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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
-
- @class Protocol;
- #endif
-
- typedef void* retval_t; /* return value */
- typedef void(*apply_t)(void); /* function pointer */
-
- #if defined(REG_ARGS) || defined(STACK_ARGS)
-
- typedef struct {
- char* arg_pointer;
- #ifdef STRUCT_RETURN
- void* struct_return;
- #endif
- #ifdef REG_ARGS
- void* regs[2];
- #endif
- } *arglist_t;
-
- #ifdef REG_ARGS
- #define __objc_frame_receiver(FRAME) (FRAME)->regs[0]
- #define __objc_frame_selector(FRAME) ((SEL)(FRAME)->regs[1])
-
- #else
- #define __objc_frame_receiver(FRAME) ((id*)(FRAME)->arg_pointer)[0]
- #define __objc_frame_selector(FRAME) ((SEL*)(FRAME)->arg_pointer)[1]
- #endif
- #else
-
- typedef void* arglist_t;
-
- #endif
-
- #if defined(__OBJC__)
-
- #include "objc/sarray.h"
-
- static id nil_method(id rcv, SEL op, ...) { return rcv; }
-
- 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 */
-