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annotate third_party/luajit/src/lj_func.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
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