lvm.c File Reference

#include "lprefix.h"
#include <float.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#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"

Go to the source code of this file.

Macros
#define	lvm_c
#define	LUA_CORE
#define	MAXTAGLOOP   2000
#define	NBM   (l_mathlim(MANT_DIG))
#define	tostring(L, o)    (ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1)))
#define	isemptystr(o)   (ttisshrstring(o) && tsvalue(o)->shrlen == 0)
#define	NBITS   cast_int(sizeof(lua_Integer) * CHAR_BIT)
#define	RA(i)   (base+GETARG_A(i))
#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)
#define	RKC(i)
#define	dojump(ci, i, e)
#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)
#define	vmfetch()
#define	vmdispatch(o)   switch(o)
#define	vmcase(l)   case l:
#define	vmbreak   break
#define	gettableProtected(L, t, k, v)
#define	settableProtected(L, t, k, v)

Functions
int	luaV_tonumber_ (const TValue *obj, lua_Number *n)
int	luaV_tointeger (const TValue *obj, lua_Integer *p, int mode)
static int	forlimit (const TValue *obj, lua_Integer *p, lua_Integer step, int *stopnow)
void	luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val, const TValue *slot)
void	luaV_finishset (lua_State *L, const TValue *t, TValue *key, StkId val, const TValue *slot)
static int	l_strcmp (const TString *ls, const TString *rs)
static int	LTintfloat (lua_Integer i, lua_Number f)
static int	LEintfloat (lua_Integer i, lua_Number f)
static int	LTnum (const TValue *l, const TValue *r)
static int	LEnum (const TValue *l, const TValue *r)
int	luaV_lessthan (lua_State *L, const TValue *l, const TValue *r)
int	luaV_lessequal (lua_State *L, const TValue *l, const TValue *r)
int	luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2)
static void	copy2buff (StkId top, int n, char *buff)
void	luaV_concat (lua_State *L, int total)
void	luaV_objlen (lua_State *L, StkId ra, const TValue *rb)
lua_Integer	luaV_div (lua_State *L, lua_Integer m, lua_Integer n)
lua_Integer	luaV_mod (lua_State *L, lua_Integer m, lua_Integer n)
lua_Integer	luaV_shiftl (lua_Integer x, lua_Integer y)
static LClosure *	getcached (Proto *p, UpVal **encup, StkId base)
static void	pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base, StkId ra)
void	luaV_finishOp (lua_State *L)
void	luaV_execute (lua_State *L)

Macro Definition Documentation

checkGC

#define checkGC	(		L,
			c )

Value:

    { luaC_condGC(L, L->top = (c),  /* limit of live values */ \
                         Protect(L->top = ci->top));  /* restore top */ \
           luai_threadyield(L); }

Definition at line 749 of file lua-5.3.6/src/lvm.c.

#define checkGC(L,c)  \
    { luaC_condGC(L, L->top = (c),  /* limit of live values */ \
                         Protect(L->top = ci->top));  /* restore top */ \
           luai_threadyield(L); }

Referenced by luaV_execute().

dojump

#define dojump	(		ci,
			i,
			e )

Value:

  { 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; }

Definition at line 738 of file lua-5.3.6/src/lvm.c.

#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; }

Referenced by luaV_execute().

donextjump

#define donextjump

(

ci

)

{ i = *ci->u.l.savedpc; dojump(ci, i, 1); }

Definition at line 744 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

gettableProtected

#define gettableProtected	(		L,
			t,
			k,
			v )

Value:

  { const TValue *slot; \
  if (luaV_fastget(L,t,k,slot,luaH_get)) { setobj2s(L, v, slot); } \
  else Protect(luaV_finishget(L,t,k,v,slot)); }

Definition at line 774 of file lua-5.3.6/src/lvm.c.

#define gettableProtected(L,t,k,v)  { const TValue *slot; \
  if (luaV_fastget(L,t,k,slot,luaH_get)) { setobj2s(L, v, slot); } \
  else Protect(luaV_finishget(L,t,k,v,slot)); }

Referenced by luaV_execute().

isemptystr

#define isemptystr

(

o

)

(ttisshrstring(o) && tsvalue(o)->shrlen == 0)

Definition at line 457 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_concat().

LUA_CORE

#define LUA_CORE

Definition at line 8 of file lua-5.3.6/src/lvm.c.

lvm_c

#define lvm_c

Definition at line 7 of file lua-5.3.6/src/lvm.c.

MAXTAGLOOP

#define MAXTAGLOOP   2000

Definition at line 35 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_finishget(), and luaV_finishset().

NBITS

#define NBITS   cast_int(sizeof(lua_Integer) * CHAR_BIT)

Definition at line 588 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_shiftl().

NBM

#define NBM   (l_mathlim(MANT_DIG))

Definition at line 47 of file lua-5.3.6/src/lvm.c.

Protect

#define Protect

(

x

)

{ {x;}; base = ci->u.l.base; }

Definition at line 747 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

RA

#define RA

(

i

)

(base+GETARG_A(i))

Definition at line 728 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

RB

#define RB

(

i

)

check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))

Definition at line 729 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

RC

#define RC

(

i

)

check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))

Definition at line 730 of file lua-5.3.6/src/lvm.c.

RKB

#define RKB

(

i

)

Value:

    check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
    ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))

Definition at line 731 of file lua-5.3.6/src/lvm.c.

#define RKB(i)  check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
    ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))

Referenced by luaV_execute().

RKC

#define RKC

(

i

)

Value:

    check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
    ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))

Definition at line 733 of file lua-5.3.6/src/lvm.c.

#define RKC(i)  check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
    ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))

Referenced by luaV_execute().

settableProtected

#define settableProtected	(		L,
			t,
			k,
			v )

Value:

  { const TValue *slot; \
  if (!luaV_fastset(L,t,k,slot,luaH_get,v)) \
    Protect(luaV_finishset(L,t,k,v,slot)); }

Definition at line 780 of file lua-5.3.6/src/lvm.c.

#define settableProtected(L,t,k,v) { const TValue *slot; \
  if (!luaV_fastset(L,t,k,slot,luaH_get,v)) \
    Protect(luaV_finishset(L,t,k,v,slot)); }

Referenced by luaV_execute().

tostring

#define tostring	(		L,
			o )    (ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1)))

Definition at line 454 of file lua-5.3.6/src/lvm.c.

#define tostring(L,o)  \
    (ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1)))

Referenced by luaV_concat().

vmbreak

#define vmbreak   break

Definition at line 767 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

vmcase

#define vmcase

(

l

)

case l:

Definition at line 766 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

vmdispatch

#define vmdispatch

(

o

)

switch(o)

Definition at line 765 of file lua-5.3.6/src/lvm.c.

Referenced by luaV_execute().

vmfetch

#define vmfetch

(

)

Value:

  { \
  i = *(ci->u.l.savedpc++); \
  if (L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) \
    Protect(luaG_traceexec(L)); \
  ra = RA(i); /* WARNING: any stack reallocation invalidates 'ra' */ \
  lua_assert(base == ci->u.l.base); \
  lua_assert(base <= L->top && L->top < L->stack + L->stacksize); \
}

Definition at line 756 of file lua-5.3.6/src/lvm.c.

#define vmfetch()   { \
  i = *(ci->u.l.savedpc++); \
  if (L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) \
    Protect(luaG_traceexec(L)); \
  ra = RA(i); /* WARNING: any stack reallocation invalidates 'ra' */ \
  lua_assert(base == ci->u.l.base); \
  lua_assert(base <= L->top && L->top < L->stack + L->stacksize); \
}

Referenced by luaV_execute().

Function Documentation

copy2buff()

static void copy2buff ( StkId top, int n, char * buff )

static

Definition at line 460 of file lua-5.3.6/src/lvm.c.

                                                     {
  size_t tl = 0;  /* size already copied */
  do {
    size_t l = vslen(top - n);  /* length of string being copied */
    memcpy(buff + tl, svalue(top - n), l * sizeof(char));
    tl += l;
  } while (--n > 0);
}

References svalue, and vslen.

Referenced by luaV_concat().

forlimit()

static int forlimit ( const TValue * obj, lua_Integer * p, lua_Integer step, int * stopnow )

static

Definition at line 135 of file lua-5.3.6/src/lvm.c.

                                   {
  *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;
}

References luai_numlt, luaV_tointeger(), and tonumber.

Referenced by luaV_execute().

getcached()

static LClosure * getcached ( Proto * p, UpVal ** encup, StkId base )

static

Definition at line 610 of file lua-5.3.6/src/lvm.c.

                                                                 {
  LClosure *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->upvals[i]->v != v)
        return NULL;  /* wrong upvalue; cannot reuse closure */
    }
  }
  return c;  /* return cached closure (or NULL if no cached closure) */
}

References Proto::cache, Upvaldesc::idx, Upvaldesc::instack, NULL, Proto::sizeupvalues, LClosure::upvals, Proto::upvalues, and UpVal::v.

Referenced by luaV_execute().

l_strcmp()

static int l_strcmp ( const TString * ls, const TString * rs )

static

Definition at line 248 of file lua-5.3.6/src/lvm.c.

                                                           {
  const char *l = getstr(ls);
  size_t ll = tsslen(ls);
  const char *r = getstr(rs);
  size_t lr = tsslen(rs);
  for (;;) {  /* for each segment */
    int temp = strcoll(l, r);
    if (temp != 0)  /* not equal? */
      return temp;  /* done */
    else {  /* strings are equal up to a '\0' */
      size_t len = strlen(l);  /* index of first '\0' in both strings */
      if (len == lr)  /* 'rs' is finished? */
        return (len == ll) ? 0 : 1;  /* check 'ls' */
      else if (len == ll)  /* 'ls' is finished? */
        return -1;  /* 'ls' is smaller than 'rs' ('rs' is not finished) */
      /* both strings longer than 'len'; go on comparing after the '\0' */
      len++;
      l += len; ll -= len; r += len; lr -= len;
    }
  }
}

References getstr, and tsslen.

Referenced by luaV_lessequal(), and luaV_lessthan().

LEintfloat()

static int LEintfloat ( lua_Integer i, lua_Number f )

static

Definition at line 300 of file lua-5.3.6/src/lvm.c.

                                                    {
#if defined(l_intfitsf)
  if (!l_intfitsf(i)) {
    if (f >= -cast_num(LUA_MININTEGER))  /* -minint == maxint + 1 */
      return 1;  /* f >= maxint + 1 > i */
    else if (f >= cast_num(LUA_MININTEGER))  /* minint <= f <= maxint ? */
      return (i <= cast(lua_Integer, f));  /* compare them as integers */
    else  /* f < minint <= i (or 'f' is NaN)  -->  not(i <= f) */
      return 0;
  }
#endif
  return luai_numle(cast_num(i), f);  /* compare them as floats */
}

References cast, cast_num, l_intfitsf, and luai_numle.

Referenced by LEnum(), and LTnum().

LEnum()

static int LEnum ( const TValue * l, const TValue * r )

static

Definition at line 341 of file lua-5.3.6/src/lvm.c.

                                                    {
  if (ttisinteger(l)) {
    lua_Integer li = ivalue(l);
    if (ttisinteger(r))
      return li <= ivalue(r);  /* both are integers */
    else  /* 'l' is int and 'r' is float */
      return LEintfloat(li, fltvalue(r));  /* l <= r ? */
  }
  else {
    lua_Number lf = fltvalue(l);  /* 'l' must be float */
    if (ttisfloat(r))
      return luai_numle(lf, fltvalue(r));  /* both are float */
    else if (luai_numisnan(lf))  /* 'r' is int and 'l' is float */
      return 0;  /*  NaN <= i is always false */
    else  /* without NaN, (l <= r)  <-->  not(r < l) */
      return !LTintfloat(ivalue(r), lf);  /* not (r < l) ? */
  }
}

References fltvalue, ivalue, LEintfloat(), LTintfloat(), luai_numisnan, luai_numle, ttisfloat, and ttisinteger.

Referenced by luaV_lessequal().

LTintfloat()

static int LTintfloat ( lua_Integer i, lua_Number f )

static

Definition at line 281 of file lua-5.3.6/src/lvm.c.

                                                    {
#if defined(l_intfitsf)
  if (!l_intfitsf(i)) {
    if (f >= -cast_num(LUA_MININTEGER))  /* -minint == maxint + 1 */
      return 1;  /* f >= maxint + 1 > i */
    else if (f > cast_num(LUA_MININTEGER))  /* minint < f <= maxint ? */
      return (i < cast(lua_Integer, f));  /* compare them as integers */
    else  /* f <= minint <= i (or 'f' is NaN)  -->  not(i < f) */
      return 0;
  }
#endif
  return luai_numlt(cast_num(i), f);  /* compare them as floats */
}

References cast, cast_num, l_intfitsf, and luai_numlt.

Referenced by LEnum(), and LTnum().

LTnum()

static int LTnum ( const TValue * l, const TValue * r )

static

Definition at line 318 of file lua-5.3.6/src/lvm.c.

                                                    {
  if (ttisinteger(l)) {
    lua_Integer li = ivalue(l);
    if (ttisinteger(r))
      return li < ivalue(r);  /* both are integers */
    else  /* 'l' is int and 'r' is float */
      return LTintfloat(li, fltvalue(r));  /* l < r ? */
  }
  else {
    lua_Number lf = fltvalue(l);  /* 'l' must be float */
    if (ttisfloat(r))
      return luai_numlt(lf, fltvalue(r));  /* both are float */
    else if (luai_numisnan(lf))  /* 'r' is int and 'l' is float */
      return 0;  /* NaN < i is always false */
    else  /* without NaN, (l < r)  <-->  not(r <= l) */
      return !LEintfloat(ivalue(r), lf);  /* not (r <= l) ? */
  }
}

References fltvalue, ivalue, LEintfloat(), LTintfloat(), luai_numisnan, luai_numlt, ttisfloat, and ttisinteger.

Referenced by luaV_lessthan().

luaV_concat()

void luaV_concat	(	lua_State *	L,
		int	total )

Definition at line 474 of file lua-5.3.6/src/lvm.c.

                                           {
  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) || cvt2str(top-2)) || !tostring(L, top-1))
      luaT_trybinTM(L, top-2, top-1, top-2, TM_CONCAT);
    else if (isemptystr(top - 1))  /* second operand is empty? */
      cast_void(tostring(L, top - 2));  /* result is first operand */
    else if (isemptystr(top - 2)) {  /* first operand is an empty string? */
      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 = vslen(top - 1);
      TString *ts;
      /* collect total length and number of strings */
      for (n = 1; n < total && tostring(L, top - n - 1); n++) {
        size_t l = vslen(top - n - 1);
        if (l >= (MAX_SIZE/sizeof(char)) - tl)
          luaG_runerror(L, "string length overflow");
        tl += l;
      }
      if (tl <= LUAI_MAXSHORTLEN) {  /* is result a short string? */
        char buff[LUAI_MAXSHORTLEN];
        copy2buff(top, n, buff);  /* copy strings to buffer */
        ts = luaS_newlstr(L, buff, tl);
      }
      else {  /* long string; copy strings directly to final result */
        ts = luaS_createlngstrobj(L, tl);
        copy2buff(top, n, getstr(ts));
      }
      setsvalue2s(L, top - n, ts);  /* create result */
    }
    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 */
}

References cast_void, copy2buff(), cvt2str, getstr, isemptystr, lua_assert, luaG_runerror(), LUAI_MAXSHORTLEN, luaS_createlngstrobj(), luaS_newlstr(), luaT_trybinTM(), MAX_SIZE, setobjs2s, setsvalue2s, TM_CONCAT, lua_State::top, tostring, ttisstring, and vslen.

Referenced by luaV_execute(), and luaV_finishOp().

luaV_div()

lua_Integer luaV_div	(	lua_State *	L,
		lua_Integer	m,
		lua_Integer	n )

Definition at line 552 of file lua-5.3.6/src/lvm.c.

                                                                  {
  if (l_castS2U(n) + 1u <= 1u) {  /* special cases: -1 or 0 */
    if (n == 0)
      luaG_runerror(L, "attempt to divide by zero");
    return intop(-, 0, m);   /* n==-1; avoid overflow with 0x80000...//-1 */
  }
  else {
    lua_Integer q = m / n;  /* perform C division */
    if ((m ^ n) < 0 && m % n != 0)  /* 'm/n' would be negative non-integer? */
      q -= 1;  /* correct result for different rounding */
    return q;
  }
}

References intop, l_castS2U, and luaG_runerror().

Referenced by intarith(), and luaV_execute().

luaV_equalobj()

int luaV_equalobj	(	lua_State *	L,
		const TValue *	t1,
		const TValue *	t2 )

Definition at line 407 of file lua-5.3.6/src/lvm.c.

                                                                     {
  const TValue *tm;
  if (ttype(t1) != ttype(t2)) {  /* not the same variant? */
    if (ttnov(t1) != ttnov(t2) || ttnov(t1) != LUA_TNUMBER)
      return 0;  /* only numbers can be equal with different variants */
    else {  /* two numbers with different variants */
      lua_Integer i1, i2;  /* compare them as integers */
      return (tointeger(t1, &i1) && tointeger(t2, &i2) && i1 == i2);
    }
  }
  /* values have same type and same variant */
  switch (ttype(t1)) {
    case LUA_TNIL: return 1;
    case LUA_TNUMINT: return (ivalue(t1) == ivalue(t2));
    case LUA_TNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(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(tsvalue(t1), tsvalue(t2));
    case LUA_TLNGSTR: return luaS_eqlngstr(tsvalue(t1), tsvalue(t2));
    case LUA_TUSERDATA: {
      if (uvalue(t1) == uvalue(t2)) return 1;
      else if (L == NULL) return 0;
      tm = fasttm(L, uvalue(t1)->metatable, TM_EQ);
      if (tm == NULL)
        tm = fasttm(L, 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 = fasttm(L, hvalue(t1)->metatable, TM_EQ);
      if (tm == NULL)
        tm = fasttm(L, hvalue(t2)->metatable, TM_EQ);
      break;  /* will try TM */
    }
    default:
      return gcvalue(t1) == gcvalue(t2);
  }
  if (tm == NULL)  /* no TM? */
    return 0;  /* objects are different */
  luaT_callTM(L, tm, t1, t2, L->top, 1);  /* call TM */
  return !l_isfalse(L->top);
}

References bvalue, eqshrstr, fasttm, fltvalue, fvalue, gcvalue, hvalue, ivalue, l_isfalse, LUA_TBOOLEAN, LUA_TLCF, LUA_TLIGHTUSERDATA, LUA_TLNGSTR, LUA_TNIL, LUA_TNUMBER, LUA_TNUMFLT, LUA_TNUMINT, LUA_TSHRSTR, LUA_TTABLE, LUA_TUSERDATA, luai_numeq, luaS_eqlngstr(), luaT_callTM(), NULL, pvalue, TM_EQ, tointeger, lua_State::top, tsvalue, ttnov, ttype, and uvalue.

Referenced by lua_compare(), and luaV_execute().

luaV_execute()

void luaV_execute

(

lua_State *

L

)

Definition at line 786 of file lua-5.3.6/src/lvm.c.

                                 {
  CallInfo *ci = L->ci;
  LClosure *cl;
  TValue *k;
  StkId base;
  ci->callstatus |= CIST_FRESH;  /* fresh invocation of 'luaV_execute" */
 newframe:  /* reentry point when frame changes (call/return) */
  lua_assert(ci == L->ci);
  cl = clLvalue(ci->func);  /* local reference to function's closure */
  k = cl->p->k;  /* local reference to function's constant table */
  base = ci->u.l.base;  /* local copy of function's base */
  /* main loop of interpreter */
  for (;;) {
    Instruction i;
    StkId ra;
    vmfetch();
    vmdispatch (GET_OPCODE(i)) {
      vmcase(OP_MOVE) {
        setobjs2s(L, ra, RB(i));
        vmbreak;
      }
      vmcase(OP_LOADK) {
        TValue *rb = k + GETARG_Bx(i);
        setobj2s(L, ra, rb);
        vmbreak;
      }
      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);
        vmbreak;
      }
      vmcase(OP_LOADBOOL) {
        setbvalue(ra, GETARG_B(i));
        if (GETARG_C(i)) ci->u.l.savedpc++;  /* skip next instruction (if C) */
        vmbreak;
      }
      vmcase(OP_LOADNIL) {
        int b = GETARG_B(i);
        do {
          setnilvalue(ra++);
        } while (b--);
        vmbreak;
      }
      vmcase(OP_GETUPVAL) {
        int b = GETARG_B(i);
        setobj2s(L, ra, cl->upvals[b]->v);
        vmbreak;
      }
      vmcase(OP_GETTABUP) {
        TValue *upval = cl->upvals[GETARG_B(i)]->v;
        TValue *rc = RKC(i);
        gettableProtected(L, upval, rc, ra);
        vmbreak;
      }
      vmcase(OP_GETTABLE) {
        StkId rb = RB(i);
        TValue *rc = RKC(i);
        gettableProtected(L, rb, rc, ra);
        vmbreak;
      }
      vmcase(OP_SETTABUP) {
        TValue *upval = cl->upvals[GETARG_A(i)]->v;
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        settableProtected(L, upval, rb, rc);
        vmbreak;
      }
      vmcase(OP_SETUPVAL) {
        UpVal *uv = cl->upvals[GETARG_B(i)];
        setobj(L, uv->v, ra);
        luaC_upvalbarrier(L, uv);
        vmbreak;
      }
      vmcase(OP_SETTABLE) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        settableProtected(L, ra, rb, rc);
        vmbreak;
      }
      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);
        vmbreak;
      }
      vmcase(OP_SELF) {
        const TValue *aux;
        StkId rb = RB(i);
        TValue *rc = RKC(i);
        TString *key = tsvalue(rc);  /* key must be a string */
        setobjs2s(L, ra + 1, rb);
        if (luaV_fastget(L, rb, key, aux, luaH_getstr)) {
          setobj2s(L, ra, aux);
        }
        else Protect(luaV_finishget(L, rb, rc, ra, aux));
        vmbreak;
      }
      vmcase(OP_ADD) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (ttisinteger(rb) && ttisinteger(rc)) {
          lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
          setivalue(ra, intop(+, ib, ic));
        }
        else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          setfltvalue(ra, luai_numadd(L, nb, nc));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_ADD)); }
        vmbreak;
      }
      vmcase(OP_SUB) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (ttisinteger(rb) && ttisinteger(rc)) {
          lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
          setivalue(ra, intop(-, ib, ic));
        }
        else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          setfltvalue(ra, luai_numsub(L, nb, nc));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SUB)); }
        vmbreak;
      }
      vmcase(OP_MUL) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (ttisinteger(rb) && ttisinteger(rc)) {
          lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
          setivalue(ra, intop(*, ib, ic));
        }
        else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          setfltvalue(ra, luai_nummul(L, nb, nc));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MUL)); }
        vmbreak;
      }
      vmcase(OP_DIV) {  /* float division (always with floats) */
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          setfltvalue(ra, luai_numdiv(L, nb, nc));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_DIV)); }
        vmbreak;
      }
      vmcase(OP_BAND) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Integer ib; lua_Integer ic;
        if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
          setivalue(ra, intop(&, ib, ic));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BAND)); }
        vmbreak;
      }
      vmcase(OP_BOR) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Integer ib; lua_Integer ic;
        if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
          setivalue(ra, intop(|, ib, ic));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BOR)); }
        vmbreak;
      }
      vmcase(OP_BXOR) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Integer ib; lua_Integer ic;
        if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
          setivalue(ra, intop(^, ib, ic));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BXOR)); }
        vmbreak;
      }
      vmcase(OP_SHL) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Integer ib; lua_Integer ic;
        if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
          setivalue(ra, luaV_shiftl(ib, ic));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SHL)); }
        vmbreak;
      }
      vmcase(OP_SHR) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Integer ib; lua_Integer ic;
        if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
          setivalue(ra, luaV_shiftl(ib, -ic));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SHR)); }
        vmbreak;
      }
      vmcase(OP_MOD) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (ttisinteger(rb) && ttisinteger(rc)) {
          lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
          setivalue(ra, luaV_mod(L, ib, ic));
        }
        else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          lua_Number m;
          luai_nummod(L, nb, nc, m);
          setfltvalue(ra, m);
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MOD)); }
        vmbreak;
      }
      vmcase(OP_IDIV) {  /* floor division */
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (ttisinteger(rb) && ttisinteger(rc)) {
          lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
          setivalue(ra, luaV_div(L, ib, ic));
        }
        else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          setfltvalue(ra, luai_numidiv(L, nb, nc));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_IDIV)); }
        vmbreak;
      }
      vmcase(OP_POW) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        lua_Number nb; lua_Number nc;
        if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
          setfltvalue(ra, luai_numpow(L, nb, nc));
        }
        else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_POW)); }
        vmbreak;
      }
      vmcase(OP_UNM) {
        TValue *rb = RB(i);
        lua_Number nb;
        if (ttisinteger(rb)) {
          lua_Integer ib = ivalue(rb);
          setivalue(ra, intop(-, 0, ib));
        }
        else if (tonumber(rb, &nb)) {
          setfltvalue(ra, luai_numunm(L, nb));
        }
        else {
          Protect(luaT_trybinTM(L, rb, rb, ra, TM_UNM));
        }
        vmbreak;
      }
      vmcase(OP_BNOT) {
        TValue *rb = RB(i);
        lua_Integer ib;
        if (tointeger(rb, &ib)) {
          setivalue(ra, intop(^, ~l_castS2U(0), ib));
        }
        else {
          Protect(luaT_trybinTM(L, rb, rb, ra, TM_BNOT));
        }
        vmbreak;
      }
      vmcase(OP_NOT) {
        TValue *rb = RB(i);
        int res = l_isfalse(rb);  /* next assignment may change this value */
        setbvalue(ra, res);
        vmbreak;
      }
      vmcase(OP_LEN) {
        Protect(luaV_objlen(L, ra, RB(i)));
        vmbreak;
      }
      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 = base + b;
        setobjs2s(L, ra, rb);
        checkGC(L, (ra >= rb ? ra + 1 : rb));
        L->top = ci->top;  /* restore top */
        vmbreak;
      }
      vmcase(OP_JMP) {
        dojump(ci, i, 0);
        vmbreak;
      }
      vmcase(OP_EQ) {
        TValue *rb = RKB(i);
        TValue *rc = RKC(i);
        Protect(
          if (luaV_equalobj(L, rb, rc) != GETARG_A(i))
            ci->u.l.savedpc++;
          else
            donextjump(ci);
        )
        vmbreak;
      }
      vmcase(OP_LT) {
        Protect(
          if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i))
            ci->u.l.savedpc++;
          else
            donextjump(ci);
        )
        vmbreak;
      }
      vmcase(OP_LE) {
        Protect(
          if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i))
            ci->u.l.savedpc++;
          else
            donextjump(ci);
        )
        vmbreak;
      }
      vmcase(OP_TEST) {
        if (GETARG_C(i) ? l_isfalse(ra) : !l_isfalse(ra))
            ci->u.l.savedpc++;
          else
          donextjump(ci);
        vmbreak;
      }
      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);
        }
        vmbreak;
      }
      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 */
          Protect((void)0);  /* update 'base' */
        }
        else {  /* Lua function */
          ci = L->ci;
          goto newframe;  /* restart luaV_execute over new Lua function */
        }
        vmbreak;
      }
      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? */
          Protect((void)0);  /* update '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 */
        }
        vmbreak;
      }
      vmcase(OP_RETURN) {
        int b = GETARG_B(i);
        if (cl->p->sizep > 0) luaF_close(L, base);
        b = luaD_poscall(L, ci, ra, (b != 0 ? b - 1 : cast_int(L->top - ra)));
        if (ci->callstatus & CIST_FRESH)  /* local 'ci' still from callee */
          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) {
        if (ttisinteger(ra)) {  /* integer loop? */
          lua_Integer step = ivalue(ra + 2);
          lua_Integer idx = intop(+, ivalue(ra), step); /* increment index */
          lua_Integer limit = ivalue(ra + 1);
          if ((0 < step) ? (idx <= limit) : (limit <= idx)) {
            ci->u.l.savedpc += GETARG_sBx(i);  /* jump back */
            chgivalue(ra, idx);  /* update internal index... */
            setivalue(ra + 3, idx);  /* ...and external index */
          }
        }
        else {  /* floating loop */
          lua_Number step = fltvalue(ra + 2);
          lua_Number idx = luai_numadd(L, fltvalue(ra), step); /* inc. index */
          lua_Number limit = fltvalue(ra + 1);
          if (luai_numlt(0, step) ? luai_numle(idx, limit)
                                  : luai_numle(limit, idx)) {
            ci->u.l.savedpc += GETARG_sBx(i);  /* jump back */
            chgfltvalue(ra, idx);  /* update internal index... */
            setfltvalue(ra + 3, idx);  /* ...and external index */
          }
        }
        vmbreak;
      }
      vmcase(OP_FORPREP) {
        TValue *init = ra;
        TValue *plimit = ra + 1;
        TValue *pstep = ra + 2;
        lua_Integer ilimit;
        int stopnow;
        if (ttisinteger(init) && ttisinteger(pstep) &&
            forlimit(plimit, &ilimit, ivalue(pstep), &stopnow)) {
          /* all values are integer */
          lua_Integer initv = (stopnow ? 0 : ivalue(init));
          setivalue(plimit, ilimit);
          setivalue(init, intop(-, initv, ivalue(pstep)));
        }
        else {  /* try making all values floats */
          lua_Number ninit; lua_Number nlimit; lua_Number nstep;
          if (!tonumber(plimit, &nlimit))
            luaG_runerror(L, "'for' limit must be a number");
          setfltvalue(plimit, nlimit);
          if (!tonumber(pstep, &nstep))
            luaG_runerror(L, "'for' step must be a number");
          setfltvalue(pstep, nstep);
          if (!tonumber(init, &ninit))
            luaG_runerror(L, "'for' initial value must be a number");
          setfltvalue(init, luai_numsub(L, ninit, nstep));
        }
        ci->u.l.savedpc += GETARG_sBx(i);
        vmbreak;
      }
      vmcase(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 = 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 */
        }
        vmbreak;
      }
      vmcase(OP_SETLIST) {
        int n = GETARG_B(i);
        int c = GETARG_C(i);
        unsigned 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++);
        }
        h = hvalue(ra);
        last = ((c-1)*LFIELDS_PER_FLUSH) + n;
        if (last > h->sizearray)  /* needs more space? */
          luaH_resizearray(L, h, last);  /* preallocate it at once */
        for (; n > 0; n--) {
          TValue *val = ra+n;
          luaH_setint(L, h, last--, val);
          luaC_barrierback(L, h, val);
        }
        L->top = ci->top;  /* correct top (in case of previous open call) */
        vmbreak;
      }
      vmcase(OP_CLOSURE) {
        Proto *p = cl->p->p[GETARG_Bx(i)];
        LClosure *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);
        vmbreak;
      }
      vmcase(OP_VARARG) {
        int b = GETARG_B(i) - 1;  /* required results */
        int j;
        int n = cast_int(base - ci->func) - cl->p->numparams - 1;
        if (n < 0)  /* less arguments than parameters? */
          n = 0;  /* no vararg arguments */
        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 < n; j++)
          setobjs2s(L, ra + j, base - n + j);
        for (; j < b; j++)  /* complete required results with nil */
          setnilvalue(ra + j);
        vmbreak;
      }
      vmcase(OP_EXTRAARG) {
        lua_assert(0);
        vmbreak;
      }
    }
  }
}

References CallInfo::base, CallInfo::callstatus, cast_int, checkGC, chgfltvalue, chgivalue, lua_State::ci, CIST_FRESH, CIST_TAIL, clLvalue, dojump, donextjump, fltvalue, forlimit(), CallInfo::func, GET_OPCODE, GETARG_A, GETARG_Ax, GETARG_B, GETARG_Bx, GETARG_C, GETARG_sBx, getcached(), getproto, gettableProtected, hvalue, intop, isLua, ivalue, Proto::k, CallInfo::l, l_castS2U, l_isfalse, LFIELDS_PER_FLUSH, lua_assert, LUA_MULTRET, luaC_barrierback, luaC_upvalbarrier, luaD_call(), luaD_checkstack, luaD_poscall(), luaD_precall(), luaF_close(), luaG_runerror(), luaH_getstr(), luaH_new(), luaH_resize(), luaH_resizearray(), luaH_setint(), luai_numadd, luai_numdiv, luai_numidiv, luai_numle, luai_numlt, luai_nummod, luai_nummul, luai_numpow, luai_numsub, luai_numunm, luaO_fb2int(), luaT_trybinTM(), luaV_concat(), luaV_div(), luaV_equalobj(), luaV_fastget, luaV_finishget(), luaV_lessequal(), luaV_lessthan(), luaV_mod(), luaV_objlen(), luaV_shiftl(), NULL, Proto::numparams, OP_ADD, OP_BAND, OP_BNOT, OP_BOR, OP_BXOR, OP_CALL, OP_CLOSURE, OP_CONCAT, OP_DIV, OP_EQ, OP_EXTRAARG, OP_FORLOOP, OP_FORPREP, OP_GETTABLE, OP_GETTABUP, OP_GETUPVAL, OP_IDIV, OP_JMP, OP_LE, OP_LEN, OP_LOADBOOL, OP_LOADK, OP_LOADKX, OP_LOADNIL, OP_LT, OP_MOD, OP_MOVE, OP_MUL, OP_NEWTABLE, OP_NOT, OP_POW, OP_RETURN, OP_SELF, OP_SETLIST, OP_SETTABLE, OP_SETTABUP, OP_SETUPVAL, OP_SHL, OP_SHR, OP_SUB, OP_TAILCALL, OP_TEST, OP_TESTSET, OP_TFORCALL, OP_TFORLOOP, OP_UNM, OP_VARARG, Proto::p, LClosure::p, CallInfo::previous, Protect, pushclosure(), RA, RB, RKB, RKC, CallInfo::savedpc, setbvalue, setclLvalue, setfltvalue, sethvalue, setivalue, setnilvalue, setobj, setobj2s, setobjs2s, settableProtected, Table::sizearray, Proto::sizep, TM_ADD, TM_BAND, TM_BNOT, TM_BOR, TM_BXOR, TM_DIV, TM_IDIV, TM_MOD, TM_MUL, TM_POW, TM_SHL, TM_SHR, TM_SUB, TM_UNM, tointeger, tonumber, CallInfo::top, lua_State::top, tsvalue, ttisinteger, ttisnil, CallInfo::u, LClosure::upvals, UpVal::v, vmbreak, vmcase, vmdispatch, and vmfetch.

luaV_finishget()

void luaV_finishget	(	lua_State *	L,
		const TValue *	t,
		TValue *	key,
		StkId	val,
		const TValue *	slot )

Definition at line 160 of file lua-5.3.6/src/lvm.c.

                                          {
  int loop;  /* counter to avoid infinite loops */
  const TValue *tm;  /* metamethod */
  for (loop = 0; loop < MAXTAGLOOP; loop++) {
    if (slot == NULL) {  /* 't' is not a table? */
      lua_assert(!ttistable(t));
      tm = luaT_gettmbyobj(L, t, TM_INDEX);
      if (ttisnil(tm))
        luaG_typeerror(L, t, "index");  /* no metamethod */
      /* else will try the metamethod */
    }
    else {  /* 't' is a table */
      lua_assert(ttisnil(slot));
      tm = fasttm(L, hvalue(t)->metatable, TM_INDEX);  /* table's metamethod */
      if (tm == NULL) {  /* no metamethod? */
        setnilvalue(val);  /* result is nil */
        return;
      }
      /* else will try the metamethod */
    }
    if (ttisfunction(tm)) {  /* is metamethod a function? */
      luaT_callTM(L, tm, t, key, val, 1);  /* call it */
      return;
    }
    t = tm;  /* else try to access 'tm[key]' */
    if (luaV_fastget(L,t,key,slot,luaH_get)) {  /* fast track? */
      setobj2s(L, val, slot);  /* done */
      return;
    }
    /* else repeat (tail call 'luaV_finishget') */
  }
  luaG_runerror(L, "'__index' chain too long; possible loop");
}

References fasttm, hvalue, lua_assert, luaG_runerror(), luaG_typeerror(), luaH_get(), luaT_callTM(), luaT_gettmbyobj(), luaV_fastget, MAXTAGLOOP, NULL, setnilvalue, setobj2s, TM_INDEX, ttisfunction, ttisnil, and ttistable.

Referenced by auxgetstr(), auxgetstr(), lua_geti(), lua_gettable(), and luaV_execute().

luaV_finishOp()

void luaV_finishOp

(

lua_State *

L

)

Definition at line 656 of file lua-5.3.6/src/lvm.c.

                                  {
  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_IDIV:
    case OP_BAND: case OP_BOR: case OP_BXOR: case OP_SHL: case OP_SHR:
    case OP_MOD: case OP_POW:
    case OP_UNM: case OP_BNOT: 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--;
      if (ci->callstatus & CIST_LEQ) {  /* "<=" using "<" instead? */
        lua_assert(op == OP_LE);
        ci->callstatus ^= CIST_LEQ;  /* clear mark */
        res = !res;  /* negate 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 'luaT_trybinTM' 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);
  }
}

References CallInfo::base, CallInfo::callstatus, cast_int, lua_State::ci, CIST_LEQ, GET_OPCODE, GETARG_A, GETARG_B, GETARG_C, CallInfo::l, l_isfalse, lua_assert, luaV_concat(), OP_ADD, OP_BAND, OP_BNOT, OP_BOR, OP_BXOR, OP_CALL, OP_CONCAT, OP_DIV, OP_EQ, OP_GETTABLE, OP_GETTABUP, OP_IDIV, OP_JMP, OP_LE, OP_LEN, OP_LT, OP_MOD, OP_MUL, OP_POW, OP_SELF, OP_SETTABLE, OP_SETTABUP, OP_SHL, OP_SHR, OP_SUB, OP_TAILCALL, OP_TFORCALL, OP_TFORLOOP, OP_UNM, CallInfo::savedpc, setobj2s, setobjs2s, CallInfo::top, lua_State::top, and CallInfo::u.

luaV_finishset()

void luaV_finishset	(	lua_State *	L,
		const TValue *	t,
		TValue *	key,
		StkId	val,
		const TValue *	slot )

Definition at line 203 of file lua-5.3.6/src/lvm.c.

                                                    {
  int loop;  /* counter to avoid infinite loops */
  for (loop = 0; loop < MAXTAGLOOP; loop++) {
    const TValue *tm;  /* '__newindex' metamethod */
    if (slot != NULL) {  /* is 't' a table? */
      Table *h = hvalue(t);  /* save 't' table */
      lua_assert(ttisnil(slot));  /* old value must be nil */
      tm = fasttm(L, h->metatable, TM_NEWINDEX);  /* get metamethod */
      if (tm == NULL) {  /* no metamethod? */
        if (slot == luaO_nilobject)  /* no previous entry? */
          slot = luaH_newkey(L, h, key);  /* create one */
        /* no metamethod and (now) there is an entry with given key */
        setobj2t(L, cast(TValue *, slot), val);  /* set its new value */
        invalidateTMcache(h);
        luaC_barrierback(L, 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");
    }
    /* try the metamethod */
    if (ttisfunction(tm)) {
      luaT_callTM(L, tm, t, key, val, 0);
      return;
    }
    t = tm;  /* else repeat assignment over 'tm' */
    if (luaV_fastset(L, t, key, slot, luaH_get, val))
      return;  /* done */
    /* else loop */
  }
  luaG_runerror(L, "'__newindex' chain too long; possible loop");
}

References cast, fasttm, hvalue, invalidateTMcache, lua_assert, luaC_barrierback, luaG_runerror(), luaG_typeerror(), luaH_get(), luaH_newkey(), luaO_nilobject, luaT_callTM(), luaT_gettmbyobj(), luaV_fastset, MAXTAGLOOP, Table::metatable, NULL, setobj2t, TM_NEWINDEX, ttisfunction, and ttisnil.

Referenced by auxsetstr(), auxsetstr(), lua_seti(), and lua_settable().

luaV_lessequal()

int luaV_lessequal	(	lua_State *	L,
		const TValue *	l,
		const TValue *	r )

Definition at line 384 of file lua-5.3.6/src/lvm.c.

                                                                    {
  int res;
  if (ttisnumber(l) && ttisnumber(r))  /* both operands are numbers? */
    return LEnum(l, r);
  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 */
  }
}

References CallInfo::callstatus, lua_State::ci, CIST_LEQ, l_strcmp(), LEnum(), luaG_ordererror(), luaT_callorderTM(), TM_LE, TM_LT, tsvalue, ttisnumber, and ttisstring.

Referenced by luaV_execute().

luaV_lessthan()

int luaV_lessthan	(	lua_State *	L,
		const TValue *	l,
		const TValue *	r )

Definition at line 364 of file lua-5.3.6/src/lvm.c.

                                                                   {
  int res;
  if (ttisnumber(l) && ttisnumber(r))  /* both operands are numbers? */
    return LTnum(l, r);
  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_LT)) < 0)  /* no metamethod? */
    luaG_ordererror(L, l, r);  /* error */
  return res;
}

References l_strcmp(), LTnum(), luaG_ordererror(), luaT_callorderTM(), TM_LT, tsvalue, ttisnumber, and ttisstring.

Referenced by luaV_execute().

luaV_mod()

lua_Integer luaV_mod	(	lua_State *	L,
		lua_Integer	m,
		lua_Integer	n )

Definition at line 572 of file lua-5.3.6/src/lvm.c.

                                                                  {
  if (l_castS2U(n) + 1u <= 1u) {  /* special cases: -1 or 0 */
    if (n == 0)
      luaG_runerror(L, "attempt to perform 'n%%0'");
    return 0;   /* m % -1 == 0; avoid overflow with 0x80000...%-1 */
  }
  else {
    lua_Integer r = m % n;
    if (r != 0 && (m ^ n) < 0)  /* 'm/n' would be non-integer negative? */
      r += n;  /* correct result for different rounding */
    return r;
  }
}

References l_castS2U, and luaG_runerror().

Referenced by intarith(), intarith(), and luaV_execute().

luaV_objlen()

void luaV_objlen	(	lua_State *	L,
		StkId	ra,
		const TValue *	rb )

Definition at line 517 of file lua-5.3.6/src/lvm.c.

                                                            {
  const TValue *tm;
  switch (ttype(rb)) {
    case LUA_TTABLE: {
      Table *h = hvalue(rb);
      tm = fasttm(L, h->metatable, TM_LEN);
      if (tm) break;  /* metamethod? break switch to call it */
      setivalue(ra, luaH_getn(h));  /* else primitive len */
      return;
    }
    case LUA_TSHRSTR: {
      setivalue(ra, tsvalue(rb)->shrlen);
      return;
    }
    case LUA_TLNGSTR: {
      setivalue(ra, tsvalue(rb)->u.lnglen);
      return;
    }
    default: {  /* try metamethod */
      tm = luaT_gettmbyobj(L, rb, TM_LEN);
      if (ttisnil(tm))  /* no metamethod? */
        luaG_typeerror(L, rb, "get length of");
      break;
    }
  }
  luaT_callTM(L, tm, rb, rb, ra, 1);
}

References fasttm, hvalue, LUA_TLNGSTR, LUA_TSHRSTR, LUA_TTABLE, luaG_typeerror(), luaH_getn(), luaT_callTM(), luaT_gettmbyobj(), Table::metatable, setivalue, TM_LEN, tsvalue, ttisnil, and ttype.

Referenced by luaV_execute().

luaV_shiftl()

lua_Integer luaV_shiftl	(	lua_Integer	x,
		lua_Integer	y )

Definition at line 593 of file lua-5.3.6/src/lvm.c.

                                                       {
  if (y < 0) {  /* shift right? */
    if (y <= -NBITS) return 0;
    else return intop(>>, x, -y);
  }
  else {  /* shift left */
    if (y >= NBITS) return 0;
    else return intop(<<, x, y);
  }
}

References intop, and NBITS.

Referenced by intarith(), intarith(), and luaV_execute().

luaV_tointeger()

int luaV_tointeger	(	const TValue *	obj,
		lua_Integer *	p,
		int	mode )

Definition at line 94 of file lua-5.3.6/src/lvm.c.

                                                                 {
  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 */
}

References cvt2num, fltvalue, ivalue, l_floor, lua_numbertointeger, luaO_str2num(), svalue, ttisfloat, ttisinteger, and vslen.

Referenced by forlimit(), luaH_get(), and luaH_newkey().

luaV_tonumber_()

int luaV_tonumber_	(	const TValue *	obj,
		lua_Number *	n )

Definition at line 72 of file lua-5.3.6/src/lvm.c.

                                                      {
  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 */
}

References cast_num, cvt2num, ivalue, luaO_str2num(), nvalue, svalue, ttisinteger, and vslen.

pushclosure()

static void pushclosure ( lua_State * L, Proto * p, UpVal ** encup, StkId base, StkId ra )

static

Definition at line 632 of file lua-5.3.6/src/lvm.c.

                                   {
  int nup = p->sizeupvalues;
  Upvaldesc *uv = p->upvalues;
  int i;
  LClosure *ncl = luaF_newLclosure(L, nup);
  ncl->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->upvals[i] = luaF_findupval(L, base + uv[i].idx);
    else  /* get upvalue from enclosing function */
      ncl->upvals[i] = encup[uv[i].idx];
    ncl->upvals[i]->refcount++;
    /* new closure is white, so we do not need a barrier here */
  }
  if (!isblack(p))  /* cache will not break GC invariant? */
    p->cache = ncl;  /* save it on cache for reuse */
}

References Proto::cache, Upvaldesc::idx, isblack, luaF_findupval(), luaF_newLclosure(), LClosure::p, UpVal::refcount, setclLvalue, Proto::sizeupvalues, LClosure::upvals, and Proto::upvalues.

Referenced by luaV_execute().