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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/theory/strings/solver_state.cpp	Lines:	102	106	96.2 %
Date:	2021-08-16	Branches:	158	336	47.0 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andrew Reynolds, Tianyi Liang, Mathias Preiner
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 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.
 * ****************************************************************************
 *
 * Implementation of the solver state of the theory of strings.
 */

#include "theory/strings/solver_state.h"

#include "theory/rewriter.h"
#include "theory/strings/theory_strings_utils.h"
#include "theory/strings/word.h"
#include "util/rational.h"

using namespace std;
using namespace cvc5::context;
using namespace cvc5::kind;

namespace cvc5 {
namespace theory {
namespace strings {

SolverState::SolverState(context::Context* c,
                         context::UserContext* u,
                         Valuation& v)
    : TheoryState(c, u, v), d_eeDisequalities(c), d_pendingConflictSet(c, false), d_pendingConflict(InferenceId::UNKNOWN)
{
  d_zero = NodeManager::currentNM()->mkConst(Rational(0));
  d_false = NodeManager::currentNM()->mkConst(false);
}

SolverState::~SolverState()
{
  for (std::pair<const Node, EqcInfo*>& it : d_eqcInfo)
  {
    delete it.second;
  }
}

const context::CDList<Node>& SolverState::getDisequalityList() const
{
  return d_eeDisequalities;
}

void SolverState::addDisequality(TNode t1, TNode t2)
{
  d_eeDisequalities.push_back(t1.eqNode(t2));
}

EqcInfo* SolverState::getOrMakeEqcInfo(Node eqc, bool doMake)
{
  std::map<Node, EqcInfo*>::iterator eqc_i = d_eqcInfo.find(eqc);
  if (eqc_i != d_eqcInfo.end())
  {
    return eqc_i->second;
  }
  if (doMake)
  {
    EqcInfo* ei = new EqcInfo(d_context);
    d_eqcInfo[eqc] = ei;
    return ei;
  }
  return nullptr;
}

TheoryModel* SolverState::getModel() { return d_valuation.getModel(); }

Node SolverState::getLengthExp(Node t, std::vector<Node>& exp, Node te)
{
  Assert(areEqual(t, te));
  Node lt = utils::mkNLength(te);
  if (hasTerm(lt))
  {
    // use own length if it exists, leads to shorter explanation
    return lt;
  }
  EqcInfo* ei = getOrMakeEqcInfo(t, false);
  Node lengthTerm = ei ? ei->d_lengthTerm : Node::null();
  if (lengthTerm.isNull())
  {
    // typically shouldnt be necessary
    lengthTerm = t;
  }
  Debug("strings") << "SolverState::getLengthTerm " << t << " is " << lengthTerm
                   << std::endl;
  if (te != lengthTerm)
  {
    exp.push_back(te.eqNode(lengthTerm));
  }
  return Rewriter::rewrite(
      NodeManager::currentNM()->mkNode(STRING_LENGTH, lengthTerm));
}

Node SolverState::getLength(Node t, std::vector<Node>& exp)
{
  return getLengthExp(t, exp, t);
}

Node SolverState::explainNonEmpty(Node s)
{
  Assert(s.getType().isStringLike());
  Node emp = Word::mkEmptyWord(s.getType());
  if (areDisequal(s, emp))
  {
    return s.eqNode(emp).negate();
  }
  Node sLen = utils::mkNLength(s);
  if (areDisequal(sLen, d_zero))
  {
    return sLen.eqNode(d_zero).negate();
  }
  return Node::null();
}

bool SolverState::isEqualEmptyWord(Node s, Node& emps)
{
  Node sr = getRepresentative(s);
  if (sr.isConst())
  {
    if (Word::getLength(sr) == 0)
    {
      emps = sr;
      return true;
    }
  }
  return false;
}

void SolverState::setPendingPrefixConflictWhen(Node conf)
{
  if (conf.isNull() || d_pendingConflictSet.get())
  {
    return;
  }
  InferInfo iiPrefixConf(InferenceId::STRINGS_PREFIX_CONFLICT);
  iiPrefixConf.d_conc = d_false;
  utils::flattenOp(AND, conf, iiPrefixConf.d_premises);
  setPendingConflict(iiPrefixConf);
}

void SolverState::setPendingConflict(InferInfo& ii)
{
  if (!d_pendingConflictSet.get())
  {
    d_pendingConflict = ii;
    d_pendingConflictSet.set(true);
  }
}

bool SolverState::hasPendingConflict() const { return d_pendingConflictSet; }

bool SolverState::getPendingConflict(InferInfo& ii) const
{
  if (d_pendingConflictSet)
  {
    ii = d_pendingConflict;
    return true;
  }
  return false;
}

std::pair<bool, Node> SolverState::entailmentCheck(options::TheoryOfMode mode,
                                                   TNode lit)
{
  return d_valuation.entailmentCheck(mode, lit);
}

void SolverState::separateByLength(
    const std::vector<Node>& n,
    std::map<TypeNode, std::vector<std::vector<Node>>>& cols,
    std::map<TypeNode, std::vector<Node>>& lts)
{
  unsigned leqc_counter = 0;
  // map (length, type) to an equivalence class identifier
  std::map<std::pair<Node, TypeNode>, unsigned> eqc_to_leqc;
  // backwards map
  std::map<unsigned, std::pair<Node, TypeNode>> leqc_to_eqc;
  // Collection of eqc for each identifier. Notice that some identifiers may
  // not have an associated length in the mappings above, if the length of
  // an equivalence class is unknown.
  std::map<unsigned, std::vector<Node> > eqc_to_strings;
  NodeManager* nm = NodeManager::currentNM();
  for (const Node& eqc : n)
  {
    Assert(d_ee->getRepresentative(eqc) == eqc);
    TypeNode tnEqc = eqc.getType();
    EqcInfo* ei = getOrMakeEqcInfo(eqc, false);
    Node lt = ei ? ei->d_lengthTerm : Node::null();
    if (!lt.isNull())
    {
      lt = nm->mkNode(STRING_LENGTH, lt);
      Node r = d_ee->getRepresentative(lt);
      std::pair<Node, TypeNode> lkey(r, tnEqc);
      if (eqc_to_leqc.find(lkey) == eqc_to_leqc.end())
      {
        eqc_to_leqc[lkey] = leqc_counter;
        leqc_to_eqc[leqc_counter] = lkey;
        leqc_counter++;
      }
      eqc_to_strings[eqc_to_leqc[lkey]].push_back(eqc);
    }
    else
    {
      eqc_to_strings[leqc_counter].push_back(eqc);
      leqc_counter++;
    }
  }
  for (const std::pair<const unsigned, std::vector<Node> >& p : eqc_to_strings)
  {
    Assert(!p.second.empty());
    // get the type of the collection
    TypeNode stn = p.second[0].getType();
    cols[stn].emplace_back(p.second.begin(), p.second.end());
    lts[stn].push_back(leqc_to_eqc[p.first].first);
  }
}

}  // namespace strings
}  // namespace theory
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andrew Reynolds, Tianyi Liang, Mathias Preiner
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 solver state of the theory of strings.
14		*/
15
16		#include "theory/strings/solver_state.h"
17
18		#include "theory/rewriter.h"
19		#include "theory/strings/theory_strings_utils.h"
20		#include "theory/strings/word.h"
21		#include "util/rational.h"
22
23		using namespace std;
24		using namespace cvc5::context;
25		using namespace cvc5::kind;
26
27		namespace cvc5 {
28		namespace theory {
29		namespace strings {
30
31	9853	SolverState::SolverState(context::Context* c,
32		context::UserContext* u,
33	9853	Valuation& v)
34	9853	: TheoryState(c, u, v), d_eeDisequalities(c), d_pendingConflictSet(c, false), d_pendingConflict(InferenceId::UNKNOWN)
35		{
36	9853	d_zero = NodeManager::currentNM()->mkConst(Rational(0));
37	9853	d_false = NodeManager::currentNM()->mkConst(false);
38	9853	}
39
40	19706	SolverState::~SolverState()
41		{
42	37984	for (std::pair<const Node, EqcInfo*>& it : d_eqcInfo)
43		{
44	28131	delete it.second;
45		}
46	9853	}
47
48	11114	const context::CDList<Node>& SolverState::getDisequalityList() const
49		{
50	11114	return d_eeDisequalities;
51		}
52
53	73265	void SolverState::addDisequality(TNode t1, TNode t2)
54		{
55	73265	d_eeDisequalities.push_back(t1.eqNode(t2));
56	73265	}
57
58	1833754	EqcInfo* SolverState::getOrMakeEqcInfo(Node eqc, bool doMake)
59		{
60	1833754	std::map<Node, EqcInfo*>::iterator eqc_i = d_eqcInfo.find(eqc);
61	1833754	if (eqc_i != d_eqcInfo.end())
62		{
63	854142	return eqc_i->second;
64		}
65	979612	if (doMake)
66		{
67	28131	EqcInfo* ei = new EqcInfo(d_context);
68	28131	d_eqcInfo[eqc] = ei;
69	28131	return ei;
70		}
71	951481	return nullptr;
72		}
73
74		TheoryModel* SolverState::getModel() { return d_valuation.getModel(); }
75
76	597640	Node SolverState::getLengthExp(Node t, std::vector<Node>& exp, Node te)
77		{
78	597640	Assert(areEqual(t, te));
79	1195280	Node lt = utils::mkNLength(te);
80	597640	if (hasTerm(lt))
81		{
82		// use own length if it exists, leads to shorter explanation
83	595200	return lt;
84		}
85	2440	EqcInfo* ei = getOrMakeEqcInfo(t, false);
86	4880	Node lengthTerm = ei ? ei->d_lengthTerm : Node::null();
87	2440	if (lengthTerm.isNull())
88		{
89		// typically shouldnt be necessary
90	2398	lengthTerm = t;
91		}
92	4880	Debug("strings") << "SolverState::getLengthTerm " << t << " is " << lengthTerm
93	2440	<< std::endl;
94	2440	if (te != lengthTerm)
95		{
96	42	exp.push_back(te.eqNode(lengthTerm));
97		}
98		return Rewriter::rewrite(
99	2440	NodeManager::currentNM()->mkNode(STRING_LENGTH, lengthTerm));
100		}
101
102	597636	Node SolverState::getLength(Node t, std::vector<Node>& exp)
103		{
104	597636	return getLengthExp(t, exp, t);
105		}
106
107	14473	Node SolverState::explainNonEmpty(Node s)
108		{
109	14473	Assert(s.getType().isStringLike());
110	28946	Node emp = Word::mkEmptyWord(s.getType());
111	14473	if (areDisequal(s, emp))
112		{
113	6334	return s.eqNode(emp).negate();
114		}
115	16278	Node sLen = utils::mkNLength(s);
116	8139	if (areDisequal(sLen, d_zero))
117		{
118	8123	return sLen.eqNode(d_zero).negate();
119		}
120	16	return Node::null();
121		}
122
123	718958	bool SolverState::isEqualEmptyWord(Node s, Node& emps)
124		{
125	1437916	Node sr = getRepresentative(s);
126	718958	if (sr.isConst())
127		{
128	198721	if (Word::getLength(sr) == 0)
129		{
130	29762	emps = sr;
131	29762	return true;
132		}
133		}
134	689196	return false;
135		}
136
137	93460	void SolverState::setPendingPrefixConflictWhen(Node conf)
138		{
139	93460	if (conf.isNull() \|\| d_pendingConflictSet.get())
140		{
141	92967	return;
142		}
143	986	InferInfo iiPrefixConf(InferenceId::STRINGS_PREFIX_CONFLICT);
144	493	iiPrefixConf.d_conc = d_false;
145	493	utils::flattenOp(AND, conf, iiPrefixConf.d_premises);
146	493	setPendingConflict(iiPrefixConf);
147		}
148
149	493	void SolverState::setPendingConflict(InferInfo& ii)
150		{
151	493	if (!d_pendingConflictSet.get())
152		{
153	493	d_pendingConflict = ii;
154	493	d_pendingConflictSet.set(true);
155		}
156	493	}
157
158	943334	bool SolverState::hasPendingConflict() const { return d_pendingConflictSet; }
159
160	420	bool SolverState::getPendingConflict(InferInfo& ii) const
161		{
162	420	if (d_pendingConflictSet)
163		{
164	420	ii = d_pendingConflict;
165	420	return true;
166		}
167		return false;
168		}
169
170	6549	std::pair<bool, Node> SolverState::entailmentCheck(options::TheoryOfMode mode,
171		TNode lit)
172		{
173	6549	return d_valuation.entailmentCheck(mode, lit);
174		}
175
176	19608	void SolverState::separateByLength(
177		const std::vector<Node>& n,
178		std::map<TypeNode, std::vector<std::vector<Node>>>& cols,
179		std::map<TypeNode, std::vector<Node>>& lts)
180		{
181	19608	unsigned leqc_counter = 0;
182		// map (length, type) to an equivalence class identifier
183	39216	std::map<std::pair<Node, TypeNode>, unsigned> eqc_to_leqc;
184		// backwards map
185	39216	std::map<unsigned, std::pair<Node, TypeNode>> leqc_to_eqc;
186		// Collection of eqc for each identifier. Notice that some identifiers may
187		// not have an associated length in the mappings above, if the length of
188		// an equivalence class is unknown.
189	39216	std::map<unsigned, std::vector<Node> > eqc_to_strings;
190	19608	NodeManager* nm = NodeManager::currentNM();
191	80421	for (const Node& eqc : n)
192		{
193	60813	Assert(d_ee->getRepresentative(eqc) == eqc);
194	121626	TypeNode tnEqc = eqc.getType();
195	60813	EqcInfo* ei = getOrMakeEqcInfo(eqc, false);
196	121626	Node lt = ei ? ei->d_lengthTerm : Node::null();
197	60813	if (!lt.isNull())
198		{
199	60813	lt = nm->mkNode(STRING_LENGTH, lt);
200	121626	Node r = d_ee->getRepresentative(lt);
201	121626	std::pair<Node, TypeNode> lkey(r, tnEqc);
202	60813	if (eqc_to_leqc.find(lkey) == eqc_to_leqc.end())
203		{
204	40133	eqc_to_leqc[lkey] = leqc_counter;
205	40133	leqc_to_eqc[leqc_counter] = lkey;
206	40133	leqc_counter++;
207		}
208	60813	eqc_to_strings[eqc_to_leqc[lkey]].push_back(eqc);
209		}
210		else
211		{
212		eqc_to_strings[leqc_counter].push_back(eqc);
213		leqc_counter++;
214		}
215		}
216	59741	for (const std::pair<const unsigned, std::vector<Node> >& p : eqc_to_strings)
217		{
218	40133	Assert(!p.second.empty());
219		// get the type of the collection
220	80266	TypeNode stn = p.second[0].getType();
221	40133	cols[stn].emplace_back(p.second.begin(), p.second.end());
222	40133	lts[stn].push_back(leqc_to_eqc[p.first].first);
223		}
224	19608	}
225
226		} // namespace strings
227		} // namespace theory
228	29340	} // namespace cvc5