1 /* Rust language support routines for GDB, the GNU debugger.
3 Copyright (C) 2016-2020 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
27 #include "cp-support.h"
33 #include "rust-lang.h"
34 #include "typeprint.h"
40 #include "cli/cli-style.h"
42 /* See rust-lang.h. */
45 rust_last_path_segment (const char *path
)
47 const char *result
= strrchr (path
, ':');
54 /* See rust-lang.h. */
57 rust_crate_for_block (const struct block
*block
)
59 const char *scope
= block_scope (block
);
62 return std::string ();
64 return std::string (scope
, cp_find_first_component (scope
));
67 /* Return true if TYPE, which must be a struct type, represents a Rust
71 rust_enum_p (struct type
*type
)
73 /* is_dynamic_type will return true if any field has a dynamic
74 attribute -- but we only want to check the top level. */
75 return TYPE_HAS_VARIANT_PARTS (type
);
78 /* Return true if TYPE, which must be an already-resolved enum type,
82 rust_empty_enum_p (const struct type
*type
)
84 return type
->num_fields () == 0;
87 /* Given an already-resolved enum type and contents, find which
91 rust_enum_variant (struct type
*type
)
93 /* The active variant is simply the first non-artificial field. */
94 for (int i
= 0; i
< type
->num_fields (); ++i
)
95 if (!TYPE_FIELD_ARTIFICIAL (type
, i
))
98 /* Perhaps we could get here by trying to print an Ada variant
99 record in Rust mode. Unlikely, but an error is safer than an
101 error (_("Could not find active enum variant"));
104 /* See rust-lang.h. */
107 rust_tuple_type_p (struct type
*type
)
109 /* The current implementation is a bit of a hack, but there's
110 nothing else in the debuginfo to distinguish a tuple from a
112 return (type
->code () == TYPE_CODE_STRUCT
113 && type
->name () != NULL
114 && type
->name ()[0] == '(');
117 /* Return true if all non-static fields of a structlike type are in a
118 sequence like __0, __1, __2. */
121 rust_underscore_fields (struct type
*type
)
127 if (type
->code () != TYPE_CODE_STRUCT
)
129 for (i
= 0; i
< type
->num_fields (); ++i
)
131 if (!field_is_static (&type
->field (i
)))
135 xsnprintf (buf
, sizeof (buf
), "__%d", field_number
);
136 if (strcmp (buf
, TYPE_FIELD_NAME (type
, i
)) != 0)
144 /* See rust-lang.h. */
147 rust_tuple_struct_type_p (struct type
*type
)
149 /* This is just an approximation until DWARF can represent Rust more
150 precisely. We exclude zero-length structs because they may not
151 be tuple structs, and there's no way to tell. */
152 return type
->num_fields () > 0 && rust_underscore_fields (type
);
155 /* Return true if TYPE is a slice type, otherwise false. */
158 rust_slice_type_p (struct type
*type
)
160 return (type
->code () == TYPE_CODE_STRUCT
161 && type
->name () != NULL
162 && (strncmp (type
->name (), "&[", 2) == 0
163 || strcmp (type
->name (), "&str") == 0));
166 /* Return true if TYPE is a range type, otherwise false. */
169 rust_range_type_p (struct type
*type
)
173 if (type
->code () != TYPE_CODE_STRUCT
174 || type
->num_fields () > 2
175 || type
->name () == NULL
176 || strstr (type
->name (), "::Range") == NULL
)
179 if (type
->num_fields () == 0)
183 if (strcmp (TYPE_FIELD_NAME (type
, 0), "start") == 0)
185 if (type
->num_fields () == 1)
189 else if (type
->num_fields () == 2)
191 /* First field had to be "start". */
195 return strcmp (TYPE_FIELD_NAME (type
, i
), "end") == 0;
198 /* Return true if TYPE is an inclusive range type, otherwise false.
199 This is only valid for types which are already known to be range
203 rust_inclusive_range_type_p (struct type
*type
)
205 return (strstr (type
->name (), "::RangeInclusive") != NULL
206 || strstr (type
->name (), "::RangeToInclusive") != NULL
);
209 /* Return true if TYPE seems to be the type "u8", otherwise false. */
212 rust_u8_type_p (struct type
*type
)
214 return (type
->code () == TYPE_CODE_INT
215 && TYPE_UNSIGNED (type
)
216 && TYPE_LENGTH (type
) == 1);
219 /* Return true if TYPE is a Rust character type. */
222 rust_chartype_p (struct type
*type
)
224 return (type
->code () == TYPE_CODE_CHAR
225 && TYPE_LENGTH (type
) == 4
226 && TYPE_UNSIGNED (type
));
229 /* Return true if TYPE is a string type. */
232 rust_is_string_type_p (struct type
*type
)
234 LONGEST low_bound
, high_bound
;
236 type
= check_typedef (type
);
237 return ((type
->code () == TYPE_CODE_STRING
)
238 || (type
->code () == TYPE_CODE_PTR
239 && (TYPE_TARGET_TYPE (type
)->code () == TYPE_CODE_ARRAY
240 && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type
)))
241 && get_array_bounds (TYPE_TARGET_TYPE (type
), &low_bound
,
243 || (type
->code () == TYPE_CODE_STRUCT
244 && !rust_enum_p (type
)
245 && rust_slice_type_p (type
)
246 && strcmp (type
->name (), "&str") == 0));
249 /* If VALUE represents a trait object pointer, return the underlying
250 pointer with the correct (i.e., runtime) type. Otherwise, return
253 static struct value
*
254 rust_get_trait_object_pointer (struct value
*value
)
256 struct type
*type
= check_typedef (value_type (value
));
258 if (type
->code () != TYPE_CODE_STRUCT
|| type
->num_fields () != 2)
261 /* Try to be a bit resilient if the ABI changes. */
262 int vtable_field
= 0;
263 for (int i
= 0; i
< 2; ++i
)
265 if (strcmp (TYPE_FIELD_NAME (type
, i
), "vtable") == 0)
267 else if (strcmp (TYPE_FIELD_NAME (type
, i
), "pointer") != 0)
271 CORE_ADDR vtable
= value_as_address (value_field (value
, vtable_field
));
272 struct symbol
*symbol
= find_symbol_at_address (vtable
);
273 if (symbol
== NULL
|| symbol
->subclass
!= SYMBOL_RUST_VTABLE
)
276 struct rust_vtable_symbol
*vtable_sym
277 = static_cast<struct rust_vtable_symbol
*> (symbol
);
278 struct type
*pointer_type
= lookup_pointer_type (vtable_sym
->concrete_type
);
279 return value_cast (pointer_type
, value_field (value
, 1 - vtable_field
));
284 /* la_emitchar implementation for Rust. */
287 rust_emitchar (int c
, struct type
*type
, struct ui_file
*stream
, int quoter
)
289 if (!rust_chartype_p (type
))
290 generic_emit_char (c
, type
, stream
, quoter
,
291 target_charset (get_type_arch (type
)));
292 else if (c
== '\\' || c
== quoter
)
293 fprintf_filtered (stream
, "\\%c", c
);
295 fputs_filtered ("\\n", stream
);
297 fputs_filtered ("\\r", stream
);
299 fputs_filtered ("\\t", stream
);
301 fputs_filtered ("\\0", stream
);
302 else if (c
>= 32 && c
<= 127 && isprint (c
))
303 fputc_filtered (c
, stream
);
305 fprintf_filtered (stream
, "\\x%02x", c
);
307 fprintf_filtered (stream
, "\\u{%06x}", c
);
310 /* la_printchar implementation for Rust. */
313 rust_printchar (int c
, struct type
*type
, struct ui_file
*stream
)
315 fputs_filtered ("'", stream
);
316 LA_EMIT_CHAR (c
, type
, stream
, '\'');
317 fputs_filtered ("'", stream
);
320 /* la_printstr implementation for Rust. */
323 rust_printstr (struct ui_file
*stream
, struct type
*type
,
324 const gdb_byte
*string
, unsigned int length
,
325 const char *user_encoding
, int force_ellipses
,
326 const struct value_print_options
*options
)
328 /* Rust always uses UTF-8, but let the caller override this if need
330 const char *encoding
= user_encoding
;
331 if (user_encoding
== NULL
|| !*user_encoding
)
333 /* In Rust strings, characters are "u8". */
334 if (rust_u8_type_p (type
))
338 /* This is probably some C string, so let's let C deal with
340 c_printstr (stream
, type
, string
, length
, user_encoding
,
341 force_ellipses
, options
);
346 /* This is not ideal as it doesn't use our character printer. */
347 generic_printstr (stream
, type
, string
, length
, encoding
, force_ellipses
,
353 static void rust_value_print_inner (struct value
*val
, struct ui_file
*stream
,
355 const struct value_print_options
*options
);
357 /* Helper function to print a string slice. */
360 rust_val_print_str (struct ui_file
*stream
, struct value
*val
,
361 const struct value_print_options
*options
)
363 struct value
*base
= value_struct_elt (&val
, NULL
, "data_ptr", NULL
,
365 struct value
*len
= value_struct_elt (&val
, NULL
, "length", NULL
, "slice");
367 val_print_string (TYPE_TARGET_TYPE (value_type (base
)), "UTF-8",
368 value_as_address (base
), value_as_long (len
), stream
,
372 /* rust_val_print helper for structs and untagged unions. */
375 val_print_struct (struct value
*val
, struct ui_file
*stream
, int recurse
,
376 const struct value_print_options
*options
)
380 struct type
*type
= check_typedef (value_type (val
));
382 if (rust_slice_type_p (type
) && strcmp (type
->name (), "&str") == 0)
384 /* If what we are printing here is actually a string within a
385 structure then VAL will be the original parent value, while TYPE
386 will be the type of the structure representing the string we want
388 However, RUST_VAL_PRINT_STR looks up the fields of the string
389 inside VAL, assuming that VAL is the string.
390 So, recreate VAL as a value representing just the string. */
391 val
= value_at_lazy (type
, value_address (val
));
392 rust_val_print_str (stream
, val
, options
);
396 bool is_tuple
= rust_tuple_type_p (type
);
397 bool is_tuple_struct
= !is_tuple
&& rust_tuple_struct_type_p (type
);
398 struct value_print_options opts
;
402 if (type
->name () != NULL
)
403 fprintf_filtered (stream
, "%s", type
->name ());
405 if (type
->num_fields () == 0)
408 if (type
->name () != NULL
)
409 fputs_filtered (" ", stream
);
412 if (is_tuple
|| is_tuple_struct
)
413 fputs_filtered ("(", stream
);
415 fputs_filtered ("{", stream
);
421 for (i
= 0; i
< type
->num_fields (); ++i
)
423 if (field_is_static (&type
->field (i
)))
427 fputs_filtered (",", stream
);
429 if (options
->prettyformat
)
431 fputs_filtered ("\n", stream
);
432 print_spaces_filtered (2 + 2 * recurse
, stream
);
434 else if (!first_field
)
435 fputs_filtered (" ", stream
);
439 if (!is_tuple
&& !is_tuple_struct
)
441 fputs_styled (TYPE_FIELD_NAME (type
, i
),
442 variable_name_style
.style (), stream
);
443 fputs_filtered (": ", stream
);
446 rust_value_print_inner (value_field (val
, i
), stream
, recurse
+ 1,
450 if (options
->prettyformat
)
452 fputs_filtered ("\n", stream
);
453 print_spaces_filtered (2 * recurse
, stream
);
456 if (is_tuple
|| is_tuple_struct
)
457 fputs_filtered (")", stream
);
459 fputs_filtered ("}", stream
);
462 /* rust_val_print helper for discriminated unions (Rust enums). */
465 rust_print_enum (struct value
*val
, struct ui_file
*stream
, int recurse
,
466 const struct value_print_options
*options
)
468 struct value_print_options opts
= *options
;
469 struct type
*type
= check_typedef (value_type (val
));
473 gdb_assert (rust_enum_p (type
));
474 gdb::array_view
<const gdb_byte
> view (value_contents_for_printing (val
),
475 TYPE_LENGTH (value_type (val
)));
476 type
= resolve_dynamic_type (type
, view
, value_address (val
));
478 if (rust_empty_enum_p (type
))
480 /* Print the enum type name here to be more clear. */
481 fprintf_filtered (stream
, _("%s {%p[<No data fields>%p]}"),
483 metadata_style
.style ().ptr (), nullptr);
487 int variant_fieldno
= rust_enum_variant (type
);
488 val
= value_field (val
, variant_fieldno
);
489 struct type
*variant_type
= TYPE_FIELD_TYPE (type
, variant_fieldno
);
491 int nfields
= variant_type
->num_fields ();
493 bool is_tuple
= rust_tuple_struct_type_p (variant_type
);
495 fprintf_filtered (stream
, "%s", variant_type
->name ());
498 /* In case of a nullary variant like 'None', just output
503 /* In case of a non-nullary variant, we output 'Foo(x,y,z)'. */
505 fprintf_filtered (stream
, "(");
508 /* struct variant. */
509 fprintf_filtered (stream
, "{");
512 bool first_field
= true;
513 for (int j
= 0; j
< variant_type
->num_fields (); j
++)
516 fputs_filtered (", ", stream
);
520 fprintf_filtered (stream
, "%ps: ",
521 styled_string (variable_name_style
.style (),
522 TYPE_FIELD_NAME (variant_type
, j
)));
524 rust_value_print_inner (value_field (val
, j
), stream
, recurse
+ 1,
529 fputs_filtered (")", stream
);
531 fputs_filtered ("}", stream
);
534 static const struct generic_val_print_decorations rust_decorations
=
536 /* Complex isn't used in Rust, but we provide C-ish values just in
548 /* la_value_print_inner implementation for Rust. */
550 rust_value_print_inner (struct value
*val
, struct ui_file
*stream
,
552 const struct value_print_options
*options
)
554 struct value_print_options opts
= *options
;
557 if (opts
.prettyformat
== Val_prettyformat_default
)
558 opts
.prettyformat
= (opts
.prettyformat_structs
559 ? Val_prettyformat
: Val_no_prettyformat
);
561 struct type
*type
= check_typedef (value_type (val
));
562 switch (type
->code ())
566 LONGEST low_bound
, high_bound
;
568 if (TYPE_TARGET_TYPE (type
)->code () == TYPE_CODE_ARRAY
569 && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type
)))
570 && get_array_bounds (TYPE_TARGET_TYPE (type
), &low_bound
,
573 /* We have a pointer to a byte string, so just print
575 struct type
*elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
576 CORE_ADDR addr
= value_as_address (val
);
577 struct gdbarch
*arch
= get_type_arch (type
);
579 if (opts
.addressprint
)
581 fputs_filtered (paddress (arch
, addr
), stream
);
582 fputs_filtered (" ", stream
);
585 fputs_filtered ("b", stream
);
586 val_print_string (TYPE_TARGET_TYPE (elttype
), "ASCII", addr
,
587 high_bound
- low_bound
+ 1, stream
,
594 case TYPE_CODE_METHODPTR
:
595 case TYPE_CODE_MEMBERPTR
:
596 c_value_print_inner (val
, stream
, recurse
, &opts
);
600 /* Recognize the unit type. */
601 if (TYPE_UNSIGNED (type
) && TYPE_LENGTH (type
) == 0
602 && type
->name () != NULL
&& strcmp (type
->name (), "()") == 0)
604 fputs_filtered ("()", stream
);
609 case TYPE_CODE_STRING
:
611 LONGEST low_bound
, high_bound
;
613 if (!get_array_bounds (type
, &low_bound
, &high_bound
))
614 error (_("Could not determine the array bounds"));
616 /* If we see a plain TYPE_CODE_STRING, then we're printing a
617 byte string, hence the choice of "ASCII" as the
619 fputs_filtered ("b", stream
);
620 rust_printstr (stream
, TYPE_TARGET_TYPE (type
),
621 value_contents_for_printing (val
),
622 high_bound
- low_bound
+ 1, "ASCII", 0, &opts
);
626 case TYPE_CODE_ARRAY
:
628 LONGEST low_bound
, high_bound
;
630 if (get_array_bounds (type
, &low_bound
, &high_bound
)
631 && high_bound
- low_bound
+ 1 == 0)
632 fputs_filtered ("[]", stream
);
638 case TYPE_CODE_UNION
:
639 /* Untagged unions are printed as if they are structs. Since
640 the field bit positions overlap in the debuginfo, the code
641 for printing a union is same as that for a struct, the only
642 difference is that the input type will have overlapping
644 val_print_struct (val
, stream
, recurse
, &opts
);
647 case TYPE_CODE_STRUCT
:
648 if (rust_enum_p (type
))
649 rust_print_enum (val
, stream
, recurse
, &opts
);
651 val_print_struct (val
, stream
, recurse
, &opts
);
656 /* Nothing special yet. */
657 generic_value_print (val
, stream
, recurse
, &opts
, &rust_decorations
);
664 rust_internal_print_type (struct type
*type
, const char *varstring
,
665 struct ui_file
*stream
, int show
, int level
,
666 const struct type_print_options
*flags
,
667 bool for_rust_enum
, print_offset_data
*podata
);
669 /* Print a struct or union typedef. */
671 rust_print_struct_def (struct type
*type
, const char *varstring
,
672 struct ui_file
*stream
, int show
, int level
,
673 const struct type_print_options
*flags
,
674 bool for_rust_enum
, print_offset_data
*podata
)
676 /* Print a tuple type simply. */
677 if (rust_tuple_type_p (type
))
679 fputs_filtered (type
->name (), stream
);
683 /* If we see a base class, delegate to C. */
684 if (TYPE_N_BASECLASSES (type
) > 0)
685 c_print_type (type
, varstring
, stream
, show
, level
, flags
);
687 if (flags
->print_offsets
)
689 /* Temporarily bump the level so that the output lines up
694 /* Compute properties of TYPE here because, in the enum case, the
695 rest of the code ends up looking only at the variant part. */
696 const char *tagname
= type
->name ();
697 bool is_tuple_struct
= rust_tuple_struct_type_p (type
);
698 bool is_tuple
= rust_tuple_type_p (type
);
699 bool is_enum
= rust_enum_p (type
);
703 /* Already printing an outer enum, so nothing to print here. */
707 /* This code path is also used by unions and enums. */
710 fputs_filtered ("enum ", stream
);
711 dynamic_prop
*prop
= type
->dyn_prop (DYN_PROP_VARIANT_PARTS
);
712 if (prop
!= nullptr && prop
->kind
== PROP_TYPE
)
713 type
= prop
->data
.original_type
;
715 else if (type
->code () == TYPE_CODE_STRUCT
)
716 fputs_filtered ("struct ", stream
);
718 fputs_filtered ("union ", stream
);
721 fputs_filtered (tagname
, stream
);
724 if (type
->num_fields () == 0 && !is_tuple
)
726 if (for_rust_enum
&& !flags
->print_offsets
)
727 fputs_filtered (is_tuple_struct
? "(" : "{", stream
);
729 fputs_filtered (is_tuple_struct
? " (\n" : " {\n", stream
);
731 /* When printing offsets, we rearrange the fields into storage
732 order. This lets us show holes more clearly. We work using
733 field indices here because it simplifies calls to
734 print_offset_data::update below. */
735 std::vector
<int> fields
;
736 for (int i
= 0; i
< type
->num_fields (); ++i
)
738 if (field_is_static (&type
->field (i
)))
740 if (is_enum
&& TYPE_FIELD_ARTIFICIAL (type
, i
))
742 fields
.push_back (i
);
744 if (flags
->print_offsets
)
745 std::sort (fields
.begin (), fields
.end (),
748 return (TYPE_FIELD_BITPOS (type
, a
)
749 < TYPE_FIELD_BITPOS (type
, b
));
756 gdb_assert (!field_is_static (&type
->field (i
)));
757 gdb_assert (! (is_enum
&& TYPE_FIELD_ARTIFICIAL (type
, i
)));
759 if (flags
->print_offsets
)
760 podata
->update (type
, i
, stream
);
762 /* We'd like to print "pub" here as needed, but rustc
763 doesn't emit the debuginfo, and our types don't have
764 cplus_struct_type attached. */
766 /* For a tuple struct we print the type but nothing
768 if (!for_rust_enum
|| flags
->print_offsets
)
769 print_spaces_filtered (level
+ 2, stream
);
771 fputs_styled (TYPE_FIELD_NAME (type
, i
), variable_name_style
.style (),
773 else if (!is_tuple_struct
)
774 fprintf_filtered (stream
, "%ps: ",
775 styled_string (variable_name_style
.style (),
776 TYPE_FIELD_NAME (type
, i
)));
778 rust_internal_print_type (TYPE_FIELD_TYPE (type
, i
), NULL
,
779 stream
, (is_enum
? show
: show
- 1),
780 level
+ 2, flags
, is_enum
, podata
);
781 if (!for_rust_enum
|| flags
->print_offsets
)
782 fputs_filtered (",\n", stream
);
783 /* Note that this check of "I" is ok because we only sorted the
784 fields by offset when print_offsets was set, so we won't take
785 this branch in that case. */
786 else if (i
+ 1 < type
->num_fields ())
787 fputs_filtered (", ", stream
);
790 if (flags
->print_offsets
)
792 /* Undo the temporary level increase we did above. */
794 podata
->finish (type
, level
, stream
);
795 print_spaces_filtered (print_offset_data::indentation
, stream
);
797 print_spaces_filtered (2, stream
);
799 if (!for_rust_enum
|| flags
->print_offsets
)
800 print_spaces_filtered (level
, stream
);
801 fputs_filtered (is_tuple_struct
? ")" : "}", stream
);
804 /* la_print_typedef implementation for Rust. */
807 rust_print_typedef (struct type
*type
,
808 struct symbol
*new_symbol
,
809 struct ui_file
*stream
)
811 type
= check_typedef (type
);
812 fprintf_filtered (stream
, "type %s = ", new_symbol
->print_name ());
813 type_print (type
, "", stream
, 0);
814 fprintf_filtered (stream
, ";");
817 /* la_print_type implementation for Rust. */
820 rust_internal_print_type (struct type
*type
, const char *varstring
,
821 struct ui_file
*stream
, int show
, int level
,
822 const struct type_print_options
*flags
,
823 bool for_rust_enum
, print_offset_data
*podata
)
827 && type
->name () != NULL
)
829 /* Rust calls the unit type "void" in its debuginfo,
830 but we don't want to print it as that. */
831 if (type
->code () == TYPE_CODE_VOID
)
832 fputs_filtered ("()", stream
);
834 fputs_filtered (type
->name (), stream
);
838 type
= check_typedef (type
);
839 switch (type
->code ())
842 /* If we have an enum, we've already printed the type's
843 unqualified name, and there is nothing else to print
846 fputs_filtered ("()", stream
);
850 /* Delegate varargs to the C printer. */
851 if (TYPE_VARARGS (type
))
854 fputs_filtered ("fn ", stream
);
855 if (varstring
!= NULL
)
856 fputs_filtered (varstring
, stream
);
857 fputs_filtered ("(", stream
);
858 for (int i
= 0; i
< type
->num_fields (); ++i
)
862 fputs_filtered (", ", stream
);
863 rust_internal_print_type (TYPE_FIELD_TYPE (type
, i
), "", stream
,
864 -1, 0, flags
, false, podata
);
866 fputs_filtered (")", stream
);
867 /* If it returns unit, we can omit the return type. */
868 if (TYPE_TARGET_TYPE (type
)->code () != TYPE_CODE_VOID
)
870 fputs_filtered (" -> ", stream
);
871 rust_internal_print_type (TYPE_TARGET_TYPE (type
), "", stream
,
872 -1, 0, flags
, false, podata
);
876 case TYPE_CODE_ARRAY
:
878 LONGEST low_bound
, high_bound
;
880 fputs_filtered ("[", stream
);
881 rust_internal_print_type (TYPE_TARGET_TYPE (type
), NULL
,
882 stream
, show
- 1, level
, flags
, false,
885 if (TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type
)) == PROP_LOCEXPR
886 || TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type
)) == PROP_LOCLIST
)
887 fprintf_filtered (stream
, "; variable length");
888 else if (get_array_bounds (type
, &low_bound
, &high_bound
))
889 fprintf_filtered (stream
, "; %s",
890 plongest (high_bound
- low_bound
+ 1));
891 fputs_filtered ("]", stream
);
895 case TYPE_CODE_UNION
:
896 case TYPE_CODE_STRUCT
:
897 rust_print_struct_def (type
, varstring
, stream
, show
, level
, flags
,
898 for_rust_enum
, podata
);
905 fputs_filtered ("enum ", stream
);
906 if (type
->name () != NULL
)
908 fputs_filtered (type
->name (), stream
);
909 fputs_filtered (" ", stream
);
910 len
= strlen (type
->name ());
912 fputs_filtered ("{\n", stream
);
914 for (int i
= 0; i
< type
->num_fields (); ++i
)
916 const char *name
= TYPE_FIELD_NAME (type
, i
);
921 && strncmp (name
, type
->name (), len
) == 0
923 && name
[len
+ 1] == ':')
925 fprintfi_filtered (level
+ 2, stream
, "%ps,\n",
926 styled_string (variable_name_style
.style (),
930 fputs_filtered ("}", stream
);
936 if (type
->name () != nullptr)
937 fputs_filtered (type
->name (), stream
);
940 /* We currently can't distinguish between pointers and
942 fputs_filtered ("*mut ", stream
);
943 type_print (TYPE_TARGET_TYPE (type
), "", stream
, 0);
950 c_print_type (type
, varstring
, stream
, show
, level
, flags
);
955 rust_print_type (struct type
*type
, const char *varstring
,
956 struct ui_file
*stream
, int show
, int level
,
957 const struct type_print_options
*flags
)
959 print_offset_data podata
;
960 rust_internal_print_type (type
, varstring
, stream
, show
, level
,
961 flags
, false, &podata
);
966 /* Like arch_composite_type, but uses TYPE to decide how to allocate
967 -- either on an obstack or on a gdbarch. */
970 rust_composite_type (struct type
*original
,
972 const char *field1
, struct type
*type1
,
973 const char *field2
, struct type
*type2
)
975 struct type
*result
= alloc_type_copy (original
);
976 int i
, nfields
, bitpos
;
984 result
->set_code (TYPE_CODE_STRUCT
);
985 result
->set_name (name
);
987 result
->set_num_fields (nfields
);
989 ((struct field
*) TYPE_ZALLOC (result
, nfields
* sizeof (struct field
)));
995 struct field
*field
= &result
->field (i
);
997 SET_FIELD_BITPOS (*field
, bitpos
);
998 bitpos
+= TYPE_LENGTH (type1
) * TARGET_CHAR_BIT
;
1000 FIELD_NAME (*field
) = field1
;
1001 FIELD_TYPE (*field
) = type1
;
1006 struct field
*field
= &result
->field (i
);
1007 unsigned align
= type_align (type2
);
1013 align
*= TARGET_CHAR_BIT
;
1014 delta
= bitpos
% align
;
1016 bitpos
+= align
- delta
;
1018 SET_FIELD_BITPOS (*field
, bitpos
);
1020 FIELD_NAME (*field
) = field2
;
1021 FIELD_TYPE (*field
) = type2
;
1026 TYPE_LENGTH (result
)
1027 = (TYPE_FIELD_BITPOS (result
, i
- 1) / TARGET_CHAR_BIT
+
1028 TYPE_LENGTH (TYPE_FIELD_TYPE (result
, i
- 1)));
1032 /* See rust-lang.h. */
1035 rust_slice_type (const char *name
, struct type
*elt_type
,
1036 struct type
*usize_type
)
1040 elt_type
= lookup_pointer_type (elt_type
);
1041 type
= rust_composite_type (elt_type
, name
,
1042 "data_ptr", elt_type
,
1043 "length", usize_type
);
1048 enum rust_primitive_types
1050 rust_primitive_bool
,
1051 rust_primitive_char
,
1060 rust_primitive_isize
,
1061 rust_primitive_usize
,
1064 rust_primitive_unit
,
1066 nr_rust_primitive_types
1071 /* A helper for rust_evaluate_subexp that handles OP_FUNCALL. */
1073 static struct value
*
1074 rust_evaluate_funcall (struct expression
*exp
, int *pos
, enum noside noside
)
1077 int num_args
= exp
->elts
[*pos
+ 1].longconst
;
1079 struct value
*function
, *result
, *arg0
;
1080 struct type
*type
, *fn_type
;
1081 const struct block
*block
;
1082 struct block_symbol sym
;
1084 /* For an ordinary function call we can simply defer to the
1085 generic implementation. */
1086 if (exp
->elts
[*pos
+ 3].opcode
!= STRUCTOP_STRUCT
)
1087 return evaluate_subexp_standard (NULL
, exp
, pos
, noside
);
1089 /* Skip over the OP_FUNCALL and the STRUCTOP_STRUCT. */
1091 method
= &exp
->elts
[*pos
+ 1].string
;
1092 *pos
+= 3 + BYTES_TO_EXP_ELEM (exp
->elts
[*pos
].longconst
+ 1);
1094 /* Evaluate the argument to STRUCTOP_STRUCT, then find its
1095 type in order to look up the method. */
1096 arg0
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1098 if (noside
== EVAL_SKIP
)
1100 for (i
= 0; i
< num_args
; ++i
)
1101 evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1105 std::vector
<struct value
*> args (num_args
+ 1);
1108 /* We don't yet implement real Deref semantics. */
1109 while (value_type (args
[0])->code () == TYPE_CODE_PTR
)
1110 args
[0] = value_ind (args
[0]);
1112 type
= value_type (args
[0]);
1113 if ((type
->code () != TYPE_CODE_STRUCT
1114 && type
->code () != TYPE_CODE_UNION
1115 && type
->code () != TYPE_CODE_ENUM
)
1116 || rust_tuple_type_p (type
))
1117 error (_("Method calls only supported on struct or enum types"));
1118 if (type
->name () == NULL
)
1119 error (_("Method call on nameless type"));
1121 std::string name
= std::string (type
->name ()) + "::" + method
;
1123 block
= get_selected_block (0);
1124 sym
= lookup_symbol (name
.c_str (), block
, VAR_DOMAIN
, NULL
);
1125 if (sym
.symbol
== NULL
)
1126 error (_("Could not find function named '%s'"), name
.c_str ());
1128 fn_type
= SYMBOL_TYPE (sym
.symbol
);
1129 if (fn_type
->num_fields () == 0)
1130 error (_("Function '%s' takes no arguments"), name
.c_str ());
1132 if (TYPE_FIELD_TYPE (fn_type
, 0)->code () == TYPE_CODE_PTR
)
1133 args
[0] = value_addr (args
[0]);
1135 function
= address_of_variable (sym
.symbol
, block
);
1137 for (i
= 0; i
< num_args
; ++i
)
1138 args
[i
+ 1] = evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1140 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1141 result
= value_zero (TYPE_TARGET_TYPE (fn_type
), not_lval
);
1143 result
= call_function_by_hand (function
, NULL
, args
);
1147 /* A helper for rust_evaluate_subexp that handles OP_RANGE. */
1149 static struct value
*
1150 rust_range (struct expression
*exp
, int *pos
, enum noside noside
)
1152 enum range_type kind
;
1153 struct value
*low
= NULL
, *high
= NULL
;
1154 struct value
*addrval
, *result
;
1156 struct type
*range_type
;
1157 struct type
*index_type
;
1158 struct type
*temp_type
;
1161 kind
= (enum range_type
) longest_to_int (exp
->elts
[*pos
+ 1].longconst
);
1164 if (kind
== HIGH_BOUND_DEFAULT
|| kind
== NONE_BOUND_DEFAULT
1165 || kind
== NONE_BOUND_DEFAULT_EXCLUSIVE
)
1166 low
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1167 if (kind
== LOW_BOUND_DEFAULT
|| kind
== LOW_BOUND_DEFAULT_EXCLUSIVE
1168 || kind
== NONE_BOUND_DEFAULT
|| kind
== NONE_BOUND_DEFAULT_EXCLUSIVE
)
1169 high
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1170 bool inclusive
= (kind
== NONE_BOUND_DEFAULT
|| kind
== LOW_BOUND_DEFAULT
);
1172 if (noside
== EVAL_SKIP
)
1173 return value_from_longest (builtin_type (exp
->gdbarch
)->builtin_int
, 1);
1180 name
= "std::ops::RangeFull";
1184 index_type
= value_type (high
);
1186 ? "std::ops::RangeToInclusive" : "std::ops::RangeTo");
1193 index_type
= value_type (low
);
1194 name
= "std::ops::RangeFrom";
1198 if (!types_equal (value_type (low
), value_type (high
)))
1199 error (_("Range expression with different types"));
1200 index_type
= value_type (low
);
1201 name
= inclusive
? "std::ops::RangeInclusive" : "std::ops::Range";
1205 /* If we don't have an index type, just allocate this on the
1206 arch. Here any type will do. */
1207 temp_type
= (index_type
== NULL
1208 ? language_bool_type (exp
->language_defn
, exp
->gdbarch
)
1210 /* It would be nicer to cache the range type. */
1211 range_type
= rust_composite_type (temp_type
, name
,
1212 low
== NULL
? NULL
: "start", index_type
,
1213 high
== NULL
? NULL
: "end", index_type
);
1215 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1216 return value_zero (range_type
, lval_memory
);
1218 addrval
= value_allocate_space_in_inferior (TYPE_LENGTH (range_type
));
1219 addr
= value_as_long (addrval
);
1220 result
= value_at_lazy (range_type
, addr
);
1224 struct value
*start
= value_struct_elt (&result
, NULL
, "start", NULL
,
1227 value_assign (start
, low
);
1232 struct value
*end
= value_struct_elt (&result
, NULL
, "end", NULL
,
1235 value_assign (end
, high
);
1238 result
= value_at_lazy (range_type
, addr
);
1242 /* A helper function to compute the range and kind given a range
1243 value. TYPE is the type of the range value. RANGE is the range
1244 value. LOW, HIGH, and KIND are out parameters. The LOW and HIGH
1245 parameters might be filled in, or might not be, depending on the
1246 kind of range this is. KIND will always be set to the appropriate
1247 value describing the kind of range, and this can be used to
1248 determine whether LOW or HIGH are valid. */
1251 rust_compute_range (struct type
*type
, struct value
*range
,
1252 LONGEST
*low
, LONGEST
*high
,
1253 enum range_type
*kind
)
1259 *kind
= BOTH_BOUND_DEFAULT
;
1261 if (type
->num_fields () == 0)
1265 if (strcmp (TYPE_FIELD_NAME (type
, 0), "start") == 0)
1267 *kind
= HIGH_BOUND_DEFAULT
;
1268 *low
= value_as_long (value_field (range
, 0));
1271 if (type
->num_fields () > i
1272 && strcmp (TYPE_FIELD_NAME (type
, i
), "end") == 0)
1274 *kind
= (*kind
== BOTH_BOUND_DEFAULT
1275 ? LOW_BOUND_DEFAULT
: NONE_BOUND_DEFAULT
);
1276 *high
= value_as_long (value_field (range
, i
));
1278 if (rust_inclusive_range_type_p (type
))
1283 /* A helper for rust_evaluate_subexp that handles BINOP_SUBSCRIPT. */
1285 static struct value
*
1286 rust_subscript (struct expression
*exp
, int *pos
, enum noside noside
,
1289 struct value
*lhs
, *rhs
, *result
;
1290 struct type
*rhstype
;
1291 LONGEST low
, high_bound
;
1292 /* Initialized to appease the compiler. */
1293 enum range_type kind
= BOTH_BOUND_DEFAULT
;
1298 lhs
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1299 rhs
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1301 if (noside
== EVAL_SKIP
)
1304 rhstype
= check_typedef (value_type (rhs
));
1305 if (rust_range_type_p (rhstype
))
1308 error (_("Can't take slice of array without '&'"));
1309 rust_compute_range (rhstype
, rhs
, &low
, &high
, &kind
);
1313 low
= value_as_long (rhs
);
1315 struct type
*type
= check_typedef (value_type (lhs
));
1316 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1318 struct type
*base_type
= nullptr;
1319 if (type
->code () == TYPE_CODE_ARRAY
)
1320 base_type
= TYPE_TARGET_TYPE (type
);
1321 else if (rust_slice_type_p (type
))
1323 for (int i
= 0; i
< type
->num_fields (); ++i
)
1325 if (strcmp (TYPE_FIELD_NAME (type
, i
), "data_ptr") == 0)
1327 base_type
= TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type
, i
));
1331 if (base_type
== nullptr)
1332 error (_("Could not find 'data_ptr' in slice type"));
1334 else if (type
->code () == TYPE_CODE_PTR
)
1335 base_type
= TYPE_TARGET_TYPE (type
);
1337 error (_("Cannot subscript non-array type"));
1339 struct type
*new_type
;
1342 if (rust_slice_type_p (type
))
1347 = language_lookup_primitive_type (exp
->language_defn
,
1350 new_type
= rust_slice_type ("&[*gdb*]", base_type
, usize
);
1354 new_type
= base_type
;
1356 return value_zero (new_type
, VALUE_LVAL (lhs
));
1363 if (type
->code () == TYPE_CODE_ARRAY
)
1366 if (!get_array_bounds (type
, &low_bound
, &high_bound
))
1367 error (_("Can't compute array bounds"));
1369 error (_("Found array with non-zero lower bound"));
1372 else if (rust_slice_type_p (type
))
1376 base
= value_struct_elt (&lhs
, NULL
, "data_ptr", NULL
, "slice");
1377 len
= value_struct_elt (&lhs
, NULL
, "length", NULL
, "slice");
1379 high_bound
= value_as_long (len
);
1381 else if (type
->code () == TYPE_CODE_PTR
)
1385 high_bound
= LONGEST_MAX
;
1388 error (_("Cannot subscript non-array type"));
1391 && (kind
== BOTH_BOUND_DEFAULT
|| kind
== LOW_BOUND_DEFAULT
))
1394 error (_("Index less than zero"));
1395 if (low
> high_bound
)
1396 error (_("Index greater than length"));
1398 result
= value_subscript (base
, low
);
1405 struct type
*usize
, *slice
;
1407 struct value
*addrval
, *tem
;
1409 if (kind
== BOTH_BOUND_DEFAULT
|| kind
== HIGH_BOUND_DEFAULT
)
1412 error (_("High index less than zero"));
1414 error (_("Low index greater than high index"));
1415 if (high
> high_bound
)
1416 error (_("High index greater than length"));
1418 usize
= language_lookup_primitive_type (exp
->language_defn
,
1421 const char *new_name
= ((type
!= nullptr
1422 && rust_slice_type_p (type
))
1423 ? type
->name () : "&[*gdb*]");
1425 slice
= rust_slice_type (new_name
, value_type (result
), usize
);
1427 addrval
= value_allocate_space_in_inferior (TYPE_LENGTH (slice
));
1428 addr
= value_as_long (addrval
);
1429 tem
= value_at_lazy (slice
, addr
);
1431 value_assign (value_field (tem
, 0), value_addr (result
));
1432 value_assign (value_field (tem
, 1),
1433 value_from_longest (usize
, high
- low
));
1435 result
= value_at_lazy (slice
, addr
);
1438 result
= value_addr (result
);
1444 /* evaluate_exp implementation for Rust. */
1446 static struct value
*
1447 rust_evaluate_subexp (struct type
*expect_type
, struct expression
*exp
,
1448 int *pos
, enum noside noside
)
1450 struct value
*result
;
1452 switch (exp
->elts
[*pos
].opcode
)
1456 if (noside
!= EVAL_NORMAL
)
1457 result
= evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
1461 struct value
*value
= evaluate_subexp (expect_type
, exp
, pos
,
1464 struct value
*trait_ptr
= rust_get_trait_object_pointer (value
);
1465 if (trait_ptr
!= NULL
)
1468 result
= value_ind (value
);
1473 case UNOP_COMPLEMENT
:
1475 struct value
*value
;
1478 value
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1479 if (noside
== EVAL_SKIP
)
1481 /* Preserving the type is enough. */
1484 if (value_type (value
)->code () == TYPE_CODE_BOOL
)
1485 result
= value_from_longest (value_type (value
),
1486 value_logical_not (value
));
1488 result
= value_complement (value
);
1492 case BINOP_SUBSCRIPT
:
1493 result
= rust_subscript (exp
, pos
, noside
, 0);
1497 result
= rust_evaluate_funcall (exp
, pos
, noside
);
1503 struct type
*type
= exp
->elts
[pc
+ 1].type
;
1504 int arglen
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
1507 struct value
*addrval
= NULL
;
1511 if (noside
== EVAL_NORMAL
)
1513 addrval
= value_allocate_space_in_inferior (TYPE_LENGTH (type
));
1514 addr
= value_as_long (addrval
);
1515 result
= value_at_lazy (type
, addr
);
1518 if (arglen
> 0 && exp
->elts
[*pos
].opcode
== OP_OTHERS
)
1523 init
= rust_evaluate_subexp (NULL
, exp
, pos
, noside
);
1524 if (noside
== EVAL_NORMAL
)
1526 /* This isn't quite right but will do for the time
1527 being, seeing that we can't implement the Copy
1529 value_assign (result
, init
);
1535 gdb_assert (arglen
% 2 == 0);
1536 for (i
= 0; i
< arglen
; i
+= 2)
1539 const char *fieldname
;
1540 struct value
*value
, *field
;
1542 gdb_assert (exp
->elts
[*pos
].opcode
== OP_NAME
);
1544 len
= longest_to_int (exp
->elts
[*pos
].longconst
);
1546 fieldname
= &exp
->elts
[*pos
].string
;
1547 *pos
+= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
1549 value
= rust_evaluate_subexp (NULL
, exp
, pos
, noside
);
1550 if (noside
== EVAL_NORMAL
)
1552 field
= value_struct_elt (&result
, NULL
, fieldname
, NULL
,
1554 value_assign (field
, value
);
1558 if (noside
== EVAL_SKIP
)
1559 return value_from_longest (builtin_type (exp
->gdbarch
)->builtin_int
,
1561 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1562 result
= allocate_value (type
);
1564 result
= value_at_lazy (type
, addr
);
1573 struct value
*ncopies
;
1575 elt
= rust_evaluate_subexp (NULL
, exp
, pos
, noside
);
1576 ncopies
= rust_evaluate_subexp (NULL
, exp
, pos
, noside
);
1577 copies
= value_as_long (ncopies
);
1579 error (_("Array with negative number of elements"));
1581 if (noside
== EVAL_NORMAL
)
1584 std::vector
<struct value
*> eltvec (copies
);
1586 for (i
= 0; i
< copies
; ++i
)
1588 result
= value_array (0, copies
- 1, eltvec
.data ());
1592 struct type
*arraytype
1593 = lookup_array_range_type (value_type (elt
), 0, copies
- 1);
1594 result
= allocate_value (arraytype
);
1599 case STRUCTOP_ANONYMOUS
:
1601 /* Anonymous field access, i.e. foo.1. */
1603 int pc
, field_number
, nfields
;
1607 field_number
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1609 lhs
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1611 type
= value_type (lhs
);
1613 if (type
->code () == TYPE_CODE_STRUCT
)
1615 struct type
*outer_type
= NULL
;
1617 if (rust_enum_p (type
))
1619 gdb::array_view
<const gdb_byte
> view (value_contents (lhs
),
1620 TYPE_LENGTH (type
));
1621 type
= resolve_dynamic_type (type
, view
, value_address (lhs
));
1623 if (rust_empty_enum_p (type
))
1624 error (_("Cannot access field %d of empty enum %s"),
1625 field_number
, type
->name ());
1627 int fieldno
= rust_enum_variant (type
);
1628 lhs
= value_primitive_field (lhs
, 0, fieldno
, type
);
1630 type
= value_type (lhs
);
1633 /* Tuples and tuple structs */
1634 nfields
= type
->num_fields ();
1636 if (field_number
>= nfields
|| field_number
< 0)
1638 if (outer_type
!= NULL
)
1639 error(_("Cannot access field %d of variant %s::%s, "
1640 "there are only %d fields"),
1641 field_number
, outer_type
->name (),
1642 rust_last_path_segment (type
->name ()),
1645 error(_("Cannot access field %d of %s, "
1646 "there are only %d fields"),
1647 field_number
, type
->name (), nfields
);
1650 /* Tuples are tuple structs too. */
1651 if (!rust_tuple_struct_type_p (type
))
1653 if (outer_type
!= NULL
)
1654 error(_("Variant %s::%s is not a tuple variant"),
1655 outer_type
->name (),
1656 rust_last_path_segment (type
->name ()));
1658 error(_("Attempting to access anonymous field %d "
1659 "of %s, which is not a tuple, tuple struct, or "
1660 "tuple-like variant"),
1661 field_number
, type
->name ());
1664 result
= value_primitive_field (lhs
, 0, field_number
, type
);
1667 error(_("Anonymous field access is only allowed on tuples, \
1668 tuple structs, and tuple-like enum variants"));
1672 case STRUCTOP_STRUCT
:
1679 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1680 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1681 lhs
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1683 const char *field_name
= &exp
->elts
[pc
+ 2].string
;
1684 type
= value_type (lhs
);
1685 if (type
->code () == TYPE_CODE_STRUCT
&& rust_enum_p (type
))
1687 gdb::array_view
<const gdb_byte
> view (value_contents (lhs
),
1688 TYPE_LENGTH (type
));
1689 type
= resolve_dynamic_type (type
, view
, value_address (lhs
));
1691 if (rust_empty_enum_p (type
))
1692 error (_("Cannot access field %s of empty enum %s"),
1693 field_name
, type
->name ());
1695 int fieldno
= rust_enum_variant (type
);
1696 lhs
= value_primitive_field (lhs
, 0, fieldno
, type
);
1698 struct type
*outer_type
= type
;
1699 type
= value_type (lhs
);
1700 if (rust_tuple_type_p (type
) || rust_tuple_struct_type_p (type
))
1701 error (_("Attempting to access named field %s of tuple "
1702 "variant %s::%s, which has only anonymous fields"),
1703 field_name
, outer_type
->name (),
1704 rust_last_path_segment (type
->name ()));
1708 result
= value_struct_elt (&lhs
, NULL
, field_name
,
1711 catch (const gdb_exception_error
&except
)
1713 error (_("Could not find field %s of struct variant %s::%s"),
1714 field_name
, outer_type
->name (),
1715 rust_last_path_segment (type
->name ()));
1719 result
= value_struct_elt (&lhs
, NULL
, field_name
, NULL
, "structure");
1720 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1721 result
= value_zero (value_type (result
), VALUE_LVAL (result
));
1726 result
= rust_range (exp
, pos
, noside
);
1730 /* We might have &array[range], in which case we need to make a
1732 if (exp
->elts
[*pos
+ 1].opcode
== BINOP_SUBSCRIPT
)
1735 result
= rust_subscript (exp
, pos
, noside
, 1);
1740 result
= evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
1747 /* operator_length implementation for Rust. */
1750 rust_operator_length (const struct expression
*exp
, int pc
, int *oplenp
,
1756 switch (exp
->elts
[pc
- 1].opcode
)
1759 /* We handle aggregate as a type and argument count. The first
1760 argument might be OP_OTHERS. After that the arguments
1761 alternate: first an OP_NAME, then an expression. */
1763 args
= longest_to_int (exp
->elts
[pc
- 2].longconst
);
1771 case STRUCTOP_ANONYMOUS
:
1782 operator_length_standard (exp
, pc
, oplenp
, argsp
);
1790 /* op_name implementation for Rust. */
1793 rust_op_name (enum exp_opcode opcode
)
1798 return "OP_AGGREGATE";
1802 return op_name_standard (opcode
);
1806 /* dump_subexp_body implementation for Rust. */
1809 rust_dump_subexp_body (struct expression
*exp
, struct ui_file
*stream
,
1812 switch (exp
->elts
[elt
].opcode
)
1816 int length
= longest_to_int (exp
->elts
[elt
+ 2].longconst
);
1819 fprintf_filtered (stream
, "Type @");
1820 gdb_print_host_address (exp
->elts
[elt
+ 1].type
, stream
);
1821 fprintf_filtered (stream
, " (");
1822 type_print (exp
->elts
[elt
+ 1].type
, NULL
, stream
, 0);
1823 fprintf_filtered (stream
, "), length %d", length
);
1826 for (i
= 0; i
< length
; ++i
)
1827 elt
= dump_subexp (exp
, stream
, elt
);
1834 LONGEST len
= exp
->elts
[elt
+ 1].longconst
;
1836 fprintf_filtered (stream
, "%s: %s",
1837 (exp
->elts
[elt
].opcode
== OP_STRING
1838 ? "string" : "name"),
1839 &exp
->elts
[elt
+ 2].string
);
1840 elt
+= 4 + BYTES_TO_EXP_ELEM (len
+ 1);
1845 elt
= dump_subexp (exp
, stream
, elt
+ 1);
1848 case STRUCTOP_ANONYMOUS
:
1852 field_number
= longest_to_int (exp
->elts
[elt
+ 1].longconst
);
1854 fprintf_filtered (stream
, "Field number: %d", field_number
);
1855 elt
= dump_subexp (exp
, stream
, elt
+ 3);
1864 elt
= dump_subexp_body_standard (exp
, stream
, elt
);
1871 /* print_subexp implementation for Rust. */
1874 rust_print_subexp (struct expression
*exp
, int *pos
, struct ui_file
*stream
,
1875 enum precedence prec
)
1877 switch (exp
->elts
[*pos
].opcode
)
1881 int length
= longest_to_int (exp
->elts
[*pos
+ 2].longconst
);
1884 type_print (exp
->elts
[*pos
+ 1].type
, "", stream
, 0);
1885 fputs_filtered (" { ", stream
);
1888 for (i
= 0; i
< length
; ++i
)
1890 rust_print_subexp (exp
, pos
, stream
, prec
);
1891 fputs_filtered (", ", stream
);
1893 fputs_filtered (" }", stream
);
1899 LONGEST len
= exp
->elts
[*pos
+ 1].longconst
;
1901 fputs_filtered (&exp
->elts
[*pos
+ 2].string
, stream
);
1902 *pos
+= 4 + BYTES_TO_EXP_ELEM (len
+ 1);
1908 fputs_filtered ("<<others>> (", stream
);
1910 rust_print_subexp (exp
, pos
, stream
, prec
);
1911 fputs_filtered (")", stream
);
1915 case STRUCTOP_ANONYMOUS
:
1917 int tem
= longest_to_int (exp
->elts
[*pos
+ 1].longconst
);
1920 print_subexp (exp
, pos
, stream
, PREC_SUFFIX
);
1921 fprintf_filtered (stream
, ".%d", tem
);
1927 fprintf_filtered (stream
, "[");
1928 rust_print_subexp (exp
, pos
, stream
, prec
);
1929 fprintf_filtered (stream
, "; ");
1930 rust_print_subexp (exp
, pos
, stream
, prec
);
1931 fprintf_filtered (stream
, "]");
1935 print_subexp_standard (exp
, pos
, stream
, prec
);
1940 /* operator_check implementation for Rust. */
1943 rust_operator_check (struct expression
*exp
, int pos
,
1944 int (*objfile_func
) (struct objfile
*objfile
,
1948 switch (exp
->elts
[pos
].opcode
)
1952 struct type
*type
= exp
->elts
[pos
+ 1].type
;
1953 struct objfile
*objfile
= TYPE_OBJFILE (type
);
1955 if (objfile
!= NULL
&& (*objfile_func
) (objfile
, data
))
1966 return operator_check_standard (exp
, pos
, objfile_func
, data
);
1974 /* Implementation of la_lookup_symbol_nonlocal for Rust. */
1976 static struct block_symbol
1977 rust_lookup_symbol_nonlocal (const struct language_defn
*langdef
,
1979 const struct block
*block
,
1980 const domain_enum domain
)
1982 struct block_symbol result
= {};
1984 if (symbol_lookup_debug
)
1986 fprintf_unfiltered (gdb_stdlog
,
1987 "rust_lookup_symbol_non_local"
1988 " (%s, %s (scope %s), %s)\n",
1989 name
, host_address_to_string (block
),
1990 block_scope (block
), domain_name (domain
));
1993 /* Look up bare names in the block's scope. */
1994 std::string scopedname
;
1995 if (name
[cp_find_first_component (name
)] == '\0')
1997 const char *scope
= block_scope (block
);
1999 if (scope
[0] != '\0')
2001 scopedname
= std::string (scope
) + "::" + name
;
2002 name
= scopedname
.c_str ();
2010 result
= lookup_symbol_in_static_block (name
, block
, domain
);
2011 if (result
.symbol
== NULL
)
2012 result
= lookup_global_symbol (name
, block
, domain
);
2019 /* la_sniff_from_mangled_name for Rust. */
2022 rust_sniff_from_mangled_name (const char *mangled
, char **demangled
)
2024 *demangled
= gdb_demangle (mangled
, DMGL_PARAMS
| DMGL_ANSI
);
2025 return *demangled
!= NULL
;
2030 /* la_watch_location_expression for Rust. */
2032 static gdb::unique_xmalloc_ptr
<char>
2033 rust_watch_location_expression (struct type
*type
, CORE_ADDR addr
)
2035 type
= check_typedef (TYPE_TARGET_TYPE (check_typedef (type
)));
2036 std::string name
= type_to_string (type
);
2037 return gdb::unique_xmalloc_ptr
<char>
2038 (xstrprintf ("*(%s as *mut %s)", core_addr_to_string (addr
),
2044 static const struct exp_descriptor exp_descriptor_rust
=
2047 rust_operator_length
,
2048 rust_operator_check
,
2050 rust_dump_subexp_body
,
2051 rust_evaluate_subexp
2054 static const char *rust_extensions
[] =
2059 /* Constant data representing the Rust language. */
2061 extern const struct language_data rust_language_data
=
2071 &exp_descriptor_rust
,
2074 rust_printchar
, /* Print a character constant */
2075 rust_printstr
, /* Function to print string constant */
2076 rust_emitchar
, /* Print a single char */
2077 rust_print_type
, /* Print a type using appropriate syntax */
2078 rust_print_typedef
, /* Print a typedef using appropriate syntax */
2079 rust_value_print_inner
, /* la_value_print_inner */
2080 c_value_print
, /* Print a top-level value */
2081 NULL
, /* Language specific skip_trampoline */
2082 NULL
, /* name_of_this */
2083 false, /* la_store_sym_names_in_linkage_form_p */
2084 rust_lookup_symbol_nonlocal
, /* lookup_symbol_nonlocal */
2085 gdb_demangle
, /* Language specific symbol demangler */
2086 rust_sniff_from_mangled_name
,
2087 NULL
, /* Language specific
2088 class_name_from_physname */
2089 c_op_print_tab
, /* expression operators for printing */
2090 1, /* c-style arrays */
2091 0, /* String lower bound */
2092 default_word_break_characters
,
2093 default_collect_symbol_completion_matches
,
2094 rust_watch_location_expression
,
2095 NULL
, /* la_get_symbol_name_matcher */
2096 default_search_name_hash
,
2097 &default_varobj_ops
,
2099 rust_is_string_type_p
,
2100 "{...}" /* la_struct_too_deep_ellipsis */
2103 /* Class representing the Rust language. */
2105 class rust_language
: public language_defn
2109 : language_defn (language_rust
, rust_language_data
)
2112 /* See language.h. */
2113 void language_arch_info (struct gdbarch
*gdbarch
,
2114 struct language_arch_info
*lai
) const override
2116 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
2119 = GDBARCH_OBSTACK_CALLOC (gdbarch
, nr_rust_primitive_types
+ 1,
2122 types
[rust_primitive_bool
] = arch_boolean_type (gdbarch
, 8, 1, "bool");
2123 types
[rust_primitive_char
] = arch_character_type (gdbarch
, 32, 1, "char");
2124 types
[rust_primitive_i8
] = arch_integer_type (gdbarch
, 8, 0, "i8");
2125 types
[rust_primitive_u8
] = arch_integer_type (gdbarch
, 8, 1, "u8");
2126 types
[rust_primitive_i16
] = arch_integer_type (gdbarch
, 16, 0, "i16");
2127 types
[rust_primitive_u16
] = arch_integer_type (gdbarch
, 16, 1, "u16");
2128 types
[rust_primitive_i32
] = arch_integer_type (gdbarch
, 32, 0, "i32");
2129 types
[rust_primitive_u32
] = arch_integer_type (gdbarch
, 32, 1, "u32");
2130 types
[rust_primitive_i64
] = arch_integer_type (gdbarch
, 64, 0, "i64");
2131 types
[rust_primitive_u64
] = arch_integer_type (gdbarch
, 64, 1, "u64");
2133 unsigned int length
= 8 * TYPE_LENGTH (builtin
->builtin_data_ptr
);
2134 types
[rust_primitive_isize
] = arch_integer_type (gdbarch
, length
, 0, "isize");
2135 types
[rust_primitive_usize
] = arch_integer_type (gdbarch
, length
, 1, "usize");
2137 types
[rust_primitive_f32
] = arch_float_type (gdbarch
, 32, "f32",
2138 floatformats_ieee_single
);
2139 types
[rust_primitive_f64
] = arch_float_type (gdbarch
, 64, "f64",
2140 floatformats_ieee_double
);
2142 types
[rust_primitive_unit
] = arch_integer_type (gdbarch
, 0, 1, "()");
2144 struct type
*tem
= make_cv_type (1, 0, types
[rust_primitive_u8
], NULL
);
2145 types
[rust_primitive_str
] = rust_slice_type ("&str", tem
,
2146 types
[rust_primitive_usize
]);
2148 lai
->primitive_type_vector
= types
;
2149 lai
->bool_type_default
= types
[rust_primitive_bool
];
2150 lai
->string_char_type
= types
[rust_primitive_u8
];
2154 /* Single instance of the Rust language class. */
2156 static rust_language rust_language_defn
;