[redis.git] / deps / lua / src / lstate.h

/*
** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
** Global State
** See Copyright Notice in lua.h
*/

#ifndef lstate_h
#define lstate_h

#include "lua.h"

#include "lobject.h"
#include "ltm.h"
#include "lzio.h"


struct lua_longjmp;  /* defined in ldo.c */


/* table of globals */
#define gt(L)	(&L->l_gt)

/* registry */
#define registry(L)	(&G(L)->l_registry)


/* extra stack space to handle TM calls and some other extras */
#define EXTRA_STACK   5


#define BASIC_CI_SIZE           8

#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)


typedef struct stringtable {
  GCObject **hash;
  lu_int32 nuse;  /* number of elements */
  int size;
} stringtable;


/*
** informations about a call
*/
typedef struct CallInfo {
  StkId base;  /* base for this function */
  StkId func;  /* function index in the stack */
  StkId	top;  /* top for this function */
  const Instruction *savedpc;
  int nresults;  /* expected number of results from this function */
  int tailcalls;  /* number of tail calls lost under this entry */
} CallInfo;


#define curr_func(L)	(clvalue(L->ci->func))
#define ci_func(ci)	(clvalue((ci)->func))
#define f_isLua(ci)	(!ci_func(ci)->c.isC)
#define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))


/*
** `global state', shared by all threads of this state
*/
typedef struct global_State {
  stringtable strt;  /* hash table for strings */
  lua_Alloc frealloc;  /* function to reallocate memory */
  void *ud;         /* auxiliary data to `frealloc' */
  lu_byte currentwhite;
  lu_byte gcstate;  /* state of garbage collector */
  int sweepstrgc;  /* position of sweep in `strt' */
  GCObject *rootgc;  /* list of all collectable objects */
  GCObject **sweepgc;  /* position of sweep in `rootgc' */
  GCObject *gray;  /* list of gray objects */
  GCObject *grayagain;  /* list of objects to be traversed atomically */
  GCObject *weak;  /* list of weak tables (to be cleared) */
  GCObject *tmudata;  /* last element of list of userdata to be GC */
  Mbuffer buff;  /* temporary buffer for string concatentation */
  lu_mem GCthreshold;
  lu_mem totalbytes;  /* number of bytes currently allocated */
  lu_mem estimate;  /* an estimate of number of bytes actually in use */
  lu_mem gcdept;  /* how much GC is `behind schedule' */
  int gcpause;  /* size of pause between successive GCs */
  int gcstepmul;  /* GC `granularity' */
  lua_CFunction panic;  /* to be called in unprotected errors */
  TValue l_registry;
  struct lua_State *mainthread;
  UpVal uvhead;  /* head of double-linked list of all open upvalues */
  struct Table *mt[NUM_TAGS];  /* metatables for basic types */
  TString *tmname[TM_N];  /* array with tag-method names */
} global_State;


/*
** `per thread' state
*/
struct lua_State {
  CommonHeader;
  lu_byte status;
  StkId top;  /* first free slot in the stack */
  StkId base;  /* base of current function */
  global_State *l_G;
  CallInfo *ci;  /* call info for current function */
  const Instruction *savedpc;  /* `savedpc' of current function */
  StkId stack_last;  /* last free slot in the stack */
  StkId stack;  /* stack base */
  CallInfo *end_ci;  /* points after end of ci array*/
  CallInfo *base_ci;  /* array of CallInfo's */
  int stacksize;
  int size_ci;  /* size of array `base_ci' */
  unsigned short nCcalls;  /* number of nested C calls */
  unsigned short baseCcalls;  /* nested C calls when resuming coroutine */
  lu_byte hookmask;
  lu_byte allowhook;
  int basehookcount;
  int hookcount;
  lua_Hook hook;
  TValue l_gt;  /* table of globals */
  TValue env;  /* temporary place for environments */
  GCObject *openupval;  /* list of open upvalues in this stack */
  GCObject *gclist;
  struct lua_longjmp *errorJmp;  /* current error recover point */
  ptrdiff_t errfunc;  /* current error handling function (stack index) */
};


#define G(L)	(L->l_G)


/*
** Union of all collectable objects
*/
union GCObject {
  GCheader gch;
  union TString ts;
  union Udata u;
  union Closure cl;
  struct Table h;
  struct Proto p;
  struct UpVal uv;
  struct lua_State th;  /* thread */
};


/* macros to convert a GCObject into a specific value */
#define rawgco2ts(o)	check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
#define gco2ts(o)	(&rawgco2ts(o)->tsv)
#define rawgco2u(o)	check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
#define gco2u(o)	(&rawgco2u(o)->uv)
#define gco2cl(o)	check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
#define gco2h(o)	check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
#define gco2p(o)	check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
#define gco2uv(o)	check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define ngcotouv(o) \
	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))

/* macro to convert any Lua object into a GCObject */
#define obj2gco(v)	(cast(GCObject *, (v)))


LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);

#endif
Commit	Line	Data
21d3294c	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
	18	struct 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
	38	typedef 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	*/
	48	typedef 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	*/
68	typedef 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	*/
100	struct 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	*/
136	union 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
165	LUAI_FUNC lua_State luaE_newthread (lua_State L);
166	LUAI_FUNC void luaE_freethread (lua_State L, lua_State L1);
167
168	#endif
169