mirror of
https://github.com/Z3Prover/z3
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133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
/*++
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Copyright (c) 2022 Microsoft Corporation
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Module Name:
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then_simplifier.h
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Abstract:
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create a simplifier from a sequence of simplifiers
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Author:
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Nikolaj Bjorner (nbjorner) 2022-11-24
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--*/
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#pragma once
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#include "util/stopwatch.h"
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#include "ast/simplifiers/dependent_expr_state.h"
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class then_simplifier : public dependent_expr_simplifier {
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scoped_ptr_vector<dependent_expr_simplifier> m_simplifiers;
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struct collect_stats {
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stopwatch m_watch;
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double m_start_memory = 0;
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dependent_expr_simplifier& s;
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collect_stats(dependent_expr_simplifier& s) :
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m_start_memory(static_cast<double>(memory::get_allocation_size()) / static_cast<double>(1024 * 1024)),
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s(s) {
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m_watch.start();
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}
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~collect_stats() {
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m_watch.stop();
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double end_memory = static_cast<double>(memory::get_allocation_size()) / static_cast<double>(1024 * 1024);
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IF_VERBOSE(10,
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statistics st;
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verbose_stream() << "(" << s.name()
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<< " :num-exprs " << s.get_fmls().num_exprs()
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<< " :num-asts " << s.get_manager().get_num_asts()
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<< " :time " << std::fixed << std::setprecision(2) << m_watch.get_seconds()
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<< " :before-memory " << std::fixed << std::setprecision(2) << m_start_memory
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<< " :after-memory " << std::fixed << std::setprecision(2) << end_memory
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<< ")" << "\n";
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s.collect_statistics(st);
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if (st.size() > 0)
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st.display_smt2(verbose_stream()));
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}
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};
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protected:
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bool m_bail_on_no_change = false;
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public:
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then_simplifier(ast_manager& m, params_ref const& p, dependent_expr_state& fmls):
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dependent_expr_simplifier(m, fmls) {
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}
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char const* name() const override { return "and-then"; }
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void add_simplifier(dependent_expr_simplifier* s) {
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m_simplifiers.push_back(s);
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}
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void reduce() override {
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TRACE("simplifier", tout << m_fmls);
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for (auto* s : m_simplifiers) {
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if (m_fmls.inconsistent())
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break;
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if (!m.inc())
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break;
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s->reset_statistics();
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collect_stats _cs(*s);
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m_fmls.reset_updated();
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try {
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s->reduce();
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m_fmls.flatten_suffix();
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}
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catch (rewriter_exception &) {
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break;
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}
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TRACE("simplifier", tout << s->name() << "\n" << m_fmls);
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if (m_bail_on_no_change && !m_fmls.updated())
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break;
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}
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}
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void collect_statistics(statistics& st) const override {
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for (auto* s : m_simplifiers)
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s->collect_statistics(st);
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}
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void reset_statistics() override {
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for (auto* s : m_simplifiers)
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s->reset_statistics();
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}
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void updt_params(params_ref const& p) override {
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for (auto* s : m_simplifiers)
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s->updt_params(p);
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}
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void collect_param_descrs(param_descrs& r) override {
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for (auto* s : m_simplifiers)
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s->collect_param_descrs(r);
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}
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void push() override {
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for (auto* s : m_simplifiers)
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s->push();
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}
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void pop(unsigned n) override {
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for (auto* s : m_simplifiers)
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s->pop(n);
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}
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};
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class if_change_simplifier : public then_simplifier {
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public:
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if_change_simplifier(ast_manager& m, params_ref const& p, dependent_expr_state& fmls):
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then_simplifier(m, p, fmls) {
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m_bail_on_no_change = true;
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}
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char const* name() const override { return "if-change-then"; }
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};
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