#!/usr/bin/env python3
# DESCRIPTION: Verilator: Verilog Test driver/expect definition
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of either the GNU Lesser General Public License Version 3
# or the Perl Artistic License Version 2.0.
# SPDX-FileCopyrightText: 2026 Wilson Snyder
# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

import vltest_bootstrap

test.scenarios('dist')

# Real-world repro: a misconfigured VERILATOR_BIN that points back at the
# Perl wrapper used to fork-bomb the host. The wrapper now caps re-entry
# depth via $VERILATOR_RUNNING and aborts past the cap.
os.environ['VERILATOR_BIN'] = os.environ["VERILATOR_ROOT"] + "/bin/verilator"

# --no-unlimited-stack avoids the ulimit_stack_unlimited() backtick branch,
# which would otherwise double the recursion fanout. Linear re-entry through
# run() is enough to exercise the depth-cap abort.
test.run(
    fails=True,
    cmd=[os.environ["VERILATOR_ROOT"] + "/bin/verilator", "--no-unlimited-stack", "--version"],
    logfile=test.run_log_filename)

test.file_grep(test.run_log_filename,
               r'%Error: verilator: re-entered \d+ levels deep via \$VERILATOR_RUNNING')

test.passes()
