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
|
//===-- IncompleteSolver.cpp ----------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "klee/IncompleteSolver.h"
#include "klee/Constraints.h"
using namespace klee;
using namespace llvm;
/***/
IncompleteSolver::PartialValidity
IncompleteSolver::negatePartialValidity(PartialValidity pv) {
switch(pv) {
default: assert(0 && "invalid partial validity");
case MustBeTrue: return MustBeFalse;
case MustBeFalse: return MustBeTrue;
case MayBeTrue: return MayBeFalse;
case MayBeFalse: return MayBeTrue;
case TrueOrFalse: return TrueOrFalse;
}
}
IncompleteSolver::PartialValidity
IncompleteSolver::computeValidity(const Query& query) {
PartialValidity trueResult = computeTruth(query);
if (trueResult == MustBeTrue) {
return MustBeTrue;
} else {
PartialValidity falseResult = computeTruth(query.negateExpr());
if (falseResult == MustBeTrue) {
return MustBeFalse;
} else {
bool trueCorrect = trueResult != None,
falseCorrect = falseResult != None;
if (trueCorrect && falseCorrect) {
return TrueOrFalse;
} else if (trueCorrect) { // ==> trueResult == MayBeFalse
return MayBeFalse;
} else if (falseCorrect) { // ==> falseResult == MayBeFalse
return MayBeTrue;
} else {
return None;
}
}
}
}
/***/
StagedSolverImpl::StagedSolverImpl(IncompleteSolver *_primary,
Solver *_secondary)
: primary(_primary),
secondary(_secondary) {
}
StagedSolverImpl::~StagedSolverImpl() {
delete primary;
delete secondary;
}
bool StagedSolverImpl::computeTruth(const Query& query, bool &isValid) {
IncompleteSolver::PartialValidity trueResult = primary->computeTruth(query);
if (trueResult != IncompleteSolver::None) {
isValid = (trueResult == IncompleteSolver::MustBeTrue);
return true;
}
return secondary->impl->computeTruth(query, isValid);
}
bool StagedSolverImpl::computeValidity(const Query& query,
Solver::Validity &result) {
bool tmp;
switch(primary->computeValidity(query)) {
case IncompleteSolver::MustBeTrue:
result = Solver::True;
break;
case IncompleteSolver::MustBeFalse:
result = Solver::False;
break;
case IncompleteSolver::TrueOrFalse:
result = Solver::Unknown;
break;
case IncompleteSolver::MayBeTrue:
if (!secondary->impl->computeTruth(query, tmp))
return false;
result = tmp ? Solver::True : Solver::Unknown;
break;
case IncompleteSolver::MayBeFalse:
if (!secondary->impl->computeTruth(query.negateExpr(), tmp))
return false;
result = tmp ? Solver::False : Solver::Unknown;
break;
default:
if (!secondary->impl->computeValidity(query, result))
return false;
break;
}
return true;
}
bool StagedSolverImpl::computeValue(const Query& query,
ref<Expr> &result) {
if (primary->computeValue(query, result))
return true;
return secondary->impl->computeValue(query, result);
}
bool
StagedSolverImpl::computeInitialValues(const Query& query,
const std::vector<const Array*>
&objects,
std::vector< std::vector<unsigned char> >
&values,
bool &hasSolution) {
if (primary->computeInitialValues(query, objects, values, hasSolution))
return true;
return secondary->impl->computeInitialValues(query, objects, values,
hasSolution);
}
|
