Annotation of src/usr.bin/yacc/symtab.c, Revision 1.6
1.6 ! millert 1: /* $OpenBSD: symtab.c,v 1.5 2001/11/19 19:02:18 mpech Exp $ */
1.2 deraadt 2: /* $NetBSD: symtab.c,v 1.4 1996/03/19 03:21:48 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1989 The Regents of the University of California.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Robert Paul Corbett.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
1.1 deraadt 40: #ifndef lint
1.2 deraadt 41: #if 0
42: static char sccsid[] = "@(#)symtab.c 5.3 (Berkeley) 6/1/90";
43: #else
1.6 ! millert 44: static char rcsid[] = "$OpenBSD: symtab.c,v 1.5 2001/11/19 19:02:18 mpech Exp $";
1.2 deraadt 45: #endif
1.1 deraadt 46: #endif /* not lint */
47:
48: #include "defs.h"
49:
50: /* TABLE_SIZE is the number of entries in the symbol table. */
51: /* TABLE_SIZE must be a power of two. */
52:
53: #define TABLE_SIZE 1024
54:
55:
56: bucket **symbol_table;
57: bucket *first_symbol;
58: bucket *last_symbol;
59:
1.6 ! millert 60: int hash(char *);
1.4 pvalchev 61:
1.1 deraadt 62:
63: int
64: hash(name)
65: char *name;
66: {
1.5 mpech 67: char *s;
68: int c, k;
1.1 deraadt 69:
70: assert(name && *name);
71: s = name;
72: k = *s;
73: while (c = *++s)
74: k = (31*k + c) & (TABLE_SIZE - 1);
75:
76: return (k);
77: }
78:
79:
80: bucket *
81: make_bucket(name)
82: char *name;
83: {
1.5 mpech 84: bucket *bp;
1.1 deraadt 85:
86: assert(name);
87: bp = (bucket *) MALLOC(sizeof(bucket));
88: if (bp == 0) no_space();
89: bp->link = 0;
90: bp->next = 0;
91: bp->name = MALLOC(strlen(name) + 1);
92: if (bp->name == 0) no_space();
93: bp->tag = 0;
94: bp->value = UNDEFINED;
95: bp->index = 0;
96: bp->prec = 0;
97: bp-> class = UNKNOWN;
98: bp->assoc = TOKEN;
99:
100: if (bp->name == 0) no_space();
101: strcpy(bp->name, name);
102:
103: return (bp);
104: }
105:
106:
107: bucket *
108: lookup(name)
109: char *name;
110: {
1.5 mpech 111: bucket *bp, **bpp;
1.1 deraadt 112:
113: bpp = symbol_table + hash(name);
114: bp = *bpp;
115:
116: while (bp)
117: {
118: if (strcmp(name, bp->name) == 0) return (bp);
119: bpp = &bp->link;
120: bp = *bpp;
121: }
122:
123: *bpp = bp = make_bucket(name);
124: last_symbol->next = bp;
125: last_symbol = bp;
126:
127: return (bp);
128: }
129:
130:
1.4 pvalchev 131: void
1.1 deraadt 132: create_symbol_table()
133: {
1.5 mpech 134: int i;
135: bucket *bp;
1.1 deraadt 136:
137: symbol_table = (bucket **) MALLOC(TABLE_SIZE*sizeof(bucket *));
138: if (symbol_table == 0) no_space();
139: for (i = 0; i < TABLE_SIZE; i++)
140: symbol_table[i] = 0;
141:
142: bp = make_bucket("error");
143: bp->index = 1;
144: bp->class = TERM;
145:
146: first_symbol = bp;
147: last_symbol = bp;
148: symbol_table[hash("error")] = bp;
149: }
150:
151:
1.4 pvalchev 152: void
1.1 deraadt 153: free_symbol_table()
154: {
155: FREE(symbol_table);
156: symbol_table = 0;
157: }
158:
159:
1.4 pvalchev 160: void
1.1 deraadt 161: free_symbols()
162: {
1.5 mpech 163: bucket *p, *q;
1.1 deraadt 164:
165: for (p = first_symbol; p; p = q)
166: {
167: q = p->next;
168: FREE(p);
169: }
170: }
![[BACK]](/icons/back.gif){kind=icon}
Return to symtab.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / yacc