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

   1 //===--- BaremMetal.cpp - Bare Metal ToolChain ------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "BareMetal.h"
  11
  12 #include "CommonArgs.h"
  13 #include "InputInfo.h"
  14 #include "Gnu.h"
  15
  16 #include "clang/Basic/VirtualFileSystem.h"
  17 #include "clang/Driver/Compilation.h"
  18 #include "clang/Driver/Driver.h"
  19 #include "clang/Driver/DriverDiagnostic.h"
  20 #include "clang/Driver/Options.h"
  21 #include "llvm/Option/ArgList.h"
  22 #include "llvm/Support/Path.h"
  23 #include "llvm/Support/raw_ostream.h"
  24
  25 using namespace llvm::opt;
  26 using namespace clang;
  27 using namespace clang::driver;
  28 using namespace clang::driver::tools;
  29 using namespace clang::driver::toolchains;
  30
  31 BareMetal::BareMetal(const Driver &D, const llvm::Triple &Triple,
  32                            const ArgList &Args)
  33     : ToolChain(D, Triple, Args) {
  34   getProgramPaths().push_back(getDriver().getInstalledDir());
  35   if (getDriver().getInstalledDir() != getDriver().Dir)
  36     getProgramPaths().push_back(getDriver().Dir);
  37 }
  38
  39 BareMetal::~BareMetal() {}
  40
  41 /// Is the triple {arm,thumb}-none-none-{eabi,eabihf} ?
  42 static bool isARMBareMetal(const llvm::Triple &Triple) {
  43   if (Triple.getArch() != llvm::Triple::arm &&
  44       Triple.getArch() != llvm::Triple::thumb)
  45     return false;
  46
  47   if (Triple.getVendor() != llvm::Triple::UnknownVendor)
  48     return false;
  49
  50   if (Triple.getOS() != llvm::Triple::UnknownOS)
  51     return false;
  52
  53   if (Triple.getEnvironment() != llvm::Triple::EABI &&
  54       Triple.getEnvironment() != llvm::Triple::EABIHF)
  55     return false;
  56
  57   return true;
  58 }
  59
  60 bool BareMetal::handlesTarget(const llvm::Triple &Triple) {
  61   return isARMBareMetal(Triple);
  62 }
  63
  64 Tool *BareMetal::buildLinker() const {
  65   return new tools::baremetal::Linker(*this);
  66 }
  67
  68 std::string BareMetal::getThreadModel() const {
  69   return "single";
  70 }
  71
  72 bool BareMetal::isThreadModelSupported(const StringRef Model) const {
  73   return Model == "single";
  74 }
  75
  76 std::string BareMetal::getRuntimesDir() const {
  77   SmallString<128> Dir(getDriver().ResourceDir);
  78   llvm::sys::path::append(Dir, "lib", "baremetal");
  79   return Dir.str();
  80 }
  81
  82 void BareMetal::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
  83                                           ArgStringList &CC1Args) const {
  84   if (DriverArgs.hasArg(options::OPT_nostdinc))
  85     return;
  86
  87   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
  88     SmallString<128> Dir(getDriver().ResourceDir);
  89     llvm::sys::path::append(Dir, "include");
  90     addSystemInclude(DriverArgs, CC1Args, Dir.str());
  91   }
  92
  93   if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
  94     SmallString<128> Dir(getDriver().SysRoot);
  95     llvm::sys::path::append(Dir, "include");
  96     addSystemInclude(DriverArgs, CC1Args, Dir.str());
  97   }
  98 }
  99
 100 void BareMetal::addClangTargetOptions(const ArgList &DriverArgs,
 101                                       ArgStringList &CC1Args) const {
 102   CC1Args.push_back("-nostdsysteminc");
 103 }
 104
 105 std::string BareMetal::findLibCxxIncludePath(CXXStdlibType LibType) const {
 106   StringRef SysRoot = getDriver().SysRoot;
 107   if (SysRoot.empty())
 108     return "";
 109
 110   switch (LibType) {
 111   case ToolChain::CST_Libcxx: {
 112     SmallString<128> Dir(SysRoot);
 113     llvm::sys::path::append(Dir, "include", "c++", "v1");
 114     return Dir.str();
 115   }
 116   case ToolChain::CST_Libstdcxx: {
 117     SmallString<128> Dir(SysRoot);
 118     llvm::sys::path::append(Dir, "include", "c++");
 119     std::error_code EC;
 120     Generic_GCC::GCCVersion Version = {"", -1, -1, -1, "", "", ""};
 121     // Walk the subdirs, and find the one with the newest gcc version:
 122     for (vfs::directory_iterator LI =
 123            getDriver().getVFS().dir_begin(Dir.str(), EC), LE;
 124          !EC && LI != LE; LI = LI.increment(EC)) {
 125       StringRef VersionText = llvm::sys::path::filename(LI->getName());
 126       auto CandidateVersion = Generic_GCC::GCCVersion::Parse(VersionText);
 127       if (CandidateVersion.Major == -1)
 128         continue;
 129       if (CandidateVersion <= Version)
 130         continue;
 131       Version = CandidateVersion;
 132     }
 133     if (Version.Major == -1)
 134       return "";
 135     llvm::sys::path::append(Dir, Version.Text);
 136     return Dir.str();
 137   }
 138   }
 139   llvm_unreachable("unhandled LibType");
 140 }
 141
 142 void BareMetal::AddClangCXXStdlibIncludeArgs(
 143     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
 144   if (DriverArgs.hasArg(options::OPT_nostdinc) ||
 145       DriverArgs.hasArg(options::OPT_nostdlibinc) ||
 146       DriverArgs.hasArg(options::OPT_nostdincxx))
 147     return;
 148
 149   std::string Path = findLibCxxIncludePath(GetCXXStdlibType(DriverArgs));
 150   if (!Path.empty())
 151     addSystemInclude(DriverArgs, CC1Args, Path);
 152 }
 153
 154 void BareMetal::AddCXXStdlibLibArgs(const ArgList &Args,
 155                                     ArgStringList &CmdArgs) const {
 156   switch (GetCXXStdlibType(Args)) {
 157   case ToolChain::CST_Libcxx:
 158     CmdArgs.push_back("-lc++");
 159     CmdArgs.push_back("-lc++abi");
 160     break;
 161   case ToolChain::CST_Libstdcxx:
 162     CmdArgs.push_back("-lstdc++");
 163     CmdArgs.push_back("-lsupc++");
 164     break;
 165   }
 166   CmdArgs.push_back("-lunwind");
 167 }
 168
 169 void BareMetal::AddLinkRuntimeLib(const ArgList &Args,
 170                                   ArgStringList &CmdArgs) const {
 171   CmdArgs.push_back(Args.MakeArgString("-lclang_rt.builtins-" +
 172                                        getTriple().getArchName() + ".a"));
 173 }
 174
 175 void baremetal::Linker::ConstructJob(Compilation &C, const JobAction &JA,
 176                                      const InputInfo &Output,
 177                                      const InputInfoList &Inputs,
 178                                      const ArgList &Args,
 179                                      const char *LinkingOutput) const {
 180   ArgStringList CmdArgs;
 181
 182   auto &TC = static_cast<const toolchains::BareMetal&>(getToolChain());
 183
 184   AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
 185
 186   CmdArgs.push_back("-Bstatic");
 187
 188   CmdArgs.push_back(Args.MakeArgString("-L" + TC.getRuntimesDir()));
 189
 190   Args.AddAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group,
 191                             options::OPT_e, options::OPT_s, options::OPT_t,
 192                             options::OPT_Z_Flag, options::OPT_r});
 193
 194   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
 195     if (C.getDriver().CCCIsCXX())
 196       TC.AddCXXStdlibLibArgs(Args, CmdArgs);
 197
 198     CmdArgs.push_back("-lc");
 199     CmdArgs.push_back("-lm");
 200
 201     TC.AddLinkRuntimeLib(Args, CmdArgs);
 202   }
 203
 204   CmdArgs.push_back("-o");
 205   CmdArgs.push_back(Output.getFilename());
 206
 207   C.addCommand(llvm::make_unique<Command>(JA, *this,
 208                                           Args.MakeArgString(TC.GetLinkerPath()),
 209                                           CmdArgs, Inputs));
 210 }