rtlil: Add selection helpers

New methods on Design to push/pop selection instead of accessing the selection stack directly. Includes methods for pushing a full/complete/empty selection.
Also helper methods on modules to check `is_selected` and `is_selected_whole`.

kernel/rtlil.cc

@@ -1146,6 +1146,35 @@ bool RTLIL::Design::selected_whole_module(RTLIL::Module *mod) const
 	return selected_whole_module(mod->name);
 }
 
+void RTLIL::Design::push_selection(RTLIL::Selection sel)
+{
+	sel.current_design = this;
+	selection_stack.push_back(sel);
+}
+
+void RTLIL::Design::push_empty_selection()
+{
+	RTLIL::Selection sel(false, false, this);
+	push_selection(sel);
+}
+
+void RTLIL::Design::push_full_selection()
+{
+	RTLIL::Selection sel(true, false, this);
+	push_selection(sel);
+}
+
+void RTLIL::Design::push_complete_selection()
+{
+	RTLIL::Selection sel(true, true, this);
+	sel.optimize(this);
+	push_selection(sel);
+}
+
+void RTLIL::Design::pop_selection()
+{
+	selection_stack.pop_back();
+}
 
 std::vector<RTLIL::Module*> RTLIL::Design::selected_modules(RTLIL::SelectPartials partials, RTLIL::SelectBoxes boxes) const
 {
@@ -2407,6 +2436,16 @@ bool RTLIL::Module::has_processes_warn() const
 	return !processes.empty();
 }
 
+bool RTLIL::Module::is_selected() const
+{
+	return design->selected_module(this->name);
+}
+
+bool RTLIL::Module::is_selected_whole() const
+{
+	return design->selected_whole_module(this->name);
+}
+
 std::vector<RTLIL::Wire*> RTLIL::Module::selected_wires() const
 {
 	std::vector<RTLIL::Wire*> result;

kernel/rtlil.h

@@ -1239,6 +1239,12 @@ struct RTLIL::Design
 	bool selected_module(RTLIL::Module *mod) const;
 	bool selected_whole_module(RTLIL::Module *mod) const;
 
+	void push_selection(RTLIL::Selection sel);
+	void push_empty_selection();
+	void push_full_selection();
+	void push_complete_selection();
+	void pop_selection();
+
 	RTLIL::Selection &selection() {
 		return selection_stack.back();
 	}
@@ -1356,6 +1362,9 @@ public:
 	bool has_memories_warn() const;
 	bool has_processes_warn() const;
 
+	bool is_selected() const;
+	bool is_selected_whole() const;
+
 	std::vector<RTLIL::Wire*> selected_wires() const;
 	std::vector<RTLIL::Cell*> selected_cells() const;
 	std::vector<RTLIL::Memory*> selected_memories() const;