source: mainline/tools/autogen.py@ 32e3cdf

#!/usr/bin/env python
#
# Copyright (c) 2014 Jakub Jermar 
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

import sys
import json
import re

def usage():
        print("%s - Automated structure and offsets generator" % sys.argv[0])
        print("%s file.ag probe|generate struct.ag" % sys.argv[0])
        sys.exit()

def generate_includes(struct):
        code = ""
        for i in range(len(struct['includes'])):
                code = code + "#include %s\n" % struct['includes'][i]
        return code.strip()

def generate_struct(struct):
        code = "typedef struct %s {\n" % struct['name']
        for i in range(len(struct['members'])):
                member = struct['members'][i]
                code = code + "\t%s %s;\n" % (member['type'], member['name'])
        code = code + "} %s_t;" % struct['name']
        return code

def generate_probes(struct):
        code = ""
        for i in range(len(struct['members'])):
                member = struct['members'][i]
                code = code + ("\temit_constant(%s_OFFSET_%s, offsetof(%s_t, %s));\n" % 
                    (struct['name'].upper(), member['name'].upper(), struct['name'],
                    member['name']))
        return code

def probe(struct):
        name = struct['name']
        typename = struct['name'] + "_t"

        code = """
%s              

#define str(s) #s
#define emit_constant(n, v) \
    asm volatile ("EMITTED_CONSTANT " str(n) \" = %%0\" :: \"i\" (v))
#define offsetof(t, m) ((size_t) &(((t *) 0)->m))

%s

int main()
{
%s
        emit_constant(%s_SIZE, sizeof(%s));
        return 0;
}
        """ % (generate_includes(struct), generate_struct(struct),
            generate_probes(struct), name.upper(), typename)

        return code

def generate_defines(pairs):
        code = ""
        for pair in pairs:
                code = code + "#define %s %s\n" % (pair[0], pair[1])
        return code.strip()

def generate(struct, lines):
        code = """
/***************************************************************************** 
 * AUTO-GENERATED FILE, DO NOT EDIT!!!
 * Generated by: tools/autogen.py
 * Generated from: %s
 *****************************************************************************/

#ifndef AUTOGEN_%s_H
#define AUTOGEN_%s_H

#ifndef __ASM__
%s
#endif

%s

#ifndef __ASM__
%s
#endif

#endif
        """ % (sys.argv[2], struct['name'].upper(), struct['name'].upper(),
            generate_includes(struct), generate_defines(lines),
            generate_struct(struct))

        return code

def filter_pairs(lines):
        pattern = re.compile("^\tEMITTED_CONSTANT ([A-Z_]*) = \$([0-9]*)$");
        pairs = []
        for line in lines:
                res = pattern.match(line)
                if res == None:
                        continue
                pairs = pairs + [res.group(1, 2)]
        return pairs
        

def run():
        if len(sys.argv) != 3:
                usage()

        with open(sys.argv[2], "rb") as fp:
                struct = json.load(fp)

        if sys.argv[1] == "probe":
                code = probe(struct)
                print(code)
        elif sys.argv[1] == "generate":
                lines = sys.stdin.readlines()
                pairs = filter_pairs(lines)
                code = generate(struct, pairs)
                print(code)
        else:
                usage()

run()