3 # Babeltrace writer interface Python module
5 # Copyright 2012-2015 EfficiOS Inc.
7 # Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 # Permission is hereby granted, free of charge, to any person obtaining a copy
10 # of this software and associated documentation files (the "Software"), to deal
11 # in the Software without restriction, including without limitation the rights
12 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 # copies of the Software, and to permit persons to whom the Software is
14 # furnished to do so, subject to the following conditions:
16 # The above copyright notice and this permission notice shall be included in
17 # all copies or substantial portions of the Software.
19 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 import babeltrace
.nativebt
as nbt
28 import babeltrace
.common
as common
32 # Used to compare to -1ULL in error checks
33 _MAX_UINT64
= 0xFFFFFFFFFFFFFFFF
36 class EnumerationMapping
:
38 Mapping from an enumeration label to a range of integers.
41 def __init__(self
, name
, start
, end
):
43 Creates an enumeration mapping, where label *name* is mapped to
44 the [*start*, *end*] range of integers (*end* is included).
46 Set *start* and *end* to the same value to create an enumeration
47 mapping to a single value.
57 A CTF clock allows the description of the system's clock topology, as
58 well as the definition of each clock's parameters.
60 :class:`Clock` objects must be registered to a :class:`Writer`
61 object (see :meth:`Writer.add_clock`), as well as be registered to
62 a :class:`StreamClass` object (see :attr:`StreamClass.clock`).
65 def __init__(self
, name
):
67 Creates a default CTF clock named *name*.
69 :exc:`ValueError` is raised on error.
72 self
._c
= nbt
._bt
_ctf
_clock
_create
(name
)
75 raise ValueError("Invalid clock name.")
78 nbt
._bt
_ctf
_clock
_put
(self
._c
)
85 Set this attribute to change the clock's name.
87 :exc:`ValueError` is raised on error.
90 name
= nbt
._bt
_ctf
_clock
_get
_name
(self
._c
)
93 raise ValueError("Invalid clock instance.")
98 def description(self
):
100 Clock description (string).
102 Set this attribute to change the clock's description.
104 :exc:`ValueError` is raised on error.
107 return nbt
._bt
_ctf
_clock
_get
_description
(self
._c
)
110 def description(self
, desc
):
111 ret
= nbt
._bt
_ctf
_clock
_set
_description
(self
._c
, str(desc
))
114 raise ValueError("Invalid clock description.")
119 Clock frequency in Hz (integer).
121 Set this attribute to change the clock's frequency.
123 :exc:`ValueError` is raised on error.
126 freq
= nbt
._bt
_ctf
_clock
_get
_frequency
(self
._c
)
128 if freq
== _MAX_UINT64
:
129 raise ValueError("Invalid clock instance")
134 def frequency(self
, freq
):
135 ret
= nbt
._bt
_ctf
_clock
_set
_frequency
(self
._c
, freq
)
138 raise ValueError("Invalid frequency value.")
143 Clock precision in clock ticks (integer).
145 Set this attribute to change the clock's precision.
147 :exc:`ValueError` is raised on error.
150 precision
= nbt
._bt
_ctf
_clock
_get
_precision
(self
._c
)
152 if precision
== _MAX_UINT64
:
153 raise ValueError("Invalid clock instance")
158 def precision(self
, precision
):
159 ret
= nbt
._bt
_ctf
_clock
_set
_precision
(self
._c
, precision
)
162 def offset_seconds(self
):
164 Clock offset in seconds since POSIX.1 Epoch (integer).
166 Set this attribute to change the clock's offset in seconds.
168 :exc:`ValueError` is raised on error.
171 offset_s
= nbt
._bt
_ctf
_clock
_get
_offset
_s
(self
._c
)
173 if offset_s
== _MAX_UINT64
:
174 raise ValueError("Invalid clock instance")
178 @offset_seconds.setter
179 def offset_seconds(self
, offset_s
):
180 ret
= nbt
._bt
_ctf
_clock
_set
_offset
_s
(self
._c
, offset_s
)
183 raise ValueError("Invalid offset value.")
188 Clock offset in ticks since (POSIX.1 Epoch +
189 :attr:`offset_seconds`).
191 Set this attribute to change the clock's offset.
193 :exc:`ValueError` is raised on error.
196 offset
= nbt
._bt
_ctf
_clock
_get
_offset
(self
._c
)
198 if offset
== _MAX_UINT64
:
199 raise ValueError("Invalid clock instance")
204 def offset(self
, offset
):
205 ret
= nbt
._bt
_ctf
_clock
_set
_offset
(self
._c
, offset
)
208 raise ValueError("Invalid offset value.")
213 ``True`` if this clock is absolute, i.e. if the clock is a
214 global reference across the other clocks of the trace.
216 Set this attribute to change the clock's absolute state
219 :exc:`ValueError` is raised on error.
222 is_absolute
= nbt
._bt
_ctf
_clock
_get
_is
_absolute
(self
._c
)
224 if is_absolute
== -1:
225 raise ValueError("Invalid clock instance")
227 return False if is_absolute
== 0 else True
230 def absolute(self
, is_absolute
):
231 ret
= nbt
._bt
_ctf
_clock
_set
_is
_absolute
(self
._c
, int(is_absolute
))
234 raise ValueError("Could not set the clock absolute attribute.")
239 Clock UUID (an :class:`uuid.UUID` object).
241 Set this attribute to change the clock's UUID.
243 :exc:`ValueError` is raised on error.
249 ret
, value
= nbt
._bt
_python
_ctf
_clock
_get
_uuid
_index
(self
._c
, i
)
252 raise ValueError("Invalid clock instance")
254 uuid_list
.append(value
)
256 return UUID(bytes
=bytes(uuid_list
))
259 def uuid(self
, uuid
):
260 uuid_bytes
= uuid
.bytes
262 if len(uuid_bytes
) != 16:
263 raise ValueError("Invalid UUID provided. UUID length must be 16 bytes")
265 for i
in range(len(uuid_bytes
)):
266 ret
= nbt
._bt
_python
_ctf
_clock
_set
_uuid
_index
(self
._c
, i
,
270 raise ValueError("Invalid clock instance")
275 Clock current time; nanoseconds (integer) since clock origin
276 (POSIX.1 Epoch + :attr:`offset_seconds` + :attr:`offset`).
278 Set this attribute to change the clock's current time.
280 :exc:`ValueError` is raised on error.
283 time
= nbt
._bt
_ctf
_clock
_get
_time
(self
._c
)
285 if time
== _MAX_UINT64
:
286 raise ValueError("Invalid clock instance")
291 def time(self
, time
):
292 ret
= nbt
._bt
_ctf
_clock
_set
_time
(self
._c
, time
)
295 raise ValueError("Invalid time value.")
300 Display base of an integer.
304 INTEGER_BASE_UNKNOWN
= -1
307 INTEGER_BASE_BINARY
= 2
310 INTEGER_BASE_OCTAL
= 8
313 INTEGER_BASE_DECIMAL
= 10
316 INTEGER_BASE_HEXADECIMAL
= 16
319 class FieldDeclaration
:
321 Base class of all field declarations. This class is not meant to
322 be instantiated by the user; use one of the concrete field
323 declaration subclasses instead.
326 class IntegerBase(IntegerBase
):
331 raise ValueError("FieldDeclaration creation failed.")
334 nbt
._bt
_ctf
_field
_type
_put
(self
._ft
)
337 def _create_field_declaration_from_native_instance(
338 native_field_declaration
):
340 common
.CTFTypeId
.INTEGER
: IntegerFieldDeclaration
,
341 common
.CTFTypeId
.FLOAT
: FloatFieldDeclaration
,
342 common
.CTFTypeId
.ENUM
: EnumerationFieldDeclaration
,
343 common
.CTFTypeId
.STRING
: StringFieldDeclaration
,
344 common
.CTFTypeId
.STRUCT
: StructureFieldDeclaration
,
345 common
.CTFTypeId
.VARIANT
: VariantFieldDeclaration
,
346 common
.CTFTypeId
.ARRAY
: ArrayFieldDeclaration
,
347 common
.CTFTypeId
.SEQUENCE
: SequenceFieldDeclaration
350 field_type_id
= nbt
._bt
_ctf
_field
_type
_get
_type
_id
(native_field_declaration
)
352 if field_type_id
== common
.CTFTypeId
.UNKNOWN
:
353 raise TypeError("Invalid field instance")
355 declaration
= Field
.__new
__(Field
)
356 declaration
._ft
= native_field_declaration
357 declaration
.__class
__ = type_dict
[field_type_id
]
364 Field alignment in bits (integer).
366 Set this attribute to change this field's alignment.
368 :exc:`ValueError` is raised on error.
371 return nbt
._bt
_ctf
_field
_type
_get
_alignment
(self
._ft
)
374 def alignment(self
, alignment
):
375 ret
= nbt
._bt
_ctf
_field
_type
_set
_alignment
(self
._ft
, alignment
)
378 raise ValueError("Invalid alignment value.")
381 def byte_order(self
):
383 Field byte order (one of :class:`babeltrace.common.ByteOrder`
386 Set this attribute to change this field's byte order.
388 :exc:`ValueError` is raised on error.
391 return nbt
._bt
_ctf
_field
_type
_get
_byte
_order
(self
._ft
)
394 def byte_order(self
, byte_order
):
395 ret
= nbt
._bt
_ctf
_field
_type
_set
_byte
_order
(self
._ft
, byte_order
)
398 raise ValueError("Could not set byte order value.")
401 class IntegerFieldDeclaration(FieldDeclaration
):
403 Integer field declaration.
406 def __init__(self
, size
):
408 Creates an integer field declaration of size *size* bits.
410 :exc:`ValueError` is raised on error.
413 self
._ft
= nbt
._bt
_ctf
_field
_type
_integer
_create
(size
)
419 Integer size in bits (integer).
421 Set this attribute to change this integer's size.
423 :exc:`ValueError` is raised on error.
426 ret
= nbt
._bt
_ctf
_field
_type
_integer
_get
_size
(self
._ft
)
429 raise ValueError("Could not get Integer size attribute.")
436 ``True`` if this integer is signed.
438 Set this attribute to change this integer's signedness
441 :exc:`ValueError` is raised on error.
444 ret
= nbt
._bt
_ctf
_field
_type
_integer
_get
_signed
(self
._ft
)
447 raise ValueError("Could not get Integer signed attribute.")
454 def signed(self
, signed
):
455 ret
= nbt
._bt
_ctf
_field
_type
_integer
_set
_signed
(self
._ft
, signed
)
458 raise ValueError("Could not set Integer signed attribute.")
463 Integer display base (one of :class:`IntegerBase` constants).
465 Set this attribute to change this integer's display base.
467 :exc:`ValueError` is raised on error.
470 return nbt
._bt
_ctf
_field
_type
_integer
_get
_base
(self
._ft
)
473 def base(self
, base
):
474 ret
= nbt
._bt
_ctf
_field
_type
_integer
_set
_base
(self
._ft
, base
)
477 raise ValueError("Could not set Integer base.")
482 Integer encoding (one of
483 :class:`babeltrace.common.CTFStringEncoding` constants).
485 Set this attribute to change this integer's encoding.
487 :exc:`ValueError` is raised on error.
490 return nbt
._bt
_ctf
_field
_type
_integer
_get
_encoding
(self
._ft
)
493 def encoding(self
, encoding
):
494 ret
= nbt
._bt
_ctf
_field
_type
_integer
_set
_encoding
(self
._ft
, encoding
)
497 raise ValueError("Could not set Integer encoding.")
500 class EnumerationFieldDeclaration(FieldDeclaration
):
502 Enumeration field declaration. A CTF enumeration maps labels to
506 def __init__(self
, integer_type
):
508 Creates an enumeration field declaration, with *integer_type*
509 being the underlying :class:`IntegerFieldDeclaration` for storing
512 :exc:`ValueError` is raised on error.
515 isinst
= isinstance(integer_type
, IntegerFieldDeclaration
)
517 if integer_type
is None or not isinst
:
518 raise TypeError("Invalid integer container.")
520 self
._ft
= nbt
._bt
_ctf
_field
_type
_enumeration
_create
(integer_type
._ft
)
526 Underlying container (:class:`IntegerFieldDeclaration`).
528 :exc:`TypeError` is raised on error.
531 ret
= nbt
._bt
_ctf
_field
_type
_enumeration
_get
_container
_type
(self
._ft
)
534 raise TypeError("Invalid enumeration declaration")
536 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(ret
)
538 def add_mapping(self
, name
, range_start
, range_end
):
540 Adds a mapping to the enumeration field declaration, from the
541 label named *name* to range [*range_start*, *range_end*], where
542 *range_start* and *range_end* are integers included in the
545 :exc:`ValueError` is raised on error.
548 if range_start
< 0 or range_end
< 0:
549 ret
= nbt
._bt
_ctf
_field
_type
_enumeration
_add
_mapping
(self
._ft
,
554 ret
= nbt
._bt
_ctf
_field
_type
_enumeration
_add
_mapping
_unsigned
(self
._ft
,
560 raise ValueError("Could not add mapping to enumeration declaration.")
565 Generates the mappings of this enumeration field declaration
566 (:class:`EnumerationMapping` objects).
568 :exc:`TypeError` is raised on error.
571 signed
= self
.container
.signed
573 count
= nbt
._bt
_ctf
_field
_type
_enumeration
_get
_mapping
_count
(self
._ft
)
575 for i
in range(count
):
577 ret
= nbt
._bt
_python
_ctf
_field
_type
_enumeration
_get
_mapping
(self
._ft
, i
)
579 ret
= nbt
._bt
_python
_ctf
_field
_type
_enumeration
_get
_mapping
_unsigned
(self
._ft
, i
)
582 msg
= "Could not get Enumeration mapping at index {}".format(i
)
585 name
, range_start
, range_end
= ret
586 yield EnumerationMapping(name
, range_start
, range_end
)
588 def get_mapping_by_name(self
, name
):
590 Returns the :class:`EnumerationMapping` object for the label
593 :exc:`TypeError` is raised on error.
596 index
= nbt
._bt
_ctf
_field
_type
_enumeration
_get
_mapping
_index
_by
_name
(self
._ft
, name
)
601 if self
.container
.signed
:
602 ret
= nbt
._bt
_python
_ctf
_field
_type
_enumeration
_get
_mapping
(self
._ft
, index
)
604 ret
= nbt
._bt
_python
_ctf
_field
_type
_enumeration
_get
_mapping
_unsigned
(self
._ft
, index
)
607 msg
= "Could not get Enumeration mapping at index {}".format(i
)
610 name
, range_start
, range_end
= ret
612 return EnumerationMapping(name
, range_start
, range_end
)
614 def get_mapping_by_value(self
, value
):
616 Returns the :class:`EnumerationMapping` object for the value
619 :exc:`TypeError` is raised on error.
623 index
= nbt
._bt
_ctf
_field
_type
_enumeration
_get
_mapping
_index
_by
_value
(self
._ft
, value
)
625 index
= nbt
._bt
_ctf
_field
_type
_enumeration
_get
_mapping
_index
_by
_unsigned
_value
(self
._ft
, value
)
630 if self
.container
.signed
:
631 ret
= nbt
._bt
_python
_ctf
_field
_type
_enumeration
_get
_mapping
(self
._ft
, index
)
633 ret
= nbt
._bt
_python
_ctf
_field
_type
_enumeration
_get
_mapping
_unsigned
(self
._ft
, index
)
636 msg
= "Could not get Enumeration mapping at index {}".format(i
)
639 name
, range_start
, range_end
= ret
641 return EnumerationMapping(name
, range_start
, range_end
)
644 class FloatingPointFieldDeclaration(FieldDeclaration
):
646 Floating point number field declaration.
648 A CTF floating point number is a made of three sections: the sign
649 bit, the exponent bits, and the mantissa bits. The most significant
650 bit of the resulting binary word is the sign bit, and is included
651 in the number of mantissa bits.
654 `IEEE 754 <http://en.wikipedia.org/wiki/IEEE_floating_point>`_
655 single precision floating point number is represented on a 32-bit
656 word using an 8-bit exponent (``e``) and a 24-bit mantissa (``m``),
657 the latter count including the sign bit (``s``)::
659 s eeeeeeee mmmmmmmmmmmmmmmmmmmmmmm
661 The IEEE 754 double precision floating point number uses an
662 11-bit exponent and a 53-bit mantissa.
665 #: IEEE 754 single precision floating point number exponent size
668 #: IEEE 754 double precision floating point number exponent size
671 #: IEEE 754 single precision floating point number mantissa size
674 #: IEEE 754 double precision floating point number mantissa size
679 Creates a floating point number field declaration.
681 :exc:`ValueError` is raised on error.
684 self
._ft
= nbt
._bt
_ctf
_field
_type
_floating
_point
_create
()
688 def exponent_digits(self
):
690 Floating point number exponent section size in bits (integer).
692 Set this attribute to change the floating point number's
693 exponent section's size. You may use :attr:`FLT_EXP_DIG` or
694 :attr:`DBL_EXP_DIG` for IEEE 754 floating point numbers.
696 :exc:`ValueError` is raised on error.
699 ret
= nbt
._bt
_ctf
_field
_type
_floating
_point
_get
_exponent
_digits
(self
._ft
)
703 "Could not get Floating point exponent digit count")
707 @exponent_digits.setter
708 def exponent_digits(self
, exponent_digits
):
709 ret
= nbt
._bt
_ctf
_field
_type
_floating
_point
_set
_exponent
_digits
(self
._ft
,
713 raise ValueError("Could not set exponent digit count.")
716 def mantissa_digits(self
):
718 Floating point number mantissa section size in bits (integer).
720 Set this attribute to change the floating point number's
721 mantissa section's size. You may use :attr:`FLT_MANT_DIG` or
722 :attr:`DBL_MANT_DIG` for IEEE 754 floating point numbers.
724 :exc:`ValueError` is raised on error.
727 ret
= nbt
._bt
_ctf
_field
_type
_floating
_point
_get
_mantissa
_digits
(self
._ft
)
730 raise TypeError("Could not get Floating point mantissa digit count")
734 @mantissa_digits.setter
735 def mantissa_digits(self
, mantissa_digits
):
736 ret
= nbt
._bt
_ctf
_field
_type
_floating
_point
_set
_mantissa
_digits
(self
._ft
,
740 raise ValueError("Could not set mantissa digit count.")
743 class FloatFieldDeclaration(FloatingPointFieldDeclaration
):
747 class StructureFieldDeclaration(FieldDeclaration
):
749 Structure field declaration, i.e. an ordered mapping from field
750 names to field declarations.
755 Creates an empty structure field declaration.
757 :exc:`ValueError` is raised on error.
760 self
._ft
= nbt
._bt
_ctf
_field
_type
_structure
_create
()
763 def add_field(self
, field_type
, field_name
):
765 Appends one :class:`FieldDeclaration` *field_type* named
766 *field_name* to the structure's ordered map.
768 :exc:`ValueError` is raised on error.
771 ret
= nbt
._bt
_ctf
_field
_type
_structure
_add
_field
(self
._ft
,
776 raise ValueError("Could not add field to structure.")
781 Generates the (field name, :class:`FieldDeclaration`) pairs
784 :exc:`TypeError` is raised on error.
787 count
= nbt
._bt
_ctf
_field
_type
_structure
_get
_field
_count
(self
._ft
)
790 raise TypeError("Could not get Structure field count")
792 for i
in range(count
):
793 field_name
= nbt
._bt
_python
_ctf
_field
_type
_structure
_get
_field
_name
(self
._ft
, i
)
795 if field_name
is None:
796 msg
= "Could not get Structure field name at index {}".format(i
)
799 field_type_native
= nbt
._bt
_python
_ctf
_field
_type
_structure
_get
_field
_type
(self
._ft
, i
)
801 if field_type_native
is None:
802 msg
= "Could not get Structure field type at index {}".format(i
)
805 field_type
= FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
806 yield (field_name
, field_type
)
808 def get_field_by_name(self
, name
):
810 Returns the :class:`FieldDeclaration` mapped to the field name
811 *name* in this structure.
813 :exc:`TypeError` is raised on error.
816 field_type_native
= nbt
._bt
_ctf
_field
_type
_structure
_get
_field
_type
_by
_name
(self
._ft
, name
)
818 if field_type_native
is None:
819 msg
= "Could not find Structure field with name {}".format(name
)
822 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
825 class VariantFieldDeclaration(FieldDeclaration
):
827 Variant field declaration.
829 A CTF variant is a dynamic selection between different fields.
830 The value of a *tag* (a CTF enumeration) determines what is the
831 current selected field. All the possible fields must be added to
832 its field declaration before using an actual variant field.
835 def __init__(self
, enum_tag
, tag_name
):
837 Creates an empty variant field declaration with tag field
838 declaration *enum_tag* (instance of
839 :class:`EnumerationFieldDeclaration`) named *tag_name*
842 :exc:`ValueError` is raised on error.
845 isinst
= isinstance(enum_tag
, EnumerationFieldDeclaration
)
846 if enum_tag
is None or not isinst
:
847 raise TypeError("Invalid tag type; must be of type EnumerationFieldDeclaration.")
849 self
._ft
= nbt
._bt
_ctf
_field
_type
_variant
_create
(enum_tag
._ft
,
856 Variant field declaration tag name.
858 :exc:`TypeError` is raised on error.
861 ret
= nbt
._bt
_ctf
_field
_type
_variant
_get
_tag
_name
(self
._ft
)
864 raise TypeError("Could not get Variant tag name")
871 Variant field declaration tag field declaration
872 (:class:`EnumerationFieldDeclaration` object).
874 :exc:`TypeError` is raised on error.
877 ret
= nbt
._bt
_ctf
_field
_type
_variant
_get
_tag
_type
(self
._ft
)
880 raise TypeError("Could not get Variant tag type")
882 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(ret
)
884 def add_field(self
, field_type
, field_name
):
886 Registers the :class:`FieldDeclaration` object *field_type*
887 as the variant's selected type when the variant's tag's current
888 label is *field_name*.
890 :exc:`ValueError` is raised on error.
893 ret
= nbt
._bt
_ctf
_field
_type
_variant
_add
_field
(self
._ft
,
898 raise ValueError("Could not add field to variant.")
903 Generates the (field name, :class:`FieldDeclaration`) pairs
904 of this variant field declaration.
906 :exc:`TypeError` is raised on error.
909 count
= nbt
._bt
_ctf
_field
_type
_variant
_get
_field
_count
(self
._ft
)
912 raise TypeError("Could not get Variant field count")
914 for i
in range(count
):
915 field_name
= nbt
._bt
_python
_ctf
_field
_type
_variant
_get
_field
_name
(self
._ft
, i
)
917 if field_name
is None:
918 msg
= "Could not get Variant field name at index {}".format(i
)
921 field_type_native
= nbt
._bt
_python
_ctf
_field
_type
_variant
_get
_field
_type
(self
._ft
, i
)
923 if field_type_native
is None:
924 msg
= "Could not get Variant field type at index {}".format(i
)
927 field_type
= FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
928 yield (field_name
, field_type
)
930 def get_field_by_name(self
, name
):
932 Returns the :class:`FieldDeclaration` selected when the
933 variant's tag's current label is *name*.
935 :exc:`TypeError` is raised on error.
938 field_type_native
= nbt
._bt
_ctf
_field
_type
_variant
_get
_field
_type
_by
_name
(self
._ft
,
941 if field_type_native
is None:
942 msg
= "Could not find Variant field with name {}".format(name
)
945 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
947 def get_field_from_tag(self
, tag
):
949 Returns the :class:`FieldDeclaration` selected by the current
950 label of the :class:`EnumerationField` *tag*.
952 :exc:`TypeError` is raised on error.
955 field_type_native
= nbt
._bt
_ctf
_field
_type
_variant
_get
_field
_type
_from
_tag
(self
._ft
, tag
._f
)
957 if field_type_native
is None:
958 msg
= "Could not find Variant field with tag value {}".format(tag
.value
)
961 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
964 class ArrayFieldDeclaration(FieldDeclaration
):
965 def __init__(self
, element_type
, length
):
967 Create a new array field declaration.
970 self
._ft
= nbt
._bt
_ctf
_field
_type
_array
_create
(element_type
._ft
,
975 def element_type(self
):
977 Get the array's element type.
980 ret
= nbt
._bt
_ctf
_field
_type
_array
_get
_element
_type
(self
._ft
)
983 raise TypeError("Could not get Array element type")
985 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(ret
)
990 Get the array's length.
993 ret
= nbt
._bt
_ctf
_field
_type
_array
_get
_length
(self
._ft
)
996 raise TypeError("Could not get Array length")
1001 class SequenceFieldDeclaration(FieldDeclaration
):
1002 def __init__(self
, element_type
, length_field_name
):
1004 Create a new sequence field declaration.
1007 self
._ft
= nbt
._bt
_ctf
_field
_type
_sequence
_create
(element_type
._ft
,
1008 str(length_field_name
))
1012 def element_type(self
):
1014 Get the sequence's element type.
1017 ret
= nbt
._bt
_ctf
_field
_type
_sequence
_get
_element
_type
(self
._ft
)
1020 raise TypeError("Could not get Sequence element type")
1022 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(ret
)
1025 def length_field_name(self
):
1027 Get the sequence's length field name.
1030 ret
= nbt
._bt
_ctf
_field
_type
_sequence
_get
_length
_field
_name
(self
._ft
)
1033 raise TypeError("Could not get Sequence length field name")
1038 class StringFieldDeclaration(FieldDeclaration
):
1041 Create a new string field declaration.
1044 self
._ft
= nbt
._bt
_ctf
_field
_type
_string
_create
()
1050 Get a string declaration's encoding (a constant from the CTFStringEncoding class).
1053 return nbt
._bt
_ctf
_field
_type
_string
_get
_encoding
(self
._ft
)
1056 def encoding(self
, encoding
):
1058 Set a string declaration's encoding. Must be a constant from the CTFStringEncoding class.
1061 ret
= nbt
._bt
_ctf
_field
_type
_string
_set
_encoding
(self
._ft
, encoding
)
1063 raise ValueError("Could not set string encoding.")
1067 def create_field(field_type
):
1069 Create an instance of a field.
1071 isinst
= isinstance(field_type
, FieldDeclaration
)
1073 if field_type
is None or not isinst
:
1074 raise TypeError("Invalid field_type. Type must be a FieldDeclaration-derived class.")
1076 if isinstance(field_type
, IntegerFieldDeclaration
):
1077 return IntegerField(field_type
)
1078 elif isinstance(field_type
, EnumerationFieldDeclaration
):
1079 return EnumerationField(field_type
)
1080 elif isinstance(field_type
, FloatFieldDeclaration
):
1081 return FloatingPointField(field_type
)
1082 elif isinstance(field_type
, StructureFieldDeclaration
):
1083 return StructureField(field_type
)
1084 elif isinstance(field_type
, VariantFieldDeclaration
):
1085 return VariantField(field_type
)
1086 elif isinstance(field_type
, ArrayFieldDeclaration
):
1087 return ArrayField(field_type
)
1088 elif isinstance(field_type
, SequenceFieldDeclaration
):
1089 return SequenceField(field_type
)
1090 elif isinstance(field_type
, StringFieldDeclaration
):
1091 return StringField(field_type
)
1096 Base class, do not instantiate.
1099 def __init__(self
, field_type
):
1100 if not isinstance(field_type
, FieldDeclaration
):
1101 raise TypeError("Invalid field_type argument.")
1103 self
._f
= nbt
._bt
_ctf
_field
_create
(field_type
._ft
)
1106 raise ValueError("Field creation failed.")
1109 nbt
._bt
_ctf
_field
_put
(self
._f
)
1112 def _create_field_from_native_instance(native_field_instance
):
1114 common
.CTFTypeId
.INTEGER
: IntegerField
,
1115 common
.CTFTypeId
.FLOAT
: FloatingPointField
,
1116 common
.CTFTypeId
.ENUM
: EnumerationField
,
1117 common
.CTFTypeId
.STRING
: StringField
,
1118 common
.CTFTypeId
.STRUCT
: StructureField
,
1119 common
.CTFTypeId
.VARIANT
: VariantField
,
1120 common
.CTFTypeId
.ARRAY
: ArrayField
,
1121 common
.CTFTypeId
.SEQUENCE
: SequenceField
1124 field_type
= nbt
._bt
_python
_get
_field
_type
(native_field_instance
)
1126 if field_type
== common
.CTFTypeId
.UNKNOWN
:
1127 raise TypeError("Invalid field instance")
1129 field
= Field
.__new
__(Field
)
1130 field
._f
= native_field_instance
1131 field
.__class
__ = type_dict
[field_type
]
1136 def declaration(self
):
1137 native_field_type
= nbt
._bt
_ctf
_field
_get
_type
(self
._f
)
1139 if native_field_type
is None:
1140 raise TypeError("Invalid field instance")
1141 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(
1145 class IntegerField(Field
):
1149 Get an integer field's value.
1152 signedness
= nbt
._bt
_python
_field
_integer
_get
_signedness
(self
._f
)
1155 raise TypeError("Invalid integer instance.")
1158 ret
, value
= nbt
._bt
_ctf
_field
_unsigned
_integer
_get
_value
(self
._f
)
1160 ret
, value
= nbt
._bt
_ctf
_field
_signed
_integer
_get
_value
(self
._f
)
1163 raise ValueError("Could not get integer field value.")
1168 def value(self
, value
):
1170 Set an integer field's value.
1173 if not isinstance(value
, int):
1174 raise TypeError("IntegerField's value must be an int")
1176 signedness
= nbt
._bt
_python
_field
_integer
_get
_signedness
(self
._f
)
1178 raise TypeError("Invalid integer instance.")
1181 ret
= nbt
._bt
_ctf
_field
_unsigned
_integer
_set
_value
(self
._f
, value
)
1183 ret
= nbt
._bt
_ctf
_field
_signed
_integer
_set
_value
(self
._f
, value
)
1186 raise ValueError("Could not set integer field value.")
1189 class EnumerationField(Field
):
1191 def container(self
):
1193 Return the enumeration's underlying container field (an integer field).
1196 container
= IntegerField
.__new
__(IntegerField
)
1197 container
._f
= nbt
._bt
_ctf
_field
_enumeration
_get
_container
(self
._f
)
1199 if container
._f
is None:
1200 raise TypeError("Invalid enumeration field type.")
1207 Get the enumeration field's mapping name.
1210 value
= nbt
._bt
_ctf
_field
_enumeration
_get
_mapping
_name
(self
._f
)
1213 raise ValueError("Could not get enumeration's mapping name.")
1218 def value(self
, value
):
1220 Set the enumeration field's value. Must be an integer as mapping names
1224 if not isinstance(value
, int):
1225 raise TypeError("EnumerationField value must be an int")
1227 self
.container
.value
= value
1230 class FloatingPointField(Field
):
1234 Get a floating point field's value.
1237 ret
, value
= nbt
._bt
_ctf
_field
_floating
_point
_get
_value
(self
._f
)
1240 raise ValueError("Could not get floating point field value.")
1245 def value(self
, value
):
1247 Set a floating point field's value.
1250 if not isinstance(value
, int) and not isinstance(value
, float):
1251 raise TypeError("Value must be either a float or an int")
1253 ret
= nbt
._bt
_ctf
_field
_floating
_point
_set
_value
(self
._f
, float(value
))
1256 raise ValueError("Could not set floating point field value.")
1259 # oops!! This class is provided to ensure backward-compatibility since
1260 # a stable release publicly exposed this abomination.
1261 class FloatFieldingPoint(FloatingPointField
):
1265 class StructureField(Field
):
1266 def field(self
, field_name
):
1268 Get the structure's field corresponding to the provided field name.
1271 native_instance
= nbt
._bt
_ctf
_field
_structure
_get
_field
(self
._f
,
1274 if native_instance
is None:
1275 raise ValueError("Invalid field_name provided.")
1277 return Field
._create
_field
_from
_native
_instance
(native_instance
)
1280 class VariantField(Field
):
1281 def field(self
, tag
):
1283 Return the variant's selected field. The "tag" field is the selector enum field.
1286 native_instance
= nbt
._bt
_ctf
_field
_variant
_get
_field
(self
._f
, tag
._f
)
1288 if native_instance
is None:
1289 raise ValueError("Invalid tag provided.")
1291 return Field
._create
_field
_from
_native
_instance
(native_instance
)
1294 class ArrayField(Field
):
1295 def field(self
, index
):
1297 Return the array's field at position "index".
1300 native_instance
= nbt
._bt
_ctf
_field
_array
_get
_field
(self
._f
, index
)
1302 if native_instance
is None:
1303 raise IndexError("Invalid index provided.")
1305 return Field
._create
_field
_from
_native
_instance
(native_instance
)
1308 class SequenceField(Field
):
1312 Get the sequence's length field (IntegerField).
1315 native_instance
= nbt
._bt
_ctf
_field
_sequence
_get
_length
(self
._f
)
1317 if native_instance
is None:
1320 return Field
._create
_field
_from
_native
_instance
(native_instance
)
1323 def length(self
, length_field
):
1325 Set the sequence's length field (IntegerField).
1328 if not isinstance(length_field
, IntegerField
):
1329 raise TypeError("Invalid length field.")
1331 if length_field
.declaration
.signed
:
1332 raise TypeError("Sequence field length must be unsigned")
1334 ret
= nbt
._bt
_ctf
_field
_sequence
_set
_length
(self
._f
, length_field
._f
)
1337 raise ValueError("Could not set sequence length.")
1339 def field(self
, index
):
1341 Return the sequence's field at position "index".
1344 native_instance
= nbt
._bt
_ctf
_field
_sequence
_get
_field
(self
._f
, index
)
1346 if native_instance
is None:
1347 raise ValueError("Could not get sequence element at index.")
1349 return Field
._create
_field
_from
_native
_instance
(native_instance
)
1352 class StringField(Field
):
1356 Get a string field's value.
1359 return nbt
._bt
_ctf
_field
_string
_get
_value
(self
._f
)
1362 def value(self
, value
):
1364 Set a string field's value.
1367 ret
= nbt
._bt
_ctf
_field
_string
_set
_value
(self
._f
, str(value
))
1370 raise ValueError("Could not set string field value.")
1374 def __init__(self
, name
):
1376 Create a new event class of the given name.
1379 self
._ec
= nbt
._bt
_ctf
_event
_class
_create
(name
)
1381 if self
._ec
is None:
1382 raise ValueError("Event class creation failed.")
1385 nbt
._bt
_ctf
_event
_class
_put
(self
._ec
)
1387 def add_field(self
, field_type
, field_name
):
1389 Add a field of type "field_type" to the event class.
1392 ret
= nbt
._bt
_ctf
_event
_class
_add
_field
(self
._ec
, field_type
._ft
,
1396 raise ValueError("Could not add field to event class.")
1401 Get the event class' name.
1404 name
= nbt
._bt
_ctf
_event
_class
_get
_name
(self
._ec
)
1407 raise TypeError("Could not get EventClass name")
1414 Get the event class' id. Returns a negative value if unset.
1417 id = nbt
._bt
_ctf
_event
_class
_get
_id
(self
._ec
)
1420 raise TypeError("Could not get EventClass id")
1427 Set the event class' id. Throws a TypeError if the event class
1428 is already registered to a stream class.
1431 ret
= nbt
._bt
_ctf
_event
_class
_set
_id
(self
._ec
, id)
1434 raise TypeError("Can't change an Event Class's id after it has been assigned to a stream class")
1437 def stream_class(self
):
1439 Get the event class' stream class. Returns None if unset.
1441 stream_class_native
= nbt
._bt
_ctf
_event
_class
_get
_stream
_class
(self
._ec
)
1443 if stream_class_native
is None:
1446 stream_class
= StreamClass
.__new
__(StreamClass
)
1447 stream_class
._sc
= stream_class_native
1454 Generator returning the event class' fields as tuples of (field name, field declaration).
1457 count
= nbt
._bt
_ctf
_event
_class
_get
_field
_count
(self
._ec
)
1460 raise TypeError("Could not get EventClass' field count")
1462 for i
in range(count
):
1463 field_name
= nbt
._bt
_python
_ctf
_event
_class
_get
_field
_name
(self
._ec
, i
)
1465 if field_name
is None:
1466 msg
= "Could not get EventClass' field name at index {}".format(i
)
1467 raise TypeError(msg
)
1469 field_type_native
= nbt
._bt
_python
_ctf
_event
_class
_get
_field
_type
(self
._ec
, i
)
1471 if field_type_native
is None:
1472 msg
= "Could not get EventClass' field type at index {}".format(i
)
1473 raise TypeError(msg
)
1475 field_type
= FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
1476 yield (field_name
, field_type
)
1478 def get_field_by_name(self
, name
):
1480 Get a field declaration by name (FieldDeclaration).
1483 field_type_native
= nbt
._bt
_ctf
_event
_class
_get
_field
_by
_name
(self
._ec
, name
)
1485 if field_type_native
is None:
1486 msg
= "Could not find EventClass field with name {}".format(name
)
1487 raise TypeError(msg
)
1489 return FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
1493 def __init__(self
, event_class
):
1495 Create a new event of the given event class.
1498 if not isinstance(event_class
, EventClass
):
1499 raise TypeError("Invalid event_class argument.")
1501 self
._e
= nbt
._bt
_ctf
_event
_create
(event_class
._ec
)
1504 raise ValueError("Event creation failed.")
1507 nbt
._bt
_ctf
_event
_put
(self
._e
)
1510 def event_class(self
):
1512 Get the event's class.
1515 event_class_native
= nbt
._bt
_ctf
_event
_get
_class
(self
._e
)
1517 if event_class_native
is None:
1520 event_class
= EventClass
.__new
__(EventClass
)
1521 event_class
._ec
= event_class_native
1527 Get a clock from event. Returns None if the event's class
1528 is not registered to a stream class.
1531 clock_instance
= nbt
._bt
_ctf
_event
_get
_clock
(self
._e
)
1533 if clock_instance
is None:
1536 clock
= Clock
.__new
__(Clock
)
1537 clock
._c
= clock_instance
1541 def payload(self
, field_name
):
1543 Get a field from event.
1546 native_instance
= nbt
._bt
_ctf
_event
_get
_payload
(self
._e
,
1549 if native_instance
is None:
1550 raise ValueError("Could not get event payload.")
1552 return Field
._create
_field
_from
_native
_instance
(native_instance
)
1554 def set_payload(self
, field_name
, value_field
):
1556 Set a manually created field as an event's payload.
1559 if not isinstance(value
, Field
):
1560 raise TypeError("Invalid value type.")
1562 ret
= nbt
._bt
_ctf
_event
_set
_payload
(self
._e
, str(field_name
),
1566 raise ValueError("Could not set event field payload.")
1570 def __init__(self
, name
):
1572 Create a new stream class of the given name.
1575 self
._sc
= nbt
._bt
_ctf
_stream
_class
_create
(name
)
1577 if self
._sc
is None:
1578 raise ValueError("Stream class creation failed.")
1581 nbt
._bt
_ctf
_stream
_class
_put
(self
._sc
)
1586 Get a stream class' name.
1589 name
= nbt
._bt
_ctf
_stream
_class
_get
_name
(self
._sc
)
1592 raise TypeError("Could not get StreamClass name")
1599 Get a stream class' clock.
1602 clock_instance
= nbt
._bt
_ctf
_stream
_class
_get
_clock
(self
._sc
)
1604 if clock_instance
is None:
1607 clock
= Clock
.__new
__(Clock
)
1608 clock
._c
= clock_instance
1613 def clock(self
, clock
):
1615 Assign a clock to a stream class.
1618 if not isinstance(clock
, Clock
):
1619 raise TypeError("Invalid clock type.")
1621 ret
= nbt
._bt
_ctf
_stream
_class
_set
_clock
(self
._sc
, clock
._c
)
1624 raise ValueError("Could not set stream class clock.")
1629 Get a stream class' id.
1632 ret
= nbt
._bt
_ctf
_stream
_class
_get
_id
(self
._sc
)
1635 raise TypeError("Could not get StreamClass id")
1642 Assign an id to a stream class.
1645 ret
= nbt
._bt
_ctf
_stream
_class
_set
_id
(self
._sc
, id)
1648 raise TypeError("Could not set stream class id.")
1651 def event_classes(self
):
1653 Generator returning the stream class' event classes.
1656 count
= nbt
._bt
_ctf
_stream
_class
_get
_event
_class
_count
(self
._sc
)
1659 raise TypeError("Could not get StreamClass' event class count")
1661 for i
in range(count
):
1662 event_class_native
= nbt
._bt
_ctf
_stream
_class
_get
_event
_class
(self
._sc
, i
)
1664 if event_class_native
is None:
1665 msg
= "Could not get StreamClass' event class at index {}".format(i
)
1666 raise TypeError(msg
)
1668 event_class
= EventClass
.__new
__(EventClass
)
1669 event_class
._ec
= event_class_native
1672 def add_event_class(self
, event_class
):
1674 Add an event class to a stream class. New events can be added even after a
1675 stream has been instantiated and events have been appended. However, a stream
1676 will not accept events of a class that has not been added to the stream
1680 if not isinstance(event_class
, EventClass
):
1681 raise TypeError("Invalid event_class type.")
1683 ret
= nbt
._bt
_ctf
_stream
_class
_add
_event
_class
(self
._sc
,
1687 raise ValueError("Could not add event class.")
1690 def packet_context_type(self
):
1692 Get the StreamClass' packet context type (StructureFieldDeclaration)
1695 field_type_native
= nbt
._bt
_ctf
_stream
_class
_get
_packet
_context
_type
(self
._sc
)
1697 if field_type_native
is None:
1698 raise ValueError("Invalid StreamClass")
1700 field_type
= FieldDeclaration
._create
_field
_declaration
_from
_native
_instance
(field_type_native
)
1704 @packet_context_type.setter
1705 def packet_context_type(self
, field_type
):
1707 Set a StreamClass' packet context type. Must be of type
1708 StructureFieldDeclaration.
1711 if not isinstance(field_type
, StructureFieldDeclaration
):
1712 raise TypeError("field_type argument must be of type StructureFieldDeclaration.")
1714 ret
= nbt
._bt
_ctf
_stream
_class
_set
_packet
_context
_type
(self
._sc
,
1718 raise ValueError("Failed to set packet context type.")
1723 raise NotImplementedError("Stream cannot be instantiated; use Writer.create_stream()")
1726 nbt
._bt
_ctf
_stream
_put
(self
._s
)
1729 def discarded_events(self
):
1731 Get a stream's discarded event count.
1734 ret
, count
= nbt
._bt
_ctf
_stream
_get
_discarded
_events
_count
(self
._s
)
1737 raise ValueError("Could not get the stream's discarded events count")
1741 def append_discarded_events(self
, event_count
):
1743 Increase the current packet's discarded event count.
1746 nbt
._bt
_ctf
_stream
_append
_discarded
_events
(self
._s
, event_count
)
1748 def append_event(self
, event
):
1750 Append "event" to the stream's current packet. The stream's associated clock
1751 will be sampled during this call. The event shall not be modified after
1752 being appended to a stream.
1755 ret
= nbt
._bt
_ctf
_stream
_append
_event
(self
._s
, event
._e
)
1758 raise ValueError("Could not append event to stream.")
1761 def packet_context(self
):
1763 Get a Stream's packet context field (a StructureField).
1766 native_field
= nbt
._bt
_ctf
_stream
_get
_packet
_context
(self
._s
)
1768 if native_field
is None:
1769 raise ValueError("Invalid Stream.")
1771 return Field
._create
_field
_from
_native
_instance
(native_field
)
1773 @packet_context.setter
1774 def packet_context(self
, field
):
1776 Set a Stream's packet context field (must be a StructureField).
1779 if not isinstance(field
, StructureField
):
1780 raise TypeError("Argument field must be of type StructureField")
1782 ret
= nbt
._bt
_ctf
_stream
_set
_packet
_context
(self
._s
, field
._f
)
1785 raise ValueError("Invalid packet context field.")
1789 The stream's current packet's events will be flushed to disk. Events
1790 subsequently appended to the stream will be added to a new packet.
1793 ret
= nbt
._bt
_ctf
_stream
_flush
(self
._s
)
1796 raise ValueError("Could not flush stream.")
1800 def __init__(self
, path
):
1802 Create a new writer that will produce a trace in the given path.
1805 self
._w
= nbt
._bt
_ctf
_writer
_create
(path
)
1808 raise ValueError("Writer creation failed.")
1811 nbt
._bt
_ctf
_writer
_put
(self
._w
)
1813 def create_stream(self
, stream_class
):
1815 Create a new stream instance and register it to the writer.
1818 if not isinstance(stream_class
, StreamClass
):
1819 raise TypeError("Invalid stream_class type.")
1821 stream
= Stream
.__new
__(Stream
)
1822 stream
._s
= nbt
._bt
_ctf
_writer
_create
_stream
(self
._w
, stream_class
._sc
)
1826 def add_environment_field(self
, name
, value
):
1828 Add an environment field to the trace.
1831 ret
= nbt
._bt
_ctf
_writer
_add
_environment
_field
(self
._w
, str(name
),
1835 raise ValueError("Could not add environment field to trace.")
1837 def add_clock(self
, clock
):
1839 Add a clock to the trace. Clocks assigned to stream classes must be
1840 registered to the writer.
1843 ret
= nbt
._bt
_ctf
_writer
_add
_clock
(self
._w
, clock
._c
)
1846 raise ValueError("Could not add clock to Writer.")
1851 Get the trace's TSDL meta-data.
1854 return nbt
._bt
_ctf
_writer
_get
_metadata
_string
(self
._w
)
1856 def flush_metadata(self
):
1858 Flush the trace's metadata to the metadata file.
1861 nbt
._bt
_ctf
_writer
_flush
_metadata
(self
._w
)
1864 def byte_order(self
):
1866 Get the trace's byte order. Must be a constant from the ByteOrder
1870 raise NotImplementedError("Getter not implemented.")
1873 def byte_order(self
, byte_order
):
1875 Set the trace's byte order. Must be a constant from the ByteOrder
1876 class. Defaults to the host machine's endianness
1879 ret
= nbt
._bt
_ctf
_writer
_set
_byte
_order
(self
._w
, byte_order
)
1882 raise ValueError("Could not set trace's byte order.")