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c44af4eb TT |
1 | /* Rust language support routines for GDB, the GNU debugger. |
2 | ||
3 | Copyright (C) 2016 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | ||
22 | #include <ctype.h> | |
23 | ||
24 | #include "block.h" | |
25 | #include "c-lang.h" | |
26 | #include "charset.h" | |
27 | #include "cp-support.h" | |
8b302db8 | 28 | #include "demangle.h" |
c44af4eb TT |
29 | #include "gdbarch.h" |
30 | #include "infcall.h" | |
31 | #include "objfiles.h" | |
32 | #include "rust-lang.h" | |
33 | #include "valprint.h" | |
34 | #include "varobj.h" | |
35 | ||
36 | extern initialize_file_ftype _initialize_rust_language; | |
37 | ||
38 | /* Returns the last segment of a Rust path like foo::bar::baz. Will | |
39 | not handle cases where the last segment contains generics. This | |
40 | will return NULL if the last segment cannot be found. */ | |
41 | ||
42 | static const char * | |
43 | rust_last_path_segment (const char * path) | |
44 | { | |
45 | const char *result = strrchr (path, ':'); | |
46 | ||
47 | if (result == NULL) | |
48 | return NULL; | |
49 | return result + 1; | |
50 | } | |
51 | ||
52 | /* Find the Rust crate for BLOCK. If no crate can be found, returns | |
53 | NULL. Otherwise, returns a newly allocated string that the caller | |
54 | is responsible for freeing. */ | |
55 | ||
56 | char * | |
57 | rust_crate_for_block (const struct block *block) | |
58 | { | |
59 | const char *scope = block_scope (block); | |
60 | ||
61 | if (scope[0] == '\0') | |
62 | return NULL; | |
63 | ||
64 | return xstrndup (scope, cp_find_first_component (scope)); | |
65 | } | |
66 | ||
67 | /* Information about the discriminant/variant of an enum */ | |
68 | ||
69 | struct disr_info | |
70 | { | |
71 | /* Name of field. Must be freed by caller. */ | |
72 | char *name; | |
73 | /* Field number in union. Negative on error. For an encoded enum, | |
74 | the "hidden" member will always be field 1, and the "real" member | |
75 | will always be field 0. */ | |
76 | int field_no; | |
77 | /* True if this is an encoded enum that has a single "real" member | |
78 | and a single "hidden" member. */ | |
79 | unsigned int is_encoded : 1; | |
80 | }; | |
81 | ||
82 | /* The prefix of a specially-encoded enum. */ | |
83 | ||
84 | #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$" | |
85 | ||
86 | /* The number of the real field. */ | |
87 | ||
88 | #define RUST_ENCODED_ENUM_REAL 0 | |
89 | ||
90 | /* The number of the hidden field. */ | |
91 | ||
92 | #define RUST_ENCODED_ENUM_HIDDEN 1 | |
93 | ||
94 | /* Utility function to get discriminant info for a given value. */ | |
95 | ||
96 | static struct disr_info | |
97 | rust_get_disr_info (struct type *type, const gdb_byte *valaddr, | |
98 | int embedded_offset, CORE_ADDR address, | |
99 | const struct value *val) | |
100 | { | |
101 | int i; | |
102 | struct disr_info ret; | |
103 | struct type *disr_type; | |
104 | struct ui_file *temp_file; | |
105 | struct value_print_options opts; | |
106 | struct cleanup *cleanup; | |
107 | const char *name_segment; | |
108 | ||
109 | get_no_prettyformat_print_options (&opts); | |
110 | ||
111 | ret.field_no = -1; | |
112 | ret.is_encoded = 0; | |
113 | ||
114 | if (TYPE_NFIELDS (type) == 0) | |
115 | error (_("Encountered void enum value")); | |
116 | ||
117 | /* If an enum has two values where one is empty and the other holds | |
118 | a pointer that cannot be zero; then the Rust compiler optimizes | |
119 | away the discriminant and instead uses a zero value in the | |
120 | pointer field to indicate the empty variant. */ | |
121 | if (strncmp (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX, | |
122 | strlen (RUST_ENUM_PREFIX)) == 0) | |
123 | { | |
b5a4b3c5 | 124 | char *name, *tail, *token; |
c44af4eb TT |
125 | unsigned long fieldno; |
126 | struct type *member_type; | |
127 | LONGEST value; | |
128 | ||
129 | ret.is_encoded = 1; | |
130 | ||
131 | if (TYPE_NFIELDS (type) != 1) | |
132 | error (_("Only expected one field in %s type"), RUST_ENUM_PREFIX); | |
133 | ||
b5a4b3c5 MG |
134 | /* Optimized enums have only one field. */ |
135 | member_type = TYPE_FIELD_TYPE (type, 0); | |
136 | ||
137 | name = xstrdup (TYPE_FIELD_NAME (type, 0)); | |
138 | cleanup = make_cleanup (xfree, name); | |
139 | tail = name + strlen (RUST_ENUM_PREFIX); | |
140 | ||
141 | /* The location of the value that doubles as a discriminant is | |
142 | stored in the name of the field, as | |
143 | RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname> | |
144 | where the fieldnos are the indices of the fields that should be | |
145 | traversed in order to find the field (which may be several fields deep) | |
146 | and the variantname is the name of the variant of the case when the | |
147 | field is zero. */ | |
148 | while ((token = strsep (&tail, "$")) != NULL) | |
149 | { | |
9e8a8ea8 TT |
150 | if (sscanf (token, "%lu", &fieldno) != 1) |
151 | { | |
152 | /* We have reached the enum name, which cannot start | |
153 | with a digit. */ | |
154 | break; | |
155 | } | |
b5a4b3c5 | 156 | if (fieldno >= TYPE_NFIELDS (member_type)) |
9e8a8ea8 TT |
157 | error (_("%s refers to field after end of member type"), |
158 | RUST_ENUM_PREFIX); | |
b5a4b3c5 MG |
159 | |
160 | embedded_offset += TYPE_FIELD_BITPOS (member_type, fieldno) / 8; | |
161 | member_type = TYPE_FIELD_TYPE (member_type, fieldno); | |
162 | } | |
163 | ||
164 | if (token >= name + strlen (TYPE_FIELD_NAME (type, 0))) | |
c44af4eb | 165 | error (_("Invalid form for %s"), RUST_ENUM_PREFIX); |
9e8a8ea8 | 166 | value = unpack_long (member_type, valaddr + embedded_offset); |
c44af4eb | 167 | |
c44af4eb TT |
168 | if (value == 0) |
169 | { | |
170 | ret.field_no = RUST_ENCODED_ENUM_HIDDEN; | |
b5a4b3c5 | 171 | ret.name = concat (TYPE_NAME (type), "::", token, (char *) NULL); |
c44af4eb TT |
172 | } |
173 | else | |
174 | { | |
175 | ret.field_no = RUST_ENCODED_ENUM_REAL; | |
176 | ret.name = concat (TYPE_NAME (type), "::", | |
b5a4b3c5 | 177 | rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (type, 0))), |
c44af4eb TT |
178 | (char *) NULL); |
179 | } | |
180 | ||
b5a4b3c5 | 181 | do_cleanups (cleanup); |
c44af4eb TT |
182 | return ret; |
183 | } | |
184 | ||
185 | disr_type = TYPE_FIELD_TYPE (type, 0); | |
186 | ||
187 | if (TYPE_NFIELDS (disr_type) == 0) | |
188 | { | |
189 | /* This is a bounds check and should never be hit unless Rust | |
190 | has changed its debuginfo format. */ | |
191 | error (_("Could not find enum discriminant field")); | |
192 | } | |
193 | ||
194 | if (strcmp (TYPE_FIELD_NAME (disr_type, 0), "RUST$ENUM$DISR") != 0) | |
195 | error (_("Rust debug format has changed")); | |
196 | ||
197 | temp_file = mem_fileopen (); | |
198 | cleanup = make_cleanup_ui_file_delete (temp_file); | |
199 | /* The first value of the first field (or any field) | |
200 | is the discriminant value. */ | |
201 | c_val_print (TYPE_FIELD_TYPE (disr_type, 0), valaddr, | |
202 | (embedded_offset + TYPE_FIELD_BITPOS (type, 0) / 8 | |
203 | + TYPE_FIELD_BITPOS (disr_type, 0) / 8), | |
204 | address, temp_file, | |
205 | 0, val, &opts); | |
206 | ||
207 | ret.name = ui_file_xstrdup (temp_file, NULL); | |
208 | name_segment = rust_last_path_segment (ret.name); | |
209 | if (name_segment != NULL) | |
210 | { | |
211 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
212 | { | |
213 | /* Sadly, the discriminant value paths do not match the type | |
214 | field name paths ('core::option::Option::Some' vs | |
215 | 'core::option::Some'). However, enum variant names are | |
216 | unique in the last path segment and the generics are not | |
217 | part of this path, so we can just compare those. This is | |
218 | hackish and would be better fixed by improving rustc's | |
219 | metadata for enums. */ | |
220 | const char *field_type = TYPE_NAME (TYPE_FIELD_TYPE (type, i)); | |
221 | ||
222 | if (field_type != NULL | |
223 | && strcmp (name_segment, | |
224 | rust_last_path_segment (field_type)) == 0) | |
225 | { | |
226 | ret.field_no = i; | |
227 | break; | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | if (ret.field_no == -1 && ret.name != NULL) | |
233 | { | |
234 | /* Somehow the discriminant wasn't found. */ | |
235 | make_cleanup (xfree, ret.name); | |
236 | error (_("Could not find variant of %s with discriminant %s"), | |
237 | TYPE_TAG_NAME (type), ret.name); | |
238 | } | |
239 | ||
240 | do_cleanups (cleanup); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | /* See rust-lang.h. */ | |
245 | ||
246 | int | |
247 | rust_tuple_type_p (struct type *type) | |
248 | { | |
249 | /* The current implementation is a bit of a hack, but there's | |
250 | nothing else in the debuginfo to distinguish a tuple from a | |
251 | struct. */ | |
252 | return (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
253 | && TYPE_TAG_NAME (type) != NULL | |
254 | && TYPE_TAG_NAME (type)[0] == '('); | |
255 | } | |
256 | ||
257 | ||
258 | /* Return true if all non-static fields of a structlike type are in a | |
259 | sequence like __0, __1, __2. OFFSET lets us skip fields. */ | |
260 | ||
261 | static int | |
262 | rust_underscore_fields (struct type *type, int offset) | |
263 | { | |
264 | int i, field_number; | |
265 | ||
266 | field_number = 0; | |
267 | ||
268 | if (TYPE_CODE (type) != TYPE_CODE_STRUCT) | |
269 | return 0; | |
270 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
271 | { | |
272 | if (!field_is_static (&TYPE_FIELD (type, i))) | |
273 | { | |
274 | if (offset > 0) | |
275 | offset--; | |
276 | else | |
277 | { | |
278 | char buf[20]; | |
279 | ||
280 | xsnprintf (buf, sizeof (buf), "__%d", field_number); | |
281 | if (strcmp (buf, TYPE_FIELD_NAME (type, i)) != 0) | |
282 | return 0; | |
283 | field_number++; | |
284 | } | |
285 | } | |
286 | } | |
287 | return 1; | |
288 | } | |
289 | ||
290 | /* See rust-lang.h. */ | |
291 | ||
292 | int | |
293 | rust_tuple_struct_type_p (struct type *type) | |
294 | { | |
295 | return rust_underscore_fields (type, 0); | |
296 | } | |
297 | ||
298 | /* Return true if a variant TYPE is a tuple variant, false otherwise. */ | |
299 | ||
300 | static int | |
301 | rust_tuple_variant_type_p (struct type *type) | |
302 | { | |
303 | /* First field is discriminant */ | |
304 | return rust_underscore_fields (type, 1); | |
305 | } | |
306 | ||
307 | /* Return true if TYPE is a slice type, otherwise false. */ | |
308 | ||
309 | static int | |
310 | rust_slice_type_p (struct type *type) | |
311 | { | |
312 | return (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
313 | && TYPE_TAG_NAME (type) != NULL | |
314 | && strncmp (TYPE_TAG_NAME (type), "&[", 2) == 0); | |
315 | } | |
316 | ||
317 | /* Return true if TYPE is a range type, otherwise false. */ | |
318 | ||
319 | static int | |
320 | rust_range_type_p (struct type *type) | |
321 | { | |
322 | int i; | |
323 | ||
324 | if (TYPE_CODE (type) != TYPE_CODE_STRUCT | |
325 | || TYPE_NFIELDS (type) > 2 | |
326 | || TYPE_TAG_NAME (type) == NULL | |
327 | || strstr (TYPE_TAG_NAME (type), "::Range") == NULL) | |
328 | return 0; | |
329 | ||
330 | if (TYPE_NFIELDS (type) == 0) | |
331 | return 1; | |
332 | ||
333 | i = 0; | |
334 | if (strcmp (TYPE_FIELD_NAME (type, 0), "start") == 0) | |
335 | { | |
336 | if (TYPE_NFIELDS (type) == 1) | |
337 | return 1; | |
338 | i = 1; | |
339 | } | |
340 | else if (TYPE_NFIELDS (type) == 2) | |
341 | { | |
342 | /* First field had to be "start". */ | |
343 | return 0; | |
344 | } | |
345 | ||
346 | return strcmp (TYPE_FIELD_NAME (type, i), "end") == 0; | |
347 | } | |
348 | ||
349 | /* Return true if TYPE seems to be the type "u8", otherwise false. */ | |
350 | ||
351 | static int | |
352 | rust_u8_type_p (struct type *type) | |
353 | { | |
354 | return (TYPE_CODE (type) == TYPE_CODE_INT | |
355 | && TYPE_UNSIGNED (type) | |
356 | && TYPE_LENGTH (type) == 1); | |
357 | } | |
358 | ||
359 | /* Return true if TYPE is a Rust character type. */ | |
360 | ||
361 | static int | |
362 | rust_chartype_p (struct type *type) | |
363 | { | |
364 | return (TYPE_CODE (type) == TYPE_CODE_CHAR | |
365 | && TYPE_LENGTH (type) == 4 | |
366 | && TYPE_UNSIGNED (type)); | |
367 | } | |
368 | ||
369 | \f | |
370 | ||
371 | /* la_emitchar implementation for Rust. */ | |
372 | ||
373 | static void | |
374 | rust_emitchar (int c, struct type *type, struct ui_file *stream, int quoter) | |
375 | { | |
376 | if (!rust_chartype_p (type)) | |
377 | generic_emit_char (c, type, stream, quoter, | |
378 | target_charset (get_type_arch (type))); | |
379 | else if (c == '\\' || c == quoter) | |
380 | fprintf_filtered (stream, "\\%c", c); | |
381 | else if (c == '\n') | |
382 | fputs_filtered ("\\n", stream); | |
383 | else if (c == '\r') | |
384 | fputs_filtered ("\\r", stream); | |
385 | else if (c == '\t') | |
386 | fputs_filtered ("\\t", stream); | |
387 | else if (c == '\0') | |
388 | fputs_filtered ("\\0", stream); | |
389 | else if (c >= 32 && c <= 127 && isprint (c)) | |
390 | fputc_filtered (c, stream); | |
391 | else if (c <= 255) | |
392 | fprintf_filtered (stream, "\\x%02x", c); | |
393 | else | |
394 | fprintf_filtered (stream, "\\u{%06x}", c); | |
395 | } | |
396 | ||
397 | /* la_printchar implementation for Rust. */ | |
398 | ||
399 | static void | |
400 | rust_printchar (int c, struct type *type, struct ui_file *stream) | |
401 | { | |
402 | fputs_filtered ("'", stream); | |
403 | LA_EMIT_CHAR (c, type, stream, '\''); | |
404 | fputs_filtered ("'", stream); | |
405 | } | |
406 | ||
407 | /* la_printstr implementation for Rust. */ | |
408 | ||
409 | static void | |
410 | rust_printstr (struct ui_file *stream, struct type *type, | |
411 | const gdb_byte *string, unsigned int length, | |
412 | const char *user_encoding, int force_ellipses, | |
413 | const struct value_print_options *options) | |
414 | { | |
415 | /* Rust always uses UTF-8, but let the caller override this if need | |
416 | be. */ | |
417 | const char *encoding = user_encoding; | |
418 | if (user_encoding == NULL || !*user_encoding) | |
419 | { | |
420 | /* In Rust strings, characters are "u8". */ | |
421 | if (rust_u8_type_p (type)) | |
422 | encoding = "UTF-8"; | |
423 | else | |
424 | { | |
425 | /* This is probably some C string, so let's let C deal with | |
426 | it. */ | |
427 | c_printstr (stream, type, string, length, user_encoding, | |
428 | force_ellipses, options); | |
429 | return; | |
430 | } | |
431 | } | |
432 | ||
433 | /* This is not ideal as it doesn't use our character printer. */ | |
434 | generic_printstr (stream, type, string, length, encoding, force_ellipses, | |
435 | '"', 0, options); | |
436 | } | |
437 | ||
438 | \f | |
439 | ||
440 | static const struct generic_val_print_decorations rust_decorations = | |
441 | { | |
442 | /* Complex isn't used in Rust, but we provide C-ish values just in | |
443 | case. */ | |
444 | "", | |
445 | " + ", | |
446 | " * I", | |
447 | "true", | |
448 | "false", | |
921d8f54 | 449 | "()", |
c44af4eb TT |
450 | "[", |
451 | "]" | |
452 | }; | |
453 | ||
454 | /* la_val_print implementation for Rust. */ | |
455 | ||
456 | static void | |
457 | rust_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset, | |
458 | CORE_ADDR address, struct ui_file *stream, int recurse, | |
459 | const struct value *val, | |
460 | const struct value_print_options *options) | |
461 | { | |
462 | type = check_typedef (type); | |
463 | switch (TYPE_CODE (type)) | |
464 | { | |
465 | case TYPE_CODE_PTR: | |
466 | { | |
467 | LONGEST low_bound, high_bound; | |
468 | ||
469 | if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_ARRAY | |
470 | && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type))) | |
471 | && get_array_bounds (TYPE_TARGET_TYPE (type), &low_bound, | |
472 | &high_bound)) { | |
473 | /* We have a pointer to a byte string, so just print | |
474 | that. */ | |
475 | struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type)); | |
476 | CORE_ADDR addr; | |
477 | struct gdbarch *arch = get_type_arch (type); | |
478 | int unit_size = gdbarch_addressable_memory_unit_size (arch); | |
479 | ||
480 | addr = unpack_pointer (type, valaddr + embedded_offset * unit_size); | |
481 | if (options->addressprint) | |
482 | { | |
483 | fputs_filtered (paddress (arch, addr), stream); | |
484 | fputs_filtered (" ", stream); | |
485 | } | |
486 | ||
487 | fputs_filtered ("b", stream); | |
488 | val_print_string (TYPE_TARGET_TYPE (elttype), "ASCII", addr, | |
489 | high_bound - low_bound + 1, stream, | |
490 | options); | |
491 | break; | |
492 | } | |
493 | } | |
494 | /* Fall through. */ | |
495 | ||
496 | case TYPE_CODE_METHODPTR: | |
497 | case TYPE_CODE_MEMBERPTR: | |
498 | c_val_print (type, valaddr, embedded_offset, address, stream, | |
499 | recurse, val, options); | |
500 | break; | |
501 | ||
502 | case TYPE_CODE_INT: | |
503 | /* Recognize the unit type. */ | |
504 | if (TYPE_UNSIGNED (type) && TYPE_LENGTH (type) == 0 | |
505 | && TYPE_NAME (type) != NULL && strcmp (TYPE_NAME (type), "()") == 0) | |
506 | { | |
507 | fputs_filtered ("()", stream); | |
508 | break; | |
509 | } | |
510 | goto generic_print; | |
511 | ||
512 | case TYPE_CODE_STRING: | |
513 | { | |
514 | struct gdbarch *arch = get_type_arch (type); | |
515 | int unit_size = gdbarch_addressable_memory_unit_size (arch); | |
516 | LONGEST low_bound, high_bound; | |
517 | ||
518 | if (!get_array_bounds (type, &low_bound, &high_bound)) | |
519 | error (_("Could not determine the array bounds")); | |
520 | ||
521 | /* If we see a plain TYPE_CODE_STRING, then we're printing a | |
522 | byte string, hence the choice of "ASCII" as the | |
523 | encoding. */ | |
524 | fputs_filtered ("b", stream); | |
525 | rust_printstr (stream, TYPE_TARGET_TYPE (type), | |
526 | valaddr + embedded_offset * unit_size, | |
527 | high_bound - low_bound + 1, "ASCII", 0, options); | |
528 | } | |
529 | break; | |
530 | ||
531 | case TYPE_CODE_ARRAY: | |
532 | { | |
533 | LONGEST low_bound, high_bound; | |
534 | ||
535 | if (get_array_bounds (type, &low_bound, &high_bound) | |
536 | && high_bound - low_bound + 1 == 0) | |
537 | fputs_filtered ("[]", stream); | |
538 | else | |
539 | goto generic_print; | |
540 | } | |
541 | break; | |
542 | ||
543 | case TYPE_CODE_UNION: | |
544 | { | |
545 | int j, nfields, first_field, is_tuple, start; | |
546 | struct type *variant_type; | |
547 | struct disr_info disr; | |
548 | struct value_print_options opts; | |
549 | struct cleanup *cleanup; | |
550 | ||
551 | opts = *options; | |
552 | opts.deref_ref = 0; | |
553 | ||
554 | disr = rust_get_disr_info (type, valaddr, embedded_offset, address, | |
555 | val); | |
556 | cleanup = make_cleanup (xfree, disr.name); | |
557 | ||
558 | if (disr.is_encoded && disr.field_no == RUST_ENCODED_ENUM_HIDDEN) | |
559 | { | |
560 | fprintf_filtered (stream, "%s", disr.name); | |
561 | goto cleanup; | |
562 | } | |
563 | ||
564 | first_field = 1; | |
565 | variant_type = TYPE_FIELD_TYPE (type, disr.field_no); | |
566 | nfields = TYPE_NFIELDS (variant_type); | |
567 | ||
568 | is_tuple = (disr.is_encoded | |
569 | ? rust_tuple_struct_type_p (variant_type) | |
570 | : rust_tuple_variant_type_p (variant_type)); | |
571 | start = disr.is_encoded ? 0 : 1; | |
572 | ||
573 | if (nfields > start) | |
574 | { | |
575 | /* In case of a non-nullary variant, we output 'Foo(x,y,z)'. */ | |
576 | if (is_tuple) | |
577 | fprintf_filtered (stream, "%s(", disr.name); | |
578 | else | |
579 | { | |
580 | /* struct variant. */ | |
581 | fprintf_filtered (stream, "%s{", disr.name); | |
582 | } | |
583 | } | |
584 | else | |
585 | { | |
586 | /* In case of a nullary variant like 'None', just output | |
587 | the name. */ | |
588 | fprintf_filtered (stream, "%s", disr.name); | |
589 | goto cleanup; | |
590 | } | |
591 | ||
592 | for (j = start; j < TYPE_NFIELDS (variant_type); j++) | |
593 | { | |
594 | if (!first_field) | |
595 | fputs_filtered (", ", stream); | |
596 | first_field = 0; | |
597 | ||
598 | if (!is_tuple) | |
599 | fprintf_filtered (stream, "%s: ", | |
600 | TYPE_FIELD_NAME (variant_type, j)); | |
601 | ||
602 | val_print (TYPE_FIELD_TYPE (variant_type, j), | |
603 | valaddr, | |
604 | (embedded_offset | |
605 | + TYPE_FIELD_BITPOS (type, disr.field_no) / 8 | |
606 | + TYPE_FIELD_BITPOS (variant_type, j) / 8), | |
607 | address, | |
608 | stream, recurse + 1, val, &opts, | |
609 | current_language); | |
610 | } | |
611 | ||
612 | if (is_tuple) | |
613 | fputs_filtered (")", stream); | |
614 | else | |
615 | fputs_filtered ("}", stream); | |
616 | ||
617 | cleanup: | |
618 | do_cleanups (cleanup); | |
619 | } | |
620 | break; | |
621 | ||
622 | case TYPE_CODE_STRUCT: | |
623 | { | |
624 | int i; | |
625 | int first_field; | |
626 | int is_tuple = rust_tuple_type_p (type); | |
627 | int is_tuple_struct = !is_tuple && rust_tuple_struct_type_p (type); | |
628 | struct value_print_options opts; | |
629 | ||
630 | if (!is_tuple) | |
631 | { | |
632 | if (TYPE_TAG_NAME (type) != NULL) | |
633 | fprintf_filtered (stream, "%s", TYPE_TAG_NAME (type)); | |
634 | ||
635 | if (TYPE_NFIELDS (type) == 0) | |
636 | break; | |
637 | ||
638 | if (TYPE_TAG_NAME (type) != NULL) | |
639 | fputs_filtered (" ", stream); | |
640 | } | |
641 | ||
642 | if (is_tuple || is_tuple_struct) | |
643 | fputs_filtered ("(", stream); | |
644 | else | |
645 | fputs_filtered ("{", stream); | |
646 | ||
647 | opts = *options; | |
648 | opts.deref_ref = 0; | |
649 | ||
650 | first_field = 1; | |
651 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
652 | { | |
653 | if (field_is_static (&TYPE_FIELD (type, i))) | |
654 | continue; | |
655 | ||
656 | if (!first_field) | |
657 | fputs_filtered (",", stream); | |
658 | ||
659 | if (options->prettyformat) | |
660 | { | |
661 | fputs_filtered ("\n", stream); | |
662 | print_spaces_filtered (2 + 2 * recurse, stream); | |
663 | } | |
664 | else if (!first_field) | |
665 | fputs_filtered (" ", stream); | |
666 | ||
667 | first_field = 0; | |
668 | ||
669 | if (!is_tuple && !is_tuple_struct) | |
670 | { | |
671 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); | |
672 | fputs_filtered (": ", stream); | |
673 | } | |
674 | ||
675 | val_print (TYPE_FIELD_TYPE (type, i), | |
676 | valaddr, | |
677 | embedded_offset + TYPE_FIELD_BITPOS (type, i) / 8, | |
678 | address, | |
679 | stream, recurse + 1, val, &opts, | |
680 | current_language); | |
681 | } | |
682 | ||
683 | if (options->prettyformat) | |
684 | { | |
685 | fputs_filtered ("\n", stream); | |
686 | print_spaces_filtered (2 * recurse, stream); | |
687 | } | |
688 | ||
689 | if (is_tuple || is_tuple_struct) | |
690 | fputs_filtered (")", stream); | |
691 | else | |
692 | fputs_filtered ("}", stream); | |
693 | } | |
694 | break; | |
695 | ||
696 | default: | |
697 | generic_print: | |
698 | /* Nothing special yet. */ | |
699 | generic_val_print (type, valaddr, embedded_offset, address, stream, | |
700 | recurse, val, options, &rust_decorations); | |
701 | } | |
702 | } | |
703 | ||
704 | \f | |
705 | ||
706 | /* la_print_typedef implementation for Rust. */ | |
707 | ||
708 | static void | |
709 | rust_print_typedef (struct type *type, | |
710 | struct symbol *new_symbol, | |
711 | struct ui_file *stream) | |
712 | { | |
713 | type = check_typedef (type); | |
714 | fprintf_filtered (stream, "type %s = ", SYMBOL_PRINT_NAME (new_symbol)); | |
715 | type_print (type, "", stream, 0); | |
716 | fprintf_filtered (stream, ";\n"); | |
717 | } | |
718 | ||
719 | /* la_print_type implementation for Rust. */ | |
720 | ||
721 | static void | |
722 | rust_print_type (struct type *type, const char *varstring, | |
723 | struct ui_file *stream, int show, int level, | |
724 | const struct type_print_options *flags) | |
725 | { | |
726 | int i; | |
727 | ||
728 | QUIT; | |
729 | if (show <= 0 | |
730 | && TYPE_NAME (type) != NULL) | |
731 | { | |
921d8f54 MG |
732 | /* Rust calls the unit type "void" in its debuginfo, |
733 | but we don't want to print it as that. */ | |
734 | if (TYPE_CODE (type) == TYPE_CODE_VOID) | |
735 | fputs_filtered ("()", stream); | |
736 | else | |
737 | fputs_filtered (TYPE_NAME (type), stream); | |
c44af4eb TT |
738 | return; |
739 | } | |
740 | ||
741 | type = check_typedef (type); | |
742 | switch (TYPE_CODE (type)) | |
743 | { | |
921d8f54 MG |
744 | case TYPE_CODE_VOID: |
745 | fputs_filtered ("()", stream); | |
746 | break; | |
747 | ||
c44af4eb TT |
748 | case TYPE_CODE_FUNC: |
749 | /* Delegate varargs to the C printer. */ | |
750 | if (TYPE_VARARGS (type)) | |
751 | goto c_printer; | |
752 | ||
753 | fputs_filtered ("fn ", stream); | |
754 | if (varstring != NULL) | |
755 | fputs_filtered (varstring, stream); | |
756 | fputs_filtered ("(", stream); | |
757 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
758 | { | |
759 | QUIT; | |
760 | if (i > 0) | |
761 | fputs_filtered (", ", stream); | |
762 | rust_print_type (TYPE_FIELD_TYPE (type, i), "", stream, -1, 0, | |
763 | flags); | |
764 | } | |
921d8f54 MG |
765 | fputs_filtered (")", stream); |
766 | /* If it returns unit, we can omit the return type. */ | |
767 | if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID) | |
768 | { | |
769 | fputs_filtered (" -> ", stream); | |
770 | rust_print_type (TYPE_TARGET_TYPE (type), "", stream, -1, 0, flags); | |
771 | } | |
c44af4eb TT |
772 | break; |
773 | ||
774 | case TYPE_CODE_ARRAY: | |
775 | { | |
776 | LONGEST low_bound, high_bound; | |
777 | ||
778 | fputs_filtered ("[", stream); | |
779 | rust_print_type (TYPE_TARGET_TYPE (type), NULL, | |
780 | stream, show - 1, level, flags); | |
781 | fputs_filtered ("; ", stream); | |
782 | ||
783 | if (TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCEXPR | |
784 | || TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCLIST) | |
785 | fprintf_filtered (stream, "variable length"); | |
786 | else if (get_array_bounds (type, &low_bound, &high_bound)) | |
787 | fprintf_filtered (stream, "%s", | |
788 | plongest (high_bound - low_bound + 1)); | |
789 | fputs_filtered ("]", stream); | |
790 | } | |
791 | break; | |
792 | ||
793 | case TYPE_CODE_STRUCT: | |
794 | { | |
795 | int is_tuple_struct; | |
796 | ||
797 | /* Print a tuple type simply. */ | |
798 | if (rust_tuple_type_p (type)) | |
799 | { | |
800 | fputs_filtered (TYPE_TAG_NAME (type), stream); | |
801 | break; | |
802 | } | |
803 | ||
804 | /* If we see a base class, delegate to C. */ | |
805 | if (TYPE_N_BASECLASSES (type) > 0) | |
806 | goto c_printer; | |
807 | ||
808 | fputs_filtered ("struct ", stream); | |
809 | if (TYPE_TAG_NAME (type) != NULL) | |
810 | fputs_filtered (TYPE_TAG_NAME (type), stream); | |
811 | ||
812 | is_tuple_struct = rust_tuple_struct_type_p (type); | |
813 | ||
814 | if (TYPE_NFIELDS (type) == 0 && !rust_tuple_type_p (type)) | |
815 | break; | |
816 | fputs_filtered (is_tuple_struct ? " (\n" : " {\n", stream); | |
817 | ||
818 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
819 | { | |
820 | const char *name; | |
821 | ||
822 | QUIT; | |
823 | if (field_is_static (&TYPE_FIELD (type, i))) | |
824 | continue; | |
825 | ||
826 | /* We'd like to print "pub" here as needed, but rustc | |
827 | doesn't emit the debuginfo, and our types don't have | |
828 | cplus_struct_type attached. */ | |
829 | ||
830 | /* For a tuple struct we print the type but nothing | |
831 | else. */ | |
832 | print_spaces_filtered (level + 2, stream); | |
833 | if (!is_tuple_struct) | |
834 | fprintf_filtered (stream, "%s: ", TYPE_FIELD_NAME (type, i)); | |
835 | ||
836 | rust_print_type (TYPE_FIELD_TYPE (type, i), NULL, | |
837 | stream, show - 1, level + 2, | |
838 | flags); | |
839 | fputs_filtered (",\n", stream); | |
840 | } | |
841 | ||
842 | fprintfi_filtered (level, stream, is_tuple_struct ? ")" : "}"); | |
843 | } | |
844 | break; | |
845 | ||
846 | case TYPE_CODE_ENUM: | |
847 | { | |
848 | int i, len = 0; | |
849 | ||
850 | fputs_filtered ("enum ", stream); | |
851 | if (TYPE_TAG_NAME (type) != NULL) | |
852 | { | |
853 | fputs_filtered (TYPE_TAG_NAME (type), stream); | |
854 | fputs_filtered (" ", stream); | |
855 | len = strlen (TYPE_TAG_NAME (type)); | |
856 | } | |
857 | fputs_filtered ("{\n", stream); | |
858 | ||
859 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
860 | { | |
861 | const char *name = TYPE_FIELD_NAME (type, i); | |
862 | ||
863 | QUIT; | |
864 | ||
865 | if (len > 0 | |
866 | && strncmp (name, TYPE_TAG_NAME (type), len) == 0 | |
867 | && name[len] == ':' | |
868 | && name[len + 1] == ':') | |
869 | name += len + 2; | |
870 | fprintfi_filtered (level + 2, stream, "%s,\n", name); | |
871 | } | |
872 | ||
873 | fputs_filtered ("}", stream); | |
874 | } | |
875 | break; | |
876 | ||
877 | case TYPE_CODE_UNION: | |
878 | { | |
b5a4b3c5 | 879 | /* ADT enums. */ |
c44af4eb | 880 | int i, len = 0; |
b5a4b3c5 MG |
881 | /* Skip the discriminant field. */ |
882 | int skip_to = 1; | |
c44af4eb TT |
883 | |
884 | fputs_filtered ("enum ", stream); | |
885 | if (TYPE_TAG_NAME (type) != NULL) | |
886 | { | |
887 | fputs_filtered (TYPE_TAG_NAME (type), stream); | |
888 | fputs_filtered (" ", stream); | |
889 | len = strlen (TYPE_TAG_NAME (type)); | |
890 | } | |
b5a4b3c5 MG |
891 | fputs_filtered ("{\n", stream); |
892 | ||
9e8a8ea8 TT |
893 | if (strncmp (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX, |
894 | strlen (RUST_ENUM_PREFIX)) == 0) | |
895 | { | |
896 | const char *zero_field = strrchr (TYPE_FIELD_NAME (type, 0), '$'); | |
897 | if (zero_field != NULL && strlen (zero_field) > 1) | |
898 | { | |
899 | fprintfi_filtered (level + 2, stream, "%s,\n", zero_field + 1); | |
900 | /* There is no explicit discriminant field, skip nothing. */ | |
901 | skip_to = 0; | |
902 | } | |
903 | } | |
c44af4eb TT |
904 | |
905 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
906 | { | |
907 | struct type *variant_type = TYPE_FIELD_TYPE (type, i); | |
908 | const char *name | |
909 | = rust_last_path_segment (TYPE_NAME (variant_type)); | |
910 | ||
911 | fprintfi_filtered (level + 2, stream, "%s", name); | |
912 | ||
b5a4b3c5 | 913 | if (TYPE_NFIELDS (variant_type) > skip_to) |
c44af4eb TT |
914 | { |
915 | int first = 1; | |
916 | int is_tuple = rust_tuple_variant_type_p (variant_type); | |
917 | int j; | |
918 | ||
919 | fputs_filtered (is_tuple ? "(" : "{", stream); | |
b5a4b3c5 | 920 | for (j = skip_to; j < TYPE_NFIELDS (variant_type); j++) |
c44af4eb TT |
921 | { |
922 | if (first) | |
923 | first = 0; | |
924 | else | |
925 | fputs_filtered (", ", stream); | |
926 | ||
927 | if (!is_tuple) | |
928 | fprintf_filtered (stream, "%s: ", | |
929 | TYPE_FIELD_NAME (variant_type, j)); | |
930 | ||
931 | rust_print_type (TYPE_FIELD_TYPE (variant_type, j), NULL, | |
932 | stream, show - 1, level + 2, | |
933 | flags); | |
934 | } | |
935 | fputs_filtered (is_tuple ? ")" : "}", stream); | |
936 | } | |
937 | ||
938 | fputs_filtered (",\n", stream); | |
939 | } | |
940 | ||
941 | fputs_filtered ("}", stream); | |
942 | } | |
943 | break; | |
944 | ||
945 | default: | |
946 | c_printer: | |
947 | c_print_type (type, varstring, stream, show, level, flags); | |
948 | } | |
949 | } | |
950 | ||
951 | \f | |
952 | ||
953 | /* Compute the alignment of the type T. */ | |
954 | ||
955 | static int | |
956 | rust_type_alignment (struct type *t) | |
957 | { | |
958 | t = check_typedef (t); | |
959 | switch (TYPE_CODE (t)) | |
960 | { | |
961 | default: | |
962 | error (_("Could not compute alignment of type")); | |
963 | ||
964 | case TYPE_CODE_PTR: | |
965 | case TYPE_CODE_ENUM: | |
966 | case TYPE_CODE_INT: | |
967 | case TYPE_CODE_FLT: | |
968 | case TYPE_CODE_REF: | |
969 | case TYPE_CODE_CHAR: | |
970 | case TYPE_CODE_BOOL: | |
971 | return TYPE_LENGTH (t); | |
972 | ||
973 | case TYPE_CODE_ARRAY: | |
974 | case TYPE_CODE_COMPLEX: | |
975 | return rust_type_alignment (TYPE_TARGET_TYPE (t)); | |
976 | ||
977 | case TYPE_CODE_STRUCT: | |
978 | case TYPE_CODE_UNION: | |
979 | { | |
980 | int i; | |
981 | int align = 1; | |
982 | ||
983 | for (i = 0; i < TYPE_NFIELDS (t); ++i) | |
984 | { | |
985 | int a = rust_type_alignment (TYPE_FIELD_TYPE (t, i)); | |
986 | if (a > align) | |
987 | align = a; | |
988 | } | |
989 | return align; | |
990 | } | |
991 | } | |
992 | } | |
993 | ||
994 | /* Like arch_composite_type, but uses TYPE to decide how to allocate | |
995 | -- either on an obstack or on a gdbarch. */ | |
996 | ||
997 | static struct type * | |
998 | rust_composite_type (struct type *original, | |
999 | const char *name, | |
1000 | const char *field1, struct type *type1, | |
1001 | const char *field2, struct type *type2) | |
1002 | { | |
1003 | struct type *result = alloc_type_copy (original); | |
1004 | int i, nfields, bitpos; | |
1005 | ||
1006 | nfields = 0; | |
1007 | if (field1 != NULL) | |
1008 | ++nfields; | |
1009 | if (field2 != NULL) | |
1010 | ++nfields; | |
1011 | ||
1012 | TYPE_CODE (result) = TYPE_CODE_STRUCT; | |
1013 | TYPE_NAME (result) = name; | |
1014 | TYPE_TAG_NAME (result) = name; | |
1015 | ||
1016 | TYPE_NFIELDS (result) = nfields; | |
1017 | TYPE_FIELDS (result) | |
1018 | = (struct field *) TYPE_ZALLOC (result, nfields * sizeof (struct field)); | |
1019 | ||
1020 | i = 0; | |
1021 | bitpos = 0; | |
1022 | if (field1 != NULL) | |
1023 | { | |
1024 | struct field *field = &TYPE_FIELD (result, i); | |
1025 | ||
1026 | SET_FIELD_BITPOS (*field, bitpos); | |
1027 | bitpos += TYPE_LENGTH (type1) * TARGET_CHAR_BIT; | |
1028 | ||
1029 | FIELD_NAME (*field) = field1; | |
1030 | FIELD_TYPE (*field) = type1; | |
1031 | ++i; | |
1032 | } | |
1033 | if (field2 != NULL) | |
1034 | { | |
1035 | struct field *field = &TYPE_FIELD (result, i); | |
1036 | int align = rust_type_alignment (type2); | |
1037 | ||
1038 | if (align != 0) | |
1039 | { | |
1040 | int delta; | |
1041 | ||
1042 | align *= TARGET_CHAR_BIT; | |
1043 | delta = bitpos % align; | |
1044 | if (delta != 0) | |
1045 | bitpos += align - delta; | |
1046 | } | |
1047 | SET_FIELD_BITPOS (*field, bitpos); | |
1048 | ||
1049 | FIELD_NAME (*field) = field2; | |
1050 | FIELD_TYPE (*field) = type2; | |
1051 | ++i; | |
1052 | } | |
1053 | ||
1054 | if (i > 0) | |
1055 | TYPE_LENGTH (result) | |
1056 | = (TYPE_FIELD_BITPOS (result, i - 1) / TARGET_CHAR_BIT + | |
1057 | TYPE_LENGTH (TYPE_FIELD_TYPE (result, i - 1))); | |
1058 | return result; | |
1059 | } | |
1060 | ||
1061 | /* See rust-lang.h. */ | |
1062 | ||
1063 | struct type * | |
1064 | rust_slice_type (const char *name, struct type *elt_type, | |
1065 | struct type *usize_type) | |
1066 | { | |
1067 | struct type *type; | |
1068 | ||
1069 | elt_type = lookup_pointer_type (elt_type); | |
1070 | type = rust_composite_type (elt_type, name, | |
1071 | "data_ptr", elt_type, | |
1072 | "length", usize_type); | |
1073 | ||
1074 | return type; | |
1075 | } | |
1076 | ||
1077 | enum rust_primitive_types | |
1078 | { | |
1079 | rust_primitive_bool, | |
1080 | rust_primitive_char, | |
1081 | rust_primitive_i8, | |
1082 | rust_primitive_u8, | |
1083 | rust_primitive_i16, | |
1084 | rust_primitive_u16, | |
1085 | rust_primitive_i32, | |
1086 | rust_primitive_u32, | |
1087 | rust_primitive_i64, | |
1088 | rust_primitive_u64, | |
1089 | rust_primitive_isize, | |
1090 | rust_primitive_usize, | |
1091 | rust_primitive_f32, | |
1092 | rust_primitive_f64, | |
1093 | rust_primitive_unit, | |
1094 | rust_primitive_str, | |
1095 | nr_rust_primitive_types | |
1096 | }; | |
1097 | ||
1098 | /* la_language_arch_info implementation for Rust. */ | |
1099 | ||
1100 | static void | |
1101 | rust_language_arch_info (struct gdbarch *gdbarch, | |
1102 | struct language_arch_info *lai) | |
1103 | { | |
1104 | const struct builtin_type *builtin = builtin_type (gdbarch); | |
1105 | struct type *tem; | |
1106 | struct type **types; | |
1107 | unsigned int length; | |
1108 | ||
1109 | types = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_rust_primitive_types + 1, | |
1110 | struct type *); | |
1111 | ||
1112 | types[rust_primitive_bool] = arch_boolean_type (gdbarch, 8, 1, "bool"); | |
1113 | types[rust_primitive_char] = arch_character_type (gdbarch, 32, 1, "char"); | |
1114 | types[rust_primitive_i8] = arch_integer_type (gdbarch, 8, 0, "i8"); | |
1115 | types[rust_primitive_u8] = arch_integer_type (gdbarch, 8, 1, "u8"); | |
1116 | types[rust_primitive_i16] = arch_integer_type (gdbarch, 16, 0, "i16"); | |
1117 | types[rust_primitive_u16] = arch_integer_type (gdbarch, 16, 1, "u16"); | |
1118 | types[rust_primitive_i32] = arch_integer_type (gdbarch, 32, 0, "i32"); | |
1119 | types[rust_primitive_u32] = arch_integer_type (gdbarch, 32, 1, "u32"); | |
1120 | types[rust_primitive_i64] = arch_integer_type (gdbarch, 64, 0, "i64"); | |
1121 | types[rust_primitive_u64] = arch_integer_type (gdbarch, 64, 1, "u64"); | |
1122 | ||
1123 | length = 8 * TYPE_LENGTH (builtin->builtin_data_ptr); | |
1124 | types[rust_primitive_isize] = arch_integer_type (gdbarch, length, 0, "isize"); | |
1125 | types[rust_primitive_usize] = arch_integer_type (gdbarch, length, 1, "usize"); | |
1126 | ||
1127 | types[rust_primitive_f32] = arch_float_type (gdbarch, 32, "f32", NULL); | |
1128 | types[rust_primitive_f64] = arch_float_type (gdbarch, 64, "f64", NULL); | |
1129 | ||
1130 | types[rust_primitive_unit] = arch_integer_type (gdbarch, 0, 1, "()"); | |
1131 | ||
1132 | tem = make_cv_type (1, 0, types[rust_primitive_u8], NULL); | |
1133 | types[rust_primitive_str] = rust_slice_type ("&str", tem, | |
1134 | types[rust_primitive_usize]); | |
1135 | ||
1136 | lai->primitive_type_vector = types; | |
1137 | lai->bool_type_default = types[rust_primitive_bool]; | |
1138 | lai->string_char_type = types[rust_primitive_u8]; | |
1139 | } | |
1140 | ||
1141 | \f | |
1142 | ||
1143 | /* A helper for rust_evaluate_subexp that handles OP_FUNCALL. */ | |
1144 | ||
1145 | static struct value * | |
1146 | rust_evaluate_funcall (struct expression *exp, int *pos, enum noside noside) | |
1147 | { | |
1148 | int i; | |
1149 | int num_args = exp->elts[*pos + 1].longconst; | |
1150 | const char *method; | |
1151 | char *name; | |
1152 | struct value *function, *result, *arg0; | |
1153 | struct value **args; | |
1154 | struct cleanup *cleanup; | |
1155 | struct type *type, *fn_type; | |
1156 | const struct block *block; | |
1157 | struct block_symbol sym; | |
1158 | ||
1159 | /* For an ordinary function call we can simply defer to the | |
1160 | generic implementation. */ | |
1161 | if (exp->elts[*pos + 3].opcode != STRUCTOP_STRUCT) | |
1162 | return evaluate_subexp_standard (NULL, exp, pos, noside); | |
1163 | ||
1164 | /* Skip over the OP_FUNCALL and the STRUCTOP_STRUCT. */ | |
1165 | *pos += 4; | |
1166 | method = &exp->elts[*pos + 1].string; | |
1167 | *pos += 3 + BYTES_TO_EXP_ELEM (exp->elts[*pos].longconst + 1); | |
1168 | ||
1169 | /* Evaluate the argument to STRUCTOP_STRUCT, then find its | |
1170 | type in order to look up the method. */ | |
1171 | arg0 = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1172 | ||
1173 | if (noside == EVAL_SKIP) | |
1174 | { | |
1175 | for (i = 0; i < num_args; ++i) | |
1176 | evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1177 | return arg0; | |
1178 | } | |
1179 | ||
1180 | args = XNEWVEC (struct value *, num_args + 1); | |
1181 | cleanup = make_cleanup (xfree, args); | |
1182 | args[0] = arg0; | |
1183 | ||
1184 | /* We don't yet implement real Deref semantics. */ | |
1185 | while (TYPE_CODE (value_type (args[0])) == TYPE_CODE_PTR) | |
1186 | args[0] = value_ind (args[0]); | |
1187 | ||
1188 | type = value_type (args[0]); | |
1189 | if ((TYPE_CODE (type) != TYPE_CODE_STRUCT | |
1190 | && TYPE_CODE (type) != TYPE_CODE_UNION | |
1191 | && TYPE_CODE (type) != TYPE_CODE_ENUM) | |
1192 | || rust_tuple_type_p (type)) | |
1193 | error (_("Method calls only supported on struct or enum types")); | |
1194 | if (TYPE_TAG_NAME (type) == NULL) | |
1195 | error (_("Method call on nameless type")); | |
1196 | ||
1197 | name = concat (TYPE_TAG_NAME (type), "::", method, (char *) NULL); | |
1198 | make_cleanup (xfree, name); | |
1199 | ||
1200 | block = get_selected_block (0); | |
1201 | sym = lookup_symbol (name, block, VAR_DOMAIN, NULL); | |
1202 | if (sym.symbol == NULL) | |
1203 | error (_("Could not find function named '%s'"), name); | |
1204 | ||
1205 | fn_type = SYMBOL_TYPE (sym.symbol); | |
1206 | if (TYPE_NFIELDS (fn_type) == 0) | |
1207 | error (_("Function '%s' takes no arguments"), name); | |
1208 | ||
1209 | if (TYPE_CODE (TYPE_FIELD_TYPE (fn_type, 0)) == TYPE_CODE_PTR) | |
1210 | args[0] = value_addr (args[0]); | |
1211 | ||
1212 | function = address_of_variable (sym.symbol, block); | |
1213 | ||
1214 | for (i = 0; i < num_args; ++i) | |
1215 | args[i + 1] = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1216 | ||
1217 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1218 | result = value_zero (TYPE_TARGET_TYPE (fn_type), not_lval); | |
1219 | else | |
1220 | result = call_function_by_hand (function, num_args + 1, args); | |
1221 | do_cleanups (cleanup); | |
1222 | return result; | |
1223 | } | |
1224 | ||
01739a3b | 1225 | /* A helper for rust_evaluate_subexp that handles OP_RANGE. */ |
c44af4eb TT |
1226 | |
1227 | static struct value * | |
1228 | rust_range (struct expression *exp, int *pos, enum noside noside) | |
1229 | { | |
01739a3b | 1230 | enum range_type kind; |
c44af4eb TT |
1231 | struct value *low = NULL, *high = NULL; |
1232 | struct value *addrval, *result; | |
1233 | CORE_ADDR addr; | |
1234 | struct type *range_type; | |
1235 | struct type *index_type; | |
1236 | struct type *temp_type; | |
1237 | const char *name; | |
1238 | ||
01739a3b | 1239 | kind = (enum range_type) longest_to_int (exp->elts[*pos + 1].longconst); |
c44af4eb TT |
1240 | *pos += 3; |
1241 | ||
1242 | if (kind == HIGH_BOUND_DEFAULT || kind == NONE_BOUND_DEFAULT) | |
1243 | low = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1244 | if (kind == LOW_BOUND_DEFAULT || kind == NONE_BOUND_DEFAULT) | |
1245 | high = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1246 | ||
1247 | if (noside == EVAL_SKIP) | |
1248 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); | |
1249 | ||
1250 | if (low == NULL) | |
1251 | { | |
1252 | if (high == NULL) | |
1253 | { | |
1254 | index_type = NULL; | |
1255 | name = "std::ops::RangeFull"; | |
1256 | } | |
1257 | else | |
1258 | { | |
1259 | index_type = value_type (high); | |
1260 | name = "std::ops::RangeTo"; | |
1261 | } | |
1262 | } | |
1263 | else | |
1264 | { | |
1265 | if (high == NULL) | |
1266 | { | |
1267 | index_type = value_type (low); | |
1268 | name = "std::ops::RangeFrom"; | |
1269 | } | |
1270 | else | |
1271 | { | |
1272 | if (!types_equal (value_type (low), value_type (high))) | |
1273 | error (_("Range expression with different types")); | |
1274 | index_type = value_type (low); | |
1275 | name = "std::ops::Range"; | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | /* If we don't have an index type, just allocate this on the | |
1280 | arch. Here any type will do. */ | |
1281 | temp_type = (index_type == NULL | |
1282 | ? language_bool_type (exp->language_defn, exp->gdbarch) | |
1283 | : index_type); | |
1284 | /* It would be nicer to cache the range type. */ | |
1285 | range_type = rust_composite_type (temp_type, name, | |
1286 | low == NULL ? NULL : "start", index_type, | |
1287 | high == NULL ? NULL : "end", index_type); | |
1288 | ||
1289 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1290 | return value_zero (range_type, lval_memory); | |
1291 | ||
1292 | addrval = value_allocate_space_in_inferior (TYPE_LENGTH (range_type)); | |
1293 | addr = value_as_long (addrval); | |
1294 | result = value_at_lazy (range_type, addr); | |
1295 | ||
1296 | if (low != NULL) | |
1297 | { | |
1298 | struct value *start = value_struct_elt (&result, NULL, "start", NULL, | |
1299 | "range"); | |
1300 | ||
1301 | value_assign (start, low); | |
1302 | } | |
1303 | ||
1304 | if (high != NULL) | |
1305 | { | |
1306 | struct value *end = value_struct_elt (&result, NULL, "end", NULL, | |
1307 | "range"); | |
1308 | ||
1309 | value_assign (end, high); | |
1310 | } | |
1311 | ||
1312 | result = value_at_lazy (range_type, addr); | |
1313 | return result; | |
1314 | } | |
1315 | ||
1316 | /* A helper function to compute the range and kind given a range | |
1317 | value. TYPE is the type of the range value. RANGE is the range | |
1318 | value. LOW, HIGH, and KIND are out parameters. The LOW and HIGH | |
1319 | parameters might be filled in, or might not be, depending on the | |
1320 | kind of range this is. KIND will always be set to the appropriate | |
1321 | value describing the kind of range, and this can be used to | |
1322 | determine whether LOW or HIGH are valid. */ | |
1323 | ||
1324 | static void | |
1325 | rust_compute_range (struct type *type, struct value *range, | |
1326 | LONGEST *low, LONGEST *high, | |
01739a3b | 1327 | enum range_type *kind) |
c44af4eb TT |
1328 | { |
1329 | int i; | |
1330 | ||
1331 | *low = 0; | |
1332 | *high = 0; | |
1333 | *kind = BOTH_BOUND_DEFAULT; | |
1334 | ||
1335 | if (TYPE_NFIELDS (type) == 0) | |
1336 | return; | |
1337 | ||
1338 | i = 0; | |
1339 | if (strcmp (TYPE_FIELD_NAME (type, 0), "start") == 0) | |
1340 | { | |
1341 | *kind = HIGH_BOUND_DEFAULT; | |
1342 | *low = value_as_long (value_field (range, 0)); | |
1343 | ++i; | |
1344 | } | |
1345 | if (TYPE_NFIELDS (type) > i | |
1346 | && strcmp (TYPE_FIELD_NAME (type, i), "end") == 0) | |
1347 | { | |
1348 | *kind = (*kind == BOTH_BOUND_DEFAULT | |
1349 | ? LOW_BOUND_DEFAULT : NONE_BOUND_DEFAULT); | |
1350 | *high = value_as_long (value_field (range, i)); | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | /* A helper for rust_evaluate_subexp that handles BINOP_SUBSCRIPT. */ | |
1355 | ||
1356 | static struct value * | |
1357 | rust_subscript (struct expression *exp, int *pos, enum noside noside, | |
1358 | int for_addr) | |
1359 | { | |
1360 | struct value *lhs, *rhs, *result; | |
1361 | struct type *rhstype; | |
45f4ed92 | 1362 | LONGEST low, high_bound; |
c44af4eb | 1363 | /* Initialized to appease the compiler. */ |
01739a3b | 1364 | enum range_type kind = BOTH_BOUND_DEFAULT; |
45f4ed92 | 1365 | LONGEST high = 0; |
c44af4eb TT |
1366 | int want_slice = 0; |
1367 | ||
1368 | ++*pos; | |
1369 | lhs = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1370 | rhs = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1371 | ||
1372 | if (noside == EVAL_SKIP) | |
1373 | return lhs; | |
1374 | ||
1375 | rhstype = check_typedef (value_type (rhs)); | |
1376 | if (rust_range_type_p (rhstype)) | |
1377 | { | |
1378 | if (!for_addr) | |
1379 | error (_("Can't take slice of array without '&'")); | |
1380 | rust_compute_range (rhstype, rhs, &low, &high, &kind); | |
1381 | want_slice = 1; | |
1382 | } | |
1383 | else | |
1384 | low = value_as_long (rhs); | |
1385 | ||
1386 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1387 | { | |
1388 | struct type *type = check_typedef (value_type (lhs)); | |
1389 | ||
1390 | result = value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (lhs)); | |
1391 | } | |
1392 | else | |
1393 | { | |
1394 | LONGEST low_bound; | |
1395 | struct value *base; | |
1396 | struct type *type = check_typedef (value_type (lhs)); | |
1397 | ||
1398 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) | |
1399 | { | |
1400 | base = lhs; | |
1401 | if (!get_array_bounds (type, &low_bound, &high_bound)) | |
1402 | error (_("Can't compute array bounds")); | |
1403 | if (low_bound != 0) | |
1404 | error (_("Found array with non-zero lower bound")); | |
1405 | ++high_bound; | |
1406 | } | |
1407 | else if (rust_slice_type_p (type)) | |
1408 | { | |
1409 | struct value *len; | |
1410 | ||
1411 | base = value_struct_elt (&lhs, NULL, "data_ptr", NULL, "slice"); | |
1412 | len = value_struct_elt (&lhs, NULL, "length", NULL, "slice"); | |
1413 | low_bound = 0; | |
1414 | high_bound = value_as_long (len); | |
1415 | } | |
1416 | else | |
1417 | error (_("Cannot subscript non-array type")); | |
1418 | ||
1419 | if (want_slice | |
1420 | && (kind == BOTH_BOUND_DEFAULT || kind == LOW_BOUND_DEFAULT)) | |
1421 | low = low_bound; | |
1422 | if (low < 0) | |
1423 | error (_("Index less than zero")); | |
1424 | if (low > high_bound) | |
1425 | error (_("Index greater than length")); | |
1426 | ||
1427 | result = value_subscript (base, low); | |
1428 | } | |
1429 | ||
1430 | if (for_addr) | |
1431 | { | |
1432 | if (want_slice) | |
1433 | { | |
1434 | struct type *usize, *slice; | |
1435 | CORE_ADDR addr; | |
1436 | struct value *addrval, *tem; | |
1437 | ||
1438 | if (kind == BOTH_BOUND_DEFAULT || kind == HIGH_BOUND_DEFAULT) | |
1439 | high = high_bound; | |
1440 | if (high < 0) | |
1441 | error (_("High index less than zero")); | |
1442 | if (low > high) | |
1443 | error (_("Low index greater than high index")); | |
1444 | if (high > high_bound) | |
1445 | error (_("High index greater than length")); | |
1446 | ||
1447 | usize = language_lookup_primitive_type (exp->language_defn, | |
1448 | exp->gdbarch, | |
1449 | "usize"); | |
1450 | slice = rust_slice_type ("&[*gdb*]", value_type (result), | |
1451 | usize); | |
1452 | ||
1453 | addrval = value_allocate_space_in_inferior (TYPE_LENGTH (slice)); | |
1454 | addr = value_as_long (addrval); | |
1455 | tem = value_at_lazy (slice, addr); | |
1456 | ||
1457 | value_assign (value_field (tem, 0), value_addr (result)); | |
1458 | value_assign (value_field (tem, 1), | |
1459 | value_from_longest (usize, high - low)); | |
1460 | ||
1461 | result = value_at_lazy (slice, addr); | |
1462 | } | |
1463 | else | |
1464 | result = value_addr (result); | |
1465 | } | |
1466 | ||
1467 | return result; | |
1468 | } | |
1469 | ||
1470 | /* evaluate_exp implementation for Rust. */ | |
1471 | ||
1472 | static struct value * | |
1473 | rust_evaluate_subexp (struct type *expect_type, struct expression *exp, | |
1474 | int *pos, enum noside noside) | |
1475 | { | |
1476 | struct value *result; | |
1477 | ||
1478 | switch (exp->elts[*pos].opcode) | |
1479 | { | |
1480 | case UNOP_COMPLEMENT: | |
1481 | { | |
1482 | struct value *value; | |
1483 | ||
1484 | ++*pos; | |
1485 | value = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1486 | if (noside == EVAL_SKIP) | |
1487 | { | |
1488 | /* Preserving the type is enough. */ | |
1489 | return value; | |
1490 | } | |
1491 | if (TYPE_CODE (value_type (value)) == TYPE_CODE_BOOL) | |
1492 | result = value_from_longest (value_type (value), | |
1493 | value_logical_not (value)); | |
1494 | else | |
1495 | result = value_complement (value); | |
1496 | } | |
1497 | break; | |
1498 | ||
1499 | case BINOP_SUBSCRIPT: | |
1500 | result = rust_subscript (exp, pos, noside, 0); | |
1501 | break; | |
1502 | ||
1503 | case OP_FUNCALL: | |
1504 | result = rust_evaluate_funcall (exp, pos, noside); | |
1505 | break; | |
1506 | ||
1507 | case OP_AGGREGATE: | |
1508 | { | |
1509 | int pc = (*pos)++; | |
1510 | struct type *type = exp->elts[pc + 1].type; | |
1511 | int arglen = longest_to_int (exp->elts[pc + 2].longconst); | |
1512 | int i; | |
1513 | CORE_ADDR addr = 0; | |
1514 | struct value *addrval = NULL; | |
1515 | ||
1516 | *pos += 3; | |
1517 | ||
1518 | if (noside == EVAL_NORMAL) | |
1519 | { | |
1520 | addrval = value_allocate_space_in_inferior (TYPE_LENGTH (type)); | |
1521 | addr = value_as_long (addrval); | |
1522 | result = value_at_lazy (type, addr); | |
1523 | } | |
1524 | ||
1525 | if (arglen > 0 && exp->elts[*pos].opcode == OP_OTHERS) | |
1526 | { | |
1527 | struct value *init; | |
1528 | ||
1529 | ++*pos; | |
1530 | init = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1531 | if (noside == EVAL_NORMAL) | |
1532 | { | |
1533 | /* This isn't quite right but will do for the time | |
1534 | being, seeing that we can't implement the Copy | |
1535 | trait anyway. */ | |
1536 | value_assign (result, init); | |
1537 | } | |
1538 | ||
1539 | --arglen; | |
1540 | } | |
1541 | ||
1542 | gdb_assert (arglen % 2 == 0); | |
1543 | for (i = 0; i < arglen; i += 2) | |
1544 | { | |
1545 | int len; | |
1546 | const char *fieldname; | |
1547 | struct value *value, *field; | |
1548 | ||
1549 | gdb_assert (exp->elts[*pos].opcode == OP_NAME); | |
1550 | ++*pos; | |
1551 | len = longest_to_int (exp->elts[*pos].longconst); | |
1552 | ++*pos; | |
1553 | fieldname = &exp->elts[*pos].string; | |
1554 | *pos += 2 + BYTES_TO_EXP_ELEM (len + 1); | |
1555 | ||
1556 | value = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1557 | if (noside == EVAL_NORMAL) | |
1558 | { | |
1559 | field = value_struct_elt (&result, NULL, fieldname, NULL, | |
1560 | "structure"); | |
1561 | value_assign (field, value); | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | if (noside == EVAL_SKIP) | |
1566 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, | |
1567 | 1); | |
1568 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1569 | result = allocate_value (type); | |
1570 | else | |
1571 | result = value_at_lazy (type, addr); | |
1572 | } | |
1573 | break; | |
1574 | ||
1575 | case OP_RUST_ARRAY: | |
1576 | { | |
1577 | int pc = (*pos)++; | |
1578 | int copies; | |
1579 | struct value *elt; | |
1580 | struct value *ncopies; | |
1581 | ||
1582 | elt = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1583 | ncopies = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1584 | copies = value_as_long (ncopies); | |
1585 | if (copies < 0) | |
1586 | error (_("Array with negative number of elements")); | |
1587 | ||
1588 | if (noside == EVAL_NORMAL) | |
1589 | { | |
1590 | CORE_ADDR addr; | |
1591 | int i; | |
1592 | struct value **eltvec = XNEWVEC (struct value *, copies); | |
1593 | struct cleanup *cleanup = make_cleanup (xfree, eltvec); | |
1594 | ||
1595 | for (i = 0; i < copies; ++i) | |
1596 | eltvec[i] = elt; | |
1597 | result = value_array (0, copies - 1, eltvec); | |
1598 | ||
1599 | do_cleanups (cleanup); | |
1600 | } | |
1601 | else | |
1602 | { | |
1603 | struct type *arraytype | |
1604 | = lookup_array_range_type (value_type (elt), 0, copies - 1); | |
1605 | result = allocate_value (arraytype); | |
1606 | } | |
1607 | } | |
1608 | break; | |
1609 | ||
1610 | case STRUCTOP_ANONYMOUS: | |
1611 | { | |
1612 | /* Anonymous field access, i.e. foo.1. */ | |
1613 | struct value *lhs; | |
1614 | int pc, field_number, nfields; | |
1615 | struct type *type, *variant_type; | |
1616 | struct disr_info disr; | |
1617 | ||
1618 | pc = (*pos)++; | |
1619 | field_number = longest_to_int (exp->elts[pc + 1].longconst); | |
1620 | (*pos) += 2; | |
1621 | lhs = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1622 | ||
1623 | type = value_type (lhs); | |
1624 | if (TYPE_CODE (type) == TYPE_CODE_UNION) | |
1625 | { | |
1626 | struct cleanup *cleanup; | |
1627 | ||
1628 | disr = rust_get_disr_info (type, value_contents (lhs), | |
1629 | value_embedded_offset (lhs), | |
1630 | value_address (lhs), lhs); | |
1631 | ||
1632 | cleanup = make_cleanup (xfree, disr.name); | |
1633 | ||
1634 | if (disr.is_encoded && disr.field_no == RUST_ENCODED_ENUM_HIDDEN) | |
1635 | { | |
1636 | variant_type = NULL; | |
1637 | nfields = 0; | |
1638 | } | |
1639 | else | |
1640 | { | |
1641 | variant_type = TYPE_FIELD_TYPE (type, disr.field_no); | |
1642 | nfields = TYPE_NFIELDS (variant_type); | |
1643 | } | |
1644 | ||
1645 | if (!disr.is_encoded) | |
1646 | ++field_number; | |
1647 | ||
1648 | if (field_number >= nfields || field_number < 0) | |
1649 | error(_("Cannot access field %d of variant %s, \ | |
1650 | there are only %d fields"), | |
1651 | disr.is_encoded ? field_number : field_number - 1, | |
1652 | disr.name, | |
1653 | disr.is_encoded ? nfields : nfields - 1); | |
1654 | ||
1655 | if (!(disr.is_encoded | |
1656 | ? rust_tuple_struct_type_p (variant_type) | |
1657 | : rust_tuple_variant_type_p (variant_type))) | |
1658 | error(_("Variant %s is not a tuple variant"), disr.name); | |
1659 | ||
1660 | result = value_primitive_field (lhs, 0, field_number, | |
1661 | variant_type); | |
1662 | do_cleanups (cleanup); | |
1663 | } | |
1664 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) | |
1665 | { | |
1666 | /* Tuples and tuple structs */ | |
1667 | nfields = TYPE_NFIELDS(type); | |
1668 | ||
1669 | if (field_number >= nfields || field_number < 0) | |
1670 | error(_("Cannot access field %d of %s, there are only %d fields"), | |
1671 | field_number, TYPE_TAG_NAME (type), nfields); | |
1672 | ||
1673 | /* Tuples are tuple structs too. */ | |
1674 | if (!rust_tuple_struct_type_p (type)) | |
1675 | error(_("Attempting to access anonymous field %d of %s, which is \ | |
1676 | not a tuple, tuple struct, or tuple-like variant"), | |
1677 | field_number, TYPE_TAG_NAME (type)); | |
1678 | ||
1679 | result = value_primitive_field (lhs, 0, field_number, type); | |
1680 | } | |
1681 | else | |
1682 | error(_("Anonymous field access is only allowed on tuples, \ | |
1683 | tuple structs, and tuple-like enum variants")); | |
1684 | } | |
1685 | break; | |
1686 | ||
1687 | case STRUCTOP_STRUCT: | |
1688 | { | |
1689 | struct value* lhs; | |
1690 | struct type *type; | |
1691 | int tem, pc; | |
1692 | ||
1693 | pc = (*pos)++; | |
1694 | tem = longest_to_int (exp->elts[pc + 1].longconst); | |
1695 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); | |
1696 | lhs = evaluate_subexp (NULL_TYPE, exp, pos, noside); | |
1697 | ||
1698 | type = value_type (lhs); | |
1699 | ||
1700 | if (TYPE_CODE (type) == TYPE_CODE_UNION) | |
1701 | { | |
1702 | int i, start; | |
1703 | struct disr_info disr; | |
1704 | struct cleanup* cleanup; | |
1705 | struct type* variant_type; | |
1706 | char* field_name; | |
1707 | ||
1708 | field_name = &exp->elts[pc + 2].string; | |
1709 | ||
1710 | disr = rust_get_disr_info (type, value_contents (lhs), | |
1711 | value_embedded_offset (lhs), | |
1712 | value_address (lhs), lhs); | |
1713 | ||
1714 | cleanup = make_cleanup (xfree, disr.name); | |
1715 | ||
1716 | if (disr.is_encoded && disr.field_no == RUST_ENCODED_ENUM_HIDDEN) | |
1717 | error(_("Could not find field %s of struct variant %s"), | |
1718 | field_name, disr.name); | |
1719 | ||
1720 | variant_type = TYPE_FIELD_TYPE (type, disr.field_no); | |
1721 | ||
1722 | if (variant_type == NULL | |
1723 | || rust_tuple_variant_type_p (variant_type)) | |
1724 | error(_("Attempting to access named field %s of tuple variant %s, \ | |
1725 | which has only anonymous fields"), | |
1726 | field_name, disr.name); | |
1727 | ||
1728 | start = disr.is_encoded ? 0 : 1; | |
1729 | for (i = start; i < TYPE_NFIELDS (variant_type); i++) | |
1730 | { | |
1731 | if (strcmp (TYPE_FIELD_NAME (variant_type, i), | |
1732 | field_name) == 0) { | |
1733 | result = value_primitive_field (lhs, 0, i, variant_type); | |
1734 | break; | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | if (i == TYPE_NFIELDS (variant_type)) | |
1739 | /* We didn't find it. */ | |
1740 | error(_("Could not find field %s of struct variant %s"), | |
1741 | field_name, disr.name); | |
1742 | ||
1743 | do_cleanups (cleanup); | |
1744 | } | |
1745 | else | |
1746 | { | |
1747 | *pos = pc; | |
1748 | result = evaluate_subexp_standard (expect_type, exp, pos, noside); | |
1749 | } | |
1750 | } | |
1751 | break; | |
1752 | ||
01739a3b | 1753 | case OP_RANGE: |
c44af4eb TT |
1754 | result = rust_range (exp, pos, noside); |
1755 | break; | |
1756 | ||
1757 | case UNOP_ADDR: | |
1758 | /* We might have &array[range], in which case we need to make a | |
1759 | slice. */ | |
1760 | if (exp->elts[*pos + 1].opcode == BINOP_SUBSCRIPT) | |
1761 | { | |
1762 | ++*pos; | |
1763 | result = rust_subscript (exp, pos, noside, 1); | |
1764 | break; | |
1765 | } | |
1766 | /* Fall through. */ | |
1767 | default: | |
1768 | result = evaluate_subexp_standard (expect_type, exp, pos, noside); | |
1769 | break; | |
1770 | } | |
1771 | ||
1772 | return result; | |
1773 | } | |
1774 | ||
1775 | /* operator_length implementation for Rust. */ | |
1776 | ||
1777 | static void | |
1778 | rust_operator_length (const struct expression *exp, int pc, int *oplenp, | |
1779 | int *argsp) | |
1780 | { | |
1781 | int oplen = 1; | |
1782 | int args = 0; | |
1783 | ||
1784 | switch (exp->elts[pc - 1].opcode) | |
1785 | { | |
1786 | case OP_AGGREGATE: | |
1787 | /* We handle aggregate as a type and argument count. The first | |
1788 | argument might be OP_OTHERS. After that the arguments | |
1789 | alternate: first an OP_NAME, then an expression. */ | |
1790 | oplen = 4; | |
1791 | args = longest_to_int (exp->elts[pc - 2].longconst); | |
1792 | break; | |
1793 | ||
1794 | case OP_OTHERS: | |
1795 | oplen = 1; | |
1796 | args = 1; | |
1797 | break; | |
1798 | ||
1799 | case STRUCTOP_ANONYMOUS: | |
1800 | oplen = 3; | |
1801 | args = 1; | |
1802 | break; | |
1803 | ||
1804 | case OP_RUST_ARRAY: | |
1805 | oplen = 1; | |
1806 | args = 2; | |
1807 | break; | |
1808 | ||
1809 | default: | |
1810 | operator_length_standard (exp, pc, oplenp, argsp); | |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | *oplenp = oplen; | |
1815 | *argsp = args; | |
1816 | } | |
1817 | ||
1818 | /* op_name implementation for Rust. */ | |
1819 | ||
1820 | static char * | |
1821 | rust_op_name (enum exp_opcode opcode) | |
1822 | { | |
1823 | switch (opcode) | |
1824 | { | |
1825 | case OP_AGGREGATE: | |
1826 | return "OP_AGGREGATE"; | |
1827 | case OP_OTHERS: | |
1828 | return "OP_OTHERS"; | |
1829 | default: | |
1830 | return op_name_standard (opcode); | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | /* dump_subexp_body implementation for Rust. */ | |
1835 | ||
1836 | static int | |
1837 | rust_dump_subexp_body (struct expression *exp, struct ui_file *stream, | |
1838 | int elt) | |
1839 | { | |
1840 | switch (exp->elts[elt].opcode) | |
1841 | { | |
1842 | case OP_AGGREGATE: | |
1843 | { | |
1844 | int length = longest_to_int (exp->elts[elt + 2].longconst); | |
1845 | int i; | |
1846 | ||
1847 | fprintf_filtered (stream, "Type @"); | |
1848 | gdb_print_host_address (exp->elts[elt + 1].type, stream); | |
1849 | fprintf_filtered (stream, " ("); | |
1850 | type_print (exp->elts[elt + 1].type, NULL, stream, 0); | |
1851 | fprintf_filtered (stream, "), length %d", length); | |
1852 | ||
1853 | elt += 4; | |
1854 | for (i = 0; i < length; ++i) | |
1855 | elt = dump_subexp (exp, stream, elt); | |
1856 | } | |
1857 | break; | |
1858 | ||
1859 | case OP_STRING: | |
1860 | case OP_NAME: | |
1861 | { | |
1862 | LONGEST len = exp->elts[elt + 1].longconst; | |
1863 | ||
1864 | fprintf_filtered (stream, "%s: %s", | |
1865 | (exp->elts[elt].opcode == OP_STRING | |
1866 | ? "string" : "name"), | |
1867 | &exp->elts[elt + 2].string); | |
1868 | elt += 4 + BYTES_TO_EXP_ELEM (len + 1); | |
1869 | } | |
1870 | break; | |
1871 | ||
1872 | case OP_OTHERS: | |
1873 | elt = dump_subexp (exp, stream, elt + 1); | |
1874 | break; | |
1875 | ||
1876 | case STRUCTOP_ANONYMOUS: | |
1877 | { | |
1878 | int field_number; | |
1879 | ||
1880 | field_number = longest_to_int (exp->elts[elt].longconst); | |
1881 | ||
1882 | fprintf_filtered (stream, "Field number: %d", field_number); | |
1883 | elt = dump_subexp (exp, stream, elt + 2); | |
1884 | } | |
1885 | break; | |
1886 | ||
1887 | case OP_RUST_ARRAY: | |
1888 | break; | |
1889 | ||
1890 | default: | |
1891 | elt = dump_subexp_body_standard (exp, stream, elt); | |
1892 | break; | |
1893 | } | |
1894 | ||
1895 | return elt; | |
1896 | } | |
1897 | ||
1898 | /* print_subexp implementation for Rust. */ | |
1899 | ||
1900 | static void | |
1901 | rust_print_subexp (struct expression *exp, int *pos, struct ui_file *stream, | |
1902 | enum precedence prec) | |
1903 | { | |
1904 | switch (exp->elts[*pos].opcode) | |
1905 | { | |
1906 | case OP_AGGREGATE: | |
1907 | { | |
1908 | int length = longest_to_int (exp->elts[*pos + 2].longconst); | |
1909 | int i; | |
1910 | ||
1911 | type_print (exp->elts[*pos + 1].type, "", stream, 0); | |
1912 | fputs_filtered (" { ", stream); | |
1913 | ||
1914 | *pos += 4; | |
1915 | for (i = 0; i < length; ++i) | |
1916 | { | |
1917 | rust_print_subexp (exp, pos, stream, prec); | |
1918 | fputs_filtered (", ", stream); | |
1919 | } | |
1920 | fputs_filtered (" }", stream); | |
1921 | } | |
1922 | break; | |
1923 | ||
1924 | case OP_NAME: | |
1925 | { | |
1926 | LONGEST len = exp->elts[*pos + 1].longconst; | |
1927 | ||
1928 | fputs_filtered (&exp->elts[*pos + 2].string, stream); | |
1929 | *pos += 4 + BYTES_TO_EXP_ELEM (len + 1); | |
1930 | } | |
1931 | break; | |
1932 | ||
1933 | case OP_OTHERS: | |
1934 | { | |
1935 | fputs_filtered ("<<others>> (", stream); | |
1936 | ++*pos; | |
1937 | rust_print_subexp (exp, pos, stream, prec); | |
1938 | fputs_filtered (")", stream); | |
1939 | } | |
1940 | break; | |
1941 | ||
1942 | case STRUCTOP_ANONYMOUS: | |
1943 | { | |
1944 | int tem = longest_to_int (exp->elts[*pos + 1].longconst); | |
1945 | ||
1946 | (*pos) += 3; | |
1947 | print_subexp (exp, pos, stream, PREC_SUFFIX); | |
1948 | fprintf_filtered (stream, ".%d", tem); | |
1949 | } | |
1950 | return; | |
1951 | ||
1952 | case OP_RUST_ARRAY: | |
1953 | ++*pos; | |
1954 | fprintf_filtered (stream, "["); | |
1955 | rust_print_subexp (exp, pos, stream, prec); | |
1956 | fprintf_filtered (stream, "; "); | |
1957 | rust_print_subexp (exp, pos, stream, prec); | |
1958 | fprintf_filtered (stream, "]"); | |
1959 | break; | |
1960 | ||
1961 | default: | |
1962 | print_subexp_standard (exp, pos, stream, prec); | |
1963 | break; | |
1964 | } | |
1965 | } | |
1966 | ||
1967 | /* operator_check implementation for Rust. */ | |
1968 | ||
1969 | static int | |
1970 | rust_operator_check (struct expression *exp, int pos, | |
1971 | int (*objfile_func) (struct objfile *objfile, | |
1972 | void *data), | |
1973 | void *data) | |
1974 | { | |
1975 | switch (exp->elts[pos].opcode) | |
1976 | { | |
1977 | case OP_AGGREGATE: | |
1978 | { | |
1979 | struct type *type = exp->elts[pos + 1].type; | |
1980 | struct objfile *objfile = TYPE_OBJFILE (type); | |
1981 | ||
1982 | if (objfile != NULL && (*objfile_func) (objfile, data)) | |
1983 | return 1; | |
1984 | } | |
1985 | break; | |
1986 | ||
1987 | case OP_OTHERS: | |
1988 | case OP_NAME: | |
1989 | case OP_RUST_ARRAY: | |
1990 | break; | |
1991 | ||
1992 | default: | |
1993 | return operator_check_standard (exp, pos, objfile_func, data); | |
1994 | } | |
1995 | ||
1996 | return 0; | |
1997 | } | |
1998 | ||
1999 | \f | |
2000 | ||
2001 | /* Implementation of la_lookup_symbol_nonlocal for Rust. */ | |
2002 | ||
2003 | static struct block_symbol | |
2004 | rust_lookup_symbol_nonlocal (const struct language_defn *langdef, | |
2005 | const char *name, | |
2006 | const struct block *block, | |
2007 | const domain_enum domain) | |
2008 | { | |
2009 | struct block_symbol result = {NULL, NULL}; | |
2010 | ||
2011 | if (symbol_lookup_debug) | |
2012 | { | |
2013 | fprintf_unfiltered (gdb_stdlog, | |
2014 | "rust_lookup_symbol_non_local" | |
2015 | " (%s, %s (scope %s), %s)\n", | |
2016 | name, host_address_to_string (block), | |
2017 | block_scope (block), domain_name (domain)); | |
2018 | } | |
2019 | ||
2020 | /* Look up bare names in the block's scope. */ | |
2021 | if (name[cp_find_first_component (name)] == '\0') | |
2022 | { | |
2023 | const char *scope = block_scope (block); | |
2024 | ||
2025 | if (scope[0] != '\0') | |
2026 | { | |
2027 | char *scopedname = concat (scope, "::", name, (char *) NULL); | |
2028 | struct cleanup *cleanup = make_cleanup (xfree, scopedname); | |
2029 | ||
2030 | result = lookup_symbol_in_static_block (scopedname, block, | |
2031 | domain); | |
2032 | if (result.symbol == NULL) | |
2033 | result = lookup_global_symbol (scopedname, block, domain); | |
2034 | do_cleanups (cleanup); | |
2035 | } | |
2036 | } | |
2037 | return result; | |
2038 | } | |
2039 | ||
2040 | \f | |
2041 | ||
8b302db8 TT |
2042 | /* la_sniff_from_mangled_name for Rust. */ |
2043 | ||
2044 | static int | |
2045 | rust_sniff_from_mangled_name (const char *mangled, char **demangled) | |
2046 | { | |
2047 | *demangled = gdb_demangle (mangled, DMGL_PARAMS | DMGL_ANSI); | |
2048 | return *demangled != NULL; | |
2049 | } | |
2050 | ||
2051 | \f | |
2052 | ||
c44af4eb TT |
2053 | static const struct exp_descriptor exp_descriptor_rust = |
2054 | { | |
2055 | rust_print_subexp, | |
2056 | rust_operator_length, | |
2057 | rust_operator_check, | |
2058 | rust_op_name, | |
2059 | rust_dump_subexp_body, | |
2060 | rust_evaluate_subexp | |
2061 | }; | |
2062 | ||
56618e20 TT |
2063 | static const char *rust_extensions[] = |
2064 | { | |
2065 | ".rs", NULL | |
2066 | }; | |
2067 | ||
c44af4eb TT |
2068 | static const struct language_defn rust_language_defn = |
2069 | { | |
2070 | "rust", | |
2071 | "Rust", | |
2072 | language_rust, | |
2073 | range_check_on, | |
2074 | case_sensitive_on, | |
2075 | array_row_major, | |
2076 | macro_expansion_no, | |
56618e20 | 2077 | rust_extensions, |
c44af4eb TT |
2078 | &exp_descriptor_rust, |
2079 | rust_parse, | |
2080 | rustyyerror, | |
2081 | null_post_parser, | |
2082 | rust_printchar, /* Print a character constant */ | |
2083 | rust_printstr, /* Function to print string constant */ | |
2084 | rust_emitchar, /* Print a single char */ | |
2085 | rust_print_type, /* Print a type using appropriate syntax */ | |
2086 | rust_print_typedef, /* Print a typedef using appropriate syntax */ | |
2087 | rust_val_print, /* Print a value using appropriate syntax */ | |
2088 | c_value_print, /* Print a top-level value */ | |
2089 | default_read_var_value, /* la_read_var_value */ | |
2090 | NULL, /* Language specific skip_trampoline */ | |
2091 | NULL, /* name_of_this */ | |
2092 | rust_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ | |
2093 | basic_lookup_transparent_type,/* lookup_transparent_type */ | |
2094 | gdb_demangle, /* Language specific symbol demangler */ | |
8b302db8 | 2095 | rust_sniff_from_mangled_name, |
c44af4eb TT |
2096 | NULL, /* Language specific |
2097 | class_name_from_physname */ | |
2098 | c_op_print_tab, /* expression operators for printing */ | |
2099 | 1, /* c-style arrays */ | |
2100 | 0, /* String lower bound */ | |
2101 | default_word_break_characters, | |
2102 | default_make_symbol_completion_list, | |
2103 | rust_language_arch_info, | |
2104 | default_print_array_index, | |
2105 | default_pass_by_reference, | |
2106 | c_get_string, | |
2107 | NULL, /* la_get_symbol_name_cmp */ | |
2108 | iterate_over_symbols, | |
2109 | &default_varobj_ops, | |
2110 | NULL, | |
2111 | NULL, | |
2112 | LANG_MAGIC | |
2113 | }; | |
2114 | ||
2115 | void | |
2116 | _initialize_rust_language (void) | |
2117 | { | |
2118 | add_language (&rust_language_defn); | |
2119 | } |