1 /********************* */
4 ** Top contributors (to current version):
5 ** Liana Hadarean, Morgan Deters, Dejan Jovanovic
6 ** This file is part of the CVC4 project.
7 ** Copyright (c) 2009-2016 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 Bitvector theory.
17 #include "cvc4_private.h"
19 #ifndef __CVC4__THEORY__BV__THEORY_BV_H
20 #define __CVC4__THEORY__BV__THEORY_BV_H
22 #include "context/cdhashset.h"
23 #include "context/cdlist.h"
24 #include "context/context.h"
25 #include "theory/bv/bv_subtheory.h"
26 #include "theory/bv/theory_bv_utils.h"
27 #include "theory/theory.h"
28 #include "util/hash.h"
29 #include "util/statistics_registry.h"
36 class InequalitySolver
;
37 class AlgebraicSolver
;
40 class EagerBitblastSolver
;
42 class AbstractionModule
;
44 class TheoryBV
: public Theory
{
46 /** The context we are using */
47 context::Context
* d_context
;
49 /** Context dependent set of atoms we already propagated */
50 context::CDHashSet
<Node
, NodeHashFunction
> d_alreadyPropagatedSet
;
51 context::CDHashSet
<Node
, NodeHashFunction
> d_sharedTermsSet
;
53 std::vector
<SubtheorySolver
*> d_subtheories
;
54 __gnu_cxx::hash_map
<SubTheory
, SubtheorySolver
*, std::hash
<int> > d_subtheoryMap
;
58 TheoryBV(context::Context
* c
, context::UserContext
* u
, OutputChannel
& out
,
59 Valuation valuation
, const LogicInfo
& logicInfo
);
63 void setMasterEqualityEngine(eq::EqualityEngine
* eq
);
65 Node
expandDefinition(LogicRequest
&logicRequest
, Node node
);
67 void mkAckermanizationAsssertions(std::vector
<Node
>& assertions
);
69 void preRegisterTerm(TNode n
);
73 void propagate(Effort e
);
75 Node
explain(TNode n
);
77 void collectModelInfo( TheoryModel
* m
, bool fullModel
);
79 std::string
identify() const { return std::string("TheoryBV"); }
81 PPAssertStatus
ppAssert(TNode in
, SubstitutionMap
& outSubstitutions
);
83 void enableCoreTheorySlicer();
85 Node
ppRewrite(TNode t
);
87 void ppStaticLearn(TNode in
, NodeBuilder
<>& learned
);
91 bool applyAbstraction(const std::vector
<Node
>& assertions
, std::vector
<Node
>& new_assertions
);
93 void setProofLog( BitVectorProof
* bvp
);
99 AverageStat d_avgConflictSize
;
100 IntStat d_solveSubstitutions
;
101 TimerStat d_solveTimer
;
102 IntStat d_numCallsToCheckFullEffort
;
103 IntStat d_numCallsToCheckStandardEffort
;
104 TimerStat d_weightComputationTimer
;
105 IntStat d_numMultSlice
;
110 Statistics d_statistics
;
112 void spendResource(unsigned ammount
) throw(UnsafeInterruptException
);
115 * Return the uninterpreted function symbol corresponding to division-by-zero
116 * for this particular bit-width
117 * @param k should be UREM or UDIV
122 Node
getBVDivByZero(Kind k
, unsigned width
);
124 typedef __gnu_cxx::hash_set
<TNode
, TNodeHashFunction
> TNodeSet
;
125 void collectNumerators(TNode term
, TNodeSet
& seen
);
127 typedef __gnu_cxx::hash_set
<Node
, NodeHashFunction
> NodeSet
;
128 NodeSet d_staticLearnCache
;
131 * Maps from bit-vector width to division-by-zero uninterpreted
134 __gnu_cxx::hash_map
<unsigned, Node
> d_BVDivByZero
;
135 __gnu_cxx::hash_map
<unsigned, Node
> d_BVRemByZero
;
138 * Maps from bit-vector width to numerators
139 * of uninterpreted function symbol
141 typedef __gnu_cxx::hash_map
<unsigned, TNodeSet
> WidthToNumerators
;
143 WidthToNumerators d_BVDivByZeroAckerman
;
144 WidthToNumerators d_BVRemByZeroAckerman
;
146 context::CDO
<bool> d_lemmasAdded
;
148 // Are we in conflict?
149 context::CDO
<bool> d_conflict
;
151 // Invalidate the model cache if check was called
152 context::CDO
<bool> d_invalidateModelCache
;
154 /** The conflict node */
157 /** Literals to propagate */
158 context::CDList
<Node
> d_literalsToPropagate
;
160 /** Index of the next literal to propagate */
161 context::CDO
<unsigned> d_literalsToPropagateIndex
;
164 * Keeps a map from nodes to the subtheory that propagated it so that we can explain it
167 typedef context::CDHashMap
<Node
, SubTheory
, NodeHashFunction
> PropagatedMap
;
168 PropagatedMap d_propagatedBy
;
170 EagerBitblastSolver
* d_eagerSolver
;
171 AbstractionModule
* d_abstractionModule
;
173 bool d_calledPreregister
;
175 bool wasPropagatedBySubtheory(TNode literal
) const {
176 return d_propagatedBy
.find(literal
) != d_propagatedBy
.end();
179 SubTheory
getPropagatingSubtheory(TNode literal
) const {
180 Assert(wasPropagatedBySubtheory(literal
));
181 PropagatedMap::const_iterator find
= d_propagatedBy
.find(literal
);
182 return (*find
).second
;
185 /** Should be called to propagate the literal. */
186 bool storePropagation(TNode literal
, SubTheory subtheory
);
189 * Explains why this literal (propagated by subtheory) is true by adding assumptions.
191 void explain(TNode literal
, std::vector
<TNode
>& assumptions
);
193 void addSharedTerm(TNode t
);
195 bool isSharedTerm(TNode t
) { return d_sharedTermsSet
.contains(t
); }
197 EqualityStatus
getEqualityStatus(TNode a
, TNode b
);
199 Node
getModelValue(TNode var
);
201 inline std::string
indent()
203 std::string
indentStr(getSatContext()->getLevel(), ' ');
207 void setConflict(Node conflict
= Node::null());
215 void lemma(TNode node
) { d_out
->lemma(node
, RULE_CONFLICT
); d_lemmasAdded
= true; }
217 void checkForLemma(TNode node
);
219 friend class LazyBitblaster
;
220 friend class TLazyBitblaster
;
221 friend class EagerBitblaster
;
222 friend class BitblastSolver
;
223 friend class EqualitySolver
;
224 friend class CoreSolver
;
225 friend class InequalitySolver
;
226 friend class AlgebraicSolver
;
227 friend class EagerBitblastSolver
;
228 };/* class TheoryBV */
230 }/* CVC4::theory::bv namespace */
231 }/* CVC4::theory namespace */
233 }/* CVC4 namespace */
235 #endif /* __CVC4__THEORY__BV__THEORY_BV_H */