mcs/class/Microsoft.JScript/Microsoft.JScript/Try.cs

   1 //
   2 // Try.cs:
   3 //
   4 // Author: Cesar Octavio Lopez Nataren
   5 //
   6 // (C) 2003, 2004, Cesar Octavio Lopez Nataren
   7 //
   8
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using Microsoft.JScript.Vsa;
  32 using System.Reflection;
  33 using System.Reflection.Emit;
  34 using System.Collections;
  35
  36 namespace Microsoft.JScript {
  37
  38         public sealed class Try : AST {
  39
  40                 internal FieldBuilder field_info;
  41                 internal LocalBuilder local_builder;
  42
  43                 internal AST guarded_block;
  44                 internal ArrayList catch_blocks;
  45                 internal AST finally_block;
  46
  47
  48                 internal Try (AST guarded_block, ArrayList catch_block, AST finally_block, AST parent, int line_number)
  49                 {
  50                         this.parent = parent;
  51                         this.guarded_block = guarded_block;
  52                         this.catch_blocks = catch_block;
  53                         this.finally_block = finally_block;
  54                 }
  55
  56                 public static Object JScriptExceptionValue (object e, VsaEngine engine)
  57                 {
  58                         throw new NotImplementedException ();
  59                 }
  60
  61                 public static void PushHandlerScope (VsaEngine engine, string id, int scopeId)
  62                 {
  63                         throw new NotImplementedException ();
  64                 }
  65
  66                 internal override bool Resolve (IdentificationTable context)
  67                 {
  68                         bool r = true;
  69                         if (guarded_block != null)
  70                                 r &= guarded_block.Resolve (context);
  71
  72                         if (catch_blocks != null && catch_blocks.Count > 0) {
  73                                 foreach (Catch c in catch_blocks) {
  74                                         context.OpenBlock ();
  75                                         context.Enter (c.id, c);
  76                                         r &= c.Resolve (context);
  77                                         context.CloseBlock ();
  78                                 }
  79                         }
  80                         if (finally_block != null)
  81                                 r &= finally_block.Resolve (context);
  82                         return r;
  83                 }
  84
  85                 internal override void Emit (EmitContext ec)
  86                 {
  87                         ILGenerator ig = ec.ig;
  88
  89                         ig.BeginExceptionBlock ();
  90
  91                         if (guarded_block != null)
  92                                 guarded_block.Emit (ec);
  93
  94                         if (catch_blocks != null && catch_blocks.Count > 0) {
  95                                 foreach (Catch c in catch_blocks)
  96                                         c.Emit (ec);
  97                         }
  98                         if (finally_block != null) {
  99                                 ig.BeginFinallyBlock ();
 100                                 finally_block.Emit (ec);
 101                         }
 102                         ig.EndExceptionBlock ();
 103                 }
 104         }
 105 }