189 lines
5.9 KiB
Objective-C
189 lines
5.9 KiB
Objective-C
/* Basic data types for Objective C.
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Copyright (C) 1993 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC 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 by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: objc.h,v 1.2 1993/08/02 17:39:08 mycroft Exp $
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*/
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/* As a special exception, if you link this library with files
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compiled with GCC to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#ifndef __objc_INCLUDE_GNU
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#define __objc_INCLUDE_GNU
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef IN_GCC
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#include "gstddef.h"
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#else
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#include "stddef.h"
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#endif
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/*
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** Definition of the boolean type.
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*/
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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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/*
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** Definition of a selector. Selectors are really of type unsigned int.
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** The runtime does this mapping from SEL's to names internally in the
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** sel_... operations. You should never use the fact that it is actually
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** an integer, since other Objective-C implementations use other conventions.
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*/
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typedef void* SEL;
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/*
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** ObjC uses this typedef for untyped instances.
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*/
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typedef struct objc_object {
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struct objc_class* class_pointer;
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} *id;
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/*
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** Definition of method type. When retrieving the implementation of a
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** method, this is type of the pointer returned
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*/
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typedef id (*IMP)(id, SEL, ...);
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/*
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** More simple types...
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*/
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#define nil (id)0 /* id of Nil instance */
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#define Nil (Class*)0 /* id of Nil class */
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typedef char *STR; /* String alias */
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/*
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** The compiler generates one of these structures for 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 executable and used by
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** the run-time during normal messaging operations. Therefore some members
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** change type. The compiler generates "char* const" and places a string in
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** the following member variables: super_class.
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*/
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typedef struct objc_class MetaClass;
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typedef struct objc_class Class;
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struct objc_class {
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MetaClass* class_pointer; /* 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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const char* name; /* Name of the class. */
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long version; /* Unknown. */
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unsigned 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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struct objc_ivar_list* 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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struct objc_method_list* methods; /* Linked list of instance
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methods defined for the
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class. */
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struct sarray * dtable; /* Pointer to instance
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method dispatch table. */
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struct objc_class* subclass_list; /* Subclasses */
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struct objc_class* sibling_class;
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struct objc_protocol_list *protocols; /* Protocols conformed to */
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};
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#ifndef __OBJC__
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typedef struct objc_protocol {
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struct objc_class* class_pointer;
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char *protocol_name;
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struct objc_protocol_list *protocol_list;
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struct objc_method_description_list *instance_methods, *class_methods;
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} Protocol;
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#else
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@class Protocol;
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#endif
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typedef void* retval_t; /* return value */
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typedef void(*apply_t)(void); /* function pointer */
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#if defined(REG_ARGS) || defined(STACK_ARGS)
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typedef struct {
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char* arg_pointer;
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#ifdef STRUCT_RETURN
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void* struct_return;
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#endif
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#ifdef REG_ARGS
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void* regs[2];
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#endif
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} *arglist_t;
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#ifdef REG_ARGS
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#define __objc_frame_receiver(FRAME) (FRAME)->regs[0]
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#define __objc_frame_selector(FRAME) ((SEL)(FRAME)->regs[1])
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#else
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#define __objc_frame_receiver(FRAME) ((id*)(FRAME)->arg_pointer)[0]
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#define __objc_frame_selector(FRAME) ((SEL*)(FRAME)->arg_pointer)[1]
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#endif
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#else
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typedef void* arglist_t;
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#endif
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#if defined(__OBJC__)
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#include "objc/sarray.h"
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static id nil_method(id rcv, SEL op, ...) { return rcv; }
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extern __inline__ IMP
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objc_msg_lookup(id receiver, SEL op)
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{
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if(receiver)
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return sarray_get(receiver->class_pointer->dtable, (size_t) op);
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else
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return nil_method;
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}
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#else
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IMP objc_msg_lookup(id receiver, SEL op);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* not __objc_INCLUDE_GNU */
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