vala/valadeletestatement.vala

   1 /* valadeletestatement.vala
   2  *
   3  * Copyright (C) 2008-2010  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23 /**
  24  * Represents a delete statement e.g. "delete a".
  25  */
  26 public class Vala.DeleteStatement : CodeNode, Statement {
  27         /**
  28          * Expression representing the instance to be freed.
  29          */
  30         public Expression expression { get; set; }
  31
  32         public DeleteStatement (Expression expression, SourceReference? source_reference = null) {
  33                 this.expression = expression;
  34                 this.source_reference = source_reference;
  35         }
  36
  37         public override void accept (CodeVisitor visitor) {
  38                 visitor.visit_delete_statement (this);
  39         }
  40
  41         public override void accept_children (CodeVisitor visitor) {
  42                 expression.accept (visitor);
  43         }
  44
  45         public override bool check (CodeContext context) {
  46                 if (checked) {
  47                         return !error;
  48                 }
  49
  50                 checked = true;
  51
  52                 if (!expression.check (context)) {
  53                         // if there was an error in the inner expression, skip this check
  54                         return false;
  55                 }
  56
  57                 if (!(expression.value_type is PointerType)) {
  58                         error = true;
  59                         Report.error (source_reference, "delete operator not supported for `%s'".printf (expression.value_type.to_string ()));
  60                 }
  61
  62                 return !error;
  63         }
  64
  65         public override void emit (CodeGenerator codegen) {
  66                 expression.emit (codegen);
  67
  68                 codegen.visit_delete_statement (this);
  69         }
  70 }