fclogic.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 148 行

/****************************************************************************
*
*                            Open Watcom Project
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*    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
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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//
// FCLOGIC   : logical operator F-Code processor
//

#include "ftnstd.h"
#include "cgdefs.h"
#include "cg.h"
#include "emitobj.h"
#include "fctypes.h"

//=================== Back End Code Generation Routines ====================

extern  cg_name         CGFlow(cg_op,cg_name,cg_name);
extern  cg_name         CGCompare(cg_op,cg_name,cg_name,cg_type);
extern  cg_name         CGInteger(signed_32,cg_type);
extern  cg_type         CGType(cg_name);

//=========================================================================

extern  cg_name         XPop(void);
extern  cg_name         XPopValue(cg_type);
extern  cg_name         GetTypedValue(void);
extern  void            XPush(cg_name);


void    FCEqv( void ) {
//===============

// Logical .EQV. F-Code processor.

    Equivalent( O_EQ );
}


void    FCNEqv( void ) {
//================

// Logical .NEQV. F-Code processor.

    Equivalent( O_NE );
}


static  void    Equivalent( cg_op op_code ) {
//===========================================


    cg_name     op1;
    cg_name     op2;
    unsigned_16 typ_info;
    cg_type     typ1;
    cg_type     typ2;

    typ_info = GetU16();
    typ1 = GetType1( typ_info );
    typ2 = GetType2( typ_info );
    op1 = XPopValue( typ1 );
    op2 = XPopValue( typ2 );
    typ1 = CGType( op1 );
    if( typ1 != T_BOOLEAN ) {
        op1 = CGCompare( O_NE, op1, CGInteger( 0, typ1 ), typ1 );
    }
    typ2 = CGType( op2 );
    if( typ2 != T_BOOLEAN ) {
        op2 = CGCompare( O_NE, op2, CGInteger( 0, typ2 ), typ2 );
    }
    XPush( CGCompare( op_code, op1, op2, T_UINT_1 ) );
}


void    FCOr( void ) {
//==============

// Logical .OR. F-Code processor.

    XLogic( O_FLOW_OR );
}


void    FCAnd( void ) {
//===============

// Logical .AND. F-Code processor.

    XLogic( O_FLOW_AND );
}


static  void    XLogic( int op_code ) {
//=====================================

// Logical operator F-Code processor.

    cg_name     op1;
    cg_name     op2;
    unsigned_16 typ_info;
    cg_type     typ1;
    cg_type     typ2;

    typ_info = GetU16();
    typ1 = GetType1( typ_info );
    typ2 = GetType2( typ_info );
    op1 = XPopValue( typ1 );
    op2 = XPopValue( typ2 );
    XPush( CGFlow( op_code, op1, op2 ) );
}


void    FCNot( void ) {
//===============

// Logical .NOT. F-Code processor.

    XPush( CGFlow( O_FLOW_NOT, GetTypedValue(), NULL ) );
}