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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using System.IO;
using ExternalProver;
using System.Diagnostics;
using Microsoft.Contracts;
using Microsoft.Boogie.AbstractInterpretation;
using Microsoft.Boogie;
using Microsoft.Boogie.VCExprAST;
using Microsoft.Boogie.Clustering;
using Microsoft.Boogie.TypeErasure;
using Microsoft.Boogie.Simplify;
namespace Microsoft.Boogie.SMTLib
{
public class SMTLibProcessTheoremProver : LogProverInterface
{
private readonly DeclFreeProverContext! ctx;
[NotDelayed]
public SMTLibProcessTheoremProver(ProverOptions! options, VCExpressionGenerator! gen,
DeclFreeProverContext! ctx)
{
InitializeGlobalInformation("UnivBackPred2.smt");
this.ctx = ctx;
TypeAxiomBuilder! axBuilder;
switch (CommandLineOptions.Clo.TypeEncodingMethod) {
case CommandLineOptions.TypeEncoding.Arguments:
axBuilder = new TypeAxiomBuilderArguments (gen);
break;
default:
axBuilder = new TypeAxiomBuilderPremisses (gen);
break;
}
axBuilder.Setup();
AxBuilder = axBuilder;
UniqueNamer namer = new UniqueNamer ();
Namer = namer;
this.DeclCollector = new TypeDeclCollector (namer);
base(options, "", "", "", "", gen);
}
public override ProverContext! Context { get {
return ctx;
} }
private readonly TypeAxiomBuilder! AxBuilder;
private readonly UniqueNamer! Namer;
private readonly TypeDeclCollector! DeclCollector;
private void FeedTypeDeclsToProver() {
foreach (string! s in DeclCollector.GetNewDeclarations())
AddTypeDecl(s);
}
public override void BeginCheck(string! descriptiveName, VCExpr! vc, ErrorHandler! handler) {
TextWriter! output = OpenOutputFile(descriptiveName);
string! name =
MakeBenchmarkNameSafe(SMTLibExprLineariser.MakeIdPrintable(descriptiveName));
WriteLineAndLog(output, "(benchmark " + name);
WriteLineAndLog(output, _backgroundPredicates);
if (!AxiomsAreSetup) {
AddAxiom(VCExpr2String(ctx.Axioms, -1));
AxiomsAreSetup = true;
}
string vcString = ":formula (not " + VCExpr2String(vc, 1) + ")";
string! prelude = ctx.GetProverCommands(true);
WriteLineAndLog(output, prelude);
foreach (string! s in TypeDecls) {
WriteLineAndLog(output, s);
}
foreach (string! s in Axioms) {
WriteLineAndLog(output, ":assumption");
WriteLineAndLog(output, s);
}
WriteLineAndLog(output, vcString);
WriteLineAndLog(output, ")");
output.Close();
}
// certain words that should not occur in the name of a benchmark
// because some solvers don't like them
private readonly static List<string!>! BadBenchmarkWords = new List<string!> ();
static SMTLibProcessTheoremProver() {
BadBenchmarkWords.Add("Array"); BadBenchmarkWords.Add("Arrray");
}
private string! MakeBenchmarkNameSafe(string! name) {
for (int i = 0; i < BadBenchmarkWords.Count; i = i + 2)
name = name.Replace(BadBenchmarkWords[i], BadBenchmarkWords[i+1]);
return name;
}
private TextWriter! OpenOutputFile(string! descriptiveName) {
string filename = CommandLineOptions.Clo.SMTLibOutputPath;
filename = Helpers.SubstituteAtPROC(descriptiveName, (!)filename);
return new StreamWriter(filename, false);
}
private void WriteLineAndLog(TextWriter! output, string! msg) {
LogActivity(msg);
output.WriteLine(msg);
}
[NoDefaultContract]
public override Outcome CheckOutcome(ErrorHandler! handler)
throws UnexpectedProverOutputException; {
return Outcome.Undetermined;
}
protected string! VCExpr2String(VCExpr! expr, int polarity) {
DateTime start = DateTime.Now;
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;
default:
eraser = new TypeEraserPremisses((TypeAxiomBuilderPremisses)AxBuilder, gen);
break;
}
VCExpr! exprWithoutTypes = eraser.Erase(expr, polarity);
LetBindingSorter! letSorter = new LetBindingSorter(gen);
VCExpr! sortedExpr = letSorter.Mutate(exprWithoutTypes, true);
VCExpr! sortedAxioms = letSorter.Mutate(AxBuilder.GetNewAxioms(), true);
DeclCollector.Collect(sortedAxioms);
DeclCollector.Collect(sortedExpr);
FeedTypeDeclsToProver();
AddAxiom(SMTLibExprLineariser.ToString(sortedAxioms, Namer));
string! res = SMTLibExprLineariser.ToString(sortedExpr, Namer);
if (CommandLineOptions.Clo.Trace) {
DateTime end = DateTime.Now;
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) {
Axioms.Add(axiom);
// if (thmProver != null) {
// LogActivity(":assume " + axiom);
// thmProver.AddAxioms(axiom);
// }
}
protected void AddTypeDecl(string! decl) {
TypeDecls.Add(decl);
// if (thmProver != null) {
// LogActivity(decl);
// thmProver.Feed(decl, 0);
// }
}
////////////////////////////////////////////////////////////////////////////
private static string! _backgroundPredicates;
static void InitializeGlobalInformation(string! backgroundPred)
ensures _backgroundPredicates != null;
//throws ProverException, System.IO.FileNotFoundException;
{
if (_backgroundPredicates == null) {
string! codebaseString =
(!) Path.GetDirectoryName((!)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)
{
return this.SpawnProver(options,
((DeclFreeProverContext!)ctxt).ExprGen,
(DeclFreeProverContext!)ctxt);
}
public override object! NewProverContext(ProverOptions! options) {
if (CommandLineOptions.Clo.BracketIdsInVC < 0) {
CommandLineOptions.Clo.BracketIdsInVC = 0;
}
VCExpressionGenerator! gen = new VCExpressionGenerator ();
List<string!>! proverCommands = new List<string!> ();
// TODO: what is supported?
// proverCommands.Add("all");
// proverCommands.Add("simplify");
// proverCommands.Add("simplifyLike");
VCGenerationOptions! genOptions = new VCGenerationOptions(proverCommands);
return new DeclFreeProverContext(gen, genOptions);
}
protected virtual SMTLibProcessTheoremProver! SpawnProver(ProverOptions! options,
VCExpressionGenerator! gen,
DeclFreeProverContext! ctx) {
return new SMTLibProcessTheoremProver(options, gen, ctx);
}
}
}
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