Merge branch 'master' of git://github.com/icsharpcode/ILSpy into Debugger

ICSharpCode.Decompiler/Ast/AstBuilder.cs

@@ -300,8 +300,9 @@ namespace ICSharpCode.Decompiler.Ast
 			
 			if (type is Mono.Cecil.ByReferenceType) {
 				typeIndex++;
-				// ignore by reference type (cannot be represented in C#)
+				// by reference type cannot be represented in C#; so we'll represent it as a pointer instead
-				return ConvertType((type as Mono.Cecil.ByReferenceType).ElementType, typeAttributes, ref typeIndex);
+				return ConvertType((type as Mono.Cecil.ByReferenceType).ElementType, typeAttributes, ref typeIndex)
+					.MakePointerType();
 			} else if (type is Mono.Cecil.PointerType) {
 				typeIndex++;
 				return ConvertType((type as Mono.Cecil.PointerType).ElementType, typeAttributes, ref typeIndex)
@@ -850,6 +851,9 @@ namespace ICSharpCode.Decompiler.Ast
 				
 				if (paramDef.ParameterType is ByReferenceType) {
 					astParam.ParameterModifier = (!paramDef.IsIn && paramDef.IsOut) ? ParameterModifier.Out : ParameterModifier.Ref;
+					ComposedType ct = astParam.Type as ComposedType;
+					if (ct != null && ct.PointerRank > 0)
+						ct.PointerRank--;
 				}
 				if (paramDef.HasCustomAttributes) {
 					foreach (CustomAttribute ca in paramDef.CustomAttributes) {

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -181,6 +181,21 @@ namespace ICSharpCode.Decompiler.Ast
 					tryCatchStmt.CatchClauses.Add(cc);
 				}
 				yield return tryCatchStmt;
+			} else if (node is ILFixedStatement) {
+				ILFixedStatement fixedNode = (ILFixedStatement)node;
+				ILVariable v;
+				ILExpression init;
+				if (!fixedNode.Initializer.Match(ILCode.Stloc, out v, out init))
+					throw new InvalidOperationException("Fixed initializer must be an assignment to a local variable");
+				FixedStatement fixedStatement = new FixedStatement();
+				fixedStatement.Type = AstBuilder.ConvertType(v.Type);
+				fixedStatement.Variables.Add(
+					new VariableInitializer {
+						Name = v.Name,
+						Initializer = (Expression)TransformExpression(init)
+					}.WithAnnotation(v));
+				fixedStatement.EmbeddedStatement = TransformBlock(fixedNode.BodyBlock);
+				yield return fixedStatement;
 			} else if (node is ILBlock) {
 				yield return TransformBlock((ILBlock)node);
 			} else if (node is ILComment) {

ICSharpCode.Decompiler/Ast/DeclareVariableInSmallestScope.cs

@@ -54,6 +54,10 @@ namespace ICSharpCode.Decompiler.Ast
 				if (ident != null && ident.Identifier == name && ident.TypeArguments.Count == 0)
 					return node;
 				
+				FixedStatement fixedStatement = node as FixedStatement;
+				if (fixedStatement != null && fixedStatement.Variables.Single().Name == name)
+					return null; // no need to introduce the variable here
+				
 				AstNode withinCurrent = FindInsertPos(node.FirstChild, name, allowPassIntoLoops);
 				if (withinCurrent != null) {
 					if (pos == null) {

ICSharpCode.Decompiler/Ast/NameVariables.cs

@@ -216,7 +216,7 @@ namespace ICSharpCode.Decompiler.Ast
 			string name;
 			if (type.IsArray) {
 				name = "array";
-			} else if (type.IsPointer) {
+			} else if (type.IsPointer || type.IsByReference) {
 				name = "ptr";
 			} else if (!typeNameToVariableNameDict.TryGetValue(type.FullName, out name)) {
 				name = type.Name;

ICSharpCode.Decompiler/Ast/Transforms/IntroduceUnsafeModifier.cs

@@ -28,6 +28,7 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 		
 		public override bool VisitPointerReferenceExpression(PointerReferenceExpression pointerReferenceExpression, object data)
 		{
+			base.VisitPointerReferenceExpression(pointerReferenceExpression, data);
 			return true;
 		}
 		
@@ -41,10 +42,34 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 		
 		public override bool VisitUnaryOperatorExpression(UnaryOperatorExpression unaryOperatorExpression, object data)
 		{
-			if (unaryOperatorExpression.Operator == UnaryOperatorType.Dereference || unaryOperatorExpression.Operator == UnaryOperatorType.AddressOf)
+			base.VisitUnaryOperatorExpression(unaryOperatorExpression, data);
+			if (unaryOperatorExpression.Operator == UnaryOperatorType.Dereference) {
+				BinaryOperatorExpression bop = unaryOperatorExpression.Expression as BinaryOperatorExpression;
+				if (bop != null && bop.Operator == BinaryOperatorType.Add) {
+					// TODO: transform "*(ptr + int)" to "ptr[int]"
+				}
 				return true;
-			else
+			} else if (unaryOperatorExpression.Operator == UnaryOperatorType.AddressOf) {
-				return base.VisitUnaryOperatorExpression(unaryOperatorExpression, data);
+				return true;
+			} else {
+				return false;
+			}
+		}
+		
+		public override bool VisitMemberReferenceExpression(MemberReferenceExpression memberReferenceExpression, object data)
+		{
+			bool result = base.VisitMemberReferenceExpression(memberReferenceExpression, data);
+			UnaryOperatorExpression uoe = memberReferenceExpression.Target as UnaryOperatorExpression;
+			if (uoe != null && uoe.Operator == UnaryOperatorType.Dereference) {
+				PointerReferenceExpression pre = new PointerReferenceExpression();
+				pre.Target = uoe.Expression.Detach();
+				pre.MemberName = memberReferenceExpression.MemberName;
+				memberReferenceExpression.TypeArguments.MoveTo(pre.TypeArguments);
+				pre.CopyAnnotationsFrom(uoe);
+				pre.CopyAnnotationsFrom(memberReferenceExpression);
+				memberReferenceExpression.ReplaceWith(pre);
+			}
+			return result;
 		}
 	}
 }

ICSharpCode.Decompiler/Disassembler/DisassemblerHelpers.cs

@@ -118,7 +118,7 @@ namespace ICSharpCode.Decompiler.Disassembler
 		{
 			if (type is PinnedType) {
 				writer.Write("pinned ");
-				type.GetElementType().WriteTo(writer, onlyName, shortName);
+				((PinnedType)type).ElementType.WriteTo(writer, onlyName, shortName);
 			} else if (type is ArrayType) {
 				ArrayType at = (ArrayType)type;
 				at.ElementType.WriteTo(writer, onlyName, shortName);
@@ -128,10 +128,10 @@ namespace ICSharpCode.Decompiler.Disassembler
 			} else if (type is GenericParameter) {
 				writer.WriteReference(type.Name, type);
 			} else if (type is ByReferenceType) {
-				type.GetElementType().WriteTo(writer, onlyName, shortName);
+				((ByReferenceType)type).ElementType.WriteTo(writer, onlyName, shortName);
 				writer.Write('&');
 			} else if (type is PointerType) {
-				type.GetElementType().WriteTo(writer, onlyName, shortName);
+				((PointerType)type).ElementType.WriteTo(writer, onlyName, shortName);
 				writer.Write('*');
 			} else if (type is GenericInstanceType) {
 				type.GetElementType().WriteTo(writer, onlyName, shortName);
@@ -147,12 +147,12 @@ namespace ICSharpCode.Decompiler.Disassembler
 				writer.Write("modopt(");
 				((OptionalModifierType)type).ModifierType.WriteTo(writer, true, shortName);
 				writer.Write(") ");
-				type.GetElementType().WriteTo(writer, onlyName, shortName);
+				((OptionalModifierType)type).ElementType.WriteTo(writer, onlyName, shortName);
 			} else if (type is RequiredModifierType) {
 				writer.Write("modreq(");
 				((RequiredModifierType)type).ModifierType.WriteTo(writer, true, shortName);
 				writer.Write(") ");
-				type.GetElementType().WriteTo(writer, onlyName, shortName);
+				((RequiredModifierType)type).ElementType.WriteTo(writer, onlyName, shortName);
 			} else {
 				string name = PrimitiveTypeName(type);
 				if (name != null) {

ICSharpCode.Decompiler/ILAst/ILAstBuilder.cs

@@ -487,14 +487,16 @@ namespace ICSharpCode.Decompiler.ILAst
 					
 					List<VariableInfo> newVars;
 					
+					bool isPinned = methodDef.Body.Variables[variableIndex].IsPinned;
+					// If the variable is pinned, use single variable.
 					// If any of the loads is from "all", use single variable
 					// If any of the loads is ldloca, fallback to single variable as well
-					if (loads.Any(b => b.VariablesBefore[variableIndex].StoredByAll || b.Code == ILCode.Ldloca)) {
+					if (isPinned || loads.Any(b => b.VariablesBefore[variableIndex].StoredByAll || b.Code == ILCode.Ldloca)) {
 						newVars = new List<VariableInfo>(1) { new VariableInfo() {
 							Variable = new ILVariable() {
 								Name = "var_" + variableIndex,
-						    		Type = varType,
+								Type = isPinned ? ((PinnedType)varType).ElementType : varType,
-						    		OriginalVariable = methodDef.Body.Variables[variableIndex]
+						    	OriginalVariable = methodDef.Body.Variables[variableIndex]
 							},
 							Stores = stores,
 							Loads  = loads

ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs

@@ -125,10 +125,7 @@ namespace ICSharpCode.Decompiler.ILAst
 			// open up additional inlining possibilities.
 			new ILInlining(method).InlineAllVariables();
 			
-			foreach (ILExpression expr in method.GetSelfAndChildrenRecursive<ILExpression>()) {
+			TypeAnalysis.Reset(method);
-				expr.InferredType = null;
-				expr.ExpectedType = null;
-			}
 			
 			if (abortBeforeStep == ILAstOptimizationStep.PeepholeTransforms) return;
 			PeepholeTransforms.Run(context, method);
@@ -699,8 +696,10 @@ namespace ICSharpCode.Decompiler.ILAst
 		{
 			switch(expr.Code) {
 				case ILCode.Call:
-				case ILCode.Calli:
 				case ILCode.Callvirt:
+					// property getters can't be expression statements, but all other method calls can be
+					MethodReference mr = (MethodReference)expr.Operand;
+					return !mr.Name.StartsWith("get_", StringComparison.Ordinal);
 				case ILCode.Newobj:
 				case ILCode.Newarr:
 					return true;

ICSharpCode.Decompiler/ILAst/ILAstTypes.cs

@@ -202,6 +202,10 @@ namespace ICSharpCode.Decompiler.ILAst
 		public VariableDefinition OriginalVariable;
 		public ParameterDefinition OriginalParameter;
 		
+		public bool IsPinned {
+			get { return OriginalVariable != null && OriginalVariable.IsPinned; }
+		}
+		
 		public bool IsParameter {
 			get { return OriginalParameter != null; }
 		}
@@ -346,6 +350,11 @@ namespace ICSharpCode.Decompiler.ILAst
 					if (this.InferredType != null) {
 						output.Write(':');
 						this.InferredType.WriteTo(output, true, true);
+						if (this.ExpectedType != null && this.ExpectedType.FullName != this.InferredType.FullName) {
+							output.Write("[exp:");
+							this.ExpectedType.WriteTo(output, true, true);
+							output.Write(']');
+						}
 					}
 					return;
 				}
@@ -516,4 +525,30 @@ namespace ICSharpCode.Decompiler.ILAst
 			output.WriteLine("}");
 		}
 	}
+	
+	public class ILFixedStatement : ILNode
+	{
+		public ILExpression Initializer;
+		public ILBlock      BodyBlock;
+		
+		public override IEnumerable<ILNode> GetChildren()
+		{
+			if (this.Initializer != null)
+				yield return this.Initializer;
+			if (this.BodyBlock != null)
+				yield return this.BodyBlock;
+		}
+		
+		public override void WriteTo(ITextOutput output)
+		{
+			output.Write("fixed (");
+			if (this.Initializer != null)
+				this.Initializer.WriteTo(output);
+			output.WriteLine(") {");
+			output.Indent();
+			this.BodyBlock.WriteTo(output);
+			output.Unindent();
+			output.WriteLine("}");
+		}
+	}
 }

ICSharpCode.Decompiler/ILAst/ILCodes.cs

@@ -433,6 +433,8 @@ namespace ICSharpCode.Decompiler.ILAst
 					case ILCode.__Stind_I2:  code = ILCode.Stobj; operand = methodBody.Method.Module.TypeSystem.Int16; break;
 					case ILCode.__Stind_I4:  code = ILCode.Stobj; operand = methodBody.Method.Module.TypeSystem.Int32; break;
 					case ILCode.__Stind_I8:  code = ILCode.Stobj; operand = methodBody.Method.Module.TypeSystem.Int64; break;
+					case ILCode.__Stind_R4:  code = ILCode.Stobj; operand = methodBody.Method.Module.TypeSystem.Single; break;
+					case ILCode.__Stind_R8:  code = ILCode.Stobj; operand = methodBody.Method.Module.TypeSystem.Double; break;
 			}
 		}
 		

ICSharpCode.Decompiler/ILAst/ILInlining.cs

@@ -113,7 +113,7 @@ namespace ICSharpCode.Decompiler.ILAst
 		{
 			ILVariable v;
 			ILExpression inlinedExpression;
-			if (block.Body[pos].Match(ILCode.Stloc, out v, out inlinedExpression)) {
+			if (block.Body[pos].Match(ILCode.Stloc, out v, out inlinedExpression) && !v.IsPinned) {
 				if (InlineIfPossible(v, inlinedExpression, block.Body.ElementAtOrDefault(pos+1), aggressive)) {
 					// Assign the ranges of the stloc instruction:
 					inlinedExpression.ILRanges.AddRange(((ILExpression)block.Body[pos]).ILRanges);

ICSharpCode.Decompiler/ILAst/PeepholeTransform.cs

@@ -30,7 +30,8 @@ namespace ICSharpCode.Decompiler.ILAst
 				initializerTransforms.TransformArrayInitializers,
 				initializerTransforms.TransformCollectionInitializers,
 				transforms.CachedDelegateInitialization,
-				transforms.MakeAssignmentExpression
+				transforms.MakeAssignmentExpression,
+				transforms.IntroduceFixedStatements
 			};
 			Func<ILExpression, ILExpression>[] exprTransforms = {
 				HandleDecimalConstants,
@@ -292,5 +293,105 @@ namespace ICSharpCode.Decompiler.ILAst
 			return false;
 		}
 		#endregion
+		
+		#region IntroduceFixedStatements
+		void IntroduceFixedStatements(ILBlock block, ref int i)
+		{
+			// stloc(pinned_Var, conv.u(ldc.i4(0)))
+			ILExpression initValue;
+			ILVariable pinnedVar;
+			if (!MatchFixedInitializer(block, i, out pinnedVar, out initValue))
+				return;
+			// find initialization of v:
+			int j;
+			for (j = i + 1; j < block.Body.Count; j++) {
+				ILVariable v2;
+				ILExpression storedVal;
+				if (block.Body[j].Match(ILCode.Stloc, out v2, out storedVal) && v2 == pinnedVar) {
+					if (IsNullOrZero(storedVal)) {
+						// Create fixed statement from i to j
+						ILFixedStatement stmt = new ILFixedStatement();
+						stmt.Initializer = initValue;
+						stmt.BodyBlock = new ILBlock(block.Body.GetRange(i + 1, j - i - 1)); // from i+1 to j-1 (inclusive)
+						block.Body.RemoveRange(i + 1, j - i); // from j+1 to i (inclusive)
+						block.Body[i] = stmt;
+						if (pinnedVar.Type.IsByReference)
+							pinnedVar.Type = new PointerType(((ByReferenceType)pinnedVar.Type).ElementType);
+						break;
+					}
+				}
+			}
+		}
+		
+		bool IsNullOrZero(ILExpression expr)
+		{
+			if (expr.Code == ILCode.Conv_U || expr.Code == ILCode.Conv_I)
+				expr = expr.Arguments[0];
+			return (expr.Code == ILCode.Ldc_I4 && (int)expr.Operand == 0) || expr.Code == ILCode.Ldnull;
+		}
+		
+		bool MatchFixedInitializer(ILBlock block, int i, out ILVariable pinnedVar, out ILExpression initValue)
+		{
+			if (block.Body[i].Match(ILCode.Stloc, out pinnedVar, out initValue)) {
+				initValue = (ILExpression)block.Body[i];
+				return pinnedVar.IsPinned;
+			}
+			ILCondition ifStmt = block.Body[i] as ILCondition;
+			ILExpression arrayLoadingExpr;
+			if (ifStmt != null && MatchFixedArrayInitializerCondition(ifStmt.Condition, out arrayLoadingExpr)) {
+				ILVariable arrayVariable = (ILVariable)arrayLoadingExpr.Operand;
+				ILExpression trueValue;
+				if (ifStmt.TrueBlock != null && ifStmt.TrueBlock.Body.Count == 1
+				    && ifStmt.TrueBlock.Body[0].Match(ILCode.Stloc, out pinnedVar, out trueValue)
+				    && pinnedVar.IsPinned && IsNullOrZero(trueValue))
+				{
+					ILVariable stlocVar;
+					ILExpression falseValue;
+					if (ifStmt.FalseBlock != null && ifStmt.FalseBlock.Body.Count == 1
+					    && ifStmt.FalseBlock.Body[0].Match(ILCode.Stloc, out stlocVar, out falseValue) && stlocVar == pinnedVar)
+					{
+						ILVariable loadedVariable;
+						if (falseValue.Code == ILCode.Ldelema
+							&& falseValue.Arguments[0].Match(ILCode.Ldloc, out loadedVariable) && loadedVariable == arrayVariable
+							&& IsNullOrZero(falseValue.Arguments[1]))
+						{
+							initValue = new ILExpression(ILCode.Stloc, pinnedVar, arrayLoadingExpr);
+							return true;
+						}
+					}
+				}
+			}
+			initValue = null;
+			return false;
+		}
+		
+		bool MatchFixedArrayInitializerCondition(ILExpression condition, out ILExpression initValue)
+		{
+			ILExpression logicAnd;
+			ILVariable arrayVar1, arrayVar2;
+			if (condition.Match(ILCode.LogicNot, out logicAnd) && logicAnd.Code == ILCode.LogicAnd) {
+				initValue = UnpackDoubleNegation(logicAnd.Arguments[0]);
+				if (initValue.Match(ILCode.Ldloc, out arrayVar1)) {
+					ILExpression arrayLength = logicAnd.Arguments[1];
+					if (arrayLength.Code == ILCode.Conv_I4)
+						arrayLength = arrayLength.Arguments[0];
+					if (arrayLength.Code == ILCode.Ldlen && arrayLength.Arguments[0].Match(ILCode.Ldloc, out arrayVar2)) {
+						return arrayVar1 == arrayVar2;
+					}
+				}
+			}
+			initValue = null;
+			return false;
+		}
+		
+		ILExpression UnpackDoubleNegation(ILExpression expr)
+		{
+			ILExpression negated;
+			if (expr.Match(ILCode.LogicNot, out negated) && negated.Match(ILCode.LogicNot, out negated))
+				return negated;
+			else
+				return expr;
+		}
+		#endregion
 	}
 }

ICSharpCode.Decompiler/ILAst/TypeAnalysis.cs

@@ -45,24 +45,32 @@ namespace ICSharpCode.Decompiler.ILAst
 		{
 			ILCondition cond = node as ILCondition;
 			if (cond != null) {
-				InferTypeForExpression(cond.Condition, typeSystem.Boolean, false);
+				cond.Condition.ExpectedType = typeSystem.Boolean;
 			}
 			ILWhileLoop loop = node as ILWhileLoop;
 			if (loop != null && loop.Condition != null) {
-				InferTypeForExpression(loop.Condition, typeSystem.Boolean, false);
+				loop.Condition.ExpectedType = typeSystem.Boolean;
 			}
 			ILExpression expr = node as ILExpression;
 			if (expr != null) {
-				ILVariable v = expr.Operand as ILVariable;
+				foreach (ILExpression store in expr.GetSelfAndChildrenRecursive<ILExpression>(e => e.Code == ILCode.Stloc)) {
-				if (v != null && v.IsGenerated && v.Type == null && expr.Code == ILCode.Stloc && !inferredVariables.Contains(v) && HasSingleLoad(v)) {
+					ILVariable v = (ILVariable)store.Operand;
-					// Don't deal with this node or its children yet,
+					if (v.IsGenerated && v.Type == null && !inferredVariables.Contains(v) && HasSingleLoad(v)) {
-					// wait for the expected type to be inferred first.
+						// Don't deal with this node or its children yet,
-					// This happens with the arg_... variables introduced by the ILAst - we skip inferring the whole statement,
+						// wait for the expected type to be inferred first.
-					// and first infer the statement that reads from the arg_... variable.
+						// This happens with the arg_... variables introduced by the ILAst - we skip inferring the whole statement,
-					// The ldloc inference will write the expected type to the variable, and the next InferRemainingStores() pass
+						// and first infer the statement that reads from the arg_... variable.
-					// will then infer this statement with the correct expected type.
+						// The ldloc inference will write the expected type to the variable, and the next InferRemainingStores() pass
-					storedToGeneratedVariables.Add(expr);
+						// will then infer this statement with the correct expected type.
-					return;
+						storedToGeneratedVariables.Add(expr);
+						// However, it is possible that this statement both writes to and reads from the variable (think inlined assignments).
+						if (expr.GetSelfAndChildrenRecursive<ILExpression>(e => e.Code == ILCode.Ldlen && e.Operand == v).Any()) {
+							// In this case, we analyze it now anyways, and will re-evaluate it later
+							break;
+						} else {
+							return;
+						}
+					}
 				}
 				bool anyArgumentIsMissingType = expr.Arguments.Any(a => a.InferredType == null);
 				if (expr.InferredType == null || anyArgumentIsMissingType)
@@ -184,6 +192,8 @@ namespace ICSharpCode.Decompiler.ILAst
 									Instruction constraint = expr.GetPrefix(Code.Constrained);
 									if (constraint != null)
 										InferTypeForExpression(expr.Arguments[i], new ByReferenceType((TypeReference)constraint.Operand));
+									else if (method.DeclaringType.IsValueType)
+										InferTypeForExpression(expr.Arguments[i], new ByReferenceType(method.DeclaringType));
 									else
 										InferTypeForExpression(expr.Arguments[i], method.DeclaringType);
 								} else {
@@ -247,18 +257,54 @@ namespace ICSharpCode.Decompiler.ILAst
 					}
 					return null;
 				case ILCode.Ldobj:
-					if (forceInferChildren) {
+					{
-						if (InferTypeForExpression(expr.Arguments[0], new ByReferenceType((TypeReference)expr.Operand)) is PointerType)
+						TypeReference type = (TypeReference)expr.Operand;
-							InferTypeForExpression(expr.Arguments[0], new PointerType((TypeReference)expr.Operand));
+						if (expectedType != null) {
+							int infoAmount = GetInformationAmount(expectedType);
+							if (infoAmount == 1 && GetInformationAmount(type) == 8) {
+								// A bool can be loaded from both bytes and sbytes.
+								type = expectedType;
+							}
+							if (infoAmount >= 8 && infoAmount <= 64 && infoAmount == GetInformationAmount(type)) {
+								// An integer can be loaded as another integer of the same size.
+								// For integers smaller than 32 bit, the signs must match (as loading performs sign extension)
+								if (infoAmount >= 32 || IsSigned(expectedType) == IsSigned(type))
+									type = expectedType;
+							}
+						}
+						if (forceInferChildren) {
+							if (InferTypeForExpression(expr.Arguments[0], new ByReferenceType(type)) is PointerType)
+								InferTypeForExpression(expr.Arguments[0], new PointerType(type));
+						}
+						return type;
 					}
-					return (TypeReference)expr.Operand;
 				case ILCode.Stobj:
-					if (forceInferChildren) {
+					{
-						if (InferTypeForExpression(expr.Arguments[0], new ByReferenceType((TypeReference)expr.Operand)) is PointerType)
+						TypeReference operandType = (TypeReference)expr.Operand;
-							InferTypeForExpression(expr.Arguments[0], new PointerType((TypeReference)expr.Operand));
+						TypeReference pointerType = InferTypeForExpression(expr.Arguments[0], new ByReferenceType(operandType));
-						InferTypeForExpression(expr.Arguments[1], (TypeReference)expr.Operand);
+						TypeReference elementType;
+						if (pointerType is PointerType)
+							elementType = ((PointerType)pointerType).ElementType;
+						else if (pointerType is ByReferenceType)
+							elementType = ((ByReferenceType)pointerType).ElementType;
+						else
+							elementType = null;
+						if (elementType != null) {
+							// An integer can be stored in any other integer of the same size.
+							int infoAmount = GetInformationAmount(elementType);
+							if (infoAmount == 1) infoAmount = 8;
+							if (infoAmount == GetInformationAmount(operandType) && IsSigned(elementType) != null && IsSigned(operandType) != null)
+								operandType = elementType;
+						}
+						if (forceInferChildren) {
+							if (pointerType is PointerType)
+								InferTypeForExpression(expr.Arguments[0], new PointerType(operandType));
+							else if (operandType != expr.Operand)
+								InferTypeForExpression(expr.Arguments[0], new ByReferenceType(operandType));
+							InferTypeForExpression(expr.Arguments[1], operandType);
+						}
+						return operandType;
 					}
-					return (TypeReference)expr.Operand;
 				case ILCode.Initobj:
 					return null;
 				case ILCode.DefaultValue:
@@ -284,19 +330,19 @@ namespace ICSharpCode.Decompiler.ILAst
 				case ILCode.Or:
 				case ILCode.And:
 				case ILCode.Xor:
-					return InferArgumentsInBinaryOperator(expr, null);
+					return InferArgumentsInBinaryOperator(expr, null, expectedType);
 				case ILCode.Add_Ovf:
 				case ILCode.Sub_Ovf:
 				case ILCode.Mul_Ovf:
 				case ILCode.Div:
 				case ILCode.Rem:
-					return InferArgumentsInBinaryOperator(expr, true);
+					return InferArgumentsInBinaryOperator(expr, true, expectedType);
 				case ILCode.Add_Ovf_Un:
 				case ILCode.Sub_Ovf_Un:
 				case ILCode.Mul_Ovf_Un:
 				case ILCode.Div_Un:
 				case ILCode.Rem_Un:
-					return InferArgumentsInBinaryOperator(expr, false);
+					return InferArgumentsInBinaryOperator(expr, false, expectedType);
 				case ILCode.Shl:
 				case ILCode.Shr:
 					if (forceInferChildren)
@@ -403,31 +449,31 @@ namespace ICSharpCode.Decompiler.ILAst
 				case ILCode.Conv_I1:
 				case ILCode.Conv_Ovf_I1:
 				case ILCode.Conv_Ovf_I1_Un:
-					return HandleConversion(8, true, expr.Arguments[0], expectedType, typeSystem.Byte);
+					return HandleConversion(8, true, expr.Arguments[0], expectedType, typeSystem.SByte);
 				case ILCode.Conv_I2:
 				case ILCode.Conv_Ovf_I2:
 				case ILCode.Conv_Ovf_I2_Un:
-					return HandleConversion(16, true, expr.Arguments[0], expectedType, typeSystem.UInt16);
+					return HandleConversion(16, true, expr.Arguments[0], expectedType, typeSystem.Int16);
 				case ILCode.Conv_I4:
 				case ILCode.Conv_Ovf_I4:
 				case ILCode.Conv_Ovf_I4_Un:
-					return HandleConversion(32, true, expr.Arguments[0], expectedType, typeSystem.UInt32);
+					return HandleConversion(32, true, expr.Arguments[0], expectedType, typeSystem.Int32);
 				case ILCode.Conv_I8:
 				case ILCode.Conv_Ovf_I8:
 				case ILCode.Conv_Ovf_I8_Un:
-					return HandleConversion(64, true, expr.Arguments[0], expectedType, typeSystem.UInt64);
+					return HandleConversion(64, true, expr.Arguments[0], expectedType, typeSystem.Int64);
 				case ILCode.Conv_U1:
 				case ILCode.Conv_Ovf_U1:
 				case ILCode.Conv_Ovf_U1_Un:
-					return HandleConversion(8, false, expr.Arguments[0], expectedType, typeSystem.SByte);
+					return HandleConversion(8, false, expr.Arguments[0], expectedType, typeSystem.Byte);
 				case ILCode.Conv_U2:
 				case ILCode.Conv_Ovf_U2:
 				case ILCode.Conv_Ovf_U2_Un:
-					return HandleConversion(16, false, expr.Arguments[0], expectedType, typeSystem.Int16);
+					return HandleConversion(16, false, expr.Arguments[0], expectedType, typeSystem.UInt16);
 				case ILCode.Conv_U4:
 				case ILCode.Conv_Ovf_U4:
 				case ILCode.Conv_Ovf_U4_Un:
-					return HandleConversion(32, false, expr.Arguments[0], expectedType, typeSystem.Int32);
+					return HandleConversion(32, false, expr.Arguments[0], expectedType, typeSystem.UInt32);
 				case ILCode.Conv_U8:
 				case ILCode.Conv_Ovf_U8:
 				case ILCode.Conv_Ovf_U8_Un:
@@ -458,17 +504,17 @@ namespace ICSharpCode.Decompiler.ILAst
 					#region Comparison instructions
 				case ILCode.Ceq:
 					if (forceInferChildren)
-						InferArgumentsInBinaryOperator(expr, null);
+						InferArgumentsInBinaryOperator(expr, null, null);
 					return typeSystem.Boolean;
 				case ILCode.Clt:
 				case ILCode.Cgt:
 					if (forceInferChildren)
-						InferArgumentsInBinaryOperator(expr, true);
+						InferArgumentsInBinaryOperator(expr, true, null);
 					return typeSystem.Boolean;
 				case ILCode.Clt_Un:
 				case ILCode.Cgt_Un:
 					if (forceInferChildren)
-						InferArgumentsInBinaryOperator(expr, false);
+						InferArgumentsInBinaryOperator(expr, false, null);
 					return typeSystem.Boolean;
 					#endregion
 					#region Branch instructions
@@ -613,12 +659,12 @@ namespace ICSharpCode.Decompiler.ILAst
 			return type;
 		}
 		
-		TypeReference InferArgumentsInBinaryOperator(ILExpression expr, bool? isSigned)
+		TypeReference InferArgumentsInBinaryOperator(ILExpression expr, bool? isSigned, TypeReference expectedType)
 		{
 			ILExpression left = expr.Arguments[0];
 			ILExpression right = expr.Arguments[1];
-			TypeReference leftPreferred = DoInferTypeForExpression(left, null);
+			TypeReference leftPreferred = DoInferTypeForExpression(left, expectedType);
-			TypeReference rightPreferred = DoInferTypeForExpression(right, null);
+			TypeReference rightPreferred = DoInferTypeForExpression(right, expectedType);
 			if (leftPreferred == rightPreferred) {
 				return left.InferredType = right.InferredType = left.ExpectedType = right.ExpectedType = leftPreferred;
 			} else if (rightPreferred == DoInferTypeForExpression(left, rightPreferred)) {
@@ -768,5 +814,19 @@ namespace ICSharpCode.Decompiler.ILAst
 					return TypeCode.Object;
 			}
 		}
+		
+		/// <summary>
+		/// Clears the type inference data on the method.
+		/// </summary>
+		public static void Reset(ILBlock method)
+		{
+			foreach (ILExpression expr in method.GetSelfAndChildrenRecursive<ILExpression>()) {
+				expr.InferredType = null;
+				expr.ExpectedType = null;
+				ILVariable v = expr.Operand as ILVariable;
+				if (v != null && v.IsGenerated)
+					v.Type = null;
+			}
+		}
 	}
 }

ICSharpCode.Decompiler/Tests/UnsafeCode.cs

@@ -26,4 +26,34 @@ public class UnsafeCode
 	{
 		PassRefParameterAsPointer(ref *p);
 	}
+	
+	public unsafe void FixedStringAccess(string text)
+	{
+		fixed (char* c = text) {
+			char* tmp = c;
+			while (*tmp != 0) {
+				*tmp = 'A';
+				tmp++;
+			}
+		}
+	}
+	
+	public unsafe void PutDoubleIntoLongArray1(long[] array, int index, double val)
+	{
+		fixed (long* l = array) {
+			((double*)l)[index] = val;
+		}
+	}
+	
+	public unsafe void PutDoubleIntoLongArray2(long[] array, int index, double val)
+	{
+		fixed (long* l = &array[index]) {
+			*(double*)l = val;
+		}
+	}
+	
+	public unsafe string PointerReferenceExpression(double* d)
+	{
+		return d->ToString();
+	}
 }

ILSpy/CSharpLanguage.cs

@@ -408,6 +408,9 @@ namespace ICSharpCode.ILSpy
 					w.Write("out ");
 				else
 					w.Write("ref ");
+				
+				if (astType is ComposedType && ((ComposedType)astType).PointerRank > 0)
+					((ComposedType)astType).PointerRank--;
 			}
 			
 			astType.AcceptVisitor(new OutputVisitor(w, new CSharpFormattingPolicy()), null);

ILSpy/ILAstLanguage.cs

@@ -66,6 +66,8 @@ namespace ICSharpCode.ILSpy
 				output.WriteDefinition(v.Name, v);
 				if (v.Type != null) {
 					output.Write(" : ");
+					if (v.IsPinned)
+						output.Write("pinned ");
 					v.Type.WriteTo(output, true, true);
 				}
 				output.WriteLine();

NRefactory/ICSharpCode.NRefactory/CSharp/Ast/ComposedType.cs

@@ -55,6 +55,8 @@ namespace ICSharpCode.NRefactory.CSharp
 				return GetChildrenByRole(PointerRole).Count();
 			}
 			set {
+				if (value < 0)
+					throw new ArgumentOutOfRangeException();
 				int d = this.PointerRank;
 				while (d > value) {
 					GetChildByRole(PointerRole).Remove();

NRefactory/ICSharpCode.NRefactory/CSharp/OutputVisitor/OutputVisitor.cs

@@ -1387,9 +1387,13 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 			StartNode(fixedStatement);
 			WriteKeyword("fixed");
+			Space(policy.UsingParentheses);
 			LPar();
+			Space(policy.WithinUsingParentheses);
 			fixedStatement.Type.AcceptVisitor(this, data);
+			Space();
 			WriteCommaSeparatedList(fixedStatement.Variables);
+			Space(policy.WithinUsingParentheses);
 			RPar();
 			WriteEmbeddedStatement(fixedStatement.EmbeddedStatement);
 			return EndNode(fixedStatement);