box_derive: New command to derive modules for boxes

passes/cmds/Makefile.inc

@@ -48,3 +48,4 @@ OBJS += passes/cmds/clean_zerowidth.o
 OBJS += passes/cmds/xprop.o
 OBJS += passes/cmds/dft_tag.o
 OBJS += passes/cmds/future.o
+OBJS += passes/cmds/box_derive.o

passes/cmds/box_derive.cc

@@ -0,0 +1,116 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2024  Martin Povišer <povik@cutebit.org>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+#include "kernel/yosys.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct BoxDerivePass : Pass {
+	BoxDerivePass() : Pass("box_derive", "derive box modules") {}
+	void help() override
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    box_derive [-base <base_module>] [-naming_attr <attr>] [selection]\n");
+		log("\n");
+		log("As part of the assembly of the design hierarchy done by the 'hierarchy' command,\n");
+		log("specializations of parametric modules are derived on demand: for each choice of\n");
+		log("parameter values appearing in the design, a copy of the parametric module is\n");
+		log("derived which is specialized to that choice.\n");
+		log("\n");
+		log("This derivation process ignores blackboxes and whiteboxes (boxes). To supplement,\n");
+		log("this 'box_derive' command can be used to request the derivation of modules based\n");
+		log("on box instances appearing in the design, which is desirable in certain use\n");
+		log("cases. Only the selected cells are considered as the instances that steer the\n");
+		log("derivation process.\n");
+		log("\n");
+		log("    -base <base_module>\n");
+		log("        instead of deriving the module that directly corresponds to each box\n");
+		log("        instance, derive a specialization of <base_module> (this option applies\n");
+		log("        to all selected box cells)\n");
+		log("\n");
+		log("    -naming_attr <attr>\n");
+		log("        once a specialization is derived, use the value of the module attribute\n");
+		log("        <attr> for a name which should be used for the derived module (this\n");
+		log("        replaces the internal Yosys naming scheme in which the names of derived\n");
+		log("        modules start with '$paramod$')\n");
+		log("\n");
+	}
+	void execute(std::vector<std::string> args, RTLIL::Design *d) override
+	{
+		log_header(d, "Executing BOX_DERIVE pass. (derive modules for boxes)\n");
+
+		size_t argidx;
+		IdString naming_attr;
+		IdString base_name;
+		for (argidx = 1; argidx < args.size(); argidx++) {
+			if (args[argidx] == "-naming_attr" && argidx + 1 < args.size())
+				naming_attr = RTLIL::escape_id(args[++argidx]);
+			else if (args[argidx] == "-base" && argidx + 1 < args.size())
+				base_name = RTLIL::escape_id(args[++argidx]);
+			else
+				break;
+		}
+		extra_args(args, argidx, d);
+
+		Module *base_override = nullptr;
+		if (!base_name.empty()) {
+			base_override = d->module(base_name);
+			if (!base_override)
+				log_cmd_error("Base module %s not found.\n", log_id(base_name));
+		}
+
+		dict<std::pair<RTLIL::IdString, dict<RTLIL::IdString, RTLIL::Const>>, Module*> done;
+
+		for (auto module : d->selected_modules()) {
+			for (auto cell : module->selected_cells()) {
+				Module *inst_module = d->module(cell->type);
+				if (!inst_module || !inst_module->get_blackbox_attribute())
+					continue;
+
+				Module *base = inst_module;
+				if (base_override)
+					base = base_override;
+
+				auto index = std::make_pair(base->name, cell->parameters);
+
+				if (cell->parameters.empty() || done.count(index))
+					continue;
+
+				IdString derived_type = base->derive(d, cell->parameters);
+				Module *derived = d->module(derived_type);
+				log_assert(derived && "Failed to derive module\n");
+				log_debug("derived %s\n", derived_type.c_str());
+
+				if (!naming_attr.empty() && derived->has_attribute(naming_attr)) {
+					IdString new_name = RTLIL::escape_id(derived->get_string_attribute(naming_attr));
+					if (!new_name.isPublic())
+						log_error("Derived module %s cannot be renamed to private name %s.\n",
+								  log_id(derived), log_id(new_name));
+					derived->attributes.erase(naming_attr);
+					d->rename(derived, new_name);
+				}
+
+				done[index] = derived;
+			}
+		}
+	}
+} BoxDerivePass;
+
+PRIVATE_NAMESPACE_END

passes/cmds/select.cc

@@ -1065,6 +1065,10 @@ struct SelectPass : public Pass {
 		log("        selection is non-empty. i.e. produce an error if no object or module\n");
 		log("        matching the selection is found.\n");
 		log("\n");
+		log("    -assert-mod-count N\n");
+		log("        do not modify the current selection. instead assert that the given\n");
+		log("        selection contains exactly N modules (partially or fully selected).\n");
+		log("\n");
 		log("    -assert-count N\n");
 		log("        do not modify the current selection. instead assert that the given\n");
 		log("        selection contains exactly N objects.\n");
@@ -1263,6 +1267,7 @@ struct SelectPass : public Pass {
 		bool got_module = false;
 		bool assert_none = false;
 		bool assert_any = false;
+		int assert_modcount = -1;
 		int assert_count = -1;
 		int assert_max = -1;
 		int assert_min = -1;
@@ -1291,6 +1296,10 @@ struct SelectPass : public Pass {
 				assert_any = true;
 				continue;
 			}
+			if (arg == "-assert-mod-count" && argidx+1 < args.size()) {
+				assert_modcount = atoi(args[++argidx].c_str());
+				continue;
+			}
 			if (arg == "-assert-count" && argidx+1 < args.size()) {
 				assert_count = atoi(args[++argidx].c_str());
 				continue;
@@ -1345,7 +1354,8 @@ struct SelectPass : public Pass {
 			}
 			if (arg.size() > 0 && arg[0] == '-')
 				log_cmd_error("Unknown option %s.\n", arg.c_str());
-			bool disable_empty_warning = count_mode || assert_none || assert_any || (assert_count != -1) || (assert_max != -1) || (assert_min != -1);
+			bool disable_empty_warning = count_mode || assert_none || assert_any || (assert_modcount != -1) ||
+											(assert_count != -1) || (assert_max != -1) || (assert_min != -1);
 			select_stmt(design, arg, disable_empty_warning);
 			sel_str += " " + arg;
 		}
@@ -1385,17 +1395,20 @@ struct SelectPass : public Pass {
 		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 + (assert_count >= 0) + (assert_max >= 0) + (assert_min >= 0) > 1)
-			log_cmd_error("Options -add, -del, -assert-none, -assert-any, assert-count, -assert-max or -assert-min can not be combined.\n");
+		int common_flagset_tally = add_mode + del_mode + assert_none + assert_any + (assert_modcount >= 0) + (assert_count >= 0) + (assert_max >= 0) + (assert_min >= 0);
+		const char *common_flagset = "-add, -del, -assert-none, -assert-any, -assert-mod-count, -assert-count, -assert-max, or -assert-min";
 
-		if ((list_mode || !write_file.empty() || count_mode) && (add_mode || del_mode || assert_none || assert_any || assert_count >= 0 || assert_max >= 0 || assert_min >= 0))
-			log_cmd_error("Options -list, -write and -count can not be combined with -add, -del, -assert-none, -assert-any, assert-count, -assert-max, or -assert-min.\n");
+		if (common_flagset_tally > 1)
+			log_cmd_error("Options %s can not be combined.\n", common_flagset);                
 
-		if (!set_name.empty() && (list_mode || !write_file.empty() || count_mode || add_mode || !unset_name.empty() || del_mode || assert_none || assert_any || assert_count >= 0 || assert_max >= 0 || assert_min >= 0))
-			log_cmd_error("Option -set can not be combined with -list, -write, -count, -add, -del, -unset, -assert-none, -assert-any, -assert-count, -assert-max, or -assert-min.\n");
+		if ((list_mode || !write_file.empty() || count_mode) && common_flagset_tally)
+			log_cmd_error("Options -list, -write and -count can not be combined with %s.\n", common_flagset);
 
-		if (!unset_name.empty() && (list_mode || !write_file.empty() || count_mode || add_mode || !set_name.empty() || del_mode || assert_none || assert_any || assert_count >= 0 || assert_max >= 0 || assert_min >= 0))
-			log_cmd_error("Option -unset can not be combined with -list, -write, -count, -add, -del, -set, -assert-none, -assert-any, -assert-count, -assert-max, or -assert-min.\n");
+		if (!set_name.empty() && (list_mode || !write_file.empty() || count_mode || !unset_name.empty() || common_flagset_tally))
+			log_cmd_error("Option -set can not be combined with -list, -write, -count, -unset, %s.\n", common_flagset);
+
+		if (!unset_name.empty() && (list_mode || !write_file.empty() || count_mode || !set_name.empty() || common_flagset_tally))
+			log_cmd_error("Option -unset can not be combined with -list, -write, -count, -set, %s.\n", common_flagset);
 
 		if (work_stack.size() == 0 && got_module) {
 			RTLIL::Selection sel;
@@ -1514,15 +1527,16 @@ struct SelectPass : public Pass {
 			return;
 		}
 
-		if (assert_count >= 0 || assert_max >= 0 || assert_min >= 0)
+		if (assert_modcount >= 0 || assert_count >= 0 || assert_max >= 0 || assert_min >= 0)
 		{
-			int total_count = 0;
+			int module_count = 0, total_count = 0;
 			if (work_stack.size() == 0)
 				log_cmd_error("No selection to check.\n");
 			RTLIL::Selection *sel = &work_stack.back();
 			sel->optimize(design);
 			for (auto mod : design->modules())
 				if (sel->selected_module(mod->name)) {
+					module_count++;
 					for (auto wire : mod->wires())
 						if (sel->selected_member(mod->name, wire->name))
 							total_count++;
@@ -1536,6 +1550,11 @@ struct SelectPass : public Pass {
 						if (sel->selected_member(mod->name, it.first))
 							total_count++;
 				}
+			if (assert_modcount >= 0 && assert_modcount != module_count)
+			{
+				log_error("Assertion failed: selection contains %d modules instead of the asserted %d:%s\n",
+						module_count, assert_modcount, sel_str.c_str());
+			}
 			if (assert_count >= 0 && assert_count != total_count)
 			{
 				std::string desc = describe_selection_for_assert(design, sel);

tests/various/box_derive.ys

@@ -0,0 +1,53 @@
+read_verilog <<EOF
+(* whitebox *)
+(* final_name=$sformatf("aa%d", X) *)
+module aa(input wire d, output wire q);
+  parameter [1:0] X = 0;
+  assign q = X[d];
+endmodule
+
+(* whitebox *)
+(* final_name=$sformatf("bb%d", X) *)
+module bb(input wire d, output wire q);
+  parameter [1:0] X = 0;
+  assign q = X[~d];
+endmodule
+
+(* whitebox *)
+(* final_name=$sformatf("cc%d", X) *)
+module cc(input wire d, output wire q);
+  parameter [1:0] X = 0;
+  assign q = ~X[d];
+endmodule
+
+module top;
+	wire d, q1, q2, q3, q3, q4, q5, q6;
+
+	aa #(.X(1)) aa1(.d(d), .q(q1));
+	aa #(.X(2)) aa2(.d(d), .q(q2));
+
+	bb #(.X(1)) bb1(.d(d), .q(q3));
+	bb #(.X(3)) bb2(.d(d), .q(q4));
+
+	cc #(.X(1)) cc1(.d(d), .q(q5));
+	cc #(.X(1)) cc2(.d(d), .q(q6));
+endmodule
+EOF
+
+box_derive -naming_attr final_name top
+
+select -assert-mod-count 1 =aa1
+select -assert-mod-count 1 =aa2
+select -assert-mod-count 0 =aa3
+
+select -assert-mod-count 1 =bb1
+select -assert-mod-count 0 =bb2
+select -assert-mod-count 1 =bb3
+
+select -assert-mod-count 1 =cc1
+select -assert-mod-count 0 =cc2
+select -assert-mod-count 0 =cc3
+
+# we are expecting the original aa, bb, cc modules
+# and 5 specializations generated by box_derive
+select -assert-mod-count 8 =A:whitebox