elna/source/semantic.cpp

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#include "elna/source/semantic.hpp"
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#include "elna/source/result.hpp"
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#include <cstdlib>
namespace elna::source
{
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name_analysis_visitor::name_analysis_visitor(std::shared_ptr<symbol_table> table,
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const std::filesystem::path& filename, const std::size_t target_pointer_size)
: table(table), filename(filename), pointer_size(target_pointer_size)
{
}
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void name_analysis_visitor::visit(constant_definition *definition)
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{
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auto constant_type = std::make_shared<const class type>(int_type);
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this->table->enter(definition->identifier(),
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std::make_shared<constant_info>(constant_type, definition->body().number()));
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}
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std::shared_ptr<const type> name_analysis_visitor::convert_declaration_type(const type_expression& ast_type) const
{
auto variable_type = std::dynamic_pointer_cast<type_info>(table->lookup(ast_type.base()))
->type();
std::shared_ptr<type> declaration_type;
if (ast_type.is_pointer())
{
return std::make_shared<pointer_type>(variable_type, 4);
}
else
{
return variable_type;
}
}
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void name_analysis_visitor::visit(declaration *declaration)
{
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std::shared_ptr<const type> declaration_type = convert_declaration_type(declaration->type());
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this->table->enter(declaration->identifier(),
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std::make_shared<variable_info>(declaration_type));
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}
void name_analysis_visitor::visit(program *program)
{
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class procedure_type main_type{ std::vector<std::shared_ptr<const class type>>(), this->pointer_size };
this->table->enter("_start", std::make_shared<procedure_info>(main_type, this->table));
empty_visitor::visit(program);
}
void name_analysis_visitor::visit(procedure_definition *procedure)
{
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std::vector<std::shared_ptr<const type>> arguments;
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for (auto& parameter : procedure->parameters())
{
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auto declaration_type = convert_declaration_type(parameter->type());
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arguments.push_back(declaration_type);
}
procedure_type definition_type{ std::move(arguments), this->pointer_size };
auto info = std::make_shared<procedure_info>(definition_type, this->table);
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this->table->enter(procedure->identifier(), info);
this->table = info->scope();
for (std::size_t i = 0; i < procedure->parameters().size(); ++i)
{
this->table->enter(procedure->parameters().at(i)->identifier(),
std::make_shared<parameter_info>(definition_type.arguments.at(i)));
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}
procedure->body().accept(this);
this->table = info->scope()->scope();
}
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const std::list<std::unique_ptr<error>>& name_analysis_visitor::errors() const noexcept
{
return m_errors;
}
allocator_visitor::allocator_visitor(std::shared_ptr<symbol_table> table)
: table(table)
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{
}
void allocator_visitor::visit(declaration *declaration)
{
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auto declaration_info = this->table->lookup(declaration->identifier());
if (auto variable = std::dynamic_pointer_cast<variable_info>(declaration_info))
{
this->local_offset -= sizeof(std::int32_t);
variable->offset = this->local_offset;
}
else if (auto parameter = std::dynamic_pointer_cast<parameter_info>(declaration_info))
{
parameter->offset = this->argument_offset;
this->argument_offset += sizeof(std::int32_t);
}
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}
void allocator_visitor::visit(program *program)
{
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this->local_offset = 0;
this->argument_offset = 0;
empty_visitor::visit(program);
std::dynamic_pointer_cast<procedure_info>(table->lookup("_start"))->local_stack_size =
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std::abs(this->local_offset);
}
void allocator_visitor::visit(procedure_definition *procedure)
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{
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this->local_offset = 0;
this->argument_offset = 0;
auto info = std::dynamic_pointer_cast<procedure_info>(this->table->lookup(procedure->identifier()));
this->table = info->scope();
empty_visitor::visit(procedure);
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this->table = info->scope()->scope();
info->local_stack_size = std::abs(this->local_offset);
info->argument_stack_size = this->argument_offset;
}
void allocator_visitor::visit(call_statement *statement)
{
auto call_info = std::dynamic_pointer_cast<intrinsic_info>(this->table->lookup(statement->name()));
this->argument_offset = std::max(static_cast<std::size_t>(this->argument_offset),
call_info->parameter_stack_size());
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}
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type_analysis_visitor::type_analysis_visitor(std::shared_ptr<symbol_table> table,
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const std::filesystem::path& filename, const std::size_t target_pointer_size)
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: table(table), filename(filename), pointer_size(target_pointer_size)
{
}
void type_analysis_visitor::visit(program *program)
{
for (auto& definition : program->definitions())
{
if (dynamic_cast<procedure_definition *>(definition.get()) != nullptr)
{
definition->accept(this);
}
}
program->body().accept(this);
}
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void type_analysis_visitor::visit(procedure_definition *procedure)
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{
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auto info = std::dynamic_pointer_cast<procedure_info>(this->table->lookup(procedure->identifier()));
this->table = info->scope();
procedure->body().accept(this);
this->table = info->scope()->scope();
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}
void type_analysis_visitor::visit(integer_literal *literal)
{
literal->data_type = std::dynamic_pointer_cast<type_info>(table->lookup("Int"))->type();
}
void type_analysis_visitor::visit(boolean_literal *literal)
{
literal->data_type = std::dynamic_pointer_cast<type_info>(table->lookup("Boolean"))->type();
}
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void type_analysis_visitor::visit(variable_expression *expression)
{
expression->data_type = std::dynamic_pointer_cast<typed_info>(table->lookup(expression->name()))->type();
}
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void type_analysis_visitor::visit(unary_expression *expression)
{
empty_visitor::visit(expression);
switch (expression->operation())
{
case unary_operator::reference:
expression->data_type = std::make_shared<const pointer_type>(expression->operand().data_type,
this->pointer_size);
break;
case unary_operator::dereference:
auto operand_type = expression->operand().data_type;
if (auto referenced_type = std::dynamic_pointer_cast<const pointer_type>(operand_type))
{
expression->data_type = referenced_type;
}
else if (operand_type != nullptr)
{
auto new_error = std::make_unique<type_mismatch>(operand_type,
type_mismatch::operation::dereference, this->filename, expression->position());
m_errors.push_back(std::move(new_error));
}
break;
}
}
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void type_analysis_visitor::visit(binary_expression *expression)
{
empty_visitor::visit(expression);
switch (expression->operation())
{
case binary_operator::sum:
case binary_operator::subtraction:
case binary_operator::multiplication:
case binary_operator::division:
case binary_operator::less:
case binary_operator::greater:
case binary_operator::less_equal:
case binary_operator::greater_equal:
if (expression->lhs().data_type != nullptr && expression->rhs().data_type != nullptr)
{
auto lhs_type = std::dynamic_pointer_cast<const primitive_type>(expression->lhs().data_type);
auto rhs_type = std::dynamic_pointer_cast<const primitive_type>(expression->rhs().data_type);
std::unique_ptr<type_mismatch> new_error;
if (lhs_type == nullptr || *lhs_type != int_type)
{
new_error = std::make_unique<type_mismatch>(lhs_type,
type_mismatch::operation::arithmetic, this->filename, expression->lhs().position());
}
if (rhs_type == nullptr || *rhs_type != int_type)
{
new_error = std::make_unique<type_mismatch>(rhs_type,
type_mismatch::operation::arithmetic, this->filename, expression->rhs().position());
}
if (new_error != nullptr)
{
m_errors.push_back(std::move(new_error));
}
}
break;
case binary_operator::equals:
case binary_operator::not_equals:
if (expression->lhs().data_type != nullptr && expression->rhs().data_type != nullptr)
{
if (expression->lhs().data_type != expression->rhs().data_type)
{
auto new_error = std::make_unique<type_mismatch>(expression->rhs().data_type,
type_mismatch::operation::comparison, this->filename, expression->rhs().position());
}
}
break;
}
}
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void type_analysis_visitor::visit(call_statement *statement)
{
auto call_info = std::dynamic_pointer_cast<intrinsic_info>(this->table->lookup(statement->name()));
std::size_t i{ 0 };
for (const auto& argument : statement->arguments())
{
argument->accept(this);
if (argument->data_type != nullptr && i < call_info->type()->arguments.size()
&& call_info->type()->arguments[i] != argument->data_type)
{
auto new_error = std::make_unique<type_mismatch>(argument->data_type,
type_mismatch::operation::argument, this->filename, argument->position());
m_errors.push_back(std::move(new_error));
}
++i;
}
}
void type_analysis_visitor::visit(constant_definition *definition)
{
definition->body().accept(this);
}
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void type_analysis_visitor::visit(while_statement *statement)
{
statement->prerequisite().accept(this);
auto condition_type = std::dynamic_pointer_cast<const primitive_type>(statement->prerequisite().data_type);
if (condition_type != nullptr && *condition_type != boolean_type)
{
auto new_error = std::make_unique<type_mismatch>(condition_type,
type_mismatch::operation::condition, this->filename, statement->prerequisite().position());
m_errors.push_back(std::move(new_error));
}
statement->body().accept(this);
}
void type_analysis_visitor::visit(if_statement *statement)
{
statement->prerequisite().accept(this);
auto condition_type = std::dynamic_pointer_cast<const primitive_type>(statement->prerequisite().data_type);
if (condition_type != nullptr && *condition_type != boolean_type)
{
auto new_error = std::make_unique<type_mismatch>(condition_type,
type_mismatch::operation::condition, this->filename, statement->prerequisite().position());
m_errors.push_back(std::move(new_error));
}
statement->body().accept(this);
}
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const std::list<std::unique_ptr<error>>& type_analysis_visitor::errors() const noexcept
{
return m_errors;
}
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}