[proxmark3-svn] / liblua / lparser.h

/*
** $Id: lparser.h,v 1.70 2012/05/08 13:53:33 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 */
  VNONRELOC,	/* info = result register */
  VLOCAL,	/* info = local register */
  VUPVAL,       /* info = index of upvalue in 'upvalues' */
  VINDEXED,	/* t = table register/upvalue; idx = index R/K */
  VJMP,		/* info = instruction pc */
  VRELOCABLE,	/* info = instruction pc */
  VCALL,	/* info = instruction pc */
  VVARARG	/* info = instruction pc */
} expkind;


#define vkisvar(k)	(VLOCAL <= (k) && (k) <= VINDEXED)
#define vkisinreg(k)	((k) == VNONRELOC || (k) == VLOCAL)

typedef struct expdesc {
  expkind k;
  union {
    struct {  /* for indexed variables (VINDEXED) */
      short idx;  /* index (R/K) */
      lu_byte t;  /* table (register or upvalue) */
      lu_byte vt;  /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */
    } ind;
    int info;  /* for generic use */
    lua_Number nval;  /* for VKNUM */
  } u;
  int t;  /* patch list of `exit when true' */
  int f;  /* patch list of `exit when false' */
} expdesc;


/* description of active local variable */
typedef struct Vardesc {
  short idx;  /* variable index in stack */
} Vardesc;


/* description of pending goto statements and label statements */
typedef struct Labeldesc {
  TString *name;  /* label identifier */
  int pc;  /* position in code */
  int line;  /* line where it appeared */
  lu_byte nactvar;  /* local level where it appears in current block */
} Labeldesc;


/* list of labels or gotos */
typedef struct Labellist {
  Labeldesc *arr;  /* array */
  int n;  /* number of entries in use */
  int size;  /* array size */
} Labellist;


/* dynamic structures used by the parser */
typedef struct Dyndata {
  struct {  /* list of active local variables */
    Vardesc *arr;
    int n;
    int size;
  } actvar;
  Labellist gt;  /* list of pending gotos */
  Labellist label;   /* list of active labels */
} Dyndata;


/* control of blocks */
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 BlockCnt *bl;  /* chain of current blocks */
  int pc;  /* next position to code (equivalent to `ncode') */
  int lasttarget;   /* 'label' of last 'jump label' */
  int jpc;  /* list of pending jumps to `pc' */
  int nk;  /* number of elements in `k' */
  int np;  /* number of elements in `p' */
  int firstlocal;  /* index of first local var (in Dyndata array) */
  short nlocvars;  /* number of elements in 'f->locvars' */
  lu_byte nactvar;  /* number of active local variables */
  lu_byte nups;  /* number of upvalues */
  lu_byte freereg;  /* first free register */
} FuncState;


LUAI_FUNC Closure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
                                Dyndata *dyd, const char *name, int firstchar);


#endif
Commit	Line	Data
ba8b5c17	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