162 lines
4.5 KiB
Python
Executable File
162 lines
4.5 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (c) 2017 Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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"""
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gperf C file post-processor
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We use gperf to build up a perfect hashtable of pointer values. The way gperf
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does this is to create a table 'wordlist' indexed by a string repreesentation
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of a pointer address, and then doing memcmp() on a string passed in for
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comparison
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We are exclusively working with 4-byte pointer values. This script adjusts
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the generated code so that we work with pointers directly and not strings.
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This saves a considerable amount of space.
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"""
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import sys
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import argparse
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import os
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import re
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from distutils.version import LooseVersion
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# --- debug stuff ---
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def debug(text):
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if not args.verbose:
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return
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sys.stdout.write(os.path.basename(sys.argv[0]) + ": " + text + "\n")
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def error(text):
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sys.stderr.write(os.path.basename(sys.argv[0]) + " ERROR: " + text + "\n")
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sys.exit(1)
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def warn(text):
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sys.stdout.write(
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os.path.basename(
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sys.argv[0]) +
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" WARNING: " +
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text +
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"\n")
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def reformat_str(match_obj):
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addr_str = match_obj.group(0)
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# Nip quotes
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addr_str = addr_str[1:-1]
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addr_vals = [0, 0, 0, 0]
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ctr = 3
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i = 0
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while True:
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if i >= len(addr_str):
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break
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if addr_str[i] == "\\":
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if addr_str[i + 1].isdigit():
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# Octal escape sequence
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val_str = addr_str[i + 1:i + 4]
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addr_vals[ctr] = int(val_str, 8)
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i += 4
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else:
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# Char value that had to be escaped by C string rules
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addr_vals[ctr] = ord(addr_str[i + 1])
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i += 2
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else:
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addr_vals[ctr] = ord(addr_str[i])
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i += 1
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ctr -= 1
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return "(char *)0x%02x%02x%02x%02x" % tuple(addr_vals)
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def process_line(line, fp):
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if line.startswith("#"):
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fp.write(line)
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return
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# Set the lookup function to static inline so it gets rolled into
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# _k_object_find(), nothing else will use it
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if re.search(args.pattern + " [*]$", line):
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fp.write("static inline " + line)
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return
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m = re.search("gperf version (.*) [*][/]$", line)
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if m:
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v = LooseVersion(m.groups()[0])
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v_lo = LooseVersion("3.0")
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v_hi = LooseVersion("3.1")
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if (v < v_lo or v > v_hi):
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warn("gperf %s is not tested, versions %s through %s supported" %
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(v, v_lo, v_hi))
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# Replace length lookups with constant len of 4 since we're always
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# looking at pointers
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line = re.sub(r'lengthtable\[key\]', r'4', line)
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# Empty wordlist entries to have NULLs instead of ""
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line = re.sub(r'[{]["]["][}]', r'{}', line)
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# Suppress a compiler warning since this table is no longer necessary
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line = re.sub(r'static unsigned char lengthtable',
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r'static unsigned char __unused lengthtable', line)
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# drop all use of register keyword, let compiler figure that out,
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# we have to do this since we change stuff to take the address of some
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# parameters
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line = re.sub(r'register', r'', line)
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# Hashing the address of the string
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line = re.sub(r"hash [(]str, len[)]",
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r"hash((const char *)&str, len)", line)
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# Just compare pointers directly instead of using memcmp
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if re.search("if [(][*]str", line):
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fp.write(" if (str == s)\n")
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return
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# Take the strings with the binary information for the pointer values,
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# and just turn them into pointers
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line = re.sub(r'["].*["]', reformat_str, line)
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fp.write(line)
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def parse_args():
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global args
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parser = argparse.ArgumentParser(
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description=__doc__,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument("-i", "--input", required=True,
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help="Input C file from gperf")
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parser.add_argument("-o", "--output", required=True,
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help="Output C file with processing done")
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parser.add_argument("-p", "--pattern", required=True,
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help="Search pattern for objects")
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parser.add_argument("-v", "--verbose", action="store_true",
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help="Print extra debugging information")
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args = parser.parse_args()
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if "VERBOSE" in os.environ:
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args.verbose = 1
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def main():
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parse_args()
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with open(args.input, "r") as in_fp, open(args.output, "w") as out_fp:
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for line in in_fp.readlines():
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process_line(line, out_fp)
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if __name__ == "__main__":
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main()
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