asgnop.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 79 行

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*                            Open Watcom Project
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//
// ASGNOP    : assignment code generation routines
//

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

extern  void            AsgnChar(void);

void    AsgnOp( TYPE typ1, TYPE typ2, OPTR opr ) {
//================================================

// Generate code to perform an assign operation.

    typ1 = typ1; typ2 = typ2; opr = opr;
    if( ResultType == TY_CHAR ) {
        AsgnChar();
    } else {
        EmitOp( FC_POP );
        SymRef( CITNode );
        GenTypes( CITNode, CITNode->link );
        if( CITNode->sym_ptr->ns.typ == TY_STRUCTURE ) {
            if( CITNode->opn.us & USOPN_SAFE ) {
                // destination is a sub-field or an array element
                OutU16( 1 );
                if( CITNode->typ == TY_STRUCTURE ) {
                    if( CITNode->opn.us & USOPN_FLD ) {
                        // sub-field is a structure
                        OutPtr( CITNode->value.st.field_id );
                    } else {
                        // array element is a structure
                        OutPtr( NULL );
                    }
                }
            } else {
                // destination is a structure
                OutU16( 0 );
            }
        }
    }
    SetOpn( CITNode, USOPN_SAFE ); // CGAssign() leaves "cg_name" on stack
}