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| author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
|---|---|---|
| committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
| commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
| tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/objc/objc-act.c | |
| download | cbb-gcc-4.6.4-15d2061ac0796199866debe9ac87130894b0cdd3.tar.bz2 cbb-gcc-4.6.4-15d2061ac0796199866debe9ac87130894b0cdd3.tar.xz | |
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Diffstat (limited to 'gcc/objc/objc-act.c')
| -rw-r--r-- | gcc/objc/objc-act.c | 10575 |
1 files changed, 10575 insertions, 0 deletions
diff --git a/gcc/objc/objc-act.c b/gcc/objc/objc-act.c new file mode 100644 index 000000000..cca60a071 --- /dev/null +++ b/gcc/objc/objc-act.c @@ -0,0 +1,10575 @@ +/* Implement classes and message passing for Objective C. + Copyright (C) 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, + 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 + 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" + +#ifdef OBJCPLUS +#include "cp-tree.h" +#else +#include "c-tree.h" +#include "c-lang.h" +#endif + +#include "c-family/c-common.h" +#include "c-family/c-objc.h" +#include "c-family/c-pragma.h" +#include "c-family/c-format.h" +#include "flags.h" +#include "langhooks.h" +#include "objc-act.h" +#include "input.h" +#include "function.h" +#include "output.h" +#include "toplev.h" +#include "ggc.h" +#include "debug.h" +#include "target.h" +#include "diagnostic-core.h" +#include "intl.h" +#include "cgraph.h" +#include "tree-iterator.h" +#include "hashtab.h" +#include "langhooks-def.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 (). */ +#include "tree-pretty-print.h" + +/* For enum gimplify_status */ +#include "gimple.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 + +/* Set up for use of obstacks. */ + +#include "obstack.h" + +/* This obstack is used to accumulate the encoding of a data type. */ +struct obstack util_obstack; + +/* This points to the beginning of obstack contents, so we can free + the whole contents. */ +char *util_firstobj; + +/*** 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); + +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 char *objc_build_property_setter_name (tree); +static int match_proto_with_proto (tree, tree, int); +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); + +/* Hash tables to manage the global pool of method prototypes. */ +static void hash_init (void); + +hash *nst_method_hash_list = 0; +hash *cls_method_hash_list = 0; + +/* Hash tables to manage the global pool of class names. */ + +hash *cls_name_hash_list = 0; +hash *als_name_hash_list = 0; + +hash *ivar_offset_hash_list = 0; + +static void hash_class_name_enter (hash *, tree, tree); +static hash hash_class_name_lookup (hash *, tree); + +static hash hash_lookup (hash *, tree); +static tree lookup_method (tree, tree); +static tree lookup_method_static (tree, tree, int); + +static tree add_class (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); + +/* Type encoding. */ + +static void encode_type_qualifiers (tree); +static void encode_type (tree, int, int); + +#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 (hash, 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; + +/* 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,gc) *local_variables_to_volatilize = NULL; + +/* Store all constructed constant strings in a hash table so that + they get uniqued properly. */ + +struct GTY(()) string_descriptor { + /* The literal argument . */ + tree literal; + + /* The resulting constant string. */ + tree constructor; +}; + +static GTY((param_is (struct string_descriptor))) htab_t string_htab; + +FILE *gen_declaration_file; + +/* Tells "encode_pointer/encode_aggregate" whether we are generating + type descriptors for instance variables (as opposed to methods). + Type descriptors for instance variables contain more information + than methods (for static typing and embedded structures). */ + +int generating_instance_variables = 0; + +/* 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); + hash_init (); + gcc_obstack_init (&util_obstack); + util_firstobj = (char *) obstack_finish (&util_obstack); + + /* ... 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; + + /* Generate general types and push runtime-specific decls to file scope. */ + synth_module_prologue (); + + return true; +} + +/* This is called automatically (at the very end of compilation) by + c_write_global_declarations and cp_write_global_declarations. */ +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) + { + int slot; + hash hsh; + + /* Run through the selector hash tables and print a warning for any + selector which has multiple methods. */ + + for (slot = 0; slot < SIZEHASHTABLE; slot++) + { + for (hsh = cls_method_hash_list[slot]; hsh; hsh = hsh->next) + check_duplicates (hsh, 0, 1); + for (hsh = nst_method_hash_list[slot]; hsh; hsh = hsh->next) + check_duplicates (hsh, 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 ("can%'t 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, tree super_class, + tree protos, tree attributes) +{ + if (flag_objc1_only && attributes) + error_at (input_location, "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_IVAR_VIS_PROTECTED; +} + +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_IVAR_VIS_PROTECTED; +} + +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 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. 'parsed_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 + 'parsed_property_setter_ident'. */ +void +objc_add_property_declaration (location_t location, tree decl, + bool parsed_property_readonly, bool parsed_property_readwrite, + bool parsed_property_assign, bool parsed_property_retain, + bool parsed_property_copy, bool parsed_property_nonatomic, + tree parsed_property_getter_ident, tree parsed_property_setter_ident) +{ + tree property_decl; + tree x; + /* 'property_readonly' and 'property_assign_semantics' are the final + attributes of the property after all parsed attributes have been + considered (eg, if we parsed no 'readonly' and no 'readwrite', ie + parsed_property_readonly = false and parsed_property_readwrite = + false, then property_readonly will be false because the default + is readwrite). */ + bool property_readonly = false; + objc_property_assign_semantics property_assign_semantics = OBJC_PROPERTY_ASSIGN; + bool property_extension_in_class_extension = false; + + if (flag_objc1_only) + error_at (input_location, "%<@property%> is not available in Objective-C 1.0"); + + if (parsed_property_readonly && parsed_property_readwrite) + { + error_at (location, "%<readonly%> attribute conflicts with %<readwrite%> attribute"); + /* In case of conflicting attributes (here and below), after + producing an error, we pick one of the attributes and keep + going. */ + property_readonly = false; + } + else + { + if (parsed_property_readonly) + property_readonly = true; + + if (parsed_property_readwrite) + property_readonly = false; + } + + if (parsed_property_readonly && parsed_property_setter_ident) + { + error_at (location, "%<readonly%> attribute conflicts with %<setter%> attribute"); + property_readonly = false; + } + + if (parsed_property_assign && parsed_property_retain) + { + error_at (location, "%<assign%> attribute conflicts with %<retain%> attribute"); + property_assign_semantics = OBJC_PROPERTY_RETAIN; + } + else if (parsed_property_assign && parsed_property_copy) + { + error_at (location, "%<assign%> attribute conflicts with %<copy%> attribute"); + property_assign_semantics = OBJC_PROPERTY_COPY; + } + else if (parsed_property_retain && parsed_property_copy) + { + error_at (location, "%<retain%> attribute conflicts with %<copy%> attribute"); + property_assign_semantics = OBJC_PROPERTY_COPY; + } + else + { + if (parsed_property_assign) + property_assign_semantics = OBJC_PROPERTY_ASSIGN; + + if (parsed_property_retain) + property_assign_semantics = OBJC_PROPERTY_RETAIN; + + if (parsed_property_copy) + property_assign_semantics = OBJC_PROPERTY_COPY; + } + + if (!objc_interface_context) + { + error_at (location, "property declaration not in @interface or @protocol context"); + return; + } + + /* At this point we know that we are either in an interface, a + category, or a protocol. */ + + /* We expect a FIELD_DECL from the parser. Make sure we didn't get + something else, as that would confuse the checks below. */ + if (TREE_CODE (decl) != FIELD_DECL) + { + error_at (location, "invalid property declaration"); + return; + } + + /* Do some spot-checks for the most obvious invalid types. */ + + if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) + { + error_at (location, "property can not be an array"); + return; + } + + /* The C++/ObjC++ parser seems to reject the ':' for a bitfield when + parsing, while the C/ObjC parser accepts it and gives us a + FIELD_DECL with a DECL_INITIAL set. So we use the DECL_INITIAL + to check for a bitfield when doing ObjC. */ +#ifndef OBJCPLUS + if (DECL_INITIAL (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 can not be bitfields). The + underlying instance variable could be a bitfield, but that is + a different matter. */ + error_at (location, "property can not be a bit-field"); + return; + } +#endif + + /* 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 (!parsed_property_assign && !parsed_property_retain && !parsed_property_copy) + { + /* Use 'false' so we do not warn for Class objects. */ + if (objc_type_valid_for_messaging (TREE_TYPE (decl), false)) + { + warning_at (location, + 0, + "object property %qD has no %<assign%>, %<retain%> or %<copy%> attribute; assuming %<assign%>", + decl); + inform (location, + "%<assign%> can be unsafe for Objective-C objects; please state explicitly if you need it"); + } + } + } + + if (property_assign_semantics == OBJC_PROPERTY_RETAIN + && !objc_type_valid_for_messaging (TREE_TYPE (decl), true)) + error_at (location, "%<retain%> attribute is only valid for Objective-C objects"); + + if (property_assign_semantics == OBJC_PROPERTY_COPY + && !objc_type_valid_for_messaging (TREE_TYPE (decl), true)) + error_at (location, "%<copy%> attribute is only valid for Objective-C objects"); + + /* 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 + parsed_property_setter_ident and parsed_property_getter_ident + with the final setter and getter identifiers that will be + used. */ + if (parsed_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 (parsed_property_setter_ident); + size_t length = strlen (parsed_setter); + char *final_setter = (char *)alloca (length + 2); + + sprintf (final_setter, "%s:", parsed_setter); + parsed_property_setter_ident = get_identifier (final_setter); + } + else + { + if (!property_readonly) + parsed_property_setter_ident = get_identifier (objc_build_property_setter_name + (DECL_NAME (decl))); + } + + if (!parsed_property_getter_ident) + parsed_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. */ + 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 == 0 + && 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) != parsed_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) != parsed_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) != parsed_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) = parsed_property_setter_ident; + return; + } + } + + /* Create a PROPERTY_DECL node. */ + property_decl = make_node (PROPERTY_DECL); + + /* Copy the basic information from the original decl. */ + TREE_TYPE (property_decl) = TREE_TYPE (decl); + DECL_SOURCE_LOCATION (property_decl) = DECL_SOURCE_LOCATION (decl); + TREE_DEPRECATED (property_decl) = TREE_DEPRECATED (decl); + + /* Add property-specific information. */ + PROPERTY_NAME (property_decl) = DECL_NAME (decl); + PROPERTY_GETTER_NAME (property_decl) = parsed_property_getter_ident; + PROPERTY_SETTER_NAME (property_decl) = parsed_property_setter_ident; + PROPERTY_READONLY (property_decl) = property_readonly; + PROPERTY_NONATOMIC (property_decl) = parsed_property_nonatomic; + PROPERTY_ASSIGN_SEMANTICS (property_decl) = property_assign_semantics; + PROPERTY_IVAR_NAME (property_decl) = NULL_TREE; + PROPERTY_DYNAMIC (property_decl) = 0; + + /* 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; + 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 artifical 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); + + 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 deprecated_method_prototype = 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. */ + &deprecated_method_prototype); + + expression = build4 (PROPERTY_REF, TREE_TYPE(x), object, x, getter_call, + deprecated_method_prototype); + 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_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 deprecated_method_prototype = 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, + &deprecated_method_prototype); + + expression = build4 (PROPERTY_REF, TREE_TYPE(x), object, x, getter_call, + deprecated_method_prototype); + 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; +} + +/* 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 ("readonly property can not be set"); + 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; + } + + /* Unreachable, but the compiler may not realize. */ + return error_mark_node; +} + +/* 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. */ + TREE_NO_WARNING (compound_expr) = 1; + 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". */ + TREE_NO_WARNING (compound_expr) = 1; + 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 ("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). +*/ +bool +objc_start_method_definition (bool is_class_method, tree decl, tree attributes) +{ + 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 by setting these variables + to some non-null, non-label value. We'll notice and emit the proper + error message in c_finish_bc_stmt. */ + c_break_label = c_cont_label = size_zero_node; +#endif + + if (attributes) + warning_at (input_location, 0, "method attributes can not 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); + 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,heap) *objc_info = NULL; + 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; + DECL_ALIGN (base) = 1; + DECL_FIELD_CONTEXT (base) = s; +#ifdef OBJCPLUS + DECL_FIELD_IS_BASE (base) = 1; + + if (fields) + TREE_NO_WARNING (fields) = 1; /* Suppress C++ ABI warnings -- we */ +#endif /* are following the ObjC ABI here. */ + 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); + VEC_safe_push (tree, heap, objc_info, 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) = VEC_index (tree, objc_info, i); + /* Replace the IDENTIFIER_NODE with an actual @interface now + that we have it. */ + TYPE_OBJC_INTERFACE (t) = klass; + } + VEC_free (tree, heap, objc_info); + + /* 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) + local_variables_to_volatilize = VEC_alloc (tree, gc, 8); + + VEC_safe_push (tree, gc, 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 (tree, 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 (tree, gc, 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; + + do + { + ltyp = TREE_TYPE (ltyp); /* Remove indirections. */ + 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) + { + /* 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. */ + for (ltyp = TYPE_ARG_TYPES (ltyp), rtyp = TYPE_ARG_TYPES (rtyp); + ltyp && rtyp; ltyp = TREE_CHAIN (ltyp), rtyp = TREE_CHAIN (rtyp)) + { + if (!comptypes (TREE_VALUE (rtyp), TREE_VALUE (ltyp)) + && !objc_compare_types (TREE_VALUE (rtyp), TREE_VALUE (ltyp), + argno, callee)) + return false; + } + + return (ltyp == rtyp); + } + + /* Past this point, we are only interested in ObjC class instances, + or 'id' or 'Class'. */ + if (TREE_CODE (ltyp) != RECORD_TYPE || TREE_CODE (rtyp) != RECORD_TYPE) + return false; + + if (!objc_is_object_id (ltyp) && !objc_is_class_id (ltyp) + && !TYPE_HAS_OBJC_INFO (ltyp)) + return false; + + if (!objc_is_object_id (rtyp) && !objc_is_class_id (rtyp) + && !TYPE_HAS_OBJC_INFO (rtyp)) + 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. */ + if (argno != -5) + { + if ((!lproto && objc_is_object_id (ltyp)) + || (!rproto && objc_is_object_id (rtyp))) + 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)) + 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); +#endif +} + +/* Recursively copy inheritance information rooted at BINFO. To do this, + we emulate the song and dance performed by cp/tree.c: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.c:xref_basetypes(). */ + +static void +objc_xref_basetypes (tree ref, tree basetype) +{ + tree binfo = make_tree_binfo (basetype ? 1 : 0); + + TYPE_BINFO (ref) = binfo; + BINFO_OFFSET (binfo) = size_zero_node; + BINFO_TYPE (binfo) = ref; + + if (basetype) + { + tree base_binfo = objc_copy_binfo (TYPE_BINFO (basetype)); + + BINFO_INHERITANCE_CHAIN (base_binfo) = binfo; + BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, 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 ("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; + enum debug_info_type 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_class_type = build_pointer_type (objc_class_reference); + + objc_object_name = get_identifier (OBJECT_TYPEDEF_NAME); + objc_class_name = get_identifier (CLASS_TYPEDEF_NAME); + + /* Declare the 'id' and 'Class' typedefs. */ + type = lang_hooks.decls.pushdecl (build_decl (input_location, + TYPE_DECL, + objc_object_name, + objc_object_type)); + TREE_NO_WARNING (type) = 1; + + type = lang_hooks.decls.pushdecl (build_decl (input_location, + TYPE_DECL, + objc_class_name, + objc_class_type)); + TREE_NO_WARNING (type) = 1; + + /* Forward-declare '@interface Protocol'. */ + type = get_identifier (PROTOCOL_OBJECT_CLASS_NAME); + objc_declare_class (tree_cons (NULL_TREE, type, NULL_TREE)); + 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 (tree_cons (NULL_TREE, constant_string_id, NULL_TREE)); + + /* 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 (void_type_node, + tree_cons (NULL_TREE, 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); +} + +static hashval_t +string_hash (const void *ptr) +{ + const_tree const str = ((const struct string_descriptor *)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; +} + +static int +string_eq (const void *ptr1, const void *ptr2) +{ + const_tree const str1 = ((const struct string_descriptor *)ptr1)->literal; + const_tree const str2 = ((const struct string_descriptor *)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; + void **loc; + + /* 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; + loc = htab_find_slot (string_htab, &key, INSERT); + desc = (struct string_descriptor *) *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. */ + +tree +objc_build_constructor (tree type, VEC(constructor_elt,gc) *elts) +{ + tree constructor = build_constructor (type, elts); + + TREE_CONSTANT (constructor) = 1; + TREE_STATIC (constructor) = 1; + TREE_READONLY (constructor) = 1; + +#ifdef OBJCPLUS + /* Adjust for impedance mismatch. We should figure out how to build + CONSTRUCTORs that consistently please both the C and C++ gods. */ + if (!VEC_index (constructor_elt, 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 (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 + hash_class_name_enter (als_name_hash_list, alias_ident, + underlying_class); + } +} + +void +objc_declare_class (tree ident_list) +{ + tree list; +#ifdef OBJCPLUS + if (current_namespace != global_namespace) { + error ("Objective-C declarations may only appear in global scope"); + } +#endif /* OBJCPLUS */ + + for (list = ident_list; list; list = TREE_CHAIN (list)) + { + tree ident = TREE_VALUE (list); + + if (! objc_is_class_name (ident)) + { + tree record = lookup_name (ident), 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", + ident); + error ("previous declaration of %q+D", + record); + } + } + + record = xref_tag (RECORD_TYPE, ident); + 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) = ident; + hash_class_name_enter (cls_name_hash_list, ident, NULL_TREE); + } + } +} + +tree +objc_is_class_name (tree ident) +{ + hash target; + + if (ident && TREE_CODE (ident) == IDENTIFIER_NODE + && identifier_global_value (ident)) + ident = identifier_global_value (ident); + 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; + + target = hash_class_name_lookup (cls_name_hash_list, ident); + if (target) + return target->key; + + target = hash_class_name_lookup (als_name_hash_list, ident); + if (target) + { + gcc_assert (target->list && target->list->value); + return target->list->value; + } + + return 0; +} + +/* Check whether TYPE is either 'id' or 'Class'. */ + +tree +objc_is_id (tree type) +{ + if (type && TREE_CODE (type) == IDENTIFIER_NODE + && identifier_global_value (type)) + type = identifier_global_value (type); + + 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))); + + assemble_external (func); + 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)); + + assemble_external (objc_assign_global_decl); + 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)); + + assemble_external (objc_assign_strong_cast_decl); + 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; +} + +struct GTY(()) interface_tuple { + tree id; + tree class_name; +}; + +static GTY ((param_is (struct interface_tuple))) htab_t interface_htab; + +static hashval_t +hash_interface (const void *p) +{ + const struct interface_tuple *d = (const struct interface_tuple *) p; + return IDENTIFIER_HASH_VALUE (d->id); +} + +static int +eq_interface (const void *p1, const void *p2) +{ + const struct interface_tuple *d = (const struct interface_tuple *) p1; + return d->id == p2; +} + +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; + + { + struct interface_tuple **slot; + tree i = NULL_TREE; + + if (interface_htab) + { + slot = (struct interface_tuple **) + htab_find_slot_with_hash (interface_htab, ident, + IDENTIFIER_HASH_VALUE (ident), + NO_INSERT); + if (slot && *slot) + i = (*slot)->class_name; + } + return i; + } +} + +/* 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; +} + +/* Called when checking the variables in a struct. If we are not + doing the ivars list inside an @interface context, then returns + fieldlist unchanged. Else, returns the list of class ivars. +*/ +tree +objc_get_interface_ivars (tree fieldlist) +{ + if (!objc_collecting_ivars || !objc_interface_context + || TREE_CODE (objc_interface_context) != CLASS_INTERFACE_TYPE + || CLASS_SUPER_NAME (objc_interface_context) == NULL_TREE) + return fieldlist; + + return get_class_ivars (objc_interface_context, 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 can not 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; + } +} + +/* Begin code generation for protocols... */ + +static tree +objc_method_parm_type (tree type) +{ + type = TREE_VALUE (TREE_TYPE (type)); + if (TREE_CODE (type) == TYPE_DECL) + type = TREE_TYPE (type); + return type; +} + +static int +objc_encoded_type_size (tree type) +{ + int sz = int_size_in_bytes (type); + + /* Make all integer and enum types at least as large + as an int. */ + if (sz > 0 && INTEGRAL_TYPE_P (type)) + sz = MAX (sz, int_size_in_bytes (integer_type_node)); + /* Treat arrays as pointers, since that's how they're + passed in. */ + else if (TREE_CODE (type) == ARRAY_TYPE) + sz = int_size_in_bytes (ptr_type_node); + return sz; +} + +/* Encode a method prototype. + + The format is described in gcc/doc/objc.texi, section 'Method + signatures'. + */ + +tree +encode_method_prototype (tree method_decl) +{ + tree parms; + int parm_offset, i; + char buf[40]; + tree result; + + /* ONEWAY and BYCOPY, for remote object are the only method qualifiers. */ + encode_type_qualifiers (TREE_PURPOSE (TREE_TYPE (method_decl))); + + /* Encode return type. */ + encode_type (objc_method_parm_type (method_decl), + obstack_object_size (&util_obstack), + OBJC_ENCODE_INLINE_DEFS); + + /* Stack size. */ + /* The first two arguments (self and _cmd) are pointers; account for + their size. */ + i = int_size_in_bytes (ptr_type_node); + parm_offset = 2 * i; + for (parms = METHOD_SEL_ARGS (method_decl); parms; + parms = DECL_CHAIN (parms)) + { + tree type = objc_method_parm_type (parms); + int sz = objc_encoded_type_size (type); + + /* If a type size is not known, bail out. */ + if (sz < 0) + { + error_at (DECL_SOURCE_LOCATION (method_decl), + "type %qT does not have a known size", + type); + /* Pretend that the encoding succeeded; the compilation will + fail nevertheless. */ + goto finish_encoding; + } + parm_offset += sz; + } + + sprintf (buf, "%d@0:%d", parm_offset, i); + obstack_grow (&util_obstack, buf, strlen (buf)); + + /* Argument types. */ + parm_offset = 2 * i; + for (parms = METHOD_SEL_ARGS (method_decl); parms; + parms = DECL_CHAIN (parms)) + { + tree type = objc_method_parm_type (parms); + + /* Process argument qualifiers for user supplied arguments. */ + encode_type_qualifiers (TREE_PURPOSE (TREE_TYPE (parms))); + + /* Type. */ + encode_type (type, obstack_object_size (&util_obstack), + OBJC_ENCODE_INLINE_DEFS); + + /* Compute offset. */ + sprintf (buf, "%d", parm_offset); + parm_offset += objc_encoded_type_size (type); + + obstack_grow (&util_obstack, buf, strlen (buf)); + } + + finish_encoding: + obstack_1grow (&util_obstack, '\0'); + result = get_identifier (XOBFINISH (&util_obstack, char *)); + obstack_free (&util_obstack, util_firstobj); + return result; +} + +/* 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); + 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) + || !tree_int_cst_equal (DECL_INITIAL (intdecls), + DECL_INITIAL (impdecls))) + { + 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_mark_needed_node (cgraph_node (METHOD_DEFINITION (chain))); + chain = DECL_CHAIN (chain); + } + + chain = CLASS_NST_METHODS (impent->imp_context); + while (chain) + { + cgraph_mark_needed_node (cgraph_node (METHOD_DEFINITION (chain))); + 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 ("can not 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 (buf); +} + +/* 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 ("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 + && TREE_INT_CST_HIGH (number) == 0) + { + TREE_VALUE (second_argument) + = build_int_cst (integer_type_node, + TREE_INT_CST_LOW (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 + && TREE_INT_CST_HIGH (number) == 0 + && TREE_INT_CST_LOW (number) != 0) + { + TREE_VALUE (third_argument) + = build_int_cst (integer_type_node, + TREE_INT_CST_LOW (number) + 2); + } + } + 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 + (TREE_VALUE (saved_type), get_arg_type_list (*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; +} + +/* Used by `build_objc_method_call' and `comp_proto_with_proto'. Return + an argument list for method METH. CONTEXT is either METHOD_DEF or + METHOD_REF, saying whether we are trying to define a method or call + one. SUPERFLAG says this is for 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 METH is null, user-defined + arguments (i.e., beyond self and _cmd) shall be represented by `...'. */ + +tree +get_arg_type_list (tree meth, int context, int superflag) +{ + tree arglist, akey; + + /* Receiver & _cmd types are runtime-dependent. */ + arglist = (*runtime.get_arg_type_list_base) (meth, context, superflag); + + /* No actual method prototype given -- assume that remaining arguments + are `...'. */ + if (!meth) + return arglist; + + /* Build a list of argument types. */ + for (akey = METHOD_SEL_ARGS (meth); akey; akey = DECL_CHAIN (akey)) + { + tree arg_type = TREE_VALUE (TREE_TYPE (akey)); + + /* Decay argument types for the underlying C function as appropriate. */ + arg_type = objc_decay_parm_type (arg_type); + + chainon (arglist, build_tree_list (NULL_TREE, arg_type)); + } + + if (METHOD_ADD_ARGS (meth)) + { + for (akey = TREE_CHAIN (METHOD_ADD_ARGS (meth)); + akey; akey = TREE_CHAIN (akey)) + { + tree arg_type = TREE_TYPE (TREE_VALUE (akey)); + + arg_type = objc_decay_parm_type (arg_type); + + chainon (arglist, build_tree_list (NULL_TREE, arg_type)); + } + + if (!METHOD_ADD_ARGS_ELLIPSIS_P (meth)) + goto lack_of_ellipsis; + } + else + { + lack_of_ellipsis: + chainon (arglist, OBJC_VOID_AT_END); + } + + return arglist; +} + +static tree +check_duplicates (hash hsh, int methods, int is_class) +{ + tree meth = NULL_TREE; + + if (hsh) + { + meth = hsh->key; + + if (hsh->list) + { + /* We have two or more methods with the same name but + different types. */ + attr loop; + + /* 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 (loop = hsh->list; loop; loop = loop->next) + if (!comp_proto_with_proto (meth, loop->value, 0)) + goto issue_warning; + + return meth; + } + + issue_warning: + if (methods) + { + bool type = TREE_CODE (meth) == INSTANCE_METHOD_DECL; + + warning_at (input_location, 0, + "multiple methods named %<%c%E%> found", + (is_class ? '+' : '-'), + METHOD_SEL_NAME (meth)); + inform (DECL_SOURCE_LOCATION (meth), "using %<%c%s%>", + (type ? '-' : '+'), + identifier_to_locale (gen_method_decl (meth))); + } + else + { + bool type = TREE_CODE (meth) == INSTANCE_METHOD_DECL; + + warning_at (input_location, 0, + "multiple selectors named %<%c%E%> found", + (is_class ? '+' : '-'), + METHOD_SEL_NAME (meth)); + inform (DECL_SOURCE_LOCATION (meth), "found %<%c%s%>", + (type ? '-' : '+'), + identifier_to_locale (gen_method_decl (meth))); + } + + for (loop = hsh->list; loop; loop = loop->next) + { + bool type = TREE_CODE (loop->value) == INSTANCE_METHOD_DECL; + + inform (DECL_SOURCE_LOCATION (loop->value), "also found %<%c%s%>", + (type ? '-' : '+'), + identifier_to_locale (gen_method_decl (loop->value))); + } + } + } + return meth; +} + +/* 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. */ + 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 mess) +{ + tree receiver = TREE_PURPOSE (mess); + tree sel_name; +#ifdef OBJCPLUS + tree args = TREE_PURPOSE (TREE_VALUE (mess)); +#else + tree args = TREE_VALUE (mess); +#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 (TREE_VALUE (mess))); +#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 (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) +{ + hash method_prototype = NULL; + + if (!is_class) + method_prototype = hash_lookup (nst_method_hash_list, + sel_name); + + if (!method_prototype) + { + method_prototype = hash_lookup (cls_method_hash_list, + sel_name); + is_class = 1; + } + + 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.c) after RECEIVER and METHOD_PARAMS have been expanded. + + If the DEPRECATED_METHOD_PROTOTYPE argument is NULL, then we warn + if the method being used is deprecated. If it is not NULL, instead + of deprecating, we set *DEPRECATED_METHOD_PROTOTYPE 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 *deprecated_method_prototype) +{ + tree method_prototype = NULL_TREE, rprotos = NULL_TREE, rtype; + tree retval, class_tree; + int self, super, have_cast; + + /* 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 = (rtype == self_decl); + super = (rtype == UOBJC_SUPER_decl); + rtype = TREE_TYPE (receiver); + + 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 = 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) + rtype = lookup_interface (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 receiver is of type `id' or `Class' (or if the @interface for a + class is not visible), we shall be satisfied with the existence of + any instance or class method. */ + if (objc_is_id (rtype)) + { + class_tree = (IS_CLASS (rtype) ? objc_class_name : NULL_TREE); + rprotos = (TYPE_HAS_OBJC_INFO (TREE_TYPE (rtype)) + ? TYPE_OBJC_PROTOCOL_LIST (TREE_TYPE (rtype)) + : NULL_TREE); + rtype = NULL_TREE; + + 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) + { + 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 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. */ + if (!rtype || TREE_CODE (rtype) == IDENTIFIER_NODE) + { + rtype = NULL_TREE; + /* We could not find an @interface declaration, yet Message maybe in a + @class's protocol. */ + if (!method_prototype && rprotos) + method_prototype + = lookup_method_in_protocol_list (rprotos, sel_name, 0); + } + else if (TREE_CODE (rtype) == CLASS_INTERFACE_TYPE + || TREE_CODE (rtype) == CLASS_IMPLEMENTATION_TYPE) + { + /* We have a valid ObjC class name. 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 + { + 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; + } + } + + + /* 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"); + warning_at (input_location, + 0, "will be assumed to return %<id%> and accept"); + warning_at (input_location, + 0, "%<...%> 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_DEPRECATED (method_prototype) && rtype != NULL_TREE) + { + if (deprecated_method_prototype) + *deprecated_method_prototype = 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. */ + hash hsh; + + /* First try with instance methods. */ + hsh = hash_lookup (nst_method_hash_list, selname); + + /* If not found, try with class methods. */ + if (!hsh) + { + hsh = hash_lookup (cls_method_hash_list, selname); + } + + /* If still not found, print out a warning. */ + if (!hsh) + { + 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); +} + +/* This is used to implement @encode(). See gcc/doc/objc.texi, + section '@encode'. */ +tree +objc_build_encode_expr (tree type) +{ + tree result; + const char *string; + + encode_type (type, obstack_object_size (&util_obstack), + OBJC_ENCODE_INLINE_DEFS); + obstack_1grow (&util_obstack, 0); /* null terminate string */ + string = XOBFINISH (&util_obstack, const char *); + + /* Synthesize a string that represents the encoded struct/union. */ + result = my_build_string (strlen (string) + 1, string); + obstack_free (&util_obstack, util_firstobj); + return result; +} + +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); +} + +/* Compute a hash value for a given method SEL_NAME. */ + +static size_t +hash_func (tree sel_name) +{ + const unsigned char *s + = (const unsigned char *)IDENTIFIER_POINTER (sel_name); + size_t h = 0; + + while (*s) + h = h * 67 + *s++ - 113; + return h; +} + +static void +hash_init (void) +{ + nst_method_hash_list = ggc_alloc_cleared_vec_hash (SIZEHASHTABLE); + cls_method_hash_list = ggc_alloc_cleared_vec_hash (SIZEHASHTABLE); + + cls_name_hash_list = ggc_alloc_cleared_vec_hash (SIZEHASHTABLE); + als_name_hash_list = ggc_alloc_cleared_vec_hash (SIZEHASHTABLE); + + ivar_offset_hash_list = ggc_alloc_cleared_vec_hash (SIZEHASHTABLE); + + /* Initialize the hash table used to hold the constant string objects. */ + string_htab = htab_create_ggc (31, string_hash, + string_eq, NULL); +} + +/* This routine adds sel_name to the hash list. sel_name is a class or alias + name for the class. If alias name, then value is its underlying class. + If class, the value is NULL_TREE. */ + +static void +hash_class_name_enter (hash *hashlist, tree sel_name, tree value) +{ + hash obj; + int slot = hash_func (sel_name) % SIZEHASHTABLE; + + obj = ggc_alloc_hashed_entry (); + if (value != NULL_TREE) + { + /* Save the underlying class for the 'alias' in the hash table */ + attr obj_attr = ggc_alloc_hashed_attribute (); + obj_attr->value = value; + obj->list = obj_attr; + } + else + obj->list = 0; + obj->next = hashlist[slot]; + obj->key = sel_name; + + hashlist[slot] = obj; /* append to front */ + +} + +/* + Searches in the hash table looking for a match for class or alias name. +*/ + +static hash +hash_class_name_lookup (hash *hashlist, tree sel_name) +{ + hash target; + + target = hashlist[hash_func (sel_name) % SIZEHASHTABLE]; + + while (target) + { + if (sel_name == target->key) + return target; + + target = target->next; + } + return 0; +} + +/* WARNING!!!! hash_enter is called with a method, and will peek + inside to find its selector! But hash_lookup is given a selector + directly, and looks for the selector that's inside the found + entry's key (method) for comparison. */ + +static void +hash_enter (hash *hashlist, tree method) +{ + hash obj; + int slot = hash_func (METHOD_SEL_NAME (method)) % SIZEHASHTABLE; + + obj = ggc_alloc_hashed_entry (); + obj->list = 0; + obj->next = hashlist[slot]; + obj->key = method; + + hashlist[slot] = obj; /* append to front */ +} + +static hash +hash_lookup (hash *hashlist, tree sel_name) +{ + hash target; + + target = hashlist[hash_func (sel_name) % SIZEHASHTABLE]; + + while (target) + { + if (sel_name == METHOD_SEL_NAME (target->key)) + return target; + + target = target->next; + } + return 0; +} + +static void +hash_add_attr (hash entry, tree value) +{ + attr obj; + + obj = ggc_alloc_hashed_attribute (); + obj->next = entry->list; + obj->value = value; + + entry->list = obj; /* append to front */ +} + +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 behaviour 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; + } +} + +/* Add the method to the hash list if it doesn't contain an identical + method already. */ + +static void +add_method_to_hash_list (hash *hash_list, tree method) +{ + hash hsh; + + if (!(hsh = hash_lookup (hash_list, METHOD_SEL_NAME (method)))) + { + /* Install on a global chain. */ + hash_enter (hash_list, method); + } + else + { + /* Check types against those; if different, add to a list. */ + attr loop; + int already_there = comp_proto_with_proto (method, hsh->key, 1); + for (loop = hsh->list; !already_there && loop; loop = loop->next) + already_there |= comp_proto_with_proto (method, loop->value, 1); + if (!already_there) + hash_add_attr (hsh, method); + } +} + +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) + add_method_to_hash_list (cls_method_hash_list, method); + else + { + add_method_to_hash_list (nst_method_hash_list, 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)) + add_method_to_hash_list (cls_method_hash_list, method); + } + + return method; +} + +static tree +add_class (tree class_name, tree name) +{ + struct interface_tuple **slot; + + /* Put interfaces on list in reverse order. */ + TREE_CHAIN (class_name) = interface_chain; + interface_chain = class_name; + + if (interface_htab == NULL) + interface_htab = htab_create_ggc (31, hash_interface, eq_interface, NULL); + slot = (struct interface_tuple **) + htab_find_slot_with_hash (interface_htab, name, + IDENTIFIER_HASH_VALUE (name), + INSERT); + if (!*slot) + { + *slot = ggc_alloc_cleared_interface_tuple (); + (*slot)->id = name; + } + (*slot)->class_name = class_name; + + return interface_chain; +} + +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 + +/* 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); + const char *ivar_name = DECL_NAME (field_decl) + ? identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (field_decl))) + : _("<unnamed>"); + +#ifdef OBJCPLUS + if (TREE_CODE (field_type) == REFERENCE_TYPE) + { + error ("illegal reference type specified for instance variable %qs", + ivar_name); + /* 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", ivar_name); + /* 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", ivar_name); + /* 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, ivar_name); + /* 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))); +} + +/* 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 = is_ivar (get_class_ivars (klass, true), 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_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_class (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); + } + 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_class (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' and (undocumented) 'objc_exception' + attributes. */ + 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 + /* 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_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_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); + break; + } + 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; + break; + } + default: + return error_mark_node; + } +} + +/* This routine builds name of the setter synthesized function. */ +static 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); + 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, + "can not 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 /* 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); + + 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, + "can not 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 /* 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%> can not 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); + 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; + + strcpy (setter_name, full_setter_name); + 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); + 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 (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_protocols (tree names, tree attributes) +{ + tree list; + bool deprecated = 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 + warning (OPT_Wattributes, "%qE attribute directive ignored", name); + } + } + + for (list = names; list; list = TREE_CHAIN (list)) + { + tree name = TREE_VALUE (list); + + 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) + { + TYPE_ATTRIBUTES (protocol) = attributes; + if (deprecated) + TREE_DEPRECATED (protocol) = 1; + } + } + } +} + +static tree +start_protocol (enum tree_code code, tree name, tree list, tree attributes) +{ + tree protocol; + bool deprecated = 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 + 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; + } + + 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_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 parm_info = objc_parmlist; + objc_parmlist = NULL_TREE; + + return parm_info; +} +#else +struct c_arg_info * +objc_get_parm_info (int have_ellipsis) +{ + 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); + 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. */ + +static void +start_method_def (tree method) +{ + 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); + + 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) +{ + /* The following test is needed in case there are hashing + collisions. */ + if (METHOD_SEL_NAME (proto1) != METHOD_SEL_NAME (proto2)) + return 0; + + return match_proto_with_proto (proto1, proto2, strict); +} + +static int +match_proto_with_proto (tree proto1, tree proto2, int strict) +{ + tree type1, type2; + + /* 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. */ + for (type1 = get_arg_type_list (proto1, METHOD_REF, 0), + type2 = get_arg_type_list (proto2, METHOD_REF, 0); + type1 && type2; + type1 = TREE_CHAIN (type1), type2 = TREE_CHAIN (type2)) + { + if (!objc_types_are_equivalent (TREE_VALUE (type1), TREE_VALUE (type2)) + && (strict + || !objc_types_share_size_and_alignment (TREE_VALUE (type1), + TREE_VALUE (type2)))) + return 0; + } + + return (!type1 && !type2); +} + +/* 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; + + /* 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); + + 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; + + return false; +} + +/* Fold an OBJ_TYPE_REF expression for ObjC method dispatches, where + this occurs. ObjC method dispatches are _not_ like C++ virtual + member function dispatches, and we account for the difference here. */ +tree +#ifdef OBJCPLUS +objc_fold_obj_type_ref (tree ref, tree known_type) +#else +objc_fold_obj_type_ref (tree ref ATTRIBUTE_UNUSED, + tree known_type ATTRIBUTE_UNUSED) +#endif +{ +#ifdef OBJCPLUS + tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type)); + + /* If the receiver does not have virtual member functions, there + is nothing we can (or need to) do here. */ + if (!v) + return NULL_TREE; + + /* Let C++ handle C++ virtual functions. */ + return cp_fold_obj_type_ref (ref, known_type); +#else + /* For plain ObjC, we currently do not need to do anything. */ + return NULL_TREE; +#endif +} + +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 (ret_type, + get_arg_type_list (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 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))); + } + + if (DECL_INITIAL (decl) + && TREE_CODE (DECL_INITIAL (decl)) == INTEGER_CST) + sprintf (errbuf + strlen (errbuf), ": " HOST_WIDE_INT_PRINT_DEC, + TREE_INT_CST_LOW (DECL_INITIAL (decl))); + } + + 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))); + break; + + /* 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)); + break; + /* 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)); + break; + default: + return NULL; + break; + } +} + +/* 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; + + /* 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 + { + warning (0, "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, size_zero_node); + } + + 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; + } + + if (PROPERTY_REF_DEPRECATED_GETTER (*expr_p)) + { + /* 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_assert (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.c. */ + + /* type object; */ + /* Done by c-parser.c. */ + + /* 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.c */ +} + +/* --- 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) + && !strncmp (IDENTIFIER_POINTER (tmv), "NSString", 8)); +} + +/* 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)) +{ +} + +/* --- Encode --- */ +/* "Encode" a data type into a string, which grows in util_obstack. + + The format is described in gcc/doc/objc.texi, section 'Type + encoding'. + + Most of the encode_xxx functions have a 'type' argument, which is + the type to encode, and an integer 'curtype' argument, which is the + index in the encoding string of the beginning of the encoding of + the current type, and allows you to find what characters have + already been written for the current type (they are the ones in the + current encoding string starting from 'curtype'). + + For example, if we are encoding a method which returns 'int' and + takes a 'char **' argument, then when we get to the point of + encoding the 'char **' argument, the encoded string already + contains 'i12@0:4' (assuming a pointer size of 4 bytes). So, + 'curtype' will be set to 7 when starting to encode 'char **'. + During the whole of the encoding of 'char **', 'curtype' will be + fixed at 7, so the routine encoding the second pointer can find out + that it's actually encoding a pointer to a pointer by looking + backwards at what has already been encoded for the current type, + and seeing there is a "^" (meaning a pointer) in there. +*/ + + +/* Encode type qualifiers encodes one of the "PQ" Objective-C + keywords, ie 'in', 'out', 'inout', 'bycopy', 'byref', 'oneway'. + 'const', instead, is encoded directly as part of the type. + */ + +static void +encode_type_qualifiers (tree declspecs) +{ + tree spec; + + for (spec = declspecs; spec; spec = TREE_CHAIN (spec)) + { + /* FIXME: Shouldn't we use token->keyword here ? */ + if (ridpointers[(int) RID_IN] == TREE_VALUE (spec)) + obstack_1grow (&util_obstack, 'n'); + else if (ridpointers[(int) RID_INOUT] == TREE_VALUE (spec)) + obstack_1grow (&util_obstack, 'N'); + else if (ridpointers[(int) RID_OUT] == TREE_VALUE (spec)) + obstack_1grow (&util_obstack, 'o'); + else if (ridpointers[(int) RID_BYCOPY] == TREE_VALUE (spec)) + obstack_1grow (&util_obstack, 'O'); + else if (ridpointers[(int) RID_BYREF] == TREE_VALUE (spec)) + obstack_1grow (&util_obstack, 'R'); + else if (ridpointers[(int) RID_ONEWAY] == TREE_VALUE (spec)) + obstack_1grow (&util_obstack, 'V'); + else + gcc_unreachable (); + } +} + +/* Determine if a pointee is marked read-only. Only used by the NeXT + runtime to be compatible with gcc-3.3. */ + +static bool +pointee_is_readonly (tree pointee) +{ + while (POINTER_TYPE_P (pointee)) + pointee = TREE_TYPE (pointee); + + return TYPE_READONLY (pointee); +} + +/* Encode a pointer type. */ + +static void +encode_pointer (tree type, int curtype, int format) +{ + tree pointer_to = TREE_TYPE (type); + + if (flag_next_runtime) + { + /* This code is used to be compatible with gcc-3.3. */ + /* For historical/compatibility reasons, the read-only qualifier + of the pointee gets emitted _before_ the '^'. The read-only + qualifier of the pointer itself gets ignored, _unless_ we are + looking at a typedef! Also, do not emit the 'r' for anything + but the outermost type! */ + if (!generating_instance_variables + && (obstack_object_size (&util_obstack) - curtype <= 1) + && (TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL + ? TYPE_READONLY (type) + : pointee_is_readonly (pointer_to))) + obstack_1grow (&util_obstack, 'r'); + } + + if (TREE_CODE (pointer_to) == RECORD_TYPE) + { + if (OBJC_TYPE_NAME (pointer_to) + && TREE_CODE (OBJC_TYPE_NAME (pointer_to)) == IDENTIFIER_NODE) + { + const char *name = IDENTIFIER_POINTER (OBJC_TYPE_NAME (pointer_to)); + + if (strcmp (name, TAG_OBJECT) == 0) /* '@' */ + { + obstack_1grow (&util_obstack, '@'); + return; + } + else if (TYPE_HAS_OBJC_INFO (pointer_to) + && TYPE_OBJC_INTERFACE (pointer_to)) + { + if (generating_instance_variables) + { + obstack_1grow (&util_obstack, '@'); + obstack_1grow (&util_obstack, '"'); + obstack_grow (&util_obstack, name, strlen (name)); + obstack_1grow (&util_obstack, '"'); + return; + } + else + { + obstack_1grow (&util_obstack, '@'); + return; + } + } + else if (strcmp (name, TAG_CLASS) == 0) /* '#' */ + { + obstack_1grow (&util_obstack, '#'); + return; + } + else if (strcmp (name, TAG_SELECTOR) == 0) /* ':' */ + { + obstack_1grow (&util_obstack, ':'); + return; + } + } + } + else if (TREE_CODE (pointer_to) == INTEGER_TYPE + && TYPE_MODE (pointer_to) == QImode) + { + tree pname = TREE_CODE (OBJC_TYPE_NAME (pointer_to)) == IDENTIFIER_NODE + ? OBJC_TYPE_NAME (pointer_to) + : DECL_NAME (OBJC_TYPE_NAME (pointer_to)); + + /* (BOOL *) are an exception and are encoded as ^c, while all + other pointers to char are encoded as *. */ + if (strcmp (IDENTIFIER_POINTER (pname), "BOOL")) + { + if (!flag_next_runtime) + { + /* The NeXT runtime adds the 'r' before getting here. */ + + /* It appears that "r*" means "const char *" rather than + "char *const". "char *const" is encoded as "*", + which is identical to "char *", so the "const" is + unfortunately lost. */ + if (TYPE_READONLY (pointer_to)) + obstack_1grow (&util_obstack, 'r'); + } + + obstack_1grow (&util_obstack, '*'); + return; + } + } + + /* We have a normal pointer type that does not get special treatment. */ + obstack_1grow (&util_obstack, '^'); + encode_type (pointer_to, curtype, format); +} + +static void +encode_array (tree type, int curtype, int format) +{ + tree an_int_cst = TYPE_SIZE (type); + tree array_of = TREE_TYPE (type); + char buffer[40]; + + if (an_int_cst == NULL) + { + /* We are trying to encode an incomplete array. An incomplete + array is forbidden as part of an instance variable; but it + may occur if the instance variable is a pointer to such an + array. */ + + /* So the only case in which an incomplete array could occur + (without being pointed to) is if we are encoding the + arguments or return value of a method. In that case, an + incomplete array argument or return value (eg, + -(void)display: (char[])string) is treated like a pointer + because that is how the compiler does the function call. A + special, more complicated case, is when the incomplete array + is the last member of a struct (eg, if we are encoding + "struct { unsigned long int a;double b[];}"), which is again + part of a method argument/return value. In that case, we + really need to communicate to the runtime that there is an + incomplete array (not a pointer!) there. So, we detect that + special case and encode it as a zero-length array. + + Try to detect that we are part of a struct. We do this by + searching for '=' in the type encoding for the current type. + NB: This hack assumes that you can't use '=' as part of a C + identifier. + */ + { + char *enc = obstack_base (&util_obstack) + curtype; + if (memchr (enc, '=', + obstack_object_size (&util_obstack) - curtype) == NULL) + { + /* We are not inside a struct. Encode the array as a + pointer. */ + encode_pointer (type, curtype, format); + return; + } + } + + /* Else, we are in a struct, and we encode it as a zero-length + array. */ + sprintf (buffer, "[" HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)0); + } + else if (TREE_INT_CST_LOW (TYPE_SIZE (array_of)) == 0) + sprintf (buffer, "[" HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)0); + else + sprintf (buffer, "[" HOST_WIDE_INT_PRINT_DEC, + TREE_INT_CST_LOW (an_int_cst) + / TREE_INT_CST_LOW (TYPE_SIZE (array_of))); + + obstack_grow (&util_obstack, buffer, strlen (buffer)); + encode_type (array_of, curtype, format); + obstack_1grow (&util_obstack, ']'); + return; +} + +/* Encode a vector. The vector type is a GCC extension to C. */ +static void +encode_vector (tree type, int curtype, int format) +{ + tree vector_of = TREE_TYPE (type); + char buffer[40]; + + /* Vectors are like simple fixed-size arrays. */ + + /* Output ![xx,yy,<code>] where xx is the vector_size, yy is the + alignment of the vector, and <code> is the base type. Eg, int + __attribute__ ((vector_size (16))) gets encoded as ![16,32,i] + assuming that the alignment is 32 bytes. We include size and + alignment in bytes so that the runtime does not have to have any + knowledge of the actual types. + */ + sprintf (buffer, "![" HOST_WIDE_INT_PRINT_DEC ",%d", + /* We want to compute the equivalent of sizeof (<vector>). + Code inspired by c_sizeof_or_alignof_type. */ + ((TREE_INT_CST_LOW (TYPE_SIZE_UNIT (type)) + / (TYPE_PRECISION (char_type_node) / BITS_PER_UNIT))), + /* We want to compute the equivalent of __alignof__ + (<vector>). Code inspired by + c_sizeof_or_alignof_type. */ + TYPE_ALIGN_UNIT (type)); + obstack_grow (&util_obstack, buffer, strlen (buffer)); + encode_type (vector_of, curtype, format); + obstack_1grow (&util_obstack, ']'); + return; +} + +static void +encode_aggregate_fields (tree type, bool pointed_to, int curtype, int format) +{ + tree field = TYPE_FIELDS (type); + + for (; field; field = DECL_CHAIN (field)) + { +#ifdef OBJCPLUS + /* C++ static members, and things that are not field at all, + should not appear in the encoding. */ + if (TREE_CODE (field) != FIELD_DECL || TREE_STATIC (field)) + continue; +#endif + + /* Recursively encode fields of embedded base classes. */ + if (DECL_ARTIFICIAL (field) && !DECL_NAME (field) + && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE) + { + encode_aggregate_fields (TREE_TYPE (field), + pointed_to, curtype, format); + continue; + } + + if (generating_instance_variables && !pointed_to) + { + tree fname = DECL_NAME (field); + + obstack_1grow (&util_obstack, '"'); + + if (fname && TREE_CODE (fname) == IDENTIFIER_NODE) + obstack_grow (&util_obstack, + IDENTIFIER_POINTER (fname), + strlen (IDENTIFIER_POINTER (fname))); + + obstack_1grow (&util_obstack, '"'); + } + + encode_field_decl (field, curtype, format); + } +} + +static void +encode_aggregate_within (tree type, int curtype, int format, int left, + int right) +{ + tree name; + /* NB: aggregates that are pointed to have slightly different encoding + rules in that you never encode the names of instance variables. */ + int ob_size = obstack_object_size (&util_obstack); + bool inline_contents = false; + bool pointed_to = false; + + if (flag_next_runtime) + { + if (ob_size > 0 && *(obstack_next_free (&util_obstack) - 1) == '^') + pointed_to = true; + + if ((format == OBJC_ENCODE_INLINE_DEFS || generating_instance_variables) + && (!pointed_to || ob_size - curtype == 1 + || (ob_size - curtype == 2 + && *(obstack_next_free (&util_obstack) - 2) == 'r'))) + inline_contents = true; + } + else + { + /* c0 and c1 are the last two characters in the encoding of the + current type; if the last two characters were '^' or '^r', + then we are encoding an aggregate that is "pointed to". The + comment above applies: in that case we should avoid encoding + the names of instance variables. + */ + char c1 = ob_size > 1 ? *(obstack_next_free (&util_obstack) - 2) : 0; + char c0 = ob_size > 0 ? *(obstack_next_free (&util_obstack) - 1) : 0; + + if (c0 == '^' || (c1 == '^' && c0 == 'r')) + pointed_to = true; + + if (format == OBJC_ENCODE_INLINE_DEFS || generating_instance_variables) + { + if (!pointed_to) + inline_contents = true; + else + { + /* Note that the check (ob_size - curtype < 2) prevents + infinite recursion when encoding a structure which is + a linked list (eg, struct node { struct node *next; + }). Each time we follow a pointer, we add one + character to ob_size, and curtype is fixed, so after + at most two pointers we stop inlining contents and + break the loop. + + The other case where we don't inline is "^r", which + is a pointer to a constant struct. + */ + if ((ob_size - curtype <= 2) && !(c0 == 'r')) + inline_contents = true; + } + } + } + + /* Traverse struct aliases; it is important to get the + original struct and its tag name (if any). */ + type = TYPE_MAIN_VARIANT (type); + name = OBJC_TYPE_NAME (type); + /* Open parenth/bracket. */ + obstack_1grow (&util_obstack, left); + + /* Encode the struct/union tag name, or '?' if a tag was + not provided. Typedef aliases do not qualify. */ +#ifdef OBJCPLUS + /* For compatibility with the NeXT runtime, ObjC++ encodes template + args as a composite struct tag name. */ + if (name && TREE_CODE (name) == IDENTIFIER_NODE + /* Did this struct have a tag? */ + && !TYPE_WAS_ANONYMOUS (type)) + obstack_grow (&util_obstack, + decl_as_string (type, TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME), + strlen (decl_as_string (type, TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME))); +#else + if (name && TREE_CODE (name) == IDENTIFIER_NODE) + obstack_grow (&util_obstack, + IDENTIFIER_POINTER (name), + strlen (IDENTIFIER_POINTER (name))); +#endif + else + obstack_1grow (&util_obstack, '?'); + + /* Encode the types (and possibly names) of the inner fields, + if required. */ + if (inline_contents) + { + obstack_1grow (&util_obstack, '='); + encode_aggregate_fields (type, pointed_to, curtype, format); + } + /* Close parenth/bracket. */ + obstack_1grow (&util_obstack, right); +} + +/* Encode a bitfield NeXT-style (i.e., without a bit offset or the underlying + field type. */ + +static void +encode_next_bitfield (int width) +{ + char buffer[40]; + sprintf (buffer, "b%d", width); + obstack_grow (&util_obstack, buffer, strlen (buffer)); +} + +/* Encodes 'type', ignoring type qualifiers (which you should encode + beforehand if needed) with the exception of 'const', which is + encoded by encode_type. See above for the explanation of + 'curtype'. 'format' can be OBJC_ENCODE_INLINE_DEFS or + OBJC_ENCODE_DONT_INLINE_DEFS. +*/ +static void +encode_type (tree type, int curtype, int format) +{ + enum tree_code code = TREE_CODE (type); + + /* Ignore type qualifiers other than 'const' when encoding a + type. */ + + if (type == error_mark_node) + return; + + if (!flag_next_runtime) + { + if (TYPE_READONLY (type)) + obstack_1grow (&util_obstack, 'r'); + } + + switch (code) + { + case ENUMERAL_TYPE: + if (flag_next_runtime) + { + /* Kludge for backwards-compatibility with gcc-3.3: enums + are always encoded as 'i' no matter what type they + actually are (!). */ + obstack_1grow (&util_obstack, 'i'); + break; + } + /* Else, they are encoded exactly like the integer type that is + used by the compiler to store them. */ + case INTEGER_TYPE: + { + char c; + switch (GET_MODE_BITSIZE (TYPE_MODE (type))) + { + case 8: c = TYPE_UNSIGNED (type) ? 'C' : 'c'; break; + case 16: c = TYPE_UNSIGNED (type) ? 'S' : 's'; break; + case 32: + { + tree int_type = type; + if (flag_next_runtime) + { + /* Another legacy kludge for compatiblity with + gcc-3.3: 32-bit longs are encoded as 'l' or 'L', + but not always. For typedefs, we need to use 'i' + or 'I' instead if encoding a struct field, or a + pointer! */ + int_type = ((!generating_instance_variables + && (obstack_object_size (&util_obstack) + == (unsigned) curtype)) + ? TYPE_MAIN_VARIANT (type) + : type); + } + if (int_type == long_unsigned_type_node + || int_type == long_integer_type_node) + c = TYPE_UNSIGNED (type) ? 'L' : 'l'; + else + c = TYPE_UNSIGNED (type) ? 'I' : 'i'; + } + break; + case 64: c = TYPE_UNSIGNED (type) ? 'Q' : 'q'; break; + case 128: c = TYPE_UNSIGNED (type) ? 'T' : 't'; break; + default: gcc_unreachable (); + } + obstack_1grow (&util_obstack, c); + break; + } + case REAL_TYPE: + { + char c; + /* Floating point types. */ + switch (GET_MODE_BITSIZE (TYPE_MODE (type))) + { + case 32: c = 'f'; break; + case 64: c = 'd'; break; + case 96: + case 128: c = 'D'; break; + default: gcc_unreachable (); + } + obstack_1grow (&util_obstack, c); + break; + } + case VOID_TYPE: + obstack_1grow (&util_obstack, 'v'); + break; + + case BOOLEAN_TYPE: + obstack_1grow (&util_obstack, 'B'); + break; + + case ARRAY_TYPE: + encode_array (type, curtype, format); + break; + + case POINTER_TYPE: +#ifdef OBJCPLUS + case REFERENCE_TYPE: +#endif + encode_pointer (type, curtype, format); + break; + + case RECORD_TYPE: + encode_aggregate_within (type, curtype, format, '{', '}'); + break; + + case UNION_TYPE: + encode_aggregate_within (type, curtype, format, '(', ')'); + break; + + case FUNCTION_TYPE: /* '?' means an unknown type. */ + obstack_1grow (&util_obstack, '?'); + break; + + case COMPLEX_TYPE: + /* A complex is encoded as 'j' followed by the inner type (eg, + "_Complex int" is encoded as 'ji'). */ + obstack_1grow (&util_obstack, 'j'); + encode_type (TREE_TYPE (type), curtype, format); + break; + + case VECTOR_TYPE: + encode_vector (type, curtype, format); + break; + + default: + warning (0, "unknown type %s found during Objective-C encoding", + gen_type_name (type)); + obstack_1grow (&util_obstack, '?'); + break; + } + + if (flag_next_runtime) + { + /* Super-kludge. Some ObjC qualifier and type combinations need + to be rearranged for compatibility with gcc-3.3. */ + if (code == POINTER_TYPE && obstack_object_size (&util_obstack) >= 3) + { + char *enc = obstack_base (&util_obstack) + curtype; + + /* Rewrite "in const" from "nr" to "rn". */ + if (curtype >= 1 && !strncmp (enc - 1, "nr", 2)) + strncpy (enc - 1, "rn", 2); + } + } +} + +static void +encode_gnu_bitfield (int position, tree type, int size) +{ + enum tree_code code = TREE_CODE (type); + char buffer[40]; + char charType = '?'; + + /* This code is only executed for the GNU runtime, so we can ignore + the NeXT runtime kludge of always encoding enums as 'i' no matter + what integers they actually are. */ + if (code == INTEGER_TYPE || code == ENUMERAL_TYPE) + { + if (integer_zerop (TYPE_MIN_VALUE (type))) + /* Unsigned integer types. */ + { + switch (TYPE_MODE (type)) + { + case QImode: + charType = 'C'; break; + case HImode: + charType = 'S'; break; + case SImode: + { + if (type == long_unsigned_type_node) + charType = 'L'; + else + charType = 'I'; + break; + } + case DImode: + charType = 'Q'; break; + default: + gcc_unreachable (); + } + } + else + /* Signed integer types. */ + { + switch (TYPE_MODE (type)) + { + case QImode: + charType = 'c'; break; + case HImode: + charType = 's'; break; + case SImode: + { + if (type == long_integer_type_node) + charType = 'l'; + else + charType = 'i'; + break; + } + case DImode: + charType = 'q'; break; + default: + gcc_unreachable (); + } + } + } + else + { + /* Do not do any encoding, produce an error and keep going. */ + error ("trying to encode non-integer type as a bitfield"); + return; + } + + sprintf (buffer, "b%d%c%d", position, charType, size); + obstack_grow (&util_obstack, buffer, strlen (buffer)); +} + +void +encode_field_decl (tree field_decl, int curtype, int format) +{ +#ifdef OBJCPLUS + /* C++ static members, and things that are not fields at all, + should not appear in the encoding. */ + if (TREE_CODE (field_decl) != FIELD_DECL || TREE_STATIC (field_decl)) + return; +#endif + + /* Generate the bitfield typing information, if needed. Note the difference + between GNU and NeXT runtimes. */ + if (DECL_BIT_FIELD_TYPE (field_decl)) + { + int size = tree_low_cst (DECL_SIZE (field_decl), 1); + + if (flag_next_runtime) + encode_next_bitfield (size); + else + encode_gnu_bitfield (int_bit_position (field_decl), + DECL_BIT_FIELD_TYPE (field_decl), size); + } + else + encode_type (TREE_TYPE (field_decl), curtype, format); +} + +/* This routine encodes the attribute of the input PROPERTY according + to following formula: + + Property attributes are stored as a comma-delimited C string. + Simple attributes such as readonly are encoded as single + character. The parametrized attributes, getter=name and + setter=name, are encoded as a single character followed by an + identifier. Property types are also encoded as a parametrized + attribute. The characters used to encode these attributes are + defined by the following enumeration: + + enum PropertyAttributes { + kPropertyReadOnly = 'R', + kPropertyBycopy = 'C', + kPropertyByref = '&', + kPropertyDynamic = 'D', + kPropertyGetter = 'G', + kPropertySetter = 'S', + kPropertyInstanceVariable = 'V', + kPropertyType = 'T', + kPropertyWeak = 'W', + kPropertyStrong = 'P', + kPropertyNonAtomic = 'N' + }; */ +tree +objc_v2_encode_prop_attr (tree property) +{ + const char *string; + tree type = TREE_TYPE (property); + + obstack_1grow (&util_obstack, 'T'); + encode_type (type, obstack_object_size (&util_obstack), + OBJC_ENCODE_INLINE_DEFS); + + if (PROPERTY_READONLY (property)) + obstack_grow (&util_obstack, ",R", 2); + + switch (PROPERTY_ASSIGN_SEMANTICS (property)) + { + case OBJC_PROPERTY_COPY: + obstack_grow (&util_obstack, ",C", 2); + break; + case OBJC_PROPERTY_RETAIN: + obstack_grow (&util_obstack, ",&", 2); + break; + case OBJC_PROPERTY_ASSIGN: + default: + break; + } + + if (PROPERTY_DYNAMIC (property)) + obstack_grow (&util_obstack, ",D", 2); + + if (PROPERTY_NONATOMIC (property)) + obstack_grow (&util_obstack, ",N", 2); + + /* Here we want to encode the getter name, but only if it's not the + standard one. */ + if (PROPERTY_GETTER_NAME (property) != PROPERTY_NAME (property)) + { + obstack_grow (&util_obstack, ",G", 2); + string = IDENTIFIER_POINTER (PROPERTY_GETTER_NAME (property)); + obstack_grow (&util_obstack, string, strlen (string)); + } + + if (!PROPERTY_READONLY (property)) + { + /* Here we want to encode the setter name, but only if it's not + the standard one. */ + tree standard_setter = get_identifier (objc_build_property_setter_name (PROPERTY_NAME (property))); + if (PROPERTY_SETTER_NAME (property) != standard_setter) + { + obstack_grow (&util_obstack, ",S", 2); + string = IDENTIFIER_POINTER (PROPERTY_SETTER_NAME (property)); + obstack_grow (&util_obstack, string, strlen (string)); + } + } + + /* TODO: Encode strong ('P'), weak ('W') for garbage collection. */ + + if (!PROPERTY_DYNAMIC (property)) + { + obstack_grow (&util_obstack, ",V", 2); + if (PROPERTY_IVAR_NAME (property)) + string = IDENTIFIER_POINTER (PROPERTY_IVAR_NAME (property)); + else + string = IDENTIFIER_POINTER (PROPERTY_NAME (property)); + obstack_grow (&util_obstack, string, strlen (string)); + } + + /* NULL-terminate string. */ + obstack_1grow (&util_obstack, 0); + string = XOBFINISH (&util_obstack, char *); + obstack_free (&util_obstack, util_firstobj); + return get_identifier (string); +} + +#include "gt-objc-objc-act.h" |