Mercurial > hg > CbC > CbC_gcc
comparison gcc/objc/objc-act.c @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 /* Implement classes and message passing for Objective C. | |
2 Copyright (C) 1992-2017 Free Software Foundation, Inc. | |
3 Contributed by Steve Naroff. | |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify | |
8 it under the terms of the GNU General Public License as published by | |
9 the Free Software Foundation; either version 3, or (at your option) | |
10 any later version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, | |
13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 GNU General Public License for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #include "config.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
24 #include "tm.h" | |
25 #include "tree.h" | |
26 #include "stringpool.h" | |
27 #include "stor-layout.h" | |
28 #include "attribs.h" | |
29 | |
30 #ifdef OBJCPLUS | |
31 #include "cp/cp-tree.h" | |
32 #else | |
33 #include "c/c-tree.h" | |
34 #include "c/c-lang.h" | |
35 #endif | |
36 | |
37 #include "c-family/c-objc.h" | |
38 #include "langhooks.h" | |
39 #include "objc-act.h" | |
40 #include "objc-map.h" | |
41 #include "function.h" | |
42 #include "toplev.h" | |
43 #include "debug.h" | |
44 #include "c-family/c-target.h" | |
45 #include "intl.h" | |
46 #include "cgraph.h" | |
47 #include "tree-iterator.h" | |
48 /* Different initialization, code gen and meta data generation for each | |
49 runtime. */ | |
50 #include "objc-runtime-hooks.h" | |
51 /* Routines used mainly by the runtimes. */ | |
52 #include "objc-runtime-shared-support.h" | |
53 /* For default_tree_printer (). */ | |
54 | |
55 /* For enum gimplify_status */ | |
56 #include "gimple-expr.h" | |
57 #include "gimplify.h" | |
58 | |
59 /* For encode_method_prototype(). */ | |
60 #include "objc-encoding.h" | |
61 | |
62 static unsigned int should_call_super_dealloc = 0; | |
63 | |
64 /* When building Objective-C++, we are not linking against the C front-end | |
65 and so need to replicate the C tree-construction functions in some way. */ | |
66 #ifdef OBJCPLUS | |
67 #define OBJCP_REMAP_FUNCTIONS | |
68 #include "objcp-decl.h" | |
69 #endif /* OBJCPLUS */ | |
70 | |
71 /* This is the default way of generating a method name. */ | |
72 /* This has the problem that "test_method:argument:" and | |
73 "test:method_argument:" will generate the same name | |
74 ("_i_Test__test_method_argument_" for an instance method of the | |
75 class "Test"), so you can't have them both in the same class! | |
76 Moreover, the demangling (going from | |
77 "_i_Test__test_method_argument" back to the original name) is | |
78 undefined because there are two correct ways of demangling the | |
79 name. */ | |
80 #ifndef OBJC_GEN_METHOD_LABEL | |
81 #define OBJC_GEN_METHOD_LABEL(BUF, IS_INST, CLASS_NAME, CAT_NAME, SEL_NAME, NUM) \ | |
82 do { \ | |
83 char *temp; \ | |
84 sprintf ((BUF), "_%s_%s_%s_%s", \ | |
85 ((IS_INST) ? "i" : "c"), \ | |
86 (CLASS_NAME), \ | |
87 ((CAT_NAME)? (CAT_NAME) : ""), \ | |
88 (SEL_NAME)); \ | |
89 for (temp = (BUF); *temp; temp++) \ | |
90 if (*temp == ':') *temp = '_'; \ | |
91 } while (0) | |
92 #endif | |
93 | |
94 /* These need specifying. */ | |
95 #ifndef OBJC_FORWARDING_STACK_OFFSET | |
96 #define OBJC_FORWARDING_STACK_OFFSET 0 | |
97 #endif | |
98 | |
99 #ifndef OBJC_FORWARDING_MIN_OFFSET | |
100 #define OBJC_FORWARDING_MIN_OFFSET 0 | |
101 #endif | |
102 | |
103 /*** Private Interface (procedures) ***/ | |
104 | |
105 /* Init stuff. */ | |
106 static void synth_module_prologue (void); | |
107 | |
108 /* Code generation. */ | |
109 | |
110 static tree start_class (enum tree_code, tree, tree, tree, tree); | |
111 static tree continue_class (tree); | |
112 static void finish_class (tree); | |
113 static void start_method_def (tree, tree); | |
114 | |
115 static tree start_protocol (enum tree_code, tree, tree, tree); | |
116 static tree build_method_decl (enum tree_code, tree, tree, tree, bool); | |
117 static tree objc_add_method (tree, tree, int, bool); | |
118 static tree add_instance_variable (tree, objc_ivar_visibility_kind, tree); | |
119 static tree build_ivar_reference (tree); | |
120 static tree is_ivar (tree, tree); | |
121 | |
122 /* We only need the following for ObjC; ObjC++ will use C++'s definition | |
123 of DERIVED_FROM_P. */ | |
124 #ifndef OBJCPLUS | |
125 static bool objc_derived_from_p (tree, tree); | |
126 #define DERIVED_FROM_P(PARENT, CHILD) objc_derived_from_p (PARENT, CHILD) | |
127 #endif | |
128 | |
129 /* Property. */ | |
130 static void objc_gen_property_data (tree, tree); | |
131 static void objc_synthesize_getter (tree, tree, tree); | |
132 static void objc_synthesize_setter (tree, tree, tree); | |
133 static tree lookup_property (tree, tree); | |
134 static tree lookup_property_in_list (tree, tree); | |
135 static tree lookup_property_in_protocol_list (tree, tree); | |
136 static void build_common_objc_property_accessor_helpers (void); | |
137 | |
138 static void objc_xref_basetypes (tree, tree); | |
139 | |
140 static tree get_class_ivars (tree, bool); | |
141 | |
142 static void build_fast_enumeration_state_template (void); | |
143 | |
144 #ifdef OBJCPLUS | |
145 static void objc_generate_cxx_cdtors (void); | |
146 #endif | |
147 | |
148 /* objc attribute */ | |
149 static void objc_decl_method_attributes (tree*, tree, int); | |
150 static tree build_keyword_selector (tree); | |
151 | |
152 static void hash_init (void); | |
153 | |
154 /* Hash tables to manage the global pool of method prototypes. Each | |
155 of these maps map a method name (selector) identifier to either a | |
156 single tree (for methods with a single method prototype) or a | |
157 TREE_VEC (for methods with multiple method prototypes). */ | |
158 static GTY(()) objc_map_t instance_method_map = 0; | |
159 static GTY(()) objc_map_t class_method_map = 0; | |
160 | |
161 /* Hash tables to manage the global pool of class names. */ | |
162 | |
163 static GTY(()) objc_map_t class_name_map = 0; | |
164 static GTY(()) objc_map_t alias_name_map = 0; | |
165 | |
166 static tree lookup_method (tree, tree); | |
167 static tree lookup_method_static (tree, tree, int); | |
168 | |
169 static void interface_hash_init (void); | |
170 static tree add_interface (tree, tree); | |
171 static void add_category (tree, tree); | |
172 static inline tree lookup_category (tree, tree); | |
173 | |
174 /* Protocols. */ | |
175 | |
176 static tree lookup_protocol (tree, bool, bool); | |
177 static tree lookup_and_install_protocols (tree, bool); | |
178 | |
179 #ifdef OBJCPLUS | |
180 static void really_start_method (tree, tree); | |
181 #else | |
182 static void really_start_method (tree, struct c_arg_info *); | |
183 #endif | |
184 static int comp_proto_with_proto (tree, tree, int); | |
185 static tree objc_decay_parm_type (tree); | |
186 | |
187 /* Utilities for debugging and error diagnostics. */ | |
188 | |
189 static char *gen_type_name (tree); | |
190 static char *gen_type_name_0 (tree); | |
191 static char *gen_method_decl (tree); | |
192 static char *gen_declaration (tree); | |
193 | |
194 /* Everything else. */ | |
195 | |
196 static void generate_struct_by_value_array (void) ATTRIBUTE_NORETURN; | |
197 | |
198 static void mark_referenced_methods (void); | |
199 static bool objc_type_valid_for_messaging (tree type, bool allow_classes); | |
200 static tree check_duplicates (tree, int, int); | |
201 | |
202 /*** Private Interface (data) ***/ | |
203 /* Flags for lookup_method_static(). */ | |
204 | |
205 /* Look for class methods. */ | |
206 #define OBJC_LOOKUP_CLASS 1 | |
207 /* Do not examine superclasses. */ | |
208 #define OBJC_LOOKUP_NO_SUPER 2 | |
209 /* Disable returning an instance method of a root class when a class | |
210 method can't be found. */ | |
211 #define OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS 4 | |
212 | |
213 /* The OCTI_... enumeration itself is in objc/objc-act.h. */ | |
214 tree objc_global_trees[OCTI_MAX]; | |
215 | |
216 struct imp_entry *imp_list = 0; | |
217 int imp_count = 0; /* `@implementation' */ | |
218 int cat_count = 0; /* `@category' */ | |
219 | |
220 objc_ivar_visibility_kind objc_ivar_visibility, objc_default_ivar_visibility; | |
221 | |
222 /* Use to generate method labels. */ | |
223 static int method_slot = 0; | |
224 | |
225 /* Flag to say whether methods in a protocol are optional or | |
226 required. */ | |
227 static bool objc_method_optional_flag = false; | |
228 | |
229 static int objc_collecting_ivars = 0; | |
230 | |
231 /* Flag that is set to 'true' while we are processing a class | |
232 extension. Since a class extension just "reopens" the main | |
233 @interface, this can be used to determine if we are in the main | |
234 @interface, or in a class extension. */ | |
235 static bool objc_in_class_extension = false; | |
236 | |
237 static char *errbuf; /* Buffer for error diagnostics */ | |
238 | |
239 /* An array of all the local variables in the current function that | |
240 need to be marked as volatile. */ | |
241 vec<tree, va_gc> *local_variables_to_volatilize = NULL; | |
242 | |
243 /* Store all constructed constant strings in a hash table so that | |
244 they get uniqued properly. */ | |
245 | |
246 struct GTY((for_user)) string_descriptor { | |
247 /* The literal argument . */ | |
248 tree literal; | |
249 | |
250 /* The resulting constant string. */ | |
251 tree constructor; | |
252 }; | |
253 | |
254 struct objc_string_hasher : ggc_ptr_hash<string_descriptor> | |
255 { | |
256 static hashval_t hash (string_descriptor *); | |
257 static bool equal (string_descriptor *, string_descriptor *); | |
258 }; | |
259 | |
260 static GTY(()) hash_table<objc_string_hasher> *string_htab; | |
261 | |
262 FILE *gen_declaration_file; | |
263 | |
264 /* Hooks for stuff that differs between runtimes. */ | |
265 objc_runtime_hooks runtime; | |
266 | |
267 /* Create a temporary variable of type 'type'. If 'name' is set, uses | |
268 the specified name, else use no name. Returns the declaration of | |
269 the type. The 'name' is mostly useful for debugging. | |
270 */ | |
271 tree | |
272 objc_create_temporary_var (tree type, const char *name) | |
273 { | |
274 tree decl; | |
275 | |
276 if (name != NULL) | |
277 { | |
278 decl = build_decl (input_location, | |
279 VAR_DECL, get_identifier (name), type); | |
280 } | |
281 else | |
282 { | |
283 decl = build_decl (input_location, | |
284 VAR_DECL, NULL_TREE, type); | |
285 } | |
286 TREE_USED (decl) = 1; | |
287 DECL_ARTIFICIAL (decl) = 1; | |
288 DECL_IGNORED_P (decl) = 1; | |
289 DECL_CONTEXT (decl) = current_function_decl; | |
290 | |
291 return decl; | |
292 } | |
293 | |
294 /* Some platforms pass small structures through registers versus | |
295 through an invisible pointer. Determine at what size structure is | |
296 the transition point between the two possibilities. */ | |
297 | |
298 static void | |
299 generate_struct_by_value_array (void) | |
300 { | |
301 tree type; | |
302 tree decls; | |
303 int i, j; | |
304 int aggregate_in_mem[32]; | |
305 int found = 0; | |
306 | |
307 /* Presumably no platform passes 32 byte structures in a register. */ | |
308 /* ??? As an example, m64/ppc/Darwin can pass up to 8*long+13*double | |
309 in registers. */ | |
310 for (i = 1; i < 32; i++) | |
311 { | |
312 char buffer[5]; | |
313 tree *chain = NULL; | |
314 | |
315 /* Create an unnamed struct that has `i' character components */ | |
316 type = objc_start_struct (NULL_TREE); | |
317 | |
318 strcpy (buffer, "c1"); | |
319 decls = add_field_decl (char_type_node, buffer, &chain); | |
320 | |
321 for (j = 1; j < i; j++) | |
322 { | |
323 sprintf (buffer, "c%d", j + 1); | |
324 add_field_decl (char_type_node, buffer, &chain); | |
325 } | |
326 objc_finish_struct (type, decls); | |
327 | |
328 aggregate_in_mem[i] = aggregate_value_p (type, 0); | |
329 if (!aggregate_in_mem[i]) | |
330 found = 1; | |
331 } | |
332 | |
333 /* We found some structures that are returned in registers instead of memory | |
334 so output the necessary data. */ | |
335 if (found) | |
336 { | |
337 for (i = 31; i >= 0; i--) | |
338 if (!aggregate_in_mem[i]) | |
339 break; | |
340 printf ("#define OBJC_MAX_STRUCT_BY_VALUE %d\n", i); | |
341 } | |
342 | |
343 exit (0); | |
344 } | |
345 | |
346 bool | |
347 objc_init (void) | |
348 { | |
349 bool ok; | |
350 #ifdef OBJCPLUS | |
351 if (cxx_init () == false) | |
352 #else | |
353 if (c_objc_common_init () == false) | |
354 #endif | |
355 return false; | |
356 | |
357 /* print_struct_values is triggered by -print-runtime-info (used | |
358 when building libobjc, with an empty file as input). It does not | |
359 require any ObjC setup, and it never returns. | |
360 | |
361 -fcompare-debug is used to check the compiler output; we are | |
362 executed twice, once with flag_compare_debug set, and once with | |
363 it not set. If the flag is used together with | |
364 -print-runtime-info, we want to print the runtime info only once, | |
365 else it would be output in duplicate. So we check | |
366 flag_compare_debug to output it in only one of the invocations. | |
367 | |
368 As a side effect, this also that means -fcompare-debug | |
369 -print-runtime-info will run the compiler twice, and compare the | |
370 generated assembler file; the first time the compiler exits | |
371 immediately (producing no file), and the second time it compiles | |
372 an empty file. This checks, as a side effect, that compiling an | |
373 empty file produces no assembler output. */ | |
374 if (print_struct_values && !flag_compare_debug) | |
375 generate_struct_by_value_array (); | |
376 | |
377 /* Set up stuff used by FE parser and all runtimes. */ | |
378 errbuf = XNEWVEC (char, 1024 * 10); | |
379 interface_hash_init (); | |
380 hash_init (); | |
381 objc_encoding_init (); | |
382 /* ... and then check flags and set-up for the selected runtime ... */ | |
383 if (flag_next_runtime && flag_objc_abi >= 2) | |
384 ok = objc_next_runtime_abi_02_init (&runtime); | |
385 else if (flag_next_runtime) | |
386 ok = objc_next_runtime_abi_01_init (&runtime); | |
387 else | |
388 ok = objc_gnu_runtime_abi_01_init (&runtime); | |
389 | |
390 /* If that part of the setup failed - bail out immediately. */ | |
391 if (!ok) | |
392 return false; | |
393 | |
394 /* Determine the default visibility for instance variables. */ | |
395 switch (default_ivar_visibility) | |
396 { | |
397 case IVAR_VISIBILITY_PRIVATE: | |
398 objc_default_ivar_visibility = OBJC_IVAR_VIS_PRIVATE; | |
399 break; | |
400 case IVAR_VISIBILITY_PUBLIC: | |
401 objc_default_ivar_visibility = OBJC_IVAR_VIS_PUBLIC; | |
402 break; | |
403 case IVAR_VISIBILITY_PACKAGE: | |
404 objc_default_ivar_visibility = OBJC_IVAR_VIS_PACKAGE; | |
405 break; | |
406 default: | |
407 objc_default_ivar_visibility = OBJC_IVAR_VIS_PROTECTED; | |
408 } | |
409 | |
410 /* Generate general types and push runtime-specific decls to file scope. */ | |
411 synth_module_prologue (); | |
412 | |
413 return true; | |
414 } | |
415 | |
416 /* This is called at the end of parsing by the C/C++ parsers. */ | |
417 void | |
418 objc_write_global_declarations (void) | |
419 { | |
420 mark_referenced_methods (); | |
421 | |
422 /* A missing @end might not be detected by the parser. */ | |
423 if (objc_implementation_context) | |
424 { | |
425 warning (0, "%<@end%> missing in implementation context"); | |
426 finish_class (objc_implementation_context); | |
427 objc_ivar_chain = NULL_TREE; | |
428 objc_implementation_context = NULL_TREE; | |
429 } | |
430 | |
431 if (warn_selector) | |
432 { | |
433 objc_map_iterator_t i; | |
434 | |
435 objc_map_iterator_initialize (class_method_map, &i); | |
436 while (objc_map_iterator_move_to_next (class_method_map, &i)) | |
437 check_duplicates (objc_map_iterator_current_value (class_method_map, i), 0, 1); | |
438 | |
439 objc_map_iterator_initialize (instance_method_map, &i); | |
440 while (objc_map_iterator_move_to_next (instance_method_map, &i)) | |
441 check_duplicates (objc_map_iterator_current_value (instance_method_map, i), 0, 0); | |
442 } | |
443 | |
444 /* TODO: consider an early exit here if either errorcount or sorrycount | |
445 is non-zero. Not only is it wasting time to generate the metadata, | |
446 it needlessly imposes need to re-check for things that are already | |
447 determined to be errors. */ | |
448 | |
449 /* Finalize Objective-C runtime data. No need to generate tables | |
450 and code if only checking syntax, or if generating a PCH file. */ | |
451 if (!flag_syntax_only && !pch_file) | |
452 { | |
453 location_t saved_location; | |
454 | |
455 /* If gen_declaration desired, open the output file. */ | |
456 if (flag_gen_declaration) | |
457 { | |
458 char * const dumpname = concat (dump_base_name, ".decl", NULL); | |
459 gen_declaration_file = fopen (dumpname, "w"); | |
460 if (gen_declaration_file == 0) | |
461 fatal_error (input_location, "can%'t open %s: %m", dumpname); | |
462 free (dumpname); | |
463 } | |
464 | |
465 /* Set the input location to BUILTINS_LOCATION. This is good | |
466 for error messages, in case any is generated while producing | |
467 the metadata, but it also silences warnings that would be | |
468 produced when compiling with -Wpadded in case when padding is | |
469 automatically added to the built-in runtime data structure | |
470 declarations. We know about this padding, and it is fine; we | |
471 don't want users to see any warnings about it if they use | |
472 -Wpadded. */ | |
473 saved_location = input_location; | |
474 input_location = BUILTINS_LOCATION; | |
475 | |
476 /* Compute and emit the meta-data tables for this runtime. */ | |
477 (*runtime.generate_metadata) (); | |
478 | |
479 /* Restore the original location, just in case it mattered. */ | |
480 input_location = saved_location; | |
481 | |
482 /* ... and then close any declaration file we opened. */ | |
483 if (gen_declaration_file) | |
484 fclose (gen_declaration_file); | |
485 } | |
486 } | |
487 | |
488 /* Return the first occurrence of a method declaration corresponding | |
489 to sel_name in rproto_list. Search rproto_list recursively. | |
490 If is_class is 0, search for instance methods, otherwise for class | |
491 methods. */ | |
492 static tree | |
493 lookup_method_in_protocol_list (tree rproto_list, tree sel_name, | |
494 int is_class) | |
495 { | |
496 tree rproto, p, m; | |
497 | |
498 for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) | |
499 { | |
500 p = TREE_VALUE (rproto); | |
501 m = NULL_TREE; | |
502 | |
503 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) | |
504 { | |
505 /* First, search the @required protocol methods. */ | |
506 if (is_class) | |
507 m = lookup_method (PROTOCOL_CLS_METHODS (p), sel_name); | |
508 else | |
509 m = lookup_method (PROTOCOL_NST_METHODS (p), sel_name); | |
510 | |
511 if (m) | |
512 return m; | |
513 | |
514 /* If still not found, search the @optional protocol methods. */ | |
515 if (is_class) | |
516 m = lookup_method (PROTOCOL_OPTIONAL_CLS_METHODS (p), sel_name); | |
517 else | |
518 m = lookup_method (PROTOCOL_OPTIONAL_NST_METHODS (p), sel_name); | |
519 | |
520 if (m) | |
521 return m; | |
522 | |
523 /* If still not found, search the attached protocols. */ | |
524 if (PROTOCOL_LIST (p)) | |
525 m = lookup_method_in_protocol_list (PROTOCOL_LIST (p), | |
526 sel_name, is_class); | |
527 if (m) | |
528 return m; | |
529 } | |
530 else | |
531 { | |
532 ; /* An identifier...if we could not find a protocol. */ | |
533 } | |
534 } | |
535 | |
536 return 0; | |
537 } | |
538 | |
539 static tree | |
540 lookup_protocol_in_reflist (tree rproto_list, tree lproto) | |
541 { | |
542 tree rproto, p; | |
543 | |
544 /* Make sure the protocol is supported by the object on the rhs. */ | |
545 if (TREE_CODE (lproto) == PROTOCOL_INTERFACE_TYPE) | |
546 { | |
547 tree fnd = 0; | |
548 for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) | |
549 { | |
550 p = TREE_VALUE (rproto); | |
551 | |
552 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) | |
553 { | |
554 if (lproto == p) | |
555 fnd = lproto; | |
556 | |
557 else if (PROTOCOL_LIST (p)) | |
558 fnd = lookup_protocol_in_reflist (PROTOCOL_LIST (p), lproto); | |
559 } | |
560 | |
561 if (fnd) | |
562 return fnd; | |
563 } | |
564 } | |
565 else | |
566 { | |
567 ; /* An identifier...if we could not find a protocol. */ | |
568 } | |
569 | |
570 return 0; | |
571 } | |
572 | |
573 void | |
574 objc_start_class_interface (tree klass, tree super_class, | |
575 tree protos, tree attributes) | |
576 { | |
577 if (flag_objc1_only && attributes) | |
578 error_at (input_location, "class attributes are not available in Objective-C 1.0"); | |
579 | |
580 objc_interface_context | |
581 = objc_ivar_context | |
582 = start_class (CLASS_INTERFACE_TYPE, klass, super_class, protos, attributes); | |
583 objc_ivar_visibility = objc_default_ivar_visibility; | |
584 } | |
585 | |
586 void | |
587 objc_start_category_interface (tree klass, tree categ, | |
588 tree protos, tree attributes) | |
589 { | |
590 if (attributes) | |
591 { | |
592 if (flag_objc1_only) | |
593 error_at (input_location, "category attributes are not available in Objective-C 1.0"); | |
594 else | |
595 warning_at (input_location, OPT_Wattributes, | |
596 "category attributes are not available in this version" | |
597 " of the compiler, (ignored)"); | |
598 } | |
599 if (categ == NULL_TREE) | |
600 { | |
601 if (flag_objc1_only) | |
602 error_at (input_location, "class extensions are not available in Objective-C 1.0"); | |
603 else | |
604 { | |
605 /* Iterate over all the classes and categories implemented | |
606 up to now in this compilation unit. */ | |
607 struct imp_entry *t; | |
608 | |
609 for (t = imp_list; t; t = t->next) | |
610 { | |
611 /* If we find a class @implementation with the same name | |
612 as the one we are extending, produce an error. */ | |
613 if (TREE_CODE (t->imp_context) == CLASS_IMPLEMENTATION_TYPE | |
614 && IDENTIFIER_POINTER (CLASS_NAME (t->imp_context)) == IDENTIFIER_POINTER (klass)) | |
615 error_at (input_location, | |
616 "class extension for class %qE declared after its %<@implementation%>", | |
617 klass); | |
618 } | |
619 } | |
620 } | |
621 objc_interface_context | |
622 = start_class (CATEGORY_INTERFACE_TYPE, klass, categ, protos, NULL_TREE); | |
623 objc_ivar_chain | |
624 = continue_class (objc_interface_context); | |
625 } | |
626 | |
627 void | |
628 objc_start_protocol (tree name, tree protos, tree attributes) | |
629 { | |
630 if (flag_objc1_only && attributes) | |
631 error_at (input_location, "protocol attributes are not available in Objective-C 1.0"); | |
632 | |
633 objc_interface_context | |
634 = start_protocol (PROTOCOL_INTERFACE_TYPE, name, protos, attributes); | |
635 objc_method_optional_flag = false; | |
636 } | |
637 | |
638 void | |
639 objc_continue_interface (void) | |
640 { | |
641 objc_ivar_chain | |
642 = continue_class (objc_interface_context); | |
643 } | |
644 | |
645 void | |
646 objc_finish_interface (void) | |
647 { | |
648 finish_class (objc_interface_context); | |
649 objc_interface_context = NULL_TREE; | |
650 objc_method_optional_flag = false; | |
651 objc_in_class_extension = false; | |
652 } | |
653 | |
654 void | |
655 objc_start_class_implementation (tree klass, tree super_class) | |
656 { | |
657 objc_implementation_context | |
658 = objc_ivar_context | |
659 = start_class (CLASS_IMPLEMENTATION_TYPE, klass, super_class, NULL_TREE, | |
660 NULL_TREE); | |
661 objc_ivar_visibility = objc_default_ivar_visibility; | |
662 } | |
663 | |
664 void | |
665 objc_start_category_implementation (tree klass, tree categ) | |
666 { | |
667 objc_implementation_context | |
668 = start_class (CATEGORY_IMPLEMENTATION_TYPE, klass, categ, NULL_TREE, | |
669 NULL_TREE); | |
670 objc_ivar_chain | |
671 = continue_class (objc_implementation_context); | |
672 } | |
673 | |
674 void | |
675 objc_continue_implementation (void) | |
676 { | |
677 objc_ivar_chain | |
678 = continue_class (objc_implementation_context); | |
679 } | |
680 | |
681 void | |
682 objc_finish_implementation (void) | |
683 { | |
684 #ifdef OBJCPLUS | |
685 if (flag_objc_call_cxx_cdtors) | |
686 objc_generate_cxx_cdtors (); | |
687 #endif | |
688 | |
689 if (objc_implementation_context) | |
690 { | |
691 finish_class (objc_implementation_context); | |
692 objc_ivar_chain = NULL_TREE; | |
693 objc_implementation_context = NULL_TREE; | |
694 } | |
695 else | |
696 warning (0, "%<@end%> must appear in an @implementation context"); | |
697 } | |
698 | |
699 void | |
700 objc_set_visibility (objc_ivar_visibility_kind visibility) | |
701 { | |
702 if (visibility == OBJC_IVAR_VIS_PACKAGE) | |
703 { | |
704 if (flag_objc1_only) | |
705 error ("%<@package%> is not available in Objective-C 1.0"); | |
706 else | |
707 warning (0, "%<@package%> presently has the same effect as %<@public%>"); | |
708 } | |
709 objc_ivar_visibility = visibility; | |
710 } | |
711 | |
712 void | |
713 objc_set_method_opt (bool optional) | |
714 { | |
715 if (flag_objc1_only) | |
716 { | |
717 if (optional) | |
718 error_at (input_location, "%<@optional%> is not available in Objective-C 1.0"); | |
719 else | |
720 error_at (input_location, "%<@required%> is not available in Objective-C 1.0"); | |
721 } | |
722 | |
723 objc_method_optional_flag = optional; | |
724 if (!objc_interface_context | |
725 || TREE_CODE (objc_interface_context) != PROTOCOL_INTERFACE_TYPE) | |
726 { | |
727 if (optional) | |
728 error ("%<@optional%> is allowed in @protocol context only"); | |
729 else | |
730 error ("%<@required%> is allowed in @protocol context only"); | |
731 objc_method_optional_flag = false; | |
732 } | |
733 } | |
734 | |
735 /* This routine looks for a given PROPERTY in a list of CLASS, CATEGORY, or | |
736 PROTOCOL. */ | |
737 static tree | |
738 lookup_property_in_list (tree chain, tree property) | |
739 { | |
740 tree x; | |
741 for (x = CLASS_PROPERTY_DECL (chain); x; x = TREE_CHAIN (x)) | |
742 if (PROPERTY_NAME (x) == property) | |
743 return x; | |
744 return NULL_TREE; | |
745 } | |
746 | |
747 /* This routine looks for a given PROPERTY in the tree chain of RPROTO_LIST. */ | |
748 static tree lookup_property_in_protocol_list (tree rproto_list, tree property) | |
749 { | |
750 tree rproto, x; | |
751 for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) | |
752 { | |
753 tree p = TREE_VALUE (rproto); | |
754 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) | |
755 { | |
756 if ((x = lookup_property_in_list (p, property))) | |
757 return x; | |
758 if (PROTOCOL_LIST (p)) | |
759 return lookup_property_in_protocol_list (PROTOCOL_LIST (p), property); | |
760 } | |
761 else | |
762 { | |
763 ; /* An identifier...if we could not find a protocol. */ | |
764 } | |
765 } | |
766 return NULL_TREE; | |
767 } | |
768 | |
769 /* This routine looks up the PROPERTY in current INTERFACE, its categories and up the | |
770 chain of interface hierarchy. */ | |
771 static tree | |
772 lookup_property (tree interface_type, tree property) | |
773 { | |
774 tree inter = interface_type; | |
775 while (inter) | |
776 { | |
777 tree x, category; | |
778 if ((x = lookup_property_in_list (inter, property))) | |
779 return x; | |
780 /* Failing that, look for the property in each category of the class. */ | |
781 category = inter; | |
782 while ((category = CLASS_CATEGORY_LIST (category))) | |
783 { | |
784 if ((x = lookup_property_in_list (category, property))) | |
785 return x; | |
786 | |
787 /* When checking a category, also check the protocols | |
788 attached with the category itself. */ | |
789 if (CLASS_PROTOCOL_LIST (category) | |
790 && (x = lookup_property_in_protocol_list | |
791 (CLASS_PROTOCOL_LIST (category), property))) | |
792 return x; | |
793 } | |
794 | |
795 /* Failing to find in categories, look for property in protocol list. */ | |
796 if (CLASS_PROTOCOL_LIST (inter) | |
797 && (x = lookup_property_in_protocol_list | |
798 (CLASS_PROTOCOL_LIST (inter), property))) | |
799 return x; | |
800 | |
801 /* Failing that, climb up the inheritance hierarchy. */ | |
802 inter = lookup_interface (CLASS_SUPER_NAME (inter)); | |
803 } | |
804 return inter; | |
805 } | |
806 | |
807 /* This routine is called by the parser when a | |
808 @property... declaration is found. 'decl' is the declaration of | |
809 the property (type/identifier), and the other arguments represent | |
810 property attributes that may have been specified in the Objective-C | |
811 declaration. 'parsed_property_readonly' is 'true' if the attribute | |
812 'readonly' was specified, and 'false' if not; similarly for the | |
813 other bool parameters. 'parsed_property_getter_ident' is NULL_TREE | |
814 if the attribute 'getter' was not specified, and is the identifier | |
815 corresponding to the specified getter if it was; similarly for | |
816 'parsed_property_setter_ident'. */ | |
817 void | |
818 objc_add_property_declaration (location_t location, tree decl, | |
819 bool parsed_property_readonly, bool parsed_property_readwrite, | |
820 bool parsed_property_assign, bool parsed_property_retain, | |
821 bool parsed_property_copy, bool parsed_property_nonatomic, | |
822 tree parsed_property_getter_ident, tree parsed_property_setter_ident) | |
823 { | |
824 tree property_decl; | |
825 tree x; | |
826 /* 'property_readonly' and 'property_assign_semantics' are the final | |
827 attributes of the property after all parsed attributes have been | |
828 considered (eg, if we parsed no 'readonly' and no 'readwrite', ie | |
829 parsed_property_readonly = false and parsed_property_readwrite = | |
830 false, then property_readonly will be false because the default | |
831 is readwrite). */ | |
832 bool property_readonly = false; | |
833 objc_property_assign_semantics property_assign_semantics = OBJC_PROPERTY_ASSIGN; | |
834 bool property_extension_in_class_extension = false; | |
835 | |
836 if (flag_objc1_only) | |
837 error_at (input_location, "%<@property%> is not available in Objective-C 1.0"); | |
838 | |
839 if (parsed_property_readonly && parsed_property_readwrite) | |
840 { | |
841 error_at (location, "%<readonly%> attribute conflicts with %<readwrite%> attribute"); | |
842 /* In case of conflicting attributes (here and below), after | |
843 producing an error, we pick one of the attributes and keep | |
844 going. */ | |
845 property_readonly = false; | |
846 } | |
847 else | |
848 { | |
849 if (parsed_property_readonly) | |
850 property_readonly = true; | |
851 | |
852 if (parsed_property_readwrite) | |
853 property_readonly = false; | |
854 } | |
855 | |
856 if (parsed_property_readonly && parsed_property_setter_ident) | |
857 { | |
858 error_at (location, "%<readonly%> attribute conflicts with %<setter%> attribute"); | |
859 property_readonly = false; | |
860 } | |
861 | |
862 if (parsed_property_assign && parsed_property_retain) | |
863 { | |
864 error_at (location, "%<assign%> attribute conflicts with %<retain%> attribute"); | |
865 property_assign_semantics = OBJC_PROPERTY_RETAIN; | |
866 } | |
867 else if (parsed_property_assign && parsed_property_copy) | |
868 { | |
869 error_at (location, "%<assign%> attribute conflicts with %<copy%> attribute"); | |
870 property_assign_semantics = OBJC_PROPERTY_COPY; | |
871 } | |
872 else if (parsed_property_retain && parsed_property_copy) | |
873 { | |
874 error_at (location, "%<retain%> attribute conflicts with %<copy%> attribute"); | |
875 property_assign_semantics = OBJC_PROPERTY_COPY; | |
876 } | |
877 else | |
878 { | |
879 if (parsed_property_assign) | |
880 property_assign_semantics = OBJC_PROPERTY_ASSIGN; | |
881 | |
882 if (parsed_property_retain) | |
883 property_assign_semantics = OBJC_PROPERTY_RETAIN; | |
884 | |
885 if (parsed_property_copy) | |
886 property_assign_semantics = OBJC_PROPERTY_COPY; | |
887 } | |
888 | |
889 if (!objc_interface_context) | |
890 { | |
891 error_at (location, "property declaration not in @interface or @protocol context"); | |
892 return; | |
893 } | |
894 | |
895 /* At this point we know that we are either in an interface, a | |
896 category, or a protocol. */ | |
897 | |
898 /* We expect a FIELD_DECL from the parser. Make sure we didn't get | |
899 something else, as that would confuse the checks below. */ | |
900 if (TREE_CODE (decl) != FIELD_DECL) | |
901 { | |
902 error_at (location, "invalid property declaration"); | |
903 return; | |
904 } | |
905 | |
906 /* Do some spot-checks for the most obvious invalid types. */ | |
907 | |
908 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
909 { | |
910 error_at (location, "property can not be an array"); | |
911 return; | |
912 } | |
913 | |
914 /* The C++/ObjC++ parser seems to reject the ':' for a bitfield when | |
915 parsing, while the C/ObjC parser accepts it and gives us a | |
916 FIELD_DECL with a DECL_INITIAL set. So we use the DECL_INITIAL | |
917 to check for a bitfield when doing ObjC. */ | |
918 #ifndef OBJCPLUS | |
919 if (DECL_INITIAL (decl)) | |
920 { | |
921 /* A @property is not an actual variable, but it is a way to | |
922 describe a pair of accessor methods, so its type (which is | |
923 the type of the return value of the getter and the first | |
924 argument of the setter) can't be a bitfield (as return values | |
925 and arguments of functions can not be bitfields). The | |
926 underlying instance variable could be a bitfield, but that is | |
927 a different matter. */ | |
928 error_at (location, "property can not be a bit-field"); | |
929 return; | |
930 } | |
931 #endif | |
932 | |
933 /* TODO: Check that the property type is an Objective-C object or a | |
934 "POD". */ | |
935 | |
936 /* Implement -Wproperty-assign-default (which is enabled by default). */ | |
937 if (warn_property_assign_default | |
938 /* If garbage collection is not being used, then 'assign' is | |
939 valid for objects (and typically used for delegates) but it | |
940 is wrong in most cases (since most objects need to be | |
941 retained or copied in setters). Warn users when 'assign' is | |
942 used implicitly. */ | |
943 && property_assign_semantics == OBJC_PROPERTY_ASSIGN | |
944 /* Read-only properties are never assigned, so the assignment | |
945 semantics do not matter in that case. */ | |
946 && !property_readonly | |
947 && !flag_objc_gc) | |
948 { | |
949 /* Please note that it would make sense to default to 'assign' | |
950 for non-{Objective-C objects}, and to 'retain' for | |
951 Objective-C objects. But that would break compatibility with | |
952 other compilers. */ | |
953 if (!parsed_property_assign && !parsed_property_retain && !parsed_property_copy) | |
954 { | |
955 /* Use 'false' so we do not warn for Class objects. */ | |
956 if (objc_type_valid_for_messaging (TREE_TYPE (decl), false)) | |
957 { | |
958 warning_at (location, | |
959 0, | |
960 "object property %qD has no %<assign%>, %<retain%> or %<copy%> attribute; assuming %<assign%>", | |
961 decl); | |
962 inform (location, | |
963 "%<assign%> can be unsafe for Objective-C objects; please state explicitly if you need it"); | |
964 } | |
965 } | |
966 } | |
967 | |
968 if (property_assign_semantics == OBJC_PROPERTY_RETAIN | |
969 && !objc_type_valid_for_messaging (TREE_TYPE (decl), true)) | |
970 error_at (location, "%<retain%> attribute is only valid for Objective-C objects"); | |
971 | |
972 if (property_assign_semantics == OBJC_PROPERTY_COPY | |
973 && !objc_type_valid_for_messaging (TREE_TYPE (decl), true)) | |
974 error_at (location, "%<copy%> attribute is only valid for Objective-C objects"); | |
975 | |
976 /* Now determine the final property getter and setter names. They | |
977 will be stored in the PROPERTY_DECL, from which they'll always be | |
978 extracted and used. */ | |
979 | |
980 /* Adjust, or fill in, setter and getter names. We overwrite the | |
981 parsed_property_setter_ident and parsed_property_getter_ident | |
982 with the final setter and getter identifiers that will be | |
983 used. */ | |
984 if (parsed_property_setter_ident) | |
985 { | |
986 /* The setter should be terminated by ':', but the parser only | |
987 gives us an identifier without ':'. So, we need to add ':' | |
988 at the end. */ | |
989 const char *parsed_setter = IDENTIFIER_POINTER (parsed_property_setter_ident); | |
990 size_t length = strlen (parsed_setter); | |
991 char *final_setter = (char *)alloca (length + 2); | |
992 | |
993 sprintf (final_setter, "%s:", parsed_setter); | |
994 parsed_property_setter_ident = get_identifier (final_setter); | |
995 } | |
996 else | |
997 { | |
998 if (!property_readonly) | |
999 parsed_property_setter_ident = get_identifier (objc_build_property_setter_name | |
1000 (DECL_NAME (decl))); | |
1001 } | |
1002 | |
1003 if (!parsed_property_getter_ident) | |
1004 parsed_property_getter_ident = DECL_NAME (decl); | |
1005 | |
1006 /* Check for duplicate property declarations. We first check the | |
1007 immediate context for a property with the same name. Any such | |
1008 declarations are an error, unless this is a class extension and | |
1009 we are extending a property from readonly to readwrite. */ | |
1010 for (x = CLASS_PROPERTY_DECL (objc_interface_context); x; x = TREE_CHAIN (x)) | |
1011 { | |
1012 if (PROPERTY_NAME (x) == DECL_NAME (decl)) | |
1013 { | |
1014 if (objc_in_class_extension | |
1015 && property_readonly == 0 | |
1016 && PROPERTY_READONLY (x) == 1) | |
1017 { | |
1018 /* This is a class extension, and we are extending an | |
1019 existing readonly property to a readwrite one. | |
1020 That's fine. :-) */ | |
1021 property_extension_in_class_extension = true; | |
1022 break; | |
1023 } | |
1024 else | |
1025 { | |
1026 location_t original_location = DECL_SOURCE_LOCATION (x); | |
1027 | |
1028 error_at (location, "redeclaration of property %qD", decl); | |
1029 | |
1030 if (original_location != UNKNOWN_LOCATION) | |
1031 inform (original_location, "originally specified here"); | |
1032 return; | |
1033 } | |
1034 } | |
1035 } | |
1036 | |
1037 /* If x is not NULL_TREE, we must be in a class extension and we're | |
1038 extending a readonly property. In that case, no point in | |
1039 searching for another declaration. */ | |
1040 if (x == NULL_TREE) | |
1041 { | |
1042 /* We now need to check for existing property declarations (in | |
1043 the superclass, other categories or protocols) and check that | |
1044 the new declaration is not in conflict with existing | |
1045 ones. */ | |
1046 | |
1047 /* Search for a previous, existing declaration of a property | |
1048 with the same name in superclasses, protocols etc. If one is | |
1049 found, it will be in the 'x' variable. */ | |
1050 | |
1051 /* Note that, for simplicity, the following may search again the | |
1052 local context. That's Ok as nothing will be found (else we'd | |
1053 have thrown an error above); it's only a little inefficient, | |
1054 but the code is simpler. */ | |
1055 switch (TREE_CODE (objc_interface_context)) | |
1056 { | |
1057 case CLASS_INTERFACE_TYPE: | |
1058 /* Look up the property in the current @interface (which | |
1059 will find nothing), then its protocols and categories and | |
1060 superclasses. */ | |
1061 x = lookup_property (objc_interface_context, DECL_NAME (decl)); | |
1062 break; | |
1063 case CATEGORY_INTERFACE_TYPE: | |
1064 /* Look up the property in the main @interface, then | |
1065 protocols and categories (one of them is ours, and will | |
1066 find nothing) and superclasses. */ | |
1067 x = lookup_property (lookup_interface (CLASS_NAME (objc_interface_context)), | |
1068 DECL_NAME (decl)); | |
1069 break; | |
1070 case PROTOCOL_INTERFACE_TYPE: | |
1071 /* Looks up the property in any protocols attached to the | |
1072 current protocol. */ | |
1073 if (PROTOCOL_LIST (objc_interface_context)) | |
1074 { | |
1075 x = lookup_property_in_protocol_list (PROTOCOL_LIST (objc_interface_context), | |
1076 DECL_NAME (decl)); | |
1077 } | |
1078 break; | |
1079 default: | |
1080 gcc_unreachable (); | |
1081 } | |
1082 } | |
1083 | |
1084 if (x != NULL_TREE) | |
1085 { | |
1086 /* An existing property was found; check that it has the same | |
1087 types, or it is compatible. */ | |
1088 location_t original_location = DECL_SOURCE_LOCATION (x); | |
1089 | |
1090 if (PROPERTY_NONATOMIC (x) != parsed_property_nonatomic) | |
1091 { | |
1092 warning_at (location, 0, | |
1093 "'nonatomic' attribute of property %qD conflicts with previous declaration", decl); | |
1094 | |
1095 if (original_location != UNKNOWN_LOCATION) | |
1096 inform (original_location, "originally specified here"); | |
1097 return; | |
1098 } | |
1099 | |
1100 if (PROPERTY_GETTER_NAME (x) != parsed_property_getter_ident) | |
1101 { | |
1102 warning_at (location, 0, | |
1103 "'getter' attribute of property %qD conflicts with previous declaration", decl); | |
1104 | |
1105 if (original_location != UNKNOWN_LOCATION) | |
1106 inform (original_location, "originally specified here"); | |
1107 return; | |
1108 } | |
1109 | |
1110 /* We can only compare the setter names if both the old and new property have a setter. */ | |
1111 if (!property_readonly && !PROPERTY_READONLY(x)) | |
1112 { | |
1113 if (PROPERTY_SETTER_NAME (x) != parsed_property_setter_ident) | |
1114 { | |
1115 warning_at (location, 0, | |
1116 "'setter' attribute of property %qD conflicts with previous declaration", decl); | |
1117 | |
1118 if (original_location != UNKNOWN_LOCATION) | |
1119 inform (original_location, "originally specified here"); | |
1120 return; | |
1121 } | |
1122 } | |
1123 | |
1124 if (PROPERTY_ASSIGN_SEMANTICS (x) != property_assign_semantics) | |
1125 { | |
1126 warning_at (location, 0, | |
1127 "assign semantics attributes of property %qD conflict with previous declaration", decl); | |
1128 | |
1129 if (original_location != UNKNOWN_LOCATION) | |
1130 inform (original_location, "originally specified here"); | |
1131 return; | |
1132 } | |
1133 | |
1134 /* It's ok to have a readonly property that becomes a readwrite, but not vice versa. */ | |
1135 if (PROPERTY_READONLY (x) == 0 && property_readonly == 1) | |
1136 { | |
1137 warning_at (location, 0, | |
1138 "'readonly' attribute of property %qD conflicts with previous declaration", decl); | |
1139 | |
1140 if (original_location != UNKNOWN_LOCATION) | |
1141 inform (original_location, "originally specified here"); | |
1142 return; | |
1143 } | |
1144 | |
1145 /* We now check that the new and old property declarations have | |
1146 the same types (or compatible one). In the Objective-C | |
1147 tradition of loose type checking, we do type-checking but | |
1148 only generate warnings (not errors) if they do not match. | |
1149 For non-readonly properties, the types must match exactly; | |
1150 for readonly properties, it is allowed to use a "more | |
1151 specialized" type in the new property declaration. Eg, the | |
1152 superclass has a getter returning (NSArray *) and the | |
1153 subclass a getter returning (NSMutableArray *). The object's | |
1154 getter returns an (NSMutableArray *); but if you cast the | |
1155 object to the superclass, which is allowed, you'd still | |
1156 expect the getter to return an (NSArray *), which works since | |
1157 an (NSMutableArray *) is an (NSArray *) too. So, the set of | |
1158 objects belonging to the type of the new @property should be | |
1159 a subset of the set of objects belonging to the type of the | |
1160 old @property. This is what "specialization" means. And the | |
1161 reason it only applies to readonly properties is that for a | |
1162 readwrite property the setter would have the opposite | |
1163 requirement - ie that the superclass type is more specialized | |
1164 then the subclass one; hence the only way to satisfy both | |
1165 constraints is that the types match. */ | |
1166 | |
1167 /* If the types are not the same in the C sense, we warn ... */ | |
1168 if (!comptypes (TREE_TYPE (x), TREE_TYPE (decl)) | |
1169 /* ... unless the property is readonly, in which case we | |
1170 allow a new, more specialized, declaration. */ | |
1171 && (!property_readonly | |
1172 || !objc_compare_types (TREE_TYPE (x), | |
1173 TREE_TYPE (decl), -5, NULL_TREE))) | |
1174 { | |
1175 warning_at (location, 0, | |
1176 "type of property %qD conflicts with previous declaration", decl); | |
1177 if (original_location != UNKNOWN_LOCATION) | |
1178 inform (original_location, "originally specified here"); | |
1179 return; | |
1180 } | |
1181 | |
1182 /* If we are in a class extension and we're extending a readonly | |
1183 property in the main @interface, we'll just update the | |
1184 existing property with the readwrite flag and potentially the | |
1185 new setter name. */ | |
1186 if (property_extension_in_class_extension) | |
1187 { | |
1188 PROPERTY_READONLY (x) = 0; | |
1189 PROPERTY_SETTER_NAME (x) = parsed_property_setter_ident; | |
1190 return; | |
1191 } | |
1192 } | |
1193 | |
1194 /* Create a PROPERTY_DECL node. */ | |
1195 property_decl = make_node (PROPERTY_DECL); | |
1196 | |
1197 /* Copy the basic information from the original decl. */ | |
1198 TREE_TYPE (property_decl) = TREE_TYPE (decl); | |
1199 DECL_SOURCE_LOCATION (property_decl) = DECL_SOURCE_LOCATION (decl); | |
1200 TREE_DEPRECATED (property_decl) = TREE_DEPRECATED (decl); | |
1201 | |
1202 /* Add property-specific information. */ | |
1203 PROPERTY_NAME (property_decl) = DECL_NAME (decl); | |
1204 PROPERTY_GETTER_NAME (property_decl) = parsed_property_getter_ident; | |
1205 PROPERTY_SETTER_NAME (property_decl) = parsed_property_setter_ident; | |
1206 PROPERTY_READONLY (property_decl) = property_readonly; | |
1207 PROPERTY_NONATOMIC (property_decl) = parsed_property_nonatomic; | |
1208 PROPERTY_ASSIGN_SEMANTICS (property_decl) = property_assign_semantics; | |
1209 PROPERTY_IVAR_NAME (property_decl) = NULL_TREE; | |
1210 PROPERTY_DYNAMIC (property_decl) = 0; | |
1211 | |
1212 /* Remember the fact that the property was found in the @optional | |
1213 section in a @protocol, or not. */ | |
1214 if (objc_method_optional_flag) | |
1215 PROPERTY_OPTIONAL (property_decl) = 1; | |
1216 else | |
1217 PROPERTY_OPTIONAL (property_decl) = 0; | |
1218 | |
1219 /* Note that PROPERTY_GETTER_NAME is always set for all | |
1220 PROPERTY_DECLs, and PROPERTY_SETTER_NAME is always set for all | |
1221 PROPERTY_DECLs where PROPERTY_READONLY == 0. Any time we deal | |
1222 with a getter or setter, we should get the PROPERTY_DECL and use | |
1223 PROPERTY_GETTER_NAME and PROPERTY_SETTER_NAME to know the correct | |
1224 names. */ | |
1225 | |
1226 /* Add the PROPERTY_DECL to the list of properties for the class. */ | |
1227 TREE_CHAIN (property_decl) = CLASS_PROPERTY_DECL (objc_interface_context); | |
1228 CLASS_PROPERTY_DECL (objc_interface_context) = property_decl; | |
1229 } | |
1230 | |
1231 /* This is a subroutine of objc_maybe_build_component_ref. Search the | |
1232 list of methods in the interface (and, failing that, the local list | |
1233 in the implementation, and failing that, the protocol list) | |
1234 provided for a 'setter' or 'getter' for 'component' with default | |
1235 names (ie, if 'component' is "name", then search for "name" and | |
1236 "setName:"). It is also possible to specify a different | |
1237 'getter_name' (this is used for @optional readonly properties). If | |
1238 any is found, then create an artificial property that uses them. | |
1239 Return NULL_TREE if 'getter' or 'setter' could not be found. */ | |
1240 static tree | |
1241 maybe_make_artificial_property_decl (tree interface, tree implementation, | |
1242 tree protocol_list, tree component, bool is_class, | |
1243 tree getter_name) | |
1244 { | |
1245 tree setter_name = get_identifier (objc_build_property_setter_name (component)); | |
1246 tree getter = NULL_TREE; | |
1247 tree setter = NULL_TREE; | |
1248 | |
1249 if (getter_name == NULL_TREE) | |
1250 getter_name = component; | |
1251 | |
1252 /* First, check the @interface and all superclasses. */ | |
1253 if (interface) | |
1254 { | |
1255 int flags = 0; | |
1256 | |
1257 /* Using instance methods of the root class as accessors is most | |
1258 likely unwanted and can be extremely confusing (and, most | |
1259 importantly, other Objective-C 2.0 compilers do not do it). | |
1260 Turn it off. */ | |
1261 if (is_class) | |
1262 flags = OBJC_LOOKUP_CLASS | OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS; | |
1263 | |
1264 getter = lookup_method_static (interface, getter_name, flags); | |
1265 setter = lookup_method_static (interface, setter_name, flags); | |
1266 } | |
1267 | |
1268 /* Second, check the local @implementation context. */ | |
1269 if (!getter && !setter) | |
1270 { | |
1271 if (implementation) | |
1272 { | |
1273 if (is_class) | |
1274 { | |
1275 getter = lookup_method (CLASS_CLS_METHODS (implementation), getter_name); | |
1276 setter = lookup_method (CLASS_CLS_METHODS (implementation), setter_name); | |
1277 } | |
1278 else | |
1279 { | |
1280 getter = lookup_method (CLASS_NST_METHODS (implementation), getter_name); | |
1281 setter = lookup_method (CLASS_NST_METHODS (implementation), setter_name); | |
1282 } | |
1283 } | |
1284 } | |
1285 | |
1286 /* Try the protocol_list if we didn't find anything in the | |
1287 @interface and in the @implementation. */ | |
1288 if (!getter && !setter) | |
1289 { | |
1290 getter = lookup_method_in_protocol_list (protocol_list, getter_name, is_class); | |
1291 setter = lookup_method_in_protocol_list (protocol_list, setter_name, is_class); | |
1292 } | |
1293 | |
1294 /* There needs to be at least a getter or setter for this to be a | |
1295 valid 'object.component' syntax. */ | |
1296 if (getter || setter) | |
1297 { | |
1298 /* Yes ... determine the type of the expression. */ | |
1299 tree property_decl; | |
1300 tree type; | |
1301 | |
1302 if (getter) | |
1303 type = TREE_VALUE (TREE_TYPE (getter)); | |
1304 else | |
1305 type = TREE_VALUE (TREE_TYPE (METHOD_SEL_ARGS (setter))); | |
1306 | |
1307 /* Create an artificial property declaration with the | |
1308 information we collected on the type and getter/setter | |
1309 names. */ | |
1310 property_decl = make_node (PROPERTY_DECL); | |
1311 | |
1312 TREE_TYPE (property_decl) = type; | |
1313 DECL_SOURCE_LOCATION (property_decl) = input_location; | |
1314 TREE_DEPRECATED (property_decl) = 0; | |
1315 DECL_ARTIFICIAL (property_decl) = 1; | |
1316 | |
1317 /* Add property-specific information. Note that one of | |
1318 PROPERTY_GETTER_NAME or PROPERTY_SETTER_NAME may refer to a | |
1319 non-existing method; this will generate an error when the | |
1320 expression is later compiled. At this stage we don't know if | |
1321 the getter or setter will be used, so we can't generate an | |
1322 error. */ | |
1323 PROPERTY_NAME (property_decl) = component; | |
1324 PROPERTY_GETTER_NAME (property_decl) = getter_name; | |
1325 PROPERTY_SETTER_NAME (property_decl) = setter_name; | |
1326 PROPERTY_READONLY (property_decl) = 0; | |
1327 PROPERTY_NONATOMIC (property_decl) = 0; | |
1328 PROPERTY_ASSIGN_SEMANTICS (property_decl) = 0; | |
1329 PROPERTY_IVAR_NAME (property_decl) = NULL_TREE; | |
1330 PROPERTY_DYNAMIC (property_decl) = 0; | |
1331 PROPERTY_OPTIONAL (property_decl) = 0; | |
1332 | |
1333 if (!getter) | |
1334 PROPERTY_HAS_NO_GETTER (property_decl) = 1; | |
1335 | |
1336 /* The following is currently unused, but it's nice to have | |
1337 there. We may use it if we need in the future. */ | |
1338 if (!setter) | |
1339 PROPERTY_HAS_NO_SETTER (property_decl) = 1; | |
1340 | |
1341 return property_decl; | |
1342 } | |
1343 | |
1344 return NULL_TREE; | |
1345 } | |
1346 | |
1347 /* This hook routine is invoked by the parser when an expression such | |
1348 as 'xxx.yyy' is parsed. We get a chance to process these | |
1349 expressions in a way that is specified to Objective-C (to implement | |
1350 the Objective-C 2.0 dot-syntax, properties, or non-fragile ivars). | |
1351 If the expression is not an Objective-C specified expression, we | |
1352 should return NULL_TREE; else we return the expression. | |
1353 | |
1354 At the moment this only implements dot-syntax and properties (not | |
1355 non-fragile ivars yet), ie 'object.property' or 'object.component' | |
1356 where 'component' is not a declared property, but a valid getter or | |
1357 setter for it could be found. */ | |
1358 tree | |
1359 objc_maybe_build_component_ref (tree object, tree property_ident) | |
1360 { | |
1361 tree x = NULL_TREE; | |
1362 tree rtype; | |
1363 | |
1364 /* If we are in Objective-C 1.0 mode, dot-syntax and properties are | |
1365 not available. */ | |
1366 if (flag_objc1_only) | |
1367 return NULL_TREE; | |
1368 | |
1369 /* Try to determine if 'object' is an Objective-C object or not. If | |
1370 not, return. */ | |
1371 if (object == NULL_TREE || object == error_mark_node | |
1372 || (rtype = TREE_TYPE (object)) == NULL_TREE) | |
1373 return NULL_TREE; | |
1374 | |
1375 if (property_ident == NULL_TREE || property_ident == error_mark_node | |
1376 || TREE_CODE (property_ident) != IDENTIFIER_NODE) | |
1377 return NULL_TREE; | |
1378 | |
1379 /* The following analysis of 'object' is similar to the one used for | |
1380 the 'receiver' of a method invocation. We need to determine what | |
1381 'object' is and find the appropriate property (either declared, | |
1382 or artificial) for it (in the same way as we need to find the | |
1383 appropriate method prototype for a method invocation). There are | |
1384 some simplifications here though: "object.property" is invalid if | |
1385 "object" has a type of "id" or "Class"; it must at least have a | |
1386 protocol attached to it, and "object" is never a class name as | |
1387 that is done by objc_build_class_component_ref. Finally, we | |
1388 don't know if this really is a dot-syntax expression, so we want | |
1389 to make a quick exit if it is not; for this reason, we try to | |
1390 postpone checks after determining that 'object' looks like an | |
1391 Objective-C object. */ | |
1392 | |
1393 if (objc_is_id (rtype)) | |
1394 { | |
1395 /* This is the case that the 'object' is of type 'id' or | |
1396 'Class'. */ | |
1397 | |
1398 /* Check if at least it is of type 'id <Protocol>' or 'Class | |
1399 <Protocol>'; if so, look the property up in the | |
1400 protocols. */ | |
1401 if (TYPE_HAS_OBJC_INFO (TREE_TYPE (rtype))) | |
1402 { | |
1403 tree rprotos = TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (rtype)); | |
1404 | |
1405 if (rprotos) | |
1406 { | |
1407 /* No point looking up declared @properties if we are | |
1408 dealing with a class. Classes have no declared | |
1409 properties. */ | |
1410 if (!IS_CLASS (rtype)) | |
1411 x = lookup_property_in_protocol_list (rprotos, property_ident); | |
1412 | |
1413 if (x == NULL_TREE) | |
1414 { | |
1415 /* Ok, no property. Maybe it was an | |
1416 object.component dot-syntax without a declared | |
1417 property (this is valid for classes too). Look | |
1418 for getter/setter methods and internally declare | |
1419 an artificial property based on them if found. */ | |
1420 x = maybe_make_artificial_property_decl (NULL_TREE, | |
1421 NULL_TREE, | |
1422 rprotos, | |
1423 property_ident, | |
1424 IS_CLASS (rtype), | |
1425 NULL_TREE); | |
1426 } | |
1427 else if (PROPERTY_OPTIONAL (x) && PROPERTY_READONLY (x)) | |
1428 { | |
1429 /* This is a special, complicated case. If the | |
1430 property is optional, and is read-only, then the | |
1431 property is always used for reading, but an | |
1432 eventual existing non-property setter can be used | |
1433 for writing. We create an artificial property | |
1434 decl copying the getter from the optional | |
1435 property, and looking up the setter in the | |
1436 interface. */ | |
1437 x = maybe_make_artificial_property_decl (NULL_TREE, | |
1438 NULL_TREE, | |
1439 rprotos, | |
1440 property_ident, | |
1441 false, | |
1442 PROPERTY_GETTER_NAME (x)); | |
1443 } | |
1444 } | |
1445 } | |
1446 else if (objc_method_context) | |
1447 { | |
1448 /* Else, if we are inside a method it could be the case of | |
1449 'super' or 'self'. */ | |
1450 tree interface_type = NULL_TREE; | |
1451 tree t = object; | |
1452 while (TREE_CODE (t) == COMPOUND_EXPR | |
1453 || TREE_CODE (t) == MODIFY_EXPR | |
1454 || CONVERT_EXPR_P (t) | |
1455 || TREE_CODE (t) == COMPONENT_REF) | |
1456 t = TREE_OPERAND (t, 0); | |
1457 | |
1458 if (t == UOBJC_SUPER_decl) | |
1459 interface_type = lookup_interface (CLASS_SUPER_NAME (implementation_template)); | |
1460 else if (t == self_decl) | |
1461 interface_type = lookup_interface (CLASS_NAME (implementation_template)); | |
1462 | |
1463 if (interface_type) | |
1464 { | |
1465 if (TREE_CODE (objc_method_context) != CLASS_METHOD_DECL) | |
1466 x = lookup_property (interface_type, property_ident); | |
1467 | |
1468 if (x == NULL_TREE) | |
1469 { | |
1470 /* Try the dot-syntax without a declared property. | |
1471 If this is an access to 'self', it is possible | |
1472 that they may refer to a setter/getter that is | |
1473 not declared in the interface, but exists locally | |
1474 in the implementation. In that case, get the | |
1475 implementation context and use it. */ | |
1476 tree implementation = NULL_TREE; | |
1477 | |
1478 if (t == self_decl) | |
1479 implementation = objc_implementation_context; | |
1480 | |
1481 x = maybe_make_artificial_property_decl | |
1482 (interface_type, implementation, NULL_TREE, | |
1483 property_ident, | |
1484 (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL), | |
1485 NULL_TREE); | |
1486 } | |
1487 else if (PROPERTY_OPTIONAL (x) && PROPERTY_READONLY (x)) | |
1488 { | |
1489 tree implementation = NULL_TREE; | |
1490 | |
1491 if (t == self_decl) | |
1492 implementation = objc_implementation_context; | |
1493 | |
1494 x = maybe_make_artificial_property_decl (interface_type, | |
1495 implementation, | |
1496 NULL_TREE, | |
1497 property_ident, | |
1498 false, | |
1499 PROPERTY_GETTER_NAME (x)); | |
1500 } | |
1501 } | |
1502 } | |
1503 } | |
1504 else | |
1505 { | |
1506 /* This is the case where we have more information on 'rtype'. */ | |
1507 tree basetype = TYPE_MAIN_VARIANT (rtype); | |
1508 | |
1509 /* Skip the pointer - if none, it's not an Objective-C object or | |
1510 class. */ | |
1511 if (basetype != NULL_TREE && TREE_CODE (basetype) == POINTER_TYPE) | |
1512 basetype = TREE_TYPE (basetype); | |
1513 else | |
1514 return NULL_TREE; | |
1515 | |
1516 /* Traverse typedefs. */ | |
1517 while (basetype != NULL_TREE | |
1518 && TREE_CODE (basetype) == RECORD_TYPE | |
1519 && OBJC_TYPE_NAME (basetype) | |
1520 && TREE_CODE (OBJC_TYPE_NAME (basetype)) == TYPE_DECL | |
1521 && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (basetype))) | |
1522 basetype = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (basetype)); | |
1523 | |
1524 if (basetype != NULL_TREE && TYPED_OBJECT (basetype)) | |
1525 { | |
1526 tree interface_type = TYPE_OBJC_INTERFACE (basetype); | |
1527 tree protocol_list = TYPE_OBJC_PROTOCOL_LIST (basetype); | |
1528 | |
1529 if (interface_type | |
1530 && (TREE_CODE (interface_type) == CLASS_INTERFACE_TYPE | |
1531 || TREE_CODE (interface_type) == CATEGORY_INTERFACE_TYPE | |
1532 || TREE_CODE (interface_type) == PROTOCOL_INTERFACE_TYPE)) | |
1533 { | |
1534 /* Not sure 'rtype' could ever be a class here! Just | |
1535 for safety we keep the checks. */ | |
1536 if (!IS_CLASS (rtype)) | |
1537 { | |
1538 x = lookup_property (interface_type, property_ident); | |
1539 | |
1540 if (x == NULL_TREE) | |
1541 x = lookup_property_in_protocol_list (protocol_list, | |
1542 property_ident); | |
1543 } | |
1544 | |
1545 if (x == NULL_TREE) | |
1546 { | |
1547 /* Try the dot-syntax without a declared property. | |
1548 If we are inside a method implementation, it is | |
1549 possible that they may refer to a setter/getter | |
1550 that is not declared in the interface, but exists | |
1551 locally in the implementation. In that case, get | |
1552 the implementation context and use it. */ | |
1553 tree implementation = NULL_TREE; | |
1554 | |
1555 if (objc_implementation_context | |
1556 && CLASS_NAME (objc_implementation_context) | |
1557 == OBJC_TYPE_NAME (interface_type)) | |
1558 implementation = objc_implementation_context; | |
1559 | |
1560 x = maybe_make_artificial_property_decl (interface_type, | |
1561 implementation, | |
1562 protocol_list, | |
1563 property_ident, | |
1564 IS_CLASS (rtype), | |
1565 NULL_TREE); | |
1566 } | |
1567 else if (PROPERTY_OPTIONAL (x) && PROPERTY_READONLY (x)) | |
1568 { | |
1569 tree implementation = NULL_TREE; | |
1570 | |
1571 if (objc_implementation_context | |
1572 && CLASS_NAME (objc_implementation_context) | |
1573 == OBJC_TYPE_NAME (interface_type)) | |
1574 implementation = objc_implementation_context; | |
1575 | |
1576 x = maybe_make_artificial_property_decl (interface_type, | |
1577 implementation, | |
1578 protocol_list, | |
1579 property_ident, | |
1580 false, | |
1581 PROPERTY_GETTER_NAME (x)); | |
1582 } | |
1583 } | |
1584 } | |
1585 } | |
1586 | |
1587 if (x) | |
1588 { | |
1589 tree expression; | |
1590 tree getter_call; | |
1591 tree deprecated_method_prototype = NULL_TREE; | |
1592 | |
1593 /* We have an additional nasty problem here; if this | |
1594 PROPERTY_REF needs to become a 'getter', then the conversion | |
1595 from PROPERTY_REF into a getter call happens in gimplify, | |
1596 after the selector table has already been generated and when | |
1597 it is too late to add another selector to it. To work around | |
1598 the problem, we always create the getter call at this stage, | |
1599 which puts the selector in the table. Note that if the | |
1600 PROPERTY_REF becomes a 'setter' instead of a 'getter', then | |
1601 we have added a selector too many to the selector table. | |
1602 This is a little inefficient. | |
1603 | |
1604 Also note that method calls to 'self' and 'super' require the | |
1605 context (self_decl, UOBJS_SUPER_decl, | |
1606 objc_implementation_context etc) to be built correctly; this | |
1607 is yet another reason why building the call at the gimplify | |
1608 stage (when this context has been lost) is not very | |
1609 practical. If we build it at this stage, we know it will | |
1610 always be built correctly. | |
1611 | |
1612 If the PROPERTY_HAS_NO_GETTER() (ie, it is an artificial | |
1613 property decl created to deal with a dotsyntax not really | |
1614 referring to an existing property) then do not try to build a | |
1615 call to the getter as there is no getter. */ | |
1616 if (PROPERTY_HAS_NO_GETTER (x)) | |
1617 getter_call = NULL_TREE; | |
1618 else | |
1619 getter_call = objc_finish_message_expr | |
1620 (object, PROPERTY_GETTER_NAME (x), NULL_TREE, | |
1621 /* Disable the immediate deprecation warning if the getter | |
1622 is deprecated, but record the fact that the getter is | |
1623 deprecated by setting PROPERTY_REF_DEPRECATED_GETTER to | |
1624 the method prototype. */ | |
1625 &deprecated_method_prototype); | |
1626 | |
1627 expression = build4 (PROPERTY_REF, TREE_TYPE(x), object, x, getter_call, | |
1628 deprecated_method_prototype); | |
1629 SET_EXPR_LOCATION (expression, input_location); | |
1630 TREE_SIDE_EFFECTS (expression) = 1; | |
1631 | |
1632 return expression; | |
1633 } | |
1634 | |
1635 return NULL_TREE; | |
1636 } | |
1637 | |
1638 /* This hook routine is invoked by the parser when an expression such | |
1639 as 'xxx.yyy' is parsed, and 'xxx' is a class name. This is the | |
1640 Objective-C 2.0 dot-syntax applied to classes, so we need to | |
1641 convert it into a setter/getter call on the class. */ | |
1642 tree | |
1643 objc_build_class_component_ref (tree class_name, tree property_ident) | |
1644 { | |
1645 tree x = NULL_TREE; | |
1646 tree object, rtype; | |
1647 | |
1648 if (flag_objc1_only) | |
1649 error_at (input_location, "the dot syntax is not available in Objective-C 1.0"); | |
1650 | |
1651 if (class_name == NULL_TREE || class_name == error_mark_node | |
1652 || TREE_CODE (class_name) != IDENTIFIER_NODE) | |
1653 return error_mark_node; | |
1654 | |
1655 if (property_ident == NULL_TREE || property_ident == error_mark_node | |
1656 || TREE_CODE (property_ident) != IDENTIFIER_NODE) | |
1657 return NULL_TREE; | |
1658 | |
1659 object = objc_get_class_reference (class_name); | |
1660 if (!object) | |
1661 { | |
1662 /* We know that 'class_name' is an Objective-C class name as the | |
1663 parser won't call this function if it is not. This is only a | |
1664 double-check for safety. */ | |
1665 error_at (input_location, "could not find class %qE", class_name); | |
1666 return error_mark_node; | |
1667 } | |
1668 | |
1669 rtype = lookup_interface (class_name); | |
1670 if (!rtype) | |
1671 { | |
1672 /* Again, this should never happen, but we do check. */ | |
1673 error_at (input_location, "could not find interface for class %qE", class_name); | |
1674 return error_mark_node; | |
1675 } | |
1676 else | |
1677 { | |
1678 if (TREE_DEPRECATED (rtype)) | |
1679 warning (OPT_Wdeprecated_declarations, "class %qE is deprecated", class_name); | |
1680 } | |
1681 | |
1682 x = maybe_make_artificial_property_decl (rtype, NULL_TREE, NULL_TREE, | |
1683 property_ident, | |
1684 true, NULL_TREE); | |
1685 | |
1686 if (x) | |
1687 { | |
1688 tree expression; | |
1689 tree getter_call; | |
1690 tree deprecated_method_prototype = NULL_TREE; | |
1691 | |
1692 if (PROPERTY_HAS_NO_GETTER (x)) | |
1693 getter_call = NULL_TREE; | |
1694 else | |
1695 getter_call = objc_finish_message_expr | |
1696 (object, PROPERTY_GETTER_NAME (x), NULL_TREE, | |
1697 &deprecated_method_prototype); | |
1698 | |
1699 expression = build4 (PROPERTY_REF, TREE_TYPE(x), object, x, getter_call, | |
1700 deprecated_method_prototype); | |
1701 SET_EXPR_LOCATION (expression, input_location); | |
1702 TREE_SIDE_EFFECTS (expression) = 1; | |
1703 | |
1704 return expression; | |
1705 } | |
1706 else | |
1707 { | |
1708 error_at (input_location, "could not find setter/getter for %qE in class %qE", | |
1709 property_ident, class_name); | |
1710 return error_mark_node; | |
1711 } | |
1712 | |
1713 return NULL_TREE; | |
1714 } | |
1715 | |
1716 | |
1717 | |
1718 /* This is used because we don't want to expose PROPERTY_REF to the | |
1719 C/C++ frontends. Maybe we should! */ | |
1720 bool | |
1721 objc_is_property_ref (tree node) | |
1722 { | |
1723 if (node && TREE_CODE (node) == PROPERTY_REF) | |
1724 return true; | |
1725 else | |
1726 return false; | |
1727 } | |
1728 | |
1729 /* This function builds a setter call for a PROPERTY_REF (real, for a | |
1730 declared property, or artificial, for a dot-syntax accessor which | |
1731 is not corresponding to a property). 'lhs' must be a PROPERTY_REF | |
1732 (the caller must check this beforehand). 'rhs' is the value to | |
1733 assign to the property. A plain setter call is returned, or | |
1734 error_mark_node if the property is readonly. */ | |
1735 | |
1736 static tree | |
1737 objc_build_setter_call (tree lhs, tree rhs) | |
1738 { | |
1739 tree object_expr = PROPERTY_REF_OBJECT (lhs); | |
1740 tree property_decl = PROPERTY_REF_PROPERTY_DECL (lhs); | |
1741 | |
1742 if (PROPERTY_READONLY (property_decl)) | |
1743 { | |
1744 error ("readonly property can not be set"); | |
1745 return error_mark_node; | |
1746 } | |
1747 else | |
1748 { | |
1749 tree setter_argument = build_tree_list (NULL_TREE, rhs); | |
1750 tree setter; | |
1751 | |
1752 /* TODO: Check that the setter return type is 'void'. */ | |
1753 | |
1754 /* TODO: Decay arguments in C. */ | |
1755 setter = objc_finish_message_expr (object_expr, | |
1756 PROPERTY_SETTER_NAME (property_decl), | |
1757 setter_argument, NULL); | |
1758 return setter; | |
1759 } | |
1760 | |
1761 /* Unreachable, but the compiler may not realize. */ | |
1762 return error_mark_node; | |
1763 } | |
1764 | |
1765 /* This hook routine is called when a MODIFY_EXPR is being built. We | |
1766 check what is being modified; if it is a PROPERTY_REF, we need to | |
1767 generate a 'setter' function call for the property. If this is not | |
1768 a PROPERTY_REF, we return NULL_TREE and the C/C++ frontend will go | |
1769 on creating their MODIFY_EXPR. | |
1770 | |
1771 This is used for example if you write | |
1772 | |
1773 object.count = 1; | |
1774 | |
1775 where 'count' is a property. The left-hand side creates a | |
1776 PROPERTY_REF, and then the compiler tries to generate a MODIFY_EXPR | |
1777 to assign something to it. We intercept that here, and generate a | |
1778 call to the 'setter' method instead. */ | |
1779 tree | |
1780 objc_maybe_build_modify_expr (tree lhs, tree rhs) | |
1781 { | |
1782 if (lhs && TREE_CODE (lhs) == PROPERTY_REF) | |
1783 { | |
1784 /* Building a simple call to the setter method would work for cases such as | |
1785 | |
1786 object.count = 1; | |
1787 | |
1788 but wouldn't work for cases such as | |
1789 | |
1790 count = object2.count = 1; | |
1791 | |
1792 to get these to work with very little effort, we build a | |
1793 compound statement which does the setter call (to set the | |
1794 property to 'rhs'), but which can also be evaluated returning | |
1795 the 'rhs'. If the 'rhs' has no side effects, we can simply | |
1796 evaluate it twice, building | |
1797 | |
1798 ([object setProperty: rhs]; rhs) | |
1799 | |
1800 If it has side effects, we put it in a temporary variable first, | |
1801 so we create the following: | |
1802 | |
1803 (temp = rhs; [object setProperty: temp]; temp) | |
1804 | |
1805 setter_argument is rhs in the first case, and temp in the second | |
1806 case. | |
1807 */ | |
1808 tree setter_argument; | |
1809 | |
1810 /* s1, s2 and s3 are the tree statements that we need in the | |
1811 compound expression. */ | |
1812 tree s1, s2, s3, compound_expr; | |
1813 | |
1814 if (TREE_SIDE_EFFECTS (rhs)) | |
1815 { | |
1816 tree bind; | |
1817 | |
1818 /* Declare __objc_property_temp in a local bind. */ | |
1819 setter_argument = objc_create_temporary_var (TREE_TYPE (rhs), "__objc_property_temp"); | |
1820 DECL_SOURCE_LOCATION (setter_argument) = input_location; | |
1821 bind = build3 (BIND_EXPR, void_type_node, setter_argument, NULL, NULL); | |
1822 SET_EXPR_LOCATION (bind, input_location); | |
1823 TREE_SIDE_EFFECTS (bind) = 1; | |
1824 add_stmt (bind); | |
1825 | |
1826 /* s1: x = rhs */ | |
1827 s1 = build_modify_expr (input_location, setter_argument, NULL_TREE, | |
1828 NOP_EXPR, | |
1829 input_location, rhs, NULL_TREE); | |
1830 SET_EXPR_LOCATION (s1, input_location); | |
1831 } | |
1832 else | |
1833 { | |
1834 /* No s1. */ | |
1835 setter_argument = rhs; | |
1836 s1 = NULL_TREE; | |
1837 } | |
1838 | |
1839 /* Now build the compound statement. */ | |
1840 | |
1841 /* s2: [object setProperty: x] */ | |
1842 s2 = objc_build_setter_call (lhs, setter_argument); | |
1843 | |
1844 /* This happens if building the setter failed because the | |
1845 property is readonly. */ | |
1846 if (s2 == error_mark_node) | |
1847 return error_mark_node; | |
1848 | |
1849 SET_EXPR_LOCATION (s2, input_location); | |
1850 | |
1851 /* s3: x */ | |
1852 s3 = convert (TREE_TYPE (lhs), setter_argument); | |
1853 | |
1854 /* Now build the compound statement (s1, s2, s3) or (s2, s3) as | |
1855 appropriate. */ | |
1856 if (s1) | |
1857 compound_expr = build_compound_expr (input_location, build_compound_expr (input_location, s1, s2), s3); | |
1858 else | |
1859 compound_expr = build_compound_expr (input_location, s2, s3); | |
1860 | |
1861 /* Without this, with -Wall you get a 'valued computed is not | |
1862 used' every time there is a "object.property = x" where the | |
1863 value of the resulting MODIFY_EXPR is not used. That is | |
1864 correct (maybe a more sophisticated implementation could | |
1865 avoid generating the compound expression if not needed), but | |
1866 we need to turn it off. */ | |
1867 TREE_NO_WARNING (compound_expr) = 1; | |
1868 return compound_expr; | |
1869 } | |
1870 else | |
1871 return NULL_TREE; | |
1872 } | |
1873 | |
1874 /* This hook is called by the frontend when one of the four unary | |
1875 expressions PREINCREMENT_EXPR, POSTINCREMENT_EXPR, | |
1876 PREDECREMENT_EXPR and POSTDECREMENT_EXPR is being built with an | |
1877 argument which is a PROPERTY_REF. For example, this happens if you have | |
1878 | |
1879 object.count++; | |
1880 | |
1881 where 'count' is a property. We need to use the 'getter' and | |
1882 'setter' for the property in an appropriate way to build the | |
1883 appropriate expression. 'code' is the code for the expression (one | |
1884 of the four mentioned above); 'argument' is the PROPERTY_REF, and | |
1885 'increment' is how much we need to add or subtract. */ | |
1886 tree | |
1887 objc_build_incr_expr_for_property_ref (location_t location, | |
1888 enum tree_code code, | |
1889 tree argument, tree increment) | |
1890 { | |
1891 /* Here are the expressions that we want to build: | |
1892 | |
1893 For PREINCREMENT_EXPR / PREDECREMENT_EXPR: | |
1894 (temp = [object property] +/- increment, [object setProperty: temp], temp) | |
1895 | |
1896 For POSTINCREMENT_EXPR / POSTECREMENT_EXPR: | |
1897 (temp = [object property], [object setProperty: temp +/- increment], temp) */ | |
1898 | |
1899 tree temp_variable_decl, bind; | |
1900 /* s1, s2 and s3 are the tree statements that we need in the | |
1901 compound expression. */ | |
1902 tree s1, s2, s3, compound_expr; | |
1903 | |
1904 /* Safety check. */ | |
1905 if (!argument || TREE_CODE (argument) != PROPERTY_REF) | |
1906 return error_mark_node; | |
1907 | |
1908 /* Declare __objc_property_temp in a local bind. */ | |
1909 temp_variable_decl = objc_create_temporary_var (TREE_TYPE (argument), "__objc_property_temp"); | |
1910 DECL_SOURCE_LOCATION (temp_variable_decl) = location; | |
1911 bind = build3 (BIND_EXPR, void_type_node, temp_variable_decl, NULL, NULL); | |
1912 SET_EXPR_LOCATION (bind, location); | |
1913 TREE_SIDE_EFFECTS (bind) = 1; | |
1914 add_stmt (bind); | |
1915 | |
1916 /* Now build the compound statement. */ | |
1917 | |
1918 /* Note that the 'getter' is generated at gimplify time; at this | |
1919 time, we can simply put the property_ref (ie, argument) wherever | |
1920 we want the getter ultimately to be. */ | |
1921 | |
1922 /* s1: __objc_property_temp = [object property] <+/- increment> */ | |
1923 switch (code) | |
1924 { | |
1925 case PREINCREMENT_EXPR: | |
1926 /* __objc_property_temp = [object property] + increment */ | |
1927 s1 = build_modify_expr (location, temp_variable_decl, NULL_TREE, | |
1928 NOP_EXPR, | |
1929 location, build2 (PLUS_EXPR, TREE_TYPE (argument), | |
1930 argument, increment), NULL_TREE); | |
1931 break; | |
1932 case PREDECREMENT_EXPR: | |
1933 /* __objc_property_temp = [object property] - increment */ | |
1934 s1 = build_modify_expr (location, temp_variable_decl, NULL_TREE, | |
1935 NOP_EXPR, | |
1936 location, build2 (MINUS_EXPR, TREE_TYPE (argument), | |
1937 argument, increment), NULL_TREE); | |
1938 break; | |
1939 case POSTINCREMENT_EXPR: | |
1940 case POSTDECREMENT_EXPR: | |
1941 /* __objc_property_temp = [object property] */ | |
1942 s1 = build_modify_expr (location, temp_variable_decl, NULL_TREE, | |
1943 NOP_EXPR, | |
1944 location, argument, NULL_TREE); | |
1945 break; | |
1946 default: | |
1947 gcc_unreachable (); | |
1948 } | |
1949 | |
1950 /* s2: [object setProperty: __objc_property_temp <+/- increment>] */ | |
1951 switch (code) | |
1952 { | |
1953 case PREINCREMENT_EXPR: | |
1954 case PREDECREMENT_EXPR: | |
1955 /* [object setProperty: __objc_property_temp] */ | |
1956 s2 = objc_build_setter_call (argument, temp_variable_decl); | |
1957 break; | |
1958 case POSTINCREMENT_EXPR: | |
1959 /* [object setProperty: __objc_property_temp + increment] */ | |
1960 s2 = objc_build_setter_call (argument, | |
1961 build2 (PLUS_EXPR, TREE_TYPE (argument), | |
1962 temp_variable_decl, increment)); | |
1963 break; | |
1964 case POSTDECREMENT_EXPR: | |
1965 /* [object setProperty: __objc_property_temp - increment] */ | |
1966 s2 = objc_build_setter_call (argument, | |
1967 build2 (MINUS_EXPR, TREE_TYPE (argument), | |
1968 temp_variable_decl, increment)); | |
1969 break; | |
1970 default: | |
1971 gcc_unreachable (); | |
1972 } | |
1973 | |
1974 /* This happens if building the setter failed because the property | |
1975 is readonly. */ | |
1976 if (s2 == error_mark_node) | |
1977 return error_mark_node; | |
1978 | |
1979 SET_EXPR_LOCATION (s2, location); | |
1980 | |
1981 /* s3: __objc_property_temp */ | |
1982 s3 = convert (TREE_TYPE (argument), temp_variable_decl); | |
1983 | |
1984 /* Now build the compound statement (s1, s2, s3) */ | |
1985 compound_expr = build_compound_expr (location, build_compound_expr (location, s1, s2), s3); | |
1986 | |
1987 /* Prevent C++ from warning with -Wall that "right operand of comma | |
1988 operator has no effect". */ | |
1989 TREE_NO_WARNING (compound_expr) = 1; | |
1990 return compound_expr; | |
1991 } | |
1992 | |
1993 tree | |
1994 objc_build_method_signature (bool is_class_method, tree rettype, tree selector, | |
1995 tree optparms, bool ellipsis) | |
1996 { | |
1997 if (is_class_method) | |
1998 return build_method_decl (CLASS_METHOD_DECL, rettype, selector, | |
1999 optparms, ellipsis); | |
2000 else | |
2001 return build_method_decl (INSTANCE_METHOD_DECL, rettype, selector, | |
2002 optparms, ellipsis); | |
2003 } | |
2004 | |
2005 void | |
2006 objc_add_method_declaration (bool is_class_method, tree decl, tree attributes) | |
2007 { | |
2008 if (!objc_interface_context) | |
2009 { | |
2010 /* PS: At the moment, due to how the parser works, it should be | |
2011 impossible to get here. But it's good to have the check in | |
2012 case the parser changes. | |
2013 */ | |
2014 fatal_error (input_location, | |
2015 "method declaration not in @interface context"); | |
2016 } | |
2017 | |
2018 if (flag_objc1_only && attributes) | |
2019 error_at (input_location, "method attributes are not available in Objective-C 1.0"); | |
2020 | |
2021 objc_decl_method_attributes (&decl, attributes, 0); | |
2022 objc_add_method (objc_interface_context, | |
2023 decl, | |
2024 is_class_method, | |
2025 objc_method_optional_flag); | |
2026 } | |
2027 | |
2028 /* Return 'true' if the method definition could be started, and | |
2029 'false' if not (because we are outside an @implementation context). | |
2030 EXPR is NULL or an expression that needs to be evaluated for the | |
2031 side effects of array size expressions in the parameters. | |
2032 */ | |
2033 bool | |
2034 objc_start_method_definition (bool is_class_method, tree decl, tree attributes, | |
2035 tree expr) | |
2036 { | |
2037 if (!objc_implementation_context) | |
2038 { | |
2039 error ("method definition not in @implementation context"); | |
2040 return false; | |
2041 } | |
2042 | |
2043 if (decl != NULL_TREE && METHOD_SEL_NAME (decl) == error_mark_node) | |
2044 return false; | |
2045 | |
2046 #ifndef OBJCPLUS | |
2047 /* Indicate no valid break/continue context by setting these variables | |
2048 to some non-null, non-label value. We'll notice and emit the proper | |
2049 error message in c_finish_bc_stmt. */ | |
2050 c_break_label = c_cont_label = size_zero_node; | |
2051 #endif | |
2052 | |
2053 if (attributes) | |
2054 warning_at (input_location, 0, "method attributes can not be specified in @implementation context"); | |
2055 else | |
2056 objc_decl_method_attributes (&decl, attributes, 0); | |
2057 | |
2058 objc_add_method (objc_implementation_context, | |
2059 decl, | |
2060 is_class_method, | |
2061 /* is optional */ false); | |
2062 start_method_def (decl, expr); | |
2063 return true; | |
2064 } | |
2065 | |
2066 void | |
2067 objc_add_instance_variable (tree decl) | |
2068 { | |
2069 (void) add_instance_variable (objc_ivar_context, | |
2070 objc_ivar_visibility, | |
2071 decl); | |
2072 } | |
2073 | |
2074 /* Construct a C struct with same name as KLASS, a base struct with tag | |
2075 SUPER_NAME (if any), and FIELDS indicated. */ | |
2076 | |
2077 static tree | |
2078 objc_build_struct (tree klass, tree fields, tree super_name) | |
2079 { | |
2080 tree name = CLASS_NAME (klass); | |
2081 tree s = objc_start_struct (name); | |
2082 tree super = (super_name ? xref_tag (RECORD_TYPE, super_name) : NULL_TREE); | |
2083 tree t; | |
2084 vec<tree> objc_info = vNULL; | |
2085 int i; | |
2086 | |
2087 if (super) | |
2088 { | |
2089 /* Prepend a packed variant of the base class into the layout. This | |
2090 is necessary to preserve ObjC ABI compatibility. */ | |
2091 tree base = build_decl (input_location, | |
2092 FIELD_DECL, NULL_TREE, super); | |
2093 tree field = TYPE_FIELDS (super); | |
2094 | |
2095 while (field && DECL_CHAIN (field) | |
2096 && TREE_CODE (DECL_CHAIN (field)) == FIELD_DECL) | |
2097 field = DECL_CHAIN (field); | |
2098 | |
2099 /* For ObjC ABI purposes, the "packed" size of a base class is | |
2100 the sum of the offset and the size (in bits) of the last field | |
2101 in the class. */ | |
2102 DECL_SIZE (base) | |
2103 = (field && TREE_CODE (field) == FIELD_DECL | |
2104 ? size_binop (PLUS_EXPR, | |
2105 size_binop (PLUS_EXPR, | |
2106 size_binop | |
2107 (MULT_EXPR, | |
2108 convert (bitsizetype, | |
2109 DECL_FIELD_OFFSET (field)), | |
2110 bitsize_int (BITS_PER_UNIT)), | |
2111 DECL_FIELD_BIT_OFFSET (field)), | |
2112 DECL_SIZE (field)) | |
2113 : bitsize_zero_node); | |
2114 DECL_SIZE_UNIT (base) | |
2115 = size_binop (FLOOR_DIV_EXPR, convert (sizetype, DECL_SIZE (base)), | |
2116 size_int (BITS_PER_UNIT)); | |
2117 DECL_ARTIFICIAL (base) = 1; | |
2118 SET_DECL_ALIGN (base, 1); | |
2119 DECL_FIELD_CONTEXT (base) = s; | |
2120 #ifdef OBJCPLUS | |
2121 DECL_FIELD_IS_BASE (base) = 1; | |
2122 | |
2123 if (fields) | |
2124 TREE_NO_WARNING (fields) = 1; /* Suppress C++ ABI warnings -- we */ | |
2125 #endif /* are following the ObjC ABI here. */ | |
2126 DECL_CHAIN (base) = fields; | |
2127 fields = base; | |
2128 } | |
2129 | |
2130 /* NB: Calling finish_struct() may cause type TYPE_OBJC_INFO | |
2131 information in all variants of this RECORD_TYPE to be destroyed | |
2132 (this is because the C frontend manipulates TYPE_LANG_SPECIFIC | |
2133 for something else and then will change all variants to use the | |
2134 same resulting TYPE_LANG_SPECIFIC, ignoring the fact that we use | |
2135 it for ObjC protocols and that such propagation will make all | |
2136 variants use the same objc_info), but it is therein that we store | |
2137 protocol conformance info (e.g., 'NSObject <MyProtocol>'). | |
2138 Hence, we must save the ObjC-specific information before calling | |
2139 finish_struct(), and then reinstate it afterwards. */ | |
2140 | |
2141 for (t = TYPE_MAIN_VARIANT (s); t; t = TYPE_NEXT_VARIANT (t)) | |
2142 { | |
2143 INIT_TYPE_OBJC_INFO (t); | |
2144 objc_info.safe_push (TYPE_OBJC_INFO (t)); | |
2145 } | |
2146 | |
2147 s = objc_finish_struct (s, fields); | |
2148 | |
2149 for (i = 0, t = TYPE_MAIN_VARIANT (s); t; t = TYPE_NEXT_VARIANT (t), i++) | |
2150 { | |
2151 /* We now want to restore the different TYPE_OBJC_INFO, but we | |
2152 have the additional problem that the C frontend doesn't just | |
2153 copy TYPE_LANG_SPECIFIC from one variant to the other; it | |
2154 actually makes all of them the *same* TYPE_LANG_SPECIFIC. As | |
2155 we need a different TYPE_OBJC_INFO for each (and | |
2156 TYPE_OBJC_INFO is a field in TYPE_LANG_SPECIFIC), we need to | |
2157 make a copy of each TYPE_LANG_SPECIFIC before we modify | |
2158 TYPE_OBJC_INFO. */ | |
2159 if (TYPE_LANG_SPECIFIC (t)) | |
2160 { | |
2161 /* Create a copy of TYPE_LANG_SPECIFIC. */ | |
2162 struct lang_type *old_lang_type = TYPE_LANG_SPECIFIC (t); | |
2163 ALLOC_OBJC_TYPE_LANG_SPECIFIC (t); | |
2164 memcpy (TYPE_LANG_SPECIFIC (t), old_lang_type, | |
2165 SIZEOF_OBJC_TYPE_LANG_SPECIFIC); | |
2166 } | |
2167 else | |
2168 { | |
2169 /* Just create a new one. */ | |
2170 ALLOC_OBJC_TYPE_LANG_SPECIFIC (t); | |
2171 } | |
2172 /* Replace TYPE_OBJC_INFO with the saved one. This restores any | |
2173 protocol information that may have been associated with the | |
2174 type. */ | |
2175 TYPE_OBJC_INFO (t) = objc_info[i]; | |
2176 /* Replace the IDENTIFIER_NODE with an actual @interface now | |
2177 that we have it. */ | |
2178 TYPE_OBJC_INTERFACE (t) = klass; | |
2179 } | |
2180 objc_info.release (); | |
2181 | |
2182 /* Use TYPE_BINFO structures to point at the super class, if any. */ | |
2183 objc_xref_basetypes (s, super); | |
2184 | |
2185 /* Mark this struct as a class template. */ | |
2186 CLASS_STATIC_TEMPLATE (klass) = s; | |
2187 | |
2188 return s; | |
2189 } | |
2190 | |
2191 /* Mark DECL as being 'volatile' for purposes of Darwin | |
2192 _setjmp()/_longjmp() exception handling. Called from | |
2193 objc_mark_locals_volatile(). */ | |
2194 void | |
2195 objc_volatilize_decl (tree decl) | |
2196 { | |
2197 /* Do not mess with variables that are 'static' or (already) | |
2198 'volatile'. */ | |
2199 if (!TREE_THIS_VOLATILE (decl) && !TREE_STATIC (decl) | |
2200 && (TREE_CODE (decl) == VAR_DECL | |
2201 || TREE_CODE (decl) == PARM_DECL)) | |
2202 { | |
2203 if (local_variables_to_volatilize == NULL) | |
2204 vec_alloc (local_variables_to_volatilize, 8); | |
2205 | |
2206 vec_safe_push (local_variables_to_volatilize, decl); | |
2207 } | |
2208 } | |
2209 | |
2210 /* Called when parsing of a function completes; if any local variables | |
2211 in the function were marked as variables to volatilize, change them | |
2212 to volatile. We do this at the end of the function when the | |
2213 warnings about discarding 'volatile' have already been produced. | |
2214 We are making the variables as volatile just to force the compiler | |
2215 to preserve them between setjmp/longjmp, but we don't want warnings | |
2216 for them as they aren't really volatile. */ | |
2217 void | |
2218 objc_finish_function (void) | |
2219 { | |
2220 /* If there are any local variables to volatilize, volatilize them. */ | |
2221 if (local_variables_to_volatilize) | |
2222 { | |
2223 int i; | |
2224 tree decl; | |
2225 FOR_EACH_VEC_ELT (*local_variables_to_volatilize, i, decl) | |
2226 { | |
2227 tree t = TREE_TYPE (decl); | |
2228 | |
2229 t = build_qualified_type (t, TYPE_QUALS (t) | TYPE_QUAL_VOLATILE); | |
2230 TREE_TYPE (decl) = t; | |
2231 TREE_THIS_VOLATILE (decl) = 1; | |
2232 TREE_SIDE_EFFECTS (decl) = 1; | |
2233 DECL_REGISTER (decl) = 0; | |
2234 #ifndef OBJCPLUS | |
2235 C_DECL_REGISTER (decl) = 0; | |
2236 #endif | |
2237 } | |
2238 | |
2239 /* Now we delete the vector. This sets it to NULL as well. */ | |
2240 vec_free (local_variables_to_volatilize); | |
2241 } | |
2242 } | |
2243 | |
2244 /* Check if protocol PROTO is adopted (directly or indirectly) by class CLS | |
2245 (including its categories and superclasses) or by object type TYP. | |
2246 Issue a warning if PROTO is not adopted anywhere and WARN is set. */ | |
2247 | |
2248 static bool | |
2249 objc_lookup_protocol (tree proto, tree cls, tree typ, bool warn) | |
2250 { | |
2251 bool class_type = (cls != NULL_TREE); | |
2252 | |
2253 while (cls) | |
2254 { | |
2255 tree c; | |
2256 | |
2257 /* Check protocols adopted by the class and its categories. */ | |
2258 for (c = cls; c; c = CLASS_CATEGORY_LIST (c)) | |
2259 { | |
2260 if (lookup_protocol_in_reflist (CLASS_PROTOCOL_LIST (c), proto)) | |
2261 return true; | |
2262 } | |
2263 | |
2264 /* Repeat for superclasses. */ | |
2265 cls = lookup_interface (CLASS_SUPER_NAME (cls)); | |
2266 } | |
2267 | |
2268 /* Check for any protocols attached directly to the object type. */ | |
2269 if (TYPE_HAS_OBJC_INFO (typ)) | |
2270 { | |
2271 if (lookup_protocol_in_reflist (TYPE_OBJC_PROTOCOL_LIST (typ), proto)) | |
2272 return true; | |
2273 } | |
2274 | |
2275 if (warn) | |
2276 { | |
2277 *errbuf = 0; | |
2278 gen_type_name_0 (class_type ? typ : TYPE_POINTER_TO (typ)); | |
2279 /* NB: Types 'id' and 'Class' cannot reasonably be described as | |
2280 "implementing" a given protocol, since they do not have an | |
2281 implementation. */ | |
2282 if (class_type) | |
2283 warning (0, "class %qs does not implement the %qE protocol", | |
2284 identifier_to_locale (errbuf), PROTOCOL_NAME (proto)); | |
2285 else | |
2286 warning (0, "type %qs does not conform to the %qE protocol", | |
2287 identifier_to_locale (errbuf), PROTOCOL_NAME (proto)); | |
2288 } | |
2289 | |
2290 return false; | |
2291 } | |
2292 | |
2293 /* Check if class RCLS and instance struct type RTYP conform to at least the | |
2294 same protocols that LCLS and LTYP conform to. */ | |
2295 | |
2296 static bool | |
2297 objc_compare_protocols (tree lcls, tree ltyp, tree rcls, tree rtyp, bool warn) | |
2298 { | |
2299 tree p; | |
2300 bool have_lproto = false; | |
2301 | |
2302 while (lcls) | |
2303 { | |
2304 /* NB: We do _not_ look at categories defined for LCLS; these may or | |
2305 may not get loaded in, and therefore it is unreasonable to require | |
2306 that RCLS/RTYP must implement any of their protocols. */ | |
2307 for (p = CLASS_PROTOCOL_LIST (lcls); p; p = TREE_CHAIN (p)) | |
2308 { | |
2309 have_lproto = true; | |
2310 | |
2311 if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn)) | |
2312 return warn; | |
2313 } | |
2314 | |
2315 /* Repeat for superclasses. */ | |
2316 lcls = lookup_interface (CLASS_SUPER_NAME (lcls)); | |
2317 } | |
2318 | |
2319 /* Check for any protocols attached directly to the object type. */ | |
2320 if (TYPE_HAS_OBJC_INFO (ltyp)) | |
2321 { | |
2322 for (p = TYPE_OBJC_PROTOCOL_LIST (ltyp); p; p = TREE_CHAIN (p)) | |
2323 { | |
2324 have_lproto = true; | |
2325 | |
2326 if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn)) | |
2327 return warn; | |
2328 } | |
2329 } | |
2330 | |
2331 /* NB: If LTYP and LCLS have no protocols to search for, return 'true' | |
2332 vacuously, _unless_ RTYP is a protocol-qualified 'id'. We can get | |
2333 away with simply checking for 'id' or 'Class' (!RCLS), since this | |
2334 routine will not get called in other cases. */ | |
2335 return have_lproto || (rcls != NULL_TREE); | |
2336 } | |
2337 | |
2338 /* Given two types TYPE1 and TYPE2, return their least common ancestor. | |
2339 Both TYPE1 and TYPE2 must be pointers, and already determined to be | |
2340 compatible by objc_compare_types() below. */ | |
2341 | |
2342 tree | |
2343 objc_common_type (tree type1, tree type2) | |
2344 { | |
2345 tree inner1 = TREE_TYPE (type1), inner2 = TREE_TYPE (type2); | |
2346 | |
2347 while (POINTER_TYPE_P (inner1)) | |
2348 { | |
2349 inner1 = TREE_TYPE (inner1); | |
2350 inner2 = TREE_TYPE (inner2); | |
2351 } | |
2352 | |
2353 /* If one type is derived from another, return the base type. */ | |
2354 if (DERIVED_FROM_P (inner1, inner2)) | |
2355 return type1; | |
2356 else if (DERIVED_FROM_P (inner2, inner1)) | |
2357 return type2; | |
2358 | |
2359 /* If both types are 'Class', return 'Class'. */ | |
2360 if (objc_is_class_id (inner1) && objc_is_class_id (inner2)) | |
2361 return objc_class_type; | |
2362 | |
2363 /* Otherwise, return 'id'. */ | |
2364 return objc_object_type; | |
2365 } | |
2366 | |
2367 /* Determine if it is permissible to assign (if ARGNO is greater than -3) | |
2368 an instance of RTYP to an instance of LTYP or to compare the two | |
2369 (if ARGNO is equal to -3), per ObjC type system rules. Before | |
2370 returning 'true', this routine may issue warnings related to, e.g., | |
2371 protocol conformance. When returning 'false', the routine must | |
2372 produce absolutely no warnings; the C or C++ front-end will do so | |
2373 instead, if needed. If either LTYP or RTYP is not an Objective-C | |
2374 type, the routine must return 'false'. | |
2375 | |
2376 The ARGNO parameter is encoded as follows: | |
2377 >= 1 Parameter number (CALLEE contains function being called); | |
2378 0 Return value; | |
2379 -1 Assignment; | |
2380 -2 Initialization; | |
2381 -3 Comparison (LTYP and RTYP may match in either direction); | |
2382 -4 Silent comparison (for C++ overload resolution); | |
2383 -5 Silent "specialization" comparison for RTYP to be a "specialization" | |
2384 of LTYP (a specialization means that RTYP is LTYP plus some constraints, | |
2385 so that each object of type RTYP is also of type LTYP). This is used | |
2386 when comparing property types. */ | |
2387 | |
2388 bool | |
2389 objc_compare_types (tree ltyp, tree rtyp, int argno, tree callee) | |
2390 { | |
2391 tree lcls, rcls, lproto, rproto; | |
2392 bool pointers_compatible; | |
2393 | |
2394 /* We must be dealing with pointer types */ | |
2395 if (!POINTER_TYPE_P (ltyp) || !POINTER_TYPE_P (rtyp)) | |
2396 return false; | |
2397 | |
2398 do | |
2399 { | |
2400 ltyp = TREE_TYPE (ltyp); /* Remove indirections. */ | |
2401 rtyp = TREE_TYPE (rtyp); | |
2402 } | |
2403 while (POINTER_TYPE_P (ltyp) && POINTER_TYPE_P (rtyp)); | |
2404 | |
2405 /* We must also handle function pointers, since ObjC is a bit more | |
2406 lenient than C or C++ on this. */ | |
2407 if (TREE_CODE (ltyp) == FUNCTION_TYPE && TREE_CODE (rtyp) == FUNCTION_TYPE) | |
2408 { | |
2409 function_args_iterator liter, riter; | |
2410 | |
2411 /* Return types must be covariant. */ | |
2412 if (!comptypes (TREE_TYPE (ltyp), TREE_TYPE (rtyp)) | |
2413 && !objc_compare_types (TREE_TYPE (ltyp), TREE_TYPE (rtyp), | |
2414 argno, callee)) | |
2415 return false; | |
2416 | |
2417 /* Argument types must be contravariant. */ | |
2418 function_args_iter_init (&liter, ltyp); | |
2419 function_args_iter_init (&riter, rtyp); | |
2420 | |
2421 while (1) | |
2422 { | |
2423 ltyp = function_args_iter_cond (&liter); | |
2424 rtyp = function_args_iter_cond (&riter); | |
2425 | |
2426 /* If we've exhaused both lists simulateously, we're done. */ | |
2427 if (ltyp == NULL_TREE && rtyp == NULL_TREE) | |
2428 break; | |
2429 | |
2430 /* If one list is shorter than the other, they fail to match. */ | |
2431 if (ltyp == NULL_TREE || rtyp == NULL_TREE) | |
2432 return false; | |
2433 | |
2434 if (!comptypes (rtyp, ltyp) | |
2435 && !objc_compare_types (rtyp, ltyp, argno, callee)) | |
2436 return false; | |
2437 | |
2438 function_args_iter_next (&liter); | |
2439 function_args_iter_next (&riter); | |
2440 } | |
2441 | |
2442 return true; | |
2443 } | |
2444 | |
2445 /* Past this point, we are only interested in ObjC class instances, | |
2446 or 'id' or 'Class'. */ | |
2447 if (TREE_CODE (ltyp) != RECORD_TYPE || TREE_CODE (rtyp) != RECORD_TYPE) | |
2448 return false; | |
2449 | |
2450 if (!objc_is_object_id (ltyp) && !objc_is_class_id (ltyp) | |
2451 && !TYPE_HAS_OBJC_INFO (ltyp)) | |
2452 return false; | |
2453 | |
2454 if (!objc_is_object_id (rtyp) && !objc_is_class_id (rtyp) | |
2455 && !TYPE_HAS_OBJC_INFO (rtyp)) | |
2456 return false; | |
2457 | |
2458 /* Past this point, we are committed to returning 'true' to the caller | |
2459 (unless performing a silent comparison; see below). However, we can | |
2460 still warn about type and/or protocol mismatches. */ | |
2461 | |
2462 if (TYPE_HAS_OBJC_INFO (ltyp)) | |
2463 { | |
2464 lcls = TYPE_OBJC_INTERFACE (ltyp); | |
2465 lproto = TYPE_OBJC_PROTOCOL_LIST (ltyp); | |
2466 } | |
2467 else | |
2468 lcls = lproto = NULL_TREE; | |
2469 | |
2470 if (TYPE_HAS_OBJC_INFO (rtyp)) | |
2471 { | |
2472 rcls = TYPE_OBJC_INTERFACE (rtyp); | |
2473 rproto = TYPE_OBJC_PROTOCOL_LIST (rtyp); | |
2474 } | |
2475 else | |
2476 rcls = rproto = NULL_TREE; | |
2477 | |
2478 /* If we could not find an @interface declaration, we must have | |
2479 only seen a @class declaration; for purposes of type comparison, | |
2480 treat it as a stand-alone (root) class. */ | |
2481 | |
2482 if (lcls && TREE_CODE (lcls) == IDENTIFIER_NODE) | |
2483 lcls = NULL_TREE; | |
2484 | |
2485 if (rcls && TREE_CODE (rcls) == IDENTIFIER_NODE) | |
2486 rcls = NULL_TREE; | |
2487 | |
2488 /* If either type is an unqualified 'id', we're done. This is because | |
2489 an 'id' can be assigned to or from any type with no warnings. */ | |
2490 if (argno != -5) | |
2491 { | |
2492 if ((!lproto && objc_is_object_id (ltyp)) | |
2493 || (!rproto && objc_is_object_id (rtyp))) | |
2494 return true; | |
2495 } | |
2496 else | |
2497 { | |
2498 /* For property checks, though, an 'id' is considered the most | |
2499 general type of object, hence if you try to specialize an | |
2500 'NSArray *' (ltyp) property with an 'id' (rtyp) one, we need | |
2501 to warn. */ | |
2502 if (!lproto && objc_is_object_id (ltyp)) | |
2503 return true; | |
2504 } | |
2505 | |
2506 pointers_compatible = (TYPE_MAIN_VARIANT (ltyp) == TYPE_MAIN_VARIANT (rtyp)); | |
2507 | |
2508 /* If the underlying types are the same, and at most one of them has | |
2509 a protocol list, we do not need to issue any diagnostics. */ | |
2510 if (pointers_compatible && (!lproto || !rproto)) | |
2511 return true; | |
2512 | |
2513 /* If exactly one of the types is 'Class', issue a diagnostic; any | |
2514 exceptions of this rule have already been handled. */ | |
2515 if (objc_is_class_id (ltyp) ^ objc_is_class_id (rtyp)) | |
2516 pointers_compatible = false; | |
2517 /* Otherwise, check for inheritance relations. */ | |
2518 else | |
2519 { | |
2520 if (!pointers_compatible) | |
2521 { | |
2522 /* Again, if any of the two is an 'id', we're satisfied, | |
2523 unless we're comparing properties, in which case only an | |
2524 'id' on the left-hand side (old property) is good | |
2525 enough. */ | |
2526 if (argno != -5) | |
2527 pointers_compatible | |
2528 = (objc_is_object_id (ltyp) || objc_is_object_id (rtyp)); | |
2529 else | |
2530 pointers_compatible = objc_is_object_id (ltyp); | |
2531 } | |
2532 | |
2533 if (!pointers_compatible) | |
2534 pointers_compatible = DERIVED_FROM_P (ltyp, rtyp); | |
2535 | |
2536 if (!pointers_compatible && (argno == -3 || argno == -4)) | |
2537 pointers_compatible = DERIVED_FROM_P (rtyp, ltyp); | |
2538 } | |
2539 | |
2540 /* If the pointers match modulo protocols, check for protocol conformance | |
2541 mismatches. */ | |
2542 if (pointers_compatible) | |
2543 { | |
2544 pointers_compatible = objc_compare_protocols (lcls, ltyp, rcls, rtyp, | |
2545 argno != -3); | |
2546 | |
2547 if (!pointers_compatible && argno == -3) | |
2548 pointers_compatible = objc_compare_protocols (rcls, rtyp, lcls, ltyp, | |
2549 argno != -3); | |
2550 } | |
2551 | |
2552 if (!pointers_compatible) | |
2553 { | |
2554 /* The two pointers are not exactly compatible. Issue a warning, unless | |
2555 we are performing a silent comparison, in which case return 'false' | |
2556 instead. */ | |
2557 /* NB: For the time being, we shall make our warnings look like their | |
2558 C counterparts. In the future, we may wish to make them more | |
2559 ObjC-specific. */ | |
2560 switch (argno) | |
2561 { | |
2562 case -5: | |
2563 case -4: | |
2564 return false; | |
2565 | |
2566 case -3: | |
2567 warning (0, "comparison of distinct Objective-C types lacks a cast"); | |
2568 break; | |
2569 | |
2570 case -2: | |
2571 warning (0, "initialization from distinct Objective-C type"); | |
2572 break; | |
2573 | |
2574 case -1: | |
2575 warning (0, "assignment from distinct Objective-C type"); | |
2576 break; | |
2577 | |
2578 case 0: | |
2579 warning (0, "distinct Objective-C type in return"); | |
2580 break; | |
2581 | |
2582 default: | |
2583 warning (0, "passing argument %d of %qE from distinct " | |
2584 "Objective-C type", argno, callee); | |
2585 break; | |
2586 } | |
2587 } | |
2588 | |
2589 return true; | |
2590 } | |
2591 | |
2592 /* This routine is similar to objc_compare_types except that function-pointers are | |
2593 excluded. This is because, caller assumes that common types are of (id, Object*) | |
2594 variety and calls objc_common_type to obtain a common type. There is no commonolty | |
2595 between two function-pointers in this regard. */ | |
2596 | |
2597 bool | |
2598 objc_have_common_type (tree ltyp, tree rtyp, int argno, tree callee) | |
2599 { | |
2600 if (objc_compare_types (ltyp, rtyp, argno, callee)) | |
2601 { | |
2602 /* exclude function-pointer types. */ | |
2603 do | |
2604 { | |
2605 ltyp = TREE_TYPE (ltyp); /* Remove indirections. */ | |
2606 rtyp = TREE_TYPE (rtyp); | |
2607 } | |
2608 while (POINTER_TYPE_P (ltyp) && POINTER_TYPE_P (rtyp)); | |
2609 return !(TREE_CODE (ltyp) == FUNCTION_TYPE && TREE_CODE (rtyp) == FUNCTION_TYPE); | |
2610 } | |
2611 return false; | |
2612 } | |
2613 | |
2614 #ifndef OBJCPLUS | |
2615 /* Determine if CHILD is derived from PARENT. The routine assumes that | |
2616 both parameters are RECORD_TYPEs, and is non-reflexive. */ | |
2617 | |
2618 static bool | |
2619 objc_derived_from_p (tree parent, tree child) | |
2620 { | |
2621 parent = TYPE_MAIN_VARIANT (parent); | |
2622 | |
2623 for (child = TYPE_MAIN_VARIANT (child); | |
2624 TYPE_BINFO (child) && BINFO_N_BASE_BINFOS (TYPE_BINFO (child));) | |
2625 { | |
2626 child = TYPE_MAIN_VARIANT (BINFO_TYPE (BINFO_BASE_BINFO | |
2627 (TYPE_BINFO (child), | |
2628 0))); | |
2629 | |
2630 if (child == parent) | |
2631 return true; | |
2632 } | |
2633 | |
2634 return false; | |
2635 } | |
2636 #endif | |
2637 | |
2638 tree | |
2639 objc_build_component_ref (tree datum, tree component) | |
2640 { | |
2641 /* If COMPONENT is NULL, the caller is referring to the anonymous | |
2642 base class field. */ | |
2643 if (!component) | |
2644 { | |
2645 tree base = TYPE_FIELDS (TREE_TYPE (datum)); | |
2646 | |
2647 return build3 (COMPONENT_REF, TREE_TYPE (base), datum, base, NULL_TREE); | |
2648 } | |
2649 | |
2650 /* The 'build_component_ref' routine has been removed from the C++ | |
2651 front-end, but 'finish_class_member_access_expr' seems to be | |
2652 a worthy substitute. */ | |
2653 #ifdef OBJCPLUS | |
2654 return finish_class_member_access_expr (datum, component, false, | |
2655 tf_warning_or_error); | |
2656 #else | |
2657 return build_component_ref (input_location, datum, component, | |
2658 UNKNOWN_LOCATION); | |
2659 #endif | |
2660 } | |
2661 | |
2662 /* Recursively copy inheritance information rooted at BINFO. To do this, | |
2663 we emulate the song and dance performed by cp/tree.c:copy_binfo(). */ | |
2664 | |
2665 static tree | |
2666 objc_copy_binfo (tree binfo) | |
2667 { | |
2668 tree btype = BINFO_TYPE (binfo); | |
2669 tree binfo2 = make_tree_binfo (BINFO_N_BASE_BINFOS (binfo)); | |
2670 tree base_binfo; | |
2671 int ix; | |
2672 | |
2673 BINFO_TYPE (binfo2) = btype; | |
2674 BINFO_OFFSET (binfo2) = BINFO_OFFSET (binfo); | |
2675 BINFO_BASE_ACCESSES (binfo2) = BINFO_BASE_ACCESSES (binfo); | |
2676 | |
2677 /* Recursively copy base binfos of BINFO. */ | |
2678 for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) | |
2679 { | |
2680 tree base_binfo2 = objc_copy_binfo (base_binfo); | |
2681 | |
2682 BINFO_INHERITANCE_CHAIN (base_binfo2) = binfo2; | |
2683 BINFO_BASE_APPEND (binfo2, base_binfo2); | |
2684 } | |
2685 | |
2686 return binfo2; | |
2687 } | |
2688 | |
2689 /* Record superclass information provided in BASETYPE for ObjC class REF. | |
2690 This is loosely based on cp/decl.c:xref_basetypes(). */ | |
2691 | |
2692 static void | |
2693 objc_xref_basetypes (tree ref, tree basetype) | |
2694 { | |
2695 tree variant; | |
2696 tree binfo = make_tree_binfo (basetype ? 1 : 0); | |
2697 TYPE_BINFO (ref) = binfo; | |
2698 BINFO_OFFSET (binfo) = size_zero_node; | |
2699 BINFO_TYPE (binfo) = ref; | |
2700 | |
2701 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref); | |
2702 for (variant = ref; variant; variant = TYPE_NEXT_VARIANT (variant)) | |
2703 TYPE_BINFO (variant) = binfo; | |
2704 | |
2705 if (basetype) | |
2706 { | |
2707 tree base_binfo = objc_copy_binfo (TYPE_BINFO (basetype)); | |
2708 | |
2709 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo; | |
2710 vec_alloc (BINFO_BASE_ACCESSES (binfo), 1); | |
2711 BINFO_BASE_APPEND (binfo, base_binfo); | |
2712 BINFO_BASE_ACCESS_APPEND (binfo, access_public_node); | |
2713 } | |
2714 } | |
2715 | |
2716 /* Called from finish_decl. */ | |
2717 | |
2718 void | |
2719 objc_check_decl (tree decl) | |
2720 { | |
2721 tree type = TREE_TYPE (decl); | |
2722 | |
2723 if (TREE_CODE (type) != RECORD_TYPE) | |
2724 return; | |
2725 if (OBJC_TYPE_NAME (type) && (type = objc_is_class_name (OBJC_TYPE_NAME (type)))) | |
2726 error ("statically allocated instance of Objective-C class %qE", | |
2727 type); | |
2728 } | |
2729 | |
2730 void | |
2731 objc_check_global_decl (tree decl) | |
2732 { | |
2733 tree id = DECL_NAME (decl); | |
2734 if (objc_is_class_name (id) && global_bindings_p()) | |
2735 error ("redeclaration of Objective-C class %qs", IDENTIFIER_POINTER (id)); | |
2736 } | |
2737 | |
2738 /* Construct a PROTOCOLS-qualified variant of INTERFACE, where | |
2739 INTERFACE may either name an Objective-C class, or refer to the | |
2740 special 'id' or 'Class' types. If INTERFACE is not a valid ObjC | |
2741 type, just return it unchanged. This function is often called when | |
2742 PROTOCOLS is NULL_TREE, in which case we simply look up the | |
2743 appropriate INTERFACE. */ | |
2744 | |
2745 tree | |
2746 objc_get_protocol_qualified_type (tree interface, tree protocols) | |
2747 { | |
2748 /* If INTERFACE is not provided, default to 'id'. */ | |
2749 tree type = (interface ? objc_is_id (interface) : objc_object_type); | |
2750 bool is_ptr = (type != NULL_TREE); | |
2751 | |
2752 if (!is_ptr) | |
2753 { | |
2754 type = objc_is_class_name (interface); | |
2755 | |
2756 if (type) | |
2757 { | |
2758 /* If looking at a typedef, retrieve the precise type it | |
2759 describes. */ | |
2760 if (TREE_CODE (interface) == IDENTIFIER_NODE) | |
2761 interface = identifier_global_value (interface); | |
2762 | |
2763 type = ((interface && TREE_CODE (interface) == TYPE_DECL | |
2764 && DECL_ORIGINAL_TYPE (interface)) | |
2765 ? DECL_ORIGINAL_TYPE (interface) | |
2766 : xref_tag (RECORD_TYPE, type)); | |
2767 } | |
2768 else | |
2769 { | |
2770 /* This case happens when we are given an 'interface' which | |
2771 is not a valid class name. For example if a typedef was | |
2772 used, and 'interface' really is the identifier of the | |
2773 typedef, but when you resolve it you don't get an | |
2774 Objective-C class, but something else, such as 'int'. | |
2775 This is an error; protocols make no sense unless you use | |
2776 them with Objective-C objects. */ | |
2777 error_at (input_location, "only Objective-C object types can be qualified with a protocol"); | |
2778 | |
2779 /* Try to recover. Ignore the invalid class name, and treat | |
2780 the object as an 'id' to silence further warnings about | |
2781 the class. */ | |
2782 type = objc_object_type; | |
2783 is_ptr = true; | |
2784 } | |
2785 } | |
2786 | |
2787 if (protocols) | |
2788 { | |
2789 type = build_variant_type_copy (type); | |
2790 | |
2791 /* For pointers (i.e., 'id' or 'Class'), attach the protocol(s) | |
2792 to the pointee. */ | |
2793 if (is_ptr) | |
2794 { | |
2795 tree orig_pointee_type = TREE_TYPE (type); | |
2796 TREE_TYPE (type) = build_variant_type_copy (orig_pointee_type); | |
2797 | |
2798 /* Set up the canonical type information. */ | |
2799 TYPE_CANONICAL (type) | |
2800 = TYPE_CANONICAL (TYPE_POINTER_TO (orig_pointee_type)); | |
2801 | |
2802 TYPE_POINTER_TO (TREE_TYPE (type)) = type; | |
2803 type = TREE_TYPE (type); | |
2804 } | |
2805 | |
2806 /* Look up protocols and install in lang specific list. */ | |
2807 DUP_TYPE_OBJC_INFO (type, TYPE_MAIN_VARIANT (type)); | |
2808 TYPE_OBJC_PROTOCOL_LIST (type) = lookup_and_install_protocols | |
2809 (protocols, /* definition_required */ false); | |
2810 | |
2811 /* For RECORD_TYPEs, point to the @interface; for 'id' and 'Class', | |
2812 return the pointer to the new pointee variant. */ | |
2813 if (is_ptr) | |
2814 type = TYPE_POINTER_TO (type); | |
2815 else | |
2816 TYPE_OBJC_INTERFACE (type) | |
2817 = TYPE_OBJC_INTERFACE (TYPE_MAIN_VARIANT (type)); | |
2818 } | |
2819 | |
2820 return type; | |
2821 } | |
2822 | |
2823 /* Check for circular dependencies in protocols. The arguments are | |
2824 PROTO, the protocol to check, and LIST, a list of protocol it | |
2825 conforms to. */ | |
2826 | |
2827 static void | |
2828 check_protocol_recursively (tree proto, tree list) | |
2829 { | |
2830 tree p; | |
2831 | |
2832 for (p = list; p; p = TREE_CHAIN (p)) | |
2833 { | |
2834 tree pp = TREE_VALUE (p); | |
2835 | |
2836 if (TREE_CODE (pp) == IDENTIFIER_NODE) | |
2837 pp = lookup_protocol (pp, /* warn if deprecated */ false, | |
2838 /* definition_required */ false); | |
2839 | |
2840 if (pp == proto) | |
2841 fatal_error (input_location, "protocol %qE has circular dependency", | |
2842 PROTOCOL_NAME (pp)); | |
2843 if (pp) | |
2844 check_protocol_recursively (proto, PROTOCOL_LIST (pp)); | |
2845 } | |
2846 } | |
2847 | |
2848 /* Look up PROTOCOLS, and return a list of those that are found. If | |
2849 none are found, return NULL. Note that this function will emit a | |
2850 warning if a protocol is found and is deprecated. If | |
2851 'definition_required', then warn if the protocol is found but is | |
2852 not defined (ie, if we only saw a forward-declaration of the | |
2853 protocol (as in "@protocol NSObject;") not a real definition with | |
2854 the list of methods). */ | |
2855 static tree | |
2856 lookup_and_install_protocols (tree protocols, bool definition_required) | |
2857 { | |
2858 tree proto; | |
2859 tree return_value = NULL_TREE; | |
2860 | |
2861 if (protocols == error_mark_node) | |
2862 return NULL; | |
2863 | |
2864 for (proto = protocols; proto; proto = TREE_CHAIN (proto)) | |
2865 { | |
2866 tree ident = TREE_VALUE (proto); | |
2867 tree p = lookup_protocol (ident, /* warn_if_deprecated */ true, | |
2868 definition_required); | |
2869 | |
2870 if (p) | |
2871 return_value = chainon (return_value, | |
2872 build_tree_list (NULL_TREE, p)); | |
2873 else if (ident != error_mark_node) | |
2874 error ("cannot find protocol declaration for %qE", | |
2875 ident); | |
2876 } | |
2877 | |
2878 return return_value; | |
2879 } | |
2880 | |
2881 static void | |
2882 build_common_objc_exception_stuff (void) | |
2883 { | |
2884 tree noreturn_list, nothrow_list, temp_type; | |
2885 | |
2886 noreturn_list = tree_cons (get_identifier ("noreturn"), NULL, NULL); | |
2887 nothrow_list = tree_cons (get_identifier ("nothrow"), NULL, NULL); | |
2888 | |
2889 /* void objc_exception_throw(id) __attribute__((noreturn)); */ | |
2890 /* void objc_sync_enter(id); */ | |
2891 /* void objc_sync_exit(id); */ | |
2892 temp_type = build_function_type_list (void_type_node, | |
2893 objc_object_type, | |
2894 NULL_TREE); | |
2895 objc_exception_throw_decl | |
2896 = add_builtin_function (TAG_EXCEPTIONTHROW, temp_type, 0, NOT_BUILT_IN, NULL, | |
2897 noreturn_list); | |
2898 /* Make sure that objc_exception_throw (id) claims that it may throw an | |
2899 exception. */ | |
2900 TREE_NOTHROW (objc_exception_throw_decl) = 0; | |
2901 | |
2902 objc_sync_enter_decl | |
2903 = add_builtin_function (TAG_SYNCENTER, temp_type, 0, NOT_BUILT_IN, | |
2904 NULL, nothrow_list); | |
2905 | |
2906 objc_sync_exit_decl | |
2907 = add_builtin_function (TAG_SYNCEXIT, temp_type, 0, NOT_BUILT_IN, | |
2908 NULL, nothrow_list); | |
2909 } | |
2910 | |
2911 /* Purpose: "play" parser, creating/installing representations | |
2912 of the declarations that are required by Objective-C. | |
2913 | |
2914 Model: | |
2915 | |
2916 type_spec--------->sc_spec | |
2917 (tree_list) (tree_list) | |
2918 | | | |
2919 | | | |
2920 identifier_node identifier_node */ | |
2921 | |
2922 static void | |
2923 synth_module_prologue (void) | |
2924 { | |
2925 tree type; | |
2926 enum debug_info_type save_write_symbols = write_symbols; | |
2927 const struct gcc_debug_hooks *const save_hooks = debug_hooks; | |
2928 | |
2929 /* Suppress outputting debug symbols, because | |
2930 dbxout_init hasn't been called yet. */ | |
2931 write_symbols = NO_DEBUG; | |
2932 debug_hooks = &do_nothing_debug_hooks; | |
2933 | |
2934 #ifdef OBJCPLUS | |
2935 push_lang_context (lang_name_c); /* extern "C" */ | |
2936 #endif | |
2937 | |
2938 /* The following are also defined in <objc/objc.h> and friends. */ | |
2939 | |
2940 objc_object_id = get_identifier (TAG_OBJECT); | |
2941 objc_class_id = get_identifier (TAG_CLASS); | |
2942 | |
2943 objc_object_reference = xref_tag (RECORD_TYPE, objc_object_id); | |
2944 objc_class_reference = xref_tag (RECORD_TYPE, objc_class_id); | |
2945 | |
2946 objc_object_type = build_pointer_type (objc_object_reference); | |
2947 objc_class_type = build_pointer_type (objc_class_reference); | |
2948 | |
2949 objc_object_name = get_identifier (OBJECT_TYPEDEF_NAME); | |
2950 objc_class_name = get_identifier (CLASS_TYPEDEF_NAME); | |
2951 | |
2952 /* Declare the 'id' and 'Class' typedefs. */ | |
2953 type = lang_hooks.decls.pushdecl (build_decl (input_location, | |
2954 TYPE_DECL, | |
2955 objc_object_name, | |
2956 objc_object_type)); | |
2957 TREE_NO_WARNING (type) = 1; | |
2958 | |
2959 type = lang_hooks.decls.pushdecl (build_decl (input_location, | |
2960 TYPE_DECL, | |
2961 objc_class_name, | |
2962 objc_class_type)); | |
2963 TREE_NO_WARNING (type) = 1; | |
2964 | |
2965 /* Forward-declare '@interface Protocol'. */ | |
2966 type = get_identifier (PROTOCOL_OBJECT_CLASS_NAME); | |
2967 objc_declare_class (type); | |
2968 objc_protocol_type = build_pointer_type (xref_tag (RECORD_TYPE, type)); | |
2969 | |
2970 /* Declare receiver type used for dispatching messages to 'super'. */ | |
2971 /* `struct objc_super *' */ | |
2972 objc_super_type = build_pointer_type (xref_tag (RECORD_TYPE, | |
2973 get_identifier (TAG_SUPER))); | |
2974 | |
2975 /* Declare pointers to method and ivar lists. */ | |
2976 objc_method_list_ptr = build_pointer_type | |
2977 (xref_tag (RECORD_TYPE, | |
2978 get_identifier (UTAG_METHOD_LIST))); | |
2979 objc_method_proto_list_ptr | |
2980 = build_pointer_type (xref_tag (RECORD_TYPE, | |
2981 get_identifier (UTAG_METHOD_PROTOTYPE_LIST))); | |
2982 objc_ivar_list_ptr = build_pointer_type | |
2983 (xref_tag (RECORD_TYPE, | |
2984 get_identifier (UTAG_IVAR_LIST))); | |
2985 | |
2986 build_common_objc_exception_stuff (); | |
2987 | |
2988 /* Set-up runtime-specific templates, message and exception stuff. */ | |
2989 (*runtime.initialize) (); | |
2990 | |
2991 /* Declare objc_getProperty, object_setProperty and other property | |
2992 accessor helpers. */ | |
2993 build_common_objc_property_accessor_helpers (); | |
2994 | |
2995 /* Forward declare constant_string_id and constant_string_type. */ | |
2996 if (!constant_string_class_name) | |
2997 constant_string_class_name = runtime.default_constant_string_class_name; | |
2998 constant_string_id = get_identifier (constant_string_class_name); | |
2999 objc_declare_class (constant_string_id); | |
3000 | |
3001 /* Pre-build the following entities - for speed/convenience. */ | |
3002 self_id = get_identifier ("self"); | |
3003 ucmd_id = get_identifier ("_cmd"); | |
3004 | |
3005 /* Declare struct _objc_fast_enumeration_state { ... }; */ | |
3006 build_fast_enumeration_state_template (); | |
3007 | |
3008 /* void objc_enumeration_mutation (id) */ | |
3009 type = build_function_type_list (void_type_node, | |
3010 objc_object_type, NULL_TREE); | |
3011 objc_enumeration_mutation_decl | |
3012 = add_builtin_function (TAG_ENUMERATION_MUTATION, type, 0, NOT_BUILT_IN, | |
3013 NULL, NULL_TREE); | |
3014 TREE_NOTHROW (objc_enumeration_mutation_decl) = 0; | |
3015 | |
3016 #ifdef OBJCPLUS | |
3017 pop_lang_context (); | |
3018 #endif | |
3019 | |
3020 write_symbols = save_write_symbols; | |
3021 debug_hooks = save_hooks; | |
3022 } | |
3023 | |
3024 /* --- const strings --- */ | |
3025 | |
3026 /* Ensure that the ivar list for NSConstantString/NXConstantString | |
3027 (or whatever was specified via `-fconstant-string-class') | |
3028 contains fields at least as large as the following three, so that | |
3029 the runtime can stomp on them with confidence: | |
3030 | |
3031 struct STRING_OBJECT_CLASS_NAME | |
3032 { | |
3033 Object isa; | |
3034 char *cString; | |
3035 unsigned int length; | |
3036 }; */ | |
3037 | |
3038 static int | |
3039 check_string_class_template (void) | |
3040 { | |
3041 tree field_decl = objc_get_class_ivars (constant_string_id); | |
3042 | |
3043 #define AT_LEAST_AS_LARGE_AS(F, T) \ | |
3044 (F && TREE_CODE (F) == FIELD_DECL \ | |
3045 && (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (F))) \ | |
3046 >= TREE_INT_CST_LOW (TYPE_SIZE (T)))) | |
3047 | |
3048 if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node)) | |
3049 return 0; | |
3050 | |
3051 field_decl = DECL_CHAIN (field_decl); | |
3052 if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node)) | |
3053 return 0; | |
3054 | |
3055 field_decl = DECL_CHAIN (field_decl); | |
3056 return AT_LEAST_AS_LARGE_AS (field_decl, unsigned_type_node); | |
3057 | |
3058 #undef AT_LEAST_AS_LARGE_AS | |
3059 } | |
3060 | |
3061 /* Avoid calling `check_string_class_template ()' more than once. */ | |
3062 static GTY(()) int string_layout_checked; | |
3063 | |
3064 /* Construct an internal string layout to be used as a template for | |
3065 creating NSConstantString/NXConstantString instances. */ | |
3066 | |
3067 static tree | |
3068 objc_build_internal_const_str_type (void) | |
3069 { | |
3070 tree type = (*lang_hooks.types.make_type) (RECORD_TYPE); | |
3071 tree fields = build_decl (input_location, | |
3072 FIELD_DECL, NULL_TREE, ptr_type_node); | |
3073 tree field = build_decl (input_location, | |
3074 FIELD_DECL, NULL_TREE, ptr_type_node); | |
3075 | |
3076 DECL_CHAIN (field) = fields; fields = field; | |
3077 field = build_decl (input_location, | |
3078 FIELD_DECL, NULL_TREE, unsigned_type_node); | |
3079 DECL_CHAIN (field) = fields; fields = field; | |
3080 /* NB: The finish_builtin_struct() routine expects FIELD_DECLs in | |
3081 reverse order! */ | |
3082 finish_builtin_struct (type, "__builtin_ObjCString", | |
3083 fields, NULL_TREE); | |
3084 | |
3085 return type; | |
3086 } | |
3087 | |
3088 /* Custom build_string which sets TREE_TYPE! */ | |
3089 | |
3090 tree | |
3091 my_build_string (int len, const char *str) | |
3092 { | |
3093 return fix_string_type (build_string (len, str)); | |
3094 } | |
3095 | |
3096 /* Build a string with contents STR and length LEN and convert it to a | |
3097 pointer. */ | |
3098 | |
3099 tree | |
3100 my_build_string_pointer (int len, const char *str) | |
3101 { | |
3102 tree string = my_build_string (len, str); | |
3103 tree ptrtype = build_pointer_type (TREE_TYPE (TREE_TYPE (string))); | |
3104 return build1 (ADDR_EXPR, ptrtype, string); | |
3105 } | |
3106 | |
3107 hashval_t | |
3108 objc_string_hasher::hash (string_descriptor *ptr) | |
3109 { | |
3110 const_tree const str = ptr->literal; | |
3111 const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str); | |
3112 int i, len = TREE_STRING_LENGTH (str); | |
3113 hashval_t h = len; | |
3114 | |
3115 for (i = 0; i < len; i++) | |
3116 h = ((h * 613) + p[i]); | |
3117 | |
3118 return h; | |
3119 } | |
3120 | |
3121 bool | |
3122 objc_string_hasher::equal (string_descriptor *ptr1, string_descriptor *ptr2) | |
3123 { | |
3124 const_tree const str1 = ptr1->literal; | |
3125 const_tree const str2 = ptr2->literal; | |
3126 int len1 = TREE_STRING_LENGTH (str1); | |
3127 | |
3128 return (len1 == TREE_STRING_LENGTH (str2) | |
3129 && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2), | |
3130 len1)); | |
3131 } | |
3132 | |
3133 /* Given a chain of STRING_CST's, build a static instance of | |
3134 NXConstantString which points at the concatenation of those | |
3135 strings. We place the string object in the __string_objects | |
3136 section of the __OBJC segment. The Objective-C runtime will | |
3137 initialize the isa pointers of the string objects to point at the | |
3138 NXConstantString class object. */ | |
3139 | |
3140 tree | |
3141 objc_build_string_object (tree string) | |
3142 { | |
3143 tree constant_string_class; | |
3144 int length; | |
3145 tree addr; | |
3146 struct string_descriptor *desc, key; | |
3147 | |
3148 /* We should be passed a STRING_CST. */ | |
3149 gcc_checking_assert (TREE_CODE (string) == STRING_CST); | |
3150 length = TREE_STRING_LENGTH (string) - 1; | |
3151 | |
3152 /* The target may have different ideas on how to construct an ObjC string | |
3153 literal. On Darwin (Mac OS X), for example, we may wish to obtain a | |
3154 constant CFString reference instead. | |
3155 At present, this is only supported for the NeXT runtime. */ | |
3156 if (flag_next_runtime | |
3157 && targetcm.objc_construct_string_object) | |
3158 { | |
3159 tree constructor = (*targetcm.objc_construct_string_object) (string); | |
3160 if (constructor) | |
3161 return build1 (NOP_EXPR, objc_object_type, constructor); | |
3162 } | |
3163 | |
3164 /* Check whether the string class being used actually exists and has the | |
3165 correct ivar layout. */ | |
3166 if (!string_layout_checked) | |
3167 { | |
3168 string_layout_checked = -1; | |
3169 constant_string_class = lookup_interface (constant_string_id); | |
3170 internal_const_str_type = objc_build_internal_const_str_type (); | |
3171 | |
3172 if (!constant_string_class | |
3173 || !(constant_string_type | |
3174 = CLASS_STATIC_TEMPLATE (constant_string_class))) | |
3175 error ("cannot find interface declaration for %qE", | |
3176 constant_string_id); | |
3177 /* The NSConstantString/NXConstantString ivar layout is now known. */ | |
3178 else if (!check_string_class_template ()) | |
3179 error ("interface %qE does not have valid constant string layout", | |
3180 constant_string_id); | |
3181 /* If the runtime can generate a literal reference to the string class, | |
3182 don't need to run a constructor. */ | |
3183 else if (!(*runtime.setup_const_string_class_decl)()) | |
3184 error ("cannot find reference tag for class %qE", constant_string_id); | |
3185 else | |
3186 { | |
3187 string_layout_checked = 1; /* Success! */ | |
3188 add_class_reference (constant_string_id); | |
3189 } | |
3190 } | |
3191 | |
3192 if (string_layout_checked == -1) | |
3193 return error_mark_node; | |
3194 | |
3195 /* Perhaps we already constructed a constant string just like this one? */ | |
3196 key.literal = string; | |
3197 string_descriptor **loc = string_htab->find_slot (&key, INSERT); | |
3198 desc = *loc; | |
3199 | |
3200 if (!desc) | |
3201 { | |
3202 *loc = desc = ggc_alloc<string_descriptor> (); | |
3203 desc->literal = string; | |
3204 desc->constructor = | |
3205 (*runtime.build_const_string_constructor) (input_location, string, length); | |
3206 } | |
3207 | |
3208 addr = convert (build_pointer_type (constant_string_type), | |
3209 build_unary_op (input_location, | |
3210 ADDR_EXPR, desc->constructor, 1)); | |
3211 | |
3212 return addr; | |
3213 } | |
3214 | |
3215 /* Build a static constant CONSTRUCTOR | |
3216 with type TYPE and elements ELTS. */ | |
3217 | |
3218 tree | |
3219 objc_build_constructor (tree type, vec<constructor_elt, va_gc> *elts) | |
3220 { | |
3221 tree constructor = build_constructor (type, elts); | |
3222 | |
3223 TREE_CONSTANT (constructor) = 1; | |
3224 TREE_STATIC (constructor) = 1; | |
3225 TREE_READONLY (constructor) = 1; | |
3226 | |
3227 #ifdef OBJCPLUS | |
3228 /* Adjust for impedance mismatch. We should figure out how to build | |
3229 CONSTRUCTORs that consistently please both the C and C++ gods. */ | |
3230 if (!(*elts)[0].index) | |
3231 TREE_TYPE (constructor) = init_list_type_node; | |
3232 #endif | |
3233 | |
3234 return constructor; | |
3235 } | |
3236 | |
3237 /* Return the DECL of the string IDENT in the SECTION. */ | |
3238 | |
3239 tree | |
3240 get_objc_string_decl (tree ident, enum string_section section) | |
3241 { | |
3242 tree chain; | |
3243 | |
3244 switch (section) | |
3245 { | |
3246 case class_names: | |
3247 chain = class_names_chain; | |
3248 break; | |
3249 case meth_var_names: | |
3250 chain = meth_var_names_chain; | |
3251 break; | |
3252 case meth_var_types: | |
3253 chain = meth_var_types_chain; | |
3254 break; | |
3255 case prop_names_attr: | |
3256 chain = prop_names_attr_chain; | |
3257 break; | |
3258 default: | |
3259 gcc_unreachable (); | |
3260 } | |
3261 | |
3262 for (; chain != 0; chain = TREE_CHAIN (chain)) | |
3263 if (TREE_VALUE (chain) == ident) | |
3264 return (TREE_PURPOSE (chain)); | |
3265 | |
3266 /* We didn't find the entry. */ | |
3267 return NULL_TREE; | |
3268 } | |
3269 | |
3270 /* Create a class reference, but don't create a variable to reference | |
3271 it. */ | |
3272 | |
3273 void | |
3274 add_class_reference (tree ident) | |
3275 { | |
3276 tree chain; | |
3277 | |
3278 if ((chain = cls_ref_chain)) | |
3279 { | |
3280 tree tail; | |
3281 do | |
3282 { | |
3283 if (ident == TREE_VALUE (chain)) | |
3284 return; | |
3285 | |
3286 tail = chain; | |
3287 chain = TREE_CHAIN (chain); | |
3288 } | |
3289 while (chain); | |
3290 | |
3291 /* Append to the end of the list */ | |
3292 TREE_CHAIN (tail) = tree_cons (NULL_TREE, ident, NULL_TREE); | |
3293 } | |
3294 else | |
3295 cls_ref_chain = tree_cons (NULL_TREE, ident, NULL_TREE); | |
3296 } | |
3297 | |
3298 /* Get a class reference, creating it if necessary. Also create the | |
3299 reference variable. */ | |
3300 tree | |
3301 objc_get_class_reference (tree ident) | |
3302 { | |
3303 tree orig_ident = (DECL_P (ident) | |
3304 ? DECL_NAME (ident) | |
3305 : TYPE_P (ident) | |
3306 ? OBJC_TYPE_NAME (ident) | |
3307 : ident); | |
3308 bool local_scope = false; | |
3309 | |
3310 #ifdef OBJCPLUS | |
3311 if (processing_template_decl) | |
3312 /* Must wait until template instantiation time. */ | |
3313 return build_min_nt_loc (UNKNOWN_LOCATION, CLASS_REFERENCE_EXPR, ident); | |
3314 #endif | |
3315 | |
3316 if (TREE_CODE (ident) == TYPE_DECL) | |
3317 ident = (DECL_ORIGINAL_TYPE (ident) | |
3318 ? DECL_ORIGINAL_TYPE (ident) | |
3319 : TREE_TYPE (ident)); | |
3320 | |
3321 #ifdef OBJCPLUS | |
3322 if (TYPE_P (ident) | |
3323 && CP_TYPE_CONTEXT (ident) != global_namespace) | |
3324 local_scope = true; | |
3325 #endif | |
3326 | |
3327 if (local_scope || !(ident = objc_is_class_name (ident))) | |
3328 { | |
3329 error ("%qE is not an Objective-C class name or alias", | |
3330 orig_ident); | |
3331 return error_mark_node; | |
3332 } | |
3333 | |
3334 return (*runtime.get_class_reference) (ident); | |
3335 } | |
3336 | |
3337 void | |
3338 objc_declare_alias (tree alias_ident, tree class_ident) | |
3339 { | |
3340 tree underlying_class; | |
3341 | |
3342 #ifdef OBJCPLUS | |
3343 if (current_namespace != global_namespace) { | |
3344 error ("Objective-C declarations may only appear in global scope"); | |
3345 } | |
3346 #endif /* OBJCPLUS */ | |
3347 | |
3348 if (!(underlying_class = objc_is_class_name (class_ident))) | |
3349 warning (0, "cannot find class %qE", class_ident); | |
3350 else if (objc_is_class_name (alias_ident)) | |
3351 warning (0, "class %qE already exists", alias_ident); | |
3352 else | |
3353 { | |
3354 /* Implement @compatibility_alias as a typedef. */ | |
3355 #ifdef OBJCPLUS | |
3356 push_lang_context (lang_name_c); /* extern "C" */ | |
3357 #endif | |
3358 lang_hooks.decls.pushdecl (build_decl | |
3359 (input_location, | |
3360 TYPE_DECL, | |
3361 alias_ident, | |
3362 xref_tag (RECORD_TYPE, underlying_class))); | |
3363 #ifdef OBJCPLUS | |
3364 pop_lang_context (); | |
3365 #endif | |
3366 objc_map_put (alias_name_map, alias_ident, underlying_class); | |
3367 } | |
3368 } | |
3369 | |
3370 void | |
3371 objc_declare_class (tree identifier) | |
3372 { | |
3373 #ifdef OBJCPLUS | |
3374 if (current_namespace != global_namespace) { | |
3375 error ("Objective-C declarations may only appear in global scope"); | |
3376 } | |
3377 #endif /* OBJCPLUS */ | |
3378 | |
3379 if (! objc_is_class_name (identifier)) | |
3380 { | |
3381 tree record = lookup_name (identifier), type = record; | |
3382 | |
3383 if (record) | |
3384 { | |
3385 if (TREE_CODE (record) == TYPE_DECL) | |
3386 type = DECL_ORIGINAL_TYPE (record) | |
3387 ? DECL_ORIGINAL_TYPE (record) | |
3388 : TREE_TYPE (record); | |
3389 | |
3390 if (!TYPE_HAS_OBJC_INFO (type) | |
3391 || !TYPE_OBJC_INTERFACE (type)) | |
3392 { | |
3393 error ("%qE redeclared as different kind of symbol", | |
3394 identifier); | |
3395 error ("previous declaration of %q+D", | |
3396 record); | |
3397 } | |
3398 } | |
3399 | |
3400 record = xref_tag (RECORD_TYPE, identifier); | |
3401 INIT_TYPE_OBJC_INFO (record); | |
3402 /* In the case of a @class declaration, we store the ident in | |
3403 the TYPE_OBJC_INTERFACE. If later an @interface is found, | |
3404 we'll replace the ident with the interface. */ | |
3405 TYPE_OBJC_INTERFACE (record) = identifier; | |
3406 objc_map_put (class_name_map, identifier, NULL_TREE); | |
3407 } | |
3408 } | |
3409 | |
3410 tree | |
3411 objc_is_class_name (tree ident) | |
3412 { | |
3413 if (ident && TREE_CODE (ident) == IDENTIFIER_NODE) | |
3414 { | |
3415 tree t = identifier_global_value (ident); | |
3416 if (t) | |
3417 ident = t; | |
3418 } | |
3419 | |
3420 while (ident && TREE_CODE (ident) == TYPE_DECL && DECL_ORIGINAL_TYPE (ident)) | |
3421 ident = OBJC_TYPE_NAME (DECL_ORIGINAL_TYPE (ident)); | |
3422 | |
3423 if (ident && TREE_CODE (ident) == RECORD_TYPE) | |
3424 ident = OBJC_TYPE_NAME (ident); | |
3425 #ifdef OBJCPLUS | |
3426 if (ident && TREE_CODE (ident) == TYPE_DECL) | |
3427 { | |
3428 tree type = TREE_TYPE (ident); | |
3429 if (type && TREE_CODE (type) == TEMPLATE_TYPE_PARM) | |
3430 return NULL_TREE; | |
3431 ident = DECL_NAME (ident); | |
3432 } | |
3433 #endif | |
3434 if (!ident || TREE_CODE (ident) != IDENTIFIER_NODE) | |
3435 return NULL_TREE; | |
3436 | |
3437 if (lookup_interface (ident)) | |
3438 return ident; | |
3439 | |
3440 { | |
3441 tree target; | |
3442 | |
3443 target = objc_map_get (class_name_map, ident); | |
3444 if (target != OBJC_MAP_NOT_FOUND) | |
3445 return ident; | |
3446 | |
3447 target = objc_map_get (alias_name_map, ident); | |
3448 if (target != OBJC_MAP_NOT_FOUND) | |
3449 return target; | |
3450 } | |
3451 | |
3452 return 0; | |
3453 } | |
3454 | |
3455 /* Check whether TYPE is either 'id' or 'Class'. */ | |
3456 | |
3457 tree | |
3458 objc_is_id (tree type) | |
3459 { | |
3460 if (type && TREE_CODE (type) == IDENTIFIER_NODE) | |
3461 { | |
3462 tree t = identifier_global_value (type); | |
3463 if (t) | |
3464 type = t; | |
3465 } | |
3466 | |
3467 if (type && TREE_CODE (type) == TYPE_DECL) | |
3468 type = TREE_TYPE (type); | |
3469 | |
3470 /* NB: This function may be called before the ObjC front-end has | |
3471 been initialized, in which case OBJC_OBJECT_TYPE will (still) be NULL. */ | |
3472 return (objc_object_type && type | |
3473 && (IS_ID (type) || IS_CLASS (type) || IS_SUPER (type)) | |
3474 ? type | |
3475 : NULL_TREE); | |
3476 } | |
3477 | |
3478 /* Check whether TYPE is either 'id', 'Class', or a pointer to an ObjC | |
3479 class instance. This is needed by other parts of the compiler to | |
3480 handle ObjC types gracefully. */ | |
3481 | |
3482 tree | |
3483 objc_is_object_ptr (tree type) | |
3484 { | |
3485 tree ret; | |
3486 | |
3487 type = TYPE_MAIN_VARIANT (type); | |
3488 if (!POINTER_TYPE_P (type)) | |
3489 return 0; | |
3490 | |
3491 ret = objc_is_id (type); | |
3492 if (!ret) | |
3493 ret = objc_is_class_name (TREE_TYPE (type)); | |
3494 | |
3495 return ret; | |
3496 } | |
3497 | |
3498 static int | |
3499 objc_is_gcable_type (tree type, int or_strong_p) | |
3500 { | |
3501 tree name; | |
3502 | |
3503 if (!TYPE_P (type)) | |
3504 return 0; | |
3505 if (objc_is_id (TYPE_MAIN_VARIANT (type))) | |
3506 return 1; | |
3507 if (or_strong_p && lookup_attribute ("objc_gc", TYPE_ATTRIBUTES (type))) | |
3508 return 1; | |
3509 if (TREE_CODE (type) != POINTER_TYPE && TREE_CODE (type) != INDIRECT_REF) | |
3510 return 0; | |
3511 type = TREE_TYPE (type); | |
3512 if (TREE_CODE (type) != RECORD_TYPE) | |
3513 return 0; | |
3514 name = TYPE_NAME (type); | |
3515 return (objc_is_class_name (name) != NULL_TREE); | |
3516 } | |
3517 | |
3518 static tree | |
3519 objc_substitute_decl (tree expr, tree oldexpr, tree newexpr) | |
3520 { | |
3521 if (expr == oldexpr) | |
3522 return newexpr; | |
3523 | |
3524 switch (TREE_CODE (expr)) | |
3525 { | |
3526 case COMPONENT_REF: | |
3527 return objc_build_component_ref | |
3528 (objc_substitute_decl (TREE_OPERAND (expr, 0), | |
3529 oldexpr, | |
3530 newexpr), | |
3531 DECL_NAME (TREE_OPERAND (expr, 1))); | |
3532 case ARRAY_REF: | |
3533 return build_array_ref (input_location, | |
3534 objc_substitute_decl (TREE_OPERAND (expr, 0), | |
3535 oldexpr, | |
3536 newexpr), | |
3537 TREE_OPERAND (expr, 1)); | |
3538 case INDIRECT_REF: | |
3539 return build_indirect_ref (input_location, | |
3540 objc_substitute_decl (TREE_OPERAND (expr, 0), | |
3541 oldexpr, | |
3542 newexpr), RO_ARROW); | |
3543 default: | |
3544 return expr; | |
3545 } | |
3546 } | |
3547 | |
3548 static tree | |
3549 objc_build_ivar_assignment (tree outervar, tree lhs, tree rhs) | |
3550 { | |
3551 tree func_params; | |
3552 /* The LHS parameter contains the expression 'outervar->memberspec'; | |
3553 we need to transform it into '&((typeof(outervar) *) 0)->memberspec', | |
3554 where memberspec may be arbitrarily complex (e.g., 'g->f.d[2].g[3]'). | |
3555 */ | |
3556 tree offs | |
3557 = objc_substitute_decl | |
3558 (lhs, outervar, convert (TREE_TYPE (outervar), integer_zero_node)); | |
3559 tree func | |
3560 = (flag_objc_direct_dispatch | |
3561 ? objc_assign_ivar_fast_decl | |
3562 : objc_assign_ivar_decl); | |
3563 | |
3564 offs = convert (integer_type_node, build_unary_op (input_location, | |
3565 ADDR_EXPR, offs, 0)); | |
3566 offs = fold (offs); | |
3567 func_params = tree_cons (NULL_TREE, | |
3568 convert (objc_object_type, rhs), | |
3569 tree_cons (NULL_TREE, convert (objc_object_type, outervar), | |
3570 tree_cons (NULL_TREE, offs, | |
3571 NULL_TREE))); | |
3572 | |
3573 return build_function_call (input_location, func, func_params); | |
3574 } | |
3575 | |
3576 static tree | |
3577 objc_build_global_assignment (tree lhs, tree rhs) | |
3578 { | |
3579 tree func_params = tree_cons (NULL_TREE, | |
3580 convert (objc_object_type, rhs), | |
3581 tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type), | |
3582 build_unary_op (input_location, ADDR_EXPR, lhs, 0)), | |
3583 NULL_TREE)); | |
3584 | |
3585 return build_function_call (input_location, | |
3586 objc_assign_global_decl, func_params); | |
3587 } | |
3588 | |
3589 static tree | |
3590 objc_build_strong_cast_assignment (tree lhs, tree rhs) | |
3591 { | |
3592 tree func_params = tree_cons (NULL_TREE, | |
3593 convert (objc_object_type, rhs), | |
3594 tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type), | |
3595 build_unary_op (input_location, ADDR_EXPR, lhs, 0)), | |
3596 NULL_TREE)); | |
3597 | |
3598 return build_function_call (input_location, | |
3599 objc_assign_strong_cast_decl, func_params); | |
3600 } | |
3601 | |
3602 static int | |
3603 objc_is_gcable_p (tree expr) | |
3604 { | |
3605 return (TREE_CODE (expr) == COMPONENT_REF | |
3606 ? objc_is_gcable_p (TREE_OPERAND (expr, 1)) | |
3607 : TREE_CODE (expr) == ARRAY_REF | |
3608 ? (objc_is_gcable_p (TREE_TYPE (expr)) | |
3609 || objc_is_gcable_p (TREE_OPERAND (expr, 0))) | |
3610 : TREE_CODE (expr) == ARRAY_TYPE | |
3611 ? objc_is_gcable_p (TREE_TYPE (expr)) | |
3612 : TYPE_P (expr) | |
3613 ? objc_is_gcable_type (expr, 1) | |
3614 : (objc_is_gcable_p (TREE_TYPE (expr)) | |
3615 || (DECL_P (expr) | |
3616 && lookup_attribute ("objc_gc", DECL_ATTRIBUTES (expr))))); | |
3617 } | |
3618 | |
3619 static int | |
3620 objc_is_ivar_reference_p (tree expr) | |
3621 { | |
3622 return (TREE_CODE (expr) == ARRAY_REF | |
3623 ? objc_is_ivar_reference_p (TREE_OPERAND (expr, 0)) | |
3624 : TREE_CODE (expr) == COMPONENT_REF | |
3625 ? TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL | |
3626 : 0); | |
3627 } | |
3628 | |
3629 static int | |
3630 objc_is_global_reference_p (tree expr) | |
3631 { | |
3632 return (TREE_CODE (expr) == INDIRECT_REF || TREE_CODE (expr) == PLUS_EXPR | |
3633 ? objc_is_global_reference_p (TREE_OPERAND (expr, 0)) | |
3634 : DECL_P (expr) | |
3635 ? (DECL_FILE_SCOPE_P (expr) || TREE_STATIC (expr)) | |
3636 : 0); | |
3637 } | |
3638 | |
3639 tree | |
3640 objc_generate_write_barrier (tree lhs, enum tree_code modifycode, tree rhs) | |
3641 { | |
3642 tree result = NULL_TREE, outer; | |
3643 int strong_cast_p = 0, outer_gc_p = 0, indirect_p = 0; | |
3644 | |
3645 /* This function is currently only used with the next runtime with | |
3646 garbage collection enabled (-fobjc-gc). */ | |
3647 gcc_assert (flag_next_runtime); | |
3648 | |
3649 /* See if we have any lhs casts, and strip them out. NB: The lvalue casts | |
3650 will have been transformed to the form '*(type *)&expr'. */ | |
3651 if (TREE_CODE (lhs) == INDIRECT_REF) | |
3652 { | |
3653 outer = TREE_OPERAND (lhs, 0); | |
3654 | |
3655 while (!strong_cast_p | |
3656 && (CONVERT_EXPR_P (outer) | |
3657 || TREE_CODE (outer) == NON_LVALUE_EXPR)) | |
3658 { | |
3659 tree lhstype = TREE_TYPE (outer); | |
3660 | |
3661 /* Descend down the cast chain, and record the first objc_gc | |
3662 attribute found. */ | |
3663 if (POINTER_TYPE_P (lhstype)) | |
3664 { | |
3665 tree attr | |
3666 = lookup_attribute ("objc_gc", | |
3667 TYPE_ATTRIBUTES (TREE_TYPE (lhstype))); | |
3668 | |
3669 if (attr) | |
3670 strong_cast_p = 1; | |
3671 } | |
3672 | |
3673 outer = TREE_OPERAND (outer, 0); | |
3674 } | |
3675 } | |
3676 | |
3677 /* If we have a __strong cast, it trumps all else. */ | |
3678 if (strong_cast_p) | |
3679 { | |
3680 if (modifycode != NOP_EXPR) | |
3681 goto invalid_pointer_arithmetic; | |
3682 | |
3683 if (warn_assign_intercept) | |
3684 warning (0, "strong-cast assignment has been intercepted"); | |
3685 | |
3686 result = objc_build_strong_cast_assignment (lhs, rhs); | |
3687 | |
3688 goto exit_point; | |
3689 } | |
3690 | |
3691 /* the lhs must be of a suitable type, regardless of its underlying | |
3692 structure. */ | |
3693 if (!objc_is_gcable_p (lhs)) | |
3694 goto exit_point; | |
3695 | |
3696 outer = lhs; | |
3697 | |
3698 while (outer | |
3699 && (TREE_CODE (outer) == COMPONENT_REF | |
3700 || TREE_CODE (outer) == ARRAY_REF)) | |
3701 outer = TREE_OPERAND (outer, 0); | |
3702 | |
3703 if (TREE_CODE (outer) == INDIRECT_REF) | |
3704 { | |
3705 outer = TREE_OPERAND (outer, 0); | |
3706 indirect_p = 1; | |
3707 } | |
3708 | |
3709 outer_gc_p = objc_is_gcable_p (outer); | |
3710 | |
3711 /* Handle ivar assignments. */ | |
3712 if (objc_is_ivar_reference_p (lhs)) | |
3713 { | |
3714 /* if the struct to the left of the ivar is not an Objective-C object (__strong | |
3715 doesn't cut it here), the best we can do here is suggest a cast. */ | |
3716 if (!objc_is_gcable_type (TREE_TYPE (outer), 0)) | |
3717 { | |
3718 /* We may still be able to use the global write barrier... */ | |
3719 if (!indirect_p && objc_is_global_reference_p (outer)) | |
3720 goto global_reference; | |
3721 | |
3722 suggest_cast: | |
3723 if (modifycode == NOP_EXPR) | |
3724 { | |
3725 if (warn_assign_intercept) | |
3726 warning (0, "strong-cast may possibly be needed"); | |
3727 } | |
3728 | |
3729 goto exit_point; | |
3730 } | |
3731 | |
3732 if (modifycode != NOP_EXPR) | |
3733 goto invalid_pointer_arithmetic; | |
3734 | |
3735 if (warn_assign_intercept) | |
3736 warning (0, "instance variable assignment has been intercepted"); | |
3737 | |
3738 result = objc_build_ivar_assignment (outer, lhs, rhs); | |
3739 | |
3740 goto exit_point; | |
3741 } | |
3742 | |
3743 /* Likewise, intercept assignment to global/static variables if their type is | |
3744 GC-marked. */ | |
3745 if (objc_is_global_reference_p (outer)) | |
3746 { | |
3747 if (indirect_p) | |
3748 goto suggest_cast; | |
3749 | |
3750 global_reference: | |
3751 if (modifycode != NOP_EXPR) | |
3752 { | |
3753 invalid_pointer_arithmetic: | |
3754 if (outer_gc_p) | |
3755 warning (0, "pointer arithmetic for garbage-collected objects not allowed"); | |
3756 | |
3757 goto exit_point; | |
3758 } | |
3759 | |
3760 if (warn_assign_intercept) | |
3761 warning (0, "global/static variable assignment has been intercepted"); | |
3762 | |
3763 result = objc_build_global_assignment (lhs, rhs); | |
3764 } | |
3765 | |
3766 /* In all other cases, fall back to the normal mechanism. */ | |
3767 exit_point: | |
3768 return result; | |
3769 } | |
3770 | |
3771 /* Implementation of the table mapping a class name (as an identifier) | |
3772 to a class node. The two public functions for it are | |
3773 lookup_interface() and add_interface(). add_interface() is only | |
3774 used in this file, so we can make it static. */ | |
3775 | |
3776 static GTY(()) objc_map_t interface_map; | |
3777 | |
3778 static void | |
3779 interface_hash_init (void) | |
3780 { | |
3781 interface_map = objc_map_alloc_ggc (200); | |
3782 } | |
3783 | |
3784 static tree | |
3785 add_interface (tree class_name, tree name) | |
3786 { | |
3787 /* Put interfaces on list in reverse order. */ | |
3788 TREE_CHAIN (class_name) = interface_chain; | |
3789 interface_chain = class_name; | |
3790 | |
3791 /* Add it to the map. */ | |
3792 objc_map_put (interface_map, name, class_name); | |
3793 | |
3794 return interface_chain; | |
3795 } | |
3796 | |
3797 tree | |
3798 lookup_interface (tree ident) | |
3799 { | |
3800 #ifdef OBJCPLUS | |
3801 if (ident && TREE_CODE (ident) == TYPE_DECL) | |
3802 ident = DECL_NAME (ident); | |
3803 #endif | |
3804 | |
3805 if (ident == NULL_TREE || TREE_CODE (ident) != IDENTIFIER_NODE) | |
3806 return NULL_TREE; | |
3807 | |
3808 { | |
3809 tree interface = objc_map_get (interface_map, ident); | |
3810 | |
3811 if (interface == OBJC_MAP_NOT_FOUND) | |
3812 return NULL_TREE; | |
3813 else | |
3814 return interface; | |
3815 } | |
3816 } | |
3817 | |
3818 | |
3819 | |
3820 /* Implement @defs (<classname>) within struct bodies. */ | |
3821 | |
3822 tree | |
3823 objc_get_class_ivars (tree class_name) | |
3824 { | |
3825 tree interface = lookup_interface (class_name); | |
3826 | |
3827 if (interface) | |
3828 return get_class_ivars (interface, true); | |
3829 | |
3830 error ("cannot find interface declaration for %qE", | |
3831 class_name); | |
3832 | |
3833 return error_mark_node; | |
3834 } | |
3835 | |
3836 | |
3837 /* Functions used by the hashtable for field duplicates in | |
3838 objc_detect_field_duplicates(). Ideally, we'd use a standard | |
3839 key-value dictionary hashtable , and store as keys the field names, | |
3840 and as values the actual declarations (used to print nice error | |
3841 messages with the locations). But, the hashtable we are using only | |
3842 allows us to store keys in the hashtable, without values (it looks | |
3843 more like a set). So, we store the DECLs, but define equality as | |
3844 DECLs having the same name, and hash as the hash of the name. */ | |
3845 | |
3846 struct decl_name_hash : nofree_ptr_hash <tree_node> | |
3847 { | |
3848 static inline hashval_t hash (const tree_node *); | |
3849 static inline bool equal (const tree_node *, const tree_node *); | |
3850 }; | |
3851 | |
3852 inline hashval_t | |
3853 decl_name_hash::hash (const tree_node *q) | |
3854 { | |
3855 return (hashval_t) ((intptr_t)(DECL_NAME (q)) >> 3); | |
3856 } | |
3857 | |
3858 inline bool | |
3859 decl_name_hash::equal (const tree_node *a, const tree_node *b) | |
3860 { | |
3861 return DECL_NAME (a) == DECL_NAME (b); | |
3862 } | |
3863 | |
3864 /* Called when checking the variables in a struct. If we are not | |
3865 doing the ivars list inside an @interface context, then return | |
3866 false. Else, perform the check for duplicate ivars, then return | |
3867 true. The check for duplicates checks if an instance variable with | |
3868 the same name exists in the class or in a superclass. If | |
3869 'check_superclasses_only' is set to true, then it is assumed that | |
3870 checks for instance variables in the same class has already been | |
3871 performed (this is the case for ObjC++) and only the instance | |
3872 variables of superclasses are checked. */ | |
3873 bool | |
3874 objc_detect_field_duplicates (bool check_superclasses_only) | |
3875 { | |
3876 if (!objc_collecting_ivars || !objc_interface_context | |
3877 || TREE_CODE (objc_interface_context) != CLASS_INTERFACE_TYPE) | |
3878 return false; | |
3879 | |
3880 /* We have two ways of doing this check: | |
3881 | |
3882 "direct comparison": we iterate over the instance variables and | |
3883 compare them directly. This works great for small numbers of | |
3884 instance variables (such as 10 or 20), which are extremely common. | |
3885 But it will potentially take forever for the pathological case with | |
3886 a huge number (eg, 10k) of instance variables. | |
3887 | |
3888 "hashtable": we use a hashtable, which requires a single sweep | |
3889 through the list of instances variables. This is much slower for a | |
3890 small number of variables, and we only use it for large numbers. | |
3891 | |
3892 To decide which one to use, we need to get an idea of how many | |
3893 instance variables we have to compare. */ | |
3894 { | |
3895 unsigned int number_of_ivars_to_check = 0; | |
3896 { | |
3897 tree ivar; | |
3898 for (ivar = CLASS_RAW_IVARS (objc_interface_context); | |
3899 ivar; ivar = DECL_CHAIN (ivar)) | |
3900 { | |
3901 /* Ignore anonymous ivars. */ | |
3902 if (DECL_NAME (ivar)) | |
3903 number_of_ivars_to_check++; | |
3904 } | |
3905 } | |
3906 | |
3907 /* Exit if there is nothing to do. */ | |
3908 if (number_of_ivars_to_check == 0) | |
3909 return true; | |
3910 | |
3911 /* In case that there are only 1 or 2 instance variables to check, | |
3912 we always use direct comparison. If there are more, it is | |
3913 worth iterating over the instance variables in the superclass | |
3914 to count how many there are (note that this has the same cost | |
3915 as checking 1 instance variable by direct comparison, which is | |
3916 why we skip this check in the case of 1 or 2 ivars and just do | |
3917 the direct comparison) and then decide if it worth using a | |
3918 hashtable. */ | |
3919 if (number_of_ivars_to_check > 2) | |
3920 { | |
3921 unsigned int number_of_superclass_ivars = 0; | |
3922 { | |
3923 tree interface; | |
3924 for (interface = lookup_interface (CLASS_SUPER_NAME (objc_interface_context)); | |
3925 interface; interface = lookup_interface (CLASS_SUPER_NAME (interface))) | |
3926 { | |
3927 tree ivar; | |
3928 for (ivar = CLASS_RAW_IVARS (interface); | |
3929 ivar; ivar = DECL_CHAIN (ivar)) | |
3930 number_of_superclass_ivars++; | |
3931 } | |
3932 } | |
3933 | |
3934 /* We use a hashtable if we have over 10k comparisons. */ | |
3935 if (number_of_ivars_to_check * (number_of_superclass_ivars | |
3936 + (number_of_ivars_to_check / 2)) | |
3937 > 10000) | |
3938 { | |
3939 /* First, build the hashtable by putting all the instance | |
3940 variables of superclasses in it. */ | |
3941 hash_table<decl_name_hash> htab (37); | |
3942 tree interface; | |
3943 for (interface = lookup_interface (CLASS_SUPER_NAME | |
3944 (objc_interface_context)); | |
3945 interface; interface = lookup_interface | |
3946 (CLASS_SUPER_NAME (interface))) | |
3947 { | |
3948 tree ivar; | |
3949 for (ivar = CLASS_RAW_IVARS (interface); ivar; | |
3950 ivar = DECL_CHAIN (ivar)) | |
3951 { | |
3952 if (DECL_NAME (ivar) != NULL_TREE) | |
3953 { | |
3954 tree_node **slot = htab.find_slot (ivar, INSERT); | |
3955 /* Do not check for duplicate instance | |
3956 variables in superclasses. Errors have | |
3957 already been generated. */ | |
3958 *slot = ivar; | |
3959 } | |
3960 } | |
3961 } | |
3962 | |
3963 /* Now, we go through all the instance variables in the | |
3964 class, and check that they are not in the | |
3965 hashtable. */ | |
3966 if (check_superclasses_only) | |
3967 { | |
3968 tree ivar; | |
3969 for (ivar = CLASS_RAW_IVARS (objc_interface_context); ivar; | |
3970 ivar = DECL_CHAIN (ivar)) | |
3971 { | |
3972 if (DECL_NAME (ivar) != NULL_TREE) | |
3973 { | |
3974 tree duplicate_ivar = htab.find (ivar); | |
3975 if (duplicate_ivar != HTAB_EMPTY_ENTRY) | |
3976 { | |
3977 error_at (DECL_SOURCE_LOCATION (ivar), | |
3978 "duplicate instance variable %q+D", | |
3979 ivar); | |
3980 inform (DECL_SOURCE_LOCATION (duplicate_ivar), | |
3981 "previous declaration of %q+D", | |
3982 duplicate_ivar); | |
3983 /* FIXME: Do we need the following ? */ | |
3984 /* DECL_NAME (ivar) = NULL_TREE; */ | |
3985 } | |
3986 } | |
3987 } | |
3988 } | |
3989 else | |
3990 { | |
3991 /* If we're checking for duplicates in the class as | |
3992 well, we insert variables in the hashtable as we | |
3993 check them, so if a duplicate follows, it will be | |
3994 caught. */ | |
3995 tree ivar; | |
3996 for (ivar = CLASS_RAW_IVARS (objc_interface_context); ivar; | |
3997 ivar = DECL_CHAIN (ivar)) | |
3998 { | |
3999 if (DECL_NAME (ivar) != NULL_TREE) | |
4000 { | |
4001 tree_node **slot = htab.find_slot (ivar, INSERT); | |
4002 if (*slot) | |
4003 { | |
4004 tree duplicate_ivar = (tree)(*slot); | |
4005 error_at (DECL_SOURCE_LOCATION (ivar), | |
4006 "duplicate instance variable %q+D", | |
4007 ivar); | |
4008 inform (DECL_SOURCE_LOCATION (duplicate_ivar), | |
4009 "previous declaration of %q+D", | |
4010 duplicate_ivar); | |
4011 /* FIXME: Do we need the following ? */ | |
4012 /* DECL_NAME (ivar) = NULL_TREE; */ | |
4013 } | |
4014 *slot = ivar; | |
4015 } | |
4016 } | |
4017 } | |
4018 return true; | |
4019 } | |
4020 } | |
4021 } | |
4022 | |
4023 /* This is the "direct comparison" approach, which is used in most | |
4024 non-pathological cases. */ | |
4025 { | |
4026 /* Walk up to class hierarchy, starting with this class (this is | |
4027 the external loop, because lookup_interface() is expensive, and | |
4028 we want to do it few times). */ | |
4029 tree interface = objc_interface_context; | |
4030 | |
4031 if (check_superclasses_only) | |
4032 interface = lookup_interface (CLASS_SUPER_NAME (interface)); | |
4033 | |
4034 for ( ; interface; interface = lookup_interface | |
4035 (CLASS_SUPER_NAME (interface))) | |
4036 { | |
4037 tree ivar_being_checked; | |
4038 | |
4039 for (ivar_being_checked = CLASS_RAW_IVARS (objc_interface_context); | |
4040 ivar_being_checked; | |
4041 ivar_being_checked = DECL_CHAIN (ivar_being_checked)) | |
4042 { | |
4043 tree decl; | |
4044 | |
4045 /* Ignore anonymous ivars. */ | |
4046 if (DECL_NAME (ivar_being_checked) == NULL_TREE) | |
4047 continue; | |
4048 | |
4049 /* Note how we stop when we find the ivar we are checking | |
4050 (this can only happen in the main class, not | |
4051 superclasses), to avoid comparing things twice | |
4052 (otherwise, for each ivar, you'd compare A to B then B | |
4053 to A, and get duplicated error messages). */ | |
4054 for (decl = CLASS_RAW_IVARS (interface); | |
4055 decl && decl != ivar_being_checked; | |
4056 decl = DECL_CHAIN (decl)) | |
4057 { | |
4058 if (DECL_NAME (ivar_being_checked) == DECL_NAME (decl)) | |
4059 { | |
4060 error_at (DECL_SOURCE_LOCATION (ivar_being_checked), | |
4061 "duplicate instance variable %q+D", | |
4062 ivar_being_checked); | |
4063 inform (DECL_SOURCE_LOCATION (decl), | |
4064 "previous declaration of %q+D", | |
4065 decl); | |
4066 /* FIXME: Do we need the following ? */ | |
4067 /* DECL_NAME (ivar_being_checked) = NULL_TREE; */ | |
4068 } | |
4069 } | |
4070 } | |
4071 } | |
4072 } | |
4073 return true; | |
4074 } | |
4075 | |
4076 /* Used by: build_private_template, continue_class, | |
4077 and for @defs constructs. */ | |
4078 | |
4079 static tree | |
4080 get_class_ivars (tree interface, bool inherited) | |
4081 { | |
4082 tree ivar_chain = copy_list (CLASS_RAW_IVARS (interface)); | |
4083 | |
4084 /* Both CLASS_RAW_IVARS and CLASS_IVARS contain a list of ivars declared | |
4085 by the current class (i.e., they do not include super-class ivars). | |
4086 However, the CLASS_IVARS list will be side-effected by a call to | |
4087 finish_struct(), which will fill in field offsets. */ | |
4088 if (!CLASS_IVARS (interface)) | |
4089 CLASS_IVARS (interface) = ivar_chain; | |
4090 | |
4091 if (!inherited) | |
4092 return ivar_chain; | |
4093 | |
4094 while (CLASS_SUPER_NAME (interface)) | |
4095 { | |
4096 /* Prepend super-class ivars. */ | |
4097 interface = lookup_interface (CLASS_SUPER_NAME (interface)); | |
4098 ivar_chain = chainon (copy_list (CLASS_RAW_IVARS (interface)), | |
4099 ivar_chain); | |
4100 } | |
4101 | |
4102 return ivar_chain; | |
4103 } | |
4104 | |
4105 void | |
4106 objc_maybe_warn_exceptions (location_t loc) | |
4107 { | |
4108 /* -fobjc-exceptions is required to enable Objective-C exceptions. | |
4109 For example, on Darwin, ObjC exceptions require a sufficiently | |
4110 recent version of the runtime, so the user must ask for them | |
4111 explicitly. On other platforms, at the moment -fobjc-exceptions | |
4112 triggers -fexceptions which again is required for exceptions to | |
4113 work. */ | |
4114 if (!flag_objc_exceptions) | |
4115 { | |
4116 /* Warn only once per compilation unit. */ | |
4117 static bool warned = false; | |
4118 | |
4119 if (!warned) | |
4120 { | |
4121 error_at (loc, "%<-fobjc-exceptions%> is required to enable Objective-C exception syntax"); | |
4122 warned = true; | |
4123 } | |
4124 } | |
4125 } | |
4126 | |
4127 static struct objc_try_context *cur_try_context; | |
4128 | |
4129 /* Called just after parsing the @try and its associated BODY. We now | |
4130 must prepare for the tricky bits -- handling the catches and finally. */ | |
4131 | |
4132 void | |
4133 objc_begin_try_stmt (location_t try_locus, tree body) | |
4134 { | |
4135 struct objc_try_context *c = XCNEW (struct objc_try_context); | |
4136 c->outer = cur_try_context; | |
4137 c->try_body = body; | |
4138 c->try_locus = try_locus; | |
4139 c->end_try_locus = input_location; | |
4140 cur_try_context = c; | |
4141 | |
4142 /* Collect the list of local variables. We'll mark them as volatile | |
4143 at the end of compilation of this function to prevent them being | |
4144 clobbered by setjmp/longjmp. */ | |
4145 if (flag_objc_sjlj_exceptions) | |
4146 objc_mark_locals_volatile (NULL); | |
4147 } | |
4148 | |
4149 /* Called just after parsing "@catch (parm)". Open a binding level, | |
4150 enter DECL into the binding level, and initialize it. Leave the | |
4151 binding level open while the body of the compound statement is | |
4152 parsed. If DECL is NULL_TREE, then we are compiling "@catch(...)" | |
4153 which we compile as "@catch(id tmp_variable)". */ | |
4154 | |
4155 void | |
4156 objc_begin_catch_clause (tree decl) | |
4157 { | |
4158 tree compound, type, t; | |
4159 bool ellipsis = false; | |
4160 | |
4161 /* Begin a new scope that the entire catch clause will live in. */ | |
4162 compound = c_begin_compound_stmt (true); | |
4163 | |
4164 /* Create the appropriate declaration for the argument. */ | |
4165 if (decl == error_mark_node) | |
4166 type = error_mark_node; | |
4167 else | |
4168 { | |
4169 if (decl == NULL_TREE) | |
4170 { | |
4171 /* If @catch(...) was specified, create a temporary variable of | |
4172 type 'id' and use it. */ | |
4173 decl = objc_create_temporary_var (objc_object_type, "__objc_generic_catch_var"); | |
4174 DECL_SOURCE_LOCATION (decl) = input_location; | |
4175 /* ... but allow the runtime to differentiate between ellipsis and the | |
4176 case of @catch (id xyz). */ | |
4177 ellipsis = true; | |
4178 } | |
4179 else | |
4180 { | |
4181 /* The parser passed in a PARM_DECL, but what we really want is a VAR_DECL. */ | |
4182 decl = build_decl (input_location, | |
4183 VAR_DECL, DECL_NAME (decl), TREE_TYPE (decl)); | |
4184 } | |
4185 lang_hooks.decls.pushdecl (decl); | |
4186 | |
4187 /* Mark the declaration as used so you never any warnings whether | |
4188 you use the exception argument or not. TODO: Implement a | |
4189 -Wunused-exception-parameter flag, which would cause warnings | |
4190 if exception parameter is not used. */ | |
4191 TREE_USED (decl) = 1; | |
4192 DECL_READ_P (decl) = 1; | |
4193 | |
4194 type = TREE_TYPE (decl); | |
4195 } | |
4196 | |
4197 /* Verify that the type of the catch is valid. It must be a pointer | |
4198 to an Objective-C class, or "id" (which is catch-all). */ | |
4199 if (type == error_mark_node) | |
4200 { | |
4201 ;/* Just keep going. */ | |
4202 } | |
4203 else if (!objc_type_valid_for_messaging (type, false)) | |
4204 { | |
4205 error ("@catch parameter is not a known Objective-C class type"); | |
4206 type = error_mark_node; | |
4207 } | |
4208 else if (TYPE_HAS_OBJC_INFO (TREE_TYPE (type)) | |
4209 && TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (type))) | |
4210 { | |
4211 error ("@catch parameter can not be protocol-qualified"); | |
4212 type = error_mark_node; | |
4213 } | |
4214 else if (POINTER_TYPE_P (type) && objc_is_object_id (TREE_TYPE (type))) | |
4215 /* @catch (id xyz) or @catch (...) but we note this for runtimes that | |
4216 identify 'id'. */ | |
4217 ; | |
4218 else | |
4219 { | |
4220 /* If 'type' was built using typedefs, we need to get rid of | |
4221 them and get a simple pointer to the class. */ | |
4222 bool is_typedef = false; | |
4223 tree x = TYPE_MAIN_VARIANT (type); | |
4224 | |
4225 /* Skip from the pointer to the pointee. */ | |
4226 if (TREE_CODE (x) == POINTER_TYPE) | |
4227 x = TREE_TYPE (x); | |
4228 | |
4229 /* Traverse typedef aliases */ | |
4230 while (TREE_CODE (x) == RECORD_TYPE && OBJC_TYPE_NAME (x) | |
4231 && TREE_CODE (OBJC_TYPE_NAME (x)) == TYPE_DECL | |
4232 && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (x))) | |
4233 { | |
4234 is_typedef = true; | |
4235 x = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (x)); | |
4236 } | |
4237 | |
4238 /* If it was a typedef, build a pointer to the final, original | |
4239 class. */ | |
4240 if (is_typedef) | |
4241 type = build_pointer_type (x); | |
4242 | |
4243 if (cur_try_context->catch_list) | |
4244 { | |
4245 /* Examine previous @catch clauses and see if we've already | |
4246 caught the type in question. */ | |
4247 tree_stmt_iterator i = tsi_start (cur_try_context->catch_list); | |
4248 for (; !tsi_end_p (i); tsi_next (&i)) | |
4249 { | |
4250 tree stmt = tsi_stmt (i); | |
4251 t = CATCH_TYPES (stmt); | |
4252 if (t == error_mark_node) | |
4253 continue; | |
4254 if (!t || DERIVED_FROM_P (TREE_TYPE (t), TREE_TYPE (type))) | |
4255 { | |
4256 warning (0, "exception of type %<%T%> will be caught", | |
4257 TREE_TYPE (type)); | |
4258 warning_at (EXPR_LOCATION (stmt), 0, " by earlier handler for %<%T%>", | |
4259 TREE_TYPE (t ? t : objc_object_type)); | |
4260 break; | |
4261 } | |
4262 } | |
4263 } | |
4264 } | |
4265 | |
4266 t = (*runtime.begin_catch) (&cur_try_context, type, decl, compound, ellipsis); | |
4267 add_stmt (t); | |
4268 } | |
4269 | |
4270 /* Called just after parsing the closing brace of a @catch clause. Close | |
4271 the open binding level, and record a CATCH_EXPR for it. */ | |
4272 | |
4273 void | |
4274 objc_finish_catch_clause (void) | |
4275 { | |
4276 tree c = cur_try_context->current_catch; | |
4277 cur_try_context->current_catch = NULL; | |
4278 cur_try_context->end_catch_locus = input_location; | |
4279 | |
4280 CATCH_BODY (c) = c_end_compound_stmt (input_location, CATCH_BODY (c), 1); | |
4281 | |
4282 (*runtime.finish_catch) (&cur_try_context, c); | |
4283 } | |
4284 | |
4285 /* Called after parsing a @finally clause and its associated BODY. | |
4286 Record the body for later placement. */ | |
4287 | |
4288 void | |
4289 objc_build_finally_clause (location_t finally_locus, tree body) | |
4290 { | |
4291 cur_try_context->finally_body = body; | |
4292 cur_try_context->finally_locus = finally_locus; | |
4293 cur_try_context->end_finally_locus = input_location; | |
4294 } | |
4295 | |
4296 /* Called to finalize a @try construct. */ | |
4297 | |
4298 tree | |
4299 objc_finish_try_stmt (void) | |
4300 { | |
4301 struct objc_try_context *c = cur_try_context; | |
4302 tree stmt; | |
4303 | |
4304 if (c->catch_list == NULL && c->finally_body == NULL) | |
4305 error ("%<@try%> without %<@catch%> or %<@finally%>"); | |
4306 | |
4307 stmt = (*runtime.finish_try_stmt) (&cur_try_context); | |
4308 add_stmt (stmt); | |
4309 | |
4310 cur_try_context = c->outer; | |
4311 free (c); | |
4312 return stmt; | |
4313 } | |
4314 | |
4315 tree | |
4316 objc_build_throw_stmt (location_t loc, tree throw_expr) | |
4317 { | |
4318 bool rethrown = false; | |
4319 | |
4320 objc_maybe_warn_exceptions (loc); | |
4321 | |
4322 /* Don't waste time trying to build something if we're already dead. */ | |
4323 if (throw_expr == error_mark_node) | |
4324 return error_mark_node; | |
4325 | |
4326 if (throw_expr == NULL) | |
4327 { | |
4328 /* If we're not inside a @catch block, there is no "current | |
4329 exception" to be rethrown. */ | |
4330 if (cur_try_context == NULL | |
4331 || cur_try_context->current_catch == NULL) | |
4332 { | |
4333 error_at (loc, "%<@throw%> (rethrow) used outside of a @catch block"); | |
4334 return error_mark_node; | |
4335 } | |
4336 | |
4337 /* Otherwise the object is still sitting in the EXC_PTR_EXPR | |
4338 value that we get from the runtime. */ | |
4339 throw_expr = (*runtime.build_exc_ptr) (&cur_try_context); | |
4340 rethrown = true; | |
4341 } | |
4342 else | |
4343 { | |
4344 if (!objc_type_valid_for_messaging (TREE_TYPE (throw_expr), true)) | |
4345 { | |
4346 error_at (loc, "%<@throw%> argument is not an object"); | |
4347 return error_mark_node; | |
4348 } | |
4349 } | |
4350 | |
4351 return (*runtime.build_throw_stmt) (loc, throw_expr, rethrown); | |
4352 } | |
4353 | |
4354 tree | |
4355 objc_build_synchronized (location_t start_locus, tree object_expr, tree body) | |
4356 { | |
4357 /* object_expr should never be NULL; but in case it is, convert it to | |
4358 error_mark_node. */ | |
4359 if (object_expr == NULL) | |
4360 object_expr = error_mark_node; | |
4361 | |
4362 /* Validate object_expr. If not valid, set it to error_mark_node. */ | |
4363 if (object_expr != error_mark_node) | |
4364 { | |
4365 if (!objc_type_valid_for_messaging (TREE_TYPE (object_expr), true)) | |
4366 { | |
4367 error_at (start_locus, "%<@synchronized%> argument is not an object"); | |
4368 object_expr = error_mark_node; | |
4369 } | |
4370 } | |
4371 | |
4372 if (object_expr == error_mark_node) | |
4373 { | |
4374 /* If we found an error, we simply ignore the '@synchronized'. | |
4375 Compile the body so we can keep going with minimal | |
4376 casualties. */ | |
4377 return add_stmt (body); | |
4378 } | |
4379 else | |
4380 { | |
4381 tree call; | |
4382 tree args; | |
4383 | |
4384 /* objc_sync_enter (object_expr); */ | |
4385 object_expr = save_expr (object_expr); | |
4386 args = tree_cons (NULL, object_expr, NULL); | |
4387 call = build_function_call (input_location, | |
4388 objc_sync_enter_decl, args); | |
4389 SET_EXPR_LOCATION (call, start_locus); | |
4390 add_stmt (call); | |
4391 | |
4392 /* Build "objc_sync_exit (object_expr);" but do not add it yet; | |
4393 it goes inside the @finalize() clause. */ | |
4394 args = tree_cons (NULL, object_expr, NULL); | |
4395 call = build_function_call (input_location, | |
4396 objc_sync_exit_decl, args); | |
4397 SET_EXPR_LOCATION (call, input_location); | |
4398 | |
4399 /* @try { body; } */ | |
4400 objc_begin_try_stmt (start_locus, body); | |
4401 | |
4402 /* @finally { objc_sync_exit (object_expr); } */ | |
4403 objc_build_finally_clause (input_location, call); | |
4404 | |
4405 /* End of try statement. */ | |
4406 return objc_finish_try_stmt (); | |
4407 } | |
4408 } | |
4409 | |
4410 /* Construct a C struct corresponding to ObjC class CLASS, with the same | |
4411 name as the class: | |
4412 | |
4413 struct <classname> { | |
4414 struct _objc_class *isa; | |
4415 ... | |
4416 }; */ | |
4417 | |
4418 static void | |
4419 build_private_template (tree klass) | |
4420 { | |
4421 if (!CLASS_STATIC_TEMPLATE (klass)) | |
4422 { | |
4423 tree record = objc_build_struct (klass, | |
4424 get_class_ivars (klass, false), | |
4425 CLASS_SUPER_NAME (klass)); | |
4426 | |
4427 /* Set the TREE_USED bit for this struct, so that stab generator | |
4428 can emit stabs for this struct type. */ | |
4429 if (flag_debug_only_used_symbols && TYPE_STUB_DECL (record)) | |
4430 TREE_USED (TYPE_STUB_DECL (record)) = 1; | |
4431 | |
4432 /* Copy the attributes from the class to the type. */ | |
4433 if (TREE_DEPRECATED (klass)) | |
4434 TREE_DEPRECATED (record) = 1; | |
4435 } | |
4436 } | |
4437 | |
4438 /* Generate either '- .cxx_construct' or '- .cxx_destruct' for the | |
4439 current class. */ | |
4440 #ifdef OBJCPLUS | |
4441 static void | |
4442 objc_generate_cxx_ctor_or_dtor (bool dtor) | |
4443 { | |
4444 tree fn, body, compound_stmt, ivar; | |
4445 | |
4446 /* - (id) .cxx_construct { ... return self; } */ | |
4447 /* - (void) .cxx_construct { ... } */ | |
4448 | |
4449 objc_start_method_definition | |
4450 (false /* is_class_method */, | |
4451 objc_build_method_signature (false /* is_class_method */, | |
4452 build_tree_list (NULL_TREE, | |
4453 dtor | |
4454 ? void_type_node | |
4455 : objc_object_type), | |
4456 get_identifier (dtor | |
4457 ? TAG_CXX_DESTRUCT | |
4458 : TAG_CXX_CONSTRUCT), | |
4459 make_node (TREE_LIST), | |
4460 false), NULL, NULL_TREE); | |
4461 body = begin_function_body (); | |
4462 compound_stmt = begin_compound_stmt (0); | |
4463 | |
4464 ivar = CLASS_IVARS (implementation_template); | |
4465 /* Destroy ivars in reverse order. */ | |
4466 if (dtor) | |
4467 ivar = nreverse (copy_list (ivar)); | |
4468 | |
4469 for (; ivar; ivar = TREE_CHAIN (ivar)) | |
4470 { | |
4471 if (TREE_CODE (ivar) == FIELD_DECL) | |
4472 { | |
4473 tree type = TREE_TYPE (ivar); | |
4474 | |
4475 /* Call the ivar's default constructor or destructor. Do not | |
4476 call the destructor unless a corresponding constructor call | |
4477 has also been made (or is not needed). */ | |
4478 if (MAYBE_CLASS_TYPE_P (type) | |
4479 && (dtor | |
4480 ? (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) | |
4481 && (!TYPE_NEEDS_CONSTRUCTING (type) | |
4482 || TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) | |
4483 : (TYPE_NEEDS_CONSTRUCTING (type) | |
4484 && TYPE_HAS_DEFAULT_CONSTRUCTOR (type)))) | |
4485 finish_expr_stmt | |
4486 (build_special_member_call | |
4487 (build_ivar_reference (DECL_NAME (ivar)), | |
4488 dtor ? complete_dtor_identifier : complete_ctor_identifier, | |
4489 NULL, type, LOOKUP_NORMAL, tf_warning_or_error)); | |
4490 } | |
4491 } | |
4492 | |
4493 /* The constructor returns 'self'. */ | |
4494 if (!dtor) | |
4495 finish_return_stmt (self_decl); | |
4496 | |
4497 finish_compound_stmt (compound_stmt); | |
4498 finish_function_body (body); | |
4499 fn = current_function_decl; | |
4500 finish_function (); | |
4501 objc_finish_method_definition (fn); | |
4502 } | |
4503 | |
4504 /* The following routine will examine the current @interface for any | |
4505 non-POD C++ ivars requiring non-trivial construction and/or | |
4506 destruction, and then synthesize special '- .cxx_construct' and/or | |
4507 '- .cxx_destruct' methods which will run the appropriate | |
4508 construction or destruction code. Note that ivars inherited from | |
4509 super-classes are _not_ considered. */ | |
4510 static void | |
4511 objc_generate_cxx_cdtors (void) | |
4512 { | |
4513 bool need_ctor = false, need_dtor = false; | |
4514 tree ivar; | |
4515 | |
4516 /* Error case, due to possibly an extra @end. */ | |
4517 if (!objc_implementation_context) | |
4518 return; | |
4519 | |
4520 /* We do not want to do this for categories, since they do not have | |
4521 their own ivars. */ | |
4522 | |
4523 if (TREE_CODE (objc_implementation_context) != CLASS_IMPLEMENTATION_TYPE) | |
4524 return; | |
4525 | |
4526 /* First, determine if we even need a constructor and/or destructor. */ | |
4527 | |
4528 for (ivar = CLASS_IVARS (implementation_template); ivar; | |
4529 ivar = TREE_CHAIN (ivar)) | |
4530 { | |
4531 if (TREE_CODE (ivar) == FIELD_DECL) | |
4532 { | |
4533 tree type = TREE_TYPE (ivar); | |
4534 | |
4535 if (MAYBE_CLASS_TYPE_P (type)) | |
4536 { | |
4537 if (TYPE_NEEDS_CONSTRUCTING (type) | |
4538 && TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) | |
4539 /* NB: If a default constructor is not available, we will not | |
4540 be able to initialize this ivar; the add_instance_variable() | |
4541 routine will already have warned about this. */ | |
4542 need_ctor = true; | |
4543 | |
4544 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) | |
4545 && (!TYPE_NEEDS_CONSTRUCTING (type) | |
4546 || TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) | |
4547 /* NB: If a default constructor is not available, we will not | |
4548 call the destructor either, for symmetry. */ | |
4549 need_dtor = true; | |
4550 } | |
4551 } | |
4552 } | |
4553 | |
4554 /* Generate '- .cxx_construct' if needed. */ | |
4555 | |
4556 if (need_ctor) | |
4557 objc_generate_cxx_ctor_or_dtor (false); | |
4558 | |
4559 /* Generate '- .cxx_destruct' if needed. */ | |
4560 | |
4561 if (need_dtor) | |
4562 objc_generate_cxx_ctor_or_dtor (true); | |
4563 | |
4564 /* The 'imp_list' variable points at an imp_entry record for the current | |
4565 @implementation. Record the existence of '- .cxx_construct' and/or | |
4566 '- .cxx_destruct' methods therein; it will be included in the | |
4567 metadata for the class if the runtime needs it. */ | |
4568 imp_list->has_cxx_cdtors = (need_ctor || need_dtor); | |
4569 } | |
4570 #endif | |
4571 | |
4572 static void | |
4573 error_with_ivar (const char *message, tree decl) | |
4574 { | |
4575 error_at (DECL_SOURCE_LOCATION (decl), "%s %qs", | |
4576 message, identifier_to_locale (gen_declaration (decl))); | |
4577 | |
4578 } | |
4579 | |
4580 static void | |
4581 check_ivars (tree inter, tree imp) | |
4582 { | |
4583 tree intdecls = CLASS_RAW_IVARS (inter); | |
4584 tree impdecls = CLASS_RAW_IVARS (imp); | |
4585 | |
4586 while (1) | |
4587 { | |
4588 tree t1, t2; | |
4589 | |
4590 #ifdef OBJCPLUS | |
4591 if (intdecls && TREE_CODE (intdecls) == TYPE_DECL) | |
4592 intdecls = TREE_CHAIN (intdecls); | |
4593 #endif | |
4594 if (intdecls == 0 && impdecls == 0) | |
4595 break; | |
4596 if (intdecls == 0 || impdecls == 0) | |
4597 { | |
4598 error ("inconsistent instance variable specification"); | |
4599 break; | |
4600 } | |
4601 | |
4602 t1 = TREE_TYPE (intdecls); t2 = TREE_TYPE (impdecls); | |
4603 | |
4604 if (!comptypes (t1, t2) | |
4605 #ifdef OBJCPLUS | |
4606 || !tree_int_cst_equal (DECL_BIT_FIELD_REPRESENTATIVE (intdecls), | |
4607 DECL_BIT_FIELD_REPRESENTATIVE (impdecls)) | |
4608 #else | |
4609 || !tree_int_cst_equal (DECL_INITIAL (intdecls), | |
4610 DECL_INITIAL (impdecls)) | |
4611 #endif | |
4612 ) | |
4613 { | |
4614 if (DECL_NAME (intdecls) == DECL_NAME (impdecls)) | |
4615 { | |
4616 error_with_ivar ("conflicting instance variable type", | |
4617 impdecls); | |
4618 error_with_ivar ("previous declaration of", | |
4619 intdecls); | |
4620 } | |
4621 else /* both the type and the name don't match */ | |
4622 { | |
4623 error ("inconsistent instance variable specification"); | |
4624 break; | |
4625 } | |
4626 } | |
4627 | |
4628 else if (DECL_NAME (intdecls) != DECL_NAME (impdecls)) | |
4629 { | |
4630 error_with_ivar ("conflicting instance variable name", | |
4631 impdecls); | |
4632 error_with_ivar ("previous declaration of", | |
4633 intdecls); | |
4634 } | |
4635 | |
4636 intdecls = DECL_CHAIN (intdecls); | |
4637 impdecls = DECL_CHAIN (impdecls); | |
4638 } | |
4639 } | |
4640 | |
4641 | |
4642 static void | |
4643 mark_referenced_methods (void) | |
4644 { | |
4645 struct imp_entry *impent; | |
4646 tree chain; | |
4647 | |
4648 for (impent = imp_list; impent; impent = impent->next) | |
4649 { | |
4650 chain = CLASS_CLS_METHODS (impent->imp_context); | |
4651 while (chain) | |
4652 { | |
4653 cgraph_node::get_create (METHOD_DEFINITION (chain))->mark_force_output (); | |
4654 chain = DECL_CHAIN (chain); | |
4655 } | |
4656 | |
4657 chain = CLASS_NST_METHODS (impent->imp_context); | |
4658 while (chain) | |
4659 { | |
4660 cgraph_node::get_create (METHOD_DEFINITION (chain))->mark_force_output (); | |
4661 chain = DECL_CHAIN (chain); | |
4662 } | |
4663 } | |
4664 } | |
4665 | |
4666 /* If type is empty or only type qualifiers are present, add default | |
4667 type of id (otherwise grokdeclarator will default to int). */ | |
4668 static inline tree | |
4669 adjust_type_for_id_default (tree type) | |
4670 { | |
4671 if (!type) | |
4672 type = make_node (TREE_LIST); | |
4673 | |
4674 if (!TREE_VALUE (type)) | |
4675 TREE_VALUE (type) = objc_object_type; | |
4676 else if (TREE_CODE (TREE_VALUE (type)) == RECORD_TYPE | |
4677 && TYPED_OBJECT (TREE_VALUE (type))) | |
4678 error ("can not use an object as parameter to a method"); | |
4679 | |
4680 return type; | |
4681 } | |
4682 | |
4683 /* Return a KEYWORD_DECL built using the specified key_name, arg_type, | |
4684 arg_name and attributes. (TODO: Rename KEYWORD_DECL to | |
4685 OBJC_METHOD_PARM_DECL ?) | |
4686 | |
4687 A KEYWORD_DECL is a tree representing the declaration of a | |
4688 parameter of an Objective-C method. It is produced when parsing a | |
4689 fragment of Objective-C method declaration of the form | |
4690 | |
4691 keyworddecl: | |
4692 selector ':' '(' typename ')' identifier | |
4693 | |
4694 For example, take the Objective-C method | |
4695 | |
4696 -(NSString *)pathForResource:(NSString *)resource ofType:(NSString *)type; | |
4697 | |
4698 the two fragments "pathForResource:(NSString *)resource" and | |
4699 "ofType:(NSString *)type" will generate a KEYWORD_DECL each. The | |
4700 KEYWORD_DECL stores the 'key_name' (eg, identifier for | |
4701 "pathForResource"), the 'arg_type' (eg, tree representing a | |
4702 NSString *), the 'arg_name' (eg identifier for "resource") and | |
4703 potentially some attributes (for example, a tree representing | |
4704 __attribute__ ((unused)) if such an attribute was attached to a | |
4705 certain parameter). You can access this information using the | |
4706 TREE_TYPE (for arg_type), KEYWORD_ARG_NAME (for arg_name), | |
4707 KEYWORD_KEY_NAME (for key_name), DECL_ATTRIBUTES (for attributes). | |
4708 | |
4709 'key_name' is an identifier node (and is optional as you can omit | |
4710 it in Objective-C methods). | |
4711 'arg_type' is a tree list (and is optional too if no parameter type | |
4712 was specified). | |
4713 'arg_name' is an identifier node and is required. | |
4714 'attributes' is an optional tree containing parameter attributes. */ | |
4715 tree | |
4716 objc_build_keyword_decl (tree key_name, tree arg_type, | |
4717 tree arg_name, tree attributes) | |
4718 { | |
4719 tree keyword_decl; | |
4720 | |
4721 if (flag_objc1_only && attributes) | |
4722 error_at (input_location, "method argument attributes are not available in Objective-C 1.0"); | |
4723 | |
4724 /* If no type is specified, default to "id". */ | |
4725 arg_type = adjust_type_for_id_default (arg_type); | |
4726 | |
4727 keyword_decl = make_node (KEYWORD_DECL); | |
4728 | |
4729 TREE_TYPE (keyword_decl) = arg_type; | |
4730 KEYWORD_ARG_NAME (keyword_decl) = arg_name; | |
4731 KEYWORD_KEY_NAME (keyword_decl) = key_name; | |
4732 DECL_ATTRIBUTES (keyword_decl) = attributes; | |
4733 | |
4734 return keyword_decl; | |
4735 } | |
4736 | |
4737 /* Given a chain of keyword_decl's, synthesize the full keyword selector. */ | |
4738 static tree | |
4739 build_keyword_selector (tree selector) | |
4740 { | |
4741 int len = 0; | |
4742 tree key_chain, key_name; | |
4743 char *buf; | |
4744 | |
4745 /* Scan the selector to see how much space we'll need. */ | |
4746 for (key_chain = selector; key_chain; key_chain = TREE_CHAIN (key_chain)) | |
4747 { | |
4748 switch (TREE_CODE (selector)) | |
4749 { | |
4750 case KEYWORD_DECL: | |
4751 key_name = KEYWORD_KEY_NAME (key_chain); | |
4752 break; | |
4753 case TREE_LIST: | |
4754 key_name = TREE_PURPOSE (key_chain); | |
4755 break; | |
4756 default: | |
4757 gcc_unreachable (); | |
4758 } | |
4759 | |
4760 if (key_name) | |
4761 len += IDENTIFIER_LENGTH (key_name) + 1; | |
4762 else | |
4763 /* Just a ':' arg. */ | |
4764 len++; | |
4765 } | |
4766 | |
4767 buf = (char *) alloca (len + 1); | |
4768 /* Start the buffer out as an empty string. */ | |
4769 buf[0] = '\0'; | |
4770 | |
4771 for (key_chain = selector; key_chain; key_chain = TREE_CHAIN (key_chain)) | |
4772 { | |
4773 switch (TREE_CODE (selector)) | |
4774 { | |
4775 case KEYWORD_DECL: | |
4776 key_name = KEYWORD_KEY_NAME (key_chain); | |
4777 break; | |
4778 case TREE_LIST: | |
4779 key_name = TREE_PURPOSE (key_chain); | |
4780 /* The keyword decl chain will later be used as a function | |
4781 argument chain. Unhook the selector itself so as to not | |
4782 confuse other parts of the compiler. */ | |
4783 TREE_PURPOSE (key_chain) = NULL_TREE; | |
4784 break; | |
4785 default: | |
4786 gcc_unreachable (); | |
4787 } | |
4788 | |
4789 if (key_name) | |
4790 strcat (buf, IDENTIFIER_POINTER (key_name)); | |
4791 strcat (buf, ":"); | |
4792 } | |
4793 | |
4794 return get_identifier_with_length (buf, len); | |
4795 } | |
4796 | |
4797 /* Used for declarations and definitions. */ | |
4798 | |
4799 static tree | |
4800 build_method_decl (enum tree_code code, tree ret_type, tree selector, | |
4801 tree add_args, bool ellipsis) | |
4802 { | |
4803 tree method_decl; | |
4804 | |
4805 /* If no type is specified, default to "id". */ | |
4806 ret_type = adjust_type_for_id_default (ret_type); | |
4807 | |
4808 /* Note how a method_decl has a TREE_TYPE which is not the function | |
4809 type of the function implementing the method, but only the return | |
4810 type of the method. We may want to change this, and store the | |
4811 entire function type in there (eg, it may be used to simplify | |
4812 dealing with attributes below). */ | |
4813 method_decl = make_node (code); | |
4814 TREE_TYPE (method_decl) = ret_type; | |
4815 | |
4816 /* If we have a keyword selector, create an identifier_node that | |
4817 represents the full selector name (`:' included)... */ | |
4818 if (TREE_CODE (selector) == KEYWORD_DECL) | |
4819 { | |
4820 METHOD_SEL_NAME (method_decl) = build_keyword_selector (selector); | |
4821 METHOD_SEL_ARGS (method_decl) = selector; | |
4822 METHOD_ADD_ARGS (method_decl) = add_args; | |
4823 METHOD_ADD_ARGS_ELLIPSIS_P (method_decl) = ellipsis; | |
4824 } | |
4825 else | |
4826 { | |
4827 METHOD_SEL_NAME (method_decl) = selector; | |
4828 METHOD_SEL_ARGS (method_decl) = NULL_TREE; | |
4829 METHOD_ADD_ARGS (method_decl) = NULL_TREE; | |
4830 } | |
4831 | |
4832 return method_decl; | |
4833 } | |
4834 | |
4835 /* This routine processes objective-c method attributes. */ | |
4836 | |
4837 static void | |
4838 objc_decl_method_attributes (tree *node, tree attributes, int flags) | |
4839 { | |
4840 /* TODO: Replace the hackery below. An idea would be to store the | |
4841 full function type in the method declaration (for example in | |
4842 TREE_TYPE) and then expose ObjC method declarations to c-family | |
4843 and they could deal with them by simply treating them as | |
4844 functions. */ | |
4845 | |
4846 /* Because of the dangers in the hackery below, we filter out any | |
4847 attribute that we do not know about. For the ones we know about, | |
4848 we know that they work with the hackery. For the other ones, | |
4849 there is no guarantee, so we have to filter them out. */ | |
4850 tree filtered_attributes = NULL_TREE; | |
4851 | |
4852 if (attributes) | |
4853 { | |
4854 tree attribute; | |
4855 for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) | |
4856 { | |
4857 tree name = TREE_PURPOSE (attribute); | |
4858 | |
4859 if (is_attribute_p ("deprecated", name) | |
4860 || is_attribute_p ("sentinel", name) | |
4861 || is_attribute_p ("noreturn", name)) | |
4862 { | |
4863 /* An attribute that we support; add it to the filtered | |
4864 attributes. */ | |
4865 filtered_attributes = chainon (filtered_attributes, | |
4866 copy_node (attribute)); | |
4867 } | |
4868 else if (is_attribute_p ("format", name)) | |
4869 { | |
4870 /* "format" is special because before adding it to the | |
4871 filtered attributes we need to adjust the specified | |
4872 format by adding the hidden function parameters for | |
4873 an Objective-C method (self, _cmd). */ | |
4874 tree new_attribute = copy_node (attribute); | |
4875 | |
4876 /* Check the arguments specified with the attribute, and | |
4877 modify them adding 2 for the two hidden arguments. | |
4878 Note how this differs from C++; according to the | |
4879 specs, C++ does not do it so you have to add the +1 | |
4880 yourself. For Objective-C, instead, the compiler | |
4881 adds the +2 for you. */ | |
4882 | |
4883 /* The attribute arguments have not been checked yet, so | |
4884 we need to be careful as they could be missing or | |
4885 invalid. If anything looks wrong, we skip the | |
4886 process and the compiler will complain about it later | |
4887 when it validates the attribute. */ | |
4888 /* Check that we have at least three arguments. */ | |
4889 if (TREE_VALUE (new_attribute) | |
4890 && TREE_CHAIN (TREE_VALUE (new_attribute)) | |
4891 && TREE_CHAIN (TREE_CHAIN (TREE_VALUE (new_attribute)))) | |
4892 { | |
4893 tree second_argument = TREE_CHAIN (TREE_VALUE (new_attribute)); | |
4894 tree third_argument = TREE_CHAIN (second_argument); | |
4895 tree number; | |
4896 | |
4897 /* This is the second argument, the "string-index", | |
4898 which specifies the index of the format string | |
4899 argument. Add 2. */ | |
4900 number = TREE_VALUE (second_argument); | |
4901 if (number | |
4902 && TREE_CODE (number) == INTEGER_CST | |
4903 && wi::to_wide (number) != 0) | |
4904 TREE_VALUE (second_argument) | |
4905 = wide_int_to_tree (TREE_TYPE (number), | |
4906 wi::to_wide (number) + 2); | |
4907 | |
4908 /* This is the third argument, the "first-to-check", | |
4909 which specifies the index of the first argument to | |
4910 check. This could be 0, meaning it is not available, | |
4911 in which case we don't need to add 2. Add 2 if not | |
4912 0. */ | |
4913 number = TREE_VALUE (third_argument); | |
4914 if (number | |
4915 && TREE_CODE (number) == INTEGER_CST | |
4916 && wi::to_wide (number) != 0) | |
4917 TREE_VALUE (third_argument) | |
4918 = wide_int_to_tree (TREE_TYPE (number), | |
4919 wi::to_wide (number) + 2); | |
4920 } | |
4921 filtered_attributes = chainon (filtered_attributes, | |
4922 new_attribute); | |
4923 } | |
4924 else if (is_attribute_p ("nonnull", name)) | |
4925 { | |
4926 /* We need to fixup all the argument indexes by adding 2 | |
4927 for the two hidden arguments of an Objective-C method | |
4928 invocation, similat to what we do above for the | |
4929 "format" attribute. */ | |
4930 /* FIXME: This works great in terms of implementing the | |
4931 functionality, but the warnings that are produced by | |
4932 nonnull do mention the argument index (while the | |
4933 format ones don't). For example, you could get | |
4934 "warning: null argument where non-null required | |
4935 (argument 3)". Now in that message, "argument 3" | |
4936 includes the 2 hidden arguments; it would be much | |
4937 more friendly to call it "argument 1", as that would | |
4938 be consistent with __attribute__ ((nonnnull (1))). | |
4939 To do this, we'd need to have the C family code that | |
4940 checks the arguments know about adding/removing 2 to | |
4941 the argument index ... or alternatively we could | |
4942 maybe store the "printable" argument index in | |
4943 addition to the actual argument index ? Some | |
4944 refactoring is needed to do this elegantly. */ | |
4945 tree new_attribute = copy_node (attribute); | |
4946 tree argument = TREE_VALUE (attribute); | |
4947 while (argument != NULL_TREE) | |
4948 { | |
4949 /* Get the value of the argument and add 2. */ | |
4950 tree number = TREE_VALUE (argument); | |
4951 if (number && TREE_CODE (number) == INTEGER_CST | |
4952 && wi::to_wide (number) != 0) | |
4953 TREE_VALUE (argument) | |
4954 = wide_int_to_tree (TREE_TYPE (number), | |
4955 wi::to_wide (number) + 2); | |
4956 argument = TREE_CHAIN (argument); | |
4957 } | |
4958 | |
4959 filtered_attributes = chainon (filtered_attributes, | |
4960 new_attribute); | |
4961 } | |
4962 else | |
4963 warning (OPT_Wattributes, "%qE attribute directive ignored", name); | |
4964 } | |
4965 } | |
4966 | |
4967 if (filtered_attributes) | |
4968 { | |
4969 /* This hackery changes the TREE_TYPE of the ObjC method | |
4970 declaration to be a function type, so that decl_attributes | |
4971 will treat the ObjC method as if it was a function. Some | |
4972 attributes (sentinel, format) will be applied to the function | |
4973 type, changing it in place; so after calling decl_attributes, | |
4974 we extract the function type attributes and store them in | |
4975 METHOD_TYPE_ATTRIBUTES. Some other attributes (noreturn, | |
4976 deprecated) are applied directly to the method declaration | |
4977 (by setting TREE_DEPRECATED and TREE_THIS_VOLATILE) so there | |
4978 is nothing to do. */ | |
4979 tree saved_type = TREE_TYPE (*node); | |
4980 TREE_TYPE (*node) | |
4981 = build_function_type_for_method (TREE_VALUE (saved_type), *node, | |
4982 METHOD_REF, 0); | |
4983 decl_attributes (node, filtered_attributes, flags); | |
4984 METHOD_TYPE_ATTRIBUTES (*node) = TYPE_ATTRIBUTES (TREE_TYPE (*node)); | |
4985 TREE_TYPE (*node) = saved_type; | |
4986 } | |
4987 } | |
4988 | |
4989 bool | |
4990 objc_method_decl (enum tree_code opcode) | |
4991 { | |
4992 return opcode == INSTANCE_METHOD_DECL || opcode == CLASS_METHOD_DECL; | |
4993 } | |
4994 | |
4995 /* Return a function type for METHOD with RETURN_TYPE. CONTEXT is | |
4996 either METHOD_DEF or METHOD_REF, indicating whether we are defining a | |
4997 method or calling one. SUPER_FLAG indicates whether this is a send | |
4998 to super; this makes a difference for the NeXT calling sequence in | |
4999 which the lookup and the method call are done together. If METHOD is | |
5000 NULL, user-defined arguments (i.e., beyond self and _cmd) shall be | |
5001 represented as varargs. */ | |
5002 | |
5003 tree | |
5004 build_function_type_for_method (tree return_type, tree method, | |
5005 int context, bool super_flag) | |
5006 { | |
5007 vec<tree, va_gc> *argtypes = make_tree_vector (); | |
5008 tree t, ftype; | |
5009 bool is_varargs = false; | |
5010 | |
5011 (*runtime.get_arg_type_list_base) (&argtypes, method, context, super_flag); | |
5012 | |
5013 /* No actual method prototype given; remaining args passed as varargs. */ | |
5014 if (method == NULL_TREE) | |
5015 { | |
5016 is_varargs = true; | |
5017 goto build_ftype; | |
5018 } | |
5019 | |
5020 for (t = METHOD_SEL_ARGS (method); t; t = DECL_CHAIN (t)) | |
5021 { | |
5022 tree arg_type = TREE_VALUE (TREE_TYPE (t)); | |
5023 | |
5024 /* Decay argument types for the underlying C function as | |
5025 appropriate. */ | |
5026 arg_type = objc_decay_parm_type (arg_type); | |
5027 | |
5028 vec_safe_push (argtypes, arg_type); | |
5029 } | |
5030 | |
5031 if (METHOD_ADD_ARGS (method)) | |
5032 { | |
5033 for (t = TREE_CHAIN (METHOD_ADD_ARGS (method)); | |
5034 t; t = TREE_CHAIN (t)) | |
5035 { | |
5036 tree arg_type = TREE_TYPE (TREE_VALUE (t)); | |
5037 | |
5038 arg_type = objc_decay_parm_type (arg_type); | |
5039 | |
5040 vec_safe_push (argtypes, arg_type); | |
5041 } | |
5042 | |
5043 if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) | |
5044 is_varargs = true; | |
5045 } | |
5046 | |
5047 build_ftype: | |
5048 if (is_varargs) | |
5049 ftype = build_varargs_function_type_vec (return_type, argtypes); | |
5050 else | |
5051 ftype = build_function_type_vec (return_type, argtypes); | |
5052 | |
5053 release_tree_vector (argtypes); | |
5054 return ftype; | |
5055 } | |
5056 | |
5057 /* The 'method' argument is a tree; this tree could either be a single | |
5058 method, which is returned, or could be a TREE_VEC containing a list | |
5059 of methods. In that case, the first one is returned, and warnings | |
5060 are issued as appropriate. */ | |
5061 static tree | |
5062 check_duplicates (tree method, int methods, int is_class) | |
5063 { | |
5064 tree first_method; | |
5065 size_t i; | |
5066 | |
5067 if (method == NULL_TREE) | |
5068 return NULL_TREE; | |
5069 | |
5070 if (TREE_CODE (method) != TREE_VEC) | |
5071 return method; | |
5072 | |
5073 /* We have two or more methods with the same name but different | |
5074 types. */ | |
5075 first_method = TREE_VEC_ELT (method, 0); | |
5076 | |
5077 /* But just how different are those types? If | |
5078 -Wno-strict-selector-match is specified, we shall not complain if | |
5079 the differences are solely among types with identical size and | |
5080 alignment. */ | |
5081 if (!warn_strict_selector_match) | |
5082 { | |
5083 for (i = 0; i < (size_t) TREE_VEC_LENGTH (method); i++) | |
5084 if (!comp_proto_with_proto (first_method, TREE_VEC_ELT (method, i), 0)) | |
5085 goto issue_warning; | |
5086 | |
5087 return first_method; | |
5088 } | |
5089 | |
5090 issue_warning: | |
5091 if (methods) | |
5092 { | |
5093 bool type = TREE_CODE (first_method) == INSTANCE_METHOD_DECL; | |
5094 | |
5095 warning_at (input_location, 0, | |
5096 "multiple methods named %<%c%E%> found", | |
5097 (is_class ? '+' : '-'), | |
5098 METHOD_SEL_NAME (first_method)); | |
5099 inform (DECL_SOURCE_LOCATION (first_method), "using %<%c%s%>", | |
5100 (type ? '-' : '+'), | |
5101 identifier_to_locale (gen_method_decl (first_method))); | |
5102 } | |
5103 else | |
5104 { | |
5105 bool type = TREE_CODE (first_method) == INSTANCE_METHOD_DECL; | |
5106 | |
5107 warning_at (input_location, 0, | |
5108 "multiple selectors named %<%c%E%> found", | |
5109 (is_class ? '+' : '-'), | |
5110 METHOD_SEL_NAME (first_method)); | |
5111 inform (DECL_SOURCE_LOCATION (first_method), "found %<%c%s%>", | |
5112 (type ? '-' : '+'), | |
5113 identifier_to_locale (gen_method_decl (first_method))); | |
5114 } | |
5115 | |
5116 for (i = 0; i < (size_t) TREE_VEC_LENGTH (method); i++) | |
5117 { | |
5118 bool type = TREE_CODE (TREE_VEC_ELT (method, i)) == INSTANCE_METHOD_DECL; | |
5119 | |
5120 inform (DECL_SOURCE_LOCATION (TREE_VEC_ELT (method, i)), "also found %<%c%s%>", | |
5121 (type ? '-' : '+'), | |
5122 identifier_to_locale (gen_method_decl (TREE_VEC_ELT (method, i)))); | |
5123 } | |
5124 | |
5125 return first_method; | |
5126 } | |
5127 | |
5128 /* If RECEIVER is a class reference, return the identifier node for | |
5129 the referenced class. RECEIVER is created by objc_get_class_reference, | |
5130 so we check the exact form created depending on which runtimes are | |
5131 used. */ | |
5132 | |
5133 static tree | |
5134 receiver_is_class_object (tree receiver, int self, int super) | |
5135 { | |
5136 tree exp, arg; | |
5137 | |
5138 /* The receiver is 'self' or 'super' in the context of a class method. */ | |
5139 if (objc_method_context | |
5140 && TREE_CODE (objc_method_context) == CLASS_METHOD_DECL | |
5141 && (self || super)) | |
5142 return (super | |
5143 ? CLASS_SUPER_NAME (implementation_template) | |
5144 : CLASS_NAME (implementation_template)); | |
5145 | |
5146 /* The runtime might encapsulate things its own way. */ | |
5147 exp = (*runtime.receiver_is_class_object) (receiver); | |
5148 if (exp) | |
5149 return exp; | |
5150 | |
5151 /* The receiver is a function call that returns an id. Check if | |
5152 it is a call to objc_getClass, if so, pick up the class name. | |
5153 | |
5154 This is required by the GNU runtime, which compiles | |
5155 | |
5156 [NSObject alloc] | |
5157 | |
5158 into | |
5159 | |
5160 [objc_get_class ("NSObject") alloc]; | |
5161 | |
5162 and then, to check that the receiver responds to the +alloc | |
5163 method, needs to be able to determine that the objc_get_class() | |
5164 call returns the NSObject class and not just a generic Class | |
5165 pointer. | |
5166 | |
5167 But, traditionally this is enabled for all runtimes, not just the | |
5168 GNU one, which means that the compiler is smarter than you'd | |
5169 expect when dealing with objc_getClass(). For example, with the | |
5170 Apple runtime, in the code | |
5171 | |
5172 [objc_getClass ("NSObject") alloc]; | |
5173 | |
5174 the compiler will recognize the objc_getClass() call as special | |
5175 (due to the code below) and so will know that +alloc is called on | |
5176 the 'NSObject' class, and can perform the corresponding checks. | |
5177 | |
5178 Programmers can disable this behavior by casting the results of | |
5179 objc_getClass() to 'Class' (this may seem weird because | |
5180 objc_getClass() is already declared to return 'Class', but the | |
5181 compiler treats it as a special function). This may be useful if | |
5182 the class is never declared, and the compiler would complain | |
5183 about a missing @interface for it. Then, you can do | |
5184 | |
5185 [(Class)objc_getClass ("MyClassNeverDeclared") alloc]; | |
5186 | |
5187 to silence the warnings. */ | |
5188 if (TREE_CODE (receiver) == CALL_EXPR | |
5189 && (exp = CALL_EXPR_FN (receiver)) | |
5190 && TREE_CODE (exp) == ADDR_EXPR | |
5191 && (exp = TREE_OPERAND (exp, 0)) | |
5192 && TREE_CODE (exp) == FUNCTION_DECL | |
5193 /* For some reason, we sometimes wind up with multiple FUNCTION_DECL | |
5194 prototypes for objc_get_class(). Thankfully, they seem to share the | |
5195 same function type. */ | |
5196 && TREE_TYPE (exp) == TREE_TYPE (objc_get_class_decl) | |
5197 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (exp)), runtime.tag_getclass) | |
5198 /* We have a call to objc_get_class/objc_getClass! */ | |
5199 && (arg = CALL_EXPR_ARG (receiver, 0))) | |
5200 { | |
5201 STRIP_NOPS (arg); | |
5202 if (TREE_CODE (arg) == ADDR_EXPR | |
5203 && (arg = TREE_OPERAND (arg, 0)) | |
5204 && TREE_CODE (arg) == STRING_CST) | |
5205 /* Finally, we have the class name. */ | |
5206 return get_identifier (TREE_STRING_POINTER (arg)); | |
5207 } | |
5208 return 0; | |
5209 } | |
5210 | |
5211 /* If we are currently building a message expr, this holds | |
5212 the identifier of the selector of the message. This is | |
5213 used when printing warnings about argument mismatches. */ | |
5214 | |
5215 static tree current_objc_message_selector = 0; | |
5216 | |
5217 tree | |
5218 objc_message_selector (void) | |
5219 { | |
5220 return current_objc_message_selector; | |
5221 } | |
5222 | |
5223 /* Construct an expression for sending a message. | |
5224 MESS has the object to send to in TREE_PURPOSE | |
5225 and the argument list (including selector) in TREE_VALUE. | |
5226 | |
5227 (*(<abstract_decl>(*)())_msg)(receiver, selTransTbl[n], ...); | |
5228 (*(<abstract_decl>(*)())_msgSuper)(receiver, selTransTbl[n], ...); */ | |
5229 | |
5230 tree | |
5231 objc_build_message_expr (tree receiver, tree message_args) | |
5232 { | |
5233 tree sel_name; | |
5234 #ifdef OBJCPLUS | |
5235 tree args = TREE_PURPOSE (message_args); | |
5236 #else | |
5237 tree args = message_args; | |
5238 #endif | |
5239 tree method_params = NULL_TREE; | |
5240 | |
5241 if (TREE_CODE (receiver) == ERROR_MARK || TREE_CODE (args) == ERROR_MARK) | |
5242 return error_mark_node; | |
5243 | |
5244 /* Obtain the full selector name. */ | |
5245 switch (TREE_CODE (args)) | |
5246 { | |
5247 case IDENTIFIER_NODE: | |
5248 /* A unary selector. */ | |
5249 sel_name = args; | |
5250 break; | |
5251 case TREE_LIST: | |
5252 sel_name = build_keyword_selector (args); | |
5253 break; | |
5254 default: | |
5255 gcc_unreachable (); | |
5256 } | |
5257 | |
5258 /* Build the parameter list to give to the method. */ | |
5259 if (TREE_CODE (args) == TREE_LIST) | |
5260 #ifdef OBJCPLUS | |
5261 method_params = chainon (args, TREE_VALUE (message_args)); | |
5262 #else | |
5263 { | |
5264 tree chain = args, prev = NULL_TREE; | |
5265 | |
5266 /* We have a keyword selector--check for comma expressions. */ | |
5267 while (chain) | |
5268 { | |
5269 tree element = TREE_VALUE (chain); | |
5270 | |
5271 /* We have a comma expression, must collapse... */ | |
5272 if (TREE_CODE (element) == TREE_LIST) | |
5273 { | |
5274 if (prev) | |
5275 TREE_CHAIN (prev) = element; | |
5276 else | |
5277 args = element; | |
5278 } | |
5279 prev = chain; | |
5280 chain = TREE_CHAIN (chain); | |
5281 } | |
5282 method_params = args; | |
5283 } | |
5284 #endif | |
5285 | |
5286 #ifdef OBJCPLUS | |
5287 if (processing_template_decl) | |
5288 /* Must wait until template instantiation time. */ | |
5289 return build_min_nt_loc (UNKNOWN_LOCATION, MESSAGE_SEND_EXPR, receiver, | |
5290 sel_name, method_params); | |
5291 #endif | |
5292 | |
5293 return objc_finish_message_expr (receiver, sel_name, method_params, NULL); | |
5294 } | |
5295 | |
5296 /* Look up method SEL_NAME that would be suitable for receiver | |
5297 of type 'id' (if IS_CLASS is zero) or 'Class' (if IS_CLASS is | |
5298 nonzero), and report on any duplicates. */ | |
5299 | |
5300 static tree | |
5301 lookup_method_in_hash_lists (tree sel_name, int is_class) | |
5302 { | |
5303 tree method_prototype = OBJC_MAP_NOT_FOUND; | |
5304 | |
5305 if (!is_class) | |
5306 method_prototype = objc_map_get (instance_method_map, sel_name); | |
5307 | |
5308 if (method_prototype == OBJC_MAP_NOT_FOUND) | |
5309 { | |
5310 method_prototype = objc_map_get (class_method_map, sel_name); | |
5311 is_class = 1; | |
5312 | |
5313 if (method_prototype == OBJC_MAP_NOT_FOUND) | |
5314 return NULL_TREE; | |
5315 } | |
5316 | |
5317 return check_duplicates (method_prototype, 1, is_class); | |
5318 } | |
5319 | |
5320 /* The 'objc_finish_message_expr' routine is called from within | |
5321 'objc_build_message_expr' for non-template functions. In the case of | |
5322 C++ template functions, it is called from 'build_expr_from_tree' | |
5323 (in decl2.c) after RECEIVER and METHOD_PARAMS have been expanded. | |
5324 | |
5325 If the DEPRECATED_METHOD_PROTOTYPE argument is NULL, then we warn | |
5326 if the method being used is deprecated. If it is not NULL, instead | |
5327 of deprecating, we set *DEPRECATED_METHOD_PROTOTYPE to the method | |
5328 prototype that was used and is deprecated. This is useful for | |
5329 getter calls that are always generated when compiling dot-syntax | |
5330 expressions, even if they may not be used. In that case, we don't | |
5331 want the warning immediately; we produce it (if needed) at gimplify | |
5332 stage when we are sure that the deprecated getter is being | |
5333 used. */ | |
5334 tree | |
5335 objc_finish_message_expr (tree receiver, tree sel_name, tree method_params, | |
5336 tree *deprecated_method_prototype) | |
5337 { | |
5338 tree method_prototype = NULL_TREE, rprotos = NULL_TREE, rtype; | |
5339 tree retval, class_tree; | |
5340 int self, super, have_cast; | |
5341 | |
5342 /* We have used the receiver, so mark it as read. */ | |
5343 mark_exp_read (receiver); | |
5344 | |
5345 /* Extract the receiver of the message, as well as its type | |
5346 (where the latter may take the form of a cast or be inferred | |
5347 from the implementation context). */ | |
5348 rtype = receiver; | |
5349 while (TREE_CODE (rtype) == COMPOUND_EXPR | |
5350 || TREE_CODE (rtype) == MODIFY_EXPR | |
5351 || CONVERT_EXPR_P (rtype) | |
5352 || TREE_CODE (rtype) == COMPONENT_REF) | |
5353 rtype = TREE_OPERAND (rtype, 0); | |
5354 | |
5355 /* self is 1 if this is a message to self, 0 otherwise */ | |
5356 self = (rtype == self_decl); | |
5357 | |
5358 /* super is 1 if this is a message to super, 0 otherwise. */ | |
5359 super = (rtype == UOBJC_SUPER_decl); | |
5360 | |
5361 /* rtype is the type of the receiver. */ | |
5362 rtype = TREE_TYPE (receiver); | |
5363 | |
5364 /* have_cast is 1 if the receiver is casted. */ | |
5365 have_cast = (TREE_CODE (receiver) == NOP_EXPR | |
5366 || (TREE_CODE (receiver) == COMPOUND_EXPR | |
5367 && !IS_SUPER (rtype))); | |
5368 | |
5369 /* If we are calling [super dealloc], reset our warning flag. */ | |
5370 if (super && !strcmp ("dealloc", IDENTIFIER_POINTER (sel_name))) | |
5371 should_call_super_dealloc = 0; | |
5372 | |
5373 /* If the receiver is a class object, retrieve the corresponding | |
5374 @interface, if one exists. class_tree is the class name | |
5375 identifier, or NULL_TREE if this is not a class method or the | |
5376 class name could not be determined (as in the case "Class c; [c | |
5377 method];"). */ | |
5378 class_tree = receiver_is_class_object (receiver, self, super); | |
5379 | |
5380 /* Now determine the receiver type (if an explicit cast has not been | |
5381 provided). */ | |
5382 if (!have_cast) | |
5383 { | |
5384 if (class_tree) | |
5385 { | |
5386 /* We are here when we have no cast, and we have a class | |
5387 name. So, this is a plain method to a class object, as | |
5388 in [NSObject alloc]. Find the interface corresponding to | |
5389 the class name. */ | |
5390 rtype = lookup_interface (class_tree); | |
5391 | |
5392 if (rtype == NULL_TREE) | |
5393 { | |
5394 /* If 'rtype' is NULL_TREE at this point it means that | |
5395 we have seen no @interface corresponding to that | |
5396 class name, only a @class declaration (alternatively, | |
5397 this was a call such as [objc_getClass("SomeClass") | |
5398 alloc], where we've never seen the @interface of | |
5399 SomeClass). So, we have a class name (class_tree) | |
5400 but no actual details of the class methods. We won't | |
5401 be able to check that the class responds to the | |
5402 method, and we will have to guess the method | |
5403 prototype. Emit a warning, then keep going (this | |
5404 will use any method with a matching name, as if the | |
5405 receiver was of type 'Class'). */ | |
5406 warning (0, "@interface of class %qE not found", class_tree); | |
5407 } | |
5408 } | |
5409 /* Handle `self' and `super'. */ | |
5410 else if (super) | |
5411 { | |
5412 if (!CLASS_SUPER_NAME (implementation_template)) | |
5413 { | |
5414 error ("no super class declared in @interface for %qE", | |
5415 CLASS_NAME (implementation_template)); | |
5416 return error_mark_node; | |
5417 } | |
5418 rtype = lookup_interface (CLASS_SUPER_NAME (implementation_template)); | |
5419 } | |
5420 else if (self) | |
5421 rtype = lookup_interface (CLASS_NAME (implementation_template)); | |
5422 } | |
5423 | |
5424 if (objc_is_id (rtype)) | |
5425 { | |
5426 /* The receiver is of type 'id' or 'Class' (with or without some | |
5427 protocols attached to it). */ | |
5428 | |
5429 /* We set class_tree to the identifier for 'Class' if this is a | |
5430 class method, and to NULL_TREE if not. */ | |
5431 class_tree = (IS_CLASS (rtype) ? objc_class_name : NULL_TREE); | |
5432 | |
5433 /* 'rprotos' is the list of protocols that the receiver | |
5434 supports. */ | |
5435 rprotos = (TYPE_HAS_OBJC_INFO (TREE_TYPE (rtype)) | |
5436 ? TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (rtype)) | |
5437 : NULL_TREE); | |
5438 | |
5439 /* We have no information on the type, and we set it to | |
5440 NULL_TREE. */ | |
5441 rtype = NULL_TREE; | |
5442 | |
5443 /* If there are any protocols, check that the method we are | |
5444 calling appears in the protocol list. If there are no | |
5445 protocols, this is a message to 'id' or 'Class' and we accept | |
5446 any method that exists. */ | |
5447 if (rprotos) | |
5448 { | |
5449 /* If messaging 'id <Protos>' or 'Class <Proto>', first | |
5450 search in protocols themselves for the method | |
5451 prototype. */ | |
5452 method_prototype | |
5453 = lookup_method_in_protocol_list (rprotos, sel_name, | |
5454 class_tree != NULL_TREE); | |
5455 | |
5456 /* If messaging 'Class <Proto>' but did not find a class | |
5457 method prototype, search for an instance method instead, | |
5458 and warn about having done so. */ | |
5459 if (!method_prototype && !rtype && class_tree != NULL_TREE) | |
5460 { | |
5461 method_prototype | |
5462 = lookup_method_in_protocol_list (rprotos, sel_name, 0); | |
5463 | |
5464 if (method_prototype) | |
5465 warning (0, "found %<-%E%> instead of %<+%E%> in protocol(s)", | |
5466 sel_name, sel_name); | |
5467 } | |
5468 } | |
5469 } | |
5470 else if (rtype) | |
5471 { | |
5472 /* We have a receiver type which is more specific than 'id' or | |
5473 'Class'. */ | |
5474 tree orig_rtype = rtype; | |
5475 | |
5476 if (TREE_CODE (rtype) == POINTER_TYPE) | |
5477 rtype = TREE_TYPE (rtype); | |
5478 /* Traverse typedef aliases */ | |
5479 while (TREE_CODE (rtype) == RECORD_TYPE && OBJC_TYPE_NAME (rtype) | |
5480 && TREE_CODE (OBJC_TYPE_NAME (rtype)) == TYPE_DECL | |
5481 && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (rtype))) | |
5482 rtype = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (rtype)); | |
5483 if (TYPED_OBJECT (rtype)) | |
5484 { | |
5485 rprotos = TYPE_OBJC_PROTOCOL_LIST (rtype); | |
5486 rtype = TYPE_OBJC_INTERFACE (rtype); | |
5487 } | |
5488 if (!rtype || TREE_CODE (rtype) == IDENTIFIER_NODE) | |
5489 { | |
5490 /* If we could not find an @interface declaration, we must | |
5491 have only seen a @class declaration; so, we cannot say | |
5492 anything more intelligent about which methods the | |
5493 receiver will understand. Note that this only happens | |
5494 for instance methods; for class methods to a class where | |
5495 we have only seen a @class declaration, | |
5496 lookup_interface() above would have set rtype to | |
5497 NULL_TREE. */ | |
5498 if (rprotos) | |
5499 { | |
5500 /* We could not find an @interface declaration, yet, if | |
5501 there are protocols attached to the type, we can | |
5502 still look up the method in the protocols. Ie, we | |
5503 are in the following case: | |
5504 | |
5505 @class MyClass; | |
5506 MyClass<MyProtocol> *x; | |
5507 [x method]; | |
5508 | |
5509 If 'MyProtocol' has the method 'method', we can check | |
5510 and retrieve the method prototype. */ | |
5511 method_prototype | |
5512 = lookup_method_in_protocol_list (rprotos, sel_name, 0); | |
5513 | |
5514 /* At this point, if we have found the method_prototype, | |
5515 we are quite happy. The details of the class are | |
5516 irrelevant. If we haven't found it, a warning will | |
5517 have been produced that the method could not be found | |
5518 in the protocol, and we won't produce further | |
5519 warnings (please note that this means that "@class | |
5520 MyClass; MyClass <MyProtocol> *x;" is exactly | |
5521 equivalent to "id <MyProtocol> x", which isn't too | |
5522 satisfactory but it's not easy to see how to do | |
5523 better). */ | |
5524 } | |
5525 else | |
5526 { | |
5527 if (rtype) | |
5528 { | |
5529 /* We could not find an @interface declaration, and | |
5530 there are no protocols attached to the receiver, | |
5531 so we can't complete the check that the receiver | |
5532 responds to the method, and we can't retrieve the | |
5533 method prototype. But, because the receiver has | |
5534 a well-specified class, the programmer did want | |
5535 this check to be performed. Emit a warning, then | |
5536 keep going as if it was an 'id'. To remove the | |
5537 warning, either include an @interface for the | |
5538 class, or cast the receiver to 'id'. Note that | |
5539 rtype is an IDENTIFIER_NODE at this point. */ | |
5540 warning (0, "@interface of class %qE not found", rtype); | |
5541 } | |
5542 } | |
5543 | |
5544 rtype = NULL_TREE; | |
5545 } | |
5546 else if (TREE_CODE (rtype) == CLASS_INTERFACE_TYPE | |
5547 || TREE_CODE (rtype) == CLASS_IMPLEMENTATION_TYPE) | |
5548 { | |
5549 /* We have a valid ObjC class name with an associated | |
5550 @interface. Look up the method name in the published | |
5551 @interface for the class (and its superclasses). */ | |
5552 method_prototype | |
5553 = lookup_method_static (rtype, sel_name, class_tree != NULL_TREE); | |
5554 | |
5555 /* If the method was not found in the @interface, it may still | |
5556 exist locally as part of the @implementation. */ | |
5557 if (!method_prototype && objc_implementation_context | |
5558 && CLASS_NAME (objc_implementation_context) | |
5559 == OBJC_TYPE_NAME (rtype)) | |
5560 method_prototype | |
5561 = lookup_method | |
5562 ((class_tree | |
5563 ? CLASS_CLS_METHODS (objc_implementation_context) | |
5564 : CLASS_NST_METHODS (objc_implementation_context)), | |
5565 sel_name); | |
5566 | |
5567 /* If we haven't found a candidate method by now, try looking for | |
5568 it in the protocol list. */ | |
5569 if (!method_prototype && rprotos) | |
5570 method_prototype | |
5571 = lookup_method_in_protocol_list (rprotos, sel_name, | |
5572 class_tree != NULL_TREE); | |
5573 } | |
5574 else | |
5575 { | |
5576 /* We have a type, but it's not an Objective-C type (!). */ | |
5577 warning (0, "invalid receiver type %qs", | |
5578 identifier_to_locale (gen_type_name (orig_rtype))); | |
5579 /* After issuing the "invalid receiver" warning, perform method | |
5580 lookup as if we were messaging 'id'. */ | |
5581 rtype = rprotos = NULL_TREE; | |
5582 } | |
5583 } | |
5584 /* Note that rtype could also be NULL_TREE. This happens if we are | |
5585 messaging a class by name, but the class was only | |
5586 forward-declared using @class. */ | |
5587 | |
5588 /* For 'id' or 'Class' receivers, search in the global hash table as | |
5589 a last resort. For all receivers, warn if protocol searches have | |
5590 failed. */ | |
5591 if (!method_prototype) | |
5592 { | |
5593 if (rprotos) | |
5594 warning (0, "%<%c%E%> not found in protocol(s)", | |
5595 (class_tree ? '+' : '-'), | |
5596 sel_name); | |
5597 | |
5598 if (!rtype) | |
5599 method_prototype | |
5600 = lookup_method_in_hash_lists (sel_name, class_tree != NULL_TREE); | |
5601 } | |
5602 | |
5603 if (!method_prototype) | |
5604 { | |
5605 static bool warn_missing_methods = false; | |
5606 | |
5607 if (rtype) | |
5608 warning (0, "%qE may not respond to %<%c%E%>", | |
5609 OBJC_TYPE_NAME (rtype), | |
5610 (class_tree ? '+' : '-'), | |
5611 sel_name); | |
5612 /* If we are messaging an 'id' or 'Class' object and made it here, | |
5613 then we have failed to find _any_ instance or class method, | |
5614 respectively. */ | |
5615 else | |
5616 warning (0, "no %<%c%E%> method found", | |
5617 (class_tree ? '+' : '-'), | |
5618 sel_name); | |
5619 | |
5620 if (!warn_missing_methods) | |
5621 { | |
5622 warning_at (input_location, | |
5623 0, "(Messages without a matching method signature"); | |
5624 warning_at (input_location, | |
5625 0, "will be assumed to return %<id%> and accept"); | |
5626 warning_at (input_location, | |
5627 0, "%<...%> as arguments.)"); | |
5628 warn_missing_methods = true; | |
5629 } | |
5630 } | |
5631 else | |
5632 { | |
5633 /* Warn if the method is deprecated, but not if the receiver is | |
5634 a generic 'id'. 'id' is used to cast an object to a generic | |
5635 object of an unspecified class; in that case, we'll use | |
5636 whatever method prototype we can find to get the method | |
5637 argument and return types, but it is not appropriate to | |
5638 produce deprecation warnings since we don't know the class | |
5639 that the object will be of at runtime. The @interface(s) for | |
5640 that class may not even be available to the compiler right | |
5641 now, and it is perfectly possible that the method is marked | |
5642 as non-deprecated in such @interface(s). | |
5643 | |
5644 In practice this makes sense since casting an object to 'id' | |
5645 is often used precisely to turn off warnings associated with | |
5646 the object being of a particular class. */ | |
5647 if (TREE_DEPRECATED (method_prototype) && rtype != NULL_TREE) | |
5648 { | |
5649 if (deprecated_method_prototype) | |
5650 *deprecated_method_prototype = method_prototype; | |
5651 else | |
5652 warn_deprecated_use (method_prototype, NULL_TREE); | |
5653 } | |
5654 } | |
5655 | |
5656 /* Save the selector name for printing error messages. */ | |
5657 current_objc_message_selector = sel_name; | |
5658 | |
5659 /* Build the method call. | |
5660 TODO: Get the location from somewhere that will work for delayed | |
5661 expansion. */ | |
5662 | |
5663 retval = (*runtime.build_objc_method_call) (input_location, method_prototype, | |
5664 receiver, rtype, sel_name, | |
5665 method_params, super); | |
5666 | |
5667 current_objc_message_selector = 0; | |
5668 | |
5669 return retval; | |
5670 } | |
5671 | |
5672 | |
5673 /* This routine creates a static variable used to implement @protocol(MyProtocol) | |
5674 expression. This variable will be initialized to global protocol_t meta-data | |
5675 pointer. */ | |
5676 | |
5677 /* This function is called by the parser when (and only when) a | |
5678 @protocol() expression is found, in order to compile it. */ | |
5679 tree | |
5680 objc_build_protocol_expr (tree protoname) | |
5681 { | |
5682 tree p = lookup_protocol (protoname, /* warn if deprecated */ true, | |
5683 /* definition_required */ false); | |
5684 | |
5685 if (!p) | |
5686 { | |
5687 error ("cannot find protocol declaration for %qE", protoname); | |
5688 return error_mark_node; | |
5689 } | |
5690 | |
5691 return (*runtime.get_protocol_reference) (input_location, p); | |
5692 } | |
5693 | |
5694 /* This function is called by the parser when a @selector() expression | |
5695 is found, in order to compile it. It is only called by the parser | |
5696 and only to compile a @selector(). LOC is the location of the | |
5697 @selector. */ | |
5698 tree | |
5699 objc_build_selector_expr (location_t loc, tree selnamelist) | |
5700 { | |
5701 tree selname; | |
5702 | |
5703 /* Obtain the full selector name. */ | |
5704 switch (TREE_CODE (selnamelist)) | |
5705 { | |
5706 case IDENTIFIER_NODE: | |
5707 /* A unary selector. */ | |
5708 selname = selnamelist; | |
5709 break; | |
5710 case TREE_LIST: | |
5711 selname = build_keyword_selector (selnamelist); | |
5712 break; | |
5713 default: | |
5714 gcc_unreachable (); | |
5715 } | |
5716 | |
5717 /* If we are required to check @selector() expressions as they | |
5718 are found, check that the selector has been declared. */ | |
5719 if (warn_undeclared_selector) | |
5720 { | |
5721 /* Look the selector up in the list of all known class and | |
5722 instance methods (up to this line) to check that the selector | |
5723 exists. */ | |
5724 tree method; | |
5725 | |
5726 /* First try with instance methods. */ | |
5727 method = objc_map_get (instance_method_map, selname); | |
5728 | |
5729 /* If not found, try with class methods. */ | |
5730 if (method == OBJC_MAP_NOT_FOUND) | |
5731 { | |
5732 method = objc_map_get (class_method_map, selname); | |
5733 | |
5734 /* If still not found, print out a warning. */ | |
5735 if (method == OBJC_MAP_NOT_FOUND) | |
5736 warning (0, "undeclared selector %qE", selname); | |
5737 } | |
5738 } | |
5739 | |
5740 /* The runtimes do this differently, most particularly, GNU has typed | |
5741 selectors, whilst NeXT does not. */ | |
5742 return (*runtime.build_selector_reference) (loc, selname, NULL_TREE); | |
5743 } | |
5744 | |
5745 static tree | |
5746 build_ivar_reference (tree id) | |
5747 { | |
5748 tree base; | |
5749 if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL) | |
5750 { | |
5751 /* Historically, a class method that produced objects (factory | |
5752 method) would assign `self' to the instance that it | |
5753 allocated. This would effectively turn the class method into | |
5754 an instance method. Following this assignment, the instance | |
5755 variables could be accessed. That practice, while safe, | |
5756 violates the simple rule that a class method should not refer | |
5757 to an instance variable. It's better to catch the cases | |
5758 where this is done unknowingly than to support the above | |
5759 paradigm. */ | |
5760 warning (0, "instance variable %qE accessed in class method", | |
5761 id); | |
5762 self_decl = convert (objc_instance_type, self_decl); /* cast */ | |
5763 } | |
5764 | |
5765 base = build_indirect_ref (input_location, self_decl, RO_ARROW); | |
5766 return (*runtime.build_ivar_reference) (input_location, base, id); | |
5767 } | |
5768 | |
5769 static void | |
5770 hash_init (void) | |
5771 { | |
5772 instance_method_map = objc_map_alloc_ggc (1000); | |
5773 class_method_map = objc_map_alloc_ggc (1000); | |
5774 | |
5775 class_name_map = objc_map_alloc_ggc (200); | |
5776 alias_name_map = objc_map_alloc_ggc (200); | |
5777 | |
5778 /* Initialize the hash table used to hold the constant string objects. */ | |
5779 string_htab = hash_table<objc_string_hasher>::create_ggc (31); | |
5780 } | |
5781 | |
5782 /* Use the following to add a method to class_method_map or | |
5783 instance_method_map. It will add the method, keyed by the | |
5784 METHOD_SEL_NAME. If the method already exists, but with one or | |
5785 more different prototypes, it will store a TREE_VEC in the map, | |
5786 with the method prototypes in the vector. */ | |
5787 static void | |
5788 insert_method_into_method_map (bool class_method, tree method) | |
5789 { | |
5790 tree method_name = METHOD_SEL_NAME (method); | |
5791 tree existing_entry; | |
5792 objc_map_t map; | |
5793 | |
5794 if (class_method) | |
5795 map = class_method_map; | |
5796 else | |
5797 map = instance_method_map; | |
5798 | |
5799 /* Check if the method already exists in the map. */ | |
5800 existing_entry = objc_map_get (map, method_name); | |
5801 | |
5802 /* If not, we simply add it to the map. */ | |
5803 if (existing_entry == OBJC_MAP_NOT_FOUND) | |
5804 objc_map_put (map, method_name, method); | |
5805 else | |
5806 { | |
5807 tree new_entry; | |
5808 | |
5809 /* If an entry already exists, it's more complicated. We'll | |
5810 have to check whether the method prototype is the same or | |
5811 not. */ | |
5812 if (TREE_CODE (existing_entry) != TREE_VEC) | |
5813 { | |
5814 /* If the method prototypes are the same, there is nothing | |
5815 to do. */ | |
5816 if (comp_proto_with_proto (method, existing_entry, 1)) | |
5817 return; | |
5818 | |
5819 /* If not, create a vector to store both the method already | |
5820 in the map, and the new one that we are adding. */ | |
5821 new_entry = make_tree_vec (2); | |
5822 | |
5823 TREE_VEC_ELT (new_entry, 0) = existing_entry; | |
5824 TREE_VEC_ELT (new_entry, 1) = method; | |
5825 } | |
5826 else | |
5827 { | |
5828 /* An entry already exists, and it's already a vector. This | |
5829 means that at least 2 different method prototypes were | |
5830 already found, and we're considering registering yet | |
5831 another one. */ | |
5832 size_t i; | |
5833 | |
5834 /* Check all the existing prototypes. If any matches the | |
5835 one we need to add, there is nothing to do because it's | |
5836 already there. */ | |
5837 for (i = 0; i < (size_t) TREE_VEC_LENGTH (existing_entry); i++) | |
5838 if (comp_proto_with_proto (method, TREE_VEC_ELT (existing_entry, i), 1)) | |
5839 return; | |
5840 | |
5841 /* Else, create a new, bigger vector and add the new method | |
5842 at the end of it. This is inefficient but extremely | |
5843 rare; in any sane program most methods have a single | |
5844 prototype, and very few, if any, will have more than | |
5845 2! */ | |
5846 new_entry = make_tree_vec (TREE_VEC_LENGTH (existing_entry) + 1); | |
5847 | |
5848 /* Copy the methods from the existing vector. */ | |
5849 for (i = 0; i < (size_t) TREE_VEC_LENGTH (existing_entry); i++) | |
5850 TREE_VEC_ELT (new_entry, i) = TREE_VEC_ELT (existing_entry, i); | |
5851 | |
5852 /* Add the new method at the end. */ | |
5853 TREE_VEC_ELT (new_entry, i) = method; | |
5854 } | |
5855 | |
5856 /* Store the new vector in the map. */ | |
5857 objc_map_put (map, method_name, new_entry); | |
5858 } | |
5859 } | |
5860 | |
5861 | |
5862 static tree | |
5863 lookup_method (tree mchain, tree method) | |
5864 { | |
5865 tree key; | |
5866 | |
5867 if (TREE_CODE (method) == IDENTIFIER_NODE) | |
5868 key = method; | |
5869 else | |
5870 key = METHOD_SEL_NAME (method); | |
5871 | |
5872 while (mchain) | |
5873 { | |
5874 if (METHOD_SEL_NAME (mchain) == key) | |
5875 return mchain; | |
5876 | |
5877 mchain = DECL_CHAIN (mchain); | |
5878 } | |
5879 return NULL_TREE; | |
5880 } | |
5881 | |
5882 /* Look up a class (if OBJC_LOOKUP_CLASS is set in FLAGS) or instance | |
5883 method in INTERFACE, along with any categories and protocols | |
5884 attached thereto. If method is not found, and the | |
5885 OBJC_LOOKUP_NO_SUPER is _not_ set in FLAGS, recursively examine the | |
5886 INTERFACE's superclass. If OBJC_LOOKUP_CLASS is set, | |
5887 OBJC_LOOKUP_NO_SUPER is clear, and no suitable class method could | |
5888 be found in INTERFACE or any of its superclasses, look for an | |
5889 _instance_ method of the same name in the root class as a last | |
5890 resort. This behavior can be turned off by using | |
5891 OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS. | |
5892 | |
5893 If a suitable method cannot be found, return NULL_TREE. */ | |
5894 | |
5895 static tree | |
5896 lookup_method_static (tree interface, tree ident, int flags) | |
5897 { | |
5898 tree meth = NULL_TREE, root_inter = NULL_TREE; | |
5899 tree inter = interface; | |
5900 int is_class = (flags & OBJC_LOOKUP_CLASS); | |
5901 int no_superclasses = (flags & OBJC_LOOKUP_NO_SUPER); | |
5902 int no_instance_methods_of_root_class = (flags & OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS); | |
5903 | |
5904 while (inter) | |
5905 { | |
5906 tree chain = is_class ? CLASS_CLS_METHODS (inter) : CLASS_NST_METHODS (inter); | |
5907 tree category = inter; | |
5908 | |
5909 /* First, look up the method in the class itself. */ | |
5910 if ((meth = lookup_method (chain, ident))) | |
5911 return meth; | |
5912 | |
5913 /* Failing that, look for the method in each category of the class. */ | |
5914 while ((category = CLASS_CATEGORY_LIST (category))) | |
5915 { | |
5916 chain = is_class ? CLASS_CLS_METHODS (category) : CLASS_NST_METHODS (category); | |
5917 | |
5918 /* Check directly in each category. */ | |
5919 if ((meth = lookup_method (chain, ident))) | |
5920 return meth; | |
5921 | |
5922 /* Failing that, check in each category's protocols. */ | |
5923 if (CLASS_PROTOCOL_LIST (category)) | |
5924 { | |
5925 if ((meth = (lookup_method_in_protocol_list | |
5926 (CLASS_PROTOCOL_LIST (category), ident, is_class)))) | |
5927 return meth; | |
5928 } | |
5929 } | |
5930 | |
5931 /* If not found in categories, check in protocols of the main class. */ | |
5932 if (CLASS_PROTOCOL_LIST (inter)) | |
5933 { | |
5934 if ((meth = (lookup_method_in_protocol_list | |
5935 (CLASS_PROTOCOL_LIST (inter), ident, is_class)))) | |
5936 return meth; | |
5937 } | |
5938 | |
5939 /* If we were instructed not to look in superclasses, don't. */ | |
5940 if (no_superclasses) | |
5941 return NULL_TREE; | |
5942 | |
5943 /* Failing that, climb up the inheritance hierarchy. */ | |
5944 root_inter = inter; | |
5945 inter = lookup_interface (CLASS_SUPER_NAME (inter)); | |
5946 } | |
5947 while (inter); | |
5948 | |
5949 if (is_class && !no_instance_methods_of_root_class) | |
5950 { | |
5951 /* If no class (factory) method was found, check if an _instance_ | |
5952 method of the same name exists in the root class. This is what | |
5953 the Objective-C runtime will do. */ | |
5954 return lookup_method_static (root_inter, ident, 0); | |
5955 } | |
5956 else | |
5957 { | |
5958 /* If an instance method was not found, return 0. */ | |
5959 return NULL_TREE; | |
5960 } | |
5961 } | |
5962 | |
5963 static tree | |
5964 objc_add_method (tree klass, tree method, int is_class, bool is_optional) | |
5965 { | |
5966 tree existing_method = NULL_TREE; | |
5967 | |
5968 /* The first thing we do is look up the method in the list of | |
5969 methods already defined in the interface (or implementation). */ | |
5970 if (is_class) | |
5971 existing_method = lookup_method (CLASS_CLS_METHODS (klass), method); | |
5972 else | |
5973 existing_method = lookup_method (CLASS_NST_METHODS (klass), method); | |
5974 | |
5975 /* In the case of protocols, we have a second list of methods to | |
5976 consider, the list of optional ones. */ | |
5977 if (TREE_CODE (klass) == PROTOCOL_INTERFACE_TYPE) | |
5978 { | |
5979 /* @required methods are added to the protocol's normal list. | |
5980 @optional methods are added to the protocol's OPTIONAL lists. | |
5981 Note that adding the methods to the optional lists disables | |
5982 checking that the methods are implemented by classes | |
5983 implementing the protocol, since these checks only use the | |
5984 CLASS_CLS_METHODS and CLASS_NST_METHODS. */ | |
5985 | |
5986 /* First of all, if the method to add is @optional, and we found | |
5987 it already existing as @required, emit an error. */ | |
5988 if (is_optional && existing_method) | |
5989 { | |
5990 error ("method %<%c%E%> declared %<@optional%> and %<@required%> at the same time", | |
5991 (is_class ? '+' : '-'), | |
5992 METHOD_SEL_NAME (existing_method)); | |
5993 inform (DECL_SOURCE_LOCATION (existing_method), | |
5994 "previous declaration of %<%c%E%> as %<@required%>", | |
5995 (is_class ? '+' : '-'), | |
5996 METHOD_SEL_NAME (existing_method)); | |
5997 } | |
5998 | |
5999 /* Now check the list of @optional methods if we didn't find the | |
6000 method in the @required list. */ | |
6001 if (!existing_method) | |
6002 { | |
6003 if (is_class) | |
6004 existing_method = lookup_method (PROTOCOL_OPTIONAL_CLS_METHODS (klass), method); | |
6005 else | |
6006 existing_method = lookup_method (PROTOCOL_OPTIONAL_NST_METHODS (klass), method); | |
6007 | |
6008 if (!is_optional && existing_method) | |
6009 { | |
6010 error ("method %<%c%E%> declared %<@optional%> and %<@required%> at the same time", | |
6011 (is_class ? '+' : '-'), | |
6012 METHOD_SEL_NAME (existing_method)); | |
6013 inform (DECL_SOURCE_LOCATION (existing_method), | |
6014 "previous declaration of %<%c%E%> as %<@optional%>", | |
6015 (is_class ? '+' : '-'), | |
6016 METHOD_SEL_NAME (existing_method)); | |
6017 } | |
6018 } | |
6019 } | |
6020 | |
6021 /* If the method didn't exist already, add it. */ | |
6022 if (!existing_method) | |
6023 { | |
6024 if (is_optional) | |
6025 { | |
6026 if (is_class) | |
6027 { | |
6028 /* Put the method on the list in reverse order. */ | |
6029 TREE_CHAIN (method) = PROTOCOL_OPTIONAL_CLS_METHODS (klass); | |
6030 PROTOCOL_OPTIONAL_CLS_METHODS (klass) = method; | |
6031 } | |
6032 else | |
6033 { | |
6034 TREE_CHAIN (method) = PROTOCOL_OPTIONAL_NST_METHODS (klass); | |
6035 PROTOCOL_OPTIONAL_NST_METHODS (klass) = method; | |
6036 } | |
6037 } | |
6038 else | |
6039 { | |
6040 if (is_class) | |
6041 { | |
6042 DECL_CHAIN (method) = CLASS_CLS_METHODS (klass); | |
6043 CLASS_CLS_METHODS (klass) = method; | |
6044 } | |
6045 else | |
6046 { | |
6047 DECL_CHAIN (method) = CLASS_NST_METHODS (klass); | |
6048 CLASS_NST_METHODS (klass) = method; | |
6049 } | |
6050 } | |
6051 } | |
6052 else | |
6053 { | |
6054 /* The method was already defined. Check that the types match | |
6055 for an @interface for a class or category, or for a | |
6056 @protocol. Give hard errors on methods with identical | |
6057 selectors but differing argument and/or return types. We do | |
6058 not do this for @implementations, because C/C++ will do it | |
6059 for us (i.e., there will be duplicate function definition | |
6060 errors). */ | |
6061 if ((TREE_CODE (klass) == CLASS_INTERFACE_TYPE | |
6062 || TREE_CODE (klass) == CATEGORY_INTERFACE_TYPE | |
6063 /* Starting with GCC 4.6, we emit the same error for | |
6064 protocols too. The situation is identical to | |
6065 @interfaces as there is no possible meaningful reason | |
6066 for defining the same method with different signatures | |
6067 in the very same @protocol. If that was allowed, | |
6068 whenever the protocol is used (both at compile and run | |
6069 time) there wouldn't be any meaningful way to decide | |
6070 which of the two method signatures should be used. */ | |
6071 || TREE_CODE (klass) == PROTOCOL_INTERFACE_TYPE) | |
6072 && !comp_proto_with_proto (method, existing_method, 1)) | |
6073 { | |
6074 error ("duplicate declaration of method %<%c%E%> with conflicting types", | |
6075 (is_class ? '+' : '-'), | |
6076 METHOD_SEL_NAME (existing_method)); | |
6077 inform (DECL_SOURCE_LOCATION (existing_method), | |
6078 "previous declaration of %<%c%E%>", | |
6079 (is_class ? '+' : '-'), | |
6080 METHOD_SEL_NAME (existing_method)); | |
6081 } | |
6082 } | |
6083 | |
6084 if (is_class) | |
6085 insert_method_into_method_map (true, method); | |
6086 else | |
6087 { | |
6088 insert_method_into_method_map (false, method); | |
6089 | |
6090 /* Instance methods in root classes (and categories thereof) | |
6091 may act as class methods as a last resort. We also add | |
6092 instance methods listed in @protocol declarations to | |
6093 the class hash table, on the assumption that @protocols | |
6094 may be adopted by root classes or categories. */ | |
6095 if (TREE_CODE (klass) == CATEGORY_INTERFACE_TYPE | |
6096 || TREE_CODE (klass) == CATEGORY_IMPLEMENTATION_TYPE) | |
6097 klass = lookup_interface (CLASS_NAME (klass)); | |
6098 | |
6099 if (TREE_CODE (klass) == PROTOCOL_INTERFACE_TYPE | |
6100 || !CLASS_SUPER_NAME (klass)) | |
6101 insert_method_into_method_map (true, method); | |
6102 } | |
6103 | |
6104 return method; | |
6105 } | |
6106 | |
6107 static void | |
6108 add_category (tree klass, tree category) | |
6109 { | |
6110 /* Put categories on list in reverse order. */ | |
6111 tree cat = lookup_category (klass, CLASS_SUPER_NAME (category)); | |
6112 | |
6113 if (cat) | |
6114 { | |
6115 warning (0, "duplicate interface declaration for category %<%E(%E)%>", | |
6116 CLASS_NAME (klass), | |
6117 CLASS_SUPER_NAME (category)); | |
6118 } | |
6119 else | |
6120 { | |
6121 CLASS_CATEGORY_LIST (category) = CLASS_CATEGORY_LIST (klass); | |
6122 CLASS_CATEGORY_LIST (klass) = category; | |
6123 } | |
6124 } | |
6125 | |
6126 #ifndef OBJCPLUS | |
6127 /* A flexible array member is a C99 extension where you can use | |
6128 "type[]" at the end of a struct to mean a variable-length array. | |
6129 | |
6130 In Objective-C, instance variables are fundamentally members of a | |
6131 struct, but the struct can always be extended by subclassing; hence | |
6132 we need to detect and forbid all instance variables declared using | |
6133 flexible array members. | |
6134 | |
6135 No check for this is needed in Objective-C++, since C++ does not | |
6136 have flexible array members. */ | |
6137 | |
6138 /* Determine whether TYPE is a structure with a flexible array member, | |
6139 a union containing such a structure (possibly recursively) or an | |
6140 array of such structures or unions. These are all invalid as | |
6141 instance variable. */ | |
6142 static bool | |
6143 flexible_array_type_p (tree type) | |
6144 { | |
6145 tree x; | |
6146 switch (TREE_CODE (type)) | |
6147 { | |
6148 case RECORD_TYPE: | |
6149 x = TYPE_FIELDS (type); | |
6150 if (x == NULL_TREE) | |
6151 return false; | |
6152 while (DECL_CHAIN (x) != NULL_TREE) | |
6153 x = DECL_CHAIN (x); | |
6154 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
6155 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
6156 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
6157 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
6158 return true; | |
6159 return false; | |
6160 case UNION_TYPE: | |
6161 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x)) | |
6162 { | |
6163 if (flexible_array_type_p (TREE_TYPE (x))) | |
6164 return true; | |
6165 } | |
6166 return false; | |
6167 /* Note that we also check for arrays of something that uses a flexible array member. */ | |
6168 case ARRAY_TYPE: | |
6169 if (flexible_array_type_p (TREE_TYPE (type))) | |
6170 return true; | |
6171 return false; | |
6172 default: | |
6173 return false; | |
6174 } | |
6175 } | |
6176 #endif | |
6177 | |
6178 /* Produce a printable version of an ivar name. This is only used | |
6179 inside add_instance_variable. */ | |
6180 static const char * | |
6181 printable_ivar_name (tree field_decl) | |
6182 { | |
6183 if (DECL_NAME (field_decl)) | |
6184 return identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (field_decl))); | |
6185 else | |
6186 return _("<unnamed>"); | |
6187 } | |
6188 | |
6189 /* Called after parsing each instance variable declaration. Necessary to | |
6190 preserve typedefs and implement public/private... | |
6191 | |
6192 VISIBILITY is 1 for public, 0 for protected, and 2 for private. */ | |
6193 | |
6194 static tree | |
6195 add_instance_variable (tree klass, objc_ivar_visibility_kind visibility, | |
6196 tree field_decl) | |
6197 { | |
6198 tree field_type = TREE_TYPE (field_decl); | |
6199 | |
6200 #ifdef OBJCPLUS | |
6201 if (TREE_CODE (field_type) == REFERENCE_TYPE) | |
6202 { | |
6203 error ("illegal reference type specified for instance variable %qs", | |
6204 printable_ivar_name (field_decl)); | |
6205 /* Return class as is without adding this ivar. */ | |
6206 return klass; | |
6207 } | |
6208 #endif | |
6209 | |
6210 if (field_type == error_mark_node || !TYPE_SIZE (field_type) | |
6211 || TYPE_SIZE (field_type) == error_mark_node) | |
6212 /* 'type[0]' is allowed, but 'type[]' is not! */ | |
6213 { | |
6214 error ("instance variable %qs has unknown size", | |
6215 printable_ivar_name (field_decl)); | |
6216 /* Return class as is without adding this ivar. */ | |
6217 return klass; | |
6218 } | |
6219 | |
6220 #ifndef OBJCPLUS | |
6221 /* Also, in C reject a struct with a flexible array member. Ie, | |
6222 | |
6223 struct A { int x; int[] y; }; | |
6224 | |
6225 @interface X | |
6226 { | |
6227 struct A instance_variable; | |
6228 } | |
6229 @end | |
6230 | |
6231 is not valid because if the class is subclassed, we wouldn't be able | |
6232 to calculate the offset of the next instance variable. */ | |
6233 if (flexible_array_type_p (field_type)) | |
6234 { | |
6235 error ("instance variable %qs uses flexible array member", | |
6236 printable_ivar_name (field_decl)); | |
6237 /* Return class as is without adding this ivar. */ | |
6238 return klass; | |
6239 } | |
6240 #endif | |
6241 | |
6242 #ifdef OBJCPLUS | |
6243 /* Check if the ivar being added has a non-POD C++ type. If so, we will | |
6244 need to either (1) warn the user about it or (2) generate suitable | |
6245 constructor/destructor call from '- .cxx_construct' or '- .cxx_destruct' | |
6246 methods (if '-fobjc-call-cxx-cdtors' was specified). */ | |
6247 if (MAYBE_CLASS_TYPE_P (field_type) | |
6248 && (TYPE_NEEDS_CONSTRUCTING (field_type) | |
6249 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type) | |
6250 || TYPE_POLYMORPHIC_P (field_type))) | |
6251 { | |
6252 tree type_name = OBJC_TYPE_NAME (field_type); | |
6253 | |
6254 if (flag_objc_call_cxx_cdtors) | |
6255 { | |
6256 /* Since the ObjC runtime will be calling the constructors and | |
6257 destructors for us, the only thing we can't handle is the lack | |
6258 of a default constructor. */ | |
6259 if (TYPE_NEEDS_CONSTRUCTING (field_type) | |
6260 && !TYPE_HAS_DEFAULT_CONSTRUCTOR (field_type)) | |
6261 { | |
6262 warning (0, "type %qE has no default constructor to call", | |
6263 type_name); | |
6264 | |
6265 /* If we cannot call a constructor, we should also avoid | |
6266 calling the destructor, for symmetry. */ | |
6267 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type)) | |
6268 warning (0, "destructor for %qE shall not be run either", | |
6269 type_name); | |
6270 } | |
6271 } | |
6272 else | |
6273 { | |
6274 static bool warn_cxx_ivars = false; | |
6275 | |
6276 if (TYPE_POLYMORPHIC_P (field_type)) | |
6277 { | |
6278 /* Vtable pointers are Real Bad(tm), since Obj-C cannot | |
6279 initialize them. */ | |
6280 error ("type %qE has virtual member functions", type_name); | |
6281 error ("illegal aggregate type %qE specified " | |
6282 "for instance variable %qs", | |
6283 type_name, printable_ivar_name (field_decl)); | |
6284 /* Return class as is without adding this ivar. */ | |
6285 return klass; | |
6286 } | |
6287 | |
6288 /* User-defined constructors and destructors are not known to Obj-C | |
6289 and hence will not be called. This may or may not be a problem. */ | |
6290 if (TYPE_NEEDS_CONSTRUCTING (field_type)) | |
6291 warning (0, "type %qE has a user-defined constructor", type_name); | |
6292 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type)) | |
6293 warning (0, "type %qE has a user-defined destructor", type_name); | |
6294 | |
6295 if (!warn_cxx_ivars) | |
6296 { | |
6297 warning (0, "C++ constructors and destructors will not " | |
6298 "be invoked for Objective-C fields"); | |
6299 warn_cxx_ivars = true; | |
6300 } | |
6301 } | |
6302 } | |
6303 #endif | |
6304 | |
6305 /* Overload the public attribute, it is not used for FIELD_DECLs. */ | |
6306 switch (visibility) | |
6307 { | |
6308 case OBJC_IVAR_VIS_PROTECTED: | |
6309 TREE_PUBLIC (field_decl) = 0; | |
6310 TREE_PRIVATE (field_decl) = 0; | |
6311 TREE_PROTECTED (field_decl) = 1; | |
6312 break; | |
6313 | |
6314 case OBJC_IVAR_VIS_PACKAGE: | |
6315 /* TODO: Implement the package variant. */ | |
6316 case OBJC_IVAR_VIS_PUBLIC: | |
6317 TREE_PUBLIC (field_decl) = 1; | |
6318 TREE_PRIVATE (field_decl) = 0; | |
6319 TREE_PROTECTED (field_decl) = 0; | |
6320 break; | |
6321 | |
6322 case OBJC_IVAR_VIS_PRIVATE: | |
6323 TREE_PUBLIC (field_decl) = 0; | |
6324 TREE_PRIVATE (field_decl) = 1; | |
6325 TREE_PROTECTED (field_decl) = 0; | |
6326 break; | |
6327 | |
6328 } | |
6329 | |
6330 CLASS_RAW_IVARS (klass) = chainon (CLASS_RAW_IVARS (klass), field_decl); | |
6331 | |
6332 return klass; | |
6333 } | |
6334 | |
6335 /* True if the ivar is private and we are not in its implementation. */ | |
6336 | |
6337 static int | |
6338 is_private (tree decl) | |
6339 { | |
6340 return (TREE_PRIVATE (decl) | |
6341 && ! is_ivar (CLASS_IVARS (implementation_template), | |
6342 DECL_NAME (decl))); | |
6343 } | |
6344 | |
6345 /* Searches all the instance variables of 'klass' and of its | |
6346 superclasses for an instance variable whose name (identifier) is | |
6347 'ivar_name_ident'. Return the declaration (DECL) of the instance | |
6348 variable, if found, or NULL_TREE, if not found. */ | |
6349 static inline tree | |
6350 ivar_of_class (tree klass, tree ivar_name_ident) | |
6351 { | |
6352 /* First, look up the ivar in CLASS_RAW_IVARS. */ | |
6353 tree decl_chain = CLASS_RAW_IVARS (klass); | |
6354 | |
6355 for ( ; decl_chain; decl_chain = DECL_CHAIN (decl_chain)) | |
6356 if (DECL_NAME (decl_chain) == ivar_name_ident) | |
6357 return decl_chain; | |
6358 | |
6359 /* If not found, search up the class hierarchy. */ | |
6360 while (CLASS_SUPER_NAME (klass)) | |
6361 { | |
6362 klass = lookup_interface (CLASS_SUPER_NAME (klass)); | |
6363 | |
6364 decl_chain = CLASS_RAW_IVARS (klass); | |
6365 | |
6366 for ( ; decl_chain; decl_chain = DECL_CHAIN (decl_chain)) | |
6367 if (DECL_NAME (decl_chain) == ivar_name_ident) | |
6368 return decl_chain; | |
6369 } | |
6370 | |
6371 return NULL_TREE; | |
6372 } | |
6373 | |
6374 /* We have an instance variable reference;, check to see if it is public. */ | |
6375 | |
6376 int | |
6377 objc_is_public (tree expr, tree identifier) | |
6378 { | |
6379 tree basetype, decl; | |
6380 | |
6381 #ifdef OBJCPLUS | |
6382 if (processing_template_decl) | |
6383 return 1; | |
6384 #endif | |
6385 | |
6386 if (TREE_TYPE (expr) == error_mark_node) | |
6387 return 1; | |
6388 | |
6389 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); | |
6390 | |
6391 if (basetype && TREE_CODE (basetype) == RECORD_TYPE) | |
6392 { | |
6393 if (TYPE_HAS_OBJC_INFO (basetype) && TYPE_OBJC_INTERFACE (basetype)) | |
6394 { | |
6395 tree klass = lookup_interface (OBJC_TYPE_NAME (basetype)); | |
6396 | |
6397 if (!klass) | |
6398 { | |
6399 error ("cannot find interface declaration for %qE", | |
6400 OBJC_TYPE_NAME (basetype)); | |
6401 return 0; | |
6402 } | |
6403 | |
6404 if ((decl = ivar_of_class (klass, identifier))) | |
6405 { | |
6406 if (TREE_PUBLIC (decl)) | |
6407 return 1; | |
6408 | |
6409 /* Important difference between the Stepstone translator: | |
6410 all instance variables should be public within the context | |
6411 of the implementation. */ | |
6412 if (objc_implementation_context | |
6413 && ((TREE_CODE (objc_implementation_context) | |
6414 == CLASS_IMPLEMENTATION_TYPE) | |
6415 || (TREE_CODE (objc_implementation_context) | |
6416 == CATEGORY_IMPLEMENTATION_TYPE))) | |
6417 { | |
6418 tree curtype = TYPE_MAIN_VARIANT | |
6419 (CLASS_STATIC_TEMPLATE | |
6420 (implementation_template)); | |
6421 | |
6422 if (basetype == curtype | |
6423 || DERIVED_FROM_P (basetype, curtype)) | |
6424 { | |
6425 int priv = is_private (decl); | |
6426 | |
6427 if (priv) | |
6428 error ("instance variable %qE is declared private", | |
6429 DECL_NAME (decl)); | |
6430 | |
6431 return !priv; | |
6432 } | |
6433 } | |
6434 | |
6435 /* The 2.95.2 compiler sometimes allowed C functions to access | |
6436 non-@public ivars. We will let this slide for now... */ | |
6437 if (!objc_method_context) | |
6438 { | |
6439 warning (0, "instance variable %qE is %s; " | |
6440 "this will be a hard error in the future", | |
6441 identifier, | |
6442 TREE_PRIVATE (decl) ? "@private" : "@protected"); | |
6443 return 1; | |
6444 } | |
6445 | |
6446 error ("instance variable %qE is declared %s", | |
6447 identifier, | |
6448 TREE_PRIVATE (decl) ? "private" : "protected"); | |
6449 return 0; | |
6450 } | |
6451 } | |
6452 } | |
6453 | |
6454 return 1; | |
6455 } | |
6456 | |
6457 /* Make sure all methods in CHAIN (a list of method declarations from | |
6458 an @interface or a @protocol) are in IMPLEMENTATION (the | |
6459 implementation context). This is used to check for example that | |
6460 all methods declared in an @interface were implemented in an | |
6461 @implementation. | |
6462 | |
6463 Some special methods (property setters/getters) are special and if | |
6464 they are not found in IMPLEMENTATION, we look them up in its | |
6465 superclasses. */ | |
6466 | |
6467 static int | |
6468 check_methods (tree chain, tree implementation, int mtype) | |
6469 { | |
6470 int first = 1; | |
6471 tree list; | |
6472 | |
6473 if (mtype == (int)'+') | |
6474 list = CLASS_CLS_METHODS (implementation); | |
6475 else | |
6476 list = CLASS_NST_METHODS (implementation); | |
6477 | |
6478 while (chain) | |
6479 { | |
6480 /* If the method is associated with a dynamic property, then it | |
6481 is Ok not to have the method implementation, as it will be | |
6482 generated dynamically at runtime. To decide if the method is | |
6483 associated with a @dynamic property, we search the list of | |
6484 @synthesize and @dynamic for this implementation, and look | |
6485 for any @dynamic property with the same setter or getter name | |
6486 as this method. */ | |
6487 tree x; | |
6488 for (x = IMPL_PROPERTY_DECL (implementation); x; x = TREE_CHAIN (x)) | |
6489 if (PROPERTY_DYNAMIC (x) | |
6490 && (PROPERTY_GETTER_NAME (x) == METHOD_SEL_NAME (chain) | |
6491 || PROPERTY_SETTER_NAME (x) == METHOD_SEL_NAME (chain))) | |
6492 break; | |
6493 | |
6494 if (x != NULL_TREE) | |
6495 { | |
6496 chain = TREE_CHAIN (chain); /* next method... */ | |
6497 continue; | |
6498 } | |
6499 | |
6500 if (!lookup_method (list, chain)) | |
6501 { | |
6502 /* If the method is a property setter/getter, we'll still | |
6503 allow it to be missing if it is implemented by | |
6504 'interface' or any of its superclasses. */ | |
6505 tree property = METHOD_PROPERTY_CONTEXT (chain); | |
6506 if (property) | |
6507 { | |
6508 /* Note that since this is a property getter/setter, it | |
6509 is obviously an instance method. */ | |
6510 tree interface = NULL_TREE; | |
6511 | |
6512 /* For a category, first check the main class | |
6513 @interface. */ | |
6514 if (TREE_CODE (implementation) == CATEGORY_IMPLEMENTATION_TYPE) | |
6515 { | |
6516 interface = lookup_interface (CLASS_NAME (implementation)); | |
6517 | |
6518 /* If the method is found in the main class, it's Ok. */ | |
6519 if (lookup_method (CLASS_NST_METHODS (interface), chain)) | |
6520 { | |
6521 chain = DECL_CHAIN (chain); | |
6522 continue; | |
6523 } | |
6524 | |
6525 /* Else, get the superclass. */ | |
6526 if (CLASS_SUPER_NAME (interface)) | |
6527 interface = lookup_interface (CLASS_SUPER_NAME (interface)); | |
6528 else | |
6529 interface = NULL_TREE; | |
6530 } | |
6531 | |
6532 /* Get the superclass for classes. */ | |
6533 if (TREE_CODE (implementation) == CLASS_IMPLEMENTATION_TYPE) | |
6534 { | |
6535 if (CLASS_SUPER_NAME (implementation)) | |
6536 interface = lookup_interface (CLASS_SUPER_NAME (implementation)); | |
6537 else | |
6538 interface = NULL_TREE; | |
6539 } | |
6540 | |
6541 /* Now, interface is the superclass, if any; go check it. */ | |
6542 if (interface) | |
6543 { | |
6544 if (lookup_method_static (interface, chain, 0)) | |
6545 { | |
6546 chain = DECL_CHAIN (chain); | |
6547 continue; | |
6548 } | |
6549 } | |
6550 /* Else, fall through - warn. */ | |
6551 } | |
6552 if (first) | |
6553 { | |
6554 switch (TREE_CODE (implementation)) | |
6555 { | |
6556 case CLASS_IMPLEMENTATION_TYPE: | |
6557 warning (0, "incomplete implementation of class %qE", | |
6558 CLASS_NAME (implementation)); | |
6559 break; | |
6560 case CATEGORY_IMPLEMENTATION_TYPE: | |
6561 warning (0, "incomplete implementation of category %qE", | |
6562 CLASS_SUPER_NAME (implementation)); | |
6563 break; | |
6564 default: | |
6565 gcc_unreachable (); | |
6566 } | |
6567 first = 0; | |
6568 } | |
6569 | |
6570 warning (0, "method definition for %<%c%E%> not found", | |
6571 mtype, METHOD_SEL_NAME (chain)); | |
6572 } | |
6573 | |
6574 chain = DECL_CHAIN (chain); | |
6575 } | |
6576 | |
6577 return first; | |
6578 } | |
6579 | |
6580 /* Check if KLASS, or its superclasses, explicitly conforms to PROTOCOL. */ | |
6581 | |
6582 static int | |
6583 conforms_to_protocol (tree klass, tree protocol) | |
6584 { | |
6585 if (TREE_CODE (protocol) == PROTOCOL_INTERFACE_TYPE) | |
6586 { | |
6587 tree p = CLASS_PROTOCOL_LIST (klass); | |
6588 while (p && TREE_VALUE (p) != protocol) | |
6589 p = TREE_CHAIN (p); | |
6590 | |
6591 if (!p) | |
6592 { | |
6593 tree super = (CLASS_SUPER_NAME (klass) | |
6594 ? lookup_interface (CLASS_SUPER_NAME (klass)) | |
6595 : NULL_TREE); | |
6596 int tmp = super ? conforms_to_protocol (super, protocol) : 0; | |
6597 if (!tmp) | |
6598 return 0; | |
6599 } | |
6600 } | |
6601 | |
6602 return 1; | |
6603 } | |
6604 | |
6605 /* Make sure all methods in CHAIN are accessible as MTYPE methods in | |
6606 CONTEXT. This is one of two mechanisms to check protocol integrity. */ | |
6607 | |
6608 static int | |
6609 check_methods_accessible (tree chain, tree context, int mtype) | |
6610 { | |
6611 int first = 1; | |
6612 tree list; | |
6613 tree base_context = context; | |
6614 | |
6615 while (chain) | |
6616 { | |
6617 /* If the method is associated with a dynamic property, then it | |
6618 is Ok not to have the method implementation, as it will be | |
6619 generated dynamically at runtime. Search for any @dynamic | |
6620 property with the same setter or getter name as this | |
6621 method. TODO: Use a hashtable lookup. */ | |
6622 tree x; | |
6623 for (x = IMPL_PROPERTY_DECL (base_context); x; x = TREE_CHAIN (x)) | |
6624 if (PROPERTY_DYNAMIC (x) | |
6625 && (PROPERTY_GETTER_NAME (x) == METHOD_SEL_NAME (chain) | |
6626 || PROPERTY_SETTER_NAME (x) == METHOD_SEL_NAME (chain))) | |
6627 break; | |
6628 | |
6629 if (x != NULL_TREE) | |
6630 { | |
6631 chain = TREE_CHAIN (chain); /* next method... */ | |
6632 continue; | |
6633 } | |
6634 | |
6635 context = base_context; | |
6636 while (context) | |
6637 { | |
6638 if (mtype == '+') | |
6639 list = CLASS_CLS_METHODS (context); | |
6640 else | |
6641 list = CLASS_NST_METHODS (context); | |
6642 | |
6643 if (lookup_method (list, chain)) | |
6644 break; | |
6645 | |
6646 switch (TREE_CODE (context)) | |
6647 { | |
6648 case CLASS_IMPLEMENTATION_TYPE: | |
6649 case CLASS_INTERFACE_TYPE: | |
6650 context = (CLASS_SUPER_NAME (context) | |
6651 ? lookup_interface (CLASS_SUPER_NAME (context)) | |
6652 : NULL_TREE); | |
6653 break; | |
6654 case CATEGORY_IMPLEMENTATION_TYPE: | |
6655 case CATEGORY_INTERFACE_TYPE: | |
6656 context = (CLASS_NAME (context) | |
6657 ? lookup_interface (CLASS_NAME (context)) | |
6658 : NULL_TREE); | |
6659 break; | |
6660 default: | |
6661 gcc_unreachable (); | |
6662 } | |
6663 } | |
6664 | |
6665 if (context == NULL_TREE) | |
6666 { | |
6667 if (first) | |
6668 { | |
6669 switch (TREE_CODE (objc_implementation_context)) | |
6670 { | |
6671 case CLASS_IMPLEMENTATION_TYPE: | |
6672 warning (0, "incomplete implementation of class %qE", | |
6673 CLASS_NAME (objc_implementation_context)); | |
6674 break; | |
6675 case CATEGORY_IMPLEMENTATION_TYPE: | |
6676 warning (0, "incomplete implementation of category %qE", | |
6677 CLASS_SUPER_NAME (objc_implementation_context)); | |
6678 break; | |
6679 default: | |
6680 gcc_unreachable (); | |
6681 } | |
6682 first = 0; | |
6683 } | |
6684 warning (0, "method definition for %<%c%E%> not found", | |
6685 mtype, METHOD_SEL_NAME (chain)); | |
6686 } | |
6687 | |
6688 chain = TREE_CHAIN (chain); /* next method... */ | |
6689 } | |
6690 return first; | |
6691 } | |
6692 | |
6693 /* Check whether the current interface (accessible via | |
6694 'objc_implementation_context') actually implements protocol P, along | |
6695 with any protocols that P inherits. */ | |
6696 | |
6697 static void | |
6698 check_protocol (tree p, const char *type, tree name) | |
6699 { | |
6700 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) | |
6701 { | |
6702 int f1, f2; | |
6703 | |
6704 /* Ensure that all protocols have bodies! */ | |
6705 if (warn_protocol) | |
6706 { | |
6707 f1 = check_methods (PROTOCOL_CLS_METHODS (p), | |
6708 objc_implementation_context, | |
6709 '+'); | |
6710 f2 = check_methods (PROTOCOL_NST_METHODS (p), | |
6711 objc_implementation_context, | |
6712 '-'); | |
6713 } | |
6714 else | |
6715 { | |
6716 f1 = check_methods_accessible (PROTOCOL_CLS_METHODS (p), | |
6717 objc_implementation_context, | |
6718 '+'); | |
6719 f2 = check_methods_accessible (PROTOCOL_NST_METHODS (p), | |
6720 objc_implementation_context, | |
6721 '-'); | |
6722 } | |
6723 | |
6724 if (!f1 || !f2) | |
6725 warning (0, "%s %qE does not fully implement the %qE protocol", | |
6726 type, name, PROTOCOL_NAME (p)); | |
6727 } | |
6728 | |
6729 /* Check protocols recursively. */ | |
6730 if (PROTOCOL_LIST (p)) | |
6731 { | |
6732 tree subs = PROTOCOL_LIST (p); | |
6733 tree super_class = | |
6734 lookup_interface (CLASS_SUPER_NAME (implementation_template)); | |
6735 | |
6736 while (subs) | |
6737 { | |
6738 tree sub = TREE_VALUE (subs); | |
6739 | |
6740 /* If the superclass does not conform to the protocols | |
6741 inherited by P, then we must! */ | |
6742 if (!super_class || !conforms_to_protocol (super_class, sub)) | |
6743 check_protocol (sub, type, name); | |
6744 subs = TREE_CHAIN (subs); | |
6745 } | |
6746 } | |
6747 } | |
6748 | |
6749 /* Check whether the current interface (accessible via | |
6750 'objc_implementation_context') actually implements the protocols listed | |
6751 in PROTO_LIST. */ | |
6752 | |
6753 static void | |
6754 check_protocols (tree proto_list, const char *type, tree name) | |
6755 { | |
6756 for ( ; proto_list; proto_list = TREE_CHAIN (proto_list)) | |
6757 { | |
6758 tree p = TREE_VALUE (proto_list); | |
6759 | |
6760 check_protocol (p, type, name); | |
6761 } | |
6762 } | |
6763 | |
6764 /* Make sure that the class CLASS_NAME is defined CODE says which kind | |
6765 of thing CLASS_NAME ought to be. It can be CLASS_INTERFACE_TYPE, | |
6766 CLASS_IMPLEMENTATION_TYPE, CATEGORY_INTERFACE_TYPE, or | |
6767 CATEGORY_IMPLEMENTATION_TYPE. For a CATEGORY_INTERFACE_TYPE, | |
6768 SUPER_NAME is the name of the category. For a class extension, | |
6769 CODE is CATEGORY_INTERFACE_TYPE and SUPER_NAME is NULL_TREE. */ | |
6770 static tree | |
6771 start_class (enum tree_code code, tree class_name, tree super_name, | |
6772 tree protocol_list, tree attributes) | |
6773 { | |
6774 tree klass = NULL_TREE; | |
6775 tree decl; | |
6776 | |
6777 #ifdef OBJCPLUS | |
6778 if (current_namespace != global_namespace) | |
6779 { | |
6780 error ("Objective-C declarations may only appear in global scope"); | |
6781 } | |
6782 #endif /* OBJCPLUS */ | |
6783 | |
6784 if (objc_implementation_context) | |
6785 { | |
6786 warning (0, "%<@end%> missing in implementation context"); | |
6787 finish_class (objc_implementation_context); | |
6788 objc_ivar_chain = NULL_TREE; | |
6789 objc_implementation_context = NULL_TREE; | |
6790 } | |
6791 | |
6792 /* If this is a class extension, we'll be "reopening" the existing | |
6793 CLASS_INTERFACE_TYPE, so in that case there is no need to create | |
6794 a new node. */ | |
6795 if (code != CATEGORY_INTERFACE_TYPE || super_name != NULL_TREE) | |
6796 { | |
6797 klass = make_node (code); | |
6798 TYPE_LANG_SLOT_1 (klass) = make_tree_vec (CLASS_LANG_SLOT_ELTS); | |
6799 } | |
6800 | |
6801 /* Check for existence of the super class, if one was specified. Note | |
6802 that we must have seen an @interface, not just a @class. If we | |
6803 are looking at a @compatibility_alias, traverse it first. */ | |
6804 if ((code == CLASS_INTERFACE_TYPE || code == CLASS_IMPLEMENTATION_TYPE) | |
6805 && super_name) | |
6806 { | |
6807 tree super = objc_is_class_name (super_name); | |
6808 tree super_interface = NULL_TREE; | |
6809 | |
6810 if (super) | |
6811 super_interface = lookup_interface (super); | |
6812 | |
6813 if (!super_interface) | |
6814 { | |
6815 error ("cannot find interface declaration for %qE, superclass of %qE", | |
6816 super ? super : super_name, | |
6817 class_name); | |
6818 super_name = NULL_TREE; | |
6819 } | |
6820 else | |
6821 { | |
6822 if (TREE_DEPRECATED (super_interface)) | |
6823 warning (OPT_Wdeprecated_declarations, "class %qE is deprecated", | |
6824 super); | |
6825 super_name = super; | |
6826 } | |
6827 } | |
6828 | |
6829 if (code != CATEGORY_INTERFACE_TYPE || super_name != NULL_TREE) | |
6830 { | |
6831 CLASS_NAME (klass) = class_name; | |
6832 CLASS_SUPER_NAME (klass) = super_name; | |
6833 CLASS_CLS_METHODS (klass) = NULL_TREE; | |
6834 } | |
6835 | |
6836 if (! objc_is_class_name (class_name) | |
6837 && (decl = lookup_name (class_name))) | |
6838 { | |
6839 error ("%qE redeclared as different kind of symbol", | |
6840 class_name); | |
6841 error ("previous declaration of %q+D", | |
6842 decl); | |
6843 } | |
6844 | |
6845 switch (code) | |
6846 { | |
6847 case CLASS_IMPLEMENTATION_TYPE: | |
6848 { | |
6849 tree chain; | |
6850 | |
6851 for (chain = implemented_classes; chain; chain = TREE_CHAIN (chain)) | |
6852 if (TREE_VALUE (chain) == class_name) | |
6853 { | |
6854 error ("reimplementation of class %qE", | |
6855 class_name); | |
6856 /* TODO: error message saying where it was previously | |
6857 implemented. */ | |
6858 break; | |
6859 } | |
6860 if (chain == NULL_TREE) | |
6861 implemented_classes = tree_cons (NULL_TREE, class_name, | |
6862 implemented_classes); | |
6863 } | |
6864 | |
6865 /* Reset for multiple classes per file. */ | |
6866 method_slot = 0; | |
6867 | |
6868 objc_implementation_context = klass; | |
6869 | |
6870 /* Lookup the interface for this implementation. */ | |
6871 | |
6872 if (!(implementation_template = lookup_interface (class_name))) | |
6873 { | |
6874 warning (0, "cannot find interface declaration for %qE", | |
6875 class_name); | |
6876 add_interface (implementation_template = objc_implementation_context, | |
6877 class_name); | |
6878 } | |
6879 | |
6880 /* If a super class has been specified in the implementation, | |
6881 insure it conforms to the one specified in the interface. */ | |
6882 | |
6883 if (super_name | |
6884 && (super_name != CLASS_SUPER_NAME (implementation_template))) | |
6885 { | |
6886 tree previous_name = CLASS_SUPER_NAME (implementation_template); | |
6887 error ("conflicting super class name %qE", | |
6888 super_name); | |
6889 if (previous_name) | |
6890 error ("previous declaration of %qE", previous_name); | |
6891 else | |
6892 error ("previous declaration"); | |
6893 } | |
6894 | |
6895 else if (! super_name) | |
6896 { | |
6897 CLASS_SUPER_NAME (objc_implementation_context) | |
6898 = CLASS_SUPER_NAME (implementation_template); | |
6899 } | |
6900 break; | |
6901 | |
6902 case CLASS_INTERFACE_TYPE: | |
6903 if (lookup_interface (class_name)) | |
6904 #ifdef OBJCPLUS | |
6905 error ("duplicate interface declaration for class %qE", class_name); | |
6906 #else | |
6907 warning (0, "duplicate interface declaration for class %qE", class_name); | |
6908 #endif | |
6909 else | |
6910 add_interface (klass, class_name); | |
6911 | |
6912 if (protocol_list) | |
6913 CLASS_PROTOCOL_LIST (klass) | |
6914 = lookup_and_install_protocols (protocol_list, /* definition_required */ true); | |
6915 | |
6916 if (attributes) | |
6917 { | |
6918 tree attribute; | |
6919 for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) | |
6920 { | |
6921 tree name = TREE_PURPOSE (attribute); | |
6922 | |
6923 /* TODO: Document what the objc_exception attribute is/does. */ | |
6924 /* We handle the 'deprecated' and (undocumented) 'objc_exception' | |
6925 attributes. */ | |
6926 if (is_attribute_p ("deprecated", name)) | |
6927 TREE_DEPRECATED (klass) = 1; | |
6928 else if (is_attribute_p ("objc_exception", name)) | |
6929 CLASS_HAS_EXCEPTION_ATTR (klass) = 1; | |
6930 else | |
6931 /* Warn about and ignore all others for now, but store them. */ | |
6932 warning (OPT_Wattributes, "%qE attribute directive ignored", name); | |
6933 } | |
6934 TYPE_ATTRIBUTES (klass) = attributes; | |
6935 } | |
6936 break; | |
6937 | |
6938 case CATEGORY_INTERFACE_TYPE: | |
6939 { | |
6940 tree class_category_is_assoc_with; | |
6941 | |
6942 /* For a category, class_name is really the name of the class that | |
6943 the following set of methods will be associated with. We must | |
6944 find the interface so that can derive the objects template. */ | |
6945 if (!(class_category_is_assoc_with = lookup_interface (class_name))) | |
6946 { | |
6947 error ("cannot find interface declaration for %qE", | |
6948 class_name); | |
6949 exit (FATAL_EXIT_CODE); | |
6950 } | |
6951 else | |
6952 { | |
6953 if (TREE_DEPRECATED (class_category_is_assoc_with)) | |
6954 warning (OPT_Wdeprecated_declarations, "class %qE is deprecated", | |
6955 class_name); | |
6956 | |
6957 if (super_name == NULL_TREE) | |
6958 { | |
6959 /* This is a class extension. Get the original | |
6960 interface, and continue working on it. */ | |
6961 objc_in_class_extension = true; | |
6962 klass = class_category_is_assoc_with; | |
6963 | |
6964 if (protocol_list) | |
6965 { | |
6966 /* Append protocols to the original protocol | |
6967 list. */ | |
6968 CLASS_PROTOCOL_LIST (klass) | |
6969 = chainon (CLASS_PROTOCOL_LIST (klass), | |
6970 lookup_and_install_protocols | |
6971 (protocol_list, | |
6972 /* definition_required */ true)); | |
6973 } | |
6974 } | |
6975 else | |
6976 { | |
6977 add_category (class_category_is_assoc_with, klass); | |
6978 | |
6979 if (protocol_list) | |
6980 CLASS_PROTOCOL_LIST (klass) | |
6981 = lookup_and_install_protocols | |
6982 (protocol_list, /* definition_required */ true); | |
6983 } | |
6984 } | |
6985 } | |
6986 break; | |
6987 | |
6988 case CATEGORY_IMPLEMENTATION_TYPE: | |
6989 /* Reset for multiple classes per file. */ | |
6990 method_slot = 0; | |
6991 | |
6992 objc_implementation_context = klass; | |
6993 | |
6994 /* For a category, class_name is really the name of the class that | |
6995 the following set of methods will be associated with. We must | |
6996 find the interface so that can derive the objects template. */ | |
6997 | |
6998 if (!(implementation_template = lookup_interface (class_name))) | |
6999 { | |
7000 error ("cannot find interface declaration for %qE", | |
7001 class_name); | |
7002 exit (FATAL_EXIT_CODE); | |
7003 } | |
7004 break; | |
7005 default: | |
7006 gcc_unreachable (); | |
7007 } | |
7008 return klass; | |
7009 } | |
7010 | |
7011 static tree | |
7012 continue_class (tree klass) | |
7013 { | |
7014 switch (TREE_CODE (klass)) | |
7015 { | |
7016 case CLASS_IMPLEMENTATION_TYPE: | |
7017 case CATEGORY_IMPLEMENTATION_TYPE: | |
7018 { | |
7019 struct imp_entry *imp_entry; | |
7020 | |
7021 /* Check consistency of the instance variables. */ | |
7022 | |
7023 if (CLASS_RAW_IVARS (klass)) | |
7024 check_ivars (implementation_template, klass); | |
7025 | |
7026 /* code generation */ | |
7027 #ifdef OBJCPLUS | |
7028 push_lang_context (lang_name_c); | |
7029 #endif | |
7030 build_private_template (implementation_template); | |
7031 uprivate_record = CLASS_STATIC_TEMPLATE (implementation_template); | |
7032 objc_instance_type = build_pointer_type (uprivate_record); | |
7033 | |
7034 imp_entry = ggc_alloc<struct imp_entry> (); | |
7035 | |
7036 imp_entry->next = imp_list; | |
7037 imp_entry->imp_context = klass; | |
7038 imp_entry->imp_template = implementation_template; | |
7039 ucls_super_ref = uucls_super_ref = NULL; | |
7040 if (TREE_CODE (klass) == CLASS_IMPLEMENTATION_TYPE) | |
7041 { | |
7042 imp_entry->class_decl = (*runtime.class_decl) (klass); | |
7043 imp_entry->meta_decl = (*runtime.metaclass_decl) (klass); | |
7044 } | |
7045 else | |
7046 { | |
7047 imp_entry->class_decl = (*runtime.category_decl) (klass); | |
7048 imp_entry->meta_decl = NULL; | |
7049 } | |
7050 imp_entry->has_cxx_cdtors = 0; | |
7051 | |
7052 /* Append to front and increment count. */ | |
7053 imp_list = imp_entry; | |
7054 if (TREE_CODE (klass) == CLASS_IMPLEMENTATION_TYPE) | |
7055 imp_count++; | |
7056 else | |
7057 cat_count++; | |
7058 #ifdef OBJCPLUS | |
7059 pop_lang_context (); | |
7060 #endif /* OBJCPLUS */ | |
7061 | |
7062 return get_class_ivars (implementation_template, true); | |
7063 } | |
7064 case CLASS_INTERFACE_TYPE: | |
7065 { | |
7066 if (objc_in_class_extension) | |
7067 return NULL_TREE; | |
7068 #ifdef OBJCPLUS | |
7069 push_lang_context (lang_name_c); | |
7070 #endif /* OBJCPLUS */ | |
7071 objc_collecting_ivars = 1; | |
7072 build_private_template (klass); | |
7073 objc_collecting_ivars = 0; | |
7074 #ifdef OBJCPLUS | |
7075 pop_lang_context (); | |
7076 #endif /* OBJCPLUS */ | |
7077 return NULL_TREE; | |
7078 } | |
7079 default: | |
7080 return error_mark_node; | |
7081 } | |
7082 } | |
7083 | |
7084 /* This routine builds name of the setter synthesized function. */ | |
7085 char * | |
7086 objc_build_property_setter_name (tree ident) | |
7087 { | |
7088 /* TODO: Use alloca to allocate buffer of appropriate size. */ | |
7089 static char string[BUFSIZE]; | |
7090 sprintf (string, "set%s:", IDENTIFIER_POINTER (ident)); | |
7091 string[3] = TOUPPER (string[3]); | |
7092 return string; | |
7093 } | |
7094 | |
7095 /* This routine prepares the declarations of the property accessor | |
7096 helper functions (objc_getProperty(), etc) that are used when | |
7097 @synthesize is used. | |
7098 | |
7099 runtime-specific routines are built in the respective runtime | |
7100 initialize functions. */ | |
7101 static void | |
7102 build_common_objc_property_accessor_helpers (void) | |
7103 { | |
7104 tree type; | |
7105 | |
7106 /* Declare the following function: | |
7107 id | |
7108 objc_getProperty (id self, SEL _cmd, | |
7109 ptrdiff_t offset, BOOL is_atomic); */ | |
7110 type = build_function_type_list (objc_object_type, | |
7111 objc_object_type, | |
7112 objc_selector_type, | |
7113 ptrdiff_type_node, | |
7114 boolean_type_node, | |
7115 NULL_TREE); | |
7116 objc_getProperty_decl = add_builtin_function ("objc_getProperty", | |
7117 type, 0, NOT_BUILT_IN, | |
7118 NULL, NULL_TREE); | |
7119 TREE_NOTHROW (objc_getProperty_decl) = 0; | |
7120 | |
7121 /* Declare the following function: | |
7122 void | |
7123 objc_setProperty (id self, SEL _cmd, | |
7124 ptrdiff_t offset, id new_value, | |
7125 BOOL is_atomic, BOOL should_copy); */ | |
7126 type = build_function_type_list (void_type_node, | |
7127 objc_object_type, | |
7128 objc_selector_type, | |
7129 ptrdiff_type_node, | |
7130 objc_object_type, | |
7131 boolean_type_node, | |
7132 boolean_type_node, | |
7133 NULL_TREE); | |
7134 objc_setProperty_decl = add_builtin_function ("objc_setProperty", | |
7135 type, 0, NOT_BUILT_IN, | |
7136 NULL, NULL_TREE); | |
7137 TREE_NOTHROW (objc_setProperty_decl) = 0; | |
7138 } | |
7139 | |
7140 /* This looks up an ivar in a class (including superclasses). */ | |
7141 static tree | |
7142 lookup_ivar (tree interface, tree instance_variable_name) | |
7143 { | |
7144 while (interface) | |
7145 { | |
7146 tree decl_chain; | |
7147 | |
7148 for (decl_chain = CLASS_IVARS (interface); decl_chain; decl_chain = DECL_CHAIN (decl_chain)) | |
7149 if (DECL_NAME (decl_chain) == instance_variable_name) | |
7150 return decl_chain; | |
7151 | |
7152 /* Not found. Search superclass if any. */ | |
7153 if (CLASS_SUPER_NAME (interface)) | |
7154 interface = lookup_interface (CLASS_SUPER_NAME (interface)); | |
7155 } | |
7156 | |
7157 return NULL_TREE; | |
7158 } | |
7159 | |
7160 /* This routine synthesizes a 'getter' method. This is only called | |
7161 for @synthesize properties. */ | |
7162 static void | |
7163 objc_synthesize_getter (tree klass, tree class_methods ATTRIBUTE_UNUSED, tree property) | |
7164 { | |
7165 location_t location = DECL_SOURCE_LOCATION (property); | |
7166 tree fn, decl; | |
7167 tree body; | |
7168 tree ret_val; | |
7169 | |
7170 /* If user has implemented a getter with same name then do nothing. */ | |
7171 if (lookup_method (CLASS_NST_METHODS (objc_implementation_context), | |
7172 PROPERTY_GETTER_NAME (property))) | |
7173 return; | |
7174 | |
7175 /* Find declaration of the property getter in the interface (or | |
7176 superclass, or protocol). There must be one. */ | |
7177 decl = lookup_method_static (klass, PROPERTY_GETTER_NAME (property), 0); | |
7178 | |
7179 /* If one not declared in the interface, this condition has already | |
7180 been reported as user error (because property was not declared in | |
7181 the interface). */ | |
7182 if (!decl) | |
7183 return; | |
7184 | |
7185 /* Adapt the 'decl'. Use the source location of the @synthesize | |
7186 statement for error messages. */ | |
7187 decl = copy_node (decl); | |
7188 DECL_SOURCE_LOCATION (decl) = location; | |
7189 | |
7190 objc_start_method_definition (false /* is_class_method */, decl, NULL_TREE, | |
7191 NULL_TREE); | |
7192 body = c_begin_compound_stmt (true); | |
7193 | |
7194 /* Now we need to decide how we build the getter. There are three | |
7195 cases: | |
7196 | |
7197 for 'copy' or 'retain' properties we need to use the | |
7198 objc_getProperty() accessor helper which knows about retain and | |
7199 copy. It supports both 'nonatomic' and 'atomic' access. | |
7200 | |
7201 for 'nonatomic, assign' properties we can access the instance | |
7202 variable directly. 'nonatomic' means we don't have to use locks, | |
7203 and 'assign' means we don't have to worry about retain or copy. | |
7204 If you combine the two, it means we can just access the instance | |
7205 variable directly. | |
7206 | |
7207 for 'atomic, assign' properties we use objc_copyStruct() (for the | |
7208 next runtime) or objc_getPropertyStruct() (for the GNU runtime). */ | |
7209 switch (PROPERTY_ASSIGN_SEMANTICS (property)) | |
7210 { | |
7211 case OBJC_PROPERTY_RETAIN: | |
7212 case OBJC_PROPERTY_COPY: | |
7213 { | |
7214 /* We build "return objc_getProperty (self, _cmd, offset, is_atomic);" */ | |
7215 tree cmd, ivar, offset, is_atomic; | |
7216 cmd = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl)); | |
7217 | |
7218 /* Find the ivar to compute the offset. */ | |
7219 ivar = lookup_ivar (klass, PROPERTY_IVAR_NAME (property)); | |
7220 if (!ivar || is_private (ivar)) | |
7221 { | |
7222 /* This should never happen. */ | |
7223 error_at (location, | |
7224 "can not find instance variable associated with property"); | |
7225 ret_val = error_mark_node; | |
7226 break; | |
7227 } | |
7228 offset = byte_position (ivar); | |
7229 | |
7230 if (PROPERTY_NONATOMIC (property)) | |
7231 is_atomic = boolean_false_node; | |
7232 else | |
7233 is_atomic = boolean_true_node; | |
7234 | |
7235 ret_val = build_function_call | |
7236 (location, | |
7237 /* Function prototype. */ | |
7238 objc_getProperty_decl, | |
7239 /* Parameters. */ | |
7240 tree_cons /* self */ | |
7241 (NULL_TREE, self_decl, | |
7242 tree_cons /* _cmd */ | |
7243 (NULL_TREE, cmd, | |
7244 tree_cons /* offset */ | |
7245 (NULL_TREE, offset, | |
7246 tree_cons /* is_atomic */ | |
7247 (NULL_TREE, is_atomic, NULL_TREE))))); | |
7248 } | |
7249 break; | |
7250 case OBJC_PROPERTY_ASSIGN: | |
7251 if (PROPERTY_NONATOMIC (property)) | |
7252 { | |
7253 /* We build "return self->PROPERTY_IVAR_NAME;" */ | |
7254 ret_val = objc_lookup_ivar (NULL_TREE, PROPERTY_IVAR_NAME (property)); | |
7255 break; | |
7256 } | |
7257 else | |
7258 { | |
7259 /* We build | |
7260 <property type> __objc_property_temp; | |
7261 objc_getPropertyStruct (&__objc_property_temp, | |
7262 &(self->PROPERTY_IVAR_NAME), | |
7263 sizeof (type of self->PROPERTY_IVAR_NAME), | |
7264 is_atomic, | |
7265 false) | |
7266 return __objc_property_temp; | |
7267 | |
7268 For the NeXT runtime, we need to use objc_copyStruct | |
7269 instead of objc_getPropertyStruct. */ | |
7270 tree objc_property_temp_decl, function_decl, function_call; | |
7271 tree size_of, is_atomic; | |
7272 | |
7273 objc_property_temp_decl = objc_create_temporary_var (TREE_TYPE (property), "__objc_property_temp"); | |
7274 DECL_SOURCE_LOCATION (objc_property_temp_decl) = location; | |
7275 objc_property_temp_decl = lang_hooks.decls.pushdecl (objc_property_temp_decl); | |
7276 | |
7277 /* sizeof (ivar type). Since the ivar and the property have | |
7278 the same type, there is no need to lookup the ivar. */ | |
7279 size_of = c_sizeof_or_alignof_type (location, TREE_TYPE (property), | |
7280 true /* is_sizeof */, | |
7281 false /* min_alignof */, | |
7282 false /* complain */); | |
7283 | |
7284 if (PROPERTY_NONATOMIC (property)) | |
7285 is_atomic = boolean_false_node; | |
7286 else | |
7287 is_atomic = boolean_true_node; | |
7288 | |
7289 if (objc_copyStruct_decl) | |
7290 function_decl = objc_copyStruct_decl; | |
7291 else | |
7292 function_decl = objc_getPropertyStruct_decl; | |
7293 | |
7294 function_call = build_function_call | |
7295 (location, | |
7296 /* Function prototype. */ | |
7297 function_decl, | |
7298 /* Parameters. */ | |
7299 tree_cons /* &__objc_property_temp_decl */ | |
7300 /* Warning: note that using build_fold_addr_expr_loc() | |
7301 here causes invalid code to be generated. */ | |
7302 (NULL_TREE, build_unary_op (location, ADDR_EXPR, objc_property_temp_decl, 0), | |
7303 tree_cons /* &(self->PROPERTY_IVAR_NAME); */ | |
7304 (NULL_TREE, build_fold_addr_expr_loc (location, | |
7305 objc_lookup_ivar | |
7306 (NULL_TREE, PROPERTY_IVAR_NAME (property))), | |
7307 tree_cons /* sizeof (PROPERTY_IVAR) */ | |
7308 (NULL_TREE, size_of, | |
7309 tree_cons /* is_atomic */ | |
7310 (NULL_TREE, is_atomic, | |
7311 /* TODO: This is currently ignored by the GNU | |
7312 runtime, but what about the next one ? */ | |
7313 tree_cons /* has_strong */ | |
7314 (NULL_TREE, boolean_true_node, NULL_TREE)))))); | |
7315 | |
7316 add_stmt (function_call); | |
7317 | |
7318 ret_val = objc_property_temp_decl; | |
7319 } | |
7320 break; | |
7321 default: | |
7322 gcc_unreachable (); | |
7323 } | |
7324 | |
7325 gcc_assert (ret_val); | |
7326 | |
7327 #ifdef OBJCPLUS | |
7328 finish_return_stmt (ret_val); | |
7329 #else | |
7330 c_finish_return (location, ret_val, NULL_TREE); | |
7331 #endif | |
7332 | |
7333 add_stmt (c_end_compound_stmt (location, body, true)); | |
7334 fn = current_function_decl; | |
7335 #ifdef OBJCPLUS | |
7336 finish_function (); | |
7337 #endif | |
7338 objc_finish_method_definition (fn); | |
7339 } | |
7340 | |
7341 /* This routine synthesizes a 'setter' method. */ | |
7342 | |
7343 static void | |
7344 objc_synthesize_setter (tree klass, tree class_methods ATTRIBUTE_UNUSED, tree property) | |
7345 { | |
7346 location_t location = DECL_SOURCE_LOCATION (property); | |
7347 tree fn, decl; | |
7348 tree body; | |
7349 tree new_value, statement; | |
7350 | |
7351 /* If user has implemented a setter with same name then do nothing. */ | |
7352 if (lookup_method (CLASS_NST_METHODS (objc_implementation_context), | |
7353 PROPERTY_SETTER_NAME (property))) | |
7354 return; | |
7355 | |
7356 /* Find declaration of the property setter in the interface (or | |
7357 superclass, or protocol). There must be one. */ | |
7358 decl = lookup_method_static (klass, PROPERTY_SETTER_NAME (property), 0); | |
7359 | |
7360 /* If one not declared in the interface, this condition has already | |
7361 been reported as user error (because property was not declared in | |
7362 the interface). */ | |
7363 if (!decl) | |
7364 return; | |
7365 | |
7366 /* Adapt the 'decl'. Use the source location of the @synthesize | |
7367 statement for error messages. */ | |
7368 decl = copy_node (decl); | |
7369 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (property); | |
7370 | |
7371 objc_start_method_definition (false /* is_class_method */, decl, NULL_TREE, | |
7372 NULL_TREE); | |
7373 | |
7374 body = c_begin_compound_stmt (true); | |
7375 | |
7376 /* The 'new_value' is the only argument to the method, which is the | |
7377 3rd argument of the function, after self and _cmd. We use twice | |
7378 TREE_CHAIN to move forward two arguments. */ | |
7379 new_value = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (current_function_decl))); | |
7380 | |
7381 /* This would presumably happen if the user has specified a | |
7382 prototype for the setter that does not have an argument! */ | |
7383 if (new_value == NULL_TREE) | |
7384 { | |
7385 /* TODO: This should be caught much earlier than this. */ | |
7386 error_at (DECL_SOURCE_LOCATION (decl), "invalid setter, it must have one argument"); | |
7387 /* Try to recover somehow. */ | |
7388 new_value = error_mark_node; | |
7389 } | |
7390 | |
7391 /* Now we need to decide how we build the setter. There are three | |
7392 cases: | |
7393 | |
7394 for 'copy' or 'retain' properties we need to use the | |
7395 objc_setProperty() accessor helper which knows about retain and | |
7396 copy. It supports both 'nonatomic' and 'atomic' access. | |
7397 | |
7398 for 'nonatomic, assign' properties we can access the instance | |
7399 variable directly. 'nonatomic' means we don't have to use locks, | |
7400 and 'assign' means we don't have to worry about retain or copy. | |
7401 If you combine the two, it means we can just access the instance | |
7402 variable directly. | |
7403 | |
7404 for 'atomic, assign' properties we use objc_copyStruct() (for the | |
7405 next runtime) or objc_setPropertyStruct() (for the GNU runtime). */ | |
7406 switch (PROPERTY_ASSIGN_SEMANTICS (property)) | |
7407 { | |
7408 case OBJC_PROPERTY_RETAIN: | |
7409 case OBJC_PROPERTY_COPY: | |
7410 { | |
7411 /* We build "objc_setProperty (self, _cmd, new_value, offset, is_atomic, should_copy);" */ | |
7412 tree cmd, ivar, offset, is_atomic, should_copy; | |
7413 cmd = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl)); | |
7414 | |
7415 /* Find the ivar to compute the offset. */ | |
7416 ivar = lookup_ivar (klass, PROPERTY_IVAR_NAME (property)); | |
7417 if (!ivar || is_private (ivar)) | |
7418 { | |
7419 error_at (location, | |
7420 "can not find instance variable associated with property"); | |
7421 statement = error_mark_node; | |
7422 break; | |
7423 } | |
7424 offset = byte_position (ivar); | |
7425 | |
7426 if (PROPERTY_NONATOMIC (property)) | |
7427 is_atomic = boolean_false_node; | |
7428 else | |
7429 is_atomic = boolean_true_node; | |
7430 | |
7431 if (PROPERTY_ASSIGN_SEMANTICS (property) == OBJC_PROPERTY_COPY) | |
7432 should_copy = boolean_true_node; | |
7433 else | |
7434 should_copy = boolean_false_node; | |
7435 | |
7436 statement = build_function_call | |
7437 (location, | |
7438 /* Function prototype. */ | |
7439 objc_setProperty_decl, | |
7440 /* Parameters. */ | |
7441 tree_cons /* self */ | |
7442 (NULL_TREE, self_decl, | |
7443 tree_cons /* _cmd */ | |
7444 (NULL_TREE, cmd, | |
7445 tree_cons /* offset */ | |
7446 (NULL_TREE, offset, | |
7447 tree_cons /* new_value */ | |
7448 (NULL_TREE, new_value, | |
7449 tree_cons /* is_atomic */ | |
7450 (NULL_TREE, is_atomic, | |
7451 tree_cons /* should_copy */ | |
7452 (NULL_TREE, should_copy, NULL_TREE))))))); | |
7453 } | |
7454 break; | |
7455 case OBJC_PROPERTY_ASSIGN: | |
7456 if (PROPERTY_NONATOMIC (property)) | |
7457 { | |
7458 /* We build "self->PROPERTY_IVAR_NAME = new_value;" */ | |
7459 statement = build_modify_expr | |
7460 (location, | |
7461 objc_lookup_ivar (NULL_TREE, PROPERTY_IVAR_NAME (property)), | |
7462 NULL_TREE, NOP_EXPR, | |
7463 location, new_value, NULL_TREE); | |
7464 break; | |
7465 } | |
7466 else | |
7467 { | |
7468 /* We build | |
7469 objc_setPropertyStruct (&(self->PROPERTY_IVAR_NAME), | |
7470 &new_value, | |
7471 sizeof (type of self->PROPERTY_IVAR_NAME), | |
7472 is_atomic, | |
7473 false) | |
7474 | |
7475 For the NeXT runtime, we need to use objc_copyStruct | |
7476 instead of objc_getPropertyStruct. */ | |
7477 tree function_decl, size_of, is_atomic; | |
7478 | |
7479 /* sizeof (ivar type). Since the ivar and the property have | |
7480 the same type, there is no need to lookup the ivar. */ | |
7481 size_of = c_sizeof_or_alignof_type (location, TREE_TYPE (property), | |
7482 true /* is_sizeof */, | |
7483 false /* min_alignof */, | |
7484 false /* complain */); | |
7485 | |
7486 if (PROPERTY_NONATOMIC (property)) | |
7487 is_atomic = boolean_false_node; | |
7488 else | |
7489 is_atomic = boolean_true_node; | |
7490 | |
7491 if (objc_copyStruct_decl) | |
7492 function_decl = objc_copyStruct_decl; | |
7493 else | |
7494 function_decl = objc_setPropertyStruct_decl; | |
7495 | |
7496 statement = build_function_call | |
7497 (location, | |
7498 /* Function prototype. */ | |
7499 function_decl, | |
7500 /* Parameters. */ | |
7501 tree_cons /* &(self->PROPERTY_IVAR_NAME); */ | |
7502 (NULL_TREE, build_fold_addr_expr_loc (location, | |
7503 objc_lookup_ivar | |
7504 (NULL_TREE, PROPERTY_IVAR_NAME (property))), | |
7505 tree_cons /* &new_value */ | |
7506 (NULL_TREE, build_fold_addr_expr_loc (location, new_value), | |
7507 tree_cons /* sizeof (PROPERTY_IVAR) */ | |
7508 (NULL_TREE, size_of, | |
7509 tree_cons /* is_atomic */ | |
7510 (NULL_TREE, is_atomic, | |
7511 /* TODO: This is currently ignored by the GNU | |
7512 runtime, but what about the next one ? */ | |
7513 tree_cons /* has_strong */ | |
7514 (NULL_TREE, boolean_true_node, NULL_TREE)))))); | |
7515 } | |
7516 break; | |
7517 default: | |
7518 gcc_unreachable (); | |
7519 } | |
7520 gcc_assert (statement); | |
7521 | |
7522 add_stmt (statement); | |
7523 add_stmt (c_end_compound_stmt (location, body, true)); | |
7524 fn = current_function_decl; | |
7525 #ifdef OBJCPLUS | |
7526 finish_function (); | |
7527 #endif | |
7528 objc_finish_method_definition (fn); | |
7529 } | |
7530 | |
7531 /* This function is a sub-routine of objc_add_synthesize_declaration. | |
7532 It is called for each property to synthesize once we have | |
7533 determined that the context is Ok. */ | |
7534 static void | |
7535 objc_add_synthesize_declaration_for_property (location_t location, tree interface, | |
7536 tree property_name, tree ivar_name) | |
7537 { | |
7538 /* Find the @property declaration. */ | |
7539 tree property; | |
7540 tree x; | |
7541 | |
7542 /* Check that synthesize or dynamic has not already been used for | |
7543 the same property. */ | |
7544 for (property = IMPL_PROPERTY_DECL (objc_implementation_context); property; property = TREE_CHAIN (property)) | |
7545 if (PROPERTY_NAME (property) == property_name) | |
7546 { | |
7547 location_t original_location = DECL_SOURCE_LOCATION (property); | |
7548 | |
7549 if (PROPERTY_DYNAMIC (property)) | |
7550 error_at (location, "property %qs already specified in %<@dynamic%>", | |
7551 IDENTIFIER_POINTER (property_name)); | |
7552 else | |
7553 error_at (location, "property %qs already specified in %<@synthesize%>", | |
7554 IDENTIFIER_POINTER (property_name)); | |
7555 | |
7556 if (original_location != UNKNOWN_LOCATION) | |
7557 inform (original_location, "originally specified here"); | |
7558 return; | |
7559 } | |
7560 | |
7561 /* Check that the property is declared in the interface. It could | |
7562 also be declared in a superclass or protocol. */ | |
7563 property = lookup_property (interface, property_name); | |
7564 | |
7565 if (!property) | |
7566 { | |
7567 error_at (location, "no declaration of property %qs found in the interface", | |
7568 IDENTIFIER_POINTER (property_name)); | |
7569 return; | |
7570 } | |
7571 else | |
7572 { | |
7573 /* We have to copy the property, because we want to chain it to | |
7574 the implementation context, and we want to store the source | |
7575 location of the @synthesize, not of the original | |
7576 @property. */ | |
7577 property = copy_node (property); | |
7578 DECL_SOURCE_LOCATION (property) = location; | |
7579 } | |
7580 | |
7581 /* Determine PROPERTY_IVAR_NAME. */ | |
7582 if (ivar_name == NULL_TREE) | |
7583 ivar_name = property_name; | |
7584 | |
7585 /* Check that the instance variable exists. You can only use an | |
7586 instance variable from the same class, not one from the | |
7587 superclass (this makes sense as it allows us to check that an | |
7588 instance variable is only used in one synthesized property). */ | |
7589 { | |
7590 tree ivar = is_ivar (CLASS_IVARS (interface), ivar_name); | |
7591 tree type_of_ivar; | |
7592 if (!ivar) | |
7593 { | |
7594 error_at (location, "ivar %qs used by %<@synthesize%> declaration must be an existing ivar", | |
7595 IDENTIFIER_POINTER (property_name)); | |
7596 return; | |
7597 } | |
7598 | |
7599 if (DECL_BIT_FIELD_TYPE (ivar)) | |
7600 type_of_ivar = DECL_BIT_FIELD_TYPE (ivar); | |
7601 else | |
7602 type_of_ivar = TREE_TYPE (ivar); | |
7603 | |
7604 /* If the instance variable has a different C type, we throw an error ... */ | |
7605 if (!comptypes (TREE_TYPE (property), type_of_ivar) | |
7606 /* ... unless the property is readonly, in which case we allow | |
7607 the instance variable to be more specialized (this means we | |
7608 can generate the getter all right and it works). */ | |
7609 && (!PROPERTY_READONLY (property) | |
7610 || !objc_compare_types (TREE_TYPE (property), | |
7611 type_of_ivar, -5, NULL_TREE))) | |
7612 { | |
7613 location_t original_location = DECL_SOURCE_LOCATION (ivar); | |
7614 | |
7615 error_at (location, "property %qs is using instance variable %qs of incompatible type", | |
7616 IDENTIFIER_POINTER (property_name), | |
7617 IDENTIFIER_POINTER (ivar_name)); | |
7618 | |
7619 if (original_location != UNKNOWN_LOCATION) | |
7620 inform (original_location, "originally specified here"); | |
7621 } | |
7622 | |
7623 /* If the instance variable is a bitfield, the property must be | |
7624 'assign', 'nonatomic' because the runtime getter/setter helper | |
7625 do not work with bitfield instance variables. */ | |
7626 if (DECL_BIT_FIELD_TYPE (ivar)) | |
7627 { | |
7628 /* If there is an error, we return and not generate any | |
7629 getter/setter because trying to set up the runtime | |
7630 getter/setter helper calls with bitfields is at high risk | |
7631 of ICE. */ | |
7632 | |
7633 if (PROPERTY_ASSIGN_SEMANTICS (property) != OBJC_PROPERTY_ASSIGN) | |
7634 { | |
7635 location_t original_location = DECL_SOURCE_LOCATION (ivar); | |
7636 | |
7637 error_at (location, "'assign' property %qs is using bit-field instance variable %qs", | |
7638 IDENTIFIER_POINTER (property_name), | |
7639 IDENTIFIER_POINTER (ivar_name)); | |
7640 | |
7641 if (original_location != UNKNOWN_LOCATION) | |
7642 inform (original_location, "originally specified here"); | |
7643 return; | |
7644 } | |
7645 | |
7646 if (!PROPERTY_NONATOMIC (property)) | |
7647 { | |
7648 location_t original_location = DECL_SOURCE_LOCATION (ivar); | |
7649 | |
7650 error_at (location, "'atomic' property %qs is using bit-field instance variable %qs", | |
7651 IDENTIFIER_POINTER (property_name), | |
7652 IDENTIFIER_POINTER (ivar_name)); | |
7653 | |
7654 if (original_location != UNKNOWN_LOCATION) | |
7655 inform (original_location, "originally specified here"); | |
7656 return; | |
7657 } | |
7658 } | |
7659 } | |
7660 | |
7661 /* Check that no other property is using the same instance | |
7662 variable. */ | |
7663 for (x = IMPL_PROPERTY_DECL (objc_implementation_context); x; x = TREE_CHAIN (x)) | |
7664 if (PROPERTY_IVAR_NAME (x) == ivar_name) | |
7665 { | |
7666 location_t original_location = DECL_SOURCE_LOCATION (x); | |
7667 | |
7668 error_at (location, "property %qs is using the same instance variable as property %qs", | |
7669 IDENTIFIER_POINTER (property_name), | |
7670 IDENTIFIER_POINTER (PROPERTY_NAME (x))); | |
7671 | |
7672 if (original_location != UNKNOWN_LOCATION) | |
7673 inform (original_location, "originally specified here"); | |
7674 | |
7675 /* We keep going on. This won't cause the compiler to fail; | |
7676 the failure would most likely be at runtime. */ | |
7677 } | |
7678 | |
7679 /* Note that a @synthesize (and only a @synthesize) always sets | |
7680 PROPERTY_IVAR_NAME to a non-NULL_TREE. You can recognize a | |
7681 @synthesize by that. */ | |
7682 PROPERTY_IVAR_NAME (property) = ivar_name; | |
7683 | |
7684 /* PROPERTY_SETTER_NAME and PROPERTY_GETTER_NAME are copied from the | |
7685 original declaration; they are always set (with the exception of | |
7686 PROPERTY_SETTER_NAME not being set if PROPERTY_READONLY == 1). */ | |
7687 | |
7688 /* Add the property to the list of properties for current implementation. */ | |
7689 TREE_CHAIN (property) = IMPL_PROPERTY_DECL (objc_implementation_context); | |
7690 IMPL_PROPERTY_DECL (objc_implementation_context) = property; | |
7691 | |
7692 /* Note how we don't actually synthesize the getter/setter here; it | |
7693 would be very natural, but we may miss the fact that the user has | |
7694 implemented his own getter/setter later on in the @implementation | |
7695 (in which case we shouldn't generate getter/setter). We wait | |
7696 until we have parsed it all before generating the code. */ | |
7697 } | |
7698 | |
7699 /* This function is called by the parser after a @synthesize | |
7700 expression is parsed. 'location' is the location of the | |
7701 @synthesize expression, and 'property_and_ivar_list' is a chained | |
7702 list of the property and ivar names. */ | |
7703 void | |
7704 objc_add_synthesize_declaration (location_t location, tree property_and_ivar_list) | |
7705 { | |
7706 tree interface, chain; | |
7707 | |
7708 if (flag_objc1_only) | |
7709 error_at (input_location, "%<@synthesize%> is not available in Objective-C 1.0"); | |
7710 | |
7711 if (property_and_ivar_list == error_mark_node) | |
7712 return; | |
7713 | |
7714 if (!objc_implementation_context) | |
7715 { | |
7716 /* We can get here only in Objective-C; the Objective-C++ parser | |
7717 detects the problem while parsing, outputs the error | |
7718 "misplaced '@synthesize' Objective-C++ construct" and skips | |
7719 the declaration. */ | |
7720 error_at (location, "%<@synthesize%> not in @implementation context"); | |
7721 return; | |
7722 } | |
7723 | |
7724 if (TREE_CODE (objc_implementation_context) == CATEGORY_IMPLEMENTATION_TYPE) | |
7725 { | |
7726 error_at (location, "%<@synthesize%> can not be used in categories"); | |
7727 return; | |
7728 } | |
7729 | |
7730 interface = lookup_interface (CLASS_NAME (objc_implementation_context)); | |
7731 if (!interface) | |
7732 { | |
7733 /* I can't see how this could happen, but it is good as a safety check. */ | |
7734 error_at (location, | |
7735 "%<@synthesize%> requires the @interface of the class to be available"); | |
7736 return; | |
7737 } | |
7738 | |
7739 /* Now, iterate over the properties and do each of them. */ | |
7740 for (chain = property_and_ivar_list; chain; chain = TREE_CHAIN (chain)) | |
7741 { | |
7742 objc_add_synthesize_declaration_for_property (location, interface, TREE_VALUE (chain), | |
7743 TREE_PURPOSE (chain)); | |
7744 } | |
7745 } | |
7746 | |
7747 /* This function is a sub-routine of objc_add_dynamic_declaration. It | |
7748 is called for each property to mark as dynamic once we have | |
7749 determined that the context is Ok. */ | |
7750 static void | |
7751 objc_add_dynamic_declaration_for_property (location_t location, tree interface, | |
7752 tree property_name) | |
7753 { | |
7754 /* Find the @property declaration. */ | |
7755 tree property; | |
7756 | |
7757 /* Check that synthesize or dynamic has not already been used for | |
7758 the same property. */ | |
7759 for (property = IMPL_PROPERTY_DECL (objc_implementation_context); property; property = TREE_CHAIN (property)) | |
7760 if (PROPERTY_NAME (property) == property_name) | |
7761 { | |
7762 location_t original_location = DECL_SOURCE_LOCATION (property); | |
7763 | |
7764 if (PROPERTY_DYNAMIC (property)) | |
7765 error_at (location, "property %qs already specified in %<@dynamic%>", | |
7766 IDENTIFIER_POINTER (property_name)); | |
7767 else | |
7768 error_at (location, "property %qs already specified in %<@synthesize%>", | |
7769 IDENTIFIER_POINTER (property_name)); | |
7770 | |
7771 if (original_location != UNKNOWN_LOCATION) | |
7772 inform (original_location, "originally specified here"); | |
7773 return; | |
7774 } | |
7775 | |
7776 /* Check that the property is declared in the interface. It could | |
7777 also be declared in a superclass or protocol. */ | |
7778 property = lookup_property (interface, property_name); | |
7779 | |
7780 if (!property) | |
7781 { | |
7782 error_at (location, "no declaration of property %qs found in the interface", | |
7783 IDENTIFIER_POINTER (property_name)); | |
7784 return; | |
7785 } | |
7786 else | |
7787 { | |
7788 /* We have to copy the property, because we want to chain it to | |
7789 the implementation context, and we want to store the source | |
7790 location of the @synthesize, not of the original | |
7791 @property. */ | |
7792 property = copy_node (property); | |
7793 DECL_SOURCE_LOCATION (property) = location; | |
7794 } | |
7795 | |
7796 /* Note that a @dynamic (and only a @dynamic) always sets | |
7797 PROPERTY_DYNAMIC to 1. You can recognize a @dynamic by that. | |
7798 (actually, as explained above, PROPERTY_DECL generated by | |
7799 @property and associated with a @dynamic property are also marked | |
7800 as PROPERTY_DYNAMIC). */ | |
7801 PROPERTY_DYNAMIC (property) = 1; | |
7802 | |
7803 /* Add the property to the list of properties for current implementation. */ | |
7804 TREE_CHAIN (property) = IMPL_PROPERTY_DECL (objc_implementation_context); | |
7805 IMPL_PROPERTY_DECL (objc_implementation_context) = property; | |
7806 } | |
7807 | |
7808 /* This function is called by the parser after a @dynamic expression | |
7809 is parsed. 'location' is the location of the @dynamic expression, | |
7810 and 'property_list' is a chained list of all the property | |
7811 names. */ | |
7812 void | |
7813 objc_add_dynamic_declaration (location_t location, tree property_list) | |
7814 { | |
7815 tree interface, chain; | |
7816 | |
7817 if (flag_objc1_only) | |
7818 error_at (input_location, "%<@dynamic%> is not available in Objective-C 1.0"); | |
7819 | |
7820 if (property_list == error_mark_node) | |
7821 return; | |
7822 | |
7823 if (!objc_implementation_context) | |
7824 { | |
7825 /* We can get here only in Objective-C; the Objective-C++ parser | |
7826 detects the problem while parsing, outputs the error | |
7827 "misplaced '@dynamic' Objective-C++ construct" and skips the | |
7828 declaration. */ | |
7829 error_at (location, "%<@dynamic%> not in @implementation context"); | |
7830 return; | |
7831 } | |
7832 | |
7833 /* @dynamic is allowed in categories. */ | |
7834 switch (TREE_CODE (objc_implementation_context)) | |
7835 { | |
7836 case CLASS_IMPLEMENTATION_TYPE: | |
7837 interface = lookup_interface (CLASS_NAME (objc_implementation_context)); | |
7838 break; | |
7839 case CATEGORY_IMPLEMENTATION_TYPE: | |
7840 interface = lookup_category (implementation_template, | |
7841 CLASS_SUPER_NAME (objc_implementation_context)); | |
7842 break; | |
7843 default: | |
7844 gcc_unreachable (); | |
7845 } | |
7846 | |
7847 if (!interface) | |
7848 { | |
7849 /* I can't see how this could happen, but it is good as a safety check. */ | |
7850 error_at (location, | |
7851 "%<@dynamic%> requires the @interface of the class to be available"); | |
7852 return; | |
7853 } | |
7854 | |
7855 /* Now, iterate over the properties and do each of them. */ | |
7856 for (chain = property_list; chain; chain = TREE_CHAIN (chain)) | |
7857 { | |
7858 objc_add_dynamic_declaration_for_property (location, interface, TREE_VALUE (chain)); | |
7859 } | |
7860 } | |
7861 | |
7862 /* Main routine to generate code/data for all the property information for | |
7863 current implementation (class or category). CLASS is the interface where | |
7864 ivars are declared. CLASS_METHODS is where methods are found which | |
7865 could be a class or a category depending on whether we are implementing | |
7866 property of a class or a category. */ | |
7867 | |
7868 static void | |
7869 objc_gen_property_data (tree klass, tree class_methods) | |
7870 { | |
7871 tree x; | |
7872 | |
7873 for (x = IMPL_PROPERTY_DECL (objc_implementation_context); x; x = TREE_CHAIN (x)) | |
7874 { | |
7875 /* @dynamic property - nothing to check or synthesize. */ | |
7876 if (PROPERTY_DYNAMIC (x)) | |
7877 continue; | |
7878 | |
7879 /* @synthesize property - need to synthesize the accessors. */ | |
7880 if (PROPERTY_IVAR_NAME (x)) | |
7881 { | |
7882 objc_synthesize_getter (klass, class_methods, x); | |
7883 | |
7884 if (PROPERTY_READONLY (x) == 0) | |
7885 objc_synthesize_setter (klass, class_methods, x); | |
7886 | |
7887 continue; | |
7888 } | |
7889 | |
7890 gcc_unreachable (); | |
7891 } | |
7892 } | |
7893 | |
7894 /* This is called once we see the "@end" in an interface/implementation. */ | |
7895 | |
7896 static void | |
7897 finish_class (tree klass) | |
7898 { | |
7899 switch (TREE_CODE (klass)) | |
7900 { | |
7901 case CLASS_IMPLEMENTATION_TYPE: | |
7902 { | |
7903 /* All metadata generation is done in runtime.generate_metadata(). */ | |
7904 | |
7905 /* Generate what needed for property; setters, getters, etc. */ | |
7906 objc_gen_property_data (implementation_template, implementation_template); | |
7907 | |
7908 if (implementation_template != objc_implementation_context) | |
7909 { | |
7910 /* Ensure that all method listed in the interface contain bodies. */ | |
7911 check_methods (CLASS_CLS_METHODS (implementation_template), | |
7912 objc_implementation_context, '+'); | |
7913 check_methods (CLASS_NST_METHODS (implementation_template), | |
7914 objc_implementation_context, '-'); | |
7915 | |
7916 if (CLASS_PROTOCOL_LIST (implementation_template)) | |
7917 check_protocols (CLASS_PROTOCOL_LIST (implementation_template), | |
7918 "class", | |
7919 CLASS_NAME (objc_implementation_context)); | |
7920 } | |
7921 break; | |
7922 } | |
7923 case CATEGORY_IMPLEMENTATION_TYPE: | |
7924 { | |
7925 tree category = lookup_category (implementation_template, CLASS_SUPER_NAME (klass)); | |
7926 | |
7927 if (category) | |
7928 { | |
7929 /* Generate what needed for property; setters, getters, etc. */ | |
7930 objc_gen_property_data (implementation_template, category); | |
7931 | |
7932 /* Ensure all method listed in the interface contain bodies. */ | |
7933 check_methods (CLASS_CLS_METHODS (category), | |
7934 objc_implementation_context, '+'); | |
7935 check_methods (CLASS_NST_METHODS (category), | |
7936 objc_implementation_context, '-'); | |
7937 | |
7938 if (CLASS_PROTOCOL_LIST (category)) | |
7939 check_protocols (CLASS_PROTOCOL_LIST (category), | |
7940 "category", | |
7941 CLASS_SUPER_NAME (objc_implementation_context)); | |
7942 } | |
7943 break; | |
7944 } | |
7945 case CLASS_INTERFACE_TYPE: | |
7946 case CATEGORY_INTERFACE_TYPE: | |
7947 case PROTOCOL_INTERFACE_TYPE: | |
7948 { | |
7949 /* Process properties of the class. */ | |
7950 tree x; | |
7951 for (x = CLASS_PROPERTY_DECL (objc_interface_context); x; x = TREE_CHAIN (x)) | |
7952 { | |
7953 /* Now we check that the appropriate getter is declared, | |
7954 and if not, we declare one ourselves. */ | |
7955 tree getter_decl = lookup_method (CLASS_NST_METHODS (klass), | |
7956 PROPERTY_GETTER_NAME (x)); | |
7957 | |
7958 if (getter_decl) | |
7959 { | |
7960 /* TODO: Check that the declaration is consistent with the property. */ | |
7961 ; | |
7962 } | |
7963 else | |
7964 { | |
7965 /* Generate an instance method declaration for the | |
7966 getter; for example "- (id) name;". In general it | |
7967 will be of the form | |
7968 -(type)property_getter_name; */ | |
7969 tree rettype = build_tree_list (NULL_TREE, TREE_TYPE (x)); | |
7970 getter_decl = build_method_decl (INSTANCE_METHOD_DECL, | |
7971 rettype, PROPERTY_GETTER_NAME (x), | |
7972 NULL_TREE, false); | |
7973 if (PROPERTY_OPTIONAL (x)) | |
7974 objc_add_method (objc_interface_context, getter_decl, false, true); | |
7975 else | |
7976 objc_add_method (objc_interface_context, getter_decl, false, false); | |
7977 TREE_DEPRECATED (getter_decl) = TREE_DEPRECATED (x); | |
7978 METHOD_PROPERTY_CONTEXT (getter_decl) = x; | |
7979 } | |
7980 | |
7981 if (PROPERTY_READONLY (x) == 0) | |
7982 { | |
7983 /* Now we check that the appropriate setter is declared, | |
7984 and if not, we declare on ourselves. */ | |
7985 tree setter_decl = lookup_method (CLASS_NST_METHODS (klass), | |
7986 PROPERTY_SETTER_NAME (x)); | |
7987 | |
7988 if (setter_decl) | |
7989 { | |
7990 /* TODO: Check that the declaration is consistent with the property. */ | |
7991 ; | |
7992 } | |
7993 else | |
7994 { | |
7995 /* The setter name is something like 'setName:'. | |
7996 We need the substring 'setName' to build the | |
7997 method declaration due to how the declaration | |
7998 works. TODO: build_method_decl() will then | |
7999 generate back 'setName:' from 'setName'; it | |
8000 would be more efficient to hook into there. */ | |
8001 const char *full_setter_name = IDENTIFIER_POINTER (PROPERTY_SETTER_NAME (x)); | |
8002 size_t length = strlen (full_setter_name); | |
8003 char *setter_name = (char *) alloca (length); | |
8004 tree ret_type, selector, arg_type, arg_name; | |
8005 | |
8006 strcpy (setter_name, full_setter_name); | |
8007 setter_name[length - 1] = '\0'; | |
8008 ret_type = build_tree_list (NULL_TREE, void_type_node); | |
8009 arg_type = build_tree_list (NULL_TREE, TREE_TYPE (x)); | |
8010 arg_name = get_identifier ("_value"); | |
8011 selector = objc_build_keyword_decl (get_identifier (setter_name), | |
8012 arg_type, arg_name, NULL); | |
8013 setter_decl = build_method_decl (INSTANCE_METHOD_DECL, | |
8014 ret_type, selector, | |
8015 build_tree_list (NULL_TREE, NULL_TREE), | |
8016 false); | |
8017 if (PROPERTY_OPTIONAL (x)) | |
8018 objc_add_method (objc_interface_context, setter_decl, false, true); | |
8019 else | |
8020 objc_add_method (objc_interface_context, setter_decl, false, false); | |
8021 TREE_DEPRECATED (setter_decl) = TREE_DEPRECATED (x); | |
8022 METHOD_PROPERTY_CONTEXT (setter_decl) = x; | |
8023 } | |
8024 } | |
8025 } | |
8026 break; | |
8027 } | |
8028 default: | |
8029 gcc_unreachable (); | |
8030 break; | |
8031 } | |
8032 } | |
8033 | |
8034 static tree | |
8035 add_protocol (tree protocol) | |
8036 { | |
8037 /* Put protocol on list in reverse order. */ | |
8038 TREE_CHAIN (protocol) = protocol_chain; | |
8039 protocol_chain = protocol; | |
8040 return protocol_chain; | |
8041 } | |
8042 | |
8043 /* Check that a protocol is defined, and, recursively, that all | |
8044 protocols that this protocol conforms to are defined too. */ | |
8045 static void | |
8046 check_that_protocol_is_defined (tree protocol) | |
8047 { | |
8048 if (!PROTOCOL_DEFINED (protocol)) | |
8049 warning (0, "definition of protocol %qE not found", | |
8050 PROTOCOL_NAME (protocol)); | |
8051 | |
8052 /* If the protocol itself conforms to other protocols, check them | |
8053 too, recursively. */ | |
8054 if (PROTOCOL_LIST (protocol)) | |
8055 { | |
8056 tree p; | |
8057 | |
8058 for (p = PROTOCOL_LIST (protocol); p; p = TREE_CHAIN (p)) | |
8059 check_that_protocol_is_defined (TREE_VALUE (p)); | |
8060 } | |
8061 } | |
8062 | |
8063 /* Looks up a protocol. If 'warn_if_deprecated' is true, a warning is | |
8064 emitted if the protocol is deprecated. If 'definition_required' is | |
8065 true, a warning is emitted if a full @protocol definition has not | |
8066 been seen. */ | |
8067 static tree | |
8068 lookup_protocol (tree ident, bool warn_if_deprecated, bool definition_required) | |
8069 { | |
8070 tree chain; | |
8071 | |
8072 for (chain = protocol_chain; chain; chain = TREE_CHAIN (chain)) | |
8073 if (ident == PROTOCOL_NAME (chain)) | |
8074 { | |
8075 if (warn_if_deprecated && TREE_DEPRECATED (chain)) | |
8076 { | |
8077 /* It would be nice to use warn_deprecated_use() here, but | |
8078 we are using TREE_CHAIN (which is supposed to be the | |
8079 TYPE_STUB_DECL for a TYPE) for something different. */ | |
8080 warning (OPT_Wdeprecated_declarations, "protocol %qE is deprecated", | |
8081 PROTOCOL_NAME (chain)); | |
8082 } | |
8083 | |
8084 if (definition_required) | |
8085 check_that_protocol_is_defined (chain); | |
8086 | |
8087 return chain; | |
8088 } | |
8089 | |
8090 return NULL_TREE; | |
8091 } | |
8092 | |
8093 /* This function forward declares the protocols named by NAMES. If | |
8094 they are already declared or defined, the function has no effect. */ | |
8095 | |
8096 void | |
8097 objc_declare_protocol (tree name, tree attributes) | |
8098 { | |
8099 bool deprecated = false; | |
8100 | |
8101 #ifdef OBJCPLUS | |
8102 if (current_namespace != global_namespace) { | |
8103 error ("Objective-C declarations may only appear in global scope"); | |
8104 } | |
8105 #endif /* OBJCPLUS */ | |
8106 | |
8107 /* Determine if 'deprecated', the only attribute we recognize for | |
8108 protocols, was used. Ignore all other attributes. */ | |
8109 if (attributes) | |
8110 { | |
8111 tree attribute; | |
8112 for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) | |
8113 { | |
8114 tree name = TREE_PURPOSE (attribute); | |
8115 | |
8116 if (is_attribute_p ("deprecated", name)) | |
8117 deprecated = true; | |
8118 else | |
8119 warning (OPT_Wattributes, "%qE attribute directive ignored", name); | |
8120 } | |
8121 } | |
8122 | |
8123 if (lookup_protocol (name, /* warn if deprecated */ false, | |
8124 /* definition_required */ false) == NULL_TREE) | |
8125 { | |
8126 tree protocol = make_node (PROTOCOL_INTERFACE_TYPE); | |
8127 | |
8128 TYPE_LANG_SLOT_1 (protocol) | |
8129 = make_tree_vec (PROTOCOL_LANG_SLOT_ELTS); | |
8130 PROTOCOL_NAME (protocol) = name; | |
8131 PROTOCOL_LIST (protocol) = NULL_TREE; | |
8132 add_protocol (protocol); | |
8133 PROTOCOL_DEFINED (protocol) = 0; | |
8134 PROTOCOL_FORWARD_DECL (protocol) = NULL_TREE; | |
8135 | |
8136 if (attributes) | |
8137 { | |
8138 /* TODO: Do we need to store the attributes here ? */ | |
8139 TYPE_ATTRIBUTES (protocol) = attributes; | |
8140 if (deprecated) | |
8141 TREE_DEPRECATED (protocol) = 1; | |
8142 } | |
8143 } | |
8144 } | |
8145 | |
8146 static tree | |
8147 start_protocol (enum tree_code code, tree name, tree list, tree attributes) | |
8148 { | |
8149 tree protocol; | |
8150 bool deprecated = false; | |
8151 | |
8152 #ifdef OBJCPLUS | |
8153 if (current_namespace != global_namespace) { | |
8154 error ("Objective-C declarations may only appear in global scope"); | |
8155 } | |
8156 #endif /* OBJCPLUS */ | |
8157 | |
8158 /* Determine if 'deprecated', the only attribute we recognize for | |
8159 protocols, was used. Ignore all other attributes. */ | |
8160 if (attributes) | |
8161 { | |
8162 tree attribute; | |
8163 for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) | |
8164 { | |
8165 tree name = TREE_PURPOSE (attribute); | |
8166 | |
8167 if (is_attribute_p ("deprecated", name)) | |
8168 deprecated = true; | |
8169 else | |
8170 warning (OPT_Wattributes, "%qE attribute directive ignored", name); | |
8171 } | |
8172 } | |
8173 | |
8174 protocol = lookup_protocol (name, /* warn_if_deprecated */ false, | |
8175 /* definition_required */ false); | |
8176 | |
8177 if (!protocol) | |
8178 { | |
8179 protocol = make_node (code); | |
8180 TYPE_LANG_SLOT_1 (protocol) = make_tree_vec (PROTOCOL_LANG_SLOT_ELTS); | |
8181 | |
8182 PROTOCOL_NAME (protocol) = name; | |
8183 PROTOCOL_LIST (protocol) = lookup_and_install_protocols (list, /* definition_required */ false); | |
8184 add_protocol (protocol); | |
8185 PROTOCOL_DEFINED (protocol) = 1; | |
8186 PROTOCOL_FORWARD_DECL (protocol) = NULL_TREE; | |
8187 | |
8188 check_protocol_recursively (protocol, list); | |
8189 } | |
8190 else if (! PROTOCOL_DEFINED (protocol)) | |
8191 { | |
8192 PROTOCOL_DEFINED (protocol) = 1; | |
8193 PROTOCOL_LIST (protocol) = lookup_and_install_protocols (list, /* definition_required */ false); | |
8194 | |
8195 check_protocol_recursively (protocol, list); | |
8196 } | |
8197 else | |
8198 { | |
8199 warning (0, "duplicate declaration for protocol %qE", | |
8200 name); | |
8201 } | |
8202 | |
8203 if (attributes) | |
8204 { | |
8205 TYPE_ATTRIBUTES (protocol) = attributes; | |
8206 if (deprecated) | |
8207 TREE_DEPRECATED (protocol) = 1; | |
8208 } | |
8209 | |
8210 return protocol; | |
8211 } | |
8212 | |
8213 /* Decay array and function parameters into pointers. */ | |
8214 | |
8215 static tree | |
8216 objc_decay_parm_type (tree type) | |
8217 { | |
8218 if (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == FUNCTION_TYPE) | |
8219 type = build_pointer_type (TREE_CODE (type) == ARRAY_TYPE | |
8220 ? TREE_TYPE (type) | |
8221 : type); | |
8222 | |
8223 return type; | |
8224 } | |
8225 | |
8226 static GTY(()) tree objc_parmlist = NULL_TREE; | |
8227 | |
8228 /* Append PARM to a list of formal parameters of a method, making a necessary | |
8229 array-to-pointer adjustment along the way. */ | |
8230 | |
8231 void | |
8232 objc_push_parm (tree parm) | |
8233 { | |
8234 tree type; | |
8235 | |
8236 if (TREE_TYPE (parm) == error_mark_node) | |
8237 { | |
8238 objc_parmlist = chainon (objc_parmlist, parm); | |
8239 return; | |
8240 } | |
8241 | |
8242 /* Decay arrays and functions into pointers. */ | |
8243 type = objc_decay_parm_type (TREE_TYPE (parm)); | |
8244 | |
8245 /* If the parameter type has been decayed, a new PARM_DECL needs to be | |
8246 built as well. */ | |
8247 if (type != TREE_TYPE (parm)) | |
8248 parm = build_decl (input_location, PARM_DECL, DECL_NAME (parm), type); | |
8249 | |
8250 DECL_ARG_TYPE (parm) | |
8251 = lang_hooks.types.type_promotes_to (TREE_TYPE (parm)); | |
8252 | |
8253 /* Record constancy and volatility. */ | |
8254 c_apply_type_quals_to_decl | |
8255 ((TYPE_READONLY (TREE_TYPE (parm)) ? TYPE_QUAL_CONST : 0) | |
8256 | (TYPE_RESTRICT (TREE_TYPE (parm)) ? TYPE_QUAL_RESTRICT : 0) | |
8257 | (TYPE_ATOMIC (TREE_TYPE (parm)) ? TYPE_QUAL_ATOMIC : 0) | |
8258 | (TYPE_VOLATILE (TREE_TYPE (parm)) ? TYPE_QUAL_VOLATILE : 0), parm); | |
8259 | |
8260 objc_parmlist = chainon (objc_parmlist, parm); | |
8261 } | |
8262 | |
8263 /* Retrieve the formal parameter list constructed via preceding calls to | |
8264 objc_push_parm(). */ | |
8265 | |
8266 #ifdef OBJCPLUS | |
8267 tree | |
8268 objc_get_parm_info (int have_ellipsis ATTRIBUTE_UNUSED, | |
8269 tree expr ATTRIBUTE_UNUSED) | |
8270 { | |
8271 tree parm_info = objc_parmlist; | |
8272 objc_parmlist = NULL_TREE; | |
8273 | |
8274 return parm_info; | |
8275 } | |
8276 #else | |
8277 struct c_arg_info * | |
8278 objc_get_parm_info (int have_ellipsis, tree expr) | |
8279 { | |
8280 tree parm_info = objc_parmlist; | |
8281 struct c_arg_info *arg_info; | |
8282 /* The C front-end requires an elaborate song and dance at | |
8283 this point. */ | |
8284 push_scope (); | |
8285 declare_parm_level (); | |
8286 while (parm_info) | |
8287 { | |
8288 tree next = DECL_CHAIN (parm_info); | |
8289 | |
8290 DECL_CHAIN (parm_info) = NULL_TREE; | |
8291 parm_info = pushdecl (parm_info); | |
8292 finish_decl (parm_info, input_location, NULL_TREE, NULL_TREE, NULL_TREE); | |
8293 parm_info = next; | |
8294 } | |
8295 arg_info = get_parm_info (have_ellipsis, expr); | |
8296 pop_scope (); | |
8297 objc_parmlist = NULL_TREE; | |
8298 return arg_info; | |
8299 } | |
8300 #endif | |
8301 | |
8302 /* Synthesize the formal parameters 'id self' and 'SEL _cmd' needed for ObjC | |
8303 method definitions. In the case of instance methods, we can be more | |
8304 specific as to the type of 'self'. */ | |
8305 | |
8306 static void | |
8307 synth_self_and_ucmd_args (void) | |
8308 { | |
8309 tree self_type; | |
8310 | |
8311 if (objc_method_context | |
8312 && TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL) | |
8313 self_type = objc_instance_type; | |
8314 else | |
8315 /* Really a `struct objc_class *'. However, we allow people to | |
8316 assign to self, which changes its type midstream. */ | |
8317 self_type = objc_object_type; | |
8318 | |
8319 /* id self; */ | |
8320 objc_push_parm (build_decl (input_location, | |
8321 PARM_DECL, self_id, self_type)); | |
8322 | |
8323 /* SEL _cmd; */ | |
8324 objc_push_parm (build_decl (input_location, | |
8325 PARM_DECL, ucmd_id, objc_selector_type)); | |
8326 } | |
8327 | |
8328 /* Transform an Objective-C method definition into a static C function | |
8329 definition, synthesizing the first two arguments, "self" and "_cmd", | |
8330 in the process. EXPR is NULL or an expression that needs to be | |
8331 evaluated for the side effects of array size expressions in the | |
8332 parameters. */ | |
8333 | |
8334 static void | |
8335 start_method_def (tree method, tree expr) | |
8336 { | |
8337 tree parmlist; | |
8338 #ifdef OBJCPLUS | |
8339 tree parm_info; | |
8340 #else | |
8341 struct c_arg_info *parm_info; | |
8342 #endif | |
8343 int have_ellipsis = 0; | |
8344 | |
8345 /* If we are defining a "dealloc" method in a non-root class, we | |
8346 will need to check if a [super dealloc] is missing, and warn if | |
8347 it is. */ | |
8348 if(CLASS_SUPER_NAME (objc_implementation_context) | |
8349 && !strcmp ("dealloc", IDENTIFIER_POINTER (METHOD_SEL_NAME (method)))) | |
8350 should_call_super_dealloc = 1; | |
8351 else | |
8352 should_call_super_dealloc = 0; | |
8353 | |
8354 /* Required to implement _msgSuper. */ | |
8355 objc_method_context = method; | |
8356 UOBJC_SUPER_decl = NULL_TREE; | |
8357 | |
8358 /* Generate prototype declarations for arguments..."new-style". */ | |
8359 synth_self_and_ucmd_args (); | |
8360 | |
8361 /* Generate argument declarations if a keyword_decl. */ | |
8362 parmlist = METHOD_SEL_ARGS (method); | |
8363 while (parmlist) | |
8364 { | |
8365 /* parmlist is a KEYWORD_DECL. */ | |
8366 tree type = TREE_VALUE (TREE_TYPE (parmlist)); | |
8367 tree parm; | |
8368 | |
8369 parm = build_decl (input_location, | |
8370 PARM_DECL, KEYWORD_ARG_NAME (parmlist), type); | |
8371 decl_attributes (&parm, DECL_ATTRIBUTES (parmlist), 0); | |
8372 objc_push_parm (parm); | |
8373 parmlist = DECL_CHAIN (parmlist); | |
8374 } | |
8375 | |
8376 if (METHOD_ADD_ARGS (method)) | |
8377 { | |
8378 tree akey; | |
8379 | |
8380 for (akey = TREE_CHAIN (METHOD_ADD_ARGS (method)); | |
8381 akey; akey = TREE_CHAIN (akey)) | |
8382 { | |
8383 objc_push_parm (TREE_VALUE (akey)); | |
8384 } | |
8385 | |
8386 if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) | |
8387 have_ellipsis = 1; | |
8388 } | |
8389 | |
8390 parm_info = objc_get_parm_info (have_ellipsis, expr); | |
8391 | |
8392 really_start_method (objc_method_context, parm_info); | |
8393 } | |
8394 | |
8395 /* Return 1 if TYPE1 is equivalent to TYPE2 for purposes of method | |
8396 overloading. */ | |
8397 static int | |
8398 objc_types_are_equivalent (tree type1, tree type2) | |
8399 { | |
8400 if (type1 == type2) | |
8401 return 1; | |
8402 | |
8403 /* Strip away indirections. */ | |
8404 while ((TREE_CODE (type1) == ARRAY_TYPE || TREE_CODE (type1) == POINTER_TYPE) | |
8405 && (TREE_CODE (type1) == TREE_CODE (type2))) | |
8406 type1 = TREE_TYPE (type1), type2 = TREE_TYPE (type2); | |
8407 if (TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2)) | |
8408 return 0; | |
8409 | |
8410 /* Compare the protocol lists. */ | |
8411 type1 = (TYPE_HAS_OBJC_INFO (type1) | |
8412 ? TYPE_OBJC_PROTOCOL_LIST (type1) | |
8413 : NULL_TREE); | |
8414 type2 = (TYPE_HAS_OBJC_INFO (type2) | |
8415 ? TYPE_OBJC_PROTOCOL_LIST (type2) | |
8416 : NULL_TREE); | |
8417 | |
8418 /* If there are no protocols (most common case), the types are | |
8419 identical. */ | |
8420 if (type1 == NULL_TREE && type2 == NULL_TREE) | |
8421 return 1; | |
8422 | |
8423 /* If one has protocols, and the other one hasn't, they are not | |
8424 identical. */ | |
8425 if ((type1 == NULL_TREE && type2 != NULL_TREE) | |
8426 || (type1 != NULL_TREE && type2 == NULL_TREE)) | |
8427 return 0; | |
8428 else | |
8429 { | |
8430 /* Else, both have protocols, and we need to do the full | |
8431 comparison. It is possible that either type1 or type2 | |
8432 contain some duplicate protocols in the list, so we can't | |
8433 even just compare list_length as a first check. */ | |
8434 tree t; | |
8435 | |
8436 for (t = type2; t; t = TREE_CHAIN (t)) | |
8437 if (!lookup_protocol_in_reflist (type1, TREE_VALUE (t))) | |
8438 return 0; | |
8439 | |
8440 for (t = type1; t; t = TREE_CHAIN (t)) | |
8441 if (!lookup_protocol_in_reflist (type2, TREE_VALUE (t))) | |
8442 return 0; | |
8443 | |
8444 return 1; | |
8445 } | |
8446 } | |
8447 | |
8448 /* Return 1 if TYPE1 has the same size and alignment as TYPE2. */ | |
8449 | |
8450 static int | |
8451 objc_types_share_size_and_alignment (tree type1, tree type2) | |
8452 { | |
8453 return (simple_cst_equal (TYPE_SIZE (type1), TYPE_SIZE (type2)) | |
8454 && TYPE_ALIGN (type1) == TYPE_ALIGN (type2)); | |
8455 } | |
8456 | |
8457 /* Return 1 if PROTO1 is equivalent to PROTO2 | |
8458 for purposes of method overloading. Ordinarily, the type signatures | |
8459 should match up exactly, unless STRICT is zero, in which case we | |
8460 shall allow differences in which the size and alignment of a type | |
8461 is the same. */ | |
8462 | |
8463 static int | |
8464 comp_proto_with_proto (tree proto1, tree proto2, int strict) | |
8465 { | |
8466 tree type1, type2; | |
8467 | |
8468 /* The following test is needed in case there are hashing | |
8469 collisions. */ | |
8470 if (METHOD_SEL_NAME (proto1) != METHOD_SEL_NAME (proto2)) | |
8471 return 0; | |
8472 | |
8473 /* Compare return types. */ | |
8474 type1 = TREE_VALUE (TREE_TYPE (proto1)); | |
8475 type2 = TREE_VALUE (TREE_TYPE (proto2)); | |
8476 | |
8477 if (!objc_types_are_equivalent (type1, type2) | |
8478 && (strict || !objc_types_share_size_and_alignment (type1, type2))) | |
8479 return 0; | |
8480 | |
8481 /* Compare argument types. */ | |
8482 | |
8483 /* The first argument (objc_object_type) is always the same, no need | |
8484 to compare. */ | |
8485 | |
8486 /* The second argument (objc_selector_type) is always the same, no | |
8487 need to compare. */ | |
8488 | |
8489 /* Compare the other arguments. */ | |
8490 { | |
8491 tree arg1, arg2; | |
8492 | |
8493 /* Compare METHOD_SEL_ARGS. */ | |
8494 for (arg1 = METHOD_SEL_ARGS (proto1), arg2 = METHOD_SEL_ARGS (proto2); | |
8495 arg1 && arg2; | |
8496 arg1 = DECL_CHAIN (arg1), arg2 = DECL_CHAIN (arg2)) | |
8497 { | |
8498 type1 = TREE_VALUE (TREE_TYPE (arg1)); | |
8499 type2 = TREE_VALUE (TREE_TYPE (arg2)); | |
8500 | |
8501 /* FIXME: Do we need to decay argument types to compare them ? */ | |
8502 type1 = objc_decay_parm_type (type1); | |
8503 type2 = objc_decay_parm_type (type2); | |
8504 | |
8505 if (!objc_types_are_equivalent (type1, type2) | |
8506 && (strict || !objc_types_share_size_and_alignment (type1, type2))) | |
8507 return 0; | |
8508 } | |
8509 | |
8510 /* The loop ends when arg1 or arg2 are NULL. Make sure they are | |
8511 both NULL. */ | |
8512 if (arg1 != arg2) | |
8513 return 0; | |
8514 | |
8515 /* Compare METHOD_ADD_ARGS. */ | |
8516 if ((METHOD_ADD_ARGS (proto1) && !METHOD_ADD_ARGS (proto2)) | |
8517 || (METHOD_ADD_ARGS (proto2) && !METHOD_ADD_ARGS (proto1))) | |
8518 return 0; | |
8519 | |
8520 if (METHOD_ADD_ARGS (proto1)) | |
8521 { | |
8522 for (arg1 = TREE_CHAIN (METHOD_ADD_ARGS (proto1)), arg2 = TREE_CHAIN (METHOD_ADD_ARGS (proto2)); | |
8523 arg1 && arg2; | |
8524 arg1 = TREE_CHAIN (arg1), arg2 = TREE_CHAIN (arg2)) | |
8525 { | |
8526 type1 = TREE_TYPE (TREE_VALUE (arg1)); | |
8527 type2 = TREE_TYPE (TREE_VALUE (arg2)); | |
8528 | |
8529 /* FIXME: Do we need to decay argument types to compare them ? */ | |
8530 type1 = objc_decay_parm_type (type1); | |
8531 type2 = objc_decay_parm_type (type2); | |
8532 | |
8533 if (!objc_types_are_equivalent (type1, type2) | |
8534 && (strict || !objc_types_share_size_and_alignment (type1, type2))) | |
8535 return 0; | |
8536 } | |
8537 } | |
8538 | |
8539 /* The loop ends when arg1 or arg2 are NULL. Make sure they are | |
8540 both NULL. */ | |
8541 if (arg1 != arg2) | |
8542 return 0; | |
8543 | |
8544 /* Compare METHOD_ADD_ARGS_ELLIPSIS_P. */ | |
8545 if (METHOD_ADD_ARGS_ELLIPSIS_P (proto1) != METHOD_ADD_ARGS_ELLIPSIS_P (proto2)) | |
8546 return 0; | |
8547 } | |
8548 | |
8549 /* Success. */ | |
8550 return 1; | |
8551 } | |
8552 | |
8553 /* This routine returns true if TYPE is a valid objc object type, | |
8554 suitable for messaging; false otherwise. If 'accept_class' is | |
8555 'true', then a Class object is considered valid for messaging and | |
8556 'true' is returned if 'type' refers to a Class. If 'accept_class' | |
8557 is 'false', then a Class object is not considered valid for | |
8558 messaging and 'false' is returned in that case. */ | |
8559 | |
8560 static bool | |
8561 objc_type_valid_for_messaging (tree type, bool accept_classes) | |
8562 { | |
8563 if (!POINTER_TYPE_P (type)) | |
8564 return false; | |
8565 | |
8566 /* Remove the pointer indirection; don't remove more than one | |
8567 otherwise we'd consider "NSObject **" a valid type for messaging, | |
8568 which it isn't. */ | |
8569 type = TREE_TYPE (type); | |
8570 | |
8571 if (TREE_CODE (type) != RECORD_TYPE) | |
8572 return false; | |
8573 | |
8574 if (objc_is_object_id (type)) | |
8575 return true; | |
8576 | |
8577 if (objc_is_class_id (type)) | |
8578 return accept_classes; | |
8579 | |
8580 if (TYPE_HAS_OBJC_INFO (type)) | |
8581 return true; | |
8582 | |
8583 return false; | |
8584 } | |
8585 | |
8586 void | |
8587 objc_start_function (tree name, tree type, tree attrs, | |
8588 #ifdef OBJCPLUS | |
8589 tree params | |
8590 #else | |
8591 struct c_arg_info *params | |
8592 #endif | |
8593 ) | |
8594 { | |
8595 tree fndecl = build_decl (input_location, | |
8596 FUNCTION_DECL, name, type); | |
8597 | |
8598 #ifdef OBJCPLUS | |
8599 DECL_ARGUMENTS (fndecl) = params; | |
8600 DECL_INITIAL (fndecl) = error_mark_node; | |
8601 DECL_EXTERNAL (fndecl) = 0; | |
8602 TREE_STATIC (fndecl) = 1; | |
8603 retrofit_lang_decl (fndecl); | |
8604 cplus_decl_attributes (&fndecl, attrs, 0); | |
8605 start_preparsed_function (fndecl, attrs, /*flags=*/SF_DEFAULT); | |
8606 #else | |
8607 current_function_returns_value = 0; /* Assume, until we see it does. */ | |
8608 current_function_returns_null = 0; | |
8609 decl_attributes (&fndecl, attrs, 0); | |
8610 announce_function (fndecl); | |
8611 DECL_INITIAL (fndecl) = error_mark_node; | |
8612 DECL_EXTERNAL (fndecl) = 0; | |
8613 TREE_STATIC (fndecl) = 1; | |
8614 current_function_decl = pushdecl (fndecl); | |
8615 push_scope (); | |
8616 declare_parm_level (); | |
8617 DECL_RESULT (current_function_decl) | |
8618 = build_decl (input_location, | |
8619 RESULT_DECL, NULL_TREE, | |
8620 TREE_TYPE (TREE_TYPE (current_function_decl))); | |
8621 DECL_ARTIFICIAL (DECL_RESULT (current_function_decl)) = 1; | |
8622 DECL_IGNORED_P (DECL_RESULT (current_function_decl)) = 1; | |
8623 start_fname_decls (); | |
8624 store_parm_decls_from (params); | |
8625 #endif | |
8626 | |
8627 TREE_USED (current_function_decl) = 1; | |
8628 } | |
8629 | |
8630 /* - Generate an identifier for the function. the format is "_n_cls", | |
8631 where 1 <= n <= nMethods, and cls is the name the implementation we | |
8632 are processing. | |
8633 - Install the return type from the method declaration. | |
8634 - If we have a prototype, check for type consistency. */ | |
8635 | |
8636 static void | |
8637 really_start_method (tree method, | |
8638 #ifdef OBJCPLUS | |
8639 tree parmlist | |
8640 #else | |
8641 struct c_arg_info *parmlist | |
8642 #endif | |
8643 ) | |
8644 { | |
8645 tree ret_type, meth_type; | |
8646 tree method_id; | |
8647 const char *sel_name, *class_name, *cat_name; | |
8648 char *buf; | |
8649 | |
8650 /* Synth the storage class & assemble the return type. */ | |
8651 ret_type = TREE_VALUE (TREE_TYPE (method)); | |
8652 | |
8653 sel_name = IDENTIFIER_POINTER (METHOD_SEL_NAME (method)); | |
8654 class_name = IDENTIFIER_POINTER (CLASS_NAME (objc_implementation_context)); | |
8655 cat_name = ((TREE_CODE (objc_implementation_context) | |
8656 == CLASS_IMPLEMENTATION_TYPE) | |
8657 ? NULL | |
8658 : IDENTIFIER_POINTER (CLASS_SUPER_NAME (objc_implementation_context))); | |
8659 method_slot++; | |
8660 | |
8661 /* Make sure this is big enough for any plausible method label. */ | |
8662 buf = (char *) alloca (50 + strlen (sel_name) + strlen (class_name) | |
8663 + (cat_name ? strlen (cat_name) : 0)); | |
8664 | |
8665 OBJC_GEN_METHOD_LABEL (buf, TREE_CODE (method) == INSTANCE_METHOD_DECL, | |
8666 class_name, cat_name, sel_name, method_slot); | |
8667 | |
8668 method_id = get_identifier (buf); | |
8669 | |
8670 #ifdef OBJCPLUS | |
8671 /* Objective-C methods cannot be overloaded, so we don't need | |
8672 the type encoding appended. It looks bad anyway... */ | |
8673 push_lang_context (lang_name_c); | |
8674 #endif | |
8675 | |
8676 meth_type = build_function_type_for_method (ret_type, method, METHOD_DEF, 0); | |
8677 objc_start_function (method_id, meth_type, NULL_TREE, parmlist); | |
8678 | |
8679 /* Set self_decl from the first argument. */ | |
8680 self_decl = DECL_ARGUMENTS (current_function_decl); | |
8681 | |
8682 /* Suppress unused warnings. */ | |
8683 TREE_USED (self_decl) = 1; | |
8684 DECL_READ_P (self_decl) = 1; | |
8685 TREE_USED (DECL_CHAIN (self_decl)) = 1; | |
8686 DECL_READ_P (DECL_CHAIN (self_decl)) = 1; | |
8687 #ifdef OBJCPLUS | |
8688 pop_lang_context (); | |
8689 #endif | |
8690 | |
8691 METHOD_DEFINITION (method) = current_function_decl; | |
8692 | |
8693 /* Check consistency...start_function, pushdecl, duplicate_decls. */ | |
8694 | |
8695 if (implementation_template != objc_implementation_context) | |
8696 { | |
8697 tree proto | |
8698 = lookup_method_static (implementation_template, | |
8699 METHOD_SEL_NAME (method), | |
8700 ((TREE_CODE (method) == CLASS_METHOD_DECL) | |
8701 | OBJC_LOOKUP_NO_SUPER)); | |
8702 | |
8703 if (proto) | |
8704 { | |
8705 if (!comp_proto_with_proto (method, proto, 1)) | |
8706 { | |
8707 bool type = TREE_CODE (method) == INSTANCE_METHOD_DECL; | |
8708 | |
8709 warning_at (DECL_SOURCE_LOCATION (method), 0, | |
8710 "conflicting types for %<%c%s%>", | |
8711 (type ? '-' : '+'), | |
8712 identifier_to_locale (gen_method_decl (method))); | |
8713 inform (DECL_SOURCE_LOCATION (proto), | |
8714 "previous declaration of %<%c%s%>", | |
8715 (type ? '-' : '+'), | |
8716 identifier_to_locale (gen_method_decl (proto))); | |
8717 } | |
8718 else | |
8719 { | |
8720 /* If the method in the @interface was deprecated, mark | |
8721 the implemented method as deprecated too. It should | |
8722 never be used for messaging (when the deprecation | |
8723 warnings are produced), but just in case. */ | |
8724 if (TREE_DEPRECATED (proto)) | |
8725 TREE_DEPRECATED (method) = 1; | |
8726 | |
8727 /* If the method in the @interface was marked as | |
8728 'noreturn', mark the function implementing the method | |
8729 as 'noreturn' too. */ | |
8730 TREE_THIS_VOLATILE (current_function_decl) = TREE_THIS_VOLATILE (proto); | |
8731 } | |
8732 } | |
8733 else | |
8734 { | |
8735 /* We have a method @implementation even though we did not | |
8736 see a corresponding @interface declaration (which is allowed | |
8737 by Objective-C rules). Go ahead and place the method in | |
8738 the @interface anyway, so that message dispatch lookups | |
8739 will see it. */ | |
8740 tree interface = implementation_template; | |
8741 | |
8742 if (TREE_CODE (objc_implementation_context) | |
8743 == CATEGORY_IMPLEMENTATION_TYPE) | |
8744 interface = lookup_category | |
8745 (interface, | |
8746 CLASS_SUPER_NAME (objc_implementation_context)); | |
8747 | |
8748 if (interface) | |
8749 objc_add_method (interface, copy_node (method), | |
8750 TREE_CODE (method) == CLASS_METHOD_DECL, | |
8751 /* is_optional= */ false); | |
8752 } | |
8753 } | |
8754 } | |
8755 | |
8756 static void *UOBJC_SUPER_scope = 0; | |
8757 | |
8758 /* _n_Method (id self, SEL sel, ...) | |
8759 { | |
8760 struct objc_super _S; | |
8761 _msgSuper ((_S.self = self, _S.class = _cls, &_S), ...); | |
8762 } */ | |
8763 | |
8764 static tree | |
8765 get_super_receiver (void) | |
8766 { | |
8767 if (objc_method_context) | |
8768 { | |
8769 tree super_expr, super_expr_list, class_expr; | |
8770 bool inst_meth; | |
8771 if (!UOBJC_SUPER_decl) | |
8772 { | |
8773 UOBJC_SUPER_decl = build_decl (input_location, | |
8774 VAR_DECL, get_identifier (TAG_SUPER), | |
8775 objc_super_template); | |
8776 /* This prevents `unused variable' warnings when compiling with -Wall. */ | |
8777 TREE_USED (UOBJC_SUPER_decl) = 1; | |
8778 DECL_READ_P (UOBJC_SUPER_decl) = 1; | |
8779 lang_hooks.decls.pushdecl (UOBJC_SUPER_decl); | |
8780 finish_decl (UOBJC_SUPER_decl, input_location, NULL_TREE, NULL_TREE, | |
8781 NULL_TREE); | |
8782 UOBJC_SUPER_scope = objc_get_current_scope (); | |
8783 } | |
8784 | |
8785 /* Set receiver to self. */ | |
8786 super_expr = objc_build_component_ref (UOBJC_SUPER_decl, self_id); | |
8787 super_expr = build_modify_expr (input_location, super_expr, NULL_TREE, | |
8788 NOP_EXPR, input_location, self_decl, | |
8789 NULL_TREE); | |
8790 super_expr_list = super_expr; | |
8791 | |
8792 /* Set class to begin searching. */ | |
8793 /* Get the ident for the superclass class field & build a ref to it. | |
8794 ??? maybe we should just name the field the same for all runtimes. */ | |
8795 super_expr = (*runtime.super_superclassfield_ident) (); | |
8796 super_expr = objc_build_component_ref (UOBJC_SUPER_decl, super_expr); | |
8797 | |
8798 gcc_assert (imp_list->imp_context == objc_implementation_context | |
8799 && imp_list->imp_template == implementation_template); | |
8800 inst_meth = (TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL); | |
8801 | |
8802 if (TREE_CODE (objc_implementation_context) == CLASS_IMPLEMENTATION_TYPE) | |
8803 class_expr = (*runtime.get_class_super_ref) (input_location, | |
8804 imp_list, inst_meth); | |
8805 else | |
8806 /* We have a category. */ | |
8807 { | |
8808 tree super_name = CLASS_SUPER_NAME (imp_list->imp_template); | |
8809 tree super_class; | |
8810 | |
8811 /* Barf if super used in a category of a root object. */ | |
8812 if (!super_name) | |
8813 { | |
8814 error ("no super class declared in interface for %qE", | |
8815 CLASS_NAME (imp_list->imp_template)); | |
8816 return error_mark_node; | |
8817 } | |
8818 | |
8819 super_class = (*runtime.get_category_super_ref) (input_location, | |
8820 imp_list, inst_meth); | |
8821 class_expr = build_c_cast (input_location, | |
8822 TREE_TYPE (super_expr), super_class); | |
8823 } | |
8824 | |
8825 super_expr = build_modify_expr (input_location, super_expr, NULL_TREE, | |
8826 NOP_EXPR, | |
8827 input_location, class_expr, NULL_TREE); | |
8828 | |
8829 super_expr_list = build_compound_expr (input_location, | |
8830 super_expr_list, super_expr); | |
8831 | |
8832 super_expr = build_unary_op (input_location, | |
8833 ADDR_EXPR, UOBJC_SUPER_decl, 0); | |
8834 super_expr_list = build_compound_expr (input_location, | |
8835 super_expr_list, super_expr); | |
8836 | |
8837 return super_expr_list; | |
8838 } | |
8839 else | |
8840 { | |
8841 error ("[super ...] must appear in a method context"); | |
8842 return error_mark_node; | |
8843 } | |
8844 } | |
8845 | |
8846 /* When exiting a scope, sever links to a 'super' declaration (if any) | |
8847 therein contained. */ | |
8848 | |
8849 void | |
8850 objc_clear_super_receiver (void) | |
8851 { | |
8852 if (objc_method_context | |
8853 && UOBJC_SUPER_scope == objc_get_current_scope ()) | |
8854 { | |
8855 UOBJC_SUPER_decl = 0; | |
8856 UOBJC_SUPER_scope = 0; | |
8857 } | |
8858 } | |
8859 | |
8860 void | |
8861 objc_finish_method_definition (tree fndecl) | |
8862 { | |
8863 /* We cannot validly inline ObjC methods, at least not without a language | |
8864 extension to declare that a method need not be dynamically | |
8865 dispatched, so suppress all thoughts of doing so. */ | |
8866 DECL_UNINLINABLE (fndecl) = 1; | |
8867 | |
8868 #ifndef OBJCPLUS | |
8869 /* The C++ front-end will have called finish_function() for us. */ | |
8870 finish_function (); | |
8871 #endif | |
8872 | |
8873 METHOD_ENCODING (objc_method_context) | |
8874 = encode_method_prototype (objc_method_context); | |
8875 | |
8876 /* Required to implement _msgSuper. This must be done AFTER finish_function, | |
8877 since the optimizer may find "may be used before set" errors. */ | |
8878 objc_method_context = NULL_TREE; | |
8879 | |
8880 if (should_call_super_dealloc) | |
8881 warning (0, "method possibly missing a [super dealloc] call"); | |
8882 } | |
8883 | |
8884 /* Given a tree DECL node, produce a printable description of it in the given | |
8885 buffer, overwriting the buffer. */ | |
8886 | |
8887 static char * | |
8888 gen_declaration (tree decl) | |
8889 { | |
8890 errbuf[0] = '\0'; | |
8891 | |
8892 if (DECL_P (decl)) | |
8893 { | |
8894 gen_type_name_0 (TREE_TYPE (decl)); | |
8895 | |
8896 if (DECL_NAME (decl)) | |
8897 { | |
8898 if (!POINTER_TYPE_P (TREE_TYPE (decl))) | |
8899 strcat (errbuf, " "); | |
8900 | |
8901 strcat (errbuf, IDENTIFIER_POINTER (DECL_NAME (decl))); | |
8902 } | |
8903 | |
8904 #ifdef OBJCPLUS | |
8905 tree w = DECL_BIT_FIELD_REPRESENTATIVE (decl); | |
8906 #else | |
8907 tree w = DECL_INITIAL (decl); | |
8908 #endif | |
8909 if (w && TREE_CODE (w) == INTEGER_CST) | |
8910 sprintf (errbuf + strlen (errbuf), ": " HOST_WIDE_INT_PRINT_DEC, | |
8911 TREE_INT_CST_LOW (w)); | |
8912 } | |
8913 | |
8914 return errbuf; | |
8915 } | |
8916 | |
8917 /* Given a tree TYPE node, produce a printable description of it in the given | |
8918 buffer, overwriting the buffer. */ | |
8919 | |
8920 static char * | |
8921 gen_type_name_0 (tree type) | |
8922 { | |
8923 tree orig = type, proto; | |
8924 | |
8925 if (TYPE_P (type) && TYPE_NAME (type)) | |
8926 type = TYPE_NAME (type); | |
8927 else if (POINTER_TYPE_P (type) || TREE_CODE (type) == ARRAY_TYPE) | |
8928 { | |
8929 tree inner = TREE_TYPE (type); | |
8930 | |
8931 while (TREE_CODE (inner) == ARRAY_TYPE) | |
8932 inner = TREE_TYPE (inner); | |
8933 | |
8934 gen_type_name_0 (inner); | |
8935 | |
8936 if (!POINTER_TYPE_P (inner)) | |
8937 strcat (errbuf, " "); | |
8938 | |
8939 if (POINTER_TYPE_P (type)) | |
8940 strcat (errbuf, "*"); | |
8941 else | |
8942 while (type != inner) | |
8943 { | |
8944 strcat (errbuf, "["); | |
8945 | |
8946 if (TYPE_DOMAIN (type)) | |
8947 { | |
8948 char sz[20]; | |
8949 | |
8950 sprintf (sz, HOST_WIDE_INT_PRINT_DEC, | |
8951 (TREE_INT_CST_LOW | |
8952 (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) + 1)); | |
8953 strcat (errbuf, sz); | |
8954 } | |
8955 | |
8956 strcat (errbuf, "]"); | |
8957 type = TREE_TYPE (type); | |
8958 } | |
8959 | |
8960 goto exit_function; | |
8961 } | |
8962 | |
8963 if (TREE_CODE (type) == TYPE_DECL && DECL_NAME (type)) | |
8964 type = DECL_NAME (type); | |
8965 | |
8966 strcat (errbuf, TREE_CODE (type) == IDENTIFIER_NODE | |
8967 ? IDENTIFIER_POINTER (type) | |
8968 : ""); | |
8969 | |
8970 /* For 'id' and 'Class', adopted protocols are stored in the pointee. */ | |
8971 if (objc_is_id (orig)) | |
8972 orig = TREE_TYPE (orig); | |
8973 | |
8974 proto = TYPE_HAS_OBJC_INFO (orig) ? TYPE_OBJC_PROTOCOL_LIST (orig) : NULL_TREE; | |
8975 | |
8976 if (proto) | |
8977 { | |
8978 strcat (errbuf, " <"); | |
8979 | |
8980 while (proto) { | |
8981 strcat (errbuf, | |
8982 IDENTIFIER_POINTER (PROTOCOL_NAME (TREE_VALUE (proto)))); | |
8983 proto = TREE_CHAIN (proto); | |
8984 strcat (errbuf, proto ? ", " : ">"); | |
8985 } | |
8986 } | |
8987 | |
8988 exit_function: | |
8989 return errbuf; | |
8990 } | |
8991 | |
8992 static char * | |
8993 gen_type_name (tree type) | |
8994 { | |
8995 errbuf[0] = '\0'; | |
8996 | |
8997 return gen_type_name_0 (type); | |
8998 } | |
8999 | |
9000 /* Given a method tree, put a printable description into the given | |
9001 buffer (overwriting) and return a pointer to the buffer. */ | |
9002 | |
9003 static char * | |
9004 gen_method_decl (tree method) | |
9005 { | |
9006 tree chain; | |
9007 | |
9008 strcpy (errbuf, "("); /* NB: Do _not_ call strcat() here. */ | |
9009 gen_type_name_0 (TREE_VALUE (TREE_TYPE (method))); | |
9010 strcat (errbuf, ")"); | |
9011 chain = METHOD_SEL_ARGS (method); | |
9012 | |
9013 if (chain) | |
9014 { | |
9015 /* We have a chain of keyword_decls. */ | |
9016 do | |
9017 { | |
9018 if (KEYWORD_KEY_NAME (chain)) | |
9019 strcat (errbuf, IDENTIFIER_POINTER (KEYWORD_KEY_NAME (chain))); | |
9020 | |
9021 strcat (errbuf, ":("); | |
9022 gen_type_name_0 (TREE_VALUE (TREE_TYPE (chain))); | |
9023 strcat (errbuf, ")"); | |
9024 | |
9025 strcat (errbuf, IDENTIFIER_POINTER (KEYWORD_ARG_NAME (chain))); | |
9026 if ((chain = DECL_CHAIN (chain))) | |
9027 strcat (errbuf, " "); | |
9028 } | |
9029 while (chain); | |
9030 | |
9031 if (METHOD_ADD_ARGS (method)) | |
9032 { | |
9033 chain = TREE_CHAIN (METHOD_ADD_ARGS (method)); | |
9034 | |
9035 /* Know we have a chain of parm_decls. */ | |
9036 while (chain) | |
9037 { | |
9038 strcat (errbuf, ", "); | |
9039 gen_type_name_0 (TREE_TYPE (TREE_VALUE (chain))); | |
9040 chain = TREE_CHAIN (chain); | |
9041 } | |
9042 | |
9043 if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) | |
9044 strcat (errbuf, ", ..."); | |
9045 } | |
9046 } | |
9047 | |
9048 else | |
9049 /* We have a unary selector. */ | |
9050 strcat (errbuf, IDENTIFIER_POINTER (METHOD_SEL_NAME (method))); | |
9051 | |
9052 return errbuf; | |
9053 } | |
9054 | |
9055 /* Debug info. */ | |
9056 | |
9057 | |
9058 /* Dump an @interface declaration of the supplied class CHAIN to the | |
9059 supplied file FP. Used to implement the -gen-decls option (which | |
9060 prints out an @interface declaration of all classes compiled in | |
9061 this run); potentially useful for debugging the compiler too. */ | |
9062 void | |
9063 dump_interface (FILE *fp, tree chain) | |
9064 { | |
9065 /* FIXME: A heap overflow here whenever a method (or ivar) | |
9066 declaration is so long that it doesn't fit in the buffer. The | |
9067 code and all the related functions should be rewritten to avoid | |
9068 using fixed size buffers. */ | |
9069 const char *my_name = IDENTIFIER_POINTER (CLASS_NAME (chain)); | |
9070 tree ivar_decls = CLASS_RAW_IVARS (chain); | |
9071 tree nst_methods = CLASS_NST_METHODS (chain); | |
9072 tree cls_methods = CLASS_CLS_METHODS (chain); | |
9073 | |
9074 fprintf (fp, "\n@interface %s", my_name); | |
9075 | |
9076 /* CLASS_SUPER_NAME is used to store the superclass name for | |
9077 classes, and the category name for categories. */ | |
9078 if (CLASS_SUPER_NAME (chain)) | |
9079 { | |
9080 const char *name = IDENTIFIER_POINTER (CLASS_SUPER_NAME (chain)); | |
9081 | |
9082 switch (TREE_CODE (chain)) | |
9083 { | |
9084 case CATEGORY_IMPLEMENTATION_TYPE: | |
9085 case CATEGORY_INTERFACE_TYPE: | |
9086 fprintf (fp, " (%s)\n", name); | |
9087 break; | |
9088 default: | |
9089 fprintf (fp, " : %s\n", name); | |
9090 break; | |
9091 } | |
9092 } | |
9093 else | |
9094 fprintf (fp, "\n"); | |
9095 | |
9096 /* FIXME - the following doesn't seem to work at the moment. */ | |
9097 if (ivar_decls) | |
9098 { | |
9099 fprintf (fp, "{\n"); | |
9100 do | |
9101 { | |
9102 fprintf (fp, "\t%s;\n", gen_declaration (ivar_decls)); | |
9103 ivar_decls = TREE_CHAIN (ivar_decls); | |
9104 } | |
9105 while (ivar_decls); | |
9106 fprintf (fp, "}\n"); | |
9107 } | |
9108 | |
9109 while (nst_methods) | |
9110 { | |
9111 fprintf (fp, "- %s;\n", gen_method_decl (nst_methods)); | |
9112 nst_methods = TREE_CHAIN (nst_methods); | |
9113 } | |
9114 | |
9115 while (cls_methods) | |
9116 { | |
9117 fprintf (fp, "+ %s;\n", gen_method_decl (cls_methods)); | |
9118 cls_methods = TREE_CHAIN (cls_methods); | |
9119 } | |
9120 | |
9121 fprintf (fp, "@end\n"); | |
9122 } | |
9123 | |
9124 #if 0 | |
9125 /* Produce the pretty printing for an Objective-C method. This is | |
9126 currently unused, but could be handy while reorganizing the pretty | |
9127 printing to be more robust. */ | |
9128 static const char * | |
9129 objc_pretty_print_method (bool is_class_method, | |
9130 const char *class_name, | |
9131 const char *category_name, | |
9132 const char *selector) | |
9133 { | |
9134 if (category_name) | |
9135 { | |
9136 char *result = XNEWVEC (char, strlen (class_name) + strlen (category_name) | |
9137 + strlen (selector) + 7); | |
9138 | |
9139 if (is_class_method) | |
9140 sprintf (result, "+[%s(%s) %s]", class_name, category_name, selector); | |
9141 else | |
9142 sprintf (result, "-[%s(%s) %s]", class_name, category_name, selector); | |
9143 | |
9144 return result; | |
9145 } | |
9146 else | |
9147 { | |
9148 char *result = XNEWVEC (char, strlen (class_name) | |
9149 + strlen (selector) + 5); | |
9150 | |
9151 if (is_class_method) | |
9152 sprintf (result, "+[%s %s]", class_name, selector); | |
9153 else | |
9154 sprintf (result, "-[%s %s]", class_name, selector); | |
9155 | |
9156 return result; | |
9157 } | |
9158 } | |
9159 #endif | |
9160 | |
9161 /* Demangle function for Objective-C. Attempt to demangle the | |
9162 function name associated with a method (eg, going from | |
9163 "_i_NSObject__class" to "-[NSObject class]"); usually for the | |
9164 purpose of pretty printing or error messages. Return the demangled | |
9165 name, or NULL if the string is not an Objective-C mangled method | |
9166 name. | |
9167 | |
9168 Because of how the mangling is done, any method that has a '_' in | |
9169 its original name is at risk of being demangled incorrectly. In | |
9170 some cases there are multiple valid ways to demangle a method name | |
9171 and there is no way we can decide. | |
9172 | |
9173 TODO: objc_demangle() can't always get it right; the right way to | |
9174 get this correct for all method names would be to store the | |
9175 Objective-C method name somewhere in the function decl. Then, | |
9176 there is no demangling to do; we'd just pull the method name out of | |
9177 the decl. As an additional bonus, when printing error messages we | |
9178 could check for such a method name, and if we find it, we know the | |
9179 function is actually an Objective-C method and we could print error | |
9180 messages saying "In method '+[NSObject class]" instead of "In | |
9181 function '+[NSObject class]" as we do now. */ | |
9182 static const char * | |
9183 objc_demangle (const char *mangled) | |
9184 { | |
9185 char *demangled, *cp; | |
9186 | |
9187 /* First of all, if the name is too short it can't be an Objective-C | |
9188 mangled method name. */ | |
9189 if (mangled[0] == '\0' || mangled[1] == '\0' || mangled[2] == '\0') | |
9190 return NULL; | |
9191 | |
9192 /* If the name looks like an already demangled one, return it | |
9193 unchanged. This should only happen on Darwin, where method names | |
9194 are mangled differently into a pretty-print form (such as | |
9195 '+[NSObject class]', see darwin.h). In that case, demangling is | |
9196 a no-op, but we need to return the demangled name if it was an | |
9197 ObjC one, and return NULL if not. We should be safe as no C/C++ | |
9198 function can start with "-[" or "+[". */ | |
9199 if ((mangled[0] == '-' || mangled[0] == '+') | |
9200 && (mangled[1] == '[')) | |
9201 return mangled; | |
9202 | |
9203 if (mangled[0] == '_' && | |
9204 (mangled[1] == 'i' || mangled[1] == 'c') && | |
9205 mangled[2] == '_') | |
9206 { | |
9207 cp = demangled = XNEWVEC (char, strlen(mangled) + 2); | |
9208 if (mangled[1] == 'i') | |
9209 *cp++ = '-'; /* for instance method */ | |
9210 else | |
9211 *cp++ = '+'; /* for class method */ | |
9212 *cp++ = '['; /* opening left brace */ | |
9213 strcpy(cp, mangled+3); /* tack on the rest of the mangled name */ | |
9214 while (*cp && *cp == '_') | |
9215 cp++; /* skip any initial underbars in class name */ | |
9216 cp = strchr(cp, '_'); /* find first non-initial underbar */ | |
9217 if (cp == NULL) | |
9218 { | |
9219 free(demangled); /* not mangled name */ | |
9220 return NULL; | |
9221 } | |
9222 if (cp[1] == '_') /* easy case: no category name */ | |
9223 { | |
9224 *cp++ = ' '; /* replace two '_' with one ' ' */ | |
9225 strcpy(cp, mangled + (cp - demangled) + 2); | |
9226 } | |
9227 else | |
9228 { | |
9229 *cp++ = '('; /* less easy case: category name */ | |
9230 cp = strchr(cp, '_'); | |
9231 if (cp == 0) | |
9232 { | |
9233 free(demangled); /* not mangled name */ | |
9234 return NULL; | |
9235 } | |
9236 *cp++ = ')'; | |
9237 *cp++ = ' '; /* overwriting 1st char of method name... */ | |
9238 strcpy(cp, mangled + (cp - demangled)); /* get it back */ | |
9239 } | |
9240 /* Now we have the method name. We need to generally replace | |
9241 '_' with ':' but trying to preserve '_' if it could only have | |
9242 been in the mangled string because it was already in the | |
9243 original name. In cases where it's ambiguous, we assume that | |
9244 any '_' originated from a ':'. */ | |
9245 | |
9246 /* Initial '_'s in method name can't have been generating by | |
9247 converting ':'s. Skip them. */ | |
9248 while (*cp && *cp == '_') | |
9249 cp++; | |
9250 | |
9251 /* If the method name does not end with '_', then it has no | |
9252 arguments and there was no replacement of ':'s with '_'s | |
9253 during mangling. Check for that case, and skip any | |
9254 replacement if so. This at least guarantees that methods | |
9255 with no arguments are always demangled correctly (unless the | |
9256 original name ends with '_'). */ | |
9257 if (*(mangled + strlen (mangled) - 1) != '_') | |
9258 { | |
9259 /* Skip to the end. */ | |
9260 for (; *cp; cp++) | |
9261 ; | |
9262 } | |
9263 else | |
9264 { | |
9265 /* Replace remaining '_' with ':'. This may get it wrong if | |
9266 there were '_'s in the original name. In most cases it | |
9267 is impossible to disambiguate. */ | |
9268 for (; *cp; cp++) | |
9269 if (*cp == '_') | |
9270 *cp = ':'; | |
9271 } | |
9272 *cp++ = ']'; /* closing right brace */ | |
9273 *cp++ = 0; /* string terminator */ | |
9274 return demangled; | |
9275 } | |
9276 else | |
9277 return NULL; /* not an objc mangled name */ | |
9278 } | |
9279 | |
9280 /* Try to pretty-print a decl. If the 'decl' is an Objective-C | |
9281 specific decl, return the printable name for it. If not, return | |
9282 NULL. */ | |
9283 const char * | |
9284 objc_maybe_printable_name (tree decl, int v ATTRIBUTE_UNUSED) | |
9285 { | |
9286 switch (TREE_CODE (decl)) | |
9287 { | |
9288 case FUNCTION_DECL: | |
9289 return objc_demangle (IDENTIFIER_POINTER (DECL_NAME (decl))); | |
9290 | |
9291 /* The following happens when we are printing a deprecation | |
9292 warning for a method. The warn_deprecation() will end up | |
9293 trying to print the decl for INSTANCE_METHOD_DECL or | |
9294 CLASS_METHOD_DECL. It would be nice to be able to print | |
9295 "-[NSObject autorelease] is deprecated", but to do that, we'd | |
9296 need to store the class and method name in the method decl, | |
9297 which we currently don't do. For now, just return the name | |
9298 of the method. We don't return NULL, because that may | |
9299 trigger further attempts to pretty-print the decl in C/C++, | |
9300 but they wouldn't know how to pretty-print it. */ | |
9301 case INSTANCE_METHOD_DECL: | |
9302 case CLASS_METHOD_DECL: | |
9303 return IDENTIFIER_POINTER (DECL_NAME (decl)); | |
9304 /* This happens when printing a deprecation warning for a | |
9305 property. We may want to consider some sort of pretty | |
9306 printing (eg, include the class name where it was declared | |
9307 ?). */ | |
9308 case PROPERTY_DECL: | |
9309 return IDENTIFIER_POINTER (PROPERTY_NAME (decl)); | |
9310 default: | |
9311 return NULL; | |
9312 } | |
9313 } | |
9314 | |
9315 /* Return a printable name for 'decl'. This first tries | |
9316 objc_maybe_printable_name(), and if that fails, it returns the name | |
9317 in the decl. This is used as LANG_HOOKS_DECL_PRINTABLE_NAME for | |
9318 Objective-C; in Objective-C++, setting the hook is not enough | |
9319 because lots of C++ Front-End code calls cxx_printable_name, | |
9320 dump_decl and other C++ functions directly. So instead we have | |
9321 modified dump_decl to call objc_maybe_printable_name directly. */ | |
9322 const char * | |
9323 objc_printable_name (tree decl, int v) | |
9324 { | |
9325 const char *demangled_name = objc_maybe_printable_name (decl, v); | |
9326 | |
9327 if (demangled_name != NULL) | |
9328 return demangled_name; | |
9329 else | |
9330 return IDENTIFIER_POINTER (DECL_NAME (decl)); | |
9331 } | |
9332 | |
9333 /* Routine is called to issue diagnostic when reference to a private | |
9334 ivar is made and no other variable with same name is found in | |
9335 current scope. */ | |
9336 bool | |
9337 objc_diagnose_private_ivar (tree id) | |
9338 { | |
9339 tree ivar; | |
9340 if (!objc_method_context) | |
9341 return false; | |
9342 ivar = is_ivar (objc_ivar_chain, id); | |
9343 if (ivar && is_private (ivar)) | |
9344 { | |
9345 error ("instance variable %qs is declared private", | |
9346 IDENTIFIER_POINTER (id)); | |
9347 return true; | |
9348 } | |
9349 return false; | |
9350 } | |
9351 | |
9352 /* Look up ID as an instance variable. OTHER contains the result of | |
9353 the C or C++ lookup, which we may want to use instead. */ | |
9354 /* To use properties inside an instance method, use self.property. */ | |
9355 tree | |
9356 objc_lookup_ivar (tree other, tree id) | |
9357 { | |
9358 tree ivar; | |
9359 | |
9360 /* If we are not inside of an ObjC method, ivar lookup makes no sense. */ | |
9361 if (!objc_method_context) | |
9362 return other; | |
9363 | |
9364 if (!strcmp (IDENTIFIER_POINTER (id), "super")) | |
9365 /* We have a message to super. */ | |
9366 return get_super_receiver (); | |
9367 | |
9368 /* In a class method, look up an instance variable only as a last | |
9369 resort. */ | |
9370 if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL | |
9371 && other && other != error_mark_node) | |
9372 return other; | |
9373 | |
9374 /* Don't look up the ivar if the user has explicitly advised against | |
9375 it with -fno-local-ivars. */ | |
9376 | |
9377 if (!flag_local_ivars) | |
9378 return other; | |
9379 | |
9380 /* Look up the ivar, but do not use it if it is not accessible. */ | |
9381 ivar = is_ivar (objc_ivar_chain, id); | |
9382 | |
9383 if (!ivar || is_private (ivar)) | |
9384 return other; | |
9385 | |
9386 /* In an instance method, a local variable (or parameter) may hide the | |
9387 instance variable. */ | |
9388 if (TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL | |
9389 && other && other != error_mark_node | |
9390 #ifdef OBJCPLUS | |
9391 && CP_DECL_CONTEXT (other) != global_namespace) | |
9392 #else | |
9393 && !DECL_FILE_SCOPE_P (other)) | |
9394 #endif | |
9395 { | |
9396 if (warn_shadow_ivar == 1 || (warn_shadow && warn_shadow_ivar != 0)) { | |
9397 warning (warn_shadow_ivar ? OPT_Wshadow_ivar : OPT_Wshadow, | |
9398 "local declaration of %qE hides instance variable", id); | |
9399 } | |
9400 | |
9401 return other; | |
9402 } | |
9403 | |
9404 /* At this point, we are either in an instance method with no obscuring | |
9405 local definitions, or in a class method with no alternate definitions | |
9406 at all. */ | |
9407 return build_ivar_reference (id); | |
9408 } | |
9409 | |
9410 /* Possibly rewrite a function CALL into an OBJ_TYPE_REF expression. This | |
9411 needs to be done if we are calling a function through a cast. */ | |
9412 | |
9413 tree | |
9414 objc_rewrite_function_call (tree function, tree first_param) | |
9415 { | |
9416 if (TREE_CODE (function) == NOP_EXPR | |
9417 && TREE_CODE (TREE_OPERAND (function, 0)) == ADDR_EXPR | |
9418 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (function, 0), 0)) | |
9419 == FUNCTION_DECL) | |
9420 { | |
9421 function = build3 (OBJ_TYPE_REF, TREE_TYPE (function), | |
9422 TREE_OPERAND (function, 0), | |
9423 first_param, size_zero_node); | |
9424 } | |
9425 | |
9426 return function; | |
9427 } | |
9428 | |
9429 /* This is called to "gimplify" a PROPERTY_REF node. It builds the | |
9430 corresponding 'getter' function call. Note that we assume the | |
9431 PROPERTY_REF to be valid since we generated it while parsing. */ | |
9432 static void | |
9433 objc_gimplify_property_ref (tree *expr_p) | |
9434 { | |
9435 tree getter = PROPERTY_REF_GETTER_CALL (*expr_p); | |
9436 tree call_exp; | |
9437 | |
9438 if (getter == NULL_TREE) | |
9439 { | |
9440 tree property_decl = PROPERTY_REF_PROPERTY_DECL (*expr_p); | |
9441 /* This can happen if DECL_ARTIFICIAL (*expr_p), but | |
9442 should be impossible for real properties, which always | |
9443 have a getter. */ | |
9444 error_at (EXPR_LOCATION (*expr_p), "no %qs getter found", | |
9445 IDENTIFIER_POINTER (PROPERTY_NAME (property_decl))); | |
9446 /* Try to recover from the error to prevent an ICE. We take | |
9447 zero and cast it to the type of the property. */ | |
9448 *expr_p = convert (TREE_TYPE (property_decl), | |
9449 integer_zero_node); | |
9450 return; | |
9451 } | |
9452 | |
9453 if (PROPERTY_REF_DEPRECATED_GETTER (*expr_p)) | |
9454 { | |
9455 /* PROPERTY_REF_DEPRECATED_GETTER contains the method prototype | |
9456 that is deprecated. */ | |
9457 warn_deprecated_use (PROPERTY_REF_DEPRECATED_GETTER (*expr_p), | |
9458 NULL_TREE); | |
9459 } | |
9460 | |
9461 call_exp = getter; | |
9462 #ifdef OBJCPLUS | |
9463 /* In C++, a getter which returns an aggregate value results in a | |
9464 target_expr which initializes a temporary to the call | |
9465 expression. */ | |
9466 if (TREE_CODE (getter) == TARGET_EXPR) | |
9467 { | |
9468 gcc_assert (MAYBE_CLASS_TYPE_P (TREE_TYPE (getter))); | |
9469 gcc_assert (TREE_CODE (TREE_OPERAND (getter, 0)) == VAR_DECL); | |
9470 call_exp = TREE_OPERAND (getter, 1); | |
9471 } | |
9472 #endif | |
9473 gcc_assert (TREE_CODE (call_exp) == CALL_EXPR); | |
9474 | |
9475 *expr_p = call_exp; | |
9476 } | |
9477 | |
9478 /* This is called when "gimplifying" the trees. We need to gimplify | |
9479 the Objective-C/Objective-C++ specific trees, then hand over the | |
9480 process to C/C++. */ | |
9481 int | |
9482 objc_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p) | |
9483 { | |
9484 enum tree_code code = TREE_CODE (*expr_p); | |
9485 switch (code) | |
9486 { | |
9487 /* Look for the special case of OBJC_TYPE_REF with the address | |
9488 of a function in OBJ_TYPE_REF_EXPR (presumably objc_msgSend | |
9489 or one of its cousins). */ | |
9490 case OBJ_TYPE_REF: | |
9491 if (TREE_CODE (OBJ_TYPE_REF_EXPR (*expr_p)) == ADDR_EXPR | |
9492 && TREE_CODE (TREE_OPERAND (OBJ_TYPE_REF_EXPR (*expr_p), 0)) | |
9493 == FUNCTION_DECL) | |
9494 { | |
9495 enum gimplify_status r0, r1; | |
9496 | |
9497 /* Postincrements in OBJ_TYPE_REF_OBJECT don't affect the | |
9498 value of the OBJ_TYPE_REF, so force them to be emitted | |
9499 during subexpression evaluation rather than after the | |
9500 OBJ_TYPE_REF. This permits objc_msgSend calls in | |
9501 Objective C to use direct rather than indirect calls when | |
9502 the object expression has a postincrement. */ | |
9503 r0 = gimplify_expr (&OBJ_TYPE_REF_OBJECT (*expr_p), pre_p, NULL, | |
9504 is_gimple_val, fb_rvalue); | |
9505 r1 = gimplify_expr (&OBJ_TYPE_REF_EXPR (*expr_p), pre_p, post_p, | |
9506 is_gimple_val, fb_rvalue); | |
9507 | |
9508 return MIN (r0, r1); | |
9509 } | |
9510 break; | |
9511 case PROPERTY_REF: | |
9512 objc_gimplify_property_ref (expr_p); | |
9513 /* Do not return yet; let C/C++ gimplify the resulting expression. */ | |
9514 break; | |
9515 default: | |
9516 break; | |
9517 } | |
9518 | |
9519 #ifdef OBJCPLUS | |
9520 return (enum gimplify_status) cp_gimplify_expr (expr_p, pre_p, post_p); | |
9521 #else | |
9522 return (enum gimplify_status) c_gimplify_expr (expr_p, pre_p, post_p); | |
9523 #endif | |
9524 } | |
9525 | |
9526 /* --- FAST ENUMERATION --- */ | |
9527 /* Begin code generation for fast enumeration (foreach) ... */ | |
9528 | |
9529 /* Defines | |
9530 | |
9531 struct __objcFastEnumerationState | |
9532 { | |
9533 unsigned long state; | |
9534 id *itemsPtr; | |
9535 unsigned long *mutationsPtr; | |
9536 unsigned long extra[5]; | |
9537 }; | |
9538 | |
9539 Confusingly enough, NSFastEnumeration is then defined by libraries | |
9540 to be the same structure. | |
9541 */ | |
9542 | |
9543 static void | |
9544 build_fast_enumeration_state_template (void) | |
9545 { | |
9546 tree decls, *chain = NULL; | |
9547 | |
9548 /* { */ | |
9549 objc_fast_enumeration_state_template = objc_start_struct (get_identifier | |
9550 (TAG_FAST_ENUMERATION_STATE)); | |
9551 | |
9552 /* unsigned long state; */ | |
9553 decls = add_field_decl (long_unsigned_type_node, "state", &chain); | |
9554 | |
9555 /* id *itemsPtr; */ | |
9556 add_field_decl (build_pointer_type (objc_object_type), | |
9557 "itemsPtr", &chain); | |
9558 | |
9559 /* unsigned long *mutationsPtr; */ | |
9560 add_field_decl (build_pointer_type (long_unsigned_type_node), | |
9561 "mutationsPtr", &chain); | |
9562 | |
9563 /* unsigned long extra[5]; */ | |
9564 add_field_decl (build_sized_array_type (long_unsigned_type_node, 5), | |
9565 "extra", &chain); | |
9566 | |
9567 /* } */ | |
9568 objc_finish_struct (objc_fast_enumeration_state_template, decls); | |
9569 } | |
9570 | |
9571 /* | |
9572 'objc_finish_foreach_loop()' generates the code for an Objective-C | |
9573 foreach loop. The 'location' argument is the location of the 'for' | |
9574 that starts the loop. The 'object_expression' is the expression of | |
9575 the 'object' that iterates; the 'collection_expression' is the | |
9576 expression of the collection that we iterate over (we need to make | |
9577 sure we evaluate this only once); the 'for_body' is the set of | |
9578 statements to be executed in each iteration; 'break_label' and | |
9579 'continue_label' are the break and continue labels which we need to | |
9580 emit since the <statements> may be jumping to 'break_label' (if they | |
9581 contain 'break') or to 'continue_label' (if they contain | |
9582 'continue'). | |
9583 | |
9584 The syntax is | |
9585 | |
9586 for (<object expression> in <collection expression>) | |
9587 <statements> | |
9588 | |
9589 which is compiled into the following blurb: | |
9590 | |
9591 { | |
9592 id __objc_foreach_collection; | |
9593 __objc_fast_enumeration_state __objc_foreach_enum_state; | |
9594 unsigned long __objc_foreach_batchsize; | |
9595 id __objc_foreach_items[16]; | |
9596 __objc_foreach_collection = <collection expression>; | |
9597 __objc_foreach_enum_state = { 0 }; | |
9598 __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; | |
9599 | |
9600 if (__objc_foreach_batchsize == 0) | |
9601 <object expression> = nil; | |
9602 else | |
9603 { | |
9604 unsigned long __objc_foreach_mutations_pointer = *__objc_foreach_enum_state.mutationsPtr; | |
9605 next_batch: | |
9606 { | |
9607 unsigned long __objc_foreach_index; | |
9608 __objc_foreach_index = 0; | |
9609 | |
9610 next_object: | |
9611 if (__objc_foreach_mutation_pointer != *__objc_foreach_enum_state.mutationsPtr) objc_enumeration_mutation (<collection expression>); | |
9612 <object expression> = enumState.itemsPtr[__objc_foreach_index]; | |
9613 <statements> [PS: inside <statments>, 'break' jumps to break_label and 'continue' jumps to continue_label] | |
9614 | |
9615 continue_label: | |
9616 __objc_foreach_index++; | |
9617 if (__objc_foreach_index < __objc_foreach_batchsize) goto next_object; | |
9618 __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; | |
9619 } | |
9620 if (__objc_foreach_batchsize != 0) goto next_batch; | |
9621 <object expression> = nil; | |
9622 break_label: | |
9623 } | |
9624 } | |
9625 | |
9626 'statements' may contain a 'continue' or 'break' instruction, which | |
9627 the user expects to 'continue' or 'break' the entire foreach loop. | |
9628 We are provided the labels that 'break' and 'continue' jump to, so | |
9629 we place them where we want them to jump to when they pick them. | |
9630 | |
9631 Optimization TODO: we could cache the IMP of | |
9632 countByEnumeratingWithState:objects:count:. | |
9633 */ | |
9634 | |
9635 /* If you need to debug objc_finish_foreach_loop(), uncomment the following line. */ | |
9636 /* #define DEBUG_OBJC_FINISH_FOREACH_LOOP 1 */ | |
9637 | |
9638 #ifdef DEBUG_OBJC_FINISH_FOREACH_LOOP | |
9639 #include "tree-pretty-print.h" | |
9640 #endif | |
9641 | |
9642 void | |
9643 objc_finish_foreach_loop (location_t location, tree object_expression, tree collection_expression, tree for_body, | |
9644 tree break_label, tree continue_label) | |
9645 { | |
9646 /* A tree representing the __objcFastEnumerationState struct type, | |
9647 or NSFastEnumerationState struct, whatever we are using. */ | |
9648 tree objc_fast_enumeration_state_type; | |
9649 | |
9650 /* The trees representing the declarations of each of the local variables. */ | |
9651 tree objc_foreach_collection_decl; | |
9652 tree objc_foreach_enum_state_decl; | |
9653 tree objc_foreach_items_decl; | |
9654 tree objc_foreach_batchsize_decl; | |
9655 tree objc_foreach_mutations_pointer_decl; | |
9656 tree objc_foreach_index_decl; | |
9657 | |
9658 /* A tree representing the selector countByEnumeratingWithState:objects:count:. */ | |
9659 tree selector_name; | |
9660 | |
9661 /* A tree representing the local bind. */ | |
9662 tree bind; | |
9663 | |
9664 /* A tree representing the external 'if (__objc_foreach_batchsize)' */ | |
9665 tree first_if; | |
9666 | |
9667 /* A tree representing the 'else' part of 'first_if' */ | |
9668 tree first_else; | |
9669 | |
9670 /* A tree representing the 'next_batch' label. */ | |
9671 tree next_batch_label_decl; | |
9672 | |
9673 /* A tree representing the binding after the 'next_batch' label. */ | |
9674 tree next_batch_bind; | |
9675 | |
9676 /* A tree representing the 'next_object' label. */ | |
9677 tree next_object_label_decl; | |
9678 | |
9679 /* Temporary variables. */ | |
9680 tree t; | |
9681 int i; | |
9682 | |
9683 if (flag_objc1_only) | |
9684 error_at (location, "fast enumeration is not available in Objective-C 1.0"); | |
9685 | |
9686 if (object_expression == error_mark_node) | |
9687 return; | |
9688 | |
9689 if (collection_expression == error_mark_node) | |
9690 return; | |
9691 | |
9692 if (!objc_type_valid_for_messaging (TREE_TYPE (object_expression), true)) | |
9693 { | |
9694 error_at (location, "iterating variable in fast enumeration is not an object"); | |
9695 return; | |
9696 } | |
9697 | |
9698 if (!objc_type_valid_for_messaging (TREE_TYPE (collection_expression), true)) | |
9699 { | |
9700 error_at (location, "collection in fast enumeration is not an object"); | |
9701 return; | |
9702 } | |
9703 | |
9704 /* TODO: Check that object_expression is either a variable | |
9705 declaration, or an lvalue. */ | |
9706 | |
9707 /* This kludge is an idea from apple. We use the | |
9708 __objcFastEnumerationState struct implicitly defined by the | |
9709 compiler, unless a NSFastEnumerationState struct has been defined | |
9710 (by a Foundation library such as GNUstep Base) in which case, we | |
9711 use that one. | |
9712 */ | |
9713 objc_fast_enumeration_state_type = objc_fast_enumeration_state_template; | |
9714 { | |
9715 tree objc_NSFastEnumeration_type = lookup_name (get_identifier ("NSFastEnumerationState")); | |
9716 | |
9717 if (objc_NSFastEnumeration_type) | |
9718 { | |
9719 /* TODO: We really need to check that | |
9720 objc_NSFastEnumeration_type is the same as ours! */ | |
9721 if (TREE_CODE (objc_NSFastEnumeration_type) == TYPE_DECL) | |
9722 { | |
9723 /* If it's a typedef, use the original type. */ | |
9724 if (DECL_ORIGINAL_TYPE (objc_NSFastEnumeration_type)) | |
9725 objc_fast_enumeration_state_type = DECL_ORIGINAL_TYPE (objc_NSFastEnumeration_type); | |
9726 else | |
9727 objc_fast_enumeration_state_type = TREE_TYPE (objc_NSFastEnumeration_type); | |
9728 } | |
9729 } | |
9730 } | |
9731 | |
9732 /* { */ | |
9733 /* Done by c-parser.c. */ | |
9734 | |
9735 /* type object; */ | |
9736 /* Done by c-parser.c. */ | |
9737 | |
9738 /* Disable warnings that 'object' is unused. For example the code | |
9739 | |
9740 for (id object in collection) | |
9741 i++; | |
9742 | |
9743 which can be used to count how many objects there are in the | |
9744 collection is fine and should generate no warnings even if | |
9745 'object' is technically unused. */ | |
9746 TREE_USED (object_expression) = 1; | |
9747 if (DECL_P (object_expression)) | |
9748 DECL_READ_P (object_expression) = 1; | |
9749 | |
9750 /* id __objc_foreach_collection */ | |
9751 objc_foreach_collection_decl = objc_create_temporary_var (objc_object_type, "__objc_foreach_collection"); | |
9752 | |
9753 /* __objcFastEnumerationState __objc_foreach_enum_state; */ | |
9754 objc_foreach_enum_state_decl = objc_create_temporary_var (objc_fast_enumeration_state_type, "__objc_foreach_enum_state"); | |
9755 TREE_CHAIN (objc_foreach_enum_state_decl) = objc_foreach_collection_decl; | |
9756 | |
9757 /* id __objc_foreach_items[16]; */ | |
9758 objc_foreach_items_decl = objc_create_temporary_var (build_sized_array_type (objc_object_type, 16), "__objc_foreach_items"); | |
9759 TREE_CHAIN (objc_foreach_items_decl) = objc_foreach_enum_state_decl; | |
9760 | |
9761 /* unsigned long __objc_foreach_batchsize; */ | |
9762 objc_foreach_batchsize_decl = objc_create_temporary_var (long_unsigned_type_node, "__objc_foreach_batchsize"); | |
9763 TREE_CHAIN (objc_foreach_batchsize_decl) = objc_foreach_items_decl; | |
9764 | |
9765 /* Generate the local variable binding. */ | |
9766 bind = build3 (BIND_EXPR, void_type_node, objc_foreach_batchsize_decl, NULL, NULL); | |
9767 SET_EXPR_LOCATION (bind, location); | |
9768 TREE_SIDE_EFFECTS (bind) = 1; | |
9769 | |
9770 /* __objc_foreach_collection = <collection expression>; */ | |
9771 t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_collection_decl, collection_expression); | |
9772 SET_EXPR_LOCATION (t, location); | |
9773 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); | |
9774 /* We have used 'collection_expression'. */ | |
9775 mark_exp_read (collection_expression); | |
9776 | |
9777 /* __objc_foreach_enum_state.state = 0; */ | |
9778 t = build2 (MODIFY_EXPR, void_type_node, objc_build_component_ref (objc_foreach_enum_state_decl, | |
9779 get_identifier ("state")), | |
9780 build_int_cst (long_unsigned_type_node, 0)); | |
9781 SET_EXPR_LOCATION (t, location); | |
9782 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); | |
9783 | |
9784 /* __objc_foreach_enum_state.itemsPtr = NULL; */ | |
9785 t = build2 (MODIFY_EXPR, void_type_node, objc_build_component_ref (objc_foreach_enum_state_decl, | |
9786 get_identifier ("itemsPtr")), | |
9787 null_pointer_node); | |
9788 SET_EXPR_LOCATION (t, location); | |
9789 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); | |
9790 | |
9791 /* __objc_foreach_enum_state.mutationsPtr = NULL; */ | |
9792 t = build2 (MODIFY_EXPR, void_type_node, objc_build_component_ref (objc_foreach_enum_state_decl, | |
9793 get_identifier ("mutationsPtr")), | |
9794 null_pointer_node); | |
9795 SET_EXPR_LOCATION (t, location); | |
9796 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); | |
9797 | |
9798 /* __objc_foreach_enum_state.extra[0] = 0; */ | |
9799 /* __objc_foreach_enum_state.extra[1] = 0; */ | |
9800 /* __objc_foreach_enum_state.extra[2] = 0; */ | |
9801 /* __objc_foreach_enum_state.extra[3] = 0; */ | |
9802 /* __objc_foreach_enum_state.extra[4] = 0; */ | |
9803 for (i = 0; i < 5 ; i++) | |
9804 { | |
9805 t = build2 (MODIFY_EXPR, void_type_node, | |
9806 build_array_ref (location, objc_build_component_ref (objc_foreach_enum_state_decl, | |
9807 get_identifier ("extra")), | |
9808 build_int_cst (NULL_TREE, i)), | |
9809 build_int_cst (long_unsigned_type_node, 0)); | |
9810 SET_EXPR_LOCATION (t, location); | |
9811 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); | |
9812 } | |
9813 | |
9814 /* __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; */ | |
9815 selector_name = get_identifier ("countByEnumeratingWithState:objects:count:"); | |
9816 #ifdef OBJCPLUS | |
9817 t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, | |
9818 /* Parameters. */ | |
9819 tree_cons /* &__objc_foreach_enum_state */ | |
9820 (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), | |
9821 tree_cons /* __objc_foreach_items */ | |
9822 (NULL_TREE, objc_foreach_items_decl, | |
9823 tree_cons /* 16 */ | |
9824 (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); | |
9825 #else | |
9826 /* In C, we need to decay the __objc_foreach_items array that we are passing. */ | |
9827 { | |
9828 struct c_expr array; | |
9829 array.value = objc_foreach_items_decl; | |
9830 t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, | |
9831 /* Parameters. */ | |
9832 tree_cons /* &__objc_foreach_enum_state */ | |
9833 (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), | |
9834 tree_cons /* __objc_foreach_items */ | |
9835 (NULL_TREE, default_function_array_conversion (location, array).value, | |
9836 tree_cons /* 16 */ | |
9837 (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); | |
9838 } | |
9839 #endif | |
9840 t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_batchsize_decl, | |
9841 convert (long_unsigned_type_node, t)); | |
9842 SET_EXPR_LOCATION (t, location); | |
9843 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); | |
9844 | |
9845 /* if (__objc_foreach_batchsize == 0) */ | |
9846 first_if = build3 (COND_EXPR, void_type_node, | |
9847 /* Condition. */ | |
9848 c_fully_fold | |
9849 (c_common_truthvalue_conversion | |
9850 (location, | |
9851 build_binary_op (location, | |
9852 EQ_EXPR, | |
9853 objc_foreach_batchsize_decl, | |
9854 build_int_cst (long_unsigned_type_node, 0), 1)), | |
9855 false, NULL), | |
9856 /* Then block (we fill it in later). */ | |
9857 NULL_TREE, | |
9858 /* Else block (we fill it in later). */ | |
9859 NULL_TREE); | |
9860 SET_EXPR_LOCATION (first_if, location); | |
9861 append_to_statement_list (first_if, &BIND_EXPR_BODY (bind)); | |
9862 | |
9863 /* then <object expression> = nil; */ | |
9864 t = build2 (MODIFY_EXPR, void_type_node, object_expression, convert (objc_object_type, null_pointer_node)); | |
9865 SET_EXPR_LOCATION (t, location); | |
9866 COND_EXPR_THEN (first_if) = t; | |
9867 | |
9868 /* Now we build the 'else' part of the if; once we finish building | |
9869 it, we attach it to first_if as the 'else' part. */ | |
9870 | |
9871 /* else */ | |
9872 /* { */ | |
9873 | |
9874 /* unsigned long __objc_foreach_mutations_pointer; */ | |
9875 objc_foreach_mutations_pointer_decl = objc_create_temporary_var (long_unsigned_type_node, "__objc_foreach_mutations_pointer"); | |
9876 | |
9877 /* Generate the local variable binding. */ | |
9878 first_else = build3 (BIND_EXPR, void_type_node, objc_foreach_mutations_pointer_decl, NULL, NULL); | |
9879 SET_EXPR_LOCATION (first_else, location); | |
9880 TREE_SIDE_EFFECTS (first_else) = 1; | |
9881 | |
9882 /* __objc_foreach_mutations_pointer = *__objc_foreach_enum_state.mutationsPtr; */ | |
9883 t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_mutations_pointer_decl, | |
9884 build_indirect_ref (location, objc_build_component_ref (objc_foreach_enum_state_decl, | |
9885 get_identifier ("mutationsPtr")), | |
9886 RO_UNARY_STAR)); | |
9887 SET_EXPR_LOCATION (t, location); | |
9888 append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); | |
9889 | |
9890 /* next_batch: */ | |
9891 next_batch_label_decl = create_artificial_label (location); | |
9892 t = build1 (LABEL_EXPR, void_type_node, next_batch_label_decl); | |
9893 SET_EXPR_LOCATION (t, location); | |
9894 append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); | |
9895 | |
9896 /* { */ | |
9897 | |
9898 /* unsigned long __objc_foreach_index; */ | |
9899 objc_foreach_index_decl = objc_create_temporary_var (long_unsigned_type_node, "__objc_foreach_index"); | |
9900 | |
9901 /* Generate the local variable binding. */ | |
9902 next_batch_bind = build3 (BIND_EXPR, void_type_node, objc_foreach_index_decl, NULL, NULL); | |
9903 SET_EXPR_LOCATION (next_batch_bind, location); | |
9904 TREE_SIDE_EFFECTS (next_batch_bind) = 1; | |
9905 append_to_statement_list (next_batch_bind, &BIND_EXPR_BODY (first_else)); | |
9906 | |
9907 /* __objc_foreach_index = 0; */ | |
9908 t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_index_decl, | |
9909 build_int_cst (long_unsigned_type_node, 0)); | |
9910 SET_EXPR_LOCATION (t, location); | |
9911 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9912 | |
9913 /* next_object: */ | |
9914 next_object_label_decl = create_artificial_label (location); | |
9915 t = build1 (LABEL_EXPR, void_type_node, next_object_label_decl); | |
9916 SET_EXPR_LOCATION (t, location); | |
9917 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9918 | |
9919 /* if (__objc_foreach_mutation_pointer != *__objc_foreach_enum_state.mutationsPtr) objc_enumeration_mutation (<collection expression>); */ | |
9920 t = build3 (COND_EXPR, void_type_node, | |
9921 /* Condition. */ | |
9922 c_fully_fold | |
9923 (c_common_truthvalue_conversion | |
9924 (location, | |
9925 build_binary_op | |
9926 (location, | |
9927 NE_EXPR, | |
9928 objc_foreach_mutations_pointer_decl, | |
9929 build_indirect_ref (location, | |
9930 objc_build_component_ref (objc_foreach_enum_state_decl, | |
9931 get_identifier ("mutationsPtr")), | |
9932 RO_UNARY_STAR), 1)), | |
9933 false, NULL), | |
9934 /* Then block. */ | |
9935 build_function_call (input_location, | |
9936 objc_enumeration_mutation_decl, | |
9937 tree_cons (NULL, collection_expression, NULL)), | |
9938 /* Else block. */ | |
9939 NULL_TREE); | |
9940 SET_EXPR_LOCATION (t, location); | |
9941 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9942 | |
9943 /* <object expression> = enumState.itemsPtr[__objc_foreach_index]; */ | |
9944 t = build2 (MODIFY_EXPR, void_type_node, object_expression, | |
9945 build_array_ref (location, objc_build_component_ref (objc_foreach_enum_state_decl, | |
9946 get_identifier ("itemsPtr")), | |
9947 objc_foreach_index_decl)); | |
9948 SET_EXPR_LOCATION (t, location); | |
9949 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9950 | |
9951 /* <statements> [PS: in <statments>, 'break' jumps to break_label and 'continue' jumps to continue_label] */ | |
9952 append_to_statement_list (for_body, &BIND_EXPR_BODY (next_batch_bind)); | |
9953 | |
9954 /* continue_label: */ | |
9955 if (continue_label) | |
9956 { | |
9957 t = build1 (LABEL_EXPR, void_type_node, continue_label); | |
9958 SET_EXPR_LOCATION (t, location); | |
9959 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9960 } | |
9961 | |
9962 /* __objc_foreach_index++; */ | |
9963 t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_index_decl, | |
9964 build_binary_op (location, | |
9965 PLUS_EXPR, | |
9966 objc_foreach_index_decl, | |
9967 build_int_cst (long_unsigned_type_node, 1), 1)); | |
9968 SET_EXPR_LOCATION (t, location); | |
9969 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9970 | |
9971 /* if (__objc_foreach_index < __objc_foreach_batchsize) goto next_object; */ | |
9972 t = build3 (COND_EXPR, void_type_node, | |
9973 /* Condition. */ | |
9974 c_fully_fold | |
9975 (c_common_truthvalue_conversion | |
9976 (location, | |
9977 build_binary_op (location, | |
9978 LT_EXPR, | |
9979 objc_foreach_index_decl, | |
9980 objc_foreach_batchsize_decl, 1)), | |
9981 false, NULL), | |
9982 /* Then block. */ | |
9983 build1 (GOTO_EXPR, void_type_node, next_object_label_decl), | |
9984 /* Else block. */ | |
9985 NULL_TREE); | |
9986 SET_EXPR_LOCATION (t, location); | |
9987 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
9988 | |
9989 /* __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; */ | |
9990 #ifdef OBJCPLUS | |
9991 t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, | |
9992 /* Parameters. */ | |
9993 tree_cons /* &__objc_foreach_enum_state */ | |
9994 (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), | |
9995 tree_cons /* __objc_foreach_items */ | |
9996 (NULL_TREE, objc_foreach_items_decl, | |
9997 tree_cons /* 16 */ | |
9998 (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); | |
9999 #else | |
10000 /* In C, we need to decay the __objc_foreach_items array that we are passing. */ | |
10001 { | |
10002 struct c_expr array; | |
10003 array.value = objc_foreach_items_decl; | |
10004 t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, | |
10005 /* Parameters. */ | |
10006 tree_cons /* &__objc_foreach_enum_state */ | |
10007 (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), | |
10008 tree_cons /* __objc_foreach_items */ | |
10009 (NULL_TREE, default_function_array_conversion (location, array).value, | |
10010 tree_cons /* 16 */ | |
10011 (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); | |
10012 } | |
10013 #endif | |
10014 t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_batchsize_decl, | |
10015 convert (long_unsigned_type_node, t)); | |
10016 SET_EXPR_LOCATION (t, location); | |
10017 append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); | |
10018 | |
10019 /* } */ | |
10020 | |
10021 /* if (__objc_foreach_batchsize != 0) goto next_batch; */ | |
10022 t = build3 (COND_EXPR, void_type_node, | |
10023 /* Condition. */ | |
10024 c_fully_fold | |
10025 (c_common_truthvalue_conversion | |
10026 (location, | |
10027 build_binary_op (location, | |
10028 NE_EXPR, | |
10029 objc_foreach_batchsize_decl, | |
10030 build_int_cst (long_unsigned_type_node, 0), 1)), | |
10031 false, NULL), | |
10032 /* Then block. */ | |
10033 build1 (GOTO_EXPR, void_type_node, next_batch_label_decl), | |
10034 /* Else block. */ | |
10035 NULL_TREE); | |
10036 SET_EXPR_LOCATION (t, location); | |
10037 append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); | |
10038 | |
10039 /* <object expression> = nil; */ | |
10040 t = build2 (MODIFY_EXPR, void_type_node, object_expression, convert (objc_object_type, null_pointer_node)); | |
10041 SET_EXPR_LOCATION (t, location); | |
10042 append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); | |
10043 | |
10044 /* break_label: */ | |
10045 if (break_label) | |
10046 { | |
10047 t = build1 (LABEL_EXPR, void_type_node, break_label); | |
10048 SET_EXPR_LOCATION (t, location); | |
10049 append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); | |
10050 } | |
10051 | |
10052 /* } */ | |
10053 COND_EXPR_ELSE (first_if) = first_else; | |
10054 | |
10055 /* Do the whole thing. */ | |
10056 add_stmt (bind); | |
10057 | |
10058 #ifdef DEBUG_OBJC_FINISH_FOREACH_LOOP | |
10059 /* This will print to stderr the whole blurb generated by the | |
10060 compiler while compiling (assuming the compiler doesn't crash | |
10061 before getting here). | |
10062 */ | |
10063 debug_generic_stmt (bind); | |
10064 #endif | |
10065 | |
10066 /* } */ | |
10067 /* Done by c-parser.c */ | |
10068 } | |
10069 | |
10070 /* --- SUPPORT FOR FORMAT ARG CHECKING --- */ | |
10071 /* Return true if we have an NxString object pointer. */ | |
10072 | |
10073 bool | |
10074 objc_string_ref_type_p (tree strp) | |
10075 { | |
10076 tree tmv; | |
10077 if (!strp || TREE_CODE (strp) != POINTER_TYPE) | |
10078 return false; | |
10079 | |
10080 tmv = TYPE_MAIN_VARIANT (TREE_TYPE (strp)); | |
10081 tmv = OBJC_TYPE_NAME (tmv); | |
10082 return (tmv | |
10083 && TREE_CODE (tmv) == IDENTIFIER_NODE | |
10084 && IDENTIFIER_POINTER (tmv) | |
10085 && !strncmp (IDENTIFIER_POINTER (tmv), "NSString", 8)); | |
10086 } | |
10087 | |
10088 /* At present the behavior of this is undefined and it does nothing. */ | |
10089 void | |
10090 objc_check_format_arg (tree ARG_UNUSED (format_arg), | |
10091 tree ARG_UNUSED (args_list)) | |
10092 { | |
10093 } | |
10094 | |
10095 void | |
10096 objc_common_init_ts (void) | |
10097 { | |
10098 c_common_init_ts (); | |
10099 | |
10100 MARK_TS_DECL_NON_COMMON (CLASS_METHOD_DECL); | |
10101 MARK_TS_DECL_NON_COMMON (INSTANCE_METHOD_DECL); | |
10102 MARK_TS_DECL_NON_COMMON (KEYWORD_DECL); | |
10103 MARK_TS_DECL_NON_COMMON (PROPERTY_DECL); | |
10104 | |
10105 MARK_TS_COMMON (CLASS_INTERFACE_TYPE); | |
10106 MARK_TS_COMMON (PROTOCOL_INTERFACE_TYPE); | |
10107 MARK_TS_COMMON (CLASS_IMPLEMENTATION_TYPE); | |
10108 | |
10109 MARK_TS_TYPED (MESSAGE_SEND_EXPR); | |
10110 MARK_TS_TYPED (PROPERTY_REF); | |
10111 } | |
10112 | |
10113 size_t | |
10114 objc_common_tree_size (enum tree_code code) | |
10115 { | |
10116 switch (code) | |
10117 { | |
10118 case CLASS_METHOD_DECL: | |
10119 case INSTANCE_METHOD_DECL: | |
10120 case KEYWORD_DECL: | |
10121 case PROPERTY_DECL: return sizeof (tree_decl_non_common); | |
10122 case CLASS_INTERFACE_TYPE: | |
10123 case CLASS_IMPLEMENTATION_TYPE: | |
10124 case CATEGORY_INTERFACE_TYPE: | |
10125 case CATEGORY_IMPLEMENTATION_TYPE: | |
10126 case PROTOCOL_INTERFACE_TYPE: return sizeof (tree_type_non_common); | |
10127 default: | |
10128 gcc_unreachable (); | |
10129 } | |
10130 } | |
10131 | |
10132 | |
10133 #include "gt-objc-objc-act.h" |