X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/9bdf097756ebae6eb61b78f2d5888c08b343d408..ba8b5c173b20a92036384e114f9b5827de7596dc:/liblua/lvm.c diff --git a/liblua/lvm.c b/liblua/lvm.c new file mode 100644 index 00000000..657d5c45 --- /dev/null +++ b/liblua/lvm.c @@ -0,0 +1,867 @@ +/* +** $Id: lvm.c,v 2.155 2013/03/16 21:10:18 roberto Exp $ +** Lua virtual machine +** See Copyright Notice in lua.h +*/ + + +#include +#include +#include + +#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), tsvalue(obj)->len, &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); + int l = lua_number2str(s, n); + setsvalue2s(L, obj, luaS_newlstr(L, s, l)); + return 1; + } +} + + +static void traceexec (lua_State *L) { + CallInfo *ci = L->ci; + lu_byte mask = L->hookmask; + int counthook = ((mask & LUA_MASKCOUNT) && L->hookcount == 0); + if (counthook) + resethookcount(L); /* reset count */ + if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */ + ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */ + return; /* do not call hook again (VM yielded, so it did not move) */ + } + if (counthook) + luaD_hook(L, LUA_HOOKCOUNT, -1); /* call count hook */ + if (mask & LUA_MASKLINE) { + Proto *p = ci_func(ci)->p; + int npc = pcRel(ci->u.l.savedpc, p); + int newline = getfuncline(p, npc); + if (npc == 0 || /* call linehook when enter a new function, */ + ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */ + newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */ + luaD_hook(L, LUA_HOOKLINE, newline); /* call line hook */ + } + L->oldpc = ci->u.l.savedpc; + if (L->status == LUA_YIELD) { /* did hook yield? */ + if (counthook) + L->hookcount = 1; /* undo decrement to zero */ + ci->u.l.savedpc--; /* undo increment (resume will increment it again) */ + ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */ + ci->func = L->top - 1; /* protect stack below results */ + luaD_throw(L, LUA_YIELD); + } +} + + +static void callTM (lua_State *L, const TValue *f, const TValue *p1, + const TValue *p2, TValue *p3, int hasres) { + ptrdiff_t result = savestack(L, p3); + setobj2s(L, L->top++, f); /* push function */ + setobj2s(L, L->top++, p1); /* 1st argument */ + setobj2s(L, L->top++, p2); /* 2nd argument */ + if (!hasres) /* no result? 'p3' is third argument */ + setobj2s(L, L->top++, p3); /* 3rd argument */ + /* metamethod may yield only when called from Lua code */ + luaD_call(L, L->top - (4 - hasres), hasres, isLua(L->ci)); + if (hasres) { /* if has result, move it to its place */ + p3 = restorestack(L, result); + setobjs2s(L, p3, --L->top); + } +} + + +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 not 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)) { + callTM(L, tm, t, key, val, 1); + 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 = cast(TValue *, luaH_get(h, key)); + /* if previous value is not nil, there must be a previous entry + in the table; moreover, a metamethod has no relevance */ + if (!ttisnil(oldval) || + /* previous value is nil; must check the metamethod */ + ((tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL && + /* no metamethod; is there a previous entry in the table? */ + (oldval != luaO_nilobject || + /* no previous entry; must create one. (The next test is + always true; we only need the assignment.) */ + (oldval = luaH_newkey(L, h, key), 1)))) { + /* no metamethod and (now) there is an entry with given key */ + setobj2t(L, oldval, val); /* assign new value to that entry */ + invalidateTMcache(h); + luaC_barrierback(L, obj2gco(h), val); + return; + } + /* else will try the metamethod */ + } + else /* not a table; check metamethod */ + if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX))) + luaG_typeerror(L, t, "index"); + /* there is a metamethod */ + if (ttisfunction(tm)) { + callTM(L, tm, t, key, val, 0); + 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; + callTM(L, tm, p1, p2, res, 1); + return 1; +} + + +static const TValue *get_equalTM (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 (luaV_rawequalobj(tm1, tm2)) /* same metamethods? */ + return tm1; + return NULL; +} + + +static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2, + TMS event) { + if (!call_binTM(L, p1, p2, L->top, event)) + return -1; /* no metamethod */ + else + 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 (ttisnumber(l) && ttisnumber(r)) + return luai_numlt(L, nvalue(l), nvalue(r)); + else if (ttisstring(l) && ttisstring(r)) + return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0; + else if ((res = call_orderTM(L, l, r, TM_LT)) < 0) + luaG_ordererror(L, l, r); + return res; +} + + +int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) { + int res; + if (ttisnumber(l) && ttisnumber(r)) + return luai_numle(L, nvalue(l), nvalue(r)); + else if (ttisstring(l) && ttisstring(r)) + return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0; + else if ((res = call_orderTM(L, l, r, TM_LE)) >= 0) /* first try `le' */ + return res; + else if ((res = call_orderTM(L, r, l, TM_LT)) < 0) /* else try `lt' */ + luaG_ordererror(L, l, r); + return !res; +} + + +/* +** equality of Lua values. L == NULL means raw equality (no metamethods) +*/ +int luaV_equalobj_ (lua_State *L, const TValue *t1, const TValue *t2) { + const TValue *tm; + lua_assert(ttisequal(t1, 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_TLCF: return fvalue(t1) == fvalue(t2); + case LUA_TSHRSTR: return eqshrstr(rawtsvalue(t1), rawtsvalue(t2)); + case LUA_TLNGSTR: return luaS_eqlngstr(rawtsvalue(t1), rawtsvalue(t2)); + case LUA_TUSERDATA: { + if (uvalue(t1) == uvalue(t2)) return 1; + else if (L == NULL) return 0; + tm = get_equalTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable, TM_EQ); + break; /* will try TM */ + } + case LUA_TTABLE: { + if (hvalue(t1) == hvalue(t2)) return 1; + else if (L == NULL) return 0; + tm = get_equalTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ); + break; /* will try TM */ + } + default: + lua_assert(iscollectable(t1)); + return gcvalue(t1) == gcvalue(t2); + } + if (tm == NULL) return 0; /* no TM? */ + callTM(L, tm, t1, t2, L->top, 1); /* call TM */ + return !l_isfalse(L->top); +} + + +void luaV_concat (lua_State *L, int total) { + lua_assert(total >= 2); + do { + StkId top = L->top; + 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 operand is empty? */ + (void)tostring(L, top - 2); /* result is first operand */ + else if (ttisstring(top-2) && tsvalue(top-2)->len == 0) { + setobjs2s(L, top - 2, top - 1); /* result is second op. */ + } + else { + /* at least two non-empty string values; get as many as possible */ + size_t tl = tsvalue(top-1)->len; + char *buffer; + int i; + /* collect total length */ + for (i = 1; i < total && tostring(L, top-i-1); i++) { + size_t l = tsvalue(top-i-1)->len; + if (l >= (MAX_SIZET/sizeof(char)) - tl) + luaG_runerror(L, "string length overflow"); + tl += l; + } + buffer = luaZ_openspace(L, &G(L)->buff, tl); + tl = 0; + n = i; + do { /* concat all strings */ + size_t l = tsvalue(top-i)->len; + memcpy(buffer+tl, svalue(top-i), l * sizeof(char)); + tl += l; + } while (--i > 0); + setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl)); + } + total -= n-1; /* got 'n' strings to create 1 new */ + L->top -= n-1; /* popped 'n' strings and pushed one */ + } while (total > 1); /* repeat until only 1 result left */ +} + + +void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) { + const TValue *tm; + switch (ttypenv(rb)) { + case LUA_TTABLE: { + Table *h = hvalue(rb); + tm = fasttm(L, h->metatable, TM_LEN); + if (tm) break; /* metamethod? break switch to call it */ + setnvalue(ra, cast_num(luaH_getn(h))); /* else primitive len */ + return; + } + case LUA_TSTRING: { + setnvalue(ra, cast_num(tsvalue(rb)->len)); + return; + } + default: { /* try metamethod */ + tm = luaT_gettmbyobj(L, rb, TM_LEN); + if (ttisnil(tm)) /* no metamethod? */ + luaG_typeerror(L, rb, "get length of"); + break; + } + } + callTM(L, tm, rb, rb, ra, 1); +} + + +void luaV_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 res = luaO_arith(op - TM_ADD + LUA_OPADD, nvalue(b), nvalue(c)); + setnvalue(ra, res); + } + else if (!call_binTM(L, rb, rc, ra, op)) + luaG_aritherror(L, rb, rc); +} + + +/* +** check whether cached closure in prototype 'p' may be reused, that is, +** whether there is a cached closure with the same upvalues needed by +** new closure to be created. +*/ +static Closure *getcached (Proto *p, UpVal **encup, StkId base) { + Closure *c = p->cache; + if (c != NULL) { /* is there a cached closure? */ + int nup = p->sizeupvalues; + Upvaldesc *uv = p->upvalues; + int i; + for (i = 0; i < nup; i++) { /* check whether it has right upvalues */ + TValue *v = uv[i].instack ? base + uv[i].idx : encup[uv[i].idx]->v; + if (c->l.upvals[i]->v != v) + return NULL; /* wrong upvalue; cannot reuse closure */ + } + } + return c; /* return cached closure (or NULL if no cached closure) */ +} + + +/* +** create a new Lua closure, push it in the stack, and initialize +** its upvalues. Note that the call to 'luaC_barrierproto' must come +** before the assignment to 'p->cache', as the function needs the +** original value of that field. +*/ +static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base, + StkId ra) { + int nup = p->sizeupvalues; + Upvaldesc *uv = p->upvalues; + int i; + Closure *ncl = luaF_newLclosure(L, nup); + ncl->l.p = p; + setclLvalue(L, ra, ncl); /* anchor new closure in stack */ + for (i = 0; i < nup; i++) { /* fill in its upvalues */ + if (uv[i].instack) /* upvalue refers to local variable? */ + ncl->l.upvals[i] = luaF_findupval(L, base + uv[i].idx); + else /* get upvalue from enclosing function */ + ncl->l.upvals[i] = encup[uv[i].idx]; + } + luaC_barrierproto(L, p, ncl); + p->cache = ncl; /* save it on cache for reuse */ +} + + +/* +** finish execution of an opcode interrupted by an yield +*/ +void luaV_finishOp (lua_State *L) { + CallInfo *ci = L->ci; + StkId base = ci->u.l.base; + Instruction inst = *(ci->u.l.savedpc - 1); /* interrupted instruction */ + OpCode op = GET_OPCODE(inst); + switch (op) { /* finish its execution */ + case OP_ADD: case OP_SUB: case OP_MUL: case OP_DIV: + case OP_MOD: case OP_POW: case OP_UNM: case OP_LEN: + case OP_GETTABUP: case OP_GETTABLE: case OP_SELF: { + setobjs2s(L, base + GETARG_A(inst), --L->top); + break; + } + case OP_LE: case OP_LT: case OP_EQ: { + int res = !l_isfalse(L->top - 1); + L->top--; + /* metamethod should not be called when operand is K */ + lua_assert(!ISK(GETARG_B(inst))); + if (op == OP_LE && /* "<=" using "<" instead? */ + ttisnil(luaT_gettmbyobj(L, base + GETARG_B(inst), TM_LE))) + res = !res; /* invert result */ + lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_JMP); + if (res != GETARG_A(inst)) /* condition failed? */ + ci->u.l.savedpc++; /* skip jump instruction */ + break; + } + case OP_CONCAT: { + StkId top = L->top - 1; /* top when 'call_binTM' was called */ + int b = GETARG_B(inst); /* first element to concatenate */ + int total = cast_int(top - 1 - (base + b)); /* yet to concatenate */ + setobj2s(L, top - 2, top); /* put TM result in proper position */ + if (total > 1) { /* are there elements to concat? */ + L->top = top - 1; /* top is one after last element (at top-2) */ + 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); + L->top = ci->top; /* restore top */ + break; + } + case OP_TFORCALL: { + lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_TFORLOOP); + L->top = ci->top; /* correct top */ + break; + } + case OP_CALL: { + if (GETARG_C(inst) - 1 >= 0) /* nresults >= 0? */ + L->top = ci->top; /* adjust results */ + break; + } + case OP_TAILCALL: case OP_SETTABUP: case OP_SETTABLE: + break; + default: lua_assert(0); + } +} + + + +/* +** some macros for common tasks in `luaV_execute' +*/ + +#if !defined luai_runtimecheck +#define luai_runtimecheck(L, c) /* void */ +#endif + + +#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) \ + (k + (GETARG_Bx(i) != 0 ? GETARG_Bx(i) - 1 : GETARG_Ax(*ci->u.l.savedpc++))) + + +/* execute a jump instruction */ +#define dojump(ci,i,e) \ + { int a = GETARG_A(i); \ + if (a > 0) luaF_close(L, ci->u.l.base + a - 1); \ + ci->u.l.savedpc += GETARG_sBx(i) + e; } + +/* for test instructions, execute the jump instruction that follows it */ +#define donextjump(ci) { i = *ci->u.l.savedpc; dojump(ci, i, 1); } + + +#define Protect(x) { {x;}; base = ci->u.l.base; } + +#define checkGC(L,c) \ + Protect( luaC_condGC(L,{L->top = (c); /* limit of live values */ \ + luaC_step(L); \ + L->top = ci->top;}) /* restore top */ \ + luai_threadyield(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(L, nb, nc)); \ + } \ + else { Protect(luaV_arith(L, ra, rb, rc, tm)); } } + + +#define vmdispatch(o) switch(o) +#define vmcase(l,b) case l: {b} break; +#define vmcasenb(l,b) case l: {b} /* nb = no break */ + +void luaV_execute (lua_State *L) { + CallInfo *ci = L->ci; + LClosure *cl; + TValue *k; + StkId base; + newframe: /* reentry point when frame changes (call/return) */ + lua_assert(ci == L->ci); + cl = clLvalue(ci->func); + k = cl->p->k; + base = ci->u.l.base; + /* main loop of interpreter */ + for (;;) { + Instruction i = *(ci->u.l.savedpc++); + StkId ra; + if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) && + (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) { + Protect(traceexec(L)); + } + /* WARNING: several calls may realloc the stack and invalidate `ra' */ + ra = RA(i); + lua_assert(base == ci->u.l.base); + lua_assert(base <= L->top && L->top < L->stack + L->stacksize); + vmdispatch (GET_OPCODE(i)) { + vmcase(OP_MOVE, + setobjs2s(L, ra, RB(i)); + ) + vmcase(OP_LOADK, + TValue *rb = k + GETARG_Bx(i); + setobj2s(L, ra, rb); + ) + vmcase(OP_LOADKX, + TValue *rb; + lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG); + rb = k + GETARG_Ax(*ci->u.l.savedpc++); + setobj2s(L, ra, rb); + ) + vmcase(OP_LOADBOOL, + setbvalue(ra, GETARG_B(i)); + if (GETARG_C(i)) ci->u.l.savedpc++; /* skip next instruction (if C) */ + ) + vmcase(OP_LOADNIL, + int b = GETARG_B(i); + do { + setnilvalue(ra++); + } while (b--); + ) + vmcase(OP_GETUPVAL, + int b = GETARG_B(i); + setobj2s(L, ra, cl->upvals[b]->v); + ) + vmcase(OP_GETTABUP, + int b = GETARG_B(i); + Protect(luaV_gettable(L, cl->upvals[b]->v, RKC(i), ra)); + ) + vmcase(OP_GETTABLE, + Protect(luaV_gettable(L, RB(i), RKC(i), ra)); + ) + vmcase(OP_SETTABUP, + int a = GETARG_A(i); + Protect(luaV_settable(L, cl->upvals[a]->v, RKB(i), RKC(i))); + ) + vmcase(OP_SETUPVAL, + UpVal *uv = cl->upvals[GETARG_B(i)]; + setobj(L, uv->v, ra); + luaC_barrier(L, uv, ra); + ) + vmcase(OP_SETTABLE, + Protect(luaV_settable(L, ra, RKB(i), RKC(i))); + ) + vmcase(OP_NEWTABLE, + int b = GETARG_B(i); + int c = GETARG_C(i); + Table *t = luaH_new(L); + sethvalue(L, ra, t); + if (b != 0 || c != 0) + luaH_resize(L, t, luaO_fb2int(b), luaO_fb2int(c)); + checkGC(L, ra + 1); + ) + vmcase(OP_SELF, + StkId rb = RB(i); + setobjs2s(L, ra+1, rb); + Protect(luaV_gettable(L, rb, RKC(i), ra)); + ) + vmcase(OP_ADD, + arith_op(luai_numadd, TM_ADD); + ) + vmcase(OP_SUB, + arith_op(luai_numsub, TM_SUB); + ) + vmcase(OP_MUL, + arith_op(luai_nummul, TM_MUL); + ) + vmcase(OP_DIV, + arith_op(luai_numdiv, TM_DIV); + ) + vmcase(OP_MOD, + arith_op(luai_nummod, TM_MOD); + ) + vmcase(OP_POW, + arith_op(luai_numpow, TM_POW); + ) + vmcase(OP_UNM, + TValue *rb = RB(i); + if (ttisnumber(rb)) { + lua_Number nb = nvalue(rb); + setnvalue(ra, luai_numunm(L, nb)); + } + else { + Protect(luaV_arith(L, ra, rb, rb, TM_UNM)); + } + ) + vmcase(OP_NOT, + TValue *rb = RB(i); + int res = l_isfalse(rb); /* next assignment may change this value */ + setbvalue(ra, res); + ) + vmcase(OP_LEN, + Protect(luaV_objlen(L, ra, RB(i))); + ) + vmcase(OP_CONCAT, + int b = GETARG_B(i); + int c = GETARG_C(i); + StkId rb; + L->top = base + c + 1; /* mark the end of concat operands */ + Protect(luaV_concat(L, c - b + 1)); + ra = RA(i); /* 'luav_concat' may invoke TMs and move the stack */ + rb = b + base; + setobjs2s(L, ra, rb); + checkGC(L, (ra >= rb ? ra + 1 : rb)); + L->top = ci->top; /* restore top */ + ) + vmcase(OP_JMP, + dojump(ci, i, 0); + ) + vmcase(OP_EQ, + TValue *rb = RKB(i); + TValue *rc = RKC(i); + Protect( + if (cast_int(equalobj(L, rb, rc)) != GETARG_A(i)) + ci->u.l.savedpc++; + else + donextjump(ci); + ) + ) + vmcase(OP_LT, + Protect( + if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i)) + ci->u.l.savedpc++; + else + donextjump(ci); + ) + ) + vmcase(OP_LE, + Protect( + if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i)) + ci->u.l.savedpc++; + else + donextjump(ci); + ) + ) + vmcase(OP_TEST, + if (GETARG_C(i) ? l_isfalse(ra) : !l_isfalse(ra)) + ci->u.l.savedpc++; + else + donextjump(ci); + ) + vmcase(OP_TESTSET, + TValue *rb = RB(i); + if (GETARG_C(i) ? l_isfalse(rb) : !l_isfalse(rb)) + ci->u.l.savedpc++; + else { + setobjs2s(L, ra, rb); + donextjump(ci); + } + ) + vmcase(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 */ + if (luaD_precall(L, ra, nresults)) { /* C function? */ + if (nresults >= 0) L->top = ci->top; /* adjust results */ + base = ci->u.l.base; + } + else { /* Lua function */ + ci = L->ci; + ci->callstatus |= CIST_REENTRY; + goto newframe; /* restart luaV_execute over new Lua function */ + } + ) + vmcase(OP_TAILCALL, + int b = GETARG_B(i); + if (b != 0) L->top = ra+b; /* else previous instruction set top */ + lua_assert(GETARG_C(i) - 1 == LUA_MULTRET); + if (luaD_precall(L, ra, LUA_MULTRET)) /* C function? */ + base = ci->u.l.base; + else { + /* tail call: put called frame (n) in place of caller one (o) */ + CallInfo *nci = L->ci; /* called frame */ + CallInfo *oci = nci->previous; /* caller frame */ + 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; + int aux; + /* close all upvalues from previous call */ + if (cl->p->sizep > 0) luaF_close(L, oci->u.l.base); + /* 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); + goto newframe; /* restart luaV_execute over new Lua function */ + } + ) + vmcasenb(OP_RETURN, + int b = GETARG_B(i); + if (b != 0) L->top = ra+b-1; + if (cl->p->sizep > 0) luaF_close(L, base); + b = luaD_poscall(L, ra); + if (!(ci->callstatus & CIST_REENTRY)) /* 'ci' still the called one */ + return; /* external invocation: return */ + else { /* invocation via reentry: continue execution */ + ci = L->ci; + if (b) L->top = ci->top; + lua_assert(isLua(ci)); + lua_assert(GET_OPCODE(*((ci)->u.l.savedpc - 1)) == OP_CALL); + goto newframe; /* restart luaV_execute over new Lua function */ + } + ) + vmcase(OP_FORLOOP, + lua_Number step = nvalue(ra+2); + lua_Number idx = luai_numadd(L, nvalue(ra), step); /* increment index */ + lua_Number limit = nvalue(ra+1); + if (luai_numlt(L, 0, step) ? luai_numle(L, idx, limit) + : luai_numle(L, limit, idx)) { + ci->u.l.savedpc += GETARG_sBx(i); /* jump back */ + setnvalue(ra, idx); /* update internal index... */ + setnvalue(ra+3, idx); /* ...and external index */ + } + ) + vmcase(OP_FORPREP, + const TValue *init = ra; + const TValue *plimit = ra+1; + const TValue *pstep = ra+2; + 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(L, nvalue(ra), nvalue(pstep))); + ci->u.l.savedpc += GETARG_sBx(i); + ) + vmcasenb(OP_TFORCALL, + 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), 1)); + L->top = ci->top; + i = *(ci->u.l.savedpc++); /* go to next instruction */ + ra = RA(i); + lua_assert(GET_OPCODE(i) == OP_TFORLOOP); + goto l_tforloop; + ) + vmcase(OP_TFORLOOP, + l_tforloop: + if (!ttisnil(ra + 1)) { /* continue loop? */ + setobjs2s(L, ra, ra + 1); /* save control variable */ + ci->u.l.savedpc += GETARG_sBx(i); /* jump back */ + } + ) + vmcase(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; + if (c == 0) { + lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG); + c = GETARG_Ax(*ci->u.l.savedpc++); + } + luai_runtimecheck(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-allocate it at once */ + for (; n > 0; n--) { + TValue *val = ra+n; + luaH_setint(L, h, last--, val); + luaC_barrierback(L, obj2gco(h), val); + } + L->top = ci->top; /* correct top (in case of previous open call) */ + ) + vmcase(OP_CLOSURE, + Proto *p = cl->p->p[GETARG_Bx(i)]; + Closure *ncl = getcached(p, cl->upvals, base); /* cached closure */ + if (ncl == NULL) /* no match? */ + pushclosure(L, p, cl->upvals, base, ra); /* create a new one */ + else + setclLvalue(L, ra, ncl); /* push cashed closure */ + checkGC(L, ra + 1); + ) + vmcase(OP_VARARG, + int b = GETARG_B(i) - 1; + int j; + int n = cast_int(base - ci->func) - cl->p->numparams - 1; + if (b < 0) { /* B == 0? */ + b = n; /* get all var. arguments */ + Protect(luaD_checkstack(L, n)); + ra = RA(i); /* previous call may change the stack */ + L->top = ra + n; + } + for (j = 0; j < b; j++) { + if (j < n) { + setobjs2s(L, ra + j, base - n + j); + } + else { + setnilvalue(ra + j); + } + } + ) + vmcase(OP_EXTRAARG, + lua_assert(0); + ) + } + } +} +