misc/liblua/lstate.h
author Periklis Ntanasis <pntanasis@gmail.com>
Tue, 24 Dec 2013 01:10:38 +0200
changeset 9831 afa4e3e04cc5
parent 2812 0a24853de796
child 10017 de822cd3df3a
permissions -rw-r--r--
typos correction
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/*
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** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
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** Global State
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** See Copyright Notice in lua.h
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*/
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#ifndef lstate_h
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#define lstate_h
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#include "lua.h"
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#include "lobject.h"
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#include "ltm.h"
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#include "lzio.h"
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struct lua_longjmp;  /* defined in ldo.c */
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/* table of globals */
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#define gt(L)	(&L->l_gt)
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/* registry */
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#define registry(L)	(&G(L)->l_registry)
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/* extra stack space to handle TM calls and some other extras */
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#define EXTRA_STACK   5
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#define BASIC_CI_SIZE           8
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#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)
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typedef struct stringtable {
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  GCObject **hash;
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  lu_int32 nuse;  /* number of elements */
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  int size;
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} stringtable;
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/*
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** informations about a call
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*/
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typedef struct CallInfo {
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  StkId base;  /* base for this function */
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  StkId func;  /* function index in the stack */
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  StkId	top;  /* top for this function */
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  const Instruction *savedpc;
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  int nresults;  /* expected number of results from this function */
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  int tailcalls;  /* number of tail calls lost under this entry */
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} CallInfo;
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#define curr_func(L)	(clvalue(L->ci->func))
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#define ci_func(ci)	(clvalue((ci)->func))
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#define f_isLua(ci)	(!ci_func(ci)->c.isC)
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#define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))
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/*
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** `global state', shared by all threads of this state
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*/
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typedef struct global_State {
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  stringtable strt;  /* hash table for strings */
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  lua_Alloc frealloc;  /* function to reallocate memory */
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  void *ud;         /* auxiliary data to `frealloc' */
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  lu_byte currentwhite;
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  lu_byte gcstate;  /* state of garbage collector */
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  int sweepstrgc;  /* position of sweep in `strt' */
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  GCObject *rootgc;  /* list of all collectable objects */
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  GCObject **sweepgc;  /* position of sweep in `rootgc' */
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  GCObject *gray;  /* list of gray objects */
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  GCObject *grayagain;  /* list of objects to be traversed atomically */
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  GCObject *weak;  /* list of weak tables (to be cleared) */
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  GCObject *tmudata;  /* last element of list of userdata to be GC */
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  Mbuffer buff;  /* temporary buffer for string concatentation */
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  lu_mem GCthreshold;
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  lu_mem totalbytes;  /* number of bytes currently allocated */
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  lu_mem estimate;  /* an estimate of number of bytes actually in use */
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  lu_mem gcdept;  /* how much GC is `behind schedule' */
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  int gcpause;  /* size of pause between successive GCs */
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  int gcstepmul;  /* GC `granularity' */
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  lua_CFunction panic;  /* to be called in unprotected errors */
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  TValue l_registry;
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  struct lua_State *mainthread;
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  UpVal uvhead;  /* head of double-linked list of all open upvalues */
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  struct Table *mt[NUM_TAGS];  /* metatables for basic types */
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  TString *tmname[TM_N];  /* array with tag-method names */
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} global_State;
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/*
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** `per thread' state
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*/
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struct lua_State {
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  CommonHeader;
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  lu_byte status;
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  StkId top;  /* first free slot in the stack */
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  StkId base;  /* base of current function */
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  global_State *l_G;
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  CallInfo *ci;  /* call info for current function */
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  const Instruction *savedpc;  /* `savedpc' of current function */
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  StkId stack_last;  /* last free slot in the stack */
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  StkId stack;  /* stack base */
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  CallInfo *end_ci;  /* points after end of ci array*/
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  CallInfo *base_ci;  /* array of CallInfo's */
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  int stacksize;
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  int size_ci;  /* size of array `base_ci' */
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  unsigned short nCcalls;  /* number of nested C calls */
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  unsigned short baseCcalls;  /* nested C calls when resuming coroutine */
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  lu_byte hookmask;
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  lu_byte allowhook;
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  int basehookcount;
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  int hookcount;
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  lua_Hook hook;
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  TValue l_gt;  /* table of globals */
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  TValue env;  /* temporary place for environments */
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  GCObject *openupval;  /* list of open upvalues in this stack */
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  GCObject *gclist;
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  struct lua_longjmp *errorJmp;  /* current error recover point */
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  ptrdiff_t errfunc;  /* current error handling function (stack index) */
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};
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#define G(L)	(L->l_G)
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/*
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** Union of all collectable objects
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*/
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union GCObject {
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  GCheader gch;
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  union TString ts;
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  union Udata u;
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  union Closure cl;
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  struct Table h;
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  struct Proto p;
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  struct UpVal uv;
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  struct lua_State th;  /* thread */
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};
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/* macros to convert a GCObject into a specific value */
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#define rawgco2ts(o)	check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
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#define gco2ts(o)	(&rawgco2ts(o)->tsv)
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#define rawgco2u(o)	check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
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#define gco2u(o)	(&rawgco2u(o)->uv)
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#define gco2cl(o)	check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
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#define gco2h(o)	check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
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#define gco2p(o)	check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
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#define gco2uv(o)	check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
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#define ngcotouv(o) \
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	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
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#define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
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/* macro to convert any Lua object into a GCObject */
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#define obj2gco(v)	(cast(GCObject *, (v)))
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LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
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LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
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#endif
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