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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using Microsoft.Boogie.VCExprAST;
namespace Microsoft.Boogie.SMTLib
{
// Visitor for collecting the occurring function symbols in a VCExpr,
// and for creating the corresponding declarations
public class TypeDeclCollector : BoundVarTraversingVCExprVisitor<bool, bool> {
private readonly UniqueNamer Namer;
[ContractInvariantMethod]
void ObjectInvariant()
{
Contract.Invariant(Namer!=null);
Contract.Invariant(AllDecls != null);
Contract.Invariant(IncDecls != null);
Contract.Invariant(KnownFunctions != null);
Contract.Invariant(KnownVariables != null);
}
public TypeDeclCollector(UniqueNamer namer) {
Contract.Requires(namer != null);
this.Namer = namer;
}
// not used
protected override bool StandardResult(VCExpr node, bool arg) {
Contract.Requires(node != null);
return true;
}
private readonly List<string/*!>!*/> AllDecls = new List<string/*!*/> ();
private readonly List<string/*!>!*/> IncDecls = new List<string/*!*/> ();
private readonly IDictionary<Function/*!*/, bool>/*!*/ KnownFunctions =
new Dictionary<Function/*!*/, bool> ();
private readonly IDictionary<VCExprVar/*!*/, bool>/*!*/ KnownVariables =
new Dictionary<VCExprVar/*!*/, bool> ();
public List<string/*!>!*/> AllDeclarations { get {
Contract.Ensures(cce.NonNullElements(Contract.Result<List<string>>() ));
List<string>/*!>!*/ res = new List<string/*!*/> ();
res.AddRange(AllDecls);
return res;
} }
public List<string/*!>!*/> GetNewDeclarations() {
Contract.Ensures(cce.NonNullElements(Contract.Result<List<string>>() ));
List<string>/*!>!*/ res = new List<string/*!*/>();
res.AddRange(IncDecls);
IncDecls.Clear();
return res;
}
private void AddDeclaration(string decl) {
Contract.Requires(decl != null);
AllDecls.Add(decl);
IncDecls.Add(decl);
}
public void Collect(VCExpr expr) {
Contract.Requires(expr != null);
Traverse(expr, true);
}
///////////////////////////////////////////////////////////////////////////
private static string TypeToString(Type t) {
Contract.Requires(t != null);
Contract.Ensures(Contract.Result<string>() != null);
return SMTLibExprLineariser.TypeToString(t);
}
public override bool Visit(VCExprNAry node, bool arg) {
Contract.Requires(node != null);
// there are a couple of cases where operators have to be
// registered by generating appropriate statements
VCExprBoogieFunctionOp op = node.Op as VCExprBoogieFunctionOp;
if (op != null && !KnownFunctions.ContainsKey(op.Func)) {
Function f = op.Func;
Contract.Assert(f!=null);
string printedName = Namer.GetName(f, SMTLibExprLineariser.MakeIdPrintable(f.Name));
Contract.Assert(printedName!=null);
string decl = ":extrafuns ((" + printedName;
foreach (Variable v in f.InParams) {
Contract.Assert(v!=null);
decl += " " + TypeToString(v.TypedIdent.Type);
}
Contract.Assert(f.OutParams.Length == 1);
foreach (Variable v in f.OutParams) {
Contract.Assert(v!=null);
decl += " " + TypeToString(v.TypedIdent.Type);
}
decl += "))";
AddDeclaration(decl);
KnownFunctions.Add(f, true);
}
return base.Visit(node, arg);
}
public override bool Visit(VCExprVar node, bool arg) {
Contract.Requires(node != null);
if (!BoundTermVars.Contains(node) && !KnownVariables.ContainsKey(node)) {
string printedName = Namer.GetName(node, SMTLibExprLineariser.MakeIdPrintable(node.Name));
Contract.Assert(printedName!=null);
string decl =
":extrafuns ((" + printedName + " " + TypeToString(node.Type) + "))";
AddDeclaration(decl);
KnownVariables.Add(node, true);
}
return base.Visit(node, arg);
}
}
}
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