PR3248: Make sure the evaluate the operand of a sizeof when it has a VLA type.

Adapted from patch by Tim Northover.

llvm-svn: 69566

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 98c41e24b6a..0c6e6c6854c 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -725,6 +725,10 @@ ScalarExprEmitter::VisitSizeOfAlignOfExpr(const SizeOfAlignOfExpr *E) {
       if (E->isArgumentType()) {
         // sizeof(type) - make sure to emit the VLA size.
         CGF.EmitVLASize(TypeToSize);
+      } else {
+        // C99 6.5.3.4p2: If the argument is an expression of type
+        // VLA, it is evaluated.
+        CGF.EmitAnyExpr(E->getArgumentExpr());
       }
       
       return CGF.GetVLASize(VAT);