Fixed decompiling "new byte[length]" where length is a long.

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -525,6 +525,10 @@ namespace ICSharpCode.Decompiler.Ast
 				case ILCode.Conv_Ovf_U2_Un:
 				case ILCode.Conv_Ovf_U4_Un:
 				case ILCode.Conv_Ovf_U8_Un:
+				case ILCode.Conv_Ovf_I:
+				case ILCode.Conv_Ovf_U:
+				case ILCode.Conv_Ovf_I_Un:
+				case ILCode.Conv_Ovf_U_Un:
 					{
 						// conversion was handled by Convert() function using the info from type analysis
 						CastExpression cast = arg1 as CastExpression;
@@ -533,11 +537,8 @@ namespace ICSharpCode.Decompiler.Ast
 						}
 						return arg1;
 					}
-					case ILCode.Conv_Ovf_I:     return arg1.CastTo(new SimpleType("IntPtr")); // TODO
-					case ILCode.Conv_Ovf_U:     return arg1.CastTo(new SimpleType("UIntPtr"));
-					case ILCode.Conv_Ovf_I_Un:  return arg1.CastTo(new SimpleType("IntPtr"));
-					case ILCode.Conv_Ovf_U_Un:  return arg1.CastTo(new SimpleType("UIntPtr"));
-					case ILCode.Castclass:      return arg1.CastTo(operandAsTypeRef);
+				case ILCode.Castclass:
+					return arg1.CastTo(operandAsTypeRef);
 				case ILCode.Unbox_Any:
 					// unboxing does not require a cast if the argument was an isinst instruction
 					if (arg1 is AsExpression && byteCode.Arguments[0].Code == ILCode.Isinst && TypeAnalysis.IsSameType(operand as TypeReference, byteCode.Arguments[0].Operand as TypeReference))

ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs

@@ -44,7 +44,7 @@ namespace ICSharpCode.Decompiler.ILAst
 		JoinBasicBlocks,
 		SimplifyLogicNot,
 		SimplifyShiftOperators,
-		TransformDecimalCtorToConstant,
+		TypeConversionSimplifications,
 		SimplifyLdObjAndStObj,
 		SimplifyCustomShortCircuit,
 		SimplifyLiftedOperators,
@@ -143,9 +143,8 @@ namespace ICSharpCode.Decompiler.ILAst
 					if (abortBeforeStep == ILAstOptimizationStep.SimplifyShiftOperators) return;
 					modified |= block.RunOptimization(SimplifyShiftOperators);
 
-					if (abortBeforeStep == ILAstOptimizationStep.TransformDecimalCtorToConstant) return;
-					modified |= block.RunOptimization(TransformDecimalCtorToConstant);
-					modified |= block.RunOptimization(SimplifyLdcI4ConvI8);
+					if (abortBeforeStep == ILAstOptimizationStep.TypeConversionSimplifications) return;
+					modified |= block.RunOptimization(TypeConversionSimplifications);
 					
 					if (abortBeforeStep == ILAstOptimizationStep.SimplifyLdObjAndStObj) return;
 					modified |= block.RunOptimization(SimplifyLdObjAndStObj);

ICSharpCode.Decompiler/ILAst/PeepholeTransform.cs

@@ -28,8 +28,20 @@ namespace ICSharpCode.Decompiler.ILAst
 {
 	public partial class ILAstOptimizer
 	{
-		#region TransformDecimalCtorToConstant
-		static bool TransformDecimalCtorToConstant(List<ILNode> body, ILExpression expr, int pos)
+		#region TypeConversionSimplifications
+		static bool TypeConversionSimplifications(List<ILNode> body, ILExpression expr, int pos)
+		{
+			bool modified = false;
+			modified |= TransformDecimalCtorToConstant(expr);
+			modified |= SimplifyLdcI4ConvI8(expr);
+			modified |= RemoveConvIFromArrayCreation(expr);
+			foreach(ILExpression arg in expr.Arguments) {
+				modified |= TypeConversionSimplifications(null, arg, -1);
+			}
+			return modified;
+		}
+		
+		static bool TransformDecimalCtorToConstant(ILExpression expr)
 		{
 			MethodReference r;
 			List<ILExpression> args;
@@ -62,11 +74,34 @@ namespace ICSharpCode.Decompiler.ILAst
 					}
 				}
 			}
-			bool modified = false;
-			foreach(ILExpression arg in expr.Arguments) {
-				modified |= TransformDecimalCtorToConstant(null, arg, -1);
+			return false;
+		}
+		
+		static bool SimplifyLdcI4ConvI8(ILExpression expr)
+		{
+			ILExpression ldc;
+			int val;
+			if (expr.Match(ILCode.Conv_I8, out ldc) && ldc.Match(ILCode.Ldc_I4, out val)) {
+				expr.Code = ILCode.Ldc_I8;
+				expr.Operand = (long)val;
+				expr.Arguments.Clear();
+				return true;
 			}
-			return modified;
+			return false;
+		}
+		
+		static bool RemoveConvIFromArrayCreation(ILExpression expr)
+		{
+			TypeReference typeRef;
+			ILExpression length;
+			ILExpression input;
+			if (expr.Match(ILCode.Newarr, out typeRef, out length)) {
+				if (length.Match(ILCode.Conv_Ovf_I, out input) || length.Match(ILCode.Conv_I, out input)) {
+					expr.Arguments[0] = input;
+					return true;
+				}
+			}
+			return false;
 		}
 		#endregion
 		
@@ -129,25 +164,6 @@ namespace ICSharpCode.Decompiler.ILAst
 		}
 		#endregion
 		
-		#region SimplifyLdcI4ConvI8
-		static bool SimplifyLdcI4ConvI8(List<ILNode> body, ILExpression expr, int pos)
-		{
-			ILExpression ldc;
-			int val;
-			if (expr.Match(ILCode.Conv_I8, out ldc) && ldc.Match(ILCode.Ldc_I4, out val)) {
-				expr.Code = ILCode.Ldc_I8;
-				expr.Operand = (long)val;
-				expr.Arguments.Clear();
-				return true;
-			}
-			bool modified = false;
-			foreach(ILExpression arg in expr.Arguments) {
-				modified |= SimplifyLdcI4ConvI8(null, arg, -1);
-			}
-			return modified;
-		}
-		#endregion
-		
 		#region CachedDelegateInitialization
 		void CachedDelegateInitializationWithField(ILBlock block, ref int i)
 		{

ICSharpCode.Decompiler/ILAst/TypeAnalysis.cs

@@ -606,8 +606,19 @@ namespace ICSharpCode.Decompiler.ILAst
 					#endregion
 					#region Array instructions
 				case ILCode.Newarr:
-					if (forceInferChildren)
-						InferTypeForExpression(expr.Arguments.Single(), typeSystem.Int32);
+					if (forceInferChildren) {
+						var lengthType = InferTypeForExpression(expr.Arguments.Single(), null);
+						if (lengthType == typeSystem.IntPtr) {
+							lengthType = typeSystem.Int64;
+						} else if (lengthType == typeSystem.UIntPtr) {
+							lengthType = typeSystem.UInt64;
+						} else if (lengthType != typeSystem.UInt32 && lengthType != typeSystem.Int64 && lengthType != typeSystem.UInt64) {
+							lengthType = typeSystem.Int32;
+						}
+						if (forceInferChildren) {
+							InferTypeForExpression(expr.Arguments.Single(), lengthType);
+						}
+					}
 					return new ArrayType((TypeReference)expr.Operand);
 				case ILCode.InitArray:
 					var operandAsArrayType = (ArrayType)expr.Operand;

ICSharpCode.Decompiler/Tests/TypeAnalysisTests.cs

@@ -120,4 +120,14 @@ public class TypeAnalysisTests
 		Console.WriteLine(o is Random);
 		Console.WriteLine(!(o is Random));
 	}
+	
+	public byte[] CreateArrayWithInt(int length)
+	{
+		return new byte[length];
+	}
+	
+	public byte[] CreateArrayWithLong(long length)
+	{
+		return new byte[length];
+	}
 }