_ Git - BearSSL/blob - T0/OpcodeCall.cs

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 using System;
  26 using System.Collections.Generic;
  27
  28 class OpcodeCall : Opcode {
  29
  30         Word target;
  31
  32         internal OpcodeCall() : this(null)
  33         {
  34         }
  35
  36         internal OpcodeCall(Word target)
  37         {
  38                 this.target = target;
  39         }
  40
  41         internal override void ResolveTarget(Word target)
  42         {
  43                 if (this.target != null) {
  44                         throw new Exception("Opcode already resolved");
  45                 }
  46                 this.target = target;
  47         }
  48
  49         internal override void Run(CPU cpu)
  50         {
  51                 target.Run(cpu);
  52         }
  53
  54         internal override Word GetReference(T0Comp ctx)
  55         {
  56                 if (target == null) {
  57                         throw new Exception("Unresolved call target");
  58                 }
  59                 return target;
  60         }
  61
  62         internal override CodeElement ToCodeElement()
  63         {
  64                 return new CodeElementUInt((uint)target.Slot);
  65         }
  66
  67         public override string ToString()
  68         {
  69                 return "call " + (target == null ? "UNRESOLVED" : target.Name);
  70         }
  71 }