aboutsummaryrefslogtreecommitdiff
blob: f1e447ef3ba82afd009d786e3e77a97e7da465e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
/*
** $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)


/*
** 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
*/
typedef union {
  GCObject *gc;
  void *p;
  lua_Number n;
  int b;
} Value;


/*
** Tagged Values
*/

#define TValuefields	Value value; int tt

typedef struct lua_TValue {
  TValuefields;
} TValue;


/* Macros to test type */
#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)

/* Macros to access values */
#define ttype(o)	((o)->tt)
#define gcvalue(o)	check_exp(iscollectable(o), (o)->value.gc)
#define pvalue(o)	check_exp(ttislightuserdata(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
*/
#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)))


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

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

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

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

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


/*
** 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

#define setttype(obj, tt) (ttype(obj) = (tt))


#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;
    lu_byte reserved;
    unsigned int hash;
    size_t len;
  } tsv;
} TString;


#define getstr(ts)	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)
#define isLfunction(o)	(ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)


/*
** 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))


#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