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//
// GatherLocals.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.Collections.Generic;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.AST.Visitors;
namespace Mono.CodeContracts.Static.ContractExtraction {
class GatherLocals : NodeInspector {
public HashSet<Local> Locals = new HashSet<Local> ();
private Local exempt_result_local;
public override void VisitLocal (Local node)
{
if (!IsLocalExempt (node) && !this.Locals.Contains (node))
this.Locals.Add (node);
base.VisitLocal (node);
}
public override void VisitAssignmentStatement (AssignmentStatement node)
{
if (node.Target is Local && IsResultExpression (node.Source))
this.exempt_result_local = (Local) node.Target;
base.VisitAssignmentStatement (node);
}
private bool IsResultExpression (Expression expression)
{
var methodCall = expression as MethodCall;
if (methodCall == null)
return false;
var memberBinding = methodCall.Callee as MemberBinding;
if (memberBinding == null)
return false;
var method = memberBinding.BoundMember as Method;
if (method == null)
return false;
return method.HasGenericParameters && method.Name == "Result" && method.DeclaringType != null && method.DeclaringType.Name == "Contract";
}
private bool IsLocalExempt (Local local)
{
if (local == this.exempt_result_local)
return true;
bool result = false;
if (local.Name != null && !local.Name.StartsWith ("local"))
result = true;
TypeNode type = local.Type;
if (type == null || HelperMethods.IsCompilerGenerated (type) || local.Name == "_preconditionHolds")
return true;
if (result)
return LocalNameIsExempt (local.Name);
return true;
}
private bool LocalNameIsExempt (string name)
{
return name.StartsWith ("CS$") || name.StartsWith ("VB$");
}
}
}
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