Implement the sizeof...(pack) expression to compute the length of a
parameter pack.
Note that we're missing proper libclang support for the new
SizeOfPackExpr expression node.
llvm-svn: 122813
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index c39b398..23a4b09 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -291,6 +291,8 @@
if (Visit(E->getInit(i))) return true;
return false;
}
+
+ bool VisitSizeOfPackExpr(SizeOfPackExpr *) { return false; }
};
} // end anonymous namespace
@@ -965,7 +967,8 @@
bool VisitUnaryImag(const UnaryOperator *E);
bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E);
-
+ bool VisitSizeOfPackExpr(const SizeOfPackExpr *E);
+
private:
CharUnits GetAlignOfExpr(const Expr *E);
CharUnits GetAlignOfType(QualType T);
@@ -1761,6 +1764,10 @@
return Success(0, E);
}
+bool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) {
+ return Success(E->getPackLength(), E);
+}
+
bool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
return Success(E->getValue(), E);
}
@@ -2637,6 +2644,7 @@
case Expr::PackExpansionExprClass:
return ICEDiag(2, E->getLocStart());
+ case Expr::SizeOfPackExprClass:
case Expr::GNUNullExprClass:
// GCC considers the GNU __null value to be an integral constant expression.
return NoDiag();