//===--- NetBSD.cpp - NetBSD 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 "NetBSD.h"
#include "Arch/ARM.h"
#include "Arch/Mips.h"
#include "Arch/Sparc.h"
#include "CommonArgs.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/VirtualFileSystem.h"

using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;

void netbsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
                                     const InputInfo &Output,
                                     const InputInfoList &Inputs,
                                     const ArgList &Args,
                                     const char *LinkingOutput) const {
  const toolchains::NetBSD &ToolChain =
    static_cast<const toolchains::NetBSD &>(getToolChain());
  const Driver &D = ToolChain.getDriver();
  const llvm::Triple &Triple = ToolChain.getTriple();

  claimNoWarnArgs(Args);
  ArgStringList CmdArgs;

  // GNU as needs different flags for creating the correct output format
  // on architectures with different ABIs or optional feature sets.
  switch (ToolChain.getArch()) {
  case llvm::Triple::x86:
    CmdArgs.push_back("--32");
    break;
  case llvm::Triple::arm:
  case llvm::Triple::armeb:
  case llvm::Triple::thumb:
  case llvm::Triple::thumbeb: {
    StringRef MArch, MCPU;
    arm::getARMArchCPUFromArgs(Args, MArch, MCPU, /*FromAs*/ true);
    std::string Arch = arm::getARMTargetCPU(MCPU, MArch, Triple);
    CmdArgs.push_back(Args.MakeArgString("-mcpu=" + Arch));
    break;
  }

  case llvm::Triple::mips:
  case llvm::Triple::mipsel:
  case llvm::Triple::mips64:
  case llvm::Triple::mips64el: {
    StringRef CPUName;
    StringRef ABIName;
    mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);

    CmdArgs.push_back("-march");
    CmdArgs.push_back(CPUName.data());

    CmdArgs.push_back("-mabi");
    CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());

    if (Triple.isLittleEndian())
      CmdArgs.push_back("-EL");
    else
      CmdArgs.push_back("-EB");

    AddAssemblerKPIC(ToolChain, Args, CmdArgs);
    break;
  }

  case llvm::Triple::sparc:
  case llvm::Triple::sparcel: {
    CmdArgs.push_back("-32");
    std::string CPU = getCPUName(D, Args, Triple);
    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, Triple));
    AddAssemblerKPIC(ToolChain, Args, CmdArgs);
    break;
  }

  case llvm::Triple::sparcv9: {
    CmdArgs.push_back("-64");
    std::string CPU = getCPUName(D, Args, Triple);
    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, Triple));
    AddAssemblerKPIC(ToolChain, Args, CmdArgs);
    break;
  }

  default:
    break;
  }

  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);

  CmdArgs.push_back("-o");
  CmdArgs.push_back(Output.getFilename());

  for (const auto &II : Inputs)
    CmdArgs.push_back(II.getFilename());

  const char *Exec = Args.MakeArgString((ToolChain.GetProgramPath("as")));
  C.addCommand(std::make_unique<Command>(JA, *this,
                                         ResponseFileSupport::AtFileCurCP(),
                                         Exec, CmdArgs, Inputs, Output));
}

void netbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                  const InputInfo &Output,
                                  const InputInfoList &Inputs,
                                  const ArgList &Args,
                                  const char *LinkingOutput) const {
  const toolchains::NetBSD &ToolChain =
    static_cast<const toolchains::NetBSD &>(getToolChain());
  const Driver &D = ToolChain.getDriver();
  const llvm::Triple &Triple = ToolChain.getTriple();

  ArgStringList CmdArgs;

  if (!D.SysRoot.empty())
    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));

  CmdArgs.push_back("--eh-frame-hdr");
  if (Args.hasArg(options::OPT_static)) {
    CmdArgs.push_back("-Bstatic");
    if (Args.hasArg(options::OPT_pie)) {
      Args.AddAllArgs(CmdArgs, options::OPT_pie);
      CmdArgs.push_back("--no-dynamic-linker");
    }
  } else {
    if (Args.hasArg(options::OPT_rdynamic))
      CmdArgs.push_back("-export-dynamic");
    if (Args.hasArg(options::OPT_shared)) {
      CmdArgs.push_back("-Bshareable");
    } else {
      Args.AddAllArgs(CmdArgs, options::OPT_pie);
      CmdArgs.push_back("-dynamic-linker");
      CmdArgs.push_back("/libexec/ld.elf_so");
    }
  }

  // Many NetBSD architectures support more than one ABI.
  // Determine the correct emulation for ld.
  switch (ToolChain.getArch()) {
  case llvm::Triple::x86:
    CmdArgs.push_back("-m");
    CmdArgs.push_back("elf_i386");
    break;
  case llvm::Triple::arm:
  case llvm::Triple::thumb:
    CmdArgs.push_back("-m");
    switch (Triple.getEnvironment()) {
    case llvm::Triple::EABI:
    case llvm::Triple::GNUEABI:
      CmdArgs.push_back("armelf_nbsd_eabi");
      break;
    case llvm::Triple::EABIHF:
    case llvm::Triple::GNUEABIHF:
      CmdArgs.push_back("armelf_nbsd_eabihf");
      break;
    default:
      CmdArgs.push_back("armelf_nbsd");
      break;
    }
    break;
  case llvm::Triple::armeb:
  case llvm::Triple::thumbeb:
    arm::appendBE8LinkFlag(Args, CmdArgs, ToolChain.getEffectiveTriple());
    CmdArgs.push_back("-m");
    switch (Triple.getEnvironment()) {
    case llvm::Triple::EABI:
    case llvm::Triple::GNUEABI:
      CmdArgs.push_back("armelfb_nbsd_eabi");
      break;
    case llvm::Triple::EABIHF:
    case llvm::Triple::GNUEABIHF:
      CmdArgs.push_back("armelfb_nbsd_eabihf");
      break;
    default:
      CmdArgs.push_back("armelfb_nbsd");
      break;
    }
    break;
  case llvm::Triple::mips64:
  case llvm::Triple::mips64el:
    if (mips::hasMipsAbiArg(Args, "32")) {
      CmdArgs.push_back("-m");
      if (ToolChain.getArch() == llvm::Triple::mips64)
        CmdArgs.push_back("elf32btsmip");
      else
        CmdArgs.push_back("elf32ltsmip");
    } else if (mips::hasMipsAbiArg(Args, "64")) {
      CmdArgs.push_back("-m");
      if (ToolChain.getArch() == llvm::Triple::mips64)
        CmdArgs.push_back("elf64btsmip");
      else
        CmdArgs.push_back("elf64ltsmip");
    }
    break;
  case llvm::Triple::ppc:
    CmdArgs.push_back("-m");
    CmdArgs.push_back("elf32ppc_nbsd");
    break;

  case llvm::Triple::ppc64:
  case llvm::Triple::ppc64le:
    CmdArgs.push_back("-m");
    CmdArgs.push_back("elf64ppc");
    break;

  case llvm::Triple::sparc:
    CmdArgs.push_back("-m");
    CmdArgs.push_back("elf32_sparc");
    break;

  case llvm::Triple::sparcv9:
    CmdArgs.push_back("-m");
    CmdArgs.push_back("elf64_sparc");
    break;

  default:
    break;
  }

  if (Output.isFilename()) {
    CmdArgs.push_back("-o");
    CmdArgs.push_back(Output.getFilename());
  } else {
    assert(Output.isNothing() && "Invalid output.");
  }

  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
    if (!Args.hasArg(options::OPT_shared)) {
      CmdArgs.push_back(
          Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
    }
    CmdArgs.push_back(
        Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
    if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_pie)) {
      CmdArgs.push_back(
          Args.MakeArgString(ToolChain.GetFilePath("crtbeginS.o")));
    } else {
      CmdArgs.push_back(
          Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o")));
    }
  }

  Args.AddAllArgs(CmdArgs, options::OPT_L);
  Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
  Args.AddAllArgs(CmdArgs, options::OPT_e);
  Args.AddAllArgs(CmdArgs, options::OPT_s);
  Args.AddAllArgs(CmdArgs, options::OPT_t);
  Args.AddAllArgs(CmdArgs, options::OPT_Z_Flag);
  Args.AddAllArgs(CmdArgs, options::OPT_r);

  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

  const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs(Args);
  if (SanArgs.needsSharedRt()) {
    CmdArgs.push_back("-rpath");
    CmdArgs.push_back(Args.MakeArgString(ToolChain.getCompilerRTPath()));
  }

  VersionTuple OsVersion = Triple.getOSVersion();
  bool useLibgcc = true;
  if (OsVersion >= VersionTuple(7) || OsVersion.getMajor() == 0) {
    switch (ToolChain.getArch()) {
    case llvm::Triple::aarch64:
    case llvm::Triple::aarch64_be:
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
    case llvm::Triple::ppc:
    case llvm::Triple::ppc64:
    case llvm::Triple::ppc64le:
    case llvm::Triple::sparc:
    case llvm::Triple::sparcv9:
    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      useLibgcc = false;
      break;
    default:
      break;
    }
  }

  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
    // Use the static OpenMP runtime with -static-openmp
    bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
                        !Args.hasArg(options::OPT_static);
    addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP);

    if (D.CCCIsCXX()) {
      if (ToolChain.ShouldLinkCXXStdlib(Args))
        ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
      CmdArgs.push_back("-lm");
    }
    if (NeedsSanitizerDeps)
      linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
    if (NeedsXRayDeps)
      linkXRayRuntimeDeps(ToolChain, CmdArgs);
    if (Args.hasArg(options::OPT_pthread))
      CmdArgs.push_back("-lpthread");
    CmdArgs.push_back("-lc");

    if (useLibgcc) {
      if (Args.hasArg(options::OPT_static)) {
        // libgcc_eh depends on libc, so resolve as much as possible,
        // pull in any new requirements from libc and then get the rest
        // of libgcc.
        CmdArgs.push_back("-lgcc_eh");
        CmdArgs.push_back("-lc");
        CmdArgs.push_back("-lgcc");
      } else {
        CmdArgs.push_back("-lgcc");
        CmdArgs.push_back("--as-needed");
        CmdArgs.push_back("-lgcc_s");
        CmdArgs.push_back("--no-as-needed");
      }
    }
  }

  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
    if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_pie))
      CmdArgs.push_back(
          Args.MakeArgString(ToolChain.GetFilePath("crtendS.o")));
    else
      CmdArgs.push_back(
          Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
    CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
  }

  ToolChain.addProfileRTLibs(Args, CmdArgs);

  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
  C.addCommand(std::make_unique<Command>(JA, *this,
                                         ResponseFileSupport::AtFileCurCP(),
                                         Exec, CmdArgs, Inputs, Output));
}

/// NetBSD - NetBSD tool chain which can call as(1) and ld(1) directly.

NetBSD::NetBSD(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
    : Generic_ELF(D, Triple, Args) {
  if (!Args.hasArg(options::OPT_nostdlib)) {
    // When targeting a 32-bit platform, try the special directory used on
    // 64-bit hosts, and only fall back to the main library directory if that
    // doesn't work.
    // FIXME: It'd be nicer to test if this directory exists, but I'm not sure
    // what all logic is needed to emulate the '=' prefix here.
    switch (Triple.getArch()) {
    case llvm::Triple::x86:
      getFilePaths().push_back("=/usr/lib/i386");
      break;
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
      switch (Triple.getEnvironment()) {
      case llvm::Triple::EABI:
      case llvm::Triple::GNUEABI:
        getFilePaths().push_back("=/usr/lib/eabi");
        break;
      case llvm::Triple::EABIHF:
      case llvm::Triple::GNUEABIHF:
        getFilePaths().push_back("=/usr/lib/eabihf");
        break;
      default:
        getFilePaths().push_back("=/usr/lib/oabi");
        break;
      }
      break;
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
      if (tools::mips::hasMipsAbiArg(Args, "o32"))
        getFilePaths().push_back("=/usr/lib/o32");
      else if (tools::mips::hasMipsAbiArg(Args, "64"))
        getFilePaths().push_back("=/usr/lib/64");
      break;
    case llvm::Triple::ppc:
      getFilePaths().push_back("=/usr/lib/powerpc");
      break;
    case llvm::Triple::sparc:
      getFilePaths().push_back("=/usr/lib/sparc");
      break;
    default:
      break;
    }

    getFilePaths().push_back("=/usr/lib");
  }
}

Tool *NetBSD::buildAssembler() const {
  return new tools::netbsd::Assembler(*this);
}

Tool *NetBSD::buildLinker() const { return new tools::netbsd::Linker(*this); }

ToolChain::CXXStdlibType NetBSD::GetDefaultCXXStdlibType() const {
  VersionTuple OsVersion = getTriple().getOSVersion();
  if (OsVersion >= VersionTuple(7) || OsVersion.getMajor() == 0) {
    switch (getArch()) {
    case llvm::Triple::aarch64:
    case llvm::Triple::aarch64_be:
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
    case llvm::Triple::ppc:
    case llvm::Triple::ppc64:
    case llvm::Triple::ppc64le:
    case llvm::Triple::sparc:
    case llvm::Triple::sparcv9:
    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      return ToolChain::CST_Libcxx;
    default:
      break;
    }
  }
  return ToolChain::CST_Libstdcxx;
}

void NetBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
                                   llvm::opt::ArgStringList &CC1Args) const {
  const std::string Candidates[] = {
    // directory relative to build tree
    getDriver().Dir + "/../include/c++/v1",
    // system install with full upstream path
    getDriver().SysRoot + "/usr/include/c++/v1",
    // system install from src
    getDriver().SysRoot + "/usr/include/c++",
  };

  for (const auto &IncludePath : Candidates) {
    if (!getVFS().exists(IncludePath + "/__config"))
      continue;

    // Use the first candidate that looks valid.
    addSystemInclude(DriverArgs, CC1Args, IncludePath);
    return;
  }
}

void NetBSD::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
                                      llvm::opt::ArgStringList &CC1Args) const {
  addLibStdCXXIncludePaths(getDriver().SysRoot + "/usr/include/g++", "", "",
                           DriverArgs, CC1Args);
}

llvm::ExceptionHandling NetBSD::GetExceptionModel(const ArgList &Args) const {
  // NetBSD uses Dwarf exceptions on ARM.
  llvm::Triple::ArchType TArch = getTriple().getArch();
  if (TArch == llvm::Triple::arm || TArch == llvm::Triple::armeb ||
      TArch == llvm::Triple::thumb || TArch == llvm::Triple::thumbeb)
    return llvm::ExceptionHandling::DwarfCFI;
  return llvm::ExceptionHandling::None;
}

SanitizerMask NetBSD::getSupportedSanitizers() const {
  const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
  const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
  SanitizerMask Res = ToolChain::getSupportedSanitizers();
  if (IsX86 || IsX86_64) {
    Res |= SanitizerKind::Address;
    Res |= SanitizerKind::PointerCompare;
    Res |= SanitizerKind::PointerSubtract;
    Res |= SanitizerKind::Function;
    Res |= SanitizerKind::Leak;
    Res |= SanitizerKind::SafeStack;
    Res |= SanitizerKind::Scudo;
    Res |= SanitizerKind::Vptr;
  }
  if (IsX86_64) {
    Res |= SanitizerKind::DataFlow;
    Res |= SanitizerKind::Fuzzer;
    Res |= SanitizerKind::FuzzerNoLink;
    Res |= SanitizerKind::HWAddress;
    Res |= SanitizerKind::KernelAddress;
    Res |= SanitizerKind::KernelHWAddress;
    Res |= SanitizerKind::KernelMemory;
    Res |= SanitizerKind::Memory;
    Res |= SanitizerKind::Thread;
  }
  return Res;
}

void NetBSD::addClangTargetOptions(const ArgList &DriverArgs,
                                   ArgStringList &CC1Args,
                                   Action::OffloadKind) const {
  const SanitizerArgs &SanArgs = getSanitizerArgs(DriverArgs);
  if (SanArgs.hasAnySanitizer())
    CC1Args.push_back("-D_REENTRANT");

  VersionTuple OsVersion = getTriple().getOSVersion();
  bool UseInitArrayDefault =
      OsVersion >= VersionTuple(9) || OsVersion.getMajor() == 0 ||
      getTriple().getArch() == llvm::Triple::aarch64 ||
      getTriple().getArch() == llvm::Triple::aarch64_be ||
      getTriple().getArch() == llvm::Triple::arm ||
      getTriple().getArch() == llvm::Triple::armeb;

  if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
                          options::OPT_fno_use_init_array, UseInitArrayDefault))
    CC1Args.push_back("-fno-use-init-array");
}