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https://github.com/Z3Prover/z3
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80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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cached_var_subst.cpp
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Abstract:
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<abstract>
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Author:
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Leonardo de Moura (leonardo) 2009-01-23.
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Revision History:
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--*/
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#include"cached_var_subst.h"
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bool cached_var_subst::key_eq_proc::operator()(cached_var_subst::key * k1, cached_var_subst::key * k2) const {
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if (k1->m_qa != k2->m_qa)
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return false;
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if (k1->m_num_bindings != k2->m_num_bindings)
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return false;
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for (unsigned i = 0; i < k1->m_num_bindings; i++)
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if (k1->m_bindings[i] != k2->m_bindings[i])
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return false;
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return true;
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}
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cached_var_subst::cached_var_subst(ast_manager & m):
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m_proc(m),
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m_refs(m) {
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}
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void cached_var_subst::reset() {
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m_refs.reset();
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m_instances.reset();
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m_region.reset();
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m_new_keys.reset();
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}
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void cached_var_subst::operator()(quantifier * qa, unsigned num_bindings, smt::enode * const * bindings, expr_ref & result) {
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m_new_keys.reserve(num_bindings+1, 0);
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key * new_key = m_new_keys[num_bindings];
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if (new_key == 0)
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new_key = static_cast<key*>(m_region.allocate(sizeof(key) + sizeof(expr*)*num_bindings));
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new_key->m_qa = qa;
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new_key->m_num_bindings = num_bindings;
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for (unsigned i = 0; i < num_bindings; i++)
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new_key->m_bindings[i] = bindings[i]->get_owner();
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instances::entry * entry = m_instances.insert_if_not_there2(new_key, 0);
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if (entry->get_data().m_key != new_key) {
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SASSERT(entry->get_data().m_value != 0);
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// entry was already there
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m_new_keys[num_bindings] = new_key; // recycle key
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result = entry->get_data().m_value;
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return;
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}
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m_proc(qa->get_expr(), new_key->m_num_bindings, new_key->m_bindings, result);
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// cache result
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entry->get_data().m_value = result;
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// remove key from cache
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m_new_keys[num_bindings] = 0;
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// increment reference counters
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m_refs.push_back(qa);
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for (unsigned i = 0; i < new_key->m_num_bindings; i++)
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m_refs.push_back(new_key->m_bindings[i]);
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m_refs.push_back(result);
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}
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