1 files changed, 335 insertions, 532 deletions

diff --git a/apps/plugins/lua/lapi.c b/apps/plugins/lua/lapi.c
index d011431ead..487d6b173a 100644
--- a/apps/plugins/lua/lapi.c
+++ b/apps/plugins/lua/lapi.c
@@ -1,10 +1,12 @@
 /*
-** $Id: lapi.c,v 2.171.1.1 2013/04/12 18:48:47 roberto Exp $
+** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
 
 
+/* #include <assert.h> */
+#include <math.h>
 #include <stdarg.h>
 #include <string.h>
 
@@ -30,80 +32,76 @@
 
 
 const char lua_ident[] =
-  "$LuaVersion: " LUA_COPYRIGHT " $"
-  "$LuaAuthors: " LUA_AUTHORS " $";
+  "$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
+  "$Authors: " LUA_AUTHORS " $\n"
+  "$URL: www.lua.org $\n";
 
 
-/* value at a non-valid index */
-#define NONVALIDVALUE           cast(TValue *, luaO_nilobject)
 
-/* corresponding test */
-#define isvalid(o)      ((o) != luaO_nilobject)
+#define api_checknelems(L, n)   api_check(L, (n) <= (L->top - L->base))
 
-/* test for pseudo index */
-#define ispseudo(i)             ((i) <= LUA_REGISTRYINDEX)
+#define api_checkvalidindex(L, i)       api_check(L, (i) != luaO_nilobject)
 
-/* test for valid but not pseudo index */
-#define isstackindex(i, o)      (isvalid(o) && !ispseudo(i))
+#define api_incr_top(L)   {api_check(L, L->top < L->ci->top); L->top++;}
 
-#define api_checkvalidindex(L, o)  api_check(L, isvalid(o), "invalid index")
 
-#define api_checkstackindex(L, i, o)  \
-        api_check(L, isstackindex(i, o), "index not in the stack")
 
-
-static TValue *index2addr (lua_State *L, int idx) {
-  CallInfo *ci = L->ci;
+static TValue *index2adr (lua_State *L, int idx) {
   if (idx > 0) {
-    TValue *o = ci->func + idx;
-    api_check(L, idx <= ci->top - (ci->func + 1), "unacceptable index");
-    if (o >= L->top) return NONVALIDVALUE;
+    TValue *o = L->base + (idx - 1);
+    api_check(L, idx <= L->ci->top - L->base);
+    if (o >= L->top) return cast(TValue *, luaO_nilobject);
     else return o;
   }
-  else if (!ispseudo(idx)) {  /* negative index */
-    api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
+  else if (idx > LUA_REGISTRYINDEX) {
+    api_check(L, idx != 0 && -idx <= L->top - L->base);
     return L->top + idx;
   }
-  else if (idx == LUA_REGISTRYINDEX)
-    return &G(L)->l_registry;
-  else {  /* upvalues */
-    idx = LUA_REGISTRYINDEX - idx;
-    api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");
-    if (ttislcf(ci->func))  /* light C function? */
-      return NONVALIDVALUE;  /* it has no upvalues */
-    else {
-      CClosure *func = clCvalue(ci->func);
-      return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : NONVALIDVALUE;
+  else switch (idx) {  /* pseudo-indices */
+    case LUA_REGISTRYINDEX: return registry(L);
+    case LUA_ENVIRONINDEX: {
+      Closure *func = curr_func(L);
+      sethvalue(L, &L->env, func->c.env);
+      return &L->env;
+    }
+    case LUA_GLOBALSINDEX: return gt(L);
+    default: {
+      Closure *func = curr_func(L);
+      idx = LUA_GLOBALSINDEX - idx;
+      return (idx <= func->c.nupvalues)
+                ? &func->c.upvalue[idx-1]
+                : cast(TValue *, luaO_nilobject);
     }
   }
 }
 
 
-/*
-** to be called by 'lua_checkstack' in protected mode, to grow stack
-** capturing memory errors
-*/
-static void growstack (lua_State *L, void *ud) {
-  int size = *(int *)ud;
-  luaD_growstack(L, size);
+static Table *getcurrenv (lua_State *L) {
+  if (L->ci == L->base_ci)  /* no enclosing function? */
+    return hvalue(gt(L));  /* use global table as environment */
+  else {
+    Closure *func = curr_func(L);
+    return func->c.env;
+  }
+}
+
+
+void luaA_pushobject (lua_State *L, const TValue *o) {
+  setobj2s(L, L->top, o);
+  api_incr_top(L);
 }
 
 
 LUA_API int lua_checkstack (lua_State *L, int size) {
-  int res;
-  CallInfo *ci = L->ci;
+  int res = 1;
   lua_lock(L);
-  if (L->stack_last - L->top > size)  /* stack large enough? */
-    res = 1;  /* yes; check is OK */
-  else {  /* no; need to grow stack */
-    int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;
-    if (inuse > LUAI_MAXSTACK - size)  /* can grow without overflow? */
-      res = 0;  /* no */
-    else  /* try to grow stack */
-      res = (luaD_rawrunprotected(L, &growstack, &size) == LUA_OK);
+  if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
+    res = 0;  /* stack overflow */
+  else if (size > 0) {
+    luaD_checkstack(L, size);
+    if (L->ci->top < L->top + size)
+      L->ci->top = L->top + size;
   }
-  if (res && ci->top < L->top + size)
-    ci->top = L->top + size;  /* adjust frame top */
   lua_unlock(L);
   return res;
 }
@@ -114,8 +112,8 @@ LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
   if (from == to) return;
   lua_lock(to);
   api_checknelems(from, n);
-  api_check(from, G(from) == G(to), "moving among independent states");
-  api_check(from, to->ci->top - to->top >= n, "not enough elements to move");
+  api_check(from, G(from) == G(to));
+  api_check(from, to->ci->top - to->top >= n);
   from->top -= n;
   for (i = 0; i < n; i++) {
     setobj2s(to, to->top++, from->top + i);
@@ -124,6 +122,11 @@ LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
 }
 
 
+LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
+  to->nCcalls = from->nCcalls;
+}
+
+
 LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
   lua_CFunction old;
   lua_lock(L);
@@ -134,10 +137,16 @@ LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
 }
 
 
-LUA_API const lua_Number *lua_version (lua_State *L) {
-  static const lua_Number version = LUA_VERSION_NUM;
-  if (L == NULL) return &version;
-  else return G(L)->version;
+LUA_API lua_State *lua_newthread (lua_State *L) {
+  lua_State *L1;
+  lua_lock(L);
+  luaC_checkGC(L);
+  L1 = luaE_newthread(L);
+  setthvalue(L, L->top, L1);
+  api_incr_top(L);
+  lua_unlock(L);
+  luai_userstatethread(L, L1);
+  return L1;
 }
 
 
@@ -147,32 +156,21 @@ LUA_API const lua_Number *lua_version (lua_State *L) {
 */
 
 
-/*
-** convert an acceptable stack index into an absolute index
-*/
-LUA_API int lua_absindex (lua_State *L, int idx) {
-  return (idx > 0 || ispseudo(idx))
-         ? idx
-         : cast_int(L->top - L->ci->func + idx);
-}
-
-
 LUA_API int lua_gettop (lua_State *L) {
-  return cast_int(L->top - (L->ci->func + 1));
+  return cast_int(L->top - L->base);
 }
 
 
 LUA_API void lua_settop (lua_State *L, int idx) {
-  StkId func = L->ci->func;
   lua_lock(L);
   if (idx >= 0) {
-    api_check(L, idx <= L->stack_last - (func + 1), "new top too large");
-    while (L->top < (func + 1) + idx)
+    api_check(L, idx <= L->stack_last - L->base);
+    while (L->top < L->base + idx)
       setnilvalue(L->top++);
-    L->top = (func + 1) + idx;
+    L->top = L->base + idx;
   }
   else {
-    api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
+    api_check(L, -(idx+1) <= (L->top - L->base));
     L->top += idx+1;  /* `subtract' index (index is negative) */
   }
   lua_unlock(L);
@@ -182,8 +180,8 @@ LUA_API void lua_settop (lua_State *L, int idx) {
 LUA_API void lua_remove (lua_State *L, int idx) {
   StkId p;
   lua_lock(L);
-  p = index2addr(L, idx);
-  api_checkstackindex(L, idx, p);
+  p = index2adr(L, idx);
+  api_checkvalidindex(L, p);
   while (++p < L->top) setobjs2s(L, p-1, p);
   L->top--;
   lua_unlock(L);
@@ -194,47 +192,42 @@ LUA_API void lua_insert (lua_State *L, int idx) {
   StkId p;
   StkId q;
   lua_lock(L);
-  p = index2addr(L, idx);
-  api_checkstackindex(L, idx, p);
-  for (q = L->top; q > p; q--)  /* use L->top as a temporary */
-    setobjs2s(L, q, q - 1);
+  p = index2adr(L, idx);
+  api_checkvalidindex(L, p);
+  for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
   setobjs2s(L, p, L->top);
   lua_unlock(L);
 }
 
 
-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, clCvalue(L->ci->func), fr);
-  /* LUA_REGISTRYINDEX does not need gc barrier
-     (collector revisits it before finishing collection) */
-}
-
-
 LUA_API void lua_replace (lua_State *L, int idx) {
+  StkId o;
   lua_lock(L);
+  /* explicit test for incompatible code */
+  if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
+    luaG_runerror(L, "no calling environment");
   api_checknelems(L, 1);
-  moveto(L, L->top - 1, idx);
+  o = index2adr(L, idx);
+  api_checkvalidindex(L, o);
+  if (idx == LUA_ENVIRONINDEX) {
+    Closure *func = curr_func(L);
+    api_check(L, ttistable(L->top - 1)); 
+    func->c.env = hvalue(L->top - 1);
+    luaC_barrier(L, func, L->top - 1);
+  }
+  else {
+    setobj(L, o, L->top - 1);
+    if (idx < LUA_GLOBALSINDEX)  /* function upvalue? */
+      luaC_barrier(L, curr_func(L), L->top - 1);
+  }
   L->top--;
   lua_unlock(L);
 }
 
 
-LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {
-  TValue *fr;
-  lua_lock(L);
-  fr = index2addr(L, fromidx);
-  moveto(L, fr, toidx);
-  lua_unlock(L);
-}
-
-
 LUA_API void lua_pushvalue (lua_State *L, int idx) {
   lua_lock(L);
-  setobj2s(L, L->top, index2addr(L, idx));
+  setobj2s(L, L->top, index2adr(L, idx));
   api_incr_top(L);
   lua_unlock(L);
 }
@@ -247,26 +240,26 @@ 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 (isvalid(o) ? ttypenv(o) : LUA_TNONE);
+  StkId o = index2adr(L, idx);
+  return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
 }
 
 
 LUA_API const char *lua_typename (lua_State *L, int t) {
   UNUSED(L);
-  return ttypename(t);
+  return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
 }
 
 
 LUA_API int lua_iscfunction (lua_State *L, int idx) {
-  StkId o = index2addr(L, idx);
-  return (ttislcf(o) || (ttisCclosure(o)));
+  StkId o = index2adr(L, idx);
+  return iscfunction(o);
 }
 
 
 LUA_API int lua_isnumber (lua_State *L, int idx) {
   TValue n;
-  const TValue *o = index2addr(L, idx);
+  const TValue *o = index2adr(L, idx);
   return tonumber(o, &n);
 }
 
@@ -278,116 +271,77 @@ LUA_API int lua_isstring (lua_State *L, int idx) {
 
 
 LUA_API int lua_isuserdata (lua_State *L, int idx) {
-  const TValue *o = index2addr(L, idx);
+  const TValue *o = index2adr(L, idx);
   return (ttisuserdata(o) || ttislightuserdata(o));
 }
 
 
 LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
-  StkId o1 = index2addr(L, index1);
-  StkId o2 = index2addr(L, index2);
-  return (isvalid(o1) && isvalid(o2)) ? luaV_rawequalobj(o1, o2) : 0;
+  StkId o1 = index2adr(L, index1);
+  StkId o2 = index2adr(L, index2);
+  return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
+         : luaO_rawequalObj(o1, o2);
 }
 
 
-LUA_API void lua_arith (lua_State *L, int op) {
-  StkId o1;  /* 1st operand */
-  StkId o2;  /* 2nd operand */
-  lua_lock(L);
-  if (op != LUA_OPUNM) /* all other operations expect two operands */
-    api_checknelems(L, 2);
-  else {  /* for unary minus, add fake 2nd operand */
-    api_checknelems(L, 1);
-    setobjs2s(L, L->top, L->top - 1);
-    L->top++;
-  }
-  o1 = L->top - 2;
-  o2 = L->top - 1;
-  if (ttisnumber(o1) && ttisnumber(o2)) {
-    setnvalue(o1, luaO_arith(op, nvalue(o1), nvalue(o2)));
-  }
-  else
-    luaV_arith(L, o1, o1, o2, cast(TMS, op - LUA_OPADD + TM_ADD));
-  L->top--;
+LUA_API int lua_equal (lua_State *L, int index1, int index2) {
+  StkId o1, o2;
+  int i;
+  lua_lock(L);  /* may call tag method */
+  o1 = index2adr(L, index1);
+  o2 = index2adr(L, index2);
+  i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
   lua_unlock(L);
+  return i;
 }
 
 
-LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
+LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
   StkId o1, o2;
-  int i = 0;
+  int i;
   lua_lock(L);  /* may call tag method */
-  o1 = index2addr(L, index1);
-  o2 = index2addr(L, index2);
-  if (isvalid(o1) && isvalid(o2)) {
-    switch (op) {
-      case LUA_OPEQ: i = equalobj(L, o1, o2); break;
-      case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
-      case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;
-      default: api_check(L, 0, "invalid option");
-    }
-  }
+  o1 = index2adr(L, index1);
+  o2 = index2adr(L, index2);
+  i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
+       : luaV_lessthan(L, o1, o2);
   lua_unlock(L);
   return i;
 }
 
 
-LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *isnum) {
+
+LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
   TValue n;
-  const TValue *o = index2addr(L, idx);
-  if (tonumber(o, &n)) {
-    if (isnum) *isnum = 1;
+  const TValue *o = index2adr(L, idx);
+  if (tonumber(o, &n))
     return nvalue(o);
-  }
-  else {
-    if (isnum) *isnum = 0;
+  else
     return 0;
-  }
 }
 
 
-LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *isnum) {
+LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
   TValue n;
-  const TValue *o = index2addr(L, idx);
+  const TValue *o = index2adr(L, idx);
   if (tonumber(o, &n)) {
     lua_Integer res;
     lua_Number num = nvalue(o);
     lua_number2integer(res, num);
-    if (isnum) *isnum = 1;
-    return res;
-  }
-  else {
-    if (isnum) *isnum = 0;
-    return 0;
-  }
-}
-
-
-LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *isnum) {
-  TValue n;
-  const TValue *o = index2addr(L, idx);
-  if (tonumber(o, &n)) {
-    lua_Unsigned res;
-    lua_Number num = nvalue(o);
-    lua_number2unsigned(res, num);
-    if (isnum) *isnum = 1;
     return res;
   }
-  else {
-    if (isnum) *isnum = 0;
+  else
     return 0;
-  }
 }
 
 
 LUA_API int lua_toboolean (lua_State *L, int idx) {
-  const TValue *o = index2addr(L, idx);
+  const TValue *o = index2adr(L, idx);
   return !l_isfalse(o);
 }
 
 
 LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
-  StkId o = index2addr(L, idx);
+  StkId o = index2adr(L, idx);
   if (!ttisstring(o)) {
     lua_lock(L);  /* `luaV_tostring' may create a new string */
     if (!luaV_tostring(L, o)) {  /* conversion failed? */
@@ -396,7 +350,7 @@ LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
       return NULL;
     }
     luaC_checkGC(L);
-    o = index2addr(L, idx);  /* previous call may reallocate the stack */
+    o = index2adr(L, idx);  /* previous call may reallocate the stack */
     lua_unlock(L);
   }
   if (len != NULL) *len = tsvalue(o)->len;
@@ -404,29 +358,33 @@ LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
 }
 
 
-LUA_API size_t lua_rawlen (lua_State *L, int idx) {
-  StkId o = index2addr(L, idx);
-  switch (ttypenv(o)) {
+LUA_API size_t lua_objlen (lua_State *L, int idx) {
+  StkId o = index2adr(L, idx);
+  switch (ttype(o)) {
     case LUA_TSTRING: return tsvalue(o)->len;
     case LUA_TUSERDATA: return uvalue(o)->len;
     case LUA_TTABLE: return luaH_getn(hvalue(o));
+    case LUA_TNUMBER: {
+      size_t l;
+      lua_lock(L);  /* `luaV_tostring' may create a new string */
+      l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
+      lua_unlock(L);
+      return l;
+    }
     default: return 0;
   }
 }
 
 
 LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
-  StkId o = index2addr(L, idx);
-  if (ttislcf(o)) return fvalue(o);
-  else if (ttisCclosure(o))
-    return clCvalue(o)->f;
-  else return NULL;  /* not a C function */
+  StkId o = index2adr(L, idx);
+  return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
 }
 
 
 LUA_API void *lua_touserdata (lua_State *L, int idx) {
-  StkId o = index2addr(L, idx);
-  switch (ttypenv(o)) {
+  StkId o = index2adr(L, idx);
+  switch (ttype(o)) {
     case LUA_TUSERDATA: return (rawuvalue(o) + 1);
     case LUA_TLIGHTUSERDATA: return pvalue(o);
     default: return NULL;
@@ -435,18 +393,16 @@ LUA_API void *lua_touserdata (lua_State *L, int idx) {
 
 
 LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
-  StkId o = index2addr(L, idx);
+  StkId o = index2adr(L, idx);
   return (!ttisthread(o)) ? NULL : thvalue(o);
 }
 
 
 LUA_API const void *lua_topointer (lua_State *L, int idx) {
-  StkId o = index2addr(L, idx);
+  StkId o = index2adr(L, idx);
   switch (ttype(o)) {
     case LUA_TTABLE: return hvalue(o);
-    case LUA_TLCL: return clLvalue(o);
-    case LUA_TCCL: return clCvalue(o);
-    case LUA_TLCF: return cast(void *, cast(size_t, fvalue(o)));
+    case LUA_TFUNCTION: return clvalue(o);
     case LUA_TTHREAD: return thvalue(o);
     case LUA_TUSERDATA:
     case LUA_TLIGHTUSERDATA:
@@ -473,8 +429,6 @@ LUA_API void lua_pushnil (lua_State *L) {
 LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
   lua_lock(L);
   setnvalue(L->top, n);
-  luai_checknum(L, L->top,
-    luaG_runerror(L, "C API - attempt to push a signaling NaN"));
   api_incr_top(L);
   lua_unlock(L);
 }
@@ -488,43 +442,20 @@ LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
 }
 
 
-LUA_API void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
-  lua_Number n;
-  lua_lock(L);
-  n = lua_unsigned2number(u);
-  setnvalue(L->top, n);
-  api_incr_top(L);
-  lua_unlock(L);
-}
-
-
-LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {
-  TString *ts;
+LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
   lua_lock(L);
   luaC_checkGC(L);
-  ts = luaS_newlstr(L, s, len);
-  setsvalue2s(L, L->top, ts);
+  setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
   api_incr_top(L);
   lua_unlock(L);
-  return getstr(ts);
 }
 
 
-LUA_API const char *lua_pushstring (lua_State *L, const char *s) {
-  if (s == NULL) {
+LUA_API void lua_pushstring (lua_State *L, const char *s) {
+  if (s == NULL)
     lua_pushnil(L);
-    return NULL;
-  }
-  else {
-    TString *ts;
-    lua_lock(L);
-    luaC_checkGC(L);
-    ts = luaS_new(L, s);
-    setsvalue2s(L, L->top, ts);
-    api_incr_top(L);
-    lua_unlock(L);
-    return getstr(ts);
-  }
+  else
+    lua_pushlstring(L, s, strlen(s));
 }
 
 
@@ -553,22 +484,17 @@ 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);
-  if (n == 0) {
-    setfvalue(L->top, fn);
-  }
-  else {
-    Closure *cl;
-    api_checknelems(L, n);
-    api_check(L, n <= MAXUPVAL, "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);
-    setclCvalue(L, L->top, cl);
-  }
+  luaC_checkGC(L);
+  api_checknelems(L, n);
+  cl = luaF_newCclosure(L, n, getcurrenv(L));
+  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)));
   api_incr_top(L);
   lua_unlock(L);
 }
@@ -605,21 +531,11 @@ LUA_API int lua_pushthread (lua_State *L) {
 */
 
 
-LUA_API void lua_getglobal (lua_State *L, const char *var) {
-  Table *reg = hvalue(&G(L)->l_registry);
-  const TValue *gt;  /* global table */
-  lua_lock(L);
-  gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
-  setsvalue2s(L, L->top++, luaS_new(L, var));
-  luaV_gettable(L, gt, L->top - 1, L->top - 1);
-  lua_unlock(L);
-}
-
-
 LUA_API void lua_gettable (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
-  t = index2addr(L, idx);
+  t = index2adr(L, idx);
+  api_checkvalidindex(L, t);
   luaV_gettable(L, t, L->top - 1, L->top - 1);
   lua_unlock(L);
 }
@@ -627,11 +543,13 @@ LUA_API void lua_gettable (lua_State *L, int idx) {
 
 LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
   StkId t;
+  TValue key;
   lua_lock(L);
-  t = index2addr(L, idx);
-  setsvalue2s(L, L->top, luaS_new(L, k));
+  t = index2adr(L, idx);
+  api_checkvalidindex(L, t);
+  setsvalue(L, &key, luaS_new(L, k));
+  luaV_gettable(L, t, &key, L->top);
   api_incr_top(L);
-  luaV_gettable(L, t, L->top - 1, L->top - 1);
   lua_unlock(L);
 }
 
@@ -639,46 +557,29 @@ LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
 LUA_API void lua_rawget (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
+  t = index2adr(L, idx);
+  api_check(L, ttistable(t));
   setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
   lua_unlock(L);
 }
 
 
 LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
-  StkId t;
-  lua_lock(L);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
-  setobj2s(L, L->top, luaH_getint(hvalue(t), n));
-  api_incr_top(L);
-  lua_unlock(L);
-}
-
-
-LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) {
-  StkId t;
-  TValue k;
+  StkId o;
   lua_lock(L);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
-  setpvalue(&k, cast(void *, p));
-  setobj2s(L, L->top, luaH_get(hvalue(t), &k));
+  o = index2adr(L, idx);
+  api_check(L, ttistable(o));
+  setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
   api_incr_top(L);
   lua_unlock(L);
 }
 
 
 LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
-  Table *t;
   lua_lock(L);
   luaC_checkGC(L);
-  t = luaH_new(L);
-  sethvalue(L, L->top, t);
+  sethvalue(L, L->top, luaH_new(L, narray, nrec));
   api_incr_top(L);
-  if (narray > 0 || nrec > 0)
-    luaH_resize(L, t, narray, nrec);
   lua_unlock(L);
 }
 
@@ -688,8 +589,8 @@ LUA_API int lua_getmetatable (lua_State *L, int objindex) {
   Table *mt = NULL;
   int res;
   lua_lock(L);
-  obj = index2addr(L, objindex);
-  switch (ttypenv(obj)) {
+  obj = index2adr(L, objindex);
+  switch (ttype(obj)) {
     case LUA_TTABLE:
       mt = hvalue(obj)->metatable;
       break;
@@ -697,7 +598,7 @@ LUA_API int lua_getmetatable (lua_State *L, int objindex) {
       mt = uvalue(obj)->metatable;
       break;
     default:
-      mt = G(L)->mt[ttypenv(obj)];
+      mt = G(L)->mt[ttype(obj)];
       break;
   }
   if (mt == NULL)
@@ -712,15 +613,25 @@ LUA_API int lua_getmetatable (lua_State *L, int objindex) {
 }
 
 
-LUA_API void lua_getuservalue (lua_State *L, int idx) {
+LUA_API void lua_getfenv (lua_State *L, int idx) {
   StkId o;
   lua_lock(L);
-  o = index2addr(L, idx);
-  api_check(L, ttisuserdata(o), "userdata expected");
-  if (uvalue(o)->env) {
-    sethvalue(L, L->top, uvalue(o)->env);
-  } else
-    setnilvalue(L->top);
+  o = index2adr(L, idx);
+  api_checkvalidindex(L, o);
+  switch (ttype(o)) {
+    case LUA_TFUNCTION:
+      sethvalue(L, L->top, clvalue(o)->c.env);
+      break;
+    case LUA_TUSERDATA:
+      sethvalue(L, L->top, uvalue(o)->env);
+      break;
+    case LUA_TTHREAD:
+      setobj2s(L, L->top,  gt(thvalue(o)));
+      break;
+    default:
+      setnilvalue(L->top);
+      break;
+  }
   api_incr_top(L);
   lua_unlock(L);
 }
@@ -731,24 +642,12 @@ LUA_API void lua_getuservalue (lua_State *L, int idx) {
 */
 
 
-LUA_API void lua_setglobal (lua_State *L, const char *var) {
-  Table *reg = hvalue(&G(L)->l_registry);
-  const TValue *gt;  /* global table */
-  lua_lock(L);
-  api_checknelems(L, 1);
-  gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
-  setsvalue2s(L, L->top++, luaS_new(L, var));
-  luaV_settable(L, gt, L->top - 1, L->top - 2);
-  L->top -= 2;  /* pop value and key */
-  lua_unlock(L);
-}
-
-
 LUA_API void lua_settable (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
   api_checknelems(L, 2);
-  t = index2addr(L, idx);
+  t = index2adr(L, idx);
+  api_checkvalidindex(L, t);
   luaV_settable(L, t, L->top - 2, L->top - 1);
   L->top -= 2;  /* pop index and value */
   lua_unlock(L);
@@ -757,12 +656,14 @@ LUA_API void lua_settable (lua_State *L, int idx) {
 
 LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
   StkId t;
+  TValue key;
   lua_lock(L);
   api_checknelems(L, 1);
-  t = index2addr(L, idx);
-  setsvalue2s(L, L->top++, luaS_new(L, k));
-  luaV_settable(L, t, L->top - 1, L->top - 2);
-  L->top -= 2;  /* pop value and key */
+  t = index2adr(L, idx);
+  api_checkvalidindex(L, t);
+  setsvalue(L, &key, luaS_new(L, k));
+  luaV_settable(L, t, &key, L->top - 1);
+  L->top--;  /* pop value */
   lua_unlock(L);
 }
 
@@ -771,39 +672,23 @@ LUA_API void lua_rawset (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
   api_checknelems(L, 2);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
+  t = index2adr(L, idx);
+  api_check(L, ttistable(t));
   setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
-  invalidateTMcache(hvalue(t));
-  luaC_barrierback(L, gcvalue(t), L->top-1);
+  luaC_barriert(L, hvalue(t), L->top-1);
   L->top -= 2;
   lua_unlock(L);
 }
 
 
 LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
-  StkId t;
-  lua_lock(L);
-  api_checknelems(L, 1);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
-  luaH_setint(L, hvalue(t), n, L->top - 1);
-  luaC_barrierback(L, gcvalue(t), L->top-1);
-  L->top--;
-  lua_unlock(L);
-}
-
-
-LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
-  StkId t;
-  TValue k;
+  StkId o;
   lua_lock(L);
   api_checknelems(L, 1);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
-  setpvalue(&k, cast(void *, p));
-  setobj2t(L, luaH_set(L, hvalue(t), &k), L->top - 1);
-  luaC_barrierback(L, gcvalue(t), L->top - 1);
+  o = index2adr(L, idx);
+  api_check(L, ttistable(o));
+  setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
+  luaC_barriert(L, hvalue(o), L->top-1);
   L->top--;
   lua_unlock(L);
 }
@@ -814,32 +699,29 @@ LUA_API int lua_setmetatable (lua_State *L, int objindex) {
   Table *mt;
   lua_lock(L);
   api_checknelems(L, 1);
-  obj = index2addr(L, objindex);
+  obj = index2adr(L, objindex);
+  api_checkvalidindex(L, obj);
   if (ttisnil(L->top - 1))
     mt = NULL;
   else {
-    api_check(L, ttistable(L->top - 1), "table expected");
+    api_check(L, ttistable(L->top - 1));
     mt = hvalue(L->top - 1);
   }
-  switch (ttypenv(obj)) {
+  switch (ttype(obj)) {
     case LUA_TTABLE: {
       hvalue(obj)->metatable = mt;
-      if (mt) {
-        luaC_objbarrierback(L, gcvalue(obj), mt);
-        luaC_checkfinalizer(L, gcvalue(obj), mt);
-      }
+      if (mt)
+        luaC_objbarriert(L, hvalue(obj), mt);
       break;
     }
     case LUA_TUSERDATA: {
       uvalue(obj)->metatable = mt;
-      if (mt) {
+      if (mt)
         luaC_objbarrier(L, rawuvalue(obj), mt);
-        luaC_checkfinalizer(L, gcvalue(obj), mt);
-      }
       break;
     }
     default: {
-      G(L)->mt[ttypenv(obj)] = mt;
+      G(L)->mt[ttype(obj)] = mt;
       break;
     }
   }
@@ -849,21 +731,32 @@ LUA_API int lua_setmetatable (lua_State *L, int objindex) {
 }
 
 
-LUA_API void lua_setuservalue (lua_State *L, int idx) {
+LUA_API int lua_setfenv (lua_State *L, int idx) {
   StkId o;
+  int res = 1;
   lua_lock(L);
   api_checknelems(L, 1);
-  o = index2addr(L, idx);
-  api_check(L, ttisuserdata(o), "userdata expected");
-  if (ttisnil(L->top - 1))
-    uvalue(o)->env = NULL;
-  else {
-    api_check(L, ttistable(L->top - 1), "table expected");
-    uvalue(o)->env = hvalue(L->top - 1);
-    luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
+  o = index2adr(L, idx);
+  api_checkvalidindex(L, o);
+  api_check(L, ttistable(L->top - 1));
+  switch (ttype(o)) {
+    case LUA_TFUNCTION:
+      clvalue(o)->c.env = hvalue(L->top - 1);
+      break;
+    case LUA_TUSERDATA:
+      uvalue(o)->env = hvalue(L->top - 1);
+      break;
+    case LUA_TTHREAD:
+      sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
+      break;
+    default:
+      res = 0;
+      break;
   }
+  if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
   L->top--;
   lua_unlock(L);
+  return res;
 }
 
 
@@ -872,37 +765,21 @@ LUA_API void lua_setuservalue (lua_State *L, int idx) {
 */
 
 
-#define checkresults(L,na,nr) \
-     api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \
-        "results from function overflow current stack size")
-
+#define adjustresults(L,nres) \
+    { if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
 
-LUA_API int lua_getctx (lua_State *L, int *ctx) {
-  if (L->ci->callstatus & CIST_YIELDED) {
-    if (ctx) *ctx = L->ci->u.c.ctx;
-    return L->ci->u.c.status;
-  }
-  else return LUA_OK;
-}
 
+#define checkresults(L,na,nr) \
+     api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
+        
 
-LUA_API void lua_callk (lua_State *L, int nargs, int nresults, int ctx,
-                        lua_CFunction k) {
+LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
   StkId func;
   lua_lock(L);
-  api_check(L, k == NULL || !isLua(L->ci),
-    "cannot use continuations inside hooks");
   api_checknelems(L, nargs+1);
-  api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
   checkresults(L, nargs, nresults);
   func = L->top - (nargs+1);
-  if (k != NULL && L->nny == 0) {  /* need to prepare continuation? */
-    L->ci->u.c.k = k;  /* save continuation */
-    L->ci->u.c.ctx = ctx;  /* save context */
-    luaD_call(L, func, nresults, 1);  /* do the call */
-  }
-  else  /* no continuation or no yieldable */
-    luaD_call(L, func, nresults, 0);  /* just do the call */
+  luaD_call(L, func, nresults);
   adjustresults(L, nresults);
   lua_unlock(L);
 }
@@ -920,75 +797,76 @@ struct CallS {  /* data to `f_call' */
 
 static void f_call (lua_State *L, void *ud) {
   struct CallS *c = cast(struct CallS *, ud);
-  luaD_call(L, c->func, c->nresults, 0);
+  luaD_call(L, c->func, c->nresults);
 }
 
 
 
-LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,
-                        int ctx, lua_CFunction k) {
+LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
   struct CallS c;
   int status;
   ptrdiff_t func;
   lua_lock(L);
-  api_check(L, k == NULL || !isLua(L->ci),
-    "cannot use continuations inside hooks");
   api_checknelems(L, nargs+1);
-  api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
   checkresults(L, nargs, nresults);
   if (errfunc == 0)
     func = 0;
   else {
-    StkId o = index2addr(L, errfunc);
-    api_checkstackindex(L, errfunc, o);
+    StkId o = index2adr(L, errfunc);
+    api_checkvalidindex(L, o);
     func = savestack(L, o);
   }
   c.func = L->top - (nargs+1);  /* function to be called */
-  if (k == NULL || L->nny > 0) {  /* no continuation or no yieldable? */
-    c.nresults = nresults;  /* do a 'conventional' protected call */
-    status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
-  }
-  else {  /* prepare continuation (call is already protected by 'resume') */
-    CallInfo *ci = L->ci;
-    ci->u.c.k = k;  /* save continuation */
-    ci->u.c.ctx = ctx;  /* save context */
-    /* save information for error recovery */
-    ci->extra = savestack(L, c.func);
-    ci->u.c.old_allowhook = L->allowhook;
-    ci->u.c.old_errfunc = L->errfunc;
-    L->errfunc = func;
-    /* mark that function may do error recovery */
-    ci->callstatus |= CIST_YPCALL;
-    luaD_call(L, c.func, nresults, 1);  /* do the call */
-    ci->callstatus &= ~CIST_YPCALL;
-    L->errfunc = ci->u.c.old_errfunc;
-    status = LUA_OK;  /* if it is here, there were no errors */
-  }
+  c.nresults = nresults;
+  status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
   adjustresults(L, nresults);
   lua_unlock(L);
   return status;
 }
 
 
+/*
+** Execute a protected C call.
+*/
+struct CCallS {  /* data to `f_Ccall' */
+  lua_CFunction func;
+  void *ud;
+};
+
+
+static void f_Ccall (lua_State *L, void *ud) {
+  struct CCallS *c = cast(struct CCallS *, ud);
+  Closure *cl;
+  cl = luaF_newCclosure(L, 0, getcurrenv(L));
+  cl->c.f = c->func;
+  setclvalue(L, L->top, cl);  /* push function */
+  api_incr_top(L);
+  setpvalue(L->top, c->ud);  /* push only argument */
+  api_incr_top(L);
+  luaD_call(L, L->top - 2, 0);
+}
+
+
+LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
+  struct CCallS c;
+  int status;
+  lua_lock(L);
+  c.func = func;
+  c.ud = ud;
+  status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
+  lua_unlock(L);
+  return status;
+}
+
+
 LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
-                      const char *chunkname, const char *mode) {
+                      const char *chunkname) {
   ZIO z;
   int status;
   lua_lock(L);
   if (!chunkname) chunkname = "?";
   luaZ_init(L, &z, reader, data);
-  status = luaD_protectedparser(L, &z, chunkname, mode);
-  if (status == LUA_OK) {  /* no errors? */
-    LClosure *f = clLvalue(L->top - 1);  /* get newly created function */
-    if (f->nupvalues == 1) {  /* does it have one upvalue? */
-      /* get global table from registry */
-      Table *reg = hvalue(&G(L)->l_registry);
-      const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
-      /* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
-      setobj(L, f->upvals[0]->v, gt);
-      luaC_barrier(L, f->upvals[0], gt);
-    }
-  }
+  status = luaD_protectedparser(L, &z, chunkname);
   lua_unlock(L);
   return status;
 }
@@ -1001,7 +879,7 @@ LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
   api_checknelems(L, 1);
   o = L->top - 1;
   if (isLfunction(o))
-    status = luaU_dump(L, getproto(o), writer, data, 0);
+    status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
   else
     status = 1;
   lua_unlock(L);
@@ -1009,7 +887,7 @@ LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
 }
 
 
-LUA_API int lua_status (lua_State *L) {
+LUA_API int  lua_status (lua_State *L) {
   return L->status;
 }
 
@@ -1025,40 +903,38 @@ LUA_API int lua_gc (lua_State *L, int what, int data) {
   g = G(L);
   switch (what) {
     case LUA_GCSTOP: {
-      g->gcrunning = 0;
+      g->GCthreshold = MAX_LUMEM;
       break;
     }
     case LUA_GCRESTART: {
-      luaE_setdebt(g, 0);
-      g->gcrunning = 1;
+      g->GCthreshold = g->totalbytes;
       break;
     }
     case LUA_GCCOLLECT: {
-      luaC_fullgc(L, 0);
+      luaC_fullgc(L);
       break;
     }
     case LUA_GCCOUNT: {
       /* GC values are expressed in Kbytes: #bytes/2^10 */
-      res = cast_int(gettotalbytes(g) >> 10);
+      res = cast_int(g->totalbytes >> 10);
       break;
     }
     case LUA_GCCOUNTB: {
-      res = cast_int(gettotalbytes(g) & 0x3ff);
+      res = cast_int(g->totalbytes & 0x3ff);
       break;
     }
     case LUA_GCSTEP: {
-      if (g->gckind == KGC_GEN) {  /* generational mode? */
-        res = (g->GCestimate == 0);  /* true if it will do major collection */
-        luaC_forcestep(L);  /* do a single step */
-      }
-      else {
-       lu_mem debt = cast(lu_mem, data) * 1024 - GCSTEPSIZE;
-       if (g->gcrunning)
-         debt += g->GCdebt;  /* include current debt */
-       luaE_setdebt(g, debt);
-       luaC_forcestep(L);
-       if (g->gcstate == GCSpause)  /* end of cycle? */
-         res = 1;  /* signal it */
+      lu_mem a = (cast(lu_mem, data) << 10);
+      if (a <= g->totalbytes)
+        g->GCthreshold = g->totalbytes - a;
+      else
+        g->GCthreshold = 0;
+      while (g->GCthreshold <= g->totalbytes) {
+        luaC_step(L);
+        if (g->gcstate == GCSpause) {  /* end of cycle? */
+          res = 1;  /* signal it */
+          break;
+        }
       }
       break;
     }
@@ -1067,28 +943,11 @@ LUA_API int lua_gc (lua_State *L, int what, int data) {
       g->gcpause = data;
       break;
     }
-    case LUA_GCSETMAJORINC: {
-      res = g->gcmajorinc;
-      g->gcmajorinc = data;
-      break;
-    }
     case LUA_GCSETSTEPMUL: {
       res = g->gcstepmul;
       g->gcstepmul = data;
       break;
     }
-    case LUA_GCISRUNNING: {
-      res = g->gcrunning;
-      break;
-    }
-    case LUA_GCGEN: {  /* change collector to generational mode */
-      luaC_changemode(L, KGC_GEN);
-      break;
-    }
-    case LUA_GCINC: {  /* change collector to incremental mode */
-      luaC_changemode(L, KGC_NORMAL);
-      break;
-    }
     default: res = -1;  /* invalid option */
   }
   lua_unlock(L);
@@ -1106,7 +965,7 @@ LUA_API int lua_error (lua_State *L) {
   lua_lock(L);
   api_checknelems(L, 1);
   luaG_errormsg(L);
-  /* code unreachable; will unlock when control actually leaves the kernel */
+  lua_unlock(L);
   return 0;  /* to avoid warnings */
 }
 
@@ -1115,8 +974,8 @@ LUA_API int lua_next (lua_State *L, int idx) {
   StkId t;
   int more;
   lua_lock(L);
-  t = index2addr(L, idx);
-  api_check(L, ttistable(t), "table expected");
+  t = index2adr(L, idx);
+  api_check(L, ttistable(t));
   more = luaH_next(L, hvalue(t), L->top - 1);
   if (more) {
     api_incr_top(L);
@@ -1133,7 +992,8 @@ LUA_API void lua_concat (lua_State *L, int n) {
   api_checknelems(L, n);
   if (n >= 2) {
     luaC_checkGC(L);
-    luaV_concat(L, n);
+    luaV_concat(L, n, cast_int(L->top - L->base) - 1);
+    L->top -= (n-1);
   }
   else if (n == 0) {  /* push empty string */
     setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
@@ -1144,16 +1004,6 @@ LUA_API void lua_concat (lua_State *L, int n) {
 }
 
 
-LUA_API void lua_len (lua_State *L, int idx) {
-  StkId t;
-  lua_lock(L);
-  t = index2addr(L, idx);
-  luaV_objlen(L, L->top, t);
-  api_incr_top(L);
-  lua_unlock(L);
-}
-
-
 LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
   lua_Alloc f;
   lua_lock(L);
@@ -1176,7 +1026,7 @@ LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
   Udata *u;
   lua_lock(L);
   luaC_checkGC(L);
-  u = luaS_newudata(L, size, NULL);
+  u = luaS_newudata(L, size, getcurrenv(L));
   setuvalue(L, L->top, u);
   api_incr_top(L);
   lua_unlock(L);
@@ -1185,36 +1035,30 @@ LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
 
 
 
-static const char *aux_upvalue (StkId fi, int n, TValue **val,
-                                GCObject **owner) {
-  switch (ttype(fi)) {
-    case LUA_TCCL: {  /* C closure */
-      CClosure *f = clCvalue(fi);
-      if (!(1 <= n && n <= f->nupvalues)) return NULL;
-      *val = &f->upvalue[n-1];
-      if (owner) *owner = obj2gco(f);
-      return "";
-    }
-    case LUA_TLCL: {  /* Lua closure */
-      LClosure *f = clLvalue(fi);
-      TString *name;
-      Proto *p = f->p;
-      if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
-      *val = f->upvals[n-1]->v;
-      if (owner) *owner = obj2gco(f->upvals[n - 1]);
-      name = p->upvalues[n-1].name;
-      return (name == NULL) ? "" : getstr(name);
-    }
-    default: return NULL;  /* not a closure */
+
+static const char *aux_upvalue (StkId fi, int n, TValue **val) {
+  Closure *f;
+  if (!ttisfunction(fi)) return NULL;
+  f = clvalue(fi);
+  if (f->c.isC) {
+    if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
+    *val = &f->c.upvalue[n-1];
+    return "";
+  }
+  else {
+    Proto *p = f->l.p;
+    if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
+    *val = f->l.upvals[n-1]->v;
+    return getstr(p->upvalues[n-1]);
   }
 }
 
 
 LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
   const char *name;
-  TValue *val = NULL;  /* to avoid warnings */
+  TValue *val;
   lua_lock(L);
-  name = aux_upvalue(index2addr(L, funcindex), n, &val, NULL);
+  name = aux_upvalue(index2adr(L, funcindex), n, &val);
   if (name) {
     setobj2s(L, L->top, val);
     api_incr_top(L);
@@ -1226,59 +1070,18 @@ LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
 
 LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
   const char *name;
-  TValue *val = NULL;  /* to avoid warnings */
-  GCObject *owner = NULL;  /* to avoid warnings */
+  TValue *val;
   StkId fi;
   lua_lock(L);
-  fi = index2addr(L, funcindex);
+  fi = index2adr(L, funcindex);
   api_checknelems(L, 1);
-  name = aux_upvalue(fi, n, &val, &owner);
+  name = aux_upvalue(fi, n, &val);
   if (name) {
     L->top--;
     setobj(L, val, L->top);
-    luaC_barrier(L, owner, L->top);
+    luaC_barrier(L, clvalue(fi), L->top);
   }
   lua_unlock(L);
   return name;
 }
 
-
-static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
-  LClosure *f;
-  StkId fi = index2addr(L, fidx);
-  api_check(L, ttisLclosure(fi), "Lua function expected");
-  f = clLvalue(fi);
-  api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
-  if (pf) *pf = f;
-  return &f->upvals[n - 1];  /* get its upvalue pointer */
-}
-
-
-LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
-  StkId fi = index2addr(L, fidx);
-  switch (ttype(fi)) {
-    case LUA_TLCL: {  /* lua closure */
-      return *getupvalref(L, fidx, n, NULL);
-    }
-    case LUA_TCCL: {  /* C closure */
-      CClosure *f = clCvalue(fi);
-      api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
-      return &f->upvalue[n - 1];
-    }
-    default: {
-      api_check(L, 0, "closure expected");
-      return NULL;
-    }
-  }
-}
-
-
-LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
-                                            int fidx2, int n2) {
-  LClosure *f1;
-  UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
-  UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
-  *up1 = *up2;
-  luaC_objbarrier(L, f1, *up2);
-}
-