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Darwin 0.1 In-kernel Objective-C runtime

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 *	objc-runtime.h
 *	Copyright 1988, NeXT, Inc.
 */

#ifndef _OBJC_RUNTIME_H_
#define _OBJC_RUNTIME_H_

#import "objc.h"
#import "objc-class.h"
#import "hashtable.h"
#import "Object.h"

typedef struct objc_symtab *Symtab;

struct objc_symtab {
	unsigned long 	sel_ref_cnt;
	SEL 		*refs;		
	unsigned short 	cls_def_cnt;
	unsigned short 	cat_def_cnt;
	void  		*defs[1];	/* variable size */
};

typedef struct objc_module *Module;

struct objc_module {
	unsigned long	version;
	unsigned long	size;
	const char	*name;
	Symtab 		symtab;	
};

struct objc_super {
	id receiver;
	Class class;
};

/* kernel operations */

extern id objc_getClass(const char *name);
extern id objc_getMetaClass(const char *name);
extern id objc_msgSend(id self, SEL op, ...);
extern id objc_msgSendSuper(struct objc_super *super, SEL op, ...);

/* forwarding operations */

extern id objc_msgSendv(id self, SEL op, unsigned arg_size, marg_list arg_frame);

/* 
   iterating over all the classes in the application...
  
   NXHashTable *class_hash = objc_getClasses();
   NXHashState state = NXInitHashState(class_hash);
   Class class;
  
   while (NXNextHashState(class_hash, &state, &class)
     ...;
 */
extern NXHashTable *objc_getClasses();
extern Module *objc_getModules();
extern id objc_lookUpClass(const char *name);
extern void objc_addClass(Class myClass);

/* customizing the error handling for objc_getClass/objc_getMetaClass */

extern void objc_setClassHandler(int (*)(const char *));

/* Making the Objective-C runtime thread safe. */
extern void objc_setMultithreaded (BOOL flag);

/* overriding the default object allocation and error handling routines */

extern id	(*_alloc)(Class, unsigned int);
extern id	(*_copy)(Object *, unsigned int);
extern id	(*_realloc)(Object *, unsigned int);
extern id	(*_dealloc)(Object *);
extern id	(*_zoneAlloc)(Class, unsigned int, NXZone *);
extern id	(*_zoneRealloc)(Object *, unsigned int, NXZone *);
extern id	(*_zoneCopy)(Object *, unsigned int, NXZone *);
extern void	(*_error)(Object *, const char *, va_list);

#endif /* _OBJC_RUNTIME_H_ */

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