ARM64: initial clang support commit.

This adds Clang support for the ARM64 backend. There are definitely
still some rough edges, so please bring up any issues you see with
this patch.

As with the LLVM commit though, we think it'll be more useful for
merging with AArch64 from within the tree.

llvm-svn: 205100

4 files changed, 98 insertions, 16 deletions

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 3cf3311de5b..c1f7cccaac7 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -399,7 +399,8 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
     // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
     // it never went into the SDK.
     // Linking against libgcc_s.1 isn't needed for iOS 5.0+
-    if (isIPhoneOSVersionLT(5, 0) && !isTargetIOSSimulator())
+    if (isIPhoneOSVersionLT(5, 0) && !isTargetIOSSimulator() &&
+        getTriple().getArch() != llvm::Triple::arm64)
       CmdArgs.push_back("-lgcc_s.1");
 
     // We currently always need a static runtime library for iOS.
@@ -498,7 +499,8 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
     // go ahead as assume we're targeting iOS.
     StringRef MachOArchName = getMachOArchName(Args);
     if (OSXTarget.empty() && iOSTarget.empty() &&
-        (MachOArchName == "armv7" || MachOArchName == "armv7s"))
+        (MachOArchName == "armv7" || MachOArchName == "armv7s" ||
+         MachOArchName == "arm64"))
         iOSTarget = iOSVersionMin;
 
     // Handle conflicting deployment targets
@@ -517,6 +519,7 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
     // default platform.
     if (!OSXTarget.empty() && !iOSTarget.empty()) {
       if (getTriple().getArch() == llvm::Triple::arm ||
+          getTriple().getArch() == llvm::Triple::arm64 ||
           getTriple().getArch() == llvm::Triple::thumb)
         OSXTarget = "";
       else
@@ -652,6 +655,7 @@ void DarwinClang::AddCCKextLibArgs(const ArgList &Args,
 
   // Use the newer cc_kext for iOS ARM after 6.0.
   if (!isTargetIPhoneOS() || isTargetIOSSimulator() ||
+      getTriple().getArch() == llvm::Triple::arm64 ||
       !isIPhoneOSVersionLT(6, 0)) {
     llvm::sys::path::append(P, "libclang_rt.cc_kext.a");
   } else {
@@ -879,6 +883,10 @@ DerivedArgList *MachO::TranslateArgs(const DerivedArgList &Args,
     else if (Name == "armv7s")
       DAL->AddJoinedArg(0, MArch, "armv7s");
 
+    else if (Name == "arm64")
+      DAL->AddJoinedArg(0, MArch, "arm64");
+    else if (Name == "armv8")
+      DAL->AddJoinedArg(0, MArch, "arm64");
   }
 
   return DAL;
@@ -919,7 +927,8 @@ DerivedArgList *Darwin::TranslateArgs(const DerivedArgList &Args,
   // FIXME: It would be far better to avoid inserting those -static arguments,
   // but we can't check the deployment target in the translation code until
   // it is set here.
-  if (isTargetIOSBased() && !isIPhoneOSVersionLT(6, 0)) {
+  if (isTargetIOSBased() && !isIPhoneOSVersionLT(6, 0) &&
+      getTriple().getArch() != llvm::Triple::arm64) {
     for (ArgList::iterator it = DAL->begin(), ie = DAL->end(); it != ie; ) {
       Arg *A = *it;
       ++it;
@@ -984,7 +993,8 @@ bool MachO::isPIEDefault() const {
 }
 
 bool MachO::isPICDefaultForced() const {
-  return getArch() == llvm::Triple::x86_64;
+  return (getArch() == llvm::Triple::x86_64 ||
+          getArch() == llvm::Triple::arm64);
 }
 
 bool MachO::SupportsProfiling() const {
@@ -1073,7 +1083,9 @@ void Darwin::addStartObjectFileArgs(const llvm::opt::ArgList &Args,
           if (isTargetIOSSimulator()) {
             ; // iOS simulator does not need crt1.o.
           } else if (isTargetIPhoneOS()) {
-            if (isIPhoneOSVersionLT(3, 1))
+            if (getArch() == llvm::Triple::arm64)
+              ; // iOS does not need any crt1 files for arm64
+            else if (isIPhoneOSVersionLT(3, 1))
               CmdArgs.push_back("-lcrt1.o");
             else if (isIPhoneOSVersionLT(6, 0))
               CmdArgs.push_back("-lcrt1.3.1.o");
@@ -1386,6 +1398,7 @@ bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
   };
 
   switch (TargetTriple.getArch()) {
+  case llvm::Triple::arm64:
   case llvm::Triple::aarch64:
     LibDirs.append(AArch64LibDirs,
                    AArch64LibDirs + llvm::array_lengthof(AArch64LibDirs));
@@ -2090,6 +2103,7 @@ bool Generic_GCC::IsIntegratedAssemblerDefault() const {
          getTriple().getArch() == llvm::Triple::x86_64 ||
          getTriple().getArch() == llvm::Triple::aarch64 ||
          getTriple().getArch() == llvm::Triple::aarch64_be ||
+         getTriple().getArch() == llvm::Triple::arm64 ||
          getTriple().getArch() == llvm::Triple::arm ||
          getTriple().getArch() == llvm::Triple::armeb ||
          getTriple().getArch() == llvm::Triple::thumb ||
@@ -2099,12 +2113,13 @@ bool Generic_GCC::IsIntegratedAssemblerDefault() const {
 void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
                                         ArgStringList &CC1Args) const {
   const Generic_GCC::GCCVersion &V = GCCInstallation.getVersion();
-  bool UseInitArrayDefault = 
+  bool UseInitArrayDefault =
       getTriple().getArch() == llvm::Triple::aarch64 ||
       getTriple().getArch() == llvm::Triple::aarch64_be ||
-      (getTriple().getOS() == llvm::Triple::Linux && (
-         !V.isOlderThan(4, 7, 0) ||
-         getTriple().getEnvironment() == llvm::Triple::Android));
+      getTriple().getArch() == llvm::Triple::arm64 ||
+      (getTriple().getOS() == llvm::Triple::Linux &&
+       (!V.isOlderThan(4, 7, 0) ||
+        getTriple().getEnvironment() == llvm::Triple::Android));
 
   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
                          options::OPT_fno_use_init_array,
@@ -2840,6 +2855,7 @@ static std::string getMultiarchTriple(const llvm::Triple &TargetTriple,
     if (llvm::sys::fs::exists(SysRoot + "/lib/x86_64-linux-gnu"))
       return "x86_64-linux-gnu";
     return TargetTriple.str();
+  case llvm::Triple::arm64:
   case llvm::Triple::aarch64:
     if (llvm::sys::fs::exists(SysRoot + "/lib/aarch64-linux-gnu"))
       return "aarch64-linux-gnu";
@@ -3216,8 +3232,9 @@ void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
     MultiarchIncludeDirs = X86_64MultiarchIncludeDirs;
   } else if (getTriple().getArch() == llvm::Triple::x86) {
     MultiarchIncludeDirs = X86MultiarchIncludeDirs;
-  } else if ((getTriple().getArch() == llvm::Triple::aarch64) ||
-             (getTriple().getArch() == llvm::Triple::aarch64_be)) {
+  } else if (getTriple().getArch() == llvm::Triple::aarch64 ||
+             getTriple().getArch() == llvm::Triple::aarch64_be ||
+             getTriple().getArch() == llvm::Triple::arm64) {
     MultiarchIncludeDirs = AArch64MultiarchIncludeDirs;
   } else if (getTriple().getArch() == llvm::Triple::arm) {
     if (getTriple().getEnvironment() == llvm::Triple::GNUEABIHF)
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index ef90c2ab68d..ad4d4c15851 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -368,7 +368,8 @@ public:
                          llvm::opt::ArgStringList &CmdArgs) const override;
 
   bool isKernelStatic() const override {
-    return !isTargetIPhoneOS() || isIPhoneOSVersionLT(6, 0);
+    return !isTargetIPhoneOS() || isIPhoneOSVersionLT(6, 0) ||
+           getTriple().getArch() == llvm::Triple::arm64;
   }
 
 protected:
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 0c397584d93..f354d7c4070 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -471,6 +471,7 @@ static bool isSignedCharDefault(const llvm::Triple &Triple) {
 
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_be:
+  case llvm::Triple::arm64:
   case llvm::Triple::arm:
   case llvm::Triple::armeb:
   case llvm::Triple::ppc:
@@ -846,6 +847,59 @@ void Clang::AddARMTargetArgs(const ArgList &Args,
     }
 }
 
+/// getARM64TargetCPU - Get the (LLVM) name of the ARM64 cpu we are targeting.
+static std::string getARM64TargetCPU(const ArgList &Args) {
+  // If we have -mcpu=, use that.
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    StringRef MCPU = A->getValue();
+    // Handle -mcpu=native.
+    if (MCPU == "native")
+      return llvm::sys::getHostCPUName();
+    else
+      return MCPU;
+  }
+
+  // At some point, we may need to check -march here, but for now we only
+  // one arm64 architecture.
+
+  // Default to "cyclone" CPU.
+  return "cyclone";
+}
+
+void Clang::AddARM64TargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  std::string TripleStr = getToolChain().ComputeEffectiveClangTriple(Args);
+  llvm::Triple Triple(TripleStr);
+
+  if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true) ||
+      Args.hasArg(options::OPT_mkernel) ||
+      Args.hasArg(options::OPT_fapple_kext))
+    CmdArgs.push_back("-disable-red-zone");
+
+  if (!Args.hasFlag(options::OPT_mimplicit_float,
+                    options::OPT_mno_implicit_float, true))
+    CmdArgs.push_back("-no-implicit-float");
+
+  const char *ABIName = 0;
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
+    ABIName = A->getValue();
+  else if (Triple.isOSDarwin())
+    ABIName = "darwinpcs";
+  else
+    ABIName = "aapcs";
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName);
+
+  CmdArgs.push_back("-target-cpu");
+  CmdArgs.push_back(Args.MakeArgString(getARM64TargetCPU(Args)));
+
+  if (Args.hasArg(options::OPT_mstrict_align)) {
+    CmdArgs.push_back("-backend-option");
+    CmdArgs.push_back("-arm64-strict-align");
+  }
+}
+
 // Get CPU and ABI names. They are not independent
 // so we have to calculate them together.
 static void getMipsCPUAndABI(const ArgList &Args,
@@ -2325,8 +2379,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   // Note that these flags are trump-cards. Regardless of the order w.r.t. the
   // PIC or PIE options above, if these show up, PIC is disabled.
   llvm::Triple Triple(TripleStr);
-  if (KernelOrKext &&
-      (!Triple.isiOS() || Triple.isOSVersionLT(6)))
+  if (KernelOrKext && (!Triple.isiOS() || Triple.isOSVersionLT(6) ||
+                       Triple.getArch() == llvm::Triple::arm64))
     PIC = PIE = false;
   if (Args.hasArg(options::OPT_static))
     PIC = PIE = false;
@@ -2649,6 +2703,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     AddARMTargetArgs(Args, CmdArgs, KernelOrKext);
     break;
 
+  case llvm::Triple::arm64:
+    AddARM64TargetArgs(Args, CmdArgs);
+    break;
+
   case llvm::Triple::mips:
   case llvm::Triple::mipsel:
   case llvm::Triple::mips64:
@@ -4876,6 +4934,7 @@ const char *arm::getLLVMArchSuffixForARM(StringRef CPU) {
     .Case("cortex-m3", "v7m")
     .Case("cortex-m4", "v7em")
     .Case("swift", "v7s")
+    .Case("cyclone", "v8")
     .Cases("cortex-a53", "cortex-a57", "v8")
     .Default("");
 }
@@ -4910,6 +4969,7 @@ llvm::Triple::ArchType darwin::getArchTypeForMachOArchName(StringRef Str) {
     .Cases("arm", "armv4t", "armv5", "armv6", "armv6m", llvm::Triple::arm)
     .Cases("armv7", "armv7em", "armv7k", "armv7m", llvm::Triple::arm)
     .Cases("armv7s", "xscale", llvm::Triple::arm)
+    .Case("arm64", llvm::Triple::arm64)
     .Case("r600", llvm::Triple::r600)
     .Case("nvptx", llvm::Triple::nvptx)
     .Case("nvptx64", llvm::Triple::nvptx64)
@@ -6711,7 +6771,8 @@ static StringRef getLinuxDynamicLinker(const ArgList &Args,
   } else if (ToolChain.getArch() == llvm::Triple::x86 ||
              ToolChain.getArch() == llvm::Triple::sparc)
     return "/lib/ld-linux.so.2";
-  else if (ToolChain.getArch() == llvm::Triple::aarch64)
+  else if (ToolChain.getArch() == llvm::Triple::aarch64 ||
+           ToolChain.getArch() == llvm::Triple::arm64)
     return "/lib/ld-linux-aarch64.so.1";
   else if (ToolChain.getArch() == llvm::Triple::aarch64_be)
     return "/lib/ld-linux-aarch64_be.so.1";
@@ -6811,7 +6872,8 @@ void gnutools::Link::ConstructJob(Compilation &C, const JobAction &JA,
   CmdArgs.push_back("-m");
   if (ToolChain.getArch() == llvm::Triple::x86)
     CmdArgs.push_back("elf_i386");
-  else if (ToolChain.getArch() == llvm::Triple::aarch64)
+  else if (ToolChain.getArch() == llvm::Triple::aarch64 ||
+           ToolChain.getArch() == llvm::Triple::arm64)
     CmdArgs.push_back("aarch64linux");
   else if (ToolChain.getArch() == llvm::Triple::aarch64_be)
     CmdArgs.push_back("aarch64_be_linux");
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 069acdcf758..575c98842f2 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -54,6 +54,8 @@ using llvm::opt::ArgStringList;
     void AddARMTargetArgs(const llvm::opt::ArgList &Args,
                           llvm::opt::ArgStringList &CmdArgs,
                           bool KernelOrKext) const;
+    void AddARM64TargetArgs(const llvm::opt::ArgList &Args,
+                            llvm::opt::ArgStringList &CmdArgs) const;
     void AddMIPSTargetArgs(const llvm::opt::ArgList &Args,
                            llvm::opt::ArgStringList &CmdArgs) const;
     void AddR600TargetArgs(const llvm::opt::ArgList &Args,