1*0957b409SSimon J. Gerraty /* 2*0957b409SSimon J. Gerraty * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> 3*0957b409SSimon J. Gerraty * 4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining 5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the 6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including 7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish, 8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to 9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to 10*0957b409SSimon J. Gerraty * the following conditions: 11*0957b409SSimon J. Gerraty * 12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be 13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software. 14*0957b409SSimon J. Gerraty * 15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22*0957b409SSimon J. Gerraty * SOFTWARE. 23*0957b409SSimon J. Gerraty */ 24*0957b409SSimon J. Gerraty 25*0957b409SSimon J. Gerraty using System; 26*0957b409SSimon J. Gerraty 27*0957b409SSimon J. Gerraty class CodeElementJump : CodeElement { 28*0957b409SSimon J. Gerraty 29*0957b409SSimon J. Gerraty uint jumpType; 30*0957b409SSimon J. Gerraty CodeElement target; 31*0957b409SSimon J. Gerraty CodeElementJump(uint jumpType)32*0957b409SSimon J. Gerraty internal CodeElementJump(uint jumpType) 33*0957b409SSimon J. Gerraty { 34*0957b409SSimon J. Gerraty this.jumpType = jumpType; 35*0957b409SSimon J. Gerraty } 36*0957b409SSimon J. Gerraty 37*0957b409SSimon J. Gerraty /* obsolete 38*0957b409SSimon J. Gerraty internal override int Length { 39*0957b409SSimon J. Gerraty get { 40*0957b409SSimon J. Gerraty int len = Encode7EUnsigned(jumpType, null); 41*0957b409SSimon J. Gerraty int joff = JumpOff; 42*0957b409SSimon J. Gerraty if (joff == Int32.MinValue) { 43*0957b409SSimon J. Gerraty len ++; 44*0957b409SSimon J. Gerraty } else { 45*0957b409SSimon J. Gerraty len += Encode7ESigned(joff, null); 46*0957b409SSimon J. Gerraty } 47*0957b409SSimon J. Gerraty return len; 48*0957b409SSimon J. Gerraty } 49*0957b409SSimon J. Gerraty } 50*0957b409SSimon J. Gerraty */ 51*0957b409SSimon J. Gerraty GetLength(bool oneByteCode)52*0957b409SSimon J. Gerraty internal override int GetLength(bool oneByteCode) 53*0957b409SSimon J. Gerraty { 54*0957b409SSimon J. Gerraty int len = oneByteCode ? 1 : Encode7EUnsigned(jumpType, null); 55*0957b409SSimon J. Gerraty int joff = JumpOff; 56*0957b409SSimon J. Gerraty if (joff == Int32.MinValue) { 57*0957b409SSimon J. Gerraty len ++; 58*0957b409SSimon J. Gerraty } else { 59*0957b409SSimon J. Gerraty len += Encode7ESigned(joff, null); 60*0957b409SSimon J. Gerraty } 61*0957b409SSimon J. Gerraty return len; 62*0957b409SSimon J. Gerraty } 63*0957b409SSimon J. Gerraty SetJumpTarget(CodeElement target)64*0957b409SSimon J. Gerraty internal override void SetJumpTarget(CodeElement target) 65*0957b409SSimon J. Gerraty { 66*0957b409SSimon J. Gerraty this.target = target; 67*0957b409SSimon J. Gerraty } 68*0957b409SSimon J. Gerraty 69*0957b409SSimon J. Gerraty int JumpOff { 70*0957b409SSimon J. Gerraty get { 71*0957b409SSimon J. Gerraty if (target == null || Address < 0 || target.Address < 0) 72*0957b409SSimon J. Gerraty { 73*0957b409SSimon J. Gerraty return Int32.MinValue; 74*0957b409SSimon J. Gerraty } else { 75*0957b409SSimon J. Gerraty return target.Address - (Address + LastLength); 76*0957b409SSimon J. Gerraty } 77*0957b409SSimon J. Gerraty } 78*0957b409SSimon J. Gerraty } 79*0957b409SSimon J. Gerraty Encode(BlobWriter bw, bool oneByteCode)80*0957b409SSimon J. Gerraty internal override int Encode(BlobWriter bw, bool oneByteCode) 81*0957b409SSimon J. Gerraty { 82*0957b409SSimon J. Gerraty if (bw == null) { 83*0957b409SSimon J. Gerraty return GetLength(oneByteCode); 84*0957b409SSimon J. Gerraty } 85*0957b409SSimon J. Gerraty int len; 86*0957b409SSimon J. Gerraty if (oneByteCode) { 87*0957b409SSimon J. Gerraty len = EncodeOneByte(jumpType, bw); 88*0957b409SSimon J. Gerraty } else { 89*0957b409SSimon J. Gerraty len = Encode7EUnsigned(jumpType, bw); 90*0957b409SSimon J. Gerraty } 91*0957b409SSimon J. Gerraty int joff = JumpOff; 92*0957b409SSimon J. Gerraty if (joff == Int32.MinValue) { 93*0957b409SSimon J. Gerraty throw new Exception("Unresolved addresses"); 94*0957b409SSimon J. Gerraty } 95*0957b409SSimon J. Gerraty return len + Encode7ESigned(joff, bw); 96*0957b409SSimon J. Gerraty } 97*0957b409SSimon J. Gerraty } 98