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annotate third_party/luajit/src/lib_math.c @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
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