Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4680 | right-hear | 1 | /* |
| 2 | ** $Id: lparser.h,v 1.65 2010/07/07 16:27:29 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 | typedef struct vardesc { |
||
| 57 | unsigned short idx; |
||
| 58 | } vardesc; |
||
| 59 | |||
| 60 | |||
| 61 | /* list of all active local variables */ |
||
| 62 | typedef struct Varlist { |
||
| 63 | vardesc *actvar; |
||
| 64 | int nactvar; |
||
| 65 | int actvarsize; |
||
| 66 | } Varlist; |
||
| 67 | |||
| 68 | |||
| 69 | struct BlockCnt; /* defined in lparser.c */ |
||
| 70 | |||
| 71 | |||
| 72 | /* state needed to generate code for a given function */ |
||
| 73 | typedef struct FuncState { |
||
| 74 | Proto *f; /* current function header */ |
||
| 75 | Table *h; /* table to find (and reuse) elements in `k' */ |
||
| 76 | struct FuncState *prev; /* enclosing function */ |
||
| 77 | struct LexState *ls; /* lexical state */ |
||
| 78 | struct lua_State *L; /* copy of the Lua state */ |
||
| 79 | struct BlockCnt *bl; /* chain of current blocks */ |
||
| 80 | int pc; /* next position to code (equivalent to `ncode') */ |
||
| 81 | int lasttarget; /* `pc' of last `jump target' */ |
||
| 82 | int jpc; /* list of pending jumps to `pc' */ |
||
| 83 | int freereg; /* first free register */ |
||
| 84 | int nk; /* number of elements in `k' */ |
||
| 85 | int np; /* number of elements in `p' */ |
||
| 86 | int firstlocal; /* index of first local var of this function */ |
||
| 87 | short nlocvars; /* number of elements in `locvars' */ |
||
| 88 | lu_byte nactvar; /* number of active local variables */ |
||
| 89 | lu_byte nups; /* number of upvalues */ |
||
| 90 | } FuncState; |
||
| 91 | |||
| 92 | |||
| 93 | LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, |
||
| 94 | Varlist *varl, const char *name); |
||
| 95 | |||
| 96 | |||
| 97 | #endif |