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/* Literal sign folding.
Copyright (C) 2025 Free Software Foundation, Inc.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "elna/boot/materialization.h"
namespace elna::boot
{
materialization_error::materialization_error(const source_position position, kind error_kind)
: diagnostic(position), m_kind(error_kind)
{
}
std::string materialization_error::what() const
{
switch (this->m_kind)
{
using enum kind;
case integer_overflow:
return "Integer literal overflows";
case real_overflow:
return "Real literal overflows";
case local_export:
return "Local symbols cannot be exported";
case field_export:
return "Record fields cannot be exported";
}
__builtin_unreachable();
}
materialization_visitor::materialization_visitor(const target_info& target)
: target(target)
{
}
void materialization_visitor::visit(procedure_declaration *declaration)
{
this->in_global_scope = false;
walking_visitor::visit(declaration);
this->in_global_scope = true;
}
void materialization_visitor::visit(variable_declaration *declaration)
{
walking_visitor::visit(declaration);
for (const auto& variable_identifier : declaration->identifiers)
{
if (!this->in_global_scope && variable_identifier.exported())
{
add_error<materialization_error>(variable_identifier.id().position(),
materialization_error::kind::local_export);
}
}
}
void materialization_visitor::visit(record_type_expression *expression)
{
for (const auto& [field_identifiers, field_type] : expression->fields)
{
field_type->accept(this);
for (const auto& field_identifier : field_identifiers)
{
if (field_identifier.exported())
{
add_error<materialization_error>(field_identifier.id().position(),
materialization_error::kind::field_export);
}
}
}
}
void materialization_visitor::visit(literal<integer_literal> *literal)
{
switch (literal->wants_signed)
{
using enum integer_sign;
case negative:
if (auto negated_literal = literal->value.negate())
{
literal->value = negated_literal.value();
if (!literal->has_explicit_size
&& !literal->value.fit_into(true, target.int_properties.front().size))
{
add_error<materialization_error>(literal->position(),
materialization_error::kind::integer_overflow);
}
}
else
{
add_error<materialization_error>(literal->position(),
materialization_error::kind::integer_overflow);
}
break;
case unmarked:
{
const auto target_size = literal->has_explicit_size
? literal->value.size()
: target.int_properties.front().size;
if (!literal->value.fit_into(true, target_size))
{
add_error<materialization_error>(literal->position(),
materialization_error::kind::integer_overflow);
}
break;
}
case _unsigned:
if (!literal->has_explicit_size
&& !literal->value.fit_into(false, target.word_properties.front().size))
{
add_error<materialization_error>(literal->position(),
materialization_error::kind::integer_overflow);
}
break;
}
}
void materialization_visitor::visit(literal<float_literal> *literal)
{
if (!literal->value.is_finite())
{
add_error<materialization_error>(literal->position(),
materialization_error::kind::real_overflow);
}
}
void materialization_visitor::visit_entry_point(unit *unit)
{
this->in_global_scope = false;
walking_visitor::visit_entry_point(unit);
this->in_global_scope = true;
}
}
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