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/src/middleware/lua/lstate.h

https://bitbucket.org/vivkin/gam3b00bs/
C++ Header | 169 lines | 110 code | 37 blank | 22 comment | 11 complexity | 0b9a678b6645ac6fc80d215017f50b04 MD5 | raw file
  1/*
  2** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
  3** Global State
  4** See Copyright Notice in lua.h
  5*/
  6
  7#ifndef lstate_h
  8#define lstate_h
  9
 10#include "lua.h"
 11
 12#include "lobject.h"
 13#include "ltm.h"
 14#include "lzio.h"
 15
 16
 17
 18struct lua_longjmp;  /* defined in ldo.c */
 19
 20
 21/* table of globals */
 22#define gt(L)	(&L->l_gt)
 23
 24/* registry */
 25#define registry(L)	(&G(L)->l_registry)
 26
 27
 28/* extra stack space to handle TM calls and some other extras */
 29#define EXTRA_STACK   5
 30
 31
 32#define BASIC_CI_SIZE           8
 33
 34#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)
 35
 36
 37
 38typedef struct stringtable {
 39  GCObject **hash;
 40  lu_int32 nuse;  /* number of elements */
 41  int size;
 42} stringtable;
 43
 44
 45/*
 46** informations about a call
 47*/
 48typedef struct CallInfo {
 49  StkId base;  /* base for this function */
 50  StkId func;  /* function index in the stack */
 51  StkId	top;  /* top for this function */
 52  const Instruction *savedpc;
 53  int nresults;  /* expected number of results from this function */
 54  int tailcalls;  /* number of tail calls lost under this entry */
 55} CallInfo;
 56
 57
 58
 59#define curr_func(L)	(clvalue(L->ci->func))
 60#define ci_func(ci)	(clvalue((ci)->func))
 61#define f_isLua(ci)	(!ci_func(ci)->c.isC)
 62#define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))
 63
 64
 65/*
 66** `global state', shared by all threads of this state
 67*/
 68typedef struct global_State {
 69  stringtable strt;  /* hash table for strings */
 70  lua_Alloc frealloc;  /* function to reallocate memory */
 71  void *ud;         /* auxiliary data to `frealloc' */
 72  lu_byte currentwhite;
 73  lu_byte gcstate;  /* state of garbage collector */
 74  int sweepstrgc;  /* position of sweep in `strt' */
 75  GCObject *rootgc;  /* list of all collectable objects */
 76  GCObject **sweepgc;  /* position of sweep in `rootgc' */
 77  GCObject *gray;  /* list of gray objects */
 78  GCObject *grayagain;  /* list of objects to be traversed atomically */
 79  GCObject *weak;  /* list of weak tables (to be cleared) */
 80  GCObject *tmudata;  /* last element of list of userdata to be GC */
 81  Mbuffer buff;  /* temporary buffer for string concatentation */
 82  lu_mem GCthreshold;
 83  lu_mem totalbytes;  /* number of bytes currently allocated */
 84  lu_mem estimate;  /* an estimate of number of bytes actually in use */
 85  lu_mem gcdept;  /* how much GC is `behind schedule' */
 86  int gcpause;  /* size of pause between successive GCs */
 87  int gcstepmul;  /* GC `granularity' */
 88  lua_CFunction panic;  /* to be called in unprotected errors */
 89  TValue l_registry;
 90  struct lua_State *mainthread;
 91  UpVal uvhead;  /* head of double-linked list of all open upvalues */
 92  struct Table *mt[NUM_TAGS];  /* metatables for basic types */
 93  TString *tmname[TM_N];  /* array with tag-method names */
 94} global_State;
 95
 96
 97/*
 98** `per thread' state
 99*/
100struct lua_State {
101  CommonHeader;
102  lu_byte status;
103  StkId top;  /* first free slot in the stack */
104  StkId base;  /* base of current function */
105  global_State *l_G;
106  CallInfo *ci;  /* call info for current function */
107  const Instruction *savedpc;  /* `savedpc' of current function */
108  StkId stack_last;  /* last free slot in the stack */
109  StkId stack;  /* stack base */
110  CallInfo *end_ci;  /* points after end of ci array*/
111  CallInfo *base_ci;  /* array of CallInfo's */
112  int stacksize;
113  int size_ci;  /* size of array `base_ci' */
114  unsigned short nCcalls;  /* number of nested C calls */
115  unsigned short baseCcalls;  /* nested C calls when resuming coroutine */
116  lu_byte hookmask;
117  lu_byte allowhook;
118  int basehookcount;
119  int hookcount;
120  lua_Hook hook;
121  TValue l_gt;  /* table of globals */
122  TValue env;  /* temporary place for environments */
123  GCObject *openupval;  /* list of open upvalues in this stack */
124  GCObject *gclist;
125  struct lua_longjmp *errorJmp;  /* current error recover point */
126  ptrdiff_t errfunc;  /* current error handling function (stack index) */
127};
128
129
130#define G(L)	(L->l_G)
131
132
133/*
134** Union of all collectable objects
135*/
136union GCObject {
137  GCheader gch;
138  union TString ts;
139  union Udata u;
140  union Closure cl;
141  struct Table h;
142  struct Proto p;
143  struct UpVal uv;
144  struct lua_State th;  /* thread */
145};
146
147
148/* macros to convert a GCObject into a specific value */
149#define rawgco2ts(o)	check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
150#define gco2ts(o)	(&rawgco2ts(o)->tsv)
151#define rawgco2u(o)	check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
152#define gco2u(o)	(&rawgco2u(o)->uv)
153#define gco2cl(o)	check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
154#define gco2h(o)	check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
155#define gco2p(o)	check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
156#define gco2uv(o)	check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
157#define ngcotouv(o) \
158	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
159#define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
160
161/* macro to convert any Lua object into a GCObject */
162#define obj2gco(v)	(cast(GCObject *, (v)))
163
164
165LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
166LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
167
168#endif
169