Upgrading to Lua-5.1.2

1 files changed, 397 insertions, 432 deletions

diff --git a/lib/lua/src/lvm.c b/lib/lua/src/lvm.c
index 5103140..52f65e6 100644
--- a/lib/lua/src/lvm.c
+++ b/lib/lua/src/lvm.c
@@ -1,18 +1,16 @@
 /*
-** $Id: lvm.c,v 1.10 2007-07-25 16:54:32 pixel Exp $
+** $Id: lvm.c,v 1.11 2007-07-27 10:05:54 pixel Exp $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
 
 
-#include <stdarg.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-/* needed only when `lua_number2str' uses `sprintf' */
-#include <stdio.h>
-
 #define lvm_c
+#define LUA_CORE
 
 #include "lua.h"
 
@@ -30,17 +28,11 @@
 
 
 
-/* function to convert a lua_Number to a string */
-#ifndef lua_number2str
-#define lua_number2str(s,n)     sprintf((s), LUA_NUMBER_FMT, (n))
-#endif
-
-
 /* limit for table tag-method chains (to avoid loops) */
 #define MAXTAGLOOP	100
 
 
-const TObject *luaV_tonumber (const TObject *obj, TObject *n) {
+const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
   lua_Number num;
   if (ttisnumber(obj)) return obj;
   if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
@@ -53,149 +45,105 @@ const TObject *luaV_tonumber (const TObject *obj, TObject *n) {
 
 
 int luaV_tostring (lua_State *L, StkId obj) {
-#if 0
   if (!ttisnumber(obj))
     return 0;
   else {
-    char s[32];  /* 16 digits, sign, point and \0  (+ some extra...) */
-    lua_number2str(s, nvalue(obj));
-    setsvalue2s(obj, luaS_new(L, s));
+    char s[LUAI_MAXNUMBER2STR];
+    lua_Number n = nvalue(obj);
+    lua_number2str(s, n);
+    setsvalue2s(L, obj, luaS_new(L, s));
     return 1;
   }
-#else
-  if (ttisnumber(obj)) {
-    char s[32];  /* 16 digits, sign, point and \0  (+ some extra...) */
-    lua_number2str(s, nvalue(obj));
-    setsvalue2s(obj, luaS_new(L, s));
-    return 1;
-  } else if (ttisboolean(obj)) {
-    if (bvalue(obj))
-      setsvalue2s(obj, luaS_new(L, "(true)"))
-    else
-      setsvalue2s(obj, luaS_new(L, "(false)"));
-    return 1;
-  } else if (ttisnil(obj)) {
-    setsvalue(obj, luaS_new(L, "(nil)"));
-    return 1;
-  } else {
-    return 0;
-  }
-#endif
 }
 
 
-static void traceexec (lua_State *L) {
+static void traceexec (lua_State *L, const Instruction *pc) {
   lu_byte mask = L->hookmask;
-  if (mask & LUA_MASKCOUNT) {  /* instruction-hook set? */
+  const Instruction *oldpc = L->savedpc;
+  L->savedpc = pc;
+  if (mask > LUA_MASKLINE) {  /* instruction-hook set? */
     if (L->hookcount == 0) {
       resethookcount(L);
       luaD_callhook(L, LUA_HOOKCOUNT, -1);
-      return;
     }
   }
   if (mask & LUA_MASKLINE) {
-    CallInfo *ci = L->ci;
-    Proto *p = ci_func(ci)->l.p;
-    int newline = getline(p, pcRel(*ci->u.l.pc, p));
-    if (!L->hookinit) {
-      luaG_inithooks(L);
-      return;
-    }
-    lua_assert(ci->state & CI_HASFRAME);
-    if (pcRel(*ci->u.l.pc, p) == 0)  /* tracing may be starting now? */
-      ci->u.l.savedpc = *ci->u.l.pc;  /* initialize `savedpc' */
-    /* calls linehook when enters a new line or jumps back (loop) */
-    if (*ci->u.l.pc <= ci->u.l.savedpc ||
-        newline != getline(p, pcRel(ci->u.l.savedpc, p))) {
+    Proto *p = ci_func(L->ci)->l.p;
+    int npc = pcRel(pc, p);
+    int newline = getline(p, npc);
+    /* call linehook when enter a new function, when jump back (loop),
+       or when enter a new line */
+    if (npc == 0 || pc <= oldpc || newline != getline(p, pcRel(oldpc, p)))
       luaD_callhook(L, LUA_HOOKLINE, newline);
-      ci = L->ci;  /* previous call may reallocate `ci' */
-    }
-    ci->u.l.savedpc = *ci->u.l.pc;
   }
 }
 
 
-static void callTMres (lua_State *L, const TObject *f,
-                       const TObject *p1, const TObject *p2) {
-  setobj2s(L->top, f);  /* push function */
-  setobj2s(L->top+1, p1);  /* 1st argument */
-  setobj2s(L->top+2, p2);  /* 2nd argument */
-  luaD_checkstack(L, 3);  /* cannot check before (could invalidate p1, p2) */
+static void callTMres (lua_State *L, StkId res, const TValue *f,
+                        const TValue *p1, const TValue *p2) {
+  ptrdiff_t result = savestack(L, res);
+  setobj2s(L, L->top, f);  /* push function */
+  setobj2s(L, L->top+1, p1);  /* 1st argument */
+  setobj2s(L, L->top+2, p2);  /* 2nd argument */
+  luaD_checkstack(L, 3);
   L->top += 3;
   luaD_call(L, L->top - 3, 1);
-  L->top--;  /* result will be in L->top */
+  res = restorestack(L, result);
+  L->top--;
+  setobjs2s(L, res, L->top);
 }
 
 
 
-static void callTM (lua_State *L, const TObject *f,
-                    const TObject *p1, const TObject *p2, const TObject *p3) {
-  setobj2s(L->top, f);  /* push function */
-  setobj2s(L->top+1, p1);  /* 1st argument */
-  setobj2s(L->top+2, p2);  /* 2nd argument */
-  setobj2s(L->top+3, p3);  /* 3th argument */
-  luaD_checkstack(L, 4);  /* cannot check before (could invalidate p1...p3) */
+static void callTM (lua_State *L, const TValue *f, const TValue *p1,
+                    const TValue *p2, const TValue *p3) {
+  setobj2s(L, L->top, f);  /* push function */
+  setobj2s(L, L->top+1, p1);  /* 1st argument */
+  setobj2s(L, L->top+2, p2);  /* 2nd argument */
+  setobj2s(L, L->top+3, p3);  /* 3th argument */
+  luaD_checkstack(L, 4);
   L->top += 4;
   luaD_call(L, L->top - 4, 0);
 }
 
 
-static const TObject *luaV_index (lua_State *L, const TObject *t,
-                                  TObject *key, int loop) {
-  const TObject *tm = fasttm(L, hvalue(t)->metatable, TM_INDEX);
-  if (tm == NULL) return &luaO_nilobject;  /* no TM */
-  if (ttisfunction(tm)) {
-    callTMres(L, tm, t, key);
-    return L->top;
-  }
-  else return luaV_gettable(L, tm, key, loop);
-}
-
-static const TObject *luaV_getnotable (lua_State *L, const TObject *t,
-                                       TObject *key, int loop) {
-  const TObject *tm = luaT_gettmbyobj(L, t, TM_INDEX);
-  if (ttisnil(tm))
-    luaG_typeerror(L, t, "index");
-  if (ttisfunction(tm)) {
-    callTMres(L, tm, t, key);
-    return L->top;
-  }
-  else return luaV_gettable(L, tm, key, loop);
-}
-
-
-/*
-** Function to index a table.
-** Receives the table at `t' and the key at `key'.
-** leaves the result at `res'.
-*/
-const TObject *luaV_gettable (lua_State *L, const TObject *t, TObject *key,
-                              int loop) {
-  if (loop > MAXTAGLOOP)
-    luaG_runerror(L, "loop in gettable");
-  if (ttistable(t)) {  /* `t' is a table? */
-    Table *h = hvalue(t);
-    const TObject *v = luaH_get(h, key);  /* do a primitive get */
-    if (!ttisnil(v)) return v;
-    else return luaV_index(L, t, key, loop+1);
+void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
+  int loop;
+  for (loop = 0; loop < MAXTAGLOOP; loop++) {
+    const TValue *tm;
+    if (ttistable(t)) {  /* `t' is a table? */
+      Table *h = hvalue(t);
+      const TValue *res = luaH_get(h, key); /* do a primitive get */
+      if (!ttisnil(res) ||  /* result is no nil? */
+          (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
+        setobj2s(L, val, res);
+        return;
+      }
+      /* else will try the tag method */
+    }
+    else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
+      luaG_typeerror(L, t, "index");
+    if (ttisfunction(tm)) {
+      callTMres(L, val, tm, t, key);
+      return;
+    }
+    t = tm;  /* else repeat with `tm' */ 
   }
-  else return luaV_getnotable(L, t, key, loop+1);
+  luaG_runerror(L, "loop in gettable");
 }
 
 
-/*
-** Receives table at `t', key at `key' and value at `val'.
-*/
-void luaV_settable (lua_State *L, const TObject *t, TObject *key, StkId val) {
-  const TObject *tm;
-  int loop = 0;
-  do {
+void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
+  int loop;
+  for (loop = 0; loop < MAXTAGLOOP; loop++) {
+    const TValue *tm;
     if (ttistable(t)) {  /* `t' is a table? */
       Table *h = hvalue(t);
-      TObject *oldval = luaH_set(L, h, key); /* do a primitive set */
+      TValue *oldval = luaH_set(L, h, key); /* do a primitive set */
       if (!ttisnil(oldval) ||  /* result is no nil? */
           (tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
-        setobj2t(oldval, val);  /* write barrier */
+        setobj2t(L, oldval, val);
+        luaC_barriert(L, h, val);
         return;
       }
       /* else will try the tag method */
@@ -207,29 +155,26 @@ void luaV_settable (lua_State *L, const TObject *t, TObject *key, StkId val) {
       return;
     }
     t = tm;  /* else repeat with `tm' */ 
-  } while (++loop <= MAXTAGLOOP);
+  }
   luaG_runerror(L, "loop in settable");
 }
 
 
-static int call_binTM (lua_State *L, const TObject *p1, const TObject *p2,
+static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
                        StkId res, TMS event) {
-  ptrdiff_t result = savestack(L, res);
-  const TObject *tm = luaT_gettmbyobj(L, p1, event);  /* try first operand */
+  const TValue *tm = luaT_gettmbyobj(L, p1, event);  /* try first operand */
   if (ttisnil(tm))
     tm = luaT_gettmbyobj(L, p2, event);  /* try second operand */
-  if (!ttisfunction(tm)) return 0;
-  callTMres(L, tm, p1, p2);
-  res = restorestack(L, result);  /* previous call may change stack */
-  setobjs2s(res, L->top);
+  if (ttisnil(tm)) return 0;
+  callTMres(L, res, tm, p1, p2);
   return 1;
 }
 
 
-static const TObject *get_compTM (lua_State *L, Table *mt1, Table *mt2,
+static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
                                   TMS event) {
-  const TObject *tm1 = fasttm(L, mt1, event);
-  const TObject *tm2;
+  const TValue *tm1 = fasttm(L, mt1, event);
+  const TValue *tm2;
   if (tm1 == NULL) return NULL;  /* no metamethod */
   if (mt1 == mt2) return tm1;  /* same metatables => same metamethods */
   tm2 = fasttm(L, mt2, event);
@@ -240,20 +185,20 @@ static const TObject *get_compTM (lua_State *L, Table *mt1, Table *mt2,
 }
 
 
-static int call_orderTM (lua_State *L, const TObject *p1, const TObject *p2,
+static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
                          TMS event) {
-  const TObject *tm1 = luaT_gettmbyobj(L, p1, event);
-  const TObject *tm2;
+  const TValue *tm1 = luaT_gettmbyobj(L, p1, event);
+  const TValue *tm2;
   if (ttisnil(tm1)) return -1;  /* no metamethod? */
   tm2 = luaT_gettmbyobj(L, p2, event);
   if (!luaO_rawequalObj(tm1, tm2))  /* different metamethods? */
     return -1;
-  callTMres(L, tm1, p1, p2);
+  callTMres(L, L->top, tm1, p1, p2);
   return !l_isfalse(L->top);
 }
 
 
-static int luaV_strcmp (const TString *ls, const TString *rs) {
+static int l_strcmp (const TString *ls, const TString *rs) {
   const char *l = getstr(ls);
   size_t ll = ls->tsv.len;
   const char *r = getstr(rs);
@@ -275,28 +220,28 @@ static int luaV_strcmp (const TString *ls, const TString *rs) {
 }
 
 
-int luaV_lessthan (lua_State *L, const TObject *l, const TObject *r) {
+int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
   int res;
   if (ttype(l) != ttype(r))
     return luaG_ordererror(L, l, r);
   else if (ttisnumber(l))
-    return nvalue(l) < nvalue(r);
+    return luai_numlt(nvalue(l), nvalue(r));
   else if (ttisstring(l))
-    return luaV_strcmp(tsvalue(l), tsvalue(r)) < 0;
+    return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
   else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
     return res;
   return luaG_ordererror(L, l, r);
 }
 
 
-static int luaV_lessequal (lua_State *L, const TObject *l, const TObject *r) {
+static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
   int res;
   if (ttype(l) != ttype(r))
     return luaG_ordererror(L, l, r);
   else if (ttisnumber(l))
-    return nvalue(l) <= nvalue(r);
+    return luai_numle(nvalue(l), nvalue(r));
   else if (ttisstring(l))
-    return luaV_strcmp(tsvalue(l), tsvalue(r)) <= 0;
+    return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
   else if ((res = call_orderTM(L, l, r, TM_LE)) != -1)  /* first try `le' */
     return res;
   else if ((res = call_orderTM(L, r, l, TM_LT)) != -1)  /* else try `lt' */
@@ -305,17 +250,17 @@ static int luaV_lessequal (lua_State *L, const TObject *l, const TObject *r) {
 }
 
 
-int luaV_equalval (lua_State *L, const TObject *t1, const TObject *t2) {
-  const TObject *tm;
+int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
+  const TValue *tm;
   lua_assert(ttype(t1) == ttype(t2));
   switch (ttype(t1)) {
     case LUA_TNIL: return 1;
-    case LUA_TNUMBER: return nvalue(t1) == nvalue(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_TUSERDATA: {
       if (uvalue(t1) == uvalue(t2)) return 1;
-      tm = get_compTM(L, uvalue(t1)->uv.metatable, uvalue(t2)->uv.metatable,
+      tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
                          TM_EQ);
       break;  /* will try TM */
     }
@@ -327,7 +272,7 @@ int luaV_equalval (lua_State *L, const TObject *t1, const TObject *t2) {
     default: return gcvalue(t1) == gcvalue(t2);
   }
   if (tm == NULL) return 0;  /* no TM? */
-  callTMres(L, tm, t1, t2);  /* call TM */
+  callTMres(L, L->top, tm, t1, t2);  /* call TM */
   return !l_isfalse(L->top);
 }
 
@@ -336,28 +281,30 @@ void luaV_concat (lua_State *L, int total, int last) {
   do {
     StkId top = L->base + last + 1;
     int n = 2;  /* number of elements handled in this pass (at least 2) */
-    if (!tostring(L, top-2) || !tostring(L, top-1)) {
+    if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
       if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
         luaG_concaterror(L, top-2, top-1);
-    } else if (tsvalue(top-1)->tsv.len > 0) {  /* if len=0, do nothing */
+    } else if (tsvalue(top-1)->len == 0)  /* second op is empty? */
+      (void)tostring(L, top - 2);  /* result is first op (as string) */
+    else {
       /* at least two string values; get as many as possible */
-      size_t tl = tsvalue(top-1)->tsv.len;
+      size_t tl = tsvalue(top-1)->len;
       char *buffer;
       int i;
       /* collect total length */
       for (n = 1; n < total && tostring(L, top-n-1); n++) {
-        size_t l = tsvalue(top-n-1)->tsv.len;
+        size_t l = tsvalue(top-n-1)->len;
         if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
         tl += l;
       }
       buffer = luaZ_openspace(L, &G(L)->buff, tl);
       tl = 0;
       for (i=n; i>0; i--) {  /* concat all strings */
-        size_t l = tsvalue(top-i)->tsv.len;
+        size_t l = tsvalue(top-i)->len;
         memcpy(buffer+tl, svalue(top-i), l);
         tl += l;
       }
-      setsvalue2s(top-n, luaS_newlstr(L, buffer, tl));
+      setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
     }
     total -= n-1;  /* got `n' strings to create 1 new */
     last -= n-1;
@@ -365,27 +312,21 @@ void luaV_concat (lua_State *L, int total, int last) {
 }
 
 
-static void Arith (lua_State *L, StkId ra,
-                   const TObject *rb, const TObject *rc, TMS op) {
-  TObject tempb, tempc;
-  const TObject *b, *c;
+static void Arith (lua_State *L, StkId ra, const TValue *rb,
+                   const TValue *rc, TMS op) {
+  TValue tempb, tempc;
+  const TValue *b, *c;
   if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
       (c = luaV_tonumber(rc, &tempc)) != NULL) {
+    lua_Number nb = nvalue(b), nc = nvalue(c);
     switch (op) {
-      case TM_ADD: setnvalue(ra, nvalue(b) + nvalue(c)); break;
-      case TM_SUB: setnvalue(ra, nvalue(b) - nvalue(c)); break;
-      case TM_MUL: setnvalue(ra, nvalue(b) * nvalue(c)); break;
-      case TM_DIV: setnvalue(ra, nvalue(b) / nvalue(c)); break;
-      case TM_POW: {
-        const TObject *f = luaH_getstr(hvalue(gt(L)), G(L)->tmname[TM_POW]);
-        ptrdiff_t res = savestack(L, ra);
-        if (!ttisfunction(f))
-          luaG_runerror(L, "`__pow' (`^' operator) is not a function");
-        callTMres(L, f, b, c);
-        ra = restorestack(L, res);  /* previous call may change stack */
-        setobjs2s(ra, L->top);
-        break;
-      }
+      case TM_ADD: setnvalue(ra, luai_numadd(nb, nc)); break;
+      case TM_SUB: setnvalue(ra, luai_numsub(nb, nc)); break;
+      case TM_MUL: setnvalue(ra, luai_nummul(nb, nc)); break;
+      case TM_DIV: setnvalue(ra, luai_numdiv(nb, nc)); break;
+      case TM_MOD: setnvalue(ra, luai_nummod(nb, nc)); break;
+      case TM_POW: setnvalue(ra, luai_numpow(nb, nc)); break;
+      case TM_UNM: setnvalue(ra, luai_numunm(nb)); break;
       default: lua_assert(0); break;
     }
   }
@@ -399,384 +340,387 @@ static void Arith (lua_State *L, StkId ra,
 ** some macros for common tasks in `luaV_execute'
 */
 
-#define runtime_check(L, c)	{ if (!(c)) return 0; }
+#define runtime_check(L, c)	{ if (!(c)) break; }
 
 #define RA(i)	(base+GETARG_A(i))
 /* to be used after possible stack reallocation */
-#define XRA(i)	(L->base+GETARG_A(i))
-#define RB(i)	(base+GETARG_B(i))
-#define RKB(i)	((GETARG_B(i) < MAXSTACK) ? RB(i) : k+GETARG_B(i)-MAXSTACK)
-#define RC(i)	(base+GETARG_C(i))
-#define RKC(i)	((GETARG_C(i) < MAXSTACK) ? RC(i) : k+GETARG_C(i)-MAXSTACK)
-#define KBx(i)	(k+GETARG_Bx(i))
+#define RB(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))
+#define RC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
+#define RKB(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
+	ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))
+#define RKC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
+	ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))
+#define KBx(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgK, k+GETARG_Bx(i))
+
+
+#define dojump(L,pc,i)	{(pc) += (i); luai_threadyield(L);}
 
 
-#define dojump(pc, i)	((pc) += (i))
+#define Protect(x)	{ L->savedpc = pc; {x;}; base = L->base; }
 
 
-StkId luaV_execute (lua_State *L) {
+#define arith_op(op,tm) { \
+        TValue *rb = RKB(i); \
+        TValue *rc = RKC(i); \
+        if (ttisnumber(rb) && ttisnumber(rc)) { \
+          lua_Number nb = nvalue(rb), nc = nvalue(rc); \
+          setnvalue(ra, op(nb, nc)); \
+        } \
+        else \
+          Protect(Arith(L, ra, rb, rc, tm)); \
+      }
+
+
+
+void luaV_execute (lua_State *L, int nexeccalls) {
   LClosure *cl;
-  TObject *k;
+  StkId base;
+  TValue *k;
   const Instruction *pc;
- callentry:  /* entry point when calling new functions */
-  if (L->hookmask & LUA_MASKCALL) {
-    L->ci->u.l.pc = &pc;
-    luaD_callhook(L, LUA_HOOKCALL, -1);
-  }
- retentry:  /* entry point when returning to old functions */
-  L->ci->u.l.pc = &pc;
-  lua_assert(L->ci->state == CI_SAVEDPC ||
-             L->ci->state == (CI_SAVEDPC | CI_CALLING));
-  L->ci->state = CI_HASFRAME;  /* activate frame */
-  pc = L->ci->u.l.savedpc;
-  cl = &clvalue(L->base - 1)->l;
+ reentry:  /* entry point */
+  lua_assert(isLua(L->ci));
+  pc = L->savedpc;
+  cl = &clvalue(L->ci->func)->l;
+  base = L->base;
   k = cl->p->k;
   /* main loop of interpreter */
   for (;;) {
     const Instruction i = *pc++;
-    StkId base, ra;
+    StkId ra;
     if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
         (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
-      traceexec(L);
-      if (L->ci->state & CI_YIELD) {  /* did hook yield? */
-        L->ci->u.l.savedpc = pc - 1;
-        L->ci->state = CI_YIELD | CI_SAVEDPC;
-        return NULL;
-      }
-      if (L->ci->state & CI_BREAK) {  /* did hook break? */
-        L->ci->state &= ~CI_BREAK;
-        luaG_runerror(L, "breaking");
+      traceexec(L, pc);
+      if (L->status == LUA_YIELD) {  /* did hook yield? */
+        L->savedpc = pc - 1;
+        return;
       }
+      base = L->base;
+    }
+    if (L->do_break) {
+      L->do_break = 0;
+      luaG_runerror(L, "breaking");
     }
     /* warning!! several calls may realloc the stack and invalidate `ra' */
-    base = L->base;
     ra = RA(i);
-    lua_assert(L->ci->state & CI_HASFRAME);
-    lua_assert(base == L->ci->base);
-    lua_assert(L->top <= L->stack + L->stacksize && L->top >= base);
-    lua_assert(L->top == L->ci->top ||
-         GET_OPCODE(i) == OP_CALL ||   GET_OPCODE(i) == OP_TAILCALL ||
-         GET_OPCODE(i) == OP_RETURN || GET_OPCODE(i) == OP_SETLISTO);
+    lua_assert(base == L->base && L->base == L->ci->base);
+    lua_assert(base <= L->top && L->top <= L->stack + L->stacksize);
+    lua_assert(L->top == L->ci->top || luaG_checkopenop(i));
     switch (GET_OPCODE(i)) {
       case OP_MOVE: {
-        setobjs2s(ra, RB(i));
-        break;
+        setobjs2s(L, ra, RB(i));
+        continue;
       }
       case OP_LOADK: {
-        setobj2s(ra, KBx(i));
-        break;
+        setobj2s(L, ra, KBx(i));
+        continue;
       }
       case OP_LOADBOOL: {
         setbvalue(ra, GETARG_B(i));
         if (GETARG_C(i)) pc++;  /* skip next instruction (if C) */
-        break;
+        continue;
       }
       case OP_LOADNIL: {
-        TObject *rb = RB(i);
+        TValue *rb = RB(i);
         do {
           setnilvalue(rb--);
         } while (rb >= ra);
-        break;
+        continue;
       }
       case OP_GETUPVAL: {
         int b = GETARG_B(i);
-        setobj2s(ra, cl->upvals[b]->v);
-        break;
+        setobj2s(L, ra, cl->upvals[b]->v);
+        continue;
       }
       case OP_GETGLOBAL: {
-        TObject *rb = KBx(i);
-        const TObject *v;
-        lua_assert(ttisstring(rb) && ttistable(&cl->g));
-        v = luaH_getstr(hvalue(&cl->g), tsvalue(rb));
-        if (!ttisnil(v)) { setobj2s(ra, v); }
-        else
-          setobj2s(XRA(i), luaV_index(L, &cl->g, rb, 0));
-        break;
+        TValue g;
+        TValue *rb = KBx(i);
+        sethvalue(L, &g, cl->env);
+        lua_assert(ttisstring(rb));
+        Protect(luaV_gettable(L, &g, rb, ra));
+        continue;
       }
       case OP_GETTABLE: {
-        StkId rb = RB(i);
-        TObject *rc = RKC(i);
-        if (ttistable(rb)) {
-          const TObject *v = luaH_get(hvalue(rb), rc);
-          if (!ttisnil(v)) { setobj2s(ra, v); }
-          else
-            setobj2s(XRA(i), luaV_index(L, rb, rc, 0));
-        }
-        else
-          setobj2s(XRA(i), luaV_getnotable(L, rb, rc, 0));
-        break;
+        Protect(luaV_gettable(L, RB(i), RKC(i), ra));
+        continue;
       }
       case OP_SETGLOBAL: {
-        lua_assert(ttisstring(KBx(i)) && ttistable(&cl->g));
-        luaV_settable(L, &cl->g, KBx(i), ra);
-        break;
+        TValue g;
+        sethvalue(L, &g, cl->env);
+        lua_assert(ttisstring(KBx(i)));
+        Protect(luaV_settable(L, &g, KBx(i), ra));
+        continue;
       }
       case OP_SETUPVAL: {
-        int b = GETARG_B(i);
-        setobj(cl->upvals[b]->v, ra);  /* write barrier */
-        break;
+        UpVal *uv = cl->upvals[GETARG_B(i)];
+        setobj(L, uv->v, ra);
+        luaC_barrier(L, uv, ra);
+        continue;
       }
       case OP_SETTABLE: {
-        luaV_settable(L, ra, RKB(i), RKC(i));
-        break;
+        Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
+        continue;
       }
       case OP_NEWTABLE: {
         int b = GETARG_B(i);
-        b = fb2int(b);
-        sethvalue(ra, luaH_new(L, b, GETARG_C(i)));
-        luaC_checkGC(L);
-        break;
+        int c = GETARG_C(i);
+        sethvalue(L, ra, luaH_new(L, luaO_fb2int(b), luaO_fb2int(c)));
+        Protect(luaC_checkGC(L));
+        continue;
       }
       case OP_SELF: {
         StkId rb = RB(i);
-        TObject *rc = RKC(i);
-        runtime_check(L, ttisstring(rc));
-        setobjs2s(ra+1, rb);
-        if (ttistable(rb)) {
-          const TObject *v = luaH_getstr(hvalue(rb), tsvalue(rc));
-          if (!ttisnil(v)) { setobj2s(ra, v); }
-          else
-            setobj2s(XRA(i), luaV_index(L, rb, rc, 0));
-        }
-        else
-          setobj2s(XRA(i), luaV_getnotable(L, rb, rc, 0));
-        break;
+        setobjs2s(L, ra+1, rb);
+        Protect(luaV_gettable(L, rb, RKC(i), ra));
+        continue;
       }
       case OP_ADD: {
-        TObject *rb = RKB(i);
-        TObject *rc = RKC(i);
-        if (ttisnumber(rb) && ttisnumber(rc)) {
-          setnvalue(ra, nvalue(rb) + nvalue(rc));
-        }
-        else
-          Arith(L, ra, rb, rc, TM_ADD);
-        break;
+        arith_op(luai_numadd, TM_ADD);
+        continue;
       }
       case OP_SUB: {
-        TObject *rb = RKB(i);
-        TObject *rc = RKC(i);
-        if (ttisnumber(rb) && ttisnumber(rc)) {
-          setnvalue(ra, nvalue(rb) - nvalue(rc));
-        }
-        else
-          Arith(L, ra, rb, rc, TM_SUB);
-        break;
+        arith_op(luai_numsub, TM_SUB);
+        continue;
       }
       case OP_MUL: {
-        TObject *rb = RKB(i);
-        TObject *rc = RKC(i);
-        if (ttisnumber(rb) && ttisnumber(rc)) {
-          setnvalue(ra, nvalue(rb) * nvalue(rc));
-        }
-        else
-          Arith(L, ra, rb, rc, TM_MUL);
-        break;
+        arith_op(luai_nummul, TM_MUL);
+        continue;
       }
       case OP_DIV: {
-        TObject *rb = RKB(i);
-        TObject *rc = RKC(i);
-        if (ttisnumber(rb) && ttisnumber(rc)) {
-          setnvalue(ra, nvalue(rb) / nvalue(rc));
-        }
-        else
-          Arith(L, ra, rb, rc, TM_DIV);
-        break;
+        arith_op(luai_numdiv, TM_DIV);
+        continue;
+      }
+      case OP_MOD: {
+        arith_op(luai_nummod, TM_MOD);
+        continue;
       }
       case OP_POW: {
-        Arith(L, ra, RKB(i), RKC(i), TM_POW);
-        break;
+        arith_op(luai_numpow, TM_POW);
+        continue;
       }
       case OP_UNM: {
-        const TObject *rb = RB(i);
-        TObject temp;
-        if (tonumber(rb, &temp)) {
-          setnvalue(ra, -nvalue(rb));
+        TValue *rb = RB(i);
+        if (ttisnumber(rb)) {
+          lua_Number nb = nvalue(rb);
+          setnvalue(ra, luai_numunm(nb));
         }
         else {
-          setnilvalue(&temp);
-          if (!call_binTM(L, RB(i), &temp, ra, TM_UNM))
-            luaG_aritherror(L, RB(i), &temp);
+          Protect(Arith(L, ra, rb, rb, TM_UNM));
         }
-        break;
+        continue;
       }
       case OP_NOT: {
         int res = l_isfalse(RB(i));  /* next assignment may change this value */
         setbvalue(ra, res);
-        break;
+        continue;
+      }
+      case OP_LEN: {
+        const TValue *rb = RB(i);
+        switch (ttype(rb)) {
+          case LUA_TTABLE: {
+            setnvalue(ra, cast_num(luaH_getn(hvalue(rb))));
+            break;
+          }
+          case LUA_TSTRING: {
+            setnvalue(ra, cast_num(tsvalue(rb)->len));
+            break;
+          }
+          default: {  /* try metamethod */
+            Protect(
+              if (!call_binTM(L, rb, luaO_nilobject, ra, TM_LEN))
+                luaG_typeerror(L, rb, "get length of");
+            )
+          }
+        }
+        continue;
       }
       case OP_CONCAT: {
         int b = GETARG_B(i);
         int c = GETARG_C(i);
-        luaV_concat(L, c-b+1, c);  /* may change `base' (and `ra') */
-        base = L->base;
-        setobjs2s(RA(i), base+b);
-        luaC_checkGC(L);
-        break;
+        Protect(luaV_concat(L, c-b+1, c); luaC_checkGC(L));
+        setobjs2s(L, RA(i), base+b);
+        continue;
       }
       case OP_JMP: {
-        dojump(pc, GETARG_sBx(i));
-        break;
+        dojump(L, pc, GETARG_sBx(i));
+        continue;
       }
       case OP_EQ: {
-        if (equalobj(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
-        else dojump(pc, GETARG_sBx(*pc) + 1);
-        break;
+        TValue *rb = RKB(i);
+        TValue *rc = RKC(i);
+        Protect(
+          if (equalobj(L, rb, rc) == GETARG_A(i))
+            dojump(L, pc, GETARG_sBx(*pc));
+        )
+        pc++;
+        continue;
       }
       case OP_LT: {
-        if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
-        else dojump(pc, GETARG_sBx(*pc) + 1);
-        break;
+        Protect(
+          if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
+            dojump(L, pc, GETARG_sBx(*pc));
+        )
+        pc++;
+        continue;
       }
       case OP_LE: {
-        if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
-        else dojump(pc, GETARG_sBx(*pc) + 1);
-        break;
+        Protect(
+          if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
+            dojump(L, pc, GETARG_sBx(*pc));
+        )
+        pc++;
+        continue;
       }
       case OP_TEST: {
-        TObject *rb = RB(i);
-        if (l_isfalse(rb) == GETARG_C(i)) pc++;
-        else {
-          setobjs2s(ra, rb);
-          dojump(pc, GETARG_sBx(*pc) + 1);
+        if (l_isfalse(ra) != GETARG_C(i))
+          dojump(L, pc, GETARG_sBx(*pc));
+        pc++;
+        continue;
+      }
+      case OP_TESTSET: {
+        TValue *rb = RB(i);
+        if (l_isfalse(rb) != GETARG_C(i)) {
+          setobjs2s(L, ra, rb);
+          dojump(L, pc, GETARG_sBx(*pc));
         }
-        break;
+        pc++;
+        continue;
       }
-      case OP_CALL:
-      case OP_TAILCALL: {
-        StkId firstResult;
+      case OP_CALL: {
         int b = GETARG_B(i);
-        int nresults;
+        int nresults = GETARG_C(i) - 1;
         if (b != 0) L->top = ra+b;  /* else previous instruction set top */
-        nresults = GETARG_C(i) - 1;
-        firstResult = luaD_precall(L, ra);
-        if (firstResult) {
-          if (firstResult > L->top) {  /* yield? */
-            lua_assert(L->ci->state == (CI_C | CI_YIELD));
-            (L->ci - 1)->u.l.savedpc = pc;
-            (L->ci - 1)->state = CI_SAVEDPC;
-            return NULL;
+        L->savedpc = pc;
+        switch (luaD_precall(L, ra, nresults)) {
+          case PCRLUA: {
+            nexeccalls++;
+            goto reentry;  /* restart luaV_execute over new Lua function */
           }
-          /* it was a C function (`precall' called it); adjust results */
-          luaD_poscall(L, nresults, firstResult);
-          if (nresults >= 0) L->top = L->ci->top;
-        }
-        else {  /* it is a Lua function */
-          if (GET_OPCODE(i) == OP_CALL) {  /* regular call? */
-            (L->ci-1)->u.l.savedpc = pc;  /* save `pc' to return later */
-            (L->ci-1)->state = (CI_SAVEDPC | CI_CALLING);
+          case PCRC: {
+            /* it was a C function (`precall' called it); adjust results */
+            if (nresults >= 0) L->top = L->ci->top;
+            base = L->base;
+            continue;
           }
-          else {  /* tail call: put new frame in place of previous one */
+          default: {
+            return;  /* yield */
+          }
+        }
+      }
+      case OP_TAILCALL: {
+        int b = GETARG_B(i);
+        if (b != 0) L->top = ra+b;  /* else previous instruction set top */
+        L->savedpc = pc;
+        lua_assert(GETARG_C(i) - 1 == LUA_MULTRET);
+        switch (luaD_precall(L, ra, LUA_MULTRET)) {
+          case PCRLUA: {
+            /* tail call: put new frame in place of previous one */
+            CallInfo *ci = L->ci - 1;  /* previous frame */
             int aux;
-            base = (L->ci - 1)->base;  /* `luaD_precall' may change the stack */
-            ra = RA(i);
-            if (L->openupval) luaF_close(L, base);
-            for (aux = 0; ra+aux < L->top; aux++)  /* move frame down */
-              setobjs2s(base+aux-1, ra+aux);
-            (L->ci - 1)->top = L->top = base+aux;  /* correct top */
-            lua_assert(L->ci->state & CI_SAVEDPC);
-            (L->ci - 1)->u.l.savedpc = L->ci->u.l.savedpc;
-            (L->ci - 1)->u.l.tailcalls++;  /* one more call lost */
-            (L->ci - 1)->state = CI_SAVEDPC;
+            StkId func = ci->func;
+            StkId pfunc = (ci+1)->func;  /* previous function index */
+            if (L->openupval) luaF_close(L, ci->base);
+            L->base = ci->base = ci->func + ((ci+1)->base - pfunc);
+            for (aux = 0; pfunc+aux < L->top; aux++)  /* move frame down */
+              setobjs2s(L, func+aux, pfunc+aux);
+            ci->top = L->top = func+aux;  /* correct top */
+            lua_assert(L->top == L->base + clvalue(func)->l.p->maxstacksize);
+            ci->savedpc = L->savedpc;
+            ci->tailcalls++;  /* one more call lost */
             L->ci--;  /* remove new frame */
-            L->base = L->ci->base;
+            goto reentry;
+          }
+          case PCRC: {  /* it was a C function (`precall' called it) */
+            base = L->base;
+            continue;
+          }
+          default: {
+            return;  /* yield */
           }
-          goto callentry;
         }
-        break;
       }
       case OP_RETURN: {
-        CallInfo *ci = L->ci - 1;  /* previous function frame */
         int b = GETARG_B(i);
         if (b != 0) L->top = ra+b-1;
-        lua_assert(L->ci->state & CI_HASFRAME);
         if (L->openupval) luaF_close(L, base);
-        L->ci->state = CI_SAVEDPC;  /* deactivate current function */
-        L->ci->u.l.savedpc = pc;
-        /* previous function was running `here'? */
-        if (!(ci->state & CI_CALLING)) {
-          lua_assert((ci->state & CI_C) || ci->u.l.pc != &pc);
-          return ra;  /* no: return */
-        }
+        L->savedpc = pc;
+        b = luaD_poscall(L, ra);
+        if (--nexeccalls == 0)  /* was previous function running `here'? */
+          return;  /* no: return */
         else {  /* yes: continue its execution */
-          int nresults;
-          lua_assert(ttisfunction(ci->base - 1) && (ci->state & CI_SAVEDPC));
-          lua_assert(GET_OPCODE(*(ci->u.l.savedpc - 1)) == OP_CALL);
-          nresults = GETARG_C(*(ci->u.l.savedpc - 1)) - 1;
-          luaD_poscall(L, nresults, ra);
-          if (nresults >= 0) L->top = L->ci->top;
-          goto retentry;
+          if (b) L->top = L->ci->top;
+          lua_assert(isLua(L->ci));
+          lua_assert(GET_OPCODE(*((L->ci)->savedpc - 1)) == OP_CALL);
+          goto reentry;
         }
       }
       case OP_FORLOOP: {
-        lua_Number step, idx, limit;
-        const TObject *plimit = ra+1;
-        const TObject *pstep = ra+2;
-        if (!ttisnumber(ra))
-          luaG_runerror(L, "`for' initial value must be a number");
-        if (!tonumber(plimit, ra+1))
-          luaG_runerror(L, "`for' limit must be a number");
-        if (!tonumber(pstep, ra+2))
-          luaG_runerror(L, "`for' step must be a number");
-        step = nvalue(pstep);
-        idx = nvalue(ra) + step;  /* increment index */
-        limit = nvalue(plimit);
-        if (step > 0 ? idx <= limit : idx >= limit) {
-          dojump(pc, GETARG_sBx(i));  /* jump back */
-          chgnvalue(ra, idx);  /* update index */
+        lua_Number step = nvalue(ra+2);
+        lua_Number idx = luai_numadd(nvalue(ra), step); /* increment index */
+        lua_Number limit = nvalue(ra+1);
+        if (luai_numlt(0, step) ? luai_numle(idx, limit)
+                                : luai_numle(limit, idx)) {
+          dojump(L, pc, GETARG_sBx(i));  /* jump back */
+          setnvalue(ra, idx);  /* update internal index... */
+          setnvalue(ra+3, idx);  /* ...and external index */
         }
-        break;
+        continue;
+      }
+      case OP_FORPREP: {
+        const TValue *init = ra;
+        const TValue *plimit = ra+1;
+        const TValue *pstep = ra+2;
+        L->savedpc = pc;  /* next steps may throw errors */
+        if (!tonumber(init, ra))
+          luaG_runerror(L, LUA_QL("for") " initial value must be a number");
+        else if (!tonumber(plimit, ra+1))
+          luaG_runerror(L, LUA_QL("for") " limit must be a number");
+        else if (!tonumber(pstep, ra+2))
+          luaG_runerror(L, LUA_QL("for") " step must be a number");
+        setnvalue(ra, luai_numsub(nvalue(ra), nvalue(pstep)));
+        dojump(L, pc, GETARG_sBx(i));
+        continue;
       }
       case OP_TFORLOOP: {
-        int nvar = GETARG_C(i) + 1;
-        StkId cb = ra + nvar + 2;  /* call base */
-        setobjs2s(cb, ra);
-        setobjs2s(cb+1, ra+1);
-        setobjs2s(cb+2, ra+2);
+        StkId cb = ra + 3;  /* call base */
+        setobjs2s(L, cb+2, ra+2);
+        setobjs2s(L, cb+1, ra+1);
+        setobjs2s(L, cb, ra);
         L->top = cb+3;  /* func. + 2 args (state and index) */
-        luaD_call(L, cb, nvar);
+        Protect(luaD_call(L, cb, GETARG_C(i)));
         L->top = L->ci->top;
-        ra = XRA(i) + 2;  /* final position of first result */
-        cb = ra + nvar;
-        do {  /* move results to proper positions */
-          nvar--;
-          setobjs2s(ra+nvar, cb+nvar);
-        } while (nvar > 0);
-        if (ttisnil(ra))  /* break loop? */
-          pc++;  /* skip jump (break loop) */
-        else
-          dojump(pc, GETARG_sBx(*pc) + 1);  /* jump back */
-        break;
-      }
-      case OP_TFORPREP: {  /* for compatibility only */
-        if (ttistable(ra)) {
-          setobjs2s(ra+1, ra);
-          setobj2s(ra, luaH_getstr(hvalue(gt(L)), luaS_new(L, "next")));
+        cb = RA(i) + 3;  /* previous call may change the stack */
+        if (!ttisnil(cb)) {  /* continue loop? */
+          setobjs2s(L, cb-1, cb);  /* save control variable */
+          dojump(L, pc, GETARG_sBx(*pc));  /* jump back */
         }
-        dojump(pc, GETARG_sBx(i));
-        break;
+        pc++;
+        continue;
       }
-      case OP_SETLIST:
-      case OP_SETLISTO: {
-        int bc;
-        int n;
+      case OP_SETLIST: {
+        int n = GETARG_B(i);
+        int c = GETARG_C(i);
+        int last;
         Table *h;
+        if (n == 0) {
+          n = cast_int(L->top - ra) - 1;
+          L->top = L->ci->top;
+        }
+        if (c == 0) c = cast_int(*pc++);
         runtime_check(L, ttistable(ra));
         h = hvalue(ra);
-        bc = GETARG_Bx(i);
-        if (GET_OPCODE(i) == OP_SETLIST)
-          n = (bc&(LFIELDS_PER_FLUSH-1)) + 1;
-        else {
-          n = L->top - ra - 1;
-          L->top = L->ci->top;
+        last = ((c-1)*LFIELDS_PER_FLUSH) + n;
+        if (last > h->sizearray)  /* needs more space? */
+          luaH_resizearray(L, h, last);  /* pre-alloc it at once */
+        for (; n > 0; n--) {
+          TValue *val = ra+n;
+          setobj2t(L, luaH_setnum(L, h, last--), val);
+          luaC_barriert(L, h, val);
         }
-        bc &= ~(LFIELDS_PER_FLUSH-1);  /* bc = bc - bc%FPF */
-        for (; n > 0; n--)
-          setobj2t(luaH_setnum(L, h, bc+n), ra+n);  /* write barrier */
-        break;
+        continue;
       }
       case OP_CLOSE: {
         luaF_close(L, ra);
-        break;
+        continue;
       }
       case OP_CLOSURE: {
         Proto *p;
@@ -784,7 +728,7 @@ StkId luaV_execute (lua_State *L) {
         int nup, j;
         p = cl->p->p[GETARG_Bx(i)];
         nup = p->nups;
-        ncl = luaF_newLclosure(L, nup, &cl->g);
+        ncl = luaF_newLclosure(L, nup, cl->env);
         ncl->l.p = p;
         for (j=0; j<nup; j++, pc++) {
           if (GET_OPCODE(*pc) == OP_GETUPVAL)
@@ -794,9 +738,30 @@ StkId luaV_execute (lua_State *L) {
             ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
           }
         }
-        setclvalue(ra, ncl);
-        luaC_checkGC(L);
-        break;
+        setclvalue(L, ra, ncl);
+        Protect(luaC_checkGC(L));
+        continue;
+      }
+      case OP_VARARG: {
+        int b = GETARG_B(i) - 1;
+        int j;
+        CallInfo *ci = L->ci;
+        int n = cast_int(ci->base - ci->func) - cl->p->numparams - 1;
+        if (b == LUA_MULTRET) {
+          Protect(luaD_checkstack(L, n));
+          ra = RA(i);  /* previous call may change the stack */
+          b = n;
+          L->top = ra + n;
+        }
+        for (j = 0; j < b; j++) {
+          if (j < n) {
+            setobjs2s(L, ra + j, ci->base - n + j);
+          }
+          else {
+            setnilvalue(ra + j);
+          }
+        }
+        continue;
       }
     }
   }