ghdl_interface: with ghdl_e, save runtime args to JSON file

vunit/sim_if/ghdl.py

@@ -8,11 +8,13 @@
 Interface for GHDL simulator
 """
 
+from pathlib import Path
 from os.path import exists, join, abspath
 import os
 import logging
 import subprocess
 import shlex
+from json import dump
 from sys import stdout  # To avoid output catched in non-verbose mode
 from warnings import warn
 from ..exceptions import CompileError
@@ -277,6 +279,23 @@ def _get_command(self, config, output_path, elaborate_only, ghdl_e, wave_file):
             cmd += sim
             if elaborate_only:
                 cmd += ["--no-run"]
+        else:
+            try:
+                os.makedirs(output_path, mode=0o777)
+            except OSError:
+                pass
+            with open(join(output_path, "args.json"), "w") as fname:
+                dump(
+                    {
+                        "bin": str(
+                            Path(output_path)
+                            / ("%s-%s" % (config.entity_name, config.architecture_name))
+                        ),
+                        "build": cmd[1:],
+                        "sim": sim,
+                    },
+                    fname,
+                )
 
         return cmd