| /* |
| ** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp $ |
| ** 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 */ |
| } FuncState; |
| |
| |
| LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, |
| const char *name); |
| |
| |
| #endif |