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//===--- BaremMetal.cpp - Bare Metal ToolChain ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "BareMetal.h"
#include "CommonArgs.h"
#include "InputInfo.h"
#include "Gnu.h"
#include "clang/Basic/VirtualFileSystem.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm::opt;
using namespace clang;
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang::driver::toolchains;
BareMetal::BareMetal(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: ToolChain(D, Triple, Args) {
getProgramPaths().push_back(getDriver().getInstalledDir());
if (getDriver().getInstalledDir() != getDriver().Dir)
getProgramPaths().push_back(getDriver().Dir);
}
BareMetal::~BareMetal() {}
/// Is the triple {arm,thumb}-none-none-{eabi,eabihf} ?
static bool isARMBareMetal(const llvm::Triple &Triple) {
if (Triple.getArch() != llvm::Triple::arm &&
Triple.getArch() != llvm::Triple::thumb)
return false;
if (Triple.getVendor() != llvm::Triple::UnknownVendor)
return false;
if (Triple.getOS() != llvm::Triple::UnknownOS)
return false;
if (Triple.getEnvironment() != llvm::Triple::EABI &&
Triple.getEnvironment() != llvm::Triple::EABIHF)
return false;
return true;
}
bool BareMetal::handlesTarget(const llvm::Triple &Triple) {
return isARMBareMetal(Triple);
}
Tool *BareMetal::buildLinker() const {
return new tools::baremetal::Linker(*this);
}
std::string BareMetal::getRuntimesDir() const {
SmallString<128> Dir(getDriver().ResourceDir);
llvm::sys::path::append(Dir, "lib", "baremetal");
return Dir.str();
}
void BareMetal::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(options::OPT_nostdinc))
return;
if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
SmallString<128> Dir(getDriver().ResourceDir);
llvm::sys::path::append(Dir, "include");
addSystemInclude(DriverArgs, CC1Args, Dir.str());
}
if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
SmallString<128> Dir(getDriver().SysRoot);
llvm::sys::path::append(Dir, "include");
addSystemInclude(DriverArgs, CC1Args, Dir.str());
}
}
void BareMetal::addClangTargetOptions(const ArgList &DriverArgs,
ArgStringList &CC1Args,
Action::OffloadKind) const {
CC1Args.push_back("-nostdsysteminc");
}
std::string BareMetal::findLibCxxIncludePath(CXXStdlibType LibType) const {
StringRef SysRoot = getDriver().SysRoot;
if (SysRoot.empty())
return "";
switch (LibType) {
case ToolChain::CST_Libcxx: {
SmallString<128> Dir(SysRoot);
llvm::sys::path::append(Dir, "include", "c++", "v1");
return Dir.str();
}
case ToolChain::CST_Libstdcxx: {
SmallString<128> Dir(SysRoot);
llvm::sys::path::append(Dir, "include", "c++");
std::error_code EC;
Generic_GCC::GCCVersion Version = {"", -1, -1, -1, "", "", ""};
// Walk the subdirs, and find the one with the newest gcc version:
for (vfs::directory_iterator LI =
getDriver().getVFS().dir_begin(Dir.str(), EC), LE;
!EC && LI != LE; LI = LI.increment(EC)) {
StringRef VersionText = llvm::sys::path::filename(LI->getName());
auto CandidateVersion = Generic_GCC::GCCVersion::Parse(VersionText);
if (CandidateVersion.Major == -1)
continue;
if (CandidateVersion <= Version)
continue;
Version = CandidateVersion;
}
if (Version.Major == -1)
return "";
llvm::sys::path::append(Dir, Version.Text);
return Dir.str();
}
}
llvm_unreachable("unhandled LibType");
}
void BareMetal::AddClangCXXStdlibIncludeArgs(
const ArgList &DriverArgs, ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(options::OPT_nostdinc) ||
DriverArgs.hasArg(options::OPT_nostdlibinc) ||
DriverArgs.hasArg(options::OPT_nostdincxx))
return;
std::string Path = findLibCxxIncludePath(GetCXXStdlibType(DriverArgs));
if (!Path.empty())
addSystemInclude(DriverArgs, CC1Args, Path);
}
void BareMetal::AddCXXStdlibLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
switch (GetCXXStdlibType(Args)) {
case ToolChain::CST_Libcxx:
CmdArgs.push_back("-lc++");
CmdArgs.push_back("-lc++abi");
break;
case ToolChain::CST_Libstdcxx:
CmdArgs.push_back("-lstdc++");
CmdArgs.push_back("-lsupc++");
break;
}
CmdArgs.push_back("-lunwind");
}
void BareMetal::AddLinkRuntimeLib(const ArgList &Args,
ArgStringList &CmdArgs) const {
CmdArgs.push_back(Args.MakeArgString("-lclang_rt.builtins-" +
getTriple().getArchName() + ".a"));
}
void baremetal::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
ArgStringList CmdArgs;
auto &TC = static_cast<const toolchains::BareMetal&>(getToolChain());
AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
CmdArgs.push_back("-Bstatic");
CmdArgs.push_back(Args.MakeArgString("-L" + TC.getRuntimesDir()));
Args.AddAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group,
options::OPT_e, options::OPT_s, options::OPT_t,
options::OPT_Z_Flag, options::OPT_r});
if (TC.ShouldLinkCXXStdlib(Args))
TC.AddCXXStdlibLibArgs(Args, CmdArgs);
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
CmdArgs.push_back("-lc");
CmdArgs.push_back("-lm");
TC.AddLinkRuntimeLib(Args, CmdArgs);
}
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
C.addCommand(llvm::make_unique<Command>(JA, *this,
Args.MakeArgString(TC.GetLinkerPath()),
CmdArgs, Inputs));
}
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