#!/usr/bin/env python3
"""
Purpose
This script is for comparing the size of the library files from two
different Git revisions within an Mbed TLS repository.
The results of the comparison is formatted as csv and stored at a
configurable location.
Note: must be run from Mbed TLS root.
"""
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import argparse
import os
import subprocess
import sys
class CodeSizeComparison:
"""Compare code size between two Git revisions."""
def __init__(self, old_revision, new_revision, result_dir):
"""
old_revision: revision to compare against
new_revision:
result_dir: directory for comparison result
"""
self.repo_path = "."
self.result_dir = os.path.abspath(result_dir)
os.makedirs(self.result_dir, exist_ok=True)
self.csv_dir = os.path.abspath("code_size_records/")
os.makedirs(self.csv_dir, exist_ok=True)
self.old_rev = old_revision
self.new_rev = new_revision
self.git_command = "git"
self.make_command = "make"
@staticmethod
def check_repo_path():
if not all(os.path.isdir(d) for d in ["include", "library", "tests"]):
raise Exception("Must be run from Mbed TLS root")
@staticmethod
def validate_revision(revision):
result = subprocess.check_output(["git", "rev-parse", "--verify",
revision + "^{commit}"], shell=False)
return result
def _create_git_worktree(self, revision):
"""Make a separate worktree for revision.
Do not modify the current worktree."""
if revision == "current":
print("Using current work directory.")
git_worktree_path = self.repo_path
else:
print("Creating git worktree for", revision)
git_worktree_path = os.path.join(self.repo_path, "temp-" + revision)
subprocess.check_output(
[self.git_command, "worktree", "add", "--detach",
git_worktree_path, revision], cwd=self.repo_path,
stderr=subprocess.STDOUT
)
return git_worktree_path
def _build_libraries(self, git_worktree_path):
"""Build libraries in the specified worktree."""
my_environment = os.environ.copy()
subprocess.check_output(
[self.make_command, "-j", "lib"], env=my_environment,
cwd=git_worktree_path, stderr=subprocess.STDOUT,
)
def _gen_code_size_csv(self, revision, git_worktree_path):
"""Generate code size csv file."""
csv_fname = revision + ".csv"
if revision == "current":
print("Measuring code size in current work directory.")
else:
print("Measuring code size for", revision)
result = subprocess.check_output(
["size library/*.o"], cwd=git_worktree_path, shell=True
)
size_text = result.decode()
csv_file = open(os.path.join(self.csv_dir, csv_fname), "w")
for line in size_text.splitlines()[1:]:
data = line.split()
csv_file.write("{}, {}\n".format(data[5], data[3]))
def _remove_worktree(self, git_worktree_path):
"""Remove temporary worktree."""
if git_worktree_path != self.repo_path:
print("Removing temporary worktree", git_worktree_path)
subprocess.check_output(
[self.git_command, "worktree", "remove", "--force",
git_worktree_path], cwd=self.repo_path,
stderr=subprocess.STDOUT
)
def _get_code_size_for_rev(self, revision):
"""Generate code size csv file for the specified git revision."""
# Check if the corresponding record exists
csv_fname = revision + ".csv"
if (revision != "current") and \
os.path.exists(os.path.join(self.csv_dir, csv_fname)):
print("Code size csv file for", revision, "already exists.")
else:
git_worktree_path = self._create_git_worktree(revision)
self._build_libraries(git_worktree_path)
self._gen_code_size_csv(revision, git_worktree_path)
self._remove_worktree(git_worktree_path)
def compare_code_size(self):
"""Generate results of the size changes between two revisions,
old and new. Measured code size results of these two revisions
must be available."""
old_file = open(os.path.join(self.csv_dir, self.old_rev + ".csv"), "r")
new_file = open(os.path.join(self.csv_dir, self.new_rev + ".csv"), "r")
res_file = open(os.path.join(self.result_dir, "compare-" + self.old_rev
+ "-" + self.new_rev + ".csv"), "w")
res_file.write("file_name, this_size, old_size, change, change %\n")
print("Generating comparison results.")
old_ds = {}
for line in old_file.readlines()[1:]:
cols = line.split(", ")
fname = cols[0]
size = int(cols[1])
if size != 0:
old_ds[fname] = size
new_ds = {}
for line in new_file.readlines()[1:]:
cols = line.split(", ")
fname = cols[0]
size = int(cols[1])
new_ds[fname] = size
for fname in new_ds:
this_size = new_ds[fname]
if fname in old_ds:
old_size = old_ds[fname]
change = this_size - old_size
change_pct = change / old_size
res_file.write("{}, {}, {}, {}, {:.2%}\n".format(fname, \
this_size, old_size, change, float(change_pct)))
else:
res_file.write("{}, {}\n".format(fname, this_size))
return 0
def get_comparision_results(self):
"""Compare size of library/*.o between self.old_rev and self.new_rev,
and generate the result file."""
self.check_repo_path()
self._get_code_size_for_rev(self.old_rev)
self._get_code_size_for_rev(self.new_rev)
return self.compare_code_size()
def main():
parser = argparse.ArgumentParser(
description=(
"""This script is for comparing the size of the library files
from two different Git revisions within an Mbed TLS repository.
The results of the comparison is formatted as csv, and stored at
a configurable location.
Note: must be run from Mbed TLS root."""
)
)
parser.add_argument(
"-r", "--result-dir", type=str, default="comparison",
help="directory where comparison result is stored, \
default is comparison",
)
parser.add_argument(
"-o", "--old-rev", type=str, help="old revision for comparison.",
required=True,
)
parser.add_argument(
"-n", "--new-rev", type=str, default=None,
help="new revision for comparison, default is the current work \
directory, including uncommitted changes."
)
comp_args = parser.parse_args()
if os.path.isfile(comp_args.result_dir):
print("Error: {} is not a directory".format(comp_args.result_dir))
parser.exit()
validate_res = CodeSizeComparison.validate_revision(comp_args.old_rev)
old_revision = validate_res.decode().replace("\n", "")
if comp_args.new_rev is not None:
validate_res = CodeSizeComparison.validate_revision(comp_args.new_rev)
new_revision = validate_res.decode().replace("\n", "")
else:
new_revision = "current"
result_dir = comp_args.result_dir
size_compare = CodeSizeComparison(old_revision, new_revision, result_dir)
return_code = size_compare.get_comparision_results()
sys.exit(return_code)
if __name__ == "__main__":
main()