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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify it under |
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7 | * the terms of the Affero GNU General Public License as published by the |
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8 | * Free Software Foundation, either version 3 of the License, or (at your |
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9 | * option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the Affero GNU General Public License |
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17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
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19 | * |
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20 | * The authors can be reached via e-mail to <support@deliantra.net> |
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21 | */ |
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22 | |
| 1 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
| 2 | #define UTIL_H__ |
24 | #define UTIL_H__ |
| 3 | |
25 | |
| 4 | //#define PREFER_MALLOC |
26 | #include <compiler.h> |
| 5 | |
27 | |
| 6 | #if __GNUC__ >= 3 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
| 7 | # define is_constant(c) __builtin_constant_p (c) |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
| 8 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
| 9 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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| 10 | #else |
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| 11 | # define is_constant(c) 0 |
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| 12 | # define expect(expr,value) (expr) |
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| 13 | # define prefetch(addr,rw,locality) |
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| 14 | #endif |
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| 15 | |
31 | |
| 16 | // put into ifs if you are very sure that the expression |
32 | #include <pthread.h> |
| 17 | // is mostly true or mosty false. note that these return |
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| 18 | // booleans, not the expression. |
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| 19 | #define expect_false(expr) expect ((expr) != 0, 0) |
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| 20 | #define expect_true(expr) expect ((expr) != 0, 1) |
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| 21 | |
33 | |
| 22 | #include <cstddef> |
34 | #include <cstddef> |
| 23 | #include <cmath> |
35 | #include <cmath> |
| 24 | #include <new> |
36 | #include <new> |
| 25 | #include <vector> |
37 | #include <vector> |
| … | |
… | |
| 27 | #include <glib.h> |
39 | #include <glib.h> |
| 28 | |
40 | |
| 29 | #include <shstr.h> |
41 | #include <shstr.h> |
| 30 | #include <traits.h> |
42 | #include <traits.h> |
| 31 | |
43 | |
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44 | #if DEBUG_SALLOC |
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45 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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46 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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47 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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48 | void *g_slice_alloc (unsigned long size); |
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49 | void *g_slice_alloc0 (unsigned long size); |
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50 | void g_slice_free1 (unsigned long size, void *ptr); |
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51 | #elif PREFER_MALLOC |
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52 | # define g_slice_alloc0(s) calloc (1, (s)) |
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53 | # define g_slice_alloc(s) malloc ((s)) |
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54 | # define g_slice_free1(s,p) free ((p)) |
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55 | #endif |
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56 | |
| 32 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 33 | #define auto(var,expr) typeof(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
| 34 | |
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 | |
| 35 | // very ugly macro that basicaly declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
| 36 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
| 37 | // 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 |
| 38 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
| 39 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
| 40 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
76 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
| 41 | |
77 | |
| 42 | // in range including end |
78 | // in range including end |
| 43 | #define IN_RANGE_INC(val,beg,end) \ |
79 | #define IN_RANGE_INC(val,beg,end) \ |
| 44 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
80 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
| 45 | |
81 | |
| 46 | // in range excluding end |
82 | // in range excluding end |
| 47 | #define IN_RANGE_EXC(val,beg,end) \ |
83 | #define IN_RANGE_EXC(val,beg,end) \ |
| 48 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
84 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
| 49 | |
85 | |
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86 | void cleanup (const char *cause, bool make_core = false); |
| 50 | void fork_abort (const char *msg); |
87 | void fork_abort (const char *msg); |
| 51 | |
88 | |
| 52 | // 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, |
| 53 | // 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. |
| 54 | 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 (U)a < b ? (U)a : b; } |
| 55 | 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 (U)a > b ? (U)a : b; } |
| 56 | 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; } |
| 57 | |
94 | |
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95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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97 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
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98 | |
| 58 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
99 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
| 59 | |
100 | |
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101 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
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102 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
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103 | |
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104 | // sign returns -1 or +1 |
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105 | template<typename T> |
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106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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107 | // relies on 2c representation |
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108 | template<> |
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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); } |
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114 | |
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115 | // sign0 returns -1, 0 or +1 |
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116 | template<typename T> |
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117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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118 | |
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119 | //clashes with C++0x |
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120 | template<typename T, typename U> |
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121 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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122 | |
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123 | // div* only work correctly for div > 0 |
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124 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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125 | template<typename T> static inline T div (T val, T div) |
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126 | { |
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127 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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128 | } |
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129 | |
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130 | template<> inline float div (float val, float div) { return val / div; } |
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131 | template<> inline double div (double val, double div) { return val / div; } |
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132 | |
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133 | // div, round-up |
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134 | template<typename T> static inline T div_ru (T val, T div) |
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135 | { |
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136 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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137 | } |
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138 | // div, round-down |
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139 | template<typename T> static inline T div_rd (T val, T div) |
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140 | { |
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141 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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142 | } |
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143 | |
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144 | // lerp* only work correctly for min_in < max_in |
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145 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
| 60 | template<typename T> |
146 | template<typename T> |
| 61 | static inline T |
147 | static inline T |
| 62 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
148 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
| 63 | { |
149 | { |
| 64 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
150 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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151 | } |
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152 | |
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153 | // lerp, round-down |
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154 | template<typename T> |
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155 | static inline T |
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156 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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157 | { |
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158 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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159 | } |
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160 | |
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161 | // lerp, round-up |
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162 | template<typename T> |
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163 | static inline T |
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164 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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165 | { |
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166 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
| 65 | } |
167 | } |
| 66 | |
168 | |
| 67 | // lots of stuff taken from FXT |
169 | // lots of stuff taken from FXT |
| 68 | |
170 | |
| 69 | /* Rotate right. This is used in various places for checksumming */ |
171 | /* Rotate right. This is used in various places for checksumming */ |
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| 107 | int32_t d = b - a; |
209 | int32_t d = b - a; |
| 108 | d &= d >> 31; |
210 | d &= d >> 31; |
| 109 | return b - d; |
211 | return b - d; |
| 110 | } |
212 | } |
| 111 | |
213 | |
| 112 | // this is much faster than crossfires original algorithm |
214 | // this is much faster than crossfire's original algorithm |
| 113 | // on modern cpus |
215 | // on modern cpus |
| 114 | inline int |
216 | inline int |
| 115 | isqrt (int n) |
217 | isqrt (int n) |
| 116 | { |
218 | { |
| 117 | return (int)sqrtf ((float)n); |
219 | return (int)sqrtf ((float)n); |
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220 | } |
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221 | |
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222 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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223 | // more handy than it looks like, due to the implicit !! done on its arguments |
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224 | inline bool |
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225 | logical_xor (bool a, bool b) |
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226 | { |
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227 | return a != b; |
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228 | } |
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229 | |
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230 | inline bool |
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231 | logical_implies (bool a, bool b) |
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232 | { |
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233 | return a <= b; |
| 118 | } |
234 | } |
| 119 | |
235 | |
| 120 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
236 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
| 121 | #if 0 |
237 | #if 0 |
| 122 | // and has a max. error of 6 in the range -100..+100. |
238 | // and has a max. error of 6 in the range -100..+100. |
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| 136 | #else |
252 | #else |
| 137 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
253 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
| 138 | #endif |
254 | #endif |
| 139 | } |
255 | } |
| 140 | |
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 | |
| 141 | /* |
277 | /* |
| 142 | * absdir(int): Returns a number between 1 and 8, which represent |
278 | * absdir(int): Returns a number between 1 and 8, which represent |
| 143 | * the "absolute" direction of a number (it actually takes care of |
279 | * the "absolute" direction of a number (it actually takes care of |
| 144 | * "overflow" in previous calculations of a direction). |
280 | * "overflow" in previous calculations of a direction). |
| 145 | */ |
281 | */ |
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| 147 | absdir (int d) |
283 | absdir (int d) |
| 148 | { |
284 | { |
| 149 | return ((d - 1) & 7) + 1; |
285 | return ((d - 1) & 7) + 1; |
| 150 | } |
286 | } |
| 151 | |
287 | |
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288 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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289 | #if GCC_VERSION(3,4) |
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290 | static inline int least_significant_bit (uint32_t x) |
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291 | { |
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292 | return __builtin_ctz (x); |
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293 | } |
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294 | #else |
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295 | int least_significant_bit (uint32_t x); |
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296 | #endif |
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297 | |
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298 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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299 | for (uint32_t idxvar, mask_ = mask; \ |
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300 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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301 | |
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302 | extern ssize_t slice_alloc; // statistics |
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303 | |
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304 | void *salloc_ (int n) throw (std::bad_alloc); |
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305 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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306 | |
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307 | // strictly the same as g_slice_alloc, but never returns 0 |
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308 | template<typename T> |
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309 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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310 | |
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311 | // also copies src into the new area, like "memdup" |
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312 | // if src is 0, clears the memory |
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313 | template<typename T> |
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314 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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315 | |
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316 | // clears the memory |
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317 | template<typename T> |
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318 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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319 | |
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320 | // for symmetry |
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321 | template<typename T> |
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322 | inline void sfree (T *ptr, int n = 1) throw () |
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323 | { |
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324 | if (expect_true (ptr)) |
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325 | { |
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326 | slice_alloc -= n * sizeof (T); |
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327 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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328 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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329 | assert (slice_alloc >= 0);//D |
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330 | } |
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331 | } |
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332 | |
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333 | // nulls the pointer |
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334 | template<typename T> |
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335 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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336 | { |
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337 | sfree<T> (ptr, n); |
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338 | ptr = 0; |
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339 | } |
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340 | |
| 152 | // makes dynamically allocated objects zero-initialised |
341 | // makes dynamically allocated objects zero-initialised |
| 153 | struct zero_initialised |
342 | struct zero_initialised |
| 154 | { |
343 | { |
| 155 | void *operator new (size_t s, void *p) |
344 | void *operator new (size_t s, void *p) |
| 156 | { |
345 | { |
| … | |
… | |
| 158 | return p; |
347 | return p; |
| 159 | } |
348 | } |
| 160 | |
349 | |
| 161 | void *operator new (size_t s) |
350 | void *operator new (size_t s) |
| 162 | { |
351 | { |
| 163 | return g_slice_alloc0 (s); |
352 | return salloc0<char> (s); |
| 164 | } |
353 | } |
| 165 | |
354 | |
| 166 | void *operator new[] (size_t s) |
355 | void *operator new[] (size_t s) |
| 167 | { |
356 | { |
| 168 | return g_slice_alloc0 (s); |
357 | return salloc0<char> (s); |
| 169 | } |
358 | } |
| 170 | |
359 | |
| 171 | void operator delete (void *p, size_t s) |
360 | void operator delete (void *p, size_t s) |
| 172 | { |
361 | { |
| 173 | g_slice_free1 (s, p); |
362 | sfree ((char *)p, s); |
| 174 | } |
363 | } |
| 175 | |
364 | |
| 176 | void operator delete[] (void *p, size_t s) |
365 | void operator delete[] (void *p, size_t s) |
| 177 | { |
366 | { |
| 178 | g_slice_free1 (s, p); |
367 | sfree ((char *)p, s); |
| 179 | } |
368 | } |
| 180 | }; |
369 | }; |
| 181 | |
370 | |
| 182 | void *salloc_ (int n) throw (std::bad_alloc); |
371 | // makes dynamically allocated objects zero-initialised |
| 183 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
372 | struct slice_allocated |
| 184 | |
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| 185 | // strictly the same as g_slice_alloc, but never returns 0 |
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| 186 | template<typename T> |
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| 187 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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| 188 | |
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| 189 | // also copies src into the new area, like "memdup" |
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| 190 | // if src is 0, clears the memory |
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| 191 | template<typename T> |
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| 192 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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| 193 | |
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| 194 | // clears the memory |
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| 195 | template<typename T> |
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| 196 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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| 197 | |
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| 198 | // for symmetry |
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| 199 | template<typename T> |
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| 200 | inline void sfree (T *ptr, int n = 1) throw () |
|
|
| 201 | { |
373 | { |
| 202 | #ifdef PREFER_MALLOC |
374 | void *operator new (size_t s, void *p) |
| 203 | free (ptr); |
375 | { |
| 204 | #else |
376 | return p; |
| 205 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
377 | } |
| 206 | #endif |
378 | |
| 207 | } |
379 | void *operator new (size_t s) |
|
|
380 | { |
|
|
381 | return salloc<char> (s); |
|
|
382 | } |
|
|
383 | |
|
|
384 | void *operator new[] (size_t s) |
|
|
385 | { |
|
|
386 | return salloc<char> (s); |
|
|
387 | } |
|
|
388 | |
|
|
389 | void operator delete (void *p, size_t s) |
|
|
390 | { |
|
|
391 | sfree ((char *)p, s); |
|
|
392 | } |
|
|
393 | |
|
|
394 | void operator delete[] (void *p, size_t s) |
|
|
395 | { |
|
|
396 | sfree ((char *)p, s); |
|
|
397 | } |
|
|
398 | }; |
| 208 | |
399 | |
| 209 | // a STL-compatible allocator that uses g_slice |
400 | // a STL-compatible allocator that uses g_slice |
| 210 | // boy, this is verbose |
401 | // boy, this is verbose |
| 211 | template<typename Tp> |
402 | template<typename Tp> |
| 212 | struct slice_allocator |
403 | struct slice_allocator |
| … | |
… | |
| 224 | { |
415 | { |
| 225 | typedef slice_allocator<U> other; |
416 | typedef slice_allocator<U> other; |
| 226 | }; |
417 | }; |
| 227 | |
418 | |
| 228 | slice_allocator () throw () { } |
419 | slice_allocator () throw () { } |
| 229 | slice_allocator (const slice_allocator &o) throw () { } |
420 | slice_allocator (const slice_allocator &) throw () { } |
| 230 | template<typename Tp2> |
421 | template<typename Tp2> |
| 231 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
422 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
| 232 | |
423 | |
| 233 | ~slice_allocator () { } |
424 | ~slice_allocator () { } |
| 234 | |
425 | |
| … | |
… | |
| 243 | void deallocate (pointer p, size_type n) |
434 | void deallocate (pointer p, size_type n) |
| 244 | { |
435 | { |
| 245 | sfree<Tp> (p, n); |
436 | sfree<Tp> (p, n); |
| 246 | } |
437 | } |
| 247 | |
438 | |
| 248 | size_type max_size ()const throw () |
439 | size_type max_size () const throw () |
| 249 | { |
440 | { |
| 250 | return size_t (-1) / sizeof (Tp); |
441 | return size_t (-1) / sizeof (Tp); |
| 251 | } |
442 | } |
| 252 | |
443 | |
| 253 | void construct (pointer p, const Tp &val) |
444 | void construct (pointer p, const Tp &val) |
| … | |
… | |
| 259 | { |
450 | { |
| 260 | p->~Tp (); |
451 | p->~Tp (); |
| 261 | } |
452 | } |
| 262 | }; |
453 | }; |
| 263 | |
454 | |
| 264 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
455 | INTERFACE_CLASS (attachable) |
| 265 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
456 | struct refcnt_base |
| 266 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
|
|
| 267 | struct tausworthe_random_generator |
|
|
| 268 | { |
457 | { |
| 269 | // generator |
458 | typedef int refcnt_t; |
| 270 | uint32_t state [4]; |
459 | mutable refcnt_t ACC (RW, refcnt); |
| 271 | |
460 | |
| 272 | void operator =(const tausworthe_random_generator &src) |
461 | MTH void refcnt_inc () const { ++refcnt; } |
| 273 | { |
462 | MTH void refcnt_dec () const { --refcnt; } |
| 274 | state [0] = src.state [0]; |
|
|
| 275 | state [1] = src.state [1]; |
|
|
| 276 | state [2] = src.state [2]; |
|
|
| 277 | state [3] = src.state [3]; |
|
|
| 278 | } |
|
|
| 279 | |
463 | |
| 280 | void seed (uint32_t seed); |
464 | refcnt_base () : refcnt (0) { } |
| 281 | uint32_t next (); |
|
|
| 282 | |
|
|
| 283 | // uniform distribution |
|
|
| 284 | uint32_t operator ()(uint32_t num) |
|
|
| 285 | { |
|
|
| 286 | return is_constant (num) |
|
|
| 287 | ? (next () * (uint64_t)num) >> 32U |
|
|
| 288 | : get_range (num); |
|
|
| 289 | } |
|
|
| 290 | |
|
|
| 291 | // return a number within (min .. max) |
|
|
| 292 | int operator () (int r_min, int r_max) |
|
|
| 293 | { |
|
|
| 294 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
|
|
| 295 | ? r_min + operator ()(r_max - r_min + 1) |
|
|
| 296 | : get_range (r_min, r_max); |
|
|
| 297 | } |
|
|
| 298 | |
|
|
| 299 | double operator ()() |
|
|
| 300 | { |
|
|
| 301 | return this->next () / (double)0xFFFFFFFFU; |
|
|
| 302 | } |
|
|
| 303 | |
|
|
| 304 | protected: |
|
|
| 305 | uint32_t get_range (uint32_t r_max); |
|
|
| 306 | int get_range (int r_min, int r_max); |
|
|
| 307 | }; |
465 | }; |
| 308 | |
466 | |
| 309 | typedef tausworthe_random_generator rand_gen; |
467 | // to avoid branches with more advanced compilers |
| 310 | |
468 | extern refcnt_base::refcnt_t refcnt_dummy; |
| 311 | extern rand_gen rndm; |
|
|
| 312 | |
469 | |
| 313 | template<class T> |
470 | template<class T> |
| 314 | struct refptr |
471 | struct refptr |
| 315 | { |
472 | { |
|
|
473 | // p if not null |
|
|
474 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
|
|
475 | |
|
|
476 | void refcnt_dec () |
|
|
477 | { |
|
|
478 | if (!is_constant (p)) |
|
|
479 | --*refcnt_ref (); |
|
|
480 | else if (p) |
|
|
481 | --p->refcnt; |
|
|
482 | } |
|
|
483 | |
|
|
484 | void refcnt_inc () |
|
|
485 | { |
|
|
486 | if (!is_constant (p)) |
|
|
487 | ++*refcnt_ref (); |
|
|
488 | else if (p) |
|
|
489 | ++p->refcnt; |
|
|
490 | } |
|
|
491 | |
| 316 | T *p; |
492 | T *p; |
| 317 | |
493 | |
| 318 | refptr () : p(0) { } |
494 | refptr () : p(0) { } |
| 319 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
495 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
| 320 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
496 | refptr (T *p) : p(p) { refcnt_inc (); } |
| 321 | ~refptr () { if (p) p->refcnt_dec (); } |
497 | ~refptr () { refcnt_dec (); } |
| 322 | |
498 | |
| 323 | const refptr<T> &operator =(T *o) |
499 | const refptr<T> &operator =(T *o) |
| 324 | { |
500 | { |
|
|
501 | // if decrementing ever destroys we need to reverse the order here |
| 325 | if (p) p->refcnt_dec (); |
502 | refcnt_dec (); |
| 326 | p = o; |
503 | p = o; |
| 327 | if (p) p->refcnt_inc (); |
504 | refcnt_inc (); |
| 328 | |
|
|
| 329 | return *this; |
505 | return *this; |
| 330 | } |
506 | } |
| 331 | |
507 | |
| 332 | const refptr<T> &operator =(const refptr<T> o) |
508 | const refptr<T> &operator =(const refptr<T> &o) |
| 333 | { |
509 | { |
| 334 | *this = o.p; |
510 | *this = o.p; |
| 335 | return *this; |
511 | return *this; |
| 336 | } |
512 | } |
| 337 | |
513 | |
| 338 | T &operator * () const { return *p; } |
514 | T &operator * () const { return *p; } |
| 339 | T *operator ->() const { return p; } |
515 | T *operator ->() const { return p; } |
| 340 | |
516 | |
| 341 | operator T *() const { return p; } |
517 | operator T *() const { return p; } |
| 342 | }; |
518 | }; |
| 343 | |
519 | |
| 344 | typedef refptr<maptile> maptile_ptr; |
520 | typedef refptr<maptile> maptile_ptr; |
| 345 | typedef refptr<object> object_ptr; |
521 | typedef refptr<object> object_ptr; |
| 346 | typedef refptr<archetype> arch_ptr; |
522 | typedef refptr<archetype> arch_ptr; |
| 347 | typedef refptr<client> client_ptr; |
523 | typedef refptr<client> client_ptr; |
| 348 | typedef refptr<player> player_ptr; |
524 | typedef refptr<player> player_ptr; |
|
|
525 | typedef refptr<region> region_ptr; |
|
|
526 | |
|
|
527 | #define STRHSH_NULL 2166136261 |
|
|
528 | |
|
|
529 | static inline uint32_t |
|
|
530 | strhsh (const char *s) |
|
|
531 | { |
|
|
532 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
533 | // it is about twice as fast as the one-at-a-time one, |
|
|
534 | // with good distribution. |
|
|
535 | // FNV-1a is faster on many cpus because the multiplication |
|
|
536 | // runs concurrently with the looping logic. |
|
|
537 | // we modify the hash a bit to improve its distribution |
|
|
538 | uint32_t hash = STRHSH_NULL; |
|
|
539 | |
|
|
540 | while (*s) |
|
|
541 | hash = (hash ^ *s++) * 16777619U; |
|
|
542 | |
|
|
543 | return hash ^ (hash >> 16); |
|
|
544 | } |
|
|
545 | |
|
|
546 | static inline uint32_t |
|
|
547 | memhsh (const char *s, size_t len) |
|
|
548 | { |
|
|
549 | uint32_t hash = STRHSH_NULL; |
|
|
550 | |
|
|
551 | while (len--) |
|
|
552 | hash = (hash ^ *s++) * 16777619U; |
|
|
553 | |
|
|
554 | return hash; |
|
|
555 | } |
| 349 | |
556 | |
| 350 | struct str_hash |
557 | struct str_hash |
| 351 | { |
558 | { |
| 352 | std::size_t operator ()(const char *s) const |
559 | std::size_t operator ()(const char *s) const |
| 353 | { |
560 | { |
| 354 | unsigned long hash = 0; |
|
|
| 355 | |
|
|
| 356 | /* use the one-at-a-time hash function, which supposedly is |
|
|
| 357 | * better than the djb2-like one used by perl5.005, but |
|
|
| 358 | * certainly is better then the bug used here before. |
|
|
| 359 | * see http://burtleburtle.net/bob/hash/doobs.html |
|
|
| 360 | */ |
|
|
| 361 | while (*s) |
|
|
| 362 | { |
|
|
| 363 | hash += *s++; |
|
|
| 364 | hash += hash << 10; |
|
|
| 365 | hash ^= hash >> 6; |
|
|
| 366 | } |
|
|
| 367 | |
|
|
| 368 | hash += hash << 3; |
|
|
| 369 | hash ^= hash >> 11; |
|
|
| 370 | hash += hash << 15; |
|
|
| 371 | |
|
|
| 372 | return hash; |
561 | return strhsh (s); |
|
|
562 | } |
|
|
563 | |
|
|
564 | std::size_t operator ()(const shstr &s) const |
|
|
565 | { |
|
|
566 | return strhsh (s); |
| 373 | } |
567 | } |
| 374 | }; |
568 | }; |
| 375 | |
569 | |
| 376 | struct str_equal |
570 | struct str_equal |
| 377 | { |
571 | { |
| … | |
… | |
| 379 | { |
573 | { |
| 380 | return !strcmp (a, b); |
574 | return !strcmp (a, b); |
| 381 | } |
575 | } |
| 382 | }; |
576 | }; |
| 383 | |
577 | |
|
|
578 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
579 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
|
|
580 | // |
|
|
581 | // NOTE: only some forms of erase are available |
| 384 | template<class T> |
582 | template<class T> |
| 385 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
583 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
| 386 | { |
584 | { |
| 387 | typedef typename unordered_vector::iterator iterator; |
585 | typedef typename unordered_vector::iterator iterator; |
| 388 | |
586 | |
| … | |
… | |
| 398 | { |
596 | { |
| 399 | erase ((unsigned int )(i - this->begin ())); |
597 | erase ((unsigned int )(i - this->begin ())); |
| 400 | } |
598 | } |
| 401 | }; |
599 | }; |
| 402 | |
600 | |
| 403 | template<class T, int T::* index> |
601 | // This container blends advantages of linked lists |
|
|
602 | // (efficiency) with vectors (random access) by |
|
|
603 | // by using an unordered vector and storing the vector |
|
|
604 | // index inside the object. |
|
|
605 | // |
|
|
606 | // + memory-efficient on most 64 bit archs |
|
|
607 | // + O(1) insert/remove |
|
|
608 | // + free unique (but varying) id for inserted objects |
|
|
609 | // + cache-friendly iteration |
|
|
610 | // - only works for pointers to structs |
|
|
611 | // |
|
|
612 | // NOTE: only some forms of erase/insert are available |
|
|
613 | typedef int object_vector_index; |
|
|
614 | |
|
|
615 | template<class T, object_vector_index T::*indexmember> |
| 404 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
616 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
| 405 | { |
617 | { |
|
|
618 | typedef typename object_vector::iterator iterator; |
|
|
619 | |
|
|
620 | bool contains (const T *obj) const |
|
|
621 | { |
|
|
622 | return obj->*indexmember; |
|
|
623 | } |
|
|
624 | |
|
|
625 | iterator find (const T *obj) |
|
|
626 | { |
|
|
627 | return obj->*indexmember |
|
|
628 | ? this->begin () + obj->*indexmember - 1 |
|
|
629 | : this->end (); |
|
|
630 | } |
|
|
631 | |
|
|
632 | void push_back (T *obj) |
|
|
633 | { |
|
|
634 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
635 | obj->*indexmember = this->size (); |
|
|
636 | } |
|
|
637 | |
| 406 | void insert (T *obj) |
638 | void insert (T *obj) |
| 407 | { |
639 | { |
| 408 | assert (!(obj->*index)); |
|
|
| 409 | push_back (obj); |
640 | push_back (obj); |
| 410 | obj->*index = this->size (); |
|
|
| 411 | } |
641 | } |
| 412 | |
642 | |
| 413 | void insert (T &obj) |
643 | void insert (T &obj) |
| 414 | { |
644 | { |
| 415 | insert (&obj); |
645 | insert (&obj); |
| 416 | } |
646 | } |
| 417 | |
647 | |
| 418 | void erase (T *obj) |
648 | void erase (T *obj) |
| 419 | { |
649 | { |
| 420 | assert (obj->*index); |
|
|
| 421 | unsigned int pos = obj->*index; |
650 | unsigned int pos = obj->*indexmember; |
| 422 | obj->*index = 0; |
651 | obj->*indexmember = 0; |
| 423 | |
652 | |
| 424 | if (pos < this->size ()) |
653 | if (pos < this->size ()) |
| 425 | { |
654 | { |
| 426 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
655 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
| 427 | (*this)[pos - 1]->*index = pos; |
656 | (*this)[pos - 1]->*indexmember = pos; |
| 428 | } |
657 | } |
| 429 | |
658 | |
| 430 | this->pop_back (); |
659 | this->pop_back (); |
| 431 | } |
660 | } |
| 432 | |
661 | |
| 433 | void erase (T &obj) |
662 | void erase (T &obj) |
| 434 | { |
663 | { |
| 435 | errase (&obj); |
664 | erase (&obj); |
| 436 | } |
665 | } |
| 437 | }; |
666 | }; |
|
|
667 | |
|
|
668 | ///////////////////////////////////////////////////////////////////////////// |
|
|
669 | |
|
|
670 | // something like a vector or stack, but without |
|
|
671 | // out of bounds checking |
|
|
672 | template<typename T> |
|
|
673 | struct fixed_stack |
|
|
674 | { |
|
|
675 | T *data; |
|
|
676 | int size; |
|
|
677 | int max; |
|
|
678 | |
|
|
679 | fixed_stack () |
|
|
680 | : size (0), data (0) |
|
|
681 | { |
|
|
682 | } |
|
|
683 | |
|
|
684 | fixed_stack (int max) |
|
|
685 | : size (0), max (max) |
|
|
686 | { |
|
|
687 | data = salloc<T> (max); |
|
|
688 | } |
|
|
689 | |
|
|
690 | void reset (int new_max) |
|
|
691 | { |
|
|
692 | sfree (data, max); |
|
|
693 | size = 0; |
|
|
694 | max = new_max; |
|
|
695 | data = salloc<T> (max); |
|
|
696 | } |
|
|
697 | |
|
|
698 | void free () |
|
|
699 | { |
|
|
700 | sfree (data, max); |
|
|
701 | data = 0; |
|
|
702 | } |
|
|
703 | |
|
|
704 | ~fixed_stack () |
|
|
705 | { |
|
|
706 | sfree (data, max); |
|
|
707 | } |
|
|
708 | |
|
|
709 | T &operator[](int idx) |
|
|
710 | { |
|
|
711 | return data [idx]; |
|
|
712 | } |
|
|
713 | |
|
|
714 | void push (T v) |
|
|
715 | { |
|
|
716 | data [size++] = v; |
|
|
717 | } |
|
|
718 | |
|
|
719 | T &pop () |
|
|
720 | { |
|
|
721 | return data [--size]; |
|
|
722 | } |
|
|
723 | |
|
|
724 | T remove (int idx) |
|
|
725 | { |
|
|
726 | T v = data [idx]; |
|
|
727 | |
|
|
728 | data [idx] = data [--size]; |
|
|
729 | |
|
|
730 | return v; |
|
|
731 | } |
|
|
732 | }; |
|
|
733 | |
|
|
734 | ///////////////////////////////////////////////////////////////////////////// |
| 438 | |
735 | |
| 439 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
736 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
737 | // returns the number of bytes actually used (including \0) |
| 440 | void assign (char *dst, const char *src, int maxlen); |
738 | int assign (char *dst, const char *src, int maxsize); |
| 441 | |
739 | |
| 442 | // type-safe version of assign |
740 | // type-safe version of assign |
| 443 | template<int N> |
741 | template<int N> |
| 444 | inline void assign (char (&dst)[N], const char *src) |
742 | inline int assign (char (&dst)[N], const char *src) |
| 445 | { |
743 | { |
| 446 | assign ((char *)&dst, src, N); |
744 | return assign ((char *)&dst, src, N); |
| 447 | } |
745 | } |
| 448 | |
746 | |
| 449 | typedef double tstamp; |
747 | typedef double tstamp; |
| 450 | |
748 | |
| 451 | // return current time as timestampe |
749 | // return current time as timestamp |
| 452 | tstamp now (); |
750 | tstamp now (); |
| 453 | |
751 | |
| 454 | int similar_direction (int a, int b); |
752 | int similar_direction (int a, int b); |
| 455 | |
753 | |
| 456 | // like printf, but returns a std::string |
754 | // like v?sprintf, but returns a "static" buffer |
| 457 | const std::string format (const char *format, ...); |
755 | char *vformat (const char *format, va_list ap); |
|
|
756 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
| 458 | |
757 | |
|
|
758 | // safety-check player input which will become object->msg |
|
|
759 | bool msg_is_safe (const char *msg); |
|
|
760 | |
|
|
761 | ///////////////////////////////////////////////////////////////////////////// |
|
|
762 | // threads, very very thin wrappers around pthreads |
|
|
763 | |
|
|
764 | struct thread |
|
|
765 | { |
|
|
766 | pthread_t id; |
|
|
767 | |
|
|
768 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
769 | |
|
|
770 | void cancel () |
|
|
771 | { |
|
|
772 | pthread_cancel (id); |
|
|
773 | } |
|
|
774 | |
|
|
775 | void *join () |
|
|
776 | { |
|
|
777 | void *ret; |
|
|
778 | |
|
|
779 | if (pthread_join (id, &ret)) |
|
|
780 | cleanup ("pthread_join failed", 1); |
|
|
781 | |
|
|
782 | return ret; |
|
|
783 | } |
|
|
784 | }; |
|
|
785 | |
|
|
786 | // note that mutexes are not classes |
|
|
787 | typedef pthread_mutex_t smutex; |
|
|
788 | |
|
|
789 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
790 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
791 | #else |
|
|
792 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
| 459 | #endif |
793 | #endif |
| 460 | |
794 | |
|
|
795 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
796 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
797 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
798 | |
|
|
799 | typedef pthread_cond_t scond; |
|
|
800 | |
|
|
801 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
802 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
803 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
804 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
805 | |
|
|
806 | #endif |
|
|
807 | |
