contrib/llvm/tools/clang/lib/Driver/ToolChains/RISCVToolchain.cpp

   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 "InputInfo.h"
  12 #include "clang/Driver/Compilation.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 /// RISCV Toolchain
  26 RISCVToolChain::RISCVToolChain(const Driver &D, const llvm::Triple &Triple,
  27                                const ArgList &Args)
  28     : Generic_ELF(D, Triple, Args) {
  29   GCCInstallation.init(Triple, Args);
  30   getFilePaths().push_back(computeSysRoot() + "/lib");
  31   if (GCCInstallation.isValid()) {
  32     getFilePaths().push_back(GCCInstallation.getInstallPath().str());
  33     getProgramPaths().push_back(
  34         (GCCInstallation.getParentLibPath() + "/../bin").str());
  35   }
  36 }
  37
  38 Tool *RISCVToolChain::buildLinker() const {
  39   return new tools::RISCV::Linker(*this);
  40 }
  41
  42 void RISCVToolChain::addClangTargetOptions(
  43     const llvm::opt::ArgList &DriverArgs,
  44     llvm::opt::ArgStringList &CC1Args,
  45     Action::OffloadKind) const {
  46   CC1Args.push_back("-nostdsysteminc");
  47   CC1Args.push_back("-fuse-init-array");
  48 }
  49
  50 void RISCVToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
  51                                                ArgStringList &CC1Args) const {
  52   if (DriverArgs.hasArg(options::OPT_nostdinc))
  53     return;
  54
  55   if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
  56     SmallString<128> Dir(computeSysRoot());
  57     llvm::sys::path::append(Dir, "include");
  58     addSystemInclude(DriverArgs, CC1Args, Dir.str());
  59   }
  60 }
  61
  62 void RISCVToolChain::addLibStdCxxIncludePaths(
  63     const llvm::opt::ArgList &DriverArgs,
  64     llvm::opt::ArgStringList &CC1Args) const {
  65   const GCCVersion &Version = GCCInstallation.getVersion();
  66   StringRef TripleStr = GCCInstallation.getTriple().str();
  67   const Multilib &Multilib = GCCInstallation.getMultilib();
  68   addLibStdCXXIncludePaths(computeSysRoot() + "/include/c++/" + Version.Text,
  69       "", TripleStr, "", "", Multilib.includeSuffix(), DriverArgs, CC1Args);
  70 }
  71
  72 std::string RISCVToolChain::computeSysRoot() const {
  73   if (!getDriver().SysRoot.empty())
  74     return getDriver().SysRoot;
  75
  76   if (!GCCInstallation.isValid())
  77     return std::string();
  78
  79   StringRef LibDir = GCCInstallation.getParentLibPath();
  80   StringRef TripleStr = GCCInstallation.getTriple().str();
  81   std::string SysRootDir = LibDir.str() + "/../" + TripleStr.str();
  82
  83   if (!llvm::sys::fs::exists(SysRootDir))
  84     return std::string();
  85
  86   return SysRootDir;
  87 }
  88
  89 void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
  90                                  const InputInfo &Output,
  91                                  const InputInfoList &Inputs,
  92                                  const ArgList &Args,
  93                                  const char *LinkingOutput) const {
  94   const ToolChain &ToolChain = getToolChain();
  95   const Driver &D = ToolChain.getDriver();
  96   ArgStringList CmdArgs;
  97
  98   if (!D.SysRoot.empty())
  99     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
 100
 101   std::string Linker = getToolChain().GetProgramPath(getShortName());
 102
 103   bool WantCRTs =
 104       !Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles);
 105
 106   if (WantCRTs) {
 107     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
 108     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o")));
 109   }
 110
 111   Args.AddAllArgs(CmdArgs, options::OPT_L);
 112   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
 113   Args.AddAllArgs(CmdArgs,
 114                   {options::OPT_T_Group, options::OPT_e, options::OPT_s,
 115                    options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
 116
 117   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
 118
 119   // TODO: add C++ includes and libs if compiling C++.
 120
 121   if (!Args.hasArg(options::OPT_nostdlib) &&
 122       !Args.hasArg(options::OPT_nodefaultlibs)) {
 123     if (ToolChain.ShouldLinkCXXStdlib(Args))
 124       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
 125     CmdArgs.push_back("--start-group");
 126     CmdArgs.push_back("-lc");
 127     CmdArgs.push_back("-lgloss");
 128     CmdArgs.push_back("--end-group");
 129     CmdArgs.push_back("-lgcc");
 130   }
 131
 132   if (WantCRTs)
 133     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
 134
 135   CmdArgs.push_back("-o");
 136   CmdArgs.push_back(Output.getFilename());
 137   C.addCommand(llvm::make_unique<Command>(JA, *this, Args.MakeArgString(Linker),
 138                                           CmdArgs, Inputs));
 139 }
 140 // RISCV tools end.