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 (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011 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. |
… | |
… | |
55 | #endif |
55 | #endif |
56 | |
56 | |
57 | // 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) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
59 | |
59 | |
60 | // could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is |
60 | #if cplusplus_does_not_suck |
61 | // much more obfuscated... :) |
61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
62 | |
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63 | template<typename T, int N> |
62 | template<typename T, int N> |
64 | inline int array_length (const T (&arr)[N]) |
63 | static inline int array_length (const T (&arr)[N]) |
65 | { |
64 | { |
66 | return N; |
65 | return N; |
67 | } |
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 |
68 | |
70 | |
69 | // very ugly macro that basically declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
70 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
71 | // 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 |
72 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
… | |
… | |
84 | void cleanup (const char *cause, bool make_core = false); |
86 | void cleanup (const char *cause, bool make_core = false); |
85 | void fork_abort (const char *msg); |
87 | void fork_abort (const char *msg); |
86 | |
88 | |
87 | // 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, |
88 | // 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. |
89 | 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; } |
90 | 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; } |
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; } |
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; } |
92 | |
94 | |
93 | 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); } |
94 | 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); } |
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); } |
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); } |
… | |
… | |
102 | // sign returns -1 or +1 |
104 | // sign returns -1 or +1 |
103 | template<typename T> |
105 | template<typename T> |
104 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
105 | // relies on 2c representation |
107 | // relies on 2c representation |
106 | template<> |
108 | template<> |
107 | 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); } |
108 | |
114 | |
109 | // sign0 returns -1, 0 or +1 |
115 | // sign0 returns -1, 0 or +1 |
110 | template<typename T> |
116 | template<typename T> |
111 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
112 | |
118 | |
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119 | //clashes with C++0x |
113 | template<typename T, typename U> |
120 | template<typename T, typename U> |
114 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
121 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
115 | |
122 | |
116 | // div* only work correctly for div > 0 |
123 | // div* only work correctly for div > 0 |
117 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
124 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
118 | template<typename T> static inline T div (T val, T div) |
125 | template<typename T> static inline T div (T val, T div) |
119 | { |
126 | { |
120 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
127 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
121 | } |
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 | |
122 | // div, round-up |
133 | // div, round-up |
123 | template<typename T> static inline T div_ru (T val, T div) |
134 | template<typename T> static inline T div_ru (T val, T div) |
124 | { |
135 | { |
125 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
136 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
126 | } |
137 | } |
… | |
… | |
241 | #else |
252 | #else |
242 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
253 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
243 | #endif |
254 | #endif |
244 | } |
255 | } |
245 | |
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 | |
246 | /* |
277 | /* |
247 | * absdir(int): Returns a number between 1 and 8, which represent |
278 | * absdir(int): Returns a number between 1 and 8, which represent |
248 | * the "absolute" direction of a number (it actually takes care of |
279 | * the "absolute" direction of a number (it actually takes care of |
249 | * "overflow" in previous calculations of a direction). |
280 | * "overflow" in previous calculations of a direction). |
250 | */ |
281 | */ |
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293 | if (expect_true (ptr)) |
324 | if (expect_true (ptr)) |
294 | { |
325 | { |
295 | slice_alloc -= n * sizeof (T); |
326 | slice_alloc -= n * sizeof (T); |
296 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
327 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
297 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
328 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
298 | assert (slice_alloc >= 0);//D |
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299 | } |
329 | } |
300 | } |
330 | } |
301 | |
331 | |
302 | // nulls the pointer |
332 | // nulls the pointer |
303 | template<typename T> |
333 | template<typename T> |
… | |
… | |
419 | { |
449 | { |
420 | p->~Tp (); |
450 | p->~Tp (); |
421 | } |
451 | } |
422 | }; |
452 | }; |
423 | |
453 | |
424 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
454 | // basically a memory area, but refcounted |
425 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
455 | struct refcnt_buf |
426 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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427 | struct tausworthe_random_generator |
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428 | { |
456 | { |
429 | uint32_t state [4]; |
457 | char *data; |
430 | |
458 | |
431 | void operator =(const tausworthe_random_generator &src) |
459 | refcnt_buf (size_t size = 0); |
432 | { |
460 | refcnt_buf (void *data, size_t size); |
433 | state [0] = src.state [0]; |
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434 | state [1] = src.state [1]; |
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435 | state [2] = src.state [2]; |
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436 | state [3] = src.state [3]; |
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437 | } |
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438 | |
461 | |
439 | void seed (uint32_t seed); |
462 | refcnt_buf (const refcnt_buf &src) |
440 | uint32_t next (); |
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441 | }; |
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442 | |
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443 | // Xorshift RNGs, George Marsaglia |
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444 | // http://www.jstatsoft.org/v08/i14/paper |
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445 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
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446 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
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447 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
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448 | struct xorshift_random_generator |
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449 | { |
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450 | uint32_t x, y; |
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451 | |
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452 | void operator =(const xorshift_random_generator &src) |
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453 | { |
463 | { |
454 | x = src.x; |
464 | data = src.data; |
455 | y = src.y; |
465 | ++_refcnt (); |
456 | } |
466 | } |
457 | |
467 | |
458 | void seed (uint32_t seed) |
468 | ~refcnt_buf (); |
459 | { |
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460 | x = seed; |
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461 | y = seed * 69069U; |
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462 | } |
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463 | |
469 | |
464 | uint32_t next () |
470 | refcnt_buf &operator =(const refcnt_buf &src); |
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471 | |
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472 | operator char *() |
465 | { |
473 | { |
466 | uint32_t t = x ^ (x << 10); |
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467 | x = y; |
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468 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
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469 | return y; |
474 | return data; |
470 | } |
475 | } |
471 | }; |
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472 | |
476 | |
473 | template<class generator> |
477 | size_t size () const |
474 | struct random_number_generator : generator |
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475 | { |
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476 | // uniform distribution, 0 .. max (0, num - 1) |
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477 | uint32_t operator ()(uint32_t num) |
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478 | { |
478 | { |
479 | return !is_constant (num) ? get_range (num) // non-constant |
479 | return _size (); |
480 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
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481 | : this->next () & (num - 1); // constant, power-of-two |
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482 | } |
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483 | |
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484 | // return a number within the closed interval [min .. max] |
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485 | int operator () (int r_min, int r_max) |
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486 | { |
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487 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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488 | ? r_min + operator ()(r_max - r_min + 1) |
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489 | : get_range (r_min, r_max); |
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490 | } |
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491 | |
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492 | // return a number within the closed interval [0..1] |
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493 | double operator ()() |
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494 | { |
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495 | return this->next () / (double)0xFFFFFFFFU; |
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496 | } |
480 | } |
497 | |
481 | |
498 | protected: |
482 | protected: |
499 | uint32_t get_range (uint32_t r_max); |
483 | enum { |
500 | int get_range (int r_min, int r_max); |
484 | overhead = sizeof (unsigned int) * 2 |
501 | }; |
485 | }; |
502 | |
486 | |
503 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
487 | unsigned int &_size () const |
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488 | { |
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489 | return ((unsigned int *)data)[-2]; |
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490 | } |
504 | |
491 | |
505 | extern rand_gen rndm, rmg_rndm; |
492 | unsigned int &_refcnt () const |
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493 | { |
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494 | return ((unsigned int *)data)[-1]; |
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495 | } |
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496 | |
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497 | void _alloc (unsigned int size) |
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498 | { |
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499 | data = ((char *)salloc<char> (size + overhead)) + overhead; |
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500 | _size () = size; |
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501 | _refcnt () = 1; |
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502 | } |
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503 | |
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504 | void dec () |
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505 | { |
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506 | if (!--_refcnt ()) |
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507 | sfree<char> (data - overhead, size () + overhead); |
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508 | } |
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509 | }; |
506 | |
510 | |
507 | INTERFACE_CLASS (attachable) |
511 | INTERFACE_CLASS (attachable) |
508 | struct refcnt_base |
512 | struct refcnt_base |
509 | { |
513 | { |
510 | typedef int refcnt_t; |
514 | typedef int refcnt_t; |
… | |
… | |
584 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
588 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
585 | // it is about twice as fast as the one-at-a-time one, |
589 | // it is about twice as fast as the one-at-a-time one, |
586 | // with good distribution. |
590 | // with good distribution. |
587 | // FNV-1a is faster on many cpus because the multiplication |
591 | // FNV-1a is faster on many cpus because the multiplication |
588 | // runs concurrently with the looping logic. |
592 | // runs concurrently with the looping logic. |
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593 | // we modify the hash a bit to improve its distribution |
589 | uint32_t hash = STRHSH_NULL; |
594 | uint32_t hash = STRHSH_NULL; |
590 | |
595 | |
591 | while (*s) |
596 | while (*s) |
592 | hash = (hash ^ *s++) * 16777619U; |
597 | hash = (hash ^ *s++) * 16777619U; |
593 | |
598 | |
594 | return hash; |
599 | return hash ^ (hash >> 16); |
595 | } |
600 | } |
596 | |
601 | |
597 | static inline uint32_t |
602 | static inline uint32_t |
598 | memhsh (const char *s, size_t len) |
603 | memhsh (const char *s, size_t len) |
599 | { |
604 | { |
… | |
… | |
714 | { |
719 | { |
715 | erase (&obj); |
720 | erase (&obj); |
716 | } |
721 | } |
717 | }; |
722 | }; |
718 | |
723 | |
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724 | ///////////////////////////////////////////////////////////////////////////// |
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725 | |
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726 | // something like a vector or stack, but without |
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727 | // out of bounds checking |
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728 | template<typename T> |
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729 | struct fixed_stack |
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730 | { |
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731 | T *data; |
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732 | int size; |
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733 | int max; |
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734 | |
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735 | fixed_stack () |
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736 | : size (0), data (0) |
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737 | { |
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738 | } |
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739 | |
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740 | fixed_stack (int max) |
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741 | : size (0), max (max) |
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742 | { |
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743 | data = salloc<T> (max); |
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744 | } |
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745 | |
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746 | void reset (int new_max) |
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747 | { |
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748 | sfree (data, max); |
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749 | size = 0; |
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750 | max = new_max; |
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751 | data = salloc<T> (max); |
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752 | } |
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753 | |
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754 | void free () |
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755 | { |
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756 | sfree (data, max); |
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757 | data = 0; |
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758 | } |
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759 | |
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760 | ~fixed_stack () |
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761 | { |
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762 | sfree (data, max); |
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763 | } |
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764 | |
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765 | T &operator[](int idx) |
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766 | { |
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767 | return data [idx]; |
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768 | } |
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769 | |
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770 | void push (T v) |
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771 | { |
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772 | data [size++] = v; |
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773 | } |
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774 | |
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775 | T &pop () |
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776 | { |
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777 | return data [--size]; |
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778 | } |
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779 | |
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780 | T remove (int idx) |
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781 | { |
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782 | T v = data [idx]; |
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783 | |
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784 | data [idx] = data [--size]; |
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785 | |
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786 | return v; |
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787 | } |
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788 | }; |
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789 | |
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790 | ///////////////////////////////////////////////////////////////////////////// |
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791 | |
719 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
792 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
720 | // returns the number of bytes actually used (including \0) |
793 | // returns the number of bytes actually used (including \0) |
721 | int assign (char *dst, const char *src, int maxsize); |
794 | int assign (char *dst, const char *src, int maxsize); |
722 | |
795 | |
723 | // type-safe version of assign |
796 | // type-safe version of assign |