#!/bin/sh -efu
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# Copyright (c) 2018 Dmitry V. Levin <ldv@altlinux.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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input="$1"
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shift
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cat <<EOF
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/* Generated by $0 from $input; do not edit. */
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#include "defs.h"
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#ifdef HAVE_LINUX_BPF_H
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# include <linux/bpf.h>
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# include "bpf_attr.h"
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# include "static_assert.h"
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# define SoM(type_, member_) (sizeof(((type_ *)0)->member_))
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EOF
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for struct in $(sed -n 's/^struct \([^[:space:]]\+_struct\) .*/\1/p' < "$input"); do
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case "$struct" in
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BPF_*) type_name='union bpf_attr' ;;
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*) type_name="struct ${struct%_struct}" ;;
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esac
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TYPE_NAME="$(printf %s "$type_name" |tr '[:lower:] ' '[:upper:]_')"
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enum="$(sed -n 's/^struct '"$struct"' \/\* \([^[:space:]]\+\) \*\/ {.*/\1/p' < "$input")"
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ENUM="$(printf %s "$enum" |tr '[:lower:]' '[:upper:]')"
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enum="$enum${enum:+.}"
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ENUM="$ENUM${ENUM:+_}"
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sed -n '/^struct '"$struct"' [^{]*{/,/^};$/p' < "$input" |
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sed -n 's/^[[:space:]]\+[^][;]*[[:space:]]\([^][[:space:];]\+\)\(\[[^;]*\]\)\?;$/\1/p' |
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while read field; do
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FIELD="$(printf %s "$field" |tr '[:lower:]' '[:upper:]')"
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cat <<EOF
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# ifdef HAVE_${TYPE_NAME}_$ENUM$FIELD
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static_assert(SoM(struct $struct, $field) == SoM($type_name, $enum$field),
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"$struct.$field size mismatch");
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static_assert(offsetof(struct $struct, $field) == offsetof($type_name, $enum$field),
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"$struct.$field offset mismatch");
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# endif /* HAVE_${TYPE_NAME}_$ENUM$FIELD */
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EOF
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done
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cat <<EOF
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static_assert(${struct}_size == expected_${struct}_size,
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"${struct}_size mismatch");
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EOF
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done
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cat <<'EOF'
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#endif /* HAVE_LINUX_BPF_H */
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EOF
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