41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/* different kinds of things that can appear in the value field
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of a hash node. Actually, this may be useless now. */
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union hashval {
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int ival;
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char *cpval;
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DEFINITION *defn;
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#if 0
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KEYDEF *keydef;
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#endif
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};
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struct hashnode {
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struct hashnode *next; /* double links for easy deletion */
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struct hashnode *prev;
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struct hashnode **bucket_hdr; /* also, a back pointer to this node's hash
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chain is kept, in case the node is the head
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of the chain and gets deleted. */
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enum node_type type; /* type of special token */
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int length; /* length of token, for quick comparison */
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U_CHAR *name; /* the actual name */
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union hashval value; /* pointer to expansion, or whatever */
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};
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typedef struct hashnode HASHNODE;
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/* Some definitions for the hash table. The hash function MUST be
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computed as shown in hashf () below. That is because the rescan
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loop computes the hash value `on the fly' for most tokens,
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in order to avoid the overhead of a lot of procedure calls to
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the hashf () function. Hashf () only exists for the sake of
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politeness, for use when speed isn't so important. */
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#define HASHSIZE 1403
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static HASHNODE *hashtab[HASHSIZE];
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#define HASHSTEP(old, c) ((old << 2) + c)
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#define MAKE_POS(v) (v & 0x7fffffff) /* make number positive */
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extern HASHNODE *install PARAMS ((U_CHAR *,int,enum node_type, int,char *,int));
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extern int hashf PARAMS ((const U_CHAR *, int, int));
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extern void delete_macro PARAMS ((HASHNODE *));
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