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