+++ /dev/null
-/*
-** $Id: lstate.h,v 2.128 2015/11/13 12:16:51 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"
-
-
-/*
-
-** Some notes about garbage-collected objects: All objects in Lua must
-** be kept somehow accessible until being freed, so all objects always
-** belong to one (and only one) of these lists, using field 'next' of
-** the 'CommonHeader' for the link:
-**
-** 'allgc': all objects not marked for finalization;
-** 'finobj': all objects marked for finalization;
-** 'tobefnz': all objects ready to be finalized;
-** 'fixedgc': all objects that are not to be collected (currently
-** only small strings, such as reserved words).
-
-*/
-
-
-struct lua_longjmp; /* defined in ldo.c */
-
-
-
-/* extra stack space to handle TM calls and some other extras */
-#define EXTRA_STACK 5
-
-
-#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
-
-
-/* kinds of Garbage Collection */
-#define KGC_NORMAL 0
-#define KGC_EMERGENCY 1 /* gc was forced by an allocation failure */
-
-
-typedef struct stringtable {
- TString **hash;
- int nuse; /* number of elements */
- int size;
-} stringtable;
-
-
-/*
-** Information about a call.
-** When a thread yields, 'func' is adjusted to pretend that the
-** top function has only the yielded values in its stack; in that
-** case, the actual 'func' value is saved in field 'extra'.
-** When a function calls another with a continuation, 'extra' keeps
-** the function index so that, in case of errors, the continuation
-** function can be called with the correct top.
-*/
-typedef struct CallInfo {
- StkId func; /* function index in the stack */
- StkId top; /* top for this function */
- struct CallInfo *previous, *next; /* dynamic call link */
- union {
- struct { /* only for Lua functions */
- StkId base; /* base for this function */
- const Instruction *savedpc;
- } l;
- struct { /* only for C functions */
- lua_KFunction k; /* continuation in case of yields */
- ptrdiff_t old_errfunc;
- lua_KContext ctx; /* context info. in case of yields */
- } c;
- } u;
- ptrdiff_t extra;
- short nresults; /* expected number of results from this function */
- lu_byte callstatus;
-} CallInfo;
-
-
-/*
-** Bits in CallInfo status
-*/
-#define CIST_OAH (1<<0) /* original value of 'allowhook' */
-#define CIST_LUA (1<<1) /* call is running a Lua function */
-#define CIST_HOOKED (1<<2) /* call is running a debug hook */
-#define CIST_FRESH (1<<3) /* call is running on a fresh invocation
- of luaV_execute */
-#define CIST_YPCALL (1<<4) /* call is a yieldable protected call */
-#define CIST_TAIL (1<<5) /* call was tail called */
-#define CIST_HOOKYIELD (1<<6) /* last hook called yielded */
-#define CIST_LEQ (1<<7) /* using __lt for __le */
-
-#define isLua(ci) ((ci)->callstatus & CIST_LUA)
-
-/* assume that CIST_OAH has offset 0 and that 'v' is strictly 0/1 */
-#define setoah(st,v) ((st) = ((st) & ~CIST_OAH) | (v))
-#define getoah(st) ((st) & CIST_OAH)
-
-
-/*
-** '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' */
- l_mem totalbytes; /* number of bytes currently allocated - GCdebt */
- l_mem GCdebt; /* bytes allocated not yet compensated by the collector */
- lu_mem GCmemtrav; /* memory traversed by the GC */
- lu_mem GCestimate; /* an estimate of the non-garbage memory in use */
- stringtable strt; /* hash table for strings */
- TValue l_registry;
- unsigned int seed; /* randomized seed for hashes */
- 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 */
- GCObject *allgc; /* list of all collectable objects */
- GCObject **sweepgc; /* current position of sweep in list */
- GCObject *finobj; /* list of collectable objects with finalizers */
- 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 */
- GCObject *fixedgc; /* list of objects not to be collected */
- struct lua_State *twups; /* list of threads with open upvalues */
- unsigned int gcfinnum; /* number of finalizers to call in each GC step */
- int gcpause; /* size of pause between successive GCs */
- 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 */
- TString *strcache[STRCACHE_N][STRCACHE_M]; /* cache for strings in API */
-} global_State;
-
-
-/*
-** 'per thread' state
-*/
-struct lua_State {
- CommonHeader;
- unsigned short nci; /* number of items in 'ci' list */
- 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 */
- UpVal *openupval; /* list of open upvalues in this stack */
- GCObject *gclist;
- struct lua_State *twups; /* list of threads with open upvalues */
- struct lua_longjmp *errorJmp; /* current error recover point */
- CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
- lua_Hook hook;
- ptrdiff_t errfunc; /* current error handling function (stack index) */
- int stacksize;
- int basehookcount;
- int hookcount;
- unsigned short nny; /* number of non-yieldable calls in stack */
- unsigned short nCcalls; /* number of nested C calls */
- lu_byte hookmask;
- lu_byte allowhook;
-};
-
-
-#define G(L) (L->l_G)
-
-
-/*
-** Union of all collectable objects (only for conversions)
-*/
-union GCUnion {
- GCObject gc; /* common header */
- struct TString ts;
- struct Udata u;
- union Closure cl;
- struct Table h;
- struct Proto p;
- struct lua_State th; /* thread */
-};
-
-
-#define cast_u(o) cast(union GCUnion *, (o))
-
-/* macros to convert a GCObject into a specific value */
-#define gco2ts(o) \
- check_exp(novariant((o)->tt) == LUA_TSTRING, &((cast_u(o))->ts))
-#define gco2u(o) check_exp((o)->tt == LUA_TUSERDATA, &((cast_u(o))->u))
-#define gco2lcl(o) check_exp((o)->tt == LUA_TLCL, &((cast_u(o))->cl.l))
-#define gco2ccl(o) check_exp((o)->tt == LUA_TCCL, &((cast_u(o))->cl.c))
-#define gco2cl(o) \
- check_exp(novariant((o)->tt) == LUA_TFUNCTION, &((cast_u(o))->cl))
-#define gco2t(o) check_exp((o)->tt == LUA_TTABLE, &((cast_u(o))->h))
-#define gco2p(o) check_exp((o)->tt == LUA_TPROTO, &((cast_u(o))->p))
-#define gco2th(o) check_exp((o)->tt == LUA_TTHREAD, &((cast_u(o))->th))
-
-
-/* macro to convert a Lua object into a GCObject */
-#define obj2gco(v) \
- check_exp(novariant((v)->tt) < LUA_TDEADKEY, (&(cast_u(v)->gc)))
-
-
-/* actual number of total bytes allocated */
-#define gettotalbytes(g) cast(lu_mem, (g)->totalbytes + (g)->GCdebt)
-
-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);
-LUAI_FUNC void luaE_shrinkCI (lua_State *L);
-
-
-#endif
-
projects / ardour.git / blobdiff