csguess.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 101 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
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*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


//
// CSGUESS   : processing for GUESS, ADMIT, and ENDGUESS
//

#include "ftnstd.h"
#include "errcod.h"
#include "global.h"

extern  void            AddCSNode(byte);
extern  void            DelCSNode(void);
extern  void            BlockLabel(void);
extern  void            CSNoMore(void);
extern  void            CSExtn(void);
extern  void            Match(void);
extern  void            GLabel(label_id);
extern  void            GBranch(label_id);
extern  label_id        NextLabel(void);
extern  void            FreeLabel(label_id);


void    CpGuess(void) {
//=================

// Process a GUESS statement.

    CSExtn();
    AddCSNode( CS_GUESS );
    CSHead->branch = NextLabel();
    CSHead->bottom = NextLabel();
    BlockLabel();
}


void    CpAdmit(void) {
//=================

// Process an ADMIT statement.

    if( ( CSHead->typ == CS_GUESS ) | ( CSHead->typ == CS_ADMIT ) ) {
        GBranch( CSHead->bottom );
        GLabel( CSHead->branch );
        FreeLabel( CSHead->branch );
        CSHead->typ = CS_ADMIT;
        CSHead->branch = NextLabel();
        CSHead->block = ++BlockNum;
    } else {
        Match();
    }
    CSNoMore();
}


void    CpEndGuess(void) {
//====================

// Process an ENDGUESS statement.

    if( ( CSHead->typ == CS_GUESS ) | ( CSHead->typ == CS_ADMIT ) ) {
        GLabel( CSHead->branch );
        GLabel( CSHead->bottom );
        FreeLabel( CSHead->branch );
        FreeLabel( CSHead->bottom );
    } else {
        Match();
    }
    DelCSNode();
    CSNoMore();
}