221 lines
7.0 KiB
C
221 lines
7.0 KiB
C
/*
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** $Id: lstate.h,v 2.74 2011/09/30 12:45:07 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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/*
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** Some notes about garbage-collected objects: All objects in Lua must
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** be kept somehow accessible until being freed.
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**
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** Lua keeps most objects linked in list g->allgc. The link uses field
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** 'next' of the CommonHeader.
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**
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** Strings are kept in several lists headed by the array g->strt.hash.
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**
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** Open upvalues are not subject to independent garbage collection. They
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** are collected together with their respective threads. Lua keeps a
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** double-linked list with all open upvalues (g->uvhead) so that it can
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** mark objects referred by them. (They are always gray, so they must
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** be remarked in the atomic step. Usually their contents would be marked
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** when traversing the respective threads, but the thread may already be
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** dead, while the upvalue is still accessible through closures.)
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**
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** Objects with finalizers are kept in the list g->finobj.
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**
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** The list g->tobefnz links all objects being finalized.
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*/
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struct lua_longjmp; /* defined in ldo.c */
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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_STACK_SIZE (2*LUA_MINSTACK)
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/* kinds of Garbage Collection */
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#define KGC_NORMAL 0
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#define KGC_EMERGENCY 1 /* gc was forced by an allocation failure */
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#define KGC_GEN 2 /* generational collection */
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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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** information about a call
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*/
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typedef struct CallInfo {
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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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struct CallInfo *previous, *next; /* dynamic call link */
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short nresults; /* expected number of results from this function */
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lu_byte callstatus;
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union {
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struct { /* only for Lua functions */
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StkId base; /* base for this function */
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const Instruction *savedpc;
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} l;
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struct { /* only for C functions */
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int ctx; /* context info. in case of yields */
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lua_CFunction k; /* continuation in case of yields */
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ptrdiff_t old_errfunc;
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ptrdiff_t extra;
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lu_byte old_allowhook;
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lu_byte status;
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} c;
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} u;
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} CallInfo;
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/*
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** Bits in CallInfo status
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*/
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#define CIST_LUA (1<<0) /* call is running a Lua function */
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#define CIST_HOOKED (1<<1) /* call is running a debug hook */
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#define CIST_REENTRY (1<<2) /* call is running on same invocation of
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luaV_execute of previous call */
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#define CIST_YIELDED (1<<3) /* call reentered after suspension */
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#define CIST_YPCALL (1<<4) /* call is a yieldable protected call */
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#define CIST_STAT (1<<5) /* call has an error status (pcall) */
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#define CIST_TAIL (1<<6) /* call was tail called */
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#define isLua(ci) ((ci)->callstatus & CIST_LUA)
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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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lua_Alloc frealloc; /* function to reallocate memory */
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void *ud; /* auxiliary data to `frealloc' */
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lu_mem totalbytes; /* number of bytes currently allocated - GCdebt */
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l_mem GCdebt; /* bytes allocated not yet compensated by the collector */
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lu_mem lastmajormem; /* memory in use after last major collection */
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stringtable strt; /* hash table for strings */
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TValue l_registry;
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lu_byte currentwhite;
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lu_byte gcstate; /* state of garbage collector */
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lu_byte gckind; /* kind of GC running */
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lu_byte gcrunning; /* true if GC is running */
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int sweepstrgc; /* position of sweep in `strt' */
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GCObject *allgc; /* list of all collectable objects */
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GCObject *finobj; /* list of collectable objects with finalizers */
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GCObject **sweepgc; /* current position of sweep */
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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 tables with weak values */
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GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
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GCObject *allweak; /* list of all-weak tables */
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GCObject *tobefnz; /* list of userdata to be GC */
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UpVal uvhead; /* head of double-linked list of all open upvalues */
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Mbuffer buff; /* temporary buffer for string concatenation */
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int gcpause; /* size of pause between successive GCs */
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int gcmajorinc; /* how much to wait for a major GC (only in gen. mode) */
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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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struct lua_State *mainthread;
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const lua_Number *version; /* pointer to version number */
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TString *memerrmsg; /* memory-error message */
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TString *tmname[TM_N]; /* array with tag-method names */
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struct Table *mt[LUA_NUMTAGS]; /* metatables for basic types */
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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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global_State *l_G;
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CallInfo *ci; /* call info for current function */
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const Instruction *oldpc; /* last pc traced */
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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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unsigned short nny; /* number of non-yieldable calls in stack */
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unsigned short nCcalls; /* number of nested C calls */
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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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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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CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
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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; /* common header */
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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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#define gch(o) (&(o)->gch)
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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 gco2t(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 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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/* actual number of total bytes allocated */
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#define gettotalbytes(g) ((g)->totalbytes + (g)->GCdebt)
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LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);
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LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
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LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);
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LUAI_FUNC void luaE_freeCI (lua_State *L);
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#endif
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