Lua2RTT/lua-5.1.4/lobject.h

/*
** $Id: lobject.h,v 2.20.1.2 2008/08/06 13:29:48 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"


/* tags for values visible from Lua */
#define LAST_TAG    LUA_TTHREAD

#define NUM_TAGS    (LAST_TAG+1)

/* mask for 'read-only' objects. must match READONLYBIT in lgc.h' */
#define READONLYMASK  128


/*
** Extra tags for non-values
*/
#define LUA_TPROTO  (LAST_TAG+1)
#define LUA_TUPVAL  (LAST_TAG+2)
#define LUA_TDEADKEY    (LAST_TAG+3)


/*
** 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
*/
#if defined( LUA_PACK_VALUE ) && defined( ELUA_ENDIAN_BIG )
typedef union
{
    struct
    {
        int _pad0;
        GCObject *gc;
    };
    struct
    {
        int _pad1;
        void *p;
    };
    lua_Number n;
    struct
    {
        int _pad2;
        int b;
    };
} Value;
#else // #if defined( LUA_PACK_VALUE ) && defined( ELUA_ENDIAN_BIG )
typedef union
{
    GCObject *gc;
    void *p;
    lua_Number n;
    int b;
} Value;
#endif // #if defined( LUA_PACK_VALUE ) && defined( ELUA_ENDIAN_BIG )

/*
** Tagged Values
*/

#ifndef LUA_PACK_VALUE
#define TValuefields    Value value; int tt
#define LUA_TVALUE_NIL {NULL}, LUA_TNIL

typedef struct lua_TValue
{
    TValuefields;
} TValue;
#else // #ifndef LUA_PACK_VALUE
#ifdef ELUA_ENDIAN_LITTLE
#define TValuefields union { \
  struct { \
    int _pad0; \
    int tt_sig; \
  } _ts; \
  struct { \
    int _pad; \
    short tt; \
    short sig; \
  } _t; \
  Value value; \
}
#define LUA_TVALUE_NIL {0, add_sig(LUA_TNIL)}
#else // #ifdef ELUA_ENDIAN_LITTLE
#define TValuefields union { \
  struct { \
    int tt_sig; \
    int _pad0; \
  } _ts; \
  struct { \
    short sig; \
    short tt; \
    int _pad; \
  } _t; \
  Value value; \
}
#define LUA_TVALUE_NIL {add_sig(LUA_TNIL), 0}
#endif // #ifdef ELUA_ENDIAN_LITTLE
#define LUA_NOTNUMBER_SIG (-1)
#define add_sig(tt) ( 0xffff0000 | (tt) )

typedef TValuefields TValue;
#endif // #ifndef LUA_PACK_VALUE

/* Macros to test type */
#ifndef LUA_PACK_VALUE
#define ttisnil(o)  (ttype(o) == LUA_TNIL)
#define ttisnumber(o)   (ttype(o) == LUA_TNUMBER)
#define ttisstring(o)   (ttype(o) == LUA_TSTRING)
#define ttistable(o)    (ttype(o) == LUA_TTABLE)
#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
#define ttisboolean(o)  (ttype(o) == LUA_TBOOLEAN)
#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
#define ttisthread(o)   (ttype(o) == LUA_TTHREAD)
#define ttislightuserdata(o)    (ttype(o) == LUA_TLIGHTUSERDATA)
#define ttisrotable(o) (ttype(o) == LUA_TROTABLE)
#define ttislightfunction(o)  (ttype(o) == LUA_TLIGHTFUNCTION)
#else // #ifndef LUA_PACK_VALUE
#define ttisnil(o) (ttype_sig(o) == add_sig(LUA_TNIL))
#define ttisnumber(o)  ((o)->_t.sig != LUA_NOTNUMBER_SIG)
#define ttisstring(o)  (ttype_sig(o) == add_sig(LUA_TSTRING))
#define ttistable(o) (ttype_sig(o) == add_sig(LUA_TTABLE))
#define ttisfunction(o)  (ttype_sig(o) == add_sig(LUA_TFUNCTION))
#define ttisboolean(o) (ttype_sig(o) == add_sig(LUA_TBOOLEAN))
#define ttisuserdata(o)  (ttype_sig(o) == add_sig(LUA_TUSERDATA))
#define ttisthread(o)  (ttype_sig(o) == add_sig(LUA_TTHREAD))
#define ttislightuserdata(o) (ttype_sig(o) == add_sig(LUA_TLIGHTUSERDATA))
#define ttisrotable(o) (ttype_sig(o) == add_sig(LUA_TROTABLE))
#define ttislightfunction(o)  (ttype_sig(o) == add_sig(LUA_TLIGHTFUNCTION))
#endif // #ifndef LUA_PACK_VALUE

/* Macros to access values */
#ifndef LUA_PACK_VALUE
#define ttype(o)    ((o)->tt)
#else // #ifndef LUA_PACK_VALUE
#define ttype(o)    ((o)->_t.sig == LUA_NOTNUMBER_SIG ? (o)->_t.tt : LUA_TNUMBER)
#define ttype_sig(o)    ((o)->_ts.tt_sig)
#endif // #ifndef LUA_PACK_VALUE
#define gcvalue(o)  check_exp(iscollectable(o), (o)->value.gc)
#define pvalue(o)   check_exp(ttislightuserdata(o), (o)->value.p)
#define rvalue(o)   check_exp(ttisrotable(o), (o)->value.p)
#define fvalue(o) check_exp(ttislightfunction(o), (o)->value.p)
#define nvalue(o)   check_exp(ttisnumber(o), (o)->value.n)
#define rawtsvalue(o)   check_exp(ttisstring(o), &(o)->value.gc->ts)
#define tsvalue(o)  (&rawtsvalue(o)->tsv)
#define rawuvalue(o)    check_exp(ttisuserdata(o), &(o)->value.gc->u)
#define uvalue(o)   (&rawuvalue(o)->uv)
#define clvalue(o)  check_exp(ttisfunction(o), &(o)->value.gc->cl)
#define hvalue(o)   check_exp(ttistable(o), &(o)->value.gc->h)
#define bvalue(o)   check_exp(ttisboolean(o), (o)->value.b)
#define thvalue(o)  check_exp(ttisthread(o), &(o)->value.gc->th)

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

/*
** for internal debug only
*/
#ifndef LUA_PACK_VALUE
#define checkconsistency(obj) \
  lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))

#define checkliveness(g,obj) \
  lua_assert(!iscollectable(obj) || \
  ((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
#else // #ifndef LUA_PACK_VALUE
#define checkconsistency(obj) \
  lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch._t.tt))

#define checkliveness(g,obj) \
  lua_assert(!iscollectable(obj) || \
  ((ttype(obj) == (obj)->value.gc->gch._t.tt) && !isdead(g, (obj)->value.gc)))
#endif // #ifndef LUA_PACK_VALUE

/* Macros to set values */
#ifndef LUA_PACK_VALUE
#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)

#define setnvalue(obj,x) \
  { lua_Number i_x = (x); TValue *i_o=(obj); i_o->value.n=i_x; i_o->tt=LUA_TNUMBER; }

#define setpvalue(obj,x) \
  { void *i_x = (x); TValue *i_o=(obj); i_o->value.p=i_x; i_o->tt=LUA_TLIGHTUSERDATA; }

#define setrvalue(obj,x) \
  { void *i_x = (x); TValue *i_o=(obj); i_o->value.p=i_x; i_o->tt=LUA_TROTABLE; }

#define setfvalue(obj,x) \
  { void *i_x = (x); TValue *i_o=(obj); i_o->value.p=i_x; i_o->tt=LUA_TLIGHTFUNCTION; }

#define setbvalue(obj,x) \
  { int i_x = (x); TValue *i_o=(obj); i_o->value.b=i_x; i_o->tt=LUA_TBOOLEAN; }

#define setsvalue(L,obj,x) \
  { GCObject *i_x = cast(GCObject *, (x)); \
    TValue *i_o=(obj); \
    i_o->value.gc=i_x; i_o->tt=LUA_TSTRING; \
    checkliveness(G(L),i_o); }

#define setuvalue(L,obj,x) \
  { GCObject *i_x = cast(GCObject *, (x)); \
    TValue *i_o=(obj); \
    i_o->value.gc=i_x; i_o->tt=LUA_TUSERDATA; \
    checkliveness(G(L),i_o); }

#define setthvalue(L,obj,x) \
  { GCObject *i_x = cast(GCObject *, (x)); \
    TValue *i_o=(obj); \
    i_o->value.gc=i_x; i_o->tt=LUA_TTHREAD; \
    checkliveness(G(L),i_o); }

#define setclvalue(L,obj,x) \
  { GCObject *i_x = cast(GCObject *, (x)); \
    TValue *i_o=(obj); \
    i_o->value.gc=i_x; i_o->tt=LUA_TFUNCTION; \
    checkliveness(G(L),i_o); }

#define sethvalue(L,obj,x) \
  { GCObject *i_x = cast(GCObject *, (x)); \
    TValue *i_o=(obj); \
    i_o->value.gc=i_x; i_o->tt=LUA_TTABLE; \
    checkliveness(G(L),i_o); }

#define setptvalue(L,obj,x) \
  { GCObject *i_x = cast(GCObject *, (x)); \
    TValue *i_o=(obj); \
    i_o->value.gc=i_x; i_o->tt=LUA_TPROTO; \
    checkliveness(G(L),i_o); }




#define setobj(L,obj1,obj2) \
  { const TValue *o2=(obj2); TValue *o1=(obj1); \
    o1->value = o2->value; o1->tt=o2->tt; \
    checkliveness(G(L),o1); }
#else // #ifndef LUA_PACK_VALUE
#define setnilvalue(obj) ( ttype_sig(obj) = add_sig(LUA_TNIL) )

#define setnvalue(obj,x) \
  { TValue *i_o=(obj); i_o->value.n=(x); }

#define setpvalue(obj,x) \
  { TValue *i_o=(obj); i_o->value.p=(x); i_o->_ts.tt_sig=add_sig(LUA_TLIGHTUSERDATA);}

#define setrvalue(obj,x) \
  { TValue *i_o=(obj); i_o->value.p=(x); i_o->_ts.tt_sig=add_sig(LUA_TROTABLE);}

#define setfvalue(obj,x) \
  { TValue *i_o=(obj); i_o->value.p=(x); i_o->_ts.tt_sig=add_sig(LUA_TLIGHTFUNCTION);}

#define setbvalue(obj,x) \
  { TValue *i_o=(obj); i_o->value.b=(x); i_o->_ts.tt_sig=add_sig(LUA_TBOOLEAN);}

#define setsvalue(L,obj,x) \
  { TValue *i_o=(obj); \
    i_o->value.gc=cast(GCObject *, (x)); i_o->_ts.tt_sig=add_sig(LUA_TSTRING); \
    checkliveness(G(L),i_o); }

#define setuvalue(L,obj,x) \
  { TValue *i_o=(obj); \
    i_o->value.gc=cast(GCObject *, (x)); i_o->_ts.tt_sig=add_sig(LUA_TUSERDATA); \
    checkliveness(G(L),i_o); }

#define setthvalue(L,obj,x) \
  { TValue *i_o=(obj); \
    i_o->value.gc=cast(GCObject *, (x)); i_o->_ts.tt_sig=add_sig(LUA_TTHREAD); \
    checkliveness(G(L),i_o); }

#define setclvalue(L,obj,x) \
  { TValue *i_o=(obj); \
    i_o->value.gc=cast(GCObject *, (x)); i_o->_ts.tt_sig=add_sig(LUA_TFUNCTION); \
    checkliveness(G(L),i_o); }

#define sethvalue(L,obj,x) \
  { TValue *i_o=(obj); \
    i_o->value.gc=cast(GCObject *, (x)); i_o->_ts.tt_sig=add_sig(LUA_TTABLE); \
    checkliveness(G(L),i_o); }

#define setptvalue(L,obj,x) \
  { TValue *i_o=(obj); \
    i_o->value.gc=cast(GCObject *, (x)); i_o->_ts.tt_sig=add_sig(LUA_TPROTO); \
    checkliveness(G(L),i_o); }




#define setobj(L,obj1,obj2) \
  { const TValue *o2=(obj2); TValue *o1=(obj1); \
    o1->value = o2->value; \
    checkliveness(G(L),o1); }
#endif // #ifndef LUA_PACK_VALUE

/*
** different types of sets, 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

#ifndef LUA_PACK_VALUE
#define setttype(obj, tt) (ttype(obj) = (tt))
#else // #ifndef LUA_PACK_VALUE
/* considering it used only in lgc to set LUA_TDEADKEY */
/* we could define it this way */
#define setttype(obj, _tt) ( ttype_sig(obj) = add_sig(_tt) )
#endif // #ifndef LUA_PACK_VALUE

#define iscollectable(o)    (ttype(o) >= LUA_TSTRING)



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


/*
** String headers for string table
*/
typedef union TString
{
    L_Umaxalign dummy;  /* ensures maximum alignment for strings */
    struct
    {
        CommonHeader;
        unsigned int hash;
        size_t len;
    } tsv;
} TString;


#define getstr(ts)  (((ts)->tsv.marked & READONLYMASK) ? cast(const char *, *(const char**)((ts) + 1)) : cast(const char *, (ts) + 1))
#define svalue(o)       getstr(rawtsvalue(o))



typedef union Udata
{
    L_Umaxalign dummy;  /* ensures maximum alignment for `local' udata */
    struct
    {
        CommonHeader;
        struct Table *metatable;
        struct Table *env;
        size_t len;
    } uv;
} Udata;




/*
** 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 */
    struct LocVar *locvars;  /* information about local variables */
    TString **upvalues;  /* upvalue names */
    TString  *source;
    int sizeupvalues;
    int sizek;  /* size of `k' */
    int sizecode;
    int sizelineinfo;
    int sizep;  /* size of `p' */
    int sizelocvars;
    int linedefined;
    int lastlinedefined;
    GCObject *gclist;
    lu_byte nups;  /* number of upvalues */
    lu_byte numparams;
    lu_byte is_vararg;
    lu_byte maxstacksize;
} Proto;


/* masks for new-style vararg */
#define VARARG_HASARG       1
#define VARARG_ISVARARG     2
#define VARARG_NEEDSARG     4


typedef struct LocVar
{
    TString *varname;
    int startpc;  /* first point where variable is active */
    int endpc;    /* first point where variable is dead */
} LocVar;



/*
** 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 isC; lu_byte nupvalues; GCObject *gclist; \
    struct Table *env

typedef struct CClosure
{
    ClosureHeader;
    lua_CFunction f;
    TValue upvalue[1];
} CClosure;


typedef struct LClosure
{
    ClosureHeader;
    struct Proto *p;
    UpVal *upvals[1];
} LClosure;


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


#define iscfunction(o)  ((ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)||(ttype(o)==LUA_TLIGHTFUNCTION))
#define isLfunction(o)  (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)


/*
** Tables
*/

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

#define LUA_TKEY_NIL {LUA_TVALUE_NIL, NULL}
#else // #ifndef LUA_PACK_VALUE
typedef struct TKey
{
    TValue tvk;
    struct
    {
        struct Node *next; /* for chaining */
    } nk;
} TKey;

#define LUA_TKEY_NIL {LUA_TVALUE_NIL}, {NULL}
#endif // #ifndef LUA_PACK_VALUE

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))


#define luaO_nilobject      (&luaO_nilobject_)

LUAI_DATA const TValue luaO_nilobject_;

#define ceillog2(x) (luaO_log2((x)-1) + 1)

LUAI_FUNC int luaO_log2(unsigned int x);
LUAI_FUNC int luaO_int2fb(unsigned int x);
LUAI_FUNC int luaO_fb2int(int x);
LUAI_FUNC int luaO_rawequalObj(const TValue *t1, const TValue *t2);
LUAI_FUNC int luaO_str2d(const char *s, lua_Number *result);
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