#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-only
# Copyright © 2019 Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
# Use pfunct to produce compilable output from a object, then do a codiff -s
# To see if the type information generated from source code generated
# from type information in a file compiled from the original source code matches.

if [ $# -eq 0 ] ; then
	echo "Usage: fullcircle <filename_with_type_info>"
	exit 1
fi

file=$1

nr_cus=$(readelf -wi ${file} | grep DW_TAG_compile_unit | wc -l)
if [ $nr_cus -gt 1 ]; then
	exit 0
fi

c_output=$(mktemp /tmp/fullcircle.XXXXXX.c)
o_output=$(mktemp /tmp/fullcircle.XXXXXX.o)
pfunct_bin=${PFUNCT-"pfunct"}
codiff_bin=${CODIFF-"codiff"}

# See how your DW_AT_producer looks like and find the
# right regexp to get after the GCC version string, this one
# seems good enough for Red Hat/Fedora/CentOS that look like:
#
#   DW_AT_producer    : (indirect string, offset: 0x3583): GNU C89 8.2.1 20181215 (Red Hat 8.2.1-6) -mno-sse -mno-mmx 
#
# So we need from -mno-sse onwards

CFLAGS=$(readelf -wi $file | grep -w DW_AT_producer | sed -r      's/.*\)( -[[:alnum:]]+.*)+/\1/g')

# Check if we managed to do the sed or if this is something like GNU AS
[ "${CFLAGS/DW_AT_producer/}" != "${CFLAGS}" ] && exit

${pfunct_bin} --compile $file > $c_output
gcc $CFLAGS -c -g $c_output -o $o_output
${codiff_bin} -q -s $file $o_output

rm -f $c_output $o_output
exit 0