Move backtrace parser from src/Backtrace to lib/Utils.

Move abrt-backtrace app from src/Backtrace/main.c to src/utils/abrt-backtrace.
Move backtrace preprocessign code from abrt-backtrace to the parser.
Implemented new backtrace rating algorithm.
Added old bt rating algorithm to backtrace.c
Move strbuf to lib/Utils, and updated it to use xfuncs.
Created separate header for xfuncs.
Some functions in xfuncs marked as extern "c", so they can be used
in C code.
Merged backtrace fallback (independent_backtrace) "parser" into
backtrace.{h/c}.
Added option --rate to abrt-backtrace, to be able to use the new
backtrace rating algorithm in scripts.

17 files changed, 330 insertions, 2418 deletions

diff --git a/src/Backtrace/Makefile.am b/src/Backtrace/Makefile.am
deleted file mode 100644
index c39575ca..00000000
--- a/src/Backtrace/Makefile.am
+++ /dev/null
@@ -1,24 +0,0 @@
-bin_PROGRAMS = abrt-backtrace
-
-#BUILT_SOURCES = parser.h
-#AM_YFLAGS = -d
-AM_YFLAGS = --verbose
-
-abrt_backtrace_CFLAGS = -Wall
-
-abrt_backtrace_SOURCES = \
-    main.c \
-    backtrace.h backtrace.c \
-    strbuf.h strbuf.c \
-    fallback.h fallback.c \
-    parser.y
-
-#abrt_backtrace_CPPFLAGS = \
-#    -I$(srcdir)/../../inc \
-#    -I$(srcdir)/../../lib/Utils
-
-#abrt_backtrace_LDADD = \
-#    ../../lib/Utils/libABRTUtils.la
-
-man_MANS = abrt-backtrace.1
-EXTRA_DIST = $(man_MANS)
diff --git a/src/Backtrace/abrt-bz-downloader b/src/Backtrace/abrt-bz-downloader
deleted file mode 100755
index 7f294257..00000000
--- a/src/Backtrace/abrt-bz-downloader
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/python
-# -*- mode:python -*-
-# ABRT Bugzilla Backtrace Downloader
-# Downloads all backtraces reported by ABRT from Bugzilla.
-#
-# Please do not run this script unless it's neccessary to do so. 
-# It forces Bugzilla to send data related to thousands of bug reports.
-
-from bugzilla import RHBugzilla
-from optparse import OptionParser
-import sys
-import os.path
-
-parser = OptionParser(version="%prog 1.0")
-parser.add_option("-u", "--user", dest="user",
-                  help="Bugzilla user name (REQUIRED)", metavar="USERNAME")
-parser.add_option("-p", "--password", dest="password",
-                  help="Bugzilla password (REQUIRED)", metavar="PASSWORD")
-parser.add_option("-b", "--bugzilla", dest="bugzilla",
-                  help="Bugzilla URL (defaults to Red Hat Bugzilla)", metavar="URL")
-parser.add_option("-f", "--fields",
-                  action="store_true", dest="fields", default=False,
-                  help="Print possible bug fields and exit.")
-
-(options, args) = parser.parse_args()
-
-if not options.user or len(options.user) == 0:
-  parser.error("User name is required.\nTry {0} --help".format(sys.argv[0]))
-
-if not options.password or len(options.password) == 0:
-  parser.error("Password is required.\nTry {0} --help".format(sys.argv[0]))
-
-if not options.bugzilla or len(options.bugzilla) == 0:
-  options.bugzilla = "https://bugzilla.redhat.com/xmlrpc.cgi"
-
-bz = RHBugzilla()
-bz.connect(options.bugzilla)
-bz.login(options.user, options.password)
-
-if options.fields:
-  print bz.bugfields
-  exit(0)
-
-buginfos = bz.query({'status_whiteboard_type':'allwordssubstr','status_whiteboard':'abrt_hash'})
-
-print "{0} bugs found.".format(len(buginfos))
-
-for buginfo in buginfos:
-  # Skip bugs with already downloaded backtraces.
-  filename = "{0}.bt".format(buginfo.bug_id)
-  if os.path.isfile(filename):
-    print "Skipping {0} (already exists).".format(filename)
-    continue
-
-  # Skip bugs with broken or Python backtraces
-  broken_backtrace_bugs = [ 517116, # binary file :)
-                            518516, # not a backtrace, GDB fail
-                            524259, # multiple backtraces in single file
-                            524427, # multiple backtraces in single file
-                            528529, # just [New Thread xx] lines
-                            #528915, 10000 frames, out of memory, to be fixed
-                            #529422, 10000 frames, out of memory, to be fixed
-                            #530239, 10000 frames, out of memory, to be fixed
-                            532264, # no header
-                            533475, # no backtrace
-                            #537819, 50000 frames, out of memory, to be fixed
-                            #539699, to be fixed, parser bug
-                            539992] # completely broken backtrace
-  if buginfo.bug_id in broken_backtrace_bugs:
-    continue
-
-  # Get backtrace from bug and store it as a file.
-  bug = bz.getbug(buginfo.bug_id)
-  for attachment in bug.attachments:
-    if attachment['filename'] == 'backtrace':
-      data = bz.openattachment(attachment['id'])
-      f = open(filename, 'w')
-      f.write(data.read())
-      f.close()
-      print "Attachment {0} downloaded.".format(filename)
-
-bz.logout()
diff --git a/src/Backtrace/abrt-bz-dupchecker b/src/Backtrace/abrt-bz-dupchecker
deleted file mode 100755
index 654a3702..00000000
--- a/src/Backtrace/abrt-bz-dupchecker
+++ /dev/null
@@ -1,272 +0,0 @@
-#!/usr/bin/python
-# -*- mode:python -*-
-# ABRT Bugzilla Duplication Checker
-# Downloads all backtraces reported by ABRT from Bugzilla,
-# and search for duplicates using the newest ABRT duplication 
-# checker.
-#
-# Some bugs in Bugzilla were reported by older ABRT
-# versions, which had poor duplication detection.
-#
-# Please do not run this script unless it's neccessary to do so. 
-# It forces Bugzilla to send data related to thousands of bug reports.
-#
-#
-# Useful text to be pasted to Bugzilla:
-"""
-This bug appears to have been filled using a buggy version of ABRT, because
-it contains unusable backtrace. Sorry for the inconvenience.
-Closing as INSUFFICIENT_DATA.
-"""
-
-from bugzilla import RHBugzilla
-from optparse import OptionParser
-import sys
-import os.path
-import subprocess
-import cPickle
-import urllib
-import json
-
-parser = OptionParser(version="%prog 1.0")
-parser.add_option("-u", "--user", dest="user",
-                  help="Bugzilla user name (REQUIRED)", metavar="USERNAME")
-parser.add_option("-p", "--password", dest="password",
-                  help="Bugzilla password (REQUIRED)", metavar="PASSWORD")
-parser.add_option("-b", "--bugzilla", dest="bugzilla", default="https://bugzilla.redhat.com/xmlrpc.cgi",
-                  help="Bugzilla URL (defaults to Red Hat Bugzilla)", metavar="URL")
-parser.add_option("-v", "--verbose", dest="verbose",
-                  help="Detailed output")
-parser.add_option("-c", "--close", help="Close some of the bugs in Bugzilla (DANGEROUS)", 
-                  action="store_true", default=False, dest="close")
-parser.add_option("-i", "--wiki", help="Generate output in wiki syntax", 
-                  action="store_true", default=False, dest="wiki")
-
-(options, args) = parser.parse_args()
-
-if not options.user or len(options.user) == 0:
-  parser.error("User name is required.\nTry {0} --help".format(sys.argv[0]))
-
-if not options.password or len(options.password) == 0:
-  parser.error("Password is required.\nTry {0} --help".format(sys.argv[0]))
-
-bz = RHBugzilla()
-bz.connect(options.bugzilla)
-bz.login(options.user, options.password)
-
-buginfos = bz.query({'status_whiteboard_type':'allwordssubstr','status_whiteboard':'abrt_hash'})
-
-print "{0} bugs found.".format(len(buginfos))
-
-#
-# Load cache from previous run. Speeds up the case Bugzilla closes connection.
-# The cache should be manually removed after a day or so, because the data in it 
-# are no longer valid.
-#
-database = {}
-ids = {}
-CACHE_FILE = "abrt-bz-dupchecker-cache.tmp"
-if os.path.isfile(CACHE_FILE):
-  f = open(CACHE_FILE, 'r')
-  database = cPickle.load(f)
-  ids = cPickle.load(f)
-  f.close()
-
-def save_to_cache():
-  global database
-  f = open(CACHE_FILE, 'w')
-  cPickle.dump(database, f, 2)
-  cPickle.dump(ids, f, 2)
-  f.close()  
-
-count = 0
-for buginfo in buginfos:
-  count += 1
-  print "{0}/{1}".format(count, len(buginfos))
-  if count % 100 == 0:
-    save_to_cache()
-
-  if ids.has_key(buginfo.bug_id):
-    continue
-
-  ids[buginfo.bug_id] = True
-
-  if not buginfo.bug_status in ["NEW", "ASSIGNED", "MODIFIED", "VERIFIED"]:
-    if options.verbose:
-      print "Bug {0} has status {1}, skipping.".format(buginfo.bug_id, buginfo.bug_status)
-    continue
-
-  bug = bz.getbug(buginfo.bug_id)
-
-  # Skip bugs with already downloaded backtraces.
-  filename = "{0}.bt".format(buginfo.bug_id)
-  if os.path.isfile(filename):
-    if options.verbose:
-      print "Skipping {0} (already exists).".format(filename)
-  else:
-    # Get backtrace from bug and store it as a file.
-    downloaded = False
-    for attachment in bug.attachments:
-      if attachment['filename'] == 'backtrace':
-        data = bz.openattachment(attachment['id'])
-        f = open(filename, 'w')
-        f.write(data.read())
-        f.close()
-        downloaded = True
-        if options.verbose:
-          print "Attachment {0} downloaded.".format(filename)
-
-    # Silently skip bugs without backtrace.
-    # Those are usually duplicates of bugs; the duplication copies
-    # abrt_hash, but it does not copy the attachment.
-    if not downloaded:
-      continue
-  
-  command = ["./abrt-backtrace"]
-  command.append(filename)
-  command.append("--single-thread")
-  command.append("--frame-depth=5")
-  command.append("--remove-exit-handlers")
-  command.append("--remove-noncrash-frames")
-
-  helper = subprocess.Popen(command, stdout=subprocess.PIPE)
-  backtrace, err = helper.communicate()
-  helper.wait()
-
-  if helper.returncode != 0:
-    print "Problems parsing {0}".format(filename)
-    continue
-
-  # Empty backtrace is provided by Python apps.
-  if len(backtrace) == 0:
-    continue
-
-  bugitem = {'id':buginfo.bug_id, 'comments':len(bug.longdescs)}
-  if backtrace in database:
-    components = database[backtrace]
-    if buginfo.component in components:
-      components[buginfo.component].append(bugitem)
-      if options.verbose:
-        print "Duplicate found: {0}".format(database[out]['id'])
-        print "Backtrace: {0}".format(out)
-    else:
-      components[buginfo.component] = [ bugitem ]
-  else:
-    database[backtrace] = { buginfo.component: [ bugitem ] }
-
-# The number of duplicates.
-dupcount = 0
-# The number of duplicates that can be closed.
-dupclosecount = 0
-for backtrace, components in database.items():
-  for component, bugitems in components.items():
-    dupcount += len(bugitems) - 1
-    dupclosecount += min(len(filter(lambda x: x <= 2, 
-                                    map(lambda x: x["comments"], 
-                                        bugitems))),
-                         len(bugitems) - 1)
-
-# Get the component owner.    
-# Sort the duplicates by the component owner, and
-# filter out those which should not be printed.
-dups = []
-for backtrace, components in database.items():
-  for component, bugitems in components.items():
-    if len(bugitems) <= 1:
-      continue
-
-    # Get the component owner
-    owner = "Failed to get component owner"
-    try:
-      component_info = json.load(urllib.urlopen("https://admin.fedoraproject.org/pkgdb/packages/name/{0}?tg_format=json".format(component)))
-      component_packages = component_info['packageListings']
-      component_f12 = filter(lambda x:x["collection"]["version"]=="12", component_packages)
-      if len(component_f12) == 1:
-        owner = component_f12[0]["owner"]
-    except KeyError:
-      pass
-      
-    dups.append((component, owner, bugitems, backtrace))
-    print "."
-
-# Close all bugs where it is appropriate.
-if options.close:
-  LIMIT = 1000
-  counter = 0
-  for (component, owner, bugitems, backtrace) in dups:
-    # Find the master bug item
-    # Its the one with the most comments.
-    
-    # Sort function sorting by comment count.
-    def commentCmp(x, y):
-      if x['comments'] < y['comments']:
-        return 1
-      elif x['comments'] == y['comments']: 
-        # Sort by bug id, older bugs should became the master bug
-        if x['id'] > y['id']:
-          return 1
-        elif x['id'] == y['id']:
-          return 0
-        else:
-          return -1
-      else:
-        return -1
-
-    sorteditems = sorted(bugitems, commentCmp)
-
-    master = sorteditems[0]
-    for item in sorteditems[1:]:
-      if item['comments'] > 2:
-        continue
-
-      bug = bz.getbug(int(item['id']))
-      # Check the bug status AGAIN to make sure the bug is still opened.
-      if not bug.bug_status in ["NEW", "ASSIGNED"]:
-        continue
-
-      print "Closing bug #{0} with {1} comments as a duplicate of #{2}.".format(item['id'], item['comments'], master['id'])
-      bug.close("DUPLICATE", int(master['id']), "", 
-                ("This bug appears to have been filled using a buggy version of ABRT, because\n" +
-                "it contains a backtrace which is a duplicate of backtrace from bug #{0}.\n\n" +
-                "Sorry for the inconvenience.").format(master['id']))
-
-      counter += 1
-      if counter > LIMIT:
-        sys.exit(0)
-      
-bz.logout()
-
-print
-print "SUMMARY"
-print "=========================================================================="
-print "Total number of duplicate bugs detected: {0}".format(dupcount)
-print "Number of duplicate bugs that will be closed : {0}".format(dupclosecount)
-print "------------------------------"
-
-# Print the duplicates sorted by package owner.
-def cmp(x, y):
-  if x[1] < y[1]:
-    return -1
-  elif x[1] == y[1]:
-    return 0
-  else:
-    return 1
-
-for (component, owner, bugitems, backtrace) in sorted(dups, cmp):
-  if options.wiki:
-    print "----"
-    print "* component: '''{0}''' ({1})".format(component, owner)
-    print "* duplicates: {0}".format(
-      reduce(lambda x,y: x+", "+y, 
-             map(lambda x: "#[https://bugzilla.redhat.com/show_bug.cgi?id={0} {0}] ({1} comments)".format(x['id'],x['comments']), 
-                 bugitems)))
-    print "* backtrace:"
-    for line in backtrace.replace("Thread\n", "").splitlines():
-      print "*# {0}".format(line)
-  else:
-    print "Component: {0} ({1})".format(component, owner)
-    print "Duplicates: {0}".format(
-      reduce(lambda x,y: x+", "+y, 
-             map(lambda x: "{0} ({1})".format(x['id'],x['comments']), 
-                 bugitems)))
-    print "Backtrace: {0}".format(backtrace)
diff --git a/src/Backtrace/abrt-bz-hashchecker b/src/Backtrace/abrt-bz-hashchecker
deleted file mode 100755
index ec7ce1a6..00000000
--- a/src/Backtrace/abrt-bz-hashchecker
+++ /dev/null
@@ -1,59 +0,0 @@
-#!/usr/bin/python
-# -*- mode:python -*-
-# Checks how many bugs in Bugzilla have the same hash.
-#
-# Please do not run this script unless it's neccessary to do so. 
-# It forces Bugzilla to send data related to thousands of bug reports.
-
-from bugzilla import RHBugzilla
-from optparse import OptionParser
-import sys
-import os.path
-import subprocess
-import re
-
-parser = OptionParser(version="%prog 1.0")
-parser.add_option("-u", "--user", dest="user",
-                  help="Bugzilla user name (REQUIRED)", metavar="USERNAME")
-parser.add_option("-p", "--password", dest="password",
-                  help="Bugzilla password (REQUIRED)", metavar="PASSWORD")
-parser.add_option("-b", "--bugzilla", dest="bugzilla",
-                  help="Bugzilla URL (defaults to Red Hat Bugzilla)", metavar="URL")
-
-(options, args) = parser.parse_args()
-
-if not options.user or len(options.user) == 0:
-  parser.error("User name is required.\nTry {0} --help".format(sys.argv[0]))
-
-if not options.password or len(options.password) == 0:
-  parser.error("Password is required.\nTry {0} --help".format(sys.argv[0]))
-
-if not options.bugzilla or len(options.bugzilla) == 0:
-  options.bugzilla = "https://bugzilla.redhat.com/xmlrpc.cgi"
-
-bz = RHBugzilla()
-bz.connect(options.bugzilla)
-bz.login(options.user, options.password)
-
-buginfos = bz.query({'status_whiteboard_type':'allwordssubstr','status_whiteboard':'abrt_hash'})
-
-print "{0} bugs found.".format(len(buginfos))
-
-hashes = {}
-for buginfo in buginfos:
-    match = re.search("abrt_hash:([^ ]+)", buginfo.status_whiteboard)
-    if not match:
-      continue
-    hash = match.group(1)
-    if not hash:
-      continue
-    if hash in hashes:
-        hashes[hash].append(buginfo.bug_id)
-    else:
-        hashes[hash] = [ buginfo.bug_id ]
-    print hash
-bz.logout()
-
-for hash, ids in hashes.items():
-    if len(ids) > 1:
-      print "Duplicates found: ", reduce(lambda x,y: str(x)+", "+str(y), ids)
diff --git a/src/Backtrace/backtrace.c b/src/Backtrace/backtrace.c
deleted file mode 100644
index 9b697da1..00000000
--- a/src/Backtrace/backtrace.c
+++ /dev/null
@@ -1,533 +0,0 @@
-/* -*-mode:c++;c-file-style:"bsd";c-basic-offset:2;indent-tabs-mode:nil-*-
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#include "backtrace.h"
-#include <stdlib.h>
-#include <string.h>
-
-struct frame *frame_new()
-{
-  struct frame *f = malloc(sizeof(struct frame));
-  if (!f)
-  {
-    puts("Error while allocating memory for backtrace frame.");
-    exit(5);
-  }
-
-  f->function = NULL;
-  f->number = 0;
-  f->sourcefile = NULL;
-  f->signal_handler_called = false;
-  f->next = NULL;
-  return f;
-}
-
-void frame_free(struct frame *f)
-{
-  if (f->function)
-    free(f->function);
-  if (f->sourcefile)
-    free(f->sourcefile);
-  free(f);
-}
-
-struct frame *frame_add_sibling(struct frame *a, struct frame *b)
-{
-  struct frame *aa = a;
-  while (aa->next)
-    aa = aa->next;
-
-  aa->next = b;
-  return a;
-}
-
-static void frame_print_tree(struct frame *frame, bool verbose)
-{
-  if (verbose)
-    printf(" #%d", frame->number);
-  else
-    printf(" ");
-
-  if (frame->function)
-    printf(" %s", frame->function);
-  if (frame->sourcefile)
-  {
-    if (frame->function)
-      printf(" at");
-    printf(" %s", frame->sourcefile);
-  }
-
-  if (frame->signal_handler_called)
-    printf(" <signal handler called>");
-
-  puts(""); /* newline */
-}
-
-static bool frame_is_exit_handler(struct frame *frame)
-{
-  return (frame->function
-	  && frame->sourcefile
-	  && 0 == strcmp(frame->function, "__run_exit_handlers")
-	  && NULL != strstr(frame->sourcefile, "exit.c"));
-}
-
-/* Checks if a frame contains abort function used
- * by operating system to exit application.
- * E.g. in C it's called "abort" or "raise".
- */
-static bool frame_is_abort_frame(struct frame *frame)
-{
-  if (!frame->function || !frame->sourcefile)
-    return false;
-
-  if (0 == strcmp(frame->function, "raise") 
-      && (NULL != strstr(frame->sourcefile, "pt-raise.c")
-          || NULL != strstr(frame->sourcefile, "/libc.so.6")))
-    return true;
-  else if (0 == strcmp(frame->function, "exit")
-           && NULL != strstr(frame->sourcefile, "exit.c"))
-    return true;
-  else if (0 == strcmp(frame->function, "abort")
-           && (NULL != strstr(frame->sourcefile, "abort.c")
-               || NULL != strstr(frame->sourcefile, "/libc.so.6")))
-    return true;
-  else if (frame_is_exit_handler(frame))
-    return true;
-  
-  return false;
-}
-
-static bool frame_is_noncrash_frame(struct frame *frame)
-{
-  /* Abort frames. */
-  if (frame_is_abort_frame(frame))
-    return true;
-
-  if (!frame->function)
-    return false;
-
-  if (0 == strcmp(frame->function, "__kernel_vsyscall"))
-    return true;
-
-  if (0 == strcmp(frame->function, "__assert_fail"))
-    return true;
-
-  if (!frame->sourcefile)
-    return false;
-
-  /* GDK */
-  if (0 == strcmp(frame->function, "gdk_x_error") 
-      && 0 == strcmp(frame->sourcefile, "gdkmain-x11.c"))
-    return true;
-
-  /* X.org */
-  if (0 == strcmp(frame->function, "_XReply") 
-      && 0 == strcmp(frame->sourcefile, "xcb_io.c"))
-    return true;
-  if (0 == strcmp(frame->function, "_XError") 
-      && 0 == strcmp(frame->sourcefile, "XlibInt.c"))
-    return true;
-  if (0 == strcmp(frame->function, "XSync") 
-      && 0 == strcmp(frame->sourcefile, "Sync.c"))
-    return true;
-  if (0 == strcmp(frame->function, "process_responses") 
-      && 0 == strcmp(frame->sourcefile, "xcb_io.c"))
-    return true;
-
-  /* glib */
-  if (0 == strcmp(frame->function, "IA__g_log") 
-      && 0 == strcmp(frame->sourcefile, "gmessages.c"))
-    return true;
-  if (0 == strcmp(frame->function, "IA__g_logv") 
-      && 0 == strcmp(frame->sourcefile, "gmessages.c"))
-    return true;
-  if (0 == strcmp(frame->function, "IA__g_assertion_message") 
-      && 0 == strcmp(frame->sourcefile, "gtestutils.c"))
-    return true;
-  if (0 == strcmp(frame->function, "IA__g_assertion_message_expr") 
-      && 0 == strcmp(frame->sourcefile, "gtestutils.c"))
-    return true;
-
-  /* DBus */
-  if (0 == strcmp(frame->function, "gerror_to_dbus_error_message") 
-      && 0 == strcmp(frame->sourcefile, "dbus-gobject.c"))
-    return true;
-  if (0 == strcmp(frame->function, "dbus_g_method_return_error") 
-      && 0 == strcmp(frame->sourcefile, "dbus-gobject.c"))
-    return true;
-
-  /* libstdc++ */
-  if (0 == strcmp(frame->function, "__gnu_cxx::__verbose_terminate_handler") 
-      && NULL != strstr(frame->sourcefile, "/vterminate.cc"))
-    return true;
-  if (0 == strcmp(frame->function, "__cxxabiv1::__terminate") 
-      && NULL != strstr(frame->sourcefile, "/eh_terminate.cc"))
-    return true;
-  if (0 == strcmp(frame->function, "std::terminate") 
-      && NULL != strstr(frame->sourcefile, "/eh_terminate.cc"))
-    return true;
-  if (0 == strcmp(frame->function, "__cxxabiv1::__cxa_throw") 
-      && NULL != strstr(frame->sourcefile, "/eh_throw.cc"))
-    return true;
-
-  return false;
-}
-
-struct thread *thread_new()
-{
-  struct thread *t = malloc(sizeof(struct thread));
-  if (!t)
-  {
-    puts("Error while allocating memory for backtrace thread.");
-    exit(5);
-  }
-
-  t->number = 0;
-  t->frames = NULL;
-  t->next = NULL;
-  return t;
-}
-
-void thread_free(struct thread *t)
-{
-  while (t->frames)
-  {
-    struct frame *rm = t->frames;
-    t->frames = rm->next;
-    frame_free(rm);
-  }
-
-  free(t);
-}
-
-struct thread *thread_add_sibling(struct thread *a, struct thread *b)
-{
-  struct thread *aa = a;
-  while (aa->next)
-    aa = aa->next;
-
-  aa->next = b;
-  return a;
-}
-
-static int thread_get_frame_count(struct thread *thread)
-{
-  struct frame *f = thread->frames;
-  int count = 0;
-  while (f)
-  {
-    f = f->next;
-    ++count;
-  }
-  return count;
-}
-
-static void thread_print_tree(struct thread *thread, bool verbose)
-{
-  int framecount = thread_get_frame_count(thread);
-  if (verbose)
-    printf("Thread no. %d (%d frames)\n", thread->number, framecount);
-  else
-    printf("Thread\n");
-  struct frame *frame = thread->frames;
-  while (frame)
-  {
-    frame_print_tree(frame, verbose);
-    frame = frame->next;
-  }
-}
-
-/*
- * Checks whether the thread it contains some known "abort" function.
- * If a frame with the function is found, it is returned.
- * If there are multiple frames with abort function, the lowest 
- * one is returned.
- * Nonrecursive.
- */
-static struct frame *thread_find_abort_frame(struct thread *thread)
-{
-  struct frame *frame = thread->frames;
-  struct frame *result = NULL;
-  while (frame)
-  {
-    if (frame_is_abort_frame(frame))
-      result = frame;
-  
-    frame = frame->next;
-  }
-
-  return result;
-}
-
-static void thread_remove_exit_handlers(struct thread *thread)
-{
-  struct frame *frame = thread->frames;
-  while (frame)
-  {
-    if (frame_is_exit_handler(frame))
-    {
-      /* Delete all frames from the beginning to this frame. */
-      while (thread->frames != frame)
-      {
-        struct frame *rm = thread->frames;
-        thread->frames = thread->frames->next;
-        frame_free(rm);
-      }
-      return;
-    }
-
-    frame = frame->next;
-  }
-}
-
-void thread_remove_noncrash_frames(struct thread *thread)
-{
-  struct frame *prev = NULL;
-  struct frame *cur = thread->frames;
-  while (cur)
-  {
-    if (frame_is_noncrash_frame(cur))
-    {
-      /* This frame must be skipped, because it will 
-         be deleted. */
-      if (prev)
-	prev->next = cur->next;
-      else
-	thread->frames = cur->next;
-
-      frame_free(cur);
-
-      /* Set cur to be valid, as it will be used to 
-         advance to next item. */
-      if (prev)
-	cur = prev;
-      else
-      {
-	cur = thread->frames;
-        continue;
-      }
-    }
-
-    prev = cur;
-    cur = cur->next;
-  }
-}
-
-struct backtrace *backtrace_new()
-{
-  struct backtrace *bt = malloc(sizeof(struct backtrace));
-  if (!bt)
-  {
-    puts("Error while allocating memory for backtrace.");
-    exit(5);
-  }
-
-  bt->threads = NULL;
-  bt->crash = NULL;
-  return bt;
-}
-
-void backtrace_free(struct backtrace *bt)
-{
-  while (bt->threads)
-  {
-    struct thread *rm = bt->threads;
-    bt->threads = rm->next;
-    thread_free(rm);
-  }
-
-  if (bt->crash)
-    frame_free(bt->crash);
-
-  free(bt);
-}
-
-static int backtrace_get_thread_count(struct backtrace *bt)
-{
-  struct thread *t = bt->threads;
-  int count = 0;
-  while (t)
-  {
-    t = t->next;
-    ++count;
-  }
-  return count;
-}
-
-void backtrace_print_tree(struct backtrace *backtrace, bool verbose)
-{
-  if (verbose)
-    printf("Thread count: %d\n", backtrace_get_thread_count(backtrace));
-
-  if (backtrace->crash && verbose)
-  {
-    printf("Crash frame: ");
-    frame_print_tree(backtrace->crash, verbose);
-  }
-
-  struct thread *thread = backtrace->threads;
-  while (thread)
-  {
-    thread_print_tree(thread, verbose);
-    thread = thread->next;
-  }
-}
-
-void backtrace_remove_threads_except_one(struct backtrace *backtrace, 
-					 struct thread *one)
-{
-  while (backtrace->threads)
-  {
-    struct thread *rm = backtrace->threads;
-    backtrace->threads = rm->next;
-    if (rm != one)
-      thread_free(rm);
-  }
-
-  one->next = NULL;
-  backtrace->threads = one;
-}
-
-/*
- * Loop through all threads and if a single one contains the crash frame on the top,
- * return it. Otherwise, return NULL.
- *
- * If require_abort is true, it is also required that the thread containing 
- * the crash frame contains some known "abort" function. In this case there can be
- * multiple threads with the crash frame on the top, but only one of them might
- * contain the abort function to succeed.
- */
-static struct thread *backtrace_find_crash_thread_from_crash_frame(struct backtrace *backtrace,
-								   bool require_abort)
-{
-  /*
-   * This code can be extended to compare something else when the function
-   * name is not available.
-   */
-  if (!backtrace->threads || !backtrace->crash || !backtrace->crash->function)
-    return NULL;
-
-  struct thread *result = NULL;
-  struct thread *thread = backtrace->threads;
-  while (thread)
-  {
-    if (thread->frames 
-	&& thread->frames->function
-	&& 0 == strcmp(thread->frames->function, backtrace->crash->function)
-        && (!require_abort || thread_find_abort_frame(thread)))
-    {
-      if (result == NULL)
-	result = thread;
-      else
-      {
-	/* Second frame with the same function. Failure. */
-	return NULL;
-      }
-    }
-
-    thread = thread->next;
-  }
-  
-  return result;
-}
-
-struct thread *backtrace_find_crash_thread(struct backtrace *backtrace)
-{
-  /* If there is no thread, be silent and report NULL. */
-  if (!backtrace->threads)
-    return NULL;
-  
-  /* If there is just one thread, it is simple. */
-  if (!backtrace->threads->next)
-    return backtrace->threads;
-
-  /* If we have a crash frame *and* there is just one thread which has 
-   * this frame on the top, it is also simple. 
-   */
-  struct thread *thread;
-  thread = backtrace_find_crash_thread_from_crash_frame(backtrace, false);
-  if (thread)
-    return thread;
-
-  /* There are multiple threads with a frame indistinguishable from 
-   * the crash frame on the top of stack.
-   * Try to search for known abort functions.
-   */
-  thread = backtrace_find_crash_thread_from_crash_frame(backtrace, true);
-  
-  return thread; /* result or null */
-}
-
-void backtrace_limit_frame_depth(struct backtrace *backtrace, int depth)
-{
-  if (depth <= 0)
-    return;
-
-  struct thread *thread = backtrace->threads;
-  while (thread)
-  {
-    struct frame *frame = thread_find_abort_frame(thread);
-    if (frame)
-      frame = frame->next; /* Start counting from the frame following the abort fr. */
-    else
-      frame = thread->frames; /* Start counting from the first frame. */
-
-    /* Skip some frames to get the required stack depth. */
-    int i = depth;
-    struct frame *last_frame = NULL;
-    while (frame && i)
-    {
-      last_frame = frame;
-      frame = frame->next;
-      --i;
-    }
-
-    /* Delete the remaining frames. */
-    if (last_frame)
-      last_frame->next = NULL;
-
-    while (frame)
-    {
-      struct frame *rm = frame;
-      frame = frame->next;
-      frame_free(rm);
-    }
-
-    thread = thread->next;
-  }
-}
-
-void backtrace_remove_exit_handlers(struct backtrace *backtrace)
-{
-  struct thread *thread = backtrace->threads;
-  while (thread)
-  {
-    thread_remove_exit_handlers(thread);
-    thread = thread->next;
-  }  
-}
-
-void backtrace_remove_noncrash_frames(struct backtrace *backtrace)
-{
-  struct thread *thread = backtrace->threads;
-  while (thread)
-  {
-    thread_remove_noncrash_frames(thread);
-    thread = thread->next;
-  }  
-}
-
diff --git a/src/Backtrace/backtrace.h b/src/Backtrace/backtrace.h
deleted file mode 100644
index 93897e93..00000000
--- a/src/Backtrace/backtrace.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#ifndef BACKTRACE_H
-#define BACKTRACE_H
-
-#include <stdio.h>
-#include <stdbool.h>
-
-struct frame
-{
-  /* Function name, or NULL. */
-  char *function;
-  /* Frame number. */
-  int number;
-  /* Name of the source file, or binary file, or NULL. */
-  char *sourcefile;
-  bool signal_handler_called;
-  /* Sibling frame, or NULL if this is the last frame in a thread. */
-  struct frame *next;
-};
-
-struct thread
-{
-  int number;
-  struct frame *frames;
-  /* Sibling thread, or NULL if this is the last thread in a backtrace. */
-  struct thread *next;
-};
-
-struct backtrace
-{
-  struct thread *threads;
-  /* 
-   * The frame where the crash happened according to GDB. 
-   * It might be that we can not tell to which thread this frame belongs,
-   * because all threads end with mutually indistinguishable frames.
-   */
-  struct frame *crash;
-};
-
-extern struct frame *frame_new();
-extern void frame_free(struct frame *f);
-extern struct frame *frame_add_sibling(struct frame *a, struct frame *b);
-
-extern struct thread *thread_new();
-extern void thread_free(struct thread *t);
-extern struct thread *thread_add_sibling(struct thread *a, struct thread *b);
-
-extern struct backtrace *backtrace_new();
-extern void backtrace_free(struct backtrace *bt);
-
-/* Prints how internal backtrace representation looks to stdout. */
-extern void backtrace_print_tree(struct backtrace *backtrace, bool verbose);
-
-/* 
- * Frees all threads except the one provided as parameters. 
- * It does not check whether one is a member of backtrace.
- * Caller must know that.
- */
-extern void backtrace_remove_threads_except_one(struct backtrace *backtrace, 
-						struct thread *one);
-
-/* 
- * Search all threads and tries to find the one that caused the crash. 
- * It might return NULL if the thread cannot be determined.
- */
-extern struct thread *backtrace_find_crash_thread(struct backtrace *backtrace);
-
-extern void backtrace_limit_frame_depth(struct backtrace *backtrace, int depth);
-
-/*
- * Exit handlers are all stack frames above  __run_exit_handlers()
- */
-extern void backtrace_remove_exit_handlers(struct backtrace *backtrace);
-
-/*
- * Removes frames known as not causing crash, but that are often 
- * a part of a backtrace.
- */
-extern void backtrace_remove_noncrash_frames(struct backtrace *backtrace);
-
-/* Defined in parser.y. */
-extern struct backtrace *do_parse(char *input, bool debug_parser, bool debug_scanner);
-
-#endif
diff --git a/src/Backtrace/check-bt-parsability b/src/Backtrace/check-bt-parsability
deleted file mode 100755
index a5018bfa..00000000
--- a/src/Backtrace/check-bt-parsability
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/bash
-# -*- mode: bash -*-
-
-PASS=0
-FAIL=0
-for file in *.bt
-do
-  #echo "$file"
-  ./abrt-backtrace $file 1> /dev/null
-  if [ "$?" -eq "0" ]
-  then
-      echo -n "."
-      PASS=$(($PASS+1))
-  else
-      echo "-$file"
-      FAIL=$(($FAIL+1))
-  fi
-done 
-echo ""
-echo "Passed $PASS and failed $FAIL."
diff --git a/src/Backtrace/fallback.c b/src/Backtrace/fallback.c
deleted file mode 100644
index 77a16283..00000000
--- a/src/Backtrace/fallback.c
+++ /dev/null
@@ -1,174 +0,0 @@
-/*
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#include "fallback.h"
-#include <stdlib.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-#include <ctype.h>
-
-struct header
-{
-  struct strbuf *text;
-  struct header *next;
-};
-
-static struct header *header_new()
-{
-  struct header *head = malloc(sizeof(struct header));
-  if (!head)
-  {
-    puts("Error while allocating memory for backtrace header.");
-    exit(5);
-  }
-  head->text = NULL;
-  head->next = NULL;
-  return head;
-}
-
-/* Recursively frees siblings. */
-static void header_free(struct header *head)
-{
-  if (head->text)
-    strbuf_free(head->text);
-  if (head->next)
-    header_free(head->next);
-  free(head);
-}
-
-/* Inserts new header to array if it is not already there. */
-static void header_set_insert(struct header *cur, struct strbuf *new)
-{
-  /* Duplicate found case. */
-  if (strcmp(cur->text->buf, new->buf) == 0)
-    return;
-
-  /* Last item case, insert new header here. */
-  if (cur->next == NULL)
-  {
-    cur->next = header_new();
-    cur->next->text = new;
-    return;
-  }
-
-  /* Move to next item in array case. */
-  header_set_insert(cur->next, new);
-}
-
-struct strbuf *independent_backtrace(char *input)
-{
-  struct strbuf *header = strbuf_new();
-  bool in_bracket = false;
-  bool in_quote = false;
-  bool in_header = false;
-  bool in_digit = false;
-  bool has_at = false;
-  bool has_filename = false;
-  bool has_bracket = false;
-  struct header *headers = NULL;
-
-  const char *bk = input;
-  while (*bk)
-  {
-    if (bk[0] == '#'
-	&& bk[1] >= '0' && bk[1] <= '7'
-	&& bk[2] == ' ' /* take only #0...#7 (8 last stack frames) */
-	&& !in_quote) 
-    {
-      if (in_header && !has_filename)
-	strbuf_clear(header);
-      in_header = true;
-    }
-
-    if (!in_header)
-    {
-      ++bk;
-      continue;
-    }
-
-    if (isdigit(*bk) && !in_quote && !has_at)
-      in_digit = true;
-    else if (bk[0] == '\\' && bk[1] == '\"')
-      bk++;
-    else if (*bk == '\"')
-      in_quote = in_quote == true ? false : true;
-    else if (*bk == '(' && !in_quote)
-    {
-      in_bracket = true;
-      in_digit = false;
-      strbuf_append_char(header, '(');
-    }
-    else if (*bk == ')' && !in_quote)
-    {
-      in_bracket = false;
-      has_bracket = true;
-      in_digit = false;
-      strbuf_append_char(header, '(');
-    }
-    else if (*bk == '\n' && has_filename)
-    {
-      if (headers == NULL)
-      {
-	headers = header_new();
-	headers->text = header;
-      }
-      else
-	header_set_insert(headers, header);
-
-      header = strbuf_new();
-      in_bracket = false;
-      in_quote = false;
-      in_header = false;
-      in_digit = false;
-      has_at = false;
-      has_filename = false;
-      has_bracket = false;
-    }
-    else if (*bk == ',' && !in_quote)
-      in_digit = false;
-    else if (isspace(*bk) && !in_quote)
-      in_digit = false;
-    else if (bk[0] == 'a' && bk[1] == 't' && has_bracket && !in_quote)
-    {
-      has_at = true;
-      strbuf_append_char(header, 'a');
-    }
-    else if (bk[0] == ':' && has_at && isdigit(bk[1]) && !in_quote)
-      has_filename = true;
-    else if (in_header && !in_digit && !in_quote && !in_bracket)
-      strbuf_append_char(header, *bk);
-    
-    bk++;
-  }
-  
-  strbuf_free(header);
-
-  struct strbuf *result = strbuf_new();
-  struct header *loop = headers;
-  while (loop)
-  {
-    strbuf_append_str(result, loop->text->buf);
-    strbuf_append_char(result, '\n');
-    loop = loop->next;
-  }
-
-  if (headers)
-    header_free(headers); /* recursive */
-
-  return result;
-}
diff --git a/src/Backtrace/fallback.h b/src/Backtrace/fallback.h
deleted file mode 100644
index 85b06320..00000000
--- a/src/Backtrace/fallback.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#ifndef FALLBACK_H
-#define FALLBACK_H
-
-#include "strbuf.h"
-#include <stdio.h>
-
-/* 
- * Reads the input file and calculates independent backtrace from it. 
- * @returns
- *   The independent backtrace. Caller is responsible for calling
- *   strbuf_free() on it.
- */
-extern struct strbuf *independent_backtrace(char *input);
-
-#endif
diff --git a/src/Backtrace/main.c b/src/Backtrace/main.c
deleted file mode 100644
index cddf8979..00000000
--- a/src/Backtrace/main.c
+++ /dev/null
@@ -1,361 +0,0 @@
-/* -*-mode:c++;c-file-style:"bsd";c-basic-offset:2;indent-tabs-mode:nil-*-
-    main.cpp - parses command line arguments
-
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#include <argp.h>
-#include <stdlib.h>
-#include <sysexits.h>
-#include <string.h>
-#include "config.h"
-#include "backtrace.h"
-#include "fallback.h"
-
-/* Too large files are trimmed. */
-#define FILE_SIZE_LIMIT 20000000 /* ~ 20 MB */
-
-#define EX_PARSINGFAILED EX__MAX + 1  /* = 79 */
-#define EX_THREADDETECTIONFAILED EX__MAX + 2 /* = 80 */
-
-const char *argp_program_version = "abrt-backtrace " VERSION;
-const char *argp_program_bug_address = "<crash-catcher@lists.fedorahosted.org>";
-
-static char doc[] = "abrt-backtrace -- backtrace analyzer";
-
-/* A description of the arguments we accept. */
-static char args_doc[] = "FILE";
-
-static struct argp_option options[] = {
-  {"independent"           , 'i', 0  , 0, "Prints independent backtrace (fallback)"},
-  {"single-thread"         , 'n', 0  , 0, "Display the crash thread only in the backtrace"},
-  {"frame-depth"           , 'd', "N", 0, "Display only top N frames under the crash frame"},
-  {"remove-exit-handlers"  , 'r', 0  , 0, "Removes exit handler frames from the displayed backtrace"},
-  {"remove-noncrash-frames", 'm', 0  , 0, "Removes common frames known as not causing crash"},
-  {"debug-parser"          , 'p', 0  , 0, "Prints parser debug information"}, 
-  {"debug-scanner"         , 's', 0  , 0, "Prints scanner debug information"}, 
-  {"verbose"               , 'v', 0  , 0, "Print human-friendly superfluous output."}, 
-  { 0 }
-};
-
-struct arguments
-{
-  bool independent;
-  bool single_thread;
-  int frame_depth; /* negative == do not limit the depth */
-  bool remove_exit_handlers;
-  bool remove_noncrash_frames;
-  bool debug_parser;
-  bool debug_scanner;
-  bool verbose;
-  char *filename;
-};
-
-static error_t
-parse_opt (int key, char *arg, struct argp_state *state)
-{
-  /* Get the input argument from argp_parse, which we
-     know is a pointer to our arguments structure. */
-  struct arguments *arguments = (struct arguments*)state->input;
-    
-  switch (key)
-  {
-  case 'i': arguments->independent = true; break;
-  case 'n': arguments->single_thread = true; break;
-  case 'd': 
-    if (1 != sscanf(arg, "%d", &arguments->frame_depth))
-    {
-      /* Must be a number. */
-      argp_usage(state);
-      exit(EX_USAGE); /* Invalid argument */
-    }
-    break;
-  case 'r': arguments->remove_exit_handlers = true; break;
-  case 'm': arguments->remove_noncrash_frames = true; break;
-  case 'p': arguments->debug_parser = true; break;
-  case 's': arguments->debug_scanner = true; break;
-  case 'v': arguments->verbose = true; break;
-
-  case ARGP_KEY_ARG:
-    if (arguments->filename)
-    {
-      /* Too many arguments. */
-      argp_usage(state);
-      exit(EX_USAGE); /* Invalid argument */
-    }
-    arguments->filename = arg;
-    break;
-
-  case ARGP_KEY_END:
-    break;
-    
-  default:
-    return ARGP_ERR_UNKNOWN;
-  }
-  return 0;
-}
-
-/* Our argp parser. */
-static struct argp argp = { options, parse_opt, args_doc, doc };
-
-#define PYTHON_BACKTRACE_ID1 "\n\nTraceback (most recent call last):\n"
-#define PYTHON_BACKTRACE_ID2 "\n\nLocal variables in innermost frame:\n"
-
-int main(int argc, char **argv)
-{
-  /* Set options default values and parse program command line. */
-  struct arguments arguments;
-  arguments.independent = false;
-  arguments.frame_depth = -1;
-  arguments.single_thread = false;
-  arguments.remove_exit_handlers = false;
-  arguments.remove_noncrash_frames = false;
-  arguments.debug_parser = false;
-  arguments.debug_scanner = false;
-  arguments.verbose = false;
-  arguments.filename = 0;
-  argp_parse(&argp, argc, argv, 0, 0, &arguments);
-
-  char *bttext = NULL;
-
-  /* If a filename was provided, read input from file. 
-     Otherwise read from stdin. */
-  if (arguments.filename)
-  {
-    /* Open input file, and parse it. */
-    FILE *fp = fopen(arguments.filename, "r");
-    if (!fp)
-    {
-      fprintf(stderr, "Unable to open '%s'.\n", arguments.filename);
-      exit(EX_NOINPUT); /* No such file or directory */
-    }
-
-    /* Header and footer of the backtrace is stripped to simplify the parser. 
-     * A drawback is that the backtrace must be loaded to memory.
-     */
-    fseek(fp, 0, SEEK_END);
-    size_t size = ftell(fp);
-    fseek(fp, 0, SEEK_SET);
-
-    if (size > FILE_SIZE_LIMIT)
-    {
-      fprintf(stderr, "Input file too big (%zd). Maximum size is %d.\n", 
-              size, FILE_SIZE_LIMIT);
-      exit(EX_IOERR);
-    }
-
-    /* Handle the case that the input file is empty.
-     * The code is not designed to support completely empty backtrace.
-     * Silently exit indicating success.
-     */
-    if (size == 0)
-    {
-      fclose(fp);
-      exit(0);
-    }
-
-    bttext = malloc(size + 1);
-    if (!bttext)
-    {
-      fclose(fp);
-      fputs("malloc failed", stderr);
-      exit(EX_OSERR);
-    }
-
-    if (1 != fread(bttext, size, 1, fp))
-    {
-      fclose(fp);
-      fprintf(stderr, "Unable to read from '%s'.\n", arguments.filename);
-      exit(EX_IOERR); /* IO Error */
-    }
-  
-    bttext[size] = '\0';
-    fclose(fp);
-  }
-  else
-  {
-    struct strbuf *btin = strbuf_new();
-    int c;
-    while ((c = getchar()) != EOF && c != '\0')
-      strbuf_append_char(btin, (char)c);
-
-    strbuf_append_char(btin, '\0');
-    bttext = btin->buf;
-    strbuf_free_nobuf(btin); /* free btin, but not its internal buffer */
-  }
-
-  /* Detect Python backtraces. If it is a Python backtrace, 
-   * silently exit for now.
-   */
-  if (strstr(bttext, PYTHON_BACKTRACE_ID1) != NULL 
-      && strstr(bttext, PYTHON_BACKTRACE_ID2) != NULL)
-  {
-    exit(0);
-  }
-
-  /* Print independent backtrace and exit. */
-  if (arguments.independent)
-  {
-    struct strbuf *ibt = independent_backtrace(bttext);
-    puts(ibt->buf);
-    strbuf_free(ibt);
-    free(bttext);
-    return 0; /* OK */
-  }
-
-  /* Skip the backtrace header information. */
-  char *btnoheader_a = strstr(bttext, "\nThread ");
-  char *btnoheader_b = strstr(bttext, "\n#");
-  char *btnoheader = bttext;
-  if (btnoheader_a)
-  {
-    if (btnoheader_b && btnoheader_b < btnoheader_a)
-      btnoheader = btnoheader_b + 1;
-    else
-      btnoheader = btnoheader_a + 1;
-  }
-  else if (btnoheader_b)
-    btnoheader = btnoheader_b + 1;
-
-  /* Bug fixing hack for broken backtraces.
-   * Sometimes the empty line is missing before new Thread section.
-   * This is against rules, but a bug (now fixed) in Linux kernel caused
-   * this.
-   */
-  char *thread_fixer = btnoheader + 1;
-  while ((thread_fixer = strstr(thread_fixer, "\nThread")) != NULL)
-  {
-    if (thread_fixer[-1] != '\n')
-      thread_fixer[-1] = '\n';
-
-    ++thread_fixer;
-  }
-
-  /* Bug fixing hack for GDB - remove wrongly placed newlines from the backtrace.
-   * Sometimes there is a newline in the local variable section.
-   * This is caused by some GDB hooks.
-   * Example: rhbz#538440
-   * #1  0x0000000000420939 in sync_deletions (mse=0x0, mfld=0x1b85020)
-   *    at mail-stub-exchange.c:1119
-   *     status = <value optimized out>
-   *     iter = 0x1af38d0
-   *     known_messages = 0x1b5c460Traceback (most recent call last):
-   *  File "/usr/share/glib-2.0/gdb/glib.py", line 98, in next
-   *    if long (node["key_hash"]) >= 2:
-   * RuntimeError: Cannot access memory at address 0x11
-   *
-   *     __PRETTY_FUNCTION__ = "sync_deletions"
-   * #2  0x0000000000423e6b in refresh_folder (stub=0x1b77f10 [MailStubExchange], 
-   * ...
-   *
-   * The code removes every empty line (also those containing only spaces),
-   * which is not followed by a new Thread section.
-   * 
-   * rhbz#555251 contains empty lines with spaces
-   */
-  char *empty_line = btnoheader; 
-  char *c = btnoheader;
-  while (*c)
-  {
-    if (*c == '\n')
-    {
-      char *cend = c + 1;
-      while (*cend == ' ' || *cend == '\t')
-        ++cend;
-      if (*cend == '\n' && 0 != strncmp(cend, "\nThread", strlen("\nThread")))
-        memmove(c, cend, strlen(cend) + 1);
-    }
-    ++c;
-  }
-  while ((empty_line = strstr(empty_line, "\n\n")) != NULL)
-  {
-    if (0 != strncmp(empty_line, "\n\nThread", strlen("\n\nThread")))
-    {
-      /* Remove the empty line by converting the first newline to char. */
-      empty_line[0] = 'X'; 
-    }
-    ++empty_line;
-  }
-
-  /* Cut the backtrace footer.
-   * Footer: lines not starting with # or "Thread", and separated from
-   * the backtrace body by a newline. 
-   */
-  /* It is not necessary for now, because of the bug fixing hack for GDB.
-  int i;
-  for (i = size - 1; i > 0; --i)
-  {
-    if (bttext[i] != '\n')
-      continue;
-    if (strncmp(bttext + i + 1, "Thread", strlen("Thread")) == 0)
-      break;
-    if (bttext[i + 1] == '#')
-      break;
-    if (bttext[i - 1] == '\n')
-    {
-      bttext[i] = '\0';
-      break;
-    }
-    }*/
-  
-  /* Try to parse the backtrace. */
-  struct backtrace *backtrace;
-  backtrace = do_parse(btnoheader, arguments.debug_parser, arguments.debug_scanner);
-
-  /* If the parser failed print independent backtrace. */
-  if (!backtrace)
-  {
-    struct strbuf *ibt = independent_backtrace(bttext);
-    puts(ibt->buf);
-    strbuf_free(ibt);
-    free(bttext);
-    /* Parsing failed, but the output can be used. */
-    return EX_PARSINGFAILED; 
-  }
-
-  free(bttext);
-
-  /* If a single thread is requested, remove all other threads. */
-  int retval = 0;
-  struct thread *crash_thread = NULL;
-  if (arguments.single_thread)
-  {
-    crash_thread = backtrace_find_crash_thread(backtrace);
-    if (crash_thread)
-      backtrace_remove_threads_except_one(backtrace, crash_thread);
-    else
-    {
-      fprintf(stderr, "Detection of crash thread failed.\n");
-      /* THREAD DETECTION FAILED, BUT THE OUTPUT CAN BE USED */
-      retval = EX_THREADDETECTIONFAILED; 
-    }
-  }
-
-  if (arguments.remove_noncrash_frames)
-    backtrace_remove_noncrash_frames(backtrace);
-
-  /* If a frame removal is requested, do it now. */
-  if (arguments.frame_depth > 0)
-    backtrace_limit_frame_depth(backtrace, arguments.frame_depth);    
-
-  /* Frame removal can be done before removing exit handlers */
-  if (arguments.remove_exit_handlers > 0)
-    backtrace_remove_exit_handlers(backtrace);
-
-  backtrace_print_tree(backtrace, arguments.verbose);
-  backtrace_free(backtrace);
-  return retval;
-}
diff --git a/src/Backtrace/parser.y b/src/Backtrace/parser.y
deleted file mode 100644
index 42ac2206..00000000
--- a/src/Backtrace/parser.y
+++ /dev/null
@@ -1,610 +0,0 @@
-%{ /* -*- mode: yacc -*-
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "backtrace.h"
-#include "strbuf.h"
-
-struct backtrace *g_backtrace;
-
-#define YYDEBUG 1
-#define YYMAXDEPTH 10000000
-void yyerror(char const *s)
-{
-  fprintf (stderr, "\nParser error: %s\n", s);
-}
-
-int yylex();
-
-%}
-     
-/* This defines the type of yylval */
-%union {
-  struct backtrace *backtrace;
-  struct thread *thread;
-  struct frame *frame;
-  char *str;
-  int num;
-  char c;
-
-  struct strbuf *strbuf;
-}
-
-/* Bison declarations.  */
-%token END 0 "end of file"
-
-%type <backtrace> backtrace
-%type <thread> threads 
-               thread
-%type <frame>  frames 
-               frame 
-               frame_head 
-               frame_head_1 
-               frame_head_2 
-               frame_head_3 
-               frame_head_4 
-               frame_head_5
-%type <strbuf> identifier 
-               hexadecimal_digit_sequence 
-               hexadecimal_number 
-               file_name 
-               file_location 
-               function_call 
-               function_name 
-               digit_sequence 
-               frame_address_in_function
-               identifier_braces
-               identifier_braces_inside
-               identifier_template
-               identifier_template_inside
-%type <c>      nondigit 
-               digit 
-               hexadecimal_digit 
-               file_name_char 
-               identifier_char 
-               identifier_char_no_templates 
-               identifier_first_char
-               identifier_braces_inside_char
-               identifier_template_inside_char
-               variables_char
-               variables_char_no_framestart
-               ws
-               ws_nonl
-               '(' ')' '+' '-' '/' '.' '_' '~' '[' ']' '\r' '?' '{' '}'
-               'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j' 'k' 'l' 
-               'm' 'n' 'o' 'p' 'q' 'r' 's' 't' 'u' 'v' 'w' 'x' 'y' 'z' 
-               'A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J' 'K' 'L' 'M' 'N' 
-               'O' 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W' 'X' 'Y' 'Z' 
-               '0' '1' '2' '3' '4' '5' '6' '7' '8' '9'
-               '\'' '`' ',' '#' '@' '<' '>' '=' ':' '"' ';' ' ' 
-               '\n' '\t' '\\' '!' '*' '%' '|' '^' '&' '$'
-%type <num>    frame_start
-
-%destructor { thread_free($$); } <thread>
-%destructor { frame_free($$); } <frame>
-%destructor { strbuf_free($$); } <strbuf>
-
-%start backtrace
-%glr-parser
-%error-verbose
-%locations
-
-%% /* The grammar follows.  */
-
-backtrace : /* empty */ %dprec 1 
-             { $$ = g_backtrace = backtrace_new(); }
-          | threads wsa %dprec 2
-             { 
-               $$ = g_backtrace = backtrace_new(); 
-               $$->threads = $1; 
-             }
-          |  frame_head wss threads wsa %dprec 4
-             { 
-               $$ = g_backtrace = backtrace_new(); 
-               $$->threads = $3; 
-               $$->crash = $1;
-             }
-          | frame wss threads wsa %dprec 3
-             { 
-               $$ = g_backtrace = backtrace_new(); 
-               $$->threads = $3; 
-               $$->crash = $1;
-             }
-;
-
-threads   : thread
-          | threads '\n' thread { $$ = thread_add_sibling($1, $3); }
-;
-
-thread    : keyword_thread wss digit_sequence wsa '(' keyword_thread wss digit_sequence wsa ')' ':' wsa frames 
-              { 
-                $$ = thread_new(); 
-                $$->frames = $13; 
-		
-		if (sscanf($3->buf, "%d", &$$->number) != 1)
-		{
-		  printf("Error while parsing thread number '%s'", $3->buf);
-		  exit(5);
-		}
-		strbuf_free($3);
-		strbuf_free($8);
-              }
-;
-
-frames    : frame        { $$ = $1; }
-          | frames frame { $$ = frame_add_sibling($1, $2); }
-;
-
-frame : frame_head_1 wss variables %dprec 3
-      | frame_head_2 wss variables %dprec 4
-      | frame_head_3 wss variables %dprec 5 
-      | frame_head_4 wss variables %dprec 2 
-      | frame_head_5 wss variables %dprec 1
-;
-
-frame_head : frame_head_1 %dprec 3 
-	   | frame_head_2 %dprec 4 
-	   | frame_head_3 %dprec 5 
-           | frame_head_4 %dprec 2 
-           | frame_head_5 %dprec 1
-;
-
-frame_head_1 : frame_start wss function_call wsa keyword_at wss file_location
-             { 
-               $$ = frame_new(); 
-               $$->number = $1; 
-               $$->function = $3->buf; 
-               strbuf_free_nobuf($3); 
-	       $$->sourcefile = $7->buf;
-               strbuf_free_nobuf($7); 
-             }
-;
-
-frame_head_2 : frame_start wss frame_address_in_function wss keyword_at wss file_location
-             { 
-               $$ = frame_new(); 
-               $$->number = $1; 
-               $$->function = $3->buf; 
-               strbuf_free_nobuf($3); 
-	       $$->sourcefile = $7->buf;
-               strbuf_free_nobuf($7); 
-             }
-;
-
-frame_head_3 : frame_start wss frame_address_in_function wss keyword_from wss file_location
-             { 
-               $$ = frame_new(); 
-               $$->number = $1; 
-               $$->function = $3->buf; 
-               strbuf_free_nobuf($3); 
-	       $$->sourcefile = $7->buf;
-               strbuf_free_nobuf($7); 
-             }
-;
-
-frame_head_4 : frame_start wss frame_address_in_function
-             { 
-               $$ = frame_new(); 
-               $$->number = $1; 
-               $$->function = $3->buf; 
-               strbuf_free_nobuf($3); 
-             }
-;
-
-frame_head_5 : frame_start wss keyword_sighandler
-             { 
-               $$ = frame_new(); 
-               $$->number = $1; 
-	       $$->signal_handler_called = true;
-             }
-
-frame_start: '#' digit_sequence 
-                 { 
-                   if (sscanf($2->buf, "%d", &$$) != 1)
-		   {
-		     printf("Error while parsing frame number '%s'.\n", $2->buf);
-		     exit(5);
-		   }
-		   strbuf_free($2); 
-                 }
-;
-
-frame_address_in_function : hexadecimal_number wss keyword_in wss function_call 
-                              {
-                                strbuf_free($1); 
-                                $$ = $5; 
-                              }
-                          | hexadecimal_number wss keyword_in wss keyword_vtable wss keyword_for wss function_call
-                              {
-                                strbuf_free($1); 
-                                $$ = $9; 
-                              }
-;
-
-file_location : file_name ':' digit_sequence 
-                  {
-                    $$ = $1; 
-                    strbuf_free($3); /* line number not needed for now */
-                  }
-              | file_name
-;
-
-variables : variables_line '\n'
-          | variables_line END 
-          | variables_line wss_nonl '\n' 
-          | variables_line wss_nonl END  
-          | variables variables_line '\n' 
-          | variables variables_line END  
-          | variables variables_line wss_nonl '\n' 
-          | variables variables_line wss_nonl END  
-          | variables wss_nonl variables_line '\n'
-          | variables wss_nonl variables_line END  
-          | variables wss_nonl variables_line wss_nonl '\n' 
-          | variables wss_nonl variables_line wss_nonl END  
-;
-
-variables_line : variables_char_no_framestart
-               | variables_line variables_char
-               | variables_line wss_nonl variables_char
-;
-
-variables_char : '#' | variables_char_no_framestart
-;
-
-/* Manually synchronized with function_args_char_base, except the first line. */
-variables_char_no_framestart : digit | nondigit | '"' | '(' | ')' | '\\'
-                             | '+' | '-' | '<' | '>' | '/' | '.' 
-                             | '[' | ']' | '?' | '\'' | '`' | ',' 
-                             | '=' | '{' | '}' | '^' | '&' | '$'
-                             | ':' | ';' | '!' | '@' | '*' 
-                             | '%' | '|' | '~'
-;
-
-function_call : function_name wss function_args %dprec 3
-              | return_type wss_nonl function_name wss function_args %dprec 2
-                  { $$ = $3; }
-              | function_name wss_nonl identifier_template wss function_args %dprec 1
-	      { $$ = $1; strbuf_free($3); }
-;
-
-return_type : identifier { strbuf_free($1); }
-;
-
-function_name : identifier
-              | '?' '?' 
-                { 
-                  $$ = strbuf_new(); 
-                  strbuf_append_str($$, "??"); 
-                }
-;
-
-function_args : '(' wsa ')'
-              | '(' wsa function_args_sequence wsa ')'
-;
-
-function_args_sequence : function_args_char
-                       | function_args_sequence wsa '(' wsa ')'
-                       | function_args_sequence wsa '(' wsa function_args_string wsa ')'
-                       | function_args_sequence wsa '(' wsa function_args_sequence wsa ')'
-                       | function_args_sequence wsa function_args_char
-                       | function_args_sequence wsa function_args_string
-;
-
-function_args_string : '"' wsa function_args_string_sequence wsa '"'
-                     | '"' wsa '"'
-;
-
-/* Manually synchronized with variables_char_no_framestart,
- * except the first line. 
- */
-function_args_char_base : digit | nondigit | '#'
-                   | '+' | '-' | '<' | '>' | '/' | '.' 
-                   | '[' | ']' | '?' | '\'' | '`' | ',' 
-                   | '=' | '{' | '}' | '^' | '&' | '$'
-                   | ':' | ';' | '!' | '@' | '*' 
-                   | '%' | '|' | '~'
-;
-function_args_escaped_char : '\\' function_args_char_base
-                           | '\\' '\\'
-                           | '\\' '"'
-;
-function_args_char : function_args_char_base
-                   | function_args_escaped_char
-;
-
-
-function_args_string_sequence : function_args_string_char
-                    | function_args_string_sequence function_args_string_char
-                    | function_args_string_sequence wss_nonl function_args_string_char
-;
-
-function_args_string_char : function_args_char | '(' | ')'
-;
-
-file_name : file_name_char { $$ = strbuf_new(); strbuf_append_char($$, $1); }
-          | file_name file_name_char { $$ = strbuf_append_char($1, $2); }
-;
-
-file_name_char : digit | nondigit | '-' | '+' | '/' | '.'
-;
-
- /* Function name, sometimes mangled.  
-  * Example: something@GLIB_2_2
-  * CClass::operator=
-  */
-identifier : identifier_first_char %dprec 1
-              {
-		$$ = strbuf_new(); 
-		strbuf_append_char($$, $1); 
-	      }
-           | identifier_braces %dprec 1 /* e.g. (anonymous namespace)::WorkerThread */
-           | identifier identifier_char %dprec 1
-	      { $$ = strbuf_append_char($1, $2); }
-           | identifier identifier_braces %dprec 1
-              { 
-		$$ = strbuf_append_str($1, $2->buf); 
-		strbuf_free($2);
-	      }
-           | identifier identifier_template %dprec 2
-              { 
-		$$ = strbuf_append_str($1, $2->buf); 
-		strbuf_free($2);
-	      }
-;
-
-identifier_first_char: nondigit 
-                     | '~' /* destructor */
-                     | '*'
-;
-
-identifier_char_no_templates : digit | nondigit | '@' | '.' | ':' | '=' 
-	                     | '!' | '*' | '+' | '-' | '[' | ']'
-                             | '~' | '&' | '/' | '%' | '^'
-                             | '|' | ','
-;
-
-/* Most of the special characters are required to support C++ 
- * operator overloading.
- */
-identifier_char : identifier_char_no_templates | '<'| '>'
-;
-
-identifier_braces : '(' ')'
-                      {
-			$$ = strbuf_new();
-			strbuf_append_char($$, $1);
-			strbuf_append_char($$, $2);
-		      }
-                  | '(' identifier_braces_inside ')' 
-                      {
-			$$ = strbuf_new();
-			strbuf_append_char($$, $1);
-			strbuf_append_str($$, $2->buf);
-			strbuf_free($2);
-			strbuf_append_char($$, $3);
-                      }
-;
-
-identifier_braces_inside : identifier_braces_inside_char %dprec 1
-                            {
-	                      $$ = strbuf_new(); 
-		              strbuf_append_char($$, $1); 
-	                    }                         
-                         | identifier_braces_inside identifier_braces_inside_char %dprec 1
-			    { $$ = strbuf_append_char($1, $2); }
-                         | identifier_braces_inside '(' identifier_braces_inside ')' %dprec 1
-			    { 
-			      $$ = strbuf_append_char($1, $2); 
-			      $$ = strbuf_append_str($1, $3->buf); 
-			      strbuf_free($3);
-			      $$ = strbuf_append_char($1, $4); 
-			    }
-                         | identifier_braces_inside '(' ')' %dprec 1
-			    { 
-			      $$ = strbuf_append_char($1, $2); 
-			      $$ = strbuf_append_char($1, $3); 
-			    }
-                         | identifier_braces_inside identifier_template %dprec 2
-			    {
-			      $$ = strbuf_append_str($1, $2->buf); 
-			      strbuf_free($2);
-			    }	
-;
-
-identifier_braces_inside_char : identifier_char | ws_nonl
-;
-
-identifier_template : '<' identifier_template_inside '>'
-                      {
-			$$ = strbuf_new();
-			strbuf_append_char($$, $1);
-			strbuf_append_str($$, $2->buf);
-			strbuf_free($2);
-			strbuf_append_char($$, $3);
-		      }
-;
-
-identifier_template_inside : identifier_template_inside_char
-                              {
-	                        $$ = strbuf_new(); 
-		                strbuf_append_char($$, $1); 
-	                      }           
-                           | identifier_template_inside identifier_template_inside_char
-			      { $$ = strbuf_append_char($1, $2); }
-                           | identifier_template_inside '<' identifier_template_inside '>'
-			      { 
-				$$ = strbuf_append_char($1, $2); 
-				$$ = strbuf_append_str($1, $3->buf); 
-				strbuf_free($3);
-				$$ = strbuf_append_char($1, $4); 
-			      }
-                           | identifier_template_inside identifier_braces
-			      {
-				$$ = strbuf_append_str($1, $2->buf); 
-				strbuf_free($2);
-			      }			
-;
-
-identifier_template_inside_char : identifier_char_no_templates | ws_nonl
-;
-
-digit_sequence : digit { $$ = strbuf_new(); strbuf_append_char($$, $1); }
-               | digit_sequence digit { $$ = strbuf_append_char($1, $2); }
-;
-
-hexadecimal_number : '0' 'x' hexadecimal_digit_sequence 
-                     { 
-                       $$ = $3;
-                       strbuf_prepend_str($$, "0x"); 
-                     }
-                   | '0' 'X' hexadecimal_digit_sequence 
-                     { 
-                       $$ = $3;
-                       strbuf_prepend_str($$, "0X"); 
-                     }
-;
-
-hexadecimal_digit_sequence : hexadecimal_digit 
-                               { 
-                                 $$ = strbuf_new(); 
-                                 strbuf_append_char($$, $1); 
-                               }
-                           | hexadecimal_digit_sequence hexadecimal_digit 
-                               { $$ = strbuf_append_char($1, $2); }
-;
-
-hexadecimal_digit : digit
-                  | 'a' | 'b' | 'c' | 'd' | 'e' | 'f'
-                  | 'A' | 'B' | 'C' | 'D' | 'E' | 'F'
-;
-
-digit : '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
-;
-
-nondigit : 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' | 'j' | 'k'
-         | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r' | 's' | 't' | 'u' | 'v' | 'w'
-         | 'x' | 'y' | 'z' 
-         | 'A' | 'B' | 'C' | 'D' | 'E' | 'F' | 'G' | 'H' | 'I' | 'J' | 'K'
-         | 'L' | 'M' | 'N' | 'O' | 'P' | 'Q' | 'R' | 'S' | 'T' | 'U' | 'V' | 'W'
-         | 'X' | 'Y' | 'Z'
-         | '_'
-;
-
- /* whitespace */
-ws : ws_nonl | '\n' | '\r'
-;
-
- /* No newline.*/
-ws_nonl : '\t' | ' '
-;
-
- /* whitespace sequence without a newline */
-wss_nonl : ws_nonl
-         | wss_nonl ws_nonl
-;
-
- /* whitespace sequence */
-wss : ws
-    | wss ws
-;
- 
- /* whitespace sequence allowed */
-wsa : 
-    | wss
-;
-
-keyword_in : 'i' 'n'
-;
-
-keyword_at : 'a' 't'
-;
-
-keyword_for : 'f' 'o' 'r'
-;
-
-keyword_vtable : 'v' 't' 'a' 'b' 'l' 'e'
-;
-
-keyword_from : 'f' 'r' 'o' 'm'
-;
-
-keyword_thread: 'T' 'h' 'r' 'e' 'a' 'd'
-;
-
-keyword_sighandler: '<' 's' 'i' 'g' 'n' 'a' 'l' ' ' 'h' 'a' 'n' 'd' 'l' 'e' 'r' ' ' 'c' 'a' 'l' 'l' 'e' 'd' '>'
-;
-
-%%
-
-static bool scanner_echo = false;
-static char *yyin;
-
-int yylex()
-{
-  char c = *yyin;
-  if (c == '\0')
-    return END;
-  ++yyin;
-
-  /* Debug output. */
-  if (scanner_echo)
-    putchar(c);
-
-  yylval.c = c;
-
-  /* Return a single char. */
-  return c;
-}
-
-/* This is the function that is actually called from outside. 
- * @returns
- *   Backtrace structure. Caller is responsible for calling
- *   backtrace_free() on this.
- *   Returns NULL when parsing failed.
- */
-struct backtrace *do_parse(char *input, bool debug_parser, bool debug_scanner)
-{
-  /* Prepare for running parser. */
-  g_backtrace = 0;
-  yyin = input;
-#if YYDEBUG == 1
-  if (debug_parser)
-    yydebug = 1;
-#endif
-  scanner_echo = debug_scanner;
-
-  /* Parse. */
-  int failure = yyparse();
-  
-  /* Separate debugging output. */
-  if (scanner_echo)
-    putchar('\n'); 
-
-  if (failure)
-  {
-    if (g_backtrace)
-    {
-      backtrace_free(g_backtrace);
-      g_backtrace = NULL;
-    }
-    fprintf(stderr, "Error while parsing backtrace.\n");
-  }
-
-  return g_backtrace;
-}
diff --git a/src/Backtrace/strbuf.c b/src/Backtrace/strbuf.c
deleted file mode 100644
index 4c6d886b..00000000
--- a/src/Backtrace/strbuf.c
+++ /dev/null
@@ -1,112 +0,0 @@
-/*
-    strbuf.c - string buffer implementation
-
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#include "strbuf.h"
-#include <stdlib.h>
-#include <stdio.h>
-#include <assert.h>
-#include <string.h>
-
-struct strbuf *strbuf_new()
-{
-  struct strbuf *buf = malloc(sizeof(struct strbuf));
-  if (!buf)
-  {
-    puts("Error while allocating memory for string buffer.");
-    exit(5);
-  }
-
-  buf->alloc = 8;
-  buf->len = 0;
-  buf->buf = malloc(buf->alloc);
-  if (!buf->buf)
-  {
-    puts("Error while allocating memory for string buffer.");
-    exit(5);
-  }
-  
-  buf->buf[buf->len] = '\0';
-  return buf;
-}
-
-void strbuf_free(struct strbuf *strbuf)
-{
-  free(strbuf->buf);
-  free(strbuf);
-}
-
-void strbuf_free_nobuf(struct strbuf *strbuf)
-{
-  free(strbuf);
-}
-
-
-void strbuf_clear(struct strbuf *strbuf)
-{
-  assert(strbuf->alloc > 0);
-  strbuf->len = 0;
-  strbuf->buf[0] = '\0';
-}
-
-/* Ensures that the buffer can be extended by num characters
- * without touching malloc/realloc.
- */
-static void strbuf_grow(struct strbuf *strbuf, int num)
-{
-  if (strbuf->len + num + 1 > strbuf->alloc)
-  {
-    while (strbuf->len + num + 1 > strbuf->alloc)
-      strbuf->alloc *= 2; /* huge grow = infinite loop */
-
-    strbuf->buf = realloc(strbuf->buf, strbuf->alloc);
-    if (!strbuf->buf)
-    {
-      puts("Error while allocating memory for string buffer.");
-      exit(5);
-    }
-  }
-}
-
-struct strbuf *strbuf_append_char(struct strbuf *strbuf, char c)
-{
-  strbuf_grow(strbuf, 1);
-  strbuf->buf[strbuf->len++] = c;
-  strbuf->buf[strbuf->len] = '\0';
-  return strbuf;
-}
-
-struct strbuf *strbuf_append_str(struct strbuf *strbuf, char *str)
-{
-  int len = strlen(str);
-  strbuf_grow(strbuf, len);
-  assert(strbuf->len + len < strbuf->alloc);
-  strcpy(strbuf->buf + strbuf->len, str);
-  strbuf->len += len;
-  return strbuf;
-}
-
-struct strbuf *strbuf_prepend_str(struct strbuf *strbuf, char *str)
-{
-  int len = strlen(str);
-  strbuf_grow(strbuf, len);
-  assert(strbuf->len + len < strbuf->alloc);
-  memmove(strbuf->buf + len, strbuf->buf, strbuf->len + 1);
-  memcpy(strbuf->buf, str, len);
-  return strbuf;
-}
diff --git a/src/Backtrace/strbuf.h b/src/Backtrace/strbuf.h
deleted file mode 100644
index f2e4459e..00000000
--- a/src/Backtrace/strbuf.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-    strbuf.h - string buffer
-
-    Copyright (C) 2009  RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-#ifndef STRBUF_H
-#define STRBUF_H
-
-struct strbuf {
-  int alloc;
-  int len;
-  char *buf;
-};
-
-extern struct strbuf *strbuf_new();
-extern void strbuf_free(struct strbuf *strbuf);
-/* Releases strbuf, but not the internal buffer. */
-extern void strbuf_free_nobuf(struct strbuf *strbuf);
-extern void strbuf_clear(struct strbuf *strbuf);
-extern struct strbuf *strbuf_append_char(struct strbuf *strbuf, char c);
-extern struct strbuf *strbuf_append_str(struct strbuf *strbuf, char *str);
-extern struct strbuf *strbuf_prepend_str(struct strbuf *strbuf, char *str);
-
-#endif
diff --git a/src/Makefile.am b/src/Makefile.am
index dbd7ebbc..42266b31 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1 +1 @@
-SUBDIRS = Hooks Daemon Applet Gui CLI Backtrace
+SUBDIRS = Hooks Daemon Applet Gui CLI utils
diff --git a/src/utils/Makefile.am b/src/utils/Makefile.am
new file mode 100644
index 00000000..0cecf26a
--- /dev/null
+++ b/src/utils/Makefile.am
@@ -0,0 +1,11 @@
+bin_PROGRAMS = abrt-backtrace
+abrt_backtrace_CFLAGS = -Wall
+abrt_backtrace_SOURCES = abrt-backtrace.c
+abrt_backtrace_CPPFLAGS = \
+    -I$(srcdir)/../../inc \
+    -I$(srcdir)/../../lib/Utils
+abrt_backtrace_LDADD = \
+    ../../lib/Utils/libABRTUtils.la
+
+man_MANS = abrt-backtrace.1
+EXTRA_DIST = $(man_MANS)
diff --git a/src/Backtrace/abrt-backtrace.1 b/src/utils/abrt-backtrace.1
index ff7c2be2..ff7c2be2 100644
--- a/src/Backtrace/abrt-backtrace.1
+++ b/src/utils/abrt-backtrace.1
diff --git a/src/utils/abrt-backtrace.c b/src/utils/abrt-backtrace.c
new file mode 100644
index 00000000..f5f8e64d
--- /dev/null
+++ b/src/utils/abrt-backtrace.c
@@ -0,0 +1,318 @@
+/* -*-mode:c++;c-file-style:"bsd";c-basic-offset:4;indent-tabs-mode:nil-*-
+    main.cpp - parses command line arguments
+
+    Copyright (C) 2009  RedHat inc.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#include <argp.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <string.h>
+#include "config.h"
+#include "backtrace.h"
+#include "strbuf.h"
+
+/* Too large files are trimmed. */
+#define FILE_SIZE_LIMIT 20000000 /* ~ 20 MB */
+
+#define EX_PARSINGFAILED EX__MAX + 1  /* = 79 */
+#define EX_THREADDETECTIONFAILED EX__MAX + 2 /* = 80 */
+
+const char *argp_program_version = "abrt-backtrace " VERSION;
+const char *argp_program_bug_address = "<crash-catcher@lists.fedorahosted.org>";
+
+static char doc[] = "abrt-backtrace -- backtrace analyzer";
+
+/* A description of the arguments we accept. */
+static char args_doc[] = "FILE";
+
+static struct argp_option options[] = {
+    {"independent"           , 'i', 0  , 0, "Prints independent backtrace (fallback)"},
+    {"single-thread"         , 'n', 0  , 0, "Display the crash thread only in the backtrace"},
+    {"frame-depth"           , 'd', "N", 0, "Display only top N frames under the crash frame"},
+    {"remove-exit-handlers"  , 'r', 0  , 0, "Removes exit handler frames from the displayed backtrace"},
+    {"remove-noncrash-frames", 'm', 0  , 0, "Removes common frames known as not causing crash"},
+    {"rate"                  , 'a', 0  , 0, "Prints the backtrace rating from 0 to 4"},
+    {"debug-parser"          , 'p', 0  , 0, "Prints parser debug information"},
+    {"debug-scanner"         , 's', 0  , 0, "Prints scanner debug information"},
+    {"verbose"               , 'v', 0  , 0, "Print human-friendly superfluous output."},
+  { 0 }
+};
+
+struct arguments
+{
+    bool independent;
+    bool single_thread;
+    int frame_depth; /* negative == do not limit the depth */
+    bool remove_exit_handlers;
+    bool remove_noncrash_frames;
+    bool debug_parser;
+    bool debug_scanner;
+    bool verbose;
+    bool rate;
+    char *filename;
+};
+
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+    /* Get the input argument from argp_parse, which we
+       know is a pointer to our arguments structure. */
+    struct arguments *arguments = (struct arguments*)state->input;
+
+    switch (key)
+    {
+    case 'i': arguments->independent = true; break;
+    case 'n': arguments->single_thread = true; break;
+    case 'd':
+        if (1 != sscanf(arg, "%d", &arguments->frame_depth))
+        {
+            /* Must be a number. */
+            argp_usage(state);
+            exit(EX_USAGE); /* Invalid argument */
+        }
+        break;
+    case 'r': arguments->remove_exit_handlers = true; break;
+    case 'm': arguments->remove_noncrash_frames = true; break;
+    case 'p': arguments->debug_parser = true; break;
+    case 's': arguments->debug_scanner = true; break;
+    case 'v': arguments->verbose = true; break;
+    case 'a': arguments->rate = true; break;
+
+    case ARGP_KEY_ARG:
+        if (arguments->filename)
+        {
+            /* Too many arguments. */
+            argp_usage(state);
+            exit(EX_USAGE); /* Invalid argument */
+        }
+        arguments->filename = arg;
+        break;
+
+    case ARGP_KEY_END:
+        break;
+
+    default:
+        return ARGP_ERR_UNKNOWN;
+    }
+    return 0;
+}
+
+/* Our argp parser. */
+static struct argp argp = { options, parse_opt, args_doc, doc };
+
+#define PYTHON_BACKTRACE_ID1 "\n\nTraceback (most recent call last):\n"
+#define PYTHON_BACKTRACE_ID2 "\n\nLocal variables in innermost frame:\n"
+
+int main(int argc, char **argv)
+{
+    /* Set options default values and parse program command line. */
+    struct arguments arguments;
+    arguments.independent = false;
+    arguments.frame_depth = -1;
+    arguments.single_thread = false;
+    arguments.remove_exit_handlers = false;
+    arguments.remove_noncrash_frames = false;
+    arguments.debug_parser = false;
+    arguments.debug_scanner = false;
+    arguments.verbose = false;
+    arguments.filename = 0;
+    arguments.rate = false;
+    argp_parse(&argp, argc, argv, 0, 0, &arguments);
+
+    /* If we are about to rate a backtrace, the other values must be set accordingly,
+       no matter what the user set on the command line. */
+    if (arguments.rate)
+    {
+        arguments.independent = false;
+        arguments.frame_depth = 5;
+        arguments.single_thread = true;
+        arguments.remove_exit_handlers = true;
+        arguments.remove_noncrash_frames = true;
+    }
+
+    char *bttext = NULL;
+
+    /* If a filename was provided, read input from file.
+       Otherwise read from stdin. */
+    if (arguments.filename)
+    {
+        /* Open input file, and parse it. */
+        FILE *fp = fopen(arguments.filename, "r");
+        if (!fp)
+        {
+            fprintf(stderr, "Unable to open '%s'.\n", arguments.filename);
+            exit(EX_NOINPUT); /* No such file or directory */
+        }
+
+        /* Header and footer of the backtrace is stripped to simplify the parser.
+         * A drawback is that the backtrace must be loaded to memory.
+         */
+        fseek(fp, 0, SEEK_END);
+        size_t size = ftell(fp);
+        fseek(fp, 0, SEEK_SET);
+
+        if (size > FILE_SIZE_LIMIT)
+        {
+            fprintf(stderr, "Input file too big (%zd). Maximum size is %d.\n",
+                    size, FILE_SIZE_LIMIT);
+            exit(EX_IOERR);
+        }
+
+        /* Handle the case that the input file is empty.
+         * The code is not designed to support completely empty backtrace.
+         * Silently exit indicating success.
+         */
+        if (size == 0)
+        {
+            fclose(fp);
+            exit(0);
+        }
+
+        bttext = malloc(size + 1);
+        if (!bttext)
+        {
+            fclose(fp);
+            fputs("malloc failed", stderr);
+            exit(EX_OSERR);
+        }
+
+        if (1 != fread(bttext, size, 1, fp))
+        {
+            fclose(fp);
+            fprintf(stderr, "Unable to read from '%s'.\n", arguments.filename);
+            exit(EX_IOERR); /* IO Error */
+        }
+
+        bttext[size] = '\0';
+        fclose(fp);
+    }
+    else
+    {
+        struct strbuf *btin = strbuf_new();
+        int c;
+        while ((c = getchar()) != EOF && c != '\0')
+            strbuf_append_char(btin, (char)c);
+
+        strbuf_append_char(btin, '\0');
+        bttext = btin->buf;
+        strbuf_free_nobuf(btin); /* free btin, but not its internal buffer */
+    }
+
+    /* Detect Python backtraces. If it is a Python backtrace,
+     * silently exit for now.
+     */
+    if (strstr(bttext, PYTHON_BACKTRACE_ID1) != NULL
+        && strstr(bttext, PYTHON_BACKTRACE_ID2) != NULL)
+    {
+        if (arguments.rate)
+            puts("4");
+        exit(0);
+    }
+
+    /* Print independent backtrace and exit. */
+    if (arguments.independent)
+    {
+        struct strbuf *ibt = independent_backtrace(bttext);
+        puts(ibt->buf);
+        strbuf_free(ibt);
+        free(bttext);
+        return 0; /* OK */
+    }
+
+    /* Try to parse the backtrace. */
+    struct backtrace *backtrace;
+    backtrace = backtrace_parse(bttext, arguments.debug_parser, arguments.debug_scanner);
+
+    /* If the parser failed print independent backtrace. */
+    if (!backtrace)
+    {
+        if (arguments.rate)
+        {
+            free(bttext);
+            puts("0");
+            /* Parsing failed, but the output can be used. */
+            return EX_PARSINGFAILED;
+        }
+        struct strbuf *ibt = independent_backtrace(bttext);
+        puts(ibt->buf);
+        strbuf_free(ibt);
+        free(bttext);
+        /* Parsing failed, but the output can be used. */
+        return EX_PARSINGFAILED;
+    }
+
+    free(bttext);
+
+    /* [--rate] Get the quality of the full backtrace. */
+    float q1 = backtrace_quality(backtrace);
+
+    /* If a single thread is requested, remove all other threads. */
+    int retval = 0;
+    struct thread *crash_thread = NULL;
+    if (arguments.single_thread)
+    {
+        crash_thread = backtrace_find_crash_thread(backtrace);
+        if (crash_thread)
+            backtrace_remove_threads_except_one(backtrace, crash_thread);
+        else
+        {
+            fprintf(stderr, "Detection of crash thread failed.\n");
+            /* THREAD DETECTION FAILED, BUT THE OUTPUT CAN BE USED */
+            retval = EX_THREADDETECTIONFAILED;
+        }
+    }
+    
+    /* [--rate] Get the quality of the crash thread. */
+    float q2 = backtrace_quality(backtrace);
+
+    if (arguments.remove_noncrash_frames)
+        backtrace_remove_noncrash_frames(backtrace);
+
+    /* If a frame removal is requested, do it now. */
+    if (arguments.frame_depth > 0)
+        backtrace_limit_frame_depth(backtrace, arguments.frame_depth);
+
+    /* Frame removal can be done before removing exit handlers */
+    if (arguments.remove_exit_handlers > 0)
+        backtrace_remove_exit_handlers(backtrace);
+
+    /* [--rate] Get the quality of frames around the crash. */
+    float q3 = backtrace_quality(backtrace);
+
+    if (arguments.rate)
+    {
+        /* Compute and store backtrace rating. */
+        /* Compute and store backtrace rating. The crash frame
+           is more important that the others. The frames around 
+           the crash are more important than the rest.  */
+        float qtot = 0.25f * q1 + 0.35f * q2 + 0.4f * q3;
+
+        /* Turn the quality to rating. */
+        const char *rating;
+        if (qtot < 0.6f)      rating = "0";
+        else if (qtot < 0.7f) rating = "1";
+        else if (qtot < 0.8f) rating = "2";
+        else if (qtot < 0.9f) rating = "3";
+        else                  rating = "4";
+        puts(rating);
+    }
+    else
+        backtrace_print_tree(backtrace, arguments.verbose);
+
+    backtrace_free(backtrace);
+    return retval;
+}