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ba8b5c17 1/*
2** $Id: lobject.h,v 2.71 2012/09/11 18:21:44 roberto Exp $
3** Type definitions for Lua objects
4** See Copyright Notice in lua.h
5*/
6
7
8#ifndef lobject_h
9#define lobject_h
10
11
12#include <stdarg.h>
13
14
15#include "llimits.h"
16#include "lua.h"
17
18
19/*
20** Extra tags for non-values
21*/
22#define LUA_TPROTO LUA_NUMTAGS
23#define LUA_TUPVAL (LUA_NUMTAGS+1)
24#define LUA_TDEADKEY (LUA_NUMTAGS+2)
25
26/*
27** number of all possible tags (including LUA_TNONE but excluding DEADKEY)
28*/
29#define LUA_TOTALTAGS (LUA_TUPVAL+2)
30
31
32/*
33** tags for Tagged Values have the following use of bits:
34** bits 0-3: actual tag (a LUA_T* value)
35** bits 4-5: variant bits
36** bit 6: whether value is collectable
37*/
38
39#define VARBITS (3 << 4)
40
41
42/*
43** LUA_TFUNCTION variants:
44** 0 - Lua function
45** 1 - light C function
46** 2 - regular C function (closure)
47*/
48
49/* Variant tags for functions */
50#define LUA_TLCL (LUA_TFUNCTION | (0 << 4)) /* Lua closure */
51#define LUA_TLCF (LUA_TFUNCTION | (1 << 4)) /* light C function */
52#define LUA_TCCL (LUA_TFUNCTION | (2 << 4)) /* C closure */
53
54
55/* Variant tags for strings */
56#define LUA_TSHRSTR (LUA_TSTRING | (0 << 4)) /* short strings */
57#define LUA_TLNGSTR (LUA_TSTRING | (1 << 4)) /* long strings */
58
59
60/* Bit mark for collectable types */
61#define BIT_ISCOLLECTABLE (1 << 6)
62
63/* mark a tag as collectable */
64#define ctb(t) ((t) | BIT_ISCOLLECTABLE)
65
66
67/*
68** Union of all collectable objects
69*/
70typedef union GCObject GCObject;
71
72
73/*
74** Common Header for all collectable objects (in macro form, to be
75** included in other objects)
76*/
77#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
78
79
80/*
81** Common header in struct form
82*/
83typedef struct GCheader {
84 CommonHeader;
85} GCheader;
86
87
88
89/*
90** Union of all Lua values
91*/
92typedef union Value Value;
93
94
95#define numfield lua_Number n; /* numbers */
96
97
98
99/*
100** Tagged Values. This is the basic representation of values in Lua,
101** an actual value plus a tag with its type.
102*/
103
104#define TValuefields Value value_; int tt_
105
106typedef struct lua_TValue TValue;
107
108
109/* macro defining a nil value */
110#define NILCONSTANT {NULL}, LUA_TNIL
111
112
113#define val_(o) ((o)->value_)
114#define num_(o) (val_(o).n)
115
116
117/* raw type tag of a TValue */
118#define rttype(o) ((o)->tt_)
119
120/* tag with no variants (bits 0-3) */
121#define novariant(x) ((x) & 0x0F)
122
123/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
124#define ttype(o) (rttype(o) & 0x3F)
125
126/* type tag of a TValue with no variants (bits 0-3) */
127#define ttypenv(o) (novariant(rttype(o)))
128
129
130/* Macros to test type */
131#define checktag(o,t) (rttype(o) == (t))
132#define checktype(o,t) (ttypenv(o) == (t))
133#define ttisnumber(o) checktag((o), LUA_TNUMBER)
134#define ttisnil(o) checktag((o), LUA_TNIL)
135#define ttisboolean(o) checktag((o), LUA_TBOOLEAN)
136#define ttislightuserdata(o) checktag((o), LUA_TLIGHTUSERDATA)
137#define ttisstring(o) checktype((o), LUA_TSTRING)
138#define ttisshrstring(o) checktag((o), ctb(LUA_TSHRSTR))
139#define ttislngstring(o) checktag((o), ctb(LUA_TLNGSTR))
140#define ttistable(o) checktag((o), ctb(LUA_TTABLE))
141#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
142#define ttisclosure(o) ((rttype(o) & 0x1F) == LUA_TFUNCTION)
143#define ttisCclosure(o) checktag((o), ctb(LUA_TCCL))
144#define ttisLclosure(o) checktag((o), ctb(LUA_TLCL))
145#define ttislcf(o) checktag((o), LUA_TLCF)
146#define ttisuserdata(o) checktag((o), ctb(LUA_TUSERDATA))
147#define ttisthread(o) checktag((o), ctb(LUA_TTHREAD))
148#define ttisdeadkey(o) checktag((o), LUA_TDEADKEY)
149
150#define ttisequal(o1,o2) (rttype(o1) == rttype(o2))
151
152/* Macros to access values */
153#define nvalue(o) check_exp(ttisnumber(o), num_(o))
154#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc)
155#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p)
156#define rawtsvalue(o) check_exp(ttisstring(o), &val_(o).gc->ts)
157#define tsvalue(o) (&rawtsvalue(o)->tsv)
158#define rawuvalue(o) check_exp(ttisuserdata(o), &val_(o).gc->u)
159#define uvalue(o) (&rawuvalue(o)->uv)
160#define clvalue(o) check_exp(ttisclosure(o), &val_(o).gc->cl)
161#define clLvalue(o) check_exp(ttisLclosure(o), &val_(o).gc->cl.l)
162#define clCvalue(o) check_exp(ttisCclosure(o), &val_(o).gc->cl.c)
163#define fvalue(o) check_exp(ttislcf(o), val_(o).f)
164#define hvalue(o) check_exp(ttistable(o), &val_(o).gc->h)
165#define bvalue(o) check_exp(ttisboolean(o), val_(o).b)
166#define thvalue(o) check_exp(ttisthread(o), &val_(o).gc->th)
167/* a dead value may get the 'gc' field, but cannot access its contents */
168#define deadvalue(o) check_exp(ttisdeadkey(o), cast(void *, val_(o).gc))
169
170#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
171
172
173#define iscollectable(o) (rttype(o) & BIT_ISCOLLECTABLE)
174
175
176/* Macros for internal tests */
177#define righttt(obj) (ttype(obj) == gcvalue(obj)->gch.tt)
178
179#define checkliveness(g,obj) \
180 lua_longassert(!iscollectable(obj) || \
181 (righttt(obj) && !isdead(g,gcvalue(obj))))
182
183
184/* Macros to set values */
185#define settt_(o,t) ((o)->tt_=(t))
186
187#define setnvalue(obj,x) \
188 { TValue *io=(obj); num_(io)=(x); settt_(io, LUA_TNUMBER); }
189
190#define setnilvalue(obj) settt_(obj, LUA_TNIL)
191
192#define setfvalue(obj,x) \
193 { TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }
194
195#define setpvalue(obj,x) \
196 { TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
197
198#define setbvalue(obj,x) \
199 { TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
200
201#define setgcovalue(L,obj,x) \
202 { TValue *io=(obj); GCObject *i_g=(x); \
203 val_(io).gc=i_g; settt_(io, ctb(gch(i_g)->tt)); }
204
205#define setsvalue(L,obj,x) \
206 { TValue *io=(obj); \
207 TString *x_ = (x); \
208 val_(io).gc=cast(GCObject *, x_); settt_(io, ctb(x_->tsv.tt)); \
209 checkliveness(G(L),io); }
210
211#define setuvalue(L,obj,x) \
212 { TValue *io=(obj); \
213 val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TUSERDATA)); \
214 checkliveness(G(L),io); }
215
216#define setthvalue(L,obj,x) \
217 { TValue *io=(obj); \
218 val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTHREAD)); \
219 checkliveness(G(L),io); }
220
221#define setclLvalue(L,obj,x) \
222 { TValue *io=(obj); \
223 val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TLCL)); \
224 checkliveness(G(L),io); }
225
226#define setclCvalue(L,obj,x) \
227 { TValue *io=(obj); \
228 val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TCCL)); \
229 checkliveness(G(L),io); }
230
231#define sethvalue(L,obj,x) \
232 { TValue *io=(obj); \
233 val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTABLE)); \
234 checkliveness(G(L),io); }
235
236#define setdeadvalue(obj) settt_(obj, LUA_TDEADKEY)
237
238
239
240#define setobj(L,obj1,obj2) \
241 { const TValue *io2=(obj2); TValue *io1=(obj1); \
242 io1->value_ = io2->value_; io1->tt_ = io2->tt_; \
243 checkliveness(G(L),io1); }
244
245
246/*
247** different types of assignments, according to destination
248*/
249
250/* from stack to (same) stack */
251#define setobjs2s setobj
252/* to stack (not from same stack) */
253#define setobj2s setobj
254#define setsvalue2s setsvalue
255#define sethvalue2s sethvalue
256#define setptvalue2s setptvalue
257/* from table to same table */
258#define setobjt2t setobj
259/* to table */
260#define setobj2t setobj
261/* to new object */
262#define setobj2n setobj
263#define setsvalue2n setsvalue
264
265
266/* check whether a number is valid (useful only for NaN trick) */
267#define luai_checknum(L,o,c) { /* empty */ }
268
269
270/*
271** {======================================================
272** NaN Trick
273** =======================================================
274*/
275#if defined(LUA_NANTRICK)
276
277/*
278** numbers are represented in the 'd_' field. All other values have the
279** value (NNMARK | tag) in 'tt__'. A number with such pattern would be
280** a "signaled NaN", which is never generated by regular operations by
281** the CPU (nor by 'strtod')
282*/
283
284/* allows for external implementation for part of the trick */
285#if !defined(NNMARK) /* { */
286
287
288#if !defined(LUA_IEEEENDIAN)
289#error option 'LUA_NANTRICK' needs 'LUA_IEEEENDIAN'
290#endif
291
292
293#define NNMARK 0x7FF7A500
294#define NNMASK 0x7FFFFF00
295
296#undef TValuefields
297#undef NILCONSTANT
298
299#if (LUA_IEEEENDIAN == 0) /* { */
300
301/* little endian */
302#define TValuefields \
303 union { struct { Value v__; int tt__; } i; double d__; } u
304#define NILCONSTANT {{{NULL}, tag2tt(LUA_TNIL)}}
305/* field-access macros */
306#define v_(o) ((o)->u.i.v__)
307#define d_(o) ((o)->u.d__)
308#define tt_(o) ((o)->u.i.tt__)
309
310#else /* }{ */
311
312/* big endian */
313#define TValuefields \
314 union { struct { int tt__; Value v__; } i; double d__; } u
315#define NILCONSTANT {{tag2tt(LUA_TNIL), {NULL}}}
316/* field-access macros */
317#define v_(o) ((o)->u.i.v__)
318#define d_(o) ((o)->u.d__)
319#define tt_(o) ((o)->u.i.tt__)
320
321#endif /* } */
322
323#endif /* } */
324
325
326/* correspondence with standard representation */
327#undef val_
328#define val_(o) v_(o)
329#undef num_
330#define num_(o) d_(o)
331
332
333#undef numfield
334#define numfield /* no such field; numbers are the entire struct */
335
336/* basic check to distinguish numbers from non-numbers */
337#undef ttisnumber
338#define ttisnumber(o) ((tt_(o) & NNMASK) != NNMARK)
339
340#define tag2tt(t) (NNMARK | (t))
341
342#undef rttype
343#define rttype(o) (ttisnumber(o) ? LUA_TNUMBER : tt_(o) & 0xff)
344
345#undef settt_
346#define settt_(o,t) (tt_(o) = tag2tt(t))
347
348#undef setnvalue
349#define setnvalue(obj,x) \
350 { TValue *io_=(obj); num_(io_)=(x); lua_assert(ttisnumber(io_)); }
351
352#undef setobj
353#define setobj(L,obj1,obj2) \
354 { const TValue *o2_=(obj2); TValue *o1_=(obj1); \
355 o1_->u = o2_->u; \
356 checkliveness(G(L),o1_); }
357
358
359/*
360** these redefinitions are not mandatory, but these forms are more efficient
361*/
362
363#undef checktag
364#undef checktype
365#define checktag(o,t) (tt_(o) == tag2tt(t))
366#define checktype(o,t) (ctb(tt_(o) | VARBITS) == ctb(tag2tt(t) | VARBITS))
367
368#undef ttisequal
369#define ttisequal(o1,o2) \
370 (ttisnumber(o1) ? ttisnumber(o2) : (tt_(o1) == tt_(o2)))
371
372
373#undef luai_checknum
374#define luai_checknum(L,o,c) { if (!ttisnumber(o)) c; }
375
376#endif
377/* }====================================================== */
378
379
380
381/*
382** {======================================================
383** types and prototypes
384** =======================================================
385*/
386
387
388union Value {
389 GCObject *gc; /* collectable objects */
390 void *p; /* light userdata */
391 int b; /* booleans */
392 lua_CFunction f; /* light C functions */
393 numfield /* numbers */
394};
395
396
397struct lua_TValue {
398 TValuefields;
399};
400
401
402typedef TValue *StkId; /* index to stack elements */
403
404
405
406
407/*
408** Header for string value; string bytes follow the end of this structure
409*/
410typedef union TString {
411 L_Umaxalign dummy; /* ensures maximum alignment for strings */
412 struct {
413 CommonHeader;
414 lu_byte extra; /* reserved words for short strings; "has hash" for longs */
415 unsigned int hash;
416 size_t len; /* number of characters in string */
417 } tsv;
418} TString;
419
420
421/* get the actual string (array of bytes) from a TString */
422#define getstr(ts) cast(const char *, (ts) + 1)
423
424/* get the actual string (array of bytes) from a Lua value */
425#define svalue(o) getstr(rawtsvalue(o))
426
427
428/*
429** Header for userdata; memory area follows the end of this structure
430*/
431typedef union Udata {
432 L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
433 struct {
434 CommonHeader;
435 struct Table *metatable;
436 struct Table *env;
437 size_t len; /* number of bytes */
438 } uv;
439} Udata;
440
441
442
443/*
444** Description of an upvalue for function prototypes
445*/
446typedef struct Upvaldesc {
447 TString *name; /* upvalue name (for debug information) */
448 lu_byte instack; /* whether it is in stack */
449 lu_byte idx; /* index of upvalue (in stack or in outer function's list) */
450} Upvaldesc;
451
452
453/*
454** Description of a local variable for function prototypes
455** (used for debug information)
456*/
457typedef struct LocVar {
458 TString *varname;
459 int startpc; /* first point where variable is active */
460 int endpc; /* first point where variable is dead */
461} LocVar;
462
463
464/*
465** Function Prototypes
466*/
467typedef struct Proto {
468 CommonHeader;
469 TValue *k; /* constants used by the function */
470 Instruction *code;
471 struct Proto **p; /* functions defined inside the function */
472 int *lineinfo; /* map from opcodes to source lines (debug information) */
473 LocVar *locvars; /* information about local variables (debug information) */
474 Upvaldesc *upvalues; /* upvalue information */
475 union Closure *cache; /* last created closure with this prototype */
476 TString *source; /* used for debug information */
477 int sizeupvalues; /* size of 'upvalues' */
478 int sizek; /* size of `k' */
479 int sizecode;
480 int sizelineinfo;
481 int sizep; /* size of `p' */
482 int sizelocvars;
483 int linedefined;
484 int lastlinedefined;
485 GCObject *gclist;
486 lu_byte numparams; /* number of fixed parameters */
487 lu_byte is_vararg;
488 lu_byte maxstacksize; /* maximum stack used by this function */
489} Proto;
490
491
492
493/*
494** Lua Upvalues
495*/
496typedef struct UpVal {
497 CommonHeader;
498 TValue *v; /* points to stack or to its own value */
499 union {
500 TValue value; /* the value (when closed) */
501 struct { /* double linked list (when open) */
502 struct UpVal *prev;
503 struct UpVal *next;
504 } l;
505 } u;
506} UpVal;
507
508
509/*
510** Closures
511*/
512
513#define ClosureHeader \
514 CommonHeader; lu_byte nupvalues; GCObject *gclist
515
516typedef struct CClosure {
517 ClosureHeader;
518 lua_CFunction f;
519 TValue upvalue[1]; /* list of upvalues */
520} CClosure;
521
522
523typedef struct LClosure {
524 ClosureHeader;
525 struct Proto *p;
526 UpVal *upvals[1]; /* list of upvalues */
527} LClosure;
528
529
530typedef union Closure {
531 CClosure c;
532 LClosure l;
533} Closure;
534
535
536#define isLfunction(o) ttisLclosure(o)
537
538#define getproto(o) (clLvalue(o)->p)
539
540
541/*
542** Tables
543*/
544
545typedef union TKey {
546 struct {
547 TValuefields;
548 struct Node *next; /* for chaining */
549 } nk;
550 TValue tvk;
551} TKey;
552
553
554typedef struct Node {
555 TValue i_val;
556 TKey i_key;
557} Node;
558
559
560typedef struct Table {
561 CommonHeader;
562 lu_byte flags; /* 1<<p means tagmethod(p) is not present */
563 lu_byte lsizenode; /* log2 of size of `node' array */
564 struct Table *metatable;
565 TValue *array; /* array part */
566 Node *node;
567 Node *lastfree; /* any free position is before this position */
568 GCObject *gclist;
569 int sizearray; /* size of `array' array */
570} Table;
571
572
573
574/*
575** `module' operation for hashing (size is always a power of 2)
576*/
577#define lmod(s,size) \
578 (check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))
579
580
581#define twoto(x) (1<<(x))
582#define sizenode(t) (twoto((t)->lsizenode))
583
584
585/*
586** (address of) a fixed nil value
587*/
588#define luaO_nilobject (&luaO_nilobject_)
589
590
591LUAI_DDEC const TValue luaO_nilobject_;
592
593
594LUAI_FUNC int luaO_int2fb (unsigned int x);
595LUAI_FUNC int luaO_fb2int (int x);
596LUAI_FUNC int luaO_ceillog2 (unsigned int x);
597LUAI_FUNC lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2);
598LUAI_FUNC int luaO_str2d (const char *s, size_t len, lua_Number *result);
599LUAI_FUNC int luaO_hexavalue (int c);
600LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
601 va_list argp);
602LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
603LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len);
604
605
606#endif
607
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