1 /********************* */
2 /*! \file theory_engine.cpp
4 ** Top contributors (to current version):
5 ** Dejan Jovanovic, Andrew Reynolds, Morgan Deters
6 ** This file is part of the CVC4 project.
7 ** Copyright (c) 2009-2020 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.\endverbatim
12 ** \brief The theory engine
17 #include "theory/theory_engine.h"
22 #include "base/map_util.h"
23 #include "decision/decision_engine.h"
24 #include "expr/attribute.h"
25 #include "expr/node.h"
26 #include "expr/node_algorithm.h"
27 #include "expr/node_builder.h"
28 #include "expr/node_visitor.h"
29 #include "options/bv_options.h"
30 #include "options/options.h"
31 #include "options/proof_options.h"
32 #include "options/quantifiers_options.h"
33 #include "options/theory_options.h"
34 #include "preprocessing/assertion_pipeline.h"
35 #include "proof/cnf_proof.h"
36 #include "proof/lemma_proof.h"
37 #include "proof/proof_manager.h"
38 #include "proof/theory_proof.h"
39 #include "smt/logic_exception.h"
40 #include "smt/term_formula_removal.h"
41 #include "theory/arith/arith_ite_utils.h"
42 #include "theory/bv/theory_bv_utils.h"
43 #include "theory/care_graph.h"
44 #include "theory/quantifiers/first_order_model.h"
45 #include "theory/quantifiers/fmf/model_engine.h"
46 #include "theory/quantifiers/theory_quantifiers.h"
47 #include "theory/quantifiers_engine.h"
48 #include "theory/rewriter.h"
49 #include "theory/theory.h"
50 #include "theory/theory_model.h"
51 #include "theory/theory_traits.h"
52 #include "theory/uf/equality_engine.h"
53 #include "util/resource_manager.h"
57 using namespace CVC4::preprocessing
;
58 using namespace CVC4::theory
;
62 /* -------------------------------------------------------------------------- */
67 * IMPORTANT: The order of the theories is important. For example, strings
68 * depends on arith, quantifiers needs to come as the very last.
69 * Do not change this order.
72 #define CVC4_FOR_EACH_THEORY \
73 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_BUILTIN) \
74 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_BOOL) \
75 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_UF) \
76 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_ARITH) \
77 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_BV) \
78 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_FP) \
79 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_ARRAYS) \
80 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_DATATYPES) \
81 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_SEP) \
82 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_SETS) \
83 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_STRINGS) \
84 CVC4_FOR_EACH_THEORY_STATEMENT(CVC4::theory::THEORY_QUANTIFIERS)
88 /* -------------------------------------------------------------------------- */
90 inline void flattenAnd(Node n
, std::vector
<TNode
>& out
){
91 Assert(n
.getKind() == kind::AND
);
92 for(Node::iterator i
=n
.begin(), i_end
=n
.end(); i
!= i_end
; ++i
){
94 if(curr
.getKind() == kind::AND
){
95 flattenAnd(curr
, out
);
102 inline Node
flattenAnd(Node n
){
103 std::vector
<TNode
> out
;
105 return NodeManager::currentNM()->mkNode(kind::AND
, out
);
109 * Compute the string for a given theory id. In this module, we use
110 * THEORY_SAT_SOLVER as an id, which is not a normal id but maps to
111 * THEORY_LAST. Thus, we need our own string conversion here.
113 * @param id The theory id
114 * @return The string corresponding to the theory id
116 std::string
getTheoryString(theory::TheoryId id
)
118 if (id
== theory::THEORY_SAT_SOLVER
)
120 return "THEORY_SAT_SOLVER";
124 std::stringstream ss
;
130 void TheoryEngine::finishInit() {
131 //initialize the quantifiers engine, master equality engine, model, model builder
132 if( d_logicInfo
.isQuantified() ) {
133 // initialize the quantifiers engine
134 d_quantEngine
= new QuantifiersEngine(d_context
, d_userContext
, this);
135 Assert(d_masterEqualityEngine
== 0);
136 d_masterEqualityEngine
= new eq::EqualityEngine(d_masterEENotify
,getSatContext(), "theory::master", false);
138 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
!= theory::THEORY_LAST
; ++ theoryId
) {
139 if (d_theoryTable
[theoryId
]) {
140 d_theoryTable
[theoryId
]->setQuantifiersEngine(d_quantEngine
);
141 d_theoryTable
[theoryId
]->setMasterEqualityEngine(d_masterEqualityEngine
);
145 d_curr_model_builder
= d_quantEngine
->getModelBuilder();
146 d_curr_model
= d_quantEngine
->getModel();
148 d_curr_model
= new theory::TheoryModel(
149 d_userContext
, "DefaultModel", options::assignFunctionValues());
150 d_aloc_curr_model
= true;
152 //make the default builder, e.g. in the case that the quantifiers engine does not have a model builder
153 if( d_curr_model_builder
==NULL
){
154 d_curr_model_builder
= new theory::TheoryEngineModelBuilder(this);
155 d_aloc_curr_model_builder
= true;
158 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
!= theory::THEORY_LAST
; ++ theoryId
) {
159 if (d_theoryTable
[theoryId
]) {
160 // set the decision manager for the theory
161 d_theoryTable
[theoryId
]->setDecisionManager(d_decManager
.get());
162 // finish initializing the theory
163 d_theoryTable
[theoryId
]->finishInit();
168 void TheoryEngine::eqNotifyNewClass(TNode t
){
169 if (d_logicInfo
.isQuantified()) {
170 d_quantEngine
->eqNotifyNewClass( t
);
174 TheoryEngine::TheoryEngine(context::Context
* context
,
175 context::UserContext
* userContext
,
177 RemoveTermFormulas
& iteRemover
,
178 const LogicInfo
& logicInfo
)
179 : d_propEngine(nullptr),
181 d_userContext(userContext
),
182 d_logicInfo(logicInfo
),
183 d_sharedTerms(this, context
),
184 d_masterEqualityEngine(nullptr),
185 d_masterEENotify(*this),
186 d_quantEngine(nullptr),
187 d_decManager(new DecisionManager(userContext
)),
188 d_curr_model(nullptr),
189 d_aloc_curr_model(false),
190 d_curr_model_builder(nullptr),
191 d_aloc_curr_model_builder(false),
192 d_eager_model_building(false),
193 d_possiblePropagations(context
),
194 d_hasPropagated(context
),
195 d_inConflict(context
, false),
197 d_hasShutDown(false),
198 d_incomplete(context
, false),
199 d_propagationMap(context
),
200 d_propagationMapTimestamp(context
, 0),
201 d_propagatedLiterals(context
),
202 d_propagatedLiteralsIndex(context
, 0),
203 d_atomRequests(context
),
204 d_tpp(*this, iteRemover
),
205 d_combineTheoriesTime("TheoryEngine::combineTheoriesTime"),
208 d_interrupted(false),
209 d_resourceManager(rm
),
210 d_inPreregister(false),
211 d_factsAsserted(context
, false),
212 d_preRegistrationVisitor(this, context
),
213 d_sharedTermsVisitor(d_sharedTerms
),
215 d_arithSubstitutionsAdded("theory::arith::zzz::arith::substitutions", 0)
217 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
!= theory::THEORY_LAST
;
220 d_theoryTable
[theoryId
] = NULL
;
221 d_theoryOut
[theoryId
] = NULL
;
224 smtStatisticsRegistry()->registerStat(&d_combineTheoriesTime
);
225 d_true
= NodeManager::currentNM()->mkConst
<bool>(true);
226 d_false
= NodeManager::currentNM()->mkConst
<bool>(false);
229 ProofManager::currentPM()->initTheoryProofEngine();
232 smtStatisticsRegistry()->registerStat(&d_arithSubstitutionsAdded
);
235 TheoryEngine::~TheoryEngine() {
236 Assert(d_hasShutDown
);
238 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
!= theory::THEORY_LAST
; ++ theoryId
) {
239 if(d_theoryTable
[theoryId
] != NULL
) {
240 delete d_theoryTable
[theoryId
];
241 delete d_theoryOut
[theoryId
];
245 if( d_aloc_curr_model_builder
){
246 delete d_curr_model_builder
;
248 if( d_aloc_curr_model
){
252 delete d_quantEngine
;
254 delete d_masterEqualityEngine
;
256 smtStatisticsRegistry()->unregisterStat(&d_combineTheoriesTime
);
257 smtStatisticsRegistry()->unregisterStat(&d_arithSubstitutionsAdded
);
260 void TheoryEngine::interrupt() { d_interrupted
= true; }
261 void TheoryEngine::preRegister(TNode preprocessed
) {
263 Debug("theory") << "TheoryEngine::preRegister( " << preprocessed
<< ")" << std::endl
;
264 if(Dump
.isOn("missed-t-propagations")) {
265 d_possiblePropagations
.push_back(preprocessed
);
267 d_preregisterQueue
.push(preprocessed
);
269 if (!d_inPreregister
) {
270 // We're in pre-register
271 d_inPreregister
= true;
273 // Process the pre-registration queue
274 while (!d_preregisterQueue
.empty()) {
275 // Get the next atom to pre-register
276 preprocessed
= d_preregisterQueue
.front();
277 d_preregisterQueue
.pop();
279 if (d_logicInfo
.isSharingEnabled() && preprocessed
.getKind() == kind::EQUAL
) {
280 // When sharing is enabled, we propagate from the shared terms manager also
281 d_sharedTerms
.addEqualityToPropagate(preprocessed
);
284 // the atom should not have free variables
285 Debug("theory") << "TheoryEngine::preRegister: " << preprocessed
287 Assert(!expr::hasFreeVar(preprocessed
));
288 // Pre-register the terms in the atom
289 Theory::Set theories
= NodeVisitor
<PreRegisterVisitor
>::run(d_preRegistrationVisitor
, preprocessed
);
290 theories
= Theory::setRemove(THEORY_BOOL
, theories
);
291 // Remove the top theory, if any more that means multiple theories were involved
292 bool multipleTheories
= Theory::setRemove(Theory::theoryOf(preprocessed
), theories
);
294 // These checks don't work with finite model finding, because it
295 // uses Rational constants to represent cardinality constraints,
296 // even though arithmetic isn't actually involved.
297 if(!options::finiteModelFind()) {
298 while((i
= Theory::setPop(theories
)) != THEORY_LAST
) {
299 if(!d_logicInfo
.isTheoryEnabled(i
)) {
300 LogicInfo newLogicInfo
= d_logicInfo
.getUnlockedCopy();
301 newLogicInfo
.enableTheory(i
);
304 ss
<< "The logic was specified as " << d_logicInfo
.getLogicString()
305 << ", which doesn't include " << i
306 << ", but found a term in that theory." << endl
307 << "You might want to extend your logic to "
308 << newLogicInfo
.getLogicString() << endl
;
309 throw LogicException(ss
.str());
313 if (multipleTheories
) {
314 // Collect the shared terms if there are multiple theories
315 NodeVisitor
<SharedTermsVisitor
>::run(d_sharedTermsVisitor
, preprocessed
);
319 // Leaving pre-register
320 d_inPreregister
= false;
324 void TheoryEngine::printAssertions(const char* tag
) {
325 if (Trace
.isOn(tag
)) {
327 for (TheoryId theoryId
= THEORY_FIRST
; theoryId
< THEORY_LAST
; ++theoryId
) {
328 Theory
* theory
= d_theoryTable
[theoryId
];
329 if (theory
&& d_logicInfo
.isTheoryEnabled(theoryId
)) {
330 Trace(tag
) << "--------------------------------------------" << endl
;
331 Trace(tag
) << "Assertions of " << theory
->getId() << ": " << endl
;
333 context::CDList
<Assertion
>::const_iterator it
= theory
->facts_begin(),
336 for (unsigned i
= 0; it
!= it_end
; ++it
, ++i
)
338 if ((*it
).d_isPreregistered
)
340 Trace(tag
) << "[" << i
<< "]: ";
344 Trace(tag
) << "(" << i
<< "): ";
346 Trace(tag
) << (*it
).d_assertion
<< endl
;
350 if (d_logicInfo
.isSharingEnabled()) {
351 Trace(tag
) << "Shared terms of " << theory
->getId() << ": " << endl
;
352 context::CDList
<TNode
>::const_iterator it
= theory
->shared_terms_begin(), it_end
= theory
->shared_terms_end();
353 for (unsigned i
= 0; it
!= it_end
; ++ it
, ++i
) {
354 Trace(tag
) << "[" << i
<< "]: " << (*it
) << endl
;
362 void TheoryEngine::dumpAssertions(const char* tag
) {
363 if (Dump
.isOn(tag
)) {
364 Dump(tag
) << CommentCommand("Starting completeness check");
365 for (TheoryId theoryId
= THEORY_FIRST
; theoryId
< THEORY_LAST
; ++theoryId
) {
366 Theory
* theory
= d_theoryTable
[theoryId
];
367 if (theory
&& d_logicInfo
.isTheoryEnabled(theoryId
)) {
368 Dump(tag
) << CommentCommand("Completeness check");
369 Dump(tag
) << PushCommand();
371 // Dump the shared terms
372 if (d_logicInfo
.isSharingEnabled()) {
373 Dump(tag
) << CommentCommand("Shared terms");
374 context::CDList
<TNode
>::const_iterator it
= theory
->shared_terms_begin(), it_end
= theory
->shared_terms_end();
375 for (unsigned i
= 0; it
!= it_end
; ++ it
, ++i
) {
378 Dump(tag
) << CommentCommand(ss
.str());
382 // Dump the assertions
383 Dump(tag
) << CommentCommand("Assertions");
384 context::CDList
<Assertion
>::const_iterator it
= theory
->facts_begin(), it_end
= theory
->facts_end();
385 for (; it
!= it_end
; ++ it
) {
387 Node assertionNode
= (*it
).d_assertion
;
388 // Purify all the terms
390 if ((*it
).d_isPreregistered
)
392 Dump(tag
) << CommentCommand("Preregistered");
396 Dump(tag
) << CommentCommand("Shared assertion");
398 Dump(tag
) << AssertCommand(assertionNode
.toExpr());
400 Dump(tag
) << CheckSatCommand();
402 Dump(tag
) << PopCommand();
409 * Check all (currently-active) theories for conflicts.
410 * @param effort the effort level to use
412 void TheoryEngine::check(Theory::Effort effort
) {
415 // Reset the interrupt flag
416 d_interrupted
= false;
418 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
419 #undef CVC4_FOR_EACH_THEORY_STATEMENT
421 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
422 if (theory::TheoryTraits<THEORY>::hasCheck && d_logicInfo.isTheoryEnabled(THEORY)) { \
423 theoryOf(THEORY)->check(effort); \
424 if (d_inConflict) { \
425 Debug("conflict") << THEORY << " in conflict. " << std::endl; \
433 // Mark the output channel unused (if this is FULL_EFFORT, and nothing
434 // is done by the theories, no additional check will be needed)
435 d_outputChannelUsed
= false;
437 // Mark the lemmas flag (no lemmas added)
438 d_lemmasAdded
= false;
440 Debug("theory") << "TheoryEngine::check(" << effort
<< "): d_factsAsserted = " << (d_factsAsserted
? "true" : "false") << endl
;
442 // If in full effort, we have a fake new assertion just to jumpstart the checking
443 if (Theory::fullEffort(effort
)) {
444 d_factsAsserted
= true;
448 while (d_factsAsserted
&& !d_inConflict
&& !d_lemmasAdded
) {
450 Debug("theory") << "TheoryEngine::check(" << effort
<< "): running check" << endl
;
452 Trace("theory::assertions") << endl
;
453 if (Trace
.isOn("theory::assertions")) {
454 printAssertions("theory::assertions");
457 if(Theory::fullEffort(effort
)) {
458 Trace("theory::assertions::fulleffort") << endl
;
459 if (Trace
.isOn("theory::assertions::fulleffort")) {
460 printAssertions("theory::assertions::fulleffort");
464 // Note that we've discharged all the facts
465 d_factsAsserted
= false;
468 CVC4_FOR_EACH_THEORY
;
470 if(Dump
.isOn("missed-t-conflicts")) {
471 Dump("missed-t-conflicts")
472 << CommentCommand("Completeness check for T-conflicts; expect sat")
473 << CheckSatCommand();
476 Debug("theory") << "TheoryEngine::check(" << effort
<< "): running propagation after the initial check" << endl
;
478 // We are still satisfiable, propagate as much as possible
481 // We do combination if all has been processed and we are in fullcheck
482 if (Theory::fullEffort(effort
) && d_logicInfo
.isSharingEnabled() && !d_factsAsserted
&& !d_lemmasAdded
&& !d_inConflict
) {
483 // Do the combination
484 Debug("theory") << "TheoryEngine::check(" << effort
<< "): running combination" << endl
;
486 if(d_logicInfo
.isQuantified()){
487 d_quantEngine
->notifyCombineTheories();
492 // Must consult quantifiers theory for last call to ensure sat, or otherwise add a lemma
493 if( Theory::fullEffort(effort
) && ! d_inConflict
&& ! needCheck() ) {
494 Trace("theory::assertions-model") << endl
;
495 if (Trace
.isOn("theory::assertions-model")) {
496 printAssertions("theory::assertions-model");
498 //checks for theories requiring the model go at last call
499 d_curr_model
->reset();
500 for (TheoryId theoryId
= THEORY_FIRST
; theoryId
< THEORY_LAST
; ++theoryId
) {
501 if( theoryId
!=THEORY_QUANTIFIERS
){
502 Theory
* theory
= d_theoryTable
[theoryId
];
503 if (theory
&& d_logicInfo
.isTheoryEnabled(theoryId
)) {
504 if( theory
->needsCheckLastEffort() ){
505 if( !d_curr_model
->isBuilt() ){
506 if( !d_curr_model_builder
->buildModel(d_curr_model
) ){
510 theory
->check(Theory::EFFORT_LAST_CALL
);
517 if(d_logicInfo
.isQuantified()) {
518 // quantifiers engine must check at last call effort
519 d_quantEngine
->check(Theory::EFFORT_LAST_CALL
);
522 if (!d_inConflict
&& !needCheck())
524 // If d_eager_model_building is false, then we only mark that we
525 // are in "SAT mode". We build the model later only if the user asks
526 // for it via getBuiltModel.
528 if (d_eager_model_building
&& !d_curr_model
->isBuilt())
530 d_curr_model_builder
->buildModel(d_curr_model
);
535 Debug("theory") << "TheoryEngine::check(" << effort
<< "): done, we are " << (d_inConflict
? "unsat" : "sat") << (d_lemmasAdded
? " with new lemmas" : " with no new lemmas");
536 Debug("theory") << ", need check = " << (needCheck() ? "YES" : "NO") << endl
;
538 if( Theory::fullEffort(effort
) && !d_inConflict
&& !needCheck()) {
539 // case where we are about to answer SAT
540 if( d_masterEqualityEngine
!= NULL
){
541 AlwaysAssert(d_masterEqualityEngine
->consistent());
543 if (d_curr_model
->isBuilt())
545 // model construction should always succeed unless lemmas were added
546 AlwaysAssert(d_curr_model
->isBuiltSuccess());
547 if (options::produceModels())
549 // Do post-processing of model from the theories (used for THEORY_SEP
550 // to construct heap model)
551 postProcessModel(d_curr_model
);
552 // also call the model builder's post-process model
553 d_curr_model_builder
->postProcessModel(d_incomplete
.get(),
558 } catch(const theory::Interrupted
&) {
559 Trace("theory") << "TheoryEngine::check() => interrupted" << endl
;
561 // If fulleffort, check all theories
562 if(Dump
.isOn("theory::fullcheck") && Theory::fullEffort(effort
)) {
563 if (!d_inConflict
&& !needCheck()) {
564 dumpAssertions("theory::fullcheck");
569 void TheoryEngine::combineTheories() {
571 Trace("combineTheories") << "TheoryEngine::combineTheories()" << endl
;
573 TimerStat::CodeTimer
combineTheoriesTimer(d_combineTheoriesTime
);
575 // Care graph we'll be building
578 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
579 #undef CVC4_FOR_EACH_THEORY_STATEMENT
581 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
582 if (theory::TheoryTraits<THEORY>::isParametric && d_logicInfo.isTheoryEnabled(THEORY)) { \
583 theoryOf(THEORY)->getCareGraph(&careGraph); \
586 // Call on each parametric theory to give us its care graph
587 CVC4_FOR_EACH_THEORY
;
589 Trace("combineTheories") << "TheoryEngine::combineTheories(): care graph size = " << careGraph
.size() << endl
;
591 // Now add splitters for the ones we are interested in
592 CareGraph::const_iterator care_it
= careGraph
.begin();
593 CareGraph::const_iterator care_it_end
= careGraph
.end();
595 for (; care_it
!= care_it_end
; ++ care_it
) {
596 const CarePair
& carePair
= *care_it
;
598 Debug("combineTheories")
599 << "TheoryEngine::combineTheories(): checking " << carePair
.d_a
<< " = "
600 << carePair
.d_b
<< " from " << carePair
.d_theory
<< endl
;
602 Assert(d_sharedTerms
.isShared(carePair
.d_a
) || carePair
.d_a
.isConst());
603 Assert(d_sharedTerms
.isShared(carePair
.d_b
) || carePair
.d_b
.isConst());
605 // The equality in question (order for no repetition)
606 Node equality
= carePair
.d_a
.eqNode(carePair
.d_b
);
607 // EqualityStatus es = getEqualityStatus(carePair.d_a, carePair.d_b);
608 // Debug("combineTheories") << "TheoryEngine::combineTheories(): " <<
609 // (es == EQUALITY_TRUE_AND_PROPAGATED ? "EQUALITY_TRUE_AND_PROPAGATED" :
610 // es == EQUALITY_FALSE_AND_PROPAGATED ? "EQUALITY_FALSE_AND_PROPAGATED" :
611 // es == EQUALITY_TRUE ? "EQUALITY_TRUE" :
612 // es == EQUALITY_FALSE ? "EQUALITY_FALSE" :
613 // es == EQUALITY_TRUE_IN_MODEL ? "EQUALITY_TRUE_IN_MODEL" :
614 // es == EQUALITY_FALSE_IN_MODEL ? "EQUALITY_FALSE_IN_MODEL" :
615 // es == EQUALITY_UNKNOWN ? "EQUALITY_UNKNOWN" :
616 // "Unexpected case") << endl;
618 // We need to split on it
619 Debug("combineTheories") << "TheoryEngine::combineTheories(): requesting a split " << endl
;
621 lemma(equality
.orNode(equality
.notNode()),
628 // This code is supposed to force preference to follow what the theory models already have
629 // but it doesn't seem to make a big difference - need to explore more -Clark
631 // if (es == EQUALITY_TRUE || es == EQUALITY_TRUE_IN_MODEL) {
632 Node e
= ensureLiteral(equality
);
633 d_propEngine
->requirePhase(e
, true);
635 // else if (es == EQUALITY_FALSE_IN_MODEL) {
636 // Node e = ensureLiteral(equality);
637 // d_propEngine->requirePhase(e, false);
643 void TheoryEngine::propagate(Theory::Effort effort
) {
644 // Reset the interrupt flag
645 d_interrupted
= false;
647 // Definition of the statement that is to be run by every theory
648 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
649 #undef CVC4_FOR_EACH_THEORY_STATEMENT
651 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
652 if (theory::TheoryTraits<THEORY>::hasPropagate && d_logicInfo.isTheoryEnabled(THEORY)) { \
653 theoryOf(THEORY)->propagate(effort); \
656 // Reset the interrupt flag
657 d_interrupted
= false;
659 // Propagate for each theory using the statement above
660 CVC4_FOR_EACH_THEORY
;
662 if(Dump
.isOn("missed-t-propagations")) {
663 for(unsigned i
= 0; i
< d_possiblePropagations
.size(); ++i
) {
664 Node atom
= d_possiblePropagations
[i
];
666 if(d_propEngine
->hasValue(atom
, value
)) {
669 // Doesn't have a value, check it (and the negation)
670 if(d_hasPropagated
.find(atom
) == d_hasPropagated
.end()) {
671 Dump("missed-t-propagations")
672 << CommentCommand("Completeness check for T-propagations; expect invalid")
673 << EchoCommand(atom
.toString())
674 << QueryCommand(atom
.toExpr())
675 << EchoCommand(atom
.notNode().toString())
676 << QueryCommand(atom
.notNode().toExpr());
682 Node
TheoryEngine::getNextDecisionRequest()
684 return d_decManager
->getNextDecisionRequest();
687 bool TheoryEngine::properConflict(TNode conflict
) const {
689 if (conflict
.getKind() == kind::AND
) {
690 for (unsigned i
= 0; i
< conflict
.getNumChildren(); ++ i
) {
691 if (! getPropEngine()->hasValue(conflict
[i
], value
)) {
692 Debug("properConflict") << "Bad conflict is due to unassigned atom: "
693 << conflict
[i
] << endl
;
697 Debug("properConflict") << "Bad conflict is due to false atom: "
698 << conflict
[i
] << endl
;
701 if (conflict
[i
] != Rewriter::rewrite(conflict
[i
])) {
702 Debug("properConflict") << "Bad conflict is due to atom not in normal form: "
703 << conflict
[i
] << " vs " << Rewriter::rewrite(conflict
[i
]) << endl
;
708 if (! getPropEngine()->hasValue(conflict
, value
)) {
709 Debug("properConflict") << "Bad conflict is due to unassigned atom: "
714 Debug("properConflict") << "Bad conflict is due to false atom: "
718 if (conflict
!= Rewriter::rewrite(conflict
)) {
719 Debug("properConflict") << "Bad conflict is due to atom not in normal form: "
720 << conflict
<< " vs " << Rewriter::rewrite(conflict
) << endl
;
727 bool TheoryEngine::properPropagation(TNode lit
) const {
728 if(!getPropEngine()->isSatLiteral(lit
)) {
732 return !getPropEngine()->hasValue(lit
, b
);
735 bool TheoryEngine::properExplanation(TNode node
, TNode expl
) const {
736 // Explanation must be either a conjunction of true literals that have true SAT values already
737 // or a singled literal that has a true SAT value already.
738 if (expl
.getKind() == kind::AND
) {
739 for (unsigned i
= 0; i
< expl
.getNumChildren(); ++ i
) {
741 if (!d_propEngine
->hasValue(expl
[i
], value
) || !value
) {
747 return d_propEngine
->hasValue(expl
, value
) && value
;
752 bool TheoryEngine::collectModelInfo(theory::TheoryModel
* m
)
754 //have shared term engine collectModelInfo
755 // d_sharedTerms.collectModelInfo( m );
756 // Consult each active theory to get all relevant information
757 // concerning the model.
758 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
< theory::THEORY_LAST
; ++theoryId
) {
759 if(d_logicInfo
.isTheoryEnabled(theoryId
)) {
760 Trace("model-builder") << " CollectModelInfo on theory: " << theoryId
<< endl
;
761 if (!d_theoryTable
[theoryId
]->collectModelInfo(m
))
767 Trace("model-builder") << " CollectModelInfo boolean variables" << std::endl
;
768 // Get the Boolean variables
769 vector
<TNode
> boolVars
;
770 d_propEngine
->getBooleanVariables(boolVars
);
771 vector
<TNode
>::iterator it
, iend
= boolVars
.end();
772 bool hasValue
, value
;
773 for (it
= boolVars
.begin(); it
!= iend
; ++it
) {
775 hasValue
= d_propEngine
->hasValue(var
, value
);
776 // TODO: Assert that hasValue is true?
778 Trace("model-builder-assertions")
779 << " has no value : " << var
<< std::endl
;
782 Trace("model-builder-assertions") << "(assert" << (value
? " " : " (not ") << var
<< (value
? ");" : "));") << endl
;
783 if (!m
->assertPredicate(var
, value
))
791 void TheoryEngine::postProcessModel( theory::TheoryModel
* m
){
792 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
< theory::THEORY_LAST
; ++theoryId
) {
793 if(d_logicInfo
.isTheoryEnabled(theoryId
)) {
794 Trace("model-builder-debug") << " PostProcessModel on theory: " << theoryId
<< endl
;
795 d_theoryTable
[theoryId
]->postProcessModel( m
);
800 TheoryModel
* TheoryEngine::getModel() {
804 TheoryModel
* TheoryEngine::getBuiltModel()
806 if (!d_curr_model
->isBuilt())
808 // If this method was called, we should be in SAT mode, and produceModels
810 AlwaysAssert(options::produceModels());
813 // not available, perhaps due to interuption.
816 // must build model at this point
817 d_curr_model_builder
->buildModel(d_curr_model
);
822 bool TheoryEngine::getSynthSolutions(
823 std::map
<Node
, std::map
<Node
, Node
>>& sol_map
)
827 return d_quantEngine
->getSynthSolutions(sol_map
);
829 // we are not in a quantified logic, there is no synthesis solution
833 bool TheoryEngine::presolve() {
834 // Reset the interrupt flag
835 d_interrupted
= false;
837 // Reset the decision manager. This clears its decision strategies that are
838 // no longer valid in this user context.
839 d_decManager
->presolve();
842 // Definition of the statement that is to be run by every theory
843 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
844 #undef CVC4_FOR_EACH_THEORY_STATEMENT
846 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
847 if (theory::TheoryTraits<THEORY>::hasPresolve) { \
848 theoryOf(THEORY)->presolve(); \
854 // Presolve for each theory using the statement above
855 CVC4_FOR_EACH_THEORY
;
856 } catch(const theory::Interrupted
&) {
857 Trace("theory") << "TheoryEngine::presolve() => interrupted" << endl
;
859 // return whether we have a conflict
861 }/* TheoryEngine::presolve() */
863 void TheoryEngine::postsolve() {
864 // no longer in SAT mode
866 // Reset the interrupt flag
867 d_interrupted
= false;
868 bool CVC4_UNUSED wasInConflict
= d_inConflict
;
871 // Definition of the statement that is to be run by every theory
872 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
873 #undef CVC4_FOR_EACH_THEORY_STATEMENT
875 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
876 if (theory::TheoryTraits<THEORY>::hasPostsolve) \
878 theoryOf(THEORY)->postsolve(); \
879 Assert(!d_inConflict || wasInConflict) \
880 << "conflict raised during postsolve()"; \
883 // Postsolve for each theory using the statement above
884 CVC4_FOR_EACH_THEORY
;
885 } catch(const theory::Interrupted
&) {
886 Trace("theory") << "TheoryEngine::postsolve() => interrupted" << endl
;
888 }/* TheoryEngine::postsolve() */
891 void TheoryEngine::notifyRestart() {
892 // Reset the interrupt flag
893 d_interrupted
= false;
895 // Definition of the statement that is to be run by every theory
896 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
897 #undef CVC4_FOR_EACH_THEORY_STATEMENT
899 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
900 if (theory::TheoryTraits<THEORY>::hasNotifyRestart && d_logicInfo.isTheoryEnabled(THEORY)) { \
901 theoryOf(THEORY)->notifyRestart(); \
904 // notify each theory using the statement above
905 CVC4_FOR_EACH_THEORY
;
908 void TheoryEngine::ppStaticLearn(TNode in
, NodeBuilder
<>& learned
) {
909 // Reset the interrupt flag
910 d_interrupted
= false;
912 // Definition of the statement that is to be run by every theory
913 #ifdef CVC4_FOR_EACH_THEORY_STATEMENT
914 #undef CVC4_FOR_EACH_THEORY_STATEMENT
916 #define CVC4_FOR_EACH_THEORY_STATEMENT(THEORY) \
917 if (theory::TheoryTraits<THEORY>::hasPpStaticLearn) { \
918 theoryOf(THEORY)->ppStaticLearn(in, learned); \
921 // static learning for each theory using the statement above
922 CVC4_FOR_EACH_THEORY
;
925 void TheoryEngine::shutdown() {
926 // Set this first; if a Theory shutdown() throws an exception,
927 // at least the destruction of the TheoryEngine won't confound
929 d_hasShutDown
= true;
931 // Shutdown all the theories
932 for(TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
< theory::THEORY_LAST
; ++theoryId
) {
933 if(d_theoryTable
[theoryId
]) {
934 theoryOf(theoryId
)->shutdown();
941 theory::Theory::PPAssertStatus
TheoryEngine::solve(TNode literal
, SubstitutionMap
& substitutionOut
) {
942 // Reset the interrupt flag
943 d_interrupted
= false;
945 TNode atom
= literal
.getKind() == kind::NOT
? literal
[0] : literal
;
946 Trace("theory::solve") << "TheoryEngine::solve(" << literal
<< "): solving with " << theoryOf(atom
)->getId() << endl
;
948 if(! d_logicInfo
.isTheoryEnabled(Theory::theoryOf(atom
)) &&
949 Theory::theoryOf(atom
) != THEORY_SAT_SOLVER
) {
951 ss
<< "The logic was specified as " << d_logicInfo
.getLogicString()
952 << ", which doesn't include " << Theory::theoryOf(atom
)
953 << ", but got a preprocessing-time fact for that theory." << endl
954 << "The fact:" << endl
956 throw LogicException(ss
.str());
959 Theory::PPAssertStatus solveStatus
= theoryOf(atom
)->ppAssert(literal
, substitutionOut
);
960 Trace("theory::solve") << "TheoryEngine::solve(" << literal
<< ") => " << solveStatus
<< endl
;
964 void TheoryEngine::preprocessStart() { d_tpp
.clearCache(); }
966 Node
TheoryEngine::preprocess(TNode assertion
) {
967 return d_tpp
.theoryPreprocess(assertion
);
970 void TheoryEngine::notifyPreprocessedAssertions(
971 const std::vector
<Node
>& assertions
) {
972 // call all the theories
973 for (TheoryId theoryId
= theory::THEORY_FIRST
; theoryId
< theory::THEORY_LAST
;
975 if (d_theoryTable
[theoryId
]) {
976 theoryOf(theoryId
)->ppNotifyAssertions(assertions
);
981 bool TheoryEngine::markPropagation(TNode assertion
, TNode originalAssertion
, theory::TheoryId toTheoryId
, theory::TheoryId fromTheoryId
) {
983 // What and where we are asserting
984 NodeTheoryPair
toAssert(assertion
, toTheoryId
, d_propagationMapTimestamp
);
985 // What and where it came from
986 NodeTheoryPair
toExplain(originalAssertion
, fromTheoryId
, d_propagationMapTimestamp
);
988 // See if the theory already got this literal
989 PropagationMap::const_iterator find
= d_propagationMap
.find(toAssert
);
990 if (find
!= d_propagationMap
.end()) {
991 // The theory already knows this
992 Trace("theory::assertToTheory") << "TheoryEngine::markPropagation(): already there" << endl
;
996 Trace("theory::assertToTheory") << "TheoryEngine::markPropagation(): marking [" << d_propagationMapTimestamp
<< "] " << assertion
<< ", " << toTheoryId
<< " from " << originalAssertion
<< ", " << fromTheoryId
<< endl
;
998 // Mark the propagation
999 d_propagationMap
[toAssert
] = toExplain
;
1000 d_propagationMapTimestamp
= d_propagationMapTimestamp
+ 1;
1006 void TheoryEngine::assertToTheory(TNode assertion
, TNode originalAssertion
, theory::TheoryId toTheoryId
, theory::TheoryId fromTheoryId
) {
1008 Trace("theory::assertToTheory") << "TheoryEngine::assertToTheory(" << assertion
<< ", " << originalAssertion
<< "," << toTheoryId
<< ", " << fromTheoryId
<< ")" << endl
;
1010 Assert(toTheoryId
!= fromTheoryId
);
1011 if(toTheoryId
!= THEORY_SAT_SOLVER
&&
1012 ! d_logicInfo
.isTheoryEnabled(toTheoryId
)) {
1014 ss
<< "The logic was specified as " << d_logicInfo
.getLogicString()
1015 << ", which doesn't include " << toTheoryId
1016 << ", but got an asserted fact to that theory." << endl
1017 << "The fact:" << endl
1019 throw LogicException(ss
.str());
1026 // If sharing is disabled, things are easy
1027 if (!d_logicInfo
.isSharingEnabled()) {
1028 Assert(assertion
== originalAssertion
);
1029 if (fromTheoryId
== THEORY_SAT_SOLVER
) {
1030 // Send to the apropriate theory
1031 theory::Theory
* toTheory
= theoryOf(toTheoryId
);
1032 // We assert it, and we know it's preregistereed
1033 toTheory
->assertFact(assertion
, true);
1034 // Mark that we have more information
1035 d_factsAsserted
= true;
1037 Assert(toTheoryId
== THEORY_SAT_SOLVER
);
1038 // Check for propositional conflict
1040 if (d_propEngine
->hasValue(assertion
, value
)) {
1042 Trace("theory::propagate") << "TheoryEngine::assertToTheory(" << assertion
<< ", " << toTheoryId
<< ", " << fromTheoryId
<< "): conflict (no sharing)" << endl
;
1043 Trace("dtview::conflict")
1044 << ":THEORY-CONFLICT: " << assertion
<< std::endl
;
1045 d_inConflict
= true;
1050 d_propagatedLiterals
.push_back(assertion
);
1055 // Polarity of the assertion
1056 bool polarity
= assertion
.getKind() != kind::NOT
;
1058 // Atom of the assertion
1059 TNode atom
= polarity
? assertion
: assertion
[0];
1061 // If sending to the shared terms database, it's also simple
1062 if (toTheoryId
== THEORY_BUILTIN
) {
1063 Assert(atom
.getKind() == kind::EQUAL
)
1064 << "atom should be an EQUALity, not `" << atom
<< "'";
1065 if (markPropagation(assertion
, originalAssertion
, toTheoryId
, fromTheoryId
)) {
1066 d_sharedTerms
.assertEquality(atom
, polarity
, assertion
);
1071 // Things from the SAT solver are already normalized, so they go
1072 // directly to the apropriate theory
1073 if (fromTheoryId
== THEORY_SAT_SOLVER
) {
1074 // We know that this is normalized, so just send it off to the theory
1075 if (markPropagation(assertion
, originalAssertion
, toTheoryId
, fromTheoryId
)) {
1076 // Is it preregistered
1077 bool preregistered
= d_propEngine
->isSatLiteral(assertion
) && Theory::theoryOf(assertion
) == toTheoryId
;
1079 theoryOf(toTheoryId
)->assertFact(assertion
, preregistered
);
1080 // Mark that we have more information
1081 d_factsAsserted
= true;
1086 // Propagations to the SAT solver are just enqueued for pickup by
1087 // the SAT solver later
1088 if (toTheoryId
== THEORY_SAT_SOLVER
) {
1089 if (markPropagation(assertion
, originalAssertion
, toTheoryId
, fromTheoryId
)) {
1090 // Enqueue for propagation to the SAT solver
1091 d_propagatedLiterals
.push_back(assertion
);
1092 // Check for propositional conflicts
1094 if (d_propEngine
->hasValue(assertion
, value
) && !value
) {
1095 Trace("theory::propagate")
1096 << "TheoryEngine::assertToTheory(" << assertion
<< ", "
1097 << toTheoryId
<< ", " << fromTheoryId
<< "): conflict (sharing)"
1099 Trace("dtview::conflict")
1100 << ":THEORY-CONFLICT: " << assertion
<< std::endl
;
1101 d_inConflict
= true;
1107 Assert(atom
.getKind() == kind::EQUAL
);
1110 Node normalizedLiteral
= Rewriter::rewrite(assertion
);
1112 // See if it rewrites false directly -> conflict
1113 if (normalizedLiteral
.isConst()) {
1114 if (!normalizedLiteral
.getConst
<bool>()) {
1115 // Mark the propagation for explanations
1116 if (markPropagation(normalizedLiteral
, originalAssertion
, toTheoryId
, fromTheoryId
)) {
1117 // Get the explanation (conflict will figure out where it came from)
1118 conflict(normalizedLiteral
, toTheoryId
);
1126 // Try and assert (note that we assert the non-normalized one)
1127 if (markPropagation(assertion
, originalAssertion
, toTheoryId
, fromTheoryId
)) {
1128 // Check if has been pre-registered with the theory
1129 bool preregistered
= d_propEngine
->isSatLiteral(assertion
) && Theory::theoryOf(assertion
) == toTheoryId
;
1131 theoryOf(toTheoryId
)->assertFact(assertion
, preregistered
);
1132 d_factsAsserted
= true;
1138 void TheoryEngine::assertFact(TNode literal
)
1140 Trace("theory") << "TheoryEngine::assertFact(" << literal
<< ")" << endl
;
1144 // If we're in conflict, nothing to do
1150 bool polarity
= literal
.getKind() != kind::NOT
;
1151 TNode atom
= polarity
? literal
: literal
[0];
1153 if (d_logicInfo
.isSharingEnabled()) {
1155 // If any shared terms, it's time to do sharing work
1156 if (d_sharedTerms
.hasSharedTerms(atom
)) {
1157 // Notify the theories the shared terms
1158 SharedTermsDatabase::shared_terms_iterator it
= d_sharedTerms
.begin(atom
);
1159 SharedTermsDatabase::shared_terms_iterator it_end
= d_sharedTerms
.end(atom
);
1160 for (; it
!= it_end
; ++ it
) {
1162 Theory::Set theories
= d_sharedTerms
.getTheoriesToNotify(atom
, term
);
1163 for (TheoryId id
= THEORY_FIRST
; id
!= THEORY_LAST
; ++ id
) {
1164 if (Theory::setContains(id
, theories
)) {
1165 theoryOf(id
)->addSharedTermInternal(term
);
1168 d_sharedTerms
.markNotified(term
, theories
);
1172 // If it's an equality, assert it to the shared term manager, even though the terms are not
1173 // yet shared. As the terms become shared later, the shared terms manager will then add them
1174 // to the assert the equality to the interested theories
1175 if (atom
.getKind() == kind::EQUAL
) {
1176 // Assert it to the the owning theory
1177 assertToTheory(literal
, literal
, /* to */ Theory::theoryOf(atom
), /* from */ THEORY_SAT_SOLVER
);
1178 // Shared terms manager will assert to interested theories directly, as the terms become shared
1179 assertToTheory(literal
, literal
, /* to */ THEORY_BUILTIN
, /* from */ THEORY_SAT_SOLVER
);
1181 // Now, let's check for any atom triggers from lemmas
1182 AtomRequests::atom_iterator it
= d_atomRequests
.getAtomIterator(atom
);
1183 while (!it
.done()) {
1184 const AtomRequests::Request
& request
= it
.get();
1186 polarity
? (Node
)request
.d_atom
: request
.d_atom
.notNode();
1187 Debug("theory::atoms") << "TheoryEngine::assertFact(" << literal
<< "): sending requested " << toAssert
<< endl
;
1189 toAssert
, literal
, request
.d_toTheory
, THEORY_SAT_SOLVER
);
1194 // Not an equality, just assert to the appropriate theory
1195 assertToTheory(literal
, literal
, /* to */ Theory::theoryOf(atom
), /* from */ THEORY_SAT_SOLVER
);
1198 // Assert the fact to the appropriate theory directly
1199 assertToTheory(literal
, literal
, /* to */ Theory::theoryOf(atom
), /* from */ THEORY_SAT_SOLVER
);
1203 bool TheoryEngine::propagate(TNode literal
, theory::TheoryId theory
) {
1205 Debug("theory::propagate") << "TheoryEngine::propagate(" << literal
<< ", " << theory
<< ")" << endl
;
1207 Trace("dtview::prop") << std::string(d_context
->getLevel(), ' ')
1208 << ":THEORY-PROP: " << literal
<< endl
;
1212 if(Dump
.isOn("t-propagations")) {
1213 Dump("t-propagations") << CommentCommand("negation of theory propagation: expect valid")
1214 << QueryCommand(literal
.toExpr());
1216 if(Dump
.isOn("missed-t-propagations")) {
1217 d_hasPropagated
.insert(literal
);
1221 bool polarity
= literal
.getKind() != kind::NOT
;
1222 TNode atom
= polarity
? literal
: literal
[0];
1224 if (d_logicInfo
.isSharingEnabled() && atom
.getKind() == kind::EQUAL
) {
1225 if (d_propEngine
->isSatLiteral(literal
)) {
1226 // We propagate SAT literals to SAT
1227 assertToTheory(literal
, literal
, /* to */ THEORY_SAT_SOLVER
, /* from */ theory
);
1229 if (theory
!= THEORY_BUILTIN
) {
1230 // Assert to the shared terms database
1231 assertToTheory(literal
, literal
, /* to */ THEORY_BUILTIN
, /* from */ theory
);
1234 // We could be propagating a unit-clause lemma. In this case, we need to provide a
1236 // TODO: Consider putting this someplace else? This is the only refence to the proof
1237 // manager in this class.
1240 LemmaProofRecipe proofRecipe
;
1241 proofRecipe
.addBaseAssertion(literal
);
1244 LemmaProofRecipe::ProofStep
proofStep(theory
, emptyNode
);
1245 proofStep
.addAssertion(literal
);
1246 proofRecipe
.addStep(proofStep
);
1248 ProofManager::getCnfProof()->setProofRecipe(&proofRecipe
);
1251 // Just send off to the SAT solver
1252 Assert(d_propEngine
->isSatLiteral(literal
));
1253 assertToTheory(literal
, literal
, /* to */ THEORY_SAT_SOLVER
, /* from */ theory
);
1256 return !d_inConflict
;
1259 const LogicInfo
& TheoryEngine::getLogicInfo() const { return d_logicInfo
; }
1261 theory::EqualityStatus
TheoryEngine::getEqualityStatus(TNode a
, TNode b
) {
1262 Assert(a
.getType().isComparableTo(b
.getType()));
1263 if (d_sharedTerms
.isShared(a
) && d_sharedTerms
.isShared(b
)) {
1264 if (d_sharedTerms
.areEqual(a
,b
)) {
1265 return EQUALITY_TRUE_AND_PROPAGATED
;
1267 else if (d_sharedTerms
.areDisequal(a
,b
)) {
1268 return EQUALITY_FALSE_AND_PROPAGATED
;
1271 return theoryOf(Theory::theoryOf(a
.getType()))->getEqualityStatus(a
, b
);
1274 Node
TheoryEngine::getModelValue(TNode var
) {
1277 // the model value of a constant must be itself
1280 Assert(d_sharedTerms
.isShared(var
));
1281 return theoryOf(Theory::theoryOf(var
.getType()))->getModelValue(var
);
1285 Node
TheoryEngine::ensureLiteral(TNode n
) {
1286 Debug("ensureLiteral") << "rewriting: " << n
<< std::endl
;
1287 Node rewritten
= Rewriter::rewrite(n
);
1288 Debug("ensureLiteral") << " got: " << rewritten
<< std::endl
;
1289 Node preprocessed
= preprocess(rewritten
);
1290 Debug("ensureLiteral") << "preprocessed: " << preprocessed
<< std::endl
;
1291 d_propEngine
->ensureLiteral(preprocessed
);
1292 return preprocessed
;
1296 void TheoryEngine::printInstantiations( std::ostream
& out
) {
1297 if( d_quantEngine
){
1298 d_quantEngine
->printInstantiations( out
);
1300 out
<< "Internal error : instantiations not available when quantifiers are not present." << std::endl
;
1305 void TheoryEngine::printSynthSolution( std::ostream
& out
) {
1306 if( d_quantEngine
){
1307 d_quantEngine
->printSynthSolution( out
);
1309 out
<< "Internal error : synth solution not available when quantifiers are not present." << std::endl
;
1314 void TheoryEngine::getInstantiatedQuantifiedFormulas( std::vector
< Node
>& qs
) {
1315 if( d_quantEngine
){
1316 d_quantEngine
->getInstantiatedQuantifiedFormulas( qs
);
1322 void TheoryEngine::getInstantiations( Node q
, std::vector
< Node
>& insts
) {
1323 if( d_quantEngine
){
1324 d_quantEngine
->getInstantiations( q
, insts
);
1330 void TheoryEngine::getInstantiationTermVectors( Node q
, std::vector
< std::vector
< Node
> >& tvecs
) {
1331 if( d_quantEngine
){
1332 d_quantEngine
->getInstantiationTermVectors( q
, tvecs
);
1338 void TheoryEngine::getInstantiations( std::map
< Node
, std::vector
< Node
> >& insts
) {
1339 if( d_quantEngine
){
1340 d_quantEngine
->getInstantiations( insts
);
1346 void TheoryEngine::getInstantiationTermVectors( std::map
< Node
, std::vector
< std::vector
< Node
> > >& insts
) {
1347 if( d_quantEngine
){
1348 d_quantEngine
->getInstantiationTermVectors( insts
);
1354 Node
TheoryEngine::getInstantiatedConjunction( Node q
) {
1355 if( d_quantEngine
){
1356 return d_quantEngine
->getInstantiatedConjunction( q
);
1359 return Node::null();
1364 static Node
mkExplanation(const std::vector
<NodeTheoryPair
>& explanation
) {
1366 std::set
<TNode
> all
;
1367 for (unsigned i
= 0; i
< explanation
.size(); ++ i
) {
1368 Assert(explanation
[i
].d_theory
== THEORY_SAT_SOLVER
);
1369 all
.insert(explanation
[i
].d_node
);
1372 if (all
.size() == 0) {
1373 // Normalize to true
1374 return NodeManager::currentNM()->mkConst
<bool>(true);
1377 if (all
.size() == 1) {
1378 // All the same, or just one
1379 return explanation
[0].d_node
;
1382 NodeBuilder
<> conjunction(kind::AND
);
1383 std::set
<TNode
>::const_iterator it
= all
.begin();
1384 std::set
<TNode
>::const_iterator it_end
= all
.end();
1385 while (it
!= it_end
) {
1393 Node
TheoryEngine::getExplanationAndRecipe(TNode node
, LemmaProofRecipe
* proofRecipe
) {
1394 Debug("theory::explain") << "TheoryEngine::getExplanation(" << node
<< "): current propagation index = " << d_propagationMapTimestamp
<< endl
;
1396 bool polarity
= node
.getKind() != kind::NOT
;
1397 TNode atom
= polarity
? node
: node
[0];
1399 // If we're not in shared mode, explanations are simple
1400 if (!d_logicInfo
.isSharingEnabled()) {
1401 Debug("theory::explain") << "TheoryEngine::getExplanation: sharing is NOT enabled. "
1402 << " Responsible theory is: "
1403 << theoryOf(atom
)->getId() << std::endl
;
1405 TrustNode texplanation
= theoryOf(atom
)->explain(node
);
1406 Node explanation
= texplanation
.getNode();
1407 Debug("theory::explain") << "TheoryEngine::getExplanation(" << node
<< ") => " << explanation
<< endl
;
1411 LemmaProofRecipe::ProofStep
proofStep(theoryOf(atom
)->getId(), emptyNode
);
1412 proofStep
.addAssertion(node
);
1413 proofRecipe
->addBaseAssertion(node
);
1415 if (explanation
.getKind() == kind::AND
) {
1416 // If the explanation is a conjunction, the recipe for the corresponding lemma is
1417 // the negation of its conjuncts.
1418 Node flat
= flattenAnd(explanation
);
1419 for (unsigned i
= 0; i
< flat
.getNumChildren(); ++i
) {
1420 if (flat
[i
].isConst() && flat
[i
].getConst
<bool>()) {
1424 if (flat
[i
].getKind() == kind::NOT
&&
1425 flat
[i
][0].isConst() && !flat
[i
][0].getConst
<bool>()) {
1429 Debug("theory::explain") << "TheoryEngine::getExplanationAndRecipe: adding recipe assertion: "
1430 << flat
[i
].negate() << std::endl
;
1431 proofStep
.addAssertion(flat
[i
].negate());
1432 proofRecipe
->addBaseAssertion(flat
[i
].negate());
1435 // The recipe for proving it is by negating it. "True" is not an acceptable reason.
1436 if (!((explanation
.isConst() && explanation
.getConst
<bool>()) ||
1437 (explanation
.getKind() == kind::NOT
&&
1438 explanation
[0].isConst() && !explanation
[0].getConst
<bool>()))) {
1439 proofStep
.addAssertion(explanation
.negate());
1440 proofRecipe
->addBaseAssertion(explanation
.negate());
1444 proofRecipe
->addStep(proofStep
);
1451 Debug("theory::explain") << "TheoryEngine::getExplanation: sharing IS enabled" << std::endl
;
1453 // Initial thing to explain
1454 NodeTheoryPair
toExplain(node
, THEORY_SAT_SOLVER
, d_propagationMapTimestamp
);
1455 Assert(d_propagationMap
.find(toExplain
) != d_propagationMap
.end());
1457 NodeTheoryPair nodeExplainerPair
= d_propagationMap
[toExplain
];
1458 Debug("theory::explain")
1459 << "TheoryEngine::getExplanation: explainer for node "
1460 << nodeExplainerPair
.d_node
1461 << " is theory: " << nodeExplainerPair
.d_theory
<< std::endl
;
1462 TheoryId explainer
= nodeExplainerPair
.d_theory
;
1464 // Create the workplace for explanations
1465 std::vector
<NodeTheoryPair
> explanationVector
;
1466 explanationVector
.push_back(d_propagationMap
[toExplain
]);
1467 // Process the explanation
1470 LemmaProofRecipe::ProofStep
proofStep(explainer
, emptyNode
);
1471 proofStep
.addAssertion(node
);
1472 proofRecipe
->addStep(proofStep
);
1473 proofRecipe
->addBaseAssertion(node
);
1476 getExplanation(explanationVector
, proofRecipe
);
1477 Node explanation
= mkExplanation(explanationVector
);
1479 Debug("theory::explain") << "TheoryEngine::getExplanation(" << node
<< ") => " << explanation
<< endl
;
1484 Node
TheoryEngine::getExplanation(TNode node
) {
1485 LemmaProofRecipe
*dontCareRecipe
= NULL
;
1486 return getExplanationAndRecipe(node
, dontCareRecipe
);
1489 struct AtomsCollect
{
1491 std::vector
<TNode
> d_atoms
;
1492 std::unordered_set
<TNode
, TNodeHashFunction
> d_visited
;
1496 typedef void return_type
;
1498 bool alreadyVisited(TNode current
, TNode parent
) {
1499 // Check if already visited
1500 if (d_visited
.find(current
) != d_visited
.end()) return true;
1501 // Don't visit non-boolean
1502 if (!current
.getType().isBoolean()) return true;
1507 void visit(TNode current
, TNode parent
) {
1508 if (Theory::theoryOf(current
) != theory::THEORY_BOOL
) {
1509 d_atoms
.push_back(current
);
1511 d_visited
.insert(current
);
1514 void start(TNode node
) {}
1515 void done(TNode node
) {}
1517 std::vector
<TNode
> getAtoms() const {
1522 void TheoryEngine::ensureLemmaAtoms(const std::vector
<TNode
>& atoms
, theory::TheoryId atomsTo
) {
1523 for (unsigned i
= 0; i
< atoms
.size(); ++ i
) {
1525 // Non-equality atoms are either owned by theory or they don't make sense
1526 if (atoms
[i
].getKind() != kind::EQUAL
) {
1532 // Simple normalization to not repeat stuff
1533 if (eq
[0] > eq
[1]) {
1534 eq
= eq
[1].eqNode(eq
[0]);
1537 // Rewrite the equality
1538 Node eqNormalized
= Rewriter::rewrite(atoms
[i
]);
1540 Debug("theory::atoms") << "TheoryEngine::ensureLemmaAtoms(): " << eq
<< " with nf " << eqNormalized
<< endl
;
1542 // If the equality is a boolean constant, we send immediately
1543 if (eqNormalized
.isConst()) {
1544 if (eqNormalized
.getConst
<bool>()) {
1545 assertToTheory(eq
, eqNormalized
, /** to */ atomsTo
, /** Sat solver */ theory::THEORY_SAT_SOLVER
);
1547 assertToTheory(eq
.notNode(), eqNormalized
.notNode(), /** to */ atomsTo
, /** Sat solver */ theory::THEORY_SAT_SOLVER
);
1550 }else if( eqNormalized
.getKind() != kind::EQUAL
){
1551 Assert(eqNormalized
.getKind() == kind::BOOLEAN_TERM_VARIABLE
1552 || (eqNormalized
.getKind() == kind::NOT
1553 && eqNormalized
[0].getKind() == kind::BOOLEAN_TERM_VARIABLE
));
1554 // this happens for Boolean term equalities V = true that are rewritten to V, we should skip
1555 // TODO : revisit this
1559 // If the normalization did the just flips, keep the flip
1560 if (eqNormalized
[0] == eq
[1] && eqNormalized
[1] == eq
[0]) {
1564 // Check if the equality is already known by the sat solver
1565 if (d_propEngine
->isSatLiteral(eqNormalized
)) {
1567 if (d_propEngine
->hasValue(eqNormalized
, value
)) {
1569 assertToTheory(eq
, eqNormalized
, atomsTo
, theory::THEORY_SAT_SOLVER
);
1572 assertToTheory(eq
.notNode(), eqNormalized
.notNode(), atomsTo
, theory::THEORY_SAT_SOLVER
);
1578 // If the theory is asking about a different form, or the form is ok but if will go to a different theory
1579 // then we must figure it out
1580 if (eqNormalized
!= eq
|| Theory::theoryOf(eq
) != atomsTo
) {
1581 // If you get eqNormalized, send atoms[i] to atomsTo
1582 d_atomRequests
.add(eqNormalized
, eq
, atomsTo
);
1587 theory::LemmaStatus
TheoryEngine::lemma(TNode node
,
1592 theory::TheoryId atomsTo
) {
1593 // For resource-limiting (also does a time check).
1596 // Do we need to check atoms
1597 if (atomsTo
!= theory::THEORY_LAST
) {
1598 Debug("theory::atoms") << "TheoryEngine::lemma(" << node
<< ", " << atomsTo
<< ")" << endl
;
1599 AtomsCollect collectAtoms
;
1600 NodeVisitor
<AtomsCollect
>::run(collectAtoms
, node
);
1601 ensureLemmaAtoms(collectAtoms
.getAtoms(), atomsTo
);
1604 if(Dump
.isOn("t-lemmas")) {
1609 Dump("t-lemmas") << CommentCommand("theory lemma: expect valid")
1610 << CheckSatCommand(n
.toExpr());
1613 // the assertion pipeline storing the lemmas
1614 AssertionPipeline lemmas
;
1615 // call preprocessor
1616 d_tpp
.preprocess(node
, lemmas
, preprocess
);
1617 // assert lemmas to prop engine
1618 for (size_t i
= 0, lsize
= lemmas
.size(); i
< lsize
; ++i
)
1620 d_propEngine
->assertLemma(
1621 lemmas
[i
], i
== 0 && negated
, removable
, rule
, node
);
1624 // WARNING: Below this point don't assume lemmas[0] to be not negated.
1626 lemmas
.replace(0, lemmas
[0].notNode());
1630 // assert to decision engine
1633 d_propEngine
->addAssertionsToDecisionEngine(lemmas
);
1636 // Mark that we added some lemmas
1637 d_lemmasAdded
= true;
1639 // Lemma analysis isn't online yet; this lemma may only live for this
1641 Node retLemma
= lemmas
[0];
1642 if (lemmas
.size() > 1)
1644 // the returned lemma is the conjunction of all additional lemmas.
1645 retLemma
= NodeManager::currentNM()->mkNode(kind::AND
, lemmas
.ref());
1647 return theory::LemmaStatus(retLemma
, d_userContext
->getLevel());
1650 void TheoryEngine::conflict(TNode conflict
, TheoryId theoryId
) {
1652 Debug("theory::conflict") << "TheoryEngine::conflict(" << conflict
<< ", " << theoryId
<< ")" << endl
;
1654 Trace("dtview::conflict") << ":THEORY-CONFLICT: " << conflict
<< std::endl
;
1656 // Mark that we are in conflict
1657 d_inConflict
= true;
1659 if(Dump
.isOn("t-conflicts")) {
1660 Dump("t-conflicts") << CommentCommand("theory conflict: expect unsat")
1661 << CheckSatCommand(conflict
.toExpr());
1664 LemmaProofRecipe
* proofRecipe
= NULL
;
1666 proofRecipe
= new LemmaProofRecipe
;
1668 LemmaProofRecipe::ProofStep
proofStep(theoryId
, emptyNode
);
1670 if (conflict
.getKind() == kind::AND
) {
1671 for (unsigned i
= 0; i
< conflict
.getNumChildren(); ++i
) {
1672 proofStep
.addAssertion(conflict
[i
].negate());
1675 proofStep
.addAssertion(conflict
.negate());
1678 proofRecipe
->addStep(proofStep
);
1681 // In the multiple-theories case, we need to reconstruct the conflict
1682 if (d_logicInfo
.isSharingEnabled()) {
1683 // Create the workplace for explanations
1684 std::vector
<NodeTheoryPair
> explanationVector
;
1685 explanationVector
.push_back(NodeTheoryPair(conflict
, theoryId
, d_propagationMapTimestamp
));
1687 // Process the explanation
1688 getExplanation(explanationVector
, proofRecipe
);
1689 PROOF(ProofManager::getCnfProof()->setProofRecipe(proofRecipe
));
1690 Node fullConflict
= mkExplanation(explanationVector
);
1691 Debug("theory::conflict") << "TheoryEngine::conflict(" << conflict
<< ", " << theoryId
<< "): full = " << fullConflict
<< endl
;
1692 Assert(properConflict(fullConflict
));
1693 lemma(fullConflict
, RULE_CONFLICT
, true, true, false, THEORY_LAST
);
1696 // When only one theory, the conflict should need no processing
1697 Assert(properConflict(conflict
));
1699 if (conflict
.getKind() == kind::AND
) {
1700 // If the conflict is a conjunction, the corresponding lemma is derived by negating
1702 for (unsigned i
= 0; i
< conflict
.getNumChildren(); ++i
) {
1703 if (conflict
[i
].isConst() && conflict
[i
].getConst
<bool>()) {
1707 if (conflict
[i
].getKind() == kind::NOT
&&
1708 conflict
[i
][0].isConst() && !conflict
[i
][0].getConst
<bool>()) {
1712 proofRecipe
->getStep(0)->addAssertion(conflict
[i
].negate());
1713 proofRecipe
->addBaseAssertion(conflict
[i
].negate());
1716 proofRecipe
->getStep(0)->addAssertion(conflict
.negate());
1717 proofRecipe
->addBaseAssertion(conflict
.negate());
1720 ProofManager::getCnfProof()->setProofRecipe(proofRecipe
);
1723 lemma(conflict
, RULE_CONFLICT
, true, true, false, THEORY_LAST
);
1732 void TheoryEngine::staticInitializeBVOptions(
1733 const std::vector
<Node
>& assertions
)
1735 bool useSlicer
= true;
1736 if (options::bitvectorEqualitySlicer() == options::BvSlicerMode::ON
)
1738 if (!d_logicInfo
.isPure(theory::THEORY_BV
) || d_logicInfo
.isQuantified())
1739 throw ModalException(
1740 "Slicer currently only supports pure QF_BV formulas. Use "
1741 "--bv-eq-slicer=off");
1742 if (options::incrementalSolving())
1743 throw ModalException(
1744 "Slicer does not currently support incremental mode. Use "
1745 "--bv-eq-slicer=off");
1746 if (options::produceModels())
1747 throw ModalException(
1748 "Slicer does not currently support model generation. Use "
1749 "--bv-eq-slicer=off");
1751 else if (options::bitvectorEqualitySlicer() == options::BvSlicerMode::OFF
)
1755 else if (options::bitvectorEqualitySlicer() == options::BvSlicerMode::AUTO
)
1757 if ((!d_logicInfo
.isPure(theory::THEORY_BV
) || d_logicInfo
.isQuantified())
1758 || options::incrementalSolving()
1759 || options::produceModels())
1762 bv::utils::TNodeBoolMap cache
;
1763 for (unsigned i
= 0; i
< assertions
.size(); ++i
)
1765 useSlicer
= useSlicer
&& bv::utils::isCoreTerm(assertions
[i
], cache
);
1771 bv::TheoryBV
* bv_theory
= (bv::TheoryBV
*)d_theoryTable
[THEORY_BV
];
1772 bv_theory
->enableCoreTheorySlicer();
1776 void TheoryEngine::getExplanation(std::vector
<NodeTheoryPair
>& explanationVector
, LemmaProofRecipe
* proofRecipe
) {
1777 Assert(explanationVector
.size() > 0);
1779 unsigned i
= 0; // Index of the current literal we are processing
1780 unsigned j
= 0; // Index of the last literal we are keeping
1782 std::unique_ptr
<std::set
<Node
>> inputAssertions
= nullptr;
1786 inputAssertions
.reset(
1787 new std::set
<Node
>(proofRecipe
->getStep(0)->getAssertions()));
1791 while (i
< explanationVector
.size()) {
1792 // Get the current literal to explain
1793 NodeTheoryPair toExplain
= explanationVector
[i
];
1795 Debug("theory::explain")
1796 << "[i=" << i
<< "] TheoryEngine::explain(): processing ["
1797 << toExplain
.d_timestamp
<< "] " << toExplain
.d_node
<< " sent from "
1798 << toExplain
.d_theory
<< endl
;
1800 // If a true constant or a negation of a false constant we can ignore it
1801 if (toExplain
.d_node
.isConst() && toExplain
.d_node
.getConst
<bool>())
1806 if (toExplain
.d_node
.getKind() == kind::NOT
&& toExplain
.d_node
[0].isConst()
1807 && !toExplain
.d_node
[0].getConst
<bool>())
1813 // If from the SAT solver, keep it
1814 if (toExplain
.d_theory
== THEORY_SAT_SOLVER
)
1816 Debug("theory::explain") << "\tLiteral came from THEORY_SAT_SOLVER. Kepping it." << endl
;
1817 explanationVector
[j
++] = explanationVector
[i
++];
1821 // If an and, expand it
1822 if (toExplain
.d_node
.getKind() == kind::AND
)
1824 Debug("theory::explain")
1825 << "TheoryEngine::explain(): expanding " << toExplain
.d_node
1826 << " got from " << toExplain
.d_theory
<< endl
;
1827 for (unsigned k
= 0; k
< toExplain
.d_node
.getNumChildren(); ++k
)
1829 NodeTheoryPair
newExplain(
1830 toExplain
.d_node
[k
], toExplain
.d_theory
, toExplain
.d_timestamp
);
1831 explanationVector
.push_back(newExplain
);
1837 // See if it was sent to the theory by another theory
1838 PropagationMap::const_iterator find
= d_propagationMap
.find(toExplain
);
1839 if (find
!= d_propagationMap
.end()) {
1840 Debug("theory::explain")
1841 << "\tTerm was propagated by another theory (theory = "
1842 << getTheoryString((*find
).second
.d_theory
) << ")" << std::endl
;
1843 // There is some propagation, check if its a timely one
1844 if ((*find
).second
.d_timestamp
< toExplain
.d_timestamp
)
1846 Debug("theory::explain")
1847 << "\tRelevant timetsamp, pushing " << (*find
).second
.d_node
1848 << "to index = " << explanationVector
.size() << std::endl
;
1849 explanationVector
.push_back((*find
).second
);
1853 if (toExplain
.d_node
!= (*find
).second
.d_node
)
1855 Debug("pf::explain")
1856 << "TheoryEngine::getExplanation: Rewrite alert! toAssert = "
1857 << toExplain
.d_node
<< ", toExplain = " << (*find
).second
.d_node
1862 proofRecipe
->addRewriteRule(toExplain
.d_node
,
1863 (*find
).second
.d_node
);
1872 // It was produced by the theory, so ask for an explanation
1874 if (toExplain
.d_theory
== THEORY_BUILTIN
)
1876 explanation
= d_sharedTerms
.explain(toExplain
.d_node
);
1877 Debug("theory::explain") << "\tTerm was propagated by THEORY_BUILTIN. Explanation: " << explanation
<< std::endl
;
1881 TrustNode texp
= theoryOf(toExplain
.d_theory
)->explain(toExplain
.d_node
);
1882 explanation
= texp
.getNode();
1883 Debug("theory::explain") << "\tTerm was propagated by owner theory: "
1884 << theoryOf(toExplain
.d_theory
)->getId()
1885 << ". Explanation: " << explanation
<< std::endl
;
1888 Debug("theory::explain")
1889 << "TheoryEngine::explain(): got explanation " << explanation
1890 << " got from " << toExplain
.d_theory
<< endl
;
1891 Assert(explanation
!= toExplain
.d_node
)
1892 << "wasn't sent to you, so why are you explaining it trivially";
1893 // Mark the explanation
1894 NodeTheoryPair
newExplain(
1895 explanation
, toExplain
.d_theory
, toExplain
.d_timestamp
);
1896 explanationVector
.push_back(newExplain
);
1901 if (proofRecipe
&& inputAssertions
)
1903 // If we're expanding the target node of the explanation (this is the
1904 // first expansion...), we don't want to add it as a separate proof
1905 // step. It is already part of the assertions.
1906 if (!ContainsKey(*inputAssertions
, toExplain
.d_node
))
1908 LemmaProofRecipe::ProofStep
proofStep(toExplain
.d_theory
,
1910 if (explanation
.getKind() == kind::AND
)
1912 Node flat
= flattenAnd(explanation
);
1913 for (unsigned k
= 0; k
< flat
.getNumChildren(); ++k
)
1915 // If a true constant or a negation of a false constant we can
1917 if (!((flat
[k
].isConst() && flat
[k
].getConst
<bool>())
1918 || (flat
[k
].getKind() == kind::NOT
&& flat
[k
][0].isConst()
1919 && !flat
[k
][0].getConst
<bool>())))
1921 proofStep
.addAssertion(flat
[k
].negate());
1927 if (!((explanation
.isConst() && explanation
.getConst
<bool>())
1928 || (explanation
.getKind() == kind::NOT
1929 && explanation
[0].isConst()
1930 && !explanation
[0].getConst
<bool>())))
1932 proofStep
.addAssertion(explanation
.negate());
1935 proofRecipe
->addStep(proofStep
);
1941 // Keep only the relevant literals
1942 explanationVector
.resize(j
);
1946 // The remaining literals are the base of the proof
1947 for (unsigned k
= 0; k
< explanationVector
.size(); ++k
) {
1948 proofRecipe
->addBaseAssertion(explanationVector
[k
].d_node
.negate());
1954 void TheoryEngine::setUserAttribute(const std::string
& attr
,
1956 const std::vector
<Node
>& node_values
,
1957 const std::string
& str_value
)
1959 Trace("te-attr") << "set user attribute " << attr
<< " " << n
<< endl
;
1960 if( d_attr_handle
.find( attr
)!=d_attr_handle
.end() ){
1961 for( size_t i
=0; i
<d_attr_handle
[attr
].size(); i
++ ){
1962 d_attr_handle
[attr
][i
]->setUserAttribute(attr
, n
, node_values
, str_value
);
1965 //unhandled exception?
1969 void TheoryEngine::handleUserAttribute(const char* attr
, Theory
* t
) {
1970 Trace("te-attr") << "Handle user attribute " << attr
<< " " << t
<< endl
;
1971 std::string
str( attr
);
1972 d_attr_handle
[ str
].push_back( t
);
1975 void TheoryEngine::checkTheoryAssertionsWithModel(bool hardFailure
) {
1976 for(TheoryId theoryId
= THEORY_FIRST
; theoryId
< THEORY_LAST
; ++theoryId
) {
1977 Theory
* theory
= d_theoryTable
[theoryId
];
1978 if(theory
&& d_logicInfo
.isTheoryEnabled(theoryId
)) {
1979 for(context::CDList
<Assertion
>::const_iterator it
= theory
->facts_begin(),
1980 it_end
= theory
->facts_end();
1983 Node assertion
= (*it
).d_assertion
;
1984 Node val
= getModel()->getValue(assertion
);
1987 std::stringstream ss
;
1989 << " has an asserted fact that the model doesn't satisfy." << endl
1990 << "The fact: " << assertion
<< endl
1991 << "Model value: " << val
<< endl
;
1996 // Always an error if it is false
1997 InternalError() << ss
.str();
2001 // Otherwise just a warning. Notice this case may happen for
2002 // assertions with unevaluable operators, e.g. transcendental
2003 // functions. It also may happen for separation logic, where
2004 // check-model support is limited.
2005 Warning() << ss
.str();
2014 std::pair
<bool, Node
> TheoryEngine::entailmentCheck(
2015 options::TheoryOfMode mode
,
2017 const EntailmentCheckParameters
* params
,
2018 EntailmentCheckSideEffects
* seffects
)
2020 TNode atom
= (lit
.getKind() == kind::NOT
) ? lit
[0] : lit
;
2021 if( atom
.getKind()==kind::AND
|| atom
.getKind()==kind::OR
|| atom
.getKind()==kind::IMPLIES
){
2022 //Boolean connective, recurse
2023 std::vector
< Node
> children
;
2024 bool pol
= (lit
.getKind()!=kind::NOT
);
2025 bool is_conjunction
= pol
==(lit
.getKind()==kind::AND
);
2026 for( unsigned i
=0; i
<atom
.getNumChildren(); i
++ ){
2028 if( pol
==( lit
.getKind()==kind::IMPLIES
&& i
==0 ) ){
2029 ch
= atom
[i
].negate();
2031 std::pair
<bool, Node
> chres
= entailmentCheck( mode
, ch
, params
, seffects
);
2033 if( !is_conjunction
){
2036 children
.push_back( chres
.second
);
2038 }else if( !chres
.first
&& is_conjunction
){
2039 return std::pair
<bool, Node
>(false, Node::null());
2042 if( is_conjunction
){
2043 return std::pair
<bool, Node
>(true, NodeManager::currentNM()->mkNode(kind::AND
, children
));
2045 return std::pair
<bool, Node
>(false, Node::null());
2047 }else if( atom
.getKind()==kind::ITE
|| ( atom
.getKind()==kind::EQUAL
&& atom
[0].getType().isBoolean() ) ){
2048 bool pol
= (lit
.getKind()!=kind::NOT
);
2049 for( unsigned r
=0; r
<2; r
++ ){
2054 std::pair
<bool, Node
> chres
= entailmentCheck( mode
, ch
, params
, seffects
);
2056 Node ch2
= atom
[ atom
.getKind()==kind::ITE
? r
+1 : 1 ];
2057 if( pol
==( atom
.getKind()==kind::ITE
? true : r
==1 ) ){
2060 std::pair
<bool, Node
> chres2
= entailmentCheck( mode
, ch2
, params
, seffects
);
2062 return std::pair
<bool, Node
>(true, NodeManager::currentNM()->mkNode(kind::AND
, chres
.second
, chres2
.second
));
2068 return std::pair
<bool, Node
>(false, Node::null());
2070 //it is a theory atom
2071 theory::TheoryId tid
= theory::Theory::theoryOf(mode
, atom
);
2072 theory::Theory
* th
= theoryOf(tid
);
2075 Assert(params
== NULL
|| tid
== params
->getTheoryId());
2076 Assert(seffects
== NULL
|| tid
== seffects
->getTheoryId());
2077 Trace("theory-engine-entc") << "Entailment check : " << lit
<< std::endl
;
2079 std::pair
<bool, Node
> chres
= th
->entailmentCheck(lit
, params
, seffects
);
2084 void TheoryEngine::spendResource(ResourceManager::Resource r
)
2086 d_resourceManager
->spendResource(r
);
2089 }/* CVC4 namespace */