Merge remote-tracking branch 'remotes/elmarco/tags/slirp-pull-request' into staging
[qemu.git] / scripts / tracetool / format / simpletrace_stap.py
1 # -*- coding: utf-8 -*-
2
3 """
4 Generate .stp file that outputs simpletrace binary traces (DTrace with SystemTAP only).
5 """
6
7 __author__ = "Stefan Hajnoczi <redhat.com>"
8 __copyright__ = "Copyright (C) 2014, Red Hat, Inc."
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 probeprefix
17 from tracetool.backend.simple import is_string
18 from tracetool.format.stap import stap_escape
19
20 def global_var_name(name):
21 return probeprefix().replace(".", "_") + "_" + name
22
23 def generate(events, backend, group):
24 out('/* This file is autogenerated by tracetool, do not edit. */',
25 '')
26
27 for event_id, e in enumerate(events):
28 if 'disable' in e.properties:
29 continue
30
31 out('probe %(probeprefix)s.simpletrace.%(name)s = %(probeprefix)s.%(name)s ?',
32 '{',
33 probeprefix=probeprefix(),
34 name=e.name)
35
36 # Calculate record size
37 sizes = ['24'] # sizeof(TraceRecord)
38 for type_, name in e.args:
39 name = stap_escape(name)
40 if is_string(type_):
41 out(' try {',
42 ' arg%(name)s_str = %(name)s ? user_string_n(%(name)s, 512) : "<null>"',
43 ' } catch {}',
44 ' arg%(name)s_len = strlen(arg%(name)s_str)',
45 name=name)
46 sizes.append('4 + arg%s_len' % name)
47 else:
48 sizes.append('8')
49 sizestr = ' + '.join(sizes)
50
51 # Generate format string and value pairs for record header and arguments
52 fields = [('8b', str(event_id)),
53 ('8b', 'gettimeofday_ns()'),
54 ('4b', sizestr),
55 ('4b', 'pid()')]
56 for type_, name in e.args:
57 name = stap_escape(name)
58 if is_string(type_):
59 fields.extend([('4b', 'arg%s_len' % name),
60 ('.*s', 'arg%s_len, arg%s_str' % (name, name))])
61 else:
62 fields.append(('8b', name))
63
64 # Emit the entire record in a single SystemTap printf()
65 fmt_str = '%'.join(fmt for fmt, _ in fields)
66 arg_str = ', '.join(arg for _, arg in fields)
67 out(' printf("%%8b%%%(fmt_str)s", 1, %(arg_str)s)',
68 fmt_str=fmt_str, arg_str=arg_str)
69
70 out('}')
71
72 out()