1/* $NetBSD$ */ 2 3/* 4** Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp 5** Lua Parser 6** See Copyright Notice in lua.h 7*/ 8 9#ifndef lparser_h 10#define lparser_h 11 12#include "llimits.h" 13#include "lobject.h" 14#include "lzio.h" 15 16 17/* 18** Expression descriptor 19*/ 20 21typedef enum { 22 VVOID, /* no value */ 23 VNIL, 24 VTRUE, 25 VFALSE, 26 VK, /* info = index of constant in `k' */ 27 VKNUM, /* nval = numerical value */ 28 VLOCAL, /* info = local register */ 29 VUPVAL, /* info = index of upvalue in `upvalues' */ 30 VGLOBAL, /* info = index of table; aux = index of global name in `k' */ 31 VINDEXED, /* info = table register; aux = index register (or `k') */ 32 VJMP, /* info = instruction pc */ 33 VRELOCABLE, /* info = instruction pc */ 34 VNONRELOC, /* info = result register */ 35 VCALL, /* info = instruction pc */ 36 VVARARG /* info = instruction pc */ 37} expkind; 38 39typedef struct expdesc { 40 expkind k; 41 union { 42 struct { int info, aux; } s; 43 lua_Number nval; 44 } u; 45 int t; /* patch list of `exit when true' */ 46 int f; /* patch list of `exit when false' */ 47} expdesc; 48 49 50typedef struct upvaldesc { 51 lu_byte k; 52 lu_byte info; 53} upvaldesc; 54 55 56struct BlockCnt; /* defined in lparser.c */ 57 58 59/* state needed to generate code for a given function */ 60typedef struct FuncState { 61 Proto *f; /* current function header */ 62 Table *h; /* table to find (and reuse) elements in `k' */ 63 struct FuncState *prev; /* enclosing function */ 64 struct LexState *ls; /* lexical state */ 65 struct lua_State *L; /* copy of the Lua state */ 66 struct BlockCnt *bl; /* chain of current blocks */ 67 int pc; /* next position to code (equivalent to `ncode') */ 68 int lasttarget; /* `pc' of last `jump target' */ 69 int jpc; /* list of pending jumps to `pc' */ 70 int freereg; /* first free register */ 71 int nk; /* number of elements in `k' */ 72 int np; /* number of elements in `p' */ 73 short nlocvars; /* number of elements in `locvars' */ 74 lu_byte nactvar; /* number of active local variables */ 75 upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */ 76 unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */ 77} FuncState; 78 79 80LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, 81 const char *name); 82 83 84#endif 85