/*
** $Id: ltable.h,v 2.23 2016/12/22 13:08:50 roberto Exp $
** 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)->i_key.nk.next)


/* 'const' to avoid wrong writings that can mess up field 'next' */
#define gkey(n)		cast(const TValue*, (&(n)->i_key.tvk))

/*
** writable version of 'gkey'; allows updates to individual fields,
** but not to the whole (which has incompatible type)
*/
#define wgkey(n)		(&(n)->i_key.nk)

#define invalidateTMcache(t)	((t)->flags = 0)


/* true when 't' is using 'dummynode' as its hash part */
#define isdummy(t)		((t)->lastfree == NULL)


/* allocated size for hash nodes */
#define allocsizenode(t)	(isdummy(t) ? 0 : sizenode(t))


/* returns the key, given the value of a table entry */
#define keyfromval(v) \
  (gkey(cast(Node *, cast(char *, (v)) - offsetof(Node, i_val))))


LUAI_FUNC const TValue* luaH_getint(Table* t, lua_Integer key);
LUAI_FUNC void luaH_setint(lua_State* L, Table* t, lua_Integer key,
                           TValue* value);
LUAI_FUNC const TValue* luaH_getshortstr(Table* t, TString* key);
LUAI_FUNC const TValue* luaH_getstr(Table* t, TString* key);
LUAI_FUNC const TValue* luaH_get(Table* t, const TValue* key);
LUAI_FUNC TValue* luaH_newkey(lua_State* L, Table* t, const TValue* key);
LUAI_FUNC TValue* luaH_set(lua_State* L, Table* t, const TValue* key);
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 int luaH_getn(Table* t);


#if defined(LUA_DEBUG)
LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
LUAI_FUNC int luaH_isdummy (const Table *t);
#endif


#endif