1 /* Support for printing Java values for GDB, the GNU debugger.
2
3 Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
4 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 2 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, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
22
23 #include "defs.h"
24 #include "symtab.h"
25 #include "gdbtypes.h"
26 #include "gdbcore.h"
27 #include "expression.h"
28 #include "value.h"
29 #include "demangle.h"
30 #include "valprint.h"
31 #include "language.h"
32 #include "jv-lang.h"
33 #include "c-lang.h"
34 #include "annotate.h"
35 #include "gdb_string.h"
36
37 /* Local functions */
38
39 static void java_print_value_fields (struct type * type, char *valaddr,
40 CORE_ADDR address,
41 struct ui_file *stream, int format,
42 int recurse,
43 enum val_prettyprint pretty);
44
45
46 int
java_value_print(struct value * val,struct ui_file * stream,int format,enum val_prettyprint pretty)47 java_value_print (struct value *val, struct ui_file *stream, int format,
48 enum val_prettyprint pretty)
49 {
50 struct type *type;
51 CORE_ADDR address;
52 int i;
53 char *name;
54
55 type = VALUE_TYPE (val);
56 address = VALUE_ADDRESS (val) + VALUE_OFFSET (val);
57
58 if (is_object_type (type))
59 {
60 CORE_ADDR obj_addr;
61
62 /* Get the run-time type, and cast the object into that */
63
64 obj_addr = unpack_pointer (type, VALUE_CONTENTS (val));
65
66 if (obj_addr != 0)
67 {
68 type = type_from_class (java_class_from_object (val));
69 type = lookup_pointer_type (type);
70
71 val = value_at (type, address, NULL);
72 }
73 }
74
75 if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val))
76 type_print (TYPE_TARGET_TYPE (type), "", stream, -1);
77
78 name = TYPE_TAG_NAME (type);
79 if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL
80 && (i = strlen (name), name[i - 1] == ']'))
81 {
82 char buf4[4];
83 long length;
84 unsigned int things_printed = 0;
85 int reps;
86 struct type *el_type = java_primitive_type_from_name (name, i - 2);
87
88 i = 0;
89 read_memory (address + JAVA_OBJECT_SIZE, buf4, 4);
90
91 length = (long) extract_signed_integer (buf4, 4);
92 fprintf_filtered (stream, "{length: %ld", length);
93
94 if (el_type == NULL)
95 {
96 CORE_ADDR element;
97 CORE_ADDR next_element = -1; /* dummy initial value */
98
99 address += JAVA_OBJECT_SIZE + 4; /* Skip object header and length. */
100
101 while (i < length && things_printed < print_max)
102 {
103 char *buf;
104
105 buf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT);
106 fputs_filtered (", ", stream);
107 wrap_here (n_spaces (2));
108
109 if (i > 0)
110 element = next_element;
111 else
112 {
113 read_memory (address, buf, sizeof (buf));
114 address += TARGET_PTR_BIT / HOST_CHAR_BIT;
115 /* FIXME: cagney/2003-05-24: Bogus or what. It
116 pulls a host sized pointer out of the target and
117 then extracts that as an address (while assuming
118 that the address is unsigned)! */
119 element = extract_unsigned_integer (buf, sizeof (buf));
120 }
121
122 for (reps = 1; i + reps < length; reps++)
123 {
124 read_memory (address, buf, sizeof (buf));
125 address += TARGET_PTR_BIT / HOST_CHAR_BIT;
126 /* FIXME: cagney/2003-05-24: Bogus or what. It
127 pulls a host sized pointer out of the target and
128 then extracts that as an address (while assuming
129 that the address is unsigned)! */
130 next_element = extract_unsigned_integer (buf, sizeof (buf));
131 if (next_element != element)
132 break;
133 }
134
135 if (reps == 1)
136 fprintf_filtered (stream, "%d: ", i);
137 else
138 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
139
140 if (element == 0)
141 fprintf_filtered (stream, "null");
142 else
143 fprintf_filtered (stream, "@%s", paddr_nz (element));
144
145 things_printed++;
146 i += reps;
147 }
148 }
149 else
150 {
151 struct value *v = allocate_value (el_type);
152 struct value *next_v = allocate_value (el_type);
153
154 VALUE_ADDRESS (v) = address + JAVA_OBJECT_SIZE + 4;
155 VALUE_ADDRESS (next_v) = VALUE_ADDRESS (v);
156
157 while (i < length && things_printed < print_max)
158 {
159 fputs_filtered (", ", stream);
160 wrap_here (n_spaces (2));
161
162 if (i > 0)
163 {
164 struct value *tmp;
165
166 tmp = next_v;
167 next_v = v;
168 v = tmp;
169 }
170 else
171 {
172 VALUE_LAZY (v) = 1;
173 VALUE_OFFSET (v) = 0;
174 }
175
176 VALUE_OFFSET (next_v) = VALUE_OFFSET (v);
177
178 for (reps = 1; i + reps < length; reps++)
179 {
180 VALUE_LAZY (next_v) = 1;
181 VALUE_OFFSET (next_v) += TYPE_LENGTH (el_type);
182 if (memcmp (VALUE_CONTENTS (v), VALUE_CONTENTS (next_v),
183 TYPE_LENGTH (el_type)) != 0)
184 break;
185 }
186
187 if (reps == 1)
188 fprintf_filtered (stream, "%d: ", i);
189 else
190 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
191
192 common_val_print (v, stream, format, 2, 1, pretty);
193
194 things_printed++;
195 i += reps;
196 }
197 }
198
199 if (i < length)
200 fprintf_filtered (stream, "...");
201
202 fprintf_filtered (stream, "}");
203
204 return 0;
205 }
206
207 /* If it's type String, print it */
208
209 if (TYPE_CODE (type) == TYPE_CODE_PTR
210 && TYPE_TARGET_TYPE (type)
211 && TYPE_TAG_NAME (TYPE_TARGET_TYPE (type))
212 && strcmp (TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)),
213 "java.lang.String") == 0
214 && (format == 0 || format == 's')
215 && address != 0
216 && value_as_address (val) != 0)
217 {
218 struct value *data_val;
219 CORE_ADDR data;
220 struct value *boffset_val;
221 unsigned long boffset;
222 struct value *count_val;
223 unsigned long count;
224 struct value *mark;
225
226 mark = value_mark (); /* Remember start of new values */
227
228 data_val = value_struct_elt (&val, NULL, "data", NULL, NULL);
229 data = value_as_address (data_val);
230
231 boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL);
232 boffset = value_as_address (boffset_val);
233
234 count_val = value_struct_elt (&val, NULL, "count", NULL, NULL);
235 count = value_as_address (count_val);
236
237 value_free_to_mark (mark); /* Release unnecessary values */
238
239 val_print_string (data + boffset, count, 2, stream);
240
241 return 0;
242 }
243
244 return common_val_print (val, stream, format, 1, 0, pretty);
245 }
246
247 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
248 same meanings as in cp_print_value and c_val_print.
249
250 DONT_PRINT is an array of baseclass types that we
251 should not print, or zero if called from top level. */
252
253 static void
java_print_value_fields(struct type * type,char * valaddr,CORE_ADDR address,struct ui_file * stream,int format,int recurse,enum val_prettyprint pretty)254 java_print_value_fields (struct type *type, char *valaddr, CORE_ADDR address,
255 struct ui_file *stream, int format, int recurse,
256 enum val_prettyprint pretty)
257 {
258 int i, len, n_baseclasses;
259
260 CHECK_TYPEDEF (type);
261
262 fprintf_filtered (stream, "{");
263 len = TYPE_NFIELDS (type);
264 n_baseclasses = TYPE_N_BASECLASSES (type);
265
266 if (n_baseclasses > 0)
267 {
268 int i, n_baseclasses = TYPE_N_BASECLASSES (type);
269
270 for (i = 0; i < n_baseclasses; i++)
271 {
272 int boffset;
273 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
274 char *basename = TYPE_NAME (baseclass);
275 char *base_valaddr;
276
277 if (BASETYPE_VIA_VIRTUAL (type, i))
278 continue;
279
280 if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
281 continue;
282
283 boffset = 0;
284
285 if (pretty)
286 {
287 fprintf_filtered (stream, "\n");
288 print_spaces_filtered (2 * (recurse + 1), stream);
289 }
290 fputs_filtered ("<", stream);
291 /* Not sure what the best notation is in the case where there is no
292 baseclass name. */
293 fputs_filtered (basename ? basename : "", stream);
294 fputs_filtered ("> = ", stream);
295
296 base_valaddr = valaddr;
297
298 java_print_value_fields (baseclass, base_valaddr, address + boffset,
299 stream, format, recurse + 1, pretty);
300 fputs_filtered (", ", stream);
301 }
302
303 }
304
305 if (!len && n_baseclasses == 1)
306 fprintf_filtered (stream, "<No data fields>");
307 else
308 {
309 int fields_seen = 0;
310
311 for (i = n_baseclasses; i < len; i++)
312 {
313 /* If requested, skip printing of static fields. */
314 if (TYPE_FIELD_STATIC (type, i))
315 {
316 char *name = TYPE_FIELD_NAME (type, i);
317 if (!static_field_print)
318 continue;
319 if (name != NULL && strcmp (name, "class") == 0)
320 continue;
321 }
322 if (fields_seen)
323 fprintf_filtered (stream, ", ");
324 else if (n_baseclasses > 0)
325 {
326 if (pretty)
327 {
328 fprintf_filtered (stream, "\n");
329 print_spaces_filtered (2 + 2 * recurse, stream);
330 fputs_filtered ("members of ", stream);
331 fputs_filtered (type_name_no_tag (type), stream);
332 fputs_filtered (": ", stream);
333 }
334 }
335 fields_seen = 1;
336
337 if (pretty)
338 {
339 fprintf_filtered (stream, "\n");
340 print_spaces_filtered (2 + 2 * recurse, stream);
341 }
342 else
343 {
344 wrap_here (n_spaces (2 + 2 * recurse));
345 }
346 if (inspect_it)
347 {
348 if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
349 fputs_filtered ("\"( ptr \"", stream);
350 else
351 fputs_filtered ("\"( nodef \"", stream);
352 if (TYPE_FIELD_STATIC (type, i))
353 fputs_filtered ("static ", stream);
354 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
355 language_cplus,
356 DMGL_PARAMS | DMGL_ANSI);
357 fputs_filtered ("\" \"", stream);
358 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
359 language_cplus,
360 DMGL_PARAMS | DMGL_ANSI);
361 fputs_filtered ("\") \"", stream);
362 }
363 else
364 {
365 annotate_field_begin (TYPE_FIELD_TYPE (type, i));
366
367 if (TYPE_FIELD_STATIC (type, i))
368 fputs_filtered ("static ", stream);
369 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
370 language_cplus,
371 DMGL_PARAMS | DMGL_ANSI);
372 annotate_field_name_end ();
373 fputs_filtered (": ", stream);
374 annotate_field_value ();
375 }
376
377 if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
378 {
379 struct value *v;
380
381 /* Bitfields require special handling, especially due to byte
382 order problems. */
383 if (TYPE_FIELD_IGNORE (type, i))
384 {
385 fputs_filtered ("<optimized out or zero length>", stream);
386 }
387 else
388 {
389 v = value_from_longest (TYPE_FIELD_TYPE (type, i),
390 unpack_field_as_long (type, valaddr, i));
391
392 common_val_print (v, stream, format, 0, recurse + 1, pretty);
393 }
394 }
395 else
396 {
397 if (TYPE_FIELD_IGNORE (type, i))
398 {
399 fputs_filtered ("<optimized out or zero length>", stream);
400 }
401 else if (TYPE_FIELD_STATIC (type, i))
402 {
403 struct value *v = value_static_field (type, i);
404 if (v == NULL)
405 fputs_filtered ("<optimized out>", stream);
406 else
407 {
408 struct type *t = check_typedef (VALUE_TYPE (v));
409 if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
410 v = value_addr (v);
411 common_val_print (v, stream, format, 0, recurse + 1,
412 pretty);
413 }
414 }
415 else if (TYPE_FIELD_TYPE (type, i) == NULL)
416 fputs_filtered ("<unknown type>", stream);
417 else
418 {
419 val_print (TYPE_FIELD_TYPE (type, i),
420 valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0,
421 address + TYPE_FIELD_BITPOS (type, i) / 8,
422 stream, format, 0, recurse + 1, pretty);
423 }
424 }
425 annotate_field_end ();
426 }
427
428 if (pretty)
429 {
430 fprintf_filtered (stream, "\n");
431 print_spaces_filtered (2 * recurse, stream);
432 }
433 }
434 fprintf_filtered (stream, "}");
435 }
436
437 /* Print data of type TYPE located at VALADDR (within GDB), which came from
438 the inferior at address ADDRESS, onto stdio stream STREAM according to
439 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
440 target byte order.
441
442 If the data are a string pointer, returns the number of string characters
443 printed.
444
445 If DEREF_REF is nonzero, then dereference references, otherwise just print
446 them like pointers.
447
448 The PRETTY parameter controls prettyprinting. */
449
450 int
java_val_print(struct type * type,char * valaddr,int embedded_offset,CORE_ADDR address,struct ui_file * stream,int format,int deref_ref,int recurse,enum val_prettyprint pretty)451 java_val_print (struct type *type, char *valaddr, int embedded_offset,
452 CORE_ADDR address, struct ui_file *stream, int format,
453 int deref_ref, int recurse, enum val_prettyprint pretty)
454 {
455 unsigned int i = 0; /* Number of characters printed */
456 struct type *target_type;
457 CORE_ADDR addr;
458
459 CHECK_TYPEDEF (type);
460 switch (TYPE_CODE (type))
461 {
462 case TYPE_CODE_PTR:
463 if (format && format != 's')
464 {
465 print_scalar_formatted (valaddr, type, format, 0, stream);
466 break;
467 }
468 #if 0
469 if (vtblprint && cp_is_vtbl_ptr_type (type))
470 {
471 /* Print the unmangled name if desired. */
472 /* Print vtable entry - we only get here if we ARE using
473 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
474 /* Extract an address, assume that it is unsigned. */
475 print_address_demangle (extract_unsigned_integer (valaddr, TYPE_LENGTH (type)),
476 stream, demangle);
477 break;
478 }
479 #endif
480 addr = unpack_pointer (type, valaddr);
481 if (addr == 0)
482 {
483 fputs_filtered ("null", stream);
484 return i;
485 }
486 target_type = check_typedef (TYPE_TARGET_TYPE (type));
487
488 if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)
489 {
490 /* Try to print what function it points to. */
491 print_address_demangle (addr, stream, demangle);
492 /* Return value is irrelevant except for string pointers. */
493 return (0);
494 }
495
496 if (addressprint && format != 's')
497 {
498 fputs_filtered ("@", stream);
499 print_longest (stream, 'x', 0, (ULONGEST) addr);
500 }
501
502 return i;
503
504 case TYPE_CODE_CHAR:
505 case TYPE_CODE_INT:
506 /* Can't just call c_val_print because that prints bytes as C
507 chars. */
508 format = format ? format : output_format;
509 if (format)
510 print_scalar_formatted (valaddr, type, format, 0, stream);
511 else if (TYPE_CODE (type) == TYPE_CODE_CHAR
512 || (TYPE_CODE (type) == TYPE_CODE_INT
513 && TYPE_LENGTH (type) == 2
514 && strcmp (TYPE_NAME (type), "char") == 0))
515 LA_PRINT_CHAR ((int) unpack_long (type, valaddr), stream);
516 else
517 val_print_type_code_int (type, valaddr, stream);
518 break;
519
520 case TYPE_CODE_STRUCT:
521 java_print_value_fields (type, valaddr, address, stream, format,
522 recurse, pretty);
523 break;
524
525 default:
526 return c_val_print (type, valaddr, embedded_offset, address, stream,
527 format, deref_ref, recurse, pretty);
528 }
529
530 return 0;
531 }
532