mirror of
https://github.com/lua/lua
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120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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** $Id: lparser.h,v 1.70 2012/05/08 13:53:33 roberto Exp $
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** Lua Parser
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** See Copyright Notice in lua.h
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*/
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#ifndef lparser_h
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#define lparser_h
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#include "llimits.h"
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#include "lobject.h"
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#include "lzio.h"
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/*
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** Expression descriptor
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*/
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typedef enum {
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VVOID, /* no value */
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VNIL,
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VTRUE,
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VFALSE,
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VK, /* info = index of constant in `k' */
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VKNUM, /* nval = numerical value */
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VNONRELOC, /* info = result register */
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VLOCAL, /* info = local register */
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VUPVAL, /* info = index of upvalue in 'upvalues' */
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VINDEXED, /* t = table register/upvalue; idx = index R/K */
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VJMP, /* info = instruction pc */
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VRELOCABLE, /* info = instruction pc */
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VCALL, /* info = instruction pc */
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VVARARG /* info = instruction pc */
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} expkind;
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#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED)
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#define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL)
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typedef struct expdesc {
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expkind k;
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union {
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struct { /* for indexed variables (VINDEXED) */
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short idx; /* index (R/K) */
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lu_byte t; /* table (register or upvalue) */
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lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */
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} ind;
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int info; /* for generic use */
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lua_Number nval; /* for VKNUM */
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} u;
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int t; /* patch list of `exit when true' */
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int f; /* patch list of `exit when false' */
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} expdesc;
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/* description of active local variable */
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typedef struct Vardesc {
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short idx; /* variable index in stack */
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} Vardesc;
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/* description of pending goto statements and label statements */
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typedef struct Labeldesc {
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TString *name; /* label identifier */
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int pc; /* position in code */
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int line; /* line where it appeared */
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lu_byte nactvar; /* local level where it appears in current block */
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} Labeldesc;
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/* list of labels or gotos */
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typedef struct Labellist {
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Labeldesc *arr; /* array */
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int n; /* number of entries in use */
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int size; /* array size */
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} Labellist;
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/* dynamic structures used by the parser */
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typedef struct Dyndata {
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struct { /* list of active local variables */
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Vardesc *arr;
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int n;
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int size;
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} actvar;
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Labellist gt; /* list of pending gotos */
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Labellist label; /* list of active labels */
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} Dyndata;
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/* control of blocks */
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struct BlockCnt; /* defined in lparser.c */
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/* state needed to generate code for a given function */
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typedef struct FuncState {
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Proto *f; /* current function header */
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Table *h; /* table to find (and reuse) elements in `k' */
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struct FuncState *prev; /* enclosing function */
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struct LexState *ls; /* lexical state */
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struct BlockCnt *bl; /* chain of current blocks */
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int pc; /* next position to code (equivalent to `ncode') */
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int lasttarget; /* 'label' of last 'jump label' */
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int jpc; /* list of pending jumps to `pc' */
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int nk; /* number of elements in `k' */
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int np; /* number of elements in `p' */
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int firstlocal; /* index of first local var (in Dyndata array) */
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short nlocvars; /* number of elements in 'f->locvars' */
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lu_byte nactvar; /* number of active local variables */
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lu_byte nups; /* number of upvalues */
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lu_byte freereg; /* first free register */
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} FuncState;
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LUAI_FUNC Closure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
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Dyndata *dyd, const char *name, int firstchar);
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#endif
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