1/* Implement classes and message passing for Objective C. 2 Copyright (C) 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 4 Contributed by Steve Naroff. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify 9it under the terms of the GNU General Public License as published by 10the Free Software Foundation; either version 2, or (at your option) 11any later version. 12 13GCC is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16GNU General Public License for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING. If not, write to 20the Free Software Foundation, 51 Franklin Street, Fifth Floor, 21Boston, MA 02110-1301, USA. */ 22 23/* Purpose: This module implements the Objective-C 4.0 language. 24 25 compatibility issues (with the Stepstone translator): 26 27 - does not recognize the following 3.3 constructs. 28 @requires, @classes, @messages, = (...) 29 - methods with variable arguments must conform to ANSI standard. 30 - tagged structure definitions that appear in BOTH the interface 31 and implementation are not allowed. 32 - public/private: all instance variables are public within the 33 context of the implementation...I consider this to be a bug in 34 the translator. 35 - statically allocated objects are not supported. the user will 36 receive an error if this service is requested. 37 38 code generation `options': 39 40 */ 41 42#include "config.h" 43#include "system.h" 44#include "coretypes.h" 45#include "tm.h" 46#include "tree.h" 47#include "rtl.h" 48#include "tm_p.h" 49#include "expr.h" 50 51#ifdef OBJCPLUS 52#include "cp-tree.h" 53#else 54#include "c-tree.h" 55#endif 56 57#include "c-common.h" 58#include "c-pragma.h" 59#include "flags.h" 60#include "langhooks.h" 61#include "objc-act.h" 62#include "input.h" 63#include "except.h" 64#include "function.h" 65#include "output.h" 66#include "toplev.h" 67#include "ggc.h" 68#include "varray.h" 69#include "debug.h" 70#include "target.h" 71#include "diagnostic.h" 72#include "cgraph.h" 73#include "tree-iterator.h" 74#include "libfuncs.h" 75#include "hashtab.h" 76#include "langhooks-def.h" 77 78#define OBJC_VOID_AT_END void_list_node 79 80static unsigned int should_call_super_dealloc = 0; 81 82/* When building Objective-C++, we are not linking against the C front-end 83 and so need to replicate the C tree-construction functions in some way. */ 84#ifdef OBJCPLUS 85#define OBJCP_REMAP_FUNCTIONS 86#include "objcp-decl.h" 87#endif /* OBJCPLUS */ 88 89/* This is the default way of generating a method name. */ 90/* I am not sure it is really correct. 91 Perhaps there's a danger that it will make name conflicts 92 if method names contain underscores. -- rms. */ 93#ifndef OBJC_GEN_METHOD_LABEL 94#define OBJC_GEN_METHOD_LABEL(BUF, IS_INST, CLASS_NAME, CAT_NAME, SEL_NAME, NUM) \ 95 do { \ 96 char *temp; \ 97 sprintf ((BUF), "_%s_%s_%s_%s", \ 98 ((IS_INST) ? "i" : "c"), \ 99 (CLASS_NAME), \ 100 ((CAT_NAME)? (CAT_NAME) : ""), \ 101 (SEL_NAME)); \ 102 for (temp = (BUF); *temp; temp++) \ 103 if (*temp == ':') *temp = '_'; \ 104 } while (0) 105#endif 106 107/* These need specifying. */ 108#ifndef OBJC_FORWARDING_STACK_OFFSET 109#define OBJC_FORWARDING_STACK_OFFSET 0 110#endif 111 112#ifndef OBJC_FORWARDING_MIN_OFFSET 113#define OBJC_FORWARDING_MIN_OFFSET 0 114#endif 115 116/* Set up for use of obstacks. */ 117 118#include "obstack.h" 119 120/* This obstack is used to accumulate the encoding of a data type. */ 121static struct obstack util_obstack; 122 123/* This points to the beginning of obstack contents, so we can free 124 the whole contents. */ 125char *util_firstobj; 126 127/* The version identifies which language generation and runtime 128 the module (file) was compiled for, and is recorded in the 129 module descriptor. */ 130 131#define OBJC_VERSION (flag_next_runtime ? 6 : 8) 132#define PROTOCOL_VERSION 2 133 134/* (Decide if these can ever be validly changed.) */ 135#define OBJC_ENCODE_INLINE_DEFS 0 136#define OBJC_ENCODE_DONT_INLINE_DEFS 1 137 138/*** Private Interface (procedures) ***/ 139 140/* Used by compile_file. */ 141 142static void init_objc (void); 143static void finish_objc (void); 144 145/* Code generation. */ 146 147static tree objc_build_constructor (tree, tree); 148static tree build_objc_method_call (int, tree, tree, tree, tree); 149static tree get_proto_encoding (tree); 150static tree lookup_interface (tree); 151static tree objc_add_static_instance (tree, tree); 152 153static tree start_class (enum tree_code, tree, tree, tree); 154static tree continue_class (tree); 155static void finish_class (tree); 156static void start_method_def (tree); 157#ifdef OBJCPLUS 158static void objc_start_function (tree, tree, tree, tree); 159#else 160static void objc_start_function (tree, tree, tree, struct c_arg_info *); 161#endif 162static tree start_protocol (enum tree_code, tree, tree); 163static tree build_method_decl (enum tree_code, tree, tree, tree, bool); 164static tree objc_add_method (tree, tree, int); 165static tree add_instance_variable (tree, int, tree); 166static tree build_ivar_reference (tree); 167static tree is_ivar (tree, tree); 168 169static void build_objc_exception_stuff (void); 170static void build_next_objc_exception_stuff (void); 171 172/* We only need the following for ObjC; ObjC++ will use C++'s definition 173 of DERIVED_FROM_P. */ 174#ifndef OBJCPLUS 175static bool objc_derived_from_p (tree, tree); 176#define DERIVED_FROM_P(PARENT, CHILD) objc_derived_from_p (PARENT, CHILD) 177#endif 178static void objc_xref_basetypes (tree, tree); 179 180static void build_class_template (void); 181static void build_selector_template (void); 182static void build_category_template (void); 183static void build_super_template (void); 184static tree build_protocol_initializer (tree, tree, tree, tree, tree); 185static tree get_class_ivars (tree, bool); 186static tree generate_protocol_list (tree); 187static void build_protocol_reference (tree); 188 189#ifdef OBJCPLUS 190static void objc_generate_cxx_cdtors (void); 191#endif 192 193static const char *synth_id_with_class_suffix (const char *, tree); 194 195/* Hash tables to manage the global pool of method prototypes. */ 196 197hash *nst_method_hash_list = 0; 198hash *cls_method_hash_list = 0; 199 200static hash hash_lookup (hash *, tree); 201static tree lookup_method (tree, tree); 202static tree lookup_method_static (tree, tree, int); 203 204enum string_section 205{ 206 class_names, /* class, category, protocol, module names */ 207 meth_var_names, /* method and variable names */ 208 meth_var_types /* method and variable type descriptors */ 209}; 210 211static tree add_objc_string (tree, enum string_section); 212static tree build_objc_string_decl (enum string_section); 213static void build_selector_table_decl (void); 214 215/* Protocol additions. */ 216 217static tree lookup_protocol (tree); 218static tree lookup_and_install_protocols (tree); 219 220/* Type encoding. */ 221 222static void encode_type_qualifiers (tree); 223static void encode_type (tree, int, int); 224static void encode_field_decl (tree, int, int); 225 226#ifdef OBJCPLUS 227static void really_start_method (tree, tree); 228#else 229static void really_start_method (tree, struct c_arg_info *); 230#endif 231static int comp_proto_with_proto (tree, tree, int); 232static void objc_push_parm (tree); 233#ifdef OBJCPLUS 234static tree objc_get_parm_info (int); 235#else 236static struct c_arg_info *objc_get_parm_info (int); 237#endif 238 239/* Utilities for debugging and error diagnostics. */ 240 241static void warn_with_method (const char *, int, tree); 242static char *gen_type_name (tree); 243static char *gen_type_name_0 (tree); 244static char *gen_method_decl (tree); 245static char *gen_declaration (tree); 246 247/* Everything else. */ 248 249static tree create_field_decl (tree, const char *); 250static void add_class_reference (tree); 251static void build_protocol_template (void); 252static tree encode_method_prototype (tree); 253static void generate_classref_translation_entry (tree); 254static void handle_class_ref (tree); 255static void generate_struct_by_value_array (void) 256 ATTRIBUTE_NORETURN; 257static void mark_referenced_methods (void); 258static void generate_objc_image_info (void); 259 260/*** Private Interface (data) ***/ 261 262/* Reserved tag definitions. */ 263 264#define OBJECT_TYPEDEF_NAME "id" 265#define CLASS_TYPEDEF_NAME "Class" 266 267#define TAG_OBJECT "objc_object" 268#define TAG_CLASS "objc_class" 269#define TAG_SUPER "objc_super" 270#define TAG_SELECTOR "objc_selector" 271 272#define UTAG_CLASS "_objc_class" 273#define UTAG_IVAR "_objc_ivar" 274#define UTAG_IVAR_LIST "_objc_ivar_list" 275#define UTAG_METHOD "_objc_method" 276#define UTAG_METHOD_LIST "_objc_method_list" 277#define UTAG_CATEGORY "_objc_category" 278#define UTAG_MODULE "_objc_module" 279#define UTAG_SYMTAB "_objc_symtab" 280#define UTAG_SUPER "_objc_super" 281#define UTAG_SELECTOR "_objc_selector" 282 283#define UTAG_PROTOCOL "_objc_protocol" 284#define UTAG_METHOD_PROTOTYPE "_objc_method_prototype" 285#define UTAG_METHOD_PROTOTYPE_LIST "_objc__method_prototype_list" 286 287/* Note that the string object global name is only needed for the 288 NeXT runtime. */ 289#define STRING_OBJECT_GLOBAL_FORMAT "_%sClassReference" 290 291#define PROTOCOL_OBJECT_CLASS_NAME "Protocol" 292 293static const char *TAG_GETCLASS; 294static const char *TAG_GETMETACLASS; 295static const char *TAG_MSGSEND; 296static const char *TAG_MSGSENDSUPER; 297/* The NeXT Objective-C messenger may have two extra entry points, for use 298 when returning a structure. */ 299static const char *TAG_MSGSEND_STRET; 300static const char *TAG_MSGSENDSUPER_STRET; 301static const char *default_constant_string_class_name; 302 303/* Runtime metadata flags. */ 304#define CLS_FACTORY 0x0001L 305#define CLS_META 0x0002L 306#define CLS_HAS_CXX_STRUCTORS 0x2000L 307 308#define OBJC_MODIFIER_STATIC 0x00000001 309#define OBJC_MODIFIER_FINAL 0x00000002 310#define OBJC_MODIFIER_PUBLIC 0x00000004 311#define OBJC_MODIFIER_PRIVATE 0x00000008 312#define OBJC_MODIFIER_PROTECTED 0x00000010 313#define OBJC_MODIFIER_NATIVE 0x00000020 314#define OBJC_MODIFIER_SYNCHRONIZED 0x00000040 315#define OBJC_MODIFIER_ABSTRACT 0x00000080 316#define OBJC_MODIFIER_VOLATILE 0x00000100 317#define OBJC_MODIFIER_TRANSIENT 0x00000200 318#define OBJC_MODIFIER_NONE_SPECIFIED 0x80000000 319 320/* NeXT-specific tags. */ 321 322#define TAG_MSGSEND_NONNIL "objc_msgSendNonNil" 323#define TAG_MSGSEND_NONNIL_STRET "objc_msgSendNonNil_stret" 324#define TAG_EXCEPTIONEXTRACT "objc_exception_extract" 325#define TAG_EXCEPTIONTRYENTER "objc_exception_try_enter" 326#define TAG_EXCEPTIONTRYEXIT "objc_exception_try_exit" 327#define TAG_EXCEPTIONMATCH "objc_exception_match" 328#define TAG_EXCEPTIONTHROW "objc_exception_throw" 329#define TAG_SYNCENTER "objc_sync_enter" 330#define TAG_SYNCEXIT "objc_sync_exit" 331#define TAG_SETJMP "_setjmp" 332#define UTAG_EXCDATA "_objc_exception_data" 333 334#define TAG_ASSIGNIVAR "objc_assign_ivar" 335#define TAG_ASSIGNGLOBAL "objc_assign_global" 336#define TAG_ASSIGNSTRONGCAST "objc_assign_strongCast" 337 338/* Branch entry points. All that matters here are the addresses; 339 functions with these names do not really exist in libobjc. */ 340 341#define TAG_MSGSEND_FAST "objc_msgSend_Fast" 342#define TAG_ASSIGNIVAR_FAST "objc_assign_ivar_Fast" 343 344#define TAG_CXX_CONSTRUCT ".cxx_construct" 345#define TAG_CXX_DESTRUCT ".cxx_destruct" 346 347/* GNU-specific tags. */ 348 349#define TAG_EXECCLASS "__objc_exec_class" 350#define TAG_GNUINIT "__objc_gnu_init" 351 352/* Flags for lookup_method_static(). */ 353#define OBJC_LOOKUP_CLASS 1 /* Look for class methods. */ 354#define OBJC_LOOKUP_NO_SUPER 2 /* Do not examine superclasses. */ 355 356/* The OCTI_... enumeration itself is in objc/objc-act.h. */ 357tree objc_global_trees[OCTI_MAX]; 358 359static void handle_impent (struct imp_entry *); 360 361struct imp_entry *imp_list = 0; 362int imp_count = 0; /* `@implementation' */ 363int cat_count = 0; /* `@category' */ 364 365enum tree_code objc_inherit_code; 366int objc_public_flag; 367 368/* Use to generate method labels. */ 369static int method_slot = 0; 370 371#define BUFSIZE 1024 372 373static char *errbuf; /* Buffer for error diagnostics */ 374 375/* Data imported from tree.c. */ 376 377extern enum debug_info_type write_symbols; 378 379/* Data imported from toplev.c. */ 380 381extern const char *dump_base_name; 382 383static int flag_typed_selectors; 384 385/* Store all constructed constant strings in a hash table so that 386 they get uniqued properly. */ 387 388struct string_descriptor GTY(()) 389{ 390 /* The literal argument . */ 391 tree literal; 392 393 /* The resulting constant string. */ 394 tree constructor; 395}; 396 397static GTY((param_is (struct string_descriptor))) htab_t string_htab; 398 399/* Store the EH-volatilized types in a hash table, for easy retrieval. */ 400struct volatilized_type GTY(()) 401{ 402 tree type; 403}; 404 405static GTY((param_is (struct volatilized_type))) htab_t volatilized_htab; 406 407FILE *gen_declaration_file; 408 409/* Tells "encode_pointer/encode_aggregate" whether we are generating 410 type descriptors for instance variables (as opposed to methods). 411 Type descriptors for instance variables contain more information 412 than methods (for static typing and embedded structures). */ 413 414static int generating_instance_variables = 0; 415 416/* Some platforms pass small structures through registers versus 417 through an invisible pointer. Determine at what size structure is 418 the transition point between the two possibilities. */ 419 420static void 421generate_struct_by_value_array (void) 422{ 423 tree type; 424 tree field_decl, field_decl_chain; 425 int i, j; 426 int aggregate_in_mem[32]; 427 int found = 0; 428 429 /* Presumably no platform passes 32 byte structures in a register. */ 430 for (i = 1; i < 32; i++) 431 { 432 char buffer[5]; 433 434 /* Create an unnamed struct that has `i' character components */ 435 type = start_struct (RECORD_TYPE, NULL_TREE); 436 437 strcpy (buffer, "c1"); 438 field_decl = create_field_decl (char_type_node, 439 buffer); 440 field_decl_chain = field_decl; 441 442 for (j = 1; j < i; j++) 443 { 444 sprintf (buffer, "c%d", j + 1); 445 field_decl = create_field_decl (char_type_node, 446 buffer); 447 chainon (field_decl_chain, field_decl); 448 } 449 finish_struct (type, field_decl_chain, NULL_TREE); 450 451 aggregate_in_mem[i] = aggregate_value_p (type, 0); 452 if (!aggregate_in_mem[i]) 453 found = 1; 454 } 455 456 /* We found some structures that are returned in registers instead of memory 457 so output the necessary data. */ 458 if (found) 459 { 460 for (i = 31; i >= 0; i--) 461 if (!aggregate_in_mem[i]) 462 break; 463 printf ("#define OBJC_MAX_STRUCT_BY_VALUE %d\n\n", i); 464 465 /* The first member of the structure is always 0 because we don't handle 466 structures with 0 members */ 467 printf ("static int struct_forward_array[] = {\n 0"); 468 469 for (j = 1; j <= i; j++) 470 printf (", %d", aggregate_in_mem[j]); 471 printf ("\n};\n"); 472 } 473 474 exit (0); 475} 476 477bool 478objc_init (void) 479{ 480#ifdef OBJCPLUS 481 if (cxx_init () == false) 482#else 483 if (c_objc_common_init () == false) 484#endif 485 return false; 486 487#ifndef USE_MAPPED_LOCATION 488 /* Force the line number back to 0; check_newline will have 489 raised it to 1, which will make the builtin functions appear 490 not to be built in. */ 491 input_line = 0; 492#endif 493 494 /* If gen_declaration desired, open the output file. */ 495 if (flag_gen_declaration) 496 { 497 register char * const dumpname = concat (dump_base_name, ".decl", NULL); 498 gen_declaration_file = fopen (dumpname, "w"); 499 if (gen_declaration_file == 0) 500 fatal_error ("can't open %s: %m", dumpname); 501 free (dumpname); 502 } 503 504 if (flag_next_runtime) 505 { 506 TAG_GETCLASS = "objc_getClass"; 507 TAG_GETMETACLASS = "objc_getMetaClass"; 508 TAG_MSGSEND = "objc_msgSend"; 509 TAG_MSGSENDSUPER = "objc_msgSendSuper"; 510 TAG_MSGSEND_STRET = "objc_msgSend_stret"; 511 TAG_MSGSENDSUPER_STRET = "objc_msgSendSuper_stret"; 512 default_constant_string_class_name = "NSConstantString"; 513 } 514 else 515 { 516 TAG_GETCLASS = "objc_get_class"; 517 TAG_GETMETACLASS = "objc_get_meta_class"; 518 TAG_MSGSEND = "objc_msg_lookup"; 519 TAG_MSGSENDSUPER = "objc_msg_lookup_super"; 520 /* GNU runtime does not provide special functions to support 521 structure-returning methods. */ 522 default_constant_string_class_name = "NXConstantString"; 523 flag_typed_selectors = 1; 524 } 525 526 init_objc (); 527 528 if (print_struct_values) 529 generate_struct_by_value_array (); 530 531 return true; 532} 533 534void 535objc_finish_file (void) 536{ 537 mark_referenced_methods (); 538 539#ifdef OBJCPLUS 540 /* We need to instantiate templates _before_ we emit ObjC metadata; 541 if we do not, some metadata (such as selectors) may go missing. */ 542 at_eof = 1; 543 instantiate_pending_templates (0); 544#endif 545 546 /* Finalize Objective-C runtime data. No need to generate tables 547 and code if only checking syntax, or if generating a PCH file. */ 548 if (!flag_syntax_only && !pch_file) 549 finish_objc (); 550 551 if (gen_declaration_file) 552 fclose (gen_declaration_file); 553 554#ifdef OBJCPLUS 555 cp_finish_file (); 556#endif 557} 558 559/* Return the first occurrence of a method declaration corresponding 560 to sel_name in rproto_list. Search rproto_list recursively. 561 If is_class is 0, search for instance methods, otherwise for class 562 methods. */ 563static tree 564lookup_method_in_protocol_list (tree rproto_list, tree sel_name, 565 int is_class) 566{ 567 tree rproto, p; 568 tree fnd = 0; 569 570 for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) 571 { 572 p = TREE_VALUE (rproto); 573 574 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) 575 { 576 if ((fnd = lookup_method (is_class 577 ? PROTOCOL_CLS_METHODS (p) 578 : PROTOCOL_NST_METHODS (p), sel_name))) 579 ; 580 else if (PROTOCOL_LIST (p)) 581 fnd = lookup_method_in_protocol_list (PROTOCOL_LIST (p), 582 sel_name, is_class); 583 } 584 else 585 { 586 ; /* An identifier...if we could not find a protocol. */ 587 } 588 589 if (fnd) 590 return fnd; 591 } 592 593 return 0; 594} 595 596static tree 597lookup_protocol_in_reflist (tree rproto_list, tree lproto) 598{ 599 tree rproto, p; 600 601 /* Make sure the protocol is supported by the object on the rhs. */ 602 if (TREE_CODE (lproto) == PROTOCOL_INTERFACE_TYPE) 603 { 604 tree fnd = 0; 605 for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) 606 { 607 p = TREE_VALUE (rproto); 608 609 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) 610 { 611 if (lproto == p) 612 fnd = lproto; 613 614 else if (PROTOCOL_LIST (p)) 615 fnd = lookup_protocol_in_reflist (PROTOCOL_LIST (p), lproto); 616 } 617 618 if (fnd) 619 return fnd; 620 } 621 } 622 else 623 { 624 ; /* An identifier...if we could not find a protocol. */ 625 } 626 627 return 0; 628} 629 630void 631objc_start_class_interface (tree class, tree super_class, tree protos) 632{ 633 objc_interface_context 634 = objc_ivar_context 635 = start_class (CLASS_INTERFACE_TYPE, class, super_class, protos); 636 objc_public_flag = 0; 637} 638 639void 640objc_start_category_interface (tree class, tree categ, tree protos) 641{ 642 objc_interface_context 643 = start_class (CATEGORY_INTERFACE_TYPE, class, categ, protos); 644 objc_ivar_chain 645 = continue_class (objc_interface_context); 646} 647 648void 649objc_start_protocol (tree name, tree protos) 650{ 651 objc_interface_context 652 = start_protocol (PROTOCOL_INTERFACE_TYPE, name, protos); 653} 654 655void 656objc_continue_interface (void) 657{ 658 objc_ivar_chain 659 = continue_class (objc_interface_context); 660} 661 662void 663objc_finish_interface (void) 664{ 665 finish_class (objc_interface_context); 666 objc_interface_context = NULL_TREE; 667} 668 669void 670objc_start_class_implementation (tree class, tree super_class) 671{ 672 objc_implementation_context 673 = objc_ivar_context 674 = start_class (CLASS_IMPLEMENTATION_TYPE, class, super_class, NULL_TREE); 675 objc_public_flag = 0; 676} 677 678void 679objc_start_category_implementation (tree class, tree categ) 680{ 681 objc_implementation_context 682 = start_class (CATEGORY_IMPLEMENTATION_TYPE, class, categ, NULL_TREE); 683 objc_ivar_chain 684 = continue_class (objc_implementation_context); 685} 686 687void 688objc_continue_implementation (void) 689{ 690 objc_ivar_chain 691 = continue_class (objc_implementation_context); 692} 693 694void 695objc_finish_implementation (void) 696{ 697#ifdef OBJCPLUS 698 if (flag_objc_call_cxx_cdtors) 699 objc_generate_cxx_cdtors (); 700#endif 701 702 if (objc_implementation_context) 703 { 704 finish_class (objc_implementation_context); 705 objc_ivar_chain = NULL_TREE; 706 objc_implementation_context = NULL_TREE; 707 } 708 else 709 warning (0, "%<@end%> must appear in an @implementation context"); 710} 711 712void 713objc_set_visibility (int visibility) 714{ 715 objc_public_flag = visibility; 716} 717 718void 719objc_set_method_type (enum tree_code type) 720{ 721 objc_inherit_code = (type == PLUS_EXPR 722 ? CLASS_METHOD_DECL 723 : INSTANCE_METHOD_DECL); 724} 725 726tree 727objc_build_method_signature (tree rettype, tree selector, 728 tree optparms, bool ellipsis) 729{ 730 return build_method_decl (objc_inherit_code, rettype, selector, 731 optparms, ellipsis); 732} 733 734void 735objc_add_method_declaration (tree decl) 736{ 737 if (!objc_interface_context) 738 fatal_error ("method declaration not in @interface context"); 739 740 objc_add_method (objc_interface_context, 741 decl, 742 objc_inherit_code == CLASS_METHOD_DECL); 743} 744 745void 746objc_start_method_definition (tree decl) 747{ 748 if (!objc_implementation_context) 749 fatal_error ("method definition not in @implementation context"); 750 751 objc_add_method (objc_implementation_context, 752 decl, 753 objc_inherit_code == CLASS_METHOD_DECL); 754 start_method_def (decl); 755} 756 757void 758objc_add_instance_variable (tree decl) 759{ 760 (void) add_instance_variable (objc_ivar_context, 761 objc_public_flag, 762 decl); 763} 764 765/* Return 1 if IDENT is an ObjC/ObjC++ reserved keyword in the context of 766 an '@'. */ 767 768int 769objc_is_reserved_word (tree ident) 770{ 771 unsigned char code = C_RID_CODE (ident); 772 773 return (OBJC_IS_AT_KEYWORD (code) 774#ifdef OBJCPLUS 775 || code == RID_CLASS || code == RID_PUBLIC 776 || code == RID_PROTECTED || code == RID_PRIVATE 777 || code == RID_TRY || code == RID_THROW || code == RID_CATCH 778#endif 779 ); 780} 781 782/* Return true if TYPE is 'id'. */ 783 784static bool 785objc_is_object_id (tree type) 786{ 787 return OBJC_TYPE_NAME (type) == objc_object_id; 788} 789 790static bool 791objc_is_class_id (tree type) 792{ 793 return OBJC_TYPE_NAME (type) == objc_class_id; 794} 795 796/* Construct a C struct with same name as CLASS, a base struct with tag 797 SUPER_NAME (if any), and FIELDS indicated. */ 798 799static tree 800objc_build_struct (tree class, tree fields, tree super_name) 801{ 802 tree name = CLASS_NAME (class); 803 tree s = start_struct (RECORD_TYPE, name); 804 tree super = (super_name ? xref_tag (RECORD_TYPE, super_name) : NULL_TREE); 805 tree t, objc_info = NULL_TREE; 806 807 if (super) 808 { 809 /* Prepend a packed variant of the base class into the layout. This 810 is necessary to preserve ObjC ABI compatibility. */ 811 tree base = build_decl (FIELD_DECL, NULL_TREE, super); 812 tree field = TYPE_FIELDS (super); 813 814 while (field && TREE_CHAIN (field) 815 && TREE_CODE (TREE_CHAIN (field)) == FIELD_DECL) 816 field = TREE_CHAIN (field); 817 818 /* For ObjC ABI purposes, the "packed" size of a base class is the 819 the sum of the offset and the size (in bits) of the last field 820 in the class. */ 821 DECL_SIZE (base) 822 = (field && TREE_CODE (field) == FIELD_DECL 823 ? size_binop (PLUS_EXPR, 824 size_binop (PLUS_EXPR, 825 size_binop 826 (MULT_EXPR, 827 convert (bitsizetype, 828 DECL_FIELD_OFFSET (field)), 829 bitsize_int (BITS_PER_UNIT)), 830 DECL_FIELD_BIT_OFFSET (field)), 831 DECL_SIZE (field)) 832 : bitsize_zero_node); 833 DECL_SIZE_UNIT (base) 834 = size_binop (FLOOR_DIV_EXPR, convert (sizetype, DECL_SIZE (base)), 835 size_int (BITS_PER_UNIT)); 836 DECL_ARTIFICIAL (base) = 1; 837 DECL_ALIGN (base) = 1; 838 DECL_FIELD_CONTEXT (base) = s; 839#ifdef OBJCPLUS 840 DECL_FIELD_IS_BASE (base) = 1; 841 842 if (fields) 843 TREE_NO_WARNING (fields) = 1; /* Suppress C++ ABI warnings -- we */ 844#endif /* are following the ObjC ABI here. */ 845 TREE_CHAIN (base) = fields; 846 fields = base; 847 } 848 849 /* NB: Calling finish_struct() may cause type TYPE_LANG_SPECIFIC fields 850 in all variants of this RECORD_TYPE to be clobbered, but it is therein 851 that we store protocol conformance info (e.g., 'NSObject <MyProtocol>'). 852 Hence, we must squirrel away the ObjC-specific information before calling 853 finish_struct(), and then reinstate it afterwards. */ 854 855 for (t = TYPE_NEXT_VARIANT (s); t; t = TYPE_NEXT_VARIANT (t)) 856 objc_info 857 = chainon (objc_info, 858 build_tree_list (NULL_TREE, TYPE_OBJC_INFO (t))); 859 860 /* Point the struct at its related Objective-C class. */ 861 INIT_TYPE_OBJC_INFO (s); 862 TYPE_OBJC_INTERFACE (s) = class; 863 864 s = finish_struct (s, fields, NULL_TREE); 865 866 for (t = TYPE_NEXT_VARIANT (s); t; 867 t = TYPE_NEXT_VARIANT (t), objc_info = TREE_CHAIN (objc_info)) 868 { 869 TYPE_OBJC_INFO (t) = TREE_VALUE (objc_info); 870 /* Replace the IDENTIFIER_NODE with an actual @interface. */ 871 TYPE_OBJC_INTERFACE (t) = class; 872 } 873 874 /* Use TYPE_BINFO structures to point at the super class, if any. */ 875 objc_xref_basetypes (s, super); 876 877 /* Mark this struct as a class template. */ 878 CLASS_STATIC_TEMPLATE (class) = s; 879 880 return s; 881} 882 883/* Build a type differing from TYPE only in that TYPE_VOLATILE is set. 884 Unlike tree.c:build_qualified_type(), preserve TYPE_LANG_SPECIFIC in the 885 process. */ 886static tree 887objc_build_volatilized_type (tree type) 888{ 889 tree t; 890 891 /* Check if we have not constructed the desired variant already. */ 892 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) 893 { 894 /* The type qualifiers must (obviously) match up. */ 895 if (!TYPE_VOLATILE (t) 896 || (TYPE_READONLY (t) != TYPE_READONLY (type)) 897 || (TYPE_RESTRICT (t) != TYPE_RESTRICT (type))) 898 continue; 899 900 /* For pointer types, the pointees (and hence their TYPE_LANG_SPECIFIC 901 info, if any) must match up. */ 902 if (POINTER_TYPE_P (t) 903 && (TREE_TYPE (t) != TREE_TYPE (type))) 904 continue; 905 906 /* Everything matches up! */ 907 return t; 908 } 909 910 /* Ok, we could not re-use any of the pre-existing variants. Create 911 a new one. */ 912 t = build_variant_type_copy (type); 913 TYPE_VOLATILE (t) = 1; 914 915 return t; 916} 917 918/* Mark DECL as being 'volatile' for purposes of Darwin 919 _setjmp()/_longjmp() exception handling. Called from 920 objc_mark_locals_volatile(). */ 921void 922objc_volatilize_decl (tree decl) 923{ 924 /* Do not mess with variables that are 'static' or (already) 925 'volatile'. */ 926 if (!TREE_THIS_VOLATILE (decl) && !TREE_STATIC (decl) 927 && (TREE_CODE (decl) == VAR_DECL 928 || TREE_CODE (decl) == PARM_DECL)) 929 { 930 tree t = TREE_TYPE (decl); 931 struct volatilized_type key; 932 void **loc; 933 934 t = objc_build_volatilized_type (t); 935 key.type = t; 936 loc = htab_find_slot (volatilized_htab, &key, INSERT); 937 938 if (!*loc) 939 { 940 *loc = ggc_alloc (sizeof (key)); 941 ((struct volatilized_type *) *loc)->type = t; 942 } 943 944 TREE_TYPE (decl) = t; 945 TREE_THIS_VOLATILE (decl) = 1; 946 TREE_SIDE_EFFECTS (decl) = 1; 947 DECL_REGISTER (decl) = 0; 948#ifndef OBJCPLUS 949 C_DECL_REGISTER (decl) = 0; 950#endif 951 } 952} 953 954/* Check if protocol PROTO is adopted (directly or indirectly) by class CLS 955 (including its categoreis and superclasses) or by object type TYP. 956 Issue a warning if PROTO is not adopted anywhere and WARN is set. */ 957 958static bool 959objc_lookup_protocol (tree proto, tree cls, tree typ, bool warn) 960{ 961 bool class_type = (cls != NULL_TREE); 962 963 while (cls) 964 { 965 tree c; 966 967 /* Check protocols adopted by the class and its categories. */ 968 for (c = cls; c; c = CLASS_CATEGORY_LIST (c)) 969 { 970 if (lookup_protocol_in_reflist (CLASS_PROTOCOL_LIST (c), proto)) 971 return true; 972 } 973 974 /* Repeat for superclasses. */ 975 cls = lookup_interface (CLASS_SUPER_NAME (cls)); 976 } 977 978 /* Check for any protocols attached directly to the object type. */ 979 if (TYPE_HAS_OBJC_INFO (typ)) 980 { 981 if (lookup_protocol_in_reflist (TYPE_OBJC_PROTOCOL_LIST (typ), proto)) 982 return true; 983 } 984 985 if (warn) 986 { 987 strcpy (errbuf, class_type ? "class \'" : "type \'"); 988 gen_type_name_0 (class_type ? typ : TYPE_POINTER_TO (typ)); 989 strcat (errbuf, "\' does not "); 990 /* NB: Types 'id' and 'Class' cannot reasonably be described as 991 "implementing" a given protocol, since they do not have an 992 implementation. */ 993 strcat (errbuf, class_type ? "implement" : "conform to"); 994 strcat (errbuf, " the \'"); 995 strcat (errbuf, IDENTIFIER_POINTER (PROTOCOL_NAME (proto))); 996 strcat (errbuf, "\' protocol"); 997 warning (0, errbuf); 998 } 999 1000 return false; 1001} 1002 1003/* Check if class RCLS and instance struct type RTYP conform to at least the 1004 same protocols that LCLS and LTYP conform to. */ 1005 1006static bool 1007objc_compare_protocols (tree lcls, tree ltyp, tree rcls, tree rtyp, bool warn) 1008{ 1009 tree p; 1010 bool have_lproto = false; 1011 1012 while (lcls) 1013 { 1014 /* NB: We do _not_ look at categories defined for LCLS; these may or 1015 may not get loaded in, and therefore it is unreasonable to require 1016 that RCLS/RTYP must implement any of their protocols. */ 1017 for (p = CLASS_PROTOCOL_LIST (lcls); p; p = TREE_CHAIN (p)) 1018 { 1019 have_lproto = true; 1020 1021 if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn)) 1022 return warn; 1023 } 1024 1025 /* Repeat for superclasses. */ 1026 lcls = lookup_interface (CLASS_SUPER_NAME (lcls)); 1027 } 1028 1029 /* Check for any protocols attached directly to the object type. */ 1030 if (TYPE_HAS_OBJC_INFO (ltyp)) 1031 { 1032 for (p = TYPE_OBJC_PROTOCOL_LIST (ltyp); p; p = TREE_CHAIN (p)) 1033 { 1034 have_lproto = true; 1035 1036 if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn)) 1037 return warn; 1038 } 1039 } 1040 1041 /* NB: If LTYP and LCLS have no protocols to search for, return 'true' 1042 vacuously, _unless_ RTYP is a protocol-qualified 'id'. We can get 1043 away with simply checking for 'id' or 'Class' (!RCLS), since this 1044 routine will not get called in other cases. */ 1045 return have_lproto || (rcls != NULL_TREE); 1046} 1047 1048/* Determine if it is permissible to assign (if ARGNO is greater than -3) 1049 an instance of RTYP to an instance of LTYP or to compare the two 1050 (if ARGNO is equal to -3), per ObjC type system rules. Before 1051 returning 'true', this routine may issue warnings related to, e.g., 1052 protocol conformance. When returning 'false', the routine must 1053 produce absolutely no warnings; the C or C++ front-end will do so 1054 instead, if needed. If either LTYP or RTYP is not an Objective-C type, 1055 the routine must return 'false'. 1056 1057 The ARGNO parameter is encoded as follows: 1058 >= 1 Parameter number (CALLEE contains function being called); 1059 0 Return value; 1060 -1 Assignment; 1061 -2 Initialization; 1062 -3 Comparison (LTYP and RTYP may match in either direction). */ 1063 1064bool 1065objc_compare_types (tree ltyp, tree rtyp, int argno, tree callee) 1066{ 1067 tree lcls, rcls, lproto, rproto; 1068 bool pointers_compatible; 1069 1070 /* We must be dealing with pointer types */ 1071 if (!POINTER_TYPE_P (ltyp) || !POINTER_TYPE_P (rtyp)) 1072 return false; 1073 1074 do 1075 { 1076 ltyp = TREE_TYPE (ltyp); /* Remove indirections. */ 1077 rtyp = TREE_TYPE (rtyp); 1078 } 1079 while (POINTER_TYPE_P (ltyp) && POINTER_TYPE_P (rtyp)); 1080 1081 /* Past this point, we are only interested in ObjC class instances, 1082 or 'id' or 'Class'. */ 1083 if (TREE_CODE (ltyp) != RECORD_TYPE || TREE_CODE (rtyp) != RECORD_TYPE) 1084 return false; 1085 1086 if (!objc_is_object_id (ltyp) && !objc_is_class_id (ltyp) 1087 && !TYPE_HAS_OBJC_INFO (ltyp)) 1088 return false; 1089 1090 if (!objc_is_object_id (rtyp) && !objc_is_class_id (rtyp) 1091 && !TYPE_HAS_OBJC_INFO (rtyp)) 1092 return false; 1093 1094 /* Past this point, we are committed to returning 'true' to the caller. 1095 However, we can still warn about type and/or protocol mismatches. */ 1096 1097 if (TYPE_HAS_OBJC_INFO (ltyp)) 1098 { 1099 lcls = TYPE_OBJC_INTERFACE (ltyp); 1100 lproto = TYPE_OBJC_PROTOCOL_LIST (ltyp); 1101 } 1102 else 1103 lcls = lproto = NULL_TREE; 1104 1105 if (TYPE_HAS_OBJC_INFO (rtyp)) 1106 { 1107 rcls = TYPE_OBJC_INTERFACE (rtyp); 1108 rproto = TYPE_OBJC_PROTOCOL_LIST (rtyp); 1109 } 1110 else 1111 rcls = rproto = NULL_TREE; 1112 1113 /* If we could not find an @interface declaration, we must have 1114 only seen a @class declaration; for purposes of type comparison, 1115 treat it as a stand-alone (root) class. */ 1116 1117 if (lcls && TREE_CODE (lcls) == IDENTIFIER_NODE) 1118 lcls = NULL_TREE; 1119 1120 if (rcls && TREE_CODE (rcls) == IDENTIFIER_NODE) 1121 rcls = NULL_TREE; 1122 1123 /* If either type is an unqualified 'id', we're done. */ 1124 if ((!lproto && objc_is_object_id (ltyp)) 1125 || (!rproto && objc_is_object_id (rtyp))) 1126 return true; 1127 1128 pointers_compatible = (TYPE_MAIN_VARIANT (ltyp) == TYPE_MAIN_VARIANT (rtyp)); 1129 1130 /* If the underlying types are the same, and at most one of them has 1131 a protocol list, we do not need to issue any diagnostics. */ 1132 if (pointers_compatible && (!lproto || !rproto)) 1133 return true; 1134 1135 /* If exactly one of the types is 'Class', issue a diagnostic; any 1136 exceptions of this rule have already been handled. */ 1137 if (objc_is_class_id (ltyp) ^ objc_is_class_id (rtyp)) 1138 pointers_compatible = false; 1139 /* Otherwise, check for inheritance relations. */ 1140 else 1141 { 1142 if (!pointers_compatible) 1143 pointers_compatible 1144 = (objc_is_object_id (ltyp) || objc_is_object_id (rtyp)); 1145 1146 if (!pointers_compatible) 1147 pointers_compatible = DERIVED_FROM_P (ltyp, rtyp); 1148 1149 if (!pointers_compatible && argno == -3) 1150 pointers_compatible = DERIVED_FROM_P (rtyp, ltyp); 1151 } 1152 1153 /* If the pointers match modulo protocols, check for protocol conformance 1154 mismatches. */ 1155 if (pointers_compatible) 1156 { 1157 pointers_compatible = objc_compare_protocols (lcls, ltyp, rcls, rtyp, 1158 argno != -3); 1159 1160 if (!pointers_compatible && argno == -3) 1161 pointers_compatible = objc_compare_protocols (rcls, rtyp, lcls, ltyp, 1162 argno != -3); 1163 } 1164 1165 if (!pointers_compatible) 1166 { 1167 /* NB: For the time being, we shall make our warnings look like their 1168 C counterparts. In the future, we may wish to make them more 1169 ObjC-specific. */ 1170 switch (argno) 1171 { 1172 case -3: 1173 warning (0, "comparison of distinct Objective-C types lacks a cast"); 1174 break; 1175 1176 case -2: 1177 warning (0, "initialization from distinct Objective-C type"); 1178 break; 1179 1180 case -1: 1181 warning (0, "assignment from distinct Objective-C type"); 1182 break; 1183 1184 case 0: 1185 warning (0, "distinct Objective-C type in return"); 1186 break; 1187 1188 default: 1189 warning (0, "passing argument %d of %qE from distinct " 1190 "Objective-C type", argno, callee); 1191 break; 1192 } 1193 } 1194 1195 return true; 1196} 1197 1198/* Check if LTYP and RTYP have the same type qualifiers. If either type 1199 lives in the volatilized hash table, ignore the 'volatile' bit when 1200 making the comparison. */ 1201 1202bool 1203objc_type_quals_match (tree ltyp, tree rtyp) 1204{ 1205 int lquals = TYPE_QUALS (ltyp), rquals = TYPE_QUALS (rtyp); 1206 struct volatilized_type key; 1207 1208 key.type = ltyp; 1209 1210 if (htab_find_slot (volatilized_htab, &key, NO_INSERT)) 1211 lquals &= ~TYPE_QUAL_VOLATILE; 1212 1213 key.type = rtyp; 1214 1215 if (htab_find_slot (volatilized_htab, &key, NO_INSERT)) 1216 rquals &= ~TYPE_QUAL_VOLATILE; 1217 1218 return (lquals == rquals); 1219} 1220 1221#ifndef OBJCPLUS 1222/* Determine if CHILD is derived from PARENT. The routine assumes that 1223 both parameters are RECORD_TYPEs, and is non-reflexive. */ 1224 1225static bool 1226objc_derived_from_p (tree parent, tree child) 1227{ 1228 parent = TYPE_MAIN_VARIANT (parent); 1229 1230 for (child = TYPE_MAIN_VARIANT (child); 1231 TYPE_BINFO (child) && BINFO_N_BASE_BINFOS (TYPE_BINFO (child));) 1232 { 1233 child = TYPE_MAIN_VARIANT (BINFO_TYPE (BINFO_BASE_BINFO 1234 (TYPE_BINFO (child), 1235 0))); 1236 1237 if (child == parent) 1238 return true; 1239 } 1240 1241 return false; 1242} 1243#endif 1244 1245static tree 1246objc_build_component_ref (tree datum, tree component) 1247{ 1248 /* If COMPONENT is NULL, the caller is referring to the anonymous 1249 base class field. */ 1250 if (!component) 1251 { 1252 tree base = TYPE_FIELDS (TREE_TYPE (datum)); 1253 1254 return build3 (COMPONENT_REF, TREE_TYPE (base), datum, base, NULL_TREE); 1255 } 1256 1257 /* The 'build_component_ref' routine has been removed from the C++ 1258 front-end, but 'finish_class_member_access_expr' seems to be 1259 a worthy substitute. */ 1260#ifdef OBJCPLUS 1261 return finish_class_member_access_expr (datum, component, false); 1262#else 1263 return build_component_ref (datum, component); 1264#endif 1265} 1266 1267/* Recursively copy inheritance information rooted at BINFO. To do this, 1268 we emulate the song and dance performed by cp/tree.c:copy_binfo(). */ 1269 1270static tree 1271objc_copy_binfo (tree binfo) 1272{ 1273 tree btype = BINFO_TYPE (binfo); 1274 tree binfo2 = make_tree_binfo (BINFO_N_BASE_BINFOS (binfo)); 1275 tree base_binfo; 1276 int ix; 1277 1278 BINFO_TYPE (binfo2) = btype; 1279 BINFO_OFFSET (binfo2) = BINFO_OFFSET (binfo); 1280 BINFO_BASE_ACCESSES (binfo2) = BINFO_BASE_ACCESSES (binfo); 1281 1282 /* Recursively copy base binfos of BINFO. */ 1283 for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) 1284 { 1285 tree base_binfo2 = objc_copy_binfo (base_binfo); 1286 1287 BINFO_INHERITANCE_CHAIN (base_binfo2) = binfo2; 1288 BINFO_BASE_APPEND (binfo2, base_binfo2); 1289 } 1290 1291 return binfo2; 1292} 1293 1294/* Record superclass information provided in BASETYPE for ObjC class REF. 1295 This is loosely based on cp/decl.c:xref_basetypes(). */ 1296 1297static void 1298objc_xref_basetypes (tree ref, tree basetype) 1299{ 1300 tree binfo = make_tree_binfo (basetype ? 1 : 0); 1301 1302 TYPE_BINFO (ref) = binfo; 1303 BINFO_OFFSET (binfo) = size_zero_node; 1304 BINFO_TYPE (binfo) = ref; 1305 1306 if (basetype) 1307 { 1308 tree base_binfo = objc_copy_binfo (TYPE_BINFO (basetype)); 1309 1310 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo; 1311 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, 1); 1312 BINFO_BASE_APPEND (binfo, base_binfo); 1313 BINFO_BASE_ACCESS_APPEND (binfo, access_public_node); 1314 } 1315} 1316 1317static hashval_t 1318volatilized_hash (const void *ptr) 1319{ 1320 tree typ = ((struct volatilized_type *)ptr)->type; 1321 1322 return htab_hash_pointer(typ); 1323} 1324 1325static int 1326volatilized_eq (const void *ptr1, const void *ptr2) 1327{ 1328 tree typ1 = ((struct volatilized_type *)ptr1)->type; 1329 tree typ2 = ((struct volatilized_type *)ptr2)->type; 1330 1331 return typ1 == typ2; 1332} 1333 1334/* Called from finish_decl. */ 1335 1336void 1337objc_check_decl (tree decl) 1338{ 1339 tree type = TREE_TYPE (decl); 1340 1341 if (TREE_CODE (type) != RECORD_TYPE) 1342 return; 1343 if (OBJC_TYPE_NAME (type) && (type = objc_is_class_name (OBJC_TYPE_NAME (type)))) 1344 error ("statically allocated instance of Objective-C class %qs", 1345 IDENTIFIER_POINTER (type)); 1346} 1347 1348/* Construct a PROTOCOLS-qualified variant of INTERFACE, where INTERFACE may 1349 either name an Objective-C class, or refer to the special 'id' or 'Class' 1350 types. If INTERFACE is not a valid ObjC type, just return it unchanged. */ 1351 1352tree 1353objc_get_protocol_qualified_type (tree interface, tree protocols) 1354{ 1355 /* If INTERFACE is not provided, default to 'id'. */ 1356 tree type = (interface ? objc_is_id (interface) : objc_object_type); 1357 bool is_ptr = (type != NULL_TREE); 1358 1359 if (!is_ptr) 1360 { 1361 type = objc_is_class_name (interface); 1362 1363 if (type) 1364 type = xref_tag (RECORD_TYPE, type); 1365 else 1366 return interface; 1367 } 1368 1369 if (protocols) 1370 { 1371 type = build_variant_type_copy (type); 1372 1373 /* For pointers (i.e., 'id' or 'Class'), attach the protocol(s) 1374 to the pointee. */ 1375 if (is_ptr) 1376 { 1377 TREE_TYPE (type) = build_variant_type_copy (TREE_TYPE (type)); 1378 TYPE_POINTER_TO (TREE_TYPE (type)) = type; 1379 type = TREE_TYPE (type); 1380 } 1381 1382 /* Look up protocols and install in lang specific list. */ 1383 DUP_TYPE_OBJC_INFO (type, TYPE_MAIN_VARIANT (type)); 1384 TYPE_OBJC_PROTOCOL_LIST (type) = lookup_and_install_protocols (protocols); 1385 1386 /* For RECORD_TYPEs, point to the @interface; for 'id' and 'Class', 1387 return the pointer to the new pointee variant. */ 1388 if (is_ptr) 1389 type = TYPE_POINTER_TO (type); 1390 else 1391 TYPE_OBJC_INTERFACE (type) 1392 = TYPE_OBJC_INTERFACE (TYPE_MAIN_VARIANT (type)); 1393 } 1394 1395 return type; 1396} 1397 1398/* Check for circular dependencies in protocols. The arguments are 1399 PROTO, the protocol to check, and LIST, a list of protocol it 1400 conforms to. */ 1401 1402static void 1403check_protocol_recursively (tree proto, tree list) 1404{ 1405 tree p; 1406 1407 for (p = list; p; p = TREE_CHAIN (p)) 1408 { 1409 tree pp = TREE_VALUE (p); 1410 1411 if (TREE_CODE (pp) == IDENTIFIER_NODE) 1412 pp = lookup_protocol (pp); 1413 1414 if (pp == proto) 1415 fatal_error ("protocol %qs has circular dependency", 1416 IDENTIFIER_POINTER (PROTOCOL_NAME (pp))); 1417 if (pp) 1418 check_protocol_recursively (proto, PROTOCOL_LIST (pp)); 1419 } 1420} 1421 1422/* Look up PROTOCOLS, and return a list of those that are found. 1423 If none are found, return NULL. */ 1424 1425static tree 1426lookup_and_install_protocols (tree protocols) 1427{ 1428 tree proto; 1429 tree return_value = NULL_TREE; 1430 1431 for (proto = protocols; proto; proto = TREE_CHAIN (proto)) 1432 { 1433 tree ident = TREE_VALUE (proto); 1434 tree p = lookup_protocol (ident); 1435 1436 if (p) 1437 return_value = chainon (return_value, 1438 build_tree_list (NULL_TREE, p)); 1439 else if (ident != error_mark_node) 1440 error ("cannot find protocol declaration for %qs", 1441 IDENTIFIER_POINTER (ident)); 1442 } 1443 1444 return return_value; 1445} 1446 1447/* Create a declaration for field NAME of a given TYPE. */ 1448 1449static tree 1450create_field_decl (tree type, const char *name) 1451{ 1452 return build_decl (FIELD_DECL, get_identifier (name), type); 1453} 1454 1455/* Create a global, static declaration for variable NAME of a given TYPE. The 1456 finish_var_decl() routine will need to be called on it afterwards. */ 1457 1458static tree 1459start_var_decl (tree type, const char *name) 1460{ 1461 tree var = build_decl (VAR_DECL, get_identifier (name), type); 1462 1463 TREE_STATIC (var) = 1; 1464 DECL_INITIAL (var) = error_mark_node; /* A real initializer is coming... */ 1465 DECL_IGNORED_P (var) = 1; 1466 DECL_ARTIFICIAL (var) = 1; 1467 DECL_CONTEXT (var) = NULL_TREE; 1468#ifdef OBJCPLUS 1469 DECL_THIS_STATIC (var) = 1; /* squash redeclaration errors */ 1470#endif 1471 1472 return var; 1473} 1474 1475/* Finish off the variable declaration created by start_var_decl(). */ 1476 1477static void 1478finish_var_decl (tree var, tree initializer) 1479{ 1480 finish_decl (var, initializer, NULL_TREE); 1481 /* Ensure that the variable actually gets output. */ 1482 mark_decl_referenced (var); 1483 /* Mark the decl to avoid "defined but not used" warning. */ 1484 TREE_USED (var) = 1; 1485} 1486 1487/* Find the decl for the constant string class reference. This is only 1488 used for the NeXT runtime. */ 1489 1490static tree 1491setup_string_decl (void) 1492{ 1493 char *name; 1494 size_t length; 1495 1496 /* %s in format will provide room for terminating null */ 1497 length = strlen (STRING_OBJECT_GLOBAL_FORMAT) 1498 + strlen (constant_string_class_name); 1499 name = xmalloc (length); 1500 sprintf (name, STRING_OBJECT_GLOBAL_FORMAT, 1501 constant_string_class_name); 1502 constant_string_global_id = get_identifier (name); 1503 string_class_decl = lookup_name (constant_string_global_id); 1504 1505 return string_class_decl; 1506} 1507 1508/* Purpose: "play" parser, creating/installing representations 1509 of the declarations that are required by Objective-C. 1510 1511 Model: 1512 1513 type_spec--------->sc_spec 1514 (tree_list) (tree_list) 1515 | | 1516 | | 1517 identifier_node identifier_node */ 1518 1519static void 1520synth_module_prologue (void) 1521{ 1522 tree type; 1523 enum debug_info_type save_write_symbols = write_symbols; 1524 const struct gcc_debug_hooks *const save_hooks = debug_hooks; 1525 1526 /* Suppress outputting debug symbols, because 1527 dbxout_init hasn'r been called yet. */ 1528 write_symbols = NO_DEBUG; 1529 debug_hooks = &do_nothing_debug_hooks; 1530 1531#ifdef OBJCPLUS 1532 push_lang_context (lang_name_c); /* extern "C" */ 1533#endif 1534 1535 /* The following are also defined in <objc/objc.h> and friends. */ 1536 1537 objc_object_id = get_identifier (TAG_OBJECT); 1538 objc_class_id = get_identifier (TAG_CLASS); 1539 1540 objc_object_reference = xref_tag (RECORD_TYPE, objc_object_id); 1541 objc_class_reference = xref_tag (RECORD_TYPE, objc_class_id); 1542 1543 objc_object_type = build_pointer_type (objc_object_reference); 1544 objc_class_type = build_pointer_type (objc_class_reference); 1545 1546 objc_object_name = get_identifier (OBJECT_TYPEDEF_NAME); 1547 objc_class_name = get_identifier (CLASS_TYPEDEF_NAME); 1548 1549 /* Declare the 'id' and 'Class' typedefs. */ 1550 1551 type = lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, 1552 objc_object_name, 1553 objc_object_type)); 1554 DECL_IN_SYSTEM_HEADER (type) = 1; 1555 type = lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, 1556 objc_class_name, 1557 objc_class_type)); 1558 DECL_IN_SYSTEM_HEADER (type) = 1; 1559 1560 /* Forward-declare '@interface Protocol'. */ 1561 1562 type = get_identifier (PROTOCOL_OBJECT_CLASS_NAME); 1563 objc_declare_class (tree_cons (NULL_TREE, type, NULL_TREE)); 1564 objc_protocol_type = build_pointer_type (xref_tag (RECORD_TYPE, 1565 type)); 1566 1567 /* Declare type of selector-objects that represent an operation name. */ 1568 1569 if (flag_next_runtime) 1570 /* `struct objc_selector *' */ 1571 objc_selector_type 1572 = build_pointer_type (xref_tag (RECORD_TYPE, 1573 get_identifier (TAG_SELECTOR))); 1574 else 1575 /* `const struct objc_selector *' */ 1576 objc_selector_type 1577 = build_pointer_type 1578 (build_qualified_type (xref_tag (RECORD_TYPE, 1579 get_identifier (TAG_SELECTOR)), 1580 TYPE_QUAL_CONST)); 1581 1582 /* Declare receiver type used for dispatching messages to 'super'. */ 1583 1584 /* `struct objc_super *' */ 1585 objc_super_type = build_pointer_type (xref_tag (RECORD_TYPE, 1586 get_identifier (TAG_SUPER))); 1587 1588 /* Declare pointers to method and ivar lists. */ 1589 objc_method_list_ptr = build_pointer_type 1590 (xref_tag (RECORD_TYPE, 1591 get_identifier (UTAG_METHOD_LIST))); 1592 objc_method_proto_list_ptr 1593 = build_pointer_type (xref_tag (RECORD_TYPE, 1594 get_identifier (UTAG_METHOD_PROTOTYPE_LIST))); 1595 objc_ivar_list_ptr = build_pointer_type 1596 (xref_tag (RECORD_TYPE, 1597 get_identifier (UTAG_IVAR_LIST))); 1598 1599 /* TREE_NOTHROW is cleared for the message-sending functions, 1600 because the function that gets called can throw in Obj-C++, or 1601 could itself call something that can throw even in Obj-C. */ 1602 1603 if (flag_next_runtime) 1604 { 1605 /* NB: In order to call one of the ..._stret (struct-returning) 1606 functions, the function *MUST* first be cast to a signature that 1607 corresponds to the actual ObjC method being invoked. This is 1608 what is done by the build_objc_method_call() routine below. */ 1609 1610 /* id objc_msgSend (id, SEL, ...); */ 1611 /* id objc_msgSendNonNil (id, SEL, ...); */ 1612 /* id objc_msgSend_stret (id, SEL, ...); */ 1613 /* id objc_msgSendNonNil_stret (id, SEL, ...); */ 1614 type 1615 = build_function_type (objc_object_type, 1616 tree_cons (NULL_TREE, objc_object_type, 1617 tree_cons (NULL_TREE, objc_selector_type, 1618 NULL_TREE))); 1619 umsg_decl = builtin_function (TAG_MSGSEND, 1620 type, 0, NOT_BUILT_IN, 1621 NULL, NULL_TREE); 1622 umsg_nonnil_decl = builtin_function (TAG_MSGSEND_NONNIL, 1623 type, 0, NOT_BUILT_IN, 1624 NULL, NULL_TREE); 1625 umsg_stret_decl = builtin_function (TAG_MSGSEND_STRET, 1626 type, 0, NOT_BUILT_IN, 1627 NULL, NULL_TREE); 1628 umsg_nonnil_stret_decl = builtin_function (TAG_MSGSEND_NONNIL_STRET, 1629 type, 0, NOT_BUILT_IN, 1630 NULL, NULL_TREE); 1631 1632 /* These can throw, because the function that gets called can throw 1633 in Obj-C++, or could itself call something that can throw even 1634 in Obj-C. */ 1635 TREE_NOTHROW (umsg_decl) = 0; 1636 TREE_NOTHROW (umsg_nonnil_decl) = 0; 1637 TREE_NOTHROW (umsg_stret_decl) = 0; 1638 TREE_NOTHROW (umsg_nonnil_stret_decl) = 0; 1639 1640 /* id objc_msgSend_Fast (id, SEL, ...) 1641 __attribute__ ((hard_coded_address (OFFS_MSGSEND_FAST))); */ 1642#ifdef OFFS_MSGSEND_FAST 1643 umsg_fast_decl = builtin_function (TAG_MSGSEND_FAST, 1644 type, 0, NOT_BUILT_IN, 1645 NULL, NULL_TREE); 1646 TREE_NOTHROW (umsg_fast_decl) = 0; 1647 DECL_ATTRIBUTES (umsg_fast_decl) 1648 = tree_cons (get_identifier ("hard_coded_address"), 1649 build_int_cst (NULL_TREE, OFFS_MSGSEND_FAST), 1650 NULL_TREE); 1651#else 1652 /* No direct dispatch availible. */ 1653 umsg_fast_decl = umsg_decl; 1654#endif 1655 1656 /* id objc_msgSendSuper (struct objc_super *, SEL, ...); */ 1657 /* id objc_msgSendSuper_stret (struct objc_super *, SEL, ...); */ 1658 type 1659 = build_function_type (objc_object_type, 1660 tree_cons (NULL_TREE, objc_super_type, 1661 tree_cons (NULL_TREE, objc_selector_type, 1662 NULL_TREE))); 1663 umsg_super_decl = builtin_function (TAG_MSGSENDSUPER, 1664 type, 0, NOT_BUILT_IN, 1665 NULL, NULL_TREE); 1666 umsg_super_stret_decl = builtin_function (TAG_MSGSENDSUPER_STRET, 1667 type, 0, NOT_BUILT_IN, 0, 1668 NULL_TREE); 1669 TREE_NOTHROW (umsg_super_decl) = 0; 1670 TREE_NOTHROW (umsg_super_stret_decl) = 0; 1671 } 1672 else 1673 { 1674 /* GNU runtime messenger entry points. */ 1675 1676 /* typedef id (*IMP)(id, SEL, ...); */ 1677 tree IMP_type 1678 = build_pointer_type 1679 (build_function_type (objc_object_type, 1680 tree_cons (NULL_TREE, objc_object_type, 1681 tree_cons (NULL_TREE, objc_selector_type, 1682 NULL_TREE)))); 1683 1684 /* IMP objc_msg_lookup (id, SEL); */ 1685 type 1686 = build_function_type (IMP_type, 1687 tree_cons (NULL_TREE, objc_object_type, 1688 tree_cons (NULL_TREE, objc_selector_type, 1689 OBJC_VOID_AT_END))); 1690 umsg_decl = builtin_function (TAG_MSGSEND, 1691 type, 0, NOT_BUILT_IN, 1692 NULL, NULL_TREE); 1693 TREE_NOTHROW (umsg_decl) = 0; 1694 1695 /* IMP objc_msg_lookup_super (struct objc_super *, SEL); */ 1696 type 1697 = build_function_type (IMP_type, 1698 tree_cons (NULL_TREE, objc_super_type, 1699 tree_cons (NULL_TREE, objc_selector_type, 1700 OBJC_VOID_AT_END))); 1701 umsg_super_decl = builtin_function (TAG_MSGSENDSUPER, 1702 type, 0, NOT_BUILT_IN, 1703 NULL, NULL_TREE); 1704 TREE_NOTHROW (umsg_super_decl) = 0; 1705 1706 /* The following GNU runtime entry point is called to initialize 1707 each module: 1708 1709 __objc_exec_class (void *); */ 1710 type 1711 = build_function_type (void_type_node, 1712 tree_cons (NULL_TREE, ptr_type_node, 1713 OBJC_VOID_AT_END)); 1714 execclass_decl = builtin_function (TAG_EXECCLASS, 1715 type, 0, NOT_BUILT_IN, 1716 NULL, NULL_TREE); 1717 } 1718 1719 /* id objc_getClass (const char *); */ 1720 1721 type = build_function_type (objc_object_type, 1722 tree_cons (NULL_TREE, 1723 const_string_type_node, 1724 OBJC_VOID_AT_END)); 1725 1726 objc_get_class_decl 1727 = builtin_function (TAG_GETCLASS, type, 0, NOT_BUILT_IN, 1728 NULL, NULL_TREE); 1729 1730 /* id objc_getMetaClass (const char *); */ 1731 1732 objc_get_meta_class_decl 1733 = builtin_function (TAG_GETMETACLASS, type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 1734 1735 build_class_template (); 1736 build_super_template (); 1737 build_protocol_template (); 1738 build_category_template (); 1739 build_objc_exception_stuff (); 1740 1741 if (flag_next_runtime) 1742 build_next_objc_exception_stuff (); 1743 1744 /* static SEL _OBJC_SELECTOR_TABLE[]; */ 1745 1746 if (! flag_next_runtime) 1747 build_selector_table_decl (); 1748 1749 /* Forward declare constant_string_id and constant_string_type. */ 1750 if (!constant_string_class_name) 1751 constant_string_class_name = default_constant_string_class_name; 1752 1753 constant_string_id = get_identifier (constant_string_class_name); 1754 objc_declare_class (tree_cons (NULL_TREE, constant_string_id, NULL_TREE)); 1755 1756 /* Pre-build the following entities - for speed/convenience. */ 1757 self_id = get_identifier ("self"); 1758 ucmd_id = get_identifier ("_cmd"); 1759 1760#ifdef OBJCPLUS 1761 pop_lang_context (); 1762#endif 1763 1764 write_symbols = save_write_symbols; 1765 debug_hooks = save_hooks; 1766} 1767 1768/* Ensure that the ivar list for NSConstantString/NXConstantString 1769 (or whatever was specified via `-fconstant-string-class') 1770 contains fields at least as large as the following three, so that 1771 the runtime can stomp on them with confidence: 1772 1773 struct STRING_OBJECT_CLASS_NAME 1774 { 1775 Object isa; 1776 char *cString; 1777 unsigned int length; 1778 }; */ 1779 1780static int 1781check_string_class_template (void) 1782{ 1783 tree field_decl = objc_get_class_ivars (constant_string_id); 1784 1785#define AT_LEAST_AS_LARGE_AS(F, T) \ 1786 (F && TREE_CODE (F) == FIELD_DECL \ 1787 && (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (F))) \ 1788 >= TREE_INT_CST_LOW (TYPE_SIZE (T)))) 1789 1790 if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node)) 1791 return 0; 1792 1793 field_decl = TREE_CHAIN (field_decl); 1794 if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node)) 1795 return 0; 1796 1797 field_decl = TREE_CHAIN (field_decl); 1798 return AT_LEAST_AS_LARGE_AS (field_decl, unsigned_type_node); 1799 1800#undef AT_LEAST_AS_LARGE_AS 1801} 1802 1803/* Avoid calling `check_string_class_template ()' more than once. */ 1804static GTY(()) int string_layout_checked; 1805 1806/* Construct an internal string layout to be used as a template for 1807 creating NSConstantString/NXConstantString instances. */ 1808 1809static tree 1810objc_build_internal_const_str_type (void) 1811{ 1812 tree type = (*lang_hooks.types.make_type) (RECORD_TYPE); 1813 tree fields = build_decl (FIELD_DECL, NULL_TREE, ptr_type_node); 1814 tree field = build_decl (FIELD_DECL, NULL_TREE, ptr_type_node); 1815 1816 TREE_CHAIN (field) = fields; fields = field; 1817 field = build_decl (FIELD_DECL, NULL_TREE, unsigned_type_node); 1818 TREE_CHAIN (field) = fields; fields = field; 1819 /* NB: The finish_builtin_struct() routine expects FIELD_DECLs in 1820 reverse order! */ 1821 finish_builtin_struct (type, "__builtin_ObjCString", 1822 fields, NULL_TREE); 1823 1824 return type; 1825} 1826 1827/* Custom build_string which sets TREE_TYPE! */ 1828 1829static tree 1830my_build_string (int len, const char *str) 1831{ 1832 return fix_string_type (build_string (len, str)); 1833} 1834 1835/* Build a string with contents STR and length LEN and convert it to a 1836 pointer. */ 1837 1838static tree 1839my_build_string_pointer (int len, const char *str) 1840{ 1841 tree string = my_build_string (len, str); 1842 tree ptrtype = build_pointer_type (TREE_TYPE (TREE_TYPE (string))); 1843 return build1 (ADDR_EXPR, ptrtype, string); 1844} 1845 1846static hashval_t 1847string_hash (const void *ptr) 1848{ 1849 tree str = ((struct string_descriptor *)ptr)->literal; 1850 const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str); 1851 int i, len = TREE_STRING_LENGTH (str); 1852 hashval_t h = len; 1853 1854 for (i = 0; i < len; i++) 1855 h = ((h * 613) + p[i]); 1856 1857 return h; 1858} 1859 1860static int 1861string_eq (const void *ptr1, const void *ptr2) 1862{ 1863 tree str1 = ((struct string_descriptor *)ptr1)->literal; 1864 tree str2 = ((struct string_descriptor *)ptr2)->literal; 1865 int len1 = TREE_STRING_LENGTH (str1); 1866 1867 return (len1 == TREE_STRING_LENGTH (str2) 1868 && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2), 1869 len1)); 1870} 1871 1872/* Given a chain of STRING_CST's, build a static instance of 1873 NXConstantString which points at the concatenation of those 1874 strings. We place the string object in the __string_objects 1875 section of the __OBJC segment. The Objective-C runtime will 1876 initialize the isa pointers of the string objects to point at the 1877 NXConstantString class object. */ 1878 1879tree 1880objc_build_string_object (tree string) 1881{ 1882 tree initlist, constructor, constant_string_class; 1883 int length; 1884 tree fields, addr; 1885 struct string_descriptor *desc, key; 1886 void **loc; 1887 1888 /* Prep the string argument. */ 1889 string = fix_string_type (string); 1890 TREE_SET_CODE (string, STRING_CST); 1891 length = TREE_STRING_LENGTH (string) - 1; 1892 1893 /* Check whether the string class being used actually exists and has the 1894 correct ivar layout. */ 1895 if (!string_layout_checked) 1896 { 1897 string_layout_checked = -1; 1898 constant_string_class = lookup_interface (constant_string_id); 1899 internal_const_str_type = objc_build_internal_const_str_type (); 1900 1901 if (!constant_string_class 1902 || !(constant_string_type 1903 = CLASS_STATIC_TEMPLATE (constant_string_class))) 1904 error ("cannot find interface declaration for %qs", 1905 IDENTIFIER_POINTER (constant_string_id)); 1906 /* The NSConstantString/NXConstantString ivar layout is now known. */ 1907 else if (!check_string_class_template ()) 1908 error ("interface %qs does not have valid constant string layout", 1909 IDENTIFIER_POINTER (constant_string_id)); 1910 /* For the NeXT runtime, we can generate a literal reference 1911 to the string class, don't need to run a constructor. */ 1912 else if (flag_next_runtime && !setup_string_decl ()) 1913 error ("cannot find reference tag for class %qs", 1914 IDENTIFIER_POINTER (constant_string_id)); 1915 else 1916 { 1917 string_layout_checked = 1; /* Success! */ 1918 add_class_reference (constant_string_id); 1919 } 1920 } 1921 1922 if (string_layout_checked == -1) 1923 return error_mark_node; 1924 1925 /* Perhaps we already constructed a constant string just like this one? */ 1926 key.literal = string; 1927 loc = htab_find_slot (string_htab, &key, INSERT); 1928 desc = *loc; 1929 1930 if (!desc) 1931 { 1932 tree var; 1933 *loc = desc = ggc_alloc (sizeof (*desc)); 1934 desc->literal = string; 1935 1936 /* GNU: (NXConstantString *) & ((__builtin_ObjCString) { NULL, string, length }) */ 1937 /* NeXT: (NSConstantString *) & ((__builtin_ObjCString) { isa, string, length }) */ 1938 fields = TYPE_FIELDS (internal_const_str_type); 1939 initlist 1940 = build_tree_list (fields, 1941 flag_next_runtime 1942 ? build_unary_op (ADDR_EXPR, string_class_decl, 0) 1943 : build_int_cst (NULL_TREE, 0)); 1944 fields = TREE_CHAIN (fields); 1945 initlist = tree_cons (fields, build_unary_op (ADDR_EXPR, string, 1), 1946 initlist); 1947 fields = TREE_CHAIN (fields); 1948 initlist = tree_cons (fields, build_int_cst (NULL_TREE, length), 1949 initlist); 1950 constructor = objc_build_constructor (internal_const_str_type, 1951 nreverse (initlist)); 1952 TREE_INVARIANT (constructor) = true; 1953 1954 if (!flag_next_runtime) 1955 constructor 1956 = objc_add_static_instance (constructor, constant_string_type); 1957 else 1958 { 1959 var = build_decl (CONST_DECL, NULL, TREE_TYPE (constructor)); 1960 DECL_INITIAL (var) = constructor; 1961 TREE_STATIC (var) = 1; 1962 pushdecl_top_level (var); 1963 constructor = var; 1964 } 1965 desc->constructor = constructor; 1966 } 1967 1968 addr = convert (build_pointer_type (constant_string_type), 1969 build_unary_op (ADDR_EXPR, desc->constructor, 1)); 1970 1971 return addr; 1972} 1973 1974/* Declare a static instance of CLASS_DECL initialized by CONSTRUCTOR. */ 1975 1976static GTY(()) int num_static_inst; 1977 1978static tree 1979objc_add_static_instance (tree constructor, tree class_decl) 1980{ 1981 tree *chain, decl; 1982 char buf[256]; 1983 1984 /* Find the list of static instances for the CLASS_DECL. Create one if 1985 not found. */ 1986 for (chain = &objc_static_instances; 1987 *chain && TREE_VALUE (*chain) != class_decl; 1988 chain = &TREE_CHAIN (*chain)); 1989 if (!*chain) 1990 { 1991 *chain = tree_cons (NULL_TREE, class_decl, NULL_TREE); 1992 add_objc_string (OBJC_TYPE_NAME (class_decl), class_names); 1993 } 1994 1995 sprintf (buf, "_OBJC_INSTANCE_%d", num_static_inst++); 1996 decl = build_decl (VAR_DECL, get_identifier (buf), class_decl); 1997 DECL_COMMON (decl) = 1; 1998 TREE_STATIC (decl) = 1; 1999 DECL_ARTIFICIAL (decl) = 1; 2000 TREE_USED (decl) = 1; 2001 DECL_INITIAL (decl) = constructor; 2002 2003 /* We may be writing something else just now. 2004 Postpone till end of input. */ 2005 DECL_DEFER_OUTPUT (decl) = 1; 2006 pushdecl_top_level (decl); 2007 rest_of_decl_compilation (decl, 1, 0); 2008 2009 /* Add the DECL to the head of this CLASS' list. */ 2010 TREE_PURPOSE (*chain) = tree_cons (NULL_TREE, decl, TREE_PURPOSE (*chain)); 2011 2012 return decl; 2013} 2014 2015/* Build a static constant CONSTRUCTOR 2016 with type TYPE and elements ELTS. */ 2017 2018static tree 2019objc_build_constructor (tree type, tree elts) 2020{ 2021 tree constructor = build_constructor_from_list (type, elts); 2022 2023 TREE_CONSTANT (constructor) = 1; 2024 TREE_STATIC (constructor) = 1; 2025 TREE_READONLY (constructor) = 1; 2026 2027#ifdef OBJCPLUS 2028 /* Adjust for impedance mismatch. We should figure out how to build 2029 CONSTRUCTORs that consistently please both the C and C++ gods. */ 2030 if (!TREE_PURPOSE (elts)) 2031 TREE_TYPE (constructor) = NULL_TREE; 2032 TREE_HAS_CONSTRUCTOR (constructor) = 1; 2033#endif 2034 2035 return constructor; 2036} 2037 2038/* Take care of defining and initializing _OBJC_SYMBOLS. */ 2039 2040/* Predefine the following data type: 2041 2042 struct _objc_symtab 2043 { 2044 long sel_ref_cnt; 2045 SEL *refs; 2046 short cls_def_cnt; 2047 short cat_def_cnt; 2048 void *defs[cls_def_cnt + cat_def_cnt]; 2049 }; */ 2050 2051static void 2052build_objc_symtab_template (void) 2053{ 2054 tree field_decl, field_decl_chain; 2055 2056 objc_symtab_template 2057 = start_struct (RECORD_TYPE, get_identifier (UTAG_SYMTAB)); 2058 2059 /* long sel_ref_cnt; */ 2060 field_decl = create_field_decl (long_integer_type_node, "sel_ref_cnt"); 2061 field_decl_chain = field_decl; 2062 2063 /* SEL *refs; */ 2064 field_decl = create_field_decl (build_pointer_type (objc_selector_type), 2065 "refs"); 2066 chainon (field_decl_chain, field_decl); 2067 2068 /* short cls_def_cnt; */ 2069 field_decl = create_field_decl (short_integer_type_node, "cls_def_cnt"); 2070 chainon (field_decl_chain, field_decl); 2071 2072 /* short cat_def_cnt; */ 2073 field_decl = create_field_decl (short_integer_type_node, 2074 "cat_def_cnt"); 2075 chainon (field_decl_chain, field_decl); 2076 2077 if (imp_count || cat_count || !flag_next_runtime) 2078 { 2079 /* void *defs[imp_count + cat_count (+ 1)]; */ 2080 /* NB: The index is one less than the size of the array. */ 2081 int index = imp_count + cat_count 2082 + (flag_next_runtime? -1: 0); 2083 field_decl = create_field_decl 2084 (build_array_type 2085 (ptr_type_node, 2086 build_index_type (build_int_cst (NULL_TREE, index))), 2087 "defs"); 2088 chainon (field_decl_chain, field_decl); 2089 } 2090 2091 finish_struct (objc_symtab_template, field_decl_chain, NULL_TREE); 2092} 2093 2094/* Create the initial value for the `defs' field of _objc_symtab. 2095 This is a CONSTRUCTOR. */ 2096 2097static tree 2098init_def_list (tree type) 2099{ 2100 tree expr, initlist = NULL_TREE; 2101 struct imp_entry *impent; 2102 2103 if (imp_count) 2104 for (impent = imp_list; impent; impent = impent->next) 2105 { 2106 if (TREE_CODE (impent->imp_context) == CLASS_IMPLEMENTATION_TYPE) 2107 { 2108 expr = build_unary_op (ADDR_EXPR, impent->class_decl, 0); 2109 initlist = tree_cons (NULL_TREE, expr, initlist); 2110 } 2111 } 2112 2113 if (cat_count) 2114 for (impent = imp_list; impent; impent = impent->next) 2115 { 2116 if (TREE_CODE (impent->imp_context) == CATEGORY_IMPLEMENTATION_TYPE) 2117 { 2118 expr = build_unary_op (ADDR_EXPR, impent->class_decl, 0); 2119 initlist = tree_cons (NULL_TREE, expr, initlist); 2120 } 2121 } 2122 2123 if (!flag_next_runtime) 2124 { 2125 /* statics = { ..., _OBJC_STATIC_INSTANCES, ... } */ 2126 tree expr; 2127 2128 if (static_instances_decl) 2129 expr = build_unary_op (ADDR_EXPR, static_instances_decl, 0); 2130 else 2131 expr = build_int_cst (NULL_TREE, 0); 2132 2133 initlist = tree_cons (NULL_TREE, expr, initlist); 2134 } 2135 2136 return objc_build_constructor (type, nreverse (initlist)); 2137} 2138 2139/* Construct the initial value for all of _objc_symtab. */ 2140 2141static tree 2142init_objc_symtab (tree type) 2143{ 2144 tree initlist; 2145 2146 /* sel_ref_cnt = { ..., 5, ... } */ 2147 2148 initlist = build_tree_list (NULL_TREE, 2149 build_int_cst (long_integer_type_node, 0)); 2150 2151 /* refs = { ..., _OBJC_SELECTOR_TABLE, ... } */ 2152 2153 if (flag_next_runtime || ! sel_ref_chain) 2154 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 2155 else 2156 initlist 2157 = tree_cons (NULL_TREE, 2158 convert (build_pointer_type (objc_selector_type), 2159 build_unary_op (ADDR_EXPR, 2160 UOBJC_SELECTOR_TABLE_decl, 1)), 2161 initlist); 2162 2163 /* cls_def_cnt = { ..., 5, ... } */ 2164 2165 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, imp_count), initlist); 2166 2167 /* cat_def_cnt = { ..., 5, ... } */ 2168 2169 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, cat_count), initlist); 2170 2171 /* cls_def = { ..., { &Foo, &Bar, ...}, ... } */ 2172 2173 if (imp_count || cat_count || !flag_next_runtime) 2174 { 2175 2176 tree field = TYPE_FIELDS (type); 2177 field = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (field)))); 2178 2179 initlist = tree_cons (NULL_TREE, init_def_list (TREE_TYPE (field)), 2180 initlist); 2181 } 2182 2183 return objc_build_constructor (type, nreverse (initlist)); 2184} 2185 2186/* Generate forward declarations for metadata such as 2187 'OBJC_CLASS_...'. */ 2188 2189static tree 2190build_metadata_decl (const char *name, tree type) 2191{ 2192 tree decl; 2193 2194 /* struct TYPE NAME_<name>; */ 2195 decl = start_var_decl (type, synth_id_with_class_suffix 2196 (name, 2197 objc_implementation_context)); 2198 2199 return decl; 2200} 2201 2202/* Push forward-declarations of all the categories so that 2203 init_def_list can use them in a CONSTRUCTOR. */ 2204 2205static void 2206forward_declare_categories (void) 2207{ 2208 struct imp_entry *impent; 2209 tree sav = objc_implementation_context; 2210 2211 for (impent = imp_list; impent; impent = impent->next) 2212 { 2213 if (TREE_CODE (impent->imp_context) == CATEGORY_IMPLEMENTATION_TYPE) 2214 { 2215 /* Set an invisible arg to synth_id_with_class_suffix. */ 2216 objc_implementation_context = impent->imp_context; 2217 /* extern struct objc_category _OBJC_CATEGORY_<name>; */ 2218 impent->class_decl = build_metadata_decl ("_OBJC_CATEGORY", 2219 objc_category_template); 2220 } 2221 } 2222 objc_implementation_context = sav; 2223} 2224 2225/* Create the declaration of _OBJC_SYMBOLS, with type `struct _objc_symtab' 2226 and initialized appropriately. */ 2227 2228static void 2229generate_objc_symtab_decl (void) 2230{ 2231 /* forward declare categories */ 2232 if (cat_count) 2233 forward_declare_categories (); 2234 2235 build_objc_symtab_template (); 2236 UOBJC_SYMBOLS_decl = start_var_decl (objc_symtab_template, "_OBJC_SYMBOLS"); 2237 finish_var_decl (UOBJC_SYMBOLS_decl, 2238 init_objc_symtab (TREE_TYPE (UOBJC_SYMBOLS_decl))); 2239} 2240 2241static tree 2242init_module_descriptor (tree type) 2243{ 2244 tree initlist, expr; 2245 2246 /* version = { 1, ... } */ 2247 2248 expr = build_int_cst (long_integer_type_node, OBJC_VERSION); 2249 initlist = build_tree_list (NULL_TREE, expr); 2250 2251 /* size = { ..., sizeof (struct _objc_module), ... } */ 2252 2253 expr = convert (long_integer_type_node, 2254 size_in_bytes (objc_module_template)); 2255 initlist = tree_cons (NULL_TREE, expr, initlist); 2256 2257 /* Don't provide any file name for security reasons. */ 2258 /* name = { ..., "", ... } */ 2259 2260 expr = add_objc_string (get_identifier (""), class_names); 2261 initlist = tree_cons (NULL_TREE, expr, initlist); 2262 2263 /* symtab = { ..., _OBJC_SYMBOLS, ... } */ 2264 2265 if (UOBJC_SYMBOLS_decl) 2266 expr = build_unary_op (ADDR_EXPR, UOBJC_SYMBOLS_decl, 0); 2267 else 2268 expr = build_int_cst (NULL_TREE, 0); 2269 initlist = tree_cons (NULL_TREE, expr, initlist); 2270 2271 return objc_build_constructor (type, nreverse (initlist)); 2272} 2273 2274/* Write out the data structures to describe Objective C classes defined. 2275 2276 struct _objc_module { ... } _OBJC_MODULE = { ... }; */ 2277 2278static void 2279build_module_descriptor (void) 2280{ 2281 tree field_decl, field_decl_chain; 2282 2283#ifdef OBJCPLUS 2284 push_lang_context (lang_name_c); /* extern "C" */ 2285#endif 2286 2287 objc_module_template 2288 = start_struct (RECORD_TYPE, get_identifier (UTAG_MODULE)); 2289 2290 /* long version; */ 2291 field_decl = create_field_decl (long_integer_type_node, "version"); 2292 field_decl_chain = field_decl; 2293 2294 /* long size; */ 2295 field_decl = create_field_decl (long_integer_type_node, "size"); 2296 chainon (field_decl_chain, field_decl); 2297 2298 /* char *name; */ 2299 field_decl = create_field_decl (string_type_node, "name"); 2300 chainon (field_decl_chain, field_decl); 2301 2302 /* struct _objc_symtab *symtab; */ 2303 field_decl 2304 = create_field_decl (build_pointer_type 2305 (xref_tag (RECORD_TYPE, 2306 get_identifier (UTAG_SYMTAB))), 2307 "symtab"); 2308 chainon (field_decl_chain, field_decl); 2309 2310 finish_struct (objc_module_template, field_decl_chain, NULL_TREE); 2311 2312 /* Create an instance of "_objc_module". */ 2313 UOBJC_MODULES_decl = start_var_decl (objc_module_template, "_OBJC_MODULES"); 2314 finish_var_decl (UOBJC_MODULES_decl, 2315 init_module_descriptor (TREE_TYPE (UOBJC_MODULES_decl))); 2316 2317#ifdef OBJCPLUS 2318 pop_lang_context (); 2319#endif 2320} 2321 2322/* The GNU runtime requires us to provide a static initializer function 2323 for each module: 2324 2325 static void __objc_gnu_init (void) { 2326 __objc_exec_class (&L_OBJC_MODULES); 2327 } */ 2328 2329static void 2330build_module_initializer_routine (void) 2331{ 2332 tree body; 2333 2334#ifdef OBJCPLUS 2335 push_lang_context (lang_name_c); /* extern "C" */ 2336#endif 2337 2338 objc_push_parm (build_decl (PARM_DECL, NULL_TREE, void_type_node)); 2339 objc_start_function (get_identifier (TAG_GNUINIT), 2340 build_function_type (void_type_node, 2341 OBJC_VOID_AT_END), 2342 NULL_TREE, objc_get_parm_info (0)); 2343 2344 body = c_begin_compound_stmt (true); 2345 add_stmt (build_function_call 2346 (execclass_decl, 2347 build_tree_list 2348 (NULL_TREE, 2349 build_unary_op (ADDR_EXPR, 2350 UOBJC_MODULES_decl, 0)))); 2351 add_stmt (c_end_compound_stmt (body, true)); 2352 2353 TREE_PUBLIC (current_function_decl) = 0; 2354 2355#ifndef OBJCPLUS 2356 /* For Objective-C++, we will need to call __objc_gnu_init 2357 from objc_generate_static_init_call() below. */ 2358 DECL_STATIC_CONSTRUCTOR (current_function_decl) = 1; 2359#endif 2360 2361 GNU_INIT_decl = current_function_decl; 2362 finish_function (); 2363 2364#ifdef OBJCPLUS 2365 pop_lang_context (); 2366#endif 2367} 2368 2369#ifdef OBJCPLUS 2370/* Return 1 if the __objc_gnu_init function has been synthesized and needs 2371 to be called by the module initializer routine. */ 2372 2373int 2374objc_static_init_needed_p (void) 2375{ 2376 return (GNU_INIT_decl != NULL_TREE); 2377} 2378 2379/* Generate a call to the __objc_gnu_init initializer function. */ 2380 2381tree 2382objc_generate_static_init_call (tree ctors ATTRIBUTE_UNUSED) 2383{ 2384 add_stmt (build_stmt (EXPR_STMT, 2385 build_function_call (GNU_INIT_decl, NULL_TREE))); 2386 2387 return ctors; 2388} 2389#endif /* OBJCPLUS */ 2390 2391/* Return the DECL of the string IDENT in the SECTION. */ 2392 2393static tree 2394get_objc_string_decl (tree ident, enum string_section section) 2395{ 2396 tree chain; 2397 2398 if (section == class_names) 2399 chain = class_names_chain; 2400 else if (section == meth_var_names) 2401 chain = meth_var_names_chain; 2402 else if (section == meth_var_types) 2403 chain = meth_var_types_chain; 2404 else 2405 abort (); 2406 2407 for (; chain != 0; chain = TREE_CHAIN (chain)) 2408 if (TREE_VALUE (chain) == ident) 2409 return (TREE_PURPOSE (chain)); 2410 2411 abort (); 2412 return NULL_TREE; 2413} 2414 2415/* Output references to all statically allocated objects. Return the DECL 2416 for the array built. */ 2417 2418static void 2419generate_static_references (void) 2420{ 2421 tree decls = NULL_TREE, expr = NULL_TREE; 2422 tree class_name, class, decl, initlist; 2423 tree cl_chain, in_chain, type 2424 = build_array_type (build_pointer_type (void_type_node), NULL_TREE); 2425 int num_inst, num_class; 2426 char buf[256]; 2427 2428 if (flag_next_runtime) 2429 abort (); 2430 2431 for (cl_chain = objc_static_instances, num_class = 0; 2432 cl_chain; cl_chain = TREE_CHAIN (cl_chain), num_class++) 2433 { 2434 for (num_inst = 0, in_chain = TREE_PURPOSE (cl_chain); 2435 in_chain; num_inst++, in_chain = TREE_CHAIN (in_chain)); 2436 2437 sprintf (buf, "_OBJC_STATIC_INSTANCES_%d", num_class); 2438 decl = start_var_decl (type, buf); 2439 2440 /* Output {class_name, ...}. */ 2441 class = TREE_VALUE (cl_chain); 2442 class_name = get_objc_string_decl (OBJC_TYPE_NAME (class), class_names); 2443 initlist = build_tree_list (NULL_TREE, 2444 build_unary_op (ADDR_EXPR, class_name, 1)); 2445 2446 /* Output {..., instance, ...}. */ 2447 for (in_chain = TREE_PURPOSE (cl_chain); 2448 in_chain; in_chain = TREE_CHAIN (in_chain)) 2449 { 2450 expr = build_unary_op (ADDR_EXPR, TREE_VALUE (in_chain), 1); 2451 initlist = tree_cons (NULL_TREE, expr, initlist); 2452 } 2453 2454 /* Output {..., NULL}. */ 2455 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 2456 2457 expr = objc_build_constructor (TREE_TYPE (decl), nreverse (initlist)); 2458 finish_var_decl (decl, expr); 2459 decls 2460 = tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, decl, 1), decls); 2461 } 2462 2463 decls = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), decls); 2464 expr = objc_build_constructor (type, nreverse (decls)); 2465 static_instances_decl = start_var_decl (type, "_OBJC_STATIC_INSTANCES"); 2466 finish_var_decl (static_instances_decl, expr); 2467} 2468 2469static GTY(()) int selector_reference_idx; 2470 2471static tree 2472build_selector_reference_decl (void) 2473{ 2474 tree decl; 2475 char buf[256]; 2476 2477 sprintf (buf, "_OBJC_SELECTOR_REFERENCES_%d", selector_reference_idx++); 2478 decl = start_var_decl (objc_selector_type, buf); 2479 2480 return decl; 2481} 2482 2483static void 2484build_selector_table_decl (void) 2485{ 2486 tree temp; 2487 2488 if (flag_typed_selectors) 2489 { 2490 build_selector_template (); 2491 temp = build_array_type (objc_selector_template, NULL_TREE); 2492 } 2493 else 2494 temp = build_array_type (objc_selector_type, NULL_TREE); 2495 2496 UOBJC_SELECTOR_TABLE_decl = start_var_decl (temp, "_OBJC_SELECTOR_TABLE"); 2497} 2498 2499/* Just a handy wrapper for add_objc_string. */ 2500 2501static tree 2502build_selector (tree ident) 2503{ 2504 return convert (objc_selector_type, 2505 add_objc_string (ident, meth_var_names)); 2506} 2507 2508static void 2509build_selector_translation_table (void) 2510{ 2511 tree chain, initlist = NULL_TREE; 2512 int offset = 0; 2513 tree decl = NULL_TREE; 2514 2515 for (chain = sel_ref_chain; chain; chain = TREE_CHAIN (chain)) 2516 { 2517 tree expr; 2518 2519 if (warn_selector && objc_implementation_context) 2520 { 2521 tree method_chain; 2522 bool found = false; 2523 for (method_chain = meth_var_names_chain; 2524 method_chain; 2525 method_chain = TREE_CHAIN (method_chain)) 2526 { 2527 if (TREE_VALUE (method_chain) == TREE_VALUE (chain)) 2528 { 2529 found = true; 2530 break; 2531 } 2532 } 2533 if (!found) 2534 { 2535 location_t *loc; 2536 if (flag_next_runtime && TREE_PURPOSE (chain)) 2537 loc = &DECL_SOURCE_LOCATION (TREE_PURPOSE (chain)); 2538 else 2539 loc = &input_location; 2540 warning (0, "%Hcreating selector for nonexistent method %qE", 2541 loc, TREE_VALUE (chain)); 2542 } 2543 } 2544 2545 expr = build_selector (TREE_VALUE (chain)); 2546 /* add one for the '\0' character */ 2547 offset += IDENTIFIER_LENGTH (TREE_VALUE (chain)) + 1; 2548 2549 if (flag_next_runtime) 2550 { 2551 decl = TREE_PURPOSE (chain); 2552 finish_var_decl (decl, expr); 2553 } 2554 else 2555 { 2556 if (flag_typed_selectors) 2557 { 2558 tree eltlist = NULL_TREE; 2559 tree encoding = get_proto_encoding (TREE_PURPOSE (chain)); 2560 eltlist = tree_cons (NULL_TREE, expr, NULL_TREE); 2561 eltlist = tree_cons (NULL_TREE, encoding, eltlist); 2562 expr = objc_build_constructor (objc_selector_template, 2563 nreverse (eltlist)); 2564 } 2565 2566 initlist = tree_cons (NULL_TREE, expr, initlist); 2567 } 2568 } 2569 2570 if (! flag_next_runtime) 2571 { 2572 /* Cause the selector table (previously forward-declared) 2573 to be actually output. */ 2574 initlist = tree_cons (NULL_TREE, 2575 flag_typed_selectors 2576 ? objc_build_constructor 2577 (objc_selector_template, 2578 tree_cons (NULL_TREE, 2579 build_int_cst (NULL_TREE, 0), 2580 tree_cons (NULL_TREE, 2581 build_int_cst (NULL_TREE, 0), 2582 NULL_TREE))) 2583 : build_int_cst (NULL_TREE, 0), initlist); 2584 initlist = objc_build_constructor (TREE_TYPE (UOBJC_SELECTOR_TABLE_decl), 2585 nreverse (initlist)); 2586 finish_var_decl (UOBJC_SELECTOR_TABLE_decl, initlist); 2587 } 2588} 2589 2590static tree 2591get_proto_encoding (tree proto) 2592{ 2593 tree encoding; 2594 if (proto) 2595 { 2596 if (! METHOD_ENCODING (proto)) 2597 { 2598 encoding = encode_method_prototype (proto); 2599 METHOD_ENCODING (proto) = encoding; 2600 } 2601 else 2602 encoding = METHOD_ENCODING (proto); 2603 2604 return add_objc_string (encoding, meth_var_types); 2605 } 2606 else 2607 return build_int_cst (NULL_TREE, 0); 2608} 2609 2610/* sel_ref_chain is a list whose "value" fields will be instances of 2611 identifier_node that represent the selector. */ 2612 2613static tree 2614build_typed_selector_reference (tree ident, tree prototype) 2615{ 2616 tree *chain = &sel_ref_chain; 2617 tree expr; 2618 int index = 0; 2619 2620 while (*chain) 2621 { 2622 if (TREE_PURPOSE (*chain) == prototype && TREE_VALUE (*chain) == ident) 2623 goto return_at_index; 2624 2625 index++; 2626 chain = &TREE_CHAIN (*chain); 2627 } 2628 2629 *chain = tree_cons (prototype, ident, NULL_TREE); 2630 2631 return_at_index: 2632 expr = build_unary_op (ADDR_EXPR, 2633 build_array_ref (UOBJC_SELECTOR_TABLE_decl, 2634 build_int_cst (NULL_TREE, index)), 2635 1); 2636 return convert (objc_selector_type, expr); 2637} 2638 2639static tree 2640build_selector_reference (tree ident) 2641{ 2642 tree *chain = &sel_ref_chain; 2643 tree expr; 2644 int index = 0; 2645 2646 while (*chain) 2647 { 2648 if (TREE_VALUE (*chain) == ident) 2649 return (flag_next_runtime 2650 ? TREE_PURPOSE (*chain) 2651 : build_array_ref (UOBJC_SELECTOR_TABLE_decl, 2652 build_int_cst (NULL_TREE, index))); 2653 2654 index++; 2655 chain = &TREE_CHAIN (*chain); 2656 } 2657 2658 expr = (flag_next_runtime ? build_selector_reference_decl (): NULL_TREE); 2659 2660 *chain = tree_cons (expr, ident, NULL_TREE); 2661 2662 return (flag_next_runtime 2663 ? expr 2664 : build_array_ref (UOBJC_SELECTOR_TABLE_decl, 2665 build_int_cst (NULL_TREE, index))); 2666} 2667 2668static GTY(()) int class_reference_idx; 2669 2670static tree 2671build_class_reference_decl (void) 2672{ 2673 tree decl; 2674 char buf[256]; 2675 2676 sprintf (buf, "_OBJC_CLASS_REFERENCES_%d", class_reference_idx++); 2677 decl = start_var_decl (objc_class_type, buf); 2678 2679 return decl; 2680} 2681 2682/* Create a class reference, but don't create a variable to reference 2683 it. */ 2684 2685static void 2686add_class_reference (tree ident) 2687{ 2688 tree chain; 2689 2690 if ((chain = cls_ref_chain)) 2691 { 2692 tree tail; 2693 do 2694 { 2695 if (ident == TREE_VALUE (chain)) 2696 return; 2697 2698 tail = chain; 2699 chain = TREE_CHAIN (chain); 2700 } 2701 while (chain); 2702 2703 /* Append to the end of the list */ 2704 TREE_CHAIN (tail) = tree_cons (NULL_TREE, ident, NULL_TREE); 2705 } 2706 else 2707 cls_ref_chain = tree_cons (NULL_TREE, ident, NULL_TREE); 2708} 2709 2710/* Get a class reference, creating it if necessary. Also create the 2711 reference variable. */ 2712 2713tree 2714objc_get_class_reference (tree ident) 2715{ 2716 tree orig_ident = (DECL_P (ident) 2717 ? DECL_NAME (ident) 2718 : TYPE_P (ident) 2719 ? OBJC_TYPE_NAME (ident) 2720 : ident); 2721 bool local_scope = false; 2722 2723#ifdef OBJCPLUS 2724 if (processing_template_decl) 2725 /* Must wait until template instantiation time. */ 2726 return build_min_nt (CLASS_REFERENCE_EXPR, ident); 2727#endif 2728 2729 if (TREE_CODE (ident) == TYPE_DECL) 2730 ident = (DECL_ORIGINAL_TYPE (ident) 2731 ? DECL_ORIGINAL_TYPE (ident) 2732 : TREE_TYPE (ident)); 2733 2734#ifdef OBJCPLUS 2735 if (TYPE_P (ident) && TYPE_CONTEXT (ident) 2736 && TYPE_CONTEXT (ident) != global_namespace) 2737 local_scope = true; 2738#endif 2739 2740 if (local_scope || !(ident = objc_is_class_name (ident))) 2741 { 2742 error ("%qs is not an Objective-C class name or alias", 2743 IDENTIFIER_POINTER (orig_ident)); 2744 return error_mark_node; 2745 } 2746 2747 if (flag_next_runtime && !flag_zero_link) 2748 { 2749 tree *chain; 2750 tree decl; 2751 2752 for (chain = &cls_ref_chain; *chain; chain = &TREE_CHAIN (*chain)) 2753 if (TREE_VALUE (*chain) == ident) 2754 { 2755 if (! TREE_PURPOSE (*chain)) 2756 TREE_PURPOSE (*chain) = build_class_reference_decl (); 2757 2758 return TREE_PURPOSE (*chain); 2759 } 2760 2761 decl = build_class_reference_decl (); 2762 *chain = tree_cons (decl, ident, NULL_TREE); 2763 return decl; 2764 } 2765 else 2766 { 2767 tree params; 2768 2769 add_class_reference (ident); 2770 2771 params = build_tree_list (NULL_TREE, 2772 my_build_string_pointer 2773 (IDENTIFIER_LENGTH (ident) + 1, 2774 IDENTIFIER_POINTER (ident))); 2775 2776 assemble_external (objc_get_class_decl); 2777 return build_function_call (objc_get_class_decl, params); 2778 } 2779} 2780 2781/* For each string section we have a chain which maps identifier nodes 2782 to decls for the strings. */ 2783 2784static tree 2785add_objc_string (tree ident, enum string_section section) 2786{ 2787 tree *chain, decl, type, string_expr; 2788 2789 if (section == class_names) 2790 chain = &class_names_chain; 2791 else if (section == meth_var_names) 2792 chain = &meth_var_names_chain; 2793 else if (section == meth_var_types) 2794 chain = &meth_var_types_chain; 2795 else 2796 abort (); 2797 2798 while (*chain) 2799 { 2800 if (TREE_VALUE (*chain) == ident) 2801 return convert (string_type_node, 2802 build_unary_op (ADDR_EXPR, TREE_PURPOSE (*chain), 1)); 2803 2804 chain = &TREE_CHAIN (*chain); 2805 } 2806 2807 decl = build_objc_string_decl (section); 2808 2809 type = build_array_type 2810 (char_type_node, 2811 build_index_type 2812 (build_int_cst (NULL_TREE, 2813 IDENTIFIER_LENGTH (ident)))); 2814 decl = start_var_decl (type, IDENTIFIER_POINTER (DECL_NAME (decl))); 2815 string_expr = my_build_string (IDENTIFIER_LENGTH (ident) + 1, 2816 IDENTIFIER_POINTER (ident)); 2817 finish_var_decl (decl, string_expr); 2818 2819 *chain = tree_cons (decl, ident, NULL_TREE); 2820 2821 return convert (string_type_node, build_unary_op (ADDR_EXPR, decl, 1)); 2822} 2823 2824static GTY(()) int class_names_idx; 2825static GTY(()) int meth_var_names_idx; 2826static GTY(()) int meth_var_types_idx; 2827 2828static tree 2829build_objc_string_decl (enum string_section section) 2830{ 2831 tree decl, ident; 2832 char buf[256]; 2833 2834 if (section == class_names) 2835 sprintf (buf, "_OBJC_CLASS_NAME_%d", class_names_idx++); 2836 else if (section == meth_var_names) 2837 sprintf (buf, "_OBJC_METH_VAR_NAME_%d", meth_var_names_idx++); 2838 else if (section == meth_var_types) 2839 sprintf (buf, "_OBJC_METH_VAR_TYPE_%d", meth_var_types_idx++); 2840 2841 ident = get_identifier (buf); 2842 2843 decl = build_decl (VAR_DECL, ident, build_array_type (char_type_node, 0)); 2844 DECL_EXTERNAL (decl) = 1; 2845 TREE_PUBLIC (decl) = 0; 2846 TREE_USED (decl) = 1; 2847 TREE_CONSTANT (decl) = 1; 2848 DECL_CONTEXT (decl) = 0; 2849 DECL_ARTIFICIAL (decl) = 1; 2850#ifdef OBJCPLUS 2851 DECL_THIS_STATIC (decl) = 1; /* squash redeclaration errors */ 2852#endif 2853 2854 make_decl_rtl (decl); 2855 pushdecl_top_level (decl); 2856 2857 return decl; 2858} 2859 2860 2861void 2862objc_declare_alias (tree alias_ident, tree class_ident) 2863{ 2864 tree underlying_class; 2865 2866#ifdef OBJCPLUS 2867 if (current_namespace != global_namespace) { 2868 error ("Objective-C declarations may only appear in global scope"); 2869 } 2870#endif /* OBJCPLUS */ 2871 2872 if (!(underlying_class = objc_is_class_name (class_ident))) 2873 warning (0, "cannot find class %qs", IDENTIFIER_POINTER (class_ident)); 2874 else if (objc_is_class_name (alias_ident)) 2875 warning (0, "class %qs already exists", IDENTIFIER_POINTER (alias_ident)); 2876 else 2877 { 2878 /* Implement @compatibility_alias as a typedef. */ 2879#ifdef OBJCPLUS 2880 push_lang_context (lang_name_c); /* extern "C" */ 2881#endif 2882 lang_hooks.decls.pushdecl (build_decl 2883 (TYPE_DECL, 2884 alias_ident, 2885 xref_tag (RECORD_TYPE, underlying_class))); 2886#ifdef OBJCPLUS 2887 pop_lang_context (); 2888#endif 2889 alias_chain = tree_cons (underlying_class, alias_ident, alias_chain); 2890 } 2891} 2892 2893void 2894objc_declare_class (tree ident_list) 2895{ 2896 tree list; 2897#ifdef OBJCPLUS 2898 if (current_namespace != global_namespace) { 2899 error ("Objective-C declarations may only appear in global scope"); 2900 } 2901#endif /* OBJCPLUS */ 2902 2903 for (list = ident_list; list; list = TREE_CHAIN (list)) 2904 { 2905 tree ident = TREE_VALUE (list); 2906 2907 if (! objc_is_class_name (ident)) 2908 { 2909 tree record = lookup_name (ident), type = record; 2910 2911 if (record) 2912 { 2913 if (TREE_CODE (record) == TYPE_DECL) 2914 type = DECL_ORIGINAL_TYPE (record); 2915 2916 if (!TYPE_HAS_OBJC_INFO (type) 2917 || !TYPE_OBJC_INTERFACE (type)) 2918 { 2919 error ("%qs redeclared as different kind of symbol", 2920 IDENTIFIER_POINTER (ident)); 2921 error ("previous declaration of %q+D", 2922 record); 2923 } 2924 } 2925 2926 record = xref_tag (RECORD_TYPE, ident); 2927 INIT_TYPE_OBJC_INFO (record); 2928 TYPE_OBJC_INTERFACE (record) = ident; 2929 class_chain = tree_cons (NULL_TREE, ident, class_chain); 2930 } 2931 } 2932} 2933 2934tree 2935objc_is_class_name (tree ident) 2936{ 2937 tree chain; 2938 2939 if (ident && TREE_CODE (ident) == IDENTIFIER_NODE 2940 && identifier_global_value (ident)) 2941 ident = identifier_global_value (ident); 2942 while (ident && TREE_CODE (ident) == TYPE_DECL && DECL_ORIGINAL_TYPE (ident)) 2943 ident = OBJC_TYPE_NAME (DECL_ORIGINAL_TYPE (ident)); 2944 2945 if (ident && TREE_CODE (ident) == RECORD_TYPE) 2946 ident = OBJC_TYPE_NAME (ident); 2947#ifdef OBJCPLUS 2948 if (ident && TREE_CODE (ident) == TYPE_DECL) 2949 ident = DECL_NAME (ident); 2950#endif 2951 if (!ident || TREE_CODE (ident) != IDENTIFIER_NODE) 2952 return NULL_TREE; 2953 2954 if (lookup_interface (ident)) 2955 return ident; 2956 2957 for (chain = class_chain; chain; chain = TREE_CHAIN (chain)) 2958 { 2959 if (ident == TREE_VALUE (chain)) 2960 return ident; 2961 } 2962 2963 for (chain = alias_chain; chain; chain = TREE_CHAIN (chain)) 2964 { 2965 if (ident == TREE_VALUE (chain)) 2966 return TREE_PURPOSE (chain); 2967 } 2968 2969 return 0; 2970} 2971 2972/* Check whether TYPE is either 'id' or 'Class'. */ 2973 2974tree 2975objc_is_id (tree type) 2976{ 2977 if (type && TREE_CODE (type) == IDENTIFIER_NODE 2978 && identifier_global_value (type)) 2979 type = identifier_global_value (type); 2980 2981 if (type && TREE_CODE (type) == TYPE_DECL) 2982 type = TREE_TYPE (type); 2983 2984 /* NB: This function may be called before the ObjC front-end has 2985 been initialized, in which case OBJC_OBJECT_TYPE will (still) be NULL. */ 2986 return (objc_object_type && type 2987 && (IS_ID (type) || IS_CLASS (type) || IS_SUPER (type)) 2988 ? type 2989 : NULL_TREE); 2990} 2991 2992/* Check whether TYPE is either 'id', 'Class', or a pointer to an ObjC 2993 class instance. This is needed by other parts of the compiler to 2994 handle ObjC types gracefully. */ 2995 2996tree 2997objc_is_object_ptr (tree type) 2998{ 2999 tree ret; 3000 3001 type = TYPE_MAIN_VARIANT (type); 3002 if (!POINTER_TYPE_P (type)) 3003 return 0; 3004 3005 ret = objc_is_id (type); 3006 if (!ret) 3007 ret = objc_is_class_name (TREE_TYPE (type)); 3008 3009 return ret; 3010} 3011 3012static int 3013objc_is_gcable_type (tree type, int or_strong_p) 3014{ 3015 tree name; 3016 3017 if (!TYPE_P (type)) 3018 return 0; 3019 if (objc_is_id (TYPE_MAIN_VARIANT (type))) 3020 return 1; 3021 if (or_strong_p && lookup_attribute ("objc_gc", TYPE_ATTRIBUTES (type))) 3022 return 1; 3023 if (TREE_CODE (type) != POINTER_TYPE && TREE_CODE (type) != INDIRECT_REF) 3024 return 0; 3025 type = TREE_TYPE (type); 3026 if (TREE_CODE (type) != RECORD_TYPE) 3027 return 0; 3028 name = TYPE_NAME (type); 3029 return (objc_is_class_name (name) != NULL_TREE); 3030} 3031 3032static tree 3033objc_substitute_decl (tree expr, tree oldexpr, tree newexpr) 3034{ 3035 if (expr == oldexpr) 3036 return newexpr; 3037 3038 switch (TREE_CODE (expr)) 3039 { 3040 case COMPONENT_REF: 3041 return objc_build_component_ref 3042 (objc_substitute_decl (TREE_OPERAND (expr, 0), 3043 oldexpr, 3044 newexpr), 3045 DECL_NAME (TREE_OPERAND (expr, 1))); 3046 case ARRAY_REF: 3047 return build_array_ref (objc_substitute_decl (TREE_OPERAND (expr, 0), 3048 oldexpr, 3049 newexpr), 3050 TREE_OPERAND (expr, 1)); 3051 case INDIRECT_REF: 3052 return build_indirect_ref (objc_substitute_decl (TREE_OPERAND (expr, 0), 3053 oldexpr, 3054 newexpr), "->"); 3055 default: 3056 return expr; 3057 } 3058} 3059 3060static tree 3061objc_build_ivar_assignment (tree outervar, tree lhs, tree rhs) 3062{ 3063 tree func_params; 3064 /* The LHS parameter contains the expression 'outervar->memberspec'; 3065 we need to transform it into '&((typeof(outervar) *) 0)->memberspec', 3066 where memberspec may be arbitrarily complex (e.g., 'g->f.d[2].g[3]'). 3067 */ 3068 tree offs 3069 = objc_substitute_decl 3070 (lhs, outervar, convert (TREE_TYPE (outervar), integer_zero_node)); 3071 tree func 3072 = (flag_objc_direct_dispatch 3073 ? objc_assign_ivar_fast_decl 3074 : objc_assign_ivar_decl); 3075 3076 offs = convert (integer_type_node, build_unary_op (ADDR_EXPR, offs, 0)); 3077 offs = fold (offs); 3078 func_params = tree_cons (NULL_TREE, 3079 convert (objc_object_type, rhs), 3080 tree_cons (NULL_TREE, convert (objc_object_type, outervar), 3081 tree_cons (NULL_TREE, offs, 3082 NULL_TREE))); 3083 3084 assemble_external (func); 3085 return build_function_call (func, func_params); 3086} 3087 3088static tree 3089objc_build_global_assignment (tree lhs, tree rhs) 3090{ 3091 tree func_params = tree_cons (NULL_TREE, 3092 convert (objc_object_type, rhs), 3093 tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type), 3094 build_unary_op (ADDR_EXPR, lhs, 0)), 3095 NULL_TREE)); 3096 3097 assemble_external (objc_assign_global_decl); 3098 return build_function_call (objc_assign_global_decl, func_params); 3099} 3100 3101static tree 3102objc_build_strong_cast_assignment (tree lhs, tree rhs) 3103{ 3104 tree func_params = tree_cons (NULL_TREE, 3105 convert (objc_object_type, rhs), 3106 tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type), 3107 build_unary_op (ADDR_EXPR, lhs, 0)), 3108 NULL_TREE)); 3109 3110 assemble_external (objc_assign_strong_cast_decl); 3111 return build_function_call (objc_assign_strong_cast_decl, func_params); 3112} 3113 3114static int 3115objc_is_gcable_p (tree expr) 3116{ 3117 return (TREE_CODE (expr) == COMPONENT_REF 3118 ? objc_is_gcable_p (TREE_OPERAND (expr, 1)) 3119 : TREE_CODE (expr) == ARRAY_REF 3120 ? (objc_is_gcable_p (TREE_TYPE (expr)) 3121 || objc_is_gcable_p (TREE_OPERAND (expr, 0))) 3122 : TREE_CODE (expr) == ARRAY_TYPE 3123 ? objc_is_gcable_p (TREE_TYPE (expr)) 3124 : TYPE_P (expr) 3125 ? objc_is_gcable_type (expr, 1) 3126 : (objc_is_gcable_p (TREE_TYPE (expr)) 3127 || (DECL_P (expr) 3128 && lookup_attribute ("objc_gc", DECL_ATTRIBUTES (expr))))); 3129} 3130 3131static int 3132objc_is_ivar_reference_p (tree expr) 3133{ 3134 return (TREE_CODE (expr) == ARRAY_REF 3135 ? objc_is_ivar_reference_p (TREE_OPERAND (expr, 0)) 3136 : TREE_CODE (expr) == COMPONENT_REF 3137 ? TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL 3138 : 0); 3139} 3140 3141static int 3142objc_is_global_reference_p (tree expr) 3143{ 3144 return (TREE_CODE (expr) == INDIRECT_REF || TREE_CODE (expr) == PLUS_EXPR 3145 ? objc_is_global_reference_p (TREE_OPERAND (expr, 0)) 3146 : DECL_P (expr) 3147 ? (!DECL_CONTEXT (expr) || TREE_STATIC (expr)) 3148 : 0); 3149} 3150 3151tree 3152objc_generate_write_barrier (tree lhs, enum tree_code modifycode, tree rhs) 3153{ 3154 tree result = NULL_TREE, outer; 3155 int strong_cast_p = 0, outer_gc_p = 0, indirect_p = 0; 3156 3157 /* See if we have any lhs casts, and strip them out. NB: The lvalue casts 3158 will have been transformed to the form '*(type *)&expr'. */ 3159 if (TREE_CODE (lhs) == INDIRECT_REF) 3160 { 3161 outer = TREE_OPERAND (lhs, 0); 3162 3163 while (!strong_cast_p 3164 && (TREE_CODE (outer) == CONVERT_EXPR 3165 || TREE_CODE (outer) == NOP_EXPR 3166 || TREE_CODE (outer) == NON_LVALUE_EXPR)) 3167 { 3168 tree lhstype = TREE_TYPE (outer); 3169 3170 /* Descend down the cast chain, and record the first objc_gc 3171 attribute found. */ 3172 if (POINTER_TYPE_P (lhstype)) 3173 { 3174 tree attr 3175 = lookup_attribute ("objc_gc", 3176 TYPE_ATTRIBUTES (TREE_TYPE (lhstype))); 3177 3178 if (attr) 3179 strong_cast_p = 1; 3180 } 3181 3182 outer = TREE_OPERAND (outer, 0); 3183 } 3184 } 3185 3186 /* If we have a __strong cast, it trumps all else. */ 3187 if (strong_cast_p) 3188 { 3189 if (modifycode != NOP_EXPR) 3190 goto invalid_pointer_arithmetic; 3191 3192 if (warn_assign_intercept) 3193 warning (0, "strong-cast assignment has been intercepted"); 3194 3195 result = objc_build_strong_cast_assignment (lhs, rhs); 3196 3197 goto exit_point; 3198 } 3199 3200 /* the lhs must be of a suitable type, regardless of its underlying 3201 structure. */ 3202 if (!objc_is_gcable_p (lhs)) 3203 goto exit_point; 3204 3205 outer = lhs; 3206 3207 while (outer 3208 && (TREE_CODE (outer) == COMPONENT_REF 3209 || TREE_CODE (outer) == ARRAY_REF)) 3210 outer = TREE_OPERAND (outer, 0); 3211 3212 if (TREE_CODE (outer) == INDIRECT_REF) 3213 { 3214 outer = TREE_OPERAND (outer, 0); 3215 indirect_p = 1; 3216 } 3217 3218 outer_gc_p = objc_is_gcable_p (outer); 3219 3220 /* Handle ivar assignments. */ 3221 if (objc_is_ivar_reference_p (lhs)) 3222 { 3223 /* if the struct to the left of the ivar is not an Objective-C object (__strong 3224 doesn't cut it here), the best we can do here is suggest a cast. */ 3225 if (!objc_is_gcable_type (TREE_TYPE (outer), 0)) 3226 { 3227 /* We may still be able to use the global write barrier... */ 3228 if (!indirect_p && objc_is_global_reference_p (outer)) 3229 goto global_reference; 3230 3231 suggest_cast: 3232 if (modifycode == NOP_EXPR) 3233 { 3234 if (warn_assign_intercept) 3235 warning (0, "strong-cast may possibly be needed"); 3236 } 3237 3238 goto exit_point; 3239 } 3240 3241 if (modifycode != NOP_EXPR) 3242 goto invalid_pointer_arithmetic; 3243 3244 if (warn_assign_intercept) 3245 warning (0, "instance variable assignment has been intercepted"); 3246 3247 result = objc_build_ivar_assignment (outer, lhs, rhs); 3248 3249 goto exit_point; 3250 } 3251 3252 /* Likewise, intercept assignment to global/static variables if their type is 3253 GC-marked. */ 3254 if (objc_is_global_reference_p (outer)) 3255 { 3256 if (indirect_p) 3257 goto suggest_cast; 3258 3259 global_reference: 3260 if (modifycode != NOP_EXPR) 3261 { 3262 invalid_pointer_arithmetic: 3263 if (outer_gc_p) 3264 warning (0, "pointer arithmetic for garbage-collected objects not allowed"); 3265 3266 goto exit_point; 3267 } 3268 3269 if (warn_assign_intercept) 3270 warning (0, "global/static variable assignment has been intercepted"); 3271 3272 result = objc_build_global_assignment (lhs, rhs); 3273 } 3274 3275 /* In all other cases, fall back to the normal mechanism. */ 3276 exit_point: 3277 return result; 3278} 3279 3280struct interface_tuple GTY(()) 3281{ 3282 tree id; 3283 tree class_name; 3284}; 3285 3286static GTY ((param_is (struct interface_tuple))) htab_t interface_htab; 3287 3288static hashval_t 3289hash_interface (const void *p) 3290{ 3291 const struct interface_tuple *d = p; 3292 return IDENTIFIER_HASH_VALUE (d->id); 3293} 3294 3295static int 3296eq_interface (const void *p1, const void *p2) 3297{ 3298 const struct interface_tuple *d = p1; 3299 return d->id == p2; 3300} 3301 3302static tree 3303lookup_interface (tree ident) 3304{ 3305#ifdef OBJCPLUS 3306 if (ident && TREE_CODE (ident) == TYPE_DECL) 3307 ident = DECL_NAME (ident); 3308#endif 3309 3310 if (ident == NULL_TREE || TREE_CODE (ident) != IDENTIFIER_NODE) 3311 return NULL_TREE; 3312 3313 { 3314 struct interface_tuple **slot; 3315 tree i = NULL_TREE; 3316 3317 if (interface_htab) 3318 { 3319 slot = (struct interface_tuple **) 3320 htab_find_slot_with_hash (interface_htab, ident, 3321 IDENTIFIER_HASH_VALUE (ident), 3322 NO_INSERT); 3323 if (slot && *slot) 3324 i = (*slot)->class_name; 3325 } 3326 return i; 3327 } 3328} 3329 3330/* Implement @defs (<classname>) within struct bodies. */ 3331 3332tree 3333objc_get_class_ivars (tree class_name) 3334{ 3335 tree interface = lookup_interface (class_name); 3336 3337 if (interface) 3338 return get_class_ivars (interface, true); 3339 3340 error ("cannot find interface declaration for %qs", 3341 IDENTIFIER_POINTER (class_name)); 3342 3343 return error_mark_node; 3344} 3345 3346/* Used by: build_private_template, continue_class, 3347 and for @defs constructs. */ 3348 3349static tree 3350get_class_ivars (tree interface, bool inherited) 3351{ 3352 tree ivar_chain = copy_list (CLASS_RAW_IVARS (interface)); 3353 3354 /* Both CLASS_RAW_IVARS and CLASS_IVARS contain a list of ivars declared 3355 by the current class (i.e., they do not include super-class ivars). 3356 However, the CLASS_IVARS list will be side-effected by a call to 3357 finish_struct(), which will fill in field offsets. */ 3358 if (!CLASS_IVARS (interface)) 3359 CLASS_IVARS (interface) = ivar_chain; 3360 3361 if (!inherited) 3362 return ivar_chain; 3363 3364 while (CLASS_SUPER_NAME (interface)) 3365 { 3366 /* Prepend super-class ivars. */ 3367 interface = lookup_interface (CLASS_SUPER_NAME (interface)); 3368 ivar_chain = chainon (copy_list (CLASS_RAW_IVARS (interface)), 3369 ivar_chain); 3370 } 3371 3372 return ivar_chain; 3373} 3374 3375static tree 3376objc_create_temporary_var (tree type) 3377{ 3378 tree decl; 3379 3380 decl = build_decl (VAR_DECL, NULL_TREE, type); 3381 TREE_USED (decl) = 1; 3382 DECL_ARTIFICIAL (decl) = 1; 3383 DECL_IGNORED_P (decl) = 1; 3384 DECL_CONTEXT (decl) = current_function_decl; 3385 3386 return decl; 3387} 3388 3389/* Exception handling constructs. We begin by having the parser do most 3390 of the work and passing us blocks. What we do next depends on whether 3391 we're doing "native" exception handling or legacy Darwin setjmp exceptions. 3392 We abstract all of this in a handful of appropriately named routines. */ 3393 3394/* Stack of open try blocks. */ 3395 3396struct objc_try_context 3397{ 3398 struct objc_try_context *outer; 3399 3400 /* Statements (or statement lists) as processed by the parser. */ 3401 tree try_body; 3402 tree finally_body; 3403 3404 /* Some file position locations. */ 3405 location_t try_locus; 3406 location_t end_try_locus; 3407 location_t end_catch_locus; 3408 location_t finally_locus; 3409 location_t end_finally_locus; 3410 3411 /* A STATEMENT_LIST of CATCH_EXPRs, appropriate for sticking into op1 3412 of a TRY_CATCH_EXPR. Even when doing Darwin setjmp. */ 3413 tree catch_list; 3414 3415 /* The CATCH_EXPR of an open @catch clause. */ 3416 tree current_catch; 3417 3418 /* The VAR_DECL holding the Darwin equivalent of EXC_PTR_EXPR. */ 3419 tree caught_decl; 3420 tree stack_decl; 3421 tree rethrow_decl; 3422}; 3423 3424static struct objc_try_context *cur_try_context; 3425 3426/* This hook, called via lang_eh_runtime_type, generates a runtime object 3427 that represents TYPE. For Objective-C, this is just the class name. */ 3428/* ??? Isn't there a class object or some such? Is it easy to get? */ 3429 3430#ifndef OBJCPLUS 3431static tree 3432objc_eh_runtime_type (tree type) 3433{ 3434 return add_objc_string (OBJC_TYPE_NAME (TREE_TYPE (type)), class_names); 3435} 3436#endif 3437 3438/* Initialize exception handling. */ 3439 3440static void 3441objc_init_exceptions (void) 3442{ 3443 static bool done = false; 3444 if (done) 3445 return; 3446 done = true; 3447 3448 if (flag_objc_sjlj_exceptions) 3449 { 3450 /* On Darwin, ObjC exceptions require a sufficiently recent 3451 version of the runtime, so the user must ask for them explicitly. */ 3452 if (!flag_objc_exceptions) 3453 warning (0, "use %<-fobjc-exceptions%> to enable Objective-C " 3454 "exception syntax"); 3455 } 3456#ifndef OBJCPLUS 3457 else 3458 { 3459 c_eh_initialized_p = true; 3460 eh_personality_libfunc 3461 = init_one_libfunc (USING_SJLJ_EXCEPTIONS 3462 ? "__gnu_objc_personality_sj0" 3463 : "__gnu_objc_personality_v0"); 3464 default_init_unwind_resume_libfunc (); 3465 using_eh_for_cleanups (); 3466 lang_eh_runtime_type = objc_eh_runtime_type; 3467 } 3468#endif 3469} 3470 3471/* Build an EXC_PTR_EXPR, or the moral equivalent. In the case of Darwin, 3472 we'll arrange for it to be initialized (and associated with a binding) 3473 later. */ 3474 3475static tree 3476objc_build_exc_ptr (void) 3477{ 3478 if (flag_objc_sjlj_exceptions) 3479 { 3480 tree var = cur_try_context->caught_decl; 3481 if (!var) 3482 { 3483 var = objc_create_temporary_var (objc_object_type); 3484 cur_try_context->caught_decl = var; 3485 } 3486 return var; 3487 } 3488 else 3489 return build0 (EXC_PTR_EXPR, objc_object_type); 3490} 3491 3492/* Build "objc_exception_try_exit(&_stack)". */ 3493 3494static tree 3495next_sjlj_build_try_exit (void) 3496{ 3497 tree t; 3498 t = build_fold_addr_expr (cur_try_context->stack_decl); 3499 t = tree_cons (NULL, t, NULL); 3500 t = build_function_call (objc_exception_try_exit_decl, t); 3501 return t; 3502} 3503 3504/* Build 3505 objc_exception_try_enter (&_stack); 3506 if (_setjmp(&_stack.buf)) 3507 ; 3508 else 3509 ; 3510 Return the COND_EXPR. Note that the THEN and ELSE fields are left 3511 empty, ready for the caller to fill them in. */ 3512 3513static tree 3514next_sjlj_build_enter_and_setjmp (void) 3515{ 3516 tree t, enter, sj, cond; 3517 3518 t = build_fold_addr_expr (cur_try_context->stack_decl); 3519 t = tree_cons (NULL, t, NULL); 3520 enter = build_function_call (objc_exception_try_enter_decl, t); 3521 3522 t = objc_build_component_ref (cur_try_context->stack_decl, 3523 get_identifier ("buf")); 3524 t = build_fold_addr_expr (t); 3525#ifdef OBJCPLUS 3526 /* Convert _setjmp argument to type that is expected. */ 3527 if (TYPE_ARG_TYPES (TREE_TYPE (objc_setjmp_decl))) 3528 t = convert (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (objc_setjmp_decl))), t); 3529 else 3530 t = convert (ptr_type_node, t); 3531#else 3532 t = convert (ptr_type_node, t); 3533#endif 3534 t = tree_cons (NULL, t, NULL); 3535 sj = build_function_call (objc_setjmp_decl, t); 3536 3537 cond = build2 (COMPOUND_EXPR, TREE_TYPE (sj), enter, sj); 3538 cond = c_common_truthvalue_conversion (cond); 3539 3540 return build3 (COND_EXPR, void_type_node, cond, NULL, NULL); 3541} 3542 3543/* Build: 3544 3545 DECL = objc_exception_extract(&_stack); */ 3546 3547static tree 3548next_sjlj_build_exc_extract (tree decl) 3549{ 3550 tree t; 3551 3552 t = build_fold_addr_expr (cur_try_context->stack_decl); 3553 t = tree_cons (NULL, t, NULL); 3554 t = build_function_call (objc_exception_extract_decl, t); 3555 t = convert (TREE_TYPE (decl), t); 3556 t = build2 (MODIFY_EXPR, void_type_node, decl, t); 3557 3558 return t; 3559} 3560 3561/* Build 3562 if (objc_exception_match(obj_get_class(TYPE), _caught) 3563 BODY 3564 else if (...) 3565 ... 3566 else 3567 { 3568 _rethrow = _caught; 3569 objc_exception_try_exit(&_stack); 3570 } 3571 from the sequence of CATCH_EXPRs in the current try context. */ 3572 3573static tree 3574next_sjlj_build_catch_list (void) 3575{ 3576 tree_stmt_iterator i = tsi_start (cur_try_context->catch_list); 3577 tree catch_seq, t; 3578 tree *last = &catch_seq; 3579 bool saw_id = false; 3580 3581 for (; !tsi_end_p (i); tsi_next (&i)) 3582 { 3583 tree stmt = tsi_stmt (i); 3584 tree type = CATCH_TYPES (stmt); 3585 tree body = CATCH_BODY (stmt); 3586 3587 if (type == NULL) 3588 { 3589 *last = body; 3590 saw_id = true; 3591 break; 3592 } 3593 else 3594 { 3595 tree args, cond; 3596 3597 if (type == error_mark_node) 3598 cond = error_mark_node; 3599 else 3600 { 3601 args = tree_cons (NULL, cur_try_context->caught_decl, NULL); 3602 t = objc_get_class_reference (OBJC_TYPE_NAME (TREE_TYPE (type))); 3603 args = tree_cons (NULL, t, args); 3604 t = build_function_call (objc_exception_match_decl, args); 3605 cond = c_common_truthvalue_conversion (t); 3606 } 3607 t = build3 (COND_EXPR, void_type_node, cond, body, NULL); 3608 SET_EXPR_LOCUS (t, EXPR_LOCUS (stmt)); 3609 3610 *last = t; 3611 last = &COND_EXPR_ELSE (t); 3612 } 3613 } 3614 3615 if (!saw_id) 3616 { 3617 t = build2 (MODIFY_EXPR, void_type_node, cur_try_context->rethrow_decl, 3618 cur_try_context->caught_decl); 3619 SET_EXPR_LOCATION (t, cur_try_context->end_catch_locus); 3620 append_to_statement_list (t, last); 3621 3622 t = next_sjlj_build_try_exit (); 3623 SET_EXPR_LOCATION (t, cur_try_context->end_catch_locus); 3624 append_to_statement_list (t, last); 3625 } 3626 3627 return catch_seq; 3628} 3629 3630/* Build a complete @try-@catch-@finally block for legacy Darwin setjmp 3631 exception handling. We aim to build: 3632 3633 { 3634 struct _objc_exception_data _stack; 3635 id _rethrow = 0; 3636 try 3637 { 3638 objc_exception_try_enter (&_stack); 3639 if (_setjmp(&_stack.buf)) 3640 { 3641 id _caught = objc_exception_extract(&_stack); 3642 objc_exception_try_enter (&_stack); 3643 if (_setjmp(&_stack.buf)) 3644 _rethrow = objc_exception_extract(&_stack); 3645 else 3646 CATCH-LIST 3647 } 3648 else 3649 TRY-BLOCK 3650 } 3651 finally 3652 { 3653 if (!_rethrow) 3654 objc_exception_try_exit(&_stack); 3655 FINALLY-BLOCK 3656 if (_rethrow) 3657 objc_exception_throw(_rethrow); 3658 } 3659 } 3660 3661 If CATCH-LIST is empty, we can omit all of the block containing 3662 "_caught" except for the setting of _rethrow. Note the use of 3663 a real TRY_FINALLY_EXPR here, which is not involved in EH per-se, 3664 but handles goto and other exits from the block. */ 3665 3666static tree 3667next_sjlj_build_try_catch_finally (void) 3668{ 3669 tree rethrow_decl, stack_decl, t; 3670 tree catch_seq, try_fin, bind; 3671 3672 /* Create the declarations involved. */ 3673 t = xref_tag (RECORD_TYPE, get_identifier (UTAG_EXCDATA)); 3674 stack_decl = objc_create_temporary_var (t); 3675 cur_try_context->stack_decl = stack_decl; 3676 3677 rethrow_decl = objc_create_temporary_var (objc_object_type); 3678 cur_try_context->rethrow_decl = rethrow_decl; 3679 TREE_CHAIN (rethrow_decl) = stack_decl; 3680 3681 /* Build the outermost variable binding level. */ 3682 bind = build3 (BIND_EXPR, void_type_node, rethrow_decl, NULL, NULL); 3683 SET_EXPR_LOCATION (bind, cur_try_context->try_locus); 3684 TREE_SIDE_EFFECTS (bind) = 1; 3685 3686 /* Initialize rethrow_decl. */ 3687 t = build2 (MODIFY_EXPR, void_type_node, rethrow_decl, 3688 convert (objc_object_type, null_pointer_node)); 3689 SET_EXPR_LOCATION (t, cur_try_context->try_locus); 3690 append_to_statement_list (t, &BIND_EXPR_BODY (bind)); 3691 3692 /* Build the outermost TRY_FINALLY_EXPR. */ 3693 try_fin = build2 (TRY_FINALLY_EXPR, void_type_node, NULL, NULL); 3694 SET_EXPR_LOCATION (try_fin, cur_try_context->try_locus); 3695 TREE_SIDE_EFFECTS (try_fin) = 1; 3696 append_to_statement_list (try_fin, &BIND_EXPR_BODY (bind)); 3697 3698 /* Create the complete catch sequence. */ 3699 if (cur_try_context->catch_list) 3700 { 3701 tree caught_decl = objc_build_exc_ptr (); 3702 catch_seq = build_stmt (BIND_EXPR, caught_decl, NULL, NULL); 3703 TREE_SIDE_EFFECTS (catch_seq) = 1; 3704 3705 t = next_sjlj_build_exc_extract (caught_decl); 3706 append_to_statement_list (t, &BIND_EXPR_BODY (catch_seq)); 3707 3708 t = next_sjlj_build_enter_and_setjmp (); 3709 COND_EXPR_THEN (t) = next_sjlj_build_exc_extract (rethrow_decl); 3710 COND_EXPR_ELSE (t) = next_sjlj_build_catch_list (); 3711 append_to_statement_list (t, &BIND_EXPR_BODY (catch_seq)); 3712 } 3713 else 3714 catch_seq = next_sjlj_build_exc_extract (rethrow_decl); 3715 SET_EXPR_LOCATION (catch_seq, cur_try_context->end_try_locus); 3716 3717 /* Build the main register-and-try if statement. */ 3718 t = next_sjlj_build_enter_and_setjmp (); 3719 SET_EXPR_LOCATION (t, cur_try_context->try_locus); 3720 COND_EXPR_THEN (t) = catch_seq; 3721 COND_EXPR_ELSE (t) = cur_try_context->try_body; 3722 TREE_OPERAND (try_fin, 0) = t; 3723 3724 /* Build the complete FINALLY statement list. */ 3725 t = next_sjlj_build_try_exit (); 3726 t = build_stmt (COND_EXPR, 3727 c_common_truthvalue_conversion (rethrow_decl), 3728 NULL, t); 3729 SET_EXPR_LOCATION (t, cur_try_context->finally_locus); 3730 append_to_statement_list (t, &TREE_OPERAND (try_fin, 1)); 3731 3732 append_to_statement_list (cur_try_context->finally_body, 3733 &TREE_OPERAND (try_fin, 1)); 3734 3735 t = tree_cons (NULL, rethrow_decl, NULL); 3736 t = build_function_call (objc_exception_throw_decl, t); 3737 t = build_stmt (COND_EXPR, 3738 c_common_truthvalue_conversion (rethrow_decl), 3739 t, NULL); 3740 SET_EXPR_LOCATION (t, cur_try_context->end_finally_locus); 3741 append_to_statement_list (t, &TREE_OPERAND (try_fin, 1)); 3742 3743 return bind; 3744} 3745 3746/* Called just after parsing the @try and its associated BODY. We now 3747 must prepare for the tricky bits -- handling the catches and finally. */ 3748 3749void 3750objc_begin_try_stmt (location_t try_locus, tree body) 3751{ 3752 struct objc_try_context *c = xcalloc (1, sizeof (*c)); 3753 c->outer = cur_try_context; 3754 c->try_body = body; 3755 c->try_locus = try_locus; 3756 c->end_try_locus = input_location; 3757 cur_try_context = c; 3758 3759 objc_init_exceptions (); 3760 3761 if (flag_objc_sjlj_exceptions) 3762 objc_mark_locals_volatile (NULL); 3763} 3764 3765/* Called just after parsing "@catch (parm)". Open a binding level, 3766 enter DECL into the binding level, and initialize it. Leave the 3767 binding level open while the body of the compound statement is parsed. */ 3768 3769void 3770objc_begin_catch_clause (tree decl) 3771{ 3772 tree compound, type, t; 3773 3774 /* Begin a new scope that the entire catch clause will live in. */ 3775 compound = c_begin_compound_stmt (true); 3776 3777 /* The parser passed in a PARM_DECL, but what we really want is a VAR_DECL. */ 3778 decl = build_decl (VAR_DECL, DECL_NAME (decl), TREE_TYPE (decl)); 3779 lang_hooks.decls.pushdecl (decl); 3780 3781 /* Since a decl is required here by syntax, don't warn if its unused. */ 3782 /* ??? As opposed to __attribute__((unused))? Anyway, this appears to 3783 be what the previous objc implementation did. */ 3784 TREE_USED (decl) = 1; 3785 3786 /* Verify that the type of the catch is valid. It must be a pointer 3787 to an Objective-C class, or "id" (which is catch-all). */ 3788 type = TREE_TYPE (decl); 3789 3790 if (POINTER_TYPE_P (type) && objc_is_object_id (TREE_TYPE (type))) 3791 type = NULL; 3792 else if (!POINTER_TYPE_P (type) || !TYPED_OBJECT (TREE_TYPE (type))) 3793 { 3794 error ("@catch parameter is not a known Objective-C class type"); 3795 type = error_mark_node; 3796 } 3797 else if (cur_try_context->catch_list) 3798 { 3799 /* Examine previous @catch clauses and see if we've already 3800 caught the type in question. */ 3801 tree_stmt_iterator i = tsi_start (cur_try_context->catch_list); 3802 for (; !tsi_end_p (i); tsi_next (&i)) 3803 { 3804 tree stmt = tsi_stmt (i); 3805 t = CATCH_TYPES (stmt); 3806 if (t == error_mark_node) 3807 continue; 3808 if (!t || DERIVED_FROM_P (TREE_TYPE (t), TREE_TYPE (type))) 3809 { 3810 warning (0, "exception of type %<%T%> will be caught", 3811 TREE_TYPE (type)); 3812 warning (0, "%H by earlier handler for %<%T%>", 3813 EXPR_LOCUS (stmt), TREE_TYPE (t ? t : objc_object_type)); 3814 break; 3815 } 3816 } 3817 } 3818 3819 /* Record the data for the catch in the try context so that we can 3820 finalize it later. */ 3821 t = build_stmt (CATCH_EXPR, type, compound); 3822 cur_try_context->current_catch = t; 3823 3824 /* Initialize the decl from the EXC_PTR_EXPR we get from the runtime. */ 3825 t = objc_build_exc_ptr (); 3826 t = convert (TREE_TYPE (decl), t); 3827 t = build2 (MODIFY_EXPR, void_type_node, decl, t); 3828 add_stmt (t); 3829} 3830 3831/* Called just after parsing the closing brace of a @catch clause. Close 3832 the open binding level, and record a CATCH_EXPR for it. */ 3833 3834void 3835objc_finish_catch_clause (void) 3836{ 3837 tree c = cur_try_context->current_catch; 3838 cur_try_context->current_catch = NULL; 3839 cur_try_context->end_catch_locus = input_location; 3840 3841 CATCH_BODY (c) = c_end_compound_stmt (CATCH_BODY (c), 1); 3842 append_to_statement_list (c, &cur_try_context->catch_list); 3843} 3844 3845/* Called after parsing a @finally clause and its associated BODY. 3846 Record the body for later placement. */ 3847 3848void 3849objc_build_finally_clause (location_t finally_locus, tree body) 3850{ 3851 cur_try_context->finally_body = body; 3852 cur_try_context->finally_locus = finally_locus; 3853 cur_try_context->end_finally_locus = input_location; 3854} 3855 3856/* Called to finalize a @try construct. */ 3857 3858tree 3859objc_finish_try_stmt (void) 3860{ 3861 struct objc_try_context *c = cur_try_context; 3862 tree stmt; 3863 3864 if (c->catch_list == NULL && c->finally_body == NULL) 3865 error ("%<@try%> without %<@catch%> or %<@finally%>"); 3866 3867 /* If we're doing Darwin setjmp exceptions, build the big nasty. */ 3868 if (flag_objc_sjlj_exceptions) 3869 { 3870 if (!cur_try_context->finally_body) 3871 { 3872 cur_try_context->finally_locus = input_location; 3873 cur_try_context->end_finally_locus = input_location; 3874 } 3875 stmt = next_sjlj_build_try_catch_finally (); 3876 } 3877 else 3878 { 3879 /* Otherwise, nest the CATCH inside a FINALLY. */ 3880 stmt = c->try_body; 3881 if (c->catch_list) 3882 { 3883 stmt = build_stmt (TRY_CATCH_EXPR, stmt, c->catch_list); 3884 SET_EXPR_LOCATION (stmt, cur_try_context->try_locus); 3885 } 3886 if (c->finally_body) 3887 { 3888 stmt = build_stmt (TRY_FINALLY_EXPR, stmt, c->finally_body); 3889 SET_EXPR_LOCATION (stmt, cur_try_context->try_locus); 3890 } 3891 } 3892 add_stmt (stmt); 3893 3894 cur_try_context = c->outer; 3895 free (c); 3896 return stmt; 3897} 3898 3899tree 3900objc_build_throw_stmt (tree throw_expr) 3901{ 3902 tree args; 3903 3904 objc_init_exceptions (); 3905 3906 if (throw_expr == NULL) 3907 { 3908 /* If we're not inside a @catch block, there is no "current 3909 exception" to be rethrown. */ 3910 if (cur_try_context == NULL 3911 || cur_try_context->current_catch == NULL) 3912 { 3913 error ("%<@throw%> (rethrow) used outside of a @catch block"); 3914 return NULL_TREE; 3915 } 3916 3917 /* Otherwise the object is still sitting in the EXC_PTR_EXPR 3918 value that we get from the runtime. */ 3919 throw_expr = objc_build_exc_ptr (); 3920 } 3921 3922 /* A throw is just a call to the runtime throw function with the 3923 object as a parameter. */ 3924 args = tree_cons (NULL, throw_expr, NULL); 3925 return add_stmt (build_function_call (objc_exception_throw_decl, args)); 3926} 3927 3928tree 3929objc_build_synchronized (location_t start_locus, tree mutex, tree body) 3930{ 3931 tree args, call; 3932 3933 /* First lock the mutex. */ 3934 mutex = save_expr (mutex); 3935 args = tree_cons (NULL, mutex, NULL); 3936 call = build_function_call (objc_sync_enter_decl, args); 3937 SET_EXPR_LOCATION (call, start_locus); 3938 add_stmt (call); 3939 3940 /* Build the mutex unlock. */ 3941 args = tree_cons (NULL, mutex, NULL); 3942 call = build_function_call (objc_sync_exit_decl, args); 3943 SET_EXPR_LOCATION (call, input_location); 3944 3945 /* Put the that and the body in a TRY_FINALLY. */ 3946 objc_begin_try_stmt (start_locus, body); 3947 objc_build_finally_clause (input_location, call); 3948 return objc_finish_try_stmt (); 3949} 3950 3951 3952/* Predefine the following data type: 3953 3954 struct _objc_exception_data 3955 { 3956 int buf[OBJC_JBLEN]; 3957 void *pointers[4]; 3958 }; */ 3959 3960/* The following yuckiness should prevent users from having to #include 3961 <setjmp.h> in their code... */ 3962 3963/* Define to a harmless positive value so the below code doesn't die. */ 3964#ifndef OBJC_JBLEN 3965#define OBJC_JBLEN 18 3966#endif 3967 3968static void 3969build_next_objc_exception_stuff (void) 3970{ 3971 tree field_decl, field_decl_chain, index, temp_type; 3972 3973 objc_exception_data_template 3974 = start_struct (RECORD_TYPE, get_identifier (UTAG_EXCDATA)); 3975 3976 /* int buf[OBJC_JBLEN]; */ 3977 3978 index = build_index_type (build_int_cst (NULL_TREE, OBJC_JBLEN - 1)); 3979 field_decl = create_field_decl (build_array_type (integer_type_node, index), 3980 "buf"); 3981 field_decl_chain = field_decl; 3982 3983 /* void *pointers[4]; */ 3984 3985 index = build_index_type (build_int_cst (NULL_TREE, 4 - 1)); 3986 field_decl = create_field_decl (build_array_type (ptr_type_node, index), 3987 "pointers"); 3988 chainon (field_decl_chain, field_decl); 3989 3990 finish_struct (objc_exception_data_template, field_decl_chain, NULL_TREE); 3991 3992 /* int _setjmp(...); */ 3993 /* If the user includes <setjmp.h>, this shall be superseded by 3994 'int _setjmp(jmp_buf);' */ 3995 temp_type = build_function_type (integer_type_node, NULL_TREE); 3996 objc_setjmp_decl 3997 = builtin_function (TAG_SETJMP, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 3998 3999 /* id objc_exception_extract(struct _objc_exception_data *); */ 4000 temp_type 4001 = build_function_type (objc_object_type, 4002 tree_cons (NULL_TREE, 4003 build_pointer_type (objc_exception_data_template), 4004 OBJC_VOID_AT_END)); 4005 objc_exception_extract_decl 4006 = builtin_function (TAG_EXCEPTIONEXTRACT, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 4007 /* void objc_exception_try_enter(struct _objc_exception_data *); */ 4008 /* void objc_exception_try_exit(struct _objc_exception_data *); */ 4009 temp_type 4010 = build_function_type (void_type_node, 4011 tree_cons (NULL_TREE, 4012 build_pointer_type (objc_exception_data_template), 4013 OBJC_VOID_AT_END)); 4014 objc_exception_try_enter_decl 4015 = builtin_function (TAG_EXCEPTIONTRYENTER, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 4016 objc_exception_try_exit_decl 4017 = builtin_function (TAG_EXCEPTIONTRYEXIT, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 4018 4019 /* int objc_exception_match(id, id); */ 4020 temp_type 4021 = build_function_type (integer_type_node, 4022 tree_cons (NULL_TREE, objc_object_type, 4023 tree_cons (NULL_TREE, objc_object_type, 4024 OBJC_VOID_AT_END))); 4025 objc_exception_match_decl 4026 = builtin_function (TAG_EXCEPTIONMATCH, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 4027 4028 /* id objc_assign_ivar (id, id, unsigned int); */ 4029 /* id objc_assign_ivar_Fast (id, id, unsigned int) 4030 __attribute__ ((hard_coded_address (OFFS_ASSIGNIVAR_FAST))); */ 4031 temp_type 4032 = build_function_type (objc_object_type, 4033 tree_cons 4034 (NULL_TREE, objc_object_type, 4035 tree_cons (NULL_TREE, objc_object_type, 4036 tree_cons (NULL_TREE, 4037 unsigned_type_node, 4038 OBJC_VOID_AT_END)))); 4039 objc_assign_ivar_decl 4040 = builtin_function (TAG_ASSIGNIVAR, temp_type, 0, NOT_BUILT_IN, 4041 NULL, NULL_TREE); 4042#ifdef OFFS_ASSIGNIVAR_FAST 4043 objc_assign_ivar_fast_decl 4044 = builtin_function (TAG_ASSIGNIVAR_FAST, temp_type, 0, 4045 NOT_BUILT_IN, NULL, NULL_TREE); 4046 DECL_ATTRIBUTES (objc_assign_ivar_fast_decl) 4047 = tree_cons (get_identifier ("hard_coded_address"), 4048 build_int_cst (NULL_TREE, OFFS_ASSIGNIVAR_FAST), 4049 NULL_TREE); 4050#else 4051 /* Default to slower ivar method. */ 4052 objc_assign_ivar_fast_decl = objc_assign_ivar_decl; 4053#endif 4054 4055 /* id objc_assign_global (id, id *); */ 4056 /* id objc_assign_strongCast (id, id *); */ 4057 temp_type = build_function_type (objc_object_type, 4058 tree_cons (NULL_TREE, objc_object_type, 4059 tree_cons (NULL_TREE, build_pointer_type (objc_object_type), 4060 OBJC_VOID_AT_END))); 4061 objc_assign_global_decl 4062 = builtin_function (TAG_ASSIGNGLOBAL, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 4063 objc_assign_strong_cast_decl 4064 = builtin_function (TAG_ASSIGNSTRONGCAST, temp_type, 0, NOT_BUILT_IN, NULL, NULL_TREE); 4065} 4066 4067static void 4068build_objc_exception_stuff (void) 4069{ 4070 tree noreturn_list, nothrow_list, temp_type; 4071 4072 noreturn_list = tree_cons (get_identifier ("noreturn"), NULL, NULL); 4073 nothrow_list = tree_cons (get_identifier ("nothrow"), NULL, NULL); 4074 4075 /* void objc_exception_throw(id) __attribute__((noreturn)); */ 4076 /* void objc_sync_enter(id); */ 4077 /* void objc_sync_exit(id); */ 4078 temp_type = build_function_type (void_type_node, 4079 tree_cons (NULL_TREE, objc_object_type, 4080 OBJC_VOID_AT_END)); 4081 objc_exception_throw_decl 4082 = builtin_function (TAG_EXCEPTIONTHROW, temp_type, 0, NOT_BUILT_IN, NULL, 4083 noreturn_list); 4084 objc_sync_enter_decl 4085 = builtin_function (TAG_SYNCENTER, temp_type, 0, NOT_BUILT_IN, 4086 NULL, nothrow_list); 4087 objc_sync_exit_decl 4088 = builtin_function (TAG_SYNCEXIT, temp_type, 0, NOT_BUILT_IN, 4089 NULL, nothrow_list); 4090} 4091 4092/* Construct a C struct corresponding to ObjC class CLASS, with the same 4093 name as the class: 4094 4095 struct <classname> { 4096 struct _objc_class *isa; 4097 ... 4098 }; */ 4099 4100static void 4101build_private_template (tree class) 4102{ 4103 if (!CLASS_STATIC_TEMPLATE (class)) 4104 { 4105 tree record = objc_build_struct (class, 4106 get_class_ivars (class, false), 4107 CLASS_SUPER_NAME (class)); 4108 4109 /* Set the TREE_USED bit for this struct, so that stab generator 4110 can emit stabs for this struct type. */ 4111 if (flag_debug_only_used_symbols && TYPE_STUB_DECL (record)) 4112 TREE_USED (TYPE_STUB_DECL (record)) = 1; 4113 } 4114} 4115 4116/* Begin code generation for protocols... */ 4117 4118/* struct _objc_protocol { 4119 struct _objc_class *isa; 4120 char *protocol_name; 4121 struct _objc_protocol **protocol_list; 4122 struct _objc__method_prototype_list *instance_methods; 4123 struct _objc__method_prototype_list *class_methods; 4124 }; */ 4125 4126static void 4127build_protocol_template (void) 4128{ 4129 tree field_decl, field_decl_chain; 4130 4131 objc_protocol_template = start_struct (RECORD_TYPE, 4132 get_identifier (UTAG_PROTOCOL)); 4133 4134 /* struct _objc_class *isa; */ 4135 field_decl = create_field_decl (build_pointer_type 4136 (xref_tag (RECORD_TYPE, 4137 get_identifier (UTAG_CLASS))), 4138 "isa"); 4139 field_decl_chain = field_decl; 4140 4141 /* char *protocol_name; */ 4142 field_decl = create_field_decl (string_type_node, "protocol_name"); 4143 chainon (field_decl_chain, field_decl); 4144 4145 /* struct _objc_protocol **protocol_list; */ 4146 field_decl = create_field_decl (build_pointer_type 4147 (build_pointer_type 4148 (objc_protocol_template)), 4149 "protocol_list"); 4150 chainon (field_decl_chain, field_decl); 4151 4152 /* struct _objc__method_prototype_list *instance_methods; */ 4153 field_decl = create_field_decl (objc_method_proto_list_ptr, 4154 "instance_methods"); 4155 chainon (field_decl_chain, field_decl); 4156 4157 /* struct _objc__method_prototype_list *class_methods; */ 4158 field_decl = create_field_decl (objc_method_proto_list_ptr, 4159 "class_methods"); 4160 chainon (field_decl_chain, field_decl); 4161 4162 finish_struct (objc_protocol_template, field_decl_chain, NULL_TREE); 4163} 4164 4165static tree 4166build_descriptor_table_initializer (tree type, tree entries) 4167{ 4168 tree initlist = NULL_TREE; 4169 4170 do 4171 { 4172 tree eltlist = NULL_TREE; 4173 4174 eltlist 4175 = tree_cons (NULL_TREE, 4176 build_selector (METHOD_SEL_NAME (entries)), NULL_TREE); 4177 eltlist 4178 = tree_cons (NULL_TREE, 4179 add_objc_string (METHOD_ENCODING (entries), 4180 meth_var_types), 4181 eltlist); 4182 4183 initlist 4184 = tree_cons (NULL_TREE, 4185 objc_build_constructor (type, nreverse (eltlist)), 4186 initlist); 4187 4188 entries = TREE_CHAIN (entries); 4189 } 4190 while (entries); 4191 4192 return objc_build_constructor (build_array_type (type, 0), 4193 nreverse (initlist)); 4194} 4195 4196/* struct objc_method_prototype_list { 4197 int count; 4198 struct objc_method_prototype { 4199 SEL name; 4200 char *types; 4201 } list[1]; 4202 }; */ 4203 4204static tree 4205build_method_prototype_list_template (tree list_type, int size) 4206{ 4207 tree objc_ivar_list_record; 4208 tree field_decl, field_decl_chain; 4209 4210 /* Generate an unnamed struct definition. */ 4211 4212 objc_ivar_list_record = start_struct (RECORD_TYPE, NULL_TREE); 4213 4214 /* int method_count; */ 4215 field_decl = create_field_decl (integer_type_node, "method_count"); 4216 field_decl_chain = field_decl; 4217 4218 /* struct objc_method method_list[]; */ 4219 field_decl = create_field_decl (build_array_type 4220 (list_type, 4221 build_index_type 4222 (build_int_cst (NULL_TREE, size - 1))), 4223 "method_list"); 4224 chainon (field_decl_chain, field_decl); 4225 4226 finish_struct (objc_ivar_list_record, field_decl_chain, NULL_TREE); 4227 4228 return objc_ivar_list_record; 4229} 4230 4231static tree 4232build_method_prototype_template (void) 4233{ 4234 tree proto_record; 4235 tree field_decl, field_decl_chain; 4236 4237 proto_record 4238 = start_struct (RECORD_TYPE, get_identifier (UTAG_METHOD_PROTOTYPE)); 4239 4240 /* SEL _cmd; */ 4241 field_decl = create_field_decl (objc_selector_type, "_cmd"); 4242 field_decl_chain = field_decl; 4243 4244 /* char *method_types; */ 4245 field_decl = create_field_decl (string_type_node, "method_types"); 4246 chainon (field_decl_chain, field_decl); 4247 4248 finish_struct (proto_record, field_decl_chain, NULL_TREE); 4249 4250 return proto_record; 4251} 4252 4253static tree 4254objc_method_parm_type (tree type) 4255{ 4256 type = TREE_VALUE (TREE_TYPE (type)); 4257 if (TREE_CODE (type) == TYPE_DECL) 4258 type = TREE_TYPE (type); 4259 return type; 4260} 4261 4262static int 4263objc_encoded_type_size (tree type) 4264{ 4265 int sz = int_size_in_bytes (type); 4266 4267 /* Make all integer and enum types at least as large 4268 as an int. */ 4269 if (sz > 0 && INTEGRAL_TYPE_P (type)) 4270 sz = MAX (sz, int_size_in_bytes (integer_type_node)); 4271 /* Treat arrays as pointers, since that's how they're 4272 passed in. */ 4273 else if (TREE_CODE (type) == ARRAY_TYPE) 4274 sz = int_size_in_bytes (ptr_type_node); 4275 return sz; 4276} 4277 4278static tree 4279encode_method_prototype (tree method_decl) 4280{ 4281 tree parms; 4282 int parm_offset, i; 4283 char buf[40]; 4284 tree result; 4285 4286 /* ONEWAY and BYCOPY, for remote object are the only method qualifiers. */ 4287 encode_type_qualifiers (TREE_PURPOSE (TREE_TYPE (method_decl))); 4288 4289 /* Encode return type. */ 4290 encode_type (objc_method_parm_type (method_decl), 4291 obstack_object_size (&util_obstack), 4292 OBJC_ENCODE_INLINE_DEFS); 4293 4294 /* Stack size. */ 4295 /* The first two arguments (self and _cmd) are pointers; account for 4296 their size. */ 4297 i = int_size_in_bytes (ptr_type_node); 4298 parm_offset = 2 * i; 4299 for (parms = METHOD_SEL_ARGS (method_decl); parms; 4300 parms = TREE_CHAIN (parms)) 4301 { 4302 tree type = objc_method_parm_type (parms); 4303 int sz = objc_encoded_type_size (type); 4304 4305 /* If a type size is not known, bail out. */ 4306 if (sz < 0) 4307 { 4308 error ("type %q+D does not have a known size", 4309 type); 4310 /* Pretend that the encoding succeeded; the compilation will 4311 fail nevertheless. */ 4312 goto finish_encoding; 4313 } 4314 parm_offset += sz; 4315 } 4316 4317 sprintf (buf, "%d@0:%d", parm_offset, i); 4318 obstack_grow (&util_obstack, buf, strlen (buf)); 4319 4320 /* Argument types. */ 4321 parm_offset = 2 * i; 4322 for (parms = METHOD_SEL_ARGS (method_decl); parms; 4323 parms = TREE_CHAIN (parms)) 4324 { 4325 tree type = objc_method_parm_type (parms); 4326 4327 /* Process argument qualifiers for user supplied arguments. */ 4328 encode_type_qualifiers (TREE_PURPOSE (TREE_TYPE (parms))); 4329 4330 /* Type. */ 4331 encode_type (type, obstack_object_size (&util_obstack), 4332 OBJC_ENCODE_INLINE_DEFS); 4333 4334 /* Compute offset. */ 4335 sprintf (buf, "%d", parm_offset); 4336 parm_offset += objc_encoded_type_size (type); 4337 4338 obstack_grow (&util_obstack, buf, strlen (buf)); 4339 } 4340 4341 finish_encoding: 4342 obstack_1grow (&util_obstack, '\0'); 4343 result = get_identifier (obstack_finish (&util_obstack)); 4344 obstack_free (&util_obstack, util_firstobj); 4345 return result; 4346} 4347 4348static tree 4349generate_descriptor_table (tree type, const char *name, int size, tree list, 4350 tree proto) 4351{ 4352 tree decl, initlist; 4353 4354 decl = start_var_decl (type, synth_id_with_class_suffix (name, proto)); 4355 4356 initlist = build_tree_list (NULL_TREE, build_int_cst (NULL_TREE, size)); 4357 initlist = tree_cons (NULL_TREE, list, initlist); 4358 4359 finish_var_decl (decl, objc_build_constructor (type, nreverse (initlist))); 4360 4361 return decl; 4362} 4363 4364static void 4365generate_method_descriptors (tree protocol) 4366{ 4367 tree initlist, chain, method_list_template; 4368 int size; 4369 4370 if (!objc_method_prototype_template) 4371 objc_method_prototype_template = build_method_prototype_template (); 4372 4373 chain = PROTOCOL_CLS_METHODS (protocol); 4374 if (chain) 4375 { 4376 size = list_length (chain); 4377 4378 method_list_template 4379 = build_method_prototype_list_template (objc_method_prototype_template, 4380 size); 4381 4382 initlist 4383 = build_descriptor_table_initializer (objc_method_prototype_template, 4384 chain); 4385 4386 UOBJC_CLASS_METHODS_decl 4387 = generate_descriptor_table (method_list_template, 4388 "_OBJC_PROTOCOL_CLASS_METHODS", 4389 size, initlist, protocol); 4390 } 4391 else 4392 UOBJC_CLASS_METHODS_decl = 0; 4393 4394 chain = PROTOCOL_NST_METHODS (protocol); 4395 if (chain) 4396 { 4397 size = list_length (chain); 4398 4399 method_list_template 4400 = build_method_prototype_list_template (objc_method_prototype_template, 4401 size); 4402 initlist 4403 = build_descriptor_table_initializer (objc_method_prototype_template, 4404 chain); 4405 4406 UOBJC_INSTANCE_METHODS_decl 4407 = generate_descriptor_table (method_list_template, 4408 "_OBJC_PROTOCOL_INSTANCE_METHODS", 4409 size, initlist, protocol); 4410 } 4411 else 4412 UOBJC_INSTANCE_METHODS_decl = 0; 4413} 4414 4415static void 4416generate_protocol_references (tree plist) 4417{ 4418 tree lproto; 4419 4420 /* Forward declare protocols referenced. */ 4421 for (lproto = plist; lproto; lproto = TREE_CHAIN (lproto)) 4422 { 4423 tree proto = TREE_VALUE (lproto); 4424 4425 if (TREE_CODE (proto) == PROTOCOL_INTERFACE_TYPE 4426 && PROTOCOL_NAME (proto)) 4427 { 4428 if (! PROTOCOL_FORWARD_DECL (proto)) 4429 build_protocol_reference (proto); 4430 4431 if (PROTOCOL_LIST (proto)) 4432 generate_protocol_references (PROTOCOL_LIST (proto)); 4433 } 4434 } 4435} 4436 4437/* Generate either '- .cxx_construct' or '- .cxx_destruct' for the 4438 current class. */ 4439#ifdef OBJCPLUS 4440static void 4441objc_generate_cxx_ctor_or_dtor (bool dtor) 4442{ 4443 tree fn, body, compound_stmt, ivar; 4444 4445 /* - (id) .cxx_construct { ... return self; } */ 4446 /* - (void) .cxx_construct { ... } */ 4447 4448 objc_set_method_type (MINUS_EXPR); 4449 objc_start_method_definition 4450 (objc_build_method_signature (build_tree_list (NULL_TREE, 4451 dtor 4452 ? void_type_node 4453 : objc_object_type), 4454 get_identifier (dtor 4455 ? TAG_CXX_DESTRUCT 4456 : TAG_CXX_CONSTRUCT), 4457 make_node (TREE_LIST), 4458 false)); 4459 body = begin_function_body (); 4460 compound_stmt = begin_compound_stmt (0); 4461 4462 ivar = CLASS_IVARS (implementation_template); 4463 /* Destroy ivars in reverse order. */ 4464 if (dtor) 4465 ivar = nreverse (copy_list (ivar)); 4466 4467 for (; ivar; ivar = TREE_CHAIN (ivar)) 4468 { 4469 if (TREE_CODE (ivar) == FIELD_DECL) 4470 { 4471 tree type = TREE_TYPE (ivar); 4472 4473 /* Call the ivar's default constructor or destructor. Do not 4474 call the destructor unless a corresponding constructor call 4475 has also been made (or is not needed). */ 4476 if (IS_AGGR_TYPE (type) 4477 && (dtor 4478 ? (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) 4479 && (!TYPE_NEEDS_CONSTRUCTING (type) 4480 || TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) 4481 : (TYPE_NEEDS_CONSTRUCTING (type) 4482 && TYPE_HAS_DEFAULT_CONSTRUCTOR (type)))) 4483 finish_expr_stmt 4484 (build_special_member_call 4485 (build_ivar_reference (DECL_NAME (ivar)), 4486 dtor ? complete_dtor_identifier : complete_ctor_identifier, 4487 NULL_TREE, type, LOOKUP_NORMAL)); 4488 } 4489 } 4490 4491 /* The constructor returns 'self'. */ 4492 if (!dtor) 4493 finish_return_stmt (self_decl); 4494 4495 finish_compound_stmt (compound_stmt); 4496 finish_function_body (body); 4497 fn = current_function_decl; 4498 finish_function (); 4499 objc_finish_method_definition (fn); 4500} 4501 4502/* The following routine will examine the current @interface for any 4503 non-POD C++ ivars requiring non-trivial construction and/or 4504 destruction, and then synthesize special '- .cxx_construct' and/or 4505 '- .cxx_destruct' methods which will run the appropriate 4506 construction or destruction code. Note that ivars inherited from 4507 super-classes are _not_ considered. */ 4508static void 4509objc_generate_cxx_cdtors (void) 4510{ 4511 bool need_ctor = false, need_dtor = false; 4512 tree ivar; 4513 4514 /* We do not want to do this for categories, since they do not have 4515 their own ivars. */ 4516 4517 if (TREE_CODE (objc_implementation_context) != CLASS_IMPLEMENTATION_TYPE) 4518 return; 4519 4520 /* First, determine if we even need a constructor and/or destructor. */ 4521 4522 for (ivar = CLASS_IVARS (implementation_template); ivar; 4523 ivar = TREE_CHAIN (ivar)) 4524 { 4525 if (TREE_CODE (ivar) == FIELD_DECL) 4526 { 4527 tree type = TREE_TYPE (ivar); 4528 4529 if (IS_AGGR_TYPE (type)) 4530 { 4531 if (TYPE_NEEDS_CONSTRUCTING (type) 4532 && TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) 4533 /* NB: If a default constructor is not available, we will not 4534 be able to initialize this ivar; the add_instance_variable() 4535 routine will already have warned about this. */ 4536 need_ctor = true; 4537 4538 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) 4539 && (!TYPE_NEEDS_CONSTRUCTING (type) 4540 || TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) 4541 /* NB: If a default constructor is not available, we will not 4542 call the destructor either, for symmetry. */ 4543 need_dtor = true; 4544 } 4545 } 4546 } 4547 4548 /* Generate '- .cxx_construct' if needed. */ 4549 4550 if (need_ctor) 4551 objc_generate_cxx_ctor_or_dtor (false); 4552 4553 /* Generate '- .cxx_destruct' if needed. */ 4554 4555 if (need_dtor) 4556 objc_generate_cxx_ctor_or_dtor (true); 4557 4558 /* The 'imp_list' variable points at an imp_entry record for the current 4559 @implementation. Record the existence of '- .cxx_construct' and/or 4560 '- .cxx_destruct' methods therein; it will be included in the 4561 metadata for the class. */ 4562 if (flag_next_runtime) 4563 imp_list->has_cxx_cdtors = (need_ctor || need_dtor); 4564} 4565#endif 4566 4567/* For each protocol which was referenced either from a @protocol() 4568 expression, or because a class/category implements it (then a 4569 pointer to the protocol is stored in the struct describing the 4570 class/category), we create a statically allocated instance of the 4571 Protocol class. The code is written in such a way as to generate 4572 as few Protocol objects as possible; we generate a unique Protocol 4573 instance for each protocol, and we don't generate a Protocol 4574 instance if the protocol is never referenced (either from a 4575 @protocol() or from a class/category implementation). These 4576 statically allocated objects can be referred to via the static 4577 (that is, private to this module) symbols _OBJC_PROTOCOL_n. 4578 4579 The statically allocated Protocol objects that we generate here 4580 need to be fixed up at runtime in order to be used: the 'isa' 4581 pointer of the objects need to be set up to point to the 'Protocol' 4582 class, as known at runtime. 4583 4584 The NeXT runtime fixes up all protocols at program startup time, 4585 before main() is entered. It uses a low-level trick to look up all 4586 those symbols, then loops on them and fixes them up. 4587 4588 The GNU runtime as well fixes up all protocols before user code 4589 from the module is executed; it requires pointers to those symbols 4590 to be put in the objc_symtab (which is then passed as argument to 4591 the function __objc_exec_class() which the compiler sets up to be 4592 executed automatically when the module is loaded); setup of those 4593 Protocol objects happen in two ways in the GNU runtime: all 4594 Protocol objects referred to by a class or category implementation 4595 are fixed up when the class/category is loaded; all Protocol 4596 objects referred to by a @protocol() expression are added by the 4597 compiler to the list of statically allocated instances to fixup 4598 (the same list holding the statically allocated constant string 4599 objects). Because, as explained above, the compiler generates as 4600 few Protocol objects as possible, some Protocol object might end up 4601 being referenced multiple times when compiled with the GNU runtime, 4602 and end up being fixed up multiple times at runtime initialization. 4603 But that doesn't hurt, it's just a little inefficient. */ 4604 4605static void 4606generate_protocols (void) 4607{ 4608 tree p, encoding; 4609 tree decl; 4610 tree initlist, protocol_name_expr, refs_decl, refs_expr; 4611 4612 /* If a protocol was directly referenced, pull in indirect references. */ 4613 for (p = protocol_chain; p; p = TREE_CHAIN (p)) 4614 if (PROTOCOL_FORWARD_DECL (p) && PROTOCOL_LIST (p)) 4615 generate_protocol_references (PROTOCOL_LIST (p)); 4616 4617 for (p = protocol_chain; p; p = TREE_CHAIN (p)) 4618 { 4619 tree nst_methods = PROTOCOL_NST_METHODS (p); 4620 tree cls_methods = PROTOCOL_CLS_METHODS (p); 4621 4622 /* If protocol wasn't referenced, don't generate any code. */ 4623 decl = PROTOCOL_FORWARD_DECL (p); 4624 4625 if (!decl) 4626 continue; 4627 4628 /* Make sure we link in the Protocol class. */ 4629 add_class_reference (get_identifier (PROTOCOL_OBJECT_CLASS_NAME)); 4630 4631 while (nst_methods) 4632 { 4633 if (! METHOD_ENCODING (nst_methods)) 4634 { 4635 encoding = encode_method_prototype (nst_methods); 4636 METHOD_ENCODING (nst_methods) = encoding; 4637 } 4638 nst_methods = TREE_CHAIN (nst_methods); 4639 } 4640 4641 while (cls_methods) 4642 { 4643 if (! METHOD_ENCODING (cls_methods)) 4644 { 4645 encoding = encode_method_prototype (cls_methods); 4646 METHOD_ENCODING (cls_methods) = encoding; 4647 } 4648 4649 cls_methods = TREE_CHAIN (cls_methods); 4650 } 4651 generate_method_descriptors (p); 4652 4653 if (PROTOCOL_LIST (p)) 4654 refs_decl = generate_protocol_list (p); 4655 else 4656 refs_decl = 0; 4657 4658 /* static struct objc_protocol _OBJC_PROTOCOL_<mumble>; */ 4659 protocol_name_expr = add_objc_string (PROTOCOL_NAME (p), class_names); 4660 4661 if (refs_decl) 4662 refs_expr = convert (build_pointer_type (build_pointer_type 4663 (objc_protocol_template)), 4664 build_unary_op (ADDR_EXPR, refs_decl, 0)); 4665 else 4666 refs_expr = build_int_cst (NULL_TREE, 0); 4667 4668 /* UOBJC_INSTANCE_METHODS_decl/UOBJC_CLASS_METHODS_decl are set 4669 by generate_method_descriptors, which is called above. */ 4670 initlist = build_protocol_initializer (TREE_TYPE (decl), 4671 protocol_name_expr, refs_expr, 4672 UOBJC_INSTANCE_METHODS_decl, 4673 UOBJC_CLASS_METHODS_decl); 4674 finish_var_decl (decl, initlist); 4675 } 4676} 4677 4678static tree 4679build_protocol_initializer (tree type, tree protocol_name, 4680 tree protocol_list, tree instance_methods, 4681 tree class_methods) 4682{ 4683 tree initlist = NULL_TREE, expr; 4684 tree cast_type = build_pointer_type 4685 (xref_tag (RECORD_TYPE, 4686 get_identifier (UTAG_CLASS))); 4687 4688 /* Filling the "isa" in with one allows the runtime system to 4689 detect that the version change...should remove before final release. */ 4690 4691 expr = build_int_cst (cast_type, PROTOCOL_VERSION); 4692 initlist = tree_cons (NULL_TREE, expr, initlist); 4693 initlist = tree_cons (NULL_TREE, protocol_name, initlist); 4694 initlist = tree_cons (NULL_TREE, protocol_list, initlist); 4695 4696 if (!instance_methods) 4697 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 4698 else 4699 { 4700 expr = convert (objc_method_proto_list_ptr, 4701 build_unary_op (ADDR_EXPR, instance_methods, 0)); 4702 initlist = tree_cons (NULL_TREE, expr, initlist); 4703 } 4704 4705 if (!class_methods) 4706 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 4707 else 4708 { 4709 expr = convert (objc_method_proto_list_ptr, 4710 build_unary_op (ADDR_EXPR, class_methods, 0)); 4711 initlist = tree_cons (NULL_TREE, expr, initlist); 4712 } 4713 4714 return objc_build_constructor (type, nreverse (initlist)); 4715} 4716 4717/* struct _objc_category { 4718 char *category_name; 4719 char *class_name; 4720 struct _objc_method_list *instance_methods; 4721 struct _objc_method_list *class_methods; 4722 struct _objc_protocol_list *protocols; 4723 }; */ 4724 4725static void 4726build_category_template (void) 4727{ 4728 tree field_decl, field_decl_chain; 4729 4730 objc_category_template = start_struct (RECORD_TYPE, 4731 get_identifier (UTAG_CATEGORY)); 4732 4733 /* char *category_name; */ 4734 field_decl = create_field_decl (string_type_node, "category_name"); 4735 field_decl_chain = field_decl; 4736 4737 /* char *class_name; */ 4738 field_decl = create_field_decl (string_type_node, "class_name"); 4739 chainon (field_decl_chain, field_decl); 4740 4741 /* struct _objc_method_list *instance_methods; */ 4742 field_decl = create_field_decl (objc_method_list_ptr, 4743 "instance_methods"); 4744 chainon (field_decl_chain, field_decl); 4745 4746 /* struct _objc_method_list *class_methods; */ 4747 field_decl = create_field_decl (objc_method_list_ptr, 4748 "class_methods"); 4749 chainon (field_decl_chain, field_decl); 4750 4751 /* struct _objc_protocol **protocol_list; */ 4752 field_decl = create_field_decl (build_pointer_type 4753 (build_pointer_type 4754 (objc_protocol_template)), 4755 "protocol_list"); 4756 chainon (field_decl_chain, field_decl); 4757 4758 finish_struct (objc_category_template, field_decl_chain, NULL_TREE); 4759} 4760 4761/* struct _objc_selector { 4762 SEL sel_id; 4763 char *sel_type; 4764 }; */ 4765 4766static void 4767build_selector_template (void) 4768{ 4769 4770 tree field_decl, field_decl_chain; 4771 4772 objc_selector_template 4773 = start_struct (RECORD_TYPE, get_identifier (UTAG_SELECTOR)); 4774 4775 /* SEL sel_id; */ 4776 field_decl = create_field_decl (objc_selector_type, "sel_id"); 4777 field_decl_chain = field_decl; 4778 4779 /* char *sel_type; */ 4780 field_decl = create_field_decl (string_type_node, "sel_type"); 4781 chainon (field_decl_chain, field_decl); 4782 4783 finish_struct (objc_selector_template, field_decl_chain, NULL_TREE); 4784} 4785 4786/* struct _objc_class { 4787 struct _objc_class *isa; 4788 struct _objc_class *super_class; 4789 char *name; 4790 long version; 4791 long info; 4792 long instance_size; 4793 struct _objc_ivar_list *ivars; 4794 struct _objc_method_list *methods; 4795 #ifdef __NEXT_RUNTIME__ 4796 struct objc_cache *cache; 4797 #else 4798 struct sarray *dtable; 4799 struct _objc_class *subclass_list; 4800 struct _objc_class *sibling_class; 4801 #endif 4802 struct _objc_protocol_list *protocols; 4803 #ifdef __NEXT_RUNTIME__ 4804 void *sel_id; 4805 #endif 4806 void *gc_object_type; 4807 }; */ 4808 4809/* NB: The 'sel_id' and 'gc_object_type' fields are not being used by 4810 the NeXT/Apple runtime; still, the compiler must generate them to 4811 maintain backward binary compatibility (and to allow for future 4812 expansion). */ 4813 4814static void 4815build_class_template (void) 4816{ 4817 tree field_decl, field_decl_chain; 4818 4819 objc_class_template 4820 = start_struct (RECORD_TYPE, get_identifier (UTAG_CLASS)); 4821 4822 /* struct _objc_class *isa; */ 4823 field_decl = create_field_decl (build_pointer_type (objc_class_template), 4824 "isa"); 4825 field_decl_chain = field_decl; 4826 4827 /* struct _objc_class *super_class; */ 4828 field_decl = create_field_decl (build_pointer_type (objc_class_template), 4829 "super_class"); 4830 chainon (field_decl_chain, field_decl); 4831 4832 /* char *name; */ 4833 field_decl = create_field_decl (string_type_node, "name"); 4834 chainon (field_decl_chain, field_decl); 4835 4836 /* long version; */ 4837 field_decl = create_field_decl (long_integer_type_node, "version"); 4838 chainon (field_decl_chain, field_decl); 4839 4840 /* long info; */ 4841 field_decl = create_field_decl (long_integer_type_node, "info"); 4842 chainon (field_decl_chain, field_decl); 4843 4844 /* long instance_size; */ 4845 field_decl = create_field_decl (long_integer_type_node, "instance_size"); 4846 chainon (field_decl_chain, field_decl); 4847 4848 /* struct _objc_ivar_list *ivars; */ 4849 field_decl = create_field_decl (objc_ivar_list_ptr, 4850 "ivars"); 4851 chainon (field_decl_chain, field_decl); 4852 4853 /* struct _objc_method_list *methods; */ 4854 field_decl = create_field_decl (objc_method_list_ptr, 4855 "methods"); 4856 chainon (field_decl_chain, field_decl); 4857 4858 if (flag_next_runtime) 4859 { 4860 /* struct objc_cache *cache; */ 4861 field_decl = create_field_decl (build_pointer_type 4862 (xref_tag (RECORD_TYPE, 4863 get_identifier 4864 ("objc_cache"))), 4865 "cache"); 4866 chainon (field_decl_chain, field_decl); 4867 } 4868 else 4869 { 4870 /* struct sarray *dtable; */ 4871 field_decl = create_field_decl (build_pointer_type 4872 (xref_tag (RECORD_TYPE, 4873 get_identifier 4874 ("sarray"))), 4875 "dtable"); 4876 chainon (field_decl_chain, field_decl); 4877 4878 /* struct objc_class *subclass_list; */ 4879 field_decl = create_field_decl (build_pointer_type 4880 (objc_class_template), 4881 "subclass_list"); 4882 chainon (field_decl_chain, field_decl); 4883 4884 /* struct objc_class *sibling_class; */ 4885 field_decl = create_field_decl (build_pointer_type 4886 (objc_class_template), 4887 "sibling_class"); 4888 chainon (field_decl_chain, field_decl); 4889 } 4890 4891 /* struct _objc_protocol **protocol_list; */ 4892 field_decl = create_field_decl (build_pointer_type 4893 (build_pointer_type 4894 (xref_tag (RECORD_TYPE, 4895 get_identifier 4896 (UTAG_PROTOCOL)))), 4897 "protocol_list"); 4898 chainon (field_decl_chain, field_decl); 4899 4900 if (flag_next_runtime) 4901 { 4902 /* void *sel_id; */ 4903 field_decl = create_field_decl (build_pointer_type (void_type_node), 4904 "sel_id"); 4905 chainon (field_decl_chain, field_decl); 4906 } 4907 4908 /* void *gc_object_type; */ 4909 field_decl = create_field_decl (build_pointer_type (void_type_node), 4910 "gc_object_type"); 4911 chainon (field_decl_chain, field_decl); 4912 4913 finish_struct (objc_class_template, field_decl_chain, NULL_TREE); 4914} 4915 4916/* Generate appropriate forward declarations for an implementation. */ 4917 4918static void 4919synth_forward_declarations (void) 4920{ 4921 tree an_id; 4922 4923 /* static struct objc_class _OBJC_CLASS_<my_name>; */ 4924 UOBJC_CLASS_decl = build_metadata_decl ("_OBJC_CLASS", 4925 objc_class_template); 4926 4927 /* static struct objc_class _OBJC_METACLASS_<my_name>; */ 4928 UOBJC_METACLASS_decl = build_metadata_decl ("_OBJC_METACLASS", 4929 objc_class_template); 4930 4931 /* Pre-build the following entities - for speed/convenience. */ 4932 4933 an_id = get_identifier ("super_class"); 4934 ucls_super_ref = objc_build_component_ref (UOBJC_CLASS_decl, an_id); 4935 uucls_super_ref = objc_build_component_ref (UOBJC_METACLASS_decl, an_id); 4936} 4937 4938static void 4939error_with_ivar (const char *message, tree decl) 4940{ 4941 error ("%J%s %qs", decl, 4942 message, gen_declaration (decl)); 4943 4944} 4945 4946static void 4947check_ivars (tree inter, tree imp) 4948{ 4949 tree intdecls = CLASS_RAW_IVARS (inter); 4950 tree impdecls = CLASS_RAW_IVARS (imp); 4951 4952 while (1) 4953 { 4954 tree t1, t2; 4955 4956#ifdef OBJCPLUS 4957 if (intdecls && TREE_CODE (intdecls) == TYPE_DECL) 4958 intdecls = TREE_CHAIN (intdecls); 4959#endif 4960 if (intdecls == 0 && impdecls == 0) 4961 break; 4962 if (intdecls == 0 || impdecls == 0) 4963 { 4964 error ("inconsistent instance variable specification"); 4965 break; 4966 } 4967 4968 t1 = TREE_TYPE (intdecls); t2 = TREE_TYPE (impdecls); 4969 4970 if (!comptypes (t1, t2) 4971 || !tree_int_cst_equal (DECL_INITIAL (intdecls), 4972 DECL_INITIAL (impdecls))) 4973 { 4974 if (DECL_NAME (intdecls) == DECL_NAME (impdecls)) 4975 { 4976 error_with_ivar ("conflicting instance variable type", 4977 impdecls); 4978 error_with_ivar ("previous declaration of", 4979 intdecls); 4980 } 4981 else /* both the type and the name don't match */ 4982 { 4983 error ("inconsistent instance variable specification"); 4984 break; 4985 } 4986 } 4987 4988 else if (DECL_NAME (intdecls) != DECL_NAME (impdecls)) 4989 { 4990 error_with_ivar ("conflicting instance variable name", 4991 impdecls); 4992 error_with_ivar ("previous declaration of", 4993 intdecls); 4994 } 4995 4996 intdecls = TREE_CHAIN (intdecls); 4997 impdecls = TREE_CHAIN (impdecls); 4998 } 4999} 5000 5001/* Set 'objc_super_template' to the data type node for 'struct _objc_super'. 5002 This needs to be done just once per compilation. */ 5003 5004/* struct _objc_super { 5005 struct _objc_object *self; 5006 struct _objc_class *super_class; 5007 }; */ 5008 5009static void 5010build_super_template (void) 5011{ 5012 tree field_decl, field_decl_chain; 5013 5014 objc_super_template = start_struct (RECORD_TYPE, get_identifier (UTAG_SUPER)); 5015 5016 /* struct _objc_object *self; */ 5017 field_decl = create_field_decl (objc_object_type, "self"); 5018 field_decl_chain = field_decl; 5019 5020 /* struct _objc_class *super_class; */ 5021 field_decl = create_field_decl (build_pointer_type (objc_class_template), 5022 "super_class"); 5023 chainon (field_decl_chain, field_decl); 5024 5025 finish_struct (objc_super_template, field_decl_chain, NULL_TREE); 5026} 5027 5028/* struct _objc_ivar { 5029 char *ivar_name; 5030 char *ivar_type; 5031 int ivar_offset; 5032 }; */ 5033 5034static tree 5035build_ivar_template (void) 5036{ 5037 tree objc_ivar_id, objc_ivar_record; 5038 tree field_decl, field_decl_chain; 5039 5040 objc_ivar_id = get_identifier (UTAG_IVAR); 5041 objc_ivar_record = start_struct (RECORD_TYPE, objc_ivar_id); 5042 5043 /* char *ivar_name; */ 5044 field_decl = create_field_decl (string_type_node, "ivar_name"); 5045 field_decl_chain = field_decl; 5046 5047 /* char *ivar_type; */ 5048 field_decl = create_field_decl (string_type_node, "ivar_type"); 5049 chainon (field_decl_chain, field_decl); 5050 5051 /* int ivar_offset; */ 5052 field_decl = create_field_decl (integer_type_node, "ivar_offset"); 5053 chainon (field_decl_chain, field_decl); 5054 5055 finish_struct (objc_ivar_record, field_decl_chain, NULL_TREE); 5056 5057 return objc_ivar_record; 5058} 5059 5060/* struct { 5061 int ivar_count; 5062 struct objc_ivar ivar_list[ivar_count]; 5063 }; */ 5064 5065static tree 5066build_ivar_list_template (tree list_type, int size) 5067{ 5068 tree objc_ivar_list_record; 5069 tree field_decl, field_decl_chain; 5070 5071 objc_ivar_list_record = start_struct (RECORD_TYPE, NULL_TREE); 5072 5073 /* int ivar_count; */ 5074 field_decl = create_field_decl (integer_type_node, "ivar_count"); 5075 field_decl_chain = field_decl; 5076 5077 /* struct objc_ivar ivar_list[]; */ 5078 field_decl = create_field_decl (build_array_type 5079 (list_type, 5080 build_index_type 5081 (build_int_cst (NULL_TREE, size - 1))), 5082 "ivar_list"); 5083 chainon (field_decl_chain, field_decl); 5084 5085 finish_struct (objc_ivar_list_record, field_decl_chain, NULL_TREE); 5086 5087 return objc_ivar_list_record; 5088} 5089 5090/* struct { 5091 struct _objc__method_prototype_list *method_next; 5092 int method_count; 5093 struct objc_method method_list[method_count]; 5094 }; */ 5095 5096static tree 5097build_method_list_template (tree list_type, int size) 5098{ 5099 tree objc_ivar_list_record; 5100 tree field_decl, field_decl_chain; 5101 5102 objc_ivar_list_record = start_struct (RECORD_TYPE, NULL_TREE); 5103 5104 /* struct _objc__method_prototype_list *method_next; */ 5105 field_decl = create_field_decl (objc_method_proto_list_ptr, 5106 "method_next"); 5107 field_decl_chain = field_decl; 5108 5109 /* int method_count; */ 5110 field_decl = create_field_decl (integer_type_node, "method_count"); 5111 chainon (field_decl_chain, field_decl); 5112 5113 /* struct objc_method method_list[]; */ 5114 field_decl = create_field_decl (build_array_type 5115 (list_type, 5116 build_index_type 5117 (build_int_cst (NULL_TREE, size - 1))), 5118 "method_list"); 5119 chainon (field_decl_chain, field_decl); 5120 5121 finish_struct (objc_ivar_list_record, field_decl_chain, NULL_TREE); 5122 5123 return objc_ivar_list_record; 5124} 5125 5126static tree 5127build_ivar_list_initializer (tree type, tree field_decl) 5128{ 5129 tree initlist = NULL_TREE; 5130 5131 do 5132 { 5133 tree ivar = NULL_TREE; 5134 5135 /* Set name. */ 5136 if (DECL_NAME (field_decl)) 5137 ivar = tree_cons (NULL_TREE, 5138 add_objc_string (DECL_NAME (field_decl), 5139 meth_var_names), 5140 ivar); 5141 else 5142 /* Unnamed bit-field ivar (yuck). */ 5143 ivar = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), ivar); 5144 5145 /* Set type. */ 5146 encode_field_decl (field_decl, 5147 obstack_object_size (&util_obstack), 5148 OBJC_ENCODE_DONT_INLINE_DEFS); 5149 5150 /* Null terminate string. */ 5151 obstack_1grow (&util_obstack, 0); 5152 ivar 5153 = tree_cons 5154 (NULL_TREE, 5155 add_objc_string (get_identifier (obstack_finish (&util_obstack)), 5156 meth_var_types), 5157 ivar); 5158 obstack_free (&util_obstack, util_firstobj); 5159 5160 /* Set offset. */ 5161 ivar = tree_cons (NULL_TREE, byte_position (field_decl), ivar); 5162 initlist = tree_cons (NULL_TREE, 5163 objc_build_constructor (type, nreverse (ivar)), 5164 initlist); 5165 do 5166 field_decl = TREE_CHAIN (field_decl); 5167 while (field_decl && TREE_CODE (field_decl) != FIELD_DECL); 5168 } 5169 while (field_decl); 5170 5171 return objc_build_constructor (build_array_type (type, 0), 5172 nreverse (initlist)); 5173} 5174 5175static tree 5176generate_ivars_list (tree type, const char *name, int size, tree list) 5177{ 5178 tree decl, initlist; 5179 5180 decl = start_var_decl (type, synth_id_with_class_suffix 5181 (name, objc_implementation_context)); 5182 5183 initlist = build_tree_list (NULL_TREE, build_int_cst (NULL_TREE, size)); 5184 initlist = tree_cons (NULL_TREE, list, initlist); 5185 5186 finish_var_decl (decl, 5187 objc_build_constructor (TREE_TYPE (decl), 5188 nreverse (initlist))); 5189 5190 return decl; 5191} 5192 5193/* Count only the fields occurring in T. */ 5194 5195static int 5196ivar_list_length (tree t) 5197{ 5198 int count = 0; 5199 5200 for (; t; t = TREE_CHAIN (t)) 5201 if (TREE_CODE (t) == FIELD_DECL) 5202 ++count; 5203 5204 return count; 5205} 5206 5207static void 5208generate_ivar_lists (void) 5209{ 5210 tree initlist, ivar_list_template, chain; 5211 int size; 5212 5213 generating_instance_variables = 1; 5214 5215 if (!objc_ivar_template) 5216 objc_ivar_template = build_ivar_template (); 5217 5218 /* Only generate class variables for the root of the inheritance 5219 hierarchy since these will be the same for every class. */ 5220 5221 if (CLASS_SUPER_NAME (implementation_template) == NULL_TREE 5222 && (chain = TYPE_FIELDS (objc_class_template))) 5223 { 5224 size = ivar_list_length (chain); 5225 5226 ivar_list_template = build_ivar_list_template (objc_ivar_template, size); 5227 initlist = build_ivar_list_initializer (objc_ivar_template, chain); 5228 5229 UOBJC_CLASS_VARIABLES_decl 5230 = generate_ivars_list (ivar_list_template, "_OBJC_CLASS_VARIABLES", 5231 size, initlist); 5232 } 5233 else 5234 UOBJC_CLASS_VARIABLES_decl = 0; 5235 5236 chain = CLASS_IVARS (implementation_template); 5237 if (chain) 5238 { 5239 size = ivar_list_length (chain); 5240 ivar_list_template = build_ivar_list_template (objc_ivar_template, size); 5241 initlist = build_ivar_list_initializer (objc_ivar_template, chain); 5242 5243 UOBJC_INSTANCE_VARIABLES_decl 5244 = generate_ivars_list (ivar_list_template, "_OBJC_INSTANCE_VARIABLES", 5245 size, initlist); 5246 } 5247 else 5248 UOBJC_INSTANCE_VARIABLES_decl = 0; 5249 5250 generating_instance_variables = 0; 5251} 5252 5253static tree 5254build_dispatch_table_initializer (tree type, tree entries) 5255{ 5256 tree initlist = NULL_TREE; 5257 5258 do 5259 { 5260 tree elemlist = NULL_TREE; 5261 5262 elemlist = tree_cons (NULL_TREE, 5263 build_selector (METHOD_SEL_NAME (entries)), 5264 NULL_TREE); 5265 5266 /* Generate the method encoding if we don't have one already. */ 5267 if (! METHOD_ENCODING (entries)) 5268 METHOD_ENCODING (entries) = 5269 encode_method_prototype (entries); 5270 5271 elemlist = tree_cons (NULL_TREE, 5272 add_objc_string (METHOD_ENCODING (entries), 5273 meth_var_types), 5274 elemlist); 5275 5276 elemlist 5277 = tree_cons (NULL_TREE, 5278 convert (ptr_type_node, 5279 build_unary_op (ADDR_EXPR, 5280 METHOD_DEFINITION (entries), 1)), 5281 elemlist); 5282 5283 initlist = tree_cons (NULL_TREE, 5284 objc_build_constructor (type, nreverse (elemlist)), 5285 initlist); 5286 5287 entries = TREE_CHAIN (entries); 5288 } 5289 while (entries); 5290 5291 return objc_build_constructor (build_array_type (type, 0), 5292 nreverse (initlist)); 5293} 5294 5295/* To accomplish method prototyping without generating all kinds of 5296 inane warnings, the definition of the dispatch table entries were 5297 changed from: 5298 5299 struct objc_method { SEL _cmd; ...; id (*_imp)(); }; 5300 to: 5301 struct objc_method { SEL _cmd; ...; void *_imp; }; */ 5302 5303static tree 5304build_method_template (void) 5305{ 5306 tree _SLT_record; 5307 tree field_decl, field_decl_chain; 5308 5309 _SLT_record = start_struct (RECORD_TYPE, get_identifier (UTAG_METHOD)); 5310 5311 /* SEL _cmd; */ 5312 field_decl = create_field_decl (objc_selector_type, "_cmd"); 5313 field_decl_chain = field_decl; 5314 5315 /* char *method_types; */ 5316 field_decl = create_field_decl (string_type_node, "method_types"); 5317 chainon (field_decl_chain, field_decl); 5318 5319 /* void *_imp; */ 5320 field_decl = create_field_decl (build_pointer_type (void_type_node), 5321 "_imp"); 5322 chainon (field_decl_chain, field_decl); 5323 5324 finish_struct (_SLT_record, field_decl_chain, NULL_TREE); 5325 5326 return _SLT_record; 5327} 5328 5329 5330static tree 5331generate_dispatch_table (tree type, const char *name, int size, tree list) 5332{ 5333 tree decl, initlist; 5334 5335 decl = start_var_decl (type, synth_id_with_class_suffix 5336 (name, objc_implementation_context)); 5337 5338 initlist = build_tree_list (NULL_TREE, build_int_cst (NULL_TREE, 0)); 5339 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, size), initlist); 5340 initlist = tree_cons (NULL_TREE, list, initlist); 5341 5342 finish_var_decl (decl, 5343 objc_build_constructor (TREE_TYPE (decl), 5344 nreverse (initlist))); 5345 5346 return decl; 5347} 5348 5349static void 5350mark_referenced_methods (void) 5351{ 5352 struct imp_entry *impent; 5353 tree chain; 5354 5355 for (impent = imp_list; impent; impent = impent->next) 5356 { 5357 chain = CLASS_CLS_METHODS (impent->imp_context); 5358 while (chain) 5359 { 5360 cgraph_mark_needed_node (cgraph_node (METHOD_DEFINITION (chain))); 5361 chain = TREE_CHAIN (chain); 5362 } 5363 5364 chain = CLASS_NST_METHODS (impent->imp_context); 5365 while (chain) 5366 { 5367 cgraph_mark_needed_node (cgraph_node (METHOD_DEFINITION (chain))); 5368 chain = TREE_CHAIN (chain); 5369 } 5370 } 5371} 5372 5373static void 5374generate_dispatch_tables (void) 5375{ 5376 tree initlist, chain, method_list_template; 5377 int size; 5378 5379 if (!objc_method_template) 5380 objc_method_template = build_method_template (); 5381 5382 chain = CLASS_CLS_METHODS (objc_implementation_context); 5383 if (chain) 5384 { 5385 size = list_length (chain); 5386 5387 method_list_template 5388 = build_method_list_template (objc_method_template, size); 5389 initlist 5390 = build_dispatch_table_initializer (objc_method_template, chain); 5391 5392 UOBJC_CLASS_METHODS_decl 5393 = generate_dispatch_table (method_list_template, 5394 ((TREE_CODE (objc_implementation_context) 5395 == CLASS_IMPLEMENTATION_TYPE) 5396 ? "_OBJC_CLASS_METHODS" 5397 : "_OBJC_CATEGORY_CLASS_METHODS"), 5398 size, initlist); 5399 } 5400 else 5401 UOBJC_CLASS_METHODS_decl = 0; 5402 5403 chain = CLASS_NST_METHODS (objc_implementation_context); 5404 if (chain) 5405 { 5406 size = list_length (chain); 5407 5408 method_list_template 5409 = build_method_list_template (objc_method_template, size); 5410 initlist 5411 = build_dispatch_table_initializer (objc_method_template, chain); 5412 5413 if (TREE_CODE (objc_implementation_context) == CLASS_IMPLEMENTATION_TYPE) 5414 UOBJC_INSTANCE_METHODS_decl 5415 = generate_dispatch_table (method_list_template, 5416 "_OBJC_INSTANCE_METHODS", 5417 size, initlist); 5418 else 5419 /* We have a category. */ 5420 UOBJC_INSTANCE_METHODS_decl 5421 = generate_dispatch_table (method_list_template, 5422 "_OBJC_CATEGORY_INSTANCE_METHODS", 5423 size, initlist); 5424 } 5425 else 5426 UOBJC_INSTANCE_METHODS_decl = 0; 5427} 5428 5429static tree 5430generate_protocol_list (tree i_or_p) 5431{ 5432 tree initlist; 5433 tree refs_decl, lproto, e, plist; 5434 int size = 0; 5435 const char *ref_name; 5436 5437 if (TREE_CODE (i_or_p) == CLASS_INTERFACE_TYPE 5438 || TREE_CODE (i_or_p) == CATEGORY_INTERFACE_TYPE) 5439 plist = CLASS_PROTOCOL_LIST (i_or_p); 5440 else if (TREE_CODE (i_or_p) == PROTOCOL_INTERFACE_TYPE) 5441 plist = PROTOCOL_LIST (i_or_p); 5442 else 5443 abort (); 5444 5445 /* Compute size. */ 5446 for (lproto = plist; lproto; lproto = TREE_CHAIN (lproto)) 5447 if (TREE_CODE (TREE_VALUE (lproto)) == PROTOCOL_INTERFACE_TYPE 5448 && PROTOCOL_FORWARD_DECL (TREE_VALUE (lproto))) 5449 size++; 5450 5451 /* Build initializer. */ 5452 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), NULL_TREE); 5453 e = build_int_cst (build_pointer_type (objc_protocol_template), size); 5454 initlist = tree_cons (NULL_TREE, e, initlist); 5455 5456 for (lproto = plist; lproto; lproto = TREE_CHAIN (lproto)) 5457 { 5458 tree pval = TREE_VALUE (lproto); 5459 5460 if (TREE_CODE (pval) == PROTOCOL_INTERFACE_TYPE 5461 && PROTOCOL_FORWARD_DECL (pval)) 5462 { 5463 e = build_unary_op (ADDR_EXPR, PROTOCOL_FORWARD_DECL (pval), 0); 5464 initlist = tree_cons (NULL_TREE, e, initlist); 5465 } 5466 } 5467 5468 /* static struct objc_protocol *refs[n]; */ 5469 5470 if (TREE_CODE (i_or_p) == PROTOCOL_INTERFACE_TYPE) 5471 ref_name = synth_id_with_class_suffix ("_OBJC_PROTOCOL_REFS", i_or_p); 5472 else if (TREE_CODE (i_or_p) == CLASS_INTERFACE_TYPE) 5473 ref_name = synth_id_with_class_suffix ("_OBJC_CLASS_PROTOCOLS", i_or_p); 5474 else if (TREE_CODE (i_or_p) == CATEGORY_INTERFACE_TYPE) 5475 ref_name = synth_id_with_class_suffix ("_OBJC_CATEGORY_PROTOCOLS", i_or_p); 5476 else 5477 abort (); 5478 5479 refs_decl = start_var_decl 5480 (build_array_type 5481 (build_pointer_type (objc_protocol_template), 5482 build_index_type (build_int_cst (NULL_TREE, size + 2))), 5483 ref_name); 5484 5485 finish_var_decl (refs_decl, objc_build_constructor (TREE_TYPE (refs_decl), 5486 nreverse (initlist))); 5487 5488 return refs_decl; 5489} 5490 5491static tree 5492build_category_initializer (tree type, tree cat_name, tree class_name, 5493 tree instance_methods, tree class_methods, 5494 tree protocol_list) 5495{ 5496 tree initlist = NULL_TREE, expr; 5497 5498 initlist = tree_cons (NULL_TREE, cat_name, initlist); 5499 initlist = tree_cons (NULL_TREE, class_name, initlist); 5500 5501 if (!instance_methods) 5502 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5503 else 5504 { 5505 expr = convert (objc_method_list_ptr, 5506 build_unary_op (ADDR_EXPR, instance_methods, 0)); 5507 initlist = tree_cons (NULL_TREE, expr, initlist); 5508 } 5509 if (!class_methods) 5510 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5511 else 5512 { 5513 expr = convert (objc_method_list_ptr, 5514 build_unary_op (ADDR_EXPR, class_methods, 0)); 5515 initlist = tree_cons (NULL_TREE, expr, initlist); 5516 } 5517 5518 /* protocol_list = */ 5519 if (!protocol_list) 5520 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5521 else 5522 { 5523 expr = convert (build_pointer_type 5524 (build_pointer_type 5525 (objc_protocol_template)), 5526 build_unary_op (ADDR_EXPR, protocol_list, 0)); 5527 initlist = tree_cons (NULL_TREE, expr, initlist); 5528 } 5529 5530 return objc_build_constructor (type, nreverse (initlist)); 5531} 5532 5533/* struct _objc_class { 5534 struct objc_class *isa; 5535 struct objc_class *super_class; 5536 char *name; 5537 long version; 5538 long info; 5539 long instance_size; 5540 struct objc_ivar_list *ivars; 5541 struct objc_method_list *methods; 5542 if (flag_next_runtime) 5543 struct objc_cache *cache; 5544 else { 5545 struct sarray *dtable; 5546 struct objc_class *subclass_list; 5547 struct objc_class *sibling_class; 5548 } 5549 struct objc_protocol_list *protocols; 5550 if (flag_next_runtime) 5551 void *sel_id; 5552 void *gc_object_type; 5553 }; */ 5554 5555static tree 5556build_shared_structure_initializer (tree type, tree isa, tree super, 5557 tree name, tree size, int status, 5558 tree dispatch_table, tree ivar_list, 5559 tree protocol_list) 5560{ 5561 tree initlist = NULL_TREE, expr; 5562 5563 /* isa = */ 5564 initlist = tree_cons (NULL_TREE, isa, initlist); 5565 5566 /* super_class = */ 5567 initlist = tree_cons (NULL_TREE, super, initlist); 5568 5569 /* name = */ 5570 initlist = tree_cons (NULL_TREE, default_conversion (name), initlist); 5571 5572 /* version = */ 5573 initlist = tree_cons (NULL_TREE, build_int_cst (long_integer_type_node, 0), 5574 initlist); 5575 5576 /* info = */ 5577 initlist = tree_cons (NULL_TREE, 5578 build_int_cst (long_integer_type_node, status), 5579 initlist); 5580 5581 /* instance_size = */ 5582 initlist = tree_cons (NULL_TREE, convert (long_integer_type_node, size), 5583 initlist); 5584 5585 /* objc_ivar_list = */ 5586 if (!ivar_list) 5587 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5588 else 5589 { 5590 expr = convert (objc_ivar_list_ptr, 5591 build_unary_op (ADDR_EXPR, ivar_list, 0)); 5592 initlist = tree_cons (NULL_TREE, expr, initlist); 5593 } 5594 5595 /* objc_method_list = */ 5596 if (!dispatch_table) 5597 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5598 else 5599 { 5600 expr = convert (objc_method_list_ptr, 5601 build_unary_op (ADDR_EXPR, dispatch_table, 0)); 5602 initlist = tree_cons (NULL_TREE, expr, initlist); 5603 } 5604 5605 if (flag_next_runtime) 5606 /* method_cache = */ 5607 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5608 else 5609 { 5610 /* dtable = */ 5611 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5612 5613 /* subclass_list = */ 5614 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5615 5616 /* sibling_class = */ 5617 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5618 } 5619 5620 /* protocol_list = */ 5621 if (! protocol_list) 5622 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5623 else 5624 { 5625 expr = convert (build_pointer_type 5626 (build_pointer_type 5627 (objc_protocol_template)), 5628 build_unary_op (ADDR_EXPR, protocol_list, 0)); 5629 initlist = tree_cons (NULL_TREE, expr, initlist); 5630 } 5631 5632 if (flag_next_runtime) 5633 /* sel_id = NULL */ 5634 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5635 5636 /* gc_object_type = NULL */ 5637 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist); 5638 5639 return objc_build_constructor (type, nreverse (initlist)); 5640} 5641 5642/* Retrieve category interface CAT_NAME (if any) associated with CLASS. */ 5643 5644static inline tree 5645lookup_category (tree class, tree cat_name) 5646{ 5647 tree category = CLASS_CATEGORY_LIST (class); 5648 5649 while (category && CLASS_SUPER_NAME (category) != cat_name) 5650 category = CLASS_CATEGORY_LIST (category); 5651 return category; 5652} 5653 5654/* static struct objc_category _OBJC_CATEGORY_<name> = { ... }; */ 5655 5656static void 5657generate_category (tree cat) 5658{ 5659 tree decl; 5660 tree initlist, cat_name_expr, class_name_expr; 5661 tree protocol_decl, category; 5662 5663 add_class_reference (CLASS_NAME (cat)); 5664 cat_name_expr = add_objc_string (CLASS_SUPER_NAME (cat), class_names); 5665 5666 class_name_expr = add_objc_string (CLASS_NAME (cat), class_names); 5667 5668 category = lookup_category (implementation_template, 5669 CLASS_SUPER_NAME (cat)); 5670 5671 if (category && CLASS_PROTOCOL_LIST (category)) 5672 { 5673 generate_protocol_references (CLASS_PROTOCOL_LIST (category)); 5674 protocol_decl = generate_protocol_list (category); 5675 } 5676 else 5677 protocol_decl = 0; 5678 5679 decl = start_var_decl (objc_category_template, 5680 synth_id_with_class_suffix 5681 ("_OBJC_CATEGORY", objc_implementation_context)); 5682 5683 initlist = build_category_initializer (TREE_TYPE (decl), 5684 cat_name_expr, class_name_expr, 5685 UOBJC_INSTANCE_METHODS_decl, 5686 UOBJC_CLASS_METHODS_decl, 5687 protocol_decl); 5688 5689 finish_var_decl (decl, initlist); 5690} 5691 5692/* static struct objc_class _OBJC_METACLASS_Foo={ ... }; 5693 static struct objc_class _OBJC_CLASS_Foo={ ... }; */ 5694 5695static void 5696generate_shared_structures (int cls_flags) 5697{ 5698 tree sc_spec, decl_specs, decl; 5699 tree name_expr, super_expr, root_expr; 5700 tree my_root_id = NULL_TREE, my_super_id = NULL_TREE; 5701 tree cast_type, initlist, protocol_decl; 5702 5703 my_super_id = CLASS_SUPER_NAME (implementation_template); 5704 if (my_super_id) 5705 { 5706 add_class_reference (my_super_id); 5707 5708 /* Compute "my_root_id" - this is required for code generation. 5709 the "isa" for all meta class structures points to the root of 5710 the inheritance hierarchy (e.g. "__Object")... */ 5711 my_root_id = my_super_id; 5712 do 5713 { 5714 tree my_root_int = lookup_interface (my_root_id); 5715 5716 if (my_root_int && CLASS_SUPER_NAME (my_root_int)) 5717 my_root_id = CLASS_SUPER_NAME (my_root_int); 5718 else 5719 break; 5720 } 5721 while (1); 5722 } 5723 else 5724 /* No super class. */ 5725 my_root_id = CLASS_NAME (implementation_template); 5726 5727 cast_type = build_pointer_type (objc_class_template); 5728 name_expr = add_objc_string (CLASS_NAME (implementation_template), 5729 class_names); 5730 5731 /* Install class `isa' and `super' pointers at runtime. */ 5732 if (my_super_id) 5733 { 5734 super_expr = add_objc_string (my_super_id, class_names); 5735 super_expr = build_c_cast (cast_type, super_expr); /* cast! */ 5736 } 5737 else 5738 super_expr = build_int_cst (NULL_TREE, 0); 5739 5740 root_expr = add_objc_string (my_root_id, class_names); 5741 root_expr = build_c_cast (cast_type, root_expr); /* cast! */ 5742 5743 if (CLASS_PROTOCOL_LIST (implementation_template)) 5744 { 5745 generate_protocol_references 5746 (CLASS_PROTOCOL_LIST (implementation_template)); 5747 protocol_decl = generate_protocol_list (implementation_template); 5748 } 5749 else 5750 protocol_decl = 0; 5751 5752 /* static struct objc_class _OBJC_METACLASS_Foo = { ... }; */ 5753 5754 sc_spec = build_tree_list (NULL_TREE, ridpointers[(int) RID_STATIC]); 5755 decl_specs = tree_cons (NULL_TREE, objc_class_template, sc_spec); 5756 5757 decl = start_var_decl (objc_class_template, 5758 IDENTIFIER_POINTER 5759 (DECL_NAME (UOBJC_METACLASS_decl))); 5760 5761 initlist 5762 = build_shared_structure_initializer 5763 (TREE_TYPE (decl), 5764 root_expr, super_expr, name_expr, 5765 convert (integer_type_node, TYPE_SIZE_UNIT (objc_class_template)), 5766 2 /*CLS_META*/, 5767 UOBJC_CLASS_METHODS_decl, 5768 UOBJC_CLASS_VARIABLES_decl, 5769 protocol_decl); 5770 5771 finish_var_decl (decl, initlist); 5772 5773 /* static struct objc_class _OBJC_CLASS_Foo={ ... }; */ 5774 5775 decl = start_var_decl (objc_class_template, 5776 IDENTIFIER_POINTER 5777 (DECL_NAME (UOBJC_CLASS_decl))); 5778 5779 initlist 5780 = build_shared_structure_initializer 5781 (TREE_TYPE (decl), 5782 build_unary_op (ADDR_EXPR, UOBJC_METACLASS_decl, 0), 5783 super_expr, name_expr, 5784 convert (integer_type_node, 5785 TYPE_SIZE_UNIT (CLASS_STATIC_TEMPLATE 5786 (implementation_template))), 5787 1 /*CLS_FACTORY*/ | cls_flags, 5788 UOBJC_INSTANCE_METHODS_decl, 5789 UOBJC_INSTANCE_VARIABLES_decl, 5790 protocol_decl); 5791 5792 finish_var_decl (decl, initlist); 5793} 5794 5795 5796static const char * 5797synth_id_with_class_suffix (const char *preamble, tree ctxt) 5798{ 5799 static char string[BUFSIZE]; 5800 5801 if (TREE_CODE (ctxt) == CLASS_IMPLEMENTATION_TYPE 5802 || TREE_CODE (ctxt) == CLASS_INTERFACE_TYPE) 5803 { 5804 sprintf (string, "%s_%s", preamble, 5805 IDENTIFIER_POINTER (CLASS_NAME (ctxt))); 5806 } 5807 else if (TREE_CODE (ctxt) == CATEGORY_IMPLEMENTATION_TYPE 5808 || TREE_CODE (ctxt) == CATEGORY_INTERFACE_TYPE) 5809 { 5810 /* We have a category. */ 5811 const char *const class_name 5812 = IDENTIFIER_POINTER (CLASS_NAME (objc_implementation_context)); 5813 const char *const class_super_name 5814 = IDENTIFIER_POINTER (CLASS_SUPER_NAME (objc_implementation_context)); 5815 sprintf (string, "%s_%s_%s", preamble, class_name, class_super_name); 5816 } 5817 else if (TREE_CODE (ctxt) == PROTOCOL_INTERFACE_TYPE) 5818 { 5819 const char *protocol_name = IDENTIFIER_POINTER (PROTOCOL_NAME (ctxt)); 5820 sprintf (string, "%s_%s", preamble, protocol_name); 5821 } 5822 else 5823 abort (); 5824 5825 return string; 5826} 5827 5828/* If type is empty or only type qualifiers are present, add default 5829 type of id (otherwise grokdeclarator will default to int). */ 5830 5831static tree 5832adjust_type_for_id_default (tree type) 5833{ 5834 if (!type) 5835 type = make_node (TREE_LIST); 5836 5837 if (!TREE_VALUE (type)) 5838 TREE_VALUE (type) = objc_object_type; 5839 else if (TREE_CODE (TREE_VALUE (type)) == RECORD_TYPE 5840 && TYPED_OBJECT (TREE_VALUE (type))) 5841 error ("can not use an object as parameter to a method"); 5842 5843 return type; 5844} 5845 5846/* Usage: 5847 keyworddecl: 5848 selector ':' '(' typename ')' identifier 5849 5850 Purpose: 5851 Transform an Objective-C keyword argument into 5852 the C equivalent parameter declarator. 5853 5854 In: key_name, an "identifier_node" (optional). 5855 arg_type, a "tree_list" (optional). 5856 arg_name, an "identifier_node". 5857 5858 Note: It would be really nice to strongly type the preceding 5859 arguments in the function prototype; however, then I 5860 could not use the "accessor" macros defined in "tree.h". 5861 5862 Out: an instance of "keyword_decl". */ 5863 5864tree 5865objc_build_keyword_decl (tree key_name, tree arg_type, tree arg_name) 5866{ 5867 tree keyword_decl; 5868 5869 /* If no type is specified, default to "id". */ 5870 arg_type = adjust_type_for_id_default (arg_type); 5871 5872 keyword_decl = make_node (KEYWORD_DECL); 5873 5874 TREE_TYPE (keyword_decl) = arg_type; 5875 KEYWORD_ARG_NAME (keyword_decl) = arg_name; 5876 KEYWORD_KEY_NAME (keyword_decl) = key_name; 5877 5878 return keyword_decl; 5879} 5880 5881/* Given a chain of keyword_decl's, synthesize the full keyword selector. */ 5882 5883static tree 5884build_keyword_selector (tree selector) 5885{ 5886 int len = 0; 5887 tree key_chain, key_name; 5888 char *buf; 5889 5890 /* Scan the selector to see how much space we'll need. */ 5891 for (key_chain = selector; key_chain; key_chain = TREE_CHAIN (key_chain)) 5892 { 5893 if (TREE_CODE (selector) == KEYWORD_DECL) 5894 key_name = KEYWORD_KEY_NAME (key_chain); 5895 else if (TREE_CODE (selector) == TREE_LIST) 5896 key_name = TREE_PURPOSE (key_chain); 5897 else 5898 abort (); 5899 5900 if (key_name) 5901 len += IDENTIFIER_LENGTH (key_name) + 1; 5902 else 5903 /* Just a ':' arg. */ 5904 len++; 5905 } 5906 5907 buf = (char *) alloca (len + 1); 5908 /* Start the buffer out as an empty string. */ 5909 buf[0] = '\0'; 5910 5911 for (key_chain = selector; key_chain; key_chain = TREE_CHAIN (key_chain)) 5912 { 5913 if (TREE_CODE (selector) == KEYWORD_DECL) 5914 key_name = KEYWORD_KEY_NAME (key_chain); 5915 else if (TREE_CODE (selector) == TREE_LIST) 5916 { 5917 key_name = TREE_PURPOSE (key_chain); 5918 /* The keyword decl chain will later be used as a function argument 5919 chain. Unhook the selector itself so as to not confuse other 5920 parts of the compiler. */ 5921 TREE_PURPOSE (key_chain) = NULL_TREE; 5922 } 5923 else 5924 abort (); 5925 5926 if (key_name) 5927 strcat (buf, IDENTIFIER_POINTER (key_name)); 5928 strcat (buf, ":"); 5929 } 5930 5931 return get_identifier (buf); 5932} 5933 5934/* Used for declarations and definitions. */ 5935 5936static tree 5937build_method_decl (enum tree_code code, tree ret_type, tree selector, 5938 tree add_args, bool ellipsis) 5939{ 5940 tree method_decl; 5941 5942 /* If no type is specified, default to "id". */ 5943 ret_type = adjust_type_for_id_default (ret_type); 5944 5945 method_decl = make_node (code); 5946 TREE_TYPE (method_decl) = ret_type; 5947 5948 /* If we have a keyword selector, create an identifier_node that 5949 represents the full selector name (`:' included)... */ 5950 if (TREE_CODE (selector) == KEYWORD_DECL) 5951 { 5952 METHOD_SEL_NAME (method_decl) = build_keyword_selector (selector); 5953 METHOD_SEL_ARGS (method_decl) = selector; 5954 METHOD_ADD_ARGS (method_decl) = add_args; 5955 METHOD_ADD_ARGS_ELLIPSIS_P (method_decl) = ellipsis; 5956 } 5957 else 5958 { 5959 METHOD_SEL_NAME (method_decl) = selector; 5960 METHOD_SEL_ARGS (method_decl) = NULL_TREE; 5961 METHOD_ADD_ARGS (method_decl) = NULL_TREE; 5962 } 5963 5964 return method_decl; 5965} 5966 5967#define METHOD_DEF 0 5968#define METHOD_REF 1 5969 5970/* Used by `build_objc_method_call' and `comp_proto_with_proto'. Return 5971 an argument list for method METH. CONTEXT is either METHOD_DEF or 5972 METHOD_REF, saying whether we are trying to define a method or call 5973 one. SUPERFLAG says this is for a send to super; this makes a 5974 difference for the NeXT calling sequence in which the lookup and 5975 the method call are done together. If METH is null, user-defined 5976 arguments (i.e., beyond self and _cmd) shall be represented by `...'. */ 5977 5978static tree 5979get_arg_type_list (tree meth, int context, int superflag) 5980{ 5981 tree arglist, akey; 5982 5983 /* Receiver type. */ 5984 if (flag_next_runtime && superflag) 5985 arglist = build_tree_list (NULL_TREE, objc_super_type); 5986 else if (context == METHOD_DEF && TREE_CODE (meth) == INSTANCE_METHOD_DECL) 5987 arglist = build_tree_list (NULL_TREE, objc_instance_type); 5988 else 5989 arglist = build_tree_list (NULL_TREE, objc_object_type); 5990 5991 /* Selector type - will eventually change to `int'. */ 5992 chainon (arglist, build_tree_list (NULL_TREE, objc_selector_type)); 5993 5994 /* No actual method prototype given -- assume that remaining arguments 5995 are `...'. */ 5996 if (!meth) 5997 return arglist; 5998 5999 /* Build a list of argument types. */ 6000 for (akey = METHOD_SEL_ARGS (meth); akey; akey = TREE_CHAIN (akey)) 6001 { 6002 tree arg_type = TREE_VALUE (TREE_TYPE (akey)); 6003 6004 /* Decay arrays and functions into pointers. */ 6005 if (TREE_CODE (arg_type) == ARRAY_TYPE) 6006 arg_type = build_pointer_type (TREE_TYPE (arg_type)); 6007 else if (TREE_CODE (arg_type) == FUNCTION_TYPE) 6008 arg_type = build_pointer_type (arg_type); 6009 6010 chainon (arglist, build_tree_list (NULL_TREE, arg_type)); 6011 } 6012 6013 if (METHOD_ADD_ARGS (meth)) 6014 { 6015 for (akey = TREE_CHAIN (METHOD_ADD_ARGS (meth)); 6016 akey; akey = TREE_CHAIN (akey)) 6017 { 6018 tree arg_type = TREE_TYPE (TREE_VALUE (akey)); 6019 6020 chainon (arglist, build_tree_list (NULL_TREE, arg_type)); 6021 } 6022 6023 if (!METHOD_ADD_ARGS_ELLIPSIS_P (meth)) 6024 goto lack_of_ellipsis; 6025 } 6026 else 6027 { 6028 lack_of_ellipsis: 6029 chainon (arglist, OBJC_VOID_AT_END); 6030 } 6031 6032 return arglist; 6033} 6034 6035static tree 6036check_duplicates (hash hsh, int methods, int is_class) 6037{ 6038 tree meth = NULL_TREE; 6039 6040 if (hsh) 6041 { 6042 meth = hsh->key; 6043 6044 if (hsh->list) 6045 { 6046 /* We have two or more methods with the same name but 6047 different types. */ 6048 attr loop; 6049 6050 /* But just how different are those types? If 6051 -Wno-strict-selector-match is specified, we shall not 6052 complain if the differences are solely among types with 6053 identical size and alignment. */ 6054 if (!warn_strict_selector_match) 6055 { 6056 for (loop = hsh->list; loop; loop = loop->next) 6057 if (!comp_proto_with_proto (meth, loop->value, 0)) 6058 goto issue_warning; 6059 6060 return meth; 6061 } 6062 6063 issue_warning: 6064 warning (0, "multiple %s named %<%c%s%> found", 6065 methods ? "methods" : "selectors", 6066 (is_class ? '+' : '-'), 6067 IDENTIFIER_POINTER (METHOD_SEL_NAME (meth))); 6068 6069 warn_with_method (methods ? "using" : "found", 6070 ((TREE_CODE (meth) == INSTANCE_METHOD_DECL) 6071 ? '-' 6072 : '+'), 6073 meth); 6074 for (loop = hsh->list; loop; loop = loop->next) 6075 warn_with_method ("also found", 6076 ((TREE_CODE (loop->value) == INSTANCE_METHOD_DECL) 6077 ? '-' 6078 : '+'), 6079 loop->value); 6080 } 6081 } 6082 return meth; 6083} 6084 6085/* If RECEIVER is a class reference, return the identifier node for 6086 the referenced class. RECEIVER is created by objc_get_class_reference, 6087 so we check the exact form created depending on which runtimes are 6088 used. */ 6089 6090static tree 6091receiver_is_class_object (tree receiver, int self, int super) 6092{ 6093 tree chain, exp, arg; 6094 6095 /* The receiver is 'self' or 'super' in the context of a class method. */ 6096 if (objc_method_context 6097 && TREE_CODE (objc_method_context) == CLASS_METHOD_DECL 6098 && (self || super)) 6099 return (super 6100 ? CLASS_SUPER_NAME (implementation_template) 6101 : CLASS_NAME (implementation_template)); 6102 6103 if (flag_next_runtime) 6104 { 6105 /* The receiver is a variable created by 6106 build_class_reference_decl. */ 6107 if (TREE_CODE (receiver) == VAR_DECL && IS_CLASS (TREE_TYPE (receiver))) 6108 /* Look up the identifier. */ 6109 for (chain = cls_ref_chain; chain; chain = TREE_CHAIN (chain)) 6110 if (TREE_PURPOSE (chain) == receiver) 6111 return TREE_VALUE (chain); 6112 } 6113 6114 /* The receiver is a function call that returns an id. Check if 6115 it is a call to objc_getClass, if so, pick up the class name. */ 6116 if (TREE_CODE (receiver) == CALL_EXPR 6117 && (exp = TREE_OPERAND (receiver, 0)) 6118 && TREE_CODE (exp) == ADDR_EXPR 6119 && (exp = TREE_OPERAND (exp, 0)) 6120 && TREE_CODE (exp) == FUNCTION_DECL 6121 /* For some reason, we sometimes wind up with multiple FUNCTION_DECL 6122 prototypes for objc_get_class(). Thankfully, they seem to share the 6123 same function type. */ 6124 && TREE_TYPE (exp) == TREE_TYPE (objc_get_class_decl) 6125 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (exp)), TAG_GETCLASS) 6126 /* We have a call to objc_get_class/objc_getClass! */ 6127 && (arg = TREE_OPERAND (receiver, 1)) 6128 && TREE_CODE (arg) == TREE_LIST 6129 && (arg = TREE_VALUE (arg))) 6130 { 6131 STRIP_NOPS (arg); 6132 if (TREE_CODE (arg) == ADDR_EXPR 6133 && (arg = TREE_OPERAND (arg, 0)) 6134 && TREE_CODE (arg) == STRING_CST) 6135 /* Finally, we have the class name. */ 6136 return get_identifier (TREE_STRING_POINTER (arg)); 6137 } 6138 return 0; 6139} 6140 6141/* If we are currently building a message expr, this holds 6142 the identifier of the selector of the message. This is 6143 used when printing warnings about argument mismatches. */ 6144 6145static tree current_objc_message_selector = 0; 6146 6147tree 6148objc_message_selector (void) 6149{ 6150 return current_objc_message_selector; 6151} 6152 6153/* Construct an expression for sending a message. 6154 MESS has the object to send to in TREE_PURPOSE 6155 and the argument list (including selector) in TREE_VALUE. 6156 6157 (*(<abstract_decl>(*)())_msg)(receiver, selTransTbl[n], ...); 6158 (*(<abstract_decl>(*)())_msgSuper)(receiver, selTransTbl[n], ...); */ 6159 6160tree 6161objc_build_message_expr (tree mess) 6162{ 6163 tree receiver = TREE_PURPOSE (mess); 6164 tree sel_name; 6165#ifdef OBJCPLUS 6166 tree args = TREE_PURPOSE (TREE_VALUE (mess)); 6167#else 6168 tree args = TREE_VALUE (mess); 6169#endif 6170 tree method_params = NULL_TREE; 6171 6172 if (TREE_CODE (receiver) == ERROR_MARK) 6173 return error_mark_node; 6174 6175 /* Obtain the full selector name. */ 6176 if (TREE_CODE (args) == IDENTIFIER_NODE) 6177 /* A unary selector. */ 6178 sel_name = args; 6179 else if (TREE_CODE (args) == TREE_LIST) 6180 sel_name = build_keyword_selector (args); 6181 else 6182 abort (); 6183 6184 /* Build the parameter list to give to the method. */ 6185 if (TREE_CODE (args) == TREE_LIST) 6186#ifdef OBJCPLUS 6187 method_params = chainon (args, TREE_VALUE (TREE_VALUE (mess))); 6188#else 6189 { 6190 tree chain = args, prev = NULL_TREE; 6191 6192 /* We have a keyword selector--check for comma expressions. */ 6193 while (chain) 6194 { 6195 tree element = TREE_VALUE (chain); 6196 6197 /* We have a comma expression, must collapse... */ 6198 if (TREE_CODE (element) == TREE_LIST) 6199 { 6200 if (prev) 6201 TREE_CHAIN (prev) = element; 6202 else 6203 args = element; 6204 } 6205 prev = chain; 6206 chain = TREE_CHAIN (chain); 6207 } 6208 method_params = args; 6209 } 6210#endif 6211 6212#ifdef OBJCPLUS 6213 if (processing_template_decl) 6214 /* Must wait until template instantiation time. */ 6215 return build_min_nt (MESSAGE_SEND_EXPR, receiver, sel_name, 6216 method_params); 6217#endif 6218 6219 return objc_finish_message_expr (receiver, sel_name, method_params); 6220} 6221 6222/* Look up method SEL_NAME that would be suitable for receiver 6223 of type 'id' (if IS_CLASS is zero) or 'Class' (if IS_CLASS is 6224 nonzero), and report on any duplicates. */ 6225 6226static tree 6227lookup_method_in_hash_lists (tree sel_name, int is_class) 6228{ 6229 hash method_prototype = NULL; 6230 6231 if (!is_class) 6232 method_prototype = hash_lookup (nst_method_hash_list, 6233 sel_name); 6234 6235 if (!method_prototype) 6236 { 6237 method_prototype = hash_lookup (cls_method_hash_list, 6238 sel_name); 6239 is_class = 1; 6240 } 6241 6242 return check_duplicates (method_prototype, 1, is_class); 6243} 6244 6245/* The 'objc_finish_message_expr' routine is called from within 6246 'objc_build_message_expr' for non-template functions. In the case of 6247 C++ template functions, it is called from 'build_expr_from_tree' 6248 (in decl2.c) after RECEIVER and METHOD_PARAMS have been expanded. */ 6249 6250tree 6251objc_finish_message_expr (tree receiver, tree sel_name, tree method_params) 6252{ 6253 tree method_prototype = NULL_TREE, rprotos = NULL_TREE, rtype; 6254 tree selector, retval, class_tree; 6255 int self, super, have_cast; 6256 6257 /* Extract the receiver of the message, as well as its type 6258 (where the latter may take the form of a cast or be inferred 6259 from the implementation context). */ 6260 rtype = receiver; 6261 while (TREE_CODE (rtype) == COMPOUND_EXPR 6262 || TREE_CODE (rtype) == MODIFY_EXPR 6263 || TREE_CODE (rtype) == NOP_EXPR 6264 || TREE_CODE (rtype) == CONVERT_EXPR 6265 || TREE_CODE (rtype) == COMPONENT_REF) 6266 rtype = TREE_OPERAND (rtype, 0); 6267 self = (rtype == self_decl); 6268 super = (rtype == UOBJC_SUPER_decl); 6269 rtype = TREE_TYPE (receiver); 6270 have_cast = (TREE_CODE (receiver) == NOP_EXPR 6271 || (TREE_CODE (receiver) == COMPOUND_EXPR 6272 && !IS_SUPER (rtype))); 6273 6274 /* If we are calling [super dealloc], reset our warning flag. */ 6275 if (super && !strcmp ("dealloc", IDENTIFIER_POINTER (sel_name))) 6276 should_call_super_dealloc = 0; 6277 6278 /* If the receiver is a class object, retrieve the corresponding 6279 @interface, if one exists. */ 6280 class_tree = receiver_is_class_object (receiver, self, super); 6281 6282 /* Now determine the receiver type (if an explicit cast has not been 6283 provided). */ 6284 if (!have_cast) 6285 { 6286 if (class_tree) 6287 rtype = lookup_interface (class_tree); 6288 /* Handle `self' and `super'. */ 6289 else if (super) 6290 { 6291 if (!CLASS_SUPER_NAME (implementation_template)) 6292 { 6293 error ("no super class declared in @interface for %qs", 6294 IDENTIFIER_POINTER (CLASS_NAME (implementation_template))); 6295 return error_mark_node; 6296 } 6297 rtype = lookup_interface (CLASS_SUPER_NAME (implementation_template)); 6298 } 6299 else if (self) 6300 rtype = lookup_interface (CLASS_NAME (implementation_template)); 6301 } 6302 6303 /* If receiver is of type `id' or `Class' (or if the @interface for a 6304 class is not visible), we shall be satisfied with the existence of 6305 any instance or class method. */ 6306 if (objc_is_id (rtype)) 6307 { 6308 class_tree = (IS_CLASS (rtype) ? objc_class_name : NULL_TREE); 6309 rprotos = (TYPE_HAS_OBJC_INFO (TREE_TYPE (rtype)) 6310 ? TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (rtype)) 6311 : NULL_TREE); 6312 rtype = NULL_TREE; 6313 6314 if (rprotos) 6315 { 6316 /* If messaging 'id <Protos>' or 'Class <Proto>', first search 6317 in protocols themselves for the method prototype. */ 6318 method_prototype 6319 = lookup_method_in_protocol_list (rprotos, sel_name, 6320 class_tree != NULL_TREE); 6321 6322 /* If messaging 'Class <Proto>' but did not find a class method 6323 prototype, search for an instance method instead, and warn 6324 about having done so. */ 6325 if (!method_prototype && !rtype && class_tree != NULL_TREE) 6326 { 6327 method_prototype 6328 = lookup_method_in_protocol_list (rprotos, sel_name, 0); 6329 6330 if (method_prototype) 6331 warning (0, "found %<-%s%> instead of %<+%s%> in protocol(s)", 6332 IDENTIFIER_POINTER (sel_name), 6333 IDENTIFIER_POINTER (sel_name)); 6334 } 6335 } 6336 } 6337 else if (rtype) 6338 { 6339 tree orig_rtype = rtype, saved_rtype; 6340 6341 if (TREE_CODE (rtype) == POINTER_TYPE) 6342 rtype = TREE_TYPE (rtype); 6343 /* Traverse typedef aliases */ 6344 while (TREE_CODE (rtype) == RECORD_TYPE && OBJC_TYPE_NAME (rtype) 6345 && TREE_CODE (OBJC_TYPE_NAME (rtype)) == TYPE_DECL 6346 && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (rtype))) 6347 rtype = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (rtype)); 6348 saved_rtype = rtype; 6349 if (TYPED_OBJECT (rtype)) 6350 { 6351 rprotos = TYPE_OBJC_PROTOCOL_LIST (rtype); 6352 rtype = TYPE_OBJC_INTERFACE (rtype); 6353 } 6354 /* If we could not find an @interface declaration, we must have 6355 only seen a @class declaration; so, we cannot say anything 6356 more intelligent about which methods the receiver will 6357 understand. */ 6358 if (!rtype || TREE_CODE (rtype) == IDENTIFIER_NODE) 6359 rtype = NULL_TREE; 6360 else if (TREE_CODE (rtype) == CLASS_INTERFACE_TYPE 6361 || TREE_CODE (rtype) == CLASS_IMPLEMENTATION_TYPE) 6362 { 6363 /* We have a valid ObjC class name. Look up the method name 6364 in the published @interface for the class (and its 6365 superclasses). */ 6366 method_prototype 6367 = lookup_method_static (rtype, sel_name, class_tree != NULL_TREE); 6368 6369 /* If the method was not found in the @interface, it may still 6370 exist locally as part of the @implementation. */ 6371 if (!method_prototype && objc_implementation_context 6372 && CLASS_NAME (objc_implementation_context) 6373 == OBJC_TYPE_NAME (rtype)) 6374 method_prototype 6375 = lookup_method 6376 ((class_tree 6377 ? CLASS_CLS_METHODS (objc_implementation_context) 6378 : CLASS_NST_METHODS (objc_implementation_context)), 6379 sel_name); 6380 6381 /* If we haven't found a candidate method by now, try looking for 6382 it in the protocol list. */ 6383 if (!method_prototype && rprotos) 6384 method_prototype 6385 = lookup_method_in_protocol_list (rprotos, sel_name, 6386 class_tree != NULL_TREE); 6387 } 6388 else 6389 { 6390 warning (0, "invalid receiver type %qs", 6391 gen_type_name (orig_rtype)); 6392 /* After issuing the "invalid receiver" warning, perform method 6393 lookup as if we were messaging 'id'. */ 6394 rtype = rprotos = NULL_TREE; 6395 } 6396 } 6397 6398 6399 /* For 'id' or 'Class' receivers, search in the global hash table 6400 as a last resort. For all receivers, warn if protocol searches 6401 have failed. */ 6402 if (!method_prototype) 6403 { 6404 if (rprotos) 6405 warning (0, "%<%c%s%> not found in protocol(s)", 6406 (class_tree ? '+' : '-'), 6407 IDENTIFIER_POINTER (sel_name)); 6408 6409 if (!rtype) 6410 method_prototype 6411 = lookup_method_in_hash_lists (sel_name, class_tree != NULL_TREE); 6412 } 6413 6414 if (!method_prototype) 6415 { 6416 static bool warn_missing_methods = false; 6417 6418 if (rtype) 6419 warning (0, "%qs may not respond to %<%c%s%>", 6420 IDENTIFIER_POINTER (OBJC_TYPE_NAME (rtype)), 6421 (class_tree ? '+' : '-'), 6422 IDENTIFIER_POINTER (sel_name)); 6423 /* If we are messaging an 'id' or 'Class' object and made it here, 6424 then we have failed to find _any_ instance or class method, 6425 respectively. */ 6426 else 6427 warning (0, "no %<%c%s%> method found", 6428 (class_tree ? '+' : '-'), 6429 IDENTIFIER_POINTER (sel_name)); 6430 6431 if (!warn_missing_methods) 6432 { 6433 warning (0, "(Messages without a matching method signature"); 6434 warning (0, "will be assumed to return %<id%> and accept"); 6435 warning (0, "%<...%> as arguments.)"); 6436 warn_missing_methods = true; 6437 } 6438 } 6439 6440 /* Save the selector name for printing error messages. */ 6441 current_objc_message_selector = sel_name; 6442 6443 /* Build the parameters list for looking up the method. 6444 These are the object itself and the selector. */ 6445 6446 if (flag_typed_selectors) 6447 selector = build_typed_selector_reference (sel_name, method_prototype); 6448 else 6449 selector = build_selector_reference (sel_name); 6450 6451 retval = build_objc_method_call (super, method_prototype, 6452 receiver, 6453 selector, method_params); 6454 6455 current_objc_message_selector = 0; 6456 6457 return retval; 6458} 6459 6460/* Build a tree expression to send OBJECT the operation SELECTOR, 6461 looking up the method on object LOOKUP_OBJECT (often same as OBJECT), 6462 assuming the method has prototype METHOD_PROTOTYPE. 6463 (That is an INSTANCE_METHOD_DECL or CLASS_METHOD_DECL.) 6464 Use METHOD_PARAMS as list of args to pass to the method. 6465 If SUPER_FLAG is nonzero, we look up the superclass's method. */ 6466 6467static tree 6468build_objc_method_call (int super_flag, tree method_prototype, 6469 tree lookup_object, tree selector, 6470 tree method_params) 6471{ 6472 tree sender = (super_flag ? umsg_super_decl : 6473 (!flag_next_runtime || flag_nil_receivers 6474 ? (flag_objc_direct_dispatch 6475 ? umsg_fast_decl 6476 : umsg_decl) 6477 : umsg_nonnil_decl)); 6478 tree rcv_p = (super_flag ? objc_super_type : objc_object_type); 6479 6480 /* If a prototype for the method to be called exists, then cast 6481 the sender's return type and arguments to match that of the method. 6482 Otherwise, leave sender as is. */ 6483 tree ret_type 6484 = (method_prototype 6485 ? TREE_VALUE (TREE_TYPE (method_prototype)) 6486 : objc_object_type); 6487 tree sender_cast 6488 = build_pointer_type 6489 (build_function_type 6490 (ret_type, 6491 get_arg_type_list 6492 (method_prototype, METHOD_REF, super_flag))); 6493 tree method, t; 6494 6495 lookup_object = build_c_cast (rcv_p, lookup_object); 6496 6497 /* Use SAVE_EXPR to avoid evaluating the receiver twice. */ 6498 lookup_object = save_expr (lookup_object); 6499 6500 if (flag_next_runtime) 6501 { 6502 /* If we are returning a struct in memory, and the address 6503 of that memory location is passed as a hidden first 6504 argument, then change which messenger entry point this 6505 expr will call. NB: Note that sender_cast remains 6506 unchanged (it already has a struct return type). */ 6507 if (!targetm.calls.struct_value_rtx (0, 0) 6508 && (TREE_CODE (ret_type) == RECORD_TYPE 6509 || TREE_CODE (ret_type) == UNION_TYPE) 6510 && targetm.calls.return_in_memory (ret_type, 0)) 6511 sender = (super_flag ? umsg_super_stret_decl : 6512 flag_nil_receivers ? umsg_stret_decl : umsg_nonnil_stret_decl); 6513 6514 method_params = tree_cons (NULL_TREE, lookup_object, 6515 tree_cons (NULL_TREE, selector, 6516 method_params)); 6517 method = build_fold_addr_expr (sender); 6518 } 6519 else 6520 { 6521 /* This is the portable (GNU) way. */ 6522 tree object; 6523 6524 /* First, call the lookup function to get a pointer to the method, 6525 then cast the pointer, then call it with the method arguments. */ 6526 6527 object = (super_flag ? self_decl : lookup_object); 6528 6529 t = tree_cons (NULL_TREE, selector, NULL_TREE); 6530 t = tree_cons (NULL_TREE, lookup_object, t); 6531 method = build_function_call (sender, t); 6532 6533 /* Pass the object to the method. */ 6534 method_params = tree_cons (NULL_TREE, object, 6535 tree_cons (NULL_TREE, selector, 6536 method_params)); 6537 } 6538 6539 /* ??? Selector is not at this point something we can use inside 6540 the compiler itself. Set it to garbage for the nonce. */ 6541 t = build3 (OBJ_TYPE_REF, sender_cast, method, lookup_object, size_zero_node); 6542 return build_function_call (t, method_params); 6543} 6544 6545static void 6546build_protocol_reference (tree p) 6547{ 6548 tree decl; 6549 const char *proto_name; 6550 6551 /* static struct _objc_protocol _OBJC_PROTOCOL_<mumble>; */ 6552 6553 proto_name = synth_id_with_class_suffix ("_OBJC_PROTOCOL", p); 6554 decl = start_var_decl (objc_protocol_template, proto_name); 6555 6556 PROTOCOL_FORWARD_DECL (p) = decl; 6557} 6558 6559/* This function is called by the parser when (and only when) a 6560 @protocol() expression is found, in order to compile it. */ 6561tree 6562objc_build_protocol_expr (tree protoname) 6563{ 6564 tree expr; 6565 tree p = lookup_protocol (protoname); 6566 6567 if (!p) 6568 { 6569 error ("cannot find protocol declaration for %qs", 6570 IDENTIFIER_POINTER (protoname)); 6571 return error_mark_node; 6572 } 6573 6574 if (!PROTOCOL_FORWARD_DECL (p)) 6575 build_protocol_reference (p); 6576 6577 expr = build_unary_op (ADDR_EXPR, PROTOCOL_FORWARD_DECL (p), 0); 6578 6579 /* ??? Ideally we'd build the reference with objc_protocol_type directly, 6580 if we have it, rather than converting it here. */ 6581 expr = convert (objc_protocol_type, expr); 6582 6583 /* The @protocol() expression is being compiled into a pointer to a 6584 statically allocated instance of the Protocol class. To become 6585 usable at runtime, the 'isa' pointer of the instance need to be 6586 fixed up at runtime by the runtime library, to point to the 6587 actual 'Protocol' class. */ 6588 6589 /* For the GNU runtime, put the static Protocol instance in the list 6590 of statically allocated instances, so that we make sure that its 6591 'isa' pointer is fixed up at runtime by the GNU runtime library 6592 to point to the Protocol class (at runtime, when loading the 6593 module, the GNU runtime library loops on the statically allocated 6594 instances (as found in the defs field in objc_symtab) and fixups 6595 all the 'isa' pointers of those objects). */ 6596 if (! flag_next_runtime) 6597 { 6598 /* This type is a struct containing the fields of a Protocol 6599 object. (Cfr. objc_protocol_type instead is the type of a pointer 6600 to such a struct). */ 6601 tree protocol_struct_type = xref_tag 6602 (RECORD_TYPE, get_identifier (PROTOCOL_OBJECT_CLASS_NAME)); 6603 tree *chain; 6604 6605 /* Look for the list of Protocol statically allocated instances 6606 to fixup at runtime. Create a new list to hold Protocol 6607 statically allocated instances, if the list is not found. At 6608 present there is only another list, holding NSConstantString 6609 static instances to be fixed up at runtime. */ 6610 for (chain = &objc_static_instances; 6611 *chain && TREE_VALUE (*chain) != protocol_struct_type; 6612 chain = &TREE_CHAIN (*chain)); 6613 if (!*chain) 6614 { 6615 *chain = tree_cons (NULL_TREE, protocol_struct_type, NULL_TREE); 6616 add_objc_string (OBJC_TYPE_NAME (protocol_struct_type), 6617 class_names); 6618 } 6619 6620 /* Add this statically allocated instance to the Protocol list. */ 6621 TREE_PURPOSE (*chain) = tree_cons (NULL_TREE, 6622 PROTOCOL_FORWARD_DECL (p), 6623 TREE_PURPOSE (*chain)); 6624 } 6625 6626 6627 return expr; 6628} 6629 6630/* This function is called by the parser when a @selector() expression 6631 is found, in order to compile it. It is only called by the parser 6632 and only to compile a @selector(). */ 6633tree 6634objc_build_selector_expr (tree selnamelist) 6635{ 6636 tree selname; 6637 6638 /* Obtain the full selector name. */ 6639 if (TREE_CODE (selnamelist) == IDENTIFIER_NODE) 6640 /* A unary selector. */ 6641 selname = selnamelist; 6642 else if (TREE_CODE (selnamelist) == TREE_LIST) 6643 selname = build_keyword_selector (selnamelist); 6644 else 6645 abort (); 6646 6647 /* If we are required to check @selector() expressions as they 6648 are found, check that the selector has been declared. */ 6649 if (warn_undeclared_selector) 6650 { 6651 /* Look the selector up in the list of all known class and 6652 instance methods (up to this line) to check that the selector 6653 exists. */ 6654 hash hsh; 6655 6656 /* First try with instance methods. */ 6657 hsh = hash_lookup (nst_method_hash_list, selname); 6658 6659 /* If not found, try with class methods. */ 6660 if (!hsh) 6661 { 6662 hsh = hash_lookup (cls_method_hash_list, selname); 6663 } 6664 6665 /* If still not found, print out a warning. */ 6666 if (!hsh) 6667 { 6668 warning (0, "undeclared selector %qs", IDENTIFIER_POINTER (selname)); 6669 } 6670 } 6671 6672 6673 if (flag_typed_selectors) 6674 return build_typed_selector_reference (selname, 0); 6675 else 6676 return build_selector_reference (selname); 6677} 6678 6679tree 6680objc_build_encode_expr (tree type) 6681{ 6682 tree result; 6683 const char *string; 6684 6685 encode_type (type, obstack_object_size (&util_obstack), 6686 OBJC_ENCODE_INLINE_DEFS); 6687 obstack_1grow (&util_obstack, 0); /* null terminate string */ 6688 string = obstack_finish (&util_obstack); 6689 6690 /* Synthesize a string that represents the encoded struct/union. */ 6691 result = my_build_string (strlen (string) + 1, string); 6692 obstack_free (&util_obstack, util_firstobj); 6693 return result; 6694} 6695 6696static tree 6697build_ivar_reference (tree id) 6698{ 6699 if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL) 6700 { 6701 /* Historically, a class method that produced objects (factory 6702 method) would assign `self' to the instance that it 6703 allocated. This would effectively turn the class method into 6704 an instance method. Following this assignment, the instance 6705 variables could be accessed. That practice, while safe, 6706 violates the simple rule that a class method should not refer 6707 to an instance variable. It's better to catch the cases 6708 where this is done unknowingly than to support the above 6709 paradigm. */ 6710 warning (0, "instance variable %qs accessed in class method", 6711 IDENTIFIER_POINTER (id)); 6712 self_decl = convert (objc_instance_type, self_decl); /* cast */ 6713 } 6714 6715 return objc_build_component_ref (build_indirect_ref (self_decl, "->"), id); 6716} 6717 6718/* Compute a hash value for a given method SEL_NAME. */ 6719 6720static size_t 6721hash_func (tree sel_name) 6722{ 6723 const unsigned char *s 6724 = (const unsigned char *)IDENTIFIER_POINTER (sel_name); 6725 size_t h = 0; 6726 6727 while (*s) 6728 h = h * 67 + *s++ - 113; 6729 return h; 6730} 6731 6732static void 6733hash_init (void) 6734{ 6735 nst_method_hash_list 6736 = (hash *) ggc_alloc_cleared (SIZEHASHTABLE * sizeof (hash)); 6737 cls_method_hash_list 6738 = (hash *) ggc_alloc_cleared (SIZEHASHTABLE * sizeof (hash)); 6739 6740 /* Initialize the hash table used to hold the constant string objects. */ 6741 string_htab = htab_create_ggc (31, string_hash, 6742 string_eq, NULL); 6743 6744 /* Initialize the hash table used to hold EH-volatilized types. */ 6745 volatilized_htab = htab_create_ggc (31, volatilized_hash, 6746 volatilized_eq, NULL); 6747} 6748 6749/* WARNING!!!! hash_enter is called with a method, and will peek 6750 inside to find its selector! But hash_lookup is given a selector 6751 directly, and looks for the selector that's inside the found 6752 entry's key (method) for comparison. */ 6753 6754static void 6755hash_enter (hash *hashlist, tree method) 6756{ 6757 hash obj; 6758 int slot = hash_func (METHOD_SEL_NAME (method)) % SIZEHASHTABLE; 6759 6760 obj = (hash) ggc_alloc (sizeof (struct hashed_entry)); 6761 obj->list = 0; 6762 obj->next = hashlist[slot]; 6763 obj->key = method; 6764 6765 hashlist[slot] = obj; /* append to front */ 6766} 6767 6768static hash 6769hash_lookup (hash *hashlist, tree sel_name) 6770{ 6771 hash target; 6772 6773 target = hashlist[hash_func (sel_name) % SIZEHASHTABLE]; 6774 6775 while (target) 6776 { 6777 if (sel_name == METHOD_SEL_NAME (target->key)) 6778 return target; 6779 6780 target = target->next; 6781 } 6782 return 0; 6783} 6784 6785static void 6786hash_add_attr (hash entry, tree value) 6787{ 6788 attr obj; 6789 6790 obj = (attr) ggc_alloc (sizeof (struct hashed_attribute)); 6791 obj->next = entry->list; 6792 obj->value = value; 6793 6794 entry->list = obj; /* append to front */ 6795} 6796 6797static tree 6798lookup_method (tree mchain, tree method) 6799{ 6800 tree key; 6801 6802 if (TREE_CODE (method) == IDENTIFIER_NODE) 6803 key = method; 6804 else 6805 key = METHOD_SEL_NAME (method); 6806 6807 while (mchain) 6808 { 6809 if (METHOD_SEL_NAME (mchain) == key) 6810 return mchain; 6811 6812 mchain = TREE_CHAIN (mchain); 6813 } 6814 return NULL_TREE; 6815} 6816 6817/* Look up a class (if OBJC_LOOKUP_CLASS is set in FLAGS) or instance method 6818 in INTERFACE, along with any categories and protocols attached thereto. 6819 If method is not found, and the OBJC_LOOKUP_NO_SUPER is _not_ set in FLAGS, 6820 recursively examine the INTERFACE's superclass. If OBJC_LOOKUP_CLASS is 6821 set, OBJC_LOOKUP_NO_SUPER is cleared, and no suitable class method could 6822 be found in INTERFACE or any of its superclasses, look for an _instance_ 6823 method of the same name in the root class as a last resort. 6824 6825 If a suitable method cannot be found, return NULL_TREE. */ 6826 6827static tree 6828lookup_method_static (tree interface, tree ident, int flags) 6829{ 6830 tree meth = NULL_TREE, root_inter = NULL_TREE; 6831 tree inter = interface; 6832 int is_class = (flags & OBJC_LOOKUP_CLASS); 6833 int no_superclasses = (flags & OBJC_LOOKUP_NO_SUPER); 6834 6835 while (inter) 6836 { 6837 tree chain = is_class ? CLASS_CLS_METHODS (inter) : CLASS_NST_METHODS (inter); 6838 tree category = inter; 6839 6840 /* First, look up the method in the class itself. */ 6841 if ((meth = lookup_method (chain, ident))) 6842 return meth; 6843 6844 /* Failing that, look for the method in each category of the class. */ 6845 while ((category = CLASS_CATEGORY_LIST (category))) 6846 { 6847 chain = is_class ? CLASS_CLS_METHODS (category) : CLASS_NST_METHODS (category); 6848 6849 /* Check directly in each category. */ 6850 if ((meth = lookup_method (chain, ident))) 6851 return meth; 6852 6853 /* Failing that, check in each category's protocols. */ 6854 if (CLASS_PROTOCOL_LIST (category)) 6855 { 6856 if ((meth = (lookup_method_in_protocol_list 6857 (CLASS_PROTOCOL_LIST (category), ident, is_class)))) 6858 return meth; 6859 } 6860 } 6861 6862 /* If not found in categories, check in protocols of the main class. */ 6863 if (CLASS_PROTOCOL_LIST (inter)) 6864 { 6865 if ((meth = (lookup_method_in_protocol_list 6866 (CLASS_PROTOCOL_LIST (inter), ident, is_class)))) 6867 return meth; 6868 } 6869 6870 /* If we were instructed not to look in superclasses, don't. */ 6871 if (no_superclasses) 6872 return NULL_TREE; 6873 6874 /* Failing that, climb up the inheritance hierarchy. */ 6875 root_inter = inter; 6876 inter = lookup_interface (CLASS_SUPER_NAME (inter)); 6877 } 6878 while (inter); 6879 6880 /* If no class (factory) method was found, check if an _instance_ 6881 method of the same name exists in the root class. This is what 6882 the Objective-C runtime will do. If an instance method was not 6883 found, return 0. */ 6884 return is_class ? lookup_method_static (root_inter, ident, 0): NULL_TREE; 6885} 6886 6887/* Add the method to the hash list if it doesn't contain an identical 6888 method already. */ 6889 6890static void 6891add_method_to_hash_list (hash *hash_list, tree method) 6892{ 6893 hash hsh; 6894 6895 if (!(hsh = hash_lookup (hash_list, METHOD_SEL_NAME (method)))) 6896 { 6897 /* Install on a global chain. */ 6898 hash_enter (hash_list, method); 6899 } 6900 else 6901 { 6902 /* Check types against those; if different, add to a list. */ 6903 attr loop; 6904 int already_there = comp_proto_with_proto (method, hsh->key, 1); 6905 for (loop = hsh->list; !already_there && loop; loop = loop->next) 6906 already_there |= comp_proto_with_proto (method, loop->value, 1); 6907 if (!already_there) 6908 hash_add_attr (hsh, method); 6909 } 6910} 6911 6912static tree 6913objc_add_method (tree class, tree method, int is_class) 6914{ 6915 tree mth; 6916 6917 if (!(mth = lookup_method (is_class 6918 ? CLASS_CLS_METHODS (class) 6919 : CLASS_NST_METHODS (class), method))) 6920 { 6921 /* put method on list in reverse order */ 6922 if (is_class) 6923 { 6924 TREE_CHAIN (method) = CLASS_CLS_METHODS (class); 6925 CLASS_CLS_METHODS (class) = method; 6926 } 6927 else 6928 { 6929 TREE_CHAIN (method) = CLASS_NST_METHODS (class); 6930 CLASS_NST_METHODS (class) = method; 6931 } 6932 } 6933 else 6934 { 6935 /* When processing an @interface for a class or category, give hard 6936 errors on methods with identical selectors but differing argument 6937 and/or return types. We do not do this for @implementations, because 6938 C/C++ will do it for us (i.e., there will be duplicate function 6939 definition errors). */ 6940 if ((TREE_CODE (class) == CLASS_INTERFACE_TYPE 6941 || TREE_CODE (class) == CATEGORY_INTERFACE_TYPE) 6942 && !comp_proto_with_proto (method, mth, 1)) 6943 error ("duplicate declaration of method %<%c%s%>", 6944 is_class ? '+' : '-', 6945 IDENTIFIER_POINTER (METHOD_SEL_NAME (mth))); 6946 } 6947 6948 if (is_class) 6949 add_method_to_hash_list (cls_method_hash_list, method); 6950 else 6951 { 6952 add_method_to_hash_list (nst_method_hash_list, method); 6953 6954 /* Instance methods in root classes (and categories thereof) 6955 may act as class methods as a last resort. We also add 6956 instance methods listed in @protocol declarations to 6957 the class hash table, on the assumption that @protocols 6958 may be adopted by root classes or categories. */ 6959 if (TREE_CODE (class) == CATEGORY_INTERFACE_TYPE 6960 || TREE_CODE (class) == CATEGORY_IMPLEMENTATION_TYPE) 6961 class = lookup_interface (CLASS_NAME (class)); 6962 6963 if (TREE_CODE (class) == PROTOCOL_INTERFACE_TYPE 6964 || !CLASS_SUPER_NAME (class)) 6965 add_method_to_hash_list (cls_method_hash_list, method); 6966 } 6967 6968 return method; 6969} 6970 6971static tree 6972add_class (tree class_name, tree name) 6973{ 6974 struct interface_tuple **slot; 6975 6976 /* Put interfaces on list in reverse order. */ 6977 TREE_CHAIN (class_name) = interface_chain; 6978 interface_chain = class_name; 6979 6980 if (interface_htab == NULL) 6981 interface_htab = htab_create_ggc (31, hash_interface, eq_interface, NULL); 6982 slot = (struct interface_tuple **) 6983 htab_find_slot_with_hash (interface_htab, name, 6984 IDENTIFIER_HASH_VALUE (name), 6985 INSERT); 6986 if (!*slot) 6987 { 6988 *slot = (struct interface_tuple *) ggc_alloc_cleared (sizeof (struct interface_tuple)); 6989 (*slot)->id = name; 6990 } 6991 (*slot)->class_name = class_name; 6992 6993 return interface_chain; 6994} 6995 6996static void 6997add_category (tree class, tree category) 6998{ 6999 /* Put categories on list in reverse order. */ 7000 tree cat = lookup_category (class, CLASS_SUPER_NAME (category)); 7001 7002 if (cat) 7003 { 7004 warning (0, "duplicate interface declaration for category %<%s(%s)%>", 7005 IDENTIFIER_POINTER (CLASS_NAME (class)), 7006 IDENTIFIER_POINTER (CLASS_SUPER_NAME (category))); 7007 } 7008 else 7009 { 7010 CLASS_CATEGORY_LIST (category) = CLASS_CATEGORY_LIST (class); 7011 CLASS_CATEGORY_LIST (class) = category; 7012 } 7013} 7014 7015/* Called after parsing each instance variable declaration. Necessary to 7016 preserve typedefs and implement public/private... 7017 7018 PUBLIC is 1 for public, 0 for protected, and 2 for private. */ 7019 7020static tree 7021add_instance_variable (tree class, int public, tree field_decl) 7022{ 7023 tree field_type = TREE_TYPE (field_decl); 7024 const char *ivar_name = DECL_NAME (field_decl) 7025 ? IDENTIFIER_POINTER (DECL_NAME (field_decl)) 7026 : "<unnamed>"; 7027 7028#ifdef OBJCPLUS 7029 if (TREE_CODE (field_type) == REFERENCE_TYPE) 7030 { 7031 error ("illegal reference type specified for instance variable %qs", 7032 ivar_name); 7033 /* Return class as is without adding this ivar. */ 7034 return class; 7035 } 7036#endif 7037 7038 if (field_type == error_mark_node || !TYPE_SIZE (field_type) 7039 || TYPE_SIZE (field_type) == error_mark_node) 7040 /* 'type[0]' is allowed, but 'type[]' is not! */ 7041 { 7042 error ("instance variable %qs has unknown size", ivar_name); 7043 /* Return class as is without adding this ivar. */ 7044 return class; 7045 } 7046 7047#ifdef OBJCPLUS 7048 /* Check if the ivar being added has a non-POD C++ type. If so, we will 7049 need to either (1) warn the user about it or (2) generate suitable 7050 constructor/destructor call from '- .cxx_construct' or '- .cxx_destruct' 7051 methods (if '-fobjc-call-cxx-cdtors' was specified). */ 7052 if (IS_AGGR_TYPE (field_type) 7053 && (TYPE_NEEDS_CONSTRUCTING (field_type) 7054 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type) 7055 || TYPE_POLYMORPHIC_P (field_type))) 7056 { 7057 const char *type_name = IDENTIFIER_POINTER (OBJC_TYPE_NAME (field_type)); 7058 7059 if (flag_objc_call_cxx_cdtors) 7060 { 7061 /* Since the ObjC runtime will be calling the constructors and 7062 destructors for us, the only thing we can't handle is the lack 7063 of a default constructor. */ 7064 if (TYPE_NEEDS_CONSTRUCTING (field_type) 7065 && !TYPE_HAS_DEFAULT_CONSTRUCTOR (field_type)) 7066 { 7067 warning (0, "type %qs has no default constructor to call", 7068 type_name); 7069 7070 /* If we cannot call a constructor, we should also avoid 7071 calling the destructor, for symmetry. */ 7072 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type)) 7073 warning (0, "destructor for %qs shall not be run either", 7074 type_name); 7075 } 7076 } 7077 else 7078 { 7079 static bool warn_cxx_ivars = false; 7080 7081 if (TYPE_POLYMORPHIC_P (field_type)) 7082 { 7083 /* Vtable pointers are Real Bad(tm), since Obj-C cannot 7084 initialize them. */ 7085 error ("type %qs has virtual member functions", type_name); 7086 error ("illegal aggregate type %qs specified " 7087 "for instance variable %qs", 7088 type_name, ivar_name); 7089 /* Return class as is without adding this ivar. */ 7090 return class; 7091 } 7092 7093 /* User-defined constructors and destructors are not known to Obj-C 7094 and hence will not be called. This may or may not be a problem. */ 7095 if (TYPE_NEEDS_CONSTRUCTING (field_type)) 7096 warning (0, "type %qs has a user-defined constructor", type_name); 7097 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type)) 7098 warning (0, "type %qs has a user-defined destructor", type_name); 7099 7100 if (!warn_cxx_ivars) 7101 { 7102 warning (0, "C++ constructors and destructors will not " 7103 "be invoked for Objective-C fields"); 7104 warn_cxx_ivars = true; 7105 } 7106 } 7107 } 7108#endif 7109 7110 /* Overload the public attribute, it is not used for FIELD_DECLs. */ 7111 switch (public) 7112 { 7113 case 0: 7114 TREE_PUBLIC (field_decl) = 0; 7115 TREE_PRIVATE (field_decl) = 0; 7116 TREE_PROTECTED (field_decl) = 1; 7117 break; 7118 7119 case 1: 7120 TREE_PUBLIC (field_decl) = 1; 7121 TREE_PRIVATE (field_decl) = 0; 7122 TREE_PROTECTED (field_decl) = 0; 7123 break; 7124 7125 case 2: 7126 TREE_PUBLIC (field_decl) = 0; 7127 TREE_PRIVATE (field_decl) = 1; 7128 TREE_PROTECTED (field_decl) = 0; 7129 break; 7130 7131 } 7132 7133 CLASS_RAW_IVARS (class) = chainon (CLASS_RAW_IVARS (class), field_decl); 7134 7135 return class; 7136} 7137 7138static tree 7139is_ivar (tree decl_chain, tree ident) 7140{ 7141 for ( ; decl_chain; decl_chain = TREE_CHAIN (decl_chain)) 7142 if (DECL_NAME (decl_chain) == ident) 7143 return decl_chain; 7144 return NULL_TREE; 7145} 7146 7147/* True if the ivar is private and we are not in its implementation. */ 7148 7149static int 7150is_private (tree decl) 7151{ 7152 return (TREE_PRIVATE (decl) 7153 && ! is_ivar (CLASS_IVARS (implementation_template), 7154 DECL_NAME (decl))); 7155} 7156 7157/* We have an instance variable reference;, check to see if it is public. */ 7158 7159int 7160objc_is_public (tree expr, tree identifier) 7161{ 7162 tree basetype, decl; 7163 7164#ifdef OBJCPLUS 7165 if (processing_template_decl) 7166 return 1; 7167#endif 7168 7169 if (TREE_TYPE (expr) == error_mark_node) 7170 return 1; 7171 7172 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); 7173 7174 if (basetype && TREE_CODE (basetype) == RECORD_TYPE) 7175 { 7176 if (TYPE_HAS_OBJC_INFO (basetype) && TYPE_OBJC_INTERFACE (basetype)) 7177 { 7178 tree class = lookup_interface (OBJC_TYPE_NAME (basetype)); 7179 7180 if (!class) 7181 { 7182 error ("cannot find interface declaration for %qs", 7183 IDENTIFIER_POINTER (OBJC_TYPE_NAME (basetype))); 7184 return 0; 7185 } 7186 7187 if ((decl = is_ivar (get_class_ivars (class, true), identifier))) 7188 { 7189 if (TREE_PUBLIC (decl)) 7190 return 1; 7191 7192 /* Important difference between the Stepstone translator: 7193 all instance variables should be public within the context 7194 of the implementation. */ 7195 if (objc_implementation_context 7196 && ((TREE_CODE (objc_implementation_context) 7197 == CLASS_IMPLEMENTATION_TYPE) 7198 || (TREE_CODE (objc_implementation_context) 7199 == CATEGORY_IMPLEMENTATION_TYPE))) 7200 { 7201 tree curtype = TYPE_MAIN_VARIANT 7202 (CLASS_STATIC_TEMPLATE 7203 (implementation_template)); 7204 7205 if (basetype == curtype 7206 || DERIVED_FROM_P (basetype, curtype)) 7207 { 7208 int private = is_private (decl); 7209 7210 if (private) 7211 error ("instance variable %qs is declared private", 7212 IDENTIFIER_POINTER (DECL_NAME (decl))); 7213 7214 return !private; 7215 } 7216 } 7217 7218 /* The 2.95.2 compiler sometimes allowed C functions to access 7219 non-@public ivars. We will let this slide for now... */ 7220 if (!objc_method_context) 7221 { 7222 warning (0, "instance variable %qs is %s; " 7223 "this will be a hard error in the future", 7224 IDENTIFIER_POINTER (identifier), 7225 TREE_PRIVATE (decl) ? "@private" : "@protected"); 7226 return 1; 7227 } 7228 7229 error ("instance variable %qs is declared %s", 7230 IDENTIFIER_POINTER (identifier), 7231 TREE_PRIVATE (decl) ? "private" : "protected"); 7232 return 0; 7233 } 7234 } 7235 } 7236 7237 return 1; 7238} 7239 7240/* Make sure all entries in CHAIN are also in LIST. */ 7241 7242static int 7243check_methods (tree chain, tree list, int mtype) 7244{ 7245 int first = 1; 7246 7247 while (chain) 7248 { 7249 if (!lookup_method (list, chain)) 7250 { 7251 if (first) 7252 { 7253 if (TREE_CODE (objc_implementation_context) 7254 == CLASS_IMPLEMENTATION_TYPE) 7255 warning (0, "incomplete implementation of class %qs", 7256 IDENTIFIER_POINTER (CLASS_NAME (objc_implementation_context))); 7257 else if (TREE_CODE (objc_implementation_context) 7258 == CATEGORY_IMPLEMENTATION_TYPE) 7259 warning (0, "incomplete implementation of category %qs", 7260 IDENTIFIER_POINTER (CLASS_SUPER_NAME (objc_implementation_context))); 7261 first = 0; 7262 } 7263 7264 warning (0, "method definition for %<%c%s%> not found", 7265 mtype, IDENTIFIER_POINTER (METHOD_SEL_NAME (chain))); 7266 } 7267 7268 chain = TREE_CHAIN (chain); 7269 } 7270 7271 return first; 7272} 7273 7274/* Check if CLASS, or its superclasses, explicitly conforms to PROTOCOL. */ 7275 7276static int 7277conforms_to_protocol (tree class, tree protocol) 7278{ 7279 if (TREE_CODE (protocol) == PROTOCOL_INTERFACE_TYPE) 7280 { 7281 tree p = CLASS_PROTOCOL_LIST (class); 7282 while (p && TREE_VALUE (p) != protocol) 7283 p = TREE_CHAIN (p); 7284 7285 if (!p) 7286 { 7287 tree super = (CLASS_SUPER_NAME (class) 7288 ? lookup_interface (CLASS_SUPER_NAME (class)) 7289 : NULL_TREE); 7290 int tmp = super ? conforms_to_protocol (super, protocol) : 0; 7291 if (!tmp) 7292 return 0; 7293 } 7294 } 7295 7296 return 1; 7297} 7298 7299/* Make sure all methods in CHAIN are accessible as MTYPE methods in 7300 CONTEXT. This is one of two mechanisms to check protocol integrity. */ 7301 7302static int 7303check_methods_accessible (tree chain, tree context, int mtype) 7304{ 7305 int first = 1; 7306 tree list; 7307 tree base_context = context; 7308 7309 while (chain) 7310 { 7311 context = base_context; 7312 while (context) 7313 { 7314 if (mtype == '+') 7315 list = CLASS_CLS_METHODS (context); 7316 else 7317 list = CLASS_NST_METHODS (context); 7318 7319 if (lookup_method (list, chain)) 7320 break; 7321 7322 else if (TREE_CODE (context) == CLASS_IMPLEMENTATION_TYPE 7323 || TREE_CODE (context) == CLASS_INTERFACE_TYPE) 7324 context = (CLASS_SUPER_NAME (context) 7325 ? lookup_interface (CLASS_SUPER_NAME (context)) 7326 : NULL_TREE); 7327 7328 else if (TREE_CODE (context) == CATEGORY_IMPLEMENTATION_TYPE 7329 || TREE_CODE (context) == CATEGORY_INTERFACE_TYPE) 7330 context = (CLASS_NAME (context) 7331 ? lookup_interface (CLASS_NAME (context)) 7332 : NULL_TREE); 7333 else 7334 abort (); 7335 } 7336 7337 if (context == NULL_TREE) 7338 { 7339 if (first) 7340 { 7341 if (TREE_CODE (objc_implementation_context) 7342 == CLASS_IMPLEMENTATION_TYPE) 7343 warning (0, "incomplete implementation of class %qs", 7344 IDENTIFIER_POINTER 7345 (CLASS_NAME (objc_implementation_context))); 7346 else if (TREE_CODE (objc_implementation_context) 7347 == CATEGORY_IMPLEMENTATION_TYPE) 7348 warning (0, "incomplete implementation of category %qs", 7349 IDENTIFIER_POINTER 7350 (CLASS_SUPER_NAME (objc_implementation_context))); 7351 first = 0; 7352 } 7353 warning (0, "method definition for %<%c%s%> not found", 7354 mtype, IDENTIFIER_POINTER (METHOD_SEL_NAME (chain))); 7355 } 7356 7357 chain = TREE_CHAIN (chain); /* next method... */ 7358 } 7359 return first; 7360} 7361 7362/* Check whether the current interface (accessible via 7363 'objc_implementation_context') actually implements protocol P, along 7364 with any protocols that P inherits. */ 7365 7366static void 7367check_protocol (tree p, const char *type, const char *name) 7368{ 7369 if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) 7370 { 7371 int f1, f2; 7372 7373 /* Ensure that all protocols have bodies! */ 7374 if (warn_protocol) 7375 { 7376 f1 = check_methods (PROTOCOL_CLS_METHODS (p), 7377 CLASS_CLS_METHODS (objc_implementation_context), 7378 '+'); 7379 f2 = check_methods (PROTOCOL_NST_METHODS (p), 7380 CLASS_NST_METHODS (objc_implementation_context), 7381 '-'); 7382 } 7383 else 7384 { 7385 f1 = check_methods_accessible (PROTOCOL_CLS_METHODS (p), 7386 objc_implementation_context, 7387 '+'); 7388 f2 = check_methods_accessible (PROTOCOL_NST_METHODS (p), 7389 objc_implementation_context, 7390 '-'); 7391 } 7392 7393 if (!f1 || !f2) 7394 warning (0, "%s %qs does not fully implement the %qs protocol", 7395 type, name, IDENTIFIER_POINTER (PROTOCOL_NAME (p))); 7396 } 7397 7398 /* Check protocols recursively. */ 7399 if (PROTOCOL_LIST (p)) 7400 { 7401 tree subs = PROTOCOL_LIST (p); 7402 tree super_class = 7403 lookup_interface (CLASS_SUPER_NAME (implementation_template)); 7404 7405 while (subs) 7406 { 7407 tree sub = TREE_VALUE (subs); 7408 7409 /* If the superclass does not conform to the protocols 7410 inherited by P, then we must! */ 7411 if (!super_class || !conforms_to_protocol (super_class, sub)) 7412 check_protocol (sub, type, name); 7413 subs = TREE_CHAIN (subs); 7414 } 7415 } 7416} 7417 7418/* Check whether the current interface (accessible via 7419 'objc_implementation_context') actually implements the protocols listed 7420 in PROTO_LIST. */ 7421 7422static void 7423check_protocols (tree proto_list, const char *type, const char *name) 7424{ 7425 for ( ; proto_list; proto_list = TREE_CHAIN (proto_list)) 7426 { 7427 tree p = TREE_VALUE (proto_list); 7428 7429 check_protocol (p, type, name); 7430 } 7431} 7432 7433/* Make sure that the class CLASS_NAME is defined 7434 CODE says which kind of thing CLASS_NAME ought to be. 7435 It can be CLASS_INTERFACE_TYPE, CLASS_IMPLEMENTATION_TYPE, 7436 CATEGORY_INTERFACE_TYPE, or CATEGORY_IMPLEMENTATION_TYPE. */ 7437 7438static tree 7439start_class (enum tree_code code, tree class_name, tree super_name, 7440 tree protocol_list) 7441{ 7442 tree class, decl; 7443 7444#ifdef OBJCPLUS 7445 if (current_namespace != global_namespace) { 7446 error ("Objective-C declarations may only appear in global scope"); 7447 } 7448#endif /* OBJCPLUS */ 7449 7450 if (objc_implementation_context) 7451 { 7452 warning (0, "%<@end%> missing in implementation context"); 7453 finish_class (objc_implementation_context); 7454 objc_ivar_chain = NULL_TREE; 7455 objc_implementation_context = NULL_TREE; 7456 } 7457 7458 class = make_node (code); 7459 TYPE_LANG_SLOT_1 (class) = make_tree_vec (CLASS_LANG_SLOT_ELTS); 7460 7461 /* Check for existence of the super class, if one was specified. Note 7462 that we must have seen an @interface, not just a @class. If we 7463 are looking at a @compatibility_alias, traverse it first. */ 7464 if ((code == CLASS_INTERFACE_TYPE || code == CLASS_IMPLEMENTATION_TYPE) 7465 && super_name) 7466 { 7467 tree super = objc_is_class_name (super_name); 7468 7469 if (!super || !lookup_interface (super)) 7470 { 7471 error ("cannot find interface declaration for %qs, superclass of %qs", 7472 IDENTIFIER_POINTER (super ? super : super_name), 7473 IDENTIFIER_POINTER (class_name)); 7474 super_name = NULL_TREE; 7475 } 7476 else 7477 super_name = super; 7478 } 7479 7480 CLASS_NAME (class) = class_name; 7481 CLASS_SUPER_NAME (class) = super_name; 7482 CLASS_CLS_METHODS (class) = NULL_TREE; 7483 7484 if (! objc_is_class_name (class_name) 7485 && (decl = lookup_name (class_name))) 7486 { 7487 error ("%qs redeclared as different kind of symbol", 7488 IDENTIFIER_POINTER (class_name)); 7489 error ("previous declaration of %q+D", 7490 decl); 7491 } 7492 7493 if (code == CLASS_IMPLEMENTATION_TYPE) 7494 { 7495 { 7496 tree chain; 7497 7498 for (chain = implemented_classes; chain; chain = TREE_CHAIN (chain)) 7499 if (TREE_VALUE (chain) == class_name) 7500 { 7501 error ("reimplementation of class %qs", 7502 IDENTIFIER_POINTER (class_name)); 7503 return error_mark_node; 7504 } 7505 implemented_classes = tree_cons (NULL_TREE, class_name, 7506 implemented_classes); 7507 } 7508 7509 /* Reset for multiple classes per file. */ 7510 method_slot = 0; 7511 7512 objc_implementation_context = class; 7513 7514 /* Lookup the interface for this implementation. */ 7515 7516 if (!(implementation_template = lookup_interface (class_name))) 7517 { 7518 warning (0, "cannot find interface declaration for %qs", 7519 IDENTIFIER_POINTER (class_name)); 7520 add_class (implementation_template = objc_implementation_context, 7521 class_name); 7522 } 7523 7524 /* If a super class has been specified in the implementation, 7525 insure it conforms to the one specified in the interface. */ 7526 7527 if (super_name 7528 && (super_name != CLASS_SUPER_NAME (implementation_template))) 7529 { 7530 tree previous_name = CLASS_SUPER_NAME (implementation_template); 7531 const char *const name = 7532 previous_name ? IDENTIFIER_POINTER (previous_name) : ""; 7533 error ("conflicting super class name %qs", 7534 IDENTIFIER_POINTER (super_name)); 7535 error ("previous declaration of %qs", name); 7536 } 7537 7538 else if (! super_name) 7539 { 7540 CLASS_SUPER_NAME (objc_implementation_context) 7541 = CLASS_SUPER_NAME (implementation_template); 7542 } 7543 } 7544 7545 else if (code == CLASS_INTERFACE_TYPE) 7546 { 7547 if (lookup_interface (class_name)) 7548#ifdef OBJCPLUS 7549 error ("duplicate interface declaration for class %qs", 7550#else 7551 warning (0, "duplicate interface declaration for class %qs", 7552#endif 7553 IDENTIFIER_POINTER (class_name)); 7554 else 7555 add_class (class, class_name); 7556 7557 if (protocol_list) 7558 CLASS_PROTOCOL_LIST (class) 7559 = lookup_and_install_protocols (protocol_list); 7560 } 7561 7562 else if (code == CATEGORY_INTERFACE_TYPE) 7563 { 7564 tree class_category_is_assoc_with; 7565 7566 /* For a category, class_name is really the name of the class that 7567 the following set of methods will be associated with. We must 7568 find the interface so that can derive the objects template. */ 7569 7570 if (!(class_category_is_assoc_with = lookup_interface (class_name))) 7571 { 7572 error ("cannot find interface declaration for %qs", 7573 IDENTIFIER_POINTER (class_name)); 7574 exit (FATAL_EXIT_CODE); 7575 } 7576 else 7577 add_category (class_category_is_assoc_with, class); 7578 7579 if (protocol_list) 7580 CLASS_PROTOCOL_LIST (class) 7581 = lookup_and_install_protocols (protocol_list); 7582 } 7583 7584 else if (code == CATEGORY_IMPLEMENTATION_TYPE) 7585 { 7586 /* Reset for multiple classes per file. */ 7587 method_slot = 0; 7588 7589 objc_implementation_context = class; 7590 7591 /* For a category, class_name is really the name of the class that 7592 the following set of methods will be associated with. We must 7593 find the interface so that can derive the objects template. */ 7594 7595 if (!(implementation_template = lookup_interface (class_name))) 7596 { 7597 error ("cannot find interface declaration for %qs", 7598 IDENTIFIER_POINTER (class_name)); 7599 exit (FATAL_EXIT_CODE); 7600 } 7601 } 7602 return class; 7603} 7604 7605static tree 7606continue_class (tree class) 7607{ 7608 if (TREE_CODE (class) == CLASS_IMPLEMENTATION_TYPE 7609 || TREE_CODE (class) == CATEGORY_IMPLEMENTATION_TYPE) 7610 { 7611 struct imp_entry *imp_entry; 7612 7613 /* Check consistency of the instance variables. */ 7614 7615 if (CLASS_RAW_IVARS (class)) 7616 check_ivars (implementation_template, class); 7617 7618 /* code generation */ 7619 7620#ifdef OBJCPLUS 7621 push_lang_context (lang_name_c); 7622#endif 7623 7624 build_private_template (implementation_template); 7625 uprivate_record = CLASS_STATIC_TEMPLATE (implementation_template); 7626 objc_instance_type = build_pointer_type (uprivate_record); 7627 7628 imp_entry = (struct imp_entry *) ggc_alloc (sizeof (struct imp_entry)); 7629 7630 imp_entry->next = imp_list; 7631 imp_entry->imp_context = class; 7632 imp_entry->imp_template = implementation_template; 7633 7634 synth_forward_declarations (); 7635 imp_entry->class_decl = UOBJC_CLASS_decl; 7636 imp_entry->meta_decl = UOBJC_METACLASS_decl; 7637 imp_entry->has_cxx_cdtors = 0; 7638 7639 /* Append to front and increment count. */ 7640 imp_list = imp_entry; 7641 if (TREE_CODE (class) == CLASS_IMPLEMENTATION_TYPE) 7642 imp_count++; 7643 else 7644 cat_count++; 7645 7646#ifdef OBJCPLUS 7647 pop_lang_context (); 7648#endif /* OBJCPLUS */ 7649 7650 return get_class_ivars (implementation_template, true); 7651 } 7652 7653 else if (TREE_CODE (class) == CLASS_INTERFACE_TYPE) 7654 { 7655#ifdef OBJCPLUS 7656 push_lang_context (lang_name_c); 7657#endif /* OBJCPLUS */ 7658 7659 build_private_template (class); 7660 7661#ifdef OBJCPLUS 7662 pop_lang_context (); 7663#endif /* OBJCPLUS */ 7664 7665 return NULL_TREE; 7666 } 7667 7668 else 7669 return error_mark_node; 7670} 7671 7672/* This is called once we see the "@end" in an interface/implementation. */ 7673 7674static void 7675finish_class (tree class) 7676{ 7677 if (TREE_CODE (class) == CLASS_IMPLEMENTATION_TYPE) 7678 { 7679 /* All code generation is done in finish_objc. */ 7680 7681 if (implementation_template != objc_implementation_context) 7682 { 7683 /* Ensure that all method listed in the interface contain bodies. */ 7684 check_methods (CLASS_CLS_METHODS (implementation_template), 7685 CLASS_CLS_METHODS (objc_implementation_context), '+'); 7686 check_methods (CLASS_NST_METHODS (implementation_template), 7687 CLASS_NST_METHODS (objc_implementation_context), '-'); 7688 7689 if (CLASS_PROTOCOL_LIST (implementation_template)) 7690 check_protocols (CLASS_PROTOCOL_LIST (implementation_template), 7691 "class", 7692 IDENTIFIER_POINTER (CLASS_NAME (objc_implementation_context))); 7693 } 7694 } 7695 7696 else if (TREE_CODE (class) == CATEGORY_IMPLEMENTATION_TYPE) 7697 { 7698 tree category = lookup_category (implementation_template, CLASS_SUPER_NAME (class)); 7699 7700 if (category) 7701 { 7702 /* Ensure all method listed in the interface contain bodies. */ 7703 check_methods (CLASS_CLS_METHODS (category), 7704 CLASS_CLS_METHODS (objc_implementation_context), '+'); 7705 check_methods (CLASS_NST_METHODS (category), 7706 CLASS_NST_METHODS (objc_implementation_context), '-'); 7707 7708 if (CLASS_PROTOCOL_LIST (category)) 7709 check_protocols (CLASS_PROTOCOL_LIST (category), 7710 "category", 7711 IDENTIFIER_POINTER (CLASS_SUPER_NAME (objc_implementation_context))); 7712 } 7713 } 7714} 7715 7716static tree 7717add_protocol (tree protocol) 7718{ 7719 /* Put protocol on list in reverse order. */ 7720 TREE_CHAIN (protocol) = protocol_chain; 7721 protocol_chain = protocol; 7722 return protocol_chain; 7723} 7724 7725static tree 7726lookup_protocol (tree ident) 7727{ 7728 tree chain; 7729 7730 for (chain = protocol_chain; chain; chain = TREE_CHAIN (chain)) 7731 if (ident == PROTOCOL_NAME (chain)) 7732 return chain; 7733 7734 return NULL_TREE; 7735} 7736 7737/* This function forward declares the protocols named by NAMES. If 7738 they are already declared or defined, the function has no effect. */ 7739 7740void 7741objc_declare_protocols (tree names) 7742{ 7743 tree list; 7744 7745#ifdef OBJCPLUS 7746 if (current_namespace != global_namespace) { 7747 error ("Objective-C declarations may only appear in global scope"); 7748 } 7749#endif /* OBJCPLUS */ 7750 7751 for (list = names; list; list = TREE_CHAIN (list)) 7752 { 7753 tree name = TREE_VALUE (list); 7754 7755 if (lookup_protocol (name) == NULL_TREE) 7756 { 7757 tree protocol = make_node (PROTOCOL_INTERFACE_TYPE); 7758 7759 TYPE_LANG_SLOT_1 (protocol) 7760 = make_tree_vec (PROTOCOL_LANG_SLOT_ELTS); 7761 PROTOCOL_NAME (protocol) = name; 7762 PROTOCOL_LIST (protocol) = NULL_TREE; 7763 add_protocol (protocol); 7764 PROTOCOL_DEFINED (protocol) = 0; 7765 PROTOCOL_FORWARD_DECL (protocol) = NULL_TREE; 7766 } 7767 } 7768} 7769 7770static tree 7771start_protocol (enum tree_code code, tree name, tree list) 7772{ 7773 tree protocol; 7774 7775#ifdef OBJCPLUS 7776 if (current_namespace != global_namespace) { 7777 error ("Objective-C declarations may only appear in global scope"); 7778 } 7779#endif /* OBJCPLUS */ 7780 7781 protocol = lookup_protocol (name); 7782 7783 if (!protocol) 7784 { 7785 protocol = make_node (code); 7786 TYPE_LANG_SLOT_1 (protocol) = make_tree_vec (PROTOCOL_LANG_SLOT_ELTS); 7787 7788 PROTOCOL_NAME (protocol) = name; 7789 PROTOCOL_LIST (protocol) = lookup_and_install_protocols (list); 7790 add_protocol (protocol); 7791 PROTOCOL_DEFINED (protocol) = 1; 7792 PROTOCOL_FORWARD_DECL (protocol) = NULL_TREE; 7793 7794 check_protocol_recursively (protocol, list); 7795 } 7796 else if (! PROTOCOL_DEFINED (protocol)) 7797 { 7798 PROTOCOL_DEFINED (protocol) = 1; 7799 PROTOCOL_LIST (protocol) = lookup_and_install_protocols (list); 7800 7801 check_protocol_recursively (protocol, list); 7802 } 7803 else 7804 { 7805 warning (0, "duplicate declaration for protocol %qs", 7806 IDENTIFIER_POINTER (name)); 7807 } 7808 return protocol; 7809} 7810 7811 7812/* "Encode" a data type into a string, which grows in util_obstack. 7813 ??? What is the FORMAT? Someone please document this! */ 7814 7815static void 7816encode_type_qualifiers (tree declspecs) 7817{ 7818 tree spec; 7819 7820 for (spec = declspecs; spec; spec = TREE_CHAIN (spec)) 7821 { 7822 if (ridpointers[(int) RID_IN] == TREE_VALUE (spec)) 7823 obstack_1grow (&util_obstack, 'n'); 7824 else if (ridpointers[(int) RID_INOUT] == TREE_VALUE (spec)) 7825 obstack_1grow (&util_obstack, 'N'); 7826 else if (ridpointers[(int) RID_OUT] == TREE_VALUE (spec)) 7827 obstack_1grow (&util_obstack, 'o'); 7828 else if (ridpointers[(int) RID_BYCOPY] == TREE_VALUE (spec)) 7829 obstack_1grow (&util_obstack, 'O'); 7830 else if (ridpointers[(int) RID_BYREF] == TREE_VALUE (spec)) 7831 obstack_1grow (&util_obstack, 'R'); 7832 else if (ridpointers[(int) RID_ONEWAY] == TREE_VALUE (spec)) 7833 obstack_1grow (&util_obstack, 'V'); 7834 } 7835} 7836 7837/* Encode a pointer type. */ 7838 7839static void 7840encode_pointer (tree type, int curtype, int format) 7841{ 7842 tree pointer_to = TREE_TYPE (type); 7843 7844 if (TREE_CODE (pointer_to) == RECORD_TYPE) 7845 { 7846 if (OBJC_TYPE_NAME (pointer_to) 7847 && TREE_CODE (OBJC_TYPE_NAME (pointer_to)) == IDENTIFIER_NODE) 7848 { 7849 const char *name = IDENTIFIER_POINTER (OBJC_TYPE_NAME (pointer_to)); 7850 7851 if (strcmp (name, TAG_OBJECT) == 0) /* '@' */ 7852 { 7853 obstack_1grow (&util_obstack, '@'); 7854 return; 7855 } 7856 else if (TYPE_HAS_OBJC_INFO (pointer_to) 7857 && TYPE_OBJC_INTERFACE (pointer_to)) 7858 { 7859 if (generating_instance_variables) 7860 { 7861 obstack_1grow (&util_obstack, '@'); 7862 obstack_1grow (&util_obstack, '"'); 7863 obstack_grow (&util_obstack, name, strlen (name)); 7864 obstack_1grow (&util_obstack, '"'); 7865 return; 7866 } 7867 else 7868 { 7869 obstack_1grow (&util_obstack, '@'); 7870 return; 7871 } 7872 } 7873 else if (strcmp (name, TAG_CLASS) == 0) /* '#' */ 7874 { 7875 obstack_1grow (&util_obstack, '#'); 7876 return; 7877 } 7878 else if (strcmp (name, TAG_SELECTOR) == 0) /* ':' */ 7879 { 7880 obstack_1grow (&util_obstack, ':'); 7881 return; 7882 } 7883 } 7884 } 7885 else if (TREE_CODE (pointer_to) == INTEGER_TYPE 7886 && TYPE_MODE (pointer_to) == QImode) 7887 { 7888 tree pname = TREE_CODE (OBJC_TYPE_NAME (pointer_to)) == IDENTIFIER_NODE 7889 ? OBJC_TYPE_NAME (pointer_to) 7890 : DECL_NAME (OBJC_TYPE_NAME (pointer_to)); 7891 7892 if (!flag_next_runtime || strcmp (IDENTIFIER_POINTER (pname), "BOOL")) 7893 { 7894 /* It appears that "r*" means "const char *" rather than 7895 "char *const". */ 7896 if (TYPE_READONLY (pointer_to)) 7897 obstack_1grow (&util_obstack, 'r'); 7898 7899 obstack_1grow (&util_obstack, '*'); 7900 return; 7901 } 7902 } 7903 7904 /* We have a type that does not get special treatment. */ 7905 7906 /* NeXT extension */ 7907 obstack_1grow (&util_obstack, '^'); 7908 encode_type (pointer_to, curtype, format); 7909} 7910 7911static void 7912encode_array (tree type, int curtype, int format) 7913{ 7914 tree an_int_cst = TYPE_SIZE (type); 7915 tree array_of = TREE_TYPE (type); 7916 char buffer[40]; 7917 7918 /* An incomplete array is treated like a pointer. */ 7919 if (an_int_cst == NULL) 7920 { 7921 encode_pointer (type, curtype, format); 7922 return; 7923 } 7924 7925 if (TREE_INT_CST_LOW (TYPE_SIZE (array_of)) == 0) 7926 sprintf (buffer, "[" HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)0); 7927 else 7928 sprintf (buffer, "[" HOST_WIDE_INT_PRINT_DEC, 7929 TREE_INT_CST_LOW (an_int_cst) 7930 / TREE_INT_CST_LOW (TYPE_SIZE (array_of))); 7931 7932 obstack_grow (&util_obstack, buffer, strlen (buffer)); 7933 encode_type (array_of, curtype, format); 7934 obstack_1grow (&util_obstack, ']'); 7935 return; 7936} 7937 7938static void 7939encode_aggregate_fields (tree type, int pointed_to, int curtype, int format) 7940{ 7941 tree field = TYPE_FIELDS (type); 7942 7943 for (; field; field = TREE_CHAIN (field)) 7944 { 7945#ifdef OBJCPLUS 7946 /* C++ static members, and things that are not field at all, 7947 should not appear in the encoding. */ 7948 if (TREE_CODE (field) != FIELD_DECL || TREE_STATIC (field)) 7949 continue; 7950#endif 7951 7952 /* Recursively encode fields of embedded base classes. */ 7953 if (DECL_ARTIFICIAL (field) && !DECL_NAME (field) 7954 && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE) 7955 { 7956 encode_aggregate_fields (TREE_TYPE (field), 7957 pointed_to, curtype, format); 7958 continue; 7959 } 7960 7961 if (generating_instance_variables && !pointed_to) 7962 { 7963 tree fname = DECL_NAME (field); 7964 7965 obstack_1grow (&util_obstack, '"'); 7966 7967 if (fname && TREE_CODE (fname) == IDENTIFIER_NODE) 7968 obstack_grow (&util_obstack, 7969 IDENTIFIER_POINTER (fname), 7970 strlen (IDENTIFIER_POINTER (fname))); 7971 7972 obstack_1grow (&util_obstack, '"'); 7973 } 7974 7975 encode_field_decl (field, curtype, format); 7976 } 7977} 7978 7979static void 7980encode_aggregate_within (tree type, int curtype, int format, int left, 7981 int right) 7982{ 7983 tree name; 7984 /* NB: aggregates that are pointed to have slightly different encoding 7985 rules in that you never encode the names of instance variables. */ 7986 int ob_size = obstack_object_size (&util_obstack); 7987 char c1 = ob_size > 1 ? *(obstack_next_free (&util_obstack) - 2) : 0; 7988 char c0 = ob_size > 0 ? *(obstack_next_free (&util_obstack) - 1) : 0; 7989 int pointed_to = (c0 == '^' || (c1 == '^' && c0 == 'r')); 7990 int inline_contents 7991 = ((format == OBJC_ENCODE_INLINE_DEFS || generating_instance_variables) 7992 && (!pointed_to || ob_size - curtype == (c1 == 'r' ? 2 : 1))); 7993 7994 /* Traverse struct aliases; it is important to get the 7995 original struct and its tag name (if any). */ 7996 type = TYPE_MAIN_VARIANT (type); 7997 name = OBJC_TYPE_NAME (type); 7998 /* Open parenth/bracket. */ 7999 obstack_1grow (&util_obstack, left); 8000 8001 /* Encode the struct/union tag name, or '?' if a tag was 8002 not provided. Typedef aliases do not qualify. */ 8003 if (name && TREE_CODE (name) == IDENTIFIER_NODE 8004#ifdef OBJCPLUS 8005 /* Did this struct have a tag? */ 8006 && !TYPE_WAS_ANONYMOUS (type) 8007#endif 8008 ) 8009 obstack_grow (&util_obstack, 8010 IDENTIFIER_POINTER (name), 8011 strlen (IDENTIFIER_POINTER (name))); 8012 else 8013 obstack_1grow (&util_obstack, '?'); 8014 8015 /* Encode the types (and possibly names) of the inner fields, 8016 if required. */ 8017 if (inline_contents) 8018 { 8019 obstack_1grow (&util_obstack, '='); 8020 encode_aggregate_fields (type, pointed_to, curtype, format); 8021 } 8022 /* Close parenth/bracket. */ 8023 obstack_1grow (&util_obstack, right); 8024} 8025 8026static void 8027encode_aggregate (tree type, int curtype, int format) 8028{ 8029 enum tree_code code = TREE_CODE (type); 8030 8031 switch (code) 8032 { 8033 case RECORD_TYPE: 8034 { 8035 encode_aggregate_within (type, curtype, format, '{', '}'); 8036 break; 8037 } 8038 case UNION_TYPE: 8039 { 8040 encode_aggregate_within (type, curtype, format, '(', ')'); 8041 break; 8042 } 8043 8044 case ENUMERAL_TYPE: 8045 obstack_1grow (&util_obstack, 'i'); 8046 break; 8047 8048 default: 8049 break; 8050 } 8051} 8052 8053/* Encode a bitfield NeXT-style (i.e., without a bit offset or the underlying 8054 field type. */ 8055 8056static void 8057encode_next_bitfield (int width) 8058{ 8059 char buffer[40]; 8060 sprintf (buffer, "b%d", width); 8061 obstack_grow (&util_obstack, buffer, strlen (buffer)); 8062} 8063 8064/* FORMAT will be OBJC_ENCODE_INLINE_DEFS or OBJC_ENCODE_DONT_INLINE_DEFS. */ 8065static void 8066encode_type (tree type, int curtype, int format) 8067{ 8068 enum tree_code code = TREE_CODE (type); 8069 char c; 8070 8071 if (TYPE_READONLY (type)) 8072 obstack_1grow (&util_obstack, 'r'); 8073 8074 if (code == INTEGER_TYPE) 8075 { 8076 switch (GET_MODE_BITSIZE (TYPE_MODE (type))) 8077 { 8078 case 8: c = TYPE_UNSIGNED (type) ? 'C' : 'c'; break; 8079 case 16: c = TYPE_UNSIGNED (type) ? 'S' : 's'; break; 8080 case 32: 8081 if (type == long_unsigned_type_node 8082 || type == long_integer_type_node) 8083 c = TYPE_UNSIGNED (type) ? 'L' : 'l'; 8084 else 8085 c = TYPE_UNSIGNED (type) ? 'I' : 'i'; 8086 break; 8087 case 64: c = TYPE_UNSIGNED (type) ? 'Q' : 'q'; break; 8088 default: abort (); 8089 } 8090 obstack_1grow (&util_obstack, c); 8091 } 8092 8093 else if (code == REAL_TYPE) 8094 { 8095 /* Floating point types. */ 8096 switch (GET_MODE_BITSIZE (TYPE_MODE (type))) 8097 { 8098 case 32: c = 'f'; break; 8099 case 64: 8100 case 96: 8101 case 128: c = 'd'; break; 8102 default: abort (); 8103 } 8104 obstack_1grow (&util_obstack, c); 8105 } 8106 8107 else if (code == VOID_TYPE) 8108 obstack_1grow (&util_obstack, 'v'); 8109 8110 else if (code == BOOLEAN_TYPE) 8111 obstack_1grow (&util_obstack, 'B'); 8112 8113 else if (code == ARRAY_TYPE) 8114 encode_array (type, curtype, format); 8115 8116 else if (code == POINTER_TYPE) 8117 encode_pointer (type, curtype, format); 8118 8119 else if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) 8120 encode_aggregate (type, curtype, format); 8121 8122 else if (code == FUNCTION_TYPE) /* '?' */ 8123 obstack_1grow (&util_obstack, '?'); 8124 8125 else if (code == COMPLEX_TYPE) 8126 { 8127 obstack_1grow (&util_obstack, 'j'); 8128 encode_type (TREE_TYPE (type), curtype, format); 8129 } 8130} 8131 8132static void 8133encode_gnu_bitfield (int position, tree type, int size) 8134{ 8135 enum tree_code code = TREE_CODE (type); 8136 char buffer[40]; 8137 char charType = '?'; 8138 8139 if (code == INTEGER_TYPE) 8140 { 8141 if (integer_zerop (TYPE_MIN_VALUE (type))) 8142 { 8143 /* Unsigned integer types. */ 8144 8145 if (TYPE_MODE (type) == QImode) 8146 charType = 'C'; 8147 else if (TYPE_MODE (type) == HImode) 8148 charType = 'S'; 8149 else if (TYPE_MODE (type) == SImode) 8150 { 8151 if (type == long_unsigned_type_node) 8152 charType = 'L'; 8153 else 8154 charType = 'I'; 8155 } 8156 else if (TYPE_MODE (type) == DImode) 8157 charType = 'Q'; 8158 } 8159 8160 else 8161 /* Signed integer types. */ 8162 { 8163 if (TYPE_MODE (type) == QImode) 8164 charType = 'c'; 8165 else if (TYPE_MODE (type) == HImode) 8166 charType = 's'; 8167 else if (TYPE_MODE (type) == SImode) 8168 { 8169 if (type == long_integer_type_node) 8170 charType = 'l'; 8171 else 8172 charType = 'i'; 8173 } 8174 8175 else if (TYPE_MODE (type) == DImode) 8176 charType = 'q'; 8177 } 8178 } 8179 else if (code == ENUMERAL_TYPE) 8180 charType = 'i'; 8181 else 8182 abort (); 8183 8184 sprintf (buffer, "b%d%c%d", position, charType, size); 8185 obstack_grow (&util_obstack, buffer, strlen (buffer)); 8186} 8187 8188static void 8189encode_field_decl (tree field_decl, int curtype, int format) 8190{ 8191 tree type; 8192 8193#ifdef OBJCPLUS 8194 /* C++ static members, and things that are not fields at all, 8195 should not appear in the encoding. */ 8196 if (TREE_CODE (field_decl) != FIELD_DECL || TREE_STATIC (field_decl)) 8197 return; 8198#endif 8199 8200 type = TREE_TYPE (field_decl); 8201 8202 /* Generate the bitfield typing information, if needed. Note the difference 8203 between GNU and NeXT runtimes. */ 8204 if (DECL_BIT_FIELD_TYPE (field_decl)) 8205 { 8206 int size = tree_low_cst (DECL_SIZE (field_decl), 1); 8207 8208 if (flag_next_runtime) 8209 encode_next_bitfield (size); 8210 else 8211 encode_gnu_bitfield (int_bit_position (field_decl), 8212 DECL_BIT_FIELD_TYPE (field_decl), size); 8213 } 8214 else 8215 encode_type (TREE_TYPE (field_decl), curtype, format); 8216} 8217 8218static GTY(()) tree objc_parmlist = NULL_TREE; 8219 8220/* Append PARM to a list of formal parameters of a method, making a necessary 8221 array-to-pointer adjustment along the way. */ 8222 8223static void 8224objc_push_parm (tree parm) 8225{ 8226 bool relayout_needed = false; 8227 /* Decay arrays and functions into pointers. */ 8228 if (TREE_CODE (TREE_TYPE (parm)) == ARRAY_TYPE) 8229 { 8230 TREE_TYPE (parm) = build_pointer_type (TREE_TYPE (TREE_TYPE (parm))); 8231 relayout_needed = true; 8232 } 8233 else if (TREE_CODE (TREE_TYPE (parm)) == FUNCTION_TYPE) 8234 { 8235 TREE_TYPE (parm) = build_pointer_type (TREE_TYPE (parm)); 8236 relayout_needed = true; 8237 } 8238 8239 if (relayout_needed) 8240 relayout_decl (parm); 8241 8242 8243 DECL_ARG_TYPE (parm) 8244 = lang_hooks.types.type_promotes_to (TREE_TYPE (parm)); 8245 8246 /* Record constancy and volatility. */ 8247 c_apply_type_quals_to_decl 8248 ((TYPE_READONLY (TREE_TYPE (parm)) ? TYPE_QUAL_CONST : 0) 8249 | (TYPE_RESTRICT (TREE_TYPE (parm)) ? TYPE_QUAL_RESTRICT : 0) 8250 | (TYPE_VOLATILE (TREE_TYPE (parm)) ? TYPE_QUAL_VOLATILE : 0), parm); 8251 8252 objc_parmlist = chainon (objc_parmlist, parm); 8253} 8254 8255/* Retrieve the formal parameter list constructed via preceding calls to 8256 objc_push_parm(). */ 8257 8258#ifdef OBJCPLUS 8259static tree 8260objc_get_parm_info (int have_ellipsis ATTRIBUTE_UNUSED) 8261#else 8262static struct c_arg_info * 8263objc_get_parm_info (int have_ellipsis) 8264#endif 8265{ 8266#ifdef OBJCPLUS 8267 tree parm_info = objc_parmlist; 8268 objc_parmlist = NULL_TREE; 8269 8270 return parm_info; 8271#else 8272 tree parm_info = objc_parmlist; 8273 struct c_arg_info *arg_info; 8274 /* The C front-end requires an elaborate song and dance at 8275 this point. */ 8276 push_scope (); 8277 declare_parm_level (); 8278 while (parm_info) 8279 { 8280 tree next = TREE_CHAIN (parm_info); 8281 8282 TREE_CHAIN (parm_info) = NULL_TREE; 8283 parm_info = pushdecl (parm_info); 8284 finish_decl (parm_info, NULL_TREE, NULL_TREE); 8285 parm_info = next; 8286 } 8287 arg_info = get_parm_info (have_ellipsis); 8288 pop_scope (); 8289 objc_parmlist = NULL_TREE; 8290 return arg_info; 8291#endif 8292} 8293 8294/* Synthesize the formal parameters 'id self' and 'SEL _cmd' needed for ObjC 8295 method definitions. In the case of instance methods, we can be more 8296 specific as to the type of 'self'. */ 8297 8298static void 8299synth_self_and_ucmd_args (void) 8300{ 8301 tree self_type; 8302 8303 if (objc_method_context 8304 && TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL) 8305 self_type = objc_instance_type; 8306 else 8307 /* Really a `struct objc_class *'. However, we allow people to 8308 assign to self, which changes its type midstream. */ 8309 self_type = objc_object_type; 8310 8311 /* id self; */ 8312 objc_push_parm (build_decl (PARM_DECL, self_id, self_type)); 8313 8314 /* SEL _cmd; */ 8315 objc_push_parm (build_decl (PARM_DECL, ucmd_id, objc_selector_type)); 8316} 8317 8318/* Transform an Objective-C method definition into a static C function 8319 definition, synthesizing the first two arguments, "self" and "_cmd", 8320 in the process. */ 8321 8322static void 8323start_method_def (tree method) 8324{ 8325 tree parmlist; 8326#ifdef OBJCPLUS 8327 tree parm_info; 8328#else 8329 struct c_arg_info *parm_info; 8330#endif 8331 int have_ellipsis = 0; 8332 8333 /* If we are defining a "dealloc" method in a non-root class, we 8334 will need to check if a [super dealloc] is missing, and warn if 8335 it is. */ 8336 if(CLASS_SUPER_NAME (objc_implementation_context) 8337 && !strcmp ("dealloc", IDENTIFIER_POINTER (METHOD_SEL_NAME (method)))) 8338 should_call_super_dealloc = 1; 8339 else 8340 should_call_super_dealloc = 0; 8341 8342 /* Required to implement _msgSuper. */ 8343 objc_method_context = method; 8344 UOBJC_SUPER_decl = NULL_TREE; 8345 8346 /* Generate prototype declarations for arguments..."new-style". */ 8347 synth_self_and_ucmd_args (); 8348 8349 /* Generate argument declarations if a keyword_decl. */ 8350 parmlist = METHOD_SEL_ARGS (method); 8351 while (parmlist) 8352 { 8353 tree type = TREE_VALUE (TREE_TYPE (parmlist)), parm; 8354 8355 parm = build_decl (PARM_DECL, KEYWORD_ARG_NAME (parmlist), type); 8356 objc_push_parm (parm); 8357 parmlist = TREE_CHAIN (parmlist); 8358 } 8359 8360 if (METHOD_ADD_ARGS (method)) 8361 { 8362 tree akey; 8363 8364 for (akey = TREE_CHAIN (METHOD_ADD_ARGS (method)); 8365 akey; akey = TREE_CHAIN (akey)) 8366 { 8367 objc_push_parm (TREE_VALUE (akey)); 8368 } 8369 8370 if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) 8371 have_ellipsis = 1; 8372 } 8373 8374 parm_info = objc_get_parm_info (have_ellipsis); 8375 8376 really_start_method (objc_method_context, parm_info); 8377} 8378 8379static void 8380warn_with_method (const char *message, int mtype, tree method) 8381{ 8382 /* Add a readable method name to the warning. */ 8383 warning (0, "%J%s %<%c%s%>", method, 8384 message, mtype, gen_method_decl (method)); 8385} 8386 8387/* Return 1 if TYPE1 is equivalent to TYPE2 8388 for purposes of method overloading. */ 8389 8390static int 8391objc_types_are_equivalent (tree type1, tree type2) 8392{ 8393 if (type1 == type2) 8394 return 1; 8395 8396 /* Strip away indirections. */ 8397 while ((TREE_CODE (type1) == ARRAY_TYPE || TREE_CODE (type1) == POINTER_TYPE) 8398 && (TREE_CODE (type1) == TREE_CODE (type2))) 8399 type1 = TREE_TYPE (type1), type2 = TREE_TYPE (type2); 8400 if (TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2)) 8401 return 0; 8402 8403 type1 = (TYPE_HAS_OBJC_INFO (type1) 8404 ? TYPE_OBJC_PROTOCOL_LIST (type1) 8405 : NULL_TREE); 8406 type2 = (TYPE_HAS_OBJC_INFO (type2) 8407 ? TYPE_OBJC_PROTOCOL_LIST (type2) 8408 : NULL_TREE); 8409 8410 if (list_length (type1) == list_length (type2)) 8411 { 8412 for (; type2; type2 = TREE_CHAIN (type2)) 8413 if (!lookup_protocol_in_reflist (type1, TREE_VALUE (type2))) 8414 return 0; 8415 return 1; 8416 } 8417 return 0; 8418} 8419 8420/* Return 1 if TYPE1 has the same size and alignment as TYPE2. */ 8421 8422static int 8423objc_types_share_size_and_alignment (tree type1, tree type2) 8424{ 8425 return (simple_cst_equal (TYPE_SIZE (type1), TYPE_SIZE (type2)) 8426 && TYPE_ALIGN (type1) == TYPE_ALIGN (type2)); 8427} 8428 8429/* Return 1 if PROTO1 is equivalent to PROTO2 8430 for purposes of method overloading. Ordinarily, the type signatures 8431 should match up exactly, unless STRICT is zero, in which case we 8432 shall allow differences in which the size and alignment of a type 8433 is the same. */ 8434 8435static int 8436comp_proto_with_proto (tree proto1, tree proto2, int strict) 8437{ 8438 tree type1, type2; 8439 8440 /* The following test is needed in case there are hashing 8441 collisions. */ 8442 if (METHOD_SEL_NAME (proto1) != METHOD_SEL_NAME (proto2)) 8443 return 0; 8444 8445 /* Compare return types. */ 8446 type1 = TREE_VALUE (TREE_TYPE (proto1)); 8447 type2 = TREE_VALUE (TREE_TYPE (proto2)); 8448 8449 if (!objc_types_are_equivalent (type1, type2) 8450 && (strict || !objc_types_share_size_and_alignment (type1, type2))) 8451 return 0; 8452 8453 /* Compare argument types. */ 8454 for (type1 = get_arg_type_list (proto1, METHOD_REF, 0), 8455 type2 = get_arg_type_list (proto2, METHOD_REF, 0); 8456 type1 && type2; 8457 type1 = TREE_CHAIN (type1), type2 = TREE_CHAIN (type2)) 8458 { 8459 if (!objc_types_are_equivalent (TREE_VALUE (type1), TREE_VALUE (type2)) 8460 && (strict 8461 || !objc_types_share_size_and_alignment (TREE_VALUE (type1), 8462 TREE_VALUE (type2)))) 8463 return 0; 8464 } 8465 8466 return (!type1 && !type2); 8467} 8468 8469/* Fold an OBJ_TYPE_REF expression for ObjC method dispatches, where 8470 this occurs. ObjC method dispatches are _not_ like C++ virtual 8471 member function dispatches, and we account for the difference here. */ 8472tree 8473#ifdef OBJCPLUS 8474objc_fold_obj_type_ref (tree ref, tree known_type) 8475#else 8476objc_fold_obj_type_ref (tree ref ATTRIBUTE_UNUSED, 8477 tree known_type ATTRIBUTE_UNUSED) 8478#endif 8479{ 8480#ifdef OBJCPLUS 8481 tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type)); 8482 8483 /* If the receiver does not have virtual member functions, there 8484 is nothing we can (or need to) do here. */ 8485 if (!v) 8486 return NULL_TREE; 8487 8488 /* Let C++ handle C++ virtual functions. */ 8489 return cp_fold_obj_type_ref (ref, known_type); 8490#else 8491 /* For plain ObjC, we currently do not need to do anything. */ 8492 return NULL_TREE; 8493#endif 8494} 8495 8496static void 8497objc_start_function (tree name, tree type, tree attrs, 8498#ifdef OBJCPLUS 8499 tree params 8500#else 8501 struct c_arg_info *params 8502#endif 8503 ) 8504{ 8505 tree fndecl = build_decl (FUNCTION_DECL, name, type); 8506 8507#ifdef OBJCPLUS 8508 DECL_ARGUMENTS (fndecl) = params; 8509 DECL_INITIAL (fndecl) = error_mark_node; 8510 DECL_EXTERNAL (fndecl) = 0; 8511 TREE_STATIC (fndecl) = 1; 8512 retrofit_lang_decl (fndecl); 8513 cplus_decl_attributes (&fndecl, attrs, 0); 8514 start_preparsed_function (fndecl, attrs, /*flags=*/SF_DEFAULT); 8515#else 8516 struct c_label_context_se *nstack_se; 8517 struct c_label_context_vm *nstack_vm; 8518 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se); 8519 nstack_se->labels_def = NULL; 8520 nstack_se->labels_used = NULL; 8521 nstack_se->next = label_context_stack_se; 8522 label_context_stack_se = nstack_se; 8523 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm); 8524 nstack_vm->labels_def = NULL; 8525 nstack_vm->labels_used = NULL; 8526 nstack_vm->scope = 0; 8527 nstack_vm->next = label_context_stack_vm; 8528 label_context_stack_vm = nstack_vm; 8529 current_function_returns_value = 0; /* Assume, until we see it does. */ 8530 current_function_returns_null = 0; 8531 8532 decl_attributes (&fndecl, attrs, 0); 8533 announce_function (fndecl); 8534 DECL_INITIAL (fndecl) = error_mark_node; 8535 DECL_EXTERNAL (fndecl) = 0; 8536 TREE_STATIC (fndecl) = 1; 8537 current_function_decl = pushdecl (fndecl); 8538 push_scope (); 8539 declare_parm_level (); 8540 DECL_RESULT (current_function_decl) 8541 = build_decl (RESULT_DECL, NULL_TREE, 8542 TREE_TYPE (TREE_TYPE (current_function_decl))); 8543 DECL_ARTIFICIAL (DECL_RESULT (current_function_decl)) = 1; 8544 DECL_IGNORED_P (DECL_RESULT (current_function_decl)) = 1; 8545 start_fname_decls (); 8546 store_parm_decls_from (params); 8547#endif 8548 8549 TREE_USED (current_function_decl) = 1; 8550} 8551 8552/* - Generate an identifier for the function. the format is "_n_cls", 8553 where 1 <= n <= nMethods, and cls is the name the implementation we 8554 are processing. 8555 - Install the return type from the method declaration. 8556 - If we have a prototype, check for type consistency. */ 8557 8558static void 8559really_start_method (tree method, 8560#ifdef OBJCPLUS 8561 tree parmlist 8562#else 8563 struct c_arg_info *parmlist 8564#endif 8565 ) 8566{ 8567 tree ret_type, meth_type; 8568 tree method_id; 8569 const char *sel_name, *class_name, *cat_name; 8570 char *buf; 8571 8572 /* Synth the storage class & assemble the return type. */ 8573 ret_type = TREE_VALUE (TREE_TYPE (method)); 8574 8575 sel_name = IDENTIFIER_POINTER (METHOD_SEL_NAME (method)); 8576 class_name = IDENTIFIER_POINTER (CLASS_NAME (objc_implementation_context)); 8577 cat_name = ((TREE_CODE (objc_implementation_context) 8578 == CLASS_IMPLEMENTATION_TYPE) 8579 ? NULL 8580 : IDENTIFIER_POINTER (CLASS_SUPER_NAME (objc_implementation_context))); 8581 method_slot++; 8582 8583 /* Make sure this is big enough for any plausible method label. */ 8584 buf = (char *) alloca (50 + strlen (sel_name) + strlen (class_name) 8585 + (cat_name ? strlen (cat_name) : 0)); 8586 8587 OBJC_GEN_METHOD_LABEL (buf, TREE_CODE (method) == INSTANCE_METHOD_DECL, 8588 class_name, cat_name, sel_name, method_slot); 8589 8590 method_id = get_identifier (buf); 8591 8592#ifdef OBJCPLUS 8593 /* Objective-C methods cannot be overloaded, so we don't need 8594 the type encoding appended. It looks bad anyway... */ 8595 push_lang_context (lang_name_c); 8596#endif 8597 8598 meth_type 8599 = build_function_type (ret_type, 8600 get_arg_type_list (method, METHOD_DEF, 0)); 8601 objc_start_function (method_id, meth_type, NULL_TREE, parmlist); 8602 8603 /* Set self_decl from the first argument. */ 8604 self_decl = DECL_ARGUMENTS (current_function_decl); 8605 8606 /* Suppress unused warnings. */ 8607 TREE_USED (self_decl) = 1; 8608 TREE_USED (TREE_CHAIN (self_decl)) = 1; 8609#ifdef OBJCPLUS 8610 pop_lang_context (); 8611#endif 8612 8613 METHOD_DEFINITION (method) = current_function_decl; 8614 8615 /* Check consistency...start_function, pushdecl, duplicate_decls. */ 8616 8617 if (implementation_template != objc_implementation_context) 8618 { 8619 tree proto 8620 = lookup_method_static (implementation_template, 8621 METHOD_SEL_NAME (method), 8622 ((TREE_CODE (method) == CLASS_METHOD_DECL) 8623 | OBJC_LOOKUP_NO_SUPER)); 8624 8625 if (proto) 8626 { 8627 if (!comp_proto_with_proto (method, proto, 1)) 8628 { 8629 char type = (TREE_CODE (method) == INSTANCE_METHOD_DECL ? '-' : '+'); 8630 8631 warn_with_method ("conflicting types for", type, method); 8632 warn_with_method ("previous declaration of", type, proto); 8633 } 8634 } 8635 else 8636 { 8637 /* We have a method @implementation even though we did not 8638 see a corresponding @interface declaration (which is allowed 8639 by Objective-C rules). Go ahead and place the method in 8640 the @interface anyway, so that message dispatch lookups 8641 will see it. */ 8642 tree interface = implementation_template; 8643 8644 if (TREE_CODE (objc_implementation_context) 8645 == CATEGORY_IMPLEMENTATION_TYPE) 8646 interface = lookup_category 8647 (interface, 8648 CLASS_SUPER_NAME (objc_implementation_context)); 8649 8650 if (interface) 8651 objc_add_method (interface, copy_node (method), 8652 TREE_CODE (method) == CLASS_METHOD_DECL); 8653 } 8654 } 8655} 8656 8657static void *UOBJC_SUPER_scope = 0; 8658 8659/* _n_Method (id self, SEL sel, ...) 8660 { 8661 struct objc_super _S; 8662 _msgSuper ((_S.self = self, _S.class = _cls, &_S), ...); 8663 } */ 8664 8665static tree 8666get_super_receiver (void) 8667{ 8668 if (objc_method_context) 8669 { 8670 tree super_expr, super_expr_list; 8671 8672 if (!UOBJC_SUPER_decl) 8673 { 8674 UOBJC_SUPER_decl = build_decl (VAR_DECL, get_identifier (TAG_SUPER), 8675 objc_super_template); 8676 /* This prevents `unused variable' warnings when compiling with -Wall. */ 8677 TREE_USED (UOBJC_SUPER_decl) = 1; 8678 lang_hooks.decls.pushdecl (UOBJC_SUPER_decl); 8679 finish_decl (UOBJC_SUPER_decl, NULL_TREE, NULL_TREE); 8680 UOBJC_SUPER_scope = objc_get_current_scope (); 8681 } 8682 8683 /* Set receiver to self. */ 8684 super_expr = objc_build_component_ref (UOBJC_SUPER_decl, self_id); 8685 super_expr = build_modify_expr (super_expr, NOP_EXPR, self_decl); 8686 super_expr_list = super_expr; 8687 8688 /* Set class to begin searching. */ 8689 super_expr = objc_build_component_ref (UOBJC_SUPER_decl, 8690 get_identifier ("super_class")); 8691 8692 if (TREE_CODE (objc_implementation_context) == CLASS_IMPLEMENTATION_TYPE) 8693 { 8694 /* [_cls, __cls]Super are "pre-built" in 8695 synth_forward_declarations. */ 8696 8697 super_expr = build_modify_expr (super_expr, NOP_EXPR, 8698 ((TREE_CODE (objc_method_context) 8699 == INSTANCE_METHOD_DECL) 8700 ? ucls_super_ref 8701 : uucls_super_ref)); 8702 } 8703 8704 else 8705 /* We have a category. */ 8706 { 8707 tree super_name = CLASS_SUPER_NAME (implementation_template); 8708 tree super_class; 8709 8710 /* Barf if super used in a category of Object. */ 8711 if (!super_name) 8712 { 8713 error ("no super class declared in interface for %qs", 8714 IDENTIFIER_POINTER (CLASS_NAME (implementation_template))); 8715 return error_mark_node; 8716 } 8717 8718 if (flag_next_runtime && !flag_zero_link) 8719 { 8720 super_class = objc_get_class_reference (super_name); 8721 if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL) 8722 /* If we are in a class method, we must retrieve the 8723 _metaclass_ for the current class, pointed at by 8724 the class's "isa" pointer. The following assumes that 8725 "isa" is the first ivar in a class (which it must be). */ 8726 super_class 8727 = build_indirect_ref 8728 (build_c_cast (build_pointer_type (objc_class_type), 8729 super_class), "unary *"); 8730 } 8731 else 8732 { 8733 add_class_reference (super_name); 8734 super_class = (TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL 8735 ? objc_get_class_decl : objc_get_meta_class_decl); 8736 assemble_external (super_class); 8737 super_class 8738 = build_function_call 8739 (super_class, 8740 build_tree_list 8741 (NULL_TREE, 8742 my_build_string_pointer 8743 (IDENTIFIER_LENGTH (super_name) + 1, 8744 IDENTIFIER_POINTER (super_name)))); 8745 } 8746 8747 super_expr 8748 = build_modify_expr (super_expr, NOP_EXPR, 8749 build_c_cast (TREE_TYPE (super_expr), 8750 super_class)); 8751 } 8752 8753 super_expr_list = build_compound_expr (super_expr_list, super_expr); 8754 8755 super_expr = build_unary_op (ADDR_EXPR, UOBJC_SUPER_decl, 0); 8756 super_expr_list = build_compound_expr (super_expr_list, super_expr); 8757 8758 return super_expr_list; 8759 } 8760 else 8761 { 8762 error ("[super ...] must appear in a method context"); 8763 return error_mark_node; 8764 } 8765} 8766 8767/* When exiting a scope, sever links to a 'super' declaration (if any) 8768 therein contained. */ 8769 8770void 8771objc_clear_super_receiver (void) 8772{ 8773 if (objc_method_context 8774 && UOBJC_SUPER_scope == objc_get_current_scope ()) { 8775 UOBJC_SUPER_decl = 0; 8776 UOBJC_SUPER_scope = 0; 8777 } 8778} 8779 8780void 8781objc_finish_method_definition (tree fndecl) 8782{ 8783 /* We cannot validly inline ObjC methods, at least not without a language 8784 extension to declare that a method need not be dynamically 8785 dispatched, so suppress all thoughts of doing so. */ 8786 DECL_INLINE (fndecl) = 0; 8787 DECL_UNINLINABLE (fndecl) = 1; 8788 8789#ifndef OBJCPLUS 8790 /* The C++ front-end will have called finish_function() for us. */ 8791 finish_function (); 8792#endif 8793 8794 METHOD_ENCODING (objc_method_context) 8795 = encode_method_prototype (objc_method_context); 8796 8797 /* Required to implement _msgSuper. This must be done AFTER finish_function, 8798 since the optimizer may find "may be used before set" errors. */ 8799 objc_method_context = NULL_TREE; 8800 8801 if (should_call_super_dealloc) 8802 warning (0, "method possibly missing a [super dealloc] call"); 8803} 8804 8805#if 0 8806int 8807lang_report_error_function (tree decl) 8808{ 8809 if (objc_method_context) 8810 { 8811 fprintf (stderr, "In method %qs\n", 8812 IDENTIFIER_POINTER (METHOD_SEL_NAME (objc_method_context))); 8813 return 1; 8814 } 8815 8816 else 8817 return 0; 8818} 8819#endif 8820 8821/* Given a tree DECL node, produce a printable description of it in the given 8822 buffer, overwriting the buffer. */ 8823 8824static char * 8825gen_declaration (tree decl) 8826{ 8827 errbuf[0] = '\0'; 8828 8829 if (DECL_P (decl)) 8830 { 8831 gen_type_name_0 (TREE_TYPE (decl)); 8832 8833 if (DECL_NAME (decl)) 8834 { 8835 if (!POINTER_TYPE_P (TREE_TYPE (decl))) 8836 strcat (errbuf, " "); 8837 8838 strcat (errbuf, IDENTIFIER_POINTER (DECL_NAME (decl))); 8839 } 8840 8841 if (DECL_INITIAL (decl) 8842 && TREE_CODE (DECL_INITIAL (decl)) == INTEGER_CST) 8843 sprintf (errbuf + strlen (errbuf), ": " HOST_WIDE_INT_PRINT_DEC, 8844 TREE_INT_CST_LOW (DECL_INITIAL (decl))); 8845 } 8846 8847 return errbuf; 8848} 8849 8850/* Given a tree TYPE node, produce a printable description of it in the given 8851 buffer, overwriting the buffer. */ 8852 8853static char * 8854gen_type_name_0 (tree type) 8855{ 8856 tree orig = type, proto; 8857 8858 if (TYPE_P (type) && TYPE_NAME (type)) 8859 type = TYPE_NAME (type); 8860 else if (POINTER_TYPE_P (type) || TREE_CODE (type) == ARRAY_TYPE) 8861 { 8862 tree inner = TREE_TYPE (type); 8863 8864 while (TREE_CODE (inner) == ARRAY_TYPE) 8865 inner = TREE_TYPE (inner); 8866 8867 gen_type_name_0 (inner); 8868 8869 if (!POINTER_TYPE_P (inner)) 8870 strcat (errbuf, " "); 8871 8872 if (POINTER_TYPE_P (type)) 8873 strcat (errbuf, "*"); 8874 else 8875 while (type != inner) 8876 { 8877 strcat (errbuf, "["); 8878 8879 if (TYPE_DOMAIN (type)) 8880 { 8881 char sz[20]; 8882 8883 sprintf (sz, HOST_WIDE_INT_PRINT_DEC, 8884 (TREE_INT_CST_LOW 8885 (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) + 1)); 8886 strcat (errbuf, sz); 8887 } 8888 8889 strcat (errbuf, "]"); 8890 type = TREE_TYPE (type); 8891 } 8892 8893 goto exit_function; 8894 } 8895 8896 if (TREE_CODE (type) == TYPE_DECL && DECL_NAME (type)) 8897 type = DECL_NAME (type); 8898 8899 strcat (errbuf, TREE_CODE (type) == IDENTIFIER_NODE 8900 ? IDENTIFIER_POINTER (type) 8901 : ""); 8902 8903 /* For 'id' and 'Class', adopted protocols are stored in the pointee. */ 8904 if (objc_is_id (orig)) 8905 orig = TREE_TYPE (orig); 8906 8907 proto = TYPE_HAS_OBJC_INFO (orig) ? TYPE_OBJC_PROTOCOL_LIST (orig) : NULL_TREE; 8908 8909 if (proto) 8910 { 8911 strcat (errbuf, " <"); 8912 8913 while (proto) { 8914 strcat (errbuf, 8915 IDENTIFIER_POINTER (PROTOCOL_NAME (TREE_VALUE (proto)))); 8916 proto = TREE_CHAIN (proto); 8917 strcat (errbuf, proto ? ", " : ">"); 8918 } 8919 } 8920 8921 exit_function: 8922 return errbuf; 8923} 8924 8925static char * 8926gen_type_name (tree type) 8927{ 8928 errbuf[0] = '\0'; 8929 8930 return gen_type_name_0 (type); 8931} 8932 8933/* Given a method tree, put a printable description into the given 8934 buffer (overwriting) and return a pointer to the buffer. */ 8935 8936static char * 8937gen_method_decl (tree method) 8938{ 8939 tree chain; 8940 8941 strcpy (errbuf, "("); /* NB: Do _not_ call strcat() here. */ 8942 gen_type_name_0 (TREE_VALUE (TREE_TYPE (method))); 8943 strcat (errbuf, ")"); 8944 chain = METHOD_SEL_ARGS (method); 8945 8946 if (chain) 8947 { 8948 /* We have a chain of keyword_decls. */ 8949 do 8950 { 8951 if (KEYWORD_KEY_NAME (chain)) 8952 strcat (errbuf, IDENTIFIER_POINTER (KEYWORD_KEY_NAME (chain))); 8953 8954 strcat (errbuf, ":("); 8955 gen_type_name_0 (TREE_VALUE (TREE_TYPE (chain))); 8956 strcat (errbuf, ")"); 8957 8958 strcat (errbuf, IDENTIFIER_POINTER (KEYWORD_ARG_NAME (chain))); 8959 if ((chain = TREE_CHAIN (chain))) 8960 strcat (errbuf, " "); 8961 } 8962 while (chain); 8963 8964 if (METHOD_ADD_ARGS (method)) 8965 { 8966 chain = TREE_CHAIN (METHOD_ADD_ARGS (method)); 8967 8968 /* Know we have a chain of parm_decls. */ 8969 while (chain) 8970 { 8971 strcat (errbuf, ", "); 8972 gen_type_name_0 (TREE_TYPE (TREE_VALUE (chain))); 8973 chain = TREE_CHAIN (chain); 8974 } 8975 8976 if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) 8977 strcat (errbuf, ", ..."); 8978 } 8979 } 8980 8981 else 8982 /* We have a unary selector. */ 8983 strcat (errbuf, IDENTIFIER_POINTER (METHOD_SEL_NAME (method))); 8984 8985 return errbuf; 8986} 8987 8988/* Debug info. */ 8989 8990 8991/* Dump an @interface declaration of the supplied class CHAIN to the 8992 supplied file FP. Used to implement the -gen-decls option (which 8993 prints out an @interface declaration of all classes compiled in 8994 this run); potentially useful for debugging the compiler too. */ 8995static void 8996dump_interface (FILE *fp, tree chain) 8997{ 8998 /* FIXME: A heap overflow here whenever a method (or ivar) 8999 declaration is so long that it doesn't fit in the buffer. The 9000 code and all the related functions should be rewritten to avoid 9001 using fixed size buffers. */ 9002 const char *my_name = IDENTIFIER_POINTER (CLASS_NAME (chain)); 9003 tree ivar_decls = CLASS_RAW_IVARS (chain); 9004 tree nst_methods = CLASS_NST_METHODS (chain); 9005 tree cls_methods = CLASS_CLS_METHODS (chain); 9006 9007 fprintf (fp, "\n@interface %s", my_name); 9008 9009 /* CLASS_SUPER_NAME is used to store the superclass name for 9010 classes, and the category name for categories. */ 9011 if (CLASS_SUPER_NAME (chain)) 9012 { 9013 const char *name = IDENTIFIER_POINTER (CLASS_SUPER_NAME (chain)); 9014 9015 if (TREE_CODE (chain) == CATEGORY_IMPLEMENTATION_TYPE 9016 || TREE_CODE (chain) == CATEGORY_INTERFACE_TYPE) 9017 { 9018 fprintf (fp, " (%s)\n", name); 9019 } 9020 else 9021 { 9022 fprintf (fp, " : %s\n", name); 9023 } 9024 } 9025 else 9026 fprintf (fp, "\n"); 9027 9028 /* FIXME - the following doesn't seem to work at the moment. */ 9029 if (ivar_decls) 9030 { 9031 fprintf (fp, "{\n"); 9032 do 9033 { 9034 fprintf (fp, "\t%s;\n", gen_declaration (ivar_decls)); 9035 ivar_decls = TREE_CHAIN (ivar_decls); 9036 } 9037 while (ivar_decls); 9038 fprintf (fp, "}\n"); 9039 } 9040 9041 while (nst_methods) 9042 { 9043 fprintf (fp, "- %s;\n", gen_method_decl (nst_methods)); 9044 nst_methods = TREE_CHAIN (nst_methods); 9045 } 9046 9047 while (cls_methods) 9048 { 9049 fprintf (fp, "+ %s;\n", gen_method_decl (cls_methods)); 9050 cls_methods = TREE_CHAIN (cls_methods); 9051 } 9052 9053 fprintf (fp, "@end\n"); 9054} 9055 9056/* Demangle function for Objective-C */ 9057static const char * 9058objc_demangle (const char *mangled) 9059{ 9060 char *demangled, *cp; 9061 9062 if (mangled[0] == '_' && 9063 (mangled[1] == 'i' || mangled[1] == 'c') && 9064 mangled[2] == '_') 9065 { 9066 cp = demangled = XNEWVEC (char, strlen(mangled) + 2); 9067 if (mangled[1] == 'i') 9068 *cp++ = '-'; /* for instance method */ 9069 else 9070 *cp++ = '+'; /* for class method */ 9071 *cp++ = '['; /* opening left brace */ 9072 strcpy(cp, mangled+3); /* tack on the rest of the mangled name */ 9073 while (*cp && *cp == '_') 9074 cp++; /* skip any initial underbars in class name */ 9075 cp = strchr(cp, '_'); /* find first non-initial underbar */ 9076 if (cp == NULL) 9077 { 9078 free(demangled); /* not mangled name */ 9079 return mangled; 9080 } 9081 if (cp[1] == '_') /* easy case: no category name */ 9082 { 9083 *cp++ = ' '; /* replace two '_' with one ' ' */ 9084 strcpy(cp, mangled + (cp - demangled) + 2); 9085 } 9086 else 9087 { 9088 *cp++ = '('; /* less easy case: category name */ 9089 cp = strchr(cp, '_'); 9090 if (cp == 0) 9091 { 9092 free(demangled); /* not mangled name */ 9093 return mangled; 9094 } 9095 *cp++ = ')'; 9096 *cp++ = ' '; /* overwriting 1st char of method name... */ 9097 strcpy(cp, mangled + (cp - demangled)); /* get it back */ 9098 } 9099 while (*cp && *cp == '_') 9100 cp++; /* skip any initial underbars in method name */ 9101 for (; *cp; cp++) 9102 if (*cp == '_') 9103 *cp = ':'; /* replace remaining '_' with ':' */ 9104 *cp++ = ']'; /* closing right brace */ 9105 *cp++ = 0; /* string terminator */ 9106 return demangled; 9107 } 9108 else 9109 return mangled; /* not an objc mangled name */ 9110} 9111 9112const char * 9113objc_printable_name (tree decl, int kind ATTRIBUTE_UNUSED) 9114{ 9115 return objc_demangle (IDENTIFIER_POINTER (DECL_NAME (decl))); 9116} 9117 9118static void 9119init_objc (void) 9120{ 9121 gcc_obstack_init (&util_obstack); 9122 util_firstobj = (char *) obstack_finish (&util_obstack); 9123 9124 errbuf = XNEWVEC (char, 1024 * 10); 9125 hash_init (); 9126 synth_module_prologue (); 9127} 9128 9129static void 9130finish_objc (void) 9131{ 9132 struct imp_entry *impent; 9133 tree chain; 9134 /* The internally generated initializers appear to have missing braces. 9135 Don't warn about this. */ 9136 int save_warn_missing_braces = warn_missing_braces; 9137 warn_missing_braces = 0; 9138 9139 /* A missing @end may not be detected by the parser. */ 9140 if (objc_implementation_context) 9141 { 9142 warning (0, "%<@end%> missing in implementation context"); 9143 finish_class (objc_implementation_context); 9144 objc_ivar_chain = NULL_TREE; 9145 objc_implementation_context = NULL_TREE; 9146 } 9147 9148 /* Process the static instances here because initialization of objc_symtab 9149 depends on them. */ 9150 if (objc_static_instances) 9151 generate_static_references (); 9152 9153 if (imp_list || class_names_chain 9154 || meth_var_names_chain || meth_var_types_chain || sel_ref_chain) 9155 generate_objc_symtab_decl (); 9156 9157 for (impent = imp_list; impent; impent = impent->next) 9158 { 9159 objc_implementation_context = impent->imp_context; 9160 implementation_template = impent->imp_template; 9161 9162 UOBJC_CLASS_decl = impent->class_decl; 9163 UOBJC_METACLASS_decl = impent->meta_decl; 9164 9165 /* Dump the @interface of each class as we compile it, if the 9166 -gen-decls option is in use. TODO: Dump the classes in the 9167 order they were found, rather than in reverse order as we 9168 are doing now. */ 9169 if (flag_gen_declaration) 9170 { 9171 dump_interface (gen_declaration_file, objc_implementation_context); 9172 } 9173 9174 if (TREE_CODE (objc_implementation_context) == CLASS_IMPLEMENTATION_TYPE) 9175 { 9176 /* all of the following reference the string pool... */ 9177 generate_ivar_lists (); 9178 generate_dispatch_tables (); 9179 generate_shared_structures (impent->has_cxx_cdtors 9180 ? CLS_HAS_CXX_STRUCTORS 9181 : 0); 9182 } 9183 else 9184 { 9185 generate_dispatch_tables (); 9186 generate_category (objc_implementation_context); 9187 } 9188 } 9189 9190 /* If we are using an array of selectors, we must always 9191 finish up the array decl even if no selectors were used. */ 9192 if (! flag_next_runtime || sel_ref_chain) 9193 build_selector_translation_table (); 9194 9195 if (protocol_chain) 9196 generate_protocols (); 9197 9198 if ((flag_replace_objc_classes && imp_list) || flag_objc_gc) 9199 generate_objc_image_info (); 9200 9201 /* Arrange for ObjC data structures to be initialized at run time. */ 9202 if (objc_implementation_context || class_names_chain || objc_static_instances 9203 || meth_var_names_chain || meth_var_types_chain || sel_ref_chain) 9204 { 9205 build_module_descriptor (); 9206 9207 if (!flag_next_runtime) 9208 build_module_initializer_routine (); 9209 } 9210 9211 /* Dump the class references. This forces the appropriate classes 9212 to be linked into the executable image, preserving unix archive 9213 semantics. This can be removed when we move to a more dynamically 9214 linked environment. */ 9215 9216 for (chain = cls_ref_chain; chain; chain = TREE_CHAIN (chain)) 9217 { 9218 handle_class_ref (chain); 9219 if (TREE_PURPOSE (chain)) 9220 generate_classref_translation_entry (chain); 9221 } 9222 9223 for (impent = imp_list; impent; impent = impent->next) 9224 handle_impent (impent); 9225 9226 if (warn_selector) 9227 { 9228 int slot; 9229 hash hsh; 9230 9231 /* Run through the selector hash tables and print a warning for any 9232 selector which has multiple methods. */ 9233 9234 for (slot = 0; slot < SIZEHASHTABLE; slot++) 9235 { 9236 for (hsh = cls_method_hash_list[slot]; hsh; hsh = hsh->next) 9237 check_duplicates (hsh, 0, 1); 9238 for (hsh = nst_method_hash_list[slot]; hsh; hsh = hsh->next) 9239 check_duplicates (hsh, 0, 1); 9240 } 9241 } 9242 9243 warn_missing_braces = save_warn_missing_braces; 9244} 9245 9246/* Subroutines of finish_objc. */ 9247 9248static void 9249generate_classref_translation_entry (tree chain) 9250{ 9251 tree expr, decl, type; 9252 9253 decl = TREE_PURPOSE (chain); 9254 type = TREE_TYPE (decl); 9255 9256 expr = add_objc_string (TREE_VALUE (chain), class_names); 9257 expr = convert (type, expr); /* cast! */ 9258 9259 /* The decl that is the one that we 9260 forward declared in build_class_reference. */ 9261 finish_var_decl (decl, expr); 9262 return; 9263} 9264 9265static void 9266handle_class_ref (tree chain) 9267{ 9268 const char *name = IDENTIFIER_POINTER (TREE_VALUE (chain)); 9269 char *string = (char *) alloca (strlen (name) + 30); 9270 tree decl; 9271 tree exp; 9272 9273 sprintf (string, "%sobjc_class_name_%s", 9274 (flag_next_runtime ? "." : "__"), name); 9275 9276#ifdef ASM_DECLARE_UNRESOLVED_REFERENCE 9277 if (flag_next_runtime) 9278 { 9279 ASM_DECLARE_UNRESOLVED_REFERENCE (asm_out_file, string); 9280 return; 9281 } 9282#endif 9283 9284 /* Make a decl for this name, so we can use its address in a tree. */ 9285 decl = build_decl (VAR_DECL, get_identifier (string), char_type_node); 9286 DECL_EXTERNAL (decl) = 1; 9287 TREE_PUBLIC (decl) = 1; 9288 9289 pushdecl (decl); 9290 rest_of_decl_compilation (decl, 0, 0); 9291 9292 /* Make a decl for the address. */ 9293 sprintf (string, "%sobjc_class_ref_%s", 9294 (flag_next_runtime ? "." : "__"), name); 9295 exp = build1 (ADDR_EXPR, string_type_node, decl); 9296 decl = build_decl (VAR_DECL, get_identifier (string), string_type_node); 9297 DECL_INITIAL (decl) = exp; 9298 TREE_STATIC (decl) = 1; 9299 TREE_USED (decl) = 1; 9300 /* Force the output of the decl as this forces the reference of the class. */ 9301 mark_decl_referenced (decl); 9302 9303 pushdecl (decl); 9304 rest_of_decl_compilation (decl, 0, 0); 9305} 9306 9307static void 9308handle_impent (struct imp_entry *impent) 9309{ 9310 char *string; 9311 9312 objc_implementation_context = impent->imp_context; 9313 implementation_template = impent->imp_template; 9314 9315 if (TREE_CODE (impent->imp_context) == CLASS_IMPLEMENTATION_TYPE) 9316 { 9317 const char *const class_name = 9318 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context)); 9319 9320 string = (char *) alloca (strlen (class_name) + 30); 9321 9322 sprintf (string, "%sobjc_class_name_%s", 9323 (flag_next_runtime ? "." : "__"), class_name); 9324 } 9325 else if (TREE_CODE (impent->imp_context) == CATEGORY_IMPLEMENTATION_TYPE) 9326 { 9327 const char *const class_name = 9328 IDENTIFIER_POINTER (CLASS_NAME (impent->imp_context)); 9329 const char *const class_super_name = 9330 IDENTIFIER_POINTER (CLASS_SUPER_NAME (impent->imp_context)); 9331 9332 string = (char *) alloca (strlen (class_name) 9333 + strlen (class_super_name) + 30); 9334 9335 /* Do the same for categories. Even though no references to 9336 these symbols are generated automatically by the compiler, it 9337 gives you a handle to pull them into an archive by hand. */ 9338 sprintf (string, "*%sobjc_category_name_%s_%s", 9339 (flag_next_runtime ? "." : "__"), class_name, class_super_name); 9340 } 9341 else 9342 return; 9343 9344#ifdef ASM_DECLARE_CLASS_REFERENCE 9345 if (flag_next_runtime) 9346 { 9347 ASM_DECLARE_CLASS_REFERENCE (asm_out_file, string); 9348 return; 9349 } 9350 else 9351#endif 9352 { 9353 tree decl, init; 9354 9355 init = build_int_cst (c_common_type_for_size (BITS_PER_WORD, 1), 0); 9356 decl = build_decl (VAR_DECL, get_identifier (string), TREE_TYPE (init)); 9357 TREE_PUBLIC (decl) = 1; 9358 TREE_READONLY (decl) = 1; 9359 TREE_USED (decl) = 1; 9360 TREE_CONSTANT (decl) = 1; 9361 DECL_CONTEXT (decl) = 0; 9362 DECL_ARTIFICIAL (decl) = 1; 9363 DECL_INITIAL (decl) = init; 9364 assemble_variable (decl, 1, 0, 0); 9365 } 9366} 9367 9368/* The Fix-and-Continue functionality available in Mac OS X 10.3 and 9369 later requires that ObjC translation units participating in F&C be 9370 specially marked. The following routine accomplishes this. */ 9371 9372/* static int _OBJC_IMAGE_INFO[2] = { 0, 1 }; */ 9373 9374static void 9375generate_objc_image_info (void) 9376{ 9377 tree decl, initlist; 9378 int flags 9379 = ((flag_replace_objc_classes && imp_list ? 1 : 0) 9380 | (flag_objc_gc ? 2 : 0)); 9381 9382 decl = start_var_decl (build_array_type 9383 (integer_type_node, 9384 build_index_type (build_int_cst (NULL_TREE, 2 - 1))), 9385 "_OBJC_IMAGE_INFO"); 9386 9387 initlist = build_tree_list (NULL_TREE, build_int_cst (NULL_TREE, 0)); 9388 initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, flags), initlist); 9389 initlist = objc_build_constructor (TREE_TYPE (decl), nreverse (initlist)); 9390 9391 finish_var_decl (decl, initlist); 9392} 9393 9394/* Look up ID as an instance variable. OTHER contains the result of 9395 the C or C++ lookup, which we may want to use instead. */ 9396 9397tree 9398objc_lookup_ivar (tree other, tree id) 9399{ 9400 tree ivar; 9401 9402 /* If we are not inside of an ObjC method, ivar lookup makes no sense. */ 9403 if (!objc_method_context) 9404 return other; 9405 9406 if (!strcmp (IDENTIFIER_POINTER (id), "super")) 9407 /* We have a message to super. */ 9408 return get_super_receiver (); 9409 9410 /* In a class method, look up an instance variable only as a last 9411 resort. */ 9412 if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL 9413 && other && other != error_mark_node) 9414 return other; 9415 9416 /* Look up the ivar, but do not use it if it is not accessible. */ 9417 ivar = is_ivar (objc_ivar_chain, id); 9418 9419 if (!ivar || is_private (ivar)) 9420 return other; 9421 9422 /* In an instance method, a local variable (or parameter) may hide the 9423 instance variable. */ 9424 if (TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL 9425 && other && other != error_mark_node 9426#ifdef OBJCPLUS 9427 && CP_DECL_CONTEXT (other) != global_namespace) 9428#else 9429 && !DECL_FILE_SCOPE_P (other)) 9430#endif 9431 { 9432 warning (0, "local declaration of %qs hides instance variable", 9433 IDENTIFIER_POINTER (id)); 9434 9435 return other; 9436 } 9437 9438 /* At this point, we are either in an instance method with no obscuring 9439 local definitions, or in a class method with no alternate definitions 9440 at all. */ 9441 return build_ivar_reference (id); 9442} 9443 9444/* Possibly rewrite a function CALL into an OBJ_TYPE_REF expression. This 9445 needs to be done if we are calling a function through a cast. */ 9446 9447tree 9448objc_rewrite_function_call (tree function, tree params) 9449{ 9450 if (TREE_CODE (function) == NOP_EXPR 9451 && TREE_CODE (TREE_OPERAND (function, 0)) == ADDR_EXPR 9452 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (function, 0), 0)) 9453 == FUNCTION_DECL) 9454 { 9455 function = build3 (OBJ_TYPE_REF, TREE_TYPE (function), 9456 TREE_OPERAND (function, 0), 9457 TREE_VALUE (params), size_zero_node); 9458 } 9459 9460 return function; 9461} 9462 9463/* Look for the special case of OBJC_TYPE_REF with the address of 9464 a function in OBJ_TYPE_REF_EXPR (presumably objc_msgSend or one 9465 of its cousins). */ 9466 9467enum gimplify_status 9468objc_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p) 9469{ 9470 enum gimplify_status r0, r1; 9471 if (TREE_CODE (*expr_p) == OBJ_TYPE_REF 9472 && TREE_CODE (OBJ_TYPE_REF_EXPR (*expr_p)) == ADDR_EXPR 9473 && TREE_CODE (TREE_OPERAND (OBJ_TYPE_REF_EXPR (*expr_p), 0)) 9474 == FUNCTION_DECL) 9475 { 9476 /* Postincrements in OBJ_TYPE_REF_OBJECT don't affect the 9477 value of the OBJ_TYPE_REF, so force them to be emitted 9478 during subexpression evaluation rather than after the 9479 OBJ_TYPE_REF. This permits objc_msgSend calls in Objective 9480 C to use direct rather than indirect calls when the 9481 object expression has a postincrement. */ 9482 r0 = gimplify_expr (&OBJ_TYPE_REF_OBJECT (*expr_p), pre_p, NULL, 9483 is_gimple_val, fb_rvalue); 9484 r1 = gimplify_expr (&OBJ_TYPE_REF_EXPR (*expr_p), pre_p, post_p, 9485 is_gimple_val, fb_rvalue); 9486 9487 return MIN (r0, r1); 9488 } 9489 9490#ifdef OBJCPLUS 9491 return cp_gimplify_expr (expr_p, pre_p, post_p); 9492#else 9493 return c_gimplify_expr (expr_p, pre_p, post_p); 9494#endif 9495} 9496 9497/* Given a CALL expression, find the function being called. The ObjC 9498 version looks for the OBJ_TYPE_REF_EXPR which is used for objc_msgSend. */ 9499 9500tree 9501objc_get_callee_fndecl (tree call_expr) 9502{ 9503 tree addr = TREE_OPERAND (call_expr, 0); 9504 if (TREE_CODE (addr) != OBJ_TYPE_REF) 9505 return 0; 9506 9507 addr = OBJ_TYPE_REF_EXPR (addr); 9508 9509 /* If the address is just `&f' for some function `f', then we know 9510 that `f' is being called. */ 9511 if (TREE_CODE (addr) == ADDR_EXPR 9512 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL) 9513 return TREE_OPERAND (addr, 0); 9514 9515 return 0; 9516} 9517 9518#include "gt-objc-objc-act.h" 9519