Move the decision about the kind of CGCXXABI to make inside

the family-specific files.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173530 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGCXXABI.h

@@ -296,9 +296,12 @@ public:
                                   llvm::Constant *addr);
 };
 
-/// Creates an instance of a C++ ABI class.
-CGCXXABI *CreateARMCXXABI(CodeGenModule &CGM);
+// Create an instance of a C++ ABI class:
+
+/// Creates an Itanium-family ABI.
 CGCXXABI *CreateItaniumCXXABI(CodeGenModule &CGM);
+
+/// Creates a Microsoft-family ABI.
 CGCXXABI *CreateMicrosoftCXXABI(CodeGenModule &CGM);
 
 }

lib/CodeGen/CodeGenModule.cpp

@@ -53,12 +53,12 @@ static const char AnnotationSection[] = "llvm.metadata";
 
 static CGCXXABI &createCXXABI(CodeGenModule &CGM) {
   switch (CGM.getContext().getTargetInfo().getCXXABI().getKind()) {
-  // For IR-generation purposes, there's no significant difference
-  // between the ARM and iOS ABIs.
-  case TargetCXXABI::GenericARM: return *CreateARMCXXABI(CGM);
-  case TargetCXXABI::iOS: return *CreateARMCXXABI(CGM);
-  case TargetCXXABI::GenericItanium: return *CreateItaniumCXXABI(CGM);
-  case TargetCXXABI::Microsoft: return *CreateMicrosoftCXXABI(CGM);
+  case TargetCXXABI::GenericARM:
+  case TargetCXXABI::iOS:
+  case TargetCXXABI::GenericItanium:
+    return *CreateItaniumCXXABI(CGM);
+  case TargetCXXABI::Microsoft:
+    return *CreateMicrosoftCXXABI(CGM);
   }
 
   llvm_unreachable("invalid C++ ABI kind");

lib/CodeGen/ItaniumCXXABI.cpp

@@ -174,11 +174,20 @@ private:
 }
 
 CodeGen::CGCXXABI *CodeGen::CreateItaniumCXXABI(CodeGenModule &CGM) {
-  return new ItaniumCXXABI(CGM);
-}
+  switch (CGM.getContext().getTargetInfo().getCXXABI().getKind()) {
+  // For IR-generation purposes, there's no significant difference
+  // between the ARM and iOS ABIs.
+  case TargetCXXABI::GenericARM:
+  case TargetCXXABI::iOS:
+    return new ARMCXXABI(CGM);
 
-CodeGen::CGCXXABI *CodeGen::CreateARMCXXABI(CodeGenModule &CGM) {
-  return new ARMCXXABI(CGM);
+  case TargetCXXABI::GenericItanium:
+    return new ItaniumCXXABI(CGM);
+
+  case TargetCXXABI::Microsoft:
+    llvm_unreachable("Microsoft ABI is not Itanium-based");
+  }
+  llvm_unreachable("bad ABI kind");
 }
 
 llvm::Type *