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diff_nm_sizes.py

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"""This script diffs two dumps of symbol sizes by matching up the symbol names

To generate the input files do something like:

arm-none-eabi-nm --size-sort build-bluemicro833/firmware.elf > new_sizes.txt

The command will vary by board and along with git state.

To print the diff do:

python diff_nm_sizes.py old_sizes.txt new_sizes.txt

"""

import sys

import pathlib

old = pathlib.Path(sys.argv[-2])

new = pathlib.Path(sys.argv[-1])

old_symbols = {}

old_total_size = 0

longest_symbol = 0

for line in old.read_text().split("\n"):

if not line:

continue

size, t, name = line.split()

old_size = int(size, 16)

old_total_size += old_size

old_symbols[name] = old_size

longest_symbol = max(longest_symbol, len(name))

new_total_size = 0

for line in new.read_text().split("\n"):

if not line:

continue

size, t, name = line.split()

size = int(size, 16)

new_total_size += size

if name not in old_symbols:

print(f"{name:<{longest_symbol}}{size:>+6}")

else:

old_size = old_symbols[name]

del old_symbols[name]

if size == old_size:

continue

print(f"{name:<{longest_symbol}}{size - old_size:>+6}")

for name in old_symbols:

old_size = old_symbols[name]

print(f"{name:<{longest_symbol}}{-old_size:>+6}")

print()

total_label = f"Total {new_total_size} - {old_total_size}"

print(f"{total_label:<{longest_symbol}}{new_total_size - old_total_size:>+6}")