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/***************************************************************
SYMTAB.C
This file containts SYMBOL TABLE routines 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
/* TABLE_SIZE is the number of entries in the symbol table. */
/* TABLE_SIZE must be a power of two. */
#define TABLE_SIZE 2048
bucket **symbol_table;
bucket *first_symbol;
bucket *last_symbol;
int hash( __mpu_char16_t *name )
/***************************************************************
Description : find unique number in symbol table
Concepts : excellent !
Use Global Variable:
Use Functions :
Parameters : char *name
Return : int k;
***************************************************************/
{
register __mpu_char16_t *s;
register int c, k;
if( !name || *name == 0 )
{
done( 2 );
}
s = name;
k = *s;
while( (c = *++s) ) k = (31*k + c) & (TABLE_SIZE - 1);
return( k );
} /******* End of hash( char *name ) *************************/
bucket * make_bucket( __mpu_char16_t *name )
/***************************************************************
Description : allocate memory for symbol
Concepts :
Use Global Variable:
Use Functions :
Parameters : char *name
Return : bucket *bp
***************************************************************/
{
register bucket *bp;
if( !name )
{
done( 2 );
}
bp = (bucket *)MALLOC( sizeof( bucket ) );
if( bp == 0 ) no_space();
bp->link = 0;
bp->next = 0;
bp->name = (__mpu_char16_t *)MALLOC( (mpu_str16len( name ) + 1) *
sizeof(__mpu_char16_t) );
if( bp->name == 0 ) no_space();
mpu_str16cpy( bp->name, name );
bp->tag = 0;
bp->value = UNDEFINED;
bp->index = 0;
bp->prec = 0;
bp->class = UNKNOWN;
bp->assoc = TOKEN;
return( bp );
} /******* End of make_bucket( char *name ) ******************/
bucket * lookup( __mpu_char16_t *name )
/***************************************************************
Description : find symbol in symbol table
if symbol not found,
then (for its) allocate memory (use make_bucket ())
and include in symbol table
Concepts :
Use Global Variable: bucket *last_symbol; | this file
Use Functions :
Parameters : char *name
Return : bucket *bp
***************************************************************/
{
register bucket *bp, **bpp;
bpp = symbol_table + hash( name );
bp = *bpp;
while( bp )
{
if( mpu_str16cmp( name, bp->name ) == 0 ) return( bp );
bpp = &bp->link; /* link для связи цепочки по
одному индексу в symbol_table[] */
bp = *bpp;
/*
См.:
David Gries, Compiler Construction
for Digital Computers,
Cornell University, 1971.
Д.Грис, Конструирование компиляторов для цифровых
вычислительных машин,
Пер. с англ., Е.Б.Докшитской и др.,
Под ред. Ю.М.Баяковского, М.: Мир, 1975.
п. 9.3.2. Метод цепочек, стр. 252.
*/
}
*bpp = bp = make_bucket( name ); /* make and insert into symbol_table */
last_symbol->next = bp;
last_symbol = bp;
return( bp );
} /******* End of lookup( char *name ) ***********************/
void create_symbol_table( void )
/***************************************************************
Description : allocate memory for symbol_table
and make symbol u"error"
Concepts :
Use Global Variable: bucket *first_symbol; | this file
bucket *last_symbol; | this file
Use Functions :
Parameters : [void]
Return : [void]
***************************************************************/
{
register int i;
register bucket *bp;
symbol_table = (bucket **)MALLOC( TABLE_SIZE*sizeof( bucket * ) );
if( symbol_table == 0 ) no_space();
for( i = 0; i < TABLE_SIZE; i++ ) symbol_table[i] = 0;
bp = make_bucket( (__mpu_char16_t *)MPU_UCS2( "error" ) );
bp->index = 1;
bp->class = TERM;
first_symbol = bp;
last_symbol = bp;
symbol_table[hash( (__mpu_char16_t *)MPU_UCS2( "error" ) )] = bp;
} /******* End of create_symbol_table( void ) ****************/
void free_symbol_table( void )
/***************************************************************
Description : free memory for symbol_table
Concepts :
Use Global Variable:
Use Functions :
Parameters : [void]
Return : [void]
***************************************************************/
{
FREE( symbol_table );
symbol_table = 0;
} /******* End of free_symbol_table( void ) ******************/
void free_symbols( void )
/***************************************************************
Description : free memory for all symbols in list
Concepts :
Use Global Variable: bucket *first_symbol; | this file
Use Functions :
Parameters : [void]
Return : [void]
***************************************************************/
{
register bucket *p, *q;
for( p = first_symbol; p; p = q )
{
q = p->next;
/* TODO ADD FREE(name) and other */
FREE( p );
}
} /******* End of free_symbols( void ) ***********************/
#endif /* __NO_COMPILE */
/****************** END OF FILE SYMTAB.C *********************/
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