Add option to use xilinx simulator in tests. Not recommended - simulator is pretty awful

test/lib/simulators/modelsim.py

@@ -0,0 +1,61 @@
+from typing import List
+import subprocess
+import os
+
+from . import Simulator
+
+class ModelSim(Simulator):
+    def compile(self) -> None:
+        cmd = [
+            "vlog", "-sv", "-quiet", "-l", "build.log",
+
+            # Free version of ModelSim throws errors if generate/endgenerate
+            # blocks are not used.
+            # These have been made optional long ago. Modern versions of SystemVerilog do
+            # not require them and I prefer not to add them.
+            "-suppress", "2720",
+
+            # Ignore noisy warning about vopt-time checking of always_comb/always_latch
+            "-suppress", "2583",
+        ]
+
+        # Add source files
+        cmd.extend(self.tb_files)
+
+        # Run command!
+        subprocess.run(cmd, check=True)
+
+
+    def run(self, plusargs:List[str] = None) -> None:
+        plusargs = plusargs or []
+
+        test_name = self.testcase_cls_inst.request.node.name
+
+        # call vsim
+        cmd = [
+            "vsim", "-quiet",
+            "-msgmode", "both",
+            "-do", "set WildcardFilter [lsearch -not -all -inline $WildcardFilter Memory]",
+            "-do", "log -r /*;",
+            "-do", "run -all; exit;",
+            "-c",
+            "-l", "%s.log" % test_name,
+            "-wlf", "%s.wlf" % test_name,
+            "tb",
+        ]
+        for plusarg in plusargs:
+            cmd.append("+" + plusarg)
+        subprocess.run(cmd, check=True)
+
+        self.assertSimLogPass("%s.log" % test_name)
+
+
+    def assertSimLogPass(self, path: str):
+        self.testcase_cls_inst.assertTrue(os.path.isfile(path))
+
+        with open(path, encoding="utf-8") as f:
+            for line in f:
+                if line.startswith("# ** Error"):
+                    self.testcase_cls_inst.fail(line)
+                elif line.startswith("# ** Fatal"):
+                    self.testcase_cls_inst.fail(line)