/
symbol.c
704 lines (621 loc) · 16.2 KB
/
symbol.c
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
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
/*
** symbol.c - Symbol class
**
** See Copyright Notice in mruby.h
*/
#include <string.h>
#include <mruby.h>
#include <mruby/khash.h>
#include <mruby/string.h>
#include <mruby/dump.h>
#include <mruby/class.h>
#include <mruby/internal.h>
#include <mruby/presym.h>
#ifndef MRB_NO_PRESYM
#ifndef MRB_PRESYM_SCANNING
/* const uint16_t presym_length_table[] */
/* const char * const presym_name_table[] */
# include <mruby/presym/table.h>
#endif
static mrb_sym
presym_find(const char *name, size_t len)
{
if (presym_length_table[MRB_PRESYM_MAX-1] < len) return 0;
mrb_sym start, idx, presym_size = MRB_PRESYM_MAX;
int cmp;
for (start = 0; presym_size != 0; presym_size/=2) {
idx = start+presym_size/2;
cmp = (int)len-(int)presym_length_table[idx];
if (cmp == 0) {
cmp = memcmp(name, presym_name_table[idx], len);
if (cmp == 0) return idx+1;
}
if (0 < cmp) {
start = ++idx;
--presym_size;
}
}
return 0;
}
static const char*
presym_sym2name(mrb_sym sym, mrb_int *lenp)
{
if (sym > MRB_PRESYM_MAX) return NULL;
if (lenp) *lenp = presym_length_table[sym-1];
return presym_name_table[sym-1];
}
#endif /* MRB_NO_PRESYM */
/* ------------------------------------------------------ */
static void
sym_validate_len(mrb_state *mrb, size_t len)
{
if (len >= UINT16_MAX) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "symbol length too long");
}
}
#ifdef MRB_USE_ALL_SYMBOLS
# define SYMBOL_INLINE_P(sym) FALSE
# define sym_inline_pack(name, len) 0
# define sym_inline_unpack(sym, buf, lenp) NULL
#else
# define SYMBOL_INLINE_P(sym) ((sym) >= (1<<24))
static const char pack_table[] = "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static mrb_sym
sym_inline_pack(const char *name, size_t len)
{
#if defined(MRB_WORD_BOXING) && defined(MRB_32BIT) && !defined(MRB_WORDBOX_NO_FLOAT_TRUNCATE)
const size_t pack_length_max = 4;
#else
const size_t pack_length_max = 5;
#endif
char c;
const char *p;
size_t i;
mrb_sym sym = 0;
if (len > pack_length_max) return 0; /* too long */
if (len == 0) return 0; /* empty string */
for (i=0; i<len; i++) {
uint32_t bits;
c = name[i];
if (c == 0) return 0; /* NUL in name */
p = strchr(pack_table, (int)c);
if (p == 0) return 0; /* non alnum char */
bits = (uint32_t)(p - pack_table)+1;
sym |= bits<<(24-i*6);
}
mrb_assert(SYMBOL_INLINE_P(sym));
return sym;
}
static const char*
sym_inline_unpack(mrb_sym sym, char *buf, mrb_int *lenp)
{
int i;
mrb_assert(SYMBOL_INLINE_P(sym));
for (i=0; i<5; i++) {
uint32_t bits = sym>>(24-i*6) & 0x3f;
if (bits == 0) break;
buf[i] = pack_table[bits-1];;
}
buf[i] = '\0';
if (lenp) *lenp = i;
return buf;
}
#endif
#define sym_lit_p(mrb, i) (mrb->symflags[i>>3]&(1<<(i&7)))
#define sym_lit_set(mrb, i) mrb->symflags[i>>3]|=(1<<(i&7))
#define sym_flags_clear(mrb, i) mrb->symflags[i>>3]&=~(1<<(i&7))
#define sym_len(mrb, i) (size_t)(sym_lit_p(mrb, i)?strlen(mrb->symtbl[i]):mrb_packed_int_decode(mrb->symtbl[i],NULL))
static mrb_bool
sym_check(mrb_state *mrb, const char *name, size_t len, mrb_sym i)
{
const char *symname = mrb->symtbl[i];
size_t symlen;
if (sym_lit_p(mrb, i)) {
symlen = strlen(symname);
}
else {
/* length in BER */
symlen = mrb_packed_int_decode((const uint8_t*)symname, (const uint8_t**)&symname);
}
if (len == symlen && memcmp(symname, name, len) == 0) {
return TRUE;
}
return FALSE;
}
static mrb_sym
find_symbol(mrb_state *mrb, const char *name, size_t len, uint8_t *hashp)
{
mrb_sym i;
uint8_t hash;
#ifndef MRB_NO_PRESYM
/* presym */
i = presym_find(name, len);
if (i > 0) return i;
#endif
/* inline symbol */
i = sym_inline_pack(name, len);
if (i > 0) return i;
hash = mrb_byte_hash((const uint8_t*)name, len);
if (hashp) *hashp = hash;
i = mrb->symhash[hash];
if (i == 0) return 0;
for (;;) {
if (sym_check(mrb, name, len, i)) {
return (i+MRB_PRESYM_MAX);
}
uint8_t diff = mrb->symlink[i];
if (diff == 0xff) {
i -= 0xff;
while (i > 0) {
if (sym_check(mrb, name, len, i)) {
return (i+MRB_PRESYM_MAX);
}
i--;
}
return 0;
}
if (diff == 0) return 0;
i -= diff;
}
return 0;
}
static mrb_sym
sym_intern(mrb_state *mrb, const char *name, size_t len, mrb_bool lit)
{
mrb_sym sym;
uint8_t hash;
sym_validate_len(mrb, len);
sym = find_symbol(mrb, name, len, &hash);
if (sym > 0) return sym;
/* registering a new symbol */
sym = mrb->symidx + 1;
if (mrb->symcapa <= sym) {
size_t symcapa = mrb->symcapa;
if (symcapa == 0) symcapa = 100;
else symcapa = (size_t)(symcapa * 6 / 5);
mrb->symtbl = (const char**)mrb_realloc(mrb, (void*)mrb->symtbl, sizeof(char*)*symcapa);
mrb->symflags = (uint8_t*)mrb_realloc(mrb, mrb->symflags, symcapa/8+1);
memset(mrb->symflags+mrb->symcapa/8+1, 0, (symcapa-mrb->symcapa)/8);
mrb->symlink = (uint8_t*)mrb_realloc(mrb, mrb->symlink, symcapa);
mrb->symcapa = symcapa;
}
sym_flags_clear(mrb, sym);
if ((lit || mrb_ro_data_p(name)) && strlen(name) == len) {
sym_lit_set(mrb, sym);
mrb->symtbl[sym] = name;
}
else {
uint32_t ulen = (uint32_t)len;
size_t ilen = mrb_packed_int_len(ulen);
char *p = (char *)mrb_malloc(mrb, len+ilen+1);
mrb_packed_int_encode(ulen, (uint8_t*)p, (uint8_t*)p+ilen);
memcpy(p+ilen, name, len);
p[ilen+len] = 0;
mrb->symtbl[sym] = p;
}
if (mrb->symhash[hash]) {
mrb_sym i = sym - mrb->symhash[hash];
if (i > 0xff)
mrb->symlink[sym] = 0xff;
else
mrb->symlink[sym] = i;
}
else {
mrb->symlink[sym] = 0;
}
mrb->symhash[hash] = mrb->symidx = sym;
return (sym+MRB_PRESYM_MAX);
}
MRB_API mrb_sym
mrb_intern(mrb_state *mrb, const char *name, size_t len)
{
return sym_intern(mrb, name, len, FALSE);
}
MRB_API mrb_sym
mrb_intern_static(mrb_state *mrb, const char *name, size_t len)
{
return sym_intern(mrb, name, len, TRUE);
}
MRB_API mrb_sym
mrb_intern_cstr(mrb_state *mrb, const char *name)
{
return mrb_intern(mrb, name, strlen(name));
}
MRB_API mrb_sym
mrb_intern_str(mrb_state *mrb, mrb_value str)
{
return mrb_intern(mrb, RSTRING_PTR(str), RSTRING_LEN(str));
}
MRB_API mrb_sym
mrb_intern_check(mrb_state *mrb, const char *name, size_t len)
{
mrb_sym sym;
sym_validate_len(mrb, len);
sym = find_symbol(mrb, name, len, NULL);
if (sym > 0) return sym;
return 0;
}
MRB_API mrb_value
mrb_check_intern(mrb_state *mrb, const char *name, size_t len)
{
mrb_sym sym = mrb_intern_check(mrb, name, len);
if (sym == 0) return mrb_nil_value();
return mrb_symbol_value(sym);
}
MRB_API mrb_sym
mrb_intern_check_cstr(mrb_state *mrb, const char *name)
{
return mrb_intern_check(mrb, name, strlen(name));
}
MRB_API mrb_value
mrb_check_intern_cstr(mrb_state *mrb, const char *name)
{
mrb_sym sym = mrb_intern_check_cstr(mrb, name);
if (sym == 0) return mrb_nil_value();
return mrb_symbol_value(sym);
}
MRB_API mrb_sym
mrb_intern_check_str(mrb_state *mrb, mrb_value str)
{
return mrb_intern_check(mrb, RSTRING_PTR(str), RSTRING_LEN(str));
}
MRB_API mrb_value
mrb_check_intern_str(mrb_state *mrb, mrb_value str)
{
mrb_sym sym = mrb_intern_check_str(mrb, str);
if (sym == 0) return mrb_nil_value();
return mrb_symbol_value(sym);
}
static const char*
sym2name_len(mrb_state *mrb, mrb_sym sym, char *buf, mrb_int *lenp)
{
if (sym == 0) goto outofsym;
if (SYMBOL_INLINE_P(sym)) return sym_inline_unpack(sym, buf, lenp);
#ifndef MRB_NO_PRESYM
{
const char *name = presym_sym2name(sym, lenp);
if (name) return name;
}
#endif
sym -= MRB_PRESYM_MAX;
if (mrb->symidx < sym) {
outofsym:
if (lenp) *lenp = 0;
return NULL;
}
const char *symname = mrb->symtbl[sym];
if (!sym_lit_p(mrb, sym)) {
uint32_t len = mrb_packed_int_decode((const uint8_t*)symname, (const uint8_t**)&symname);
if (lenp) *lenp = (mrb_int)len;
}
else if (lenp) {
*lenp = (mrb_int)strlen(symname);
}
return symname;
}
MRB_API const char*
mrb_sym_name_len(mrb_state *mrb, mrb_sym sym, mrb_int *lenp)
{
#ifdef MRB_USE_ALL_SYMBOLS
return sym2name_len(mrb, sym, NULL, lenp);
#else
return sym2name_len(mrb, sym, mrb->symbuf, lenp);
#endif
}
void
mrb_free_symtbl(mrb_state *mrb)
{
mrb_sym i, lim;
for (i=1, lim=mrb->symidx+1; i<lim; i++) {
if (!sym_lit_p(mrb, i)) {
mrb_free(mrb, (char*)mrb->symtbl[i]);
}
}
mrb_free(mrb, (void*)mrb->symtbl);
mrb_free(mrb, (void*)mrb->symlink);
mrb_free(mrb, (void*)mrb->symflags);
}
void
mrb_init_symtbl(mrb_state *mrb)
{
}
/**********************************************************************
* Document-class: Symbol
*
* <code>Symbol</code> objects represent names and some strings
* inside the Ruby
* interpreter. They are generated using the <code>:name</code> and
* <code>:"string"</code> literals
* syntax, and by the various <code>to_sym</code> methods. The same
* <code>Symbol</code> object will be created for a given name or string
* for the duration of a program's execution, regardless of the context
* or meaning of that name. Thus if <code>Fred</code> is a constant in
* one context, a method in another, and a class in a third, the
* <code>Symbol</code> <code>:Fred</code> will be the same object in
* all three contexts.
*
* module One
* class Fred
* end
* $f1 = :Fred
* end
* module Two
* Fred = 1
* $f2 = :Fred
* end
* def Fred()
* end
* $f3 = :Fred
* $f1.object_id #=> 2514190
* $f2.object_id #=> 2514190
* $f3.object_id #=> 2514190
*
*/
/* 15.2.11.3.2 */
/* 15.2.11.3.3 */
/*
* call-seq:
* sym.to_s -> string
*
* Returns the name or string corresponding to <i>sym</i>.
*
* :fred.to_s #=> "fred"
*/
static mrb_value
sym_to_s(mrb_state *mrb, mrb_value sym)
{
return mrb_sym_str(mrb, mrb_symbol(sym));
}
/*
* call-seq:
* sym.name -> string
*
* Returns the name or string corresponding to <i>sym</i>. Unlike #to_s, the
* returned string is frozen.
*
* :fred.name #=> "fred"
* :fred.name.frozen? #=> true
*/
static mrb_value
sym_name(mrb_state *mrb, mrb_value vsym)
{
mrb_sym sym = mrb_symbol(vsym);
mrb_int len;
const char *name = mrb_sym_name_len(mrb, sym, &len);
mrb_assert(name != NULL);
if (SYMBOL_INLINE_P(sym)) {
return mrb_str_new_frozen(mrb, name, len);
}
return mrb_str_new_static_frozen(mrb, name, len);
}
/* 15.2.11.3.4 */
/*
* call-seq:
* sym.to_sym -> sym
* sym.intern -> sym
*
* In general, <code>to_sym</code> returns the <code>Symbol</code> corresponding
* to an object. As <i>sym</i> is already a symbol, <code>self</code> is returned
* in this case.
*/
static mrb_value
sym_to_sym(mrb_state *mrb, mrb_value sym)
{
return sym;
}
/* 15.2.11.3.5(x) */
/*
* call-seq:
* sym.inspect -> string
*
* Returns the representation of <i>sym</i> as a symbol literal.
*
* :fred.inspect #=> ":fred"
*/
#if __STDC__
# define SIGN_EXTEND_CHAR(c) ((signed char)(c))
#else /* not __STDC__ */
/* As in Harbison and Steele. */
# define SIGN_EXTEND_CHAR(c) ((((unsigned char)(c)) ^ 128) - 128)
#endif
#define is_identchar(c) (SIGN_EXTEND_CHAR(c)!=-1&&(ISALNUM(c) || (c) == '_'))
static mrb_bool
is_special_global_name(const char* m)
{
switch (*m) {
case '~': case '*': case '$': case '?': case '!': case '@':
case '/': case '\\': case ';': case ',': case '.': case '=':
case ':': case '<': case '>': case '\"':
case '&': case '`': case '\'': case '+':
case '0':
++m;
break;
case '-':
++m;
if (is_identchar(*m)) m += 1;
break;
default:
if (!ISDIGIT(*m)) return FALSE;
do ++m; while (ISDIGIT(*m));
break;
}
return !*m;
}
static mrb_bool
symname_p(const char *name)
{
const char *m = name;
mrb_bool localid = FALSE;
if (!m) return FALSE;
switch (*m) {
case '\0':
return FALSE;
case '$':
if (is_special_global_name(++m)) return TRUE;
goto id;
case '@':
if (*++m == '@') ++m;
goto id;
case '<':
switch (*++m) {
case '<': ++m; break;
case '=': if (*++m == '>') ++m; break;
default: break;
}
break;
case '>':
switch (*++m) {
case '>': case '=': ++m; break;
default: break;
}
break;
case '=':
switch (*++m) {
case '~': ++m; break;
case '=': if (*++m == '=') ++m; break;
default: return FALSE;
}
break;
case '*':
if (*++m == '*') ++m;
break;
case '!':
switch (*++m) {
case '=': case '~': ++m;
}
break;
case '+': case '-':
if (*++m == '@') ++m;
break;
case '|':
if (*++m == '|') ++m;
break;
case '&':
if (*++m == '&') ++m;
break;
case '^': case '/': case '%': case '~': case '`':
++m;
break;
case '[':
if (*++m != ']') return FALSE;
if (*++m == '=') ++m;
break;
default:
localid = !ISUPPER(*m);
id:
if (*m != '_' && !ISALPHA(*m)) return FALSE;
while (is_identchar(*m)) m += 1;
if (localid) {
switch (*m) {
case '!': case '?': case '=': ++m;
default: break;
}
}
break;
}
return *m ? FALSE : TRUE;
}
static mrb_value
sym_inspect(mrb_state *mrb, mrb_value sym)
{
mrb_value str;
const char *name;
mrb_int len;
mrb_sym id = mrb_symbol(sym);
char *sp;
name = mrb_sym_name_len(mrb, id, &len);
str = mrb_str_new(mrb, NULL, len+1);
sp = RSTRING_PTR(str);
sp[0] = ':';
memcpy(sp+1, name, len);
mrb_assert_int_fit(mrb_int, len, size_t, SIZE_MAX);
if (!symname_p(name) || strlen(name) != (size_t)len) {
str = mrb_str_inspect(mrb, str);
sp = RSTRING_PTR(str);
sp[0] = ':';
sp[1] = '"';
}
#ifdef MRB_UTF8_STRING
if (SYMBOL_INLINE_P(id)) RSTR_SET_ASCII_FLAG(mrb_str_ptr(str));
#endif
return str;
}
MRB_API mrb_value
mrb_sym_str(mrb_state *mrb, mrb_sym sym)
{
mrb_int len;
const char *name = mrb_sym_name_len(mrb, sym, &len);
if (!name) return mrb_undef_value(); /* can't happen */
if (SYMBOL_INLINE_P(sym)) {
mrb_value str = mrb_str_new(mrb, name, len);
RSTR_SET_ASCII_FLAG(mrb_str_ptr(str));
return str;
}
return mrb_str_new_static(mrb, name, len);
}
static const char*
sym_cstr(mrb_state *mrb, mrb_sym sym, mrb_bool dump)
{
mrb_int len;
const char *name = mrb_sym_name_len(mrb, sym, &len);
if (!name) return NULL;
if (strlen(name) == (size_t)len && (!dump || symname_p(name))) {
return name;
}
else {
mrb_value str = mrb_str_new_static(mrb, name, len);
str = mrb_str_dump(mrb, str);
return RSTRING_PTR(str);
}
}
MRB_API const char*
mrb_sym_name(mrb_state *mrb, mrb_sym sym)
{
return sym_cstr(mrb, sym, FALSE);
}
MRB_API const char*
mrb_sym_dump(mrb_state *mrb, mrb_sym sym)
{
return sym_cstr(mrb, sym, TRUE);
}
#define lesser(a,b) (((a)>(b))?(b):(a))
static mrb_value
sym_cmp(mrb_state *mrb, mrb_value s1)
{
mrb_value s2 = mrb_get_arg1(mrb);
mrb_sym sym1, sym2;
if (!mrb_symbol_p(s2)) return mrb_nil_value();
sym1 = mrb_symbol(s1);
sym2 = mrb_symbol(s2);
if (sym1 == sym2) return mrb_fixnum_value(0);
else {
const char *p1, *p2;
int retval;
mrb_int len, len1, len2;
char buf1[8], buf2[8];
p1 = sym2name_len(mrb, sym1, buf1, &len1);
p2 = sym2name_len(mrb, sym2, buf2, &len2);
len = lesser(len1, len2);
retval = memcmp(p1, p2, len);
if (retval == 0) {
if (len1 == len2) return mrb_fixnum_value(0);
if (len1 > len2) return mrb_fixnum_value(1);
return mrb_fixnum_value(-1);
}
if (retval > 0) return mrb_fixnum_value(1);
return mrb_fixnum_value(-1);
}
}
void
mrb_init_symbol(mrb_state *mrb)
{
struct RClass *sym;
mrb->symbol_class = sym = mrb_define_class(mrb, "Symbol", mrb->object_class); /* 15.2.11 */
MRB_SET_INSTANCE_TT(sym, MRB_TT_SYMBOL);
mrb_undef_class_method(mrb, sym, "new");
mrb_define_method(mrb, sym, "to_s", sym_to_s, MRB_ARGS_NONE()); /* 15.2.11.3.3 */
mrb_define_method(mrb, sym, "name", sym_name, MRB_ARGS_NONE());
mrb_define_method(mrb, sym, "to_sym", sym_to_sym, MRB_ARGS_NONE()); /* 15.2.11.3.4 */
mrb_define_method(mrb, sym, "inspect", sym_inspect, MRB_ARGS_NONE()); /* 15.2.11.3.5(x) */
mrb_define_method(mrb, sym, "<=>", sym_cmp, MRB_ARGS_REQ(1));
}