/script_binding/lua/lua/lparser.h
C++ Header | 82 lines | 57 code | 16 blank | 9 comment | 0 complexity | 85895dd17a4e1bb0ee81c191b0e64b5d MD5 | raw file
1/* 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 19typedef 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 37typedef 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 48typedef struct upvaldesc { 49 lu_byte k; 50 lu_byte info; 51} upvaldesc; 52 53 54struct BlockCnt; /* defined in lparser.c */ 55 56 57/* state needed to generate code for a given function */ 58typedef 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 78LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, 79 const char *name); 80 81 82#endif