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Annotation of objc/objc-dispatch.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.0 (the 'License').  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License."
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: /*
        !            25:  *     objc-dispatch.h
        !            26:  *     Copyright 1988, NeXT, Inc.
        !            27:  */
        !            28: 
        !            29: #ifndef _OBJC_DISPATCH_H_
        !            30: #define _OBJC_DISPATCH_H_
        !            31: 
        !            32: #import "objc.h"
        !            33: 
        !            34: #define GETFRAME(firstArg)     ((MSG)&(((MSG*)(&firstArg))[-2/*-3*/]))
        !            35: #define PREVSELF(firstArg)     (GETFRAME(firstArg)->next->_xxARGS.receiver)
        !            36: #define PREVSEL(firstArg)      (GETFRAME(firstArg)->next->_xxARGS.cmd)
        !            37: 
        !            38: /* Data-type alignment constants.  Usage is:  while(addr&alignment)addr++ */
        !            39: #define _A_CHAR                0x0
        !            40: #define _A_SHORT       0x1
        !            41: #define _A_INT         0x1
        !            42: #define _A_LONG                0x1
        !            43: #define _A_FLOAT       0x1
        !            44: #define _A_DOUBLE      0x1
        !            45: #define _A_POINTER     0x1
        !            46: #define NBITS_CHAR     8
        !            47: #define NBITS_INT      (sizeof(int)*NBITS_CHAR)
        !            48: 
        !            49: /* Stack Frame layouts */
        !            50: 
        !            51: typedef struct _MSG {                  /* Stack frame layout (for messages) */
        !            52:        struct _MSG *next;              /* Link to next frame */
        !            53:        /*void *saved_a1;                   GNU uses this for struct returns */
        !            54:        id (*ret)();                    /* Return address from subroutine */
        !            55:        struct _ARGFRAME {
        !            56:                id receiver;            /* ID of receiver */
        !            57:                char *cmd;              /* Message selector */
        !            58:                int arg;                /* First message argument */
        !            59:        } _xxARGS;
        !            60: } *MSG;
        !            61: 
        !            62: typedef struct _MSGSUPER {
        !            63:        struct _MSG *next;              /* Link to next frame */
        !            64:        /*void *saved_a1;                   GNU uses this for struct returns */
        !            65:        id (*ret)();                    /* Return address from subroutine */
        !            66:        struct {
        !            67:                struct objc_super *caller;
        !            68:                char *cmd;              /* Message selector */
        !            69:                int arg;                /* First message argument */
        !            70:        } _xxARGS;
        !            71: } *MSGSUPER;
        !            72: 
        !            73: #endif /* _OBJC_DISPATCH_H_ */

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