Slight cleanup, and fix for va_arg on architectures where va_list is a

struct.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62585 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGBuiltin.cpp

@@ -53,12 +53,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
   case Builtin::BI__builtin_stdarg_start:
   case Builtin::BI__builtin_va_start:
   case Builtin::BI__builtin_va_end: {
-    Value *ArgValue;
-    if (CGM.getContext().getBuiltinVaListType()->isArrayType()) {
-      ArgValue = EmitScalarExpr(E->getArg(0));
-    } else {
-      ArgValue = EmitLValue(E->getArg(0)).getAddress();
-    }
+    Value *ArgValue = EmitVAListRef(E->getArg(0));;
     const llvm::Type *DestType = 
       llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
     if (ArgValue->getType() != DestType)
@@ -70,14 +65,8 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
     return RValue::get(Builder.CreateCall(CGM.getIntrinsic(inst), ArgValue));
   }
   case Builtin::BI__builtin_va_copy: {
-    Value *DstPtr, *SrcPtr;
-    if (CGM.getContext().getBuiltinVaListType()->isArrayType()) {
-      DstPtr = EmitScalarExpr(E->getArg(0));
-      SrcPtr = EmitScalarExpr(E->getArg(1));
-    } else {
-      DstPtr = EmitLValue(E->getArg(0)).getAddress();
-      SrcPtr = EmitLValue(E->getArg(1)).getAddress();
-    }
+    Value *DstPtr = EmitVAListRef(E->getArg(0));
+    Value *SrcPtr = EmitVAListRef(E->getArg(1));
 
     const llvm::Type *Type = 
       llvm::PointerType::getUnqual(llvm::Type::Int8Ty);

lib/CodeGen/CGExprScalar.cpp

@@ -1286,7 +1286,7 @@ Value *ScalarExprEmitter::VisitOverloadExpr(OverloadExpr *E) {
 }
 
 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
-  llvm::Value *ArgValue = EmitLValue(VE->getSubExpr()).getAddress();
+  llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
 
   llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
 

lib/CodeGen/CodeGenFunction.cpp

@@ -460,3 +460,10 @@ llvm::Value *CodeGenFunction::EmitVLASize(QualType Ty)
   
   return 0;
 }
+
+llvm::Value* CodeGenFunction::EmitVAListRef(const Expr* E) {
+  if (CGM.getContext().getBuiltinVaListType()->isArrayType()) {
+    return EmitScalarExpr(E);
+  }
+  return EmitLValue(E).getAddress();
+}

lib/CodeGen/CodeGenFunction.h

@@ -314,6 +314,11 @@ public:
   RValue EmitAnyExpr(const Expr *E, llvm::Value *AggLoc = 0, 
                      bool isAggLocVolatile = false);
 
+  // EmitVAListRef - Emit a "reference" to a va_list; this is either the
+  // address or the value of the expression, depending on how va_list is
+  // defined.
+  llvm::Value *EmitVAListRef(const Expr *E);
+
   /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result
   /// will always be accessible even if no aggregate location is
   /// provided.