This patch adds missing pieces to clang, including the PS4 toolchain

definition, added warnings, PS4 defaults, and Driver changes needed for
our compiler.

A patch by Filipe Cabecinhas, Pierre Gousseau and Katya Romanova!

Differential Revision: http://reviews.llvm.org/D11279

llvm-svn: 248546

5 files changed, 456 insertions, 7 deletions

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 0c0421321e5..327f8951ea8 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -2254,6 +2254,9 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
     case llvm::Triple::CUDA:
       TC = new toolchains::CudaToolChain(*this, Target, Args);
       break;
+    case llvm::Triple::PS4:
+      TC = new toolchains::PS4CPU(*this, Target, Args);
+      break;
     default:
       // Of these targets, Hexagon is the only one that might have
       // an OS of Linux, in which case it got handled above already.
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 26e7ca659a2..a7ec7c6999a 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -4065,3 +4065,69 @@ void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
                          options::OPT_fno_use_init_array, true))
     CC1Args.push_back("-fuse-init-array");
 }
+
+PS4CPU::PS4CPU(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+    : Generic_ELF(D, Triple, Args) {
+  if (Args.hasArg(options::OPT_static))
+    D.Diag(diag::err_drv_unsupported_opt_for_target) << "-static" << "PS4";
+
+  // Determine where to find the PS4 libraries. We use SCE_PS4_SDK_DIR
+  // if it exists; otherwise use the driver's installation path, which
+  // should be <SDK_DIR>/host_tools/bin.
+  const char *EnvValue = getenv("SCE_PS4_SDK_DIR");
+  if (EnvValue && !llvm::sys::fs::exists(EnvValue))
+    getDriver().Diag(clang::diag::warn_drv_ps4_sdk_dir) << EnvValue;
+
+  std::string PS4SDKDir = (EnvValue ? EnvValue : getDriver().Dir + "/../..");
+
+  // Report a warning if we can't find the include or lib directories from
+  // the SDK.
+  // If -isysroot was passed, use that as the SDK base path.
+  std::string PrefixDir;
+  if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
+    PrefixDir = A->getValue();
+    if (!llvm::sys::fs::exists(PrefixDir))
+      getDriver().Diag(clang::diag::warn_missing_sysroot) << PrefixDir;
+  } else
+    PrefixDir = PS4SDKDir;
+
+  std::string PS4SDKIncludeDir = PrefixDir + "/target/include";
+  if (!Args.hasArg(options::OPT_nostdinc) &&
+      !Args.hasArg(options::OPT_nostdlibinc) &&
+      !Args.hasArg(options::OPT_isysroot) &&
+      !Args.hasArg(options::OPT__sysroot_EQ) &&
+      !llvm::sys::fs::exists(PS4SDKIncludeDir)) {
+    getDriver().Diag(clang::diag::warn_drv_unable_to_find_directory_expected)
+        << "PS4 system headers" << PS4SDKIncludeDir;
+  }
+
+  std::string PS4SDKLibDir = PS4SDKDir + "/target/lib";
+  if (!Args.hasArg(options::OPT_nostdlib) &&
+      !Args.hasArg(options::OPT_nodefaultlibs) &&
+      !Args.hasArg(options::OPT__sysroot_EQ) && !Args.hasArg(options::OPT_E) &&
+      !Args.hasArg(options::OPT_c) && !Args.hasArg(options::OPT_S) &&
+      !Args.hasArg(options::OPT_emit_ast) &&
+      !llvm::sys::fs::exists(PS4SDKLibDir)) {
+    getDriver().Diag(clang::diag::warn_drv_unable_to_find_directory_expected)
+        << "PS4 system libraries" << PS4SDKLibDir;
+    return;
+  }
+  getFilePaths().push_back(PS4SDKLibDir);
+}
+
+Tool *PS4CPU::buildAssembler() const {
+  return new tools::PS4cpu::Assemble(*this);
+}
+
+Tool *PS4CPU::buildLinker() const { return new tools::PS4cpu::Link(*this); }
+
+bool PS4CPU::isPICDefault() const { return true; }
+
+bool PS4CPU::HasNativeLLVMSupport() const { return true; }
+
+SanitizerMask PS4CPU::getSupportedSanitizers() const {
+  SanitizerMask Res = ToolChain::getSupportedSanitizers();
+  Res |= SanitizerKind::Address;
+  Res |= SanitizerKind::Vptr;
+  return Res;
+}
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index 55b2bf90955..9e7e56719e3 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -1002,6 +1002,27 @@ private:
                              llvm::opt::ArgStringList &CC1Args) const override;
 };
 
+class LLVM_LIBRARY_VISIBILITY PS4CPU : public Generic_ELF {
+public:
+  PS4CPU(const Driver &D, const llvm::Triple &Triple,
+         const llvm::opt::ArgList &Args);
+
+  bool IsMathErrnoDefault() const override { return false; }
+  bool IsObjCNonFragileABIDefault() const override { return true; }
+  bool HasNativeLLVMSupport() const override;
+  bool isPICDefault() const override;
+
+  unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const override {
+    return 2; // SSPStrong
+  }
+
+  SanitizerMask getSupportedSanitizers() const override;
+
+protected:
+  Tool *buildAssembler() const override;
+  Tool *buildLinker() const override;
+};
+
 } // end namespace toolchains
 } // end namespace driver
 } // end namespace clang
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index e13144ffebf..28c4ba61c95 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -3102,15 +3102,23 @@ ParsePICArgs(const ToolChain &ToolChain, const llvm::Triple &Triple,
             O.matches(options::OPT_fPIE) || O.matches(options::OPT_fPIC);
       } else {
         PIE = PIC = false;
+        if (Triple.isPS4CPU()) {
+          Arg *ModelArg = Args.getLastArg(options::OPT_mcmodel_EQ);
+          StringRef Model = ModelArg ? ModelArg->getValue() : "";
+          if (Model != "kernel") {
+            PIC = true;
+            ToolChain.getDriver().Diag(diag::warn_drv_ps4_force_pic)
+                << LastPICArg->getSpelling();
+          }
+        }
       }
     }
   }
 
-  // Introduce a Darwin-specific hack. If the default is PIC, but the
-  // PIC level would've been set to level 1, force it back to level 2
-  // PIC instead. This matches the behavior of Darwin GCC (based on
-  // chandlerc's informal testing in 2012).
-  if (PIC && ToolChain.getTriple().isOSDarwin())
+  // Introduce a Darwin and PS4-specific hack. If the default is PIC, but the
+  // PIC level would've been set to level 1, force it back to level 2 PIC
+  // instead.
+  if (PIC && (ToolChain.getTriple().isOSDarwin() || Triple.isPS4CPU()))
     IsPICLevelTwo |= ToolChain.isPICDefault();
 
   // This kernel flags are a trump-card: they will disable PIC/PIE
@@ -3182,6 +3190,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   bool IsWindowsCygnus =
       getToolChain().getTriple().isWindowsCygwinEnvironment();
   bool IsWindowsMSVC = getToolChain().getTriple().isWindowsMSVCEnvironment();
+  bool IsPS4CPU = getToolChain().getTriple().isPS4CPU();
 
   // Check number of inputs for sanity. We need at least one input.
   assert(Inputs.size() >= 1 && "Must have at least one input.");
@@ -3823,8 +3832,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   // We ignore flags -gstrict-dwarf and -grecord-gcc-switches for now.
   Args.ClaimAllArgs(options::OPT_g_flags_Group);
+
+  // PS4 defaults to no column info
   if (Args.hasFlag(options::OPT_gcolumn_info, options::OPT_gno_column_info,
-                   /*Default*/ true))
+                   /*Default=*/ !IsPS4CPU))
     CmdArgs.push_back("-dwarf-column-info");
 
   // FIXME: Move backend command line options to the module.
@@ -3851,7 +3862,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   // -gdwarf-aranges turns on the emission of the aranges section in the
   // backend.
-  if (Args.hasArg(options::OPT_gdwarf_aranges)) {
+  // Always enabled on the PS4.
+  if (Args.hasArg(options::OPT_gdwarf_aranges) || IsPS4CPU) {
     CmdArgs.push_back("-backend-option");
     CmdArgs.push_back("-generate-arange-section");
   }
@@ -9846,3 +9858,320 @@ void tools::Myriad::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   C.addCommand(llvm::make_unique<Command>(JA, *this, Args.MakeArgString(Exec),
                                           CmdArgs, Inputs));
 }
+
+void PS4cpu::Assemble::ConstructJob(Compilation &C, const JobAction &JA,
+                                    const InputInfo &Output,
+                                    const InputInfoList &Inputs,
+                                    const ArgList &Args,
+                                    const char *LinkingOutput) const {
+  claimNoWarnArgs(Args);
+  ArgStringList CmdArgs;
+
+  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
+
+  CmdArgs.push_back("-o");
+  CmdArgs.push_back(Output.getFilename());
+
+  const char *Exec =
+      Args.MakeArgString(getToolChain().GetProgramPath("ps4-as"));
+  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
+}
+
+static void AddPS4ProfileRT(const ToolChain &TC, const ArgList &Args,
+                            ArgStringList &CmdArgs) {
+  if (!(Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
+                     false) ||
+        Args.hasArg(options::OPT_fprofile_generate) ||
+        Args.hasArg(options::OPT_fprofile_instr_generate) ||
+        Args.hasArg(options::OPT_fcreate_profile) ||
+        Args.hasArg(options::OPT_coverage)))
+    return;
+
+  assert(TC.getTriple().isPS4CPU() &&
+         "Profiling libraries are only implemented for the PS4 CPU");
+  CmdArgs.push_back("-lclang_rt.profile-x86_64");
+}
+
+static void AddPS4SanitizerArgs(const ToolChain &TC, ArgStringList &CmdArgs) {
+  const SanitizerArgs &SanArgs = TC.getSanitizerArgs();
+  if (SanArgs.needsUbsanRt()) {
+    CmdArgs.push_back("-lSceDbgUBSanitizer_stub_weak");
+  }
+  if (SanArgs.needsAsanRt()) {
+    CmdArgs.push_back("-lSceDbgAddressSanitizer_stub_weak");
+  }
+}
+
+static void ConstructPS4LinkJob(const Tool &T, Compilation &C,
+                                const JobAction &JA, const InputInfo &Output,
+                                const InputInfoList &Inputs,
+                                const ArgList &Args,
+                                const char *LinkingOutput) {
+  const toolchains::FreeBSD &ToolChain =
+      static_cast<const toolchains::FreeBSD &>(T.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);
+
+  if (!D.SysRoot.empty())
+    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
+
+  if (Args.hasArg(options::OPT_pie))
+    CmdArgs.push_back("-pie");
+
+  if (Args.hasArg(options::OPT_rdynamic))
+    CmdArgs.push_back("-export-dynamic");
+  if (Args.hasArg(options::OPT_shared))
+    CmdArgs.push_back("--oformat=so");
+
+  if (Output.isFilename()) {
+    CmdArgs.push_back("-o");
+    CmdArgs.push_back(Output.getFilename());
+  } else {
+    assert(Output.isNothing() && "Invalid output.");
+  }
+
+  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_r);
+
+  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
+    CmdArgs.push_back("--no-demangle");
+
+  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs);
+
+  if (Args.hasArg(options::OPT_pthread)) {
+    CmdArgs.push_back("-lpthread");
+  }
+
+  AddPS4ProfileRT(ToolChain, Args, CmdArgs);
+  AddPS4SanitizerArgs(ToolChain, CmdArgs);
+
+  const char *Exec = Args.MakeArgString(ToolChain.GetProgramPath("ps4-ld"));
+
+  C.addCommand(llvm::make_unique<Command>(JA, T, Exec, CmdArgs, Inputs));
+}
+
+static void ConstructGoldLinkJob(const Tool &T, Compilation &C,
+                                 const JobAction &JA, const InputInfo &Output,
+                                 const InputInfoList &Inputs,
+                                 const ArgList &Args,
+                                 const char *LinkingOutput) {
+  const toolchains::FreeBSD &ToolChain =
+      static_cast<const toolchains::FreeBSD &>(T.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);
+
+  if (!D.SysRoot.empty())
+    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
+
+  if (Args.hasArg(options::OPT_pie))
+    CmdArgs.push_back("-pie");
+
+  if (Args.hasArg(options::OPT_static)) {
+    CmdArgs.push_back("-Bstatic");
+  } else {
+    if (Args.hasArg(options::OPT_rdynamic))
+      CmdArgs.push_back("-export-dynamic");
+    CmdArgs.push_back("--eh-frame-hdr");
+    if (Args.hasArg(options::OPT_shared)) {
+      CmdArgs.push_back("-Bshareable");
+    } else {
+      CmdArgs.push_back("-dynamic-linker");
+      CmdArgs.push_back("/libexec/ld-elf.so.1");
+    }
+    CmdArgs.push_back("--enable-new-dtags");
+  }
+
+  if (Output.isFilename()) {
+    CmdArgs.push_back("-o");
+    CmdArgs.push_back(Output.getFilename());
+  } else {
+    assert(Output.isNothing() && "Invalid output.");
+  }
+
+  if (!Args.hasArg(options::OPT_nostdlib) &&
+      !Args.hasArg(options::OPT_nostartfiles)) {
+    const char *crt1 = NULL;
+    if (!Args.hasArg(options::OPT_shared)) {
+      if (Args.hasArg(options::OPT_pg))
+        crt1 = "gcrt1.o";
+      else if (Args.hasArg(options::OPT_pie))
+        crt1 = "Scrt1.o";
+      else
+        crt1 = "crt1.o";
+    }
+    if (crt1)
+      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
+
+    CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
+
+    const char *crtbegin = NULL;
+    if (Args.hasArg(options::OPT_static))
+      crtbegin = "crtbeginT.o";
+    else if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_pie))
+      crtbegin = "crtbeginS.o";
+    else
+      crtbegin = "crtbegin.o";
+
+    CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
+  }
+
+  Args.AddAllArgs(CmdArgs, options::OPT_L);
+
+  const ToolChain::path_list Paths = ToolChain.getFilePaths();
+  for (ToolChain::path_list::const_iterator i = Paths.begin(), e = Paths.end();
+       i != e; ++i)
+    CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + *i));
+
+  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_r);
+
+  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
+    CmdArgs.push_back("--no-demangle");
+
+  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs);
+
+  if (!Args.hasArg(options::OPT_nostdlib) &&
+      !Args.hasArg(options::OPT_nodefaultlibs)) {
+    // For PS4, we always want to pass libm, libstdc++ and libkernel
+    // libraries for both C and C++ compilations.
+    CmdArgs.push_back("-lkernel");
+    if (D.CCCIsCXX()) {
+      ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
+      if (Args.hasArg(options::OPT_pg))
+        CmdArgs.push_back("-lm_p");
+      else
+        CmdArgs.push_back("-lm");
+    }
+    // FIXME: For some reason GCC passes -lgcc and -lgcc_s before adding
+    // the default system libraries. Just mimic this for now.
+    if (Args.hasArg(options::OPT_pg))
+      CmdArgs.push_back("-lgcc_p");
+    else
+      CmdArgs.push_back("-lcompiler_rt");
+    if (Args.hasArg(options::OPT_static)) {
+      CmdArgs.push_back("-lstdc++");
+    } else if (Args.hasArg(options::OPT_pg)) {
+      CmdArgs.push_back("-lgcc_eh_p");
+    } else {
+      CmdArgs.push_back("--as-needed");
+      CmdArgs.push_back("-lstdc++");
+      CmdArgs.push_back("--no-as-needed");
+    }
+
+    if (Args.hasArg(options::OPT_pthread)) {
+      if (Args.hasArg(options::OPT_pg))
+        CmdArgs.push_back("-lpthread_p");
+      else
+        CmdArgs.push_back("-lpthread");
+    }
+
+    if (Args.hasArg(options::OPT_pg)) {
+      if (Args.hasArg(options::OPT_shared))
+        CmdArgs.push_back("-lc");
+      else {
+        if (Args.hasArg(options::OPT_static)) {
+          CmdArgs.push_back("--start-group");
+          CmdArgs.push_back("-lc_p");
+          CmdArgs.push_back("-lpthread_p");
+          CmdArgs.push_back("--end-group");
+        } else {
+          CmdArgs.push_back("-lc_p");
+        }
+      }
+      CmdArgs.push_back("-lgcc_p");
+    } else {
+      if (Args.hasArg(options::OPT_static)) {
+        CmdArgs.push_back("--start-group");
+        CmdArgs.push_back("-lc");
+        CmdArgs.push_back("-lpthread");
+        CmdArgs.push_back("--end-group");
+      } else {
+        CmdArgs.push_back("-lc");
+      }
+      CmdArgs.push_back("-lcompiler_rt");
+    }
+
+    if (Args.hasArg(options::OPT_static)) {
+      CmdArgs.push_back("-lstdc++");
+    } else if (Args.hasArg(options::OPT_pg)) {
+      CmdArgs.push_back("-lgcc_eh_p");
+    } else {
+      CmdArgs.push_back("--as-needed");
+      CmdArgs.push_back("-lstdc++");
+      CmdArgs.push_back("--no-as-needed");
+    }
+  }
+
+  if (!Args.hasArg(options::OPT_nostdlib) &&
+      !Args.hasArg(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")));
+  }
+
+  AddPS4ProfileRT(ToolChain, Args, CmdArgs);
+  AddPS4SanitizerArgs(ToolChain, CmdArgs);
+
+  const char *Exec =
+#ifdef LLVM_ON_WIN32
+      Args.MakeArgString(ToolChain.GetProgramPath("ps4-ld.gold.exe"));
+#else
+      Args.MakeArgString(ToolChain.GetProgramPath("ps4-ld"));
+#endif
+
+  C.addCommand(llvm::make_unique<Command>(JA, T, Exec, CmdArgs, Inputs));
+}
+
+void PS4cpu::Link::ConstructJob(Compilation &C, const JobAction &JA,
+                                const InputInfo &Output,
+                                const InputInfoList &Inputs,
+                                const ArgList &Args,
+                                const char *LinkingOutput) const {
+  const toolchains::FreeBSD &ToolChain =
+      static_cast<const toolchains::FreeBSD &>(getToolChain());
+  const Driver &D = ToolChain.getDriver();
+  bool PS4Linker;
+  StringRef LinkerOptName;
+  if (const Arg *A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
+    LinkerOptName = A->getValue();
+    if (LinkerOptName != "ps4" && LinkerOptName != "gold")
+      D.Diag(diag::err_drv_unsupported_linker) << LinkerOptName;
+  }
+
+  if (LinkerOptName == "gold")
+    PS4Linker = false;
+  else if (LinkerOptName == "ps4")
+    PS4Linker = true;
+  else
+    PS4Linker = !Args.hasArg(options::OPT_shared);
+
+  if (PS4Linker)
+    ConstructPS4LinkJob(*this, C, JA, Output, Inputs, Args, LinkingOutput);
+  else
+    ConstructGoldLinkJob(*this, C, JA, Output, Inputs, Args, LinkingOutput);
+}
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 3f63aface9f..798e6c4f6da 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -827,6 +827,36 @@ public:
 };
 } // end namespace Myriad
 
+namespace PS4cpu {
+class LLVM_LIBRARY_VISIBILITY Assemble : public Tool {
+public:
+  Assemble(const ToolChain &TC)
+      : Tool("PS4cpu::Assemble", "assembler", TC, RF_Full) {}
+
+  virtual bool hasIntegratedCPP() const { return false; }
+
+  virtual void ConstructJob(Compilation &C, const JobAction &JA,
+                            const InputInfo &Output,
+                            const InputInfoList &Inputs,
+                            const llvm::opt::ArgList &TCArgs,
+                            const char *LinkingOutput) const;
+};
+
+class LLVM_LIBRARY_VISIBILITY Link : public Tool {
+public:
+  Link(const ToolChain &TC) : Tool("PS4cpu::Link", "linker", TC, RF_Full) {}
+
+  virtual bool hasIntegratedCPP() const { return false; }
+  virtual bool isLinkJob() const { return true; }
+
+  virtual void ConstructJob(Compilation &C, const JobAction &JA,
+                            const InputInfo &Output,
+                            const InputInfoList &Inputs,
+                            const llvm::opt::ArgList &TCArgs,
+                            const char *LinkingOutput) const;
+};
+} // end namespace PS4cpu
+
 } // end namespace tools
 } // end namespace driver
 } // end namespace clang