sys/kern/vnode_if.sh

#!/bin/sh -
#
# Copyright (c) 1992, 1993
#	The Regents of the University of California.  All rights reserved.
#
# %sccs.include.redist.sh%
#
# from: $NetBSD: vnode_if.sh,v 1.4.2.1 1994/07/15 22:32:01 cgd Exp $
#
SCRIPT_ID='@(#)vnode_if.sh	8.4 (Berkeley) 08/11/94'

# Script to produce VFS front-end sugar.
#
# usage: vnode_if.sh srcfile
#	(where srcfile is currently /sys/kern/vnode_if.src)
#

if [ $# -ne 1 ] ; then
	echo 'usage: vnode_if.sh srcfile'
	exit 1
fi

# Name of the source file.
src=$1

# Names of the created files.
out_c=vnode_if.c
out_h=vnode_if.h

# Awk program (must support nawk extensions)
# Use "awk" at Berkeley, "nawk" or "gawk" elsewhere.
awk=${AWK:-awk}

# Does this awk have a "toupper" function? (i.e. is it GNU awk)
isgawk=`$awk 'BEGIN { print toupper("true"); exit; }' 2>/dev/null`

# If this awk does not define "toupper" then define our own.
if [ "$isgawk" = TRUE ] ; then
	# GNU awk provides it.
	toupper=
else
	# Provide our own toupper()
	toupper='
function toupper(str) {
	_toupper_cmd = "echo "str" |tr a-z A-Z"
	_toupper_cmd | getline _toupper_str;
	close(_toupper_cmd);
	return _toupper_str;
}'
fi

#
# This is the common part of all awk programs that read $src
# This parses the input for one function into the arrays:
#	argdir, argtype, argname, willrele
# and calls "doit()" to generate output for the function.
#
# Input to this parser is pre-processed slightly by sed
# so this awk parser doesn't have to work so hard.  The
# changes done by the sed pre-processing step are:
#	insert a space beween * and pointer name
#	replace semicolons with spaces
#
sed_prep='s:\*\([^\*/]\):\* \1:g
s/;/ /'
awk_parser='
# Comment line
/^#/	{ next; }
# First line of description
/^vop_/	{
	name=$1;
	argc=0;
	next;
}
# Last line of description
/^}/	{
	doit();
	next;
}
# Middle lines of description
{
	argdir[argc] = $1; i=2;
	if ($2 == "WILLRELE") {
		willrele[argc] = 1;
		i++;
	} else
		willrele[argc] = 0;
	argtype[argc] = "";
	while (i < NF) {
		argtype[argc] = argtype[argc]$i;
		if (substr($i, length($i), 1) != "*")
			argtype[argc] = argtype[argc]" ";
		i++;
	}
	argname[argc] = $i;
	argc++;
	next;
}
'

# This is put after the copyright on each generated file.
warning="
/*
 * Warning: This file is generated automatically.
 * (Modifications made here may easily be lost!)
 *
 * Created by the script:
 *	${SCRIPT_ID}
 */
"


#
# Redirect stdout to the H file.
#
echo "$0: Creating $out_h" 1>&2
exec > $out_h

# Begin stuff
echo "$copyright"
echo "$warning"
echo '
extern struct vnodeop_desc vop_default_desc;
'

# Body stuff
# This awk program needs toupper() so define it if necessary.
sed -e "$sed_prep" $src | $awk "$toupper"'
function doit() {
	# Declare arg struct, descriptor.
	printf("\nstruct %s_args {\n", name);
	printf("\tstruct vnodeop_desc *a_desc;\n");
	for (i=0; i<argc; i++) {
		printf("\t%sa_%s;\n", argtype[i], argname[i]);
	}
	printf("};\n");
	printf("extern struct vnodeop_desc %s_desc;\n", name);
	# Define inline function.
	printf("static __inline int %s(", toupper(name));
	for (i=0; i<argc; i++) {
		printf("%s", argname[i]);
		if (i < (argc-1)) printf(", ");
	}
	printf(")\n");
	for (i=0; i<argc; i++) {
		printf("\t%s%s;\n", argtype[i], argname[i]);
	}
	printf("{\n\tstruct %s_args a;\n\n", name);
	printf("\ta.a_desc = VDESC(%s);\n", name);
	for (i=0; i<argc; i++) {
		printf("\ta.a_%s = %s;\n", argname[i], argname[i]);
	}
	printf("\treturn (VCALL(%s%s, VOFFSET(%s), &a));\n}\n",
		argname[0], arg0special, name);
}
BEGIN	{
	arg0special="";
}
END	{
	printf("\n/* Special cases: */\n#include <sys/buf.h>\n");
	argc=1;
	argtype[0]="struct buf *";
	argname[0]="bp";
	arg0special="->b_vp";
	name="vop_strategy";
	doit();
	name="vop_bwrite";
	doit();
}
'"$awk_parser"

# End stuff
echo '
/* End of special cases. */'


#
# Redirect stdout to the C file.
#
echo "$0: Creating $out_c" 1>&2
exec > $out_c

# Begin stuff
echo "$copyright"
echo "$warning"
echo '
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/vnode.h>

struct vnodeop_desc vop_default_desc = {
	0,
	"default",
	0,
	NULL,
	VDESC_NO_OFFSET,
	VDESC_NO_OFFSET,
	VDESC_NO_OFFSET,
	VDESC_NO_OFFSET,
	NULL,
};
'

# Body stuff
sed -e "$sed_prep" $src | $awk '
function do_offset(typematch) {
	for (i=0; i<argc; i++) {
		if (argtype[i] == typematch) {
			printf("\tVOPARG_OFFSETOF(struct %s_args, a_%s),\n",
				name, argname[i]);
			return i;
		};
	};
	print "\tVDESC_NO_OFFSET,";
	return -1;
}

function doit() {
	# Define offsets array
	printf("\nint %s_vp_offsets[] = {\n", name);
	for (i=0; i<argc; i++) {
		if (argtype[i] == "struct vnode *") {
			printf ("\tVOPARG_OFFSETOF(struct %s_args,a_%s),\n",
				name, argname[i]);
		}
	}
	print "\tVDESC_NO_OFFSET";
	print "};";
	# Define F_desc
	printf("struct vnodeop_desc %s_desc = {\n", name);
	# offset
	printf ("\t0,\n");
	# printable name
	printf ("\t\"%s\",\n", name);
	# flags
	printf("\t0");
	vpnum = 0;
	for (i=0; i<argc; i++) {
		if (willrele[i]) {
			if (argdir[i] ~ /OUT/) {
				printf(" | VDESC_VPP_WILLRELE");
			} else {
				printf(" | VDESC_VP%s_WILLRELE", vpnum);
			};
			vpnum++;
		}
	}
	print ",";
	# vp offsets
	printf ("\t%s_vp_offsets,\n", name);
	# vpp (if any)
	do_offset("struct vnode **");
	# cred (if any)
	do_offset("struct ucred *");
	# proc (if any)
	do_offset("struct proc *");
	# componentname
	do_offset("struct componentname *");
	# transport layer information
	printf ("\tNULL,\n};\n");
}
END	{
	printf("\n/* Special cases: */\n");
	argc=1;
	argdir[0]="IN";
	argtype[0]="struct buf *";
	argname[0]="bp";
	willrele[0]=0;
	name="vop_strategy";
	doit();
	name="vop_bwrite";
	doit();
}
'"$awk_parser"

# End stuff
echo '
/* End of special cases. */'

# Add the vfs_op_descs array to the C file.
# Begin stuff
echo '
struct vnodeop_desc *vfs_op_descs[] = {
	&vop_default_desc,	/* MUST BE FIRST */
	&vop_strategy_desc,	/* XXX: SPECIAL CASE */
	&vop_bwrite_desc,	/* XXX: SPECIAL CASE */
'

# Body stuff
sed -e "$sed_prep" $src | $awk '
function doit() {
	printf("\t&%s_desc,\n", name);
}
'"$awk_parser"

# End stuff
echo '	NULL
};
'

exit 0

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