Merge tag 'pull-la-20220704' of https://gitlab.com/rth7680/qemu into staging
[qemu.git] / scripts / tracetool / backend / ftrace.py
1 # -*- coding: utf-8 -*-
2
3 """
4 Ftrace built-in backend.
5 """
6
7 __author__ = "Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>"
8 __copyright__ = "Copyright (C) 2013 Hitachi, Ltd."
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
17
18 PUBLIC = True
19
20
21 def generate_h_begin(events, group):
22 out('#include "trace/ftrace.h"',
23 '')
24
25
26 def generate_h(event, group):
27 argnames = ", ".join(event.args.names())
28 if len(event.args) > 0:
29 argnames = ", " + argnames
30
31 out(' {',
32 ' char ftrace_buf[MAX_TRACE_STRLEN];',
33 ' int unused __attribute__ ((unused));',
34 ' int trlen;',
35 ' if (trace_event_get_state(%(event_id)s)) {',
36 '#line %(event_lineno)d "%(event_filename)s"',
37 ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
38 ' "%(name)s " %(fmt)s "\\n" %(argnames)s);',
39 '#line %(out_next_lineno)d "%(out_filename)s"',
40 ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
41 ' unused = write(trace_marker_fd, ftrace_buf, trlen);',
42 ' }',
43 ' }',
44 name=event.name,
45 args=event.args,
46 event_id="TRACE_" + event.name.upper(),
47 event_lineno=event.lineno,
48 event_filename=event.filename,
49 fmt=event.fmt.rstrip("\n"),
50 argnames=argnames)
51
52
53 def generate_h_backend_dstate(event, group):
54 out(' trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
55 event_id="TRACE_" + event.name.upper())