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c44af4eb TT |
1 | /* Rust language support routines for GDB, the GNU debugger. |
2 | ||
3666a048 | 3 | Copyright (C) 2016-2021 Free Software Foundation, Inc. |
c44af4eb TT |
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" | |
71a3c369 | 32 | #include "psymtab.h" |
c44af4eb | 33 | #include "rust-lang.h" |
a33ccfc7 | 34 | #include "typeprint.h" |
c44af4eb TT |
35 | #include "valprint.h" |
36 | #include "varobj.h" | |
a33ccfc7 | 37 | #include <algorithm> |
ab8b80a8 TT |
38 | #include <string> |
39 | #include <vector> | |
7f6aba03 | 40 | #include "cli/cli-style.h" |
af30c400 | 41 | #include "parser-defs.h" |
c44af4eb | 42 | |
c9317f21 | 43 | /* See rust-lang.h. */ |
c44af4eb | 44 | |
c9317f21 TT |
45 | const char * |
46 | rust_last_path_segment (const char *path) | |
c44af4eb TT |
47 | { |
48 | const char *result = strrchr (path, ':'); | |
49 | ||
50 | if (result == NULL) | |
c9317f21 | 51 | return path; |
c44af4eb TT |
52 | return result + 1; |
53 | } | |
54 | ||
03c85b11 | 55 | /* See rust-lang.h. */ |
c44af4eb | 56 | |
03c85b11 | 57 | std::string |
c44af4eb TT |
58 | rust_crate_for_block (const struct block *block) |
59 | { | |
60 | const char *scope = block_scope (block); | |
61 | ||
62 | if (scope[0] == '\0') | |
03c85b11 | 63 | return std::string (); |
c44af4eb | 64 | |
03c85b11 | 65 | return std::string (scope, cp_find_first_component (scope)); |
c44af4eb TT |
66 | } |
67 | ||
c9317f21 TT |
68 | /* Return true if TYPE, which must be a struct type, represents a Rust |
69 | enum. */ | |
c44af4eb | 70 | |
b96645f1 | 71 | static bool |
9c6a1327 | 72 | rust_enum_p (struct type *type) |
b96645f1 | 73 | { |
9c6a1327 TT |
74 | /* is_dynamic_type will return true if any field has a dynamic |
75 | attribute -- but we only want to check the top level. */ | |
76 | return TYPE_HAS_VARIANT_PARTS (type); | |
b96645f1 MG |
77 | } |
78 | ||
9c6a1327 TT |
79 | /* Return true if TYPE, which must be an already-resolved enum type, |
80 | has no variants. */ | |
098b2108 TT |
81 | |
82 | static bool | |
83 | rust_empty_enum_p (const struct type *type) | |
84 | { | |
1f704f76 | 85 | return type->num_fields () == 0; |
098b2108 TT |
86 | } |
87 | ||
9c6a1327 TT |
88 | /* Given an already-resolved enum type and contents, find which |
89 | variant is active. */ | |
c44af4eb | 90 | |
9c6a1327 TT |
91 | static int |
92 | rust_enum_variant (struct type *type) | |
c44af4eb | 93 | { |
9c6a1327 | 94 | /* The active variant is simply the first non-artificial field. */ |
1f704f76 | 95 | for (int i = 0; i < type->num_fields (); ++i) |
9c6a1327 TT |
96 | if (!TYPE_FIELD_ARTIFICIAL (type, i)) |
97 | return i; | |
c44af4eb | 98 | |
9c6a1327 TT |
99 | /* Perhaps we could get here by trying to print an Ada variant |
100 | record in Rust mode. Unlikely, but an error is safer than an | |
101 | assert. */ | |
102 | error (_("Could not find active enum variant")); | |
c44af4eb TT |
103 | } |
104 | ||
105 | /* See rust-lang.h. */ | |
106 | ||
65c40c95 | 107 | bool |
c44af4eb TT |
108 | rust_tuple_type_p (struct type *type) |
109 | { | |
110 | /* The current implementation is a bit of a hack, but there's | |
111 | nothing else in the debuginfo to distinguish a tuple from a | |
112 | struct. */ | |
78134374 | 113 | return (type->code () == TYPE_CODE_STRUCT |
7d93a1e0 SM |
114 | && type->name () != NULL |
115 | && type->name ()[0] == '('); | |
c44af4eb TT |
116 | } |
117 | ||
c44af4eb | 118 | /* Return true if all non-static fields of a structlike type are in a |
c9317f21 | 119 | sequence like __0, __1, __2. */ |
c44af4eb | 120 | |
65c40c95 | 121 | static bool |
c9317f21 | 122 | rust_underscore_fields (struct type *type) |
c44af4eb TT |
123 | { |
124 | int i, field_number; | |
125 | ||
126 | field_number = 0; | |
127 | ||
78134374 | 128 | if (type->code () != TYPE_CODE_STRUCT) |
65c40c95 | 129 | return false; |
1f704f76 | 130 | for (i = 0; i < type->num_fields (); ++i) |
c44af4eb | 131 | { |
ceacbf6e | 132 | if (!field_is_static (&type->field (i))) |
c44af4eb | 133 | { |
c9317f21 | 134 | char buf[20]; |
c44af4eb | 135 | |
c9317f21 TT |
136 | xsnprintf (buf, sizeof (buf), "__%d", field_number); |
137 | if (strcmp (buf, TYPE_FIELD_NAME (type, i)) != 0) | |
138 | return false; | |
139 | field_number++; | |
c44af4eb TT |
140 | } |
141 | } | |
65c40c95 | 142 | return true; |
c44af4eb TT |
143 | } |
144 | ||
145 | /* See rust-lang.h. */ | |
146 | ||
65c40c95 | 147 | bool |
c44af4eb TT |
148 | rust_tuple_struct_type_p (struct type *type) |
149 | { | |
12df5c00 TT |
150 | /* This is just an approximation until DWARF can represent Rust more |
151 | precisely. We exclude zero-length structs because they may not | |
152 | be tuple structs, and there's no way to tell. */ | |
1f704f76 | 153 | return type->num_fields () > 0 && rust_underscore_fields (type); |
c44af4eb TT |
154 | } |
155 | ||
156 | /* Return true if TYPE is a slice type, otherwise false. */ | |
157 | ||
65c40c95 | 158 | static bool |
c44af4eb TT |
159 | rust_slice_type_p (struct type *type) |
160 | { | |
78134374 | 161 | return (type->code () == TYPE_CODE_STRUCT |
7d93a1e0 SM |
162 | && type->name () != NULL |
163 | && (strncmp (type->name (), "&[", 2) == 0 | |
164 | || strcmp (type->name (), "&str") == 0)); | |
c44af4eb TT |
165 | } |
166 | ||
167 | /* Return true if TYPE is a range type, otherwise false. */ | |
168 | ||
65c40c95 | 169 | static bool |
c44af4eb TT |
170 | rust_range_type_p (struct type *type) |
171 | { | |
172 | int i; | |
173 | ||
78134374 | 174 | if (type->code () != TYPE_CODE_STRUCT |
1f704f76 | 175 | || type->num_fields () > 2 |
7d93a1e0 SM |
176 | || type->name () == NULL |
177 | || strstr (type->name (), "::Range") == NULL) | |
65c40c95 | 178 | return false; |
c44af4eb | 179 | |
1f704f76 | 180 | if (type->num_fields () == 0) |
65c40c95 | 181 | return true; |
c44af4eb TT |
182 | |
183 | i = 0; | |
184 | if (strcmp (TYPE_FIELD_NAME (type, 0), "start") == 0) | |
185 | { | |
1f704f76 | 186 | if (type->num_fields () == 1) |
65c40c95 | 187 | return true; |
c44af4eb TT |
188 | i = 1; |
189 | } | |
1f704f76 | 190 | else if (type->num_fields () == 2) |
c44af4eb TT |
191 | { |
192 | /* First field had to be "start". */ | |
65c40c95 | 193 | return false; |
c44af4eb TT |
194 | } |
195 | ||
196 | return strcmp (TYPE_FIELD_NAME (type, i), "end") == 0; | |
197 | } | |
198 | ||
6873858b TT |
199 | /* Return true if TYPE is an inclusive range type, otherwise false. |
200 | This is only valid for types which are already known to be range | |
201 | types. */ | |
202 | ||
203 | static bool | |
204 | rust_inclusive_range_type_p (struct type *type) | |
205 | { | |
7d93a1e0 SM |
206 | return (strstr (type->name (), "::RangeInclusive") != NULL |
207 | || strstr (type->name (), "::RangeToInclusive") != NULL); | |
6873858b TT |
208 | } |
209 | ||
c44af4eb TT |
210 | /* Return true if TYPE seems to be the type "u8", otherwise false. */ |
211 | ||
65c40c95 | 212 | static bool |
c44af4eb TT |
213 | rust_u8_type_p (struct type *type) |
214 | { | |
78134374 | 215 | return (type->code () == TYPE_CODE_INT |
c6d940a9 | 216 | && type->is_unsigned () |
c44af4eb TT |
217 | && TYPE_LENGTH (type) == 1); |
218 | } | |
219 | ||
220 | /* Return true if TYPE is a Rust character type. */ | |
221 | ||
65c40c95 | 222 | static bool |
c44af4eb TT |
223 | rust_chartype_p (struct type *type) |
224 | { | |
78134374 | 225 | return (type->code () == TYPE_CODE_CHAR |
c44af4eb | 226 | && TYPE_LENGTH (type) == 4 |
c6d940a9 | 227 | && type->is_unsigned ()); |
c44af4eb TT |
228 | } |
229 | ||
71a3c369 TT |
230 | /* If VALUE represents a trait object pointer, return the underlying |
231 | pointer with the correct (i.e., runtime) type. Otherwise, return | |
232 | NULL. */ | |
233 | ||
234 | static struct value * | |
235 | rust_get_trait_object_pointer (struct value *value) | |
236 | { | |
237 | struct type *type = check_typedef (value_type (value)); | |
238 | ||
1f704f76 | 239 | if (type->code () != TYPE_CODE_STRUCT || type->num_fields () != 2) |
71a3c369 TT |
240 | return NULL; |
241 | ||
242 | /* Try to be a bit resilient if the ABI changes. */ | |
243 | int vtable_field = 0; | |
244 | for (int i = 0; i < 2; ++i) | |
245 | { | |
246 | if (strcmp (TYPE_FIELD_NAME (type, i), "vtable") == 0) | |
247 | vtable_field = i; | |
248 | else if (strcmp (TYPE_FIELD_NAME (type, i), "pointer") != 0) | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | CORE_ADDR vtable = value_as_address (value_field (value, vtable_field)); | |
253 | struct symbol *symbol = find_symbol_at_address (vtable); | |
cf724bc9 | 254 | if (symbol == NULL || symbol->subclass != SYMBOL_RUST_VTABLE) |
71a3c369 TT |
255 | return NULL; |
256 | ||
257 | struct rust_vtable_symbol *vtable_sym | |
258 | = static_cast<struct rust_vtable_symbol *> (symbol); | |
259 | struct type *pointer_type = lookup_pointer_type (vtable_sym->concrete_type); | |
260 | return value_cast (pointer_type, value_field (value, 1 - vtable_field)); | |
261 | } | |
262 | ||
c44af4eb TT |
263 | \f |
264 | ||
1c485265 | 265 | /* See language.h. */ |
c44af4eb | 266 | |
1c485265 AB |
267 | void |
268 | rust_language::printstr (struct ui_file *stream, struct type *type, | |
269 | const gdb_byte *string, unsigned int length, | |
270 | const char *user_encoding, int force_ellipses, | |
271 | const struct value_print_options *options) const | |
c44af4eb TT |
272 | { |
273 | /* Rust always uses UTF-8, but let the caller override this if need | |
274 | be. */ | |
275 | const char *encoding = user_encoding; | |
276 | if (user_encoding == NULL || !*user_encoding) | |
277 | { | |
278 | /* In Rust strings, characters are "u8". */ | |
279 | if (rust_u8_type_p (type)) | |
280 | encoding = "UTF-8"; | |
281 | else | |
282 | { | |
283 | /* This is probably some C string, so let's let C deal with | |
284 | it. */ | |
285 | c_printstr (stream, type, string, length, user_encoding, | |
286 | force_ellipses, options); | |
287 | return; | |
288 | } | |
289 | } | |
290 | ||
291 | /* This is not ideal as it doesn't use our character printer. */ | |
292 | generic_printstr (stream, type, string, length, encoding, force_ellipses, | |
293 | '"', 0, options); | |
294 | } | |
295 | ||
296 | \f | |
297 | ||
45320ffa TT |
298 | /* Helper function to print a string slice. */ |
299 | ||
300 | static void | |
301 | rust_val_print_str (struct ui_file *stream, struct value *val, | |
302 | const struct value_print_options *options) | |
303 | { | |
304 | struct value *base = value_struct_elt (&val, NULL, "data_ptr", NULL, | |
305 | "slice"); | |
306 | struct value *len = value_struct_elt (&val, NULL, "length", NULL, "slice"); | |
307 | ||
308 | val_print_string (TYPE_TARGET_TYPE (value_type (base)), "UTF-8", | |
309 | value_as_address (base), value_as_long (len), stream, | |
310 | options); | |
311 | } | |
312 | ||
1c485265 | 313 | /* See rust-lang.h. */ |
b96645f1 | 314 | |
1c485265 AB |
315 | void |
316 | rust_language::val_print_struct | |
317 | (struct value *val, struct ui_file *stream, int recurse, | |
318 | const struct value_print_options *options) const | |
b96645f1 MG |
319 | { |
320 | int i; | |
321 | int first_field; | |
5f56f7cb | 322 | struct type *type = check_typedef (value_type (val)); |
45320ffa | 323 | |
7d93a1e0 | 324 | if (rust_slice_type_p (type) && strcmp (type->name (), "&str") == 0) |
45320ffa | 325 | { |
80062eb9 AB |
326 | /* If what we are printing here is actually a string within a |
327 | structure then VAL will be the original parent value, while TYPE | |
328 | will be the type of the structure representing the string we want | |
329 | to print. | |
330 | However, RUST_VAL_PRINT_STR looks up the fields of the string | |
331 | inside VAL, assuming that VAL is the string. | |
332 | So, recreate VAL as a value representing just the string. */ | |
5f56f7cb | 333 | val = value_at_lazy (type, value_address (val)); |
45320ffa TT |
334 | rust_val_print_str (stream, val, options); |
335 | return; | |
336 | } | |
337 | ||
65c40c95 TT |
338 | bool is_tuple = rust_tuple_type_p (type); |
339 | bool is_tuple_struct = !is_tuple && rust_tuple_struct_type_p (type); | |
b96645f1 MG |
340 | struct value_print_options opts; |
341 | ||
342 | if (!is_tuple) | |
343 | { | |
7d93a1e0 | 344 | if (type->name () != NULL) |
dda83cd7 | 345 | fprintf_filtered (stream, "%s", type->name ()); |
b96645f1 | 346 | |
1f704f76 | 347 | if (type->num_fields () == 0) |
dda83cd7 | 348 | return; |
b96645f1 | 349 | |
7d93a1e0 | 350 | if (type->name () != NULL) |
dda83cd7 | 351 | fputs_filtered (" ", stream); |
b96645f1 MG |
352 | } |
353 | ||
354 | if (is_tuple || is_tuple_struct) | |
355 | fputs_filtered ("(", stream); | |
356 | else | |
357 | fputs_filtered ("{", stream); | |
358 | ||
359 | opts = *options; | |
360 | opts.deref_ref = 0; | |
361 | ||
362 | first_field = 1; | |
1f704f76 | 363 | for (i = 0; i < type->num_fields (); ++i) |
b96645f1 | 364 | { |
ceacbf6e | 365 | if (field_is_static (&type->field (i))) |
dda83cd7 | 366 | continue; |
b96645f1 MG |
367 | |
368 | if (!first_field) | |
dda83cd7 | 369 | fputs_filtered (",", stream); |
b96645f1 MG |
370 | |
371 | if (options->prettyformat) | |
dda83cd7 | 372 | { |
b50f188d TT |
373 | fputs_filtered ("\n", stream); |
374 | print_spaces_filtered (2 + 2 * recurse, stream); | |
dda83cd7 | 375 | } |
b96645f1 | 376 | else if (!first_field) |
dda83cd7 | 377 | fputs_filtered (" ", stream); |
b96645f1 MG |
378 | |
379 | first_field = 0; | |
380 | ||
381 | if (!is_tuple && !is_tuple_struct) | |
dda83cd7 | 382 | { |
3f0cbb04 TT |
383 | fputs_styled (TYPE_FIELD_NAME (type, i), |
384 | variable_name_style.style (), stream); | |
b50f188d | 385 | fputs_filtered (": ", stream); |
dda83cd7 | 386 | } |
b96645f1 | 387 | |
1c485265 | 388 | value_print_inner (value_field (val, i), stream, recurse + 1, &opts); |
b96645f1 MG |
389 | } |
390 | ||
391 | if (options->prettyformat) | |
392 | { | |
393 | fputs_filtered ("\n", stream); | |
394 | print_spaces_filtered (2 * recurse, stream); | |
395 | } | |
396 | ||
397 | if (is_tuple || is_tuple_struct) | |
398 | fputs_filtered (")", stream); | |
399 | else | |
400 | fputs_filtered ("}", stream); | |
401 | } | |
402 | ||
1c485265 | 403 | /* See rust-lang.h. */ |
c9317f21 | 404 | |
1c485265 AB |
405 | void |
406 | rust_language::print_enum (struct value *val, struct ui_file *stream, | |
407 | int recurse, | |
408 | const struct value_print_options *options) const | |
c9317f21 TT |
409 | { |
410 | struct value_print_options opts = *options; | |
5f56f7cb | 411 | struct type *type = check_typedef (value_type (val)); |
c9317f21 TT |
412 | |
413 | opts.deref_ref = 0; | |
414 | ||
9c6a1327 TT |
415 | gdb_assert (rust_enum_p (type)); |
416 | gdb::array_view<const gdb_byte> view (value_contents_for_printing (val), | |
417 | TYPE_LENGTH (value_type (val))); | |
418 | type = resolve_dynamic_type (type, view, value_address (val)); | |
419 | ||
098b2108 TT |
420 | if (rust_empty_enum_p (type)) |
421 | { | |
422 | /* Print the enum type name here to be more clear. */ | |
7f6aba03 | 423 | fprintf_filtered (stream, _("%s {%p[<No data fields>%p]}"), |
7d93a1e0 | 424 | type->name (), |
7f6aba03 | 425 | metadata_style.style ().ptr (), nullptr); |
098b2108 TT |
426 | return; |
427 | } | |
428 | ||
9c6a1327 TT |
429 | int variant_fieldno = rust_enum_variant (type); |
430 | val = value_field (val, variant_fieldno); | |
940da03e | 431 | struct type *variant_type = type->field (variant_fieldno).type (); |
c9317f21 | 432 | |
1f704f76 | 433 | int nfields = variant_type->num_fields (); |
c9317f21 TT |
434 | |
435 | bool is_tuple = rust_tuple_struct_type_p (variant_type); | |
436 | ||
7d93a1e0 | 437 | fprintf_filtered (stream, "%s", variant_type->name ()); |
c9317f21 TT |
438 | if (nfields == 0) |
439 | { | |
440 | /* In case of a nullary variant like 'None', just output | |
441 | the name. */ | |
442 | return; | |
443 | } | |
444 | ||
445 | /* In case of a non-nullary variant, we output 'Foo(x,y,z)'. */ | |
446 | if (is_tuple) | |
447 | fprintf_filtered (stream, "("); | |
448 | else | |
449 | { | |
450 | /* struct variant. */ | |
451 | fprintf_filtered (stream, "{"); | |
452 | } | |
453 | ||
454 | bool first_field = true; | |
1f704f76 | 455 | for (int j = 0; j < variant_type->num_fields (); j++) |
c9317f21 TT |
456 | { |
457 | if (!first_field) | |
458 | fputs_filtered (", ", stream); | |
459 | first_field = false; | |
460 | ||
461 | if (!is_tuple) | |
3f0cbb04 TT |
462 | fprintf_filtered (stream, "%ps: ", |
463 | styled_string (variable_name_style.style (), | |
464 | TYPE_FIELD_NAME (variant_type, j))); | |
c9317f21 | 465 | |
1c485265 | 466 | value_print_inner (value_field (val, j), stream, recurse + 1, &opts); |
c9317f21 TT |
467 | } |
468 | ||
469 | if (is_tuple) | |
470 | fputs_filtered (")", stream); | |
471 | else | |
472 | fputs_filtered ("}", stream); | |
473 | } | |
474 | ||
c44af4eb TT |
475 | static const struct generic_val_print_decorations rust_decorations = |
476 | { | |
477 | /* Complex isn't used in Rust, but we provide C-ish values just in | |
478 | case. */ | |
479 | "", | |
480 | " + ", | |
481 | " * I", | |
482 | "true", | |
483 | "false", | |
921d8f54 | 484 | "()", |
c44af4eb TT |
485 | "[", |
486 | "]" | |
487 | }; | |
488 | ||
1c485265 AB |
489 | /* See language.h. */ |
490 | ||
491 | void | |
492 | rust_language::value_print_inner | |
493 | (struct value *val, struct ui_file *stream, int recurse, | |
494 | const struct value_print_options *options) const | |
5f56f7cb TT |
495 | { |
496 | struct value_print_options opts = *options; | |
497 | opts.deref_ref = 1; | |
498 | ||
499 | if (opts.prettyformat == Val_prettyformat_default) | |
500 | opts.prettyformat = (opts.prettyformat_structs | |
501 | ? Val_prettyformat : Val_no_prettyformat); | |
502 | ||
503 | struct type *type = check_typedef (value_type (val)); | |
78134374 | 504 | switch (type->code ()) |
c44af4eb TT |
505 | { |
506 | case TYPE_CODE_PTR: | |
507 | { | |
508 | LONGEST low_bound, high_bound; | |
509 | ||
78134374 | 510 | if (TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_ARRAY |
c44af4eb TT |
511 | && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type))) |
512 | && get_array_bounds (TYPE_TARGET_TYPE (type), &low_bound, | |
5f56f7cb TT |
513 | &high_bound)) |
514 | { | |
515 | /* We have a pointer to a byte string, so just print | |
516 | that. */ | |
517 | struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type)); | |
518 | CORE_ADDR addr = value_as_address (val); | |
8ee511af | 519 | struct gdbarch *arch = type->arch (); |
c44af4eb | 520 | |
5f56f7cb TT |
521 | if (opts.addressprint) |
522 | { | |
523 | fputs_filtered (paddress (arch, addr), stream); | |
524 | fputs_filtered (" ", stream); | |
525 | } | |
c44af4eb | 526 | |
5f56f7cb TT |
527 | fputs_filtered ("b", stream); |
528 | val_print_string (TYPE_TARGET_TYPE (elttype), "ASCII", addr, | |
529 | high_bound - low_bound + 1, stream, | |
530 | &opts); | |
531 | break; | |
532 | } | |
c44af4eb | 533 | } |
5f56f7cb | 534 | goto generic_print; |
c44af4eb | 535 | |
c44af4eb TT |
536 | case TYPE_CODE_INT: |
537 | /* Recognize the unit type. */ | |
c6d940a9 | 538 | if (type->is_unsigned () && TYPE_LENGTH (type) == 0 |
7d93a1e0 | 539 | && type->name () != NULL && strcmp (type->name (), "()") == 0) |
c44af4eb TT |
540 | { |
541 | fputs_filtered ("()", stream); | |
542 | break; | |
543 | } | |
544 | goto generic_print; | |
545 | ||
546 | case TYPE_CODE_STRING: | |
547 | { | |
c44af4eb TT |
548 | LONGEST low_bound, high_bound; |
549 | ||
550 | if (!get_array_bounds (type, &low_bound, &high_bound)) | |
551 | error (_("Could not determine the array bounds")); | |
552 | ||
553 | /* If we see a plain TYPE_CODE_STRING, then we're printing a | |
554 | byte string, hence the choice of "ASCII" as the | |
555 | encoding. */ | |
556 | fputs_filtered ("b", stream); | |
1c485265 AB |
557 | printstr (stream, TYPE_TARGET_TYPE (type), |
558 | value_contents_for_printing (val), | |
559 | high_bound - low_bound + 1, "ASCII", 0, &opts); | |
c44af4eb TT |
560 | } |
561 | break; | |
562 | ||
563 | case TYPE_CODE_ARRAY: | |
564 | { | |
565 | LONGEST low_bound, high_bound; | |
566 | ||
567 | if (get_array_bounds (type, &low_bound, &high_bound) | |
568 | && high_bound - low_bound + 1 == 0) | |
569 | fputs_filtered ("[]", stream); | |
570 | else | |
571 | goto generic_print; | |
572 | } | |
573 | break; | |
574 | ||
575 | case TYPE_CODE_UNION: | |
c9317f21 TT |
576 | /* Untagged unions are printed as if they are structs. Since |
577 | the field bit positions overlap in the debuginfo, the code | |
578 | for printing a union is same as that for a struct, the only | |
579 | difference is that the input type will have overlapping | |
580 | fields. */ | |
5f56f7cb | 581 | val_print_struct (val, stream, recurse, &opts); |
c44af4eb TT |
582 | break; |
583 | ||
584 | case TYPE_CODE_STRUCT: | |
c9317f21 | 585 | if (rust_enum_p (type)) |
1c485265 | 586 | print_enum (val, stream, recurse, &opts); |
c9317f21 | 587 | else |
5f56f7cb | 588 | val_print_struct (val, stream, recurse, &opts); |
b96645f1 | 589 | break; |
c44af4eb | 590 | |
b96645f1 MG |
591 | default: |
592 | generic_print: | |
593 | /* Nothing special yet. */ | |
5f56f7cb | 594 | generic_value_print (val, stream, recurse, &opts, &rust_decorations); |
b96645f1 MG |
595 | } |
596 | } | |
c44af4eb | 597 | |
b96645f1 | 598 | \f |
c44af4eb | 599 | |
b96645f1 | 600 | static void |
c9317f21 TT |
601 | rust_internal_print_type (struct type *type, const char *varstring, |
602 | struct ui_file *stream, int show, int level, | |
603 | const struct type_print_options *flags, | |
a33ccfc7 | 604 | bool for_rust_enum, print_offset_data *podata); |
b96645f1 MG |
605 | |
606 | /* Print a struct or union typedef. */ | |
607 | static void | |
608 | rust_print_struct_def (struct type *type, const char *varstring, | |
b50f188d | 609 | struct ui_file *stream, int show, int level, |
c9317f21 | 610 | const struct type_print_options *flags, |
a33ccfc7 | 611 | bool for_rust_enum, print_offset_data *podata) |
b96645f1 | 612 | { |
b50f188d TT |
613 | /* Print a tuple type simply. */ |
614 | if (rust_tuple_type_p (type)) | |
615 | { | |
7d93a1e0 | 616 | fputs_filtered (type->name (), stream); |
b50f188d TT |
617 | return; |
618 | } | |
c44af4eb | 619 | |
b50f188d TT |
620 | /* If we see a base class, delegate to C. */ |
621 | if (TYPE_N_BASECLASSES (type) > 0) | |
622 | c_print_type (type, varstring, stream, show, level, flags); | |
c44af4eb | 623 | |
a33ccfc7 TT |
624 | if (flags->print_offsets) |
625 | { | |
626 | /* Temporarily bump the level so that the output lines up | |
627 | correctly. */ | |
628 | level += 2; | |
629 | } | |
630 | ||
c9317f21 TT |
631 | /* Compute properties of TYPE here because, in the enum case, the |
632 | rest of the code ends up looking only at the variant part. */ | |
7d93a1e0 | 633 | const char *tagname = type->name (); |
c9317f21 TT |
634 | bool is_tuple_struct = rust_tuple_struct_type_p (type); |
635 | bool is_tuple = rust_tuple_type_p (type); | |
636 | bool is_enum = rust_enum_p (type); | |
b96645f1 | 637 | |
c9317f21 TT |
638 | if (for_rust_enum) |
639 | { | |
640 | /* Already printing an outer enum, so nothing to print here. */ | |
641 | } | |
642 | else | |
643 | { | |
644 | /* This code path is also used by unions and enums. */ | |
645 | if (is_enum) | |
646 | { | |
647 | fputs_filtered ("enum ", stream); | |
24e99c6c | 648 | dynamic_prop *prop = type->dyn_prop (DYN_PROP_VARIANT_PARTS); |
8c2e4e06 SM |
649 | if (prop != nullptr && prop->kind () == PROP_TYPE) |
650 | type = prop->original_type (); | |
c9317f21 | 651 | } |
78134374 | 652 | else if (type->code () == TYPE_CODE_STRUCT) |
c9317f21 TT |
653 | fputs_filtered ("struct ", stream); |
654 | else | |
655 | fputs_filtered ("union ", stream); | |
b96645f1 | 656 | |
c9317f21 TT |
657 | if (tagname != NULL) |
658 | fputs_filtered (tagname, stream); | |
659 | } | |
b96645f1 | 660 | |
1f704f76 | 661 | if (type->num_fields () == 0 && !is_tuple) |
b50f188d | 662 | return; |
a33ccfc7 | 663 | if (for_rust_enum && !flags->print_offsets) |
c9317f21 TT |
664 | fputs_filtered (is_tuple_struct ? "(" : "{", stream); |
665 | else | |
666 | fputs_filtered (is_tuple_struct ? " (\n" : " {\n", stream); | |
c44af4eb | 667 | |
a33ccfc7 TT |
668 | /* When printing offsets, we rearrange the fields into storage |
669 | order. This lets us show holes more clearly. We work using | |
670 | field indices here because it simplifies calls to | |
671 | print_offset_data::update below. */ | |
672 | std::vector<int> fields; | |
1f704f76 | 673 | for (int i = 0; i < type->num_fields (); ++i) |
b50f188d | 674 | { |
ceacbf6e | 675 | if (field_is_static (&type->field (i))) |
b50f188d | 676 | continue; |
9c6a1327 | 677 | if (is_enum && TYPE_FIELD_ARTIFICIAL (type, i)) |
a33ccfc7 TT |
678 | continue; |
679 | fields.push_back (i); | |
680 | } | |
681 | if (flags->print_offsets) | |
682 | std::sort (fields.begin (), fields.end (), | |
683 | [&] (int a, int b) | |
684 | { | |
685 | return (TYPE_FIELD_BITPOS (type, a) | |
686 | < TYPE_FIELD_BITPOS (type, b)); | |
687 | }); | |
688 | ||
689 | for (int i : fields) | |
690 | { | |
691 | QUIT; | |
692 | ||
ceacbf6e | 693 | gdb_assert (!field_is_static (&type->field (i))); |
9c6a1327 | 694 | gdb_assert (! (is_enum && TYPE_FIELD_ARTIFICIAL (type, i))); |
a33ccfc7 TT |
695 | |
696 | if (flags->print_offsets) | |
697 | podata->update (type, i, stream); | |
b50f188d TT |
698 | |
699 | /* We'd like to print "pub" here as needed, but rustc | |
700 | doesn't emit the debuginfo, and our types don't have | |
701 | cplus_struct_type attached. */ | |
702 | ||
703 | /* For a tuple struct we print the type but nothing | |
704 | else. */ | |
a33ccfc7 | 705 | if (!for_rust_enum || flags->print_offsets) |
c9317f21 TT |
706 | print_spaces_filtered (level + 2, stream); |
707 | if (is_enum) | |
3f0cbb04 TT |
708 | fputs_styled (TYPE_FIELD_NAME (type, i), variable_name_style.style (), |
709 | stream); | |
c9317f21 | 710 | else if (!is_tuple_struct) |
3f0cbb04 TT |
711 | fprintf_filtered (stream, "%ps: ", |
712 | styled_string (variable_name_style.style (), | |
713 | TYPE_FIELD_NAME (type, i))); | |
b50f188d | 714 | |
940da03e | 715 | rust_internal_print_type (type->field (i).type (), NULL, |
53d7df28 | 716 | stream, (is_enum ? show : show - 1), |
a33ccfc7 TT |
717 | level + 2, flags, is_enum, podata); |
718 | if (!for_rust_enum || flags->print_offsets) | |
c9317f21 | 719 | fputs_filtered (",\n", stream); |
a33ccfc7 TT |
720 | /* Note that this check of "I" is ok because we only sorted the |
721 | fields by offset when print_offsets was set, so we won't take | |
722 | this branch in that case. */ | |
1f704f76 | 723 | else if (i + 1 < type->num_fields ()) |
c9317f21 | 724 | fputs_filtered (", ", stream); |
b50f188d | 725 | } |
c44af4eb | 726 | |
a33ccfc7 TT |
727 | if (flags->print_offsets) |
728 | { | |
729 | /* Undo the temporary level increase we did above. */ | |
730 | level -= 2; | |
731 | podata->finish (type, level, stream); | |
732 | print_spaces_filtered (print_offset_data::indentation, stream); | |
733 | if (level == 0) | |
734 | print_spaces_filtered (2, stream); | |
735 | } | |
736 | if (!for_rust_enum || flags->print_offsets) | |
c9317f21 TT |
737 | print_spaces_filtered (level, stream); |
738 | fputs_filtered (is_tuple_struct ? ")" : "}", stream); | |
c44af4eb TT |
739 | } |
740 | ||
c44af4eb TT |
741 | /* la_print_type implementation for Rust. */ |
742 | ||
743 | static void | |
c9317f21 TT |
744 | rust_internal_print_type (struct type *type, const char *varstring, |
745 | struct ui_file *stream, int show, int level, | |
746 | const struct type_print_options *flags, | |
a33ccfc7 | 747 | bool for_rust_enum, print_offset_data *podata) |
c44af4eb | 748 | { |
c44af4eb TT |
749 | QUIT; |
750 | if (show <= 0 | |
7d93a1e0 | 751 | && type->name () != NULL) |
c44af4eb | 752 | { |
921d8f54 | 753 | /* Rust calls the unit type "void" in its debuginfo, |
dda83cd7 | 754 | but we don't want to print it as that. */ |
78134374 | 755 | if (type->code () == TYPE_CODE_VOID) |
dda83cd7 | 756 | fputs_filtered ("()", stream); |
921d8f54 | 757 | else |
dda83cd7 | 758 | fputs_filtered (type->name (), stream); |
c44af4eb TT |
759 | return; |
760 | } | |
761 | ||
762 | type = check_typedef (type); | |
78134374 | 763 | switch (type->code ()) |
c44af4eb | 764 | { |
921d8f54 | 765 | case TYPE_CODE_VOID: |
c9317f21 TT |
766 | /* If we have an enum, we've already printed the type's |
767 | unqualified name, and there is nothing else to print | |
768 | here. */ | |
769 | if (!for_rust_enum) | |
770 | fputs_filtered ("()", stream); | |
921d8f54 MG |
771 | break; |
772 | ||
c44af4eb TT |
773 | case TYPE_CODE_FUNC: |
774 | /* Delegate varargs to the C printer. */ | |
a409645d | 775 | if (type->has_varargs ()) |
c44af4eb TT |
776 | goto c_printer; |
777 | ||
778 | fputs_filtered ("fn ", stream); | |
779 | if (varstring != NULL) | |
780 | fputs_filtered (varstring, stream); | |
781 | fputs_filtered ("(", stream); | |
1f704f76 | 782 | for (int i = 0; i < type->num_fields (); ++i) |
c44af4eb TT |
783 | { |
784 | QUIT; | |
785 | if (i > 0) | |
786 | fputs_filtered (", ", stream); | |
940da03e | 787 | rust_internal_print_type (type->field (i).type (), "", stream, |
a33ccfc7 | 788 | -1, 0, flags, false, podata); |
c44af4eb | 789 | } |
921d8f54 MG |
790 | fputs_filtered (")", stream); |
791 | /* If it returns unit, we can omit the return type. */ | |
78134374 | 792 | if (TYPE_TARGET_TYPE (type)->code () != TYPE_CODE_VOID) |
dda83cd7 SM |
793 | { |
794 | fputs_filtered (" -> ", stream); | |
795 | rust_internal_print_type (TYPE_TARGET_TYPE (type), "", stream, | |
a33ccfc7 | 796 | -1, 0, flags, false, podata); |
dda83cd7 | 797 | } |
c44af4eb TT |
798 | break; |
799 | ||
800 | case TYPE_CODE_ARRAY: | |
801 | { | |
802 | LONGEST low_bound, high_bound; | |
803 | ||
804 | fputs_filtered ("[", stream); | |
c9317f21 | 805 | rust_internal_print_type (TYPE_TARGET_TYPE (type), NULL, |
a33ccfc7 TT |
806 | stream, show - 1, level, flags, false, |
807 | podata); | |
c44af4eb | 808 | |
cf88be68 SM |
809 | if (type->bounds ()->high.kind () == PROP_LOCEXPR |
810 | || type->bounds ()->high.kind () == PROP_LOCLIST) | |
e6cf65f2 | 811 | fprintf_filtered (stream, "; variable length"); |
c44af4eb | 812 | else if (get_array_bounds (type, &low_bound, &high_bound)) |
e6cf65f2 | 813 | fprintf_filtered (stream, "; %s", |
c44af4eb TT |
814 | plongest (high_bound - low_bound + 1)); |
815 | fputs_filtered ("]", stream); | |
816 | } | |
817 | break; | |
818 | ||
c9317f21 | 819 | case TYPE_CODE_UNION: |
c44af4eb | 820 | case TYPE_CODE_STRUCT: |
c9317f21 | 821 | rust_print_struct_def (type, varstring, stream, show, level, flags, |
a33ccfc7 | 822 | for_rust_enum, podata); |
c44af4eb TT |
823 | break; |
824 | ||
825 | case TYPE_CODE_ENUM: | |
826 | { | |
b926417a | 827 | int len = 0; |
c44af4eb TT |
828 | |
829 | fputs_filtered ("enum ", stream); | |
7d93a1e0 | 830 | if (type->name () != NULL) |
c44af4eb | 831 | { |
7d93a1e0 | 832 | fputs_filtered (type->name (), stream); |
c44af4eb | 833 | fputs_filtered (" ", stream); |
7d93a1e0 | 834 | len = strlen (type->name ()); |
c44af4eb TT |
835 | } |
836 | fputs_filtered ("{\n", stream); | |
837 | ||
1f704f76 | 838 | for (int i = 0; i < type->num_fields (); ++i) |
c44af4eb TT |
839 | { |
840 | const char *name = TYPE_FIELD_NAME (type, i); | |
841 | ||
842 | QUIT; | |
843 | ||
844 | if (len > 0 | |
7d93a1e0 | 845 | && strncmp (name, type->name (), len) == 0 |
c44af4eb TT |
846 | && name[len] == ':' |
847 | && name[len + 1] == ':') | |
848 | name += len + 2; | |
32f47895 TT |
849 | fprintf_filtered (stream, "%*s%ps,\n", |
850 | level + 2, "", | |
851 | styled_string (variable_name_style.style (), | |
852 | name)); | |
c44af4eb TT |
853 | } |
854 | ||
855 | fputs_filtered ("}", stream); | |
856 | } | |
73fc52c4 TT |
857 | break; |
858 | ||
859 | case TYPE_CODE_PTR: | |
860 | { | |
7d93a1e0 SM |
861 | if (type->name () != nullptr) |
862 | fputs_filtered (type->name (), stream); | |
73fc52c4 TT |
863 | else |
864 | { | |
865 | /* We currently can't distinguish between pointers and | |
866 | references. */ | |
867 | fputs_filtered ("*mut ", stream); | |
868 | type_print (TYPE_TARGET_TYPE (type), "", stream, 0); | |
869 | } | |
870 | } | |
c44af4eb TT |
871 | break; |
872 | ||
c44af4eb TT |
873 | default: |
874 | c_printer: | |
875 | c_print_type (type, varstring, stream, show, level, flags); | |
876 | } | |
877 | } | |
878 | ||
879 | \f | |
880 | ||
c44af4eb TT |
881 | /* Like arch_composite_type, but uses TYPE to decide how to allocate |
882 | -- either on an obstack or on a gdbarch. */ | |
883 | ||
884 | static struct type * | |
885 | rust_composite_type (struct type *original, | |
886 | const char *name, | |
887 | const char *field1, struct type *type1, | |
888 | const char *field2, struct type *type2) | |
889 | { | |
890 | struct type *result = alloc_type_copy (original); | |
891 | int i, nfields, bitpos; | |
892 | ||
893 | nfields = 0; | |
894 | if (field1 != NULL) | |
895 | ++nfields; | |
896 | if (field2 != NULL) | |
897 | ++nfields; | |
898 | ||
67607e24 | 899 | result->set_code (TYPE_CODE_STRUCT); |
d0e39ea2 | 900 | result->set_name (name); |
c44af4eb | 901 | |
5e33d5f4 | 902 | result->set_num_fields (nfields); |
3cabb6b0 SM |
903 | result->set_fields |
904 | ((struct field *) TYPE_ZALLOC (result, nfields * sizeof (struct field))); | |
c44af4eb TT |
905 | |
906 | i = 0; | |
907 | bitpos = 0; | |
908 | if (field1 != NULL) | |
909 | { | |
ceacbf6e | 910 | struct field *field = &result->field (i); |
c44af4eb TT |
911 | |
912 | SET_FIELD_BITPOS (*field, bitpos); | |
913 | bitpos += TYPE_LENGTH (type1) * TARGET_CHAR_BIT; | |
914 | ||
915 | FIELD_NAME (*field) = field1; | |
5d14b6e5 | 916 | field->set_type (type1); |
c44af4eb TT |
917 | ++i; |
918 | } | |
919 | if (field2 != NULL) | |
920 | { | |
ceacbf6e | 921 | struct field *field = &result->field (i); |
2fff16dd | 922 | unsigned align = type_align (type2); |
c44af4eb TT |
923 | |
924 | if (align != 0) | |
925 | { | |
926 | int delta; | |
927 | ||
928 | align *= TARGET_CHAR_BIT; | |
929 | delta = bitpos % align; | |
930 | if (delta != 0) | |
931 | bitpos += align - delta; | |
932 | } | |
933 | SET_FIELD_BITPOS (*field, bitpos); | |
934 | ||
935 | FIELD_NAME (*field) = field2; | |
5d14b6e5 | 936 | field->set_type (type2); |
c44af4eb TT |
937 | ++i; |
938 | } | |
939 | ||
940 | if (i > 0) | |
941 | TYPE_LENGTH (result) | |
942 | = (TYPE_FIELD_BITPOS (result, i - 1) / TARGET_CHAR_BIT + | |
940da03e | 943 | TYPE_LENGTH (result->field (i - 1).type ())); |
c44af4eb TT |
944 | return result; |
945 | } | |
946 | ||
947 | /* See rust-lang.h. */ | |
948 | ||
949 | struct type * | |
950 | rust_slice_type (const char *name, struct type *elt_type, | |
951 | struct type *usize_type) | |
952 | { | |
953 | struct type *type; | |
954 | ||
955 | elt_type = lookup_pointer_type (elt_type); | |
956 | type = rust_composite_type (elt_type, name, | |
957 | "data_ptr", elt_type, | |
958 | "length", usize_type); | |
959 | ||
960 | return type; | |
961 | } | |
962 | ||
c44af4eb TT |
963 | \f |
964 | ||
965 | /* A helper for rust_evaluate_subexp that handles OP_FUNCALL. */ | |
966 | ||
967 | static struct value * | |
968 | rust_evaluate_funcall (struct expression *exp, int *pos, enum noside noside) | |
969 | { | |
970 | int i; | |
971 | int num_args = exp->elts[*pos + 1].longconst; | |
972 | const char *method; | |
c44af4eb | 973 | struct value *function, *result, *arg0; |
c44af4eb TT |
974 | struct type *type, *fn_type; |
975 | const struct block *block; | |
976 | struct block_symbol sym; | |
977 | ||
978 | /* For an ordinary function call we can simply defer to the | |
979 | generic implementation. */ | |
980 | if (exp->elts[*pos + 3].opcode != STRUCTOP_STRUCT) | |
981 | return evaluate_subexp_standard (NULL, exp, pos, noside); | |
982 | ||
983 | /* Skip over the OP_FUNCALL and the STRUCTOP_STRUCT. */ | |
984 | *pos += 4; | |
985 | method = &exp->elts[*pos + 1].string; | |
986 | *pos += 3 + BYTES_TO_EXP_ELEM (exp->elts[*pos].longconst + 1); | |
987 | ||
988 | /* Evaluate the argument to STRUCTOP_STRUCT, then find its | |
989 | type in order to look up the method. */ | |
fe1fe7ea | 990 | arg0 = evaluate_subexp (nullptr, exp, pos, noside); |
c44af4eb TT |
991 | |
992 | if (noside == EVAL_SKIP) | |
993 | { | |
994 | for (i = 0; i < num_args; ++i) | |
fe1fe7ea | 995 | evaluate_subexp (nullptr, exp, pos, noside); |
c44af4eb TT |
996 | return arg0; |
997 | } | |
998 | ||
ab8b80a8 | 999 | std::vector<struct value *> args (num_args + 1); |
c44af4eb TT |
1000 | args[0] = arg0; |
1001 | ||
1002 | /* We don't yet implement real Deref semantics. */ | |
78134374 | 1003 | while (value_type (args[0])->code () == TYPE_CODE_PTR) |
c44af4eb TT |
1004 | args[0] = value_ind (args[0]); |
1005 | ||
1006 | type = value_type (args[0]); | |
78134374 SM |
1007 | if ((type->code () != TYPE_CODE_STRUCT |
1008 | && type->code () != TYPE_CODE_UNION | |
1009 | && type->code () != TYPE_CODE_ENUM) | |
c44af4eb TT |
1010 | || rust_tuple_type_p (type)) |
1011 | error (_("Method calls only supported on struct or enum types")); | |
7d93a1e0 | 1012 | if (type->name () == NULL) |
c44af4eb TT |
1013 | error (_("Method call on nameless type")); |
1014 | ||
7d93a1e0 | 1015 | std::string name = std::string (type->name ()) + "::" + method; |
c44af4eb TT |
1016 | |
1017 | block = get_selected_block (0); | |
ab8b80a8 | 1018 | sym = lookup_symbol (name.c_str (), block, VAR_DOMAIN, NULL); |
c44af4eb | 1019 | if (sym.symbol == NULL) |
ab8b80a8 | 1020 | error (_("Could not find function named '%s'"), name.c_str ()); |
c44af4eb TT |
1021 | |
1022 | fn_type = SYMBOL_TYPE (sym.symbol); | |
1f704f76 | 1023 | if (fn_type->num_fields () == 0) |
ab8b80a8 | 1024 | error (_("Function '%s' takes no arguments"), name.c_str ()); |
c44af4eb | 1025 | |
940da03e | 1026 | if (fn_type->field (0).type ()->code () == TYPE_CODE_PTR) |
c44af4eb TT |
1027 | args[0] = value_addr (args[0]); |
1028 | ||
1029 | function = address_of_variable (sym.symbol, block); | |
1030 | ||
1031 | for (i = 0; i < num_args; ++i) | |
fe1fe7ea | 1032 | args[i + 1] = evaluate_subexp (nullptr, exp, pos, noside); |
c44af4eb TT |
1033 | |
1034 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1035 | result = value_zero (TYPE_TARGET_TYPE (fn_type), not_lval); | |
1036 | else | |
e71585ff | 1037 | result = call_function_by_hand (function, NULL, args); |
c44af4eb TT |
1038 | return result; |
1039 | } | |
1040 | ||
01739a3b | 1041 | /* A helper for rust_evaluate_subexp that handles OP_RANGE. */ |
c44af4eb TT |
1042 | |
1043 | static struct value * | |
d148f803 TT |
1044 | rust_range (struct type *expect_type, struct expression *exp, |
1045 | enum noside noside, enum range_flag kind, | |
1046 | struct value *low, struct value *high) | |
c44af4eb | 1047 | { |
c44af4eb TT |
1048 | struct value *addrval, *result; |
1049 | CORE_ADDR addr; | |
1050 | struct type *range_type; | |
1051 | struct type *index_type; | |
1052 | struct type *temp_type; | |
1053 | const char *name; | |
1054 | ||
2f1b18db | 1055 | bool inclusive = !(kind & RANGE_HIGH_BOUND_EXCLUSIVE); |
c44af4eb TT |
1056 | |
1057 | if (noside == EVAL_SKIP) | |
1058 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); | |
1059 | ||
1060 | if (low == NULL) | |
1061 | { | |
1062 | if (high == NULL) | |
1063 | { | |
1064 | index_type = NULL; | |
1065 | name = "std::ops::RangeFull"; | |
1066 | } | |
1067 | else | |
1068 | { | |
1069 | index_type = value_type (high); | |
6873858b TT |
1070 | name = (inclusive |
1071 | ? "std::ops::RangeToInclusive" : "std::ops::RangeTo"); | |
c44af4eb TT |
1072 | } |
1073 | } | |
1074 | else | |
1075 | { | |
1076 | if (high == NULL) | |
1077 | { | |
1078 | index_type = value_type (low); | |
1079 | name = "std::ops::RangeFrom"; | |
1080 | } | |
1081 | else | |
1082 | { | |
1083 | if (!types_equal (value_type (low), value_type (high))) | |
1084 | error (_("Range expression with different types")); | |
1085 | index_type = value_type (low); | |
6873858b | 1086 | name = inclusive ? "std::ops::RangeInclusive" : "std::ops::Range"; |
c44af4eb TT |
1087 | } |
1088 | } | |
1089 | ||
1090 | /* If we don't have an index type, just allocate this on the | |
1091 | arch. Here any type will do. */ | |
1092 | temp_type = (index_type == NULL | |
1093 | ? language_bool_type (exp->language_defn, exp->gdbarch) | |
1094 | : index_type); | |
1095 | /* It would be nicer to cache the range type. */ | |
1096 | range_type = rust_composite_type (temp_type, name, | |
1097 | low == NULL ? NULL : "start", index_type, | |
1098 | high == NULL ? NULL : "end", index_type); | |
1099 | ||
1100 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1101 | return value_zero (range_type, lval_memory); | |
1102 | ||
1103 | addrval = value_allocate_space_in_inferior (TYPE_LENGTH (range_type)); | |
1104 | addr = value_as_long (addrval); | |
1105 | result = value_at_lazy (range_type, addr); | |
1106 | ||
1107 | if (low != NULL) | |
1108 | { | |
1109 | struct value *start = value_struct_elt (&result, NULL, "start", NULL, | |
1110 | "range"); | |
1111 | ||
1112 | value_assign (start, low); | |
1113 | } | |
1114 | ||
1115 | if (high != NULL) | |
1116 | { | |
1117 | struct value *end = value_struct_elt (&result, NULL, "end", NULL, | |
1118 | "range"); | |
1119 | ||
1120 | value_assign (end, high); | |
1121 | } | |
1122 | ||
1123 | result = value_at_lazy (range_type, addr); | |
1124 | return result; | |
1125 | } | |
1126 | ||
1127 | /* A helper function to compute the range and kind given a range | |
1128 | value. TYPE is the type of the range value. RANGE is the range | |
1129 | value. LOW, HIGH, and KIND are out parameters. The LOW and HIGH | |
1130 | parameters might be filled in, or might not be, depending on the | |
1131 | kind of range this is. KIND will always be set to the appropriate | |
1132 | value describing the kind of range, and this can be used to | |
1133 | determine whether LOW or HIGH are valid. */ | |
1134 | ||
1135 | static void | |
1136 | rust_compute_range (struct type *type, struct value *range, | |
1137 | LONGEST *low, LONGEST *high, | |
f2d8e4c5 | 1138 | range_flags *kind) |
c44af4eb TT |
1139 | { |
1140 | int i; | |
1141 | ||
1142 | *low = 0; | |
1143 | *high = 0; | |
2f1b18db | 1144 | *kind = RANGE_LOW_BOUND_DEFAULT | RANGE_HIGH_BOUND_DEFAULT; |
c44af4eb | 1145 | |
1f704f76 | 1146 | if (type->num_fields () == 0) |
c44af4eb TT |
1147 | return; |
1148 | ||
1149 | i = 0; | |
1150 | if (strcmp (TYPE_FIELD_NAME (type, 0), "start") == 0) | |
1151 | { | |
2f1b18db | 1152 | *kind = RANGE_HIGH_BOUND_DEFAULT; |
c44af4eb TT |
1153 | *low = value_as_long (value_field (range, 0)); |
1154 | ++i; | |
1155 | } | |
1f704f76 | 1156 | if (type->num_fields () > i |
c44af4eb TT |
1157 | && strcmp (TYPE_FIELD_NAME (type, i), "end") == 0) |
1158 | { | |
2f1b18db AB |
1159 | *kind = (*kind == (RANGE_LOW_BOUND_DEFAULT | RANGE_HIGH_BOUND_DEFAULT) |
1160 | ? RANGE_LOW_BOUND_DEFAULT : RANGE_STANDARD); | |
c44af4eb | 1161 | *high = value_as_long (value_field (range, i)); |
6873858b TT |
1162 | |
1163 | if (rust_inclusive_range_type_p (type)) | |
1164 | ++*high; | |
c44af4eb TT |
1165 | } |
1166 | } | |
1167 | ||
1168 | /* A helper for rust_evaluate_subexp that handles BINOP_SUBSCRIPT. */ | |
1169 | ||
1170 | static struct value * | |
984af2cb TT |
1171 | rust_subscript (struct type *expect_type, struct expression *exp, |
1172 | enum noside noside, bool for_addr, | |
1173 | struct value *lhs, struct value *rhs) | |
c44af4eb | 1174 | { |
984af2cb | 1175 | struct value *result; |
c44af4eb | 1176 | struct type *rhstype; |
45f4ed92 | 1177 | LONGEST low, high_bound; |
c44af4eb | 1178 | /* Initialized to appease the compiler. */ |
f2d8e4c5 | 1179 | range_flags kind = RANGE_LOW_BOUND_DEFAULT | RANGE_HIGH_BOUND_DEFAULT; |
45f4ed92 | 1180 | LONGEST high = 0; |
c44af4eb TT |
1181 | int want_slice = 0; |
1182 | ||
c44af4eb TT |
1183 | if (noside == EVAL_SKIP) |
1184 | return lhs; | |
1185 | ||
1186 | rhstype = check_typedef (value_type (rhs)); | |
1187 | if (rust_range_type_p (rhstype)) | |
1188 | { | |
1189 | if (!for_addr) | |
1190 | error (_("Can't take slice of array without '&'")); | |
1191 | rust_compute_range (rhstype, rhs, &low, &high, &kind); | |
1192 | want_slice = 1; | |
1193 | } | |
1194 | else | |
1195 | low = value_as_long (rhs); | |
1196 | ||
b3e3859b | 1197 | struct type *type = check_typedef (value_type (lhs)); |
c44af4eb TT |
1198 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
1199 | { | |
b3e3859b | 1200 | struct type *base_type = nullptr; |
78134374 | 1201 | if (type->code () == TYPE_CODE_ARRAY) |
b3e3859b TT |
1202 | base_type = TYPE_TARGET_TYPE (type); |
1203 | else if (rust_slice_type_p (type)) | |
1204 | { | |
1f704f76 | 1205 | for (int i = 0; i < type->num_fields (); ++i) |
b3e3859b TT |
1206 | { |
1207 | if (strcmp (TYPE_FIELD_NAME (type, i), "data_ptr") == 0) | |
1208 | { | |
940da03e | 1209 | base_type = TYPE_TARGET_TYPE (type->field (i).type ()); |
b3e3859b TT |
1210 | break; |
1211 | } | |
1212 | } | |
1213 | if (base_type == nullptr) | |
1214 | error (_("Could not find 'data_ptr' in slice type")); | |
1215 | } | |
78134374 | 1216 | else if (type->code () == TYPE_CODE_PTR) |
b3e3859b TT |
1217 | base_type = TYPE_TARGET_TYPE (type); |
1218 | else | |
1219 | error (_("Cannot subscript non-array type")); | |
1220 | ||
1221 | struct type *new_type; | |
1222 | if (want_slice) | |
1223 | { | |
1224 | if (rust_slice_type_p (type)) | |
1225 | new_type = type; | |
1226 | else | |
1227 | { | |
1228 | struct type *usize | |
1229 | = language_lookup_primitive_type (exp->language_defn, | |
1230 | exp->gdbarch, | |
1231 | "usize"); | |
1232 | new_type = rust_slice_type ("&[*gdb*]", base_type, usize); | |
1233 | } | |
1234 | } | |
1235 | else | |
1236 | new_type = base_type; | |
c44af4eb | 1237 | |
b3e3859b | 1238 | return value_zero (new_type, VALUE_LVAL (lhs)); |
c44af4eb TT |
1239 | } |
1240 | else | |
1241 | { | |
1242 | LONGEST low_bound; | |
1243 | struct value *base; | |
c44af4eb | 1244 | |
78134374 | 1245 | if (type->code () == TYPE_CODE_ARRAY) |
c44af4eb TT |
1246 | { |
1247 | base = lhs; | |
1248 | if (!get_array_bounds (type, &low_bound, &high_bound)) | |
1249 | error (_("Can't compute array bounds")); | |
1250 | if (low_bound != 0) | |
1251 | error (_("Found array with non-zero lower bound")); | |
1252 | ++high_bound; | |
1253 | } | |
1254 | else if (rust_slice_type_p (type)) | |
1255 | { | |
1256 | struct value *len; | |
1257 | ||
1258 | base = value_struct_elt (&lhs, NULL, "data_ptr", NULL, "slice"); | |
1259 | len = value_struct_elt (&lhs, NULL, "length", NULL, "slice"); | |
1260 | low_bound = 0; | |
1261 | high_bound = value_as_long (len); | |
1262 | } | |
78134374 | 1263 | else if (type->code () == TYPE_CODE_PTR) |
42d94011 MG |
1264 | { |
1265 | base = lhs; | |
1266 | low_bound = 0; | |
1267 | high_bound = LONGEST_MAX; | |
1268 | } | |
c44af4eb TT |
1269 | else |
1270 | error (_("Cannot subscript non-array type")); | |
1271 | ||
2f1b18db | 1272 | if (want_slice && (kind & RANGE_LOW_BOUND_DEFAULT)) |
c44af4eb TT |
1273 | low = low_bound; |
1274 | if (low < 0) | |
1275 | error (_("Index less than zero")); | |
1276 | if (low > high_bound) | |
1277 | error (_("Index greater than length")); | |
1278 | ||
1279 | result = value_subscript (base, low); | |
1280 | } | |
1281 | ||
1282 | if (for_addr) | |
1283 | { | |
1284 | if (want_slice) | |
1285 | { | |
1286 | struct type *usize, *slice; | |
1287 | CORE_ADDR addr; | |
1288 | struct value *addrval, *tem; | |
1289 | ||
2f1b18db | 1290 | if (kind & RANGE_HIGH_BOUND_DEFAULT) |
c44af4eb TT |
1291 | high = high_bound; |
1292 | if (high < 0) | |
1293 | error (_("High index less than zero")); | |
1294 | if (low > high) | |
1295 | error (_("Low index greater than high index")); | |
1296 | if (high > high_bound) | |
1297 | error (_("High index greater than length")); | |
1298 | ||
1299 | usize = language_lookup_primitive_type (exp->language_defn, | |
1300 | exp->gdbarch, | |
1301 | "usize"); | |
45320ffa TT |
1302 | const char *new_name = ((type != nullptr |
1303 | && rust_slice_type_p (type)) | |
7d93a1e0 | 1304 | ? type->name () : "&[*gdb*]"); |
45320ffa TT |
1305 | |
1306 | slice = rust_slice_type (new_name, value_type (result), usize); | |
c44af4eb TT |
1307 | |
1308 | addrval = value_allocate_space_in_inferior (TYPE_LENGTH (slice)); | |
1309 | addr = value_as_long (addrval); | |
1310 | tem = value_at_lazy (slice, addr); | |
1311 | ||
1312 | value_assign (value_field (tem, 0), value_addr (result)); | |
1313 | value_assign (value_field (tem, 1), | |
1314 | value_from_longest (usize, high - low)); | |
1315 | ||
1316 | result = value_at_lazy (slice, addr); | |
1317 | } | |
1318 | else | |
1319 | result = value_addr (result); | |
1320 | } | |
1321 | ||
1322 | return result; | |
1323 | } | |
1324 | ||
d123f9e4 TT |
1325 | /* A helper function for UNOP_IND. */ |
1326 | ||
1327 | static struct value * | |
1328 | eval_op_rust_ind (struct type *expect_type, struct expression *exp, | |
1329 | enum noside noside, | |
1330 | struct value *value) | |
1331 | { | |
1332 | gdb_assert (noside == EVAL_NORMAL); | |
1333 | struct value *trait_ptr = rust_get_trait_object_pointer (value); | |
1334 | if (trait_ptr != NULL) | |
1335 | value = trait_ptr; | |
1336 | ||
1337 | return value_ind (value); | |
1338 | } | |
1339 | ||
6fa9831f TT |
1340 | /* A helper function for UNOP_COMPLEMENT. */ |
1341 | ||
1342 | static struct value * | |
1343 | eval_op_rust_complement (struct type *expect_type, struct expression *exp, | |
1344 | enum noside noside, | |
1345 | struct value *value) | |
1346 | { | |
1347 | if (noside == EVAL_SKIP) | |
1348 | { | |
1349 | /* Preserving the type is enough. */ | |
1350 | return value; | |
1351 | } | |
1352 | if (value_type (value)->code () == TYPE_CODE_BOOL) | |
1353 | return value_from_longest (value_type (value), value_logical_not (value)); | |
1354 | return value_complement (value); | |
1355 | } | |
1356 | ||
05104233 TT |
1357 | /* A helper function for OP_ARRAY. */ |
1358 | ||
1359 | static struct value * | |
1360 | eval_op_rust_array (struct type *expect_type, struct expression *exp, | |
1361 | enum noside noside, | |
1362 | struct value *elt, struct value *ncopies) | |
1363 | { | |
1364 | int copies = value_as_long (ncopies); | |
1365 | if (copies < 0) | |
1366 | error (_("Array with negative number of elements")); | |
1367 | ||
1368 | if (noside == EVAL_NORMAL) | |
1369 | { | |
1370 | int i; | |
1371 | std::vector<struct value *> eltvec (copies); | |
1372 | ||
1373 | for (i = 0; i < copies; ++i) | |
1374 | eltvec[i] = elt; | |
1375 | return value_array (0, copies - 1, eltvec.data ()); | |
1376 | } | |
1377 | else | |
1378 | { | |
1379 | struct type *arraytype | |
1380 | = lookup_array_range_type (value_type (elt), 0, copies - 1); | |
1381 | return allocate_value (arraytype); | |
1382 | } | |
1383 | } | |
1384 | ||
575cae23 TT |
1385 | /* A helper function for STRUCTOP_ANONYMOUS. */ |
1386 | ||
1387 | static struct value * | |
1388 | eval_op_rust_struct_anon (struct type *expect_type, struct expression *exp, | |
1389 | enum noside noside, | |
1390 | int field_number, struct value *lhs) | |
1391 | { | |
1392 | struct type *type = value_type (lhs); | |
1393 | ||
1394 | if (type->code () == TYPE_CODE_STRUCT) | |
1395 | { | |
1396 | struct type *outer_type = NULL; | |
1397 | ||
1398 | if (rust_enum_p (type)) | |
1399 | { | |
1400 | gdb::array_view<const gdb_byte> view (value_contents (lhs), | |
1401 | TYPE_LENGTH (type)); | |
1402 | type = resolve_dynamic_type (type, view, value_address (lhs)); | |
1403 | ||
1404 | if (rust_empty_enum_p (type)) | |
1405 | error (_("Cannot access field %d of empty enum %s"), | |
1406 | field_number, type->name ()); | |
1407 | ||
1408 | int fieldno = rust_enum_variant (type); | |
1409 | lhs = value_primitive_field (lhs, 0, fieldno, type); | |
1410 | outer_type = type; | |
1411 | type = value_type (lhs); | |
1412 | } | |
1413 | ||
1414 | /* Tuples and tuple structs */ | |
1415 | int nfields = type->num_fields (); | |
1416 | ||
1417 | if (field_number >= nfields || field_number < 0) | |
1418 | { | |
1419 | if (outer_type != NULL) | |
1420 | error(_("Cannot access field %d of variant %s::%s, " | |
1421 | "there are only %d fields"), | |
1422 | field_number, outer_type->name (), | |
1423 | rust_last_path_segment (type->name ()), | |
1424 | nfields); | |
1425 | else | |
1426 | error(_("Cannot access field %d of %s, " | |
1427 | "there are only %d fields"), | |
1428 | field_number, type->name (), nfields); | |
1429 | } | |
1430 | ||
1431 | /* Tuples are tuple structs too. */ | |
1432 | if (!rust_tuple_struct_type_p (type)) | |
1433 | { | |
1434 | if (outer_type != NULL) | |
1435 | error(_("Variant %s::%s is not a tuple variant"), | |
1436 | outer_type->name (), | |
1437 | rust_last_path_segment (type->name ())); | |
1438 | else | |
1439 | error(_("Attempting to access anonymous field %d " | |
1440 | "of %s, which is not a tuple, tuple struct, or " | |
1441 | "tuple-like variant"), | |
1442 | field_number, type->name ()); | |
1443 | } | |
1444 | ||
1445 | return value_primitive_field (lhs, 0, field_number, type); | |
1446 | } | |
1447 | else | |
1448 | error(_("Anonymous field access is only allowed on tuples, \ | |
1449 | tuple structs, and tuple-like enum variants")); | |
1450 | } | |
1451 | ||
1fa41fc7 TT |
1452 | /* A helper function for STRUCTOP_STRUCT. */ |
1453 | ||
1454 | static struct value * | |
1455 | eval_op_rust_structop (struct type *expect_type, struct expression *exp, | |
1456 | enum noside noside, | |
1457 | struct value *lhs, const char *field_name) | |
1458 | { | |
1459 | struct value *result; | |
1460 | struct type *type = value_type (lhs); | |
1461 | if (type->code () == TYPE_CODE_STRUCT && rust_enum_p (type)) | |
1462 | { | |
1463 | gdb::array_view<const gdb_byte> view (value_contents (lhs), | |
1464 | TYPE_LENGTH (type)); | |
1465 | type = resolve_dynamic_type (type, view, value_address (lhs)); | |
1466 | ||
1467 | if (rust_empty_enum_p (type)) | |
1468 | error (_("Cannot access field %s of empty enum %s"), | |
1469 | field_name, type->name ()); | |
1470 | ||
1471 | int fieldno = rust_enum_variant (type); | |
1472 | lhs = value_primitive_field (lhs, 0, fieldno, type); | |
1473 | ||
1474 | struct type *outer_type = type; | |
1475 | type = value_type (lhs); | |
1476 | if (rust_tuple_type_p (type) || rust_tuple_struct_type_p (type)) | |
1477 | error (_("Attempting to access named field %s of tuple " | |
1478 | "variant %s::%s, which has only anonymous fields"), | |
1479 | field_name, outer_type->name (), | |
1480 | rust_last_path_segment (type->name ())); | |
1481 | ||
1482 | try | |
1483 | { | |
1484 | result = value_struct_elt (&lhs, NULL, field_name, | |
1485 | NULL, "structure"); | |
1486 | } | |
1487 | catch (const gdb_exception_error &except) | |
1488 | { | |
1489 | error (_("Could not find field %s of struct variant %s::%s"), | |
1490 | field_name, outer_type->name (), | |
1491 | rust_last_path_segment (type->name ())); | |
1492 | } | |
1493 | } | |
1494 | else | |
1495 | result = value_struct_elt (&lhs, NULL, field_name, NULL, "structure"); | |
1496 | if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1497 | result = value_zero (value_type (result), VALUE_LVAL (result)); | |
1498 | return result; | |
1499 | } | |
1500 | ||
c44af4eb TT |
1501 | /* evaluate_exp implementation for Rust. */ |
1502 | ||
1503 | static struct value * | |
1504 | rust_evaluate_subexp (struct type *expect_type, struct expression *exp, | |
1505 | int *pos, enum noside noside) | |
1506 | { | |
1507 | struct value *result; | |
1508 | ||
1509 | switch (exp->elts[*pos].opcode) | |
1510 | { | |
71a3c369 TT |
1511 | case UNOP_IND: |
1512 | { | |
1513 | if (noside != EVAL_NORMAL) | |
1514 | result = evaluate_subexp_standard (expect_type, exp, pos, noside); | |
1515 | else | |
1516 | { | |
1517 | ++*pos; | |
1518 | struct value *value = evaluate_subexp (expect_type, exp, pos, | |
1519 | noside); | |
d123f9e4 | 1520 | result = eval_op_rust_ind (expect_type, exp, noside, value); |
71a3c369 TT |
1521 | } |
1522 | } | |
1523 | break; | |
1524 | ||
c44af4eb TT |
1525 | case UNOP_COMPLEMENT: |
1526 | { | |
1527 | struct value *value; | |
1528 | ||
1529 | ++*pos; | |
fe1fe7ea | 1530 | value = evaluate_subexp (nullptr, exp, pos, noside); |
6fa9831f | 1531 | result = eval_op_rust_complement (expect_type, exp, noside, value); |
c44af4eb TT |
1532 | } |
1533 | break; | |
1534 | ||
1535 | case BINOP_SUBSCRIPT: | |
984af2cb TT |
1536 | { |
1537 | ++*pos; | |
1538 | struct value *lhs = evaluate_subexp (nullptr, exp, pos, noside); | |
1539 | struct value *rhs = evaluate_subexp (nullptr, exp, pos, noside); | |
1540 | result = rust_subscript (expect_type, exp, noside, false, lhs, rhs); | |
1541 | } | |
c44af4eb TT |
1542 | break; |
1543 | ||
1544 | case OP_FUNCALL: | |
1545 | result = rust_evaluate_funcall (exp, pos, noside); | |
1546 | break; | |
1547 | ||
1548 | case OP_AGGREGATE: | |
1549 | { | |
1550 | int pc = (*pos)++; | |
1551 | struct type *type = exp->elts[pc + 1].type; | |
1552 | int arglen = longest_to_int (exp->elts[pc + 2].longconst); | |
1553 | int i; | |
1554 | CORE_ADDR addr = 0; | |
1555 | struct value *addrval = NULL; | |
1556 | ||
1557 | *pos += 3; | |
1558 | ||
1559 | if (noside == EVAL_NORMAL) | |
1560 | { | |
1561 | addrval = value_allocate_space_in_inferior (TYPE_LENGTH (type)); | |
1562 | addr = value_as_long (addrval); | |
1563 | result = value_at_lazy (type, addr); | |
1564 | } | |
1565 | ||
1566 | if (arglen > 0 && exp->elts[*pos].opcode == OP_OTHERS) | |
1567 | { | |
1568 | struct value *init; | |
1569 | ||
1570 | ++*pos; | |
1571 | init = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1572 | if (noside == EVAL_NORMAL) | |
1573 | { | |
1574 | /* This isn't quite right but will do for the time | |
1575 | being, seeing that we can't implement the Copy | |
1576 | trait anyway. */ | |
1577 | value_assign (result, init); | |
1578 | } | |
1579 | ||
1580 | --arglen; | |
1581 | } | |
1582 | ||
1583 | gdb_assert (arglen % 2 == 0); | |
1584 | for (i = 0; i < arglen; i += 2) | |
1585 | { | |
1586 | int len; | |
1587 | const char *fieldname; | |
1588 | struct value *value, *field; | |
1589 | ||
1590 | gdb_assert (exp->elts[*pos].opcode == OP_NAME); | |
1591 | ++*pos; | |
1592 | len = longest_to_int (exp->elts[*pos].longconst); | |
1593 | ++*pos; | |
1594 | fieldname = &exp->elts[*pos].string; | |
1595 | *pos += 2 + BYTES_TO_EXP_ELEM (len + 1); | |
1596 | ||
1597 | value = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1598 | if (noside == EVAL_NORMAL) | |
1599 | { | |
1600 | field = value_struct_elt (&result, NULL, fieldname, NULL, | |
1601 | "structure"); | |
1602 | value_assign (field, value); | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | if (noside == EVAL_SKIP) | |
1607 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, | |
1608 | 1); | |
1609 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
1610 | result = allocate_value (type); | |
1611 | else | |
1612 | result = value_at_lazy (type, addr); | |
1613 | } | |
1614 | break; | |
1615 | ||
1616 | case OP_RUST_ARRAY: | |
1617 | { | |
8d49165d | 1618 | (*pos)++; |
c44af4eb TT |
1619 | struct value *elt; |
1620 | struct value *ncopies; | |
1621 | ||
1622 | elt = rust_evaluate_subexp (NULL, exp, pos, noside); | |
1623 | ncopies = rust_evaluate_subexp (NULL, exp, pos, noside); | |
05104233 | 1624 | return eval_op_rust_array (expect_type, exp, noside, elt, ncopies); |
c44af4eb TT |
1625 | } |
1626 | break; | |
1627 | ||
1628 | case STRUCTOP_ANONYMOUS: | |
1629 | { | |
dda83cd7 SM |
1630 | /* Anonymous field access, i.e. foo.1. */ |
1631 | struct value *lhs; | |
575cae23 | 1632 | int pc, field_number; |
dda83cd7 SM |
1633 | |
1634 | pc = (*pos)++; | |
1635 | field_number = longest_to_int (exp->elts[pc + 1].longconst); | |
1636 | (*pos) += 2; | |
fe1fe7ea | 1637 | lhs = evaluate_subexp (nullptr, exp, pos, noside); |
c44af4eb | 1638 | |
575cae23 TT |
1639 | return eval_op_rust_struct_anon (expect_type, exp, noside, |
1640 | field_number, lhs); | |
c44af4eb TT |
1641 | } |
1642 | break; | |
1643 | ||
1644 | case STRUCTOP_STRUCT: | |
1645 | { | |
dda83cd7 | 1646 | struct value *lhs; |
dda83cd7 | 1647 | int tem, pc; |
c44af4eb | 1648 | |
dda83cd7 SM |
1649 | pc = (*pos)++; |
1650 | tem = longest_to_int (exp->elts[pc + 1].longconst); | |
1651 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); | |
fe1fe7ea | 1652 | lhs = evaluate_subexp (nullptr, exp, pos, noside); |
c44af4eb | 1653 | |
6830f270 | 1654 | const char *field_name = &exp->elts[pc + 2].string; |
1fa41fc7 TT |
1655 | return eval_op_rust_structop (expect_type, exp, noside, lhs, |
1656 | field_name); | |
c44af4eb TT |
1657 | } |
1658 | break; | |
1659 | ||
01739a3b | 1660 | case OP_RANGE: |
d148f803 TT |
1661 | { |
1662 | struct value *low = NULL, *high = NULL; | |
1663 | auto kind | |
1664 | = (enum range_flag) longest_to_int (exp->elts[*pos + 1].longconst); | |
1665 | *pos += 3; | |
1666 | ||
1667 | if (!(kind & RANGE_LOW_BOUND_DEFAULT)) | |
1668 | low = evaluate_subexp (nullptr, exp, pos, noside); | |
1669 | if (!(kind & RANGE_HIGH_BOUND_DEFAULT)) | |
1670 | high = evaluate_subexp (nullptr, exp, pos, noside); | |
1671 | ||
1672 | result = rust_range (expect_type, exp, noside, kind, low, high); | |
1673 | } | |
c44af4eb TT |
1674 | break; |
1675 | ||
1676 | case UNOP_ADDR: | |
1677 | /* We might have &array[range], in which case we need to make a | |
1678 | slice. */ | |
1679 | if (exp->elts[*pos + 1].opcode == BINOP_SUBSCRIPT) | |
1680 | { | |
1681 | ++*pos; | |
984af2cb TT |
1682 | ++*pos; |
1683 | struct value *lhs = evaluate_subexp (nullptr, exp, pos, noside); | |
1684 | struct value *rhs = evaluate_subexp (nullptr, exp, pos, noside); | |
1685 | ||
1686 | result = rust_subscript (expect_type, exp, noside, true, lhs, rhs); | |
c44af4eb TT |
1687 | break; |
1688 | } | |
1689 | /* Fall through. */ | |
1690 | default: | |
1691 | result = evaluate_subexp_standard (expect_type, exp, pos, noside); | |
1692 | break; | |
1693 | } | |
1694 | ||
1695 | return result; | |
1696 | } | |
1697 | ||
1698 | /* operator_length implementation for Rust. */ | |
1699 | ||
1700 | static void | |
1701 | rust_operator_length (const struct expression *exp, int pc, int *oplenp, | |
1702 | int *argsp) | |
1703 | { | |
1704 | int oplen = 1; | |
1705 | int args = 0; | |
1706 | ||
1707 | switch (exp->elts[pc - 1].opcode) | |
1708 | { | |
1709 | case OP_AGGREGATE: | |
1710 | /* We handle aggregate as a type and argument count. The first | |
1711 | argument might be OP_OTHERS. After that the arguments | |
1712 | alternate: first an OP_NAME, then an expression. */ | |
1713 | oplen = 4; | |
1714 | args = longest_to_int (exp->elts[pc - 2].longconst); | |
1715 | break; | |
1716 | ||
1717 | case OP_OTHERS: | |
1718 | oplen = 1; | |
1719 | args = 1; | |
1720 | break; | |
1721 | ||
1722 | case STRUCTOP_ANONYMOUS: | |
1723 | oplen = 3; | |
1724 | args = 1; | |
1725 | break; | |
1726 | ||
1727 | case OP_RUST_ARRAY: | |
1728 | oplen = 1; | |
1729 | args = 2; | |
1730 | break; | |
1731 | ||
1732 | default: | |
1733 | operator_length_standard (exp, pc, oplenp, argsp); | |
1734 | return; | |
1735 | } | |
1736 | ||
1737 | *oplenp = oplen; | |
1738 | *argsp = args; | |
1739 | } | |
1740 | ||
c44af4eb TT |
1741 | /* dump_subexp_body implementation for Rust. */ |
1742 | ||
1743 | static int | |
1744 | rust_dump_subexp_body (struct expression *exp, struct ui_file *stream, | |
1745 | int elt) | |
1746 | { | |
1747 | switch (exp->elts[elt].opcode) | |
1748 | { | |
1749 | case OP_AGGREGATE: | |
1750 | { | |
1751 | int length = longest_to_int (exp->elts[elt + 2].longconst); | |
1752 | int i; | |
1753 | ||
1754 | fprintf_filtered (stream, "Type @"); | |
1755 | gdb_print_host_address (exp->elts[elt + 1].type, stream); | |
1756 | fprintf_filtered (stream, " ("); | |
1757 | type_print (exp->elts[elt + 1].type, NULL, stream, 0); | |
1758 | fprintf_filtered (stream, "), length %d", length); | |
1759 | ||
1760 | elt += 4; | |
1761 | for (i = 0; i < length; ++i) | |
1762 | elt = dump_subexp (exp, stream, elt); | |
1763 | } | |
1764 | break; | |
1765 | ||
1766 | case OP_STRING: | |
1767 | case OP_NAME: | |
1768 | { | |
1769 | LONGEST len = exp->elts[elt + 1].longconst; | |
1770 | ||
1771 | fprintf_filtered (stream, "%s: %s", | |
1772 | (exp->elts[elt].opcode == OP_STRING | |
1773 | ? "string" : "name"), | |
1774 | &exp->elts[elt + 2].string); | |
1775 | elt += 4 + BYTES_TO_EXP_ELEM (len + 1); | |
1776 | } | |
1777 | break; | |
1778 | ||
1779 | case OP_OTHERS: | |
1780 | elt = dump_subexp (exp, stream, elt + 1); | |
1781 | break; | |
1782 | ||
1783 | case STRUCTOP_ANONYMOUS: | |
1784 | { | |
1785 | int field_number; | |
1786 | ||
68f2f2e3 | 1787 | field_number = longest_to_int (exp->elts[elt + 1].longconst); |
c44af4eb TT |
1788 | |
1789 | fprintf_filtered (stream, "Field number: %d", field_number); | |
68f2f2e3 | 1790 | elt = dump_subexp (exp, stream, elt + 3); |
c44af4eb TT |
1791 | } |
1792 | break; | |
1793 | ||
1794 | case OP_RUST_ARRAY: | |
68f2f2e3 | 1795 | ++elt; |
c44af4eb TT |
1796 | break; |
1797 | ||
1798 | default: | |
1799 | elt = dump_subexp_body_standard (exp, stream, elt); | |
1800 | break; | |
1801 | } | |
1802 | ||
1803 | return elt; | |
1804 | } | |
1805 | ||
1806 | /* print_subexp implementation for Rust. */ | |
1807 | ||
1808 | static void | |
1809 | rust_print_subexp (struct expression *exp, int *pos, struct ui_file *stream, | |
1810 | enum precedence prec) | |
1811 | { | |
1812 | switch (exp->elts[*pos].opcode) | |
1813 | { | |
1814 | case OP_AGGREGATE: | |
1815 | { | |
1816 | int length = longest_to_int (exp->elts[*pos + 2].longconst); | |
1817 | int i; | |
1818 | ||
1819 | type_print (exp->elts[*pos + 1].type, "", stream, 0); | |
1820 | fputs_filtered (" { ", stream); | |
1821 | ||
1822 | *pos += 4; | |
1823 | for (i = 0; i < length; ++i) | |
1824 | { | |
1825 | rust_print_subexp (exp, pos, stream, prec); | |
1826 | fputs_filtered (", ", stream); | |
1827 | } | |
1828 | fputs_filtered (" }", stream); | |
1829 | } | |
1830 | break; | |
1831 | ||
1832 | case OP_NAME: | |
1833 | { | |
1834 | LONGEST len = exp->elts[*pos + 1].longconst; | |
1835 | ||
1836 | fputs_filtered (&exp->elts[*pos + 2].string, stream); | |
1837 | *pos += 4 + BYTES_TO_EXP_ELEM (len + 1); | |
1838 | } | |
1839 | break; | |
1840 | ||
1841 | case OP_OTHERS: | |
1842 | { | |
1843 | fputs_filtered ("<<others>> (", stream); | |
1844 | ++*pos; | |
1845 | rust_print_subexp (exp, pos, stream, prec); | |
1846 | fputs_filtered (")", stream); | |
1847 | } | |
1848 | break; | |
1849 | ||
1850 | case STRUCTOP_ANONYMOUS: | |
1851 | { | |
1852 | int tem = longest_to_int (exp->elts[*pos + 1].longconst); | |
1853 | ||
1854 | (*pos) += 3; | |
1855 | print_subexp (exp, pos, stream, PREC_SUFFIX); | |
1856 | fprintf_filtered (stream, ".%d", tem); | |
1857 | } | |
256afbc2 | 1858 | break; |
c44af4eb TT |
1859 | |
1860 | case OP_RUST_ARRAY: | |
1861 | ++*pos; | |
1862 | fprintf_filtered (stream, "["); | |
1863 | rust_print_subexp (exp, pos, stream, prec); | |
1864 | fprintf_filtered (stream, "; "); | |
1865 | rust_print_subexp (exp, pos, stream, prec); | |
1866 | fprintf_filtered (stream, "]"); | |
1867 | break; | |
1868 | ||
1869 | default: | |
1870 | print_subexp_standard (exp, pos, stream, prec); | |
1871 | break; | |
1872 | } | |
1873 | } | |
1874 | ||
1875 | /* operator_check implementation for Rust. */ | |
1876 | ||
1877 | static int | |
1878 | rust_operator_check (struct expression *exp, int pos, | |
1879 | int (*objfile_func) (struct objfile *objfile, | |
1880 | void *data), | |
1881 | void *data) | |
1882 | { | |
1883 | switch (exp->elts[pos].opcode) | |
1884 | { | |
1885 | case OP_AGGREGATE: | |
1886 | { | |
1887 | struct type *type = exp->elts[pos + 1].type; | |
6ac37371 | 1888 | struct objfile *objfile = type->objfile_owner (); |
c44af4eb TT |
1889 | |
1890 | if (objfile != NULL && (*objfile_func) (objfile, data)) | |
1891 | return 1; | |
1892 | } | |
1893 | break; | |
1894 | ||
1895 | case OP_OTHERS: | |
1896 | case OP_NAME: | |
1897 | case OP_RUST_ARRAY: | |
1898 | break; | |
1899 | ||
1900 | default: | |
1901 | return operator_check_standard (exp, pos, objfile_func, data); | |
1902 | } | |
1903 | ||
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | \f | |
1908 | ||
1c485265 | 1909 | const struct exp_descriptor rust_language::exp_descriptor_tab = |
c44af4eb TT |
1910 | { |
1911 | rust_print_subexp, | |
1912 | rust_operator_length, | |
1913 | rust_operator_check, | |
c44af4eb TT |
1914 | rust_dump_subexp_body, |
1915 | rust_evaluate_subexp | |
1916 | }; | |
1917 | ||
1c485265 | 1918 | /* See language.h. */ |
0874fd07 | 1919 | |
1c485265 AB |
1920 | void |
1921 | rust_language::language_arch_info (struct gdbarch *gdbarch, | |
1922 | struct language_arch_info *lai) const | |
0874fd07 | 1923 | { |
1c485265 | 1924 | const struct builtin_type *builtin = builtin_type (gdbarch); |
87afa652 | 1925 | |
1c485265 AB |
1926 | /* Helper function to allow shorter lines below. */ |
1927 | auto add = [&] (struct type * t) -> struct type * | |
87afa652 | 1928 | { |
1c485265 AB |
1929 | lai->add_primitive_type (t); |
1930 | return t; | |
1931 | }; | |
1932 | ||
1933 | struct type *bool_type | |
1934 | = add (arch_boolean_type (gdbarch, 8, 1, "bool")); | |
1935 | add (arch_character_type (gdbarch, 32, 1, "char")); | |
1936 | add (arch_integer_type (gdbarch, 8, 0, "i8")); | |
1937 | struct type *u8_type | |
1938 | = add (arch_integer_type (gdbarch, 8, 1, "u8")); | |
1939 | add (arch_integer_type (gdbarch, 16, 0, "i16")); | |
1940 | add (arch_integer_type (gdbarch, 16, 1, "u16")); | |
1941 | add (arch_integer_type (gdbarch, 32, 0, "i32")); | |
1942 | add (arch_integer_type (gdbarch, 32, 1, "u32")); | |
1943 | add (arch_integer_type (gdbarch, 64, 0, "i64")); | |
1944 | add (arch_integer_type (gdbarch, 64, 1, "u64")); | |
1945 | ||
1946 | unsigned int length = 8 * TYPE_LENGTH (builtin->builtin_data_ptr); | |
1947 | add (arch_integer_type (gdbarch, length, 0, "isize")); | |
1948 | struct type *usize_type | |
1949 | = add (arch_integer_type (gdbarch, length, 1, "usize")); | |
1950 | ||
1951 | add (arch_float_type (gdbarch, 32, "f32", floatformats_ieee_single)); | |
1952 | add (arch_float_type (gdbarch, 64, "f64", floatformats_ieee_double)); | |
1953 | add (arch_integer_type (gdbarch, 0, 1, "()")); | |
1954 | ||
1955 | struct type *tem = make_cv_type (1, 0, u8_type, NULL); | |
1956 | add (rust_slice_type ("&str", tem, usize_type)); | |
1957 | ||
1958 | lai->set_bool_type (bool_type); | |
1959 | lai->set_string_char_type (u8_type); | |
1960 | } | |
39e7ecca | 1961 | |
1c485265 | 1962 | /* See language.h. */ |
efdf6a73 | 1963 | |
1c485265 AB |
1964 | void |
1965 | rust_language::print_type (struct type *type, const char *varstring, | |
1966 | struct ui_file *stream, int show, int level, | |
1967 | const struct type_print_options *flags) const | |
1968 | { | |
1969 | print_offset_data podata; | |
1970 | rust_internal_print_type (type, varstring, stream, show, level, | |
1971 | flags, false, &podata); | |
1972 | } | |
efdf6a73 | 1973 | |
1c485265 | 1974 | /* See language.h. */ |
5aba6ebe | 1975 | |
1c485265 AB |
1976 | void |
1977 | rust_language::emitchar (int ch, struct type *chtype, | |
1978 | struct ui_file *stream, int quoter) const | |
1979 | { | |
1980 | if (!rust_chartype_p (chtype)) | |
1981 | generic_emit_char (ch, chtype, stream, quoter, | |
8ee511af | 1982 | target_charset (chtype->arch ())); |
1c485265 AB |
1983 | else if (ch == '\\' || ch == quoter) |
1984 | fprintf_filtered (stream, "\\%c", ch); | |
1985 | else if (ch == '\n') | |
1986 | fputs_filtered ("\\n", stream); | |
1987 | else if (ch == '\r') | |
1988 | fputs_filtered ("\\r", stream); | |
1989 | else if (ch == '\t') | |
1990 | fputs_filtered ("\\t", stream); | |
1991 | else if (ch == '\0') | |
1992 | fputs_filtered ("\\0", stream); | |
1993 | else if (ch >= 32 && ch <= 127 && isprint (ch)) | |
1994 | fputc_filtered (ch, stream); | |
1995 | else if (ch <= 255) | |
1996 | fprintf_filtered (stream, "\\x%02x", ch); | |
1997 | else | |
1998 | fprintf_filtered (stream, "\\u{%06x}", ch); | |
1999 | } | |
5aba6ebe | 2000 | |
1c485265 | 2001 | /* See language.h. */ |
b7c6e27d | 2002 | |
1c485265 AB |
2003 | bool |
2004 | rust_language::is_string_type_p (struct type *type) const | |
2005 | { | |
2006 | LONGEST low_bound, high_bound; | |
b7c6e27d | 2007 | |
1c485265 AB |
2008 | type = check_typedef (type); |
2009 | return ((type->code () == TYPE_CODE_STRING) | |
2010 | || (type->code () == TYPE_CODE_PTR | |
2011 | && (TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_ARRAY | |
2012 | && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type))) | |
2013 | && get_array_bounds (TYPE_TARGET_TYPE (type), &low_bound, | |
2014 | &high_bound))) | |
2015 | || (type->code () == TYPE_CODE_STRUCT | |
2016 | && !rust_enum_p (type) | |
2017 | && rust_slice_type_p (type) | |
2018 | && strcmp (type->name (), "&str") == 0)); | |
2019 | } | |
0874fd07 AB |
2020 | |
2021 | /* Single instance of the Rust language class. */ | |
2022 | ||
2023 | static rust_language rust_language_defn; |