freeseg.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 164 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "dll.h"        // needs to be first
#include "variety.h"
#include <stddef.h>
#include "rtdata.h"
#include "crwd.h"
#if defined(__QNX__)
    #include <sys/seginfo.h>
#elif defined(__OS2__)
    #include <dos.h>
    #define INCL_DOSMEMMGR
    #include <wos2.h>
    #include "tinyos2.h"
    #if defined(__BIG_DATA__)
        #define MODIFIES ds es
    #else
        #define MODIFIES es
    #endif
#elif defined(__WINDOWS_286__)
    #include <dos.h>
    #include "windows.h"
    #define MODIFIES es
#else
    #include <dos.h>
    #include "tinyio.h"
#endif
#include "heap.h"
#include "seterrno.h"

#if defined(__WINDOWS_286__) || defined(__OS2__)

#pragma aux DoFreeSeg modify [MODIFIES]
static int DoFreeSeg( __segment seg )
{
    #if defined(__WINDOWS_286__)
        HANDLE hmem;

        hmem = (HANDLE)GlobalHandle( seg );
        if( hmem == NULL ) {
            return( -1 );
        }
        GlobalUnlock( hmem );
        if( GlobalFree( hmem ) == hmem ) {
            return( -1 );
        }
        return( 0 );
    #else
        return( DosFreeSeg( seg ) );
    #endif
}

extern int tricky_free_seg( int, int );
#if defined(__OS2__) && defined(__BIG_DATA__)
#pragma aux tricky_free_seg = \
        "mov    cx,es"          \
        "cmp    cx,ax"          \
        "jl     L1"             \
        "cmp    cx,bx"          \
        "jg     L1"             \
        "xor    cx,cx"          \
        "L1:"                   \
        "mov    dx,ds"          \
        "cmp    dx,ax"          \
        "jl     L2"             \
        "cmp    dx,bx"          \
        "jg     L2"             \
        "xor    dx,dx"          \
        "L2:"                   \
        "call   DoFreeSeg"      \
        "mov    es,cx"          \
        "mov    ds,dx"          \
        parm [ax] [bx] value [ax] modify [cx dx]
#else
#pragma aux tricky_free_seg = \
        "mov    cx,es"          \
        "cmp    cx,ax"          \
        "jl     L1"             \
        "cmp    cx,bx"          \
        "jg     L1"             \
        "xor    cx,cx"          \
        "L1:"                   \
        "call   DoFreeSeg"      \
        "mov    es,cx"          \
        parm [ax] [bx] value [ax] modify [cx]
#endif

#pragma aux __DoFreeSeg modify [MODIFIES]
int __DoFreeSeg(__segment first)
{
        __segment     last;
        long          segments;
        unsigned long size;
#ifdef __OS2__
        DosSizeSeg(first, &size);
#else
        size = GlobalSize((HGLOBAL)first);
#endif
        segments = (size + 65535L) >> 16;
        last = first + (__segment)((segments - 1L) << _RWD_HShift);

        return (tricky_free_seg(first, last));
}
#endif


#if defined(__WINDOWS_286__) || defined(__OS2__)
#pragma aux __FreeSeg modify [MODIFIES]
#endif
int __FreeSeg( __segment seg )
{
    #if defined(__QNX__)
        if( qnx_segment_free( seg ) == -1 ) {
            return( -1 );
        }
    #elif defined(__WINDOWS_286__)
        if( __DoFreeSeg( seg ) ) {
            return( -1 );
        }
    #else
        tiny_ret_t rc;

        #if defined(__OS2__)
            rc = __DoFreeSeg( seg );
        #else
            rc = TinyFreeBlock( seg );
        #endif
        if( TINY_ERROR( rc ) ) {
            return( __set_errno_dos( TINY_INFO( rc ) ) );
        }
    #endif
    return( 0 );
}