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ba8b5c17 | 1 | /* |
2 | ** $Id: lparser.h,v 1.70 2012/05/08 13:53:33 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 | ||
19 | typedef 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 | VNONRELOC, /* info = result register */ | |
27 | VLOCAL, /* info = local register */ | |
28 | VUPVAL, /* info = index of upvalue in 'upvalues' */ | |
29 | VINDEXED, /* t = table register/upvalue; idx = index R/K */ | |
30 | VJMP, /* info = instruction pc */ | |
31 | VRELOCABLE, /* info = instruction pc */ | |
32 | VCALL, /* info = instruction pc */ | |
33 | VVARARG /* info = instruction pc */ | |
34 | } expkind; | |
35 | ||
36 | ||
37 | #define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED) | |
38 | #define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL) | |
39 | ||
40 | typedef struct expdesc { | |
41 | expkind k; | |
42 | union { | |
43 | struct { /* for indexed variables (VINDEXED) */ | |
44 | short idx; /* index (R/K) */ | |
45 | lu_byte t; /* table (register or upvalue) */ | |
46 | lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ | |
47 | } ind; | |
48 | int info; /* for generic use */ | |
49 | lua_Number nval; /* for VKNUM */ | |
50 | } u; | |
51 | int t; /* patch list of `exit when true' */ | |
52 | int f; /* patch list of `exit when false' */ | |
53 | } expdesc; | |
54 | ||
55 | ||
56 | /* description of active local variable */ | |
57 | typedef struct Vardesc { | |
58 | short idx; /* variable index in stack */ | |
59 | } Vardesc; | |
60 | ||
61 | ||
62 | /* description of pending goto statements and label statements */ | |
63 | typedef struct Labeldesc { | |
64 | TString *name; /* label identifier */ | |
65 | int pc; /* position in code */ | |
66 | int line; /* line where it appeared */ | |
67 | lu_byte nactvar; /* local level where it appears in current block */ | |
68 | } Labeldesc; | |
69 | ||
70 | ||
71 | /* list of labels or gotos */ | |
72 | typedef struct Labellist { | |
73 | Labeldesc *arr; /* array */ | |
74 | int n; /* number of entries in use */ | |
75 | int size; /* array size */ | |
76 | } Labellist; | |
77 | ||
78 | ||
79 | /* dynamic structures used by the parser */ | |
80 | typedef struct Dyndata { | |
81 | struct { /* list of active local variables */ | |
82 | Vardesc *arr; | |
83 | int n; | |
84 | int size; | |
85 | } actvar; | |
86 | Labellist gt; /* list of pending gotos */ | |
87 | Labellist label; /* list of active labels */ | |
88 | } Dyndata; | |
89 | ||
90 | ||
91 | /* control of blocks */ | |
92 | struct BlockCnt; /* defined in lparser.c */ | |
93 | ||
94 | ||
95 | /* state needed to generate code for a given function */ | |
96 | typedef struct FuncState { | |
97 | Proto *f; /* current function header */ | |
98 | Table *h; /* table to find (and reuse) elements in `k' */ | |
99 | struct FuncState *prev; /* enclosing function */ | |
100 | struct LexState *ls; /* lexical state */ | |
101 | struct BlockCnt *bl; /* chain of current blocks */ | |
102 | int pc; /* next position to code (equivalent to `ncode') */ | |
103 | int lasttarget; /* 'label' of last 'jump label' */ | |
104 | int jpc; /* list of pending jumps to `pc' */ | |
105 | int nk; /* number of elements in `k' */ | |
106 | int np; /* number of elements in `p' */ | |
107 | int firstlocal; /* index of first local var (in Dyndata array) */ | |
108 | short nlocvars; /* number of elements in 'f->locvars' */ | |
109 | lu_byte nactvar; /* number of active local variables */ | |
110 | lu_byte nups; /* number of upvalues */ | |
111 | lu_byte freereg; /* first free register */ | |
112 | } FuncState; | |
113 | ||
114 | ||
115 | LUAI_FUNC Closure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, | |
116 | Dyndata *dyd, const char *name, int firstchar); | |
117 | ||
118 | ||
119 | #endif |