ivtest: Add the dumpfile.v test

Add a regression test to show that the proper dumpfile is selected, by
noting in the output from the vvp command what file name it is creating.

To make this work, I also needed to add some capabilities to the vvp_reg.py
regression test rig.

Documentation/developer/regression_tests.rst

@@ -77,3 +77,17 @@ iverilog-args (optional)
 
 If this is specified, it is a list of strings that are passed as arguments to
 the iverilog command line.
+
+vvp-args (optional)
+^^^^^^^^^^^^^^^^^^^^
+
+If this is specified, it is a list of strings that are passed as arguments to
+the vvp command. These arguments go before the vvp input file that is to be
+run.
+
+vvp-args-extended (optional)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If this is specified, it is a lost of strings that are passed as arguments to
+the vvp command. These are extended arguments, and are placed after the vvp
+input file that is being run. This is where you place things like plusargs.

ivtest/gold/dumpfile-vvp-stdout.gold

@@ -0,0 +1,2 @@
+VCD info: dumpfile foo.vcd opened for output.
+ivltests/dumpfile.v:11: $finish called at 30 (1s)

ivtest/ivltests/dumpfile.v

@@ -0,0 +1,15 @@
+// Github Issue #202
+
+module main;
+   reg clk = 0;
+
+   initial begin
+      //$dumpfile("foo"); // We really want to test the command line flag
+      $dumpvars(0, main);
+      #10 clk <= 1;
+      #10 clk <= 0;
+      #10 $finish;
+      
+   end
+
+endmodule // main

ivtest/regress-vvp.list

@@ -20,6 +20,7 @@ dffsynth8			vvp_tests/dffsynth8.json
 dffsynth9			vvp_tests/dffsynth9.json
 dffsynth10			vvp_tests/dffsynth10.json
 dffsynth11			vvp_tests/dffsynth11.json
+dumpfile			vvp_tests/dumpfile.json
 macro_str_esc			vvp_tests/macro_str_esc.json
 memsynth1			vvp_tests/memsynth1.json
 struct_packed_write_read	vvp_tests/struct_packed_write_read.json

ivtest/run_ivl.py

@@ -18,7 +18,10 @@ def assemble_iverilog_cmd(source: str, it_dir: str, args: list) -> list:
 
 
 def assemble_vvp_cmd(args: list = [], plusargs: list = []) -> list:
-    res = ["vvp", os.path.join("work", "a.out")]
+    res = ["vvp"]
+    res = res + args
+    res.append(os.path.join("work", "a.out"))
+    res = res + plusargs
     return res
 
 
@@ -130,6 +133,8 @@ def do_run_normal(options : dict, expected_fail : bool) -> list:
     it_key = options['key']
     it_dir = options['directory']
     it_iverilog_args = options['iverilog_args']
+    it_vvp_args = options['vvp_args']
+    it_vvp_args_extended = options['vvp_args_extended']
     it_gold = options['gold']
     it_diff = options['diff']
 
@@ -144,7 +149,7 @@ def do_run_normal(options : dict, expected_fail : bool) -> list:
         return [1, "Failed - Compile failed"]
 
     # run the vvp command
-    vvp_cmd = assemble_vvp_cmd()
+    vvp_cmd = assemble_vvp_cmd(it_vvp_args, it_vvp_args_extended)
     vvp_res = subprocess.run(vvp_cmd, capture_output=True)
     log_results(it_key, "vvp", vvp_res);
         

ivtest/vvp_reg.py

@@ -45,7 +45,9 @@ def process_test(item: list) -> str:
         'source'        : it_dict['source'],
         'modulename'    : None,
         'gold'          : it_dict.get('gold', None),
-        'diff'          : None
+        'diff'          : None,
+        'vvp_args'          : it_dict.get('vvp-args', [ ]),
+        'vvp_args_extended' : it_dict.get('vvp-args-extended', [ ])
     }
 
     if it_type == "NI":

ivtest/vvp_tests/dumpfile.json

@@ -0,0 +1,6 @@
+{
+    "type" : "normal",
+    "source" : "dumpfile.v",
+    "gold"   : "dumpfile",
+    "vvp-args-extended" : [ "-vcd", "-dumpfile=foo" ]
+}