teach codegen to handle noop casts as lvalues.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67164 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 3ab8568..b3cf921 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -179,6 +179,19 @@
return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
case Expr::ChooseExprClass:
return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr(getContext()));
+ case Expr::ImplicitCastExprClass:
+ case Expr::CStyleCastExprClass:
+ case Expr::CXXFunctionalCastExprClass:
+ case Expr::CXXStaticCastExprClass:
+ case Expr::CXXDynamicCastExprClass:
+ case Expr::CXXReinterpretCastExprClass:
+ case Expr::CXXConstCastExprClass:
+ // Casts are only lvalues when the source and destination types are the
+ // same.
+ assert(getContext().hasSameUnqualifiedType(E->getType(),
+ cast<CastExpr>(E)->getSubExpr()->getType()) &&
+ "Type changing cast is not an lvalue");
+ return EmitLValue(cast<CastExpr>(E)->getSubExpr());
}
}
diff --git a/test/CodeGen/exprs.c b/test/CodeGen/exprs.c
index 8174267..db60b5a 100644
--- a/test/CodeGen/exprs.c
+++ b/test/CodeGen/exprs.c
@@ -58,4 +58,12 @@
int x = fp - fp2;
}
+// noop casts as lvalues.
+struct X {
+ int Y;
+};
+struct X foo();
+int bar() {
+ return ((struct X)foo()).Y + 1;
+}