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1 | /* Objective-C language support routines for GDB, the GNU debugger. | |
2 | ||
3 | Copyright (C) 2002-2019 Free Software Foundation, Inc. | |
4 | ||
5 | Contributed by Apple Computer, Inc. | |
6 | Written by Michael Snyder. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 3 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "symtab.h" | |
25 | #include "gdbtypes.h" | |
26 | #include "expression.h" | |
27 | #include "parser-defs.h" | |
28 | #include "language.h" | |
29 | #include "varobj.h" | |
30 | #include "c-lang.h" | |
31 | #include "objc-lang.h" | |
32 | #include "complaints.h" | |
33 | #include "value.h" | |
34 | #include "symfile.h" | |
35 | #include "objfiles.h" | |
36 | #include "target.h" /* for target_has_execution */ | |
37 | #include "gdbcore.h" | |
38 | #include "gdbcmd.h" | |
39 | #include "frame.h" | |
40 | #include "gdb_regex.h" | |
41 | #include "regcache.h" | |
42 | #include "block.h" | |
43 | #include "infcall.h" | |
44 | #include "valprint.h" | |
45 | #include "cli/cli-utils.h" | |
46 | ||
47 | #include <ctype.h> | |
48 | #include <algorithm> | |
49 | ||
50 | struct objc_object { | |
51 | CORE_ADDR isa; | |
52 | }; | |
53 | ||
54 | struct objc_class { | |
55 | CORE_ADDR isa; | |
56 | CORE_ADDR super_class; | |
57 | CORE_ADDR name; | |
58 | long version; | |
59 | long info; | |
60 | long instance_size; | |
61 | CORE_ADDR ivars; | |
62 | CORE_ADDR methods; | |
63 | CORE_ADDR cache; | |
64 | CORE_ADDR protocols; | |
65 | }; | |
66 | ||
67 | struct objc_super { | |
68 | CORE_ADDR receiver; | |
69 | CORE_ADDR theclass; | |
70 | }; | |
71 | ||
72 | struct objc_method { | |
73 | CORE_ADDR name; | |
74 | CORE_ADDR types; | |
75 | CORE_ADDR imp; | |
76 | }; | |
77 | ||
78 | static const struct objfile_key<unsigned int> objc_objfile_data; | |
79 | ||
80 | /* Lookup a structure type named "struct NAME", visible in lexical | |
81 | block BLOCK. If NOERR is nonzero, return zero if NAME is not | |
82 | suitably defined. */ | |
83 | ||
84 | struct symbol * | |
85 | lookup_struct_typedef (const char *name, const struct block *block, int noerr) | |
86 | { | |
87 | struct symbol *sym; | |
88 | ||
89 | sym = lookup_symbol (name, block, STRUCT_DOMAIN, 0).symbol; | |
90 | ||
91 | if (sym == NULL) | |
92 | { | |
93 | if (noerr) | |
94 | return 0; | |
95 | else | |
96 | error (_("No struct type named %s."), name); | |
97 | } | |
98 | if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_STRUCT) | |
99 | { | |
100 | if (noerr) | |
101 | return 0; | |
102 | else | |
103 | error (_("This context has class, union or enum %s, not a struct."), | |
104 | name); | |
105 | } | |
106 | return sym; | |
107 | } | |
108 | ||
109 | CORE_ADDR | |
110 | lookup_objc_class (struct gdbarch *gdbarch, const char *classname) | |
111 | { | |
112 | struct type *char_type = builtin_type (gdbarch)->builtin_char; | |
113 | struct value * function, *classval; | |
114 | ||
115 | if (! target_has_execution) | |
116 | { | |
117 | /* Can't call into inferior to lookup class. */ | |
118 | return 0; | |
119 | } | |
120 | ||
121 | if (lookup_minimal_symbol("objc_lookUpClass", 0, 0).minsym) | |
122 | function = find_function_in_inferior("objc_lookUpClass", NULL); | |
123 | else if (lookup_minimal_symbol ("objc_lookup_class", 0, 0).minsym) | |
124 | function = find_function_in_inferior("objc_lookup_class", NULL); | |
125 | else | |
126 | { | |
127 | complaint (_("no way to lookup Objective-C classes")); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | classval = value_string (classname, strlen (classname) + 1, char_type); | |
132 | classval = value_coerce_array (classval); | |
133 | return (CORE_ADDR) value_as_long (call_function_by_hand (function, | |
134 | NULL, | |
135 | classval)); | |
136 | } | |
137 | ||
138 | CORE_ADDR | |
139 | lookup_child_selector (struct gdbarch *gdbarch, const char *selname) | |
140 | { | |
141 | struct type *char_type = builtin_type (gdbarch)->builtin_char; | |
142 | struct value * function, *selstring; | |
143 | ||
144 | if (! target_has_execution) | |
145 | { | |
146 | /* Can't call into inferior to lookup selector. */ | |
147 | return 0; | |
148 | } | |
149 | ||
150 | if (lookup_minimal_symbol("sel_getUid", 0, 0).minsym) | |
151 | function = find_function_in_inferior("sel_getUid", NULL); | |
152 | else if (lookup_minimal_symbol ("sel_get_any_uid", 0, 0).minsym) | |
153 | function = find_function_in_inferior("sel_get_any_uid", NULL); | |
154 | else | |
155 | { | |
156 | complaint (_("no way to lookup Objective-C selectors")); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | selstring = value_coerce_array (value_string (selname, | |
161 | strlen (selname) + 1, | |
162 | char_type)); | |
163 | return value_as_long (call_function_by_hand (function, NULL, selstring)); | |
164 | } | |
165 | ||
166 | struct value * | |
167 | value_nsstring (struct gdbarch *gdbarch, char *ptr, int len) | |
168 | { | |
169 | struct type *char_type = builtin_type (gdbarch)->builtin_char; | |
170 | struct value *stringValue[3]; | |
171 | struct value *function, *nsstringValue; | |
172 | struct symbol *sym; | |
173 | struct type *type; | |
174 | ||
175 | if (!target_has_execution) | |
176 | return 0; /* Can't call into inferior to create NSString. */ | |
177 | ||
178 | stringValue[2] = value_string(ptr, len, char_type); | |
179 | stringValue[2] = value_coerce_array(stringValue[2]); | |
180 | /* _NSNewStringFromCString replaces "istr" after Lantern2A. */ | |
181 | if (lookup_minimal_symbol("_NSNewStringFromCString", 0, 0).minsym) | |
182 | { | |
183 | function = find_function_in_inferior("_NSNewStringFromCString", NULL); | |
184 | nsstringValue = call_function_by_hand(function, NULL, stringValue[2]); | |
185 | } | |
186 | else if (lookup_minimal_symbol("istr", 0, 0).minsym) | |
187 | { | |
188 | function = find_function_in_inferior("istr", NULL); | |
189 | nsstringValue = call_function_by_hand(function, NULL, stringValue[2]); | |
190 | } | |
191 | else if (lookup_minimal_symbol("+[NSString stringWithCString:]", 0, 0).minsym) | |
192 | { | |
193 | function | |
194 | = find_function_in_inferior("+[NSString stringWithCString:]", NULL); | |
195 | type = builtin_type (gdbarch)->builtin_long; | |
196 | ||
197 | stringValue[0] = value_from_longest | |
198 | (type, lookup_objc_class (gdbarch, "NSString")); | |
199 | stringValue[1] = value_from_longest | |
200 | (type, lookup_child_selector (gdbarch, "stringWithCString:")); | |
201 | nsstringValue = call_function_by_hand(function, NULL, stringValue); | |
202 | } | |
203 | else | |
204 | error (_("NSString: internal error -- no way to create new NSString")); | |
205 | ||
206 | sym = lookup_struct_typedef("NSString", 0, 1); | |
207 | if (sym == NULL) | |
208 | sym = lookup_struct_typedef("NXString", 0, 1); | |
209 | if (sym == NULL) | |
210 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
211 | else | |
212 | type = lookup_pointer_type(SYMBOL_TYPE (sym)); | |
213 | ||
214 | deprecated_set_value_type (nsstringValue, type); | |
215 | return nsstringValue; | |
216 | } | |
217 | ||
218 | /* Objective-C name demangling. */ | |
219 | ||
220 | char * | |
221 | objc_demangle (const char *mangled, int options) | |
222 | { | |
223 | char *demangled, *cp; | |
224 | ||
225 | if (mangled[0] == '_' && | |
226 | (mangled[1] == 'i' || mangled[1] == 'c') && | |
227 | mangled[2] == '_') | |
228 | { | |
229 | cp = demangled = (char *) xmalloc (strlen (mangled) + 2); | |
230 | ||
231 | if (mangled[1] == 'i') | |
232 | *cp++ = '-'; /* for instance method */ | |
233 | else | |
234 | *cp++ = '+'; /* for class method */ | |
235 | ||
236 | *cp++ = '['; /* opening left brace */ | |
237 | strcpy(cp, mangled+3); /* Tack on the rest of the mangled name. */ | |
238 | ||
239 | while (*cp && *cp == '_') | |
240 | cp++; /* Skip any initial underbars in class | |
241 | name. */ | |
242 | ||
243 | cp = strchr(cp, '_'); | |
244 | if (!cp) /* Find first non-initial underbar. */ | |
245 | { | |
246 | xfree(demangled); /* not mangled name */ | |
247 | return NULL; | |
248 | } | |
249 | if (cp[1] == '_') /* Easy case: no category name. */ | |
250 | { | |
251 | *cp++ = ' '; /* Replace two '_' with one ' '. */ | |
252 | strcpy(cp, mangled + (cp - demangled) + 2); | |
253 | } | |
254 | else | |
255 | { | |
256 | *cp++ = '('; /* Less easy case: category name. */ | |
257 | cp = strchr(cp, '_'); | |
258 | if (!cp) | |
259 | { | |
260 | xfree(demangled); /* not mangled name */ | |
261 | return NULL; | |
262 | } | |
263 | *cp++ = ')'; | |
264 | *cp++ = ' '; /* Overwriting 1st char of method name... */ | |
265 | strcpy(cp, mangled + (cp - demangled)); /* Get it back. */ | |
266 | } | |
267 | ||
268 | while (*cp && *cp == '_') | |
269 | cp++; /* Skip any initial underbars in | |
270 | method name. */ | |
271 | ||
272 | for (; *cp; cp++) | |
273 | if (*cp == '_') | |
274 | *cp = ':'; /* Replace remaining '_' with ':'. */ | |
275 | ||
276 | *cp++ = ']'; /* closing right brace */ | |
277 | *cp++ = 0; /* string terminator */ | |
278 | return demangled; | |
279 | } | |
280 | else | |
281 | return NULL; /* Not an objc mangled name. */ | |
282 | } | |
283 | ||
284 | /* la_sniff_from_mangled_name for ObjC. */ | |
285 | ||
286 | static int | |
287 | objc_sniff_from_mangled_name (const char *mangled, char **demangled) | |
288 | { | |
289 | *demangled = objc_demangle (mangled, 0); | |
290 | return *demangled != NULL; | |
291 | } | |
292 | ||
293 | /* Determine if we are currently in the Objective-C dispatch function. | |
294 | If so, get the address of the method function that the dispatcher | |
295 | would call and use that as the function to step into instead. Also | |
296 | skip over the trampoline for the function (if any). This is better | |
297 | for the user since they are only interested in stepping into the | |
298 | method function anyway. */ | |
299 | static CORE_ADDR | |
300 | objc_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) | |
301 | { | |
302 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
303 | CORE_ADDR real_stop_pc; | |
304 | CORE_ADDR method_stop_pc; | |
305 | ||
306 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
307 | ||
308 | if (real_stop_pc != 0) | |
309 | find_objc_msgcall (real_stop_pc, &method_stop_pc); | |
310 | else | |
311 | find_objc_msgcall (stop_pc, &method_stop_pc); | |
312 | ||
313 | if (method_stop_pc) | |
314 | { | |
315 | real_stop_pc = gdbarch_skip_trampoline_code | |
316 | (gdbarch, frame, method_stop_pc); | |
317 | if (real_stop_pc == 0) | |
318 | real_stop_pc = method_stop_pc; | |
319 | } | |
320 | ||
321 | return real_stop_pc; | |
322 | } | |
323 | ||
324 | ||
325 | /* Table mapping opcodes into strings for printing operators | |
326 | and precedences of the operators. */ | |
327 | ||
328 | static const struct op_print objc_op_print_tab[] = | |
329 | { | |
330 | {",", BINOP_COMMA, PREC_COMMA, 0}, | |
331 | {"=", BINOP_ASSIGN, PREC_ASSIGN, 1}, | |
332 | {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, | |
333 | {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, | |
334 | {"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, | |
335 | {"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, | |
336 | {"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, | |
337 | {"==", BINOP_EQUAL, PREC_EQUAL, 0}, | |
338 | {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0}, | |
339 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, | |
340 | {">=", BINOP_GEQ, PREC_ORDER, 0}, | |
341 | {">", BINOP_GTR, PREC_ORDER, 0}, | |
342 | {"<", BINOP_LESS, PREC_ORDER, 0}, | |
343 | {">>", BINOP_RSH, PREC_SHIFT, 0}, | |
344 | {"<<", BINOP_LSH, PREC_SHIFT, 0}, | |
345 | {"+", BINOP_ADD, PREC_ADD, 0}, | |
346 | {"-", BINOP_SUB, PREC_ADD, 0}, | |
347 | {"*", BINOP_MUL, PREC_MUL, 0}, | |
348 | {"/", BINOP_DIV, PREC_MUL, 0}, | |
349 | {"%", BINOP_REM, PREC_MUL, 0}, | |
350 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, | |
351 | {"-", UNOP_NEG, PREC_PREFIX, 0}, | |
352 | {"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, | |
353 | {"~", UNOP_COMPLEMENT, PREC_PREFIX, 0}, | |
354 | {"*", UNOP_IND, PREC_PREFIX, 0}, | |
355 | {"&", UNOP_ADDR, PREC_PREFIX, 0}, | |
356 | {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0}, | |
357 | {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0}, | |
358 | {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0}, | |
359 | {NULL, OP_NULL, PREC_NULL, 0} | |
360 | }; | |
361 | ||
362 | static const char *objc_extensions[] = | |
363 | { | |
364 | ".m", NULL | |
365 | }; | |
366 | ||
367 | extern const struct language_defn objc_language_defn = { | |
368 | "objective-c", /* Language name */ | |
369 | "Objective-C", | |
370 | language_objc, | |
371 | range_check_off, | |
372 | case_sensitive_on, | |
373 | array_row_major, | |
374 | macro_expansion_c, | |
375 | objc_extensions, | |
376 | &exp_descriptor_standard, | |
377 | c_parse, | |
378 | null_post_parser, | |
379 | c_printchar, /* Print a character constant */ | |
380 | c_printstr, /* Function to print string constant */ | |
381 | c_emit_char, | |
382 | c_print_type, /* Print a type using appropriate syntax */ | |
383 | c_print_typedef, /* Print a typedef using appropriate syntax */ | |
384 | c_val_print, /* Print a value using appropriate syntax */ | |
385 | c_value_print, /* Print a top-level value */ | |
386 | default_read_var_value, /* la_read_var_value */ | |
387 | objc_skip_trampoline, /* Language specific skip_trampoline */ | |
388 | "self", /* name_of_this */ | |
389 | false, /* la_store_sym_names_in_linkage_form_p */ | |
390 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ | |
391 | basic_lookup_transparent_type,/* lookup_transparent_type */ | |
392 | objc_demangle, /* Language specific symbol demangler */ | |
393 | objc_sniff_from_mangled_name, | |
394 | NULL, /* Language specific | |
395 | class_name_from_physname */ | |
396 | objc_op_print_tab, /* Expression operators for printing */ | |
397 | 1, /* C-style arrays */ | |
398 | 0, /* String lower bound */ | |
399 | default_word_break_characters, | |
400 | default_collect_symbol_completion_matches, | |
401 | c_language_arch_info, | |
402 | default_print_array_index, | |
403 | default_pass_by_reference, | |
404 | default_get_string, | |
405 | c_watch_location_expression, | |
406 | NULL, /* la_get_symbol_name_matcher */ | |
407 | iterate_over_symbols, | |
408 | default_search_name_hash, | |
409 | &default_varobj_ops, | |
410 | NULL, | |
411 | NULL, | |
412 | c_is_string_type_p, | |
413 | "{...}" /* la_struct_too_deep_ellipsis */ | |
414 | }; | |
415 | ||
416 | /* | |
417 | * ObjC: | |
418 | * Following functions help construct Objective-C message calls. | |
419 | */ | |
420 | ||
421 | struct selname /* For parsing Objective-C. */ | |
422 | { | |
423 | struct selname *next; | |
424 | char *msglist_sel; | |
425 | int msglist_len; | |
426 | }; | |
427 | ||
428 | static int msglist_len; | |
429 | static struct selname *selname_chain; | |
430 | static char *msglist_sel; | |
431 | ||
432 | void | |
433 | start_msglist(void) | |
434 | { | |
435 | struct selname *newobj = XNEW (struct selname); | |
436 | ||
437 | newobj->next = selname_chain; | |
438 | newobj->msglist_len = msglist_len; | |
439 | newobj->msglist_sel = msglist_sel; | |
440 | msglist_len = 0; | |
441 | msglist_sel = (char *)xmalloc(1); | |
442 | *msglist_sel = 0; | |
443 | selname_chain = newobj; | |
444 | } | |
445 | ||
446 | void | |
447 | add_msglist(struct stoken *str, int addcolon) | |
448 | { | |
449 | char *s; | |
450 | const char *p; | |
451 | int len, plen; | |
452 | ||
453 | if (str == 0) /* Unnamed arg, or... */ | |
454 | { | |
455 | if (addcolon == 0) /* variable number of args. */ | |
456 | { | |
457 | msglist_len++; | |
458 | return; | |
459 | } | |
460 | p = ""; | |
461 | plen = 0; | |
462 | } | |
463 | else | |
464 | { | |
465 | p = str->ptr; | |
466 | plen = str->length; | |
467 | } | |
468 | len = plen + strlen(msglist_sel) + 2; | |
469 | s = (char *)xmalloc(len); | |
470 | strcpy(s, msglist_sel); | |
471 | strncat(s, p, plen); | |
472 | xfree(msglist_sel); | |
473 | msglist_sel = s; | |
474 | if (addcolon) | |
475 | { | |
476 | s[len-2] = ':'; | |
477 | s[len-1] = 0; | |
478 | msglist_len++; | |
479 | } | |
480 | else | |
481 | s[len-2] = '\0'; | |
482 | } | |
483 | ||
484 | int | |
485 | end_msglist (struct parser_state *ps) | |
486 | { | |
487 | int val = msglist_len; | |
488 | struct selname *sel = selname_chain; | |
489 | char *p = msglist_sel; | |
490 | CORE_ADDR selid; | |
491 | ||
492 | selname_chain = sel->next; | |
493 | msglist_len = sel->msglist_len; | |
494 | msglist_sel = sel->msglist_sel; | |
495 | selid = lookup_child_selector (ps->gdbarch (), p); | |
496 | if (!selid) | |
497 | error (_("Can't find selector \"%s\""), p); | |
498 | write_exp_elt_longcst (ps, selid); | |
499 | xfree(p); | |
500 | write_exp_elt_longcst (ps, val); /* Number of args */ | |
501 | xfree(sel); | |
502 | ||
503 | return val; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Function: specialcmp (const char *a, const char *b) | |
508 | * | |
509 | * Special strcmp: treats ']' and ' ' as end-of-string. | |
510 | * Used for qsorting lists of objc methods (either by class or selector). | |
511 | */ | |
512 | ||
513 | static int | |
514 | specialcmp (const char *a, const char *b) | |
515 | { | |
516 | while (*a && *a != ' ' && *a != ']' && *b && *b != ' ' && *b != ']') | |
517 | { | |
518 | if (*a != *b) | |
519 | return *a - *b; | |
520 | a++, b++; | |
521 | } | |
522 | if (*a && *a != ' ' && *a != ']') | |
523 | return 1; /* a is longer therefore greater. */ | |
524 | if (*b && *b != ' ' && *b != ']') | |
525 | return -1; /* a is shorter therefore lesser. */ | |
526 | return 0; /* a and b are identical. */ | |
527 | } | |
528 | ||
529 | /* | |
530 | * Function: compare_selectors (const void *, const void *) | |
531 | * | |
532 | * Comparison function for use with qsort. Arguments are symbols or | |
533 | * msymbols Compares selector part of objc method name alphabetically. | |
534 | */ | |
535 | ||
536 | static int | |
537 | compare_selectors (const void *a, const void *b) | |
538 | { | |
539 | const char *aname, *bname; | |
540 | ||
541 | aname = SYMBOL_PRINT_NAME (*(struct symbol **) a); | |
542 | bname = SYMBOL_PRINT_NAME (*(struct symbol **) b); | |
543 | if (aname == NULL || bname == NULL) | |
544 | error (_("internal: compare_selectors(1)")); | |
545 | ||
546 | aname = strchr(aname, ' '); | |
547 | bname = strchr(bname, ' '); | |
548 | if (aname == NULL || bname == NULL) | |
549 | error (_("internal: compare_selectors(2)")); | |
550 | ||
551 | return specialcmp (aname+1, bname+1); | |
552 | } | |
553 | ||
554 | /* | |
555 | * Function: selectors_info (regexp, from_tty) | |
556 | * | |
557 | * Implements the "Info selectors" command. Takes an optional regexp | |
558 | * arg. Lists all objective c selectors that match the regexp. Works | |
559 | * by grepping thru all symbols for objective c methods. Output list | |
560 | * is sorted and uniqued. | |
561 | */ | |
562 | ||
563 | static void | |
564 | info_selectors_command (const char *regexp, int from_tty) | |
565 | { | |
566 | const char *name; | |
567 | char *val; | |
568 | int matches = 0; | |
569 | int maxlen = 0; | |
570 | int ix; | |
571 | char myregexp[2048]; | |
572 | char asel[256]; | |
573 | struct symbol **sym_arr; | |
574 | int plusminus = 0; | |
575 | ||
576 | if (regexp == NULL) | |
577 | strcpy(myregexp, ".*]"); /* Null input, match all objc methods. */ | |
578 | else | |
579 | { | |
580 | if (*regexp == '+' || *regexp == '-') | |
581 | { /* User wants only class methods or only instance methods. */ | |
582 | plusminus = *regexp++; | |
583 | while (*regexp == ' ' || *regexp == '\t') | |
584 | regexp++; | |
585 | } | |
586 | if (*regexp == '\0') | |
587 | strcpy(myregexp, ".*]"); | |
588 | else | |
589 | { | |
590 | /* Allow a few extra bytes because of the strcat below. */ | |
591 | if (sizeof (myregexp) < strlen (regexp) + 4) | |
592 | error (_("Regexp is too long: %s"), regexp); | |
593 | strcpy(myregexp, regexp); | |
594 | if (myregexp[strlen(myregexp) - 1] == '$') /* end of selector */ | |
595 | myregexp[strlen(myregexp) - 1] = ']'; /* end of method name */ | |
596 | else | |
597 | strcat(myregexp, ".*]"); | |
598 | } | |
599 | } | |
600 | ||
601 | if (regexp != NULL) | |
602 | { | |
603 | val = re_comp (myregexp); | |
604 | if (val != 0) | |
605 | error (_("Invalid regexp (%s): %s"), val, regexp); | |
606 | } | |
607 | ||
608 | /* First time thru is JUST to get max length and count. */ | |
609 | for (objfile *objfile : current_program_space->objfiles ()) | |
610 | { | |
611 | for (minimal_symbol *msymbol : objfile->msymbols ()) | |
612 | { | |
613 | QUIT; | |
614 | name = MSYMBOL_NATURAL_NAME (msymbol); | |
615 | if (name | |
616 | && (name[0] == '-' || name[0] == '+') | |
617 | && name[1] == '[') /* Got a method name. */ | |
618 | { | |
619 | /* Filter for class/instance methods. */ | |
620 | if (plusminus && name[0] != plusminus) | |
621 | continue; | |
622 | /* Find selector part. */ | |
623 | name = (char *) strchr (name+2, ' '); | |
624 | if (name == NULL) | |
625 | { | |
626 | complaint (_("Bad method name '%s'"), | |
627 | MSYMBOL_NATURAL_NAME (msymbol)); | |
628 | continue; | |
629 | } | |
630 | if (regexp == NULL || re_exec(++name) != 0) | |
631 | { | |
632 | const char *mystart = name; | |
633 | const char *myend = strchr (mystart, ']'); | |
634 | ||
635 | if (myend && (myend - mystart > maxlen)) | |
636 | maxlen = myend - mystart; /* Get longest selector. */ | |
637 | matches++; | |
638 | } | |
639 | } | |
640 | } | |
641 | } | |
642 | if (matches) | |
643 | { | |
644 | printf_filtered (_("Selectors matching \"%s\":\n\n"), | |
645 | regexp ? regexp : "*"); | |
646 | ||
647 | sym_arr = XALLOCAVEC (struct symbol *, matches); | |
648 | matches = 0; | |
649 | for (objfile *objfile : current_program_space->objfiles ()) | |
650 | { | |
651 | for (minimal_symbol *msymbol : objfile->msymbols ()) | |
652 | { | |
653 | QUIT; | |
654 | name = MSYMBOL_NATURAL_NAME (msymbol); | |
655 | if (name && | |
656 | (name[0] == '-' || name[0] == '+') && | |
657 | name[1] == '[') /* Got a method name. */ | |
658 | { | |
659 | /* Filter for class/instance methods. */ | |
660 | if (plusminus && name[0] != plusminus) | |
661 | continue; | |
662 | /* Find selector part. */ | |
663 | name = (char *) strchr(name+2, ' '); | |
664 | if (regexp == NULL || re_exec(++name) != 0) | |
665 | sym_arr[matches++] = (struct symbol *) msymbol; | |
666 | } | |
667 | } | |
668 | } | |
669 | ||
670 | qsort (sym_arr, matches, sizeof (struct minimal_symbol *), | |
671 | compare_selectors); | |
672 | /* Prevent compare on first iteration. */ | |
673 | asel[0] = 0; | |
674 | for (ix = 0; ix < matches; ix++) /* Now do the output. */ | |
675 | { | |
676 | char *p = asel; | |
677 | ||
678 | QUIT; | |
679 | name = SYMBOL_NATURAL_NAME (sym_arr[ix]); | |
680 | name = strchr (name, ' ') + 1; | |
681 | if (p[0] && specialcmp(name, p) == 0) | |
682 | continue; /* Seen this one already (not unique). */ | |
683 | ||
684 | /* Copy selector part. */ | |
685 | while (*name && *name != ']') | |
686 | *p++ = *name++; | |
687 | *p++ = '\0'; | |
688 | /* Print in columns. */ | |
689 | puts_filtered_tabular(asel, maxlen + 1, 0); | |
690 | } | |
691 | begin_line(); | |
692 | } | |
693 | else | |
694 | printf_filtered (_("No selectors matching \"%s\"\n"), | |
695 | regexp ? regexp : "*"); | |
696 | } | |
697 | ||
698 | /* | |
699 | * Function: compare_classes (const void *, const void *) | |
700 | * | |
701 | * Comparison function for use with qsort. Arguments are symbols or | |
702 | * msymbols Compares class part of objc method name alphabetically. | |
703 | */ | |
704 | ||
705 | static int | |
706 | compare_classes (const void *a, const void *b) | |
707 | { | |
708 | const char *aname, *bname; | |
709 | ||
710 | aname = SYMBOL_PRINT_NAME (*(struct symbol **) a); | |
711 | bname = SYMBOL_PRINT_NAME (*(struct symbol **) b); | |
712 | if (aname == NULL || bname == NULL) | |
713 | error (_("internal: compare_classes(1)")); | |
714 | ||
715 | return specialcmp (aname+1, bname+1); | |
716 | } | |
717 | ||
718 | /* | |
719 | * Function: classes_info(regexp, from_tty) | |
720 | * | |
721 | * Implements the "info classes" command for objective c classes. | |
722 | * Lists all objective c classes that match the optional regexp. | |
723 | * Works by grepping thru the list of objective c methods. List will | |
724 | * be sorted and uniqued (since one class may have many methods). | |
725 | * BUGS: will not list a class that has no methods. | |
726 | */ | |
727 | ||
728 | static void | |
729 | info_classes_command (const char *regexp, int from_tty) | |
730 | { | |
731 | const char *name; | |
732 | char *val; | |
733 | int matches = 0; | |
734 | int maxlen = 0; | |
735 | int ix; | |
736 | char myregexp[2048]; | |
737 | char aclass[256]; | |
738 | struct symbol **sym_arr; | |
739 | ||
740 | if (regexp == NULL) | |
741 | strcpy(myregexp, ".* "); /* Null input: match all objc classes. */ | |
742 | else | |
743 | { | |
744 | /* Allow a few extra bytes because of the strcat below. */ | |
745 | if (sizeof (myregexp) < strlen (regexp) + 4) | |
746 | error (_("Regexp is too long: %s"), regexp); | |
747 | strcpy(myregexp, regexp); | |
748 | if (myregexp[strlen(myregexp) - 1] == '$') | |
749 | /* In the method name, the end of the class name is marked by ' '. */ | |
750 | myregexp[strlen(myregexp) - 1] = ' '; | |
751 | else | |
752 | strcat(myregexp, ".* "); | |
753 | } | |
754 | ||
755 | if (regexp != NULL) | |
756 | { | |
757 | val = re_comp (myregexp); | |
758 | if (val != 0) | |
759 | error (_("Invalid regexp (%s): %s"), val, regexp); | |
760 | } | |
761 | ||
762 | /* First time thru is JUST to get max length and count. */ | |
763 | for (objfile *objfile : current_program_space->objfiles ()) | |
764 | { | |
765 | for (minimal_symbol *msymbol : objfile->msymbols ()) | |
766 | { | |
767 | QUIT; | |
768 | name = MSYMBOL_NATURAL_NAME (msymbol); | |
769 | if (name && | |
770 | (name[0] == '-' || name[0] == '+') && | |
771 | name[1] == '[') /* Got a method name. */ | |
772 | if (regexp == NULL || re_exec(name+2) != 0) | |
773 | { | |
774 | /* Compute length of classname part. */ | |
775 | const char *mystart = name + 2; | |
776 | const char *myend = strchr (mystart, ' '); | |
777 | ||
778 | if (myend && (myend - mystart > maxlen)) | |
779 | maxlen = myend - mystart; | |
780 | matches++; | |
781 | } | |
782 | } | |
783 | } | |
784 | if (matches) | |
785 | { | |
786 | printf_filtered (_("Classes matching \"%s\":\n\n"), | |
787 | regexp ? regexp : "*"); | |
788 | sym_arr = XALLOCAVEC (struct symbol *, matches); | |
789 | matches = 0; | |
790 | for (objfile *objfile : current_program_space->objfiles ()) | |
791 | { | |
792 | for (minimal_symbol *msymbol : objfile->msymbols ()) | |
793 | { | |
794 | QUIT; | |
795 | name = MSYMBOL_NATURAL_NAME (msymbol); | |
796 | if (name && | |
797 | (name[0] == '-' || name[0] == '+') && | |
798 | name[1] == '[') /* Got a method name. */ | |
799 | if (regexp == NULL || re_exec(name+2) != 0) | |
800 | sym_arr[matches++] = (struct symbol *) msymbol; | |
801 | } | |
802 | } | |
803 | ||
804 | qsort (sym_arr, matches, sizeof (struct minimal_symbol *), | |
805 | compare_classes); | |
806 | /* Prevent compare on first iteration. */ | |
807 | aclass[0] = 0; | |
808 | for (ix = 0; ix < matches; ix++) /* Now do the output. */ | |
809 | { | |
810 | char *p = aclass; | |
811 | ||
812 | QUIT; | |
813 | name = SYMBOL_NATURAL_NAME (sym_arr[ix]); | |
814 | name += 2; | |
815 | if (p[0] && specialcmp(name, p) == 0) | |
816 | continue; /* Seen this one already (not unique). */ | |
817 | ||
818 | /* Copy class part of method name. */ | |
819 | while (*name && *name != ' ') | |
820 | *p++ = *name++; | |
821 | *p++ = '\0'; | |
822 | /* Print in columns. */ | |
823 | puts_filtered_tabular(aclass, maxlen + 1, 0); | |
824 | } | |
825 | begin_line(); | |
826 | } | |
827 | else | |
828 | printf_filtered (_("No classes matching \"%s\"\n"), regexp ? regexp : "*"); | |
829 | } | |
830 | ||
831 | static char * | |
832 | parse_selector (char *method, char **selector) | |
833 | { | |
834 | char *s1 = NULL; | |
835 | char *s2 = NULL; | |
836 | int found_quote = 0; | |
837 | ||
838 | char *nselector = NULL; | |
839 | ||
840 | gdb_assert (selector != NULL); | |
841 | ||
842 | s1 = method; | |
843 | ||
844 | s1 = skip_spaces (s1); | |
845 | if (*s1 == '\'') | |
846 | { | |
847 | found_quote = 1; | |
848 | s1++; | |
849 | } | |
850 | s1 = skip_spaces (s1); | |
851 | ||
852 | nselector = s1; | |
853 | s2 = s1; | |
854 | ||
855 | for (;;) | |
856 | { | |
857 | if (isalnum (*s2) || (*s2 == '_') || (*s2 == ':')) | |
858 | *s1++ = *s2; | |
859 | else if (isspace (*s2)) | |
860 | ; | |
861 | else if ((*s2 == '\0') || (*s2 == '\'')) | |
862 | break; | |
863 | else | |
864 | return NULL; | |
865 | s2++; | |
866 | } | |
867 | *s1++ = '\0'; | |
868 | ||
869 | s2 = skip_spaces (s2); | |
870 | if (found_quote) | |
871 | { | |
872 | if (*s2 == '\'') | |
873 | s2++; | |
874 | s2 = skip_spaces (s2); | |
875 | } | |
876 | ||
877 | if (selector != NULL) | |
878 | *selector = nselector; | |
879 | ||
880 | return s2; | |
881 | } | |
882 | ||
883 | static char * | |
884 | parse_method (char *method, char *type, char **theclass, | |
885 | char **category, char **selector) | |
886 | { | |
887 | char *s1 = NULL; | |
888 | char *s2 = NULL; | |
889 | int found_quote = 0; | |
890 | ||
891 | char ntype = '\0'; | |
892 | char *nclass = NULL; | |
893 | char *ncategory = NULL; | |
894 | char *nselector = NULL; | |
895 | ||
896 | gdb_assert (type != NULL); | |
897 | gdb_assert (theclass != NULL); | |
898 | gdb_assert (category != NULL); | |
899 | gdb_assert (selector != NULL); | |
900 | ||
901 | s1 = method; | |
902 | ||
903 | s1 = skip_spaces (s1); | |
904 | if (*s1 == '\'') | |
905 | { | |
906 | found_quote = 1; | |
907 | s1++; | |
908 | } | |
909 | s1 = skip_spaces (s1); | |
910 | ||
911 | if ((s1[0] == '+') || (s1[0] == '-')) | |
912 | ntype = *s1++; | |
913 | ||
914 | s1 = skip_spaces (s1); | |
915 | ||
916 | if (*s1 != '[') | |
917 | return NULL; | |
918 | s1++; | |
919 | ||
920 | nclass = s1; | |
921 | while (isalnum (*s1) || (*s1 == '_')) | |
922 | s1++; | |
923 | ||
924 | s2 = s1; | |
925 | s2 = skip_spaces (s2); | |
926 | ||
927 | if (*s2 == '(') | |
928 | { | |
929 | s2++; | |
930 | s2 = skip_spaces (s2); | |
931 | ncategory = s2; | |
932 | while (isalnum (*s2) || (*s2 == '_')) | |
933 | s2++; | |
934 | *s2++ = '\0'; | |
935 | } | |
936 | ||
937 | /* Truncate the class name now that we're not using the open paren. */ | |
938 | *s1++ = '\0'; | |
939 | ||
940 | nselector = s2; | |
941 | s1 = s2; | |
942 | ||
943 | for (;;) | |
944 | { | |
945 | if (isalnum (*s2) || (*s2 == '_') || (*s2 == ':')) | |
946 | *s1++ = *s2; | |
947 | else if (isspace (*s2)) | |
948 | ; | |
949 | else if (*s2 == ']') | |
950 | break; | |
951 | else | |
952 | return NULL; | |
953 | s2++; | |
954 | } | |
955 | *s1++ = '\0'; | |
956 | s2++; | |
957 | ||
958 | s2 = skip_spaces (s2); | |
959 | if (found_quote) | |
960 | { | |
961 | if (*s2 != '\'') | |
962 | return NULL; | |
963 | s2++; | |
964 | s2 = skip_spaces (s2); | |
965 | } | |
966 | ||
967 | if (type != NULL) | |
968 | *type = ntype; | |
969 | if (theclass != NULL) | |
970 | *theclass = nclass; | |
971 | if (category != NULL) | |
972 | *category = ncategory; | |
973 | if (selector != NULL) | |
974 | *selector = nselector; | |
975 | ||
976 | return s2; | |
977 | } | |
978 | ||
979 | static void | |
980 | find_methods (char type, const char *theclass, const char *category, | |
981 | const char *selector, | |
982 | std::vector<const char *> *symbol_names) | |
983 | { | |
984 | const char *symname = NULL; | |
985 | ||
986 | char ntype = '\0'; | |
987 | char *nclass = NULL; | |
988 | char *ncategory = NULL; | |
989 | char *nselector = NULL; | |
990 | ||
991 | static char *tmp = NULL; | |
992 | static unsigned int tmplen = 0; | |
993 | ||
994 | gdb_assert (symbol_names != NULL); | |
995 | ||
996 | for (objfile *objfile : current_program_space->objfiles ()) | |
997 | { | |
998 | unsigned int *objc_csym; | |
999 | ||
1000 | /* The objfile_csym variable counts the number of ObjC methods | |
1001 | that this objfile defines. We save that count as a private | |
1002 | objfile data. If we have already determined that this objfile | |
1003 | provides no ObjC methods, we can skip it entirely. */ | |
1004 | ||
1005 | unsigned int objfile_csym = 0; | |
1006 | ||
1007 | objc_csym = objc_objfile_data.get (objfile); | |
1008 | if (objc_csym != NULL && *objc_csym == 0) | |
1009 | /* There are no ObjC symbols in this objfile. Skip it entirely. */ | |
1010 | continue; | |
1011 | ||
1012 | for (minimal_symbol *msymbol : objfile->msymbols ()) | |
1013 | { | |
1014 | QUIT; | |
1015 | ||
1016 | /* Check the symbol name first as this can be done entirely without | |
1017 | sending any query to the target. */ | |
1018 | symname = MSYMBOL_NATURAL_NAME (msymbol); | |
1019 | if (symname == NULL) | |
1020 | continue; | |
1021 | ||
1022 | if ((symname[0] != '-' && symname[0] != '+') || (symname[1] != '[')) | |
1023 | /* Not a method name. */ | |
1024 | continue; | |
1025 | ||
1026 | objfile_csym++; | |
1027 | ||
1028 | /* Now that thinks are a bit sane, clean up the symname. */ | |
1029 | while ((strlen (symname) + 1) >= tmplen) | |
1030 | { | |
1031 | tmplen = (tmplen == 0) ? 1024 : tmplen * 2; | |
1032 | tmp = (char *) xrealloc (tmp, tmplen); | |
1033 | } | |
1034 | strcpy (tmp, symname); | |
1035 | ||
1036 | if (parse_method (tmp, &ntype, &nclass, | |
1037 | &ncategory, &nselector) == NULL) | |
1038 | continue; | |
1039 | ||
1040 | if ((type != '\0') && (ntype != type)) | |
1041 | continue; | |
1042 | ||
1043 | if ((theclass != NULL) | |
1044 | && ((nclass == NULL) || (strcmp (theclass, nclass) != 0))) | |
1045 | continue; | |
1046 | ||
1047 | if ((category != NULL) && | |
1048 | ((ncategory == NULL) || (strcmp (category, ncategory) != 0))) | |
1049 | continue; | |
1050 | ||
1051 | if ((selector != NULL) && | |
1052 | ((nselector == NULL) || (strcmp (selector, nselector) != 0))) | |
1053 | continue; | |
1054 | ||
1055 | symbol_names->push_back (symname); | |
1056 | } | |
1057 | ||
1058 | if (objc_csym == NULL) | |
1059 | objc_csym = objc_objfile_data.emplace (objfile, objfile_csym); | |
1060 | else | |
1061 | /* Count of ObjC methods in this objfile should be constant. */ | |
1062 | gdb_assert (*objc_csym == objfile_csym); | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /* Uniquify a VEC of strings. */ | |
1067 | ||
1068 | static void | |
1069 | uniquify_strings (std::vector<const char *> *strings) | |
1070 | { | |
1071 | if (strings->empty ()) | |
1072 | return; | |
1073 | ||
1074 | std::sort (strings->begin (), strings->end (), compare_cstrings); | |
1075 | strings->erase (std::unique (strings->begin (), strings->end (), streq), | |
1076 | strings->end ()); | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Function: find_imps (const char *selector, struct symbol **sym_arr) | |
1081 | * | |
1082 | * Input: a string representing a selector | |
1083 | * a pointer to an array of symbol pointers | |
1084 | * possibly a pointer to a symbol found by the caller. | |
1085 | * | |
1086 | * Output: number of methods that implement that selector. Side | |
1087 | * effects: The array of symbol pointers is filled with matching syms. | |
1088 | * | |
1089 | * By analogy with function "find_methods" (symtab.c), builds a list | |
1090 | * of symbols matching the ambiguous input, so that "decode_line_2" | |
1091 | * (symtab.c) can list them and ask the user to choose one or more. | |
1092 | * In this case the matches are objective c methods | |
1093 | * ("implementations") matching an objective c selector. | |
1094 | * | |
1095 | * Note that it is possible for a normal (c-style) function to have | |
1096 | * the same name as an objective c selector. To prevent the selector | |
1097 | * from eclipsing the function, we allow the caller (decode_line_1) to | |
1098 | * search for such a function first, and if it finds one, pass it in | |
1099 | * to us. We will then integrate it into the list. We also search | |
1100 | * for one here, among the minsyms. | |
1101 | * | |
1102 | * NOTE: if NUM_DEBUGGABLE is non-zero, the sym_arr will be divided | |
1103 | * into two parts: debuggable (struct symbol) syms, and | |
1104 | * non_debuggable (struct minimal_symbol) syms. The debuggable | |
1105 | * ones will come first, before NUM_DEBUGGABLE (which will thus | |
1106 | * be the index of the first non-debuggable one). | |
1107 | */ | |
1108 | ||
1109 | const char * | |
1110 | find_imps (const char *method, std::vector<const char *> *symbol_names) | |
1111 | { | |
1112 | char type = '\0'; | |
1113 | char *theclass = NULL; | |
1114 | char *category = NULL; | |
1115 | char *selector = NULL; | |
1116 | ||
1117 | char *buf = NULL; | |
1118 | char *tmp = NULL; | |
1119 | ||
1120 | int selector_case = 0; | |
1121 | ||
1122 | gdb_assert (symbol_names != NULL); | |
1123 | ||
1124 | buf = (char *) alloca (strlen (method) + 1); | |
1125 | strcpy (buf, method); | |
1126 | tmp = parse_method (buf, &type, &theclass, &category, &selector); | |
1127 | ||
1128 | if (tmp == NULL) | |
1129 | { | |
1130 | strcpy (buf, method); | |
1131 | tmp = parse_selector (buf, &selector); | |
1132 | ||
1133 | if (tmp == NULL) | |
1134 | return NULL; | |
1135 | ||
1136 | selector_case = 1; | |
1137 | } | |
1138 | ||
1139 | find_methods (type, theclass, category, selector, symbol_names); | |
1140 | ||
1141 | /* If we hit the "selector" case, and we found some methods, then | |
1142 | add the selector itself as a symbol, if it exists. */ | |
1143 | if (selector_case && !symbol_names->empty ()) | |
1144 | { | |
1145 | struct symbol *sym = lookup_symbol (selector, NULL, VAR_DOMAIN, | |
1146 | 0).symbol; | |
1147 | ||
1148 | if (sym != NULL) | |
1149 | symbol_names->push_back (SYMBOL_NATURAL_NAME (sym)); | |
1150 | else | |
1151 | { | |
1152 | struct bound_minimal_symbol msym | |
1153 | = lookup_minimal_symbol (selector, 0, 0); | |
1154 | ||
1155 | if (msym.minsym != NULL) | |
1156 | symbol_names->push_back (MSYMBOL_NATURAL_NAME (msym.minsym)); | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | uniquify_strings (symbol_names); | |
1161 | ||
1162 | return method + (tmp - buf); | |
1163 | } | |
1164 | ||
1165 | static void | |
1166 | print_object_command (const char *args, int from_tty) | |
1167 | { | |
1168 | struct value *object, *function, *description; | |
1169 | CORE_ADDR string_addr, object_addr; | |
1170 | int i = 0; | |
1171 | gdb_byte c = 0; | |
1172 | ||
1173 | if (!args || !*args) | |
1174 | error ( | |
1175 | "The 'print-object' command requires an argument (an Objective-C object)"); | |
1176 | ||
1177 | { | |
1178 | expression_up expr = parse_expression (args); | |
1179 | int pc = 0; | |
1180 | ||
1181 | object = evaluate_subexp (builtin_type (expr->gdbarch)->builtin_data_ptr, | |
1182 | expr.get (), &pc, EVAL_NORMAL); | |
1183 | } | |
1184 | ||
1185 | /* Validate the address for sanity. */ | |
1186 | object_addr = value_as_long (object); | |
1187 | read_memory (object_addr, &c, 1); | |
1188 | ||
1189 | function = find_function_in_inferior ("_NSPrintForDebugger", NULL); | |
1190 | if (function == NULL) | |
1191 | error (_("Unable to locate _NSPrintForDebugger in child process")); | |
1192 | ||
1193 | description = call_function_by_hand (function, NULL, object); | |
1194 | ||
1195 | string_addr = value_as_long (description); | |
1196 | if (string_addr == 0) | |
1197 | error (_("object returns null description")); | |
1198 | ||
1199 | read_memory (string_addr + i++, &c, 1); | |
1200 | if (c != 0) | |
1201 | do | |
1202 | { /* Read and print characters up to EOS. */ | |
1203 | QUIT; | |
1204 | printf_filtered ("%c", c); | |
1205 | read_memory (string_addr + i++, &c, 1); | |
1206 | } while (c != 0); | |
1207 | else | |
1208 | printf_filtered(_("<object returns empty description>")); | |
1209 | printf_filtered ("\n"); | |
1210 | } | |
1211 | ||
1212 | /* The data structure 'methcalls' is used to detect method calls (thru | |
1213 | * ObjC runtime lib functions objc_msgSend, objc_msgSendSuper, etc.), | |
1214 | * and ultimately find the method being called. | |
1215 | */ | |
1216 | ||
1217 | struct objc_methcall { | |
1218 | const char *name; | |
1219 | /* Return instance method to be called. */ | |
1220 | int (*stop_at) (CORE_ADDR, CORE_ADDR *); | |
1221 | /* Start of pc range corresponding to method invocation. */ | |
1222 | CORE_ADDR begin; | |
1223 | /* End of pc range corresponding to method invocation. */ | |
1224 | CORE_ADDR end; | |
1225 | }; | |
1226 | ||
1227 | static int resolve_msgsend (CORE_ADDR pc, CORE_ADDR *new_pc); | |
1228 | static int resolve_msgsend_stret (CORE_ADDR pc, CORE_ADDR *new_pc); | |
1229 | static int resolve_msgsend_super (CORE_ADDR pc, CORE_ADDR *new_pc); | |
1230 | static int resolve_msgsend_super_stret (CORE_ADDR pc, CORE_ADDR *new_pc); | |
1231 | ||
1232 | static struct objc_methcall methcalls[] = { | |
1233 | { "_objc_msgSend", resolve_msgsend, 0, 0}, | |
1234 | { "_objc_msgSend_stret", resolve_msgsend_stret, 0, 0}, | |
1235 | { "_objc_msgSendSuper", resolve_msgsend_super, 0, 0}, | |
1236 | { "_objc_msgSendSuper_stret", resolve_msgsend_super_stret, 0, 0}, | |
1237 | { "_objc_getClass", NULL, 0, 0}, | |
1238 | { "_objc_getMetaClass", NULL, 0, 0} | |
1239 | }; | |
1240 | ||
1241 | #define nmethcalls (sizeof (methcalls) / sizeof (methcalls[0])) | |
1242 | ||
1243 | /* The following function, "find_objc_msgsend", fills in the data | |
1244 | * structure "objc_msgs" by finding the addresses of each of the | |
1245 | * (currently four) functions that it holds (of which objc_msgSend is | |
1246 | * the first). This must be called each time symbols are loaded, in | |
1247 | * case the functions have moved for some reason. | |
1248 | */ | |
1249 | ||
1250 | static void | |
1251 | find_objc_msgsend (void) | |
1252 | { | |
1253 | unsigned int i; | |
1254 | ||
1255 | for (i = 0; i < nmethcalls; i++) | |
1256 | { | |
1257 | struct bound_minimal_symbol func; | |
1258 | ||
1259 | /* Try both with and without underscore. */ | |
1260 | func = lookup_bound_minimal_symbol (methcalls[i].name); | |
1261 | if ((func.minsym == NULL) && (methcalls[i].name[0] == '_')) | |
1262 | { | |
1263 | func = lookup_bound_minimal_symbol (methcalls[i].name + 1); | |
1264 | } | |
1265 | if (func.minsym == NULL) | |
1266 | { | |
1267 | methcalls[i].begin = 0; | |
1268 | methcalls[i].end = 0; | |
1269 | continue; | |
1270 | } | |
1271 | ||
1272 | methcalls[i].begin = BMSYMBOL_VALUE_ADDRESS (func); | |
1273 | methcalls[i].end = minimal_symbol_upper_bound (func); | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* find_objc_msgcall (replaces pc_off_limits) | |
1278 | * | |
1279 | * ALL that this function now does is to determine whether the input | |
1280 | * address ("pc") is the address of one of the Objective-C message | |
1281 | * dispatch functions (mainly objc_msgSend or objc_msgSendSuper), and | |
1282 | * if so, it returns the address of the method that will be called. | |
1283 | * | |
1284 | * The old function "pc_off_limits" used to do a lot of other things | |
1285 | * in addition, such as detecting shared library jump stubs and | |
1286 | * returning the address of the shlib function that would be called. | |
1287 | * That functionality has been moved into the gdbarch_skip_trampoline_code and | |
1288 | * IN_SOLIB_TRAMPOLINE macros, which are resolved in the target- | |
1289 | * dependent modules. | |
1290 | */ | |
1291 | ||
1292 | static int | |
1293 | find_objc_msgcall_submethod (int (*f) (CORE_ADDR, CORE_ADDR *), | |
1294 | CORE_ADDR pc, | |
1295 | CORE_ADDR *new_pc) | |
1296 | { | |
1297 | try | |
1298 | { | |
1299 | if (f (pc, new_pc) == 0) | |
1300 | return 1; | |
1301 | } | |
1302 | catch (const gdb_exception &ex) | |
1303 | { | |
1304 | exception_fprintf (gdb_stderr, ex, | |
1305 | "Unable to determine target of " | |
1306 | "Objective-C method call (ignoring):\n"); | |
1307 | } | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | int | |
1313 | find_objc_msgcall (CORE_ADDR pc, CORE_ADDR *new_pc) | |
1314 | { | |
1315 | unsigned int i; | |
1316 | ||
1317 | find_objc_msgsend (); | |
1318 | if (new_pc != NULL) | |
1319 | { | |
1320 | *new_pc = 0; | |
1321 | } | |
1322 | ||
1323 | for (i = 0; i < nmethcalls; i++) | |
1324 | if ((pc >= methcalls[i].begin) && (pc < methcalls[i].end)) | |
1325 | { | |
1326 | if (methcalls[i].stop_at != NULL) | |
1327 | return find_objc_msgcall_submethod (methcalls[i].stop_at, | |
1328 | pc, new_pc); | |
1329 | else | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | void | |
1337 | _initialize_objc_language (void) | |
1338 | { | |
1339 | add_info ("selectors", info_selectors_command, | |
1340 | _("All Objective-C selectors, or those matching REGEXP.")); | |
1341 | add_info ("classes", info_classes_command, | |
1342 | _("All Objective-C classes, or those matching REGEXP.")); | |
1343 | add_com ("print-object", class_vars, print_object_command, | |
1344 | _("Ask an Objective-C object to print itself.")); | |
1345 | add_com_alias ("po", "print-object", class_vars, 1); | |
1346 | } | |
1347 | ||
1348 | static void | |
1349 | read_objc_method (struct gdbarch *gdbarch, CORE_ADDR addr, | |
1350 | struct objc_method *method) | |
1351 | { | |
1352 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1353 | ||
1354 | method->name = read_memory_unsigned_integer (addr + 0, 4, byte_order); | |
1355 | method->types = read_memory_unsigned_integer (addr + 4, 4, byte_order); | |
1356 | method->imp = read_memory_unsigned_integer (addr + 8, 4, byte_order); | |
1357 | } | |
1358 | ||
1359 | static unsigned long | |
1360 | read_objc_methlist_nmethods (struct gdbarch *gdbarch, CORE_ADDR addr) | |
1361 | { | |
1362 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1363 | ||
1364 | return read_memory_unsigned_integer (addr + 4, 4, byte_order); | |
1365 | } | |
1366 | ||
1367 | static void | |
1368 | read_objc_methlist_method (struct gdbarch *gdbarch, CORE_ADDR addr, | |
1369 | unsigned long num, struct objc_method *method) | |
1370 | { | |
1371 | gdb_assert (num < read_objc_methlist_nmethods (gdbarch, addr)); | |
1372 | read_objc_method (gdbarch, addr + 8 + (12 * num), method); | |
1373 | } | |
1374 | ||
1375 | static void | |
1376 | read_objc_object (struct gdbarch *gdbarch, CORE_ADDR addr, | |
1377 | struct objc_object *object) | |
1378 | { | |
1379 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1380 | ||
1381 | object->isa = read_memory_unsigned_integer (addr, 4, byte_order); | |
1382 | } | |
1383 | ||
1384 | static void | |
1385 | read_objc_super (struct gdbarch *gdbarch, CORE_ADDR addr, | |
1386 | struct objc_super *super) | |
1387 | { | |
1388 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1389 | ||
1390 | super->receiver = read_memory_unsigned_integer (addr, 4, byte_order); | |
1391 | super->theclass = read_memory_unsigned_integer (addr + 4, 4, byte_order); | |
1392 | }; | |
1393 | ||
1394 | static void | |
1395 | read_objc_class (struct gdbarch *gdbarch, CORE_ADDR addr, | |
1396 | struct objc_class *theclass) | |
1397 | { | |
1398 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1399 | ||
1400 | theclass->isa = read_memory_unsigned_integer (addr, 4, byte_order); | |
1401 | theclass->super_class = read_memory_unsigned_integer (addr + 4, 4, byte_order); | |
1402 | theclass->name = read_memory_unsigned_integer (addr + 8, 4, byte_order); | |
1403 | theclass->version = read_memory_unsigned_integer (addr + 12, 4, byte_order); | |
1404 | theclass->info = read_memory_unsigned_integer (addr + 16, 4, byte_order); | |
1405 | theclass->instance_size = read_memory_unsigned_integer (addr + 18, 4, | |
1406 | byte_order); | |
1407 | theclass->ivars = read_memory_unsigned_integer (addr + 24, 4, byte_order); | |
1408 | theclass->methods = read_memory_unsigned_integer (addr + 28, 4, byte_order); | |
1409 | theclass->cache = read_memory_unsigned_integer (addr + 32, 4, byte_order); | |
1410 | theclass->protocols = read_memory_unsigned_integer (addr + 36, 4, byte_order); | |
1411 | } | |
1412 | ||
1413 | static CORE_ADDR | |
1414 | find_implementation_from_class (struct gdbarch *gdbarch, | |
1415 | CORE_ADDR theclass, CORE_ADDR sel) | |
1416 | { | |
1417 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1418 | CORE_ADDR subclass = theclass; | |
1419 | ||
1420 | while (subclass != 0) | |
1421 | { | |
1422 | ||
1423 | struct objc_class class_str; | |
1424 | unsigned mlistnum = 0; | |
1425 | ||
1426 | read_objc_class (gdbarch, subclass, &class_str); | |
1427 | ||
1428 | for (;;) | |
1429 | { | |
1430 | CORE_ADDR mlist; | |
1431 | unsigned long nmethods; | |
1432 | unsigned long i; | |
1433 | ||
1434 | mlist = read_memory_unsigned_integer (class_str.methods + | |
1435 | (4 * mlistnum), | |
1436 | 4, byte_order); | |
1437 | if (mlist == 0) | |
1438 | break; | |
1439 | ||
1440 | nmethods = read_objc_methlist_nmethods (gdbarch, mlist); | |
1441 | ||
1442 | for (i = 0; i < nmethods; i++) | |
1443 | { | |
1444 | struct objc_method meth_str; | |
1445 | ||
1446 | read_objc_methlist_method (gdbarch, mlist, i, &meth_str); | |
1447 | ||
1448 | if (meth_str.name == sel) | |
1449 | /* FIXME: hppa arch was doing a pointer dereference | |
1450 | here. There needs to be a better way to do that. */ | |
1451 | return meth_str.imp; | |
1452 | } | |
1453 | mlistnum++; | |
1454 | } | |
1455 | subclass = class_str.super_class; | |
1456 | } | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static CORE_ADDR | |
1462 | find_implementation (struct gdbarch *gdbarch, | |
1463 | CORE_ADDR object, CORE_ADDR sel) | |
1464 | { | |
1465 | struct objc_object ostr; | |
1466 | ||
1467 | if (object == 0) | |
1468 | return 0; | |
1469 | read_objc_object (gdbarch, object, &ostr); | |
1470 | if (ostr.isa == 0) | |
1471 | return 0; | |
1472 | ||
1473 | return find_implementation_from_class (gdbarch, ostr.isa, sel); | |
1474 | } | |
1475 | ||
1476 | static int | |
1477 | resolve_msgsend (CORE_ADDR pc, CORE_ADDR *new_pc) | |
1478 | { | |
1479 | struct frame_info *frame = get_current_frame (); | |
1480 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1481 | struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr; | |
1482 | ||
1483 | CORE_ADDR object; | |
1484 | CORE_ADDR sel; | |
1485 | CORE_ADDR res; | |
1486 | ||
1487 | object = gdbarch_fetch_pointer_argument (gdbarch, frame, 0, ptr_type); | |
1488 | sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type); | |
1489 | ||
1490 | res = find_implementation (gdbarch, object, sel); | |
1491 | if (new_pc != 0) | |
1492 | *new_pc = res; | |
1493 | if (res == 0) | |
1494 | return 1; | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static int | |
1499 | resolve_msgsend_stret (CORE_ADDR pc, CORE_ADDR *new_pc) | |
1500 | { | |
1501 | struct frame_info *frame = get_current_frame (); | |
1502 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1503 | struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr; | |
1504 | ||
1505 | CORE_ADDR object; | |
1506 | CORE_ADDR sel; | |
1507 | CORE_ADDR res; | |
1508 | ||
1509 | object = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type); | |
1510 | sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 2, ptr_type); | |
1511 | ||
1512 | res = find_implementation (gdbarch, object, sel); | |
1513 | if (new_pc != 0) | |
1514 | *new_pc = res; | |
1515 | if (res == 0) | |
1516 | return 1; | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | static int | |
1521 | resolve_msgsend_super (CORE_ADDR pc, CORE_ADDR *new_pc) | |
1522 | { | |
1523 | struct frame_info *frame = get_current_frame (); | |
1524 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1525 | struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr; | |
1526 | ||
1527 | struct objc_super sstr; | |
1528 | ||
1529 | CORE_ADDR super; | |
1530 | CORE_ADDR sel; | |
1531 | CORE_ADDR res; | |
1532 | ||
1533 | super = gdbarch_fetch_pointer_argument (gdbarch, frame, 0, ptr_type); | |
1534 | sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type); | |
1535 | ||
1536 | read_objc_super (gdbarch, super, &sstr); | |
1537 | if (sstr.theclass == 0) | |
1538 | return 0; | |
1539 | ||
1540 | res = find_implementation_from_class (gdbarch, sstr.theclass, sel); | |
1541 | if (new_pc != 0) | |
1542 | *new_pc = res; | |
1543 | if (res == 0) | |
1544 | return 1; | |
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int | |
1549 | resolve_msgsend_super_stret (CORE_ADDR pc, CORE_ADDR *new_pc) | |
1550 | { | |
1551 | struct frame_info *frame = get_current_frame (); | |
1552 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1553 | struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr; | |
1554 | ||
1555 | struct objc_super sstr; | |
1556 | ||
1557 | CORE_ADDR super; | |
1558 | CORE_ADDR sel; | |
1559 | CORE_ADDR res; | |
1560 | ||
1561 | super = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type); | |
1562 | sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 2, ptr_type); | |
1563 | ||
1564 | read_objc_super (gdbarch, super, &sstr); | |
1565 | if (sstr.theclass == 0) | |
1566 | return 0; | |
1567 | ||
1568 | res = find_implementation_from_class (gdbarch, sstr.theclass, sel); | |
1569 | if (new_pc != 0) | |
1570 | *new_pc = res; | |
1571 | if (res == 0) | |
1572 | return 1; | |
1573 | return 0; | |
1574 | } |