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-rw-r--r--apps/plugins/lua/lvm.c914
1 files changed, 509 insertions, 405 deletions
diff --git a/apps/plugins/lua/lvm.c b/apps/plugins/lua/lvm.c
index ee3256ab94..141b9fd19c 100644
--- a/apps/plugins/lua/lvm.c
+++ b/apps/plugins/lua/lvm.c
@@ -1,5 +1,5 @@
/*
-** $Id: lvm.c,v 2.63.1.3 2007/12/28 15:32:23 roberto Exp $
+** $Id: lvm.c,v 2.155.1.1 2013/04/12 18:48:47 roberto Exp $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@@ -35,7 +35,7 @@
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)) {
+ if (ttisstring(obj) && luaO_str2d(svalue(obj), tsvalue(obj)->len, &num)) {
setnvalue(n, num);
return n;
}
@@ -50,58 +50,60 @@ int luaV_tostring (lua_State *L, StkId obj) {
else {
char s[LUAI_MAXNUMBER2STR];
lua_Number n = nvalue(obj);
- lua_number2str(s, n);
- setsvalue2s(L, obj, luaS_new(L, s));
+ int l = lua_number2str(s, n);
+ setsvalue2s(L, obj, luaS_newlstr(L, s, l));
return 1;
}
}
-static void traceexec (lua_State *L, const Instruction *pc) {
+static void traceexec (lua_State *L) {
+ CallInfo *ci = L->ci;
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);
+ 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(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);
+ 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 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);
+ 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);
+ }
}
@@ -112,7 +114,7 @@ void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
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? */
+ if (!ttisnil(res) || /* result is not nil? */
(tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
setobj2s(L, val, res);
return;
@@ -122,10 +124,10 @@ void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
luaG_typeerror(L, t, "index");
if (ttisfunction(tm)) {
- callTMres(L, val, tm, t, key);
+ callTM(L, tm, t, key, val, 1);
return;
}
- t = tm; /* else repeat with `tm' */
+ t = tm; /* else repeat with 'tm' */
}
luaG_runerror(L, "loop in gettable");
}
@@ -137,22 +139,34 @@ void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
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);
+ 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 tag method */
+ /* else will try the metamethod */
}
- else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
- luaG_typeerror(L, t, "index");
+ 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);
+ callTM(L, tm, t, key, val, 0);
return;
}
- t = tm; /* else repeat with `tm' */
+ t = tm; /* else repeat with 'tm' */
}
luaG_runerror(L, "loop in settable");
}
@@ -164,12 +178,12 @@ static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
if (ttisnil(tm))
tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
if (ttisnil(tm)) return 0;
- callTMres(L, res, tm, p1, p2);
+ callTM(L, tm, p1, p2, res, 1);
return 1;
}
-static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
+static const TValue *get_equalTM (lua_State *L, Table *mt1, Table *mt2,
TMS event) {
const TValue *tm1 = fasttm(L, mt1, event);
const TValue *tm2;
@@ -177,7 +191,7 @@ static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
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? */
+ if (luaV_rawequalobj(tm1, tm2)) /* same metamethods? */
return tm1;
return NULL;
}
@@ -185,14 +199,10 @@ static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
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);
+ if (!call_binTM(L, p1, p2, L->top, event))
+ return -1; /* no metamethod */
+ else
+ return !l_isfalse(L->top);
}
@@ -220,125 +230,261 @@ static int l_strcmp (const TString *ls, const TString *rs) {
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))
+ 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)) != -1)
- return res;
- return luaG_ordererror(L, l, r);
+ else if ((res = call_orderTM(L, l, r, TM_LT)) < 0)
+ luaG_ordererror(L, l, r);
+ return res;
}
-static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
+int luaV_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))
+ 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)) != -1) /* first try `le' */
+ 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)) != -1) /* else try `lt' */
- return !res;
- return luaG_ordererror(L, l, r);
+ else if ((res = call_orderTM(L, r, l, TM_LT)) < 0) /* else try `lt' */
+ luaG_ordererror(L, l, r);
+ return !res;
}
-int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
+/*
+** 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(ttype(t1) == ttype(t2));
+ 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;
- tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
- TM_EQ);
+ 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;
- tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
+ else if (L == NULL) return 0;
+ tm = get_equalTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
break; /* will try TM */
}
- default: return gcvalue(t1) == gcvalue(t2);
+ default:
+ lua_assert(iscollectable(t1));
+ return gcvalue(t1) == gcvalue(t2);
}
if (tm == NULL) return 0; /* no TM? */
- callTMres(L, L->top, tm, t1, t2); /* call TM */
+ callTM(L, tm, t1, t2, L->top, 1); /* call TM */
return !l_isfalse(L->top);
}
-void luaV_concat (lua_State *L, int total, int last) {
+void luaV_concat (lua_State *L, int total) {
+ lua_assert(total >= 2);
do {
- StkId top = L->base + last + 1;
+ 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 op is empty? */
- (void)tostring(L, top - 2); /* result is first op (as string) */
+ }
+ 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 string values; get as many as possible */
+ /* 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 (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");
+ 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;
- for (i=n; i>0; i--) { /* concat all strings */
+ n = i;
+ do { /* concat all strings */
size_t l = tsvalue(top-i)->len;
- memcpy(buffer+tl, svalue(top-i), l);
+ 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 */
- last -= n-1;
+ 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 */
}
-static void Arith (lua_State *L, StkId ra, const TValue *rb,
- const TValue *rc, TMS op) {
+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 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;
- }
+ 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'
*/
-#define runtime_check(L, c) { if (!(c)) break; }
+#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 */
@@ -348,13 +494,27 @@ static void Arith (lua_State *L, StkId ra, const TValue *rb,
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 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; }
-#define dojump(L,pc,i) {(pc) += (i); luai_threadyield(L);}
+/* 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) { L->savedpc = pc; {x;}; base = L->base; }
+#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) { \
@@ -362,401 +522,345 @@ static void Arith (lua_State *L, StkId ra, const TValue *rb,
TValue *rc = RKC(i); \
if (ttisnumber(rb) && ttisnumber(rc)) { \
lua_Number nb = nvalue(rb), nc = nvalue(rc); \
- setnvalue(ra, op(nb, nc)); \
+ setnvalue(ra, op(L, nb, nc)); \
} \
- else \
- Protect(Arith(L, ra, rb, rc, tm)); \
- }
+ 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, int nexeccalls) {
+void luaV_execute (lua_State *L) {
+ CallInfo *ci = L->ci;
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;
+ 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 (;;) {
- const Instruction i = *pc++;
+ Instruction i = *(ci->u.l.savedpc++);
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;
+ Protect(traceexec(L));
}
- /* warning!! several calls may realloc the stack and invalidate `ra' */
+ /* 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: {
+ 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));
- continue;
- }
- case OP_LOADK: {
- setobj2s(L, ra, KBx(i));
- continue;
- }
- case OP_LOADBOOL: {
+ )
+ 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)) pc++; /* skip next instruction (if C) */
- continue;
- }
- case OP_LOADNIL: {
- TValue *rb = RB(i);
+ if (GETARG_C(i)) ci->u.l.savedpc++; /* skip next instruction (if C) */
+ )
+ vmcase(OP_LOADNIL,
+ int b = GETARG_B(i);
do {
- setnilvalue(rb--);
- } while (rb >= ra);
- continue;
- }
- case OP_GETUPVAL: {
+ setnilvalue(ra++);
+ } while (b--);
+ )
+ vmcase(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: {
+ )
+ 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));
- 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: {
+ )
+ 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);
- continue;
- }
- case OP_SETTABLE: {
+ )
+ vmcase(OP_SETTABLE,
Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
- continue;
- }
- case OP_NEWTABLE: {
+ )
+ vmcase(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: {
+ 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));
- continue;
- }
- case OP_ADD: {
+ )
+ vmcase(OP_ADD,
arith_op(luai_numadd, TM_ADD);
- continue;
- }
- case OP_SUB: {
+ )
+ vmcase(OP_SUB,
arith_op(luai_numsub, TM_SUB);
- continue;
- }
- case OP_MUL: {
+ )
+ vmcase(OP_MUL,
arith_op(luai_nummul, TM_MUL);
- continue;
- }
- case OP_DIV: {
+ )
+ vmcase(OP_DIV,
arith_op(luai_numdiv, TM_DIV);
- continue;
- }
- case OP_MOD: {
+ )
+ vmcase(OP_MOD,
arith_op(luai_nummod, TM_MOD);
- continue;
- }
- case OP_POW: {
+ )
+ vmcase(OP_POW,
arith_op(luai_numpow, TM_POW);
- continue;
- }
- case OP_UNM: {
+ )
+ vmcase(OP_UNM,
TValue *rb = RB(i);
if (ttisnumber(rb)) {
lua_Number nb = nvalue(rb);
- setnvalue(ra, luai_numunm(nb));
+ setnvalue(ra, luai_numunm(L, nb));
}
else {
- Protect(Arith(L, ra, rb, rb, TM_UNM));
+ Protect(luaV_arith(L, ra, rb, rb, TM_UNM));
}
- continue;
- }
- case OP_NOT: {
- int res = l_isfalse(RB(i)); /* next assignment may change this value */
+ )
+ vmcase(OP_NOT,
+ TValue *rb = RB(i);
+ int res = l_isfalse(rb); /* 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: {
+ )
+ vmcase(OP_LEN,
+ Protect(luaV_objlen(L, ra, RB(i)));
+ )
+ vmcase(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: {
+ 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 (equalobj(L, rb, rc) == GETARG_A(i))
- dojump(L, pc, GETARG_sBx(*pc));
+ if (cast_int(equalobj(L, rb, rc)) != GETARG_A(i))
+ ci->u.l.savedpc++;
+ else
+ donextjump(ci);
)
- pc++;
- continue;
- }
- case OP_LT: {
+ )
+ vmcase(OP_LT,
Protect(
- if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
- dojump(L, pc, GETARG_sBx(*pc));
+ if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i))
+ ci->u.l.savedpc++;
+ else
+ donextjump(ci);
)
- pc++;
- continue;
- }
- case OP_LE: {
+ )
+ vmcase(OP_LE,
Protect(
- if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
- dojump(L, pc, GETARG_sBx(*pc));
+ if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i))
+ ci->u.l.savedpc++;
+ else
+ donextjump(ci);
)
- pc++;
- continue;
- }
- case OP_TEST: {
- if (l_isfalse(ra) != GETARG_C(i))
- dojump(L, pc, GETARG_sBx(*pc));
- pc++;
- continue;
- }
- case OP_TESTSET: {
+ )
+ 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 (l_isfalse(rb) != GETARG_C(i)) {
+ if (GETARG_C(i) ? l_isfalse(rb) : !l_isfalse(rb))
+ ci->u.l.savedpc++;
+ else {
setobjs2s(L, ra, rb);
- dojump(L, pc, GETARG_sBx(*pc));
+ donextjump(ci);
}
- pc++;
- continue;
- }
- case OP_CALL: {
+ )
+ 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 */
- 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 */
- }
+ if (luaD_precall(L, ra, nresults)) { /* C function? */
+ if (nresults >= 0) L->top = ci->top; /* adjust results */
+ base = ci->u.l.base;
}
- }
- case OP_TAILCALL: {
+ 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 */
- 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 */
- }
+ 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 */
}
- }
- case OP_RETURN: {
+ )
+ vmcasenb(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;
+ if (cl->p->sizep > 0) luaF_close(L, base);
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;
+ 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 */
}
- }
- case OP_FORLOOP: {
+ )
+ vmcase(OP_FORLOOP,
lua_Number step = nvalue(ra+2);
- lua_Number idx = luai_numadd(nvalue(ra), step); /* increment index */
+ lua_Number idx = luai_numadd(L, 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 */
+ 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 */
}
- continue;
- }
- case OP_FORPREP: {
+ )
+ vmcase(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: {
+ 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)));
- 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 */
+ 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 */
}
- pc++;
- continue;
- }
- case OP_SETLIST: {
+ )
+ 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;
- L->top = L->ci->top;
+ 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++);
}
- if (c == 0) c = cast_int(*pc++);
- runtime_check(L, ttistable(ra));
+ 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-alloc it at once */
+ luaH_resizearray(L, h, last); /* pre-allocate it at once */
for (; n > 0; n--) {
TValue *val = ra+n;
- setobj2t(L, luaH_setnum(L, h, last--), val);
- luaC_barriert(L, h, val);
+ luaH_setint(L, h, last--, val);
+ luaC_barrierback(L, obj2gco(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: {
+ 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;
- CallInfo *ci = L->ci;
- int n = cast_int(ci->base - ci->func) - cl->p->numparams - 1;
- if (b == LUA_MULTRET) {
+ 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 */
- b = n;
L->top = ra + n;
}
for (j = 0; j < b; j++) {
if (j < n) {
- setobjs2s(L, ra + j, ci->base - n + j);
+ setobjs2s(L, ra + j, base - n + j);
}
else {
setnilvalue(ra + j);
}
}
- continue;
- }
+ )
+ vmcase(OP_EXTRAARG,
+ lua_assert(0);
+ )
}
}
}