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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.IO;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using Microsoft.Boogie;
using Microsoft.Boogie.VCExprAST;
using Microsoft.Boogie.Clustering;
using Microsoft.Boogie.TypeErasure;
using Microsoft.Boogie.Simplify;
namespace Microsoft.Boogie.TPTP
{
public class TPTPProverOptions : ProverOptions
{
public string Output = "boogie-vc-@PROC@.tptp";
public bool UsePredicates = false;
protected override bool Parse(string opt)
{
return
ParseString(opt, "OUTPUT", ref Output) ||
ParseBool(opt, "USE_PREDICATES", ref UsePredicates) ||
base.Parse(opt);
}
public override string Help
{
get
{
return
@"
TPTP-specific options:
~~~~~~~~~~~~~~~~~~~~~~
OUTPUT=<string> Store VC in named file. Defaults to boogie-vc-@PROC@.tptp.
USE_PREDICATES=<bool> Try to use SMT predicates for functions returning bool.
" + base.Help;
// DIST requires non-public binaries
}
}
}
public class TPTPProcessTheoremProver : LogProverInterface
{
private readonly DeclFreeProverContext ctx;
private readonly VCExpressionGenerator Gen;
[ContractInvariantMethod]
void ObjectInvariant()
{
Contract.Invariant(ctx != null);
Contract.Invariant(AxBuilder != null);
Contract.Invariant(Namer != null);
Contract.Invariant(DeclCollector != null);
Contract.Invariant(cce.NonNullElements(Axioms));
Contract.Invariant(cce.NonNullElements(TypeDecls));
Contract.Invariant(_backgroundPredicates != null);
}
[NotDelayed]
public TPTPProcessTheoremProver(ProverOptions options, VCExpressionGenerator gen,
DeclFreeProverContext ctx)
: base(options, "", "", "", "", gen)
{
Contract.Requires(options != null);
Contract.Requires(gen != null);
Contract.Requires(ctx != null);
// No bg predicate at the moment
// InitializeGlobalInformation("UnivBackPred.tptp");
this.ctx = ctx;
this.Gen = gen;
TypeAxiomBuilder axBuilder;
switch (CommandLineOptions.Clo.TypeEncodingMethod) {
case CommandLineOptions.TypeEncoding.Arguments:
axBuilder = new TypeAxiomBuilderArguments(gen);
axBuilder.Setup();
break;
case CommandLineOptions.TypeEncoding.Monomorphic:
axBuilder = new TypeAxiomBuilderPremisses(gen);
break;
default:
axBuilder = new TypeAxiomBuilderPremisses(gen);
axBuilder.Setup();
break;
}
AxBuilder = axBuilder;
UniqueNamer namer = new UniqueNamer();
Namer = namer;
Namer.Spacer = "__";
this.DeclCollector = new TypeDeclCollector(namer);
}
public override ProverContext Context
{
get
{
Contract.Ensures(Contract.Result<ProverContext>() != null);
return ctx;
}
}
private readonly TypeAxiomBuilder AxBuilder;
private readonly UniqueNamer Namer;
private readonly TypeDeclCollector DeclCollector;
private void FeedTypeDeclsToProver()
{
foreach (string s in DeclCollector.GetNewDeclarations()) {
Contract.Assert(s != null);
AddTypeDecl(s);
}
}
public override void BeginCheck(string descriptiveName, VCExpr vc, ErrorHandler handler)
{
//Contract.Requires(descriptiveName != null);
//Contract.Requires(vc != null);
//Contract.Requires(handler != null);
TextWriter output = OpenOutputFile(descriptiveName);
Contract.Assert(output != null);
WriteLineAndLog(output, "%------------------------------------------------------------------------------");
WriteLineAndLog(output, "% Boogie benchmark: " + descriptiveName);
WriteLineAndLog(output, "%------------------------------------------------------------------------------");
WriteLineAndLog(output, _backgroundPredicates);
if (!AxiomsAreSetup) {
AddAxiom(VCExpr2String(ctx.Axioms, -1));
AxiomsAreSetup = true;
}
string vcString = "fof(vc, conjecture, " + VCExpr2String(vc, 1) + ").";
foreach (string s in TypeDecls) {
Contract.Assert(s != null);
WriteLineAndLog(output, s);
}
int id = 0;
foreach (string s in Axioms) {
Contract.Assert(s != null);
WriteLineAndLog(output, "fof(ax" + id++ + ", axiom,");
WriteLineAndLog(output, s);
WriteLineAndLog(output, ").");
}
WriteLineAndLog(output, vcString);
output.Close();
}
public TPTPProverOptions Options
{
get { return (TPTPProverOptions)this.options; }
}
private TextWriter OpenOutputFile(string descriptiveName)
{
Contract.Requires(descriptiveName != null);
Contract.Ensures(Contract.Result<TextWriter>() != null);
string filename = Options.Output;
filename = Helpers.SubstituteAtPROC(descriptiveName, cce.NonNull(filename));
return new StreamWriter(filename, false);
}
private void WriteLineAndLog(TextWriter output, string msg)
{
Contract.Requires(output != null);
Contract.Requires(msg != null);
LogActivity(msg);
output.WriteLine(msg);
}
[NoDefaultContract]
public override Outcome CheckOutcome(ErrorHandler handler)
{ //Contract.Requires(handler != null);
Contract.EnsuresOnThrow<UnexpectedProverOutputException>(true);
return Outcome.Undetermined;
}
protected string VCExpr2String(VCExpr expr, int polarity)
{
Contract.Requires(expr != null);
Contract.Ensures(Contract.Result<string>() != null);
DateTime start = DateTime.UtcNow;
if (CommandLineOptions.Clo.Trace)
Console.Write("Linearising ... ");
// handle the types in the VCExpr
TypeEraser eraser;
switch (CommandLineOptions.Clo.TypeEncodingMethod) {
case CommandLineOptions.TypeEncoding.Arguments:
eraser = new TypeEraserArguments((TypeAxiomBuilderArguments)AxBuilder, gen);
break;
case CommandLineOptions.TypeEncoding.Monomorphic:
eraser = null;
break;
default:
eraser = new TypeEraserPremisses((TypeAxiomBuilderPremisses)AxBuilder, gen);
break;
}
VCExpr exprWithoutTypes = eraser == null ? expr : eraser.Erase(expr, polarity);
Contract.Assert(exprWithoutTypes != null);
var letImplier = new Let2ImpliesMutator(Gen);
var flattener = new TermFormulaFlattener(Gen);
var exprWithLet = flattener.Flatten(exprWithoutTypes);
var exprWithoutLet = letImplier.Mutate(exprWithLet);
var axiomsWithLet = flattener.Flatten(AxBuilder.GetNewAxioms());
var axiomsWithoutLet = letImplier.Mutate(axiomsWithLet);
DeclCollector.Collect(axiomsWithoutLet);
DeclCollector.Collect(exprWithoutLet);
FeedTypeDeclsToProver();
AddAxiom(TPTPExprLineariser.ToString(axiomsWithoutLet, Namer, Options));
string res = TPTPExprLineariser.ToString(exprWithoutLet, Namer, Options);
Contract.Assert(res != null);
if (CommandLineOptions.Clo.Trace) {
DateTime end = DateTime.UtcNow;
TimeSpan elapsed = end - start;
Console.WriteLine("finished [{0} s]", elapsed.TotalSeconds);
}
return res;
}
// the list of all known axioms, where have to be included in each
// verification condition
private readonly List<string/*!>!*/> Axioms = new List<string/*!*/>();
private bool AxiomsAreSetup = false;
// similarly, a list of function/predicate declarations
private readonly List<string/*!>!*/> TypeDecls = new List<string/*!*/>();
protected void AddAxiom(string axiom)
{
Contract.Requires(axiom != null);
Axioms.Add(axiom);
// if (thmProver != null) {
// LogActivity(":assume " + axiom);
// thmProver.AddAxioms(axiom);
// }
}
protected void AddTypeDecl(string decl)
{
Contract.Requires(decl != null);
TypeDecls.Add(decl);
// if (thmProver != null) {
// LogActivity(decl);
// thmProver.Feed(decl, 0);
// }
}
////////////////////////////////////////////////////////////////////////////
private static string _backgroundPredicates = "";
static void InitializeGlobalInformation(string backgroundPred)
{
Contract.Requires(backgroundPred != null);
Contract.Ensures(_backgroundPredicates != null);
//throws ProverException, System.IO.FileNotFoundException;
if (_backgroundPredicates == null) {
string codebaseString =
cce.NonNull(Path.GetDirectoryName(cce.NonNull(System.Reflection.Assembly.GetExecutingAssembly().Location)));
// Initialize '_backgroundPredicates'
string univBackPredPath = Path.Combine(codebaseString, backgroundPred);
using (StreamReader reader = new System.IO.StreamReader(univBackPredPath)) {
_backgroundPredicates = reader.ReadToEnd();
}
}
}
}
public class Factory : ProverFactory
{
public override object SpawnProver(ProverOptions options, object ctxt)
{
//Contract.Requires(ctxt != null);
//Contract.Requires(options != null);
Contract.Ensures(Contract.Result<object>() != null);
return this.SpawnProver(options,
cce.NonNull((DeclFreeProverContext)ctxt).ExprGen,
cce.NonNull((DeclFreeProverContext)ctxt));
}
public override object NewProverContext(ProverOptions options)
{
//Contract.Requires(options != null);
Contract.Ensures(Contract.Result<object>() != null);
if (CommandLineOptions.Clo.BracketIdsInVC < 0) {
CommandLineOptions.Clo.BracketIdsInVC = 0;
}
VCExpressionGenerator gen = new VCExpressionGenerator();
List<string>/*!>!*/ proverCommands = new List<string/*!*/>();
proverCommands.Add("tptp");
proverCommands.Add("external");
VCGenerationOptions genOptions = new VCGenerationOptions(proverCommands);
Contract.Assert(genOptions != null);
return new DeclFreeProverContext(gen, genOptions);
}
public override ProverOptions BlankProverOptions()
{
return new TPTPProverOptions();
}
protected virtual TPTPProcessTheoremProver SpawnProver(ProverOptions options,
VCExpressionGenerator gen,
DeclFreeProverContext ctx)
{
Contract.Requires(options != null);
Contract.Requires(gen != null);
Contract.Requires(ctx != null);
Contract.Ensures(Contract.Result<TPTPProcessTheoremProver>() != null);
return new TPTPProcessTheoremProver(options, gen, ctx);
}
}
}
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