From 28093d9dd288484daa9df17585c1c9f174498359 Mon Sep 17 00:00:00 2001 From: Clifford Wolf Date: Sun, 24 Nov 2013 05:03:43 +0100 Subject: Added "top" attribute to mark top module in hierarchy --- passes/hierarchy/hierarchy.cc | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'passes/hierarchy') diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc index b98afcc1..d9b52c6d 100644 --- a/passes/hierarchy/hierarchy.cc +++ b/passes/hierarchy/hierarchy.cc @@ -280,6 +280,10 @@ struct HierarchyPass : public Pass { log(" use the specified top module to built a design hierarchy. modules\n"); log(" outside this tree (unused modules) are removed.\n"); log("\n"); + log(" when the -top option is used, the 'top' attribute will be set on the\n"); + log(" specified top module. otherwise a module with the 'top' attribute set\n"); + log(" will implicitly be used as top module, if such a module exists.\n"); + log("\n"); log("In -generate mode this pass generates blackbox modules for the given cell\n"); log("types (wildcards supported). For this the design is searched for cells that\n"); log("match the given types and then the given port declarations are used to\n"); @@ -381,6 +385,11 @@ struct HierarchyPass : public Pass { log_push(); + if (top_mod == NULL) + for (auto &mod_it : design->modules) + if (mod_it.second->get_bool_attribute("\\top")) + top_mod = mod_it.second; + if (top_mod != NULL) hierarchy(design, top_mod); @@ -407,6 +416,14 @@ struct HierarchyPass : public Pass { hierarchy(design, top_mod); } + if (top_mod != NULL) { + for (auto &mod_it : design->modules) + if (mod_it.second == top_mod) + mod_it.second->attributes["\\top"] = RTLIL::Const(1); + else + mod_it.second->attributes.erase("\\top"); + } + if (!keep_positionals) { std::set pos_mods; -- cgit v1.2.3