lua/lobject.h

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/*
** $Id: lobject.h,v 1.132 2002/05/15 18:57:44 roberto Exp roberto $
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** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
#ifndef lobject_h
#define lobject_h
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#include "llimits.h"
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#include "lua.h"
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/* tags for values visible from Lua */
#define NUM_TAGS LUA_TFUNCTION
typedef union {
void *p;
union TString *ts;
union Udata *u;
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union Closure *cl;
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struct Table *h;
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lua_Number n;
int b;
} Value;
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typedef struct lua_TObject {
int tt;
Value value;
} TObject;
/* Macros to access values */
#define ttype(o) ((o)->tt)
#define pvalue(o) ((o)->value.p)
#define nvalue(o) ((o)->value.n)
#define tsvalue(o) ((o)->value.ts)
#define uvalue(o) ((o)->value.u)
#define clvalue(o) ((o)->value.cl)
#define hvalue(o) ((o)->value.h)
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#define bvalue(o) ((o)->value.b)
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#define l_isfalse(o) (ttype(o) == LUA_TNIL || \
(ttype(o) == LUA_TBOOLEAN && bvalue(o) == 0))
/* Macros to set values */
#define setnvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TNUMBER; i_o->value.n=(x); }
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#define chgnvalue(obj,x) ((obj)->value.n=(x))
#define setpvalue(obj,x) \
{ TObject *i_o=(obj); i_o->tt=LUA_TUDATAVAL; i_o->value.p=(x); }
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#define setbvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TBOOLEAN; i_o->value.b=(x); }
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#define setsvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TSTRING; i_o->value.ts=(x); }
#define setuvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TUSERDATA; i_o->value.u=(x); }
#define setclvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TFUNCTION; i_o->value.cl=(x); }
#define sethvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TTABLE; i_o->value.h=(x); }
#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
#define setobj(obj1,obj2) \
{ TObject *o1=(obj1); const TObject *o2=(obj2); \
o1->tt=o2->tt; o1->value = o2->value; }
#define setttype(obj, tt) (ttype(obj) = (tt))
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typedef TObject *StkId; /* index to stack elements */
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/*
** String headers for string table
*/
typedef union TString {
union L_Umaxalign dummy; /* ensures maximum alignment for strings */
struct {
lu_hash hash;
size_t len;
int marked;
union TString *nexthash; /* chain for hash table */
} tsv;
} TString;
#define getstr(ts) cast(const char *, (ts) + 1)
#define svalue(o) getstr(tsvalue(o))
typedef union Udata {
union L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
struct {
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struct Table *metatable;
union Udata *next; /* chain for list of all udata */
size_t len; /* least 2 bits reserved for gc mark */
} uv;
} Udata;
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/*
** Function Prototypes
*/
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typedef struct Proto {
TObject *k; /* constants used by the function */
Instruction *code;
struct Proto **p; /* functions defined inside the function */
struct Proto *next;
int *lineinfo; /* map from opcodes to source lines */
struct LocVar *locvars; /* information about local variables */
TString *source;
int sizek; /* size of `k' */
int sizecode;
int sizep; /* size of `p' */
int sizelocvars;
int lineDefined;
lu_byte nupvalues;
lu_byte numparams;
lu_byte is_vararg;
lu_byte maxstacksize;
lu_byte marked;
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} Proto;
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typedef struct LocVar {
TString *varname;
int startpc; /* first point where variable is active */
int endpc; /* first point where variable is dead */
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} LocVar;
/*
** Upvalues
*/
typedef struct UpVal {
TObject *v; /* points to stack or to its own value */
struct UpVal *next;
TObject value; /* the value (when closed) */
} UpVal;
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/*
** Closures
*/
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typedef struct CClosure {
lu_byte isC; /* 0 for Lua functions, 1 for C functions */
lu_byte nupvalues;
lu_byte marked;
union Closure *next;
lua_CFunction f;
TObject upvalue[1];
} CClosure;
typedef struct LClosure {
lu_byte isC;
lu_byte nupvalues;
lu_byte marked;
union Closure *next; /* first four fields must be equal to CClosure!! */
struct Proto *p;
UpVal *upvals[1];
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} LClosure;
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typedef union Closure {
CClosure c;
LClosure l;
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} Closure;
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#define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
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/*
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** Tables
*/
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typedef struct Node {
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TObject i_key;
TObject i_val;
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struct Node *next; /* for chaining */
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} Node;
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typedef struct Table {
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struct Table *metatable;
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TObject *array; /* array part */
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Node *node;
Node *firstfree; /* this position is free; all positions after it are full */
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struct Table *next;
struct Table *mark; /* marked tables (point to itself when not marked) */
int sizearray; /* size of `array' array */
unsigned short flags; /* 1<<p means tagmethod(p) is not present */
lu_byte lsizenode; /* log2 of size of `node' array */
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} Table;
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/* unmarked tables are represented by pointing `mark' to themselves */
#define ismarked(x) ((x)->mark != (x))
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/*
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** `module' operation for hashing (size is always a power of 2)
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*/
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#define lmod(s,size) (cast(int, (s) & ((size)-1)))
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#define twoto(x) (1<<(x))
#define sizenode(t) (twoto((t)->lsizenode))
#define sizearray(t) ((t)->sizearray)
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/*
** masks for comparison results
*/
#define CMP_EQ 1
#define CMP_LT 2
#define CMP_GT 4
#define CMP_N 8 /* not comparable values (e.g. NaN) */
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extern const TObject luaO_nilobject;
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int luaO_log2 (unsigned int x);
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#define luaO_openspace(L,n,t) cast(t *, luaO_openspaceaux(L,(n)*sizeof(t)))
void *luaO_openspaceaux (lua_State *L, size_t n);
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int luaO_equalObj (const TObject *t1, const TObject *t2);
int luaO_str2d (const char *s, lua_Number *result);
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const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp);
const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
void luaO_chunkid (char *out, const char *source, int len);
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#endif