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objc
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objc.h
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1994-02-15
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/* Basic data types for Objective C.
Copyright (C) 1993 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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 2, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* As a special exception, if you link this library with files
compiled with GCC to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */
#ifndef __objc_INCLUDE_GNU
#define __objc_INCLUDE_GNU
#ifdef __cplusplus
extern "C" {
#endif
#ifdef IN_GCC
#include "gstddef.h"
#else
#include "stddef.h"
#endif
/*
** Definition of the boolean type.
*/
typedef char BOOL;
#define YES (BOOL)1
#define NO (BOOL)0
/*
** Definition of a selector. Selectors are really of type unsigned int.
** The runtime does this mapping from SEL's to names internally in the
** sel_... operations. You should never use the fact that it is actually
** an integer, since other Objective-C implementations use other conventions.
*/
typedef void* SEL;
/*
** ObjC uses this typedef for untyped instances.
*/
typedef struct objc_object {
struct objc_class* class_pointer;
} *id;
/*
** Definition of method type. When retrieving the implementation of a
** method, this is type of the pointer returned
*/
typedef id (*IMP)(id, SEL, ...);
/*
** More simple types...
*/
#define nil (id)0 /* id of Nil instance */
#define Nil (Class*)0 /* id of Nil class */
typedef char *STR; /* String alias */
/*
** The compiler generates one of these structures for each class.
**
** This structure is the definition for classes.
**
** This structure is generated by the compiler in the executable and used by
** the run-time during normal messaging operations. Therefore some members
** change type. The compiler generates "char* const" and places a string in
** the following member variables: super_class.
*/
typedef struct objc_class MetaClass;
typedef struct objc_class Class;
struct objc_class {
MetaClass* class_pointer; /* Pointer to the class's
meta class. */
struct objc_class* super_class; /* Pointer to the super
class. NULL for class
Object. */
const char* name; /* Name of the class. */
long version; /* Unknown. */
unsigned long info; /* Bit mask. See class masks
defined above. */
long instance_size; /* Size in bytes of the class.
The sum of the class definition
and all super class
definitions. */
struct objc_ivar_list* ivars; /* Pointer to a structure that
describes the instance
variables in the class
definition. NULL indicates
no instance variables. Does
not include super class
variables. */
struct objc_method_list* methods; /* Linked list of instance
methods defined for the
class. */
struct sarray * dtable; /* Pointer to instance
method dispatch table. */
struct objc_class* subclass_list; /* Subclasses */
struct objc_class* sibling_class;
struct objc_protocol_list *protocols; /* Protocols conformed to */
};
#ifndef __OBJC__
typedef struct objc_protocol {
struct objc_class* class_pointer;
char *protocol_name;
struct objc_protocol_list *protocol_list;
struct objc_method_description_list *instance_methods, *class_methods;
} Protocol;
#else /* __OBJC__ */
@class Protocol;
#endif
typedef void* retval_t; /* return value */
typedef void(*apply_t)(void); /* function pointer */
typedef union {
char *arg_ptr;
char arg_regs[sizeof (char*)];
} *arglist_t; /* argument frame */
#if defined(__OBJC__)
#include "objc/sarray.h"
/*
This is the function called when messages are send to nil. You may
set a breakpoint in your debugger at this function to catch messages
too nil.
*/
extern id nil_method(id rcv, SEL op, ...);
/*
The messager is inlined, thus it is defined here directly. The
inlining is quite time-consuming when optimizing. This will be
taken care of later by hand-coding the messager in the compiler.
*/
extern __inline__ IMP
objc_msg_lookup(id receiver, SEL op)
{
if(receiver)
return sarray_get(receiver->class_pointer->dtable, (size_t)(op));
else
return nil_method;
}
#else
IMP objc_msg_lookup(id receiver, SEL op);
#endif
#ifdef __cplusplus
}
#endif
#endif /* not __objc_INCLUDE_GNU */