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//===--- RISCVToolchain.cpp - RISCV ToolChain Implementations ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "RISCVToolchain.h"
#include "CommonArgs.h"
#include "InputInfo.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Options.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang::driver;
using namespace clang::driver::toolchains;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm::opt;
static void addMultilibsFilePaths(const Driver &D, const MultilibSet &Multilibs,
const Multilib &Multilib,
StringRef InstallPath,
ToolChain::path_list &Paths) {
if (const auto &PathsCallback = Multilibs.filePathsCallback())
for (const auto &Path : PathsCallback(Multilib))
addPathIfExists(D, InstallPath + Path, Paths);
}
// This function tests whether a gcc installation is present either
// through gcc-toolchain argument or in the same prefix where clang
// is installed. This helps decide whether to instantiate this toolchain
// or Baremetal toolchain.
bool RISCVToolChain::hasGCCToolchain(const Driver &D,
const llvm::opt::ArgList &Args) {
if (Args.getLastArg(options::OPT_gcc_toolchain))
return true;
SmallString<128> GCCDir;
llvm::sys::path::append(GCCDir, D.Dir, "..", D.getTargetTriple(),
"lib/crt0.o");
return llvm::sys::fs::exists(GCCDir);
}
/// RISCV Toolchain
RISCVToolChain::RISCVToolChain(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: Generic_ELF(D, Triple, Args) {
GCCInstallation.init(Triple, Args);
if (GCCInstallation.isValid()) {
Multilibs = GCCInstallation.getMultilibs();
SelectedMultilib = GCCInstallation.getMultilib();
path_list &Paths = getFilePaths();
// Add toolchain/multilib specific file paths.
addMultilibsFilePaths(D, Multilibs, SelectedMultilib,
GCCInstallation.getInstallPath(), Paths);
getFilePaths().push_back(GCCInstallation.getInstallPath().str());
ToolChain::path_list &PPaths = getProgramPaths();
// Multilib cross-compiler GCC installations put ld in a triple-prefixed
// directory off of the parent of the GCC installation.
PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
GCCInstallation.getTriple().str() + "/bin")
.str());
PPaths.push_back((GCCInstallation.getParentLibPath() + "/../bin").str());
} else {
getProgramPaths().push_back(D.Dir);
}
getFilePaths().push_back(computeSysRoot() + "/lib");
}
Tool *RISCVToolChain::buildLinker() const {
return new tools::RISCV::Linker(*this);
}
ToolChain::RuntimeLibType RISCVToolChain::GetDefaultRuntimeLibType() const {
return GCCInstallation.isValid() ?
ToolChain::RLT_Libgcc : ToolChain::RLT_CompilerRT;
}
ToolChain::UnwindLibType
RISCVToolChain::GetUnwindLibType(const llvm::opt::ArgList &Args) const {
return ToolChain::UNW_None;
}
void RISCVToolChain::addClangTargetOptions(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args,
Action::OffloadKind) const {
CC1Args.push_back("-nostdsysteminc");
}
void RISCVToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(options::OPT_nostdinc))
return;
if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
SmallString<128> Dir(computeSysRoot());
llvm::sys::path::append(Dir, "include");
addSystemInclude(DriverArgs, CC1Args, Dir.str());
}
}
void RISCVToolChain::addLibStdCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
const GCCVersion &Version = GCCInstallation.getVersion();
StringRef TripleStr = GCCInstallation.getTriple().str();
const Multilib &Multilib = GCCInstallation.getMultilib();
addLibStdCXXIncludePaths(computeSysRoot() + "/include/c++/" + Version.Text,
"", TripleStr, "", "", Multilib.includeSuffix(), DriverArgs, CC1Args);
}
std::string RISCVToolChain::computeSysRoot() const {
if (!getDriver().SysRoot.empty())
return getDriver().SysRoot;
SmallString<128> SysRootDir;
if (GCCInstallation.isValid()) {
StringRef LibDir = GCCInstallation.getParentLibPath();
StringRef TripleStr = GCCInstallation.getTriple().str();
llvm::sys::path::append(SysRootDir, LibDir, "..", TripleStr);
} else {
// Use the triple as provided to the driver. Unlike the parsed triple
// this has not been normalized to always contain every field.
llvm::sys::path::append(SysRootDir, getDriver().Dir, "..",
getDriver().getTargetTriple());
}
if (!llvm::sys::fs::exists(SysRootDir))
return std::string();
return std::string(SysRootDir.str());
}
void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const ToolChain &ToolChain = getToolChain();
const Driver &D = ToolChain.getDriver();
ArgStringList CmdArgs;
if (!D.SysRoot.empty())
CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
bool IsRV64 = ToolChain.getArch() == llvm::Triple::riscv64;
CmdArgs.push_back("-m");
if (IsRV64) {
CmdArgs.push_back("elf64lriscv");
} else {
CmdArgs.push_back("elf32lriscv");
}
std::string Linker = getToolChain().GetLinkerPath();
bool WantCRTs =
!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles);
const char *crtbegin, *crtend;
auto RuntimeLib = ToolChain.GetRuntimeLibType(Args);
if (RuntimeLib == ToolChain::RLT_Libgcc) {
crtbegin = "crtbegin.o";
crtend = "crtend.o";
} else {
assert (RuntimeLib == ToolChain::RLT_CompilerRT);
crtbegin = ToolChain.getCompilerRTArgString(Args, "crtbegin",
ToolChain::FT_Object);
crtend = ToolChain.getCompilerRTArgString(Args, "crtend",
ToolChain::FT_Object);
}
if (WantCRTs) {
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
}
Args.AddAllArgs(CmdArgs, options::OPT_L);
ToolChain.AddFilePathLibArgs(Args, CmdArgs);
Args.AddAllArgs(CmdArgs,
{options::OPT_T_Group, options::OPT_e, options::OPT_s,
options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
// TODO: add C++ includes and libs if compiling C++.
if (!Args.hasArg(options::OPT_nostdlib) &&
!Args.hasArg(options::OPT_nodefaultlibs)) {
if (ToolChain.ShouldLinkCXXStdlib(Args))
ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
CmdArgs.push_back("--start-group");
CmdArgs.push_back("-lc");
CmdArgs.push_back("-lgloss");
CmdArgs.push_back("--end-group");
AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
}
if (WantCRTs)
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
C.addCommand(std::make_unique<Command>(
JA, *this, ResponseFileSupport::AtFileCurCP(), Args.MakeArgString(Linker),
CmdArgs, Inputs, Output));
}
// RISCV tools end.
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