libstdc++-v3/python/hook.in

   1 # -*- python -*-
   2 # Copyright (C) 2009-2014 Free Software Foundation, Inc.
   3
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 import sys
  18 import gdb
  19 import os
  20 import os.path
  21
  22 pythondir = '@pythondir@'
  23 libdir = '@toolexeclibdir@'
  24
  25 # This file might be loaded when there is no current objfile.  This
  26 # can happen if the user loads it manually.  In this case we don't
  27 # update sys.path; instead we just hope the user managed to do that
  28 # beforehand.
  29 if gdb.current_objfile () is not None:
  30     # Update module path.  We want to find the relative path from libdir
  31     # to pythondir, and then we want to apply that relative path to the
  32     # directory holding the objfile with which this file is associated.
  33     # This preserves relocatability of the gcc tree.
  34
  35     # Do a simple normalization that removes duplicate separators.
  36     pythondir = os.path.normpath (pythondir)
  37     libdir = os.path.normpath (libdir)
  38
  39     prefix = os.path.commonprefix ([libdir, pythondir])
  40     # In some bizarre configuration we might have found a match in the
  41     # middle of a directory name.
  42     if prefix[-1] != '/':
  43         prefix = os.path.dirname (prefix) + '/'
  44
  45     # Strip off the prefix.
  46     pythondir = pythondir[len (prefix):]
  47     libdir = libdir[len (prefix):]
  48
  49     # Compute the ".."s needed to get from libdir to the prefix.
  50     dotdots = ('..' + os.sep) * len (libdir.split (os.sep))
  51
  52     objfile = gdb.current_objfile ().filename
  53     dir_ = os.path.join (os.path.dirname (objfile), dotdots, pythondir)
  54
  55     if not dir_ in sys.path:
  56         sys.path.insert(0, dir_)
  57
  58 # Load the pretty-printers.
  59 from libstdcxx.v6.printers import register_libstdcxx_printers
  60 register_libstdcxx_printers (gdb.current_objfile ())
  61
  62 # Load the xmethods if GDB supports them.
  63 def gdb_has_xmethods():
  64     try:
  65         import gdb.xmethod
  66         return True
  67     except ImportError:
  68         return False
  69
  70 if gdb_has_xmethods():
  71     from libstdcxx.v6.xmethods import register_libstdcxx_xmethods
  72     register_libstdcxx_xmethods (gdb.current_objfile ())