/*
** Similar to 'tonumber', but does not attempt to convert strings and
** ensure correct precision (no extra bits). Used in comparisons.
*/
static int tofloat (const TValue *obj, lua_Number *n) {
if (ttisfloat(obj)) *n = fltvalue(obj);
else if (ttisinteger(obj)) {
volatile lua_Number x = cast_num(ivalue(obj)); /* avoid extra precision */
*n = x;
}
else {
*n = 0; /* to avoid warnings */
return 0;
}
return 1;
}
/*
** Main operation less than or equal to; return 'l <= r'. If it needs
** a metamethod and there is no '__le', try '__lt', based on
** l <= r iff !(r < l) (assuming a total order). If the metamethod
** yields during this substitution, the continuation has to know
** about it (to negate the result of r<l); bit CIST_LEQ in the call
** status keeps that information.
*/
int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
int res;
#ifndef _KERNEL
if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
return LEnum(l, r);
#else /* _KERNEL */
if (ttisinteger(l) && ttisinteger(r)) /* both operands are integers? */
return (ivalue(l) <= ivalue(r));
#endif /* _KERNEL */
else if (ttisstring(l) && ttisstring(r)) /* both are strings? */
return l_strcmp(tsvalue(l), tsvalue(r)) <= 0;
else if ((res = luaT_callorderTM(L, l, r, TM_LE)) >= 0) /* try 'le' */
return res;
else { /* try 'lt': */
L->ci->callstatus |= CIST_LEQ; /* mark it is doing 'lt' for 'le' */
res = luaT_callorderTM(L, r, l, TM_LT);
L->ci->callstatus ^= CIST_LEQ; /* clear mark */
if (res < 0)
luaG_ordererror(L, l, r);
return !res; /* result is negated */
}
}
void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
TValue *res) {
switch (op) {
case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
case LUA_OPSHL: case LUA_OPSHR:
case LUA_OPBNOT: { /* operate only on integers */
lua_Integer i1; lua_Integer i2;
if (tointeger(p1, &i1) && tointeger(p2, &i2)) {
setivalue(res, intarith(L, op, i1, i2));
return;
}
else break; /* go to the end */
}
case LUA_OPDIV: case LUA_OPPOW: { /* operate only on floats */
lua_Number n1; lua_Number n2;
if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
setfltvalue(res, numarith(L, op, n1, n2));
return;
}
else break; /* go to the end */
}
default: { /* other operations */
lua_Number n1; lua_Number n2;
if (ttisinteger(p1) && ttisinteger(p2)) {
setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
return;
}
else if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
setfltvalue(res, numarith(L, op, n1, n2));
return;
}
else break; /* go to the end */
}
}
/* could not perform raw operation; try metamethod */
lua_assert(L != NULL); /* should not fail when folding (compile time) */
luaT_trybinTM(L, p1, p2, res, cast(TMS, op - LUA_OPADD + TM_ADD));
}
/*
** Try to convert a value to a float. The float case is already handled
** by the macro 'tonumber'.
*/
int luaV_tonumber_ (const TValue *obj, lua_Number *n) {
TValue v;
if (ttisinteger(obj)) {
*n = cast_num(ivalue(obj));
return 1;
}
else if (cvt2num(obj) && /* string convertible to number? */
luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) {
*n = nvalue(&v); /* convert result of 'luaO_str2num' to a float */
return 1;
}
else
return 0; /* conversion failed */
}
static int addk (FuncState *fs, TValue *k, TValue *v) {
lua_State *L = fs->L;
TValue *idx = luaH_set(L, fs->h, k);
Proto *f = fs->f;
int oldsize = f->sizek;
if (ttype(idx)==LUA_TNUMBER) {
luai_normalize(idx);
lua_assert( ttype(idx)==LUA_TINT ); /* had no fraction */
}
if (ttisint(idx)) {
lua_assert(luaO_rawequalObj(&fs->f->k[ivalue(idx)], v));
return cast_int(ivalue(idx));
}
else { /* constant not found; create a new entry */
setivalue(idx, fs->nk);
luaM_growvector(L, f->k, fs->nk, f->sizek, TValue,
MAXARG_Bx, "constant table overflow");
while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
setobj(L, &f->k[fs->nk], v);
luaC_barrier(L, f, v);
return fs->nk++;
}
}
/*
** returns the index for `key' if `key' is an appropriate key to live in
** the array part of the table, -1 otherwise.
**
** Anything <=0 is taken as not being in the array part.
*/
static int arrayindex (const TValue *key, int max) {
lua_Integer i;
switch( ttype(key) ) {
#ifdef LUA_TINT
case LUA_TINT:
i= ivalue(key);
break;
#endif
case LUA_TNUMBER:
if (tt_integer_valued(key,&i)) break;
default:
return -1; /* not to be used as array index */
}
return (i <= max) ? cast_int(i) : -1;
}
/*=============================+
* evaluate -- Generic evaluator
*============================*/
PVALUE
evaluate (PNODE node, SYMTAB stab, BOOLEAN *eflg)
{
if (prog_trace) {
trace_out("%d: ", iline(node)+1);
trace_pnode(node);
trace_endl();
}
if (iistype(node, IIDENT))
return evaluate_iden(node, stab, eflg);
if (iistype(node, IBCALL))
return evaluate_func(node, stab, eflg);
if (iistype(node, IFCALL))
return evaluate_ufunc(node, stab, eflg);
*eflg = FALSE;
if (iistype(node, IICONS))
return copy_pvalue(ivalue(node));
if (iistype(node, ISCONS))
return copy_pvalue(ivalue(node));
if (iistype(node, IFCONS))
return copy_pvalue(ivalue(node));
*eflg = TRUE;
return NULL;
}
/*
** returns the index of a 'key' for table traversals. First goes all
** elements in the array part, then elements in the hash part. The
** beginning of a traversal is signaled by 0.
*/
static unsigned int findindex (lua_State *L, Table *t, TValue *key,
unsigned int asize) {
unsigned int i;
if (ttisnil(key)) return 0; /* first iteration */
i = ttisinteger(key) ? arrayindex(ivalue(key)) : 0;
if (i != 0 && i <= asize) /* is 'key' inside array part? */
return i; /* yes; that's the index */
else {
const TValue *n = getgeneric(t, key);
if (unlikely(isabstkey(n)))
luaG_runerror(L, "invalid key to 'next'"); /* key not found */
i = cast_int(nodefromval(n) - gnode(t, 0)); /* key index in hash table */
/* hash elements are numbered after array ones */
return (i + 1) + asize;
}
}
/*
** Try to "constant-fold" an operation; return 1 iff successful
*/
static int constfolding (FuncState *fs, int op, expdesc *e1, expdesc *e2) {
TValue v1, v2, res;
if (!tonumeral(e1, &v1) || !tonumeral(e2, &v2) || !validop(op, &v1, &v2))
return 0; /* non-numeric operands or not safe to fold */
luaO_arith(fs->ls->L, op, &v1, &v2, &res);
if (ttisinteger(&res)) {
e1->k = VKINT;
e1->u.ival = ivalue(&res);
}
else {
lua_Number n = fltvalue(&res);
if (luai_numisnan(n) || isminuszero(n))
return 0; /* folds neither NaN nor -0 */
e1->k = VKFLT;
e1->u.nval = n;
}
return 1;
}
/*
** return false if folding can raise an error
*/
static int validop (int op, TValue *v1, TValue *v2) {
lua_Number a, b;
lua_Integer i;
cast_void(a); cast_void(b); /* macro may not use its arguments */
if (luai_numinvalidop(op, (cast_void(tonumber(v1, &a)), a),
(cast_void(tonumber(v2, &b)), b)))
return 0;
switch (op) {
case LUA_OPIDIV: /* division by 0 and conversion errors */
return (tointeger(v1, &i) && tointeger(v2, &i) && i != 0);
case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: /* conversion errors */
return (tointeger(v1, &i) && tointeger(v2, &i));
case LUA_OPMOD: /* integer module by 0 */
return !(ttisinteger(v1) && ttisinteger(v2) && ivalue(v2) == 0);
default: return 1; /* everything else is valid */
}
}
/*
** Try to convert a value to a float. Check 'isinteger' first, because
** in general the float case is already handled by the macro 'tonumber'.
*/
int luaV_tonumber_ (const TValue *obj, lua_Number *n) {
TValue v;
again:
if (ttisinteger(obj)) {
*n = cast_num(ivalue(obj));
return 1;
}
else if (ttisfloat(obj)) {
*n = fltvalue(obj);
return 1;
}
else if (cvt2num(obj) && /* string convertible to number? */
luaO_str2num(svalue(obj), &v) == tsvalue(obj)->len + 1) {
obj = &v;
goto again; /* convert result from 'luaO_str2num' to a float */
}
return 0; /* conversion failed */
}
static int read_numeral (LexState *ls, SemInfo *seminfo) {
TValue obj;
int first = ls->current;
lua_assert(lisdigit(ls->current));
save_and_next(ls);
if (first == '0')
check_next2(ls, "xX"); /* hexadecimal? */
for (;;) {
if (lisxdigit(ls->current))
save_and_next(ls);
else break;
}
save(ls, '\0');
if (!buff2num(ls->buff, &obj)) /* format error? */
lexerror(ls, "malformed number", TK_INT);
lua_assert(ttisinteger(&obj));
seminfo->i = ivalue(&obj);
return TK_INT;
}
int luaV_tostring (lua_State *L, StkId obj) {
if (!ttisnumber(obj))
return 0;
else {
char buff[MAXNUMBER2STR];
size_t len;
if (ttisinteger(obj))
len = lua_integer2str(buff, ivalue(obj));
else {
len = lua_number2str(buff, fltvalue(obj));
if (strspn(buff, "-0123456789") == len) { /* look like an integer? */
buff[len++] = '.'; /* add a '.0' */
buff[len++] = '0';
buff[len] = '\0';
}
}
setsvalue2s(L, obj, luaS_newlstr(L, buff, len));
return 1;
}
}
/*
** Check whether key 'k1' is equal to the key in node 'n2'.
** This equality is raw, so there are no metamethods. Floats
** with integer values have been normalized, so integers cannot
** be equal to floats. It is assumed that 'eqshrstr' is simply
** pointer equality, so that short strings are handled in the
** default case.
*/
static int equalkey (const TValue *k1, const Node *n2) {
if (rawtt(k1) != keytt(n2)) /* not the same variants? */
return 0; /* cannot be same key */
switch (ttypetag(k1)) {
case LUA_TNIL:
return 1;
case LUA_TNUMINT:
return (ivalue(k1) == keyival(n2));
case LUA_TNUMFLT:
return luai_numeq(fltvalue(k1), fltvalueraw(keyval(n2)));
case LUA_TBOOLEAN:
return bvalue(k1) == bvalueraw(keyval(n2));
case LUA_TLIGHTUSERDATA:
return pvalue(k1) == pvalueraw(keyval(n2));
case LUA_TLCF:
return fvalue(k1) == fvalueraw(keyval(n2));
case LUA_TLNGSTR:
return luaS_eqlngstr(tsvalue(k1), keystrval(n2));
default:
return gcvalue(k1) == gcvalueraw(keyval(n2));
}
}
static void DumpConstants(const Proto* f, DumpState* D)
{
int i,n=f->sizek;
DumpInt(n,D);
for (i=0; i<n; i++)
{
const TValue* o=&f->k[i];
DumpChar(ttype(o),D);
switch (ttype(o))
{
case LUA_TNIL:
break;
case LUA_TBOOLEAN:
DumpChar(bvalue(o),D);
break;
#ifdef LUA_TINT
case LUA_TINT:
DumpInteger(ivalue(o),D);
break;
case LUA_TNUMBER:
DumpNumber(nvalue_fast(o),D);
break;
#else
case LUA_TNUMBER:
DumpNumber(nvalue(o),D);
break;
#endif
case LUA_TSTRING:
DumpString(rawtsvalue(o),D);
break;
default:
lua_assert(0); /* cannot happen */
break;
}
}
n=f->sizep;
DumpInt(n,D);
for (i=0; i<n; i++) DumpFunction(f->p[i],f->source,D);
}
static pointer plugin_function(scheme *sc, pointer args) {
printf("this is a plugin!\n");
/* first argument is an integer */
long i = ivalue(car(args));
printf("the first argument is %d\n", i);
/* pop first argument using cdr */
args = cdr(args);
/* second argument is a string */
char *str = string_value(car(args));
printf("the second argument is %s\n", str);
/* pop the argument */
args = cdr(args);
/* second argument is a float*/
SPFLOAT flt = rvalue(car(args));
printf("the third argument is %g\n", flt);
/* return a float */
return mk_real(sc, 0.2468);
}
int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
int res;
int tl= ttype(l);
if (tl == ttype(r)) {
switch(tl) {
#ifdef LUA_TINT
case LUA_TINT:
return ivalue(l) < ivalue(r);
#endif
case LUA_TNUMBER:
#ifdef LNUM_COMPLEX
if ( (nvalue_img_fast(l)!=0) || (nvalue_img_fast(r)!=0) )
error_complex( L, l, r );
#endif
return luai_numlt(nvalue_fast(l), nvalue_fast(r));
case LUA_TSTRING:
return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
}
if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
return res;
/* fall through to 'luaG_ordererror()' */
}
#ifdef LUA_TINT
else if (ttype_ext(l) == ttype_ext(r)) {
lua_Integer tmp;
/* Avoid accuracy losing casts: if 'r' is integer by value, do comparisons
* in integer realm. Only otherwise cast 'l' to FP (which might change its
* value).
*/
# ifdef LNUM_COMPLEX
if ( (nvalue_img(l)!=0) || (nvalue_img(r)!=0) )
error_complex( L, l, r );
# endif
if (tl==LUA_TINT) { /* l:int, r:num */
return tt_integer_valued(r,&tmp) ? (ivalue(l) < tmp)
: luai_numlt( cast_num(ivalue(l)), nvalue_fast(r) );
} else { /* l:num, r:int */
return tt_integer_valued(l,&tmp) ? (tmp < ivalue(r))
: luai_numlt( nvalue_fast(l), cast_num(ivalue(r)) );
}
}
#endif
return luaG_ordererror(L, l, r);
}
static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
int res;
int tl= ttype(l);
if (tl == ttype(r)) {
switch(tl) {
#ifdef LUA_TINT
case LUA_TINT:
return ivalue(l) <= ivalue(r);
#endif
case LUA_TNUMBER:
#ifdef LNUM_COMPLEX
if ( (nvalue_img_fast(l)!=0) || (nvalue_img_fast(r)!=0) )
error_complex( L, l, r );
#endif
return luai_numle(nvalue_fast(l), nvalue_fast(r));
case LUA_TSTRING:
return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
}
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;
/* fall through to 'luaG_ordererror()' */
}
#ifdef LUA_TINT
else if (ttype_ext(l) == ttype_ext(r)) {
lua_Integer tmp;
# ifdef LNUM_COMPLEX
if ( (nvalue_img(l)!=0) || (nvalue_img(r)!=0) )
error_complex( L, l, r );
# endif
if (tl==LUA_TINT) { /* l:int, r:num */
return tt_integer_valued(r,&tmp) ? (ivalue(l) <= tmp)
: luai_numle( cast_num(ivalue(l)), nvalue_fast(r) );
} else { /* l:num, r:int */
return tt_integer_valued(l,&tmp) ? (tmp <= ivalue(r))
: luai_numle( nvalue_fast(l), cast_num(ivalue(r)) );
}
}
#endif
return luaG_ordererror(L, l, r);
}
/*
** try to convert a value to an integer, rounding according to 'mode':
** mode == 0: accepts only integral values
** mode == 1: takes the floor of the number
** mode == 2: takes the ceil of the number
*/
int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode) {
TValue v;
again:
if (ttisfloat(obj)) {
lua_Number n = fltvalue(obj);
lua_Number f = l_floor(n);
if (n != f) { /* not an integral value? */
if (mode == 0) return 0; /* fails if mode demands integral value */
else if (mode > 1) /* needs ceil? */
f += 1; /* convert floor to ceil (remember: n != f) */
}
return lua_numbertointeger(f, p);
}
else if (ttisinteger(obj)) {
*p = ivalue(obj);
return 1;
}
else if (cvt2num(obj) &&
luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) {
obj = &v;
goto again; /* convert result from 'luaO_str2num' to an integer */
}
return 0; /* conversion failed */
}
Term::operator const List&() const
{
ASSERT(type(f_LIST));
return *m_lists[ivalue()];
}
/*
** try to convert a value to an integer, rounding according to 'mode':
** mode == 0: accepts only integral values
** mode == 1: takes the floor of the number
** mode == 2: takes the ceil of the number
*/
int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode) {
TValue v;
again:
#ifndef _KERNEL
if (ttisfloat(obj)) {
lua_Number n = fltvalue(obj);
lua_Number f = l_floor(n);
if (n != f) { /* not an integral value? */
if (mode == 0) return 0; /* fails if mode demands integral value */
else if (mode > 1) /* needs ceil? */
f += 1; /* convert floor to ceil (remember: n != f) */
}
return lua_numbertointeger(f, p);
}
else if (ttisinteger(obj)) {
#else /* _KERNEL */
if (ttisinteger(obj)) {
UNUSED(mode);
#endif
*p = ivalue(obj);
return 1;
}
else if (cvt2num(obj) &&
luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) {
obj = &v;
goto again; /* convert result from 'luaO_str2num' to an integer */
}
return 0; /* conversion failed */
}
#ifndef _KERNEL
/*
** Try to convert a 'for' limit to an integer, preserving the
** semantics of the loop.
** (The following explanation assumes a non-negative step; it is valid
** for negative steps mutatis mutandis.)
** If the limit can be converted to an integer, rounding down, that is
** it.
** Otherwise, check whether the limit can be converted to a number. If
** the number is too large, it is OK to set the limit as LUA_MAXINTEGER,
** which means no limit. If the number is too negative, the loop
** should not run, because any initial integer value is larger than the
** limit. So, it sets the limit to LUA_MININTEGER. 'stopnow' corrects
** the extreme case when the initial value is LUA_MININTEGER, in which
** case the LUA_MININTEGER limit would still run the loop once.
*/
static int forlimit (const TValue *obj, lua_Integer *p, lua_Integer step,
int *stopnow) {
*stopnow = 0; /* usually, let loops run */
if (!luaV_tointeger(obj, p, (step < 0 ? 2 : 1))) { /* not fit in integer? */
lua_Number n; /* try to convert to float */
if (!tonumber(obj, &n)) /* cannot convert to float? */
return 0; /* not a number */
if (luai_numlt(0, n)) { /* if true, float is larger than max integer */
*p = LUA_MAXINTEGER;
if (step < 0) *stopnow = 1;
}
else { /* float is smaller than min integer */
*p = LUA_MININTEGER;
if (step >= 0) *stopnow = 1;
}
}
return 1;
}
Term::operator const Double&() const
{
ASSERT(type(f_DOUBLE));
return *m_doubles[ivalue()];
}
/* Note: if called for unary operations, 'rc'=='rb'.
*/
static void Arith (lua_State *L, StkId ra, const TValue *rb,
const TValue *rc, TMS op) {
TValue tempb, tempc;
const TValue *b, *c;
lua_Number nb,nc;
if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
(c = luaV_tonumber(rc, &tempc)) != NULL) {
/* Keep integer arithmetics in the integer realm, if possible.
*/
#ifdef LUA_TINT
if (ttisint(b) && ttisint(c)) {
lua_Integer ib = ivalue(b), ic = ivalue(c);
lua_Integer *ri = &ra->value.i;
ra->tt= LUA_TINT; /* part of 'setivalue(ra)' */
switch (op) {
case TM_ADD: if (try_addint( ri, ib, ic)) return; break;
case TM_SUB: if (try_subint( ri, ib, ic)) return; break;
case TM_MUL: if (try_mulint( ri, ib, ic)) return; break;
case TM_DIV: if (try_divint( ri, ib, ic)) return; break;
case TM_MOD: if (try_modint( ri, ib, ic)) return; break;
case TM_POW: if (try_powint( ri, ib, ic)) return; break;
case TM_UNM: if (try_unmint( ri, ib)) return; break;
default: lua_assert(0);
}
}
#endif
/* Fallback to floating point, when leaving range. */
#ifdef LNUM_COMPLEX
if ((nvalue_img(b)!=0) || (nvalue_img(c)!=0)) {
lua_Complex r;
if (op==TM_UNM) {
r= -nvalue_complex_fast(b); /* never an integer (or scalar) */
setnvalue_complex_fast( ra, r );
} else {
lua_Complex bb= nvalue_complex(b), cc= nvalue_complex(c);
switch (op) {
case TM_ADD: r= bb + cc; break;
case TM_SUB: r= bb - cc; break;
case TM_MUL: r= bb * cc; break;
case TM_DIV: r= bb / cc; break;
case TM_MOD:
luaG_runerror(L, "attempt to use %% on complex numbers"); /* no return */
case TM_POW: r= luai_vectpow( bb, cc ); break;
default: lua_assert(0); r=0;
}
setnvalue_complex( ra, r );
}
return;
}
#endif
nb = nvalue(b); nc = nvalue(c);
switch (op) {
case TM_ADD: setnvalue(ra, luai_numadd(nb, nc)); return;
case TM_SUB: setnvalue(ra, luai_numsub(nb, nc)); return;
case TM_MUL: setnvalue(ra, luai_nummul(nb, nc)); return;
case TM_DIV: setnvalue(ra, luai_numdiv(nb, nc)); return;
case TM_MOD: setnvalue(ra, luai_nummod(nb, nc)); return;
case TM_POW: setnvalue(ra, luai_numpow(nb, nc)); return;
case TM_UNM: setnvalue(ra, luai_numunm(nb)); return;
default: lua_assert(0);
}
}
/* Either operand not a number */
if (!call_binTM(L, rb, rc, ra, op))
luaG_aritherror(L, rb, rc);
}
Term::operator SysData*() const
{
ASSERT(type(f_SYSDATA));
return *m_sysd[ivalue()];
}
inline Term::operator Var() const
{
ASSERT(type(f_VAR));
return Var(ivalue());
}
inline Term::operator Int() const
{
ASSERT(type(f_INT));
return Int(ivalue());
}
/*
inline Term::operator kstring() const
{
ASSERT(type(f_ATOM));
return kstring(ivalue());
}
*/
inline Term::operator CCP() const
{
ASSERT(type(f_ATOM));
return kstring(ivalue());
}
inline kstring Term::kstr() const
{
ASSERT(type(f_ATOM));
return kstring(ivalue());
}
long Cell::toInteger() const
{
return ivalue(m_value);
}