csremblk.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 187 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
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


//
// CSREMBLK  : processing for remote blocks and EXECUTE
//

#include "ftnstd.h"
#include "errcod.h"
#include "namecod.h"
#include "global.h"
#include "recog.h"
#include "ferror.h"
#include "insert.h"
#include "utility.h"

extern void             BIOutSymbol( sym_id ste_ptr );
extern void             BIStartRBorEP( sym_id ste_ptr );
extern void             BIEndRBorEP( void );
extern  label_id        NextLabel(void);
extern  void            AddCSNode(byte);
extern  void            DelCSNode(void);
extern  bool            CheckCSList(byte);
extern  void            Match(void);
extern  bool            EmptyCSList(void);
extern  void            CSExtn(void);
extern  void            CSNoMore(void);
extern  sym_id          LkSym(void);
extern  void            GLabel(label_id);
extern  void            GBranch(label_id);
extern  void            GStartBlock(void);
extern  void            GExecute(void);
extern  void            GEndBlock(void);
extern  void            ClearRem(void);
extern  void            FreeLabel(label_id);

#define RB_FLAGS (SY_USAGE | SY_SUBPROGRAM | SY_REMOTE_BLOCK)


static  bool    BlockName( unsigned_16 rb_defined ) {
//===================================================

    sym_id      sym_ptr;
    unsigned_16 flag_mask;
    bool        rb_name;

    CSExtn();
    rb_name = FALSE;
    if( ReqName( NAME_REM_BLOCK ) ) {
        sym_ptr = LkSym();
        if( ( sym_ptr->ns.flags & ~SY_REFERENCED ) == 0 ) {
            sym_ptr->ns.si.rb.entry = NextLabel();
            sym_ptr->ns.flags = RB_FLAGS;
        }
        flag_mask = (unsigned_16)~( SY_RB_DEFINED | SY_REFERENCED );
        if( ( ( sym_ptr->ns.flags & flag_mask ) == RB_FLAGS ) &&
            ( ( sym_ptr->ns.flags & rb_defined ) == 0 ) ) {
            sym_ptr->ns.flags |= rb_defined;
            rb_name = TRUE;
        } else {
            IllName( sym_ptr );
        }
    }
    return( rb_name );
}


void    CpRemBlock(void) {
//====================

    sym_id      rb;

    if( EmptyCSList() == FALSE ) {
        StmtErr( SP_BLK_IN_STRUCTURE );
    }
    AddCSNode( CS_REMOTEBLOCK );
    CSHead->bottom = NextLabel();
    CSHead->branch = NextLabel();
    GBranch( CSHead->branch );
    if( BlockName( SY_RB_DEFINED ) ) {
        rb = CITNode->sym_ptr;
        if( ( rb->ns.flags & SY_REFERENCED ) == 0 ) {
            rb->ns.si.rb.ref_count = 0;
        }
        rb->ns.si.rb.ref_count++;
        CSHead->cs_info.rb = rb;
        GStartBlock();
        BIStartRBorEP( rb );
    }
    AdvanceITPtr();
    ReqEOS();
    StNumbers.in_remote = TRUE;
    ClearRem();
}


void    CpEndBlock(void) {
//====================

    CheckCSList( CS_REMOTEBLOCK );
    if( CSHead->typ == CS_REMOTEBLOCK ) {
        GLabel( CSHead->bottom );
        FreeLabel( CSHead->bottom );
        // Make sure REMOTEBLOCK statement was valid.
        if( CSHead->cs_info.rb != NULL ) {
            GEndBlock();
        }
        GLabel( CSHead->branch );
        FreeLabel( CSHead->branch );
        DelCSNode();
    } else {
        Match();
    }
    CSNoMore();
    StNumbers.in_remote = FALSE;
    ClearRem();
    CSNoMore();
    BIEndRBorEP();
}


void    CpExecute(void) {
//===================

    sym_id      rb;

    if( StNumbers.in_remote ) {
        CkRemBlkRec();
    }
    if( BlockName( 0 ) ) {
        rb = CITNode->sym_ptr;
        if( ( rb->ns.flags & ( SY_RB_DEFINED | SY_REFERENCED ) ) == 0 ) {
            rb->ns.si.rb.ref_count = 0;
        }
        rb->ns.si.rb.ref_count++;
        BIOutSymbol( rb );              // reference and or declare the sucker
        rb->ns.flags |= SY_REFERENCED;
        GExecute();
    }
    AdvanceITPtr();
    ReqEOS();
}


static  void    CkRemBlkRec(void) {
//=============================

    csnode      *node;

    node = CSHead;
    while( node->typ != CS_REMOTEBLOCK ) {
        node = node->link;
    }
    if( CmpNode2Str( CITNode, &node->label ) ) {
        Error( SP_RECURSE );
    }
}