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https://github.com/Z3Prover/z3
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99 lines
2.7 KiB
C++
99 lines
2.7 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 "ast/rewriter/cached_var_subst.h"
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#include "ast/rewriter/rewriter_def.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(_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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m_key = nullptr;
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}
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expr** cached_var_subst::operator()(quantifier* qa, unsigned num_bindings) {
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m_new_keys.reserve(num_bindings+1, 0);
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m_key = m_new_keys[num_bindings];
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if (m_key == nullptr)
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m_key = static_cast<key*>(m_region.allocate(sizeof(key) + sizeof(expr*)*num_bindings));
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m_key->m_qa = qa;
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m_key->m_num_bindings = num_bindings;
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return m_key->m_bindings;
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}
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expr_ref cached_var_subst::operator()() {
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expr_ref result(m);
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auto* entry = m_instances.insert_if_not_there3(m_key, nullptr);
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unsigned num_bindings = m_key->m_num_bindings;
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if (entry->get_data().m_key != m_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] = m_key; // recycle key
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result = entry->get_data().m_value;
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SCTRACE("bindings", is_trace_enabled("coming_from_quant"), tout << "(cache)\n";
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for (unsigned i = 0; i < num_bindings; i++)
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if (m_key->m_bindings[i])
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tout << i << ": " << mk_ismt2_pp(m_key->m_bindings[i], result.m()) << ";\n";
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tout.flush(););
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return result;
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}
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SASSERT(entry->get_data().m_value == 0);
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try {
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result = m_proc(m_key->m_qa->get_expr(), m_key->m_num_bindings, m_key->m_bindings);
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}
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catch (...) {
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// CMW: The var_subst reducer was interrupted and m_instances is
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// in an inconsistent state; we need to remove (m_key, 0).
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m_instances.remove(m_key);
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throw;
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}
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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] = nullptr;
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// increment reference counters
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m_refs.push_back(m_key->m_qa);
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for (unsigned i = 0; i < m_key->m_num_bindings; i++)
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m_refs.push_back(m_key->m_bindings[i]);
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m_refs.push_back(result);
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return result;
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}
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