lua/lobject.h

202 lines
4.6 KiB
C

/*
** $Id: lobject.h,v 1.73 2000/08/21 14:34:43 roberto Exp roberto $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
#ifndef lobject_h
#define lobject_h
#include "llimits.h"
#include "lua.h"
#ifdef DEBUG
#undef NDEBUG
#include <assert.h>
#define LUA_INTERNALERROR(s) assert(((void)s,0))
#define LUA_ASSERT(c,s) assert(((void)s,(c)))
#else
#define LUA_INTERNALERROR(s) /* empty */
#define LUA_ASSERT(c,s) /* empty */
#endif
#ifdef DEBUG
/* to avoid warnings, and make sure value is really unused */
#define UNUSED(x) (x=0, (void)(x))
#else
#define UNUSED(x) ((void)(x)) /* to avoid warnings */
#endif
/*
** Lua TYPES
** WARNING: if you change the order of this enumeration,
** grep "ORDER LUA_T"
*/
typedef enum {
TAG_USERDATA = 0, /* default tag for userdata */
TAG_NUMBER, /* fixed tag for numbers */
TAG_STRING, /* fixed tag for strings */
TAG_TABLE, /* default tag for tables */
TAG_LCLOSURE, /* fixed tag for Lua closures */
TAG_CCLOSURE, /* fixed tag for C closures */
TAG_NIL, /* last "pre-defined" tag */
TAG_LMARK, /* mark for Lua closures */
TAG_CMARK /* mark for C closures */
} lua_Type;
/* tags for values visible from Lua == first user-created tag */
#define NUM_TAGS 7
/*
** check whether `t' is a mark
*/
#define is_T_MARK(t) ((t) == TAG_LMARK || (t) == TAG_CMARK)
typedef union {
struct TString *ts; /* TAG_STRING, TAG_USERDATA */
struct Closure *cl; /* TAG_[CL]CLOSURE, TAG_CMARK */
struct Hash *a; /* TAG_TABLE */
struct CallInfo *i; /* TAG_LMARK */
Number n; /* TAG_NUMBER */
} Value;
/* Macros to access values */
#define ttype(o) ((o)->ttype)
#define nvalue(o) ((o)->value.n)
#define tsvalue(o) ((o)->value.ts)
#define clvalue(o) ((o)->value.cl)
#define hvalue(o) ((o)->value.a)
#define infovalue(o) ((o)->value.i)
#define svalue(o) (tsvalue(o)->str)
typedef struct lua_TObject {
lua_Type ttype;
Value value;
} TObject;
/*
** String headers for string table
*/
typedef struct TString {
union {
struct { /* for strings */
unsigned long hash;
size_t len;
int constindex; /* hint to reuse constants */
} s;
struct { /* for userdata */
int tag;
void *value;
} d;
} u;
struct TString *nexthash; /* chain for hash table */
unsigned char marked;
char str[1]; /* variable length string!! must be the last field! */
} TString;
/*
** Function Prototypes
*/
typedef struct Proto {
Number *knum; /* Number numbers used by the function */
int nknum; /* size of `knum' */
struct TString **kstr; /* strings used by the function */
int nkstr; /* size of `kstr' */
struct Proto **kproto; /* functions defined inside the function */
int nkproto; /* size of `kproto' */
Instruction *code; /* ends with opcode ENDCODE */
int numparams;
int is_vararg;
int maxstacksize;
struct Proto *next;
int marked;
/* debug information */
int *lineinfo; /* map from opcodes to source lines */
int nlocvars;
struct LocVar *locvars; /* information about local variables */
int lineDefined;
TString *source;
} Proto;
typedef struct LocVar {
TString *varname;
int startpc; /* first point where variable is active */
int endpc; /* first point where variable is dead */
} LocVar;
/*
** Closures
*/
typedef struct Closure {
union {
lua_CFunction c; /* C functions */
struct Proto *l; /* Lua functions */
} f;
struct Closure *next;
struct Closure *mark; /* marked closures (point to itself when not marked) */
int nupvalues;
TObject upvalue[1];
} Closure;
typedef struct Node {
TObject key;
TObject val;
struct Node *next; /* for chaining */
} Node;
typedef struct Hash {
Node *node;
int htag;
int size;
Node *firstfree; /* this position is free; all positions after it are full */
struct Hash *next;
struct Hash *mark; /* marked tables (point to itself when not marked) */
} Hash;
/* unmarked tables and closures are represented by pointing `mark' to
** themselves
*/
#define ismarked(x) ((x)->mark != (x))
/*
** informations about a call (for debugging)
*/
typedef struct CallInfo {
struct Closure *func; /* function being called */
const Instruction **pc; /* current pc of called function */
int lastpc; /* last pc traced */
int line; /* current line */
int refi; /* current index in `lineinfo' */
} CallInfo;
extern const char *const luaO_typenames[];
extern const TObject luaO_nilobject;
#define luaO_typename(o) luaO_typenames[ttype(o)]
lint32 luaO_power2 (lint32 n);
int luaO_equalObj (const TObject *t1, const TObject *t2);
int luaO_str2d (const char *s, Number *result);
#endif