//===--- Fuchsia.cpp - Fuchsia 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 "Fuchsia.h"

#include "CommonArgs.h"

#include "clang/Config/config.h"

#include "clang/Driver/Compilation.h"

#include "clang/Driver/Driver.h"

#include "clang/Driver/DriverDiagnostic.h"

#include "clang/Driver/Options.h"

#include "clang/Driver/SanitizerArgs.h"

#include "llvm/Option/ArgList.h"

#include "llvm/Support/FileSystem.h"

#include "llvm/Support/Path.h"

#include "llvm/Support/VirtualFileSystem.h"

using namespace clang::driver;

using namespace clang::driver::toolchains;

using namespace clang::driver::tools;

using namespace clang;

using namespace llvm::opt;

using tools::addMultilibFlag;

void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,

                                   const InputInfo &Output,

                                   const InputInfoList &Inputs,

                                   const ArgList &Args,

                                   const char *LinkingOutput) const {

  const toolchains::Fuchsia &ToolChain =

      static_cast<const toolchains::Fuchsia &>(getToolChain());

  const Driver &D = ToolChain.getDriver();

  ArgStringList CmdArgs;

  // Silence warning for "clang -g foo.o -o foo"

  Args.ClaimAllArgs(options::OPT_g_Group);

  // and "clang -emit-llvm foo.o -o foo"

  Args.ClaimAllArgs(options::OPT_emit_llvm);

  // and for "clang -w foo.o -o foo". Other warning options are already

  // handled somewhere else.

  Args.ClaimAllArgs(options::OPT_w);

  CmdArgs.push_back("-z");

  CmdArgs.push_back("now");

  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());

  if (llvm::sys::path::filename(Exec).equals_lower("ld.lld") ||

      
llvm::sys::path::stem(Exec).equals_lower("ld.lld")0
) {

    CmdArgs.push_back("-z");

    CmdArgs.push_back("rodynamic");

    CmdArgs.push_back("-z");

    CmdArgs.push_back("separate-loadable-segments");

  }

  if (!D.SysRoot.empty())

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

  if (!Args.hasArg(options::OPT_shared) && 
!Args.hasArg(options::OPT_r)32
)

    CmdArgs.push_back("-pie");

  if (Args.hasArg(options::OPT_rdynamic))

    CmdArgs.push_back("-export-dynamic");

  if (Args.hasArg(options::OPT_s))

    CmdArgs.push_back("-s");

  if (Args.hasArg(options::OPT_r)) {

    CmdArgs.push_back("-r");

  } else {

    CmdArgs.push_back("--build-id");

    CmdArgs.push_back("--hash-style=gnu");

  }

  CmdArgs.push_back("--eh-frame-hdr");

  if (Args.hasArg(options::OPT_static))

    CmdArgs.push_back("-Bstatic");

  else if (Args.hasArg(options::OPT_shared))

    CmdArgs.push_back("-shared");

  const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs();

  if (!Args.hasArg(options::OPT_shared)) {

    std::string Dyld = D.DyldPrefix;

    if (SanArgs.needsAsanRt() && 
SanArgs.needsSharedRt()4
)

      Dyld += "asan/";

    Dyld += "ld.so.1";

    CmdArgs.push_back("-dynamic-linker");

    CmdArgs.push_back(Args.MakeArgString(Dyld));

  }

  CmdArgs.push_back("-o");

  CmdArgs.push_back(Output.getFilename());

  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {

    if (!Args.hasArg(options::OPT_shared)) {

      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));

    }

  }

  Args.AddAllArgs(CmdArgs, options::OPT_L);

  Args.AddAllArgs(CmdArgs, options::OPT_u);

  ToolChain.AddFilePathLibArgs(Args, CmdArgs);

  if (D.isUsingLTO()) {

    assert(!Inputs.empty() && "Must have at least one input.");

    addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],

                  D.getLTOMode() == LTOK_Thin);

  }

  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);

  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);

  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

  ToolChain.addProfileRTLibs(Args, CmdArgs);

  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {

    if (Args.hasArg(options::OPT_static))

      CmdArgs.push_back("-Bdynamic");

    if (D.CCCIsCXX()) {

      if (ToolChain.ShouldLinkCXXStdlib(Args)) {

        bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&

                                   
!Args.hasArg(options::OPT_static)1
;

        CmdArgs.push_back("--push-state");

        CmdArgs.push_back("--as-needed");

        if (OnlyLibstdcxxStatic)

          CmdArgs.push_back("-Bstatic");

        ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);

        if (OnlyLibstdcxxStatic)

          CmdArgs.push_back("-Bdynamic");

        CmdArgs.push_back("-lm");

        CmdArgs.push_back("--pop-state");

      }

    }

    if (NeedsSanitizerDeps)

      linkSanitizerRuntimeDeps(ToolChain, CmdArgs);

    if (NeedsXRayDeps)

      linkXRayRuntimeDeps(ToolChain, CmdArgs);

    AddRunTimeLibs(ToolChain, D, CmdArgs, Args);

    if (Args.hasArg(options::OPT_pthread) ||

        Args.hasArg(options::OPT_pthreads))

      CmdArgs.push_back("-lpthread");

    if (Args.hasArg(options::OPT_fsplit_stack))

      CmdArgs.push_back("--wrap=pthread_create");

    if (!Args.hasArg(options::OPT_nolibc))

      CmdArgs.push_back("-lc");

  }

  C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));

}

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

Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,

                 const ArgList &Args)

    : ToolChain(D, Triple, Args) {

  getProgramPaths().push_back(getDriver().getInstalledDir());

  if (getDriver().getInstalledDir() != D.Dir)

    getProgramPaths().push_back(D.Dir);

  if (!D.SysRoot.empty()) {

    SmallString<128> P(D.SysRoot);

    llvm::sys::path::append(P, "lib");

    getFilePaths().push_back(std::string(P.str()));

  }

  auto FilePaths = [&](const Multilib &M) -> std::vector<std::string> {

    std::vector<std::string> FP;

    if (D.CCCIsCXX()) {

      if (auto CXXStdlibPath = getCXXStdlibPath()) {

        SmallString<128> P(*CXXStdlibPath);

        llvm::sys::path::append(P, M.gccSuffix());

        FP.push_back(std::string(P.str()));

      }

    }

    return FP;

  };

  Multilibs.push_back(Multilib());

  // Use the noexcept variant with -fno-exceptions to avoid the extra overhead.

  Multilibs.push_back(Multilib("noexcept", {}, {}, 1)

                          .flag("-fexceptions")

                          .flag("+fno-exceptions"));

  // ASan has higher priority because we always want the instrumentated version.

  Multilibs.push_back(Multilib("asan", {}, {}, 2)

                          .flag("+fsanitize=address"));

  // Use the asan+noexcept variant with ASan and -fno-exceptions.

  Multilibs.push_back(Multilib("asan+noexcept", {}, {}, 3)

                          .flag("+fsanitize=address")

                          .flag("-fexceptions")

                          .flag("+fno-exceptions"));

  Multilibs.FilterOut([&](const Multilib &M) {

    std::vector<std::string> RD = FilePaths(M);

    return std::all_of(RD.begin(), RD.end(), [&](std::string P) {

      return !getVFS().exists(P);

    });

  });

  Multilib::flags_list Flags;

  addMultilibFlag(

      Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions, true),

      "fexceptions", Flags);

  addMultilibFlag(getSanitizerArgs().needsAsanRt(), "fsanitize=address", Flags);

  Multilibs.setFilePathsCallback(FilePaths);

  if (Multilibs.select(Flags, SelectedMultilib))

    if (!SelectedMultilib.isDefault())

      if (const auto &PathsCallback = Multilibs.filePathsCallback())

        for (const auto &Path : PathsCallback(SelectedMultilib))

          // Prepend the multilib path to ensure it takes the precedence.

          getFilePaths().insert(getFilePaths().begin(), Path);

}

std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,

                                                 types::ID InputType) const {

  llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));

  return Triple.str();

}

Tool *Fuchsia::buildLinker() const {

  return new tools::fuchsia::Linker(*this);

}

ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(

    const ArgList &Args) const {

  if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {

    StringRef Value = A->getValue();

    if (Value != "compiler-rt")

      getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)

          << A->getAsString(Args);

  }

  return ToolChain::RLT_CompilerRT;

}

ToolChain::CXXStdlibType

Fuchsia::GetCXXStdlibType(const ArgList &Args) const {

  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {

    StringRef Value = A->getValue();

    if (Value != "libc++")

      getDriver().Diag(diag::err_drv_invalid_stdlib_name)

        << A->getAsString(Args);

  }

  return ToolChain::CST_Libcxx;

}

void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,

                                    ArgStringList &CC1Args,

                                    Action::OffloadKind) const {

  if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,

                          options::OPT_fno_use_init_array, true))

    CC1Args.push_back("-fno-use-init-array");

}

void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,

                                        ArgStringList &CC1Args) const {

  const Driver &D = getDriver();

  if (DriverArgs.hasArg(options::OPT_nostdinc))

    return;

  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {

    SmallString<128> P(D.ResourceDir);

    llvm::sys::path::append(P, "include");

    addSystemInclude(DriverArgs, CC1Args, P);

  }

  if (DriverArgs.hasArg(options::OPT_nostdlibinc))

    return;

  // Check for configure-time C include directories.

  StringRef CIncludeDirs(C_INCLUDE_DIRS);

  if (CIncludeDirs != "") {

    SmallVector<StringRef, 5> dirs;

    CIncludeDirs.split(dirs, ":");

    for (StringRef dir : dirs) {

      StringRef Prefix =

          llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";

      addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);

    }

    return;

  }

  if (!D.SysRoot.empty()) {

    SmallString<128> P(D.SysRoot);

    llvm::sys::path::append(P, "include");

    addExternCSystemInclude(DriverArgs, CC1Args, P.str());

  }

}

void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,

                                           ArgStringList &CC1Args) const {

  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||

      DriverArgs.hasArg(options::OPT_nostdincxx))

    return;

  switch (GetCXXStdlibType(DriverArgs)) {

  case ToolChain::CST_Libcxx: {

    SmallString<128> P(getDriver().Dir);

    llvm::sys::path::append(P, "..", "include", "c++", "v1");

    addSystemInclude(DriverArgs, CC1Args, P.str());

    break;

  }

  default:

    llvm_unreachable("invalid stdlib name");

  }

}

void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,

                                  ArgStringList &CmdArgs) const {

  switch (GetCXXStdlibType(Args)) {

  case ToolChain::CST_Libcxx:

    CmdArgs.push_back("-lc++");

    break;

  case ToolChain::CST_Libstdcxx:

    llvm_unreachable("invalid stdlib name");

  }

}

SanitizerMask Fuchsia::getSupportedSanitizers() const {

  SanitizerMask Res = ToolChain::getSupportedSanitizers();

  Res |= SanitizerKind::Address;

  Res |= SanitizerKind::PointerCompare;

  Res |= SanitizerKind::PointerSubtract;

  Res |= SanitizerKind::Fuzzer;

  Res |= SanitizerKind::FuzzerNoLink;

  Res |= SanitizerKind::Leak;

  Res |= SanitizerKind::SafeStack;

  Res |= SanitizerKind::Scudo;

  return Res;

}

SanitizerMask Fuchsia::getDefaultSanitizers() const {

  SanitizerMask Res;

  switch (getTriple().getArch()) {

  case llvm::Triple::aarch64:

    Res |= SanitizerKind::ShadowCallStack;

    break;

  case llvm::Triple::x86_64:

    Res |= SanitizerKind::SafeStack;

    break;

  default:

    // TODO: Enable SafeStack on RISC-V once tested.

    break;

  }

  return Res;

}