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
|
//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Text;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using Microsoft.Basetypes;
// A simple visitor for turning a VCExpr into a human-readable string
// (S-expr syntax)
namespace Microsoft.Boogie.VCExprAST {
public class VCExprPrinter : IVCExprVisitor<bool, TextWriter/*!*/> {
private VCExprOpPrinter OpPrinterVar = null;
private VCExprOpPrinter/*!*/ OpPrinter {
get {
Contract.Ensures(Contract.Result<VCExprOpPrinter>() != null);
if (OpPrinterVar == null)
OpPrinterVar = new VCExprOpPrinter(this);
return OpPrinterVar;
}
}
public void Print(VCExpr expr, TextWriter wr) {
Contract.Requires(wr != null);
Contract.Requires(expr != null);
expr.Accept<bool, TextWriter/*!*/>(this, wr);
}
public bool Visit(VCExprLiteral node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
if (node == VCExpressionGenerator.True) {
wr.Write("true");
} else if (node == VCExpressionGenerator.False) {
wr.Write("false");
} else if (node is VCExprIntLit) {
wr.Write(((VCExprIntLit)node).Val);
} else {
Contract.Assert(false);
throw new cce.UnreachableException();
}
return true;
}
public bool Visit(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
VCExprOp/*!*/ op = node.Op;
Contract.Assert(op != null);
if (op.Equals(VCExpressionGenerator.AndOp) ||
op.Equals(VCExpressionGenerator.OrOp)) {
// handle these operators without recursion
wr.Write("({0}",
op.Equals(VCExpressionGenerator.AndOp) ? "And" : "Or");
IEnumerator/*!*/ enumerator = new VCExprNAryUniformOpEnumerator(node);
Contract.Assert(enumerator != null);
while (enumerator.MoveNext()) {
VCExprNAry naryExpr = enumerator.Current as VCExprNAry;
if (naryExpr == null || !naryExpr.Op.Equals(op)) {
wr.Write(" ");
Print(cce.NonNull((VCExpr/*!*/)enumerator.Current), wr);
}
}
wr.Write(")");
return true;
}
return node.Accept<bool, TextWriter/*!*/>(OpPrinter, wr);
}
public bool Visit(VCExprVar node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
wr.Write(node.Name);
return true;
}
public bool Visit(VCExprQuantifier node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
string/*!*/ quan = node.Quan == Quantifier.ALL ? "Forall" : "Exists";
Contract.Assert(quan != null);
wr.Write("({0} ", quan);
if (node.TypeParameters.Count > 0) {
wr.Write("<");
string/*!*/ sep = "";
foreach (TypeVariable/*!*/ v in node.TypeParameters) {
Contract.Assert(v != null);
wr.Write(sep);
sep = ", ";
wr.Write("{0}", v.Name);
}
wr.Write("> ");
}
if (node.BoundVars.Count > 0) {
string/*!*/ sep = "";
foreach (VCExprVar/*!*/ v in node.BoundVars) {
Contract.Assert(v != null);
wr.Write(sep);
sep = ", ";
Print(v, wr);
}
wr.Write(" ");
}
wr.Write(":: ");
if (node.Triggers.Count > 0) {
wr.Write("{0} ", "{");
string/*!*/ sep = "";
foreach (VCTrigger/*!*/ t in node.Triggers) {
Contract.Assert(t != null);
wr.Write(sep);
sep = ", ";
string/*!*/ sep2 = "";
foreach (VCExpr/*!*/ e in t.Exprs) {
Contract.Assert(e != null);
wr.Write(sep2);
sep2 = "+";
Print(e, wr);
}
}
wr.Write(" {0} ", "}");
}
Print(node.Body, wr);
wr.Write(")");
return true;
}
public bool Visit(VCExprLet node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
wr.Write("(Let ");
string/*!*/ sep = "";
foreach (VCExprLetBinding/*!*/ b in node) {
Contract.Assert(b != null);
wr.Write(sep);
sep = ", ";
Print(b.V, wr);
wr.Write(" = ");
Print(b.E, wr);
}
wr.Write(" ");
Print(node.Body, wr);
wr.Write(")");
return true;
}
}
public class VCExprOpPrinter : IVCExprOpVisitor<bool, TextWriter/*!*/> {
private VCExprPrinter/*!*/ ExprPrinter;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(ExprPrinter != null);
}
public VCExprOpPrinter(VCExprPrinter exprPrinter) {
Contract.Requires(exprPrinter != null);
this.ExprPrinter = exprPrinter;
}
private bool PrintNAry(string op, VCExprNAry node, TextWriter wr) {
Contract.Requires(wr != null);
Contract.Requires(node != null);
Contract.Requires(op != null);
wr.Write("({0}", op);
foreach (VCExpr/*!*/ arg in node) {
Contract.Assert(arg != null);
wr.Write(" ");
ExprPrinter.Print(arg, wr);
}
wr.Write(")");
return true;
}
public bool VisitNotOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("!", node, wr);
}
public bool VisitEqOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("==", node, wr);
}
public bool VisitNeqOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("!=", node, wr);
}
public bool VisitAndOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
Contract.Assert(false);
throw new cce.UnreachableException();
}
public bool VisitOrOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
Contract.Assert(false);
throw new cce.UnreachableException();
}
public bool VisitImpliesOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("Implies", node, wr);
}
public bool VisitDistinctOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("Distinct", node, wr);
}
public bool VisitLabelOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
VCExprLabelOp/*!*/ op = (VCExprLabelOp)node.Op;
Contract.Assert(op != null);
return PrintNAry("Label " + op.label, node, wr);
}
public bool VisitSelectOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("Select", node, wr);
}
public bool VisitStoreOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("Store", node, wr);
}
public bool VisitFloatAddOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.add", node, wr);
}
public bool VisitFloatSubOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.sub", node, wr);
}
public bool VisitFloatMulOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.mul", node, wr);
}
public bool VisitFloatDivOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.div", node, wr);
}
public bool VisitFloatRemOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.rem", node, wr);
}
public bool VisitFloatMinOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.min", node, wr);
}
public bool VisitFloatMaxOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.max", node, wr);
}
public bool VisitFloatLeqOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.leq", node, wr);
}
public bool VisitFloatLtOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.lt", node, wr);
}
public bool VisitFloatGeqOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.geq", node, wr);
}
public bool VisitFloatGtOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.gt", node, wr);
}
public bool VisitFloatEqOp(VCExprNAry node, TextWriter wr)
{
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("fp.eq", node, wr);
}
public bool VisitBvOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("Bv", node, wr);
}
public bool VisitBvExtractOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("BvExtract", node, wr);
}
public bool VisitBvConcatOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("BvConcat", node, wr);
}
public bool VisitIfThenElseOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("if-then-else", node, wr);
}
public bool VisitCustomOp(VCExprNAry/*!*/ node, TextWriter/*!*/ wr) {
//Contract.Requires(node!=null);
//Contract.Requires(wr != null);
VCExprCustomOp op = (VCExprCustomOp)node.Op;
return PrintNAry(op.Name, node, wr);
}
public bool VisitAddOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
if (CommandLineOptions.Clo.ReflectAdd) {
return PrintNAry("Reflect$Add", node, wr);
} else {
return PrintNAry("+", node, wr);
}
}
public bool VisitSubOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("-", node, wr);
}
public bool VisitMulOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("*", node, wr);
}
public bool VisitDivOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("div", node, wr);
}
public bool VisitModOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("mod", node, wr);
}
public bool VisitRealDivOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("/", node, wr);
}
public bool VisitPowOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("**", node, wr);
}
public bool VisitLtOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("<", node, wr);
}
public bool VisitLeOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("<=", node, wr);
}
public bool VisitGtOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry(">", node, wr);
}
public bool VisitGeOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry(">=", node, wr);
}
public bool VisitSubtypeOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("<:", node, wr);
}
public bool VisitSubtype3Op(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("<::", node, wr);
}
public bool VisitToIntOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("int", node, wr);
}
public bool VisitToRealOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
return PrintNAry("real", node, wr);
}
public bool VisitBoogieFunctionOp(VCExprNAry node, TextWriter wr) {
//Contract.Requires(wr != null);
//Contract.Requires(node != null);
VCExprBoogieFunctionOp/*!*/ op = (VCExprBoogieFunctionOp)node.Op;
Contract.Assert(op != null);
return PrintNAry(op.Func.Name, node, wr);
}
}
}
|
