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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Microsoft.Contracts;
using Microsoft.Boogie.VCExprAST;
namespace Microsoft.Boogie
{
/// <summary>
/// The methods of this class are called in the following order:
/// DeclareType*
/// (DeclareConstant DeclareFunction)*
/// AddAxiom*
/// DeclareGlobalVariable*
/// At this time, all "attributes" are passed in as null.
/// </summary>
public abstract class ProverContext : ICloneable {
protected virtual void ProcessDeclaration(Declaration! decl) {}
public virtual void DeclareType(TypeCtorDecl! t, string attributes) { ProcessDeclaration(t); }
public virtual void DeclareConstant(Constant! c, bool uniq, string attributes) { ProcessDeclaration(c); }
public virtual void DeclareFunction(Function! f, string attributes) { ProcessDeclaration(f); }
public virtual void AddAxiom(Axiom! a, string attributes) { ProcessDeclaration(a); }
public abstract void AddAxiom(VCExpr! vc);
public virtual void DeclareGlobalVariable(GlobalVariable! v, string attributes) { ProcessDeclaration(v); }
public abstract VCExpressionGenerator! ExprGen { get; }
public abstract Boogie2VCExprTranslator! BoogieExprTranslator { get; }
public abstract VCGenerationOptions! VCGenOptions { get; }
public abstract object! Clone();
}
// -----------------------------------------------------------------------------------------------
// -----------------------------------------------------------------------------------------------
// -----------------------------------------------------------------------------------------------
/// <summary>
/// This ProverContext subclass is intended for use with untyped provers that do not require names
/// to be declared before use. It constructs its context from unique constants and given axioms.
/// </summary>
public class DeclFreeProverContext : ProverContext {
protected VCExpressionGenerator! gen;
protected VCGenerationOptions! genOptions;
protected Boogie2VCExprTranslator! translator;
protected OrderingAxiomBuilder! orderingAxiomBuilder;
StringBuilder! proverCommands;
StringBuilder! incrementalProverCommands;
protected List<Variable!>! distincts;
protected List<VCExpr!>! axiomConjuncts;
public VCExprTranslator exprTranslator;
public DeclFreeProverContext(VCExpressionGenerator! gen,
VCGenerationOptions! genOptions) {
this.gen = gen;
this.genOptions = genOptions;
Boogie2VCExprTranslator! t = new Boogie2VCExprTranslator (gen, genOptions);
this.translator = t;
OrderingAxiomBuilder! oab = new OrderingAxiomBuilder(gen, t);
oab.Setup();
this.orderingAxiomBuilder = oab;
proverCommands = new StringBuilder();
incrementalProverCommands = new StringBuilder();
distincts = new List<Variable!>();
axiomConjuncts = new List<VCExpr!>();
exprTranslator = null;
}
private DeclFreeProverContext(DeclFreeProverContext! ctxt) {
this.gen = ctxt.gen;
this.genOptions = ctxt.genOptions;
Boogie2VCExprTranslator! t = (Boogie2VCExprTranslator)ctxt.translator.Clone();
this.translator = t;
this.orderingAxiomBuilder = new OrderingAxiomBuilder(ctxt.gen, t, ctxt.orderingAxiomBuilder);
StringBuilder! cmds = new StringBuilder ();
cmds.Append(ctxt.proverCommands);
proverCommands = cmds;
StringBuilder! incCmds = new StringBuilder ();
incCmds.Append(ctxt.incrementalProverCommands);
incrementalProverCommands = incCmds;
distincts = new List<Variable!>(ctxt.distincts);
axiomConjuncts = new List<VCExpr!>(ctxt.axiomConjuncts);
if (ctxt.exprTranslator == null)
exprTranslator = null;
else
exprTranslator = (VCExprTranslator!)ctxt.exprTranslator.Clone();
}
public override object! Clone() {
return new DeclFreeProverContext(this);
}
internal protected void SayToProver(string! msg)
{
msg = msg + "\r\n";
proverCommands.Append(msg);
incrementalProverCommands.Append(msg);
}
protected override void ProcessDeclaration(Declaration! decl)
{
for (QKeyValue a = decl.Attributes; a != null; a = a.Next) {
if (a.Key == "prover" && a.Params.Count == 1) {
string cmd = a.Params[0] as string;
if (cmd != null) {
int pos = cmd.IndexOf(':');
if (pos <= 0)
throw new ProverException("Invalid syntax of :prover string: `" + cmd + "'");
string kind = cmd.Substring(0, pos);
if (genOptions.IsAnyProverCommandSupported(kind))
SayToProver(cmd.Substring(pos + 1));
}
}
}
}
public override void DeclareFunction(Function! f, string attributes) {
base.ProcessDeclaration(f);
}
public override void DeclareConstant(Constant! c, bool uniq, string attributes) {
base.DeclareConstant(c, uniq, attributes);
orderingAxiomBuilder.AddConstant(c);
// TODO: make separate distinct lists for names coming from different types
// e.g., one for strings, one for ints, one for program types.
if (uniq){
distincts.Add(c);
}
}
public override void AddAxiom(Axiom! ax, string attributes) {
base.AddAxiom(ax, attributes);
string ignore = ax.FindStringAttribute("ignore");
if (ignore != null && genOptions.IsAnyProverCommandSupported(ignore)) {
return;
}
axiomConjuncts.Add(translator.Translate(ax.Expr));
}
public override void AddAxiom(VCExpr! vc)
{
axiomConjuncts.Add(vc);
}
public VCExpr! Axioms {
get {
VCExpr axioms = gen.NAry(VCExpressionGenerator.AndOp, axiomConjuncts);
List<VCExpr!>! distinctVars = new List<VCExpr!> ();
foreach (Variable! v in distincts)
distinctVars.Add(translator.LookupVariable(v));
axioms = gen.AndSimp(gen.Distinct(distinctVars), axioms);
if (CommandLineOptions.Clo.TypeEncodingMethod != CommandLineOptions.TypeEncoding.Monomorphic)
axioms = gen.AndSimp(orderingAxiomBuilder.Axioms, axioms);
return axioms;
}
}
public string! GetProverCommands(bool full) {
string! res = (full ? proverCommands : incrementalProverCommands).ToString();
incrementalProverCommands.Length = 0;
return res;
}
public override VCExpressionGenerator! ExprGen { get {
return gen;
} }
public override Boogie2VCExprTranslator! BoogieExprTranslator { get {
return translator;
} }
public override VCGenerationOptions! VCGenOptions { get {
return genOptions;
} }
}
// Translator from VCExpressions to strings, which are implemented
// by the various provers
public abstract class VCExprTranslator : ICloneable {
public abstract string! translate(VCExpr! expr, int polarity);
public abstract Object! Clone();
}
}
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