| 1 | #!/usr/bin/env python3 |
| 2 | # |
| 3 | # check-units.py: check the number of compilation units and identify |
| 4 | # those that are rebuilt multiple times |
| 5 | # |
| 6 | # Copyright (C) 2025 Linaro Ltd. |
| 7 | # |
| 8 | # SPDX-License-Identifier: GPL-2.0-or-later |
| 9 | |
| 10 | from os import access, R_OK, path |
| 11 | from sys import exit |
| 12 | import json |
| 13 | import argparse |
| 14 | from pathlib import Path |
| 15 | from collections import Counter |
| 16 | |
| 17 | |
| 18 | def extract_build_units(cc_path): |
| 19 | """ |
| 20 | Extract the build units and their counds from compile_commands.json file. |
| 21 | |
| 22 | Returns: |
| 23 | Hash table of ["unit"] = count |
| 24 | """ |
| 25 | |
| 26 | j = json.load(open(cc_path, 'r')) |
| 27 | files = [f['file'] for f in j] |
| 28 | build_units = Counter(files) |
| 29 | |
| 30 | return build_units |
| 31 | |
| 32 | |
| 33 | def analyse_units(build_units, top_n): |
| 34 | """ |
| 35 | Analyse the build units and report stats and the top 10 rebuilds |
| 36 | """ |
| 37 | |
| 38 | print(f"Total source files: {len(build_units.keys())}") |
| 39 | print(f"Total build units: {sum(units.values())}") |
| 40 | |
| 41 | # Create a sorted list by number of rebuilds |
| 42 | sorted_build_units = sorted(build_units.items(), |
| 43 | key=lambda item: item[1], |
| 44 | reverse=True) |
| 45 | |
| 46 | print("Most rebuilt units:") |
| 47 | for unit, count in sorted_build_units[:top_n]: |
| 48 | print(f" {unit} built {count} times") |
| 49 | |
| 50 | print("Least rebuilt units:") |
| 51 | for unit, count in sorted_build_units[-10:]: |
| 52 | print(f" {unit} built {count} times") |
| 53 | |
| 54 | |
| 55 | if __name__ == "__main__": |
| 56 | parser = argparse.ArgumentParser( |
| 57 | description="analyse number of build units in compile_commands.json") |
| 58 | parser.add_argument("cc_path", type=Path, default=None, |
| 59 | help="Path to compile_commands.json") |
| 60 | parser.add_argument("-n", type=int, default=20, |
| 61 | help="Dump the top <n> entries") |
| 62 | |
| 63 | args = parser.parse_args() |
| 64 | |
| 65 | if path.isfile(args.cc_path) and access(args.cc_path, R_OK): |
| 66 | units = extract_build_units(args.cc_path) |
| 67 | analyse_units(units, args.n) |
| 68 | exit(0) |
| 69 | else: |
| 70 | print(f"{args.cc_path} doesn't exist or isn't readable") |
| 71 | exit(1) |