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+/*
+** $Id: lstate.h,v 2.133.1.1 2017/04/19 17:39:34 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).
+**
+** Moreover, there is another set of lists that control gray objects.
+** These lists are linked by fields 'gclist'. (All objects that
+** can become gray have such a field. The field is not the same
+** in all objects, but it always has this name.) Any gray object
+** must belong to one of these lists, and all objects in these lists
+** must be gray:
+**
+** 'gray': regular gray objects, still waiting to be visited.
+** 'grayagain': objects that must be revisited at the atomic phase.
+** That includes
+** - black objects got in a write barrier;
+** - all kinds of weak tables during propagation phase;
+** - all threads.
+** 'weak': tables with weak values to be cleared;
+** 'ephemeron': ephemeron tables with white->white entries;
+** 'allweak': tables with weak keys and/or weak values to be cleared.
+** The last three lists are used only during the atomic phase.
+
+*/
+
+
+struct lua_longjmp; /* defined in ldo.c */
+
+
+/*
+** Atomic type (relative to signals) to better ensure that 'lua_sethook'
+** is thread safe
+*/
+#if !defined(l_signalT)
+#include "signal.h"
+#define l_signalT sig_atomic_t
+#endif
+
+
+/* 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 */
+ unsigned short 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 CIST_FIN (1<<8) /* call is running a finalizer */
+
+#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) */
+ volatile 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 */
+ l_signalT 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
+
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