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Commit	Line	Data
	1	/*
	2	** $Id: lparser.h,v 1.70 2012/05/08 13:53:33 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
	19	typedef 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	VNONRELOC, /* info = result register */
	27	VLOCAL, /* info = local register */
	28	VUPVAL, /* info = index of upvalue in 'upvalues' */
	29	VINDEXED, /* t = table register/upvalue; idx = index R/K */
	30	VJMP, /* info = instruction pc */
	31	VRELOCABLE, /* info = instruction pc */
	32	VCALL, /* info = instruction pc */
	33	VVARARG /* info = instruction pc */
	34	} expkind;
	35
	36
	37	#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED)
	38	#define vkisinreg(k) ((k) == VNONRELOC \|\| (k) == VLOCAL)
	39
	40	typedef struct expdesc {
	41	expkind k;
	42	union {
	43	struct { /* for indexed variables (VINDEXED) */
	44	short idx; /* index (R/K) */
	45	lu_byte t; /* table (register or upvalue) */
	46	lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */
	47	} ind;
	48	int info; /* for generic use */
	49	lua_Number nval; /* for VKNUM */
	50	} u;
	51	int t; /* patch list of `exit when true' */
	52	int f; /* patch list of `exit when false' */
	53	} expdesc;
	54
	55
	56	/* description of active local variable */
	57	typedef struct Vardesc {
	58	short idx; /* variable index in stack */
	59	} Vardesc;
	60
	61
	62	/* description of pending goto statements and label statements */
	63	typedef struct Labeldesc {
	64	TString name; / label identifier */
	65	int pc; /* position in code */
	66	int line; /* line where it appeared */
	67	lu_byte nactvar; /* local level where it appears in current block */
	68	} Labeldesc;
	69
	70
	71	/* list of labels or gotos */
	72	typedef struct Labellist {
	73	Labeldesc arr; / array */
	74	int n; /* number of entries in use */
	75	int size; /* array size */
	76	} Labellist;
	77
	78
	79	/* dynamic structures used by the parser */
	80	typedef struct Dyndata {
	81	struct { /* list of active local variables */
	82	Vardesc *arr;
	83	int n;
	84	int size;
	85	} actvar;
	86	Labellist gt; /* list of pending gotos */
	87	Labellist label; /* list of active labels */
	88	} Dyndata;
	89
	90
	91	/* control of blocks */
	92	struct BlockCnt; /* defined in lparser.c */
	93
	94
	95	/* state needed to generate code for a given function */
	96	typedef struct FuncState {
	97	Proto f; / current function header */
	98	Table h; / table to find (and reuse) elements in `k' */
	99	struct FuncState prev; / enclosing function */
	100	struct LexState ls; / lexical state */
	101	struct BlockCnt bl; / chain of current blocks */
	102	int pc; /* next position to code (equivalent to `ncode') */
	103	int lasttarget; /* 'label' of last 'jump label' */
	104	int jpc; /* list of pending jumps to `pc' */
	105	int nk; /* number of elements in `k' */
	106	int np; /* number of elements in `p' */
	107	int firstlocal; /* index of first local var (in Dyndata array) */
	108	short nlocvars; /* number of elements in 'f->locvars' */
	109	lu_byte nactvar; /* number of active local variables */
	110	lu_byte nups; /* number of upvalues */
	111	lu_byte freereg; /* first free register */
	112	} FuncState;
	113
	114
	115	LUAI_FUNC Closure luaY_parser (lua_State L, ZIO z, Mbuffer buff,
	116	Dyndata dyd, const char name, int firstchar);
	117
	118
	119	#endif