Support for 'modports' for System Verilog interfaces

frontends/ast/ast.cc

@@ -1118,7 +1118,7 @@ void AstModule::reprocess_module(RTLIL::Design *design, dict<RTLIL::IdString, RT
 }
 
 // create a new parametric module (when needed) and return the name of the generated module - WITH support for interfaces
-RTLIL::IdString AstModule::derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, dict<RTLIL::IdString, RTLIL::Module*> interfaces, bool mayfail)
+RTLIL::IdString AstModule::derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, dict<RTLIL::IdString, RTLIL::Module*> interfaces, dict<RTLIL::IdString, RTLIL::IdString> modports, bool mayfail)
 {
 	AstNode *new_ast = NULL;
 	std::string modname = derive_common(design, parameters, &new_ast, mayfail);
@@ -1143,14 +1143,46 @@ RTLIL::IdString AstModule::derive(RTLIL::Design *design, dict<RTLIL::IdString, R
 		for(auto &intf : interfaces) {
 			RTLIL::Module * intfmodule = intf.second;
 			std::string intfname = intf.first.str();
+			AstNode *modport = NULL;
+			if (modports.count(intfname) > 0) {
+				std::string interface_modport = modports.at(intfname).str();
+				AstModule *ast_module_of_interface = (AstModule*)intfmodule;
+				AstNode *ast_node_of_interface = ast_module_of_interface->ast;
+				for (auto &ch : ast_node_of_interface->children) {
+					if (ch->type == AST_MODPORT) {
+						if (ch->str == interface_modport) {
+							modport = ch;
+						}
+					}
+				}
+			}
 			for (auto &wire_it : intfmodule->wires_){
 				AstNode *wire = new AstNode(AST_WIRE, new AstNode(AST_RANGE, AstNode::mkconst_int(wire_it.second->width -1, true), AstNode::mkconst_int(0, true)));
 				std::string origname = log_id(wire_it.first);
 				std::string newname = intfname + "." + origname;
 				wire->str = newname;
-				wire->is_input = true;
+				if (modport != NULL) {
-				wire->is_output = true;
+					bool found_in_modport = false;
-				new_ast->children.push_back(wire);
+					for (auto &ch : modport->children) {
+						if (ch->type == AST_MODPORTMEMBER) {
+							std::string compare_name = "\\" + origname;
+							if (ch->str == compare_name) {
+								found_in_modport = true;
+								wire->is_input = ch->is_input;
+								wire->is_output = ch->is_output;
+								break;
+							}
+						}
+					}
+					if (found_in_modport) { // If not found in modport, do not create port
+						new_ast->children.push_back(wire);
+					}
+				}
+				else { // If no modport, set inout
+					wire->is_input = true;
+					wire->is_output = true;
+					new_ast->children.push_back(wire);
+				}
 			}
 		}
 

frontends/ast/ast.h

@@ -145,6 +145,8 @@ namespace AST
 		AST_INTERFACE,
 		AST_INTERFACEPORT,
 		AST_INTERFACEPORTTYPE,
+		AST_MODPORT,
+		AST_MODPORTMEMBER,
 		AST_PACKAGE
 	};
 
@@ -287,7 +289,7 @@ namespace AST
 		bool nolatches, nomeminit, nomem2reg, mem2reg, lib, noopt, icells, autowire;
 		~AstModule() YS_OVERRIDE;
 		RTLIL::IdString derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, bool mayfail) YS_OVERRIDE;
-		RTLIL::IdString derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, dict<RTLIL::IdString, RTLIL::Module*> interfaces, bool mayfail) YS_OVERRIDE;
+		RTLIL::IdString derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, dict<RTLIL::IdString, RTLIL::Module*> interfaces, dict<RTLIL::IdString, RTLIL::IdString> modports, bool mayfail) YS_OVERRIDE;
 		std::string derive_common(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, AstNode **new_ast_out, bool mayfail);
 		void reprocess_module(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Module *> local_interfaces) YS_OVERRIDE;
 		RTLIL::Module *clone() const YS_OVERRIDE;

frontends/ast/genrtlil.cc

@@ -853,6 +853,8 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
 	case AST_GENIF:
 	case AST_GENCASE:
 	case AST_PACKAGE:
+	case AST_MODPORT:
+	case AST_MODPORTMEMBER:
 		break;
 	case AST_INTERFACEPORT: {
 		// If a port in a module with unknown type is found, mark it as "is_interface=true"
@@ -865,6 +867,33 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
 		wire->port_input = true;
 		wire->port_output = true;
 		wire->set_bool_attribute("\\is_interface");
+		if (children.size() > 0) {
+			for(size_t i=0; i<children.size();i++) {
+				if(children[i]->type == AST_INTERFACEPORTTYPE) {
+					std::string name_type = children[i]->str;
+					size_t ndots = std::count(name_type.begin(), name_type.end(), '.');
+					if (ndots == 0) {
+						wire->attributes["\\interface_type"] = name_type;
+					}
+					else {
+						std::stringstream name_type_stream(name_type);
+						std::string segment;
+						std::vector<std::string> seglist;
+						while(std::getline(name_type_stream, segment, '.')) {
+							seglist.push_back(segment);
+						}
+						if (ndots == 1) {
+							wire->attributes["\\interface_type"] = seglist[0];
+							wire->attributes["\\interface_modport"] = seglist[1];
+						}
+						else {
+							log_error("More than two '.' in signal port type (%s)\n", name_type.c_str());
+						}
+					}
+					break;
+				}
+			}
+		}
 		wire->upto = 0;
 		}
 		break;

frontends/verilog/verilog_parser.y

@@ -61,6 +61,7 @@ namespace VERILOG_FRONTEND {
 	bool noassert_mode, noassume_mode, norestrict_mode;
 	bool assume_asserts_mode, assert_assumes_mode;
 	bool current_wire_rand, current_wire_const;
+	bool current_modport_input, current_modport_output;
 	std::istream *lexin;
 }
 YOSYS_NAMESPACE_END
@@ -1325,7 +1326,16 @@ opt_stmt_label:
 	TOK_ID ':' | /* empty */;
 
 modport_stmt:
-    TOK_MODPORT TOK_ID modport_args_opt ';'
+    TOK_MODPORT TOK_ID {
+        AstNode *modport = new AstNode(AST_MODPORT);
+        ast_stack.back()->children.push_back(modport);
+        ast_stack.push_back(modport);
+        modport->str = *$2;
+        delete $2;
+    }  modport_args_opt {
+        ast_stack.pop_back();
+        log_assert(ast_stack.size() == 2);
+    } ';'
 
 modport_args_opt:
     '(' ')' | '(' modport_args optional_comma ')';
@@ -1334,11 +1344,19 @@ modport_args:
     modport_arg | modport_args ',' modport_arg;
 
 modport_arg:
-    modport_type_token TOK_ID |
+    modport_type_token TOK_ID {
+        AstNode *modport_member = new AstNode(AST_MODPORTMEMBER);
+        ast_stack.back()->children.push_back(modport_member);
+        modport_member->str = *$2;
+        modport_member->is_input = current_modport_input;
+        modport_member->is_output = current_modport_output;
+        delete $2;
+    } |
     TOK_ID
+    /* FIXME for TOK_ID without modport_type_token */
 
 modport_type_token:
-    TOK_INPUT | TOK_OUTPUT
+    TOK_INPUT {current_modport_input = 1; current_modport_output = 0;} | TOK_OUTPUT {current_modport_input = 0; current_modport_output = 1;}
 
 assert:
 	opt_stmt_label TOK_ASSERT opt_property '(' expr ')' ';' {

kernel/rtlil.cc

@@ -654,7 +654,7 @@ RTLIL::IdString RTLIL::Module::derive(RTLIL::Design*, dict<RTLIL::IdString, RTLI
 }
 
 
-RTLIL::IdString RTLIL::Module::derive(RTLIL::Design*, dict<RTLIL::IdString, RTLIL::Const>, dict<RTLIL::IdString, RTLIL::Module*> , bool mayfail)
+RTLIL::IdString RTLIL::Module::derive(RTLIL::Design*, dict<RTLIL::IdString, RTLIL::Const>, dict<RTLIL::IdString, RTLIL::Module*>, dict<RTLIL::IdString, RTLIL::IdString>, bool mayfail)
 {
 	if (mayfail)
 		return RTLIL::IdString();

kernel/rtlil.h

@@ -907,7 +907,7 @@ public:
 	Module();
 	virtual ~Module();
 	virtual RTLIL::IdString derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, bool mayfail = false);
-	virtual RTLIL::IdString derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, dict<RTLIL::IdString, RTLIL::Module*> interfaces, bool mayfail = false);
+	virtual RTLIL::IdString derive(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Const> parameters, dict<RTLIL::IdString, RTLIL::Module*> interfaces, dict<RTLIL::IdString, RTLIL::IdString> modports, bool mayfail = false);
 	virtual size_t count_id(RTLIL::IdString id);
 	virtual void reprocess_module(RTLIL::Design *design, dict<RTLIL::IdString, RTLIL::Module *> local_interfaces);
 

passes/hierarchy/hierarchy.cc

@@ -174,6 +174,7 @@ bool expand_module(RTLIL::Design *design, RTLIL::Module *module, bool flag_check
 			cell->type = cell->type.str().substr(pos_type + 1);
 		}
 		dict<RTLIL::IdString, RTLIL::Module*> interfaces_to_add_to_submodule;
+		dict<RTLIL::IdString, RTLIL::IdString> modports_used_in_submodule;
 
 		if (design->modules_.count(cell->type) == 0)
 		{
@@ -224,6 +225,14 @@ bool expand_module(RTLIL::Design *design, RTLIL::Module *module, bool flag_check
 		// some lists, so that they can be replaced further down:
 		for (auto &conn : cell->connections()) {
 			if(mod->wires_.count(conn.first) != 0 && mod->wire(conn.first)->get_bool_attribute("\\is_interface")) { // Check if the connection is present as an interface in the sub-module's port list
+				//const pool<string> &interface_type_pool = mod->wire(conn.first)->get_strpool_attribute("\\interface_type");
+				//for (auto &d : interface_type_pool) { // TODO: Compare interface type to type in parent module
+				//}
+				const pool<string> &interface_modport_pool = mod->wire(conn.first)->get_strpool_attribute("\\interface_modport");
+				std::string interface_modport = "";
+				for (auto &d : interface_modport_pool) {
+					interface_modport = "\\" + d;
+				}
 				if(conn.second.bits().size() == 1 && conn.second.bits()[0].wire->get_bool_attribute("\\is_interface")) {
 					std::string interface_name_str = conn.second.bits()[0].wire->name.str();
 					interface_name_str.replace(0,23,"");
@@ -247,6 +256,9 @@ bool expand_module(RTLIL::Design *design, RTLIL::Module *module, bool flag_check
 						}
 						connections_to_remove.push_back(conn.first);
 						interfaces_to_add_to_submodule[conn.first] = interfaces_in_module.at(interface_name);
+						if (interface_modport != "") {
+							modports_used_in_submodule[conn.first] = interface_modport;
+						}
 					  }
 					  else will_do_step = true;
 					}
@@ -322,7 +334,7 @@ bool expand_module(RTLIL::Design *design, RTLIL::Module *module, bool flag_check
 			continue;
 		}
 
-		cell->type = mod->derive(design, cell->parameters, interfaces_to_add_to_submodule);
+		cell->type = mod->derive(design, cell->parameters, interfaces_to_add_to_submodule, modports_used_in_submodule);
 		cell->parameters.clear();
 		did_something = true;
 

tests/simple/svinterface1.sv

@@ -19,7 +19,7 @@ module TopModule(
 
 
   assign MyInterfaceInstance.setting = 1;
-  assign MyInterfaceInstance.other_setting[2:0] = 3'b101;
+//  assign MyInterfaceInstance.other_setting[2:0] = 3'b101;
 
 endmodule
 
@@ -32,13 +32,25 @@ interface MyInterface #(
 
   logic [1:0] mysig_out;
 
+    modport submodule1 (
+        input  setting,
+        output other_setting,
+        output mysig_out
+    );
+
+    modport submodule2 (
+        input  setting,
+        output other_setting,
+        input  mysig_out
+    );
+
 endinterface
 
 
 module SubModule1(
     input logic clk,
     input logic rst,
-    MyInterface u_MyInterface,
+    MyInterface.submodule1 u_MyInterface,
     input logic [1:0] sig
 
   );
@@ -68,9 +80,11 @@ module SubModule2(
 
     input logic clk,
     input logic rst,
-    MyInterface u_MyInterfaceInSub2,
+    MyInterface.submodule2 u_MyInterfaceInSub2,
     input logic [1:0] sig
 
   );
 
+   assign u_MyInterfaceInSub2.other_setting[2:0] = 9;
+
 endmodule