csatend.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 111 行

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*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    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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//
// CSATEND   : processing for AT END and END AT END
//

#include "ftnstd.h"
#include "errcod.h"
#include "ctrlflgs.h"
#include "stmtsw.h"
#include "opn.h"
#include "global.h"
#include "recog.h"
#include "utility.h"

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


void    CpAtEnd(void) {
//=================

// Process an ATEND statement.

    label_id    skip;
    label_id    code;

    CSExtn();
    skip = NextLabel();
    code = NextLabel();
    GBranch( skip );
    GCheckEOF( code );
    if( RecKeyWord( "DO" ) ) {
        AddCSNode( CS_ATEND );
        CSHead->bottom = skip;
        CITNode->opn.ds = DSOPN_PHI;       // not part of the block label
        BlockLabel();
        CtrlFlgs |= CF_BAD_DO_ENDING;
        GLabel( code );
        FreeLabel( code );
    } else {
        AdvanceITPtr();
        ReqComma();
        if( ( StmtSw & SS_COMMA_THEN_EQ ) != 0 ) {
            StmtSw &= ~SS_COMMA_THEN_EQ;  // consider AT END, DATA == 0
            StmtSw |= SS_EQUALS_FOUND;
        }
        GLabel( code );
        Recurse();
        GLabel( skip );
        FreeLabel( code );
        FreeLabel( skip );
    }
}


void    CpEndAtEnd(void) {
//====================

// Process an ENDATEND statement.

    if( CSHead->typ == CS_ATEND ) {
        GLabel( CSHead->bottom );
        FreeLabel( CSHead->bottom );
    } else {
        Match();
    }
    DelCSNode();
    CSNoMore();
}