rscdata.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 249 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 "standard.h"
#include "coderep.h"
#include "offset.h"
#include "typedef.h"
#include "zoiks.h"
#include "reloc.h"
#include "sysmacro.h"
#include "feprotos.h"
#include <assert.h>
#include <string.h>

extern  void            ObjBytes( char *, unsigned );
extern  constant_defn   *GetFloat( name *, type_class_def );
extern  seg_id          SetOP( seg_id );
extern  seg_id          AskBackSeg( void );
extern  name            *AllocMemory(pointer,type_length,cg_class,type_class_def);
extern  label_handle    AskForLabel( sym_handle );
extern  void            OutLabel( label_handle );
extern  void            OutReloc( label_handle, owl_reloc_type, unsigned );
extern  void            OutSegReloc( label_handle *label, seg_id section );
extern  void            AlignObject( unsigned );
extern  offset          AskLocation( void );
extern  void            TellOptimizerByPassed( void );
extern  void            TellByPassOver( void );
extern  bool            AskSegBlank( seg_id );
extern  void            IncLocation( offset );
extern  seg_id          AskOP( void );

extern  type_length     TypeClassSize[];

extern  void    DataAlign( unsigned_32 align ) {
/**********************************************/

    offset      curr_loc;
    uint        modulus;

    curr_loc = AskLocation();
    modulus = curr_loc % align;
    if( modulus != 0 ) {
        if( AskSegBlank( AskOP() ) == FALSE ) {
            IterBytes( (offset)( align - modulus ), 0 );
        } else {
            IncLocation( align - modulus );
        }
    }
}

extern  void    DataBytes( unsigned_32 len, byte *src ) {
/*******************************************************/

    TellOptimizerByPassed();
    ObjBytes( src, len );
    TellByPassOver();
}

extern  void    DataInt( short_offset val ) {
/*************************************/

    TellOptimizerByPassed();
    ObjBytes( (byte*)&val, sizeof( val ) );
    TellByPassOver();
}

extern  void    DataLong( long val ) {
/*************************************/

    TellOptimizerByPassed();
    ObjBytes( (byte*)&val, sizeof( val ) );
    TellByPassOver();
}

// FIXME: This is a cheap, lousy hack
#define MAX_HACK_LEN    ( 8 * 1024 )
static char     Buffer[ MAX_HACK_LEN ];

extern  void    IterBytes( offset len, byte pat ) {
/***********************************************/

    TellOptimizerByPassed();
    if( len > MAX_HACK_LEN ) {
        char    *buff;

        _Alloc( buff, len );
        memset( buff, pat, len );
        ObjBytes( &buff[ 0 ], len );
        _Free( buff, len );
    } else {
        memset( Buffer, pat, len );
        ObjBytes( &Buffer[ 0 ], len );
    }
    TellByPassOver();
}

extern  void    BackPtr( bck_info *bck, seg_id seg,
                         offset plus, type_def *tipe ) {
/*****************************************************/

    seg = seg;
    assert( tipe->length == 4 );
    TellOptimizerByPassed();
    OutReloc( bck->lbl, OWL_RELOC_WORD, 0 );
    ObjBytes( (char *)&plus, 4 );
    TellByPassOver();
}

extern  void    BackBigOffset( bck_info *bck, seg_id seg,
                         offset plus ) {
/*****************************************************/
    seg = seg;
    TellOptimizerByPassed();
    OutReloc( bck->lbl, OWL_RELOC_WORD, 0 );
    ObjBytes( (char *)&plus, 4 );
    TellByPassOver();
}

extern  void    BackPtrBase( bck_info *bck, seg_id seg ){
/*****************************************************/
    TellOptimizerByPassed();
    OutSegReloc( bck->lbl, seg );
    ObjBytes( "\0\0", 2 );
    TellByPassOver();
}

extern  void    FEPtr( sym_handle sym, type_def *tipe, offset plus ) {
/*******************************************************************/

    bck_info            *bck;

    tipe = tipe;
    assert( tipe->length == 4 );
    TellOptimizerByPassed();
    bck = FEBack( sym );
    OutReloc( bck->lbl, OWL_RELOC_WORD, 0 );
    ObjBytes( (char *)&plus, 4 );
    TellByPassOver();
}

extern  void    FEPtrBaseOffset( sym_handle sym,  offset plus ) {
/***************************************************************/
    bck_info            *bck;
    seg_id              seg;

    TellOptimizerByPassed();
    bck = FEBack( sym );
    seg = FESegID( sym );
    OutReloc( bck->lbl, OWL_RELOC_SECTION_INDEX, 0 );
    ObjBytes( (char *)&plus, 4 );
//  OutSegReloc( bck->lbl, seg );
    OutReloc( bck->lbl, OWL_RELOC_SECTION_OFFSET, 0 );
    ObjBytes( "\0\0", 2 );
    TellByPassOver();
}

extern  void    FEPtrBase( sym_handle sym ) {
/*********************************************************/
    bck_info            *bck;
    seg_id              seg;

    TellOptimizerByPassed();
    bck = FEBack( sym );
    seg = FESegID( sym );
    OutSegReloc( bck->lbl, seg );
    ObjBytes( "\0\0", 2 );
    TellByPassOver();
}


extern  void    DataLabel( label_handle lbl ) {
/*********************************************/
    TellOptimizerByPassed();
    OutLabel( lbl );
    TellByPassOver();
}

static constant_defn    *GetI64Const( name *cons, type_class_def class ) {
/************************************************************************/

    static constant_defn i64Defn = { NULL, NULL, { 0, 0, 0, 0 }, I8 };

    i64Defn.label = NULL;
    i64Defn.const_class = class;
    i64Defn.value[ 0 ] = cons->c.int_value & 0xffff;
    i64Defn.value[ 1 ] = ( cons->c.int_value >> 16 ) & 0xffff;
    i64Defn.value[ 2 ] = cons->c.int_value_2 & 0xffff;
    i64Defn.value[ 3 ] = ( cons->c.int_value_2 >> 16 ) & 0xffff;
    return( &i64Defn );
}

extern  name    *GenFloat( name *cons, type_class_def class ) {
/*************************************************************/

    constant_defn       *defn;
    seg_id              old;
    name                *result;

    TellOptimizerByPassed();
    if( _IsFloating( class ) ) {
        defn = GetFloat( cons, class );
    } else {
        defn = GetI64Const( cons, class );
    }
    if( defn->label == NULL ) {
        defn->label = AskForLabel( NULL );
        old = SetOP( AskBackSeg() );
        AlignObject( 8 );
        assert( ( AskLocation() & 0x07 ) == 0 );
        OutLabel( defn->label );
        DataBytes( TypeClassSize[ class ], (byte *)&defn->value );
        SetOP( old );

    }
    result = AllocMemory( defn->label, 0, CG_LBL, class );
    result->v.usage |= USE_IN_ANOTHER_BLOCK;
    TellByPassOver();
    return( result );
}