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/* valaunlockstatement.vala
*
* Copyright (C) 2009-2010 Jürg Billeter
* Copyright (C) 2009 Jiří Zárevúcky
*
* 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:
* Jiří Zárevúcky <zarevucky.jiri@gmail.com>
*/
/**
* Represents an unlock statement.
*
* {{{ unlock (foo); }}}
*/
public class Vala.UnlockStatement : CodeNode, Statement {
/**
* Expression representing the resource to be unlocked.
*/
public Expression resource {
get { return _resource; }
private set {
_resource = value;
_resource.parent_node = this;
}
}
private Expression _resource;
public UnlockStatement (Expression resource, SourceReference? source_reference = null) {
this.source_reference = source_reference;
this.resource = resource;
}
public override void accept (CodeVisitor visitor) {
resource.accept (visitor);
visitor.visit_unlock_statement (this);
}
public override void replace_expression (Expression old_node, Expression new_node) {
if (resource == old_node) {
resource = new_node;
}
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
resource.check (context);
/* resource must be a member access and denote a Lockable */
if (!(resource is MemberAccess && resource.symbol_reference is Lockable)) {
error = true;
resource.error = true;
Report.error (resource.source_reference, "Expression is either not a member access or does not denote a lockable member");
return false;
}
/* parent symbol must be the current class */
if (resource.symbol_reference.parent_symbol != context.analyzer.current_class) {
error = true;
resource.error = true;
Report.error (resource.source_reference, "Only members of the current class are lockable");
return false;
}
/* parent class must not be compact */
if (context.analyzer.current_class.is_compact) {
error = true;
resource.error = true;
Report.error (resource.source_reference, "Only members of the non-compact classes are lockable");
return false;
}
((Lockable) resource.symbol_reference).lock_used = true;
return !error;
}
public override void emit (CodeGenerator codegen) {
resource.emit (codegen);
codegen.visit_unlock_statement (this);
}
}
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