From b1bf55dd63936cecab0320196236e50673f951f1 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Tue, 4 Feb 2014 23:23:44 +0100
Subject: [PATCH] Added select -none

---
 passes/cmds/select.cc | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/passes/cmds/select.cc b/passes/cmds/select.cc
index 9c0a39650..253d8d68f 100644
--- a/passes/cmds/select.cc
+++ b/passes/cmds/select.cc
@@ -709,8 +709,12 @@ struct SelectPass : public Pass {
 		log("        count all objects in the current selection\n");
 		log("\n");
 		log("    -clear\n");
-		log("        clear the current selection. this effectively selects the\n");
-		log("        whole design.\n");
+		log("        clear the current selection. this effectively selects the whole\n");
+		log("        design. it also resets the selected module (see -module). use the\n");
+		log("        command 'select *' to select everything but stay in the current module.\n");
+		log("\n");
+		log("    -none\n");
+		log("        create an empty selection. the current module is unchanged.\n");
 		log("\n");
 		log("    -module <modname>\n");
 		log("        limit the current scope to the specified module.\n");
@@ -825,6 +829,7 @@ struct SelectPass : public Pass {
 		bool add_mode = false;
 		bool del_mode = false;
 		bool clear_mode = false;
+		bool none_mode = false;
 		bool list_mode = false;
 		bool count_mode = false;
 		bool got_module = false;
@@ -859,6 +864,10 @@ struct SelectPass : public Pass {
 				clear_mode = true;
 				continue;
 			}
+			if (arg == "-none") {
+				none_mode = true;
+				continue;
+			}
 			if (arg == "-list") {
 				list_mode = true;
 				continue;
@@ -891,6 +900,9 @@ struct SelectPass : public Pass {
 		if (clear_mode && args.size() != 2)
 			log_cmd_error("Option -clear can not be combined with any other options.\n");
 
+		if (none_mode && args.size() != 2)
+			log_cmd_error("Option -none can not be combined with any other options.\n");
+
 		if (add_mode + del_mode + assert_none + assert_any > 1)
 			log_cmd_error("Options -add, -del, -assert-none or -assert-any can not be combined.\n");
 
@@ -913,13 +925,17 @@ struct SelectPass : public Pass {
 
 		assert(design->selection_stack.size() > 0);
 
-		if (clear_mode)
-		{
+		if (clear_mode) {
 			design->selection_stack.back() = RTLIL::Selection(true);
 			design->selected_active_module = std::string();
 			return;
 		}
 
+		if (none_mode) {
+			design->selection_stack.back() = RTLIL::Selection(false);
+			return;
+		}
+
 		if (list_mode || count_mode || !write_file.empty())
 		{
 		#define LOG_OBJECT(...) do { if (list_mode) log(__VA_ARGS__); if (f != NULL) fprintf(f, __VA_ARGS__); total_count++; } while (0)
-- 
2.30.2