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/*
** $Id: lobject.h,v 1.20 1998/06/11 18:21:37 roberto Exp roberto $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
#ifndef lobject_h
#define lobject_h
#include <limits.h>
#include "lua.h"
#ifdef DEBUG
#include "lauxlib.h"
#define LUA_INTERNALERROR(s) \
luaL_verror("INTERNAL ERROR - %s [%s:%d]",(s),__FILE__,__LINE__)
#define LUA_ASSERT(c,s) { if (!(c)) LUA_INTERNALERROR(s); }
#else
#define LUA_INTERNALERROR(s) /* empty */
#define LUA_ASSERT(c,s) /* empty */
#endif
/*
** "real" is the type "number" of Lua
** GREP LUA_NUMBER to change that
*/
#ifndef LUA_NUM_TYPE
#define LUA_NUM_TYPE double
#endif
/*
** format to convert number to strings
*/
#define NUMBER_FMT "%g"
typedef LUA_NUM_TYPE real;
#define Byte lua_Byte /* some systems have Byte as a predefined type */
typedef unsigned char Byte; /* unsigned 8 bits */
#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
/* maximum value of a word of 2 bytes (-2 for safety); must fit in an "int" */
#if MAX_INT < 65534
#define MAX_WORD MAX_INT
#else
#define MAX_WORD 65534
#endif
typedef unsigned int IntPoint; /* unsigned with same size as a pointer (for hashing) */
/*
** Lua TYPES
** WARNING: if you change the order of this enumeration,
** grep "ORDER LUA_T"
*/
typedef enum {
LUA_T_USERDATA = 0, /* tag default for userdata */
LUA_T_NUMBER = -1, /* fixed tag for numbers */
LUA_T_STRING = -2, /* fixed tag for strings */
LUA_T_ARRAY = -3, /* tag default for tables (or arrays) */
LUA_T_PROTO = -4, /* fixed tag for functions */
LUA_T_CPROTO = -5, /* fixed tag for Cfunctions */
LUA_T_NIL = -6, /* last "pre-defined" tag */
LUA_T_CLOSURE = -7,
LUA_T_CLMARK = -8, /* mark for closures */
LUA_T_PMARK = -9, /* mark for Lua prototypes */
LUA_T_CMARK = -10, /* mark for C prototypes */
LUA_T_LINE = -11
} lua_Type;
#define NUM_TYPES 11
#define NUM_TAGS 7
typedef union {
lua_CFunction f; /* LUA_T_CPROTO, LUA_T_CMARK */
real n; /* LUA_T_NUMBER */
struct TaggedString *ts; /* LUA_T_STRING, LUA_T_USERDATA */
struct TProtoFunc *tf; /* LUA_T_PROTO, LUA_T_PMARK */
struct Closure *cl; /* LUA_T_CLOSURE, LUA_T_CLMARK */
struct Hash *a; /* LUA_T_ARRAY */
int i; /* LUA_T_LINE */
} Value;
typedef struct TObject {
lua_Type ttype;
Value value;
} TObject;
/*
** generic header for garbage collector lists
*/
typedef struct GCnode {
struct GCnode *next;
int marked;
} GCnode;
/*
** String headers for string table
*/
typedef struct TaggedString {
GCnode head;
unsigned long hash;
int constindex; /* hint to reuse constants (= -1 if this is a userdata) */
union {
struct {
TObject globalval;
long len; /* if this is a string, here is its length */
} s;
struct {
int tag;
void *v; /* if this is a userdata, here is its value */
} d;
} u;
char str[1]; /* \0 byte already reserved */
} TaggedString;
/*
** Function Prototypes
*/
typedef struct TProtoFunc {
GCnode head;
struct TObject *consts;
int nconsts;
Byte *code; /* ends with opcode ENDCODE */
int lineDefined;
TaggedString *fileName;
struct LocVar *locvars; /* ends with line = -1 */
} TProtoFunc;
typedef struct LocVar {
TaggedString *varname; /* NULL signals end of scope */
int line;
} LocVar;
/* Macros to access structure members */
#define ttype(o) ((o)->ttype)
#define nvalue(o) ((o)->value.n)
#define svalue(o) ((o)->value.ts->str)
#define tsvalue(o) ((o)->value.ts)
#define clvalue(o) ((o)->value.cl)
#define avalue(o) ((o)->value.a)
#define fvalue(o) ((o)->value.f)
#define tfvalue(o) ((o)->value.tf)
#define protovalue(o) ((o)->value.cl->consts)
/*
** Closures
*/
typedef struct Closure {
GCnode head;
int nelems; /* not included the first one (always the prototype) */
TObject consts[1]; /* at least one for prototype */
} Closure;
typedef struct node {
TObject ref;
TObject val;
} Node;
typedef struct Hash {
GCnode head;
Node *node;
int nhash;
int nuse;
int htag;
} Hash;
extern char *luaO_typenames[];
extern TObject luaO_nilobject;
int luaO_equalObj (TObject *t1, TObject *t2);
int luaO_redimension (int oldsize);
void luaO_insertlist (GCnode *root, GCnode *node);
#ifdef OLD_ANSI
void luaO_memup (void *dest, void *src, int size);
void luaO_memdown (void *dest, void *src, int size);
#else
#include <string.h>
#define luaO_memup(d,s,n) memmove(d,s,n)
#define luaO_memdown(d,s,n) memmove(d,s,n)
#endif
#endif
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