cg: Fix triggering of an mlir assertion.

trailofbits · Oct 26, 2023 · 5e92b25 · 5e92b25
1 parent c2bcae6
commit 5e92b25
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/lib/vast/CodeGen/CodeGenFunction.cpp b/lib/vast/CodeGen/CodeGenFunction.cpp
@@ -118,7 +118,10 @@ namespace vast::cg
     operation get_last_effective_operation(auto &block) {
         auto last = &block.back();
         if (auto scope = mlir::dyn_cast< core::ScopeOp >(last)) {
-            return get_last_effective_operation(scope.getBody().back());
+            auto &last_block = scope.getBody().back();
+            // Getting last op of empty block triggers MLIR assert
+            if (!last_block.empty())
+                return get_last_effective_operation(last_block);
         }
 
         return last;