forked from bytecodealliance/wasm-tools
-
Notifications
You must be signed in to change notification settings - Fork 1
/
code_builder.rs
3983 lines (3606 loc) · 141 KB
/
code_builder.rs
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
use super::{
Elements, FuncType, GlobalInitExpr, Instruction, InstructionKind::*, InstructionKinds, Module,
ValType,
};
use arbitrary::{Result, Unstructured};
use std::collections::{BTreeMap, BTreeSet};
use std::convert::TryFrom;
use wasm_encoder::{BlockType, MemArg};
macro_rules! instructions {
(
$(
($predicate:expr, $generator_fn:ident, $instruction_kind:ident $(, $cost:tt)?),
)*
) => {
static NUM_OPTIONS: usize = instructions!(
@count;
$( $generator_fn )*
);
fn choose_instruction(
u: &mut Unstructured<'_>,
module: &Module,
allowed_instructions: InstructionKinds,
builder: &mut CodeBuilder,
) -> Option<
fn(&mut Unstructured<'_>, &Module, &mut CodeBuilder) -> Result<Instruction>
> {
builder.allocs.options.clear();
let mut cost = 0;
// Unroll the loop that checks whether each instruction is valid in
// the current context and, if it is valid, pushes it onto our
// options. Unrolling this loops lets us avoid dynamic calls through
// function pointers and, furthermore, each call site can be branch
// predicted and even inlined. This saved us about 30% of time in
// the `corpus` benchmark.
$(
let predicate: Option<fn(&Module, &mut CodeBuilder) -> bool> = $predicate;
if predicate.map_or(true, |f| f(module, builder))
&& allowed_instructions.contains($instruction_kind) {
builder.allocs.options.push(($generator_fn, cost));
cost += 1000 $(- $cost)?;
}
)*
// If there aren't actually any candidate instructions due to
// various filters in place then return `None` to indicate the
// situation.
if cost == 0 {
return None;
}
let i = u.int_in_range(0..=cost).ok()?;
let idx = builder
.allocs
.options
.binary_search_by_key(&i,|p| p.1)
.unwrap_or_else(|i| i - 1);
Some(builder.allocs.options[idx].0)
}
};
( @count; ) => {
0
};
( @count; $x:ident $( $xs:ident )* ) => {
1 + instructions!( @count; $( $xs )* )
};
}
// The static set of options of instruction to generate that could be valid at
// some given time. One entry per Wasm instruction.
//
// Each entry is made up of up to three parts:
//
// 1. A predicate for whether this is a valid choice, if any. `None` means that
// the choice is always applicable.
//
// 2. The function to generate the instruction, given that we've made this
// choice.
//
// 3. The `InstructionKind` the instruction belongs to; this allows filtering
// out instructions by category.
//
// 4. An optional number used to weight how often this instruction is chosen.
// Higher numbers are less likely to be chosen, and number specified must be
// less than 1000.
instructions! {
// Control instructions.
(None, unreachable, Control, 990),
(None, nop, Control, 800),
(None, block, Control),
(None, r#loop, Control),
(Some(try_valid), r#try, Control),
(Some(delegate_valid), delegate, Control),
(Some(catch_valid), catch, Control),
(Some(catch_all_valid), catch_all, Control),
(Some(if_valid), r#if, Control),
(Some(else_valid), r#else, Control),
(Some(end_valid), end, Control),
(Some(br_valid), br, Control),
(Some(br_if_valid), br_if, Control),
(Some(br_table_valid), br_table, Control),
(Some(return_valid), r#return, Control, 900),
(Some(call_valid), call, Control),
(Some(call_indirect_valid), call_indirect, Control),
(Some(throw_valid), throw, Control, 850),
(Some(rethrow_valid), rethrow, Control),
// Parametric instructions.
(Some(drop_valid), drop, Parametric, 990),
(Some(select_valid), select, Parametric),
// Variable instructions.
(Some(local_get_valid), local_get, Variable),
(Some(local_set_valid), local_set, Variable),
(Some(local_set_valid), local_tee, Variable),
(Some(global_get_valid), global_get, Variable),
(Some(global_set_valid), global_set, Variable),
// Memory instructions.
(Some(have_memory_and_offset), i32_load, Memory),
(Some(have_memory_and_offset), i64_load, Memory),
(Some(have_memory_and_offset), f32_load, Memory),
(Some(have_memory_and_offset), f64_load, Memory),
(Some(have_memory_and_offset), i32_load_8_s, Memory),
(Some(have_memory_and_offset), i32_load_8_u, Memory),
(Some(have_memory_and_offset), i32_load_16_s, Memory),
(Some(have_memory_and_offset), i32_load_16_u, Memory),
(Some(have_memory_and_offset), i64_load_8_s, Memory),
(Some(have_memory_and_offset), i64_load_16_s, Memory),
(Some(have_memory_and_offset), i64_load_32_s, Memory),
(Some(have_memory_and_offset), i64_load_8_u, Memory),
(Some(have_memory_and_offset), i64_load_16_u, Memory),
(Some(have_memory_and_offset), i64_load_32_u, Memory),
(Some(i32_store_valid), i32_store, Memory),
(Some(i64_store_valid), i64_store, Memory),
(Some(f32_store_valid), f32_store, Memory),
(Some(f64_store_valid), f64_store, Memory),
(Some(i32_store_valid), i32_store_8, Memory),
(Some(i32_store_valid), i32_store_16, Memory),
(Some(i64_store_valid), i64_store_8, Memory),
(Some(i64_store_valid), i64_store_16, Memory),
(Some(i64_store_valid), i64_store_32, Memory),
(Some(have_memory), memory_size, Memory),
(Some(memory_grow_valid), memory_grow, Memory),
(Some(memory_init_valid), memory_init, Memory),
(Some(data_drop_valid), data_drop, Memory),
(Some(memory_copy_valid), memory_copy, Memory),
(Some(memory_fill_valid), memory_fill, Memory),
// Numeric instructions.
(None, i32_const, Numeric),
(None, i64_const, Numeric),
(None, f32_const, Numeric),
(None, f64_const, Numeric),
(Some(i32_on_stack), i32_eqz, Numeric),
(Some(i32_i32_on_stack), i32_eq, Numeric),
(Some(i32_i32_on_stack), i32_ne, Numeric),
(Some(i32_i32_on_stack), i32_lt_s, Numeric),
(Some(i32_i32_on_stack), i32_lt_u, Numeric),
(Some(i32_i32_on_stack), i32_gt_s, Numeric),
(Some(i32_i32_on_stack), i32_gt_u, Numeric),
(Some(i32_i32_on_stack), i32_le_s, Numeric),
(Some(i32_i32_on_stack), i32_le_u, Numeric),
(Some(i32_i32_on_stack), i32_ge_s, Numeric),
(Some(i32_i32_on_stack), i32_ge_u, Numeric),
(Some(i64_on_stack), i64_eqz, Numeric),
(Some(i64_i64_on_stack), i64_eq, Numeric),
(Some(i64_i64_on_stack), i64_ne, Numeric),
(Some(i64_i64_on_stack), i64_lt_s, Numeric),
(Some(i64_i64_on_stack), i64_lt_u, Numeric),
(Some(i64_i64_on_stack), i64_gt_s, Numeric),
(Some(i64_i64_on_stack), i64_gt_u, Numeric),
(Some(i64_i64_on_stack), i64_le_s, Numeric),
(Some(i64_i64_on_stack), i64_le_u, Numeric),
(Some(i64_i64_on_stack), i64_ge_s, Numeric),
(Some(i64_i64_on_stack), i64_ge_u, Numeric),
(Some(f32_f32_on_stack), f32_eq, Numeric),
(Some(f32_f32_on_stack), f32_ne, Numeric),
(Some(f32_f32_on_stack), f32_lt, Numeric),
(Some(f32_f32_on_stack), f32_gt, Numeric),
(Some(f32_f32_on_stack), f32_le, Numeric),
(Some(f32_f32_on_stack), f32_ge, Numeric),
(Some(f64_f64_on_stack), f64_eq, Numeric),
(Some(f64_f64_on_stack), f64_ne, Numeric),
(Some(f64_f64_on_stack), f64_lt, Numeric),
(Some(f64_f64_on_stack), f64_gt, Numeric),
(Some(f64_f64_on_stack), f64_le, Numeric),
(Some(f64_f64_on_stack), f64_ge, Numeric),
(Some(i32_on_stack), i32_clz, Numeric),
(Some(i32_on_stack), i32_ctz, Numeric),
(Some(i32_on_stack), i32_popcnt, Numeric),
(Some(i32_i32_on_stack), i32_add, Numeric),
(Some(i32_i32_on_stack), i32_sub, Numeric),
(Some(i32_i32_on_stack), i32_mul, Numeric),
(Some(i32_i32_on_stack), i32_div_s, Numeric),
(Some(i32_i32_on_stack), i32_div_u, Numeric),
(Some(i32_i32_on_stack), i32_rem_s, Numeric),
(Some(i32_i32_on_stack), i32_rem_u, Numeric),
(Some(i32_i32_on_stack), i32_and, Numeric),
(Some(i32_i32_on_stack), i32_or, Numeric),
(Some(i32_i32_on_stack), i32_xor, Numeric),
(Some(i32_i32_on_stack), i32_shl, Numeric),
(Some(i32_i32_on_stack), i32_shr_s, Numeric),
(Some(i32_i32_on_stack), i32_shr_u, Numeric),
(Some(i32_i32_on_stack), i32_rotl, Numeric),
(Some(i32_i32_on_stack), i32_rotr, Numeric),
(Some(i64_on_stack), i64_clz, Numeric),
(Some(i64_on_stack), i64_ctz, Numeric),
(Some(i64_on_stack), i64_popcnt, Numeric),
(Some(i64_i64_on_stack), i64_add, Numeric),
(Some(i64_i64_on_stack), i64_sub, Numeric),
(Some(i64_i64_on_stack), i64_mul, Numeric),
(Some(i64_i64_on_stack), i64_div_s, Numeric),
(Some(i64_i64_on_stack), i64_div_u, Numeric),
(Some(i64_i64_on_stack), i64_rem_s, Numeric),
(Some(i64_i64_on_stack), i64_rem_u, Numeric),
(Some(i64_i64_on_stack), i64_and, Numeric),
(Some(i64_i64_on_stack), i64_or, Numeric),
(Some(i64_i64_on_stack), i64_xor, Numeric),
(Some(i64_i64_on_stack), i64_shl, Numeric),
(Some(i64_i64_on_stack), i64_shr_s, Numeric),
(Some(i64_i64_on_stack), i64_shr_u, Numeric),
(Some(i64_i64_on_stack), i64_rotl, Numeric),
(Some(i64_i64_on_stack), i64_rotr, Numeric),
(Some(f32_on_stack), f32_abs, Numeric),
(Some(f32_on_stack), f32_neg, Numeric),
(Some(f32_on_stack), f32_ceil, Numeric),
(Some(f32_on_stack), f32_floor, Numeric),
(Some(f32_on_stack), f32_trunc, Numeric),
(Some(f32_on_stack), f32_nearest, Numeric),
(Some(f32_on_stack), f32_sqrt, Numeric),
(Some(f32_f32_on_stack), f32_add, Numeric),
(Some(f32_f32_on_stack), f32_sub, Numeric),
(Some(f32_f32_on_stack), f32_mul, Numeric),
(Some(f32_f32_on_stack), f32_div, Numeric),
(Some(f32_f32_on_stack), f32_min, Numeric),
(Some(f32_f32_on_stack), f32_max, Numeric),
(Some(f32_f32_on_stack), f32_copysign, Numeric),
(Some(f64_on_stack), f64_abs, Numeric),
(Some(f64_on_stack), f64_neg, Numeric),
(Some(f64_on_stack), f64_ceil, Numeric),
(Some(f64_on_stack), f64_floor, Numeric),
(Some(f64_on_stack), f64_trunc, Numeric),
(Some(f64_on_stack), f64_nearest, Numeric),
(Some(f64_on_stack), f64_sqrt, Numeric),
(Some(f64_f64_on_stack), f64_add, Numeric),
(Some(f64_f64_on_stack), f64_sub, Numeric),
(Some(f64_f64_on_stack), f64_mul, Numeric),
(Some(f64_f64_on_stack), f64_div, Numeric),
(Some(f64_f64_on_stack), f64_min, Numeric),
(Some(f64_f64_on_stack), f64_max, Numeric),
(Some(f64_f64_on_stack), f64_copysign, Numeric),
(Some(i64_on_stack), i32_wrap_i64, Numeric),
(Some(f32_on_stack), i32_trunc_f32_s, Numeric),
(Some(f32_on_stack), i32_trunc_f32_u, Numeric),
(Some(f64_on_stack), i32_trunc_f64_s, Numeric),
(Some(f64_on_stack), i32_trunc_f64_u, Numeric),
(Some(i32_on_stack), i64_extend_i32_s, Numeric),
(Some(i32_on_stack), i64_extend_i32_u, Numeric),
(Some(f32_on_stack), i64_trunc_f32_s, Numeric),
(Some(f32_on_stack), i64_trunc_f32_u, Numeric),
(Some(f64_on_stack), i64_trunc_f64_s, Numeric),
(Some(f64_on_stack), i64_trunc_f64_u, Numeric),
(Some(i32_on_stack), f32_convert_i32_s, Numeric),
(Some(i32_on_stack), f32_convert_i32_u, Numeric),
(Some(i64_on_stack), f32_convert_i64_s, Numeric),
(Some(i64_on_stack), f32_convert_i64_u, Numeric),
(Some(f64_on_stack), f32_demote_f64, Numeric),
(Some(i32_on_stack), f64_convert_i32_s, Numeric),
(Some(i32_on_stack), f64_convert_i32_u, Numeric),
(Some(i64_on_stack), f64_convert_i64_s, Numeric),
(Some(i64_on_stack), f64_convert_i64_u, Numeric),
(Some(f32_on_stack), f64_promote_f32, Numeric),
(Some(f32_on_stack), i32_reinterpret_f32, Numeric),
(Some(f64_on_stack), i64_reinterpret_f64, Numeric),
(Some(i32_on_stack), f32_reinterpret_i32, Numeric),
(Some(i64_on_stack), f64_reinterpret_i64, Numeric),
(Some(extendable_i32_on_stack), i32_extend_8_s, Numeric),
(Some(extendable_i32_on_stack), i32_extend_16_s, Numeric),
(Some(extendable_i64_on_stack), i64_extend_8_s, Numeric),
(Some(extendable_i64_on_stack), i64_extend_16_s, Numeric),
(Some(extendable_i64_on_stack), i64_extend_32_s, Numeric),
(Some(nontrapping_f32_on_stack), i32_trunc_sat_f32_s, Numeric),
(Some(nontrapping_f32_on_stack), i32_trunc_sat_f32_u, Numeric),
(Some(nontrapping_f64_on_stack), i32_trunc_sat_f64_s, Numeric),
(Some(nontrapping_f64_on_stack), i32_trunc_sat_f64_u, Numeric),
(Some(nontrapping_f32_on_stack), i64_trunc_sat_f32_s, Numeric),
(Some(nontrapping_f32_on_stack), i64_trunc_sat_f32_u, Numeric),
(Some(nontrapping_f64_on_stack), i64_trunc_sat_f64_s, Numeric),
(Some(nontrapping_f64_on_stack), i64_trunc_sat_f64_u, Numeric),
// reference types proposal
(Some(ref_null_valid), ref_null, Reference),
(Some(ref_func_valid), ref_func, Reference),
(Some(ref_is_null_valid), ref_is_null, Reference),
(Some(table_fill_valid), table_fill, Reference),
(Some(table_set_valid), table_set, Reference),
(Some(table_get_valid), table_get, Reference),
(Some(table_size_valid), table_size, Reference),
(Some(table_grow_valid), table_grow, Reference),
(Some(table_copy_valid), table_copy, Reference),
(Some(table_init_valid), table_init, Reference),
(Some(elem_drop_valid), elem_drop, Reference),
// SIMD instructions.
(Some(simd_have_memory_and_offset), v128_load, Vector),
(Some(simd_have_memory_and_offset), v128_load8x8s, Vector),
(Some(simd_have_memory_and_offset), v128_load8x8u, Vector),
(Some(simd_have_memory_and_offset), v128_load16x4s, Vector),
(Some(simd_have_memory_and_offset), v128_load16x4u, Vector),
(Some(simd_have_memory_and_offset), v128_load32x2s, Vector),
(Some(simd_have_memory_and_offset), v128_load32x2u, Vector),
(Some(simd_have_memory_and_offset), v128_load8_splat, Vector),
(Some(simd_have_memory_and_offset), v128_load16_splat, Vector),
(Some(simd_have_memory_and_offset), v128_load32_splat, Vector),
(Some(simd_have_memory_and_offset), v128_load64_splat, Vector),
(Some(simd_have_memory_and_offset), v128_load32_zero, Vector),
(Some(simd_have_memory_and_offset), v128_load64_zero, Vector),
(Some(simd_v128_store_valid), v128_store, Vector),
(Some(simd_have_memory_and_offset_and_v128), v128_load8_lane, Vector),
(Some(simd_have_memory_and_offset_and_v128), v128_load16_lane, Vector),
(Some(simd_have_memory_and_offset_and_v128), v128_load32_lane, Vector),
(Some(simd_have_memory_and_offset_and_v128), v128_load64_lane, Vector),
(Some(simd_v128_store_valid), v128_store8_lane, Vector),
(Some(simd_v128_store_valid), v128_store16_lane, Vector),
(Some(simd_v128_store_valid), v128_store32_lane, Vector),
(Some(simd_v128_store_valid), v128_store64_lane, Vector),
(Some(simd_enabled), v128_const, Vector),
(Some(simd_v128_v128_on_stack), i8x16_shuffle, Vector),
(Some(simd_v128_on_stack), i8x16_extract_lane_s, Vector),
(Some(simd_v128_on_stack), i8x16_extract_lane_u, Vector),
(Some(simd_v128_i32_on_stack), i8x16_replace_lane, Vector),
(Some(simd_v128_on_stack), i16x8_extract_lane_s, Vector),
(Some(simd_v128_on_stack), i16x8_extract_lane_u, Vector),
(Some(simd_v128_i32_on_stack), i16x8_replace_lane, Vector),
(Some(simd_v128_on_stack), i32x4_extract_lane, Vector),
(Some(simd_v128_i32_on_stack), i32x4_replace_lane, Vector),
(Some(simd_v128_on_stack), i64x2_extract_lane, Vector),
(Some(simd_v128_i64_on_stack), i64x2_replace_lane, Vector),
(Some(simd_v128_on_stack), f32x4_extract_lane, Vector),
(Some(simd_v128_f32_on_stack), f32x4_replace_lane, Vector),
(Some(simd_v128_on_stack), f64x2_extract_lane, Vector),
(Some(simd_v128_f64_on_stack), f64x2_replace_lane, Vector),
(Some(simd_i32_on_stack), i8x16_splat, Vector),
(Some(simd_i32_on_stack), i16x8_splat, Vector),
(Some(simd_i32_on_stack), i32x4_splat, Vector),
(Some(simd_i64_on_stack), i64x2_splat, Vector),
(Some(simd_f32_on_stack), f32x4_splat, Vector),
(Some(simd_f64_on_stack), f64x2_splat, Vector),
(Some(simd_v128_v128_on_stack), i8x16_swizzle, Vector),
(Some(simd_v128_v128_on_stack_relaxed), i8x16_relaxed_swizzle, Vector),
(Some(simd_v128_v128_v128_on_stack), v128_bitselect, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), i8x16_laneselect, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), i16x8_laneselect, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), i32x4_laneselect, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), i64x2_laneselect, Vector),
(Some(simd_v128_v128_on_stack), i8x16_eq, Vector),
(Some(simd_v128_v128_on_stack), i8x16_ne, Vector),
(Some(simd_v128_v128_on_stack), i8x16_lt_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_lt_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_gt_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_gt_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_le_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_le_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_ge_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_ge_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_eq, Vector),
(Some(simd_v128_v128_on_stack), i16x8_ne, Vector),
(Some(simd_v128_v128_on_stack), i16x8_lt_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_lt_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_gt_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_gt_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_le_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_le_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_ge_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_ge_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_eq, Vector),
(Some(simd_v128_v128_on_stack), i32x4_ne, Vector),
(Some(simd_v128_v128_on_stack), i32x4_lt_s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_lt_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_gt_s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_gt_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_le_s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_le_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_ge_s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_ge_u, Vector),
(Some(simd_v128_v128_on_stack), i64x2_eq, Vector),
(Some(simd_v128_v128_on_stack), i64x2_ne, Vector),
(Some(simd_v128_v128_on_stack), i64x2_lt_s, Vector),
(Some(simd_v128_v128_on_stack), i64x2_gt_s, Vector),
(Some(simd_v128_v128_on_stack), i64x2_le_s, Vector),
(Some(simd_v128_v128_on_stack), i64x2_ge_s, Vector),
(Some(simd_v128_v128_on_stack), f32x4_eq, Vector),
(Some(simd_v128_v128_on_stack), f32x4_ne, Vector),
(Some(simd_v128_v128_on_stack), f32x4_lt, Vector),
(Some(simd_v128_v128_on_stack), f32x4_gt, Vector),
(Some(simd_v128_v128_on_stack), f32x4_le, Vector),
(Some(simd_v128_v128_on_stack), f32x4_ge, Vector),
(Some(simd_v128_v128_on_stack), f64x2_eq, Vector),
(Some(simd_v128_v128_on_stack), f64x2_ne, Vector),
(Some(simd_v128_v128_on_stack), f64x2_lt, Vector),
(Some(simd_v128_v128_on_stack), f64x2_gt, Vector),
(Some(simd_v128_v128_on_stack), f64x2_le, Vector),
(Some(simd_v128_v128_on_stack), f64x2_ge, Vector),
(Some(simd_v128_on_stack), v128_not, Vector),
(Some(simd_v128_v128_on_stack), v128_and, Vector),
(Some(simd_v128_v128_on_stack), v128_and_not, Vector),
(Some(simd_v128_v128_on_stack), v128_or, Vector),
(Some(simd_v128_v128_on_stack), v128_xor, Vector),
(Some(simd_v128_v128_on_stack), v128_any_true, Vector),
(Some(simd_v128_on_stack), i8x16_abs, Vector),
(Some(simd_v128_on_stack), i8x16_neg, Vector),
(Some(simd_v128_on_stack), i8x16_popcnt, Vector),
(Some(simd_v128_on_stack), i8x16_all_true, Vector),
(Some(simd_v128_on_stack), i8x16_bitmask, Vector),
(Some(simd_v128_v128_on_stack), i8x16_narrow_i16x8s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_narrow_i16x8u, Vector),
(Some(simd_v128_i32_on_stack), i8x16_shl, Vector),
(Some(simd_v128_i32_on_stack), i8x16_shr_s, Vector),
(Some(simd_v128_i32_on_stack), i8x16_shr_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_add, Vector),
(Some(simd_v128_v128_on_stack), i8x16_add_sat_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_add_sat_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_sub, Vector),
(Some(simd_v128_v128_on_stack), i8x16_sub_sat_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_sub_sat_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_min_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_min_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_max_s, Vector),
(Some(simd_v128_v128_on_stack), i8x16_max_u, Vector),
(Some(simd_v128_v128_on_stack), i8x16_avgr_u, Vector),
(Some(simd_v128_on_stack), i16x8_extadd_pairwise_i8x16s, Vector),
(Some(simd_v128_on_stack), i16x8_extadd_pairwise_i8x16u, Vector),
(Some(simd_v128_on_stack), i16x8_abs, Vector),
(Some(simd_v128_on_stack), i16x8_neg, Vector),
(Some(simd_v128_v128_on_stack), i16x8q15_mulr_sat_s, Vector),
(Some(simd_v128_on_stack), i16x8_all_true, Vector),
(Some(simd_v128_on_stack), i16x8_bitmask, Vector),
(Some(simd_v128_v128_on_stack), i16x8_narrow_i32x4s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_narrow_i32x4u, Vector),
(Some(simd_v128_on_stack), i16x8_extend_low_i8x16s, Vector),
(Some(simd_v128_on_stack), i16x8_extend_high_i8x16s, Vector),
(Some(simd_v128_on_stack), i16x8_extend_low_i8x16u, Vector),
(Some(simd_v128_on_stack), i16x8_extend_high_i8x16u, Vector),
(Some(simd_v128_i32_on_stack), i16x8_shl, Vector),
(Some(simd_v128_i32_on_stack), i16x8_shr_s, Vector),
(Some(simd_v128_i32_on_stack), i16x8_shr_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_add, Vector),
(Some(simd_v128_v128_on_stack), i16x8_add_sat_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_add_sat_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_sub, Vector),
(Some(simd_v128_v128_on_stack), i16x8_sub_sat_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_sub_sat_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_mul, Vector),
(Some(simd_v128_v128_on_stack), i16x8_min_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_min_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_max_s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_max_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_avgr_u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_extmul_low_i8x16s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_extmul_high_i8x16s, Vector),
(Some(simd_v128_v128_on_stack), i16x8_extmul_low_i8x16u, Vector),
(Some(simd_v128_v128_on_stack), i16x8_extmul_high_i8x16u, Vector),
(Some(simd_v128_on_stack), i32x4_extadd_pairwise_i16x8s, Vector),
(Some(simd_v128_on_stack), i32x4_extadd_pairwise_i16x8u, Vector),
(Some(simd_v128_on_stack), i32x4_abs, Vector),
(Some(simd_v128_on_stack), i32x4_neg, Vector),
(Some(simd_v128_on_stack), i32x4_all_true, Vector),
(Some(simd_v128_on_stack), i32x4_bitmask, Vector),
(Some(simd_v128_on_stack), i32x4_extend_low_i16x8s, Vector),
(Some(simd_v128_on_stack), i32x4_extend_high_i16x8s, Vector),
(Some(simd_v128_on_stack), i32x4_extend_low_i16x8u, Vector),
(Some(simd_v128_on_stack), i32x4_extend_high_i16x8u, Vector),
(Some(simd_v128_i32_on_stack), i32x4_shl, Vector),
(Some(simd_v128_i32_on_stack), i32x4_shr_s, Vector),
(Some(simd_v128_i32_on_stack), i32x4_shr_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_add, Vector),
(Some(simd_v128_v128_on_stack), i32x4_sub, Vector),
(Some(simd_v128_v128_on_stack), i32x4_mul, Vector),
(Some(simd_v128_v128_on_stack), i32x4_min_s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_min_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_max_s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_max_u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_dot_i16x8s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_extmul_low_i16x8s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_extmul_high_i16x8s, Vector),
(Some(simd_v128_v128_on_stack), i32x4_extmul_low_i16x8u, Vector),
(Some(simd_v128_v128_on_stack), i32x4_extmul_high_i16x8u, Vector),
(Some(simd_v128_on_stack), i64x2_abs, Vector),
(Some(simd_v128_on_stack), i64x2_neg, Vector),
(Some(simd_v128_on_stack), i64x2_all_true, Vector),
(Some(simd_v128_on_stack), i64x2_bitmask, Vector),
(Some(simd_v128_on_stack), i64x2_extend_low_i32x4s, Vector),
(Some(simd_v128_on_stack), i64x2_extend_high_i32x4s, Vector),
(Some(simd_v128_on_stack), i64x2_extend_low_i32x4u, Vector),
(Some(simd_v128_on_stack), i64x2_extend_high_i32x4u, Vector),
(Some(simd_v128_i32_on_stack), i64x2_shl, Vector),
(Some(simd_v128_i32_on_stack), i64x2_shr_s, Vector),
(Some(simd_v128_i32_on_stack), i64x2_shr_u, Vector),
(Some(simd_v128_v128_on_stack), i64x2_add, Vector),
(Some(simd_v128_v128_on_stack), i64x2_sub, Vector),
(Some(simd_v128_v128_on_stack), i64x2_mul, Vector),
(Some(simd_v128_v128_on_stack), i64x2_extmul_low_i32x4s, Vector),
(Some(simd_v128_v128_on_stack), i64x2_extmul_high_i32x4s, Vector),
(Some(simd_v128_v128_on_stack), i64x2_extmul_low_i32x4u, Vector),
(Some(simd_v128_v128_on_stack), i64x2_extmul_high_i32x4u, Vector),
(Some(simd_v128_on_stack), f32x4_ceil, Vector),
(Some(simd_v128_on_stack), f32x4_floor, Vector),
(Some(simd_v128_on_stack), f32x4_trunc, Vector),
(Some(simd_v128_on_stack), f32x4_nearest, Vector),
(Some(simd_v128_on_stack), f32x4_abs, Vector),
(Some(simd_v128_on_stack), f32x4_neg, Vector),
(Some(simd_v128_on_stack), f32x4_sqrt, Vector),
(Some(simd_v128_v128_on_stack), f32x4_add, Vector),
(Some(simd_v128_v128_on_stack), f32x4_sub, Vector),
(Some(simd_v128_v128_on_stack), f32x4_mul, Vector),
(Some(simd_v128_v128_on_stack), f32x4_div, Vector),
(Some(simd_v128_v128_on_stack), f32x4_min, Vector),
(Some(simd_v128_v128_on_stack), f32x4_max, Vector),
(Some(simd_v128_v128_on_stack), f32x4p_min, Vector),
(Some(simd_v128_v128_on_stack), f32x4p_max, Vector),
(Some(simd_v128_on_stack), f64x2_ceil, Vector),
(Some(simd_v128_on_stack), f64x2_floor, Vector),
(Some(simd_v128_on_stack), f64x2_trunc, Vector),
(Some(simd_v128_on_stack), f64x2_nearest, Vector),
(Some(simd_v128_on_stack), f64x2_abs, Vector),
(Some(simd_v128_on_stack), f64x2_neg, Vector),
(Some(simd_v128_on_stack), f64x2_sqrt, Vector),
(Some(simd_v128_v128_on_stack), f64x2_add, Vector),
(Some(simd_v128_v128_on_stack), f64x2_sub, Vector),
(Some(simd_v128_v128_on_stack), f64x2_mul, Vector),
(Some(simd_v128_v128_on_stack), f64x2_div, Vector),
(Some(simd_v128_v128_on_stack), f64x2_min, Vector),
(Some(simd_v128_v128_on_stack), f64x2_max, Vector),
(Some(simd_v128_v128_on_stack), f64x2p_min, Vector),
(Some(simd_v128_v128_on_stack), f64x2p_max, Vector),
(Some(simd_v128_on_stack), i32x4_trunc_sat_f32x4s, Vector),
(Some(simd_v128_on_stack), i32x4_trunc_sat_f32x4u, Vector),
(Some(simd_v128_on_stack), f32x4_convert_i32x4s, Vector),
(Some(simd_v128_on_stack), f32x4_convert_i32x4u, Vector),
(Some(simd_v128_on_stack), i32x4_trunc_sat_f64x2s_zero, Vector),
(Some(simd_v128_on_stack), i32x4_trunc_sat_f64x2u_zero, Vector),
(Some(simd_v128_on_stack), f64x2_convert_low_i32x4s, Vector),
(Some(simd_v128_on_stack), f64x2_convert_low_i32x4u, Vector),
(Some(simd_v128_on_stack), f32x4_demote_f64x2_zero, Vector),
(Some(simd_v128_on_stack), f64x2_promote_low_f32x4, Vector),
(Some(simd_v128_on_stack_relaxed), i32x4_relaxed_trunc_sat_f32x4s, Vector),
(Some(simd_v128_on_stack_relaxed), i32x4_relaxed_trunc_sat_f32x4u, Vector),
(Some(simd_v128_on_stack_relaxed), i32x4_relaxed_trunc_sat_f64x2s_zero, Vector),
(Some(simd_v128_on_stack_relaxed), i32x4_relaxed_trunc_sat_f64x2u_zero, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), f32x4_fma, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), f32x4_fnma, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), f64x2_fma, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), f64x2_fnma, Vector),
(Some(simd_v128_v128_on_stack_relaxed), f32x4_relaxed_min, Vector),
(Some(simd_v128_v128_on_stack_relaxed), f32x4_relaxed_max, Vector),
(Some(simd_v128_v128_on_stack_relaxed), f64x2_relaxed_min, Vector),
(Some(simd_v128_v128_on_stack_relaxed), f64x2_relaxed_max, Vector),
(Some(simd_v128_v128_on_stack_relaxed), i16x8_relaxed_q15mulr_s, Vector),
(Some(simd_v128_v128_on_stack_relaxed), i16x8_dot_i8x16_i7x16_s, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), i32x4_dot_i8x16_i7x16_add_s, Vector),
(Some(simd_v128_v128_v128_on_stack_relaxed), f32x4_relaxed_dot_bf16x8_add_f32x4, Vector),
}
pub(crate) struct CodeBuilderAllocations {
// The control labels in scope right now.
controls: Vec<Control>,
// The types on the operand stack right now.
operands: Vec<Option<ValType>>,
// Dynamic set of options of instruction we can generate that are known to
// be valid right now.
options: Vec<(
fn(&mut Unstructured, &Module, &mut CodeBuilder) -> Result<Instruction>,
u32,
)>,
// Cached information about the module that we're generating functions for,
// used to speed up validity checks. The mutable globals map is a map of the
// type of global to the global indices which have that type (and they're
// all mutable).
mutable_globals: BTreeMap<ValType, Vec<u32>>,
// Like mutable globals above this is a map from function types to the list
// of functions that have that function type.
functions: BTreeMap<Vec<ValType>, Vec<u32>>,
// Like functions above this is a map from tag types to the list of tags
// have that tag type.
tags: BTreeMap<Vec<ValType>, Vec<u32>>,
// Tables in this module which have a funcref element type.
funcref_tables: Vec<u32>,
// Functions that are referenced in the module through globals and segments.
referenced_functions: Vec<u32>,
// Flag that indicates if any element segments have the same type as any
// table
table_init_possible: bool,
// Lists of memory indices which are either 32-bit or 64-bit. This is used
// for faster lookup in validating instructions to know which memories have
// which types. For example if there are no 64-bit memories then we
// shouldn't ever look for i64 on the stack for `i32.load`.
memory32: Vec<u32>,
memory64: Vec<u32>,
}
pub(crate) struct CodeBuilder<'a> {
func_ty: &'a FuncType,
locals: &'a mut Vec<ValType>,
allocs: &'a mut CodeBuilderAllocations,
// Temporary locals injected and used by nan canonicalization. Note that
// this list of extra locals is appended to `self.locals` at the end of code
// generation, and it's kept separate here to avoid using these locals in
// `local.get` and similar instructions.
extra_locals: Vec<ValType>,
f32_scratch: Option<usize>,
f64_scratch: Option<usize>,
v128_scratch: Option<usize>,
}
/// A control frame.
#[derive(Debug, Clone)]
struct Control {
kind: ControlKind,
/// Value types that must be on the stack when entering this control frame.
params: Vec<ValType>,
/// Value types that are left on the stack when exiting this control frame.
results: Vec<ValType>,
/// How far down the operand stack instructions inside this control frame
/// can reach.
height: usize,
}
impl Control {
fn label_types(&self) -> &[ValType] {
if self.kind == ControlKind::Loop {
&self.params
} else {
&self.results
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
enum ControlKind {
Block,
If,
Loop,
Try,
Catch,
CatchAll,
}
enum Float {
F32,
F64,
F32x4,
F64x2,
}
impl CodeBuilderAllocations {
pub(crate) fn new(module: &Module) -> Self {
let mut mutable_globals = BTreeMap::new();
for (i, global) in module.globals.iter().enumerate() {
if global.mutable {
mutable_globals
.entry(global.val_type)
.or_insert(Vec::new())
.push(i as u32);
}
}
let mut tags = BTreeMap::new();
for (idx, tag_type) in module.tags() {
tags.entry(tag_type.func_type.params.to_vec())
.or_insert(Vec::new())
.push(idx);
}
let mut functions = BTreeMap::new();
for (idx, func) in module.funcs() {
functions
.entry(func.params.to_vec())
.or_insert(Vec::new())
.push(idx);
}
let mut funcref_tables = Vec::new();
let mut table_tys = Vec::new();
for (i, table) in module.tables.iter().enumerate() {
table_tys.push(table.element_type);
if table.element_type == ValType::FuncRef {
funcref_tables.push(i as u32);
}
}
let mut referenced_functions = BTreeSet::new();
for (_, expr) in module.defined_globals.iter() {
if let GlobalInitExpr::FuncRef(i) = *expr {
referenced_functions.insert(i);
}
}
for g in module.elems.iter() {
match &g.items {
Elements::Expressions(e) => {
let iter = e.iter().filter_map(|i| *i);
referenced_functions.extend(iter);
}
Elements::Functions(e) => {
referenced_functions.extend(e.iter().cloned());
}
}
}
let table_init_possible = module.elems.iter().any(|e| table_tys.contains(&e.ty));
let mut memory32 = Vec::new();
let mut memory64 = Vec::new();
for (i, mem) in module.memories.iter().enumerate() {
if mem.memory64 {
memory64.push(i as u32);
} else {
memory32.push(i as u32);
}
}
CodeBuilderAllocations {
controls: Vec::with_capacity(4),
operands: Vec::with_capacity(16),
options: Vec::with_capacity(NUM_OPTIONS),
functions,
tags,
mutable_globals,
funcref_tables,
referenced_functions: referenced_functions.into_iter().collect(),
table_init_possible,
memory32,
memory64,
}
}
pub(crate) fn builder<'a>(
&'a mut self,
func_ty: &'a FuncType,
locals: &'a mut Vec<ValType>,
) -> CodeBuilder<'a> {
self.controls.clear();
self.controls.push(Control {
kind: ControlKind::Block,
params: vec![],
results: func_ty.results.to_vec(),
height: 0,
});
self.operands.clear();
self.options.clear();
CodeBuilder {
func_ty,
locals,
allocs: self,
extra_locals: Vec::new(),
f32_scratch: None,
f64_scratch: None,
v128_scratch: None,
}
}
}
impl CodeBuilder<'_> {
/// Get the operands that are in-scope within the current control frame.
fn operands(&self) -> &[Option<ValType>] {
let height = self.allocs.controls.last().map_or(0, |c| c.height);
&self.allocs.operands[height..]
}
fn pop_operands(&mut self, to_pop: &[ValType]) {
debug_assert!(self.types_on_stack(to_pop));
self.allocs
.operands
.truncate(self.allocs.operands.len() - to_pop.len());
}
fn push_operands(&mut self, to_push: &[ValType]) {
self.allocs
.operands
.extend(to_push.iter().copied().map(Some));
}
fn label_types_on_stack(&self, to_check: &Control) -> bool {
self.types_on_stack(to_check.label_types())
}
fn type_on_stack(&self, ty: ValType) -> bool {
match self.operands().last() {
None => false,
Some(None) => true,
Some(Some(x)) => *x == ty,
}
}
fn types_on_stack(&self, types: &[ValType]) -> bool {
self.operands().len() >= types.len()
&& self
.operands()
.iter()
.rev()
.zip(types.iter().rev())
.all(|(a, b)| match (a, b) {
(None, _) => true,
(Some(x), y) => x == y,
})
}
#[inline(never)]
fn arbitrary_block_type(&self, u: &mut Unstructured, module: &Module) -> Result<BlockType> {
let mut options: Vec<Box<dyn Fn(&mut Unstructured) -> Result<BlockType>>> = vec![
Box::new(|_| Ok(BlockType::Empty)),
Box::new(|u| Ok(BlockType::Result(module.arbitrary_valtype(u)?))),
];
if module.config.multi_value_enabled() {
for (i, ty) in module.func_types() {
if self.types_on_stack(&ty.params) {
options.push(Box::new(move |_| Ok(BlockType::FunctionType(i as u32))));
}
}
}
let f = u.choose(&options)?;
f(u)
}
pub(crate) fn arbitrary(
mut self,
u: &mut Unstructured,
module: &Module,
) -> Result<Vec<Instruction>> {
let max_instructions = module.config.max_instructions();
let allowed_instructions = module.config.allowed_instructions();
let mut instructions = vec![];
while !self.allocs.controls.is_empty() {
let keep_going = instructions.len() < max_instructions
&& u.arbitrary().map_or(false, |b: u8| b != 0);
if !keep_going {
self.end_active_control_frames(u, &mut instructions);
break;
}
match choose_instruction(u, module, allowed_instructions, &mut self) {
Some(f) => {
let inst = f(u, module, &mut self)?;
instructions.push(inst);
}
// Choosing an instruction can fail because there is not enough
// underlying data, so we really cannot generate any more
// instructions. In this case we swallow that error and instead
// just terminate our wasm function's frames.
None => {
self.end_active_control_frames(u, &mut instructions);
break;
}
}
// If the configuration for this module requests nan
// canonicalization then perform that here based on whether or not
// the previous instruction needs canonicalization. Note that this
// is based off Cranelift's pass for nan canonicalization for which
// instructions to canonicalize, but the general idea is most
// floating-point operations.
if module.config.canonicalize_nans() {
match instructions.last().unwrap() {
Instruction::F32Ceil
| Instruction::F32Floor
| Instruction::F32Nearest
| Instruction::F32Sqrt
| Instruction::F32Trunc
| Instruction::F32Div
| Instruction::F32Max
| Instruction::F32Min
| Instruction::F32Mul
| Instruction::F32Sub
| Instruction::F32Add => self.canonicalize_nan(Float::F32, &mut instructions),
Instruction::F64Ceil
| Instruction::F64Floor
| Instruction::F64Nearest
| Instruction::F64Sqrt
| Instruction::F64Trunc
| Instruction::F64Div
| Instruction::F64Max
| Instruction::F64Min
| Instruction::F64Mul
| Instruction::F64Sub
| Instruction::F64Add => self.canonicalize_nan(Float::F64, &mut instructions),
Instruction::F32x4Ceil
| Instruction::F32x4Floor
| Instruction::F32x4Nearest
| Instruction::F32x4Sqrt
| Instruction::F32x4Trunc
| Instruction::F32x4Div
| Instruction::F32x4Max
| Instruction::F32x4Min
| Instruction::F32x4Mul
| Instruction::F32x4Sub
| Instruction::F32x4Add => {
self.canonicalize_nan(Float::F32x4, &mut instructions)
}
Instruction::F64x2Ceil
| Instruction::F64x2Floor
| Instruction::F64x2Nearest
| Instruction::F64x2Sqrt
| Instruction::F64x2Trunc
| Instruction::F64x2Div
| Instruction::F64x2Max
| Instruction::F64x2Min
| Instruction::F64x2Mul
| Instruction::F64x2Sub
| Instruction::F64x2Add => {
self.canonicalize_nan(Float::F64x2, &mut instructions)
}
_ => {}
}
}
}
self.locals.extend(self.extra_locals.drain(..));
Ok(instructions)
}
fn canonicalize_nan(&mut self, ty: Float, ins: &mut Vec<Instruction>) {
// We'll need to temporarily save the top of the stack into a local, so
// figure out that local here. Note that this tries to use the same
// local if canonicalization happens more than once in a function.
let local = match ty {
Float::F32 => &mut self.f32_scratch,
Float::F64 => &mut self.f64_scratch,
Float::F32x4 | Float::F64x2 => &mut self.v128_scratch,
};
let local = match *local {
Some(i) => i,
None => {
let val = self.locals.len() + self.func_ty.params.len() + self.extra_locals.len();
*local = Some(val);
self.extra_locals.push(match ty {
Float::F32 => ValType::F32,
Float::F64 => ValType::F64,
Float::F32x4 | Float::F64x2 => ValType::V128,
});
val
}
};
let local = local as u32;
// Save the previous instruction's result into a local. This also leaves
// a value on the stack as `val1` for the `select` instruction.
ins.push(Instruction::LocalTee(local));
// The `val2` value input to the `select` below, our nan pattern.
//
// The nan patterns here are chosen to be a canonical representation
// which is still NaN but the wasm will always produce the same bits of
// a nan so if the wasm takes a look at the nan inside it'll always see
// the same representation.
const CANON_32BIT_NAN: u32 = 0b01111111110000000000000000000000;
const CANON_64BIT_NAN: u64 =
0b0111111111111000000000000000000000000000000000000000000000000000;
ins.push(match ty {
Float::F32 => Instruction::F32Const(f32::from_bits(CANON_32BIT_NAN)),
Float::F64 => Instruction::F64Const(f64::from_bits(CANON_64BIT_NAN)),
Float::F32x4 => {
let nan = CANON_32BIT_NAN as i128;
let nan = nan | (nan << 32) | (nan << 64) | (nan << 96);
Instruction::V128Const(nan)
}
Float::F64x2 => {
let nan = CANON_64BIT_NAN as i128;
let nan = nan | (nan << 64);
Instruction::V128Const(nan)
}
});
// the condition of the `select`, which is the float's equality test
// with itself.
ins.push(Instruction::LocalGet(local));
ins.push(Instruction::LocalGet(local));
ins.push(match ty {
Float::F32 => Instruction::F32Eq,
Float::F64 => Instruction::F64Eq,
Float::F32x4 => Instruction::F32x4Eq,
Float::F64x2 => Instruction::F64x2Eq,
});
// Select the result. If the condition is nonzero (aka the float is
// equal to itself) it picks `val1`, otherwise if zero (aka the float
// is nan) it picks `val2`.
ins.push(match ty {
Float::F32 | Float::F64 => Instruction::Select,
Float::F32x4 | Float::F64x2 => Instruction::V128Bitselect,
});