ILSpy/ICSharpCode.Decompiler/IL/ILTypeExtensions.cs

// Copyright (c) 2014 Daniel Grunwald
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using Mono.Cecil;
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ICSharpCode.Decompiler.IL
{
	static class ILTypeExtensions
	{
		/*public static ImmutableArray<StackType> GetStackTypes(this TypeSignatureCollection typeSignatureCollection)
		{
			var result = new StackType[typeSignatureCollection.Count];
			int i = 0;
			foreach (var typeSig in typeSignatureCollection) {
				result[i++] = GetStackType(typeSig);
			}
			return ImmutableArray.Create(result);
		}*/

		public static int GetPopAmount(this MethodReference methodRef)
		{
			return methodRef.Parameters.Count + (methodRef.HasThis ? 1 : 0);
		}

		public static StackType GetStackType(this TypeReference typeRef)
		{
			typeRef = typeRef.SkipModifiers();
			TypeDefinition typeDef = typeRef.Resolve();
			if (typeDef != null && typeDef.IsEnum) {
				typeRef = typeDef.GetEnumUnderlyingType();
			}
			return typeRef.MetadataType.GetStackType();
		}

		public static TypeReference SkipModifiers(this TypeReference typeRef)
		{
			while (typeRef.IsOptionalModifier || typeRef.IsRequiredModifier)
				typeRef = ((IModifierType)typeRef).ElementType;
			return typeRef;
		}

		public static StackType GetStackType(this MetadataType typeCode)
		{
			switch (typeCode) {
				case MetadataType.Boolean:
				case MetadataType.Char:
				case MetadataType.SByte:
				case MetadataType.Byte:
				case MetadataType.Int16:
				case MetadataType.UInt16:
				case MetadataType.Int32:
				case MetadataType.UInt32:
					return StackType.I4;
				case MetadataType.Int64:
				case MetadataType.UInt64:
					return StackType.I8;
				case MetadataType.IntPtr:
				case MetadataType.UIntPtr:
				case MetadataType.Pointer:
					return StackType.I;
				case MetadataType.Single:
				case MetadataType.Double:
					return StackType.F;
				case MetadataType.ByReference:
					return StackType.Ref;
				case MetadataType.Void:
					return StackType.Void;
				default:
					return StackType.O;
			}
		}

		public static StackType GetStackType(this PrimitiveType primitiveType)
		{
			return ((MetadataType)primitiveType).GetStackType();
		}
	}
}