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99 lines
3.5 KiB
99 lines
3.5 KiB
// Copyright (c) 2018 Daniel Grunwald
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Text;
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using ICSharpCode.Decompiler.TypeSystem;
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namespace ICSharpCode.Decompiler.IL
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{
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class TupleTransform
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{
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/// <summary>
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/// Matches an 'ldflda' instruction accessing a tuple element.
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///
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/// E.g. matches:
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/// <c>ldflda Item1(ldflda Rest(target))</c>
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/// </summary>
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public static bool MatchTupleFieldAccess(LdFlda inst, out IType tupleType, out ILInstruction target, out int position)
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{
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tupleType = inst.Field.DeclaringType;
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target = inst.Target;
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if (!inst.Field.Name.StartsWith("Item", StringComparison.Ordinal))
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{
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position = 0;
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return false;
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}
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if (!int.TryParse(inst.Field.Name.Substring(4), out position))
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return false;
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if (!TupleType.IsTupleCompatible(tupleType, out _))
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return false;
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while (target is LdFlda ldflda && ldflda.Field.Name == "Rest" && TupleType.IsTupleCompatible(ldflda.Field.DeclaringType, out _))
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{
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tupleType = ldflda.Field.DeclaringType;
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target = ldflda.Target;
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position += TupleType.RestPosition - 1;
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}
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return true;
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}
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/// <summary>
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/// Matches 'newobj TupleType(...)'.
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/// Takes care of flattening long tuples.
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/// </summary>
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public static bool MatchTupleConstruction(NewObj newobj, out ILInstruction[] arguments)
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{
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arguments = null;
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if (newobj == null)
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return false;
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if (!TupleType.IsTupleCompatible(newobj.Method.DeclaringType, out int elementCount))
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return false;
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arguments = new ILInstruction[elementCount];
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int outIndex = 0;
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while (elementCount >= TupleType.RestPosition)
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{
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if (newobj.Arguments.Count != TupleType.RestPosition)
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return false;
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for (int pos = 1; pos < TupleType.RestPosition; pos++)
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{
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arguments[outIndex++] = newobj.Arguments[pos - 1];
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}
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elementCount -= TupleType.RestPosition - 1;
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Debug.Assert(outIndex + elementCount == arguments.Length);
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newobj = newobj.Arguments.Last() as NewObj;
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if (newobj == null)
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return false;
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if (!TupleType.IsTupleCompatible(newobj.Method.DeclaringType, out int restElementCount))
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return false;
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if (restElementCount != elementCount)
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return false;
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}
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Debug.Assert(outIndex + elementCount == arguments.Length);
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if (newobj.Arguments.Count != elementCount)
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return false;
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for (int i = 0; i < elementCount; i++)
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{
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arguments[outIndex++] = newobj.Arguments[i];
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}
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return true;
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}
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}
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}
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