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#!/bin/sh
set -e
test $# -ge 1
lowercase () { printf '%s\n' "$*" | tr '[A-Z]' '[a-z]'; }
symbols="$(lowercase "$1")"
shift 1
trailing_zeroes () {
r=0
x=$1
while (( (x & 1) == 0 )); do
: $(( r++ ))
x=$(( x >> 1 ))
done
if (( x > 1 )); then
printf 'Invalid bitmask value: %s = %#x: multiple bits set\n' $2 $1 >&2
exit 1
fi
printf '%i\n' $r
}
ifzero=
printf 'static const char *\n'
printf 'extract_symbol_%s(struct libsyscalls_symbol_printer_data *data, ' "$symbols"
printf 'unsigned long long int *valuep, char *fallback_out) /* 1 */\n'
printf '{\n'
printf ' const char *ret;\n'
printf ' signed char bit = trailing_zeroes(*valuep);\n'
printf ' *fallback_out = %s;\n' "'x'"
printf ' switch (bit) {\n'
while read name value; do
if test $value = 0; then ifzero="$name"; continue; fi
printf ' case %i: ret = "%s"; break;\n' $(trailing_zeroes $value $name) $name
done
if test -n "$ifzero"; then
printf ' case -1: return "%s";\n' $ifzero
fi
printf ' default:\n'
if test $# -ge 1; then
for use; do
printf ' if ((ret = extract_symbol_%s(data, valuep, fallback_out))) return ret;\n' "$(lowercase "$use")"
done
fi
printf ' return NULL;\n'
printf ' }\n'
printf ' *valuep ^= 1ULL << (unsigned)bit;\n'
if test $# = 0; then
printf ' (void) data;\n'
fi
printf ' return ret;\n'
printf '}\n'
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