70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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** Table handling.
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** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
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*/
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#ifndef _LJ_TAB_H
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#define _LJ_TAB_H
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#include "lj_obj.h"
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/* Hash constants. Tuned using a brute force search. */
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#define HASH_BIAS (-0x04c11db7)
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#define HASH_ROT1 14
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#define HASH_ROT2 5
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#define HASH_ROT3 13
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/* Scramble the bits of numbers and pointers. */
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static LJ_AINLINE uint32_t hashrot(uint32_t lo, uint32_t hi)
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{
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#if LJ_TARGET_X86ORX64
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/* Prefer variant that compiles well for a 2-operand CPU. */
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lo ^= hi; hi = lj_rol(hi, HASH_ROT1);
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lo -= hi; hi = lj_rol(hi, HASH_ROT2);
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hi ^= lo; hi -= lj_rol(lo, HASH_ROT3);
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#else
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lo ^= hi;
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lo = lo - lj_rol(hi, HASH_ROT1);
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hi = lo ^ lj_rol(hi, HASH_ROT1 + HASH_ROT2);
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hi = hi - lj_rol(lo, HASH_ROT3);
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#endif
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return hi;
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}
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#define hsize2hbits(s) ((s) ? ((s)==1 ? 1 : 1+lj_fls((uint32_t)((s)-1))) : 0)
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LJ_FUNCA GCtab *lj_tab_new(lua_State *L, uint32_t asize, uint32_t hbits);
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#if LJ_HASJIT
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LJ_FUNC GCtab * LJ_FASTCALL lj_tab_new1(lua_State *L, uint32_t ahsize);
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#endif
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LJ_FUNCA GCtab * LJ_FASTCALL lj_tab_dup(lua_State *L, const GCtab *kt);
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LJ_FUNC void LJ_FASTCALL lj_tab_free(global_State *g, GCtab *t);
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#if LJ_HASFFI
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LJ_FUNC void lj_tab_rehash(lua_State *L, GCtab *t);
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#endif
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LJ_FUNCA void lj_tab_reasize(lua_State *L, GCtab *t, uint32_t nasize);
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/* Caveat: all getters except lj_tab_get() can return NULL! */
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LJ_FUNCA cTValue * LJ_FASTCALL lj_tab_getinth(GCtab *t, int32_t key);
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LJ_FUNC cTValue *lj_tab_getstr(GCtab *t, GCstr *key);
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LJ_FUNCA cTValue *lj_tab_get(lua_State *L, GCtab *t, cTValue *key);
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/* Caveat: all setters require a write barrier for the stored value. */
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LJ_FUNCA TValue *lj_tab_newkey(lua_State *L, GCtab *t, cTValue *key);
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LJ_FUNC TValue *lj_tab_setinth(lua_State *L, GCtab *t, int32_t key);
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LJ_FUNC TValue *lj_tab_setstr(lua_State *L, GCtab *t, GCstr *key);
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LJ_FUNC TValue *lj_tab_set(lua_State *L, GCtab *t, cTValue *key);
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#define inarray(t, key) ((MSize)(key) < (MSize)(t)->asize)
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#define arrayslot(t, i) (&tvref((t)->array)[(i)])
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#define lj_tab_getint(t, key) \
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(inarray((t), (key)) ? arrayslot((t), (key)) : lj_tab_getinth((t), (key)))
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#define lj_tab_setint(L, t, key) \
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(inarray((t), (key)) ? arrayslot((t), (key)) : lj_tab_setinth(L, (t), (key)))
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LJ_FUNCA int lj_tab_next(lua_State *L, GCtab *t, TValue *key);
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LJ_FUNCA MSize LJ_FASTCALL lj_tab_len(GCtab *t);
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#endif
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