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99eaa206 PA |
1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
0157808d | 4 | * Copyright (C) 2012 Petteri Aimonen <jpa@sr.mail.kapsi.fi> |
99eaa206 PA |
5 | * |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
0157808d PA |
20 | /* The VCD input module has the following options: |
21 | * | |
22 | * numprobes: Maximum number of probes to use. The probes are | |
23 | * detected in the same order as they are listed | |
24 | * in the $var sections of the VCD file. | |
25 | * | |
26 | * skip: Allows skipping until given timestamp in the file. | |
27 | * This can speed up analyzing of long captures. | |
28 | * | |
29 | * Value < 0: Skip until first timestamp listed in | |
30 | * the file. (default) | |
31 | * | |
32 | * Value = 0: Do not skip, instead generate samples | |
33 | * beginning from timestamp 0. | |
34 | * | |
35 | * Value > 0: Start at the given timestamp. | |
36 | * | |
37 | * downsample: Divide the samplerate by the given factor. | |
38 | * This can speed up analyzing of long captures. | |
39 | * | |
6b7ace48 PA |
40 | * compress: Compress idle periods longer than this value. |
41 | * This can speed up analyzing of long captures. | |
42 | * Default 0 = don't compress. | |
43 | * | |
0157808d PA |
44 | * Based on Verilog standard IEEE Std 1364-2001 Version C |
45 | * | |
46 | * Supported features: | |
47 | * - $var with 'wire' and 'reg' types of scalar variables | |
48 | * - $timescale definition for samplerate | |
49 | * - multiple character variable identifiers | |
50 | * | |
51 | * Most important unsupported features: | |
52 | * - vector variables (bit vectors etc.) | |
53 | * - analog, integer and real number variables | |
54 | * - $dumpvars initial value declaration | |
8be87469 | 55 | * - $scope namespaces |
0157808d PA |
56 | */ |
57 | ||
58 | /* */ | |
99eaa206 PA |
59 | |
60 | #include <stdlib.h> | |
61 | #include <glib.h> | |
62 | #include <stdio.h> | |
61a429c9 | 63 | #include <string.h> |
99eaa206 PA |
64 | #include "libsigrok.h" |
65 | #include "libsigrok-internal.h" | |
66 | ||
67 | /* Message logging helpers with driver-specific prefix string. */ | |
68 | #define DRIVER_LOG_DOMAIN "input/vcd: " | |
69 | #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args) | |
70 | #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args) | |
71 | #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args) | |
72 | #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args) | |
73 | #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args) | |
74 | #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args) | |
75 | ||
76 | #define DEFAULT_NUM_PROBES 8 | |
77 | ||
78 | /* Read until specific type of character occurs in file. | |
79 | * Skip input if dest is NULL. | |
80 | * Modes: | |
81 | * 'W' read until whitespace | |
82 | * 'N' read until non-whitespace, and ungetc() the character | |
83 | * '$' read until $end | |
84 | */ | |
85 | static gboolean read_until(FILE *file, GString *dest, char mode) | |
86 | { | |
87 | char prev[4] = ""; | |
8be87469 | 88 | long startpos = ftell(file); |
99eaa206 PA |
89 | for(;;) |
90 | { | |
91 | int c = fgetc(file); | |
92 | ||
93 | if (c == EOF) | |
94 | { | |
8be87469 PA |
95 | if (mode == '$') |
96 | sr_err("Unexpected EOF, read started at %ld.", startpos); | |
99eaa206 PA |
97 | return FALSE; |
98 | } | |
99 | ||
100 | if (mode == 'W' && g_ascii_isspace(c)) | |
101 | return TRUE; | |
102 | ||
103 | if (mode == 'N' && !g_ascii_isspace(c)) | |
104 | { | |
105 | ungetc(c, file); | |
106 | return TRUE; | |
107 | } | |
108 | ||
109 | if (mode == '$') | |
110 | { | |
111 | prev[0] = prev[1]; prev[1] = prev[2]; prev[2] = prev[3]; prev[3] = c; | |
112 | if (prev[0] == '$' && prev[1] == 'e' && prev[2] == 'n' && prev[3] == 'd') | |
113 | { | |
114 | if (dest != NULL) | |
115 | g_string_truncate(dest, dest->len - 3); | |
116 | ||
117 | return TRUE; | |
118 | } | |
119 | } | |
120 | ||
121 | if (dest != NULL) | |
122 | g_string_append_c(dest, c); | |
123 | } | |
124 | } | |
125 | ||
126 | /* Reads a single VCD section from input file and parses it to structure. | |
127 | * e.g. $timescale 1ps $end => "timescale" "1ps" | |
128 | */ | |
129 | static gboolean parse_section(FILE *file, gchar **name, gchar **contents) | |
130 | { | |
131 | gboolean status; | |
132 | GString *sname, *scontents; | |
133 | ||
134 | /* Skip any initial white-space */ | |
135 | if (!read_until(file, NULL, 'N')) return FALSE; | |
136 | ||
137 | /* Section tag should start with $. */ | |
138 | if (fgetc(file) != '$') | |
139 | { | |
140 | sr_err("Expected $ at beginning of section."); | |
141 | return FALSE; | |
142 | } | |
143 | ||
144 | /* Read the section tag */ | |
145 | sname = g_string_sized_new(32); | |
146 | status = read_until(file, sname, 'W'); | |
147 | ||
148 | /* Skip whitespace before content */ | |
149 | status = status && read_until(file, NULL, 'N'); | |
150 | ||
151 | /* Read the content */ | |
152 | scontents = g_string_sized_new(128); | |
153 | status = status && read_until(file, scontents, '$'); | |
154 | g_strchomp(scontents->str); | |
155 | ||
156 | /* Release strings if status is FALSE, return them if status is TRUE */ | |
157 | *name = g_string_free(sname, !status); | |
158 | *contents = g_string_free(scontents, !status); | |
159 | return status; | |
160 | } | |
161 | ||
162 | struct probe | |
163 | { | |
164 | gchar *name; | |
165 | gchar *identifier; | |
166 | }; | |
167 | ||
168 | struct context | |
169 | { | |
170 | uint64_t samplerate; | |
171 | int maxprobes; | |
172 | int probecount; | |
0157808d | 173 | int downsample; |
6b7ace48 | 174 | unsigned compress; |
0157808d | 175 | int64_t skip; |
99eaa206 PA |
176 | struct probe probes[SR_MAX_NUM_PROBES]; |
177 | }; | |
178 | ||
61a429c9 PA |
179 | static void release_context(struct context *ctx) |
180 | { | |
181 | int i; | |
182 | for (i = 0; i < ctx->probecount; i++) | |
183 | { | |
184 | g_free(ctx->probes[i].name); ctx->probes[i].name = NULL; | |
185 | g_free(ctx->probes[i].identifier); ctx->probes[i].identifier = NULL; | |
186 | } | |
187 | ||
188 | g_free(ctx); | |
189 | } | |
190 | ||
99eaa206 PA |
191 | /* Remove empty parts from an array returned by g_strsplit. */ |
192 | static void remove_empty_parts(gchar **parts) | |
193 | { | |
194 | gchar **src = parts; | |
195 | gchar **dest = parts; | |
196 | while (*src != NULL) | |
197 | { | |
198 | if (**src != '\0') | |
199 | { | |
200 | *dest++ = *src; | |
201 | } | |
202 | ||
203 | src++; | |
204 | } | |
205 | ||
206 | *dest = NULL; | |
207 | } | |
208 | ||
209 | /* Parse VCD header to get values for context structure. | |
210 | * The context structure should be zeroed before calling this. | |
211 | */ | |
212 | static gboolean parse_header(FILE *file, struct context *ctx) | |
213 | { | |
214 | gchar *name = NULL, *contents = NULL; | |
215 | gboolean status = FALSE; | |
216 | ||
217 | while (parse_section(file, &name, &contents)) | |
218 | { | |
219 | sr_dbg("Section '%s', contents '%s'.", name, contents); | |
220 | ||
221 | if (g_strcmp0(name, "enddefinitions") == 0) | |
222 | { | |
223 | status = TRUE; | |
224 | break; | |
225 | } | |
226 | else if (g_strcmp0(name, "timescale") == 0) | |
227 | { | |
228 | /* The standard allows for values 1, 10 or 100 | |
229 | * and units s, ms, us, ns, ps and fs. */ | |
230 | struct sr_rational period; | |
231 | if (sr_parse_period(contents, &period) == SR_OK) | |
232 | { | |
233 | ctx->samplerate = period.q / period.p; | |
234 | if (period.q % period.p != 0) | |
235 | { | |
236 | /* Does not happen unless time value is non-standard */ | |
0157808d | 237 | sr_warn("Inexact rounding of samplerate, %" PRIu64 " / %" PRIu64 " to %" PRIu64 " Hz.", |
99eaa206 PA |
238 | period.q, period.p, ctx->samplerate); |
239 | } | |
240 | ||
241 | sr_dbg("Samplerate: %" PRIu64, ctx->samplerate); | |
242 | } | |
243 | else | |
244 | { | |
245 | sr_err("Parsing timescale failed."); | |
246 | } | |
247 | } | |
248 | else if (g_strcmp0(name, "var") == 0) | |
249 | { | |
250 | /* Format: $var type size identifier reference $end */ | |
251 | gchar **parts = g_strsplit_set(contents, " \r\n\t", 0); | |
252 | remove_empty_parts(parts); | |
253 | ||
254 | if (g_strv_length(parts) != 4) | |
255 | { | |
8be87469 | 256 | sr_warn("$var section should have 4 items"); |
99eaa206 PA |
257 | } |
258 | else if (g_strcmp0(parts[0], "reg") != 0 && g_strcmp0(parts[0], "wire") != 0) | |
259 | { | |
8be87469 | 260 | sr_info("Unsupported signal type: '%s'", parts[0]); |
99eaa206 PA |
261 | } |
262 | else if (strtol(parts[1], NULL, 10) != 1) | |
263 | { | |
8be87469 | 264 | sr_info("Unsupported signal size: '%s'", parts[1]); |
99eaa206 PA |
265 | } |
266 | else if (ctx->probecount >= ctx->maxprobes) | |
267 | { | |
268 | sr_warn("Skipping '%s' because only %d probes requested.", parts[3], ctx->maxprobes); | |
269 | } | |
270 | else | |
271 | { | |
272 | sr_info("Probe %d is '%s' identified by '%s'.", ctx->probecount, parts[3], parts[2]); | |
273 | ctx->probes[ctx->probecount].identifier = g_strdup(parts[2]); | |
274 | ctx->probes[ctx->probecount].name = g_strdup(parts[3]); | |
275 | ctx->probecount++; | |
276 | } | |
277 | ||
278 | g_strfreev(parts); | |
279 | } | |
280 | ||
281 | g_free(name); name = NULL; | |
282 | g_free(contents); contents = NULL; | |
283 | } | |
284 | ||
285 | g_free(name); | |
286 | g_free(contents); | |
287 | ||
288 | return status; | |
289 | } | |
290 | ||
291 | static int format_match(const char *filename) | |
292 | { | |
293 | FILE *file; | |
294 | gchar *name = NULL, *contents = NULL; | |
295 | gboolean status; | |
296 | ||
297 | file = fopen(filename, "r"); | |
298 | if (file == NULL) | |
299 | return FALSE; | |
300 | ||
301 | /* If we can parse the first section correctly, | |
302 | * then it is assumed to be a VCD file. | |
303 | */ | |
304 | status = parse_section(file, &name, &contents); | |
305 | status = status && (*name != '\0'); | |
306 | ||
307 | g_free(name); | |
308 | g_free(contents); | |
309 | fclose(file); | |
310 | ||
311 | return status; | |
312 | } | |
313 | ||
314 | static int init(struct sr_input *in) | |
315 | { | |
316 | struct sr_probe *probe; | |
317 | int num_probes, i; | |
318 | char name[SR_MAX_PROBENAME_LEN + 1]; | |
319 | char *param; | |
320 | struct context *ctx; | |
321 | ||
322 | if (!(ctx = g_try_malloc0(sizeof(*ctx)))) { | |
323 | sr_err("Input format context malloc failed."); | |
324 | return SR_ERR_MALLOC; | |
325 | } | |
326 | ||
327 | num_probes = DEFAULT_NUM_PROBES; | |
328 | ctx->samplerate = 0; | |
0157808d PA |
329 | ctx->downsample = 1; |
330 | ctx->skip = -1; | |
99eaa206 PA |
331 | |
332 | if (in->param) { | |
333 | param = g_hash_table_lookup(in->param, "numprobes"); | |
334 | if (param) { | |
335 | num_probes = strtoul(param, NULL, 10); | |
336 | if (num_probes < 1) | |
61a429c9 PA |
337 | { |
338 | release_context(ctx); | |
99eaa206 | 339 | return SR_ERR; |
61a429c9 | 340 | } |
99eaa206 | 341 | } |
0157808d PA |
342 | |
343 | param = g_hash_table_lookup(in->param, "downsample"); | |
344 | if (param) { | |
345 | ctx->downsample = strtoul(param, NULL, 10); | |
346 | if (ctx->downsample < 1) | |
347 | { | |
348 | ctx->downsample = 1; | |
349 | } | |
350 | } | |
351 | ||
6b7ace48 PA |
352 | param = g_hash_table_lookup(in->param, "compress"); |
353 | if (param) { | |
354 | ctx->compress = strtoul(param, NULL, 10); | |
355 | } | |
356 | ||
0157808d PA |
357 | param = g_hash_table_lookup(in->param, "skip"); |
358 | if (param) { | |
359 | ctx->skip = strtoul(param, NULL, 10) / ctx->downsample; | |
360 | } | |
99eaa206 PA |
361 | } |
362 | ||
363 | /* Maximum number of probes to parse from the VCD */ | |
364 | ctx->maxprobes = num_probes; | |
365 | ||
366 | /* Create a virtual device. */ | |
367 | in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL); | |
368 | in->internal = ctx; | |
369 | ||
370 | for (i = 0; i < num_probes; i++) { | |
371 | snprintf(name, SR_MAX_PROBENAME_LEN, "%d", i); | |
372 | ||
373 | if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE, name))) | |
61a429c9 PA |
374 | { |
375 | release_context(ctx); | |
99eaa206 | 376 | return SR_ERR; |
61a429c9 PA |
377 | } |
378 | ||
99eaa206 PA |
379 | in->sdi->probes = g_slist_append(in->sdi->probes, probe); |
380 | } | |
381 | ||
382 | return SR_OK; | |
383 | } | |
384 | ||
61a429c9 PA |
385 | #define CHUNKSIZE 1024 |
386 | ||
387 | /* Send N samples of the given value. */ | |
388 | static void send_samples(const struct sr_dev_inst *sdi, uint64_t sample, uint64_t count) | |
389 | { | |
390 | struct sr_datafeed_packet packet; | |
391 | struct sr_datafeed_logic logic; | |
392 | uint64_t buffer[CHUNKSIZE]; | |
393 | uint64_t i; | |
394 | unsigned chunksize = CHUNKSIZE; | |
0157808d | 395 | |
61a429c9 PA |
396 | if (count < chunksize) |
397 | chunksize = count; | |
398 | ||
399 | for (i = 0; i < chunksize; i++) | |
400 | { | |
401 | buffer[i] = sample; | |
402 | } | |
403 | ||
404 | packet.type = SR_DF_LOGIC; | |
405 | packet.payload = &logic; | |
406 | logic.unitsize = sizeof(uint64_t); | |
407 | logic.data = buffer; | |
408 | ||
409 | while (count) | |
410 | { | |
411 | if (count < chunksize) | |
412 | chunksize = count; | |
413 | ||
414 | logic.length = sizeof(uint64_t) * chunksize; | |
415 | ||
416 | sr_session_send(sdi, &packet); | |
417 | count -= chunksize; | |
418 | } | |
419 | } | |
420 | ||
421 | /* Parse the data section of VCD */ | |
422 | static void parse_contents(FILE *file, const struct sr_dev_inst *sdi, struct context *ctx) | |
423 | { | |
424 | GString *token = g_string_sized_new(32); | |
425 | ||
61a429c9 PA |
426 | uint64_t prev_timestamp = 0; |
427 | uint64_t prev_values = 0; | |
428 | ||
429 | /* Read one space-delimited token at a time. */ | |
430 | while (read_until(file, NULL, 'N') && read_until(file, token, 'W')) | |
431 | { | |
432 | if (token->str[0] == '#' && g_ascii_isdigit(token->str[1])) | |
433 | { | |
434 | /* Numeric value beginning with # is a new timestamp value */ | |
435 | uint64_t timestamp; | |
436 | timestamp = strtoull(token->str + 1, NULL, 10); | |
437 | ||
0157808d PA |
438 | if (ctx->downsample > 1) |
439 | timestamp /= ctx->downsample; | |
440 | ||
441 | /* Skip < 0 => skip until first timestamp. | |
442 | * Skip = 0 => don't skip | |
443 | * Skip > 0 => skip until timestamp >= skip. | |
444 | */ | |
445 | if (ctx->skip < 0) | |
446 | { | |
447 | ctx->skip = timestamp; | |
8be87469 | 448 | prev_timestamp = timestamp; |
0157808d PA |
449 | } |
450 | else if (ctx->skip > 0 && timestamp < (uint64_t)ctx->skip) | |
61a429c9 | 451 | { |
8be87469 | 452 | prev_timestamp = ctx->skip; |
0157808d PA |
453 | } |
454 | else if (timestamp == prev_timestamp) | |
455 | { | |
8be87469 | 456 | /* Ignore repeated timestamps (e.g. sigrok outputs these) */ |
61a429c9 PA |
457 | } |
458 | else | |
459 | { | |
6b7ace48 PA |
460 | if (ctx->compress != 0 && timestamp - prev_timestamp > ctx->compress) |
461 | { | |
462 | /* Compress long idle periods */ | |
463 | prev_timestamp = timestamp - ctx->compress; | |
464 | } | |
465 | ||
61a429c9 PA |
466 | sr_dbg("New timestamp: %" PRIu64, timestamp); |
467 | ||
468 | /* Generate samples from prev_timestamp up to timestamp - 1. */ | |
8be87469 | 469 | send_samples(sdi, prev_values, timestamp - prev_timestamp); |
0157808d | 470 | prev_timestamp = timestamp; |
61a429c9 | 471 | } |
61a429c9 | 472 | } |
8be87469 | 473 | else if (token->str[0] == '$' && token->len > 1) |
61a429c9 PA |
474 | { |
475 | /* This is probably a $dumpvars, $comment or similar. | |
8be87469 PA |
476 | * $dump* contain useful data, but other tags will be skipped until $end. */ |
477 | if (g_strcmp0(token->str, "$dumpvars") == 0 || | |
478 | g_strcmp0(token->str, "$dumpon") == 0 || | |
479 | g_strcmp0(token->str, "$dumpoff") == 0 || | |
480 | g_strcmp0(token->str, "$end") == 0) | |
481 | { | |
482 | /* Ignore, parse contents as normally. */ | |
483 | } | |
484 | else | |
485 | { | |
486 | /* Skip until $end */ | |
487 | read_until(file, NULL, '$'); | |
488 | } | |
489 | } | |
490 | else if (strchr("bBrR", token->str[0]) != NULL) | |
491 | { | |
492 | /* A vector value. Skip it and also the following identifier. */ | |
493 | read_until(file, NULL, 'N'); | |
494 | read_until(file, NULL, 'W'); | |
61a429c9 PA |
495 | } |
496 | else if (strchr("01xXzZ", token->str[0]) != NULL) | |
497 | { | |
498 | /* A new 1-bit sample value */ | |
499 | int i, bit; | |
500 | bit = (token->str[0] == '1'); | |
501 | ||
502 | g_string_erase(token, 0, 1); | |
503 | if (token->len == 0) | |
504 | { | |
505 | /* There was a space between value and identifier. | |
506 | * Read in the rest. | |
507 | */ | |
508 | read_until(file, NULL, 'N'); | |
509 | read_until(file, token, 'W'); | |
510 | } | |
511 | ||
512 | for (i = 0; i < ctx->probecount; i++) | |
513 | { | |
514 | if (g_strcmp0(token->str, ctx->probes[i].identifier) == 0) | |
515 | { | |
516 | sr_dbg("Probe %d new value %d.", i, bit); | |
517 | ||
518 | /* Found our probe */ | |
519 | if (bit) | |
8be87469 | 520 | prev_values |= (1 << i); |
61a429c9 | 521 | else |
8be87469 | 522 | prev_values &= ~(1 << i); |
61a429c9 PA |
523 | |
524 | break; | |
525 | } | |
526 | } | |
527 | ||
528 | if (i == ctx->probecount) | |
529 | { | |
8be87469 | 530 | sr_dbg("Did not find probe for identifier '%s'.", token->str); |
61a429c9 PA |
531 | } |
532 | } | |
8be87469 PA |
533 | else |
534 | { | |
535 | sr_warn("Skipping unknown token '%s'.", token->str); | |
536 | } | |
61a429c9 PA |
537 | |
538 | g_string_truncate(token, 0); | |
539 | } | |
540 | ||
541 | g_string_free(token, TRUE); | |
542 | } | |
543 | ||
99eaa206 PA |
544 | static int loadfile(struct sr_input *in, const char *filename) |
545 | { | |
546 | struct sr_datafeed_header header; | |
547 | struct sr_datafeed_packet packet; | |
548 | struct sr_datafeed_meta_logic meta; | |
99eaa206 PA |
549 | FILE *file; |
550 | struct context *ctx; | |
551 | ||
552 | ctx = in->internal; | |
553 | ||
554 | if ((file = fopen(filename, "r")) == NULL) | |
555 | return SR_ERR; | |
556 | ||
557 | if (!parse_header(file, ctx)) | |
558 | { | |
559 | sr_err("VCD parsing failed"); | |
560 | fclose(file); | |
561 | return SR_ERR; | |
562 | } | |
563 | ||
564 | /* Send header packet to the session bus. */ | |
565 | header.feed_version = 1; | |
566 | gettimeofday(&header.starttime, NULL); | |
567 | packet.type = SR_DF_HEADER; | |
568 | packet.payload = &header; | |
569 | sr_session_send(in->sdi, &packet); | |
570 | ||
571 | /* Send metadata about the SR_DF_LOGIC packets to come. */ | |
572 | packet.type = SR_DF_META_LOGIC; | |
573 | packet.payload = &meta; | |
0157808d | 574 | meta.samplerate = ctx->samplerate / ctx->downsample; |
99eaa206 PA |
575 | meta.num_probes = ctx->probecount; |
576 | sr_session_send(in->sdi, &packet); | |
577 | ||
61a429c9 PA |
578 | /* Parse the contents of the VCD file */ |
579 | parse_contents(file, in->sdi, ctx); | |
580 | ||
99eaa206 PA |
581 | /* Send end packet to the session bus. */ |
582 | packet.type = SR_DF_END; | |
583 | sr_session_send(in->sdi, &packet); | |
584 | ||
61a429c9 PA |
585 | fclose(file); |
586 | release_context(ctx); | |
99eaa206 PA |
587 | in->internal = NULL; |
588 | ||
589 | return SR_OK; | |
590 | } | |
591 | ||
592 | SR_PRIV struct sr_input_format input_vcd = { | |
593 | .id = "vcd", | |
594 | .description = "Value Change Dump", | |
595 | .format_match = format_match, | |
596 | .init = init, | |
597 | .loadfile = loadfile, | |
598 | }; |