[proxmark3-svn] / liblua / lobject.h

/*
** $Id: lobject.h,v 2.71 2012/09/11 18:21:44 roberto Exp $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/


#ifndef lobject_h
#define lobject_h


#include <stdarg.h>


#include "llimits.h"
#include "lua.h"


/*
** Extra tags for non-values
*/
#define LUA_TPROTO	LUA_NUMTAGS
#define LUA_TUPVAL	(LUA_NUMTAGS+1)
#define LUA_TDEADKEY	(LUA_NUMTAGS+2)

/*
** number of all possible tags (including LUA_TNONE but excluding DEADKEY)
*/
#define LUA_TOTALTAGS	(LUA_TUPVAL+2)


/*
** tags for Tagged Values have the following use of bits:
** bits 0-3: actual tag (a LUA_T* value)
** bits 4-5: variant bits
** bit 6: whether value is collectable
*/

#define VARBITS		(3 << 4)


/*
** LUA_TFUNCTION variants:
** 0 - Lua function
** 1 - light C function
** 2 - regular C function (closure)
*/

/* Variant tags for functions */
#define LUA_TLCL	(LUA_TFUNCTION | (0 << 4))  /* Lua closure */
#define LUA_TLCF	(LUA_TFUNCTION | (1 << 4))  /* light C function */
#define LUA_TCCL	(LUA_TFUNCTION | (2 << 4))  /* C closure */


/* Variant tags for strings */
#define LUA_TSHRSTR	(LUA_TSTRING | (0 << 4))  /* short strings */
#define LUA_TLNGSTR	(LUA_TSTRING | (1 << 4))  /* long strings */


/* Bit mark for collectable types */
#define BIT_ISCOLLECTABLE	(1 << 6)

/* mark a tag as collectable */
#define ctb(t)			((t) | BIT_ISCOLLECTABLE)


/*
** Union of all collectable objects
*/
typedef union GCObject GCObject;


/*
** Common Header for all collectable objects (in macro form, to be
** included in other objects)
*/
#define CommonHeader	GCObject *next; lu_byte tt; lu_byte marked


/*
** Common header in struct form
*/
typedef struct GCheader {
  CommonHeader;
} GCheader;


/*
** Union of all Lua values
*/
typedef union Value Value;


#define numfield	lua_Number n;    /* numbers */


/*
** Tagged Values. This is the basic representation of values in Lua,
** an actual value plus a tag with its type.
*/

#define TValuefields	Value value_; int tt_

typedef struct lua_TValue TValue;


/* macro defining a nil value */
#define NILCONSTANT	{NULL}, LUA_TNIL


#define val_(o)		((o)->value_)
#define num_(o)		(val_(o).n)


/* raw type tag of a TValue */
#define rttype(o)	((o)->tt_)

/* tag with no variants (bits 0-3) */
#define novariant(x)	((x) & 0x0F)

/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
#define ttype(o)	(rttype(o) & 0x3F)

/* type tag of a TValue with no variants (bits 0-3) */
#define ttypenv(o)	(novariant(rttype(o)))


/* Macros to test type */
#define checktag(o,t)		(rttype(o) == (t))
#define checktype(o,t)		(ttypenv(o) == (t))
#define ttisnumber(o)		checktag((o), LUA_TNUMBER)
#define ttisnil(o)		checktag((o), LUA_TNIL)
#define ttisboolean(o)		checktag((o), LUA_TBOOLEAN)
#define ttislightuserdata(o)	checktag((o), LUA_TLIGHTUSERDATA)
#define ttisstring(o)		checktype((o), LUA_TSTRING)
#define ttisshrstring(o)	checktag((o), ctb(LUA_TSHRSTR))
#define ttislngstring(o)	checktag((o), ctb(LUA_TLNGSTR))
#define ttistable(o)		checktag((o), ctb(LUA_TTABLE))
#define ttisfunction(o)		checktype(o, LUA_TFUNCTION)
#define ttisclosure(o)		((rttype(o) & 0x1F) == LUA_TFUNCTION)
#define ttisCclosure(o)		checktag((o), ctb(LUA_TCCL))
#define ttisLclosure(o)		checktag((o), ctb(LUA_TLCL))
#define ttislcf(o)		checktag((o), LUA_TLCF)
#define ttisuserdata(o)		checktag((o), ctb(LUA_TUSERDATA))
#define ttisthread(o)		checktag((o), ctb(LUA_TTHREAD))
#define ttisdeadkey(o)		checktag((o), LUA_TDEADKEY)

#define ttisequal(o1,o2)	(rttype(o1) == rttype(o2))

/* Macros to access values */
#define nvalue(o)	check_exp(ttisnumber(o), num_(o))
#define gcvalue(o)	check_exp(iscollectable(o), val_(o).gc)
#define pvalue(o)	check_exp(ttislightuserdata(o), val_(o).p)
#define rawtsvalue(o)	check_exp(ttisstring(o), &val_(o).gc->ts)
#define tsvalue(o)	(&rawtsvalue(o)->tsv)
#define rawuvalue(o)	check_exp(ttisuserdata(o), &val_(o).gc->u)
#define uvalue(o)	(&rawuvalue(o)->uv)
#define clvalue(o)	check_exp(ttisclosure(o), &val_(o).gc->cl)
#define clLvalue(o)	check_exp(ttisLclosure(o), &val_(o).gc->cl.l)
#define clCvalue(o)	check_exp(ttisCclosure(o), &val_(o).gc->cl.c)
#define fvalue(o)	check_exp(ttislcf(o), val_(o).f)
#define hvalue(o)	check_exp(ttistable(o), &val_(o).gc->h)
#define bvalue(o)	check_exp(ttisboolean(o), val_(o).b)
#define thvalue(o)	check_exp(ttisthread(o), &val_(o).gc->th)
/* a dead value may get the 'gc' field, but cannot access its contents */
#define deadvalue(o)	check_exp(ttisdeadkey(o), cast(void *, val_(o).gc))

#define l_isfalse(o)	(ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))


#define iscollectable(o)	(rttype(o) & BIT_ISCOLLECTABLE)


/* Macros for internal tests */
#define righttt(obj)		(ttype(obj) == gcvalue(obj)->gch.tt)

#define checkliveness(g,obj) \
	lua_longassert(!iscollectable(obj) || \
			(righttt(obj) && !isdead(g,gcvalue(obj))))


/* Macros to set values */
#define settt_(o,t)	((o)->tt_=(t))

#define setnvalue(obj,x) \
  { TValue *io=(obj); num_(io)=(x); settt_(io, LUA_TNUMBER); }

#define setnilvalue(obj) settt_(obj, LUA_TNIL)

#define setfvalue(obj,x) \
  { TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }

#define setpvalue(obj,x) \
  { TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }

#define setbvalue(obj,x) \
  { TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }

#define setgcovalue(L,obj,x) \
  { TValue *io=(obj); GCObject *i_g=(x); \
    val_(io).gc=i_g; settt_(io, ctb(gch(i_g)->tt)); }

#define setsvalue(L,obj,x) \
  { TValue *io=(obj); \
    TString *x_ = (x); \
    val_(io).gc=cast(GCObject *, x_); settt_(io, ctb(x_->tsv.tt)); \
    checkliveness(G(L),io); }

#define setuvalue(L,obj,x) \
  { TValue *io=(obj); \
    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TUSERDATA)); \
    checkliveness(G(L),io); }

#define setthvalue(L,obj,x) \
  { TValue *io=(obj); \
    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTHREAD)); \
    checkliveness(G(L),io); }

#define setclLvalue(L,obj,x) \
  { TValue *io=(obj); \
    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TLCL)); \
    checkliveness(G(L),io); }

#define setclCvalue(L,obj,x) \
  { TValue *io=(obj); \
    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TCCL)); \
    checkliveness(G(L),io); }

#define sethvalue(L,obj,x) \
  { TValue *io=(obj); \
    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTABLE)); \
    checkliveness(G(L),io); }

#define setdeadvalue(obj)	settt_(obj, LUA_TDEADKEY)


#define setobj(L,obj1,obj2) \
	{ const TValue *io2=(obj2); TValue *io1=(obj1); \
	  io1->value_ = io2->value_; io1->tt_ = io2->tt_; \
	  checkliveness(G(L),io1); }


/*
** different types of assignments, according to destination
*/

/* from stack to (same) stack */
#define setobjs2s	setobj
/* to stack (not from same stack) */
#define setobj2s	setobj
#define setsvalue2s	setsvalue
#define sethvalue2s	sethvalue
#define setptvalue2s	setptvalue
/* from table to same table */
#define setobjt2t	setobj
/* to table */
#define setobj2t	setobj
/* to new object */
#define setobj2n	setobj
#define setsvalue2n	setsvalue


/* check whether a number is valid (useful only for NaN trick) */
#define luai_checknum(L,o,c)	{ /* empty */ }


/*
** {======================================================
** NaN Trick
** =======================================================
*/
#if defined(LUA_NANTRICK)

/*
** numbers are represented in the 'd_' field. All other values have the
** value (NNMARK | tag) in 'tt__'. A number with such pattern would be
** a "signaled NaN", which is never generated by regular operations by
** the CPU (nor by 'strtod')
*/

/* allows for external implementation for part of the trick */
#if !defined(NNMARK)	/* { */


#if !defined(LUA_IEEEENDIAN)
#error option 'LUA_NANTRICK' needs 'LUA_IEEEENDIAN'
#endif


#define NNMARK		0x7FF7A500
#define NNMASK		0x7FFFFF00

#undef TValuefields
#undef NILCONSTANT

#if (LUA_IEEEENDIAN == 0)	/* { */

/* little endian */
#define TValuefields  \
	union { struct { Value v__; int tt__; } i; double d__; } u
#define NILCONSTANT	{{{NULL}, tag2tt(LUA_TNIL)}}
/* field-access macros */
#define v_(o)		((o)->u.i.v__)
#define d_(o)		((o)->u.d__)
#define tt_(o)		((o)->u.i.tt__)

#else				/* }{ */

/* big endian */
#define TValuefields  \
	union { struct { int tt__; Value v__; } i; double d__; } u
#define NILCONSTANT	{{tag2tt(LUA_TNIL), {NULL}}}
/* field-access macros */
#define v_(o)		((o)->u.i.v__)
#define d_(o)		((o)->u.d__)
#define tt_(o)		((o)->u.i.tt__)

#endif				/* } */

#endif			/* } */


/* correspondence with standard representation */
#undef val_
#define val_(o)		v_(o)
#undef num_
#define num_(o)		d_(o)


#undef numfield
#define numfield	/* no such field; numbers are the entire struct */

/* basic check to distinguish numbers from non-numbers */
#undef ttisnumber
#define ttisnumber(o)	((tt_(o) & NNMASK) != NNMARK)

#define tag2tt(t)	(NNMARK | (t))

#undef rttype
#define rttype(o)	(ttisnumber(o) ? LUA_TNUMBER : tt_(o) & 0xff)

#undef settt_
#define settt_(o,t)	(tt_(o) = tag2tt(t))

#undef setnvalue
#define setnvalue(obj,x) \
	{ TValue *io_=(obj); num_(io_)=(x); lua_assert(ttisnumber(io_)); }

#undef setobj
#define setobj(L,obj1,obj2) \
	{ const TValue *o2_=(obj2); TValue *o1_=(obj1); \
	  o1_->u = o2_->u; \
	  checkliveness(G(L),o1_); }


/*
** these redefinitions are not mandatory, but these forms are more efficient
*/

#undef checktag
#undef checktype
#define checktag(o,t)	(tt_(o) == tag2tt(t))
#define checktype(o,t)	(ctb(tt_(o) | VARBITS) == ctb(tag2tt(t) | VARBITS))

#undef ttisequal
#define ttisequal(o1,o2)  \
	(ttisnumber(o1) ? ttisnumber(o2) : (tt_(o1) == tt_(o2)))


#undef luai_checknum
#define luai_checknum(L,o,c)	{ if (!ttisnumber(o)) c; }

#endif
/* }====================================================== */


/*
** {======================================================
** types and prototypes
** =======================================================
*/


union Value {
  GCObject *gc;    /* collectable objects */
  void *p;         /* light userdata */
  int b;           /* booleans */
  lua_CFunction f; /* light C functions */
  numfield         /* numbers */
};


struct lua_TValue {
  TValuefields;
};


typedef TValue *StkId;  /* index to stack elements */


/*
** Header for string value; string bytes follow the end of this structure
*/
typedef union TString {
  L_Umaxalign dummy;  /* ensures maximum alignment for strings */
  struct {
    CommonHeader;
    lu_byte extra;  /* reserved words for short strings; "has hash" for longs */
    unsigned int hash;
    size_t len;  /* number of characters in string */
  } tsv;
} TString;


/* get the actual string (array of bytes) from a TString */
#define getstr(ts)	cast(const char *, (ts) + 1)

/* get the actual string (array of bytes) from a Lua value */
#define svalue(o)       getstr(rawtsvalue(o))


/*
** Header for userdata; memory area follows the end of this structure
*/
typedef union Udata {
  L_Umaxalign dummy;  /* ensures maximum alignment for `local' udata */
  struct {
    CommonHeader;
    struct Table *metatable;
    struct Table *env;
    size_t len;  /* number of bytes */
  } uv;
} Udata;


/*
** Description of an upvalue for function prototypes
*/
typedef struct Upvaldesc {
  TString *name;  /* upvalue name (for debug information) */
  lu_byte instack;  /* whether it is in stack */
  lu_byte idx;  /* index of upvalue (in stack or in outer function's list) */
} Upvaldesc;


/*
** Description of a local variable for function prototypes
** (used for debug information)
*/
typedef struct LocVar {
  TString *varname;
  int startpc;  /* first point where variable is active */
  int endpc;    /* first point where variable is dead */
} LocVar;


/*
** Function Prototypes
*/
typedef struct Proto {
  CommonHeader;
  TValue *k;  /* constants used by the function */
  Instruction *code;
  struct Proto **p;  /* functions defined inside the function */
  int *lineinfo;  /* map from opcodes to source lines (debug information) */
  LocVar *locvars;  /* information about local variables (debug information) */
  Upvaldesc *upvalues;  /* upvalue information */
  union Closure *cache;  /* last created closure with this prototype */
  TString  *source;  /* used for debug information */
  int sizeupvalues;  /* size of 'upvalues' */
  int sizek;  /* size of `k' */
  int sizecode;
  int sizelineinfo;
  int sizep;  /* size of `p' */
  int sizelocvars;
  int linedefined;
  int lastlinedefined;
  GCObject *gclist;
  lu_byte numparams;  /* number of fixed parameters */
  lu_byte is_vararg;
  lu_byte maxstacksize;  /* maximum stack used by this function */
} Proto;


/*
** Lua Upvalues
*/
typedef struct UpVal {
  CommonHeader;
  TValue *v;  /* points to stack or to its own value */
  union {
    TValue value;  /* the value (when closed) */
    struct {  /* double linked list (when open) */
      struct UpVal *prev;
      struct UpVal *next;
    } l;
  } u;
} UpVal;


/*
** Closures
*/

#define ClosureHeader \
	CommonHeader; lu_byte nupvalues; GCObject *gclist

typedef struct CClosure {
  ClosureHeader;
  lua_CFunction f;
  TValue upvalue[1];  /* list of upvalues */
} CClosure;


typedef struct LClosure {
  ClosureHeader;
  struct Proto *p;
  UpVal *upvals[1];  /* list of upvalues */
} LClosure;


typedef union Closure {
  CClosure c;
  LClosure l;
} Closure;


#define isLfunction(o)	ttisLclosure(o)

#define getproto(o)	(clLvalue(o)->p)


/*
** Tables
*/

typedef union TKey {
  struct {
    TValuefields;
    struct Node *next;  /* for chaining */
  } nk;
  TValue tvk;
} TKey;


typedef struct Node {
  TValue i_val;
  TKey i_key;
} Node;


typedef struct Table {
  CommonHeader;
  lu_byte flags;  /* 1<<p means tagmethod(p) is not present */
  lu_byte lsizenode;  /* log2 of size of `node' array */
  struct Table *metatable;
  TValue *array;  /* array part */
  Node *node;
  Node *lastfree;  /* any free position is before this position */
  GCObject *gclist;
  int sizearray;  /* size of `array' array */
} Table;


/*
** `module' operation for hashing (size is always a power of 2)
*/
#define lmod(s,size) \
	(check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))


#define twoto(x)	(1<<(x))
#define sizenode(t)	(twoto((t)->lsizenode))


/*
** (address of) a fixed nil value
*/
#define luaO_nilobject		(&luaO_nilobject_)


LUAI_DDEC const TValue luaO_nilobject_;


LUAI_FUNC int luaO_int2fb (unsigned int x);
LUAI_FUNC int luaO_fb2int (int x);
LUAI_FUNC int luaO_ceillog2 (unsigned int x);
LUAI_FUNC lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2);
LUAI_FUNC int luaO_str2d (const char *s, size_t len, lua_Number *result);
LUAI_FUNC int luaO_hexavalue (int c);
LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
                                                       va_list argp);
LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len);


#endif
Commit	Line	Data
ba8b5c17	1	/*
	2	** $Id: lobject.h,v 2.71 2012/09/11 18:21:44 roberto Exp $
	3	** Type definitions for Lua objects
	4	** See Copyright Notice in lua.h
	5	*/
	6
	7
	8	#ifndef lobject_h
	9	#define lobject_h
	10
	11
	12	#include <stdarg.h>
	13
	14
	15	#include "llimits.h"
	16	#include "lua.h"
	17
	18
	19	/*
	20	** Extra tags for non-values
	21	*/
	22	#define LUA_TPROTO LUA_NUMTAGS
	23	#define LUA_TUPVAL (LUA_NUMTAGS+1)
	24	#define LUA_TDEADKEY (LUA_NUMTAGS+2)
	25
	26	/*
	27	** number of all possible tags (including LUA_TNONE but excluding DEADKEY)
	28	*/
	29	#define LUA_TOTALTAGS (LUA_TUPVAL+2)
	30
	31
	32	/*
	33	** tags for Tagged Values have the following use of bits:
	34	** bits 0-3: actual tag (a LUA_T* value)
	35	** bits 4-5: variant bits
	36	** bit 6: whether value is collectable
	37	*/
	38
	39	#define VARBITS (3 << 4)
	40
	41
	42	/*
	43	** LUA_TFUNCTION variants:
	44	** 0 - Lua function
	45	** 1 - light C function
	46	** 2 - regular C function (closure)
	47	*/
	48
	49	/* Variant tags for functions */
	50	#define LUA_TLCL (LUA_TFUNCTION \| (0 << 4)) /* Lua closure */
	51	#define LUA_TLCF (LUA_TFUNCTION \| (1 << 4)) /* light C function */
	52	#define LUA_TCCL (LUA_TFUNCTION \| (2 << 4)) /* C closure */
	53
	54
	55	/* Variant tags for strings */
	56	#define LUA_TSHRSTR (LUA_TSTRING \| (0 << 4)) /* short strings */
	57	#define LUA_TLNGSTR (LUA_TSTRING \| (1 << 4)) /* long strings */
	58
	59
	60	/* Bit mark for collectable types */
	61	#define BIT_ISCOLLECTABLE (1 << 6)
	62
	63	/* mark a tag as collectable */
	64	#define ctb(t) ((t) \| BIT_ISCOLLECTABLE)
65
66
67	/*
68	** Union of all collectable objects
69	*/
70	typedef union GCObject GCObject;
71
72
73	/*
74	** Common Header for all collectable objects (in macro form, to be
75	** included in other objects)
76	*/
77	#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
78
79
80	/*
81	** Common header in struct form
82	*/
83	typedef struct GCheader {
84	CommonHeader;
85	} GCheader;
86
87
88
89	/*
90	** Union of all Lua values
91	*/
92	typedef union Value Value;
93
94
95	#define numfield lua_Number n; /* numbers */
96
97
98
99	/*
100	** Tagged Values. This is the basic representation of values in Lua,
101	** an actual value plus a tag with its type.
102	*/
103
104	#define TValuefields Value value_; int tt_
105
106	typedef struct lua_TValue TValue;
107
108
109	/* macro defining a nil value */
110	#define NILCONSTANT {NULL}, LUA_TNIL
111
112
113	#define val_(o) ((o)->value_)
114	#define num_(o) (val_(o).n)
115
116
117	/* raw type tag of a TValue */
118	#define rttype(o) ((o)->tt_)
119
120	/* tag with no variants (bits 0-3) */
121	#define novariant(x) ((x) & 0x0F)
122
123	/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
124	#define ttype(o) (rttype(o) & 0x3F)
125
126	/* type tag of a TValue with no variants (bits 0-3) */
127	#define ttypenv(o) (novariant(rttype(o)))
128
129
130	/* Macros to test type */
131	#define checktag(o,t) (rttype(o) == (t))
132	#define checktype(o,t) (ttypenv(o) == (t))
133	#define ttisnumber(o) checktag((o), LUA_TNUMBER)
134	#define ttisnil(o) checktag((o), LUA_TNIL)
135	#define ttisboolean(o) checktag((o), LUA_TBOOLEAN)
136	#define ttislightuserdata(o) checktag((o), LUA_TLIGHTUSERDATA)
137	#define ttisstring(o) checktype((o), LUA_TSTRING)
138	#define ttisshrstring(o) checktag((o), ctb(LUA_TSHRSTR))
139	#define ttislngstring(o) checktag((o), ctb(LUA_TLNGSTR))
140	#define ttistable(o) checktag((o), ctb(LUA_TTABLE))
141	#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
142	#define ttisclosure(o) ((rttype(o) & 0x1F) == LUA_TFUNCTION)
143	#define ttisCclosure(o) checktag((o), ctb(LUA_TCCL))
144	#define ttisLclosure(o) checktag((o), ctb(LUA_TLCL))
145	#define ttislcf(o) checktag((o), LUA_TLCF)
146	#define ttisuserdata(o) checktag((o), ctb(LUA_TUSERDATA))
147	#define ttisthread(o) checktag((o), ctb(LUA_TTHREAD))
148	#define ttisdeadkey(o) checktag((o), LUA_TDEADKEY)
149
150	#define ttisequal(o1,o2) (rttype(o1) == rttype(o2))
151
152	/* Macros to access values */
153	#define nvalue(o) check_exp(ttisnumber(o), num_(o))
154	#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc)
155	#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p)
156	#define rawtsvalue(o) check_exp(ttisstring(o), &val_(o).gc->ts)
157	#define tsvalue(o) (&rawtsvalue(o)->tsv)
158	#define rawuvalue(o) check_exp(ttisuserdata(o), &val_(o).gc->u)
159	#define uvalue(o) (&rawuvalue(o)->uv)
160	#define clvalue(o) check_exp(ttisclosure(o), &val_(o).gc->cl)
161	#define clLvalue(o) check_exp(ttisLclosure(o), &val_(o).gc->cl.l)
162	#define clCvalue(o) check_exp(ttisCclosure(o), &val_(o).gc->cl.c)
163	#define fvalue(o) check_exp(ttislcf(o), val_(o).f)
164	#define hvalue(o) check_exp(ttistable(o), &val_(o).gc->h)
165	#define bvalue(o) check_exp(ttisboolean(o), val_(o).b)
166	#define thvalue(o) check_exp(ttisthread(o), &val_(o).gc->th)
167	/* a dead value may get the 'gc' field, but cannot access its contents */
168	#define deadvalue(o) check_exp(ttisdeadkey(o), cast(void *, val_(o).gc))
169
170	#define l_isfalse(o) (ttisnil(o) \|\| (ttisboolean(o) && bvalue(o) == 0))
171
172
173	#define iscollectable(o) (rttype(o) & BIT_ISCOLLECTABLE)
174
175
176	/* Macros for internal tests */
177	#define righttt(obj) (ttype(obj) == gcvalue(obj)->gch.tt)
178
179	#define checkliveness(g,obj) \
180	lua_longassert(!iscollectable(obj) \|\| \
181	(righttt(obj) && !isdead(g,gcvalue(obj))))
182
183
184	/* Macros to set values */
185	#define settt_(o,t) ((o)->tt_=(t))
186
187	#define setnvalue(obj,x) \
188	{ TValue *io=(obj); num_(io)=(x); settt_(io, LUA_TNUMBER); }
189
190	#define setnilvalue(obj) settt_(obj, LUA_TNIL)
191
192	#define setfvalue(obj,x) \
193	{ TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }
194
195	#define setpvalue(obj,x) \
196	{ TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
197
198	#define setbvalue(obj,x) \
199	{ TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
200
201	#define setgcovalue(L,obj,x) \
202	{ TValue io=(obj); GCObject i_g=(x); \
203	val_(io).gc=i_g; settt_(io, ctb(gch(i_g)->tt)); }
204
205	#define setsvalue(L,obj,x) \
206	{ TValue *io=(obj); \
207	TString *x_ = (x); \
208	val_(io).gc=cast(GCObject *, x_); settt_(io, ctb(x_->tsv.tt)); \
209	checkliveness(G(L),io); }
210
211	#define setuvalue(L,obj,x) \
212	{ TValue *io=(obj); \
213	val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TUSERDATA)); \
214	checkliveness(G(L),io); }
215
216	#define setthvalue(L,obj,x) \
217	{ TValue *io=(obj); \
218	val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTHREAD)); \
219	checkliveness(G(L),io); }
220
221	#define setclLvalue(L,obj,x) \
222	{ TValue *io=(obj); \
223	val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TLCL)); \
224	checkliveness(G(L),io); }
225
226	#define setclCvalue(L,obj,x) \
227	{ TValue *io=(obj); \
228	val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TCCL)); \
229	checkliveness(G(L),io); }
230
231	#define sethvalue(L,obj,x) \
232	{ TValue *io=(obj); \
233	val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTABLE)); \
234	checkliveness(G(L),io); }
235
236	#define setdeadvalue(obj) settt_(obj, LUA_TDEADKEY)
237
238
239
240	#define setobj(L,obj1,obj2) \
241	{ const TValue io2=(obj2); TValue io1=(obj1); \
242	io1->value_ = io2->value_; io1->tt_ = io2->tt_; \
243	checkliveness(G(L),io1); }
244
245
246	/*
247	** different types of assignments, according to destination
248	*/
249
250	/* from stack to (same) stack */
251	#define setobjs2s setobj
252	/* to stack (not from same stack) */
253	#define setobj2s setobj
254	#define setsvalue2s setsvalue
255	#define sethvalue2s sethvalue
256	#define setptvalue2s setptvalue
257	/* from table to same table */
258	#define setobjt2t setobj
259	/* to table */
260	#define setobj2t setobj
261	/* to new object */
262	#define setobj2n setobj
263	#define setsvalue2n setsvalue
264
265
266	/* check whether a number is valid (useful only for NaN trick) */
267	#define luai_checknum(L,o,c) { /* empty */ }
268
269
270	/*
271	** {======================================================
272	** NaN Trick
273	** =======================================================
274	*/
275	#if defined(LUA_NANTRICK)
276
277	/*
278	** numbers are represented in the 'd_' field. All other values have the
279	** value (NNMARK \| tag) in 'tt__'. A number with such pattern would be
280	** a "signaled NaN", which is never generated by regular operations by
281	** the CPU (nor by 'strtod')
282	*/
283
284	/* allows for external implementation for part of the trick */
285	#if !defined(NNMARK) /* { */
286
287
288	#if !defined(LUA_IEEEENDIAN)
289	#error option 'LUA_NANTRICK' needs 'LUA_IEEEENDIAN'
290	#endif
291
292
293	#define NNMARK 0x7FF7A500
294	#define NNMASK 0x7FFFFF00
295
296	#undef TValuefields
297	#undef NILCONSTANT
298
299	#if (LUA_IEEEENDIAN == 0) /* { */
300
301	/* little endian */
302	#define TValuefields \
303	union { struct { Value v__; int tt__; } i; double d__; } u
304	#define NILCONSTANT {{{NULL}, tag2tt(LUA_TNIL)}}
305	/* field-access macros */
306	#define v_(o) ((o)->u.i.v__)
307	#define d_(o) ((o)->u.d__)
308	#define tt_(o) ((o)->u.i.tt__)
309
310	#else /* }{ */
311
312	/* big endian */
313	#define TValuefields \
314	union { struct { int tt__; Value v__; } i; double d__; } u
315	#define NILCONSTANT {{tag2tt(LUA_TNIL), {NULL}}}
316	/* field-access macros */
317	#define v_(o) ((o)->u.i.v__)
318	#define d_(o) ((o)->u.d__)
319	#define tt_(o) ((o)->u.i.tt__)
320
321	#endif /* } */
322
323	#endif /* } */
324
325
326	/* correspondence with standard representation */
327	#undef val_
328	#define val_(o) v_(o)
329	#undef num_
330	#define num_(o) d_(o)
331
332
333	#undef numfield
334	#define numfield /* no such field; numbers are the entire struct */
335
336	/* basic check to distinguish numbers from non-numbers */
337	#undef ttisnumber
338	#define ttisnumber(o) ((tt_(o) & NNMASK) != NNMARK)
339
340	#define tag2tt(t) (NNMARK \| (t))
341
342	#undef rttype
343	#define rttype(o) (ttisnumber(o) ? LUA_TNUMBER : tt_(o) & 0xff)
344
345	#undef settt_
346	#define settt_(o,t) (tt_(o) = tag2tt(t))
347
348	#undef setnvalue
349	#define setnvalue(obj,x) \
350	{ TValue *io_=(obj); num_(io_)=(x); lua_assert(ttisnumber(io_)); }
351
352	#undef setobj
353	#define setobj(L,obj1,obj2) \
354	{ const TValue o2_=(obj2); TValue o1_=(obj1); \
355	o1_->u = o2_->u; \
356	checkliveness(G(L),o1_); }
357
358
359	/*
360	** these redefinitions are not mandatory, but these forms are more efficient
361	*/
362
363	#undef checktag
364	#undef checktype
365	#define checktag(o,t) (tt_(o) == tag2tt(t))
366	#define checktype(o,t) (ctb(tt_(o) \| VARBITS) == ctb(tag2tt(t) \| VARBITS))
367
368	#undef ttisequal
369	#define ttisequal(o1,o2) \
370	(ttisnumber(o1) ? ttisnumber(o2) : (tt_(o1) == tt_(o2)))
371
372
373	#undef luai_checknum
374	#define luai_checknum(L,o,c) { if (!ttisnumber(o)) c; }
375
376	#endif
377	/* }====================================================== */
378
379
380
381	/*
382	** {======================================================
383	** types and prototypes
384	** =======================================================
385	*/
386
387
388	union Value {
389	GCObject gc; / collectable objects */
390	void p; / light userdata */
391	int b; /* booleans */
392	lua_CFunction f; /* light C functions */
393	numfield /* numbers */
394	};
395
396
397	struct lua_TValue {
398	TValuefields;
399	};
400
401
402	typedef TValue StkId; / index to stack elements */
403
404
405
406
407	/*
408	** Header for string value; string bytes follow the end of this structure
409	*/
410	typedef union TString {
411	L_Umaxalign dummy; /* ensures maximum alignment for strings */
412	struct {
413	CommonHeader;
414	lu_byte extra; /* reserved words for short strings; "has hash" for longs */
415	unsigned int hash;
416	size_t len; /* number of characters in string */
417	} tsv;
418	} TString;
419
420
421	/* get the actual string (array of bytes) from a TString */
422	#define getstr(ts) cast(const char *, (ts) + 1)
423
424	/* get the actual string (array of bytes) from a Lua value */
425	#define svalue(o) getstr(rawtsvalue(o))
426
427
428	/*
429	** Header for userdata; memory area follows the end of this structure
430	*/
431	typedef union Udata {
432	L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
433	struct {
434	CommonHeader;
435	struct Table *metatable;
436	struct Table *env;
437	size_t len; /* number of bytes */
438	} uv;
439	} Udata;
440
441
442
443	/*
444	** Description of an upvalue for function prototypes
445	*/
446	typedef struct Upvaldesc {
447	TString name; / upvalue name (for debug information) */
448	lu_byte instack; /* whether it is in stack */
449	lu_byte idx; /* index of upvalue (in stack or in outer function's list) */
450	} Upvaldesc;
451
452
453	/*
454	** Description of a local variable for function prototypes
455	** (used for debug information)
456	*/
457	typedef struct LocVar {
458	TString *varname;
459	int startpc; /* first point where variable is active */
460	int endpc; /* first point where variable is dead */
461	} LocVar;
462
463
464	/*
465	** Function Prototypes
466	*/
467	typedef struct Proto {
468	CommonHeader;
469	TValue k; / constants used by the function */
470	Instruction *code;
471	struct Proto *p; / functions defined inside the function */
472	int lineinfo; / map from opcodes to source lines (debug information) */
473	LocVar locvars; / information about local variables (debug information) */
474	Upvaldesc upvalues; / upvalue information */
475	union Closure cache; / last created closure with this prototype */
476	TString source; / used for debug information */
477	int sizeupvalues; /* size of 'upvalues' */
478	int sizek; /* size of `k' */
479	int sizecode;
480	int sizelineinfo;
481	int sizep; /* size of `p' */
482	int sizelocvars;
483	int linedefined;
484	int lastlinedefined;
485	GCObject *gclist;
486	lu_byte numparams; /* number of fixed parameters */
487	lu_byte is_vararg;
488	lu_byte maxstacksize; /* maximum stack used by this function */
489	} Proto;
490
491
492
493	/*
494	** Lua Upvalues
495	*/
496	typedef struct UpVal {
497	CommonHeader;
498	TValue v; / points to stack or to its own value */
499	union {
500	TValue value; /* the value (when closed) */
501	struct { /* double linked list (when open) */
502	struct UpVal *prev;
503	struct UpVal *next;
504	} l;
505	} u;
506	} UpVal;
507
508
509	/*
510	** Closures
511	*/
512
513	#define ClosureHeader \
514	CommonHeader; lu_byte nupvalues; GCObject *gclist
515
516	typedef struct CClosure {
517	ClosureHeader;
518	lua_CFunction f;
519	TValue upvalue[1]; /* list of upvalues */
520	} CClosure;
521
522
523	typedef struct LClosure {
524	ClosureHeader;
525	struct Proto *p;
526	UpVal upvals[1]; / list of upvalues */
527	} LClosure;
528
529
530	typedef union Closure {
531	CClosure c;
532	LClosure l;
533	} Closure;
534
535
536	#define isLfunction(o) ttisLclosure(o)
537
538	#define getproto(o) (clLvalue(o)->p)
539
540
541	/*
542	** Tables
543	*/
544
545	typedef union TKey {
546	struct {
547	TValuefields;
548	struct Node next; / for chaining */
549	} nk;
550	TValue tvk;
551	} TKey;
552
553
554	typedef struct Node {
555	TValue i_val;
556	TKey i_key;
557	} Node;
558
559
560	typedef struct Table {
561	CommonHeader;
562	lu_byte flags; /* 1<<p means tagmethod(p) is not present */
563	lu_byte lsizenode; /* log2 of size of `node' array */
564	struct Table *metatable;
565	TValue array; / array part */
566	Node *node;
567	Node lastfree; / any free position is before this position */
568	GCObject *gclist;
569	int sizearray; /* size of `array' array */
570	} Table;
571
572
573
574	/*
575	** `module' operation for hashing (size is always a power of 2)
576	*/
577	#define lmod(s,size) \
578	(check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))
579
580
581	#define twoto(x) (1<<(x))
582	#define sizenode(t) (twoto((t)->lsizenode))
583
584
585	/*
586	** (address of) a fixed nil value
587	*/
588	#define luaO_nilobject (&luaO_nilobject_)
589
590
591	LUAI_DDEC const TValue luaO_nilobject_;
592
593
594	LUAI_FUNC int luaO_int2fb (unsigned int x);
595	LUAI_FUNC int luaO_fb2int (int x);
596	LUAI_FUNC int luaO_ceillog2 (unsigned int x);
597	LUAI_FUNC lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2);
598	LUAI_FUNC int luaO_str2d (const char s, size_t len, lua_Number result);
599	LUAI_FUNC int luaO_hexavalue (int c);
600	LUAI_FUNC const char luaO_pushvfstring (lua_State L, const char *fmt,
601	va_list argp);
602	LUAI_FUNC const char luaO_pushfstring (lua_State L, const char *fmt, ...);
603	LUAI_FUNC void luaO_chunkid (char out, const char source, size_t len);
604
605
606	#endif
607