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
|
/********************* */
/*! \file cnf_proof.cpp
** \verbatim
** Top contributors (to current version):
** Liana Hadarean, Andrew Reynolds, Alex Ozdemir
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
#include "proof/cnf_proof.h"
#include "proof/clause_id.h"
#include "proof/proof_manager.h"
#include "prop/cnf_stream.h"
#include "prop/minisat/minisat.h"
#include "prop/sat_solver_types.h"
namespace CVC4 {
CnfProof::CnfProof(prop::CnfStream* stream,
context::Context* ctx,
const std::string& name)
: d_cnfStream(stream)
, d_clauseToAssertion(ctx)
, d_currentAssertionStack()
, d_cnfDeps()
, d_name(name)
{
// Setting the proof object for the CnfStream
d_cnfStream->setProof(this);
}
CnfProof::~CnfProof() {}
Node CnfProof::getAssertionForClause(ClauseId clause) {
ClauseIdToNode::const_iterator it = d_clauseToAssertion.find(clause);
Assert(it != d_clauseToAssertion.end() && !(*it).second.isNull());
return (*it).second;
}
void CnfProof::registerConvertedClause(ClauseId clause)
{
Assert(clause != ClauseIdUndef && clause != ClauseIdError
&& clause != ClauseIdEmpty);
Node current_assertion = getCurrentAssertion();
Debug("proof:cnf") << "CnfProof::registerConvertedClause " << clause
<< " assertion = " << current_assertion << std::endl;
setClauseAssertion(clause, current_assertion);
}
void CnfProof::setClauseAssertion(ClauseId clause, Node expr) {
Debug("proof:cnf") << "CnfProof::setClauseAssertion "
<< clause << " assertion " << expr << std::endl;
// We can add the same clause from different assertions. In this
// case we keep the first assertion. For example asserting a /\ b
// and then b /\ c where b is an atom, would assert b twice (note
// that since b is top level, it is not cached by the CnfStream)
//
// Note: If the current assertion associated with the clause is null, we
// update it because it means that it was previously added the clause without
// associating it with an assertion.
const auto& it = d_clauseToAssertion.find(clause);
if (it != d_clauseToAssertion.end() && (*it).second != Node::null())
{
return;
}
d_clauseToAssertion.insert(clause, expr);
}
void CnfProof::pushCurrentAssertion(Node assertion, bool isInput)
{
Debug("proof:cnf") << "CnfProof::pushCurrentAssertion " << assertion
<< std::endl;
d_currentAssertionStack.push_back(std::pair<Node, bool>(assertion, isInput));
Debug("proof:cnf") << "CnfProof::pushCurrentAssertion "
<< "new stack size = " << d_currentAssertionStack.size()
<< std::endl;
}
void CnfProof::popCurrentAssertion() {
Assert(d_currentAssertionStack.size());
Debug("proof:cnf") << "CnfProof::popCurrentAssertion "
<< d_currentAssertionStack.back().first << std::endl;
d_currentAssertionStack.pop_back();
Debug("proof:cnf") << "CnfProof::popCurrentAssertion "
<< "new stack size = " << d_currentAssertionStack.size()
<< std::endl;
}
Node CnfProof::getCurrentAssertion() {
Assert(d_currentAssertionStack.size());
return d_currentAssertionStack.back().first;
}
bool CnfProof::getCurrentAssertionKind()
{
return d_currentAssertionStack.back().second;
}
} /* CVC4 namespace */
|