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|
/***************************************************************
CLOSURE.C
This file containts CLOSURE routine of ZUBR.
PART OF : ZUBR - Parsers generator for multiple syntax
language compilers .
COMPILE : .
NOTE : NONE .
Copyright (C) 1995 - 2026 by Andrey V.Kosteltsev.
All Rights Reserved.
***************************************************************/
/*
This file contant RUSSIAN letters( code-page: UTF-8 )
***************************************************************/
#include <defs.h>
#ifndef __NO_COMPILE
int *itemset; /* use in lr0.c */
int *itemsetend; /* use in lr0.c */
unsigned *ruleset; /* use in lr0.c */
static unsigned *first_derives;
static unsigned *EFF;
/************** Start of functions for debuging **************/
#ifdef _DEBUG
void print_closure( int n )
/***************************************************************
Description : print closure
Concepts : print_closure() is used for debugging
Use Global Variable: int *itemset; | this file
int *itemsetend; | this file
Use Functions :
Parameters : int n
Return : [void]
***************************************************************/
{
register int *isp;
mpu_fprintf( mpu_stdout, MPU_UCS2( "\n\nn = %d\n\n" ), n );
for( isp = itemset; isp < itemsetend; isp++ )
mpu_fprintf( mpu_stdout, MPU_UCS2( " %d\n" ), *isp );
} /******* End of print_closure( int n ) *********************/
void print_EFF( void )
/***************************************************************
Description : print EFF
Concepts : print_EFF() is used for debugging
Use Global Variable: int nsyms; | main.c
int nvars; | main.c
int start_symbol; | main.c
char **symbol_name; | main.c
Use Functions :
Parameters : [void]
Return : [void]
***************************************************************/
{
register int i, j;
register unsigned *rowp;
register unsigned word;
register unsigned mask;
mpu_fprintf( mpu_stdout,
MPU_UCS2( "\n\nEpsilon Free Firsts\n" ) );
for( i = start_symbol; i < nsyms; i++ )
{
mpu_fprintf( mpu_stdout,
MPU_UCS2( "\n%s" ), symbol_name[i] );
rowp = EFF + ((i - start_symbol) * SIZE_IN_INT( nvars ));
word = *rowp++;
mask = 1;
for( j = 0; j < nvars; j++ )
{
if( word & mask )
mpu_fprintf( mpu_stdout,
MPU_UCS2( " %s" ),
symbol_name[start_symbol + j] );
mask <<= 1;
if( mask == 0 )
{
word = *rowp++;
mask = 1;
}
} /* End of for( j = 0; j < nvars; j++ ) */
} /* End of for( i = start_symbol; i < nsyms; i++ ) */
} /******* End of print_EFF( void ) **************************/
void print_first_derives( void )
/***************************************************************
Description : print first derives
Concepts : print_first_derives() is used for debugging
Use Global Variable: int nrules; | main.c
int nsyms; | main.c
int start_symbol; | main.c
char **symbol_name; | main.c
static unsigned *first_derives; | this file
Use Functions :
Parameters : [void]
Return : [void]
***************************************************************/
{
register int i;
register int j;
register unsigned *rp;
register unsigned cword;
register unsigned mask;
mpu_fprintf( mpu_stdout,
MPU_UCS2( "\n\n\nFirst Derives\n" ) );
for( i = start_symbol; i < nsyms; i++ )
{
mpu_fprintf( mpu_stdout,
MPU_UCS2( "\n%s derives\n" ), symbol_name[i] );
rp = first_derives + i * SIZE_IN_INT( nrules );
cword = *rp++;
mask = 1;
for( j = 0; j <= nrules; j++ )
{
if( cword & mask )
mpu_fprintf( mpu_stdout, MPU_UCS2( " %d\n" ), j );
mask <<= 1;
if( mask == 0 )
{
cword = *rp++;
mask = 1;
}
} /* End of for( j = 0; j <= nrules; j++ ) */
} /* End of for( i = start_symbol; i < nsyms; i++ ) */
mpu_fflush( mpu_stdout ); /* stdio.h */
} /******* End of print_first_derives( void ) ****************/
#endif
/*************** End of functions for debuging ***************/
void set_EFF( void )
/***************************************************************
Description : set EFF
Concepts :
Use Global Variable: int nsyms; | main.c
int nvars; | main.c
int start_symbol; | main.c
int *ritem; | main.c
int *rrhs; | main.c
int **derives; | main.c
static unsigned *EFF; | this file
Use Functions : reflexive_transitive_closure (unsigned *, int);
| warshall.c
Parameters : [void]
Return : [void]
***************************************************************/
{
register unsigned *row;
register int symbol;
register int *sp;
register int rowsize, i, rule;
rowsize = SIZE_IN_INT( nvars );
EFF = NEW2( nvars * rowsize, unsigned );
row = EFF;
for( i = start_symbol; i < nsyms; i++ )
{
sp = derives[i];
for( rule = *sp; rule > 0; rule = *++sp )
{
symbol = ritem[rrhs[rule]];
if( ISVAR(symbol) )
{
symbol -= start_symbol;
SETBIT( row, symbol );
}
}
row += rowsize;
}
reflexive_transitive_closure( EFF, nvars );
#ifdef _DEBUG
print_EFF();
#endif
} /******* End of set_EFF( void ) ****************************/
void set_first_derives( void )
/***************************************************************
Description : set first derives
Concepts :
Use Global Variable: int nrules; | main.c
int nsyms; | main.c
int ntokens; | main.c
int nvars; | main.c
int start_symbol; | main.c
int **derives; | main.c
static unsigned *first_derives; | this file
Use Functions : void set_EFF( void ); | this file
Parameters : [void]
Return : [void]
***************************************************************/
{
register unsigned *rrow;
register unsigned *vrow;
register int j;
register unsigned mask;
register unsigned cword;
register int *rp;
int rule;
int i;
int rulesetsize;
int varsetsize;
rulesetsize = SIZE_IN_INT( nrules );
varsetsize = SIZE_IN_INT( nvars );
first_derives = NEW2( nvars * rulesetsize, unsigned ) -
ntokens * rulesetsize;
set_EFF();
rrow = first_derives + ntokens * rulesetsize;
for( i = start_symbol; i < nsyms; i++ )
{
vrow = EFF + ((i - ntokens) * varsetsize);
cword = *vrow++;
mask = 1;
for( j = start_symbol; j < nsyms; j++ )
{
if( cword & mask )
{
rp = derives[j];
while( (rule = *rp++) >= 0 )
{
SETBIT( rrow, rule );
}
}
mask <<= 1;
if( mask == 0 )
{
cword = *vrow++;
mask = 1;
}
}
vrow += varsetsize;
rrow += rulesetsize;
}
#ifdef _DEBUG
print_first_derives();
#endif
FREE( EFF );
} /******* End of set_first_derives( void ) ******************/
void closure( int *nucleus, int n )
/***************************************************************
Description : closure
Concepts :
Use Global Variable: int nrules; | main.c
int *ritem; | main.c
int *rrhs; | main.c
int *itemset; | this file
int *itemsetend; | this file
unsigned *ruleset; | this file
static unsigned *first_derives; | this file
Use Functions :
Parameters : int *nucleus, int n
Return : [void]
***************************************************************/
{
register int ruleno;
register unsigned word;
register unsigned mask;
register int *csp;
register unsigned *dsp;
register unsigned *rsp;
register int rulesetsize;
int *csend;
unsigned *rsend;
int symbol;
int itemno;
rulesetsize = SIZE_IN_INT( nrules );
rsp = ruleset;
rsend = ruleset + rulesetsize;
for( rsp = ruleset; rsp < rsend; rsp++ ) *rsp = 0;
csend = nucleus + n;
for( csp = nucleus; csp < csend; ++csp )
{
symbol = ritem[*csp];
if( ISVAR(symbol) )
{
dsp = first_derives + symbol * rulesetsize;
rsp = ruleset;
while( rsp < rsend ) *rsp++ |= *dsp++;
}
}
ruleno = 0;
itemsetend = itemset;
csp = nucleus;
for( rsp = ruleset; rsp < rsend; ++rsp )
{
word = *rsp;
if( word == 0 ) ruleno += ZUBR_BITS_PER_INT;
else
{
mask = 1;
while( mask )
{
if( word & mask )
{
itemno = rrhs[ruleno];
while( csp < csend && *csp < itemno )
*itemsetend++ = *csp++;
*itemsetend++ = itemno;
while( csp < csend && *csp == itemno ) ++csp;
}
mask <<= 1;
++ruleno;
}
}
}
while( csp < csend ) *itemsetend++ = *csp++;
#ifdef _DEBUG
print_closure( n );
#endif
} /******* End of closure( int *nucleus, int n ) *************/
void finalize_closure( void )
/***************************************************************
Description : finalize closure
Concepts :
Use Global Variable: int nrules; | main.c
int ntokens; | main.c
int *itemset; | this file
unsigned *ruleset; | this file
static unsigned *first_derives; | this file
Use Functions :
Parameters :
Return : [void]
***************************************************************/
{
FREE( itemset );
FREE( ruleset);
FREE( first_derives + ntokens * SIZE_IN_INT(nrules) );
} /******* End of finalize_closure( void ) *******************/
#endif /* __NO_COMPILE */
/******************* END OF FILE CLOSURE.C *******************/
|
