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79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
/*++
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Copyright (c) 2007 Microsoft Corporation
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Module Name:
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var_subst.h
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Abstract:
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Variable substitution.
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Author:
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Leonardo (leonardo) 2008-01-10
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Notes:
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--*/
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#ifndef _VAR_SUBST_H_
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#define _VAR_SUBST_H_
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#include"rewriter.h"
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/**
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\brief Alias for var_shifter class.
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*/
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typedef var_shifter shift_vars;
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/**
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\brief Variable substitution functor. It substitutes variables by expressions.
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The expressions may contain variables.
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*/
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class var_subst {
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beta_reducer m_reducer;
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bool m_std_order;
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public:
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var_subst(ast_manager & m, bool std_order = true):m_reducer(m), m_std_order(std_order) {}
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bool std_order() const { return m_std_order; }
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/**
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When std_order() == true,
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I'm using the same standard used in quantifier instantiation.
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(VAR 0) is stored in the last position of the array.
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...
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(VAR (num_args - 1)) is stored in the first position of the array.
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Otherwise, (VAR 0) is stored in the first position, (VAR 1) in the second, and so on.
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*/
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void operator()(expr * n, unsigned num_args, expr * const * args, expr_ref & result);
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void reset() { m_reducer.reset(); }
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};
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/**
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\brief Eliminate the unused variables from \c q. Store the result in \c r.
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*/
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void elim_unused_vars(ast_manager & m, quantifier * q, expr_ref & r);
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/**
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\brief Instantiate quantifier q using the given exprs.
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The vector exprs should contain at least q->get_num_decls() expressions.
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I'm using the same standard used in quantifier instantiation.
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(VAR 0) is stored in the last position of the array.
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...
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(VAR (q->get_num_decls() - 1)) is stored in the first position of the array.
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*/
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void instantiate(ast_manager & m, quantifier * q, expr * const * exprs, expr_ref & result);
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/**
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\brief Enumerate set of free variables in expression.
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Return the sorts of the free variables.
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*/
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void get_free_vars(expr* e, ptr_vector<sort>& sorts);
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#endif
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