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74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*++
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Copyright (c) 2010 Microsoft Corporation
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Module Name:
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quant_hoist.h
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Abstract:
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Quantifier hoisting utility.
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Author:
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Nikolaj Bjorner (nbjorner) 2010-02-19
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Revision History:
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Hoisted from quant_elim.
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--*/
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#ifndef __QUANTIFIER_HOISTER_H_
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#define __QUANTIFIER_HOISTER_H_
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#include "ast.h"
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class quantifier_hoister {
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class impl;
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impl* m_impl;
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public:
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quantifier_hoister(ast_manager& m);
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~quantifier_hoister();
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/**
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\brief Pull top-most quantifier up.
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Create fresh constants for the bound variables.
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Return the constants, the quantifier type (forall or exists), and
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the sub-formula under the quantifier.
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The list of variables is empty if the formula is quantifier free or
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if the existing quantifiers occur under a connective other than
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or, and, implies, ite (then and else branch only).
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*/
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void operator()(expr* fml, app_ref_vector& vars, bool& is_fa, expr_ref& result);
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/**
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\brief Pull top-most existential quantifier up.
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The list of variables is empty if there are no top-level existential quantifier.
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*/
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void pull_exists(expr* fml, app_ref_vector& vars, expr_ref& result);
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/**
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\brief Pull top-most universal (is_forall=true) or existential (is_forall=false) quantifier up.
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The list of variables is empty if there are no top-level universal/existential quantifier.
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*/
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void pull_quantifier(bool is_forall, expr_ref& fml, app_ref_vector& vars);
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/**
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\brief Pull top-most universal (is_forall true) or existential (is_forall=false) quantifier up.
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Return an expression with de-Bruijn indices and the list of names that were used.
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Return index of maximal variable.
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*/
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unsigned pull_quantifier(bool is_forall, expr_ref& fml, ptr_vector<sort>* sorts, svector<symbol>* names);
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};
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#endif
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