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annotate third_party/luajit/src/lj_tab.h @ 216:e82b80b24012 default tip

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[MrJuneJune] Make webp translate background job.
author June Park <parkjune1995@gmail.com>
date Sat, 28 Feb 2026 21:04:43 -0800
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