0556412f8d
@kha The runtime folder includes what is needed to link a standalone Lean program. It is still contains some unnecessary files. We will be able to remove them after we release Lean4.
117 lines
4.9 KiB
C++
117 lines
4.9 KiB
C++
/*
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Copyright (c) 2016 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 <string>
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#include "runtime/sstream.h"
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#include "library/kernel_serializer.h"
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#include "frontends/lean/parser.h"
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#include "frontends/lean/tokens.h"
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#include "frontends/lean/structure_instance.h"
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namespace lean {
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static name * g_structure_instance_name = nullptr;
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static std::string * g_structure_instance_opcode = nullptr;
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[[ noreturn ]] static void throw_se_ex() { throw exception("unexpected occurrence of 'structure instance' expression"); }
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/*
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We encode a 'structure instance' expression using a macro.
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This is a trick to avoid creating a new kind of expression.
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'Structure instance' expressions are temporary objects used by the elaborator.
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Example: Given
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structure point (A B : Type) := (x : A) (y : B)
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the structure instance
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{ point . x := 10, y := 20 }
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is compiled into
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point.mk 10 20
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*/
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class structure_instance_macro_cell : public macro_definition_cell {
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name m_struct;
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bool m_catchall;
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list<name> m_fields;
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public:
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structure_instance_macro_cell(name const & s, bool ca, list<name> const & fs):
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m_struct(s), m_catchall(ca), m_fields(fs) {}
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virtual name get_name() const override { return *g_structure_instance_name; }
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virtual expr check_type(expr const &, abstract_type_context &, bool) const override { throw_se_ex(); }
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virtual optional<expr> expand(expr const &, abstract_type_context &) const override { throw_se_ex(); }
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virtual void write(serializer & s) const override {
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s << *g_structure_instance_opcode << m_struct << m_catchall;
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write_list(s, m_fields);
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}
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name const & get_struct() const { return m_struct; }
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bool get_catchall() const { return m_catchall; }
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list<name> const & get_field_names() const { return m_fields; }
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virtual bool operator==(macro_definition_cell const & other) const override {
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if (auto other_ptr = dynamic_cast<structure_instance_macro_cell const *>(&other)) {
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return m_struct == other_ptr->m_struct && m_catchall == other_ptr->m_catchall && m_fields == other_ptr->m_fields;
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} else {
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return false;
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}
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}
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};
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static expr mk_structure_instance_core(name const & s, bool ca, list<name> const & fs, unsigned num, expr const * args) {
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lean_assert(num >= length(fs));
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macro_definition def(new structure_instance_macro_cell(s, ca, fs));
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return mk_macro(def, num, args);
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}
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expr mk_structure_instance(name const & s, buffer<name> const & fns, buffer<expr> const & fvs,
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buffer<expr> const & sources, bool catchall) {
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lean_assert(fns.size() == fvs.size());
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buffer<expr> aux;
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aux.append(fvs);
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aux.append(sources);
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return mk_structure_instance_core(s, catchall, to_list(fns), aux.size(), aux.data());
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}
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expr mk_structure_instance(structure_instance_info const & info) {
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return mk_structure_instance(info.m_struct_name, info.m_field_names, info.m_field_values, info.m_sources,
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info.m_catchall);
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}
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bool is_structure_instance(expr const & e) {
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return is_macro(e) && macro_def(e).get_name() == *g_structure_instance_name;
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}
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structure_instance_info get_structure_instance_info(expr const & e) {
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lean_assert(is_structure_instance(e));
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structure_instance_info info;
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auto m = static_cast<structure_instance_macro_cell const*>(macro_def(e).raw());
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info.m_struct_name = m->get_struct();
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to_buffer(m->get_field_names(), info.m_field_names);
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unsigned num_fields = info.m_field_names.size();
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for (unsigned i = 0; i < num_fields; i++)
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info.m_field_values.push_back(macro_arg(e, i));
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for (unsigned i = num_fields; i < macro_num_args(e); i++)
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info.m_sources.push_back(macro_arg(e, i));
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info.m_catchall = m->get_catchall();
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return info;
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}
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void initialize_structure_instance() {
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g_structure_instance_name = new name("structure instance");
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g_structure_instance_opcode = new std::string("STI");
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register_macro_deserializer(*g_structure_instance_opcode,
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[](deserializer & d, unsigned num, expr const * args) {
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list<name> fns;
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name s;
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bool ca;
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d >> s >> ca;
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fns = read_list<name>(d);
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unsigned len = length(fns);
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if (num < len)
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throw corrupted_stream_exception();
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return mk_structure_instance_core(s, ca, fns, num, args);
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});
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}
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void finalize_structure_instance() {
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delete g_structure_instance_opcode;
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delete g_structure_instance_name;
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}
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}
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