Add regression tests for edge controls on named event errors

Check that the compiler reports an error for `posedge`, `negedge` and `edge`
event controls on named events. Edge controls can not be used with named
events.

There is already an existing test that checks both `posedge` and `negedge`.
Split it into separate tests so that each invalid event control is checked
independently.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/ivltests/named_event_edge_fail.v

@@ -0,0 +1,11 @@
+// Check that edge event controls can not be used with named events.
+
+module test;
+
+  event e;
+
+  initial begin
+    @(edge e);
+  end
+
+endmodule

ivtest/ivltests/named_event_negedge_fail.v

@@ -0,0 +1,11 @@
+// Check that negedge event controls can not be used with named events.
+
+module test;
+
+  event e;
+
+  initial begin
+    @(negedge e);
+  end
+
+endmodule

ivtest/ivltests/named_event_no_edges.v

@@ -1,15 +0,0 @@
-module top;
-  event my_event;
-
-  // The following two line should be an error
-  // You can not take the edge of a named event.
-  always @(posedge my_event) $display("Posedge event.");
-  always @(negedge my_event) $display("Negedge event.");
-  // This should work correctly.
-  always @(my_event) $display("Any event edge.");
-
-  initial begin
-    #1 ->my_event;
-    #1 $display("FAILED");
- end
-endmodule

ivtest/ivltests/named_event_posedge_fail.v

@@ -0,0 +1,11 @@
+// Check that posedge event controls can not be used with named events.
+
+module test;
+
+  event e;
+
+  initial begin
+    @(posedge e);
+  end
+
+endmodule

ivtest/regress-vlg.list

@@ -719,7 +719,6 @@ multi_bit_strength	normal			ivltests gold=multi_bit_strength.gold
 multi_driver_delay	normal			ivltests
 multiply_large		normal			ivltests # Takes care of PR222
 muxtest			normal			ivltests # Validates that X sel and inputs same, output not X
-named_event_no_edges	CE			ivltests
 nb_assign		normal			ivltests
 nb_delay		normal			ivltests
 nb_ec_concat		normal			ivltests

ivtest/regress-vvp.list

@@ -156,6 +156,9 @@ module_port_array1		vvp_tests/module_port_array1.json
 module_port_array_fail1		vvp_tests/module_port_array_fail1.json
 module_port_array_init1		vvp_tests/module_port_array_init1.json
 monitor4			vvp_tests/monitor4.json
+named_event_edge_fail		vvp_tests/named_event_edge_fail.json
+named_event_negedge_fail	vvp_tests/named_event_negedge_fail.json
+named_event_posedge_fail	vvp_tests/named_event_posedge_fail.json
 non-polymorphic-abs		vvp_tests/non-polymorphic-abs.json
 partsel_invalid_idx1		vvp_tests/partsel_invalid_idx1.json
 partsel_invalid_idx2		vvp_tests/partsel_invalid_idx2.json

ivtest/vvp_tests/named_event_edge_fail.json

@@ -0,0 +1,5 @@
+{
+    "type"          : "CE",
+    "source"        : "named_event_edge_fail.v",
+    "iverilog-args" : [ "-g2005-sv" ]
+}

ivtest/vvp_tests/named_event_negedge_fail.json

@@ -0,0 +1,4 @@
+{
+    "type"   : "CE",
+    "source" : "named_event_negedge_fail.v"
+}

ivtest/vvp_tests/named_event_posedge_fail.json

@@ -0,0 +1,4 @@
+{
+    "type"   : "CE",
+    "source" : "named_event_posedge_fail.v"
+}