void prefix(int /* UnOpr */ op, expdesc e, int line) {
expdesc e2 = new expdesc();
e2.init(LexState.VKNUM, 0);
switch (op) {
case LexState.OPR_MINUS:
{
if (e.isnumeral()) /* minus constant? */ e.u.setNval(e.u.nval().neg()); /* fold it */
else {
this.exp2anyreg(e);
this.codearith(OP_UNM, e, e2, line);
}
break;
}
case LexState.OPR_NOT:
this.codenot(e);
break;
case LexState.OPR_LEN:
{
this.exp2anyreg(e); /* cannot operate on constants */
this.codearith(OP_LEN, e, e2, line);
break;
}
default:
_assert(false);
}
}
int exp2RK(expdesc e) {
this.exp2val(e);
switch (e.k) {
case LexState.VTRUE:
case LexState.VFALSE:
case LexState.VNIL:
{
if (this.nk <= MAXINDEXRK) {
/* constant fit in RK operand? */
e.u.info = (e.k == LexState.VNIL) ? this.nilK() : this.boolK((e.k == LexState.VTRUE));
e.k = LexState.VK;
return RKASK(e.u.info);
} else break;
}
case LexState.VKNUM:
{
e.u.info = this.numberK(e.u.nval());
e.k = LexState.VK;
/* go through */
}
case LexState.VK:
{
if (e.u.info <= MAXINDEXRK) /* constant fit in argC? */ return RKASK(e.u.info);
else break;
}
default:
break;
}
/* not a constant in the right range: put it in a register */
return this.exp2anyreg(e);
}
void setoneret(expdesc e) {
if (e.k == LexState.VCALL) {
/* expression is an open function call? */
e.k = LexState.VNONRELOC;
e.u.info = GETARG_A(this.getcode(e));
} else if (e.k == LexState.VVARARG) {
SETARG_B(this.getcodePtr(e), 2);
e.k = LexState.VRELOCABLE; /* can relocate its simple result */
}
}
void indexed(expdesc t, expdesc k) {
t.u.ind_t = (short) t.u.info;
t.u.ind_idx = (short) this.exp2RK(k);
LuaC._assert(t.k == LexState.VUPVAL || vkisinreg(t.k));
t.u.ind_vt = (short) ((t.k == LexState.VUPVAL) ? LexState.VUPVAL : LexState.VLOCAL);
t.k = LexState.VINDEXED;
}
void infix(int /* BinOpr */ op, expdesc v) {
switch (op) {
case LexState.OPR_AND:
{
this.goiftrue(v);
break;
}
case LexState.OPR_OR:
{
this.goiffalse(v);
break;
}
case LexState.OPR_CONCAT:
{
this.exp2nextreg(v); /* operand must be on the `stack' */
break;
}
case LexState.OPR_ADD:
case LexState.OPR_SUB:
case LexState.OPR_MUL:
case LexState.OPR_DIV:
case LexState.OPR_MOD:
case LexState.OPR_POW:
{
if (!v.isnumeral()) this.exp2RK(v);
break;
}
default:
{
this.exp2RK(v);
break;
}
}
}
void codenot(expdesc e) {
this.dischargevars(e);
switch (e.k) {
case LexState.VNIL:
case LexState.VFALSE:
{
e.k = LexState.VTRUE;
break;
}
case LexState.VK:
case LexState.VKNUM:
case LexState.VTRUE:
{
e.k = LexState.VFALSE;
break;
}
case LexState.VJMP:
{
this.invertjump(e);
break;
}
case LexState.VRELOCABLE:
case LexState.VNONRELOC:
{
this.discharge2anyreg(e);
this.freeexp(e);
e.u.info = this.codeABC(OP_NOT, 0, e.u.info, 0);
e.k = LexState.VRELOCABLE;
break;
}
default:
{
_assert(false); /* cannot happen */
break;
}
}
/* interchange true and false lists */
{
int temp = e.f.i;
e.f.i = e.t.i;
e.t.i = temp;
}
this.removevalues(e.f.i);
this.removevalues(e.t.i);
}
boolean constfolding(int op, expdesc e1, expdesc e2) {
LuaValue v1, v2, r;
if (!e1.isnumeral() || !e2.isnumeral()) return false;
if ((op == OP_DIV || op == OP_MOD) && e2.u.nval().eq_b(LuaValue.ZERO))
return false; /* do not attempt to divide by 0 */
v1 = e1.u.nval();
v2 = e2.u.nval();
switch (op) {
case OP_ADD:
r = v1.add(v2);
break;
case OP_SUB:
r = v1.sub(v2);
break;
case OP_MUL:
r = v1.mul(v2);
break;
case OP_DIV:
r = v1.div(v2);
break;
case OP_MOD:
r = v1.mod(v2);
break;
case OP_POW:
r = v1.pow(v2);
break;
case OP_UNM:
r = v1.neg();
break;
case OP_LEN:
// r = v1.len();
// break;
return false; /* no constant folding for 'len' */
default:
_assert(false);
r = null;
break;
}
if (Double.isNaN(r.todouble())) return false; /* do not attempt to produce NaN */
e1.u.setNval(r);
return true;
}
void self(expdesc e, expdesc key) {
int func;
this.exp2anyreg(e);
this.freeexp(e);
func = this.freereg;
this.reserveregs(2);
this.codeABC(OP_SELF, func, e.u.info, this.exp2RK(key));
this.freeexp(key);
e.u.info = func;
e.k = LexState.VNONRELOC;
}
void exp2reg(expdesc e, int reg) {
this.discharge2reg(e, reg);
if (e.k == LexState.VJMP) this.concat(e.t, e.u.info); /* put this jump in `t' list */
if (e.hasjumps()) {
int _final; /* position after whole expression */
int p_f = LexState.NO_JUMP; /* position of an eventual LOAD false */
int p_t = LexState.NO_JUMP; /* position of an eventual LOAD true */
if (this.need_value(e.t.i) || this.need_value(e.f.i)) {
int fj = (e.k == LexState.VJMP) ? LexState.NO_JUMP : this.jump();
p_f = this.code_label(reg, 0, 1);
p_t = this.code_label(reg, 1, 0);
this.patchtohere(fj);
}
_final = this.getlabel();
this.patchlistaux(e.f.i, _final, reg, p_f);
this.patchlistaux(e.t.i, _final, reg, p_t);
}
e.f.i = e.t.i = LexState.NO_JUMP;
e.u.info = reg;
e.k = LexState.VNONRELOC;
}
static int singlevaraux(FuncState fs, LuaString n, expdesc var, int base) {
if (fs == null) /* no more levels? */ return LexState.VVOID; /* default is global */
int v = fs.searchvar(n); /* look up at current level */
if (v >= 0) {
var.init(LexState.VLOCAL, v);
if (base == 0) fs.markupval(v); /* local will be used as an upval */
return LexState.VLOCAL;
} else {
/* not found at current level; try upvalues */
int idx = fs.searchupvalue(n); /* try existing upvalues */
if (idx < 0) {
/* not found? */
if (singlevaraux(fs.prev, n, var, 0) == LexState.VVOID) /* try upper levels */
return LexState.VVOID; /* not found; is a global */
/* else was LOCAL or UPVAL */
idx = fs.newupvalue(n, var); /* will be a new upvalue */
}
var.init(LexState.VUPVAL, idx);
return LexState.VUPVAL;
}
}
int exp2anyreg(expdesc e) {
this.dischargevars(e);
if (e.k == LexState.VNONRELOC) {
if (!e.hasjumps()) return e.u.info; /* exp is already in a register */
if (e.u.info >= this.nactvar) {
/* reg. is not a local? */
this.exp2reg(e, e.u.info); /* put value on it */
return e.u.info;
}
}
this.exp2nextreg(e); /* default */
return e.u.info;
}
void dischargevars(expdesc e) {
switch (e.k) {
case LexState.VLOCAL:
{
e.k = LexState.VNONRELOC;
break;
}
case LexState.VUPVAL:
{
e.u.info = this.codeABC(OP_GETUPVAL, 0, e.u.info, 0);
e.k = LexState.VRELOCABLE;
break;
}
case LexState.VINDEXED:
{
int op = OP_GETTABUP; /* assume 't' is in an upvalue */
this.freereg(e.u.ind_idx);
if (e.u.ind_vt == LexState.VLOCAL) {
/* 't' is in a register? */
this.freereg(e.u.ind_t);
op = OP_GETTABLE;
}
e.u.info = this.codeABC(op, 0, e.u.ind_t, e.u.ind_idx);
e.k = LexState.VRELOCABLE;
break;
}
case LexState.VVARARG:
case LexState.VCALL:
{
this.setoneret(e);
break;
}
default:
break; /* there is one value available (somewhere) */
}
}
void codecomp(int /* OpCode */ op, int cond, expdesc e1, expdesc e2) {
int o1 = this.exp2RK(e1);
int o2 = this.exp2RK(e2);
this.freeexp(e2);
this.freeexp(e1);
if (cond == 0 && op != OP_EQ) {
int temp; /* exchange args to replace by `<' or `<=' */
temp = o1;
o1 = o2;
o2 = temp; /* o1 <==> o2 */
cond = 1;
}
e1.u.info = this.condjump(op, cond, o1, o2);
e1.k = LexState.VJMP;
}
void codearith(int op, expdesc e1, expdesc e2, int line) {
if (constfolding(op, e1, e2)) return;
else {
int o2 = (op != OP_UNM && op != OP_LEN) ? this.exp2RK(e2) : 0;
int o1 = this.exp2RK(e1);
if (o1 > o2) {
this.freeexp(e1);
this.freeexp(e2);
} else {
this.freeexp(e2);
this.freeexp(e1);
}
e1.u.info = this.codeABC(op, 0, o1, o2);
e1.k = LexState.VRELOCABLE;
fixline(line);
}
}
void discharge2reg(expdesc e, int reg) {
this.dischargevars(e);
switch (e.k) {
case LexState.VNIL:
{
this.nil(reg, 1);
break;
}
case LexState.VFALSE:
case LexState.VTRUE:
{
this.codeABC(OP_LOADBOOL, reg, (e.k == LexState.VTRUE ? 1 : 0), 0);
break;
}
case LexState.VK:
{
this.codeABx(OP_LOADK, reg, e.u.info);
break;
}
case LexState.VKNUM:
{
this.codeABx(OP_LOADK, reg, this.numberK(e.u.nval()));
break;
}
case LexState.VRELOCABLE:
{
InstructionPtr pc = this.getcodePtr(e);
SETARG_A(pc, reg);
break;
}
case LexState.VNONRELOC:
{
if (reg != e.u.info) this.codeABC(OP_MOVE, reg, e.u.info, 0);
break;
}
default:
{
_assert(e.k == LexState.VVOID || e.k == LexState.VJMP);
return; /* nothing to do... */
}
}
e.u.info = reg;
e.k = LexState.VNONRELOC;
}
void posfix(int op, expdesc e1, expdesc e2, int line) {
switch (op) {
case LexState.OPR_AND:
{
_assert(e1.t.i == LexState.NO_JUMP); /* list must be closed */
this.dischargevars(e2);
this.concat(e2.f, e1.f.i);
// *e1 = *e2;
e1.setvalue(e2);
break;
}
case LexState.OPR_OR:
{
_assert(e1.f.i == LexState.NO_JUMP); /* list must be closed */
this.dischargevars(e2);
this.concat(e2.t, e1.t.i);
// *e1 = *e2;
e1.setvalue(e2);
break;
}
case LexState.OPR_CONCAT:
{
this.exp2val(e2);
if (e2.k == LexState.VRELOCABLE && GET_OPCODE(this.getcode(e2)) == OP_CONCAT) {
_assert(e1.u.info == GETARG_B(this.getcode(e2)) - 1);
this.freeexp(e1);
SETARG_B(this.getcodePtr(e2), e1.u.info);
e1.k = LexState.VRELOCABLE;
e1.u.info = e2.u.info;
} else {
this.exp2nextreg(e2); /* operand must be on the 'stack' */
this.codearith(OP_CONCAT, e1, e2, line);
}
break;
}
case LexState.OPR_ADD:
this.codearith(OP_ADD, e1, e2, line);
break;
case LexState.OPR_SUB:
this.codearith(OP_SUB, e1, e2, line);
break;
case LexState.OPR_MUL:
this.codearith(OP_MUL, e1, e2, line);
break;
case LexState.OPR_DIV:
this.codearith(OP_DIV, e1, e2, line);
break;
case LexState.OPR_MOD:
this.codearith(OP_MOD, e1, e2, line);
break;
case LexState.OPR_POW:
this.codearith(OP_POW, e1, e2, line);
break;
case LexState.OPR_EQ:
this.codecomp(OP_EQ, 1, e1, e2);
break;
case LexState.OPR_NE:
this.codecomp(OP_EQ, 0, e1, e2);
break;
case LexState.OPR_LT:
this.codecomp(OP_LT, 1, e1, e2);
break;
case LexState.OPR_LE:
this.codecomp(OP_LE, 1, e1, e2);
break;
case LexState.OPR_GT:
this.codecomp(OP_LT, 0, e1, e2);
break;
case LexState.OPR_GE:
this.codecomp(OP_LE, 0, e1, e2);
break;
default:
_assert(false);
}
}
void exp2anyregup(expdesc e) {
if (e.k != LexState.VUPVAL || e.hasjumps()) exp2anyreg(e);
}
void exp2val(expdesc e) {
if (e.hasjumps()) this.exp2anyreg(e);
else this.dischargevars(e);
}