--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/liblua/lvm.c Mon Feb 15 19:49:20 2010 +0000
@@ -0,0 +1,763 @@
+/*
+** $Id: lvm.c,v 2.63.1.3 2007/12/28 15:32:23 roberto Exp $
+** Lua virtual machine
+** See Copyright Notice in lua.h
+*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define lvm_c
+#define LUA_CORE
+
+#include "lua.h"
+
+#include "ldebug.h"
+#include "ldo.h"
+#include "lfunc.h"
+#include "lgc.h"
+#include "lobject.h"
+#include "lopcodes.h"
+#include "lstate.h"
+#include "lstring.h"
+#include "ltable.h"
+#include "ltm.h"
+#include "lvm.h"
+
+
+
+/* limit for table tag-method chains (to avoid loops) */
+#define MAXTAGLOOP 100
+
+
+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)) {
+ setnvalue(n, num);
+ return n;
+ }
+ else
+ return NULL;
+}
+
+
+int luaV_tostring (lua_State *L, StkId obj) {
+ if (!ttisnumber(obj))
+ return 0;
+ else {
+ char s[LUAI_MAXNUMBER2STR];
+ lua_Number n = nvalue(obj);
+ lua_number2str(s, n);
+ setsvalue2s(L, obj, luaS_new(L, s));
+ return 1;
+ }
+}
+
+
+static void traceexec (lua_State *L, const Instruction *pc) {
+ lu_byte mask = L->hookmask;
+ const Instruction *oldpc = L->savedpc;
+ L->savedpc = pc;
+ if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
+ resethookcount(L);
+ luaD_callhook(L, LUA_HOOKCOUNT, -1);
+ }
+ if (mask & LUA_MASKLINE) {
+ 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);
+ }
+}
+
+
+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);
+ res = restorestack(L, result);
+ L->top--;
+ setobjs2s(L, res, L->top);
+}
+
+
+
+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);
+}
+
+
+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' */
+ }
+ luaG_runerror(L, "loop in gettable");
+}
+
+
+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);
+ 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(L, oldval, val);
+ luaC_barriert(L, h, val);
+ return;
+ }
+ /* else will try the tag method */
+ }
+ else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
+ luaG_typeerror(L, t, "index");
+ if (ttisfunction(tm)) {
+ callTM(L, tm, t, key, val);
+ return;
+ }
+ t = tm; /* else repeat with `tm' */
+ }
+ luaG_runerror(L, "loop in settable");
+}
+
+
+static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
+ StkId res, TMS event) {
+ const TValue *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
+ if (ttisnil(tm))
+ tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
+ if (ttisnil(tm)) return 0;
+ callTMres(L, res, tm, p1, p2);
+ return 1;
+}
+
+
+static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
+ TMS event) {
+ 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);
+ if (tm2 == NULL) return NULL; /* no metamethod */
+ if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
+ return tm1;
+ return NULL;
+}
+
+
+static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
+ TMS event) {
+ 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, L->top, tm1, p1, p2);
+ return !l_isfalse(L->top);
+}
+
+
+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);
+ size_t lr = rs->tsv.len;
+ for (;;) {
+ int temp = strcoll(l, r);
+ if (temp != 0) return temp;
+ else { /* strings are equal up to a `\0' */
+ size_t len = strlen(l); /* index of first `\0' in both strings */
+ if (len == lr) /* r is finished? */
+ return (len == ll) ? 0 : 1;
+ else if (len == ll) /* l is finished? */
+ return -1; /* l is smaller than r (because r is not finished) */
+ /* both strings longer than `len'; go on comparing (after the `\0') */
+ len++;
+ l += len; ll -= len; r += len; lr -= len;
+ }
+ }
+}
+
+
+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 luai_numlt(nvalue(l), nvalue(r));
+ else if (ttisstring(l))
+ 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 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 luai_numle(nvalue(l), nvalue(r));
+ else if (ttisstring(l))
+ 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' */
+ return !res;
+ return luaG_ordererror(L, l, r);
+}
+
+
+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 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)->metatable, uvalue(t2)->metatable,
+ TM_EQ);
+ break; /* will try TM */
+ }
+ case LUA_TTABLE: {
+ if (hvalue(t1) == hvalue(t2)) return 1;
+ tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
+ break; /* will try TM */
+ }
+ default: return gcvalue(t1) == gcvalue(t2);
+ }
+ if (tm == NULL) return 0; /* no TM? */
+ callTMres(L, L->top, tm, t1, t2); /* call TM */
+ return !l_isfalse(L->top);
+}
+
+
+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 (!(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)->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)->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)->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)->len;
+ memcpy(buffer+tl, svalue(top-i), l);
+ tl += l;
+ }
+ setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
+ }
+ total -= n-1; /* got `n' strings to create 1 new */
+ last -= n-1;
+ } while (total > 1); /* repeat until only 1 result left */
+}
+
+
+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, 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;
+ }
+ }
+ else if (!call_binTM(L, rb, rc, ra, op))
+ luaG_aritherror(L, rb, rc);
+}
+
+
+
+/*
+** some macros for common tasks in `luaV_execute'
+*/
+
+#define runtime_check(L, c) { if (!(c)) break; }
+
+#define RA(i) (base+GETARG_A(i))
+/* to be used after possible stack reallocation */
+#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 Protect(x) { L->savedpc = pc; {x;}; base = L->base; }
+
+
+#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;
+ StkId base;
+ TValue *k;
+ const Instruction *pc;
+ 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 ra;
+ if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
+ (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
+ traceexec(L, pc);
+ if (L->status == LUA_YIELD) { /* did hook yield? */
+ L->savedpc = pc - 1;
+ return;
+ }
+ base = L->base;
+ }
+ /* warning!! several calls may realloc the stack and invalidate `ra' */
+ ra = RA(i);
+ 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(L, ra, RB(i));
+ continue;
+ }
+ case OP_LOADK: {
+ setobj2s(L, ra, KBx(i));
+ continue;
+ }
+ case OP_LOADBOOL: {
+ setbvalue(ra, GETARG_B(i));
+ if (GETARG_C(i)) pc++; /* skip next instruction (if C) */
+ continue;
+ }
+ case OP_LOADNIL: {
+ TValue *rb = RB(i);
+ do {
+ setnilvalue(rb--);
+ } while (rb >= ra);
+ continue;
+ }
+ case OP_GETUPVAL: {
+ int b = GETARG_B(i);
+ setobj2s(L, ra, cl->upvals[b]->v);
+ continue;
+ }
+ case OP_GETGLOBAL: {
+ 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: {
+ Protect(luaV_gettable(L, RB(i), RKC(i), ra));
+ continue;
+ }
+ case OP_SETGLOBAL: {
+ TValue g;
+ sethvalue(L, &g, cl->env);
+ lua_assert(ttisstring(KBx(i)));
+ Protect(luaV_settable(L, &g, KBx(i), ra));
+ continue;
+ }
+ case OP_SETUPVAL: {
+ UpVal *uv = cl->upvals[GETARG_B(i)];
+ setobj(L, uv->v, ra);
+ luaC_barrier(L, uv, ra);
+ continue;
+ }
+ case OP_SETTABLE: {
+ Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
+ continue;
+ }
+ case OP_NEWTABLE: {
+ int b = GETARG_B(i);
+ 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);
+ setobjs2s(L, ra+1, rb);
+ Protect(luaV_gettable(L, rb, RKC(i), ra));
+ continue;
+ }
+ case OP_ADD: {
+ arith_op(luai_numadd, TM_ADD);
+ continue;
+ }
+ case OP_SUB: {
+ arith_op(luai_numsub, TM_SUB);
+ continue;
+ }
+ case OP_MUL: {
+ arith_op(luai_nummul, TM_MUL);
+ continue;
+ }
+ case OP_DIV: {
+ arith_op(luai_numdiv, TM_DIV);
+ continue;
+ }
+ case OP_MOD: {
+ arith_op(luai_nummod, TM_MOD);
+ continue;
+ }
+ case OP_POW: {
+ arith_op(luai_numpow, TM_POW);
+ continue;
+ }
+ case OP_UNM: {
+ TValue *rb = RB(i);
+ if (ttisnumber(rb)) {
+ lua_Number nb = nvalue(rb);
+ setnvalue(ra, luai_numunm(nb));
+ }
+ else {
+ Protect(Arith(L, ra, rb, rb, TM_UNM));
+ }
+ continue;
+ }
+ case OP_NOT: {
+ int res = l_isfalse(RB(i)); /* next assignment may change this value */
+ setbvalue(ra, res);
+ 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);
+ Protect(luaV_concat(L, c-b+1, c); luaC_checkGC(L));
+ setobjs2s(L, RA(i), base+b);
+ continue;
+ }
+ case OP_JMP: {
+ dojump(L, pc, GETARG_sBx(i));
+ continue;
+ }
+ case OP_EQ: {
+ 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: {
+ Protect(
+ if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
+ dojump(L, pc, GETARG_sBx(*pc));
+ )
+ pc++;
+ continue;
+ }
+ case OP_LE: {
+ Protect(
+ if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
+ dojump(L, pc, GETARG_sBx(*pc));
+ )
+ pc++;
+ continue;
+ }
+ case OP_TEST: {
+ 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));
+ }
+ pc++;
+ continue;
+ }
+ case OP_CALL: {
+ int b = GETARG_B(i);
+ int nresults = GETARG_C(i) - 1;
+ if (b != 0) L->top = ra+b; /* else previous instruction set top */
+ L->savedpc = pc;
+ switch (luaD_precall(L, ra, nresults)) {
+ case PCRLUA: {
+ nexeccalls++;
+ goto reentry; /* restart luaV_execute over new Lua function */
+ }
+ case PCRC: {
+ /* it was a C function (`precall' called it); adjust results */
+ if (nresults >= 0) L->top = L->ci->top;
+ base = L->base;
+ continue;
+ }
+ 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;
+ 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 */
+ goto reentry;
+ }
+ case PCRC: { /* it was a C function (`precall' called it) */
+ base = L->base;
+ continue;
+ }
+ default: {
+ return; /* yield */
+ }
+ }
+ }
+ case OP_RETURN: {
+ int b = GETARG_B(i);
+ if (b != 0) L->top = ra+b-1;
+ if (L->openupval) luaF_close(L, base);
+ L->savedpc = pc;
+ b = luaD_poscall(L, ra);
+ if (--nexeccalls == 0) /* was previous function running `here'? */
+ return; /* no: return */
+ else { /* yes: continue its execution */
+ 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 = 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 */
+ }
+ 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: {
+ 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) */
+ Protect(luaD_call(L, cb, GETARG_C(i)));
+ L->top = L->ci->top;
+ 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 */
+ }
+ pc++;
+ continue;
+ }
+ 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);
+ 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);
+ }
+ continue;
+ }
+ case OP_CLOSE: {
+ luaF_close(L, ra);
+ continue;
+ }
+ case OP_CLOSURE: {
+ Proto *p;
+ Closure *ncl;
+ int nup, j;
+ p = cl->p->p[GETARG_Bx(i)];
+ nup = p->nups;
+ ncl = luaF_newLclosure(L, nup, cl->env);
+ ncl->l.p = p;
+ for (j=0; j<nup; j++, pc++) {
+ if (GET_OPCODE(*pc) == OP_GETUPVAL)
+ ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
+ else {
+ lua_assert(GET_OPCODE(*pc) == OP_MOVE);
+ ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
+ }
+ }
+ 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;
+ }
+ }
+ }
+}
+