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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Boogie;
using System.Diagnostics;
namespace GPUVerify
{
class NonLocalAccessCollector : StandardVisitor
{
public HashSet<Expr> Accesses = new HashSet<Expr>();
private IKernelArrayInfo NonLocalState;
public NonLocalAccessCollector(IKernelArrayInfo NonLocalState)
{
this.NonLocalState = NonLocalState;
}
public static bool IsNonLocalAccess(Expr n, IKernelArrayInfo NonLocalState)
{
if (n is NAryExpr)
{
NAryExpr node = n as NAryExpr;
if (node.Fun is MapSelect)
{
Expr temp = node;
while (temp is NAryExpr && (temp as NAryExpr).Fun is MapSelect)
{
temp = (temp as NAryExpr).Args[0];
}
Debug.Assert(temp is IdentifierExpr);
Variable v = (temp as IdentifierExpr).Decl;
return (NonLocalState.Contains(v));
}
}
if (n is IdentifierExpr)
{
IdentifierExpr node = n as IdentifierExpr;
return NonLocalState.Contains(node.Decl);
}
return false;
}
public static bool ContainsNonLocalAccess(AssignLhs lhs, IKernelArrayInfo NonLocalState)
{
NonLocalAccessCollector collector = new NonLocalAccessCollector(NonLocalState);
if (lhs is SimpleAssignLhs)
{
collector.VisitSimpleAssignLhs(lhs as SimpleAssignLhs);
}
else
{
Debug.Assert(lhs is MapAssignLhs);
collector.VisitMapAssignLhs(lhs as MapAssignLhs);
}
return collector.Accesses.Count > 0;
}
public static bool ContainsNonLocalAccess(Expr rhs, IKernelArrayInfo NonLocalState)
{
NonLocalAccessCollector collector = new NonLocalAccessCollector(NonLocalState);
collector.VisitExpr(rhs);
return collector.Accesses.Count > 0;
}
public override Expr VisitNAryExpr(NAryExpr node)
{
if (IsNonLocalAccess(node, NonLocalState))
{
Accesses.Add(node);
return node;
}
return base.VisitNAryExpr(node);
}
public override Expr VisitIdentifierExpr(IdentifierExpr node)
{
if (IsNonLocalAccess(node, NonLocalState))
{
Accesses.Add(node);
return node;
}
return base.VisitIdentifierExpr(node);
}
}
}
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