4 # Babeltrace CTF Writer example script.
6 # Copyright 2013 EfficiOS Inc.
8 # Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
10 # Permission is hereby granted, free of charge, to any person obtaining a copy
11 # of this software and associated documentation files (the "Software"), to deal
12 # in the Software without restriction, including without limitation the rights
13 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 # copies of the Software, and to permit persons to whom the Software is
15 # furnished to do so, subject to the following conditions:
17 # The above copyright notice and this permission notice shall be included in
18 # all copies or substantial portions of the Software.
22 from babeltrace
import *
24 trace_path
= tempfile
.mkdtemp()
26 print("Writing trace at {}".format(trace_path
))
27 writer
= CTFWriter
.Writer(trace_path
)
29 clock
= CTFWriter
.Clock("A_clock")
30 clock
.description
= "Simple clock"
32 writer
.add_clock(clock
)
33 writer
.add_environment_field("Python_version", str(sys
.version_info
))
35 stream_class
= CTFWriter
.StreamClass("test_stream")
36 stream_class
.clock
= clock
38 event_class
= CTFWriter
.EventClass("SimpleEvent")
40 # Create a int32_t equivalent type
41 int32_type
= CTFWriter
.IntegerFieldDeclaration(32)
42 int32_type
.signed
= True
44 # Create a string type
45 string_type
= CTFWriter
.StringFieldDeclaration()
47 # Create a structure type containing both an integer and a string
48 structure_type
= CTFWriter
.StructureFieldDeclaration()
49 structure_type
.add_field(int32_type
, "an_integer")
50 structure_type
.add_field(string_type
, "a_string_field")
51 event_class
.add_field(structure_type
, "structure_field")
53 # Create a floating point type
54 floating_point_type
= CTFWriter
.FloatFieldDeclaration()
55 floating_point_type
.exponent_digits
= CTFWriter
.FloatFieldDeclaration
.FLT_EXP_DIG
56 floating_point_type
.mantissa_digits
= CTFWriter
.FloatFieldDeclaration
.FLT_MANT_DIG
57 event_class
.add_field(floating_point_type
, "float_field")
59 # Create an enumeration type
60 int10_type
= CTFWriter
.IntegerFieldDeclaration(10)
61 enumeration_type
= CTFWriter
.EnumerationFieldDeclaration(int10_type
)
62 enumeration_type
.add_mapping("FIRST_ENTRY", 0, 4)
63 enumeration_type
.add_mapping("SECOND_ENTRY", 5, 5)
64 enumeration_type
.add_mapping("THIRD_ENTRY", 6, 10)
65 event_class
.add_field(enumeration_type
, "enum_field")
67 # Create an array type
68 array_type
= CTFWriter
.ArrayFieldDeclaration(int10_type
, 5)
69 event_class
.add_field(array_type
, "array_field")
71 stream_class
.add_event_class(event_class
)
72 stream
= writer
.create_stream(stream_class
)
75 event
= CTFWriter
.Event(event_class
)
78 structure_field
= event
.payload("structure_field")
79 integer_field
= structure_field
.field("an_integer")
80 integer_field
.value
= i
82 string_field
= structure_field
.field("a_string_field")
83 string_field
.value
= "Test string."
85 float_field
= event
.payload("float_field")
86 float_field
.value
= float(i
) + (float(i
) / 100.0)
88 array_field
= event
.payload("array_field")
90 element
= array_field
.field(j
)
93 enumeration_field
= event
.payload("enum_field")
94 integer_field
= enumeration_field
.container
95 integer_field
.value
= i
% 10
97 stream
.append_event(event
)
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