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#!/usr/bin/env python3
#
# check-units.py: check the number of compilation units and identify
# those that are rebuilt multiple times
#
# Copyright (C) 2025 Linaro Ltd.
#
# SPDX-License-Identifier: GPL-2.0-or-later
from os import access, R_OK, path
from sys import exit
import json
import argparse
from pathlib import Path
from collections import Counter
def extract_build_units(cc_path):
"""
Extract the build units and their counds from compile_commands.json file.
Returns:
Hash table of ["unit"] = count
"""
j = json.load(open(cc_path, 'r'))
files = [f['file'] for f in j]
build_units = Counter(files)
return build_units
def analyse_units(build_units, top_n):
"""
Analyse the build units and report stats and the top 10 rebuilds
"""
print(f"Total source files: {len(build_units.keys())}")
print(f"Total build units: {sum(units.values())}")
# Create a sorted list by number of rebuilds
sorted_build_units = sorted(build_units.items(),
key=lambda item: item[1],
reverse=True)
print("Most rebuilt units:")
for unit, count in sorted_build_units[:top_n]:
print(f" {unit} built {count} times")
print("Least rebuilt units:")
for unit, count in sorted_build_units[-10:]:
print(f" {unit} built {count} times")
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description="analyse number of build units in compile_commands.json")
parser.add_argument("cc_path", type=Path, default=None,
help="Path to compile_commands.json")
parser.add_argument("-n", type=int, default=20,
help="Dump the top <n> entries")
args = parser.parse_args()
if path.isfile(args.cc_path) and access(args.cc_path, R_OK):
units = extract_build_units(args.cc_path)
analyse_units(units, args.n)
exit(0)
else:
print(f"{args.cc_path} doesn't exist or isn't readable")
exit(1)
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