Added select -none

diff --git a/passes/cmds/select.cc b/passes/cmds/select.cc
index 9c0a39650c6d2cd58c20af29223f74a572e52e39..253d8d68fb8294346a8b19994fc1f8703417b2b6 100644 (file)
--- 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)