af3aaf871a
r124183: Work around a `label defined but not used' warning. r179549: De-register declarations. r179657: De-register declarations in non-dot-c files. r181269: Mark yy_fatal_error() as __dead2. r228992: Spelling fixes. r240518: Correct double "the the".
273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/* sym - symbol table routines */
|
|
|
|
/* Copyright (c) 1990 The Regents of the University of California. */
|
|
/* All rights reserved. */
|
|
|
|
/* This code is derived from software contributed to Berkeley by */
|
|
/* Vern Paxson. */
|
|
|
|
/* The United States Government has rights in this work pursuant */
|
|
/* to contract no. DE-AC03-76SF00098 between the United States */
|
|
/* Department of Energy and the University of California. */
|
|
|
|
/* This file is part of flex. */
|
|
|
|
/* Redistribution and use in source and binary forms, with or without */
|
|
/* modification, are permitted provided that the following conditions */
|
|
/* are met: */
|
|
|
|
/* 1. Redistributions of source code must retain the above copyright */
|
|
/* notice, this list of conditions and the following disclaimer. */
|
|
/* 2. Redistributions in binary form must reproduce the above copyright */
|
|
/* notice, this list of conditions and the following disclaimer in the */
|
|
/* documentation and/or other materials provided with the distribution. */
|
|
|
|
/* Neither the name of the University nor the names of its contributors */
|
|
/* may be used to endorse or promote products derived from this software */
|
|
/* without specific prior written permission. */
|
|
|
|
/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
|
|
/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
|
|
/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
|
|
/* PURPOSE. */
|
|
|
|
#include "flexdef.h"
|
|
|
|
/* Variables for symbol tables:
|
|
* sctbl - start-condition symbol table
|
|
* ndtbl - name-definition symbol table
|
|
* ccltab - character class text symbol table
|
|
*/
|
|
|
|
struct hash_entry {
|
|
struct hash_entry *prev, *next;
|
|
char *name;
|
|
char *str_val;
|
|
int int_val;
|
|
};
|
|
|
|
typedef struct hash_entry **hash_table;
|
|
|
|
#define NAME_TABLE_HASH_SIZE 101
|
|
#define START_COND_HASH_SIZE 101
|
|
#define CCL_HASH_SIZE 101
|
|
|
|
static struct hash_entry *ndtbl[NAME_TABLE_HASH_SIZE];
|
|
static struct hash_entry *sctbl[START_COND_HASH_SIZE];
|
|
static struct hash_entry *ccltab[CCL_HASH_SIZE];
|
|
|
|
|
|
/* declare functions that have forward references */
|
|
|
|
static int addsym PROTO ((char[], char *, int, hash_table, int));
|
|
static struct hash_entry *findsym PROTO ((const char *sym,
|
|
hash_table table,
|
|
|
|
int table_size));
|
|
static int hashfunct PROTO ((const char *, int));
|
|
|
|
|
|
/* addsym - add symbol and definitions to symbol table
|
|
*
|
|
* -1 is returned if the symbol already exists, and the change not made.
|
|
*/
|
|
|
|
static int addsym (sym, str_def, int_def, table, table_size)
|
|
char sym[];
|
|
char *str_def;
|
|
int int_def;
|
|
hash_table table;
|
|
int table_size;
|
|
{
|
|
int hash_val = hashfunct (sym, table_size);
|
|
struct hash_entry *sym_entry = table[hash_val];
|
|
struct hash_entry *new_entry;
|
|
struct hash_entry *successor;
|
|
|
|
while (sym_entry) {
|
|
if (!strcmp (sym, sym_entry->name)) { /* entry already exists */
|
|
return -1;
|
|
}
|
|
|
|
sym_entry = sym_entry->next;
|
|
}
|
|
|
|
/* create new entry */
|
|
new_entry = (struct hash_entry *)
|
|
flex_alloc (sizeof (struct hash_entry));
|
|
|
|
if (new_entry == NULL)
|
|
flexfatal (_("symbol table memory allocation failed"));
|
|
|
|
if ((successor = table[hash_val]) != 0) {
|
|
new_entry->next = successor;
|
|
successor->prev = new_entry;
|
|
}
|
|
else
|
|
new_entry->next = NULL;
|
|
|
|
new_entry->prev = NULL;
|
|
new_entry->name = sym;
|
|
new_entry->str_val = str_def;
|
|
new_entry->int_val = int_def;
|
|
|
|
table[hash_val] = new_entry;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* cclinstal - save the text of a character class */
|
|
|
|
void cclinstal (ccltxt, cclnum)
|
|
Char ccltxt[];
|
|
int cclnum;
|
|
{
|
|
/* We don't bother checking the return status because we are not
|
|
* called unless the symbol is new.
|
|
*/
|
|
|
|
(void) addsym ((char *) copy_unsigned_string (ccltxt),
|
|
(char *) 0, cclnum, ccltab, CCL_HASH_SIZE);
|
|
}
|
|
|
|
|
|
/* ccllookup - lookup the number associated with character class text
|
|
*
|
|
* Returns 0 if there's no CCL associated with the text.
|
|
*/
|
|
|
|
int ccllookup (ccltxt)
|
|
Char ccltxt[];
|
|
{
|
|
return findsym ((char *) ccltxt, ccltab, CCL_HASH_SIZE)->int_val;
|
|
}
|
|
|
|
|
|
/* findsym - find symbol in symbol table */
|
|
|
|
static struct hash_entry *findsym (sym, table, table_size)
|
|
const char *sym;
|
|
hash_table table;
|
|
int table_size;
|
|
{
|
|
static struct hash_entry empty_entry = {
|
|
(struct hash_entry *) 0, (struct hash_entry *) 0,
|
|
(char *) 0, (char *) 0, 0,
|
|
};
|
|
struct hash_entry *sym_entry =
|
|
|
|
table[hashfunct (sym, table_size)];
|
|
|
|
while (sym_entry) {
|
|
if (!strcmp (sym, sym_entry->name))
|
|
return sym_entry;
|
|
sym_entry = sym_entry->next;
|
|
}
|
|
|
|
return &empty_entry;
|
|
}
|
|
|
|
/* hashfunct - compute the hash value for "str" and hash size "hash_size" */
|
|
|
|
static int hashfunct (str, hash_size)
|
|
const char *str;
|
|
int hash_size;
|
|
{
|
|
int hashval;
|
|
int locstr;
|
|
|
|
hashval = 0;
|
|
locstr = 0;
|
|
|
|
while (str[locstr]) {
|
|
hashval = (hashval << 1) + (unsigned char) str[locstr++];
|
|
hashval %= hash_size;
|
|
}
|
|
|
|
return hashval;
|
|
}
|
|
|
|
|
|
/* ndinstal - install a name definition */
|
|
|
|
void ndinstal (name, definition)
|
|
const char *name;
|
|
Char definition[];
|
|
{
|
|
|
|
if (addsym (copy_string (name),
|
|
(char *) copy_unsigned_string (definition), 0,
|
|
ndtbl, NAME_TABLE_HASH_SIZE))
|
|
synerr (_("name defined twice"));
|
|
}
|
|
|
|
|
|
/* ndlookup - lookup a name definition
|
|
*
|
|
* Returns a nil pointer if the name definition does not exist.
|
|
*/
|
|
|
|
Char *ndlookup (nd)
|
|
const char *nd;
|
|
{
|
|
return (Char *) findsym (nd, ndtbl, NAME_TABLE_HASH_SIZE)->str_val;
|
|
}
|
|
|
|
|
|
/* scextend - increase the maximum number of start conditions */
|
|
|
|
void scextend ()
|
|
{
|
|
current_max_scs += MAX_SCS_INCREMENT;
|
|
|
|
++num_reallocs;
|
|
|
|
scset = reallocate_integer_array (scset, current_max_scs);
|
|
scbol = reallocate_integer_array (scbol, current_max_scs);
|
|
scxclu = reallocate_integer_array (scxclu, current_max_scs);
|
|
sceof = reallocate_integer_array (sceof, current_max_scs);
|
|
scname = reallocate_char_ptr_array (scname, current_max_scs);
|
|
}
|
|
|
|
|
|
/* scinstal - make a start condition
|
|
*
|
|
* NOTE
|
|
* The start condition is "exclusive" if xcluflg is true.
|
|
*/
|
|
|
|
void scinstal (str, xcluflg)
|
|
const char *str;
|
|
int xcluflg;
|
|
{
|
|
|
|
if (++lastsc >= current_max_scs)
|
|
scextend ();
|
|
|
|
scname[lastsc] = copy_string (str);
|
|
|
|
if (addsym (scname[lastsc], (char *) 0, lastsc,
|
|
sctbl, START_COND_HASH_SIZE))
|
|
format_pinpoint_message (_
|
|
("start condition %s declared twice"),
|
|
str);
|
|
|
|
scset[lastsc] = mkstate (SYM_EPSILON);
|
|
scbol[lastsc] = mkstate (SYM_EPSILON);
|
|
scxclu[lastsc] = xcluflg;
|
|
sceof[lastsc] = false;
|
|
}
|
|
|
|
|
|
/* sclookup - lookup the number associated with a start condition
|
|
*
|
|
* Returns 0 if no such start condition.
|
|
*/
|
|
|
|
int sclookup (str)
|
|
const char *str;
|
|
{
|
|
return findsym (str, sctbl, START_COND_HASH_SIZE)->int_val;
|
|
}
|