resolve-src-lines

#!/usr/bin/env perl

use strict;
use warnings;

my $infile = shift
    or die "No backtrace file specified.\n";

open my $in, $infile or
    die "Cannot open $infile for reading: $!\n";

my $execfile = shift
    or die "No exec file path specified.\n";

my $cached_limit = 10000;
my $cached_count = 0;
my %cached;
my $tip = 1;
while (<$in>) {
    if (/^\t\d+$/) {
        $tip = 1;
        print;
        next;
    }
    if (/^ (0x[0-9a-f]+)\b/i) {
        my $stack = $1;
        my $line = $_;

        my $frames = $cached{$stack};
        if (!$frames) {
            $frames = [];
            my $addr;
            if (!$tip) {
                no warnings 'portable';
                $addr = hex($stack);
                # XXX I don't know why I need to substract by 1,
                # but I need it to get the correct result at least with
                # gcc 4.8
                $addr = sprintf("%x", $addr - 1);

            } else {
                $addr = $stack;
            }
            my $out = `addr2line -fsip -e $execfile $addr`;
            #warn "$addr: $out";
            open my $t, "<", \$out;
            while (<$t>) {
                if (/(\w+) at (\S+:\d+)/) {
                    push @$frames, [$1, $2];
                    #warn "$1\n";
                }
            }
            close $t;
            if (++$cached_count > $cached_limit) {
                # prevent the cache from growing forever...
                %cached = ();
            }
            $cached{$stack} = $frames;
        }
        if (@$frames) {
            #warn "HIT";
            for my $fr (@$frames) {
                my ($func, $loc) = @$fr;
                print " $stack : $func($loc)+0x0/0x0 [$loc]\n";
            }


        } else {
            print $line;
        }
        #print "@frames\n";
        #print "$cnt\n";

    } else {
        print;
    }
    undef $tip;
}

close $in;