2 ** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp $
4 ** See Copyright Notice in lua.h
16 ** Expression descriptor
24 VK, /* info = index of constant in `k' */
25 VKNUM, /* nval = numerical value */
26 VLOCAL, /* info = local register */
27 VUPVAL, /* info = index of upvalue in `upvalues' */
28 VGLOBAL, /* info = index of table; aux = index of global name in `k' */
29 VINDEXED, /* info = table register; aux = index register (or `k') */
30 VJMP, /* info = instruction pc */
31 VRELOCABLE, /* info = instruction pc */
32 VNONRELOC, /* info = result register */
33 VCALL, /* info = instruction pc */
34 VVARARG, /* info = instruction pc */
35 VKINT /* ival = integer value */
37 ,VKNUM2 /* nval = imaginary value */
41 typedef struct expdesc {
44 struct { int info, aux; } s;
48 int t; /* patch list of `exit when true' */
49 int f; /* patch list of `exit when false' */
53 typedef struct upvaldesc {
59 struct BlockCnt; /* defined in lparser.c */
62 /* state needed to generate code for a given function */
63 typedef struct FuncState {
64 Proto *f; /* current function header */
65 Table *h; /* table to find (and reuse) elements in `k' */
66 struct FuncState *prev; /* enclosing function */
67 struct LexState *ls; /* lexical state */
68 struct lua_State *L; /* copy of the Lua state */
69 struct BlockCnt *bl; /* chain of current blocks */
70 int pc; /* next position to code (equivalent to `ncode') */
71 int lasttarget; /* `pc' of last `jump target' */
72 int jpc; /* list of pending jumps to `pc' */
73 int freereg; /* first free register */
74 int nk; /* number of elements in `k' */
75 int np; /* number of elements in `p' */
76 short nlocvars; /* number of elements in `locvars' */
77 lu_byte nactvar; /* number of active local variables */
78 upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */
79 unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */
83 LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,