First pass at abstracting out a class for the target C++ ABI.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/TargetInfo.cpp b/lib/Basic/TargetInfo.cpp
index 9cf04af..fe68a9d 100644
--- a/lib/Basic/TargetInfo.cpp
+++ b/lib/Basic/TargetInfo.cpp
@@ -84,7 +84,7 @@
   ComplexLongDoubleUsesFP2Ret = false;
 
   // Default to using the Itanium ABI.
-  CXXABI = CXXABI_Itanium;
+  TheCXXABI.set(TargetCXXABI::GenericItanium);
 
   // Default to an empty address space map.
   AddrSpaceMap = &DefaultAddrSpaceMap;
@@ -496,3 +496,17 @@
 
   return true;
 }
+
+bool TargetCXXABI::tryParse(llvm::StringRef name) {
+  const Kind unknown = static_cast<Kind>(-1);
+  Kind kind = llvm::StringSwitch<Kind>(name)
+    .Case("arm", GenericARM)
+    .Case("ios", iOS)
+    .Case("itanium", GenericItanium)
+    .Case("microsoft", Microsoft)
+    .Default(unknown);
+  if (kind == unknown) return false;
+
+  set(kind);
+  return true;
+}
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 084b6b3..b90d49e 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -3081,7 +3081,7 @@
     }
 
     // ARM targets default to using the ARM C++ ABI.
-    CXXABI = CXXABI_ARM;
+    TheCXXABI.set(TargetCXXABI::GenericARM);
 
     // ARM has atomics up to 8 bytes
     // FIXME: Set MaxAtomicInlineWidth if we have the feature v6e
@@ -3491,6 +3491,9 @@
     // iOS always has 64-bit atomic instructions.
     // FIXME: This should be based off of the target features in ARMTargetInfo.
     MaxAtomicInlineWidth = 64;
+
+    // Darwin on iOS uses a variant of the ARM C++ ABI.
+    TheCXXABI.set(TargetCXXABI::iOS);
   }
 };
 } // end anonymous namespace.