1# -*- coding: utf-8 -*-
2
3"""
4DTrace/SystemTAP backend.
5"""
6
7__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
8__copyright__  = "Copyright 2012-2017, 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
15from tracetool import out
16
17
18PUBLIC = True
19
20
21PROBEPREFIX = None
22
23def probeprefix():
24    if PROBEPREFIX is None:
25        raise ValueError("you must set PROBEPREFIX")
26    return PROBEPREFIX
27
28
29BINARY = None
30
31def binary():
32    if BINARY is None:
33        raise ValueError("you must set BINARY")
34    return BINARY
35
36
37def generate_h_begin(events, group):
38    if group == "root":
39        header = "trace-dtrace-root.h"
40    else:
41        header = "trace-dtrace.h"
42
43    # Workaround for ust backend, which also includes <sys/sdt.h> and may
44    # require SDT_USE_VARIADIC to be defined. If dtrace includes <sys/sdt.h>
45    # first without defining SDT_USE_VARIADIC then ust breaks because the
46    # STAP_PROBEV() macro is not defined.
47    out('#ifndef SDT_USE_VARIADIC')
48    out('#define SDT_USE_VARIADIC 1')
49    out('#endif')
50
51    out('#include "%s"' % header,
52        '')
53
54    out('#undef SDT_USE_VARIADIC')
55
56    # SystemTap defines <provider>_<name>_ENABLED() but other DTrace
57    # implementations might not.
58    for e in events:
59        out('#ifndef QEMU_%(uppername)s_ENABLED',
60            '#define QEMU_%(uppername)s_ENABLED() true',
61            '#endif',
62            uppername=e.name.upper())
63
64def generate_h(event, group):
65    out('    QEMU_%(uppername)s(%(argnames)s);',
66        uppername=event.name.upper(),
67        argnames=", ".join(event.args.names()))
68
69
70def generate_h_backend_dstate(event, group):
71    out('    QEMU_%(uppername)s_ENABLED() || \\',
72        uppername=event.name.upper())
73