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annotate third_party/luajit/src/lib_math.c @ 213:60918f88070e

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Simple change regarding to accessibility.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 21:39:43 -0800
parents 94705b5986b3
children
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178
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1 /*
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2 ** Math library.
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
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4 */
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5
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6 #include <math.h>
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7
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8 #define lib_math_c
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9 #define LUA_LIB
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10
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11 #include "lua.h"
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12 #include "lauxlib.h"
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13 #include "lualib.h"
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14
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15 #include "lj_obj.h"
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16 #include "lj_lib.h"
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17 #include "lj_vm.h"
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18 #include "lj_prng.h"
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19
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20 /* ------------------------------------------------------------------------ */
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21
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22 #define LJLIB_MODULE_math
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23
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24 LJLIB_ASM(math_abs) LJLIB_REC(.)
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25 {
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26 lj_lib_checknumber(L, 1);
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27 return FFH_RETRY;
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28 }
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29 LJLIB_ASM_(math_floor) LJLIB_REC(math_round IRFPM_FLOOR)
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30 LJLIB_ASM_(math_ceil) LJLIB_REC(math_round IRFPM_CEIL)
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31
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32 LJLIB_ASM(math_sqrt) LJLIB_REC(math_unary IRFPM_SQRT)
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33 {
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34 lj_lib_checknum(L, 1);
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35 return FFH_RETRY;
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36 }
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37 LJLIB_ASM_(math_log10) LJLIB_REC(math_call IRCALL_log10)
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38 LJLIB_ASM_(math_exp) LJLIB_REC(math_call IRCALL_exp)
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39 LJLIB_ASM_(math_sin) LJLIB_REC(math_call IRCALL_sin)
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40 LJLIB_ASM_(math_cos) LJLIB_REC(math_call IRCALL_cos)
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41 LJLIB_ASM_(math_tan) LJLIB_REC(math_call IRCALL_tan)
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42 LJLIB_ASM_(math_asin) LJLIB_REC(math_call IRCALL_asin)
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43 LJLIB_ASM_(math_acos) LJLIB_REC(math_call IRCALL_acos)
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44 LJLIB_ASM_(math_atan) LJLIB_REC(math_call IRCALL_atan)
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45 LJLIB_ASM_(math_sinh) LJLIB_REC(math_call IRCALL_sinh)
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46 LJLIB_ASM_(math_cosh) LJLIB_REC(math_call IRCALL_cosh)
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47 LJLIB_ASM_(math_tanh) LJLIB_REC(math_call IRCALL_tanh)
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48 LJLIB_ASM_(math_frexp)
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49 LJLIB_ASM_(math_modf)
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50
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51 LJLIB_ASM(math_log) LJLIB_REC(math_log)
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52 {
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53 double x = lj_lib_checknum(L, 1);
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54 if (L->base+1 < L->top) {
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55 double y = lj_lib_checknum(L, 2);
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56 #ifdef LUAJIT_NO_LOG2
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57 x = log(x); y = 1.0 / log(y);
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58 #else
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59 x = lj_vm_log2(x); y = 1.0 / lj_vm_log2(y);
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60 #endif
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61 setnumV(L->base-1-LJ_FR2, x*y); /* Do NOT join the expression to x / y. */
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62 return FFH_RES(1);
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63 }
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64 return FFH_RETRY;
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65 }
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66
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67 LJLIB_LUA(math_deg) /* function(x) return x * 57.29577951308232 end */
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68 LJLIB_LUA(math_rad) /* function(x) return x * 0.017453292519943295 end */
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69
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70 LJLIB_ASM(math_atan2) LJLIB_REC(.)
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71 {
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72 lj_lib_checknum(L, 1);
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73 lj_lib_checknum(L, 2);
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74 return FFH_RETRY;
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75 }
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76 LJLIB_ASM_(math_pow) LJLIB_REC(.)
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77 LJLIB_ASM_(math_fmod)
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78
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79 LJLIB_ASM(math_ldexp) LJLIB_REC(.)
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80 {
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81 lj_lib_checknum(L, 1);
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82 #if LJ_DUALNUM && !LJ_TARGET_X86ORX64
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83 lj_lib_checkint(L, 2);
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84 #else
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85 lj_lib_checknum(L, 2);
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86 #endif
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87 return FFH_RETRY;
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88 }
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89
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90 LJLIB_ASM(math_min) LJLIB_REC(math_minmax IR_MIN)
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91 {
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92 int i = 0;
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93 do { lj_lib_checknumber(L, ++i); } while (L->base+i < L->top);
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94 return FFH_RETRY;
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95 }
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96 LJLIB_ASM_(math_max) LJLIB_REC(math_minmax IR_MAX)
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97
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98 LJLIB_PUSH(3.14159265358979323846) LJLIB_SET(pi)
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99 LJLIB_PUSH(1e310) LJLIB_SET(huge)
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100
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101 /* ------------------------------------------------------------------------ */
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102
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103 /* This implements a Tausworthe PRNG with period 2^223. Based on:
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104 ** Tables of maximally-equidistributed combined LFSR generators,
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105 ** Pierre L'Ecuyer, 1991, table 3, 1st entry.
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106 ** Full-period ME-CF generator with L=64, J=4, k=223, N1=49.
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107 */
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108
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109 /* Union needed for bit-pattern conversion between uint64_t and double. */
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110 typedef union { uint64_t u64; double d; } U64double;
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111
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112 /* PRNG seeding function. */
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113 static void random_seed(PRNGState *rs, double d)
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114 {
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115 uint32_t r = 0x11090601; /* 64-k[i] as four 8 bit constants. */
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116 int i;
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117 for (i = 0; i < 4; i++) {
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118 U64double u;
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119 uint32_t m = 1u << (r&255);
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120 r >>= 8;
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121 u.d = d = d * 3.14159265358979323846 + 2.7182818284590452354;
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122 if (u.u64 < m) u.u64 += m; /* Ensure k[i] MSB of u[i] are non-zero. */
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123 rs->u[i] = u.u64;
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124 }
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125 for (i = 0; i < 10; i++)
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126 (void)lj_prng_u64(rs);
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127 }
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128
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129 /* PRNG extract function. */
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130 LJLIB_PUSH(top-2) /* Upvalue holds userdata with PRNGState. */
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131 LJLIB_CF(math_random) LJLIB_REC(.)
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132 {
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133 int n = (int)(L->top - L->base);
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134 PRNGState *rs = (PRNGState *)(uddata(udataV(lj_lib_upvalue(L, 1))));
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135 U64double u;
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136 double d;
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137 u.u64 = lj_prng_u64d(rs);
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138 d = u.d - 1.0;
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139 if (n > 0) {
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140 #if LJ_DUALNUM
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141 int isint = 1;
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142 double r1;
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143 lj_lib_checknumber(L, 1);
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144 if (tvisint(L->base)) {
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145 r1 = (lua_Number)intV(L->base);
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146 } else {
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147 isint = 0;
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148 r1 = numV(L->base);
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149 }
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150 #else
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151 double r1 = lj_lib_checknum(L, 1);
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152 #endif
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153 if (n == 1) {
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154 d = lj_vm_floor(d*r1) + 1.0; /* d is an int in range [1, r1] */
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155 } else {
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156 #if LJ_DUALNUM
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157 double r2;
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158 lj_lib_checknumber(L, 2);
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159 if (tvisint(L->base+1)) {
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160 r2 = (lua_Number)intV(L->base+1);
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161 } else {
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162 isint = 0;
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163 r2 = numV(L->base+1);
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164 }
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165 #else
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166 double r2 = lj_lib_checknum(L, 2);
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167 #endif
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168 d = lj_vm_floor(d*(r2-r1+1.0)) + r1; /* d is an int in range [r1, r2] */
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169 }
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170 #if LJ_DUALNUM
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171 if (isint) {
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172 setintV(L->top-1, lj_num2int(d));
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173 return 1;
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174 }
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175 #endif
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176 } /* else: d is a double in range [0, 1] */
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177 setnumV(L->top++, d);
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178 return 1;
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179 }
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180
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181 /* PRNG seed function. */
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182 LJLIB_PUSH(top-2) /* Upvalue holds userdata with PRNGState. */
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183 LJLIB_CF(math_randomseed)
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184 {
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185 PRNGState *rs = (PRNGState *)(uddata(udataV(lj_lib_upvalue(L, 1))));
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186 random_seed(rs, lj_lib_checknum(L, 1));
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187 return 0;
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188 }
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189
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190 /* ------------------------------------------------------------------------ */
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191
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192 #include "lj_libdef.h"
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193
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194 LUALIB_API int luaopen_math(lua_State *L)
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195 {
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196 PRNGState *rs = (PRNGState *)lua_newuserdata(L, sizeof(PRNGState));
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197 lj_prng_seed_fixed(rs);
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198 LJ_LIB_REG(L, LUA_MATHLIBNAME, math);
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199 return 1;
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200 }
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201