416 lines
15 KiB
C++
416 lines
15 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: Gabriel Ebner
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*/
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#include <utility>
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#include <string>
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#include <vector>
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#include <algorithm>
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#include "util/utf8.h"
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#include "util/lean_path.h"
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#include "util/file_lock.h"
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#include "library/module_mgr.h"
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#include "library/module.h"
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#include "frontends/lean/pp.h"
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#include "frontends/lean/parser.h"
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#include "library/library_task_builder.h"
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namespace lean {
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void module_mgr::mark_out_of_date(module_id const & id) {
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for (auto & mod : m_modules) {
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if (!mod.second || mod.second->m_out_of_date) continue;
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for (auto & dep : mod.second->m_deps) {
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if (dep.m_id == id) {
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mod.second->m_out_of_date = true;
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mark_out_of_date(mod.first);
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break;
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}
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}
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}
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}
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static module_loader mk_loader(module_id const & cur_mod, std::vector<module_info::dependency> const & deps) {
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auto deps_per_mod_ptr = std::make_shared<std::unordered_map<module_id, std::vector<module_info::dependency>>>();
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auto & deps_per_mod = *deps_per_mod_ptr;
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buffer<module_info const *> to_process;
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for (auto & d : deps) {
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if (d.m_mod_info) {
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deps_per_mod[cur_mod].push_back(d);
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to_process.push_back(d.m_mod_info.get());
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}
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}
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while (!to_process.empty()) {
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module_info const & m = *to_process.back();
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to_process.pop_back();
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if (deps_per_mod.count(m.m_mod)) continue;
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for (auto & d : m.m_deps) {
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if (d.m_mod_info) {
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deps_per_mod[m.m_mod].push_back(d);
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if (!deps_per_mod.count(d.m_mod_info->m_mod))
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to_process.push_back(d.m_mod_info.get());
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}
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}
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}
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return[deps_per_mod_ptr] (std::string const & current_module, module_name const & import) -> std::shared_ptr<loaded_module const> {
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try {
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for (auto & d : deps_per_mod_ptr->at(current_module)) {
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if (d.m_import_name.m_name == import.m_name && d.m_import_name.m_relative == import.m_relative) {
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return get(d.m_mod_info->m_result).m_loaded_module;
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}
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}
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} catch (std::out_of_range) {
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// In files with syntax errors, it can happen that the
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// initial dependency scan does not find all dependencies.
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}
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throw exception(sstream() << "could not resolve import: " << import.m_name);
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};
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}
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static gtask compile_olean(std::shared_ptr<module_info const> const & mod, log_tree::node const & parsing_lt) {
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auto errs = has_errors(parsing_lt);
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gtask mod_dep = mk_deep_dependency(mod->m_result, [] (buffer<gtask> & deps, module_info::parse_result const & res) {
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for (auto & mdf : res.m_loaded_module->m_modifications)
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mdf->get_task_dependencies(deps);
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deps.push_back(res.m_loaded_module->m_uses_sorry);
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});
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std::vector<gtask> olean_deps;
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for (auto & dep : mod->m_deps)
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if (dep.m_mod_info)
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olean_deps.push_back(dep.m_mod_info->m_olean_task);
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return add_library_task(task_builder<unit>([mod, errs] {
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if (mod->m_source != module_src::LEAN)
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throw exception("cannot build olean from olean");
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auto res = get(mod->m_result);
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if (get(errs)) throw exception("not creating olean file because of errors");
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auto olean_fn = olean_of_lean(mod->m_mod);
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exclusive_file_lock output_lock(olean_fn);
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std::ofstream out(olean_fn, std::ios_base::binary);
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write_module(*res.m_loaded_module, out);
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return unit();
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}).depends_on(mod_dep).depends_on(olean_deps).depends_on(errs), std::string("saving olean"));
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}
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// TODO(gabriel): adapt to vfs
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static module_id resolve(search_path const & path,
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module_id const & module_file_name,
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module_name const & ref) {
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auto base_dir = dirname(module_file_name);
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try {
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return find_file(path, base_dir, ref.m_relative, ref.m_name, ".lean");
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} catch (lean_file_not_found_exception) {
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return olean_file_to_lean_file(find_file(path, base_dir, ref.m_relative, ref.m_name, ".olean"));
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}
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}
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void module_mgr::build_module(module_id const & id, bool can_use_olean, name_set module_stack) {
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if (auto & existing_mod = m_modules[id])
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if (!existing_mod->m_out_of_date) return;
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scope_global_ios scope_ios(m_ios);
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scope_log_tree lt(m_lt.mk_child(id, {}, { id, {{1, 0}, {static_cast<unsigned>(-1), 0}} }, log_tree::DefaultLevel, true));
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scope_traces_as_messages scope_trace_msgs(id, {1, 0});
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try {
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auto orig_module_stack = module_stack;
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if (module_stack.contains(id)) {
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throw exception(sstream() << "cyclic import: " << id);
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}
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module_stack.insert(id);
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bool already_have_lean_version = m_modules[id] && m_modules[id]->m_source == module_src::LEAN;
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std::string contents;
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module_src src;
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time_t mtime;
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std::tie(contents, src, mtime) = m_vfs->load_module(id, !already_have_lean_version && can_use_olean);
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if (src == module_src::OLEAN) {
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auto obj_code = contents;
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std::istringstream in2(obj_code, std::ios_base::binary);
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auto olean_fn = olean_of_lean(id);
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bool check_hash = false;
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auto parsed_olean = parse_olean(in2, olean_fn, check_hash);
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auto mod = std::make_shared<module_info>();
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mod->m_mod = id;
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mod->m_lt = lt.get();
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mod->m_source = module_src::OLEAN;
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mod->m_trans_mtime = mod->m_mtime = mtime;
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for (auto & d : parsed_olean.m_imports) {
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auto d_id = resolve(m_path, id, d);
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build_module(d_id, true, module_stack);
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auto & d_mod = m_modules[d_id];
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mod->m_deps.push_back({ d_id, d, d_mod });
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mod->m_trans_mtime = std::max(mod->m_trans_mtime, d_mod->m_trans_mtime);
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}
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if (mod->m_trans_mtime > mod->m_mtime)
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return build_module(id, false, orig_module_stack);
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module_info::parse_result res;
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auto deps = mod->m_deps;
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res.m_loaded_module = cache_preimported_env(
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{ id, parsed_olean.m_imports,
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parse_olean_modifications(parsed_olean.m_serialized_modifications, id),
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mk_pure_task<bool>(parsed_olean.m_uses_sorry), {} },
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m_initial_env, [=] { return mk_loader(id, deps); });
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mod->m_result = mk_pure_task<module_info::parse_result>(res);
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if (auto & old_mod = m_modules[id])
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cancel(old_mod->m_cancel);
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m_modules[id] = mod;
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} else if (src == module_src::LEAN) {
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auto mod = build_lean(id, contents, mtime, module_stack);
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m_modules[id] = mod;
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} else {
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throw exception("unknown module source");
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}
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} catch (throwable & ex) {
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message_builder msg(m_initial_env, m_ios, id, pos_info {1, 0}, ERROR);
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msg.set_exception(ex);
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msg.report();
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throw ex;
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}
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}
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std::shared_ptr<module_info>
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module_mgr::build_lean(module_id const & id, std::string const & contents, time_t mtime, name_set const & module_stack) {
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auto & lt = logtree();
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auto end_pos = find_end_pos(contents);
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scope_log_tree lt2(lt.mk_child({}, {}, { id, {{1, 0}, end_pos} }));
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auto imports = get_direct_imports(id, contents);
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auto mod = std::make_shared<module_info>();
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mod->m_lt = logtree();
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mod->m_mod = id;
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mod->m_source = module_src::LEAN;
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mod->m_trans_mtime = mod->m_mtime = mtime;
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mod->m_lean_contents = contents;
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for (auto & d : imports) {
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module_id d_id;
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std::shared_ptr<module_info const> d_mod;
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try {
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d_id = resolve(m_path, id, d);
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build_module(d_id, true, module_stack);
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d_mod = m_modules[d_id];
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mod->m_trans_mtime = std::max(mod->m_trans_mtime, d_mod->m_trans_mtime);
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} catch (throwable & ex) {
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message_builder(m_initial_env, m_ios, id, {1, 0}, ERROR).set_exception(ex).report();
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}
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mod->m_deps.push_back({ d_id, d, d_mod });
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}
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std::vector<gtask> deps;
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for (auto & d : mod->m_deps)
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if (d.m_mod_info)
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deps.push_back(d.m_mod_info->m_result);
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if (!mod->m_deps.empty()) {
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// also add the preimported environment of the first dependency
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if (auto & mod_info = mod->m_deps.front().m_mod_info) {
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deps.push_back(mk_deep_dependency(mod_info->m_result,
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[] (buffer<gtask> & ds, module_info::parse_result const & res) {
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ds.push_back(res.m_loaded_module->m_env);
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}));
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}
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}
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auto ldr = mk_loader(id, mod->m_deps);
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auto mod_parser_fn = std::make_shared<module_parser>(id, contents, m_initial_env, ldr);
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mod_parser_fn->save_info(m_use_snapshots);
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module_parser_result snapshots;
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std::tie(mod->m_cancel, snapshots) = build_lean_snapshots(
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mod_parser_fn, m_modules[id], deps, contents);
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scope_cancellation_token scope_cancel(mod->m_cancel);
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if (m_use_snapshots) {
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// Even just keeping a reference to the final environment costs us
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// a few hundred megabytes (when compiling the standard library).
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mod->m_snapshots = snapshots;
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}
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auto initial_env = m_initial_env;
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mod->m_result = map<module_info::parse_result>(
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get_end(snapshots),
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[=](module_parser_result const & res) {
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module_info::parse_result parse_res;
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lean_always_assert(res.m_snapshot_at_end);
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parse_res.m_loaded_module = cache_preimported_env(
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export_module(res.m_snapshot_at_end->m_env, id),
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initial_env, [=] { return ldr; });
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parse_res.m_opts = res.m_snapshot_at_end->m_options;
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return parse_res;
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}).build();
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if (m_save_olean) {
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scope_log_tree_core lt3(<);
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mod->m_olean_task = compile_olean(mod, lt2.get());
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}
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return mod;
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}
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static optional<pos_info> get_first_diff_pos(std::string const & as, std::string const & bs) {
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char const * a = as.c_str(), * b = bs.c_str();
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int line = 1;
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while (true) {
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char const * ai = strchr(a, '\n');
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char const * bi = strchr(b, '\n');
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if (ai && bi) {
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if (ai - a == bi - b &&
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ai[1] && bi[1] && // ignore final newlines, the scanner does not see them
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strncmp(a, b, ai - a) == 0) {
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a = ai + 1;
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b = bi + 1;
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line++;
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} else {
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break;
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}
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} else if (strcmp(a, b) == 0) {
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return optional<pos_info>();
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} else {
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break;
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}
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}
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return optional<pos_info>(line, 0);
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}
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std::pair<cancellation_token, module_parser_result>
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module_mgr::build_lean_snapshots(std::shared_ptr<module_parser> const & mod_parser,
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std::shared_ptr<module_info> const & old_mod,
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std::vector<gtask> const & deps, std::string const & contents) {
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auto rebuild = [&] {
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if (old_mod) cancel(old_mod->m_cancel);
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auto cancel_tok = mk_cancellation_token();
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return std::make_pair(cancel_tok, mod_parser->parse(optional<std::vector<gtask>>(deps)));
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};
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if (!m_use_snapshots) return rebuild();
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if (!old_mod) return rebuild();
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if (old_mod->m_source != module_src::LEAN)
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return rebuild();
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for (auto d : old_mod->m_deps) {
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if (!d.m_mod_info && !m_modules[d.m_id]) continue;
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if (d.m_mod_info && m_modules[d.m_id] && m_modules[d.m_id] == d.m_mod_info) continue;
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return rebuild();
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}
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if (!old_mod->m_lean_contents || !old_mod->m_snapshots) return rebuild();
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auto snap = *old_mod->m_snapshots;
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logtree().reuse("_next"); // TODO(gabriel): this needs to be the same name as in module_parser...
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if (auto diff_pos = get_first_diff_pos(contents, *old_mod->m_lean_contents)) {
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return std::make_pair(old_mod->m_cancel,
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mod_parser->resume_from_start(snap, *diff_pos, optional<std::vector<gtask>>(deps)));
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} else {
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// no diff
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return std::make_pair(old_mod->m_cancel, snap);
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}
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}
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std::shared_ptr<module_info const> module_mgr::get_module(module_id const & id) {
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unique_lock<mutex> lock(m_mutex);
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name_set module_stack;
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build_module(id, true, module_stack);
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return m_modules.at(id);
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}
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void module_mgr::invalidate(module_id const & id) {
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unique_lock<mutex> lock(m_mutex);
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if (auto & mod = m_modules[id])
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mod->m_out_of_date = true;
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mark_out_of_date(id);
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buffer<module_id> to_rebuild;
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to_rebuild.push_back(id);
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for (auto & mod : m_modules) {
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if (mod.second && mod.second->m_out_of_date)
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to_rebuild.push_back(mod.first);
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}
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for (auto & i : to_rebuild) {
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try {
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build_module(i, true, {});
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} catch (...) {}
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}
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}
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std::vector<module_name> module_mgr::get_direct_imports(module_id const & id, std::string const & contents) {
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std::vector<module_name> imports;
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try {
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scope_log_tree lt;
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std::istringstream in(contents);
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bool use_exceptions = true;
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parser p(get_initial_env(), m_ios, nullptr, in, id, use_exceptions);
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p.get_imports(imports);
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} catch (...) {}
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return imports;
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}
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void module_mgr::cancel_all() {
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for (auto & m : m_modules) {
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if (auto mod = m.second) {
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cancel(mod->m_cancel);
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}
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}
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}
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std::tuple<std::string, module_src, time_t> fs_module_vfs::load_module(module_id const & id, bool can_use_olean) {
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auto lean_fn = id;
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auto lean_mtime = get_mtime(lean_fn);
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try {
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auto olean_fn = olean_of_lean(lean_fn);
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shared_file_lock olean_lock(olean_fn);
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auto olean_mtime = get_mtime(olean_fn);
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if (olean_mtime != -1 && olean_mtime >= lean_mtime &&
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can_use_olean &&
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!m_modules_to_load_from_source.count(id)) {
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return std::make_tuple(read_file(olean_fn, std::ios_base::binary), module_src::OLEAN, olean_mtime);
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}
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} catch (exception) {}
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return std::make_tuple(read_file(lean_fn), module_src::LEAN, lean_mtime);
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}
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environment get_combined_environment(environment const & env,
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buffer<std::shared_ptr<module_info const>> const & mods) {
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module_id combined_id = "<combined_environment.lean>";
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std::vector<module_info::dependency> deps;
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std::vector<module_name> refs;
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for (auto & mod : mods) {
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// TODO(gabriel): switch module_ids to names, then we don't need this hack
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module_name ref { name(mod->m_mod), {} };
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deps.push_back({ mod->m_mod, ref, mod });
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refs.push_back(ref);
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}
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return import_modules(env, combined_id, refs, mk_loader(combined_id, deps));
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}
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}
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