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
|
//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Microsoft.Contracts;
using Microsoft.Boogie.VCExprAST;
namespace Microsoft.Boogie
{
/// <summary>
/// The methods of this class are called in the following order:
/// DeclareType*
/// (DeclareConstant DeclareFunction)*
/// AddAxiom*
/// DeclareGlobalVariable*
/// At this time, all "attributes" are passed in as null.
/// </summary>
public abstract class ProverContext : ICloneable {
protected virtual void ProcessDeclaration(Declaration! decl) {}
public virtual void DeclareType(TypeCtorDecl! t, string attributes) { ProcessDeclaration(t); }
public virtual void DeclareConstant(Constant! c, bool uniq, string attributes) { ProcessDeclaration(c); }
public virtual void DeclareFunction(Function! f, string attributes) { ProcessDeclaration(f); }
public virtual void AddAxiom(Axiom! a, string attributes) { ProcessDeclaration(a); }
public abstract void AddAxiom(VCExpr! vc);
public virtual void DeclareGlobalVariable(GlobalVariable! v, string attributes) { ProcessDeclaration(v); }
public abstract VCExpressionGenerator! ExprGen { get; }
public abstract Boogie2VCExprTranslator! BoogieExprTranslator { get; }
public abstract VCGenerationOptions! VCGenOptions { get; }
public abstract object! Clone();
}
// -----------------------------------------------------------------------------------------------
// -----------------------------------------------------------------------------------------------
// -----------------------------------------------------------------------------------------------
/// <summary>
/// This ProverContext subclass is intended for use with untyped provers that do not require names
/// to be declared before use. It constructs its context from unique constants and given axioms.
/// </summary>
public class DeclFreeProverContext : ProverContext {
protected VCExpressionGenerator! gen;
protected VCGenerationOptions! genOptions;
protected Boogie2VCExprTranslator! translator;
protected OrderingAxiomBuilder! orderingAxiomBuilder;
StringBuilder! proverCommands;
StringBuilder! incrementalProverCommands;
protected List<Variable!>! distincts;
protected List<VCExpr!>! axiomConjuncts;
public VCExprTranslator exprTranslator;
public DeclFreeProverContext(VCExpressionGenerator! gen,
VCGenerationOptions! genOptions) {
this.gen = gen;
this.genOptions = genOptions;
Boogie2VCExprTranslator! t = new Boogie2VCExprTranslator (gen, genOptions);
this.translator = t;
OrderingAxiomBuilder! oab = new OrderingAxiomBuilder(gen, t);
oab.Setup();
this.orderingAxiomBuilder = oab;
proverCommands = new StringBuilder();
incrementalProverCommands = new StringBuilder();
distincts = new List<Variable!>();
axiomConjuncts = new List<VCExpr!>();
exprTranslator = null;
}
private DeclFreeProverContext(DeclFreeProverContext! ctxt) {
this.gen = ctxt.gen;
this.genOptions = ctxt.genOptions;
Boogie2VCExprTranslator! t = (Boogie2VCExprTranslator)ctxt.translator.Clone();
this.translator = t;
this.orderingAxiomBuilder = new OrderingAxiomBuilder(ctxt.gen, t, ctxt.orderingAxiomBuilder);
StringBuilder! cmds = new StringBuilder ();
cmds.Append(ctxt.proverCommands);
proverCommands = cmds;
StringBuilder! incCmds = new StringBuilder ();
incCmds.Append(ctxt.incrementalProverCommands);
incrementalProverCommands = incCmds;
distincts = new List<Variable!>(ctxt.distincts);
axiomConjuncts = new List<VCExpr!>(ctxt.axiomConjuncts);
if (ctxt.exprTranslator == null)
exprTranslator = null;
else
exprTranslator = (VCExprTranslator!)ctxt.exprTranslator.Clone();
}
public override object! Clone() {
return new DeclFreeProverContext(this);
}
internal protected void SayToProver(string! msg)
{
msg = msg + "\r\n";
proverCommands.Append(msg);
incrementalProverCommands.Append(msg);
}
protected override void ProcessDeclaration(Declaration! decl)
{
for (QKeyValue a = decl.Attributes; a != null; a = a.Next) {
if (a.Key == "prover" && a.Params.Count == 1) {
string cmd = a.Params[0] as string;
if (cmd != null) {
int pos = cmd.IndexOf(':');
if (pos <= 0)
throw new ProverException("Invalid syntax of :prover string: `" + cmd + "'");
string kind = cmd.Substring(0, pos);
if (genOptions.IsAnyProverCommandSupported(kind))
SayToProver(cmd.Substring(pos + 1));
}
}
}
}
public override void DeclareFunction(Function! f, string attributes) {
base.ProcessDeclaration(f);
}
public override void DeclareConstant(Constant! c, bool uniq, string attributes) {
base.DeclareConstant(c, uniq, attributes);
orderingAxiomBuilder.AddConstant(c);
// TODO: make separate distinct lists for names coming from different types
// e.g., one for strings, one for ints, one for program types.
if (uniq){
distincts.Add(c);
}
}
public override void AddAxiom(Axiom! ax, string attributes) {
base.AddAxiom(ax, attributes);
string ignore = ax.FindStringAttribute("ignore");
if (ignore != null && genOptions.IsAnyProverCommandSupported(ignore)) {
return;
}
axiomConjuncts.Add(translator.Translate(ax.Expr));
}
public override void AddAxiom(VCExpr! vc)
{
axiomConjuncts.Add(vc);
}
public VCExpr! Axioms {
get {
VCExpr axioms = gen.NAry(VCExpressionGenerator.AndOp, axiomConjuncts);
List<VCExpr!>! distinctVars = new List<VCExpr!> ();
foreach (Variable! v in distincts)
distinctVars.Add(translator.LookupVariable(v));
axioms = gen.AndSimp(gen.Distinct(distinctVars), axioms);
if (CommandLineOptions.Clo.TypeEncodingMethod != CommandLineOptions.TypeEncoding.Monomorphic)
axioms = gen.AndSimp(orderingAxiomBuilder.Axioms, axioms);
return axioms;
}
}
public string! GetProverCommands(bool full) {
string! res = (full ? proverCommands : incrementalProverCommands).ToString();
incrementalProverCommands.Length = 0;
return res;
}
public override VCExpressionGenerator! ExprGen { get {
return gen;
} }
public override Boogie2VCExprTranslator! BoogieExprTranslator { get {
return translator;
} }
public override VCGenerationOptions! VCGenOptions { get {
return genOptions;
} }
}
// Translator from VCExpressions to strings, which are implemented
// by the various provers
public abstract class VCExprTranslator : ICloneable {
public abstract string! translate(VCExpr! expr, int polarity);
public abstract string! Lookup(VCExprVar! var);
public abstract Object! Clone();
}
}
|
