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* Makefile.in (WARN_CFLAGS): Add -Wwrite-strings. (tree.o): Depend on output.h. * c-decl.c (pending_invalid_xref_file, current_function_prototype_file): Constify. (pushdecl): Constify a local char *. (define_label): Constify filename parameter. * c-lex.c (init_parse): Constify parameter and return value. * c-typeck.c (c_expand_asm_operands): Constify filename parameter. * c-tree.h: Update prototypes. * c-parse.in: Constify filename member of %union, and if_stmt_file. * c-parse.y, c-parse.c, c-parse.h, objc/objc-parse.y, objc/objc-parse.c: Regenerate. * dwarfout.c (dwarfout_init): Constify main_input_filename parameter. * dwarfout.h: Update prototypes. * expr.c (expand_expr): Constify a local char *. * flags.h: Constify main_input_filename. * function.c (expand_function_end): Constify filename parameter. * genrecog.c (make_insn_sequence): Use a character array for c_test_pos. (main): Remove unused variables. * input.h: Constify input_filename, main_input_filename, and file_stack.name. Update prototypes. * output.h: Declare first_global_object_name and weak_global_object_name here, as const char *. * stmt.c (expand_asm_operands): Constify filename parameter. * toplev.c (compile_file, push_srcloc, debug_start_source_file): Constify filename parameter. (input_filename, main_input_filename): Constify. * toplev.h: Update prototypes. * tree.c: Include output.h. Don't declare first_global_object_name or weak_global_object_name. Clean up string bashing in get_file_function_name_long. * tree.h (struct tree_decl): Constify filename member. (input_filename): Constify. Update prototypes. * varasm.c (first_global_object_name, weak_global_object_name): Constify. (assemble_start_function, assemble_variable): Clean up string bashing. * gcc.c: Constify all spec-related strings initialized, transitively, from string constants. Constify all strings and string variables related to multilibs. (set_spec, read_specs): Cast argument to free to PTR. (used_arg): Do not modify multilib_matches. Use strncmp plus length comparison to compare multilib switches. * genmultilib: Constify everything declared in multilib.h. ch: * ch-tree.h: Update prototypes. Remove prototypes for functions declared elsewhere. * decl.c (define_label): Constify filename parameter. * grant.c (globalize_decl, set_default_grant_file): Constify local char * variables. Don't declare first_global_object_name or asm_out_file. * lang.c (chill_real_input_filename): Constify. * lex.c (init_parse): Constify parameter and return value. * parse.c: Don't declare input_filename. (ch_expand_asm_operands): Constify filename parameter. (parse_multi_dimension_case_action): Constify local char *. * satisfy.c (safe_satisfy_decl): Constify local char *. cp: * cp-tree.h: Constify tree_srcloc.filename, tinst_level.file, and pending_inline.filename. Update prototypes. * decl.c (define_label): Constify filename parameter. * decl2.c (warn_if_unknown_interface): Constify local char *. * input.c Constify input_source.filename. Don't declare input_filename or lineno. Constify filename parameter to feed_input. * lex.c (init_parse): Constify parameter and return value. (cp_pragma_interface, cp_pragma_implementation): Constify filename argument. (reinit_parse_for_method, reinit_parse_for_block, reinit_parse_for_expr, feed_defarg, handle_cp_pragma): Constify local char *. * pt.c: Don't declare lineno or input_filename. (print_template_context, tsubst_friend_function, tsubst_decl, tsubst, instantiate_decl): Constify local char *. * semantics.c (expand_body): Constify local char *. * tree.c (build_srcloc): Constify filename parameter. * typeck.c (c_expand_asm_operands): Constify filename parameter. f: * com.c (ffecom_subscript_check_): Constify array_name parameter. Clean up string bashing. (ffecom_arrayref_, ffecom_char_args_x_): Constify array_name parameter. (ffecom_do_entry_, ffecom_gen_sfuncdef_, ffecom_start_progunit_, ffecom_sym_transform_, ffecom_sym_transform_assign_): Constify local char *. (init_parse): Constify parameter and return value. * lex.c: Include dwarfout.h instead of prototyping dwarfout_* functions here. (ffelex_file_pop_, ffelex_file_push_): Constify filename parameter. (ffelex_hash_, ffelex_include_): Constify local char *. * std.c (ffestd_exec_end): Constify local char *. * where.c (ffewhere_file_new): Constify filename parameter. * where.h: Update prototypes. java: * check_init.c (check_init): Constify local char *. * class.c (push_class): Constify local char *. * java_tree.h: Update prototypes. * jcf-io.c (open_class): Constify filename parameter and return value. (find_class): Remove redundant string copy. Cast return from open_class. * jcf-parse.c (read_class, parse_class_file, yyparse): Constify local char *. * jcf-write.c (generate_bytecode_insns, generate_classfile): Constify local char *. * jcf.h (JCF): Constify filename and classname. (JCF_FINISH): Cast args to FREE to char * when appropriate. * lang.c (init_parse): Constify parameter and return value. * lex.c (java_get_line_col): Constify filename parameter. * parse.h: Constify parser_ctxt.filename. Update prototypes. * parse.y (java_parser_context_suspend, issue_warning_error_from_context, safe_layout_class): Constify local char *. * parse.c: Regenerate. From-SVN: r33804 |
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|---|---|---|
| .. | ||
| config-lang.in | ||
| lang-specs.h | ||
| Make-lang.in | ||
| Makefile.in | ||
| objc-act.c | ||
| objc-act.h | ||
| objc-parse.c | ||
| objc-parse.y | ||
| objc-tree.def | ||
| objc.gperf | ||
| README | ||
GNU Objective C notes ********************* This document is to explain what has been done, and a little about how specific features differ from other implementations. The runtime has been completely rewritten in gcc 2.4. The earlier runtime had several severe bugs and was rather incomplete. The compiler has had several new features added as well. This is not documentation for Objective C, it is usable to someone who knows Objective C from somewhere else. Runtime API functions ===================== The runtime is modeled after the NeXT Objective C runtime. That is, most functions have semantics as it is known from the NeXT. The names, however, have changed. All runtime API functions have names of lowercase letters and underscores as opposed to the `traditional' mixed case names. The runtime api functions are not documented as of now. Someone offered to write it, and did it, but we were not allowed to use it by his university (Very sad story). We have started writing the documentation over again. This will be announced in appropriate places when it becomes available. Protocols ========= Protocols are now fully supported. The semantics is exactly as on the NeXT. There is a flag to specify how protocols should be typechecked when adopted to classes. The normal typechecker requires that all methods in a given protocol must be implemented in the class that adopts it -- it is not enough to inherit them. The flag `-Wno-protocol' causes it to allow inherited methods, while `-Wprotocols' is the default which requires them defined. +initialize =========== This method, if defined, is called before any other instance or class methods of that particular class. This method is not inherited, and is thus not called as initializer for a subclass that doesn't define it itself. Thus, each +initialize method is called exactly once (or never if no methods of that particular class is never called). Besides this, it is allowed to have several +initialize methods, one for each category. The order in which these (multiple methods) are called is not well defined. I am not completely certain what the semantics of this method is for other implementations, but this is how it works for GNU Objective C. Passivation/Activation/Typedstreams =================================== This is supported in the style of NeXT TypedStream's. Consult the headerfile Typedstreams.h for api functions. I (Kresten) have rewritten it in Objective C, but this implementation is not part of 2.4, it is available from the GNU Objective C prerelease archive. There is one difference worth noting concerning objects stored with objc_write_object_reference (aka NXWriteObjectReference). When these are read back in, their object is not guaranteed to be available until the `-awake' method is called in the object that requests that object. To objc_read_object you must pass a pointer to an id, which is valid after exit from the function calling it (like e.g. an instance variable). In general, you should not use objects read in until the -awake method is called. Acknowledgements ================ The GNU Objective C team: Geoffrey Knauth <gsk@marble.com> (manager), Tom Wood <wood@next.com> (compiler) and Kresten Krab Thorup <krab@iesd.auc.dk> (runtime) would like to thank a some people for participating in the development of the present GNU Objective C. Paul Burchard <burchard@geom.umn.edu> and Andrew McCallum <mccallum@cs.rochester.edu> has been very helpful debugging the runtime. Eric Herring <herring@iesd.auc.dk> has been very helpful cleaning up after the documentation-copyright disaster and is now helping with the new documentation. Steve Naroff <snaroff@next.com> and Richard Stallman <rms@gnu.ai.mit.edu> has been very helpful with implementation details in the compiler. Bug Reports =========== Please read the section `Submitting Bugreports' of the gcc manual before you submit any bugs.