mirror of
https://github.com/lua/lua
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52b899d60d
With the tags comming first in a cell, we can define the whole cell as a C type and let C do part of the address computations.
150 lines
4.7 KiB
C
150 lines
4.7 KiB
C
/*
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** $Id: ltable.h $
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** Lua tables (hash)
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** See Copyright Notice in lua.h
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*/
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#ifndef ltable_h
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#define ltable_h
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#include "lobject.h"
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#define gnode(t,i) (&(t)->node[i])
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#define gval(n) (&(n)->i_val)
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#define gnext(n) ((n)->u.next)
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/*
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** Clear all bits of fast-access metamethods, which means that the table
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** may have any of these metamethods. (First access that fails after the
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** clearing will set the bit again.)
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*/
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#define invalidateTMcache(t) ((t)->flags &= ~maskflags)
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/*
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** Bit BITDUMMY set in 'flags' means the table is using the dummy node
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** for its hash part.
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*/
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#define BITDUMMY (1 << 6)
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#define NOTBITDUMMY cast_byte(~BITDUMMY)
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#define isdummy(t) ((t)->flags & BITDUMMY)
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#define setnodummy(t) ((t)->flags &= NOTBITDUMMY)
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#define setdummy(t) ((t)->flags |= BITDUMMY)
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/* allocated size for hash nodes */
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#define allocsizenode(t) (isdummy(t) ? 0 : sizenode(t))
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/* returns the Node, given the value of a table entry */
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#define nodefromval(v) cast(Node *, (v))
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/* results from get/pset */
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#define HOK 0
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#define HNOTFOUND 1
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#define HNOTATABLE 2
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#define HFIRSTNODE 3
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/*
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** 'luaH_get*' operations set 'res' and return HOK, unless the value is
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** absent. In that case, they set nothing and return HNOTFOUND.
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** The 'luaH_pset*' (pre-set) operations set the given value and return
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** HOK, unless the original value is absent. In that case, if the key
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** is really absent, they return HNOTFOUND. Otherwise, if there is a
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** slot with that key but with no value, 'luaH_pset*' return an encoding
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** of where the key is (usually called 'hres'). (pset cannot set that
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** value because there might be a metamethod.) If the slot is in the
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** hash part, the encoding is (HFIRSTNODE + hash index); if the slot is
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** in the array part, the encoding is (~array index), a negative value.
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** The value HNOTATABLE is used by the fast macros to signal that the
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** value being indexed is not a table.
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*/
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/*
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** The array part of a table is represented by an array of cells.
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** Each cell is composed of NM tags followed by NM values, so that
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** no space is wasted in padding.
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*/
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#define NM cast_uint(sizeof(Value))
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struct ArrayCell {
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lu_byte tag[NM];
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Value value[NM];
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};
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/* Computes the address of the tag for the abstract index 'k' */
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#define getArrTag(t,k) (&(t)->array[(k)/NM].tag[(k)%NM])
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/* Computes the address of the value for the abstract index 'k' */
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#define getArrVal(t,k) (&(t)->array[(k)/NM].value[(k)%NM])
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/*
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** Move TValues to/from arrays, using Lua indices
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*/
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#define arr2obj(h,k,val) \
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((val)->tt_ = *getArrTag(h,(k)-1u), (val)->value_ = *getArrVal(h,(k)-1u))
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#define obj2arr(h,k,val) \
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(*getArrTag(h,(k)-1u) = (val)->tt_, *getArrVal(h,(k)-1u) = (val)->value_)
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/*
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** Often, we need to check the tag of a value before moving it. These
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** macros also move TValues to/from arrays, but receive the precomputed
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** tag value or address as an extra argument.
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*/
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#define farr2val(h,k,tag,res) \
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((res)->tt_ = tag, (res)->value_ = *getArrVal(h,(k)-1u))
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#define fval2arr(h,k,tag,val) \
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(*tag = (val)->tt_, *getArrVal(h,(k)-1u) = (val)->value_)
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LUAI_FUNC int luaH_get (Table *t, const TValue *key, TValue *res);
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LUAI_FUNC int luaH_getshortstr (Table *t, TString *key, TValue *res);
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LUAI_FUNC int luaH_getstr (Table *t, TString *key, TValue *res);
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LUAI_FUNC int luaH_getint (Table *t, lua_Integer key, TValue *res);
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/* Special get for metamethods */
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LUAI_FUNC const TValue *luaH_Hgetshortstr (Table *t, TString *key);
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LUAI_FUNC TString *luaH_getstrkey (Table *t, TString *key);
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LUAI_FUNC int luaH_psetint (Table *t, lua_Integer key, TValue *val);
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LUAI_FUNC int luaH_psetshortstr (Table *t, TString *key, TValue *val);
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LUAI_FUNC int luaH_psetstr (Table *t, TString *key, TValue *val);
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LUAI_FUNC int luaH_pset (Table *t, const TValue *key, TValue *val);
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LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key,
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TValue *value);
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LUAI_FUNC void luaH_set (lua_State *L, Table *t, const TValue *key,
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TValue *value);
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LUAI_FUNC void luaH_finishset (lua_State *L, Table *t, const TValue *key,
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TValue *value, int hres);
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LUAI_FUNC Table *luaH_new (lua_State *L);
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LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize,
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unsigned int nhsize);
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LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize);
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LUAI_FUNC void luaH_free (lua_State *L, Table *t);
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LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key);
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LUAI_FUNC lua_Unsigned luaH_getn (Table *t);
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LUAI_FUNC unsigned int luaH_realasize (const Table *t);
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#if defined(LUA_DEBUG)
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LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
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#endif
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#endif
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