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annotate third_party/luajit/src/lj_gc.h @ 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 ** Garbage collector.
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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_GC_H
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7 #define _LJ_GC_H
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8
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9 #include "lj_obj.h"
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10
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11 /* Garbage collector states. Order matters. */
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12 enum {
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13 GCSpause, GCSpropagate, GCSatomic, GCSsweepstring, GCSsweep, GCSfinalize
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14 };
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15
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16 /* Bitmasks for marked field of GCobj. */
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17 #define LJ_GC_WHITE0 0x01
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18 #define LJ_GC_WHITE1 0x02
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19 #define LJ_GC_BLACK 0x04
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20 #define LJ_GC_FINALIZED 0x08
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21 #define LJ_GC_WEAKKEY 0x08
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22 #define LJ_GC_WEAKVAL 0x10
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23 #define LJ_GC_CDATA_FIN 0x10
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24 #define LJ_GC_FIXED 0x20
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25 #define LJ_GC_SFIXED 0x40
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26
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27 #define LJ_GC_WHITES (LJ_GC_WHITE0 | LJ_GC_WHITE1)
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28 #define LJ_GC_COLORS (LJ_GC_WHITES | LJ_GC_BLACK)
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29 #define LJ_GC_WEAK (LJ_GC_WEAKKEY | LJ_GC_WEAKVAL)
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30
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31 /* Macros to test and set GCobj colors. */
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32 #define iswhite(x) ((x)->gch.marked & LJ_GC_WHITES)
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33 #define isblack(x) ((x)->gch.marked & LJ_GC_BLACK)
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34 #define isgray(x) (!((x)->gch.marked & (LJ_GC_BLACK|LJ_GC_WHITES)))
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35 #define tviswhite(x) (tvisgcv(x) && iswhite(gcV(x)))
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36 #define otherwhite(g) (g->gc.currentwhite ^ LJ_GC_WHITES)
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37 #define isdead(g, v) ((v)->gch.marked & otherwhite(g) & LJ_GC_WHITES)
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38
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39 #define curwhite(g) ((g)->gc.currentwhite & LJ_GC_WHITES)
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40 #define newwhite(g, x) (obj2gco(x)->gch.marked = (uint8_t)curwhite(g))
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41 #define makewhite(g, x) \
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42 ((x)->gch.marked = ((x)->gch.marked & (uint8_t)~LJ_GC_COLORS) | curwhite(g))
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43 #define flipwhite(x) ((x)->gch.marked ^= LJ_GC_WHITES)
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44 #define black2gray(x) ((x)->gch.marked &= (uint8_t)~LJ_GC_BLACK)
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45 #define fixstring(s) ((s)->marked |= LJ_GC_FIXED)
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46 #define markfinalized(x) ((x)->gch.marked |= LJ_GC_FINALIZED)
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47
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48 /* Collector. */
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49 LJ_FUNC size_t lj_gc_separateudata(global_State *g, int all);
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50 LJ_FUNC void lj_gc_finalize_udata(lua_State *L);
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51 #if LJ_HASFFI
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52 LJ_FUNC void lj_gc_finalize_cdata(lua_State *L);
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53 #else
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54 #define lj_gc_finalize_cdata(L) UNUSED(L)
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55 #endif
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56 LJ_FUNC void lj_gc_freeall(global_State *g);
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57 LJ_FUNCA int LJ_FASTCALL lj_gc_step(lua_State *L);
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58 LJ_FUNCA void LJ_FASTCALL lj_gc_step_fixtop(lua_State *L);
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59 #if LJ_HASJIT
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60 LJ_FUNC int LJ_FASTCALL lj_gc_step_jit(global_State *g, MSize steps);
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61 #endif
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62 LJ_FUNC void lj_gc_fullgc(lua_State *L);
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63
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64 /* GC check: drive collector forward if the GC threshold has been reached. */
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65 #define lj_gc_check(L) \
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66 { if (LJ_UNLIKELY(G(L)->gc.total >= G(L)->gc.threshold)) \
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67 lj_gc_step(L); }
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68 #define lj_gc_check_fixtop(L) \
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69 { if (LJ_UNLIKELY(G(L)->gc.total >= G(L)->gc.threshold)) \
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70 lj_gc_step_fixtop(L); }
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71
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72 /* Write barriers. */
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73 LJ_FUNC void lj_gc_barrierf(global_State *g, GCobj *o, GCobj *v);
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74 LJ_FUNCA void LJ_FASTCALL lj_gc_barrieruv(global_State *g, TValue *tv);
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75 LJ_FUNC void lj_gc_closeuv(global_State *g, GCupval *uv);
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76 #if LJ_HASJIT
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77 LJ_FUNC void lj_gc_barriertrace(global_State *g, uint32_t traceno);
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78 #endif
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79
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80 /* Move the GC propagation frontier back for tables (make it gray again). */
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81 static LJ_AINLINE void lj_gc_barrierback(global_State *g, GCtab *t)
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82 {
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83 GCobj *o = obj2gco(t);
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84 lj_assertG(isblack(o) && !isdead(g, o),
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85 "bad object states for backward barrier");
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86 lj_assertG(g->gc.state != GCSfinalize && g->gc.state != GCSpause,
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87 "bad GC state");
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88 black2gray(o);
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89 setgcrefr(t->gclist, g->gc.grayagain);
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90 setgcref(g->gc.grayagain, o);
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91 }
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92
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93 /* Barrier for stores to table objects. TValue and GCobj variant. */
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94 #define lj_gc_anybarriert(L, t) \
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95 { if (LJ_UNLIKELY(isblack(obj2gco(t)))) lj_gc_barrierback(G(L), (t)); }
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96 #define lj_gc_barriert(L, t, tv) \
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97 { if (tviswhite(tv) && isblack(obj2gco(t))) \
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98 lj_gc_barrierback(G(L), (t)); }
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99 #define lj_gc_objbarriert(L, t, o) \
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100 { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) \
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101 lj_gc_barrierback(G(L), (t)); }
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102
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103 /* Barrier for stores to any other object. TValue and GCobj variant. */
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104 #define lj_gc_barrier(L, p, tv) \
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105 { if (tviswhite(tv) && isblack(obj2gco(p))) \
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106 lj_gc_barrierf(G(L), obj2gco(p), gcV(tv)); }
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107 #define lj_gc_objbarrier(L, p, o) \
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108 { if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
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109 lj_gc_barrierf(G(L), obj2gco(p), obj2gco(o)); }
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110
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111 /* Allocator. */
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112 LJ_FUNC void *lj_mem_realloc(lua_State *L, void *p, GCSize osz, GCSize nsz);
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113 LJ_FUNC void * LJ_FASTCALL lj_mem_newgco(lua_State *L, GCSize size);
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114 LJ_FUNC void *lj_mem_grow(lua_State *L, void *p,
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115 MSize *szp, MSize lim, MSize esz);
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116
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117 #define lj_mem_new(L, s) lj_mem_realloc(L, NULL, 0, (s))
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118
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119 static LJ_AINLINE void lj_mem_free(global_State *g, void *p, size_t osize)
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120 {
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121 g->gc.total -= (GCSize)osize;
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122 g->allocf(g->allocd, p, osize, 0);
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123 }
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124
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125 #define lj_mem_newvec(L, n, t) ((t *)lj_mem_new(L, (GCSize)((n)*sizeof(t))))
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126 #define lj_mem_reallocvec(L, p, on, n, t) \
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127 ((p) = (t *)lj_mem_realloc(L, p, (on)*sizeof(t), (GCSize)((n)*sizeof(t))))
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128 #define lj_mem_growvec(L, p, n, m, t) \
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129 ((p) = (t *)lj_mem_grow(L, (p), &(n), (m), (MSize)sizeof(t)))
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130 #define lj_mem_freevec(g, p, n, t) lj_mem_free(g, (p), (n)*sizeof(t))
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131
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132 #define lj_mem_newobj(L, t) ((t *)lj_mem_newgco(L, sizeof(t)))
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133 #define lj_mem_newt(L, s, t) ((t *)lj_mem_new(L, (s)))
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134 #define lj_mem_freet(g, p) lj_mem_free(g, (p), sizeof(*(p)))
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135
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136 #endif