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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5205 | clevermous | 1 | /* |
| 2 | ** $Id: lparser.h,v 1.69 2011/07/27 18:09:01 roberto Exp $ |
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| 3 | ** Lua Parser |
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| 4 | ** See Copyright Notice in lua.h |
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| 5 | */ |
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| 6 | |||
| 7 | #ifndef lparser_h |
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| 8 | #define lparser_h |
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| 9 | |||
| 10 | #include "llimits.h" |
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| 11 | #include "lobject.h" |
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| 12 | #include "lzio.h" |
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| 13 | |||
| 14 | |||
| 15 | /* |
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| 16 | ** Expression descriptor |
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| 17 | */ |
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| 18 | |||
| 19 | typedef enum { |
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| 20 | VVOID, /* no value */ |
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| 21 | VNIL, |
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| 22 | VTRUE, |
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| 23 | VFALSE, |
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| 24 | VK, /* info = index of constant in `k' */ |
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| 25 | VKNUM, /* nval = numerical value */ |
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| 26 | VNONRELOC, /* info = result register */ |
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| 27 | VLOCAL, /* info = local register */ |
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| 28 | VUPVAL, /* info = index of upvalue in 'upvalues' */ |
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| 29 | VINDEXED, /* t = table register/upvalue; idx = index R/K */ |
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| 30 | VJMP, /* info = instruction pc */ |
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| 31 | VRELOCABLE, /* info = instruction pc */ |
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| 32 | VCALL, /* info = instruction pc */ |
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| 33 | VVARARG /* info = instruction pc */ |
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| 34 | } expkind; |
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| 35 | |||
| 36 | |||
| 37 | #define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED) |
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| 38 | #define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL) |
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| 39 | |||
| 40 | typedef struct expdesc { |
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| 41 | expkind k; |
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| 42 | union { |
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| 43 | struct { /* for indexed variables (VINDEXED) */ |
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| 44 | short idx; /* index (R/K) */ |
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| 45 | lu_byte t; /* table (register or upvalue) */ |
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| 46 | lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ |
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| 47 | } ind; |
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| 48 | int info; /* for generic use */ |
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| 49 | lua_Number nval; /* for VKNUM */ |
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| 50 | } u; |
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| 51 | int t; /* patch list of `exit when true' */ |
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| 52 | int f; /* patch list of `exit when false' */ |
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| 53 | } expdesc; |
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| 54 | |||
| 55 | |||
| 56 | /* description of active local variable */ |
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| 57 | typedef struct Vardesc { |
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| 58 | short idx; /* variable index in stack */ |
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| 59 | } Vardesc; |
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| 60 | |||
| 61 | |||
| 62 | /* description of pending goto statements and label statements */ |
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| 63 | typedef struct Labeldesc { |
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| 64 | TString *name; /* label identifier */ |
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| 65 | int pc; /* position in code */ |
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| 66 | int line; /* line where it appeared */ |
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| 67 | lu_byte nactvar; /* local level where it appears in current block */ |
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| 68 | } Labeldesc; |
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| 69 | |||
| 70 | |||
| 71 | /* list of labels or gotos */ |
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| 72 | typedef struct Labellist { |
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| 73 | Labeldesc *arr; /* array */ |
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| 74 | int n; /* number of entries in use */ |
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| 75 | int size; /* array size */ |
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| 76 | } Labellist; |
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| 77 | |||
| 78 | |||
| 79 | /* dynamic structures used by the parser */ |
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| 80 | typedef struct Dyndata { |
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| 81 | struct { /* list of active local variables */ |
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| 82 | Vardesc *arr; |
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| 83 | int n; |
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| 84 | int size; |
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| 85 | } actvar; |
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| 86 | Labellist gt; /* list of pending gotos */ |
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| 87 | Labellist label; /* list of active labels */ |
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| 88 | } Dyndata; |
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| 89 | |||
| 90 | |||
| 91 | /* control of blocks */ |
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| 92 | struct BlockCnt; /* defined in lparser.c */ |
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| 93 | |||
| 94 | |||
| 95 | /* state needed to generate code for a given function */ |
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| 96 | typedef struct FuncState { |
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| 97 | Proto *f; /* current function header */ |
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| 98 | Table *h; /* table to find (and reuse) elements in `k' */ |
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| 99 | struct FuncState *prev; /* enclosing function */ |
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| 100 | struct LexState *ls; /* lexical state */ |
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| 101 | struct BlockCnt *bl; /* chain of current blocks */ |
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| 102 | int pc; /* next position to code (equivalent to `ncode') */ |
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| 103 | int lasttarget; /* 'label' of last 'jump label' */ |
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| 104 | int jpc; /* list of pending jumps to `pc' */ |
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| 105 | int nk; /* number of elements in `k' */ |
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| 106 | int np; /* number of elements in `p' */ |
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| 107 | int firstlocal; /* index of first local var (in Dyndata array) */ |
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| 108 | short nlocvars; /* number of elements in 'f->locvars' */ |
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| 109 | lu_byte nactvar; /* number of active local variables */ |
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| 110 | lu_byte nups; /* number of upvalues */ |
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| 111 | lu_byte freereg; /* first free register */ |
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| 112 | } FuncState; |
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| 113 | |||
| 114 | |||
| 115 | LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, |
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| 116 | Dyndata *dyd, const char *name, int firstchar); |
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| 117 | |||
| 118 | |||
| 119 | #endif |