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/*
** $Id: lstate.h,v 1.1 2003/10/10 16:15:45 graydon 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"
/*
** macros for thread synchronization inside Lua core machine:
** all accesses to the global state and to global objects are synchronized.
** Because threads can read the stack of other threads
** (when running garbage collection),
** a thread must also synchronize any write-access to its own stack.
** Unsynchronized accesses are allowed only when reading its own stack,
** or when reading immutable fields from global objects
** (such as string values and udata values).
*/
#ifndef lua_lock
#define lua_lock(L) ((void) 0)
#endif
#ifndef lua_unlock
#define lua_unlock(L) ((void) 0)
#endif
#ifndef lua_userstateopen
#define lua_userstateopen(l)
#endif
struct lua_longjmp; /* defined in ldo.c */
/* default meta table (both for tables and udata) */
#define defaultmeta(L) (&G(L)->_defaultmeta)
/* table of globals */
#define gt(L) (&L->_gt)
/* registry */
#define registry(L) (&G(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;
ls_nstr nuse; /* number of elements */
int size;
} stringtable;
/*
** informations about a call
*/
typedef struct CallInfo {
StkId base; /* base for called function */
StkId top; /* top for this function */
int state; /* bit fields; see below */
union {
struct { /* for Lua functions */
const Instruction *savedpc;
const Instruction **pc; /* points to `pc' variable in `luaV_execute' */
int tailcalls; /* number of tail calls lost under this entry */
} l;
struct { /* for C functions */
int dummy; /* just to avoid an empty struct */
} c;
} u;
} CallInfo;
/*
** bit fields for `CallInfo.state'
*/
#define CI_C (1<<0) /* 1 if function is a C function */
/* 1 if (Lua) function has an active `luaV_execute' running it */
#define CI_HASFRAME (1<<1)
/* 1 if Lua function is calling another Lua function (and therefore its
`pc' is being used by the other, and therefore CI_SAVEDPC is 1 too) */
#define CI_CALLING (1<<2)
#define CI_SAVEDPC (1<<3) /* 1 if `savedpc' is updated */
#define CI_YIELD (1<<4) /* 1 if thread is suspended */
#define ci_func(ci) (clvalue((ci)->base - 1))
/*
** `global state', shared by all threads of this state
*/
typedef struct global_State {
stringtable strt; /* hash table for strings */
GCObject *rootgc; /* list of (almost) all collectable objects */
GCObject *rootudata; /* (separated) list of all userdata */
GCObject *tmudata; /* list of userdata to be GC */
Mbuffer buff; /* temporary buffer for string concatentation */
lu_mem GCthreshold;
lu_mem nblocks; /* number of `bytes' currently allocated */
lua_CFunction panic; /* to be called in unprotected errors */
TObject _registry;
TObject _defaultmeta;
struct lua_State *mainthread;
Node dummynode[1]; /* common node array for all empty tables */
TString *tmname[TM_N]; /* array with tag-method names */
} global_State;
/*
** `per thread' state
*/
struct lua_State {
CommonHeader;
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 */
StkId stack_last; /* last free slot in the stack */
StkId stack; /* stack base */
int stacksize;
CallInfo *end_ci; /* points after end of ci array*/
CallInfo *base_ci; /* array of CallInfo's */
unsigned short size_ci; /* size of array `base_ci' */
unsigned short nCcalls; /* number of nested C calls */
lu_byte hookmask;
lu_byte allowhook;
lu_byte hookinit;
int basehookcount;
int hookcount;
lua_Hook hook;
TObject _gt; /* table of globals */
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 gcotots(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
#define gcotou(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
#define gcotocl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
#define gcotoh(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
#define gcotop(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
#define gcotouv(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 gcototh(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
/* macro to convert any value into a GCObject */
#define valtogco(v) (cast(GCObject *, (v)))
lua_State *luaE_newthread (lua_State *L);
void luaE_freethread (lua_State *L, lua_State *L1);
#endif
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