GEEKING

App/Lua-5.1.4/src/lstate.h

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+/*
+** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 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"
+
+
+
+struct lua_longjmp;  /* defined in ldo.c */
+
+
+/* table of globals */
+#define gt(L)	(&L->l_gt)
+
+/* registry */
+#define registry(L)	(&G(L)->l_registry)
+
+
+/* extra stack space to handle TM calls and some other extras */
+#define EXTRA_STACK   5
+
+
+#define BASIC_CI_SIZE           8
+
+#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)
+
+
+
+typedef struct stringtable {
+LUAVM_SHUFFLE3(;,
+  GCObject **hash,
+  lu_int32 nuse,  /* number of elements */
+  int size);
+} stringtable;
+
+
+/*
+** informations about a call
+*/
+typedef struct CallInfo {
+LUAVM_SHUFFLE6(;,
+  StkId base,  /* base for this function */
+  StkId func,  /* function index in the stack */
+  StkId	top,  /* top for this function */
+  const InstructionV *savedpc,
+  int nresults,  /* expected number of results from this function */
+  int tailcalls);  /* number of tail calls lost under this entry */
+} CallInfo;
+
+
+
+#define curr_func(L)	(clvalue(L->ci->func))
+#define ci_func(ci)	(clvalue((ci)->func))
+#define f_isLua(ci)	(!ci_func(ci)->c.isC)
+#define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))
+
+
+/*
+** `global state', shared by all threads of this state
+*/
+typedef struct global_State {
+  stringtable strt;  /* hash table for strings */
+
+LUAVM_SHUFFLE2(;,
+  lua_Alloc frealloc,  /* function to reallocate memory */
+  void *ud);         /* auxiliary data to `frealloc' */
+
+LUAVM_SHUFFLE2(;,
+  lu_byte currentwhite,
+  lu_byte gcstate);  /* state of garbage collector */
+
+LUAVM_SHUFFLE8(;,
+  LuaVMValue<unsigned int> ckey,
+    
+  int sweepstrgc,  /* position of sweep in `strt' */
+  GCObject *rootgc,  /* list of all collectable objects */
+  GCObject **sweepgc,  /* position of sweep in `rootgc' */
+  GCObject *gray,  /* list of gray objects */
+  GCObject *grayagain,  /* list of objects to be traversed atomically */
+  GCObject *weak,  /* list of weak tables (to be cleared) */
+  GCObject *tmudata);  /* last element of list of userdata to be GC */
+
+  Mbuffer buff;  /* temporary buffer for string concatentation */
+
+LUAVM_SHUFFLE7(;,
+  lu_mem GCthreshold,
+  lu_mem totalbytes,  /* number of bytes currently allocated */
+  lu_mem estimate,  /* an estimate of number of bytes actually in use */
+  lu_mem gcdept,  /* how much GC is `behind schedule' */
+  int gcpause,  /* size of pause between successive GCs */
+  int gcstepmul,  /* GC `granularity' */
+  LuaVMValue<lua_CFunction> panic);  /* to be called in unprotected errors */
+
+LUAVM_SHUFFLE5(;,
+  TValue l_registry,
+  struct lua_State *mainthread,
+  UpVal uvhead,  /* head of double-linked list of all open upvalues */
+  struct Table *mt[NUM_TAGS],  /* metatables for basic types */
+  LuaVMValue<TString *> tmname[TM_N]);  /* array with tag-method names */
+} global_State;
+
+
+/*
+** `per thread' state
+*/
+struct lua_State {
+  CommonHeader;
+  lu_byte status;
+
+LUAVM_SHUFFLE7(;,
+  StkId top,  /* first free slot in the stack */
+  StkId base,  /* base of current function */
+  LuaVMValue<global_State *> l_G,
+  CallInfo *ci,  /* call info for current function */
+  LuaVMValue<const InstructionV *> savedpc,  /* `savedpc' of current function */
+  StkId stack_last,  /* last free slot in the stack */
+  StkId stack); /* stack base */
+
+LUAVM_SHUFFLE4(;,
+  CallInfo *end_ci,  /* points after end of ci array*/
+  CallInfo *base_ci,  /* array of CallInfo's */
+  int stacksize,
+  int size_ci);  /* size of array `base_ci' */
+
+LUAVM_SHUFFLE2(;,
+  unsigned short nCcalls,  /* number of nested C calls */
+  unsigned short baseCcalls);  /* nested C calls when resuming coroutine */
+
+LUAVM_SHUFFLE2(;,
+  lu_byte hookmask,
+  lu_byte allowhook);
+
+LUAVM_SHUFFLE9(;,
+  int basehookcount,
+  int hookcount,
+  lua_Hook hook,
+  TValue l_gt,  /* table of globals */
+  TValue env,  /* temporary place for environments */
+  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) */
+};
+
+
+#define G(L)	(L->l_G)
+
+
+/*
+** Union of all collectable objects
+*/
+union GCObject {
+  GCheader gch;
+  union TString ts;
+  union Udata u;
+  union Closure cl;
+  struct Table h;
+  struct Proto p;
+  struct UpVal uv;
+  struct lua_State th;  /* thread */
+};
+
+
+/* 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 gco2h(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 ngcotouv(o) \
+	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
+#define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
+
+/* macro to convert any Lua object into a GCObject */
+#define obj2gco(v)	(cast(GCObject *, (v)))
+
+
+LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
+LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
+
+#endif
+