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1 | /* | |
2 | * QEMU 64-bit address ranges | |
3 | * | |
4 | * Copyright (c) 2015-2016 Red Hat, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "qemu/osdep.h" | |
21 | #include "qemu/range.h" | |
22 | ||
23 | /* | |
24 | * Return -1 if @a < @b, 1 @a > @b, and 0 if they touch or overlap. | |
25 | * Both @a and @b must not be empty. | |
26 | */ | |
27 | static inline int range_compare(Range *a, Range *b) | |
28 | { | |
29 | assert(!range_is_empty(a) && !range_is_empty(b)); | |
30 | ||
31 | /* Careful, avoid wraparound */ | |
32 | if (b->lob && b->lob - 1 > a->upb) { | |
33 | return -1; | |
34 | } | |
35 | if (a->lob && a->lob - 1 > b->upb) { | |
36 | return 1; | |
37 | } | |
38 | return 0; | |
39 | } | |
40 | ||
41 | /* Insert @data into @list of ranges; caller no longer owns @data */ | |
42 | GList *range_list_insert(GList *list, Range *data) | |
43 | { | |
44 | GList *l; | |
45 | ||
46 | assert(!range_is_empty(data)); | |
47 | ||
48 | /* Skip all list elements strictly less than data */ | |
49 | for (l = list; l && range_compare(l->data, data) < 0; l = l->next) { | |
50 | } | |
51 | ||
52 | if (!l || range_compare(l->data, data) > 0) { | |
53 | /* Rest of the list (if any) is strictly greater than @data */ | |
54 | return g_list_insert_before(list, l, data); | |
55 | } | |
56 | ||
57 | /* Current list element overlaps @data, merge the two */ | |
58 | range_extend(l->data, data); | |
59 | g_free(data); | |
60 | ||
61 | /* Merge any subsequent list elements that now also overlap */ | |
62 | while (l->next && range_compare(l->data, l->next->data) == 0) { | |
63 | GList *new_l; | |
64 | ||
65 | range_extend(l->data, l->next->data); | |
66 | g_free(l->next->data); | |
67 | new_l = g_list_delete_link(list, l->next); | |
68 | assert(new_l == list); | |
69 | } | |
70 | ||
71 | return list; | |
72 | } |