_ Git - BearSSL/blob - T0/OpcodeJumpIf.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 OpcodeJumpIf : OpcodeJump {
  29
  30         internal OpcodeJumpIf() : base()
  31         {
  32         }
  33
  34         internal OpcodeJumpIf(int disp) : base(disp)
  35         {
  36         }
  37
  38         internal override void Run(CPU cpu)
  39         {
  40                 TValue v = cpu.Pop();
  41                 if (v.Bool) {
  42                         base.Run(cpu);
  43                 }
  44         }
  45
  46         internal override int StackAction {
  47                 get {
  48                         return -1;
  49                 }
  50         }
  51
  52         internal override CodeElement ToCodeElement()
  53         {
  54                 return new CodeElementJump(5);
  55         }
  56
  57         public override string ToString()
  58         {
  59                 if (JumpDisp == Int32.MinValue) {
  60                         return "jumpif UNRESOLVED";
  61                 } else {
  62                         return "jumpif disp=" + JumpDisp;
  63                 }
  64         }
  65 }