/script_binding/lua/lua/lparser.h

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