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-rw-r--r--backends/aiger/xaiger.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index 9e0a56963..830c86787 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -710,6 +710,10 @@ struct XAigerWriter
RTLIL::Module *holes_module = module->design->module(stringf("%s$holes", module->name.c_str()));
log_assert(holes_module);
+ for (auto cell : holes_module->cells())
+ if (!cell->type.in("$_NOT_", "$_AND_"))
+ log_error("Whitebox contents cannot be represented as AIG. Please verify whiteboxes are synthesisable.\n");
+
module->design->selection_stack.emplace_back(false);
module->design->selection().select(holes_module);