98 lines
2.4 KiB
C#
98 lines
2.4 KiB
C#
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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using System;
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class CodeElementJump : CodeElement {
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uint jumpType;
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CodeElement target;
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internal CodeElementJump(uint jumpType)
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{
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this.jumpType = jumpType;
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}
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/* obsolete
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internal override int Length {
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get {
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int len = Encode7EUnsigned(jumpType, null);
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int joff = JumpOff;
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if (joff == Int32.MinValue) {
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len ++;
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} else {
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len += Encode7ESigned(joff, null);
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}
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return len;
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}
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}
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*/
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internal override int GetLength(bool oneByteCode)
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{
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int len = oneByteCode ? 1 : Encode7EUnsigned(jumpType, null);
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int joff = JumpOff;
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if (joff == Int32.MinValue) {
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len ++;
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} else {
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len += Encode7ESigned(joff, null);
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}
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return len;
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}
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internal override void SetJumpTarget(CodeElement target)
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{
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this.target = target;
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}
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int JumpOff {
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get {
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if (target == null || Address < 0 || target.Address < 0)
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{
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return Int32.MinValue;
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} else {
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return target.Address - (Address + LastLength);
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}
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}
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}
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internal override int Encode(BlobWriter bw, bool oneByteCode)
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{
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if (bw == null) {
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return GetLength(oneByteCode);
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}
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int len;
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if (oneByteCode) {
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len = EncodeOneByte(jumpType, bw);
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} else {
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len = Encode7EUnsigned(jumpType, bw);
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}
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int joff = JumpOff;
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if (joff == Int32.MinValue) {
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throw new Exception("Unresolved addresses");
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}
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return len + Encode7ESigned(joff, bw);
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}
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}
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