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Allow assigning nil to any pointer

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This commit is contained in:
Eugen Wissner
2025-02-04 13:28:09 +01:00
parent aab16e4941
commit 8b654ed138
6 changed files with 108 additions and 192 deletions
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114
gcc/elna-generic.cc
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@ -25,37 +25,37 @@ namespace gcc
void generic_visitor::visit(boot::call_expression *expression)
{
if (auto symbol = this->symbol_map->lookup(expression->name()))
{
tree return_type = TREE_TYPE(TREE_TYPE(symbol->payload));
tree fndecl_type = build_function_type(return_type, TYPE_ARG_TYPES(symbol->payload));
tree printf_fn = build1(ADDR_EXPR, build_pointer_type(fndecl_type), symbol->payload);
tree symbol = this->symbol_map->lookup(expression->name());
std::vector<tree> arguments(expression->arguments().size());
for (std::size_t i = 0; i < expression->arguments().size(); ++i)
{
expression->arguments().at(i)->accept(this);
arguments[i] = this->current_expression;
}
tree stmt = build_call_array_loc(get_location(&expression->position()),
return_type, printf_fn, arguments.size(), arguments.data());
if (return_type == void_type_node)
{
append_to_statement_list(stmt, &this->current_statements);
this->current_expression = NULL_TREE;
}
else
{
this->current_expression = stmt;
}
}
else
if (symbol == NULL_TREE)
{
error_at(get_location(&expression->position()),
"procedure '%s' not declared",
expression->name().c_str());
this->current_expression = error_mark_node;
return;
}
tree return_type = TREE_TYPE(TREE_TYPE(symbol));
tree fndecl_type = build_function_type(return_type, TYPE_ARG_TYPES(symbol));
tree printf_fn = build1(ADDR_EXPR, build_pointer_type(fndecl_type), symbol);
std::vector<tree> arguments(expression->arguments().size());
for (std::size_t i = 0; i < expression->arguments().size(); ++i)
{
expression->arguments().at(i)->accept(this);
arguments[i] = this->current_expression;
}
tree stmt = build_call_array_loc(get_location(&expression->position()),
return_type, printf_fn, arguments.size(), arguments.data());
if (return_type == void_type_node)
{
append_to_statement_list(stmt, &this->current_statements);
this->current_expression = NULL_TREE;
}
else
{
this->current_expression = stmt;
}
}
@ -74,22 +74,21 @@ namespace gcc
{
auto body_type = build_type(expression->body());
this->current_expression = build1(CONVERT_EXPR,
this->symbol_map->lookup("Word")->payload, TYPE_SIZE_UNIT(body_type));
this->current_expression = build1(CONVERT_EXPR, this->symbol_map->lookup("Word"), TYPE_SIZE_UNIT(body_type));
}
bool generic_visitor::is_integral_type(tree type)
{
gcc_assert(TYPE_P(type));
return type == this->symbol_map->lookup("Int")->payload
|| type == this->symbol_map->lookup("Word")->payload;
return type == this->symbol_map->lookup("Int")
|| type == this->symbol_map->lookup("Word");
}
bool generic_visitor::is_numeric_type(tree type)
{
return is_integral_type(type)
|| type == this->symbol_map->lookup("Float")->payload;
|| type == this->symbol_map->lookup("Float");
}
void generic_visitor::visit(boot::program *program)
@ -130,7 +129,7 @@ namespace gcc
get_identifier(argument_name.c_str()), parameter_types[i]);
DECL_CONTEXT(argc_declaration_tree) = this->main_fndecl;
DECL_ARG_TYPE(argc_declaration_tree) = parameter_types[i];
this->symbol_map->enter(argument_name, boot::make_info(argc_declaration_tree));
this->symbol_map->enter(argument_name, argc_declaration_tree);
argument_chain.append(argc_declaration_tree);
}
DECL_ARGUMENTS(this->main_fndecl) = argument_chain.head();
@ -171,7 +170,7 @@ namespace gcc
tree declaration_type = build_function_type_array(return_type,
definition->parameters.size(), parameter_types.data());
this->main_fndecl = build_fn_decl(definition->identifier().c_str(), declaration_type);
this->symbol_map->enter(definition->identifier(), boot::make_info(this->main_fndecl));
this->symbol_map->enter(definition->identifier(), this->main_fndecl);
if (definition->body() != nullptr)
{
@ -193,7 +192,7 @@ namespace gcc
if (definition->body() != nullptr)
{
this->symbol_map->enter(parameter->identifier(), boot::make_info(declaration_tree));
this->symbol_map->enter(parameter->identifier(), declaration_tree);
}
argument_chain.append(declaration_tree);
}
@ -243,14 +242,14 @@ namespace gcc
{
auto symbol = this->symbol_map->lookup("Int");
this->current_expression = build_int_cst(symbol->payload, literal->number());
this->current_expression = build_int_cst(symbol, literal->number());
}
void generic_visitor::visit(boot::number_literal<std::uint32_t> *literal)
{
auto symbol = this->symbol_map->lookup("Word");
this->current_expression = build_int_cstu(symbol->payload, literal->number());
this->current_expression = build_int_cstu(symbol, literal->number());
}
void generic_visitor::visit(boot::number_literal<double> *literal)
@ -272,14 +271,14 @@ namespace gcc
{
auto symbol = this->symbol_map->lookup("Bool");
this->current_expression = build_int_cst_type(symbol->payload, boolean->number());
this->current_expression = build_int_cst_type(symbol, boolean->number());
}
void generic_visitor::visit(boot::number_literal<unsigned char> *character)
{
auto symbol = this->symbol_map->lookup("Char");
this->current_expression = build_int_cstu(symbol->payload, character->number());
this->current_expression = build_int_cstu(symbol, character->number());
}
void generic_visitor::visit(boot::number_literal<nullptr_t> *)
@ -303,7 +302,7 @@ namespace gcc
tree_code operator_code, tree left, tree right)
{
return build_binary_operation(is_numeric_type(TREE_TYPE(left)) || is_pointer_type(TREE_TYPE(left)),
expression, operator_code, left, right, this->symbol_map->lookup("Bool")->payload);
expression, operator_code, left, right, this->symbol_map->lookup("Bool"));
}
tree generic_visitor::build_logic_operation(boot::binary_expression *expression,
@ -311,15 +310,15 @@ namespace gcc
{
auto symbol = this->symbol_map->lookup("Bool");
return build_binary_operation(TREE_TYPE(left) == symbol->payload,
expression, operator_code, left, right, symbol->payload);
return build_binary_operation(TREE_TYPE(left) == symbol,
expression, operator_code, left, right, symbol);
}
tree generic_visitor::build_equality_operation(boot::binary_expression *expression,
tree_code operator_code, tree left, tree right)
{
return build_binary_operation(true, expression,
operator_code, left, right, this->symbol_map->lookup("Bool")->payload);
operator_code, left, right, this->symbol_map->lookup("Bool"));
}
void generic_visitor::visit(boot::binary_expression *expression)
@ -425,7 +424,7 @@ namespace gcc
tree definition_tree = build_decl(definition_location, CONST_DECL,
get_identifier(definition->identifier().c_str()), TREE_TYPE(this->current_expression));
auto result = this->symbol_map->enter(definition->identifier(), boot::make_info(definition_tree));
auto result = this->symbol_map->enter(definition->identifier(), definition_tree);
if (result)
{
@ -457,7 +456,7 @@ namespace gcc
location_t definition_location = get_location(&definition->position());
tree definition_tree = build_decl(definition_location, TYPE_DECL,
get_identifier(definition->identifier().c_str()), tree_type);
auto result = this->symbol_map->enter(definition->identifier(), boot::make_info(tree_type));
auto result = this->symbol_map->enter(definition->identifier(), tree_type);
if (result)
{
@ -480,11 +479,11 @@ namespace gcc
{
if (boot::basic_type_expression *basic_type = type.is_basic())
{
auto symbol = this->symbol_map->lookup(basic_type->base_name());
tree symbol = this->symbol_map->lookup(basic_type->base_name());
if (symbol && TYPE_P(symbol->payload))
if (symbol != NULL_TREE && TYPE_P(symbol))
{
return symbol->payload;
return symbol;
}
error_at(get_location(&basic_type->position()),
"type '%s' not declared", basic_type->base_name().c_str());
@ -590,7 +589,7 @@ namespace gcc
location_t declaration_location = get_location(&declaration->position());
tree declaration_tree = build_decl(declaration_location, VAR_DECL,
get_identifier(declaration->identifier().c_str()), declaration_type);
bool result = this->symbol_map->enter(declaration->identifier(), boot::make_info(declaration_tree));
bool result = this->symbol_map->enter(declaration->identifier(), declaration_tree);
if (!result)
{
@ -618,7 +617,7 @@ namespace gcc
{
auto symbol = this->symbol_map->lookup(expression->name());
if (!symbol)
if (symbol == NULL_TREE)
{
error_at(get_location(&expression->position()),
"variable '%s' not declared in the current scope",
@ -626,7 +625,7 @@ namespace gcc
this->current_expression = error_mark_node;
return;
}
this->current_expression = symbol->payload;
this->current_expression = symbol;
}
void generic_visitor::visit(boot::array_access_expression *expression)
@ -699,20 +698,23 @@ namespace gcc
this->current_expression = error_mark_node;
return;
}
if (TREE_TYPE(this->current_expression) != TREE_TYPE(lvalue))
if (TREE_TYPE(this->current_expression) == TREE_TYPE(lvalue)
|| (is_pointer_type(TREE_TYPE(lvalue)) && this->current_expression == null_pointer_node))
{
tree assignment = build2_loc(statement_location, MODIFY_EXPR,
void_type_node, lvalue, this->current_expression);
append_to_statement_list(assignment, &this->current_statements);
this->current_expression = NULL_TREE;
}
else
{
error_at(statement_location,
"cannot assign value of type %s to variable of type %s",
print_type(TREE_TYPE(this->current_expression)),
print_type(TREE_TYPE(lvalue)));
this->current_expression = error_mark_node;
return;
}
auto assignment = build2_loc(statement_location, MODIFY_EXPR,
void_type_node, lvalue, this->current_expression);
append_to_statement_list(assignment, &this->current_statements);
this->current_expression = NULL_TREE;
}
void generic_visitor::visit(boot::if_statement *statement)