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#!/usr/bin/env perl
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
use strict;
use diagnostics;
$^W = 1;
my $rev = '$Id$';
$rev =~ s/\$//g;
$rev =~ s/,v//g;
$rev =~ s/Id: //;
use Getopt::Std;
my %options;
getopts('i:o:', \%options);
my ($binname, $need_uscorefix, $outputfile, $nsyms, $ostype, $nm_prog);
my %symmap;
$binname = $ARGV[0];
$need_uscorefix = 0;
if ($options{'o'}) {
$outputfile = $options{'o'};
} else {
$outputfile = "symtbl.c";
}
# OS-depending configuration
$nm_prog = "nm";
$ostype = `uname -s`;
chop($ostype);
if ($options{'i'}) {
open(SYMBOLS, $options{'i'}) || die "failed to open $options{'i'}";
} else {
open(SYMBOLS, "$nm_prog $binname |") ||
die "failed to invoke utility to get symbols";
}
open(TBLFILE, ">$outputfile") || die "failed to open output file: $outputfile";
$nsyms = 0;
while (<SYMBOLS>) {
my ($addr, $symbol) = (0, "");
# *BSDs, Linux, etc.
if (/([0-9a-f]*)\s[tT]\s(.*)/) {
($addr, $symbol) = ($1, $2);
# heuristics: some compilers add a "_" to all program
# defined symbols. Detect and fix it for a well known
# symbol of "main".
$need_uscorefix = 1 if ($symbol eq "_main");
}
if ($symbol ne "") {
next if ($symmap{$addr});
$symmap{$addr} = $symbol;
$nsyms++;
}
}
sub lhex {
my $la = substr($a, -8);
my $lb = substr($b, -8);
my $ha = substr($a, 0, length($a) - length($la));
my $hb = substr($b, 0, length($b) - length($lb));
$ha = "0" if ($ha eq "");
$ha = "0" if ($hb eq "");
if (hex($ha) != hex($hb)) {
$la = $ha;
$lb = $hb;
}
hex($la) <=> hex($lb)
}
print TBLFILE "/*\n * Generated by $rev \n */\n";
print TBLFILE "#include <isc/backtrace.h>\n";
print TBLFILE "const int isc__backtrace_nsymbols = $nsyms;\n";
print TBLFILE "const isc_backtrace_symmap_t isc__backtrace_symtable[] = {\n";
foreach (sort lhex keys(%symmap)) {
my ($addr, $symbol) = ($_, $symmap{$_});
if ($need_uscorefix && $symbol =~ /^_(.*)/) {
$symbol = $1;
}
print TBLFILE "\t{ (void *)0x$addr, \"$symbol\" },\n";
}
print TBLFILE "\t{ (void *)0x0, \"\" },\n";
print TBLFILE "};\n";
close(TBLFILE);
close(SYMBOLS);
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