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

1 files changed, 28 insertions, 11 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)