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annotate third_party/luajit/src/lj_func.c @ 190:a2725419f988 hg-web

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Updated so that bun builds will with already existing js files.
author MrJuneJune <me@mrjunejune.com>
date Sat, 24 Jan 2026 21:06:42 -0800
parents 94705b5986b3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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178
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1 /*
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2 ** Function handling (prototypes, functions and upvalues).
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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 ** Portions taken verbatim or adapted from the Lua interpreter.
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6 ** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
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7 */
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8
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9 #define lj_func_c
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10 #define LUA_CORE
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11
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12 #include "lj_obj.h"
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13 #include "lj_gc.h"
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14 #include "lj_func.h"
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15 #include "lj_trace.h"
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16 #include "lj_vm.h"
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17
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18 /* -- Prototypes ---------------------------------------------------------- */
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19
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20 void LJ_FASTCALL lj_func_freeproto(global_State *g, GCproto *pt)
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21 {
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22 lj_mem_free(g, pt, pt->sizept);
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23 }
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24
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25 /* -- Upvalues ------------------------------------------------------------ */
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26
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27 static void unlinkuv(global_State *g, GCupval *uv)
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28 {
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29 UNUSED(g);
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30 lj_assertG(uvprev(uvnext(uv)) == uv && uvnext(uvprev(uv)) == uv,
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31 "broken upvalue chain");
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32 setgcrefr(uvnext(uv)->prev, uv->prev);
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33 setgcrefr(uvprev(uv)->next, uv->next);
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34 }
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35
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36 /* Find existing open upvalue for a stack slot or create a new one. */
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37 static GCupval *func_finduv(lua_State *L, TValue *slot)
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38 {
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39 global_State *g = G(L);
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40 GCRef *pp = &L->openupval;
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41 GCupval *p;
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42 GCupval *uv;
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43 /* Search the sorted list of open upvalues. */
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44 while (gcref(*pp) != NULL && uvval((p = gco2uv(gcref(*pp)))) >= slot) {
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45 lj_assertG(!p->closed && uvval(p) != &p->tv, "closed upvalue in chain");
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46 if (uvval(p) == slot) { /* Found open upvalue pointing to same slot? */
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47 if (isdead(g, obj2gco(p))) /* Resurrect it, if it's dead. */
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48 flipwhite(obj2gco(p));
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49 return p;
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50 }
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51 pp = &p->nextgc;
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52 }
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53 /* No matching upvalue found. Create a new one. */
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54 uv = lj_mem_newt(L, sizeof(GCupval), GCupval);
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55 newwhite(g, uv);
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56 uv->gct = ~LJ_TUPVAL;
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57 uv->closed = 0; /* Still open. */
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58 setmref(uv->v, slot); /* Pointing to the stack slot. */
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59 /* NOBARRIER: The GCupval is new (marked white) and open. */
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60 setgcrefr(uv->nextgc, *pp); /* Insert into sorted list of open upvalues. */
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61 setgcref(*pp, obj2gco(uv));
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62 setgcref(uv->prev, obj2gco(&g->uvhead)); /* Insert into GC list, too. */
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63 setgcrefr(uv->next, g->uvhead.next);
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64 setgcref(uvnext(uv)->prev, obj2gco(uv));
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65 setgcref(g->uvhead.next, obj2gco(uv));
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66 lj_assertG(uvprev(uvnext(uv)) == uv && uvnext(uvprev(uv)) == uv,
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67 "broken upvalue chain");
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68 return uv;
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69 }
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70
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71 /* Create an empty and closed upvalue. */
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72 static GCupval *func_emptyuv(lua_State *L)
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73 {
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74 GCupval *uv = (GCupval *)lj_mem_newgco(L, sizeof(GCupval));
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75 uv->gct = ~LJ_TUPVAL;
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76 uv->closed = 1;
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77 setnilV(&uv->tv);
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78 setmref(uv->v, &uv->tv);
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79 return uv;
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80 }
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81
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82 /* Close all open upvalues pointing to some stack level or above. */
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83 void LJ_FASTCALL lj_func_closeuv(lua_State *L, TValue *level)
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84 {
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85 GCupval *uv;
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86 global_State *g = G(L);
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87 while (gcref(L->openupval) != NULL &&
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88 uvval((uv = gco2uv(gcref(L->openupval)))) >= level) {
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89 GCobj *o = obj2gco(uv);
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90 lj_assertG(!isblack(o), "bad black upvalue");
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91 lj_assertG(!uv->closed && uvval(uv) != &uv->tv, "closed upvalue in chain");
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92 setgcrefr(L->openupval, uv->nextgc); /* No longer in open list. */
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93 if (isdead(g, o)) {
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94 lj_func_freeuv(g, uv);
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95 } else {
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96 unlinkuv(g, uv);
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97 lj_gc_closeuv(g, uv);
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98 }
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99 }
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100 }
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101
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102 void LJ_FASTCALL lj_func_freeuv(global_State *g, GCupval *uv)
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103 {
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104 if (!uv->closed)
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105 unlinkuv(g, uv);
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106 lj_mem_freet(g, uv);
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107 }
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108
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109 /* -- Functions (closures) ------------------------------------------------ */
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110
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111 GCfunc *lj_func_newC(lua_State *L, MSize nelems, GCtab *env)
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112 {
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113 GCfunc *fn = (GCfunc *)lj_mem_newgco(L, sizeCfunc(nelems));
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114 fn->c.gct = ~LJ_TFUNC;
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115 fn->c.ffid = FF_C;
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116 fn->c.nupvalues = (uint8_t)nelems;
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117 /* NOBARRIER: The GCfunc is new (marked white). */
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118 setmref(fn->c.pc, &G(L)->bc_cfunc_ext);
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119 setgcref(fn->c.env, obj2gco(env));
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120 return fn;
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121 }
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122
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123 static GCfunc *func_newL(lua_State *L, GCproto *pt, GCtab *env)
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124 {
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125 uint32_t count;
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126 GCfunc *fn = (GCfunc *)lj_mem_newgco(L, sizeLfunc((MSize)pt->sizeuv));
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127 fn->l.gct = ~LJ_TFUNC;
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128 fn->l.ffid = FF_LUA;
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129 fn->l.nupvalues = 0; /* Set to zero until upvalues are initialized. */
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130 /* NOBARRIER: Really a setgcref. But the GCfunc is new (marked white). */
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131 setmref(fn->l.pc, proto_bc(pt));
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132 setgcref(fn->l.env, obj2gco(env));
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133 /* Saturating 3 bit counter (0..7) for created closures. */
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134 count = (uint32_t)pt->flags + PROTO_CLCOUNT;
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135 pt->flags = (uint8_t)(count - ((count >> PROTO_CLC_BITS) & PROTO_CLCOUNT));
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136 return fn;
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137 }
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138
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139 /* Create a new Lua function with empty upvalues. */
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140 GCfunc *lj_func_newL_empty(lua_State *L, GCproto *pt, GCtab *env)
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141 {
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142 GCfunc *fn = func_newL(L, pt, env);
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143 MSize i, nuv = pt->sizeuv;
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144 /* NOBARRIER: The GCfunc is new (marked white). */
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145 for (i = 0; i < nuv; i++) {
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146 GCupval *uv = func_emptyuv(L);
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147 int32_t v = proto_uv(pt)[i];
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148 uv->immutable = ((v / PROTO_UV_IMMUTABLE) & 1);
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149 uv->dhash = (uint32_t)(uintptr_t)pt ^ (v << 24);
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150 setgcref(fn->l.uvptr[i], obj2gco(uv));
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151 }
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152 fn->l.nupvalues = (uint8_t)nuv;
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153 return fn;
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154 }
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155
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156 /* Do a GC check and create a new Lua function with inherited upvalues. */
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157 GCfunc *lj_func_newL_gc(lua_State *L, GCproto *pt, GCfuncL *parent)
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158 {
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159 GCfunc *fn;
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160 GCRef *puv;
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161 MSize i, nuv;
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162 TValue *base;
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163 lj_gc_check_fixtop(L);
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164 fn = func_newL(L, pt, tabref(parent->env));
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165 /* NOBARRIER: The GCfunc is new (marked white). */
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166 puv = parent->uvptr;
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167 nuv = pt->sizeuv;
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168 base = L->base;
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169 for (i = 0; i < nuv; i++) {
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170 uint32_t v = proto_uv(pt)[i];
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171 GCupval *uv;
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172 if ((v & PROTO_UV_LOCAL)) {
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173 uv = func_finduv(L, base + (v & 0xff));
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174 uv->immutable = ((v / PROTO_UV_IMMUTABLE) & 1);
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175 uv->dhash = (uint32_t)(uintptr_t)mref(parent->pc, char) ^ (v << 24);
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176 } else {
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177 uv = &gcref(puv[v])->uv;
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178 }
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179 setgcref(fn->l.uvptr[i], obj2gco(uv));
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180 }
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181 fn->l.nupvalues = (uint8_t)nuv;
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182 return fn;
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183 }
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184
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185 void LJ_FASTCALL lj_func_free(global_State *g, GCfunc *fn)
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186 {
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187 MSize size = isluafunc(fn) ? sizeLfunc((MSize)fn->l.nupvalues) :
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188 sizeCfunc((MSize)fn->c.nupvalues);
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189 lj_mem_free(g, fn, size);
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190 }
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191