| commit | author | age | ||
| 6e1425 | 1 | /* |
| H | 2 | ** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 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 | VLOCAL, /* info = local register */ | |
| 27 | VUPVAL, /* info = index of upvalue in `upvalues' */ | |
| 28 | VGLOBAL, /* info = index of table; aux = index of global name in `k' */ | |
| 29 | VINDEXED, /* info = table register; aux = index register (or `k') */ | |
| 30 | VJMP, /* info = instruction pc */ | |
| 31 | VRELOCABLE, /* info = instruction pc */ | |
| 32 | VNONRELOC, /* info = result register */ | |
| 33 | VCALL, /* info = instruction pc */ | |
| 34 | VVARARG /* info = instruction pc */ | |
| 35 | } expkind; | |
| 36 | ||
| 37 | typedef struct expdesc { | |
| 38 | expkind k; | |
| 39 | union { | |
| 40 | struct { int info, aux; } s; | |
| 41 | lua_Number nval; | |
| 42 | } u; | |
| 43 | int t; /* patch list of `exit when true' */ | |
| 44 | int f; /* patch list of `exit when false' */ | |
| 45 | } expdesc; | |
| 46 | ||
| 47 | ||
| 48 | typedef struct upvaldesc { | |
| 49 | lu_byte k; | |
| 50 | lu_byte info; | |
| 51 | } upvaldesc; | |
| 52 | ||
| 53 | ||
| 54 | struct BlockCnt; /* defined in lparser.c */ | |
| 55 | ||
| 56 | ||
| 57 | /* state needed to generate code for a given function */ | |
| 58 | typedef struct FuncState { | |
| 59 | Proto *f; /* current function header */ | |
| 60 | Table *h; /* table to find (and reuse) elements in `k' */ | |
| 61 | struct FuncState *prev; /* enclosing function */ | |
| 62 | struct LexState *ls; /* lexical state */ | |
| 63 | struct lua_State *L; /* copy of the Lua state */ | |
| 64 | struct BlockCnt *bl; /* chain of current blocks */ | |
| 65 | int pc; /* next position to code (equivalent to `ncode') */ | |
| 66 | int lasttarget; /* `pc' of last `jump target' */ | |
| 67 | int jpc; /* list of pending jumps to `pc' */ | |
| 68 | int freereg; /* first free register */ | |
| 69 | int nk; /* number of elements in `k' */ | |
| 70 | int np; /* number of elements in `p' */ | |
| 71 | short nlocvars; /* number of elements in `locvars' */ | |
| 72 | lu_byte nactvar; /* number of active local variables */ | |
| 73 | upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */ | |
| 74 | unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */ | |
| 75 | } FuncState; | |
| 76 | ||
| 77 | ||
| 78 | LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, | |
| 79 | const char *name); | |
| 80 | ||
| 81 | ||
| 82 | #endif | |
