1/*	$NetBSD$	*/
2
3/*
4** Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp
5** Lua Parser
6** See Copyright Notice in lua.h
7*/
8
9#ifndef lparser_h
10#define lparser_h
11
12#include "llimits.h"
13#include "lobject.h"
14#include "lzio.h"
15
16
17/*
18** Expression descriptor
19*/
20
21typedef enum {
22  VVOID,	/* no value */
23  VNIL,
24  VTRUE,
25  VFALSE,
26  VK,		/* info = index of constant in `k' */
27  VKNUM,	/* nval = numerical value */
28  VLOCAL,	/* info = local register */
29  VUPVAL,       /* info = index of upvalue in `upvalues' */
30  VGLOBAL,	/* info = index of table; aux = index of global name in `k' */
31  VINDEXED,	/* info = table register; aux = index register (or `k') */
32  VJMP,		/* info = instruction pc */
33  VRELOCABLE,	/* info = instruction pc */
34  VNONRELOC,	/* info = result register */
35  VCALL,	/* info = instruction pc */
36  VVARARG	/* info = instruction pc */
37} expkind;
38
39typedef struct expdesc {
40  expkind k;
41  union {
42    struct { int info, aux; } s;
43    lua_Number nval;
44  } u;
45  int t;  /* patch list of `exit when true' */
46  int f;  /* patch list of `exit when false' */
47} expdesc;
48
49
50typedef struct upvaldesc {
51  lu_byte k;
52  lu_byte info;
53} upvaldesc;
54
55
56struct BlockCnt;  /* defined in lparser.c */
57
58
59/* state needed to generate code for a given function */
60typedef struct FuncState {
61  Proto *f;  /* current function header */
62  Table *h;  /* table to find (and reuse) elements in `k' */
63  struct FuncState *prev;  /* enclosing function */
64  struct LexState *ls;  /* lexical state */
65  struct lua_State *L;  /* copy of the Lua state */
66  struct BlockCnt *bl;  /* chain of current blocks */
67  int pc;  /* next position to code (equivalent to `ncode') */
68  int lasttarget;   /* `pc' of last `jump target' */
69  int jpc;  /* list of pending jumps to `pc' */
70  int freereg;  /* first free register */
71  int nk;  /* number of elements in `k' */
72  int np;  /* number of elements in `p' */
73  short nlocvars;  /* number of elements in `locvars' */
74  lu_byte nactvar;  /* number of active local variables */
75  upvaldesc upvalues[LUAI_MAXUPVALUES];  /* upvalues */
76  unsigned short actvar[LUAI_MAXVARS];  /* declared-variable stack */
77} FuncState;
78
79
80LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
81                                            const char *name);
82
83
84#endif
85