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#!/usr/bin/env bash
# build-aux/lint-bin - Lint final binary images
#
# Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
set -euE -o pipefail
shopt -s extglob
# There are several exisi files we can use:
#
# Binaries:
# - ${elf} : firmware image with debug symbols and relocationd data
# - ${elf%.elf}.bin : raw firmware image
# - ${elf%.elf}.hex : .bin as Intel HEX
# - ${elf%.elf}.uf2 : .bin as USB Flashing Format (UF2)
#
# Textual info:
# - ${elf%.elf}.dis : `objdump --section-headers ${elf}; objdump --disassemble ${elf}; picotool coprodis --quiet ${elf}`
# - ${elf}.map : `ld --print-map` info
# Input is `ld --print-map` format.
#
# Output is a series of lines in the format "symbol location size
# source". Whitespace may seem silly.
objdump_globals() {
sed -E -n '/^ \.t?(data|bss)\./{ / 0x/{ p; D; }; N; s/\n/ /; p; }' <"$1"
}
lint_globals() {
local in_mapfile
in_mapfile=$1
local rel_base
rel_base=${in_mapfile#build/*/}
rel_base=${rel_base%/*}
local topdir
topdir=$PWD
{
echo 'Source Symbol Size'
objdump_globals "$in_mapfile" |
{
cd "$rel_base"
total=0
while read -r symbol addr size source; do
if (( addr == 0 )); then
continue
fi
case "$source" in
/*)
# libg.a(whatever.o) -> libg.a
source="${source%(*)}"
# resolve `..` components
source="$(realpath --canonicalize-missing --no-symlinks -- "$source")"
;;
CMakeFiles/*.dir/*.@(obj|o))
# CMakeFiles/sbc_harnes_objs.dir/...
source="${source#CMakeFiles/*.dir/}"
source="${source%.@(obj|o)}"
source="${source//__/..}"
source="$(realpath --canonicalize-missing --no-symlinks --relative-to="$topdir" -- "$source")"
;;
esac
printf "%s %s 0x%04x (%'d)\n" "$source" "$symbol" "$size" "$size"
total=$((total + size))
done
printf "~ Total 0x%04x (%'d)\n" "$total" "$total"
} |
LC_COLLATE=C sort
} | column -t
}
main() {
local elf
for elf in "$@"; do
{
echo 'Global variables:'
lint_globals "${elf}.map" | sed 's/^/ /'
} > "${elf%.elf}.lint.globals"
done
}
main "$@"
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