SystemVerilog support for implicit named port connections

This is the `foo foo(.port1, .port2);` SystemVerilog syntax
introduced in IEEE1800-2005.

frontends/verilog/verilog_parser.y

@@ -154,7 +154,7 @@ struct specify_rise_fall {
 %token TOK_INCREMENT TOK_DECREMENT TOK_UNIQUE TOK_PRIORITY
 
 %type <ast> range range_or_multirange  non_opt_range non_opt_multirange range_or_signed_int
-%type <ast> wire_type expr basic_expr concat_list rvalue lvalue lvalue_concat_list
+%type <ast> wire_type expr basic_expr concat_list rvalue lvalue lvalue_concat_list named_port
 %type <string> opt_label opt_sva_label tok_prim_wrapper hierarchical_id
 %type <boolean> opt_signed opt_property unique_case_attr
 %type <al> attr case_attr
@@ -1541,18 +1541,26 @@ cell_port:
 		astbuf2->children.push_back(node);
 		node->children.push_back($1);
 	} |
-	'.' TOK_ID '(' expr ')' {
-		AstNode *node = new AstNode(AST_ARGUMENT);
-		node->str = *$2;
-		astbuf2->children.push_back(node);
-		node->children.push_back($4);
-		delete $2;
+	named_port '(' ')' | // not connected
+	named_port '(' expr ')' {
+		($1)->children.push_back($3);
 	} |
-	'.' TOK_ID '(' ')' {
+	named_port {
+		// SV implied port
+		if (!sv_mode)
+			frontend_verilog_yyerror("Implicit .name port connection in port list (%s). This is not supported unless read_verilog is called with -sv!", $1->str.c_str());
+		auto id_node = new AstNode(AST_IDENTIFIER);
+		id_node->str = ($1)->str;
+		($1)->children.push_back(id_node);
+	};
+
+named_port:
+	'.' TOK_ID {
 		AstNode *node = new AstNode(AST_ARGUMENT);
 		node->str = *$2;
-		astbuf2->children.push_back(node);
 		delete $2;
+		astbuf2->children.push_back(node);
+		$$ = node;
 	};
 
 always_stmt:

tests/simple/run-test.sh

@@ -17,4 +17,5 @@ if ! which iverilog > /dev/null ; then
   exit 1
 fi
 
-exec ${MAKE:-make} -f ../tools/autotest.mk $seed *.v
+shopt -s nullglob
+exec ${MAKE:-make} -f ../tools/autotest.mk $seed *.{sv,v}

tests/tools/autotest.sh

@@ -89,6 +89,13 @@ done
 
 compile_and_run() {
 	exe="$1"; output="$2"; shift 2
+	ext=${1##*.}
+	if [ "$ext" == "sv" ]; then
+		language_gen="-g2012"
+	else
+		language_gen="-g2005"
+	fi
+
 	if $use_modelsim; then
 		altver=$( ls -v /opt/altera/ | grep '^[0-9]' | tail -n1; )
 		/opt/altera/$altver/modelsim_ase/bin/vlib work
@@ -99,7 +106,7 @@ compile_and_run() {
 		/opt/Xilinx/Vivado/$xilver/bin/xvlog $xinclude_opts -d outfile=\"$output\" "$@"
 		/opt/Xilinx/Vivado/$xilver/bin/xelab -R work.testbench
 	else
-		iverilog $include_opts -Doutfile=\"$output\" -s testbench -o "$exe" "$@"
+		iverilog $language_gen $include_opts -Doutfile=\"$output\" -s testbench -o "$exe" "$@"
 		vvp -n "$exe"
 	fi
 }
@@ -110,7 +117,7 @@ for fn
 do
 	bn=${fn%.*}
 	ext=${fn##*.}
-	if [[ "$ext" != "v" ]] && [[ "$ext" != "aag" ]] && [[ "$ext" != "aig" ]]; then
+	if [[ "$ext" != "v" ]] && [[ "$ext" != "sv" ]] && [[ "$ext" != "aag" ]] && [[ "$ext" != "aig" ]]; then
 		echo "Invalid argument: $fn" >&2
 		exit 1
 	fi
@@ -123,6 +130,10 @@ do
 		echo -n "Test: $bn "
 	fi
 
+	if [ "$ext" == sv ]; then
+		frontend="$frontend -sv"
+	fi
+
 	rm -f ${bn}.{err,log,skip}
 	mkdir -p ${bn}.out
 	rm -rf ${bn}.out/*

tests/various/implicit_ports.sv

@@ -0,0 +1,19 @@
+// Test implicit port connections
+module alu (input [2:0] a, input [2:0] b, input cin, output cout, output [2:0] result);
+	assign cout = cin;
+	assign result = a + b;
+endmodule
+
+module named_ports(output [2:0] alu_result, output cout);
+	wire [2:0] a = 3'b010, b = 3'b100;
+	wire cin = 1;
+
+	alu alu (
+		.a(a),
+		.b, // Implicit connection is equivalent to .b(b)
+		.cin(), // Explicitely unconnected
+		.cout(cout),
+		.result(alu_result)
+	);
+endmodule
+

tests/various/implicit_ports.ys

@@ -0,0 +1,8 @@
+read_verilog -sv implicit_ports.sv
+proc; opt
+
+flatten
+select -module named_ports
+
+sat -verify -prove alu_result 6
+sat -verify -set-all-undef cout