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 | * |
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4 | * Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
6 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * the terms of the Affero GNU General Public License as published by the |
8 | * the terms of the Affero GNU General Public License as published by the |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * option) any later version. |
10 | * option) any later version. |
10 | * |
11 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * GNU General Public License for more details. |
15 | * |
16 | * |
16 | * You should have received a copy of the Affero GNU General Public License |
17 | * You should have received a copy of the Affero GNU General Public License |
17 | * and the GNU General Public License along with this program. If not, see |
18 | * and the GNU General Public License along with this program. If not, see |
18 | * <http://www.gnu.org/licenses/>. |
19 | * <http://www.gnu.org/licenses/>. |
19 | * |
20 | * |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
21 | * The authors can be reached via e-mail to <support@deliantra.net> |
21 | */ |
22 | */ |
22 | |
23 | |
23 | #ifndef UTIL_H__ |
24 | #ifndef UTIL_H__ |
24 | #define UTIL_H__ |
25 | #define UTIL_H__ |
… | |
… | |
35 | #include <cmath> |
36 | #include <cmath> |
36 | #include <new> |
37 | #include <new> |
37 | #include <vector> |
38 | #include <vector> |
38 | |
39 | |
39 | #include <glib.h> |
40 | #include <glib.h> |
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41 | |
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42 | #include <flat_hash_map.hpp> |
40 | |
43 | |
41 | #include <shstr.h> |
44 | #include <shstr.h> |
42 | #include <traits.h> |
45 | #include <traits.h> |
43 | |
46 | |
44 | #if DEBUG_SALLOC |
47 | #if DEBUG_SALLOC |
… | |
… | |
52 | # define g_slice_alloc0(s) calloc (1, (s)) |
55 | # define g_slice_alloc0(s) calloc (1, (s)) |
53 | # define g_slice_alloc(s) malloc ((s)) |
56 | # define g_slice_alloc(s) malloc ((s)) |
54 | # define g_slice_free1(s,p) free ((p)) |
57 | # define g_slice_free1(s,p) free ((p)) |
55 | #endif |
58 | #endif |
56 | |
59 | |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
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58 | #define auto(var,expr) decltype(expr) var = (expr) |
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59 | |
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60 | // could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is |
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61 | // much more obfuscated... :) |
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62 | |
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63 | template<typename T, int N> |
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64 | inline int array_length (const T (&arr)[N]) |
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65 | { |
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66 | return N; |
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67 | } |
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68 | |
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69 | // very ugly macro that basically declares and initialises a variable |
60 | // very ugly macro that basically declares and initialises a variable |
70 | // that is in scope for the next statement only |
61 | // that is in scope for the next statement only |
71 | // works only for stuff that can be assigned 0 and converts to false |
62 | // works only for stuff that can be assigned 0 and converts to false |
72 | // (note: works great for pointers) |
63 | // (note: works great for pointers) |
73 | // most ugly macro I ever wrote |
64 | // most ugly macro I ever wrote |
… | |
… | |
79 | |
70 | |
80 | // in range excluding end |
71 | // in range excluding end |
81 | #define IN_RANGE_EXC(val,beg,end) \ |
72 | #define IN_RANGE_EXC(val,beg,end) \ |
82 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
73 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
83 | |
74 | |
84 | void cleanup (const char *cause, bool make_core = false); |
75 | ecb_cold void cleanup (const char *cause, bool make_core = false); |
85 | void fork_abort (const char *msg); |
76 | ecb_cold void fork_abort (const char *msg); |
86 | |
77 | |
87 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
78 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
88 | // as a is often a constant while b is the variable. it is still a bug, though. |
79 | // as a is often a constant while b is the variable. it is still a bug, though. |
89 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
80 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
90 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
81 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
91 | 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; } |
82 | 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; } |
92 | |
83 | |
93 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
84 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
94 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
85 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
95 | 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); } |
86 | 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); } |
… | |
… | |
112 | |
103 | |
113 | // sign0 returns -1, 0 or +1 |
104 | // sign0 returns -1, 0 or +1 |
114 | template<typename T> |
105 | template<typename T> |
115 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
106 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
116 | |
107 | |
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108 | //clashes with C++0x |
117 | template<typename T, typename U> |
109 | template<typename T, typename U> |
118 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
110 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
119 | |
111 | |
120 | // div* only work correctly for div > 0 |
112 | // div* only work correctly for div > 0 |
121 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
113 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
122 | template<typename T> static inline T div (T val, T div) |
114 | template<typename T> static inline T div (T val, T div) |
123 | { |
115 | { |
124 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
116 | return ecb_expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
125 | } |
117 | } |
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118 | |
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119 | template<> inline float div (float val, float div) { return val / div; } |
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120 | template<> inline double div (double val, double div) { return val / div; } |
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121 | |
126 | // div, round-up |
122 | // div, round-up |
127 | template<typename T> static inline T div_ru (T val, T div) |
123 | template<typename T> static inline T div_ru (T val, T div) |
128 | { |
124 | { |
129 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
125 | return ecb_expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
130 | } |
126 | } |
131 | // div, round-down |
127 | // div, round-down |
132 | template<typename T> static inline T div_rd (T val, T div) |
128 | template<typename T> static inline T div_rd (T val, T div) |
133 | { |
129 | { |
134 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
130 | return ecb_expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
135 | } |
131 | } |
136 | |
132 | |
137 | // lerp* only work correctly for min_in < max_in |
133 | // lerp* only work correctly for min_in < max_in |
138 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
134 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
139 | template<typename T> |
135 | template<typename T> |
… | |
… | |
230 | #if 0 |
226 | #if 0 |
231 | // and has a max. error of 6 in the range -100..+100. |
227 | // and has a max. error of 6 in the range -100..+100. |
232 | #else |
228 | #else |
233 | // and has a max. error of 9 in the range -100..+100. |
229 | // and has a max. error of 9 in the range -100..+100. |
234 | #endif |
230 | #endif |
235 | inline int |
231 | inline int |
236 | idistance (int dx, int dy) |
232 | idistance (int dx, int dy) |
237 | { |
233 | { |
238 | unsigned int dx_ = abs (dx); |
234 | unsigned int dx_ = abs (dx); |
239 | unsigned int dy_ = abs (dy); |
235 | unsigned int dy_ = abs (dy); |
240 | |
236 | |
241 | #if 0 |
237 | #if 0 |
242 | return dx_ > dy_ |
238 | return dx_ > dy_ |
… | |
… | |
245 | #else |
241 | #else |
246 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
242 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
247 | #endif |
243 | #endif |
248 | } |
244 | } |
249 | |
245 | |
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246 | // can be substantially faster than floor, if your value range allows for it |
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247 | template<typename T> |
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248 | inline T |
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249 | fastfloor (T x) |
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250 | { |
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251 | return std::floor (x); |
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252 | } |
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253 | |
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254 | inline float |
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255 | fastfloor (float x) |
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256 | { |
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257 | return sint32(x) - (x < 0); |
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258 | } |
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259 | |
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260 | inline double |
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261 | fastfloor (double x) |
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262 | { |
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263 | return sint64(x) - (x < 0); |
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264 | } |
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265 | |
250 | /* |
266 | /* |
251 | * absdir(int): Returns a number between 1 and 8, which represent |
267 | * absdir(int): Returns a number between 1 and 8, which represent |
252 | * the "absolute" direction of a number (it actually takes care of |
268 | * the "absolute" direction of a number (it actually takes care of |
253 | * "overflow" in previous calculations of a direction). |
269 | * "overflow" in previous calculations of a direction). |
254 | */ |
270 | */ |
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… | |
256 | absdir (int d) |
272 | absdir (int d) |
257 | { |
273 | { |
258 | return ((d - 1) & 7) + 1; |
274 | return ((d - 1) & 7) + 1; |
259 | } |
275 | } |
260 | |
276 | |
261 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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262 | #if GCC_VERSION(3,4) |
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263 | static inline int least_significant_bit (uint32_t x) |
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264 | { |
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265 | return __builtin_ctz (x); |
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266 | } |
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267 | #else |
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268 | int least_significant_bit (uint32_t x); |
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269 | #endif |
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270 | |
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271 | #define for_all_bits_sparse_32(mask, idxvar) \ |
277 | #define for_all_bits_sparse_32(mask, idxvar) \ |
272 | for (uint32_t idxvar, mask_ = mask; \ |
278 | for (uint32_t idxvar, mask_ = mask; \ |
273 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
279 | mask_ && ((idxvar = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);) |
274 | |
280 | |
275 | extern ssize_t slice_alloc; // statistics |
281 | extern ssize_t slice_alloc; // statistics |
276 | |
282 | |
277 | void *salloc_ (int n) throw (std::bad_alloc); |
283 | void *salloc_ (int n); |
278 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
284 | void *salloc_ (int n, void *src); |
279 | |
285 | |
280 | // strictly the same as g_slice_alloc, but never returns 0 |
286 | // strictly the same as g_slice_alloc, but never returns 0 |
281 | template<typename T> |
287 | template<typename T> |
282 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
288 | inline T *salloc (int n = 1) { return (T *)salloc_ (n * sizeof (T)); } |
283 | |
289 | |
284 | // also copies src into the new area, like "memdup" |
290 | // also copies src into the new area, like "memdup" |
285 | // if src is 0, clears the memory |
291 | // if src is 0, clears the memory |
286 | template<typename T> |
292 | template<typename T> |
287 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
293 | inline T *salloc (int n, T *src) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
288 | |
294 | |
289 | // clears the memory |
295 | // clears the memory |
290 | template<typename T> |
296 | template<typename T> |
291 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
297 | inline T *salloc0(int n = 1) { return (T *)salloc_ (n * sizeof (T), 0); } |
292 | |
298 | |
293 | // for symmetry |
299 | // for symmetry |
294 | template<typename T> |
300 | template<typename T> |
295 | inline void sfree (T *ptr, int n = 1) throw () |
301 | inline void sfree (T *ptr, int n = 1) noexcept |
296 | { |
302 | { |
297 | if (expect_true (ptr)) |
303 | if (ecb_expect_true (ptr)) |
298 | { |
304 | { |
299 | slice_alloc -= n * sizeof (T); |
305 | slice_alloc -= n * sizeof (T); |
300 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
306 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
301 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
307 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
302 | assert (slice_alloc >= 0);//D |
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303 | } |
308 | } |
304 | } |
309 | } |
305 | |
310 | |
306 | // nulls the pointer |
311 | // nulls the pointer |
307 | template<typename T> |
312 | template<typename T> |
308 | inline void sfree0 (T *&ptr, int n = 1) throw () |
313 | inline void sfree0 (T *&ptr, int n = 1) noexcept |
309 | { |
314 | { |
310 | sfree<T> (ptr, n); |
315 | sfree<T> (ptr, n); |
311 | ptr = 0; |
316 | ptr = 0; |
312 | } |
317 | } |
313 | |
318 | |
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… | |
381 | typedef const Tp *const_pointer; |
386 | typedef const Tp *const_pointer; |
382 | typedef Tp &reference; |
387 | typedef Tp &reference; |
383 | typedef const Tp &const_reference; |
388 | typedef const Tp &const_reference; |
384 | typedef Tp value_type; |
389 | typedef Tp value_type; |
385 | |
390 | |
386 | template <class U> |
391 | template <class U> |
387 | struct rebind |
392 | struct rebind |
388 | { |
393 | { |
389 | typedef slice_allocator<U> other; |
394 | typedef slice_allocator<U> other; |
390 | }; |
395 | }; |
391 | |
396 | |
392 | slice_allocator () throw () { } |
397 | slice_allocator () noexcept { } |
393 | slice_allocator (const slice_allocator &) throw () { } |
398 | slice_allocator (const slice_allocator &) noexcept { } |
394 | template<typename Tp2> |
399 | template<typename Tp2> |
395 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
400 | slice_allocator (const slice_allocator<Tp2> &) noexcept { } |
396 | |
401 | |
397 | ~slice_allocator () { } |
402 | ~slice_allocator () { } |
398 | |
403 | |
399 | pointer address (reference x) const { return &x; } |
404 | pointer address (reference x) const { return &x; } |
400 | const_pointer address (const_reference x) const { return &x; } |
405 | const_pointer address (const_reference x) const { return &x; } |
… | |
… | |
407 | void deallocate (pointer p, size_type n) |
412 | void deallocate (pointer p, size_type n) |
408 | { |
413 | { |
409 | sfree<Tp> (p, n); |
414 | sfree<Tp> (p, n); |
410 | } |
415 | } |
411 | |
416 | |
412 | size_type max_size () const throw () |
417 | size_type max_size () const noexcept |
413 | { |
418 | { |
414 | return size_t (-1) / sizeof (Tp); |
419 | return size_t (-1) / sizeof (Tp); |
415 | } |
420 | } |
416 | |
421 | |
417 | void construct (pointer p, const Tp &val) |
422 | void construct (pointer p, const Tp &val) |
… | |
… | |
423 | { |
428 | { |
424 | p->~Tp (); |
429 | p->~Tp (); |
425 | } |
430 | } |
426 | }; |
431 | }; |
427 | |
432 | |
428 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
433 | // basically a memory area, but refcounted |
429 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
434 | struct refcnt_buf |
430 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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431 | struct tausworthe_random_generator |
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432 | { |
435 | { |
433 | uint32_t state [4]; |
436 | char *data; |
434 | |
437 | |
435 | void operator =(const tausworthe_random_generator &src) |
438 | refcnt_buf (size_t size = 0); |
436 | { |
439 | refcnt_buf (void *data, size_t size); |
437 | state [0] = src.state [0]; |
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438 | state [1] = src.state [1]; |
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439 | state [2] = src.state [2]; |
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440 | state [3] = src.state [3]; |
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441 | } |
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442 | |
440 | |
443 | void seed (uint32_t seed); |
441 | refcnt_buf (const refcnt_buf &src) |
444 | uint32_t next (); |
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445 | }; |
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446 | |
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447 | // Xorshift RNGs, George Marsaglia |
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448 | // http://www.jstatsoft.org/v08/i14/paper |
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449 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
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450 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
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451 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
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452 | struct xorshift_random_generator |
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453 | { |
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454 | uint32_t x, y; |
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455 | |
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456 | void operator =(const xorshift_random_generator &src) |
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457 | { |
442 | { |
458 | x = src.x; |
443 | data = src.data; |
459 | y = src.y; |
444 | inc (); |
460 | } |
445 | } |
461 | |
446 | |
462 | void seed (uint32_t seed) |
447 | ~refcnt_buf (); |
463 | { |
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464 | x = seed; |
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465 | y = seed * 69069U; |
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466 | } |
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467 | |
448 | |
468 | uint32_t next () |
449 | refcnt_buf &operator =(const refcnt_buf &src); |
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450 | |
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451 | operator char *() |
469 | { |
452 | { |
470 | uint32_t t = x ^ (x << 10); |
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471 | x = y; |
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472 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
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473 | return y; |
453 | return data; |
474 | } |
454 | } |
475 | }; |
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476 | |
455 | |
477 | template<class generator> |
456 | size_t size () const |
478 | struct random_number_generator : generator |
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479 | { |
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480 | // uniform distribution, 0 .. max (0, num - 1) |
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481 | uint32_t operator ()(uint32_t num) |
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482 | { |
457 | { |
483 | return !is_constant (num) ? get_range (num) // non-constant |
458 | return _size (); |
484 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
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485 | : this->next () & (num - 1); // constant, power-of-two |
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486 | } |
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487 | |
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488 | // return a number within the closed interval [min .. max] |
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489 | int operator () (int r_min, int r_max) |
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490 | { |
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491 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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492 | ? r_min + operator ()(r_max - r_min + 1) |
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493 | : get_range (r_min, r_max); |
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494 | } |
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495 | |
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496 | // return a number within the closed interval [0..1] |
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497 | double operator ()() |
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498 | { |
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499 | return this->next () / (double)0xFFFFFFFFU; |
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500 | } |
459 | } |
501 | |
460 | |
502 | protected: |
461 | protected: |
503 | uint32_t get_range (uint32_t r_max); |
462 | enum { |
504 | int get_range (int r_min, int r_max); |
463 | overhead = sizeof (uint32_t) * 2 |
505 | }; |
464 | }; |
506 | |
465 | |
507 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
466 | uint32_t &_size () const |
|
|
467 | { |
|
|
468 | return ((unsigned int *)data)[-2]; |
|
|
469 | } |
508 | |
470 | |
509 | extern rand_gen rndm, rmg_rndm; |
471 | uint32_t &_refcnt () const |
|
|
472 | { |
|
|
473 | return ((unsigned int *)data)[-1]; |
|
|
474 | } |
|
|
475 | |
|
|
476 | void _alloc (uint32_t size) |
|
|
477 | { |
|
|
478 | data = ((char *)salloc<char> (size + overhead)) + overhead; |
|
|
479 | _size () = size; |
|
|
480 | _refcnt () = 1; |
|
|
481 | } |
|
|
482 | |
|
|
483 | void _dealloc (); |
|
|
484 | |
|
|
485 | void inc () |
|
|
486 | { |
|
|
487 | ++_refcnt (); |
|
|
488 | } |
|
|
489 | |
|
|
490 | void dec () |
|
|
491 | { |
|
|
492 | if (!--_refcnt ()) |
|
|
493 | _dealloc (); |
|
|
494 | } |
|
|
495 | }; |
510 | |
496 | |
511 | INTERFACE_CLASS (attachable) |
497 | INTERFACE_CLASS (attachable) |
512 | struct refcnt_base |
498 | struct refcnt_base |
513 | { |
499 | { |
514 | typedef int refcnt_t; |
500 | typedef int refcnt_t; |
… | |
… | |
529 | // p if not null |
515 | // p if not null |
530 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
516 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
531 | |
517 | |
532 | void refcnt_dec () |
518 | void refcnt_dec () |
533 | { |
519 | { |
534 | if (!is_constant (p)) |
520 | if (!ecb_is_constant (p)) |
535 | --*refcnt_ref (); |
521 | --*refcnt_ref (); |
536 | else if (p) |
522 | else if (p) |
537 | --p->refcnt; |
523 | --p->refcnt; |
538 | } |
524 | } |
539 | |
525 | |
540 | void refcnt_inc () |
526 | void refcnt_inc () |
541 | { |
527 | { |
542 | if (!is_constant (p)) |
528 | if (!ecb_is_constant (p)) |
543 | ++*refcnt_ref (); |
529 | ++*refcnt_ref (); |
544 | else if (p) |
530 | else if (p) |
545 | ++p->refcnt; |
531 | ++p->refcnt; |
546 | } |
532 | } |
547 | |
533 | |
… | |
… | |
588 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
574 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
589 | // it is about twice as fast as the one-at-a-time one, |
575 | // it is about twice as fast as the one-at-a-time one, |
590 | // with good distribution. |
576 | // with good distribution. |
591 | // FNV-1a is faster on many cpus because the multiplication |
577 | // FNV-1a is faster on many cpus because the multiplication |
592 | // runs concurrently with the looping logic. |
578 | // runs concurrently with the looping logic. |
|
|
579 | // we modify the hash a bit to improve its distribution |
593 | uint32_t hash = STRHSH_NULL; |
580 | uint32_t hash = STRHSH_NULL; |
594 | |
581 | |
595 | while (*s) |
582 | while (*s) |
596 | hash = (hash ^ *s++) * 16777619U; |
583 | hash = (hash ^ *s++) * 16777619U; |
597 | |
584 | |
598 | return hash; |
585 | return hash ^ (hash >> 16); |
599 | } |
586 | } |
600 | |
587 | |
601 | static inline uint32_t |
588 | static inline uint32_t |
602 | memhsh (const char *s, size_t len) |
589 | memhsh (const char *s, size_t len) |
603 | { |
590 | { |
604 | uint32_t hash = STRHSH_NULL; |
591 | uint32_t hash = STRHSH_NULL; |
605 | |
592 | |
606 | while (len--) |
593 | while (len--) |
607 | hash = (hash ^ *s++) * 16777619U; |
594 | hash = (hash ^ *s++) * 16777619U; |
608 | |
595 | |
609 | return hash; |
596 | return hash; |
610 | } |
597 | } |
… | |
… | |
618 | |
605 | |
619 | std::size_t operator ()(const shstr &s) const |
606 | std::size_t operator ()(const shstr &s) const |
620 | { |
607 | { |
621 | return strhsh (s); |
608 | return strhsh (s); |
622 | } |
609 | } |
|
|
610 | |
|
|
611 | typedef ska::power_of_two_hash_policy hash_policy; |
623 | }; |
612 | }; |
624 | |
613 | |
625 | struct str_equal |
614 | struct str_equal |
626 | { |
615 | { |
627 | bool operator ()(const char *a, const char *b) const |
616 | bool operator ()(const char *a, const char *b) const |
… | |
… | |
653 | } |
642 | } |
654 | }; |
643 | }; |
655 | |
644 | |
656 | // This container blends advantages of linked lists |
645 | // This container blends advantages of linked lists |
657 | // (efficiency) with vectors (random access) by |
646 | // (efficiency) with vectors (random access) by |
658 | // by using an unordered vector and storing the vector |
647 | // using an unordered vector and storing the vector |
659 | // index inside the object. |
648 | // index inside the object. |
660 | // |
649 | // |
661 | // + memory-efficient on most 64 bit archs |
650 | // + memory-efficient on most 64 bit archs |
662 | // + O(1) insert/remove |
651 | // + O(1) insert/remove |
663 | // + free unique (but varying) id for inserted objects |
652 | // + free unique (but varying) id for inserted objects |
… | |
… | |
700 | insert (&obj); |
689 | insert (&obj); |
701 | } |
690 | } |
702 | |
691 | |
703 | void erase (T *obj) |
692 | void erase (T *obj) |
704 | { |
693 | { |
705 | unsigned int pos = obj->*indexmember; |
694 | object_vector_index pos = obj->*indexmember; |
706 | obj->*indexmember = 0; |
695 | obj->*indexmember = 0; |
707 | |
696 | |
708 | if (pos < this->size ()) |
697 | if (pos < this->size ()) |
709 | { |
698 | { |
710 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
699 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
… | |
… | |
718 | { |
707 | { |
719 | erase (&obj); |
708 | erase (&obj); |
720 | } |
709 | } |
721 | }; |
710 | }; |
722 | |
711 | |
|
|
712 | ///////////////////////////////////////////////////////////////////////////// |
|
|
713 | |
|
|
714 | // something like a vector or stack, but without |
|
|
715 | // out of bounds checking |
|
|
716 | template<typename T> |
|
|
717 | struct fixed_stack |
|
|
718 | { |
|
|
719 | T *data; |
|
|
720 | int size; |
|
|
721 | int max; |
|
|
722 | |
|
|
723 | fixed_stack () |
|
|
724 | : size (0), data (0) |
|
|
725 | { |
|
|
726 | } |
|
|
727 | |
|
|
728 | fixed_stack (int max) |
|
|
729 | : size (0), max (max) |
|
|
730 | { |
|
|
731 | data = salloc<T> (max); |
|
|
732 | } |
|
|
733 | |
|
|
734 | void reset (int new_max) |
|
|
735 | { |
|
|
736 | sfree (data, max); |
|
|
737 | size = 0; |
|
|
738 | max = new_max; |
|
|
739 | data = salloc<T> (max); |
|
|
740 | } |
|
|
741 | |
|
|
742 | void free () |
|
|
743 | { |
|
|
744 | sfree (data, max); |
|
|
745 | data = 0; |
|
|
746 | } |
|
|
747 | |
|
|
748 | ~fixed_stack () |
|
|
749 | { |
|
|
750 | sfree (data, max); |
|
|
751 | } |
|
|
752 | |
|
|
753 | T &operator[](int idx) |
|
|
754 | { |
|
|
755 | return data [idx]; |
|
|
756 | } |
|
|
757 | |
|
|
758 | void push (T v) |
|
|
759 | { |
|
|
760 | data [size++] = v; |
|
|
761 | } |
|
|
762 | |
|
|
763 | T &pop () |
|
|
764 | { |
|
|
765 | return data [--size]; |
|
|
766 | } |
|
|
767 | |
|
|
768 | T remove (int idx) |
|
|
769 | { |
|
|
770 | T v = data [idx]; |
|
|
771 | |
|
|
772 | data [idx] = data [--size]; |
|
|
773 | |
|
|
774 | return v; |
|
|
775 | } |
|
|
776 | }; |
|
|
777 | |
|
|
778 | ///////////////////////////////////////////////////////////////////////////// |
|
|
779 | |
723 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
780 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
724 | // returns the number of bytes actually used (including \0) |
781 | // returns the number of bytes actually used (including \0) |
725 | int assign (char *dst, const char *src, int maxsize); |
782 | int assign (char *dst, const char *src, int maxsize); |
726 | |
783 | |
727 | // type-safe version of assign |
784 | // type-safe version of assign |
… | |
… | |
738 | |
795 | |
739 | int similar_direction (int a, int b); |
796 | int similar_direction (int a, int b); |
740 | |
797 | |
741 | // like v?sprintf, but returns a "static" buffer |
798 | // like v?sprintf, but returns a "static" buffer |
742 | char *vformat (const char *format, va_list ap); |
799 | char *vformat (const char *format, va_list ap); |
743 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
800 | char *format (const char *format, ...) ecb_attribute ((format (printf, 1, 2))); |
744 | |
801 | |
745 | // safety-check player input which will become object->msg |
802 | // safety-check player input which will become object->msg |
746 | bool msg_is_safe (const char *msg); |
803 | bool msg_is_safe (const char *msg); |
747 | |
804 | |
748 | ///////////////////////////////////////////////////////////////////////////// |
805 | ///////////////////////////////////////////////////////////////////////////// |