IRgen: Add a stub class for generating ABI-specific C++ code.

This class only supports name mangling (which is apparently used during C/ObjC
codegen). For now only the Itanium C++ ABI is supported. Patches to add a
second C++ ABI are forthcoming.

llvm-svn: 104630

clang/lib/CodeGen/CodeGenModule.cpp

@@ -48,7 +48,7 @@ CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
     Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M),
     TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags),
     Types(C, M, TD, getTargetCodeGenInfo().getABIInfo()),
-    MangleCtx(C, diags), VTables(*this), Runtime(0),
+    VTables(*this), Runtime(0), ABI(0),
     CFConstantStringClassRef(0),
     NSConstantStringClassRef(0),
     VMContext(M.getContext()) {
@@ -62,12 +62,17 @@ CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
   else
     Runtime = CreateMacObjCRuntime(*this);
 
+  if (!Features.CPlusPlus)
+    ABI = 0;
+  else createCXXABI();
+
   // If debug info generation is enabled, create the CGDebugInfo object.
   DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0;
 }
 
 CodeGenModule::~CodeGenModule() {
   delete Runtime;
+  delete ABI;
   delete DebugInfo;
 }
 
@@ -80,6 +85,11 @@ void CodeGenModule::createObjCRuntime() {
     Runtime = CreateMacObjCRuntime(*this);
 }
 
+void CodeGenModule::createCXXABI() {
+  // For now, just create an Itanium ABI.
+  ABI = CreateItaniumCXXABI(*this);
+}
+
 void CodeGenModule::Release() {
   EmitDeferred();
   EmitCXXGlobalInitFunc();