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//
// PathElement`1.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// 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 Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis.Paths {
class PathElement<T> : PathElementBase {
public readonly string Description;
public readonly T Element;
protected string castTo;
protected bool isManagedPointer;
protected bool isStatic;
protected bool isUnmanagedPointer;
#region Overrides of PathElement
public override bool IsStatic
{
get { return this.isStatic; }
}
public override bool IsUnmanagedPointer
{
get { return this.isUnmanagedPointer; }
}
public override bool IsManagedPointer
{
get { return this.isManagedPointer; }
}
public override bool IsParameterRef
{
get { return typeof (T) == typeof (Parameter); }
}
public override string CastTo
{
get { return this.castTo; }
}
public override bool IsAddressOf
{
get { return true; }
}
public override bool TryField (out Field f)
{
if (typeof (T) == typeof (Field)) {
f = (Field) (object) this.Element;
return true;
}
f = default(Field);
return false;
}
public override bool TryGetResultType (out TypeNode type)
{
type = ResultType;
return true;
}
public override TResult Decode<TData, TResult, TVisitor, TLabel> (TLabel label, TVisitor visitor, TData data)
{
if (typeof (T) == typeof (Field)) {
var field = (Field) (object) this.Element;
if (this.isStatic)
return visitor.LoadStaticFieldAddress (label, field, Dummy.Value, data);
return visitor.LoadFieldAddress (label, field, Dummy.Value, Dummy.Value, data);
}
if (typeof (T) == typeof (Local)) {
var local = (Local) (object) this.Element;
return visitor.LoadLocalAddress (label, local, Dummy.Value, data);
}
if (typeof (T) == typeof (Method)) {
var method = (Method) (object) this.Element;
bool isVirtualMethod = this.Func.IsVirtualMethod;
return visitor.Call (label, method, isVirtualMethod, Indexable<TypeNode>.Empty, Dummy.Value, Indexable<Dummy>.Empty, data);
}
if (typeof (T) == typeof (Parameter)) {
var parameter = (Parameter) (object) this.Element;
return visitor.LoadArgAddress (label, parameter, false, Dummy.Value, data);
}
throw new InvalidOperationException ("Field, Local, Method or Parameter expected");
}
public override string ToString ()
{
return this.Description;
}
#endregion
public PathElement (T element, string description, SymFunction c) : base (c)
{
this.Element = element;
this.Description = description;
this.isStatic = false;
this.isUnmanagedPointer = false;
this.isManagedPointer = false;
}
public TypeNode ResultType { get; protected set; }
public virtual bool IsCallerVisible ()
{
return (typeof (T) == typeof (Parameter));
}
#region Overrides of PathElementBase
public override bool TrySetType (TypeNode expectedType, IMetaDataProvider metaDataProvider, out TypeNode resultType)
{
if (typeof (T) == typeof (Parameter)) {
var p = (Parameter) (object) this.Element;
TypeNode type = metaDataProvider.ParameterType (p);
this.isManagedPointer = metaDataProvider.IsManagedPointer (type);
ResultType = resultType = metaDataProvider.ManagedPointer (type);
return true;
}
if (typeof (T) == typeof (Field)) {
var f = (Field) (object) this.Element;
TypeNode type = metaDataProvider.FieldType (f);
this.isStatic = metaDataProvider.IsStatic (f);
this.isManagedPointer = metaDataProvider.IsManagedPointer (type);
ResultType = resultType = metaDataProvider.ManagedPointer (type);
TypeNode declaringType = metaDataProvider.DeclaringType (f);
if (metaDataProvider.IsManagedPointer (expectedType))
expectedType = metaDataProvider.ElementType (expectedType);
expectedType = metaDataProvider.Unspecialized (expectedType);
if (!metaDataProvider.IsStatic (f) && declaringType.Equals (expectedType) &&
(!metaDataProvider.DerivesFrom (expectedType, declaringType) ||
!metaDataProvider.IsProtected (f) && !metaDataProvider.IsPublic (f)))
this.castTo = metaDataProvider.FullName (declaringType);
return true;
}
if (typeof (T) == typeof (Local)) {
var local = (Local) (object) this.Element;
TypeNode type = metaDataProvider.LocalType (local);
this.isManagedPointer = metaDataProvider.IsManagedPointer (type);
ResultType = resultType = metaDataProvider.ManagedPointer (type);
return true;
}
if (typeof (T) == typeof (Method)) {
var method = (Method) (object) this.Element;
ResultType = resultType = !IsAddressOf
? metaDataProvider.ReturnType (method)
: metaDataProvider.ManagedPointer (metaDataProvider.ReturnType (method));
if (metaDataProvider.IsManagedPointer (expectedType))
expectedType = metaDataProvider.ElementType (expectedType);
expectedType = metaDataProvider.Unspecialized (expectedType);
TypeNode declaringType = metaDataProvider.DeclaringType (method);
if (!metaDataProvider.IsStatic (method) && declaringType.Equals (expectedType) &&
(!metaDataProvider.DerivesFrom (expectedType, declaringType)
|| !metaDataProvider.IsProtected (method) && !metaDataProvider.IsPublic (method)))
this.castTo = metaDataProvider.FullName (declaringType);
return true;
}
ResultType = resultType = default(TypeNode);
return false;
}
#endregion
}
}
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