OLD | NEW |
(Empty) | |
| 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 |
OLD | NEW |