1 files changed, 106 insertions, 0 deletions
diff --git a/ICSharpCode.Decompiler/Ast/Transforms/IntroduceUnsafeModifier.cs b/ICSharpCode.Decompiler/Ast/Transforms/IntroduceUnsafeModifier.cs
new file mode 100644
index 00000000..43548e38
--- /dev/null
+++ b/ICSharpCode.Decompiler/Ast/Transforms/IntroduceUnsafeModifier.cs
@@ -0,0 +1,106 @@
+// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
+// 
+// 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 System;
+using ICSharpCode.NRefactory.CSharp;
+
+namespace ICSharpCode.Decompiler.Ast.Transforms
+{
+	public class IntroduceUnsafeModifier : DepthFirstAstVisitor<object, bool>, IAstTransform
+	{
+		public static readonly object PointerArithmeticAnnotation = new PointerArithmetic();
+		
+		sealed class PointerArithmetic {}
+		
+		public void Run(AstNode compilationUnit)
+		{
+			compilationUnit.AcceptVisitor(this, null);
+		}
+		
+		protected override bool VisitChildren(AstNode node, object data)
+		{
+			bool result = false;
+			for (AstNode child = node.FirstChild; child != null; child = child.NextSibling) {
+				result |= child.AcceptVisitor(this, data);
+			}
+			if (result && node is EntityDeclaration && !(node is Accessor)) {
+				((EntityDeclaration)node).Modifiers |= Modifiers.Unsafe;
+				return false;
+			}
+			return result;
+		}
+		
+		public override bool VisitPointerReferenceExpression(PointerReferenceExpression pointerReferenceExpression, object data)
+		{
+			base.VisitPointerReferenceExpression(pointerReferenceExpression, data);
+			return true;
+		}
+		
+		public override bool VisitComposedType(ComposedType composedType, object data)
+		{
+			if (composedType.PointerRank > 0)
+				return true;
+			else
+				return base.VisitComposedType(composedType, data);
+		}
+		
+		public override bool VisitUnaryOperatorExpression(UnaryOperatorExpression unaryOperatorExpression, object data)
+		{
+			bool result = base.VisitUnaryOperatorExpression(unaryOperatorExpression, data);
+			if (unaryOperatorExpression.Operator == UnaryOperatorType.Dereference) {
+				BinaryOperatorExpression bop = unaryOperatorExpression.Expression as BinaryOperatorExpression;
+				if (bop != null && bop.Operator == BinaryOperatorType.Add && bop.Annotation<PointerArithmetic>() != null) {
+					// transform "*(ptr + int)" to "ptr[int]"
+					IndexerExpression indexer = new IndexerExpression();
+					indexer.Target = bop.Left.Detach();
+					indexer.Arguments.Add(bop.Right.Detach());
+					indexer.CopyAnnotationsFrom(unaryOperatorExpression);
+					indexer.CopyAnnotationsFrom(bop);
+					unaryOperatorExpression.ReplaceWith(indexer);
+				}
+				return true;
+			} else if (unaryOperatorExpression.Operator == UnaryOperatorType.AddressOf) {
+				return true;
+			} else {
+				return result;
+			}
+		}
+		
+		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;
+		}
+		
+		public override bool VisitStackAllocExpression(StackAllocExpression stackAllocExpression, object data)
+		{
+			base.VisitStackAllocExpression(stackAllocExpression, data);
+			return true;
+		}
+	}
+}