xref: /btstack/tool/btstack_event_generator.py (revision 8850b501b63dea7e8e09e0ce7dbe8933ed05ea0e) 
1#!/usr/bin/env python3
2
3import glob
4import re
5import sys
6import os
7
8import btstack_parser as parser
9
10meta_events = [
11    'A2DP',
12    'ANCS',
13    'AVDTP',
14    'AVRCP',
15    'GAP',
16    'GATTSERVICE',
17    'GOEP',
18    'HFP',
19    'HID',
20    'HIDS',
21    'HSP',
22    'LE',
23    'LEAUDIO',
24    'MAP',
25    'MESH',
26    'PBAP',
27    'OPP'
28]
29
30supported_event_groups = meta_events + [
31    'ATT',
32    'BNEP',
33    'BTSTACK',
34    'GAP',
35    'GATT',
36    'HCI',
37    'HID',
38    'L2CAP',
39    'RFCOMM',
40    'SDP',
41    'SM',
42    'DAEMON',
43]
44
45open_bracket = parser.open_bracket
46closing_bracket = parser.closing_bracket
47
48program_info = '''
49BTstack Event Getter Generator for BTstack
50Copyright 2016, BlueKitchen GmbH
51'''
52
53copyright = """/*
54 * Copyright (C) 2016 BlueKitchen GmbH
55 *
56 * Redistribution and use in source and binary forms, with or without
57 * modification, are permitted provided that the following conditions
58 * are met:
59 *
60 * 1. Redistributions of source code must retain the above copyright
61 *    notice, this list of conditions and the following disclaimer.
62 * 2. Redistributions in binary form must reproduce the above copyright
63 *    notice, this list of conditions and the following disclaimer in the
64 *    documentation and/or other materials provided with the distribution.
65 * 3. Neither the name of the copyright holders nor the names of
66 *    contributors may be used to endorse or promote products derived
67 *    from this software without specific prior written permission.
68 * 4. Any redistribution, use, or modification is done solely for
69 *    personal benefit and not for any commercial purpose or for
70 *    monetary gain.
71 *
72 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
73 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
74 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
75 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
76 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
77 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
78 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
79 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
80 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
81 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
82 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
83 * SUCH DAMAGE.
84 *
85 * Please inquire about commercial licensing options at
86 * [email protected]
87 *
88 */
89"""
90
91hfile_header_begin = """
92
93/**
94 * HCI Event Getter
95 *
96 * Note: Don't edit this file. It is generated by tool/btstack_event_generator.py
97 *
98 */
99
100#ifndef BTSTACK_EVENT_H
101#define BTSTACK_EVENT_H
102
103#if defined __cplusplus
104extern "C" {
105#endif
106
107#include "btstack_util.h"
108#include <stdint.h>
109
110#ifdef ENABLE_BLE
111#include "ble/gatt_client.h"
112#endif
113
114/* API_START */
115
116/**
117 * @brief Get event type
118 * @param event
119 * @return type of event
120 */
121static inline uint8_t hci_event_packet_get_type(const uint8_t * event){
122    return event[0];
123}
124
125typedef uint8_t* btstack_event_iterator_t;
126
127"""
128
129hfile_header_end = """
130
131/* API_END */
132
133#if defined __cplusplus
134}
135#endif
136
137#endif // BTSTACK_EVENT_H
138"""
139
140c_prototoype_simple_return = '''/**
141 * @brief {description}
142 * @param event packet
143 * @return {result_name}
144 * @note: btstack_type {format}
145 */
146static inline {result_type} {event}_get_{field}(const uint8_t * event){{
147    {code}
148}}
149'''
150
151c_prototype_iterator_return = '''/**
152 * @brief {description}
153 * @param event packet
154 * @return {result_name}
155 * @note: btstack_type {format}
156 */
157static inline {result_type} {event}_get_{scope}_item_{field}(btstack_event_iterator_t * iter){{
158    {code}
159}}
160'''
161
162c_prototype_iterator_init = '''/**
163 * @brief Initialize iterator for list {scope} of {event}
164 * @param iterator
165 * @param event packet
166 * @note: btstack_type {format}
167 */
168static inline void {event}_{field}_init(btstack_event_iterator_t * iter, const uint8_t * event){{
169    *iter = (btstack_event_iterator_t)&event[{list_field}];
170}}
171
172'''
173
174c_prototype_iterator_has_next = '''/**
175 * @brief Returns true if iterator of list {scope} of {event} has more elements, false otherwise.
176 * @param iterator
177 * @param event packet
178 * @return
179 * @note: btstack_type {format}
180 */
181static inline bool {event}_{field}_has_next(btstack_event_iterator_t * iter, const uint8_t * event){{
182    uint8_t length = event[{length_field}];
183    const uint8_t *begin = &event[{list_field}];
184    const uint8_t *end = begin+length;
185    return *iter<end;
186}}
187
188'''
189
190c_prototype_iterator_next = '''/**
191 * @brief Advances the iterator to the next element
192 * @param event packet
193 * @note: btstack_type {format}
194 */
195static inline void {event}_{scope}_next(btstack_event_iterator_t * iter){{
196    uint8_t length = {code}
197    *iter = *iter+length;
198}}
199
200'''
201
202c_prototoype_array_getter = '''/**
203 * @brief {description}
204 * @param event packet
205 * @param index
206 * @return {result_name}
207 * @note: btstack_type {format}
208 */
209static inline {result_type} {event}_get_{field}(const uint8_t * event, uint8_t index){{
210    {code}
211}}
212'''
213
214c_prototoype_struct_return = '''/**
215 * @brief {description}
216 * @param event packet
217 * @param Pointer to storage for {result_name}
218 * @note: btstack_type {format}
219 */
220static inline void {event}_get_{field}(const uint8_t * event, {result_type} {result_name}){{
221    {code}
222}}
223'''
224
225c_prototoype_unsupported = '''/**
226 * @brief {description}
227 * @param event packet
228 * @return {result_name}
229 * @note: btstack_type {format}
230 */
231//  static inline {result_type} {event}_get_{field}(const uint8_t * event){{
232//      not implemented yet
233//  }}
234'''
235
236meta_event_template = '''/***
237 * @brief Get subevent code for {meta_event} event
238 * @param event packet
239 * @return subevent_code
240 */
241static inline uint8_t hci_event_{meta_event}_meta_get_subevent_code(const uint8_t * event){{
242    return event[2];
243}}
244'''
245
246
247# global variables/defines
248defines = dict()
249defines_used = set()
250
251param_read = {
252    '1' : 'return event[{offset}];',
253    'J' : 'return event[{offset}];',
254    '2' : 'return little_endian_read_16(event, {offset});',
255    'L' : 'return little_endian_read_16(event, {offset});',
256    '3' : 'return little_endian_read_24(event, {offset});',
257    '4' : 'return little_endian_read_32(event, {offset});',
258    'H' : 'return little_endian_read_16(event, {offset});',
259    'B' : 'reverse_bytes(&event[{offset}], {result_name}, 6);',
260    'R' : 'return &event[{offset}];',
261    'N' : 'return (const char *) &event[{offset}];',
262    'P' : 'return (const uint8_t *) &event[{offset}];',
263    'T' : 'return (const char *) &event[{offset}];',
264    'D' : 'return (const uint8_t *) &event[{offset}];',
265    'K' : 'reverse_bytes(&event[{offset}], {result_name}, 16);',
266    'Q' : 'reverse_bytes(&event[{offset}], {result_name}, 32);',
267    'V' : 'return &event[{offset}];',
268    'X' : 'gatt_client_deserialize_service(event, {offset}, {result_name});',
269    'Y' : 'gatt_client_deserialize_characteristic(event, {offset}, {result_name});',
270    'Z' : 'gatt_client_deserialize_characteristic_descriptor(event, {offset}, {result_name});',
271    'V' : 'return &event[{offset}];',
272    'C' : 'return little_endian_read_16(event, {offset} + (2 * (int) index));',
273    open_bracket    : 'dummy',
274    closing_bracket : 'dummy',
275}
276
277param_iterator_read = {
278    '1' : 'return (*iter)[{offset}];',
279    '2' : 'return little_endian_read_16(*iter, {offset});',
280    'J' : 'return (*iter)[{offset}] + 1;',
281    'V' : 'return &((*iter)[{offset}]);',
282    open_bracket    : '*iter = &event[{offset}];',
283    closing_bracket : ''
284}
285
286listScope = list()
287
288def read_template_for_type(type):
289    if listScope:
290        return param_iterator_read[type]
291    return param_read[type]
292
293def description_for_type(type):
294    if type == 'C':
295        return 'Get element of array field {0} from event {1}'
296    if listScope:
297        return 'Get element of list field {0} from event {1}'
298    return 'Get field {0} from event {1}'
299
300def c_type_for_btstack_type(type):
301    param_types = { '1' : 'uint8_t', '2' : 'uint16_t', '3' : 'uint32_t', '4' : 'uint32_t', 'H' : 'hci_con_handle_t', 'B' : 'bd_addr_t',
302                    'D' : 'const uint8_t *', 'E' : 'const uint8_t * ', 'N' : 'const char *' , 'P' : 'const uint8_t *', 'A' : 'const uint8_t *',
303                    'R' : 'const uint8_t *', 'S' : 'const uint8_t *',
304                    'J' : 'uint8_t', 'L' : 'uint16_t', 'V' : 'const uint8_t *', 'U' : 'BT_UUID',
305                    'Q' : 'uint8_t *', 'K' : 'uint8_t *',
306                    'X' : 'gatt_client_service_t *', 'Y' : 'gatt_client_characteristic_t *', 'Z' : 'gatt_client_characteristic_descriptor_t *',
307                    'T' : 'const char *', 'C' : 'uint16_t',
308                    open_bracket : 'void', closing_bracket : ''}
309    return param_types[type]
310
311def size_for_type(type):
312    param_sizes = { '1' : 1, '2' : 2, '3' : 3, '4' : 4, 'H' : 2, 'B' : 6, 'D' : 8, 'E' : 240, 'N' : 248, 'P' : 16, 'Q':32, 'K':16,
313                    'A' : 31, 'S' : -1, 'V': -1, 'J' : 1, 'L' : 2, 'U' : 16, 'X' : 20, 'Y' : 24, 'Z' : 18, 'T':-1, 'C':-1,
314                   open_bracket : 0, closing_bracket : 0 }
315    return param_sizes[type]
316
317def format_function_name(event_name):
318    event_name = event_name.lower()
319    if 'event' in event_name:
320        return event_name;
321    return event_name+'_event'
322
323def template_for_type(field_type):
324    global c_prototoype_simple_return
325    global c_prototoype_struct_return
326    global c_prototoype_array_getter
327    if field_type == 'C':
328        return c_prototoype_array_getter
329#    if field_type == open_bracket:
330#        return c_prototype_iterator_init
331    types_with_struct_return = "BKQXYZ"
332    if field_type in types_with_struct_return:
333        return c_prototoype_struct_return
334    if listScope:
335        return c_prototype_iterator_return;
336    return c_prototoype_simple_return
337
338def all_fields_supported(format):
339    global param_read
340    for f in format:
341        if not f in param_read:
342            return False
343    return True
344
345def create_iterator( event_name, field_name, field_type, offset, offset_is_number, last_length_field_offset, supported):
346    if field_type == open_bracket:
347        # list field name, list field start, length field of list ( in bytes ), list elemet size if static
348        listScope.append( (field_name, offset, last_length_field_offset, 0) )
349    list_name_scope = ''
350    list_base = 0
351    if listScope:
352        list_name_scope = listScope[-1][0]
353        list_base = listScope[-1][1]
354        list_length_field_offset = listScope[-1][2]
355        list_static_size = listScope[-1][3]
356
357    generated = ''
358    if field_type == open_bracket:
359        generated_init = c_prototype_iterator_init.format( list_field=offset, scope=list_name_scope,
360                                                          event=event_name, field=field_name, format=field_type)
361        generated_has_next = c_prototype_iterator_has_next.format( list_field=offset, length_field=last_length_field_offset,
362                                                                  format=field_type, scope=list_name_scope, event=event_name,
363                                                                  field=field_name )
364        generated = generated_init + generated_has_next;
365    else:
366        # the item length is either determiend statically, format "12"
367        # or dynamically by an list element, format "J"
368        code = ''
369        if list_length_field_offset < last_length_field_offset:
370            #dynamic element size
371            code = '*iter[{0}] + 1;'.format( last_length_field_offset-list_base )
372        else:
373            code = '{0};'.format( list_static_size )
374        generated = c_prototype_iterator_next.format( event=event_name, scope=list_name_scope, format=field_type, code=code );
375
376    if field_type == closing_bracket:
377        listScope.pop()
378    return generated
379
380def create_getter(event_name, field_name, field_type, offset, offset_is_number, last_length_field_offset, supported):
381    global c_prototoype_unsupported
382    global param_read
383
384    description_template = description_for_type(field_type)
385    list_name_scope = ''
386    if listScope:
387        list_name_scope = listScope[-1][0]
388        list_base = listScope[-1][1]
389        list_length_field_offset = listScope[-1][2]
390        list_static_size = listScope[-1][3]
391        if offset_is_number:
392            offset = offset - list_base;
393        listScope[-1] = (list_name_scope, list_base, list_length_field_offset, list_static_size+size_for_type(field_type))
394    description = description_template.format(field_name, event_name.upper())
395    result_name = field_name
396    result_type = c_type_for_btstack_type(field_type)
397    template = c_prototoype_unsupported
398    code = ''
399    if supported and field_type in param_read:
400        template = template_for_type(field_type)
401        read_code = read_template_for_type(field_type)
402        requires_signed = 'little_endian' in read_code or 'gatt_client_deserialize' in read_code
403        code = ''
404        if requires_signed and not offset_is_number:
405            code += 'uint8_t offset = %s;\n    ' % offset
406            offset = '(int)(int8_t) offset'
407        code += read_code.format(offset=offset, result_name=result_name)
408    return template.format(description=description, scope=list_name_scope, event=event_name, field=field_name, result_name=result_name, result_type=result_type, code=code, format=field_type)
409
410def is_le_event(event_group):
411    return event_group in ['GATT', 'ANCS', 'SM']
412
413def create_events(events):
414    global gen_path
415    global copyright
416    global hfile_header_begin
417    global hfile_header_end
418    global meta_event_template
419
420    with open(gen_path, 'wt') as fout:
421        fout.write(copyright)
422        fout.write(hfile_header_begin)
423
424        for meta_event in meta_events:
425            fout.write(meta_event_template.format(meta_event=meta_event.lower()))
426
427        for event_type, event_name, format, args in events:
428            parts = event_name.split("_")
429            event_group = parts[0]
430            if not event_group in supported_event_groups:
431                print("// %s " % event_name)
432                continue
433            # print(event_name)
434            base_name = format_function_name(event_name)
435            length_name = ''
436            offset = 2
437            offset_is_number = 1
438            offset_unknown = 0
439            supported = all_fields_supported(format)
440            last_variable_length_field_pos = ""
441            last_length_field_offset = 0
442            if is_le_event(event_group):
443                fout.write("#ifdef ENABLE_BLE\n")
444            if len(format) != len(args):
445                print(event_name.upper())
446                print ("Format %s does not match params %s " % (format, args))
447                print
448            for f, arg in zip(format, args):
449                field_name = arg
450                if field_name.lower() == 'subevent_code':
451                    offset += 1
452                    continue
453                if offset_unknown:
454                    print("Param after variable length field without preceding 'J' length field")
455                    break
456                field_type = f
457                if field_type in open_bracket + closing_bracket:
458                    text = create_iterator( base_name, field_name, field_type, offset, offset_is_number, last_length_field_offset, supported )
459                else:
460                    text = create_getter(base_name, field_name, field_type, offset, offset_is_number, last_length_field_offset, supported)
461                fout.write(text)
462                if field_type in 'RT':
463                    break
464                if field_type in 'J':
465                    if offset_is_number:
466                        last_length_field_offset = offset
467                        last_variable_length_field_pos = '%u' % offset
468                    else:
469                        last_variable_length_field_pos = offset
470                if field_type in 'V':
471                    if last_variable_length_field_pos != '':
472                        if offset_is_number:
473                            # convert to string
474                            offset = '%uu' % offset
475                            offset_is_number = 0
476                        offset = offset + ' + event[%s]' % last_variable_length_field_pos
477                    else:
478                        offset_unknown = 1
479                else:
480                    if offset_is_number:
481                        offset += size_for_type(field_type)
482                    else:
483                        offset = offset + ' + %uu' % size_for_type(field_type)
484            if is_le_event(event_group):
485                fout.write("#endif\n")
486            fout.write("\n")
487
488        fout.write(hfile_header_end)
489
490btstack_root = os.path.abspath(os.path.dirname(sys.argv[0]) + '/..')
491gen_path = btstack_root + '/src/btstack_event.h'
492
493print(program_info)
494
495# parse events
496(events, le_events, event_types) = parser.parse_events()
497# create event field accesors
498create_events(events + le_events)
499
500# done
501print('Done!')
502