92 lines
2.9 KiB
C#
92 lines
2.9 KiB
C#
//
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// GatherLocals.cs
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//
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// Authors:
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// Alexander Chebaturkin (chebaturkin@gmail.com)
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//
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// Copyright (C) 2011 Alexander Chebaturkin
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections.Generic;
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using Mono.CodeContracts.Static.AST;
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using Mono.CodeContracts.Static.AST.Visitors;
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namespace Mono.CodeContracts.Static.ContractExtraction {
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class GatherLocals : NodeInspector {
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public HashSet<Local> Locals = new HashSet<Local> ();
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private Local exempt_result_local;
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public override void VisitLocal (Local node)
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{
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if (!IsLocalExempt (node) && !this.Locals.Contains (node))
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this.Locals.Add (node);
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base.VisitLocal (node);
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}
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public override void VisitAssignmentStatement (AssignmentStatement node)
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{
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if (node.Target is Local && IsResultExpression (node.Source))
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this.exempt_result_local = (Local) node.Target;
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base.VisitAssignmentStatement (node);
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}
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private bool IsResultExpression (Expression expression)
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{
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var methodCall = expression as MethodCall;
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if (methodCall == null)
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return false;
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var memberBinding = methodCall.Callee as MemberBinding;
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if (memberBinding == null)
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return false;
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var method = memberBinding.BoundMember as Method;
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if (method == null)
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return false;
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return method.HasGenericParameters && method.Name == "Result" && method.DeclaringType != null && method.DeclaringType.Name == "Contract";
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}
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private bool IsLocalExempt (Local local)
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{
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if (local == this.exempt_result_local)
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return true;
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bool result = false;
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if (local.Name != null && !local.Name.StartsWith ("local"))
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result = true;
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TypeNode type = local.Type;
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if (type == null || HelperMethods.IsCompilerGenerated (type) || local.Name == "_preconditionHolds")
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return true;
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if (result)
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return LocalNameIsExempt (local.Name);
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return true;
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}
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private bool LocalNameIsExempt (string name)
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{
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return name.StartsWith ("CS$") || name.StartsWith ("VB$");
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}
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}
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}
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