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/* valacreationmethod.vala
*
* Copyright (C) 2007-2009 Jürg Billeter
* Copyright (C) 2007-2008 Raffaele Sandrini
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Raffaele Sandrini <raffaele@sandrini.ch>
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents a type creation method.
*/
public class Vala.CreationMethod : Method {
/**
* Specifies the name of the type this creation method belongs to.
*/
public string class_name { get; set; }
/**
* Specifies the number of parameters this creation method sets.
*/
public int n_construction_params { get; set; }
/**
* Specifies a custom C return type for that creation method.
* Only the idl parser and the interface writer should use this.
* FIXME: remove this as soon the compiler has a decent attribute
* handling.
*/
public string? custom_return_type_cname { get; set; }
/**
* Specifies whether this constructor chains up to a base
* constructor or a different constructor of the same class.
*/
public bool chain_up { get; set; }
/**
* Creates a new method.
*
* @param name method name
* @param source_reference reference to source code
* @return newly created method
*/
public CreationMethod (string? class_name, string? name, SourceReference? source_reference = null) {
base (name, new VoidType (), source_reference);
this.class_name = class_name;
carray_length_parameter_position = -3;
cdelegate_target_parameter_position = -3;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_creation_method (this);
}
public override void accept_children (CodeVisitor visitor) {
foreach (FormalParameter param in get_parameters()) {
param.accept (visitor);
}
foreach (DataType error_type in get_error_types ()) {
error_type.accept (visitor);
}
if (body != null) {
body.accept (visitor);
}
}
public override string get_default_cname () {
var parent = parent_symbol as TypeSymbol;
string infix = "new";
if (parent is Struct) {
infix = "init";
}
if (name == ".new") {
return "%s%s".printf (parent.get_lower_case_cprefix (), infix);
} else {
return "%s%s_%s".printf (parent.get_lower_case_cprefix (), infix, name);
}
}
public override string get_real_cname () {
var parent = parent_symbol as Class;
if (parent == null || parent.is_compact) {
return get_cname ();
}
string infix = "construct";
if (name == ".new") {
return "%s%s".printf (parent.get_lower_case_cprefix (), infix);
} else {
return "%s%s_%s".printf (parent.get_lower_case_cprefix (), infix, name);
}
}
public override bool check (SemanticAnalyzer analyzer) {
if (checked) {
return !error;
}
checked = true;
process_attributes ();
if (class_name != null && class_name != parent_symbol.name) {
// class_name is null for constructors generated by GIdlParser
Report.error (source_reference, "missing return type in method `%s.%s´".printf (analyzer.current_symbol.get_full_name (), class_name));
error = true;
return false;
}
var old_source_file = analyzer.current_source_file;
var old_symbol = analyzer.current_symbol;
if (source_reference != null) {
analyzer.current_source_file = source_reference.file;
}
analyzer.current_symbol = this;
foreach (FormalParameter param in get_parameters()) {
param.check (analyzer);
}
foreach (DataType error_type in get_error_types ()) {
error_type.check (analyzer);
}
if (body != null) {
body.check (analyzer);
var cl = parent_symbol as Class;
// count construction property assignments
if (analyzer.context.profile == Profile.GOBJECT && cl != null
&& cl.is_subtype_of (analyzer.object_type)) {
int n_params = 0;
foreach (Statement stmt in body.get_statements ()) {
var expr_stmt = stmt as ExpressionStatement;
if (expr_stmt != null) {
Property prop = expr_stmt.assigned_property ();
if (prop != null && prop.set_accessor.construction) {
n_params++;
}
}
}
n_construction_params = n_params;
}
// ensure we chain up to base constructor
if (!chain_up && cl != null && cl.base_class != null) {
if (cl.base_class.default_construction_method != null
&& !cl.base_class.default_construction_method.has_construct_function) {
// chain up impossible
} else if (analyzer.context.profile == Profile.GOBJECT && cl.base_class == analyzer.object_type) {
// no chain up necessary for direct GObject subclasses
} else if (analyzer.context.profile == Profile.GOBJECT
&& cl.is_subtype_of (analyzer.object_type)
&& n_construction_params > 0) {
// no chain up when using GObject construct properties
} else if (cl.base_class.default_construction_method == null
|| cl.base_class.default_construction_method.access == SymbolAccessibility.PRIVATE) {
Report.warning (source_reference, "unable to chain up to private base constructor");
} else if (cl.base_class.default_construction_method.get_required_arguments () > 0) {
Report.warning (source_reference, "unable to chain up to base constructor requiring arguments");
} else {
var old_insert_block = analyzer.insert_block;
analyzer.current_symbol = body;
analyzer.insert_block = body;
var stmt = new ExpressionStatement (new MethodCall (new BaseAccess (source_reference), source_reference), source_reference);
body.insert_statement (0, stmt);
stmt.check (analyzer);
analyzer.current_symbol = this;
analyzer.insert_block = old_insert_block;
}
}
}
analyzer.current_source_file = old_source_file;
analyzer.current_symbol = old_symbol;
if (is_abstract || is_virtual || overrides) {
Report.error (source_reference, "The creation method `%s' cannot be marked as override, virtual, or abstract".printf (get_full_name ()));
return false;
}
// check that all errors that can be thrown in the method body are declared
if (body != null) {
foreach (DataType body_error_type in body.get_error_types ()) {
bool can_propagate_error = false;
foreach (DataType method_error_type in get_error_types ()) {
if (body_error_type.compatible (method_error_type)) {
can_propagate_error = true;
}
}
if (!can_propagate_error) {
Report.warning (body_error_type.source_reference, "unhandled error `%s'".printf (body_error_type.to_string()));
}
}
}
return !error;
}
}
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