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/* valapointertype.vala
*
* Copyright (C) 2007-2009 Jürg Billeter
*
* 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:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* A pointer type.
*/
public class Vala.PointerType : DataType {
/**
* The base type the pointer is referring to.
*/
public DataType base_type {
get { return _base_type; }
set {
_base_type = value;
_base_type.parent_node = this;
}
}
private DataType _base_type;
public PointerType (DataType base_type, SourceReference? source_reference = null) {
this.base_type = base_type;
nullable = true;
this.source_reference = source_reference;
}
public override string to_qualified_string (Scope? scope) {
return base_type.to_qualified_string (scope) + "*";
}
public override DataType copy () {
return new PointerType (base_type.copy ());
}
public override bool compatible (DataType target_type) {
if (target_type is PointerType) {
unowned PointerType? tt = target_type as PointerType;
if (tt.base_type is VoidType || base_type is VoidType) {
return true;
}
/* dereference only if both types are references or not */
if (base_type.is_reference_type_or_type_parameter () != tt.base_type.is_reference_type_or_type_parameter ()) {
return false;
}
return base_type.compatible (tt.base_type);
}
if ((target_type.type_symbol != null && target_type.type_symbol.get_attribute ("PointerType") != null)) {
return true;
}
/* temporarily ignore type parameters */
if (target_type is GenericType) {
return true;
}
if (base_type.is_reference_type_or_type_parameter ()) {
// Object* is compatible with Object if Object is a reference type
return base_type.compatible (target_type);
}
if (CodeContext.get ().profile == Profile.GOBJECT && target_type.type_symbol != null && target_type.type_symbol.is_subtype_of (CodeContext.get ().analyzer.gvalue_type.type_symbol)) {
// allow implicit conversion to GValue
return true;
}
return false;
}
public override Symbol? get_member (string member_name) {
return null;
}
public override Symbol? get_pointer_member (string member_name) {
unowned Symbol? base_symbol = base_type.type_symbol;
if (base_symbol == null) {
return null;
}
return SemanticAnalyzer.symbol_lookup_inherited (base_symbol, member_name);
}
public override bool is_accessible (Symbol sym) {
return base_type.is_accessible (sym);
}
public override void accept_children (CodeVisitor visitor) {
base_type.accept (visitor);
}
public override bool stricter (DataType type2) {
if (type2 is PointerType) {
return compatible (type2);
}
if (base_type is VoidType) {
// void* can hold reference types
return type2 is ReferenceType;
}
return base_type.stricter (type2);
}
public override void replace_type (DataType old_type, DataType new_type) {
if (base_type == old_type) {
base_type = new_type;
}
}
public override bool is_disposable () {
return false;
}
public override DataType get_actual_type (DataType? derived_instance_type, List<DataType>? method_type_arguments, CodeNode? node_reference) {
PointerType result = (PointerType) this.copy ();
if (derived_instance_type == null && method_type_arguments == null) {
return result;
}
if (base_type is GenericType || base_type.has_type_arguments ()) {
result.base_type = result.base_type.get_actual_type (derived_instance_type, method_type_arguments, node_reference);
}
return result;
}
public override DataType? infer_type_argument (TypeParameter type_param, DataType value_type) {
unowned PointerType? pointer_type = value_type as PointerType;
if (pointer_type != null) {
return base_type.infer_type_argument (type_param, pointer_type.base_type);
}
return null;
}
public override bool check (CodeContext context) {
error = !base_type.check (context);
return !error;
}
}
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