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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-only
# Copyright © 2019 Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
# Use pahole to produce output from BTF and from DWARF, then do a diff
# Use --flat_arrays with DWARF as BTF, like CTF, flattens arrays.
# Use --show_private_classes as BTF shows all structs, while pahole knows
# if some struct is defined only inside another struct/class or in a function,
# this information is not available when loading from BTF.
if [ $# -eq 0 ] ; then
echo "Usage: btfdiff <filename_with_DWARF_and_maybe_BTF_info> [<filename_with_BTF_info>]"
exit 1
fi
dwarf_input=$1
btf_input=$dwarf_input
if [ $# -eq 2 ] ; then
btf_input=$2
fi
btf_output=$(mktemp /tmp/btfdiff.btf.XXXXXX)
dwarf_output=$(mktemp /tmp/btfdiff.dwarf.XXXXXX)
pahole_bin=${PAHOLE-"pahole"}
${pahole_bin} -E -F dwarf \
--flat_arrays \
--sort \
--jobs \
--suppress_aligned_attribute \
--suppress_force_paddings \
--suppress_packed \
--lang_exclude rust \
--show_private_classes $dwarf_input > $dwarf_output &
dwarf=$!
${pahole_bin} -E -F btf \
--sort \
--suppress_aligned_attribute \
--suppress_packed \
$btf_input > $btf_output
wait $dwarf
diff -up $dwarf_output $btf_output
rm -f $btf_output $dwarf_output
exit 0
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