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 WordData : Word { 29 30 ConstData blob; 31 string baseBlobName; 32 int offset; 33 bool ongoingResolution; 34 35 internal WordData(T0Comp owner, string name, 36 ConstData blob, int offset) 37 : base(owner, name) 38 { 39 this.blob = blob; 40 this.offset = offset; 41 StackEffect = new SType(0, 1); 42 } 43 44 internal WordData(T0Comp owner, string name, 45 string baseBlobName, int offset) 46 : base(owner, name) 47 { 48 this.baseBlobName = baseBlobName; 49 this.offset = offset; 50 StackEffect = new SType(0, 1); 51 } 52 53 internal override void Resolve() 54 { 55 if (blob != null) { 56 return; 57 } 58 if (ongoingResolution) { 59 throw new Exception(String.Format( 60 "circular reference in blobs ({0})", Name)); 61 } 62 ongoingResolution = true; 63 WordData wd = TC.Lookup(baseBlobName) as WordData; 64 if (wd == null) { 65 throw new Exception(String.Format( 66 "data word '{0}' based on non-data word '{1}'", 67 Name, baseBlobName)); 68 } 69 wd.Resolve(); 70 blob = wd.blob; 71 offset += wd.offset; 72 ongoingResolution = false; 73 } 74 75 internal override void Run(CPU cpu) 76 { 77 Resolve(); 78 cpu.Push(new TValue(offset, new TPointerBlob(blob))); 79 } 80 81 internal override List<ConstData> GetDataBlocks() 82 { 83 Resolve(); 84 List<ConstData> r = new List<ConstData>(); 85 r.Add(blob); 86 return r; 87 } 88 89 internal override void GenerateCodeElements(List<CodeElement> dst) 90 { 91 Resolve(); 92 dst.Add(new CodeElementUInt(0)); 93 dst.Add(new CodeElementUIntInt(1, blob.Address + offset)); 94 dst.Add(new CodeElementUInt(0)); 95 } 96 } 97