xref: /openbmc/qemu/scripts/tracetool/backend/simple.py (revision f1d630011e3bacb732c59805a54df9a8ce4b5379) 
1# -*- coding: utf-8 -*-
2
3"""
4Simple built-in 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
21def is_string(arg):
22    strtype = ('const char*', 'char*', 'const char *', 'char *')
23    arg_strip = arg.lstrip()
24    if arg_strip.startswith(strtype) and arg_strip.count('*') == 1:
25        return True
26    else:
27        return False
28
29
30def generate_h_begin(events, group):
31    for event in events:
32        out('void _simple_%(api)s(%(args)s);',
33            api=event.api(),
34            args=event.args)
35    out('')
36
37
38def generate_h(event, group):
39    event_id = 'TRACE_' + event.name.upper()
40    cond = "trace_event_get_state(%s)" % event_id
41    out('    if (%(cond)s) {',
42        '        _simple_%(api)s(%(args)s);',
43        '    }',
44        api=event.api(),
45        cond=cond,
46        args=", ".join(event.args.names()))
47
48
49def generate_h_backend_dstate(event, group):
50    out('    trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
51        event_id="TRACE_" + event.name.upper())
52
53
54def generate_c_begin(events, group):
55    out('#include "qemu/osdep.h"',
56        '#include "trace/control.h"',
57        '#include "trace/simple.h"',
58        '')
59
60
61def generate_c(event, group):
62    out('void _simple_%(api)s(%(args)s)',
63        '{',
64        '    TraceBufferRecord rec;',
65        api=event.api(),
66        args=event.args)
67    sizes = []
68    for type_, name in event.args:
69        if is_string(type_):
70            out('    size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
71                name=name)
72            strsizeinfo = "4 + arg%s_len" % name
73            sizes.append(strsizeinfo)
74        else:
75            sizes.append("8")
76    sizestr = " + ".join(sizes)
77    if len(event.args) == 0:
78        sizestr = '0'
79
80    out('',
81        '    if (trace_record_start(&rec, %(event_obj)s.id, %(size_str)s)) {',
82        '        return; /* Trace Buffer Full, Event Dropped ! */',
83        '    }',
84        event_obj=event.api(event.QEMU_EVENT),
85        size_str=sizestr)
86
87    if len(event.args) > 0:
88        for type_, name in event.args:
89            # string
90            if is_string(type_):
91                out('    trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
92                    name=name)
93            # pointer var (not string)
94            elif type_.endswith('*'):
95                out('    trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)%(name)s);',
96                    name=name)
97            # primitive data type
98            else:
99                out('    trace_record_write_u64(&rec, (uint64_t)%(name)s);',
100                   name=name)
101
102    out('    trace_record_finish(&rec);',
103        '}',
104        '')
105