275 lines
6.7 KiB
C
275 lines
6.7 KiB
C
/* $NetBSD: sym.c,v 1.1.1.1 2009/10/26 00:27:03 christos Exp $ */
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/* sym - symbol table routines */
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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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/* This code is derived from software contributed to Berkeley by */
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/* Vern Paxson. */
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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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/* This file is part of flex. */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following conditions */
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/* are met: */
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/* 1. Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* 2. Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in the */
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/* documentation and/or other materials provided with the distribution. */
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/* Neither the name of the University nor the names of its contributors */
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/* may be used to endorse or promote products derived from this software */
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/* without specific prior written permission. */
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/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
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/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
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/* PURPOSE. */
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#include "flexdef.h"
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/* Variables for symbol tables:
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* sctbl - start-condition symbol table
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* ndtbl - name-definition symbol table
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* ccltab - character class text symbol table
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*/
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struct hash_entry {
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struct hash_entry *prev, *next;
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char *name;
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char *str_val;
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int int_val;
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};
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typedef struct hash_entry **hash_table;
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#define NAME_TABLE_HASH_SIZE 101
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#define START_COND_HASH_SIZE 101
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#define CCL_HASH_SIZE 101
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static struct hash_entry *ndtbl[NAME_TABLE_HASH_SIZE];
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static struct hash_entry *sctbl[START_COND_HASH_SIZE];
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static struct hash_entry *ccltab[CCL_HASH_SIZE];
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/* declare functions that have forward references */
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static int addsym PROTO ((register char[], char *, int, hash_table, int));
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static struct hash_entry *findsym PROTO ((register const char *sym,
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hash_table table,
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int table_size));
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static int hashfunct PROTO ((register const char *, int));
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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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static 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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if (!strcmp (sym, sym_entry->name)) { /* 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]) != 0) {
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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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(void) addsym ((char *) copy_unsigned_string (ccltxt),
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(char *) 0, cclnum, 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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static struct hash_entry *findsym (sym, table, table_size)
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register const 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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(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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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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static int hashfunct (str, hash_size)
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register const 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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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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const char *name;
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Char definition[];
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{
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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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const 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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}
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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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const char *str;
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int xcluflg;
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{
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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 (_
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("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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const 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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