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annotate third_party/luajit/src/lj_tab.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
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178
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1 /*
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2 ** Table 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_TAB_H
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7 #define _LJ_TAB_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 /* Hash constants. Tuned using a brute force search. */
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12 #define HASH_BIAS (-0x04c11db7)
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13 #define HASH_ROT1 14
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14 #define HASH_ROT2 5
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15 #define HASH_ROT3 13
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16
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17 /* Scramble the bits of numbers and pointers. */
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18 static LJ_AINLINE uint32_t hashrot(uint32_t lo, uint32_t hi)
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19 {
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20 #if LJ_TARGET_X86ORX64
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21 /* Prefer variant that compiles well for a 2-operand CPU. */
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22 lo ^= hi; hi = lj_rol(hi, HASH_ROT1);
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23 lo -= hi; hi = lj_rol(hi, HASH_ROT2);
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24 hi ^= lo; hi -= lj_rol(lo, HASH_ROT3);
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25 #else
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26 lo ^= hi;
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27 lo = lo - lj_rol(hi, HASH_ROT1);
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28 hi = lo ^ lj_rol(hi, HASH_ROT1 + HASH_ROT2);
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29 hi = hi - lj_rol(lo, HASH_ROT3);
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30 #endif
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31 return hi;
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32 }
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33
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34 /* Hash values are masked with the table hash mask and used as an index. */
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35 static LJ_AINLINE Node *hashmask(const GCtab *t, uint32_t hash)
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36 {
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37 Node *n = noderef(t->node);
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38 return &n[hash & t->hmask];
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39 }
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40
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41 /* String IDs are generated when a string is interned. */
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42 #define hashstr(t, s) hashmask(t, (s)->sid)
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43
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44 #define hashlohi(t, lo, hi) hashmask((t), hashrot((lo), (hi)))
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45 #define hashnum(t, o) hashlohi((t), (o)->u32.lo, ((o)->u32.hi << 1))
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46 #if LJ_GC64
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47 #define hashgcref(t, r) \
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48 hashlohi((t), (uint32_t)gcrefu(r), (uint32_t)(gcrefu(r) >> 32))
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49 #else
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50 #define hashgcref(t, r) hashlohi((t), gcrefu(r), gcrefu(r) + HASH_BIAS)
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51 #endif
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52
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53 #define hsize2hbits(s) ((s) ? ((s)==1 ? 1 : 1+lj_fls((uint32_t)((s)-1))) : 0)
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54
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55 LJ_FUNCA GCtab *lj_tab_new(lua_State *L, uint32_t asize, uint32_t hbits);
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56 LJ_FUNC GCtab *lj_tab_new_ah(lua_State *L, int32_t a, int32_t h);
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57 #if LJ_HASJIT
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58 LJ_FUNC GCtab * LJ_FASTCALL lj_tab_new1(lua_State *L, uint32_t ahsize);
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59 #endif
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60 LJ_FUNCA GCtab * LJ_FASTCALL lj_tab_dup(lua_State *L, const GCtab *kt);
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61 LJ_FUNC void LJ_FASTCALL lj_tab_clear(GCtab *t);
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62 LJ_FUNC void LJ_FASTCALL lj_tab_free(global_State *g, GCtab *t);
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63 #if LJ_HASFFI
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64 LJ_FUNC void lj_tab_rehash(lua_State *L, GCtab *t);
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65 #endif
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66 LJ_FUNC void lj_tab_resize(lua_State *L, GCtab *t, uint32_t asize, uint32_t hbits);
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67 LJ_FUNCA void lj_tab_reasize(lua_State *L, GCtab *t, uint32_t nasize);
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68
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69 /* Caveat: all getters except lj_tab_get() can return NULL! */
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70
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71 LJ_FUNCA cTValue * LJ_FASTCALL lj_tab_getinth(GCtab *t, int32_t key);
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72 LJ_FUNC cTValue *lj_tab_getstr(GCtab *t, const GCstr *key);
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73 LJ_FUNCA cTValue *lj_tab_get(lua_State *L, GCtab *t, cTValue *key);
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74
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75 /* Caveat: all setters require a write barrier for the stored value. */
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76
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77 LJ_FUNCA TValue *lj_tab_newkey(lua_State *L, GCtab *t, cTValue *key);
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78 LJ_FUNCA TValue *lj_tab_setinth(lua_State *L, GCtab *t, int32_t key);
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79 LJ_FUNC TValue *lj_tab_setstr(lua_State *L, GCtab *t, const GCstr *key);
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80 LJ_FUNC TValue *lj_tab_set(lua_State *L, GCtab *t, cTValue *key);
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81
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82 #define inarray(t, key) ((MSize)(key) < (MSize)(t)->asize)
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83 #define arrayslot(t, i) (&tvref((t)->array)[(i)])
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84 #define lj_tab_getint(t, key) \
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85 (inarray((t), (key)) ? arrayslot((t), (key)) : lj_tab_getinth((t), (key)))
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86 #define lj_tab_setint(L, t, key) \
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87 (inarray((t), (key)) ? arrayslot((t), (key)) : lj_tab_setinth(L, (t), (key)))
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88
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89 LJ_FUNC uint32_t LJ_FASTCALL lj_tab_keyindex(GCtab *t, cTValue *key);
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90 LJ_FUNCA int lj_tab_next(GCtab *t, cTValue *key, TValue *o);
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91 LJ_FUNCA MSize LJ_FASTCALL lj_tab_len(GCtab *t);
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92 #if LJ_HASJIT
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93 LJ_FUNC MSize LJ_FASTCALL lj_tab_len_hint(GCtab *t, size_t hint);
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94 #endif
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95
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96 #endif