ToolChain.getArch() == llvm::Triple::riscv64; 160 CmdArgs.push_back("-m"); 161 if (IsRV64) { 162 CmdArgs.push_back("elf64lriscv"); 163 } else { 164 CmdArgs.push_back("elf32lriscv"); 165 } 166 CmdArgs.push_back("-X"); 167 168 std::string Linker = getToolChain().GetLinkerPath(); 169 170 bool WantCRTs = 171 !Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles); 172 173 const char *crtbegin, *crtend; 174 auto RuntimeLib = ToolChain.GetRuntimeLibType(Args); 175 if (RuntimeLib == ToolChain::RLT_Libgcc) { 176 crtbegin = "crtbegin.o"; 177 crtend = "crtend.o"; 178 } else { 179 assert (RuntimeLib == ToolChain::RLT_CompilerRT); 180 crtbegin = ToolChain.getCompilerRTArgString(Args, "crtbegin", 181 ToolChain::FT_Object); 182 crtend = ToolChain.getCompilerRTArgString(Args, "crtend", 183 ToolChain::FT_Object); 184 } 185 186 if (WantCRTs) { 187 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o"))); 188 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin))); 189 } 190 191 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA); 192 193 Args.AddAllArgs(CmdArgs, options::OPT_L); 194 Args.AddAllArgs(CmdArgs, options::OPT_u); 195 ToolChain.AddFilePathLibArgs(Args, CmdArgs); 196 Args.AddAllArgs(CmdArgs, 197 {options::OPT_T_Group, options::OPT_e, options::OPT_s, 198 options::OPT_t, options::OPT_Z_Flag, options::OPT_r}); 199 200 // TODO: add C++ includes and libs if compiling C++. 201 202 if (!Args.hasArg(options::OPT_nostdlib) && 203 !Args.hasArg(options::OPT_nodefaultlibs)) { 204 if (D.CCCIsCXX()) { 205 if (ToolChain.ShouldLinkCXXStdlib(Args)) 206 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs); 207 CmdArgs.push_back("-lm"); 208 } 209 CmdArgs.push_back("--start-group"); 210 CmdArgs.push_back("-lc"); 211 CmdArgs.push_back("-lgloss"); 212 CmdArgs.push_back("--end-group"); 213 AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args); 214 } 215 216 if (WantCRTs) 217 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend))); 218 219 CmdArgs.push_back("-o"); 220 CmdArgs.push_back(Output.getFilename()); 221 C.addCommand(std::make_unique<Command>( 222 JA, *this, ResponseFileSupport::AtFileCurCP(), Args.MakeArgString(Linker), 223 CmdArgs, Inputs, Output)); 224 } 225 // RISCV tools end. 226