mirror of https://github.com/lua/lua
159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
/*
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** $Id: lstate.h,v 1.68 2001/12/18 20:52:30 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 "luadebug.h"
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/*
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** macros for thread syncronization inside Lua core machine:
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** all accesses to the global state and to global objects are syncronized.
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** Because threads can read the stack of other threads
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** (when running garbage collection),
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** a thread must also syncronize any write-access to its own stack.
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** Unsyncronized accesses are allowed only when reading its own stack,
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** or when reading immutable fields from global objects
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** (such as string values and udata values).
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*/
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#ifndef lua_lock
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#define lua_lock(L) ((void) 0)
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#endif
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#ifndef lua_unlock
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#define lua_unlock(L) ((void) 0)
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#endif
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/*
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** macro to allow the inclusion of user information in Lua state
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*/
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#ifndef LUA_USERSTATE
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#define LUA_USERSTATE
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#endif
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#ifndef lua_userstateopen
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#define lua_userstateopen(l)
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#endif
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struct lua_longjmp; /* defined in ldo.c */
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/*
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** reserve init of stack to store some global values
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*/
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/* default meta table (both for tables and udata) */
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#define defaultmeta(L) (L->stack)
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/* table of globals */
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#define gt(L) (L->stack + 1)
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/* registry */
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#define registry(L) (L->stack + 2)
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#define RESERVED_STACK_PREFIX 3
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/* space to handle TM calls */
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#define EXTRA_STACK 4
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#define BASIC_CI_SIZE 6
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#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
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#define DEFAULT_MAXSTACK 12000
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typedef struct stringtable {
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int size;
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ls_nstr nuse; /* number of elements */
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TString **hash;
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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 called function */
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const Instruction *savedpc;
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StkId top; /* top for this function (when it's a Lua function) */
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const Instruction **pc;
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StkId *pb;
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/* extra information for line tracing */
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int lastpc; /* last pc traced */
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int line; /* current line */
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int refi; /* current index in `lineinfo' */
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} CallInfo;
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#define ci_func(ci) (clvalue((ci)->base - 1))
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#define yield_results refi /* reuse this field */
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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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void *Mbuffer; /* global buffer */
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size_t Mbuffsize; /* size of Mbuffer */
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stringtable strt; /* hash table for strings */
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lu_mem GCthreshold;
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lu_mem nblocks; /* number of `bytes' currently allocated */
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Proto *rootproto; /* list of all prototypes */
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Closure *rootcl; /* list of all closures */
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Table *roottable; /* list of all tables */
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UpVal *rootupval; /* list of closed up values */
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Udata *rootudata; /* list of all userdata */
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Udata *tmudata; /* list of userdata to be GC */
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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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LUA_USERSTATE
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StkId top; /* first free slot in the stack */
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CallInfo *ci; /* call info for 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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int stacksize;
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int maxstacksize;
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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 size_ci; /* size of array `base_ci' */
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global_State *_G;
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lua_Hook callhook;
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lua_Hook linehook;
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int allowhooks;
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struct lua_longjmp *errorJmp; /* current error recover point */
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UpVal *openupval; /* list of open upvalues in this stack */
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lua_State *next; /* circular double linked list of states */
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lua_State *previous;
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};
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#define G(L) (L->_G)
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void luaE_closethread (lua_State *OL, lua_State *L);
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#endif
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