fieldops.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 91 行

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*                            Open Watcom Project
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//
// FIELDOPS     : field selection operator generation routines
//

#include "ftnstd.h"
#include "global.h"
#include "opn.h"
#include "fcodes.h"
#include "stmtsw.h"
#include "optr.h"
#include "emitobj.h"
#include "types.h"

extern  sym_id          GTempString(uint);


void    GFieldSCB( inttarg size ) {
//=================================

// Setup an SCB for a character field.

    PushConst( size );
    EmitOp( FC_FLIP );
}


void    FieldOp( TYPE typ1, TYPE typ2, OPTR op ) {
//================================================

// Generate code for a field selection operator.

    typ1 = typ1; op = op;
    PushOpn( CITNode->link );
    PushOpn( CITNode );
    if( CITNode->opn.us & USOPN_FLD ) {
        // sub-field reference
        EmitOp( FC_ADD );
        DumpTypes( TY_INTEGER, TypeSize( TY_INTEGER ),
                   TY_INTEGER, TypeSize( TY_INTEGER ) );
    } else {
        EmitOp( FC_FIELD_OP );
        OutPtr( CITNode->sym_ptr );
        if( ( StmtSw & SS_DATA_INIT ) == 0 ) {
            if( typ2 == TY_CHAR ) {
                if( ( CITNode->link->opn.us & USOPN_WHAT ) != USOPN_ARR ) {
                    if( ( ( CITNode->link->opn.us & USOPN_WHAT ) != USOPN_NWL ) &&
                        ( ( CITNode->link->opn.us & USOPN_WHAT ) != USOPN_ASS ) ) {
                        GFieldSCB( CITNode->link->size );
                    }
                    EmitOp( FC_MAKE_SCB );
                    OutPtr( GTempString( 0 ) );
                }
            }
        } else {
            OutPtr( CITNode->link->sym_ptr );
        }
    }
}