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Implement case statements

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This commit is contained in:
Eugen Wissner
2025-04-10 23:55:56 +02:00
parent 18c4e79012
commit f68667d5e5
10 changed files with 135 additions and 94 deletions
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73
gcc/elna-generic.cc
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@ -138,7 +138,7 @@ namespace elna::gcc
location_t argument_location = get_location(&argument->position());
if (VOID_TYPE_P(TREE_VALUE(current_parameter)))
{
error_at(argument_location, "too many arguments, expected %i, got %lu",
error_at(argument_location, "Too many arguments, expected %i, got %lu",
list_length(TYPE_ARG_TYPES(symbol_type)) - 1, arguments.size());
this->current_expression = error_mark_node;
break;
@ -182,7 +182,7 @@ namespace elna::gcc
if (is_void_type(record_fields))
{
error_at(argument_location, "too many arguments, expected %i, got %lu",
error_at(argument_location, "Too many arguments, expected %i, got %lu",
list_length(TYPE_FIELDS(symbol)), arguments.size());
this->current_expression = error_mark_node;
break;
@ -632,7 +632,8 @@ namespace elna::gcc
&& (expression->operation() == boot::binary_operator::sum
|| expression->operation() == boot::binary_operator::subtraction))
{
this->current_expression = do_pointer_arithmetic(expression->operation(), left, right);
this->current_expression = do_pointer_arithmetic(expression->operation(),
left, right, expression_location);
if (this->current_expression == error_mark_node)
{
error_at(expression_location,
@ -767,6 +768,15 @@ namespace elna::gcc
location_t definition_location = get_location(&definition->position());
definition->body().accept(this);
if (extract_constant(definition_location))
{
this->current_expression = fold_init(this->current_expression);
}
else
{
this->current_expression = NULL_TREE;
return;
}
tree definition_tree = build_decl(definition_location, CONST_DECL,
get_identifier(definition->identifier.c_str()), TREE_TYPE(this->current_expression));
auto result = this->symbols->enter(definition->identifier, definition_tree);
@ -923,17 +933,16 @@ namespace elna::gcc
expression->index().accept(this);
if (!is_integral_type(TREE_TYPE(this->current_expression)))
{
error_at(location, "type '%s' cannot be used as index",
error_at(location, "Type '%s' cannot be used as index",
print_type(TREE_TYPE(this->current_expression)).c_str());
this->current_expression = error_mark_node;
return;
}
if (this->current_expression != elna_word_type_node)
{
this->current_expression = fold_convert(elna_word_type_node, this->current_expression);
this->current_expression = convert(elna_word_type_node, this->current_expression);
}
tree offset = build2(MINUS_EXPR, elna_word_type_node,
this->current_expression, size_one_node);
tree offset = build2(MINUS_EXPR, elna_word_type_node, this->current_expression, size_one_node);
if (is_array_type(TREE_TYPE(designator)))
{
@ -947,14 +956,14 @@ namespace elna::gcc
tree string_ptr = build3_loc(location, COMPONENT_REF, TREE_TYPE(elna_string_ptr_field_node),
designator, elna_string_ptr_field_node, NULL_TREE);
tree target_pointer = do_pointer_arithmetic(boot::binary_operator::sum, string_ptr, offset);
tree target_pointer = do_pointer_arithmetic(boot::binary_operator::sum, string_ptr, offset, location);
this->current_expression = build1_loc(location, INDIRECT_REF,
elna_char_type_node, target_pointer);
}
else
{
error_at(location, "indexing is not allowed on type '%s'",
error_at(location, "Indexing is not allowed on type '%s'",
print_type(TREE_TYPE(designator)).c_str());
this->current_expression = error_mark_node;
}
@ -1071,7 +1080,7 @@ namespace elna::gcc
if (is_array_type(aggregate_type) && expression->field() == "length")
{
this->current_expression = fold_convert(build_qualified_type(elna_word_type_node, TYPE_QUAL_CONST),
this->current_expression = convert(build_qualified_type(elna_word_type_node, TYPE_QUAL_CONST),
TYPE_MAX_VALUE(TYPE_DOMAIN(aggregate_type)));
}
else if (is_array_type(aggregate_type) && expression->field() == "ptr")
@ -1419,17 +1428,36 @@ namespace elna::gcc
void generic_visitor::visit(boot::case_statement *statement)
{
statement->condition().accept(this);
tree condition_expression = this->current_expression;
tree end_label_declaration = create_artificial_label(UNKNOWN_LOCATION);
tree unqualified_condition = get_qualified_type(TREE_TYPE(this->current_expression), TYPE_UNQUALIFIED);
if (!INTEGRAL_TYPE_P(unqualified_condition))
{
error_at(get_location(&statement->condition().position()),
"Case expressions can only be integral numbers, characters and enumerations, given '%s'",
print_type(unqualified_condition).c_str());
this->current_expression = NULL_TREE;
return;
}
tree end_label_declaration = create_artificial_label(get_location(&statement->position()));
tree switch_statements = alloc_stmt_list();
for (const boot::switch_case& case_block : statement->cases)
{
for (boot::literal_expression *const case_label : case_block.labels)
for (boot::expression *const case_label : case_block.labels)
{
case_label->accept(this);
tree case_label_declaration = create_artificial_label(get_location(&case_label->position()));
location_t case_location = get_location(&case_label->position());
if (extract_constant(case_location)
&& !is_assignable_from(unqualified_condition, this->current_expression))
{
error_at(case_location, "Case type '%s' does not match the expression type '%s'",
print_type(TREE_TYPE(this->current_expression)).c_str(),
print_type(unqualified_condition).c_str());
this->current_expression = error_mark_node;
}
tree case_label_declaration = create_artificial_label(case_location);
tree case_expression = build_case_label(this->current_expression, NULL_TREE, case_label_declaration);
append_to_statement_list(case_expression, &switch_statements);
@ -1452,4 +1480,21 @@ namespace elna::gcc
this->current_expression = NULL_TREE;
}
bool generic_visitor::extract_constant(location_t expression_location)
{
int code = TREE_CODE(this->current_expression);
if (code == CONST_DECL)
{
this->current_expression = DECL_INITIAL(this->current_expression);
}
else if (TREE_CODE_CLASS(code) != tcc_constant)
{
error_at(expression_location, "Expected a constant expression");
this->current_expression = error_mark_node;
return false;
}
return true;
}
}