1 /* Support for printing Modula 2 types for GDB, the GNU debugger.
2 Copyright (C) 1986-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "gdb_obstack.h"
21 #include "bfd.h" /* Binary File Description */
24 #include "expression.h"
32 #include "typeprint.h"
35 static void m2_print_bounds (struct type
*type
,
36 struct ui_file
*stream
, int show
, int level
,
39 static void m2_typedef (struct type
*, struct ui_file
*, int, int,
40 const struct type_print_options
*);
41 static void m2_array (struct type
*, struct ui_file
*, int, int,
42 const struct type_print_options
*);
43 static void m2_pointer (struct type
*, struct ui_file
*, int, int,
44 const struct type_print_options
*);
45 static void m2_ref (struct type
*, struct ui_file
*, int, int,
46 const struct type_print_options
*);
47 static void m2_procedure (struct type
*, struct ui_file
*, int, int,
48 const struct type_print_options
*);
49 static void m2_union (struct type
*, struct ui_file
*);
50 static void m2_enum (struct type
*, struct ui_file
*, int, int);
51 static void m2_range (struct type
*, struct ui_file
*, int, int,
52 const struct type_print_options
*);
53 static void m2_type_name (struct type
*type
, struct ui_file
*stream
);
54 static void m2_short_set (struct type
*type
, struct ui_file
*stream
,
56 static int m2_long_set (struct type
*type
, struct ui_file
*stream
,
57 int show
, int level
, const struct type_print_options
*flags
);
58 static int m2_unbounded_array (struct type
*type
, struct ui_file
*stream
,
60 const struct type_print_options
*flags
);
61 static void m2_record_fields (struct type
*type
, struct ui_file
*stream
,
62 int show
, int level
, const struct type_print_options
*flags
);
63 static void m2_unknown (const char *s
, struct type
*type
,
64 struct ui_file
*stream
, int show
, int level
);
66 int m2_is_long_set (struct type
*type
);
67 int m2_is_long_set_of_type (struct type
*type
, struct type
**of_type
);
68 int m2_is_unbounded_array (struct type
*type
);
72 m2_print_type (struct type
*type
, const char *varstring
,
73 struct ui_file
*stream
,
75 const struct type_print_options
*flags
)
77 type
= check_typedef (type
);
84 fputs_filtered (_("<type unknown>"), stream
);
88 switch (TYPE_CODE (type
))
91 m2_short_set(type
, stream
, show
, level
);
94 case TYPE_CODE_STRUCT
:
95 if (m2_long_set (type
, stream
, show
, level
, flags
)
96 || m2_unbounded_array (type
, stream
, show
, level
, flags
))
98 m2_record_fields (type
, stream
, show
, level
, flags
);
101 case TYPE_CODE_TYPEDEF
:
102 m2_typedef (type
, stream
, show
, level
, flags
);
105 case TYPE_CODE_ARRAY
:
106 m2_array (type
, stream
, show
, level
, flags
);
110 m2_pointer (type
, stream
, show
, level
, flags
);
114 m2_ref (type
, stream
, show
, level
, flags
);
117 case TYPE_CODE_METHOD
:
118 m2_unknown (_("method"), type
, stream
, show
, level
);
122 m2_procedure (type
, stream
, show
, level
, flags
);
125 case TYPE_CODE_UNION
:
126 m2_union (type
, stream
);
130 m2_enum (type
, stream
, show
, level
);
136 case TYPE_CODE_UNDEF
:
137 /* i18n: Do not translate the "struct" part! */
138 m2_unknown (_("undef"), type
, stream
, show
, level
);
141 case TYPE_CODE_ERROR
:
142 m2_unknown (_("error"), type
, stream
, show
, level
);
145 case TYPE_CODE_RANGE
:
146 m2_range (type
, stream
, show
, level
, flags
);
150 m2_type_name (type
, stream
);
155 /* Print a typedef using M2 syntax. TYPE is the underlying type.
156 NEW_SYMBOL is the symbol naming the type. STREAM is the stream on
160 m2_print_typedef (struct type
*type
, struct symbol
*new_symbol
,
161 struct ui_file
*stream
)
163 type
= check_typedef (type
);
164 fprintf_filtered (stream
, "TYPE ");
165 if (!TYPE_NAME (SYMBOL_TYPE (new_symbol
))
166 || strcmp (TYPE_NAME ((SYMBOL_TYPE (new_symbol
))),
167 SYMBOL_LINKAGE_NAME (new_symbol
)) != 0)
168 fprintf_filtered (stream
, "%s = ", SYMBOL_PRINT_NAME (new_symbol
));
170 fprintf_filtered (stream
, "<builtin> = ");
171 type_print (type
, "", stream
, 0);
172 fprintf_filtered (stream
, ";\n");
175 /* m2_type_name - if a, type, has a name then print it. */
178 m2_type_name (struct type
*type
, struct ui_file
*stream
)
180 if (TYPE_NAME (type
) != NULL
)
181 fputs_filtered (TYPE_NAME (type
), stream
);
184 /* m2_range - displays a Modula-2 subrange type. */
187 m2_range (struct type
*type
, struct ui_file
*stream
, int show
,
188 int level
, const struct type_print_options
*flags
)
190 if (TYPE_HIGH_BOUND (type
) == TYPE_LOW_BOUND (type
))
192 /* FIXME: TYPE_TARGET_TYPE used to be TYPE_DOMAIN_TYPE but that was
193 wrong. Not sure if TYPE_TARGET_TYPE is correct though. */
194 m2_print_type (TYPE_TARGET_TYPE (type
), "", stream
, show
, level
,
199 struct type
*target
= TYPE_TARGET_TYPE (type
);
201 fprintf_filtered (stream
, "[");
202 print_type_scalar (target
, TYPE_LOW_BOUND (type
), stream
);
203 fprintf_filtered (stream
, "..");
204 print_type_scalar (target
, TYPE_HIGH_BOUND (type
), stream
);
205 fprintf_filtered (stream
, "]");
210 m2_typedef (struct type
*type
, struct ui_file
*stream
, int show
,
211 int level
, const struct type_print_options
*flags
)
213 if (TYPE_NAME (type
) != NULL
)
215 fputs_filtered (TYPE_NAME (type
), stream
);
216 fputs_filtered (" = ", stream
);
218 m2_print_type (TYPE_TARGET_TYPE (type
), "", stream
, show
, level
, flags
);
221 /* m2_array - prints out a Modula-2 ARRAY ... OF type. */
223 static void m2_array (struct type
*type
, struct ui_file
*stream
,
224 int show
, int level
, const struct type_print_options
*flags
)
226 fprintf_filtered (stream
, "ARRAY [");
227 if (TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0
228 && !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type
))
230 if (TYPE_INDEX_TYPE (type
) != 0)
232 m2_print_bounds (TYPE_INDEX_TYPE (type
), stream
, show
, -1, 0);
233 fprintf_filtered (stream
, "..");
234 m2_print_bounds (TYPE_INDEX_TYPE (type
), stream
, show
, -1, 1);
237 fprintf_filtered (stream
, "%d",
239 / TYPE_LENGTH (TYPE_TARGET_TYPE (type
))));
241 fprintf_filtered (stream
, "] OF ");
242 m2_print_type (TYPE_TARGET_TYPE (type
), "", stream
, show
, level
, flags
);
246 m2_pointer (struct type
*type
, struct ui_file
*stream
, int show
,
247 int level
, const struct type_print_options
*flags
)
249 if (TYPE_CONST (type
))
250 fprintf_filtered (stream
, "[...] : ");
252 fprintf_filtered (stream
, "POINTER TO ");
254 m2_print_type (TYPE_TARGET_TYPE (type
), "", stream
, show
, level
, flags
);
258 m2_ref (struct type
*type
, struct ui_file
*stream
, int show
,
259 int level
, const struct type_print_options
*flags
)
261 fprintf_filtered (stream
, "VAR");
262 m2_print_type (TYPE_TARGET_TYPE (type
), "", stream
, show
, level
, flags
);
266 m2_unknown (const char *s
, struct type
*type
, struct ui_file
*stream
,
269 fprintf_filtered (stream
, "%s %s", s
, _("is unknown"));
272 static void m2_union (struct type
*type
, struct ui_file
*stream
)
274 fprintf_filtered (stream
, "union");
278 m2_procedure (struct type
*type
, struct ui_file
*stream
,
279 int show
, int level
, const struct type_print_options
*flags
)
281 fprintf_filtered (stream
, "PROCEDURE ");
282 m2_type_name (type
, stream
);
283 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) != TYPE_CODE_VOID
)
285 int i
, len
= TYPE_NFIELDS (type
);
287 fprintf_filtered (stream
, " (");
288 for (i
= 0; i
< len
; i
++)
292 fputs_filtered (", ", stream
);
295 m2_print_type (TYPE_FIELD_TYPE (type
, i
), "", stream
, -1, 0, flags
);
297 if (TYPE_TARGET_TYPE (type
) != NULL
)
299 fprintf_filtered (stream
, " : ");
300 m2_print_type (TYPE_TARGET_TYPE (type
), "", stream
, 0, 0, flags
);
306 m2_print_bounds (struct type
*type
,
307 struct ui_file
*stream
, int show
, int level
,
310 struct type
*target
= TYPE_TARGET_TYPE (type
);
312 if (TYPE_NFIELDS(type
) == 0)
316 print_type_scalar (target
, TYPE_HIGH_BOUND (type
), stream
);
318 print_type_scalar (target
, TYPE_LOW_BOUND (type
), stream
);
322 m2_short_set (struct type
*type
, struct ui_file
*stream
, int show
, int level
)
324 fprintf_filtered(stream
, "SET [");
325 m2_print_bounds (TYPE_INDEX_TYPE (type
), stream
,
328 fprintf_filtered(stream
, "..");
329 m2_print_bounds (TYPE_INDEX_TYPE (type
), stream
,
331 fprintf_filtered(stream
, "]");
335 m2_is_long_set (struct type
*type
)
337 LONGEST previous_high
= 0; /* Unnecessary initialization
338 keeps gcc -Wall happy. */
342 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
345 /* check if all fields of the RECORD are consecutive sets. */
347 len
= TYPE_NFIELDS (type
);
348 for (i
= TYPE_N_BASECLASSES (type
); i
< len
; i
++)
350 if (TYPE_FIELD_TYPE (type
, i
) == NULL
)
352 if (TYPE_CODE (TYPE_FIELD_TYPE (type
, i
)) != TYPE_CODE_SET
)
354 if (TYPE_FIELD_NAME (type
, i
) != NULL
355 && (strcmp (TYPE_FIELD_NAME (type
, i
), "") != 0))
357 range
= TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type
, i
));
358 if ((i
> TYPE_N_BASECLASSES (type
))
359 && previous_high
+ 1 != TYPE_LOW_BOUND (range
))
361 previous_high
= TYPE_HIGH_BOUND (range
);
368 /* m2_get_discrete_bounds - a wrapper for get_discrete_bounds which
369 understands that CHARs might be signed.
370 This should be integrated into gdbtypes.c
371 inside get_discrete_bounds. */
374 m2_get_discrete_bounds (struct type
*type
, LONGEST
*lowp
, LONGEST
*highp
)
376 type
= check_typedef (type
);
377 switch (TYPE_CODE (type
))
380 if (TYPE_LENGTH (type
) < sizeof (LONGEST
))
382 if (!TYPE_UNSIGNED (type
))
384 *lowp
= -(1 << (TYPE_LENGTH (type
) * TARGET_CHAR_BIT
- 1));
391 return get_discrete_bounds (type
, lowp
, highp
);
395 /* m2_is_long_set_of_type - returns TRUE if the long set was declared as
396 SET OF <oftype> of_type is assigned to the
400 m2_is_long_set_of_type (struct type
*type
, struct type
**of_type
)
408 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
410 len
= TYPE_NFIELDS (type
);
411 i
= TYPE_N_BASECLASSES (type
);
414 range
= TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type
, i
));
415 target
= TYPE_TARGET_TYPE (range
);
417 l1
= TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type
, i
)));
418 h1
= TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type
, len
-1)));
420 if (m2_get_discrete_bounds (target
, &l2
, &h2
) >= 0)
421 return (l1
== l2
&& h1
== h2
);
422 error (_("long_set failed to find discrete bounds for its subtype"));
425 error (_("expecting long_set"));
430 m2_long_set (struct type
*type
, struct ui_file
*stream
, int show
, int level
,
431 const struct type_print_options
*flags
)
433 struct type
*of_type
;
435 int len
= TYPE_NFIELDS (type
);
439 if (m2_is_long_set (type
))
441 if (TYPE_TAG_NAME (type
) != NULL
)
443 fputs_filtered (TYPE_TAG_NAME (type
), stream
);
447 else if (TYPE_NAME (type
) != NULL
)
449 fputs_filtered (TYPE_NAME (type
), stream
);
454 if (TYPE_TAG_NAME (type
) != NULL
|| TYPE_NAME (type
) != NULL
)
455 fputs_filtered (" = ", stream
);
457 if (get_long_set_bounds (type
, &low
, &high
))
459 fprintf_filtered(stream
, "SET OF ");
460 i
= TYPE_N_BASECLASSES (type
);
461 if (m2_is_long_set_of_type (type
, &of_type
))
462 m2_print_type (of_type
, "", stream
, show
- 1, level
, flags
);
465 fprintf_filtered(stream
, "[");
466 m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type
, i
)),
467 stream
, show
- 1, level
, 0);
469 fprintf_filtered(stream
, "..");
471 m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type
, len
-1)),
472 stream
, show
- 1, level
, 1);
473 fprintf_filtered(stream
, "]");
477 /* i18n: Do not translate the "SET OF" part! */
478 fprintf_filtered(stream
, _("SET OF <unknown>"));
485 /* m2_is_unbounded_array - returns TRUE if, type, should be regarded
486 as a Modula-2 unbounded ARRAY type. */
489 m2_is_unbounded_array (struct type
*type
)
491 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
494 * check if we have a structure with exactly two fields named
495 * _m2_contents and _m2_high. It also checks to see if the
496 * type of _m2_contents is a pointer. The TYPE_TARGET_TYPE
497 * of the pointer determines the unbounded ARRAY OF type.
499 if (TYPE_NFIELDS (type
) != 2)
501 if (strcmp (TYPE_FIELD_NAME (type
, 0), "_m2_contents") != 0)
503 if (strcmp (TYPE_FIELD_NAME (type
, 1), "_m2_high") != 0)
505 if (TYPE_CODE (TYPE_FIELD_TYPE (type
, 0)) != TYPE_CODE_PTR
)
512 /* m2_unbounded_array - if the struct type matches a Modula-2 unbounded
513 parameter type then display the type as an
514 ARRAY OF type. Returns TRUE if an unbounded
515 array type was detected. */
518 m2_unbounded_array (struct type
*type
, struct ui_file
*stream
, int show
,
519 int level
, const struct type_print_options
*flags
)
521 if (m2_is_unbounded_array (type
))
525 fputs_filtered ("ARRAY OF ", stream
);
526 m2_print_type (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type
, 0)),
527 "", stream
, 0, level
, flags
);
535 m2_record_fields (struct type
*type
, struct ui_file
*stream
, int show
,
536 int level
, const struct type_print_options
*flags
)
538 /* Print the tag if it exists. */
539 if (TYPE_TAG_NAME (type
) != NULL
)
541 if (!startswith (TYPE_TAG_NAME (type
), "$$"))
543 fputs_filtered (TYPE_TAG_NAME (type
), stream
);
545 fprintf_filtered (stream
, " = ");
551 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
552 fprintf_filtered (stream
, "RECORD ... END ");
553 else if (TYPE_CODE (type
) == TYPE_CODE_UNION
)
554 fprintf_filtered (stream
, "CASE ... END ");
559 int len
= TYPE_NFIELDS (type
);
561 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
562 fprintf_filtered (stream
, "RECORD\n");
563 else if (TYPE_CODE (type
) == TYPE_CODE_UNION
)
564 /* i18n: Do not translate "CASE" and "OF". */
565 fprintf_filtered (stream
, _("CASE <variant> OF\n"));
567 for (i
= TYPE_N_BASECLASSES (type
); i
< len
; i
++)
571 print_spaces_filtered (level
+ 4, stream
);
572 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
573 fputs_filtered (" : ", stream
);
574 m2_print_type (TYPE_FIELD_TYPE (type
, i
),
576 stream
, 0, level
+ 4, flags
);
577 if (TYPE_FIELD_PACKED (type
, i
))
579 /* It is a bitfield. This code does not attempt
580 to look at the bitpos and reconstruct filler,
581 unnamed fields. This would lead to misleading
582 results if the compiler does not put out fields
583 for such things (I don't know what it does). */
584 fprintf_filtered (stream
, " : %d",
585 TYPE_FIELD_BITSIZE (type
, i
));
587 fprintf_filtered (stream
, ";\n");
590 fprintfi_filtered (level
, stream
, "END ");
595 m2_enum (struct type
*type
, struct ui_file
*stream
, int show
, int level
)
602 /* If we just printed a tag name, no need to print anything else. */
603 if (TYPE_TAG_NAME (type
) == NULL
)
604 fprintf_filtered (stream
, "(...)");
606 else if (show
> 0 || TYPE_TAG_NAME (type
) == NULL
)
608 fprintf_filtered (stream
, "(");
609 len
= TYPE_NFIELDS (type
);
611 for (i
= 0; i
< len
; i
++)
615 fprintf_filtered (stream
, ", ");
617 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
618 if (lastval
!= TYPE_FIELD_ENUMVAL (type
, i
))
620 fprintf_filtered (stream
, " = %s",
621 plongest (TYPE_FIELD_ENUMVAL (type
, i
)));
622 lastval
= TYPE_FIELD_ENUMVAL (type
, i
);
626 fprintf_filtered (stream
, ")");