forked from steveicarus/iverilog
-
Notifications
You must be signed in to change notification settings - Fork 1
/
vvp_scope.c
1588 lines (1327 loc) · 38 KB
/
vvp_scope.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
/*
* Copyright (c) 2001 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: vvp_scope.c,v 1.77 2002/08/12 01:35:04 steve Exp $"
#endif
# include "vvp_priv.h"
# include <assert.h>
#ifdef HAVE_MALLOC_H
# include <malloc.h>
#endif
# include <stdlib.h>
# include <string.h>
/*
* Escape non-symbol chararacters in ids, and quotes in strings.
*/
inline static char hex_digit(unsigned i)
{
i &= 0xf;
return i>=10 ? i-10+'A' : i+'0';
}
const char *vvp_mangle_id(const char *id)
{
static char *out = 0x0;
static size_t out_len;
int nesc = 0;
int iout = 0;
const char *inp = id;
const char nosym[] = "!\"#%&'()*+,-/:;<=>?@[\\]^`{|}~";
char *se = strpbrk(inp, nosym);
if (!se)
return id;
do {
int n = se - inp;
int nlen = strlen(id) + 4*(++nesc) + 1;
if (out_len < nlen) {
out = (char *) realloc(out, nlen);
assert(out);
out_len = nlen;
}
if (n) {
strncpy(out+iout, inp, n);
iout += n;
}
inp += n+1;
out[iout++] = '\\';
switch (*se) {
case '\\':
case '/':
case '<':
case '>':
out[iout++] = *se;
break;
default:
out[iout++] = 'x';
out[iout++] = hex_digit(*se >> 4);
out[iout++] = hex_digit(*se);
break;
}
se = strpbrk(inp, nosym);
} while (se);
strcpy(out+iout, inp);
return out;
}
const char *vvp_mangle_name(const char *id)
{
static char *out = 0x0;
static size_t out_len;
int nesc = 0;
int iout = 0;
const char *inp = id;
const char nosym[] = "\"\\";
char *se = strpbrk(inp, nosym);
if (!se)
return id;
do {
int n = se - inp;
int nlen = strlen(id) + 2*(++nesc) + 1;
if (out_len < nlen) {
out = (char *) realloc(out, nlen);
assert(out);
out_len = nlen;
}
if (n) {
strncpy(out+iout, inp, n);
iout += n;
}
inp += n+1;
out[iout++] = '\\';
out[iout++] = *se;
se = strpbrk(inp, nosym);
} while (se);
strcpy(out+iout, inp);
return out;
}
/*
* Given a signal, generate a string name that is suitable for use as
* a label. The only rule is that the same signal will always have the
* same label. The result is stored in static memory, so remember to
* copy it out.
*/
const char* vvp_signal_label(ivl_signal_t sig)
{
static char buf[32];
sprintf(buf, "$%p", sig);
return buf;
}
/*
* This makes a string suitable for use as a label for memories.
*/
const char* vvp_memory_label(ivl_memory_t mem)
{
static char buf[32];
sprintf(buf, "$%p", mem);
return buf;
}
ivl_signal_type_t signal_type_of_nexus(ivl_nexus_t nex)
{
unsigned idx;
ivl_signal_type_t out = IVL_SIT_TRI;
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
ivl_signal_type_t stype;
ivl_nexus_ptr_t ptr = ivl_nexus_ptr(nex, idx);
ivl_signal_t sig = ivl_nexus_ptr_sig(ptr);
if (sig == 0)
continue;
stype = ivl_signal_type(sig);
if (stype == IVL_SIT_REG)
continue;
if (stype == IVL_SIT_TRI)
continue;
if (stype == IVL_SIT_NONE)
continue;
out = stype;
}
return out;
}
ivl_nexus_ptr_t ivl_logic_pin_ptr(ivl_net_logic_t net, unsigned pin)
{
ivl_nexus_t nex = ivl_logic_pin(net, pin);
unsigned idx;
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
ivl_nexus_ptr_t ptr = ivl_nexus_ptr(nex, idx);
ivl_net_logic_t tmp = ivl_nexus_ptr_log(ptr);
if (tmp == 0)
continue;
if (tmp != net)
continue;
if (ivl_nexus_ptr_pin(ptr) != pin)
continue;
return ptr;
}
assert(0);
return 0;
}
const char*drive_string(ivl_drive_t drive)
{
switch (drive) {
case IVL_DR_HiZ:
return "";
case IVL_DR_SMALL:
return "sm";
case IVL_DR_MEDIUM:
return "me";
case IVL_DR_WEAK:
return "we";
case IVL_DR_LARGE:
return "la";
case IVL_DR_PULL:
return "pu";
case IVL_DR_STRONG:
return "";
case IVL_DR_SUPPLY:
return "su";
}
return "";
}
/*
* The draw_scope function draws the major functional items within a
* scope. This includes the scopes themselves, of course. All the
* other functions in this file are in support of that task.
*/
/*
* NEXUS
* ivl builds up the netlist into objects connected together by
* ivl_nexus_t objects. The nexus receives all the drivers of the
* point in the net and resolves the value. The result is then sent to
* all the nets that are connected to the nexus. The nets, then, are
* read to get the value of the nexus.
*
* NETS
* Nets are interesting and special, because a nexus may be connected
* to several of them at once. This can happen, for example, as an
* artifact of module port connects, where the inside and the outside
* of the module are connected through an in-out port. (In fact, ivl
* will simply connect signals that are bound through a port, because
* the input/output/inout properties are enforced as compile time.)
*
* This case is handled by choosing one to receive the value of the
* nexus. This one then feeds to another net at the nexus, and so
* on. The last net is selected as the output of the nexus.
*/
/*
* This function takes a nexus and looks for an input functor. It then
* draws to the output a string that represents that functor. What we
* are trying to do here is find the input to the net that is attached
* to this nexus.
*/
static const char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
{
static char result[2048];
unsigned idx;
unsigned nptr_pin = ivl_nexus_ptr_pin(nptr);
ivl_net_const_t cptr;
ivl_net_logic_t lptr;
ivl_signal_t sptr;
ivl_lpm_t lpm;
lptr = ivl_nexus_ptr_log(nptr);
if (lptr && (ivl_logic_type(lptr) == IVL_LO_BUFZ) && (nptr_pin == 0))
do {
if (ivl_nexus_ptr_drive0(nptr) != IVL_DR_STRONG)
break;
if (ivl_nexus_ptr_drive1(nptr) != IVL_DR_STRONG)
break;
if (ivl_logic_delay(lptr, 0) != 0)
break;
if (nex == ivl_logic_pin(lptr, 1))
break;
return draw_net_input(ivl_logic_pin(lptr, 1));
} while(0);
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLDOWN)) {
return "C<pu0>";
}
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLUP)) {
return "C<pu1>";
}
if (lptr && (nptr_pin == 0)) {
sprintf(result, "L_%s", vvp_mangle_id(ivl_logic_name(lptr)));
return result;
}
sptr = ivl_nexus_ptr_sig(nptr);
if (sptr && (ivl_signal_type(sptr) == IVL_SIT_REG)) {
sprintf(result, "V_%s[%u]", vvp_signal_label(sptr), nptr_pin);
return result;
}
cptr = ivl_nexus_ptr_con(nptr);
if (cptr) {
const char*bits = ivl_const_bits(cptr);
ivl_drive_t drive;
switch (bits[nptr_pin]) {
case '0':
drive = ivl_nexus_ptr_drive0(nptr);
if (drive == IVL_DR_HiZ)
sprintf(result, "C<z>");
else
sprintf(result, "C<%s0>", drive_string(drive));
break;
case '1':
drive = ivl_nexus_ptr_drive1(nptr);
if (drive == IVL_DR_HiZ)
sprintf(result, "C<z>");
else
sprintf(result, "C<%s1>", drive_string(drive));
break;
default:
sprintf(result, "C<%c>", bits[nptr_pin]);
}
return result;
}
lpm = ivl_nexus_ptr_lpm(nptr);
if (lpm) switch (ivl_lpm_type(lpm)) {
case IVL_LPM_MUX:
for (idx = 0 ; idx < ivl_lpm_width(lpm) ; idx += 1)
if (ivl_lpm_q(lpm, idx) == nex) {
sprintf(result, "L_%s/%u",
vvp_mangle_id(ivl_lpm_name(lpm)), idx);
return result;
}
break;
case IVL_LPM_RAM:
case IVL_LPM_ADD:
case IVL_LPM_SHIFTL:
case IVL_LPM_SHIFTR:
case IVL_LPM_SUB:
case IVL_LPM_MULT:
case IVL_LPM_DIVIDE:
case IVL_LPM_MOD:
case IVL_LPM_UFUNC:
for (idx = 0 ; idx < ivl_lpm_width(lpm) ; idx += 1)
if (ivl_lpm_q(lpm, idx) == nex) {
sprintf(result, "L_%s[%u]",
vvp_mangle_id(ivl_lpm_name(lpm)), idx);
return result;
}
break;
case IVL_LPM_CMP_GE:
case IVL_LPM_CMP_GT:
case IVL_LPM_CMP_EQ:
case IVL_LPM_CMP_NE:
if (ivl_lpm_q(lpm, 0) == nex) {
sprintf(result, "L_%s", vvp_mangle_id(ivl_lpm_name(lpm)));
return result;
}
break;
}
fprintf(stderr, "internal error: no input to nexus %s\n",
ivl_nexus_name(nex));
assert(0);
return "C<z>";
}
/*
* This function draws the input to a net. What that means is that it
* returns a static string that can be used to represent a resolved
* driver to a nexus. If there are multiple drivers to the nexus, then
* it writes out the resolver declarations needed to perform strength
* resolution.
*
* The string that this returns is bound to the nexus, so the pointer
* remains valid.
*/
const char* draw_net_input(ivl_nexus_t nex)
{
ivl_signal_type_t res;
char result[512];
unsigned idx;
int level;
unsigned ndrivers = 0;
static ivl_nexus_ptr_t *drivers = 0x0;
static unsigned adrivers = 0;
const char*resolv_type;
/* If this nexus already has a label, then its input is
already figured out. Just return the existing label. */
char*nex_private = (char*)ivl_nexus_get_private(nex);
if (nex_private)
return nex_private;
res = signal_type_of_nexus(nex);
switch (res) {
case IVL_SIT_TRI:
resolv_type = "tri";
break;
case IVL_SIT_TRI0:
resolv_type = "tri0";
break;
case IVL_SIT_TRI1:
resolv_type = "tri1";
break;
/* Catch the special cases that the nets are supply
nets. Drive constant values uncomditionally. */
case IVL_SIT_SUPPLY0:
nex_private = "C<su0>";
ivl_nexus_set_private(nex, nex_private);
return nex_private;
case IVL_SIT_SUPPLY1:
nex_private = "C<su1>";
ivl_nexus_set_private(nex, nex_private);
return nex_private;
default:
fprintf(stderr, "vvp.tgt: Unsupported signal type: %u\n", res);
assert(0);
resolv_type = "tri";
break;
}
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
ivl_nexus_ptr_t nptr = ivl_nexus_ptr(nex, idx);
/* Skip input only pins. */
if ((ivl_nexus_ptr_drive0(nptr) == IVL_DR_HiZ)
&& (ivl_nexus_ptr_drive1(nptr) == IVL_DR_HiZ))
continue;
/* Save this driver. */
if (ndrivers >= adrivers) {
adrivers += 4;
drivers = (ivl_nexus_ptr_t*)
realloc(drivers, adrivers*sizeof(ivl_nexus_ptr_t));
assert(drivers);
}
drivers[ndrivers] = nptr;
ndrivers += 1;
}
/* If the nexus has no drivers, then send a constant HiZ into
the net. */
if (ndrivers == 0) {
switch (res) {
case IVL_SIT_TRI:
nex_private = "C<z>";
break;
case IVL_SIT_TRI0:
nex_private = "C<0>";
break;
case IVL_SIT_TRI1:
nex_private = "C<1>";
break;
default:
assert(0);
}
ivl_nexus_set_private(nex, nex_private);
return nex_private;
}
/* If the nexus has exactly one driver, then simply draw
it. Note that this will *not* work if the nexus is not a
TRI type nexus. */
if (ndrivers == 1 && res == IVL_SIT_TRI) {
nex_private = strdup(draw_net_input_drive(nex, drivers[0]));
ivl_nexus_set_private(nex, nex_private);
return nex_private;
}
level = 0;
while (ndrivers) {
int inst;
for (inst = 0; inst < ndrivers; inst += 4) {
if (ndrivers > 4)
fprintf(vvp_out, "RS_%s/%d/%d .resolv tri",
vvp_mangle_id(ivl_nexus_name(nex)),
level, inst);
else
fprintf(vvp_out, "RS_%s .resolv %s",
vvp_mangle_id(ivl_nexus_name(nex)),
resolv_type);
for (idx = inst; idx < ndrivers && idx < inst+4; idx += 1) {
if (level) {
fprintf(vvp_out, ", RS_%s/%d/%d",
vvp_mangle_id(ivl_nexus_name(nex)),
level - 1,
idx*4);
} else {
fprintf(vvp_out, ", %s",
draw_net_input_drive(nex, drivers[idx]));
}
}
for ( ; idx < inst+4 ; idx += 1)
fprintf(vvp_out, ", C<z>");
fprintf(vvp_out, ";\n");
}
if (ndrivers > 4)
ndrivers = (ndrivers+3) / 4;
else
ndrivers = 0;
level += 1;
}
sprintf(result, "RS_%s", vvp_mangle_id(ivl_nexus_name(nex)));
nex_private = strdup(result);
ivl_nexus_set_private(nex, nex_private);
return nex_private;
}
/*
* This function looks at the nexus in search of the net to attach
* functor inputs to. Sort the signals in the nexus by name, and
* choose the lexically earliest one.
*/
void draw_input_from_net(ivl_nexus_t nex)
{
const char*nex_private = (const char*)ivl_nexus_get_private(nex);
if (nex_private == 0)
nex_private = draw_net_input(nex);
assert(nex_private);
fprintf(vvp_out, "%s", nex_private);
}
/*
* This function draws a reg/int/variable in the scope. This is a very
* simple device to draw as there are no inputs to connect so no need
* to scan the nexus.
*/
static void draw_reg_in_scope(ivl_signal_t sig)
{
int msb = ivl_signal_pins(sig) - 1;
int lsb = 0;
const char*signed_flag = ivl_signal_integer(sig) ? "/i" :
ivl_signal_signed(sig)? "/s" : "";
fprintf(vvp_out, "V_%s .var%s \"%s\", %d, %d;\n",
vvp_signal_label(sig), signed_flag,
vvp_mangle_name(ivl_signal_basename(sig)), msb, lsb);
}
/*
* This function draws a net. This is a bit more complicated as we
* have to find an appropriate functor to connect to the input.
*/
static void draw_net_in_scope(ivl_signal_t sig)
{
unsigned idx;
int msb = ivl_signal_pins(sig) - 1;
int lsb = 0;
typedef const char*const_charp;
const_charp* args;
const char*signed_flag = ivl_signal_signed(sig)? "/s" : "";
/* Skip the local signal. */
if (ivl_signal_local(sig))
return;
args = (const_charp*)calloc(ivl_signal_pins(sig), sizeof(char*));
/* Connect all the pins of the signal to something. */
for (idx = 0 ; idx < ivl_signal_pins(sig) ; idx += 1) {
ivl_nexus_t nex = ivl_signal_pin(sig, idx);
args[idx] = draw_net_input(nex);
}
fprintf(vvp_out, "V_%s .net%s \"%s\", %d, %d",
vvp_signal_label(sig), signed_flag,
vvp_mangle_name(ivl_signal_basename(sig)), msb, lsb);
for (idx = 0 ; idx < ivl_signal_pins(sig) ; idx += 1) {
fprintf(vvp_out, ", %s", args[idx]);
}
fprintf(vvp_out, ";\n");
free(args);
}
static void draw_delay(ivl_net_logic_t lptr)
{
unsigned d0 = ivl_logic_delay(lptr, 0);
unsigned d1 = ivl_logic_delay(lptr, 1);
unsigned d2 = ivl_logic_delay(lptr, 2);
if (d0 == 0 && d1 == 0 && d2 == 0)
return;
if (d0 == d1 && d1 == d2)
fprintf(vvp_out, " (%d)", d0);
else
fprintf(vvp_out, " (%d,%d,%d)", d0, d1, d2);
}
static void draw_udp_def(ivl_udp_t udp)
{
unsigned init;
int i;
switch (ivl_udp_init(udp))
{
case '0':
init = 0;
break;
case '1':
init = 1;
break;
default:
init = 2;
break;
}
if (ivl_udp_sequ(udp))
fprintf(vvp_out,
"UDP_%s .udp/sequ \"%s\", %d, %d",
vvp_mangle_id(ivl_udp_name(udp)),
vvp_mangle_name(ivl_udp_name(udp)),
ivl_udp_nin(udp),
init );
else
fprintf(vvp_out,
"UDP_%s .udp/comb \"%s\", %d",
vvp_mangle_id(ivl_udp_name(udp)),
vvp_mangle_name(ivl_udp_name(udp)),
ivl_udp_nin(udp));
for (i=0; i<ivl_udp_rows(udp); i++)
fprintf(vvp_out, "\n ,\"%s\"", ivl_udp_row(udp, i) );
fprintf(vvp_out, ";\n");
}
static void draw_udp_in_scope(ivl_net_logic_t lptr)
{
unsigned pdx;
ivl_udp_t udp = ivl_logic_udp(lptr);
static ivl_udp_t *udps = 0x0;
static int nudps = 0;
int i;
for (i=0; i<nudps; i++)
if (udps[i] == udp)
break;
if (i >= nudps)
{
udps = (ivl_udp_t*)realloc(udps, (nudps+1)*sizeof(ivl_udp_t));
assert(udps);
udps[nudps++] = udp;
draw_udp_def(udp);
}
fprintf(vvp_out, "L_%s .udp",
vvp_mangle_id(ivl_logic_name(lptr)));
fprintf(vvp_out, " UDP_%s",
vvp_mangle_id(ivl_udp_name(udp)));
draw_delay(lptr);
for (pdx = 1 ; pdx < ivl_logic_pins(lptr) ; pdx += 1)
{
ivl_nexus_t nex = ivl_logic_pin(lptr, pdx);
fprintf(vvp_out, ", ");
draw_input_from_net(nex);
}
fprintf(vvp_out, ";\n");
}
static void draw_logic_in_scope(ivl_net_logic_t lptr)
{
unsigned pdx;
const char*ltype = "?";
const char*lcasc = 0x0;
char identity_val = '0';
ivl_drive_t str0, str1;
int level;
int ninp = ivl_logic_pins(lptr) - 1;
typedef const char*const_charp;
const_charp*input_strings = calloc(ninp, sizeof(const_charp));
for (pdx = 0 ; pdx < ninp ; pdx += 1)
input_strings[pdx] = draw_net_input(ivl_logic_pin(lptr, pdx+1));
switch (ivl_logic_type(lptr)) {
case IVL_LO_UDP:
draw_udp_in_scope(lptr);
return;
case IVL_LO_BUFZ: {
/* Draw bufz objects, but only if the output drive
is different from the input. */
ivl_nexus_ptr_t nptr = ivl_logic_pin_ptr(lptr,0);
ivl_drive_t dr0 = ivl_nexus_ptr_drive0(nptr);
ivl_drive_t dr1 = ivl_nexus_ptr_drive1(nptr);
ltype = "BUFZ";
if (dr0 != IVL_DR_STRONG)
break;
if (dr1 != IVL_DR_STRONG)
break;
if (ivl_logic_delay(lptr, 0) != 0)
break;
if (ivl_logic_pin(lptr, 0) == ivl_logic_pin(lptr, 1))
break;
return;
}
case IVL_LO_PULLDOWN:
case IVL_LO_PULLUP:
/* Skip pullup and pulldown objects. Things that have
pull objects as inputs will instead generate the
appropriate C<?> symbol. */
return;
case IVL_LO_AND:
ltype = "AND";
identity_val = '1';
break;
case IVL_LO_BUF:
ltype = "BUF";
break;
case IVL_LO_BUFIF0:
ltype = "BUFIF0";
break;
case IVL_LO_BUFIF1:
ltype = "BUFIF1";
break;
case IVL_LO_NAND:
ltype = "NAND";
lcasc = "AND";
identity_val = '1';
break;
case IVL_LO_NOR:
ltype = "NOR";
lcasc = "OR";
break;
case IVL_LO_NOT:
ltype = "NOT";
break;
case IVL_LO_OR:
ltype = "OR";
break;
case IVL_LO_XNOR:
ltype = "XNOR";
lcasc = "XOR";
break;
case IVL_LO_XOR:
ltype = "XOR";
break;
case IVL_LO_EEQ:
ltype = "EEQ";
break;
case IVL_LO_PMOS:
ltype = "PMOS";
break;
case IVL_LO_NMOS:
ltype = "NMOS";
break;
case IVL_LO_RPMOS:
ltype = "RPMOS";
break;
case IVL_LO_RNMOS:
ltype = "RNMOS";
break;
case IVL_LO_NOTIF0:
ltype = "NOTIF0";
break;
case IVL_LO_NOTIF1:
ltype = "NOTIF1";
break;
default:
fprintf(stderr, "vvp.tgt: error: Unhandled logic type: %u\n",
ivl_logic_type(lptr));
ltype = "?";
break;
}
{ ivl_nexus_t nex = ivl_logic_pin(lptr, 0);
ivl_nexus_ptr_t nptr = 0;
unsigned idx;
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
nptr = ivl_nexus_ptr(nex,idx);
if (ivl_nexus_ptr_log(nptr) != lptr)
continue;
if (ivl_nexus_ptr_pin(nptr) != 0)
continue;
break;
}
str0 = ivl_nexus_ptr_drive0(nptr);
str1 = ivl_nexus_ptr_drive1(nptr);
}
if (!lcasc)
lcasc = ltype;
/* Get all the input label that I will use for parameters to
the functor that I create later. */
ninp = ivl_logic_pins(lptr) - 1;
input_strings = calloc(ninp, sizeof(char*));
for (pdx = 0 ; pdx < ninp ; pdx += 1)
input_strings[pdx] = draw_net_input(ivl_logic_pin(lptr, pdx+1));
level = 0;
ninp = ivl_logic_pins(lptr) - 1;
while (ninp) {
int inst;
for (inst = 0; inst < ninp; inst += 4) {
if (ninp > 4)
fprintf(vvp_out, "L_%s/%d/%d .functor %s",
vvp_mangle_id(ivl_logic_name(lptr)),
level, inst,
lcasc);
else {
fprintf(vvp_out, "L_%s .functor %s",
vvp_mangle_id(ivl_logic_name(lptr)),
ltype);
draw_delay(lptr);
if (str0 != IVL_DR_STRONG || str1 != IVL_DR_STRONG)
fprintf(vvp_out, " [%u %u]", str0, str1);
}
for (pdx = inst; pdx < ninp && pdx < inst+4 ; pdx += 1) {
if (level) {
fprintf(vvp_out, ", L_%s/%d/%d",
vvp_mangle_id(ivl_logic_name(lptr)),
level - 1,
pdx*4 );
} else {
fprintf(vvp_out, ", %s", input_strings[pdx]);
}
}
for ( ; pdx < inst+4 ; pdx += 1) {
fprintf(vvp_out, ", C<%c>", identity_val);
}
fprintf(vvp_out, ";\n");
}
if (ninp > 4)
ninp = (ninp+3) / 4;
else
ninp = 0;
level += 1;
}
/* Free the array of char*. The strings themselves are
persistent, held by the ivl_nexus_t objects. */
free(input_strings);
}
static void draw_event_in_scope(ivl_event_t obj)
{
unsigned nany = ivl_event_nany(obj);
unsigned nneg = ivl_event_nneg(obj);
unsigned npos = ivl_event_npos(obj);
unsigned cnt = 0;
/* Figure out how many probe functors are needed. */
if (nany > 0)
cnt += (nany+3) / 4;
if (nneg > 0)
cnt += (nneg+3) / 4;
if (npos > 0)
cnt += (npos+3) / 4;
if (cnt == 0) {
/* If none are needed, then this is a named event. The
code needed is easy. */
fprintf(vvp_out, "E_%s .event \"%s\";\n",
vvp_mangle_id(ivl_event_name(obj)),
vvp_mangle_name(ivl_event_basename(obj)));
} else if (cnt > 1) {
unsigned idx;
unsigned ecnt = 0;
for (idx = 0 ; idx < nany ; idx += 4, ecnt += 1) {
unsigned sub, top;
fprintf(vvp_out, "E_%s/%u .event edge",
vvp_mangle_id(ivl_event_name(obj)), ecnt);
top = idx + 4;
if (nany < top)
top = nany;
for (sub = idx ; sub < top ; sub += 1) {
ivl_nexus_t nex = ivl_event_any(obj, sub);
fprintf(vvp_out, ", ");
draw_input_from_net(nex);
}
fprintf(vvp_out, ";\n");
}
for (idx = 0 ; idx < nneg ; idx += 4, ecnt += 1) {
unsigned sub, top;
fprintf(vvp_out, "E_%s/%u .event negedge",
vvp_mangle_id(ivl_event_name(obj)), ecnt);
top = idx + 4;
if (nneg < top)
top = nneg;
for (sub = idx ; sub < top ; sub += 1) {
ivl_nexus_t nex = ivl_event_neg(obj, sub);
fprintf(vvp_out, ", ");
draw_input_from_net(nex);
}
fprintf(vvp_out, ";\n");
}
for (idx = 0 ; idx < npos ; idx += 4, ecnt += 1) {
unsigned sub, top;
fprintf(vvp_out, "E_%s/%u .event posedge",
vvp_mangle_id(ivl_event_name(obj)), ecnt);
top = idx + 4;
if (npos < top)
top = npos;
for (sub = idx ; sub < top ; sub += 1) {
ivl_nexus_t nex = ivl_event_pos(obj, sub);
fprintf(vvp_out, ", ");
draw_input_from_net(nex);
}
fprintf(vvp_out, ";\n");
}
assert(ecnt == cnt);
fprintf(vvp_out, "E_%s .event/or",
vvp_mangle_id(ivl_event_name(obj)));
fprintf(vvp_out, " E_%s/0",
vvp_mangle_id(ivl_event_name(obj)));
for (idx = 1 ; idx < cnt ; idx += 1)
fprintf(vvp_out, ", E_%s/%u",
vvp_mangle_id(ivl_event_name(obj)), idx);
fprintf(vvp_out, ";\n");
} else {
unsigned idx;
fprintf(vvp_out, "E_%s .event ",
vvp_mangle_id(ivl_event_name(obj)));
if (nany > 0) {
assert((nneg + npos) == 0);