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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds, 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.
* ****************************************************************************
*
* Attributes for the theory quantifiers.
*/
#include "cvc5_private.h"
#ifndef CVC5__THEORY__QUANTIFIERS__QUANTIFIERS_ATTRIBUTES_H
#define CVC5__THEORY__QUANTIFIERS__QUANTIFIERS_ATTRIBUTES_H
#include "expr/attribute.h"
#include "expr/node.h"
namespace cvc5 {
namespace theory {
/** Attribute true for function definition quantifiers */
struct FunDefAttributeId {};
typedef expr::Attribute< FunDefAttributeId, bool > FunDefAttribute;
/** Attribute true for quantifiers that we are doing quantifier elimination on */
struct QuantElimAttributeId {};
typedef expr::Attribute< QuantElimAttributeId, bool > QuantElimAttribute;
/** Attribute true for quantifiers that we are doing partial quantifier elimination on */
struct QuantElimPartialAttributeId {};
typedef expr::Attribute< QuantElimPartialAttributeId, bool > QuantElimPartialAttribute;
/** Attribute true for quantifiers that are SyGus conjectures */
struct SygusAttributeId {};
typedef expr::Attribute< SygusAttributeId, bool > SygusAttribute;
/**Attribute to give names to quantified formulas */
struct QuantNameAttributeId
{
};
typedef expr::Attribute<QuantNameAttributeId, bool> QuantNameAttribute;
struct InstLevelAttributeId
{
};
typedef expr::Attribute<InstLevelAttributeId, uint64_t> InstLevelAttribute;
/** Attribute for setting printing information for sygus variables
*
* For variable d of sygus datatype type, if
* d.getAttribute(SygusPrintProxyAttribute) = t, then printing d will print t.
*/
struct SygusPrintProxyAttributeId
{
};
typedef expr::Attribute<SygusPrintProxyAttributeId, Node>
SygusPrintProxyAttribute;
/** Attribute for specifying a "side condition" for a sygus conjecture
*
* A sygus conjecture of the form exists f. forall x. P[f,x] whose side
* condition is C[f] has the semantics exists f. C[f] ^ forall x. P[f,x].
*/
struct SygusSideConditionAttributeId
{
};
typedef expr::Attribute<SygusSideConditionAttributeId, Node>
SygusSideConditionAttribute;
/** Attribute for indicating that a sygus variable encodes a term
*
* This is used, e.g., for abduction where the formal argument list of the
* abduct-to-synthesize corresponds to the free variables of the sygus
* problem.
*/
struct SygusVarToTermAttributeId
{
};
typedef expr::Attribute<SygusVarToTermAttributeId, Node>
SygusVarToTermAttribute;
/**
* Attribute marked true for types that are used as abstraction types in
* the finite model finding for function definitions algorithm.
*/
struct AbsTypeFunDefAttributeId
{
};
typedef expr::Attribute<AbsTypeFunDefAttributeId, bool> AbsTypeFunDefAttribute;
/**
* Attribute true for quantifiers that have been internally generated, e.g.
* for reductions of string operators.
*
* Currently, this attribute is used for indicating that E-matching should
* not be applied, as E-matching should not be applied to quantifiers
* generated for strings reductions.
*
* This attribute can potentially be generalized to an identifier indicating
* the internal source of the quantified formula (of which strings reduction
* is one possibility).
*/
struct InternalQuantAttributeId
{
};
typedef expr::Attribute<InternalQuantAttributeId, bool> InternalQuantAttribute;
namespace quantifiers {
/** This struct stores attributes for a single quantified formula */
struct QAttributes
{
public:
QAttributes()
: d_hasPattern(false),
d_hasPool(false),
d_sygus(false),
d_qinstLevel(-1),
d_quant_elim(false),
d_quant_elim_partial(false),
d_isInternal(false)
{
}
~QAttributes(){}
/** does the quantified formula have a pattern? */
bool d_hasPattern;
/** does the quantified formula have a pool? */
bool d_hasPool;
/** if non-null, this quantified formula is a function definition for function
* d_fundef_f */
Node d_fundef_f;
/** is this formula marked as a sygus conjecture? */
bool d_sygus;
/** side condition for sygus conjectures */
Node d_sygusSideCondition;
/** stores the maximum instantiation level allowed for this quantified formula
* (-1 means allow any) */
int64_t d_qinstLevel;
/** is this formula marked for quantifier elimination? */
bool d_quant_elim;
/** is this formula marked for partial quantifier elimination? */
bool d_quant_elim_partial;
/** Is this formula internally generated? */
bool d_isInternal;
/** the instantiation pattern list for this quantified formula (its 3rd child)
*/
Node d_ipl;
/** The name of this quantified formula, used for :qid */
Node d_name;
/** The (internal) quantifier id associated with this formula */
Node d_qid_num;
/** is this quantified formula a function definition? */
bool isFunDef() const { return !d_fundef_f.isNull(); }
/**
* Is this a standard quantifier? A standard quantifier is one that we can
* perform destructive updates (variable elimination, miniscoping, etc).
*
* A quantified formula is not standard if it is sygus, one for which
* we are performing quantifier elimination, is a function definition, or
* has a name.
*/
bool isStandard() const;
};
/** This class caches information about attributes of quantified formulas
*
* It also has static utility functions used for determining attributes and
* information about
* quantified formulas.
*/
class QuantAttributes
{
public:
QuantAttributes();
~QuantAttributes(){}
/** set user attribute
* This function applies an attribute
* This can be called when we mark expressions with attributes, e.g. (! q
* :attribute attr [node_values, str_value...]),
* It can also be called internally in various ways (for SyGus, quantifier
* elimination, etc.)
*/
static void setUserAttribute(const std::string& attr,
Node q,
std::vector<Node>& node_values,
std::string str_value);
/** compute quantifier attributes */
static void computeQuantAttributes(Node q, QAttributes& qa);
/** compute the attributes for q */
void computeAttributes(Node q);
/** is fun def */
static bool checkFunDef( Node q );
/** is fun def */
static bool checkFunDefAnnotation( Node ipl );
/** is sygus conjecture */
static bool checkSygusConjecture( Node q );
/** is sygus conjecture */
static bool checkSygusConjectureAnnotation( Node ipl );
/** get fun def body */
static Node getFunDefHead( Node q );
/** get fun def body */
static Node getFunDefBody( Node q );
/** is quant elim annotation */
static bool checkQuantElimAnnotation( Node ipl );
/** is function definition */
bool isFunDef( Node q );
/** is sygus conjecture */
bool isSygus( Node q );
/** get instantiation level */
int64_t getQuantInstLevel(Node q);
/** is quant elim */
bool isQuantElim( Node q );
/** is quant elim partial */
bool isQuantElimPartial( Node q );
/** is internal quantifier */
bool isInternal(Node q) const;
/** get quant name, which is used for :qid */
Node getQuantName(Node q) const;
/** Print quantified formula q, possibly using its name, if it has one */
std::string quantToString(Node q) const;
/** get (internal) quant id num */
int getQuantIdNum( Node q );
/** get (internal)quant id num */
Node getQuantIdNumNode( Node q );
/** set instantiation level attr */
static void setInstantiationLevelAttr(Node n, uint64_t level);
/** set instantiation level attr */
static void setInstantiationLevelAttr(Node n, Node qn, uint64_t level);
private:
/** cache of attributes */
std::map< Node, QAttributes > d_qattr;
/** function definitions */
std::map< Node, bool > d_fun_defs;
};
}
}
} // namespace cvc5
#endif
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