62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
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/* Part of CPP library. (Macro hash table support.)
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Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* different kinds of things that can appear in the value field
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of a hash node. */
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union hashval
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{
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const char *cpval; /* some predefined macros */
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DEFINITION *defn; /* #define */
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struct hashnode *aschain; /* #assert */
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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 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 *cpp_install PARAMS ((cpp_reader *, U_CHAR *, int,
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enum node_type, const 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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extern MACRODEF create_definition PARAMS ((U_CHAR *, U_CHAR *,
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cpp_reader *, int));
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extern int compare_defs PARAMS ((cpp_reader *, DEFINITION *,
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DEFINITION *));
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extern void macroexpand PARAMS ((cpp_reader *, HASHNODE *));
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extern void dump_definition PARAMS ((cpp_reader *, MACRODEF));
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