ilasm/codegen/FieldTable.cs

   1 //
   2 // Mono.ILASM.FieldTable.cs
   3 //
   4 // Author(s):
   5 //  Jackson Harper (Jackson@LatitudeGeo.com)
   6 //
   7 // (C) 2003 Jackson Harper, All rights reserved
   8 //
   9
  10 using PEAPI;
  11 using System;
  12 using System.Text;
  13 using System.Collections;
  14
  15 namespace Mono.ILASM {
  16
  17         public class FieldTable {
  18
  19                 private class FieldTableItem {
  20
  21                         private static readonly int DefinedFlag = 2;
  22
  23                         private int flags;
  24
  25                         public ArrayList LocationList;
  26                         public FieldDef Field;
  27
  28                         public FieldTableItem (FieldDef field, Location location)
  29                         {
  30                                 flags = 0;
  31                                 Field = field;
  32                                 LocationList = new ArrayList ();
  33                                 LocationList.Add (location);
  34                         }
  35
  36                         public bool Defined {
  37                                 get { return ((flags & DefinedFlag) != 0); }
  38                                 set {
  39                                         if (value)
  40                                                 flags |= DefinedFlag;
  41                                         else
  42                                                 flags ^= DefinedFlag;
  43                                 }
  44                         }
  45                 }
  46
  47                 protected Hashtable table;
  48                 protected ClassDef parent_class;
  49
  50                 public FieldTable (ClassDef parent_class)
  51                 {
  52                         this.parent_class = parent_class;
  53                         table = new Hashtable ();
  54                 }
  55
  56                 public Field GetReference (TypeRef type, string name, Location location)
  57                 {
  58                         FieldTableItem item = table[name] as FieldTableItem;
  59
  60                         if (item != null) {
  61                                 item.LocationList.Add (location);
  62                                 return item.Field;
  63                         }
  64
  65                         FieldDef field = parent_class.AddField (name, type.Type);
  66                         AddReferenced (name, field, location);
  67
  68                         return field;
  69                 }
  70
  71                 public FieldDef AddDefinition (FieldAttr field_attr, string name,
  72                         TypeRef type, Location location)
  73                 {
  74                         FieldTableItem item = (FieldTableItem) table[name];
  75
  76                         if (item == null) {
  77                                 FieldDef field = parent_class.AddField (field_attr, name, type.Type);
  78                                 AddDefined (name, field, location);
  79                                 return field;
  80                         }
  81
  82                         item.Field.AddFieldAttr (field_attr);
  83                         item.Defined = true;
  84
  85                         return item.Field;
  86                 }
  87
  88                 public bool CheckDefined ()
  89                 {
  90                         foreach (DictionaryEntry dic_entry in table) {
  91                                 FieldTableItem table_item = (FieldTableItem) dic_entry.Value;
  92                                 if (table_item.Defined)
  93                                         continue;
  94                                 Report.Error (String.Format ("Field: {0} is not defined.", dic_entry.Key));
  95                         }
  96                         return true;
  97                 }
  98
  99                 protected void AddDefined (string signature, FieldDef field, Location location)
 100                 {
 101                         if (table.Contains (signature))
 102                                 return;
 103
 104                         FieldTableItem item = new FieldTableItem (field, location);
 105                         item.Defined = true;
 106
 107                         table[signature] = item;
 108                 }
 109
 110                 protected void AddReferenced (string signature, FieldDef field, Location location)
 111                 {
 112                         FieldTableItem item = new FieldTableItem (field, location);
 113
 114                         table[signature] = item;
 115                 }
 116
 117                 /// <summary>
 118                 ///  If a field is allready defined throw an Error
 119                 /// </summary>
 120                 protected void CheckExists (string signature)
 121                 {
 122                         FieldTableItem item = table[signature] as FieldTableItem;
 123
 124                         if ((item != null) && (item.Defined))
 125                                 Report.Error ("Field: " + signature + " defined in multiple locations.");
 126                 }
 127         }
 128
 129 }
 130