private void AnalyseLocalAccessesInRegion(InstrumentationRegion region)
{
foreach (var block in region.Implementation().Blocks)
{
for (int idx = 0; idx < block.Cmds.Count; idx++)
{
if (!(block.Cmds[idx] is CallCmd))
{
continue;
}
var call = block.Cmds[idx] as CallCmd;
bool isInstrumentedCall = false;
string resource = null;
string accessType = null;
if (idx + 1 < block.Cmds.Count && block.Cmds[idx + 1] is AssumeCmd)
{
isInstrumentedCall = QKeyValue.FindStringAttribute((block.Cmds[idx + 1]
as AssumeCmd).Attributes, "captureState") != null;
resource = QKeyValue.FindStringAttribute((block.Cmds[idx + 1]
as AssumeCmd).Attributes, "resource");
accessType = QKeyValue.FindStringAttribute((block.Cmds[idx + 1]
as AssumeCmd).Attributes, "access");
}
if (isInstrumentedCall && resource != null && accessType != null)
{
if ((this.EP.ForceWriteResource.Contains(resource) && accessType.Equals("write")) ||
(this.EP.ForceReadResource.Contains(resource) && accessType.Equals("read")))
{
continue;
}
if (call.Ins.Count == 0)
{
region.TryAddLocalResourceAccess(resource, new LiteralExpr(Token.NoToken, BigNum.FromInt(0)));
continue;
}
HashSet <Expr> ptrExprs = null;
var result = this.PtrAnalysisCache[region].TryComputeRootPointers(call.Ins[0], out ptrExprs);
foreach (var ptrExpr in ptrExprs)
{
var id = this.PtrAnalysisCache[region].GetIdentifier(ptrExpr);
if (result == PointerArithmeticAnalyser.ResultType.Const)
{
region.TryAddLocalResourceAccess(resource, ptrExpr);
}
else if (!WhoopCommandLineOptions.Get().CheckInParamAliasing&&
region.FunctionPointers.Any(val => val.Name.Equals(id.Name)))
{
call.callee = "_NO_OP_$" + this.EP.Name;
call.Ins.Clear();
call.Outs.Clear();
}
else if (this.PtrAnalysisCache[region].IsAxiom(id))
{
if (!this.AC.AxiomAccessesMap.ContainsKey(resource))
{
this.AC.AxiomAccessesMap.Add(resource, new HashSet <Expr>());
}
if (!this.AC.AxiomAccessesMap[resource].Any(val =>
val.ToString().Equals(ptrExpr.ToString())))
{
this.AC.AxiomAccessesMap[resource].Add(ptrExpr);
}
region.TryAddLocalResourceAccess(resource, ptrExpr);
}
else
{
region.TryAddLocalResourceAccess(resource, ptrExpr);
}
}
if (ptrExprs.Count == 0 && accessType.Equals("write"))
{
this.EP.ForceWriteResource.Add(resource);
}
else if (ptrExprs.Count == 0 && accessType.Equals("read"))
{
this.EP.ForceReadResource.Add(resource);
}
}
}
}
}