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SplitAndVerifyWorker.cs
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SplitAndVerifyWorker.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Boogie;
using static VC.ConditionGeneration;
namespace VC
{
class SplitAndVerifyWorker
{
private readonly CommandLineOptions options;
private readonly VerifierCallback callback;
private readonly ModelViewInfo mvInfo;
private readonly Implementation implementation;
private readonly int maxKeepGoingSplits;
private readonly List<Split> manualSplits;
private double maxVcCost;
private readonly bool splitOnEveryAssert;
private bool DoSplitting => manualSplits.Count > 1 || KeepGoing || splitOnEveryAssert;
private bool TrackingProgress => DoSplitting && (callback.OnProgress != null || options.Trace);
private bool KeepGoing => maxKeepGoingSplits > 1;
private Outcome outcome;
private double remainingCost;
private double provenCost;
private int total;
private int splitNumber;
private int totalResourceCount;
public SplitAndVerifyWorker(CommandLineOptions options, VCGen vcGen, Implementation implementation,
Dictionary<TransferCmd, ReturnCmd> gotoCmdOrigins, VerifierCallback callback, ModelViewInfo mvInfo,
Outcome outcome)
{
this.options = options;
this.callback = callback;
this.mvInfo = mvInfo;
this.implementation = implementation;
this.outcome = outcome;
var maxSplits = options.VcsMaxSplits;
VCGen.CheckIntAttributeOnImpl(implementation, "vcs_max_splits", ref maxSplits);
maxKeepGoingSplits = options.VcsMaxKeepGoingSplits;
VCGen.CheckIntAttributeOnImpl(implementation, "vcs_max_keep_going_splits", ref maxKeepGoingSplits);
maxVcCost = options.VcsMaxCost;
var tmpMaxVcCost = -1;
VCGen.CheckIntAttributeOnImpl(implementation, "vcs_max_cost", ref tmpMaxVcCost);
if (tmpMaxVcCost >= 0)
{
maxVcCost = tmpMaxVcCost;
}
splitOnEveryAssert = options.VcsSplitOnEveryAssert;
implementation.CheckBooleanAttribute("vcs_split_on_every_assert", ref splitOnEveryAssert);
ResetPredecessors(implementation.Blocks);
manualSplits = Split.FocusAndSplit(implementation, gotoCmdOrigins, vcGen, splitOnEveryAssert);
if (manualSplits.Count == 1 && maxSplits > 1) {
manualSplits = Split.DoSplit(manualSplits[0], maxVcCost, maxSplits);
maxVcCost = 1.0;
}
splitNumber = DoSplitting ? 0 : -1;
}
public async Task<Outcome> WorkUntilDone()
{
TrackSplitsCost(manualSplits);
await Task.WhenAll(manualSplits.Select(DoWork));
return outcome;
}
public int ResourceCount => totalResourceCount;
private void TrackSplitsCost(List<Split> splits)
{
if (!TrackingProgress)
{
return;
}
foreach (var split in splits) {
remainingCost += split.Cost;
total++;
}
}
async Task DoWork(Split split)
{
var checker = await split.parent.CheckerPool.FindCheckerFor(split.parent, split);
try {
StartCheck(split, checker);
await split.ProverTask;
await ProcessResult(split);
}
catch {
split.ReleaseChecker();
}
}
private void StartCheck(Split split, Checker checker)
{
int currentSplitNumber = DoSplitting ? Interlocked.Increment(ref splitNumber) - 1 : -1;
if (options.Trace && DoSplitting) {
Console.WriteLine(" checking split {1}/{2}, {3:0.00}%, {0} ...",
split.Stats, currentSplitNumber + 1, total, 100 * provenCost / (provenCost + remainingCost));
}
if (options.XmlSink != null && DoSplitting) {
options.XmlSink.WriteStartSplit(currentSplitNumber + 1, DateTime.UtcNow);
}
callback.OnProgress?.Invoke("VCprove", currentSplitNumber, total,
provenCost / (remainingCost + provenCost));
var timeout = KeepGoing && split.LastChance ? options.VcsFinalAssertTimeout :
KeepGoing ? options.VcsKeepGoingTimeout :
implementation.TimeLimit;
split.BeginCheck(checker, callback, mvInfo, currentSplitNumber, timeout, implementation.ResourceLimit);
}
private async Task ProcessResult(Split split)
{
if (TrackingProgress) {
lock (this) {
remainingCost -= split.Cost;
}
}
split.ReadOutcome(ref outcome, out var proverFailed, ref totalResourceCount);
if (TrackingProgress) {
lock (this) {
if (proverFailed) {
// even if the prover fails, we have learned something, i.e., it is
// annoying to watch Boogie say Timeout, 0.00% a couple of times
provenCost += split.Cost / 100;
} else {
provenCost += split.Cost;
}
}
}
callback.OnProgress?.Invoke("VCprove", splitNumber < 0 ? 0 : splitNumber, total, provenCost / (remainingCost + provenCost));
if (!proverFailed) {
split.ReleaseChecker();
return;
}
var newTasks = HandleProverFailure(split);
split.ReleaseChecker(); // Can only be released after the synchronous part of HandleProverFailure.
await newTasks;
}
private async Task HandleProverFailure(Split split)
{
if (split.LastChance) {
string msg = "some timeout";
if (split.reporter is { resourceExceededMessage: { } }) {
msg = split.reporter.resourceExceededMessage;
}
callback.OnCounterexample(split.ToCounterexample(split.Checker.TheoremProver.Context), msg);
outcome = Outcome.Errors;
return;
}
if (maxKeepGoingSplits > 1) {
var newSplits = Split.DoSplit(split, maxVcCost, maxKeepGoingSplits);
Contract.Assert(newSplits != null);
maxVcCost = 1.0; // for future
TrackSplitsCost(newSplits);
if (outcome != Outcome.Errors) {
outcome = Outcome.Correct;
}
await Task.WhenAll(newSplits.Select(DoWork));
return;
}
Contract.Assert(outcome != Outcome.Correct);
if (outcome == Outcome.TimedOut) {
string msg = "some timeout";
if (split.reporter is { resourceExceededMessage: { } }) {
msg = split.reporter.resourceExceededMessage;
}
callback.OnTimeout(msg);
} else if (outcome == Outcome.OutOfMemory) {
string msg = "out of memory";
if (split.reporter is { resourceExceededMessage: { } }) {
msg = split.reporter.resourceExceededMessage;
}
callback.OnOutOfMemory(msg);
} else if (outcome == Outcome.OutOfResource) {
string msg = "out of resource";
if (split.reporter is { resourceExceededMessage: { } }) {
msg = split.reporter.resourceExceededMessage;
}
callback.OnOutOfResource(msg);
}
}
}
}