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