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Comparing deliantra/server/include/util.h (file contents):
Revision 1.35 by root, Fri Jan 19 22:47:57 2007 UTC vs.
Revision 1.65 by root, Tue Apr 1 19:50:38 2008 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
6 * Deliantra is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 *
19 * The authors can be reached via e-mail to <support@deliantra.net>
20 */
21
1#ifndef UTIL_H__ 22#ifndef UTIL_H__
2#define UTIL_H__ 23#define UTIL_H__
3 24
25#define DEBUG_SALLOC 0
26#define PREFER_MALLOC 0
27
4#if __GNUC__ >= 3 28#if __GNUC__ >= 3
5# define is_constant(c) __builtin_constant_p (c) 29# define is_constant(c) __builtin_constant_p (c)
30# define expect(expr,value) __builtin_expect ((expr),(value))
31# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
6#else 32#else
7# define is_constant(c) 0 33# define is_constant(c) 0
34# define expect(expr,value) (expr)
35# define prefetch(addr,rw,locality)
8#endif 36#endif
37
38#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
39# define decltype(x) typeof(x)
40#endif
41
42// put into ifs if you are very sure that the expression
43// is mostly true or mosty false. note that these return
44// booleans, not the expression.
45#define expect_false(expr) expect ((expr) != 0, 0)
46#define expect_true(expr) expect ((expr) != 0, 1)
9 47
10#include <cstddef> 48#include <cstddef>
11#include <cmath> 49#include <cmath>
12#include <new> 50#include <new>
13#include <vector> 51#include <vector>
… …
15#include <glib.h> 53#include <glib.h>
16 54
17#include <shstr.h> 55#include <shstr.h>
18#include <traits.h> 56#include <traits.h>
19 57
58#if DEBUG_SALLOC
59# define g_slice_alloc0(s) debug_slice_alloc0(s)
60# define g_slice_alloc(s) debug_slice_alloc(s)
61# define g_slice_free1(s,p) debug_slice_free1(s,p)
62void *g_slice_alloc (unsigned long size);
63void *g_slice_alloc0 (unsigned long size);
64void g_slice_free1 (unsigned long size, void *ptr);
65#endif
66
20// use a gcc extension for auto declarations until ISO C++ sanctifies them 67// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
21#define AUTODECL(var,expr) typeof(expr) var = (expr) 68#define auto(var,expr) decltype(expr) var = (expr)
22 69
23// very ugly macro that basicaly declares and initialises a variable 70// very ugly macro that basicaly declares and initialises a variable
24// that is in scope for the next statement only 71// that is in scope for the next statement only
25// works only for stuff that can be assigned 0 and converts to false 72// works only for stuff that can be assigned 0 and converts to false
26// (note: works great for pointers) 73// (note: works great for pointers)
27// most ugly macro I ever wrote 74// most ugly macro I ever wrote
28#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) 75#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
29 76
30// in range including end 77// in range including end
31#define IN_RANGE_INC(val,beg,end) \ 78#define IN_RANGE_INC(val,beg,end) \
32 ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) 79 ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
33 80
… …
42template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } 89template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
43template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } 90template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
44template<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; } 91template<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; }
45 92
46template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } 93template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
94
95template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
96template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
97
98template<typename T>
99static inline T
100lerp (T val, T min_in, T max_in, T min_out, T max_out)
101{
102 return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;
103}
104
105// lots of stuff taken from FXT
106
107/* Rotate right. This is used in various places for checksumming */
108//TODO: that sucks, use a better checksum algo
109static inline uint32_t
110rotate_right (uint32_t c, uint32_t count = 1)
111{
112 return (c << (32 - count)) | (c >> count);
113}
114
115static inline uint32_t
116rotate_left (uint32_t c, uint32_t count = 1)
117{
118 return (c >> (32 - count)) | (c << count);
119}
120
121// Return abs(a-b)
122// Both a and b must not have the most significant bit set
123static inline uint32_t
124upos_abs_diff (uint32_t a, uint32_t b)
125{
126 long d1 = b - a;
127 long d2 = (d1 & (d1 >> 31)) << 1;
128
129 return d1 - d2; // == (b - d) - (a + d);
130}
131
132// Both a and b must not have the most significant bit set
133static inline uint32_t
134upos_min (uint32_t a, uint32_t b)
135{
136 int32_t d = b - a;
137 d &= d >> 31;
138 return a + d;
139}
140
141// Both a and b must not have the most significant bit set
142static inline uint32_t
143upos_max (uint32_t a, uint32_t b)
144{
145 int32_t d = b - a;
146 d &= d >> 31;
147 return b - d;
148}
47 149
48// this is much faster than crossfires original algorithm 150// this is much faster than crossfires original algorithm
49// on modern cpus 151// on modern cpus
50inline int 152inline int
51isqrt (int n) 153isqrt (int n)
… …
83absdir (int d) 185absdir (int d)
84{ 186{
85 return ((d - 1) & 7) + 1; 187 return ((d - 1) & 7) + 1;
86} 188}
87 189
190extern size_t slice_alloc; // statistics
191
88// makes dynamically allocated objects zero-initialised 192// makes dynamically allocated objects zero-initialised
89struct zero_initialised 193struct zero_initialised
90{ 194{
91 void *operator new (size_t s, void *p) 195 void *operator new (size_t s, void *p)
92 { 196 {
… …
94 return p; 198 return p;
95 } 199 }
96 200
97 void *operator new (size_t s) 201 void *operator new (size_t s)
98 { 202 {
203 slice_alloc += s;
99 return g_slice_alloc0 (s); 204 return g_slice_alloc0 (s);
100 } 205 }
101 206
102 void *operator new[] (size_t s) 207 void *operator new[] (size_t s)
103 { 208 {
209 slice_alloc += s;
104 return g_slice_alloc0 (s); 210 return g_slice_alloc0 (s);
105 } 211 }
106 212
107 void operator delete (void *p, size_t s) 213 void operator delete (void *p, size_t s)
108 { 214 {
215 slice_alloc -= s;
109 g_slice_free1 (s, p); 216 g_slice_free1 (s, p);
110 } 217 }
111 218
112 void operator delete[] (void *p, size_t s) 219 void operator delete[] (void *p, size_t s)
113 { 220 {
221 slice_alloc -= s;
114 g_slice_free1 (s, p); 222 g_slice_free1 (s, p);
115 } 223 }
116}; 224};
117 225
118void *salloc_ (int n) throw (std::bad_alloc); 226void *salloc_ (int n) throw (std::bad_alloc);
… …
133 241
134// for symmetry 242// for symmetry
135template<typename T> 243template<typename T>
136inline void sfree (T *ptr, int n = 1) throw () 244inline void sfree (T *ptr, int n = 1) throw ()
137{ 245{
246#if PREFER_MALLOC
247 free (ptr);
248#else
249 slice_alloc -= n * sizeof (T);
138 g_slice_free1 (n * sizeof (T), (void *)ptr); 250 g_slice_free1 (n * sizeof (T), (void *)ptr);
251#endif
139} 252}
140 253
141// a STL-compatible allocator that uses g_slice 254// a STL-compatible allocator that uses g_slice
142// boy, this is verbose 255// boy, this is verbose
143template<typename Tp> 256template<typename Tp>
… …
156 { 269 {
157 typedef slice_allocator<U> other; 270 typedef slice_allocator<U> other;
158 }; 271 };
159 272
160 slice_allocator () throw () { } 273 slice_allocator () throw () { }
161 slice_allocator (const slice_allocator &o) throw () { } 274 slice_allocator (const slice_allocator &) throw () { }
162 template<typename Tp2> 275 template<typename Tp2>
163 slice_allocator (const slice_allocator<Tp2> &) throw () { } 276 slice_allocator (const slice_allocator<Tp2> &) throw () { }
164 277
165 ~slice_allocator () { } 278 ~slice_allocator () { }
166 279
… …
175 void deallocate (pointer p, size_type n) 288 void deallocate (pointer p, size_type n)
176 { 289 {
177 sfree<Tp> (p, n); 290 sfree<Tp> (p, n);
178 } 291 }
179 292
180 size_type max_size ()const throw () 293 size_type max_size () const throw ()
181 { 294 {
182 return size_t (-1) / sizeof (Tp); 295 return size_t (-1) / sizeof (Tp);
183 } 296 }
184 297
185 void construct (pointer p, const Tp &val) 298 void construct (pointer p, const Tp &val)
… …
211 324
212 void seed (uint32_t seed); 325 void seed (uint32_t seed);
213 uint32_t next (); 326 uint32_t next ();
214 327
215 // uniform distribution 328 // uniform distribution
216 uint32_t operator ()(uint32_t r_max) 329 uint32_t operator ()(uint32_t num)
217 { 330 {
218 return is_constant (r_max) 331 return is_constant (num)
219 ? this->next () % r_max 332 ? (next () * (uint64_t)num) >> 32U
220 : get_range (r_max); 333 : get_range (num);
221 } 334 }
222 335
223 // return a number within (min .. max) 336 // return a number within (min .. max)
224 int operator () (int r_min, int r_max) 337 int operator () (int r_min, int r_max)
225 { 338 {
226 return is_constant (r_min) && is_constant (r_max) 339 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
227 ? r_min + (*this) (max (r_max - r_min + 1, 1)) 340 ? r_min + operator ()(r_max - r_min + 1)
228 : get_range (r_min, r_max); 341 : get_range (r_min, r_max);
229 } 342 }
230 343
231 double operator ()() 344 double operator ()()
232 { 345 {
… …
240 353
241typedef tausworthe_random_generator rand_gen; 354typedef tausworthe_random_generator rand_gen;
242 355
243extern rand_gen rndm; 356extern rand_gen rndm;
244 357
358INTERFACE_CLASS (attachable)
359struct refcnt_base
360{
361 typedef int refcnt_t;
362 mutable refcnt_t ACC (RW, refcnt);
363
364 MTH void refcnt_inc () const { ++refcnt; }
365 MTH void refcnt_dec () const { --refcnt; }
366
367 refcnt_base () : refcnt (0) { }
368};
369
370// to avoid branches with more advanced compilers
371extern refcnt_base::refcnt_t refcnt_dummy;
372
245template<class T> 373template<class T>
246struct refptr 374struct refptr
247{ 375{
376 // p if not null
377 refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
378
379 void refcnt_dec ()
380 {
381 if (!is_constant (p))
382 --*refcnt_ref ();
383 else if (p)
384 --p->refcnt;
385 }
386
387 void refcnt_inc ()
388 {
389 if (!is_constant (p))
390 ++*refcnt_ref ();
391 else if (p)
392 ++p->refcnt;
393 }
394
248 T *p; 395 T *p;
249 396
250 refptr () : p(0) { } 397 refptr () : p(0) { }
251 refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } 398 refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
252 refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } 399 refptr (T *p) : p(p) { refcnt_inc (); }
253 ~refptr () { if (p) p->refcnt_dec (); } 400 ~refptr () { refcnt_dec (); }
254 401
255 const refptr<T> &operator =(T *o) 402 const refptr<T> &operator =(T *o)
256 { 403 {
404 // if decrementing ever destroys we need to reverse the order here
257 if (p) p->refcnt_dec (); 405 refcnt_dec ();
258 p = o; 406 p = o;
259 if (p) p->refcnt_inc (); 407 refcnt_inc ();
260
261 return *this; 408 return *this;
262 } 409 }
263 410
264 const refptr<T> &operator =(const refptr<T> o) 411 const refptr<T> &operator =(const refptr<T> &o)
265 { 412 {
266 *this = o.p; 413 *this = o.p;
267 return *this; 414 return *this;
268 } 415 }
269 416
270 T &operator * () const { return *p; } 417 T &operator * () const { return *p; }
271 T *operator ->() const { return p; } 418 T *operator ->() const { return p; }
272 419
273 operator T *() const { return p; } 420 operator T *() const { return p; }
274}; 421};
275 422
276typedef refptr<maptile> maptile_ptr; 423typedef refptr<maptile> maptile_ptr;
… …
311 { 458 {
312 return !strcmp (a, b); 459 return !strcmp (a, b);
313 } 460 }
314}; 461};
315 462
463// Mostly the same as std::vector, but insert/erase can reorder
464// the elements, making append(=insert)/remove O(1) instead of O(n).
465//
466// NOTE: only some forms of erase are available
316template<class T> 467template<class T>
317struct unordered_vector : std::vector<T, slice_allocator<T> > 468struct unordered_vector : std::vector<T, slice_allocator<T> >
318{ 469{
319 typedef typename unordered_vector::iterator iterator; 470 typedef typename unordered_vector::iterator iterator;
320 471
… …
330 { 481 {
331 erase ((unsigned int )(i - this->begin ())); 482 erase ((unsigned int )(i - this->begin ()));
332 } 483 }
333}; 484};
334 485
335template<class T, int T::* index> 486// This container blends advantages of linked lists
487// (efficiency) with vectors (random access) by
488// by using an unordered vector and storing the vector
489// index inside the object.
490//
491// + memory-efficient on most 64 bit archs
492// + O(1) insert/remove
493// + free unique (but varying) id for inserted objects
494// + cache-friendly iteration
495// - only works for pointers to structs
496//
497// NOTE: only some forms of erase/insert are available
498typedef int object_vector_index;
499
500template<class T, object_vector_index T::*indexmember>
336struct object_vector : std::vector<T *, slice_allocator<T *> > 501struct object_vector : std::vector<T *, slice_allocator<T *> >
337{ 502{
503 typedef typename object_vector::iterator iterator;
504
505 bool contains (const T *obj) const
506 {
507 return obj->*indexmember;
508 }
509
510 iterator find (const T *obj)
511 {
512 return obj->*indexmember
513 ? this->begin () + obj->*indexmember - 1
514 : this->end ();
515 }
516
517 void push_back (T *obj)
518 {
519 std::vector<T *, slice_allocator<T *> >::push_back (obj);
520 obj->*indexmember = this->size ();
521 }
522
338 void insert (T *obj) 523 void insert (T *obj)
339 { 524 {
340 assert (!(obj->*index));
341 push_back (obj); 525 push_back (obj);
342 obj->*index = this->size ();
343 } 526 }
344 527
345 void insert (T &obj) 528 void insert (T &obj)
346 { 529 {
347 insert (&obj); 530 insert (&obj);
348 } 531 }
349 532
350 void erase (T *obj) 533 void erase (T *obj)
351 { 534 {
352 assert (obj->*index);
353 int pos = obj->*index; 535 unsigned int pos = obj->*indexmember;
354 obj->*index = 0; 536 obj->*indexmember = 0;
355 537
356 if (pos < this->size ()) 538 if (pos < this->size ())
357 { 539 {
358 (*this)[pos - 1] = (*this)[this->size () - 1]; 540 (*this)[pos - 1] = (*this)[this->size () - 1];
359 (*this)[pos - 1]->*index = pos; 541 (*this)[pos - 1]->*indexmember = pos;
360 } 542 }
361 543
362 this->pop_back (); 544 this->pop_back ();
363 } 545 }
364 546
365 void erase (T &obj) 547 void erase (T &obj)
366 { 548 {
367 errase (&obj); 549 erase (&obj);
368 } 550 }
369}; 551};
370 552
371// basically does what strncpy should do, but appends "..." to strings exceeding length 553// basically does what strncpy should do, but appends "..." to strings exceeding length
372void assign (char *dst, const char *src, int maxlen); 554void assign (char *dst, const char *src, int maxlen);
… …
378 assign ((char *)&dst, src, N); 560 assign ((char *)&dst, src, N);
379} 561}
380 562
381typedef double tstamp; 563typedef double tstamp;
382 564
383// return current time as timestampe 565// return current time as timestamp
384tstamp now (); 566tstamp now ();
385 567
386int similar_direction (int a, int b); 568int similar_direction (int a, int b);
387 569
388#endif 570// like sprintf, but returns a "static" buffer
571const char *format (const char *format, ...);
389 572
573#endif
574

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