/
ivl_target.h
1290 lines (1202 loc) · 46.9 KB
/
ivl_target.h
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
#ifndef __ivl_target_H
#define __ivl_target_H
/*
* Copyright (c) 2000-2003 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: ivl_target.h,v 1.124 2003/12/03 02:46:24 steve Exp $"
#endif
#ifdef __cplusplus
#define _BEGIN_DECL extern "C" {
#define _END_DECL }
#else
#define _BEGIN_DECL
#define _END_DECL
#endif
_BEGIN_DECL
/*
* This header file describes the API for the loadable target
* module. The main program can load these modules and access the
* functions within the loaded module to implement the backend
* behavior.
*
* The interface is divided into two parts: the entry points within
* the core that are called by the module, and the entry points in
* the module that are called by the core. It is the latter that
* causes the module to be invoked in the first place, but most of the
* interesting information about the design is accessed through the
* various access functions that the modules calls into the core.
*/
/*
* In order to grab onto data in the design, the core passes cookies
* to the various functions of the module. These cookies can in turn
* be passed to access functions in the core to get more detailed
* information.
*
* The following typedefs list the various cookies that may be passed
* around.
*
* ivl_design_t
* This object represents the entire elaborated design. Various
* global properties and methods are available from this.
*
* ivl_event_t
* This object represents an event node. An event node stands for
* named events written explicitly in the Verilog, and net events
* that are implicit when @ statements are used.
*
* ivl_expr_t
* This object represents a node of an expression. If the
* expression has sub-expressions, they can be accessed from
* various method described below. The ivl_expr_type method in
* particular gets the type of the node in the form of an
* ivl_expr_type_t enumeration value.
*
* Objects of this type represent expressions in
* processes. Structural expressions are instead treated as logic
* gates.
*
* ivl_lpm_t
* This object is the base class for all the various LPM type
* device nodes. This object carries a few base properties
* (including a type) including a handle to the specific type.
*
* ivl_net_logic_t
* This object represents various built in logic devices. In fact,
* this includes just about every directional device that has a
* single output, including logic gates and nmos, pmos and cmos
* devices. There is also the occasional Icarus Verilog creation.
*
* ivl_nexus_t
* Structural links within an elaborated design are connected
* together at each bit. The connection point is a nexus, so pins
* of devices refer to an ivl_nexus_t. Furthermore, from a nexus
* there are backward references to all the device pins that point
* to it.
*
* ivl_parameter_t
* Scopes have zero or more parameter objects that represent
* parameters that the source defined. The parameter has a value
* that is fully elaborated, with defparams and other parameter
* overrides taken care of.
*
* ivl_process_t
* A Verilog process is represented by one of these. A process may
* be an "initial" or an "always" process. These come from initial
* or always statements from the Verilog source.
*
* ivl_scope_t
* Elaborated scopes within a design are represented by this
* type. Objects of this type also act as containers for scoped
* objects such as signals.
*
* ivl_statement_t
* Statements within processes are represented by one of these. The
* ivl_process_t object holds one of these, but a statement may in
* turn contain other statements.
*
* -- A Note About Bit Sets --
* Some objects hold a value as an array of bits. In these cases there
* is some method that retrieves the width of the value and another
* that returns a "char*". The latter is a pointer to the least
* significant bit value. Bit values are represented by the characters
* '0', '1', 'x' and 'z'. Strengths are stored elsewhere.
*
* -- A Note About Names --
* The names of objects are complete, hierarchical names. That is,
* they include the instance name of the module that contains them.
*
* basenames are the name of the object without the containing
* scope. These names are unique within a scope, but not necessarily
* throughout the design.
*/
typedef struct ivl_design_s *ivl_design_t;
typedef struct ivl_event_s *ivl_event_t;
typedef struct ivl_expr_s *ivl_expr_t;
typedef struct ivl_lpm_s *ivl_lpm_t;
typedef struct ivl_lval_s *ivl_lval_t;
typedef struct ivl_net_const_s*ivl_net_const_t;
typedef struct ivl_net_logic_s*ivl_net_logic_t;
typedef struct ivl_udp_s *ivl_udp_t;
typedef struct ivl_net_probe_s*ivl_net_probe_t;
typedef struct ivl_nexus_s *ivl_nexus_t;
typedef struct ivl_nexus_ptr_s*ivl_nexus_ptr_t;
typedef struct ivl_parameter_s*ivl_parameter_t;
typedef struct ivl_process_s *ivl_process_t;
typedef struct ivl_scope_s *ivl_scope_t;
typedef struct ivl_signal_s *ivl_signal_t;
typedef struct ivl_memory_s *ivl_memory_t;
typedef struct ivl_statement_s*ivl_statement_t;
typedef struct ivl_variable_s *ivl_variable_t;
/*
* These are types that are defined as enumerations. These have
* explicit values so that the binary API is a bit more resilient to
* changes and additions to the enumerations.
*/
typedef enum ivl_drive_e {
IVL_DR_HiZ = 0,
IVL_DR_SMALL = 1,
IVL_DR_MEDIUM = 2,
IVL_DR_WEAK = 3,
IVL_DR_LARGE = 4,
IVL_DR_PULL = 5,
IVL_DR_STRONG = 6,
IVL_DR_SUPPLY = 7
} ivl_drive_t;
/* This is the type of an ivl_expr_t object. The explicit numbers
allow additions to the enumeration without causing values to shift
and incompatibilities to be introduced. */
typedef enum ivl_expr_type_e {
IVL_EX_NONE = 0,
IVL_EX_BITSEL = 1,
IVL_EX_BINARY = 2,
IVL_EX_CONCAT = 3,
IVL_EX_EVENT = 17,
IVL_EX_MEMORY = 4,
IVL_EX_NUMBER = 5,
IVL_EX_SCOPE = 6,
IVL_EX_SELECT = 7,
IVL_EX_SFUNC = 8,
IVL_EX_SIGNAL = 9,
IVL_EX_STRING = 10,
IVL_EX_TERNARY = 11,
IVL_EX_UFUNC = 12,
IVL_EX_ULONG = 13,
IVL_EX_UNARY = 14,
IVL_EX_VARIABLE = 15,
IVL_EX_REALNUM = 16
} ivl_expr_type_t;
/* This is the type code for an ivl_net_logic_t object. */
typedef enum ivl_logic_e {
IVL_LO_NONE = 0,
IVL_LO_AND = 1,
IVL_LO_BUF = 2,
IVL_LO_BUFIF0 = 3,
IVL_LO_BUFIF1 = 4,
IVL_LO_BUFZ = 5,
IVL_LO_NAND = 6,
IVL_LO_NMOS = 7,
IVL_LO_NOR = 8,
IVL_LO_NOT = 9,
IVL_LO_NOTIF0 = 10,
IVL_LO_NOTIF1 = 11,
IVL_LO_OR = 12,
IVL_LO_PULLDOWN = 13,
IVL_LO_PULLUP = 14,
IVL_LO_RNMOS = 15,
IVL_LO_RPMOS = 16,
IVL_LO_PMOS = 17,
IVL_LO_XNOR = 18,
IVL_LO_XOR = 19,
IVL_LO_EEQ = 20,
IVL_LO_UDP = 21
} ivl_logic_t;
/* This is the type of an LPM object. */
typedef enum ivl_lpm_type_e {
IVL_LPM_ADD = 0,
IVL_LPM_CMP_EQ = 10,
IVL_LPM_CMP_GE = 1,
IVL_LPM_CMP_GT = 2,
IVL_LPM_CMP_NE = 11,
IVL_LPM_DIVIDE = 12,
IVL_LPM_FF = 3,
IVL_LPM_MOD = 13,
IVL_LPM_MULT = 4,
IVL_LPM_MUX = 5,
IVL_LPM_SHIFTL = 6,
IVL_LPM_SHIFTR = 7,
IVL_LPM_SUB = 8,
IVL_LPM_RAM = 9,
IVL_LPM_UFUNC = 14
} ivl_lpm_type_t;
/* Processes are initial or always blocks with a statement. This is
the type of the ivl_process_t object. */
typedef enum ivl_process_type_e {
IVL_PR_INITIAL = 0,
IVL_PR_ALWAYS = 1
} ivl_process_type_t;
/* These are the sorts of reasons a scope may come to be. These types
are properties of ivl_scope_t objects. */
typedef enum ivl_scope_type_e {
IVL_SCT_MODULE = 0,
IVL_SCT_FUNCTION= 1,
IVL_SCT_TASK = 2,
IVL_SCT_BEGIN = 3,
IVL_SCT_FORK = 4
} ivl_scope_type_t;
/* Signals (ivl_signal_t) that are ports into the scope that contains
them have a port type. Otherwise, they are port IVL_SIP_NONE. */
typedef enum ivl_signal_port_e {
IVL_SIP_NONE = 0,
IVL_SIP_INPUT = 1,
IVL_SIP_OUTPUT= 2,
IVL_SIP_INOUT = 3
} ivl_signal_port_t;
/* This is the type code for an ivl_signal_t object. Implicit types
are resolved by the core compiler, and integers are converted into
signed registers. */
typedef enum ivl_signal_type_e {
IVL_SIT_NONE = 0,
IVL_SIT_REG,
IVL_SIT_SUPPLY0,
IVL_SIT_SUPPLY1,
IVL_SIT_TRI,
IVL_SIT_TRI0,
IVL_SIT_TRI1,
IVL_SIT_TRIAND,
IVL_SIT_TRIOR
} ivl_signal_type_t;
/* This is the type code for ivl_statement_t objects. */
typedef enum ivl_statement_type_e {
IVL_ST_NONE = 0,
IVL_ST_NOOP = 1,
IVL_ST_ASSIGN = 2,
IVL_ST_ASSIGN_NB = 3,
IVL_ST_BLOCK = 4,
IVL_ST_CASE = 5,
IVL_ST_CASER = 24, /* Case statement with real expressions. */
IVL_ST_CASEX = 6,
IVL_ST_CASEZ = 7,
IVL_ST_CASSIGN = 8,
IVL_ST_CONDIT = 9,
IVL_ST_DEASSIGN = 10,
IVL_ST_DELAY = 11,
IVL_ST_DELAYX = 12,
IVL_ST_DISABLE = 13,
IVL_ST_FORCE = 14,
IVL_ST_FOREVER = 15,
IVL_ST_FORK = 16,
IVL_ST_RELEASE = 17,
IVL_ST_REPEAT = 18,
IVL_ST_STASK = 19,
IVL_ST_TRIGGER = 20,
IVL_ST_UTASK = 21,
IVL_ST_WAIT = 22,
IVL_ST_WHILE = 23
} ivl_statement_type_t;
/* This is the type of a variable, and also used as the type for an
expression. */
typedef enum ivl_variable_type_e {
IVL_VT_VOID = 0, /* Not used */
IVL_VT_REAL,
IVL_VT_VECTOR
} ivl_variable_type_t;
/* This is the type of the function to apply to a process. */
typedef int (*ivl_process_f)(ivl_process_t net, void*cd);
/* This is the type of a function to apply to a scope. The ivl_scope_t
parameter is the scope, and the cd parameter is client data that
the user passes to the scanner. */
typedef int (ivl_scope_f)(ivl_scope_t net, void*cd);
/* Attributes, which can be attached to various object types, have
this form. */
typedef enum ivl_attribute_type_e {
IVL_ATT_VOID = 0,
IVL_ATT_STR,
IVL_ATT_NUM
} ivl_attribute_type_t;
struct ivl_attribute_s {
const char*key;
ivl_attribute_type_t type;
union val_ {
const char*str;
long num;
} val;
};
typedef const struct ivl_attribute_s*ivl_attribute_t;
/* DESIGN
* When handed a design (ivl_design_t) there are a few things that you
* can do with it. The Verilog program has one design that carries the
* entire program. Use the design methods to iterate over the elements
* of the design.
*
* ivl_design_flag
* This function returns the string value of a named flag. Flags
* come from the "-fkey=value" options to the iverilog command and
* are stored in a map for this function. Given the key, this
* function returns the value.
*
* The special key "-o" is the argument to the -o flag of the
* command line (or the default if the -o flag is not used) and is
* generally how the target learns the name of the output file.
*
* ivl_design_process
* This function scans the processes (threads) in the design. It
* calls the user supplied function on each of the processes until
* one of the functors returns non-0 or all the processes are
* scanned. This function will return 0, or the non-zero value that
* was returned from the last scanned process.
*
* ivl_design_root
* A design has a root named scope that is an instance of the top
* level module in the design. This is a hook for naming the
* design, or for starting the scope scan.
*
* ivl_design_time_precision
* A design as a time precision. This is the size in seconds (a
* signed power of 10) of a simulation tick.
*/
extern const char* ivl_design_flag(ivl_design_t des, const char*key);
extern int ivl_design_process(ivl_design_t des,
ivl_process_f fun, void*cd);
extern ivl_scope_t ivl_design_root(ivl_design_t des);
extern void ivl_design_roots(ivl_design_t des,
ivl_scope_t **scopes,
unsigned int *nscopes);
extern int ivl_design_time_precision(ivl_design_t des);
extern unsigned ivl_design_consts(ivl_design_t des);
extern ivl_net_const_t ivl_design_const(ivl_design_t, unsigned idx);
/*
* These methods apply to ivl_net_const_t objects.
*/
extern const char* ivl_const_bits(ivl_net_const_t net);
extern ivl_nexus_t ivl_const_pin(ivl_net_const_t net, unsigned idx);
extern unsigned ivl_const_pins(ivl_net_const_t net);
extern int ivl_const_signed(ivl_net_const_t net);
/* EVENTS
*
* Events are a unification of named events and implicit events
* generated by the @ statements.
*
* ivl_event_name (Obsolete)
* ivl_event_basename
* Return the name of the event. The basename is the name within
* the scope, as declared by the user.
*
* ivl_event_edge
* Return the edge type for the event. If this is a named event
* that has no network input, then the edge is IVL_EDGE_NONE.
*/
extern const char* ivl_event_name(ivl_event_t net);
extern const char* ivl_event_basename(ivl_event_t net);
extern unsigned ivl_event_nany(ivl_event_t net);
extern ivl_nexus_t ivl_event_any(ivl_event_t net, unsigned idx);
extern unsigned ivl_event_nneg(ivl_event_t net);
extern ivl_nexus_t ivl_event_neg(ivl_event_t net, unsigned idx);
extern unsigned ivl_event_npos(ivl_event_t net);
extern ivl_nexus_t ivl_event_pos(ivl_event_t net, unsigned idx);
/* EXPRESSIONS
*
* These methods operate on expression objects from the
* design. Expressions mainly exist in behavioral code. The
* ivl_expr_type() function returns the type of the expression node,
* and the remaining functions access value bits of the expression.
*
* ivl_expr_signed
* This method returns true (!= 0) if the expression node
* represents a signed expression. It is possible for sub-
* expressions to be unsigned even if a node is signed, but the
* IVL core figures all this out for you. At any rate, this method
* can be applied to any expression node.
*
* ivl_expr_type
* Get the type of the expression node. Every expression node has a
* type, which can affect how some of the other expression methods
* operate on the node
*
* ivl_expr_value
* Get the data type of the expression node. This uses the variable
* type enum to express the type of the expression node.
*
* ivl_expr_width
* This method returns the bit width of the expression at this
* node. It can be applied to any expression node, and returns the
* *output* width of the expression node.
*
* ivl_expr_parameter
* This function returns the ivl_parameter_t object that represents
* this object, or 0 (nil) if it is not a parameter value. This
* function allows the code generator to detect the case where the
* expression is a parameter. This will normally only return a
* non-nil value for constants.
*
* ivl_expr_opcode
* IVL_EX_BINARY and IVL_EX_UNARY expression nodes include an
* opcode from this table:
* & -- AND
* A -- NAND (~&)
* X -- XNOR (~^)
*/
extern ivl_expr_type_t ivl_expr_type(ivl_expr_t net);
extern ivl_variable_type_t ivl_expr_value(ivl_expr_t net);
/* IVL_EX_NUMBER */
extern const char* ivl_expr_bits(ivl_expr_t net);
/* IVL_EX_UFUNC */
extern ivl_scope_t ivl_expr_def(ivl_expr_t net);
/* IVL_EX_REALNUM */
extern double ivl_expr_dvalue(ivl_expr_t net);
/* IVL_EX_SIGNAL */
extern unsigned ivl_expr_lsi(ivl_expr_t net);
/* IVL_EX_SIGNAL, IVL_EX_SFUNC, IVL_EX_VARIABLE */
extern const char* ivl_expr_name(ivl_expr_t net);
/* IVL_EX_BINARY IVL_EX_UNARY */
extern char ivl_expr_opcode(ivl_expr_t net);
/* IVL_EX_BINARY IVL_EX_BITSEL IVL_EX_UNARY, IVL_EX_MEMORY IVL_EX_TERNARY */
extern ivl_expr_t ivl_expr_oper1(ivl_expr_t net);
/* IVL_EX_BINARY IVL_EX_TERNARY */
extern ivl_expr_t ivl_expr_oper2(ivl_expr_t net);
/* IVL_EX_TERNARY */
extern ivl_expr_t ivl_expr_oper3(ivl_expr_t net);
/* and expression */
extern ivl_parameter_t ivl_expr_parameter(ivl_expr_t net);
/* IVL_EX_CONCAT IVL_EX_UFUNC */
extern ivl_expr_t ivl_expr_parm(ivl_expr_t net, unsigned idx);
/* IVL_EX_CONCAT IVL_EX_SFUNC IVL_EX_UFUNC */
extern unsigned ivl_expr_parms(ivl_expr_t net);
/* IVL_EX_CONCAT */
extern unsigned ivl_expr_repeat(ivl_expr_t net);
/* IVL_EX_EVENT */
extern ivl_event_t ivl_expr_event(ivl_expr_t net);
/* IVL_EX_SCOPE */
extern ivl_scope_t ivl_expr_scope(ivl_expr_t net);
/* IVL_EX_BITSEL */
extern ivl_signal_t ivl_expr_signal(ivl_expr_t net);
/* any expression */
extern int ivl_expr_signed(ivl_expr_t net);
/* IVL_EX_STRING */
extern const char* ivl_expr_string(ivl_expr_t net);
/* IVL_EX_ULONG */
extern unsigned long ivl_expr_uvalue(ivl_expr_t net);
/* IVL_EX_VARIABLE */
extern ivl_variable_t ivl_expr_variable(ivl_expr_t net);
/* any expression */
extern unsigned ivl_expr_width(ivl_expr_t net);
/*
* Memory.
*
* ivl_memory_name (DEPRECATED)
*
* ivl_memory_basename
* This returns the base name of the memory object. The base name
* does not include the name of the scopes that contains the object.
*
* ivl_memory_size
* ivl_memory_width
* These functions return the dimensions of the memory. The size is
* the number of words in the memory, and the width is the number
* of bits in each word.
*
* ivl_memory_scope
* This returns the scope that contains the memory.
*/
extern const char*ivl_memory_basename(ivl_memory_t net);
extern int ivl_memory_root(ivl_memory_t net);
extern ivl_scope_t ivl_memory_scope(ivl_memory_t net);
extern unsigned ivl_memory_size(ivl_memory_t net);
extern unsigned ivl_memory_width(ivl_memory_t net);
extern ivl_memory_t ivl_expr_memory(ivl_expr_t net);
/* LOGIC
* These types and functions support manipulation of logic gates. The
* ivl_logic_t enumeration identifies the various kinds of gates that
* the ivl_net_logic_t can represent. The various functions then
* provide access to the bits of information for a given logic device.
*
* ivl_logic_type
* This method returns the type of logic gate that the cookie
* represents.
*
* ivl_logic_name (obsolete)
* This method returns the complete name of the logic gate. Every
* gate has a complete name (that includes the scope) even if the
* Verilog source doesn't include one. The compiler will choose one
* if necessary.
*
* ivl_logic_basename
* This is the name of the gate without the scope part.
*
* ivl_logic_scope
* This is the scope that directly contains the logic device.
*
* ivl_logic_pins
* ivl_logic_pin
*
* ivl_logic_attr (obsolete)
* Return the value of a specific attribute, given the key name as
* a string. If the key is not defined, then return 0 (null).
*
* ivl_logic_attr_cnt
* ivl_logic_attr_val
* These support iterating over logic attributes. The _cnt method
* returns the number of attributes attached to the gate, and the
* ivl_logic_attr_val returns the value of the attribute.
*/
extern const char* ivl_logic_name(ivl_net_logic_t net);
extern const char* ivl_logic_basename(ivl_net_logic_t net);
extern ivl_scope_t ivl_logic_scope(ivl_net_logic_t net);
extern ivl_logic_t ivl_logic_type(ivl_net_logic_t net);
extern ivl_nexus_t ivl_logic_pin(ivl_net_logic_t net, unsigned pin);
extern unsigned ivl_logic_pins(ivl_net_logic_t net);
extern ivl_udp_t ivl_logic_udp(ivl_net_logic_t net);
extern unsigned ivl_logic_delay(ivl_net_logic_t net, unsigned transition);
/* DEPRECATED */
extern const char* ivl_logic_attr(ivl_net_logic_t net, const char*key);
extern unsigned ivl_logic_attr_cnt(ivl_net_logic_t net);
extern ivl_attribute_t ivl_logic_attr_val(ivl_net_logic_t net, unsigned idx);
/* UDP
*
*/
extern unsigned ivl_udp_sequ(ivl_udp_t net);
extern unsigned ivl_udp_nin(ivl_udp_t net);
extern unsigned ivl_udp_init(ivl_udp_t net);
extern const char* ivl_udp_row(ivl_udp_t net, unsigned idx);
extern unsigned ivl_udp_rows(ivl_udp_t net);
extern const char* ivl_udp_name(ivl_udp_t net);
/* LPM
* These functions support access to the properties of LPM
* devices. LPM devices are a variety of devices that handle more
* complex structural semantics.
*
* These are the functions that apply to all LPM devices:
*
* ivl_lpm_name (Obsolete)
* ivl_lpm_basename
* Return the name of the device. The name is the name of the
* device with the scope part, and the basename is without the scope.
*
* ivl_lpm_scope
* LPM devices exist within a scope. Return the scope that contains
* this device.
*
* ivl_lpm_type
* Return the ivl_lpm_type_t of the specific LPM device.
*
* ivl_lpm_width
* Return the width of the LPM device. What this means depends on
* the LPM type, but it generally has to do with the width of the
* output data path.
*
*
* These functions apply to a subset of the LPM devices, or may have
* varying meaning depending on the device:
*
* ivl_lpm_data
* Return the input data nexus for device types that have a single
* input vector. This is also used to the get nexa of the first
* vector for devices that have more inputs.
*
* ivl_lpm_datab
* Return the input data nexus for device types that have a second
* input vector. For example, arithmetic devices are like this.
*
* ivl_lpm_q
* Return the output data nexus for device types that have a single
* output vector. This is most devices, it turns out.
*
* ivl_lpm_selects
* This is the size of the select input for a LPM_MUX device, or the
* address bus width of an LPM_RAM.
*
* ivl_lpm_signed
* Arithmetic LPM devices may be signed or unsigned if there is a
* distinction.
*
* ivl_lpm_size
* In addition to a width, some devices have a size. The size is
* often the number of inputs per out, i.e., the number of inputs
* per bit for a MUX.
*/
extern const char* ivl_lpm_name(ivl_lpm_t net); /* (Obsolete) */
extern const char* ivl_lpm_basename(ivl_lpm_t net);
extern ivl_scope_t ivl_lpm_scope(ivl_lpm_t net);
extern int ivl_lpm_signed(ivl_lpm_t net);
extern ivl_lpm_type_t ivl_lpm_type(ivl_lpm_t net);
extern unsigned ivl_lpm_width(ivl_lpm_t net);
/* IVL_LPM_FF */
extern ivl_nexus_t ivl_lpm_async_clr(ivl_lpm_t net);
extern ivl_nexus_t ivl_lpm_async_set(ivl_lpm_t net);
extern ivl_expr_t ivl_lpm_aset_value(ivl_lpm_t net);
extern ivl_nexus_t ivl_lpm_sync_clr(ivl_lpm_t net);
extern ivl_nexus_t ivl_lpm_sync_set(ivl_lpm_t net);
extern ivl_expr_t ivl_lpm_sset_value(ivl_lpm_t net);
/* IVL_LPM_FF IVL_LPM_RAM */
extern ivl_nexus_t ivl_lpm_clk(ivl_lpm_t net);
/* IVL_LPM_UFUNC */
extern ivl_scope_t ivl_lpm_define(ivl_lpm_t net);
/* IVL_LPM_FF IVL_LPM_RAM */
extern ivl_nexus_t ivl_lpm_enable(ivl_lpm_t net);
/* IVL_LPM_ADD IVL_LPM_FF IVL_LPM_MULT IVL_LPM_RAM IVL_LPM_SUB */
extern ivl_nexus_t ivl_lpm_data(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_ADD IVL_LPM_MULT IVL_LPM_SUB */
/* IVL_LPM_MUX IVL_LPM_UFUNC */
extern ivl_nexus_t ivl_lpm_datab(ivl_lpm_t net, unsigned idx);
extern ivl_nexus_t ivl_lpm_data2(ivl_lpm_t net, unsigned sdx, unsigned idx);
/* IVL_LPM_UFUNC */
extern unsigned ivl_lpm_data2_width(ivl_lpm_t net, unsigned sdx);
/* IVL_LPM_ADD IVL_LPM_FF IVL_LPM_MULT IVL_LPM_RAM IVL_LPM_SUB
IVL_LPM_UFUNC */
extern ivl_nexus_t ivl_lpm_q(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_MUX IVL_LPM_RAM */
extern unsigned ivl_lpm_selects(ivl_lpm_t net);
/* IVL_LPM_MUX IVL_LPM_RAM */
extern ivl_nexus_t ivl_lpm_select(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_MUX */
extern unsigned ivl_lpm_size(ivl_lpm_t net);
/* IVL_LPM_RAM */
extern ivl_memory_t ivl_lpm_memory(ivl_lpm_t net);
/* LVAL
* The l-values of assignments are concatenation of ivl_lval_t
* objects. Each lvi_lval_t object is an assignment to a var or a
* memory, through a bit select, part select or word select.
*
* Var lvals are things like assignments to a part select or a bit
* select. Assignment to the whole variable is a special case of a
* part select, as is a bit select with a constant expression. The
* ivl_lval_pins statement returns the width of the part select for
* the lval. The ivl_lval_pin function returns the nexus to the N-th
* bit of the part select. The compiler takes care of positioning the
* part select so that ivl_lval_pin(net, 0) is the proper bit in the
* signal.
*
* ivl_lval_mux
* If the l-value includes a bit select expression, this method
* returns an ivl_expr_t that represents that
* expression. Otherwise, it returns 0.
*
* ivl_lval_mem
* If the l-value is a memory, this method returns an
* ivl_memory_t that represents that memory. Otherwise, it
* returns 0.
*
* ivl_lval_sig
* If the l-value is a variable, this method returns the signal
* object that is the target of the assign.
*
* ivl_lval_var
* If the l-value is a non-signal variable (i.e. a real) this
* method returns the ivl_variable_t object that represents it.
* If the lval is this sort of variable, then the part_off, idx and
* pin methods do not apply.
*
* ivl_lval_part_off
* The part select of the signal is based here. This is the
* canonical index of bit-0 of the part select.
*
* ivl_lval_idx
* If the l-value is a memory, this method returns an
* ivl_expr_t that represents the index expression. Otherwise, it
* returns 0.
*
* ivl_lval_pin
* Return an ivl_nexus_t for the connection of the ivl_lval_t.
*
* ivl_lval_pins
* Return the number of pins for this object.
*/
extern ivl_expr_t ivl_lval_mux(ivl_lval_t net);
extern ivl_expr_t ivl_lval_idx(ivl_lval_t net);
extern ivl_memory_t ivl_lval_mem(ivl_lval_t net);
extern ivl_variable_t ivl_lval_var(ivl_lval_t net);
extern unsigned ivl_lval_part_off(ivl_lval_t net);
extern unsigned ivl_lval_pins(ivl_lval_t net);
extern ivl_nexus_t ivl_lval_pin(ivl_lval_t net, unsigned idx);
extern ivl_signal_t ivl_lval_sig(ivl_lval_t net);
/* NEXUS
* connections of signals and nodes is handled by single-bit
* nexus. These functions manage the ivl_nexus_t object. They also
* manage the ivl_nexus_ptr_t objects that are closely related to the
* nexus.
*
* ivl_nexus_name
* Each nexus is given a name, typically derived from the signals
* connected to it, but completely made up if need be. The name of
* every nexus is unique.
*
* ivl_nexus_ptrs
* This function returns the number of pointers that are held by
* the nexus. It should always return at least 1. The pointer
* proper is accessed by index.
*
* ivl_nexus_ptr
* Return a nexus pointer given the nexus and an index.
*
* ivl_nexus_set_private
* ivl_nexus_get_private
* The target module often needs to associate data with a nexus for
* later use when the nexus is encountered associated with a
* device. These methods allow the code generator to store to or
* retrieve from a nexus a void* of private data. This pointer is
* guaranteed to be 0 before the target module is invoked.
*
* Once an ivl_nexus_ptr_t is selected by the ivl_nexus_ptr method,
* the properties of the pointer can be accessed by the following
* methods:
*
* ivl_nexus_ptr_pin
* This returns the pin number of the device where this nexus
* points. It is the bit within the signal or logic device that is
* connected to the nexus.
*
* If the target is an LPM device, then this value is zero, and it
* is up to the application to find the pin that refers to this
* nexus. The problem is that LPM devices do not have a pinout per
* se, the pins all have specific names.
*
* ivl_nexus_ptr_con
* If this is a pointer to a magic constant device, then this
* returns the net_const object.
*
* ivl_nexus_ptr_drive0
* ivl_nexus_ptr_drive1
* These are the 0 and 1 strength values for the devices. For most
* devices, these values are fixed by the description in the
* original source, with the default as IVL_DR_STRONG. For pins
* that are input only, drive0 and drive1 are both IVL_DR_HiZ.
*
* The strength of strength-aware devices (such as nmos devices)
* does not really matter, as long at the output is not
* IVL_DR_HiZ. Testing for HiZ drivers is how code generators
* detect inputs.
*
* ivl_nexus_ptr_log
* If the target object is an ivl_net_logic_t, this method returns
* the object. Otherwise, this method returns 0.
*
* ivl_nexus_ptr_lpm
* If the target object is an ivl_lpm_t, this method returns the
* object. Otherwise, this method returns 0.
*
* ivl_nexus_ptr_sig
* If the target object is an ivl_signal_t, this method returns the
* object. If the target is not a signal, this method returns 0.
*/
extern const char* ivl_nexus_name(ivl_nexus_t net);
extern unsigned ivl_nexus_ptrs(ivl_nexus_t net);
extern ivl_nexus_ptr_t ivl_nexus_ptr(ivl_nexus_t net, unsigned idx);
extern void ivl_nexus_set_private(ivl_nexus_t net, void*data);
extern void* ivl_nexus_get_private(ivl_nexus_t net);
extern ivl_drive_t ivl_nexus_ptr_drive0(ivl_nexus_ptr_t net);
extern ivl_drive_t ivl_nexus_ptr_drive1(ivl_nexus_ptr_t net);
extern unsigned ivl_nexus_ptr_pin(ivl_nexus_ptr_t net);
extern ivl_net_const_t ivl_nexus_ptr_con(ivl_nexus_ptr_t net);
extern ivl_net_logic_t ivl_nexus_ptr_log(ivl_nexus_ptr_t net);
extern ivl_lpm_t ivl_nexus_ptr_lpm(ivl_nexus_ptr_t net);
extern ivl_signal_t ivl_nexus_ptr_sig(ivl_nexus_ptr_t net);
/* PARAMETER
* Parameters are named constants associated with a scope. The user
* may set in the Verilog source the value of parameters, and that
* leads to ivl_parameter_t objects contained in the ivl_scope_t
* objects.
*
* Parameters are essentially named constants. These constant values
* can be accessed by looking at the scope (using ivl_scope_param) or
* they can be discovered when they are used, via the
* ivl_expr_parameter function. The fact that a constant has a name
* (i.e. is a parameter) does not otherwise impose on the value or
* interpretation of the constant expression so far as ivl_target is
* concerned. The target may need this information, or may choose to
* completely ignore it.
*
* ivl_parameter_basename
* return the name of the parameter.
*
* ivl_parameter_scope
* Return the scope of the parameter. The parameter name is only
* unique within its scope.
*
* ivl_parameter_expr
* Return the value of the parameter. This should be a simple
* constant expression, an IVL_EX_STRING or IVL_EX_NUMBER.
*/
extern const char* ivl_parameter_basename(ivl_parameter_t net);
extern ivl_scope_t ivl_parameter_scope(ivl_parameter_t net);
extern ivl_expr_t ivl_parameter_expr(ivl_parameter_t net);
/* SCOPE
* Scopes of various sort have these properties. Use these methods to
* access them. Scopes come to exist in the elaborated design
* generally when a module is instantiated, though they also come from
* named blocks, tasks and functions.
*
* - module instances (IVL_SCT_MODULE)
* A module instance scope may contain events, logic gates, lpm
* nodes, signals, and possibly children. The children are further
* instances, or function/task scopes. Module instances do *not*
* contain a definition.
*
* - function scopes (IVL_SCT_FUNCTION)
* These scopes represent functions. A function may not be a root,
* so it is contained within a module instance scope. A function is
* required to have a definition (in the form of a statement) and a
* signal (IVL_SIG_REG) that is its return value.
*
* A single function scope is created each time the module with the
* definition is instantiated.
*
*
* - task scopes (IVL_SCT_TASK)
* [...]
*
* ivl_scope_attr_cnt
* ivl_scope_attr_val
* A scope may have attributes attached to it. These functions
* allow the target to access the attributes values.
*
* ivl_scope_children
* A scope may in turn contain other scopes. This method iterates
* through all the child scopes of a given scope. If the function
* returns any value other then 0, the iteration stops and the
* method returns that value. Otherwise, iteration continues until
* the children run out.
*
* If the scope has no children, this method will return 0 and
* otherwise do nothing.
*
* ivl_scope_def
* Task definition scopes carry a task definition, in the form of
* a statement. This method accesses that definition.
*
* ivl_scope_event
* ivl_scope_events
* Scopes have 0 or more event objects in them.
*
* ivl_scope_var
* ivl_scope_vars
* Scopes have 0 or more variable objects in them.
*
* ivl_scope_log
* ivl_scope_logs
* Scopes have 0 or more logic devices in them. A logic device is
* represented by ivl_logic_t.
*
* ivl_scope_lpm
* ivl_scope_lpms
* Scopes have 0 or more LPM devices in them. These functions access
* those devices.
*
* ivl_scope_name
* ivl_scope_basename
* Every scope has a hierarchical name. This name is also a prefix
* of all the names of objects contained within the scope. The
* ivl_scope_basename is the name of the scope without the included
* hierarchy.
*
* ivl_scope_param
* ivl_scope_params
* A scope has zero or more named parameters. These parameters have
* a name and an expression value.
*
* ivl_scope_parent
* If this is a non-root scope, then the parent is the scope that
* contains this scope. Otherwise, the parent is nil.
*
* ivl_scope_port
* ivl_scope_ports
* Scopes that are functions or tasks have ports defined by
* signals. These methods access the ports by name.
*
* If this scope represents a function, then the ports list
* includes the return value, as port 0. The remaining ports are
* the input ports in order.
*
* ivl_scope_sig
* ivl_scope_sigs
* Scopes have 0 or more signals in them. These signals are
* anything that can become and ivl_signal_t, include synthetic
* signals generated by the compiler.
*
* ivl_scope_time_units
* Scopes have their own intrinsic time units, typically from the
* timescale compiler directive. This method returns the units as a
* signed power of 10 value.
*
* ivl_scope_type
* ivl_scope_tname
* Scopes have a type and a type name. For example, if a scope is
* an instance of module foo, its type is IVL_SCT_MODULE and its
* type name is "foo". This is different from the instance name
* returned by ivl_scope_name above.
*/
extern unsigned ivl_scope_attr_cnt(ivl_scope_t net);
extern ivl_attribute_t ivl_scope_attr_val(ivl_scope_t net, unsigned idx);
extern int ivl_scope_children(ivl_scope_t net,
ivl_scope_f func, void*cd);
extern ivl_statement_t ivl_scope_def(ivl_scope_t net);
extern unsigned ivl_scope_events(ivl_scope_t net);
extern ivl_event_t ivl_scope_event(ivl_scope_t net, unsigned idx);
extern unsigned ivl_scope_logs(ivl_scope_t net);
extern ivl_net_logic_t ivl_scope_log(ivl_scope_t net, unsigned idx);
extern unsigned ivl_scope_lpms(ivl_scope_t net);
extern ivl_lpm_t ivl_scope_lpm(ivl_scope_t, unsigned idx);
extern unsigned ivl_scope_mems(ivl_scope_t net);
extern ivl_memory_t ivl_scope_mem(ivl_scope_t net, unsigned idx);
extern unsigned ivl_scope_vars(ivl_scope_t net);
extern ivl_variable_t ivl_scope_var(ivl_scope_t net, unsigned idx);