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Root/lua/lparser.h

1/*
2** $Id: lparser.h,v 1.57 2006/03/09 18:14:31 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

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