From 7dfa4cd655118faf164427356609fec31906dac2 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 14 Apr 2010 12:13:48 -0300
Subject: [PATCH] first implementation of light C functions

---
 lapi.c    | 68 +++++++++++++++++++++++++++++++++----------------------
 ldebug.c  | 32 ++++++++++++++------------
 ldo.c     | 54 ++++++++++++++++++++++++-------------------
 lobject.c |  4 +++-
 lobject.h | 39 +++++++++++++++++++++++--------
 lstate.h  |  3 +--
 ltable.c  |  4 +++-
 ltests.c  |  9 +++++---
 ltm.c     |  4 ++--
 ltm.h     |  5 ++--
 lvm.c     |  7 +++---
 11 files changed, 141 insertions(+), 88 deletions(-)

diff --git a/lapi.c b/lapi.c
index 0ed2734d..805eedef 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 2.119 2010/04/02 15:19:19 roberto Exp roberto $
+** $Id: lapi.c,v 2.120 2010/04/05 14:21:38 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -54,12 +54,16 @@ static TValue *index2addr (lua_State *L, int idx) {
   else if (idx == LUA_REGISTRYINDEX)
     return &G(L)->l_registry;
   else {  /* upvalues */
-    Closure *func = curr_func(L);
     idx = LUA_REGISTRYINDEX - idx;
     api_check(L, idx <= UCHAR_MAX + 1, "upvalue index too large");
-    return (idx <= func->c.nupvalues)
-              ? &func->c.upvalue[idx-1]
-              : cast(TValue *, luaO_nilobject);
+    if (ttiscfp(ci->func))  /* C-function pointer? */
+      return cast(TValue *, luaO_nilobject);  /* it has no upvalues */
+    else {
+      Closure *func = clvalue(ci->func);
+      return (idx <= func->c.nupvalues)
+                ? &func->c.upvalue[idx-1]
+                : cast(TValue *, luaO_nilobject);
+    }
   }
 }
 
@@ -181,8 +185,10 @@ static void moveto (lua_State *L, TValue *fr, int idx) {
   TValue *to = index2addr(L, idx);
   api_checkvalidindex(L, to);
   setobj(L, to, fr);
-  if (idx < LUA_REGISTRYINDEX)  /* function upvalue? */
-    luaC_barrier(L, curr_func(L), fr);
+  if (idx < LUA_REGISTRYINDEX) {  /* function upvalue? */
+    lua_assert(ttisclosure(L->ci->func));
+    luaC_barrier(L, clvalue(L->ci->func), fr);
+  }
   /* LUA_REGISTRYINDEX does not need gc barrier
      (collector revisits it before finishing collection) */
 }
@@ -223,19 +229,19 @@ LUA_API void lua_pushvalue (lua_State *L, int idx) {
 
 LUA_API int lua_type (lua_State *L, int idx) {
   StkId o = index2addr(L, idx);
-  return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
+  return (o == luaO_nilobject) ? LUA_TNONE : ttypenv(o);
 }
 
 
 LUA_API const char *lua_typename (lua_State *L, int t) {
   UNUSED(L);
-  return typename(t);
+  return ttypename(t);
 }
 
 
 LUA_API int lua_iscfunction (lua_State *L, int idx) {
   StkId o = index2addr(L, idx);
-  return iscfunction(o);
+  return (ttiscfp(o) || (ttisclosure(o) && clvalue(o)->c.isC));
 }
 
 
@@ -361,7 +367,10 @@ LUA_API size_t lua_rawlen (lua_State *L, int idx) {
 
 LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
   StkId o = index2addr(L, idx);
-  return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
+  if (ttiscfp(o)) return fvalue(o);
+  else if (ttisclosure(o) && clvalue(o)->c.isC)
+    return clvalue(o)->c.f;
+  else return NULL;  /* not a C function */
 }
 
 
@@ -386,6 +395,7 @@ LUA_API const void *lua_topointer (lua_State *L, int idx) {
   switch (ttype(o)) {
     case LUA_TTABLE: return hvalue(o);
     case LUA_TFUNCTION: return clvalue(o);
+    case LUA_TCFP: return cast(void *, cast(size_t, fvalue(o)));
     case LUA_TTHREAD: return thvalue(o);
     case LUA_TUSERDATA:
     case LUA_TLIGHTUSERDATA:
@@ -480,18 +490,22 @@ LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
 
 
 LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
-  Closure *cl;
   lua_lock(L);
-  api_checknelems(L, n);
-  api_check(L, n <= UCHAR_MAX, "upvalue index too large");
-  luaC_checkGC(L);
-  cl = luaF_newCclosure(L, n);
-  cl->c.f = fn;
-  L->top -= n;
-  while (n--)
-    setobj2n(L, &cl->c.upvalue[n], L->top+n);
-  setclvalue(L, L->top, cl);
-  lua_assert(iswhite(obj2gco(cl)));
+  if (n == 0) {
+    setfvalue(L->top, fn);
+  }
+  else {
+    Closure *cl;
+    api_checknelems(L, n);
+    api_check(L, n <= UCHAR_MAX, "upvalue index too large");
+    luaC_checkGC(L);
+    cl = luaF_newCclosure(L, n);
+    cl->c.f = fn;
+    L->top -= n;
+    while (n--)
+      setobj2n(L, &cl->c.upvalue[n], L->top + n);
+    setclvalue(L, L->top, cl);
+  }
   api_incr_top(L);
   lua_unlock(L);
 }
@@ -598,7 +612,7 @@ LUA_API int lua_getmetatable (lua_State *L, int objindex) {
       mt = uvalue(obj)->metatable;
       break;
     default:
-      mt = G(L)->mt[ttype(obj)];
+      mt = G(L)->mt[ttypenv(obj)];
       break;
   }
   if (mt == NULL)
@@ -713,7 +727,7 @@ LUA_API int lua_setmetatable (lua_State *L, int objindex) {
       break;
     }
     default: {
-      G(L)->mt[ttype(obj)] = mt;
+      G(L)->mt[ttypenv(obj)] = mt;
       break;
     }
   }
@@ -1063,7 +1077,7 @@ LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
 
 static const char *aux_upvalue (StkId fi, int n, TValue **val) {
   Closure *f;
-  if (!ttisfunction(fi)) return NULL;
+  if (!ttisclosure(fi)) return NULL;
   f = clvalue(fi);
   if (f->c.isC) {
     if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
@@ -1115,7 +1129,7 @@ static UpVal **getupvalref (lua_State *L, int fidx, int n, Closure **pf) {
   Closure *f;
   Proto *p;
   StkId fi = index2addr(L, fidx);
-  api_check(L, ttisfunction(fi), "function expected");
+  api_check(L, ttisclosure(fi), "Lua function expected");
   f = clvalue(fi);
   api_check(L, !f->c.isC, "Lua function expected");
   p = f->l.p;
@@ -1128,7 +1142,7 @@ static UpVal **getupvalref (lua_State *L, int fidx, int n, Closure **pf) {
 LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
   Closure *f;
   StkId fi = index2addr(L, fidx);
-  api_check(L, ttisfunction(fi), "function expected");
+  api_check(L, ttisclosure(fi), "function expected");
   f = clvalue(fi);
   if (f->c.isC) {
     api_check(L, 1 <= n && n <= f->c.nupvalues, "invalid upvalue index");
diff --git a/ldebug.c b/ldebug.c
index 03c86762..9b3e2d1c 100644
--- a/ldebug.c
+++ b/ldebug.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.68 2010/04/05 16:26:37 roberto Exp roberto $
+** $Id: ldebug.c,v 2.69 2010/04/08 17:06:33 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -144,7 +144,7 @@ LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
 
 
 static void funcinfo (lua_Debug *ar, Closure *cl) {
-  if (cl->c.isC) {
+  if (cl == NULL || cl->c.isC) {
     ar->source = "=[C]";
     ar->linedefined = -1;
     ar->lastlinedefined = -1;
@@ -191,8 +191,8 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
         break;
       }
       case 'u': {
-        ar->nups = f->c.nupvalues;
-        if (f->c.isC) {
+        ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
+        if (f == NULL || f->c.isC) {
           ar->isvararg = 1;
           ar->nparams = 0;
         }
@@ -226,28 +226,30 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
 
 LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
   int status;
-  Closure *f = NULL;
-  CallInfo *ci = NULL;
+  Closure *cl;
+  CallInfo *ci;
+  StkId func;
   lua_lock(L);
   if (*what == '>') {
-    StkId func = L->top - 1;
+    ci = NULL;
+    func = L->top - 1;
     luai_apicheck(L, ttisfunction(func));
     what++;  /* skip the '>' */
-    f = clvalue(func);
     L->top--;  /* pop function */
   }
   else {
     ci = ar->i_ci;
+    func = ci->func;
     lua_assert(ttisfunction(ci->func));
-    f = clvalue(ci->func);
   }
-  status = auxgetinfo(L, what, ar, f, ci);
+  cl = ttisclosure(func) ? clvalue(func) : NULL;
+  status = auxgetinfo(L, what, ar, cl, ci);
   if (strchr(what, 'f')) {
-    setclvalue(L, L->top, f);
+    setobjs2s(L, L->top, func);
     incr_top(L);
   }
   if (strchr(what, 'L'))
-    collectvalidlines(L, f);
+    collectvalidlines(L, cl);
   lua_unlock(L);
   return status;
 }
@@ -439,7 +441,7 @@ static const char *getupvalname (CallInfo *ci, const TValue *o,
 void luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
   CallInfo *ci = L->ci;
   const char *name = NULL;
-  const char *t = typename(ttype(o));
+  const char *t = objtypename(o);
   const char *kind = NULL;
   if (isLua(ci)) {
     kind = getupvalname(ci, o, &name);  /* check whether 'o' is an upvalue */
@@ -470,8 +472,8 @@ void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
 
 
 int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
-  const char *t1 = typename(ttype(p1));
-  const char *t2 = typename(ttype(p2));
+  const char *t1 = objtypename(p1);
+  const char *t2 = objtypename(p2);
   if (t1 == t2)
     luaG_runerror(L, "attempt to compare two %s values", t1);
   else
diff --git a/ldo.c b/ldo.c
index 400afa0f..56813c04 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 2.82 2010/03/26 20:58:11 roberto Exp roberto $
+** $Id: ldo.c,v 2.83 2010/04/08 17:16:46 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -293,18 +293,43 @@ static StkId tryfuncTM (lua_State *L, StkId func) {
 ** returns true if function has been executed (C function)
 */
 int luaD_precall (lua_State *L, StkId func, int nresults) {
-  LClosure *cl;
+  Closure *cl;
+  lua_CFunction f;
   ptrdiff_t funcr;
   if (!ttisfunction(func)) /* `func' is not a function? */
     func = tryfuncTM(L, func);  /* check the `function' tag method */
   funcr = savestack(L, func);
-  cl = &clvalue(func)->l;
   L->ci->nresults = nresults;
-  if (!cl->isC) {  /* Lua function? prepare its call */
+  if (ttiscfp(func)) {  /* C function pointer? */
+    f = fvalue(func);  /* get it */
+    goto isCfunc;  /* go to call it */
+  }
+  cl = clvalue(func);
+  if (cl->c.isC) {  /* C closure? */
+    CallInfo *ci;
+    int n;
+    f = cl->c.f;
+  isCfunc:  /* call C function 'f' */
+    luaD_checkstack(L, LUA_MINSTACK);  /* ensure minimum stack size */
+    ci = next_ci(L);  /* now 'enter' new function */
+    ci->func = restorestack(L, funcr);
+    ci->top = L->top + LUA_MINSTACK;
+    lua_assert(ci->top <= L->stack_last);
+    ci->callstatus = 0;
+    if (L->hookmask & LUA_MASKCALL)
+      luaD_hook(L, LUA_HOOKCALL, -1);
+    lua_unlock(L);
+    n = (*f)(L);  /* do the actual call */
+    lua_lock(L);
+    api_checknelems(L, n);
+    luaD_poscall(L, L->top - n);
+    return 1;
+  }
+  else {  /* Lua function: prepare its call */
     CallInfo *ci;
     int nparams, nargs;
     StkId base;
-    Proto *p = cl->p;
+    Proto *p = cl->l.p;
     luaD_checkstack(L, p->maxstacksize);
     func = restorestack(L, funcr);
     nargs = cast_int(L->top - func) - 1;  /* number of real arguments */
@@ -327,24 +352,6 @@ int luaD_precall (lua_State *L, StkId func, int nresults) {
       callhook(L, ci);
     return 0;
   }
-  else {  /* if is a C function, call it */
-    CallInfo *ci;
-    int n;
-    luaD_checkstack(L, LUA_MINSTACK);  /* ensure minimum stack size */
-    ci = next_ci(L);  /* now 'enter' new function */
-    ci->func = restorestack(L, funcr);
-    ci->top = L->top + LUA_MINSTACK;
-    lua_assert(ci->top <= L->stack_last);
-    ci->callstatus = 0;
-    if (L->hookmask & LUA_MASKCALL)
-      luaD_hook(L, LUA_HOOKCALL, -1);
-    lua_unlock(L);
-    n = (*curr_func(L)->c.f)(L);  /* do the actual call */
-    lua_lock(L);
-    api_checknelems(L, n);
-    luaD_poscall(L, L->top - n);
-    return 1;
-  }
 }
 
 
@@ -526,6 +533,7 @@ LUA_API int lua_resume (lua_State *L, int nargs) {
   luai_userstateresume(L, nargs);
   ++G(L)->nCcalls;  /* count resume */
   L->nny = 0;  /* allow yields */
+  api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);
   status = luaD_rawrunprotected(L, resume, L->top - nargs);
   if (status == -1)  /* error calling 'lua_resume'? */
     status = LUA_ERRRUN;
diff --git a/lobject.c b/lobject.c
index 3c87da1c..548c1d05 100644
--- a/lobject.c
+++ b/lobject.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.c,v 2.36 2010/04/02 15:30:27 roberto Exp roberto $
+** $Id: lobject.c,v 2.37 2010/04/05 16:26:37 roberto Exp roberto $
 ** Some generic functions over Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -83,6 +83,8 @@ int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
       return pvalue(t1) == pvalue(t2);
     case LUA_TSTRING:
       return rawtsvalue(t1) == rawtsvalue(t2);
+    case LUA_TCFP:
+      return fvalue(t1) == fvalue(t2);
     default:
       lua_assert(iscollectable(t1));
       return gcvalue(t1) == gcvalue(t2);
diff --git a/lobject.h b/lobject.h
index ce8e9e26..f093b3cb 100644
--- a/lobject.h
+++ b/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.36 2010/03/26 20:58:11 roberto Exp roberto $
+** $Id: lobject.h,v 2.37 2010/04/12 16:07:06 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -24,6 +24,12 @@
 #define LUA_TDEADKEY	(LUA_NUMTAGS+2)
 
 
+/*
+** Variant tag for C-function pointers (negative to be considered
+** non collectable by 'iscollectable')
+*/
+#define LUA_TCFP	(~0x0F | LUA_TFUNCTION)
+
 /*
 ** Union of all collectable objects
 */
@@ -54,6 +60,7 @@ typedef union {
   void *p;
   lua_Number n;
   int b;
+  lua_CFunction f;
 } Value;
 
 
@@ -73,12 +80,26 @@ typedef struct lua_TValue {
 #define NILCONSTANT    {NULL}, LUA_TNIL
 
 
+/*
+** type tag of a TValue
+*/
+#define ttype(o)	((o)->tt_)
+
+
+/*
+** type tag of a TValue with no variants
+*/
+#define ttypenv(o)	(ttype(o) & 0x0F)
+
+
 /* Macros to test type */
 #define ttisnil(o)	(ttype(o) == LUA_TNIL)
 #define ttisnumber(o)	(ttype(o) == LUA_TNUMBER)
 #define ttisstring(o)	(ttype(o) == LUA_TSTRING)
 #define ttistable(o)	(ttype(o) == LUA_TTABLE)
-#define ttisfunction(o)	(ttype(o) == LUA_TFUNCTION)
+#define ttisfunction(o)	(ttypenv(o) == LUA_TFUNCTION)
+#define ttisclosure(o)	(ttype(o) == LUA_TFUNCTION)
+#define ttiscfp(o)	(ttype(o) == LUA_TCFP)
 #define ttisboolean(o)	(ttype(o) == LUA_TBOOLEAN)
 #define ttisuserdata(o)	(ttype(o) == LUA_TUSERDATA)
 #define ttisthread(o)	(ttype(o) == LUA_TTHREAD)
@@ -86,7 +107,6 @@ typedef struct lua_TValue {
 #define ttisdeadkey(o)	(ttype(o) == LUA_TDEADKEY)
 
 /* Macros to access values */
-#define ttype(o)	((o)->tt_)
 #define gcvalue(o)	check_exp(iscollectable(o), (o)->value_.gc)
 #define pvalue(o)	check_exp(ttislightuserdata(o), (o)->value_.p)
 #define nvalue(o)	check_exp(ttisnumber(o), (o)->value_.n)
@@ -94,16 +114,15 @@ typedef struct lua_TValue {
 #define tsvalue(o)	(&rawtsvalue(o)->tsv)
 #define rawuvalue(o)	check_exp(ttisuserdata(o), &(o)->value_.gc->u)
 #define uvalue(o)	(&rawuvalue(o)->uv)
-#define clvalue(o)	check_exp(ttisfunction(o), &(o)->value_.gc->cl)
+#define clvalue(o)	check_exp(ttisclosure(o), &(o)->value_.gc->cl)
+#define fvalue(o)	check_exp(ttiscfp(o), (o)->value_.f)
 #define hvalue(o)	check_exp(ttistable(o), &(o)->value_.gc->h)
 #define bvalue(o)	check_exp(ttisboolean(o), (o)->value_.b)
 #define thvalue(o)	check_exp(ttisthread(o), &(o)->value_.gc->th)
 
 #define l_isfalse(o)	(ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
 
-/*
-** for internal debug only
-*/
+
 #define iscollectable(o)	(ttype(o) >= LUA_TSTRING)
 
 #define righttt(obj)		(ttype(obj) == gcvalue(obj)->gch.tt)
@@ -120,6 +139,9 @@ typedef struct lua_TValue {
 #define setnvalue(obj,x) \
   { TValue *i_o=(obj); i_o->value_.n=(x); i_o->tt_=LUA_TNUMBER; }
 
+#define setfvalue(obj,x) \
+  { TValue *i_o=(obj); i_o->value_.f=(x); i_o->tt_=LUA_TCFP; }
+
 #define changenvalue(obj,x) \
   ( lua_assert((obj)->tt_==LUA_TNUMBER), (obj)->value_.n=(x) )
 
@@ -313,8 +335,7 @@ typedef union Closure {
 } Closure;
 
 
-#define iscfunction(o)	(ttisfunction(o) && clvalue(o)->c.isC)
-#define isLfunction(o)	(ttisfunction(o) && !clvalue(o)->c.isC)
+#define isLfunction(o)	(ttisclosure(o) && !clvalue(o)->c.isC)
 
 #define getproto(o)	(clvalue(o)->l.p)
 
diff --git a/lstate.h b/lstate.h
index fc496b12..734898d0 100644
--- a/lstate.h
+++ b/lstate.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.61 2010/04/08 17:16:46 roberto Exp roberto $
+** $Id: lstate.h,v 2.62 2010/04/12 16:07:06 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -105,7 +105,6 @@ typedef struct CallInfo {
 #define CIST_TAIL	(1<<6)	/* call was tail called */
 
 
-#define curr_func(L)	(clvalue(L->ci->func))
 #define ci_func(ci)	(clvalue((ci)->func))
 #define isLua(ci)	((ci)->callstatus & CIST_LUA)
 
diff --git a/ltable.c b/ltable.c
index c7a7606b..7eb1f4a9 100644
--- a/ltable.c
+++ b/ltable.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.c,v 2.47 2009/12/17 15:46:44 roberto Exp roberto $
+** $Id: ltable.c,v 2.48 2010/04/05 16:26:37 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -109,6 +109,8 @@ static Node *mainposition (const Table *t, const TValue *key) {
       return hashboolean(t, bvalue(key));
     case LUA_TLIGHTUSERDATA:
       return hashpointer(t, pvalue(key));
+    case LUA_TCFP:
+      return hashpointer(t, fvalue(key));
     default:
       return hashpointer(t, gcvalue(key));
   }
diff --git a/ltests.c b/ltests.c
index b8276ce5..58fcb5b9 100644
--- a/ltests.c
+++ b/ltests.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.c,v 2.92 2010/04/12 12:42:07 roberto Exp roberto $
+** $Id: ltests.c,v 2.93 2010/04/12 16:07:39 roberto Exp roberto $
 ** Internal Module for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
@@ -191,7 +191,7 @@ static void printobj (global_State *g, GCObject *o) {
   GCObject *p;
   for (p = g->allgc; p != o && p != NULL; p = gch(p)->next) i++;
   if (p == NULL) i = -1;
-  printf("%d:%s(%p)-%c(%02X)", i, typename(gch(o)->tt), (void *)o,
+  printf("%d:%s(%p)-%c(%02X)", i, ttypename(gch(o)->tt), (void *)o,
            isdead(g,o)?'d':isblack(o)?'b':iswhite(o)?'w':'g', gch(o)->marked);
 }
 
@@ -519,7 +519,7 @@ static int mem_query (lua_State *L) {
     const char *t = luaL_checkstring(L, 1);
     int i;
     for (i = LUA_NUMTAGS - 1; i >= 0; i--) {
-      if (strcmp(t, typename(i)) == 0) {
+      if (strcmp(t, ttypename(i)) == 0) {
         lua_pushinteger(L, l_memcontrol.objcount[i]);
         return 1;
       }
@@ -944,6 +944,9 @@ static int runC (lua_State *L, lua_State *L1, const char *pc) {
     else if EQ("tonumber") {
       lua_pushnumber(L1, lua_tonumber(L1, getindex));
     }
+    else if EQ("topointer") {
+      lua_pushlightuserdata(L1, cast(void *, lua_topointer(L1, getindex)));
+    }
     else if EQ("tostring") {
       const char *s = lua_tostring(L1, getindex);
       const char *s1 = lua_pushstring(L1, s);
diff --git a/ltm.c b/ltm.c
index b859164b..1d1e5d1a 100644
--- a/ltm.c
+++ b/ltm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.c,v 2.10 2009/11/19 19:06:52 roberto Exp roberto $
+** $Id: ltm.c,v 2.11 2010/01/13 16:18:25 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -70,7 +70,7 @@ const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
       mt = uvalue(o)->metatable;
       break;
     default:
-      mt = G(L)->mt[ttype(o)];
+      mt = G(L)->mt[ttypenv(o)];
   }
   return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
 }
diff --git a/ltm.h b/ltm.h
index adb1b2e3..be079b30 100644
--- a/ltm.h
+++ b/ltm.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.h,v 2.8 2009/11/19 19:06:52 roberto Exp roberto $
+** $Id: ltm.h,v 2.9 2010/01/13 16:18:25 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -43,7 +43,8 @@ typedef enum {
 
 #define fasttm(l,et,e)	gfasttm(G(l), et, e)
 
-#define typename(x)	luaT_typenames_[(x) + 1]
+#define ttypename(x)	luaT_typenames_[(x) + 1]
+#define objtypename(x)	ttypename(ttypenv(x))
 
 LUAI_DDEC const char *const luaT_typenames_[];
 
diff --git a/lvm.c b/lvm.c
index d9d63f35..41be38a7 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.109 2010/04/02 15:39:07 roberto Exp roberto $
+** $Id: lvm.c,v 2.110 2010/04/05 16:26:37 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -218,7 +218,7 @@ static int l_strcmp (const TString *ls, const TString *rs) {
 
 int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
   int res;
-  if (ttype(l) != ttype(r))
+  if (ttypenv(l) != ttypenv(r))
     return luaG_ordererror(L, l, r);
   else if (ttisnumber(l))
     return luai_numlt(L, nvalue(l), nvalue(r));
@@ -232,7 +232,7 @@ int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
 
 int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
   int res;
-  if (ttype(l) != ttype(r))
+  if (ttypenv(l) != ttypenv(r))
     return luaG_ordererror(L, l, r);
   else if (ttisnumber(l))
     return luai_numle(L, nvalue(l), nvalue(r));
@@ -254,6 +254,7 @@ int luaV_equalval_ (lua_State *L, const TValue *t1, const TValue *t2) {
     case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
     case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2);  /* true must be 1 !! */
     case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
+    case LUA_TCFP: return fvalue(t1) == fvalue(t2);
     case LUA_TSTRING: return eqstr(rawtsvalue(t1), rawtsvalue(t2));
     case LUA_TUSERDATA: {
       if (uvalue(t1) == uvalue(t2)) return 1;