typedef enum {
VVOID, /* no value */
VNIL,
VTRUE,
VFALSE,
VK, /* info = index of constant in `k' */
VKNUM, /* nval = numerical value */
VLOCAL, /* info = local register */
VUPVAL, /* info = index of upvalue in `upvalues' */
VGLOBAL, /* info = index of table; aux = index of global name in `k' */
VINDEXED, /* info = table register; aux = index register (or `k') */
VJMP, /* info = instruction pc */
VRELOCABLE, /* info = instruction pc */
VNONRELOC, /* info = result register */
VCALL, /* info = instruction pc */
VVARARG /* info = instruction pc */
} expkind;
typedef struct expdesc {
expkind k;
union {
struct { int info, aux; } s;
lua_Number nval;
} u;
int t; /* patch list of `exit when true' */
int f; /* patch list of `exit when false' */
} expdesc;
/* state needed to generate code for a given function */
typedef struct FuncState {
Proto *f; /* current function header */
Table *h; /* table to find (and reuse) elements in `k' */
struct FuncState *prev; /* enclosing function */
struct LexState *ls; /* lexical state */
struct lua_State *L; /* copy of the Lua state */
struct BlockCnt *bl; /* chain of current blocks */
int pc; /* next position to code (equivalent to `ncode') */
int lasttarget; /* `pc' of last `jump target' */
int jpc; /* list of pending jumps to `pc' */
int freereg; /* first free register */
int nk; /* number of elements in `k' */
int np; /* number of elements in `p' */
short nlocvars; /* number of elements in `locvars' */
lu_byte nactvar; /* number of active local variables */
upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */
unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */
} FuncState;
