cvmisc.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 251 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 <string.h>
#include "cvinfo.h"

/*
   Misc. stuff.
*/

const char      DIPImpName[] = "CodeView";

unsigned        DIPENTRY DIPImpQueryHandleSize( handle_kind hk )
{
    static unsigned_8 Sizes[] = {
        sizeof( imp_image_handle ),
        sizeof( imp_type_handle ),
        sizeof( imp_cue_handle ),
        sizeof( imp_sym_handle )
    };

    return( Sizes[ hk ] );
}

dip_status      DIPENTRY DIPImpMoreMem( unsigned size )
{
    size = size;
    return( (VMShrink() != 0) ? DS_OK : DS_FAIL );
}

dip_status      DIPENTRY DIPImpStartup(void)
{
    return( DS_OK );
}

void            DIPENTRY DIPImpShutdown( void )
{
}

void            DIPENTRY DIPImpCancel( void )
{
}

unsigned NameCopy( char *dst, const char *src, unsigned max, unsigned len )
{
    if( max > 0 ) {
        --max;
        if( max > len ) max = len;
        memcpy( dst, src, max );
        dst[ max ] = '\0';
    }
    return( len );
}

cv_directory_entry *FindDirEntry( imp_image_handle *ii, imp_mod_handle im,
                                unsigned subsection_type )
{
    unsigned            i;
    unsigned            block;
    unsigned            full_blocks;
    unsigned            remainder;
    cv_directory_entry  *p;

    full_blocks = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES ) - 1;
    for( block = 0; block < full_blocks; ++block ) {
        for( i = 0; i < DIRECTORY_BLOCK_ENTRIES; ++i ) {
            p = &ii->directory[block][i];
            if( p->subsection == subsection_type && p->iMod == im ) {
                return( p );
            }
        }
    }
    remainder = ii->dir_count - (full_blocks * DIRECTORY_BLOCK_ENTRIES);
    for( i = 0; i < remainder; ++i ) {
        p = &ii->directory[block][i];
        if( p->subsection == subsection_type && p->iMod == im ) {
            return( p );
        }
    }
    return( NULL );
}

walk_result WalkDirList( imp_image_handle *ii, DIR_WALKER *wk, void *d )
{
    unsigned            i;
    unsigned            block;
    unsigned            full_blocks;
    unsigned            remainder;
    walk_result         wr;
    cv_directory_entry  *p;

    full_blocks = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES ) - 1;
    for( block = 0; block < full_blocks; ++block ) {
        for( i = 0; i < DIRECTORY_BLOCK_ENTRIES; ++i ) {
            p = &ii->directory[block][i];
            wr = wk( ii, p, d );
            if( wr != WR_CONTINUE ) return( wr );
        }
    }
    remainder = ii->dir_count - (full_blocks * DIRECTORY_BLOCK_ENTRIES);
    for( i = 0; i < remainder; ++i ) {
        p = &ii->directory[block][i];
        wr = wk( ii, p, d );
        if( wr != WR_CONTINUE ) return( wr );
    }
    return( WR_CONTINUE );
}

static const struct {
    unsigned_8  k;
    unsigned_8  size;
} LeafInfo[] = {
    { TK_INTEGER,       1 },
    { TK_INTEGER,       2 },
    { TK_INTEGER,       2 },
    { TK_INTEGER,       4 },
    { TK_INTEGER,       4 },
    { TK_REAL,          4 },
    { TK_REAL,          8 },
    { TK_REAL,          10 },
    { TK_REAL,          16 },
    { TK_INTEGER,       8 },
    { TK_INTEGER,       8 },
    { TK_REAL,          6 },
    { TK_COMPLEX,       8 },
    { TK_COMPLEX,       16 },
    { TK_COMPLEX,       20 },
    { TK_COMPLEX,       32 },
    { TK_STRING,        0 },
};

void *GetNumLeaf( void *p, numeric_leaf *v )
{
    unsigned            key;

    key = *(unsigned_16 *)p;
    if( key < LF_NUMERIC ) {
        v->k = TK_INTEGER;
        v->size = sizeof( unsigned_16 );
        v->valp = p;
        v->int_val = key;
    } else {
        v->valp = (unsigned_8 *)p + sizeof( unsigned_16 );
        v->size = LeafInfo[ key - LF_NUMERIC ].size;
        v->k = LeafInfo[ key - LF_NUMERIC ].k;
        switch( key ) {
        case LF_CHAR:
            v->int_val = *(signed_8 *)v->valp;
            break;
        case LF_SHORT:
            v->int_val = *(signed_16 *)v->valp;
            break;
        case LF_USHORT:
            v->int_val = *(unsigned_16 *)v->valp;
            break;
        case LF_LONG:
        case LF_ULONG:
            v->int_val = *(unsigned_32 *)v->valp;
            break;
        case LF_VARSTRING:
            v->size = *(unsigned_16 *)v->valp;
            v->valp = (unsigned_8 *)v->valp + sizeof( unsigned_16 );
            break;
        }
    }
    return( (unsigned_8 *)v->valp + v->size );
}


dip_status DoIndirection( imp_image_handle *ii, type_info *ti,
                        location_context *lc, location_list *ll )
{
    union {
        unsigned_8      u8;
        unsigned_16     u16;
        unsigned_32     u32;
        addr32_off      ao32;
        addr48_off      ao48;
        addr32_ptr      ap32;
        addr48_ptr      ap48;
    }                   tmp;
    location_list       dst;
    dip_status          ds;

    ii = ii;
    LocationCreate( &dst, LT_INTERNAL, &tmp );
    ds = DCAssignLocation( &dst, ll, ti->size );
    if( ds != DS_OK ) return( ds );
    ds = DCItemLocation( lc, CI_DEF_ADDR_SPACE, ll );
    if( ds != DS_OK ) return( ds );
    if( ti->modifier == TM_NEAR ) {
        if( ti->size == sizeof( addr32_off ) ) {
            ll->e[0].u.addr.mach.offset = tmp.ao32;
        } else {
            ll->e[0].u.addr.mach.offset = tmp.ao48;
        }
    } else {
        if( ti->size == sizeof( addr32_ptr ) ) {
            ll->e[0].u.addr.mach.offset = tmp.ap32.offset;
            ll->e[0].u.addr.mach.segment = tmp.ap32.segment;
        } else {
            ll->e[0].u.addr.mach.offset = tmp.ap48.offset;
            ll->e[0].u.addr.mach.segment = tmp.ap48.segment;
        }
    }
    return( DS_OK );
}

void NYI( void )
{
    volatile int a = 0;
    volatile int b = 0;
    DCWrite( 2, "\a\a\a\a\a\a\a", 8 );
    a /= b; /* cause a fault */
}

void Confused( void )
{
    /* don't know what's happening */
    NYI();
}