1 | /* |
1 | /* |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
3 | * |
3 | * |
4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
5 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * it under the terms of the GNU General Public License as published by |
7 | * the terms of the Affero GNU General Public License as published by the |
8 | * the Free Software Foundation, either version 3 of the License, or |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * (at your option) any later version. |
9 | * option) any later version. |
10 | * |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
14 | * GNU General Public License for more details. |
15 | * |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
18 | * |
19 | * |
19 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | */ |
21 | */ |
21 | |
22 | |
22 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
23 | #define UTIL_H__ |
24 | #define UTIL_H__ |
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25 | |
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26 | #include <compiler.h> |
24 | |
27 | |
25 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
28 | |
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29 | #if __GNUC__ >= 3 |
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30 | # define is_constant(c) __builtin_constant_p (c) |
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31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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33 | #else |
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34 | # define is_constant(c) 0 |
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35 | # define expect(expr,value) (expr) |
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36 | # define prefetch(addr,rw,locality) |
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37 | #endif |
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38 | |
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39 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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40 | # define decltype(x) typeof(x) |
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41 | #endif |
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42 | |
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43 | // put into ifs if you are very sure that the expression |
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44 | // is mostly true or mosty false. note that these return |
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45 | // booleans, not the expression. |
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46 | #define expect_false(expr) expect ((expr) != 0, 0) |
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47 | #define expect_true(expr) expect ((expr) != 0, 1) |
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48 | |
31 | |
49 | #include <pthread.h> |
32 | #include <pthread.h> |
50 | |
33 | |
51 | #include <cstddef> |
34 | #include <cstddef> |
52 | #include <cmath> |
35 | #include <cmath> |
… | |
… | |
72 | #endif |
55 | #endif |
73 | |
56 | |
74 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
75 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
76 | |
59 | |
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60 | #if cplusplus_does_not_suck /* still sucks in codesize with gcc 6, although local types work now */ |
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61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
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62 | template<typename T, int N> |
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63 | static inline int array_length (const T (&arr)[N]) |
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64 | { |
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65 | return N; |
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66 | } |
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67 | #else |
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68 | #define array_length(name) (sizeof (name) / sizeof (name [0])) |
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69 | #endif |
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70 | |
77 | // very ugly macro that basically declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
78 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
79 | // works only for stuff that can be assigned 0 and converts to false |
73 | // works only for stuff that can be assigned 0 and converts to false |
80 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
81 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
… | |
… | |
92 | void cleanup (const char *cause, bool make_core = false); |
86 | void cleanup (const char *cause, bool make_core = false); |
93 | void fork_abort (const char *msg); |
87 | void fork_abort (const char *msg); |
94 | |
88 | |
95 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
89 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
96 | // as a is often a constant while b is the variable. it is still a bug, though. |
90 | // as a is often a constant while b is the variable. it is still a bug, though. |
97 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
91 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
98 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
92 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
99 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
93 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
100 | |
94 | |
101 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
102 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
103 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
97 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
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110 | // sign returns -1 or +1 |
104 | // sign returns -1 or +1 |
111 | template<typename T> |
105 | template<typename T> |
112 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
113 | // relies on 2c representation |
107 | // relies on 2c representation |
114 | template<> |
108 | template<> |
115 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
109 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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110 | template<> |
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111 | inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); } |
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112 | template<> |
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113 | inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); } |
116 | |
114 | |
117 | // sign0 returns -1, 0 or +1 |
115 | // sign0 returns -1, 0 or +1 |
118 | template<typename T> |
116 | template<typename T> |
119 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
120 | |
118 | |
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119 | //clashes with C++0x |
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120 | template<typename T, typename U> |
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121 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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122 | |
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123 | // div* only work correctly for div > 0 |
121 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
124 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
122 | template<typename T> static inline T div (T val, T div) { return (val + div / 2) / div; } |
125 | template<typename T> static inline T div (T val, T div) |
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126 | { |
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127 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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128 | } |
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129 | |
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130 | template<> inline float div (float val, float div) { return val / div; } |
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131 | template<> inline double div (double val, double div) { return val / div; } |
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132 | |
123 | // div, round-up |
133 | // div, round-up |
124 | template<typename T> static inline T div_ru (T val, T div) { return (val + div - 1) / div; } |
134 | template<typename T> static inline T div_ru (T val, T div) |
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135 | { |
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136 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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137 | } |
125 | // div, round-down |
138 | // div, round-down |
126 | template<typename T> static inline T div_rd (T val, T div) { return (val ) / div; } |
139 | template<typename T> static inline T div_rd (T val, T div) |
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140 | { |
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141 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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142 | } |
127 | |
143 | |
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144 | // lerp* only work correctly for min_in < max_in |
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145 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
128 | template<typename T> |
146 | template<typename T> |
129 | static inline T |
147 | static inline T |
130 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
148 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
131 | { |
149 | { |
132 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
150 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
… | |
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191 | int32_t d = b - a; |
209 | int32_t d = b - a; |
192 | d &= d >> 31; |
210 | d &= d >> 31; |
193 | return b - d; |
211 | return b - d; |
194 | } |
212 | } |
195 | |
213 | |
196 | // this is much faster than crossfires original algorithm |
214 | // this is much faster than crossfire's original algorithm |
197 | // on modern cpus |
215 | // on modern cpus |
198 | inline int |
216 | inline int |
199 | isqrt (int n) |
217 | isqrt (int n) |
200 | { |
218 | { |
201 | return (int)sqrtf ((float)n); |
219 | return (int)sqrtf ((float)n); |
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220 | } |
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221 | |
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222 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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223 | // more handy than it looks like, due to the implicit !! done on its arguments |
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224 | inline bool |
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225 | logical_xor (bool a, bool b) |
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226 | { |
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227 | return a != b; |
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228 | } |
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229 | |
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230 | inline bool |
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231 | logical_implies (bool a, bool b) |
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232 | { |
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233 | return a <= b; |
202 | } |
234 | } |
203 | |
235 | |
204 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
236 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
205 | #if 0 |
237 | #if 0 |
206 | // and has a max. error of 6 in the range -100..+100. |
238 | // and has a max. error of 6 in the range -100..+100. |
207 | #else |
239 | #else |
208 | // and has a max. error of 9 in the range -100..+100. |
240 | // and has a max. error of 9 in the range -100..+100. |
209 | #endif |
241 | #endif |
210 | inline int |
242 | inline int |
211 | idistance (int dx, int dy) |
243 | idistance (int dx, int dy) |
212 | { |
244 | { |
213 | unsigned int dx_ = abs (dx); |
245 | unsigned int dx_ = abs (dx); |
214 | unsigned int dy_ = abs (dy); |
246 | unsigned int dy_ = abs (dy); |
215 | |
247 | |
216 | #if 0 |
248 | #if 0 |
217 | return dx_ > dy_ |
249 | return dx_ > dy_ |
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220 | #else |
252 | #else |
221 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
253 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
222 | #endif |
254 | #endif |
223 | } |
255 | } |
224 | |
256 | |
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257 | // can be substantially faster than floor, if your value range allows for it |
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258 | template<typename T> |
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259 | inline T |
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260 | fastfloor (T x) |
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261 | { |
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262 | return std::floor (x); |
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263 | } |
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264 | |
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265 | inline float |
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266 | fastfloor (float x) |
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267 | { |
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268 | return sint32(x) - (x < 0); |
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269 | } |
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270 | |
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271 | inline double |
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272 | fastfloor (double x) |
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273 | { |
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274 | return sint64(x) - (x < 0); |
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275 | } |
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276 | |
225 | /* |
277 | /* |
226 | * absdir(int): Returns a number between 1 and 8, which represent |
278 | * absdir(int): Returns a number between 1 and 8, which represent |
227 | * the "absolute" direction of a number (it actually takes care of |
279 | * the "absolute" direction of a number (it actually takes care of |
228 | * "overflow" in previous calculations of a direction). |
280 | * "overflow" in previous calculations of a direction). |
229 | */ |
281 | */ |
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231 | absdir (int d) |
283 | absdir (int d) |
232 | { |
284 | { |
233 | return ((d - 1) & 7) + 1; |
285 | return ((d - 1) & 7) + 1; |
234 | } |
286 | } |
235 | |
287 | |
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288 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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289 | #if GCC_VERSION(3,4) |
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290 | static inline int least_significant_bit (uint32_t x) |
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291 | { |
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292 | return __builtin_ctz (x); |
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293 | } |
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294 | #else |
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295 | int least_significant_bit (uint32_t x); |
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296 | #endif |
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297 | |
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298 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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299 | for (uint32_t idxvar, mask_ = mask; \ |
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300 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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301 | |
236 | extern ssize_t slice_alloc; // statistics |
302 | extern ssize_t slice_alloc; // statistics |
237 | |
303 | |
238 | void *salloc_ (int n) throw (std::bad_alloc); |
304 | void *salloc_ (int n); |
239 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
305 | void *salloc_ (int n, void *src); |
240 | |
306 | |
241 | // strictly the same as g_slice_alloc, but never returns 0 |
307 | // strictly the same as g_slice_alloc, but never returns 0 |
242 | template<typename T> |
308 | template<typename T> |
243 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
309 | inline T *salloc (int n = 1) { return (T *)salloc_ (n * sizeof (T)); } |
244 | |
310 | |
245 | // also copies src into the new area, like "memdup" |
311 | // also copies src into the new area, like "memdup" |
246 | // if src is 0, clears the memory |
312 | // if src is 0, clears the memory |
247 | template<typename T> |
313 | template<typename T> |
248 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
314 | inline T *salloc (int n, T *src) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
249 | |
315 | |
250 | // clears the memory |
316 | // clears the memory |
251 | template<typename T> |
317 | template<typename T> |
252 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
318 | inline T *salloc0(int n = 1) { return (T *)salloc_ (n * sizeof (T), 0); } |
253 | |
319 | |
254 | // for symmetry |
320 | // for symmetry |
255 | template<typename T> |
321 | template<typename T> |
256 | inline void sfree (T *ptr, int n = 1) throw () |
322 | inline void sfree (T *ptr, int n = 1) noexcept |
257 | { |
323 | { |
258 | if (expect_true (ptr)) |
324 | if (expect_true (ptr)) |
259 | { |
325 | { |
260 | slice_alloc -= n * sizeof (T); |
326 | slice_alloc -= n * sizeof (T); |
261 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
327 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
262 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
328 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
263 | assert (slice_alloc >= 0);//D |
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264 | } |
329 | } |
265 | } |
330 | } |
266 | |
331 | |
267 | // nulls the pointer |
332 | // nulls the pointer |
268 | template<typename T> |
333 | template<typename T> |
269 | inline void sfree0 (T *&ptr, int n = 1) throw () |
334 | inline void sfree0 (T *&ptr, int n = 1) noexcept |
270 | { |
335 | { |
271 | sfree<T> (ptr, n); |
336 | sfree<T> (ptr, n); |
272 | ptr = 0; |
337 | ptr = 0; |
273 | } |
338 | } |
274 | |
339 | |
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… | |
342 | typedef const Tp *const_pointer; |
407 | typedef const Tp *const_pointer; |
343 | typedef Tp &reference; |
408 | typedef Tp &reference; |
344 | typedef const Tp &const_reference; |
409 | typedef const Tp &const_reference; |
345 | typedef Tp value_type; |
410 | typedef Tp value_type; |
346 | |
411 | |
347 | template <class U> |
412 | template <class U> |
348 | struct rebind |
413 | struct rebind |
349 | { |
414 | { |
350 | typedef slice_allocator<U> other; |
415 | typedef slice_allocator<U> other; |
351 | }; |
416 | }; |
352 | |
417 | |
353 | slice_allocator () throw () { } |
418 | slice_allocator () noexcept { } |
354 | slice_allocator (const slice_allocator &) throw () { } |
419 | slice_allocator (const slice_allocator &) noexcept { } |
355 | template<typename Tp2> |
420 | template<typename Tp2> |
356 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
421 | slice_allocator (const slice_allocator<Tp2> &) noexcept { } |
357 | |
422 | |
358 | ~slice_allocator () { } |
423 | ~slice_allocator () { } |
359 | |
424 | |
360 | pointer address (reference x) const { return &x; } |
425 | pointer address (reference x) const { return &x; } |
361 | const_pointer address (const_reference x) const { return &x; } |
426 | const_pointer address (const_reference x) const { return &x; } |
… | |
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368 | void deallocate (pointer p, size_type n) |
433 | void deallocate (pointer p, size_type n) |
369 | { |
434 | { |
370 | sfree<Tp> (p, n); |
435 | sfree<Tp> (p, n); |
371 | } |
436 | } |
372 | |
437 | |
373 | size_type max_size () const throw () |
438 | size_type max_size () const noexcept |
374 | { |
439 | { |
375 | return size_t (-1) / sizeof (Tp); |
440 | return size_t (-1) / sizeof (Tp); |
376 | } |
441 | } |
377 | |
442 | |
378 | void construct (pointer p, const Tp &val) |
443 | void construct (pointer p, const Tp &val) |
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384 | { |
449 | { |
385 | p->~Tp (); |
450 | p->~Tp (); |
386 | } |
451 | } |
387 | }; |
452 | }; |
388 | |
453 | |
389 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
454 | // basically a memory area, but refcounted |
390 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
455 | struct refcnt_buf |
391 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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392 | struct tausworthe_random_generator |
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393 | { |
456 | { |
394 | uint32_t state [4]; |
457 | char *data; |
395 | |
458 | |
396 | void operator =(const tausworthe_random_generator &src) |
459 | refcnt_buf (size_t size = 0); |
397 | { |
460 | refcnt_buf (void *data, size_t size); |
398 | state [0] = src.state [0]; |
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399 | state [1] = src.state [1]; |
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400 | state [2] = src.state [2]; |
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401 | state [3] = src.state [3]; |
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402 | } |
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403 | |
461 | |
404 | void seed (uint32_t seed); |
462 | refcnt_buf (const refcnt_buf &src) |
405 | uint32_t next (); |
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406 | }; |
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407 | |
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408 | // Xorshift RNGs, George Marsaglia |
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409 | // http://www.jstatsoft.org/v08/i14/paper |
|
|
410 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
|
|
411 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
|
|
412 | struct xorshift_random_generator |
|
|
413 | { |
|
|
414 | uint32_t x, y; |
|
|
415 | |
|
|
416 | void operator =(const xorshift_random_generator &src) |
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|
417 | { |
463 | { |
418 | x = src.x; |
464 | data = src.data; |
419 | y = src.y; |
465 | inc (); |
420 | } |
466 | } |
421 | |
467 | |
422 | void seed (uint32_t seed) |
468 | ~refcnt_buf (); |
423 | { |
|
|
424 | x = seed; |
|
|
425 | y = seed * 69069U; |
|
|
426 | } |
|
|
427 | |
469 | |
428 | uint32_t next () |
470 | refcnt_buf &operator =(const refcnt_buf &src); |
|
|
471 | |
|
|
472 | operator char *() |
429 | { |
473 | { |
430 | uint32_t t = x ^ (x << 10); |
|
|
431 | x = y; |
|
|
432 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
|
|
433 | return y; |
474 | return data; |
434 | } |
475 | } |
435 | }; |
|
|
436 | |
476 | |
437 | template<class generator> |
477 | size_t size () const |
438 | struct random_number_generator : generator |
|
|
439 | { |
|
|
440 | // uniform distribution, 0 .. max (0, num - 1) |
|
|
441 | uint32_t operator ()(uint32_t num) |
|
|
442 | { |
478 | { |
443 | return !is_constant (num) ? get_range (num) // non-constant |
479 | return _size (); |
444 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
|
|
445 | : this->next () & (num - 1); // constant, power-of-two |
|
|
446 | } |
|
|
447 | |
|
|
448 | // return a number within (min .. max) |
|
|
449 | int operator () (int r_min, int r_max) |
|
|
450 | { |
|
|
451 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
|
|
452 | ? r_min + operator ()(r_max - r_min + 1) |
|
|
453 | : get_range (r_min, r_max); |
|
|
454 | } |
|
|
455 | |
|
|
456 | double operator ()() |
|
|
457 | { |
|
|
458 | return this->next () / (double)0xFFFFFFFFU; |
|
|
459 | } |
480 | } |
460 | |
481 | |
461 | protected: |
482 | protected: |
462 | uint32_t get_range (uint32_t r_max); |
483 | enum { |
463 | int get_range (int r_min, int r_max); |
484 | overhead = sizeof (uint32_t) * 2 |
464 | }; |
485 | }; |
465 | |
486 | |
466 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
487 | uint32_t &_size () const |
|
|
488 | { |
|
|
489 | return ((unsigned int *)data)[-2]; |
|
|
490 | } |
467 | |
491 | |
468 | extern rand_gen rndm, rmg_rndm; |
492 | uint32_t &_refcnt () const |
|
|
493 | { |
|
|
494 | return ((unsigned int *)data)[-1]; |
|
|
495 | } |
|
|
496 | |
|
|
497 | void _alloc (uint32_t size) |
|
|
498 | { |
|
|
499 | data = ((char *)salloc<char> (size + overhead)) + overhead; |
|
|
500 | _size () = size; |
|
|
501 | _refcnt () = 1; |
|
|
502 | } |
|
|
503 | |
|
|
504 | void _dealloc (); |
|
|
505 | |
|
|
506 | void inc () |
|
|
507 | { |
|
|
508 | ++_refcnt (); |
|
|
509 | } |
|
|
510 | |
|
|
511 | void dec () |
|
|
512 | { |
|
|
513 | if (!--_refcnt ()) |
|
|
514 | _dealloc (); |
|
|
515 | } |
|
|
516 | }; |
469 | |
517 | |
470 | INTERFACE_CLASS (attachable) |
518 | INTERFACE_CLASS (attachable) |
471 | struct refcnt_base |
519 | struct refcnt_base |
472 | { |
520 | { |
473 | typedef int refcnt_t; |
521 | typedef int refcnt_t; |
… | |
… | |
535 | typedef refptr<maptile> maptile_ptr; |
583 | typedef refptr<maptile> maptile_ptr; |
536 | typedef refptr<object> object_ptr; |
584 | typedef refptr<object> object_ptr; |
537 | typedef refptr<archetype> arch_ptr; |
585 | typedef refptr<archetype> arch_ptr; |
538 | typedef refptr<client> client_ptr; |
586 | typedef refptr<client> client_ptr; |
539 | typedef refptr<player> player_ptr; |
587 | typedef refptr<player> player_ptr; |
|
|
588 | typedef refptr<region> region_ptr; |
|
|
589 | |
|
|
590 | #define STRHSH_NULL 2166136261 |
|
|
591 | |
|
|
592 | static inline uint32_t |
|
|
593 | strhsh (const char *s) |
|
|
594 | { |
|
|
595 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
596 | // it is about twice as fast as the one-at-a-time one, |
|
|
597 | // with good distribution. |
|
|
598 | // FNV-1a is faster on many cpus because the multiplication |
|
|
599 | // runs concurrently with the looping logic. |
|
|
600 | // we modify the hash a bit to improve its distribution |
|
|
601 | uint32_t hash = STRHSH_NULL; |
|
|
602 | |
|
|
603 | while (*s) |
|
|
604 | hash = (hash ^ *s++) * 16777619U; |
|
|
605 | |
|
|
606 | return hash ^ (hash >> 16); |
|
|
607 | } |
|
|
608 | |
|
|
609 | static inline uint32_t |
|
|
610 | memhsh (const char *s, size_t len) |
|
|
611 | { |
|
|
612 | uint32_t hash = STRHSH_NULL; |
|
|
613 | |
|
|
614 | while (len--) |
|
|
615 | hash = (hash ^ *s++) * 16777619U; |
|
|
616 | |
|
|
617 | return hash; |
|
|
618 | } |
540 | |
619 | |
541 | struct str_hash |
620 | struct str_hash |
542 | { |
621 | { |
543 | std::size_t operator ()(const char *s) const |
622 | std::size_t operator ()(const char *s) const |
544 | { |
623 | { |
545 | unsigned long hash = 0; |
|
|
546 | |
|
|
547 | /* use the one-at-a-time hash function, which supposedly is |
|
|
548 | * better than the djb2-like one used by perl5.005, but |
|
|
549 | * certainly is better then the bug used here before. |
|
|
550 | * see http://burtleburtle.net/bob/hash/doobs.html |
|
|
551 | */ |
|
|
552 | while (*s) |
|
|
553 | { |
|
|
554 | hash += *s++; |
|
|
555 | hash += hash << 10; |
|
|
556 | hash ^= hash >> 6; |
|
|
557 | } |
|
|
558 | |
|
|
559 | hash += hash << 3; |
|
|
560 | hash ^= hash >> 11; |
|
|
561 | hash += hash << 15; |
|
|
562 | |
|
|
563 | return hash; |
624 | return strhsh (s); |
|
|
625 | } |
|
|
626 | |
|
|
627 | std::size_t operator ()(const shstr &s) const |
|
|
628 | { |
|
|
629 | return strhsh (s); |
564 | } |
630 | } |
565 | }; |
631 | }; |
566 | |
632 | |
567 | struct str_equal |
633 | struct str_equal |
568 | { |
634 | { |
… | |
… | |
595 | } |
661 | } |
596 | }; |
662 | }; |
597 | |
663 | |
598 | // This container blends advantages of linked lists |
664 | // This container blends advantages of linked lists |
599 | // (efficiency) with vectors (random access) by |
665 | // (efficiency) with vectors (random access) by |
600 | // by using an unordered vector and storing the vector |
666 | // using an unordered vector and storing the vector |
601 | // index inside the object. |
667 | // index inside the object. |
602 | // |
668 | // |
603 | // + memory-efficient on most 64 bit archs |
669 | // + memory-efficient on most 64 bit archs |
604 | // + O(1) insert/remove |
670 | // + O(1) insert/remove |
605 | // + free unique (but varying) id for inserted objects |
671 | // + free unique (but varying) id for inserted objects |
… | |
… | |
642 | insert (&obj); |
708 | insert (&obj); |
643 | } |
709 | } |
644 | |
710 | |
645 | void erase (T *obj) |
711 | void erase (T *obj) |
646 | { |
712 | { |
647 | unsigned int pos = obj->*indexmember; |
713 | object_vector_index pos = obj->*indexmember; |
648 | obj->*indexmember = 0; |
714 | obj->*indexmember = 0; |
649 | |
715 | |
650 | if (pos < this->size ()) |
716 | if (pos < this->size ()) |
651 | { |
717 | { |
652 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
718 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
… | |
… | |
660 | { |
726 | { |
661 | erase (&obj); |
727 | erase (&obj); |
662 | } |
728 | } |
663 | }; |
729 | }; |
664 | |
730 | |
|
|
731 | ///////////////////////////////////////////////////////////////////////////// |
|
|
732 | |
|
|
733 | // something like a vector or stack, but without |
|
|
734 | // out of bounds checking |
|
|
735 | template<typename T> |
|
|
736 | struct fixed_stack |
|
|
737 | { |
|
|
738 | T *data; |
|
|
739 | int size; |
|
|
740 | int max; |
|
|
741 | |
|
|
742 | fixed_stack () |
|
|
743 | : size (0), data (0) |
|
|
744 | { |
|
|
745 | } |
|
|
746 | |
|
|
747 | fixed_stack (int max) |
|
|
748 | : size (0), max (max) |
|
|
749 | { |
|
|
750 | data = salloc<T> (max); |
|
|
751 | } |
|
|
752 | |
|
|
753 | void reset (int new_max) |
|
|
754 | { |
|
|
755 | sfree (data, max); |
|
|
756 | size = 0; |
|
|
757 | max = new_max; |
|
|
758 | data = salloc<T> (max); |
|
|
759 | } |
|
|
760 | |
|
|
761 | void free () |
|
|
762 | { |
|
|
763 | sfree (data, max); |
|
|
764 | data = 0; |
|
|
765 | } |
|
|
766 | |
|
|
767 | ~fixed_stack () |
|
|
768 | { |
|
|
769 | sfree (data, max); |
|
|
770 | } |
|
|
771 | |
|
|
772 | T &operator[](int idx) |
|
|
773 | { |
|
|
774 | return data [idx]; |
|
|
775 | } |
|
|
776 | |
|
|
777 | void push (T v) |
|
|
778 | { |
|
|
779 | data [size++] = v; |
|
|
780 | } |
|
|
781 | |
|
|
782 | T &pop () |
|
|
783 | { |
|
|
784 | return data [--size]; |
|
|
785 | } |
|
|
786 | |
|
|
787 | T remove (int idx) |
|
|
788 | { |
|
|
789 | T v = data [idx]; |
|
|
790 | |
|
|
791 | data [idx] = data [--size]; |
|
|
792 | |
|
|
793 | return v; |
|
|
794 | } |
|
|
795 | }; |
|
|
796 | |
|
|
797 | ///////////////////////////////////////////////////////////////////////////// |
|
|
798 | |
665 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
799 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
800 | // returns the number of bytes actually used (including \0) |
666 | void assign (char *dst, const char *src, int maxlen); |
801 | int assign (char *dst, const char *src, int maxsize); |
667 | |
802 | |
668 | // type-safe version of assign |
803 | // type-safe version of assign |
669 | template<int N> |
804 | template<int N> |
670 | inline void assign (char (&dst)[N], const char *src) |
805 | inline int assign (char (&dst)[N], const char *src) |
671 | { |
806 | { |
672 | assign ((char *)&dst, src, N); |
807 | return assign ((char *)&dst, src, N); |
673 | } |
808 | } |
674 | |
809 | |
675 | typedef double tstamp; |
810 | typedef double tstamp; |
676 | |
811 | |
677 | // return current time as timestamp |
812 | // return current time as timestamp |
678 | tstamp now (); |
813 | tstamp now (); |
679 | |
814 | |
680 | int similar_direction (int a, int b); |
815 | int similar_direction (int a, int b); |
681 | |
816 | |
682 | // like sprintf, but returns a "static" buffer |
817 | // like v?sprintf, but returns a "static" buffer |
683 | const char *format (const char *format, ...); |
818 | char *vformat (const char *format, va_list ap); |
|
|
819 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
|
|
820 | |
|
|
821 | // safety-check player input which will become object->msg |
|
|
822 | bool msg_is_safe (const char *msg); |
684 | |
823 | |
685 | ///////////////////////////////////////////////////////////////////////////// |
824 | ///////////////////////////////////////////////////////////////////////////// |
686 | // threads, very very thin wrappers around pthreads |
825 | // threads, very very thin wrappers around pthreads |
687 | |
826 | |
688 | struct thread |
827 | struct thread |