From: Daniel Dunbar <daniel@zuster.org>
Date: Wed, 11 Feb 2009 20:59:32 +0000 (+0000)
Subject: Support IRgen of va_arg of structure as l-value.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5b5c9ef865607e179413462dcd71bcebb5b7daae;p=clang

Support IRgen of va_arg of structure as l-value.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64325 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index f7bbb606a7..4d6c3f1c28 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -137,6 +137,8 @@ LValue CodeGenFunction::EmitLValue(const Expr *E) {
   case Expr::CallExprClass: 
   case Expr::CXXOperatorCallExprClass:
     return EmitCallExprLValue(cast<CallExpr>(E));
+  case Expr::VAArgExprClass:
+    return EmitVAArgExprLValue(cast<VAArgExpr>(E));
   case Expr::DeclRefExprClass: 
   case Expr::QualifiedDeclRefExprClass:
     return EmitDeclRefLValue(cast<DeclRefExpr>(E));
@@ -996,11 +998,17 @@ LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
 LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
   // Can only get l-value for call expression returning aggregate type
   RValue RV = EmitCallExpr(E);
-  // FIXME: can this be volatile?
   return LValue::MakeAddr(RV.getAggregateAddr(),
                           E->getType().getCVRQualifiers());
 }
 
+LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
+  // FIXME: This shouldn't require another copy.
+  llvm::Value *Temp = CreateTempAlloca(ConvertType(E->getType()));
+  EmitAggExpr(E, Temp, false);
+  return LValue::MakeAddr(Temp, E->getType().getCVRQualifiers());
+}
+
 LValue
 CodeGenFunction::EmitCXXConditionDeclLValue(const CXXConditionDeclExpr *E) {
   EmitLocalBlockVarDecl(*E->getVarDecl());
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index fcd0ebaa0a..39f1c1d6ca 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -555,8 +555,10 @@ public:
 
   // Note: only availabe for agg return types
   LValue EmitBinaryOperatorLValue(const BinaryOperator *E);
-  // Note: only availabe for agg return types
+  // Note: only available for agg return types
   LValue EmitCallExprLValue(const CallExpr *E);
+  // Note: only available for agg return types
+  LValue EmitVAArgExprLValue(const VAArgExpr *E);
   LValue EmitDeclRefLValue(const DeclRefExpr *E);
   LValue EmitStringLiteralLValue(const StringLiteral *E);
   LValue EmitPredefinedFunctionName(unsigned Type);