void symbol_delete(SYMBOL* symbol)
{
int i;
free(symbol->id);
switch (symbol->type)
{
case t_symbol_var:
free_type_decl(symbol->data.var_data.type);
break;
case t_symbol_class:
break;
case t_symbol_loop:
break;
case t_symbol_func:
free_type_decl(symbol->data.func_data.type);
for (i = 0; i < symbol->data.func_data.nArgs; i++)
free_func_def_arg(symbol->data.func_data.args[i]);
free(symbol->data.func_data.args);
break;
case t_symbol_switch:
free_type_object(symbol->data.switch_data.type);
break;
}
free(symbol);
}
void free_type_decls(typedecllist_t type_decls)
{
for (unsigned i = 0; i < type_decls.size; ++i)
{
free_type_decl(type_decls.data[i]);
}
list_free(type_decls);
}
int check_return(is_return* node)
{
int errors = 0;
SCOPE* scope;
is_type_decl *type = NULL, *typeR;
char *typeA, *typeB;
if (node->value)
{
errors += check_expr(node->value);
typeR = node->value->s_type;
} else
{
type = new_type_decl_void(node->line);
typeR = type;
}
if (errors == 0)
{
scope = scope_get_by_name(symtab, NULL, t_symbol_func);
node->symbol = scope->symbol;
if (!type_type_equal(typeR, node->symbol->data.func_data.type))
{
typeA = string_type_decl(typeR);
typeB = string_type_decl(node->symbol->data.func_data.type);
errors++;
pretty_error(node->line, "invalid return type %s should be of type %s",
typeA,
typeB
);
free(typeA);
free(typeB);
}
}
if (type)
free_type_decl(type);
return errors;
}
int check_func_def(is_func_def* node, bool first_pass)
{
SYMBOL* symbol;
SCOPE* tempscope;
int label;
int errors = 0;
is_type_decl *tmpType = NULL;
if (first_pass)
{
errors += check_type_decl(node->type);
symbol = scope_lookup(symtab, node->id->name, t_symbol_func);
if (symbol)
{
pretty_error(node->line, "symbol \"%s\" is already defined (previous declaration was here: %d)", node->id->name, symbol->line);
errors++;
} else
{
tempscope = scope_new(NULL, false);
scope_push(tempscope);
errors += check_func_def_args(node->args);
scope_pop();
if (strcmp(node->id->name, "main") == 0)
{
label = 0;
if (node->args) /* no args is valid */
{
if (node->args->length == 1) /* main may must not have more than two arguments */
{
tmpType = insert_type_decl_array(insert_array_decl(insert_type_object(t_type_native_string), new_dims_empty_list(0, 1))); /* must be an array of Strings */
if (!type_type_equal(tmpType,node->args->node->type))
{
errors++;
pretty_error(node->line, "main function arguments do not match any valid prototypes");
}
free_type_decl(tmpType);
} else
{
errors++;
pretty_error(node->line, "main function arguments do not match any valid prototypes");
}
}
tmpType = insert_type_decl_object(insert_type_object(t_type_native_int)); /* return value must be int or void */
if (!type_type_equal(tmpType,node->type))
{
free_type_decl(tmpType);
tmpType = new_type_decl_void(0); /* check for void */
if (!type_type_equal(tmpType,node->type)) /* none; errors occurred */
{
errors++;
pretty_error(node->line, "main function return type does not match any valid types (nor int nor void)");
}
}
free_type_decl(tmpType);
} else
label = ++label_counter;
symbol = symbol_new_func(node->id->name, node->line, node->type, node->args, label);
scope_delete(tempscope);
scope_insert(symtab, symbol);
node->scope = scope_new(symbol, false);
}
} else
{
scope_push(node->scope);
errors += check_func_def_args(node->args); /* this will not give errors */
errors += check_stmt_list(node->body);
if ((!node->body || !node->body->terminated) &&
!(node->type->type == t_type_decl_type_object && node->type->data.type_object->type == t_type_native_void))
{
pretty_error(node->line, "reached end of non void function");
errors++;
}
scope_pop();
}
return errors;
}
int check_var_defs(is_var_defs* node, bool first_pass)
{
int errors = 0;
SYMBOL *symbol;
is_type_decl *type = NULL;
is_var_def_list *it;
errors += check_type_decl(node->type);
errors += check_var_def_list(node->list);
for (it = node->list; it != NULL; it = it->next)
{
symbol = scope_local_lookup(symtab, it->node->left->id->name, t_symbol_var);
if (symbol)
{
errors++;
pretty_error(it->node->line, "symbol \"%s\" is already defined (previous declaration was here: %d)", it->node->left->id->name, symbol->line);
} else
{
if (it->node->left->empty->size != 0)
{
if (node->type->type != t_type_decl_array_decl)
{
/* create a new type_decl (array) with it->node->left->data.empty->size dimensions */
type = insert_type_decl_array(insert_array_decl(insert_type_object(node->type->data.type_object->type), new_dims_empty_list(node->type->line, it->node->left->empty->size)));
} else
{
/* type is already a type_decl_array, only dims update is needed */
type = duplicate_type_decl(node->type);
type->data.array->dims->size += it->node->left->empty->size;
}
} else /* no dims updates are needed; even if the type is "dimmed" this is only a copy of the type */
type = duplicate_type_decl(node->type);
if (first_pass)
symbol = scope_insert(symtab, symbol_new_var(it->node->left->id->name, node->line, type, true, globalpos++));
else
symbol = scope_insert(symtab, symbol_new_var(it->node->left->id->name, node->line, type, false, symtab->framepos++));
it->node->left->symbol = symbol;
if (it->node->var_init) /* check initialization if it exists */
{
if (type_var_init_assign_able(type, (type->type == t_type_decl_array_decl ? type->data.array->dims->size : 0), it->node->var_init))
/* if initialization is valid */
symbol->data.var_data.initialized = true;
else
{
errors++;
pretty_error(it->node->line, "variable \"%s\" initalization is invalid", it->node->left->id->name);
}
}
}
free_type_decl(type);
}
return errors;
}
