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using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using System.IO;
using System.Diagnostics;
using Microsoft.Contracts;
using Microsoft.Boogie.AbstractInterpretation;
using Microsoft.Boogie;
using Microsoft.Boogie.Z3;
using Microsoft.Z3;
using Microsoft.Boogie.VCExprAST;
using TypeAst = System.IntPtr;
using TermAst = System.IntPtr;
using ConstDeclAst = System.IntPtr;
using ConstAst = System.IntPtr;
using Value = System.IntPtr;
using PatternAst = System.IntPtr;
namespace Microsoft.Boogie.Z3
{
public class Z3ThreadTheoremProver : ProverInterface
{
protected DeclFreeProverContext ctx;
protected VCExpressionGenerator gen;
public override ProverContext Context
{
get { return this.ctx; }
}
public override VCExpressionGenerator VCExprGen
{
get { return this.gen; }
}
private int timeout;
private Z3Context cm;
public Z3ThreadTheoremProver(Z3InstanceOptions proverOptions)
: base()
{
gen = new VCExpressionGenerator();
string codebaseString = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
string backgroundPredicates;
// Initialize '_backgroundPredicates'
string univBackPredPath = Path.Combine(codebaseString,
// yes, using .NeedsTypes here is an ugly hack...
"Z3API_UnivBackPred.smt");
using (StreamReader reader = new System.IO.StreamReader(univBackPredPath))
{
backgroundPredicates = reader.ReadToEnd();
}
Z3Config config = BuildConfig(timeout, true);
Z3Context cm = Z3ContextFactory.BuildZ3Context(config, gen);
Z3ThreadProverContext ctx = new Z3ThreadProverContext(gen, cm);
this.cm = cm;
cm.AddSmtlibString(backgroundPredicates);
this.z3ContextIsUsed = false;
}
private static Z3Config BuildConfig(int timeout, bool nativeBv)
{
Z3Config config = new Z3Config();
config.SetPartialModels(true);
config.SetModelCompletion(false);
config.SetHideUnusedPartitions(false);
config.SetModel(true);
if (0 <= CommandLineOptions.Clo.ProverCCLimit)
{
config.SetCounterExample(CommandLineOptions.Clo.ProverCCLimit);
}
if (0 <= timeout)
{
config.SetSoftTimeout(timeout.ToString());
}
config.SetTypeCheck(true);
if (nativeBv)
config.SetReflectBvOps(true);
return config;
}
private bool z3ContextIsUsed;
public void PushAxiom(VCExpr axiom)
{
cm.CreateBacktrackPoint();
cm.AddAxiom((VCExpr)axiom);
}
private void PushConjecture(VCExpr conjecture)
{
cm.CreateBacktrackPoint();
cm.AddConjecture((VCExpr)conjecture);
}
public void PrepareCheck(string descriptiveName, VCExpr vc)
{
PushAxiom(ctx.Axioms);
PushConjecture(vc);
}
public void BeginPreparedCheck()
{
outcome = Outcome.Undetermined;
outcome = cm.Check(out z3LabelModels);
}
public override void BeginCheck(string descriptiveName, VCExpr vc, ErrorHandler handler)
{
if (z3ContextIsUsed)
{
cm.Backtrack();
}
else
{
cm.AddAxiom((VCExpr)ctx.Axioms);
z3ContextIsUsed = true;
}
cm.CreateBacktrackPoint();
cm.AddConjecture((VCExpr)vc);
BeginPreparedCheck();
}
private Outcome outcome;
private List<Z3ErrorModelAndLabels> z3LabelModels = new List<Z3ErrorModelAndLabels>();
private UnexpectedProverOutputException proverException = null;
[NoDefaultContract]
public override Outcome CheckOutcome(ErrorHandler handler)
{
if (outcome == Outcome.Invalid)
{
foreach (Z3ErrorModelAndLabels z3LabelModel in z3LabelModels)
{
List<string> unprefixedLabels = RemovePreffixes(z3LabelModel.RelevantLabels);
handler.OnModel(unprefixedLabels, z3LabelModel.ErrorModel);
}
}
return outcome;
}
public void CreateBacktrackPoint()
{
cm.CreateBacktrackPoint();
}
override public void Pop()
{
cm.Backtrack();
}
private List<string> RemovePreffixes(List<string> labels)
{
List<string> result = new List<string>();
foreach (string label in labels)
{
if (label.StartsWith("+"))
{
result.Add(label.Substring(1));
}
else if (label.StartsWith("|"))
{
result.Add(label.Substring(1));
}
else if (label.StartsWith("@"))
{
result.Add(label.Substring(1));
}
else
throw new Exception("Unknown preffix in label " + label);
}
return result;
}
}
public class Z3ThreadProverContext : DeclFreeProverContext
{
private Z3Context cm;
public Z3ThreadProverContext(VCExpressionGenerator gen, Z3Context cm)
: base(gen, null)
{
this.cm = cm;
}
public override void DeclareType(TypeCtorDecl t, string attributes)
{
base.DeclareType(t, attributes);
cm.DeclareType(t.Name);
}
public override void DeclareConstant(Constant c, bool uniq, string attributes)
{
base.DeclareConstant(c, uniq, attributes);
cm.DeclareConstant(c.Name, c.TypedIdent.Type);
}
public override void DeclareFunction(Function f, string attributes)
{
base.DeclareFunction(f, attributes);
List<Type> domain = new List<Type>();
foreach (Variable v in f.InParams)
{
domain.Add(v.TypedIdent.Type);
}
if (f.OutParams.Length != 1)
throw new Exception("Cannot handle functions with " + f.OutParams + " out parameters.");
Type range = f.OutParams[0].TypedIdent.Type;
cm.DeclareFunction(f.Name, domain, range);
}
public override void DeclareGlobalVariable(GlobalVariable v, string attributes)
{
base.DeclareGlobalVariable(v, attributes);
cm.DeclareConstant(v.Name, v.TypedIdent.Type);
}
}
}
namespace Microsoft.Boogie.Z3api
{
public class Factory : ProverFactory
{
public override object SpawnProver(ProverOptions popts, object ctxt)
{
Z3InstanceOptions options = (Z3InstanceOptions) popts;
if (CommandLineOptions.Clo.BracketIdsInVC < 0)
{
CommandLineOptions.Clo.BracketIdsInVC = 0;
}
return new Z3ThreadTheoremProver(options);
}
public override object NewProverContext(ProverOptions options)
{
throw new NotImplementedException();
}
}
}
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