Add regression test for accessing static class properties

Check that static class properties can be accessed for read and write and
that they are shared between all instances of a class type.

Check that this works for the following 3 cases

 * accessing the static property in a class function or task
 * accessing the static property in a class function or task using `this`
 * accessing the static property on a class object instance

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

ivtest/ivltests/sv_class_static_prop1.v

@@ -0,0 +1,30 @@
+// Check that static class properties can be accessed for read and write in
+// class tasks. Check the property is shared across all instances and has the
+// same value for all instances.
+
+class C;
+  static int i;
+  task t;
+    int x;
+    x = i;
+    i = x + 1;
+  endtask
+endclass
+
+module test;
+
+  C c1 = new;
+  C c2 = new;
+  C c3 = new;
+
+  initial begin
+    c1.t();
+    c2.t();
+    if (c1.i == 2 && c2.i == 2 && c3.i == 2) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule

ivtest/ivltests/sv_class_static_prop2.v

@@ -0,0 +1,30 @@
+// Check that static class properties can be accessed for read and write in
+// class tasks using `this`. Check the property is shared across all instances
+// and has the same value for all instances.
+
+class C;
+  static int i;
+  task t;
+    int x;
+    x = this.i;
+    this.i = x + 1;
+  endtask
+endclass
+
+module test;
+
+  C c1 = new;
+  C c2 = new;
+  C c3 = new;
+
+  initial begin
+    c1.t();
+    c2.t();
+    if (c1.i == 2 && c2.i == 2 && c3.i == 2) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule

ivtest/ivltests/sv_class_static_prop3.v

@@ -0,0 +1,31 @@
+// Check that static class properties can be accessed for read and write on a
+// class object. Check the property is shared across all instances and has the
+// same value for all instances.
+
+class C;
+  static int i;
+endclass
+
+module test;
+
+  C c1 = new;
+  C c2 = new;
+  C c3 = new;
+
+  task t(C c);
+    int x;
+    x = c.i;
+    c.i = x + 1;
+  endtask
+
+  initial begin
+    t(c1);
+    t(c2);
+    if (c1.i == 2 && c2.i == 2 && c3.i == 2) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule

ivtest/regress-sv.list

@@ -487,6 +487,9 @@ sv_class_extends_scoped	normal,-g2009		ivltests
 sv_class_localparam	normal,-g2009		ivltests
 sv_class_new_init	normal,-g2009		ivltests
 sv_class_in_module_decl	normal,-g2009		ivltests
+sv_class_static_prop1	normal,-g2009		ivltests
+sv_class_static_prop2	normal,-g2009		ivltests
+sv_class_static_prop3	normal,-g2009		ivltests
 sv_class_super1		normal,-g2009		ivltests
 sv_class_super2		normal,-g2009		ivltests
 sv_class_task1		normal,-g2009		ivltests

ivtest/regress-vlog95.list

@@ -383,6 +383,9 @@ sv_class_extends_scoped	CE,-g2009		ivltests
 sv_class_localparam	CE,-g2009		ivltests
 sv_class_new_init	CE,-g2009		ivltests
 sv_class_in_module_decl	CE,-g2009		ivltests
+sv_class_static_prop1	CE,-g2009		ivltests
+sv_class_static_prop2	CE,-g2009		ivltests
+sv_class_static_prop3	CE,-g2009		ivltests
 sv_class_super1		CE,-g2009		ivltests
 sv_class_super2		CE,-g2009		ivltests
 sv_class_task1		CE,-g2009		ivltests