1# -*- coding: utf-8 -*- 2 3""" 4Generic management for the 'vcpu' property. 5 6""" 7 8__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>" 9__copyright__ = "Copyright 2016, Lluís Vilanova <vilanova@ac.upc.edu>" 10__license__ = "GPL version 2 or (at your option) any later version" 11 12__maintainer__ = "Stefan Hajnoczi" 13__email__ = "stefanha@redhat.com" 14 15 16from tracetool import Arguments, try_import 17 18 19def transform_event(event): 20 """Transform event to comply with the 'vcpu' property (if present).""" 21 if "vcpu" in event.properties: 22 # events with 'tcg-trans' and 'tcg-exec' are auto-generated from 23 # already-patched events 24 assert "tcg-trans" not in event.properties 25 assert "tcg-exec" not in event.properties 26 27 event.args = Arguments([("CPUState *", "__cpu"), event.args]) 28 if "tcg" in event.properties: 29 fmt = "\"cpu=%p \"" 30 event.fmt = [fmt + event.fmt[0], 31 fmt + event.fmt[1]] 32 else: 33 fmt = "\"cpu=%p \"" 34 event.fmt = fmt + event.fmt 35 return event 36 37 38def transform_args(format, event, *args, **kwargs): 39 """Transforms the arguments to suit the specified format. 40 41 The format module must implement function 'vcpu_args', which receives the 42 implicit arguments added by the 'vcpu' property, and must return suitable 43 arguments for the given format. 44 45 The function is only called for events with the 'vcpu' property. 46 47 Parameters 48 ========== 49 format : str 50 Format module name. 51 event : Event 52 args, kwargs 53 Passed to 'vcpu_transform_args'. 54 55 Returns 56 ======= 57 Arguments 58 The transformed arguments, including the non-implicit ones. 59 60 """ 61 if "vcpu" in event.properties: 62 ok, func = try_import("tracetool.format." + format, 63 "vcpu_transform_args") 64 assert ok 65 assert func 66 return Arguments([func(event.args[:1], *args, **kwargs), 67 event.args[1:]]) 68 else: 69 return event.args 70