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 abstract class OpcodeJump : Opcode { 29 30 int disp; 31 32 internal OpcodeJump() : this(Int32.MinValue) 33 { 34 } 35 36 internal OpcodeJump(int disp) 37 { 38 this.disp = disp; 39 } 40 41 internal override int JumpDisp { 42 get { 43 return disp; 44 } 45 } 46 47 internal override void Run(CPU cpu) 48 { 49 cpu.ipOff += disp; 50 } 51 52 internal override void ResolveJump(int disp) 53 { 54 if (this.disp != Int32.MinValue) { 55 throw new Exception("Jump already resolved"); 56 } 57 this.disp = disp; 58 } 59 60 internal override void FixUp(CodeElement[] gcode, int off) 61 { 62 gcode[off].SetJumpTarget(gcode[off + 1 + disp]); 63 } 64 } 65