1 |
|
/****************************************************************************** |
2 |
|
* Top contributors (to current version): |
3 |
|
* Haniel Barbosa |
4 |
|
* |
5 |
|
* This file is part of the cvc5 project. |
6 |
|
* |
7 |
|
* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
8 |
|
* in the top-level source directory and their institutional affiliations. |
9 |
|
* All rights reserved. See the file COPYING in the top-level source |
10 |
|
* directory for licensing information. |
11 |
|
* **************************************************************************** |
12 |
|
* |
13 |
|
* Implementation of the proof manager for the PropPfManager. |
14 |
|
*/ |
15 |
|
|
16 |
|
#include "prop/prop_proof_manager.h" |
17 |
|
|
18 |
|
#include "proof/proof_ensure_closed.h" |
19 |
|
#include "proof/proof_node_algorithm.h" |
20 |
|
#include "prop/prop_proof_manager.h" |
21 |
|
#include "prop/sat_solver.h" |
22 |
|
|
23 |
|
namespace cvc5 { |
24 |
|
namespace prop { |
25 |
|
|
26 |
1254 |
PropPfManager::PropPfManager(context::UserContext* userContext, |
27 |
|
ProofNodeManager* pnm, |
28 |
|
CDCLTSatSolverInterface* satSolver, |
29 |
1254 |
ProofCnfStream* cnfProof) |
30 |
|
: d_pnm(pnm), |
31 |
1254 |
d_pfpp(new ProofPostproccess(pnm, cnfProof)), |
32 |
|
d_satSolver(satSolver), |
33 |
2508 |
d_assertions(userContext) |
34 |
|
{ |
35 |
|
// add trivial assumption. This is so that we can check the that the prop |
36 |
|
// engine's proof is closed, as the SAT solver's refutation proof may use True |
37 |
|
// as an assumption even when True is not given as an assumption. An example |
38 |
|
// is when a propagated literal has an empty explanation (i.e., it is a valid |
39 |
|
// literal), which leads to adding True as its explanation, since for creating |
40 |
|
// a learned clause we need at least two literals. |
41 |
1254 |
d_assertions.push_back(NodeManager::currentNM()->mkConst(true)); |
42 |
1254 |
} |
43 |
|
|
44 |
19904 |
void PropPfManager::registerAssertion(Node assertion) |
45 |
|
{ |
46 |
19904 |
d_assertions.push_back(assertion); |
47 |
19904 |
} |
48 |
|
|
49 |
|
void PropPfManager::checkProof(context::CDList<Node>* assertions) |
50 |
|
{ |
51 |
|
Trace("sat-proof") << "PropPfManager::checkProof: Checking if resolution " |
52 |
|
"proof of false is closed\n"; |
53 |
|
std::shared_ptr<ProofNode> conflictProof = d_satSolver->getProof(); |
54 |
|
Assert(conflictProof); |
55 |
|
// connect it with CNF proof |
56 |
|
d_pfpp->process(conflictProof); |
57 |
|
// add given assertions d_assertions |
58 |
|
for (const Node& assertion : *assertions) |
59 |
|
{ |
60 |
|
d_assertions.push_back(assertion); |
61 |
|
} |
62 |
|
std::vector<Node> avec{d_assertions.begin(), d_assertions.end()}; |
63 |
|
pfnEnsureClosedWrt( |
64 |
|
conflictProof.get(), avec, "sat-proof", "PropPfManager::checkProof"); |
65 |
|
} |
66 |
|
|
67 |
2811 |
std::shared_ptr<ProofNode> PropPfManager::getProof() |
68 |
|
{ |
69 |
|
// retrieve the SAT solver's refutation proof |
70 |
5622 |
Trace("sat-proof") |
71 |
2811 |
<< "PropPfManager::getProof: Getting resolution proof of false\n"; |
72 |
2811 |
std::shared_ptr<ProofNode> conflictProof = d_satSolver->getProof(); |
73 |
2811 |
Assert(conflictProof); |
74 |
2811 |
if (Trace.isOn("sat-proof")) |
75 |
|
{ |
76 |
|
std::vector<Node> fassumps; |
77 |
|
expr::getFreeAssumptions(conflictProof.get(), fassumps); |
78 |
|
Trace("sat-proof") |
79 |
|
<< "PropPfManager::getProof: initial free assumptions are:\n"; |
80 |
|
for (const Node& a : fassumps) |
81 |
|
{ |
82 |
|
Trace("sat-proof") << "- " << a << "\n"; |
83 |
|
} |
84 |
|
Trace("sat-proof-debug") |
85 |
|
<< "PropPfManager::getProof: proof is " << *conflictProof.get() << "\n"; |
86 |
|
Trace("sat-proof") |
87 |
|
<< "PropPfManager::getProof: Connecting with CNF proof\n"; |
88 |
|
} |
89 |
|
// connect it with CNF proof |
90 |
2811 |
d_pfpp->process(conflictProof); |
91 |
2811 |
if (Trace.isOn("sat-proof")) |
92 |
|
{ |
93 |
|
std::vector<Node> fassumps; |
94 |
|
expr::getFreeAssumptions(conflictProof.get(), fassumps); |
95 |
|
Trace("sat-proof") |
96 |
|
<< "PropPfManager::getProof: new free assumptions are:\n"; |
97 |
|
for (const Node& a : fassumps) |
98 |
|
{ |
99 |
|
Trace("sat-proof") << "- " << a << "\n"; |
100 |
|
} |
101 |
|
Trace("sat-proof") << "PropPfManager::getProof: assertions are:\n"; |
102 |
|
for (const Node& a : d_assertions) |
103 |
|
{ |
104 |
|
Trace("sat-proof") << "- " << a << "\n"; |
105 |
|
} |
106 |
|
Trace("sat-proof-debug") |
107 |
|
<< "PropPfManager::getProof: proof is " << *conflictProof.get() << "\n"; |
108 |
|
} |
109 |
2811 |
return conflictProof; |
110 |
|
} |
111 |
|
|
112 |
|
} // namespace prop |
113 |
29340 |
} // namespace cvc5 |