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//
// Checker.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;
using System.Collections.Generic;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.Analysis.Drivers;
using Mono.CodeContracts.Static.Analysis.HeapAnalysis;
using Mono.CodeContracts.Static.Analysis.NonNull;
using Mono.CodeContracts.Static.Analysis.Numerical;
using Mono.CodeContracts.Static.ControlFlow;
using Mono.CodeContracts.Static.Providers;
using Mono.CodeContracts.Static.Proving;
namespace Mono.CodeContracts.Static {
public class Checker {
private readonly CheckOptions options;
private CodeContractsAnalysisDriver<IMethodResult<SymbolicValue>> analysis_driver;
private Dictionary<string, IMethodAnalysis> analyzers;
private Checker (CheckOptions options)
{
this.options = options;
}
public static CheckResults Check (CheckOptions options)
{
var checker = new Checker (options);
return checker.Analyze ();
}
private CheckResults Analyze ()
{
if (this.options.Assembly == null)
return CheckResults.Error ("No assembly given to check");
DebugOptions.Debug = this.options.ShowDebug;
this.analyzers = new Dictionary<string, IMethodAnalysis> {
{"non-null", new NonNullAnalysisFacade ()},
{"arithmetic", new Analysers.Arithmetic ()}
};
this.analysis_driver = new CodeContractsAnalysisDriver<IMethodResult<SymbolicValue>> (
new BasicAnalysisDriver (MetaDataProvider.Instance, CodeContractDecoder.Instance));
return AnalyzeAssembly (this.options.Assembly);
}
private CheckResults AnalyzeAssembly (string assemblyPath)
{
IMetaDataProvider metadataDecoder = this.analysis_driver.MetaDataProvider;
AssemblyNode assembly;
string reason;
if (!metadataDecoder.TryLoadAssembly (assemblyPath, out assembly, out reason))
return CheckResults.Error (string.Format ("Cannot load assembly: {0}", reason));
var proofResults = new Dictionary<string, ICollection<string>> ();
foreach (Method method in metadataDecoder.Methods (assembly))
AnalyzeMethod (method, proofResults);
if (proofResults.Count == 0)
return CheckResults.Error ("No methods found.");
return new CheckResults (null, null, proofResults);
}
private void AnalyzeMethod (Method method, Dictionary<string, ICollection<string>> proofResults)
{
IMetaDataProvider metadataDecoder = this.analysis_driver.MetaDataProvider;
if (!metadataDecoder.HasBody (method))
return;
if (this.options.Method != null && !metadataDecoder.FullName (method).Contains (this.options.Method))
return;
var results = new List<string> ();
proofResults.Add (method.FullName, results);
try {
AnalyzeMethodInternal (method, results);
} catch (Exception e) {
results.Add ("Exception: " + e.Message);
return;
}
results.Add (string.Format ("Checked {0} assertions", results.Count));
}
private void AnalyzeMethodInternal (Method method, List<string> proofResults)
{
string fullMethodName = method.FullName;
IMethodDriver<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> methodDriver = this.analysis_driver.CreateMethodDriver (method);
methodDriver.RunHeapAndExpressionAnalyses ();
var results = new List<IMethodResult<SymbolicValue>> (this.analyzers.Values.Count);
foreach (IMethodAnalysis analysis in this.analyzers.Values) {
IMethodResult<SymbolicValue> result = analysis.Analyze (fullMethodName, methodDriver);
results.Add (result);
}
ComposedFactQuery<SymbolicValue> facts = CreateFactQuery (methodDriver.BasicFacts.IsUnreachable, results);
foreach (var methodResult in results)
methodResult.ValidateImplicitAssertions (facts, proofResults);
AssertionFinder.ValidateAssertions (facts, methodDriver, proofResults);
}
private ComposedFactQuery<Variable> CreateFactQuery<Variable> (Predicate<APC> isUnreachable, IEnumerable<IMethodResult<Variable>> results)
{
var res = new ComposedFactQuery<Variable> (isUnreachable);
res.Add (new ConstantPropagationFactQuery<Variable> ());
foreach (var methodResult in results)
res.Add (methodResult.FactQuery);
return res;
}
}
}
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