aboutsummaryrefslogtreecommitdiffstats
path: root/backends/smt2/smtio.py
blob: ab20a4af2ce28a70aaa916e05114ed43447b8e55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
#
# yosys -- Yosys Open SYnthesis Suite
#
# Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

import sys, re, os, signal
import subprocess
if os.name == "posix":
    import resource
from copy import deepcopy
from select import select
from time import time
from queue import Queue, Empty
from threading import Thread


# This is needed so that the recursive SMT2 S-expression parser
# does not run out of stack frames when parsing large expressions
if os.name == "posix":
    smtio_reclimit = 64 * 1024
    if sys.getrecursionlimit() < smtio_reclimit:
        sys.setrecursionlimit(smtio_reclimit)

    current_rlimit_stack = resource.getrlimit(resource.RLIMIT_STACK)
    if current_rlimit_stack[0] != resource.RLIM_INFINITY:
        smtio_stacksize = 128 * 1024 * 1024
        if os.uname().sysname == "Darwin":
            # MacOS has rather conservative stack limits
            smtio_stacksize = 16 * 1024 * 1024
        if current_rlimit_stack[1] != resource.RLIM_INFINITY:
            smtio_stacksize = min(smtio_stacksize, current_rlimit_stack[1])
        if current_rlimit_stack[0] < smtio_stacksize:
            resource.setrlimit(resource.RLIMIT_STACK, (smtio_stacksize, current_rlimit_stack[1]))


# currently running solvers (so we can kill them)
running_solvers = dict()
forced_shutdown = False
solvers_index = 0

def force_shutdown(signum, frame):
    global forced_shutdown
    if not forced_shutdown:
        forced_shutdown = True
        if signum is not None:
            print("<%s>" % signal.Signals(signum).name)
        for p in running_solvers.values():
            # os.killpg(os.getpgid(p.pid), signal.SIGTERM)
            os.kill(p.pid, signal.SIGTERM)
    sys.exit(1)

if os.name == "posix":
    signal.signal(signal.SIGHUP, force_shutdown)
signal.signal(signal.SIGINT, force_shutdown)
signal.signal(signal.SIGTERM, force_shutdown)

def except_hook(exctype, value, traceback):
    if not forced_shutdown:
        sys.__excepthook__(exctype, value, traceback)
    force_shutdown(None, None)

sys.excepthook = except_hook


hex_dict = {
    "0": "0000", "1": "0001", "2": "0010", "3": "0011",
    "4": "0100", "5": "0101", "6": "0110", "7": "0111",
    "8": "1000", "9": "1001", "A": "1010", "B": "1011",
    "C": "1100", "D": "1101", "E": "1110", "F": "1111",
    "a": "1010", "b": "1011", "c": "1100", "d": "1101",
    "e": "1110", "f": "1111"
}


class SmtModInfo:
    def __init__(self):
        self.inputs = set()
        self.outputs = set()
        self.registers = set()
        self.memories = dict()
        self.wires = set()
        self.wsize = dict()
        self.clocks = dict()
        self.cells = dict()
        self.asserts = dict()
        self.covers = dict()
        self.anyconsts = dict()
        self.anyseqs = dict()
        self.allconsts = dict()
        self.allseqs = dict()
        self.asize = dict()


class SmtIo:
    def __init__(self, opts=None):
        global solvers_index

        self.logic = None
        self.logic_qf = True
        self.logic_ax = True
        self.logic_uf = True
        self.logic_bv = True
        self.logic_dt = False
        self.forall = False
        self.produce_models = True
        self.smt2cache = [list()]
        self.p = None
        self.p_index = solvers_index
        solvers_index += 1

        if opts is not None:
            self.logic = opts.logic
            self.solver = opts.solver
            self.solver_opts = opts.solver_opts
            self.debug_print = opts.debug_print
            self.debug_file = opts.debug_file
            self.dummy_file = opts.dummy_file
            self.timeinfo = opts.timeinfo
            self.unroll = opts.unroll
            self.noincr = opts.noincr
            self.info_stmts = opts.info_stmts
            self.nocomments = opts.nocomments

        else:
            self.solver = "yices"
            self.solver_opts = list()
            self.debug_print = False
            self.debug_file = None
            self.dummy_file = None
            self.timeinfo = os.name != "nt"
            self.unroll = False
            self.noincr = False
            self.info_stmts = list()
            self.nocomments = False

        self.start_time = time()

        self.modinfo = dict()
        self.curmod = None
        self.topmod = None
        self.setup_done = False

    def __del__(self):
        if self.p is not None and not forced_shutdown:
            os.killpg(os.getpgid(self.p.pid), signal.SIGTERM)
            if running_solvers is not None:
                del running_solvers[self.p_index]

    def setup(self):
        assert not self.setup_done

        if self.forall:
            self.unroll = False

        if self.solver == "yices":
            if self.noincr:
                self.popen_vargs = ['yices-smt2'] + self.solver_opts
            else:
                self.popen_vargs = ['yices-smt2', '--incremental'] + self.solver_opts

        if self.solver == "z3":
            self.popen_vargs = ['z3', '-smt2', '-in'] + self.solver_opts

        if self.solver == "cvc4":
            if self.noincr:
                self.popen_vargs = ['cvc4', '--lang', 'smt2.6' if self.logic_dt else 'smt2'] + self.solver_opts
            else:
                self.popen_vargs = ['cvc4', '--incremental', '--lang', 'smt2.6' if self.logic_dt else 'smt2'] + self.solver_opts

        if self.solver == "mathsat":
            self.popen_vargs = ['mathsat'] + self.solver_opts

        if self.solver == "boolector":
            if self.noincr:
                self.popen_vargs = ['boolector', '--smt2'] + self.solver_opts
            else:
                self.popen_vargs = ['boolector', '--smt2', '-i'] + self.solver_opts
            self.unroll = True

        if self.solver == "abc":
            if len(self.solver_opts) > 0:
                self.popen_vargs = ['yosys-abc', '-S', '; '.join(self.solver_opts)]
            else:
                self.popen_vargs = ['yosys-abc', '-S', '%blast; &sweep -C 5000; &syn4; &cec -s -m -C 2000']
            self.logic_ax = False
            self.unroll = True
            self.noincr = True

        if self.solver == "dummy":
            assert self.dummy_file is not None
            self.dummy_fd = open(self.dummy_file, "r")
        else:
            if self.dummy_file is not None:
                self.dummy_fd = open(self.dummy_file, "w")
            if not self.noincr:
                self.p_open()

        if self.unroll:
            assert not self.forall
            self.logic_uf = False
            self.unroll_idcnt = 0
            self.unroll_buffer = ""
            self.unroll_sorts = set()
            self.unroll_objs = set()
            self.unroll_decls = dict()
            self.unroll_cache = dict()
            self.unroll_stack = list()

        if self.logic is None:
            self.logic = ""
            if self.logic_qf: self.logic += "QF_"
            if self.logic_ax: self.logic += "A"
            if self.logic_uf: self.logic += "UF"
            if self.logic_bv: self.logic += "BV"
            if self.logic_dt: self.logic = "ALL"

        self.setup_done = True

        for stmt in self.info_stmts:
            self.write(stmt)

        if self.produce_models:
            self.write("(set-option :produce-models true)")

        self.write("(set-logic %s)" % self.logic)

    def timestamp(self):
        secs = int(time() - self.start_time)
        return "## %3d:%02d:%02d " % (secs // (60*60), (secs // 60) % 60, secs % 60)

    def replace_in_stmt(self, stmt, pat, repl):
        if stmt == pat:
            return repl

        if isinstance(stmt, list):
            return [self.replace_in_stmt(s, pat, repl) for s in stmt]

        return stmt

    def unroll_stmt(self, stmt):
        if not isinstance(stmt, list):
            return stmt

        stmt = [self.unroll_stmt(s) for s in stmt]

        if len(stmt) >= 2 and not isinstance(stmt[0], list) and stmt[0] in self.unroll_decls:
            assert stmt[1] in self.unroll_objs

            key = tuple(stmt)
            if key not in self.unroll_cache:
                decl = deepcopy(self.unroll_decls[key[0]])

                self.unroll_cache[key] = "|UNROLL#%d|" % self.unroll_idcnt
                decl[1] = self.unroll_cache[key]
                self.unroll_idcnt += 1

                if decl[0] == "declare-fun":
                    if isinstance(decl[3], list) or decl[3] not in self.unroll_sorts:
                        self.unroll_objs.add(decl[1])
                        decl[2] = list()
                    else:
                        self.unroll_objs.add(decl[1])
                        decl = list()

                elif decl[0] == "define-fun":
                    arg_index = 1
                    for arg_name, arg_sort in decl[2]:
                        decl[4] = self.replace_in_stmt(decl[4], arg_name, key[arg_index])
                        arg_index += 1
                    decl[2] = list()

                if len(decl) > 0:
                    decl = self.unroll_stmt(decl)
                    self.write(self.unparse(decl), unroll=False)

            return self.unroll_cache[key]

        return stmt

    def p_thread_main(self):
        while True:
            data = self.p.stdout.readline().decode("ascii")
            if data == "": break
            self.p_queue.put(data)
        self.p_queue.put("")
        self.p_running = False

    def p_open(self):
        assert self.p is None
        self.p = subprocess.Popen(self.popen_vargs, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        running_solvers[self.p_index] = self.p
        self.p_running = True
        self.p_next = None
        self.p_queue = Queue()
        self.p_thread = Thread(target=self.p_thread_main)
        self.p_thread.start()

    def p_write(self, data, flush):
        assert self.p is not None
        self.p.stdin.write(bytes(data, "ascii"))
        if flush: self.p.stdin.flush()

    def p_read(self):
        assert self.p is not None
        if self.p_next is not None:
            data = self.p_next
            self.p_next = None
            return data
        if not self.p_running:
            return ""
        return self.p_queue.get()

    def p_poll(self, timeout=0.1):
        assert self.p is not None
        assert self.p_running
        if self.p_next is not None:
            return False
        try:
            self.p_next = self.p_queue.get(True, timeout)
            return False
        except Empty:
            return True

    def p_close(self):
        assert self.p is not None
        self.p.stdin.close()
        self.p_thread.join()
        assert not self.p_running
        del running_solvers[self.p_index]
        self.p = None
        self.p_next = None
        self.p_queue = None
        self.p_thread = None

    def write(self, stmt, unroll=True):
        if stmt.startswith(";"):
            self.info(stmt)
            if not self.setup_done:
                self.info_stmts.append(stmt)
                return
        elif not self.setup_done:
            self.setup()

        stmt = stmt.strip()

        if self.nocomments or self.unroll:
            stmt = re.sub(r" *;.*", "", stmt)
            if stmt == "": return

        if unroll and self.unroll:
            stmt = self.unroll_buffer + stmt
            self.unroll_buffer = ""

            s = re.sub(r"\|[^|]*\|", "", stmt)
            if s.count("(") != s.count(")"):
                self.unroll_buffer = stmt + " "
                return

            s = self.parse(stmt)

            if self.debug_print:
                print("-> %s" % s)

            if len(s) == 3 and s[0] == "declare-sort" and s[2] == "0":
                self.unroll_sorts.add(s[1])
                return

            elif len(s) == 4 and s[0] == "declare-fun" and s[2] == [] and s[3] in self.unroll_sorts:
                self.unroll_objs.add(s[1])
                return

            elif len(s) >= 4 and s[0] == "declare-fun":
                for arg_sort in s[2]:
                    if arg_sort in self.unroll_sorts:
                        self.unroll_decls[s[1]] = s
                        return

            elif len(s) >= 4 and s[0] == "define-fun":
                for arg_name, arg_sort in s[2]:
                    if arg_sort in self.unroll_sorts:
                        self.unroll_decls[s[1]] = s
                        return

            stmt = self.unparse(self.unroll_stmt(s))

            if stmt == "(push 1)":
                self.unroll_stack.append((
                    deepcopy(self.unroll_sorts),
                    deepcopy(self.unroll_objs),
                    deepcopy(self.unroll_decls),
                    deepcopy(self.unroll_cache),
                ))

            if stmt == "(pop 1)":
                self.unroll_sorts, self.unroll_objs, self.unroll_decls, self.unroll_cache = self.unroll_stack.pop()

        if self.debug_print:
            print("> %s" % stmt)

        if self.debug_file:
            print(stmt, file=self.debug_file)
            self.debug_file.flush()

        if self.solver != "dummy":
            if self.noincr:
                if self.p is not None and not stmt.startswith("(get-"):
                    self.p_close()
                if stmt == "(push 1)":
                    self.smt2cache.append(list())
                elif stmt == "(pop 1)":
                    self.smt2cache.pop()
                else:
                    if self.p is not None:
                        self.p_write(stmt + "\n", True)
                    self.smt2cache[-1].append(stmt)
            else:
                self.p_write(stmt + "\n", True)

    def info(self, stmt):
        if not stmt.startswith("; yosys-smt2-"):
            return

        fields = stmt.split()

        if fields[1] == "yosys-smt2-nomem":
            if self.logic is None:
                self.logic_ax = False

        if fields[1] == "yosys-smt2-nobv":
            if self.logic is None:
                self.logic_bv = False

        if fields[1] == "yosys-smt2-stdt":
            if self.logic is None:
                self.logic_dt = True

        if fields[1] == "yosys-smt2-forall":
            if self.logic is None:
                self.logic_qf = False
            self.forall = True

        if fields[1] == "yosys-smt2-module":
            self.curmod = fields[2]
            self.modinfo[self.curmod] = SmtModInfo()

        if fields[1] == "yosys-smt2-cell":
            self.modinfo[self.curmod].cells[fields[3]] = fields[2]

        if fields[1] == "yosys-smt2-topmod":
            self.topmod = fields[2]

        if fields[1] == "yosys-smt2-input":
            self.modinfo[self.curmod].inputs.add(fields[2])
            self.modinfo[self.curmod].wsize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-output":
            self.modinfo[self.curmod].outputs.add(fields[2])
            self.modinfo[self.curmod].wsize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-register":
            self.modinfo[self.curmod].registers.add(fields[2])
            self.modinfo[self.curmod].wsize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-memory":
            self.modinfo[self.curmod].memories[fields[2]] = (int(fields[3]), int(fields[4]), int(fields[5]), int(fields[6]), fields[7] == "async")

        if fields[1] == "yosys-smt2-wire":
            self.modinfo[self.curmod].wires.add(fields[2])
            self.modinfo[self.curmod].wsize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-clock":
            for edge in fields[3:]:
                if fields[2] not in self.modinfo[self.curmod].clocks:
                    self.modinfo[self.curmod].clocks[fields[2]] = edge
                elif self.modinfo[self.curmod].clocks[fields[2]] != edge:
                    self.modinfo[self.curmod].clocks[fields[2]] = "event"

        if fields[1] == "yosys-smt2-assert":
            self.modinfo[self.curmod].asserts["%s_a %s" % (self.curmod, fields[2])] = fields[3]

        if fields[1] == "yosys-smt2-cover":
            self.modinfo[self.curmod].covers["%s_c %s" % (self.curmod, fields[2])] = fields[3]

        if fields[1] == "yosys-smt2-anyconst":
            self.modinfo[self.curmod].anyconsts[fields[2]] = (fields[4], None if len(fields) <= 5 else fields[5])
            self.modinfo[self.curmod].asize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-anyseq":
            self.modinfo[self.curmod].anyseqs[fields[2]] = (fields[4], None if len(fields) <= 5 else fields[5])
            self.modinfo[self.curmod].asize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-allconst":
            self.modinfo[self.curmod].allconsts[fields[2]] = (fields[4], None if len(fields) <= 5 else fields[5])
            self.modinfo[self.curmod].asize[fields[2]] = int(fields[3])

        if fields[1] == "yosys-smt2-allseq":
            self.modinfo[self.curmod].allseqs[fields[2]] = (fields[4], None if len(fields) <= 5 else fields[5])
            self.modinfo[self.curmod].asize[fields[2]] = int(fields[3])

    def hiernets(self, top, regs_only=False):
        def hiernets_worker(nets, mod, cursor):
            for netname in sorted(self.modinfo[mod].wsize.keys()):
                if not regs_only or netname in self.modinfo[mod].registers:
                    nets.append(cursor + [netname])
            for cellname, celltype in sorted(self.modinfo[mod].cells.items()):
                hiernets_worker(nets, celltype, cursor + [cellname])

        nets = list()
        hiernets_worker(nets, top, [])
        return nets

    def hieranyconsts(self, top):
        def worker(results, mod, cursor):
            for name, value in sorted(self.modinfo[mod].anyconsts.items()):
                width = self.modinfo[mod].asize[name]
                results.append((cursor, name, value[0], value[1], width))
            for cellname, celltype in sorted(self.modinfo[mod].cells.items()):
                worker(results, celltype, cursor + [cellname])

        results = list()
        worker(results, top, [])
        return results

    def hieranyseqs(self, top):
        def worker(results, mod, cursor):
            for name, value in sorted(self.modinfo[mod].anyseqs.items()):
                width = self.modinfo[mod].asize[name]
                results.append((cursor, name, value[0], value[1], width))
            for cellname, celltype in sorted(self.modinfo[mod].cells.items()):
                worker(results, celltype, cursor + [cellname])

        results = list()
        worker(results, top, [])
        return results

    def hierallconsts(self, top):
        def worker(results, mod, cursor):
            for name, value in sorted(self.modinfo[mod].allconsts.items()):
                width = self.modinfo[mod].asize[name]
                results.append((cursor, name, value[0], value[1], width))
            for cellname, celltype in sorted(self.modinfo[mod].cells.items()):
                worker(results, celltype, cursor + [cellname])

        results = list()
        worker(results, top, [])
        return results

    def hierallseqs(self, top):
        def worker(results, mod, cursor):
            for name, value in sorted(self.modinfo[mod].allseqs.items()):
                width = self.modinfo[mod].asize[name]
                results.append((cursor, name, value[0], value[1], width))
            for cellname, celltype in sorted(self.modinfo[mod].cells.items()):
                worker(results, celltype, cursor + [cellname])

        results = list()
        worker(results, top, [])
        return results

    def hiermems(self, top):
        def hiermems_worker(mems, mod, cursor):
            for memname in sorted(self.modinfo[mod].memories.keys()):
                mems.append(cursor + [memname])
            for cellname, celltype in sorted(self.modinfo[mod].cells.items()):
                hiermems_worker(mems, celltype, cursor + [cellname])

        mems = list()
        hiermems_worker(mems, top, [])
        return mems

    def read(self):
        stmt = []
        count_brackets = 0

        while True:
            if self.solver == "dummy":
                line = self.dummy_fd.readline().strip()
            else:
                line = self.p_read().strip()
                if self.dummy_file is not None:
                    self.dummy_fd.write(line + "\n")

            count_brackets += line.count("(")
            count_brackets -= line.count(")")
            stmt.append(line)

            if self.debug_print:
                print("< %s" % line)
            if count_brackets == 0:
                break
            if self.solver != "dummy" and self.p.poll():
                print("%s Solver terminated unexpectedly: %s" % (self.timestamp(), "".join(stmt)), flush=True)
                sys.exit(1)

        stmt = "".join(stmt)
        if stmt.startswith("(error"):
            print("%s Solver Error: %s" % (self.timestamp(), stmt), flush=True)
            if self.solver != "dummy":
                self.p_close()
            sys.exit(1)

        return stmt

    def check_sat(self):
        if self.debug_print:
            print("> (check-sat)")
        if self.debug_file and not self.nocomments:
            print("; running check-sat..", file=self.debug_file)
            self.debug_file.flush()

        if self.solver != "dummy":
            if self.noincr:
                if self.p is not None:
                    self.p_close()
                self.p_open()
                for cache_ctx in self.smt2cache:
                    for cache_stmt in cache_ctx:
                        self.p_write(cache_stmt + "\n", False)

            self.p_write("(check-sat)\n", True)

            if self.timeinfo:
                i = 0
                s = "/-\|"

                count = 0
                num_bs = 0
                while self.p_poll():
                    count += 1

                    if count < 25:
                        continue

                    if count % 10 == 0 or count == 25:
                        secs = count // 10

                        if secs < 60:
                            m = "(%d seconds)" % secs
                        elif secs < 60*60:
                            m = "(%d seconds -- %d:%02d)" % (secs, secs // 60, secs % 60)
                        else:
                            m = "(%d seconds -- %d:%02d:%02d)" % (secs, secs // (60*60), (secs // 60) % 60, secs % 60)

                        print("%s %s %c" % ("\b \b" * num_bs, m, s[i]), end="", file=sys.stderr)
                        num_bs = len(m) + 3

                    else:
                        print("\b" + s[i], end="", file=sys.stderr)

                    sys.stderr.flush()
                    i = (i + 1) % len(s)

                if num_bs != 0:
                    print("\b \b" * num_bs, end="", file=sys.stderr)
                    sys.stderr.flush()

            else:
                count = 0
                while self.p_poll(60):
                    count += 1
                    msg = None

                    if count == 1:
                        msg = "1 minute"

                    elif count in [5, 10, 15, 30]:
                        msg = "%d minutes" % count

                    elif count == 60:
                        msg = "1 hour"

                    elif count % 60 == 0:
                        msg = "%d hours" % (count // 60)

                    if msg is not None:
                        print("%s waiting for solver (%s)" % (self.timestamp(), msg), flush=True)

        result = self.read()

        if self.debug_file:
            print("(set-info :status %s)" % result, file=self.debug_file)
            print("(check-sat)", file=self.debug_file)
            self.debug_file.flush()

        if result not in ["sat", "unsat"]:
            if result == "":
                print("%s Unexpected EOF response from solver." % (self.timestamp()), flush=True)
            else:
                print("%s Unexpected response from solver: %s" % (self.timestamp(), result), flush=True)
            if self.solver != "dummy":
                self.p_close()
            sys.exit(1)

        return result

    def parse(self, stmt):
        def worker(stmt):
            if stmt[0] == '(':
                expr = []
                cursor = 1
                while stmt[cursor] != ')':
                    el, le = worker(stmt[cursor:])
                    expr.append(el)
                    cursor += le
                return expr, cursor+1

            if stmt[0] == '|':
                expr = "|"
                cursor = 1
                while stmt[cursor] != '|':
                    expr += stmt[cursor]
                    cursor += 1
                expr += "|"
                return expr, cursor+1

            if stmt[0] in [" ", "\t", "\r", "\n"]:
                el, le = worker(stmt[1:])
                return el, le+1

            expr = ""
            cursor = 0
            while stmt[cursor] not in ["(", ")", "|", " ", "\t", "\r", "\n"]:
                expr += stmt[cursor]
                cursor += 1
            return expr, cursor
        return worker(stmt)[0]

    def unparse(self, stmt):
        if isinstance(stmt, list):
            return "(" + " ".join([self.unparse(s) for s in stmt]) + ")"
        return stmt

    def bv2hex(self, v):
        h = ""
        v = self.bv2bin(v)
        while len(v) > 0:
            d = 0
            if len(v) > 0 and v[-1] == "1": d += 1
            if len(v) > 1 and v[-2] == "1": d += 2
            if len(v) > 2 and v[-3] == "1": d += 4
            if len(v) > 3 and v[-4] == "1": d += 8
            h = hex(d)[2:] + h
            if len(v) < 4: break
            v = v[:-4]
        return h

    def bv2bin(self, v):
        if type(v) is list and len(v) == 3 and v[0] == "_" and v[1].startswith("bv"):
            x, n = int(v[1][2:]), int(v[2])
            return "".join("1" if (x & (1 << i)) else "0" for i in range(n-1, -1, -1))
        if v == "true": return "1"
        if v == "false": return "0"
        if v.startswith("#b"):
            return v[2:]
        if v.startswith("#x"):
            return "".join(hex_dict.get(x) for x in v[2:])
        assert False

    def bv2int(self, v):
        return int(self.bv2bin(v), 2)

    def get(self, expr):
        self.write("(get-value (%s))" % (expr))
        return self.parse(self.read())[0][1]

    def get_list(self, expr_list):
        if len(expr_list) == 0:
            return []
        self.write("(get-value (%s))" % " ".join(expr_list))
        return [n[1] for n in self.parse(self.read())]

    def get_path(self, mod, path):
        assert mod in self.modinfo
        path = path.replace("\\", "/").split(".")

        for i in range(len(path)-1):
            first = ".".join(path[0:i+1])
            second = ".".join(path[i+1:])

            if first in self.modinfo[mod].cells:
                nextmod = self.modinfo[mod].cells[first]
                return [first] + self.get_path(nextmod, second)

        return [".".join(path)]

    def net_expr(self, mod, base, path):
        if len(path) == 0:
            return base

        if len(path) == 1:
            assert mod in self.modinfo
            if path[0] == "":
                return base
            if path[0] in self.modinfo[mod].cells:
                return "(|%s_h %s| %s)" % (mod, path[0], base)
            if path[0] in self.modinfo[mod].wsize:
                return "(|%s_n %s| %s)" % (mod, path[0], base)
            if path[0] in self.modinfo[mod].memories:
                return "(|%s_m %s| %s)" % (mod, path[0], base)
            assert 0

        assert mod in self.modinfo
        assert path[0] in self.modinfo[mod].cells

        nextmod = self.modinfo[mod].cells[path[0]]
        nextbase = "(|%s_h %s| %s)" % (mod, path[0], base)
        return self.net_expr(nextmod, nextbase, path[1:])

    def net_width(self, mod, net_path):
        for i in range(len(net_path)-1):
            assert mod in self.modinfo
            assert net_path[i] in self.modinfo[mod].cells
            mod = self.modinfo[mod].cells[net_path[i]]

        assert mod in self.modinfo
        assert net_path[-1] in self.modinfo[mod].wsize
        return self.modinfo[mod].wsize[net_path[-1]]

    def net_clock(self, mod, net_path):
        for i in range(len(net_path)-1):
            assert mod in self.modinfo
            assert net_path[i] in self.modinfo[mod].cells
            mod = self.modinfo[mod].cells[net_path[i]]

        assert mod in self.modinfo
        if net_path[-1] not in self.modinfo[mod].clocks:
            return None
        return self.modinfo[mod].clocks[net_path[-1]]

    def net_exists(self, mod, net_path):
        for i in range(len(net_path)-1):
            if mod not in self.modinfo: return False
            if net_path[i] not in self.modinfo[mod].cells: return False
            mod = self.modinfo[mod].cells[net_path[i]]

        if mod not in self.modinfo: return False
        if net_path[-1] not in self.modinfo[mod].wsize: return False
        return True

    def mem_exists(self, mod, mem_path):
        for i in range(len(mem_path)-1):
            if mod not in self.modinfo: return False
            if mem_path[i] not in self.modinfo[mod].cells: return False
            mod = self.modinfo[mod].cells[mem_path[i]]

        if mod not in self.modinfo: return False
        if mem_path[-1] not in self.modinfo[mod].memories: return False
        return True

    def mem_expr(self, mod, base, path, port=None, infomode=False):
        if len(path) == 1:
            assert mod in self.modinfo
            assert path[0] in self.modinfo[mod].memories
            if infomode:
                return self.modinfo[mod].memories[path[0]]
            return "(|%s_m%s %s| %s)" % (mod, "" if port is None else ":%s" % port, path[0], base)

        assert mod in self.modinfo
        assert path[0] in self.modinfo[mod].cells

        nextmod = self.modinfo[mod].cells[path[0]]
        nextbase = "(|%s_h %s| %s)" % (mod, path[0], base)
        return self.mem_expr(nextmod, nextbase, path[1:], port=port, infomode=infomode)

    def mem_info(self, mod, path):
        return self.mem_expr(mod, "", path, infomode=True)

    def get_net(self, mod_name, net_path, state_name):
        return self.get(self.net_expr(mod_name, state_name, net_path))

    def get_net_list(self, mod_name, net_path_list, state_name):
        return self.get_list([self.net_expr(mod_name, state_name, n) for n in net_path_list])

    def get_net_hex(self, mod_name, net_path, state_name):
        return self.bv2hex(self.get_net(mod_name, net_path, state_name))

    def get_net_hex_list(self, mod_name, net_path_list, state_name):
        return [self.bv2hex(v) for v in self.get_net_list(mod_name, net_path_list, state_name)]

    def get_net_bin(self, mod_name, net_path, state_name):
        return self.bv2bin(self.get_net(mod_name, net_path, state_name))

    def get_net_bin_list(self, mod_name, net_path_list, state_name):
        return [self.bv2bin(v) for v in self.get_net_list(mod_name, net_path_list, state_name)]

    def wait(self):
        if self.p is not None:
            self.p.wait()
            self.p_close()


class SmtOpts:
    def __init__(self):
        self.shortopts = "s:S:v"
        self.longopts = ["unroll", "noincr", "noprogress", "dump-smt2=", "logic=", "dummy=", "info=", "nocomments"]
        self.solver = "yices"
        self.solver_opts = list()
        self.debug_print = False
        self.debug_file = None
        self.dummy_file = None
        self.unroll = False
        self.noincr = False
        self.timeinfo = os.name != "nt"
        self.logic = None
        self.info_stmts = list()
        self.nocomments = False

    def handle(self, o, a):
        if o == "-s":
            self.solver = a
        elif o == "-S":
            self.solver_opts.append(a)
        elif o == "-v":
            self.debug_print = True
        elif o == "--unroll":
            self.unroll = True
        elif o == "--noincr":
            self.noincr = True
        elif o == "--noprogress":
            self.timeinfo = False
        elif o == "--dump-smt2":
            self.debug_file = open(a, "w")
        elif o == "--logic":
            self.logic = a
        elif o == "--dummy":
            self.dummy_file = a
        elif o == "--info":
            self.info_stmts.append(a)
        elif o == "--nocomments":
            self.nocomments = True
        else:
            return False
        return True

    def helpmsg(self):
        return """
    -s <solver>
        set SMT solver: z3, yices, boolector, cvc4, mathsat, dummy
        default: yices

    -S <opt>
        pass <opt> as command line argument to the solver

    --logic <smt2_logic>
        use the specified SMT2 logic (e.g. QF_AUFBV)

    --dummy <filename>
        if solver is "dummy", read solver output from that file
        otherwise: write solver output to that file

    -v
        enable debug output

    --unroll
        unroll uninterpreted functions

    --noincr
        don't use incremental solving, instead restart solver for
        each (check-sat). This also avoids (push) and (pop).

    --noprogress
        disable timer display during solving
        (this option is set implicitly on Windows)

    --dump-smt2 <filename>
        write smt2 statements to file

    --info <smt2-info-stmt>
        include the specified smt2 info statement in the smt2 output

    --nocomments
        strip all comments from the generated smt2 code
"""


class MkVcd:
    def __init__(self, f):
        self.f = f
        self.t = -1
        self.nets = dict()
        self.clocks = dict()

    def add_net(self, path, width):
        path = tuple(path)
        assert self.t == -1
        key = "n%d" % len(self.nets)
        self.nets[path] = (key, width)

    def add_clock(self, path, edge):
        path = tuple(path)
        assert self.t == -1
        key = "n%d" % len(self.nets)
        self.nets[path] = (key, 1)
        self.clocks[path] = (key, edge)

    def set_net(self, path, bits):
        path = tuple(path)
        assert self.t >= 0
        assert path in self.nets
        if path not in self.clocks:
            print("b%s %s" % (bits, self.nets[path][0]), file=self.f)

    def escape_name(self, name):
        name = re.sub(r"\[([0-9a-zA-Z_]*[a-zA-Z_][0-9a-zA-Z_]*)\]", r"<\1>", name)
        if re.match("[\[\]]", name) and name[0] != "\\":
            name = "\\" + name
        return name

    def set_time(self, t):
        assert t >= self.t
        if t != self.t:
            if self.t == -1:
                print("$var integer 32 t smt_step $end", file=self.f)
                print("$var event 1 ! smt_clock $end", file=self.f)

                scope = []
                for path in sorted(self.nets):
                    key, width = self.nets[path]

                    uipath = list(path)
                    if "." in uipath[-1]:
                        uipath = uipath[0:-1] + uipath[-1].split(".")
                    for i in range(len(uipath)):
                        uipath[i] = re.sub(r"\[([^\]]*)\]", r"<\1>", uipath[i])

                    while uipath[:len(scope)] != scope:
                        print("$upscope $end", file=self.f)
                        scope = scope[:-1]

                    while uipath[:-1] != scope:
                        print("$scope module %s $end" % uipath[len(scope)], file=self.f)
                        scope.append(uipath[len(scope)])

                    if path in self.clocks and self.clocks[path][1] == "event":
                        print("$var event 1 %s %s $end" % (key, uipath[-1]), file=self.f)
                    else:
                        print("$var wire %d %s %s $end" % (width, key, uipath[-1]), file=self.f)

                for i in range(len(scope)):
                    print("$upscope $end", file=self.f)

                print("$enddefinitions $end", file=self.f)

            self.t = t
            assert self.t >= 0

            if self.t > 0:
                print("#%d" % (10 * self.t - 5), file=self.f)
                for path in sorted(self.clocks.keys()):
                    if self.clocks[path][1] == "posedge":
                        print("b0 %s" % self.nets[path][0], file=self.f)
                    elif self.clocks[path][1] == "negedge":
                        print("b1 %s" % self.nets[path][0], file=self.f)

            print("#%d" % (10 * self.t), file=self.f)
            print("1!", file=self.f)
            print("b%s t" % format(self.t, "032b"), file=self.f)

            for path in sorted(self.clocks.keys()):
                if self.clocks[path][1] == "negedge":
                    print("b0 %s" % self.nets[path][0], file=self.f)
                else:
                    print("b1 %s" % self.nets[path][0], file=self.f)