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https://github.com/Z3Prover/z3
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more integration
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
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c7d0d4e191
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@ -1614,23 +1614,22 @@ namespace smt {
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void insert_macro(func_decl * f, quantifier * m, proof * pr, expr_dependency * dep) { m_asserted_formulas.insert_macro(f, m, pr, dep); }
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};
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struct pp_lit {
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smt::context & ctx;
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smt::literal lit;
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pp_lit(smt::context & ctx, smt::literal lit) : ctx(ctx), lit(lit) {}
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context & ctx;
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literal lit;
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pp_lit(context & ctx, literal lit) : ctx(ctx), lit(lit) {}
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};
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inline std::ostream & operator<<(std::ostream & out, pp_lit const & pp) {
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pp.ctx.display_detailed_literal(out, pp.lit);
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return out;
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return pp.ctx.display_detailed_literal(out, pp.lit);
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}
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struct pp_lits {
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smt::context & ctx;
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smt::literal *lits;
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context & ctx;
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literal const *lits;
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unsigned len;
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pp_lits(smt::context & ctx, unsigned len, smt::literal *lits) : ctx(ctx), lits(lits), len(len) {}
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pp_lits(context & ctx, unsigned len, literal const *lits) : ctx(ctx), lits(lits), len(len) {}
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pp_lits(context & ctx, literal_vector const& ls) : ctx(ctx), lits(ls.c_ptr()), len(ls.size()) {}
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};
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inline std::ostream & operator<<(std::ostream & out, pp_lits const & pp) {
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@ -1,11 +1,29 @@
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/*++
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Copyright (c) 2018 Microsoft Corporation, Simon Cuares
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Module Name:
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theory_recfun.cpp
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Abstract:
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Theory responsible for unrolling recursive functions
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Author:
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Simon Cuares December 2017
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Revision History:
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--*/
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#include "util/stats.h"
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#include "ast/ast_util.h"
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#include "smt/theory_recfun.h"
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#include "smt/params/smt_params_helper.hpp"
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#define DEBUG(x) TRACE("recfun", tout << x << '\n';)
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#define TRACEFN(x) TRACE("recfun", tout << x << '\n';)
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namespace smt {
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@ -14,7 +32,11 @@ namespace smt {
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m_plugin(*reinterpret_cast<recfun_decl_plugin*>(m.get_plugin(get_family_id()))),
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m_util(m_plugin.u()),
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m_trail(*this),
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m_guards(), m_max_depth(0), m_q_case_expand(), m_q_body_expand(), m_q_clauses()
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m_guards(),
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m_max_depth(0),
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m_q_case_expand(),
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m_q_body_expand(),
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m_q_clauses()
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{
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}
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@ -40,13 +62,13 @@ namespace smt {
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bool theory_recfun::internalize_atom(app * atom, bool gate_ctx) {
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context & ctx = get_context();
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if (! ctx.e_internalized(atom)) {
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unsigned num_args = atom->get_num_args();
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for (unsigned i = 0; i < num_args; ++i)
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ctx.internalize(atom->get_arg(i), false);
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for (expr * arg : *atom) {
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ctx.internalize(arg, false);
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}
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if (!ctx.e_internalized(atom)) {
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ctx.mk_enode(atom, false, true, false);
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}
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if (! ctx.b_internalized(atom)) {
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if (!ctx.b_internalized(atom)) {
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bool_var v = ctx.mk_bool_var(atom);
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ctx.set_var_theory(v, get_id());
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}
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@ -55,12 +77,14 @@ namespace smt {
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bool theory_recfun::internalize_term(app * term) {
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context & ctx = get_context();
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for (expr* e : *term) ctx.internalize(e, false);
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for (expr* e : *term) {
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ctx.internalize(e, false);
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}
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// the internalization of the arguments may have triggered the internalization of term.
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if (ctx.e_internalized(term))
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return true;
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ctx.mk_enode(term, false, false, true);
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return true; // the theory doesn't actually map terms to variables
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if (!ctx.e_internalized(term)) {
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ctx.mk_enode(term, false, false, true);
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}
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return true;
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}
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void theory_recfun::reset_queues() {
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@ -77,35 +101,34 @@ namespace smt {
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}
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/*
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* when `n` becomes relevant, if it's `f(t1…tn)` with `f` defined,
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* when `n` becomes relevant, if it's `f(t1...tn)` with `f` defined,
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* then case-expand `n`. If it's a macro we can also immediately
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* body-expand it.
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*/
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void theory_recfun::relevant_eh(app * n) {
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SASSERT(get_context().relevancy());
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if (u().is_defined(n)) {
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DEBUG("relevant_eh: (defined) " << mk_pp(n, m()));
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TRACEFN("relevant_eh: (defined) " << mk_pp(n, m()));
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case_expansion e(u(), n);
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push_case_expand(std::move(e));
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}
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}
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void theory_recfun::push_scope_eh() {
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DEBUG("push_scope");
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TRACEFN("push_scope");
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theory::push_scope_eh();
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m_trail.push_scope();
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}
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void theory_recfun::pop_scope_eh(unsigned num_scopes) {
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DEBUG("pop_scope " << num_scopes);
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TRACEFN("pop_scope " << num_scopes);
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m_trail.pop_scope(num_scopes);
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theory::pop_scope_eh(num_scopes);
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reset_queues();
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}
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void theory_recfun::restart_eh() {
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DEBUG("restart");
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TRACEFN("restart");
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reset_queues();
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theory::restart_eh();
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}
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@ -120,7 +143,7 @@ namespace smt {
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context & ctx = get_context();
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for (literal_vector & c : m_q_clauses) {
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DEBUG("add axiom " << pp_lits(ctx, c.size(), c.c_ptr()));
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TRACEFN("add axiom " << pp_lits(ctx, c));
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ctx.mk_th_axiom(get_id(), c.size(), c.c_ptr());
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}
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m_q_clauses.clear();
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@ -145,7 +168,7 @@ namespace smt {
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}
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void theory_recfun::max_depth_conflict() {
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DEBUG("max-depth conflict");
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TRACEFN("max-depth conflict");
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context & ctx = get_context();
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literal_vector c;
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// make clause `depth_limit => V_{g : guards} ~ g`
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@ -160,20 +183,20 @@ namespace smt {
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expr * g = & kv.get_key();
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c.push_back(~ ctx.get_literal(g));
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}
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DEBUG("max-depth limit: add clause " << pp_lits(ctx, c.size(), c.c_ptr()));
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TRACEFN("max-depth limit: add clause " << pp_lits(ctx, c));
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SASSERT(std::all_of(c.begin(), c.end(), [&](literal & l) { return ctx.get_assignment(l) == l_false; })); // conflict
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m_q_clauses.push_back(std::move(c));
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}
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// if `is_true` and `v = C_f_i(t1…tn)`, then body-expand i-th case of `f(t1…tn)`
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// if `is_true` and `v = C_f_i(t1...tn)`, then body-expand i-th case of `f(t1…tn)`
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void theory_recfun::assign_eh(bool_var v, bool is_true) {
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expr* e = get_context().bool_var2expr(v);
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if (!is_true) return;
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if (!is_app(e)) return;
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app* a = to_app(e);
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if (u().is_case_pred(a)) {
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DEBUG("assign_case_pred_true "<< mk_pp(e,m()));
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TRACEFN("assign_case_pred_true "<< mk_pp(e,m()));
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// add to set of local assumptions, for depth-limit purpose
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{
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m_guards.insert(e, empty());
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@ -207,20 +230,19 @@ namespace smt {
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}
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app_ref theory_recfun::apply_pred(recfun::case_pred const & p,
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ptr_vector<expr> const & args){
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app_ref res(u().mk_case_pred(p, args), m());
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return res;
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ptr_vector<expr> const & args) {
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return app_ref(u().mk_case_pred(p, args), m());
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}
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void theory_recfun::assert_macro_axiom(case_expansion & e) {
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DEBUG("assert_macro_axiom " << pp_case_expansion(e,m()));
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TRACEFN("assert_macro_axiom " << pp_case_expansion(e,m()));
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SASSERT(e.m_def->is_fun_macro());
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expr_ref lhs(e.m_lhs, m());
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context & ctx = get_context();
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auto & vars = e.m_def->get_vars();
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// substitute `e.args` into the macro RHS
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expr_ref rhs(apply_args(vars, e.m_args, e.m_def->get_macro_rhs()), m());
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DEBUG("macro expansion yields" << mk_pp(rhs,m()));
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TRACEFN("macro expansion yields" << mk_pp(rhs,m()));
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// now build the axiom `lhs = rhs`
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ctx.internalize(rhs, false);
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// add unit clause `lhs=rhs`
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ctx.mark_as_relevant(l);
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literal_vector lits;
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lits.push_back(l);
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DEBUG("assert_macro_axiom: " << pp_lits(ctx, lits.size(), lits.c_ptr()));
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TRACEFN("assert_macro_axiom: " << pp_lits(ctx, lits));
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ctx.mk_th_axiom(get_id(), lits.size(), lits.c_ptr());
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}
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void theory_recfun::assert_case_axioms(case_expansion & e) {
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DEBUG("assert_case_axioms "<< pp_case_expansion(e,m())
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TRACEFN("assert_case_axioms "<< pp_case_expansion(e,m())
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<< " with " << e.m_def->get_cases().size() << " cases");
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SASSERT(e.m_def->is_fun_defined());
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context & ctx = get_context();
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//TRACE("recfun", tout << "assert_case_axioms " << pp_case_expansion(e)
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// << " axiom " << mk_pp(*l) <<"\n";);
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DEBUG("assert_case_axiom " << pp_lits(get_context(), path.size()+1, c.c_ptr()));
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TRACEFN("assert_case_axiom " << pp_lits(get_context(), path.size()+1, c.c_ptr()));
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get_context().mk_th_axiom(get_id(), path.size()+1, c.c_ptr());
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}
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{
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literal g = ctx.get_literal(_g);
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literal c[2] = {~ concl, g};
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DEBUG("assert_case_axiom " << pp_lits(get_context(), 2, c));
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TRACEFN("assert_case_axiom " << pp_lits(get_context(), 2, c));
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get_context().mk_th_axiom(get_id(), 2, c);
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}
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}
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}
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void theory_recfun::assert_body_axiom(body_expansion & e) {
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DEBUG("assert_body_axioms "<< pp_body_expansion(e,m()));
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TRACEFN("assert_body_axioms "<< pp_body_expansion(e,m()));
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context & ctx = get_context();
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recfun::def & d = *e.m_cdef->get_def();
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auto & vars = d.get_vars();
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literal l(mk_eq(lhs, rhs, true));
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ctx.mark_as_relevant(l);
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clause.push_back(l);
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DEBUG("assert_body_axiom " << pp_lits(ctx, clause.size(), clause.c_ptr()));
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TRACEFN("assert_body_axiom " << pp_lits(ctx, clause));
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ctx.mk_th_axiom(get_id(), clause.size(), clause.c_ptr());
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}
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void theory_recfun::add_theory_assumptions(expr_ref_vector & assumptions) {
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app_ref dlimit = m_util.mk_depth_limit_pred(get_max_depth());
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DEBUG("add_theory_assumption " << mk_pp(dlimit.get(), m()));
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TRACEFN("add_theory_assumption " << mk_pp(dlimit.get(), m()));
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assumptions.push_back(dlimit);
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}
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st.update("recfun body expansion", m_stats.m_body_expansions);
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}
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#ifdef Z3DEBUG
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std::ostream& operator<<(std::ostream & out, theory_recfun::pp_case_expansion const & e) {
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return out << "case_exp(" << mk_pp(e.e.m_lhs, e.m) << ")";
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}
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}
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return out << ")";
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}
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#endif
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}
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@ -1,5 +1,5 @@
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/*++
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Copyright (c) 2006 Microsoft Corporation
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Copyright (c) 2018 Microsoft Corporation
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Module Name:
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@ -11,7 +11,7 @@ Abstract:
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Author:
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Leonardo de Moura (leonardo) 2008-10-31.
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Simon Cuares December 2017
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Revision History:
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