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5796524 Add ne_expr.cc
steve authored
1 /*
331faa2 @caryr Add signed bit based power to continuous assignments.
caryr authored
2 * Copyright (c) 2002-2008 Stephen Williams (steve@icarus.com)
5796524 Add ne_expr.cc
steve authored
3 *
4 * This source code is free software; you can redistribute it
5 * and/or modify it in source code form under the terms of the GNU
6 * General Public License as published by the Free Software
7 * Foundation; either version 2 of the License, or (at your option)
8 * any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
18 */
19
928df5c include config.h to eliminate warnings.
steve authored
20 # include "config.h"
5796524 Add ne_expr.cc
steve authored
21 # include "netlist.h"
4c67de5 Add the lex_strings string handler, and put
steve authored
22 # include "compiler.h"
fe72d02 @caryr Major rework of the ternary operator elaboration code.
caryr authored
23 # include "netmisc.h"
28e0616 Use standard name for iostream.
steve authored
24 # include <iostream>
5796524 Add ne_expr.cc
steve authored
25
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
26 /*
27 * the grand default data type is a logic vector.
28 */
29 ivl_variable_type_t NetExpr::expr_type() const
46253ed Rework expression parsing and elaboration to
steve authored
30 {
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
31 return IVL_VT_LOGIC;
46253ed Rework expression parsing and elaboration to
steve authored
32 }
33
de94d09 No need to keep excess width from an
steve authored
34 /*
35 * Create an add/sub node from the two operands. Make a best guess of
e4ae832 Clean up spurious trailing white space.
steve authored
36 * the
de94d09 No need to keep excess width from an
steve authored
37 */
845e74c @steveicarus Evaluate parameter expressions losslessly
authored
38 NetEBAdd::NetEBAdd(char op, NetExpr*l, NetExpr*r, bool lossless_flag)
de94d09 No need to keep excess width from an
steve authored
39 : NetEBinary(op, l, r)
40 {
41 NetEConst* tmp;
42
43 /* Catch the special case that one of the operands is an
44 unsized constant number. If so, then we should set the
45 width of that number to the size of the other operand, plus
46 one. This expands the expression to account for the largest
47 possible result.
48
c7edace @steveicarus Unsized integers have minimum size
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49 Remember to handle the special case of an unsized constant,
50 which we define to be at least "integer_width" bits.
51
de94d09 No need to keep excess width from an
steve authored
52 The set_width applied to a constant value will only
53 truncate the constant so far as it can still hold its
54 logical value, so this is safe to do. */
55 if ( (tmp = dynamic_cast<NetEConst*>(r))
56 && (! tmp->has_width())
c7edace @steveicarus Unsized integers have minimum size
authored
57 && (tmp->expr_width() > l->expr_width() || integer_width > l->expr_width()) ) {
de94d09 No need to keep excess width from an
steve authored
58
59 unsigned target_width = l->expr_width() + 1;
c7edace @steveicarus Unsized integers have minimum size
authored
60 if (target_width < integer_width)
61 target_width = integer_width;
de94d09 No need to keep excess width from an
steve authored
62 r->set_width(target_width);
63
64 /* Note: This constant value will not gain a defined
7c1401a Spelling patch.
steve authored
65 width from this. Make sure. */
de94d09 No need to keep excess width from an
steve authored
66 assert(! r->has_width() );
67
68 } else if ( (tmp = dynamic_cast<NetEConst*>(l))
69 && (! tmp->has_width())
c7edace @steveicarus Unsized integers have minimum size
authored
70 && (tmp->expr_width() > r->expr_width() || integer_width > r->expr_width()) ) {
de94d09 No need to keep excess width from an
steve authored
71
72 unsigned target_width = r->expr_width() + 1;
c7edace @steveicarus Unsized integers have minimum size
authored
73 if (target_width < integer_width)
74 target_width = integer_width;
de94d09 No need to keep excess width from an
steve authored
75 l->set_width(target_width);
76
77 /* Note: This constant value will not gain a defined
7c1401a Spelling patch.
steve authored
78 width from this. Make sure. */
de94d09 No need to keep excess width from an
steve authored
79 assert(! l->has_width() );
80
81 }
82
845e74c @steveicarus Evaluate parameter expressions losslessly
authored
83 unsigned pad_width = lossless_flag? 1 : 0;
bbed408 @steveicarus When padding logic constants, sign extend x/z properly.
authored
84 cast_signed(l->has_sign() && r->has_sign());
845e74c @steveicarus Evaluate parameter expressions losslessly
authored
85
de94d09 No need to keep excess width from an
steve authored
86 /* Now that we have the operand sizes the way we like, or as
87 good as we are going to get them, set the size of myself. */
88 if (r->expr_width() > l->expr_width()) {
89
845e74c @steveicarus Evaluate parameter expressions losslessly
authored
90 expr_width(r->expr_width() + pad_width);
de94d09 No need to keep excess width from an
steve authored
91
92 } else {
845e74c @steveicarus Evaluate parameter expressions losslessly
authored
93 expr_width(l->expr_width() + pad_width);
de94d09 No need to keep excess width from an
steve authored
94 }
95 }
96
97 NetEBAdd::~NetEBAdd()
98 {
99 }
100
101 NetEBAdd* NetEBAdd::dup_expr() const
102 {
103 NetEBAdd*result = new NetEBAdd(op_, left_->dup_expr(),
104 right_->dup_expr());
105 return result;
106 }
107
b9799cf Remove NetVariable and ivl_variable_t structures.
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108 ivl_variable_type_t NetEBAdd::expr_type() const
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109 {
b9799cf Remove NetVariable and ivl_variable_t structures.
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110 if (left_->expr_type() == IVL_VT_REAL)
111 return IVL_VT_REAL;
46253ed Rework expression parsing and elaboration to
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112
b9799cf Remove NetVariable and ivl_variable_t structures.
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113 if (right_->expr_type() == IVL_VT_REAL)
114 return IVL_VT_REAL;
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115
b9799cf Remove NetVariable and ivl_variable_t structures.
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116 return IVL_VT_LOGIC;
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117 }
118
c602d94 Comparison operators do have defined width.
steve authored
119 /*
120 * Create a comparison operator with two sub-expressions.
121 *
122 * Handle the special case of an unsized constant on the left or right
123 * side by resizing the number to match the other
124 * expression. Otherwise, the netlist will have to allow the
125 * expressions to have different widths.
126 */
127 NetEBComp::NetEBComp(char op, NetExpr*l, NetExpr*r)
128 : NetEBinary(op, l, r)
129 {
130 if (NetEConst*tmp = dynamic_cast<NetEConst*>(r)) do {
131
132 if (tmp->has_width())
133 break;
134
7e2848b Do not try to set constants to width 0.
steve authored
135 if (l->expr_width() == 0)
136 break;
137
c602d94 Comparison operators do have defined width.
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138 if (tmp->expr_width() == l->expr_width())
139 break;
140
141 tmp->set_width(l->expr_width());
142
143 } while (0);
144
145 if (NetEConst*tmp = dynamic_cast<NetEConst*>(l)) do {
146
147 if (tmp->has_width())
148 break;
149
7e2848b Do not try to set constants to width 0.
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150 if (r->expr_width() == 0)
151 break;
152
c602d94 Comparison operators do have defined width.
steve authored
153 if (tmp->expr_width() == r->expr_width())
154 break;
155
156 tmp->set_width(r->expr_width());
157
158 } while (0);
159
160
161 expr_width(1);
162 }
163
164 NetEBComp::~NetEBComp()
165 {
166 }
167
168 bool NetEBComp::has_width() const
169 {
170 return true;
171 }
172
9fd1657 Support bool expressions and compares handle them optimally.
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173 ivl_variable_type_t NetEBComp::expr_type() const
174 {
175 // Case compare always returns BOOL
176 if (op() == 'E' || op() == 'N')
177 return IVL_VT_BOOL;
178
179 if (left()->expr_type() == IVL_VT_LOGIC)
180 return IVL_VT_LOGIC;
181
182 if (right()->expr_type() == IVL_VT_LOGIC)
183 return IVL_VT_LOGIC;
184
185 return IVL_VT_BOOL;
186 }
187
46253ed Rework expression parsing and elaboration to
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188 NetEBDiv::NetEBDiv(char op, NetExpr*l, NetExpr*r)
189 : NetEBinary(op, l, r)
190 {
191 unsigned w = l->expr_width();
192 if (r->expr_width() > w)
193 w = r->expr_width();
194
195 expr_width(w);
196 cast_signed(l->has_sign() && r->has_sign());
197 }
198
199 NetEBDiv::~NetEBDiv()
200 {
201 }
202
203 NetEBDiv* NetEBDiv::dup_expr() const
204 {
205 NetEBDiv*result = new NetEBDiv(op_, left_->dup_expr(),
206 right_->dup_expr());
207 return result;
208 }
209
b9799cf Remove NetVariable and ivl_variable_t structures.
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210 ivl_variable_type_t NetEBDiv::expr_type() const
46253ed Rework expression parsing and elaboration to
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211 {
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
212 if (left_->expr_type() == IVL_VT_REAL)
213 return IVL_VT_REAL;
46253ed Rework expression parsing and elaboration to
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214
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
215 if (right_->expr_type() == IVL_VT_REAL)
216 return IVL_VT_REAL;
46253ed Rework expression parsing and elaboration to
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217
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
218 return IVL_VT_LOGIC;
46253ed Rework expression parsing and elaboration to
steve authored
219 }
220
d60df2d @steveicarus Implement abs/min/max operators for real values.
authored
221 NetEBMinMax::NetEBMinMax(char op, NetExpr*l, NetExpr*r)
222 : NetEBinary(op, l, r)
223 {
224 expr_width( max(l->expr_width(), r->expr_width()) );
225 cast_signed(l->has_sign() || r->has_sign());
226 }
227
228 NetEBMinMax::~NetEBMinMax()
229 {
230 }
231
232 ivl_variable_type_t NetEBMinMax::expr_type() const
233 {
234 if (left_->expr_type() == IVL_VT_REAL)
235 return IVL_VT_REAL;
236 if (right_->expr_type() == IVL_VT_REAL)
237 return IVL_VT_REAL;
238
239 return IVL_VT_LOGIC;
240 }
241
46253ed Rework expression parsing and elaboration to
steve authored
242 NetEBMult::NetEBMult(char op, NetExpr*l, NetExpr*r)
243 : NetEBinary(op, l, r)
244 {
245 expr_width(l->expr_width() + r->expr_width());
246 cast_signed(l->has_sign() && r->has_sign());
222eaa0 Operands of unsigned multiply are unsigned.
steve authored
247
248 /* If it turns out that this is not a signed expression, then
249 cast the signedness out of the operands as well. */
250 if (! has_sign()) {
251 l->cast_signed(false);
252 r->cast_signed(false);
253 }
46253ed Rework expression parsing and elaboration to
steve authored
254 }
255
256 NetEBMult::~NetEBMult()
257 {
258 }
259
260 NetEBMult* NetEBMult::dup_expr() const
261 {
262 NetEBMult*result = new NetEBMult(op_, left_->dup_expr(),
263 right_->dup_expr());
264 return result;
265 }
266
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
267 ivl_variable_type_t NetEBMult::expr_type() const
46253ed Rework expression parsing and elaboration to
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268 {
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
269 if (left_->expr_type() == IVL_VT_REAL)
270 return IVL_VT_REAL;
46253ed Rework expression parsing and elaboration to
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271
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
272 if (right_->expr_type() == IVL_VT_REAL)
273 return IVL_VT_REAL;
46253ed Rework expression parsing and elaboration to
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274
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
275 return IVL_VT_LOGIC;
46253ed Rework expression parsing and elaboration to
steve authored
276 }
277
49b65e8 Add support for power in constant expressions.
steve authored
278 NetEBPow::NetEBPow(char op, NetExpr*l, NetExpr*r)
279 : NetEBinary(op, l, r)
280 {
281 assert(op == 'p');
331faa2 @caryr Add signed bit based power to continuous assignments.
caryr authored
282 /* This is incorrect! a * (2^b - 1) is close. */
283 expr_width(l->expr_width()+r->expr_width());
49b65e8 Add support for power in constant expressions.
steve authored
284 cast_signed(l->has_sign() || r->has_sign());
285 }
286
287 NetEBPow::~NetEBPow()
288 {
289 }
290
291 NetEBPow* NetEBPow::dup_expr() const
292 {
293 NetEBPow*result = new NetEBPow(op_, left_->dup_expr(),
294 right_->dup_expr());
295 result->set_line(*this);
296 return result;
297 }
298
299 ivl_variable_type_t NetEBPow::expr_type() const
300 {
301 if (right_->expr_type() == IVL_VT_REAL)
302 return IVL_VT_REAL;
303 if (left_->expr_type() == IVL_VT_REAL)
304 return IVL_VT_REAL;
305 if (left_->has_sign())
306 return IVL_VT_REAL;
307 if (right_->has_sign())
308 return IVL_VT_REAL;
309
310 return IVL_VT_LOGIC;
311 }
312
71a404a Add arithmetic shift operators.
steve authored
313 NetEBShift::NetEBShift(char op, NetExpr*l, NetExpr*r)
314 : NetEBinary(op, l, r)
315 {
316 expr_width(l->expr_width());
317
318 // The >>> is signed if the left operand is signed.
319 if (op == 'R') cast_signed(l->has_sign());
320 }
321
322 NetEBShift::~NetEBShift()
323 {
324 }
325
326 bool NetEBShift::has_width() const
327 {
328 return left_->has_width();
329 }
330
331 NetEBShift* NetEBShift::dup_expr() const
332 {
333 NetEBShift*result = new NetEBShift(op_, left_->dup_expr(),
334 right_->dup_expr());
335 return result;
336 }
337
8667b9a Put off evaluation of concatenation repeat expresions
steve authored
338 NetEConcat::NetEConcat(unsigned cnt, NetExpr* r)
339 : parms_(cnt), repeat_(r)
340 {
341 if (repeat_ == 0) {
342 repeat_calculated_ = true;
343 repeat_value_ = 1;
344 } else {
345 repeat_calculated_ = false;
346 }
347
348 expr_width(0);
349 }
350
351 NetEConcat::~NetEConcat()
352 {
353 for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1)
354 delete parms_[idx];
355 }
356
aa8869a Postpone parameter width check to evaluation.
steve authored
357 bool NetEConcat::has_width() const
358 {
359 return true;
360 }
361
8667b9a Put off evaluation of concatenation repeat expresions
steve authored
362 void NetEConcat::set(unsigned idx, NetExpr*e)
363 {
364 assert(idx < parms_.count());
365 assert(parms_[idx] == 0);
366 parms_[idx] = e;
367 expr_width( expr_width() + e->expr_width() );
368 }
369
370 NetEConcat* NetEConcat::dup_expr() const
371 {
372 NetEConcat*dup = new NetEConcat(parms_.count(), repeat_);
373 for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1)
374 if (parms_[idx]) {
375 NetExpr*tmp = parms_[idx]->dup_expr();
376 assert(tmp);
377 dup->parms_[idx] = tmp;
378 }
379
380
381 dup->expr_width(expr_width());
382 return dup;
383 }
384
385 unsigned NetEConcat::repeat()
386 {
387 if (repeat_calculated_)
388 return repeat_value_;
389
fe72d02 @caryr Major rework of the ternary operator elaboration code.
caryr authored
390 eval_expr(repeat_);
8667b9a Put off evaluation of concatenation repeat expresions
steve authored
391
392 NetEConst*repeat_const = dynamic_cast<NetEConst*>(repeat_);
393
394 /* This should not be possible, as it was checked earlier to
395 assure that this is a constant expression. */
396 if (repeat_const == 0) {
7975e14 @steveicarus LineInfo uses perm_string for path.
authored
397 cerr << get_fileline() << ": internal error: repeat expression "
8667b9a Put off evaluation of concatenation repeat expresions
steve authored
398 << "is not a compile time constant." << endl;
7975e14 @steveicarus LineInfo uses perm_string for path.
authored
399 cerr << get_fileline() << ": : Expression is: "
8667b9a Put off evaluation of concatenation repeat expresions
steve authored
400 << *repeat_ << endl;
401 repeat_calculated_ = true;
402 repeat_value_ = 1;
403 return 1;
404 }
405
406 repeat_calculated_ = true;
407 repeat_value_ = repeat_const->value().as_ulong();
408
409 delete repeat_;
410 repeat_ = 0;
411
412 return repeat_value_;
413 }
414
415 unsigned NetEConcat::repeat() const
416 {
417 assert(repeat_calculated_);
418 return repeat_value_;
419 }
420
46253ed Rework expression parsing and elaboration to
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421 NetECReal::NetECReal(const verireal&val)
422 : value_(val)
423 {
30273a1 @steveicarus Real value constants have width 1
authored
424 expr_width(1);
46253ed Rework expression parsing and elaboration to
steve authored
425 }
426
427 NetECReal::~NetECReal()
428 {
429 }
430
431 const verireal& NetECReal::value() const
432 {
433 return value_;
434 }
435
589422b Real constants have no defined vector width
steve authored
436 bool NetECReal::has_width() const
437 {
438 return false;
439 }
440
46253ed Rework expression parsing and elaboration to
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441 NetECReal* NetECReal::dup_expr() const
442 {
443 NetECReal*tmp = new NetECReal(value_);
444 tmp->set_line(*this);
445 return tmp;
446 }
447
b9799cf Remove NetVariable and ivl_variable_t structures.
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448 ivl_variable_type_t NetECReal::expr_type() const
46253ed Rework expression parsing and elaboration to
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449 {
b9799cf Remove NetVariable and ivl_variable_t structures.
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450 return IVL_VT_REAL;
46253ed Rework expression parsing and elaboration to
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451 }
452
1295058 parameter keys are per_strings.
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453 NetECRealParam::NetECRealParam(NetScope*s, perm_string n, const verireal&v)
5903f07 Support parameters in real expressions and
steve authored
454 : NetECReal(v), scope_(s), name_(n)
455 {
456 }
457
458 NetECRealParam::~NetECRealParam()
459 {
460 }
461
1295058 parameter keys are per_strings.
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462 perm_string NetECRealParam::name() const
5903f07 Support parameters in real expressions and
steve authored
463 {
464 return name_;
465 }
466
467 const NetScope* NetECRealParam::scope() const
468 {
469 return scope_;
470 }
471
472
7e1e44e Properly cast signedness of parameters with ranges.
steve authored
473 NetEParam::NetEParam()
4350180 Redo the parameter vector support to allow
steve authored
474 : des_(0), scope_(0)
7e1e44e Properly cast signedness of parameters with ranges.
steve authored
475 {
476 }
477
1295058 parameter keys are per_strings.
steve authored
478 NetEParam::NetEParam(Design*d, NetScope*s, perm_string n)
c76e88c @steveicarus Add support for explicit parameter types, including real.
authored
479 : des_(d), scope_(s), reference_(scope_->find_parameter(n))
480 {
481 }
482
483 NetEParam::NetEParam(Design*d, NetScope*s, ref_t ref)
484 : des_(d), scope_(s), reference_(ref)
7e1e44e Properly cast signedness of parameters with ranges.
steve authored
485 {
486 }
487
488 NetEParam::~NetEParam()
489 {
490 }
491
492 bool NetEParam::has_width() const
493 {
494 return false;
495 }
496
c76e88c @steveicarus Add support for explicit parameter types, including real.
authored
497 ivl_variable_type_t NetEParam::expr_type() const
498 {
499 return (*reference_).second.type;
500 }
501
7e1e44e Properly cast signedness of parameters with ranges.
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502 NetEParam* NetEParam::dup_expr() const
503 {
c76e88c @steveicarus Add support for explicit parameter types, including real.
authored
504 NetEParam*tmp = new NetEParam(des_, scope_, reference_);
5903f07 Support parameters in real expressions and
steve authored
505 tmp->set_line(*this);
506 return tmp;
7e1e44e Properly cast signedness of parameters with ranges.
steve authored
507 }
508
5796524 Add ne_expr.cc
steve authored
509 NetESelect::NetESelect(NetExpr*exp, NetExpr*base, unsigned wid)
510 : expr_(exp), base_(base)
511 {
512 expr_width(wid);
513 }
514
515 NetESelect::~NetESelect()
516 {
517 delete expr_;
518 delete base_;
519 }
520
521 const NetExpr*NetESelect::sub_expr() const
522 {
523 return expr_;
524 }
525
526 const NetExpr*NetESelect::select() const
527 {
528 return base_;
529 }
530
531 bool NetESelect::has_width() const
532 {
533 return true;
534 }
535
b9799cf Remove NetVariable and ivl_variable_t structures.
steve authored
536 NetESFunc::NetESFunc(const char*n, ivl_variable_type_t t,
6d94f2e Better organize the NetESFunc return type guesses.
steve authored
537 unsigned width, unsigned np)
538 : name_(0), type_(t)
04ada23 Support in various contexts the $realtime
steve authored
539 {
4c67de5 Add the lex_strings string handler, and put
steve authored
540 name_ = lex_strings.add(n);
04ada23 Support in various contexts the $realtime
steve authored
541 expr_width(width);
542 nparms_ = np;
543 parms_ = new NetExpr*[np];
544 for (unsigned idx = 0 ; idx < nparms_ ; idx += 1)
545 parms_[idx] = 0;
546 }
547
548 NetESFunc::~NetESFunc()
549 {
550 for (unsigned idx = 0 ; idx < nparms_ ; idx += 1)
551 if (parms_[idx]) delete parms_[idx];
552
553 delete[]parms_;
4c67de5 Add the lex_strings string handler, and put
steve authored
554 /* name_ string ls lex_strings allocated. */
04ada23 Support in various contexts the $realtime
steve authored
555 }
556
557 const char* NetESFunc::name() const
558 {
559 return name_;
560 }
561
562 unsigned NetESFunc::nparms() const
563 {
564 return nparms_;
565 }
566
567 void NetESFunc::parm(unsigned idx, NetExpr*v)
568 {
569 assert(idx < nparms_);
570 if (parms_[idx])
571 delete parms_[idx];
572 parms_[idx] = v;
573 }
574
575 const NetExpr* NetESFunc::parm(unsigned idx) const
576 {
577 assert(idx < nparms_);
578 return parms_[idx];
579 }
580
581 NetExpr* NetESFunc::parm(unsigned idx)
582 {
583 assert(idx < nparms_);
584 return parms_[idx];
585 }
586
b9799cf Remove NetVariable and ivl_variable_t structures.
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587 ivl_variable_type_t NetESFunc::expr_type() const
04ada23 Support in various contexts the $realtime
steve authored
588 {
6d94f2e Better organize the NetESFunc return type guesses.
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589 return type_;
04ada23 Support in various contexts the $realtime
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590 }
9f04641 @steveicarus Detect and elaborate AMS access functions.
authored
591
592 NetEAccess::NetEAccess(nature_t*nat)
593 : nature_(nat)
594 {
595 }
596
597 NetEAccess::~NetEAccess()
598 {
599 }
600
601 ivl_variable_type_t NetEAccess::expr_type() const
602 {
603 return IVL_VT_REAL;
604 }
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