lparser.h
上传用户:yisoukefu
上传日期:2020-08-09
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文件大小:2k
- /*
- ** $Id: lparser.h,v 1.56 2005/10/03 14:02:40 roberto Exp $
- ** Lua Parser
- ** See Copyright Notice in lua.h
- */
- #ifndef lparser_h
- #define lparser_h
- #include "llimits.h"
- #include "lobject.h"
- #include "ltable.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 */
- } FuncState;
- LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
- const char *name);
- #endif