hphp/tools/gdb/nameof.py

   1 """
   2 GDB command for printing the names of various objects.
   3 """
   4
   5 from compatibility import *
   6
   7 import gdb
   8 from gdbutils import *
   9
  10
  11 #------------------------------------------------------------------------------
  12 # Name accessor.
  13
  14 def nameof(val):
  15     val = deref(val)
  16     t = val.type.name
  17
  18     sd = None
  19
  20     if t == 'HPHP::Func':
  21         sd = val['m_fullName']
  22     elif t == 'HPHP::Class':
  23         sd = deref(val['m_preClass'])['m_name']
  24     elif t == 'HPHP::ObjectData':
  25         cls = deref(val['m_cls'])
  26         sd = deref(cls['m_preClass'])['m_name']
  27
  28     if sd is None:
  29         return None
  30
  31     return string_data_val(deref(sd))
  32
  33
  34 #------------------------------------------------------------------------------
  35 # `nameof' command.
  36
  37 class NameOfCommand(gdb.Command):
  38     """Print the name of an HHVM object."""
  39
  40     def __init__(self):
  41         super(NameOfCommand, self).__init__('nameof', gdb.COMMAND_DATA)
  42
  43     @errorwrap
  44     def invoke(self, args, from_tty):
  45         try:
  46             obj = gdb.parse_and_eval(args)
  47         except gdb.error:
  48             print('Usage: nameof <object>')
  49             return
  50
  51         name = nameof(obj)
  52
  53         if name is not None:
  54             print('"' + name + '"')
  55
  56 NameOfCommand()