forked from steveicarus/iverilog
-
Notifications
You must be signed in to change notification settings - Fork 0
/
PExpr.h
1063 lines (848 loc) · 34.6 KB
/
PExpr.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_PExpr_H
#define IVL_PExpr_H
/*
* Copyright (c) 1998-2021 Stephen Williams <[email protected]>
* Copyright CERN 2013 / Stephen Williams ([email protected])
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include <string>
# include <vector>
# include <valarray>
# include <memory>
# include "netlist.h"
# include "verinum.h"
# include "LineInfo.h"
# include "pform_types.h"
class Design;
class Module;
class LexicalScope;
class NetNet;
class NetExpr;
class NetScope;
class PPackage;
struct symbol_search_results;
/*
* The PExpr class hierarchy supports the description of
* expressions. The parser can generate expression objects from the
* source, possibly reducing things that it knows how to reduce.
*/
class PExpr : public LineInfo {
public:
// Mode values used by test_width() (see below for description).
enum width_mode_t { SIZED, UNSIZED, EXPAND, LOSSLESS, UPSIZE };
// Flag values that can be passed to elaborate_expr().
static const unsigned NO_FLAGS = 0x0;
static const unsigned NEED_CONST = 0x1;
static const unsigned SYS_TASK_ARG = 0x2;
static const unsigned ANNOTATABLE = 0x4;
// Convert width mode to human-readable form.
static const char*width_mode_name(width_mode_t mode);
PExpr();
virtual ~PExpr();
virtual void dump(std::ostream&) const;
// This method tests whether the expression contains any identifiers
// that have not been previously declared in the specified scope or
// in any containing scope. Any such identifiers are added to the
// specified scope as scalar nets of the specified type.
//
// This operation must be performed by the parser, to ensure that
// subsequent declarations do not affect the decision to create an
// implicit net.
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
// This method tests whether the expression contains any
// references to automatically allocated variables.
virtual bool has_aa_term(Design*des, NetScope*scope) const;
// This method tests the type and width that the expression wants
// to be. It should be called before elaborating an expression to
// figure out the type and width of the expression. It also figures
// out the minimum width that can be used to evaluate the expression
// without changing the result. This allows the expression width to
// be pruned when not all bits of the result are used.
//
// Normally mode should be initialized to SIZED before starting to
// test the width of an expression. In SIZED mode the expression
// width will be calculated strictly according to the IEEE standard
// rules for expression width.
//
// If the expression is found to contain an unsized literal number
// and gn_strict_expr_width_flag is set, mode will be changed to
// UNSIZED. In UNSIZED mode the expression width will be calculated
// exactly as in SIZED mode - the change in mode simply flags that
// the expression contains an unsized numbers.
//
// If the expression is found to contain an unsized literal number
// and gn_strict_expr_width_flag is not set, mode will be changed
// to LOSSLESS. In LOSSLESS mode the expression width will be
// calculated as the minimum width necessary to avoid arithmetic
// overflow or underflow.
//
// Once in LOSSLESS mode, if the expression is found to contain
// an operation that coerces a vector operand to a different type
// (signed <-> unsigned), mode will be changed to UPSIZE. UPSIZE
// mode is the same as LOSSLESS, except that the final expression
// width will be forced to be at least integer_width. This is
// necessary to ensure compatibility with the IEEE standard, which
// requires unsized numbers to be treated as having the same width
// as an integer. The lossless width calculation is inadequate in
// this case because coercing an operand to a different type means
// that the expression no longer obeys the normal rules of arithmetic.
//
// If mode is initialized to EXPAND instead of SIZED, the expression
// width will be calculated as the minimum width necessary to avoid
// arithmetic overflow or underflow, even if it contains no unsized
// literals. mode will be changed LOSSLESS or UPSIZE as described
// above. This supports a non-standard mode of expression width
// calculation.
//
// When the final value of mode is UPSIZE, the width returned by
// this method is the calculated lossless width, but the width
// returned by a subsequent call to the expr_width method will be
// the final expression width.
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
// After the test_width method is complete, these methods
// return valid results.
ivl_variable_type_t expr_type() const { return expr_type_; }
unsigned expr_width() const { return expr_width_; }
unsigned min_width() const { return min_width_; }
bool has_sign() const { return signed_flag_; }
// This method allows the expression type (signed/unsigned)
// to be propagated down to any context-dependant operands.
void cast_signed(bool flag) { signed_flag_ = flag; }
// This is the more generic form of the elaborate_expr method
// below. The plan is to replace the simpler elaborate_expr
// method with this version, which can handle more advanced
// types. But for now, this is only implemented in special cases.
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
// Procedural elaboration of the expression. The expr_width is
// the required width of the expression.
//
// The sys_task_arg flag is true if expressions are allowed to
// be incomplete.
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid,
unsigned flags) const;
// This method elaborates the expression as gates, but
// restricted for use as l-values of continuous assignments.
virtual NetNet* elaborate_lnet(Design*des, NetScope*scope) const;
// This is similar to elaborate_lnet, except that the
// expression is evaluated to be bi-directional. This is
// useful for arguments to inout ports of module instances and
// ports of tran primitives.
virtual NetNet* elaborate_bi_net(Design*des, NetScope*scope) const;
// Expressions that can be in the l-value of procedural
// assignments can be elaborated with this method. If the
// is_cassign or is_force flags are true, then the set of
// valid l-value types is slightly modified to accommodate
// the Verilog procedural continuous assignment statements.
virtual NetAssign_* elaborate_lval(Design*des,
NetScope*scope,
bool is_cassign,
bool is_force,
bool is_init = false) const;
// This method returns true if the expression represents a
// structural net that can have multiple drivers. This is
// used to test whether an input port connection can be
// collapsed to a single wire.
virtual bool is_collapsible_net(Design*des, NetScope*scope,
NetNet::PortType port_type) const;
protected:
unsigned fix_width_(width_mode_t mode);
// The derived class test_width methods should fill these in.
ivl_variable_type_t expr_type_;
unsigned expr_width_;
unsigned min_width_;
bool signed_flag_;
private: // not implemented
PExpr(const PExpr&);
PExpr& operator= (const PExpr&);
};
std::ostream& operator << (std::ostream&, const PExpr&);
class PEAssignPattern : public PExpr {
public:
explicit PEAssignPattern();
explicit PEAssignPattern(const std::list<PExpr*>&p);
~PEAssignPattern();
void dump(std::ostream&) const;
virtual unsigned test_width(Design*des, NetScope*scope, width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid,
unsigned flags) const;
private:
NetExpr* elaborate_expr_packed_(Design *des, NetScope *scope,
ivl_variable_type_t base_type,
unsigned int width,
const netranges_t &dims,
unsigned int cur_dim,
bool need_const) const;
NetExpr* elaborate_expr_struct_(Design *des, NetScope *scope,
const netstruct_t *struct_type,
bool need_const) const;
NetExpr* elaborate_expr_array_(Design *des, NetScope *scope,
const netarray_t *array_type,
bool need_const, bool up) const;
NetExpr* elaborate_expr_uarray_(Design *des, NetScope *scope,
const netuarray_t *uarray_type,
const netranges_t &dims,
unsigned int cur_dim,
bool need_const) const;
private:
std::vector<PExpr*>parms_;
};
class PEConcat : public PExpr {
public:
explicit PEConcat(const std::list<PExpr*>&p, PExpr*r =0);
~PEConcat();
virtual void dump(std::ostream&) const;
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
virtual bool has_aa_term(Design*des, NetScope*scope) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetNet* elaborate_lnet(Design*des, NetScope*scope) const;
virtual NetNet* elaborate_bi_net(Design*des, NetScope*scope) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
virtual NetAssign_* elaborate_lval(Design*des,
NetScope*scope,
bool is_cassign,
bool is_force,
bool is_init = false) const;
virtual bool is_collapsible_net(Design*des, NetScope*scope,
NetNet::PortType port_type) const;
private:
NetNet* elaborate_lnet_common_(Design*des, NetScope*scope,
bool bidirectional_flag) const;
private:
std::vector<PExpr*>parms_;
std::valarray<width_mode_t>width_modes_;
PExpr*repeat_;
NetScope*tested_scope_;
unsigned repeat_count_;
};
/*
* Event expressions are expressions that can be combined with the
* event "or" operator. These include "posedge foo" and similar, and
* also include named events. "edge" events are associated with an
* expression, whereas named events simply have a name, which
* represents an event variable.
*/
class PEEvent : public PExpr {
public:
enum edge_t {ANYEDGE, POSEDGE, NEGEDGE, EDGE, POSITIVE};
// Use this constructor to create events based on edges or levels.
PEEvent(edge_t t, PExpr*e);
~PEEvent();
edge_t type() const;
PExpr* expr() const;
virtual void dump(std::ostream&) const;
virtual bool has_aa_term(Design*des, NetScope*scope) const;
private:
edge_t type_;
PExpr *expr_;
};
/*
* This holds a floating point constant in the source.
*/
class PEFNumber : public PExpr {
public:
explicit PEFNumber(verireal*vp);
~PEFNumber();
const verireal& value() const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
virtual void dump(std::ostream&) const;
private:
verireal*value_;
};
class PEIdent : public PExpr {
public:
explicit PEIdent(perm_string, bool no_implicit_sig=false);
explicit PEIdent(PPackage*pkg, const pform_name_t&name);
explicit PEIdent(const pform_name_t&);
~PEIdent();
// Add another name to the string of hierarchy that is the
// current identifier.
void append_name(perm_string);
virtual void dump(std::ostream&) const;
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
virtual bool has_aa_term(Design*des, NetScope*scope) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
// Identifiers are allowed (with restrictions) is assign l-values.
virtual NetNet* elaborate_lnet(Design*des, NetScope*scope) const;
virtual NetNet* elaborate_bi_net(Design*des, NetScope*scope) const;
// Identifiers are also allowed as procedural assignment l-values.
virtual NetAssign_* elaborate_lval(Design*des,
NetScope*scope,
bool is_cassign,
bool is_force,
bool is_init = false) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
// Elaborate the PEIdent as a port to a module. This method
// only applies to Ident expressions.
NetNet* elaborate_subport(Design*des, NetScope*sc) const;
// Elaborate the identifier allowing for unpacked arrays. This
// method only applies to Ident expressions because only Ident
// expressions can can be unpacked arrays.
NetNet* elaborate_unpacked_net(Design*des, NetScope*sc) const;
virtual bool is_collapsible_net(Design*des, NetScope*scope,
NetNet::PortType port_type) const;
const pform_scoped_name_t& path() const { return path_; }
private:
pform_scoped_name_t path_;
bool no_implicit_sig_;
private:
// Common functions to calculate parts of part/bit
// selects. These methods return true if the expressions
// elaborate/calculate, or false if there is some sort of
// source error.
bool calculate_bits_(Design*, NetScope*, long&msb, bool&defined) const;
// The calculate_parts_ method calculates the range
// expressions of a part select for the current object. The
// part select expressions are elaborated and evaluated, and
// the values written to the msb/lsb arguments. If there are
// invalid bits (xz) in either expression, then the defined
// flag is set to *false*.
bool calculate_parts_(Design*, NetScope*, long&msb, long&lsb, bool&defined) const;
NetExpr* calculate_up_do_base_(Design*, NetScope*, bool need_const) const;
bool calculate_up_do_width_(Design*, NetScope*, unsigned long&wid) const;
// Evaluate the prefix indices. All but the final index in a
// chain of indices must be a single value and must evaluate
// to constants at compile time. For example:
// [x] - OK
// [1][2][x] - OK
// [1][x:y] - OK
// [2:0][x] - BAD
// [y][x] - BAD
// Leave the last index for special handling.
bool calculate_packed_indices_(Design*des, NetScope*scope, NetNet*net,
std::list<long>&prefix_indices) const;
private:
NetAssign_ *elaborate_lval_var_(Design *des, NetScope *scope,
bool is_force, bool is_cassign,
NetNet *reg, ivl_type_t data_type,
pform_name_t tail_path) const;
NetAssign_*elaborate_lval_net_word_(Design*, NetScope*, NetNet*,
bool need_const_idx) const;
bool elaborate_lval_net_bit_(Design*, NetScope*, NetAssign_*,
bool need_const_idx) const;
bool elaborate_lval_net_part_(Design*, NetScope*, NetAssign_*) const;
bool elaborate_lval_net_idx_(Design*, NetScope*, NetAssign_*,
index_component_t::ctype_t,
bool need_const_idx) const;
NetAssign_*elaborate_lval_net_class_member_(Design*, NetScope*,
const netclass_t *class_type,
NetNet*,
pform_name_t) const;
bool elaborate_lval_net_packed_member_(Design*, NetScope*,
NetAssign_*,
pform_name_t member_path) const;
bool elaborate_lval_darray_bit_(Design*, NetScope*,
NetAssign_*) const;
private:
NetExpr* elaborate_expr_(Design *des, NetScope *scope,
unsigned expr_wid, unsigned flags) const;
NetExpr*elaborate_expr_param_or_specparam_(Design*des,
NetScope*scope,
const NetExpr*par,
NetScope*found_in,
ivl_type_t par_type,
unsigned expr_wid,
unsigned flags) const;
NetExpr*elaborate_expr_param_(Design*des,
NetScope*scope,
const NetExpr*par,
const NetScope*found_in,
ivl_type_t par_type,
unsigned expr_wid,
unsigned flags) const;
NetExpr*elaborate_expr_param_bit_(Design*des,
NetScope*scope,
const NetExpr*par,
const NetScope*found_in,
ivl_type_t par_type,
bool need_const) const;
NetExpr*elaborate_expr_param_part_(Design*des,
NetScope*scope,
const NetExpr*par,
const NetScope*found_in,
ivl_type_t par_type,
unsigned expr_wid) const;
NetExpr*elaborate_expr_param_idx_up_(Design*des,
NetScope*scope,
const NetExpr*par,
const NetScope*found_in,
ivl_type_t par_type,
bool need_const) const;
NetExpr*elaborate_expr_param_idx_do_(Design*des,
NetScope*scope,
const NetExpr*par,
const NetScope*found_in,
ivl_type_t par_type,
bool need_const) const;
NetExpr*elaborate_expr_net(Design*des,
NetScope*scope,
NetNet*net,
NetScope*found,
unsigned expr_wid,
unsigned flags) const;
NetExpr*elaborate_expr_net_word_(Design*des,
NetScope*scope,
NetNet*net,
NetScope*found,
unsigned expr_wid,
unsigned flags) const;
NetExpr*elaborate_expr_net_part_(Design*des,
NetScope*scope,
NetESignal*net,
NetScope*found,
unsigned expr_wid) const;
NetExpr*elaborate_expr_net_idx_up_(Design*des,
NetScope*scope,
NetESignal*net,
NetScope*found,
bool need_const) const;
NetExpr*elaborate_expr_net_idx_do_(Design*des,
NetScope*scope,
NetESignal*net,
NetScope*found,
bool need_const) const;
NetExpr*elaborate_expr_net_bit_(Design*des,
NetScope*scope,
NetESignal*net,
NetScope*found,
bool need_const) const;
NetExpr*elaborate_expr_net_bit_last_(Design*des,
NetScope*scope,
NetESignal*net,
NetScope*found,
bool need_const) const;
NetExpr *elaborate_expr_class_field_(Design*des, NetScope*scope,
const symbol_search_results &sr,
unsigned expr_wid,
unsigned flags) const;
unsigned test_width_method_(const symbol_search_results &sr);
unsigned test_width_parameter_(const NetExpr *par, width_mode_t&mode);
private:
NetNet* elaborate_lnet_common_(Design*des, NetScope*scope,
bool bidirectional_flag) const;
bool eval_part_select_(Design*des, NetScope*scope, NetNet*sig,
long&midx, long&lidx) const;
};
class PENewArray : public PExpr {
public:
explicit PENewArray (PExpr*s, PExpr*i);
~PENewArray();
virtual void dump(std::ostream&) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
private:
PExpr*size_;
PExpr*init_;
};
class PENewClass : public PExpr {
public:
// New without (or with default) constructor
explicit PENewClass ();
// New with constructor arguments
explicit PENewClass (const std::list<named_pexpr_t> &p,
data_type_t *class_type = nullptr);
~PENewClass();
virtual void dump(std::ostream&) const;
// Class objects don't have a useful width, but the expression
// is IVL_VT_CLASS.
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
// Note that class (new) expressions only appear in context
// that uses this form of the elaborate_expr method. In fact,
// the type argument is going to be a netclass_t object.
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
private:
NetExpr* elaborate_expr_constructor_(Design*des, NetScope*scope,
const netclass_t*ctype,
NetExpr*obj, unsigned flags) const;
private:
std::vector<named_pexpr_t> parms_;
data_type_t *class_type_;
};
class PENewCopy : public PExpr {
public:
explicit PENewCopy(PExpr*src);
~PENewCopy();
virtual void dump(std::ostream&) const;
// Class objects don't have a useful width, but the expression
// is IVL_VT_CLASS.
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
// Note that class (new) expressions only appear in context
// that uses this form of the elaborate_expr method. In fact,
// the type argument is going to be a netclass_t object.
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
private:
PExpr*src_;
};
class PENull : public PExpr {
public:
explicit PENull();
~PENull();
virtual void dump(std::ostream&) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
};
class PENumber : public PExpr {
public:
explicit PENumber(verinum*vp);
~PENumber();
const verinum& value() const;
virtual void dump(std::ostream&) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr *elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetEConst*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid, unsigned) const;
virtual NetAssign_* elaborate_lval(Design*des,
NetScope*scope,
bool is_cassign,
bool is_force,
bool is_init = false) const;
private:
verinum*const value_;
};
/*
* This represents a string constant in an expression.
*
* The s parameter to the PEString constructor is a C string that this
* class instance will take for its own. The caller should not delete
* the string, the destructor will do it.
*/
class PEString : public PExpr {
public:
explicit PEString(char*s);
~PEString();
std::string value() const;
virtual void dump(std::ostream&) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetEConst*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetEConst*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid, unsigned) const;
private:
char*text_;
};
class PETypename : public PExpr {
public:
explicit PETypename(data_type_t*data_type);
~PETypename();
virtual void dump(std::ostream&) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
inline data_type_t* get_type() const { return data_type_; }
private:
data_type_t*data_type_;
};
class PEUnary : public PExpr {
public:
explicit PEUnary(char op, PExpr*ex);
~PEUnary();
virtual void dump(std::ostream&out) const;
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
virtual bool has_aa_term(Design*des, NetScope*scope) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
public:
inline char get_op() const { return op_; }
inline PExpr*get_expr() const { return expr_; }
private:
NetExpr* elaborate_expr_bits_(NetExpr*operand, unsigned expr_wid) const;
private:
char op_;
PExpr*expr_;
};
class PEBinary : public PExpr {
public:
explicit PEBinary(char op, PExpr*l, PExpr*r);
~PEBinary();
virtual void dump(std::ostream&out) const;
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
virtual bool has_aa_term(Design*des, NetScope*scope) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
protected:
char op_;
PExpr*left_;
PExpr*right_;
NetExpr*elaborate_expr_base_(Design*, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
NetExpr*elaborate_eval_expr_base_(Design*, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
NetExpr*elaborate_expr_base_bits_(Design*, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
NetExpr*elaborate_expr_base_div_(Design*, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
NetExpr*elaborate_expr_base_mult_(Design*, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
NetExpr*elaborate_expr_base_add_(Design*, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
};
/*
* Here are a few specialized classes for handling specific binary
* operators.
*/
class PEBComp : public PEBinary {
public:
explicit PEBComp(char op, PExpr*l, PExpr*r);
~PEBComp();
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
NetExpr* elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid, unsigned flags) const;
private:
unsigned l_width_;
unsigned r_width_;
};
/*
* This derived class is for handling logical expressions: && and ||.
*/
class PEBLogic : public PEBinary {
public:
explicit PEBLogic(char op, PExpr*l, PExpr*r);
~PEBLogic();
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
NetExpr* elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid, unsigned flags) const;
};
/*
* A couple of the binary operands have a special sub-expression rule
* where the expression width is carried entirely by the left
* expression, and the right operand is self-determined.
*/
class PEBLeftWidth : public PEBinary {
public:
explicit PEBLeftWidth(char op, PExpr*l, PExpr*r);
~PEBLeftWidth() =0;
virtual NetExpr*elaborate_expr_leaf(Design*des, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const =0;
protected:
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid,
unsigned flags) const;
};
class PEBPower : public PEBLeftWidth {
public:
explicit PEBPower(char op, PExpr*l, PExpr*r);
~PEBPower();
NetExpr*elaborate_expr_leaf(Design*des, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
};
class PEBShift : public PEBLeftWidth {
public:
explicit PEBShift(char op, PExpr*l, PExpr*r);
~PEBShift();
NetExpr*elaborate_expr_leaf(Design*des, NetExpr*lp, NetExpr*rp,
unsigned expr_wid) const;
};
/*
* This class supports the ternary (?:) operator. The operator takes
* three expressions, the test, the true result and the false result.
*/
class PETernary : public PExpr {
public:
explicit PETernary(PExpr*e, PExpr*t, PExpr*f);
~PETernary();
virtual void dump(std::ostream&out) const;
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
virtual bool has_aa_term(Design*des, NetScope*scope) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
unsigned expr_wid,
unsigned flags) const;
private:
NetExpr* elab_and_eval_alternative_(Design*des, NetScope*scope,
PExpr*expr, unsigned expr_wid,
unsigned flags, bool short_cct) const;
private:
PExpr*expr_;
PExpr*tru_;
PExpr*fal_;
};
/*
* This class represents a parsed call to a function, including calls
* to system functions. The parameters in the parms list are the
* expressions that are passed as input to the ports of the function.
*/
class PECallFunction : public PExpr {
public:
explicit PECallFunction(const pform_name_t &n, const std::vector<named_pexpr_t> &parms);
// Call function defined in package.
explicit PECallFunction(PPackage *pkg, const pform_name_t &n, const std::list<named_pexpr_t> &parms);
// Used to convert a user function called as a task
explicit PECallFunction(PPackage *pkg, const pform_name_t &n, const std::vector<named_pexpr_t> &parms);
// Call of system function (name is not hierarchical)
explicit PECallFunction(perm_string n, const std::vector<named_pexpr_t> &parms);
explicit PECallFunction(perm_string n);
// std::list versions. Should be removed!
explicit PECallFunction(const pform_name_t &n, const std::list<named_pexpr_t> &parms);
explicit PECallFunction(perm_string n, const std::list<named_pexpr_t> &parms);
~PECallFunction();
virtual void dump(std::ostream &) const;
virtual void declare_implicit_nets(LexicalScope*scope, NetNet::Type type);
virtual bool has_aa_term(Design*des, NetScope*scope) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
ivl_type_t type, unsigned flags) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid, unsigned flags) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
private:
pform_scoped_name_t path_;
std::vector<named_pexpr_t> parms_;
// For system functions.
bool is_overridden_;
bool check_call_matches_definition_(Design*des, NetScope*dscope) const;
NetExpr* cast_to_width_(NetExpr*expr, unsigned wid) const;
NetExpr* elaborate_expr_(Design *des, NetScope *scope,
unsigned flags) const;
NetExpr* elaborate_expr_method_(Design*des, NetScope*scope,
symbol_search_results&search_results)
const;
NetExpr* elaborate_expr_method_par_(Design*des, NetScope*scope,
symbol_search_results&search_results)
const;
NetExpr* elaborate_sfunc_(Design*des, NetScope*scope,
unsigned expr_wid,
unsigned flags) const;
NetExpr* elaborate_access_func_(Design*des, NetScope*scope, ivl_nature_t)
const;
unsigned test_width_sfunc_(Design*des, NetScope*scope,
width_mode_t&mode);
unsigned test_width_method_(Design*des, NetScope*scope,
symbol_search_results&search_results,
width_mode_t&mode);
NetExpr*elaborate_base_(Design*des, NetScope*scope, NetScope*dscope,
unsigned flags) const;
unsigned elaborate_arguments_(Design*des, NetScope*scope,
NetFuncDef*def, bool need_const,
std::vector<NetExpr*>&parms,
unsigned parm_off) const;
};
/*
* Support the SystemVerilog cast to size.
*/
class PECastSize : public PExpr {
public:
explicit PECastSize(PExpr*size, PExpr*base);
~PECastSize();
void dump(std::ostream &out) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
unsigned expr_wid,
unsigned flags) const;
virtual bool has_aa_term(Design *des, NetScope *scope) const;
virtual unsigned test_width(Design*des, NetScope*scope,
width_mode_t&mode);
private:
PExpr* size_;
PExpr* base_;
};
/*
* Support the SystemVerilog cast to a different type.
*/