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1 | /* BEGIN CSTYLED */ |
2 | /* | |
3 | ** $Id: lparser.h,v 1.70.1.1 2013/04/12 18:48:47 roberto Exp $ | |
4 | ** Lua Parser | |
5 | ** See Copyright Notice in lua.h | |
6 | */ | |
7 | ||
8 | #ifndef lparser_h | |
9 | #define lparser_h | |
10 | ||
11 | #include "llimits.h" | |
12 | #include "lobject.h" | |
13 | #include "lzio.h" | |
14 | ||
15 | ||
16 | /* | |
17 | ** Expression descriptor | |
18 | */ | |
19 | ||
20 | typedef enum { | |
21 | VVOID, /* no value */ | |
22 | VNIL, | |
23 | VTRUE, | |
24 | VFALSE, | |
25 | VK, /* info = index of constant in `k' */ | |
26 | VKNUM, /* nval = numerical value */ | |
27 | VNONRELOC, /* info = result register */ | |
28 | VLOCAL, /* info = local register */ | |
29 | VUPVAL, /* info = index of upvalue in 'upvalues' */ | |
30 | VINDEXED, /* t = table register/upvalue; idx = index R/K */ | |
31 | VJMP, /* info = instruction pc */ | |
32 | VRELOCABLE, /* info = instruction pc */ | |
33 | VCALL, /* info = instruction pc */ | |
34 | VVARARG /* info = instruction pc */ | |
35 | } expkind; | |
36 | ||
37 | ||
38 | #define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED) | |
39 | #define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL) | |
40 | ||
41 | typedef struct expdesc { | |
42 | expkind k; | |
43 | union { | |
44 | struct { /* for indexed variables (VINDEXED) */ | |
45 | short idx; /* index (R/K) */ | |
46 | lu_byte t; /* table (register or upvalue) */ | |
47 | lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ | |
48 | } ind; | |
49 | int info; /* for generic use */ | |
50 | lua_Number nval; /* for VKNUM */ | |
51 | } u; | |
52 | int t; /* patch list of `exit when true' */ | |
53 | int f; /* patch list of `exit when false' */ | |
54 | } expdesc; | |
55 | ||
56 | ||
57 | /* description of active local variable */ | |
58 | typedef struct Vardesc { | |
59 | short idx; /* variable index in stack */ | |
60 | } Vardesc; | |
61 | ||
62 | ||
63 | /* description of pending goto statements and label statements */ | |
64 | typedef struct Labeldesc { | |
65 | TString *name; /* label identifier */ | |
66 | int pc; /* position in code */ | |
67 | int line; /* line where it appeared */ | |
68 | lu_byte nactvar; /* local level where it appears in current block */ | |
69 | } Labeldesc; | |
70 | ||
71 | ||
72 | /* list of labels or gotos */ | |
73 | typedef struct Labellist { | |
74 | Labeldesc *arr; /* array */ | |
75 | int n; /* number of entries in use */ | |
76 | int size; /* array size */ | |
77 | } Labellist; | |
78 | ||
79 | ||
80 | /* dynamic structures used by the parser */ | |
81 | typedef struct Dyndata { | |
82 | struct { /* list of active local variables */ | |
83 | Vardesc *arr; | |
84 | int n; | |
85 | int size; | |
86 | } actvar; | |
87 | Labellist gt; /* list of pending gotos */ | |
88 | Labellist label; /* list of active labels */ | |
89 | } Dyndata; | |
90 | ||
91 | ||
92 | /* control of blocks */ | |
93 | struct BlockCnt; /* defined in lparser.c */ | |
94 | ||
95 | ||
96 | /* state needed to generate code for a given function */ | |
97 | typedef struct FuncState { | |
98 | Proto *f; /* current function header */ | |
99 | Table *h; /* table to find (and reuse) elements in `k' */ | |
100 | struct FuncState *prev; /* enclosing function */ | |
101 | struct LexState *ls; /* lexical state */ | |
102 | struct BlockCnt *bl; /* chain of current blocks */ | |
103 | int pc; /* next position to code (equivalent to `ncode') */ | |
104 | int lasttarget; /* 'label' of last 'jump label' */ | |
105 | int jpc; /* list of pending jumps to `pc' */ | |
106 | int nk; /* number of elements in `k' */ | |
107 | int np; /* number of elements in `p' */ | |
108 | int firstlocal; /* index of first local var (in Dyndata array) */ | |
109 | short nlocvars; /* number of elements in 'f->locvars' */ | |
110 | lu_byte nactvar; /* number of active local variables */ | |
111 | lu_byte nups; /* number of upvalues */ | |
112 | lu_byte freereg; /* first free register */ | |
113 | } FuncState; | |
114 | ||
115 | ||
116 | LUAI_FUNC Closure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, | |
117 | Dyndata *dyd, const char *name, int firstchar); | |
118 | ||
119 | ||
120 | #endif | |
121 | /* END CSTYLED */ |