mirror of https://github.com/lua/lua.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
149 lines
4.7 KiB
149 lines
4.7 KiB
/*
|
|
** $Id: ltable.h $
|
|
** Lua tables (hash)
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#ifndef ltable_h
|
|
#define ltable_h
|
|
|
|
#include "lobject.h"
|
|
|
|
|
|
#define gnode(t,i) (&(t)->node[i])
|
|
#define gval(n) (&(n)->i_val)
|
|
#define gnext(n) ((n)->u.next)
|
|
|
|
|
|
/*
|
|
** Clear all bits of fast-access metamethods, which means that the table
|
|
** may have any of these metamethods. (First access that fails after the
|
|
** clearing will set the bit again.)
|
|
*/
|
|
#define invalidateTMcache(t) ((t)->flags &= ~maskflags)
|
|
|
|
|
|
/*
|
|
** Bit BITDUMMY set in 'flags' means the table is using the dummy node
|
|
** for its hash part.
|
|
*/
|
|
|
|
#define BITDUMMY (1 << 6)
|
|
#define NOTBITDUMMY cast_byte(~BITDUMMY)
|
|
#define isdummy(t) ((t)->flags & BITDUMMY)
|
|
|
|
#define setnodummy(t) ((t)->flags &= NOTBITDUMMY)
|
|
#define setdummy(t) ((t)->flags |= BITDUMMY)
|
|
|
|
|
|
|
|
/* allocated size for hash nodes */
|
|
#define allocsizenode(t) (isdummy(t) ? 0 : sizenode(t))
|
|
|
|
|
|
/* returns the Node, given the value of a table entry */
|
|
#define nodefromval(v) cast(Node *, (v))
|
|
|
|
|
|
/* results from get/pset */
|
|
#define HOK 0
|
|
#define HNOTFOUND 1
|
|
#define HNOTATABLE 2
|
|
#define HFIRSTNODE 3
|
|
|
|
/*
|
|
** 'luaH_get*' operations set 'res' and return HOK, unless the value is
|
|
** absent. In that case, they set nothing and return HNOTFOUND.
|
|
** The 'luaH_pset*' (pre-set) operations set the given value and return
|
|
** HOK, unless the original value is absent. In that case, if the key
|
|
** is really absent, they return HNOTFOUND. Otherwise, if there is a
|
|
** slot with that key but with no value, 'luaH_pset*' return an encoding
|
|
** of where the key is (usually called 'hres'). (pset cannot set that
|
|
** value because there might be a metamethod.) If the slot is in the
|
|
** hash part, the encoding is (HFIRSTNODE + hash index); if the slot is
|
|
** in the array part, the encoding is (~array index), a negative value.
|
|
** The value HNOTATABLE is used by the fast macros to signal that the
|
|
** value being indexed is not a table.
|
|
*/
|
|
|
|
|
|
/*
|
|
** The array part of a table is represented by an array of cells.
|
|
** Each cell is composed of NM tags followed by NM values, so that
|
|
** no space is wasted in padding.
|
|
*/
|
|
#define NM cast_uint(sizeof(Value))
|
|
|
|
struct ArrayCell {
|
|
lu_byte tag[NM];
|
|
Value value[NM];
|
|
};
|
|
|
|
|
|
/* Computes the address of the tag for the abstract index 'k' */
|
|
#define getArrTag(t,k) (&(t)->array[(k)/NM].tag[(k)%NM])
|
|
|
|
/* Computes the address of the value for the abstract index 'k' */
|
|
#define getArrVal(t,k) (&(t)->array[(k)/NM].value[(k)%NM])
|
|
|
|
|
|
/*
|
|
** Move TValues to/from arrays, using Lua indices
|
|
*/
|
|
#define arr2obj(h,k,val) \
|
|
((val)->tt_ = *getArrTag(h,(k)-1u), (val)->value_ = *getArrVal(h,(k)-1u))
|
|
|
|
#define obj2arr(h,k,val) \
|
|
(*getArrTag(h,(k)-1u) = (val)->tt_, *getArrVal(h,(k)-1u) = (val)->value_)
|
|
|
|
|
|
/*
|
|
** Often, we need to check the tag of a value before moving it. These
|
|
** macros also move TValues to/from arrays, but receive the precomputed
|
|
** tag value or address as an extra argument.
|
|
*/
|
|
#define farr2val(h,k,tag,res) \
|
|
((res)->tt_ = tag, (res)->value_ = *getArrVal(h,(k)-1u))
|
|
|
|
#define fval2arr(h,k,tag,val) \
|
|
(*tag = (val)->tt_, *getArrVal(h,(k)-1u) = (val)->value_)
|
|
|
|
|
|
LUAI_FUNC int luaH_get (Table *t, const TValue *key, TValue *res);
|
|
LUAI_FUNC int luaH_getshortstr (Table *t, TString *key, TValue *res);
|
|
LUAI_FUNC int luaH_getstr (Table *t, TString *key, TValue *res);
|
|
LUAI_FUNC int luaH_getint (Table *t, lua_Integer key, TValue *res);
|
|
|
|
/* Special get for metamethods */
|
|
LUAI_FUNC const TValue *luaH_Hgetshortstr (Table *t, TString *key);
|
|
|
|
LUAI_FUNC TString *luaH_getstrkey (Table *t, TString *key);
|
|
|
|
LUAI_FUNC int luaH_psetint (Table *t, lua_Integer key, TValue *val);
|
|
LUAI_FUNC int luaH_psetshortstr (Table *t, TString *key, TValue *val);
|
|
LUAI_FUNC int luaH_psetstr (Table *t, TString *key, TValue *val);
|
|
LUAI_FUNC int luaH_pset (Table *t, const TValue *key, TValue *val);
|
|
|
|
LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key,
|
|
TValue *value);
|
|
LUAI_FUNC void luaH_set (lua_State *L, Table *t, const TValue *key,
|
|
TValue *value);
|
|
|
|
LUAI_FUNC void luaH_finishset (lua_State *L, Table *t, const TValue *key,
|
|
TValue *value, int hres);
|
|
LUAI_FUNC Table *luaH_new (lua_State *L);
|
|
LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize,
|
|
unsigned int nhsize);
|
|
LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize);
|
|
LUAI_FUNC void luaH_free (lua_State *L, Table *t);
|
|
LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key);
|
|
LUAI_FUNC lua_Unsigned luaH_getn (Table *t);
|
|
LUAI_FUNC unsigned int luaH_realasize (const Table *t);
|
|
|
|
|
|
#if defined(LUA_DEBUG)
|
|
LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
|
|
#endif
|
|
|
|
|
|
#endif
|
|
|