| /* Implement classes and message passing for Objective C. |
| Copyright (C) 1992-2022 Free Software Foundation, Inc. |
| Contributed by Steve Naroff. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "tree.h" |
| #include "stringpool.h" |
| #include "stor-layout.h" |
| #include "attribs.h" |
| |
| #ifdef OBJCPLUS |
| #include "cp/cp-tree.h" |
| #else |
| #include "c/c-tree.h" |
| #include "c/c-lang.h" |
| #endif |
| |
| #include "c-family/c-objc.h" |
| #include "langhooks.h" |
| #include "objc-act.h" |
| #include "objc-map.h" |
| #include "function.h" |
| #include "toplev.h" |
| #include "debug.h" |
| #include "c-family/c-target.h" |
| #include "intl.h" |
| #include "cgraph.h" |
| #include "tree-iterator.h" |
| /* Different initialization, code gen and meta data generation for each |
| runtime. */ |
| #include "objc-runtime-hooks.h" |
| /* Routines used mainly by the runtimes. */ |
| #include "objc-runtime-shared-support.h" |
| /* For default_tree_printer (). */ |
| |
| /* For enum gimplify_status */ |
| #include "gimple-expr.h" |
| #include "gimplify.h" |
| |
| /* For encode_method_prototype(). */ |
| #include "objc-encoding.h" |
| |
| static unsigned int should_call_super_dealloc = 0; |
| |
| /* When building Objective-C++, we are not linking against the C front-end |
| and so need to replicate the C tree-construction functions in some way. */ |
| #ifdef OBJCPLUS |
| #define OBJCP_REMAP_FUNCTIONS |
| #include "objcp-decl.h" |
| #endif /* OBJCPLUS */ |
| |
| /* This is the default way of generating a method name. */ |
| /* This has the problem that "test_method:argument:" and |
| "test:method_argument:" will generate the same name |
| ("_i_Test__test_method_argument_" for an instance method of the |
| class "Test"), so you can't have them both in the same class! |
| Moreover, the demangling (going from |
| "_i_Test__test_method_argument" back to the original name) is |
| undefined because there are two correct ways of demangling the |
| name. */ |
| #ifndef OBJC_GEN_METHOD_LABEL |
| #define OBJC_GEN_METHOD_LABEL(BUF, IS_INST, CLASS_NAME, CAT_NAME, SEL_NAME, NUM) \ |
| do { \ |
| char *temp; \ |
| sprintf ((BUF), "_%s_%s_%s_%s", \ |
| ((IS_INST) ? "i" : "c"), \ |
| (CLASS_NAME), \ |
| ((CAT_NAME)? (CAT_NAME) : ""), \ |
| (SEL_NAME)); \ |
| for (temp = (BUF); *temp; temp++) \ |
| if (*temp == ':') *temp = '_'; \ |
| } while (0) |
| #endif |
| |
| /* These need specifying. */ |
| #ifndef OBJC_FORWARDING_STACK_OFFSET |
| #define OBJC_FORWARDING_STACK_OFFSET 0 |
| #endif |
| |
| #ifndef OBJC_FORWARDING_MIN_OFFSET |
| #define OBJC_FORWARDING_MIN_OFFSET 0 |
| #endif |
| |
| /*** Private Interface (procedures) ***/ |
| |
| /* Init stuff. */ |
| static void synth_module_prologue (void); |
| |
| /* Code generation. */ |
| |
| static tree start_class (enum tree_code, tree, tree, tree, tree); |
| static tree continue_class (tree); |
| static void finish_class (tree); |
| static void start_method_def (tree, tree); |
| |
| static tree start_protocol (enum tree_code, tree, tree, tree); |
| static tree build_method_decl (enum tree_code, tree, tree, tree, bool); |
| static tree objc_add_method (tree, tree, int, bool); |
| static tree add_instance_variable (tree, objc_ivar_visibility_kind, tree); |
| static tree build_ivar_reference (tree); |
| static tree is_ivar (tree, tree); |
| |
| /* We only need the following for ObjC; ObjC++ will use C++'s definition |
| of DERIVED_FROM_P. */ |
| #ifndef OBJCPLUS |
| static bool objc_derived_from_p (tree, tree); |
| #define DERIVED_FROM_P(PARENT, CHILD) objc_derived_from_p (PARENT, CHILD) |
| #endif |
| |
| /* Property. */ |
| static void objc_gen_property_data (tree, tree); |
| static void objc_synthesize_getter (tree, tree, tree); |
| static void objc_synthesize_setter (tree, tree, tree); |
| static tree lookup_property (tree, tree); |
| static tree lookup_property_in_list (tree, tree); |
| static tree lookup_property_in_protocol_list (tree, tree); |
| static void build_common_objc_property_accessor_helpers (void); |
| |
| static void objc_xref_basetypes (tree, tree); |
| |
| static tree get_class_ivars (tree, bool); |
| |
| static void build_fast_enumeration_state_template (void); |
| |
| #ifdef OBJCPLUS |
| static void objc_generate_cxx_cdtors (void); |
| #endif |
| |
| /* objc attribute */ |
| static void objc_decl_method_attributes (tree*, tree, int); |
| static tree build_keyword_selector (tree); |
| |
| static void hash_init (void); |
| |
| /* Hash tables to manage the global pool of method prototypes. Each |
| of these maps map a method name (selector) identifier to either a |
| single tree (for methods with a single method prototype) or a |
| TREE_VEC (for methods with multiple method prototypes). */ |
| static GTY(()) objc_map_t instance_method_map = 0; |
| static GTY(()) objc_map_t class_method_map = 0; |
| |
| /* Hash tables to manage the global pool of class names. */ |
| |
| static GTY(()) objc_map_t class_name_map = 0; |
| static GTY(()) objc_map_t alias_name_map = 0; |
| |
| static tree lookup_method (tree, tree); |
| static tree lookup_method_static (tree, tree, int); |
| |
| static void interface_hash_init (void); |
| static tree add_interface (tree, tree); |
| static void add_category (tree, tree); |
| static inline tree lookup_category (tree, tree); |
| |
| /* Protocols. */ |
| |
| static tree lookup_protocol (tree, bool, bool); |
| static tree lookup_and_install_protocols (tree, bool); |
| |
| #ifdef OBJCPLUS |
| static void really_start_method (tree, tree); |
| #else |
| static void really_start_method (tree, struct c_arg_info *); |
| #endif |
| static int comp_proto_with_proto (tree, tree, int); |
| static tree objc_decay_parm_type (tree); |
| |
| /* Utilities for debugging and error diagnostics. */ |
| |
| static char *gen_type_name (tree); |
| static char *gen_type_name_0 (tree); |
| static char *gen_method_decl (tree); |
| static char *gen_declaration (tree); |
| |
| /* Everything else. */ |
| |
| static void generate_struct_by_value_array (void) ATTRIBUTE_NORETURN; |
| |
| static void mark_referenced_methods (void); |
| static bool objc_type_valid_for_messaging (tree type, bool allow_classes); |
| static tree check_duplicates (tree, int, int); |
| |
| /*** Private Interface (data) ***/ |
| /* Flags for lookup_method_static(). */ |
| |
| /* Look for class methods. */ |
| #define OBJC_LOOKUP_CLASS 1 |
| /* Do not examine superclasses. */ |
| #define OBJC_LOOKUP_NO_SUPER 2 |
| /* Disable returning an instance method of a root class when a class |
| method can't be found. */ |
| #define OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS 4 |
| |
| /* The OCTI_... enumeration itself is in objc/objc-act.h. */ |
| tree objc_global_trees[OCTI_MAX]; |
| |
| struct imp_entry *imp_list = 0; |
| int imp_count = 0; /* `@implementation' */ |
| int cat_count = 0; /* `@category' */ |
| |
| objc_ivar_visibility_kind objc_ivar_visibility, objc_default_ivar_visibility; |
| |
| /* Use to generate method labels. */ |
| static int method_slot = 0; |
| |
| /* Flag to say whether methods in a protocol are optional or |
| required. */ |
| static bool objc_method_optional_flag = false; |
| |
| static int objc_collecting_ivars = 0; |
| |
| /* Flag that is set to 'true' while we are processing a class |
| extension. Since a class extension just "reopens" the main |
| @interface, this can be used to determine if we are in the main |
| @interface, or in a class extension. */ |
| static bool objc_in_class_extension = false; |
| |
| static char *errbuf; /* Buffer for error diagnostics */ |
| |
| /* An array of all the local variables in the current function that |
| need to be marked as volatile. */ |
| vec<tree, va_gc> *local_variables_to_volatilize = NULL; |
| |
| /* Store all constructed constant strings in a hash table so that |
| they get uniqued properly. */ |
| |
| struct GTY((for_user)) string_descriptor { |
| /* The literal argument . */ |
| tree literal; |
| |
| /* The resulting constant string. */ |
| tree constructor; |
| }; |
| |
| struct objc_string_hasher : ggc_ptr_hash<string_descriptor> |
| { |
| static hashval_t hash (string_descriptor *); |
| static bool equal (string_descriptor *, string_descriptor *); |
| }; |
| |
| static GTY(()) hash_table<objc_string_hasher> *string_htab; |
| |
| FILE *gen_declaration_file; |
| |
| /* Hooks for stuff that differs between runtimes. */ |
| objc_runtime_hooks runtime; |
| |
| /* Create a temporary variable of type 'type'. If 'name' is set, uses |
| the specified name, else use no name. Returns the declaration of |
| the type. The 'name' is mostly useful for debugging. |
| */ |
| tree |
| objc_create_temporary_var (tree type, const char *name) |
| { |
| tree decl; |
| |
| if (name != NULL) |
| { |
| decl = build_decl (input_location, |
| VAR_DECL, get_identifier (name), type); |
| } |
| else |
| { |
| decl = build_decl (input_location, |
| VAR_DECL, NULL_TREE, type); |
| } |
| TREE_USED (decl) = 1; |
| DECL_ARTIFICIAL (decl) = 1; |
| DECL_IGNORED_P (decl) = 1; |
| DECL_CONTEXT (decl) = current_function_decl; |
| |
| return decl; |
| } |
| |
| /* Some platforms pass small structures through registers versus |
| through an invisible pointer. Determine at what size structure is |
| the transition point between the two possibilities. */ |
| |
| static void |
| generate_struct_by_value_array (void) |
| { |
| tree type; |
| tree decls; |
| int i, j; |
| int aggregate_in_mem[32]; |
| int found = 0; |
| |
| /* Presumably no platform passes 32 byte structures in a register. */ |
| /* ??? As an example, m64/ppc/Darwin can pass up to 8*long+13*double |
| in registers. */ |
| for (i = 1; i < 32; i++) |
| { |
| char buffer[5]; |
| tree *chain = NULL; |
| |
| /* Create an unnamed struct that has `i' character components */ |
| type = objc_start_struct (NULL_TREE); |
| |
| strcpy (buffer, "c1"); |
| decls = add_field_decl (char_type_node, buffer, &chain); |
| |
| for (j = 1; j < i; j++) |
| { |
| sprintf (buffer, "c%d", j + 1); |
| add_field_decl (char_type_node, buffer, &chain); |
| } |
| objc_finish_struct (type, decls); |
| |
| aggregate_in_mem[i] = aggregate_value_p (type, 0); |
| if (!aggregate_in_mem[i]) |
| found = 1; |
| } |
| |
| /* We found some structures that are returned in registers instead of memory |
| so output the necessary data. */ |
| if (found) |
| { |
| for (i = 31; i >= 0; i--) |
| if (!aggregate_in_mem[i]) |
| break; |
| printf ("#define OBJC_MAX_STRUCT_BY_VALUE %d\n", i); |
| } |
| |
| exit (0); |
| } |
| |
| bool |
| objc_init (void) |
| { |
| bool ok; |
| #ifdef OBJCPLUS |
| if (cxx_init () == false) |
| #else |
| if (c_objc_common_init () == false) |
| #endif |
| return false; |
| |
| /* print_struct_values is triggered by -print-runtime-info (used |
| when building libobjc, with an empty file as input). It does not |
| require any ObjC setup, and it never returns. |
| |
| -fcompare-debug is used to check the compiler output; we are |
| executed twice, once with flag_compare_debug set, and once with |
| it not set. If the flag is used together with |
| -print-runtime-info, we want to print the runtime info only once, |
| else it would be output in duplicate. So we check |
| flag_compare_debug to output it in only one of the invocations. |
| |
| As a side effect, this also that means -fcompare-debug |
| -print-runtime-info will run the compiler twice, and compare the |
| generated assembler file; the first time the compiler exits |
| immediately (producing no file), and the second time it compiles |
| an empty file. This checks, as a side effect, that compiling an |
| empty file produces no assembler output. */ |
| if (print_struct_values && !flag_compare_debug) |
| generate_struct_by_value_array (); |
| |
| /* Set up stuff used by FE parser and all runtimes. */ |
| errbuf = XNEWVEC (char, 1024 * 10); |
| interface_hash_init (); |
| hash_init (); |
| objc_encoding_init (); |
| /* ... and then check flags and set-up for the selected runtime ... */ |
| if (flag_next_runtime && flag_objc_abi >= 2) |
| ok = objc_next_runtime_abi_02_init (&runtime); |
| else if (flag_next_runtime) |
| ok = objc_next_runtime_abi_01_init (&runtime); |
| else |
| ok = objc_gnu_runtime_abi_01_init (&runtime); |
| |
| /* If that part of the setup failed - bail out immediately. */ |
| if (!ok) |
| return false; |
| |
| /* Determine the default visibility for instance variables. */ |
| switch (default_ivar_visibility) |
| { |
| case IVAR_VISIBILITY_PRIVATE: |
| objc_default_ivar_visibility = OBJC_IVAR_VIS_PRIVATE; |
| break; |
| case IVAR_VISIBILITY_PUBLIC: |
| objc_default_ivar_visibility = OBJC_IVAR_VIS_PUBLIC; |
| break; |
| case IVAR_VISIBILITY_PACKAGE: |
| objc_default_ivar_visibility = OBJC_IVAR_VIS_PACKAGE; |
| break; |
| default: |
| objc_default_ivar_visibility = OBJC_IVAR_VIS_PROTECTED; |
| } |
| |
| /* Generate general types and push runtime-specific decls to file scope. */ |
| synth_module_prologue (); |
| |
| return true; |
| } |
| |
| /* This is called at the end of parsing by the C/C++ parsers. */ |
| void |
| objc_write_global_declarations (void) |
| { |
| mark_referenced_methods (); |
| |
| /* A missing @end might not be detected by the parser. */ |
| if (objc_implementation_context) |
| { |
| warning (0, "%<@end%> missing in implementation context"); |
| finish_class (objc_implementation_context); |
| objc_ivar_chain = NULL_TREE; |
| objc_implementation_context = NULL_TREE; |
| } |
| |
| if (warn_selector) |
| { |
| objc_map_iterator_t i; |
| |
| objc_map_iterator_initialize (class_method_map, &i); |
| while (objc_map_iterator_move_to_next (class_method_map, &i)) |
| check_duplicates (objc_map_iterator_current_value (class_method_map, i), 0, 1); |
| |
| objc_map_iterator_initialize (instance_method_map, &i); |
| while (objc_map_iterator_move_to_next (instance_method_map, &i)) |
| check_duplicates (objc_map_iterator_current_value (instance_method_map, i), 0, 0); |
| } |
| |
| /* TODO: consider an early exit here if either errorcount or sorrycount |
| is non-zero. Not only is it wasting time to generate the metadata, |
| it needlessly imposes need to re-check for things that are already |
| determined to be errors. */ |
| |
| /* Finalize Objective-C runtime data. No need to generate tables |
| and code if only checking syntax, or if generating a PCH file. */ |
| if (!flag_syntax_only && !pch_file) |
| { |
| location_t saved_location; |
| |
| /* If gen_declaration desired, open the output file. */ |
| if (flag_gen_declaration) |
| { |
| char * const dumpname = concat (dump_base_name, ".decl", NULL); |
| gen_declaration_file = fopen (dumpname, "w"); |
| if (gen_declaration_file == 0) |
| fatal_error (input_location, "cannot open %s: %m", dumpname); |
| free (dumpname); |
| } |
| |
| /* Set the input location to BUILTINS_LOCATION. This is good |
| for error messages, in case any is generated while producing |
| the metadata, but it also silences warnings that would be |
| produced when compiling with -Wpadded in case when padding is |
| automatically added to the built-in runtime data structure |
| declarations. We know about this padding, and it is fine; we |
| don't want users to see any warnings about it if they use |
| -Wpadded. */ |
| saved_location = input_location; |
| input_location = BUILTINS_LOCATION; |
| |
| /* Compute and emit the meta-data tables for this runtime. */ |
| (*runtime.generate_metadata) (); |
| |
| /* Restore the original location, just in case it mattered. */ |
| input_location = saved_location; |
| |
| /* ... and then close any declaration file we opened. */ |
| if (gen_declaration_file) |
| fclose (gen_declaration_file); |
| } |
| } |
| |
| /* Return the first occurrence of a method declaration corresponding |
| to sel_name in rproto_list. Search rproto_list recursively. |
| If is_class is 0, search for instance methods, otherwise for class |
| methods. */ |
| static tree |
| lookup_method_in_protocol_list (tree rproto_list, tree sel_name, |
| int is_class) |
| { |
| tree rproto, p, m; |
| |
| for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) |
| { |
| p = TREE_VALUE (rproto); |
| m = NULL_TREE; |
| |
| if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) |
| { |
| /* First, search the @required protocol methods. */ |
| if (is_class) |
| m = lookup_method (PROTOCOL_CLS_METHODS (p), sel_name); |
| else |
| m = lookup_method (PROTOCOL_NST_METHODS (p), sel_name); |
| |
| if (m) |
| return m; |
| |
| /* If still not found, search the @optional protocol methods. */ |
| if (is_class) |
| m = lookup_method (PROTOCOL_OPTIONAL_CLS_METHODS (p), sel_name); |
| else |
| m = lookup_method (PROTOCOL_OPTIONAL_NST_METHODS (p), sel_name); |
| |
| if (m) |
| return m; |
| |
| /* If still not found, search the attached protocols. */ |
| if (PROTOCOL_LIST (p)) |
| m = lookup_method_in_protocol_list (PROTOCOL_LIST (p), |
| sel_name, is_class); |
| if (m) |
| return m; |
| } |
| else |
| { |
| ; /* An identifier...if we could not find a protocol. */ |
| } |
| } |
| |
| return 0; |
| } |
| |
| static tree |
| lookup_protocol_in_reflist (tree rproto_list, tree lproto) |
| { |
| tree rproto, p; |
| |
| /* Make sure the protocol is supported by the object on the rhs. */ |
| if (TREE_CODE (lproto) == PROTOCOL_INTERFACE_TYPE) |
| { |
| tree fnd = 0; |
| for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) |
| { |
| p = TREE_VALUE (rproto); |
| |
| if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) |
| { |
| if (lproto == p) |
| fnd = lproto; |
| |
| else if (PROTOCOL_LIST (p)) |
| fnd = lookup_protocol_in_reflist (PROTOCOL_LIST (p), lproto); |
| } |
| |
| if (fnd) |
| return fnd; |
| } |
| } |
| else |
| { |
| ; /* An identifier...if we could not find a protocol. */ |
| } |
| |
| return 0; |
| } |
| |
| void |
| objc_start_class_interface (tree klass, location_t name_loc, tree super_class, |
| tree protos, tree attributes) |
| { |
| if (flag_objc1_only && attributes) |
| error_at (name_loc, "class attributes are not available in Objective-C 1.0"); |
| |
| objc_interface_context |
| = objc_ivar_context |
| = start_class (CLASS_INTERFACE_TYPE, klass, super_class, protos, attributes); |
| objc_ivar_visibility = objc_default_ivar_visibility; |
| } |
| |
| void |
| objc_start_category_interface (tree klass, tree categ, |
| tree protos, tree attributes) |
| { |
| if (attributes) |
| { |
| if (flag_objc1_only) |
| error_at (input_location, "category attributes are not available in Objective-C 1.0"); |
| else |
| warning_at (input_location, OPT_Wattributes, |
| "category attributes are not available in this version" |
| " of the compiler, (ignored)"); |
| } |
| if (categ == NULL_TREE) |
| { |
| if (flag_objc1_only) |
| error_at (input_location, "class extensions are not available in Objective-C 1.0"); |
| else |
| { |
| /* Iterate over all the classes and categories implemented |
| up to now in this compilation unit. */ |
| struct imp_entry *t; |
| |
| for (t = imp_list; t; t = t->next) |
| { |
| /* If we find a class @implementation with the same name |
| as the one we are extending, produce an error. */ |
| if (TREE_CODE (t->imp_context) == CLASS_IMPLEMENTATION_TYPE |
| && IDENTIFIER_POINTER (CLASS_NAME (t->imp_context)) == IDENTIFIER_POINTER (klass)) |
| error_at (input_location, |
| "class extension for class %qE declared after its %<@implementation%>", |
| klass); |
| } |
| } |
| } |
| objc_interface_context |
| = start_class (CATEGORY_INTERFACE_TYPE, klass, categ, protos, NULL_TREE); |
| objc_ivar_chain |
| = continue_class (objc_interface_context); |
| } |
| |
| void |
| objc_start_protocol (tree name, tree protos, tree attributes) |
| { |
| if (flag_objc1_only && attributes) |
| error_at (input_location, "protocol attributes are not available in Objective-C 1.0"); |
| |
| objc_interface_context |
| = start_protocol (PROTOCOL_INTERFACE_TYPE, name, protos, attributes); |
| objc_method_optional_flag = false; |
| } |
| |
| void |
| objc_continue_interface (void) |
| { |
| objc_ivar_chain |
| = continue_class (objc_interface_context); |
| } |
| |
| void |
| objc_finish_interface (void) |
| { |
| finish_class (objc_interface_context); |
| objc_interface_context = NULL_TREE; |
| objc_method_optional_flag = false; |
| objc_in_class_extension = false; |
| } |
| |
| void |
| objc_start_class_implementation (tree klass, tree super_class) |
| { |
| objc_implementation_context |
| = objc_ivar_context |
| = start_class (CLASS_IMPLEMENTATION_TYPE, klass, super_class, NULL_TREE, |
| NULL_TREE); |
| objc_ivar_visibility = objc_default_ivar_visibility; |
| } |
| |
| void |
| objc_start_category_implementation (tree klass, tree categ) |
| { |
| objc_implementation_context |
| = start_class (CATEGORY_IMPLEMENTATION_TYPE, klass, categ, NULL_TREE, |
| NULL_TREE); |
| objc_ivar_chain |
| = continue_class (objc_implementation_context); |
| } |
| |
| void |
| objc_continue_implementation (void) |
| { |
| objc_ivar_chain |
| = continue_class (objc_implementation_context); |
| } |
| |
| void |
| objc_finish_implementation (void) |
| { |
| #ifdef OBJCPLUS |
| if (flag_objc_call_cxx_cdtors) |
| objc_generate_cxx_cdtors (); |
| #endif |
| |
| if (objc_implementation_context) |
| { |
| finish_class (objc_implementation_context); |
| objc_ivar_chain = NULL_TREE; |
| objc_implementation_context = NULL_TREE; |
| } |
| else |
| warning (0, "%<@end%> must appear in an @implementation context"); |
| } |
| |
| void |
| objc_set_visibility (objc_ivar_visibility_kind visibility) |
| { |
| if (visibility == OBJC_IVAR_VIS_PACKAGE) |
| { |
| if (flag_objc1_only) |
| error ("%<@package%> is not available in Objective-C 1.0"); |
| else |
| warning (0, "%<@package%> presently has the same effect as %<@public%>"); |
| } |
| objc_ivar_visibility = visibility; |
| } |
| |
| void |
| objc_set_method_opt (bool optional) |
| { |
| if (flag_objc1_only) |
| { |
| if (optional) |
| error_at (input_location, "%<@optional%> is not available in Objective-C 1.0"); |
| else |
| error_at (input_location, "%<@required%> is not available in Objective-C 1.0"); |
| } |
| |
| objc_method_optional_flag = optional; |
| if (!objc_interface_context |
| || TREE_CODE (objc_interface_context) != PROTOCOL_INTERFACE_TYPE) |
| { |
| if (optional) |
| error ("%<@optional%> is allowed in @protocol context only"); |
| else |
| error ("%<@required%> is allowed in @protocol context only"); |
| objc_method_optional_flag = false; |
| } |
| } |
| |
| /* This routine looks for a given PROPERTY in a list of CLASS, CATEGORY, or |
| PROTOCOL. */ |
| static tree |
| lookup_property_in_list (tree chain, tree property) |
| { |
| tree x; |
| for (x = CLASS_PROPERTY_DECL (chain); x; x = TREE_CHAIN (x)) |
| if (PROPERTY_NAME (x) == property) |
| return x; |
| return NULL_TREE; |
| } |
| |
| /* This routine looks for a given PROPERTY in the tree chain of RPROTO_LIST. */ |
| static tree lookup_property_in_protocol_list (tree rproto_list, tree property) |
| { |
| tree rproto, x; |
| for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto)) |
| { |
| tree p = TREE_VALUE (rproto); |
| if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) |
| { |
| if ((x = lookup_property_in_list (p, property))) |
| return x; |
| if (PROTOCOL_LIST (p)) |
| return lookup_property_in_protocol_list (PROTOCOL_LIST (p), property); |
| } |
| else |
| { |
| ; /* An identifier...if we could not find a protocol. */ |
| } |
| } |
| return NULL_TREE; |
| } |
| |
| /* This routine looks up the PROPERTY in current INTERFACE, its categories and up the |
| chain of interface hierarchy. */ |
| static tree |
| lookup_property (tree interface_type, tree property) |
| { |
| tree inter = interface_type; |
| while (inter) |
| { |
| tree x, category; |
| if ((x = lookup_property_in_list (inter, property))) |
| return x; |
| /* Failing that, look for the property in each category of the class. */ |
| category = inter; |
| while ((category = CLASS_CATEGORY_LIST (category))) |
| { |
| if ((x = lookup_property_in_list (category, property))) |
| return x; |
| |
| /* When checking a category, also check the protocols |
| attached with the category itself. */ |
| if (CLASS_PROTOCOL_LIST (category) |
| && (x = lookup_property_in_protocol_list |
| (CLASS_PROTOCOL_LIST (category), property))) |
| return x; |
| } |
| |
| /* Failing to find in categories, look for property in protocol list. */ |
| if (CLASS_PROTOCOL_LIST (inter) |
| && (x = lookup_property_in_protocol_list |
| (CLASS_PROTOCOL_LIST (inter), property))) |
| return x; |
| |
| /* Failing that, climb up the inheritance hierarchy. */ |
| inter = lookup_interface (CLASS_SUPER_NAME (inter)); |
| } |
| return inter; |
| } |
| |
| /* This routine returns a PROPERTY_KIND for the front end RID code supplied. */ |
| |
| enum objc_property_attribute_kind |
| objc_prop_attr_kind_for_rid (enum rid prop_rid) |
| { |
| switch (prop_rid) |
| { |
| default: return OBJC_PROPERTY_ATTR_UNKNOWN; |
| case RID_GETTER: return OBJC_PROPERTY_ATTR_GETTER; |
| case RID_SETTER: return OBJC_PROPERTY_ATTR_SETTER; |
| |
| case RID_READONLY: return OBJC_PROPERTY_ATTR_READONLY; |
| case RID_READWRITE: return OBJC_PROPERTY_ATTR_READWRITE; |
| |
| case RID_ASSIGN: return OBJC_PROPERTY_ATTR_ASSIGN; |
| case RID_RETAIN: return OBJC_PROPERTY_ATTR_RETAIN; |
| case RID_COPY: return OBJC_PROPERTY_ATTR_COPY; |
| |
| case RID_PROPATOMIC: return OBJC_PROPERTY_ATTR_ATOMIC; |
| case RID_NONATOMIC: return OBJC_PROPERTY_ATTR_NONATOMIC; |
| |
| case RID_NULL_UNSPECIFIED:return OBJC_PROPERTY_ATTR_NULL_UNSPECIFIED; |
| case RID_NULLABLE: return OBJC_PROPERTY_ATTR_NULLABLE; |
| case RID_NONNULL: return OBJC_PROPERTY_ATTR_NONNULL; |
| case RID_NULL_RESETTABLE: return OBJC_PROPERTY_ATTR_NULL_RESETTABLE; |
| |
| case RID_CLASS: return OBJC_PROPERTY_ATTR_CLASS; |
| } |
| } |
| |
| /* This routine is called by the parser when a |
| @property... declaration is found. 'decl' is the declaration of |
| the property (type/identifier), and the other arguments represent |
| property attributes that may have been specified in the Objective-C |
| declaration. 'parsed_property_readonly' is 'true' if the attribute |
| 'readonly' was specified, and 'false' if not; similarly for the |
| other bool parameters. 'property_getter_ident' is NULL_TREE |
| if the attribute 'getter' was not specified, and is the identifier |
| corresponding to the specified getter if it was; similarly for |
| 'property_setter_ident'. */ |
| void |
| objc_add_property_declaration (location_t location, tree decl, |
| vec<property_attribute_info *>& prop_attr_list) |
| { |
| if (flag_objc1_only) |
| /* FIXME: we probably ought to bail out at this point. */ |
| error_at (location, "%<@property%> is not available in Objective-C 1.0"); |
| |
| /* We must be in an interface, category, or protocol. */ |
| if (!objc_interface_context) |
| { |
| error_at (location, "property declaration not in %<@interface%>," |
| " %<@protocol%> or %<category%> context"); |
| return; |
| } |
| |
| /* Do some spot-checks for the most obvious invalid cases. */ |
| |
| gcc_checking_assert (decl && TREE_CODE (decl) == FIELD_DECL); |
| |
| if (decl && !DECL_NAME (decl)) |
| { |
| error_at (location, "properties must be named"); |
| return; |
| } |
| |
| location_t decl_loc = DECL_SOURCE_LOCATION (decl); |
| decl_loc = make_location (decl_loc, location, decl_loc); |
| if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) |
| { |
| error_at (decl_loc, "property cannot be an array"); |
| return; |
| } |
| |
| if (DECL_C_BIT_FIELD (decl)) |
| { |
| /* A @property is not an actual variable, but it is a way to |
| describe a pair of accessor methods, so its type (which is |
| the type of the return value of the getter and the first |
| argument of the setter) can't be a bitfield (as return values |
| and arguments of functions cannot be bitfields). The |
| underlying instance variable could be a bitfield, but that is |
| a different matter. */ |
| error_at (decl_loc, "property cannot be a bit-field"); |
| return; |
| } |
| |
| /* The final results of parsing the (growing number) of property |
| attributes. */ |
| property_attribute_info *attrs[OBJC_PROPATTR_GROUP_MAX] = { nullptr }; |
| |
| tree property_getter_ident = NULL_TREE; |
| tree property_setter_ident = NULL_TREE; |
| for (unsigned pn = 0; pn < prop_attr_list.length (); ++pn) |
| { |
| if (prop_attr_list[pn]->parse_error) |
| continue; /* Ignore attributes known to be wrongly parsed. */ |
| |
| switch (int g = (int) prop_attr_list[pn]->group()) |
| { |
| case OBJC_PROPATTR_GROUP_UNKNOWN: |
| continue; |
| case OBJC_PROPATTR_GROUP_SETTER: |
| case OBJC_PROPATTR_GROUP_GETTER: |
| if (attrs[g]) |
| { |
| warning_at (prop_attr_list[pn]->prop_loc, OPT_Wattributes, |
| "multiple property %qE methods specified, the latest" |
| " one will be used", attrs[g]->name); |
| inform (attrs[g]->prop_loc, "previous specification"); |
| } |
| attrs[g] = prop_attr_list[pn]; |
| if (g == OBJC_PROPATTR_GROUP_SETTER) |
| property_setter_ident = attrs[g]->ident; |
| else |
| property_getter_ident = attrs[g]->ident; |
| continue; |
| default: |
| { |
| if (!attrs[g]) |
| ; |
| else if (attrs[g]->prop_kind != prop_attr_list[pn]->prop_kind) |
| { |
| error_at (prop_attr_list[pn]->prop_loc, |
| "%qE attribute conflicts with %qE attribute", |
| prop_attr_list[pn]->name, attrs[g]->name); |
| inform (attrs[g]->prop_loc, "%qE specified here", |
| attrs[g]->name ); |
| } |
| else |
| { |
| warning_at (prop_attr_list[pn]->prop_loc, OPT_Wattributes, |
| "duplicate %qE attribute", attrs[g]->name); |
| inform (attrs[g]->prop_loc, "first specified here"); |
| } |
| attrs[g] = prop_attr_list[pn]; |
| } |
| continue; |
| } |
| } |
| |
| /* The defaults for atomicity (atomic) and write-ability (readwrite) apply |
| even if the user provides no specified attributes. */ |
| bool property_nonatomic = false; |
| bool property_readonly = false; |
| |
| /* Set the values from any specified by the user; these are easy, only two |
| states. */ |
| if (attrs[OBJC_PROPATTR_GROUP_ATOMIC]) |
| property_nonatomic = attrs[OBJC_PROPATTR_GROUP_ATOMIC]->prop_kind |
| == OBJC_PROPERTY_ATTR_NONATOMIC; |
| |
| if (attrs[OBJC_PROPATTR_GROUP_READWRITE]) |
| property_readonly = attrs[OBJC_PROPATTR_GROUP_READWRITE]->prop_kind |
| == OBJC_PROPERTY_ATTR_READONLY; |
| |
| /* One can't set a readonly value; we issue an error, but force the property |
| to readwrite as well. */ |
| if (property_readonly && property_setter_ident) |
| { |
| error_at (attrs[OBJC_PROPATTR_GROUP_READWRITE]->prop_loc, "%<readonly%>" |
| " attribute conflicts with %<setter%> attribute"); |
| gcc_checking_assert (attrs[OBJC_PROPATTR_GROUP_SETTER]); |
| inform (attrs[OBJC_PROPATTR_GROUP_SETTER]->prop_loc, "%<setter%>" |
| " specified here"); |
| property_readonly = false; |
| } |
| |
| /* Assign semantics is a tri-state property, and also needs some further |
| checking against the object type. */ |
| objc_property_assign_semantics property_assign_semantics |
| = OBJC_PROPERTY_ASSIGN; |
| |
| if (attrs[OBJC_PROPATTR_GROUP_ASSIGN]) |
| { |
| if (attrs[OBJC_PROPATTR_GROUP_ASSIGN]->prop_kind |
| == OBJC_PROPERTY_ATTR_ASSIGN) |
| property_assign_semantics = OBJC_PROPERTY_ASSIGN; |
| else if (attrs[OBJC_PROPATTR_GROUP_ASSIGN]->prop_kind |
| == OBJC_PROPERTY_ATTR_RETAIN) |
| property_assign_semantics = OBJC_PROPERTY_RETAIN; |
| else if (attrs[OBJC_PROPATTR_GROUP_ASSIGN]->prop_kind |
| == OBJC_PROPERTY_ATTR_COPY) |
| property_assign_semantics = OBJC_PROPERTY_COPY; |
| else |
| gcc_unreachable (); |
| } |
| |
| /* An attribute that indicates this property manipulates a class variable. |
| In this case, both the variable and the getter/setter must be provided |
| by the user. */ |
| bool property_class = false; |
| if (attrs[OBJC_PROPATTR_GROUP_CLASS]) |
| property_nonatomic = attrs[OBJC_PROPATTR_GROUP_CLASS]->prop_kind |
| == OBJC_PROPERTY_ATTR_CLASS; |
| |
| /* Nullability specifications for the property. */ |
| enum objc_property_nullability property_nullability |
| = OBJC_PROPERTY_NULL_UNSET; |
| if (attrs[OBJC_PROPATTR_GROUP_NULLABLE]) |
| { |
| if (attrs[OBJC_PROPATTR_GROUP_NULLABLE]->prop_kind |
| == OBJC_PROPERTY_ATTR_NULL_UNSPECIFIED) |
| property_nullability = OBJC_PROPERTY_NULL_UNSPECIFIED; |
| else if (attrs[OBJC_PROPATTR_GROUP_NULLABLE]->prop_kind |
| == OBJC_PROPERTY_ATTR_NULLABLE) |
| property_nullability = OBJC_PROPERTY_NULLABLE; |
| else if (attrs[OBJC_PROPATTR_GROUP_NULLABLE]->prop_kind |
| == OBJC_PROPERTY_ATTR_NONNULL) |
| property_nullability = OBJC_PROPERTY_NONNULL; |
| else if (attrs[OBJC_PROPATTR_GROUP_NULLABLE]->prop_kind |
| == OBJC_PROPERTY_ATTR_NULL_RESETTABLE) |
| property_nullability = OBJC_PROPERTY_NULL_RESETTABLE; |
| else |
| gcc_unreachable (); |
| } |
| |
| /* TODO: Check that the property type is an Objective-C object or a |
| "POD". */ |
| |
| /* Implement -Wproperty-assign-default (which is enabled by default). */ |
| if (warn_property_assign_default |
| /* If garbage collection is not being used, then 'assign' is |
| valid for objects (and typically used for delegates) but it |
| is wrong in most cases (since most objects need to be |
| retained or copied in setters). Warn users when 'assign' is |
| used implicitly. */ |
| && property_assign_semantics == OBJC_PROPERTY_ASSIGN |
| /* Read-only properties are never assigned, so the assignment |
| semantics do not matter in that case. */ |
| && !property_readonly |
| && !flag_objc_gc) |
| { |
| /* Please note that it would make sense to default to 'assign' |
| for non-{Objective-C objects}, and to 'retain' for |
| Objective-C objects. But that would break compatibility with |
| other compilers. */ |
| if (!attrs[OBJC_PROPATTR_GROUP_ASSIGN]) |
| { |
| /* Use 'false' so we do not warn for Class objects. */ |
| if (objc_type_valid_for_messaging (TREE_TYPE (decl), false)) |
| { |
| warning_at (decl_loc, 0, "object property %qD has no %<assign%>," |
| " %<retain%> or %<copy%> attribute; assuming" |
| " %<assign%>", decl); |
| inform (decl_loc, "%<assign%> can be unsafe for Objective-C" |
| " objects; please state explicitly if you need it"); |
| } |
| } |
| } |
| |
| /* Some attributes make no sense unless applied to an Objective-C object. */ |
| bool prop_objc_object_p |
| = objc_type_valid_for_messaging (TREE_TYPE (decl), true); |
| if (!prop_objc_object_p) |
| { |
| tree p_name = NULL_TREE; |
| if (property_assign_semantics == OBJC_PROPERTY_RETAIN |
| || property_assign_semantics == OBJC_PROPERTY_COPY) |
| p_name = attrs[OBJC_PROPATTR_GROUP_ASSIGN]->name; |
| |
| if (p_name) |
| error_at (decl_loc, "%qE attribute is only valid for Objective-C" |
| " objects", p_name); |
| } |
| |
| /* Now determine the final property getter and setter names. They |
| will be stored in the PROPERTY_DECL, from which they'll always be |
| extracted and used. */ |
| |
| /* Adjust, or fill in, setter and getter names. We overwrite the |
| property_setter_ident and property_getter_ident |
| with the final setter and getter identifiers that will be |
| used. */ |
| if (property_setter_ident) |
| { |
| /* The setter should be terminated by ':', but the parser only |
| gives us an identifier without ':'. So, we need to add ':' |
| at the end. */ |
| const char *parsed_setter = IDENTIFIER_POINTER (property_setter_ident); |
| size_t length = strlen (parsed_setter); |
| char *final_setter = (char *)alloca (length + 2); |
| |
| sprintf (final_setter, "%s:", parsed_setter); |
| property_setter_ident = get_identifier (final_setter); |
| } |
| else |
| { |
| if (!property_readonly) |
| property_setter_ident = get_identifier (objc_build_property_setter_name |
| (DECL_NAME (decl))); |
| } |
| |
| if (!property_getter_ident) |
| property_getter_ident = DECL_NAME (decl); |
| |
| /* Check for duplicate property declarations. We first check the |
| immediate context for a property with the same name. Any such |
| declarations are an error, unless this is a class extension and |
| we are extending a property from readonly to readwrite. */ |
| bool property_extension_in_class_extension = false; |
| tree x = NULL_TREE; |
| for (x = CLASS_PROPERTY_DECL (objc_interface_context); x; x = TREE_CHAIN (x)) |
| { |
| if (PROPERTY_NAME (x) == DECL_NAME (decl)) |
| { |
| if (objc_in_class_extension |
| && !property_readonly |
| && PROPERTY_READONLY (x) == 1) |
| { |
| /* This is a class extension, and we are extending an |
| existing readonly property to a readwrite one. |
| That's fine. :-) */ |
| property_extension_in_class_extension = true; |
| break; |
| } |
| else |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (x); |
| |
| error_at (location, "redeclaration of property %qD", decl); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| } |
| } |
| |
| /* If x is not NULL_TREE, we must be in a class extension and we're |
| extending a readonly property. In that case, no point in |
| searching for another declaration. */ |
| if (x == NULL_TREE) |
| { |
| /* We now need to check for existing property declarations (in |
| the superclass, other categories or protocols) and check that |
| the new declaration is not in conflict with existing |
| ones. */ |
| |
| /* Search for a previous, existing declaration of a property |
| with the same name in superclasses, protocols etc. If one is |
| found, it will be in the 'x' variable. */ |
| |
| /* Note that, for simplicity, the following may search again the |
| local context. That's Ok as nothing will be found (else we'd |
| have thrown an error above); it's only a little inefficient, |
| but the code is simpler. */ |
| switch (TREE_CODE (objc_interface_context)) |
| { |
| case CLASS_INTERFACE_TYPE: |
| /* Look up the property in the current @interface (which |
| will find nothing), then its protocols and categories and |
| superclasses. */ |
| x = lookup_property (objc_interface_context, DECL_NAME (decl)); |
| break; |
| case CATEGORY_INTERFACE_TYPE: |
| /* Look up the property in the main @interface, then |
| protocols and categories (one of them is ours, and will |
| find nothing) and superclasses. */ |
| x = lookup_property (lookup_interface (CLASS_NAME (objc_interface_context)), |
| DECL_NAME (decl)); |
| break; |
| case PROTOCOL_INTERFACE_TYPE: |
| /* Looks up the property in any protocols attached to the |
| current protocol. */ |
| if (PROTOCOL_LIST (objc_interface_context)) |
| { |
| x = lookup_property_in_protocol_list (PROTOCOL_LIST (objc_interface_context), |
| DECL_NAME (decl)); |
| } |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| if (x != NULL_TREE) |
| { |
| /* An existing property was found; check that it has the same |
| types, or it is compatible. */ |
| location_t original_location = DECL_SOURCE_LOCATION (x); |
| |
| if (PROPERTY_NONATOMIC (x) != property_nonatomic) |
| { |
| warning_at (location, 0, |
| "%<nonatomic%> attribute of property %qD conflicts with " |
| "previous declaration", decl); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| if (PROPERTY_GETTER_NAME (x) != property_getter_ident) |
| { |
| warning_at (location, 0, |
| "%<getter%> attribute of property %qD conflicts with " |
| "previous declaration", decl); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| /* We can only compare the setter names if both the old and new property have a setter. */ |
| if (!property_readonly && !PROPERTY_READONLY(x)) |
| { |
| if (PROPERTY_SETTER_NAME (x) != property_setter_ident) |
| { |
| warning_at (location, 0, |
| "%<setter%> attribute of property %qD conflicts with " |
| "previous declaration", decl); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| } |
| |
| if (PROPERTY_ASSIGN_SEMANTICS (x) != property_assign_semantics) |
| { |
| warning_at (location, 0, |
| "assign semantics attributes of property %qD conflict with previous declaration", decl); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| /* It's ok to have a readonly property that becomes a readwrite, but not vice versa. */ |
| if (PROPERTY_READONLY (x) == 0 && property_readonly == 1) |
| { |
| warning_at (location, 0, |
| "%<readonly%> attribute of property %qD conflicts with " |
| "previous declaration", decl); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| /* We now check that the new and old property declarations have |
| the same types (or compatible one). In the Objective-C |
| tradition of loose type checking, we do type-checking but |
| only generate warnings (not errors) if they do not match. |
| For non-readonly properties, the types must match exactly; |
| for readonly properties, it is allowed to use a "more |
| specialized" type in the new property declaration. Eg, the |
| superclass has a getter returning (NSArray *) and the |
| subclass a getter returning (NSMutableArray *). The object's |
| getter returns an (NSMutableArray *); but if you cast the |
| object to the superclass, which is allowed, you'd still |
| expect the getter to return an (NSArray *), which works since |
| an (NSMutableArray *) is an (NSArray *) too. So, the set of |
| objects belonging to the type of the new @property should be |
| a subset of the set of objects belonging to the type of the |
| old @property. This is what "specialization" means. And the |
| reason it only applies to readonly properties is that for a |
| readwrite property the setter would have the opposite |
| requirement - ie that the superclass type is more specialized |
| then the subclass one; hence the only way to satisfy both |
| constraints is that the types match. */ |
| |
| /* If the types are not the same in the C sense, we warn ... */ |
| if (!comptypes (TREE_TYPE (x), TREE_TYPE (decl)) |
| /* ... unless the property is readonly, in which case we |
| allow a new, more specialized, declaration. */ |
| && (!property_readonly |
| || !objc_compare_types (TREE_TYPE (x), |
| TREE_TYPE (decl), -5, NULL_TREE))) |
| { |
| warning_at (location, 0, |
| "type of property %qD conflicts with previous declaration", decl); |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| /* If we are in a class extension and we're extending a readonly |
| property in the main @interface, we'll just update the |
| existing property with the readwrite flag and potentially the |
| new setter name. */ |
| if (property_extension_in_class_extension) |
| { |
| PROPERTY_READONLY (x) = 0; |
| PROPERTY_SETTER_NAME (x) = property_setter_ident; |
| return; |
| } |
| } |
| |
| /* Create a PROPERTY_DECL node. */ |
| tree property_decl = make_node (PROPERTY_DECL); |
| |
| /* Copy the basic information from the original decl. */ |
| tree p_type = TREE_TYPE (decl); |
| TREE_TYPE (property_decl) = p_type; |
| DECL_SOURCE_LOCATION (property_decl) = DECL_SOURCE_LOCATION (decl); |
| TREE_DEPRECATED (property_decl) = TREE_DEPRECATED (decl); |
| TREE_UNAVAILABLE (property_decl) = TREE_UNAVAILABLE (decl); |
| |
| /* Add property-specific information. */ |
| PROPERTY_NAME (property_decl) = DECL_NAME (decl); |
| PROPERTY_GETTER_NAME (property_decl) = property_getter_ident; |
| PROPERTY_SETTER_NAME (property_decl) = property_setter_ident; |
| PROPERTY_READONLY (property_decl) = property_readonly; |
| PROPERTY_NONATOMIC (property_decl) = property_nonatomic; |
| PROPERTY_CLASS (property_decl) = property_class; |
| PROPERTY_ASSIGN_SEMANTICS (property_decl) = property_assign_semantics; |
| PROPERTY_IVAR_NAME (property_decl) = NULL_TREE; |
| PROPERTY_DYNAMIC (property_decl) = 0; |
| |
| /* FIXME: We seem to drop any existing DECL_ATTRIBUTES on the floor. */ |
| if (property_nullability != OBJC_PROPERTY_NULL_UNSET) |
| { |
| if (p_type && !POINTER_TYPE_P (p_type)) |
| error_at (decl_loc, "nullability specifier %qE cannot be applied to" |
| " non-pointer type %qT", |
| attrs[OBJC_PROPATTR_GROUP_NULLABLE]->name, p_type); |
| else if (p_type && POINTER_TYPE_P (p_type) && TREE_TYPE (p_type) |
| && POINTER_TYPE_P (TREE_TYPE (p_type))) |
| error_at (decl_loc, "nullability specifier %qE cannot be applied to" |
| " multi-level pointer type %qT", |
| attrs[OBJC_PROPATTR_GROUP_NULLABLE]->name, p_type); |
| else |
| { |
| tree attr_name = get_identifier ("objc_nullability"); |
| tree attr_value = build_int_cst (unsigned_type_node, |
| (unsigned)property_nullability); |
| tree nulla = build_tree_list (attr_name, attr_value); |
| DECL_ATTRIBUTES (property_decl) = nulla; |
| } |
| } |
| |
| /* Remember the fact that the property was found in the @optional |
| section in a @protocol, or not. */ |
| if (objc_method_optional_flag) |
| PROPERTY_OPTIONAL (property_decl) = 1; |
| else |
| PROPERTY_OPTIONAL (property_decl) = 0; |
| |
| /* Note that PROPERTY_GETTER_NAME is always set for all |
| PROPERTY_DECLs, and PROPERTY_SETTER_NAME is always set for all |
| PROPERTY_DECLs where PROPERTY_READONLY == 0. Any time we deal |
| with a getter or setter, we should get the PROPERTY_DECL and use |
| PROPERTY_GETTER_NAME and PROPERTY_SETTER_NAME to know the correct |
| names. */ |
| |
| /* Add the PROPERTY_DECL to the list of properties for the class. */ |
| TREE_CHAIN (property_decl) = CLASS_PROPERTY_DECL (objc_interface_context); |
| CLASS_PROPERTY_DECL (objc_interface_context) = property_decl; |
| } |
| |
| /* This is a subroutine of objc_maybe_build_component_ref. Search the |
| list of methods in the interface (and, failing that, the local list |
| in the implementation, and failing that, the protocol list) |
| provided for a 'setter' or 'getter' for 'component' with default |
| names (ie, if 'component' is "name", then search for "name" and |
| "setName:"). It is also possible to specify a different |
| 'getter_name' (this is used for @optional readonly properties). If |
| any is found, then create an artificial property that uses them. |
| Return NULL_TREE if 'getter' or 'setter' could not be found. */ |
| static tree |
| maybe_make_artificial_property_decl (tree interface, tree implementation, |
| tree protocol_list, tree component, bool is_class, |
| tree getter_name) |
| { |
| tree setter_name = get_identifier (objc_build_property_setter_name (component)); |
| tree getter = NULL_TREE; |
| tree setter = NULL_TREE; |
| |
| if (getter_name == NULL_TREE) |
| getter_name = component; |
| |
| /* First, check the @interface and all superclasses. */ |
| if (interface) |
| { |
| int flags = 0; |
| |
| /* Using instance methods of the root class as accessors is most |
| likely unwanted and can be extremely confusing (and, most |
| importantly, other Objective-C 2.0 compilers do not do it). |
| Turn it off. */ |
| if (is_class) |
| flags = OBJC_LOOKUP_CLASS | OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS; |
| |
| getter = lookup_method_static (interface, getter_name, flags); |
| setter = lookup_method_static (interface, setter_name, flags); |
| } |
| |
| /* Second, check the local @implementation context. */ |
| if (!getter && !setter) |
| { |
| if (implementation) |
| { |
| if (is_class) |
| { |
| getter = lookup_method (CLASS_CLS_METHODS (implementation), getter_name); |
| setter = lookup_method (CLASS_CLS_METHODS (implementation), setter_name); |
| } |
| else |
| { |
| getter = lookup_method (CLASS_NST_METHODS (implementation), getter_name); |
| setter = lookup_method (CLASS_NST_METHODS (implementation), setter_name); |
| } |
| } |
| } |
| |
| /* Try the protocol_list if we didn't find anything in the |
| @interface and in the @implementation. */ |
| if (!getter && !setter) |
| { |
| getter = lookup_method_in_protocol_list (protocol_list, getter_name, is_class); |
| setter = lookup_method_in_protocol_list (protocol_list, setter_name, is_class); |
| } |
| |
| /* There needs to be at least a getter or setter for this to be a |
| valid 'object.component' syntax. */ |
| if (getter || setter) |
| { |
| /* Yes ... determine the type of the expression. */ |
| tree property_decl; |
| tree type; |
| |
| if (getter) |
| type = TREE_VALUE (TREE_TYPE (getter)); |
| else |
| type = TREE_VALUE (TREE_TYPE (METHOD_SEL_ARGS (setter))); |
| |
| /* Create an artificial property declaration with the |
| information we collected on the type and getter/setter |
| names. */ |
| property_decl = make_node (PROPERTY_DECL); |
| |
| TREE_TYPE (property_decl) = type; |
| DECL_SOURCE_LOCATION (property_decl) = input_location; |
| TREE_DEPRECATED (property_decl) = 0; |
| TREE_UNAVAILABLE (property_decl) = 0; |
| DECL_ARTIFICIAL (property_decl) = 1; |
| |
| /* Add property-specific information. Note that one of |
| PROPERTY_GETTER_NAME or PROPERTY_SETTER_NAME may refer to a |
| non-existing method; this will generate an error when the |
| expression is later compiled. At this stage we don't know if |
| the getter or setter will be used, so we can't generate an |
| error. */ |
| PROPERTY_NAME (property_decl) = component; |
| PROPERTY_GETTER_NAME (property_decl) = getter_name; |
| PROPERTY_SETTER_NAME (property_decl) = setter_name; |
| PROPERTY_READONLY (property_decl) = 0; |
| PROPERTY_NONATOMIC (property_decl) = 0; |
| PROPERTY_ASSIGN_SEMANTICS (property_decl) = 0; |
| PROPERTY_IVAR_NAME (property_decl) = NULL_TREE; |
| PROPERTY_DYNAMIC (property_decl) = 0; |
| PROPERTY_OPTIONAL (property_decl) = 0; |
| |
| if (!getter) |
| PROPERTY_HAS_NO_GETTER (property_decl) = 1; |
| |
| /* The following is currently unused, but it's nice to have |
| there. We may use it if we need in the future. */ |
| if (!setter) |
| PROPERTY_HAS_NO_SETTER (property_decl) = 1; |
| |
| return property_decl; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* This hook routine is invoked by the parser when an expression such |
| as 'xxx.yyy' is parsed. We get a chance to process these |
| expressions in a way that is specified to Objective-C (to implement |
| the Objective-C 2.0 dot-syntax, properties, or non-fragile ivars). |
| If the expression is not an Objective-C specified expression, we |
| should return NULL_TREE; else we return the expression. |
| |
| At the moment this only implements dot-syntax and properties (not |
| non-fragile ivars yet), ie 'object.property' or 'object.component' |
| where 'component' is not a declared property, but a valid getter or |
| setter for it could be found. */ |
| tree |
| objc_maybe_build_component_ref (tree object, tree property_ident) |
| { |
| tree x = NULL_TREE; |
| tree rtype; |
| |
| /* If we are in Objective-C 1.0 mode, dot-syntax and properties are |
| not available. */ |
| if (flag_objc1_only) |
| return NULL_TREE; |
| |
| /* Try to determine if 'object' is an Objective-C object or not. If |
| not, return. */ |
| if (object == NULL_TREE || object == error_mark_node |
| || (rtype = TREE_TYPE (object)) == NULL_TREE) |
| return NULL_TREE; |
| |
| if (property_ident == NULL_TREE || property_ident == error_mark_node |
| || TREE_CODE (property_ident) != IDENTIFIER_NODE) |
| return NULL_TREE; |
| |
| /* The following analysis of 'object' is similar to the one used for |
| the 'receiver' of a method invocation. We need to determine what |
| 'object' is and find the appropriate property (either declared, |
| or artificial) for it (in the same way as we need to find the |
| appropriate method prototype for a method invocation). There are |
| some simplifications here though: "object.property" is invalid if |
| "object" has a type of "id" or "Class"; it must at least have a |
| protocol attached to it, and "object" is never a class name as |
| that is done by objc_build_class_component_ref. Finally, we |
| don't know if this really is a dot-syntax expression, so we want |
| to make a quick exit if it is not; for this reason, we try to |
| postpone checks after determining that 'object' looks like an |
| Objective-C object. */ |
| |
| if (objc_is_id (rtype)) |
| { |
| /* This is the case that the 'object' is of type 'id' or |
| 'Class'. */ |
| |
| /* Check if at least it is of type 'id <Protocol>' or 'Class |
| <Protocol>'; if so, look the property up in the |
| protocols. */ |
| if (TYPE_HAS_OBJC_INFO (TREE_TYPE (rtype))) |
| { |
| tree rprotos = TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (rtype)); |
| |
| if (rprotos) |
| { |
| /* No point looking up declared @properties if we are |
| dealing with a class. Classes have no declared |
| properties. */ |
| if (!IS_CLASS (rtype)) |
| x = lookup_property_in_protocol_list (rprotos, property_ident); |
| |
| if (x == NULL_TREE) |
| { |
| /* Ok, no property. Maybe it was an |
| object.component dot-syntax without a declared |
| property (this is valid for classes too). Look |
| for getter/setter methods and internally declare |
| an artificial property based on them if found. */ |
| x = maybe_make_artificial_property_decl (NULL_TREE, |
| NULL_TREE, |
| rprotos, |
| property_ident, |
| IS_CLASS (rtype), |
| NULL_TREE); |
| } |
| else if (PROPERTY_OPTIONAL (x) && PROPERTY_READONLY (x)) |
| { |
| /* This is a special, complicated case. If the |
| property is optional, and is read-only, then the |
| property is always used for reading, but an |
| eventual existing non-property setter can be used |
| for writing. We create an artificial property |
| decl copying the getter from the optional |
| property, and looking up the setter in the |
| interface. */ |
| x = maybe_make_artificial_property_decl (NULL_TREE, |
| NULL_TREE, |
| rprotos, |
| property_ident, |
| false, |
| PROPERTY_GETTER_NAME (x)); |
| } |
| } |
| } |
| else if (objc_method_context) |
| { |
| /* Else, if we are inside a method it could be the case of |
| 'super' or 'self'. */ |
| tree interface_type = NULL_TREE; |
| tree t = object; |
| while (TREE_CODE (t) == COMPOUND_EXPR |
| || TREE_CODE (t) == MODIFY_EXPR |
| || CONVERT_EXPR_P (t) |
| || TREE_CODE (t) == COMPONENT_REF) |
| t = TREE_OPERAND (t, 0); |
| |
| STRIP_ANY_LOCATION_WRAPPER (t); |
| |
| if (t == UOBJC_SUPER_decl) |
| interface_type = lookup_interface (CLASS_SUPER_NAME (implementation_template)); |
| else if (t == self_decl) |
| interface_type = lookup_interface (CLASS_NAME (implementation_template)); |
| |
| if (interface_type) |
| { |
| if (TREE_CODE (objc_method_context) != CLASS_METHOD_DECL) |
| x = lookup_property (interface_type, property_ident); |
| |
| if (x == NULL_TREE) |
| { |
| /* Try the dot-syntax without a declared property. |
| If this is an access to 'self', it is possible |
| that they may refer to a setter/getter that is |
| not declared in the interface, but exists locally |
| in the implementation. In that case, get the |
| implementation context and use it. */ |
| tree implementation = NULL_TREE; |
| |
| if (t == self_decl) |
| implementation = objc_implementation_context; |
| |
| x = maybe_make_artificial_property_decl |
| (interface_type, implementation, NULL_TREE, |
| property_ident, |
| (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL), |
| NULL_TREE); |
| } |
| else if (PROPERTY_OPTIONAL (x) && PROPERTY_READONLY (x)) |
| { |
| tree implementation = NULL_TREE; |
| |
| if (t == self_decl) |
| implementation = objc_implementation_context; |
| |
| x = maybe_make_artificial_property_decl (interface_type, |
| implementation, |
| NULL_TREE, |
| property_ident, |
| false, |
| PROPERTY_GETTER_NAME (x)); |
| } |
| } |
| } |
| } |
| else |
| { |
| /* This is the case where we have more information on 'rtype'. */ |
| tree basetype = TYPE_MAIN_VARIANT (rtype); |
| |
| /* Skip the pointer - if none, it's not an Objective-C object or |
| class. */ |
| if (basetype != NULL_TREE && TREE_CODE (basetype) == POINTER_TYPE) |
| basetype = TREE_TYPE (basetype); |
| else |
| return NULL_TREE; |
| |
| /* Traverse typedefs. */ |
| while (basetype != NULL_TREE |
| && TREE_CODE (basetype) == RECORD_TYPE |
| && OBJC_TYPE_NAME (basetype) |
| && TREE_CODE (OBJC_TYPE_NAME (basetype)) == TYPE_DECL |
| && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (basetype))) |
| basetype = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (basetype)); |
| |
| if (basetype != NULL_TREE && TYPED_OBJECT (basetype)) |
| { |
| tree interface_type = TYPE_OBJC_INTERFACE (basetype); |
| tree protocol_list = TYPE_OBJC_PROTOCOL_LIST (basetype); |
| |
| if (interface_type |
| && (TREE_CODE (interface_type) == CLASS_INTERFACE_TYPE |
| || TREE_CODE (interface_type) == CATEGORY_INTERFACE_TYPE |
| || TREE_CODE (interface_type) == PROTOCOL_INTERFACE_TYPE)) |
| { |
| /* Not sure 'rtype' could ever be a class here! Just |
| for safety we keep the checks. */ |
| if (!IS_CLASS (rtype)) |
| { |
| x = lookup_property (interface_type, property_ident); |
| |
| if (x == NULL_TREE) |
| x = lookup_property_in_protocol_list (protocol_list, |
| property_ident); |
| } |
| |
| if (x == NULL_TREE) |
| { |
| /* Try the dot-syntax without a declared property. |
| If we are inside a method implementation, it is |
| possible that they may refer to a setter/getter |
| that is not declared in the interface, but exists |
| locally in the implementation. In that case, get |
| the implementation context and use it. */ |
| tree implementation = NULL_TREE; |
| |
| if (objc_implementation_context |
| && CLASS_NAME (objc_implementation_context) |
| == OBJC_TYPE_NAME (interface_type)) |
| implementation = objc_implementation_context; |
| |
| x = maybe_make_artificial_property_decl (interface_type, |
| implementation, |
| protocol_list, |
| property_ident, |
| IS_CLASS (rtype), |
| NULL_TREE); |
| } |
| else if (PROPERTY_OPTIONAL (x) && PROPERTY_READONLY (x)) |
| { |
| tree implementation = NULL_TREE; |
| |
| if (objc_implementation_context |
| && CLASS_NAME (objc_implementation_context) |
| == OBJC_TYPE_NAME (interface_type)) |
| implementation = objc_implementation_context; |
| |
| x = maybe_make_artificial_property_decl (interface_type, |
| implementation, |
| protocol_list, |
| property_ident, |
| false, |
| PROPERTY_GETTER_NAME (x)); |
| } |
| } |
| } |
| } |
| |
| if (x) |
| { |
| tree expression; |
| tree getter_call; |
| tree method_prototype_avail = NULL_TREE; |
| |
| /* We have an additional nasty problem here; if this |
| PROPERTY_REF needs to become a 'getter', then the conversion |
| from PROPERTY_REF into a getter call happens in gimplify, |
| after the selector table has already been generated and when |
| it is too late to add another selector to it. To work around |
| the problem, we always create the getter call at this stage, |
| which puts the selector in the table. Note that if the |
| PROPERTY_REF becomes a 'setter' instead of a 'getter', then |
| we have added a selector too many to the selector table. |
| This is a little inefficient. |
| |
| Also note that method calls to 'self' and 'super' require the |
| context (self_decl, UOBJS_SUPER_decl, |
| objc_implementation_context etc) to be built correctly; this |
| is yet another reason why building the call at the gimplify |
| stage (when this context has been lost) is not very |
| practical. If we build it at this stage, we know it will |
| always be built correctly. |
| |
| If the PROPERTY_HAS_NO_GETTER() (ie, it is an artificial |
| property decl created to deal with a dotsyntax not really |
| referring to an existing property) then do not try to build a |
| call to the getter as there is no getter. */ |
| if (PROPERTY_HAS_NO_GETTER (x)) |
| getter_call = NULL_TREE; |
| else |
| getter_call = objc_finish_message_expr |
| (object, PROPERTY_GETTER_NAME (x), NULL_TREE, |
| /* Disable the immediate deprecation warning if the getter |
| is deprecated, but record the fact that the getter is |
| deprecated by setting PROPERTY_REF_DEPRECATED_GETTER to |
| the method prototype. */ |
| &method_prototype_avail); |
| |
| expression = build4 (PROPERTY_REF, TREE_TYPE(x), object, x, getter_call, |
| method_prototype_avail); |
| SET_EXPR_LOCATION (expression, input_location); |
| TREE_SIDE_EFFECTS (expression) = 1; |
| |
| return expression; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* This hook routine is invoked by the parser when an expression such |
| as 'xxx.yyy' is parsed, and 'xxx' is a class name. This is the |
| Objective-C 2.0 dot-syntax applied to classes, so we need to |
| convert it into a setter/getter call on the class. */ |
| tree |
| objc_build_class_component_ref (tree class_name, tree property_ident) |
| { |
| tree x = NULL_TREE; |
| tree object, rtype; |
| |
| if (flag_objc1_only) |
| error_at (input_location, "the dot syntax is not available in Objective-C 1.0"); |
| |
| if (class_name == NULL_TREE || class_name == error_mark_node |
| || TREE_CODE (class_name) != IDENTIFIER_NODE) |
| return error_mark_node; |
| |
| if (property_ident == NULL_TREE || property_ident == error_mark_node |
| || TREE_CODE (property_ident) != IDENTIFIER_NODE) |
| return NULL_TREE; |
| |
| object = objc_get_class_reference (class_name); |
| if (!object) |
| { |
| /* We know that 'class_name' is an Objective-C class name as the |
| parser won't call this function if it is not. This is only a |
| double-check for safety. */ |
| error_at (input_location, "could not find class %qE", class_name); |
| return error_mark_node; |
| } |
| |
| rtype = lookup_interface (class_name); |
| if (!rtype) |
| { |
| /* Again, this should never happen, but we do check. */ |
| error_at (input_location, "could not find interface for class %qE", class_name); |
| return error_mark_node; |
| } |
| else |
| { |
| if (TREE_UNAVAILABLE (rtype)) |
| error ("class %qE is unavailable", class_name); |
| else if (TREE_DEPRECATED (rtype)) |
| warning (OPT_Wdeprecated_declarations, "class %qE is deprecated", class_name); |
| } |
| |
| x = maybe_make_artificial_property_decl (rtype, NULL_TREE, NULL_TREE, |
| property_ident, |
| true, NULL_TREE); |
| |
| if (x) |
| { |
| tree expression; |
| tree getter_call; |
| tree method_prototype_avail = NULL_TREE; |
| |
| if (PROPERTY_HAS_NO_GETTER (x)) |
| getter_call = NULL_TREE; |
| else |
| getter_call = objc_finish_message_expr |
| (object, PROPERTY_GETTER_NAME (x), NULL_TREE, |
| &method_prototype_avail); |
| |
| expression = build4 (PROPERTY_REF, TREE_TYPE(x), object, x, getter_call, |
| method_prototype_avail); |
| SET_EXPR_LOCATION (expression, input_location); |
| TREE_SIDE_EFFECTS (expression) = 1; |
| |
| return expression; |
| } |
| else |
| { |
| error_at (input_location, "could not find setter/getter for %qE in class %qE", |
| property_ident, class_name); |
| return error_mark_node; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| |
| /* This is used because we don't want to expose PROPERTY_REF to the |
| C/C++ frontends. Maybe we should! */ |
| bool |
| objc_is_property_ref (tree node) |
| { |
| if (node && TREE_CODE (node) == PROPERTY_REF) |
| return true; |
| else |
| return false; |
| } |
| |
| /* We use this to report tree codes that are known to be invalid in const- |
| expression contexts. */ |
| bool |
| objc_non_constant_expr_p (tree node) |
| { |
| switch (TREE_CODE (node)) |
| { |
| default: |
| return false; |
| case MESSAGE_SEND_EXPR: |
| case PROPERTY_REF: |
| return true; |
| } |
| } |
| |
| /* This function builds a setter call for a PROPERTY_REF (real, for a |
| declared property, or artificial, for a dot-syntax accessor which |
| is not corresponding to a property). 'lhs' must be a PROPERTY_REF |
| (the caller must check this beforehand). 'rhs' is the value to |
| assign to the property. A plain setter call is returned, or |
| error_mark_node if the property is readonly. */ |
| |
| static tree |
| objc_build_setter_call (tree lhs, tree rhs) |
| { |
| tree object_expr = PROPERTY_REF_OBJECT (lhs); |
| tree property_decl = PROPERTY_REF_PROPERTY_DECL (lhs); |
| |
| if (PROPERTY_READONLY (property_decl)) |
| { |
| error ("%qs property cannot be set", "readonly"); |
| return error_mark_node; |
| } |
| else |
| { |
| tree setter_argument = build_tree_list (NULL_TREE, rhs); |
| tree setter; |
| |
| /* TODO: Check that the setter return type is 'void'. */ |
| |
| /* TODO: Decay arguments in C. */ |
| setter = objc_finish_message_expr (object_expr, |
| PROPERTY_SETTER_NAME (property_decl), |
| setter_argument, NULL); |
| return setter; |
| } |
| } |
| |
| /* This hook routine is called when a MODIFY_EXPR is being built. We |
| check what is being modified; if it is a PROPERTY_REF, we need to |
| generate a 'setter' function call for the property. If this is not |
| a PROPERTY_REF, we return NULL_TREE and the C/C++ frontend will go |
| on creating their MODIFY_EXPR. |
| |
| This is used for example if you write |
| |
| object.count = 1; |
| |
| where 'count' is a property. The left-hand side creates a |
| PROPERTY_REF, and then the compiler tries to generate a MODIFY_EXPR |
| to assign something to it. We intercept that here, and generate a |
| call to the 'setter' method instead. */ |
| tree |
| objc_maybe_build_modify_expr (tree lhs, tree rhs) |
| { |
| if (lhs && TREE_CODE (lhs) == PROPERTY_REF) |
| { |
| /* Building a simple call to the setter method would work for cases such as |
| |
| object.count = 1; |
| |
| but wouldn't work for cases such as |
| |
| count = object2.count = 1; |
| |
| to get these to work with very little effort, we build a |
| compound statement which does the setter call (to set the |
| property to 'rhs'), but which can also be evaluated returning |
| the 'rhs'. If the 'rhs' has no side effects, we can simply |
| evaluate it twice, building |
| |
| ([object setProperty: rhs]; rhs) |
| |
| If it has side effects, we put it in a temporary variable first, |
| so we create the following: |
| |
| (temp = rhs; [object setProperty: temp]; temp) |
| |
| setter_argument is rhs in the first case, and temp in the second |
| case. |
| */ |
| tree setter_argument; |
| |
| /* s1, s2 and s3 are the tree statements that we need in the |
| compound expression. */ |
| tree s1, s2, s3, compound_expr; |
| |
| if (TREE_SIDE_EFFECTS (rhs)) |
| { |
| tree bind; |
| |
| /* Declare __objc_property_temp in a local bind. */ |
| setter_argument = objc_create_temporary_var (TREE_TYPE (rhs), "__objc_property_temp"); |
| DECL_SOURCE_LOCATION (setter_argument) = input_location; |
| bind = build3 (BIND_EXPR, void_type_node, setter_argument, NULL, NULL); |
| SET_EXPR_LOCATION (bind, input_location); |
| TREE_SIDE_EFFECTS (bind) = 1; |
| add_stmt (bind); |
| |
| /* s1: x = rhs */ |
| s1 = build_modify_expr (input_location, setter_argument, NULL_TREE, |
| NOP_EXPR, |
| input_location, rhs, NULL_TREE); |
| SET_EXPR_LOCATION (s1, input_location); |
| } |
| else |
| { |
| /* No s1. */ |
| setter_argument = rhs; |
| s1 = NULL_TREE; |
| } |
| |
| /* Now build the compound statement. */ |
| |
| /* s2: [object setProperty: x] */ |
| s2 = objc_build_setter_call (lhs, setter_argument); |
| |
| /* This happens if building the setter failed because the |
| property is readonly. */ |
| if (s2 == error_mark_node) |
| return error_mark_node; |
| |
| SET_EXPR_LOCATION (s2, input_location); |
| |
| /* s3: x */ |
| s3 = convert (TREE_TYPE (lhs), setter_argument); |
| |
| /* Now build the compound statement (s1, s2, s3) or (s2, s3) as |
| appropriate. */ |
| if (s1) |
| compound_expr = build_compound_expr (input_location, build_compound_expr (input_location, s1, s2), s3); |
| else |
| compound_expr = build_compound_expr (input_location, s2, s3); |
| |
| /* Without this, with -Wall you get a 'valued computed is not |
| used' every time there is a "object.property = x" where the |
| value of the resulting MODIFY_EXPR is not used. That is |
| correct (maybe a more sophisticated implementation could |
| avoid generating the compound expression if not needed), but |
| we need to turn it off. */ |
| suppress_warning (compound_expr, OPT_Wunused); |
| return compound_expr; |
| } |
| else |
| return NULL_TREE; |
| } |
| |
| /* This hook is called by the frontend when one of the four unary |
| expressions PREINCREMENT_EXPR, POSTINCREMENT_EXPR, |
| PREDECREMENT_EXPR and POSTDECREMENT_EXPR is being built with an |
| argument which is a PROPERTY_REF. For example, this happens if you have |
| |
| object.count++; |
| |
| where 'count' is a property. We need to use the 'getter' and |
| 'setter' for the property in an appropriate way to build the |
| appropriate expression. 'code' is the code for the expression (one |
| of the four mentioned above); 'argument' is the PROPERTY_REF, and |
| 'increment' is how much we need to add or subtract. */ |
| tree |
| objc_build_incr_expr_for_property_ref (location_t location, |
| enum tree_code code, |
| tree argument, tree increment) |
| { |
| /* Here are the expressions that we want to build: |
| |
| For PREINCREMENT_EXPR / PREDECREMENT_EXPR: |
| (temp = [object property] +/- increment, [object setProperty: temp], temp) |
| |
| For POSTINCREMENT_EXPR / POSTECREMENT_EXPR: |
| (temp = [object property], [object setProperty: temp +/- increment], temp) */ |
| |
| tree temp_variable_decl, bind; |
| /* s1, s2 and s3 are the tree statements that we need in the |
| compound expression. */ |
| tree s1, s2, s3, compound_expr; |
| |
| /* Safety check. */ |
| if (!argument || TREE_CODE (argument) != PROPERTY_REF) |
| return error_mark_node; |
| |
| /* Declare __objc_property_temp in a local bind. */ |
| temp_variable_decl = objc_create_temporary_var (TREE_TYPE (argument), "__objc_property_temp"); |
| DECL_SOURCE_LOCATION (temp_variable_decl) = location; |
| bind = build3 (BIND_EXPR, void_type_node, temp_variable_decl, NULL, NULL); |
| SET_EXPR_LOCATION (bind, location); |
| TREE_SIDE_EFFECTS (bind) = 1; |
| add_stmt (bind); |
| |
| /* Now build the compound statement. */ |
| |
| /* Note that the 'getter' is generated at gimplify time; at this |
| time, we can simply put the property_ref (ie, argument) wherever |
| we want the getter ultimately to be. */ |
| |
| /* s1: __objc_property_temp = [object property] <+/- increment> */ |
| switch (code) |
| { |
| case PREINCREMENT_EXPR: |
| /* __objc_property_temp = [object property] + increment */ |
| s1 = build_modify_expr (location, temp_variable_decl, NULL_TREE, |
| NOP_EXPR, |
| location, build2 (PLUS_EXPR, TREE_TYPE (argument), |
| argument, increment), NULL_TREE); |
| break; |
| case PREDECREMENT_EXPR: |
| /* __objc_property_temp = [object property] - increment */ |
| s1 = build_modify_expr (location, temp_variable_decl, NULL_TREE, |
| NOP_EXPR, |
| location, build2 (MINUS_EXPR, TREE_TYPE (argument), |
| argument, increment), NULL_TREE); |
| break; |
| case POSTINCREMENT_EXPR: |
| case POSTDECREMENT_EXPR: |
| /* __objc_property_temp = [object property] */ |
| s1 = build_modify_expr (location, temp_variable_decl, NULL_TREE, |
| NOP_EXPR, |
| location, argument, NULL_TREE); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| /* s2: [object setProperty: __objc_property_temp <+/- increment>] */ |
| switch (code) |
| { |
| case PREINCREMENT_EXPR: |
| case PREDECREMENT_EXPR: |
| /* [object setProperty: __objc_property_temp] */ |
| s2 = objc_build_setter_call (argument, temp_variable_decl); |
| break; |
| case POSTINCREMENT_EXPR: |
| /* [object setProperty: __objc_property_temp + increment] */ |
| s2 = objc_build_setter_call (argument, |
| build2 (PLUS_EXPR, TREE_TYPE (argument), |
| temp_variable_decl, increment)); |
| break; |
| case POSTDECREMENT_EXPR: |
| /* [object setProperty: __objc_property_temp - increment] */ |
| s2 = objc_build_setter_call (argument, |
| build2 (MINUS_EXPR, TREE_TYPE (argument), |
| temp_variable_decl, increment)); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| /* This happens if building the setter failed because the property |
| is readonly. */ |
| if (s2 == error_mark_node) |
| return error_mark_node; |
| |
| SET_EXPR_LOCATION (s2, location); |
| |
| /* s3: __objc_property_temp */ |
| s3 = convert (TREE_TYPE (argument), temp_variable_decl); |
| |
| /* Now build the compound statement (s1, s2, s3) */ |
| compound_expr = build_compound_expr (location, build_compound_expr (location, s1, s2), s3); |
| |
| /* Prevent C++ from warning with -Wall that "right operand of comma |
| operator has no effect". */ |
| suppress_warning (compound_expr, OPT_Wunused); |
| return compound_expr; |
| } |
| |
| tree |
| objc_build_method_signature (bool is_class_method, tree rettype, tree selector, |
| tree optparms, bool ellipsis) |
| { |
| if (is_class_method) |
| return build_method_decl (CLASS_METHOD_DECL, rettype, selector, |
| optparms, ellipsis); |
| else |
| return build_method_decl (INSTANCE_METHOD_DECL, rettype, selector, |
| optparms, ellipsis); |
| } |
| |
| void |
| objc_add_method_declaration (bool is_class_method, tree decl, tree attributes) |
| { |
| if (!objc_interface_context) |
| { |
| /* PS: At the moment, due to how the parser works, it should be |
| impossible to get here. But it's good to have the check in |
| case the parser changes. |
| */ |
| fatal_error (input_location, |
| "method declaration not in @interface context"); |
| } |
| |
| if (flag_objc1_only && attributes) |
| error_at (input_location, "method attributes are not available in Objective-C 1.0"); |
| |
| objc_decl_method_attributes (&decl, attributes, 0); |
| objc_add_method (objc_interface_context, |
| decl, |
| is_class_method, |
| objc_method_optional_flag); |
| } |
| |
| /* Return 'true' if the method definition could be started, and |
| 'false' if not (because we are outside an @implementation context). |
| EXPR is NULL or an expression that needs to be evaluated for the |
| side effects of array size expressions in the parameters. |
| */ |
| bool |
| objc_start_method_definition (bool is_class_method, tree decl, tree attributes, |
| tree expr) |
| { |
| if (!objc_implementation_context) |
| { |
| error ("method definition not in @implementation context"); |
| return false; |
| } |
| |
| if (decl != NULL_TREE && METHOD_SEL_NAME (decl) == error_mark_node) |
| return false; |
| |
| #ifndef OBJCPLUS |
| /* Indicate no valid break/continue context. */ |
| in_statement = 0; |
| #endif |
| |
| if (attributes) |
| warning_at (input_location, 0, "method attributes cannot be specified in @implementation context"); |
| else |
| objc_decl_method_attributes (&decl, attributes, 0); |
| |
| objc_add_method (objc_implementation_context, |
| decl, |
| is_class_method, |
| /* is optional */ false); |
| start_method_def (decl, expr); |
| return true; |
| } |
| |
| void |
| objc_add_instance_variable (tree decl) |
| { |
| (void) add_instance_variable (objc_ivar_context, |
| objc_ivar_visibility, |
| decl); |
| } |
| |
| /* Construct a C struct with same name as KLASS, a base struct with tag |
| SUPER_NAME (if any), and FIELDS indicated. */ |
| |
| static tree |
| objc_build_struct (tree klass, tree fields, tree super_name) |
| { |
| tree name = CLASS_NAME (klass); |
| tree s = objc_start_struct (name); |
| tree super = (super_name ? xref_tag (RECORD_TYPE, super_name) : NULL_TREE); |
| tree t; |
| vec<tree> objc_info = vNULL; |
| int i; |
| |
| if (super) |
| { |
| /* Prepend a packed variant of the base class into the layout. This |
| is necessary to preserve ObjC ABI compatibility. */ |
| tree base = build_decl (input_location, |
| FIELD_DECL, NULL_TREE, super); |
| tree field = TYPE_FIELDS (super); |
| |
| while (field && DECL_CHAIN (field) |
| && TREE_CODE (DECL_CHAIN (field)) == FIELD_DECL) |
| field = DECL_CHAIN (field); |
| |
| /* For ObjC ABI purposes, the "packed" size of a base class is |
| the sum of the offset and the size (in bits) of the last field |
| in the class. */ |
| DECL_SIZE (base) |
| = (field && TREE_CODE (field) == FIELD_DECL |
| ? size_binop (PLUS_EXPR, |
| size_binop (PLUS_EXPR, |
| size_binop |
| (MULT_EXPR, |
| convert (bitsizetype, |
| DECL_FIELD_OFFSET (field)), |
| bitsize_int (BITS_PER_UNIT)), |
| DECL_FIELD_BIT_OFFSET (field)), |
| DECL_SIZE (field)) |
| : bitsize_zero_node); |
| DECL_SIZE_UNIT (base) |
| = size_binop (FLOOR_DIV_EXPR, convert (sizetype, DECL_SIZE (base)), |
| size_int (BITS_PER_UNIT)); |
| DECL_ARTIFICIAL (base) = 1; |
| SET_DECL_ALIGN (base, 1); |
| DECL_FIELD_CONTEXT (base) = s; |
| #ifdef OBJCPLUS |
| DECL_FIELD_IS_BASE (base) = 1; |
| |
| if (fields) |
| /* Suppress C++ ABI warnings: we are following the ObjC ABI here. */ |
| suppress_warning (fields, OPT_Wabi); |
| #endif |
| DECL_CHAIN (base) = fields; |
| fields = base; |
| } |
| |
| /* NB: Calling finish_struct() may cause type TYPE_OBJC_INFO |
| information in all variants of this RECORD_TYPE to be destroyed |
| (this is because the C frontend manipulates TYPE_LANG_SPECIFIC |
| for something else and then will change all variants to use the |
| same resulting TYPE_LANG_SPECIFIC, ignoring the fact that we use |
| it for ObjC protocols and that such propagation will make all |
| variants use the same objc_info), but it is therein that we store |
| protocol conformance info (e.g., 'NSObject <MyProtocol>'). |
| Hence, we must save the ObjC-specific information before calling |
| finish_struct(), and then reinstate it afterwards. */ |
| |
| for (t = TYPE_MAIN_VARIANT (s); t; t = TYPE_NEXT_VARIANT (t)) |
| { |
| INIT_TYPE_OBJC_INFO (t); |
| objc_info.safe_push (TYPE_OBJC_INFO (t)); |
| } |
| |
| s = objc_finish_struct (s, fields); |
| |
| for (i = 0, t = TYPE_MAIN_VARIANT (s); t; t = TYPE_NEXT_VARIANT (t), i++) |
| { |
| /* We now want to restore the different TYPE_OBJC_INFO, but we |
| have the additional problem that the C frontend doesn't just |
| copy TYPE_LANG_SPECIFIC from one variant to the other; it |
| actually makes all of them the *same* TYPE_LANG_SPECIFIC. As |
| we need a different TYPE_OBJC_INFO for each (and |
| TYPE_OBJC_INFO is a field in TYPE_LANG_SPECIFIC), we need to |
| make a copy of each TYPE_LANG_SPECIFIC before we modify |
| TYPE_OBJC_INFO. */ |
| if (TYPE_LANG_SPECIFIC (t)) |
| { |
| /* Create a copy of TYPE_LANG_SPECIFIC. */ |
| struct lang_type *old_lang_type = TYPE_LANG_SPECIFIC (t); |
| ALLOC_OBJC_TYPE_LANG_SPECIFIC (t); |
| memcpy (TYPE_LANG_SPECIFIC (t), old_lang_type, |
| SIZEOF_OBJC_TYPE_LANG_SPECIFIC); |
| } |
| else |
| { |
| /* Just create a new one. */ |
| ALLOC_OBJC_TYPE_LANG_SPECIFIC (t); |
| } |
| /* Replace TYPE_OBJC_INFO with the saved one. This restores any |
| protocol information that may have been associated with the |
| type. */ |
| TYPE_OBJC_INFO (t) = objc_info[i]; |
| /* Replace the IDENTIFIER_NODE with an actual @interface now |
| that we have it. */ |
| TYPE_OBJC_INTERFACE (t) = klass; |
| } |
| objc_info.release (); |
| |
| /* Use TYPE_BINFO structures to point at the super class, if any. */ |
| objc_xref_basetypes (s, super); |
| |
| /* Mark this struct as a class template. */ |
| CLASS_STATIC_TEMPLATE (klass) = s; |
| |
| return s; |
| } |
| |
| /* Mark DECL as being 'volatile' for purposes of Darwin |
| _setjmp()/_longjmp() exception handling. Called from |
| objc_mark_locals_volatile(). */ |
| void |
| objc_volatilize_decl (tree decl) |
| { |
| /* Do not mess with variables that are 'static' or (already) |
| 'volatile'. */ |
| if (!TREE_THIS_VOLATILE (decl) && !TREE_STATIC (decl) |
| && (TREE_CODE (decl) == VAR_DECL |
| || TREE_CODE (decl) == PARM_DECL)) |
| { |
| if (local_variables_to_volatilize == NULL) |
| vec_alloc (local_variables_to_volatilize, 8); |
| |
| vec_safe_push (local_variables_to_volatilize, decl); |
| } |
| } |
| |
| /* Called when parsing of a function completes; if any local variables |
| in the function were marked as variables to volatilize, change them |
| to volatile. We do this at the end of the function when the |
| warnings about discarding 'volatile' have already been produced. |
| We are making the variables as volatile just to force the compiler |
| to preserve them between setjmp/longjmp, but we don't want warnings |
| for them as they aren't really volatile. */ |
| void |
| objc_finish_function (void) |
| { |
| /* If there are any local variables to volatilize, volatilize them. */ |
| if (local_variables_to_volatilize) |
| { |
| int i; |
| tree decl; |
| FOR_EACH_VEC_ELT (*local_variables_to_volatilize, i, decl) |
| { |
| tree t = TREE_TYPE (decl); |
| |
| t = build_qualified_type (t, TYPE_QUALS (t) | TYPE_QUAL_VOLATILE); |
| TREE_TYPE (decl) = t; |
| TREE_THIS_VOLATILE (decl) = 1; |
| TREE_SIDE_EFFECTS (decl) = 1; |
| DECL_REGISTER (decl) = 0; |
| #ifndef OBJCPLUS |
| C_DECL_REGISTER (decl) = 0; |
| #endif |
| } |
| |
| /* Now we delete the vector. This sets it to NULL as well. */ |
| vec_free (local_variables_to_volatilize); |
| } |
| } |
| |
| /* Check if protocol PROTO is adopted (directly or indirectly) by class CLS |
| (including its categories and superclasses) or by object type TYP. |
| Issue a warning if PROTO is not adopted anywhere and WARN is set. */ |
| |
| static bool |
| objc_lookup_protocol (tree proto, tree cls, tree typ, bool warn) |
| { |
| bool class_type = (cls != NULL_TREE); |
| |
| while (cls) |
| { |
| tree c; |
| |
| /* Check protocols adopted by the class and its categories. */ |
| for (c = cls; c; c = CLASS_CATEGORY_LIST (c)) |
| { |
| if (lookup_protocol_in_reflist (CLASS_PROTOCOL_LIST (c), proto)) |
| return true; |
| } |
| |
| /* Repeat for superclasses. */ |
| cls = lookup_interface (CLASS_SUPER_NAME (cls)); |
| } |
| |
| /* Check for any protocols attached directly to the object type. */ |
| if (TYPE_HAS_OBJC_INFO (typ)) |
| { |
| if (lookup_protocol_in_reflist (TYPE_OBJC_PROTOCOL_LIST (typ), proto)) |
| return true; |
| } |
| |
| if (warn) |
| { |
| *errbuf = 0; |
| gen_type_name_0 (class_type ? typ : TYPE_POINTER_TO (typ)); |
| /* NB: Types 'id' and 'Class' cannot reasonably be described as |
| "implementing" a given protocol, since they do not have an |
| implementation. */ |
| if (class_type) |
| warning (0, "class %qs does not implement the %qE protocol", |
| identifier_to_locale (errbuf), PROTOCOL_NAME (proto)); |
| else |
| warning (0, "type %qs does not conform to the %qE protocol", |
| identifier_to_locale (errbuf), PROTOCOL_NAME (proto)); |
| } |
| |
| return false; |
| } |
| |
| /* Check if class RCLS and instance struct type RTYP conform to at least the |
| same protocols that LCLS and LTYP conform to. */ |
| |
| static bool |
| objc_compare_protocols (tree lcls, tree ltyp, tree rcls, tree rtyp, bool warn) |
| { |
| tree p; |
| bool have_lproto = false; |
| |
| while (lcls) |
| { |
| /* NB: We do _not_ look at categories defined for LCLS; these may or |
| may not get loaded in, and therefore it is unreasonable to require |
| that RCLS/RTYP must implement any of their protocols. */ |
| for (p = CLASS_PROTOCOL_LIST (lcls); p; p = TREE_CHAIN (p)) |
| { |
| have_lproto = true; |
| |
| if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn)) |
| return warn; |
| } |
| |
| /* Repeat for superclasses. */ |
| lcls = lookup_interface (CLASS_SUPER_NAME (lcls)); |
| } |
| |
| /* Check for any protocols attached directly to the object type. */ |
| if (TYPE_HAS_OBJC_INFO (ltyp)) |
| { |
| for (p = TYPE_OBJC_PROTOCOL_LIST (ltyp); p; p = TREE_CHAIN (p)) |
| { |
| have_lproto = true; |
| |
| if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn)) |
| return warn; |
| } |
| } |
| |
| /* NB: If LTYP and LCLS have no protocols to search for, return 'true' |
| vacuously, _unless_ RTYP is a protocol-qualified 'id'. We can get |
| away with simply checking for 'id' or 'Class' (!RCLS), since this |
| routine will not get called in other cases. */ |
| return have_lproto || (rcls != NULL_TREE); |
| } |
| |
| /* Given two types TYPE1 and TYPE2, return their least common ancestor. |
| Both TYPE1 and TYPE2 must be pointers, and already determined to be |
| compatible by objc_compare_types() below. */ |
| |
| tree |
| objc_common_type (tree type1, tree type2) |
| { |
| tree inner1 = TREE_TYPE (type1), inner2 = TREE_TYPE (type2); |
| |
| while (POINTER_TYPE_P (inner1)) |
| { |
| inner1 = TREE_TYPE (inner1); |
| inner2 = TREE_TYPE (inner2); |
| } |
| |
| /* If one type is derived from another, return the base type. */ |
| if (DERIVED_FROM_P (inner1, inner2)) |
| return type1; |
| else if (DERIVED_FROM_P (inner2, inner1)) |
| return type2; |
| |
| /* If both types are 'Class', return 'Class'. */ |
| if (objc_is_class_id (inner1) && objc_is_class_id (inner2)) |
| return objc_class_type; |
| |
| /* Otherwise, return 'id'. */ |
| return objc_object_type; |
| } |
| |
| /* Determine if it is permissible to assign (if ARGNO is greater than -3) |
| an instance of RTYP to an instance of LTYP or to compare the two |
| (if ARGNO is equal to -3), per ObjC type system rules. Before |
| returning 'true', this routine may issue warnings related to, e.g., |
| protocol conformance. When returning 'false', the routine must |
| produce absolutely no warnings; the C or C++ front-end will do so |
| instead, if needed. If either LTYP or RTYP is not an Objective-C |
| type, the routine must return 'false'. |
| |
| The ARGNO parameter is encoded as follows: |
| >= 1 Parameter number (CALLEE contains function being called); |
| 0 Return value; |
| -1 Assignment; |
| -2 Initialization; |
| -3 Comparison (LTYP and RTYP may match in either direction); |
| -4 Silent comparison (for C++ overload resolution); |
| -5 Silent "specialization" comparison for RTYP to be a "specialization" |
| of LTYP (a specialization means that RTYP is LTYP plus some constraints, |
| so that each object of type RTYP is also of type LTYP). This is used |
| when comparing property types. */ |
| |
| bool |
| objc_compare_types (tree ltyp, tree rtyp, int argno, tree callee) |
| { |
| tree lcls, rcls, lproto, rproto; |
| bool pointers_compatible; |
| |
| /* We must be dealing with pointer types */ |
| if (!POINTER_TYPE_P (ltyp) || !POINTER_TYPE_P (rtyp)) |
| return false; |
| |
| tree ltyp_attr, rtyp_attr; |
| do |
| { |
| /* Remove indirections, but keep the type attributes from the innermost |
| pointer type, to check for NSObject. */ |
| ltyp_attr = TYPE_ATTRIBUTES (ltyp); |
| ltyp = TREE_TYPE (ltyp); |
| rtyp_attr = TYPE_ATTRIBUTES (rtyp); |
| rtyp = TREE_TYPE (rtyp); |
| } |
| while (POINTER_TYPE_P (ltyp) && POINTER_TYPE_P (rtyp)); |
| |
| /* We must also handle function pointers, since ObjC is a bit more |
| lenient than C or C++ on this. */ |
| if (TREE_CODE (ltyp) == FUNCTION_TYPE && TREE_CODE (rtyp) == FUNCTION_TYPE) |
| { |
| function_args_iterator liter, riter; |
| |
| /* Return types must be covariant. */ |
| if (!comptypes (TREE_TYPE (ltyp), TREE_TYPE (rtyp)) |
| && !objc_compare_types (TREE_TYPE (ltyp), TREE_TYPE (rtyp), |
| argno, callee)) |
| return false; |
| |
| /* Argument types must be contravariant. */ |
| function_args_iter_init (&liter, ltyp); |
| function_args_iter_init (&riter, rtyp); |
| |
| while (1) |
| { |
| ltyp = function_args_iter_cond (&liter); |
| rtyp = function_args_iter_cond (&riter); |
| |
| /* If we've exhaused both lists simulateously, we're done. */ |
| if (ltyp == NULL_TREE && rtyp == NULL_TREE) |
| break; |
| |
| /* If one list is shorter than the other, they fail to match. */ |
| if (ltyp == NULL_TREE || rtyp == NULL_TREE) |
| return false; |
| |
| if (!comptypes (rtyp, ltyp) |
| && !objc_compare_types (rtyp, ltyp, argno, callee)) |
| return false; |
| |
| function_args_iter_next (&liter); |
| function_args_iter_next (&riter); |
| } |
| |
| return true; |
| } |
| |
| /* We might have void * with NSObject type attr. */ |
| bool l_NSObject_p = ltyp_attr && lookup_attribute ("NSObject", ltyp_attr); |
| bool r_NSObject_p = rtyp_attr && lookup_attribute ("NSObject", rtyp_attr); |
| |
| /* Past this point, we are only interested in ObjC class instances, |
| or 'id' or 'Class' (except if the user applied the NSObject type |
| attribute). */ |
| if ((TREE_CODE (ltyp) != RECORD_TYPE && !l_NSObject_p) |
| || (TREE_CODE (rtyp) != RECORD_TYPE && !r_NSObject_p)) |
| return false; |
| |
| if (!objc_is_object_id (ltyp) && !objc_is_class_id (ltyp) |
| && !TYPE_HAS_OBJC_INFO (ltyp) && !l_NSObject_p) |
| return false; |
| |
| if (!objc_is_object_id (rtyp) && !objc_is_class_id (rtyp) |
| && !TYPE_HAS_OBJC_INFO (rtyp) && !r_NSObject_p) |
| return false; |
| |
| /* Past this point, we are committed to returning 'true' to the caller |
| (unless performing a silent comparison; see below). However, we can |
| still warn about type and/or protocol mismatches. */ |
| |
| if (TYPE_HAS_OBJC_INFO (ltyp)) |
| { |
| lcls = TYPE_OBJC_INTERFACE (ltyp); |
| lproto = TYPE_OBJC_PROTOCOL_LIST (ltyp); |
| } |
| else |
| lcls = lproto = NULL_TREE; |
| |
| if (TYPE_HAS_OBJC_INFO (rtyp)) |
| { |
| rcls = TYPE_OBJC_INTERFACE (rtyp); |
| rproto = TYPE_OBJC_PROTOCOL_LIST (rtyp); |
| } |
| else |
| rcls = rproto = NULL_TREE; |
| |
| /* If we could not find an @interface declaration, we must have |
| only seen a @class declaration; for purposes of type comparison, |
| treat it as a stand-alone (root) class. */ |
| |
| if (lcls && TREE_CODE (lcls) == IDENTIFIER_NODE) |
| lcls = NULL_TREE; |
| |
| if (rcls && TREE_CODE (rcls) == IDENTIFIER_NODE) |
| rcls = NULL_TREE; |
| |
| /* If either type is an unqualified 'id', we're done. This is because |
| an 'id' can be assigned to or from any type with no warnings. When |
| the pointer has NSObject attribute, consider that to be equivalent. */ |
| if (argno != -5) |
| { |
| if ((!lproto && objc_is_object_id (ltyp)) |
| || (!rproto && objc_is_object_id (rtyp))) |
| return true; |
| if (l_NSObject_p || r_NSObject_p) |
| return true; |
| } |
| else |
| { |
| /* For property checks, though, an 'id' is considered the most |
| general type of object, hence if you try to specialize an |
| 'NSArray *' (ltyp) property with an 'id' (rtyp) one, we need |
| to warn. */ |
| if (!lproto && (objc_is_object_id (ltyp) || l_NSObject_p)) |
| return true; |
| } |
| |
| pointers_compatible = (TYPE_MAIN_VARIANT (ltyp) == TYPE_MAIN_VARIANT (rtyp)); |
| |
| /* If the underlying types are the same, and at most one of them has |
| a protocol list, we do not need to issue any diagnostics. */ |
| if (pointers_compatible && (!lproto || !rproto)) |
| return true; |
| |
| /* If exactly one of the types is 'Class', issue a diagnostic; any |
| exceptions of this rule have already been handled. */ |
| if (objc_is_class_id (ltyp) ^ objc_is_class_id (rtyp)) |
| pointers_compatible = false; |
| /* Otherwise, check for inheritance relations. */ |
| else |
| { |
| if (!pointers_compatible) |
| { |
| /* Again, if any of the two is an 'id', we're satisfied, |
| unless we're comparing properties, in which case only an |
| 'id' on the left-hand side (old property) is good |
| enough. */ |
| if (argno != -5) |
| pointers_compatible |
| = (objc_is_object_id (ltyp) || objc_is_object_id (rtyp)); |
| else |
| pointers_compatible = objc_is_object_id (ltyp); |
| } |
| |
| if (!pointers_compatible) |
| pointers_compatible = DERIVED_FROM_P (ltyp, rtyp); |
| |
| if (!pointers_compatible && (argno == -3 || argno == -4)) |
| pointers_compatible = DERIVED_FROM_P (rtyp, ltyp); |
| } |
| |
| /* If the pointers match modulo protocols, check for protocol conformance |
| mismatches. */ |
| if (pointers_compatible) |
| { |
| pointers_compatible = objc_compare_protocols (lcls, ltyp, rcls, rtyp, |
| argno != -3); |
| |
| if (!pointers_compatible && argno == -3) |
| pointers_compatible = objc_compare_protocols (rcls, rtyp, lcls, ltyp, |
| argno != -3); |
| } |
| |
| if (!pointers_compatible) |
| { |
| /* The two pointers are not exactly compatible. Issue a warning, unless |
| we are performing a silent comparison, in which case return 'false' |
| instead. */ |
| /* NB: For the time being, we shall make our warnings look like their |
| C counterparts. In the future, we may wish to make them more |
| ObjC-specific. */ |
| switch (argno) |
| { |
| case -5: |
| case -4: |
| return false; |
| |
| case -3: |
| warning (0, "comparison of distinct Objective-C types lacks a cast"); |
| break; |
| |
| case -2: |
| warning (0, "initialization from distinct Objective-C type"); |
| break; |
| |
| case -1: |
| warning (0, "assignment from distinct Objective-C type"); |
| break; |
| |
| case 0: |
| warning (0, "distinct Objective-C type in return"); |
| break; |
| |
| default: |
| warning (0, "passing argument %d of %qE from distinct " |
| "Objective-C type", argno, callee); |
| break; |
| } |
| } |
| |
| return true; |
| } |
| |
| /* This routine is similar to objc_compare_types except that function-pointers are |
| excluded. This is because, caller assumes that common types are of (id, Object*) |
| variety and calls objc_common_type to obtain a common type. There is no commonolty |
| between two function-pointers in this regard. */ |
| |
| bool |
| objc_have_common_type (tree ltyp, tree rtyp, int argno, tree callee) |
| { |
| if (objc_compare_types (ltyp, rtyp, argno, callee)) |
| { |
| /* exclude function-pointer types. */ |
| do |
| { |
| ltyp = TREE_TYPE (ltyp); /* Remove indirections. */ |
| rtyp = TREE_TYPE (rtyp); |
| } |
| while (POINTER_TYPE_P (ltyp) && POINTER_TYPE_P (rtyp)); |
| return !(TREE_CODE (ltyp) == FUNCTION_TYPE && TREE_CODE (rtyp) == FUNCTION_TYPE); |
| } |
| return false; |
| } |
| |
| #ifndef OBJCPLUS |
| /* Determine if CHILD is derived from PARENT. The routine assumes that |
| both parameters are RECORD_TYPEs, and is non-reflexive. */ |
| |
| static bool |
| objc_derived_from_p (tree parent, tree child) |
| { |
| parent = TYPE_MAIN_VARIANT (parent); |
| |
| for (child = TYPE_MAIN_VARIANT (child); |
| TYPE_BINFO (child) && BINFO_N_BASE_BINFOS (TYPE_BINFO (child));) |
| { |
| child = TYPE_MAIN_VARIANT (BINFO_TYPE (BINFO_BASE_BINFO |
| (TYPE_BINFO (child), |
| 0))); |
| |
| if (child == parent) |
| return true; |
| } |
| |
| return false; |
| } |
| #endif |
| |
| tree |
| objc_build_component_ref (tree datum, tree component) |
| { |
| /* If COMPONENT is NULL, the caller is referring to the anonymous |
| base class field. */ |
| if (!component) |
| { |
| tree base = TYPE_FIELDS (TREE_TYPE (datum)); |
| |
| return build3 (COMPONENT_REF, TREE_TYPE (base), datum, base, NULL_TREE); |
| } |
| |
| /* The 'build_component_ref' routine has been removed from the C++ |
| front-end, but 'finish_class_member_access_expr' seems to be |
| a worthy substitute. */ |
| #ifdef OBJCPLUS |
| return finish_class_member_access_expr (datum, component, false, |
| tf_warning_or_error); |
| #else |
| return build_component_ref (input_location, datum, component, |
| UNKNOWN_LOCATION); |
| #endif |
| } |
| |
| /* Recursively copy inheritance information rooted at BINFO. To do this, |
| we emulate the song and dance performed by cp/tree.cc:copy_binfo(). */ |
| |
| static tree |
| objc_copy_binfo (tree binfo) |
| { |
| tree btype = BINFO_TYPE (binfo); |
| tree binfo2 = make_tree_binfo (BINFO_N_BASE_BINFOS (binfo)); |
| tree base_binfo; |
| int ix; |
| |
| BINFO_TYPE (binfo2) = btype; |
| BINFO_OFFSET (binfo2) = BINFO_OFFSET (binfo); |
| BINFO_BASE_ACCESSES (binfo2) = BINFO_BASE_ACCESSES (binfo); |
| |
| /* Recursively copy base binfos of BINFO. */ |
| for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) |
| { |
| tree base_binfo2 = objc_copy_binfo (base_binfo); |
| |
| BINFO_INHERITANCE_CHAIN (base_binfo2) = binfo2; |
| BINFO_BASE_APPEND (binfo2, base_binfo2); |
| } |
| |
| return binfo2; |
| } |
| |
| /* Record superclass information provided in BASETYPE for ObjC class REF. |
| This is loosely based on cp/decl.cc:xref_basetypes(). */ |
| |
| static void |
| objc_xref_basetypes (tree ref, tree basetype) |
| { |
| tree variant; |
| tree binfo = make_tree_binfo (basetype ? 1 : 0); |
| TYPE_BINFO (ref) = binfo; |
| BINFO_OFFSET (binfo) = size_zero_node; |
| BINFO_TYPE (binfo) = ref; |
| |
| gcc_assert (TYPE_MAIN_VARIANT (ref) == ref); |
| for (variant = ref; variant; variant = TYPE_NEXT_VARIANT (variant)) |
| TYPE_BINFO (variant) = binfo; |
| |
| if (basetype) |
| { |
| tree base_binfo = objc_copy_binfo (TYPE_BINFO (basetype)); |
| |
| BINFO_INHERITANCE_CHAIN (base_binfo) = binfo; |
| vec_alloc (BINFO_BASE_ACCESSES (binfo), 1); |
| BINFO_BASE_APPEND (binfo, base_binfo); |
| BINFO_BASE_ACCESS_APPEND (binfo, access_public_node); |
| } |
| } |
| |
| /* Called from finish_decl. */ |
| |
| void |
| objc_check_decl (tree decl) |
| { |
| tree type = TREE_TYPE (decl); |
| |
| if (TREE_CODE (type) != RECORD_TYPE) |
| return; |
| if (OBJC_TYPE_NAME (type) && (type = objc_is_class_name (OBJC_TYPE_NAME (type)))) |
| error ("statically allocated instance of Objective-C class %qE", |
| type); |
| } |
| |
| void |
| objc_check_global_decl (tree decl) |
| { |
| tree id = DECL_NAME (decl); |
| if (objc_is_class_name (id) && global_bindings_p()) |
| error ("redeclaration of Objective-C class %qs", IDENTIFIER_POINTER (id)); |
| } |
| |
| /* Construct a PROTOCOLS-qualified variant of INTERFACE, where |
| INTERFACE may either name an Objective-C class, or refer to the |
| special 'id' or 'Class' types. If INTERFACE is not a valid ObjC |
| type, just return it unchanged. This function is often called when |
| PROTOCOLS is NULL_TREE, in which case we simply look up the |
| appropriate INTERFACE. */ |
| |
| tree |
| objc_get_protocol_qualified_type (tree interface, tree protocols) |
| { |
| /* If INTERFACE is not provided, default to 'id'. */ |
| tree type = (interface ? objc_is_id (interface) : objc_object_type); |
| bool is_ptr = (type != NULL_TREE); |
| |
| if (!is_ptr) |
| { |
| type = objc_is_class_name (interface); |
| |
| if (type) |
| { |
| /* If looking at a typedef, retrieve the precise type it |
| describes. */ |
| if (TREE_CODE (interface) == IDENTIFIER_NODE) |
| interface = identifier_global_value (interface); |
| |
| type = ((interface && TREE_CODE (interface) == TYPE_DECL |
| && DECL_ORIGINAL_TYPE (interface)) |
| ? DECL_ORIGINAL_TYPE (interface) |
| : xref_tag (RECORD_TYPE, type)); |
| } |
| else |
| { |
| /* This case happens when we are given an 'interface' which |
| is not a valid class name. For example if a typedef was |
| used, and 'interface' really is the identifier of the |
| typedef, but when you resolve it you don't get an |
| Objective-C class, but something else, such as 'int'. |
| This is an error; protocols make no sense unless you use |
| them with Objective-C objects. */ |
| error_at (input_location, "only Objective-C object types can be qualified with a protocol"); |
| |
| /* Try to recover. Ignore the invalid class name, and treat |
| the object as an 'id' to silence further warnings about |
| the class. */ |
| type = objc_object_type; |
| is_ptr = true; |
| } |
| } |
| |
| if (protocols) |
| { |
| type = build_variant_type_copy (type); |
| |
| /* For pointers (i.e., 'id' or 'Class'), attach the protocol(s) |
| to the pointee. */ |
| if (is_ptr) |
| { |
| tree orig_pointee_type = TREE_TYPE (type); |
| TREE_TYPE (type) = build_variant_type_copy (orig_pointee_type); |
| |
| /* Set up the canonical type information. */ |
| TYPE_CANONICAL (type) |
| = TYPE_CANONICAL (TYPE_POINTER_TO (orig_pointee_type)); |
| |
| TYPE_POINTER_TO (TREE_TYPE (type)) = type; |
| type = TREE_TYPE (type); |
| } |
| |
| /* Look up protocols and install in lang specific list. */ |
| DUP_TYPE_OBJC_INFO (type, TYPE_MAIN_VARIANT (type)); |
| TYPE_OBJC_PROTOCOL_LIST (type) = lookup_and_install_protocols |
| (protocols, /* definition_required */ false); |
| |
| /* For RECORD_TYPEs, point to the @interface; for 'id' and 'Class', |
| return the pointer to the new pointee variant. */ |
| if (is_ptr) |
| type = TYPE_POINTER_TO (type); |
| else |
| TYPE_OBJC_INTERFACE (type) |
| = TYPE_OBJC_INTERFACE (TYPE_MAIN_VARIANT (type)); |
| } |
| |
| return type; |
| } |
| |
| /* Check for circular dependencies in protocols. The arguments are |
| PROTO, the protocol to check, and LIST, a list of protocol it |
| conforms to. */ |
| |
| static void |
| check_protocol_recursively (tree proto, tree list) |
| { |
| tree p; |
| |
| for (p = list; p; p = TREE_CHAIN (p)) |
| { |
| tree pp = TREE_VALUE (p); |
| |
| if (TREE_CODE (pp) == IDENTIFIER_NODE) |
| pp = lookup_protocol (pp, /* warn if deprecated */ false, |
| /* definition_required */ false); |
| |
| if (pp == proto) |
| fatal_error (input_location, "protocol %qE has circular dependency", |
| PROTOCOL_NAME (pp)); |
| if (pp) |
| check_protocol_recursively (proto, PROTOCOL_LIST (pp)); |
| } |
| } |
| |
| /* Look up PROTOCOLS, and return a list of those that are found. If |
| none are found, return NULL. Note that this function will emit a |
| warning if a protocol is found and is deprecated. If |
| 'definition_required', then warn if the protocol is found but is |
| not defined (ie, if we only saw a forward-declaration of the |
| protocol (as in "@protocol NSObject;") not a real definition with |
| the list of methods). */ |
| static tree |
| lookup_and_install_protocols (tree protocols, bool definition_required) |
| { |
| tree proto; |
| tree return_value = NULL_TREE; |
| |
| if (protocols == error_mark_node) |
| return NULL; |
| |
| for (proto = protocols; proto; proto = TREE_CHAIN (proto)) |
| { |
| tree ident = TREE_VALUE (proto); |
| tree p = lookup_protocol (ident, /* warn_if_deprecated */ true, |
| definition_required); |
| |
| if (p) |
| return_value = chainon (return_value, |
| build_tree_list (NULL_TREE, p)); |
| else if (ident != error_mark_node) |
| error ("cannot find protocol declaration for %qE", |
| ident); |
| } |
| |
| return return_value; |
| } |
| |
| static void |
| build_common_objc_exception_stuff (void) |
| { |
| tree noreturn_list, nothrow_list, temp_type; |
| |
| noreturn_list = tree_cons (get_identifier ("noreturn"), NULL, NULL); |
| nothrow_list = tree_cons (get_identifier ("nothrow"), NULL, NULL); |
| |
| /* void objc_exception_throw(id) __attribute__((noreturn)); */ |
| /* void objc_sync_enter(id); */ |
| /* void objc_sync_exit(id); */ |
| temp_type = build_function_type_list (void_type_node, |
| objc_object_type, |
| NULL_TREE); |
| objc_exception_throw_decl |
| = add_builtin_function (TAG_EXCEPTIONTHROW, temp_type, 0, NOT_BUILT_IN, NULL, |
| noreturn_list); |
| /* Make sure that objc_exception_throw (id) claims that it may throw an |
| exception. */ |
| TREE_NOTHROW (objc_exception_throw_decl) = 0; |
| |
| objc_sync_enter_decl |
| = add_builtin_function (TAG_SYNCENTER, temp_type, 0, NOT_BUILT_IN, |
| NULL, nothrow_list); |
| |
| objc_sync_exit_decl |
| = add_builtin_function (TAG_SYNCEXIT, temp_type, 0, NOT_BUILT_IN, |
| NULL, nothrow_list); |
| } |
| |
| /* Purpose: "play" parser, creating/installing representations |
| of the declarations that are required by Objective-C. |
| |
| Model: |
| |
| type_spec--------->sc_spec |
| (tree_list) (tree_list) |
| | | |
| | | |
| identifier_node identifier_node */ |
| |
| static void |
| synth_module_prologue (void) |
| { |
| tree type; |
| uint32_t save_write_symbols = write_symbols; |
| const struct gcc_debug_hooks *const save_hooks = debug_hooks; |
| |
| /* Suppress outputting debug symbols, because |
| dbxout_init hasn't been called yet. */ |
| write_symbols = NO_DEBUG; |
| debug_hooks = &do_nothing_debug_hooks; |
| |
| #ifdef OBJCPLUS |
| push_lang_context (lang_name_c); /* extern "C" */ |
| #endif |
| |
| /* The following are also defined in <objc/objc.h> and friends. */ |
| |
| objc_object_id = get_identifier (TAG_OBJECT); |
| objc_class_id = get_identifier (TAG_CLASS); |
| |
| objc_object_reference = xref_tag (RECORD_TYPE, objc_object_id); |
| objc_class_reference = xref_tag (RECORD_TYPE, objc_class_id); |
| |
| objc_object_type = build_pointer_type (objc_object_reference); |
| objc_instancetype_type = build_pointer_type (objc_object_reference); |
| objc_class_type = build_pointer_type (objc_class_reference); |
| |
| objc_object_name = get_identifier (OBJECT_TYPEDEF_NAME); |
| objc_instancetype_name = get_identifier (INSTANCE_TYPEDEF_NAME); |
| objc_class_name = get_identifier (CLASS_TYPEDEF_NAME); |
| objc_selector_name = get_identifier (SEL_TYPEDEF_NAME); |
| |
| /* Declare the 'id', 'instancetype' and 'Class' typedefs. */ |
| type = lang_hooks.decls.pushdecl (build_decl (input_location, |
| TYPE_DECL, |
| objc_object_name, |
| objc_object_type)); |
| suppress_warning (type); |
| |
| type = lang_hooks.decls.pushdecl (build_decl (input_location, |
| TYPE_DECL, |
| objc_instancetype_name, |
| objc_instancetype_type)); |
| suppress_warning (type); |
| |
| type = lang_hooks.decls.pushdecl (build_decl (input_location, |
| TYPE_DECL, |
| objc_class_name, |
| objc_class_type)); |
| suppress_warning (type); |
| |
| /* Forward-declare '@interface Protocol'. */ |
| type = get_identifier (PROTOCOL_OBJECT_CLASS_NAME); |
| objc_declare_class (type); |
| objc_protocol_type = build_pointer_type (xref_tag (RECORD_TYPE, type)); |
| |
| /* Declare receiver type used for dispatching messages to 'super'. */ |
| /* `struct objc_super *' */ |
| objc_super_type = build_pointer_type (xref_tag (RECORD_TYPE, |
| get_identifier (TAG_SUPER))); |
| |
| /* Declare pointers to method and ivar lists. */ |
| objc_method_list_ptr = build_pointer_type |
| (xref_tag (RECORD_TYPE, |
| get_identifier (UTAG_METHOD_LIST))); |
| objc_method_proto_list_ptr |
| = build_pointer_type (xref_tag (RECORD_TYPE, |
| get_identifier (UTAG_METHOD_PROTOTYPE_LIST))); |
| objc_ivar_list_ptr = build_pointer_type |
| (xref_tag (RECORD_TYPE, |
| get_identifier (UTAG_IVAR_LIST))); |
| |
| build_common_objc_exception_stuff (); |
| |
| /* Set-up runtime-specific templates, message and exception stuff. */ |
| (*runtime.initialize) (); |
| |
| /* Declare objc_getProperty, object_setProperty and other property |
| accessor helpers. */ |
| build_common_objc_property_accessor_helpers (); |
| |
| /* Forward declare constant_string_id and constant_string_type. */ |
| if (!constant_string_class_name) |
| constant_string_class_name = runtime.default_constant_string_class_name; |
| constant_string_id = get_identifier (constant_string_class_name); |
| objc_declare_class (constant_string_id); |
| |
| /* Pre-build the following entities - for speed/convenience. */ |
| self_id = get_identifier ("self"); |
| ucmd_id = get_identifier ("_cmd"); |
| |
| /* Declare struct _objc_fast_enumeration_state { ... }; */ |
| build_fast_enumeration_state_template (); |
| |
| /* void objc_enumeration_mutation (id) */ |
| type = build_function_type_list (void_type_node, |
| objc_object_type, NULL_TREE); |
| objc_enumeration_mutation_decl |
| = add_builtin_function (TAG_ENUMERATION_MUTATION, type, 0, NOT_BUILT_IN, |
| NULL, NULL_TREE); |
| TREE_NOTHROW (objc_enumeration_mutation_decl) = 0; |
| |
| #ifdef OBJCPLUS |
| pop_lang_context (); |
| #endif |
| |
| write_symbols = save_write_symbols; |
| debug_hooks = save_hooks; |
| } |
| |
| /* --- const strings --- */ |
| |
| /* Ensure that the ivar list for NSConstantString/NXConstantString |
| (or whatever was specified via `-fconstant-string-class') |
| contains fields at least as large as the following three, so that |
| the runtime can stomp on them with confidence: |
| |
| struct STRING_OBJECT_CLASS_NAME |
| { |
| Object isa; |
| char *cString; |
| unsigned int length; |
| }; */ |
| |
| static int |
| check_string_class_template (void) |
| { |
| tree field_decl = objc_get_class_ivars (constant_string_id); |
| |
| #define AT_LEAST_AS_LARGE_AS(F, T) \ |
| (F && TREE_CODE (F) == FIELD_DECL \ |
| && (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (F))) \ |
| >= TREE_INT_CST_LOW (TYPE_SIZE (T)))) |
| |
| if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node)) |
| return 0; |
| |
| field_decl = DECL_CHAIN (field_decl); |
| if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node)) |
| return 0; |
| |
| field_decl = DECL_CHAIN (field_decl); |
| return AT_LEAST_AS_LARGE_AS (field_decl, unsigned_type_node); |
| |
| #undef AT_LEAST_AS_LARGE_AS |
| } |
| |
| /* Avoid calling `check_string_class_template ()' more than once. */ |
| static GTY(()) int string_layout_checked; |
| |
| /* Construct an internal string layout to be used as a template for |
| creating NSConstantString/NXConstantString instances. */ |
| |
| static tree |
| objc_build_internal_const_str_type (void) |
| { |
| tree type = (*lang_hooks.types.make_type) (RECORD_TYPE); |
| tree fields = build_decl (input_location, |
| FIELD_DECL, NULL_TREE, ptr_type_node); |
| tree field = build_decl (input_location, |
| FIELD_DECL, NULL_TREE, ptr_type_node); |
| |
| DECL_CHAIN (field) = fields; fields = field; |
| field = build_decl (input_location, |
| FIELD_DECL, NULL_TREE, unsigned_type_node); |
| DECL_CHAIN (field) = fields; fields = field; |
| /* NB: The finish_builtin_struct() routine expects FIELD_DECLs in |
| reverse order! */ |
| finish_builtin_struct (type, "__builtin_ObjCString", |
| fields, NULL_TREE); |
| |
| return type; |
| } |
| |
| /* Custom build_string which sets TREE_TYPE! */ |
| |
| tree |
| my_build_string (int len, const char *str) |
| { |
| return fix_string_type (build_string (len, str)); |
| } |
| |
| /* Build a string with contents STR and length LEN and convert it to a |
| pointer. */ |
| |
| tree |
| my_build_string_pointer (int len, const char *str) |
| { |
| tree string = my_build_string (len, str); |
| tree ptrtype = build_pointer_type (TREE_TYPE (TREE_TYPE (string))); |
| return build1 (ADDR_EXPR, ptrtype, string); |
| } |
| |
| hashval_t |
| objc_string_hasher::hash (string_descriptor *ptr) |
| { |
| const_tree const str = ptr->literal; |
| const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str); |
| int i, len = TREE_STRING_LENGTH (str); |
| hashval_t h = len; |
| |
| for (i = 0; i < len; i++) |
| h = ((h * 613) + p[i]); |
| |
| return h; |
| } |
| |
| bool |
| objc_string_hasher::equal (string_descriptor *ptr1, string_descriptor *ptr2) |
| { |
| const_tree const str1 = ptr1->literal; |
| const_tree const str2 = ptr2->literal; |
| int len1 = TREE_STRING_LENGTH (str1); |
| |
| return (len1 == TREE_STRING_LENGTH (str2) |
| && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2), |
| len1)); |
| } |
| |
| /* Given a chain of STRING_CST's, build a static instance of |
| NXConstantString which points at the concatenation of those |
| strings. We place the string object in the __string_objects |
| section of the __OBJC segment. The Objective-C runtime will |
| initialize the isa pointers of the string objects to point at the |
| NXConstantString class object. */ |
| |
| tree |
| objc_build_string_object (tree string) |
| { |
| tree constant_string_class; |
| int length; |
| tree addr; |
| struct string_descriptor *desc, key; |
| |
| /* We should be passed a STRING_CST. */ |
| gcc_checking_assert (TREE_CODE (string) == STRING_CST); |
| length = TREE_STRING_LENGTH (string) - 1; |
| |
| /* The target may have different ideas on how to construct an ObjC string |
| literal. On Darwin (Mac OS X), for example, we may wish to obtain a |
| constant CFString reference instead. |
| At present, this is only supported for the NeXT runtime. */ |
| if (flag_next_runtime |
| && targetcm.objc_construct_string_object) |
| { |
| tree constructor = (*targetcm.objc_construct_string_object) (string); |
| if (constructor) |
| return build1 (NOP_EXPR, objc_object_type, constructor); |
| } |
| |
| /* Check whether the string class being used actually exists and has the |
| correct ivar layout. */ |
| if (!string_layout_checked) |
| { |
| string_layout_checked = -1; |
| constant_string_class = lookup_interface (constant_string_id); |
| internal_const_str_type = objc_build_internal_const_str_type (); |
| |
| if (!constant_string_class |
| || !(constant_string_type |
| = CLASS_STATIC_TEMPLATE (constant_string_class))) |
| error ("cannot find interface declaration for %qE", |
| constant_string_id); |
| /* The NSConstantString/NXConstantString ivar layout is now known. */ |
| else if (!check_string_class_template ()) |
| error ("interface %qE does not have valid constant string layout", |
| constant_string_id); |
| /* If the runtime can generate a literal reference to the string class, |
| don't need to run a constructor. */ |
| else if (!(*runtime.setup_const_string_class_decl)()) |
| error ("cannot find reference tag for class %qE", constant_string_id); |
| else |
| { |
| string_layout_checked = 1; /* Success! */ |
| add_class_reference (constant_string_id); |
| } |
| } |
| |
| if (string_layout_checked == -1) |
| return error_mark_node; |
| |
| /* Perhaps we already constructed a constant string just like this one? */ |
| key.literal = string; |
| string_descriptor **loc = string_htab->find_slot (&key, INSERT); |
| desc = *loc; |
| |
| if (!desc) |
| { |
| *loc = desc = ggc_alloc<string_descriptor> (); |
| desc->literal = string; |
| desc->constructor = |
| (*runtime.build_const_string_constructor) (input_location, string, length); |
| } |
| |
| addr = convert (build_pointer_type (constant_string_type), |
| build_unary_op (input_location, |
| ADDR_EXPR, desc->constructor, 1)); |
| |
| return addr; |
| } |
| |
| /* Build a static constant CONSTRUCTOR with type TYPE and elements ELTS. |
| We might be presented with a NULL for ELTS, which means 'empty ctor' |
| which will subsequently be converted into a zero initializer in the |
| middle end. */ |
| |
| tree |
| objc_build_constructor (tree type, vec<constructor_elt, va_gc> *elts) |
| { |
| tree constructor = build_constructor (type, elts); |
| |
| TREE_CONSTANT (constructor) = 1; |
| TREE_STATIC (constructor) = 1; |
| TREE_READONLY (constructor) = 1; |
| |
| #ifdef OBJCPLUS |
| /* If we know the initializer, then set the type to what C++ expects. */ |
| if (elts && !(*elts)[0].index) |
| TREE_TYPE (constructor) = init_list_type_node; |
| #endif |
| return constructor; |
| } |
| |
| /* Return the DECL of the string IDENT in the SECTION. */ |
| |
| tree |
| get_objc_string_decl (tree ident, enum string_section section) |
| { |
| tree chain; |
| |
| switch (section) |
| { |
| case class_names: |
| chain = class_names_chain; |
| break; |
| case meth_var_names: |
| chain = meth_var_names_chain; |
| break; |
| case meth_var_types: |
| chain = meth_var_types_chain; |
| break; |
| case prop_names_attr: |
| chain = prop_names_attr_chain; |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| for (; chain != 0; chain = TREE_CHAIN (chain)) |
| if (TREE_VALUE (chain) == ident) |
| return (TREE_PURPOSE (chain)); |
| |
| /* We didn't find the entry. */ |
| return NULL_TREE; |
| } |
| |
| /* Create a class reference, but don't create a variable to reference |
| it. */ |
| |
| void |
| add_class_reference (tree ident) |
| { |
| tree chain; |
| |
| if ((chain = cls_ref_chain)) |
| { |
| tree tail; |
| do |
| { |
| if (ident == TREE_VALUE (chain)) |
| return; |
| |
| tail = chain; |
| chain = TREE_CHAIN (chain); |
| } |
| while (chain); |
| |
| /* Append to the end of the list */ |
| TREE_CHAIN (tail) = tree_cons (NULL_TREE, ident, NULL_TREE); |
| } |
| else |
| cls_ref_chain = tree_cons (NULL_TREE, ident, NULL_TREE); |
| } |
| |
| /* Get a class reference, creating it if necessary. Also create the |
| reference variable. */ |
| tree |
| objc_get_class_reference (tree ident) |
| { |
| tree orig_ident = (DECL_P (ident) |
| ? DECL_NAME (ident) |
| : TYPE_P (ident) |
| ? OBJC_TYPE_NAME (ident) |
| : ident); |
| bool local_scope = false; |
| |
| #ifdef OBJCPLUS |
| if (processing_template_decl) |
| /* Must wait until template instantiation time. */ |
| return build_min_nt_loc (UNKNOWN_LOCATION, CLASS_REFERENCE_EXPR, ident); |
| #endif |
| |
| if (TREE_CODE (ident) == TYPE_DECL) |
| ident = (DECL_ORIGINAL_TYPE (ident) |
| ? DECL_ORIGINAL_TYPE (ident) |
| : TREE_TYPE (ident)); |
| |
| #ifdef OBJCPLUS |
| if (TYPE_P (ident) |
| && CP_TYPE_CONTEXT (ident) != global_namespace) |
| local_scope = true; |
| #endif |
| |
| if (local_scope || !(ident = objc_is_class_name (ident))) |
| { |
| error ("%qE is not an Objective-C class name or alias", |
| orig_ident); |
| return error_mark_node; |
| } |
| |
| return (*runtime.get_class_reference) (ident); |
| } |
| |
| void |
| objc_declare_alias (tree alias_ident, tree class_ident) |
| { |
| tree underlying_class; |
| |
| #ifdef OBJCPLUS |
| if (current_namespace != global_namespace) { |
| error ("Objective-C declarations may only appear in global scope"); |
| } |
| #endif /* OBJCPLUS */ |
| |
| if (!(underlying_class = objc_is_class_name (class_ident))) |
| warning (0, "cannot find class %qE", class_ident); |
| else if (objc_is_class_name (alias_ident)) |
| warning (0, "class %qE already exists", alias_ident); |
| else |
| { |
| /* Implement @compatibility_alias as a typedef. */ |
| #ifdef OBJCPLUS |
| push_lang_context (lang_name_c); /* extern "C" */ |
| #endif |
| lang_hooks.decls.pushdecl (build_decl |
| (input_location, |
| TYPE_DECL, |
| alias_ident, |
| xref_tag (RECORD_TYPE, underlying_class))); |
| #ifdef OBJCPLUS |
| pop_lang_context (); |
| #endif |
| objc_map_put (alias_name_map, alias_ident, underlying_class); |
| } |
| } |
| |
| void |
| objc_declare_class (tree identifier) |
| { |
| #ifdef OBJCPLUS |
| if (current_namespace != global_namespace) { |
| error ("Objective-C declarations may only appear in global scope"); |
| } |
| #endif /* OBJCPLUS */ |
| |
| if (! objc_is_class_name (identifier)) |
| { |
| tree record = lookup_name (identifier), type = record; |
| |
| if (record) |
| { |
| if (TREE_CODE (record) == TYPE_DECL) |
| type = DECL_ORIGINAL_TYPE (record) |
| ? DECL_ORIGINAL_TYPE (record) |
| : TREE_TYPE (record); |
| |
| if (!TYPE_HAS_OBJC_INFO (type) |
| || !TYPE_OBJC_INTERFACE (type)) |
| { |
| error ("%qE redeclared as different kind of symbol", |
| identifier); |
| error ("previous declaration of %q+D", |
| record); |
| } |
| } |
| |
| record = xref_tag (RECORD_TYPE, identifier); |
| INIT_TYPE_OBJC_INFO (record); |
| /* In the case of a @class declaration, we store the ident in |
| the TYPE_OBJC_INTERFACE. If later an @interface is found, |
| we'll replace the ident with the interface. */ |
| TYPE_OBJC_INTERFACE (record) = identifier; |
| objc_map_put (class_name_map, identifier, NULL_TREE); |
| } |
| } |
| |
| tree |
| objc_is_class_name (tree ident) |
| { |
| if (ident && TREE_CODE (ident) == IDENTIFIER_NODE) |
| { |
| tree t = identifier_global_value (ident); |
| if (t) |
| ident = t; |
| } |
| |
| while (ident && TREE_CODE (ident) == TYPE_DECL && DECL_ORIGINAL_TYPE (ident)) |
| ident = OBJC_TYPE_NAME (DECL_ORIGINAL_TYPE (ident)); |
| |
| if (ident && TREE_CODE (ident) == RECORD_TYPE) |
| ident = OBJC_TYPE_NAME (ident); |
| #ifdef OBJCPLUS |
| if (ident && TREE_CODE (ident) == TYPE_DECL) |
| { |
| tree type = TREE_TYPE (ident); |
| if (type && TREE_CODE (type) == TEMPLATE_TYPE_PARM) |
| return NULL_TREE; |
| ident = DECL_NAME (ident); |
| } |
| #endif |
| if (!ident || TREE_CODE (ident) != IDENTIFIER_NODE) |
| return NULL_TREE; |
| |
| if (lookup_interface (ident)) |
| return ident; |
| |
| { |
| tree target; |
| |
| target = objc_map_get (class_name_map, ident); |
| if (target != OBJC_MAP_NOT_FOUND) |
| return ident; |
| |
| target = objc_map_get (alias_name_map, ident); |
| if (target != OBJC_MAP_NOT_FOUND) |
| return target; |
| } |
| |
| return 0; |
| } |
| |
| /* Check whether TYPE is either 'id' or 'Class'. */ |
| |
| tree |
| objc_is_id (tree type) |
| { |
| if (type && TREE_CODE (type) == IDENTIFIER_NODE) |
| { |
| tree t = identifier_global_value (type); |
| if (t) |
| type = t; |
| } |
| |
| if (type && TREE_CODE (type) == TYPE_DECL) |
| type = TREE_TYPE (type); |
| |
| /* NB: This function may be called before the ObjC front-end has |
| been initialized, in which case OBJC_OBJECT_TYPE will (still) be NULL. */ |
| return (objc_object_type && type |
| && (IS_ID (type) || IS_CLASS (type) || IS_SUPER (type)) |
| ? type |
| : NULL_TREE); |
| } |
| |
| /* Check whether TYPE is either 'id', 'Class', or a pointer to an ObjC |
| class instance. This is needed by other parts of the compiler to |
| handle ObjC types gracefully. */ |
| |
| tree |
| objc_is_object_ptr (tree type) |
| { |
| tree ret; |
| |
| type = TYPE_MAIN_VARIANT (type); |
| if (!POINTER_TYPE_P (type)) |
| return 0; |
| |
| ret = objc_is_id (type); |
| if (!ret) |
| ret = objc_is_class_name (TREE_TYPE (type)); |
| |
| return ret; |
| } |
| |
| static int |
| objc_is_gcable_type (tree type, int or_strong_p) |
| { |
| tree name; |
| |
| if (!TYPE_P (type)) |
| return 0; |
| if (objc_is_id (TYPE_MAIN_VARIANT (type))) |
| return 1; |
| if (or_strong_p && lookup_attribute ("objc_gc", TYPE_ATTRIBUTES (type))) |
| return 1; |
| if (TREE_CODE (type) != POINTER_TYPE && TREE_CODE (type) != INDIRECT_REF) |
| return 0; |
| type = TREE_TYPE (type); |
| if (TREE_CODE (type) != RECORD_TYPE) |
| return 0; |
| name = TYPE_NAME (type); |
| return (objc_is_class_name (name) != NULL_TREE); |
| } |
| |
| static tree |
| objc_substitute_decl (tree expr, tree oldexpr, tree newexpr) |
| { |
| if (expr == oldexpr) |
| return newexpr; |
| |
| switch (TREE_CODE (expr)) |
| { |
| case COMPONENT_REF: |
| return objc_build_component_ref |
| (objc_substitute_decl (TREE_OPERAND (expr, 0), |
| oldexpr, |
| newexpr), |
| DECL_NAME (TREE_OPERAND (expr, 1))); |
| case ARRAY_REF: |
| return build_array_ref (input_location, |
| objc_substitute_decl (TREE_OPERAND (expr, 0), |
| oldexpr, |
| newexpr), |
| TREE_OPERAND (expr, 1)); |
| case INDIRECT_REF: |
| return build_indirect_ref (input_location, |
| objc_substitute_decl (TREE_OPERAND (expr, 0), |
| oldexpr, |
| newexpr), RO_ARROW); |
| default: |
| return expr; |
| } |
| } |
| |
| static tree |
| objc_build_ivar_assignment (tree outervar, tree lhs, tree rhs) |
| { |
| tree func_params; |
| /* The LHS parameter contains the expression 'outervar->memberspec'; |
| we need to transform it into '&((typeof(outervar) *) 0)->memberspec', |
| where memberspec may be arbitrarily complex (e.g., 'g->f.d[2].g[3]'). |
| */ |
| tree offs |
| = objc_substitute_decl |
| (lhs, outervar, convert (TREE_TYPE (outervar), integer_zero_node)); |
| tree func |
| = (flag_objc_direct_dispatch |
| ? objc_assign_ivar_fast_decl |
| : objc_assign_ivar_decl); |
| |
| offs = convert (integer_type_node, build_unary_op (input_location, |
| ADDR_EXPR, offs, 0)); |
| offs = fold (offs); |
| func_params = tree_cons (NULL_TREE, |
| convert (objc_object_type, rhs), |
| tree_cons (NULL_TREE, convert (objc_object_type, outervar), |
| tree_cons (NULL_TREE, offs, |
| NULL_TREE))); |
| |
| return build_function_call (input_location, func, func_params); |
| } |
| |
| static tree |
| objc_build_global_assignment (tree lhs, tree rhs) |
| { |
| tree func_params = tree_cons (NULL_TREE, |
| convert (objc_object_type, rhs), |
| tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type), |
| build_unary_op (input_location, ADDR_EXPR, lhs, 0)), |
| NULL_TREE)); |
| |
| return build_function_call (input_location, |
| objc_assign_global_decl, func_params); |
| } |
| |
| static tree |
| objc_build_strong_cast_assignment (tree lhs, tree rhs) |
| { |
| tree func_params = tree_cons (NULL_TREE, |
| convert (objc_object_type, rhs), |
| tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type), |
| build_unary_op (input_location, ADDR_EXPR, lhs, 0)), |
| NULL_TREE)); |
| |
| return build_function_call (input_location, |
| objc_assign_strong_cast_decl, func_params); |
| } |
| |
| static int |
| objc_is_gcable_p (tree expr) |
| { |
| return (TREE_CODE (expr) == COMPONENT_REF |
| ? objc_is_gcable_p (TREE_OPERAND (expr, 1)) |
| : TREE_CODE (expr) == ARRAY_REF |
| ? (objc_is_gcable_p (TREE_TYPE (expr)) |
| || objc_is_gcable_p (TREE_OPERAND (expr, 0))) |
| : TREE_CODE (expr) == ARRAY_TYPE |
| ? objc_is_gcable_p (TREE_TYPE (expr)) |
| : TYPE_P (expr) |
| ? objc_is_gcable_type (expr, 1) |
| : (objc_is_gcable_p (TREE_TYPE (expr)) |
| || (DECL_P (expr) |
| && lookup_attribute ("objc_gc", DECL_ATTRIBUTES (expr))))); |
| } |
| |
| static int |
| objc_is_ivar_reference_p (tree expr) |
| { |
| return (TREE_CODE (expr) == ARRAY_REF |
| ? objc_is_ivar_reference_p (TREE_OPERAND (expr, 0)) |
| : TREE_CODE (expr) == COMPONENT_REF |
| ? TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL |
| : 0); |
| } |
| |
| static int |
| objc_is_global_reference_p (tree expr) |
| { |
| return (TREE_CODE (expr) == INDIRECT_REF || TREE_CODE (expr) == PLUS_EXPR |
| ? objc_is_global_reference_p (TREE_OPERAND (expr, 0)) |
| : DECL_P (expr) |
| ? (DECL_FILE_SCOPE_P (expr) || TREE_STATIC (expr)) |
| : 0); |
| } |
| |
| tree |
| objc_generate_write_barrier (tree lhs, enum tree_code modifycode, tree rhs) |
| { |
| tree result = NULL_TREE, outer; |
| int strong_cast_p = 0, outer_gc_p = 0, indirect_p = 0; |
| |
| /* This function is currently only used with the next runtime with |
| garbage collection enabled (-fobjc-gc). */ |
| gcc_assert (flag_next_runtime); |
| |
| /* See if we have any lhs casts, and strip them out. NB: The lvalue casts |
| will have been transformed to the form '*(type *)&expr'. */ |
| if (TREE_CODE (lhs) == INDIRECT_REF) |
| { |
| outer = TREE_OPERAND (lhs, 0); |
| |
| while (!strong_cast_p |
| && (CONVERT_EXPR_P (outer) |
| || TREE_CODE (outer) == NON_LVALUE_EXPR)) |
| { |
| tree lhstype = TREE_TYPE (outer); |
| |
| /* Descend down the cast chain, and record the first objc_gc |
| attribute found. */ |
| if (POINTER_TYPE_P (lhstype)) |
| { |
| tree attr |
| = lookup_attribute ("objc_gc", |
| TYPE_ATTRIBUTES (TREE_TYPE (lhstype))); |
| |
| if (attr) |
| strong_cast_p = 1; |
| } |
| |
| outer = TREE_OPERAND (outer, 0); |
| } |
| } |
| |
| /* If we have a __strong cast, it trumps all else. */ |
| if (strong_cast_p) |
| { |
| if (modifycode != NOP_EXPR) |
| goto invalid_pointer_arithmetic; |
| |
| if (warn_assign_intercept) |
| warning (0, "strong-cast assignment has been intercepted"); |
| |
| result = objc_build_strong_cast_assignment (lhs, rhs); |
| |
| goto exit_point; |
| } |
| |
| /* the lhs must be of a suitable type, regardless of its underlying |
| structure. */ |
| if (!objc_is_gcable_p (lhs)) |
| goto exit_point; |
| |
| outer = lhs; |
| |
| while (outer |
| && (TREE_CODE (outer) == COMPONENT_REF |
| || TREE_CODE (outer) == ARRAY_REF)) |
| outer = TREE_OPERAND (outer, 0); |
| |
| if (TREE_CODE (outer) == INDIRECT_REF) |
| { |
| outer = TREE_OPERAND (outer, 0); |
| indirect_p = 1; |
| } |
| |
| outer_gc_p = objc_is_gcable_p (outer); |
| |
| /* Handle ivar assignments. */ |
| if (objc_is_ivar_reference_p (lhs)) |
| { |
| /* if the struct to the left of the ivar is not an Objective-C object (__strong |
| doesn't cut it here), the best we can do here is suggest a cast. */ |
| if (!objc_is_gcable_type (TREE_TYPE (outer), 0)) |
| { |
| /* We may still be able to use the global write barrier... */ |
| if (!indirect_p && objc_is_global_reference_p (outer)) |
| goto global_reference; |
| |
| suggest_cast: |
| if (modifycode == NOP_EXPR) |
| { |
| if (warn_assign_intercept) |
| warning (0, "strong-cast may possibly be needed"); |
| } |
| |
| goto exit_point; |
| } |
| |
| if (modifycode != NOP_EXPR) |
| goto invalid_pointer_arithmetic; |
| |
| if (warn_assign_intercept) |
| warning (0, "instance variable assignment has been intercepted"); |
| |
| result = objc_build_ivar_assignment (outer, lhs, rhs); |
| |
| goto exit_point; |
| } |
| |
| /* Likewise, intercept assignment to global/static variables if their type is |
| GC-marked. */ |
| if (objc_is_global_reference_p (outer)) |
| { |
| if (indirect_p) |
| goto suggest_cast; |
| |
| global_reference: |
| if (modifycode != NOP_EXPR) |
| { |
| invalid_pointer_arithmetic: |
| if (outer_gc_p) |
| warning (0, "pointer arithmetic for garbage-collected objects not allowed"); |
| |
| goto exit_point; |
| } |
| |
| if (warn_assign_intercept) |
| warning (0, "global/static variable assignment has been intercepted"); |
| |
| result = objc_build_global_assignment (lhs, rhs); |
| } |
| |
| /* In all other cases, fall back to the normal mechanism. */ |
| exit_point: |
| return result; |
| } |
| |
| /* Implementation of the table mapping a class name (as an identifier) |
| to a class node. The two public functions for it are |
| lookup_interface() and add_interface(). add_interface() is only |
| used in this file, so we can make it static. */ |
| |
| static GTY(()) objc_map_t interface_map; |
| |
| static void |
| interface_hash_init (void) |
| { |
| interface_map = objc_map_alloc_ggc (200); |
| } |
| |
| static tree |
| add_interface (tree class_name, tree name) |
| { |
| /* Put interfaces on list in reverse order. */ |
| TREE_CHAIN (class_name) = interface_chain; |
| interface_chain = class_name; |
| |
| /* Add it to the map. */ |
| objc_map_put (interface_map, name, class_name); |
| |
| return interface_chain; |
| } |
| |
| tree |
| lookup_interface (tree ident) |
| { |
| #ifdef OBJCPLUS |
| if (ident && TREE_CODE (ident) == TYPE_DECL) |
| ident = DECL_NAME (ident); |
| #endif |
| |
| if (ident == NULL_TREE || TREE_CODE (ident) != IDENTIFIER_NODE) |
| return NULL_TREE; |
| |
| { |
| tree interface = objc_map_get (interface_map, ident); |
| |
| if (interface == OBJC_MAP_NOT_FOUND) |
| return NULL_TREE; |
| else |
| return interface; |
| } |
| } |
| |
| |
| |
| /* Implement @defs (<classname>) within struct bodies. */ |
| |
| tree |
| objc_get_class_ivars (tree class_name) |
| { |
| tree interface = lookup_interface (class_name); |
| |
| if (interface) |
| return get_class_ivars (interface, true); |
| |
| error ("cannot find interface declaration for %qE", |
| class_name); |
| |
| return error_mark_node; |
| } |
| |
| |
| /* Functions used by the hashtable for field duplicates in |
| objc_detect_field_duplicates(). Ideally, we'd use a standard |
| key-value dictionary hashtable , and store as keys the field names, |
| and as values the actual declarations (used to print nice error |
| messages with the locations). But, the hashtable we are using only |
| allows us to store keys in the hashtable, without values (it looks |
| more like a set). So, we store the DECLs, but define equality as |
| DECLs having the same name, and hash as the hash of the name. */ |
| |
| struct decl_name_hash : nofree_ptr_hash <tree_node> |
| { |
| static inline hashval_t hash (const tree_node *); |
| static inline bool equal (const tree_node *, const tree_node *); |
| }; |
| |
| inline hashval_t |
| decl_name_hash::hash (const tree_node *q) |
| { |
| return (hashval_t) ((intptr_t)(DECL_NAME (q)) >> 3); |
| } |
| |
| inline bool |
| decl_name_hash::equal (const tree_node *a, const tree_node *b) |
| { |
| return DECL_NAME (a) == DECL_NAME (b); |
| } |
| |
| /* Called when checking the variables in a struct. If we are not |
| doing the ivars list inside an @interface context, then return |
| false. Else, perform the check for duplicate ivars, then return |
| true. The check for duplicates checks if an instance variable with |
| the same name exists in the class or in a superclass. If |
| 'check_superclasses_only' is set to true, then it is assumed that |
| checks for instance variables in the same class has already been |
| performed (this is the case for ObjC++) and only the instance |
| variables of superclasses are checked. */ |
| bool |
| objc_detect_field_duplicates (bool check_superclasses_only) |
| { |
| if (!objc_collecting_ivars || !objc_interface_context |
| || TREE_CODE (objc_interface_context) != CLASS_INTERFACE_TYPE) |
| return false; |
| |
| /* We have two ways of doing this check: |
| |
| "direct comparison": we iterate over the instance variables and |
| compare them directly. This works great for small numbers of |
| instance variables (such as 10 or 20), which are extremely common. |
| But it will potentially take forever for the pathological case with |
| a huge number (eg, 10k) of instance variables. |
| |
| "hashtable": we use a hashtable, which requires a single sweep |
| through the list of instances variables. This is much slower for a |
| small number of variables, and we only use it for large numbers. |
| |
| To decide which one to use, we need to get an idea of how many |
| instance variables we have to compare. */ |
| { |
| unsigned int number_of_ivars_to_check = 0; |
| { |
| tree ivar; |
| for (ivar = CLASS_RAW_IVARS (objc_interface_context); |
| ivar; ivar = DECL_CHAIN (ivar)) |
| { |
| /* Ignore anonymous ivars. */ |
| if (DECL_NAME (ivar)) |
| number_of_ivars_to_check++; |
| } |
| } |
| |
| /* Exit if there is nothing to do. */ |
| if (number_of_ivars_to_check == 0) |
| return true; |
| |
| /* In case that there are only 1 or 2 instance variables to check, |
| we always use direct comparison. If there are more, it is |
| worth iterating over the instance variables in the superclass |
| to count how many there are (note that this has the same cost |
| as checking 1 instance variable by direct comparison, which is |
| why we skip this check in the case of 1 or 2 ivars and just do |
| the direct comparison) and then decide if it worth using a |
| hashtable. */ |
| if (number_of_ivars_to_check > 2) |
| { |
| unsigned int number_of_superclass_ivars = 0; |
| { |
| tree interface; |
| for (interface = lookup_interface (CLASS_SUPER_NAME (objc_interface_context)); |
| interface; interface = lookup_interface (CLASS_SUPER_NAME (interface))) |
| { |
| tree ivar; |
| for (ivar = CLASS_RAW_IVARS (interface); |
| ivar; ivar = DECL_CHAIN (ivar)) |
| number_of_superclass_ivars++; |
| } |
| } |
| |
| /* We use a hashtable if we have over 10k comparisons. */ |
| if (number_of_ivars_to_check * (number_of_superclass_ivars |
| + (number_of_ivars_to_check / 2)) |
| > 10000) |
| { |
| /* First, build the hashtable by putting all the instance |
| variables of superclasses in it. */ |
| hash_table<decl_name_hash> htab (37); |
| tree interface; |
| for (interface = lookup_interface (CLASS_SUPER_NAME |
| (objc_interface_context)); |
| interface; interface = lookup_interface |
| (CLASS_SUPER_NAME (interface))) |
| { |
| tree ivar; |
| for (ivar = CLASS_RAW_IVARS (interface); ivar; |
| ivar = DECL_CHAIN (ivar)) |
| { |
| if (DECL_NAME (ivar) != NULL_TREE) |
| { |
| tree_node **slot = htab.find_slot (ivar, INSERT); |
| /* Do not check for duplicate instance |
| variables in superclasses. Errors have |
| already been generated. */ |
| *slot = ivar; |
| } |
| } |
| } |
| |
| /* Now, we go through all the instance variables in the |
| class, and check that they are not in the |
| hashtable. */ |
| if (check_superclasses_only) |
| { |
| tree ivar; |
| for (ivar = CLASS_RAW_IVARS (objc_interface_context); ivar; |
| ivar = DECL_CHAIN (ivar)) |
| { |
| if (DECL_NAME (ivar) != NULL_TREE) |
| { |
| tree duplicate_ivar = htab.find (ivar); |
| if (duplicate_ivar != HTAB_EMPTY_ENTRY) |
| { |
| error_at (DECL_SOURCE_LOCATION (ivar), |
| "duplicate instance variable %q+D", |
| ivar); |
| inform (DECL_SOURCE_LOCATION (duplicate_ivar), |
| "previous declaration of %q+D", |
| duplicate_ivar); |
| /* FIXME: Do we need the following ? */ |
| /* DECL_NAME (ivar) = NULL_TREE; */ |
| } |
| } |
| } |
| } |
| else |
| { |
| /* If we're checking for duplicates in the class as |
| well, we insert variables in the hashtable as we |
| check them, so if a duplicate follows, it will be |
| caught. */ |
| tree ivar; |
| for (ivar = CLASS_RAW_IVARS (objc_interface_context); ivar; |
| ivar = DECL_CHAIN (ivar)) |
| { |
| if (DECL_NAME (ivar) != NULL_TREE) |
| { |
| tree_node **slot = htab.find_slot (ivar, INSERT); |
| if (*slot) |
| { |
| tree duplicate_ivar = (tree)(*slot); |
| error_at (DECL_SOURCE_LOCATION (ivar), |
| "duplicate instance variable %q+D", |
| ivar); |
| inform (DECL_SOURCE_LOCATION (duplicate_ivar), |
| "previous declaration of %q+D", |
| duplicate_ivar); |
| /* FIXME: Do we need the following ? */ |
| /* DECL_NAME (ivar) = NULL_TREE; */ |
| } |
| *slot = ivar; |
| } |
| } |
| } |
| return true; |
| } |
| } |
| } |
| |
| /* This is the "direct comparison" approach, which is used in most |
| non-pathological cases. */ |
| { |
| /* Walk up to class hierarchy, starting with this class (this is |
| the external loop, because lookup_interface() is expensive, and |
| we want to do it few times). */ |
| tree interface = objc_interface_context; |
| |
| if (check_superclasses_only) |
| interface = lookup_interface (CLASS_SUPER_NAME (interface)); |
| |
| for ( ; interface; interface = lookup_interface |
| (CLASS_SUPER_NAME (interface))) |
| { |
| tree ivar_being_checked; |
| |
| for (ivar_being_checked = CLASS_RAW_IVARS (objc_interface_context); |
| ivar_being_checked; |
| ivar_being_checked = DECL_CHAIN (ivar_being_checked)) |
| { |
| tree decl; |
| |
| /* Ignore anonymous ivars. */ |
| if (DECL_NAME (ivar_being_checked) == NULL_TREE) |
| continue; |
| |
| /* Note how we stop when we find the ivar we are checking |
| (this can only happen in the main class, not |
| superclasses), to avoid comparing things twice |
| (otherwise, for each ivar, you'd compare A to B then B |
| to A, and get duplicated error messages). */ |
| for (decl = CLASS_RAW_IVARS (interface); |
| decl && decl != ivar_being_checked; |
| decl = DECL_CHAIN (decl)) |
| { |
| if (DECL_NAME (ivar_being_checked) == DECL_NAME (decl)) |
| { |
| error_at (DECL_SOURCE_LOCATION (ivar_being_checked), |
| "duplicate instance variable %q+D", |
| ivar_being_checked); |
| inform (DECL_SOURCE_LOCATION (decl), |
| "previous declaration of %q+D", |
| decl); |
| /* FIXME: Do we need the following ? */ |
| /* DECL_NAME (ivar_being_checked) = NULL_TREE; */ |
| } |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| /* Used by: build_private_template, continue_class, |
| and for @defs constructs. */ |
| |
| static tree |
| get_class_ivars (tree interface, bool inherited) |
| { |
| tree ivar_chain = copy_list (CLASS_RAW_IVARS (interface)); |
| |
| /* Both CLASS_RAW_IVARS and CLASS_IVARS contain a list of ivars declared |
| by the current class (i.e., they do not include super-class ivars). |
| However, the CLASS_IVARS list will be side-effected by a call to |
| finish_struct(), which will fill in field offsets. */ |
| if (!CLASS_IVARS (interface)) |
| CLASS_IVARS (interface) = ivar_chain; |
| |
| if (!inherited) |
| return ivar_chain; |
| |
| while (CLASS_SUPER_NAME (interface)) |
| { |
| /* Prepend super-class ivars. */ |
| interface = lookup_interface (CLASS_SUPER_NAME (interface)); |
| ivar_chain = chainon (copy_list (CLASS_RAW_IVARS (interface)), |
| ivar_chain); |
| } |
| |
| return ivar_chain; |
| } |
| |
| void |
| objc_maybe_warn_exceptions (location_t loc) |
| { |
| /* -fobjc-exceptions is required to enable Objective-C exceptions. |
| For example, on Darwin, ObjC exceptions require a sufficiently |
| recent version of the runtime, so the user must ask for them |
| explicitly. On other platforms, at the moment -fobjc-exceptions |
| triggers -fexceptions which again is required for exceptions to |
| work. */ |
| if (!flag_objc_exceptions) |
| { |
| /* Warn only once per compilation unit. */ |
| static bool warned = false; |
| |
| if (!warned) |
| { |
| error_at (loc, "%<-fobjc-exceptions%> is required to enable Objective-C exception syntax"); |
| warned = true; |
| } |
| } |
| } |
| |
| static struct objc_try_context *cur_try_context; |
| |
| /* Called just after parsing the @try and its associated BODY. We now |
| must prepare for the tricky bits -- handling the catches and finally. */ |
| |
| void |
| objc_begin_try_stmt (location_t try_locus, tree body) |
| { |
| struct objc_try_context *c = XCNEW (struct objc_try_context); |
| c->outer = cur_try_context; |
| c->try_body = body; |
| c->try_locus = try_locus; |
| c->end_try_locus = input_location; |
| cur_try_context = c; |
| |
| /* Collect the list of local variables. We'll mark them as volatile |
| at the end of compilation of this function to prevent them being |
| clobbered by setjmp/longjmp. */ |
| if (flag_objc_sjlj_exceptions) |
| objc_mark_locals_volatile (NULL); |
| } |
| |
| /* Called just after parsing "@catch (parm)". Open a binding level, |
| enter DECL into the binding level, and initialize it. Leave the |
| binding level open while the body of the compound statement is |
| parsed. If DECL is NULL_TREE, then we are compiling "@catch(...)" |
| which we compile as "@catch(id tmp_variable)". */ |
| |
| void |
| objc_begin_catch_clause (tree decl) |
| { |
| tree compound, type, t; |
| bool ellipsis = false; |
| |
| /* Begin a new scope that the entire catch clause will live in. */ |
| compound = c_begin_compound_stmt (true); |
| |
| /* Create the appropriate declaration for the argument. */ |
| if (decl == error_mark_node) |
| type = error_mark_node; |
| else |
| { |
| if (decl == NULL_TREE) |
| { |
| /* If @catch(...) was specified, create a temporary variable of |
| type 'id' and use it. */ |
| decl = objc_create_temporary_var (objc_object_type, "__objc_generic_catch_var"); |
| DECL_SOURCE_LOCATION (decl) = input_location; |
| /* ... but allow the runtime to differentiate between ellipsis and the |
| case of @catch (id xyz). */ |
| ellipsis = true; |
| } |
| else |
| { |
| /* The parser passed in a PARM_DECL, but what we really want is a VAR_DECL. */ |
| decl = build_decl (input_location, |
| VAR_DECL, DECL_NAME (decl), TREE_TYPE (decl)); |
| } |
| lang_hooks.decls.pushdecl (decl); |
| |
| /* Mark the declaration as used so you never any warnings whether |
| you use the exception argument or not. TODO: Implement a |
| -Wunused-exception-parameter flag, which would cause warnings |
| if exception parameter is not used. */ |
| TREE_USED (decl) = 1; |
| DECL_READ_P (decl) = 1; |
| |
| type = TREE_TYPE (decl); |
| } |
| |
| /* Verify that the type of the catch is valid. It must be a pointer |
| to an Objective-C class, or "id" (which is catch-all). */ |
| if (type == error_mark_node) |
| { |
| ;/* Just keep going. */ |
| } |
| else if (!objc_type_valid_for_messaging (type, false)) |
| { |
| error ("%<@catch%> parameter is not a known Objective-C class type"); |
| type = error_mark_node; |
| } |
| else if (TYPE_HAS_OBJC_INFO (TREE_TYPE (type)) |
| && TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (type))) |
| { |
| error ("%<@catch%> parameter cannot be protocol-qualified"); |
| type = error_mark_node; |
| } |
| else if (POINTER_TYPE_P (type) && objc_is_object_id (TREE_TYPE (type))) |
| /* @catch (id xyz) or @catch (...) but we note this for runtimes that |
| identify 'id'. */ |
| ; |
| else |
| { |
| /* If 'type' was built using typedefs, we need to get rid of |
| them and get a simple pointer to the class. */ |
| bool is_typedef = false; |
| tree x = TYPE_MAIN_VARIANT (type); |
| |
| /* Skip from the pointer to the pointee. */ |
| if (TREE_CODE (x) == POINTER_TYPE) |
| x = TREE_TYPE (x); |
| |
| /* Traverse typedef aliases */ |
| while (TREE_CODE (x) == RECORD_TYPE && OBJC_TYPE_NAME (x) |
| && TREE_CODE (OBJC_TYPE_NAME (x)) == TYPE_DECL |
| && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (x))) |
| { |
| is_typedef = true; |
| x = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (x)); |
| } |
| |
| /* If it was a typedef, build a pointer to the final, original |
| class. */ |
| if (is_typedef) |
| type = build_pointer_type (x); |
| |
| if (cur_try_context->catch_list) |
| { |
| /* Examine previous @catch clauses and see if we've already |
| caught the type in question. */ |
| tree_stmt_iterator i = tsi_start (cur_try_context->catch_list); |
| for (; !tsi_end_p (i); tsi_next (&i)) |
| { |
| tree stmt = tsi_stmt (i); |
| t = CATCH_TYPES (stmt); |
| if (t == error_mark_node) |
| continue; |
| if (!t || DERIVED_FROM_P (TREE_TYPE (t), TREE_TYPE (type))) |
| { |
| warning (0, "exception of type %<%T%> will be caught", |
| TREE_TYPE (type)); |
| warning_at (EXPR_LOCATION (stmt), 0, " by earlier handler for %<%T%>", |
| TREE_TYPE (t ? t : objc_object_type)); |
| break; |
| } |
| } |
| } |
| } |
| |
| t = (*runtime.begin_catch) (&cur_try_context, type, decl, compound, ellipsis); |
| add_stmt (t); |
| } |
| |
| /* Called just after parsing the closing brace of a @catch clause. Close |
| the open binding level, and record a CATCH_EXPR for it. */ |
| |
| void |
| objc_finish_catch_clause (void) |
| { |
| tree c = cur_try_context->current_catch; |
| cur_try_context->current_catch = NULL; |
| cur_try_context->end_catch_locus = input_location; |
| |
| CATCH_BODY (c) = c_end_compound_stmt (input_location, CATCH_BODY (c), 1); |
| |
| (*runtime.finish_catch) (&cur_try_context, c); |
| } |
| |
| /* Called after parsing a @finally clause and its associated BODY. |
| Record the body for later placement. */ |
| |
| void |
| objc_build_finally_clause (location_t finally_locus, tree body) |
| { |
| cur_try_context->finally_body = body; |
| cur_try_context->finally_locus = finally_locus; |
| cur_try_context->end_finally_locus = input_location; |
| } |
| |
| /* Called to finalize a @try construct. */ |
| |
| tree |
| objc_finish_try_stmt (void) |
| { |
| struct objc_try_context *c = cur_try_context; |
| tree stmt; |
| |
| if (c->catch_list == NULL && c->finally_body == NULL) |
| error ("%<@try%> without %<@catch%> or %<@finally%>"); |
| |
| stmt = (*runtime.finish_try_stmt) (&cur_try_context); |
| add_stmt (stmt); |
| |
| cur_try_context = c->outer; |
| free (c); |
| return stmt; |
| } |
| |
| tree |
| objc_build_throw_stmt (location_t loc, tree throw_expr) |
| { |
| bool rethrown = false; |
| |
| objc_maybe_warn_exceptions (loc); |
| |
| /* Don't waste time trying to build something if we're already dead. */ |
| if (throw_expr == error_mark_node) |
| return error_mark_node; |
| |
| if (throw_expr == NULL) |
| { |
| /* If we're not inside a @catch block, there is no "current |
| exception" to be rethrown. */ |
| if (cur_try_context == NULL |
| || cur_try_context->current_catch == NULL) |
| { |
| error_at (loc, |
| "%<@throw%> (rethrow) used outside of a %<@catch%> block"); |
| return error_mark_node; |
| } |
| |
| /* Otherwise the object is still sitting in the EXC_PTR_EXPR |
| value that we get from the runtime. */ |
| throw_expr = (*runtime.build_exc_ptr) (&cur_try_context); |
| rethrown = true; |
| } |
| else |
| { |
| if (!objc_type_valid_for_messaging (TREE_TYPE (throw_expr), true)) |
| { |
| error_at (loc, "%<@throw%> argument is not an object"); |
| return error_mark_node; |
| } |
| } |
| |
| return (*runtime.build_throw_stmt) (loc, throw_expr, rethrown); |
| } |
| |
| tree |
| objc_build_synchronized (location_t start_locus, tree object_expr, tree body) |
| { |
| /* object_expr should never be NULL; but in case it is, convert it to |
| error_mark_node. */ |
| if (object_expr == NULL) |
| object_expr = error_mark_node; |
| |
| /* Validate object_expr. If not valid, set it to error_mark_node. */ |
| if (object_expr != error_mark_node) |
| { |
| if (!objc_type_valid_for_messaging (TREE_TYPE (object_expr), true)) |
| { |
| error_at (start_locus, "%<@synchronized%> argument is not an object"); |
| object_expr = error_mark_node; |
| } |
| } |
| |
| if (object_expr == error_mark_node) |
| { |
| /* If we found an error, we simply ignore the '@synchronized'. |
| Compile the body so we can keep going with minimal |
| casualties. */ |
| return add_stmt (body); |
| } |
| else |
| { |
| tree call; |
| tree args; |
| |
| /* objc_sync_enter (object_expr); */ |
| object_expr = save_expr (object_expr); |
| args = tree_cons (NULL, object_expr, NULL); |
| call = build_function_call (input_location, |
| objc_sync_enter_decl, args); |
| SET_EXPR_LOCATION (call, start_locus); |
| add_stmt (call); |
| |
| /* Build "objc_sync_exit (object_expr);" but do not add it yet; |
| it goes inside the @finalize() clause. */ |
| args = tree_cons (NULL, object_expr, NULL); |
| call = build_function_call (input_location, |
| objc_sync_exit_decl, args); |
| SET_EXPR_LOCATION (call, input_location); |
| |
| /* @try { body; } */ |
| objc_begin_try_stmt (start_locus, body); |
| |
| /* @finally { objc_sync_exit (object_expr); } */ |
| objc_build_finally_clause (input_location, call); |
| |
| /* End of try statement. */ |
| return objc_finish_try_stmt (); |
| } |
| } |
| |
| /* Construct a C struct corresponding to ObjC class CLASS, with the same |
| name as the class: |
| |
| struct <classname> { |
| struct _objc_class *isa; |
| ... |
| }; */ |
| |
| static void |
| build_private_template (tree klass) |
| { |
| if (!CLASS_STATIC_TEMPLATE (klass)) |
| { |
| tree record = objc_build_struct (klass, |
| get_class_ivars (klass, false), |
| CLASS_SUPER_NAME (klass)); |
| |
| /* Set the TREE_USED bit for this struct, so that stab generator |
| can emit stabs for this struct type. */ |
| if (flag_debug_only_used_symbols && TYPE_STUB_DECL (record)) |
| TREE_USED (TYPE_STUB_DECL (record)) = 1; |
| |
| /* Copy the attributes from the class to the type. */ |
| if (TREE_DEPRECATED (klass)) |
| TREE_DEPRECATED (record) = 1; |
| if (TREE_UNAVAILABLE (klass)) |
| TREE_UNAVAILABLE (record) = 1; |
| } |
| } |
| |
| /* Generate either '- .cxx_construct' or '- .cxx_destruct' for the |
| current class. */ |
| #ifdef OBJCPLUS |
| static void |
| objc_generate_cxx_ctor_or_dtor (bool dtor) |
| { |
| tree fn, body, compound_stmt, ivar; |
| |
| /* - (id) .cxx_construct { ... return self; } */ |
| /* - (void) .cxx_construct { ... } */ |
| |
| objc_start_method_definition |
| (false /* is_class_method */, |
| objc_build_method_signature (false /* is_class_method */, |
| build_tree_list (NULL_TREE, |
| dtor |
| ? void_type_node |
| : objc_object_type), |
| get_identifier (dtor |
| ? TAG_CXX_DESTRUCT |
| : TAG_CXX_CONSTRUCT), |
| make_node (TREE_LIST), |
| false), NULL, NULL_TREE); |
| body = begin_function_body (); |
| compound_stmt = begin_compound_stmt (0); |
| |
| ivar = CLASS_IVARS (implementation_template); |
| /* Destroy ivars in reverse order. */ |
| if (dtor) |
| ivar = nreverse (copy_list (ivar)); |
| |
| for (; ivar; ivar = TREE_CHAIN (ivar)) |
| { |
| if (TREE_CODE (ivar) == FIELD_DECL) |
| { |
| tree type = TREE_TYPE (ivar); |
| |
| /* Call the ivar's default constructor or destructor. Do not |
| call the destructor unless a corresponding constructor call |
| has also been made (or is not needed). */ |
| if (MAYBE_CLASS_TYPE_P (type) |
| && (dtor |
| ? (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) |
| && (!TYPE_NEEDS_CONSTRUCTING (type) |
| || TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) |
| : (TYPE_NEEDS_CONSTRUCTING (type) |
| && TYPE_HAS_DEFAULT_CONSTRUCTOR (type)))) |
| finish_expr_stmt |
| (build_special_member_call |
| (build_ivar_reference (DECL_NAME (ivar)), |
| dtor ? complete_dtor_identifier : complete_ctor_identifier, |
| NULL, type, LOOKUP_NORMAL, tf_warning_or_error)); |
| } |
| } |
| |
| /* The constructor returns 'self'. */ |
| if (!dtor) |
| finish_return_stmt (self_decl); |
| |
| finish_compound_stmt (compound_stmt); |
| finish_function_body (body); |
| fn = current_function_decl; |
| finish_function (); |
| objc_finish_method_definition (fn); |
| } |
| |
| /* The following routine will examine the current @interface for any |
| non-POD C++ ivars requiring non-trivial construction and/or |
| destruction, and then synthesize special '- .cxx_construct' and/or |
| '- .cxx_destruct' methods which will run the appropriate |
| construction or destruction code. Note that ivars inherited from |
| super-classes are _not_ considered. */ |
| static void |
| objc_generate_cxx_cdtors (void) |
| { |
| bool need_ctor = false, need_dtor = false; |
| tree ivar; |
| |
| /* Error case, due to possibly an extra @end. */ |
| if (!objc_implementation_context) |
| return; |
| |
| /* We do not want to do this for categories, since they do not have |
| their own ivars. */ |
| |
| if (TREE_CODE (objc_implementation_context) != CLASS_IMPLEMENTATION_TYPE) |
| return; |
| |
| /* First, determine if we even need a constructor and/or destructor. */ |
| |
| for (ivar = CLASS_IVARS (implementation_template); ivar; |
| ivar = TREE_CHAIN (ivar)) |
| { |
| if (TREE_CODE (ivar) == FIELD_DECL) |
| { |
| tree type = TREE_TYPE (ivar); |
| |
| if (MAYBE_CLASS_TYPE_P (type)) |
| { |
| if (TYPE_NEEDS_CONSTRUCTING (type) |
| && TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) |
| /* NB: If a default constructor is not available, we will not |
| be able to initialize this ivar; the add_instance_variable() |
| routine will already have warned about this. */ |
| need_ctor = true; |
| |
| if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) |
| && (!TYPE_NEEDS_CONSTRUCTING (type) |
| || TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) |
| /* NB: If a default constructor is not available, we will not |
| call the destructor either, for symmetry. */ |
| need_dtor = true; |
| } |
| } |
| } |
| |
| /* Generate '- .cxx_construct' if needed. */ |
| |
| if (need_ctor) |
| objc_generate_cxx_ctor_or_dtor (false); |
| |
| /* Generate '- .cxx_destruct' if needed. */ |
| |
| if (need_dtor) |
| objc_generate_cxx_ctor_or_dtor (true); |
| |
| /* The 'imp_list' variable points at an imp_entry record for the current |
| @implementation. Record the existence of '- .cxx_construct' and/or |
| '- .cxx_destruct' methods therein; it will be included in the |
| metadata for the class if the runtime needs it. */ |
| imp_list->has_cxx_cdtors = (need_ctor || need_dtor); |
| } |
| #endif |
| |
| static void |
| error_with_ivar (const char *message, tree decl) |
| { |
| error_at (DECL_SOURCE_LOCATION (decl), "%s %qs", |
| message, identifier_to_locale (gen_declaration (decl))); |
| |
| } |
| |
| static void |
| check_ivars (tree inter, tree imp) |
| { |
| tree intdecls = CLASS_RAW_IVARS (inter); |
| tree impdecls = CLASS_RAW_IVARS (imp); |
| |
| while (1) |
| { |
| tree t1, t2; |
| |
| #ifdef OBJCPLUS |
| if (intdecls && TREE_CODE (intdecls) == TYPE_DECL) |
| intdecls = TREE_CHAIN (intdecls); |
| #endif |
| if (intdecls == 0 && impdecls == 0) |
| break; |
| if (intdecls == 0 || impdecls == 0) |
| { |
| error ("inconsistent instance variable specification"); |
| break; |
| } |
| |
| t1 = TREE_TYPE (intdecls); t2 = TREE_TYPE (impdecls); |
| |
| if (!comptypes (t1, t2) |
| #ifdef OBJCPLUS |
| || !tree_int_cst_equal (DECL_BIT_FIELD_REPRESENTATIVE (intdecls), |
| DECL_BIT_FIELD_REPRESENTATIVE (impdecls)) |
| #else |
| || !tree_int_cst_equal (DECL_INITIAL (intdecls), |
| DECL_INITIAL (impdecls)) |
| #endif |
| ) |
| { |
| if (DECL_NAME (intdecls) == DECL_NAME (impdecls)) |
| { |
| error_with_ivar ("conflicting instance variable type", |
| impdecls); |
| error_with_ivar ("previous declaration of", |
| intdecls); |
| } |
| else /* both the type and the name don't match */ |
| { |
| error ("inconsistent instance variable specification"); |
| break; |
| } |
| } |
| |
| else if (DECL_NAME (intdecls) != DECL_NAME (impdecls)) |
| { |
| error_with_ivar ("conflicting instance variable name", |
| impdecls); |
| error_with_ivar ("previous declaration of", |
| intdecls); |
| } |
| |
| intdecls = DECL_CHAIN (intdecls); |
| impdecls = DECL_CHAIN (impdecls); |
| } |
| } |
| |
| |
| static void |
| mark_referenced_methods (void) |
| { |
| struct imp_entry *impent; |
| tree chain; |
| |
| for (impent = imp_list; impent; impent = impent->next) |
| { |
| chain = CLASS_CLS_METHODS (impent->imp_context); |
| while (chain) |
| { |
| cgraph_node::get_create (METHOD_DEFINITION (chain))->mark_force_output (); |
| chain = DECL_CHAIN (chain); |
| } |
| |
| chain = CLASS_NST_METHODS (impent->imp_context); |
| while (chain) |
| { |
| cgraph_node::get_create (METHOD_DEFINITION (chain))->mark_force_output (); |
| chain = DECL_CHAIN (chain); |
| } |
| } |
| } |
| |
| /* If type is empty or only type qualifiers are present, add default |
| type of id (otherwise grokdeclarator will default to int). */ |
| static inline tree |
| adjust_type_for_id_default (tree type) |
| { |
| if (!type) |
| type = make_node (TREE_LIST); |
| |
| if (!TREE_VALUE (type)) |
| TREE_VALUE (type) = objc_object_type; |
| else if (TREE_CODE (TREE_VALUE (type)) == RECORD_TYPE |
| && TYPED_OBJECT (TREE_VALUE (type))) |
| error ("cannot use an object as parameter to a method"); |
| |
| return type; |
| } |
| |
| /* Return a KEYWORD_DECL built using the specified key_name, arg_type, |
| arg_name and attributes. (TODO: Rename KEYWORD_DECL to |
| OBJC_METHOD_PARM_DECL ?) |
| |
| A KEYWORD_DECL is a tree representing the declaration of a |
| parameter of an Objective-C method. It is produced when parsing a |
| fragment of Objective-C method declaration of the form |
| |
| keyworddecl: |
| selector ':' '(' typename ')' identifier |
| |
| For example, take the Objective-C method |
| |
| -(NSString *)pathForResource:(NSString *)resource ofType:(NSString *)type; |
| |
| the two fragments "pathForResource:(NSString *)resource" and |
| "ofType:(NSString *)type" will generate a KEYWORD_DECL each. The |
| KEYWORD_DECL stores the 'key_name' (eg, identifier for |
| "pathForResource"), the 'arg_type' (eg, tree representing a |
| NSString *), the 'arg_name' (eg identifier for "resource") and |
| potentially some attributes (for example, a tree representing |
| __attribute__ ((unused)) if such an attribute was attached to a |
| certain parameter). You can access this information using the |
| TREE_TYPE (for arg_type), KEYWORD_ARG_NAME (for arg_name), |
| KEYWORD_KEY_NAME (for key_name), DECL_ATTRIBUTES (for attributes). |
| |
| 'key_name' is an identifier node (and is optional as you can omit |
| it in Objective-C methods). |
| 'arg_type' is a tree list (and is optional too if no parameter type |
| was specified). |
| 'arg_name' is an identifier node and is required. |
| 'attributes' is an optional tree containing parameter attributes. */ |
| tree |
| objc_build_keyword_decl (tree key_name, tree arg_type, |
| tree arg_name, tree attributes) |
| { |
| tree keyword_decl; |
| |
| if (flag_objc1_only && attributes) |
| error_at (input_location, "method argument attributes are not available in Objective-C 1.0"); |
| |
| /* If no type is specified, default to "id". */ |
| arg_type = adjust_type_for_id_default (arg_type); |
| |
| keyword_decl = make_node (KEYWORD_DECL); |
| |
| TREE_TYPE (keyword_decl) = arg_type; |
| KEYWORD_ARG_NAME (keyword_decl) = arg_name; |
| KEYWORD_KEY_NAME (keyword_decl) = key_name; |
| DECL_ATTRIBUTES (keyword_decl) = attributes; |
| |
| return keyword_decl; |
| } |
| |
| /* Given a chain of keyword_decl's, synthesize the full keyword selector. */ |
| static tree |
| build_keyword_selector (tree selector) |
| { |
| int len = 0; |
| tree key_chain, key_name; |
| char *buf; |
| |
| /* Scan the selector to see how much space we'll need. */ |
| for (key_chain = selector; key_chain; key_chain = TREE_CHAIN (key_chain)) |
| { |
| switch (TREE_CODE (selector)) |
| { |
| case KEYWORD_DECL: |
| key_name = KEYWORD_KEY_NAME (key_chain); |
| break; |
| case TREE_LIST: |
| key_name = TREE_PURPOSE (key_chain); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| if (key_name) |
| len += IDENTIFIER_LENGTH (key_name) + 1; |
| else |
| /* Just a ':' arg. */ |
| len++; |
| } |
| |
| buf = (char *) alloca (len + 1); |
| /* Start the buffer out as an empty string. */ |
| buf[0] = '\0'; |
| |
| for (key_chain = selector; key_chain; key_chain = TREE_CHAIN (key_chain)) |
| { |
| switch (TREE_CODE (selector)) |
| { |
| case KEYWORD_DECL: |
| key_name = KEYWORD_KEY_NAME (key_chain); |
| break; |
| case TREE_LIST: |
| key_name = TREE_PURPOSE (key_chain); |
| /* The keyword decl chain will later be used as a function |
| argument chain. Unhook the selector itself so as to not |
| confuse other parts of the compiler. */ |
| TREE_PURPOSE (key_chain) = NULL_TREE; |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| if (key_name) |
| strcat (buf, IDENTIFIER_POINTER (key_name)); |
| strcat (buf, ":"); |
| } |
| |
| return get_identifier_with_length (buf, len); |
| } |
| |
| /* Used for declarations and definitions. */ |
| |
| static tree |
| build_method_decl (enum tree_code code, tree ret_type, tree selector, |
| tree add_args, bool ellipsis) |
| { |
| tree method_decl; |
| |
| /* If no type is specified, default to "id". */ |
| ret_type = adjust_type_for_id_default (ret_type); |
| |
| /* Note how a method_decl has a TREE_TYPE which is not the function |
| type of the function implementing the method, but only the return |
| type of the method. We may want to change this, and store the |
| entire function type in there (eg, it may be used to simplify |
| dealing with attributes below). */ |
| method_decl = make_node (code); |
| TREE_TYPE (method_decl) = ret_type; |
| |
| /* If we have a keyword selector, create an identifier_node that |
| represents the full selector name (`:' included)... */ |
| if (TREE_CODE (selector) == KEYWORD_DECL) |
| { |
| METHOD_SEL_NAME (method_decl) = build_keyword_selector (selector); |
| METHOD_SEL_ARGS (method_decl) = selector; |
| METHOD_ADD_ARGS (method_decl) = add_args; |
| METHOD_ADD_ARGS_ELLIPSIS_P (method_decl) = ellipsis; |
| } |
| else |
| { |
| METHOD_SEL_NAME (method_decl) = selector; |
| METHOD_SEL_ARGS (method_decl) = NULL_TREE; |
| METHOD_ADD_ARGS (method_decl) = NULL_TREE; |
| } |
| |
| return method_decl; |
| } |
| |
| /* This routine processes objective-c method attributes. */ |
| |
| static void |
| objc_decl_method_attributes (tree *node, tree attributes, int flags) |
| { |
| /* TODO: Replace the hackery below. An idea would be to store the |
| full function type in the method declaration (for example in |
| TREE_TYPE) and then expose ObjC method declarations to c-family |
| and they could deal with them by simply treating them as |
| functions. */ |
| |
| /* Because of the dangers in the hackery below, we filter out any |
| attribute that we do not know about. For the ones we know about, |
| we know that they work with the hackery. For the other ones, |
| there is no guarantee, so we have to filter them out. */ |
| tree filtered_attributes = NULL_TREE; |
| |
| if (attributes) |
| { |
| tree attribute; |
| for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) |
| { |
| tree name = TREE_PURPOSE (attribute); |
| |
| if (is_attribute_p ("deprecated", name) |
| || is_attribute_p ("unavailable", name) |
| || is_attribute_p ("sentinel", name) |
| || is_attribute_p ("noreturn", name)) |
| { |
| /* An attribute that we support; add it to the filtered |
| attributes. */ |
| filtered_attributes = chainon (filtered_attributes, |
| copy_node (attribute)); |
| } |
| else if (is_attribute_p ("format", name)) |
| { |
| /* "format" is special because before adding it to the |
| filtered attributes we need to adjust the specified |
| format by adding the hidden function parameters for |
| an Objective-C method (self, _cmd). */ |
| tree new_attribute = copy_node (attribute); |
| |
| /* Check the arguments specified with the attribute, and |
| modify them adding 2 for the two hidden arguments. |
| Note how this differs from C++; according to the |
| specs, C++ does not do it so you have to add the +1 |
| yourself. For Objective-C, instead, the compiler |
| adds the +2 for you. */ |
| |
| /* The attribute arguments have not been checked yet, so |
| we need to be careful as they could be missing or |
| invalid. If anything looks wrong, we skip the |
| process and the compiler will complain about it later |
| when it validates the attribute. */ |
| /* Check that we have at least three arguments. */ |
| if (TREE_VALUE (new_attribute) |
| && TREE_CHAIN (TREE_VALUE (new_attribute)) |
| && TREE_CHAIN (TREE_CHAIN (TREE_VALUE (new_attribute)))) |
| { |
| tree second_argument = TREE_CHAIN (TREE_VALUE (new_attribute)); |
| tree third_argument = TREE_CHAIN (second_argument); |
| tree number; |
| |
| /* This is the second argument, the "string-index", |
| which specifies the index of the format string |
| argument. Add 2. */ |
| number = TREE_VALUE (second_argument); |
| if (number |
| && TREE_CODE (number) == INTEGER_CST |
| && wi::to_wide (number) != 0) |
| TREE_VALUE (second_argument) |
| = wide_int_to_tree (TREE_TYPE (number), |
| wi::to_wide (number) + 2); |
| |
| /* This is the third argument, the "first-to-check", |
| which specifies the index of the first argument to |
| check. This could be 0, meaning it is not available, |
| in which case we don't need to add 2. Add 2 if not |
| 0. */ |
| number = TREE_VALUE (third_argument); |
| if (number |
| && TREE_CODE (number) == INTEGER_CST |
| && wi::to_wide (number) != 0) |
| TREE_VALUE (third_argument) |
| = wide_int_to_tree (TREE_TYPE (number), |
| wi::to_wide (number) + 2); |
| } |
| filtered_attributes = chainon (filtered_attributes, |
| new_attribute); |
| } |
| else if (is_attribute_p ("nonnull", name)) |
| { |
| /* We need to fixup all the argument indexes by adding 2 |
| for the two hidden arguments of an Objective-C method |
| invocation, similat to what we do above for the |
| "format" attribute. */ |
| /* FIXME: This works great in terms of implementing the |
| functionality, but the warnings that are produced by |
| nonnull do mention the argument index (while the |
| format ones don't). For example, you could get |
| "warning: null argument where non-null required |
| (argument 3)". Now in that message, "argument 3" |
| includes the 2 hidden arguments; it would be much |
| more friendly to call it "argument 1", as that would |
| be consistent with __attribute__ ((nonnnull (1))). |
| To do this, we'd need to have the C family code that |
| checks the arguments know about adding/removing 2 to |
| the argument index ... or alternatively we could |
| maybe store the "printable" argument index in |
| addition to the actual argument index ? Some |
| refactoring is needed to do this elegantly. */ |
| tree new_attribute = copy_node (attribute); |
| tree argument = TREE_VALUE (attribute); |
| while (argument != NULL_TREE) |
| { |
| /* Get the value of the argument and add 2. */ |
| tree number = TREE_VALUE (argument); |
| if (number && TREE_CODE (number) == INTEGER_CST |
| && wi::to_wide (number) != 0) |
| TREE_VALUE (argument) |
| = wide_int_to_tree (TREE_TYPE (number), |
| wi::to_wide (number) + 2); |
| argument = TREE_CHAIN (argument); |
| } |
| |
| filtered_attributes = chainon (filtered_attributes, |
| new_attribute); |
| } |
| else |
| warning (OPT_Wattributes, "%qE attribute directive ignored", name); |
| } |
| } |
| |
| if (filtered_attributes) |
| { |
| /* This hackery changes the TREE_TYPE of the ObjC method |
| declaration to be a function type, so that decl_attributes |
| will treat the ObjC method as if it was a function. Some |
| attributes (sentinel, format) will be applied to the function |
| type, changing it in place; so after calling decl_attributes, |
| we extract the function type attributes and store them in |
| METHOD_TYPE_ATTRIBUTES. Some other attributes (noreturn, |
| deprecated) are applied directly to the method declaration |
| (by setting TREE_DEPRECATED and TREE_THIS_VOLATILE) so there |
| is nothing to do. */ |
| tree saved_type = TREE_TYPE (*node); |
| TREE_TYPE (*node) |
| = build_function_type_for_method (TREE_VALUE (saved_type), *node, |
| METHOD_REF, 0); |
| decl_attributes (node, filtered_attributes, flags); |
| METHOD_TYPE_ATTRIBUTES (*node) = TYPE_ATTRIBUTES (TREE_TYPE (*node)); |
| TREE_TYPE (*node) = saved_type; |
| } |
| } |
| |
| bool |
| objc_method_decl (enum tree_code opcode) |
| { |
| return opcode == INSTANCE_METHOD_DECL || opcode == CLASS_METHOD_DECL; |
| } |
| |
| /* Return a function type for METHOD with RETURN_TYPE. CONTEXT is |
| either METHOD_DEF or METHOD_REF, indicating whether we are defining a |
| method or calling one. SUPER_FLAG indicates whether this is a send |
| to super; this makes a difference for the NeXT calling sequence in |
| which the lookup and the method call are done together. If METHOD is |
| NULL, user-defined arguments (i.e., beyond self and _cmd) shall be |
| represented as varargs. */ |
| |
| tree |
| build_function_type_for_method (tree return_type, tree method, |
| int context, bool super_flag) |
| { |
| vec<tree, va_gc> *argtypes = make_tree_vector (); |
| tree t, ftype; |
| bool is_varargs = false; |
| |
| (*runtime.get_arg_type_list_base) (&argtypes, method, context, super_flag); |
| |
| /* No actual method prototype given; remaining args passed as varargs. */ |
| if (method == NULL_TREE) |
| { |
| is_varargs = true; |
| goto build_ftype; |
| } |
| |
| for (t = METHOD_SEL_ARGS (method); t; t = DECL_CHAIN (t)) |
| { |
| tree arg_type = TREE_VALUE (TREE_TYPE (t)); |
| |
| /* Decay argument types for the underlying C function as |
| appropriate. */ |
| arg_type = objc_decay_parm_type (arg_type); |
| |
| vec_safe_push (argtypes, arg_type); |
| } |
| |
| if (METHOD_ADD_ARGS (method)) |
| { |
| for (t = TREE_CHAIN (METHOD_ADD_ARGS (method)); |
| t; t = TREE_CHAIN (t)) |
| { |
| tree arg_type = TREE_TYPE (TREE_VALUE (t)); |
| |
| arg_type = objc_decay_parm_type (arg_type); |
| |
| vec_safe_push (argtypes, arg_type); |
| } |
| |
| if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) |
| is_varargs = true; |
| } |
| |
| build_ftype: |
| if (is_varargs) |
| ftype = build_varargs_function_type_vec (return_type, argtypes); |
| else |
| ftype = build_function_type_vec (return_type, argtypes); |
| |
| release_tree_vector (argtypes); |
| return ftype; |
| } |
| |
| /* The 'method' argument is a tree; this tree could either be a single |
| method, which is returned, or could be a TREE_VEC containing a list |
| of methods. In that case, the first one is returned, and warnings |
| are issued as appropriate. */ |
| static tree |
| check_duplicates (tree method, int methods, int is_class) |
| { |
| tree first_method; |
| size_t i; |
| |
| if (method == NULL_TREE) |
| return NULL_TREE; |
| |
| if (TREE_CODE (method) != TREE_VEC) |
| return method; |
| |
| /* We have two or more methods with the same name but different |
| types. */ |
| first_method = TREE_VEC_ELT (method, 0); |
| |
| /* But just how different are those types? If |
| -Wno-strict-selector-match is specified, we shall not complain if |
| the differences are solely among types with identical size and |
| alignment. */ |
| if (!warn_strict_selector_match) |
| { |
| for (i = 0; i < (size_t) TREE_VEC_LENGTH (method); i++) |
| if (!comp_proto_with_proto (first_method, TREE_VEC_ELT (method, i), 0)) |
| goto issue_warning; |
| |
| return first_method; |
| } |
| |
| issue_warning: |
| if (methods) |
| { |
| bool type = TREE_CODE (first_method) == INSTANCE_METHOD_DECL; |
| |
| warning_at (input_location, 0, |
| "multiple methods named %<%c%E%> found", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (first_method)); |
| inform (DECL_SOURCE_LOCATION (first_method), "using %<%c%s%>", |
| (type ? '-' : '+'), |
| identifier_to_locale (gen_method_decl (first_method))); |
| } |
| else |
| { |
| bool type = TREE_CODE (first_method) == INSTANCE_METHOD_DECL; |
| |
| warning_at (input_location, 0, |
| "multiple selectors named %<%c%E%> found", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (first_method)); |
| inform (DECL_SOURCE_LOCATION (first_method), "found %<%c%s%>", |
| (type ? '-' : '+'), |
| identifier_to_locale (gen_method_decl (first_method))); |
| } |
| |
| for (i = 0; i < (size_t) TREE_VEC_LENGTH (method); i++) |
| { |
| bool type = TREE_CODE (TREE_VEC_ELT (method, i)) == INSTANCE_METHOD_DECL; |
| |
| inform (DECL_SOURCE_LOCATION (TREE_VEC_ELT (method, i)), "also found %<%c%s%>", |
| (type ? '-' : '+'), |
| identifier_to_locale (gen_method_decl (TREE_VEC_ELT (method, i)))); |
| } |
| |
| return first_method; |
| } |
| |
| /* If RECEIVER is a class reference, return the identifier node for |
| the referenced class. RECEIVER is created by objc_get_class_reference, |
| so we check the exact form created depending on which runtimes are |
| used. */ |
| |
| static tree |
| receiver_is_class_object (tree receiver, int self, int super) |
| { |
| tree exp, arg; |
| |
| /* The receiver is 'self' or 'super' in the context of a class method. */ |
| if (objc_method_context |
| && TREE_CODE (objc_method_context) == CLASS_METHOD_DECL |
| && (self || super)) |
| return (super |
| ? CLASS_SUPER_NAME (implementation_template) |
| : CLASS_NAME (implementation_template)); |
| |
| /* The runtime might encapsulate things its own way. */ |
| exp = (*runtime.receiver_is_class_object) (receiver); |
| if (exp) |
| return exp; |
| |
| /* The receiver is a function call that returns an id. Check if |
| it is a call to objc_getClass, if so, pick up the class name. |
| |
| This is required by the GNU runtime, which compiles |
| |
| [NSObject alloc] |
| |
| into |
| |
| [objc_get_class ("NSObject") alloc]; |
| |
| and then, to check that the receiver responds to the +alloc |
| method, needs to be able to determine that the objc_get_class() |
| call returns the NSObject class and not just a generic Class |
| pointer. |
| |
| But, traditionally this is enabled for all runtimes, not just the |
| GNU one, which means that the compiler is smarter than you'd |
| expect when dealing with objc_getClass(). For example, with the |
| Apple runtime, in the code |
| |
| [objc_getClass ("NSObject") alloc]; |
| |
| the compiler will recognize the objc_getClass() call as special |
| (due to the code below) and so will know that +alloc is called on |
| the 'NSObject' class, and can perform the corresponding checks. |
| |
| Programmers can disable this behavior by casting the results of |
| objc_getClass() to 'Class' (this may seem weird because |
| objc_getClass() is already declared to return 'Class', but the |
| compiler treats it as a special function). This may be useful if |
| the class is never declared, and the compiler would complain |
| about a missing @interface for it. Then, you can do |
| |
| [(Class)objc_getClass ("MyClassNeverDeclared") alloc]; |
| |
| to silence the warnings. */ |
| if (TREE_CODE (receiver) == CALL_EXPR |
| && (exp = CALL_EXPR_FN (receiver)) |
| && TREE_CODE (exp) == ADDR_EXPR |
| && (exp = TREE_OPERAND (exp, 0)) |
| && TREE_CODE (exp) == FUNCTION_DECL |
| /* For some reason, we sometimes wind up with multiple FUNCTION_DECL |
| prototypes for objc_get_class(). Thankfully, they seem to share the |
| same function type. */ |
| && TREE_TYPE (exp) == TREE_TYPE (objc_get_class_decl) |
| && !strcmp (IDENTIFIER_POINTER (DECL_NAME (exp)), runtime.tag_getclass) |
| /* We have a call to objc_get_class/objc_getClass! */ |
| && (arg = CALL_EXPR_ARG (receiver, 0))) |
| { |
| STRIP_NOPS (arg); |
| if (TREE_CODE (arg) == ADDR_EXPR |
| && (arg = TREE_OPERAND (arg, 0)) |
| && TREE_CODE (arg) == STRING_CST) |
| /* Finally, we have the class name. */ |
| return get_identifier (TREE_STRING_POINTER (arg)); |
| } |
| return 0; |
| } |
| |
| /* If we are currently building a message expr, this holds |
| the identifier of the selector of the message. This is |
| used when printing warnings about argument mismatches. */ |
| |
| static tree current_objc_message_selector = 0; |
| |
| tree |
| objc_message_selector (void) |
| { |
| return current_objc_message_selector; |
| } |
| |
| /* Construct an expression for sending a message. |
| MESS has the object to send to in TREE_PURPOSE |
| and the argument list (including selector) in TREE_VALUE. |
| |
| (*(<abstract_decl>(*)())_msg)(receiver, selTransTbl[n], ...); |
| (*(<abstract_decl>(*)())_msgSuper)(receiver, selTransTbl[n], ...); */ |
| |
| tree |
| objc_build_message_expr (tree receiver, tree message_args) |
| { |
| tree sel_name; |
| #ifdef OBJCPLUS |
| tree args = TREE_PURPOSE (message_args); |
| #else |
| tree args = message_args; |
| #endif |
| tree method_params = NULL_TREE; |
| |
| if (TREE_CODE (receiver) == ERROR_MARK || TREE_CODE (args) == ERROR_MARK) |
| return error_mark_node; |
| |
| /* Obtain the full selector name. */ |
| switch (TREE_CODE (args)) |
| { |
| case IDENTIFIER_NODE: |
| /* A unary selector. */ |
| sel_name = args; |
| break; |
| case TREE_LIST: |
| sel_name = build_keyword_selector (args); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| /* Build the parameter list to give to the method. */ |
| if (TREE_CODE (args) == TREE_LIST) |
| #ifdef OBJCPLUS |
| method_params = chainon (args, TREE_VALUE (message_args)); |
| #else |
| { |
| tree chain = args, prev = NULL_TREE; |
| |
| /* We have a keyword selector--check for comma expressions. */ |
| while (chain) |
| { |
| tree element = TREE_VALUE (chain); |
| |
| /* We have a comma expression, must collapse... */ |
| if (TREE_CODE (element) == TREE_LIST) |
| { |
| if (prev) |
| TREE_CHAIN (prev) = element; |
| else |
| args = element; |
| } |
| prev = chain; |
| chain = TREE_CHAIN (chain); |
| } |
| method_params = args; |
| } |
| #endif |
| |
| #ifdef OBJCPLUS |
| if (processing_template_decl) |
| /* Must wait until template instantiation time. */ |
| return build_min_nt_loc (UNKNOWN_LOCATION, MESSAGE_SEND_EXPR, receiver, |
| sel_name, method_params); |
| #endif |
| |
| return objc_finish_message_expr (receiver, sel_name, method_params, NULL); |
| } |
| |
| /* Look up method SEL_NAME that would be suitable for receiver |
| of type 'id' (if IS_CLASS is zero) or 'Class' (if IS_CLASS is |
| nonzero), and report on any duplicates. */ |
| |
| static tree |
| lookup_method_in_hash_lists (tree sel_name, int is_class) |
| { |
| tree method_prototype = OBJC_MAP_NOT_FOUND; |
| |
| if (!is_class) |
| method_prototype = objc_map_get (instance_method_map, sel_name); |
| |
| if (method_prototype == OBJC_MAP_NOT_FOUND) |
| { |
| method_prototype = objc_map_get (class_method_map, sel_name); |
| is_class = 1; |
| |
| if (method_prototype == OBJC_MAP_NOT_FOUND) |
| return NULL_TREE; |
| } |
| |
| return check_duplicates (method_prototype, 1, is_class); |
| } |
| |
| /* The 'objc_finish_message_expr' routine is called from within |
| 'objc_build_message_expr' for non-template functions. In the case of |
| C++ template functions, it is called from 'build_expr_from_tree' |
| (in decl2.cc) after RECEIVER and METHOD_PARAMS have been expanded. |
| |
| If the method_prototype_avail argument is NULL, then we warn |
| if the method being used is deprecated. If it is not NULL, instead |
| of deprecating, we set *method_prototype_avail to the method |
| prototype that was used and is deprecated. This is useful for |
| getter calls that are always generated when compiling dot-syntax |
| expressions, even if they may not be used. In that case, we don't |
| want the warning immediately; we produce it (if needed) at gimplify |
| stage when we are sure that the deprecated getter is being |
| used. */ |
| tree |
| objc_finish_message_expr (tree receiver, tree sel_name, tree method_params, |
| tree *method_prototype_avail) |
| { |
| tree method_prototype = NULL_TREE, rprotos = NULL_TREE, rtype; |
| tree retval, class_tree; |
| int self, super, have_cast; |
| |
| STRIP_ANY_LOCATION_WRAPPER (receiver); |
| |
| /* We have used the receiver, so mark it as read. */ |
| mark_exp_read (receiver); |
| |
| /* Extract the receiver of the message, as well as its type |
| (where the latter may take the form of a cast or be inferred |
| from the implementation context). */ |
| rtype = receiver; |
| while (TREE_CODE (rtype) == COMPOUND_EXPR |
| || TREE_CODE (rtype) == MODIFY_EXPR |
| || CONVERT_EXPR_P (rtype) |
| || TREE_CODE (rtype) == COMPONENT_REF) |
| rtype = TREE_OPERAND (rtype, 0); |
| |
| /* self is 1 if this is a message to self, 0 otherwise */ |
| self = (rtype == self_decl); |
| |
| /* super is 1 if this is a message to super, 0 otherwise. */ |
| super = (rtype == UOBJC_SUPER_decl); |
| |
| /* rtype is the type of the receiver. */ |
| rtype = TREE_TYPE (receiver); |
| |
| /* have_cast is 1 if the receiver is casted. */ |
| have_cast = (TREE_CODE (receiver) == NOP_EXPR |
| || (TREE_CODE (receiver) == COMPOUND_EXPR |
| && !IS_SUPER (rtype))); |
| |
| /* If we are calling [super dealloc], reset our warning flag. */ |
| if (super && !strcmp ("dealloc", IDENTIFIER_POINTER (sel_name))) |
| should_call_super_dealloc = 0; |
| |
| /* If the receiver is a class object, retrieve the corresponding |
| @interface, if one exists. class_tree is the class name |
| identifier, or NULL_TREE if this is not a class method or the |
| class name could not be determined (as in the case "Class c; [c |
| method];"). */ |
| class_tree = receiver_is_class_object (receiver, self, super); |
| |
| /* Now determine the receiver type (if an explicit cast has not been |
| provided). */ |
| if (!have_cast) |
| { |
| if (class_tree) |
| { |
| /* We are here when we have no cast, and we have a class |
| name. So, this is a plain method to a class object, as |
| in [NSObject alloc]. Find the interface corresponding to |
| the class name. */ |
| rtype = lookup_interface (class_tree); |
| |
| if (rtype == NULL_TREE) |
| { |
| /* If 'rtype' is NULL_TREE at this point it means that |
| we have seen no @interface corresponding to that |
| class name, only a @class declaration (alternatively, |
| this was a call such as [objc_getClass("SomeClass") |
| alloc], where we've never seen the @interface of |
| SomeClass). So, we have a class name (class_tree) |
| but no actual details of the class methods. We won't |
| be able to check that the class responds to the |
| method, and we will have to guess the method |
| prototype. Emit a warning, then keep going (this |
| will use any method with a matching name, as if the |
| receiver was of type 'Class'). */ |
| warning (0, "%<@interface%> of class %qE not found", |
| class_tree); |
| } |
| } |
| /* Handle `self' and `super'. */ |
| else if (super) |
| { |
| if (!CLASS_SUPER_NAME (implementation_template)) |
| { |
| error ("no super class declared in @interface for %qE", |
| CLASS_NAME (implementation_template)); |
| return error_mark_node; |
| } |
| rtype = lookup_interface (CLASS_SUPER_NAME (implementation_template)); |
| } |
| else if (self) |
| rtype = lookup_interface (CLASS_NAME (implementation_template)); |
| } |
| |
| if (objc_is_id (rtype)) |
| { |
| /* The receiver is of type 'id' or 'Class' (with or without some |
| protocols attached to it). */ |
| |
| /* We set class_tree to the identifier for 'Class' if this is a |
| class method, and to NULL_TREE if not. */ |
| class_tree = (IS_CLASS (rtype) ? objc_class_name : NULL_TREE); |
| |
| /* 'rprotos' is the list of protocols that the receiver |
| supports. */ |
| rprotos = (TYPE_HAS_OBJC_INFO (TREE_TYPE (rtype)) |
| ? TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (rtype)) |
| : NULL_TREE); |
| |
| /* We have no information on the type, and we set it to |
| NULL_TREE. */ |
| rtype = NULL_TREE; |
| |
| /* If there are any protocols, check that the method we are |
| calling appears in the protocol list. If there are no |
| protocols, this is a message to 'id' or 'Class' and we accept |
| any method that exists. */ |
| if (rprotos) |
| { |
| /* If messaging 'id <Protos>' or 'Class <Proto>', first |
| search in protocols themselves for the method |
| prototype. */ |
| method_prototype |
| = lookup_method_in_protocol_list (rprotos, sel_name, |
| class_tree != NULL_TREE); |
| |
| /* If messaging 'Class <Proto>' but did not find a class |
| method prototype, search for an instance method instead, |
| and warn about having done so. */ |
| if (!method_prototype && !rtype && class_tree != NULL_TREE) |
| { |
| method_prototype |
| = lookup_method_in_protocol_list (rprotos, sel_name, 0); |
| |
| if (method_prototype) |
| warning (0, "found %<-%E%> instead of %<+%E%> in protocol(s)", |
| sel_name, sel_name); |
| } |
| } |
| } |
| else if (rtype) |
| { |
| /* We have a receiver type which is more specific than 'id' or |
| 'Class'. */ |
| tree orig_rtype = rtype; |
| |
| if (TREE_CODE (rtype) == POINTER_TYPE) |
| rtype = TREE_TYPE (rtype); |
| /* Traverse typedef aliases */ |
| while (TREE_CODE (rtype) == RECORD_TYPE && OBJC_TYPE_NAME (rtype) |
| && TREE_CODE (OBJC_TYPE_NAME (rtype)) == TYPE_DECL |
| && DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (rtype))) |
| rtype = DECL_ORIGINAL_TYPE (OBJC_TYPE_NAME (rtype)); |
| if (TYPED_OBJECT (rtype)) |
| { |
| rprotos = TYPE_OBJC_PROTOCOL_LIST (rtype); |
| rtype = TYPE_OBJC_INTERFACE (rtype); |
| } |
| if (!rtype || TREE_CODE (rtype) == IDENTIFIER_NODE) |
| { |
| /* If we could not find an @interface declaration, we must |
| have only seen a @class declaration; so, we cannot say |
| anything more intelligent about which methods the |
| receiver will understand. Note that this only happens |
| for instance methods; for class methods to a class where |
| we have only seen a @class declaration, |
| lookup_interface() above would have set rtype to |
| NULL_TREE. */ |
| if (rprotos) |
| { |
| /* We could not find an @interface declaration, yet, if |
| there are protocols attached to the type, we can |
| still look up the method in the protocols. Ie, we |
| are in the following case: |
| |
| @class MyClass; |
| MyClass<MyProtocol> *x; |
| [x method]; |
| |
| If 'MyProtocol' has the method 'method', we can check |
| and retrieve the method prototype. */ |
| method_prototype |
| = lookup_method_in_protocol_list (rprotos, sel_name, 0); |
| |
| /* At this point, if we have found the method_prototype, |
| we are quite happy. The details of the class are |
| irrelevant. If we haven't found it, a warning will |
| have been produced that the method could not be found |
| in the protocol, and we won't produce further |
| warnings (please note that this means that "@class |
| MyClass; MyClass <MyProtocol> *x;" is exactly |
| equivalent to "id <MyProtocol> x", which isn't too |
| satisfactory but it's not easy to see how to do |
| better). */ |
| } |
| else |
| { |
| if (rtype) |
| { |
| /* We could not find an @interface declaration, and |
| there are no protocols attached to the receiver, |
| so we can't complete the check that the receiver |
| responds to the method, and we can't retrieve the |
| method prototype. But, because the receiver has |
| a well-specified class, the programmer did want |
| this check to be performed. Emit a warning, then |
| keep going as if it was an 'id'. To remove the |
| warning, either include an @interface for the |
| class, or cast the receiver to 'id'. Note that |
| rtype is an IDENTIFIER_NODE at this point. */ |
| warning (0, "%<@interface%> of class %qE not found", rtype); |
| } |
| } |
| |
| rtype = NULL_TREE; |
| } |
| else if (TREE_CODE (rtype) == CLASS_INTERFACE_TYPE |
| || TREE_CODE (rtype) == CLASS_IMPLEMENTATION_TYPE) |
| { |
| /* We have a valid ObjC class name with an associated |
| @interface. Look up the method name in the published |
| @interface for the class (and its superclasses). */ |
| method_prototype |
| = lookup_method_static (rtype, sel_name, class_tree != NULL_TREE); |
| |
| /* If the method was not found in the @interface, it may still |
| exist locally as part of the @implementation. */ |
| if (!method_prototype && objc_implementation_context |
| && CLASS_NAME (objc_implementation_context) |
| == OBJC_TYPE_NAME (rtype)) |
| method_prototype |
| = lookup_method |
| ((class_tree |
| ? CLASS_CLS_METHODS (objc_implementation_context) |
| : CLASS_NST_METHODS (objc_implementation_context)), |
| sel_name); |
| |
| /* If we haven't found a candidate method by now, try looking for |
| it in the protocol list. */ |
| if (!method_prototype && rprotos) |
| method_prototype |
| = lookup_method_in_protocol_list (rprotos, sel_name, |
| class_tree != NULL_TREE); |
| } |
| else |
| { |
| /* We have a type, but it's not an Objective-C type (!). */ |
| warning (0, "invalid receiver type %qs", |
| identifier_to_locale (gen_type_name (orig_rtype))); |
| /* After issuing the "invalid receiver" warning, perform method |
| lookup as if we were messaging 'id'. */ |
| rtype = rprotos = NULL_TREE; |
| } |
| } |
| /* Note that rtype could also be NULL_TREE. This happens if we are |
| messaging a class by name, but the class was only |
| forward-declared using @class. */ |
| |
| /* For 'id' or 'Class' receivers, search in the global hash table as |
| a last resort. For all receivers, warn if protocol searches have |
| failed. */ |
| if (!method_prototype) |
| { |
| if (rprotos) |
| warning (0, "%<%c%E%> not found in protocol(s)", |
| (class_tree ? '+' : '-'), |
| sel_name); |
| |
| if (!rtype) |
| method_prototype |
| = lookup_method_in_hash_lists (sel_name, class_tree != NULL_TREE); |
| } |
| |
| if (!method_prototype) |
| { |
| static bool warn_missing_methods = false; |
| |
| if (rtype) |
| warning (0, "%qE may not respond to %<%c%E%>", |
| OBJC_TYPE_NAME (rtype), |
| (class_tree ? '+' : '-'), |
| sel_name); |
| /* If we are messaging an 'id' or 'Class' object and made it here, |
| then we have failed to find _any_ instance or class method, |
| respectively. */ |
| else |
| warning (0, "no %<%c%E%> method found", |
| (class_tree ? '+' : '-'), |
| sel_name); |
| |
| if (!warn_missing_methods) |
| { |
| warning_at (input_location, |
| 0, "(messages without a matching method signature " |
| "will be assumed to return %<id%> and accept " |
| "%<...%> as arguments)"); |
| warn_missing_methods = true; |
| } |
| } |
| else |
| { |
| /* Warn if the method is deprecated, but not if the receiver is |
| a generic 'id'. 'id' is used to cast an object to a generic |
| object of an unspecified class; in that case, we'll use |
| whatever method prototype we can find to get the method |
| argument and return types, but it is not appropriate to |
| produce deprecation warnings since we don't know the class |
| that the object will be of at runtime. The @interface(s) for |
| that class may not even be available to the compiler right |
| now, and it is perfectly possible that the method is marked |
| as non-deprecated in such @interface(s). |
| |
| In practice this makes sense since casting an object to 'id' |
| is often used precisely to turn off warnings associated with |
| the object being of a particular class. */ |
| if (TREE_UNAVAILABLE (method_prototype) && rtype != NULL_TREE) |
| { |
| if (method_prototype_avail) |
| *method_prototype_avail = method_prototype; |
| else |
| error_unavailable_use (method_prototype, NULL_TREE); |
| } |
| else if (TREE_DEPRECATED (method_prototype) && rtype != NULL_TREE) |
| { |
| if (method_prototype_avail) |
| *method_prototype_avail = method_prototype; |
| else |
| warn_deprecated_use (method_prototype, NULL_TREE); |
| } |
| } |
| |
| /* Save the selector name for printing error messages. */ |
| current_objc_message_selector = sel_name; |
| |
| /* Build the method call. |
| TODO: Get the location from somewhere that will work for delayed |
| expansion. */ |
| |
| retval = (*runtime.build_objc_method_call) (input_location, method_prototype, |
| receiver, rtype, sel_name, |
| method_params, super); |
| |
| current_objc_message_selector = 0; |
| |
| return retval; |
| } |
| |
| |
| /* This routine creates a static variable used to implement @protocol(MyProtocol) |
| expression. This variable will be initialized to global protocol_t meta-data |
| pointer. */ |
| |
| /* This function is called by the parser when (and only when) a |
| @protocol() expression is found, in order to compile it. */ |
| tree |
| objc_build_protocol_expr (tree protoname) |
| { |
| tree p = lookup_protocol (protoname, /* warn if deprecated */ true, |
| /* definition_required */ false); |
| |
| if (!p) |
| { |
| error ("cannot find protocol declaration for %qE", protoname); |
| return error_mark_node; |
| } |
| |
| return (*runtime.get_protocol_reference) (input_location, p); |
| } |
| |
| /* This function is called by the parser when a @selector() expression |
| is found, in order to compile it. It is only called by the parser |
| and only to compile a @selector(). LOC is the location of the |
| @selector. */ |
| tree |
| objc_build_selector_expr (location_t loc, tree selnamelist) |
| { |
| tree selname; |
| |
| /* Obtain the full selector name. */ |
| switch (TREE_CODE (selnamelist)) |
| { |
| case IDENTIFIER_NODE: |
| /* A unary selector. */ |
| selname = selnamelist; |
| break; |
| case TREE_LIST: |
| selname = build_keyword_selector (selnamelist); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| /* If we are required to check @selector() expressions as they |
| are found, check that the selector has been declared. */ |
| if (warn_undeclared_selector) |
| { |
| /* Look the selector up in the list of all known class and |
| instance methods (up to this line) to check that the selector |
| exists. */ |
| tree method; |
| |
| /* First try with instance methods. */ |
| method = objc_map_get (instance_method_map, selname); |
| |
| /* If not found, try with class methods. */ |
| if (method == OBJC_MAP_NOT_FOUND) |
| { |
| method = objc_map_get (class_method_map, selname); |
| |
| /* If still not found, print out a warning. */ |
| if (method == OBJC_MAP_NOT_FOUND) |
| warning (0, "undeclared selector %qE", selname); |
| } |
| } |
| |
| /* The runtimes do this differently, most particularly, GNU has typed |
| selectors, whilst NeXT does not. */ |
| return (*runtime.build_selector_reference) (loc, selname, NULL_TREE); |
| } |
| |
| static tree |
| build_ivar_reference (tree id) |
| { |
| tree base; |
| if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL) |
| { |
| /* Historically, a class method that produced objects (factory |
| method) would assign `self' to the instance that it |
| allocated. This would effectively turn the class method into |
| an instance method. Following this assignment, the instance |
| variables could be accessed. That practice, while safe, |
| violates the simple rule that a class method should not refer |
| to an instance variable. It's better to catch the cases |
| where this is done unknowingly than to support the above |
| paradigm. */ |
| warning (0, "instance variable %qE accessed in class method", |
| id); |
| self_decl = convert (objc_instance_type, self_decl); /* cast */ |
| } |
| |
| base = build_indirect_ref (input_location, self_decl, RO_ARROW); |
| return (*runtime.build_ivar_reference) (input_location, base, id); |
| } |
| |
| static void |
| hash_init (void) |
| { |
| instance_method_map = objc_map_alloc_ggc (1000); |
| class_method_map = objc_map_alloc_ggc (1000); |
| |
| class_name_map = objc_map_alloc_ggc (200); |
| alias_name_map = objc_map_alloc_ggc (200); |
| |
| /* Initialize the hash table used to hold the constant string objects. */ |
| string_htab = hash_table<objc_string_hasher>::create_ggc (31); |
| } |
| |
| /* Use the following to add a method to class_method_map or |
| instance_method_map. It will add the method, keyed by the |
| METHOD_SEL_NAME. If the method already exists, but with one or |
| more different prototypes, it will store a TREE_VEC in the map, |
| with the method prototypes in the vector. */ |
| static void |
| insert_method_into_method_map (bool class_method, tree method) |
| { |
| tree method_name = METHOD_SEL_NAME (method); |
| tree existing_entry; |
| objc_map_t map; |
| |
| if (class_method) |
| map = class_method_map; |
| else |
| map = instance_method_map; |
| |
| /* Check if the method already exists in the map. */ |
| existing_entry = objc_map_get (map, method_name); |
| |
| /* If not, we simply add it to the map. */ |
| if (existing_entry == OBJC_MAP_NOT_FOUND) |
| objc_map_put (map, method_name, method); |
| else |
| { |
| tree new_entry; |
| |
| /* If an entry already exists, it's more complicated. We'll |
| have to check whether the method prototype is the same or |
| not. */ |
| if (TREE_CODE (existing_entry) != TREE_VEC) |
| { |
| /* If the method prototypes are the same, there is nothing |
| to do. */ |
| if (comp_proto_with_proto (method, existing_entry, 1)) |
| return; |
| |
| /* If not, create a vector to store both the method already |
| in the map, and the new one that we are adding. */ |
| new_entry = make_tree_vec (2); |
| |
| TREE_VEC_ELT (new_entry, 0) = existing_entry; |
| TREE_VEC_ELT (new_entry, 1) = method; |
| } |
| else |
| { |
| /* An entry already exists, and it's already a vector. This |
| means that at least 2 different method prototypes were |
| already found, and we're considering registering yet |
| another one. */ |
| size_t i; |
| |
| /* Check all the existing prototypes. If any matches the |
| one we need to add, there is nothing to do because it's |
| already there. */ |
| for (i = 0; i < (size_t) TREE_VEC_LENGTH (existing_entry); i++) |
| if (comp_proto_with_proto (method, TREE_VEC_ELT (existing_entry, i), 1)) |
| return; |
| |
| /* Else, create a new, bigger vector and add the new method |
| at the end of it. This is inefficient but extremely |
| rare; in any sane program most methods have a single |
| prototype, and very few, if any, will have more than |
| 2! */ |
| new_entry = make_tree_vec (TREE_VEC_LENGTH (existing_entry) + 1); |
| |
| /* Copy the methods from the existing vector. */ |
| for (i = 0; i < (size_t) TREE_VEC_LENGTH (existing_entry); i++) |
| TREE_VEC_ELT (new_entry, i) = TREE_VEC_ELT (existing_entry, i); |
| |
| /* Add the new method at the end. */ |
| TREE_VEC_ELT (new_entry, i) = method; |
| } |
| |
| /* Store the new vector in the map. */ |
| objc_map_put (map, method_name, new_entry); |
| } |
| } |
| |
| |
| static tree |
| lookup_method (tree mchain, tree method) |
| { |
| tree key; |
| |
| if (TREE_CODE (method) == IDENTIFIER_NODE) |
| key = method; |
| else |
| key = METHOD_SEL_NAME (method); |
| |
| while (mchain) |
| { |
| if (METHOD_SEL_NAME (mchain) == key) |
| return mchain; |
| |
| mchain = DECL_CHAIN (mchain); |
| } |
| return NULL_TREE; |
| } |
| |
| /* Look up a class (if OBJC_LOOKUP_CLASS is set in FLAGS) or instance |
| method in INTERFACE, along with any categories and protocols |
| attached thereto. If method is not found, and the |
| OBJC_LOOKUP_NO_SUPER is _not_ set in FLAGS, recursively examine the |
| INTERFACE's superclass. If OBJC_LOOKUP_CLASS is set, |
| OBJC_LOOKUP_NO_SUPER is clear, and no suitable class method could |
| be found in INTERFACE or any of its superclasses, look for an |
| _instance_ method of the same name in the root class as a last |
| resort. This behavior can be turned off by using |
| OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS. |
| |
| If a suitable method cannot be found, return NULL_TREE. */ |
| |
| static tree |
| lookup_method_static (tree interface, tree ident, int flags) |
| { |
| tree meth = NULL_TREE, root_inter = NULL_TREE; |
| tree inter = interface; |
| int is_class = (flags & OBJC_LOOKUP_CLASS); |
| int no_superclasses = (flags & OBJC_LOOKUP_NO_SUPER); |
| int no_instance_methods_of_root_class = (flags & OBJC_LOOKUP_NO_INSTANCE_METHODS_OF_ROOT_CLASS); |
| |
| while (inter) |
| { |
| tree chain = is_class ? CLASS_CLS_METHODS (inter) : CLASS_NST_METHODS (inter); |
| tree category = inter; |
| |
| /* First, look up the method in the class itself. */ |
| if ((meth = lookup_method (chain, ident))) |
| return meth; |
| |
| /* Failing that, look for the method in each category of the class. */ |
| while ((category = CLASS_CATEGORY_LIST (category))) |
| { |
| chain = is_class ? CLASS_CLS_METHODS (category) : CLASS_NST_METHODS (category); |
| |
| /* Check directly in each category. */ |
| if ((meth = lookup_method (chain, ident))) |
| return meth; |
| |
| /* Failing that, check in each category's protocols. */ |
| if (CLASS_PROTOCOL_LIST (category)) |
| { |
| if ((meth = (lookup_method_in_protocol_list |
| (CLASS_PROTOCOL_LIST (category), ident, is_class)))) |
| return meth; |
| } |
| } |
| |
| /* If not found in categories, check in protocols of the main class. */ |
| if (CLASS_PROTOCOL_LIST (inter)) |
| { |
| if ((meth = (lookup_method_in_protocol_list |
| (CLASS_PROTOCOL_LIST (inter), ident, is_class)))) |
| return meth; |
| } |
| |
| /* If we were instructed not to look in superclasses, don't. */ |
| if (no_superclasses) |
| return NULL_TREE; |
| |
| /* Failing that, climb up the inheritance hierarchy. */ |
| root_inter = inter; |
| inter = lookup_interface (CLASS_SUPER_NAME (inter)); |
| } |
| while (inter); |
| |
| if (is_class && !no_instance_methods_of_root_class) |
| { |
| /* If no class (factory) method was found, check if an _instance_ |
| method of the same name exists in the root class. This is what |
| the Objective-C runtime will do. */ |
| return lookup_method_static (root_inter, ident, 0); |
| } |
| else |
| { |
| /* If an instance method was not found, return 0. */ |
| return NULL_TREE; |
| } |
| } |
| |
| static tree |
| objc_add_method (tree klass, tree method, int is_class, bool is_optional) |
| { |
| tree existing_method = NULL_TREE; |
| |
| /* The first thing we do is look up the method in the list of |
| methods already defined in the interface (or implementation). */ |
| if (is_class) |
| existing_method = lookup_method (CLASS_CLS_METHODS (klass), method); |
| else |
| existing_method = lookup_method (CLASS_NST_METHODS (klass), method); |
| |
| /* In the case of protocols, we have a second list of methods to |
| consider, the list of optional ones. */ |
| if (TREE_CODE (klass) == PROTOCOL_INTERFACE_TYPE) |
| { |
| /* @required methods are added to the protocol's normal list. |
| @optional methods are added to the protocol's OPTIONAL lists. |
| Note that adding the methods to the optional lists disables |
| checking that the methods are implemented by classes |
| implementing the protocol, since these checks only use the |
| CLASS_CLS_METHODS and CLASS_NST_METHODS. */ |
| |
| /* First of all, if the method to add is @optional, and we found |
| it already existing as @required, emit an error. */ |
| if (is_optional && existing_method) |
| { |
| error ("method %<%c%E%> declared %<@optional%> and %<@required%> at the same time", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (existing_method)); |
| inform (DECL_SOURCE_LOCATION (existing_method), |
| "previous declaration of %<%c%E%> as %<@required%>", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (existing_method)); |
| } |
| |
| /* Now check the list of @optional methods if we didn't find the |
| method in the @required list. */ |
| if (!existing_method) |
| { |
| if (is_class) |
| existing_method = lookup_method (PROTOCOL_OPTIONAL_CLS_METHODS (klass), method); |
| else |
| existing_method = lookup_method (PROTOCOL_OPTIONAL_NST_METHODS (klass), method); |
| |
| if (!is_optional && existing_method) |
| { |
| error ("method %<%c%E%> declared %<@optional%> and %<@required%> at the same time", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (existing_method)); |
| inform (DECL_SOURCE_LOCATION (existing_method), |
| "previous declaration of %<%c%E%> as %<@optional%>", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (existing_method)); |
| } |
| } |
| } |
| |
| /* If the method didn't exist already, add it. */ |
| if (!existing_method) |
| { |
| if (is_optional) |
| { |
| if (is_class) |
| { |
| /* Put the method on the list in reverse order. */ |
| TREE_CHAIN (method) = PROTOCOL_OPTIONAL_CLS_METHODS (klass); |
| PROTOCOL_OPTIONAL_CLS_METHODS (klass) = method; |
| } |
| else |
| { |
| TREE_CHAIN (method) = PROTOCOL_OPTIONAL_NST_METHODS (klass); |
| PROTOCOL_OPTIONAL_NST_METHODS (klass) = method; |
| } |
| } |
| else |
| { |
| if (is_class) |
| { |
| DECL_CHAIN (method) = CLASS_CLS_METHODS (klass); |
| CLASS_CLS_METHODS (klass) = method; |
| } |
| else |
| { |
| DECL_CHAIN (method) = CLASS_NST_METHODS (klass); |
| CLASS_NST_METHODS (klass) = method; |
| } |
| } |
| } |
| else |
| { |
| /* The method was already defined. Check that the types match |
| for an @interface for a class or category, or for a |
| @protocol. Give hard errors on methods with identical |
| selectors but differing argument and/or return types. We do |
| not do this for @implementations, because C/C++ will do it |
| for us (i.e., there will be duplicate function definition |
| errors). */ |
| if ((TREE_CODE (klass) == CLASS_INTERFACE_TYPE |
| || TREE_CODE (klass) == CATEGORY_INTERFACE_TYPE |
| /* Starting with GCC 4.6, we emit the same error for |
| protocols too. The situation is identical to |
| @interfaces as there is no possible meaningful reason |
| for defining the same method with different signatures |
| in the very same @protocol. If that was allowed, |
| whenever the protocol is used (both at compile and run |
| time) there wouldn't be any meaningful way to decide |
| which of the two method signatures should be used. */ |
| || TREE_CODE (klass) == PROTOCOL_INTERFACE_TYPE) |
| && !comp_proto_with_proto (method, existing_method, 1)) |
| { |
| error ("duplicate declaration of method %<%c%E%> with conflicting types", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (existing_method)); |
| inform (DECL_SOURCE_LOCATION (existing_method), |
| "previous declaration of %<%c%E%>", |
| (is_class ? '+' : '-'), |
| METHOD_SEL_NAME (existing_method)); |
| } |
| } |
| |
| if (is_class) |
| insert_method_into_method_map (true, method); |
| else |
| { |
| insert_method_into_method_map (false, method); |
| |
| /* Instance methods in root classes (and categories thereof) |
| may act as class methods as a last resort. We also add |
| instance methods listed in @protocol declarations to |
| the class hash table, on the assumption that @protocols |
| may be adopted by root classes or categories. */ |
| if (TREE_CODE (klass) == CATEGORY_INTERFACE_TYPE |
| || TREE_CODE (klass) == CATEGORY_IMPLEMENTATION_TYPE) |
| klass = lookup_interface (CLASS_NAME (klass)); |
| |
| if (TREE_CODE (klass) == PROTOCOL_INTERFACE_TYPE |
| || !CLASS_SUPER_NAME (klass)) |
| insert_method_into_method_map (true, method); |
| } |
| |
| return method; |
| } |
| |
| static void |
| add_category (tree klass, tree category) |
| { |
| /* Put categories on list in reverse order. */ |
| tree cat = lookup_category (klass, CLASS_SUPER_NAME (category)); |
| |
| if (cat) |
| { |
| warning (0, "duplicate interface declaration for category %<%E(%E)%>", |
| CLASS_NAME (klass), |
| CLASS_SUPER_NAME (category)); |
| } |
| else |
| { |
| CLASS_CATEGORY_LIST (category) = CLASS_CATEGORY_LIST (klass); |
| CLASS_CATEGORY_LIST (klass) = category; |
| } |
| } |
| |
| #ifndef OBJCPLUS |
| /* A flexible array member is a C99 extension where you can use |
| "type[]" at the end of a struct to mean a variable-length array. |
| |
| In Objective-C, instance variables are fundamentally members of a |
| struct, but the struct can always be extended by subclassing; hence |
| we need to detect and forbid all instance variables declared using |
| flexible array members. |
| |
| No check for this is needed in Objective-C++, since C++ does not |
| have flexible array members. */ |
| |
| /* Determine whether TYPE is a structure with a flexible array member, |
| a union containing such a structure (possibly recursively) or an |
| array of such structures or unions. These are all invalid as |
| instance variable. */ |
| static bool |
| flexible_array_type_p (tree type) |
| { |
| tree x; |
| switch (TREE_CODE (type)) |
| { |
| case RECORD_TYPE: |
| x = TYPE_FIELDS (type); |
| if (x == NULL_TREE) |
| return false; |
| while (DECL_CHAIN (x) != NULL_TREE) |
| x = DECL_CHAIN (x); |
| if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
| && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE |
| && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE |
| && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) |
| return true; |
| return false; |
| case UNION_TYPE: |
| for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x)) |
| { |
| if (flexible_array_type_p (TREE_TYPE (x))) |
| return true; |
| } |
| return false; |
| /* Note that we also check for arrays of something that uses a flexible array member. */ |
| case ARRAY_TYPE: |
| if (flexible_array_type_p (TREE_TYPE (type))) |
| return true; |
| return false; |
| default: |
| return false; |
| } |
| } |
| #endif |
| |
| /* Produce a printable version of an ivar name. This is only used |
| inside add_instance_variable. */ |
| static const char * |
| printable_ivar_name (tree field_decl) |
| { |
| if (DECL_NAME (field_decl)) |
| return identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (field_decl))); |
| else |
| return _("<unnamed>"); |
| } |
| |
| /* Called after parsing each instance variable declaration. Necessary to |
| preserve typedefs and implement public/private... |
| |
| VISIBILITY is 1 for public, 0 for protected, and 2 for private. */ |
| |
| static tree |
| add_instance_variable (tree klass, objc_ivar_visibility_kind visibility, |
| tree field_decl) |
| { |
| tree field_type = TREE_TYPE (field_decl); |
| |
| #ifdef OBJCPLUS |
| if (TREE_CODE (field_type) == REFERENCE_TYPE) |
| { |
| error ("illegal reference type specified for instance variable %qs", |
| printable_ivar_name (field_decl)); |
| /* Return class as is without adding this ivar. */ |
| return klass; |
| } |
| #endif |
| |
| if (field_type == error_mark_node || !TYPE_SIZE (field_type) |
| || TYPE_SIZE (field_type) == error_mark_node) |
| /* 'type[0]' is allowed, but 'type[]' is not! */ |
| { |
| error ("instance variable %qs has unknown size", |
| printable_ivar_name (field_decl)); |
| /* Return class as is without adding this ivar. */ |
| return klass; |
| } |
| |
| #ifndef OBJCPLUS |
| /* Also, in C reject a struct with a flexible array member. Ie, |
| |
| struct A { int x; int[] y; }; |
| |
| @interface X |
| { |
| struct A instance_variable; |
| } |
| @end |
| |
| is not valid because if the class is subclassed, we wouldn't be able |
| to calculate the offset of the next instance variable. */ |
| if (flexible_array_type_p (field_type)) |
| { |
| error ("instance variable %qs uses flexible array member", |
| printable_ivar_name (field_decl)); |
| /* Return class as is without adding this ivar. */ |
| return klass; |
| } |
| #endif |
| |
| #ifdef OBJCPLUS |
| /* Check if the ivar being added has a non-POD C++ type. If so, we will |
| need to either (1) warn the user about it or (2) generate suitable |
| constructor/destructor call from '- .cxx_construct' or '- .cxx_destruct' |
| methods (if '-fobjc-call-cxx-cdtors' was specified). */ |
| if (MAYBE_CLASS_TYPE_P (field_type) |
| && (TYPE_NEEDS_CONSTRUCTING (field_type) |
| || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type) |
| || TYPE_POLYMORPHIC_P (field_type))) |
| { |
| tree type_name = OBJC_TYPE_NAME (field_type); |
| |
| if (flag_objc_call_cxx_cdtors) |
| { |
| /* Since the ObjC runtime will be calling the constructors and |
| destructors for us, the only thing we can't handle is the lack |
| of a default constructor. */ |
| if (TYPE_NEEDS_CONSTRUCTING (field_type) |
| && !TYPE_HAS_DEFAULT_CONSTRUCTOR (field_type)) |
| { |
| warning (0, "type %qE has no default constructor to call", |
| type_name); |
| |
| /* If we cannot call a constructor, we should also avoid |
| calling the destructor, for symmetry. */ |
| if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type)) |
| warning (0, "destructor for %qE shall not be run either", |
| type_name); |
| } |
| } |
| else |
| { |
| static bool warn_cxx_ivars = false; |
| |
| if (TYPE_POLYMORPHIC_P (field_type)) |
| { |
| /* Vtable pointers are Real Bad(tm), since Obj-C cannot |
| initialize them. */ |
| error ("type %qE has virtual member functions", type_name); |
| error ("illegal aggregate type %qE specified " |
| "for instance variable %qs", |
| type_name, printable_ivar_name (field_decl)); |
| /* Return class as is without adding this ivar. */ |
| return klass; |
| } |
| |
| /* User-defined constructors and destructors are not known to Obj-C |
| and hence will not be called. This may or may not be a problem. */ |
| if (TYPE_NEEDS_CONSTRUCTING (field_type)) |
| warning (0, "type %qE has a user-defined constructor", type_name); |
| if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (field_type)) |
| warning (0, "type %qE has a user-defined destructor", type_name); |
| |
| if (!warn_cxx_ivars) |
| { |
| warning (0, "C++ constructors and destructors will not " |
| "be invoked for Objective-C fields"); |
| warn_cxx_ivars = true; |
| } |
| } |
| } |
| #endif |
| |
| /* Overload the public attribute, it is not used for FIELD_DECLs. */ |
| switch (visibility) |
| { |
| case OBJC_IVAR_VIS_PROTECTED: |
| TREE_PUBLIC (field_decl) = 0; |
| TREE_PRIVATE (field_decl) = 0; |
| TREE_PROTECTED (field_decl) = 1; |
| break; |
| |
| case OBJC_IVAR_VIS_PACKAGE: |
| /* TODO: Implement the package variant. */ |
| case OBJC_IVAR_VIS_PUBLIC: |
| TREE_PUBLIC (field_decl) = 1; |
| TREE_PRIVATE (field_decl) = 0; |
| TREE_PROTECTED (field_decl) = 0; |
| break; |
| |
| case OBJC_IVAR_VIS_PRIVATE: |
| TREE_PUBLIC (field_decl) = 0; |
| TREE_PRIVATE (field_decl) = 1; |
| TREE_PROTECTED (field_decl) = 0; |
| break; |
| |
| } |
| |
| CLASS_RAW_IVARS (klass) = chainon (CLASS_RAW_IVARS (klass), field_decl); |
| |
| return klass; |
| } |
| |
| /* True if the ivar is private and we are not in its implementation. */ |
| |
| static int |
| is_private (tree decl) |
| { |
| return (TREE_PRIVATE (decl) |
| && ! is_ivar (CLASS_IVARS (implementation_template), |
| DECL_NAME (decl))); |
| } |
| |
| /* Searches all the instance variables of 'klass' and of its |
| superclasses for an instance variable whose name (identifier) is |
| 'ivar_name_ident'. Return the declaration (DECL) of the instance |
| variable, if found, or NULL_TREE, if not found. */ |
| static inline tree |
| ivar_of_class (tree klass, tree ivar_name_ident) |
| { |
| /* First, look up the ivar in CLASS_RAW_IVARS. */ |
| tree decl_chain = CLASS_RAW_IVARS (klass); |
| |
| for ( ; decl_chain; decl_chain = DECL_CHAIN (decl_chain)) |
| if (DECL_NAME (decl_chain) == ivar_name_ident) |
| return decl_chain; |
| |
| /* If not found, search up the class hierarchy. */ |
| while (CLASS_SUPER_NAME (klass)) |
| { |
| klass = lookup_interface (CLASS_SUPER_NAME (klass)); |
| |
| decl_chain = CLASS_RAW_IVARS (klass); |
| |
| for ( ; decl_chain; decl_chain = DECL_CHAIN (decl_chain)) |
| if (DECL_NAME (decl_chain) == ivar_name_ident) |
| return decl_chain; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* We have an instance variable reference;, check to see if it is public. */ |
| |
| int |
| objc_is_public (tree expr, tree identifier) |
| { |
| tree basetype, decl; |
| |
| #ifdef OBJCPLUS |
| if (processing_template_decl) |
| return 1; |
| #endif |
| |
| if (TREE_TYPE (expr) == error_mark_node) |
| return 1; |
| |
| basetype = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); |
| |
| if (basetype && TREE_CODE (basetype) == RECORD_TYPE) |
| { |
| if (TYPE_HAS_OBJC_INFO (basetype) && TYPE_OBJC_INTERFACE (basetype)) |
| { |
| tree klass = lookup_interface (OBJC_TYPE_NAME (basetype)); |
| |
| if (!klass) |
| { |
| error ("cannot find interface declaration for %qE", |
| OBJC_TYPE_NAME (basetype)); |
| return 0; |
| } |
| |
| if ((decl = ivar_of_class (klass, identifier))) |
| { |
| if (TREE_PUBLIC (decl)) |
| return 1; |
| |
| /* Important difference between the Stepstone translator: |
| all instance variables should be public within the context |
| of the implementation. */ |
| if (objc_implementation_context |
| && ((TREE_CODE (objc_implementation_context) |
| == CLASS_IMPLEMENTATION_TYPE) |
| || (TREE_CODE (objc_implementation_context) |
| == CATEGORY_IMPLEMENTATION_TYPE))) |
| { |
| tree curtype = TYPE_MAIN_VARIANT |
| (CLASS_STATIC_TEMPLATE |
| (implementation_template)); |
| |
| if (basetype == curtype |
| || DERIVED_FROM_P (basetype, curtype)) |
| { |
| int priv = is_private (decl); |
| |
| if (priv) |
| error ("instance variable %qE is declared private", |
| DECL_NAME (decl)); |
| |
| return !priv; |
| } |
| } |
| |
| /* The 2.95.2 compiler sometimes allowed C functions to access |
| non-@public ivars. We will let this slide for now... */ |
| if (!objc_method_context) |
| { |
| warning (0, "instance variable %qE is %s; " |
| "this will be a hard error in the future", |
| identifier, |
| TREE_PRIVATE (decl) ? "@private" : "@protected"); |
| return 1; |
| } |
| |
| error ("instance variable %qE is declared %s", |
| identifier, |
| TREE_PRIVATE (decl) ? "private" : "protected"); |
| return 0; |
| } |
| } |
| } |
| |
| return 1; |
| } |
| |
| /* Make sure all methods in CHAIN (a list of method declarations from |
| an @interface or a @protocol) are in IMPLEMENTATION (the |
| implementation context). This is used to check for example that |
| all methods declared in an @interface were implemented in an |
| @implementation. |
| |
| Some special methods (property setters/getters) are special and if |
| they are not found in IMPLEMENTATION, we look them up in its |
| superclasses. */ |
| |
| static int |
| check_methods (tree chain, tree implementation, int mtype) |
| { |
| int first = 1; |
| tree list; |
| |
| if (mtype == (int)'+') |
| list = CLASS_CLS_METHODS (implementation); |
| else |
| list = CLASS_NST_METHODS (implementation); |
| |
| while (chain) |
| { |
| /* If the method is associated with a dynamic property, then it |
| is Ok not to have the method implementation, as it will be |
| generated dynamically at runtime. To decide if the method is |
| associated with a @dynamic property, we search the list of |
| @synthesize and @dynamic for this implementation, and look |
| for any @dynamic property with the same setter or getter name |
| as this method. */ |
| tree x; |
| for (x = IMPL_PROPERTY_DECL (implementation); x; x = TREE_CHAIN (x)) |
| if (PROPERTY_DYNAMIC (x) |
| && (PROPERTY_GETTER_NAME (x) == METHOD_SEL_NAME (chain) |
| || PROPERTY_SETTER_NAME (x) == METHOD_SEL_NAME (chain))) |
| break; |
| |
| if (x != NULL_TREE) |
| { |
| chain = TREE_CHAIN (chain); /* next method... */ |
| continue; |
| } |
| |
| if (!lookup_method (list, chain)) |
| { |
| /* If the method is a property setter/getter, we'll still |
| allow it to be missing if it is implemented by |
| 'interface' or any of its superclasses. */ |
| tree property = METHOD_PROPERTY_CONTEXT (chain); |
| if (property) |
| { |
| /* Note that since this is a property getter/setter, it |
| is obviously an instance method. */ |
| tree interface = NULL_TREE; |
| |
| /* For a category, first check the main class |
| @interface. */ |
| if (TREE_CODE (implementation) == CATEGORY_IMPLEMENTATION_TYPE) |
| { |
| interface = lookup_interface (CLASS_NAME (implementation)); |
| |
| /* If the method is found in the main class, it's Ok. */ |
| if (lookup_method (CLASS_NST_METHODS (interface), chain)) |
| { |
| chain = DECL_CHAIN (chain); |
| continue; |
| } |
| |
| /* Else, get the superclass. */ |
| if (CLASS_SUPER_NAME (interface)) |
| interface = lookup_interface (CLASS_SUPER_NAME (interface)); |
| else |
| interface = NULL_TREE; |
| } |
| |
| /* Get the superclass for classes. */ |
| if (TREE_CODE (implementation) == CLASS_IMPLEMENTATION_TYPE) |
| { |
| if (CLASS_SUPER_NAME (implementation)) |
| interface = lookup_interface (CLASS_SUPER_NAME (implementation)); |
| else |
| interface = NULL_TREE; |
| } |
| |
| /* Now, interface is the superclass, if any; go check it. */ |
| if (interface) |
| { |
| if (lookup_method_static (interface, chain, 0)) |
| { |
| chain = DECL_CHAIN (chain); |
| continue; |
| } |
| } |
| /* Else, fall through - warn. */ |
| } |
| if (first) |
| { |
| switch (TREE_CODE (implementation)) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| warning (0, "incomplete implementation of class %qE", |
| CLASS_NAME (implementation)); |
| break; |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| warning (0, "incomplete implementation of category %qE", |
| CLASS_SUPER_NAME (implementation)); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| first = 0; |
| } |
| |
| warning (0, "method definition for %<%c%E%> not found", |
| mtype, METHOD_SEL_NAME (chain)); |
| } |
| |
| chain = DECL_CHAIN (chain); |
| } |
| |
| return first; |
| } |
| |
| /* Check if KLASS, or its superclasses, explicitly conforms to PROTOCOL. */ |
| |
| static int |
| conforms_to_protocol (tree klass, tree protocol) |
| { |
| if (TREE_CODE (protocol) == PROTOCOL_INTERFACE_TYPE) |
| { |
| tree p = CLASS_PROTOCOL_LIST (klass); |
| while (p && TREE_VALUE (p) != protocol) |
| p = TREE_CHAIN (p); |
| |
| if (!p) |
| { |
| tree super = (CLASS_SUPER_NAME (klass) |
| ? lookup_interface (CLASS_SUPER_NAME (klass)) |
| : NULL_TREE); |
| int tmp = super ? conforms_to_protocol (super, protocol) : 0; |
| if (!tmp) |
| return 0; |
| } |
| } |
| |
| return 1; |
| } |
| |
| /* Make sure all methods in CHAIN are accessible as MTYPE methods in |
| CONTEXT. This is one of two mechanisms to check protocol integrity. */ |
| |
| static int |
| check_methods_accessible (tree chain, tree context, int mtype) |
| { |
| int first = 1; |
| tree list; |
| tree base_context = context; |
| |
| while (chain) |
| { |
| /* If the method is associated with a dynamic property, then it |
| is Ok not to have the method implementation, as it will be |
| generated dynamically at runtime. Search for any @dynamic |
| property with the same setter or getter name as this |
| method. TODO: Use a hashtable lookup. */ |
| tree x; |
| for (x = IMPL_PROPERTY_DECL (base_context); x; x = TREE_CHAIN (x)) |
| if (PROPERTY_DYNAMIC (x) |
| && (PROPERTY_GETTER_NAME (x) == METHOD_SEL_NAME (chain) |
| || PROPERTY_SETTER_NAME (x) == METHOD_SEL_NAME (chain))) |
| break; |
| |
| if (x != NULL_TREE) |
| { |
| chain = TREE_CHAIN (chain); /* next method... */ |
| continue; |
| } |
| |
| context = base_context; |
| while (context) |
| { |
| if (mtype == '+') |
| list = CLASS_CLS_METHODS (context); |
| else |
| list = CLASS_NST_METHODS (context); |
| |
| if (lookup_method (list, chain)) |
| break; |
| |
| switch (TREE_CODE (context)) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| case CLASS_INTERFACE_TYPE: |
| context = (CLASS_SUPER_NAME (context) |
| ? lookup_interface (CLASS_SUPER_NAME (context)) |
| : NULL_TREE); |
| break; |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| case CATEGORY_INTERFACE_TYPE: |
| context = (CLASS_NAME (context) |
| ? lookup_interface (CLASS_NAME (context)) |
| : NULL_TREE); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| if (context == NULL_TREE) |
| { |
| if (first) |
| { |
| switch (TREE_CODE (objc_implementation_context)) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| warning (0, "incomplete implementation of class %qE", |
| CLASS_NAME (objc_implementation_context)); |
| break; |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| warning (0, "incomplete implementation of category %qE", |
| CLASS_SUPER_NAME (objc_implementation_context)); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| first = 0; |
| } |
| warning (0, "method definition for %<%c%E%> not found", |
| mtype, METHOD_SEL_NAME (chain)); |
| } |
| |
| chain = TREE_CHAIN (chain); /* next method... */ |
| } |
| return first; |
| } |
| |
| /* Check whether the current interface (accessible via |
| 'objc_implementation_context') actually implements protocol P, along |
| with any protocols that P inherits. */ |
| |
| static void |
| check_protocol (tree p, const char *type, tree name) |
| { |
| if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE) |
| { |
| int f1, f2; |
| |
| /* Ensure that all protocols have bodies! */ |
| if (warn_protocol) |
| { |
| f1 = check_methods (PROTOCOL_CLS_METHODS (p), |
| objc_implementation_context, |
| '+'); |
| f2 = check_methods (PROTOCOL_NST_METHODS (p), |
| objc_implementation_context, |
| '-'); |
| } |
| else |
| { |
| f1 = check_methods_accessible (PROTOCOL_CLS_METHODS (p), |
| objc_implementation_context, |
| '+'); |
| f2 = check_methods_accessible (PROTOCOL_NST_METHODS (p), |
| objc_implementation_context, |
| '-'); |
| } |
| |
| if (!f1 || !f2) |
| warning (0, "%s %qE does not fully implement the %qE protocol", |
| type, name, PROTOCOL_NAME (p)); |
| } |
| |
| /* Check protocols recursively. */ |
| if (PROTOCOL_LIST (p)) |
| { |
| tree subs = PROTOCOL_LIST (p); |
| tree super_class = |
| lookup_interface (CLASS_SUPER_NAME (implementation_template)); |
| |
| while (subs) |
| { |
| tree sub = TREE_VALUE (subs); |
| |
| /* If the superclass does not conform to the protocols |
| inherited by P, then we must! */ |
| if (!super_class || !conforms_to_protocol (super_class, sub)) |
| check_protocol (sub, type, name); |
| subs = TREE_CHAIN (subs); |
| } |
| } |
| } |
| |
| /* Check whether the current interface (accessible via |
| 'objc_implementation_context') actually implements the protocols listed |
| in PROTO_LIST. */ |
| |
| static void |
| check_protocols (tree proto_list, const char *type, tree name) |
| { |
| for ( ; proto_list; proto_list = TREE_CHAIN (proto_list)) |
| { |
| tree p = TREE_VALUE (proto_list); |
| |
| check_protocol (p, type, name); |
| } |
| } |
| |
| /* Make sure that the class CLASS_NAME is defined CODE says which kind |
| of thing CLASS_NAME ought to be. It can be CLASS_INTERFACE_TYPE, |
| CLASS_IMPLEMENTATION_TYPE, CATEGORY_INTERFACE_TYPE, or |
| CATEGORY_IMPLEMENTATION_TYPE. For a CATEGORY_INTERFACE_TYPE, |
| SUPER_NAME is the name of the category. For a class extension, |
| CODE is CATEGORY_INTERFACE_TYPE and SUPER_NAME is NULL_TREE. */ |
| static tree |
| start_class (enum tree_code code, tree class_name, tree super_name, |
| tree protocol_list, tree attributes) |
| { |
| tree klass = NULL_TREE; |
| tree decl; |
| |
| #ifdef OBJCPLUS |
| if (current_namespace != global_namespace) |
| { |
| error ("Objective-C declarations may only appear in global scope"); |
| } |
| #endif /* OBJCPLUS */ |
| |
| if (objc_implementation_context) |
| { |
| warning (0, "%<@end%> missing in implementation context"); |
| finish_class (objc_implementation_context); |
| objc_ivar_chain = NULL_TREE; |
| objc_implementation_context = NULL_TREE; |
| } |
| |
| /* If this is a class extension, we'll be "reopening" the existing |
| CLASS_INTERFACE_TYPE, so in that case there is no need to create |
| a new node. */ |
| if (code != CATEGORY_INTERFACE_TYPE || super_name != NULL_TREE) |
| { |
| klass = make_node (code); |
| TYPE_LANG_SLOT_1 (klass) = make_tree_vec (CLASS_LANG_SLOT_ELTS); |
| } |
| |
| /* Check for existence of the super class, if one was specified. Note |
| that we must have seen an @interface, not just a @class. If we |
| are looking at a @compatibility_alias, traverse it first. */ |
| if ((code == CLASS_INTERFACE_TYPE || code == CLASS_IMPLEMENTATION_TYPE) |
| && super_name) |
| { |
| tree super = objc_is_class_name (super_name); |
| tree super_interface = NULL_TREE; |
| |
| if (super) |
| super_interface = lookup_interface (super); |
| |
| if (!super_interface) |
| { |
| error ("cannot find interface declaration for %qE, superclass of %qE", |
| super ? super : super_name, |
| class_name); |
| super_name = NULL_TREE; |
| } |
| else |
| { |
| if (TREE_UNAVAILABLE (super_interface)) |
| error ("class %qE is not available", super); |
| else if (TREE_DEPRECATED (super_interface)) |
| warning (OPT_Wdeprecated_declarations, "class %qE is deprecated", |
| super); |
| super_name = super; |
| } |
| } |
| |
| if (code != CATEGORY_INTERFACE_TYPE || super_name != NULL_TREE) |
| { |
| CLASS_NAME (klass) = class_name; |
| CLASS_SUPER_NAME (klass) = super_name; |
| CLASS_CLS_METHODS (klass) = NULL_TREE; |
| } |
| |
| if (! objc_is_class_name (class_name) |
| && (decl = lookup_name (class_name))) |
| { |
| error ("%qE redeclared as different kind of symbol", |
| class_name); |
| error ("previous declaration of %q+D", |
| decl); |
| } |
| |
| switch (code) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| { |
| tree chain; |
| |
| for (chain = implemented_classes; chain; chain = TREE_CHAIN (chain)) |
| if (TREE_VALUE (chain) == class_name) |
| { |
| error ("reimplementation of class %qE", |
| class_name); |
| /* TODO: error message saying where it was previously |
| implemented. */ |
| break; |
| } |
| if (chain == NULL_TREE) |
| implemented_classes = tree_cons (NULL_TREE, class_name, |
| implemented_classes); |
| } |
| |
| /* Reset for multiple classes per file. */ |
| method_slot = 0; |
| |
| objc_implementation_context = klass; |
| |
| /* Lookup the interface for this implementation. */ |
| |
| if (!(implementation_template = lookup_interface (class_name))) |
| { |
| warning (0, "cannot find interface declaration for %qE", |
| class_name); |
| add_interface (implementation_template = objc_implementation_context, |
| class_name); |
| } |
| |
| /* If a super class has been specified in the implementation, |
| insure it conforms to the one specified in the interface. */ |
| |
| if (super_name |
| && (super_name != CLASS_SUPER_NAME (implementation_template))) |
| { |
| tree previous_name = CLASS_SUPER_NAME (implementation_template); |
| error ("conflicting super class name %qE", |
| super_name); |
| if (previous_name) |
| error ("previous declaration of %qE", previous_name); |
| else |
| error ("previous declaration"); |
| } |
| |
| else if (! super_name) |
| { |
| CLASS_SUPER_NAME (objc_implementation_context) |
| = CLASS_SUPER_NAME (implementation_template); |
| } |
| |
| if (!CLASS_SUPER_NAME (objc_implementation_context) |
| && !lookup_attribute ("objc_root_class", |
| TYPE_ATTRIBUTES (implementation_template))) |
| warning (OPT_Wobjc_root_class, "class %qE defined without" |
| " specifying a base class", class_name); |
| break; |
| |
| case CLASS_INTERFACE_TYPE: |
| if (lookup_interface (class_name)) |
| #ifdef OBJCPLUS |
| error ("duplicate interface declaration for class %qE", class_name); |
| #else |
| warning (0, "duplicate interface declaration for class %qE", class_name); |
| #endif |
| else |
| add_interface (klass, class_name); |
| |
| if (protocol_list) |
| CLASS_PROTOCOL_LIST (klass) |
| = lookup_and_install_protocols (protocol_list, /* definition_required */ true); |
| |
| if (attributes) |
| { |
| tree attribute; |
| for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) |
| { |
| tree name = TREE_PURPOSE (attribute); |
| |
| /* TODO: Document what the objc_exception attribute is/does. */ |
| /* We handle the 'deprecated', 'visibility' and (undocumented) |
| 'objc_exception' attributes. */ |
| if (is_attribute_p ("unavailable", name)) |
| TREE_UNAVAILABLE (klass) = 1; |
| else if (is_attribute_p ("deprecated", name)) |
| TREE_DEPRECATED (klass) = 1; |
| else if (is_attribute_p ("objc_exception", name)) |
| CLASS_HAS_EXCEPTION_ATTR (klass) = 1; |
| else if (is_attribute_p ("objc_root_class", name)) |
| ; |
| else if (is_attribute_p ("visibility", name)) |
| ; |
| else |
| /* Warn about and ignore all others for now, but store them. */ |
| warning (OPT_Wattributes, "%qE attribute directive ignored", name); |
| } |
| TYPE_ATTRIBUTES (klass) = attributes; |
| } |
| break; |
| |
| case CATEGORY_INTERFACE_TYPE: |
| { |
| tree class_category_is_assoc_with; |
| |
| /* For a category, class_name is really the name of the class that |
| the following set of methods will be associated with. We must |
| find the interface so that can derive the objects template. */ |
| if (!(class_category_is_assoc_with = lookup_interface (class_name))) |
| { |
| error ("cannot find interface declaration for %qE", |
| class_name); |
| exit (FATAL_EXIT_CODE); |
| } |
| else |
| { |
| if (TREE_UNAVAILABLE (class_category_is_assoc_with)) |
| error ("class %qE is unavailable", class_name); |
| else if (TREE_DEPRECATED (class_category_is_assoc_with)) |
| warning (OPT_Wdeprecated_declarations, "class %qE is deprecated", |
| class_name); |
| |
| if (super_name == NULL_TREE) |
| { |
| /* This is a class extension. Get the original |
| interface, and continue working on it. */ |
| objc_in_class_extension = true; |
| klass = class_category_is_assoc_with; |
| |
| if (protocol_list) |
| { |
| /* Append protocols to the original protocol |
| list. */ |
| CLASS_PROTOCOL_LIST (klass) |
| = chainon (CLASS_PROTOCOL_LIST (klass), |
| lookup_and_install_protocols |
| (protocol_list, |
| /* definition_required */ true)); |
| } |
| } |
| else |
| { |
| add_category (class_category_is_assoc_with, klass); |
| |
| if (protocol_list) |
| CLASS_PROTOCOL_LIST (klass) |
| = lookup_and_install_protocols |
| (protocol_list, /* definition_required */ true); |
| } |
| } |
| } |
| break; |
| |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| /* Reset for multiple classes per file. */ |
| method_slot = 0; |
| |
| objc_implementation_context = klass; |
| |
| /* For a category, class_name is really the name of the class that |
| the following set of methods will be associated with. We must |
| find the interface so that can derive the objects template. */ |
| |
| if (!(implementation_template = lookup_interface (class_name))) |
| { |
| error ("cannot find interface declaration for %qE", |
| class_name); |
| exit (FATAL_EXIT_CODE); |
| } |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| return klass; |
| } |
| |
| static tree |
| continue_class (tree klass) |
| { |
| switch (TREE_CODE (klass)) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| { |
| struct imp_entry *imp_entry; |
| |
| /* Check consistency of the instance variables. */ |
| |
| if (CLASS_RAW_IVARS (klass)) |
| check_ivars (implementation_template, klass); |
| |
| /* code generation */ |
| #ifdef OBJCPLUS |
| push_lang_context (lang_name_c); |
| #endif |
| build_private_template (implementation_template); |
| uprivate_record = CLASS_STATIC_TEMPLATE (implementation_template); |
| objc_instance_type = build_pointer_type (uprivate_record); |
| |
| imp_entry = ggc_alloc<struct imp_entry> (); |
| |
| imp_entry->next = imp_list; |
| imp_entry->imp_context = klass; |
| imp_entry->imp_template = implementation_template; |
| ucls_super_ref = uucls_super_ref = NULL; |
| if (TREE_CODE (klass) == CLASS_IMPLEMENTATION_TYPE) |
| { |
| imp_entry->class_decl = (*runtime.class_decl) (klass); |
| imp_entry->meta_decl = (*runtime.metaclass_decl) (klass); |
| } |
| else |
| { |
| imp_entry->class_decl = (*runtime.category_decl) (klass); |
| imp_entry->meta_decl = NULL; |
| } |
| imp_entry->has_cxx_cdtors = 0; |
| |
| /* Append to front and increment count. */ |
| imp_list = imp_entry; |
| if (TREE_CODE (klass) == CLASS_IMPLEMENTATION_TYPE) |
| imp_count++; |
| else |
| cat_count++; |
| #ifdef OBJCPLUS |
| pop_lang_context (); |
| #endif /* OBJCPLUS */ |
| |
| return get_class_ivars (implementation_template, true); |
| } |
| case CLASS_INTERFACE_TYPE: |
| { |
| if (objc_in_class_extension) |
| return NULL_TREE; |
| #ifdef OBJCPLUS |
| push_lang_context (lang_name_c); |
| #endif /* OBJCPLUS */ |
| objc_collecting_ivars = 1; |
| build_private_template (klass); |
| objc_collecting_ivars = 0; |
| #ifdef OBJCPLUS |
| pop_lang_context (); |
| #endif /* OBJCPLUS */ |
| return NULL_TREE; |
| } |
| default: |
| return error_mark_node; |
| } |
| } |
| |
| /* This routine builds name of the setter synthesized function. */ |
| char * |
| objc_build_property_setter_name (tree ident) |
| { |
| /* TODO: Use alloca to allocate buffer of appropriate size. */ |
| static char string[BUFSIZE]; |
| sprintf (string, "set%s:", IDENTIFIER_POINTER (ident)); |
| string[3] = TOUPPER (string[3]); |
| return string; |
| } |
| |
| /* This routine prepares the declarations of the property accessor |
| helper functions (objc_getProperty(), etc) that are used when |
| @synthesize is used. |
| |
| runtime-specific routines are built in the respective runtime |
| initialize functions. */ |
| static void |
| build_common_objc_property_accessor_helpers (void) |
| { |
| tree type; |
| |
| /* Declare the following function: |
| id |
| objc_getProperty (id self, SEL _cmd, |
| ptrdiff_t offset, BOOL is_atomic); */ |
| type = build_function_type_list (objc_object_type, |
| objc_object_type, |
| objc_selector_type, |
| ptrdiff_type_node, |
| boolean_type_node, |
| NULL_TREE); |
| objc_getProperty_decl = add_builtin_function ("objc_getProperty", |
| type, 0, NOT_BUILT_IN, |
| NULL, NULL_TREE); |
| TREE_NOTHROW (objc_getProperty_decl) = 0; |
| |
| /* Declare the following function: |
| void |
| objc_setProperty (id self, SEL _cmd, |
| ptrdiff_t offset, id new_value, |
| BOOL is_atomic, BOOL should_copy); */ |
| type = build_function_type_list (void_type_node, |
| objc_object_type, |
| objc_selector_type, |
| ptrdiff_type_node, |
| objc_object_type, |
| boolean_type_node, |
| boolean_type_node, |
| NULL_TREE); |
| objc_setProperty_decl = add_builtin_function ("objc_setProperty", |
| type, 0, NOT_BUILT_IN, |
| NULL, NULL_TREE); |
| TREE_NOTHROW (objc_setProperty_decl) = 0; |
| } |
| |
| /* This looks up an ivar in a class (including superclasses). */ |
| static tree |
| lookup_ivar (tree interface, tree instance_variable_name) |
| { |
| while (interface) |
| { |
| tree decl_chain; |
| |
| for (decl_chain = CLASS_IVARS (interface); decl_chain; decl_chain = DECL_CHAIN (decl_chain)) |
| if (DECL_NAME (decl_chain) == instance_variable_name) |
| return decl_chain; |
| |
| /* Not found. Search superclass if any. */ |
| if (CLASS_SUPER_NAME (interface)) |
| interface = lookup_interface (CLASS_SUPER_NAME (interface)); |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* This routine synthesizes a 'getter' method. This is only called |
| for @synthesize properties. */ |
| static void |
| objc_synthesize_getter (tree klass, tree class_methods ATTRIBUTE_UNUSED, tree property) |
| { |
| location_t location = DECL_SOURCE_LOCATION (property); |
| tree fn, decl; |
| tree body; |
| tree ret_val; |
| |
| /* If user has implemented a getter with same name then do nothing. */ |
| if (lookup_method (CLASS_NST_METHODS (objc_implementation_context), |
| PROPERTY_GETTER_NAME (property))) |
| return; |
| |
| /* Find declaration of the property getter in the interface (or |
| superclass, or protocol). There must be one. */ |
| decl = lookup_method_static (klass, PROPERTY_GETTER_NAME (property), 0); |
| |
| /* If one not declared in the interface, this condition has already |
| been reported as user error (because property was not declared in |
| the interface). */ |
| if (!decl) |
| return; |
| |
| /* Adapt the 'decl'. Use the source location of the @synthesize |
| statement for error messages. */ |
| decl = copy_node (decl); |
| DECL_SOURCE_LOCATION (decl) = location; |
| |
| objc_start_method_definition (false /* is_class_method */, decl, NULL_TREE, |
| NULL_TREE); |
| body = c_begin_compound_stmt (true); |
| |
| /* Now we need to decide how we build the getter. There are three |
| cases: |
| |
| for 'copy' or 'retain' properties we need to use the |
| objc_getProperty() accessor helper which knows about retain and |
| copy. It supports both 'nonatomic' and 'atomic' access. |
| |
| for 'nonatomic, assign' properties we can access the instance |
| variable directly. 'nonatomic' means we don't have to use locks, |
| and 'assign' means we don't have to worry about retain or copy. |
| If you combine the two, it means we can just access the instance |
| variable directly. |
| |
| for 'atomic, assign' properties we use objc_copyStruct() (for the |
| next runtime) or objc_getPropertyStruct() (for the GNU runtime). */ |
| switch (PROPERTY_ASSIGN_SEMANTICS (property)) |
| { |
| case OBJC_PROPERTY_RETAIN: |
| case OBJC_PROPERTY_COPY: |
| { |
| /* We build "return objc_getProperty (self, _cmd, offset, is_atomic);" */ |
| tree cmd, ivar, offset, is_atomic; |
| cmd = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl)); |
| |
| /* Find the ivar to compute the offset. */ |
| ivar = lookup_ivar (klass, PROPERTY_IVAR_NAME (property)); |
| if (!ivar || is_private (ivar)) |
| { |
| /* This should never happen. */ |
| error_at (location, |
| "cannot find instance variable associated with property"); |
| ret_val = error_mark_node; |
| break; |
| } |
| offset = byte_position (ivar); |
| |
| if (PROPERTY_NONATOMIC (property)) |
| is_atomic = boolean_false_node; |
| else |
| is_atomic = boolean_true_node; |
| |
| ret_val = build_function_call |
| (location, |
| /* Function prototype. */ |
| objc_getProperty_decl, |
| /* Parameters. */ |
| tree_cons /* self */ |
| (NULL_TREE, self_decl, |
| tree_cons /* _cmd */ |
| (NULL_TREE, cmd, |
| tree_cons /* offset */ |
| (NULL_TREE, offset, |
| tree_cons /* is_atomic */ |
| (NULL_TREE, is_atomic, NULL_TREE))))); |
| } |
| break; |
| case OBJC_PROPERTY_ASSIGN: |
| if (PROPERTY_NONATOMIC (property)) |
| { |
| /* We build "return self->PROPERTY_IVAR_NAME;" */ |
| ret_val = objc_lookup_ivar (NULL_TREE, PROPERTY_IVAR_NAME (property)); |
| break; |
| } |
| else |
| { |
| /* We build |
| <property type> __objc_property_temp; |
| objc_getPropertyStruct (&__objc_property_temp, |
| &(self->PROPERTY_IVAR_NAME), |
| sizeof (type of self->PROPERTY_IVAR_NAME), |
| is_atomic, |
| false) |
| return __objc_property_temp; |
| |
| For the NeXT runtime, we need to use objc_copyStruct |
| instead of objc_getPropertyStruct. */ |
| tree objc_property_temp_decl, function_decl, function_call; |
| tree size_of, is_atomic; |
| |
| objc_property_temp_decl = objc_create_temporary_var (TREE_TYPE (property), "__objc_property_temp"); |
| DECL_SOURCE_LOCATION (objc_property_temp_decl) = location; |
| objc_property_temp_decl = lang_hooks.decls.pushdecl (objc_property_temp_decl); |
| |
| /* sizeof (ivar type). Since the ivar and the property have |
| the same type, there is no need to lookup the ivar. */ |
| size_of = c_sizeof_or_alignof_type (location, TREE_TYPE (property), |
| true /* is_sizeof */, |
| false /* min_alignof */, |
| false /* complain */); |
| |
| if (PROPERTY_NONATOMIC (property)) |
| is_atomic = boolean_false_node; |
| else |
| is_atomic = boolean_true_node; |
| |
| if (objc_copyStruct_decl) |
| function_decl = objc_copyStruct_decl; |
| else |
| function_decl = objc_getPropertyStruct_decl; |
| |
| function_call = build_function_call |
| (location, |
| /* Function prototype. */ |
| function_decl, |
| /* Parameters. */ |
| tree_cons /* &__objc_property_temp_decl */ |
| /* Warning: note that using build_fold_addr_expr_loc() |
| here causes invalid code to be generated. */ |
| (NULL_TREE, build_unary_op (location, ADDR_EXPR, objc_property_temp_decl, 0), |
| tree_cons /* &(self->PROPERTY_IVAR_NAME); */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, |
| objc_lookup_ivar |
| (NULL_TREE, PROPERTY_IVAR_NAME (property))), |
| tree_cons /* sizeof (PROPERTY_IVAR) */ |
| (NULL_TREE, size_of, |
| tree_cons /* is_atomic */ |
| (NULL_TREE, is_atomic, |
| /* TODO: This is currently ignored by the GNU |
| runtime, but what about the next one ? */ |
| tree_cons /* has_strong */ |
| (NULL_TREE, boolean_true_node, NULL_TREE)))))); |
| |
| add_stmt (function_call); |
| |
| ret_val = objc_property_temp_decl; |
| } |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| gcc_assert (ret_val); |
| |
| #ifdef OBJCPLUS |
| finish_return_stmt (ret_val); |
| #else |
| c_finish_return (location, ret_val, NULL_TREE); |
| #endif |
| |
| add_stmt (c_end_compound_stmt (location, body, true)); |
| fn = current_function_decl; |
| #ifdef OBJCPLUS |
| finish_function (); |
| #endif |
| objc_finish_method_definition (fn); |
| } |
| |
| /* This routine synthesizes a 'setter' method. */ |
| |
| static void |
| objc_synthesize_setter (tree klass, tree class_methods ATTRIBUTE_UNUSED, tree property) |
| { |
| location_t location = DECL_SOURCE_LOCATION (property); |
| tree fn, decl; |
| tree body; |
| tree new_value, statement; |
| |
| /* If user has implemented a setter with same name then do nothing. */ |
| if (lookup_method (CLASS_NST_METHODS (objc_implementation_context), |
| PROPERTY_SETTER_NAME (property))) |
| return; |
| |
| /* Find declaration of the property setter in the interface (or |
| superclass, or protocol). There must be one. */ |
| decl = lookup_method_static (klass, PROPERTY_SETTER_NAME (property), 0); |
| |
| /* If one not declared in the interface, this condition has already |
| been reported as user error (because property was not declared in |
| the interface). */ |
| if (!decl) |
| return; |
| |
| /* Adapt the 'decl'. Use the source location of the @synthesize |
| statement for error messages. */ |
| decl = copy_node (decl); |
| DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (property); |
| |
| objc_start_method_definition (false /* is_class_method */, decl, NULL_TREE, |
| NULL_TREE); |
| |
| body = c_begin_compound_stmt (true); |
| |
| /* The 'new_value' is the only argument to the method, which is the |
| 3rd argument of the function, after self and _cmd. We use twice |
| TREE_CHAIN to move forward two arguments. */ |
| new_value = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (current_function_decl))); |
| |
| /* This would presumably happen if the user has specified a |
| prototype for the setter that does not have an argument! */ |
| if (new_value == NULL_TREE) |
| { |
| /* TODO: This should be caught much earlier than this. */ |
| error_at (DECL_SOURCE_LOCATION (decl), "invalid setter, it must have one argument"); |
| /* Try to recover somehow. */ |
| new_value = error_mark_node; |
| } |
| |
| /* Now we need to decide how we build the setter. There are three |
| cases: |
| |
| for 'copy' or 'retain' properties we need to use the |
| objc_setProperty() accessor helper which knows about retain and |
| copy. It supports both 'nonatomic' and 'atomic' access. |
| |
| for 'nonatomic, assign' properties we can access the instance |
| variable directly. 'nonatomic' means we don't have to use locks, |
| and 'assign' means we don't have to worry about retain or copy. |
| If you combine the two, it means we can just access the instance |
| variable directly. |
| |
| for 'atomic, assign' properties we use objc_copyStruct() (for the |
| next runtime) or objc_setPropertyStruct() (for the GNU runtime). */ |
| switch (PROPERTY_ASSIGN_SEMANTICS (property)) |
| { |
| case OBJC_PROPERTY_RETAIN: |
| case OBJC_PROPERTY_COPY: |
| { |
| /* We build "objc_setProperty (self, _cmd, new_value, offset, is_atomic, should_copy);" */ |
| tree cmd, ivar, offset, is_atomic, should_copy; |
| cmd = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl)); |
| |
| /* Find the ivar to compute the offset. */ |
| ivar = lookup_ivar (klass, PROPERTY_IVAR_NAME (property)); |
| if (!ivar || is_private (ivar)) |
| { |
| error_at (location, |
| "cannot find instance variable associated with property"); |
| statement = error_mark_node; |
| break; |
| } |
| offset = byte_position (ivar); |
| |
| if (PROPERTY_NONATOMIC (property)) |
| is_atomic = boolean_false_node; |
| else |
| is_atomic = boolean_true_node; |
| |
| if (PROPERTY_ASSIGN_SEMANTICS (property) == OBJC_PROPERTY_COPY) |
| should_copy = boolean_true_node; |
| else |
| should_copy = boolean_false_node; |
| |
| statement = build_function_call |
| (location, |
| /* Function prototype. */ |
| objc_setProperty_decl, |
| /* Parameters. */ |
| tree_cons /* self */ |
| (NULL_TREE, self_decl, |
| tree_cons /* _cmd */ |
| (NULL_TREE, cmd, |
| tree_cons /* offset */ |
| (NULL_TREE, offset, |
| tree_cons /* new_value */ |
| (NULL_TREE, new_value, |
| tree_cons /* is_atomic */ |
| (NULL_TREE, is_atomic, |
| tree_cons /* should_copy */ |
| (NULL_TREE, should_copy, NULL_TREE))))))); |
| } |
| break; |
| case OBJC_PROPERTY_ASSIGN: |
| if (PROPERTY_NONATOMIC (property)) |
| { |
| /* We build "self->PROPERTY_IVAR_NAME = new_value;" */ |
| statement = build_modify_expr |
| (location, |
| objc_lookup_ivar (NULL_TREE, PROPERTY_IVAR_NAME (property)), |
| NULL_TREE, NOP_EXPR, |
| location, new_value, NULL_TREE); |
| break; |
| } |
| else |
| { |
| /* We build |
| objc_setPropertyStruct (&(self->PROPERTY_IVAR_NAME), |
| &new_value, |
| sizeof (type of self->PROPERTY_IVAR_NAME), |
| is_atomic, |
| false) |
| |
| For the NeXT runtime, we need to use objc_copyStruct |
| instead of objc_getPropertyStruct. */ |
| tree function_decl, size_of, is_atomic; |
| |
| /* sizeof (ivar type). Since the ivar and the property have |
| the same type, there is no need to lookup the ivar. */ |
| size_of = c_sizeof_or_alignof_type (location, TREE_TYPE (property), |
| true /* is_sizeof */, |
| false /* min_alignof */, |
| false /* complain */); |
| |
| if (PROPERTY_NONATOMIC (property)) |
| is_atomic = boolean_false_node; |
| else |
| is_atomic = boolean_true_node; |
| |
| if (objc_copyStruct_decl) |
| function_decl = objc_copyStruct_decl; |
| else |
| function_decl = objc_setPropertyStruct_decl; |
| |
| statement = build_function_call |
| (location, |
| /* Function prototype. */ |
| function_decl, |
| /* Parameters. */ |
| tree_cons /* &(self->PROPERTY_IVAR_NAME); */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, |
| objc_lookup_ivar |
| (NULL_TREE, PROPERTY_IVAR_NAME (property))), |
| tree_cons /* &new_value */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, new_value), |
| tree_cons /* sizeof (PROPERTY_IVAR) */ |
| (NULL_TREE, size_of, |
| tree_cons /* is_atomic */ |
| (NULL_TREE, is_atomic, |
| /* TODO: This is currently ignored by the GNU |
| runtime, but what about the next one ? */ |
| tree_cons /* has_strong */ |
| (NULL_TREE, boolean_true_node, NULL_TREE)))))); |
| } |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| gcc_assert (statement); |
| |
| add_stmt (statement); |
| add_stmt (c_end_compound_stmt (location, body, true)); |
| fn = current_function_decl; |
| #ifdef OBJCPLUS |
| finish_function (); |
| #endif |
| objc_finish_method_definition (fn); |
| } |
| |
| /* This function is a sub-routine of objc_add_synthesize_declaration. |
| It is called for each property to synthesize once we have |
| determined that the context is Ok. */ |
| static void |
| objc_add_synthesize_declaration_for_property (location_t location, tree interface, |
| tree property_name, tree ivar_name) |
| { |
| /* Find the @property declaration. */ |
| tree property; |
| tree x; |
| |
| /* Check that synthesize or dynamic has not already been used for |
| the same property. */ |
| for (property = IMPL_PROPERTY_DECL (objc_implementation_context); property; property = TREE_CHAIN (property)) |
| if (PROPERTY_NAME (property) == property_name) |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (property); |
| |
| if (PROPERTY_DYNAMIC (property)) |
| error_at (location, "property %qs already specified in %<@dynamic%>", |
| IDENTIFIER_POINTER (property_name)); |
| else |
| error_at (location, "property %qs already specified in %<@synthesize%>", |
| IDENTIFIER_POINTER (property_name)); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| /* Check that the property is declared in the interface. It could |
| also be declared in a superclass or protocol. */ |
| property = lookup_property (interface, property_name); |
| |
| if (!property) |
| { |
| error_at (location, "no declaration of property %qs found in the interface", |
| IDENTIFIER_POINTER (property_name)); |
| return; |
| } |
| else |
| { |
| /* We have to copy the property, because we want to chain it to |
| the implementation context, and we want to store the source |
| location of the @synthesize, not of the original |
| @property. */ |
| property = copy_node (property); |
| DECL_SOURCE_LOCATION (property) = location; |
| } |
| |
| /* Determine PROPERTY_IVAR_NAME. */ |
| if (ivar_name == NULL_TREE) |
| ivar_name = property_name; |
| |
| /* Check that the instance variable exists. You can only use an |
| instance variable from the same class, not one from the |
| superclass (this makes sense as it allows us to check that an |
| instance variable is only used in one synthesized property). */ |
| { |
| tree ivar = is_ivar (CLASS_IVARS (interface), ivar_name); |
| tree type_of_ivar; |
| if (!ivar) |
| { |
| error_at (location, "ivar %qs used by %<@synthesize%> declaration must be an existing ivar", |
| IDENTIFIER_POINTER (property_name)); |
| return; |
| } |
| |
| if (DECL_BIT_FIELD_TYPE (ivar)) |
| type_of_ivar = DECL_BIT_FIELD_TYPE (ivar); |
| else |
| type_of_ivar = TREE_TYPE (ivar); |
| |
| /* If the instance variable has a different C type, we throw an error ... */ |
| if (!comptypes (TREE_TYPE (property), type_of_ivar) |
| /* ... unless the property is readonly, in which case we allow |
| the instance variable to be more specialized (this means we |
| can generate the getter all right and it works). */ |
| && (!PROPERTY_READONLY (property) |
| || !objc_compare_types (TREE_TYPE (property), |
| type_of_ivar, -5, NULL_TREE))) |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (ivar); |
| |
| error_at (location, "property %qs is using instance variable %qs of incompatible type", |
| IDENTIFIER_POINTER (property_name), |
| IDENTIFIER_POINTER (ivar_name)); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| } |
| |
| /* If the instance variable is a bitfield, the property must be |
| 'assign', 'nonatomic' because the runtime getter/setter helper |
| do not work with bitfield instance variables. */ |
| if (DECL_BIT_FIELD_TYPE (ivar)) |
| { |
| /* If there is an error, we return and not generate any |
| getter/setter because trying to set up the runtime |
| getter/setter helper calls with bitfields is at high risk |
| of ICE. */ |
| |
| if (PROPERTY_ASSIGN_SEMANTICS (property) != OBJC_PROPERTY_ASSIGN) |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (ivar); |
| |
| error_at (location, "%<assign%> property %qs is using bit-field " |
| "instance variable %qs", |
| IDENTIFIER_POINTER (property_name), |
| IDENTIFIER_POINTER (ivar_name)); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| if (!PROPERTY_NONATOMIC (property)) |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (ivar); |
| |
| error_at (location, "%<atomic%> property %qs is using bit-field " |
| "instance variable %qs", |
| IDENTIFIER_POINTER (property_name), |
| IDENTIFIER_POINTER (ivar_name)); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| } |
| } |
| |
| /* Check that no other property is using the same instance |
| variable. */ |
| for (x = IMPL_PROPERTY_DECL (objc_implementation_context); x; x = TREE_CHAIN (x)) |
| if (PROPERTY_IVAR_NAME (x) == ivar_name) |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (x); |
| |
| error_at (location, "property %qs is using the same instance variable as property %qs", |
| IDENTIFIER_POINTER (property_name), |
| IDENTIFIER_POINTER (PROPERTY_NAME (x))); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| |
| /* We keep going on. This won't cause the compiler to fail; |
| the failure would most likely be at runtime. */ |
| } |
| |
| /* Note that a @synthesize (and only a @synthesize) always sets |
| PROPERTY_IVAR_NAME to a non-NULL_TREE. You can recognize a |
| @synthesize by that. */ |
| PROPERTY_IVAR_NAME (property) = ivar_name; |
| |
| /* PROPERTY_SETTER_NAME and PROPERTY_GETTER_NAME are copied from the |
| original declaration; they are always set (with the exception of |
| PROPERTY_SETTER_NAME not being set if PROPERTY_READONLY == 1). */ |
| |
| /* Add the property to the list of properties for current implementation. */ |
| TREE_CHAIN (property) = IMPL_PROPERTY_DECL (objc_implementation_context); |
| IMPL_PROPERTY_DECL (objc_implementation_context) = property; |
| |
| /* Note how we don't actually synthesize the getter/setter here; it |
| would be very natural, but we may miss the fact that the user has |
| implemented his own getter/setter later on in the @implementation |
| (in which case we shouldn't generate getter/setter). We wait |
| until we have parsed it all before generating the code. */ |
| } |
| |
| /* This function is called by the parser after a @synthesize |
| expression is parsed. 'location' is the location of the |
| @synthesize expression, and 'property_and_ivar_list' is a chained |
| list of the property and ivar names. */ |
| void |
| objc_add_synthesize_declaration (location_t location, tree property_and_ivar_list) |
| { |
| tree interface, chain; |
| |
| if (flag_objc1_only) |
| error_at (input_location, "%<@synthesize%> is not available in Objective-C 1.0"); |
| |
| if (property_and_ivar_list == error_mark_node) |
| return; |
| |
| if (!objc_implementation_context) |
| { |
| /* We can get here only in Objective-C; the Objective-C++ parser |
| detects the problem while parsing, outputs the error |
| "misplaced '@synthesize' Objective-C++ construct" and skips |
| the declaration. */ |
| error_at (location, "%<@synthesize%> not in @implementation context"); |
| return; |
| } |
| |
| if (TREE_CODE (objc_implementation_context) == CATEGORY_IMPLEMENTATION_TYPE) |
| { |
| error_at (location, "%<@synthesize%> cannot be used in categories"); |
| return; |
| } |
| |
| interface = lookup_interface (CLASS_NAME (objc_implementation_context)); |
| if (!interface) |
| { |
| /* I can't see how this could happen, but it is good as a safety check. */ |
| error_at (location, |
| "%<@synthesize%> requires the @interface of the class to be available"); |
| return; |
| } |
| |
| /* Now, iterate over the properties and do each of them. */ |
| for (chain = property_and_ivar_list; chain; chain = TREE_CHAIN (chain)) |
| { |
| objc_add_synthesize_declaration_for_property (location, interface, TREE_VALUE (chain), |
| TREE_PURPOSE (chain)); |
| } |
| } |
| |
| /* This function is a sub-routine of objc_add_dynamic_declaration. It |
| is called for each property to mark as dynamic once we have |
| determined that the context is Ok. */ |
| static void |
| objc_add_dynamic_declaration_for_property (location_t location, tree interface, |
| tree property_name) |
| { |
| /* Find the @property declaration. */ |
| tree property; |
| |
| /* Check that synthesize or dynamic has not already been used for |
| the same property. */ |
| for (property = IMPL_PROPERTY_DECL (objc_implementation_context); property; property = TREE_CHAIN (property)) |
| if (PROPERTY_NAME (property) == property_name) |
| { |
| location_t original_location = DECL_SOURCE_LOCATION (property); |
| |
| if (PROPERTY_DYNAMIC (property)) |
| error_at (location, "property %qs already specified in %<@dynamic%>", |
| IDENTIFIER_POINTER (property_name)); |
| else |
| error_at (location, "property %qs already specified in %<@synthesize%>", |
| IDENTIFIER_POINTER (property_name)); |
| |
| if (original_location != UNKNOWN_LOCATION) |
| inform (original_location, "originally specified here"); |
| return; |
| } |
| |
| /* Check that the property is declared in the interface. It could |
| also be declared in a superclass or protocol. */ |
| property = lookup_property (interface, property_name); |
| |
| if (!property) |
| { |
| error_at (location, "no declaration of property %qs found in the interface", |
| IDENTIFIER_POINTER (property_name)); |
| return; |
| } |
| else |
| { |
| /* We have to copy the property, because we want to chain it to |
| the implementation context, and we want to store the source |
| location of the @synthesize, not of the original |
| @property. */ |
| property = copy_node (property); |
| DECL_SOURCE_LOCATION (property) = location; |
| } |
| |
| /* Note that a @dynamic (and only a @dynamic) always sets |
| PROPERTY_DYNAMIC to 1. You can recognize a @dynamic by that. |
| (actually, as explained above, PROPERTY_DECL generated by |
| @property and associated with a @dynamic property are also marked |
| as PROPERTY_DYNAMIC). */ |
| PROPERTY_DYNAMIC (property) = 1; |
| |
| /* Add the property to the list of properties for current implementation. */ |
| TREE_CHAIN (property) = IMPL_PROPERTY_DECL (objc_implementation_context); |
| IMPL_PROPERTY_DECL (objc_implementation_context) = property; |
| } |
| |
| /* This function is called by the parser after a @dynamic expression |
| is parsed. 'location' is the location of the @dynamic expression, |
| and 'property_list' is a chained list of all the property |
| names. */ |
| void |
| objc_add_dynamic_declaration (location_t location, tree property_list) |
| { |
| tree interface, chain; |
| |
| if (flag_objc1_only) |
| error_at (input_location, "%<@dynamic%> is not available in Objective-C 1.0"); |
| |
| if (property_list == error_mark_node) |
| return; |
| |
| if (!objc_implementation_context) |
| { |
| /* We can get here only in Objective-C; the Objective-C++ parser |
| detects the problem while parsing, outputs the error |
| "misplaced '@dynamic' Objective-C++ construct" and skips the |
| declaration. */ |
| error_at (location, "%<@dynamic%> not in @implementation context"); |
| return; |
| } |
| |
| /* @dynamic is allowed in categories. */ |
| switch (TREE_CODE (objc_implementation_context)) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| interface = lookup_interface (CLASS_NAME (objc_implementation_context)); |
| break; |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| interface = lookup_category (implementation_template, |
| CLASS_SUPER_NAME (objc_implementation_context)); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| |
| if (!interface) |
| { |
| /* I can't see how this could happen, but it is good as a safety check. */ |
| error_at (location, |
| "%<@dynamic%> requires the @interface of the class to be available"); |
| return; |
| } |
| |
| /* Now, iterate over the properties and do each of them. */ |
| for (chain = property_list; chain; chain = TREE_CHAIN (chain)) |
| { |
| objc_add_dynamic_declaration_for_property (location, interface, TREE_VALUE (chain)); |
| } |
| } |
| |
| /* Main routine to generate code/data for all the property information for |
| current implementation (class or category). CLASS is the interface where |
| ivars are declared. CLASS_METHODS is where methods are found which |
| could be a class or a category depending on whether we are implementing |
| property of a class or a category. */ |
| |
| static void |
| objc_gen_property_data (tree klass, tree class_methods) |
| { |
| tree x; |
| |
| for (x = IMPL_PROPERTY_DECL (objc_implementation_context); x; x = TREE_CHAIN (x)) |
| { |
| /* @dynamic property - nothing to check or synthesize. */ |
| if (PROPERTY_DYNAMIC (x)) |
| continue; |
| |
| /* @synthesize property - need to synthesize the accessors. */ |
| if (PROPERTY_IVAR_NAME (x)) |
| { |
| objc_synthesize_getter (klass, class_methods, x); |
| |
| if (PROPERTY_READONLY (x) == 0) |
| objc_synthesize_setter (klass, class_methods, x); |
| |
| continue; |
| } |
| |
| gcc_unreachable (); |
| } |
| } |
| |
| /* This is called once we see the "@end" in an interface/implementation. */ |
| |
| static void |
| finish_class (tree klass) |
| { |
| switch (TREE_CODE (klass)) |
| { |
| case CLASS_IMPLEMENTATION_TYPE: |
| { |
| /* All metadata generation is done in runtime.generate_metadata(). */ |
| |
| /* Generate what needed for property; setters, getters, etc. */ |
| objc_gen_property_data (implementation_template, implementation_template); |
| |
| if (implementation_template != objc_implementation_context) |
| { |
| /* Ensure that all method listed in the interface contain bodies. */ |
| check_methods (CLASS_CLS_METHODS (implementation_template), |
| objc_implementation_context, '+'); |
| check_methods (CLASS_NST_METHODS (implementation_template), |
| objc_implementation_context, '-'); |
| |
| if (CLASS_PROTOCOL_LIST (implementation_template)) |
| check_protocols (CLASS_PROTOCOL_LIST (implementation_template), |
| "class", |
| CLASS_NAME (objc_implementation_context)); |
| } |
| break; |
| } |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| { |
| tree category = lookup_category (implementation_template, CLASS_SUPER_NAME (klass)); |
| |
| if (category) |
| { |
| /* Generate what needed for property; setters, getters, etc. */ |
| objc_gen_property_data (implementation_template, category); |
| |
| /* Ensure all method listed in the interface contain bodies. */ |
| check_methods (CLASS_CLS_METHODS (category), |
| objc_implementation_context, '+'); |
| check_methods (CLASS_NST_METHODS (category), |
| objc_implementation_context, '-'); |
| |
| if (CLASS_PROTOCOL_LIST (category)) |
| check_protocols (CLASS_PROTOCOL_LIST (category), |
| "category", |
| CLASS_SUPER_NAME (objc_implementation_context)); |
| } |
| break; |
| } |
| case CLASS_INTERFACE_TYPE: |
| case CATEGORY_INTERFACE_TYPE: |
| case PROTOCOL_INTERFACE_TYPE: |
| { |
| /* Process properties of the class. */ |
| tree x; |
| for (x = CLASS_PROPERTY_DECL (objc_interface_context); x; x = TREE_CHAIN (x)) |
| { |
| /* Now we check that the appropriate getter is declared, |
| and if not, we declare one ourselves. */ |
| tree getter_decl = lookup_method (CLASS_NST_METHODS (klass), |
| PROPERTY_GETTER_NAME (x)); |
| |
| if (getter_decl) |
| { |
| /* TODO: Check that the declaration is consistent with the property. */ |
| ; |
| } |
| else |
| { |
| /* Generate an instance method declaration for the |
| getter; for example "- (id) name;". In general it |
| will be of the form |
| -(type)property_getter_name; */ |
| tree rettype = build_tree_list (NULL_TREE, TREE_TYPE (x)); |
| getter_decl = build_method_decl (INSTANCE_METHOD_DECL, |
| rettype, PROPERTY_GETTER_NAME (x), |
| NULL_TREE, false); |
| if (PROPERTY_OPTIONAL (x)) |
| objc_add_method (objc_interface_context, getter_decl, false, true); |
| else |
| objc_add_method (objc_interface_context, getter_decl, false, false); |
| TREE_DEPRECATED (getter_decl) = TREE_DEPRECATED (x); |
| TREE_UNAVAILABLE (getter_decl) = TREE_UNAVAILABLE (x); |
| METHOD_PROPERTY_CONTEXT (getter_decl) = x; |
| } |
| |
| if (PROPERTY_READONLY (x) == 0) |
| { |
| /* Now we check that the appropriate setter is declared, |
| and if not, we declare on ourselves. */ |
| tree setter_decl = lookup_method (CLASS_NST_METHODS (klass), |
| PROPERTY_SETTER_NAME (x)); |
| |
| if (setter_decl) |
| { |
| /* TODO: Check that the declaration is consistent with the property. */ |
| ; |
| } |
| else |
| { |
| /* The setter name is something like 'setName:'. |
| We need the substring 'setName' to build the |
| method declaration due to how the declaration |
| works. TODO: build_method_decl() will then |
| generate back 'setName:' from 'setName'; it |
| would be more efficient to hook into there. */ |
| const char *full_setter_name = IDENTIFIER_POINTER (PROPERTY_SETTER_NAME (x)); |
| size_t length = strlen (full_setter_name); |
| char *setter_name = (char *) alloca (length); |
| tree ret_type, selector, arg_type, arg_name; |
| |
| memcpy (setter_name, full_setter_name, length - 1); |
| setter_name[length - 1] = '\0'; |
| ret_type = build_tree_list (NULL_TREE, void_type_node); |
| arg_type = build_tree_list (NULL_TREE, TREE_TYPE (x)); |
| arg_name = get_identifier ("_value"); |
| selector = objc_build_keyword_decl (get_identifier (setter_name), |
| arg_type, arg_name, NULL); |
| setter_decl = build_method_decl (INSTANCE_METHOD_DECL, |
| ret_type, selector, |
| build_tree_list (NULL_TREE, NULL_TREE), |
| false); |
| if (PROPERTY_OPTIONAL (x)) |
| objc_add_method (objc_interface_context, setter_decl, false, true); |
| else |
| objc_add_method (objc_interface_context, setter_decl, false, false); |
| TREE_DEPRECATED (setter_decl) = TREE_DEPRECATED (x); |
| TREE_UNAVAILABLE (setter_decl) = TREE_UNAVAILABLE (x); |
| METHOD_PROPERTY_CONTEXT (setter_decl) = x; |
| } |
| } |
| } |
| break; |
| } |
| default: |
| gcc_unreachable (); |
| break; |
| } |
| } |
| |
| static tree |
| add_protocol (tree protocol) |
| { |
| /* Put protocol on list in reverse order. */ |
| TREE_CHAIN (protocol) = protocol_chain; |
| protocol_chain = protocol; |
| return protocol_chain; |
| } |
| |
| /* Check that a protocol is defined, and, recursively, that all |
| protocols that this protocol conforms to are defined too. */ |
| static void |
| check_that_protocol_is_defined (tree protocol) |
| { |
| if (!PROTOCOL_DEFINED (protocol)) |
| warning (0, "definition of protocol %qE not found", |
| PROTOCOL_NAME (protocol)); |
| |
| /* If the protocol itself conforms to other protocols, check them |
| too, recursively. */ |
| if (PROTOCOL_LIST (protocol)) |
| { |
| tree p; |
| |
| for (p = PROTOCOL_LIST (protocol); p; p = TREE_CHAIN (p)) |
| check_that_protocol_is_defined (TREE_VALUE (p)); |
| } |
| } |
| |
| /* Looks up a protocol. If 'warn_if_deprecated' is true, a warning is |
| emitted if the protocol is deprecated. If 'definition_required' is |
| true, a warning is emitted if a full @protocol definition has not |
| been seen. */ |
| static tree |
| lookup_protocol (tree ident, bool warn_if_deprecated, bool definition_required) |
| { |
| tree chain; |
| |
| for (chain = protocol_chain; chain; chain = TREE_CHAIN (chain)) |
| if (ident == PROTOCOL_NAME (chain)) |
| { |
| if (TREE_UNAVAILABLE (chain)) |
| error ("protocol %qE is unavailable", PROTOCOL_NAME (chain)); |
| else if (warn_if_deprecated && TREE_DEPRECATED (chain)) |
| { |
| /* It would be nice to use warn_deprecated_use() here, but |
| we are using TREE_CHAIN (which is supposed to be the |
| TYPE_STUB_DECL for a TYPE) for something different. */ |
| warning (OPT_Wdeprecated_declarations, "protocol %qE is deprecated", |
| PROTOCOL_NAME (chain)); |
| } |
| |
| if (definition_required) |
| check_that_protocol_is_defined (chain); |
| |
| return chain; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* This function forward declares the protocols named by NAMES. If |
| they are already declared or defined, the function has no effect. */ |
| |
| void |
| objc_declare_protocol (tree name, tree attributes) |
| { |
| bool deprecated = false; |
| bool unavailable = false; |
| |
| #ifdef OBJCPLUS |
| if (current_namespace != global_namespace) { |
| error ("Objective-C declarations may only appear in global scope"); |
| } |
| #endif /* OBJCPLUS */ |
| |
| /* Determine if 'deprecated', the only attribute we recognize for |
| protocols, was used. Ignore all other attributes. */ |
| if (attributes) |
| { |
| tree attribute; |
| for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) |
| { |
| tree name = TREE_PURPOSE (attribute); |
| |
| if (is_attribute_p ("deprecated", name)) |
| deprecated = true; |
| else if (is_attribute_p ("unavailable", name)) |
| unavailable = true; |
| else |
| warning (OPT_Wattributes, "%qE attribute directive ignored", name); |
| } |
| } |
| |
| if (lookup_protocol (name, /* warn if deprecated */ false, |
| /* definition_required */ false) == NULL_TREE) |
| { |
| tree protocol = make_node (PROTOCOL_INTERFACE_TYPE); |
| |
| TYPE_LANG_SLOT_1 (protocol) |
| = make_tree_vec (PROTOCOL_LANG_SLOT_ELTS); |
| PROTOCOL_NAME (protocol) = name; |
| PROTOCOL_LIST (protocol) = NULL_TREE; |
| add_protocol (protocol); |
| PROTOCOL_DEFINED (protocol) = 0; |
| PROTOCOL_FORWARD_DECL (protocol) = NULL_TREE; |
| |
| if (attributes) |
| { |
| /* TODO: Do we need to store the attributes here ? */ |
| TYPE_ATTRIBUTES (protocol) = attributes; |
| if (deprecated) |
| TREE_DEPRECATED (protocol) = 1; |
| if (unavailable) |
| TREE_UNAVAILABLE (protocol) = 1; |
| } |
| } |
| } |
| |
| static tree |
| start_protocol (enum tree_code code, tree name, tree list, tree attributes) |
| { |
| tree protocol; |
| bool deprecated = false; |
| bool unavailable = false; |
| |
| #ifdef OBJCPLUS |
| if (current_namespace != global_namespace) { |
| error ("Objective-C declarations may only appear in global scope"); |
| } |
| #endif /* OBJCPLUS */ |
| |
| /* Determine if 'deprecated', the only attribute we recognize for |
| protocols, was used. Ignore all other attributes. */ |
| if (attributes) |
| { |
| tree attribute; |
| for (attribute = attributes; attribute; attribute = TREE_CHAIN (attribute)) |
| { |
| tree name = TREE_PURPOSE (attribute); |
| |
| if (is_attribute_p ("deprecated", name)) |
| deprecated = true; |
| else if (is_attribute_p ("unavailable", name)) |
| unavailable = true; |
| else |
| warning (OPT_Wattributes, "%qE attribute directive ignored", name); |
| } |
| } |
| |
| protocol = lookup_protocol (name, /* warn_if_deprecated */ false, |
| /* definition_required */ false); |
| |
| if (!protocol) |
| { |
| protocol = make_node (code); |
| TYPE_LANG_SLOT_1 (protocol) = make_tree_vec (PROTOCOL_LANG_SLOT_ELTS); |
| |
| PROTOCOL_NAME (protocol) = name; |
| PROTOCOL_LIST (protocol) = lookup_and_install_protocols (list, /* definition_required */ false); |
| add_protocol (protocol); |
| PROTOCOL_DEFINED (protocol) = 1; |
| PROTOCOL_FORWARD_DECL (protocol) = NULL_TREE; |
| |
| check_protocol_recursively (protocol, list); |
| } |
| else if (! PROTOCOL_DEFINED (protocol)) |
| { |
| PROTOCOL_DEFINED (protocol) = 1; |
| PROTOCOL_LIST (protocol) = lookup_and_install_protocols (list, /* definition_required */ false); |
| |
| check_protocol_recursively (protocol, list); |
| } |
| else |
| { |
| warning (0, "duplicate declaration for protocol %qE", |
| name); |
| } |
| |
| if (attributes) |
| { |
| TYPE_ATTRIBUTES (protocol) = attributes; |
| if (deprecated) |
| TREE_DEPRECATED (protocol) = 1; |
| if (unavailable) |
| TREE_UNAVAILABLE (protocol) = 1; |
| } |
| |
| return protocol; |
| } |
| |
| /* Decay array and function parameters into pointers. */ |
| |
| static tree |
| objc_decay_parm_type (tree type) |
| { |
| if (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == FUNCTION_TYPE) |
| type = build_pointer_type (TREE_CODE (type) == ARRAY_TYPE |
| ? TREE_TYPE (type) |
| : type); |
| |
| return type; |
| } |
| |
| static GTY(()) tree objc_parmlist = NULL_TREE; |
| |
| /* Append PARM to a list of formal parameters of a method, making a necessary |
| array-to-pointer adjustment along the way. */ |
| |
| void |
| objc_push_parm (tree parm) |
| { |
| tree type; |
| |
| if (TREE_TYPE (parm) == error_mark_node) |
| { |
| objc_parmlist = chainon (objc_parmlist, parm); |
| return; |
| } |
| |
| /* Decay arrays and functions into pointers. */ |
| type = objc_decay_parm_type (TREE_TYPE (parm)); |
| |
| /* If the parameter type has been decayed, a new PARM_DECL needs to be |
| built as well. */ |
| if (type != TREE_TYPE (parm)) |
| parm = build_decl (input_location, PARM_DECL, DECL_NAME (parm), type); |
| |
| DECL_ARG_TYPE (parm) |
| = lang_hooks.types.type_promotes_to (TREE_TYPE (parm)); |
| |
| /* Record constancy and volatility. */ |
| c_apply_type_quals_to_decl |
| ((TYPE_READONLY (TREE_TYPE (parm)) ? TYPE_QUAL_CONST : 0) |
| | (TYPE_RESTRICT (TREE_TYPE (parm)) ? TYPE_QUAL_RESTRICT : 0) |
| | (TYPE_ATOMIC (TREE_TYPE (parm)) ? TYPE_QUAL_ATOMIC : 0) |
| | (TYPE_VOLATILE (TREE_TYPE (parm)) ? TYPE_QUAL_VOLATILE : 0), parm); |
| |
| objc_parmlist = chainon (objc_parmlist, parm); |
| } |
| |
| /* Retrieve the formal parameter list constructed via preceding calls to |
| objc_push_parm(). */ |
| |
| #ifdef OBJCPLUS |
| tree |
| objc_get_parm_info (int have_ellipsis ATTRIBUTE_UNUSED, |
| tree expr ATTRIBUTE_UNUSED) |
| { |
| tree parm_info = objc_parmlist; |
| objc_parmlist = NULL_TREE; |
| |
| return parm_info; |
| } |
| #else |
| struct c_arg_info * |
| objc_get_parm_info (int have_ellipsis, tree expr) |
| { |
| tree parm_info = objc_parmlist; |
| struct c_arg_info *arg_info; |
| /* The C front-end requires an elaborate song and dance at |
| this point. */ |
| push_scope (); |
| declare_parm_level (); |
| while (parm_info) |
| { |
| tree next = DECL_CHAIN (parm_info); |
| |
| DECL_CHAIN (parm_info) = NULL_TREE; |
| parm_info = pushdecl (parm_info); |
| finish_decl (parm_info, input_location, NULL_TREE, NULL_TREE, NULL_TREE); |
| parm_info = next; |
| } |
| arg_info = get_parm_info (have_ellipsis, expr); |
| pop_scope (); |
| objc_parmlist = NULL_TREE; |
| return arg_info; |
| } |
| #endif |
| |
| /* Synthesize the formal parameters 'id self' and 'SEL _cmd' needed for ObjC |
| method definitions. In the case of instance methods, we can be more |
| specific as to the type of 'self'. */ |
| |
| static void |
| synth_self_and_ucmd_args (void) |
| { |
| tree self_type; |
| |
| if (objc_method_context |
| && TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL) |
| self_type = objc_instance_type; |
| else |
| /* Really a `struct objc_class *'. However, we allow people to |
| assign to self, which changes its type midstream. */ |
| self_type = objc_object_type; |
| |
| /* id self; */ |
| objc_push_parm (build_decl (input_location, |
| PARM_DECL, self_id, self_type)); |
| |
| /* SEL _cmd; */ |
| objc_push_parm (build_decl (input_location, |
| PARM_DECL, ucmd_id, objc_selector_type)); |
| } |
| |
| /* Transform an Objective-C method definition into a static C function |
| definition, synthesizing the first two arguments, "self" and "_cmd", |
| in the process. EXPR is NULL or an expression that needs to be |
| evaluated for the side effects of array size expressions in the |
| parameters. */ |
| |
| static void |
| start_method_def (tree method, tree expr) |
| { |
| tree parmlist; |
| #ifdef OBJCPLUS |
| tree parm_info; |
| #else |
| struct c_arg_info *parm_info; |
| #endif |
| int have_ellipsis = 0; |
| |
| /* If we are defining a "dealloc" method in a non-root class, we |
| will need to check if a [super dealloc] is missing, and warn if |
| it is. */ |
| if(CLASS_SUPER_NAME (objc_implementation_context) |
| && !strcmp ("dealloc", IDENTIFIER_POINTER (METHOD_SEL_NAME (method)))) |
| should_call_super_dealloc = 1; |
| else |
| should_call_super_dealloc = 0; |
| |
| /* Required to implement _msgSuper. */ |
| objc_method_context = method; |
| UOBJC_SUPER_decl = NULL_TREE; |
| |
| /* Generate prototype declarations for arguments..."new-style". */ |
| synth_self_and_ucmd_args (); |
| |
| /* Generate argument declarations if a keyword_decl. */ |
| parmlist = METHOD_SEL_ARGS (method); |
| while (parmlist) |
| { |
| /* parmlist is a KEYWORD_DECL. */ |
| tree type = TREE_VALUE (TREE_TYPE (parmlist)); |
| tree parm; |
| |
| parm = build_decl (input_location, |
| PARM_DECL, KEYWORD_ARG_NAME (parmlist), type); |
| decl_attributes (&parm, DECL_ATTRIBUTES (parmlist), 0); |
| objc_push_parm (parm); |
| parmlist = DECL_CHAIN (parmlist); |
| } |
| |
| if (METHOD_ADD_ARGS (method)) |
| { |
| tree akey; |
| |
| for (akey = TREE_CHAIN (METHOD_ADD_ARGS (method)); |
| akey; akey = TREE_CHAIN (akey)) |
| { |
| objc_push_parm (TREE_VALUE (akey)); |
| } |
| |
| if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) |
| have_ellipsis = 1; |
| } |
| |
| parm_info = objc_get_parm_info (have_ellipsis, expr); |
| |
| really_start_method (objc_method_context, parm_info); |
| } |
| |
| /* Return 1 if TYPE1 is equivalent to TYPE2 for purposes of method |
| overloading. */ |
| static int |
| objc_types_are_equivalent (tree type1, tree type2) |
| { |
| if (type1 == type2) |
| return 1; |
| |
| /* Strip away indirections. */ |
| while ((TREE_CODE (type1) == ARRAY_TYPE || TREE_CODE (type1) == POINTER_TYPE) |
| && (TREE_CODE (type1) == TREE_CODE (type2))) |
| type1 = TREE_TYPE (type1), type2 = TREE_TYPE (type2); |
| if (TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2)) |
| return 0; |
| |
| /* Compare the protocol lists. */ |
| type1 = (TYPE_HAS_OBJC_INFO (type1) |
| ? TYPE_OBJC_PROTOCOL_LIST (type1) |
| : NULL_TREE); |
| type2 = (TYPE_HAS_OBJC_INFO (type2) |
| ? TYPE_OBJC_PROTOCOL_LIST (type2) |
| : NULL_TREE); |
| |
| /* If there are no protocols (most common case), the types are |
| identical. */ |
| if (type1 == NULL_TREE && type2 == NULL_TREE) |
| return 1; |
| |
| /* If one has protocols, and the other one hasn't, they are not |
| identical. */ |
| if ((type1 == NULL_TREE && type2 != NULL_TREE) |
| || (type1 != NULL_TREE && type2 == NULL_TREE)) |
| return 0; |
| else |
| { |
| /* Else, both have protocols, and we need to do the full |
| comparison. It is possible that either type1 or type2 |
| contain some duplicate protocols in the list, so we can't |
| even just compare list_length as a first check. */ |
| tree t; |
| |
| for (t = type2; t; t = TREE_CHAIN (t)) |
| if (!lookup_protocol_in_reflist (type1, TREE_VALUE (t))) |
| return 0; |
| |
| for (t = type1; t; t = TREE_CHAIN (t)) |
| if (!lookup_protocol_in_reflist (type2, TREE_VALUE (t))) |
| return 0; |
| |
| return 1; |
| } |
| } |
| |
| /* Return 1 if TYPE1 has the same size and alignment as TYPE2. */ |
| |
| static int |
| objc_types_share_size_and_alignment (tree type1, tree type2) |
| { |
| return (simple_cst_equal (TYPE_SIZE (type1), TYPE_SIZE (type2)) |
| && TYPE_ALIGN (type1) == TYPE_ALIGN (type2)); |
| } |
| |
| /* Return 1 if PROTO1 is equivalent to PROTO2 |
| for purposes of method overloading. Ordinarily, the type signatures |
| should match up exactly, unless STRICT is zero, in which case we |
| shall allow differences in which the size and alignment of a type |
| is the same. */ |
| |
| static int |
| comp_proto_with_proto (tree proto1, tree proto2, int strict) |
| { |
| tree type1, type2; |
| |
| /* The following test is needed in case there are hashing |
| collisions. */ |
| if (METHOD_SEL_NAME (proto1) != METHOD_SEL_NAME (proto2)) |
| return 0; |
| |
| /* Compare return types. */ |
| type1 = TREE_VALUE (TREE_TYPE (proto1)); |
| type2 = TREE_VALUE (TREE_TYPE (proto2)); |
| |
| if (!objc_types_are_equivalent (type1, type2) |
| && (strict || !objc_types_share_size_and_alignment (type1, type2))) |
| return 0; |
| |
| /* Compare argument types. */ |
| |
| /* The first argument (objc_object_type) is always the same, no need |
| to compare. */ |
| |
| /* The second argument (objc_selector_type) is always the same, no |
| need to compare. */ |
| |
| /* Compare the other arguments. */ |
| { |
| tree arg1, arg2; |
| |
| /* Compare METHOD_SEL_ARGS. */ |
| for (arg1 = METHOD_SEL_ARGS (proto1), arg2 = METHOD_SEL_ARGS (proto2); |
| arg1 && arg2; |
| arg1 = DECL_CHAIN (arg1), arg2 = DECL_CHAIN (arg2)) |
| { |
| type1 = TREE_VALUE (TREE_TYPE (arg1)); |
| type2 = TREE_VALUE (TREE_TYPE (arg2)); |
| |
| /* FIXME: Do we need to decay argument types to compare them ? */ |
| type1 = objc_decay_parm_type (type1); |
| type2 = objc_decay_parm_type (type2); |
| |
| if (!objc_types_are_equivalent (type1, type2) |
| && (strict || !objc_types_share_size_and_alignment (type1, type2))) |
| return 0; |
| } |
| |
| /* The loop ends when arg1 or arg2 are NULL. Make sure they are |
| both NULL. */ |
| if (arg1 != arg2) |
| return 0; |
| |
| /* Compare METHOD_ADD_ARGS. */ |
| if ((METHOD_ADD_ARGS (proto1) && !METHOD_ADD_ARGS (proto2)) |
| || (METHOD_ADD_ARGS (proto2) && !METHOD_ADD_ARGS (proto1))) |
| return 0; |
| |
| if (METHOD_ADD_ARGS (proto1)) |
| { |
| for (arg1 = TREE_CHAIN (METHOD_ADD_ARGS (proto1)), arg2 = TREE_CHAIN (METHOD_ADD_ARGS (proto2)); |
| arg1 && arg2; |
| arg1 = TREE_CHAIN (arg1), arg2 = TREE_CHAIN (arg2)) |
| { |
| type1 = TREE_TYPE (TREE_VALUE (arg1)); |
| type2 = TREE_TYPE (TREE_VALUE (arg2)); |
| |
| /* FIXME: Do we need to decay argument types to compare them ? */ |
| type1 = objc_decay_parm_type (type1); |
| type2 = objc_decay_parm_type (type2); |
| |
| if (!objc_types_are_equivalent (type1, type2) |
| && (strict || !objc_types_share_size_and_alignment (type1, type2))) |
| return 0; |
| } |
| } |
| |
| /* The loop ends when arg1 or arg2 are NULL. Make sure they are |
| both NULL. */ |
| if (arg1 != arg2) |
| return 0; |
| |
| /* Compare METHOD_ADD_ARGS_ELLIPSIS_P. */ |
| if (METHOD_ADD_ARGS_ELLIPSIS_P (proto1) != METHOD_ADD_ARGS_ELLIPSIS_P (proto2)) |
| return 0; |
| } |
| |
| /* Success. */ |
| return 1; |
| } |
| |
| /* This routine returns true if TYPE is a valid objc object type, |
| suitable for messaging; false otherwise. If 'accept_class' is |
| 'true', then a Class object is considered valid for messaging and |
| 'true' is returned if 'type' refers to a Class. If 'accept_class' |
| is 'false', then a Class object is not considered valid for |
| messaging and 'false' is returned in that case. */ |
| |
| static bool |
| objc_type_valid_for_messaging (tree type, bool accept_classes) |
| { |
| if (!POINTER_TYPE_P (type)) |
| return false; |
| |
| /* We will check for an NSObject type attribute on the pointer if other |
| tests fail. */ |
| tree type_attr = TYPE_ATTRIBUTES (type); |
| |
| /* Remove the pointer indirection; don't remove more than one |
| otherwise we'd consider "NSObject **" a valid type for messaging, |
| which it isn't. */ |
| type = TREE_TYPE (type); |
| |
| /* We allow void * to have an NSObject type attr. */ |
| if (VOID_TYPE_P (type) && type_attr) |
| return lookup_attribute ("NSObject", type_attr) != NULL_TREE; |
| |
| if (TREE_CODE (type) != RECORD_TYPE) |
| return false; |
| |
| if (objc_is_object_id (type)) |
| return true; |
| |
| if (objc_is_class_id (type)) |
| return accept_classes; |
| |
| if (TYPE_HAS_OBJC_INFO (type)) |
| return true; |
| |
| if (type_attr) |
| return lookup_attribute ("NSObject", type_attr) != NULL_TREE; |
| |
| return false; |
| } |
| |
| void |
| objc_start_function (tree name, tree type, tree attrs, |
| #ifdef OBJCPLUS |
| tree params |
| #else |
| struct c_arg_info *params |
| #endif |
| ) |
| { |
| tree fndecl = build_decl (input_location, |
| FUNCTION_DECL, name, type); |
| |
| #ifdef OBJCPLUS |
| DECL_ARGUMENTS (fndecl) = params; |
| DECL_INITIAL (fndecl) = error_mark_node; |
| DECL_EXTERNAL (fndecl) = 0; |
| TREE_STATIC (fndecl) = 1; |
| retrofit_lang_decl (fndecl); |
| cplus_decl_attributes (&fndecl, attrs, 0); |
| start_preparsed_function (fndecl, attrs, /*flags=*/SF_DEFAULT); |
| #else |
| current_function_returns_value = 0; /* Assume, until we see it does. */ |
| current_function_returns_null = 0; |
| decl_attributes (&fndecl, attrs, 0); |
| announce_function (fndecl); |
| DECL_INITIAL (fndecl) = error_mark_node; |
| DECL_EXTERNAL (fndecl) = 0; |
| TREE_STATIC (fndecl) = 1; |
| current_function_decl = pushdecl (fndecl); |
| push_scope (); |
| declare_parm_level (); |
| DECL_RESULT (current_function_decl) |
| = build_decl (input_location, |
| RESULT_DECL, NULL_TREE, |
| TREE_TYPE (TREE_TYPE (current_function_decl))); |
| DECL_ARTIFICIAL (DECL_RESULT (current_function_decl)) = 1; |
| DECL_IGNORED_P (DECL_RESULT (current_function_decl)) = 1; |
| start_fname_decls (); |
| store_parm_decls_from (params); |
| #endif |
| |
| TREE_USED (current_function_decl) = 1; |
| } |
| |
| /* - Generate an identifier for the function. the format is "_n_cls", |
| where 1 <= n <= nMethods, and cls is the name the implementation we |
| are processing. |
| - Install the return type from the method declaration. |
| - If we have a prototype, check for type consistency. */ |
| |
| static void |
| really_start_method (tree method, |
| #ifdef OBJCPLUS |
| tree parmlist |
| #else |
| struct c_arg_info *parmlist |
| #endif |
| ) |
| { |
| tree ret_type, meth_type; |
| tree method_id; |
| const char *sel_name, *class_name, *cat_name; |
| char *buf; |
| |
| /* Synth the storage class & assemble the return type. */ |
| ret_type = TREE_VALUE (TREE_TYPE (method)); |
| |
| sel_name = IDENTIFIER_POINTER (METHOD_SEL_NAME (method)); |
| class_name = IDENTIFIER_POINTER (CLASS_NAME (objc_implementation_context)); |
| cat_name = ((TREE_CODE (objc_implementation_context) |
| == CLASS_IMPLEMENTATION_TYPE) |
| ? NULL |
| : IDENTIFIER_POINTER (CLASS_SUPER_NAME (objc_implementation_context))); |
| method_slot++; |
| |
| /* Make sure this is big enough for any plausible method label. */ |
| buf = (char *) alloca (50 + strlen (sel_name) + strlen (class_name) |
| + (cat_name ? strlen (cat_name) : 0)); |
| |
| OBJC_GEN_METHOD_LABEL (buf, TREE_CODE (method) == INSTANCE_METHOD_DECL, |
| class_name, cat_name, sel_name, method_slot); |
| |
| method_id = get_identifier (buf); |
| |
| #ifdef OBJCPLUS |
| /* Objective-C methods cannot be overloaded, so we don't need |
| the type encoding appended. It looks bad anyway... */ |
| push_lang_context (lang_name_c); |
| #endif |
| |
| meth_type = build_function_type_for_method (ret_type, method, METHOD_DEF, 0); |
| objc_start_function (method_id, meth_type, NULL_TREE, parmlist); |
| |
| /* Set self_decl from the first argument. */ |
| self_decl = DECL_ARGUMENTS (current_function_decl); |
| |
| /* Suppress unused warnings. */ |
| TREE_USED (self_decl) = 1; |
| DECL_READ_P (self_decl) = 1; |
| TREE_USED (DECL_CHAIN (self_decl)) = 1; |
| DECL_READ_P (DECL_CHAIN (self_decl)) = 1; |
| #ifdef OBJCPLUS |
| pop_lang_context (); |
| #endif |
| |
| METHOD_DEFINITION (method) = current_function_decl; |
| |
| /* Check consistency...start_function, pushdecl, duplicate_decls. */ |
| |
| if (implementation_template != objc_implementation_context) |
| { |
| tree proto |
| = lookup_method_static (implementation_template, |
| METHOD_SEL_NAME (method), |
| ((TREE_CODE (method) == CLASS_METHOD_DECL) |
| | OBJC_LOOKUP_NO_SUPER)); |
| |
| if (proto) |
| { |
| if (!comp_proto_with_proto (method, proto, 1)) |
| { |
| bool type = TREE_CODE (method) == INSTANCE_METHOD_DECL; |
| |
| warning_at (DECL_SOURCE_LOCATION (method), 0, |
| "conflicting types for %<%c%s%>", |
| (type ? '-' : '+'), |
| identifier_to_locale (gen_method_decl (method))); |
| inform (DECL_SOURCE_LOCATION (proto), |
| "previous declaration of %<%c%s%>", |
| (type ? '-' : '+'), |
| identifier_to_locale (gen_method_decl (proto))); |
| } |
| else |
| { |
| /* If the method in the @interface was deprecated, mark |
| the implemented method as deprecated too. It should |
| never be used for messaging (when the deprecation |
| warnings are produced), but just in case. */ |
| if (TREE_DEPRECATED (proto)) |
| TREE_DEPRECATED (method) = 1; |
| if (TREE_UNAVAILABLE (proto)) |
| TREE_UNAVAILABLE (method) = 1; |
| |
| /* If the method in the @interface was marked as |
| 'noreturn', mark the function implementing the method |
| as 'noreturn' too. */ |
| TREE_THIS_VOLATILE (current_function_decl) = TREE_THIS_VOLATILE (proto); |
| } |
| } |
| else |
| { |
| /* We have a method @implementation even though we did not |
| see a corresponding @interface declaration (which is allowed |
| by Objective-C rules). Go ahead and place the method in |
| the @interface anyway, so that message dispatch lookups |
| will see it. */ |
| tree interface = implementation_template; |
| |
| if (TREE_CODE (objc_implementation_context) |
| == CATEGORY_IMPLEMENTATION_TYPE) |
| interface = lookup_category |
| (interface, |
| CLASS_SUPER_NAME (objc_implementation_context)); |
| |
| if (interface) |
| objc_add_method (interface, copy_node (method), |
| TREE_CODE (method) == CLASS_METHOD_DECL, |
| /* is_optional= */ false); |
| } |
| } |
| } |
| |
| static void *UOBJC_SUPER_scope = 0; |
| |
| /* _n_Method (id self, SEL sel, ...) |
| { |
| struct objc_super _S; |
| _msgSuper ((_S.self = self, _S.class = _cls, &_S), ...); |
| } */ |
| |
| static tree |
| get_super_receiver (void) |
| { |
| if (objc_method_context) |
| { |
| tree super_expr, super_expr_list, class_expr; |
| bool inst_meth; |
| if (!UOBJC_SUPER_decl) |
| { |
| UOBJC_SUPER_decl = build_decl (input_location, |
| VAR_DECL, get_identifier (TAG_SUPER), |
| objc_super_template); |
| /* This prevents `unused variable' warnings when compiling with -Wall. */ |
| TREE_USED (UOBJC_SUPER_decl) = 1; |
| DECL_READ_P (UOBJC_SUPER_decl) = 1; |
| lang_hooks.decls.pushdecl (UOBJC_SUPER_decl); |
| finish_decl (UOBJC_SUPER_decl, input_location, NULL_TREE, NULL_TREE, |
| NULL_TREE); |
| UOBJC_SUPER_scope = objc_get_current_scope (); |
| } |
| |
| /* Set receiver to self. */ |
| super_expr = objc_build_component_ref (UOBJC_SUPER_decl, self_id); |
| super_expr = build_modify_expr (input_location, super_expr, NULL_TREE, |
| NOP_EXPR, input_location, self_decl, |
| NULL_TREE); |
| super_expr_list = super_expr; |
| |
| /* Set class to begin searching. */ |
| /* Get the ident for the superclass class field & build a ref to it. |
| ??? maybe we should just name the field the same for all runtimes. */ |
| super_expr = (*runtime.super_superclassfield_ident) (); |
| super_expr = objc_build_component_ref (UOBJC_SUPER_decl, super_expr); |
| |
| gcc_assert (imp_list->imp_context == objc_implementation_context |
| && imp_list->imp_template == implementation_template); |
| inst_meth = (TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL); |
| |
| if (TREE_CODE (objc_implementation_context) == CLASS_IMPLEMENTATION_TYPE) |
| class_expr = (*runtime.get_class_super_ref) (input_location, |
| imp_list, inst_meth); |
| else |
| /* We have a category. */ |
| { |
| tree super_name = CLASS_SUPER_NAME (imp_list->imp_template); |
| tree super_class; |
| |
| /* Barf if super used in a category of a root object. */ |
| if (!super_name) |
| { |
| error ("no super class declared in interface for %qE", |
| CLASS_NAME (imp_list->imp_template)); |
| return error_mark_node; |
| } |
| |
| super_class = (*runtime.get_category_super_ref) (input_location, |
| imp_list, inst_meth); |
| class_expr = build_c_cast (input_location, |
| TREE_TYPE (super_expr), super_class); |
| } |
| |
| super_expr = build_modify_expr (input_location, super_expr, NULL_TREE, |
| NOP_EXPR, |
| input_location, class_expr, NULL_TREE); |
| |
| super_expr_list = build_compound_expr (input_location, |
| super_expr_list, super_expr); |
| |
| super_expr = build_unary_op (input_location, |
| ADDR_EXPR, UOBJC_SUPER_decl, 0); |
| super_expr_list = build_compound_expr (input_location, |
| super_expr_list, super_expr); |
| |
| return super_expr_list; |
| } |
| else |
| { |
| error ("%<[super ...]%> must appear in a method context"); |
| return error_mark_node; |
| } |
| } |
| |
| /* When exiting a scope, sever links to a 'super' declaration (if any) |
| therein contained. */ |
| |
| void |
| objc_clear_super_receiver (void) |
| { |
| if (objc_method_context |
| && UOBJC_SUPER_scope == objc_get_current_scope ()) |
| { |
| UOBJC_SUPER_decl = 0; |
| UOBJC_SUPER_scope = 0; |
| } |
| } |
| |
| void |
| objc_finish_method_definition (tree fndecl) |
| { |
| /* We cannot validly inline ObjC methods, at least not without a language |
| extension to declare that a method need not be dynamically |
| dispatched, so suppress all thoughts of doing so. */ |
| DECL_UNINLINABLE (fndecl) = 1; |
| |
| #ifndef OBJCPLUS |
| /* The C++ front-end will have called finish_function() for us. */ |
| finish_function (); |
| #endif |
| |
| METHOD_ENCODING (objc_method_context) |
| = encode_method_prototype (objc_method_context); |
| |
| /* Required to implement _msgSuper. This must be done AFTER finish_function, |
| since the optimizer may find "may be used before set" errors. */ |
| objc_method_context = NULL_TREE; |
| |
| if (should_call_super_dealloc) |
| warning (0, "method possibly missing a [super dealloc] call"); |
| } |
| |
| /* Given a tree DECL node, produce a printable description of it in the given |
| buffer, overwriting the buffer. */ |
| |
| static char * |
| gen_declaration (tree decl) |
| { |
| errbuf[0] = '\0'; |
| |
| if (DECL_P (decl)) |
| { |
| gen_type_name_0 (TREE_TYPE (decl)); |
| |
| if (DECL_NAME (decl)) |
| { |
| if (!POINTER_TYPE_P (TREE_TYPE (decl))) |
| strcat (errbuf, " "); |
| |
| strcat (errbuf, IDENTIFIER_POINTER (DECL_NAME (decl))); |
| } |
| |
| #ifdef OBJCPLUS |
| tree w = DECL_BIT_FIELD_REPRESENTATIVE (decl); |
| #else |
| tree w = DECL_INITIAL (decl); |
| #endif |
| if (w) |
| { |
| STRIP_ANY_LOCATION_WRAPPER (w); |
| if (TREE_CODE (w) == INTEGER_CST) |
| sprintf (errbuf + strlen (errbuf), ": " HOST_WIDE_INT_PRINT_DEC, |
| TREE_INT_CST_LOW (w)); |
| } |
| } |
| |
| return errbuf; |
| } |
| |
| /* Given a tree TYPE node, produce a printable description of it in the given |
| buffer, overwriting the buffer. */ |
| |
| static char * |
| gen_type_name_0 (tree type) |
| { |
| tree orig = type, proto; |
| |
| if (TYPE_P (type) && TYPE_NAME (type)) |
| type = TYPE_NAME (type); |
| else if (POINTER_TYPE_P (type) || TREE_CODE (type) == ARRAY_TYPE) |
| { |
| tree inner = TREE_TYPE (type); |
| |
| while (TREE_CODE (inner) == ARRAY_TYPE) |
| inner = TREE_TYPE (inner); |
| |
| gen_type_name_0 (inner); |
| |
| if (!POINTER_TYPE_P (inner)) |
| strcat (errbuf, " "); |
| |
| if (POINTER_TYPE_P (type)) |
| strcat (errbuf, "*"); |
| else |
| while (type != inner) |
| { |
| strcat (errbuf, "["); |
| |
| if (TYPE_DOMAIN (type)) |
| { |
| char sz[20]; |
| |
| sprintf (sz, HOST_WIDE_INT_PRINT_DEC, |
| (TREE_INT_CST_LOW |
| (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) + 1)); |
| strcat (errbuf, sz); |
| } |
| |
| strcat (errbuf, "]"); |
| type = TREE_TYPE (type); |
| } |
| |
| goto exit_function; |
| } |
| |
| if (TREE_CODE (type) == TYPE_DECL && DECL_NAME (type)) |
| type = DECL_NAME (type); |
| |
| strcat (errbuf, TREE_CODE (type) == IDENTIFIER_NODE |
| ? IDENTIFIER_POINTER (type) |
| : ""); |
| |
| /* For 'id' and 'Class', adopted protocols are stored in the pointee. */ |
| if (objc_is_id (orig)) |
| orig = TREE_TYPE (orig); |
| |
| proto = TYPE_HAS_OBJC_INFO (orig) ? TYPE_OBJC_PROTOCOL_LIST (orig) : NULL_TREE; |
| |
| if (proto) |
| { |
| strcat (errbuf, " <"); |
| |
| while (proto) { |
| strcat (errbuf, |
| IDENTIFIER_POINTER (PROTOCOL_NAME (TREE_VALUE (proto)))); |
| proto = TREE_CHAIN (proto); |
| strcat (errbuf, proto ? ", " : ">"); |
| } |
| } |
| |
| exit_function: |
| return errbuf; |
| } |
| |
| static char * |
| gen_type_name (tree type) |
| { |
| errbuf[0] = '\0'; |
| |
| return gen_type_name_0 (type); |
| } |
| |
| /* Given a method tree, put a printable description into the given |
| buffer (overwriting) and return a pointer to the buffer. */ |
| |
| static char * |
| gen_method_decl (tree method) |
| { |
| tree chain; |
| |
| strcpy (errbuf, "("); /* NB: Do _not_ call strcat() here. */ |
| gen_type_name_0 (TREE_VALUE (TREE_TYPE (method))); |
| strcat (errbuf, ")"); |
| chain = METHOD_SEL_ARGS (method); |
| |
| if (chain) |
| { |
| /* We have a chain of keyword_decls. */ |
| do |
| { |
| if (KEYWORD_KEY_NAME (chain)) |
| strcat (errbuf, IDENTIFIER_POINTER (KEYWORD_KEY_NAME (chain))); |
| |
| strcat (errbuf, ":("); |
| gen_type_name_0 (TREE_VALUE (TREE_TYPE (chain))); |
| strcat (errbuf, ")"); |
| |
| strcat (errbuf, IDENTIFIER_POINTER (KEYWORD_ARG_NAME (chain))); |
| if ((chain = DECL_CHAIN (chain))) |
| strcat (errbuf, " "); |
| } |
| while (chain); |
| |
| if (METHOD_ADD_ARGS (method)) |
| { |
| chain = TREE_CHAIN (METHOD_ADD_ARGS (method)); |
| |
| /* Know we have a chain of parm_decls. */ |
| while (chain) |
| { |
| strcat (errbuf, ", "); |
| gen_type_name_0 (TREE_TYPE (TREE_VALUE (chain))); |
| chain = TREE_CHAIN (chain); |
| } |
| |
| if (METHOD_ADD_ARGS_ELLIPSIS_P (method)) |
| strcat (errbuf, ", ..."); |
| } |
| } |
| |
| else |
| /* We have a unary selector. */ |
| strcat (errbuf, IDENTIFIER_POINTER (METHOD_SEL_NAME (method))); |
| |
| return errbuf; |
| } |
| |
| /* Debug info. */ |
| |
| |
| /* Dump an @interface declaration of the supplied class CHAIN to the |
| supplied file FP. Used to implement the -gen-decls option (which |
| prints out an @interface declaration of all classes compiled in |
| this run); potentially useful for debugging the compiler too. */ |
| void |
| dump_interface (FILE *fp, tree chain) |
| { |
| /* FIXME: A heap overflow here whenever a method (or ivar) |
| declaration is so long that it doesn't fit in the buffer. The |
| code and all the related functions should be rewritten to avoid |
| using fixed size buffers. */ |
| const char *my_name = IDENTIFIER_POINTER (CLASS_NAME (chain)); |
| tree ivar_decls = CLASS_RAW_IVARS (chain); |
| tree nst_methods = CLASS_NST_METHODS (chain); |
| tree cls_methods = CLASS_CLS_METHODS (chain); |
| |
| fprintf (fp, "\n@interface %s", my_name); |
| |
| /* CLASS_SUPER_NAME is used to store the superclass name for |
| classes, and the category name for categories. */ |
| if (CLASS_SUPER_NAME (chain)) |
| { |
| const char *name = IDENTIFIER_POINTER (CLASS_SUPER_NAME (chain)); |
| |
| switch (TREE_CODE (chain)) |
| { |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| case CATEGORY_INTERFACE_TYPE: |
| fprintf (fp, " (%s)\n", name); |
| break; |
| default: |
| fprintf (fp, " : %s\n", name); |
| break; |
| } |
| } |
| else |
| fprintf (fp, "\n"); |
| |
| /* FIXME - the following doesn't seem to work at the moment. */ |
| if (ivar_decls) |
| { |
| fprintf (fp, "{\n"); |
| do |
| { |
| fprintf (fp, "\t%s;\n", gen_declaration (ivar_decls)); |
| ivar_decls = TREE_CHAIN (ivar_decls); |
| } |
| while (ivar_decls); |
| fprintf (fp, "}\n"); |
| } |
| |
| while (nst_methods) |
| { |
| fprintf (fp, "- %s;\n", gen_method_decl (nst_methods)); |
| nst_methods = TREE_CHAIN (nst_methods); |
| } |
| |
| while (cls_methods) |
| { |
| fprintf (fp, "+ %s;\n", gen_method_decl (cls_methods)); |
| cls_methods = TREE_CHAIN (cls_methods); |
| } |
| |
| fprintf (fp, "@end\n"); |
| } |
| |
| #if 0 |
| /* Produce the pretty printing for an Objective-C method. This is |
| currently unused, but could be handy while reorganizing the pretty |
| printing to be more robust. */ |
| static const char * |
| objc_pretty_print_method (bool is_class_method, |
| const char *class_name, |
| const char *category_name, |
| const char *selector) |
| { |
| if (category_name) |
| { |
| char *result = XNEWVEC (char, strlen (class_name) + strlen (category_name) |
| + strlen (selector) + 7); |
| |
| if (is_class_method) |
| sprintf (result, "+[%s(%s) %s]", class_name, category_name, selector); |
| else |
| sprintf (result, "-[%s(%s) %s]", class_name, category_name, selector); |
| |
| return result; |
| } |
| else |
| { |
| char *result = XNEWVEC (char, strlen (class_name) |
| + strlen (selector) + 5); |
| |
| if (is_class_method) |
| sprintf (result, "+[%s %s]", class_name, selector); |
| else |
| sprintf (result, "-[%s %s]", class_name, selector); |
| |
| return result; |
| } |
| } |
| #endif |
| |
| /* Demangle function for Objective-C. Attempt to demangle the |
| function name associated with a method (eg, going from |
| "_i_NSObject__class" to "-[NSObject class]"); usually for the |
| purpose of pretty printing or error messages. Return the demangled |
| name, or NULL if the string is not an Objective-C mangled method |
| name. |
| |
| Because of how the mangling is done, any method that has a '_' in |
| its original name is at risk of being demangled incorrectly. In |
| some cases there are multiple valid ways to demangle a method name |
| and there is no way we can decide. |
| |
| TODO: objc_demangle() can't always get it right; the right way to |
| get this correct for all method names would be to store the |
| Objective-C method name somewhere in the function decl. Then, |
| there is no demangling to do; we'd just pull the method name out of |
| the decl. As an additional bonus, when printing error messages we |
| could check for such a method name, and if we find it, we know the |
| function is actually an Objective-C method and we could print error |
| messages saying "In method '+[NSObject class]" instead of "In |
| function '+[NSObject class]" as we do now. */ |
| static const char * |
| objc_demangle (const char *mangled) |
| { |
| char *demangled, *cp; |
| |
| /* First of all, if the name is too short it can't be an Objective-C |
| mangled method name. */ |
| if (mangled[0] == '\0' || mangled[1] == '\0' || mangled[2] == '\0') |
| return NULL; |
| |
| /* If the name looks like an already demangled one, return it |
| unchanged. This should only happen on Darwin, where method names |
| are mangled differently into a pretty-print form (such as |
| '+[NSObject class]', see darwin.h). In that case, demangling is |
| a no-op, but we need to return the demangled name if it was an |
| ObjC one, and return NULL if not. We should be safe as no C/C++ |
| function can start with "-[" or "+[". */ |
| if ((mangled[0] == '-' || mangled[0] == '+') |
| && (mangled[1] == '[')) |
| return mangled; |
| |
| if (mangled[0] == '_' && |
| (mangled[1] == 'i' || mangled[1] == 'c') && |
| mangled[2] == '_') |
| { |
| cp = demangled = XNEWVEC (char, strlen(mangled) + 2); |
| if (mangled[1] == 'i') |
| *cp++ = '-'; /* for instance method */ |
| else |
| *cp++ = '+'; /* for class method */ |
| *cp++ = '['; /* opening left brace */ |
| strcpy(cp, mangled+3); /* tack on the rest of the mangled name */ |
| while (*cp && *cp == '_') |
| cp++; /* skip any initial underbars in class name */ |
| cp = strchr(cp, '_'); /* find first non-initial underbar */ |
| if (cp == NULL) |
| { |
| free(demangled); /* not mangled name */ |
| return NULL; |
| } |
| if (cp[1] == '_') /* easy case: no category name */ |
| { |
| *cp++ = ' '; /* replace two '_' with one ' ' */ |
| strcpy(cp, mangled + (cp - demangled) + 2); |
| } |
| else |
| { |
| *cp++ = '('; /* less easy case: category name */ |
| cp = strchr(cp, '_'); |
| if (cp == 0) |
| { |
| free(demangled); /* not mangled name */ |
| return NULL; |
| } |
| *cp++ = ')'; |
| *cp++ = ' '; /* overwriting 1st char of method name... */ |
| strcpy(cp, mangled + (cp - demangled)); /* get it back */ |
| } |
| /* Now we have the method name. We need to generally replace |
| '_' with ':' but trying to preserve '_' if it could only have |
| been in the mangled string because it was already in the |
| original name. In cases where it's ambiguous, we assume that |
| any '_' originated from a ':'. */ |
| |
| /* Initial '_'s in method name can't have been generating by |
| converting ':'s. Skip them. */ |
| while (*cp && *cp == '_') |
| cp++; |
| |
| /* If the method name does not end with '_', then it has no |
| arguments and there was no replacement of ':'s with '_'s |
| during mangling. Check for that case, and skip any |
| replacement if so. This at least guarantees that methods |
| with no arguments are always demangled correctly (unless the |
| original name ends with '_'). */ |
| if (*(mangled + strlen (mangled) - 1) != '_') |
| { |
| /* Skip to the end. */ |
| for (; *cp; cp++) |
| ; |
| } |
| else |
| { |
| /* Replace remaining '_' with ':'. This may get it wrong if |
| there were '_'s in the original name. In most cases it |
| is impossible to disambiguate. */ |
| for (; *cp; cp++) |
| if (*cp == '_') |
| *cp = ':'; |
| } |
| *cp++ = ']'; /* closing right brace */ |
| *cp++ = 0; /* string terminator */ |
| return demangled; |
| } |
| else |
| return NULL; /* not an objc mangled name */ |
| } |
| |
| /* Try to pretty-print a decl. If the 'decl' is an Objective-C |
| specific decl, return the printable name for it. If not, return |
| NULL. */ |
| const char * |
| objc_maybe_printable_name (tree decl, int v ATTRIBUTE_UNUSED) |
| { |
| switch (TREE_CODE (decl)) |
| { |
| case FUNCTION_DECL: |
| return objc_demangle (IDENTIFIER_POINTER (DECL_NAME (decl))); |
| |
| /* The following happens when we are printing a deprecation |
| warning for a method. The warn_deprecation() will end up |
| trying to print the decl for INSTANCE_METHOD_DECL or |
| CLASS_METHOD_DECL. It would be nice to be able to print |
| "-[NSObject autorelease] is deprecated", but to do that, we'd |
| need to store the class and method name in the method decl, |
| which we currently don't do. For now, just return the name |
| of the method. We don't return NULL, because that may |
| trigger further attempts to pretty-print the decl in C/C++, |
| but they wouldn't know how to pretty-print it. */ |
| case INSTANCE_METHOD_DECL: |
| case CLASS_METHOD_DECL: |
| return IDENTIFIER_POINTER (DECL_NAME (decl)); |
| /* This happens when printing a deprecation warning for a |
| property. We may want to consider some sort of pretty |
| printing (eg, include the class name where it was declared |
| ?). */ |
| case PROPERTY_DECL: |
| return IDENTIFIER_POINTER (PROPERTY_NAME (decl)); |
| default: |
| return NULL; |
| } |
| } |
| |
| /* Return a printable name for 'decl'. This first tries |
| objc_maybe_printable_name(), and if that fails, it returns the name |
| in the decl. This is used as LANG_HOOKS_DECL_PRINTABLE_NAME for |
| Objective-C; in Objective-C++, setting the hook is not enough |
| because lots of C++ Front-End code calls cxx_printable_name, |
| dump_decl and other C++ functions directly. So instead we have |
| modified dump_decl to call objc_maybe_printable_name directly. */ |
| const char * |
| objc_printable_name (tree decl, int v) |
| { |
| const char *demangled_name = objc_maybe_printable_name (decl, v); |
| |
| if (demangled_name != NULL) |
| return demangled_name; |
| else |
| return IDENTIFIER_POINTER (DECL_NAME (decl)); |
| } |
| |
| /* Routine is called to issue diagnostic when reference to a private |
| ivar is made and no other variable with same name is found in |
| current scope. */ |
| bool |
| objc_diagnose_private_ivar (tree id) |
| { |
| tree ivar; |
| if (!objc_method_context) |
| return false; |
| ivar = is_ivar (objc_ivar_chain, id); |
| if (ivar && is_private (ivar)) |
| { |
| error ("instance variable %qs is declared private", |
| IDENTIFIER_POINTER (id)); |
| return true; |
| } |
| return false; |
| } |
| |
| /* Look up ID as an instance variable. OTHER contains the result of |
| the C or C++ lookup, which we may want to use instead. */ |
| /* To use properties inside an instance method, use self.property. */ |
| tree |
| objc_lookup_ivar (tree other, tree id) |
| { |
| tree ivar; |
| |
| /* If we are not inside of an ObjC method, ivar lookup makes no sense. */ |
| if (!objc_method_context) |
| return other; |
| |
| if (!strcmp (IDENTIFIER_POINTER (id), "super")) |
| /* We have a message to super. */ |
| return get_super_receiver (); |
| |
| /* In a class method, look up an instance variable only as a last |
| resort. */ |
| if (TREE_CODE (objc_method_context) == CLASS_METHOD_DECL |
| && other && other != error_mark_node) |
| return other; |
| |
| /* Don't look up the ivar if the user has explicitly advised against |
| it with -fno-local-ivars. */ |
| |
| if (!flag_local_ivars) |
| return other; |
| |
| /* Look up the ivar, but do not use it if it is not accessible. */ |
| ivar = is_ivar (objc_ivar_chain, id); |
| |
| if (!ivar || is_private (ivar)) |
| return other; |
| |
| /* In an instance method, a local variable (or parameter) may hide the |
| instance variable. */ |
| if (TREE_CODE (objc_method_context) == INSTANCE_METHOD_DECL |
| && other && other != error_mark_node |
| #ifdef OBJCPLUS |
| && CP_DECL_CONTEXT (other) != global_namespace) |
| #else |
| && !DECL_FILE_SCOPE_P (other)) |
| #endif |
| { |
| if (warn_shadow_ivar == 1 || (warn_shadow && warn_shadow_ivar != 0)) { |
| warning (warn_shadow_ivar ? OPT_Wshadow_ivar : OPT_Wshadow, |
| "local declaration of %qE hides instance variable", id); |
| } |
| |
| return other; |
| } |
| |
| /* At this point, we are either in an instance method with no obscuring |
| local definitions, or in a class method with no alternate definitions |
| at all. */ |
| return build_ivar_reference (id); |
| } |
| |
| /* Possibly rewrite a function CALL into an OBJ_TYPE_REF expression. This |
| needs to be done if we are calling a function through a cast. */ |
| |
| tree |
| objc_rewrite_function_call (tree function, tree first_param) |
| { |
| if (TREE_CODE (function) == NOP_EXPR |
| && TREE_CODE (TREE_OPERAND (function, 0)) == ADDR_EXPR |
| && TREE_CODE (TREE_OPERAND (TREE_OPERAND (function, 0), 0)) |
| == FUNCTION_DECL) |
| function = build3 (OBJ_TYPE_REF, TREE_TYPE (function), |
| TREE_OPERAND (function, 0), first_param, |
| build_int_cst (TREE_TYPE (first_param), 0)); |
| |
| return function; |
| } |
| |
| /* This is called to "gimplify" a PROPERTY_REF node. It builds the |
| corresponding 'getter' function call. Note that we assume the |
| PROPERTY_REF to be valid since we generated it while parsing. */ |
| static void |
| objc_gimplify_property_ref (tree *expr_p) |
| { |
| tree getter = PROPERTY_REF_GETTER_CALL (*expr_p); |
| tree call_exp; |
| |
| if (getter == NULL_TREE) |
| { |
| tree property_decl = PROPERTY_REF_PROPERTY_DECL (*expr_p); |
| /* This can happen if DECL_ARTIFICIAL (*expr_p), but |
| should be impossible for real properties, which always |
| have a getter. */ |
| error_at (EXPR_LOCATION (*expr_p), "no %qs getter found", |
| IDENTIFIER_POINTER (PROPERTY_NAME (property_decl))); |
| /* Try to recover from the error to prevent an ICE. We take |
| zero and cast it to the type of the property. */ |
| *expr_p = convert (TREE_TYPE (property_decl), |
| integer_zero_node); |
| return; |
| } |
| |
| /* FIXME, this should be a label indicating availability in general. */ |
| if (PROPERTY_REF_DEPRECATED_GETTER (*expr_p)) |
| { |
| if (TREE_UNAVAILABLE (PROPERTY_REF_DEPRECATED_GETTER (*expr_p))) |
| error_unavailable_use (PROPERTY_REF_DEPRECATED_GETTER (*expr_p), |
| NULL_TREE); |
| else |
| /* PROPERTY_REF_DEPRECATED_GETTER contains the method prototype |
| that is deprecated. */ |
| warn_deprecated_use (PROPERTY_REF_DEPRECATED_GETTER (*expr_p), |
| NULL_TREE); |
| } |
| |
| call_exp = getter; |
| #ifdef OBJCPLUS |
| /* In C++, a getter which returns an aggregate value results in a |
| target_expr which initializes a temporary to the call |
| expression. */ |
| if (TREE_CODE (getter) == TARGET_EXPR) |
| { |
| gcc_assert (MAYBE_CLASS_TYPE_P (TREE_TYPE (getter))); |
| gcc_assert (TREE_CODE (TREE_OPERAND (getter, 0)) == VAR_DECL); |
| call_exp = TREE_OPERAND (getter, 1); |
| } |
| #endif |
| gcc_checking_assert ((flag_objc_nilcheck |
| && TREE_CODE (call_exp) == COND_EXPR) |
| || TREE_CODE (call_exp) == CALL_EXPR); |
| |
| *expr_p = call_exp; |
| } |
| |
| /* This is called when "gimplifying" the trees. We need to gimplify |
| the Objective-C/Objective-C++ specific trees, then hand over the |
| process to C/C++. */ |
| int |
| objc_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p) |
| { |
| enum tree_code code = TREE_CODE (*expr_p); |
| switch (code) |
| { |
| /* Look for the special case of OBJC_TYPE_REF with the address |
| of a function in OBJ_TYPE_REF_EXPR (presumably objc_msgSend |
| or one of its cousins). */ |
| case OBJ_TYPE_REF: |
| if (TREE_CODE (OBJ_TYPE_REF_EXPR (*expr_p)) == ADDR_EXPR |
| && TREE_CODE (TREE_OPERAND (OBJ_TYPE_REF_EXPR (*expr_p), 0)) |
| == FUNCTION_DECL) |
| { |
| enum gimplify_status r0, r1; |
| |
| /* Postincrements in OBJ_TYPE_REF_OBJECT don't affect the |
| value of the OBJ_TYPE_REF, so force them to be emitted |
| during subexpression evaluation rather than after the |
| OBJ_TYPE_REF. This permits objc_msgSend calls in |
| Objective C to use direct rather than indirect calls when |
| the object expression has a postincrement. */ |
| r0 = gimplify_expr (&OBJ_TYPE_REF_OBJECT (*expr_p), pre_p, NULL, |
| is_gimple_val, fb_rvalue); |
| r1 = gimplify_expr (&OBJ_TYPE_REF_EXPR (*expr_p), pre_p, post_p, |
| is_gimple_val, fb_rvalue); |
| |
| return MIN (r0, r1); |
| } |
| break; |
| case PROPERTY_REF: |
| objc_gimplify_property_ref (expr_p); |
| /* Do not return yet; let C/C++ gimplify the resulting expression. */ |
| break; |
| default: |
| break; |
| } |
| |
| #ifdef OBJCPLUS |
| return (enum gimplify_status) cp_gimplify_expr (expr_p, pre_p, post_p); |
| #else |
| return (enum gimplify_status) c_gimplify_expr (expr_p, pre_p, post_p); |
| #endif |
| } |
| |
| /* --- FAST ENUMERATION --- */ |
| /* Begin code generation for fast enumeration (foreach) ... */ |
| |
| /* Defines |
| |
| struct __objcFastEnumerationState |
| { |
| unsigned long state; |
| id *itemsPtr; |
| unsigned long *mutationsPtr; |
| unsigned long extra[5]; |
| }; |
| |
| Confusingly enough, NSFastEnumeration is then defined by libraries |
| to be the same structure. |
| */ |
| |
| static void |
| build_fast_enumeration_state_template (void) |
| { |
| tree decls, *chain = NULL; |
| |
| /* { */ |
| objc_fast_enumeration_state_template = objc_start_struct (get_identifier |
| (TAG_FAST_ENUMERATION_STATE)); |
| |
| /* unsigned long state; */ |
| decls = add_field_decl (long_unsigned_type_node, "state", &chain); |
| |
| /* id *itemsPtr; */ |
| add_field_decl (build_pointer_type (objc_object_type), |
| "itemsPtr", &chain); |
| |
| /* unsigned long *mutationsPtr; */ |
| add_field_decl (build_pointer_type (long_unsigned_type_node), |
| "mutationsPtr", &chain); |
| |
| /* unsigned long extra[5]; */ |
| add_field_decl (build_sized_array_type (long_unsigned_type_node, 5), |
| "extra", &chain); |
| |
| /* } */ |
| objc_finish_struct (objc_fast_enumeration_state_template, decls); |
| } |
| |
| /* |
| 'objc_finish_foreach_loop()' generates the code for an Objective-C |
| foreach loop. The 'location' argument is the location of the 'for' |
| that starts the loop. The 'object_expression' is the expression of |
| the 'object' that iterates; the 'collection_expression' is the |
| expression of the collection that we iterate over (we need to make |
| sure we evaluate this only once); the 'for_body' is the set of |
| statements to be executed in each iteration; 'break_label' and |
| 'continue_label' are the break and continue labels which we need to |
| emit since the <statements> may be jumping to 'break_label' (if they |
| contain 'break') or to 'continue_label' (if they contain |
| 'continue'). |
| |
| The syntax is |
| |
| for (<object expression> in <collection expression>) |
| <statements> |
| |
| which is compiled into the following blurb: |
| |
| { |
| id __objc_foreach_collection; |
| __objc_fast_enumeration_state __objc_foreach_enum_state; |
| unsigned long __objc_foreach_batchsize; |
| id __objc_foreach_items[16]; |
| __objc_foreach_collection = <collection expression>; |
| __objc_foreach_enum_state = { 0 }; |
| __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; |
| |
| if (__objc_foreach_batchsize == 0) |
| <object expression> = nil; |
| else |
| { |
| unsigned long __objc_foreach_mutations_pointer = *__objc_foreach_enum_state.mutationsPtr; |
| next_batch: |
| { |
| unsigned long __objc_foreach_index; |
| __objc_foreach_index = 0; |
| |
| next_object: |
| if (__objc_foreach_mutation_pointer != *__objc_foreach_enum_state.mutationsPtr) objc_enumeration_mutation (<collection expression>); |
| <object expression> = enumState.itemsPtr[__objc_foreach_index]; |
| <statements> [PS: inside <statments>, 'break' jumps to break_label and 'continue' jumps to continue_label] |
| |
| continue_label: |
| __objc_foreach_index++; |
| if (__objc_foreach_index < __objc_foreach_batchsize) goto next_object; |
| __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; |
| } |
| if (__objc_foreach_batchsize != 0) goto next_batch; |
| <object expression> = nil; |
| break_label: |
| } |
| } |
| |
| 'statements' may contain a 'continue' or 'break' instruction, which |
| the user expects to 'continue' or 'break' the entire foreach loop. |
| We are provided the labels that 'break' and 'continue' jump to, so |
| we place them where we want them to jump to when they pick them. |
| |
| Optimization TODO: we could cache the IMP of |
| countByEnumeratingWithState:objects:count:. |
| */ |
| |
| /* If you need to debug objc_finish_foreach_loop(), uncomment the following line. */ |
| /* #define DEBUG_OBJC_FINISH_FOREACH_LOOP 1 */ |
| |
| #ifdef DEBUG_OBJC_FINISH_FOREACH_LOOP |
| #include "tree-pretty-print.h" |
| #endif |
| |
| void |
| objc_finish_foreach_loop (location_t location, tree object_expression, tree collection_expression, tree for_body, |
| tree break_label, tree continue_label) |
| { |
| /* A tree representing the __objcFastEnumerationState struct type, |
| or NSFastEnumerationState struct, whatever we are using. */ |
| tree objc_fast_enumeration_state_type; |
| |
| /* The trees representing the declarations of each of the local variables. */ |
| tree objc_foreach_collection_decl; |
| tree objc_foreach_enum_state_decl; |
| tree objc_foreach_items_decl; |
| tree objc_foreach_batchsize_decl; |
| tree objc_foreach_mutations_pointer_decl; |
| tree objc_foreach_index_decl; |
| |
| /* A tree representing the selector countByEnumeratingWithState:objects:count:. */ |
| tree selector_name; |
| |
| /* A tree representing the local bind. */ |
| tree bind; |
| |
| /* A tree representing the external 'if (__objc_foreach_batchsize)' */ |
| tree first_if; |
| |
| /* A tree representing the 'else' part of 'first_if' */ |
| tree first_else; |
| |
| /* A tree representing the 'next_batch' label. */ |
| tree next_batch_label_decl; |
| |
| /* A tree representing the binding after the 'next_batch' label. */ |
| tree next_batch_bind; |
| |
| /* A tree representing the 'next_object' label. */ |
| tree next_object_label_decl; |
| |
| /* Temporary variables. */ |
| tree t; |
| int i; |
| |
| if (flag_objc1_only) |
| error_at (location, "fast enumeration is not available in Objective-C 1.0"); |
| |
| if (object_expression == error_mark_node) |
| return; |
| |
| if (collection_expression == error_mark_node) |
| return; |
| |
| if (!objc_type_valid_for_messaging (TREE_TYPE (object_expression), true)) |
| { |
| error_at (location, "iterating variable in fast enumeration is not an object"); |
| return; |
| } |
| |
| if (!objc_type_valid_for_messaging (TREE_TYPE (collection_expression), true)) |
| { |
| error_at (location, "collection in fast enumeration is not an object"); |
| return; |
| } |
| |
| /* TODO: Check that object_expression is either a variable |
| declaration, or an lvalue. */ |
| |
| /* This kludge is an idea from apple. We use the |
| __objcFastEnumerationState struct implicitly defined by the |
| compiler, unless a NSFastEnumerationState struct has been defined |
| (by a Foundation library such as GNUstep Base) in which case, we |
| use that one. |
| */ |
| objc_fast_enumeration_state_type = objc_fast_enumeration_state_template; |
| { |
| tree objc_NSFastEnumeration_type = lookup_name (get_identifier ("NSFastEnumerationState")); |
| |
| if (objc_NSFastEnumeration_type) |
| { |
| /* TODO: We really need to check that |
| objc_NSFastEnumeration_type is the same as ours! */ |
| if (TREE_CODE (objc_NSFastEnumeration_type) == TYPE_DECL) |
| { |
| /* If it's a typedef, use the original type. */ |
| if (DECL_ORIGINAL_TYPE (objc_NSFastEnumeration_type)) |
| objc_fast_enumeration_state_type = DECL_ORIGINAL_TYPE (objc_NSFastEnumeration_type); |
| else |
| objc_fast_enumeration_state_type = TREE_TYPE (objc_NSFastEnumeration_type); |
| } |
| } |
| } |
| |
| /* { */ |
| /* Done by c-parser.cc. */ |
| |
| /* type object; */ |
| /* Done by c-parser.cc. */ |
| |
| /* Disable warnings that 'object' is unused. For example the code |
| |
| for (id object in collection) |
| i++; |
| |
| which can be used to count how many objects there are in the |
| collection is fine and should generate no warnings even if |
| 'object' is technically unused. */ |
| TREE_USED (object_expression) = 1; |
| if (DECL_P (object_expression)) |
| DECL_READ_P (object_expression) = 1; |
| |
| /* id __objc_foreach_collection */ |
| objc_foreach_collection_decl = objc_create_temporary_var (objc_object_type, "__objc_foreach_collection"); |
| |
| /* __objcFastEnumerationState __objc_foreach_enum_state; */ |
| objc_foreach_enum_state_decl = objc_create_temporary_var (objc_fast_enumeration_state_type, "__objc_foreach_enum_state"); |
| TREE_CHAIN (objc_foreach_enum_state_decl) = objc_foreach_collection_decl; |
| |
| /* id __objc_foreach_items[16]; */ |
| objc_foreach_items_decl = objc_create_temporary_var (build_sized_array_type (objc_object_type, 16), "__objc_foreach_items"); |
| TREE_CHAIN (objc_foreach_items_decl) = objc_foreach_enum_state_decl; |
| |
| /* unsigned long __objc_foreach_batchsize; */ |
| objc_foreach_batchsize_decl = objc_create_temporary_var (long_unsigned_type_node, "__objc_foreach_batchsize"); |
| TREE_CHAIN (objc_foreach_batchsize_decl) = objc_foreach_items_decl; |
| |
| /* Generate the local variable binding. */ |
| bind = build3 (BIND_EXPR, void_type_node, objc_foreach_batchsize_decl, NULL, NULL); |
| SET_EXPR_LOCATION (bind, location); |
| TREE_SIDE_EFFECTS (bind) = 1; |
| |
| /* __objc_foreach_collection = <collection expression>; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_collection_decl, collection_expression); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (bind)); |
| /* We have used 'collection_expression'. */ |
| mark_exp_read (collection_expression); |
| |
| /* __objc_foreach_enum_state.state = 0; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("state")), |
| build_int_cst (long_unsigned_type_node, 0)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (bind)); |
| |
| /* __objc_foreach_enum_state.itemsPtr = NULL; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("itemsPtr")), |
| null_pointer_node); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (bind)); |
| |
| /* __objc_foreach_enum_state.mutationsPtr = NULL; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("mutationsPtr")), |
| null_pointer_node); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (bind)); |
| |
| /* __objc_foreach_enum_state.extra[0] = 0; */ |
| /* __objc_foreach_enum_state.extra[1] = 0; */ |
| /* __objc_foreach_enum_state.extra[2] = 0; */ |
| /* __objc_foreach_enum_state.extra[3] = 0; */ |
| /* __objc_foreach_enum_state.extra[4] = 0; */ |
| for (i = 0; i < 5 ; i++) |
| { |
| t = build2 (MODIFY_EXPR, void_type_node, |
| build_array_ref (location, objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("extra")), |
| build_int_cst (NULL_TREE, i)), |
| build_int_cst (long_unsigned_type_node, 0)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (bind)); |
| } |
| |
| /* __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; */ |
| selector_name = get_identifier ("countByEnumeratingWithState:objects:count:"); |
| #ifdef OBJCPLUS |
| t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, |
| /* Parameters. */ |
| tree_cons /* &__objc_foreach_enum_state */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), |
| tree_cons /* __objc_foreach_items */ |
| (NULL_TREE, objc_foreach_items_decl, |
| tree_cons /* 16 */ |
| (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); |
| #else |
| /* In C, we need to decay the __objc_foreach_items array that we are passing. */ |
| { |
| struct c_expr array; |
| array.value = objc_foreach_items_decl; |
| t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, |
| /* Parameters. */ |
| tree_cons /* &__objc_foreach_enum_state */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), |
| tree_cons /* __objc_foreach_items */ |
| (NULL_TREE, default_function_array_conversion (location, array).value, |
| tree_cons /* 16 */ |
| (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); |
| } |
| #endif |
| t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_batchsize_decl, |
| convert (long_unsigned_type_node, t)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (bind)); |
| |
| /* if (__objc_foreach_batchsize == 0) */ |
| first_if = build3 (COND_EXPR, void_type_node, |
| /* Condition. */ |
| c_fully_fold |
| (c_common_truthvalue_conversion |
| (location, |
| build_binary_op (location, |
| EQ_EXPR, |
| objc_foreach_batchsize_decl, |
| build_int_cst (long_unsigned_type_node, 0), 1)), |
| false, NULL), |
| /* Then block (we fill it in later). */ |
| NULL_TREE, |
| /* Else block (we fill it in later). */ |
| NULL_TREE); |
| SET_EXPR_LOCATION (first_if, location); |
| append_to_statement_list (first_if, &BIND_EXPR_BODY (bind)); |
| |
| /* then <object expression> = nil; */ |
| t = build2 (MODIFY_EXPR, void_type_node, object_expression, convert (objc_object_type, null_pointer_node)); |
| SET_EXPR_LOCATION (t, location); |
| COND_EXPR_THEN (first_if) = t; |
| |
| /* Now we build the 'else' part of the if; once we finish building |
| it, we attach it to first_if as the 'else' part. */ |
| |
| /* else */ |
| /* { */ |
| |
| /* unsigned long __objc_foreach_mutations_pointer; */ |
| objc_foreach_mutations_pointer_decl = objc_create_temporary_var (long_unsigned_type_node, "__objc_foreach_mutations_pointer"); |
| |
| /* Generate the local variable binding. */ |
| first_else = build3 (BIND_EXPR, void_type_node, objc_foreach_mutations_pointer_decl, NULL, NULL); |
| SET_EXPR_LOCATION (first_else, location); |
| TREE_SIDE_EFFECTS (first_else) = 1; |
| |
| /* __objc_foreach_mutations_pointer = *__objc_foreach_enum_state.mutationsPtr; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_mutations_pointer_decl, |
| build_indirect_ref (location, objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("mutationsPtr")), |
| RO_UNARY_STAR)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); |
| |
| /* next_batch: */ |
| next_batch_label_decl = create_artificial_label (location); |
| t = build1 (LABEL_EXPR, void_type_node, next_batch_label_decl); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); |
| |
| /* { */ |
| |
| /* unsigned long __objc_foreach_index; */ |
| objc_foreach_index_decl = objc_create_temporary_var (long_unsigned_type_node, "__objc_foreach_index"); |
| |
| /* Generate the local variable binding. */ |
| next_batch_bind = build3 (BIND_EXPR, void_type_node, objc_foreach_index_decl, NULL, NULL); |
| SET_EXPR_LOCATION (next_batch_bind, location); |
| TREE_SIDE_EFFECTS (next_batch_bind) = 1; |
| append_to_statement_list (next_batch_bind, &BIND_EXPR_BODY (first_else)); |
| |
| /* __objc_foreach_index = 0; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_index_decl, |
| build_int_cst (long_unsigned_type_node, 0)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* next_object: */ |
| next_object_label_decl = create_artificial_label (location); |
| t = build1 (LABEL_EXPR, void_type_node, next_object_label_decl); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* if (__objc_foreach_mutation_pointer != *__objc_foreach_enum_state.mutationsPtr) objc_enumeration_mutation (<collection expression>); */ |
| t = build3 (COND_EXPR, void_type_node, |
| /* Condition. */ |
| c_fully_fold |
| (c_common_truthvalue_conversion |
| (location, |
| build_binary_op |
| (location, |
| NE_EXPR, |
| objc_foreach_mutations_pointer_decl, |
| build_indirect_ref (location, |
| objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("mutationsPtr")), |
| RO_UNARY_STAR), 1)), |
| false, NULL), |
| /* Then block. */ |
| build_function_call (input_location, |
| objc_enumeration_mutation_decl, |
| tree_cons (NULL, collection_expression, NULL)), |
| /* Else block. */ |
| NULL_TREE); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* <object expression> = enumState.itemsPtr[__objc_foreach_index]; */ |
| t = build2 (MODIFY_EXPR, void_type_node, object_expression, |
| build_array_ref (location, objc_build_component_ref (objc_foreach_enum_state_decl, |
| get_identifier ("itemsPtr")), |
| objc_foreach_index_decl)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* <statements> [PS: in <statments>, 'break' jumps to break_label and 'continue' jumps to continue_label] */ |
| append_to_statement_list (for_body, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* continue_label: */ |
| if (continue_label) |
| { |
| t = build1 (LABEL_EXPR, void_type_node, continue_label); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| } |
| |
| /* __objc_foreach_index++; */ |
| t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_index_decl, |
| build_binary_op (location, |
| PLUS_EXPR, |
| objc_foreach_index_decl, |
| build_int_cst (long_unsigned_type_node, 1), 1)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* if (__objc_foreach_index < __objc_foreach_batchsize) goto next_object; */ |
| t = build3 (COND_EXPR, void_type_node, |
| /* Condition. */ |
| c_fully_fold |
| (c_common_truthvalue_conversion |
| (location, |
| build_binary_op (location, |
| LT_EXPR, |
| objc_foreach_index_decl, |
| objc_foreach_batchsize_decl, 1)), |
| false, NULL), |
| /* Then block. */ |
| build1 (GOTO_EXPR, void_type_node, next_object_label_decl), |
| /* Else block. */ |
| NULL_TREE); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* __objc_foreach_batchsize = [__objc_foreach_collection countByEnumeratingWithState: &__objc_foreach_enum_state objects: __objc_foreach_items count: 16]; */ |
| #ifdef OBJCPLUS |
| t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, |
| /* Parameters. */ |
| tree_cons /* &__objc_foreach_enum_state */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), |
| tree_cons /* __objc_foreach_items */ |
| (NULL_TREE, objc_foreach_items_decl, |
| tree_cons /* 16 */ |
| (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); |
| #else |
| /* In C, we need to decay the __objc_foreach_items array that we are passing. */ |
| { |
| struct c_expr array; |
| array.value = objc_foreach_items_decl; |
| t = objc_finish_message_expr (objc_foreach_collection_decl, selector_name, |
| /* Parameters. */ |
| tree_cons /* &__objc_foreach_enum_state */ |
| (NULL_TREE, build_fold_addr_expr_loc (location, objc_foreach_enum_state_decl), |
| tree_cons /* __objc_foreach_items */ |
| (NULL_TREE, default_function_array_conversion (location, array).value, |
| tree_cons /* 16 */ |
| (NULL_TREE, build_int_cst (NULL_TREE, 16), NULL_TREE))), NULL); |
| } |
| #endif |
| t = build2 (MODIFY_EXPR, void_type_node, objc_foreach_batchsize_decl, |
| convert (long_unsigned_type_node, t)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (next_batch_bind)); |
| |
| /* } */ |
| |
| /* if (__objc_foreach_batchsize != 0) goto next_batch; */ |
| t = build3 (COND_EXPR, void_type_node, |
| /* Condition. */ |
| c_fully_fold |
| (c_common_truthvalue_conversion |
| (location, |
| build_binary_op (location, |
| NE_EXPR, |
| objc_foreach_batchsize_decl, |
| build_int_cst (long_unsigned_type_node, 0), 1)), |
| false, NULL), |
| /* Then block. */ |
| build1 (GOTO_EXPR, void_type_node, next_batch_label_decl), |
| /* Else block. */ |
| NULL_TREE); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); |
| |
| /* <object expression> = nil; */ |
| t = build2 (MODIFY_EXPR, void_type_node, object_expression, convert (objc_object_type, null_pointer_node)); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); |
| |
| /* break_label: */ |
| if (break_label) |
| { |
| t = build1 (LABEL_EXPR, void_type_node, break_label); |
| SET_EXPR_LOCATION (t, location); |
| append_to_statement_list (t, &BIND_EXPR_BODY (first_else)); |
| } |
| |
| /* } */ |
| COND_EXPR_ELSE (first_if) = first_else; |
| |
| /* Do the whole thing. */ |
| add_stmt (bind); |
| |
| #ifdef DEBUG_OBJC_FINISH_FOREACH_LOOP |
| /* This will print to stderr the whole blurb generated by the |
| compiler while compiling (assuming the compiler doesn't crash |
| before getting here). |
| */ |
| debug_generic_stmt (bind); |
| #endif |
| |
| /* } */ |
| /* Done by c-parser.cc */ |
| } |
| |
| /* --- SUPPORT FOR FORMAT ARG CHECKING --- */ |
| /* Return true if we have an NxString object pointer. */ |
| |
| bool |
| objc_string_ref_type_p (tree strp) |
| { |
| tree tmv; |
| if (!strp || TREE_CODE (strp) != POINTER_TYPE) |
| return false; |
| |
| tmv = TYPE_MAIN_VARIANT (TREE_TYPE (strp)); |
| tmv = OBJC_TYPE_NAME (tmv); |
| return (tmv |
| && TREE_CODE (tmv) == IDENTIFIER_NODE |
| && IDENTIFIER_POINTER (tmv) |
| && startswith (IDENTIFIER_POINTER (tmv), "NSString")); |
| } |
| |
| /* At present the behavior of this is undefined and it does nothing. */ |
| void |
| objc_check_format_arg (tree ARG_UNUSED (format_arg), |
| tree ARG_UNUSED (args_list)) |
| { |
| } |
| |
| void |
| objc_common_init_ts (void) |
| { |
| c_common_init_ts (); |
| |
| MARK_TS_DECL_NON_COMMON (CLASS_METHOD_DECL); |
| MARK_TS_DECL_NON_COMMON (INSTANCE_METHOD_DECL); |
| MARK_TS_DECL_NON_COMMON (KEYWORD_DECL); |
| MARK_TS_DECL_NON_COMMON (PROPERTY_DECL); |
| |
| MARK_TS_COMMON (CLASS_INTERFACE_TYPE); |
| MARK_TS_COMMON (PROTOCOL_INTERFACE_TYPE); |
| MARK_TS_COMMON (CLASS_IMPLEMENTATION_TYPE); |
| |
| MARK_TS_TYPED (MESSAGE_SEND_EXPR); |
| MARK_TS_TYPED (PROPERTY_REF); |
| } |
| |
| size_t |
| objc_common_tree_size (enum tree_code code) |
| { |
| switch (code) |
| { |
| case CLASS_METHOD_DECL: |
| case INSTANCE_METHOD_DECL: |
| case KEYWORD_DECL: |
| case PROPERTY_DECL: return sizeof (tree_decl_non_common); |
| case CLASS_INTERFACE_TYPE: |
| case CLASS_IMPLEMENTATION_TYPE: |
| case CATEGORY_INTERFACE_TYPE: |
| case CATEGORY_IMPLEMENTATION_TYPE: |
| case PROTOCOL_INTERFACE_TYPE: return sizeof (tree_type_non_common); |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| |
| #include "gt-objc-objc-act.h" |