From dac5adde12c585f5e0552f776ae0a5ab05e995c9 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Thu, 16 Apr 2020 12:46:07 -0700
Subject: design: -import to not count black/white-boxes as candidates for top

---
 passes/cmds/design.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'passes')

diff --git a/passes/cmds/design.cc b/passes/cmds/design.cc
index cfe97067d..421defe0c 100644
--- a/passes/cmds/design.cc
+++ b/passes/cmds/design.cc
@@ -228,14 +228,20 @@ struct DesignPass : public Pass {
 			}
 
 			if (import_mode) {
+				std::vector<RTLIL::Module*> candidates;
 				for (auto module : copy_src_modules)
 				{
 					if (module->get_bool_attribute(ID::top)) {
-						copy_src_modules.clear();
-						copy_src_modules.push_back(module);
+						candidates.clear();
+						candidates.push_back(module);
 						break;
 					}
+					if (!module->get_blackbox_attribute())
+						candidates.push_back(module);
 				}
+
+				if (GetSize(candidates) == 1)
+					copy_src_modules = std::move(candidates);
 			}
 		}
 
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