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 OpcodeConst : Opcode { 29 30 TValue val; 31 32 internal OpcodeConst(TValue val) 33 { 34 this.val = val; 35 } 36 37 internal override void Run(CPU cpu) 38 { 39 cpu.Push(val); 40 } 41 42 internal override Word GetReference(T0Comp ctx) 43 { 44 TPointerXT xt = val.ptr as TPointerXT; 45 if (xt == null) { 46 return null; 47 } 48 xt.Resolve(ctx); 49 return xt.Target; 50 } 51 52 internal override ConstData GetDataBlock(T0Comp ctx) 53 { 54 TPointerBlob bp = val.ptr as TPointerBlob; 55 return bp == null ? null : bp.Blob; 56 } 57 58 internal override CodeElement ToCodeElement() 59 { 60 if (val.ptr == null) { 61 return new CodeElementUIntInt(1, val.Int); 62 } 63 TPointerXT xt = val.ptr as TPointerXT; 64 if (xt != null) { 65 if (val.x != 0) { 66 throw new Exception( 67 "Cannot compile XT: non-zero offset"); 68 } 69 return new CodeElementUIntInt(1, xt.Target.Slot); 70 } 71 TPointerBlob bp = val.ptr as TPointerBlob; 72 if (bp != null) { 73 return new CodeElementUIntInt(1, 74 val.x + bp.Blob.Address); 75 } 76 TPointerExpr cx = val.ptr as TPointerExpr; 77 if (cx != null) { 78 return new CodeElementUIntExpr(1, cx, val.x); 79 } 80 throw new Exception(String.Format( 81 "Cannot embed constant (type = {0})", 82 val.ptr.GetType().FullName)); 83 } 84 85 internal override int StackAction { 86 get { 87 return 1; 88 } 89 } 90 91 public override string ToString() 92 { 93 return "const " + val.ToString(); 94 } 95 } 96