767 lines
23 KiB
C
767 lines
23 KiB
C
/*
|
|
** $Id: lvm.c,v 2.63.1.5 2011/08/17 20:43:11 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;
|
|
TValue temp;
|
|
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);
|
|
h->flags = 0;
|
|
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;
|
|
}
|
|
/* else repeat with `tm' */
|
|
setobj(L, &temp, tm); /* avoid pointing inside table (may rehash) */
|
|
t = &temp;
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|