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- #include "type_env.hpp"
- #include "type.hpp"
- #include "error.hpp"
- #include <cassert>
-
- void type_env::find_free(const type_mgr& mgr, std::set<std::string>& into) const {
- if(parent != nullptr) parent->find_free(mgr, into);
- for(auto& binding : names) {
- mgr.find_free(binding.second.type, into);
- }
- }
-
- void type_env::find_free_except(const type_mgr& mgr, const group& avoid,
- std::set<std::string>& into) const {
- if(parent != nullptr) parent->find_free(mgr, into);
- for(auto& binding : names) {
- if(avoid.members.find(binding.first) != avoid.members.end()) continue;
- mgr.find_free(binding.second.type, into);
- }
- }
-
- type_scheme_ptr type_env::lookup(const std::string& name) const {
- auto it = names.find(name);
- if(it != names.end()) return it->second.type;
- if(parent) return parent->lookup(name);
- return nullptr;
- }
-
- bool type_env::is_global(const std::string& name) const {
- auto it = names.find(name);
- if(it != names.end()) return it->second.vis == visibility::global;
- if(parent) return parent->is_global(name);
- return false;
- }
-
- void type_env::set_mangled_name(const std::string& name, const std::string& mangled) {
- auto it = names.find(name);
-
- // Can't set mangled name for non-existent variable.
- assert(it != names.end());
- // Local names shouldn't need mangling.
- assert(it->second.vis == visibility::global);
-
- it->second.mangled_name = mangled;
- }
-
- const std::string& type_env::get_mangled_name(const std::string& name) const {
- auto it = names.find(name);
- if(it != names.end()) {
- assert(it->second.mangled_name);
- return *it->second.mangled_name;
- }
- assert(parent != nullptr);
- return parent->get_mangled_name(name);
- }
-
- type_ptr type_env::lookup_type(const std::string& name) const {
- auto it = type_names.find(name);
- if(it != type_names.end()) return it->second;
- if(parent) return parent->lookup_type(name);
- return nullptr;
- }
-
- void type_env::bind(const std::string& name, type_ptr t, visibility v) {
- type_scheme_ptr new_scheme(new type_scheme(std::move(t)));
- names[name] = variable_data(std::move(new_scheme), v, std::nullopt);
- }
-
- void type_env::bind(const std::string& name, type_scheme_ptr t, visibility v) {
- names[name] = variable_data(std::move(t), v, "");
- }
-
- void type_env::bind_type(const std::string& type_name, type_ptr t) {
- if(lookup_type(type_name) != nullptr)
- throw type_error("redefinition of type");
- type_names[type_name] = t;
- }
-
- void type_env::generalize(const std::string& name, const group& grp, type_mgr& mgr) {
- auto names_it = names.find(name);
- assert(names_it != names.end());
- assert(names_it->second.type->forall.size() == 0);
-
- std::set<std::string> free_in_type;
- std::set<std::string> free_in_env;
- mgr.find_free(names_it->second.type->monotype, free_in_type);
- find_free_except(mgr, grp, free_in_env);
- for(auto& free : free_in_type) {
- if(free_in_env.find(free) != free_in_env.end()) continue;
- names_it->second.type->forall.push_back(free);
- }
- }
-
- type_env_ptr type_scope(type_env_ptr parent) {
- return type_env_ptr(new type_env(std::move(parent)));
- }
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