forked from beberlei/php-src
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathzend_opcode.c
1118 lines (1008 loc) · 33.4 KB
/
zend_opcode.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
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
#include <stdio.h>
#include "zend.h"
#include "zend_alloc.h"
#include "zend_compile.h"
#include "zend_extensions.h"
#include "zend_API.h"
#include "zend_sort.h"
#include "zend_vm.h"
static void zend_extension_op_array_ctor_handler(zend_extension *extension, zend_op_array *op_array)
{
if (extension->op_array_ctor) {
extension->op_array_ctor(op_array);
}
}
static void zend_extension_op_array_dtor_handler(zend_extension *extension, zend_op_array *op_array)
{
if (extension->op_array_dtor) {
extension->op_array_dtor(op_array);
}
}
void init_op_array(zend_op_array *op_array, zend_uchar type, int initial_ops_size)
{
op_array->type = type;
op_array->arg_flags[0] = 0;
op_array->arg_flags[1] = 0;
op_array->arg_flags[2] = 0;
op_array->refcount = (uint32_t *) emalloc(sizeof(uint32_t));
*op_array->refcount = 1;
op_array->last = 0;
op_array->opcodes = emalloc(initial_ops_size * sizeof(zend_op));
op_array->last_var = 0;
op_array->vars = NULL;
op_array->T = 0;
op_array->function_name = NULL;
op_array->filename = zend_get_compiled_filename();
op_array->doc_comment = NULL;
op_array->arg_info = NULL;
op_array->num_args = 0;
op_array->required_num_args = 0;
op_array->scope = NULL;
op_array->prototype = NULL;
op_array->live_range = NULL;
op_array->try_catch_array = NULL;
op_array->last_live_range = 0;
op_array->static_variables = NULL;
ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, &op_array->static_variables);
op_array->last_try_catch = 0;
op_array->fn_flags = 0;
op_array->last_literal = 0;
op_array->literals = NULL;
ZEND_MAP_PTR_INIT(op_array->run_time_cache, NULL);
op_array->cache_size = zend_op_array_extension_handles * sizeof(void*);
memset(op_array->reserved, 0, ZEND_MAX_RESERVED_RESOURCES * sizeof(void*));
if (zend_extension_flags & ZEND_EXTENSIONS_HAVE_OP_ARRAY_CTOR) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_ctor_handler, op_array);
}
}
ZEND_API void destroy_zend_function(zend_function *function)
{
zval tmp;
ZVAL_PTR(&tmp, function);
zend_function_dtor(&tmp);
}
ZEND_API void zend_type_release(zend_type type, zend_bool persistent) {
if (ZEND_TYPE_HAS_LIST(type)) {
zend_type *list_type;
ZEND_TYPE_LIST_FOREACH(ZEND_TYPE_LIST(type), list_type) {
if (ZEND_TYPE_HAS_NAME(*list_type)) {
zend_string_release(ZEND_TYPE_NAME(*list_type));
}
} ZEND_TYPE_LIST_FOREACH_END();
if (!ZEND_TYPE_USES_ARENA(type)) {
pefree(ZEND_TYPE_LIST(type), persistent);
}
} else if (ZEND_TYPE_HAS_NAME(type)) {
zend_string_release(ZEND_TYPE_NAME(type));
}
}
void zend_free_internal_arg_info(zend_internal_function *function) {
if ((function->fn_flags & (ZEND_ACC_HAS_RETURN_TYPE|ZEND_ACC_HAS_TYPE_HINTS)) &&
function->arg_info) {
uint32_t i;
uint32_t num_args = function->num_args + 1;
zend_internal_arg_info *arg_info = function->arg_info - 1;
if (function->fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
for (i = 0 ; i < num_args; i++) {
zend_type_release(arg_info[i].type, /* persistent */ 1);
}
free(arg_info);
}
}
ZEND_API void zend_function_dtor(zval *zv)
{
zend_function *function = Z_PTR_P(zv);
if (function->type == ZEND_USER_FUNCTION) {
ZEND_ASSERT(function->common.function_name);
destroy_op_array(&function->op_array);
/* op_arrays are allocated on arena, so we don't have to free them */
} else {
ZEND_ASSERT(function->type == ZEND_INTERNAL_FUNCTION);
ZEND_ASSERT(function->common.function_name);
zend_string_release_ex(function->common.function_name, 1);
/* For methods this will be called explicitly. */
if (!function->common.scope) {
zend_free_internal_arg_info(&function->internal_function);
}
if (!(function->common.fn_flags & ZEND_ACC_ARENA_ALLOCATED)) {
pefree(function, 1);
}
}
}
ZEND_API void zend_cleanup_internal_class_data(zend_class_entry *ce)
{
if (CE_STATIC_MEMBERS(ce)) {
zval *static_members = CE_STATIC_MEMBERS(ce);
zval *p = static_members;
zval *end = p + ce->default_static_members_count;
if (UNEXPECTED(ZEND_MAP_PTR(ce->static_members_table) == &ce->default_static_members_table)) {
/* Special case: If this is a static property on a dl'ed internal class, then the
* static property table and the default property table are the same. In this case we
* destroy the values here, but leave behind valid UNDEF zvals and don't free the
* table itself. */
while (p != end) {
if (UNEXPECTED(Z_ISREF_P(p))) {
zend_property_info *prop_info;
ZEND_REF_FOREACH_TYPE_SOURCES(Z_REF_P(p), prop_info) {
if (prop_info->ce == ce && p - static_members == prop_info->offset) {
ZEND_REF_DEL_TYPE_SOURCE(Z_REF_P(p), prop_info);
break; /* stop iteration here, the array might be realloc()'ed */
}
} ZEND_REF_FOREACH_TYPE_SOURCES_END();
}
i_zval_ptr_dtor(p);
ZVAL_UNDEF(p);
p++;
}
} else {
ZEND_MAP_PTR_SET(ce->static_members_table, NULL);
while (p != end) {
if (UNEXPECTED(Z_ISREF_P(p))) {
zend_property_info *prop_info;
ZEND_REF_FOREACH_TYPE_SOURCES(Z_REF_P(p), prop_info) {
if (prop_info->ce == ce && p - static_members == prop_info->offset) {
ZEND_REF_DEL_TYPE_SOURCE(Z_REF_P(p), prop_info);
break; /* stop iteration here, the array might be realloc()'ed */
}
} ZEND_REF_FOREACH_TYPE_SOURCES_END();
}
i_zval_ptr_dtor(p);
p++;
}
efree(static_members);
}
}
}
static void _destroy_zend_class_traits_info(zend_class_entry *ce)
{
uint32_t i;
for (i = 0; i < ce->num_traits; i++) {
zend_string_release_ex(ce->trait_names[i].name, 0);
zend_string_release_ex(ce->trait_names[i].lc_name, 0);
}
efree(ce->trait_names);
if (ce->trait_aliases) {
i = 0;
while (ce->trait_aliases[i]) {
if (ce->trait_aliases[i]->trait_method.method_name) {
zend_string_release_ex(ce->trait_aliases[i]->trait_method.method_name, 0);
}
if (ce->trait_aliases[i]->trait_method.class_name) {
zend_string_release_ex(ce->trait_aliases[i]->trait_method.class_name, 0);
}
if (ce->trait_aliases[i]->alias) {
zend_string_release_ex(ce->trait_aliases[i]->alias, 0);
}
efree(ce->trait_aliases[i]);
i++;
}
efree(ce->trait_aliases);
}
if (ce->trait_precedences) {
uint32_t j;
i = 0;
while (ce->trait_precedences[i]) {
zend_string_release_ex(ce->trait_precedences[i]->trait_method.method_name, 0);
zend_string_release_ex(ce->trait_precedences[i]->trait_method.class_name, 0);
for (j = 0; j < ce->trait_precedences[i]->num_excludes; j++) {
zend_string_release_ex(ce->trait_precedences[i]->exclude_class_names[j], 0);
}
efree(ce->trait_precedences[i]);
i++;
}
efree(ce->trait_precedences);
}
}
ZEND_API void destroy_zend_class(zval *zv)
{
zend_property_info *prop_info;
zend_class_entry *ce = Z_PTR_P(zv);
zend_function *fn;
if (ce->ce_flags & (ZEND_ACC_IMMUTABLE|ZEND_ACC_PRELOADED)) {
zend_op_array *op_array;
if (ce->default_static_members_count) {
zend_cleanup_internal_class_data(ce);
}
if (ce->ce_flags & ZEND_HAS_STATIC_IN_METHODS) {
ZEND_HASH_FOREACH_PTR(&ce->function_table, op_array) {
if (op_array->type == ZEND_USER_FUNCTION) {
destroy_op_array(op_array);
}
} ZEND_HASH_FOREACH_END();
}
return;
} else if (--ce->refcount > 0) {
return;
}
switch (ce->type) {
case ZEND_USER_CLASS:
if (ce->parent_name && !(ce->ce_flags & ZEND_ACC_RESOLVED_PARENT)) {
zend_string_release_ex(ce->parent_name, 0);
}
if (ce->default_properties_table) {
zval *p = ce->default_properties_table;
zval *end = p + ce->default_properties_count;
while (p != end) {
i_zval_ptr_dtor(p);
p++;
}
efree(ce->default_properties_table);
}
if (ce->default_static_members_table) {
zval *p = ce->default_static_members_table;
zval *end = p + ce->default_static_members_count;
while (p != end) {
if (UNEXPECTED(Z_ISREF_P(p))) {
zend_property_info *prop_info;
ZEND_REF_FOREACH_TYPE_SOURCES(Z_REF_P(p), prop_info) {
if (prop_info->ce == ce && p - ce->default_static_members_table == prop_info->offset) {
ZEND_REF_DEL_TYPE_SOURCE(Z_REF_P(p), prop_info);
break; /* stop iteration here, the array might be realloc()'ed */
}
} ZEND_REF_FOREACH_TYPE_SOURCES_END();
}
i_zval_ptr_dtor(p);
p++;
}
efree(ce->default_static_members_table);
}
ZEND_HASH_FOREACH_PTR(&ce->properties_info, prop_info) {
if (prop_info->ce == ce) {
zend_string_release_ex(prop_info->name, 0);
if (prop_info->doc_comment) {
zend_string_release_ex(prop_info->doc_comment, 0);
}
zend_type_release(prop_info->type, /* persistent */ 0);
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->properties_info);
zend_string_release_ex(ce->name, 0);
zend_hash_destroy(&ce->function_table);
if (zend_hash_num_elements(&ce->constants_table)) {
zend_class_constant *c;
ZEND_HASH_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce) {
zval_ptr_dtor_nogc(&c->value);
if (c->doc_comment) {
zend_string_release_ex(c->doc_comment, 0);
}
}
} ZEND_HASH_FOREACH_END();
}
zend_hash_destroy(&ce->constants_table);
if (ce->num_interfaces > 0) {
if (!(ce->ce_flags & ZEND_ACC_RESOLVED_INTERFACES)) {
uint32_t i;
for (i = 0; i < ce->num_interfaces; i++) {
zend_string_release_ex(ce->interface_names[i].name, 0);
zend_string_release_ex(ce->interface_names[i].lc_name, 0);
}
}
efree(ce->interfaces);
}
if (ce->info.user.doc_comment) {
zend_string_release_ex(ce->info.user.doc_comment, 0);
}
if (ce->num_traits > 0) {
_destroy_zend_class_traits_info(ce);
}
break;
case ZEND_INTERNAL_CLASS:
if (ce->default_properties_table) {
zval *p = ce->default_properties_table;
zval *end = p + ce->default_properties_count;
while (p != end) {
zval_internal_ptr_dtor(p);
p++;
}
free(ce->default_properties_table);
}
if (ce->default_static_members_table) {
zval *p = ce->default_static_members_table;
zval *end = p + ce->default_static_members_count;
while (p != end) {
zval_internal_ptr_dtor(p);
p++;
}
free(ce->default_static_members_table);
if (ZEND_MAP_PTR(ce->static_members_table) != &ce->default_static_members_table) {
zend_cleanup_internal_class_data(ce);
}
}
zend_hash_destroy(&ce->properties_info);
zend_string_release_ex(ce->name, 1);
/* TODO: eliminate this loop for classes without functions with arg_info */
ZEND_HASH_FOREACH_PTR(&ce->function_table, fn) {
if ((fn->common.fn_flags & (ZEND_ACC_HAS_RETURN_TYPE|ZEND_ACC_HAS_TYPE_HINTS)) &&
fn->common.scope == ce) {
zend_free_internal_arg_info(&fn->internal_function);
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->function_table);
if (zend_hash_num_elements(&ce->constants_table)) {
zend_class_constant *c;
ZEND_HASH_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce) {
zval_internal_ptr_dtor(&c->value);
if (c->doc_comment) {
zend_string_release_ex(c->doc_comment, 1);
}
}
free(c);
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->constants_table);
}
if (ce->iterator_funcs_ptr) {
free(ce->iterator_funcs_ptr);
}
if (ce->num_interfaces > 0) {
free(ce->interfaces);
}
if (ce->properties_info_table) {
free(ce->properties_info_table);
}
free(ce);
break;
}
}
void zend_class_add_ref(zval *zv)
{
zend_class_entry *ce = Z_PTR_P(zv);
if (!(ce->ce_flags & ZEND_ACC_IMMUTABLE)) {
ce->refcount++;
}
}
ZEND_API void destroy_op_array(zend_op_array *op_array)
{
uint32_t i;
if (op_array->static_variables) {
HashTable *ht = ZEND_MAP_PTR_GET(op_array->static_variables_ptr);
if (ht && !(GC_FLAGS(ht) & IS_ARRAY_IMMUTABLE)) {
if (GC_DELREF(ht) == 0) {
zend_array_destroy(ht);
}
}
}
if ((op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE)
&& ZEND_MAP_PTR(op_array->run_time_cache)) {
efree(ZEND_MAP_PTR(op_array->run_time_cache));
}
if (op_array->function_name) {
zend_string_release_ex(op_array->function_name, 0);
}
if (!op_array->refcount || --(*op_array->refcount) > 0) {
return;
}
efree_size(op_array->refcount, sizeof(*(op_array->refcount)));
if (op_array->vars) {
i = op_array->last_var;
while (i > 0) {
i--;
zend_string_release_ex(op_array->vars[i], 0);
}
efree(op_array->vars);
}
if (op_array->literals) {
zval *literal = op_array->literals;
zval *end = literal + op_array->last_literal;
while (literal < end) {
zval_ptr_dtor_nogc(literal);
literal++;
}
if (ZEND_USE_ABS_CONST_ADDR
|| !(op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO)) {
efree(op_array->literals);
}
}
efree(op_array->opcodes);
if (op_array->doc_comment) {
zend_string_release_ex(op_array->doc_comment, 0);
}
if (op_array->live_range) {
efree(op_array->live_range);
}
if (op_array->try_catch_array) {
efree(op_array->try_catch_array);
}
if (zend_extension_flags & ZEND_EXTENSIONS_HAVE_OP_ARRAY_DTOR) {
if (op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_dtor_handler, op_array);
}
}
if (op_array->arg_info) {
uint32_t num_args = op_array->num_args;
zend_arg_info *arg_info = op_array->arg_info;
if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
arg_info--;
num_args++;
}
if (op_array->fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
for (i = 0 ; i < num_args; i++) {
if (arg_info[i].name) {
zend_string_release_ex(arg_info[i].name, 0);
}
zend_type_release(arg_info[i].type, /* persistent */ 0);
}
efree(arg_info);
}
}
static void zend_update_extended_stmts(zend_op_array *op_array)
{
zend_op *opline = op_array->opcodes, *end=opline+op_array->last;
while (opline<end) {
if (opline->opcode == ZEND_EXT_STMT) {
if (opline+1<end) {
if ((opline+1)->opcode == ZEND_EXT_STMT) {
opline->opcode = ZEND_NOP;
opline++;
continue;
}
if (opline+1<end) {
opline->lineno = (opline+1)->lineno;
}
} else {
opline->opcode = ZEND_NOP;
}
}
opline++;
}
}
static void zend_extension_op_array_handler(zend_extension *extension, zend_op_array *op_array)
{
if (extension->op_array_handler) {
extension->op_array_handler(op_array);
}
}
static void zend_check_finally_breakout(zend_op_array *op_array, uint32_t op_num, uint32_t dst_num)
{
int i;
for (i = 0; i < op_array->last_try_catch; i++) {
if ((op_num < op_array->try_catch_array[i].finally_op ||
op_num >= op_array->try_catch_array[i].finally_end)
&& (dst_num >= op_array->try_catch_array[i].finally_op &&
dst_num <= op_array->try_catch_array[i].finally_end)) {
CG(in_compilation) = 1;
CG(active_op_array) = op_array;
CG(zend_lineno) = op_array->opcodes[op_num].lineno;
zend_error_noreturn(E_COMPILE_ERROR, "jump into a finally block is disallowed");
} else if ((op_num >= op_array->try_catch_array[i].finally_op
&& op_num <= op_array->try_catch_array[i].finally_end)
&& (dst_num > op_array->try_catch_array[i].finally_end
|| dst_num < op_array->try_catch_array[i].finally_op)) {
CG(in_compilation) = 1;
CG(active_op_array) = op_array;
CG(zend_lineno) = op_array->opcodes[op_num].lineno;
zend_error_noreturn(E_COMPILE_ERROR, "jump out of a finally block is disallowed");
}
}
}
static uint32_t zend_get_brk_cont_target(const zend_op_array *op_array, const zend_op *opline) {
int nest_levels = opline->op2.num;
int array_offset = opline->op1.num;
zend_brk_cont_element *jmp_to;
do {
jmp_to = &CG(context).brk_cont_array[array_offset];
if (nest_levels > 1) {
array_offset = jmp_to->parent;
}
} while (--nest_levels > 0);
return opline->opcode == ZEND_BRK ? jmp_to->brk : jmp_to->cont;
}
static void emit_live_range_raw(
zend_op_array *op_array, uint32_t var_num, uint32_t kind, uint32_t start, uint32_t end) {
zend_live_range *range;
op_array->last_live_range++;
op_array->live_range = erealloc(op_array->live_range,
sizeof(zend_live_range) * op_array->last_live_range);
ZEND_ASSERT(start < end);
range = &op_array->live_range[op_array->last_live_range - 1];
range->var = EX_NUM_TO_VAR(op_array->last_var + var_num);
range->var |= kind;
range->start = start;
range->end = end;
}
static void emit_live_range(
zend_op_array *op_array, uint32_t var_num, uint32_t start, uint32_t end,
zend_needs_live_range_cb needs_live_range) {
zend_op *def_opline = &op_array->opcodes[start], *orig_def_opline = def_opline;
zend_op *use_opline = &op_array->opcodes[end];
uint32_t kind;
switch (def_opline->opcode) {
/* These should never be the first def. */
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_ADD_ARRAY_UNPACK:
case ZEND_ROPE_ADD:
ZEND_ASSERT(0);
return;
/* Result is boolean, it doesn't have to be destroyed. */
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_BOOL:
case ZEND_BOOL_NOT:
/* Classes don't have to be destroyed. */
case ZEND_FETCH_CLASS:
case ZEND_DECLARE_ANON_CLASS:
/* FAST_CALLs don't have to be destroyed. */
case ZEND_FAST_CALL:
return;
case ZEND_BEGIN_SILENCE:
kind = ZEND_LIVE_SILENCE;
start++;
break;
case ZEND_ROPE_INIT:
kind = ZEND_LIVE_ROPE;
/* ROPE live ranges include the generating opcode. */
def_opline--;
break;
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
kind = ZEND_LIVE_LOOP;
start++;
break;
/* Objects created via ZEND_NEW are only fully initialized
* after the DO_FCALL (constructor call).
* We are creating two live-ranges: ZEND_LINE_NEW for uninitialized
* part, and ZEND_LIVE_TMPVAR for initialized.
*/
case ZEND_NEW:
{
int level = 0;
uint32_t orig_start = start;
while (def_opline + 1 < use_opline) {
def_opline++;
start++;
if (def_opline->opcode == ZEND_DO_FCALL) {
if (level == 0) {
break;
}
level--;
} else {
switch (def_opline->opcode) {
case ZEND_INIT_FCALL:
case ZEND_INIT_FCALL_BY_NAME:
case ZEND_INIT_NS_FCALL_BY_NAME:
case ZEND_INIT_DYNAMIC_CALL:
case ZEND_INIT_USER_CALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_NEW:
level++;
break;
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
level--;
break;
}
}
}
emit_live_range_raw(op_array, var_num, ZEND_LIVE_NEW, orig_start + 1, start + 1);
if (start + 1 == end) {
/* Trivial live-range, no need to store it. */
return;
}
/* break missing intentionally */
default:
start++;
kind = ZEND_LIVE_TMPVAR;
/* Check hook to determine whether a live range is necessary,
* e.g. based on type info. */
if (needs_live_range && !needs_live_range(op_array, orig_def_opline)) {
return;
}
break;
}
case ZEND_COPY_TMP:
{
/* COPY_TMP has a split live-range: One from the definition until the use in
* "null" branch, and another from the start of the "non-null" branch to the
* FREE opcode. */
uint32_t rt_var_num = EX_NUM_TO_VAR(op_array->last_var + var_num);
zend_op *block_start_op = use_opline;
if (needs_live_range && !needs_live_range(op_array, orig_def_opline)) {
return;
}
while ((block_start_op-1)->opcode == ZEND_FREE) {
block_start_op--;
}
kind = ZEND_LIVE_TMPVAR;
start = block_start_op - op_array->opcodes;
if (start != end) {
emit_live_range_raw(op_array, var_num, kind, start, end);
}
do {
use_opline--;
} while (!(
((use_opline->op1_type & (IS_TMP_VAR|IS_VAR)) && use_opline->op1.var == rt_var_num) ||
((use_opline->op2_type & (IS_TMP_VAR|IS_VAR)) && use_opline->op2.var == rt_var_num)
));
start = def_opline + 1 - op_array->opcodes;
end = use_opline - op_array->opcodes;
emit_live_range_raw(op_array, var_num, kind, start, end);
return;
}
}
emit_live_range_raw(op_array, var_num, kind, start, end);
}
static zend_bool is_fake_def(zend_op *opline) {
/* These opcodes only modify the result, not create it. */
return opline->opcode == ZEND_ROPE_ADD
|| opline->opcode == ZEND_ADD_ARRAY_ELEMENT
|| opline->opcode == ZEND_ADD_ARRAY_UNPACK;
}
static zend_bool keeps_op1_alive(zend_op *opline) {
/* These opcodes don't consume their OP1 operand,
* it is later freed by something else. */
if (opline->opcode == ZEND_CASE
|| opline->opcode == ZEND_SWITCH_LONG
|| opline->opcode == ZEND_FETCH_LIST_R
|| opline->opcode == ZEND_COPY_TMP) {
return 1;
}
ZEND_ASSERT(opline->opcode != ZEND_SWITCH_STRING
&& opline->opcode != ZEND_FE_FETCH_R
&& opline->opcode != ZEND_FE_FETCH_RW
&& opline->opcode != ZEND_FETCH_LIST_W
&& opline->opcode != ZEND_VERIFY_RETURN_TYPE
&& opline->opcode != ZEND_BIND_LEXICAL
&& opline->opcode != ZEND_ROPE_ADD);
return 0;
}
/* Live ranges must be sorted by increasing start opline */
static int cmp_live_range(const zend_live_range *a, const zend_live_range *b) {
return a->start - b->start;
}
static void swap_live_range(zend_live_range *a, zend_live_range *b) {
uint32_t tmp;
tmp = a->var;
a->var = b->var;
b->var = tmp;
tmp = a->start;
a->start = b->start;
b->start = tmp;
tmp = a->end;
a->end = b->end;
b->end = tmp;
}
static void zend_calc_live_ranges(
zend_op_array *op_array, zend_needs_live_range_cb needs_live_range) {
uint32_t opnum = op_array->last;
zend_op *opline = &op_array->opcodes[opnum];
ALLOCA_FLAG(use_heap)
uint32_t var_offset = op_array->last_var;
uint32_t *last_use = do_alloca(sizeof(uint32_t) * op_array->T, use_heap);
memset(last_use, -1, sizeof(uint32_t) * op_array->T);
ZEND_ASSERT(!op_array->live_range);
while (opnum > 0) {
opnum--;
opline--;
if ((opline->result_type & (IS_TMP_VAR|IS_VAR)) && !is_fake_def(opline)) {
uint32_t var_num = EX_VAR_TO_NUM(opline->result.var) - var_offset;
/* Defs without uses can occur for two reasons: Either because the result is
* genuinely unused (e.g. omitted FREE opcode for an unused boolean result), or
* because there are multiple defining opcodes (e.g. JMPZ_EX and QM_ASSIGN), in
* which case the last one starts the live range. As such, we can simply ignore
* missing uses here. */
if (EXPECTED(last_use[var_num] != (uint32_t) -1)) {
/* Skip trivial live-range */
if (opnum + 1 != last_use[var_num]) {
uint32_t num;
#if 1
/* OP_DATA uses only op1 operand */
ZEND_ASSERT(opline->opcode != ZEND_OP_DATA);
num = opnum;
#else
/* OP_DATA is really part of the previous opcode. */
num = opnum - (opline->opcode == ZEND_OP_DATA);
#endif
emit_live_range(op_array, var_num, num, last_use[var_num], needs_live_range);
}
last_use[var_num] = (uint32_t) -1;
}
}
if ((opline->op1_type & (IS_TMP_VAR|IS_VAR))) {
uint32_t var_num = EX_VAR_TO_NUM(opline->op1.var) - var_offset;
if (EXPECTED(last_use[var_num] == (uint32_t) -1)) {
if (EXPECTED(!keeps_op1_alive(opline))) {
/* OP_DATA is really part of the previous opcode. */
last_use[var_num] = opnum - (opline->opcode == ZEND_OP_DATA);
}
}
}
if (opline->op2_type & (IS_TMP_VAR|IS_VAR)) {
uint32_t var_num = EX_VAR_TO_NUM(opline->op2.var) - var_offset;
if (UNEXPECTED(opline->opcode == ZEND_FE_FETCH_R
|| opline->opcode == ZEND_FE_FETCH_RW)) {
/* OP2 of FE_FETCH is actually a def, not a use. */
if (last_use[var_num] != (uint32_t) -1) {
if (opnum + 1 != last_use[var_num]) {
emit_live_range(
op_array, var_num, opnum, last_use[var_num], needs_live_range);
}
last_use[var_num] = (uint32_t) -1;
}
} else if (EXPECTED(last_use[var_num] == (uint32_t) -1)) {
#if 1
/* OP_DATA uses only op1 operand */
ZEND_ASSERT(opline->opcode != ZEND_OP_DATA);
last_use[var_num] = opnum;
#else
/* OP_DATA is really part of the previous opcode. */
last_use[var_num] = opnum - (opline->opcode == ZEND_OP_DATA);
#endif
}
}
}
if (op_array->last_live_range > 1) {
zend_live_range *r1 = op_array->live_range;
zend_live_range *r2 = r1 + op_array->last_live_range - 1;
/* In most cases we need just revert the array */
while (r1 < r2) {
swap_live_range(r1, r2);
r1++;
r2--;
}
r1 = op_array->live_range;
r2 = r1 + op_array->last_live_range - 1;
while (r1 < r2) {
if (r1->start > (r1+1)->start) {
zend_sort(r1, r2 - r1 + 1, sizeof(zend_live_range),
(compare_func_t) cmp_live_range, (swap_func_t) swap_live_range);
break;
}
r1++;
}
}
free_alloca(last_use, use_heap);
}
ZEND_API void zend_recalc_live_ranges(
zend_op_array *op_array, zend_needs_live_range_cb needs_live_range) {
/* We assume that we never create live-ranges where there were none before. */
ZEND_ASSERT(op_array->live_range);
efree(op_array->live_range);
op_array->live_range = NULL;
op_array->last_live_range = 0;
zend_calc_live_ranges(op_array, needs_live_range);
}
ZEND_API int pass_two(zend_op_array *op_array)
{
zend_op *opline, *end;
if (!ZEND_USER_CODE(op_array->type)) {
return 0;
}
if (CG(compiler_options) & ZEND_COMPILE_EXTENDED_STMT) {
zend_update_extended_stmts(op_array);
}
if (CG(compiler_options) & ZEND_COMPILE_HANDLE_OP_ARRAY) {
if (zend_extension_flags & ZEND_EXTENSIONS_HAVE_OP_ARRAY_HANDLER) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_handler, op_array);
}
}
if (CG(context).vars_size != op_array->last_var) {
op_array->vars = (zend_string**) erealloc(op_array->vars, sizeof(zend_string*)*op_array->last_var);
CG(context).vars_size = op_array->last_var;
}
#if ZEND_USE_ABS_CONST_ADDR
if (CG(context).opcodes_size != op_array->last) {
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes, sizeof(zend_op)*op_array->last);
CG(context).opcodes_size = op_array->last;
}
if (CG(context).literals_size != op_array->last_literal) {
op_array->literals = (zval*)erealloc(op_array->literals, sizeof(zval) * op_array->last_literal);
CG(context).literals_size = op_array->last_literal;
}
#else
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes,
ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
sizeof(zval) * op_array->last_literal);
if (op_array->literals) {
memcpy(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16),
op_array->literals, sizeof(zval) * op_array->last_literal);
efree(op_array->literals);
op_array->literals = (zval*)(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
}
CG(context).opcodes_size = op_array->last;
CG(context).literals_size = op_array->last_literal;
#endif
/* Needs to be set directly after the opcode/literal reallocation, to ensure destruction
* happens correctly if any of the following fixups generate a fatal error. */
op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
switch (opline->opcode) {
case ZEND_RECV_INIT:
{
zval *val = CT_CONSTANT(opline->op2);
if (Z_TYPE_P(val) == IS_CONSTANT_AST) {
uint32_t slot = ZEND_MM_ALIGNED_SIZE_EX(op_array->cache_size, 8);
Z_CACHE_SLOT_P(val) = slot;
op_array->cache_size += sizeof(zval);
}
}
break;
case ZEND_FAST_CALL:
opline->op1.opline_num = op_array->try_catch_array[opline->op1.num].finally_op;
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
break;
case ZEND_BRK:
case ZEND_CONT:
{
uint32_t jmp_target = zend_get_brk_cont_target(op_array, opline);
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
zend_check_finally_breakout(op_array, opline - op_array->opcodes, jmp_target);
}
opline->opcode = ZEND_JMP;
opline->op1.opline_num = jmp_target;
opline->op2.num = 0;
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
}
break;
case ZEND_GOTO:
zend_resolve_goto_label(op_array, opline);
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
zend_check_finally_breakout(op_array, opline - op_array->opcodes, opline->op1.opline_num);
}
/* break omitted intentionally */
case ZEND_JMP:
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
break;
case ZEND_JMPZNZ:
/* absolute index to relative offset */
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, opline->extended_value);
/* break omitted intentionally */
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op2);
break;
case ZEND_ASSERT_CHECK:
{
/* If result of assert is unused, result of check is unused as well */
zend_op *call = &op_array->opcodes[opline->op2.opline_num - 1];
if (call->opcode == ZEND_EXT_FCALL_END) {
call--;
}
if (call->result_type == IS_UNUSED) {
opline->result_type = IS_UNUSED;