2 Copyright (C) 2004-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
35 /* Calculate the new ALLOC value, making sure that abs(RESERVE) slots
36 are free. If RESERVE < 0 grow exactly, otherwise grow
39 static inline unsigned
40 calculate_allocation (const struct vec_prefix *pfx, int reserve)
51 /* If there's no prefix, and we've not requested anything, then we
52 will create a NULL vector. */
55 /* We must have run out of room. */
56 gdb_assert (alloc - num < (unsigned)(reserve < 0 ? -reserve : reserve));
60 alloc = num + -reserve;
63 /* Exponential growth. */
67 /* Double when small. */
70 /* Grow slower when large. */
71 alloc = (alloc * 3 / 2);
73 /* If this is still too small, set it to the right size. */
74 if (alloc < num + reserve)
75 alloc = num + reserve;
80 /* Ensure there are at least abs(RESERVE) free slots in VEC. If
81 RESERVE < 0 grow exactly, else grow exponentially. As a special
82 case, if VEC is NULL, and RESERVE is 0, no vector will be created. */
85 vec_p_reserve (void *vec, int reserve)
87 return vec_o_reserve (vec, reserve,
88 offsetof (struct vec_prefix, vec), sizeof (void *));
91 /* As vec_p_reserve, but for object vectors. The vector's trailing
92 array is at VEC_OFFSET offset and consists of ELT_SIZE sized
96 vec_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size)
98 struct vec_prefix *pfx = vec;
99 unsigned alloc = calculate_allocation (pfx, reserve);
104 vec = xrealloc (vec, vec_offset + alloc * elt_size);
105 ((struct vec_prefix *)vec)->alloc = alloc;
107 ((struct vec_prefix *)vec)->num = 0;
119 typedef obj_t *ptr_t;