diff options
Diffstat (limited to 'Source/ExecutionEngine')
-rw-r--r-- | Source/ExecutionEngine/ExecutionEngine.cs | 3586 | ||||
-rw-r--r-- | Source/ExecutionEngine/ExecutionEngine.csproj | 386 | ||||
-rw-r--r-- | Source/ExecutionEngine/Properties/AssemblyInfo.cs | 72 | ||||
-rw-r--r-- | Source/ExecutionEngine/VerificationResultCache.cs | 1332 |
4 files changed, 2747 insertions, 2629 deletions
diff --git a/Source/ExecutionEngine/ExecutionEngine.cs b/Source/ExecutionEngine/ExecutionEngine.cs index 31a69c6e..9bc855be 100644 --- a/Source/ExecutionEngine/ExecutionEngine.cs +++ b/Source/ExecutionEngine/ExecutionEngine.cs @@ -1,1760 +1,1826 @@ -using System;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Diagnostics.Contracts;
-using System.IO;
-using System.Linq;
-using System.Text.RegularExpressions;
-using System.Threading;
-using System.Threading.Tasks;
-using VC;
-using BoogiePL = Microsoft.Boogie;
-using System.Diagnostics;
-using System.Runtime.Caching;
-
-namespace Microsoft.Boogie
-{
-
- #region Output printing
-
- public interface OutputPrinter
- {
- void ErrorWriteLine(TextWriter tw, string s);
- void ErrorWriteLine(TextWriter tw, string format, params object[] args);
- void AdvisoryWriteLine(string format, params object[] args);
- void Inform(string s, TextWriter tw);
- void WriteTrailer(PipelineStatistics stats);
- void WriteErrorInformation(ErrorInformation errorInfo, TextWriter tw, bool skipExecutionTrace = true);
- void ReportBplError(IToken tok, string message, bool error, TextWriter tw, string category = null);
- }
-
-
- public class ConsolePrinter : OutputPrinter
- {
- public void ErrorWriteLine(TextWriter tw, string s)
- {
- Contract.Requires(s != null);
- if (!s.Contains("Error: ") && !s.Contains("Error BP"))
- {
- tw.WriteLine(s);
- return;
- }
-
- // split the string up into its first line and the remaining lines
- string remaining = null;
- int i = s.IndexOf('\r');
- if (0 <= i)
- {
- remaining = s.Substring(i + 1);
- if (remaining.StartsWith("\n"))
- {
- remaining = remaining.Substring(1);
- }
- s = s.Substring(0, i);
- }
-
- ConsoleColor col = Console.ForegroundColor;
- Console.ForegroundColor = ConsoleColor.Red;
- tw.WriteLine(s);
- Console.ForegroundColor = col;
-
- if (remaining != null)
- {
- tw.WriteLine(remaining);
- }
- }
-
-
- public void ErrorWriteLine(TextWriter tw, string format, params object[] args)
- {
- Contract.Requires(format != null);
- string s = string.Format(format, args);
- ErrorWriteLine(tw, s);
- }
-
-
- public void AdvisoryWriteLine(string format, params object[] args)
- {
- Contract.Requires(format != null);
- ConsoleColor col = Console.ForegroundColor;
- Console.ForegroundColor = ConsoleColor.Yellow;
- Console.WriteLine(format, args);
- Console.ForegroundColor = col;
- }
-
-
- /// <summary>
- /// Inform the user about something and proceed with translation normally.
- /// Print newline after the message.
- /// </summary>
- public void Inform(string s, TextWriter tw)
- {
- if (CommandLineOptions.Clo.Trace || CommandLineOptions.Clo.TraceProofObligations)
- {
- tw.WriteLine(s);
- }
- }
-
-
- public void WriteTrailer(PipelineStatistics stats)
- {
- Contract.Requires(stats != null);
- Contract.Requires(0 <= stats.VerifiedCount && 0 <= stats.ErrorCount && 0 <= stats.InconclusiveCount && 0 <= stats.TimeoutCount && 0 <= stats.OutOfMemoryCount);
-
- Console.WriteLine();
- if (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed)
- {
- Console.Write("{0} finished with {1} credible, {2} doomed{3}", CommandLineOptions.Clo.DescriptiveToolName, stats.VerifiedCount, stats.ErrorCount, stats.ErrorCount == 1 ? "" : "s");
- }
- else
- {
- Console.Write("{0} finished with {1} verified, {2} error{3}", CommandLineOptions.Clo.DescriptiveToolName, stats.VerifiedCount, stats.ErrorCount, stats.ErrorCount == 1 ? "" : "s");
- }
- if (stats.InconclusiveCount != 0)
- {
- Console.Write(", {0} inconclusive{1}", stats.InconclusiveCount, stats.InconclusiveCount == 1 ? "" : "s");
- }
- if (stats.TimeoutCount != 0)
- {
- Console.Write(", {0} time out{1}", stats.TimeoutCount, stats.TimeoutCount == 1 ? "" : "s");
- }
- if (stats.OutOfMemoryCount != 0)
- {
- Console.Write(", {0} out of memory", stats.OutOfMemoryCount);
- }
- Console.WriteLine();
- Console.Out.Flush();
- }
-
-
- public void WriteErrorInformation(ErrorInformation errorInfo, TextWriter tw, bool skipExecutionTrace = true)
- {
- Contract.Requires(errorInfo != null);
-
- ReportBplError(errorInfo.Tok, errorInfo.FullMsg, true, tw);
-
- foreach (var e in errorInfo.Aux)
- {
- if (!(skipExecutionTrace && e.Category.Contains("Execution trace")))
- {
- ReportBplError(e.Tok, e.FullMsg, false, tw);
- }
- }
-
- tw.Write(errorInfo.Out.ToString());
- tw.Write(errorInfo.Model.ToString());
- tw.Flush();
- }
-
-
- public virtual void ReportBplError(IToken tok, string message, bool error, TextWriter tw, string category = null)
- {
- Contract.Requires(message != null);
-
- if (category != null)
- {
- message = string.Format("{0}: {1}", category, message);
- }
- string s;
- if (tok != null)
- {
- s = string.Format("{0}({1},{2}): {3}", ExecutionEngine.GetFileNameForConsole(tok.filename), tok.line, tok.col, message);
- }
- else
- {
- s = message;
- }
- if (error)
- {
- ErrorWriteLine(tw, s);
- }
- else
- {
- tw.WriteLine(s);
- }
- }
- }
-
- #endregion
-
-
- public enum PipelineOutcome
- {
- Done,
- ResolutionError,
- TypeCheckingError,
- ResolvedAndTypeChecked,
- FatalError,
- VerificationCompleted
- }
-
-
- public class PipelineStatistics
- {
- public int ErrorCount;
- public int VerifiedCount;
- public int InconclusiveCount;
- public int TimeoutCount;
- public int OutOfMemoryCount;
- public long[] CachingActionCounts;
- public int CachedErrorCount;
- public int CachedVerifiedCount;
- public int CachedInconclusiveCount;
- public int CachedTimeoutCount;
- public int CachedOutOfMemoryCount;
- }
-
-
- #region Error reporting
-
- public delegate void ErrorReporterDelegate(ErrorInformation errInfo);
-
-
- public enum ErrorKind
- {
- Assertion,
- Precondition,
- Postcondition,
- InvariantEntry,
- InvariantMaintainance
- }
-
-
- public class ErrorInformationFactory
- {
- public virtual ErrorInformation CreateErrorInformation(IToken tok, string msg, string requestId = null, string originalRequestId = null, string category = null)
- {
- Contract.Requires(1 <= tok.line && 1 <= tok.col);
- Contract.Requires(msg != null);
-
- return ErrorInformation.CreateErrorInformation(tok, msg, requestId, originalRequestId, category);
- }
- }
-
-
- public class ErrorInformation
- {
- public readonly IToken Tok;
- public string Msg;
- public string Category { get; set; }
- public string BoogieErrorCode { get; set; }
- public readonly List<AuxErrorInfo> Aux = new List<AuxErrorInfo>();
- public string OriginalRequestId { get; set; }
- public string RequestId { get; set; }
- public ErrorKind Kind { get; set; }
- public string ImplementationName { get; set; }
- public TextWriter Out = new StringWriter();
- public TextWriter Model = new StringWriter();
-
- public string FullMsg
- {
- get
- {
- var prefix = Category;
- if (BoogieErrorCode != null)
- {
- prefix = prefix == null ? BoogieErrorCode : prefix + " " + BoogieErrorCode;
- }
- return prefix != null ? string.Format("{0}: {1}", prefix, Msg) : Msg;
- }
- }
-
- public struct AuxErrorInfo
- {
- public readonly IToken Tok;
- public readonly string Msg;
- public readonly string Category;
-
- public string FullMsg
- {
- get
- {
- return Category != null ? string.Format("{0}: {1}", Category, Msg) : Msg;
- }
- }
-
- public AuxErrorInfo(IToken tok, string msg, string category = null)
- {
- Tok = tok;
- Msg = CleanUp(msg);
- Category = category;
- }
- }
-
- protected ErrorInformation(IToken tok, string msg)
- {
- Contract.Requires(tok != null);
- Contract.Requires(1 <= tok.line && 1 <= tok.col);
- Contract.Requires(msg != null);
-
- Tok = tok;
- Msg = CleanUp(msg);
- }
-
- internal static ErrorInformation CreateErrorInformation(IToken tok, string msg, string requestId = null, string originalRequestId = null, string category = null)
- {
- var result = new ErrorInformation(tok, msg);
- result.RequestId = requestId;
- result.OriginalRequestId = originalRequestId;
- result.Category = category;
- return result;
- }
-
- public virtual void AddAuxInfo(IToken tok, string msg, string category = null)
- {
- Contract.Requires(tok != null);
- Contract.Requires(1 <= tok.line && 1 <= tok.col);
- Contract.Requires(msg != null);
- Aux.Add(new AuxErrorInfo(tok, msg, category));
- }
-
- protected static string CleanUp(string msg)
- {
- if (msg.ToLower().StartsWith("error: "))
- {
- return msg.Substring(7);
- }
- else
- {
- return msg;
- }
- }
- }
-
- #endregion
-
-
- public sealed class VerificationResult
- {
- public readonly string RequestId;
- public readonly string Checksum;
- public readonly string DependeciesChecksum;
- public readonly string ImplementationName;
- public readonly IToken ImplementationToken;
- public readonly string ProgramId;
-
- public DateTime Start { get; set; }
- public DateTime End { get; set; }
-
- public int ProofObligationCount { get { return ProofObligationCountAfter - ProofObligationCountBefore; } }
- public int ProofObligationCountBefore { get; set; }
- public int ProofObligationCountAfter { get; set; }
-
- public ConditionGeneration.Outcome Outcome { get; set; }
- public List<Counterexample> Errors;
-
- public ISet<byte[]> AssertionChecksums { get; private set; }
-
- public VerificationResult(string requestId, Implementation implementation, string programId = null)
- {
- Checksum = implementation.Checksum;
- DependeciesChecksum = implementation.DependencyChecksum;
- RequestId = requestId;
- ImplementationName = implementation.Name;
- ImplementationToken = implementation.tok;
- ProgramId = programId;
- AssertionChecksums = implementation.AssertionChecksums;
- }
- }
-
-
- public class PolymorphismChecker : ReadOnlyVisitor
- {
- bool isMonomorphic = true;
-
- public override DeclWithFormals VisitDeclWithFormals(DeclWithFormals node)
- {
- if (node.TypeParameters.Count > 0)
- isMonomorphic = false;
- return base.VisitDeclWithFormals(node);
- }
-
- public override BinderExpr VisitBinderExpr(BinderExpr node)
- {
- if (node.TypeParameters.Count > 0)
- isMonomorphic = false;
- return base.VisitBinderExpr(node);
- }
-
- public override MapType VisitMapType(MapType node)
- {
- if (node.TypeParameters.Count > 0)
- isMonomorphic = false;
- return base.VisitMapType(node);
- }
-
- public override Expr VisitNAryExpr(NAryExpr node)
- {
- BinaryOperator op = node.Fun as BinaryOperator;
- if (op != null && op.Op == BinaryOperator.Opcode.Subtype)
- isMonomorphic = false;
- return base.VisitNAryExpr(node);
- }
-
- public static bool IsMonomorphic(Program program)
- {
- var checker = new PolymorphismChecker();
- checker.VisitProgram(program);
- return checker.isMonomorphic;
- }
- }
-
- public class ExecutionEngine
- {
- public static OutputPrinter printer;
-
- public static ErrorInformationFactory errorInformationFactory = new ErrorInformationFactory();
-
- static int autoRequestIdCount;
-
- static readonly string AutoRequestIdPrefix = "auto_request_id_";
-
- public static string FreshRequestId()
- {
- var id = Interlocked.Increment(ref autoRequestIdCount);
- return AutoRequestIdPrefix + id;
- }
-
- public static int AutoRequestId(string id)
- {
- if (id.StartsWith(AutoRequestIdPrefix))
- {
- int result;
- if (int.TryParse(id.Substring(AutoRequestIdPrefix.Length), out result))
- {
- return result;
- }
- }
- return -1;
- }
-
- public readonly static VerificationResultCache Cache = new VerificationResultCache();
-
- static readonly MemoryCache programCache = new MemoryCache("ProgramCache");
- static readonly CacheItemPolicy policy = new CacheItemPolicy { SlidingExpiration = new TimeSpan(0, 10, 0), Priority = CacheItemPriority.Default };
-
- public static Program CachedProgram(string programId)
- {
- var result = programCache.Get(programId) as Program;
- return result;
- }
-
- static List<Checker> Checkers = new List<Checker>();
-
- static DateTime FirstRequestStart;
-
- static readonly ConcurrentDictionary<string, TimeSpan> TimePerRequest = new ConcurrentDictionary<string, TimeSpan>();
- static readonly ConcurrentDictionary<string, PipelineStatistics> StatisticsPerRequest = new ConcurrentDictionary<string, PipelineStatistics>();
-
- static readonly ConcurrentDictionary<string, CancellationTokenSource> ImplIdToCancellationTokenSource = new ConcurrentDictionary<string, CancellationTokenSource>();
-
- static readonly ConcurrentDictionary<string, CancellationTokenSource> RequestIdToCancellationTokenSource = new ConcurrentDictionary<string, CancellationTokenSource>();
-
- public static void ProcessFiles(List<string> fileNames, bool lookForSnapshots = true, string programId = null)
- {
- Contract.Requires(cce.NonNullElements(fileNames));
-
- if (programId == null)
- {
- programId = "main_program_id";
- }
-
- if (CommandLineOptions.Clo.VerifySeparately && 1 < fileNames.Count)
- {
- foreach (var f in fileNames)
- {
- ProcessFiles(new List<string> { f }, lookForSnapshots, f);
- }
- return;
- }
-
- if (0 <= CommandLineOptions.Clo.VerifySnapshots && lookForSnapshots)
- {
- var snapshotsByVersion = LookForSnapshots(fileNames);
- foreach (var s in snapshotsByVersion)
- {
- ProcessFiles(new List<string>(s), false, programId);
- }
- return;
- }
-
- using (XmlFileScope xf = new XmlFileScope(CommandLineOptions.Clo.XmlSink, fileNames[fileNames.Count - 1]))
- {
- Program program = ParseBoogieProgram(fileNames, false);
- if (program == null)
- return;
- if (CommandLineOptions.Clo.PrintFile != null)
- {
- PrintBplFile(CommandLineOptions.Clo.PrintFile, program, false, true, CommandLineOptions.Clo.PrettyPrint);
- }
-
- LinearTypeChecker linearTypeChecker;
- MoverTypeChecker moverTypeChecker;
- PipelineOutcome oc = ResolveAndTypecheck(program, fileNames[fileNames.Count - 1], out linearTypeChecker, out moverTypeChecker);
- if (oc != PipelineOutcome.ResolvedAndTypeChecked)
- return;
-
- if (CommandLineOptions.Clo.PrintCFGPrefix != null)
- {
- foreach (var impl in program.Implementations)
- {
- using (StreamWriter sw = new StreamWriter(CommandLineOptions.Clo.PrintCFGPrefix + "." + impl.Name + ".dot"))
- {
- sw.Write(program.ProcessLoops(impl).ToDot());
- }
- }
- }
-
- if (CommandLineOptions.Clo.StratifiedInlining == 0)
- {
- Concurrency.Transform(linearTypeChecker, moverTypeChecker);
- (new LinearEraser()).VisitProgram(program);
- if (CommandLineOptions.Clo.OwickiGriesDesugaredOutputFile != null)
- {
- int oldPrintUnstructured = CommandLineOptions.Clo.PrintUnstructured;
- CommandLineOptions.Clo.PrintUnstructured = 1;
- PrintBplFile(CommandLineOptions.Clo.OwickiGriesDesugaredOutputFile, program, false, false, CommandLineOptions.Clo.PrettyPrint);
- CommandLineOptions.Clo.PrintUnstructured = oldPrintUnstructured;
- }
- }
-
- EliminateDeadVariables(program);
-
- CoalesceBlocks(program);
-
- Inline(program);
-
- var stats = new PipelineStatistics();
- oc = InferAndVerify(program, stats, 1 < CommandLineOptions.Clo.VerifySnapshots ? programId : null);
- switch (oc)
- {
- case PipelineOutcome.Done:
- case PipelineOutcome.VerificationCompleted:
- printer.WriteTrailer(stats);
- break;
- default:
- break;
- }
- }
- }
-
- public static IList<IList<string>> LookForSnapshots(IList<string> fileNames)
- {
- Contract.Requires(fileNames != null);
-
- var result = new List<IList<string>>();
- for (int version = 0; true; version++)
- {
- var nextSnapshot = new List<string>();
- foreach (var name in fileNames)
- {
- var versionedName = name.Replace(Path.GetExtension(name), ".v" + version + Path.GetExtension(name));
- if (File.Exists(versionedName))
- {
- nextSnapshot.Add(versionedName);
- }
- }
- if (nextSnapshot.Any())
- {
- result.Add(nextSnapshot);
- }
- else
- {
- break;
- }
- }
- return result;
- }
-
-
- public static void CoalesceBlocks(Program program)
- {
- if (CommandLineOptions.Clo.CoalesceBlocks)
- {
- if (CommandLineOptions.Clo.Trace)
- Console.WriteLine("Coalescing blocks...");
- Microsoft.Boogie.BlockCoalescer.CoalesceBlocks(program);
- }
- }
-
-
- public static void CollectModSets(Program program)
- {
- if (CommandLineOptions.Clo.DoModSetAnalysis)
- {
- new ModSetCollector().DoModSetAnalysis(program);
- }
- }
-
-
- public static void EliminateDeadVariables(Program program)
- {
- Microsoft.Boogie.UnusedVarEliminator.Eliminate(program);
- }
-
-
- public static void PrintBplFile(string filename, Program program, bool allowPrintDesugaring, bool setTokens = true, bool pretty = false)
- {
- Contract.Requires(program != null);
- Contract.Requires(filename != null);
- bool oldPrintDesugaring = CommandLineOptions.Clo.PrintDesugarings;
- if (!allowPrintDesugaring)
- {
- CommandLineOptions.Clo.PrintDesugarings = false;
- }
- using (TokenTextWriter writer = filename == "-" ?
- new TokenTextWriter("<console>", Console.Out, setTokens, pretty) :
- new TokenTextWriter(filename, setTokens, pretty))
- {
- if (CommandLineOptions.Clo.ShowEnv != CommandLineOptions.ShowEnvironment.Never)
- {
- writer.WriteLine("// " + CommandLineOptions.Clo.Version);
- writer.WriteLine("// " + CommandLineOptions.Clo.Environment);
- }
- writer.WriteLine();
- program.Emit(writer);
- }
- CommandLineOptions.Clo.PrintDesugarings = oldPrintDesugaring;
- }
-
-
- /// <summary>
- /// Parse the given files into one Boogie program. If an I/O or parse error occurs, an error will be printed
- /// and null will be returned. On success, a non-null program is returned.
- /// </summary>
- public static Program ParseBoogieProgram(List<string> fileNames, bool suppressTraceOutput)
- {
- Contract.Requires(cce.NonNullElements(fileNames));
-
- Program program = null;
- bool okay = true;
- for (int fileId = 0; fileId < fileNames.Count; fileId++)
- {
- string bplFileName = fileNames[fileId];
- if (!suppressTraceOutput)
- {
- if (CommandLineOptions.Clo.XmlSink != null)
- {
- CommandLineOptions.Clo.XmlSink.WriteFileFragment(bplFileName);
- }
- if (CommandLineOptions.Clo.Trace)
- {
- Console.WriteLine("Parsing " + GetFileNameForConsole(bplFileName));
- }
- }
-
- Program programSnippet;
- int errorCount;
- try
- {
- var defines = new List<string>() { "FILE_" + fileId };
- errorCount = Parser.Parse(bplFileName, defines, out programSnippet, CommandLineOptions.Clo.UseBaseNameForFileName);
- if (programSnippet == null || errorCount != 0)
- {
- Console.WriteLine("{0} parse errors detected in {1}", errorCount, GetFileNameForConsole(bplFileName));
- okay = false;
- continue;
- }
- }
- catch (IOException e)
- {
- printer.ErrorWriteLine(Console.Out, "Error opening file \"{0}\": {1}", GetFileNameForConsole(bplFileName), e.Message);
- okay = false;
- continue;
- }
- if (program == null)
- {
- program = programSnippet;
- }
- else if (programSnippet != null)
- {
- program.AddTopLevelDeclarations(programSnippet.TopLevelDeclarations);
- }
- }
- if (!okay)
- {
- return null;
- }
- else if (program == null)
- {
- return new Program();
- }
- else
- {
- return program;
- }
- }
-
- internal static string GetFileNameForConsole(string filename)
- {
- return (CommandLineOptions.Clo.UseBaseNameForFileName && !string.IsNullOrEmpty(filename) && filename != "<console>") ? System.IO.Path.GetFileName(filename) : filename;
- }
-
-
- /// <summary>
- /// Resolves and type checks the given Boogie program. Any errors are reported to the
- /// console. Returns:
- /// - Done if no errors occurred, and command line specified no resolution or no type checking.
- /// - ResolutionError if a resolution error occurred
- /// - TypeCheckingError if a type checking error occurred
- /// - ResolvedAndTypeChecked if both resolution and type checking succeeded
- /// </summary>
- public static PipelineOutcome ResolveAndTypecheck(Program program, string bplFileName, out LinearTypeChecker linearTypeChecker, out MoverTypeChecker moverTypeChecker)
- {
- Contract.Requires(program != null);
- Contract.Requires(bplFileName != null);
-
- linearTypeChecker = null;
- moverTypeChecker = null;
-
- // ---------- Resolve ------------------------------------------------------------
-
- if (CommandLineOptions.Clo.NoResolve)
- {
- return PipelineOutcome.Done;
- }
-
- int errorCount = program.Resolve();
- if (errorCount != 0)
- {
- Console.WriteLine("{0} name resolution errors detected in {1}", errorCount, GetFileNameForConsole(bplFileName));
- return PipelineOutcome.ResolutionError;
- }
-
- // ---------- Type check ------------------------------------------------------------
-
- if (CommandLineOptions.Clo.NoTypecheck)
- {
- return PipelineOutcome.Done;
- }
-
- errorCount = program.Typecheck();
- if (errorCount != 0)
- {
- Console.WriteLine("{0} type checking errors detected in {1}", errorCount, GetFileNameForConsole(bplFileName));
- return PipelineOutcome.TypeCheckingError;
- }
-
- if (PolymorphismChecker.IsMonomorphic(program))
- {
- CommandLineOptions.Clo.TypeEncodingMethod = CommandLineOptions.TypeEncoding.Monomorphic;
- }
-
- CollectModSets(program);
-
- moverTypeChecker = new MoverTypeChecker(program);
- moverTypeChecker.TypeCheck();
- if (moverTypeChecker.errorCount != 0)
- {
- Console.WriteLine("{0} type checking errors detected in {1}", moverTypeChecker.errorCount, GetFileNameForConsole(bplFileName));
- return PipelineOutcome.TypeCheckingError;
- }
-
- linearTypeChecker = new LinearTypeChecker(program);
- linearTypeChecker.TypeCheck();
- if (linearTypeChecker.errorCount == 0)
- {
- linearTypeChecker.Transform();
- }
- else
- {
- Console.WriteLine("{0} type checking errors detected in {1}", linearTypeChecker.errorCount, GetFileNameForConsole(bplFileName));
- return PipelineOutcome.TypeCheckingError;
- }
-
- if (CommandLineOptions.Clo.PrintFile != null && CommandLineOptions.Clo.PrintDesugarings)
- {
- // if PrintDesugaring option is engaged, print the file here, after resolution and type checking
- PrintBplFile(CommandLineOptions.Clo.PrintFile, program, true, true, CommandLineOptions.Clo.PrettyPrint);
- }
-
- return PipelineOutcome.ResolvedAndTypeChecked;
- }
-
-
- public static void Inline(Program program)
- {
- Contract.Requires(program != null);
-
- if (CommandLineOptions.Clo.Trace)
- Console.WriteLine("Inlining...");
-
- // Inline
- var TopLevelDeclarations = cce.NonNull(program.TopLevelDeclarations);
-
- if (CommandLineOptions.Clo.ProcedureInlining != CommandLineOptions.Inlining.None)
- {
- bool inline = false;
- foreach (var d in TopLevelDeclarations)
- {
- if ((d is Procedure || d is Implementation) && d.FindExprAttribute("inline") != null)
- {
- inline = true;
- }
- }
- if (inline)
- {
- foreach (var impl in TopLevelDeclarations.OfType<Implementation>())
- {
- impl.OriginalBlocks = impl.Blocks;
- impl.OriginalLocVars = impl.LocVars;
- }
- foreach (var impl in TopLevelDeclarations.OfType<Implementation>())
- {
- if (CommandLineOptions.Clo.UserWantsToCheckRoutine(impl.Name) && !impl.SkipVerification)
- {
- Inliner.ProcessImplementation(program, impl);
- }
- }
- foreach (var impl in TopLevelDeclarations.OfType<Implementation>())
- {
- impl.OriginalBlocks = null;
- impl.OriginalLocVars = null;
- }
- }
- }
- }
-
-
- /// <summary>
- /// Given a resolved and type checked Boogie program, infers invariants for the program
- /// and then attempts to verify it. Returns:
- /// - Done if command line specified no verification
- /// - FatalError if a fatal error occurred, in which case an error has been printed to console
- /// - VerificationCompleted if inference and verification completed, in which the out
- /// parameters contain meaningful values
- /// </summary>
- public static PipelineOutcome InferAndVerify(Program program,
- PipelineStatistics stats,
- string programId = null,
- ErrorReporterDelegate er = null, string requestId = null)
- {
- Contract.Requires(program != null);
- Contract.Requires(stats != null);
- Contract.Ensures(0 <= Contract.ValueAtReturn(out stats.InconclusiveCount) && 0 <= Contract.ValueAtReturn(out stats.TimeoutCount));
-
- if (requestId == null)
- {
- requestId = FreshRequestId();
- }
-
- var start = DateTime.UtcNow;
-
- #region Do some pre-abstract-interpretation preprocessing on the program
- // Doing lambda expansion before abstract interpretation means that the abstract interpreter
- // never needs to see any lambda expressions. (On the other hand, if it were useful for it
- // to see lambdas, then it would be better to more lambda expansion until after infererence.)
- if (CommandLineOptions.Clo.ExpandLambdas) {
- LambdaHelper.ExpandLambdas(program);
- //PrintBplFile ("-", program, true);
- }
- #endregion
-
- #region Infer invariants using Abstract Interpretation
-
- // Always use (at least) intervals, if not specified otherwise (e.g. with the "/noinfer" switch)
- if (CommandLineOptions.Clo.UseAbstractInterpretation)
- {
- if (!CommandLineOptions.Clo.Ai.J_Intervals && !CommandLineOptions.Clo.Ai.J_Trivial)
- {
- // use /infer:j as the default
- CommandLineOptions.Clo.Ai.J_Intervals = true;
- }
- }
- Microsoft.Boogie.AbstractInterpretation.NativeAbstractInterpretation.RunAbstractInterpretation(program);
-
- #endregion
-
- #region Do some post-abstract-interpretation preprocessing on the program (e.g., loop unrolling)
-
- if (CommandLineOptions.Clo.LoopUnrollCount != -1)
- {
- program.UnrollLoops(CommandLineOptions.Clo.LoopUnrollCount, CommandLineOptions.Clo.SoundLoopUnrolling);
- }
-
- Dictionary<string, Dictionary<string, Block>> extractLoopMappingInfo = null;
- if (CommandLineOptions.Clo.ExtractLoops)
- {
- extractLoopMappingInfo = program.ExtractLoops();
- }
-
- if (CommandLineOptions.Clo.PrintInstrumented)
- {
- program.Emit(new TokenTextWriter(Console.Out, CommandLineOptions.Clo.PrettyPrint));
- }
- #endregion
-
- if (!CommandLineOptions.Clo.Verify)
- {
- return PipelineOutcome.Done;
- }
-
- #region Run Houdini and verify
- if (CommandLineOptions.Clo.ContractInfer)
- {
- return RunHoudini(program, stats, er);
- }
- #endregion
-
- #region Select and prioritize implementations that should be verified
-
- var impls = program.Implementations.Where(
- impl => impl != null && CommandLineOptions.Clo.UserWantsToCheckRoutine(cce.NonNull(impl.Name)) && !impl.SkipVerification);
-
- // operate on a stable copy, in case it gets updated while we're running
- Implementation[] stablePrioritizedImpls = null;
- if (0 < CommandLineOptions.Clo.VerifySnapshots)
- {
- OtherDefinitionAxiomsCollector.Collect(program.Axioms);
- DependencyCollector.Collect(program);
- stablePrioritizedImpls = impls.OrderByDescending(
- impl => impl.Priority != 1 ? impl.Priority : Cache.VerificationPriority(impl)).ToArray();
- }
- else
- {
- stablePrioritizedImpls = impls.OrderByDescending(impl => impl.Priority).ToArray();
- }
-
- #endregion
-
- if (1 < CommandLineOptions.Clo.VerifySnapshots)
- {
- CachedVerificationResultInjector.Inject(program, stablePrioritizedImpls, requestId, programId, out stats.CachingActionCounts);
- }
-
- #region Verify each implementation
-
- var outputCollector = new OutputCollector(stablePrioritizedImpls);
- var outcome = PipelineOutcome.VerificationCompleted;
-
- try
- {
- var cts = new CancellationTokenSource();
- RequestIdToCancellationTokenSource.AddOrUpdate(requestId, cts, (k, ov) => cts);
-
- var tasks = new Task[stablePrioritizedImpls.Length];
- // We use this semaphore to limit the number of tasks that are currently executing.
- var semaphore = new SemaphoreSlim(CommandLineOptions.Clo.VcsCores);
-
- // Create a task per implementation.
- for (int i = 0; i < stablePrioritizedImpls.Length; i++)
- {
- var taskIndex = i;
- var id = stablePrioritizedImpls[taskIndex].Id;
-
- CancellationTokenSource old;
- if (ImplIdToCancellationTokenSource.TryGetValue(id, out old))
- {
- old.Cancel();
- }
- ImplIdToCancellationTokenSource.AddOrUpdate(id, cts, (k, ov) => cts);
-
- var t = new Task((dummy) =>
- {
- try
- {
- if (outcome == PipelineOutcome.FatalError)
- {
- return;
- }
- if (cts.Token.IsCancellationRequested)
- {
- cts.Token.ThrowIfCancellationRequested();
- }
- VerifyImplementation(program, stats, er, requestId, extractLoopMappingInfo, stablePrioritizedImpls, taskIndex, outputCollector, Checkers, programId);
- ImplIdToCancellationTokenSource.TryRemove(id, out old);
- }
- finally
- {
- semaphore.Release();
- }
- }, cts.Token, TaskCreationOptions.LongRunning);
- tasks[taskIndex] = t;
- }
-
- // Execute the tasks.
- int j = 0;
- for (; j < stablePrioritizedImpls.Length && outcome != PipelineOutcome.FatalError; j++)
- {
- try
- {
- semaphore.Wait(cts.Token);
- }
- catch (OperationCanceledException)
- {
- break;
- }
- tasks[j].Start(TaskScheduler.Default);
- }
-
- // Don't wait for tasks that haven't been started yet.
- tasks = tasks.Take(j).ToArray();
- Task.WaitAll(tasks);
- }
- catch (AggregateException ae)
- {
- ae.Handle(e =>
- {
- var pe = e as ProverException;
- if (pe != null)
- {
- printer.ErrorWriteLine(Console.Out, "Fatal Error: ProverException: {0}", e);
- outcome = PipelineOutcome.FatalError;
- return true;
- }
- var oce = e as OperationCanceledException;
- if (oce != null)
- {
- return true;
- }
- return false;
- });
- }
- finally
- {
- CleanupCheckers(requestId);
- }
-
- cce.NonNull(CommandLineOptions.Clo.TheProverFactory).Close();
-
- outputCollector.WriteMoreOutput();
-
- if (1 < CommandLineOptions.Clo.VerifySnapshots && programId != null)
- {
- program.FreezeTopLevelDeclarations();
- programCache.Set(programId, program, policy);
- }
-
- if (0 <= CommandLineOptions.Clo.VerifySnapshots && CommandLineOptions.Clo.TraceCachingForBenchmarking)
- {
- var end = DateTime.UtcNow;
- if (TimePerRequest.Count == 0)
- {
- FirstRequestStart = start;
- }
- TimePerRequest[requestId] = end.Subtract(start);
- StatisticsPerRequest[requestId] = stats;
-
- var printTimes = true;
-
- Console.Out.WriteLine(CachedVerificationResultInjector.Statistics.Output(printTimes));
-
- Console.Out.WriteLine("Statistics per request as CSV:");
- var actions = string.Join(", ", Enum.GetNames(typeof(VC.ConditionGeneration.CachingAction)));
- Console.Out.WriteLine("Request ID{0}, Error, E (C), Inconclusive, I (C), Out of Memory, OoM (C), Timeout, T (C), Verified, V (C), {1}", printTimes ? ", Time (ms)" : "", actions);
- foreach (var kv in TimePerRequest.OrderBy(kv => ExecutionEngine.AutoRequestId(kv.Key)))
- {
- var s = StatisticsPerRequest[kv.Key];
- var cacs = s.CachingActionCounts;
- var c = cacs != null ? ", " + cacs.Select(ac => string.Format("{0,3}", ac)).Concat(", ") : "";
- var t = printTimes ? string.Format(", {0,8:F0}", kv.Value.TotalMilliseconds) : "";
- Console.Out.WriteLine("{0,-19}{1}, {2,2}, {3,2}, {4,2}, {5,2}, {6,2}, {7,2}, {8,2}, {9,2}, {10,2}, {11,2}{12}", kv.Key, t, s.ErrorCount, s.CachedErrorCount, s.InconclusiveCount, s.CachedInconclusiveCount, s.OutOfMemoryCount, s.CachedOutOfMemoryCount, s.TimeoutCount, s.CachedTimeoutCount, s.VerifiedCount, s.CachedVerifiedCount, c);
- }
-
- if (printTimes)
- {
- Console.Out.WriteLine();
- Console.Out.WriteLine("Total time (ms) since first request: {0:F0}", end.Subtract(FirstRequestStart).TotalMilliseconds);
- }
- }
-
- #endregion
-
- if (SecureVCGen.outfile != null)
- SecureVCGen.outfile.Close();
-
- return outcome;
- }
-
- public static void CancelRequest(string requestId)
- {
- Contract.Requires(requestId != null);
-
- CancellationTokenSource cts;
- if (RequestIdToCancellationTokenSource.TryGetValue(requestId, out cts))
- {
- cts.Cancel();
-
- CleanupCheckers(requestId);
- }
- }
-
-
- private static void CleanupCheckers(string requestId)
- {
- if (requestId != null)
- {
- CancellationTokenSource old;
- RequestIdToCancellationTokenSource.TryRemove(requestId, out old);
- }
- lock (RequestIdToCancellationTokenSource)
- {
- if (RequestIdToCancellationTokenSource.IsEmpty)
- {
- lock (Checkers)
- {
- foreach (Checker checker in Checkers)
- {
- Contract.Assert(checker != null);
- checker.Close();
- }
- }
- }
- }
- }
-
-
- private static void VerifyImplementation(Program program, PipelineStatistics stats, ErrorReporterDelegate er, string requestId, Dictionary<string, Dictionary<string, Block>> extractLoopMappingInfo, Implementation[] stablePrioritizedImpls, int index, OutputCollector outputCollector, List<Checker> checkers, string programId)
- {
- Implementation impl = stablePrioritizedImpls[index];
- VerificationResult verificationResult = null;
- var output = new StringWriter();
-
- printer.Inform("", output); // newline
- printer.Inform(string.Format("Verifying {0} ...", impl.Name), output);
-
- int priority = 0;
- if (0 < CommandLineOptions.Clo.VerifySnapshots)
- {
- verificationResult = Cache.Lookup(impl, out priority);
- }
-
- var wasCached = false;
- if (verificationResult != null && priority == Priority.SKIP)
- {
- if (CommandLineOptions.Clo.XmlSink != null)
- {
- CommandLineOptions.Clo.XmlSink.WriteStartMethod(impl.Name, verificationResult.Start);
- }
-
- printer.Inform(string.Format("Retrieving cached verification result for implementation {0}...", impl.Name), output);
- wasCached = true;
- }
- else
- {
- #region Verify the implementation
-
- verificationResult = new VerificationResult(requestId, impl, programId);
-
- using (var vcgen = CreateVCGen(program, checkers))
- {
- vcgen.CachingActionCounts = stats.CachingActionCounts;
- verificationResult.ProofObligationCountBefore = vcgen.CumulativeAssertionCount;
- verificationResult.Start = DateTime.UtcNow;
-
- if (CommandLineOptions.Clo.XmlSink != null)
- {
- CommandLineOptions.Clo.XmlSink.WriteStartMethod(impl.Name, verificationResult.Start);
- }
- try
- {
- if (CommandLineOptions.Clo.inferLeastForUnsat != null)
- {
- var svcgen = vcgen as VC.StratifiedVCGen;
- Contract.Assert(svcgen != null);
- var ss = new HashSet<string>();
- foreach (var c in program.Constants)
- {
- if (!c.Name.StartsWith(CommandLineOptions.Clo.inferLeastForUnsat)) continue;
- ss.Add(c.Name);
- }
- verificationResult.Outcome = svcgen.FindLeastToVerify(impl, ref ss);
- verificationResult.Errors = new List<Counterexample>();
- output.WriteLine("Result: {0}", string.Join(" ", ss));
- }
- else
- {
- verificationResult.Outcome = vcgen.VerifyImplementation(impl, out verificationResult.Errors, requestId);
- if (CommandLineOptions.Clo.ExtractLoops && verificationResult.Errors != null)
- {
- var vcg = vcgen as VCGen;
- if (vcg != null)
- {
- for (int i = 0; i < verificationResult.Errors.Count; i++)
- {
- verificationResult.Errors[i] = vcg.extractLoopTrace(verificationResult.Errors[i], impl.Name, program, extractLoopMappingInfo);
- }
- }
- }
- }
- }
- catch (VCGenException e)
- {
- var errorInfo = errorInformationFactory.CreateErrorInformation(impl.tok, String.Format("{0} (encountered in implementation {1}).", e.Message, impl.Name), requestId, "Error");
- errorInfo.BoogieErrorCode = "BP5010";
- errorInfo.ImplementationName = impl.Name;
- printer.WriteErrorInformation(errorInfo, output);
- if (er != null)
- {
- lock (er)
- {
- er(errorInfo);
- }
- }
- verificationResult.Errors = null;
- verificationResult.Outcome = VCGen.Outcome.Inconclusive;
- }
- catch (UnexpectedProverOutputException upo)
- {
- printer.AdvisoryWriteLine("Advisory: {0} SKIPPED because of internal error: unexpected prover output: {1}", impl.Name, upo.Message);
- verificationResult.Errors = null;
- verificationResult.Outcome = VCGen.Outcome.Inconclusive;
- }
-
- verificationResult.ProofObligationCountAfter = vcgen.CumulativeAssertionCount;
- verificationResult.End = DateTime.UtcNow;
- }
-
- #endregion
-
- #region Cache the verification result
-
- if (0 < CommandLineOptions.Clo.VerifySnapshots && !string.IsNullOrEmpty(impl.Checksum))
- {
- Cache.Insert(impl, verificationResult);
- }
-
- #endregion
- }
-
- #region Process the verification results and statistics
-
- ProcessOutcome(verificationResult.Outcome, verificationResult.Errors, TimeIndication(verificationResult), stats, output, impl.TimeLimit, er, verificationResult.ImplementationName, verificationResult.ImplementationToken, verificationResult.RequestId, wasCached);
-
- ProcessErrors(verificationResult.Errors, verificationResult.Outcome, output, er, impl);
-
- if (CommandLineOptions.Clo.XmlSink != null)
- {
- CommandLineOptions.Clo.XmlSink.WriteEndMethod(verificationResult.Outcome.ToString().ToLowerInvariant(), verificationResult.End, verificationResult.End - verificationResult.Start);
- }
-
- outputCollector.Add(index, output);
-
- outputCollector.WriteMoreOutput();
-
- if (verificationResult.Outcome == VCGen.Outcome.Errors || CommandLineOptions.Clo.Trace)
- {
- Console.Out.Flush();
- }
-
- #endregion
- }
-
-
- class OutputCollector
- {
- StringWriter[] outputs;
-
- int nextPrintableIndex = 0;
-
- public OutputCollector(Implementation[] implementations)
- {
- outputs = new StringWriter[implementations.Length];
- }
-
- public void WriteMoreOutput()
- {
- lock (outputs)
- {
- for (; nextPrintableIndex < outputs.Length && outputs[nextPrintableIndex] != null; nextPrintableIndex++)
- {
- Console.Write(outputs[nextPrintableIndex].ToString());
- outputs[nextPrintableIndex] = null;
- Console.Out.Flush();
- }
- }
- }
-
- public void Add(int index, StringWriter output)
- {
- Contract.Requires(0 <= index && index < outputs.Length);
- Contract.Requires(output != null);
-
- lock (this)
- {
- outputs[index] = output;
- }
- }
- }
-
-
- private static ConditionGeneration CreateVCGen(Program program, List<Checker> checkers)
- {
- ConditionGeneration vcgen = null;
- if (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed)
- {
- vcgen = new DCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers);
- }
- else if (CommandLineOptions.Clo.FixedPointEngine != null)
- {
- vcgen = new FixedpointVC(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers);
- }
- else if (CommandLineOptions.Clo.StratifiedInlining > 0)
- {
- vcgen = new StratifiedVCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers);
- }
- else if (CommandLineOptions.Clo.SecureVcGen != null)
- {
- vcgen = new SecureVCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers);
- }
- else
- {
- vcgen = new VCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers);
- }
- return vcgen;
- }
-
-
- #region Houdini
-
- private static PipelineOutcome RunHoudini(Program program, PipelineStatistics stats, ErrorReporterDelegate er)
- {
- Contract.Requires(stats != null);
-
- if (CommandLineOptions.Clo.AbstractHoudini != null)
- {
- return RunAbstractHoudini(program, stats, er);
- }
-
- if (CommandLineOptions.Clo.StagedHoudini != null)
- {
- return RunStagedHoudini(program, stats, er);
- }
-
- Houdini.HoudiniSession.HoudiniStatistics houdiniStats = new Houdini.HoudiniSession.HoudiniStatistics();
- Houdini.Houdini houdini = new Houdini.Houdini(program, houdiniStats);
- Houdini.HoudiniOutcome outcome = houdini.PerformHoudiniInference();
- houdini.Close();
-
- if (CommandLineOptions.Clo.PrintAssignment)
- {
- Console.WriteLine("Assignment computed by Houdini:");
- foreach (var x in outcome.assignment)
- {
- Console.WriteLine(x.Key + " = " + x.Value);
- }
- }
-
- if (CommandLineOptions.Clo.Trace)
- {
- int numTrueAssigns = 0;
- foreach (var x in outcome.assignment)
- {
- if (x.Value)
- numTrueAssigns++;
- }
- Console.WriteLine("Number of true assignments = " + numTrueAssigns);
- Console.WriteLine("Number of false assignments = " + (outcome.assignment.Count - numTrueAssigns));
- Console.WriteLine("Prover time = " + houdiniStats.proverTime.ToString("F2"));
- Console.WriteLine("Unsat core prover time = " + houdiniStats.unsatCoreProverTime.ToString("F2"));
- Console.WriteLine("Number of prover queries = " + houdiniStats.numProverQueries);
- Console.WriteLine("Number of unsat core prover queries = " + houdiniStats.numUnsatCoreProverQueries);
- Console.WriteLine("Number of unsat core prunings = " + houdiniStats.numUnsatCorePrunings);
- }
-
- foreach (Houdini.VCGenOutcome x in outcome.implementationOutcomes.Values)
- {
- ProcessOutcome(x.outcome, x.errors, "", stats, Console.Out, CommandLineOptions.Clo.ProverKillTime, er);
- ProcessErrors(x.errors, x.outcome, Console.Out, er);
- }
-
- return PipelineOutcome.Done;
- }
-
- public static Program ProgramFromFile(string filename) {
- Program p = ParseBoogieProgram(new List<string> { filename }, false);
- System.Diagnostics.Debug.Assert(p != null);
- LinearTypeChecker linearTypeChecker;
- MoverTypeChecker moverTypeChecker;
- PipelineOutcome oc = ExecutionEngine.ResolveAndTypecheck(p, filename, out linearTypeChecker, out moverTypeChecker);
- System.Diagnostics.Debug.Assert(oc == PipelineOutcome.ResolvedAndTypeChecked);
- return p;
- }
-
- private static PipelineOutcome RunStagedHoudini(Program program, PipelineStatistics stats, ErrorReporterDelegate er)
- {
- Houdini.HoudiniSession.HoudiniStatistics houdiniStats = new Houdini.HoudiniSession.HoudiniStatistics();
- Houdini.StagedHoudini stagedHoudini = new Houdini.StagedHoudini(program, houdiniStats, ProgramFromFile);
- Houdini.HoudiniOutcome outcome = stagedHoudini.PerformStagedHoudiniInference();
-
- if (CommandLineOptions.Clo.PrintAssignment)
- {
- Console.WriteLine("Assignment computed by Houdini:");
- foreach (var x in outcome.assignment)
- {
- Console.WriteLine(x.Key + " = " + x.Value);
- }
- }
-
- if (CommandLineOptions.Clo.Trace)
- {
- int numTrueAssigns = 0;
- foreach (var x in outcome.assignment)
- {
- if (x.Value)
- numTrueAssigns++;
- }
- Console.WriteLine("Number of true assignments = " + numTrueAssigns);
- Console.WriteLine("Number of false assignments = " + (outcome.assignment.Count - numTrueAssigns));
- Console.WriteLine("Prover time = " + houdiniStats.proverTime.ToString("F2"));
- Console.WriteLine("Unsat core prover time = " + houdiniStats.unsatCoreProverTime.ToString("F2"));
- Console.WriteLine("Number of prover queries = " + houdiniStats.numProverQueries);
- Console.WriteLine("Number of unsat core prover queries = " + houdiniStats.numUnsatCoreProverQueries);
- Console.WriteLine("Number of unsat core prunings = " + houdiniStats.numUnsatCorePrunings);
- }
-
- foreach (Houdini.VCGenOutcome x in outcome.implementationOutcomes.Values)
- {
- ProcessOutcome(x.outcome, x.errors, "", stats, Console.Out, CommandLineOptions.Clo.ProverKillTime, er);
- ProcessErrors(x.errors, x.outcome, Console.Out, er);
- }
-
- return PipelineOutcome.Done;
-
- }
-
-
- private static PipelineOutcome RunAbstractHoudini(Program program, PipelineStatistics stats, ErrorReporterDelegate er)
- {
- Contract.Requires(stats != null);
-
- //CommandLineOptions.Clo.PrintErrorModel = 1;
- CommandLineOptions.Clo.UseProverEvaluate = true;
- CommandLineOptions.Clo.ModelViewFile = "z3model";
- CommandLineOptions.Clo.UseArrayTheory = true;
- CommandLineOptions.Clo.TypeEncodingMethod = CommandLineOptions.TypeEncoding.Monomorphic;
- Houdini.AbstractDomainFactory.Initialize(program);
- var domain = Houdini.AbstractDomainFactory.GetInstance(CommandLineOptions.Clo.AbstractHoudini);
-
- // Run Abstract Houdini
- var abs = new Houdini.AbsHoudini(program, domain);
- var absout = abs.ComputeSummaries();
- ProcessOutcome(absout.outcome, absout.errors, "", stats, Console.Out, CommandLineOptions.Clo.ProverKillTime, er);
- ProcessErrors(absout.errors, absout.outcome, Console.Out, er);
-
- //Houdini.PredicateAbs.Initialize(program);
- //var abs = new Houdini.AbstractHoudini(program);
- //abs.computeSummaries(new Houdini.PredicateAbs(program.TopLevelDeclarations.OfType<Implementation>().First().Name));
-
- return PipelineOutcome.Done;
- }
-
- #endregion
-
-
- private static string TimeIndication(VerificationResult verificationResult)
- {
- var result = "";
- if (CommandLineOptions.Clo.Trace)
- {
- result = string.Format(" [{0:F3} s, {1} proof obligation{2}] ", (verificationResult.End - verificationResult.Start).TotalSeconds, verificationResult.ProofObligationCount, verificationResult.ProofObligationCount == 1 ? "" : "s");
- }
- else if (CommandLineOptions.Clo.TraceProofObligations)
- {
- result = string.Format(" [{0} proof obligation{1}] ", verificationResult.ProofObligationCount, verificationResult.ProofObligationCount == 1 ? "" : "s");
- }
- return result;
- }
-
-
- private static void ProcessOutcome(VC.VCGen.Outcome outcome, List<Counterexample> errors, string timeIndication,
- PipelineStatistics stats, TextWriter tw, int timeLimit, ErrorReporterDelegate er = null, string implName = null, IToken implTok = null, string requestId = null, bool wasCached = false)
- {
- Contract.Requires(stats != null);
-
- UpdateStatistics(stats, outcome, errors, wasCached);
-
- printer.Inform(timeIndication + OutcomeIndication(outcome, errors), tw);
-
- ReportOutcome(outcome, er, implName, implTok, requestId, tw, timeLimit);
- }
-
-
- private static void ReportOutcome(VC.VCGen.Outcome outcome, ErrorReporterDelegate er, string implName, IToken implTok, string requestId, TextWriter tw, int timeLimit)
- {
- ErrorInformation errorInfo = null;
-
- switch (outcome)
- {
- case VCGen.Outcome.ReachedBound:
- tw.WriteLine(string.Format("Stratified Inlining: Reached recursion bound of {0}", CommandLineOptions.Clo.RecursionBound));
- break;
- case VCGen.Outcome.TimedOut:
- if (implName != null && implTok != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(implTok, string.Format("Verification timed out after {0} seconds ({1})", timeLimit, implName), requestId);
- }
- break;
- case VCGen.Outcome.OutOfMemory:
- if (implName != null && implTok != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(implTok, "Verification out of memory (" + implName + ")", requestId);
- }
- break;
- case VCGen.Outcome.Inconclusive:
- if (implName != null && implTok != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(implTok, "Verification inconclusive (" + implName + ")", requestId);
- }
- break;
- }
-
- if (errorInfo != null)
- {
- errorInfo.ImplementationName = implName;
- if (er != null)
- {
- lock (er)
- {
- er(errorInfo);
- }
- }
- }
- }
-
-
- private static string OutcomeIndication(VC.VCGen.Outcome outcome, List<Counterexample> errors)
- {
- string traceOutput = "";
- switch (outcome)
- {
- default:
- Contract.Assert(false); // unexpected outcome
- throw new cce.UnreachableException();
- case VCGen.Outcome.ReachedBound:
- traceOutput = "verified";
- break;
- case VCGen.Outcome.Correct:
- traceOutput = (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed ? "credible" : "verified");
- break;
- case VCGen.Outcome.TimedOut:
- traceOutput = "timed out";
- break;
- case VCGen.Outcome.OutOfMemory:
- traceOutput = "out of memory";
- break;
- case VCGen.Outcome.Inconclusive:
- traceOutput = "inconclusive";
- break;
- case VCGen.Outcome.Errors:
- Contract.Assert(errors != null);
- traceOutput = (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed ? "doomed" : string.Format("error{0}", errors.Count == 1 ? "" : "s"));
- break;
- }
- return traceOutput;
- }
-
-
- private static void UpdateStatistics(PipelineStatistics stats, VC.VCGen.Outcome outcome, List<Counterexample> errors, bool wasCached)
- {
- Contract.Requires(stats != null);
-
- switch (outcome)
- {
- default:
- Contract.Assert(false); // unexpected outcome
- throw new cce.UnreachableException();
- case VCGen.Outcome.ReachedBound:
- Interlocked.Increment(ref stats.VerifiedCount);
- if (wasCached) { Interlocked.Increment(ref stats.CachedVerifiedCount); }
- break;
- case VCGen.Outcome.Correct:
- Interlocked.Increment(ref stats.VerifiedCount);
- if (wasCached) { Interlocked.Increment(ref stats.CachedVerifiedCount); }
- break;
- case VCGen.Outcome.TimedOut:
- Interlocked.Increment(ref stats.TimeoutCount);
- if (wasCached) { Interlocked.Increment(ref stats.CachedTimeoutCount); }
- break;
- case VCGen.Outcome.OutOfMemory:
- Interlocked.Increment(ref stats.OutOfMemoryCount);
- if (wasCached) { Interlocked.Increment(ref stats.CachedOutOfMemoryCount); }
- break;
- case VCGen.Outcome.Inconclusive:
- Interlocked.Increment(ref stats.InconclusiveCount);
- if (wasCached) { Interlocked.Increment(ref stats.CachedInconclusiveCount); }
- break;
- case VCGen.Outcome.Errors:
- if (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed)
- {
- Interlocked.Increment(ref stats.ErrorCount);
- if (wasCached) { Interlocked.Increment(ref stats.CachedErrorCount); }
- }
- else
- {
- Interlocked.Add(ref stats.ErrorCount, errors.Count);
- if (wasCached) { Interlocked.Add(ref stats.CachedErrorCount, errors.Count); }
- }
- break;
- }
- }
-
-
- private static void ProcessErrors(List<Counterexample> errors, VC.VCGen.Outcome outcome, TextWriter tw, ErrorReporterDelegate er, Implementation impl = null)
- {
- var implName = impl != null ? impl.Name : null;
-
- if (errors != null)
- {
- errors.Sort(new CounterexampleComparer());
- foreach (Counterexample error in errors)
- {
- var errorInfo = CreateErrorInformation(error, outcome);
- errorInfo.ImplementationName = implName;
-
- if (CommandLineOptions.Clo.XmlSink != null)
- {
- WriteErrorInformationToXmlSink(errorInfo, error.Trace);
- }
-
- if (CommandLineOptions.Clo.EnhancedErrorMessages == 1)
- {
- foreach (string info in error.relatedInformation)
- {
- Contract.Assert(info != null);
- errorInfo.Out.WriteLine(" " + info);
- }
- }
- if (CommandLineOptions.Clo.ErrorTrace > 0)
- {
- errorInfo.Out.WriteLine("Execution trace:");
- error.Print(4, errorInfo.Out, b => { errorInfo.AddAuxInfo(b.tok, b.Label, "Execution trace"); });
- }
- if (CommandLineOptions.Clo.ModelViewFile != null)
- {
- error.PrintModel(errorInfo.Model);
- }
-
- printer.WriteErrorInformation(errorInfo, tw);
-
- if (er != null)
- {
- lock (er)
- {
- er(errorInfo);
- }
- }
- }
- }
- }
-
-
- private static ErrorInformation CreateErrorInformation(Counterexample error, VC.VCGen.Outcome outcome)
- {
- // BP1xxx: Parsing errors
- // BP2xxx: Name resolution errors
- // BP3xxx: Typechecking errors
- // BP4xxx: Abstract interpretation errors (Is there such a thing?)
- // BP5xxx: Verification errors
-
- ErrorInformation errorInfo;
- var cause = "Error";
- if (outcome == VCGen.Outcome.TimedOut)
- {
- cause = "Timed out on";
- }
- else if (outcome == VCGen.Outcome.OutOfMemory)
- {
- cause = "Out of memory on";
- }
-
- var callError = error as CallCounterexample;
- var returnError = error as ReturnCounterexample;
- var assertError = error as AssertCounterexample;
- if (callError != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(callError.FailingCall.tok, callError.FailingCall.ErrorData as string ?? "A precondition for this call might not hold.", callError.RequestId, callError.OriginalRequestId, cause);
- errorInfo.BoogieErrorCode = "BP5002";
- errorInfo.Kind = ErrorKind.Precondition;
- errorInfo.AddAuxInfo(callError.FailingRequires.tok, callError.FailingRequires.ErrorData as string ?? "This is the precondition that might not hold.", "Related location");
-
- if (!CommandLineOptions.Clo.ForceBplErrors && callError.FailingRequires.ErrorMessage != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(null, callError.FailingRequires.ErrorMessage, callError.RequestId, callError.OriginalRequestId, cause);
- }
- }
- else if (returnError != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(returnError.FailingReturn.tok, "A postcondition might not hold on this return path.", returnError.RequestId, returnError.OriginalRequestId, cause);
- errorInfo.BoogieErrorCode = "BP5003";
- errorInfo.Kind = ErrorKind.Postcondition;
- errorInfo.AddAuxInfo(returnError.FailingEnsures.tok, returnError.FailingEnsures.ErrorData as string ?? "This is the postcondition that might not hold.", "Related location");
-
- if (!CommandLineOptions.Clo.ForceBplErrors && returnError.FailingEnsures.ErrorMessage != null)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(null, returnError.FailingEnsures.ErrorMessage, returnError.RequestId, returnError.OriginalRequestId, cause);
- }
- }
- else // error is AssertCounterexample
- {
- if (assertError.FailingAssert is LoopInitAssertCmd)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(assertError.FailingAssert.tok, "This loop invariant might not hold on entry.", assertError.RequestId, assertError.OriginalRequestId, cause);
- errorInfo.BoogieErrorCode = "BP5004";
- errorInfo.Kind = ErrorKind.InvariantEntry;
- }
- else if (assertError.FailingAssert is LoopInvMaintainedAssertCmd)
- {
- errorInfo = errorInformationFactory.CreateErrorInformation(assertError.FailingAssert.tok, "This loop invariant might not be maintained by the loop.", assertError.RequestId, assertError.OriginalRequestId, cause);
- errorInfo.BoogieErrorCode = "BP5005";
- errorInfo.Kind = ErrorKind.InvariantMaintainance;
- }
- else
- {
- var msg = assertError.FailingAssert.ErrorData as string;
- var tok = assertError.FailingAssert.tok;
- if (!CommandLineOptions.Clo.ForceBplErrors && assertError.FailingAssert.ErrorMessage != null)
- {
- msg = assertError.FailingAssert.ErrorMessage;
- tok = null;
- if (cause == "Error")
- {
- cause = null;
- }
- }
- string bec = null;
- if (msg == null)
- {
- msg = "This assertion might not hold.";
- bec = "BP5001";
- }
-
- errorInfo = errorInformationFactory.CreateErrorInformation(tok, msg, assertError.RequestId, assertError.OriginalRequestId, cause);
- errorInfo.BoogieErrorCode = bec;
- errorInfo.Kind = ErrorKind.Assertion;
- }
- }
-
- return errorInfo;
- }
-
-
- private static void WriteErrorInformationToXmlSink(ErrorInformation errorInfo, List<Block> trace)
- {
- var msg = "assertion violation";
- switch (errorInfo.Kind)
- {
- case ErrorKind.Precondition:
- msg = "precondition violation";
- break;
-
- case ErrorKind.Postcondition:
- msg = "postcondition violation";
- break;
-
- case ErrorKind.InvariantEntry:
- msg = "loop invariant entry violation";
- break;
-
- case ErrorKind.InvariantMaintainance:
- msg = "loop invariant maintenance violation";
- break;
- }
-
- var relatedError = errorInfo.Aux.FirstOrDefault();
- CommandLineOptions.Clo.XmlSink.WriteError(msg, errorInfo.Tok, relatedError.Tok, trace);
- }
-
- }
-
-}
+using System; +using System.Collections.Concurrent; +using System.Collections.Generic; +using System.Diagnostics.Contracts; +using System.IO; +using System.Linq; +using System.Text.RegularExpressions; +using System.Threading; +using System.Threading.Tasks; +using VC; +using BoogiePL = Microsoft.Boogie; +using System.Diagnostics; +using System.Runtime.Caching; + +namespace Microsoft.Boogie +{ + + #region Output printing + + public interface OutputPrinter + { + void ErrorWriteLine(TextWriter tw, string s); + void ErrorWriteLine(TextWriter tw, string format, params object[] args); + void AdvisoryWriteLine(string format, params object[] args); + void Inform(string s, TextWriter tw); + void WriteTrailer(PipelineStatistics stats); + void WriteErrorInformation(ErrorInformation errorInfo, TextWriter tw, bool skipExecutionTrace = true); + void ReportBplError(IToken tok, string message, bool error, TextWriter tw, string category = null); + } + + + public class ConsolePrinter : OutputPrinter + { + public void ErrorWriteLine(TextWriter tw, string s) + { + Contract.Requires(s != null); + if (!s.Contains("Error: ") && !s.Contains("Error BP")) + { + tw.WriteLine(s); + return; + } + + // split the string up into its first line and the remaining lines + string remaining = null; + int i = s.IndexOf('\r'); + if (0 <= i) + { + remaining = s.Substring(i + 1); + if (remaining.StartsWith("\n")) + { + remaining = remaining.Substring(1); + } + s = s.Substring(0, i); + } + + ConsoleColor col = Console.ForegroundColor; + Console.ForegroundColor = ConsoleColor.Red; + tw.WriteLine(s); + Console.ForegroundColor = col; + + if (remaining != null) + { + tw.WriteLine(remaining); + } + } + + + public void ErrorWriteLine(TextWriter tw, string format, params object[] args) + { + Contract.Requires(format != null); + string s = string.Format(format, args); + ErrorWriteLine(tw, s); + } + + + public void AdvisoryWriteLine(string format, params object[] args) + { + Contract.Requires(format != null); + ConsoleColor col = Console.ForegroundColor; + Console.ForegroundColor = ConsoleColor.Yellow; + Console.WriteLine(format, args); + Console.ForegroundColor = col; + } + + + /// <summary> + /// Inform the user about something and proceed with translation normally. + /// Print newline after the message. + /// </summary> + public void Inform(string s, TextWriter tw) + { + if (CommandLineOptions.Clo.Trace || CommandLineOptions.Clo.TraceProofObligations) + { + tw.WriteLine(s); + } + } + + + public void WriteTrailer(PipelineStatistics stats) + { + Contract.Requires(stats != null); + Contract.Requires(0 <= stats.VerifiedCount && 0 <= stats.ErrorCount && 0 <= stats.InconclusiveCount && 0 <= stats.TimeoutCount && 0 <= stats.OutOfMemoryCount); + + Console.WriteLine(); + if (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed) + { + Console.Write("{0} finished with {1} credible, {2} doomed{3}", CommandLineOptions.Clo.DescriptiveToolName, stats.VerifiedCount, stats.ErrorCount, stats.ErrorCount == 1 ? "" : "s"); + } + else + { + Console.Write("{0} finished with {1} verified, {2} error{3}", CommandLineOptions.Clo.DescriptiveToolName, stats.VerifiedCount, stats.ErrorCount, stats.ErrorCount == 1 ? "" : "s"); + } + if (stats.InconclusiveCount != 0) + { + Console.Write(", {0} inconclusive{1}", stats.InconclusiveCount, stats.InconclusiveCount == 1 ? "" : "s"); + } + if (stats.TimeoutCount != 0) + { + Console.Write(", {0} time out{1}", stats.TimeoutCount, stats.TimeoutCount == 1 ? "" : "s"); + } + if (stats.OutOfMemoryCount != 0) + { + Console.Write(", {0} out of memory", stats.OutOfMemoryCount); + } + Console.WriteLine(); + Console.Out.Flush(); + } + + + public void WriteErrorInformation(ErrorInformation errorInfo, TextWriter tw, bool skipExecutionTrace = true) + { + Contract.Requires(errorInfo != null); + + ReportBplError(errorInfo.Tok, errorInfo.FullMsg, true, tw); + + foreach (var e in errorInfo.Aux) + { + if (!(skipExecutionTrace && e.Category != null && e.Category.Contains("Execution trace"))) + { + ReportBplError(e.Tok, e.FullMsg, false, tw); + } + } + + tw.Write(errorInfo.Out.ToString()); + tw.Write(errorInfo.Model.ToString()); + tw.Flush(); + } + + + public virtual void ReportBplError(IToken tok, string message, bool error, TextWriter tw, string category = null) + { + Contract.Requires(message != null); + + if (category != null) { + message = string.Format("{0}: {1}", category, message); + } + string s; + if (tok != null) { + s = string.Format("{0}({1},{2}): {3}", ExecutionEngine.GetFileNameForConsole(tok.filename), tok.line, tok.col, message); + } else { + s = message; + } + if (error) { + ErrorWriteLine(tw, s); + } else { + tw.WriteLine(s); + } + } + } + + #endregion + + + public enum PipelineOutcome + { + Done, + ResolutionError, + TypeCheckingError, + ResolvedAndTypeChecked, + FatalError, + VerificationCompleted + } + + + public class PipelineStatistics + { + public int ErrorCount; + public int VerifiedCount; + public int InconclusiveCount; + public int TimeoutCount; + public int OutOfMemoryCount; + public long[] CachingActionCounts; + public int CachedErrorCount; + public int CachedVerifiedCount; + public int CachedInconclusiveCount; + public int CachedTimeoutCount; + public int CachedOutOfMemoryCount; + } + + + #region Error reporting + + public delegate void ErrorReporterDelegate(ErrorInformation errInfo); + + + public enum ErrorKind + { + Assertion, + Precondition, + Postcondition, + InvariantEntry, + InvariantMaintainance + } + + + public class ErrorInformationFactory + { + public virtual ErrorInformation CreateErrorInformation(IToken tok, string msg, string requestId = null, string originalRequestId = null, string category = null) + { + Contract.Requires(1 <= tok.line && 1 <= tok.col); + Contract.Requires(msg != null); + + return ErrorInformation.CreateErrorInformation(tok, msg, requestId, originalRequestId, category); + } + } + + + public class ErrorInformation + { + public readonly IToken Tok; + public string Msg; + public string Category { get; set; } + public string BoogieErrorCode { get; set; } + public readonly List<AuxErrorInfo> Aux = new List<AuxErrorInfo>(); + public string OriginalRequestId { get; set; } + public string RequestId { get; set; } + public ErrorKind Kind { get; set; } + public string ImplementationName { get; set; } + public TextWriter Out = new StringWriter(); + public TextWriter Model = new StringWriter(); + + public string FullMsg + { + get + { + var prefix = Category; + if (BoogieErrorCode != null) + { + prefix = prefix == null ? BoogieErrorCode : prefix + " " + BoogieErrorCode; + } + return prefix != null ? string.Format("{0}: {1}", prefix, Msg) : Msg; + } + } + + public struct AuxErrorInfo + { + public readonly IToken Tok; + public readonly string Msg; + public readonly string Category; + + public string FullMsg + { + get + { + return Category != null ? string.Format("{0}: {1}", Category, Msg) : Msg; + } + } + + public AuxErrorInfo(IToken tok, string msg, string category = null) + { + Tok = tok; + Msg = CleanUp(msg); + Category = category; + } + } + + protected ErrorInformation(IToken tok, string msg) + { + Contract.Requires(tok != null); + Contract.Requires(1 <= tok.line && 1 <= tok.col); + Contract.Requires(msg != null); + + Tok = tok; + Msg = CleanUp(msg); + } + + internal static ErrorInformation CreateErrorInformation(IToken tok, string msg, string requestId = null, string originalRequestId = null, string category = null) + { + var result = new ErrorInformation(tok, msg); + result.RequestId = requestId; + result.OriginalRequestId = originalRequestId; + result.Category = category; + return result; + } + + public virtual void AddAuxInfo(IToken tok, string msg, string category = null) + { + Contract.Requires(tok != null); + Contract.Requires(1 <= tok.line && 1 <= tok.col); + Contract.Requires(msg != null); + Aux.Add(new AuxErrorInfo(tok, msg, category)); + } + + protected static string CleanUp(string msg) + { + if (msg.ToLower().StartsWith("error: ")) + { + return msg.Substring(7); + } + else + { + return msg; + } + } + } + + #endregion + + + public sealed class VerificationResult + { + public readonly string RequestId; + public readonly string Checksum; + public readonly string DependeciesChecksum; + public readonly string ImplementationName; + public readonly IToken ImplementationToken; + public readonly string ProgramId; + + public DateTime Start { get; set; } + public DateTime End { get; set; } + + public int ProofObligationCount { get { return ProofObligationCountAfter - ProofObligationCountBefore; } } + public int ProofObligationCountBefore { get; set; } + public int ProofObligationCountAfter { get; set; } + + public ConditionGeneration.Outcome Outcome { get; set; } + public List<Counterexample> Errors; + + public ISet<byte[]> AssertionChecksums { get; private set; } + + public VerificationResult(string requestId, Implementation implementation, string programId = null) + { + Checksum = implementation.Checksum; + DependeciesChecksum = implementation.DependencyChecksum; + RequestId = requestId; + ImplementationName = implementation.Name; + ImplementationToken = implementation.tok; + ProgramId = programId; + AssertionChecksums = implementation.AssertionChecksums; + } + } + + + public class PolymorphismChecker : ReadOnlyVisitor + { + bool isMonomorphic = true; + + public override DeclWithFormals VisitDeclWithFormals(DeclWithFormals node) + { + if (node.TypeParameters.Count > 0) + isMonomorphic = false; + return base.VisitDeclWithFormals(node); + } + + public override BinderExpr VisitBinderExpr(BinderExpr node) + { + if (node.TypeParameters.Count > 0) + isMonomorphic = false; + return base.VisitBinderExpr(node); + } + + public override MapType VisitMapType(MapType node) + { + if (node.TypeParameters.Count > 0) + isMonomorphic = false; + return base.VisitMapType(node); + } + + public override Expr VisitNAryExpr(NAryExpr node) + { + BinaryOperator op = node.Fun as BinaryOperator; + if (op != null && op.Op == BinaryOperator.Opcode.Subtype) + isMonomorphic = false; + return base.VisitNAryExpr(node); + } + + public static bool IsMonomorphic(Program program) + { + var checker = new PolymorphismChecker(); + checker.VisitProgram(program); + return checker.isMonomorphic; + } + } + + public class ExecutionEngine + { + public static OutputPrinter printer; + + public static ErrorInformationFactory errorInformationFactory = new ErrorInformationFactory(); + + static int autoRequestIdCount; + + static readonly string AutoRequestIdPrefix = "auto_request_id_"; + + public static string FreshRequestId() + { + var id = Interlocked.Increment(ref autoRequestIdCount); + return AutoRequestIdPrefix + id; + } + + public static int AutoRequestId(string id) + { + if (id.StartsWith(AutoRequestIdPrefix)) + { + int result; + if (int.TryParse(id.Substring(AutoRequestIdPrefix.Length), out result)) + { + return result; + } + } + return -1; + } + + public readonly static VerificationResultCache Cache = new VerificationResultCache(); + + static readonly MemoryCache programCache = new MemoryCache("ProgramCache"); + static readonly CacheItemPolicy policy = new CacheItemPolicy { SlidingExpiration = new TimeSpan(0, 10, 0), Priority = CacheItemPriority.Default }; + + public static Program CachedProgram(string programId) + { + var result = programCache.Get(programId) as Program; + return result; + } + + static List<Checker> Checkers = new List<Checker>(); + + static DateTime FirstRequestStart; + + static readonly ConcurrentDictionary<string, TimeSpan> TimePerRequest = new ConcurrentDictionary<string, TimeSpan>(); + static readonly ConcurrentDictionary<string, PipelineStatistics> StatisticsPerRequest = new ConcurrentDictionary<string, PipelineStatistics>(); + + static readonly ConcurrentDictionary<string, CancellationTokenSource> ImplIdToCancellationTokenSource = new ConcurrentDictionary<string, CancellationTokenSource>(); + + static readonly ConcurrentDictionary<string, CancellationTokenSource> RequestIdToCancellationTokenSource = new ConcurrentDictionary<string, CancellationTokenSource>(); + + public static void ProcessFiles(List<string> fileNames, bool lookForSnapshots = true, string programId = null) + { + Contract.Requires(cce.NonNullElements(fileNames)); + + if (programId == null) + { + programId = "main_program_id"; + } + + if (CommandLineOptions.Clo.VerifySeparately && 1 < fileNames.Count) + { + foreach (var f in fileNames) + { + ProcessFiles(new List<string> { f }, lookForSnapshots, f); + } + return; + } + + if (0 <= CommandLineOptions.Clo.VerifySnapshots && lookForSnapshots) + { + var snapshotsByVersion = LookForSnapshots(fileNames); + foreach (var s in snapshotsByVersion) + { + ProcessFiles(new List<string>(s), false, programId); + } + return; + } + + using (XmlFileScope xf = new XmlFileScope(CommandLineOptions.Clo.XmlSink, fileNames[fileNames.Count - 1])) + { + Program program = ParseBoogieProgram(fileNames, false); + if (program == null) + return; + if (CommandLineOptions.Clo.PrintFile != null) + { + PrintBplFile(CommandLineOptions.Clo.PrintFile, program, false, true, CommandLineOptions.Clo.PrettyPrint); + } + + LinearTypeChecker linearTypeChecker; + CivlTypeChecker civlTypeChecker; + PipelineOutcome oc = ResolveAndTypecheck(program, fileNames[fileNames.Count - 1], out linearTypeChecker, out civlTypeChecker); + if (oc != PipelineOutcome.ResolvedAndTypeChecked) + return; + + if (CommandLineOptions.Clo.PrintCFGPrefix != null) + { + foreach (var impl in program.Implementations) + { + using (StreamWriter sw = new StreamWriter(CommandLineOptions.Clo.PrintCFGPrefix + "." + impl.Name + ".dot")) + { + sw.Write(program.ProcessLoops(impl).ToDot()); + } + } + } + + if (CommandLineOptions.Clo.StratifiedInlining == 0) + { + Concurrency.Transform(linearTypeChecker, civlTypeChecker); + (new LinearEraser()).VisitProgram(program); + if (CommandLineOptions.Clo.CivlDesugaredFile != null) + { + int oldPrintUnstructured = CommandLineOptions.Clo.PrintUnstructured; + CommandLineOptions.Clo.PrintUnstructured = 1; + PrintBplFile(CommandLineOptions.Clo.CivlDesugaredFile, program, false, false, CommandLineOptions.Clo.PrettyPrint); + CommandLineOptions.Clo.PrintUnstructured = oldPrintUnstructured; + } + } + + EliminateDeadVariables(program); + + CoalesceBlocks(program); + + Inline(program); + + var stats = new PipelineStatistics(); + oc = InferAndVerify(program, stats, 1 < CommandLineOptions.Clo.VerifySnapshots ? programId : null); + switch (oc) + { + case PipelineOutcome.Done: + case PipelineOutcome.VerificationCompleted: + printer.WriteTrailer(stats); + break; + default: + break; + } + } + } + + public static IList<IList<string>> LookForSnapshots(IList<string> fileNames) + { + Contract.Requires(fileNames != null); + + var result = new List<IList<string>>(); + for (int version = 0; true; version++) + { + var nextSnapshot = new List<string>(); + foreach (var name in fileNames) + { + var versionedName = name.Replace(Path.GetExtension(name), ".v" + version + Path.GetExtension(name)); + if (File.Exists(versionedName)) + { + nextSnapshot.Add(versionedName); + } + } + if (nextSnapshot.Any()) + { + result.Add(nextSnapshot); + } + else + { + break; + } + } + return result; + } + + + public static void CoalesceBlocks(Program program) + { + if (CommandLineOptions.Clo.CoalesceBlocks) + { + if (CommandLineOptions.Clo.Trace) + Console.WriteLine("Coalescing blocks..."); + Microsoft.Boogie.BlockCoalescer.CoalesceBlocks(program); + } + } + + + public static void CollectModSets(Program program) + { + if (CommandLineOptions.Clo.DoModSetAnalysis) + { + new ModSetCollector().DoModSetAnalysis(program); + } + } + + + public static void EliminateDeadVariables(Program program) + { + Microsoft.Boogie.UnusedVarEliminator.Eliminate(program); + } + + + public static void PrintBplFile(string filename, Program program, bool allowPrintDesugaring, bool setTokens = true, bool pretty = false) + { + Contract.Requires(program != null); + Contract.Requires(filename != null); + bool oldPrintDesugaring = CommandLineOptions.Clo.PrintDesugarings; + if (!allowPrintDesugaring) + { + CommandLineOptions.Clo.PrintDesugarings = false; + } + using (TokenTextWriter writer = filename == "-" ? + new TokenTextWriter("<console>", Console.Out, setTokens, pretty) : + new TokenTextWriter(filename, setTokens, pretty)) + { + if (CommandLineOptions.Clo.ShowEnv != CommandLineOptions.ShowEnvironment.Never) + { + writer.WriteLine("// " + CommandLineOptions.Clo.Version); + writer.WriteLine("// " + CommandLineOptions.Clo.Environment); + } + writer.WriteLine(); + program.Emit(writer); + } + CommandLineOptions.Clo.PrintDesugarings = oldPrintDesugaring; + } + + + /// <summary> + /// Parse the given files into one Boogie program. If an I/O or parse error occurs, an error will be printed + /// and null will be returned. On success, a non-null program is returned. + /// </summary> + public static Program ParseBoogieProgram(List<string> fileNames, bool suppressTraceOutput) + { + Contract.Requires(cce.NonNullElements(fileNames)); + + Program program = null; + bool okay = true; + for (int fileId = 0; fileId < fileNames.Count; fileId++) + { + string bplFileName = fileNames[fileId]; + if (!suppressTraceOutput) + { + if (CommandLineOptions.Clo.XmlSink != null) + { + CommandLineOptions.Clo.XmlSink.WriteFileFragment(bplFileName); + } + if (CommandLineOptions.Clo.Trace) + { + Console.WriteLine("Parsing " + GetFileNameForConsole(bplFileName)); + } + } + + Program programSnippet; + int errorCount; + try + { + var defines = new List<string>() { "FILE_" + fileId }; + errorCount = Parser.Parse(bplFileName, defines, out programSnippet, CommandLineOptions.Clo.UseBaseNameForFileName); + if (programSnippet == null || errorCount != 0) + { + Console.WriteLine("{0} parse errors detected in {1}", errorCount, GetFileNameForConsole(bplFileName)); + okay = false; + continue; + } + } + catch (IOException e) + { + printer.ErrorWriteLine(Console.Out, "Error opening file \"{0}\": {1}", GetFileNameForConsole(bplFileName), e.Message); + okay = false; + continue; + } + if (program == null) + { + program = programSnippet; + } + else if (programSnippet != null) + { + program.AddTopLevelDeclarations(programSnippet.TopLevelDeclarations); + } + } + if (!okay) + { + return null; + } + else if (program == null) + { + return new Program(); + } + else + { + return program; + } + } + + internal static string GetFileNameForConsole(string filename) + { + return (CommandLineOptions.Clo.UseBaseNameForFileName && !string.IsNullOrEmpty(filename) && filename != "<console>") ? System.IO.Path.GetFileName(filename) : filename; + } + + + /// <summary> + /// Resolves and type checks the given Boogie program. Any errors are reported to the + /// console. Returns: + /// - Done if no errors occurred, and command line specified no resolution or no type checking. + /// - ResolutionError if a resolution error occurred + /// - TypeCheckingError if a type checking error occurred + /// - ResolvedAndTypeChecked if both resolution and type checking succeeded + /// </summary> + public static PipelineOutcome ResolveAndTypecheck(Program program, string bplFileName, out LinearTypeChecker linearTypeChecker, out CivlTypeChecker civlTypeChecker) + { + Contract.Requires(program != null); + Contract.Requires(bplFileName != null); + + linearTypeChecker = null; + civlTypeChecker = null; + + // ---------- Resolve ------------------------------------------------------------ + + if (CommandLineOptions.Clo.NoResolve) + { + return PipelineOutcome.Done; + } + + int errorCount = program.Resolve(); + if (errorCount != 0) + { + Console.WriteLine("{0} name resolution errors detected in {1}", errorCount, GetFileNameForConsole(bplFileName)); + return PipelineOutcome.ResolutionError; + } + + // ---------- Type check ------------------------------------------------------------ + + if (CommandLineOptions.Clo.NoTypecheck) + { + return PipelineOutcome.Done; + } + + errorCount = program.Typecheck(); + if (errorCount != 0) + { + Console.WriteLine("{0} type checking errors detected in {1}", errorCount, GetFileNameForConsole(bplFileName)); + return PipelineOutcome.TypeCheckingError; + } + + if (PolymorphismChecker.IsMonomorphic(program)) + { + CommandLineOptions.Clo.TypeEncodingMethod = CommandLineOptions.TypeEncoding.Monomorphic; + } + + CollectModSets(program); + + civlTypeChecker = new CivlTypeChecker(program); + civlTypeChecker.TypeCheck(); + if (civlTypeChecker.errorCount != 0) + { + Console.WriteLine("{0} type checking errors detected in {1}", civlTypeChecker.errorCount, GetFileNameForConsole(bplFileName)); + return PipelineOutcome.TypeCheckingError; + } + + linearTypeChecker = new LinearTypeChecker(program); + linearTypeChecker.TypeCheck(); + if (linearTypeChecker.errorCount == 0) + { + linearTypeChecker.Transform(); + } + else + { + Console.WriteLine("{0} type checking errors detected in {1}", linearTypeChecker.errorCount, GetFileNameForConsole(bplFileName)); + return PipelineOutcome.TypeCheckingError; + } + + if (CommandLineOptions.Clo.PrintFile != null && CommandLineOptions.Clo.PrintDesugarings) + { + // if PrintDesugaring option is engaged, print the file here, after resolution and type checking + PrintBplFile(CommandLineOptions.Clo.PrintFile, program, true, true, CommandLineOptions.Clo.PrettyPrint); + } + + return PipelineOutcome.ResolvedAndTypeChecked; + } + + + public static void Inline(Program program) + { + Contract.Requires(program != null); + + if (CommandLineOptions.Clo.Trace) + Console.WriteLine("Inlining..."); + + // Inline + var TopLevelDeclarations = cce.NonNull(program.TopLevelDeclarations); + + if (CommandLineOptions.Clo.ProcedureInlining != CommandLineOptions.Inlining.None) + { + bool inline = false; + foreach (var d in TopLevelDeclarations) + { + if ((d is Procedure || d is Implementation) && d.FindExprAttribute("inline") != null) + { + inline = true; + } + } + if (inline) + { + foreach (var impl in TopLevelDeclarations.OfType<Implementation>()) + { + impl.OriginalBlocks = impl.Blocks; + impl.OriginalLocVars = impl.LocVars; + } + foreach (var impl in TopLevelDeclarations.OfType<Implementation>()) + { + if (CommandLineOptions.Clo.UserWantsToCheckRoutine(impl.Name) && !impl.SkipVerification) + { + Inliner.ProcessImplementation(program, impl); + } + } + foreach (var impl in TopLevelDeclarations.OfType<Implementation>()) + { + impl.OriginalBlocks = null; + impl.OriginalLocVars = null; + } + } + } + } + + + /// <summary> + /// Given a resolved and type checked Boogie program, infers invariants for the program + /// and then attempts to verify it. Returns: + /// - Done if command line specified no verification + /// - FatalError if a fatal error occurred, in which case an error has been printed to console + /// - VerificationCompleted if inference and verification completed, in which the out + /// parameters contain meaningful values + /// </summary> + public static PipelineOutcome InferAndVerify(Program program, + PipelineStatistics stats, + string programId = null, + ErrorReporterDelegate er = null, string requestId = null) + { + Contract.Requires(program != null); + Contract.Requires(stats != null); + Contract.Ensures(0 <= Contract.ValueAtReturn(out stats.InconclusiveCount) && 0 <= Contract.ValueAtReturn(out stats.TimeoutCount)); + + if (requestId == null) + { + requestId = FreshRequestId(); + } + + var start = DateTime.UtcNow; + + #region Do some pre-abstract-interpretation preprocessing on the program + // Doing lambda expansion before abstract interpretation means that the abstract interpreter + // never needs to see any lambda expressions. (On the other hand, if it were useful for it + // to see lambdas, then it would be better to more lambda expansion until after infererence.) + if (CommandLineOptions.Clo.ExpandLambdas) { + LambdaHelper.ExpandLambdas(program); + //PrintBplFile ("-", program, true); + } + #endregion + + #region Infer invariants using Abstract Interpretation + + // Always use (at least) intervals, if not specified otherwise (e.g. with the "/noinfer" switch) + if (CommandLineOptions.Clo.UseAbstractInterpretation) + { + if (!CommandLineOptions.Clo.Ai.J_Intervals && !CommandLineOptions.Clo.Ai.J_Trivial) + { + // use /infer:j as the default + CommandLineOptions.Clo.Ai.J_Intervals = true; + } + } + Microsoft.Boogie.AbstractInterpretation.NativeAbstractInterpretation.RunAbstractInterpretation(program); + + #endregion + + #region Do some post-abstract-interpretation preprocessing on the program (e.g., loop unrolling) + + if (CommandLineOptions.Clo.LoopUnrollCount != -1) + { + program.UnrollLoops(CommandLineOptions.Clo.LoopUnrollCount, CommandLineOptions.Clo.SoundLoopUnrolling); + } + + Dictionary<string, Dictionary<string, Block>> extractLoopMappingInfo = null; + if (CommandLineOptions.Clo.ExtractLoops) + { + extractLoopMappingInfo = program.ExtractLoops(); + } + + if (CommandLineOptions.Clo.PrintInstrumented) + { + program.Emit(new TokenTextWriter(Console.Out, CommandLineOptions.Clo.PrettyPrint)); + } + #endregion + + if (!CommandLineOptions.Clo.Verify) + { + return PipelineOutcome.Done; + } + + #region Run Houdini and verify + if (CommandLineOptions.Clo.ContractInfer) + { + return RunHoudini(program, stats, er); + } + #endregion + + #region Select and prioritize implementations that should be verified + + var impls = program.Implementations.Where( + impl => impl != null && CommandLineOptions.Clo.UserWantsToCheckRoutine(cce.NonNull(impl.Name)) && !impl.SkipVerification); + + // operate on a stable copy, in case it gets updated while we're running + Implementation[] stablePrioritizedImpls = null; + if (0 < CommandLineOptions.Clo.VerifySnapshots) + { + OtherDefinitionAxiomsCollector.Collect(program.Axioms); + DependencyCollector.Collect(program); + stablePrioritizedImpls = impls.OrderByDescending( + impl => impl.Priority != 1 ? impl.Priority : Cache.VerificationPriority(impl)).ToArray(); + } + else + { + stablePrioritizedImpls = impls.OrderByDescending(impl => impl.Priority).ToArray(); + } + + #endregion + + if (1 < CommandLineOptions.Clo.VerifySnapshots) + { + CachedVerificationResultInjector.Inject(program, stablePrioritizedImpls, requestId, programId, out stats.CachingActionCounts); + } + + #region Verify each implementation + + var outputCollector = new OutputCollector(stablePrioritizedImpls); + var outcome = PipelineOutcome.VerificationCompleted; + + try + { + var cts = new CancellationTokenSource(); + RequestIdToCancellationTokenSource.AddOrUpdate(requestId, cts, (k, ov) => cts); + + var tasks = new Task[stablePrioritizedImpls.Length]; + // We use this semaphore to limit the number of tasks that are currently executing. + var semaphore = new SemaphoreSlim(CommandLineOptions.Clo.VcsCores); + + // Create a task per implementation. + for (int i = 0; i < stablePrioritizedImpls.Length; i++) + { + var taskIndex = i; + var id = stablePrioritizedImpls[taskIndex].Id; + + CancellationTokenSource old; + if (ImplIdToCancellationTokenSource.TryGetValue(id, out old)) + { + old.Cancel(); + } + ImplIdToCancellationTokenSource.AddOrUpdate(id, cts, (k, ov) => cts); + + var t = new Task((dummy) => + { + try + { + if (outcome == PipelineOutcome.FatalError) + { + return; + } + if (cts.Token.IsCancellationRequested) + { + cts.Token.ThrowIfCancellationRequested(); + } + VerifyImplementation(program, stats, er, requestId, extractLoopMappingInfo, stablePrioritizedImpls, taskIndex, outputCollector, Checkers, programId); + ImplIdToCancellationTokenSource.TryRemove(id, out old); + } + finally + { + semaphore.Release(); + } + }, cts.Token, TaskCreationOptions.None); + tasks[taskIndex] = t; + } + + // Execute the tasks. + int j = 0; + for (; j < stablePrioritizedImpls.Length && outcome != PipelineOutcome.FatalError; j++) + { + try + { + semaphore.Wait(cts.Token); + } + catch (OperationCanceledException) + { + break; + } + tasks[j].Start(TaskScheduler.Default); + } + + // Don't wait for tasks that haven't been started yet. + tasks = tasks.Take(j).ToArray(); + Task.WaitAll(tasks); + } + catch (AggregateException ae) + { + ae.Handle(e => + { + var pe = e as ProverException; + if (pe != null) + { + printer.ErrorWriteLine(Console.Out, "Fatal Error: ProverException: {0}", e); + outcome = PipelineOutcome.FatalError; + return true; + } + var oce = e as OperationCanceledException; + if (oce != null) + { + return true; + } + return false; + }); + } + finally + { + CleanupCheckers(requestId); + } + + if (CommandLineOptions.Clo.PrintNecessaryAssumes && program.NecessaryAssumes.Any()) + { + Console.WriteLine("Necessary assume command(s): {0}", string.Join(", ", program.NecessaryAssumes)); + } + + cce.NonNull(CommandLineOptions.Clo.TheProverFactory).Close(); + + outputCollector.WriteMoreOutput(); + + if (1 < CommandLineOptions.Clo.VerifySnapshots && programId != null) + { + program.FreezeTopLevelDeclarations(); + programCache.Set(programId, program, policy); + } + + if (0 <= CommandLineOptions.Clo.VerifySnapshots && CommandLineOptions.Clo.TraceCachingForBenchmarking) + { + var end = DateTime.UtcNow; + if (TimePerRequest.Count == 0) + { + FirstRequestStart = start; + } + TimePerRequest[requestId] = end.Subtract(start); + StatisticsPerRequest[requestId] = stats; + + var printTimes = true; + + Console.Out.WriteLine(CachedVerificationResultInjector.Statistics.Output(printTimes)); + + Console.Out.WriteLine("Statistics per request as CSV:"); + var actions = string.Join(", ", Enum.GetNames(typeof(VC.ConditionGeneration.CachingAction))); + Console.Out.WriteLine("Request ID{0}, Error, E (C), Inconclusive, I (C), Out of Memory, OoM (C), Timeout, T (C), Verified, V (C), {1}", printTimes ? ", Time (ms)" : "", actions); + foreach (var kv in TimePerRequest.OrderBy(kv => ExecutionEngine.AutoRequestId(kv.Key))) + { + var s = StatisticsPerRequest[kv.Key]; + var cacs = s.CachingActionCounts; + var c = cacs != null ? ", " + cacs.Select(ac => string.Format("{0,3}", ac)).Concat(", ") : ""; + var t = printTimes ? string.Format(", {0,8:F0}", kv.Value.TotalMilliseconds) : ""; + Console.Out.WriteLine("{0,-19}{1}, {2,2}, {3,2}, {4,2}, {5,2}, {6,2}, {7,2}, {8,2}, {9,2}, {10,2}, {11,2}{12}", kv.Key, t, s.ErrorCount, s.CachedErrorCount, s.InconclusiveCount, s.CachedInconclusiveCount, s.OutOfMemoryCount, s.CachedOutOfMemoryCount, s.TimeoutCount, s.CachedTimeoutCount, s.VerifiedCount, s.CachedVerifiedCount, c); + } + + if (printTimes) + { + Console.Out.WriteLine(); + Console.Out.WriteLine("Total time (ms) since first request: {0:F0}", end.Subtract(FirstRequestStart).TotalMilliseconds); + } + } + + #endregion + + if (SecureVCGen.outfile != null) + SecureVCGen.outfile.Close(); + + return outcome; + } + + public static void CancelRequest(string requestId) + { + Contract.Requires(requestId != null); + + CancellationTokenSource cts; + if (RequestIdToCancellationTokenSource.TryGetValue(requestId, out cts)) + { + cts.Cancel(); + + CleanupCheckers(requestId); + } + } + + + private static void CleanupCheckers(string requestId) + { + if (requestId != null) + { + CancellationTokenSource old; + RequestIdToCancellationTokenSource.TryRemove(requestId, out old); + } + lock (RequestIdToCancellationTokenSource) + { + if (RequestIdToCancellationTokenSource.IsEmpty) + { + lock (Checkers) + { + foreach (Checker checker in Checkers) + { + Contract.Assert(checker != null); + checker.Close(); + } + } + } + } + } + + + private static void VerifyImplementation(Program program, PipelineStatistics stats, ErrorReporterDelegate er, string requestId, Dictionary<string, Dictionary<string, Block>> extractLoopMappingInfo, Implementation[] stablePrioritizedImpls, int index, OutputCollector outputCollector, List<Checker> checkers, string programId) + { + Implementation impl = stablePrioritizedImpls[index]; + VerificationResult verificationResult = null; + var output = new StringWriter(); + + printer.Inform("", output); // newline + printer.Inform(string.Format("Verifying {0} ...", impl.Name), output); + + int priority = 0; + var wasCached = false; + if (0 < CommandLineOptions.Clo.VerifySnapshots) { + var cachedResults = Cache.Lookup(impl, out priority); + if (cachedResults != null && priority == Priority.SKIP) { + if (CommandLineOptions.Clo.XmlSink != null) { + CommandLineOptions.Clo.XmlSink.WriteStartMethod(impl.Name, cachedResults.Start); + } + + printer.Inform(string.Format("Retrieving cached verification result for implementation {0}...", impl.Name), output); + if (CommandLineOptions.Clo.VerifySnapshots < 3 || cachedResults.Outcome == ConditionGeneration.Outcome.Correct) { + verificationResult = cachedResults; + wasCached = true; + } + } + } + + if (!wasCached) + { + #region Verify the implementation + + verificationResult = new VerificationResult(requestId, impl, programId); + + using (var vcgen = CreateVCGen(program, checkers)) + { + vcgen.CachingActionCounts = stats.CachingActionCounts; + verificationResult.ProofObligationCountBefore = vcgen.CumulativeAssertionCount; + verificationResult.Start = DateTime.UtcNow; + + if (CommandLineOptions.Clo.XmlSink != null) + { + CommandLineOptions.Clo.XmlSink.WriteStartMethod(impl.Name, verificationResult.Start); + } + try + { + if (CommandLineOptions.Clo.inferLeastForUnsat != null) + { + var svcgen = vcgen as VC.StratifiedVCGen; + Contract.Assert(svcgen != null); + var ss = new HashSet<string>(); + foreach (var c in program.Constants) + { + if (!c.Name.StartsWith(CommandLineOptions.Clo.inferLeastForUnsat)) continue; + ss.Add(c.Name); + } + verificationResult.Outcome = svcgen.FindLeastToVerify(impl, ref ss); + verificationResult.Errors = new List<Counterexample>(); + output.WriteLine("Result: {0}", string.Join(" ", ss)); + } + else + { + verificationResult.Outcome = vcgen.VerifyImplementation(impl, out verificationResult.Errors, requestId); + if (CommandLineOptions.Clo.ExtractLoops && verificationResult.Errors != null) + { + var vcg = vcgen as VCGen; + if (vcg != null) + { + for (int i = 0; i < verificationResult.Errors.Count; i++) + { + verificationResult.Errors[i] = vcg.extractLoopTrace(verificationResult.Errors[i], impl.Name, program, extractLoopMappingInfo); + } + } + } + } + } + catch (VCGenException e) + { + var errorInfo = errorInformationFactory.CreateErrorInformation(impl.tok, String.Format("{0} (encountered in implementation {1}).", e.Message, impl.Name), requestId, "Error"); + errorInfo.BoogieErrorCode = "BP5010"; + errorInfo.ImplementationName = impl.Name; + printer.WriteErrorInformation(errorInfo, output); + if (er != null) + { + lock (er) + { + er(errorInfo); + } + } + verificationResult.Errors = null; + verificationResult.Outcome = VCGen.Outcome.Inconclusive; + } + catch (UnexpectedProverOutputException upo) + { + printer.AdvisoryWriteLine("Advisory: {0} SKIPPED because of internal error: unexpected prover output: {1}", impl.Name, upo.Message); + verificationResult.Errors = null; + verificationResult.Outcome = VCGen.Outcome.Inconclusive; + } + + verificationResult.ProofObligationCountAfter = vcgen.CumulativeAssertionCount; + verificationResult.End = DateTime.UtcNow; + } + + #endregion + + #region Cache the verification result + + if (0 < CommandLineOptions.Clo.VerifySnapshots && !string.IsNullOrEmpty(impl.Checksum)) + { + Cache.Insert(impl, verificationResult); + } + + #endregion + } + + #region Process the verification results and statistics + + ProcessOutcome(verificationResult.Outcome, verificationResult.Errors, TimeIndication(verificationResult), stats, output, impl.TimeLimit, er, verificationResult.ImplementationName, verificationResult.ImplementationToken, verificationResult.RequestId, wasCached); + + ProcessErrors(verificationResult.Errors, verificationResult.Outcome, output, er, impl); + + if (CommandLineOptions.Clo.XmlSink != null) + { + CommandLineOptions.Clo.XmlSink.WriteEndMethod(verificationResult.Outcome.ToString().ToLowerInvariant(), verificationResult.End, verificationResult.End - verificationResult.Start); + } + + outputCollector.Add(index, output); + + outputCollector.WriteMoreOutput(); + + if (verificationResult.Outcome == VCGen.Outcome.Errors || CommandLineOptions.Clo.Trace) + { + Console.Out.Flush(); + } + + #endregion + } + + + class OutputCollector + { + StringWriter[] outputs; + + int nextPrintableIndex = 0; + + public OutputCollector(Implementation[] implementations) + { + outputs = new StringWriter[implementations.Length]; + } + + public void WriteMoreOutput() + { + lock (outputs) + { + for (; nextPrintableIndex < outputs.Length && outputs[nextPrintableIndex] != null; nextPrintableIndex++) + { + Console.Write(outputs[nextPrintableIndex].ToString()); + outputs[nextPrintableIndex] = null; + Console.Out.Flush(); + } + } + } + + public void Add(int index, StringWriter output) + { + Contract.Requires(0 <= index && index < outputs.Length); + Contract.Requires(output != null); + + lock (this) + { + outputs[index] = output; + } + } + } + + + private static ConditionGeneration CreateVCGen(Program program, List<Checker> checkers) + { + ConditionGeneration vcgen = null; + if (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed) + { + vcgen = new DCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers); + } + else if (CommandLineOptions.Clo.FixedPointEngine != null) + { + vcgen = new FixedpointVC(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers); + } + else if (CommandLineOptions.Clo.StratifiedInlining > 0) + { + vcgen = new StratifiedVCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers); + } + else if (CommandLineOptions.Clo.SecureVcGen != null) + { + vcgen = new SecureVCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers); + } + else + { + vcgen = new VCGen(program, CommandLineOptions.Clo.SimplifyLogFilePath, CommandLineOptions.Clo.SimplifyLogFileAppend, checkers); + } + return vcgen; + } + + + #region Houdini + + private static PipelineOutcome RunHoudini(Program program, PipelineStatistics stats, ErrorReporterDelegate er) + { + Contract.Requires(stats != null); + + if (CommandLineOptions.Clo.AbstractHoudini != null) + { + return RunAbstractHoudini(program, stats, er); + } + + if (CommandLineOptions.Clo.StagedHoudini != null) + { + return RunStagedHoudini(program, stats, er); + } + + Houdini.HoudiniSession.HoudiniStatistics houdiniStats = new Houdini.HoudiniSession.HoudiniStatistics(); + Houdini.Houdini houdini = new Houdini.Houdini(program, houdiniStats); + Houdini.HoudiniOutcome outcome = houdini.PerformHoudiniInference(); + houdini.Close(); + + if (CommandLineOptions.Clo.PrintAssignment) + { + Console.WriteLine("Assignment computed by Houdini:"); + foreach (var x in outcome.assignment) + { + Console.WriteLine(x.Key + " = " + x.Value); + } + } + + if (CommandLineOptions.Clo.Trace) + { + int numTrueAssigns = 0; + foreach (var x in outcome.assignment) + { + if (x.Value) + numTrueAssigns++; + } + Console.WriteLine("Number of true assignments = " + numTrueAssigns); + Console.WriteLine("Number of false assignments = " + (outcome.assignment.Count - numTrueAssigns)); + Console.WriteLine("Prover time = " + houdiniStats.proverTime.ToString("F2")); + Console.WriteLine("Unsat core prover time = " + houdiniStats.unsatCoreProverTime.ToString("F2")); + Console.WriteLine("Number of prover queries = " + houdiniStats.numProverQueries); + Console.WriteLine("Number of unsat core prover queries = " + houdiniStats.numUnsatCoreProverQueries); + Console.WriteLine("Number of unsat core prunings = " + houdiniStats.numUnsatCorePrunings); + } + + foreach (Houdini.VCGenOutcome x in outcome.implementationOutcomes.Values) + { + ProcessOutcome(x.outcome, x.errors, "", stats, Console.Out, CommandLineOptions.Clo.ProverKillTime, er); + ProcessErrors(x.errors, x.outcome, Console.Out, er); + } + + return PipelineOutcome.Done; + } + + public static Program ProgramFromFile(string filename) { + Program p = ParseBoogieProgram(new List<string> { filename }, false); + System.Diagnostics.Debug.Assert(p != null); + LinearTypeChecker linearTypeChecker; + CivlTypeChecker civlTypeChecker; + PipelineOutcome oc = ExecutionEngine.ResolveAndTypecheck(p, filename, out linearTypeChecker, out civlTypeChecker); + System.Diagnostics.Debug.Assert(oc == PipelineOutcome.ResolvedAndTypeChecked); + return p; + } + + private static PipelineOutcome RunStagedHoudini(Program program, PipelineStatistics stats, ErrorReporterDelegate er) + { + Houdini.HoudiniSession.HoudiniStatistics houdiniStats = new Houdini.HoudiniSession.HoudiniStatistics(); + Houdini.StagedHoudini stagedHoudini = new Houdini.StagedHoudini(program, houdiniStats, ProgramFromFile); + Houdini.HoudiniOutcome outcome = stagedHoudini.PerformStagedHoudiniInference(); + + if (CommandLineOptions.Clo.PrintAssignment) + { + Console.WriteLine("Assignment computed by Houdini:"); + foreach (var x in outcome.assignment) + { + Console.WriteLine(x.Key + " = " + x.Value); + } + } + + if (CommandLineOptions.Clo.Trace) + { + int numTrueAssigns = 0; + foreach (var x in outcome.assignment) + { + if (x.Value) + numTrueAssigns++; + } + Console.WriteLine("Number of true assignments = " + numTrueAssigns); + Console.WriteLine("Number of false assignments = " + (outcome.assignment.Count - numTrueAssigns)); + Console.WriteLine("Prover time = " + houdiniStats.proverTime.ToString("F2")); + Console.WriteLine("Unsat core prover time = " + houdiniStats.unsatCoreProverTime.ToString("F2")); + Console.WriteLine("Number of prover queries = " + houdiniStats.numProverQueries); + Console.WriteLine("Number of unsat core prover queries = " + houdiniStats.numUnsatCoreProverQueries); + Console.WriteLine("Number of unsat core prunings = " + houdiniStats.numUnsatCorePrunings); + } + + foreach (Houdini.VCGenOutcome x in outcome.implementationOutcomes.Values) + { + ProcessOutcome(x.outcome, x.errors, "", stats, Console.Out, CommandLineOptions.Clo.ProverKillTime, er); + ProcessErrors(x.errors, x.outcome, Console.Out, er); + } + + return PipelineOutcome.Done; + + } + + + private static PipelineOutcome RunAbstractHoudini(Program program, PipelineStatistics stats, ErrorReporterDelegate er) + { + Contract.Requires(stats != null); + + //CommandLineOptions.Clo.PrintErrorModel = 1; + CommandLineOptions.Clo.UseProverEvaluate = true; + CommandLineOptions.Clo.ModelViewFile = "z3model"; + CommandLineOptions.Clo.UseArrayTheory = true; + CommandLineOptions.Clo.TypeEncodingMethod = CommandLineOptions.TypeEncoding.Monomorphic; + Houdini.AbstractDomainFactory.Initialize(program); + var domain = Houdini.AbstractDomainFactory.GetInstance(CommandLineOptions.Clo.AbstractHoudini); + + // Run Abstract Houdini + var abs = new Houdini.AbsHoudini(program, domain); + var absout = abs.ComputeSummaries(); + ProcessOutcome(absout.outcome, absout.errors, "", stats, Console.Out, CommandLineOptions.Clo.ProverKillTime, er); + ProcessErrors(absout.errors, absout.outcome, Console.Out, er); + + //Houdini.PredicateAbs.Initialize(program); + //var abs = new Houdini.AbstractHoudini(program); + //abs.computeSummaries(new Houdini.PredicateAbs(program.TopLevelDeclarations.OfType<Implementation>().First().Name)); + + return PipelineOutcome.Done; + } + + #endregion + + + private static string TimeIndication(VerificationResult verificationResult) + { + var result = ""; + if (CommandLineOptions.Clo.Trace) + { + result = string.Format(" [{0:F3} s, {1} proof obligation{2}] ", (verificationResult.End - verificationResult.Start).TotalSeconds, verificationResult.ProofObligationCount, verificationResult.ProofObligationCount == 1 ? "" : "s"); + } + else if (CommandLineOptions.Clo.TraceProofObligations) + { + result = string.Format(" [{0} proof obligation{1}] ", verificationResult.ProofObligationCount, verificationResult.ProofObligationCount == 1 ? "" : "s"); + } + return result; + } + + + private static void ProcessOutcome(VC.VCGen.Outcome outcome, List<Counterexample> errors, string timeIndication, + PipelineStatistics stats, TextWriter tw, int timeLimit, ErrorReporterDelegate er = null, string implName = null, IToken implTok = null, string requestId = null, bool wasCached = false) + { + Contract.Requires(stats != null); + + UpdateStatistics(stats, outcome, errors, wasCached); + + printer.Inform(timeIndication + OutcomeIndication(outcome, errors), tw); + + ReportOutcome(outcome, er, implName, implTok, requestId, tw, timeLimit, errors); + } + + + private static void ReportOutcome(VC.VCGen.Outcome outcome, ErrorReporterDelegate er, string implName, IToken implTok, string requestId, TextWriter tw, int timeLimit, List<Counterexample> errors) + { + ErrorInformation errorInfo = null; + + switch (outcome) + { + case VCGen.Outcome.ReachedBound: + tw.WriteLine(string.Format("Stratified Inlining: Reached recursion bound of {0}", CommandLineOptions.Clo.RecursionBound)); + break; + case VCGen.Outcome.Errors: + case VCGen.Outcome.TimedOut: + if (implName != null && implTok != null) + { + if (outcome == ConditionGeneration.Outcome.TimedOut || (errors != null && errors.Any(e => e.IsAuxiliaryCexForDiagnosingTimeouts))) + { + errorInfo = errorInformationFactory.CreateErrorInformation(implTok, string.Format("Verification of '{1}' timed out after {0} seconds", timeLimit, implName), requestId); + } + + // Report timed out assertions as auxiliary info. + if (errors != null) + { + var cmpr = new CounterexampleComparer(); + var timedOutAssertions = errors.Where(e => e.IsAuxiliaryCexForDiagnosingTimeouts).Distinct(cmpr).ToList(); + timedOutAssertions.Sort(cmpr); + if (0 < timedOutAssertions.Count) + { + errorInfo.Msg += string.Format(" with {0} check(s) that timed out individually", timedOutAssertions.Count); + } + foreach (Counterexample error in timedOutAssertions) + { + var callError = error as CallCounterexample; + var returnError = error as ReturnCounterexample; + var assertError = error as AssertCounterexample; + IToken tok = null; + string msg = null; + if (callError != null) + { + tok = callError.FailingCall.tok; + msg = callError.FailingCall.ErrorData as string ?? "A precondition for this call might not hold."; + } + else if (returnError != null) + { + tok = returnError.FailingReturn.tok; + msg = "A postcondition might not hold on this return path."; + } + else + { + tok = assertError.FailingAssert.tok; + if (assertError.FailingAssert is LoopInitAssertCmd) + { + msg = "This loop invariant might not hold on entry."; + } + else if (assertError.FailingAssert is LoopInvMaintainedAssertCmd) + { + msg = "This loop invariant might not be maintained by the loop."; + } + else + { + msg = assertError.FailingAssert.ErrorData as string; + if (!CommandLineOptions.Clo.ForceBplErrors && assertError.FailingAssert.ErrorMessage != null) + { + msg = assertError.FailingAssert.ErrorMessage; + } + if (msg == null) + { + msg = "This assertion might not hold."; + } + } + } + errorInfo.AddAuxInfo(tok, msg, "Unverified check due to timeout"); + } + } + } + break; + case VCGen.Outcome.OutOfMemory: + if (implName != null && implTok != null) + { + errorInfo = errorInformationFactory.CreateErrorInformation(implTok, "Verification out of memory (" + implName + ")", requestId); + } + break; + case VCGen.Outcome.Inconclusive: + if (implName != null && implTok != null) + { + errorInfo = errorInformationFactory.CreateErrorInformation(implTok, "Verification inconclusive (" + implName + ")", requestId); + } + break; + } + + if (errorInfo != null) + { + errorInfo.ImplementationName = implName; + if (er != null) + { + lock (er) + { + er(errorInfo); + } + } + else + { + printer.WriteErrorInformation(errorInfo, tw); + } + } + } + + + private static string OutcomeIndication(VC.VCGen.Outcome outcome, List<Counterexample> errors) + { + string traceOutput = ""; + switch (outcome) + { + default: + Contract.Assert(false); // unexpected outcome + throw new cce.UnreachableException(); + case VCGen.Outcome.ReachedBound: + traceOutput = "verified"; + break; + case VCGen.Outcome.Correct: + traceOutput = (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed ? "credible" : "verified"); + break; + case VCGen.Outcome.TimedOut: + traceOutput = "timed out"; + break; + case VCGen.Outcome.OutOfMemory: + traceOutput = "out of memory"; + break; + case VCGen.Outcome.Inconclusive: + traceOutput = "inconclusive"; + break; + case VCGen.Outcome.Errors: + Contract.Assert(errors != null); + traceOutput = (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed ? "doomed" : string.Format("error{0}", errors.Count == 1 ? "" : "s")); + break; + } + return traceOutput; + } + + + private static void UpdateStatistics(PipelineStatistics stats, VC.VCGen.Outcome outcome, List<Counterexample> errors, bool wasCached) + { + Contract.Requires(stats != null); + + switch (outcome) + { + default: + Contract.Assert(false); // unexpected outcome + throw new cce.UnreachableException(); + case VCGen.Outcome.ReachedBound: + Interlocked.Increment(ref stats.VerifiedCount); + if (wasCached) { Interlocked.Increment(ref stats.CachedVerifiedCount); } + break; + case VCGen.Outcome.Correct: + Interlocked.Increment(ref stats.VerifiedCount); + if (wasCached) { Interlocked.Increment(ref stats.CachedVerifiedCount); } + break; + case VCGen.Outcome.TimedOut: + Interlocked.Increment(ref stats.TimeoutCount); + if (wasCached) { Interlocked.Increment(ref stats.CachedTimeoutCount); } + break; + case VCGen.Outcome.OutOfMemory: + Interlocked.Increment(ref stats.OutOfMemoryCount); + if (wasCached) { Interlocked.Increment(ref stats.CachedOutOfMemoryCount); } + break; + case VCGen.Outcome.Inconclusive: + Interlocked.Increment(ref stats.InconclusiveCount); + if (wasCached) { Interlocked.Increment(ref stats.CachedInconclusiveCount); } + break; + case VCGen.Outcome.Errors: + if (CommandLineOptions.Clo.vcVariety == CommandLineOptions.VCVariety.Doomed) + { + Interlocked.Increment(ref stats.ErrorCount); + if (wasCached) { Interlocked.Increment(ref stats.CachedErrorCount); } + } + else + { + int cnt = errors.Where(e => !e.IsAuxiliaryCexForDiagnosingTimeouts).Count(); + Interlocked.Add(ref stats.ErrorCount, cnt); + if (wasCached) { Interlocked.Add(ref stats.CachedErrorCount, cnt); } + } + break; + } + } + + + private static void ProcessErrors(List<Counterexample> errors, VC.VCGen.Outcome outcome, TextWriter tw, ErrorReporterDelegate er, Implementation impl = null) + { + var implName = impl != null ? impl.Name : null; + + if (errors != null) + { + errors.Sort(new CounterexampleComparer()); + foreach (Counterexample error in errors) + { + if (error.IsAuxiliaryCexForDiagnosingTimeouts) + { + continue; + } + var errorInfo = CreateErrorInformation(error, outcome); + errorInfo.ImplementationName = implName; + + if (CommandLineOptions.Clo.XmlSink != null) + { + WriteErrorInformationToXmlSink(errorInfo, error.Trace); + } + + if (CommandLineOptions.Clo.EnhancedErrorMessages == 1) + { + foreach (string info in error.relatedInformation) + { + Contract.Assert(info != null); + errorInfo.Out.WriteLine(" " + info); + } + } + if (CommandLineOptions.Clo.ErrorTrace > 0) + { + errorInfo.Out.WriteLine("Execution trace:"); + error.Print(4, errorInfo.Out, b => { errorInfo.AddAuxInfo(b.tok, b.Label, "Execution trace"); }); + } + if (CommandLineOptions.Clo.ModelViewFile != null) + { + error.PrintModel(errorInfo.Model); + } + + printer.WriteErrorInformation(errorInfo, tw); + + if (er != null) + { + lock (er) + { + er(errorInfo); + } + } + } + } + } + + + private static ErrorInformation CreateErrorInformation(Counterexample error, VC.VCGen.Outcome outcome) + { + // BP1xxx: Parsing errors + // BP2xxx: Name resolution errors + // BP3xxx: Typechecking errors + // BP4xxx: Abstract interpretation errors (Is there such a thing?) + // BP5xxx: Verification errors + + ErrorInformation errorInfo; + var cause = "Error"; + if (outcome == VCGen.Outcome.TimedOut) + { + cause = "Timed out on"; + } + else if (outcome == VCGen.Outcome.OutOfMemory) + { + cause = "Out of memory on"; + } + + var callError = error as CallCounterexample; + var returnError = error as ReturnCounterexample; + var assertError = error as AssertCounterexample; + if (callError != null) + { + errorInfo = errorInformationFactory.CreateErrorInformation(callError.FailingCall.tok, callError.FailingCall.ErrorData as string ?? "A precondition for this call might not hold.", callError.RequestId, callError.OriginalRequestId, cause); + errorInfo.BoogieErrorCode = "BP5002"; + errorInfo.Kind = ErrorKind.Precondition; + errorInfo.AddAuxInfo(callError.FailingRequires.tok, callError.FailingRequires.ErrorData as string ?? "This is the precondition that might not hold.", "Related location"); + + if (!CommandLineOptions.Clo.ForceBplErrors && callError.FailingRequires.ErrorMessage != null) + { + errorInfo = errorInformationFactory.CreateErrorInformation(null, callError.FailingRequires.ErrorMessage, callError.RequestId, callError.OriginalRequestId, cause); + } + } + else if (returnError != null) + { + errorInfo = errorInformationFactory.CreateErrorInformation(returnError.FailingReturn.tok, "A postcondition might not hold on this return path.", returnError.RequestId, returnError.OriginalRequestId, cause); + errorInfo.BoogieErrorCode = "BP5003"; + errorInfo.Kind = ErrorKind.Postcondition; + errorInfo.AddAuxInfo(returnError.FailingEnsures.tok, returnError.FailingEnsures.ErrorData as string ?? "This is the postcondition that might not hold.", "Related location"); + + if (!CommandLineOptions.Clo.ForceBplErrors && returnError.FailingEnsures.ErrorMessage != null) + { + errorInfo = errorInformationFactory.CreateErrorInformation(null, returnError.FailingEnsures.ErrorMessage, returnError.RequestId, returnError.OriginalRequestId, cause); + } + } + else // error is AssertCounterexample + { + if (assertError.FailingAssert is LoopInitAssertCmd) + { + errorInfo = errorInformationFactory.CreateErrorInformation(assertError.FailingAssert.tok, "This loop invariant might not hold on entry.", assertError.RequestId, assertError.OriginalRequestId, cause); + errorInfo.BoogieErrorCode = "BP5004"; + errorInfo.Kind = ErrorKind.InvariantEntry; + } + else if (assertError.FailingAssert is LoopInvMaintainedAssertCmd) + { + errorInfo = errorInformationFactory.CreateErrorInformation(assertError.FailingAssert.tok, "This loop invariant might not be maintained by the loop.", assertError.RequestId, assertError.OriginalRequestId, cause); + errorInfo.BoogieErrorCode = "BP5005"; + errorInfo.Kind = ErrorKind.InvariantMaintainance; + } + else + { + var msg = assertError.FailingAssert.ErrorData as string; + var tok = assertError.FailingAssert.tok; + if (!CommandLineOptions.Clo.ForceBplErrors && assertError.FailingAssert.ErrorMessage != null) + { + msg = assertError.FailingAssert.ErrorMessage; + tok = null; + if (cause == "Error") + { + cause = null; + } + } + string bec = null; + if (msg == null) + { + msg = "This assertion might not hold."; + bec = "BP5001"; + } + + errorInfo = errorInformationFactory.CreateErrorInformation(tok, msg, assertError.RequestId, assertError.OriginalRequestId, cause); + errorInfo.BoogieErrorCode = bec; + errorInfo.Kind = ErrorKind.Assertion; + } + } + + return errorInfo; + } + + + private static void WriteErrorInformationToXmlSink(ErrorInformation errorInfo, List<Block> trace) + { + var msg = "assertion violation"; + switch (errorInfo.Kind) + { + case ErrorKind.Precondition: + msg = "precondition violation"; + break; + + case ErrorKind.Postcondition: + msg = "postcondition violation"; + break; + + case ErrorKind.InvariantEntry: + msg = "loop invariant entry violation"; + break; + + case ErrorKind.InvariantMaintainance: + msg = "loop invariant maintenance violation"; + break; + } + + var relatedError = errorInfo.Aux.FirstOrDefault(); + CommandLineOptions.Clo.XmlSink.WriteError(msg, errorInfo.Tok, relatedError.Tok, trace); + } + + } + +} diff --git a/Source/ExecutionEngine/ExecutionEngine.csproj b/Source/ExecutionEngine/ExecutionEngine.csproj index 09393f09..b17b1139 100644 --- a/Source/ExecutionEngine/ExecutionEngine.csproj +++ b/Source/ExecutionEngine/ExecutionEngine.csproj @@ -1,194 +1,194 @@ -<?xml version="1.0" encoding="utf-8"?>
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<CodeContractsInferEnsuresAutoProperties>True</CodeContractsInferEnsuresAutoProperties> + <CodeContractsInferObjectInvariants>False</CodeContractsInferObjectInvariants> + <CodeContractsSuggestAssumptions>False</CodeContractsSuggestAssumptions> + <CodeContractsSuggestAssumptionsForCallees>False</CodeContractsSuggestAssumptionsForCallees> + <CodeContractsSuggestRequires>False</CodeContractsSuggestRequires> + <CodeContractsNecessaryEnsures>True</CodeContractsNecessaryEnsures> + <CodeContractsSuggestObjectInvariants>False</CodeContractsSuggestObjectInvariants> + <CodeContractsSuggestReadonly>True</CodeContractsSuggestReadonly> + <CodeContractsRunInBackground>True</CodeContractsRunInBackground> + <CodeContractsShowSquigglies>True</CodeContractsShowSquigglies> + <CodeContractsUseBaseLine>False</CodeContractsUseBaseLine> + <CodeContractsEmitXMLDocs>False</CodeContractsEmitXMLDocs> + <CodeContractsCustomRewriterAssembly /> + <CodeContractsCustomRewriterClass /> + <CodeContractsLibPaths /> + <CodeContractsExtraRewriteOptions /> + <CodeContractsExtraAnalysisOptions /> + <CodeContractsSQLServerOption /> + <CodeContractsBaseLineFile /> + <CodeContractsCacheAnalysisResults>True</CodeContractsCacheAnalysisResults> + <CodeContractsSkipAnalysisIfCannotConnectToCache>False</CodeContractsSkipAnalysisIfCannotConnectToCache> + <CodeContractsFailBuildOnWarnings>False</CodeContractsFailBuildOnWarnings> + <CodeContractsBeingOptimisticOnExternal>True</CodeContractsBeingOptimisticOnExternal> + <CodeContractsRuntimeCheckingLevel>Full</CodeContractsRuntimeCheckingLevel> + <CodeContractsReferenceAssembly>DoNotBuild</CodeContractsReferenceAssembly> + <CodeContractsAnalysisWarningLevel>0</CodeContractsAnalysisWarningLevel> + </PropertyGroup> + <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "> + <DebugType>pdbonly</DebugType> + <Optimize>true</Optimize> + <OutputPath>..\..\Binaries\</OutputPath> + <DefineConstants>TRACE</DefineConstants> + <ErrorReport>prompt</ErrorReport> + <WarningLevel>4</WarningLevel> + <CodeContractsEnableRuntimeChecking>False</CodeContractsEnableRuntimeChecking> + <CodeContractsRuntimeOnlyPublicSurface>False</CodeContractsRuntimeOnlyPublicSurface> + <CodeContractsRuntimeThrowOnFailure>True</CodeContractsRuntimeThrowOnFailure> + <CodeContractsRuntimeCallSiteRequires>False</CodeContractsRuntimeCallSiteRequires> + <CodeContractsRuntimeSkipQuantifiers>False</CodeContractsRuntimeSkipQuantifiers> + <CodeContractsRunCodeAnalysis>False</CodeContractsRunCodeAnalysis> + <CodeContractsNonNullObligations>True</CodeContractsNonNullObligations> + <CodeContractsBoundsObligations>True</CodeContractsBoundsObligations> + <CodeContractsArithmeticObligations>False</CodeContractsArithmeticObligations> + <CodeContractsEnumObligations>False</CodeContractsEnumObligations> + <CodeContractsRedundantAssumptions>False</CodeContractsRedundantAssumptions> + <CodeContractsMissingPublicRequiresAsWarnings>True</CodeContractsMissingPublicRequiresAsWarnings> + <CodeContractsInferRequires>True</CodeContractsInferRequires> + <CodeContractsInferEnsures>False</CodeContractsInferEnsures> + <CodeContractsInferObjectInvariants>False</CodeContractsInferObjectInvariants> + <CodeContractsSuggestAssumptions>False</CodeContractsSuggestAssumptions> + <CodeContractsSuggestRequires>True</CodeContractsSuggestRequires> + <CodeContractsSuggestObjectInvariants>False</CodeContractsSuggestObjectInvariants> + <CodeContractsRunInBackground>True</CodeContractsRunInBackground> + <CodeContractsShowSquigglies>True</CodeContractsShowSquigglies> + <CodeContractsUseBaseLine>False</CodeContractsUseBaseLine> + <CodeContractsEmitXMLDocs>False</CodeContractsEmitXMLDocs> + <CodeContractsCustomRewriterAssembly /> + <CodeContractsCustomRewriterClass /> + <CodeContractsLibPaths /> + <CodeContractsExtraRewriteOptions /> + <CodeContractsExtraAnalysisOptions /> + <CodeContractsSQLServerOption /> + <CodeContractsBaseLineFile /> + <CodeContractsCacheAnalysisResults>True</CodeContractsCacheAnalysisResults> + <CodeContractsFailBuildOnWarnings>False</CodeContractsFailBuildOnWarnings> + <CodeContractsRuntimeCheckingLevel>Full</CodeContractsRuntimeCheckingLevel> + <CodeContractsReferenceAssembly>DoNotBuild</CodeContractsReferenceAssembly> + <CodeContractsAnalysisWarningLevel>0</CodeContractsAnalysisWarningLevel> + </PropertyGroup> + <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'QED|AnyCPU'"> + <DebugSymbols>true</DebugSymbols> + <OutputPath>bin\QED\</OutputPath> + <DefineConstants>TRACE;DEBUG;QED</DefineConstants> + <DebugType>full</DebugType> + <PlatformTarget>AnyCPU</PlatformTarget> + <ErrorReport>prompt</ErrorReport> + <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet> + </PropertyGroup> + <ItemGroup> + <Reference Include="System" /> + <Reference Include="System.Core" /> + <Reference Include="System.Runtime.Caching" /> + <Reference Include="System.Xml.Linq" /> + </ItemGroup> + <ItemGroup> + <Compile Include="ExecutionEngine.cs" /> + <Compile Include="Properties\AssemblyInfo.cs" /> + <Compile Include="VerificationResultCache.cs" /> + </ItemGroup> + <ItemGroup> + <ProjectReference Include="..\AbsInt\AbsInt.csproj"> + <Project>{0EFA3E43-690B-48DC-A72C-384A3EA7F31F}</Project> + <Name>AbsInt</Name> + </ProjectReference> + <ProjectReference Include="..\Basetypes\Basetypes.csproj"> + <Project>{43DFAD18-3E35-4558-9BE2-CAFF6B5BA8A0}</Project> + <Name>Basetypes</Name> + </ProjectReference> + <ProjectReference Include="..\CodeContractsExtender\CodeContractsExtender.csproj"> + <Project>{ACCC0156-0921-43ED-8F67-AD8BDC8CDE31}</Project> + <Name>CodeContractsExtender</Name> + </ProjectReference> + <ProjectReference Include="..\Concurrency\Concurrency.csproj"> + <Project>{d07b8e38-e172-47f4-ad02-0373014a46d3}</Project> + <Name>Concurrency</Name> + </ProjectReference> + <ProjectReference Include="..\Core\Core.csproj"> + <Project>{B230A69C-C466-4065-B9C1-84D80E76D802}</Project> + <Name>Core</Name> + </ProjectReference> + <ProjectReference Include="..\Doomed\Doomed.csproj"> + <Project>{884386A3-58E9-40BB-A273-B24976775553}</Project> + <Name>Doomed</Name> + </ProjectReference> + <ProjectReference Include="..\Graph\Graph.csproj"> + <Project>{69A2B0B8-BCAC-4101-AE7A-556FCC58C06E}</Project> + <Name>Graph</Name> + </ProjectReference> + <ProjectReference Include="..\Houdini\Houdini.csproj"> + <Project>{CF41E903-78EB-43BA-A355-E5FEB5ECECD4}</Project> + <Name>Houdini</Name> + </ProjectReference> + <ProjectReference Include="..\Model\Model.csproj"> + <Project>{ACEF88D5-DADD-46DA-BAE1-2144D63F4C83}</Project> + <Name>Model</Name> + </ProjectReference> + <ProjectReference Include="..\ParserHelper\ParserHelper.csproj"> + <Project>{FCD3AC7F-9DFD-46C8-AB1E-09F0B0F16DC5}</Project> + <Name>ParserHelper</Name> + </ProjectReference> + <ProjectReference Include="..\Predication\Predication.csproj"> + <Project>{AFAA5CE1-C41B-44F0-88F8-FD8A43826D44}</Project> + <Name>Predication</Name> + </ProjectReference> + <ProjectReference Include="..\VCGeneration\VCGeneration.csproj"> + <Project>{E1F10180-C7B9-4147-B51F-FA1B701966DC}</Project> + <Name>VCGeneration</Name> + </ProjectReference> + </ItemGroup> + <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" /> + <!-- To modify your build process, add your task inside one of the targets below and uncomment it. + Other similar extension points exist, see Microsoft.Common.targets. + <Target Name="BeforeBuild"> + </Target> + <Target Name="AfterBuild"> + </Target> + --> </Project>
\ No newline at end of file diff --git a/Source/ExecutionEngine/Properties/AssemblyInfo.cs b/Source/ExecutionEngine/Properties/AssemblyInfo.cs index 5977e799..ea288b03 100644 --- a/Source/ExecutionEngine/Properties/AssemblyInfo.cs +++ b/Source/ExecutionEngine/Properties/AssemblyInfo.cs @@ -1,36 +1,36 @@ -using System.Reflection;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-// General Information about an assembly is controlled through the following
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-[assembly: AssemblyTitle("ExecutionEngine")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("ExecutionEngine")]
-[assembly: AssemblyCopyright("Copyright © 2013")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-// Setting ComVisible to false makes the types in this assembly not visible
-// to COM components. If you need to access a type in this assembly from
-// COM, set the ComVisible attribute to true on that type.
-[assembly: ComVisible(false)]
-
-// The following GUID is for the ID of the typelib if this project is exposed to COM
-[assembly: Guid("03fff764-c3f0-4e42-a897-a1c151b3fe6d")]
-
-// Version information for an assembly consists of the following four values:
-//
-// Major Version
-// Minor Version
-// Build Number
-// Revision
-//
-// You can specify all the values or you can default the Build and Revision Numbers
-// by using the '*' as shown below:
-// [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+using System.Reflection; +using System.Runtime.CompilerServices; +using System.Runtime.InteropServices; + +// General Information about an assembly is controlled through the following +// set of attributes. Change these attribute values to modify the information +// associated with an assembly. +[assembly: AssemblyTitle("ExecutionEngine")] +[assembly: AssemblyDescription("")] +[assembly: AssemblyConfiguration("")] +[assembly: AssemblyCompany("")] +[assembly: AssemblyProduct("ExecutionEngine")] +[assembly: AssemblyCopyright("Copyright © 2013")] +[assembly: AssemblyTrademark("")] +[assembly: AssemblyCulture("")] + +// Setting ComVisible to false makes the types in this assembly not visible +// to COM components. If you need to access a type in this assembly from +// COM, set the ComVisible attribute to true on that type. +[assembly: ComVisible(false)] + +// The following GUID is for the ID of the typelib if this project is exposed to COM +[assembly: Guid("03fff764-c3f0-4e42-a897-a1c151b3fe6d")] + +// Version information for an assembly consists of the following four values: +// +// Major Version +// Minor Version +// Build Number +// Revision +// +// You can specify all the values or you can default the Build and Revision Numbers +// by using the '*' as shown below: +// [assembly: AssemblyVersion("1.0.*")] +[assembly: AssemblyVersion("1.0.0.0")] +[assembly: AssemblyFileVersion("1.0.0.0")] diff --git a/Source/ExecutionEngine/VerificationResultCache.cs b/Source/ExecutionEngine/VerificationResultCache.cs index 5d20e6e8..3159238c 100644 --- a/Source/ExecutionEngine/VerificationResultCache.cs +++ b/Source/ExecutionEngine/VerificationResultCache.cs @@ -1,640 +1,692 @@ -using System;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Diagnostics.Contracts;
-using System.IO;
-using System.Linq;
-using System.Runtime.Caching;
-using System.Text;
-using System.Text.RegularExpressions;
-using VC;
-
-namespace Microsoft.Boogie
-{
-
- struct CachedVerificationResultInjectorRun
- {
- public DateTime Start { get; internal set; }
- public DateTime End { get; internal set; }
- public int TransformedImplementationCount { get; internal set; }
- public int ImplementationCount { get; internal set; }
- public int SkippedImplementationCount { get; set; }
- public int LowPriorityImplementationCount { get; set; }
- public int MediumPriorityImplementationCount { get; set; }
- public int HighPriorityImplementationCount { get; set; }
- public long[] CachingActionCounts { get; set; }
- }
-
-
- sealed class CachedVerificationResultInjectorStatistics
- {
- ConcurrentDictionary<string, CachedVerificationResultInjectorRun> runs = new ConcurrentDictionary<string, CachedVerificationResultInjectorRun>();
-
- public bool AddRun(string requestId, CachedVerificationResultInjectorRun run)
- {
- return runs.TryAdd(requestId, run);
- }
-
- public string Output(bool printTime = false)
- {
- var wr = new StringWriter();
- if (runs.Any())
- {
- wr.WriteLine("Cached verification result injector statistics as CSV:");
- wr.WriteLine("Request ID, Transformed, Low, Medium, High, Skipped{0}", printTime ? ", Time (ms)" : "");
- foreach (var kv in runs.OrderBy(kv => ExecutionEngine.AutoRequestId(kv.Key)))
- {
- var t = printTime ? string.Format(", {0,8:F0}", kv.Value.End.Subtract(kv.Value.Start).TotalMilliseconds) : "";
- wr.WriteLine("{0,-19}, {1,3}, {2,3}, {3,3}, {4,3}, {5,3}{6}", kv.Key, kv.Value.TransformedImplementationCount, kv.Value.LowPriorityImplementationCount, kv.Value.MediumPriorityImplementationCount, kv.Value.HighPriorityImplementationCount, kv.Value.SkippedImplementationCount, t);
- }
- }
- return wr.ToString();
- }
- }
-
-
- sealed class CachedVerificationResultInjector : StandardVisitor
- {
- readonly IEnumerable<Implementation> Implementations;
- readonly Program Program;
- // TODO(wuestholz): We should probably increase the threshold to something like 2 seconds.
- static readonly double TimeThreshold = -1.0d;
- Program programInCachedSnapshot;
- Implementation currentImplementation;
- int assumptionVariableCount;
- int temporaryVariableCount;
-
- public static readonly CachedVerificationResultInjectorStatistics Statistics = new CachedVerificationResultInjectorStatistics();
-
- int FreshAssumptionVariableName
- {
- get
- {
- return assumptionVariableCount++;
- }
- }
-
- int FreshTemporaryVariableName
- {
- get
- {
- return temporaryVariableCount++;
- }
- }
-
- CachedVerificationResultInjector(Program program, IEnumerable<Implementation> implementations)
- {
- Implementations = implementations;
- Program = program;
- }
-
- public Implementation Inject(Implementation implementation, Program programInCachedSnapshot)
- {
- Contract.Requires(implementation != null && programInCachedSnapshot != null);
-
- this.programInCachedSnapshot = programInCachedSnapshot;
- assumptionVariableCount = 0;
- temporaryVariableCount = 0;
- currentImplementation = implementation;
- var result = VisitImplementation(implementation);
- currentImplementation = null;
- this.programInCachedSnapshot = null;
- return result;
- }
-
- public static void Inject(Program program, IEnumerable<Implementation> implementations, string requestId, string programId, out long[] cachingActionCounts)
- {
- var eai = new CachedVerificationResultInjector(program, implementations);
-
- cachingActionCounts = new long[Enum.GetNames(typeof(VC.ConditionGeneration.CachingAction)).Length];
- var run = new CachedVerificationResultInjectorRun { Start = DateTime.UtcNow, ImplementationCount = implementations.Count(), CachingActionCounts = cachingActionCounts };
- foreach (var impl in implementations)
- {
- int priority;
- var vr = ExecutionEngine.Cache.Lookup(impl, out priority);
- if (vr != null && vr.ProgramId == programId)
- {
- if (priority == Priority.LOW)
- {
- run.LowPriorityImplementationCount++;
- if (TimeThreshold < vr.End.Subtract(vr.Start).TotalMilliseconds)
- {
- SetErrorAndAssertionChecksumsInCachedSnapshot(impl, vr);
- if (vr.ProgramId != null)
- {
- var p = ExecutionEngine.CachedProgram(vr.ProgramId);
- if (p != null)
- {
- eai.Inject(impl, p);
- run.TransformedImplementationCount++;
- }
- }
- }
- }
- else if (priority == Priority.MEDIUM)
- {
- run.MediumPriorityImplementationCount++;
- if (TimeThreshold < vr.End.Subtract(vr.Start).TotalMilliseconds)
- {
- SetErrorAndAssertionChecksumsInCachedSnapshot(impl, vr);
- if (vr.ProgramId != null)
- {
- var p = ExecutionEngine.CachedProgram(vr.ProgramId);
- if (p != null)
- {
- eai.Inject(impl, p);
- run.TransformedImplementationCount++;
- }
- }
- }
- }
- else if (priority == Priority.HIGH)
- {
- run.HighPriorityImplementationCount++;
- }
- else if (priority == Priority.SKIP)
- {
- run.SkippedImplementationCount++;
- }
- }
- }
- run.End = DateTime.UtcNow;
- Statistics.AddRun(requestId, run);
- }
-
- private static void SetErrorAndAssertionChecksumsInCachedSnapshot(Implementation implementation, VerificationResult result)
- {
- if (result.Outcome == ConditionGeneration.Outcome.Errors && result.Errors != null && result.Errors.Count < CommandLineOptions.Clo.ProverCCLimit)
- {
- implementation.SetErrorChecksumToCachedError(result.Errors.Select(cex => new Tuple<byte[], byte[], object>(cex.Checksum, cex.SugaredCmdChecksum, cex)));
- implementation.AssertionChecksumsInCachedSnapshot = result.AssertionChecksums;
- }
- else if (result.Outcome == ConditionGeneration.Outcome.Correct)
- {
- implementation.SetErrorChecksumToCachedError(new List<Tuple<byte[], byte[], object>>());
- implementation.AssertionChecksumsInCachedSnapshot = result.AssertionChecksums;
- }
- }
-
- public override Cmd VisitCallCmd(CallCmd node)
- {
- var result = base.VisitCallCmd(node);
-
- var oldProc = programInCachedSnapshot.FindProcedure(node.Proc.Name);
- if (oldProc != null
- && oldProc.DependencyChecksum != node.Proc.DependencyChecksum
- && node.AssignedAssumptionVariable == null)
- {
- var before = new List<Cmd>();
- var beforePrecondtionCheck = new List<Cmd>();
- var after = new List<Cmd>();
- var axioms = new List<Axiom>();
- Expr assumedExpr = new LiteralExpr(Token.NoToken, false);
- // TODO(wuestholz): Try out two alternatives: only do this for low priority implementations or not at all.
- var canUseSpecs = DependencyCollector.CanExpressOldSpecs(oldProc, Program);
- if (canUseSpecs)
- {
- var desugaring = node.Desugaring;
- Contract.Assert(desugaring != null);
- var precond = node.CheckedPrecondition(oldProc, Program, e => FunctionExtractor.Extract(e, Program, axioms));
- if (precond != null)
- {
- var assume = new AssumeCmd(node.tok, precond, new QKeyValue(Token.NoToken, "precondition_previous_snapshot", new List<object>(), null));
- beforePrecondtionCheck.Add(assume);
- }
-
- var unmods = node.UnmodifiedBefore(oldProc);
- var eqs = new List<Expr>();
- foreach (var unmod in unmods)
- {
- var oldUnmod = new LocalVariable(Token.NoToken,
- new TypedIdent(Token.NoToken, string.Format("{0}##old##{1}", unmod.Name, FreshTemporaryVariableName), unmod.Type));
- var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, oldUnmod));
- var rhs = new IdentifierExpr(Token.NoToken, unmod.Decl);
- before.Add(new AssignCmd(Token.NoToken, new List<AssignLhs> { lhs }, new List<Expr> { rhs }));
- var eq = LiteralExpr.Eq(new IdentifierExpr(Token.NoToken, oldUnmod), new IdentifierExpr(Token.NoToken, unmod.Decl));
- eq.Type = Type.Bool;
- eq.TypeParameters = SimpleTypeParamInstantiation.EMPTY;
- eqs.Add(eq);
- }
-
- var mods = node.ModifiedBefore(oldProc);
- var oldSubst = new Dictionary<Variable, Expr>();
- foreach (var mod in mods)
- {
- var oldMod = new LocalVariable(Token.NoToken,
- new TypedIdent(Token.NoToken, string.Format("{0}##old##{1}", mod.Name, FreshTemporaryVariableName), mod.Type));
- oldSubst[mod.Decl] = new IdentifierExpr(Token.NoToken, oldMod);
- var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, oldMod));
- var rhs = new IdentifierExpr(Token.NoToken, mod.Decl);
- before.Add(new AssignCmd(Token.NoToken, new List<AssignLhs> { lhs }, new List<Expr> { rhs }));
- }
-
- assumedExpr = node.Postcondition(oldProc, eqs, oldSubst, Program, e => FunctionExtractor.Extract(e, Program, axioms));
- }
-
- if (assumedExpr != null)
- {
- var lv = new LocalVariable(Token.NoToken,
- new TypedIdent(Token.NoToken, string.Format("a##post##{0}", FreshAssumptionVariableName), Type.Bool),
- new QKeyValue(Token.NoToken, "assumption", new List<object>(), null));
- node.AssignedAssumptionVariable = lv;
- currentImplementation.InjectAssumptionVariable(lv, !canUseSpecs);
- var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, lv));
- var rhs = LiteralExpr.And(new IdentifierExpr(Token.NoToken, lv), assumedExpr);
- var assumed = new AssignCmd(node.tok, new List<AssignLhs> { lhs }, new List<Expr> { rhs });
- after.Add(assumed);
- }
-
- node.ExtendDesugaring(before, beforePrecondtionCheck, after);
- if (CommandLineOptions.Clo.TraceCachingForTesting || CommandLineOptions.Clo.TraceCachingForBenchmarking)
- {
- using (var tokTxtWr = new TokenTextWriter("<console>", Console.Out, false, false))
- {
- var loc = node.tok != null && node.tok != Token.NoToken ? string.Format("{0}({1},{2})", node.tok.filename, node.tok.line, node.tok.col) : "<unknown location>";
- Console.Out.WriteLine("Processing call to procedure {0} in implementation {1} (at {2}):", node.Proc.Name, currentImplementation.Name, loc);
- foreach (var a in axioms)
- {
- Console.Out.Write(" >>> added axiom: ");
- a.Expr.Emit(tokTxtWr);
- Console.Out.WriteLine();
- }
- foreach (var b in before)
- {
- Console.Out.Write(" >>> added before: ");
- b.Emit(tokTxtWr, 0);
- }
- foreach (var b in beforePrecondtionCheck)
- {
- Console.Out.Write(" >>> added before precondition check: ");
- b.Emit(tokTxtWr, 0);
- }
- foreach (var a in after)
- {
- Console.Out.Write(" >>> added after: ");
- a.Emit(tokTxtWr, 0);
- }
- }
- }
- }
-
- return result;
- }
- }
-
-
- sealed class FunctionExtractor : StandardVisitor
- {
- readonly Dictionary<Variable, BoundVariable> Substitutions = new Dictionary<Variable, BoundVariable>();
-
- public override Expr VisitIdentifierExpr(IdentifierExpr node)
- {
- if (node.Decl == null || !(node.Decl is LocalVariable || node.Decl is Formal || node.Decl is GlobalVariable))
- {
- return node;
- }
- else
- {
- BoundVariable boundVar;
- if (!Substitutions.TryGetValue(node.Decl, out boundVar))
- {
- boundVar = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, node.Name, node.Type));
- Substitutions[node.Decl] = boundVar;
- }
- return new IdentifierExpr(node.tok, boundVar);
- }
- }
-
- public static Expr Extract(Expr expr, Program program, List<Axiom> axioms)
- {
- Contract.Requires(expr != null && program != null && !program.TopLevelDeclarationsAreFrozen && axioms != null);
-
- if (expr is LiteralExpr)
- {
- return expr;
- }
-
- var extractor = new FunctionExtractor();
-
- var body = extractor.VisitExpr(expr);
-
- var name = program.FreshExtractedFunctionName();
- var originalVars = extractor.Substitutions.Keys.ToList();
- var formalInArgs = originalVars.Select(v => new Formal(Token.NoToken, new TypedIdent(Token.NoToken, extractor.Substitutions[v].Name, extractor.Substitutions[v].TypedIdent.Type), true)).ToList<Variable>();
- var formalOutArg = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, name + "$result$", expr.Type), false);
- var func = new Function(Token.NoToken, name, formalInArgs, formalOutArg);
- func.AddAttribute("never_pattern");
-
- var boundVars = originalVars.Select(k => extractor.Substitutions[k]);
- var axiomCall = new NAryExpr(Token.NoToken, new FunctionCall(func), boundVars.Select(b => new IdentifierExpr(Token.NoToken, b)).ToList<Expr>());
- axiomCall.Type = expr.Type;
- axiomCall.TypeParameters = SimpleTypeParamInstantiation.EMPTY;
- var eq = LiteralExpr.Eq(axiomCall, body);
- eq.Type = body.Type;
- eq.TypeParameters = SimpleTypeParamInstantiation.EMPTY;
- if (0 < formalInArgs.Count)
- {
- var forallExpr = new ForallExpr(Token.NoToken, boundVars.ToList<Variable>(), new Trigger(Token.NoToken, true, new List<Expr> { axiomCall }), eq);
- body = forallExpr;
- forallExpr.Attributes = new QKeyValue(Token.NoToken, "weight", new List<object> { new LiteralExpr(Token.NoToken, Basetypes.BigNum.FromInt(30)) }, null);
- body.Type = Type.Bool;
- }
- else
- {
- body = eq;
- }
-
- var axiom = new Axiom(Token.NoToken, body);
- func.DefinitionAxiom = axiom;
- program.AddTopLevelDeclaration(func);
- program.AddTopLevelDeclaration(axiom);
- axioms.Add(axiom);
-
- var call = new NAryExpr(Token.NoToken, new FunctionCall(func), originalVars.Select(v => new IdentifierExpr(Token.NoToken, v)).ToList<Expr>());
- call.Type = expr.Type;
- call.TypeParameters = SimpleTypeParamInstantiation.EMPTY;
- return call;
- }
- }
-
-
- sealed class OtherDefinitionAxiomsCollector : ReadOnlyVisitor
- {
- Axiom currentAxiom;
- Trigger currentTrigger;
-
- public static void Collect(IEnumerable<Axiom> axioms)
- {
- var start = DateTime.UtcNow;
-
- var v = new OtherDefinitionAxiomsCollector();
- foreach (var a in axioms)
- {
- v.currentAxiom = a;
- v.VisitExpr(a.Expr);
- v.currentAxiom = null;
- }
-
- var end = DateTime.UtcNow;
- if (CommandLineOptions.Clo.TraceCachingForDebugging)
- {
- Console.Out.WriteLine("Collected other definition axioms within {0:F0} ms.", end.Subtract(start).TotalMilliseconds);
- }
- }
-
- public override QuantifierExpr VisitQuantifierExpr(QuantifierExpr node)
- {
- currentTrigger = node.Triggers;
- while (currentTrigger != null)
- {
- foreach (var e in currentTrigger.Tr)
- {
- VisitExpr(e);
- }
- currentTrigger = currentTrigger.Next;
- }
- return base.VisitQuantifierExpr(node);
- }
-
- public override Expr VisitNAryExpr(NAryExpr node)
- {
- if (currentTrigger != null)
- {
- // We found a function call within a trigger of a quantifier expression.
- var funCall = node.Fun as FunctionCall;
- if (funCall != null && funCall.Func != null && funCall.Func.Checksum != null && funCall.Func.Checksum != "stable")
- {
- funCall.Func.AddOtherDefinitionAxiom(currentAxiom);
- }
- }
- return base.VisitNAryExpr(node);
- }
- }
-
-
- sealed class DependencyCollector : ReadOnlyVisitor
- {
- private DeclWithFormals currentDeclaration;
- private Axiom currentAxiom;
-
- public static void Collect(Program program)
- {
- var start = DateTime.UtcNow;
-
- var dc = new DependencyCollector();
- dc.VisitProgram(program);
-
- var end = DateTime.UtcNow;
- if (CommandLineOptions.Clo.TraceCachingForDebugging)
- {
- Console.Out.WriteLine("Collected dependencies within {0:F0} ms.", end.Subtract(start).TotalMilliseconds);
- }
- }
-
- public static bool CanExpressOldSpecs(Procedure oldProc, Program newProg)
- {
- Contract.Requires(oldProc != null && newProg != null);
-
- var funcs = newProg.Functions;
- var globals = newProg.GlobalVariables;
- return oldProc.DependenciesCollected
- && (oldProc.FunctionDependencies == null || oldProc.FunctionDependencies.All(dep => funcs.Any(f => f.Name == dep.Name && f.DependencyChecksum == dep.DependencyChecksum)))
- && oldProc.Modifies.All(m => globals.Any(g => g.Name == m.Name));
- }
-
- public override Procedure VisitProcedure(Procedure node)
- {
- currentDeclaration = node;
-
- foreach (var param in node.InParams)
- {
- if (param.TypedIdent != null && param.TypedIdent.WhereExpr != null)
- {
- VisitExpr(param.TypedIdent.WhereExpr);
- }
- }
-
- var result = base.VisitProcedure(node);
- node.DependenciesCollected = true;
- currentDeclaration = null;
- return result;
- }
-
- public override Implementation VisitImplementation(Implementation node)
- {
- currentDeclaration = node;
-
- foreach (var param in node.InParams)
- {
- if (param.TypedIdent != null && param.TypedIdent.WhereExpr != null)
- {
- VisitExpr(param.TypedIdent.WhereExpr);
- }
- }
-
- if (node.Proc != null)
- {
- node.AddProcedureDependency(node.Proc);
- }
-
- var result = base.VisitImplementation(node);
- node.DependenciesCollected = true;
- currentDeclaration = null;
- return result;
- }
-
- public override Axiom VisitAxiom(Axiom node)
- {
- if (node.DependenciesCollected)
- {
- if (currentDeclaration != null && node.FunctionDependencies != null)
- {
- foreach (var f in node.FunctionDependencies)
- {
- currentDeclaration.AddFunctionDependency(f);
- }
- }
- return node;
- }
- currentAxiom = node;
- var result = base.VisitAxiom(node);
- node.DependenciesCollected = true;
- currentAxiom = null;
- return result;
- }
-
- public override Function VisitFunction(Function node)
- {
- currentDeclaration = node;
-
- if (node.DefinitionAxiom != null)
- {
- VisitAxiom(node.DefinitionAxiom);
- }
- if (node.OtherDefinitionAxioms != null)
- {
- foreach (var a in node.OtherDefinitionAxioms)
- {
- if (a != node.DefinitionAxiom)
- {
- VisitAxiom(a);
- }
- }
- }
-
- var result = base.VisitFunction(node);
- node.DependenciesCollected = true;
- currentDeclaration = null;
- return result;
- }
-
- public override Cmd VisitCallCmd(CallCmd node)
- {
- if (currentDeclaration != null)
- {
- currentDeclaration.AddProcedureDependency(node.Proc);
- }
-
- return base.VisitCallCmd(node);
- }
-
- public override Expr VisitNAryExpr(NAryExpr node)
- {
- var funCall = node.Fun as FunctionCall;
- if (funCall != null)
- {
- if (currentDeclaration != null)
- {
- currentDeclaration.AddFunctionDependency(funCall.Func);
- }
- if (currentAxiom != null)
- {
- currentAxiom.AddFunctionDependency(funCall.Func);
- }
- }
-
- return base.VisitNAryExpr(node);
- }
- }
-
-
- static internal class Priority
- {
- public static readonly int LOW = 1; // the same snapshot has been verified before, but a callee has changed
- public static readonly int MEDIUM = 2; // old snapshot has been verified before
- public static readonly int HIGH = 3; // has been never verified before
- public static readonly int SKIP = int.MaxValue; // highest priority to get them done as soon as possible
- }
-
-
- public sealed class VerificationResultCache
- {
- private readonly MemoryCache Cache = new MemoryCache("VerificationResultCache");
- private readonly CacheItemPolicy Policy = new CacheItemPolicy { SlidingExpiration = new TimeSpan(0, 10, 0), Priority = CacheItemPriority.Default };
-
-
- public void Insert(Implementation impl, VerificationResult result)
- {
- Contract.Requires(impl != null);
- Contract.Requires(result != null);
-
- Cache.Set(impl.Id, result, Policy);
- }
-
-
- public VerificationResult Lookup(Implementation impl, out int priority)
- {
- Contract.Requires(impl != null);
-
- var result = Cache.Get(impl.Id) as VerificationResult;
- if (result == null)
- {
- priority = Priority.HIGH;
- }
- else if (result.Checksum != impl.Checksum)
- {
- priority = Priority.MEDIUM;
- }
- else if (impl.DependencyChecksum == null || result.DependeciesChecksum != impl.DependencyChecksum)
- {
- priority = Priority.LOW;
- }
- else
- {
- priority = Priority.SKIP;
- }
- return result;
- }
-
-
- public void Clear()
- {
- Cache.Trim(100);
- }
-
-
- public void RemoveMatchingKeys(Regex keyRegexp)
- {
- Contract.Requires(keyRegexp != null);
-
- foreach (var kv in Cache)
- {
- if (keyRegexp.IsMatch(kv.Key))
- {
- Cache.Remove(kv.Key);
- }
- }
- }
-
-
- public int VerificationPriority(Implementation impl)
- {
- Contract.Requires(impl != null);
-
- int priority;
- Lookup(impl, out priority);
- return priority;
- }
- }
-
-}
+using System; +using System.Collections.Concurrent; +using System.Collections.Generic; +using System.Diagnostics.Contracts; +using System.IO; +using System.Linq; +using System.Runtime.Caching; +using System.Text; +using System.Text.RegularExpressions; +using VC; + +namespace Microsoft.Boogie +{ + + struct CachedVerificationResultInjectorRun + { + public DateTime Start { get; internal set; } + public DateTime End { get; internal set; } + public int TransformedImplementationCount { get; internal set; } + public int ImplementationCount { get; internal set; } + public int SkippedImplementationCount { get; set; } + public int LowPriorityImplementationCount { get; set; } + public int MediumPriorityImplementationCount { get; set; } + public int HighPriorityImplementationCount { get; set; } + public long[] CachingActionCounts { get; set; } + } + + + sealed class CachedVerificationResultInjectorStatistics + { + ConcurrentDictionary<string, CachedVerificationResultInjectorRun> runs = new ConcurrentDictionary<string, CachedVerificationResultInjectorRun>(); + + public bool AddRun(string requestId, CachedVerificationResultInjectorRun run) + { + return runs.TryAdd(requestId, run); + } + + public string Output(bool printTime = false) + { + var wr = new StringWriter(); + if (runs.Any()) + { + wr.WriteLine("Cached verification result injector statistics as CSV:"); + wr.WriteLine("Request ID, Transformed, Low, Medium, High, Skipped{0}", printTime ? ", Time (ms)" : ""); + foreach (var kv in runs.OrderBy(kv => ExecutionEngine.AutoRequestId(kv.Key))) + { + var t = printTime ? string.Format(", {0,8:F0}", kv.Value.End.Subtract(kv.Value.Start).TotalMilliseconds) : ""; + wr.WriteLine("{0,-19}, {1,3}, {2,3}, {3,3}, {4,3}, {5,3}{6}", kv.Key, kv.Value.TransformedImplementationCount, kv.Value.LowPriorityImplementationCount, kv.Value.MediumPriorityImplementationCount, kv.Value.HighPriorityImplementationCount, kv.Value.SkippedImplementationCount, t); + } + } + return wr.ToString(); + } + } + + + sealed class CachedVerificationResultInjector : StandardVisitor + { + readonly IEnumerable<Implementation> Implementations; + readonly Program Program; + // TODO(wuestholz): We should probably increase the threshold to something like 2 seconds. + static readonly double TimeThreshold = -1.0d; + Program programInCachedSnapshot; + Implementation currentImplementation; + int assumptionVariableCount; + int temporaryVariableCount; + + public static readonly CachedVerificationResultInjectorStatistics Statistics = new CachedVerificationResultInjectorStatistics(); + + int FreshAssumptionVariableName + { + get + { + return assumptionVariableCount++; + } + } + + int FreshTemporaryVariableName + { + get + { + return temporaryVariableCount++; + } + } + + CachedVerificationResultInjector(Program program, IEnumerable<Implementation> implementations) + { + Implementations = implementations; + Program = program; + } + + public Implementation Inject(Implementation implementation, Program programInCachedSnapshot) + { + Contract.Requires(implementation != null && programInCachedSnapshot != null); + + this.programInCachedSnapshot = programInCachedSnapshot; + assumptionVariableCount = 0; + temporaryVariableCount = 0; + currentImplementation = implementation; + + #region Introduce explict assumption about the precondition. + + var oldProc = programInCachedSnapshot.FindProcedure(currentImplementation.Proc.Name); + if (oldProc != null + && oldProc.DependencyChecksum != currentImplementation.Proc.DependencyChecksum + && currentImplementation.ExplicitAssumptionAboutCachedPrecondition == null) + { + var axioms = new List<Axiom>(); + var after = new List<Cmd>(); + Expr assumedExpr = new LiteralExpr(Token.NoToken, false); + var canUseSpecs = DependencyCollector.CanExpressOldSpecs(oldProc, Program, true); + if (canUseSpecs && oldProc.SignatureEquals(currentImplementation.Proc)) + { + var always = Substituter.SubstitutionFromHashtable(currentImplementation.GetImplFormalMap(), true, currentImplementation.Proc); + var forOld = Substituter.SubstitutionFromHashtable(new Dictionary<Variable, Expr>()); + var clauses = oldProc.Requires.Select(r => Substituter.FunctionCallReresolvingApply(always, forOld, r.Condition, Program)); + var conj = Expr.And(clauses, true); + assumedExpr = conj != null ? FunctionExtractor.Extract(conj, Program, axioms) : new LiteralExpr(Token.NoToken, true); + } + + if (assumedExpr != null) + { + var lv = new LocalVariable(Token.NoToken, + new TypedIdent(Token.NoToken, string.Format("a##cached##{0}", FreshAssumptionVariableName), Type.Bool), + new QKeyValue(Token.NoToken, "assumption", new List<object>(), null)); + currentImplementation.InjectAssumptionVariable(lv, !canUseSpecs); + var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, lv)); + var rhs = LiteralExpr.And(new IdentifierExpr(Token.NoToken, lv), assumedExpr); + var assumed = new AssignCmd(currentImplementation.tok, new List<AssignLhs> { lhs }, new List<Expr> { rhs }); + assumed.IrrelevantForChecksumComputation = true; + currentImplementation.ExplicitAssumptionAboutCachedPrecondition = assumed; + after.Add(assumed); + } + + if (CommandLineOptions.Clo.TraceCachingForTesting || CommandLineOptions.Clo.TraceCachingForBenchmarking) + { + using (var tokTxtWr = new TokenTextWriter("<console>", Console.Out, false, false)) + { + var loc = currentImplementation.tok != null && currentImplementation.tok != Token.NoToken ? string.Format("{0}({1},{2})", currentImplementation.tok.filename, currentImplementation.tok.line, currentImplementation.tok.col) : "<unknown location>"; + Console.Out.WriteLine("Processing implementation {0} (at {1}):", currentImplementation.Name, loc); + foreach (var a in axioms) + { + Console.Out.Write(" >>> added axiom: "); + a.Expr.Emit(tokTxtWr); + Console.Out.WriteLine(); + } + foreach (var b in after) + { + Console.Out.Write(" >>> added after assuming the current precondition: "); + b.Emit(tokTxtWr, 0); + } + } + } + } + + #endregion + + var result = VisitImplementation(currentImplementation); + currentImplementation = null; + this.programInCachedSnapshot = null; + return result; + } + + public static void Inject(Program program, IEnumerable<Implementation> implementations, string requestId, string programId, out long[] cachingActionCounts) + { + var eai = new CachedVerificationResultInjector(program, implementations); + + cachingActionCounts = new long[Enum.GetNames(typeof(VC.ConditionGeneration.CachingAction)).Length]; + var run = new CachedVerificationResultInjectorRun { Start = DateTime.UtcNow, ImplementationCount = implementations.Count(), CachingActionCounts = cachingActionCounts }; + foreach (var impl in implementations) + { + int priority; + var vr = ExecutionEngine.Cache.Lookup(impl, out priority); + if (vr != null && vr.ProgramId == programId) + { + if (priority == Priority.LOW) { + run.LowPriorityImplementationCount++; + } else if (priority == Priority.MEDIUM) { + run.MediumPriorityImplementationCount++; + } else if (priority == Priority.HIGH) { + run.HighPriorityImplementationCount++; + } else if (priority == Priority.SKIP) { + run.SkippedImplementationCount++; + } + + if (priority == Priority.LOW || priority == Priority.MEDIUM || 3 <= CommandLineOptions.Clo.VerifySnapshots) { + if (TimeThreshold < vr.End.Subtract(vr.Start).TotalMilliseconds) { + SetErrorAndAssertionChecksumsInCachedSnapshot(impl, vr); + if (vr.ProgramId != null) { + var p = ExecutionEngine.CachedProgram(vr.ProgramId); + if (p != null) { + eai.Inject(impl, p); + run.TransformedImplementationCount++; + } + } + } + } + } + } + run.End = DateTime.UtcNow; + Statistics.AddRun(requestId, run); + } + + private static void SetErrorAndAssertionChecksumsInCachedSnapshot(Implementation implementation, VerificationResult result) + { + if (result.Outcome == ConditionGeneration.Outcome.Errors && result.Errors != null && result.Errors.Count < CommandLineOptions.Clo.ProverCCLimit) + { + implementation.SetErrorChecksumToCachedError(result.Errors.Select(cex => new Tuple<byte[], byte[], object>(cex.Checksum, cex.SugaredCmdChecksum, cex))); + implementation.AssertionChecksumsInCachedSnapshot = result.AssertionChecksums; + } + else if (result.Outcome == ConditionGeneration.Outcome.Correct) + { + implementation.SetErrorChecksumToCachedError(new List<Tuple<byte[], byte[], object>>()); + implementation.AssertionChecksumsInCachedSnapshot = result.AssertionChecksums; + } + } + + public override Cmd VisitCallCmd(CallCmd node) + { + var result = base.VisitCallCmd(node); + + var oldProc = programInCachedSnapshot.FindProcedure(node.Proc.Name); + if (oldProc != null + && oldProc.DependencyChecksum != node.Proc.DependencyChecksum + && node.AssignedAssumptionVariable == null) + { + var before = new List<Cmd>(); + var beforePrecondtionCheck = new List<Cmd>(); + var after = new List<Cmd>(); + var axioms = new List<Axiom>(); + Expr assumedExpr = new LiteralExpr(Token.NoToken, false); + // TODO(wuestholz): Try out two alternatives: only do this for low priority implementations or not at all. + var canUseSpecs = DependencyCollector.CanExpressOldSpecs(oldProc, Program); + if (canUseSpecs && oldProc.SignatureEquals(node.Proc)) + { + var desugaring = node.Desugaring; + Contract.Assert(desugaring != null); + var precond = node.CheckedPrecondition(oldProc, Program, e => FunctionExtractor.Extract(e, Program, axioms)); + if (precond != null) + { + var assume = new AssumeCmd(node.tok, precond, new QKeyValue(Token.NoToken, "precondition_previous_snapshot", new List<object>(), null)); + assume.IrrelevantForChecksumComputation = true; + beforePrecondtionCheck.Add(assume); + } + + var unmods = node.UnmodifiedBefore(oldProc); + var eqs = new List<Expr>(); + foreach (var unmod in unmods) + { + var oldUnmod = new LocalVariable(Token.NoToken, + new TypedIdent(Token.NoToken, string.Format("{0}##old##{1}", unmod.Name, FreshTemporaryVariableName), unmod.Type)); + var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, oldUnmod)); + var rhs = new IdentifierExpr(Token.NoToken, unmod.Decl); + var cmd = new AssignCmd(Token.NoToken, new List<AssignLhs> { lhs }, new List<Expr> { rhs }); + cmd.IrrelevantForChecksumComputation = true; + before.Add(cmd); + var eq = LiteralExpr.Eq(new IdentifierExpr(Token.NoToken, oldUnmod), new IdentifierExpr(Token.NoToken, unmod.Decl)); + eq.Type = Type.Bool; + eq.TypeParameters = SimpleTypeParamInstantiation.EMPTY; + eqs.Add(eq); + } + + var mods = node.ModifiedBefore(oldProc); + var oldSubst = new Dictionary<Variable, Expr>(); + foreach (var mod in mods) + { + var oldMod = new LocalVariable(Token.NoToken, + new TypedIdent(Token.NoToken, string.Format("{0}##old##{1}", mod.Name, FreshTemporaryVariableName), mod.Type)); + oldSubst[mod.Decl] = new IdentifierExpr(Token.NoToken, oldMod); + var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, oldMod)); + var rhs = new IdentifierExpr(Token.NoToken, mod.Decl); + var cmd = new AssignCmd(Token.NoToken, new List<AssignLhs> { lhs }, new List<Expr> { rhs }); + cmd.IrrelevantForChecksumComputation = true; + before.Add(cmd); + } + + assumedExpr = node.Postcondition(oldProc, eqs, oldSubst, Program, e => FunctionExtractor.Extract(e, Program, axioms)); + if (assumedExpr == null) + { + assumedExpr = new LiteralExpr(Token.NoToken, true); + } + } + + if (assumedExpr != null) + { + var lv = new LocalVariable(Token.NoToken, + new TypedIdent(Token.NoToken, string.Format("a##cached##{0}", FreshAssumptionVariableName), Type.Bool), + new QKeyValue(Token.NoToken, "assumption", new List<object>(), null)); + node.AssignedAssumptionVariable = lv; + currentImplementation.InjectAssumptionVariable(lv, !canUseSpecs); + var lhs = new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, lv)); + var rhs = LiteralExpr.And(new IdentifierExpr(Token.NoToken, lv), assumedExpr); + var assumed = new AssignCmd(node.tok, new List<AssignLhs> { lhs }, new List<Expr> { rhs }); + assumed.IrrelevantForChecksumComputation = true; + after.Add(assumed); + } + + node.ExtendDesugaring(before, beforePrecondtionCheck, after); + if (CommandLineOptions.Clo.TraceCachingForTesting || CommandLineOptions.Clo.TraceCachingForBenchmarking) + { + using (var tokTxtWr = new TokenTextWriter("<console>", Console.Out, false, false)) + { + var loc = node.tok != null && node.tok != Token.NoToken ? string.Format("{0}({1},{2})", node.tok.filename, node.tok.line, node.tok.col) : "<unknown location>"; + Console.Out.WriteLine("Processing call to procedure {0} in implementation {1} (at {2}):", node.Proc.Name, currentImplementation.Name, loc); + foreach (var a in axioms) + { + Console.Out.Write(" >>> added axiom: "); + a.Expr.Emit(tokTxtWr); + Console.Out.WriteLine(); + } + foreach (var b in before) + { + Console.Out.Write(" >>> added before: "); + b.Emit(tokTxtWr, 0); + } + foreach (var b in beforePrecondtionCheck) + { + Console.Out.Write(" >>> added before precondition check: "); + b.Emit(tokTxtWr, 0); + } + foreach (var a in after) + { + Console.Out.Write(" >>> added after: "); + a.Emit(tokTxtWr, 0); + } + } + } + } + + return result; + } + } + + + sealed class FunctionExtractor : StandardVisitor + { + readonly Dictionary<Variable, BoundVariable> Substitutions = new Dictionary<Variable, BoundVariable>(); + + public override Expr VisitIdentifierExpr(IdentifierExpr node) + { + if (node.Decl == null || !(node.Decl is LocalVariable || node.Decl is Formal || node.Decl is GlobalVariable)) + { + return node; + } + else + { + BoundVariable boundVar; + if (!Substitutions.TryGetValue(node.Decl, out boundVar)) + { + boundVar = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, node.Name, node.Type)); + Substitutions[node.Decl] = boundVar; + } + return new IdentifierExpr(node.tok, boundVar); + } + } + + public static Expr Extract(Expr expr, Program program, List<Axiom> axioms) + { + Contract.Requires(expr != null && program != null && !program.TopLevelDeclarationsAreFrozen && axioms != null); + + if (expr is LiteralExpr) + { + return expr; + } + + var extractor = new FunctionExtractor(); + + var body = extractor.VisitExpr(expr); + + var name = program.FreshExtractedFunctionName(); + var originalVars = extractor.Substitutions.Keys.ToList(); + var formalInArgs = originalVars.Select(v => new Formal(Token.NoToken, new TypedIdent(Token.NoToken, extractor.Substitutions[v].Name, extractor.Substitutions[v].TypedIdent.Type), true)).ToList<Variable>(); + var formalOutArg = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, name + "$result$", expr.Type), false); + var func = new Function(Token.NoToken, name, formalInArgs, formalOutArg); + func.AddAttribute("never_pattern"); + + var boundVars = originalVars.Select(k => extractor.Substitutions[k]); + var axiomCall = new NAryExpr(Token.NoToken, new FunctionCall(func), boundVars.Select(b => new IdentifierExpr(Token.NoToken, b)).ToList<Expr>()); + axiomCall.Type = expr.Type; + axiomCall.TypeParameters = SimpleTypeParamInstantiation.EMPTY; + var eq = LiteralExpr.Eq(axiomCall, body); + eq.Type = body.Type; + eq.TypeParameters = SimpleTypeParamInstantiation.EMPTY; + if (0 < formalInArgs.Count) + { + var forallExpr = new ForallExpr(Token.NoToken, boundVars.ToList<Variable>(), new Trigger(Token.NoToken, true, new List<Expr> { axiomCall }), eq); + body = forallExpr; + forallExpr.Attributes = new QKeyValue(Token.NoToken, "weight", new List<object> { new LiteralExpr(Token.NoToken, Basetypes.BigNum.FromInt(30)) }, null); + body.Type = Type.Bool; + } + else + { + body = eq; + } + + var axiom = new Axiom(Token.NoToken, body); + func.DefinitionAxiom = axiom; + program.AddTopLevelDeclaration(func); + program.AddTopLevelDeclaration(axiom); + axioms.Add(axiom); + + var call = new NAryExpr(Token.NoToken, new FunctionCall(func), originalVars.Select(v => new IdentifierExpr(Token.NoToken, v)).ToList<Expr>()); + call.Type = expr.Type; + call.TypeParameters = SimpleTypeParamInstantiation.EMPTY; + return call; + } + } + + + sealed class OtherDefinitionAxiomsCollector : ReadOnlyVisitor + { + Axiom currentAxiom; + Trigger currentTrigger; + + public static void Collect(IEnumerable<Axiom> axioms) + { + var start = DateTime.UtcNow; + + var v = new OtherDefinitionAxiomsCollector(); + foreach (var a in axioms) + { + v.currentAxiom = a; + v.VisitExpr(a.Expr); + v.currentAxiom = null; + } + + var end = DateTime.UtcNow; + if (CommandLineOptions.Clo.TraceCachingForDebugging) + { + Console.Out.WriteLine("Collected other definition axioms within {0:F0} ms.", end.Subtract(start).TotalMilliseconds); + } + } + + public override QuantifierExpr VisitQuantifierExpr(QuantifierExpr node) + { + currentTrigger = node.Triggers; + while (currentTrigger != null) + { + foreach (var e in currentTrigger.Tr) + { + VisitExpr(e); + } + currentTrigger = currentTrigger.Next; + } + return base.VisitQuantifierExpr(node); + } + + public override Expr VisitNAryExpr(NAryExpr node) + { + if (currentTrigger != null) + { + // We found a function call within a trigger of a quantifier expression. + var funCall = node.Fun as FunctionCall; + if (funCall != null && funCall.Func != null && funCall.Func.Checksum != null && funCall.Func.Checksum != "stable") + { + funCall.Func.AddOtherDefinitionAxiom(currentAxiom); + } + } + return base.VisitNAryExpr(node); + } + } + + + sealed class DependencyCollector : ReadOnlyVisitor + { + private DeclWithFormals currentDeclaration; + private Axiom currentAxiom; + + public static void Collect(Program program) + { + var start = DateTime.UtcNow; + + var dc = new DependencyCollector(); + dc.VisitProgram(program); + + var end = DateTime.UtcNow; + if (CommandLineOptions.Clo.TraceCachingForDebugging) + { + Console.Out.WriteLine("Collected dependencies within {0:F0} ms.", end.Subtract(start).TotalMilliseconds); + } + } + + public static bool CanExpressOldSpecs(Procedure oldProc, Program newProg, bool ignoreModifiesClauses = false) + { + Contract.Requires(oldProc != null && newProg != null); + + var funcs = newProg.Functions; + var globals = newProg.GlobalVariables; + return oldProc.DependenciesCollected + && (oldProc.FunctionDependencies == null || oldProc.FunctionDependencies.All(dep => funcs.Any(f => f.Name == dep.Name && f.DependencyChecksum == dep.DependencyChecksum))) + && (ignoreModifiesClauses || oldProc.Modifies.All(m => globals.Any(g => g.Name == m.Name))); + } + + public override Procedure VisitProcedure(Procedure node) + { + currentDeclaration = node; + + foreach (var param in node.InParams) + { + if (param.TypedIdent != null && param.TypedIdent.WhereExpr != null) + { + VisitExpr(param.TypedIdent.WhereExpr); + } + } + + var result = base.VisitProcedure(node); + node.DependenciesCollected = true; + currentDeclaration = null; + return result; + } + + public override Implementation VisitImplementation(Implementation node) + { + currentDeclaration = node; + + foreach (var param in node.InParams) + { + if (param.TypedIdent != null && param.TypedIdent.WhereExpr != null) + { + VisitExpr(param.TypedIdent.WhereExpr); + } + } + + if (node.Proc != null) + { + node.AddProcedureDependency(node.Proc); + } + + var result = base.VisitImplementation(node); + node.DependenciesCollected = true; + currentDeclaration = null; + return result; + } + + public override Axiom VisitAxiom(Axiom node) + { + if (node.DependenciesCollected) + { + if (currentDeclaration != null && node.FunctionDependencies != null) + { + foreach (var f in node.FunctionDependencies) + { + currentDeclaration.AddFunctionDependency(f); + } + } + return node; + } + currentAxiom = node; + var result = base.VisitAxiom(node); + node.DependenciesCollected = true; + currentAxiom = null; + return result; + } + + public override Function VisitFunction(Function node) + { + currentDeclaration = node; + + if (node.DefinitionAxiom != null) + { + VisitAxiom(node.DefinitionAxiom); + } + if (node.OtherDefinitionAxioms != null) + { + foreach (var a in node.OtherDefinitionAxioms) + { + if (a != node.DefinitionAxiom) + { + VisitAxiom(a); + } + } + } + + var result = base.VisitFunction(node); + node.DependenciesCollected = true; + currentDeclaration = null; + return result; + } + + public override Cmd VisitCallCmd(CallCmd node) + { + if (currentDeclaration != null) + { + currentDeclaration.AddProcedureDependency(node.Proc); + } + + return base.VisitCallCmd(node); + } + + public override Expr VisitNAryExpr(NAryExpr node) + { + var funCall = node.Fun as FunctionCall; + if (funCall != null) + { + if (currentDeclaration != null) + { + currentDeclaration.AddFunctionDependency(funCall.Func); + } + if (currentAxiom != null) + { + currentAxiom.AddFunctionDependency(funCall.Func); + } + } + + return base.VisitNAryExpr(node); + } + } + + + static internal class Priority + { + public static readonly int LOW = 1; // the same snapshot has been verified before, but a callee has changed + public static readonly int MEDIUM = 2; // old snapshot has been verified before + public static readonly int HIGH = 3; // has been never verified before + public static readonly int SKIP = int.MaxValue; // highest priority to get them done as soon as possible + } + + + public sealed class VerificationResultCache + { + private readonly MemoryCache Cache = new MemoryCache("VerificationResultCache"); + private readonly CacheItemPolicy Policy = new CacheItemPolicy { SlidingExpiration = new TimeSpan(0, 10, 0), Priority = CacheItemPriority.Default }; + + + public void Insert(Implementation impl, VerificationResult result) + { + Contract.Requires(impl != null); + Contract.Requires(result != null); + + Cache.Set(impl.Id, result, Policy); + } + + + public VerificationResult Lookup(Implementation impl, out int priority) + { + Contract.Requires(impl != null); + + var result = Cache.Get(impl.Id) as VerificationResult; + if (result == null) + { + priority = Priority.HIGH; + } + else if (result.Checksum != impl.Checksum) + { + priority = Priority.MEDIUM; + } + else if (impl.DependencyChecksum == null || result.DependeciesChecksum != impl.DependencyChecksum) + { + priority = Priority.LOW; + } + else if (result.Outcome == ConditionGeneration.Outcome.TimedOut && CommandLineOptions.Clo.RunDiagnosticsOnTimeout) + { + priority = Priority.MEDIUM; + } + else + { + priority = Priority.SKIP; + } + return result; + } + + + public void Clear() + { + Cache.Trim(100); + } + + + public void RemoveMatchingKeys(Regex keyRegexp) + { + Contract.Requires(keyRegexp != null); + + foreach (var kv in Cache) + { + if (keyRegexp.IsMatch(kv.Key)) + { + Cache.Remove(kv.Key); + } + } + } + + + public int VerificationPriority(Implementation impl) + { + Contract.Requires(impl != null); + + int priority; + Lookup(impl, out priority); + return priority; + } + } + +} |