2 Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
3 Contributed by Nathan Sidwell <nathan@codesourcery.com>
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
32 /* Calculate the new ALLOC value, making sure that abs(RESERVE) slots
33 are free. If RESERVE < 0 grow exactly, otherwise grow
36 static inline unsigned
37 calculate_allocation (const struct vec_prefix *pfx, int reserve)
48 /* If there's no prefix, and we've not requested anything, then we
49 will create a NULL vector. */
52 /* We must have run out of room. */
53 gdb_assert (alloc - num < (unsigned)(reserve < 0 ? -reserve : reserve));
57 alloc = num + -reserve;
60 /* Exponential growth. */
64 /* Double when small. */
67 /* Grow slower when large. */
68 alloc = (alloc * 3 / 2);
70 /* If this is still too small, set it to the right size. */
71 if (alloc < num + reserve)
72 alloc = num + reserve;
77 /* Ensure there are at least abs(RESERVE) free slots in VEC. If
78 RESERVE < 0 grow exactly, else grow exponentially. As a special
79 case, if VEC is NULL, and RESERVE is 0, no vector will be created. */
82 vec_p_reserve (void *vec, int reserve)
84 return vec_o_reserve (vec, reserve,
85 offsetof (struct vec_prefix, vec), sizeof (void *));
88 /* As vec_p_reserve, but for object vectors. The vector's trailing
89 array is at VEC_OFFSET offset and consists of ELT_SIZE sized
93 vec_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size)
95 struct vec_prefix *pfx = vec;
96 unsigned alloc = calculate_allocation (pfx, reserve);
101 vec = xrealloc (vec, vec_offset + alloc * elt_size);
102 ((struct vec_prefix *)vec)->alloc = alloc;
104 ((struct vec_prefix *)vec)->num = 0;
116 typedef obj_t *ptr_t;