lean2/src/library/reducible.cpp

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/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include <string>
#include "util/sstream.h"
#include "kernel/environment.h"
#include "kernel/type_checker.h"
#include "library/kernel_serializer.h"
#include "library/scoped_ext.h"
#include "library/reducible.h"
namespace lean {
struct reducible_entry {
reducible_status m_status;
name m_name;
reducible_entry():m_status(reducible_status::None) {}
reducible_entry(reducible_status s, name const & n):m_status(s), m_name(n) {}
};
struct reducible_state {
name_set m_reducible_on;
name_set m_reducible_off;
void add(reducible_entry const & e) {
switch (e.m_status) {
case reducible_status::On:
m_reducible_on.insert(e.m_name);
m_reducible_off.erase(e.m_name);
break;
case reducible_status::Off:
m_reducible_on.erase(e.m_name);
m_reducible_off.insert(e.m_name);
break;
case reducible_status::None:
m_reducible_on.erase(e.m_name);
m_reducible_off.erase(e.m_name);
break;
}
}
};
static name * g_class_name = nullptr;
static std::string * g_key = nullptr;
struct reducible_config {
typedef reducible_state state;
typedef reducible_entry entry;
static void add_entry(environment const &, io_state const &, state & s, entry const & e) {
s.add(e);
}
static name const & get_class_name() {
return *g_class_name;
}
static std::string const & get_serialization_key() {
return *g_key;
}
static void write_entry(serializer & s, entry const & e) {
s << static_cast<char>(e.m_status) << e.m_name;
}
static entry read_entry(deserializer & d) {
entry e; char s;
d >> s >> e.m_name;
e.m_status = static_cast<reducible_status>(s);
return e;
}
static optional<unsigned> get_fingerprint(entry const & e) {
return some(hash(static_cast<unsigned>(e.m_status), e.m_name.hash()));
}
};
template class scoped_ext<reducible_config>;
typedef scoped_ext<reducible_config> reducible_ext;
static name * g_tmp_prefix = nullptr;
void initialize_reducible() {
g_class_name = new name("reducible");
g_key = new std::string("redu");
g_tmp_prefix = new name(name::mk_internal_unique_name());
reducible_ext::initialize();
}
void finalize_reducible() {
reducible_ext::finalize();
delete g_tmp_prefix;
delete g_key;
delete g_class_name;
}
static void check_declaration(environment const & env, name const & n) {
declaration const & d = env.get(n);
if (!d.is_definition())
throw exception(sstream() << "invalid reducible command, '" << n << "' is not a definition");
if (d.is_theorem())
throw exception(sstream() << "invalid reducible command, '" << n << "' is a theorem");
if (d.is_opaque() && d.get_module_idx() != g_main_module_idx)
throw exception(sstream() << "invalid reducible command, '" << n << "' is an opaque definition");
}
environment set_reducible(environment const & env, name const & n, reducible_status s, bool persistent) {
check_declaration(env, n);
return reducible_ext::add_entry(env, get_dummy_ios(), reducible_entry(s, n), persistent);
}
bool is_reducible_on(environment const & env, name const & n) {
reducible_state const & s = reducible_ext::get_state(env);
return s.m_reducible_on.contains(n);
}
bool is_reducible_off(environment const & env, name const & n) {
reducible_state const & s = reducible_ext::get_state(env);
return s.m_reducible_off.contains(n);
}
std::unique_ptr<type_checker> mk_type_checker(environment const & env, name_generator const & ngen,
bool relax_main_opaque, bool only_main_reducible,
bool memoize) {
reducible_state const & s = reducible_ext::get_state(env);
if (only_main_reducible) {
name_set reducible_on = s.m_reducible_on;
name_set reducible_off = s.m_reducible_off;
extra_opaque_pred pred([=](name const & n) {
return
(!module::is_definition(env, n) || reducible_off.contains(n)) &&
(!reducible_on.contains(n));
});
return std::unique_ptr<type_checker>(new type_checker(env, ngen, mk_default_converter(env, relax_main_opaque,
memoize, pred)));
} else {
name_set reducible_off = s.m_reducible_off;
extra_opaque_pred pred([=](name const & n) { return reducible_off.contains(n); });
return std::unique_ptr<type_checker>(new type_checker(env, ngen, mk_default_converter(env, relax_main_opaque,
memoize, pred)));
}
}
std::unique_ptr<type_checker> mk_type_checker(environment const & env, bool relax_main_opaque, bool only_main_reducible) {
return mk_type_checker(env, name_generator(*g_tmp_prefix), relax_main_opaque, only_main_reducible);
}
}