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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using Microsoft.Boogie;
using Microsoft.Basetypes;
namespace GPUVerify
{
class WriteCollector : AccessCollector
{
private AccessRecord access = null;
public WriteCollector(INonLocalState NonLocalState)
: base(NonLocalState)
{
}
public override AssignLhs VisitSimpleAssignLhs(SimpleAssignLhs node)
{
Debug.Assert(NoWrittenVariable());
if (NonLocalState.Contains(node.DeepAssignedVariable))
{
access = new AccessRecord(node.DeepAssignedVariable, null, null, null);
}
return node;
}
private bool NoWrittenVariable()
{
return access == null;
}
public override AssignLhs VisitMapAssignLhs(MapAssignLhs node)
{
Debug.Assert(NoWrittenVariable());
if (!NonLocalState.Contains(node.DeepAssignedVariable))
{
return node;
}
Variable WrittenVariable = node.DeepAssignedVariable;
MapAssignLhs MapAssignX = node;
CheckMapIndex(MapAssignX);
Expr IndexX = MapAssignX.Indexes[0];
Expr IndexY = null;
Expr IndexZ = null;
if (MapAssignX.Map is MapAssignLhs)
{
MapAssignLhs MapAssignY = MapAssignX.Map as MapAssignLhs;
CheckMapIndex(MapAssignY);
IndexY = MapAssignY.Indexes[0];
if (MapAssignY.Map is MapAssignLhs)
{
MapAssignLhs MapAssignZ = MapAssignY.Map as MapAssignLhs;
CheckMapIndex(MapAssignZ);
IndexZ = MapAssignZ.Indexes[0];
if (!(MapAssignZ.Map is SimpleAssignLhs))
{
Console.WriteLine("*** Error - maps with more than three levels of nesting are not supported");
Environment.Exit(1);
}
}
else
{
Debug.Assert(MapAssignY.Map is SimpleAssignLhs);
}
}
else
{
Debug.Assert(MapAssignX.Map is SimpleAssignLhs);
}
access = new AccessRecord(WrittenVariable, IndexZ, IndexY, IndexX);
return MapAssignX;
}
private void CheckMapIndex(MapAssignLhs node)
{
if (node.Indexes.Count > 1)
{
MultiDimensionalMapError();
}
}
internal bool FoundWrite()
{
return access != null;
}
internal AccessRecord GetAccess()
{
return access;
}
}
}
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