?? symtab.c
字號:
#include "defs.h"/* TABLE_SIZE is the number of entries in the symbol table. *//* TABLE_SIZE must be a power of two. */#define TABLE_SIZE 1024bucket **symbol_table;bucket *first_symbol;bucket *last_symbol;inthash(name)char *name;{ register char *s; register int c, k; assert(name && *name); s = name; k = *s; while (c = *++s) k = (31*k + c) & (TABLE_SIZE - 1); return (k);}bucket *make_bucket(name)char *name;{ register bucket *bp; assert(name); bp = (bucket *) MALLOC(sizeof(bucket)); if (bp == 0) no_space(); bp->link = 0; bp->next = 0; bp->name = MALLOC(strlen(name) + 1); if (bp->name == 0) no_space(); bp->tag = 0; bp->value = UNDEFINED; bp->index = 0; bp->prec = 0; bp-> class = UNKNOWN; bp->assoc = TOKEN; if (bp->name == 0) no_space(); strcpy(bp->name, name); return (bp);}bucket *lookup(name)char *name;{ register bucket *bp, **bpp; bpp = symbol_table + hash(name); bp = *bpp; while (bp) { if (strcmp(name, bp->name) == 0) return (bp); bpp = &bp->link; bp = *bpp; } *bpp = bp = make_bucket(name); last_symbol->next = bp; last_symbol = bp; return (bp);}create_symbol_table(){ register int i; register bucket *bp; symbol_table = (bucket **) MALLOC(TABLE_SIZE*sizeof(bucket *)); if (symbol_table == 0) no_space(); for (i = 0; i < TABLE_SIZE; i++) symbol_table[i] = 0; bp = make_bucket("error"); bp->index = 1; bp->class = TERM; first_symbol = bp; last_symbol = bp; symbol_table[hash("error")] = bp;}free_symbol_table(){ FREE(symbol_table); symbol_table = 0;}free_symbols(){ register bucket *p, *q; for (p = first_symbol; p; p = q) { q = p->next; FREE(p); }}
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