| [1803] | 1 | /* |
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| 2 | ** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 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 | |
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| 7 | #ifndef lparser_h |
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| 8 | #define lparser_h |
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| 9 | |
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| 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 | |
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| 14 | |
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| 15 | /* |
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| 16 | ** Expression descriptor |
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| 17 | */ |
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| 18 | |
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| 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 | VLOCAL, /* info = local register */ |
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| 27 | VUPVAL, /* info = index of upvalue in `upvalues' */ |
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| 28 | VGLOBAL, /* info = index of table; aux = index of global name in `k' */ |
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| 29 | VINDEXED, /* info = table register; aux = index register (or `k') */ |
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| 30 | VJMP, /* info = instruction pc */ |
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| 31 | VRELOCABLE, /* info = instruction pc */ |
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| 32 | VNONRELOC, /* info = result register */ |
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| 33 | VCALL, /* info = instruction pc */ |
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| 34 | VVARARG /* info = instruction pc */ |
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| 35 | } expkind; |
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| 36 | |
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| 37 | typedef struct expdesc { |
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| 38 | expkind k; |
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| 39 | union { |
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| 40 | struct { int info, aux; } s; |
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| 41 | lua_Number nval; |
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| 42 | } u; |
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| 43 | int t; /* patch list of `exit when true' */ |
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| 44 | int f; /* patch list of `exit when false' */ |
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| 45 | } expdesc; |
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| 46 | |
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| 47 | |
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| 48 | typedef struct upvaldesc { |
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| 49 | lu_byte k; |
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| 50 | lu_byte info; |
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| 51 | } upvaldesc; |
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| 52 | |
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| 53 | |
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| 54 | struct BlockCnt; /* defined in lparser.c */ |
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| 55 | |
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| 56 | |
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| 57 | /* state needed to generate code for a given function */ |
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| 58 | typedef struct FuncState { |
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| 59 | Proto *f; /* current function header */ |
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| 60 | Table *h; /* table to find (and reuse) elements in `k' */ |
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| 61 | struct FuncState *prev; /* enclosing function */ |
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| 62 | struct LexState *ls; /* lexical state */ |
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| 63 | struct lua_State *L; /* copy of the Lua state */ |
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| 64 | struct BlockCnt *bl; /* chain of current blocks */ |
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| 65 | int pc; /* next position to code (equivalent to `ncode') */ |
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| 66 | int lasttarget; /* `pc' of last `jump target' */ |
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| 67 | int jpc; /* list of pending jumps to `pc' */ |
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| 68 | int freereg; /* first free register */ |
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| 69 | int nk; /* number of elements in `k' */ |
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| 70 | int np; /* number of elements in `p' */ |
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| 71 | short nlocvars; /* number of elements in `locvars' */ |
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| 72 | lu_byte nactvar; /* number of active local variables */ |
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| 73 | upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */ |
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| 74 | unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */ |
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| 75 | } FuncState; |
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| 76 | |
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| 77 | |
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| 78 | LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, |
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| 79 | const char *name); |
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| 80 | |
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| 81 | |
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| 82 | #endif |
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