Add regression test for undriven net initialisation (issue #1041).

Author: martinwhitaker

ivtest/vpi/br_gh1041.c

@@ -0,0 +1,52 @@
+#include <vpi_user.h>
+
+static PLI_INT32 start_cb(struct t_cb_data *cb)
+{
+    static struct t_vpi_value val;
+    vpiHandle wire;
+
+    (void)cb;  // suppress unused parameter warning
+
+    wire = vpi_handle_by_name("test.w4", NULL);
+    if (wire) {
+        val.format = vpiIntVal;
+        val.value.integer = 1;
+        vpi_put_value(wire, &val, NULL, vpiNoDelay);
+    } else {
+        vpi_printf("Failed to get handle for w4\n");
+    }
+
+    wire = vpi_handle_by_name("test.w8", NULL);
+    if (wire) {
+        val.format = vpiIntVal;
+        val.value.integer = 1;
+        vpi_put_value(wire, &val, NULL, vpiNoDelay);
+    } else {
+        vpi_printf("Failed to get handle for w8\n");
+    }
+
+    wire = vpi_handle_by_name("test.wr", NULL);
+    if (wire) {
+        val.format = vpiRealVal;
+        val.value.real = 1.0;
+        vpi_put_value(wire, &val, NULL, vpiNoDelay);
+    } else {
+        vpi_printf("Failed to get handle for wr\n");
+    }
+
+    return 0;
+}
+
+static void register_cb(void)
+{
+    struct t_cb_data         cbd = {};
+
+    cbd.reason = cbStartOfSimulation;
+    cbd.cb_rtn = start_cb;
+    vpi_register_cb(&cbd);
+}
+
+void (*vlog_startup_routines[])(void) = {
+    register_cb,
+    0
+};

ivtest/vpi/br_gh1041.v

@@ -0,0 +1,20 @@
+module test;
+  wire w4;
+  tri0 w8;
+  wire real wr;
+
+  reg failed = 0;
+
+  initial begin
+    #0;
+    $display("w4 %b w8 %b wr %f", w4, w8, wr);
+    if (w4 !== 1'b1) failed = 1;
+    if (w8 !== 1'b1) failed = 1;
+    if (wr != 1.0)   failed = 1;
+
+    if (failed)
+      $display("FAILED");
+    else
+      $display("PASSED");
+  end
+endmodule

ivtest/vpi_gold/br_gh1041.gold

@@ -0,0 +1,4 @@
+Compiling vpi/br_gh1041.c...
+Making br_gh1041.vpi from  br_gh1041.o...
+w4 1 w8 1 wr 1.000000
+PASSED

ivtest/vpi_regress.list

@@ -71,6 +71,7 @@ br_gh308		normal			br_gh308.c		br_gh308.gold
 br_gh317		normal			br_gh317.c		br_gh317.gold
 br_gh496		normal,-g2009		br_gh496.c		br_gh496.gold
 br_gh1037		normal,-g2009		br_gh1037.c		br_gh1037.gold
+br_gh1041		normal			br_gh1041.c		br_gh1041.gold
 br_ml20191013		normal			br_ml20191013.c		br_ml20191013.gold
 by_index		normal			by_index.c		by_index.gold
 by_name			normal			by_name.c		by_name.log