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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 NonLocalAccessExtractor : StandardVisitor
{
private int TempId;
public AssignCmd Assignment = null;
public LocalVariable Declaration = null;
public bool done = false;
private INonLocalState NonLocalState;
public NonLocalAccessExtractor(int TempId, INonLocalState NonLocalState)
{
this.TempId = TempId;
this.NonLocalState = NonLocalState;
}
public override Expr VisitNAryExpr(NAryExpr node)
{
if (done)
{
return node;
}
if (!NonLocalAccessCollector.IsNonLocalAccess(node, NonLocalState))
{
return base.VisitNAryExpr(node);
}
Expr temp = node;
while (temp is NAryExpr && (temp as NAryExpr).Fun is MapSelect)
{
Debug.Assert((temp as NAryExpr).Args.Length == 2);
if (NonLocalAccessCollector.ContainsNonLocalAccess((temp as NAryExpr).Args[1], NonLocalState))
{
return VisitExpr((temp as NAryExpr).Args[1]);
}
temp = (temp as NAryExpr).Args[0];
}
// If we get here, we've established that the node contains no non-local accessing sub-expressions
Debug.Assert(temp is IdentifierExpr);
done = true;
Declaration = new LocalVariable(node.tok, new TypedIdent(node.tok, "_temp" + TempId, node.Type));
SimpleAssignLhs lhs = new SimpleAssignLhs(node.tok, new IdentifierExpr(node.tok, Declaration));
Expr rhs = node;
List<AssignLhs> lhss = new List<AssignLhs>();
lhss.Add(lhs);
List<Expr> rhss = new List<Expr>();
rhss.Add(rhs);
Assignment = new AssignCmd(node.tok, lhss, rhss);
return new IdentifierExpr(node.tok, Declaration);
}
public override Expr VisitIdentifierExpr(IdentifierExpr node)
{
if (done)
{
return node;
}
if (NonLocalAccessCollector.IsNonLocalAccess(node, NonLocalState))
{
done = true;
Declaration = new LocalVariable(node.tok, new TypedIdent(node.tok, "_temp" + TempId, node.Decl.TypedIdent.Type));
SimpleAssignLhs lhs = new SimpleAssignLhs(node.tok, new IdentifierExpr(node.tok, Declaration));
Expr rhs = node;
List<AssignLhs> lhss = new List<AssignLhs>();
lhss.Add(lhs);
List<Expr> rhss = new List<Expr>();
rhss.Add(rhs);
Assignment = new AssignCmd(node.tok, lhss, rhss);
return new IdentifierExpr(node.tok, Declaration);
}
return base.VisitIdentifierExpr(node);
}
}
}
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