Re: Threaded vm core loop (Was: Re: how does lua arrange vmcase?)

[Roberto Ierusalimschy <roberto@...>]

> As far as I understand it, this should have been a relatively easy
> change to make and maintain; lvm.c has #defines ready for you to make
> such a modification (vmdispatch, vmcase, vmbreak).
> https://www.lua.org/source/5.3/lvm.c.html#vmdispatch

Last time I tested, the following definitions would do the trick.

-- Roberto

/*---------------------------------------------------------------------*/
#undef vmdispatch
#undef vmcase
#undef vmbreak

#define vmdispatch(x)     goto *disptab[x];

#define vmcase(l)     L_##l:

#define vmbreak		vmfetch(); vmdispatch(GET_OPCODE(i));


static void *disptab[] = {
  &&L_OP_MOVE,
  &&L_OP_LOADK,
  &&L_OP_LOADKX,
  &&L_OP_LOADBOOL,
  &&L_OP_LOADNIL,
  &&L_OP_GETUPVAL,
  &&L_OP_GETTABUP,
  &&L_OP_GETTABLE,
  &&L_OP_SETTABUP,
  &&L_OP_SETUPVAL,
  &&L_OP_SETTABLE,
  &&L_OP_NEWTABLE,
  &&L_OP_SELF,
  &&L_OP_ADD,
  &&L_OP_SUB,
  &&L_OP_MUL,
  &&L_OP_MOD,
  &&L_OP_POW,
  &&L_OP_DIV,
  &&L_OP_IDIV,
  &&L_OP_BAND,
  &&L_OP_BOR,
  &&L_OP_BXOR,
  &&L_OP_SHL,
  &&L_OP_SHR,
  &&L_OP_UNM,
  &&L_OP_BNOT,
  &&L_OP_NOT,
  &&L_OP_LEN,
  &&L_OP_CONCAT,
  &&L_OP_JMP,
  &&L_OP_EQ,
  &&L_OP_LT,
  &&L_OP_LE,
  &&L_OP_TEST,
  &&L_OP_TESTSET,
  &&L_OP_CALL,
  &&L_OP_TAILCALL,
  &&L_OP_RETURN,
  &&L_OP_FORLOOP,
  &&L_OP_FORPREP,
  &&L_OP_TFORCALL,
  &&L_OP_TFORLOOP,
  &&L_OP_SETLIST,
  &&L_OP_CLOSURE,
  &&L_OP_VARARG,
  &&L_OP_EXTRAARG,
};