1 files changed, 228 insertions, 0 deletions

diff --git a/lstate.h b/lstate.h
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+/*
+** $Id: lstate.h,v 2.82 2012/07/02 13:37:04 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.
+**
+** 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.
+
+*/
+
+
+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 */
+#define KGC_GEN         2       /* generational collection */
+
+
+typedef struct stringtable {
+  GCObject **hash;
+  lu_int32 nuse;  /* number of elements */
+  int size;
+} stringtable;
+
+
+/*
+** 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;
+  ptrdiff_t extra;
+  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;
+      lu_byte old_allowhook;
+      lu_byte status;
+    } c;
+  } u;
+} CallInfo;
+
+
+/*
+** 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 */
+#define CIST_HOOKYIELD  (1<<7)  /* last hook called yielded */
+
+
+#define isLua(ci)       ((ci)->callstatus & CIST_LUA)
+
+
+/*
+** `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 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 */
+  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 in list 'allgc' */
+  GCObject **sweepfin;  /* current position of sweep in list 'finobj' */
+  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;  /* pause between major collections (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;
+
+
+/*
+** `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) */
+};
+
+
+#define G(L)    (L->l_G)
+
+
+/*
+** 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 */
+};
+
+
+#define gch(o)          (&(o)->gch)
+
+/* macros to convert a GCObject into a specific value */
+#define rawgco2ts(o)  \
+        check_exp(novariant((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 gco2lcl(o)      check_exp((o)->gch.tt == LUA_TLCL, &((o)->cl.l))
+#define gco2ccl(o)      check_exp((o)->gch.tt == LUA_TCCL, &((o)->cl.c))
+#define gco2cl(o)  \
+        check_exp(novariant((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))
+
+/* macro to convert any Lua object into a GCObject */
+#define obj2gco(v)      (cast(GCObject *, (v)))
+
+
+/* actual number of total bytes allocated */
+#define gettotalbytes(g)        ((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);
+
+
+#endif
+