0,0 → 1,220 |
/* |
** $Id: lstate.h,v 2.74 2011/09/30 12:45:07 roberto Exp $ |
** Global State |
** See Copyright Notice in lua.h |
*/ |
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#ifndef lstate_h |
#define lstate_h |
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#include "lua.h" |
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#include "lobject.h" |
#include "ltm.h" |
#include "lzio.h" |
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/* |
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** Some notes about garbage-collected objects: All objects in Lua must |
** be kept somehow accessible until being freed. |
** |
** Lua keeps most objects linked in list g->allgc. The link uses field |
** 'next' of the CommonHeader. |
** |
** Strings are kept in several lists headed by the array g->strt.hash. |
** |
** Open upvalues are not subject to independent garbage collection. They |
** are collected together with their respective threads. Lua keeps a |
** double-linked list with all open upvalues (g->uvhead) so that it can |
** mark objects referred by them. (They are always gray, so they must |
** be remarked in the atomic step. Usually their contents would be marked |
** when traversing the respective threads, but the thread may already be |
** dead, while the upvalue is still accessible through closures.) |
** |
** Objects with finalizers are kept in the list g->finobj. |
** |
** 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 */ |
#define EXTRA_STACK 5 |
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#define BASIC_STACK_SIZE (2*LUA_MINSTACK) |
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/* kinds of Garbage Collection */ |
#define KGC_NORMAL 0 |
#define KGC_EMERGENCY 1 /* gc was forced by an allocation failure */ |
#define KGC_GEN 2 /* generational collection */ |
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typedef struct stringtable { |
GCObject **hash; |
lu_int32 nuse; /* number of elements */ |
int size; |
} stringtable; |
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/* |
** information about a call |
*/ |
typedef struct CallInfo { |
StkId func; /* function index in the stack */ |
StkId top; /* top for this function */ |
struct CallInfo *previous, *next; /* dynamic call link */ |
short nresults; /* expected number of results from this function */ |
lu_byte callstatus; |
union { |
struct { /* only for Lua functions */ |
StkId base; /* base for this function */ |
const Instruction *savedpc; |
} l; |
struct { /* only for C functions */ |
int ctx; /* context info. in case of yields */ |
lua_CFunction k; /* continuation in case of yields */ |
ptrdiff_t old_errfunc; |
ptrdiff_t extra; |
lu_byte old_allowhook; |
lu_byte status; |
} c; |
} u; |
} CallInfo; |
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/* |
** Bits in CallInfo status |
*/ |
#define CIST_LUA (1<<0) /* call is running a Lua function */ |
#define CIST_HOOKED (1<<1) /* call is running a debug hook */ |
#define CIST_REENTRY (1<<2) /* call is running on same invocation of |
luaV_execute of previous call */ |
#define CIST_YIELDED (1<<3) /* call reentered after suspension */ |
#define CIST_YPCALL (1<<4) /* call is a yieldable protected call */ |
#define CIST_STAT (1<<5) /* call has an error status (pcall) */ |
#define CIST_TAIL (1<<6) /* call was tail called */ |
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#define isLua(ci) ((ci)->callstatus & CIST_LUA) |
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/* |
** `global state', shared by all threads of this state |
*/ |
typedef struct global_State { |
lua_Alloc frealloc; /* function to reallocate memory */ |
void *ud; /* auxiliary data to `frealloc' */ |
lu_mem totalbytes; /* number of bytes currently allocated - GCdebt */ |
l_mem GCdebt; /* bytes allocated not yet compensated by the collector */ |
lu_mem lastmajormem; /* memory in use after last major collection */ |
stringtable strt; /* hash table for strings */ |
TValue l_registry; |
lu_byte currentwhite; |
lu_byte gcstate; /* state of garbage collector */ |
lu_byte gckind; /* kind of GC running */ |
lu_byte gcrunning; /* true if GC is running */ |
int sweepstrgc; /* position of sweep in `strt' */ |
GCObject *allgc; /* list of all collectable objects */ |
GCObject *finobj; /* list of collectable objects with finalizers */ |
GCObject **sweepgc; /* current position of sweep */ |
GCObject *gray; /* list of gray objects */ |
GCObject *grayagain; /* list of objects to be traversed atomically */ |
GCObject *weak; /* list of tables with weak values */ |
GCObject *ephemeron; /* list of ephemeron tables (weak keys) */ |
GCObject *allweak; /* list of all-weak tables */ |
GCObject *tobefnz; /* list of userdata to be GC */ |
UpVal uvhead; /* head of double-linked list of all open upvalues */ |
Mbuffer buff; /* temporary buffer for string concatenation */ |
int gcpause; /* size of pause between successive GCs */ |
int gcmajorinc; /* how much to wait for a major GC (only in gen. mode) */ |
int gcstepmul; /* GC `granularity' */ |
lua_CFunction panic; /* to be called in unprotected errors */ |
struct lua_State *mainthread; |
const lua_Number *version; /* pointer to version number */ |
TString *memerrmsg; /* memory-error message */ |
TString *tmname[TM_N]; /* array with tag-method names */ |
struct Table *mt[LUA_NUMTAGS]; /* metatables for basic types */ |
} global_State; |
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/* |
** `per thread' state |
*/ |
struct lua_State { |
CommonHeader; |
lu_byte status; |
StkId top; /* first free slot in the stack */ |
global_State *l_G; |
CallInfo *ci; /* call info for current function */ |
const Instruction *oldpc; /* last pc traced */ |
StkId stack_last; /* last free slot in the stack */ |
StkId stack; /* stack base */ |
int stacksize; |
unsigned short nny; /* number of non-yieldable calls in stack */ |
unsigned short nCcalls; /* number of nested C calls */ |
lu_byte hookmask; |
lu_byte allowhook; |
int basehookcount; |
int hookcount; |
lua_Hook hook; |
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) */ |
CallInfo base_ci; /* CallInfo for first level (C calling Lua) */ |
}; |
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#define G(L) (L->l_G) |
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/* |
** Union of all collectable objects |
*/ |
union GCObject { |
GCheader gch; /* common header */ |
union TString ts; |
union Udata u; |
union Closure cl; |
struct Table h; |
struct Proto p; |
struct UpVal uv; |
struct lua_State th; /* thread */ |
}; |
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#define gch(o) (&(o)->gch) |
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/* 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 gco2t(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 gco2th(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th)) |
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/* macro to convert any Lua object into a GCObject */ |
#define obj2gco(v) (cast(GCObject *, (v))) |
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/* actual number of total bytes allocated */ |
#define gettotalbytes(g) ((g)->totalbytes + (g)->GCdebt) |
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LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt); |
LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1); |
LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L); |
LUAI_FUNC void luaE_freeCI (lua_State *L); |
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#endif |
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