Line data    Source code

       1              : /* valaunlockstatement.vala
       2              :  *
       3              :  * Copyright (C) 2009-2010  Jürg Billeter
       4              :  * Copyright (C) 2009  Jiří Zárevúcky
       5              :  *
       6              :  * This library is free software; you can redistribute it and/or
       7              :  * modify it under the terms of the GNU Lesser General Public
       8              :  * License as published by the Free Software Foundation; either
       9              :  * version 2.1 of the License, or (at your option) any later version.
      10              : 
      11              :  * This library is distributed in the hope that it will be useful,
      12              :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13              :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14              :  * Lesser General Public License for more details.
      15              : 
      16              :  * You should have received a copy of the GNU Lesser General Public
      17              :  * License along with this library; if not, write to the Free Software
      18              :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
      19              :  *
      20              :  * Author:
      21              :  *      Jiří Zárevúcky <zarevucky.jiri@gmail.com>
      22              :  */
      23              : 
      24              : /**
      25              :  * Represents an unlock statement.
      26              :  *
      27              :  * {{{ unlock (foo); }}}
      28              :  */
      29           47 : public class Vala.UnlockStatement : CodeNode, Statement {
      30              :         /**
      31              :          * Expression representing the resource to be unlocked.
      32              :          */
      33              :         public Expression resource {
      34          228 :                 get { return _resource; }
      35           29 :                 private set {
      36           29 :                         _resource = value;
      37           29 :                         _resource.parent_node = this;
      38              :                 }
      39              :         }
      40              : 
      41           29 :         private Expression _resource;
      42              : 
      43           87 :         public UnlockStatement (Expression resource, SourceReference? source_reference = null) {
      44           29 :                 this.source_reference = source_reference;
      45           29 :                 this.resource = resource;
      46              :         }
      47              : 
      48           29 :         public override void accept (CodeVisitor visitor) {
      49           29 :                 resource.accept (visitor);
      50           29 :                 visitor.visit_unlock_statement (this);
      51              :         }
      52              : 
      53            0 :         public override void replace_expression (Expression old_node, Expression new_node) {
      54            0 :                 if (resource == old_node) {
      55            0 :                         resource = new_node;
      56              :                 }
      57              :         }
      58              : 
      59           29 :         public override bool check (CodeContext context) {
      60           29 :                 if (checked) {
      61            0 :                         return !error;
      62              :                 }
      63              : 
      64           29 :                 checked = true;
      65              : 
      66           29 :                 resource.check (context);
      67              : 
      68              :                 /* resource must be a member access and denote a Lockable */
      69           29 :                 if (!(resource is MemberAccess && resource.symbol_reference is Lockable)) {
      70            1 :                         error = true;
      71            1 :                         resource.error = true;
      72            1 :                         Report.error (resource.source_reference, "Expression is either not a member access or does not denote a lockable member");
      73            1 :                         return false;
      74              :                 }
      75              : 
      76              :                 /* parent symbol must be the current class */
      77           28 :                 if (resource.symbol_reference.parent_symbol != context.analyzer.current_class) {
      78            1 :                         error = true;
      79            1 :                         resource.error = true;
      80            1 :                         Report.error (resource.source_reference, "Only members of the current class are lockable");
      81            1 :                         return false;
      82              :                 }
      83              : 
      84              :                 /* parent class must not be compact */
      85           27 :                 if (context.analyzer.current_class.is_compact) {
      86            1 :                         error = true;
      87            1 :                         resource.error = true;
      88            1 :                         Report.error (resource.source_reference, "Only members of the non-compact classes are lockable");
      89            1 :                         return false;
      90              :                 }
      91              : 
      92           26 :                 ((Lockable) resource.symbol_reference).lock_used = true;
      93              : 
      94           26 :                 return !error;
      95              :         }
      96              : 
      97           26 :         public override void emit (CodeGenerator codegen) {
      98           26 :                 resource.emit (codegen);
      99           26 :                 codegen.visit_unlock_statement (this);
     100              :         }
     101              : }