373 lines
17 KiB
C
373 lines
17 KiB
C
/* -*-c-*-
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* This file contains declarations used by the run-time system.
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*
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* Most of these declarations are defined by virtue of data
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* structures produced by the compiler.
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*
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* Copyright (C) 1991 Threaded Technologies Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 1, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should receive a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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$Header: /usr/user/dennis_glatting/ObjC/c-runtime/include/RCS/ObjC.h,v 0.3 1991/11/16 15:57:35 dennisg Exp dennisg $
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$Author: dennisg $
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$Date: 1991/11/16 15:57:35 $
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$Log: ObjC.h,v $
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* Revision 0.3 1991/11/16 15:57:35 dennisg
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* changed the defs for class structures for new implementation of run-time.
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* changed def of SEL back to its original type.
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*
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* Revision 0.2 1991/11/07 22:31:42 dennisg
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* added copyleft.
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*
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* Revision 0.1 1991/10/24 00:19:24 dennisg
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* Initial check in. Preliminary development stage.
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*
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*/
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#ifndef _objc_INCLUDE_GNU
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#define _objc_INCLUDE_GNU
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/* If someone is using a c++
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compiler then adjust the
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types in the file back
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to C. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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#include <hash.h>
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#define nil ( id )0 /* id of Nil instance */
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#define Nil ( Class_t )0 /* id of Nil class */
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typedef char* STR; /* String alias */
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/* Boolean typedefs */
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typedef char BOOL;
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#define YES (BOOL)1
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#define NO (BOOL)0
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/* Definition of a
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selector. Selectors are
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really of type char*. The
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run-time hashes the
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string's address to locate
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the method. If the method
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isn't in the hash table then
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a search is made through the
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class hierarchy using
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strcmp() to locate the
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method. */
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typedef struct objc_selector* SEL;
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/* ObjC uses this typedef
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for untyped instances. */
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typedef struct objc_object {
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struct objc_class* isa;
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} *id;
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/* Prototype for method
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functions. */
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typedef id ( *IMP )( id, SEL, ... );
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/* Filer types used to
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describe Ivars and
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Methods. */
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#define _C_ID '@'
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#define _C_CLASS '#'
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#define _C_SEL ':'
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#define _C_CHR 'c'
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#define _C_UCHR 'C'
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#define _C_SHT 's'
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#define _C_USHT 'S'
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#define _C_INT 'i'
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#define _C_UINT 'I'
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#define _C_LNG 'l'
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#define _C_ULNG 'L'
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#define _C_FLT 'f'
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#define _C_DBL 'd'
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#define _C_BFLD 'b'
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#define _C_VOID 'v'
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#define _C_UNDEF '?'
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#define _C_PTR '^'
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#define _C_CHARPTR '*'
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#define _C_ARY_B '['
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#define _C_ARY_E ']'
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#define _C_UNION_B '('
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#define _C_UNION_E ')'
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#define _C_STRUCT_B '{'
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#define _C_STRUCT_E '}'
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/*
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* These definitions are masks used with
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* the "info" member variable in the class and
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* meta class structures.
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*/
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#define CLS_CLASS 0x1L /* The structure is of type
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class (Class_t). */
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#define CLS_META 0x2L /* The structure is of type
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meta class (MetaClass_t). */
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#define CLS_INITIALIZED 0x4L /* Class is initialized. A
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+initialize method is the
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first message sent to a
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class. It isn't guaranteed
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to be sent only once. */
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#define CLS_POSING 0x8L /* Class is posing as
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another. */
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#define CLS_MAPPED 0x10L /* Unknown. */
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/* Set this variable to !0 to
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have the messager print
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messaging operations. */
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extern BOOL objc_trace;
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/*
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* Whereas a Module (defined further down) is the
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* root (typically) of a file, a Symtab is the root of the
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* class and category definitions within the module.
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*
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* A Symtab contains a variable length array of pointers
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* to classes and categories defined in the module.
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*/
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typedef struct objc_symtab {
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u_long sel_ref_cnt; /* Unknown. */
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SEL *refs; /* Unknown. */
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u_short cls_def_cnt; /* Number of classes compiled
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(defined) in the module. */
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u_short cat_def_cnt; /* Number of categories
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compiled (defined) in the
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module. */
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void *defs[1]; /* Variable array of pointers.
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cls_def_cnt of type Class_t
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followed by cat_def_cnt of
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type Category_t. */
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} Symtab, *Symtab_t;
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/*
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* The compiler generates one of these structures for each
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* module that composes the executable (eg main.m).
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*
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* This data structure is the root of the definition tree
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* for the module.
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*
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* A collect program runs between ld stages and creates
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* a ObjC ctor array. That array holds a pointer to each
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* module structure of the executable.
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*/
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typedef struct objc_module {
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u_long version; /* Compiler revision. */
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u_long size; /* sizeof(Module). */
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char* name; /* Name of the file where the
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module was generated. The
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name includes the path. */
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Symtab_t symtab; /* Pointer to the Symtab of
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the module. The Symtab
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holds an array of pointers to
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the classes and categories
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defined in the module. */
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} Module, *Module_t;
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/*
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* The compiler generates one of these structures for a
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* class that has instance variables defined in its
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* specification.
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*/
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typedef struct objc_ivar* Ivar_t;
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typedef struct objc_ivar_list {
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int ivar_count; /* Number of structures (Ivar)
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contained in the list. One
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structure per instance
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variable defined in the
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class. */
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struct objc_ivar {
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char* ivar_name; /* Name of the instance
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variable as entered in the
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class definition. */
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char* ivar_type; /* Description of the Ivar's
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type. Useful for
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debuggers. */
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int ivar_offset; /* Byte offset from the base
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address of the instance
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structure to the variable. */
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} ivar_list[1]; /* Variable length
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structure. */
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} IvarList, *IvarList_t;
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/*
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* The compiler generates one (or more) of these structures
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* for a class that has methods defined in its specification.
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*
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* The implementation of a class can be broken into separate
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* pieces in a file and categories can break them across modules.
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* To handle this problem is a singly linked list of methods.
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*/
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typedef struct objc_method Method;
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typedef Method* Method_t;
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typedef struct objc_method_list {
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struct objc_method_list* method_next; /* This variable is used to link
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a method list to another. It
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is a singly linked list. */
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int method_count; /* Number of methods defined in
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this structure. */
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struct objc_method {
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SEL method_name; /* This variable is the method's
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name. It is a char*.
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The unique integer passed to
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objc_msgSend() is a char* too.
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It is compared against
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method_name using strcmp(). */
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char* method_types; /* Description of the method's
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parameter list. Useful for
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debuggers. */
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IMP method_imp; /* Address of the method in the
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executable. */
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} method_list[1]; /* Variable length
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structure. */
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} MethodList, *MethodList_t;
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/*
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* The compiler generates one of these structures for
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* each class.
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*
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* This structure is the definition for meta classes.
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* By definition a meta class is the class's class. Its
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* most relevant contribution is that its method list
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* contain the class's factory methods.
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*
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* This structure is generated by the compiler in the
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* executable and used by the run-time during normal
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* messaging operations. Therefore some members
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* change type.
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* The compiler generates "char* const" and places a string
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* in the following member variables: isa and super_class.
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*/
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typedef struct objc_metaClass {
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struct objc_metaClass* isa; /* Pointer to Object meta
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class. */
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struct objc_metaClass* super_class; /* Pointer to meta class's
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super class. NULL for
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Object. */
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char* name; /* Name of the meta class. */
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long version; /* Unknown. */
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long info; /* Bit mask. See class masks
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defined above. */
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long instance_size; /* Always 0 except for Object.
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Should be ignored. */
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IvarList_t ivars; /* Always NULL except for
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Object. Should be ignored. */
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MethodList_t methods; /* Linked List of factory methods
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for the class. */
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Cache_t cache; /* Used to cache factory methods
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defined for the class and its
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super classes. Entries are
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made to the cache as the
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messager receives them. */
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} MetaClass, *MetaClass_t;
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/*
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* The compiler generates one of these structures for
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* each class.
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*
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* This structure is the definition for classes.
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*
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* This structure is generated by the compiler in the
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* executable and used by the run-time during normal
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* messaging operations. Therefore some members
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* change type.
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* The compiler generates "char* const" and places a string
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* in the following member variables: super_class.
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*/
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typedef struct objc_class {
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MetaClass_t isa; /* Pointer to the class's
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meta class. */
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struct objc_class* super_class; /* Pointer to the super
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class. NULL for class
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Object. */
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char* name; /* Name of the class. */
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long version; /* Unknown. */
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long info; /* Bit mask. See class masks
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defined above. */
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long instance_size; /* Size in bytes of the class.
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The sum of the class definition
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and all super class
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definitions. */
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IvarList_t ivars; /* Pointer to a structure that
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describes the instance
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variables in the class
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definition. NULL indicates
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no instance variables. Does
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not include super class
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variables. */
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MethodList_t methods; /* Linked list of instance
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methods defined for the
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class. */
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Cache_t cache; /* Used to cache instance methods
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defined for the class and its
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super classes. Entries are
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made to the cache as the
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messager receives them. */
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} Class, *Class_t;
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/*
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* The compiler generates one of these structures
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* for each category. A class may have many
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* categories and contain both instance and
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* factory methods.
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*/
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typedef struct objc_category {
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char* category_name; /* Name of the category. Name
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contained in the () of the
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category definition. */
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char* class_name; /* Name of the class to which
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the category belongs. */
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MethodList_t instance_methods; /* Linked list of instance
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methods defined in the
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category. NULL indicates no
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instance methods defined. */
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MethodList_t class_methods; /* Linked list of factory
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methods defined in the
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category. NULL indicates no
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class methods defined. */
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} Category, *Category_t;
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/*
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* Structure used when a message is send to a class's
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* super class. The compiler generates one of these
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* structures and passes it to objc_msgSuper().
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*/
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typedef struct objc_super {
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id receiver; /* Id of the object sending
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the message. */
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Class_t class; /* Object's super class. */
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} Super, *Super_t;
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#ifdef __cplusplus
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}
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#endif
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#endif
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