rlm@1: /*
rlm@1: ** $Id: lvm.c,v 2.63.1.3 2007/12/28 15:32:23 roberto Exp $
rlm@1: ** Lua virtual machine
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: #include <stdio.h>
rlm@1: #include <stdlib.h>
rlm@1: #include <string.h>
rlm@1: 
rlm@1: #define lvm_c
rlm@1: #define LUA_CORE
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "ldebug.h"
rlm@1: #include "ldo.h"
rlm@1: #include "lfunc.h"
rlm@1: #include "lgc.h"
rlm@1: #include "lobject.h"
rlm@1: #include "lopcodes.h"
rlm@1: #include "lstate.h"
rlm@1: #include "lstring.h"
rlm@1: #include "ltable.h"
rlm@1: #include "ltm.h"
rlm@1: #include "lvm.h"
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /* limit for table tag-method chains (to avoid loops) */
rlm@1: #define MAXTAGLOOP	100
rlm@1: 
rlm@1: 
rlm@1: const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
rlm@1:   lua_Number num;
rlm@1:   if (ttisnumber(obj)) return obj;
rlm@1:   if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
rlm@1:     setnvalue(n, num);
rlm@1:     return n;
rlm@1:   }
rlm@1:   else
rlm@1:     return NULL;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: int luaV_tostring (lua_State *L, StkId obj) {
rlm@1:   if (!ttisnumber(obj))
rlm@1:     return 0;
rlm@1:   else {
rlm@1:     char s[LUAI_MAXNUMBER2STR];
rlm@1:     lua_Number n = nvalue(obj);
rlm@1:     lua_number2str(s, n);
rlm@1:     setsvalue2s(L, obj, luaS_new(L, s));
rlm@1:     return 1;
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void traceexec (lua_State *L, const Instruction *pc) {
rlm@1:   lu_byte mask = L->hookmask;
rlm@1:   const Instruction *oldpc = L->savedpc;
rlm@1:   L->savedpc = pc;
rlm@1:   if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
rlm@1:     resethookcount(L);
rlm@1:     luaD_callhook(L, LUA_HOOKCOUNT, -1);
rlm@1:   }
rlm@1:   if (mask & LUA_MASKLINE) {
rlm@1:     Proto *p = ci_func(L->ci)->l.p;
rlm@1:     int npc = pcRel(pc, p);
rlm@1:     int newline = getline(p, npc);
rlm@1:     /* call linehook when enter a new function, when jump back (loop),
rlm@1:        or when enter a new line */
rlm@1:     if (npc == 0 || pc <= oldpc || newline != getline(p, pcRel(oldpc, p)))
rlm@1:       luaD_callhook(L, LUA_HOOKLINE, newline);
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void callTMres (lua_State *L, StkId res, const TValue *f,
rlm@1:                         const TValue *p1, const TValue *p2) {
rlm@1:   ptrdiff_t result = savestack(L, res);
rlm@1:   setobj2s(L, L->top, f);  /* push function */
rlm@1:   setobj2s(L, L->top+1, p1);  /* 1st argument */
rlm@1:   setobj2s(L, L->top+2, p2);  /* 2nd argument */
rlm@1:   luaD_checkstack(L, 3);
rlm@1:   L->top += 3;
rlm@1:   luaD_call(L, L->top - 3, 1);
rlm@1:   res = restorestack(L, result);
rlm@1:   L->top--;
rlm@1:   setobjs2s(L, res, L->top);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: static void callTM (lua_State *L, const TValue *f, const TValue *p1,
rlm@1:                     const TValue *p2, const TValue *p3) {
rlm@1:   setobj2s(L, L->top, f);  /* push function */
rlm@1:   setobj2s(L, L->top+1, p1);  /* 1st argument */
rlm@1:   setobj2s(L, L->top+2, p2);  /* 2nd argument */
rlm@1:   setobj2s(L, L->top+3, p3);  /* 3th argument */
rlm@1:   luaD_checkstack(L, 4);
rlm@1:   L->top += 4;
rlm@1:   luaD_call(L, L->top - 4, 0);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
rlm@1:   int loop;
rlm@1:   for (loop = 0; loop < MAXTAGLOOP; loop++) {
rlm@1:     const TValue *tm;
rlm@1:     if (ttistable(t)) {  /* `t' is a table? */
rlm@1:       Table *h = hvalue(t);
rlm@1:       const TValue *res = luaH_get(h, key); /* do a primitive get */
rlm@1:       if (!ttisnil(res) ||  /* result is no nil? */
rlm@1:           (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
rlm@1:         setobj2s(L, val, res);
rlm@1:         return;
rlm@1:       }
rlm@1:       /* else will try the tag method */
rlm@1:     }
rlm@1:     else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
rlm@1:       luaG_typeerror(L, t, "index");
rlm@1:     if (ttisfunction(tm)) {
rlm@1:       callTMres(L, val, tm, t, key);
rlm@1:       return;
rlm@1:     }
rlm@1:     t = tm;  /* else repeat with `tm' */ 
rlm@1:   }
rlm@1:   luaG_runerror(L, "loop in gettable");
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
rlm@1:   int loop;
rlm@1:   for (loop = 0; loop < MAXTAGLOOP; loop++) {
rlm@1:     const TValue *tm;
rlm@1:     if (ttistable(t)) {  /* `t' is a table? */
rlm@1:       Table *h = hvalue(t);
rlm@1:       TValue *oldval = luaH_set(L, h, key); /* do a primitive set */
rlm@1:       if (!ttisnil(oldval) ||  /* result is no nil? */
rlm@1:           (tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
rlm@1:         setobj2t(L, oldval, val);
rlm@1:         luaC_barriert(L, h, val);
rlm@1:         return;
rlm@1:       }
rlm@1:       /* else will try the tag method */
rlm@1:     }
rlm@1:     else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
rlm@1:       luaG_typeerror(L, t, "index");
rlm@1:     if (ttisfunction(tm)) {
rlm@1:       callTM(L, tm, t, key, val);
rlm@1:       return;
rlm@1:     }
rlm@1:     t = tm;  /* else repeat with `tm' */ 
rlm@1:   }
rlm@1:   luaG_runerror(L, "loop in settable");
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
rlm@1:                        StkId res, TMS event) {
rlm@1:   const TValue *tm = luaT_gettmbyobj(L, p1, event);  /* try first operand */
rlm@1:   if (ttisnil(tm))
rlm@1:     tm = luaT_gettmbyobj(L, p2, event);  /* try second operand */
rlm@1:   if (ttisnil(tm)) return 0;
rlm@1:   callTMres(L, res, tm, p1, p2);
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
rlm@1:                                   TMS event) {
rlm@1:   const TValue *tm1 = fasttm(L, mt1, event);
rlm@1:   const TValue *tm2;
rlm@1:   if (tm1 == NULL) return NULL;  /* no metamethod */
rlm@1:   if (mt1 == mt2) return tm1;  /* same metatables => same metamethods */
rlm@1:   tm2 = fasttm(L, mt2, event);
rlm@1:   if (tm2 == NULL) return NULL;  /* no metamethod */
rlm@1:   if (luaO_rawequalObj(tm1, tm2))  /* same metamethods? */
rlm@1:     return tm1;
rlm@1:   return NULL;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
rlm@1:                          TMS event) {
rlm@1:   const TValue *tm1 = luaT_gettmbyobj(L, p1, event);
rlm@1:   const TValue *tm2;
rlm@1:   if (ttisnil(tm1)) return -1;  /* no metamethod? */
rlm@1:   tm2 = luaT_gettmbyobj(L, p2, event);
rlm@1:   if (!luaO_rawequalObj(tm1, tm2))  /* different metamethods? */
rlm@1:     return -1;
rlm@1:   callTMres(L, L->top, tm1, p1, p2);
rlm@1:   return !l_isfalse(L->top);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int l_strcmp (const TString *ls, const TString *rs) {
rlm@1:   const char *l = getstr(ls);
rlm@1:   size_t ll = ls->tsv.len;
rlm@1:   const char *r = getstr(rs);
rlm@1:   size_t lr = rs->tsv.len;
rlm@1:   for (;;) {
rlm@1:     int temp = strcoll(l, r);
rlm@1:     if (temp != 0) return temp;
rlm@1:     else {  /* strings are equal up to a `\0' */
rlm@1:       size_t len = strlen(l);  /* index of first `\0' in both strings */
rlm@1:       if (len == lr)  /* r is finished? */
rlm@1:         return (len == ll) ? 0 : 1;
rlm@1:       else if (len == ll)  /* l is finished? */
rlm@1:         return -1;  /* l is smaller than r (because r is not finished) */
rlm@1:       /* both strings longer than `len'; go on comparing (after the `\0') */
rlm@1:       len++;
rlm@1:       l += len; ll -= len; r += len; lr -= len;
rlm@1:     }
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
rlm@1:   int res;
rlm@1:   if (ttype(l) != ttype(r))
rlm@1:     return luaG_ordererror(L, l, r);
rlm@1:   else if (ttisnumber(l))
rlm@1:     return luai_numlt(nvalue(l), nvalue(r));
rlm@1:   else if (ttisstring(l))
rlm@1:     return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
rlm@1:   else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
rlm@1:     return res;
rlm@1:   return luaG_ordererror(L, l, r);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
rlm@1:   int res;
rlm@1:   if (ttype(l) != ttype(r))
rlm@1:     return luaG_ordererror(L, l, r);
rlm@1:   else if (ttisnumber(l))
rlm@1:     return luai_numle(nvalue(l), nvalue(r));
rlm@1:   else if (ttisstring(l))
rlm@1:     return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
rlm@1:   else if ((res = call_orderTM(L, l, r, TM_LE)) != -1)  /* first try `le' */
rlm@1:     return res;
rlm@1:   else if ((res = call_orderTM(L, r, l, TM_LT)) != -1)  /* else try `lt' */
rlm@1:     return !res;
rlm@1:   return luaG_ordererror(L, l, r);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
rlm@1:   const TValue *tm;
rlm@1:   lua_assert(ttype(t1) == ttype(t2));
rlm@1:   switch (ttype(t1)) {
rlm@1:     case LUA_TNIL: return 1;
rlm@1:     case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
rlm@1:     case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2);  /* true must be 1 !! */
rlm@1:     case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
rlm@1:     case LUA_TUSERDATA: {
rlm@1:       if (uvalue(t1) == uvalue(t2)) return 1;
rlm@1:       tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
rlm@1:                          TM_EQ);
rlm@1:       break;  /* will try TM */
rlm@1:     }
rlm@1:     case LUA_TTABLE: {
rlm@1:       if (hvalue(t1) == hvalue(t2)) return 1;
rlm@1:       tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
rlm@1:       break;  /* will try TM */
rlm@1:     }
rlm@1:     default: return gcvalue(t1) == gcvalue(t2);
rlm@1:   }
rlm@1:   if (tm == NULL) return 0;  /* no TM? */
rlm@1:   callTMres(L, L->top, tm, t1, t2);  /* call TM */
rlm@1:   return !l_isfalse(L->top);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: void luaV_concat (lua_State *L, int total, int last) {
rlm@1:   do {
rlm@1:     StkId top = L->base + last + 1;
rlm@1:     int n = 2;  /* number of elements handled in this pass (at least 2) */
rlm@1:     if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
rlm@1:       if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
rlm@1:         luaG_concaterror(L, top-2, top-1);
rlm@1:     } else if (tsvalue(top-1)->len == 0)  /* second op is empty? */
rlm@1:       (void)tostring(L, top - 2);  /* result is first op (as string) */
rlm@1:     else {
rlm@1:       /* at least two string values; get as many as possible */
rlm@1:       size_t tl = tsvalue(top-1)->len;
rlm@1:       char *buffer;
rlm@1:       int i;
rlm@1:       /* collect total length */
rlm@1:       for (n = 1; n < total && tostring(L, top-n-1); n++) {
rlm@1:         size_t l = tsvalue(top-n-1)->len;
rlm@1:         if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
rlm@1:         tl += l;
rlm@1:       }
rlm@1:       buffer = luaZ_openspace(L, &G(L)->buff, tl);
rlm@1:       tl = 0;
rlm@1:       for (i=n; i>0; i--) {  /* concat all strings */
rlm@1:         size_t l = tsvalue(top-i)->len;
rlm@1:         memcpy(buffer+tl, svalue(top-i), l);
rlm@1:         tl += l;
rlm@1:       }
rlm@1:       setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
rlm@1:     }
rlm@1:     total -= n-1;  /* got `n' strings to create 1 new */
rlm@1:     last -= n-1;
rlm@1:   } while (total > 1);  /* repeat until only 1 result left */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void Arith (lua_State *L, StkId ra, const TValue *rb,
rlm@1:                    const TValue *rc, TMS op) {
rlm@1:   TValue tempb, tempc;
rlm@1:   const TValue *b, *c;
rlm@1:   if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
rlm@1:       (c = luaV_tonumber(rc, &tempc)) != NULL) {
rlm@1:     lua_Number nb = nvalue(b), nc = nvalue(c);
rlm@1:     switch (op) {
rlm@1:       case TM_ADD: setnvalue(ra, luai_numadd(nb, nc)); break;
rlm@1:       case TM_SUB: setnvalue(ra, luai_numsub(nb, nc)); break;
rlm@1:       case TM_MUL: setnvalue(ra, luai_nummul(nb, nc)); break;
rlm@1:       case TM_DIV: setnvalue(ra, luai_numdiv(nb, nc)); break;
rlm@1:       case TM_MOD: setnvalue(ra, luai_nummod(nb, nc)); break;
rlm@1:       case TM_POW: setnvalue(ra, luai_numpow(nb, nc)); break;
rlm@1:       case TM_UNM: setnvalue(ra, luai_numunm(nb)); break;
rlm@1:       default: lua_assert(0); break;
rlm@1:     }
rlm@1:   }
rlm@1:   else if (!call_binTM(L, rb, rc, ra, op))
rlm@1:     luaG_aritherror(L, rb, rc);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** some macros for common tasks in `luaV_execute'
rlm@1: */
rlm@1: 
rlm@1: #define runtime_check(L, c)	{ if (!(c)) break; }
rlm@1: 
rlm@1: #define RA(i)	(base+GETARG_A(i))
rlm@1: /* to be used after possible stack reallocation */
rlm@1: #define RB(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))
rlm@1: #define RC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
rlm@1: #define RKB(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
rlm@1: 	ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))
rlm@1: #define RKC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
rlm@1: 	ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))
rlm@1: #define KBx(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgK, k+GETARG_Bx(i))
rlm@1: 
rlm@1: 
rlm@1: #define dojump(L,pc,i)	{(pc) += (i); luai_threadyield(L);}
rlm@1: 
rlm@1: 
rlm@1: #define Protect(x)	{ L->savedpc = pc; {x;}; base = L->base; }
rlm@1: 
rlm@1: 
rlm@1: #define arith_op(op,tm) { \
rlm@1:         TValue *rb = RKB(i); \
rlm@1:         TValue *rc = RKC(i); \
rlm@1:         if (ttisnumber(rb) && ttisnumber(rc)) { \
rlm@1:           lua_Number nb = nvalue(rb), nc = nvalue(rc); \
rlm@1:           setnvalue(ra, op(nb, nc)); \
rlm@1:         } \
rlm@1:         else \
rlm@1:           Protect(Arith(L, ra, rb, rc, tm)); \
rlm@1:       }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: void luaV_execute (lua_State *L, int nexeccalls) {
rlm@1:   LClosure *cl;
rlm@1:   StkId base;
rlm@1:   TValue *k;
rlm@1:   const Instruction *pc;
rlm@1:  reentry:  /* entry point */
rlm@1:   lua_assert(isLua(L->ci));
rlm@1:   pc = L->savedpc;
rlm@1:   cl = &clvalue(L->ci->func)->l;
rlm@1:   base = L->base;
rlm@1:   k = cl->p->k;
rlm@1:   /* main loop of interpreter */
rlm@1:   for (;;) {
rlm@1:     const Instruction i = *pc++;
rlm@1:     StkId ra;
rlm@1:     if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
rlm@1:         (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
rlm@1:       traceexec(L, pc);
rlm@1:       if (L->status == LUA_YIELD) {  /* did hook yield? */
rlm@1:         L->savedpc = pc - 1;
rlm@1:         return;
rlm@1:       }
rlm@1:       base = L->base;
rlm@1:     }
rlm@1:     /* warning!! several calls may realloc the stack and invalidate `ra' */
rlm@1:     ra = RA(i);
rlm@1:     lua_assert(base == L->base && L->base == L->ci->base);
rlm@1:     lua_assert(base <= L->top && L->top <= L->stack + L->stacksize);
rlm@1:     lua_assert(L->top == L->ci->top || luaG_checkopenop(i));
rlm@1:     switch (GET_OPCODE(i)) {
rlm@1:       case OP_MOVE: {
rlm@1:         setobjs2s(L, ra, RB(i));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_LOADK: {
rlm@1:         setobj2s(L, ra, KBx(i));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_LOADBOOL: {
rlm@1:         setbvalue(ra, GETARG_B(i));
rlm@1:         if (GETARG_C(i)) pc++;  /* skip next instruction (if C) */
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_LOADNIL: {
rlm@1:         TValue *rb = RB(i);
rlm@1:         do {
rlm@1:           setnilvalue(rb--);
rlm@1:         } while (rb >= ra);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_GETUPVAL: {
rlm@1:         int b = GETARG_B(i);
rlm@1:         setobj2s(L, ra, cl->upvals[b]->v);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_GETGLOBAL: {
rlm@1:         TValue g;
rlm@1:         TValue *rb = KBx(i);
rlm@1:         sethvalue(L, &g, cl->env);
rlm@1:         lua_assert(ttisstring(rb));
rlm@1:         Protect(luaV_gettable(L, &g, rb, ra));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_GETTABLE: {
rlm@1:         Protect(luaV_gettable(L, RB(i), RKC(i), ra));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_SETGLOBAL: {
rlm@1:         TValue g;
rlm@1:         sethvalue(L, &g, cl->env);
rlm@1:         lua_assert(ttisstring(KBx(i)));
rlm@1:         Protect(luaV_settable(L, &g, KBx(i), ra));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_SETUPVAL: {
rlm@1:         UpVal *uv = cl->upvals[GETARG_B(i)];
rlm@1:         setobj(L, uv->v, ra);
rlm@1:         luaC_barrier(L, uv, ra);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_SETTABLE: {
rlm@1:         Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_NEWTABLE: {
rlm@1:         int b = GETARG_B(i);
rlm@1:         int c = GETARG_C(i);
rlm@1:         sethvalue(L, ra, luaH_new(L, luaO_fb2int(b), luaO_fb2int(c)));
rlm@1:         Protect(luaC_checkGC(L));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_SELF: {
rlm@1:         StkId rb = RB(i);
rlm@1:         setobjs2s(L, ra+1, rb);
rlm@1:         Protect(luaV_gettable(L, rb, RKC(i), ra));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_ADD: {
rlm@1:         arith_op(luai_numadd, TM_ADD);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_SUB: {
rlm@1:         arith_op(luai_numsub, TM_SUB);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_MUL: {
rlm@1:         arith_op(luai_nummul, TM_MUL);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_DIV: {
rlm@1:         arith_op(luai_numdiv, TM_DIV);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_MOD: {
rlm@1:         arith_op(luai_nummod, TM_MOD);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_POW: {
rlm@1:         arith_op(luai_numpow, TM_POW);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_UNM: {
rlm@1:         TValue *rb = RB(i);
rlm@1:         if (ttisnumber(rb)) {
rlm@1:           lua_Number nb = nvalue(rb);
rlm@1:           setnvalue(ra, luai_numunm(nb));
rlm@1:         }
rlm@1:         else {
rlm@1:           Protect(Arith(L, ra, rb, rb, TM_UNM));
rlm@1:         }
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_NOT: {
rlm@1:         int res = l_isfalse(RB(i));  /* next assignment may change this value */
rlm@1:         setbvalue(ra, res);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_LEN: {
rlm@1:         const TValue *rb = RB(i);
rlm@1:         switch (ttype(rb)) {
rlm@1:           case LUA_TTABLE: {
rlm@1:             setnvalue(ra, cast_num(luaH_getn(hvalue(rb))));
rlm@1:             break;
rlm@1:           }
rlm@1:           case LUA_TSTRING: {
rlm@1:             setnvalue(ra, cast_num(tsvalue(rb)->len));
rlm@1:             break;
rlm@1:           }
rlm@1:           default: {  /* try metamethod */
rlm@1:             Protect(
rlm@1:               if (!call_binTM(L, rb, luaO_nilobject, ra, TM_LEN))
rlm@1:                 luaG_typeerror(L, rb, "get length of");
rlm@1:             )
rlm@1:           }
rlm@1:         }
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_CONCAT: {
rlm@1:         int b = GETARG_B(i);
rlm@1:         int c = GETARG_C(i);
rlm@1:         Protect(luaV_concat(L, c-b+1, c); luaC_checkGC(L));
rlm@1:         setobjs2s(L, RA(i), base+b);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_JMP: {
rlm@1:         dojump(L, pc, GETARG_sBx(i));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_EQ: {
rlm@1:         TValue *rb = RKB(i);
rlm@1:         TValue *rc = RKC(i);
rlm@1:         Protect(
rlm@1:           if (equalobj(L, rb, rc) == GETARG_A(i))
rlm@1:             dojump(L, pc, GETARG_sBx(*pc));
rlm@1:         )
rlm@1:         pc++;
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_LT: {
rlm@1:         Protect(
rlm@1:           if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
rlm@1:             dojump(L, pc, GETARG_sBx(*pc));
rlm@1:         )
rlm@1:         pc++;
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_LE: {
rlm@1:         Protect(
rlm@1:           if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
rlm@1:             dojump(L, pc, GETARG_sBx(*pc));
rlm@1:         )
rlm@1:         pc++;
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_TEST: {
rlm@1:         if (l_isfalse(ra) != GETARG_C(i))
rlm@1:           dojump(L, pc, GETARG_sBx(*pc));
rlm@1:         pc++;
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_TESTSET: {
rlm@1:         TValue *rb = RB(i);
rlm@1:         if (l_isfalse(rb) != GETARG_C(i)) {
rlm@1:           setobjs2s(L, ra, rb);
rlm@1:           dojump(L, pc, GETARG_sBx(*pc));
rlm@1:         }
rlm@1:         pc++;
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_CALL: {
rlm@1:         int b = GETARG_B(i);
rlm@1:         int nresults = GETARG_C(i) - 1;
rlm@1:         if (b != 0) L->top = ra+b;  /* else previous instruction set top */
rlm@1:         L->savedpc = pc;
rlm@1:         switch (luaD_precall(L, ra, nresults)) {
rlm@1:           case PCRLUA: {
rlm@1:             nexeccalls++;
rlm@1:             goto reentry;  /* restart luaV_execute over new Lua function */
rlm@1:           }
rlm@1:           case PCRC: {
rlm@1:             /* it was a C function (`precall' called it); adjust results */
rlm@1:             if (nresults >= 0) L->top = L->ci->top;
rlm@1:             base = L->base;
rlm@1:             continue;
rlm@1:           }
rlm@1:           default: {
rlm@1:             return;  /* yield */
rlm@1:           }
rlm@1:         }
rlm@1:       }
rlm@1:       case OP_TAILCALL: {
rlm@1:         int b = GETARG_B(i);
rlm@1:         if (b != 0) L->top = ra+b;  /* else previous instruction set top */
rlm@1:         L->savedpc = pc;
rlm@1:         lua_assert(GETARG_C(i) - 1 == LUA_MULTRET);
rlm@1:         switch (luaD_precall(L, ra, LUA_MULTRET)) {
rlm@1:           case PCRLUA: {
rlm@1:             /* tail call: put new frame in place of previous one */
rlm@1:             CallInfo *ci = L->ci - 1;  /* previous frame */
rlm@1:             int aux;
rlm@1:             StkId func = ci->func;
rlm@1:             StkId pfunc = (ci+1)->func;  /* previous function index */
rlm@1:             if (L->openupval) luaF_close(L, ci->base);
rlm@1:             L->base = ci->base = ci->func + ((ci+1)->base - pfunc);
rlm@1:             for (aux = 0; pfunc+aux < L->top; aux++)  /* move frame down */
rlm@1:               setobjs2s(L, func+aux, pfunc+aux);
rlm@1:             ci->top = L->top = func+aux;  /* correct top */
rlm@1:             lua_assert(L->top == L->base + clvalue(func)->l.p->maxstacksize);
rlm@1:             ci->savedpc = L->savedpc;
rlm@1:             ci->tailcalls++;  /* one more call lost */
rlm@1:             L->ci--;  /* remove new frame */
rlm@1:             goto reentry;
rlm@1:           }
rlm@1:           case PCRC: {  /* it was a C function (`precall' called it) */
rlm@1:             base = L->base;
rlm@1:             continue;
rlm@1:           }
rlm@1:           default: {
rlm@1:             return;  /* yield */
rlm@1:           }
rlm@1:         }
rlm@1:       }
rlm@1:       case OP_RETURN: {
rlm@1:         int b = GETARG_B(i);
rlm@1:         if (b != 0) L->top = ra+b-1;
rlm@1:         if (L->openupval) luaF_close(L, base);
rlm@1:         L->savedpc = pc;
rlm@1:         b = luaD_poscall(L, ra);
rlm@1:         if (--nexeccalls == 0)  /* was previous function running `here'? */
rlm@1:           return;  /* no: return */
rlm@1:         else {  /* yes: continue its execution */
rlm@1:           if (b) L->top = L->ci->top;
rlm@1:           lua_assert(isLua(L->ci));
rlm@1:           lua_assert(GET_OPCODE(*((L->ci)->savedpc - 1)) == OP_CALL);
rlm@1:           goto reentry;
rlm@1:         }
rlm@1:       }
rlm@1:       case OP_FORLOOP: {
rlm@1:         lua_Number step = nvalue(ra+2);
rlm@1:         lua_Number idx = luai_numadd(nvalue(ra), step); /* increment index */
rlm@1:         lua_Number limit = nvalue(ra+1);
rlm@1:         if (luai_numlt(0, step) ? luai_numle(idx, limit)
rlm@1:                                 : luai_numle(limit, idx)) {
rlm@1:           dojump(L, pc, GETARG_sBx(i));  /* jump back */
rlm@1:           setnvalue(ra, idx);  /* update internal index... */
rlm@1:           setnvalue(ra+3, idx);  /* ...and external index */
rlm@1:         }
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_FORPREP: {
rlm@1:         const TValue *init = ra;
rlm@1:         const TValue *plimit = ra+1;
rlm@1:         const TValue *pstep = ra+2;
rlm@1:         L->savedpc = pc;  /* next steps may throw errors */
rlm@1:         if (!tonumber(init, ra))
rlm@1:           luaG_runerror(L, LUA_QL("for") " initial value must be a number");
rlm@1:         else if (!tonumber(plimit, ra+1))
rlm@1:           luaG_runerror(L, LUA_QL("for") " limit must be a number");
rlm@1:         else if (!tonumber(pstep, ra+2))
rlm@1:           luaG_runerror(L, LUA_QL("for") " step must be a number");
rlm@1:         setnvalue(ra, luai_numsub(nvalue(ra), nvalue(pstep)));
rlm@1:         dojump(L, pc, GETARG_sBx(i));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_TFORLOOP: {
rlm@1:         StkId cb = ra + 3;  /* call base */
rlm@1:         setobjs2s(L, cb+2, ra+2);
rlm@1:         setobjs2s(L, cb+1, ra+1);
rlm@1:         setobjs2s(L, cb, ra);
rlm@1:         L->top = cb+3;  /* func. + 2 args (state and index) */
rlm@1:         Protect(luaD_call(L, cb, GETARG_C(i)));
rlm@1:         L->top = L->ci->top;
rlm@1:         cb = RA(i) + 3;  /* previous call may change the stack */
rlm@1:         if (!ttisnil(cb)) {  /* continue loop? */
rlm@1:           setobjs2s(L, cb-1, cb);  /* save control variable */
rlm@1:           dojump(L, pc, GETARG_sBx(*pc));  /* jump back */
rlm@1:         }
rlm@1:         pc++;
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_SETLIST: {
rlm@1:         int n = GETARG_B(i);
rlm@1:         int c = GETARG_C(i);
rlm@1:         int last;
rlm@1:         Table *h;
rlm@1:         if (n == 0) {
rlm@1:           n = cast_int(L->top - ra) - 1;
rlm@1:           L->top = L->ci->top;
rlm@1:         }
rlm@1:         if (c == 0) c = cast_int(*pc++);
rlm@1:         runtime_check(L, ttistable(ra));
rlm@1:         h = hvalue(ra);
rlm@1:         last = ((c-1)*LFIELDS_PER_FLUSH) + n;
rlm@1:         if (last > h->sizearray)  /* needs more space? */
rlm@1:           luaH_resizearray(L, h, last);  /* pre-alloc it at once */
rlm@1:         for (; n > 0; n--) {
rlm@1:           TValue *val = ra+n;
rlm@1:           setobj2t(L, luaH_setnum(L, h, last--), val);
rlm@1:           luaC_barriert(L, h, val);
rlm@1:         }
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_CLOSE: {
rlm@1:         luaF_close(L, ra);
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_CLOSURE: {
rlm@1:         Proto *p;
rlm@1:         Closure *ncl;
rlm@1:         int nup, j;
rlm@1:         p = cl->p->p[GETARG_Bx(i)];
rlm@1:         nup = p->nups;
rlm@1:         ncl = luaF_newLclosure(L, nup, cl->env);
rlm@1:         ncl->l.p = p;
rlm@1:         for (j=0; j<nup; j++, pc++) {
rlm@1:           if (GET_OPCODE(*pc) == OP_GETUPVAL)
rlm@1:             ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
rlm@1:           else {
rlm@1:             lua_assert(GET_OPCODE(*pc) == OP_MOVE);
rlm@1:             ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
rlm@1:           }
rlm@1:         }
rlm@1:         setclvalue(L, ra, ncl);
rlm@1:         Protect(luaC_checkGC(L));
rlm@1:         continue;
rlm@1:       }
rlm@1:       case OP_VARARG: {
rlm@1:         int b = GETARG_B(i) - 1;
rlm@1:         int j;
rlm@1:         CallInfo *ci = L->ci;
rlm@1:         int n = cast_int(ci->base - ci->func) - cl->p->numparams - 1;
rlm@1:         if (b == LUA_MULTRET) {
rlm@1:           Protect(luaD_checkstack(L, n));
rlm@1:           ra = RA(i);  /* previous call may change the stack */
rlm@1:           b = n;
rlm@1:           L->top = ra + n;
rlm@1:         }
rlm@1:         for (j = 0; j < b; j++) {
rlm@1:           if (j < n) {
rlm@1:             setobjs2s(L, ra + j, ci->base - n + j);
rlm@1:           }
rlm@1:           else {
rlm@1:             setnilvalue(ra + j);
rlm@1:           }
rlm@1:         }
rlm@1:         continue;
rlm@1:       }
rlm@1:     }
rlm@1:   }
rlm@1: }
rlm@1: