5 // Alexander Chebaturkin (chebaturkin@gmail.com)
7 // Copyright (C) 2011 Alexander Chebaturkin
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 using System.Collections.Generic;
30 using Mono.CodeContracts.Static.AST;
31 using Mono.CodeContracts.Static.AST.Visitors;
33 namespace Mono.CodeContracts.Static.ContractExtraction {
34 class GatherLocals : NodeInspector {
35 public HashSet<Local> Locals = new HashSet<Local> ();
36 private Local exempt_result_local;
38 public override void VisitLocal (Local node)
40 if (!IsLocalExempt (node) && !this.Locals.Contains (node))
41 this.Locals.Add (node);
42 base.VisitLocal (node);
45 public override void VisitAssignmentStatement (AssignmentStatement node)
47 if (node.Target is Local && IsResultExpression (node.Source))
48 this.exempt_result_local = (Local) node.Target;
49 base.VisitAssignmentStatement (node);
52 private bool IsResultExpression (Expression expression)
54 var methodCall = expression as MethodCall;
55 if (methodCall == null)
58 var memberBinding = methodCall.Callee as MemberBinding;
59 if (memberBinding == null)
62 var method = memberBinding.BoundMember as Method;
66 return method.HasGenericParameters && method.Name == "Result" && method.DeclaringType != null && method.DeclaringType.Name == "Contract";
69 private bool IsLocalExempt (Local local)
71 if (local == this.exempt_result_local)
74 if (local.Name != null && !local.Name.StartsWith ("local"))
76 TypeNode type = local.Type;
77 if (type == null || HelperMethods.IsCompilerGenerated (type) || local.Name == "_preconditionHolds")
81 return LocalNameIsExempt (local.Name);
86 private bool LocalNameIsExempt (string name)
88 return name.StartsWith ("CS$") || name.StartsWith ("VB$");