refactor(kernel/converter): replace extra_opaque_set with predicate
It gives us more flexibility.
This commit is contained in:
Leonardo de Moura
parent
1fbb554a16
commit
ea1bae0143
8 changed files with 97 additions and 56 deletions
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@ -23,31 +23,36 @@ namespace lean {
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We also believe it increases the modularity of Lean developments by minimizing the dependency on how things are defined.
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We should view non-opaque definitions as "inline definitions" used in programming languages such as C++.
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2) Whenever type checking an expression, the user can provide an additional set of definition names (m_extra_opaque) that
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should be considered opaque. Note that, if \c t type checks when using an extra_opaque set S, then t also type checks
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(modulo resource constraints) with the empty set. Again, the purpose of extra_opaque is to mimimize the number
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2) Whenever type checking an expression, the user can provide a predicate that is true for for additional definitions that
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should be considered opaque. Note that, if \c t type checks when using predicate P, then t also type checks
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(modulo resource constraints) without it. Again, the purpose of the predicate is to mimimize the number
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of delta-reduction steps.
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3) To be able to prove theorems about an opaque definition, we treat an opaque definition D in a module M as
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transparent when we are type checking another definition/theorem D' also in M. This rule only applies if
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D is not a theorem, nor D is in the set m_extra_opaque. To implement this feature, this class has a field
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D is not a theorem, nor pred(D) is true. To implement this feature, this class has a field
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m_module_idx that is not none when this rule should be applied.
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*/
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bool is_opaque(declaration const & d, name_set const & extra_opaque, optional<module_idx> const & mod_idx) {
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bool is_opaque(declaration const & d, extra_opaque_pred const & pred, optional<module_idx> const & mod_idx) {
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lean_assert(d.is_definition());
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if (d.is_theorem()) return true; // theorems are always opaque
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if (extra_opaque.contains(d.get_name())) return true; // extra_opaque set overrides opaque flag
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if (pred(d.get_name())) return true; // extra_opaque predicate overrides opaque flag
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if (!d.is_opaque()) return false; // d is a transparent definition
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if (mod_idx && d.get_module_idx() == *mod_idx) return false; // the opaque definitions in mod_idx are considered transparent
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return true; // d is opaque
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}
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extra_opaque_pred g_always_false([](name const &) { return false; });
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extra_opaque_pred const & no_extra_opaque() {
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return g_always_false;
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}
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/** \brief Auxiliary method for \c is_delta */
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static optional<declaration> is_delta_core(environment const & env, expr const & e, name_set const & extra_opaque,
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static optional<declaration> is_delta_core(environment const & env, expr const & e, extra_opaque_pred const & pred,
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optional<module_idx> const & mod_idx) {
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if (is_constant(e)) {
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if (auto d = env.find(const_name(e)))
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if (d->is_definition() && !is_opaque(*d, extra_opaque, mod_idx))
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if (d->is_definition() && !is_opaque(*d, pred, mod_idx))
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return d;
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}
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return none_declaration();
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@ -57,15 +62,21 @@ static optional<declaration> is_delta_core(environment const & env, expr const &
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\brief Return some definition \c d iff \c e is a target for delta-reduction, and the given definition is the one
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to be expanded.
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*/
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optional<declaration> is_delta(environment const & env, expr const & e, name_set const & extra_opaque, optional<module_idx> const & mod_idx) {
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return is_delta_core(env, get_app_fn(e), extra_opaque, mod_idx);
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optional<declaration> is_delta(environment const & env, expr const & e,
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extra_opaque_pred const & pred, optional<module_idx> const & mod_idx) {
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return is_delta_core(env, get_app_fn(e), pred, mod_idx);
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}
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static optional<module_idx> g_opt_main_module_idx(g_main_module_idx);
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optional<declaration> is_delta(environment const & env, expr const & e, name_set const & extra_opaque) {
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return is_delta(env, e, extra_opaque, g_opt_main_module_idx);
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optional<declaration> is_delta(environment const & env, expr const & e, extra_opaque_pred const & pred) {
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return is_delta(env, e, pred, g_opt_main_module_idx);
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}
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optional<declaration> is_delta(environment const & env, expr const & e) {
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return is_delta(env, e, g_always_false);
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}
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static no_delayed_justification g_no_delayed_jst;
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pair<bool, constraint_seq> converter::is_def_eq(expr const & t, expr const & s, type_checker & c) {
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return is_def_eq(t, s, c, g_no_delayed_jst);
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@ -95,12 +106,13 @@ struct default_converter : public converter {
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environment m_env;
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optional<module_idx> m_module_idx;
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bool m_memoize;
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name_set m_extra_opaque;
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extra_opaque_pred m_extra_pred;
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expr_struct_map<expr> m_whnf_core_cache;
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expr_struct_map<pair<expr, constraint_seq>> m_whnf_cache;
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default_converter(environment const & env, optional<module_idx> mod_idx, bool memoize, name_set const & extra_opaque):
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m_env(env), m_module_idx(mod_idx), m_memoize(memoize), m_extra_opaque(extra_opaque) {
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default_converter(environment const & env, optional<module_idx> mod_idx, bool memoize,
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extra_opaque_pred const & pred):
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m_env(env), m_module_idx(mod_idx), m_memoize(memoize), m_extra_pred(pred) {
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}
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constraint mk_eq_cnstr(expr const & lhs, expr const & rhs, justification const & j) {
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@ -211,7 +223,7 @@ struct default_converter : public converter {
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}
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bool is_opaque(declaration const & d) const {
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return ::lean::is_opaque(d, m_extra_opaque, m_module_idx);
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return ::lean::is_opaque(d, m_extra_pred, m_module_idx);
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}
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/** \brief Expand \c e if it is non-opaque constant with weight >= w */
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@ -252,7 +264,7 @@ struct default_converter : public converter {
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to be expanded.
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*/
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optional<declaration> is_delta(expr const & e) {
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return ::lean::is_delta(m_env, get_app_fn(e), m_extra_opaque, m_module_idx);
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return ::lean::is_delta(m_env, get_app_fn(e), m_extra_pred, m_module_idx);
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}
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/**
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@ -632,14 +644,21 @@ struct default_converter : public converter {
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};
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std::unique_ptr<converter> mk_default_converter(environment const & env, optional<module_idx> mod_idx,
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bool memoize, name_set const & extra_opaque) {
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return std::unique_ptr<converter>(new default_converter(env, mod_idx, memoize, extra_opaque));
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bool memoize, extra_opaque_pred const & pred) {
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return std::unique_ptr<converter>(new default_converter(env, mod_idx, memoize, pred));
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}
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std::unique_ptr<converter> mk_default_converter(environment const & env, optional<module_idx> mod_idx,
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bool memoize) {
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return mk_default_converter(env, mod_idx, memoize, g_always_false);
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}
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std::unique_ptr<converter> mk_default_converter(environment const & env, bool unfold_opaque_main, bool memoize,
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name_set const & extra_opaque) {
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extra_opaque_pred const & pred) {
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if (unfold_opaque_main)
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return mk_default_converter(env, optional<module_idx>(0), memoize, extra_opaque);
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return mk_default_converter(env, optional<module_idx>(0), memoize, pred);
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else
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return mk_default_converter(env, optional<module_idx>(), memoize, extra_opaque);
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return mk_default_converter(env, optional<module_idx>(), memoize, pred);
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}
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std::unique_ptr<converter> mk_default_converter(environment const & env, bool unfold_opaque_main, bool memoize) {
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return mk_default_converter(env, unfold_opaque_main, memoize, g_always_false);
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}
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}
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@ -5,6 +5,7 @@ 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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#pragma once
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#include <functional>
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#include "kernel/environment.h"
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namespace lean {
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@ -24,13 +25,17 @@ public:
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};
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std::unique_ptr<converter> mk_dummy_converter();
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std::unique_ptr<converter> mk_default_converter(environment const & env,
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optional<module_idx> mod_idx = optional<module_idx>(),
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bool memoize = true, name_set const & extra_opaque = name_set());
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std::unique_ptr<converter> mk_default_converter(environment const & env, optional<module_idx> mod_idx = optional<module_idx>(),
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bool memoize = true);
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std::unique_ptr<converter> mk_default_converter(environment const & env, optional<module_idx> mod_idx,
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bool memoize, extra_opaque_pred const & pred);
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std::unique_ptr<converter> mk_default_converter(environment const & env, bool unfold_opaque_main,
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bool memoize = true, name_set const & extra_opaque = name_set());
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bool memoize = true);
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std::unique_ptr<converter> mk_default_converter(environment const & env, bool unfold_opaque_main,
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bool memoize, extra_opaque_pred const & pred);
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bool is_opaque(declaration const & d, name_set const & extra_opaque, optional<module_idx> const & mod_idx);
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optional<declaration> is_delta(environment const & env, expr const & e, name_set const & extra_opaque, optional<module_idx> const & mod_idx);
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optional<declaration> is_delta(environment const & env, expr const & e, name_set const & extra_opaque = name_set());
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bool is_opaque(declaration const & d, extra_opaque_pred const & pred, optional<module_idx> const & mod_idx);
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optional<declaration> is_delta(environment const & env, expr const & e, extra_opaque_pred const & pred, optional<module_idx> const & mod_idx);
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optional<declaration> is_delta(environment const & env, expr const & e, extra_opaque_pred const & pred);
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optional<declaration> is_delta(environment const & env, expr const & e);
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}
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@ -29,6 +29,9 @@ class type_checker;
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class environment;
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class certified_declaration;
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typedef std::function<bool(name const &)> extra_opaque_pred;
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extra_opaque_pred const & no_extra_opaque();
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/**
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\brief The header of an environment is created when we create the empty environment.
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Moreover if environment B is an extension of environment A, then A and B share the same header.
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@ -223,7 +226,8 @@ class name_generator;
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Only the type_checker class can create certified declarations.
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*/
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class certified_declaration {
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friend certified_declaration check(environment const & env, declaration const & d, name_generator const & g, name_set const & extra_opaque, bool memoize);
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friend certified_declaration check(environment const & env, declaration const & d,
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name_generator const & g, extra_opaque_pred const & extra_opaque);
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environment_id m_id;
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declaration m_declaration;
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certified_declaration(environment_id const & id, declaration const & d):m_id(id), m_declaration(d) {}
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@ -453,20 +453,22 @@ static void check_duplicated_params(environment const & env, declaration const &
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}
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}
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certified_declaration check(environment const & env, declaration const & d, name_generator const & g, name_set const & extra_opaque, bool memoize) {
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certified_declaration check(environment const & env, declaration const & d, name_generator const & g,
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extra_opaque_pred const & pred) {
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if (d.is_definition())
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check_no_mlocal(env, d.get_name(), d.get_value(), false);
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check_no_mlocal(env, d.get_name(), d.get_type(), true);
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check_name(env, d.get_name());
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check_duplicated_params(env, d);
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type_checker checker1(env, g, mk_default_converter(env, optional<module_idx>(), memoize, extra_opaque));
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bool memoize = true;
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type_checker checker1(env, g, mk_default_converter(env, optional<module_idx>(), memoize, pred));
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expr sort = checker1.check(d.get_type(), d.get_univ_params()).first;
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checker1.ensure_sort(sort, d.get_type());
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if (d.is_definition()) {
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optional<module_idx> midx;
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if (d.is_opaque())
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midx = optional<module_idx>(d.get_module_idx());
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type_checker checker2(env, g, mk_default_converter(env, midx, memoize, extra_opaque));
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type_checker checker2(env, g, mk_default_converter(env, midx, memoize, pred));
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expr val_type = checker2.check(d.get_value(), d.get_univ_params()).first;
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if (!checker2.is_def_eq(val_type, d.get_type()).first) {
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throw_kernel_exception(env, d.get_value(), [=](formatter const & fmt) {
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@ -477,7 +479,15 @@ certified_declaration check(environment const & env, declaration const & d, name
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return certified_declaration(env.get_id(), d);
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}
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certified_declaration check(environment const & env, declaration const & d, name_set const & extra_opaque, bool memoize) {
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return check(env, d, name_generator(g_tmp_prefix), extra_opaque, memoize);
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certified_declaration check(environment const & env, declaration const & d, name_generator const & g) {
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return check(env, d, g, no_extra_opaque());
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}
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certified_declaration check(environment const & env, declaration const & d, extra_opaque_pred const & pred) {
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return check(env, d, name_generator(g_tmp_prefix), pred);
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}
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certified_declaration check(environment const & env, declaration const & d) {
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return check(env, d, no_extra_opaque());
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}
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}
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@ -209,9 +209,11 @@ void check_no_metavar(environment const & env, name const & n, expr const & e, b
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\brief Type check the given declaration, and return a certified declaration if it is type correct.
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Throw an exception if the declaration is type incorrect.
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*/
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certified_declaration check(environment const & env, declaration const & d,
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name_generator const & g, name_set const & extra_opaque = name_set(), bool memoize = true);
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certified_declaration check(environment const & env, declaration const & d, name_set const & extra_opaque = name_set(), bool memoize = true);
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certified_declaration check(environment const & env, declaration const & d, name_generator const & g,
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extra_opaque_pred const & pred);
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certified_declaration check(environment const & env, declaration const & d, name_generator const & g);
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certified_declaration check(environment const & env, declaration const & d, extra_opaque_pred const & pred);
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certified_declaration check(environment const & env, declaration const & d);
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/**
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\brief Create a justification for an application \c e where the expected type must be \c d_type and
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@ -1842,9 +1842,10 @@ static int mk_type_checker(lua_State * L) {
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return push_type_checker_ref(L, std::make_shared<type_checker>(to_environment(L, 1), to_name_generator(L, 2)));
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} else {
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optional<module_idx> mod_idx; bool memoize; name_set extra_opaque;
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extra_opaque_pred pred([=](name const & n) { return extra_opaque.contains(n); });
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get_type_checker_args(L, 3, mod_idx, memoize, extra_opaque);
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auto t = std::make_shared<type_checker>(to_environment(L, 1), to_name_generator(L, 2),
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mk_default_converter(to_environment(L, 1), mod_idx, memoize, extra_opaque),
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mk_default_converter(to_environment(L, 1), mod_idx, memoize, pred),
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memoize);
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return push_type_checker_ref(L, t);
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}
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@ -1905,28 +1906,29 @@ static const struct luaL_Reg type_checker_ref_m[] = {
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// type_check procedure
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static int type_check(lua_State * L) {
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int nargs = lua_gettop(L);
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if (nargs == 2)
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if (nargs == 2) {
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return push_certified_declaration(L, check(to_environment(L, 1), to_declaration(L, 2)));
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else if (nargs == 3)
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} else if (nargs == 3) {
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return push_certified_declaration(L, check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3)));
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else if (nargs == 4)
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return push_certified_declaration(L, check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3), to_name_set(L, 4)));
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else
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return push_certified_declaration(L, check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3), to_name_set(L, 4),
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lua_toboolean(L, 5)));
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} else {
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name_set extra_opaque = to_name_set(L, 4);
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extra_opaque_pred pred([=](name const & n) { return extra_opaque.contains(n); });
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return push_certified_declaration(L, check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3), pred));
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}
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}
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static int add_declaration(lua_State * L) {
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int nargs = lua_gettop(L);
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optional<certified_declaration> d;
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if (nargs == 2)
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if (nargs == 2) {
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d = check(to_environment(L, 1), to_declaration(L, 2));
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else if (nargs == 3)
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} else if (nargs == 3) {
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d = check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3));
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else if (nargs == 4)
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d = check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3), to_name_set(L, 4));
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else
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d = check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3), to_name_set(L, 4), lua_toboolean(L, 5));
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} else {
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name_set extra_opaque = to_name_set(L, 4);
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extra_opaque_pred pred([=](name const & n) { return extra_opaque.contains(n); });
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d = check(to_environment(L, 1), to_declaration(L, 2), to_name_generator(L, 3), pred);
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}
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return push_environment(L, module::add(to_environment(L, 1), *d));
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}
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@ -56,8 +56,10 @@ bool get_hide_main_opaque(environment const & env) {
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std::unique_ptr<type_checker> mk_type_checker_with_hints(environment const & env, name_generator const & ngen,
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bool relax_main_opaque) {
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auto const & ext = get_extension(env);
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name_set extra_opaque = ext.m_extra_opaque;
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extra_opaque_pred pred([=](name const & n) { return extra_opaque.contains(n); });
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return std::unique_ptr<type_checker>(new type_checker(env, ngen, mk_default_converter(env,
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!ext.m_hide_module && relax_main_opaque,
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true, ext.m_extra_opaque)));
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true, pred)));
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}
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}
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@ -106,9 +106,6 @@ static void tst2() {
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lean_assert(checker.is_def_eq(f98(c1, id(Prop, id(Prop, c2))), f97(f97(c1, id(Prop, c2)), f97(c2, c1))).first);
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name_set s;
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s.insert(name(base, 96));
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type_checker checker2(env, name_generator("tmp"), mk_default_converter(env, optional<module_idx>(), true, s));
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lean_assert_eq(checker2.whnf(f98(c1, c2)).first,
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f96(f96(f97(c1, c2), f97(c2, c1)), f96(f97(c2, c1), f97(c1, c2))));
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}
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class normalizer_extension_tst : public normalizer_extension {
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|
|
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Loading…
Reference in a new issue