Merge remote-tracking branch 'remotes/kraxel/tags/input-20200921-pull-request' into...
[qemu.git] / scripts / tracetool / backend / simple.py
1 # -*- coding: utf-8 -*-
2
3 """
4 Simple 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
15 from tracetool import out
16
17
18 PUBLIC = True
19
20
21 def 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
30 def 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
38 def generate_h(event, group):
39 out(' _simple_%(api)s(%(args)s);',
40 api=event.api(),
41 args=", ".join(event.args.names()))
42
43
44 def generate_h_backend_dstate(event, group):
45 out(' trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
46 event_id="TRACE_" + event.name.upper())
47
48
49 def generate_c_begin(events, group):
50 out('#include "qemu/osdep.h"',
51 '#include "trace/control.h"',
52 '#include "trace/simple.h"',
53 '')
54
55
56 def generate_c(event, group):
57 out('void _simple_%(api)s(%(args)s)',
58 '{',
59 ' TraceBufferRecord rec;',
60 api=event.api(),
61 args=event.args)
62 sizes = []
63 for type_, name in event.args:
64 if is_string(type_):
65 out(' size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
66 name=name)
67 strsizeinfo = "4 + arg%s_len" % name
68 sizes.append(strsizeinfo)
69 else:
70 sizes.append("8")
71 sizestr = " + ".join(sizes)
72 if len(event.args) == 0:
73 sizestr = '0'
74
75 event_id = 'TRACE_' + event.name.upper()
76 if "vcpu" in event.properties:
77 # already checked on the generic format code
78 cond = "true"
79 else:
80 cond = "trace_event_get_state(%s)" % event_id
81
82 out('',
83 ' if (!%(cond)s) {',
84 ' return;',
85 ' }',
86 '',
87 ' if (trace_record_start(&rec, %(event_obj)s.id, %(size_str)s)) {',
88 ' return; /* Trace Buffer Full, Event Dropped ! */',
89 ' }',
90 cond=cond,
91 event_obj=event.api(event.QEMU_EVENT),
92 size_str=sizestr)
93
94 if len(event.args) > 0:
95 for type_, name in event.args:
96 # string
97 if is_string(type_):
98 out(' trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
99 name=name)
100 # pointer var (not string)
101 elif type_.endswith('*'):
102 out(' trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)%(name)s);',
103 name=name)
104 # primitive data type
105 else:
106 out(' trace_record_write_u64(&rec, (uint64_t)%(name)s);',
107 name=name)
108
109 out(' trace_record_finish(&rec);',
110 '}',
111 '')