z3-z3-4.13.0.src.ast.shared_occs.h Maven / Gradle / Ivy
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/*++
Copyright (c) 2011 Microsoft Corporation
Module Name:
shared_occs.h
Abstract:
Functor for computing the shared subterms in a given
term.
Author:
Leonardo de Moura (leonardo) 2011-04-01.
Revision History:
--*/
#pragma once
#include "ast/ast.h"
#include "util/obj_hashtable.h"
class shared_occs_mark {
ptr_buffer m_to_unmark;
public:
~shared_occs_mark() {
reset();
}
bool is_marked(ast * n) { return n->is_marked_so(); }
void reset_mark(ast * n) { n->reset_mark_so(); }
void mark(ast * n) { if (is_marked(n)) return; n->mark_so(true); m_to_unmark.push_back(n); }
void reset() {
for (auto* t : m_to_unmark)
reset_mark(t);
m_to_unmark.reset();
}
void mark(ast * n, bool flag) { if (flag) mark(n); else reset_mark(n); }
};
/**
\brief Functor for computing the shared subterms in a given term.
*/
class shared_occs {
ast_manager & m;
bool m_track_atomic;
bool m_visit_quantifiers;
bool m_visit_patterns;
expr_ref_vector m_shared;
typedef std::pair frame;
svector m_stack;
bool process(expr * t, shared_occs_mark & visited);
void insert(expr * t);
public:
typedef obj_hashtable::iterator iterator;
shared_occs(ast_manager & _m, bool track_atomic = false, bool visit_quantifiers = true, bool visit_patterns = false):
m(_m),
m_track_atomic(track_atomic),
m_visit_quantifiers(visit_quantifiers),
m_visit_patterns(visit_patterns),
m_shared(m) {
}
~shared_occs();
void operator()(expr * t);
void operator()(expr * t, shared_occs_mark & visited);
bool is_shared(expr * t) const { return m_shared.get(t->get_id(), nullptr) != nullptr; }
unsigned num_shared() const;
void reset();
void cleanup();
void display(std::ostream & out, ast_manager & mgr) const;
};