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118 lines
1.8 KiB
C
118 lines
1.8 KiB
C
/* $Id: symtab.c,v 1.10 2012/05/26 15:16:12 tom Exp $ */
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#include "defs.h"
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/* TABLE_SIZE is the number of entries in the symbol table. */
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/* TABLE_SIZE must be a power of two. */
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#define TABLE_SIZE 1024
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static bucket **symbol_table = 0;
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bucket *first_symbol;
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bucket *last_symbol;
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static int
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hash(const char *name)
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{
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const char *s;
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int c, k;
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assert(name && *name);
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s = name;
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k = *s;
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while ((c = *++s) != 0)
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k = (31 * k + c) & (TABLE_SIZE - 1);
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return (k);
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}
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bucket *
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make_bucket(const char *name)
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{
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bucket *bp;
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assert(name != 0);
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bp = TMALLOC(bucket, 1);
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NO_SPACE(bp);
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bp->link = 0;
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bp->next = 0;
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bp->name = TMALLOC(char, strlen(name) + 1);
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NO_SPACE(bp->name);
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bp->tag = 0;
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bp->value = UNDEFINED;
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bp->index = 0;
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bp->prec = 0;
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bp->class = UNKNOWN;
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bp->assoc = TOKEN;
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strcpy(bp->name, name);
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return (bp);
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}
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bucket *
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lookup(const char *name)
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{
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bucket *bp, **bpp;
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bpp = symbol_table + hash(name);
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bp = *bpp;
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while (bp)
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{
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if (strcmp(name, bp->name) == 0)
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return (bp);
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bpp = &bp->link;
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bp = *bpp;
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}
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*bpp = bp = make_bucket(name);
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last_symbol->next = bp;
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last_symbol = bp;
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return (bp);
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}
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void
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create_symbol_table(void)
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{
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int i;
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bucket *bp;
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symbol_table = TMALLOC(bucket *, TABLE_SIZE);
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NO_SPACE(symbol_table);
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for (i = 0; i < TABLE_SIZE; i++)
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symbol_table[i] = 0;
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bp = make_bucket("error");
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bp->index = 1;
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bp->class = TERM;
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first_symbol = bp;
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last_symbol = bp;
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symbol_table[hash("error")] = bp;
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}
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void
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free_symbol_table(void)
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{
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FREE(symbol_table);
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symbol_table = 0;
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}
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void
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free_symbols(void)
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{
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bucket *p, *q;
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for (p = first_symbol; p; p = q)
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{
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q = p->next;
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FREE(p);
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}
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}
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