1 /* GNU Runtime ABI version 8 2 Copyright (C) 2011 Free Software Foundation, Inc. 3 Contributed by Iain Sandoe (split from objc-act.c) 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 "tree.h" 25 26 #ifdef OBJCPLUS 27 #include "cp-tree.h" 28 #else 29 #include "c-tree.h" 30 #include "c-lang.h" 31 #endif 32 33 #include "langhooks.h" 34 #include "c-family/c-objc.h" 35 #include "objc-act.h" 36 37 /* When building Objective-C++, we are not linking against the C front-end 38 and so need to replicate the C tree-construction functions in some way. */ 39 #ifdef OBJCPLUS 40 #define OBJCP_REMAP_FUNCTIONS 41 #include "objcp-decl.h" 42 #endif /* OBJCPLUS */ 43 44 #include "toplev.h" 45 #include "ggc.h" 46 #include "tree-iterator.h" 47 48 #include "objc-runtime-hooks.h" 49 #include "objc-runtime-shared-support.h" 50 #include "objc-encoding.h" 51 52 /* GNU runtime private definitions. */ 53 #define DEF_CONSTANT_STRING_CLASS_NAME "NXConstantString" 54 55 #define TAG_GETCLASS "objc_get_class" 56 #define TAG_GETMETACLASS "objc_get_meta_class" 57 58 #define TAG_MSGSEND "objc_msg_lookup" 59 #define TAG_MSGSENDSUPER "objc_msg_lookup_super" 60 61 /* GNU-specific tags. */ 62 63 #define TAG_EXECCLASS "__objc_exec_class" 64 #define TAG_GNUINIT "__objc_gnu_init" 65 66 /* The version identifies which language generation and runtime 67 the module (file) was compiled for, and is recorded in the 68 module descriptor. */ 69 #define OBJC_VERSION 8 70 71 #define PROTOCOL_VERSION 2 72 73 /* This macro provides a method of removing ambiguity between runtimes 74 when LTO is in use on targets supporting multiple runtimes. 75 76 For example, at present, any target that includes an implementation of 77 the NeXT runtime needs to place Objective-C meta-data into specific 78 named sections. This should _not_ be done for the GNU runtime, and the 79 folowing macro is used to attach Objective-C private attributes that may 80 be used to identify the runtime for which the meta-data are intended. */ 81 82 #define OBJCMETA(DECL,VERS,KIND) \ 83 if (VERS) \ 84 DECL_ATTRIBUTES (DECL) = build_tree_list ((VERS), (KIND)); 85 86 static void gnu_runtime_01_initialize (void); 87 88 static void build_selector_template (void); 89 90 static tree gnu_runtime_abi_01_super_superclassfield_id (void); 91 92 static tree gnu_runtime_abi_01_class_decl (tree); 93 static tree gnu_runtime_abi_01_metaclass_decl (tree); 94 static tree gnu_runtime_abi_01_category_decl (tree); 95 static tree gnu_runtime_abi_01_protocol_decl (tree); 96 static tree gnu_runtime_abi_01_string_decl (tree, const char *, string_section); 97 98 static tree gnu_runtime_abi_01_get_class_reference (tree); 99 static tree gnu_runtime_abi_01_build_typed_selector_reference (location_t, tree, 100 tree); 101 static tree gnu_runtime_abi_01_get_protocol_reference (location_t, tree); 102 static tree gnu_runtime_abi_01_build_ivar_ref (location_t, tree, tree); 103 static tree gnu_runtime_abi_01_get_class_super_ref (location_t, struct imp_entry *, bool); 104 static tree gnu_runtime_abi_01_get_category_super_ref (location_t, struct imp_entry *, bool); 105 106 static tree gnu_runtime_abi_01_receiver_is_class_object (tree); 107 static void gnu_runtime_abi_01_get_arg_type_list_base (VEC(tree,gc) **, tree, 108 int, int); 109 static tree gnu_runtime_abi_01_build_objc_method_call (location_t, tree, tree, 110 tree, tree, tree, int); 111 112 static bool gnu_runtime_abi_01_setup_const_string_class_decl (void); 113 static tree gnu_runtime_abi_01_build_const_string_constructor (location_t, tree,int); 114 115 static void objc_generate_v1_gnu_metadata (void); 116 117 static tree objc_eh_runtime_type (tree type); 118 static tree objc_eh_personality (void); 119 static tree objc_build_exc_ptr (struct objc_try_context **); 120 static tree build_throw_stmt (location_t, tree, bool); 121 static tree begin_catch (struct objc_try_context **, tree, tree, tree, bool); 122 static void finish_catch (struct objc_try_context **, tree); 123 static tree finish_try_stmt (struct objc_try_context **); 124 125 bool 126 objc_gnu_runtime_abi_01_init (objc_runtime_hooks *rthooks) 127 { 128 /* GNU runtime does not need the compiler to change code in order to do GC. */ 129 if (flag_objc_gc) 130 { 131 warning_at (0, 0, "%<-fobjc-gc%> is ignored for %<-fgnu-runtime%>"); 132 flag_objc_gc = 0; 133 } 134 135 /* Although I guess we could, we don't currently support SJLJ exceptions for the 136 GNU runtime. */ 137 if (flag_objc_sjlj_exceptions) 138 { 139 inform (UNKNOWN_LOCATION, "%<-fobjc-sjlj-exceptions%> is ignored for %<-fgnu-runtime%>"); 140 flag_objc_sjlj_exceptions = 0; 141 } 142 143 /* TODO: Complain if -fobjc-abi-version=N was used. */ 144 145 /* TODO: Complain if -fobj-nilcheck was used. */ 146 147 rthooks->initialize = gnu_runtime_01_initialize; 148 rthooks->default_constant_string_class_name = DEF_CONSTANT_STRING_CLASS_NAME; 149 rthooks->tag_getclass = TAG_GETCLASS; 150 rthooks->super_superclassfield_ident = gnu_runtime_abi_01_super_superclassfield_id; 151 152 rthooks->class_decl = gnu_runtime_abi_01_class_decl; 153 rthooks->metaclass_decl = gnu_runtime_abi_01_metaclass_decl; 154 rthooks->category_decl = gnu_runtime_abi_01_category_decl; 155 rthooks->protocol_decl = gnu_runtime_abi_01_protocol_decl; 156 rthooks->string_decl = gnu_runtime_abi_01_string_decl; 157 158 rthooks->get_class_reference = gnu_runtime_abi_01_get_class_reference; 159 rthooks->build_selector_reference = gnu_runtime_abi_01_build_typed_selector_reference; 160 rthooks->get_protocol_reference = gnu_runtime_abi_01_get_protocol_reference; 161 rthooks->build_ivar_reference = gnu_runtime_abi_01_build_ivar_ref; 162 rthooks->get_class_super_ref = gnu_runtime_abi_01_get_class_super_ref; 163 rthooks->get_category_super_ref = gnu_runtime_abi_01_get_category_super_ref; 164 165 rthooks->receiver_is_class_object = gnu_runtime_abi_01_receiver_is_class_object; 166 rthooks->get_arg_type_list_base = gnu_runtime_abi_01_get_arg_type_list_base; 167 rthooks->build_objc_method_call = gnu_runtime_abi_01_build_objc_method_call; 168 169 rthooks->setup_const_string_class_decl = 170 gnu_runtime_abi_01_setup_const_string_class_decl; 171 rthooks->build_const_string_constructor = 172 gnu_runtime_abi_01_build_const_string_constructor; 173 174 rthooks->build_throw_stmt = build_throw_stmt; 175 rthooks->build_exc_ptr = objc_build_exc_ptr; 176 rthooks->begin_catch = begin_catch; 177 rthooks->finish_catch = finish_catch; 178 rthooks->finish_try_stmt = finish_try_stmt; 179 180 rthooks->generate_metadata = objc_generate_v1_gnu_metadata; 181 return true; 182 } 183 184 static void build_selector_table_decl (void); 185 static void build_class_template (void); 186 static void build_category_template (void); 187 static void build_protocol_template (void); 188 189 static GTY(()) tree objc_meta; 190 static GTY(()) tree meta_base; 191 192 static void gnu_runtime_01_initialize (void) 193 { 194 tree type, ftype, IMP_type; 195 196 /* We do not need to mark GNU ObjC metadata for different sections, 197 however, we do need to make sure that it is not mistaken for NeXT 198 metadata. */ 199 objc_meta = get_identifier ("OBJC1METG"); 200 meta_base = get_identifier ("NONE"); 201 202 /* Declare type of selector-objects that represent an operation name. */ 203 /* `const struct objc_selector *' */ 204 type = xref_tag (RECORD_TYPE, get_identifier (TAG_SELECTOR)); 205 type = build_qualified_type (type, TYPE_QUAL_CONST); 206 objc_selector_type = build_pointer_type (type); 207 208 /* typedef id (*IMP)(id, SEL, ...); */ 209 ftype = build_varargs_function_type_list (objc_object_type, 210 objc_object_type, 211 objc_selector_type, 212 NULL_TREE); 213 214 IMP_type = build_pointer_type (ftype); 215 216 build_class_template (); 217 build_super_template (); 218 build_protocol_template (); 219 build_category_template (); 220 221 /* GNU runtime messenger entry points. */ 222 /* TREE_NOTHROW is cleared for the message-sending functions, 223 because the function that gets called can throw in Obj-C++, or 224 could itself call something that can throw even in Obj-C. */ 225 226 /* IMP objc_msg_lookup (id, SEL); */ 227 type = build_function_type_list (IMP_type, 228 objc_object_type, 229 objc_selector_type, 230 NULL_TREE); 231 232 umsg_decl = add_builtin_function (TAG_MSGSEND, 233 type, 0, NOT_BUILT_IN, 234 NULL, NULL_TREE); 235 TREE_NOTHROW (umsg_decl) = 0; 236 237 /* IMP objc_msg_lookup_super (struct objc_super *, SEL); */ 238 type = build_function_type_list (IMP_type, 239 objc_super_type, 240 objc_selector_type, 241 NULL_TREE); 242 243 umsg_super_decl = add_builtin_function (TAG_MSGSENDSUPER, 244 type, 0, NOT_BUILT_IN, 245 NULL, NULL_TREE); 246 TREE_NOTHROW (umsg_super_decl) = 0; 247 248 /* The following GNU runtime entry point is called to initialize 249 each module: 250 251 __objc_exec_class (void *); */ 252 type = build_function_type_list (void_type_node, 253 ptr_type_node, 254 NULL_TREE); 255 256 execclass_decl = add_builtin_function (TAG_EXECCLASS, 257 type, 0, NOT_BUILT_IN, 258 NULL, NULL_TREE); 259 260 type = build_function_type_list (objc_object_type, 261 const_string_type_node, 262 NULL_TREE); 263 264 /* id objc_getClass (const char *); */ 265 objc_get_class_decl 266 = add_builtin_function (TAG_GETCLASS, type, 0, NOT_BUILT_IN, 267 NULL, NULL_TREE); 268 269 /* id objc_getMetaClass (const char *); */ 270 objc_get_meta_class_decl = add_builtin_function (TAG_GETMETACLASS, type, 271 0, NOT_BUILT_IN, NULL, 272 NULL_TREE); 273 274 /* static SEL _OBJC_SELECTOR_TABLE[]; */ 275 build_selector_table_decl (); 276 277 /* Stuff for properties. 278 The codegen relies on this being NULL for GNU. */ 279 objc_copyStruct_decl = NULL_TREE; 280 281 /* This is the type of all of the following functions 282 bjc_getPropertyStruct() and objc_setPropertyStruct(). */ 283 type = build_function_type_list (void_type_node, 284 ptr_type_node, 285 const_ptr_type_node, 286 ptrdiff_type_node, 287 boolean_type_node, 288 boolean_type_node, 289 NULL_TREE); 290 291 /* Declare the following function: 292 void 293 objc_getPropertyStruct (void *destination, const void *source, 294 ptrdiff_t size, BOOL is_atomic, BOOL has_strong); */ 295 objc_getPropertyStruct_decl = add_builtin_function ("objc_getPropertyStruct", 296 type, 0, NOT_BUILT_IN, 297 NULL, NULL_TREE); 298 TREE_NOTHROW (objc_getPropertyStruct_decl) = 0; 299 /* Declare the following function: 300 void 301 objc_setPropertyStruct (void *destination, const void *source, 302 ptrdiff_t size, BOOL is_atomic, BOOL has_strong); */ 303 objc_setPropertyStruct_decl = add_builtin_function ("objc_setPropertyStruct", 304 type, 0, NOT_BUILT_IN, 305 NULL, NULL_TREE); 306 TREE_NOTHROW (objc_setPropertyStruct_decl) = 0; 307 308 using_eh_for_cleanups (); 309 lang_hooks.eh_runtime_type = objc_eh_runtime_type; 310 lang_hooks.eh_personality = objc_eh_personality; 311 } 312 313 /* --- templates --- */ 314 /* struct _objc_selector { 315 SEL sel_id; 316 char *sel_type; 317 }; */ 318 319 static void 320 build_selector_template (void) 321 { 322 tree decls, *chain = NULL; 323 324 objc_selector_template = objc_start_struct (get_identifier (UTAG_SELECTOR)); 325 326 /* SEL sel_id; */ 327 decls = add_field_decl (objc_selector_type, "sel_id", &chain); 328 329 /* char *sel_type; */ 330 add_field_decl (string_type_node, "sel_type", &chain); 331 332 objc_finish_struct (objc_selector_template, decls); 333 } 334 335 /* struct _objc_class { 336 struct _objc_class *isa; 337 struct _objc_class *super_class; 338 char *name; 339 long version; 340 long info; 341 long instance_size; 342 struct _objc_ivar_list *ivars; 343 struct _objc_method_list *methods; 344 struct sarray *dtable; 345 struct _objc_class *subclass_list; 346 struct _objc_class *sibling_class; 347 struct _objc_protocol_list *protocols; 348 void *gc_object_type; 349 }; */ 350 351 static void 352 build_class_template (void) 353 { 354 tree ptype, decls, *chain = NULL; 355 356 objc_class_template = objc_start_struct (get_identifier (UTAG_CLASS)); 357 358 /* struct _objc_class *isa; */ 359 decls = add_field_decl (build_pointer_type (objc_class_template), 360 "isa", &chain); 361 362 /* struct _objc_class *super_class; */ 363 add_field_decl (build_pointer_type (objc_class_template), 364 "super_class", &chain); 365 366 /* char *name; */ 367 add_field_decl (string_type_node, "name", &chain); 368 369 /* long version; */ 370 add_field_decl (long_integer_type_node, "version", &chain); 371 372 /* long info; */ 373 add_field_decl (long_integer_type_node, "info", &chain); 374 375 /* long instance_size; */ 376 add_field_decl (long_integer_type_node, "instance_size", &chain); 377 378 /* struct _objc_ivar_list *ivars; */ 379 add_field_decl (objc_ivar_list_ptr,"ivars", &chain); 380 381 /* struct _objc_method_list *methods; */ 382 add_field_decl (objc_method_list_ptr, "methods", &chain); 383 384 /* struct sarray *dtable; */ 385 ptype = build_pointer_type(xref_tag (RECORD_TYPE, 386 get_identifier ("sarray"))); 387 add_field_decl (ptype, "dtable", &chain); 388 389 /* struct objc_class *subclass_list; */ 390 ptype = build_pointer_type (objc_class_template); 391 add_field_decl (ptype, "subclass_list", &chain); 392 393 /* struct objc_class *sibling_class; */ 394 ptype = build_pointer_type (objc_class_template); 395 add_field_decl (ptype, "sibling_class", &chain); 396 397 /* struct _objc_protocol **protocol_list; */ 398 ptype = build_pointer_type (build_pointer_type 399 (xref_tag (RECORD_TYPE, 400 get_identifier (UTAG_PROTOCOL)))); 401 add_field_decl (ptype, "protocol_list", &chain); 402 403 /* void *gc_object_type; */ 404 add_field_decl (build_pointer_type (void_type_node), 405 "gc_object_type", &chain); 406 407 objc_finish_struct (objc_class_template, decls); 408 } 409 410 /* struct _objc_category { 411 char *category_name; 412 char *class_name; 413 struct _objc_method_list *instance_methods; 414 struct _objc_method_list *class_methods; 415 struct _objc_protocol_list *protocols; 416 }; */ 417 418 static void 419 build_category_template (void) 420 { 421 tree ptype, decls, *chain = NULL; 422 423 objc_category_template = objc_start_struct (get_identifier (UTAG_CATEGORY)); 424 425 /* char *category_name; */ 426 decls = add_field_decl (string_type_node, "category_name", &chain); 427 428 /* char *class_name; */ 429 add_field_decl (string_type_node, "class_name", &chain); 430 431 /* struct _objc_method_list *instance_methods; */ 432 add_field_decl (objc_method_list_ptr, "instance_methods", &chain); 433 434 /* struct _objc_method_list *class_methods; */ 435 add_field_decl (objc_method_list_ptr, "class_methods", &chain); 436 437 /* struct _objc_protocol **protocol_list; */ 438 ptype = build_pointer_type (build_pointer_type (objc_protocol_template)); 439 add_field_decl (ptype, "protocol_list", &chain); 440 441 objc_finish_struct (objc_category_template, decls); 442 } 443 444 /* struct _objc_protocol { 445 struct _objc_class *isa; 446 char *protocol_name; 447 struct _objc_protocol **protocol_list; 448 struct _objc__method_prototype_list *instance_methods; 449 struct _objc__method_prototype_list *class_methods; 450 }; */ 451 452 static void 453 build_protocol_template (void) 454 { 455 tree ptype, decls, *chain = NULL; 456 457 objc_protocol_template = objc_start_struct (get_identifier (UTAG_PROTOCOL)); 458 459 /* struct _objc_class *isa; */ 460 ptype = build_pointer_type (xref_tag (RECORD_TYPE, 461 get_identifier (UTAG_CLASS))); 462 decls = add_field_decl (ptype, "isa", &chain); 463 464 /* char *protocol_name; */ 465 add_field_decl (string_type_node, "protocol_name", &chain); 466 467 /* struct _objc_protocol **protocol_list; */ 468 ptype = build_pointer_type (build_pointer_type (objc_protocol_template)); 469 add_field_decl (ptype, "protocol_list", &chain); 470 471 /* struct _objc__method_prototype_list *instance_methods; */ 472 add_field_decl (objc_method_proto_list_ptr, "instance_methods", &chain); 473 474 /* struct _objc__method_prototype_list *class_methods; */ 475 add_field_decl (objc_method_proto_list_ptr, "class_methods", &chain); 476 477 objc_finish_struct (objc_protocol_template, decls); 478 } 479 480 /* --- names, decls + identifers --- */ 481 482 static void 483 build_selector_table_decl (void) 484 { 485 tree temp; 486 487 build_selector_template (); 488 temp = build_array_type (objc_selector_template, NULL_TREE); 489 490 UOBJC_SELECTOR_TABLE_decl = start_var_decl (temp, "_OBJC_SELECTOR_TABLE"); 491 OBJCMETA (UOBJC_SELECTOR_TABLE_decl, objc_meta, meta_base); 492 } 493 494 495 static tree 496 gnu_runtime_abi_01_super_superclassfield_id (void) 497 { 498 if (!super_superclassfield_id) 499 super_superclassfield_id = get_identifier ("super_class"); 500 return super_superclassfield_id; 501 } 502 503 504 static tree 505 gnu_runtime_abi_01_class_decl (tree klass) 506 { 507 tree decl; 508 char buf[BUFSIZE]; 509 snprintf (buf, BUFSIZE, "_OBJC_Class_%s", 510 IDENTIFIER_POINTER (CLASS_NAME (klass))); 511 decl = start_var_decl (objc_class_template, buf); 512 OBJCMETA (decl, objc_meta, meta_base); 513 return decl; 514 } 515 516 static tree 517 gnu_runtime_abi_01_metaclass_decl (tree klass) 518 { 519 tree decl; 520 char buf[BUFSIZE]; 521 snprintf (buf, BUFSIZE, "_OBJC_MetaClass_%s", 522 IDENTIFIER_POINTER (CLASS_NAME (klass))); 523 decl = start_var_decl (objc_class_template, buf); 524 OBJCMETA (decl, objc_meta, meta_base); 525 return decl; 526 } 527 528 static tree 529 gnu_runtime_abi_01_category_decl (tree klass) 530 { 531 tree decl; 532 char buf[BUFSIZE]; 533 snprintf (buf, BUFSIZE, "_OBJC_Category_%s_on_%s", 534 IDENTIFIER_POINTER (CLASS_SUPER_NAME (klass)), 535 IDENTIFIER_POINTER (CLASS_NAME (klass))); 536 decl = start_var_decl (objc_category_template, buf); 537 OBJCMETA (decl, objc_meta, meta_base); 538 return decl; 539 } 540 541 static tree 542 gnu_runtime_abi_01_protocol_decl (tree p) 543 { 544 tree decl; 545 char buf[BUFSIZE]; 546 547 /* static struct _objc_protocol _OBJC_Protocol_<mumble>; */ 548 snprintf (buf, BUFSIZE, "_OBJC_Protocol_%s", 549 IDENTIFIER_POINTER (PROTOCOL_NAME (p))); 550 decl = start_var_decl (objc_protocol_template, buf); 551 OBJCMETA (decl, objc_meta, meta_base); 552 return decl; 553 } 554 555 static tree 556 gnu_runtime_abi_01_string_decl (tree type, const char *name, 557 string_section where ATTRIBUTE_UNUSED) 558 { 559 tree decl = start_var_decl (type, name); 560 OBJCMETA (decl, objc_meta, meta_base); 561 return decl; 562 } 563 564 /* --- entry --- */ 565 566 static tree 567 gnu_runtime_abi_01_get_class_reference (tree ident) 568 { 569 tree params; 570 571 add_class_reference (ident); 572 573 params = build_tree_list (NULL_TREE, my_build_string_pointer 574 (IDENTIFIER_LENGTH (ident) + 1, 575 IDENTIFIER_POINTER (ident))); 576 577 /* FIXME: Do we need this assemble_external() ? */ 578 /* assemble_external (objc_get_class_decl);*/ 579 return build_function_call (input_location, objc_get_class_decl, params); 580 } 581 582 /* Used by build_function_type_for_method. Append the types for 583 receiver & _cmd at the start of a method argument list to ARGTYPES. 584 CONTEXT is either METHOD_DEF or METHOD_REF, saying whether we are 585 trying to define a method or call one. SUPERFLAG says this is for a 586 send to super. METH may be NULL, in the case that there is no 587 prototype. */ 588 589 static void 590 gnu_runtime_abi_01_get_arg_type_list_base (VEC(tree,gc) **argtypes, tree meth, 591 int context, 592 int superflag ATTRIBUTE_UNUSED) 593 { 594 tree receiver_type; 595 596 if (context == METHOD_DEF && TREE_CODE (meth) == INSTANCE_METHOD_DECL) 597 receiver_type = objc_instance_type; 598 else 599 receiver_type = objc_object_type; 600 601 VEC_safe_push (tree, gc, *argtypes, receiver_type); 602 /* Selector type - will eventually change to `int'. */ 603 VEC_safe_push (tree, gc, *argtypes, objc_selector_type); 604 } 605 606 /* Unused for GNU runtime. */ 607 static tree 608 gnu_runtime_abi_01_receiver_is_class_object (tree a ATTRIBUTE_UNUSED) 609 { 610 return NULL_TREE; 611 } 612 613 /* sel_ref_chain is a list whose "value" fields will be instances of 614 identifier_node that represent the selector. LOC is the location of 615 the @selector. */ 616 617 static tree 618 gnu_runtime_abi_01_build_typed_selector_reference (location_t loc, tree ident, 619 tree prototype) 620 { 621 tree *chain = &sel_ref_chain; 622 tree expr; 623 int index = 0; 624 625 while (*chain) 626 { 627 /* When we do a lookup for @selector () we have no idea of the 628 prototype - so match the first we find. */ 629 if (TREE_VALUE (*chain) == ident 630 && (!prototype || TREE_PURPOSE (*chain) == prototype)) 631 goto return_at_index; 632 633 index++; 634 chain = &TREE_CHAIN (*chain); 635 } 636 637 *chain = tree_cons (prototype, ident, NULL_TREE); 638 639 /* TODO: Use a vec and keep this in it to (a) avoid re-creating and 640 (b) provide better diagnostics for the first time an undefined 641 selector is used. */ 642 return_at_index: 643 expr = build_unary_op (loc, ADDR_EXPR, 644 build_array_ref (loc, UOBJC_SELECTOR_TABLE_decl, 645 build_int_cst (NULL_TREE, index)), 646 1); 647 return convert (objc_selector_type, expr); 648 } 649 650 /* Build a tree expression to send OBJECT the operation SELECTOR, 651 looking up the method on object LOOKUP_OBJECT (often same as OBJECT), 652 assuming the method has prototype METHOD_PROTOTYPE. 653 (That is an INSTANCE_METHOD_DECL or CLASS_METHOD_DECL.) 654 LOC is the location of the expression to build. 655 Use METHOD_PARAMS as list of args to pass to the method. 656 If SUPER_FLAG is nonzero, we look up the superclass's method. */ 657 658 static tree 659 build_objc_method_call (location_t loc, int super_flag, tree method_prototype, 660 tree lookup_object, tree selector, 661 tree method_params) 662 { 663 tree sender = (super_flag ? umsg_super_decl 664 : (flag_objc_direct_dispatch ? umsg_fast_decl 665 : umsg_decl)); 666 tree rcv_p = (super_flag ? objc_super_type : objc_object_type); 667 VEC(tree, gc) *parms; 668 VEC(tree, gc) *tv; 669 unsigned nparm = (method_params ? list_length (method_params) : 0); 670 671 /* If a prototype for the method to be called exists, then cast 672 the sender's return type and arguments to match that of the method. 673 Otherwise, leave sender as is. */ 674 tree ret_type 675 = (method_prototype 676 ? TREE_VALUE (TREE_TYPE (method_prototype)) 677 : objc_object_type); 678 tree ftype 679 = build_function_type_for_method (ret_type, method_prototype, 680 METHOD_REF, super_flag); 681 tree sender_cast; 682 tree method, t; 683 684 if (method_prototype && METHOD_TYPE_ATTRIBUTES (method_prototype)) 685 ftype = build_type_attribute_variant (ftype, 686 METHOD_TYPE_ATTRIBUTES 687 (method_prototype)); 688 689 sender_cast = build_pointer_type (ftype); 690 691 lookup_object = build_c_cast (loc, rcv_p, lookup_object); 692 693 /* Use SAVE_EXPR to avoid evaluating the receiver twice. */ 694 lookup_object = save_expr (lookup_object); 695 696 /* Param list + 2 slots for object and selector. */ 697 parms = VEC_alloc (tree, gc, nparm + 2); 698 tv = VEC_alloc (tree, gc, 2); 699 700 /* First, call the lookup function to get a pointer to the method, 701 then cast the pointer, then call it with the method arguments. */ 702 VEC_quick_push (tree, tv, lookup_object); 703 VEC_quick_push (tree, tv, selector); 704 method = build_function_call_vec (loc, sender, tv, NULL); 705 VEC_free (tree, gc, tv); 706 707 /* Pass the appropriate object to the method. */ 708 VEC_quick_push (tree, parms, (super_flag ? self_decl : lookup_object)); 709 710 /* Pass the selector to the method. */ 711 VEC_quick_push (tree, parms, selector); 712 /* Now append the remainder of the parms. */ 713 if (nparm) 714 for (; method_params; method_params = TREE_CHAIN (method_params)) 715 VEC_quick_push (tree, parms, TREE_VALUE (method_params)); 716 717 /* Build an obj_type_ref, with the correct cast for the method call. */ 718 t = build3 (OBJ_TYPE_REF, sender_cast, method, lookup_object, size_zero_node); 719 t = build_function_call_vec (loc, t, parms, NULL); 720 VEC_free (tree, gc, parms); 721 return t; 722 } 723 724 static tree 725 gnu_runtime_abi_01_build_objc_method_call (location_t loc, 726 tree method_prototype, 727 tree receiver, 728 tree rtype ATTRIBUTE_UNUSED, 729 tree sel_name, 730 tree method_params, 731 int super ATTRIBUTE_UNUSED) 732 { 733 tree selector = 734 gnu_runtime_abi_01_build_typed_selector_reference (loc, 735 sel_name, 736 method_prototype); 737 738 return build_objc_method_call (loc, super, method_prototype, receiver, 739 selector, method_params); 740 } 741 742 static tree 743 gnu_runtime_abi_01_get_protocol_reference (location_t loc, tree p) 744 { 745 tree expr, protocol_struct_type, *chain; 746 if (!PROTOCOL_FORWARD_DECL (p)) 747 PROTOCOL_FORWARD_DECL (p) = gnu_runtime_abi_01_protocol_decl (p); 748 749 expr = build_unary_op (loc, ADDR_EXPR, PROTOCOL_FORWARD_DECL (p), 0); 750 751 /* ??? Ideally we'd build the reference with objc_protocol_type directly, 752 if we have it, rather than converting it here. */ 753 expr = convert (objc_protocol_type, expr); 754 755 /* The @protocol() expression is being compiled into a pointer to a 756 statically allocated instance of the Protocol class. To become 757 usable at runtime, the 'isa' pointer of the instance need to be 758 fixed up at runtime by the runtime library, to point to the 759 actual 'Protocol' class. */ 760 761 /* For the GNU runtime, put the static Protocol instance in the list 762 of statically allocated instances, so that we make sure that its 763 'isa' pointer is fixed up at runtime by the GNU runtime library 764 to point to the Protocol class (at runtime, when loading the 765 module, the GNU runtime library loops on the statically allocated 766 instances (as found in the defs field in objc_symtab) and fixups 767 all the 'isa' pointers of those objects). */ 768 769 /* This type is a struct containing the fields of a Protocol 770 object. (Cfr. objc_protocol_type instead is the type of a pointer 771 to such a struct). */ 772 protocol_struct_type = xref_tag (RECORD_TYPE, 773 get_identifier (PROTOCOL_OBJECT_CLASS_NAME)); 774 775 /* Look for the list of Protocol statically allocated instances 776 to fixup at runtime. Create a new list to hold Protocol 777 statically allocated instances, if the list is not found. At 778 present there is only another list, holding NSConstantString 779 static instances to be fixed up at runtime. */ 780 781 for (chain = &objc_static_instances; 782 *chain && TREE_VALUE (*chain) != protocol_struct_type; 783 chain = &TREE_CHAIN (*chain)); 784 785 if (!*chain) 786 { 787 *chain = tree_cons (NULL_TREE, protocol_struct_type, NULL_TREE); 788 add_objc_string (OBJC_TYPE_NAME (protocol_struct_type), 789 class_names); 790 } 791 792 /* Add this statically allocated instance to the Protocol list. */ 793 TREE_PURPOSE (*chain) = tree_cons (NULL_TREE, 794 PROTOCOL_FORWARD_DECL (p), 795 TREE_PURPOSE (*chain)); 796 return expr; 797 } 798 799 /* For ABI 8 an IVAR is just a fixed offset in the class struct. */ 800 801 static tree 802 gnu_runtime_abi_01_build_ivar_ref (location_t loc ATTRIBUTE_UNUSED, 803 tree base, tree id) 804 { 805 return objc_build_component_ref (base, id); 806 } 807 808 /* We build super class references as we need them (but keep them once 809 built for the sake of efficiency). */ 810 811 static tree 812 gnu_runtime_abi_01_get_class_super_ref (location_t loc ATTRIBUTE_UNUSED, 813 struct imp_entry *imp, bool inst_meth) 814 { 815 if (inst_meth) 816 { 817 if (!ucls_super_ref) 818 ucls_super_ref = 819 objc_build_component_ref (imp->class_decl, 820 get_identifier ("super_class")); 821 return ucls_super_ref; 822 } 823 else 824 { 825 if (!uucls_super_ref) 826 uucls_super_ref = 827 objc_build_component_ref (imp->meta_decl, 828 get_identifier ("super_class")); 829 return uucls_super_ref; 830 } 831 } 832 833 static tree 834 gnu_runtime_abi_01_get_category_super_ref (location_t loc ATTRIBUTE_UNUSED, 835 struct imp_entry *imp, bool inst_meth) 836 { 837 tree super_name = CLASS_SUPER_NAME (imp->imp_template); 838 tree super_class; 839 840 add_class_reference (super_name); 841 super_class = (inst_meth ? objc_get_class_decl : objc_get_meta_class_decl); 842 /* FIXME: Do we need this assemble_external() ? */ 843 /* assemble_external (super_class);*/ 844 super_name = my_build_string_pointer (IDENTIFIER_LENGTH (super_name) + 1, 845 IDENTIFIER_POINTER (super_name)); 846 /* super_class = get_{meta_}class("CLASS_SUPER_NAME"); */ 847 return build_function_call (input_location, 848 super_class, 849 build_tree_list (NULL_TREE, super_name)); 850 } 851 852 static bool 853 gnu_runtime_abi_01_setup_const_string_class_decl (void) 854 { 855 /* Do nothing, and create no error. */ 856 return true; 857 } 858 859 /* Declare a static instance of CLASS_DECL initialized by CONSTRUCTOR. */ 860 861 static GTY(()) int num_static_inst; 862 863 static tree 864 objc_add_static_instance (tree constructor, tree class_decl) 865 { 866 tree *chain, decl; 867 char buf[BUFSIZE]; 868 869 /* Find the list of static instances for the CLASS_DECL. Create one if 870 not found. */ 871 for (chain = &objc_static_instances; 872 *chain && TREE_VALUE (*chain) != class_decl; 873 chain = &TREE_CHAIN (*chain)); 874 if (!*chain) 875 { 876 *chain = tree_cons (NULL_TREE, class_decl, NULL_TREE); 877 add_objc_string (OBJC_TYPE_NAME (class_decl), class_names); 878 } 879 880 snprintf (buf, BUFSIZE, "_OBJC_INSTANCE_%d", num_static_inst++); 881 decl = build_decl (input_location, 882 VAR_DECL, get_identifier (buf), class_decl); 883 TREE_STATIC (decl) = 1; 884 DECL_ARTIFICIAL (decl) = 1; 885 TREE_USED (decl) = 1; 886 DECL_INITIAL (decl) = constructor; 887 DECL_CONTEXT (decl) = NULL; 888 OBJCMETA (decl, objc_meta, meta_base); 889 890 /* We may be writing something else just now. 891 Postpone till end of input. */ 892 DECL_DEFER_OUTPUT (decl) = 1; 893 pushdecl_top_level (decl); 894 rest_of_decl_compilation (decl, 1, 0); 895 896 /* Add the DECL to the head of this CLASS' list. */ 897 TREE_PURPOSE (*chain) = tree_cons (NULL_TREE, decl, TREE_PURPOSE (*chain)); 898 899 return decl; 900 } 901 902 static tree 903 gnu_runtime_abi_01_build_const_string_constructor (location_t loc, tree string, 904 int length) 905 { 906 tree constructor, fields; 907 VEC(constructor_elt,gc) *v = NULL; 908 909 /* GNU: (NXConstantString *) & ((__builtin_ObjCString) { NULL, string, length }) */ 910 fields = TYPE_FIELDS (internal_const_str_type); 911 CONSTRUCTOR_APPEND_ELT (v, fields, build_int_cst (NULL_TREE, 0)); 912 913 fields = DECL_CHAIN (fields); 914 CONSTRUCTOR_APPEND_ELT (v, fields, build_unary_op (loc, 915 ADDR_EXPR, string, 1)); 916 917 fields = DECL_CHAIN (fields); 918 CONSTRUCTOR_APPEND_ELT (v, fields, build_int_cst (NULL_TREE, length)); 919 constructor = objc_build_constructor (internal_const_str_type, v); 920 921 constructor = objc_add_static_instance (constructor, constant_string_type); 922 return constructor; 923 } 924 925 /* --- metadata - module initializer --- */ 926 927 /* The GNU runtime requires us to provide a static initializer function 928 for each module: 929 930 static void __objc_gnu_init (void) { 931 __objc_exec_class (&L_OBJC_MODULES); 932 } */ 933 934 935 static void 936 build_module_initializer_routine (void) 937 { 938 tree body; 939 940 #ifdef OBJCPLUS 941 push_lang_context (lang_name_c); /* extern "C" */ 942 #endif 943 944 objc_push_parm (build_decl (input_location, 945 PARM_DECL, NULL_TREE, void_type_node)); 946 #ifdef OBJCPLUS 947 objc_start_function (get_identifier (TAG_GNUINIT), 948 build_function_type_list (void_type_node, NULL_TREE), 949 NULL_TREE, NULL_TREE); 950 #else 951 objc_start_function (get_identifier (TAG_GNUINIT), 952 build_function_type_list (void_type_node, NULL_TREE), 953 NULL_TREE, objc_get_parm_info (0, NULL_TREE)); 954 #endif 955 body = c_begin_compound_stmt (true); 956 add_stmt (build_function_call 957 (input_location, 958 execclass_decl, 959 build_tree_list 960 (NULL_TREE, 961 build_unary_op (input_location, ADDR_EXPR, 962 UOBJC_MODULES_decl, 0)))); 963 add_stmt (c_end_compound_stmt (input_location, body, true)); 964 965 TREE_PUBLIC (current_function_decl) = 0; 966 967 #ifndef OBJCPLUS 968 /* For Objective-C++, we will need to call __objc_gnu_init 969 from objc_generate_static_init_call() below. */ 970 DECL_STATIC_CONSTRUCTOR (current_function_decl) = 1; 971 #endif 972 973 GNU_INIT_decl = current_function_decl; 974 finish_function (); 975 976 #ifdef OBJCPLUS 977 pop_lang_context (); 978 #endif 979 } 980 981 #ifdef OBJCPLUS 982 /* Return 1 if the __objc_gnu_init function has been synthesized and needs 983 to be called by the module initializer routine. */ 984 985 int 986 objc_static_init_needed_p (void) 987 { 988 return (GNU_INIT_decl != NULL_TREE); 989 } 990 991 /* Generate a call to the __objc_gnu_init initializer function. */ 992 993 tree 994 objc_generate_static_init_call (tree ctors ATTRIBUTE_UNUSED) 995 { 996 add_stmt (build_stmt (input_location, EXPR_STMT, 997 build_function_call (input_location, 998 GNU_INIT_decl, NULL_TREE))); 999 1000 return ctors; 1001 } 1002 #endif /* OBJCPLUS */ 1003 1004 /* --- Output GNU Meta-data --- */ 1005 1006 static void 1007 generate_classref_translation_entry (tree chain) 1008 { 1009 tree expr, decl, type; 1010 1011 decl = TREE_PURPOSE (chain); 1012 type = TREE_TYPE (decl); 1013 1014 expr = add_objc_string (TREE_VALUE (chain), class_names); 1015 expr = convert (type, expr); /* cast! */ 1016 1017 /* This is a class reference. It is re-written by the runtime, 1018 but will be optimized away unless we force it. */ 1019 DECL_PRESERVE_P (decl) = 1; 1020 OBJCMETA (decl, objc_meta, meta_base); 1021 finish_var_decl (decl, expr); 1022 return; 1023 } 1024 1025 1026 static void 1027 handle_impent (struct imp_entry *impent) 1028 { 1029 char *string; 1030 1031 /* objc_implementation_context = impent->imp_context; 1032 implementation_template = impent->imp_template;*/ 1033 1034 switch (TREE_CODE (impent->imp_context)) 1035 { 1036 case CLASS_IMPLEMENTATION_TYPE: 1037 { 1038 const char *const class_name = 1039 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context)); 1040 1041 string = (char *) alloca (strlen (class_name) + 30); 1042 1043 sprintf (string, "__objc_class_name_%s", class_name); 1044 break; 1045 } 1046 case CATEGORY_IMPLEMENTATION_TYPE: 1047 { 1048 const char *const class_name = 1049 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context)); 1050 const char *const class_super_name = 1051 IDENTIFIER_POINTER (CLASS_SUPER_NAME (impent->imp_context)); 1052 1053 string = (char *) alloca (strlen (class_name) 1054 + strlen (class_super_name) + 30); 1055 1056 /* Do the same for categories. Even though no references to 1057 these symbols are generated automatically by the compiler, 1058 it gives you a handle to pull them into an archive by 1059 hand. */ 1060 sprintf (string, "*__objc_category_name_%s_%s", class_name, class_super_name); 1061 break; 1062 } 1063 default: 1064 return; 1065 } 1066 1067 { 1068 tree decl, init; 1069 1070 init = integer_zero_node; 1071 decl = build_decl (input_location, 1072 VAR_DECL, get_identifier (string), TREE_TYPE (init)); 1073 TREE_PUBLIC (decl) = 1; 1074 TREE_READONLY (decl) = 1; 1075 TREE_USED (decl) = 1; 1076 TREE_CONSTANT (decl) = 1; 1077 DECL_CONTEXT (decl) = NULL_TREE; 1078 DECL_ARTIFICIAL (decl) = 1; 1079 TREE_STATIC (decl) = 1; 1080 DECL_INITIAL (decl) = error_mark_node; /* A real initializer is coming... */ 1081 /* We must force the reference. */ 1082 DECL_PRESERVE_P (decl) = 1; 1083 1084 finish_var_decl(decl, init) ; 1085 } 1086 } 1087 1088 tree 1089 build_protocol_initializer (tree type, tree protocol_name, tree protocol_list, 1090 tree inst_methods, tree class_methods) 1091 { 1092 tree expr, ttyp; 1093 location_t loc; 1094 VEC(constructor_elt,gc) *inits = NULL; 1095 1096 /* TODO: pass the loc in or find it from args. */ 1097 loc = input_location; 1098 ttyp = build_pointer_type (xref_tag (RECORD_TYPE, 1099 get_identifier (UTAG_CLASS))); 1100 /* Filling the "isa" in with a version allows the runtime system to 1101 detect this ... */ 1102 expr = build_int_cst (ttyp, PROTOCOL_VERSION); 1103 1104 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, expr); 1105 1106 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, protocol_name); 1107 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, protocol_list); 1108 1109 ttyp = objc_method_proto_list_ptr; 1110 if (inst_methods) 1111 expr = convert (ttyp, build_unary_op (loc, ADDR_EXPR, inst_methods, 0)); 1112 else 1113 expr = convert (ttyp, null_pointer_node); 1114 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, expr); 1115 1116 if (class_methods) 1117 expr = convert (ttyp, build_unary_op (loc, ADDR_EXPR, class_methods, 0)); 1118 else 1119 expr = convert (ttyp, null_pointer_node); 1120 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, expr); 1121 1122 return objc_build_constructor (type, inits); 1123 } 1124 1125 static tree 1126 generate_protocol_list (tree i_or_p, tree klass_ctxt) 1127 { 1128 tree array_type, ptype, refs_decl, lproto, e, plist; 1129 VEC(constructor_elt,gc) *v = NULL; 1130 char buf[BUFSIZE]; 1131 int size = 0; 1132 1133 switch (TREE_CODE (i_or_p)) 1134 { 1135 case CLASS_INTERFACE_TYPE: 1136 case CATEGORY_INTERFACE_TYPE: 1137 plist = CLASS_PROTOCOL_LIST (i_or_p); 1138 break; 1139 case PROTOCOL_INTERFACE_TYPE: 1140 plist = PROTOCOL_LIST (i_or_p); 1141 break; 1142 default: 1143 gcc_unreachable (); 1144 } 1145 1146 /* Compute size. */ 1147 for (lproto = plist; lproto; lproto = TREE_CHAIN (lproto)) 1148 if (TREE_CODE (TREE_VALUE (lproto)) == PROTOCOL_INTERFACE_TYPE 1149 && PROTOCOL_FORWARD_DECL (TREE_VALUE (lproto))) 1150 size++; 1151 1152 /* Build initializer. */ 1153 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1154 e = build_int_cst (build_pointer_type (objc_protocol_template), size); 1155 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, e); 1156 1157 for (lproto = plist; lproto; lproto = TREE_CHAIN (lproto)) 1158 { 1159 tree pval = TREE_VALUE (lproto); 1160 1161 if (TREE_CODE (pval) == PROTOCOL_INTERFACE_TYPE 1162 && PROTOCOL_FORWARD_DECL (pval)) 1163 { 1164 tree fwref = PROTOCOL_FORWARD_DECL (pval); 1165 location_t loc = DECL_SOURCE_LOCATION (fwref) ; 1166 e = build_unary_op (loc, ADDR_EXPR, fwref, 0); 1167 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, e); 1168 } 1169 } 1170 1171 /* static struct objc_protocol *refs[n]; */ 1172 1173 switch (TREE_CODE (i_or_p)) 1174 { 1175 case PROTOCOL_INTERFACE_TYPE: 1176 snprintf (buf, BUFSIZE, "_OBJC_ProtocolRefs_%s", 1177 IDENTIFIER_POINTER (PROTOCOL_NAME (i_or_p))); 1178 break; 1179 case CLASS_INTERFACE_TYPE: 1180 snprintf (buf, BUFSIZE, "_OBJC_ClassProtocols_%s", 1181 IDENTIFIER_POINTER (CLASS_NAME (i_or_p))); 1182 break; 1183 case CATEGORY_INTERFACE_TYPE: 1184 snprintf (buf, BUFSIZE, "_OBJC_CategoryProtocols_%s_%s", 1185 IDENTIFIER_POINTER (CLASS_NAME (klass_ctxt)), 1186 IDENTIFIER_POINTER (CLASS_SUPER_NAME (klass_ctxt))); 1187 break; 1188 default: 1189 gcc_unreachable (); 1190 } 1191 1192 ptype = build_pointer_type (objc_protocol_template); 1193 array_type = build_sized_array_type (ptype, size + 3); 1194 refs_decl = start_var_decl (array_type, buf); 1195 OBJCMETA (refs_decl, objc_meta, meta_base); 1196 finish_var_decl (refs_decl, 1197 objc_build_constructor (TREE_TYPE (refs_decl), v)); 1198 1199 return refs_decl; 1200 } 1201 1202 static tree 1203 generate_v1_meth_descriptor_table (tree chain, tree protocol, const char *prefix) 1204 { 1205 tree method_list_template, initlist, decl; 1206 int size; 1207 VEC(constructor_elt,gc) *v = NULL; 1208 char buf[BUFSIZE]; 1209 1210 if (!chain || !prefix) 1211 return NULL_TREE; 1212 1213 if (!objc_method_prototype_template) 1214 objc_method_prototype_template = build_method_prototype_template (); 1215 1216 size = list_length (chain); 1217 method_list_template = 1218 build_method_prototype_list_template (objc_method_prototype_template, 1219 size); 1220 snprintf (buf, BUFSIZE, "%s_%s", prefix, 1221 IDENTIFIER_POINTER (PROTOCOL_NAME (protocol))); 1222 1223 decl = start_var_decl (method_list_template, buf); 1224 1225 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, size)); 1226 initlist = 1227 build_descriptor_table_initializer (objc_method_prototype_template, 1228 chain); 1229 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, initlist); 1230 OBJCMETA (decl, objc_meta, meta_base); 1231 finish_var_decl (decl, objc_build_constructor (method_list_template, v)); 1232 return decl; 1233 } 1234 1235 /* For each protocol which was referenced either from a @protocol() 1236 expression, or because a class/category implements it (then a 1237 pointer to the protocol is stored in the struct describing the 1238 class/category), we create a statically allocated instance of the 1239 Protocol class. The code is written in such a way as to generate 1240 as few Protocol objects as possible; we generate a unique Protocol 1241 instance for each protocol, and we don't generate a Protocol 1242 instance if the protocol is never referenced (either from a 1243 @protocol() or from a class/category implementation). These 1244 statically allocated objects can be referred to via the static 1245 (that is, private to this module) symbols _OBJC_PROTOCOL_n. 1246 1247 The statically allocated Protocol objects that we generate here 1248 need to be fixed up at runtime in order to be used: the 'isa' 1249 pointer of the objects need to be set up to point to the 'Protocol' 1250 class, as known at runtime. 1251 1252 The GNU runtime fixes up all protocols before user code from the module 1253 is executed; it requires pointers to those symbols 1254 to be put in the objc_symtab (which is then passed as argument to 1255 the function __objc_exec_class() which the compiler sets up to be 1256 executed automatically when the module is loaded); setup of those 1257 Protocol objects happen in two ways in the GNU runtime: all 1258 Protocol objects referred to by a class or category implementation 1259 are fixed up when the class/category is loaded; all Protocol 1260 objects referred to by a @protocol() expression are added by the 1261 compiler to the list of statically allocated instances to fixup 1262 (the same list holding the statically allocated constant string 1263 objects). Because, as explained above, the compiler generates as 1264 few Protocol objects as possible, some Protocol object might end up 1265 being referenced multiple times when compiled with the GNU runtime, 1266 and end up being fixed up multiple times at runtime initialization. 1267 But that doesn't hurt, it's just a little inefficient. */ 1268 1269 static void 1270 generate_protocols (void) 1271 { 1272 tree p, encoding; 1273 tree decl; 1274 tree initlist, protocol_name_expr, refs_decl, refs_expr; 1275 1276 /* If a protocol was directly referenced, pull in indirect references. */ 1277 for (p = protocol_chain; p; p = TREE_CHAIN (p)) 1278 if (PROTOCOL_FORWARD_DECL (p) && PROTOCOL_LIST (p)) 1279 generate_protocol_references (PROTOCOL_LIST (p)); 1280 1281 for (p = protocol_chain; p; p = TREE_CHAIN (p)) 1282 { 1283 tree nst_methods = PROTOCOL_NST_METHODS (p); 1284 tree cls_methods = PROTOCOL_CLS_METHODS (p); 1285 1286 /* If protocol wasn't referenced, don't generate any code. */ 1287 decl = PROTOCOL_FORWARD_DECL (p); 1288 1289 if (!decl) 1290 continue; 1291 1292 /* Make sure we link in the Protocol class. */ 1293 add_class_reference (get_identifier (PROTOCOL_OBJECT_CLASS_NAME)); 1294 1295 while (nst_methods) 1296 { 1297 if (! METHOD_ENCODING (nst_methods)) 1298 { 1299 encoding = encode_method_prototype (nst_methods); 1300 METHOD_ENCODING (nst_methods) = encoding; 1301 } 1302 nst_methods = DECL_CHAIN (nst_methods); 1303 } 1304 1305 UOBJC_INSTANCE_METHODS_decl = 1306 generate_v1_meth_descriptor_table (PROTOCOL_NST_METHODS (p), p, 1307 "_OBJC_PROTOCOL_INSTANCE_METHODS"); 1308 1309 while (cls_methods) 1310 { 1311 if (! METHOD_ENCODING (cls_methods)) 1312 { 1313 encoding = encode_method_prototype (cls_methods); 1314 METHOD_ENCODING (cls_methods) = encoding; 1315 } 1316 1317 cls_methods = DECL_CHAIN (cls_methods); 1318 } 1319 1320 UOBJC_CLASS_METHODS_decl = 1321 generate_v1_meth_descriptor_table (PROTOCOL_CLS_METHODS (p), p, 1322 "_OBJC_PROTOCOL_CLASS_METHODS"); 1323 /* generate_method_descriptors (p);*/ 1324 1325 if (PROTOCOL_LIST (p)) 1326 refs_decl = generate_protocol_list (p, NULL_TREE); 1327 else 1328 refs_decl = 0; 1329 1330 /* static struct objc_protocol _OBJC_PROTOCOL_<mumble>; */ 1331 protocol_name_expr = add_objc_string (PROTOCOL_NAME (p), class_names); 1332 1333 if (refs_decl) 1334 refs_expr = convert (build_pointer_type (build_pointer_type 1335 (objc_protocol_template)), 1336 build_unary_op (input_location, 1337 ADDR_EXPR, refs_decl, 0)); 1338 else 1339 refs_expr = build_int_cst (NULL_TREE, 0); 1340 1341 /* UOBJC_INSTANCE_METHODS_decl/UOBJC_CLASS_METHODS_decl are set 1342 by generate_method_descriptors, which is called above. */ 1343 initlist = build_protocol_initializer (TREE_TYPE (decl), 1344 protocol_name_expr, refs_expr, 1345 UOBJC_INSTANCE_METHODS_decl, 1346 UOBJC_CLASS_METHODS_decl); 1347 finish_var_decl (decl, initlist); 1348 } 1349 } 1350 1351 static tree 1352 generate_dispatch_table (tree chain, const char *name) 1353 { 1354 tree decl, method_list_template, initlist; 1355 VEC(constructor_elt,gc) *v = NULL; 1356 int size = list_length (chain); 1357 1358 if (!objc_method_template) 1359 objc_method_template = build_method_template (); 1360 1361 method_list_template = build_method_list_template (objc_method_template, 1362 size); 1363 initlist = build_dispatch_table_initializer (objc_method_template, chain); 1364 1365 decl = start_var_decl (method_list_template, name); 1366 1367 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, integer_zero_node); 1368 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1369 build_int_cst (integer_type_node, size)); 1370 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, initlist); 1371 1372 OBJCMETA (decl, objc_meta, meta_base); 1373 finish_var_decl (decl, 1374 objc_build_constructor (TREE_TYPE (decl), v)); 1375 1376 return decl; 1377 } 1378 1379 /* Init a category. */ 1380 static tree 1381 build_category_initializer (tree type, tree cat_name, tree class_name, 1382 tree inst_methods, tree class_methods, 1383 tree protocol_list) 1384 { 1385 tree expr, ltyp; 1386 location_t loc; 1387 VEC(constructor_elt,gc) *v = NULL; 1388 1389 /* TODO: pass the loc in or find it from args. */ 1390 /* TODO: pass the loc in or find it from args. */ 1391 loc = UNKNOWN_LOCATION; 1392 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, cat_name); 1393 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, class_name); 1394 1395 ltyp = objc_method_list_ptr; 1396 if (inst_methods) 1397 expr = convert (ltyp, build_unary_op (loc, ADDR_EXPR, inst_methods, 0)); 1398 else 1399 expr = convert (ltyp, null_pointer_node); 1400 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1401 1402 if (class_methods) 1403 expr = convert (ltyp, build_unary_op (loc, ADDR_EXPR, class_methods, 0)); 1404 else 1405 expr = convert (ltyp, null_pointer_node); 1406 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1407 1408 /* protocol_list = */ 1409 ltyp = build_pointer_type (build_pointer_type (objc_protocol_template)); 1410 if (protocol_list) 1411 expr = convert (ltyp, build_unary_op (loc, ADDR_EXPR, protocol_list, 0)); 1412 else 1413 expr = convert (ltyp, null_pointer_node); 1414 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1415 1416 return objc_build_constructor (type, v); 1417 } 1418 1419 /* static struct objc_category _OBJC_CATEGORY_<name> = { ... }; */ 1420 1421 static void 1422 generate_category (struct imp_entry *impent) 1423 { 1424 tree initlist, cat_name_expr, class_name_expr; 1425 tree protocol_decl, category, cat_decl; 1426 tree inst_methods = NULL_TREE, class_methods = NULL_TREE; 1427 tree cat = impent->imp_context; 1428 char buf[BUFSIZE]; 1429 1430 cat_decl = impent->class_decl; 1431 1432 add_class_reference (CLASS_NAME (cat)); 1433 cat_name_expr = add_objc_string (CLASS_SUPER_NAME (cat), class_names); 1434 1435 class_name_expr = add_objc_string (CLASS_NAME (cat), class_names); 1436 1437 category = lookup_category (impent->imp_template, CLASS_SUPER_NAME (cat)); 1438 1439 if (category && CLASS_PROTOCOL_LIST (category)) 1440 { 1441 generate_protocol_references (CLASS_PROTOCOL_LIST (category)); 1442 protocol_decl = generate_protocol_list (category, cat); 1443 } 1444 else 1445 protocol_decl = 0; 1446 1447 if (CLASS_NST_METHODS (cat)) 1448 { 1449 snprintf (buf, BUFSIZE, "_OBJC_CategoryInstanceMethods_%s_%s", 1450 IDENTIFIER_POINTER (CLASS_NAME (cat)), 1451 IDENTIFIER_POINTER (CLASS_SUPER_NAME (cat))); 1452 inst_methods = generate_dispatch_table (CLASS_NST_METHODS (cat), buf); 1453 } 1454 1455 if (CLASS_CLS_METHODS (cat)) 1456 { 1457 snprintf (buf, BUFSIZE, "_OBJC_CategoryClassMethods_%s_%s", 1458 IDENTIFIER_POINTER (CLASS_NAME (cat)), 1459 IDENTIFIER_POINTER (CLASS_SUPER_NAME (cat))); 1460 class_methods = generate_dispatch_table (CLASS_CLS_METHODS (cat), buf); 1461 } 1462 1463 initlist = build_category_initializer (TREE_TYPE (cat_decl), 1464 cat_name_expr, class_name_expr, 1465 inst_methods, class_methods, 1466 protocol_decl); 1467 /* Finish and initialize the forward decl. */ 1468 finish_var_decl (cat_decl, initlist); 1469 impent->class_decl = cat_decl; 1470 } 1471 1472 /* struct _objc_class { 1473 struct objc_class *isa; 1474 struct objc_class *super_class; 1475 char *name; 1476 long version; 1477 long info; 1478 long instance_size; 1479 struct objc_ivar_list *ivars; 1480 struct objc_method_list *methods; 1481 struct sarray *dtable; 1482 struct objc_class *subclass_list; 1483 struct objc_class *sibling_class; 1484 struct objc_protocol_list *protocols; 1485 void *gc_object_type; 1486 }; */ 1487 1488 static tree 1489 build_shared_structure_initializer (tree type, tree isa, tree super, 1490 tree name, tree size, int status, 1491 tree dispatch_table, tree ivar_list, 1492 tree protocol_list) 1493 { 1494 tree expr, ltyp; 1495 VEC(constructor_elt,gc) *v = NULL; 1496 1497 /* isa = */ 1498 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, isa); 1499 1500 /* super_class = */ 1501 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, super); 1502 1503 /* name = */ 1504 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, default_conversion (name)); 1505 1506 /* version = */ 1507 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1508 build_int_cst (long_integer_type_node, 0)); 1509 1510 /* info = */ 1511 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1512 build_int_cst (long_integer_type_node, status)); 1513 1514 /* instance_size = */ 1515 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1516 convert (long_integer_type_node, size)); 1517 1518 /* objc_ivar_list = */ 1519 if (!ivar_list) 1520 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1521 build_int_cst (objc_ivar_list_ptr, 0)); 1522 else 1523 { 1524 expr = convert (objc_ivar_list_ptr, 1525 build_unary_op (input_location, ADDR_EXPR, 1526 ivar_list, 0)); 1527 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1528 } 1529 1530 /* objc_method_list = */ 1531 if (!dispatch_table) 1532 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1533 convert (objc_method_list_ptr, null_pointer_node)); 1534 else 1535 { 1536 expr = convert (objc_method_list_ptr, 1537 build_unary_op (input_location, ADDR_EXPR, 1538 dispatch_table, 0)); 1539 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1540 } 1541 1542 /* FIXME: Remove NeXT runtime code. */ 1543 if (flag_next_runtime) 1544 { 1545 ltyp = build_pointer_type (xref_tag (RECORD_TYPE, 1546 get_identifier ("objc_cache"))); 1547 /* method_cache = */ 1548 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, convert (ltyp, null_pointer_node)); 1549 } 1550 else 1551 { 1552 /* dtable = */ 1553 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1554 1555 /* subclass_list = */ 1556 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1557 1558 /* sibling_class = */ 1559 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1560 } 1561 1562 /* protocol_list = */ 1563 ltyp = build_pointer_type (build_pointer_type (objc_protocol_template)); 1564 if (! protocol_list) 1565 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (ltyp, 0)); 1566 else 1567 { 1568 expr = convert (ltyp, 1569 build_unary_op (input_location, ADDR_EXPR, 1570 protocol_list, 0)); 1571 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1572 } 1573 1574 /* FIXME: Remove NeXT runtime code. */ 1575 if (flag_next_runtime) 1576 /* sel_id = NULL */ 1577 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1578 1579 /* gc_object_type = NULL */ 1580 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1581 1582 return objc_build_constructor (type, v); 1583 } 1584 1585 1586 static tree 1587 generate_ivars_list (tree chain, const char *name) 1588 { 1589 tree initlist, ivar_list_template, decl; 1590 int size; 1591 VEC(constructor_elt,gc) *inits = NULL; 1592 1593 if (!chain) 1594 return NULL_TREE; 1595 1596 if (!objc_ivar_template) 1597 objc_ivar_template = build_ivar_template (); 1598 1599 size = ivar_list_length (chain); 1600 1601 generating_instance_variables = 1; 1602 ivar_list_template = build_ivar_list_template (objc_ivar_template, size); 1603 initlist = build_ivar_list_initializer (objc_ivar_template, chain); 1604 generating_instance_variables = 0; 1605 1606 decl = start_var_decl (ivar_list_template, name); 1607 1608 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, build_int_cst (NULL_TREE, size)); 1609 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, initlist); 1610 1611 OBJCMETA (decl, objc_meta, meta_base); 1612 finish_var_decl (decl, 1613 objc_build_constructor (TREE_TYPE (decl), inits)); 1614 1615 return decl; 1616 } 1617 1618 /* static struct objc_class _OBJC_METACLASS_Foo={ ... }; 1619 static struct objc_class _OBJC_CLASS_Foo={ ... }; */ 1620 1621 static void 1622 generate_class_structures (struct imp_entry *impent) 1623 { 1624 tree name_expr, super_expr, root_expr, class_decl, meta_decl; 1625 tree my_root_id, my_super_id; 1626 tree cast_type, initlist, protocol_decl; 1627 tree inst_methods = NULL_TREE, class_methods = NULL_TREE; 1628 tree chain, inst_ivars = NULL_TREE, class_ivars = NULL_TREE; 1629 location_t loc; 1630 char buf[BUFSIZE]; 1631 int cls_flags = 0 ; 1632 1633 /* objc_implementation_context = impent->imp_context; 1634 implementation_template = impent->imp_template;*/ 1635 class_decl = impent->class_decl; 1636 meta_decl = impent->meta_decl; 1637 /* UOBJC_CLASS_decl = impent->class_decl; 1638 UOBJC_METACLASS_decl = impent->meta_decl;*/ 1639 1640 loc = DECL_SOURCE_LOCATION (impent->class_decl); 1641 1642 my_super_id = CLASS_SUPER_NAME (impent->imp_template); 1643 if (my_super_id) 1644 { 1645 add_class_reference (my_super_id); 1646 1647 /* Compute "my_root_id" - this is required for code generation. 1648 the "isa" for all meta class structures points to the root of 1649 the inheritance hierarchy (e.g. "__Object")... */ 1650 my_root_id = my_super_id; 1651 do 1652 { 1653 tree my_root_int = lookup_interface (my_root_id); 1654 1655 if (my_root_int && CLASS_SUPER_NAME (my_root_int)) 1656 my_root_id = CLASS_SUPER_NAME (my_root_int); 1657 else 1658 break; 1659 } 1660 while (1); 1661 } 1662 else 1663 /* No super class. */ 1664 my_root_id = CLASS_NAME (impent->imp_template); 1665 1666 cast_type = build_pointer_type (objc_class_template); 1667 name_expr = add_objc_string (CLASS_NAME (impent->imp_template), 1668 class_names); 1669 1670 /* Install class `isa' and `super' pointers at runtime. */ 1671 if (my_super_id) 1672 super_expr = add_objc_string (my_super_id, class_names); 1673 else 1674 super_expr = null_pointer_node; 1675 1676 super_expr = build_c_cast (loc, cast_type, super_expr); 1677 1678 root_expr = add_objc_string (my_root_id, class_names); 1679 root_expr = build_c_cast (loc, cast_type, root_expr); 1680 1681 if (CLASS_PROTOCOL_LIST (impent->imp_template)) 1682 { 1683 generate_protocol_references (CLASS_PROTOCOL_LIST (impent->imp_template)); 1684 protocol_decl = generate_protocol_list (impent->imp_template, 1685 impent->imp_context); 1686 } 1687 else 1688 protocol_decl = NULL_TREE; 1689 1690 if (CLASS_CLS_METHODS (impent->imp_context)) 1691 { 1692 snprintf (buf, BUFSIZE, "_OBJC_ClassMethods_%s", 1693 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context))); 1694 class_methods = generate_dispatch_table (CLASS_CLS_METHODS (impent->imp_context), 1695 buf); 1696 } 1697 1698 if (CLASS_SUPER_NAME (impent->imp_template) == NULL_TREE 1699 && (chain = TYPE_FIELDS (objc_class_template))) 1700 { 1701 snprintf (buf, BUFSIZE, "_OBJC_ClassIvars_%s", 1702 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context))); 1703 class_ivars = generate_ivars_list (chain, buf); 1704 } 1705 1706 /* static struct objc_class _OBJC_METACLASS_Foo = { ... }; */ 1707 1708 initlist = 1709 build_shared_structure_initializer 1710 (TREE_TYPE (meta_decl), 1711 root_expr, super_expr, name_expr, 1712 convert (integer_type_node, 1713 TYPE_SIZE_UNIT (objc_class_template)), 1714 CLS_META, class_methods, class_ivars, 1715 protocol_decl); 1716 1717 finish_var_decl (meta_decl, initlist); 1718 impent->meta_decl = meta_decl; 1719 1720 /* static struct objc_class _OBJC_CLASS_Foo={ ... }; */ 1721 if (CLASS_NST_METHODS (impent->imp_context)) 1722 { 1723 snprintf (buf, BUFSIZE, "_OBJC_InstanceMethods_%s", 1724 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context))); 1725 inst_methods = generate_dispatch_table (CLASS_NST_METHODS (impent->imp_context), 1726 buf); 1727 } 1728 1729 if ((chain = CLASS_IVARS (impent->imp_template))) 1730 { 1731 snprintf (buf, BUFSIZE, "_OBJC_InstanceIvars_%s", 1732 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context))); 1733 inst_ivars = generate_ivars_list (chain, buf); 1734 } 1735 1736 initlist = 1737 build_shared_structure_initializer 1738 (TREE_TYPE (class_decl), 1739 build_unary_op (loc, ADDR_EXPR, meta_decl, 0), 1740 super_expr, name_expr, 1741 convert (integer_type_node, 1742 TYPE_SIZE_UNIT (CLASS_STATIC_TEMPLATE 1743 (impent->imp_template))), 1744 CLS_FACTORY | cls_flags, inst_methods, inst_ivars, 1745 protocol_decl); 1746 1747 finish_var_decl (class_decl, initlist); 1748 impent->class_decl = class_decl; 1749 } 1750 1751 /* --- Output GNU Metadata --- */ 1752 1753 /* TODO: Make this into an array of refs. */ 1754 static void 1755 handle_class_ref (tree chain) 1756 { 1757 const char *name = IDENTIFIER_POINTER (TREE_VALUE (chain)); 1758 char *string = (char *) alloca (strlen (name) + 30); 1759 tree decl; 1760 tree exp; 1761 1762 sprintf (string, "__objc_class_name_%s", name); 1763 1764 /* Make a decl for this name, so we can use its address in a tree. */ 1765 decl = build_decl (input_location, 1766 VAR_DECL, get_identifier (string), TREE_TYPE (integer_zero_node)); 1767 DECL_EXTERNAL (decl) = 1; 1768 TREE_PUBLIC (decl) = 1; 1769 DECL_CONTEXT (decl) = NULL_TREE; 1770 finish_var_decl (decl, 0); 1771 1772 /* Make a decl for the address. */ 1773 sprintf (string, "__objc_class_ref_%s", name); 1774 exp = build1 (ADDR_EXPR, string_type_node, decl); 1775 decl = build_decl (input_location, 1776 VAR_DECL, get_identifier (string), string_type_node); 1777 TREE_STATIC (decl) = 1; 1778 TREE_USED (decl) = 1; 1779 DECL_READ_P (decl) = 1; 1780 DECL_ARTIFICIAL (decl) = 1; 1781 DECL_INITIAL (decl) = error_mark_node; 1782 1783 /* We must force the reference. */ 1784 DECL_PRESERVE_P (decl) = 1; 1785 1786 DECL_CONTEXT (decl) = NULL_TREE; 1787 finish_var_decl (decl, exp); 1788 } 1789 1790 static tree 1791 get_proto_encoding (tree proto) 1792 { 1793 tree encoding; 1794 if (proto) 1795 { 1796 if (! METHOD_ENCODING (proto)) 1797 { 1798 encoding = encode_method_prototype (proto); 1799 METHOD_ENCODING (proto) = encoding; 1800 } 1801 else 1802 encoding = METHOD_ENCODING (proto); 1803 1804 return add_objc_string (encoding, meth_var_types); 1805 } 1806 else 1807 return build_int_cst (NULL_TREE, 0); 1808 } 1809 1810 static void 1811 build_gnu_selector_translation_table (void) 1812 { 1813 tree chain, expr; 1814 VEC(constructor_elt,gc) *inits = NULL; 1815 VEC(constructor_elt,gc) *v ; 1816 1817 /* Cause the selector table (previously forward-declared) 1818 to be actually output. */ 1819 1820 for (chain = sel_ref_chain; chain; chain = TREE_CHAIN (chain)) 1821 { 1822 tree encoding; 1823 if (warn_selector) 1824 { 1825 /* TODO: improve on the location for the diagnostic. */ 1826 location_t loc = input_location; 1827 diagnose_missing_method (TREE_VALUE (chain), loc); 1828 } 1829 1830 v = NULL; 1831 expr = build_selector (TREE_VALUE (chain)); 1832 encoding = get_proto_encoding (TREE_PURPOSE (chain)); 1833 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1834 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, encoding); 1835 expr = objc_build_constructor (objc_selector_template, v); 1836 1837 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, expr); 1838 } /* each element in the chain */ 1839 1840 /* List terminator. */ 1841 v = NULL; 1842 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, integer_zero_node); 1843 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, integer_zero_node); 1844 expr = objc_build_constructor (objc_selector_template, v); 1845 1846 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, expr); 1847 expr = objc_build_constructor (TREE_TYPE (UOBJC_SELECTOR_TABLE_decl), 1848 inits); 1849 finish_var_decl (UOBJC_SELECTOR_TABLE_decl, expr); 1850 } 1851 1852 /* Output references to all statically allocated objects. Return the DECL 1853 for the array built. */ 1854 1855 static void 1856 generate_static_references (void) 1857 { 1858 tree expr = NULL_TREE; 1859 tree class_name, klass, decl; 1860 tree cl_chain, in_chain, type 1861 = build_array_type (build_pointer_type (void_type_node), NULL_TREE); 1862 int num_inst, num_class; 1863 char buf[BUFSIZE]; 1864 VEC(constructor_elt,gc) *decls = NULL; 1865 1866 /* FIXME: Remove NeXT runtime code. */ 1867 if (flag_next_runtime) 1868 gcc_unreachable (); 1869 1870 for (cl_chain = objc_static_instances, num_class = 0; 1871 cl_chain; cl_chain = TREE_CHAIN (cl_chain), num_class++) 1872 { 1873 VEC(constructor_elt,gc) *v = NULL; 1874 1875 for (num_inst = 0, in_chain = TREE_PURPOSE (cl_chain); 1876 in_chain; num_inst++, in_chain = TREE_CHAIN (in_chain)); 1877 1878 snprintf (buf, BUFSIZE, "_OBJC_STATIC_INSTANCES_%d", num_class); 1879 decl = start_var_decl (type, buf); 1880 1881 /* Output {class_name, ...}. */ 1882 klass = TREE_VALUE (cl_chain); 1883 class_name = get_objc_string_decl (OBJC_TYPE_NAME (klass), class_names); 1884 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 1885 build_unary_op (input_location, 1886 ADDR_EXPR, class_name, 1)); 1887 1888 /* Output {..., instance, ...}. */ 1889 for (in_chain = TREE_PURPOSE (cl_chain); 1890 in_chain; in_chain = TREE_CHAIN (in_chain)) 1891 { 1892 expr = build_unary_op (input_location, 1893 ADDR_EXPR, TREE_VALUE (in_chain), 1); 1894 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1895 } 1896 1897 /* Output {..., NULL}. */ 1898 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1899 1900 expr = objc_build_constructor (TREE_TYPE (decl), v); 1901 OBJCMETA (decl, objc_meta, meta_base); 1902 finish_var_decl (decl, expr); 1903 CONSTRUCTOR_APPEND_ELT (decls, NULL_TREE, 1904 build_unary_op (input_location, 1905 ADDR_EXPR, decl, 1)); 1906 } 1907 1908 CONSTRUCTOR_APPEND_ELT (decls, NULL_TREE, build_int_cst (NULL_TREE, 0)); 1909 expr = objc_build_constructor (type, decls); 1910 static_instances_decl = start_var_decl (type, "_OBJC_STATIC_INSTANCES"); 1911 OBJCMETA (static_instances_decl, objc_meta, meta_base); 1912 finish_var_decl (static_instances_decl, expr); 1913 } 1914 1915 /* Create the initial value for the `defs' field of _objc_symtab. 1916 This is a CONSTRUCTOR. */ 1917 1918 static tree 1919 init_def_list (tree type) 1920 { 1921 tree expr; 1922 struct imp_entry *impent; 1923 location_t loc; 1924 VEC(constructor_elt,gc) *v = NULL; 1925 1926 if (imp_count) 1927 for (impent = imp_list; impent; impent = impent->next) 1928 { 1929 if (TREE_CODE (impent->imp_context) == CLASS_IMPLEMENTATION_TYPE) 1930 { 1931 loc = DECL_SOURCE_LOCATION (impent->class_decl); 1932 expr = build_unary_op (loc, 1933 ADDR_EXPR, impent->class_decl, 0); 1934 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1935 } 1936 } 1937 1938 if (cat_count) 1939 for (impent = imp_list; impent; impent = impent->next) 1940 { 1941 if (TREE_CODE (impent->imp_context) == CATEGORY_IMPLEMENTATION_TYPE) 1942 { 1943 loc = DECL_SOURCE_LOCATION (impent->class_decl); 1944 expr = build_unary_op (loc, 1945 ADDR_EXPR, impent->class_decl, 0); 1946 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1947 } 1948 } 1949 1950 loc = UNKNOWN_LOCATION; 1951 /* statics = { ..., _OBJC_STATIC_INSTANCES, ... } */ 1952 if (static_instances_decl) 1953 expr = build_unary_op (loc, ADDR_EXPR, static_instances_decl, 0); 1954 else 1955 expr = integer_zero_node; 1956 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 1957 1958 return objc_build_constructor (type, v); 1959 } 1960 1961 /* Take care of defining and initializing _OBJC_SYMBOLS. */ 1962 1963 /* Predefine the following data type: 1964 1965 struct _objc_symtab 1966 { 1967 long sel_ref_cnt; 1968 SEL *refs; 1969 short cls_def_cnt; 1970 short cat_def_cnt; 1971 void *defs[cls_def_cnt + cat_def_cnt]; 1972 }; */ 1973 1974 static void 1975 build_objc_symtab_template (void) 1976 { 1977 tree fields, array_type, *chain = NULL; 1978 int index; 1979 1980 objc_symtab_template = objc_start_struct (get_identifier (UTAG_SYMTAB)); 1981 1982 /* long sel_ref_cnt; */ 1983 fields = add_field_decl (long_integer_type_node, "sel_ref_cnt", &chain); 1984 1985 /* SEL *refs; */ 1986 add_field_decl (build_pointer_type (objc_selector_type), "refs", &chain); 1987 1988 /* short cls_def_cnt; */ 1989 add_field_decl (short_integer_type_node, "cls_def_cnt", &chain); 1990 1991 /* short cat_def_cnt; */ 1992 add_field_decl (short_integer_type_node, "cat_def_cnt", &chain); 1993 1994 /* Note that padding will be added here on LP64. */ 1995 1996 /* void *defs[imp_count + cat_count (+ 1)]; */ 1997 /* NB: The index is one less than the size of the array. */ 1998 index = imp_count + cat_count; 1999 array_type = build_sized_array_type (ptr_type_node, index + 1); 2000 add_field_decl (array_type, "defs", &chain); 2001 2002 objc_finish_struct (objc_symtab_template, fields); 2003 } 2004 /* Construct the initial value for all of _objc_symtab. */ 2005 2006 static tree 2007 init_objc_symtab (tree type) 2008 { 2009 tree field, expr, ltyp; 2010 location_t loc; 2011 VEC(constructor_elt,gc) *v = NULL; 2012 2013 loc = UNKNOWN_LOCATION; 2014 2015 /* sel_ref_cnt = { ..., 5, ... } */ 2016 2017 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 2018 build_int_cst (long_integer_type_node, 0)); 2019 2020 /* refs = { ..., _OBJC_SELECTOR_TABLE, ... } */ 2021 2022 ltyp = build_pointer_type (objc_selector_type); 2023 if (sel_ref_chain) 2024 expr = convert (ltyp, build_unary_op (loc, ADDR_EXPR, 2025 UOBJC_SELECTOR_TABLE_decl, 1)); 2026 else 2027 expr = convert (ltyp, null_pointer_node); 2028 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr); 2029 2030 /* cls_def_cnt = { ..., 5, ... } */ 2031 2032 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 2033 build_int_cst (short_integer_type_node, imp_count)); 2034 2035 /* cat_def_cnt = { ..., 5, ... } */ 2036 2037 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, 2038 build_int_cst (short_integer_type_node, cat_count)); 2039 2040 /* cls_def = { ..., { &Foo, &Bar, ...}, ... } */ 2041 2042 field = TYPE_FIELDS (type); 2043 field = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (field)))); 2044 2045 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init_def_list (TREE_TYPE (field))); 2046 2047 return objc_build_constructor (type, v); 2048 } 2049 2050 /* Create the declaration of _OBJC_SYMBOLS, with type `struct _objc_symtab' 2051 and initialized appropriately. */ 2052 2053 static void 2054 generate_objc_symtab_decl (void) 2055 { 2056 build_objc_symtab_template (); 2057 UOBJC_SYMBOLS_decl = start_var_decl (objc_symtab_template, "_OBJC_SYMBOLS"); 2058 OBJCMETA (UOBJC_SYMBOLS_decl, objc_meta, meta_base); 2059 finish_var_decl (UOBJC_SYMBOLS_decl, 2060 init_objc_symtab (TREE_TYPE (UOBJC_SYMBOLS_decl))); 2061 } 2062 2063 static void 2064 objc_generate_v1_gnu_metadata (void) 2065 { 2066 struct imp_entry *impent; 2067 tree chain; 2068 2069 /* Process the static instances here because initialization of objc_symtab 2070 depends on them. */ 2071 if (objc_static_instances) 2072 generate_static_references (); 2073 2074 objc_implementation_context = 2075 implementation_template = 2076 UOBJC_CLASS_decl = 2077 UOBJC_METACLASS_decl = NULL_TREE; 2078 2079 for (impent = imp_list; impent; impent = impent->next) 2080 { 2081 /* If -gen-decls is present, Dump the @interface of each class. 2082 TODO: Dump the classes in the order they were found, rather than in 2083 reverse order as we are doing now. */ 2084 if (flag_gen_declaration) 2085 dump_interface (gen_declaration_file, impent->imp_context); 2086 2087 /* all of the following reference the string pool... */ 2088 if (TREE_CODE (impent->imp_context) == CLASS_IMPLEMENTATION_TYPE) 2089 generate_class_structures (impent); 2090 else 2091 generate_category (impent); 2092 } 2093 2094 /* If we are using an array of selectors, we must always 2095 finish up the array decl even if no selectors were used. */ 2096 build_gnu_selector_translation_table (); 2097 2098 if (protocol_chain) 2099 generate_protocols (); 2100 2101 /* Arrange for ObjC data structures to be initialized at run time. */ 2102 /* FIXME: Have some more elegant way to determine if we need to 2103 generate objc_symtab_decl or not, instead of checking these 2104 global symbols. */ 2105 if (imp_list || class_names_chain 2106 || meth_var_names_chain || meth_var_types_chain || sel_ref_chain 2107 || prop_names_attr_chain) 2108 generate_objc_symtab_decl (); 2109 2110 if (imp_list || class_names_chain || objc_static_instances 2111 || meth_var_names_chain || meth_var_types_chain || sel_ref_chain) 2112 { 2113 /* Make sure that the meta-data are identified as being 2114 GNU-runtime. */ 2115 build_module_descriptor (OBJC_VERSION, 2116 build_tree_list (objc_meta, meta_base)); 2117 build_module_initializer_routine (); 2118 } 2119 2120 /* Dump the class references. This forces the appropriate classes 2121 to be linked into the executable image, preserving unix archive 2122 semantics. This can be removed when we move to a more dynamically 2123 linked environment. */ 2124 2125 for (chain = cls_ref_chain; chain; chain = TREE_CHAIN (chain)) 2126 { 2127 handle_class_ref (chain); 2128 if (TREE_PURPOSE (chain)) 2129 generate_classref_translation_entry (chain); 2130 } 2131 2132 for (impent = imp_list; impent; impent = impent->next) 2133 handle_impent (impent); 2134 2135 generate_strings (); 2136 } 2137 2138 /* --- exceptions --- */ 2139 2140 static GTY(()) tree objc_eh_personality_decl; 2141 2142 static tree 2143 objc_eh_runtime_type (tree type) 2144 { 2145 tree ident, eh_id, decl, str; 2146 2147 if (type == error_mark_node 2148 || errorcount || sorrycount) 2149 { 2150 /* Use 'ErrorMarkNode' as class name when error_mark_node is found 2151 to prevent an ICE. Note that we know that the compiler will 2152 terminate with an error and this 'ErrorMarkNode' class name will 2153 never be actually used. */ 2154 ident = get_identifier ("ErrorMarkNode"); 2155 goto make_err_class; 2156 } 2157 2158 if (POINTER_TYPE_P (type) && objc_is_object_id (TREE_TYPE (type))) 2159 /* We don't want to identify 'id' for GNU. Instead, build a 0 2160 entry in the exceptions table. */ 2161 return null_pointer_node; 2162 2163 if (!POINTER_TYPE_P (type) || !TYPED_OBJECT (TREE_TYPE (type))) 2164 { 2165 #ifdef OBJCPLUS 2166 /* This routine is also called for c++ catch clauses; in which case, 2167 we use the c++ typeinfo decl. */ 2168 return build_eh_type_type (type); 2169 #else 2170 error ("non-objective-c type '%T' cannot be caught", type); 2171 ident = get_identifier ("ErrorMarkNode"); 2172 goto make_err_class; 2173 #endif 2174 } 2175 else 2176 ident = OBJC_TYPE_NAME (TREE_TYPE (type)); 2177 2178 make_err_class: 2179 /* If this class was already referenced, then it will be output during 2180 meta-data emission, so we don't need to do it here. */ 2181 decl = get_objc_string_decl (ident, class_names); 2182 eh_id = add_objc_string (ident, class_names); 2183 if (!decl) 2184 { 2185 /* Not found ... so we need to build it - from the freshly-entered id. */ 2186 decl = get_objc_string_decl (ident, class_names); 2187 str = my_build_string (IDENTIFIER_LENGTH (ident) + 1, 2188 IDENTIFIER_POINTER (ident)); 2189 /* We have to finalize this var here, because this might be called after 2190 all the other metadata strings have been emitted. */ 2191 finish_var_decl (decl, str); 2192 } 2193 return eh_id; 2194 } 2195 2196 static tree 2197 objc_eh_personality (void) 2198 { 2199 if (!objc_eh_personality_decl) 2200 #ifndef OBJCPLUS 2201 objc_eh_personality_decl = build_personality_function ("gnu_objc"); 2202 #else 2203 objc_eh_personality_decl = build_personality_function ("gxx"); 2204 #endif 2205 return objc_eh_personality_decl; 2206 } 2207 2208 /* -- interfaces --- */ 2209 2210 static tree 2211 build_throw_stmt (location_t loc, tree throw_expr, bool rethrown ATTRIBUTE_UNUSED) 2212 { 2213 tree t; 2214 VEC(tree, gc) *parms = VEC_alloc (tree, gc, 1); 2215 /* A throw is just a call to the runtime throw function with the 2216 object as a parameter. */ 2217 VEC_quick_push (tree, parms, throw_expr); 2218 t = build_function_call_vec (loc, objc_exception_throw_decl, parms, NULL); 2219 VEC_free (tree, gc, parms); 2220 return add_stmt (t); 2221 } 2222 2223 /* Build __builtin_eh_pointer. */ 2224 2225 static tree 2226 objc_build_exc_ptr (struct objc_try_context **x ATTRIBUTE_UNUSED) 2227 { 2228 tree t; 2229 t = builtin_decl_explicit (BUILT_IN_EH_POINTER); 2230 t = build_call_expr (t, 1, integer_zero_node); 2231 return fold_convert (objc_object_type, t); 2232 } 2233 2234 static tree 2235 begin_catch (struct objc_try_context **cur_try_context, tree type, 2236 tree decl, tree compound, bool ellipsis ATTRIBUTE_UNUSED) 2237 { 2238 tree t; 2239 /* Record the data for the catch in the try context so that we can 2240 finalize it later. */ 2241 if (ellipsis) 2242 t = build_stmt (input_location, CATCH_EXPR, NULL, compound); 2243 else 2244 t = build_stmt (input_location, CATCH_EXPR, type, compound); 2245 (*cur_try_context)->current_catch = t; 2246 2247 /* Initialize the decl from the EXC_PTR_EXPR we get from the runtime. */ 2248 t = objc_build_exc_ptr (cur_try_context); 2249 t = convert (TREE_TYPE (decl), t); 2250 return build2 (MODIFY_EXPR, void_type_node, decl, t); 2251 } 2252 2253 static void 2254 finish_catch (struct objc_try_context **cur_try_context, tree current_catch) 2255 { 2256 append_to_statement_list (current_catch, &((*cur_try_context)->catch_list)); 2257 } 2258 2259 static tree 2260 finish_try_stmt (struct objc_try_context **cur_try_context) 2261 { 2262 struct objc_try_context *c = *cur_try_context; 2263 tree stmt = c->try_body; 2264 if (c->catch_list) 2265 stmt = build_stmt (c->try_locus, TRY_CATCH_EXPR, stmt, c->catch_list); 2266 if (c->finally_body) 2267 stmt = build_stmt (c->try_locus, TRY_FINALLY_EXPR, stmt, c->finally_body); 2268 return stmt; 2269 } 2270 2271 #include "gt-objc-objc-gnu-runtime-abi-01.h" 2272