1 /* Support for printing Modula 2 values for GDB, the GNU debugger.
2
3 Copyright (C) 1986, 1988, 1989, 1991, 1992, 1996, 1998, 2000, 2005, 2006,
4 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21 #include "defs.h"
22 #include "symtab.h"
23 #include "gdbtypes.h"
24 #include "expression.h"
25 #include "value.h"
26 #include "valprint.h"
27 #include "language.h"
28 #include "typeprint.h"
29 #include "c-lang.h"
30 #include "m2-lang.h"
31 #include "target.h"
32
33 static int print_unpacked_pointer (struct type *type,
34 CORE_ADDR address, CORE_ADDR addr,
35 const struct value_print_options *options,
36 struct ui_file *stream);
37 static void
38 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
39 int embedded_offset, CORE_ADDR address,
40 struct ui_file *stream, int recurse,
41 const struct value *val,
42 const struct value_print_options *options,
43 int len);
44
45
46 /* Print function pointer with inferior address ADDRESS onto stdio
47 stream STREAM. */
48
49 static void
print_function_pointer_address(struct gdbarch * gdbarch,CORE_ADDR address,struct ui_file * stream,int addressprint)50 print_function_pointer_address (struct gdbarch *gdbarch, CORE_ADDR address,
51 struct ui_file *stream, int addressprint)
52 {
53 CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
54 ¤t_target);
55
56 /* If the function pointer is represented by a description, print the
57 address of the description. */
58 if (addressprint && func_addr != address)
59 {
60 fputs_filtered ("@", stream);
61 fputs_filtered (paddress (gdbarch, address), stream);
62 fputs_filtered (": ", stream);
63 }
64 print_address_demangle (gdbarch, func_addr, stream, demangle);
65 }
66
67 /* get_long_set_bounds - assigns the bounds of the long set to low and
68 high. */
69
70 int
get_long_set_bounds(struct type * type,LONGEST * low,LONGEST * high)71 get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
72 {
73 int len, i;
74
75 if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
76 {
77 len = TYPE_NFIELDS (type);
78 i = TYPE_N_BASECLASSES (type);
79 if (len == 0)
80 return 0;
81 *low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
82 *high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
83 len-1)));
84 return 1;
85 }
86 error (_("expecting long_set"));
87 return 0;
88 }
89
90 static void
m2_print_long_set(struct type * type,const gdb_byte * valaddr,int embedded_offset,CORE_ADDR address,struct ui_file * stream)91 m2_print_long_set (struct type *type, const gdb_byte *valaddr,
92 int embedded_offset, CORE_ADDR address,
93 struct ui_file *stream)
94 {
95 int empty_set = 1;
96 int element_seen = 0;
97 LONGEST previous_low = 0;
98 LONGEST previous_high= 0;
99 LONGEST i, low_bound, high_bound;
100 LONGEST field_low, field_high;
101 struct type *range;
102 int len, field;
103 struct type *target;
104 int bitval;
105
106 CHECK_TYPEDEF (type);
107
108 fprintf_filtered (stream, "{");
109 len = TYPE_NFIELDS (type);
110 if (get_long_set_bounds (type, &low_bound, &high_bound))
111 {
112 field = TYPE_N_BASECLASSES (type);
113 range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
114 }
115 else
116 {
117 fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
118 return;
119 }
120
121 target = TYPE_TARGET_TYPE (range);
122
123 if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
124 {
125 for (i = low_bound; i <= high_bound; i++)
126 {
127 bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
128 (TYPE_FIELD_BITPOS (type, field) / 8) +
129 valaddr + embedded_offset, i);
130 if (bitval < 0)
131 error (_("bit test is out of range"));
132 else if (bitval > 0)
133 {
134 previous_high = i;
135 if (! element_seen)
136 {
137 if (! empty_set)
138 fprintf_filtered (stream, ", ");
139 print_type_scalar (target, i, stream);
140 empty_set = 0;
141 element_seen = 1;
142 previous_low = i;
143 }
144 }
145 else
146 {
147 /* bit is not set */
148 if (element_seen)
149 {
150 if (previous_low+1 < previous_high)
151 fprintf_filtered (stream, "..");
152 if (previous_low+1 < previous_high)
153 print_type_scalar (target, previous_high, stream);
154 element_seen = 0;
155 }
156 }
157 if (i == field_high)
158 {
159 field++;
160 if (field == len)
161 break;
162 range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
163 if (get_discrete_bounds (range, &field_low, &field_high) < 0)
164 break;
165 target = TYPE_TARGET_TYPE (range);
166 }
167 }
168 if (element_seen)
169 {
170 if (previous_low+1 < previous_high)
171 {
172 fprintf_filtered (stream, "..");
173 print_type_scalar (target, previous_high, stream);
174 }
175 element_seen = 0;
176 }
177 fprintf_filtered (stream, "}");
178 }
179 }
180
181 static void
m2_print_unbounded_array(struct type * type,const gdb_byte * valaddr,int embedded_offset,CORE_ADDR address,struct ui_file * stream,int recurse,const struct value_print_options * options)182 m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
183 int embedded_offset, CORE_ADDR address,
184 struct ui_file *stream, int recurse,
185 const struct value_print_options *options)
186 {
187 struct type *content_type;
188 CORE_ADDR addr;
189 LONGEST len;
190 struct value *val;
191
192 CHECK_TYPEDEF (type);
193 content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
194
195 addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
196 (TYPE_FIELD_BITPOS (type, 0) / 8) +
197 valaddr + embedded_offset);
198
199 val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
200 addr);
201 len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
202
203 fprintf_filtered (stream, "{");
204 m2_print_array_contents (value_type (val),
205 value_contents_for_printing (val),
206 value_embedded_offset (val), addr, stream,
207 recurse, val, options, len);
208 fprintf_filtered (stream, ", HIGH = %d}", (int) len);
209 }
210
211 static int
print_unpacked_pointer(struct type * type,CORE_ADDR address,CORE_ADDR addr,const struct value_print_options * options,struct ui_file * stream)212 print_unpacked_pointer (struct type *type,
213 CORE_ADDR address, CORE_ADDR addr,
214 const struct value_print_options *options,
215 struct ui_file *stream)
216 {
217 struct gdbarch *gdbarch = get_type_arch (type);
218 struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
219
220 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
221 {
222 /* Try to print what function it points to. */
223 print_function_pointer_address (gdbarch, addr, stream,
224 options->addressprint);
225 /* Return value is irrelevant except for string pointers. */
226 return 0;
227 }
228
229 if (options->addressprint && options->format != 's')
230 fputs_filtered (paddress (gdbarch, address), stream);
231
232 /* For a pointer to char or unsigned char, also print the string
233 pointed to, unless pointer is null. */
234
235 if (TYPE_LENGTH (elttype) == 1
236 && TYPE_CODE (elttype) == TYPE_CODE_INT
237 && (options->format == 0 || options->format == 's')
238 && addr != 0)
239 return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
240 stream, options);
241
242 return 0;
243 }
244
245 static void
print_variable_at_address(struct type * type,const gdb_byte * valaddr,struct ui_file * stream,int recurse,const struct value_print_options * options)246 print_variable_at_address (struct type *type,
247 const gdb_byte *valaddr,
248 struct ui_file *stream,
249 int recurse,
250 const struct value_print_options *options)
251 {
252 struct gdbarch *gdbarch = get_type_arch (type);
253 CORE_ADDR addr = unpack_pointer (type, valaddr);
254 struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
255
256 fprintf_filtered (stream, "[");
257 fputs_filtered (paddress (gdbarch, addr), stream);
258 fprintf_filtered (stream, "] : ");
259
260 if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
261 {
262 struct value *deref_val =
263 value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
264
265 common_val_print (deref_val, stream, recurse, options, current_language);
266 }
267 else
268 fputs_filtered ("???", stream);
269 }
270
271
272 /* m2_print_array_contents - prints out the contents of an
273 array up to a max_print values.
274 It prints arrays of char as a string
275 and all other data types as comma
276 separated values. */
277
278 static void
m2_print_array_contents(struct type * type,const gdb_byte * valaddr,int embedded_offset,CORE_ADDR address,struct ui_file * stream,int recurse,const struct value * val,const struct value_print_options * options,int len)279 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
280 int embedded_offset, CORE_ADDR address,
281 struct ui_file *stream, int recurse,
282 const struct value *val,
283 const struct value_print_options *options,
284 int len)
285 {
286 int eltlen;
287 CHECK_TYPEDEF (type);
288
289 if (TYPE_LENGTH (type) > 0)
290 {
291 eltlen = TYPE_LENGTH (type);
292 if (options->prettyprint_arrays)
293 print_spaces_filtered (2 + 2 * recurse, stream);
294 /* For an array of chars, print with string syntax. */
295 if (eltlen == 1 &&
296 ((TYPE_CODE (type) == TYPE_CODE_INT)
297 || ((current_language->la_language == language_m2)
298 && (TYPE_CODE (type) == TYPE_CODE_CHAR)))
299 && (options->format == 0 || options->format == 's'))
300 val_print_string (type, NULL, address, len+1, stream, options);
301 else
302 {
303 fprintf_filtered (stream, "{");
304 val_print_array_elements (type, valaddr, embedded_offset,
305 address, stream, recurse, val,
306 options, 0);
307 fprintf_filtered (stream, "}");
308 }
309 }
310 }
311
312
313 /* See val_print for a description of the various parameters of this
314 function; they are identical. The semantics of the return value is
315 also identical to val_print. */
316
317 int
m2_val_print(struct type * type,const gdb_byte * valaddr,int embedded_offset,CORE_ADDR address,struct ui_file * stream,int recurse,const struct value * original_value,const struct value_print_options * options)318 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
319 CORE_ADDR address, struct ui_file *stream, int recurse,
320 const struct value *original_value,
321 const struct value_print_options *options)
322 {
323 struct gdbarch *gdbarch = get_type_arch (type);
324 unsigned int i = 0; /* Number of characters printed. */
325 unsigned len;
326 struct type *elttype;
327 unsigned eltlen;
328 LONGEST val;
329 CORE_ADDR addr;
330
331 CHECK_TYPEDEF (type);
332 switch (TYPE_CODE (type))
333 {
334 case TYPE_CODE_ARRAY:
335 if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
336 {
337 elttype = check_typedef (TYPE_TARGET_TYPE (type));
338 eltlen = TYPE_LENGTH (elttype);
339 len = TYPE_LENGTH (type) / eltlen;
340 if (options->prettyprint_arrays)
341 print_spaces_filtered (2 + 2 * recurse, stream);
342 /* For an array of chars, print with string syntax. */
343 if (eltlen == 1 &&
344 ((TYPE_CODE (elttype) == TYPE_CODE_INT)
345 || ((current_language->la_language == language_m2)
346 && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
347 && (options->format == 0 || options->format == 's'))
348 {
349 /* If requested, look for the first null char and only print
350 elements up to it. */
351 if (options->stop_print_at_null)
352 {
353 unsigned int temp_len;
354
355 /* Look for a NULL char. */
356 for (temp_len = 0;
357 (valaddr + embedded_offset)[temp_len]
358 && temp_len < len && temp_len < options->print_max;
359 temp_len++);
360 len = temp_len;
361 }
362
363 LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
364 valaddr + embedded_offset, len, NULL,
365 0, options);
366 i = len;
367 }
368 else
369 {
370 fprintf_filtered (stream, "{");
371 val_print_array_elements (type, valaddr, embedded_offset,
372 address, stream,
373 recurse, original_value,
374 options, 0);
375 fprintf_filtered (stream, "}");
376 }
377 break;
378 }
379 /* Array of unspecified length: treat like pointer to first elt. */
380 print_unpacked_pointer (type, address, address, options, stream);
381 break;
382
383 case TYPE_CODE_PTR:
384 if (TYPE_CONST (type))
385 print_variable_at_address (type, valaddr + embedded_offset,
386 stream, recurse, options);
387 else if (options->format && options->format != 's')
388 val_print_scalar_formatted (type, valaddr, embedded_offset,
389 original_value, options, 0, stream);
390 else
391 {
392 addr = unpack_pointer (type, valaddr + embedded_offset);
393 print_unpacked_pointer (type, addr, address, options, stream);
394 }
395 break;
396
397 case TYPE_CODE_REF:
398 elttype = check_typedef (TYPE_TARGET_TYPE (type));
399 if (options->addressprint)
400 {
401 CORE_ADDR addr
402 = extract_typed_address (valaddr + embedded_offset, type);
403
404 fprintf_filtered (stream, "@");
405 fputs_filtered (paddress (gdbarch, addr), stream);
406 if (options->deref_ref)
407 fputs_filtered (": ", stream);
408 }
409 /* De-reference the reference. */
410 if (options->deref_ref)
411 {
412 if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
413 {
414 struct value *deref_val =
415 value_at
416 (TYPE_TARGET_TYPE (type),
417 unpack_pointer (type, valaddr + embedded_offset));
418
419 common_val_print (deref_val, stream, recurse, options,
420 current_language);
421 }
422 else
423 fputs_filtered ("???", stream);
424 }
425 break;
426
427 case TYPE_CODE_UNION:
428 if (recurse && !options->unionprint)
429 {
430 fprintf_filtered (stream, "{...}");
431 break;
432 }
433 /* Fall through. */
434 case TYPE_CODE_STRUCT:
435 if (m2_is_long_set (type))
436 m2_print_long_set (type, valaddr, embedded_offset, address,
437 stream);
438 else if (m2_is_unbounded_array (type))
439 m2_print_unbounded_array (type, valaddr, embedded_offset,
440 address, stream, recurse, options);
441 else
442 cp_print_value_fields (type, type, valaddr, embedded_offset,
443 address, stream, recurse, original_value,
444 options, NULL, 0);
445 break;
446
447 case TYPE_CODE_ENUM:
448 if (options->format)
449 {
450 val_print_scalar_formatted (type, valaddr, embedded_offset,
451 original_value, options, 0, stream);
452 break;
453 }
454 len = TYPE_NFIELDS (type);
455 val = unpack_long (type, valaddr + embedded_offset);
456 for (i = 0; i < len; i++)
457 {
458 QUIT;
459 if (val == TYPE_FIELD_BITPOS (type, i))
460 {
461 break;
462 }
463 }
464 if (i < len)
465 {
466 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
467 }
468 else
469 {
470 print_longest (stream, 'd', 0, val);
471 }
472 break;
473
474 case TYPE_CODE_FUNC:
475 if (options->format)
476 {
477 val_print_scalar_formatted (type, valaddr, embedded_offset,
478 original_value, options, 0, stream);
479 break;
480 }
481 /* FIXME, we should consider, at least for ANSI C language, eliminating
482 the distinction made between FUNCs and POINTERs to FUNCs. */
483 fprintf_filtered (stream, "{");
484 type_print (type, "", stream, -1);
485 fprintf_filtered (stream, "} ");
486 /* Try to print what function it points to, and its address. */
487 print_address_demangle (gdbarch, address, stream, demangle);
488 break;
489
490 case TYPE_CODE_BOOL:
491 if (options->format || options->output_format)
492 {
493 struct value_print_options opts = *options;
494
495 opts.format = (options->format ? options->format
496 : options->output_format);
497 val_print_scalar_formatted (type, valaddr, embedded_offset,
498 original_value, &opts, 0, stream);
499 }
500 else
501 {
502 val = unpack_long (type, valaddr + embedded_offset);
503 if (val == 0)
504 fputs_filtered ("FALSE", stream);
505 else if (val == 1)
506 fputs_filtered ("TRUE", stream);
507 else
508 fprintf_filtered (stream, "%ld)", (long int) val);
509 }
510 break;
511
512 case TYPE_CODE_RANGE:
513 if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
514 {
515 m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
516 address, stream, recurse, original_value, options);
517 break;
518 }
519 /* FIXME: create_range_type does not set the unsigned bit in a
520 range type (I think it probably should copy it from the target
521 type), so we won't print values which are too large to
522 fit in a signed integer correctly. */
523 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
524 print with the target type, though, because the size of our type
525 and the target type might differ). */
526 /* FALLTHROUGH */
527
528 case TYPE_CODE_INT:
529 if (options->format || options->output_format)
530 {
531 struct value_print_options opts = *options;
532
533 opts.format = (options->format ? options->format
534 : options->output_format);
535 val_print_scalar_formatted (type, valaddr, embedded_offset,
536 original_value, &opts, 0, stream);
537 }
538 else
539 val_print_type_code_int (type, valaddr + embedded_offset, stream);
540 break;
541
542 case TYPE_CODE_CHAR:
543 if (options->format || options->output_format)
544 {
545 struct value_print_options opts = *options;
546
547 opts.format = (options->format ? options->format
548 : options->output_format);
549 val_print_scalar_formatted (type, valaddr, embedded_offset,
550 original_value, &opts, 0, stream);
551 }
552 else
553 {
554 val = unpack_long (type, valaddr + embedded_offset);
555 if (TYPE_UNSIGNED (type))
556 fprintf_filtered (stream, "%u", (unsigned int) val);
557 else
558 fprintf_filtered (stream, "%d", (int) val);
559 fputs_filtered (" ", stream);
560 LA_PRINT_CHAR ((unsigned char) val, type, stream);
561 }
562 break;
563
564 case TYPE_CODE_FLT:
565 if (options->format)
566 val_print_scalar_formatted (type, valaddr, embedded_offset,
567 original_value, options, 0, stream);
568 else
569 print_floating (valaddr + embedded_offset, type, stream);
570 break;
571
572 case TYPE_CODE_METHOD:
573 break;
574
575 case TYPE_CODE_BITSTRING:
576 case TYPE_CODE_SET:
577 elttype = TYPE_INDEX_TYPE (type);
578 CHECK_TYPEDEF (elttype);
579 if (TYPE_STUB (elttype))
580 {
581 fprintf_filtered (stream, _("<incomplete type>"));
582 gdb_flush (stream);
583 break;
584 }
585 else
586 {
587 struct type *range = elttype;
588 LONGEST low_bound, high_bound;
589 int i;
590 int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
591 int need_comma = 0;
592
593 if (is_bitstring)
594 fputs_filtered ("B'", stream);
595 else
596 fputs_filtered ("{", stream);
597
598 i = get_discrete_bounds (range, &low_bound, &high_bound);
599 maybe_bad_bstring:
600 if (i < 0)
601 {
602 fputs_filtered (_("<error value>"), stream);
603 goto done;
604 }
605
606 for (i = low_bound; i <= high_bound; i++)
607 {
608 int element = value_bit_index (type, valaddr + embedded_offset,
609 i);
610
611 if (element < 0)
612 {
613 i = element;
614 goto maybe_bad_bstring;
615 }
616 if (is_bitstring)
617 fprintf_filtered (stream, "%d", element);
618 else if (element)
619 {
620 if (need_comma)
621 fputs_filtered (", ", stream);
622 print_type_scalar (range, i, stream);
623 need_comma = 1;
624
625 if (i + 1 <= high_bound
626 && value_bit_index (type, valaddr + embedded_offset,
627 ++i))
628 {
629 int j = i;
630
631 fputs_filtered ("..", stream);
632 while (i + 1 <= high_bound
633 && value_bit_index (type,
634 valaddr + embedded_offset,
635 ++i))
636 j = i;
637 print_type_scalar (range, j, stream);
638 }
639 }
640 }
641 done:
642 if (is_bitstring)
643 fputs_filtered ("'", stream);
644 else
645 fputs_filtered ("}", stream);
646 }
647 break;
648
649 case TYPE_CODE_VOID:
650 fprintf_filtered (stream, "void");
651 break;
652
653 case TYPE_CODE_ERROR:
654 fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
655 break;
656
657 case TYPE_CODE_UNDEF:
658 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
659 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
660 and no complete type for struct foo in that file. */
661 fprintf_filtered (stream, _("<incomplete type>"));
662 break;
663
664 default:
665 error (_("Invalid m2 type code %d in symbol table."), TYPE_CODE (type));
666 }
667 gdb_flush (stream);
668 return (0);
669 }
670