xref: /openbmc/qemu/scripts/tracetool/backend/simple.py (revision 93fba1618ddbbef8bedd8d684cf356586c94bbb1) 
1#!/usr/bin/env python
2# -*- coding: utf-8 -*-
3
4"""
5Simple built-in backend.
6"""
7
8__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
9__copyright__  = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
10__license__    = "GPL version 2 or (at your option) any later version"
11
12__maintainer__ = "Stefan Hajnoczi"
13__email__      = "stefanha@linux.vnet.ibm.com"
14
15
16from tracetool import out
17
18
19PUBLIC = True
20
21
22def is_string(arg):
23    strtype = ('const char*', 'char*', 'const char *', 'char *')
24    if arg.lstrip().startswith(strtype):
25        return True
26    else:
27        return False
28
29def c(events):
30    out('#include "trace.h"',
31        '#include "trace/simple.h"',
32        '',
33        'TraceEvent trace_list[] = {')
34
35    for e in events:
36        out('{.tp_name = "%(name)s", .state=0},',
37            name = e.name,
38            )
39
40    out('};',
41        '')
42
43    for num, event in enumerate(events):
44        out('void trace_%(name)s(%(args)s)',
45            '{',
46            '    TraceBufferRecord rec;',
47            name = event.name,
48            args = event.args,
49            )
50        sizes = []
51        for type_, name in event.args:
52            if is_string(type_):
53                out('    size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
54                    name = name,
55                   )
56                strsizeinfo = "4 + arg%s_len" % name
57                sizes.append(strsizeinfo)
58            else:
59                sizes.append("8")
60        sizestr = " + ".join(sizes)
61        if len(event.args) == 0:
62            sizestr = '0'
63
64
65        out('',
66            '    if (!trace_list[%(event_id)s].state) {',
67            '        return;',
68            '    }',
69            '',
70            '    if (trace_record_start(&rec, %(event_id)s, %(size_str)s)) {',
71            '        return; /* Trace Buffer Full, Event Dropped ! */',
72            '    }',
73            event_id = num,
74            size_str = sizestr,
75            )
76
77        if len(event.args) > 0:
78            for type_, name in event.args:
79                # string
80                if is_string(type_):
81                    out('    trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
82                        name = name,
83                       )
84                # pointer var (not string)
85                elif type_.endswith('*'):
86                    out('    trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)%(name)s);',
87                        name = name,
88                       )
89                # primitive data type
90                else:
91                    out('    trace_record_write_u64(&rec, (uint64_t)%(name)s);',
92                       name = name,
93                       )
94
95        out('    trace_record_finish(&rec);',
96            '}',
97            '')
98
99
100def h(events):
101    out('#include "trace/simple.h"',
102        '')
103
104    for event in events:
105        out('void trace_%(name)s(%(args)s);',
106            name = event.name,
107            args = event.args,
108            )
109    out('')
110    out('#define NR_TRACE_EVENTS %d' % len(events))
111    out('extern TraceEvent trace_list[NR_TRACE_EVENTS];')
112