1 files changed, 347 insertions, 0 deletions
diff --git a/clang/lib/Driver/ToolChains/Fuchsia.cpp b/clang/lib/Driver/ToolChains/Fuchsia.cpp
new file mode 100644
index 000000000000..e7d38ff9f227
--- /dev/null
+++ b/clang/lib/Driver/ToolChains/Fuchsia.cpp
@@ -0,0 +1,347 @@
+//===--- 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);
+
+  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")) {
+    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))
+    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())
+      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.");
+    AddGoldPlugin(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);
+        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(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(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.getArchName() + "-" + Triple.getOSName()).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("-fuse-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::SafeStack;
+  Res |= SanitizerKind::Scudo;
+  return Res;
+}
+
+SanitizerMask Fuchsia::getDefaultSanitizers() const {
+  return SanitizerKind::SafeStack;
+}