263 lines
6.1 KiB
C
263 lines
6.1 KiB
C
/* sym - symbol table routines */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* $Header: /home/ncvs/src/usr.bin/lex/sym.c,v 1.1.1.1 1994/08/24 13:10:31 csgr Exp $ */
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#include "flexdef.h"
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/* declare functions that have forward references */
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int hashfunct PROTO((register char[], int));
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struct hash_entry *ndtbl[NAME_TABLE_HASH_SIZE];
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struct hash_entry *sctbl[START_COND_HASH_SIZE];
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struct hash_entry *ccltab[CCL_HASH_SIZE];
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struct hash_entry *findsym();
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/* addsym - add symbol and definitions to symbol table
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*
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* -1 is returned if the symbol already exists, and the change not made.
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*/
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int addsym( sym, str_def, int_def, table, table_size )
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register char sym[];
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char *str_def;
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int int_def;
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hash_table table;
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int table_size;
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{
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int hash_val = hashfunct( sym, table_size );
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register struct hash_entry *sym_entry = table[hash_val];
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register struct hash_entry *new_entry;
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register struct hash_entry *successor;
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while ( sym_entry )
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{
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if ( ! strcmp( sym, sym_entry->name ) )
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{ /* entry already exists */
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return -1;
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}
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sym_entry = sym_entry->next;
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}
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/* create new entry */
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new_entry = (struct hash_entry *)
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flex_alloc( sizeof( struct hash_entry ) );
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if ( new_entry == NULL )
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flexfatal( "symbol table memory allocation failed" );
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if ( (successor = table[hash_val]) )
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{
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new_entry->next = successor;
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successor->prev = new_entry;
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}
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else
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new_entry->next = NULL;
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new_entry->prev = NULL;
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new_entry->name = sym;
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new_entry->str_val = str_def;
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new_entry->int_val = int_def;
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table[hash_val] = new_entry;
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return 0;
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}
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/* cclinstal - save the text of a character class */
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void cclinstal( ccltxt, cclnum )
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Char ccltxt[];
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int cclnum;
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{
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/* We don't bother checking the return status because we are not
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* called unless the symbol is new.
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*/
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Char *copy_unsigned_string();
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(void) addsym( (char *) copy_unsigned_string( ccltxt ),
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(char *) 0, cclnum,
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ccltab, CCL_HASH_SIZE );
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}
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/* ccllookup - lookup the number associated with character class text
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*
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* Returns 0 if there's no CCL associated with the text.
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*/
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int ccllookup( ccltxt )
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Char ccltxt[];
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{
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return findsym( (char *) ccltxt, ccltab, CCL_HASH_SIZE )->int_val;
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}
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/* findsym - find symbol in symbol table */
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struct hash_entry *findsym( sym, table, table_size )
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register char sym[];
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hash_table table;
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int table_size;
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{
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static struct hash_entry empty_entry =
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{
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(struct hash_entry *) 0, (struct hash_entry *) 0,
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(char *) 0, (char *) 0, 0,
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} ;
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register struct hash_entry *sym_entry =
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table[hashfunct( sym, table_size )];
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while ( sym_entry )
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{
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if ( ! strcmp( sym, sym_entry->name ) )
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return sym_entry;
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sym_entry = sym_entry->next;
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}
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return &empty_entry;
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}
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/* hashfunct - compute the hash value for "str" and hash size "hash_size" */
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int hashfunct( str, hash_size )
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register char str[];
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int hash_size;
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{
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register int hashval;
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register int locstr;
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hashval = 0;
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locstr = 0;
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while ( str[locstr] )
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{
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hashval = (hashval << 1) + (unsigned char) str[locstr++];
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hashval %= hash_size;
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}
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return hashval;
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}
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/* ndinstal - install a name definition */
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void ndinstal( name, definition )
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char name[];
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Char definition[];
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{
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char *copy_string();
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Char *copy_unsigned_string();
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if ( addsym( copy_string( name ),
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(char *) copy_unsigned_string( definition ), 0,
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ndtbl, NAME_TABLE_HASH_SIZE ) )
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synerr( "name defined twice" );
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}
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/* ndlookup - lookup a name definition
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*
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* Returns a nil pointer if the name definition does not exist.
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*/
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Char *ndlookup( nd )
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char nd[];
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{
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return (Char *) findsym( nd, ndtbl, NAME_TABLE_HASH_SIZE )->str_val;
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}
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/* scextend - increase the maximum number of start conditions */
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void scextend()
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{
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current_max_scs += MAX_SCS_INCREMENT;
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++num_reallocs;
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scset = reallocate_integer_array( scset, current_max_scs );
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scbol = reallocate_integer_array( scbol, current_max_scs );
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scxclu = reallocate_integer_array( scxclu, current_max_scs );
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sceof = reallocate_integer_array( sceof, current_max_scs );
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scname = reallocate_char_ptr_array( scname, current_max_scs );
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actvsc = reallocate_integer_array( actvsc, current_max_scs );
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}
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/* scinstal - make a start condition
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*
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* NOTE
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* The start condition is "exclusive" if xcluflg is true.
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*/
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void scinstal( str, xcluflg )
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char str[];
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int xcluflg;
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{
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char *copy_string();
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/* Generate start condition definition, for use in BEGIN et al. */
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printf( "#define %s %d\n", str, lastsc );
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if ( ++lastsc >= current_max_scs )
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scextend();
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scname[lastsc] = copy_string( str );
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if ( addsym( scname[lastsc], (char *) 0, lastsc,
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sctbl, START_COND_HASH_SIZE ) )
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format_pinpoint_message( "start condition %s declared twice",
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str );
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scset[lastsc] = mkstate( SYM_EPSILON );
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scbol[lastsc] = mkstate( SYM_EPSILON );
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scxclu[lastsc] = xcluflg;
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sceof[lastsc] = false;
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}
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/* sclookup - lookup the number associated with a start condition
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*
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* Returns 0 if no such start condition.
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*/
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int sclookup( str )
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char str[];
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{
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return findsym( str, sctbl, START_COND_HASH_SIZE )->int_val;
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}
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