offsets.py

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# noqa: ATL902
# origin: https://github.com/PhilArmstrong/pahole-gdb
# Original licenced under GPLv3.
#
# File: GdbUtils/python/offsets.py
# Purpose: Dump the offsets of fields in a structure.
#
 
import gdb
 
class Offsets(gdb.Command):
    """Dump offsets of members in a structure type."""
 
    def __init__(self):
        super (Offsets, self).__init__ ('offsets-of', gdb.COMMAND_DATA, gdb.COMPLETE_SYMBOL)
 
    def invoke(self, arg, from_tty):
        argv = gdb.string_to_argv(arg)
        if len(argv) != 1:
            raise gdb.GdbError('offsets-of takes exactly 1 argument.')
 
        stype = gdb.lookup_type(argv[0])
 
        print (argv[0], '{')
        for field in stype.fields():
            print ('    %s => %d' % (field.name, field.bitpos//8))
        print ('}')
 
Offsets()