About FuncState
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- Subject: About FuncState
- From: "CHU Run-min" <churunmin@...>
- Date: Wed, 7 Jun 2006 00:49:16 +0800
/* 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;
I know the struct FuncState is important for parsing. But I don't
understand clearly the expression parsing and assignment parsing. I'm
stumbled especially by the member 'freereg' and 'nactvar' of
FuncState.
Would you explain the detailed information of 'freereg' and 'nactvar'?