101 lines
4.8 KiB
C++
101 lines
4.8 KiB
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "kernel/declaration.h"
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#include "kernel/environment.h"
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#include "kernel/for_each_fn.h"
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namespace lean {
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struct declaration::cell {
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MK_LEAN_RC();
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name m_name;
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level_param_names m_params;
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expr m_type;
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bool m_theorem;
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optional<expr> m_value; // if none, then declaration is actually a postulate
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// The following fields are only meaningful for definitions (which are not theorems)
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unsigned m_weight;
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unsigned m_module_idx; // module idx where it was defined
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bool m_opaque;
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// The following field affects the convertability checker.
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// Let f be this definition, then if the following field is true,
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// then whenever we are checking whether
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// (f a) is convertible to (f b)
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// we will first check whether a is convertible to b.
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// If the test fails, then we perform the full check.
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bool m_use_conv_opt;
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void dealloc() { delete this; }
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cell(name const & n, level_param_names const & params, expr const & t, bool is_axiom):
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m_rc(1), m_name(n), m_params(params), m_type(t), m_theorem(is_axiom),
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m_weight(0), m_module_idx(0), m_opaque(true), m_use_conv_opt(false) {}
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cell(name const & n, level_param_names const & params, expr const & t, bool is_thm, expr const & v,
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bool opaque, unsigned w, module_idx mod_idx, bool use_conv_opt):
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m_rc(1), m_name(n), m_params(params), m_type(t), m_theorem(is_thm),
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m_value(v), m_weight(w), m_module_idx(mod_idx), m_opaque(opaque), m_use_conv_opt(use_conv_opt) {}
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};
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static declaration * g_dummy = nullptr;
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declaration::declaration():declaration(*g_dummy) {}
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declaration::declaration(cell * ptr):m_ptr(ptr) {}
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declaration::declaration(declaration const & s):m_ptr(s.m_ptr) { if (m_ptr) m_ptr->inc_ref(); }
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declaration::declaration(declaration && s):m_ptr(s.m_ptr) { s.m_ptr = nullptr; }
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declaration::~declaration() { if (m_ptr) m_ptr->dec_ref(); }
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declaration & declaration::operator=(declaration const & s) { LEAN_COPY_REF(s); }
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declaration & declaration::operator=(declaration && s) { LEAN_MOVE_REF(s); }
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bool declaration::is_definition() const { return static_cast<bool>(m_ptr->m_value); }
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bool declaration::is_constant_assumption() const { return !is_definition(); }
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bool declaration::is_axiom() const { return is_constant_assumption() && m_ptr->m_theorem; }
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bool declaration::is_theorem() const { return is_definition() && m_ptr->m_theorem; }
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name const & declaration::get_name() const { return m_ptr->m_name; }
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level_param_names const & declaration::get_univ_params() const { return m_ptr->m_params; }
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expr const & declaration::get_type() const { return m_ptr->m_type; }
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bool declaration::is_opaque() const { return m_ptr->m_opaque; }
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expr const & declaration::get_value() const { lean_assert(is_definition()); return *(m_ptr->m_value); }
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unsigned declaration::get_weight() const { return m_ptr->m_weight; }
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module_idx declaration::get_module_idx() const { return m_ptr->m_module_idx; }
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bool declaration::use_conv_opt() const { return m_ptr->m_use_conv_opt; }
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declaration mk_definition(name const & n, level_param_names const & params, expr const & t, expr const & v,
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bool opaque, unsigned weight, module_idx mod_idx, bool use_conv_opt) {
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return declaration(new declaration::cell(n, params, t, false, v, opaque, weight, mod_idx, use_conv_opt));
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}
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declaration mk_definition(environment const & env, name const & n, level_param_names const & params, expr const & t, expr const & v,
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bool opaque, module_idx mod_idx, bool use_conv_opt) {
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unsigned w = 0;
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for_each(v, [&](expr const & e, unsigned) {
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if (is_constant(e)) {
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auto d = env.find(const_name(e));
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if (d && d->get_weight() > w)
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w = d->get_weight();
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}
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return true;
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});
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return mk_definition(n, params, t, v, opaque, w+1, mod_idx, use_conv_opt);
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}
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declaration mk_theorem(name const & n, level_param_names const & params, expr const & t, expr const & v, module_idx mod_idx) {
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return declaration(new declaration::cell(n, params, t, true, v, true, 0, mod_idx, false));
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}
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declaration mk_axiom(name const & n, level_param_names const & params, expr const & t) {
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return declaration(new declaration::cell(n, params, t, true));
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}
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declaration mk_constant_assumption(name const & n, level_param_names const & params, expr const & t) {
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return declaration(new declaration::cell(n, params, t, false));
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}
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void initialize_declaration() {
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g_dummy = new declaration(mk_axiom(name(), level_param_names(), expr()));
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}
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void finalize_declaration() {
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delete g_dummy;
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}
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}
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