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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687/*** Lua Parser** See Copyright Notice in lua.h*/
#ifndef lparser_h#define lparser_h
#include "llimits.h"#include "lobject.h"#include "lzio.h"
/*** Expression descriptor*/
typedef enum { VVOID, /* no value */ VNIL, VTRUE, VFALSE, VK, /* info = index of constant in `k' */ VKNUM, /* nval = numerical value */ VLOCAL, /* info = local register */ VUPVAL, /* info = index of upvalue in `upvalues' */ VGLOBAL, /* info = index of table; aux = index of global name in `k' */ VINDEXED, /* info = table register; aux = index register (or `k') */ VJMP, /* info = instruction pc */ VRELOCABLE, /* info = instruction pc */ VNONRELOC, /* info = result register */ VCALL, /* info = instruction pc */ VVARARG /* info = instruction pc */} expkind;
typedef struct expdesc { expkind k; union { struct { int info, aux; } s; lua_Number nval; } u; int t; /* patch list of `exit when true' */ int f; /* patch list of `exit when false' */} expdesc;
typedef struct upvaldesc { lu_byte k; lu_byte info;} upvaldesc;
struct BlockCnt; /* defined in lparser.c */
/* state needed to generate code for a given function */typedef struct FuncState { Proto *f; /* current function header */ Table *h; /* table to find (and reuse) elements in `k' */ struct FuncState *prev; /* enclosing function */ struct LexState *ls; /* lexical state */ struct lua_State *L; /* copy of the Lua state */ struct BlockCnt *bl; /* chain of current blocks */ int pc; /* next position to code (equivalent to `ncode') */ int lasttarget; /* `pc' of last `jump target' */ int jpc; /* list of pending jumps to `pc' */ int freereg; /* first free register */ int nk; /* number of elements in `k' */ int np; /* number of elements in `p' */ short nlocvars; /* number of elements in `locvars' */ lu_byte nactvar; /* number of active local variables */ upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */ unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */#ifdef LUA_OPTIMIZE_DEBUG int lastline; /* only used during compilation for line info */ int lastlineOffset; /* ditto */ int lineinfoLastPC; /* ditto */#endif} FuncState;
LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, const char *name);
#endif