128 lines
4.4 KiB
C#
128 lines
4.4 KiB
C#
//
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// TransformContractsVisitor.cs
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//
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// Authors:
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// Chris Bacon (chrisbacon76@gmail.com)
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//
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// Copyright (C) 2010 Chris Bacon
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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;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using Mono.CodeContracts.Rewrite;
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using Mono.CodeContracts.Rewrite.Ast;
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using System.Diagnostics.Contracts;
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using Mono.Cecil;
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using Mono.CodeContracts.Rewrite.AstVisitors;
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using Mono.Cecil.Cil;
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namespace Mono.CodeContracts.Rewrite {
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class TransformContractsVisitor : ExprVisitor {
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public TransformContractsVisitor (ModuleDefinition module, MethodDefinition method, Dictionary<Expr, Instruction> instructionLookup, ContractsRuntime contractsRuntime)
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{
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//this.module = method.Module;
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this.instructionLookup = instructionLookup;
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this.contractsRuntime = contractsRuntime;
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this.methodInfo = new MethodInfo (module, method);
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}
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//private ModuleDefinition module;
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private Dictionary<Expr, Instruction> instructionLookup;
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private ContractsRuntime contractsRuntime;
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private MethodInfo methodInfo;
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private List<ContractRequiresInfo> contractRequiresInfo = new List<ContractRequiresInfo> ();
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public IEnumerable<ContractRequiresInfo> ContractRequiresInfo {
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get { return this.contractRequiresInfo; }
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}
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protected override Expr VisitCall (ExprCall e)
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{
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var call = (ExprCall)base.VisitCall (e);
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var method = e.Method;
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if (method.DeclaringType.FullName == "System.Diagnostics.Contracts.Contract") {
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switch (method.Name) {
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case "Requires":
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if (!method.HasGenericParameters) {
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switch (method.Parameters.Count) {
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case 1:
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return this.ProcessRequires1 (call);
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case 2:
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return this.ProcessRequires2 (call);
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default:
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throw new NotSupportedException ("Invalid number of parameters to Contract.Requires()");
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}
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} else {
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goto default;
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}
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default:
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throw new NotSupportedException ("Cannot handle Contract." + e.Method.Name + "()");
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}
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}
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return call;
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}
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private string GetConditionString (Expr e)
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{
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var vSource = new SourcePositionVisitor (this.instructionLookup);
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vSource.Visit (e);
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var extractor = new ConditionTextExtractor (vSource.SourceCodeFileName, vSource.StartPosition, vSource.EndPosition);
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return extractor.GetConditionText ();
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}
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private Expr ProcessRequires1 (ExprCall e)
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{
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MethodDefinition mRequires = this.contractsRuntime.GetRequires ();
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Expr conditionExpr = e.Parameters.First ();
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Expr nullArgExpr = new ExprLoadConstant (this.methodInfo, null);
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string conditionText = this.GetConditionString (e);
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Expr conditionStringExpr = new ExprLoadConstant (this.methodInfo, conditionText);
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var call = new ExprCall (this.methodInfo, mRequires, new Expr [] { conditionExpr, nullArgExpr, conditionStringExpr });
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this.contractRequiresInfo.Add (new ContractRequiresInfo (e, call));
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return call;
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}
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private Expr ProcessRequires2 (ExprCall e)
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{
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MethodDefinition mRequires = this.contractsRuntime.GetRequires ();
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Expr conditionExpr = e.Parameters.First ();
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Expr msgExpr = e.Parameters.ElementAt (1);
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string conditionText = this.GetConditionString (e);
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Expr conditionStringExpr = new ExprLoadConstant (this.methodInfo, conditionText);
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var call = new ExprCall (this.methodInfo, mRequires, new Expr [] { conditionExpr, msgExpr, conditionStringExpr });
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this.contractRequiresInfo.Add (new ContractRequiresInfo (e, call));
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return call;
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}
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}
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}
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