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/* valalockstatement.vala
*
* Copyright (C) 2006-2007 Raffaele Sandrini, 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:
* Raffaele Sandrini <raffaele@sandrini.ch>
*/
using GLib;
/**
* Represents a lock statement e.g. "lock (a) { f(a) }".
*/
public class Vala.LockStatement : CodeNode, Statement {
/**
* Expression representing the resource to be locked.
*/
public Expression resource { get; set; }
/**
* The statement during its execution the resource is locked.
*/
public Block body { get; set; }
public LockStatement (Expression resource, Block body, SourceReference? source_reference = null) {
this.body = body;
this.source_reference = source_reference;
this.resource = resource;
}
public override void accept (CodeVisitor visitor) {
resource.accept (visitor);
body.accept (visitor);
visitor.visit_lock_statement (this);
}
public override bool check (SemanticAnalyzer analyzer) {
if (checked) {
return !error;
}
checked = true;
resource.check (analyzer);
body.check (analyzer);
/* 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 != analyzer.current_class) {
error = true;
resource.error = true;
Report.error (resource.source_reference, "Only members of the current class are lockable");
}
((Lockable) resource.symbol_reference).set_lock_used (true);
return !error;
}
}
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