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// 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;
}
}
}
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