Add a regression test for functions with queue return type

Check that a queue type is supported for the return type of a function.
Make sure that the queue is not cleared in between invocations for
non-automatic functions.

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

ivtest/ivltests/sv_queue_function.v

@@ -0,0 +1,41 @@
+// Check that a queue return type is supported for functions
+
+module test;
+
+  typedef int Q[$];
+
+  // Since this is not an automatic function calling this repeatetly will
+  // append to the same queue.
+  function Q f1(int x);
+    f1.push_back(1 + x);
+    f1.push_back(2 + x);
+  endfunction
+
+  // Since this function is automatic a new queue will be created each time it
+  // is called.
+  function automatic Q f2(int x);
+    f2.push_back(1 + x);
+    f2.push_back(2 + x);
+  endfunction
+
+  initial begin
+    Q a, b, c, d;
+
+    a = f1(0);
+    // `a` should be a copy and not affected by the second call
+    b = f1(2);
+
+    c = f2(0);
+    d = f2(2);
+
+    if (a.size() == 2 && a[0] == 1 && a[1] == 2 &&
+        b.size() == 4 && b[0] == 1 && b[1] == 2 && b[2] == 3 && b[3] == 4 &&
+        c.size() == 2 && c[0] == 1 && c[1] == 2 &&
+        d.size() == 2 && d[0] == 3 && d[1] == 4) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule

ivtest/regress-sv.list

@@ -575,6 +575,7 @@ sv_port_default14	CE,-g2009		ivltests
 sv_queue1		normal,-g2009		ivltests
 sv_queue2		normal,-g2009		ivltests
 sv_queue3		normal,-g2009		ivltests
+sv_queue_function	normal,-g2009		ivltests
 sv_queue_parray		normal,-g2009,-pfileline=1	ivltests gold=sv_queue_parray.gold
 sv_queue_parray_bounded	normal,-g2009,-pfileline=1	ivltests gold=sv_queue_parray_bounded.gold
 sv_queue_parray_fail	CE,-g2009		ivltests gold=sv_queue_parray_fail.gold

ivtest/regress-vlog95.list

@@ -463,6 +463,7 @@ pr3390385b		CE,-g2009		ivltests  # ++
 pr3390385c		CE,-g2009		ivltests  # ++
 pr3390385d		CE,-g2009		ivltests  # ++
 pr3462145		CE,-g2009		ivltests  # ++
+sv_queue_function	CE,-g2009,-pallowsigned=1	ivltests  # queue
 sv_typedef_darray_base1	CE,-g2009		ivltests  # Dyanmic array
 sv_typedef_darray_base2	CE,-g2009		ivltests  # Dyanmic array
 sv_typedef_darray_base3	CE,-g2009		ivltests  # Dyanmic array