438 lines
14 KiB
C++
438 lines
14 KiB
C++
#include "ast.hpp"
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#include <ostream>
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#include "binop.hpp"
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#include "error.hpp"
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#include "type_env.hpp"
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#include "env.hpp"
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static void print_indent(int n, std::ostream& to) {
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while(n--) to << " ";
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}
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void ast_int::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "INT: " << value << std::endl;
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}
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void ast_int::find_free(std::set<std::string>& into) {
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}
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type_ptr ast_int::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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return type_ptr(new type_app(env->lookup_type("Int")));
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}
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void ast_int::translate(global_scope& scope) {
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}
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void ast_int::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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into.push_back(instruction_ptr(new instruction_pushint(value)));
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}
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void ast_lid::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "LID: " << id << std::endl;
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}
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void ast_lid::find_free(std::set<std::string>& into) {
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into.insert(id);
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}
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type_ptr ast_lid::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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return env->lookup(id)->instantiate(mgr);
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}
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void ast_lid::translate(global_scope& scope) {
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}
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void ast_lid::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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auto mangled_name = this->env->get_mangled_name(id);
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into.push_back(instruction_ptr(
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(env->has_variable(mangled_name) && !this->env->is_global(id)) ?
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(instruction*) new instruction_push(env->get_offset(mangled_name)) :
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(instruction*) new instruction_pushglobal(mangled_name)));
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}
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void ast_uid::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "UID: " << id << std::endl;
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}
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void ast_uid::find_free(std::set<std::string>& into) {
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}
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type_ptr ast_uid::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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return env->lookup(id)->instantiate(mgr);
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}
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void ast_uid::translate(global_scope& scope) {
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}
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void ast_uid::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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into.push_back(instruction_ptr(
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new instruction_pushglobal(this->env->get_mangled_name(id))));
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}
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void ast_binop::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "BINOP: " << op_name(op) << std::endl;
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left->print(indent + 1, to);
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right->print(indent + 1, to);
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}
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void ast_binop::find_free(std::set<std::string>& into) {
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left->find_free(into);
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right->find_free(into);
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}
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type_ptr ast_binop::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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type_ptr ltype = left->typecheck(mgr, env);
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type_ptr rtype = right->typecheck(mgr, env);
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type_ptr ftype = env->lookup(op_name(op))->instantiate(mgr);
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if(!ftype) throw type_error(std::string("unknown binary operator ") + op_name(op));
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type_ptr return_type = mgr.new_type();
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type_ptr arrow_one = type_ptr(new type_arr(rtype, return_type));
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type_ptr arrow_two = type_ptr(new type_arr(ltype, arrow_one));
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mgr.unify(arrow_two, ftype);
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return return_type;
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}
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void ast_binop::translate(global_scope& scope) {
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left->translate(scope);
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right->translate(scope);
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}
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void ast_binop::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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right->compile(env, into);
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left->compile(env_ptr(new env_offset(1, env)), into);
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into.push_back(instruction_ptr(new instruction_pushglobal(op_action(op))));
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into.push_back(instruction_ptr(new instruction_mkapp()));
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into.push_back(instruction_ptr(new instruction_mkapp()));
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}
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void ast_app::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "APP:" << std::endl;
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left->print(indent + 1, to);
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right->print(indent + 1, to);
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}
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void ast_app::find_free(std::set<std::string>& into) {
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left->find_free(into);
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right->find_free(into);
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}
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type_ptr ast_app::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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type_ptr ltype = left->typecheck(mgr, env);
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type_ptr rtype = right->typecheck(mgr, env);
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type_ptr return_type = mgr.new_type();
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type_ptr arrow = type_ptr(new type_arr(rtype, return_type));
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mgr.unify(arrow, ltype);
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return return_type;
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}
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void ast_app::translate(global_scope& scope) {
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left->translate(scope);
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right->translate(scope);
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}
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void ast_app::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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right->compile(env, into);
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left->compile(env_ptr(new env_offset(1, env)), into);
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into.push_back(instruction_ptr(new instruction_mkapp()));
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}
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void ast_case::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "CASE: " << std::endl;
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for(auto& branch : branches) {
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print_indent(indent + 1, to);
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branch->pat->print(to);
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to << std::endl;
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branch->expr->print(indent + 2, to);
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}
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}
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void ast_case::find_free(std::set<std::string>& into) {
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of->find_free(into);
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for(auto& branch : branches) {
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std::set<std::string> free_in_branch;
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std::set<std::string> pattern_variables;
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branch->pat->find_variables(pattern_variables);
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branch->expr->find_free(free_in_branch);
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for(auto& free : free_in_branch) {
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if(pattern_variables.find(free) == pattern_variables.end())
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into.insert(free);
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}
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}
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}
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type_ptr ast_case::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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type_var* var;
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type_ptr case_type = mgr.resolve(of->typecheck(mgr, env), var);
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type_ptr branch_type = mgr.new_type();
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for(auto& branch : branches) {
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type_env_ptr new_env = type_scope(env);
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branch->pat->typecheck(case_type, mgr, new_env);
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type_ptr curr_branch_type = branch->expr->typecheck(mgr, new_env);
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mgr.unify(branch_type, curr_branch_type);
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}
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input_type = mgr.resolve(case_type, var);
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type_app* app_type;
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if(!(app_type = dynamic_cast<type_app*>(input_type.get())) ||
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!dynamic_cast<type_data*>(app_type->constructor.get())) {
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throw type_error("attempting case analysis of non-data type");
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}
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return branch_type;
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}
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void ast_case::translate(global_scope& scope) {
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of->translate(scope);
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for(auto& branch : branches) {
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branch->expr->translate(scope);
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}
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}
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void ast_case::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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type_app* app_type = dynamic_cast<type_app*>(input_type.get());
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type_data* type = dynamic_cast<type_data*>(app_type->constructor.get());
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of->compile(env, into);
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into.push_back(instruction_ptr(new instruction_eval()));
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instruction_jump* jump_instruction = new instruction_jump();
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into.push_back(instruction_ptr(jump_instruction));
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for(auto& branch : branches) {
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std::vector<instruction_ptr> branch_instructions;
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pattern_var* vpat;
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pattern_constr* cpat;
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if((vpat = dynamic_cast<pattern_var*>(branch->pat.get()))) {
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branch->expr->compile(env_ptr(new env_offset(1, env)), branch_instructions);
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for(auto& constr_pair : type->constructors) {
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if(jump_instruction->tag_mappings.find(constr_pair.second.tag) !=
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jump_instruction->tag_mappings.end())
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break;
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jump_instruction->tag_mappings[constr_pair.second.tag] =
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jump_instruction->branches.size();
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}
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jump_instruction->branches.push_back(std::move(branch_instructions));
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} else if((cpat = dynamic_cast<pattern_constr*>(branch->pat.get()))) {
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env_ptr new_env = env;
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for(auto it = cpat->params.rbegin(); it != cpat->params.rend(); it++) {
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new_env = env_ptr(new env_var(branch->expr->env->get_mangled_name(*it), new_env));
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}
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branch_instructions.push_back(instruction_ptr(new instruction_split(
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cpat->params.size())));
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branch->expr->compile(new_env, branch_instructions);
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branch_instructions.push_back(instruction_ptr(new instruction_slide(
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cpat->params.size())));
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int new_tag = type->constructors[cpat->constr].tag;
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if(jump_instruction->tag_mappings.find(new_tag) !=
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jump_instruction->tag_mappings.end())
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throw type_error("technically not a type error: duplicate pattern");
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jump_instruction->tag_mappings[new_tag] =
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jump_instruction->branches.size();
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jump_instruction->branches.push_back(std::move(branch_instructions));
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}
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}
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for(auto& constr_pair : type->constructors) {
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if(jump_instruction->tag_mappings.find(constr_pair.second.tag) ==
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jump_instruction->tag_mappings.end())
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throw type_error("non-total pattern");
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}
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}
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void ast_let::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "LET: " << std::endl;
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in->print(indent + 1, to);
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}
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void ast_let::find_free(std::set<std::string>& into) {
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definitions.find_free(into);
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std::set<std::string> all_free;
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in->find_free(all_free);
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for(auto& free_var : all_free) {
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if(definitions.defs_defn.find(free_var) == definitions.defs_defn.end())
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into.insert(free_var);
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}
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}
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type_ptr ast_let::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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definitions.typecheck(mgr, env);
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return in->typecheck(mgr, definitions.env);
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}
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void ast_let::translate(global_scope& scope) {
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for(auto& def : definitions.defs_data) {
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def.second->into_globals(scope);
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}
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for(auto& def : definitions.defs_defn) {
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size_t original_params = def.second->params.size();
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std::string original_name = def.second->name;
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auto& global_definition = def.second->into_global(scope);
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size_t captured = global_definition.params.size() - original_params;
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type_env_ptr mangled_env = type_scope(env);
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mangled_env->bind(def.first, env->lookup(def.first), visibility::global);
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mangled_env->set_mangled_name(def.first, global_definition.name);
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ast_ptr global_app(new ast_lid(original_name));
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global_app->env = mangled_env;
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for(auto& param : global_definition.params) {
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if(!(captured--)) break;
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ast_ptr new_arg(new ast_lid(param));
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new_arg->env = env;
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global_app = ast_ptr(new ast_app(std::move(global_app), std::move(new_arg)));
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global_app->env = env;
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}
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translated_definitions.push_back({ def.first, std::move(global_app) });
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}
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in->translate(scope);
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}
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void ast_let::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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into.push_back(instruction_ptr(new instruction_alloc(translated_definitions.size())));
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env_ptr new_env = env;
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for(auto& def : translated_definitions) {
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new_env = env_ptr(new env_var(definitions.env->get_mangled_name(def.first), std::move(new_env)));
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}
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int offset = translated_definitions.size() - 1;
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for(auto& def : translated_definitions) {
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def.second->compile(new_env, into);
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into.push_back(instruction_ptr(new instruction_update(offset--)));
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}
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in->compile(new_env, into);
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into.push_back(instruction_ptr(new instruction_slide(translated_definitions.size())));
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}
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void ast_lambda::print(int indent, std::ostream& to) const {
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print_indent(indent, to);
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to << "LAMBDA";
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for(auto& param : params) {
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to << " " << param;
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}
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to << std::endl;
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body->print(indent+1, to);
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}
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void ast_lambda::find_free(std::set<std::string>& into) {
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body->find_free(free_variables);
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for(auto& param : params) {
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free_variables.erase(param);
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}
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into.insert(free_variables.begin(), free_variables.end());
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}
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type_ptr ast_lambda::typecheck(type_mgr& mgr, type_env_ptr& env) {
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this->env = env;
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var_env = type_scope(env);
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type_ptr return_type = mgr.new_type();
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type_ptr full_type = return_type;
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for(auto it = params.rbegin(); it != params.rend(); it++) {
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type_ptr param_type = mgr.new_type();
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var_env->bind(*it, param_type);
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full_type = type_ptr(new type_arr(std::move(param_type), full_type));
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}
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mgr.unify(return_type, body->typecheck(mgr, var_env));
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return full_type;
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}
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void ast_lambda::translate(global_scope& scope) {
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std::vector<std::string> function_params;
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for(auto& free_variable : free_variables) {
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if(env->is_global(free_variable)) continue;
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function_params.push_back(free_variable);
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}
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size_t captured_count = function_params.size();
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function_params.insert(function_params.end(), params.begin(), params.end());
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auto& new_function = scope.add_function("lambda", std::move(function_params), std::move(body));
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type_env_ptr mangled_env = type_scope(env);
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mangled_env->bind("lambda", type_scheme_ptr(nullptr), visibility::global);
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mangled_env->set_mangled_name("lambda", new_function.name);
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ast_ptr new_application = ast_ptr(new ast_lid("lambda"));
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new_application->env = mangled_env;
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for(auto& param : new_function.params) {
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if(!(captured_count--)) break;
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ast_ptr new_arg = ast_ptr(new ast_lid(param));
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new_arg->env = env;
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new_application = ast_ptr(new ast_app(std::move(new_application), std::move(new_arg)));
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new_application->env = env;
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}
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translated = std::move(new_application);
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}
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void ast_lambda::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {
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translated->compile(env, into);
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}
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void pattern_var::print(std::ostream& to) const {
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to << var;
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}
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void pattern_var::find_variables(std::set<std::string>& into) const {
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into.insert(var);
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}
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void pattern_var::typecheck(type_ptr t, type_mgr& mgr, type_env_ptr& env) const {
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env->bind(var, t);
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}
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void pattern_constr::print(std::ostream& to) const {
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to << constr;
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for(auto& param : params) {
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to << " " << param;
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}
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}
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void pattern_constr::find_variables(std::set<std::string>& into) const {
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into.insert(params.begin(), params.end());
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}
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void pattern_constr::typecheck(type_ptr t, type_mgr& mgr, type_env_ptr& env) const {
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type_scheme_ptr constructor_type_scheme = env->lookup(constr);
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if(!constructor_type_scheme) {
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throw type_error(std::string("pattern using unknown constructor ") + constr);
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}
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type_ptr constructor_type = constructor_type_scheme->instantiate(mgr);
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for(auto& param : params) {
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type_arr* arr = dynamic_cast<type_arr*>(constructor_type.get());
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if(!arr) throw type_error("too many parameters in constructor pattern");
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env->bind(param, arr->left);
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constructor_type = arr->right;
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}
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mgr.unify(t, constructor_type);
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}
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