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Annotation of objc/objc-dispatch.h, revision 1.1.1.1

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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