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#!/usr/bin/env python3
# DESCRIPTION: Verilator: Verilog Test driver/expect definition
#
# Copyright 2025 by Wilson Snyder. 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-License-Identifier: LGPL-3.0-only OR Artistic-2.0
import vltest_bootstrap
import os
test.scenarios('vlt_all')
test.sim_time = 2000000
root = ".."
if not os.path.exists(root + "/.git"):
test.skip("Not in a git repository")
# Read expected source lines hit
expectedLines = set()
with open(root + "/src/V3DfgBreakCycles.cpp", 'r', encoding="utf8") as fd:
for lineno, line in enumerate(fd, 1):
line = line.split("//")[0]
if re.match(r'^[^#]*SET_RESULT', line):
expectedLines.add(lineno)
if re.match(r'^[^#]*MASK', line):
expectedLines.add(lineno)
if not expectedLines:
test.error("Failed to read expected source line numbers")
# Generate the equivalence checks and declaration boilerplate
rdFile = test.top_filename
plistFile = test.obj_dir + "/portlist.vh"
pdeclFile = test.obj_dir + "/portdecl.vh"
checkFile = test.obj_dir + "/checks.h"
nExpectedCycles = 0
with open(rdFile, 'r', encoding="utf8") as rdFh, \
open(plistFile, 'w', encoding="utf8") as plistFh, \
open(pdeclFile, 'w', encoding="utf8") as pdeclFh, \
open(checkFile, 'w', encoding="utf8") as checkFh:
for line in rdFh:
line, _, cmt = line.partition("//")
cmt, _, _ = cmt.partition("//")
if "UNOPTFLAT" in cmt:
nExpectedCycles += 1
m = re.search(r'`signal\((\w+),', line)
if not m:
continue
sig = m.group(1)
plistFh.write(sig + ",\n")
pdeclFh.write("output " + sig + ";\n")
checkFh.write("if (ref." + sig + " != opt." + sig + ") {\n")
checkFh.write(" std::cout << \"Mismatched " + sig + "\" << std::endl;\n")
checkFh.write(" std::cout << \"Ref: 0x\" << std::hex << (ref." + sig +
" + 0) << std::endl;\n")
checkFh.write(" std::cout << \"Opt: 0x\" << std::hex << (opt." + sig +
" + 0) << std::endl;\n")
checkFh.write(" std::exit(1);\n")
checkFh.write("}\n")
# Compile un-optimized
test.compile(verilator_flags2=[
"--stats",
"--build",
"-fno-dfg-break-cycles",
"+incdir+" + test.obj_dir,
"-Mdir", test.obj_dir + "/obj_ref",
"--prefix", "Vref",
"-Wno-UNOPTFLAT"
]) # yapf:disable
# Check we got the expected number of circular logic warnings
test.file_grep(test.obj_dir + "/obj_ref/Vref__stats.txt",
r'Warnings, Suppressed UNOPTFLAT\s+(\d+)', nExpectedCycles)
# Compile optimized - also builds executable
test.compile(verilator_flags2=[
"--stats",
"--build",
"-fno-dfg-post-inline",
"-fno-dfg-scoped",
"--exe",
"+incdir+" + test.obj_dir,
"-Mdir", test.obj_dir + "/obj_opt",
"--prefix", "Vopt",
"-Werror-UNOPTFLAT",
"--dumpi-V3DfgBreakCycles", "9", # To fill code coverage
"--debug", "--debugi", "0", "--dumpi-tree", "0",
"-CFLAGS \"-I .. -I ../obj_ref\"",
"../obj_ref/Vref__ALL.a",
"../../t/" + test.name + ".cpp"
]) # yapf:disable
# Check all source lines hit
coveredLines = set()
def readCovered(fileName):
if not os.path.exists(fileName):
test.error_keep_going("Missing coverage file: " + fileName)
return
with open(fileName, 'r', encoding="utf8") as fd:
for line in fd:
coveredLines.add(int(line.strip()))
readCovered(test.obj_dir + "/obj_opt/Vopt__V3DfgBreakCycles-TraceDriver-line-coverage.txt")
readCovered(test.obj_dir + "/obj_opt/Vopt__V3DfgBreakCycles-IndependentBits-line-coverage.txt")
if coveredLines != expectedLines:
for n in sorted(expectedLines - coveredLines):
test.error_keep_going(f"V3DfgBreakCycles.cpp line {n} not covered")
for n in sorted(coveredLines - expectedLines):
test.error_keep_going(f"V3DfgBreakCycles.cpp line {n} covered but not expected")
test.file_grep_not(test.obj_dir + "/obj_opt/Vopt__stats.txt",
r'DFG.*non-representable.*\s[1-9]\d*$')
# Execute test to check equivalence
test.execute(executable=test.obj_dir + "/obj_opt/Vopt")
test.passes()
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