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Annotation of objc/cplus_init.c, 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: #ifndef KERNEL
        !            26: #ifdef SHLIB
        !            27: #include "shlib.h"
        !            28: #endif
        !            29: 
        !            30: #include <libc.h>
        !            31: #include <stdlib.h>
        !            32: #include <mach-o/loader.h>
        !            33: 
        !            34: static void call_constructors (void);
        !            35: static void call_destructors (void);
        !            36: static void call_routines_for_section (const struct mach_header **headers,
        !            37:                                       const char *segment_name,
        !            38:                                       const char *section_name);
        !            39: 
        !            40: /* Perform C++ initialization.  This only works for the MH_EXECUTE and
        !            41:    MH_FVMLIB formats, since the headers must be mapped.
        !            42:    
        !            43:    crt0.o uses the trick of declaring a common symbol with the same name
        !            44:    as this function to call this routine if it is linked in for some other
        !            45:    reason, but without forcing it to be linked in itself. */
        !            46: 
        !            47: void _cplus_init (void)
        !            48: {
        !            49:   /* Each module which contains constructors or destructors should
        !            50:      contain an undefined reference to these symbols to ensure that
        !            51:      this initialization routine is linked in. */
        !            52:   asm (".globl .constructors_used");
        !            53:   asm (".constructors_used = 0");
        !            54:   asm (".globl .destructors_used");
        !            55:   asm (".destructors_used = 0");
        !            56:   
        !            57:   atexit (&call_destructors);
        !            58:   call_constructors ();
        !            59: }
        !            60: 
        !            61: 
        !            62: /* Call the appropriate contructor for each static object in the program. */
        !            63: 
        !            64: static void call_constructors (void)
        !            65: {
        !            66:   const struct mach_header **headers = getmachheaders ();
        !            67: 
        !            68:   call_routines_for_section (headers, "__TEXT", "__constructor");
        !            69:   free (headers);
        !            70: }
        !            71: 
        !            72: 
        !            73: /* Call the appropriate destructor for each static object in the program. */
        !            74: 
        !            75: static void call_destructors (void)
        !            76: {
        !            77:   const struct mach_header **headers = getmachheaders ();
        !            78: 
        !            79:   call_routines_for_section (getmachheaders (), "__TEXT", "__destructor");
        !            80:   free (headers);
        !            81: }
        !            82: 
        !            83: 
        !            84: /* Call the init functions in the specified section of each header.
        !            85:    The section is assumed to contain a sequential list of function pointers.
        !            86:    The functions are called with no arguments, and no return value is
        !            87:    expected. */
        !            88: 
        !            89: static void call_routines_for_section (const struct mach_header **headers,
        !            90:                                       const char *segment_name,
        !            91:                                       const char *section_name)
        !            92: {
        !            93:   unsigned int i;
        !            94:   
        !            95:   if (headers == NULL)
        !            96:     return;
        !            97:   
        !            98:   for (i = 0; headers[i] != NULL; i++)
        !            99:     {
        !           100:       const struct section *section;
        !           101:       void (**init_routines) (void);
        !           102:       unsigned int n, j;
        !           103:       
        !           104:       section = getsectbynamefromheader (headers[i],
        !           105:                                         segment_name,
        !           106:                                         section_name);
        !           107:       
        !           108:       if (section == NULL)
        !           109:         continue;
        !           110:       
        !           111:       init_routines = (void (**) (void)) section->addr;
        !           112:       n = section->size / sizeof (init_routines[0]);
        !           113:       
        !           114:       for (j = 0; j < n; j++)
        !           115:        (*init_routines[j]) ();
        !           116:     }
        !           117: }
        !           118: 
        !           119: #endif /* KERNEL */

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