mirror of
https://github.com/Z3Prover/z3
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299 lines
9 KiB
C++
299 lines
9 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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smt_for_each_relevant_expr.cpp
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Abstract:
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<abstract>
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Author:
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Leonardo de Moura (leonardo) 2009-01-05.
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Revision History:
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--*/
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#include"smt_context.h"
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#include"smt_for_each_relevant_expr.h"
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#include"ast_pp.h"
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#include"ast_ll_pp.h"
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namespace smt {
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bool check_at_labels::check(expr* n) {
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m_first = true;
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return count_at_labels_pos(n) <= 1;
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}
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unsigned check_at_labels::count_at_labels_lit(expr* n, bool polarity) {
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unsigned count = 0;
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buffer<symbol> lbls;
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bool pos;
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if (m_manager.is_label_lit(n, lbls) || (m_manager.is_label(n, pos, lbls) && pos == polarity)) {
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buffer<symbol>::const_iterator it = lbls.begin();
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buffer<symbol>::const_iterator end = lbls.end();
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for (; it != end; ++it) {
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symbol const & s = *it;
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if (s.contains('@')) {
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TRACE("for_each_relevant_expr", tout << "@ label: " << mk_pp(n, m_manager) << "\n";);
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count += 1;
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}
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}
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}
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return count;
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}
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unsigned check_at_labels::count_at_labels_neg(expr* n) {
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if (!is_app(n)) {
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return 0;
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}
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app* a = to_app(n);
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unsigned sz = a->get_num_args();
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unsigned count = count_at_labels_lit(n, false);
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if (m_manager.is_or(n)) {
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for (unsigned i = 0; i < sz; ++i) {
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count += count_at_labels_neg(a->get_arg(i));
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}
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}
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else if (m_manager.is_not(n)) {
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count = count_at_labels_pos(a->get_arg(0));
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}
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else if (m_manager.is_implies(n)) {
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count += count_at_labels_pos(a->get_arg(0));
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count += count_at_labels_neg(a->get_arg(1));
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}
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else if (m_manager.is_and(n)) {
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for (unsigned i = 0; i < sz; ++i) {
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count = std::max(count, count_at_labels_neg(a->get_arg(i)));
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}
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}
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if (count > 1 && m_first) {
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TRACE("for_each_relevant_expr", tout << mk_pp(n, m_manager) << "\n";);
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m_first = false;
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}
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return count;
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}
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unsigned check_at_labels::count_at_labels_pos(expr* n) {
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if (!is_app(n)) {
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return 0;
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}
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app* a = to_app(n);
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unsigned sz = a->get_num_args();
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unsigned count = count_at_labels_lit(n, true);
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if (m_manager.is_and(n)) {
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for (unsigned i = 0; i < sz; ++i) {
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count += count_at_labels_pos(a->get_arg(i));
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}
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}
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else if (m_manager.is_not(n)) {
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count = count_at_labels_neg(a->get_arg(0));
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}
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else if (m_manager.is_implies(n)) {
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count = std::max(count, count_at_labels_neg(a->get_arg(0)));
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count = std::max(count, count_at_labels_pos(a->get_arg(1)));
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}
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else if (m_manager.is_or(n)) {
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for (unsigned i = 0; i < sz; ++i) {
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count = std::max(count, count_at_labels_pos(a->get_arg(i)));
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}
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}
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if (count > 1 && m_first) {
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TRACE("for_each_relevant_expr", tout << mk_pp(n, m_manager) << "\n";);
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m_first = false;
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}
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return count;
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}
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for_each_relevant_expr::for_each_relevant_expr(context & ctx):
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m_manager(ctx.get_manager()),
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m_context(ctx) {
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}
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void for_each_relevant_expr::operator()(expr * n) {
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TRACE("for_each_relevant_expr", tout << "#" << n->get_id() << "\n";);
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}
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void for_each_relevant_expr::reset() {
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m_todo.reset();
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m_cache.reset();
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}
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inline bool for_each_relevant_expr::is_relevant(expr * n) {
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return m_context.is_relevant(n);
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}
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inline lbool for_each_relevant_expr::get_assignment(expr * n) {
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if (!m_context.lit_internalized(n))
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return l_true; // assume it is a top-level label
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return m_context.get_assignment(n);
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}
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void for_each_relevant_expr::process(expr * n) {
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TRACE("for_each_relevant_expr", tout << "processing:\n" << mk_bounded_pp(n, m_manager) << "\n";);
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TRACE("for_each_relevant_expr", tout << "processing:\n" << mk_pp(n, m_manager) << "\n";);
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if (m_cache.contains(n))
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return;
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m_todo.reset();
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m_todo.push_back(n);
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while (!m_todo.empty()) {
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expr * curr = m_todo.back();
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m_todo.pop_back();
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SASSERT(is_relevant(curr));
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if (m_cache.contains(curr))
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continue;
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operator()(curr);
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m_cache.insert(curr);
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if (!is_app(curr))
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continue;
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if (to_app(curr)->get_family_id() == m_manager.get_basic_family_id()) {
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switch (to_app(curr)->get_decl_kind()) {
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case OP_OR:
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process_or(to_app(curr));
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break;
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case OP_AND:
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process_and(to_app(curr));
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break;
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case OP_ITE:
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process_ite(to_app(curr));
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break;
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default:
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process_app(to_app(curr));
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}
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}
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else {
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process_app(to_app(curr));
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}
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}
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}
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void for_each_relevant_expr::process_app(app * n) {
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unsigned sz = n->get_num_args();
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for (unsigned i = 0; i < sz; i++) {
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expr * arg = n->get_arg(i);
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if (m_cache.contains(arg))
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continue;
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SASSERT(is_relevant(arg));
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m_todo.push_back(arg);
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}
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}
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/**
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\brief Add a relevant child of n (that is assigned to val) to m_todo.
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\remark Give preference to a child that is already in the cache.
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*/
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void for_each_relevant_expr::process_relevant_child(app * n, lbool val) {
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unsigned sz = n->get_num_args();
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TRACE("for_each_relevant_expr", tout << val << " " << mk_bounded_pp(n, m_manager) << "\n";);
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for (unsigned i = 0; i < sz; i++) {
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expr * arg = n->get_arg(i);
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if (!is_relevant(arg))
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continue;
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if (get_assignment(arg) != val)
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continue;
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if (m_cache.contains(arg)) {
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TRACE("for_each_relevant_expr", tout << "justified by: " << mk_bounded_pp(arg, m_manager) << "\n";);
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return; // the current child justifies n.
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}
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}
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for (unsigned i = 0; i < sz; i++) {
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expr * arg = n->get_arg(i);
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if (!is_relevant(arg))
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continue;
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if (get_assignment(arg) != val)
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continue;
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TRACE("for_each_relevant_expr", tout << "to_process: " << mk_bounded_pp(arg, m_manager) << "\n";);
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m_todo.push_back(arg);
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return;
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}
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UNREACHABLE();
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}
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void for_each_relevant_expr::process_and(app * n) {
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switch (get_assignment(n)) {
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case l_undef:
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UNREACHABLE();
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break;
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case l_false:
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process_relevant_child(n, l_false);
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break;
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case l_true:
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process_app(n);
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break;
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}
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}
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void for_each_relevant_expr::process_or(app * n) {
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switch (get_assignment(n)) {
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case l_undef:
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UNREACHABLE();
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break;
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case l_false:
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process_app(n);
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break;
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case l_true:
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process_relevant_child(n, l_true);
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break;
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}
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}
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void for_each_relevant_expr::process_ite(app * n) {
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if (!m_cache.contains(n->get_arg(0)))
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m_todo.push_back(n->get_arg(0));
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switch (get_assignment(n->get_arg(0))) {
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case l_false:
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if (!m_cache.contains(n->get_arg(2)))
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m_todo.push_back(n->get_arg(2));
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break;
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case l_undef:
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UNREACHABLE();
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break;
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case l_true:
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if (!m_cache.contains(n->get_arg(1)))
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m_todo.push_back(n->get_arg(1));
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break;
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}
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}
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void collect_relevant_label_lits::operator()(expr * n) {
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TRACE("for_each_relevant_expr",
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tout << "label: " << m_manager.is_label_lit(n) << " " << " " << get_assignment(n)
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<< " " << mk_bounded_pp(n, m_manager) << "\n";);
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if (!m_manager.is_label_lit(n))
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return;
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if (get_assignment(n) != l_true)
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return;
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m_manager.is_label_lit(n, m_buffer); // copy symbols to buffer
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}
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void collect_relevant_labels::operator()(expr * n) {
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bool pos;
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TRACE("for_each_relevant_expr",
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tout << "label: " << m_manager.is_label(n) << " " << get_assignment(n)
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<< " " << mk_bounded_pp(n, m_manager) << "\n";);
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if (!m_manager.is_label(n, pos))
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return;
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if (pos && (get_assignment(n) != l_true))
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return;
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if (!pos && (get_assignment(n) != l_false))
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return;
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m_manager.is_label(n, pos, m_buffer); // copy symbols to buffer
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}
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};
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