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 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
5 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
6 | * 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 |
7 | * 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 |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * option) any later version. |
9 | * option) any later version. |
… | |
… | |
21 | */ |
21 | */ |
22 | |
22 | |
23 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
24 | #define UTIL_H__ |
24 | #define UTIL_H__ |
25 | |
25 | |
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26 | #include <compiler.h> |
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27 | |
26 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
27 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
28 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
29 | |
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30 | #if __GNUC__ >= 3 |
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31 | # define is_constant(c) __builtin_constant_p (c) |
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32 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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33 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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34 | # define noinline __attribute__((__noinline__)) |
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35 | #else |
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36 | # define is_constant(c) 0 |
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37 | # define expect(expr,value) (expr) |
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38 | # define prefetch(addr,rw,locality) |
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39 | # define noinline |
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40 | #endif |
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41 | |
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42 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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43 | # define decltype(x) typeof(x) |
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44 | #endif |
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45 | |
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46 | // put into ifs if you are very sure that the expression |
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47 | // is mostly true or mosty false. note that these return |
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48 | // booleans, not the expression. |
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49 | #define expect_false(expr) expect ((expr) ? 1 : 0, 0) |
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50 | #define expect_true(expr) expect ((expr) ? 1 : 0, 1) |
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51 | |
31 | |
52 | #include <pthread.h> |
32 | #include <pthread.h> |
53 | |
33 | |
54 | #include <cstddef> |
34 | #include <cstddef> |
55 | #include <cmath> |
35 | #include <cmath> |
… | |
… | |
75 | #endif |
55 | #endif |
76 | |
56 | |
77 | // 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) |
78 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
79 | |
59 | |
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60 | #if cplusplus_does_not_suck |
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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 | |
80 | // very ugly macro that basically declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
81 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
82 | // 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 |
83 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
84 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
… | |
… | |
113 | // sign returns -1 or +1 |
104 | // sign returns -1 or +1 |
114 | template<typename T> |
105 | template<typename T> |
115 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
116 | // relies on 2c representation |
107 | // relies on 2c representation |
117 | template<> |
108 | template<> |
118 | 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); } |
119 | |
114 | |
120 | // sign0 returns -1, 0 or +1 |
115 | // sign0 returns -1, 0 or +1 |
121 | template<typename T> |
116 | template<typename T> |
122 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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118 | |
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119 | template<typename T, typename U> |
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120 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
123 | |
121 | |
124 | // div* only work correctly for div > 0 |
122 | // div* only work correctly for div > 0 |
125 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
126 | template<typename T> static inline T div (T val, T div) |
124 | template<typename T> static inline T div (T val, T div) |
127 | { |
125 | { |
128 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
126 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
129 | } |
127 | } |
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128 | |
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129 | template<> inline float div (float val, float div) { return val / div; } |
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130 | template<> inline double div (double val, double div) { return val / div; } |
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131 | |
130 | // div, round-up |
132 | // div, round-up |
131 | template<typename T> static inline T div_ru (T val, T div) |
133 | template<typename T> static inline T div_ru (T val, T div) |
132 | { |
134 | { |
133 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
135 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
134 | } |
136 | } |
… | |
… | |
206 | int32_t d = b - a; |
208 | int32_t d = b - a; |
207 | d &= d >> 31; |
209 | d &= d >> 31; |
208 | return b - d; |
210 | return b - d; |
209 | } |
211 | } |
210 | |
212 | |
211 | // this is much faster than crossfires original algorithm |
213 | // this is much faster than crossfire's original algorithm |
212 | // on modern cpus |
214 | // on modern cpus |
213 | inline int |
215 | inline int |
214 | isqrt (int n) |
216 | isqrt (int n) |
215 | { |
217 | { |
216 | return (int)sqrtf ((float)n); |
218 | return (int)sqrtf ((float)n); |
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219 | } |
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220 | |
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221 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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222 | // more handy than it looks like, due to the implicit !! done on its arguments |
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223 | inline bool |
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224 | logical_xor (bool a, bool b) |
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225 | { |
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226 | return a != b; |
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227 | } |
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228 | |
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229 | inline bool |
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230 | logical_implies (bool a, bool b) |
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231 | { |
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232 | return a <= b; |
217 | } |
233 | } |
218 | |
234 | |
219 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
235 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
220 | #if 0 |
236 | #if 0 |
221 | // and has a max. error of 6 in the range -100..+100. |
237 | // and has a max. error of 6 in the range -100..+100. |
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246 | absdir (int d) |
262 | absdir (int d) |
247 | { |
263 | { |
248 | return ((d - 1) & 7) + 1; |
264 | return ((d - 1) & 7) + 1; |
249 | } |
265 | } |
250 | |
266 | |
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267 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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268 | #if GCC_VERSION(3,4) |
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269 | static inline int least_significant_bit (uint32_t x) |
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270 | { |
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271 | return __builtin_ctz (x); |
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272 | } |
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273 | #else |
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274 | int least_significant_bit (uint32_t x); |
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275 | #endif |
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276 | |
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277 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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278 | for (uint32_t idxvar, mask_ = mask; \ |
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279 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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280 | |
251 | extern ssize_t slice_alloc; // statistics |
281 | extern ssize_t slice_alloc; // statistics |
252 | |
282 | |
253 | void *salloc_ (int n) throw (std::bad_alloc); |
283 | void *salloc_ (int n) throw (std::bad_alloc); |
254 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
284 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
255 | |
285 | |
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451 | }; |
481 | }; |
452 | |
482 | |
453 | template<class generator> |
483 | template<class generator> |
454 | struct random_number_generator : generator |
484 | struct random_number_generator : generator |
455 | { |
485 | { |
456 | // uniform distribution, 0 .. max (0, num - 1) |
486 | // uniform distribution, [0 .. num - 1] |
457 | uint32_t operator ()(uint32_t num) |
487 | uint32_t operator ()(uint32_t num) |
458 | { |
488 | { |
459 | return !is_constant (num) ? get_range (num) // non-constant |
489 | return !is_constant (num) ? get_range (num) // non-constant |
460 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
490 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
461 | : this->next () & (num - 1); // constant, power-of-two |
491 | : this->next () & (num - 1); // constant, power-of-two |
462 | } |
492 | } |
463 | |
493 | |
464 | // return a number within (min .. max) |
494 | // return a number within the closed interval [min .. max] |
465 | int operator () (int r_min, int r_max) |
495 | int operator () (int r_min, int r_max) |
466 | { |
496 | { |
467 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
497 | return is_constant (r_min <= r_max) && r_min <= r_max |
468 | ? r_min + operator ()(r_max - r_min + 1) |
498 | ? r_min + operator ()(r_max - r_min + 1) |
469 | : get_range (r_min, r_max); |
499 | : get_range (r_min, r_max); |
470 | } |
500 | } |
471 | |
501 | |
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502 | // return a number within the half-open interval [0..1[ |
472 | double operator ()() |
503 | double operator ()() |
473 | { |
504 | { |
474 | return this->next () / (double)0xFFFFFFFFU; |
505 | return this->next () / 0x100000000; |
475 | } |
506 | } |
476 | |
507 | |
477 | protected: |
508 | protected: |
478 | uint32_t get_range (uint32_t r_max); |
509 | uint32_t get_range (uint32_t r_max); |
479 | int get_range (int r_min, int r_max); |
510 | int get_range (int r_min, int r_max); |
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551 | typedef refptr<maptile> maptile_ptr; |
582 | typedef refptr<maptile> maptile_ptr; |
552 | typedef refptr<object> object_ptr; |
583 | typedef refptr<object> object_ptr; |
553 | typedef refptr<archetype> arch_ptr; |
584 | typedef refptr<archetype> arch_ptr; |
554 | typedef refptr<client> client_ptr; |
585 | typedef refptr<client> client_ptr; |
555 | typedef refptr<player> player_ptr; |
586 | typedef refptr<player> player_ptr; |
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587 | typedef refptr<region> region_ptr; |
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588 | |
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589 | #define STRHSH_NULL 2166136261 |
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590 | |
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591 | static inline uint32_t |
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592 | strhsh (const char *s) |
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593 | { |
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594 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
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595 | // it is about twice as fast as the one-at-a-time one, |
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596 | // with good distribution. |
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597 | // FNV-1a is faster on many cpus because the multiplication |
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598 | // runs concurrently with the looping logic. |
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599 | uint32_t hash = STRHSH_NULL; |
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600 | |
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601 | while (*s) |
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602 | hash = (hash ^ *s++) * 16777619U; |
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603 | |
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604 | return hash; |
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605 | } |
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606 | |
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607 | static inline uint32_t |
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608 | memhsh (const char *s, size_t len) |
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609 | { |
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610 | uint32_t hash = STRHSH_NULL; |
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611 | |
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612 | while (len--) |
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613 | hash = (hash ^ *s++) * 16777619U; |
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614 | |
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615 | return hash; |
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616 | } |
556 | |
617 | |
557 | struct str_hash |
618 | struct str_hash |
558 | { |
619 | { |
559 | std::size_t operator ()(const char *s) const |
620 | std::size_t operator ()(const char *s) const |
560 | { |
621 | { |
561 | #if 0 |
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562 | uint32_t hash = 0; |
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563 | |
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564 | /* use the one-at-a-time hash function, which supposedly is |
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565 | * better than the djb2-like one used by perl5.005, but |
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566 | * certainly is better then the bug used here before. |
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567 | * see http://burtleburtle.net/bob/hash/doobs.html |
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568 | */ |
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569 | while (*s) |
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570 | { |
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571 | hash += *s++; |
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572 | hash += hash << 10; |
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573 | hash ^= hash >> 6; |
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574 | } |
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575 | |
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576 | hash += hash << 3; |
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577 | hash ^= hash >> 11; |
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578 | hash += hash << 15; |
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579 | #else |
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580 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
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581 | // it is about twice as fast as the one-at-a-time one, |
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582 | // with good distribution. |
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583 | // FNV-1a is faster on many cpus because the multiplication |
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584 | // runs concurrent with the looping logic. |
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585 | uint32_t hash = 2166136261; |
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586 | |
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587 | while (*s) |
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588 | hash = (hash ^ *s++) * 16777619; |
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589 | #endif |
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590 | |
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591 | return hash; |
622 | return strhsh (s); |
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623 | } |
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624 | |
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625 | std::size_t operator ()(const shstr &s) const |
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626 | { |
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627 | return strhsh (s); |
592 | } |
628 | } |
593 | }; |
629 | }; |
594 | |
630 | |
595 | struct str_equal |
631 | struct str_equal |
596 | { |
632 | { |
… | |
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706 | // return current time as timestamp |
742 | // return current time as timestamp |
707 | tstamp now (); |
743 | tstamp now (); |
708 | |
744 | |
709 | int similar_direction (int a, int b); |
745 | int similar_direction (int a, int b); |
710 | |
746 | |
711 | // like sprintf, but returns a "static" buffer |
747 | // like v?sprintf, but returns a "static" buffer |
712 | const char *format (const char *format, ...); |
748 | char *vformat (const char *format, va_list ap); |
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749 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
713 | |
750 | |
714 | // safety-check player input which will become object->msg |
751 | // safety-check player input which will become object->msg |
715 | bool msg_is_safe (const char *msg); |
752 | bool msg_is_safe (const char *msg); |
716 | |
753 | |
717 | ///////////////////////////////////////////////////////////////////////////// |
754 | ///////////////////////////////////////////////////////////////////////////// |