diff --git a/ldebug.c b/ldebug.c
index 776b05eb..4193cda8 100644
--- a/ldebug.c
+++ b/ldebug.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.124 2017/04/29 15:28:38 roberto Exp roberto $
+** $Id: ldebug.c,v 2.125 2017/05/13 13:04:33 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -136,7 +136,7 @@ static const char *findlocal (lua_State *L, CallInfo *ci, int n,
   const char *name = NULL;
   StkId base;
   if (isLua(ci)) {
-    base = ci->u.l.base;
+    base = ci->func + 1;
     name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
   }
   else
@@ -562,8 +562,9 @@ static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
 ** checks are ISO C and ensure a correct result.
 */
 static int isinstack (CallInfo *ci, const TValue *o) {
-  ptrdiff_t i = o - ci->u.l.base;
-  return (0 <= i && i < (ci->top - ci->u.l.base) && ci->u.l.base + i == o);
+  StkId base = ci->func + 1;
+  ptrdiff_t i = o - base;
+  return (0 <= i && i < (ci->top - base) && base + i == o);
 }
 
 
@@ -594,7 +595,7 @@ static const char *varinfo (lua_State *L, const TValue *o) {
     kind = getupvalname(ci, o, &name);  /* check whether 'o' is an upvalue */
     if (!kind && isinstack(ci, o))  /* no? try a register */
       kind = getobjname(ci_func(ci)->p, currentpc(ci),
-                        cast_int(o - ci->u.l.base), &name);
+                        cast_int(o - (ci->func + 1)), &name);
   }
   return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
 }
diff --git a/ldo.c b/ldo.c
index 14d1adc6..5e28fda6 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 2.157 2016/12/13 15:52:21 roberto Exp roberto $
+** $Id: ldo.c,v 2.158 2017/05/13 12:57:20 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -164,8 +164,6 @@ static void correctstack (lua_State *L, TValue *oldstack) {
   for (ci = L->ci; ci != NULL; ci = ci->previous) {
     ci->top = (ci->top - oldstack) + L->stack;
     ci->func = (ci->func - oldstack) + L->stack;
-    if (isLua(ci))
-      ci->u.l.base = (ci->u.l.base - oldstack) + L->stack;
   }
 }
 
@@ -424,7 +422,6 @@ int luaD_precall (lua_State *L, StkId func, int nresults) {
       ci = next_ci(L);  /* now 'enter' new function */
       ci->nresults = nresults;
       ci->func = func;
-      ci->u.l.base = func + 1;
       L->top = ci->top = func + 1 + fsize;
       lua_assert(ci->top <= L->stack_last);
       ci->u.l.savedpc = p->code;  /* starting point */
diff --git a/lstate.h b/lstate.h
index 533d6ad6..d2dabc4d 100644
--- a/lstate.h
+++ b/lstate.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.139 2017/04/24 16:59:26 roberto Exp roberto $
+** $Id: lstate.h,v 2.140 2017/05/04 13:32:01 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -96,7 +96,6 @@ typedef struct CallInfo {
   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 */
diff --git a/lvm.c b/lvm.c
index 3053d929..284646bb 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.280 2017/05/11 18:57:46 roberto Exp roberto $
+** $Id: lvm.c,v 2.281 2017/05/13 12:57:20 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -659,7 +659,7 @@ static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,
 */
 void luaV_finishOp (lua_State *L) {
   CallInfo *ci = L->ci;
-  StkId base = ci->u.l.base;
+  StkId base = ci->func + 1;
   Instruction inst = *(ci->u.l.savedpc - 1);  /* interrupted instruction */
   OpCode op = GET_OPCODE(inst);
   switch (op) {  /* finish its execution */
@@ -696,7 +696,7 @@ void luaV_finishOp (lua_State *L) {
         luaV_concat(L, total);  /* concat them (may yield again) */
       }
       /* move final result to final position */
-      setobj2s(L, ci->u.l.base + GETARG_A(inst), L->top - 1);
+      setobj2s(L, ci->func + 1 + GETARG_A(inst), L->top - 1);
       L->top = ci->top;  /* restore top */
       break;
     }
@@ -753,7 +753,7 @@ void luaV_finishOp (lua_State *L) {
 */
 #define dojump(ci,i,e) \
   { int a = GETARG_A(i); \
-    if (a != 0) luaF_close(L, ci->u.l.base + a - 1); \
+    if (a != 0) luaF_close(L, ci->func + a); \
     pc += GETARG_sBx(i) + e; updatemask(L); }
 
 
@@ -772,7 +772,7 @@ void luaV_finishOp (lua_State *L) {
 ** stack, and change the hooks.
 */
 #define Protect(code)  \
-  { savepc(L); {code;}; base = ci->u.l.base; updatemask(L); }
+  { savepc(L); {code;}; base = ci->func + 1; updatemask(L); }
 
 
 #define checkGC(L,c)  \
@@ -797,7 +797,7 @@ void luaV_execute (lua_State *L) {
   CallInfo *ci = L->ci;
   LClosure *cl;
   TValue *k;
-  StkId base;  /* local copy of 'ci->u.l.base' */
+  StkId base;  /* local copy of 'ci->func + 1' */
   int mask;  /* local copy of 'L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)' */
   const Instruction *pc;  /* local copy of 'ci->u.l.savedpc' */
   ci->callstatus |= CIST_FRESH;  /* fresh invocation of 'luaV_execute" */
@@ -806,14 +806,14 @@ void luaV_execute (lua_State *L) {
   cl = clLvalue(ci->func);  /* local reference to function's closure */
   k = cl->p->k;  /* local reference to function's constant table */
   updatemask(L);
-  base = ci->u.l.base;
+  base = ci->func + 1;
   pc = ci->u.l.savedpc;
   /* main loop of interpreter */
   for (;;) {
     Instruction i;
     StkId ra;
     vmfetch();
-    lua_assert(base == ci->u.l.base);
+    lua_assert(base == ci->func + 1);
     lua_assert(base <= L->top && L->top < L->stack + L->stacksize);
     vmdispatch (GET_OPCODE(i)) {
       vmcase(OP_MOVE) {
@@ -1288,19 +1288,18 @@ void luaV_execute (lua_State *L) {
           StkId nfunc = nci->func;  /* called function */
           StkId ofunc = oci->func;  /* caller function */
           /* last stack slot filled by 'precall' */
-          StkId lim = nci->u.l.base + getproto(nfunc)->numparams;
+          StkId lim = nci->func + 1 + getproto(nfunc)->numparams;
           int aux;
           /* close all upvalues from previous call */
-          if (cl->p->sizep > 0) luaF_close(L, oci->u.l.base);
+          if (cl->p->sizep > 0) luaF_close(L, oci->func + 1);
           /* move new frame into old one */
           for (aux = 0; nfunc + aux < lim; aux++)
             setobjs2s(L, ofunc + aux, nfunc + aux);
-          oci->u.l.base = ofunc + (nci->u.l.base - nfunc);  /* correct base */
           oci->top = L->top = ofunc + (L->top - nfunc);  /* correct top */
           oci->u.l.savedpc = nci->u.l.savedpc;
           oci->callstatus |= CIST_TAIL;  /* function was tail called */
           ci = L->ci = oci;  /* remove new frame */
-          lua_assert(L->top == oci->u.l.base + getproto(ofunc)->maxstacksize);
+          lua_assert(L->top == oci->func + 1 + getproto(ofunc)->maxstacksize);
           goto newframe;  /* restart luaV_execute over new Lua function */
         }
         vmbreak;