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https://github.com/Z3Prover/z3
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95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
/*++
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Copyright (c) 2007 Microsoft Corporation
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Module Name:
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simplifier_plugin.h
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Abstract:
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Expression simplifier plugin interface.
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Author:
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Leonardo (leonardo) 2008-01-03
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--*/
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#ifndef __SIMPLIFIER_PLUGIN_H__
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#define __SIMPLIFIER_PLUGIN_H__
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#include"ast.h"
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class simplifier;
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void expand_args(unsigned num_args, rational const * mults, expr * const * args, ptr_buffer<expr> & new_args);
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/**
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\brief Abstract simplifier for the operators in a given family.
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*/
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class simplifier_plugin {
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protected:
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ast_manager & m_manager;
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family_id m_fid;
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bool m_presimp; // true if simplifier is performing pre-simplification...
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bool m_reduce_invoked; // true if one of the reduce methods were invoked.
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void set_reduce_invoked() { m_reduce_invoked = true; }
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public:
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simplifier_plugin(symbol const & fname, ast_manager & m):m_manager(m), m_fid(m.get_family_id(fname)), m_presimp(false), m_reduce_invoked(false) {}
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bool reduce_invoked() const { return m_reduce_invoked; }
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virtual ~simplifier_plugin() {}
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virtual simplifier_plugin * mk_fresh() {
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UNREACHABLE();
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return 0;
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}
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/**
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\brief Return in \c result an expression \c e equivalent to <tt>(f args[0] ... args[num_args - 1])</tt>.
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Return true if succeeded.
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*/
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virtual bool reduce(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) { set_reduce_invoked(); return false; }
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/**
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\brief Return in \c result an expression \c e equivalent to <tt>(f args[0] ... args[0] ... args[num_args - 1])</tt>.
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Where each args[i] occurs mults[i] times.
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Return true if succeeded.
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*/
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virtual bool reduce(func_decl * f, unsigned num_args, rational const * mults, expr * const * args, expr_ref & result);
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/**
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\brief Return in \c result an expression \c e equivalent to <tt>(= lhs rhs)</tt>.
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Return true if succeeded.
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*/
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virtual bool reduce_eq(expr * lhs, expr * rhs, expr_ref & result) { set_reduce_invoked(); return false; }
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/**
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\brief Return in \c result an expression \c e equivalent to <tt>(distinct args[0] ... args[num_args-1])</tt>.
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Return true if succeeded.
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*/
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virtual bool reduce_distinct(unsigned num_args, expr * const * args, expr_ref & result) { set_reduce_invoked(); return false; }
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family_id get_family_id() const { return m_fid; }
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/**
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\brief Simplifiers may maintain local caches. These caches must be flushed when this method is invoked.
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*/
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virtual void flush_caches() { /* do nothing */ }
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ast_manager & get_manager() { return m_manager; }
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void enable_presimp(bool flag) { m_presimp = flag; }
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virtual void enable_ac_support(bool flag) {}
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};
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#endif
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