Archipelago » qemu

#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

Ftrace built-in backend.

"""

__author__     = "Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>"

__copyright__  = "Copyright (C) 2013 Hitachi, Ltd."

__license__    = "GPL version 2 or (at your option) any later version"

__maintainer__ = "Stefan Hajnoczi"

__email__      = "stefanha@redhat.com"

from tracetool import out

PUBLIC = True

def c(events):

    pass

def h(events):

    out('#include "trace/ftrace.h"',

        '#include "trace/control.h"',

        '',

        )

    for e in events:

        argnames = ", ".join(e.args.names())

        if len(e.args) > 0:

            argnames = ", " + argnames

        out('static inline void trace_%(name)s(%(args)s)',

            '{',

            '    char ftrace_buf[MAX_TRACE_STRLEN];',

            '    int unused __attribute__ ((unused));',

            '    int trlen;',

            '    bool _state = trace_event_get_state(%(event_id)s);',

            '    if (_state) {',

            '        trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',

            '                         "%(name)s " %(fmt)s "\\n" %(argnames)s);',

            '        trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',

            '        unused = write(trace_marker_fd, ftrace_buf, trlen);',

            '    }',

            '}',

            name = e.name,

            args = e.args,

            event_id = "TRACE_" + e.name.upper(),

            fmt = e.fmt.rstrip("\n"),

            argnames = argnames,

            )