vala/valapointertype.vala

   1 /* valapointertype.vala
   2  *
   3  * Copyright (C) 2007-2009  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 using GLib;
  24
  25 /**
  26  * A pointer type.
  27  */
  28 public class Vala.PointerType : DataType {
  29         /**
  30          * The base type the pointer is referring to.
  31          */
  32         public DataType base_type {
  33                 get { return _base_type; }
  34                 set {
  35                         _base_type = value;
  36                         _base_type.parent_node = this;
  37                 }
  38         }
  39
  40         private DataType _base_type;
  41
  42         public PointerType (DataType base_type, SourceReference? source_reference = null) {
  43                 this.base_type = base_type;
  44                 nullable = true;
  45                 this.source_reference = source_reference;
  46         }
  47
  48         public override string to_qualified_string (Scope? scope) {
  49                 return base_type.to_qualified_string (scope) + "*";
  50         }
  51
  52         public override string? get_cname () {
  53                 if (base_type.data_type != null && base_type.data_type.is_reference_type ()) {
  54                         return base_type.get_cname ();
  55                 } else {
  56                         return base_type.get_cname () + "*";
  57                 }
  58         }
  59
  60         public override DataType copy () {
  61                 return new PointerType (base_type.copy ());
  62         }
  63
  64         public override bool compatible (DataType target_type) {
  65                 if (target_type is PointerType) {
  66                         var tt = target_type as PointerType;
  67
  68                         if (tt.base_type is VoidType || base_type is VoidType) {
  69                                 return true;
  70                         }
  71
  72                         /* dereference only if both types are references or not */
  73                         if (base_type.is_reference_type_or_type_parameter () != tt.base_type.is_reference_type_or_type_parameter ()) {
  74                                 return false;
  75                         }
  76
  77                         return base_type.compatible (tt.base_type);
  78                 }
  79
  80                 if ((target_type.data_type != null && target_type.data_type.get_attribute ("PointerType") != null)) {
  81                         return true;
  82                 }
  83
  84                 /* temporarily ignore type parameters */
  85                 if (target_type.type_parameter != null) {
  86                         return true;
  87                 }
  88
  89                 if (base_type.is_reference_type_or_type_parameter ()) {
  90                         // Object* is compatible with Object if Object is a reference type
  91                         return base_type.compatible (target_type);
  92                 }
  93
  94                 return false;
  95         }
  96
  97         public override Symbol? get_member (string member_name) {
  98                 if (CodeContext.get ().profile != Profile.DOVA) {
  99                         return null;
 100                 }
 101
 102                 Symbol base_symbol = base_type.data_type;
 103
 104                 if (base_symbol == null) {
 105                         return null;
 106                 }
 107
 108                 return SemanticAnalyzer.symbol_lookup_inherited (base_symbol, member_name);
 109         }
 110
 111         public override Symbol? get_pointer_member (string member_name) {
 112                 Symbol base_symbol = base_type.data_type;
 113
 114                 if (base_symbol == null) {
 115                         return null;
 116                 }
 117
 118                 return SemanticAnalyzer.symbol_lookup_inherited (base_symbol, member_name);
 119         }
 120
 121         public override bool is_accessible (Symbol sym) {
 122                 return base_type.is_accessible (sym);
 123         }
 124
 125         public override string? get_type_id () {
 126                 return "G_TYPE_POINTER";
 127         }
 128
 129         public override void accept_children (CodeVisitor visitor) {
 130                 base_type.accept (visitor);
 131         }
 132
 133         public override void replace_type (DataType old_type, DataType new_type) {
 134                 if (base_type == old_type) {
 135                         base_type = new_type;
 136                 }
 137         }
 138
 139         public override bool is_disposable () {
 140                 return false;
 141         }
 142
 143         public override bool check (CodeContext context) {
 144                 error = !base_type.check (context);
 145                 return !error;
 146         }
 147 }