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Added AI genreated README.md. Needed to be read.
author MrJuneJune <me@mrjunejune.com>
date Sat, 24 Jan 2026 21:52:14 -0800
parents 94705b5986b3
children
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178
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1 /*
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2 ** Instruction dispatch handling.
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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 #ifndef _LJ_DISPATCH_H
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7 #define _LJ_DISPATCH_H
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8
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9 #include "lj_obj.h"
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10 #include "lj_bc.h"
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11 #if LJ_HASJIT
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12 #include "lj_jit.h"
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13 #endif
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14
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15 #if LJ_TARGET_MIPS
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16 /* Need our own global offset table for the dreaded MIPS calling conventions. */
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17
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18 #ifndef _LJ_VM_H
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19 LJ_ASMF int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b);
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20 #endif
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21
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22 #if LJ_SOFTFP
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23 #ifndef _LJ_IRCALL_H
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24 extern double __adddf3(double a, double b);
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25 extern double __subdf3(double a, double b);
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26 extern double __muldf3(double a, double b);
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27 extern double __divdf3(double a, double b);
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28 #endif
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29 #define SFGOTDEF(_) _(sqrt) _(__adddf3) _(__subdf3) _(__muldf3) _(__divdf3)
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30 #else
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31 #define SFGOTDEF(_)
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32 #endif
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33 #if LJ_HASJIT
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34 #define JITGOTDEF(_) _(lj_err_trace) _(lj_trace_exit) _(lj_trace_hot)
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35 #else
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36 #define JITGOTDEF(_)
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37 #endif
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38 #if LJ_HASFFI
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39 #define FFIGOTDEF(_) \
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40 _(lj_meta_equal_cd) _(lj_ccallback_enter) _(lj_ccallback_leave)
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41 #else
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42 #define FFIGOTDEF(_)
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43 #endif
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44 #define GOTDEF(_) \
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45 _(floor) _(ceil) _(trunc) _(log) _(log10) _(exp) _(sin) _(cos) _(tan) \
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46 _(asin) _(acos) _(atan) _(sinh) _(cosh) _(tanh) _(frexp) _(modf) _(atan2) \
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47 _(pow) _(fmod) _(ldexp) _(lj_vm_modi) \
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48 _(lj_dispatch_call) _(lj_dispatch_ins) _(lj_dispatch_stitch) \
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49 _(lj_dispatch_profile) _(lj_err_throw) \
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50 _(lj_ffh_coroutine_wrap_err) _(lj_func_closeuv) _(lj_func_newL_gc) \
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51 _(lj_gc_barrieruv) _(lj_gc_step) _(lj_gc_step_fixtop) _(lj_meta_arith) \
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52 _(lj_meta_call) _(lj_meta_cat) _(lj_meta_comp) _(lj_meta_equal) \
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53 _(lj_meta_for) _(lj_meta_istype) _(lj_meta_len) _(lj_meta_tget) \
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54 _(lj_meta_tset) _(lj_state_growstack) _(lj_strfmt_number) \
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55 _(lj_str_new) _(lj_tab_dup) _(lj_tab_get) _(lj_tab_getinth) _(lj_tab_len) \
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56 _(lj_tab_new) _(lj_tab_newkey) _(lj_tab_next) _(lj_tab_reasize) \
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57 _(lj_tab_setinth) _(lj_buf_putstr_reverse) _(lj_buf_putstr_lower) \
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58 _(lj_buf_putstr_upper) _(lj_buf_tostr) \
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59 JITGOTDEF(_) FFIGOTDEF(_) SFGOTDEF(_)
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60
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61 enum {
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62 #define GOTENUM(name) LJ_GOT_##name,
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63 GOTDEF(GOTENUM)
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64 #undef GOTENUM
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65 LJ_GOT__MAX
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66 };
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67 #endif
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68
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69 /* Type of hot counter. Must match the code in the assembler VM. */
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70 /* 16 bits are sufficient. Only 0.0015% overhead with maximum slot penalty. */
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71 typedef uint16_t HotCount;
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72
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73 /* Number of hot counter hash table entries (must be a power of two). */
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74 #define HOTCOUNT_SIZE 64
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75 #define HOTCOUNT_PCMASK ((HOTCOUNT_SIZE-1)*sizeof(HotCount))
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76
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77 /* Hotcount decrements. */
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78 #define HOTCOUNT_LOOP 2
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79 #define HOTCOUNT_CALL 1
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80
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81 /* This solves a circular dependency problem -- bump as needed. Sigh. */
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82 #define GG_NUM_ASMFF 57
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83
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84 #define GG_LEN_DDISP (BC__MAX + GG_NUM_ASMFF)
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85 #define GG_LEN_SDISP BC_FUNCF
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86 #define GG_LEN_DISP (GG_LEN_DDISP + GG_LEN_SDISP)
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87
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88 /* Global state, main thread and extra fields are allocated together. */
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89 typedef struct GG_State {
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90 lua_State L; /* Main thread. */
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91 global_State g; /* Global state. */
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92 #if LJ_TARGET_ARM && !LJ_TARGET_NX
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93 /* Make g reachable via K12 encoded DISPATCH-relative addressing. */
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94 uint8_t align1[(16-sizeof(global_State))&15];
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95 #endif
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96 #if LJ_TARGET_MIPS
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97 ASMFunction got[LJ_GOT__MAX]; /* Global offset table. */
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98 #endif
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99 #if LJ_HASJIT
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100 jit_State J; /* JIT state. */
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101 HotCount hotcount[HOTCOUNT_SIZE]; /* Hot counters. */
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102 #if LJ_TARGET_ARM && !LJ_TARGET_NX
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103 /* Ditto for J. */
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104 uint8_t align2[(16-sizeof(jit_State)-sizeof(HotCount)*HOTCOUNT_SIZE)&15];
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105 #endif
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106 #endif
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107 ASMFunction dispatch[GG_LEN_DISP]; /* Instruction dispatch tables. */
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108 BCIns bcff[GG_NUM_ASMFF]; /* Bytecode for ASM fast functions. */
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109 } GG_State;
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110
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111 #define GG_OFS(field) ((int)offsetof(GG_State, field))
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112 #define G2GG(gl) ((GG_State *)((char *)(gl) - GG_OFS(g)))
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113 #define J2GG(j) ((GG_State *)((char *)(j) - GG_OFS(J)))
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114 #define L2GG(L) (G2GG(G(L)))
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115 #define J2G(J) (&J2GG(J)->g)
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116 #define G2J(gl) (&G2GG(gl)->J)
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117 #define L2J(L) (&L2GG(L)->J)
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118 #define GG_G2J (GG_OFS(J) - GG_OFS(g))
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119 #define GG_G2DISP (GG_OFS(dispatch) - GG_OFS(g))
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120 #define GG_DISP2G (GG_OFS(g) - GG_OFS(dispatch))
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121 #define GG_DISP2J (GG_OFS(J) - GG_OFS(dispatch))
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122 #define GG_DISP2HOT (GG_OFS(hotcount) - GG_OFS(dispatch))
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123 #define GG_DISP2STATIC (GG_LEN_DDISP*(int)sizeof(ASMFunction))
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124
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125 #define hotcount_get(gg, pc) \
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126 (gg)->hotcount[(u32ptr(pc)>>2) & (HOTCOUNT_SIZE-1)]
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127 #define hotcount_set(gg, pc, val) \
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128 (hotcount_get((gg), (pc)) = (HotCount)(val))
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129
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130 /* Dispatch table management. */
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131 LJ_FUNC void lj_dispatch_init(GG_State *GG);
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132 #if LJ_HASJIT
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133 LJ_FUNC void lj_dispatch_init_hotcount(global_State *g);
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134 #endif
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135 LJ_FUNC void lj_dispatch_update(global_State *g);
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136
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137 /* Instruction dispatch callback for hooks or when recording. */
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138 LJ_FUNCA void LJ_FASTCALL lj_dispatch_ins(lua_State *L, const BCIns *pc);
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139 LJ_FUNCA ASMFunction LJ_FASTCALL lj_dispatch_call(lua_State *L, const BCIns*pc);
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140 #if LJ_HASJIT
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141 LJ_FUNCA void LJ_FASTCALL lj_dispatch_stitch(jit_State *J, const BCIns *pc);
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142 #endif
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143 #if LJ_HASPROFILE
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144 LJ_FUNCA void LJ_FASTCALL lj_dispatch_profile(lua_State *L, const BCIns *pc);
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145 #endif
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146
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147 #if LJ_HASFFI && !defined(_BUILDVM_H)
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148 /* Save/restore errno and GetLastError() around hooks, exits and recording. */
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149 #include <errno.h>
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150 #if LJ_TARGET_WINDOWS
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151 #define WIN32_LEAN_AND_MEAN
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152 #include <windows.h>
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153 #define ERRNO_SAVE int olderr = errno; DWORD oldwerr = GetLastError();
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154 #define ERRNO_RESTORE errno = olderr; SetLastError(oldwerr);
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155 #else
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156 #define ERRNO_SAVE int olderr = errno;
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157 #define ERRNO_RESTORE errno = olderr;
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158 #endif
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159 #else
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160 #define ERRNO_SAVE
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161 #define ERRNO_RESTORE
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162 #endif
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163
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164 #endif