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/**********************/
/*! \file term_database.h
** \verbatim
** Original author: ajreynol
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief term database class
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__QUANTIFIERS__TERM_DATABASE_H
#define __CVC4__THEORY__QUANTIFIERS__TERM_DATABASE_H
#include "theory/theory.h"
#include <map>
namespace CVC4 {
namespace theory {
class QuantifiersEngine;
namespace inst{
class Trigger;
}
namespace quantifiers {
class TermArgTrie {
private:
bool addTerm2( QuantifiersEngine* qe, Node n, int argIndex );
public:
/** the data */
std::map< Node, TermArgTrie > d_data;
public:
bool addTerm( QuantifiersEngine* qe, Node n ) { return addTerm2( qe, n, 0 ); }
};/* class TermArgTrie */
/** a trie of triggers */
class TrTrie {
private:
inst::Trigger* getTrigger2( std::vector< Node >& nodes );
void addTrigger2( std::vector< Node >& nodes, inst::Trigger* t );
public:
TrTrie() : d_tr( NULL ){}
inst::Trigger* d_tr;
std::map< TNode, TrTrie* > d_children;
inst::Trigger* getTrigger( std::vector< Node >& nodes ){
std::vector< Node > temp;
temp.insert( temp.begin(), nodes.begin(), nodes.end() );
std::sort( temp.begin(), temp.end() );
return getTrigger2( temp );
}
void addTrigger( std::vector< Node >& nodes, inst::Trigger* t ){
std::vector< Node > temp;
temp.insert( temp.begin(), nodes.begin(), nodes.end() );
std::sort( temp.begin(), temp.end() );
return addTrigger2( temp, t );
}
};/* class inst::Trigger::TrTrie */
class TermDb {
friend class ::CVC4::theory::QuantifiersEngine;
friend class ::CVC4::theory::inst::Trigger;
private:
/** reference to the quantifiers engine */
QuantifiersEngine* d_quantEngine;
/** calculated no match terms */
bool d_matching_active;
/** terms processed */
std::hash_set< Node, NodeHashFunction > d_processed;
public:
TermDb( QuantifiersEngine* qe ) : d_quantEngine( qe ), d_matching_active( true ){}
~TermDb(){}
/** map from APPLY_UF operators to ground terms for that operator */
std::map< Node, std::vector< Node > > d_op_map;
/** map from APPLY_UF functions to trie */
std::map< Node, TermArgTrie > d_func_map_trie;
/** map from APPLY_UF predicates to trie */
std::map< Node, TermArgTrie > d_pred_map_trie[2];
/** map from type nodes to terms of that type */
std::map< TypeNode, std::vector< Node > > d_type_map;
/** add a term to the database */
void addTerm( Node n, std::set< Node >& added, bool withinQuant = false );
/** reset (calculate which terms are active) */
void reset( Theory::Effort effort );
/** set active */
void setMatchingActive( bool a ) { d_matching_active = a; }
/** get active */
bool getMatchingActive() { return d_matching_active; }
private:
/** for efficient e-matching */
void addTermEfficient( Node n, std::set< Node >& added);
public:
/** parent structure (for efficient E-matching):
n -> op -> index -> L
map from node "n" to a list of nodes "L", where each node n' in L
has operator "op", and n'["index"] = n.
for example, d_parents[n][f][1] = { f( t1, n ), f( t2, n ), ... }
*/
/* Todo replace int by size_t */
std::hash_map< Node, std::hash_map< Node, std::hash_map< int, std::vector< Node > >, NodeHashFunction > , NodeHashFunction > d_parents;
const std::vector<Node> & getParents(TNode n, TNode f, int arg);
private:
//map from types to model basis terms
std::map< TypeNode, Node > d_model_basis_term;
//map from ops to model basis terms
std::map< Node, Node > d_model_basis_op_term;
//map from instantiation terms to their model basis equivalent
std::map< Node, Node > d_model_basis;
public:
//get model basis term
Node getModelBasisTerm( TypeNode tn, int i = 0 );
//get model basis term for op
Node getModelBasisOpTerm( Node op );
// compute model basis arg
void computeModelBasisArgAttribute( Node n );
//register instantiation terms with their corresponding model basis terms
void registerModelBasis( Node n, Node gn );
//get model basis
Node getModelBasis( Node n ) { return d_model_basis[n]; }
private:
/** map from universal quantifiers to the list of variables */
std::map< Node, std::vector< Node > > d_vars;
/** map from universal quantifiers to the list of skolem constants */
std::map< Node, std::vector< Node > > d_skolem_constants;
/** map from universal quantifiers to their skolemized body */
std::map< Node, Node > d_skolem_body;
/** instantiation constants to universal quantifiers */
std::map< Node, Node > d_inst_constants_map;
/** map from universal quantifiers to their counterexample body */
std::map< Node, Node > d_counterexample_body;
/** free variable for instantiation constant type */
std::map< TypeNode, Node > d_free_vars;
private:
/** make instantiation constants for */
void makeInstantiationConstantsFor( Node f );
public:
/** map from universal quantifiers to the list of instantiation constants */
std::map< Node, std::vector< Node > > d_inst_constants;
/** set instantiation level attr */
void setInstantiationLevelAttr( Node n, uint64_t level );
/** set instantiation constant attr */
void setInstantiationConstantAttr( Node n, Node f );
/** get the i^th instantiation constant of f */
Node getInstantiationConstant( Node f, int i ) { return d_inst_constants[f][i]; }
/** get number of instantiation constants for f */
int getNumInstantiationConstants( Node f ) { return (int)d_inst_constants[f].size(); }
/** get the ce body f[e/x] */
Node getCounterexampleBody( Node f );
/** get the skolemized body f[e/x] */
Node getSkolemizedBody( Node f );
/** returns node n with bound vars of f replaced by instantiation constants of f
node n : is the futur pattern
node f : is the quantifier containing which bind the variable
return a pattern where the variable are replaced by variable for
instantiation.
*/
Node getSubstitutedNode( Node n, Node f );
/** same as before but node f is just linked to the new pattern by the
applied attribute
vars the bind variable
nvars the same variable but with an attribute
*/
Node convertNodeToPattern( Node n, Node f,
const std::vector<Node> & vars,
const std::vector<Node> & nvars);
/** get free variable for instantiation constant */
Node getFreeVariableForInstConstant( Node n );
//for triggers
private:
/** helper function for compute var contains */
void computeVarContains2( Node n, Node parent );
/** all triggers will be stored in this trie */
TrTrie d_tr_trie;
/** var contains */
std::map< TNode, std::vector< TNode > > d_var_contains;
public:
/** compute var contains */
void computeVarContains( Node n );
/** variables subsume, return true if n1 contains all free variables in n2 */
bool isVariableSubsume( Node n1, Node n2 );
/** get var contains for each of the patterns in pats */
void getVarContains( Node f, std::vector< Node >& pats, std::map< Node, std::vector< Node > >& varContains );
/** get var contains for node n */
void getVarContainsNode( Node f, Node n, std::vector< Node >& varContains );
/** get trigger */
inst::Trigger* getTrigger( std::vector< Node >& nodes ){ return d_tr_trie.getTrigger( nodes ); }
/** add trigger */
void addTrigger( std::vector< Node >& nodes, inst::Trigger* t ){ d_tr_trie.addTrigger( nodes, t ); }
};/* class TermDb */
}/* CVC4::theory::quantifiers namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__QUANTIFIERS__TERM_DATABASE_H */
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