scripts/tracetool/format/stap.py

   1 # -*- coding: utf-8 -*-
   2
   3 """
   4 Generate .stp file (DTrace with SystemTAP only).
   5 """
   6
   7 __author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
   8 __copyright__  = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
   9 __license__    = "GPL version 2 or (at your option) any later version"
  10
  11 __maintainer__ = "Stefan Hajnoczi"
  12 __email__      = "stefanha@redhat.com"
  13
  14
  15 from tracetool import out
  16 from tracetool.backend.dtrace import binary, probeprefix
  17
  18
  19 # Technically 'self' is not used by systemtap yet, but
  20 # they recommended we keep it in the reserved list anyway
  21 RESERVED_WORDS = (
  22     'break', 'catch', 'continue', 'delete', 'else', 'for',
  23     'foreach', 'function', 'global', 'if', 'in', 'limit',
  24     'long', 'next', 'probe', 'return', 'self', 'string',
  25     'try', 'while'
  26     )
  27
  28
  29 def stap_escape(identifier):
  30     # Append underscore to reserved keywords
  31     if identifier in RESERVED_WORDS:
  32         return identifier + '_'
  33     return identifier
  34
  35
  36 def generate(events, backend, group):
  37     events = [e for e in events
  38               if "disable" not in e.properties]
  39
  40     out('/* This file is autogenerated by tracetool, do not edit. */',
  41         '')
  42
  43     for e in events:
  44         # Define prototype for probe arguments
  45         out('probe %(probeprefix)s.%(name)s = process("%(binary)s").mark("%(name)s")',
  46             '{',
  47             probeprefix=probeprefix(),
  48             name=e.name,
  49             binary=binary())
  50
  51         i = 1
  52         if len(e.args) > 0:
  53             for name in e.args.names():
  54                 name = stap_escape(name)
  55                 out('  %s = $arg%d;' % (name, i))
  56                 i += 1
  57
  58         out('}')
  59
  60     out()