| 1 | /* GNU m4 -- A simple macro processor
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| 2 |
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| 3 | Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 2003, 2006 Free
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| 4 | Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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| 19 | 02110-1301 USA
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| 20 | */
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| 21 |
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| 22 | /* This file handles all the low level work around the symbol table. The
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| 23 | symbol table is a simple chained hash table. Each symbol is described
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| 24 | by a struct symbol, which is placed in the hash table based upon the
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| 25 | symbol name. Symbols that hash to the same entry in the table are
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| 26 | kept on a list, sorted by name. As a special case, to facilitate the
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| 27 | "pushdef" and "popdef" builtins, a symbol can be several times in the
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| 28 | symbol table, one for each definition. Since the name is the same,
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| 29 | all the entries for the symbol will be on the same list, and will
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| 30 | also, because the list is sorted, be adjacent. All the entries for a
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| 31 | name are simply ordered on the list by age. The current definition
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| 32 | will then always be the first found. */
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| 33 |
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| 34 | #include "m4.h"
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| 35 | #include <limits.h>
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| 36 |
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| 37 | #ifdef DEBUG_SYM
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| 38 | /* When evaluating hash table performance, this profiling code shows
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| 39 | how many collisions were encountered. */
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| 40 |
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| 41 | struct profile
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