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c906108c | 1 | /* Address ranges. |
42a4f53d | 2 | Copyright (C) 1998-2019 Free Software Foundation, Inc. |
c906108c SS |
3 | Contributed by Cygnus Solutions. |
4 | ||
5 | This file is part of the GNU Simulators. | |
6 | ||
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 | |
4744ac1b JB |
9 | the Free Software Foundation; either version 3 of the License, or |
10 | (at your option) any later version. | |
c906108c SS |
11 | |
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. | |
16 | ||
4744ac1b JB |
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/>. */ | |
c906108c SS |
19 | |
20 | /* Tell sim-arange.h it's us. */ | |
21 | #define SIM_ARANGE_C | |
22 | ||
23 | #include "libiberty.h" | |
24 | #include "sim-basics.h" | |
25 | #include "sim-assert.h" | |
26 | ||
27 | #ifdef HAVE_STDLIB_H | |
28 | #include <stdlib.h> | |
29 | #endif | |
30 | ||
c4093a6a JM |
31 | #ifdef HAVE_STRING_H |
32 | #include <string.h> | |
33 | #endif | |
34 | ||
7516c26f | 35 | #ifdef SIM_ARANGE_C_INCLUDED |
c906108c SS |
36 | |
37 | /* Insert a range. */ | |
38 | ||
39 | static void | |
40 | insert_range (ADDR_SUBRANGE **pos, ADDR_SUBRANGE *asr) | |
41 | { | |
42 | asr->next = *pos; | |
43 | *pos = asr; | |
44 | } | |
45 | ||
46 | /* Delete a range. */ | |
47 | ||
48 | static void | |
49 | delete_range (ADDR_SUBRANGE **thisasrp) | |
50 | { | |
51 | ADDR_SUBRANGE *thisasr; | |
52 | ||
53 | thisasr = *thisasrp; | |
54 | *thisasrp = thisasr->next; | |
55 | ||
56 | free (thisasr); | |
57 | } | |
58 | ||
59 | /* Add or delete an address range. | |
60 | This code was borrowed from linux's locks.c:posix_lock_file(). | |
61 | ??? Todo: Given our simpler needs this could be simplified | |
62 | (split into two fns). */ | |
63 | ||
64 | static void | |
65 | frob_range (ADDR_RANGE *ar, address_word start, address_word end, int delete_p) | |
66 | { | |
67 | ADDR_SUBRANGE *asr; | |
68 | ADDR_SUBRANGE *new_asr, *new_asr2; | |
69 | ADDR_SUBRANGE *left = NULL; | |
70 | ADDR_SUBRANGE *right = NULL; | |
71 | ADDR_SUBRANGE **before; | |
72 | ADDR_SUBRANGE init_caller; | |
73 | ADDR_SUBRANGE *caller = &init_caller; | |
74 | int added_p = 0; | |
75 | ||
76 | memset (caller, 0, sizeof (ADDR_SUBRANGE)); | |
77 | new_asr = ZALLOC (ADDR_SUBRANGE); | |
78 | new_asr2 = ZALLOC (ADDR_SUBRANGE); | |
79 | ||
80 | caller->start = start; | |
81 | caller->end = end; | |
82 | before = &ar->ranges; | |
83 | ||
84 | while ((asr = *before) != NULL) | |
85 | { | |
86 | if (! delete_p) | |
87 | { | |
88 | /* Try next range if current range preceeds new one and not | |
89 | adjacent or overlapping. */ | |
90 | if (asr->end < caller->start - 1) | |
91 | goto next_range; | |
92 | ||
93 | /* Break out if new range preceeds current one and not | |
94 | adjacent or overlapping. */ | |
95 | if (asr->start > caller->end + 1) | |
96 | break; | |
97 | ||
98 | /* If we come here, the new and current ranges are adjacent or | |
99 | overlapping. Make one range yielding from the lower start address | |
100 | of both ranges to the higher end address. */ | |
101 | if (asr->start > caller->start) | |
102 | asr->start = caller->start; | |
103 | else | |
104 | caller->start = asr->start; | |
105 | if (asr->end < caller->end) | |
106 | asr->end = caller->end; | |
107 | else | |
108 | caller->end = asr->end; | |
109 | ||
110 | if (added_p) | |
111 | { | |
112 | delete_range (before); | |
113 | continue; | |
114 | } | |
115 | caller = asr; | |
116 | added_p = 1; | |
117 | } | |
118 | else /* deleting a range */ | |
119 | { | |
120 | /* Try next range if current range preceeds new one. */ | |
121 | if (asr->end < caller->start) | |
122 | goto next_range; | |
123 | ||
124 | /* Break out if new range preceeds current one. */ | |
125 | if (asr->start > caller->end) | |
126 | break; | |
127 | ||
128 | added_p = 1; | |
129 | ||
130 | if (asr->start < caller->start) | |
131 | left = asr; | |
132 | ||
133 | /* If the next range in the list has a higher end | |
134 | address than the new one, insert the new one here. */ | |
135 | if (asr->end > caller->end) | |
136 | { | |
137 | right = asr; | |
138 | break; | |
139 | } | |
140 | if (asr->start >= caller->start) | |
141 | { | |
142 | /* The new range completely replaces an old | |
143 | one (This may happen several times). */ | |
144 | if (added_p) | |
145 | { | |
146 | delete_range (before); | |
147 | continue; | |
148 | } | |
149 | ||
150 | /* Replace the old range with the new one. */ | |
151 | asr->start = caller->start; | |
152 | asr->end = caller->end; | |
153 | caller = asr; | |
154 | added_p = 1; | |
155 | } | |
156 | } | |
157 | ||
158 | /* Go on to next range. */ | |
159 | next_range: | |
160 | before = &asr->next; | |
161 | } | |
162 | ||
163 | if (!added_p) | |
164 | { | |
165 | if (delete_p) | |
166 | goto out; | |
167 | new_asr->start = caller->start; | |
168 | new_asr->end = caller->end; | |
169 | insert_range (before, new_asr); | |
170 | new_asr = NULL; | |
171 | } | |
172 | if (right) | |
173 | { | |
174 | if (left == right) | |
175 | { | |
176 | /* The new range breaks the old one in two pieces, | |
177 | so we have to use the second new range. */ | |
178 | new_asr2->start = right->start; | |
179 | new_asr2->end = right->end; | |
180 | left = new_asr2; | |
181 | insert_range (before, left); | |
182 | new_asr2 = NULL; | |
183 | } | |
184 | right->start = caller->end + 1; | |
185 | } | |
186 | if (left) | |
187 | { | |
188 | left->end = caller->start - 1; | |
189 | } | |
190 | ||
191 | out: | |
192 | if (new_asr) | |
34b47c38 | 193 | free (new_asr); |
c906108c | 194 | if (new_asr2) |
34b47c38 | 195 | free (new_asr2); |
c906108c SS |
196 | } |
197 | ||
198 | /* Free T and all subtrees. */ | |
199 | ||
200 | static void | |
201 | free_search_tree (ADDR_RANGE_TREE *t) | |
202 | { | |
203 | if (t != NULL) | |
204 | { | |
205 | free_search_tree (t->lower); | |
206 | free_search_tree (t->higher); | |
207 | free (t); | |
208 | } | |
209 | } | |
210 | ||
211 | /* Subroutine of build_search_tree to recursively build a balanced tree. | |
212 | ??? It's not an optimum tree though. */ | |
213 | ||
214 | static ADDR_RANGE_TREE * | |
215 | build_tree_1 (ADDR_SUBRANGE **asrtab, unsigned int n) | |
216 | { | |
217 | unsigned int mid = n / 2; | |
218 | ADDR_RANGE_TREE *t; | |
219 | ||
220 | if (n == 0) | |
221 | return NULL; | |
222 | t = (ADDR_RANGE_TREE *) xmalloc (sizeof (ADDR_RANGE_TREE)); | |
223 | t->start = asrtab[mid]->start; | |
224 | t->end = asrtab[mid]->end; | |
225 | if (mid != 0) | |
226 | t->lower = build_tree_1 (asrtab, mid); | |
227 | else | |
228 | t->lower = NULL; | |
229 | if (n > mid + 1) | |
230 | t->higher = build_tree_1 (asrtab + mid + 1, n - mid - 1); | |
231 | else | |
232 | t->higher = NULL; | |
233 | return t; | |
234 | } | |
235 | ||
236 | /* Build a search tree for address range AR. */ | |
237 | ||
238 | static void | |
239 | build_search_tree (ADDR_RANGE *ar) | |
240 | { | |
241 | /* ??? Simple version for now. */ | |
242 | ADDR_SUBRANGE *asr,**asrtab; | |
243 | unsigned int i, n; | |
244 | ||
245 | for (n = 0, asr = ar->ranges; asr != NULL; ++n, asr = asr->next) | |
246 | continue; | |
247 | asrtab = (ADDR_SUBRANGE **) xmalloc (n * sizeof (ADDR_SUBRANGE *)); | |
248 | for (i = 0, asr = ar->ranges; i < n; ++i, asr = asr->next) | |
249 | asrtab[i] = asr; | |
250 | ar->range_tree = build_tree_1 (asrtab, n); | |
251 | free (asrtab); | |
252 | } | |
253 | ||
254 | void | |
255 | sim_addr_range_add (ADDR_RANGE *ar, address_word start, address_word end) | |
256 | { | |
257 | frob_range (ar, start, end, 0); | |
258 | ||
259 | /* Rebuild the search tree. */ | |
260 | /* ??? Instead of rebuilding it here it could be done in a module resume | |
261 | handler, say by first checking for a `changed' flag, assuming of course | |
262 | this would never be done while the simulation is running. */ | |
263 | free_search_tree (ar->range_tree); | |
264 | build_search_tree (ar); | |
265 | } | |
266 | ||
267 | void | |
268 | sim_addr_range_delete (ADDR_RANGE *ar, address_word start, address_word end) | |
269 | { | |
270 | frob_range (ar, start, end, 1); | |
271 | ||
272 | /* Rebuild the search tree. */ | |
273 | /* ??? Instead of rebuilding it here it could be done in a module resume | |
274 | handler, say by first checking for a `changed' flag, assuming of course | |
275 | this would never be done while the simulation is running. */ | |
276 | free_search_tree (ar->range_tree); | |
277 | build_search_tree (ar); | |
278 | } | |
279 | ||
7516c26f | 280 | #else /* SIM_ARANGE_C_INCLUDED */ |
c906108c SS |
281 | |
282 | SIM_ARANGE_INLINE int | |
283 | sim_addr_range_hit_p (ADDR_RANGE *ar, address_word addr) | |
284 | { | |
285 | ADDR_RANGE_TREE *t = ar->range_tree; | |
286 | ||
287 | while (t != NULL) | |
288 | { | |
289 | if (addr < t->start) | |
290 | t = t->lower; | |
291 | else if (addr > t->end) | |
292 | t = t->higher; | |
293 | else | |
294 | return 1; | |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
7516c26f | 299 | #endif /* SIM_ARANGE_C_INCLUDED */ |