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using System;
using System.IO;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Text.RegularExpressions;
using System.Linq;
namespace Microsoft.Boogie.Houdini
{
public class ConcurrentHoudini : Houdini
{
int id;
// private static ConcurrentDictionary<RefutedAnnotation, int> refutedSharedAnnotations;
private static ConcurrentDictionary<string, RefutedAnnotation> refutedSharedAnnotations;
public ConcurrentHoudini(int id, Program program, HoudiniSession.HoudiniStatistics stats, string cexTraceFile = "houdiniCexTrace.bpl")
: base(program, stats, cexTraceFile)
{
this.id = id;
}
static ConcurrentHoudini()
{
refutedSharedAnnotations = new ConcurrentDictionary<string, RefutedAnnotation>();
}
public ConcurrentDictionary<string, RefutedAnnotation> RefutedSharedAnnotations { get { return refutedSharedAnnotations; } }
private bool ExchangeRefutedAnnotations()
{
int count = 0;
foreach (string key in refutedSharedAnnotations.Keys) {
KeyValuePair<Variable, bool> kv = currentHoudiniState.Assignment.FirstOrDefault(entry => entry.Key.Name.Equals(key) && entry.Value);
RefutedAnnotation ra = refutedSharedAnnotations[key];
if (kv.Key != null) {
if (CommandLineOptions.Clo.DebugParallelHoudini)
Console.WriteLine("(+) " + ra.Constant + "," + ra.Kind + "," + ra.CalleeProc + "," + ra.RefutationSite);
AddRelatedToWorkList(ra);
UpdateAssignment(ra);
count++;
}
}
if (CommandLineOptions.Clo.DebugParallelHoudini)
Console.WriteLine("# refuted annotations received from the shared exchanging set: " + count);
return count > 0 ? true : false;
}
protected override bool UpdateAssignmentWorkList(ProverInterface.Outcome outcome,
List<Counterexample> errors)
{
Contract.Assume(currentHoudiniState.Implementation != null);
bool dequeue = true;
switch (outcome) {
case ProverInterface.Outcome.Valid:
//yeah, dequeue
break;
case ProverInterface.Outcome.Invalid:
Contract.Assume(errors != null);
foreach (Counterexample error in errors) {
RefutedAnnotation refutedAnnotation = ExtractRefutedAnnotation(error);
// some candidate annotation removed
if (refutedAnnotation != null) {
if (CommandLineOptions.Clo.HoudiniShareRefutedCandidates)
refutedSharedAnnotations.TryAdd (refutedAnnotation.Constant.Name, refutedAnnotation);
AddRelatedToWorkList(refutedAnnotation);
UpdateAssignment(refutedAnnotation);
dequeue = false;
#region Extra debugging output
if (CommandLineOptions.Clo.Trace) {
using (var cexWriter = new System.IO.StreamWriter(cexTraceFile, true)) {
cexWriter.WriteLine("Counter example for " + refutedAnnotation.Constant);
cexWriter.Write(error.ToString());
cexWriter.WriteLine();
using (var writer = new Microsoft.Boogie.TokenTextWriter(cexWriter))
foreach (Microsoft.Boogie.Block blk in error.Trace)
blk.Emit(writer, 15);
//cexWriter.WriteLine();
}
}
#endregion
}
}
if (CommandLineOptions.Clo.DebugParallelHoudini)
Console.WriteLine("# exchange set size: " + refutedSharedAnnotations.Count);
if (CommandLineOptions.Clo.HoudiniShareRefutedCandidates)
if (ExchangeRefutedAnnotations()) dequeue = false;
break;
default:
if (CommandLineOptions.Clo.Trace) {
Console.WriteLine("Timeout/Spaceout while verifying " + currentHoudiniState.Implementation.Name);
}
HoudiniSession houdiniSession;
houdiniSessions.TryGetValue(currentHoudiniState.Implementation, out houdiniSession);
foreach (Variable v in houdiniSession.houdiniAssertConstants) {
if (CommandLineOptions.Clo.Trace) {
Console.WriteLine("Removing " + v);
}
currentHoudiniState.Assignment.Remove(v);
currentHoudiniState.Assignment.Add(v, false);
this.NotifyConstant(v.Name);
}
currentHoudiniState.addToBlackList(currentHoudiniState.Implementation.Name);
break;
}
return dequeue;
}
public override HoudiniOutcome PerformHoudiniInference(int stage = 0,
IEnumerable<int> completedStages = null,
Dictionary<string, bool> initialAssignment = null)
{
this.NotifyStart(program, houdiniConstants.Count);
currentHoudiniState = new HoudiniState(BuildWorkList(program), BuildAssignment(houdiniConstants));
if(initialAssignment != null) {
foreach(var v in currentHoudiniState.Assignment.Keys.ToList()) {
currentHoudiniState.Assignment[v] = initialAssignment[v.Name];
}
}
foreach (Implementation impl in vcgenFailures) {
currentHoudiniState.addToBlackList(impl.Name);
}
while (currentHoudiniState.WorkQueue.Count > 0) {
this.NotifyIteration();
if (CommandLineOptions.Clo.HoudiniShareRefutedCandidates)
ExchangeRefutedAnnotations();
currentHoudiniState.Implementation = currentHoudiniState.WorkQueue.Peek();
this.NotifyImplementation(currentHoudiniState.Implementation);
HoudiniSession session;
this.houdiniSessions.TryGetValue(currentHoudiniState.Implementation, out session);
HoudiniVerifyCurrent(session, stage, completedStages);
}
this.NotifyEnd(true);
Dictionary<string, bool> assignment = new Dictionary<string, bool>();
foreach (var x in currentHoudiniState.Assignment)
assignment[x.Key.Name] = x.Value;
currentHoudiniState.Outcome.assignment = assignment;
return currentHoudiniState.Outcome;
}
protected override void HoudiniVerifyCurrent(HoudiniSession session, int stage, IEnumerable<int> completedStages)
{
while (true) {
this.NotifyAssignment(currentHoudiniState.Assignment);
//check the VC with the current assignment
List<Counterexample> errors;
ProverInterface.Outcome outcome = TryCatchVerify(session, stage, completedStages, out errors);
this.NotifyOutcome(outcome);
Console.WriteLine("***ERROR with id {0} --- {1}***", id, errors.Count);
DebugRefutedCandidates(currentHoudiniState.Implementation, errors);
#region Explain Houdini
if (CommandLineOptions.Clo.ExplainHoudini && outcome == ProverInterface.Outcome.Invalid)
{
Contract.Assume(errors != null);
// make a copy of this variable
errors = new List<Counterexample>(errors);
var refutedAnnotations = new List<RefutedAnnotation>();
foreach (Counterexample error in errors)
{
RefutedAnnotation refutedAnnotation = ExtractRefutedAnnotation(error);
if (refutedAnnotation == null || refutedAnnotation.Kind == RefutedAnnotationKind.ASSERT) continue;
refutedAnnotations.Add(refutedAnnotation);
}
foreach (var refutedAnnotation in refutedAnnotations)
{
session.Explain(proverInterface, currentHoudiniState.Assignment, refutedAnnotation.Constant);
}
}
#endregion
if (UpdateHoudiniOutcome(currentHoudiniState.Outcome, currentHoudiniState.Implementation, outcome, errors)) { // abort
currentHoudiniState.WorkQueue.Dequeue();
this.NotifyDequeue();
FlushWorkList(stage, completedStages);
return;
}
else if (UpdateAssignmentWorkList(outcome, errors)) {
if (CommandLineOptions.Clo.UseUnsatCoreForContractInfer && outcome == ProverInterface.Outcome.Valid)
session.UpdateUnsatCore(proverInterface, currentHoudiniState.Assignment);
currentHoudiniState.WorkQueue.Dequeue();
this.NotifyDequeue();
return;
}
}
}
}
}
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