mcs/class/Microsoft.JScript/Microsoft.JScript/VariableDeclaration.cs

   1 //
   2 // VariableDeclaration.cs: The AST representation of a VariableDeclaration.
   3 //
   4 // Author:
   5 //      Cesar Octavio Lopez Nataren
   6 //
   7 // (C) 2003, Cesar Octavio Lopez Nataren, <cesar@ciencias.unam.mx>
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Text;
  33 using System.Reflection;
  34 using System.Reflection.Emit;
  35
  36 namespace Microsoft.JScript {
  37
  38         public class VariableDeclaration : AST {
  39
  40                 internal string id;
  41                 internal Type type;
  42                 internal string type_annot;
  43                 internal AST val;
  44
  45                 internal FieldInfo field_info;
  46                 internal LocalBuilder local_builder;
  47
  48                 internal VariableDeclaration (AST parent, string id, string t, AST init)
  49                 {
  50                         this.parent = parent;
  51                         this.id = id;
  52
  53                         if (t == null)
  54                                 this.type = typeof (System.Object);
  55                         else {
  56                                 this.type_annot = t;
  57                                 // FIXME: resolve the type annotations
  58                                 this.type = typeof (System.Object);
  59                         }
  60                         this.val = init;
  61                 }
  62
  63                 public override string ToString ()
  64                 {
  65                         StringBuilder sb = new StringBuilder ();
  66
  67                         sb.Append (id);
  68                         sb.Append (":" + type_annot);
  69                         sb.Append (" = ");
  70
  71                         if (val != null)
  72                                 sb.Append (val.ToString ());
  73
  74                         return sb.ToString ();
  75                 }
  76
  77                 internal override void Emit (EmitContext ec)
  78                 {
  79                         ILGenerator ig = ec.ig;
  80
  81                         if (parent == null) {
  82                                 FieldBuilder field_builder;
  83                                 TypeBuilder type  = ec.type_builder;
  84
  85                                 field_builder = type.DefineField (id, this.type, FieldAttributes.Public | FieldAttributes.Static);
  86                                 field_info = field_builder;
  87
  88                                 if (val != null) {
  89                                         val.Emit (ec);
  90                                         ig.Emit (OpCodes.Stsfld, field_builder);
  91                                 }
  92                         } else {
  93                                 local_builder = ig.DeclareLocal (type);
  94
  95                                 if (val != null) {
  96                                         val.Emit (ec);
  97                                         ig.Emit (OpCodes.Stloc, local_builder);
  98                                 }
  99                         }
 100                 }
 101
 102                 internal override bool Resolve (IdentificationTable context)
 103                 {
 104                         bool r = true;
 105                         if (val != null)
 106                                 r = val.Resolve (context);
 107                         context.Enter (id, this);
 108                         return r;
 109                 }
 110         }
 111 }